阅读说明：本技术 能捕获岩体弱区的注浆管装置及施工方法 (Grouting pipe device capable of capturing weak area of rock mass and construction method ) 是由 刘红坤 庞浩然 汪永宏 池庆清 王永喜 吕祥锋 于 2021-08-11 设计创作，主要内容包括：本发明涉及注浆管施工技术领域,提供了一种能捕获岩体弱区的注浆管装置及施工方法。所述装置包括外层注浆管、内层筒及控制单元；外层注浆管为柔性结构,沿轴线方向设置若干排外层注浆孔,外层注浆管管壁设置有压力感应片；内层筒沿轴线方向设置一排内层注浆孔；外层注浆管套装在内层筒外,内层筒在控制单元的控制下能在外层注浆管内旋转,使内层注浆孔与设定的外层注浆孔对齐。本发明可以在岩土体中通过识别软弱岩体存在位置实现自适应,自寻找,自转动寻找病害位置,把浆液填充到软弱岩体孔隙中。本发明结构简单,在满足隧道洞口段超前支护功能的同时,更精准寻找软弱岩体位置对其注浆,实现病害岩土体针对性加固,具有广阔应用前景。(The invention relates to the technical field of grouting pipe construction, and provides a grouting pipe device capable of capturing a weak area of a rock mass and a construction method. The device comprises an outer layer grouting pipe, an inner layer cylinder and a control unit; the outer layer grouting pipe is of a flexible structure, a plurality of rows of outer layer grouting holes are formed in the axial direction, and the pipe wall of the outer layer grouting pipe is provided with a pressure sensing sheet; the inner layer cylinder is provided with a row of inner layer grouting holes along the axis direction; the outer layer grouting pipe is sleeved outside the inner layer cylinder, and the inner layer cylinder can rotate in the outer layer grouting pipe under the control of the control unit, so that the inner layer grouting hole is aligned with the set outer layer grouting hole. The invention can realize self-adaptation, self-searching and self-rotation searching of the disease position in the rock-soil body by identifying the position of the weak rock body, and fills the slurry into the pores of the weak rock body. The invention has simple structure, can more accurately find the position of the weak rock mass to carry out grouting on the weak rock mass while meeting the advanced supporting function of the tunnel portal section, realizes the targeted reinforcement of the damaged rock mass and has wide application prospect.)

1. The grouting pipe device capable of capturing the weak area of the rock mass is characterized by comprising an outer layer grouting pipe, an inner layer cylinder and a control unit;

the outer layer grouting pipe is of a flexible structure, two rows or a plurality of rows of outer layer grouting holes are formed in the outer layer grouting pipe along the axis direction, and a pressure induction sheet capable of sensing the pressure of an external rock mass is arranged on the pipe wall of the outer layer grouting pipe;

the inner-layer cylinder is of a rigid structure, and is provided with a row of inner-layer grouting holes along the axis direction;

the outer layer grouting pipe is sleeved outside the inner layer cylinder, and the inner layer cylinder can rotate in the outer layer grouting pipe under the control of the control unit, so that the inner layer grouting holes are aligned with or staggered with the set outer layer grouting holes.

2. The grouting pipe device capable of capturing the weak area of the rock mass as claimed in claim 1, wherein the pipe wall of the outer layer grouting pipe is further provided with a first position sensing piece capable of sensing the position of the outer layer grouting hole, and the wall of the inner layer barrel is provided with a second position sensing piece capable of sensing the position of the inner layer grouting hole; the first position sensing piece and the second position sensing piece are in signal connection with the control unit.

3. The apparatus of claim 1, wherein the outer layer of the grout pipe comprises an inner base layer and an outer surface contact layer, and the pressure sensing strip is disposed between the base layer and the surface contact layer.

4. The grouting pipe device capable of capturing the weak area of the rock mass as claimed in claim 3, wherein the base layer and the surface contact layer are made of polyvinyl chloride or leather, and the pressure sensing piece is fixedly connected with the base layer and the surface contact layer through hot melt adhesive.

