阅读说明：本技术 一种大坝坝体排水孔精度的控制方法 (Control method for dam body drain hole precision ) 是由 谢春鹏 路振刚 王永潭 张志福 刘茂军 刘亚莲 陈庆辉 王程鹏 房国君 黄财有 于 2021-07-16 设计创作，主要内容包括：一种大坝坝体排水孔精度的控制方法,按1％孔斜率作为临界值,将排水孔分为两类,即按1％孔斜率控制小于预留槽尺寸的排水孔、按1％孔斜率控制大于预留槽尺寸的排水孔,对这两类不同的孔分别采取不同的施工装置与精度控制措施,最终实现全部排水孔按1％孔斜率控制均落入预留槽内。通过钻进前、钻进过程中实施精度控制保证孔斜率1％下排水孔底部距离预留槽边尺寸均满足施工设计要求,并且钻进过程中对孔斜率的实时检测与纠偏,显著提高了施工质量；并且本发明提出的精度控制方法不仅适用于新打排水孔的施工,而且在坝体加固改造钻孔过程中控制孔斜率也有很好的效果。(A control method for dam body drain hole precision is characterized in that 1% hole slope is used as a critical value, the drain holes are divided into two types, namely the drain holes smaller than the size of a reserved groove are controlled according to the 1% hole slope, the drain holes larger than the size of the reserved groove are controlled according to the 1% hole slope, different construction devices and precision control measures are respectively adopted for the two types of different holes, and finally, all the drain holes fall into the reserved groove under the control of the 1% hole slope. The bottom of the drain hole with the hole slope of 1% is ensured to be away from the reserved groove edge to meet the construction design requirement by implementing precision control before drilling and in the drilling process, and the hole slope is detected and corrected in real time in the drilling process, so that the construction quality is obviously improved; the precision control method provided by the invention is not only suitable for the construction of newly-drilled drain holes, but also has a good effect of controlling the hole slope in the process of dam body reinforcing, reforming and drilling.)

1. A control method for the accuracy of a dam body drain hole is characterized in that,

the control method comprises the following steps:

step 1, measuring and lofting by using a total station, acquiring coordinates of a drain hole reserved groove, determining a drain hole arrangement interval based on the coordinates of the drain hole reserved groove, and determining drilling point position coordinates on a drain hole elevation surface;

step 2, calculating the coordinates of the bottom of the drain hole by taking the 1% hole inclination as a critical value based on the coordinates of the reserved groove of the drain hole and the coordinates of the drilling point position on the elevation surface of the drain hole, and dividing the drain hole into the drain hole with the size smaller than the reserved groove according to the 1% hole inclination and the drain hole with the size larger than the reserved groove according to the 1% hole inclination;

step 3, for the drain hole which is controlled to be smaller than the size of the reserved groove according to the hole inclination rate of 1%, drilling from the drilling point position on the elevation surface of the drain hole to the top down, and enabling the size of the bottom of the drain hole and the edge of the reserved groove to be not smaller than the minimum distance;

step 4, for the drain hole with the hole inclination rate of 1 percent controlled to be larger than the size of the reserved groove, drilling a drain hole straight hole section from the drilling point position on the drain hole opening elevation surface to the top down, wherein the hole depth of the straight hole section is 0.5-1 m smaller than the designed hole depth; collecting the hole bottom coordinates of the straight hole section and the hole bottom coordinates of the drain hole, and calculating the positions of the residual drain hole sections penetrating through the corridor; when the position penetrating the gallery is in the reserved groove, the drain hole is punched from top to bottom according to normal construction; and when the position penetrating through the gallery is outside the preformed groove, drilling a hole from bottom to top in the preformed groove and communicating with the bottom of the hole of the straight hole section.

2. The method for controlling the accuracy of the dam body drainage hole according to claim 1,

the step 1 comprises the following steps:

step 1.1, measuring and lofting by using a total station, measuring the outer contour of the formed drainage groove in the gallery, and making a measurement coordinate graph;

step 1.2, determining coordinates of the drain hole preformed groove according to the measurement coordinate graph, projecting the coordinates on a drain hole opening elevation surface, and checking the arrangement position of the drain hole preformed groove and the arrangement position of an embedded instrument;

step 1.3, carrying out moving treatment of avoiding a drain hole position on a drain hole outside the central line of the drain hole preformed groove and an embedded part inside the drain hole preformed groove;

step 1.4, determining the arrangement distance of the drain holes based on the coordinates of the drain hole preformed grooves, and determining the coordinates of drilling point positions on the elevation surface of the drain hole;

and step 1.5, uniformly numbering all the drain holes and performing measurement lofting.

3. The method for controlling the accuracy of the dam body drainage hole according to claim 1,

in the step 2, the 1% hole slope rate is controlled to be smaller than the drain hole with the size of the reserved groove, namely the size of the hole bottom and the edge of the reserved groove meets the requirement of minimum distance after considering the construction deviation of the hole bottom, the allowable deviation of the hole position of the hole and the influence of the hole radius when the drain hole has the 1% hole slope rate;

the 1% hole slope ratio is controlled to be larger than the drain hole with the size of the reserved groove, namely the size of the hole bottom and the edge of the reserved groove cannot meet the requirement of the minimum distance after considering the construction deviation of the hole bottom, the allowable deviation of the hole position of the opened hole and the influence of the hole radius when the drain hole has the 1% hole slope ratio.

