CN105937400B - It is a kind of once to tunnel Liu Sheshuan lanes digging operation production line - Google Patents

Abstract

Liu Sheshuan lanes digging operation production line is once tunneled the invention discloses a kind of, after the digging of support in gateway of coal mining face driving Shi Dan lanes immediately following face rear portion by the artificial coal column supporting of placing concrete mid-board by single lane be divided into side be crossheading, opposite side be two tunnels of gob side entry retaining, setting development machine, adhesive tape discharge refuse transporter in two tunnels；What the face rear portion was equipped with connection crossheading and gob side entry retaining connects lane, crossheading, gob side entry retaining collectively form U-shaped ventilation with lane is connected, setting advance support automatic moving type template hydraulic pressure is tried to stop people from fighting each other suspension device in connection lane, and advance support automatic moving type template hydraulic pressure suspension device rear end of trying to stop people from fighting each other is docked with mid-board.This once tunnels Liu Sheshuan lanes digging operation production line and is easy to construction, safe and reliable, cost-effective, not only the digging of gob side entry retaining and back production crossheading and supporting construction are completed, and can realize dash, it can meet lead abutment pressure and adopt the requirement of the multiple mining influence of rear surge pressure.

Description

A mining operation production line with double lanes reserved for one excavation

technical field

The invention relates to a production line for one-time coal mine excavation, in particular to a production line for one-time excavation with double-lane excavation, which is suitable for pouring concrete and filling walls in mining roadways, up and down mountain roadways and other mining areas in underground mines, belonging to underground coal mines field of mining technology.

Background technique

The method of retaining entry along the edge of the goaf at the original trough position is called entry entry retention along the goaf. Retention of roadway includes wide coal pillar, narrow coal pillar and no coal pillar mining technology. In order to reduce the loss of coal pillar between the track roadway and the transportation roadway in the coal seam mining area, and improve the recovery rate of coal resources, no coal pillar mining technology can be adopted. That is, during the coal mining process, the coal pillars of the roadway are not left, but the mining technology of maintaining the roadway in other ways.

At present, gobside entry retention includes reinforced concrete support maintenance roadway, filling belt maintenance roadway, intensive support maintenance roadway, pile maintenance roadway, flexible mold filling body, etc., and its essence is to use wooden piles, Masonry gangue belts, concrete filling and other methods are used to keep the roadway and use it as the recovery roadway of the next mining face. However, these traditional gob-side roadway retention technologies have the following disadvantages: ① high cost, poor applicability, complicated process, cutting Poor roofing effect, severe wall slabs, poor stability, and large consumption of pit wood; ② Poor roadway ventilation during mining roadway excavation affects construction continuity, large coal dust inhalation by workers, and difficult discharge of blast holes; ③ Adopt tight The method of filling the concrete wall beside the roadway with the mining face will affect the normal production of the mining face and interfere with each other; ④ manual filling of the pouring concrete wall often requires formwork and formwork removal, which increases the labor intensity of workers, and there is no movable Pouring formwork; ⑤During the coal seam mining, the coal face is affected by the advanced bearing pressure, and the roadway is severely deformed, causing the roadway to be crushed or the filling wall to be severely squeezed and deformed into the goaf or the roadway or even violently Sliding phenomenon, the net section of the roadway is reduced, affecting the normal use of the roadway, the repair work is difficult, and it affects auxiliary transportation and ventilation.

In order to solve the above problems, the main methods of existing reinforcement and masonry filling walls are: using high-grade high-strength cement, improving the material configuration of the filling wall, and adding single hydraulic supports (concrete support, wooden pillars) to the outside of the filling wall. ) and other means, although these means can partially improve the deformation and slippage of the filling wall, but they cannot solve the problem fundamentally, and they all belong to passive support technology methods; in addition, in terms of ventilation, the existing technology still uses traditional local fan ventilation The method, that is, the wind into the air duct and the sewage out of the roadway, cannot solve the ventilation problem. Therefore, how to effectively control and ensure the safety and stability of the filled concrete wall, reduce the deformation of the wall, improve its self-supporting capacity, and solve the problem in essence. Problems such as roadway ventilation difficulties are major safety production technical problems that need to be continuously resolved.