5. The grouting pipe device capable of capturing the weak area of the rock mass as claimed in claim 2, wherein the inner cylinder is a steel cylinder, and the second position sensing piece is arranged on the inner wall of the inner cylinder.

6. The apparatus of claim 1, wherein the outer layer of grouting holes are arranged in 3-8 rows and evenly around the circumference of the outer layer of grouting pipe.

7. The grouting pipe device capable of capturing the weak area of the rock mass as claimed in claim 1, wherein the control unit is a single chip microcomputer or an electronic computer.

8. A construction method using a grout pipe apparatus according to any one of claims 1 to 7 for trapping weak areas of rock mass, wherein the method comprises:

s1, driving the grouting pipe device capable of capturing the weak area of the rock mass into the hole after drilling;

s2, determining the stress threshold of the weak area of the rock mass according to the actual condition of the rock mass; the pressure induction sheets arranged in the outer layer grouting pipe measure stress values of positions where different pressure induction sheets are located, and when the measured stress values are smaller than the stress threshold value, the weak area of the rock body is judged;

s3, selecting the position of the outer layer grouting hole closest to the weak area of the rock mass by the control unit according to the position of the weak area of the rock mass;

s4, the control unit controls the rotation of the inner layer cylinder, so that the inner layer grouting holes of the inner layer cylinder are aligned with the outer layer grouting holes which are determined in the step S3 and are closest to the weak area of the rock mass;

s5, grouting: mortar is injected into the weak area of the rock mass through the inner layer grouting holes and the outer layer grouting holes in sequence to reinforce the weak area of the rock mass;

and S6, after grouting, firstly recovering the inner-layer barrel, and then recovering the outer-layer grouting pipe.

9. The construction method of grouting pipe device capable of capturing weak areas of rock mass as claimed in claim 8, wherein in step S5, when there are two or more weak areas of rock mass, the control unit controls the inner layer barrel to rotate to the outer layer grouting hole positions corresponding to the weak areas of different rock mass in turn and grouting is performed until grouting of all weak areas of rock mass is completed.

10. The method of constructing a grout pipe apparatus for trapping weak areas of rock mass according to claim 8, wherein the two rows of outer grout holes are simultaneously selected for grouting when the determined weak area of rock mass is located at the middle area between the two rows of outer grout holes at step S3.

Technical Field

The invention relates to the technical field of grouting pipe construction, in particular to a grouting pipe device capable of capturing a weak area of a rock mass and a construction method.

Background

The advanced pipe shed has the characteristics of large bending rigidity, long advance range, convenient construction and the like, is commonly used in the design and construction of tunnel portal sections (or underpass sections) of mountain tunnels or tunnels with large span and large section and shallow-buried underground excavation tunnels with poor geological conditions, and has the following construction procedures: drilling a horizontal borehole in the stratum by adopting an advanced horizontal drilling machine; inserting the hollow steel pipe with the grout penetration hole into the drilled hole; and (3) grouting the steel perforated pipe under pressure to ensure that the slurry completely fills the inner and outer gaps of the steel perforated pipe and effectively consolidates the surrounding unconsolidated formation.

From the stress analysis, the pipe advance shed is similar to a beam structure which is embedded in the stratum in advance, and with the advance of the tunnel face, the pipe advance shed bears partial surrounding rock pressure released by excavation, so that the surrounding rock pressure acting on the primary support is reduced. However, the effect of pouring the steel perforated pipes has defects at present, the structural difference of rock masses is not distinguished, the construction effect and the efficiency are not high after the steel perforated pipes are all seen.

Disclosure of Invention

The invention aims to overcome at least one of the defects of the prior art, provides a grouting pipe device capable of capturing a weak area of a rock mass and a construction method, and realizes intelligent searching of the position of the weak rock mass through stress monitored by a strain gauge type pressure sensing piece. When the steel perforated pipe rotates around the central shaft, the sensor monitors the stress-strain condition of the rock-soil body in real time, and the position of a weak area is captured according to the actual situation, so that intelligent grouting is realized. The construction scheme is completed more efficiently.