4. The method for controlling the accuracy of the dam body drainage hole according to claim 3,

the minimum distance between the design hole bottom of the middle layer gallery and the size of the reserved groove edge is 45cm, and the minimum distance between the design hole bottom of the bottom layer gallery and the size of the reserved groove edge is 50 cm.

5. The method for controlling the accuracy of the dam body drainage hole according to claim 1,

the step 3 comprises the following steps:

step 3.1, based on the drilling point position coordinates determined in the step 1, performing hole position preliminary alignment after the drilling machine is in place; performing ground anchor fixing, horizontal direction correction and vertical direction correction on the drilling machine to enable a vertical shaft of the drilling machine to be vertical to a horizontal plane, and then accurately correcting hole positions, wherein the centers of drill bits coincide with drilling point positions;

step 3.2, before drilling, correcting the drill rod to ensure that the drill rod is vertical to the horizontal plane; in the drilling process, correcting once every time a drill rod is added;

step 3.3, the drilling process further comprises:

3.3.1, determining the relation between the drilling depth and the outer diameter of the guide drill rods and the number of the guide drill rods in the drilling process by using a test method;

3.3.2, detecting the fastening degree of a fastener of the drilling machine and the drilling direction of a drill rod of the anchoring drilling machine in real time in the drilling process;

3.3.3, in the drilling process, if a reinforced concrete section is met, immediately stopping drilling, pulling out the drill, replacing the diamond drill bit for drilling, and after the drill penetrates through the reinforced steel bar layer, replacing the conventional drill bit and recovering drilling;

and 3.3.4, measuring the hole slope in the drilling process and the drilling process of the final hole section, and controlling the drilling deviation within the construction allowable range by using an anti-deviation drilling tool.

6. The method for controlling the accuracy of the dam body drainage hole according to claim 5,

step 3, an anti-slant drilling tool is also adopted to control the hole slope;

the anti-slant drilling tool comprises: the device comprises a drilling machine limiting device, an orifice limiting device, a hard alloy centralizing block and a spiral drill rod;

the drilling machine power head moving foremost end and the orifice position are provided with limiting devices, and the drilling machine limiting devices and the orifice limiting devices are used for guiding and limiting the drilling tool when drilling holes and drilling shallow hole sections;

installing a hard alloy centering block on the drill rod, wherein the maximum outer diameter of the drill rod after the centering block is installed is smaller than the diameter of a drill hole; and welding the spiral sheet on the drill rod, wherein the maximum outer diameter of the welded drill rod is smaller than the diameter of the drilled hole.

7. The method for controlling the accuracy of the dam body drainage hole according to claim 1,

step 4 comprises the following steps:

step 4.1, drilling construction of the straight hole section of the drain hole is carried out according to the step 3;

step 4.2, acquiring the hole bottom coordinates of the straight hole section and the hole bottom coordinates of the drain hole by using a non-metal acoustic detector, and calculating the positions of the residual drain hole sections penetrating through the gallery;

4.3, when the position penetrating through the gallery is in the preformed groove, performing drilling construction of the residual drainage hole section according to the step 3;

and 4.4, drilling an upward hole at the bottom of the self-drainage hole when the position of the through gallery is outside the reserved groove until the through gallery is communicated with the bottom of the straight hole section.

8. The method for controlling the accuracy of the dam body drainage hole according to claim 7,

step 4.2 comprises:

step 4.2.1, arranging a columnar ultrasonic transducer at the bottom of the straight hole section of the drain hole and transmitting ultrasonic waves;

step 4.2.2, respectively placing 1 planar ultrasonic transducer at the top corners of two sides of the preformed groove of the drain hole of the gallery, and respectively placing 1 planar ultrasonic transducer at two sides of the position 40 degrees away from the top of the groove; coordinates (x) of 4 planar ultrasonic transducers_i,y,z_i) Are known, wherein i ═ 1,2,3, 4;

step 4.2.3, when the columnar ultrasonic transducers at the bottom of the straight hole section of the drain hole transmit ultrasonic waves, 4 planar ultrasonic transducers in the reserved groove of the drain hole are respectively at different moments t_iReceiving ultrasonic waves, wherein i is 1,2,3, 4;

step 4.2.4, obtaining coordinates (x, y, z) of the hole bottom and the wave velocity V of the concrete according to the following relational expression_p；

And 4.2.5, calculating the position coordinate of the drain hole penetrating through the reserved groove according to the orifice coordinate of the drain hole and the hole bottom coordinate of the straight hole section of the drain hole.

9. The method for controlling the accuracy of the dam body drainage hole according to claim 7,

step 4.4, a drilling platform is also erected at the position of the bottom of the drain hole; according to different operation elevation surfaces in the gallery, a flat straight section and a slope section are erected on the drilling platform.

Technical Field

The invention relates to the technical field of dam body drain hole construction, in particular to a dam body drain hole precision control method.

Background

In the comprehensive treatment project of the full hydropower station, a dam is built by utilizing the original full three-stage project, the power generation is mainly used, and the comprehensive utilization of flood control, irrigation, urban and industrial water supply, cultivation, tourism and the like is realized.