In short, the existing gob-side retaining technology is still unreasonable in terms of wall construction and support design ideas and ventilation issues. Most roadway construction either separates gob-side retaining and tunneling and cannot make reasonable use of a transport Belt gangue removal, or the excavation of the pre-mining roadway in the mining face and the post-mining roadway are independent of each other, and the construction of the gob-side roadway and along the trough is not regarded as an overall system project, which cannot be considered comprehensively, resulting in the wall of the gob-side roadway retaining ahead of time. Under the influence of bearing pressure and post-mining peak pressure, the roadway cannot be used normally, so that the effect of gob-side entry retention cannot reach the expected effect, and even the repair cost is much higher than the cost of tunneling and setting coal pillars.

Contents of the invention

In view of the above problems, the present invention provides a double-lane excavation production line for one-time excavation, which can realize easy construction, safety and reliability, and cost savings. It can provide a larger overall support strength of gob-side entry retaining support and realize roadway ventilation, which can meet the requirements of multiple mining influences of advanced bearing pressure and post-mining peak pressure.

In order to achieve the above purpose, a double-lane excavation production line is reserved for this excavation. When the roadway is excavated in the mining face, the single lane is excavated and followed by the middle partition wall supported by the concrete artificial coal pillar at the back of the face to divide the single lane. One side is the trough, and the other side is two roadways with gob-side entry retention. Tunneling machines and belt gangue conveyors are installed in the two roadways; Connecting lanes, troughs, gob-side retaining lanes and connecting lanes together form a U-shaped ventilation. Advance support self-moving formwork hydraulic frame support devices are installed in the connecting lanes, and the rear end of advance support self-moving formwork hydraulic frame support devices Docked with the middle partition wall, the self-moving formwork hydraulic frame support device includes ∏-type filling and perfusion movable formwork, middle partition wall advance support self-moving hydraulic support and movable scraper machine; ∏-type filling and perfusion movable The type formwork includes a formwork side on the side and a formwork front on the front, a grouting hole with a one-way grout baffle is provided on the formwork side, and a formwork door is provided on the formwork front.

As a further improvement of the present invention, the ∏-shaped filling and pouring movable formwork is built with a reinforcing net in the middle partition wall, and is suspended on the anchor net or anchor rod of the roof of the roadway by hanging iron wires.

As a further improvement of the present invention, the reinforcing mesh in the partition wall is a plastic mesh, or a fiber mesh, or a steel mesh, or a steel fiber mesh.

As a further improvement of the present invention, a sliding device against displacement and deformation of the wall and a prestressed anchoring device arranged in the horizontal direction are provided in the partition wall.

As an embodiment of the sliding device for resisting wall displacement and deformation of the present invention, the sliding device for resisting wall displacement and deformation includes a top plate anti-slip reinforcement anchor, a bottom plate anti-slide reinforcement anchor, and a roof anti-slide reinforcement anchor drill hole , Bottom plate anti-skid reinforcement bolt drilling, top plate reaming, bottom plate reaming, top and bottom butt joint casing, Type reinforcing ribs, binding iron wires and transverse reinforcement bars; roof anti-slip reinforcement anchors, roof anti-slide reinforcement anchors drilling, top plate reaming corresponding to the partition wall set on the top plate; bottom plate anti-slip reinforcement anchors, bottom plate anti-slip Reinforcement bolt drilling and bottom plate reaming are set on the bottom plate corresponding to the middle partition wall; Type ribs are set to multiple pieces, multiple pieces Type stiffeners are symmetrically arranged vertically and fixed by binding iron wires, and multiple pieces The type reinforcing rib is connected with the top plate anti-slip reinforcement anchor rod and the bottom plate anti-slide reinforcement anchor rod through the top-bottom butt joint sleeve; between the ribs.

As an embodiment of the prestressed anchoring device arranged in the horizontal direction of the present invention, the prestressed anchoring device arranged in the horizontal direction is a pre-tensioned prestressed anchoring device, including pre-tensioned threaded ties, pre-tensioned ties sleeves , pre-tensioning anchors or nuts, grout stoppers and butt short anchor rods; the pre-tensioning thread ties are arranged horizontally, and the two ends of the pre-tensioning thread ties are connected to the butt joints passing through the side of the template through the pre-tensioning sleeves Short anchor connection, the butt short anchor is fixed and installed on the side of the formwork through the grout gasket and pre-tensioned anchors or nuts.

As a further improvement of the present invention, a self-moving hydraulic support, a single pillar, or a steel arch shed support is provided in the gob-side entry retaining.