The invention adopts the following technical scheme:

on one hand, the invention provides a grouting pipe device capable of capturing a weak area of a rock mass, which comprises an outer layer grouting pipe, an inner layer cylinder and a control unit;

the outer layer grouting pipe is of a flexible structure, two rows or a plurality of rows of outer layer grouting holes are formed in the outer layer grouting pipe along the axis direction, and a pressure induction sheet capable of sensing the pressure of an external rock mass is arranged on the pipe wall of the outer layer grouting pipe;

the inner-layer cylinder is of a rigid structure, and is provided with a row of inner-layer grouting holes along the axis direction;

the outer layer grouting pipe is sleeved outside the inner layer cylinder, and the inner layer cylinder can rotate in the outer layer grouting pipe under the control of the control unit, so that the inner layer grouting holes are aligned with or staggered with the set outer layer grouting holes.

In any of the above possible implementation manners, there is further provided an implementation manner, wherein a first position sensing piece capable of sensing the position of the outer layer grouting hole is further disposed on the pipe wall of the outer layer grouting pipe, and a second position sensing piece capable of sensing the position of the inner layer grouting hole is disposed on the inner layer cylinder wall; the first position sensing piece and the second position sensing piece are in signal connection with the control unit.

There is further provided in accordance with any of the possible implementations set forth above, an implementation in which the pressure-sensitive strip is a strain gauge.

There is further provided in accordance with any of the possible implementations set forth above an implementation in which the outer layer slip casting pipe includes a base layer of an inner layer and a surface contact layer of an outer layer, the pressure-sensitive sheet being disposed between the base layer and the surface contact layer.

In any of the above possible implementation manners, there is further provided an implementation manner, wherein the substrate layer and the surface contact layer are made of polyvinyl chloride or leather, and the pressure sensing sheet is fixedly connected to the substrate layer and the surface contact layer through a hot melt adhesive.

In any of the above possible implementation manners, there is further provided an implementation manner, wherein the inner cylinder is a steel cylinder, and the second position sensing piece is disposed on an inner wall of the inner cylinder.

Any one of the above possible implementation manners further provides an implementation manner that the outer layer grouting holes are 3-8 rows and are uniformly arranged along the circumference of the outer layer grouting pipe.

Any one of the above possible implementation manners further provides an implementation manner, and the control unit is a single chip microcomputer or an electronic computer. The control unit is in control connection with the inner-layer barrel through a driving device.

In another aspect, the invention also provides a construction method using the grouting pipe device capable of capturing the weak area of the rock mass, which comprises the following steps:

s1, driving the grouting pipe device capable of capturing the weak area of the rock mass into the hole after drilling;

s2, determining the stress threshold of the weak area of the rock mass according to the actual condition of the rock mass; the pressure induction sheets arranged in the outer layer grouting pipe measure stress values of positions where different pressure induction sheets are located, and when the measured stress values are smaller than the stress threshold value, the weak area of the rock body is judged;

s3, selecting the position of the outer layer grouting hole closest to the weak area of the rock mass by the control unit according to the position of the weak area of the rock mass;

s4, the control unit controls the rotation of the inner layer cylinder, so that the inner layer grouting holes of the inner layer cylinder are aligned with the outer layer grouting holes which are determined in the step S3 and are closest to the weak area of the rock mass;

s5, grouting: mortar is injected into the weak area of the rock mass through the inner layer grouting holes and the outer layer grouting holes in sequence to reinforce the weak area of the rock mass;

and S6, after grouting, firstly recovering the inner-layer barrel, and then recovering the outer-layer grouting pipe.

In any of the above possible implementation manners, there is further provided an implementation manner, in step S5, when there are two or more weak rock areas, the control unit controls the inner barrel to rotate to different weak rock areas and to perform grouting in sequence until grouting of all weak rock areas is completed.

In any of the possible implementations described above, there is further provided an implementation that, in step S3, when the determined weak area of the rock mass is located in the middle area between the two rows of outer layer grouting holes, the two rows of outer layer grouting holes are simultaneously selected for grouting.

The invention has the beneficial effects that: the position of a weak rock mass can be accurately and intelligently searched for grouting, the specific reinforcement of the damaged rock mass is realized, and the surface material of the outer grouting pipe wall is a flexible material, so that the sensor can accurately judge to provide a more effective supporting effect for the forepoling shed pre-support; the technical scheme is simple and effective, and has wide application prospect.