The plane position, the starting elevation, the stopping elevation and the like of the drain hole of the dam body all meet the construction technical requirements, namely the drain hole is required to be drilled into a reserved groove at the bottom of the hole; the minimum distance between the design hole bottom of the middle layer gallery and the edge of the reserved groove is 45cm, and the minimum distance between the design hole bottom of the bottom layer gallery and the edge of the reserved groove is 50 cm; each hole position is lofted by measurement, and the deviation between the planar perforated hole position and the designed hole position is not more than 5 cm; according to the technical requirements of water stopping and drainage, hole inclination measurement is carried out when the drainage hole is drilled, and the hole inclination requirement is not more than 1%. If the hole inclination of the drilling hole exceeds the specification, a deviation rectifying measure is taken in time.

At present, the existing dam body drain holes are 588 in total, and the total length is 18183.20 m. And calculating the hole slope through the size of the reserve tank, wherein 198 holes in the total hole number do not meet the design technical requirement, namely fall outside the reserve tank according to the hole slope of 1 percent and account for 33.67 percent of the total hole number. Therefore, all drain holes are ensured to fall into the reserve tank under the condition of ensuring the construction period and meeting the hole slope design requirement.

In the construction process, because the deep drain hole is limited by the construction site of the gallery, the drilling machine is required to have stable performance, be convenient for loading, unloading and transferring, provide larger power, perform construction operation in the gallery and ensure the engineering quality. In addition, the selection of the drill rod and the drilling tool, and the reasonable drilling process parameters and operation process thereof are key technologies for controlling the hole slope, and the real-time measurement of the hole slope in the drilling process and the adjustment of the hole slope according to the drilling track are effective measures for controlling the precision of the hole slope.

In the prior art, in the Chinese invention patent (CN103352687B) "method for controlling hole inclination of drilling", the deviation of hole inclination is controlled by arranging a corrector; chinese invention patent (CN102704909B) "a deep hole drilling hole inclination control construction method", set up the hole inclination control scheme suitable for it in the construction process according to different hole depths and hole rows; the hole inclination control techniques represented by these patent techniques increase the types of construction equipment required on site, and increase the construction cost; and because of the limitation of the operation conditions of the construction site and the foundation conditions of the dam body, nonstandard construction requirements often appear, which increases the complexity of the construction process and even has negative influence on the construction quality and the construction period.

In summary, it is urgently needed to provide a control method and a construction device for dam body drain hole precision in combination with the characteristics of the project, so as to meet the technical requirements of dam body drain hole construction and ensure the construction quality.

Disclosure of Invention

In order to solve the defects in the prior art, the invention aims to provide a dam body drain hole precision control method, the drain holes are divided into two types according to the critical value of 1% hole inclination, namely the drain holes smaller than the size of a reserved groove are controlled according to the 1% hole inclination, the drain holes larger than the size of the reserved groove are controlled according to the 1% hole inclination, different construction devices and precision control measures are respectively adopted for the two types of different holes, and finally, all the drain holes fall into the reserved groove according to the 1% hole inclination control.

The invention adopts the following technical scheme.

A control method for dam body drain hole precision comprises the following steps:

step 1, measuring and lofting by using a total station, and collecting coordinates of a drain hole preformed groove; determining the arrangement distance of the drain holes based on the coordinates of the drain hole preformed grooves, and determining the coordinates of drilling point positions on the elevation surface of the drain hole;

step 2, calculating the coordinates of the bottom of the drain hole by taking the 1% hole inclination as a critical value based on the coordinates of the reserved groove of the drain hole and the coordinates of the drilling point position on the elevation surface of the drain hole, and dividing the drain hole into the drain hole with the size smaller than the reserved groove according to the 1% hole inclination and the drain hole with the size larger than the reserved groove according to the 1% hole inclination;

step 3, for the drain hole which is controlled to be smaller than the size of the reserved groove according to the hole inclination rate of 1%, drilling from the drilling point position on the elevation surface of the drain hole to the top down, and enabling the size of the bottom of the drain hole and the edge of the reserved groove to be not smaller than the minimum distance;

step 4, for the drain hole with the hole inclination rate of 1 percent controlled to be larger than the size of the reserved groove, drilling a drain hole straight hole section from the drilling point position on the drain hole opening elevation surface to the top down, wherein the hole depth of the straight hole section is 0.5-1 m smaller than the designed hole depth; collecting the hole bottom coordinates of the straight hole section and the hole bottom coordinates of the drain hole, and calculating the positions of the residual drain hole sections penetrating through the corridor; when the position penetrating the gallery is in the reserved groove, the drain hole is punched from top to bottom according to normal construction; and when the position penetrating through the gallery is outside the preformed groove, drilling a hole from bottom to top in the preformed groove and communicating with the bottom of the hole of the straight hole section.

