WO2020259266A1

WO2020259266A1 - Novel mining double-layer borehole wall having root-type anchoring

Info

Publication number: WO2020259266A1
Application number: PCT/CN2020/094903
Authority: WO
Inventors: 王磊; 李方政; 崔灏; 高伟; 许舒荣; 谭杰; 姜国静; 张基伟; 陈红蕾; 孔令辉; 姜浩亮; 韩玉福; 丁航; 方亮文
Original assignee: 北京中煤矿山工程有限公司
Priority date: 2019-06-26
Filing date: 2020-06-08
Publication date: 2020-12-30
Also published as: CN110185451A; CN110185451B; AU2020273364A1; AU2020273364B2

Abstract

A mining double-layer borehole wall having root-type anchoring, comprising a double-layer borehole wall and anchoring components (6), a first end of each anchoring component (6) being disposed in surrounding rock (1), a second end thereof being fixedly connected to the double-layer borehole wall, and the plurality of anchoring components (6) being arranged on the double-layer borehole wall along the circumferential direction thereof; the double-layer borehole wall comprises an outer borehole wall (2) and an inner borehole wall (3); each anchoring component (6) comprises an anchoring rod (7) and steel cables (13); a first end of each anchoring rod (7) is disposed in the surrounding rock (1) outside of the outer borehole wall (2), and a second end thereof is connected to an outer borehole wall steel grid (4) provided inside the outer borehole wall (2); a first end of each steel cable (13) is connected to the second end of the anchoring rod (7), and a second end thereof is connected to an inner borehole wall steel grid (5) provided inside the inner borehole (3); and a waterproof plastic plate is arranged between the outer borehole wall (2) and the inner borehole wall (3). Applying flexible restraints to the inner wall increases the overall load-bearing capability of the borehole wall, and allows for a corresponding reduction in the diameter of the vertical rebar in the outer wall, reduction in the surface area requiring excavation, and reduction in the surface area requiring freezing, thus reducing borehole construction costs.

Description

A new type of rooting and anchoring double-layer shaft wall for mine

Technical field

The invention relates to the technical field of well sinking. Specifically, it is a new type of rooting and anchoring double-layer shaft wall for mines.

Background technique

Freezing method sinking is an important method in the construction of coal mines in western my country. The shaft wall constructed by freezing method is mostly a double-layer reinforced concrete structure consisting of an inner wall and an outer wall. The outer wall mainly bears the freezing pressure and the weight of the shaft wall during the construction period. The inner well wall mainly bears the water pressure from the outer wall or interlayer. As my country's coal mine shaft construction develops to the west, new mine shafts pass through multiple aquifers, and the water head height can reach more than 600m. When the inner wall is designed in accordance with the "Coal Mine Shaft and Chamber Design Specification GB50384-2016", the shaft wall thickness increases sharply. The thickness of the inner wall of the auxiliary shaft of Bayangole Mine is 2m, the thickness of the inner wall of the auxiliary shaft of Hetaoyu Coal Mine is 1.6m, and the thickness of the inner wall of the auxiliary shaft of Mudu Chaideng Mine is 1.8m. The sharp increase in the thickness of the shaft wall has caused the shaft excavation radius to become larger, the excavation area has doubled, and the amount of concrete and the frozen volume have greatly increased, which has increased the construction cost and construction difficulty of the shaft. With the deep development of mine construction, the urgency of developing new types of shaft lining structures and construction techniques, reducing the thickness of shaft linings and reducing engineering costs has become increasingly prominent.

Summary of the invention

Therefore, the technical problem to be solved by the present invention is to provide a new type of anchored double-layer reinforced concrete shaft wall, which improves the bearing capacity of the entire shaft wall by imposing flexible constraints on the inner wall without changing the design method. , The diameter of the vertical steel bars on the outer wall, the tunneling area and the freezing area can be reduced correspondingly, and the cost of well construction can be reduced.