Drawings

Fig. 1 is a schematic structural diagram of a grouting pipe device (sleeve) capable of capturing a weak area of a rock mass according to an embodiment of the invention.

Fig. 2 is a schematic structural diagram of a grouting pipe device (an outer grouting pipe and an inner grouting pipe are separated) capable of capturing a weak area of a rock mass according to an embodiment of the invention.

FIG. 3 is a schematic diagram showing the combination of the outer layer grouting pipe and the inner layer sleeve in the embodiment.

FIG. 4 is a schematic structural diagram of an outer layer grouting pipe in the embodiment.

Fig. 5 is a schematic view illustrating the arrangement of a second position-sensing piece in the embodiment.

Fig. 6 is a schematic flow chart of a construction method using a grouting pipe device capable of capturing a weak area of a rock mass according to an embodiment of the invention.

In the figure, 1-outer layer grouting holes; 2-a pressure sensing sheet; 3-outer layer grouting pipe; 4-inner layer cylinder; 5-a surface contact layer; 6-a substrate layer; 7-a connecting material; 8-a second position sensing sheet; 9-inner layer grouting holes.

Detailed Description

Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that technical features or combinations of technical features described in the following embodiments should not be considered as being isolated, and they may be combined with each other to achieve better technical effects. In the drawings of the embodiments described below, the same reference numerals appearing in the respective drawings denote the same features or components, and may be applied to different embodiments.

As shown in fig. 1-3, the grouting pipe device capable of capturing the weak area of the rock mass according to the embodiment of the invention comprises an outer layer grouting pipe 3, an inner layer barrel 4 and a control unit (not shown); the outer layer grouting pipe 3 is of a flexible structure, two rows or a plurality of rows of outer layer grouting holes 1 are formed in the outer layer grouting pipe 3 along the axis direction, and a pressure induction sheet 2 capable of sensing the pressure of an external rock mass is arranged on the pipe wall of the outer layer grouting pipe 3; the inner layer cylinder 4 is of a rigid structure, and a row of inner layer grouting holes 9 are formed in the inner layer cylinder 4 along the axis direction; the outer layer grouting pipe 3 is sleeved outside the inner layer cylinder 4, and the inner layer cylinder 4 can rotate in the outer layer grouting pipe 3 under the control of the control unit, so that the inner layer grouting holes 9 are aligned with or staggered with the set outer layer grouting holes 1. And during grouting, mortar enters the weak area of the rock body from the aligned inner layer grouting holes 9 and the set outer layer grouting holes 1 to reinforce the weak area of the rock body.

The outer layer grouting pipe 3 can adopt various forms to realize accurate sensing of the pressure of the surrounding rock mass. Preferably, as shown in fig. 4, the outer layer grouting pipe 3 includes a substrate layer 6 of an inner layer and a surface contact layer 5 of an outer layer, and the pressure-sensitive sheet 2 is disposed between the substrate layer 6 and the surface contact layer 5. In order to ensure that the connection between the substrate layer 6 and the surface contact layer 5, and between the pressure sensing piece 2 and the substrate layer 6 and the surface contact layer 5 is firm, a connecting material 7 can be used, for example, the connecting material 7 can be hot melt adhesive.

Preferably, a first position sensing piece (not shown) capable of sensing the position of the outer layer grouting hole 1 may be arranged on the pipe wall of the outer layer grouting pipe 3, and a second position sensing piece 8 capable of sensing the position of the inner layer grouting hole 9 is arranged on the cylinder wall of the inner layer cylinder 4, as shown in fig. 5; the first position sensing piece and the second position sensing piece 8 are in signal connection with the control unit. Through this kind of structure, the control unit can accurately control the position of outer slip casting pipe 3 and inlayer section of thick bamboo 4 to can realize that outer slip casting hole 1 and inlayer slip casting hole 9 are accurate counterpointed.