Preferably, the first and second electrodes are formed of a metal,

the step 1 comprises the following steps:

step 1.1, measuring and lofting by using a total station, measuring the outer contour of the formed drainage groove in the gallery, and making a measurement coordinate graph;

step 1.2, determining coordinates of the drain hole preformed groove according to the measurement coordinate graph, projecting the coordinates on a drain hole opening elevation surface, and checking the arrangement position of the drain hole preformed groove and the arrangement position of an embedded instrument;

step 1.3, carrying out moving treatment of avoiding a drain hole position on a drain hole outside the central line of the drain hole preformed groove and an embedded part inside the drain hole preformed groove;

step 1.4, determining the arrangement distance of the drain holes based on the coordinates of the drain hole preformed grooves, and determining the coordinates of drilling point positions on the elevation surface of the drain hole;

and step 1.5, uniformly numbering all the drain holes and performing measurement lofting.

Preferably, the first and second electrodes are formed of a metal,

in the step 2, the 1% hole slope rate is controlled to be smaller than the drain hole with the size of the reserved groove, namely the size of the hole bottom and the edge of the reserved groove meets the requirement of minimum distance after considering the construction deviation of the hole bottom, the allowable deviation of the hole position of the hole and the influence of the hole radius when the drain hole has the 1% hole slope rate;

the 1% hole slope ratio is controlled to be larger than the drain hole with the size of the reserved groove, namely the size of the hole bottom and the edge of the reserved groove cannot meet the requirement of the minimum distance after considering the construction deviation of the hole bottom, the allowable deviation of the hole position of the opened hole and the influence of the hole radius when the drain hole has the 1% hole slope ratio.

The minimum distance between the design hole bottom of the middle layer gallery and the size of the reserved groove edge is 45cm, and the minimum distance between the design hole bottom of the bottom layer gallery and the size of the reserved groove edge is 50 cm.

Preferably, the first and second electrodes are formed of a metal,

the step 3 comprises the following steps:

step 3.1, based on the drilling point position coordinates determined in the step 1, performing hole position preliminary alignment after the drilling machine is in place; performing ground anchor fixing, horizontal direction correction and vertical direction correction on the drilling machine to enable a vertical shaft of the drilling machine to be vertical to a horizontal plane, and then accurately correcting hole positions, wherein the centers of drill bits coincide with drilling point positions;

step 3.2, before drilling, correcting the drill rod to ensure that the drill rod is vertical to the horizontal plane; in the drilling process, correcting once every time a drill rod is added;

step 3.3, the drilling process further comprises:

3.3.1, determining the relation between the drilling depth and the outer diameter of the guide drill rods and the number of the guide drill rods in the drilling process by using a test method;

3.3.2, detecting the fastening degree of a fastener of the drilling machine and the drilling direction of a drill rod of the anchoring drilling machine in real time in the drilling process;

3.3.3, in the drilling process, if a reinforced concrete section is met, immediately stopping drilling, pulling out the drill, replacing the diamond drill bit for drilling, and after the drill penetrates through the reinforced steel bar layer, replacing the conventional drill bit and recovering drilling;

and 3.3.4, measuring the hole slope in the drilling process and the drilling process of the final hole section, and controlling the drilling deviation within the construction allowable range by using an anti-deviation drilling tool.

Step 3, an anti-slant drilling tool is also adopted to control the hole slope; the anti-slant drilling tool comprises: the drill bit comprises a drill limiting device, an orifice limiting device, a hard alloy righting block and a spiral drill rod.

The drilling machine power head moving foremost end and the orifice position are provided with limiting devices, and the drilling machine limiting devices and the orifice limiting devices are used for guiding and limiting the drilling tool when drilling holes and drilling shallow hole sections;

installing a hard alloy centering block on the drill rod, wherein the maximum outer diameter of the drill rod after the centering block is installed is smaller than the diameter of a drill hole; and welding the spiral sheet on the drill rod, wherein the maximum outer diameter of the welded drill rod is smaller than the diameter of the drilled hole.

Preferably, the first and second electrodes are formed of a metal,

step 4 comprises the following steps:

step 4.1, drilling construction of the straight hole section of the drain hole is carried out according to the step 3;

step 4.2, acquiring the hole bottom coordinates of the straight hole section and the hole bottom coordinates of the drain hole by using a non-metal acoustic detector, and calculating the positions of the residual drain hole sections penetrating through the gallery;

4.3, when the position penetrating through the gallery is in the preformed groove, performing drilling construction of the residual drainage hole section according to the step 3;

and 4.4, drilling an upward hole at the bottom of the self-drainage hole when the position of the through gallery is outside the reserved groove until the through gallery is communicated with the bottom of the straight hole section.

Step 4.2 comprises:

step 4.2.1, arranging a columnar ultrasonic transducer at the bottom of the straight hole section of the drain hole and transmitting ultrasonic waves;

step 4.2.2, respectively placing 1 planar ultrasonic transducer at the top corners of two sides of the preformed groove of the drain hole of the gallery, and respectively placing 1 planar ultrasonic transducer at two sides of the position 40 degrees away from the top of the groove; coordinates (x) of 4 planar ultrasonic transducers_i,y,z_i) Are known, wherein i ═ 1,2,3, 4;

step 4.2.3, when the columnar ultrasonic transducers at the bottom of the straight hole section of the drain hole transmit ultrasonic waves, 4 planar ultrasonic transducers in the reserved groove of the drain hole are respectively at different moments t_iReceiving ultrasonic waves, wherein i is 1,2,3, 4;

step 4.2.4, obtaining coordinates (x, y, z) of the hole bottom and the wave velocity V of the concrete according to the following relational expression_p；

And 4.2.5, calculating the position coordinate of the drain hole penetrating through the reserved groove according to the orifice coordinate of the drain hole and the hole bottom coordinate of the straight hole section of the drain hole.