In order to solve the above technical problems, the present invention provides the following technical solutions:

A new type of rooting and anchoring double-layer shaft wall for mines includes a double-layer shaft wall and an anchoring member. The first end of the anchoring member is set in the surrounding rock, and the second end of the anchoring member is connected to the double-layer The well wall is fixedly connected, the double-layer well wall is provided with a plurality of the anchoring members along the circumference of the double-layer well wall; the double-layer well wall includes an outer well wall and an inner well wall, and the anchoring members include An anchor rod and a steel wire rope; the first end of the anchor rod is arranged in the surrounding rock outside the outer shaft wall, and the second end of the anchor rod is connected with the outer shaft wall in the outer shaft wall with a reinforcement mesh; the first steel wire rope The second end of the anchor rod is connected, and the second end of the steel wire rope is connected with the inner shaft wall in the inner shaft wall with a rib mesh; a water-proof plastic is arranged between the outer shaft wall and the inner shaft wall board.

The above-mentioned new type of rooting and anchoring double-layer shaft wall for mines, the second end of the anchor rod is fixedly connected with the outer shaft wall by a reinforcing mesh through a blocking member.

The above-mentioned new type of rooting and anchoring double-layer shaft wall for mines, the locking member includes a first nut, a second nut, a first anti-pull plate and a second anti-pull plate; the second end of the anchor rod passes through the first A nut, the first anti-pull plate, the second anti-pull plate and the second nut are connected to the first end of the steel wire rope, and the second end of the anchor rod is respectively connected to the first nut and the The second nut is connected; when the first nut and the second nut are respectively screwed in and tightened close to the outer shaft wall with a rib mesh, the first anti-pull plate is arranged on the outer shaft wall Outside of the rib net, the second anti-pull plate is arranged inside the rib net for the outer well wall.

In the above-mentioned new type of mine-used rooting and anchoring double-layer shaft wall, the locking member further includes a lock, and the second end of the anchor rod is connected to the first end of the steel wire rope through the lock.

The above-mentioned new type of rooting and anchoring double-layer shaft wall for mines, the lock includes a locking plate, and the locking plate is provided with a wire rope locking hole and an anchor rod that penetrate the upper and lower surfaces of the locking plate Locking hole; when the first end of the steel wire rope and the second end of the anchor rod are connected by the lock buckle, the first end of the steel wire rope is arranged in the wire rope locking hole, and the second end of the anchor rod It is arranged in the anchor rod locking hole.

The above-mentioned new type rooting and anchoring double-layer shaft wall for mines, when the steel wire ropes in one anchoring member are greater than or equal to 2, the wire rope locking holes are arranged at equal intervals along the circumferential direction of the bolt locking holes .

In the above-mentioned new type of mine-used rooting and anchoring double-layer shaft wall, the wire rope locking hole and the anchor rod locking hole are connected upwards at the bolt locking aperture; when the first end of the wire rope is set on the wire rope lock When the second end of the anchor rod is arranged in the anchor rod locking hole, the first end of the steel wire rope is in contact with the second end of the anchor rod.

The above-mentioned new type rooting and anchoring double-layer shaft wall for mines, the first end of the anchor rod is fixedly connected with the surrounding rock through an anchoring agent; the length of the anchor rod located in the surrounding rock is 0.8-1.2m.

In the above-mentioned new type of rooting and anchoring double-layer shaft wall for mines, when the freezing method is adopted for sinking the shaft, the first end of the anchor rod is located inside the cylinder surrounded by the freezing pipe.

In the above-mentioned new type of mine-used rooting and anchoring double-layer shaft wall, the steel wire rope between the first end of the steel wire rope and the second end of the steel wire rope is sheathed with an elastic material tube.

The technical scheme of the present invention has achieved the following beneficial technical effects:

1. The present invention is based on the well wall design theory. The outer wall uses a flexible material (steel rope) to connect the inner wall, so that the inner wall is connected with the outer wall and the surrounding rock to resist the water pressure. The steel wire rope is sheathed with a rubber tube to tighten the inner wall steel bar and the rubber tube The restraint stress is weakened and cracks are avoided. The outer wall and the surrounding rock are connected by bolts to jointly resist freezing pressure and support the weight of the shaft wall.

