阅读说明：本技术 一种冻结普通掘进预制井壁支护的施工方法 (Construction method for freezing common tunneling prefabricated well wall support ) 是由 宋立平 宋伟 刘清宝 华召文 杨福珍 王长友 郭建南 张超 王同光 杨子星 周府 于 2021-08-27 设计创作，主要内容包括：本发明公开了一种冻结普通掘进预制井壁支护的施工方法,包括步骤：1)对井筒施工处地层进行冻结；2)井筒冻结交圈后,对立井进行施工,施工一个立井段高后,采用膜板绑扎钢筋、浇筑混凝土、施工外层井壁直施工至立井井筒底部；3)施工内层井壁时,对预制管片进行吊运,井下组装,一直从立井井筒底部施工至井口；4)安装内层井壁时同步利用预制管片的安装及注浆孔对内层井壁与外壁之间的间隙进行注浆处理。施工内层井壁时,本发明利用地面提前预制好的立井井壁管片进行井下组装,从而解决了立井井壁施工质量差,内层井壁厚度大、工期长的问题、工人劳动强度大的问题。(The invention discloses a construction method for freezing a common tunneling prefabricated well wall support, which comprises the following steps: 1) freezing the stratum at the construction position of the shaft; 2) after the shaft is frozen and looped, constructing the vertical shaft, and after a vertical shaft section is constructed, binding reinforcing steel bars by using a diaphragm plate, pouring concrete, constructing an outer-layer shaft wall and constructing to the bottom of the vertical shaft; 3) when an inner-layer well wall is constructed, the prefabricated pipe pieces are hoisted and assembled underground, and the prefabricated pipe pieces are constructed to a well mouth from the bottom of a vertical shaft; 4) and when the inner-layer well wall is installed, the gap between the inner-layer well wall and the outer wall is subjected to grouting treatment by synchronously utilizing the installation of the prefabricated pipe piece and the grouting hole. When the inner-layer well wall is constructed, the invention utilizes the vertical well wall duct pieces prefabricated in advance on the ground to carry out underground assembly, thereby solving the problems of poor construction quality of the vertical well wall, large thickness of the inner-layer well wall, long construction period and high labor intensity of workers.)

1. A construction method for freezing a common tunneling prefabricated well wall support is characterized by comprising the following steps:

1) freezing the stratum at the construction position of the shaft;

2) after the shaft is frozen and looped, constructing the vertical shaft, and after a vertical shaft section is constructed, binding reinforcing steel bars by using a diaphragm plate, pouring concrete, constructing an outer-layer shaft wall and constructing to the bottom of the vertical shaft;

3) when an inner-layer well wall is constructed, the prefabricated pipe pieces are hoisted and assembled underground, and the prefabricated pipe pieces are constructed to a well mouth from the bottom of a vertical shaft;

4) and when the inner-layer well wall is installed, the gap between the inner-layer well wall and the outer wall is subjected to grouting treatment by synchronously utilizing the installation of the prefabricated pipe piece and the grouting hole.

2. The construction method for freezing a common tunneling prefabricated well wall support according to claim 1, characterized in that in the step 2), a water cushion groove is arranged at the joint of the pipe piece of the outer well wall and the pipe piece of the inner well wall, and a water stop cushion which expands when water is filled is arranged when the pipe piece of the inner well wall is installed

3. The construction method for freezing a common tunneling prefabricated well wall support according to claim 1, characterized in that in the step 3), the pipe pieces are manufactured according to the diameter of the well shaft, and 6 pipe pieces are assembled into a ring and completed by adopting a through joint assembling method and a staggered joint assembling method.

4. The construction method for freezing a common tunneling prefabricated well wall support according to claim 3, characterized in that the annular segments are connected by high-strength bolts. The vertical bolt hole that sets up of section of jurisdiction, the section of jurisdiction sets up steel bolt through the bolt hole and connects between the ring.

5. The construction method for the frozen common tunneling prefabricated well wall support according to claim 3, characterized in that water stop pads are arranged between the annular direction of the duct piece and the annular direction of the duct piece.

6. The construction method for freezing a common tunneling prefabricated well wall support according to claim 3, wherein the segment splicing positioning block D, the splicing standard blocks B1 and B2 are crossed left and right; assembling the adjacent blocks L1 and L12 to be crossed left and right, and finally assembling the F block to be inserted longitudinally.