Step 4.4, a drilling platform is also erected at the position of the bottom of the drain hole; according to different operation elevation surfaces in the gallery, a flat straight section and a slope section are erected on the drilling platform.

Compared with the prior art, the invention has the advantages that the precision control is implemented before and during the drilling process to ensure that the dimension of the bottom of the drain hole with the hole slope of 1 percent to the reserved groove edge meets the construction design requirement, and the real-time detection and correction of the hole slope during the drilling process obviously improve the construction quality; the precision control method provided by the invention is not only suitable for the construction of newly-drilled drain holes, but also has a good effect of controlling the hole slope in the process of dam body reinforcing, reforming and drilling.

Drawings

FIG. 1 is a flow chart of a control method for dam body drain hole accuracy of the present invention;

FIG. 2 is a projection diagram of a drain hole reservation groove in the dam body drain hole precision control method of the invention;

FIG. 3 is a detection schematic diagram of a non-metallic acoustic detector in the control method of dam body drain hole precision of the invention.

Detailed Description

The present application is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present application is not limited thereby.

In the preferred embodiment of the present invention, the body drainage holes comprise 588 holes and have a length of 18183.20 m. The dam body structure of the dam is divided into seven areas, wherein the top part of the dam is divided into four areas: a left water retaining dam section (the hole depth is 14.72-44.72 m), an overflow dam section (the hole depth is 13.08-30.58 m), a factory building dam section (the hole depth is 53.83m), and a right water retaining dam section (the hole depth is 17.02-53.63 m); the middle gallery is divided into three regions: the inspection gallery comprises a left bank 230.00 inspection gallery (with the hole depth of 8.47-36.47 m), a 212.50 inspection gallery (with the hole depth of 18.97-24.97 m) and a right bank 230.00 inspection gallery (with the hole depth of 7.97-36.47 m).

The drain hole at the dam top is positioned on the upstream side of the dam and penetrates through galleries in the dam and is arranged on a vertical drain hole curtain near the dam top or the overflow weir top, the drain hole mainly adopts an anchoring drilling machine MX-120A/MD-100A and is assisted with geological drilling XY-2 for drilling, and the drain hole is single-row and 3.0m apart (the dam section of a factory building is provided with a pipe section of 2.5m) and has the diameter of 150 mm. The bottom outlet of the drain hole is communicated with the arch top at the upstream side of the gallery, and the seepage water is led into a drain ditch at the bottom of the gallery through a PVC steel wire reinforced hose and is drained in a centralized manner.

Referring to fig. 1, a method for controlling the accuracy of a dam body drain hole comprises the following steps:

step 1, measuring and lofting by using a total station, and collecting coordinates of a drain hole preformed groove; and determining the arrangement distance of the drain holes based on the coordinates of the drain hole preformed grooves, and determining the coordinates of drilling point positions on the elevation surface of the drain hole.

In particular, the amount of the solvent to be used,

the step 1 comprises the following steps:

step 1.1, measuring and lofting by using a total station, measuring the outer contour of the formed drainage groove in the gallery, and making a measurement coordinate graph;

step 1.2, determining coordinates of the drain hole preformed groove according to the measurement coordinate graph, projecting the coordinates on a drain hole opening elevation surface, and checking the arrangement position of the drain hole preformed groove and the arrangement position of an embedded instrument;

step 1.3, carrying out moving treatment of avoiding a drain hole position on a drain hole outside the central line of the drain hole preformed groove and an embedded part inside the drain hole preformed groove;

step 1.4, determining the arrangement distance of the drain holes based on the coordinates of the drain hole preformed grooves, and determining the coordinates of drilling point positions on the elevation surface of the drain hole;

and step 1.5, uniformly numbering all the drain holes and performing measurement lofting.

And 2, calculating the coordinates of the bottom of the drain hole by taking the 1% hole inclination as a critical value based on the coordinates of the reserved groove of the drain hole and the coordinates of the drilling point position on the elevation surface of the drain hole, and dividing the drain hole into the drain hole with the size smaller than the reserved groove according to the 1% hole inclination and the drain hole with the size larger than the reserved groove according to the 1% hole inclination.

In particular, the amount of the solvent to be used,

in the step 2, the 1% hole slope rate is controlled to be smaller than the drain hole with the size of the reserved groove, namely the size of the hole bottom and the edge of the reserved groove meets the requirement of minimum distance after considering the construction deviation of the hole bottom, the allowable deviation of the hole position of the hole and the influence of the hole radius when the drain hole has the 1% hole slope rate;

the 1% hole slope ratio is controlled to be larger than the drain hole with the size of the reserved groove, namely the size of the hole bottom and the edge of the reserved groove cannot meet the requirement of the minimum distance after considering the construction deviation of the hole bottom, the allowable deviation of the hole position of the opened hole and the influence of the hole radius when the drain hole has the 1% hole slope ratio.