2. In the present invention, the inner wall is subjected to water pressure and the wire rope pulling force (provided by the outer wall and surrounding rock) together, the wire rope pulling force can offset part of the inner wall of the water pressure, reduce the external load of the well wall design, thereby thin the inner well wall thickness.

Description of the drawings

Figure 1 is a schematic structural diagram of a new type of rooting and anchoring double-layer shaft wall for mining of the present invention;

Figure 2 is a schematic structural diagram of the anchoring member of the new type of rooting and anchoring double-layer shaft wall for mine of the present invention;

Fig. 3 is a schematic view of another structure of the anchoring member of the new type of rooting and anchoring double-layer shaft wall for mine of the present invention;

Figure 4 is a structural schematic diagram of the locking plate of the new type of rooting and anchoring double-layer shaft wall for mines of the present invention;

Fig. 5 is a schematic diagram of the shaft structure of the new type of rooting and anchoring double-layer shaft wall for mine of the present invention when it is applied in a freezing method.

The reference signs in the figure are indicated as: 1-surrounding rock; 2-outer shaft wall; 3-inner shaft wall; 4-rib mesh for outer shaft wall; 5-rib mesh for inner shaft wall; 6-anchoring member; 7 -Anchor rod; 8- first nut; 9- first anti-pull plate; 10- second anti-pull plate; 11- second nut; 12- locking plate; 13- steel wire rope; 14- bolt locking hole; 15-Wire rope locking hole; 16-Freezing tube.

Detailed ways

As shown in Figure 1, the new type of rooting and anchoring double-layer shaft wall for mines of the present invention includes a double-layer shaft wall and an anchoring member 6. The first end of the anchoring member 6 is set in the surrounding rock 1. The second end of the member 6 is fixedly connected with the double-layer well wall, and a plurality of the anchoring members 6 are provided on the double-layer well wall along the circumference of the double-layer well wall. Wherein, the double-layer shaft wall includes an outer shaft wall 2 and an inner shaft wall 3, the anchoring member 6 includes an anchor rod 7 and a wire rope 13; the first end of the anchor rod 7 is arranged on the surrounding rock outside the outer shaft wall 2 In 1, the second end of the anchor rod 7 is connected to the outer shaft wall inside the outer shaft wall 2 with a reinforcement mesh 4; the first end of the steel wire rope 13 is connected to the second end of the anchor rod 7 and the steel wire rope 13 The second end is connected to the inner shaft wall in the inner shaft wall 3 with a rib mesh 5, and the steel wire rope 13 between the first end of the steel wire rope 13 and the second end of the steel wire rope 13 is covered with an elastic material The elastic material tube is a rubber tube, and the rubber tube can weaken the restraint of the steel wire 13 on the inner shaft wall 3, and prevent the inner shaft wall 3 from cracking due to restraining stress; the outer shaft wall 2 A water-proof plastic plate is provided between the inner shaft wall 3 and the inner shaft wall 3; on the outer shaft wall 2, the distance between two adjacent anchor rods 7 in the same horizontal circumferential direction of the outer shaft wall 2 The distance between the two bolts 7 connected in the axial direction of the outer shaft wall 2 is 2m, and the two distances can be adjusted according to the actual application environment and the characteristics of the bolt 7. In this embodiment, the first end of the anchor rod 7 is fixedly connected to the surrounding rock 1 through an anchoring agent; the anchor rod 7 located in the surrounding rock 1 has a length of 1 m.

