阅读说明：本技术 一种三心拱平巷掘进中的六点定位施工方法 (Six-point positioning construction method in three-center arch roadway tunneling ) 是由 冯喜龙 于 2020-11-13 设计创作，主要内容包括：本发明公开了一种三心拱平巷掘进中的六点定位施工方法,所述方法包括明确炮眼关键参数、标定六个施工控制点、布置掏槽眼、内层辅助眼、外层辅助眼、周边眼和水沟眼等步骤；本发明通过预先标定巷道掘进中的六个控制点,然后根据六个控制点控制位置进行上下、两侧均匀布置炮眼,改变了习惯性或传统施工顺序,即由下向上或由上向下、由左至右或由右至左的顺序施工,可有效提高炮眼施工的准确性,提高巷道整体爆破成型率,从而减少二次爆破处理和支护修补等工序,提高施工生产效率和安全性。(The invention discloses a six-point positioning construction method in three-arch roadway tunneling, which comprises the steps of determining key parameters of blast holes, calibrating six construction control points, arranging cut holes, inner-layer auxiliary holes, outer-layer auxiliary holes, peripheral holes, ditch holes and the like; according to the invention, six control points in the roadway excavation are calibrated in advance, and then blast holes are uniformly distributed up and down and on two sides according to the control positions of the six control points, so that the habitual or traditional construction sequence is changed, namely the construction is performed in the sequence from bottom to top or from top to bottom, from left to right or from right to left, the accuracy of blast hole construction can be effectively improved, the integral blasting forming rate of the roadway is improved, the procedures of secondary blasting treatment, support repair and the like are reduced, and the construction production efficiency and safety are improved.)

1. A six-point positioning construction method in three-center arch roadway tunneling is characterized in that: the method comprises the following steps:

s1, determining key parameters of the tunnel construction blasthole according to the size of the tunnel section;

s2, calibrating six construction control points on the section of the roadway;

the first control point is arranged at the intersection point of the highest point of the arc top of the roadway and the central line of the roadway; the second control point and the third control point are symmetrically arranged at arch raising points of the heights of two side walls of the roadway respectively, and the wall height is equal to the roadway design height-1/3 roadway design width; the fourth control point is arranged at the intersection point of the lane waist line and the lane central line, and the waist line is generally a fixed value; the fifth control point and the sixth control point are respectively and symmetrically arranged at the bottom angles at the left side and the right side of the roadway and can be adjusted according to the design width of the roadway and the gradient of the bottom plate;

s3, uniformly arranging the cutting holes in the area under the center of the tunnel face by taking the fourth control point as a reference;

s4, uniformly arranging inner layer auxiliary holes and outer layer auxiliary holes layer by layer on the outer side of the slotted hole according to the principle that the upper auxiliary hole, the lower auxiliary hole and the auxiliary holes on the two sides of the slotted hole are mutually symmetrical;

s5, uniformly arranging other peripheral hole blastholes in the control ranges of the first control point, the second control point, the third control point, the fifth control point and the sixth control point by combining blasthole design parameters; the peripheral holes can be regulated and controlled between two points according to the designed interval of the blastholes, and when the designed interval cannot be provided with equidistant blastholes, the interval of the blastholes can be properly regulated according to the interval of each control point;

and S6, arranging a ditch eye at the bottom of the fifth control point or the sixth control point.

Technical Field

The invention relates to the technical field of mine drift tunneling construction, in particular to a six-point positioning construction method in three-arch drift tunneling.

Background

The underground mine roadway excavation mostly adopts a drilling blasting method, the roadway drilling is generally divided into a cutting hole, an auxiliary hole (which can be divided into an inner layer auxiliary hole and an outer layer auxiliary hole) and a peripheral hole according to the difference of blast hole effects, wherein the cutting hole and the peripheral hole have great influence on roadway blasting footage and blasting forming.