Preferably, the outer layer grouting pipe 3 is of a flexible structure, and the base layer 6 and the surface contact layer 5 can be made of polyvinyl chloride or leather, or other flexible materials suitable for construction. Because the outer slip casting 3 surface contact layer 5 adopts flexible material, integrated pressure-sensitive strip 2 can accurate survey rather than the stress strain change of surrounding rock around, and the stress strain condition that detects according to integrated pressure-sensitive strip 2 judges that a certain direction surrounding rock disease is serious, carries out the self-drive of inlayer section of thick bamboo 4 according to the soft and weak district position of live ground body.

The inner layer cylinder 4 is a rigid pipe, for example, a steel pipe, only one row of inner layer grouting holes 9 are arranged on the surface, and the second position sensing piece 8 is arranged on the inner wall of the inner layer cylinder, as shown in fig. 5.

The outer layer grouting holes 1 need to be matched with the weak area of the rock mass, the weak area of the rock mass cannot be determined in advance, and therefore multiple rows need to be arranged, for example, 3-8 rows can be arranged, and the outer layer grouting holes can be uniformly arranged along the periphery of the outer layer grouting pipe 3.

The control unit can be a single chip microcomputer or an electronic computer.

As shown in fig. 6, a construction method using a grout pipe apparatus capable of trapping a weak area of a rock mass according to an embodiment of the present invention includes:

s1, driving the grouting pipe device capable of capturing the weak area of the rock mass into the hole after drilling;

s2, determining the stress threshold of the weak area of the rock mass according to the actual condition of the rock mass; the pressure induction sheets 2 arranged in the outer layer grouting pipe 3 measure stress values of positions where different pressure induction sheets 2 are located, and when the measured stress values are smaller than the stress threshold value, the direction is judged to be a weak area of the rock body;

s3, selecting the position of the outer layer grouting hole 1 closest to the weak area of the rock mass by the control unit according to the position of the weak area of the rock mass;

s4, the control unit controls the rotation of the inner layer barrel 4, so that the inner layer grouting hole 9 of the inner layer barrel 4 is aligned with the outer layer grouting hole 1 which is determined in the step S3 and is closest to the weak area of the rock mass, and the inner layer barrel 4 stops rotating;

s5, grouting: mortar is injected into the weak area of the rock body through the inner layer grouting holes 9 and the outer layer grouting holes 1 in sequence to reinforce the weak area of the rock body;

s6, after grouting, firstly recovering the inner-layer barrel 4, and then recovering the outer-layer grouting pipe 3, wherein the outer-layer grouting pipe 3 is of a flexible structure and is easy to recover.

Take out outer slip casting pipe 3 and an inlayer section of thick bamboo 4 in the lump to through adjusting, separate outer slip casting pipe 3 and an inlayer section of thick bamboo 4, and with an inlayer section of thick bamboo 4 take in outer slip casting pipe 3 completely in, conveniently accomodate and put in order. The construction method not only reduces the capital investment on construction appliances, but also improves the construction efficiency and accelerates the construction process.

Preferably, in step S5, when there are two or more direction weak rock regions, the control unit controls the inner layer barrel 4 to rotate to different weak rock regions in sequence and to perform grouting until grouting of all weak rock regions is completed.

Preferably, in step S3, when the determined weak region of the rock mass is located in the middle region between the two rows of outer layer grouting holes 1, the two rows of outer layer grouting holes 1 can be simultaneously selected for grouting. When the distance from the outer layer grouting hole 1 in a certain row is more obvious, the outer layer grouting hole in the closest row is selected for grouting 1.

The invention can realize self-adaptation, self-searching and self-rotation searching of the disease position in the rock-soil body by identifying the position of the weak rock body, and fills the slurry into the pores of the weak rock body. The invention has simple structure, can more accurately and intelligently find the position of the weak rock mass to carry out grouting while meeting the advance support function of the tunnel portal section, realizes the targeted reinforcement of the damaged rock mass, and provides a more effective support for the advance pipe shed advance support.

While several embodiments of the present invention have been presented herein, it will be appreciated by those skilled in the art that changes may be made to the embodiments herein without departing from the spirit of the invention. The above examples are merely illustrative and should not be taken as limiting the scope of the invention.