In this embodiment, the second end of the anchor rod 7 is fixedly connected to the outer shaft wall with a rib mesh 4 through a blocking member. Wherein, as shown in Figures 2 and 3, the locking member includes a first nut 8, a second nut 11, a first anti-pull plate 9 and a second anti-pull plate 10; the second end of the anchor rod 7 passes through in turn The first nut 8, the first anti-pull plate 9, the second anti-pull plate 10 and the second nut 11 are connected to the first end of the wire rope 13, and the second end of the anchor rod 7 Are respectively connected with the first nut 8 and the second nut 11; when the first nut 8 and the second nut 11 are respectively screwed in and tightened toward the rib net 4 close to the outer shaft wall, The first anti-pull plate 9 is arranged on the outer side of the outer shaft wall rib net 4, and the second anti-pull plate 10 is arranged on the inner side of the outer shaft wall rib net 4. The locking member further includes a lock, the second end of the anchor rod 7 is connected to the first end of the wire rope 13 through the lock, the lock includes a locking plate 12, and the locking plate 12 is provided with There are wire rope locking holes 15 and anchor rod locking holes 14 passing through the upper and lower surfaces of the locking plate 12, as shown in FIG. 4; at the first end of the wire rope 13 and the anchor rod 7 When the two ends are connected by the lock, the first end of the wire rope 13 is arranged in the wire rope locking hole 15, and the second end of the anchor rod 7 is arranged in the anchor rod locking hole 14. In this embodiment, one of the anchoring members 6 is provided with five wire ropes 13, and the wire rope locking holes 15 are arranged at equal intervals along the circumferential direction of the anchor rod locking hole 14, and each of the anchoring members In the component 6, three locking plates 12 are used to connect the second end of the anchor rod 7 and the first end of the steel wire rope 13. In order to use the anchor rod 7 to squeeze the wire rope 13 to achieve a fixed connection between the second end of the anchor rod 7 and the first end of the wire rope 13 by the locking plate 12, and only the locking is used The plate 12 can achieve a stable connection between the second end of the anchor rod 7 and the first end of the wire rope 13. In this embodiment, the wire rope locking hole 15 and the anchor rod locking hole 14 are in the anchor The rod locking hole 14 communicates radially; when the first end of the wire rope 13 is set in the wire rope locking hole 15 and the second end of the anchor rod 7 is set in the anchor rod locking hole 14, The first end of the wire rope 13 is in contact with the second end of the anchor rod 7.

When the freezing method is used for sinking the deep soft rock section, the anchor rod 7 is used to anchor the outer shaft wall 2 and the surrounding rock 1. The specific operations are as follows: a. Before pouring the concrete of the outer shaft wall 2 After the outer shaft wall is tied with the rib net 4, use a bolt drill to penetrate the outer shaft wall rib net 4 to drive a φ22 high-strength anchor rod into the surrounding rock 1. The second end of the anchor rod 7 Staying in the outer shaft wall 2, the first end of the anchor rod 7 is bonded to the surrounding rock 1 in the surrounding rock 1 through an anchoring agent, thereby realizing the anchor connection between the outer shaft wall 2 and the surrounding rock 1. At this time, the first end of the anchor rod 7 is located on the inner side of the cylindrical shape enclosed by the freezing pipe 16, as shown in FIG. 5; b, on the second end of the anchor rod 7 on the outer side of the outer shaft wall rib net 4 Install the first nut 8 and the first anti-pull plate 9 in sequence, and then install the second anti-pull plate on the second end of the anchor rod 7 on the inner side of the rib net 4 for the outer well wall 10 and the second nut 11, the purpose of installing the first anti-pull plate 9 and the second anti-pull plate 10 is to enhance the anti-pull ability of the anchor rod 7 to prevent the anchor rod 7 from being Slippage occurs between the outer shaft wall 2 and the surrounding rock 1. When the first nut 8 and the second nut 11 are respectively screwed in and tightened close to the outer shaft wall with the reinforcement mesh 4, the The first anti-pull plate 9 is arranged on the outer side of the outer shaft wall rib net 4, and the second anti-pull plate 10 is arranged on the inner side of the outer shaft wall rib net 4, that is, the first anti-pull plate 9 and The size of the second anti-pull plate 10 is larger than the gap of the rib net 4 for the outer shaft wall; c, five steel wire ropes 13 with a diameter of 20 mm are installed on the second end of the anchor rod 7 by using the three locking plates 12 , So that the second end of the anchor rod 7 is fixedly connected to the first end of the wire rope 13, the wire rope 13 is made of 304 stainless steel, which improves the corrosion resistance of the wire rope 13 to groundwater; d, install the outer The pouring template of the shaft wall 2 is provided with a small hole for the wire rope 13 to pass through, and the first end of the wire rope 13 is placed before pouring the outer shaft wall 2 Pull from the outer side of the pouring template of the outer shaft wall 2 to the inner side of the pouring template of the outer shaft wall 2 through small holes; e, pouring the outer shaft wall 2.