As a further improvement of the present invention, the longitudinal section of the partition wall is rectangular, or trapezoidal, or slightly arched.

Compared with the existing technology, the double-lane excavation operation production line is reserved for one excavation. ① One roadway is excavated and the roadway is divided into two, which is very beneficial to improve ventilation during excavation;

② Excavating one less mining roadway, saving a lot of human resources, reducing the preparation time of the coal mining face, and alleviating the tension of mining work;

③ Sectional coal pillars are canceled, and concrete wall structures are artificially constructed to fully realize coal pillar-free mining, improve coal recovery rate, and fully develop valuable coal resources;

④ The partition wall of the concrete artificial wall adopts two major systems, the sliding device to resist the displacement and deformation of the wall and the pre-tensioning method prestressed anchoring device in the horizontal direction, which provide higher rigidity and compactness of the partition wall. Support and maintain the stability of the roof and floor well, better resist multiple mining effects of advanced bearing pressure and post-mining peak pressure, still keep the wall stable, and reduce spontaneous combustion;

⑤The pouring concrete in the partition wall adopts ∏-shaped filling and pouring movable formwork, which eliminates the link of formwork erection and formwork removal, reduces labor intensity of workers, and saves process connection time;

⑥The concrete pumping station can be located in the gob-side entry retention, and it is towed by the self-moving hydraulic support for the advance support of the gob-side entry retention. It does not need to be manually moved by means of chain reversing, which reduces labor intensity and improves efficiency. The operation is simple, convenient, safe and reliable .

⑦Through the implementation of the present invention, the entire wall and the top and bottom plates are combined into a whole, effectively controlling the deformation of the surrounding rock of the roadway, improving the overall stability of the concrete artificial wall, and ensuring the successful retention of the gob-side roadway after mining at the working face, which is safe. practical.

Description of drawings

Fig. 1 is a schematic diagram of the plane layout structure when the present invention adopts the tunneling mode;

Fig. 2 is a schematic diagram of the plane layout structure when the present invention adopts the second driving mode;

Fig. 3 is the front schematic view of the concrete section to be filled, the C-C section schematic diagram of Fig. 1 and Fig. 2 of the present invention;

Fig. 4 is the front schematic view of the filled concrete section of the present invention, the D-D cross-sectional schematic diagram of Fig. 1 and Fig. 2;

Fig. 5 is the A-A sectional schematic diagram of Fig. 3;

Fig. 6 is the B-B section schematic diagram of Fig. 3;

Fig. 7 is a three-dimensional structural schematic diagram of the Π-type filling and perfusion movable formwork of the present invention.

In the figure: 1, anchor cable, 2, top anchor, 3, roof net, 4, side anchor, 5, side net, 6, roof anti-slip reinforcement anchor, 7, floor anti-slip reinforcement anchor, 8 1. Top plate anti-skid reinforcement bolt drilling, 9. Bottom plate anti-slip reinforcement bolt drilling, 10. Top plate reaming, 11. Bottom plate reaming, 12. Top-bottom butt joint sleeve, 13. Type reinforcement, 14, binding iron wire, 15, transverse reinforcement, 16, pre-tensioned threaded ties, 17, pre-tensioned ties casing, 18, pre-tensioned ties anchors or nuts, 19, grout stop gasket , 20. Reinforcement net inside the partition wall, 21. Π-type filling and pouring movable formwork, 21-1. Formwork side, 21-2. Formwork front, 22. Grouting hole, 23. One-way grouting baffle, 24. The side of the formwork faces the perforation, 25. Hanging iron wire, 26. The middle partition wall has been poured, 27. The self-moving hydraulic support for the advance support of the gob-side entry, 28. The self-movable hydraulic support for the advance support of the middle partition wall, 28-1, top and bottom plate support jack, 28-2, bottom support plate, 28-3, formwork horizontal stretching jack, 28-4, top push, 28-5, top support plate, 29, movable scraper machine , 30. Gangue belt conveyor, 31. Horizontal ribs, 32. Longitudinal ribs, 33. Roadheader, 34. Butt short bolts, 35. Gob-side retaining, 36. Slot, 37. Partition Wall, 38, continuous mining face, 39, working face to be mined, 40, formwork door.