In the preferred embodiment of the invention, the plane position, the starting elevation, the ending elevation and the like of the drain hole of the dam body all meet the construction technical requirements, namely the drain hole is required to be drilled into a reserved groove at the bottom of the hole; as shown in fig. 2, the bottom gallery size is 1m × 1.5m, and the middle gallery size is 1m × 1.25 m; the minimum distance between the design hole bottom of the middle layer gallery and the edge of the reserved groove is 45cm, and the minimum distance between the design hole bottom of the bottom layer gallery and the edge of the reserved groove is 50 cm.

And (4) setting out each hole position by measurement, wherein the deviation between the planar perforated hole position and the designed hole position is not more than 5 cm.

According to the technical requirements of water stopping and drainage, hole slope measurement is carried out when the drain hole is drilled, and the hole slope requirement is not more than 1%. If the hole inclination of the drilled hole exceeds the specification, corrective measures should be taken in time. And (3) calculating the hole slope through the size of the reserve tank, wherein 198 holes in the total hole number do not meet the design technical requirements, namely, the hole slope falls outside the reserve tank according to 1 percent and accounts for 33.67 percent of the total hole number as shown in the table 1.

TABLE 11 statistical table of the number of water discharge holes with percent hole inclination falling into the preformed groove

In table 1, the dimension of the design hole bottom from the reserved slot edge is the minimum distance between the design hole bottom and the projected dimension edge of the reserved slot, that is, the minimum distance between the design hole bottom of the middle-layer gallery and the reserved slot edge is 45cm, and the minimum distance between the design hole bottom of the bottom-layer gallery and the reserved slot edge is 50cm in the construction requirement; the number of the drainage holes with the hole inclination of 1 percent falling outside the preformed groove is determined by considering the sum of the construction deviation of the hole bottom, the allowable deviation of the hole position of the opened hole of 5cm and the hole radius of 7.5cm which are controlled according to the hole inclination of not more than 1 percent, and the distance between the designed hole bottom and the projection dimension edge of the preformed groove still can not meet the construction requirement. Therefore, the drainage holes are divided into two categories by taking the 1% hole inclination as a control critical value, namely the drainage holes smaller than the size of the reserved groove are controlled according to the 1% hole inclination, and the drainage holes larger than the size of the reserved groove are controlled according to the 1% hole inclination. Different construction devices and precision control measures are respectively adopted for the two different types of holes, and finally, all the drain holes fall into the reserved grooves according to the control of the hole inclination rate of 1 percent.

And 3, for the drain hole which is controlled to be smaller than the size of the reserved groove according to the hole inclination rate of 1%, drilling from the drilling point position on the elevation surface of the drain hole to the top and the bottom, so that the size of the bottom of the drain hole and the edge of the reserved groove is not smaller than the minimum distance.

In particular, the amount of the solvent to be used,

the step 3 comprises the following steps:

step 3.1, based on the drilling point position coordinates determined in the step 1, performing hole position preliminary alignment after the drilling machine is in place; performing ground anchor fixing, horizontal direction correction and vertical direction correction on the drilling machine to enable a vertical shaft of the drilling machine to be vertical to a horizontal plane, and then accurately correcting hole positions, wherein the centers of drill bits coincide with drilling point positions;

the accuracy of the measurement loft is tightly controlled. Before the drilling machine is in place, after the drilling machine is in place and before drilling, an inclination angle and azimuth on-site graduator is used and a total station is combined to accurately check a hole position and an azimuth angle; when the drilling tool is installed, the axis of the drilling tool is required to be coincident with the axis of the designed hole, and the center of the drill bit is coincident with the hole position.

Ensuring that the drilled holes of the drain holes meet the requirement of hole inclination, fixing a drilling machine, and anchoring the four corners of the drilling machine by expansion screws; the tightening degree of the fastener of the drilling machine is often checked during the drilling process, and if the fastener is found to be loose, the fastener is fastened again at any time.

Checking whether the drilling direction of the vertical shaft of the geological drilling machine changes frequently or not, and timely correcting the found problems.

In the preferred embodiment of the invention, because the drain hole is deep and is limited by the construction site of the gallery, the drilling machine is required to have stable performance, be convenient for loading, unloading and transferring, provide larger power, perform construction operation in the gallery and ensure the engineering quality. Through comparison and selection and combined with previous similar engineering construction experience, the selected drilling machine mainly takes an MD100A/MX120A type hydraulic anchoring drilling machine as a main part and is assisted by an XY-2 geological drilling machine, and when a pneumatic drilling machine is used for drilling, a spray dust removal device is additionally arranged.

It should be noted that the selection of the drilling machine in the preferred embodiment of the present invention is a non-limiting preferred choice, and those skilled in the art can select different models of drilling machines according to the actual application requirements of the project.

In combination with the rig match requirements, the preferred embodiment of the invention uses 20m³And h, electrically driven air compressor.