Technical Field

The invention relates to a construction method of a mine vertical shaft, in particular to a construction method of a frozen common tunneling prefabricated shaft wall support.

Background

In engineering design, a geological condition that the water inflow of a vertical shaft is large is often met, and because the water inflow of the shaft is large, a construction method of sinking the shaft by a freezing method has to be adopted in many mines. The construction method that the inner wall and the outer wall of the vertical shaft wall are both made of concrete poured by the templates, the inner layer wall of the shaft is made of a sliding formwork construction method, and the shaft wall is made of high-grade concrete, so that the thickness of the shaft wall is large, the construction condition is poor, the problem of hydration heat is not solved, and the construction method has the defects that the thickness of the inner layer wall of the shaft is large, the vertical shaft wall of the shaft needs to be bound with reinforcing steel bars and poured with concrete, the maintenance period is long, the construction quality of the shaft wall of the shaft is poor, the labor intensity of workers is high, the construction period of the shaft wall of the shaft is long, and the like.

Disclosure of Invention

The invention aims to provide a construction method for freezing a common tunneling prefabricated well wall support aiming at the existing problems. When the inner-layer well wall is constructed, the vertical well wall segments prefabricated on the ground in advance are utilized for underground assembly, so that the problems that the vertical well wall is poor in construction quality, the inner-layer well wall is large in thickness, the construction period is long, and the labor intensity of workers is large are solved.

In order to achieve the purpose, the invention adopts the technical scheme that:

a construction method for freezing a common tunneling prefabricated well wall support comprises the following steps:

1) freezing the stratum at the construction position of the shaft;

2) after the shaft is frozen and looped, constructing the vertical shaft, and after a vertical shaft section is constructed, binding reinforcing steel bars by using a diaphragm plate, pouring concrete, constructing an outer-layer shaft wall and constructing to the bottom of the vertical shaft;

3) when an inner-layer well wall is constructed, the prefabricated pipe pieces are hoisted and assembled underground, and the prefabricated pipe pieces are constructed to a well mouth from the bottom of a vertical shaft;

4) and when the inner-layer well wall is installed, the gap between the inner-layer well wall and the outer wall is subjected to grouting treatment by synchronously utilizing the installation of the prefabricated pipe piece and the grouting hole.

The invention has the further improvement that in the step 2), a water cushion groove is arranged at the butt joint of the pipe piece of the outer well wall and the pipe piece of the inner well wall, and a water stop cushion which expands when meeting water is arranged when the pipe piece of the inner well wall is arranged

The invention has the further improvement that in the step 3), the pipe pieces are manufactured according to the diameter of the shaft, and 6 pipe pieces are assembled into a ring and completed by adopting a through joint assembling method and a staggered joint assembling method.

The invention is further improved in that the annular parts of the pipe pieces are connected by high-strength bolts. The vertical bolt hole that sets up of section of jurisdiction, the section of jurisdiction sets up steel bolt through the bolt hole and connects between the ring.

The invention has the further improvement that water stop pads are arranged between the pipe pieces and between the ring directions of the pipe pieces.

The invention has the further improvement that the duct piece assembling positioning block D blocks and the assembling standard blocks B1 and B2 are crossed left and right; assembling the adjacent blocks L1 and L12 to be crossed left and right, and finally assembling the F block to be inserted longitudinally.

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

the invention provides a construction method for freezing a common tunneling prefabricated well wall support, which adopts freezing construction and common tunneling, adopts formwork construction to pour concrete for an outer well wall person, adopts ground prefabricated vertical well wall pipe pieces when constructing an inner vertical well wall, carries out underground assembly, and utilizes pipe piece grouting pipes to carry out inner and outer well wall grouting. The problems of poor construction quality of the vertical shaft wall, large thickness of the inner layer wall, long construction period and high labor intensity of workers are solved. The method has the advantages of guaranteed and controllable quality of the inner well wall of the vertical shaft, low safety risk, low cost, high construction speed, short construction period, low investment and the like.

Drawings

FIG. 1 is a diagram of the borehole wall structure.