Detailed ways

The setting of gob-side roadway for mining without coal pillars has to go through five stages: excavation of the roadway, stability of the roadway after excavation, influence of disturbance of backing pressure in advance of mining, peak value of backing pressure after mining, and recovery of post-mining pressure. In the U-shaped ventilation of the present invention, " The gob-side entry + middle partition wall + parallel channel” is used to set up double-entry and support methods in one excavation. The gob-side entry, the concrete artificial coal pillars beside the entry, and the mining trough are considered as a whole and excavated together. During the excavation along the tunnel, the gob-side entry is used as the sewage air tunnel during the excavation, and it is also used as the auxiliary transportation roadway adjacent to the tunnel during the mining period. In the coal mining stage of the next section, it is reserved as the gob-side entry and used as the mining tunnel. .

In the U-shaped ventilation of the present invention, the specific method of setting up double lanes and supporting methods in one-time excavation of "gob-side retaining + middle partition wall + along the trough" is to make specific arrangements for roadway excavation in the mining face roadway excavation stage: After a roadway is excavated, a roadway divided into two is adopted. One side is a gob-side entry, and the other side is a gob-side entry. The wall divides the single lane into double lanes, concrete artificial coal pillars are poured between the double lanes, 1 to 3 roadheaders excavate, a belt conveyor discharges gangue, U-shaped ventilation, and the partition wall is set to resist the displacement, deformation and sliding of the wall The two major systems of the device and the horizontal pretensioning method prestressed anchorage device can limit the displacement and dislocation between the partition wall and the roof and floor, improve the overall strength of the wall, improve the ability of the wall to resist sliding deformation, and strengthen The stability performance of the wall, especially under the influence of the mining support pressure and the uneven stress of the roof during the mining period, can effectively prevent the deflection deformation and dislocation slip on both sides of the wall, and greatly control the deformation of the roof, floor and side. , to ensure the effective cross-section of the roadway; during the excavation of the double roadway, the U-shaped ventilation mode is formed by the connecting channel of the tunnel face and the gob-side entry, which overcomes the disadvantages of single-headed ventilation. The partition wall between the double lanes is used as a concrete artificial coal pillar, and the gob-side retaining entry can be used as an auxiliary transportation roadway during the mining of the previous mining face, and can be used as a trough during the mining of the next face. The alley side of the alley is used to support the wall.

The key problem in the embodiment of the present invention depends on the support method and support process selected by concrete artificial coal pillars. Under the influence of multiple mine pressure disturbances, it is necessary to ensure that the gob retaining can resist the mining pressure of the roadway. It can continue to be used without maintenance, ensuring the normal continuous production of the working face.

An embodiment of the present invention is further described below in conjunction with accompanying drawing:

As shown in Fig. 3 and Fig. 4, the frontal layout of the concrete section to be filled and the filled concrete section of "gob-side entry + middle partition wall + slot" in the present invention's one-time excavation with double entry and support method is shown. Fig. 5 and Fig. 6 show the side layout of each component structure assembly of the "advance support section, the concrete section to be filled and the filled concrete section" in the double lane left in one excavation of the present invention, as shown in Fig. 1 and Fig. 2 The present invention "gobside retaining + central partition wall + along the channel" in a single excavation to leave the mid-plane layout structure layout of double lanes.

The excavation section of the roadway shown in the figure is a rectangular section, which is arranged along the entire length of the roadway excavation direction from the stop-mining line to the incision hole. The middle partition wall 37 is set, the left side is the mining trough 36, and the right side is the gob-side entry 35, which is the trough of the mining face in the next section. + Top bolt 2 + Roof net 3, and the anchor net is arranged on the two sides of the roadway, that is, side bolt 4 + side net 5.

The middle partition wall 37 in the middle of the roadway is used as the side road side support structure of the mining trough 36 and the gob-side retaining roadway 35, and jointly supports the roof for pressure.

The direction of section C-C and section D-D is from the production stop line to the open cut eye, and the direction of section A-A and section B-B is from the gobside entry 35 to the ditch 36 .