In the construction at present, the common habitual whole method is to construct a blast hole below the center of a roadway and then construct the blast hole, or vice versa; however, due to different designs of the section of the roadway and the distance between the blastholes and blasthole construction errors, when the blastholes are constructed in sequence in construction, key control points of the roadway cannot be accurately positioned, so that key hole positions in actual construction are deviated upwards or downwards (such as blastholes on two side wall surfaces) and leftwards or rightwards (such as blastholes in an arch-shaped interval and blastholes on a bottom plate), the angles of the bottom plate of the roadway, the heights of two side walls and the arch forming of the top have larger errors with the designed section, and accordingly, the problems that the integral forming of the roadway is poor, pumice is more, the supporting quantity is increased, the subsequent medium-length hole construction is influenced and the like are caused, part of construction errors can be repaired by hole-filling secondary blasting, bottom slag filling or supporting, and the like.

Disclosure of Invention

The invention aims to provide a six-point positioning construction method in three-arch roadway tunneling, which solves the problems of difficult construction quality control, low overall blasting forming rate of a roadway, need of secondary blasting treatment and support repair and the like by calibrating six construction control points on the section of the roadway and uniformly arranging blast holes by taking the control points as references, and improves the construction production efficiency and the safety.

The technical scheme adopted by the invention is as follows:

the invention provides a six-point positioning construction method in three-center arch roadway tunneling, which comprises the following steps:

s1, determining key parameters of the tunnel construction blasthole according to the size of the tunnel section;

s2, calibrating six construction control points on the section of the roadway;

the first control point is arranged at the intersection point of the highest point of the arc top of the roadway and the central line of the roadway; the second control point and the third control point are symmetrically arranged at arch raising points of the heights of two side walls of the roadway respectively, and the wall height is equal to the roadway design height-1/3 roadway design width; the fourth control point is arranged at the intersection point of the lane waist line and the lane central line, and the waist line is generally a fixed value; the fifth control point and the sixth control point are respectively and symmetrically arranged at the bottom angles at the left side and the right side of the roadway and can be adjusted according to the design width of the roadway and the gradient of the bottom plate;

s3, uniformly arranging the cutting holes in the area under the center of the tunnel face by taking the fourth control point as a reference;

s4, uniformly arranging inner layer auxiliary holes and outer layer auxiliary holes layer by layer on the outer side of the slotted hole according to the principle that the upper auxiliary hole, the lower auxiliary hole and the auxiliary holes on the two sides of the slotted hole are mutually symmetrical;

s5, uniformly arranging other peripheral hole blastholes in the control ranges of the first control point, the second control point, the third control point, the fifth control point and the sixth control point by combining blasthole design parameters; the peripheral holes can be regulated and controlled between two points according to the designed interval of the blastholes, and when the designed interval cannot be provided with equidistant blastholes, the interval of the blastholes can be properly regulated according to the interval of each control point;

and S6, arranging a ditch eye at the bottom of the fifth control point or the sixth control point.

Compared with the prior art, the invention has the following beneficial effects:

the six-point positioning construction method in the three-arch drift driving changes the habitual or traditional construction sequence-construction from bottom to top or from top to bottom, from left to right or from right to left, can effectively improve the accuracy of blast hole construction and the forming rate of the overall blasting of the tunnel, thereby reducing the procedures of secondary blasting treatment, support repair and the like and improving the construction production efficiency and safety.

Drawings

FIG. 1 is a schematic diagram of the calibration of six control points according to the present invention;

FIG. 2 is a construction effect diagram of the blasthole arrangement of the present invention.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

It should be noted that in the description of the present invention, the terms "upper", "lower", "top", "bottom", "one side", "the other side", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not mean that a device or an element must have a specific orientation, be configured and operated in a specific orientation.