After the outer shaft wall 2 is poured, the inner shaft wall rib net 5 is bundled, and then the second end of the steel wire rope 13 is stretched and locked on the inner shaft wall rib net 5, and then the construction is laid normally The water-proof plastic board between the inner well wall 3 and the outer well wall 2 is used. After the water-proof plastic board is laid, the concrete of the inner well wall 3 is poured. Wherein, the specific operation method for tensioning and locking the second end of the steel wire rope 13 on the rib net 5 for the inner shaft wall is: first winding the second end of the wire rope 13 on the rib net 5 for the inner shaft wall Then, the steel wire rope 13 is stretched with a steel wire rope tensioning machine, and the steel wire rope 13 is tightly connected with the circumferential steel wire of the inner shaft wall rib net 5, and then 5-6 bolt locking mechanisms are installed (Such as a wire rope clamp), lock the wire rope 13 tightly.

In the present invention, the outer shaft wall 2 adds the anchor rod 7 anchored into the surrounding rock 1 by the outer shaft wall 2, and the second end of the anchor rod 7 is embedded inside the outer shaft wall 2, and Because the anchor rod 7 has a certain shear strength, it can bear the weight stress of part of the shaft wall, which reduces the height of the hanging section of the outer shaft wall 2 in the design, and therefore can reduce the rib net of the outer shaft wall. 4 vertical reinforcement. Calculated in accordance with the "Code for Design of Coal Mine Shaft Shaft and Chamber-GB50384-2016" in this field. The specification value is 15-20m, which means that the vertical reinforcement of the external shaft wall reinforcement network 4 must be able to bear The weight of the outer shaft wall 2 of 15-20 m. After using the present invention, after calculation, the anchor rod 7 can fully bear the weight of the outer shaft wall 2 inside the section height. The inner shaft wall 3 is subjected to water pressure and the steel wire rope 13 pulling force, the outer shaft wall 2 and the surrounding rock 1 provide a common effect, and the wire rope 13 pulling force can offset part of the water pressure on the inner shaft wall 3 , Reduce the design external load of the shaft wall, thereby reducing the thickness of the inner shaft wall 3. In this embodiment, the thickness of the inner wall of the coal mine shaft wall using the new type of rooting and anchoring double-layer shaft wall for mines of the present invention can be reduced by 19.8%. The thickness can be reduced by 23.2%. The present invention is based on the shaft wall design theory. The outer shaft wall 2 uses a flexible material (such as the wire rope 13) to connect the inner shaft wall 3 so that the inner shaft wall 3 is connected to the outer shaft wall 2 The rocks 1 are connected together to resist water pressure. The steel wire rope 13 is sheathed with a rubber tube to tighten the inner shaft wall rib net 5, and the rubber tube weakens the restriction of the steel wire rope 13 on the inner shaft wall 3 Stress avoids cracks in the inner shaft wall 3, and the outer shaft wall 2 and the surrounding rock 1 are connected by the anchor rod 7, which can jointly resist freezing pressure and support the weight of the shaft wall.

Obviously, the above-mentioned embodiments are merely examples for clear description, and are not intended to limit the implementation. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. There is no need and cannot exhaust all the implementation methods. The obvious changes or changes derived from this are still within the protection scope of the claims of this patent application.