As shown in Figures 1 to 7, in the U-shaped ventilation of the present invention, a double-entry support structure is left in one excavation of "goblin entry + middle partition wall + trough", including anchors for gob entry 35 and trough 36 In addition to the cable support, it is mainly a partition wall structure. The partition wall 37 structure includes a cloth sliding device system for resisting wall displacement and deformation, a horizontal pretensioning method prestressed anchoring device system, and a reinforcement net 20 in the partition wall. Poured concrete, wherein the sliding device system for resisting wall displacement and deformation consists of top plate anti-slip reinforcement anchor rod 6, bottom plate anti-slide reinforcement anchor rod 7, roof anti-slide reinforcement anchor rod drilling 8, bottom plate anti-slide reinforcement anchor rod drilling hole 9, Top plate reaming 10, bottom plate reaming 11, top and bottom butt joint sleeve 12, type reinforcing rib 13, binding iron wire 14 and transverse reinforcing rib 15; the horizontal direction pre-tensioning method prestressed anchorage device system includes pre-tensioning threaded rib 16, pre-tensioning rib sleeve 17, pre-tensioning anchor or A nut 18, a grout stop washer 19 and a butt short anchor rod 34 are formed.

Resistance to wall displacement and deformation The sliding device system can effectively limit the horizontal cracking and deformation of the partition wall and the displacement and misalignment between the partition wall and the roof and floor, improve the overall strength of the partition wall, and improve the anti-slip of the wall ability to shift shape.

The ultimate tensile strain capacity of the commonly used filling wall is limited, and the concrete cracking and "packing" phenomenon are prone to occur in the tension area under the mining pressure of the overlying rock. Even the damage deepens. In order to overcome the disadvantages that the premature cracks of the ordinary filling wall are inconsistent with the deformation of the internal steel bars and cannot play a role, the present invention adopts the pretensioning method prestressed anchorage device system to make the internal structure of the overall concrete of the partition wall under tension. The tension in the horizontal direction is given to the pre-tensioned thread tie bars in advance, and the reverse shrinkage elastic force of the steel bars is applied to the concrete, so that the concrete in the partition wall is subjected to a pre-tightening compressive stress, causing it to produce a certain extrusion deformation, among which After the partition wall is subjected to the mining pressure, the tensile strain and the compressive strain in the pressure area first cancel each other out, and then with the increase of the mining pressure, the concrete of the partition wall is gradually stretched, which greatly controls the partition wall. The deformation of the side of the wall can effectively improve the rigidity, cracking performance and durability of the overall component of the partition wall. Compared with the common filling wall, the partition wall of the present invention has the advantages of thin thickness, small interface, and material saving. advantage.

In the U-shaped ventilation of the present invention, the construction method of "gob-side retaining + middle partition wall + along the trough" to leave a double-lane support structure in one excavation is specifically as follows:

a) Tunneling along the tunnel 36 face: After the previous cycle process is completed, two roadheaders are used to excavate the tunnel face. As shown in Figure 1, the tunneling machine 36 along the groove is first used to excavate the movable scraper machine 29 On the face of the front face, the gangue is excavated while being excavated. The gangue removal is assisted by the belt conveyor 30. At the same time, the roof is supported by anchor nets and cables to ensure that no roof fall accidents occur at the end, and the anti-skid reinforcement anchors are drilled into the top and bottom plates. Rod drilling 8 and top plate reaming 10, bottom plate anti-slip reinforcement anchor rod drilling 9 and bottom plate reaming 11, as shown in Figure 3, after cleaning the holes, install the top plate anti-slip reinforcement anchor rod 6 and the bottom plate together with resin anchoring agent The anti-slip reinforcement anchor rod 7 ensures that the anchor rod ends of the top plate anti-slide reinforcement anchor rod 6 and the bottom plate anti-slide reinforcement anchor rod 7 do not expose the top plate and the bottom plate, so as to prevent the tensioning equipment from destroying the anchor rod thread and ensure the normal use of the anchor rod thread, which is convenient The smooth installation of the top and bottom butt joint casing 12 in the later stage;

b) Pull the ∏-shaped filling and pouring movable formwork 21 to the designated position by the advanced support self-moving hydraulic support 28 of the middle partition wall: the construction personnel open the formwork door 40 and enter the interior of the ∏-shaped filling and pouring movable formwork 21, and wait for the After the anchor net cable support in front of the partition wall advance frame 28 and the top plate anti-slip reinforcement anchor rod 6 and the bottom plate anti-slide reinforcement anchor rod 7 are installed and the concrete in the movable formwork 21 is filled and poured in the previous stage to reach the preset strength, First use a wrench or manually unload the pre-tensioned anchors or nuts 18, the grout stopper 19 and the butt short anchor rod 34, then release the pressure on the top and bottom plates to support the jack 28-1, and rely on the template to stretch the jack 28-3 horizontally The front of the formwork 21-2 pushes the middle partition wall forward to support the self-moving hydraulic support 28 as a whole to move forward. After reaching the designated position, the top and bottom plates are supported again to support the jack 28-1, so that the bottom of the top support plate 28-5 The support plate 28-2 at the bottom of the support plate is fully in contact with the top and bottom plates and is under force, and then pulls back the formwork horizontal stretching jack 28-3 and pulls the ∏-shaped filling and pouring movable formwork 21 to reach the pouring position of the next stage, and finally pushes the formwork horizontally The jack 28-4 adjusts the movable scraper 29 to a suitable position;