The invention provides a six-point positioning construction method in three-center arch roadway tunneling, which comprises the following steps:

s1, determining key parameters of the tunnel construction blasthole according to the size of the tunnel section;

s2, calibrating six construction control points on the section of the roadway;

referring to fig. 1 to 2, a first control 1 is arranged at the intersection point of the highest point of the arc top of the roadway and the central line 12 of the roadway; the second control point 2 and the third control point 3 are respectively and symmetrically arranged at the arch raising points of the wall heights at two sides of the roadway, namely the left end and the right end of the arch raising line 13 of the roadway, wherein the wall height is the roadway design height-1/3 roadway design width; the fourth control point 4 is arranged at the intersection point of the lane waistline 14 and the lane central line 12, and the height of the waistline 14 is generally a fixed value; the fifth control point 5 and the sixth control point 6 are respectively and symmetrically arranged at the bottom angles of the left side and the right side of the roadway, and the position of the sixth control point 6 can be adjusted according to the design width of the roadway and the gradient of the bottom plate;

s3, with reference to the fourth control point 4, uniformly arranging the cut holes 7 in the area under the center of the tunnel face, wherein the cut holes 7 are arranged in the area between the fourth control point 4 and the lane central line 15, and in the present embodiment, thirteen cut holes 7 are uniformly arranged;

s4, uniformly arranging inner layer auxiliary holes 8 and outer layer auxiliary holes 9 layer by layer outside the undercut hole 7 according to the principle that the upper, lower and both side auxiliary holes of the undercut hole 7 are symmetrical to each other, wherein the inner layer auxiliary holes 8 and the outer layer auxiliary holes 9 are respectively arranged layer by layer at uniform intervals according to the profile of the roadway, in this embodiment, two layers are arranged for the inner layer auxiliary holes 8, one layer is arranged for the outer layer auxiliary holes 9, four auxiliary blastholes are uniformly arranged for the first layer inner layer auxiliary holes 8 according to the profile of the roadway, eleven auxiliary blastholes are uniformly arranged for the second layer inner layer auxiliary holes 8 according to the profile of the roadway, and fifteen auxiliary blastholes are uniformly arranged for the outer layer auxiliary holes 9 according to the profile of the;

s5, uniformly arranging other peripheral holes 10, namely, twenty-five auxiliary holes according to the contour of the roadway, in the control range of the first control point 1, the second control point 2, the third control point 3, the fifth control point 5 and the sixth control point 6 by combining the hole design parameters, wherein the peripheral holes 10 are the outermost circle of holes of the roadway; the peripheral holes 10 can be regulated and controlled between two points according to the designed interval of the blastholes, and when the designed interval cannot be provided with equidistant blastholes, the interval of the blastholes can be properly regulated according to the interval of each control point;

s6, arranging a gutter eye 11 at the bottom of the fifth control point 5 or the sixth control point 6, wherein the gutter eye 11 is arranged at the bottom of the sixth control point 6 in the embodiment.

The first control point 1 is used for positioning the middle point of the arc top, so that the center positioning of the arch of the roadway can be effectively controlled, the arch forming is improved, and the phenomenon that the arch of the top of the roadway inclines to the left or right or the top of the roadway forms a triangular pointed shape is reduced;

the second control point 2 and the third control point 3 are arranged at high arching points of the walls on the two sides and are used for controlling the wall height forming of the roadway, ensuring the boundary between the wall height and the arch, preventing the wall surfaces on the two sides from being higher or lower, facilitating the formation of the designed arch and improving the safety and stability of the roadway;

the fourth control point 4 is arranged at the intersection point of the waist line 14 and the roadway center line 12 and can be used as a reference point for arrangement of the cutting hole 7, the fifth control point 5 and the sixth control point 6, and the fact that the auxiliary holes on the outer side of the cutting hole 7 are uniform and symmetrical is guaranteed, and blasting footage is improved.

Fifth control point 5 and sixth control point 6 set up in tunnel both sides base angle, can effectively control the roughness of tunnel bottom plate to reduce the bottom and surpass owing digging.

According to the invention, six control points in roadway excavation are calibrated in advance, and then blast holes are uniformly distributed on the upper side, the lower side and the two sides according to the control positions of the six control points, which is specifically shown in an attached figure 2; the invention changes the habitual or traditional construction sequence, namely the construction from bottom to top or from top to bottom, from left to right or from right to left, can effectively improve the accuracy of blast hole construction and the overall blasting forming rate of the roadway, thereby reducing the procedures of secondary blasting treatment, support repair and the like and improving the construction production efficiency and safety.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.