Step 3.2, before drilling, correcting the drill rod to ensure that the drill rod is vertical to the horizontal plane; in the drilling process, correcting once every time a drill rod is added;

in the preferred embodiment of the invention, the selection of the drill rod needs to consider the strength, the structure and the slag returning effect, and the outer flat drill rods with the outer diameters of 50mm, 73mm and 89mm are commonly used, wherein the drill rod with the outer diameter of 50mm is lighter and lighter, the labor intensity of workers is low, but the guide property is poorer after the drill hole is deepened, the annular gap with the hole wall is large, the slag returning efficiency is low, the hole inclination and the shaking are easily generated, the screw thread of a joint is deformed, and the drill rod is difficult to unload; the drill rod with the outer diameter of 73mm has better guiding performance and high slag return efficiency than the drill rod with the outer diameter of 50mm, but the slag return efficiency is low and the transmission torque is insufficient after the drill rod with the outer diameter of more than 130mm is drilled; the drill rod with the outer diameter of 89mm has higher guiding and slag returning efficiency than the two drill rods, and has the defect of needing a large-power drilling machine. And (4) comprehensively selecting, and adopting a drill rod with the outer diameter of 89 mm.

It should be noted that the selection of the drill rod in the preferred embodiment of the present invention is a non-limiting preferred choice, and those skilled in the art can select drill rods with different outer diameters according to the actual application of the project.

Step 3.3, the drilling process further comprises:

3.3.1, determining the relation between the drilling depth and the outer diameter of the guide drill rods and the number of the guide drill rods in the drilling process by using a test method;

in the preferred embodiment of the invention, a guide drill rod with the outer diameter of 140mm is adopted when the drilling depth reaches 2m, and a guide drill rod with the outer diameter of 140mm is respectively added after the drilling depth reaches 5m, 15m and 25m respectively; the number of guided drill rods is increased by different drilling depths to control the oscillation of the drill rods, thereby reducing the hole slope.

3.3.2, detecting the fastening degree of a fastener of the drilling machine and the drilling direction of a drill rod of the anchoring drilling machine in real time in the drilling process;

in the preferred embodiment of the invention, the fastening degree of the fastener of the drilling machine is checked at any time during the drilling process, and if the fastener is loosened, the fastening is carried out again immediately. And (4) checking whether the drilling directions of the vertical shaft and the drill rod of the anchoring drilling machine are changed in time, and finding out the problems and correcting in time.

3.3.3, in the drilling process, if the reinforced concrete section is met, immediately stopping drilling, pulling out the drill, replacing the diamond drill bit for drilling, and after the drill penetrates through the reinforcing steel bar layer, replacing the conventional drill bit and resuming drilling;

and 3.3.4, measuring the hole slope in the drilling process and the drilling process of the final hole section, and controlling the drilling deviation within the construction allowable range.

The first 20m is controlled according to 2-5 m of drilling in the drilling process, the second 20m is controlled according to 5-10 m of drilling in the drilling process, the hole slope is measured in time, the drilling track is mastered in real time, the parameters of the guide device are adjusted correspondingly, the first initial detection is carried out at the hole depth of about 20m, the later self-detection is carried out at the time of about 5m of drilling, and the parameters of the guide device are adjusted timely according to different conditions of the drilling hole slope.

In the preferred embodiment of the invention, when the drilling depth is finally determined to be 15m and the final hole section in the drilling process through repeated tests, KXP-2D inclinometers are adopted to measure the hole slope once respectively, and if the drilling deviation is found to exceed the construction allowable range, correction measures are taken in time.

And step 3, controlling the hole slope by adopting an anti-slant drilling tool.

The anti-slant drilling tool comprises a drilling machine limiting device, an orifice limiting device, a hard alloy centering block and a spiral drill rod. And limiting devices are arranged at the most front end of the power head of the drilling machine and the position of the orifice, so that the guiding and limiting of the drilling tool are ensured when the drilling is carried out in the drilling process and the shallow hole section drilling is carried out, and the deviation is prevented. Installing hard alloy centralizing blocks on the front 10 drill rods behind the impactor, welding 4 groups of drill rods, wherein 4 blocks in each group are uniformly distributed along the axis of the drill rods, and each hard alloy centralizing block is 20cm long and is uniformly distributed with large-particle spherical hard alloy; the maximum outer diameter of the centering block after installation is 148mm and is smaller than the diameter of a drill hole by 150 mm; and (3) welding spiral sheets with the maximum outer diameter of 89mm on other drill rods, wherein the maximum outer diameter of the drill rods formed after welding is 148mm, and the welding length of each spiral sheet of the drill rods is 100 cm. The design of the anti-inclination drilling tool greatly increases the same-diameter length of the front part of the drilling tool, namely, the total length of the front part drilling tool is lengthened, the rigidity of the overall drilling tool is increased, the bending deflection of the drilling tool is reduced, and the overall deflection of the drilling tool is better controlled; the return speed of impact broken rock powder and slag is reduced after the centralizing block is installed; the spiral drill rod can improve the slag discharge capacity in the drilling process to a great extent and has the function of limiting the drill rod. The combined device has better hole inclination control effect in the process of drilling the prestressed anchor cable reinforced by the old dam.