Claims

A new type of rooting and anchoring double-layer shaft wall for mines is characterized in that it comprises a double-layer shaft wall and an anchoring member (6). The first end of the anchoring member (6) is arranged in the surrounding rock (1), The second end of the anchoring member (6) is fixedly connected to the double-layer well wall, and a plurality of the anchoring members (6) are provided on the double-layer well wall along the circumference of the double-layer well wall; The double-layer shaft wall includes an outer shaft wall (2) and an inner shaft wall (3). The anchoring member (6) includes an anchor rod (7) and a wire rope (13); the first end of the anchor rod (7) is provided In the surrounding rock (1) outside the outer shaft wall (2), the second end of the anchor rod (7) is connected to the outer shaft wall in the outer shaft wall (2) with a reinforcement mesh (4); the steel wire rope (13) The first end of the anchor rod (7) is connected with the second end, and the second end of the steel wire rope (13) is connected with the inner shaft wall in the inner shaft wall (3) with a rib mesh (5); Water-proof plastic plates are arranged between the outer well wall (2) and the inner well wall (3).
The new type rooting and anchoring double-layer shaft wall for mines according to claim 1, characterized in that the second end of the anchor rod (7) is fixedly connected to the outer shaft wall with a rib mesh (4) through a blocking member.
The new type mine rooting and anchoring double-layer shaft wall according to claim 2, wherein the locking member includes a first nut (8), a second nut (11), a first anti-pull plate (9) and The second anti-pull plate (10); the second end of the anchor rod (7) passes through the first nut (8), the first anti-pull plate (9), and the second anti-pull plate ( 10) and the second nut (11) are connected to the first end of the wire rope (13), and the second end of the anchor rod (7) is respectively connected to the first nut (8) and the second nut ( 11) Connection; when the first nut (8) and the second nut (11) are respectively screwed in and tightened to the rib mesh (4) close to the outer shaft wall, the first anti-pull plate (9) It is arranged on the outer side of the outer shaft wall rib net (4), and the second anti-pull plate (10) is arranged on the inner side of the outer shaft wall rib net (4).
The new type rooting and anchoring double-layer shaft wall for mines according to claim 3, wherein the locking member further comprises a lock, and the second end of the anchor rod (7) is connected to the steel wire rope through the lock (13) The first end is connected.
The new type mine rooting and anchoring double-layer shaft wall according to claim 4, characterized in that the lock buckle includes a locking plate (12), and the locking plate (12) is provided with a through the locking plate (12). The wire rope locking holes (15) and anchor rod locking holes (14) on the upper and lower surfaces of the plate (12); at the first end of the wire rope (13) and the second end of the anchor rod (7) When connected by the lock, the first end of the wire rope (13) is arranged in the wire rope locking hole (15), and the second end of the anchor rod (7) is arranged in the anchor rod locking hole ( 14) Within.
The new type rooting anchorage double-layer shaft wall for mines according to claim 5, characterized in that, when the steel wire ropes (13) in one anchoring member (6) are greater than or equal to two, the steel wire ropes The locking holes (15) are arranged at equal intervals along the circumferential direction of the anchor rod locking holes (14).
The new type rooting and anchoring double-layer shaft wall for mines according to claim 6, characterized in that the wire rope locking hole (15) and the bolt locking hole (14) are in the bolt locking hole (14) Communicate in the radial direction; when the first end of the wire rope (13) is set in the wire rope locking hole (15) and the second end of the anchor rod (7) is set in the anchor rod locking hole ( In 14), the first end of the steel wire rope (13) is in contact with the second end of the anchor rod (7).
The new type mine rooting and anchoring double-layer shaft wall according to any one of claims 1-7, wherein the first end of the anchor rod (7) is fixedly connected to the surrounding rock (1) through an anchoring agent; The length of the bolt (7) in the rock (1) is 0.8-1.2m.
The new type of mine rooting and anchoring double-layer shaft wall according to claim 8, characterized in that, when the freezing method is adopted for sinking the shaft, the first end of the anchor rod (7) is located in the cylinder enclosed by the freezing pipe (16)形内。 Inner side.
The new type mine rooting and anchoring double-layer shaft wall according to any one of claims 1-7, characterized in that it is located between the first end of the wire rope (13) and the second end of the wire rope (13). The steel wire rope (13) is covered with an elastic material tube.