Fig. 2 is a schematic diagram of the assembling sequence of prefabricated pipe pieces on the inner well wall of the vertical well.

Fig. 3 is a diagram of the position of the tube sheet after looping.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

The invention provides a construction method for freezing a common tunneling prefabricated well wall support, which comprises the following steps of:

1) freezing the stratum at the construction position of the shaft;

2) after the shaft is frozen and jointed, the vertical shaft is constructed by adopting a common method, after a vertical shaft section is constructed to be high, a diaphragm plate is adopted for binding reinforcing steel bars, concrete is poured, the outer wall of the shaft is constructed to be constructed to the bottom of the vertical shaft, a water cushion groove is arranged at the joint of the segment of the outer wall of the shaft and the segment of the inner wall of the shaft, and a water-swelling water stop cushion is arranged when the segment of the inner wall of the shaft is installed.

3) When the inner-layer well wall is constructed, the prefabricated pipe pieces are lifted and assembled underground, and the construction is always carried out from the bottom of the vertical shaft to a well mouth. The pipe pieces are manufactured according to the diameter of a shaft, the number of the pipe pieces which are generally assembled into a ring is 6, and through joint assembling and staggered joint assembling methods can be adopted. The segments are connected in the circumferential direction by high-strength bolts. The vertical bolt hole that sets up of section of jurisdiction, the section of jurisdiction sets up steel bolt through the bolt hole and connects between the ring. Water stopping pads are arranged between the annular direction of the duct piece and the annular direction of the duct piece.

The segment assembling positioning blocks D and the assembling standard blocks B1 and B2 are crossed left and right; assembling the adjacent blocks L1 and L12 to be crossed left and right, and finally assembling the F block to be inserted longitudinally.

The structure diagram of the vertical shaft wall is shown in figure 1, the assembly sequence diagram of prefabricated pipe pieces on the inner layer shaft wall of the vertical shaft is shown in figure 2, and the position of the pipe pieces after ring forming is shown in figure 3.

4) And when the inner-layer well wall is installed, the gap between the inner-layer well wall and the outer wall is subjected to grouting treatment by synchronously utilizing the installation of the prefabricated pipe piece and the grouting hole.

Examples

The net diameter is 7.0m, the inner well wall is 500mm, the outer wall well wall is 450mm, and the inner well wall is 6 parts with the same size. The method comprises the following specific steps:

1) freezing the stratum at the construction position of the shaft;

2) after the shaft is frozen and jointed, the vertical shaft is constructed by adopting a common method, after a vertical shaft section is constructed to be high, a diaphragm plate is adopted for binding reinforcing steel bars, concrete is poured, the outer wall of the shaft is constructed to be constructed to the bottom of the vertical shaft, a water cushion groove is arranged at the joint of the segment of the outer wall of the shaft and the segment of the inner wall of the shaft, and a water-swelling water stop cushion is arranged when the segment of the inner wall of the shaft is installed.

3) When the inner-layer well wall is constructed, the prefabricated pipe pieces are lifted and assembled underground, and the construction is always carried out from the bottom of the vertical shaft to a well mouth. The pipe pieces are manufactured according to the diameter of a shaft, the number of the pipe pieces which are generally assembled into a ring is 6, and through joint assembling and staggered joint assembling methods can be adopted. The segments are connected in the circumferential direction by high-strength bolts. The vertical bolt hole that sets up of section of jurisdiction, the section of jurisdiction sets up steel bolt through the bolt hole and connects between the ring. Water stopping pads are arranged between the annular direction of the duct piece and the annular direction of the duct piece.

The segment assembling positioning blocks D and the assembling standard blocks B1 and B2 are crossed left and right; assembling the adjacent blocks L1 and L12 to be crossed left and right, and finally assembling the F block to be inserted longitudinally.

The structure diagram of the vertical shaft wall is shown in figure 1, the assembly sequence diagram of prefabricated pipe pieces on the inner layer shaft wall of the vertical shaft is shown in figure 2, and the position of the pipe pieces after ring forming is shown in figure 3.

4) And when the inner-layer well wall is installed, the gap between the inner-layer well wall and the outer wall is subjected to grouting treatment by synchronously utilizing the installation of the prefabricated pipe piece and the grouting hole.

Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.