Step 4, for the drain hole with the hole inclination rate of 1 percent controlled to be larger than the size of the reserved groove, drilling a drain hole straight hole section from the drilling point position on the drain hole opening elevation surface to the top down, wherein the hole depth of the straight hole section is 0.5-1 m smaller than the designed hole depth; collecting the hole bottom coordinates of the straight hole section and the hole bottom coordinates of the drain hole, and calculating the positions of the residual drain hole sections penetrating through the corridor; when the position penetrating the gallery is in the reserved groove, the drain hole is punched from top to bottom according to normal construction; and when the position penetrating through the gallery is outside the preformed groove, drilling a hole from bottom to top in the preformed groove and communicating with the bottom of the hole of the straight hole section.

In particular, the amount of the solvent to be used,

step 4 comprises the following steps:

and 4.1, drilling construction of the straight hole section of the drainage hole is carried out according to the step 3. Wherein, the depth of the straight hole section hole is reserved for 0.5 m-1 m without breaking before reaching the designed hole depth.

And 4.2, acquiring the hole bottom coordinates of the straight hole section and the hole bottom coordinates of the drain hole by using a non-metal acoustic detector, and calculating the positions of the residual drain hole sections penetrating through the gallery.

As in fig. 3, step 4.2 includes:

step 4.2.1, arranging a columnar ultrasonic transducer at the bottom of the straight hole section of the drain hole and transmitting ultrasonic waves;

step 4.2.2, respectively placing 1 planar ultrasonic transducer at the top corners of two sides of the preformed groove of the drain hole of the gallery, and respectively placing 1 planar ultrasonic transducer at two sides of the position 40 degrees away from the top of the groove; coordinates (x) of 4 planar ultrasonic transducers_i,y,z_i) Are known, wherein i ═ 1,2,3, 4;

step 4.2.3, when the columnar ultrasonic transducers at the bottom of the straight hole section of the drain hole transmit ultrasonic waves, 4 planar ultrasonic transducers in the reserved groove of the drain hole are respectively at different moments t_iReceiving ultrasonic waves, wherein i is 1,2,3, 4;

step 4.2.4, obtaining coordinates (x, y, z) of the hole bottom and the wave velocity V of the concrete according to the following relational expression_p；

And 4.2.5, calculating the position coordinate of the drain hole penetrating through the reserved groove according to the orifice coordinate of the drain hole and the hole bottom coordinate of the straight hole section of the drain hole.

In a preferred embodiment of the present invention, the parameter requirements of the non-metal acoustic wave detector include: the sampling length is 1024, the sampling rate is 1-2 mus, and the delay is as follows: 0-400 μ s, gain: 400-4000, band-pass filtering: 2-30 KHz, internal trigger mode.

And 4.3, when the position of the through gallery is in the preformed groove, performing drilling construction of the residual drainage hole section according to the step 3.

And 4.4, drilling an upward hole at the bottom of the self-drainage hole when the position of the through gallery is outside the reserved groove until the through gallery is communicated with the bottom of the straight hole section.

Step 4.4, a drilling platform is also erected at the position of the bottom of the drain hole; according to different operation elevation surfaces in galleries, a drilling platform is provided with a flat straight section and a slope section; the height of a drilling platform of the straight section is 1.8m, the length of the drilling platform is 2.5m, and the height of a vertical shaft for installing the drilling machine is not less than 0.7 m; the height of the drilling platform of the slope section is adjusted according to the height of the slope section, the height of a vertical shaft for installing the drilling machine is not less than 0.7m, and the length of the drilling platform is 6 m.

In the preferred embodiment of the invention, a hole is drilled upwards from the bottom, and considering that a circle of system anti-cracking reinforcing steel bars are arranged around the gallery and are threaded reinforcing steel bars with the diameter of 25mm, the reinforcing steel bars are cut off by a drilling tool when encountering the reinforcing steel bars in the drilling process; the selected rig is an SH-250 bench type engineering rig. According to the drilling process requirement and reasonable drilling tool grading, a drill rod with the outer diameter of 50mm and a drill rod with the outer diameter of 42mm are matched according to a drill bit with the outer diameter of 150 mm. Considering the size of a mast of a machine body of the HS-250 engineering drilling machine, the drilling depth (0.5-1 m) and the diameter of a thread of a machine head, a reducing joint is machined on a lathe in advance, a portable drill rod with the outer diameter of 42mm is supposed to be adopted through reducing joint combination, the drill rod is not too long in combination with a drill site space, and the length of a single drill rod is 50 cm. When the concrete core is drilled, a thin-wall single-layer rock core pipe is selected, and the specification selects 150mm in outer diameter and 50cm in length. Because the drilling hole is an upward hole and the past experience is used for reference, core cutting devices or clamp springs, material clamping and the like are not needed during core drilling.

Compared with the prior art, the invention has the advantages that the precision control is implemented before and during the drilling process to ensure that the dimension of the bottom of the drain hole with the hole slope of 1 percent to the reserved groove edge meets the construction design requirement, and the real-time detection and correction of the hole slope during the drilling process obviously improve the construction quality; the precision control method provided by the invention is not only suitable for the construction of newly-drilled drain holes, but also has a good effect of controlling the hole slope in the process of dam body reinforcing, reforming and drilling.

The present applicant has described and illustrated embodiments of the present invention in detail with reference to the accompanying drawings, but it should be understood by those skilled in the art that the above embodiments are merely preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not for limiting the scope of the present invention, and on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the scope of the present invention.