c) Excavation of the face of the gob-side entry 35: Use the roadheader on the side of the gob-side entry 35 to excavate the coal rock mass at the end, and the coal gangue can be directly dropped to the corresponding movable scraper machine 29 below the roadheader Reprinted to the position at the end of the trough 36, completed by the auxiliary transport of the belt conveyor 30;

d) Installation of sliding device system installed in the middle partition wall to resist displacement and deformation of the wall: when the ∏-shaped filling and pouring movable formwork 21 moves to the corresponding position (as shown in Figure 6), the top and bottom butt joint sleeves 12 are used to place the Type reinforcing rib 13 is connected with top plate anti-slip reinforcement anchor rod 6 and bottom plate anti-slide reinforcement anchor rod 7, and adopts binding iron wire 14 to symmetrically set Type reinforcing ribs 13 are tied together; and horizontal reinforcing ribs 15 with hooks are used to overlap in the horizontal direction Type reinforcing rib 13, the sliding device system for resisting wall displacement and deformation can effectively improve the overall strength of the middle partition wall and improve the ability of the wall to resist sliding and deformation;

e) Installation of the reinforcement net 20 in the partition wall: first lay the reinforcement net 20 in the partition wall along the inner side of the formwork side 21-1, and bind the top of the reinforcement net 20 in the partition wall with the top of the roof by hanging iron wire 25 The anchor rod 2 or the roof net 3 are fixed, and the reinforcement net 20 in the middle partition wall is welded by Φ6 steel mesh;

f) Installation of two major systems of pre-tensioned prestressed anchoring devices in the horizontal direction: inside the ∏-shaped filling and pouring movable formwork 21, pass through the side of the formwork to face the perforation 24, and pass the pre-tensioned threaded ties 16 through the pre-tensioned ties casing 17 Connect with the docked short anchor rod 34, and install a grout stopper 19 and a pre-tensioned tendon anchor or nut 18 at the outer end of the docked short anchor rod 34;

g) Tensioning anchors or nuts 18 prestress application: After the binding and installation of the steel bars of the sliding device for resisting wall displacement and deformation inside the middle partition wall 37 are ready, the personnel withdraw through the formwork door 40 and close the formwork door 40 lock; then prepare to apply prestress to the pre-tensioned threaded ties 16, because the formwork side 21-1 is subject to the restriction of the formwork front 21-2 and the poured partition wall, the pre-tensioned ties anchorage or nut 18 apply prestress;

h) Concrete pouring artificial coal pillars: Concrete pouring equipment is completed by a set of equipment such as concrete mixing station, concrete delivery pump, concrete delivery pipeline, etc. The concrete delivery pump of the equipment is HBMG30/9-45S explosion-proof concrete pump, and the nominal diameter of the pipeline is DN100mm , the concrete mixing station uses MJZC150 mining concrete mixer, which is located in the gob-side entry, pulled by the self-moving hydraulic support 27 for advance support in the gob-side entry, followed by the ∏-type filling and pouring movable formwork 21 for mobile construction , pumping concrete through the grouting hole 22 of the movable formwork 21 through the ∏-type filling and pouring into the concrete partition wall, preventing the grout from being poured back into the concrete delivery pipe during pouring, and installing a one-way grouting baffle at the grouting hole 22 23. It can make the concrete grout "only go in and out"; after the concrete strength reaches the specified requirements, when there is sufficient cohesive force between the pre-tensioned threaded ties 16 and the concrete, remove the butt joint short anchor rod 34 and the pre-tensioned ties Anchors or nuts 18 and grout stoppers 19, after the movable formwork 21 is moved to the next stage for ∏-type filling and pouring, re-install anchors or nuts 18 and supporting plates for pre-tensioned tendons. This installation method does not Affect the normal shifting of the ∏-type filling and pouring movable formwork 21, and pull the frame ∏-type filling and pouring movable formwork 21 to the next pouring position to complete the filling work surface of the poured middle partition wall 26 once; move the gob-side entry Advanced support self-moving hydraulic support 27 to the next process position;

i) Follow the advancement of the tunneling machine 33 on the tunnel face: repeat the above steps to complete the filling and pouring of the poured partition walls 26 one after another, and arrange the sliding device system in the partition wall to resist the displacement and deformation of the wall The surrounding rock mass of the roof and floor and the partition wall are completely combined to form an integral structure, and the shearing, tensile failure and deformation of the surrounding rock are effectively restrained and limited by the pretensioned prestressed anchorage device system in the horizontal direction.

Claims (8)

1. A kind of one-time excavation stays to set up the double lane excavation operation production line, it is characterized in that, the middle partition wall supported by filling concrete artificial coal pillars ( 37) Divide the single roadway into two roadways, one side is the trough (36), and the other side is the gobside retention roadway (35). The two roadways are equipped with roadheaders and belt gangue conveyors; There is a connecting lane connected with the gob-side chute and the gob-side entry at the bottom. The chute (36), the gob-side entry (35) and the gob-side entry together form a U-shaped ventilation, and the advance support self-moving formwork hydraulic frame is set in the connecting lane. The support device, the rear end of the hydraulic frame support device for self-moving formwork for advance support is docked with the middle partition wall; Partition wall advanced support self-moving hydraulic support (28) and movable scraper machine (29); Π-type filling and pouring movable formwork (21) includes formwork side (21-1) located on the side and The formwork front (21-2), the formwork side (21-1) is provided with the grouting hole (22) that has one-way grouting baffle (23), is provided with formwork door (40) on the formwork front (21-2). ). 2. The excavation production line with double lanes left for one excavation according to claim 1, characterized in that, the movable formwork (21) for filling and pouring of the described ∏ type (21) has a built-in reinforcement net (20) in the middle partition wall, and is formed by Hanging iron wire (25) is suspended on the anchor net or anchor rod of roadway roof. 3. The excavation production line with two lanes left in one excavation according to claim 2, characterized in that, the reinforcement net (20) in the partition wall is a plastic net, or a fiber net, or a steel net, or a steel fiber network. 4. The excavation production line with double lanes left in one excavation according to claim 1, characterized in that, the sliding device resisting the displacement and deformation of the wall and the prestressed anchorage arranged in the horizontal direction are arranged in the said partition wall (37) device. 5. The excavation production line with double lanes left in one excavation according to claim 4, characterized in that, the sliding device against displacement and deformation of the wall comprises a roof anti-slip reinforcing anchor (6), a bottom plate anti-sliding reinforcing anchor Rod (7), top plate anti-skid reinforcement bolt hole (8), bottom plate anti-skid reinforcement bolt hole (9), top plate reaming (10), bottom plate reaming (11), top and bottom butt joint sleeve (12) ), Reinforcement ribs (13), binding iron wires (14) and transverse reinforcement bars (15); roof anti-skid reinforcement anchor rods (6), roof anti-slide reinforcement anchor rod drillings (8), and roof reaming holes (10) correspond to The intermediate partition wall (37) is arranged on the top plate; the bottom plate anti-slip reinforcement anchor rod (7), the bottom plate anti-slip reinforcement anchor rod drilling (9), and the bottom plate reaming hole (11) are arranged on the bottom plate corresponding to the intermediate partition wall; Type reinforcing rib (13) is set to many pieces, and many pieces Type reinforcing ribs (13) are vertically arranged symmetrically and are fixed by binding iron wires (14), and multiple The type reinforcing rib (13) is connected with the top plate anti-slip reinforcement anchor rod (6) and the bottom plate anti-slide reinforcement anchor rod (7) through the top and bottom butt joint sleeve (12); Type reinforcing ribs (13). 6. The double-lane excavation production line set aside for one-time excavation according to claim 4 is characterized in that, the prestressed anchoring device arranged in the horizontal direction is a pretensioned prestressed anchoring device, comprising pretensioned threaded ties ( 16), pre-tensioned ties casing (17), pre-tensioned ties anchors or nuts (18), grout stop gasket (19) and butt joint short anchor (34); pre-tensioned threaded ties (16) level Setting, the two ends of the pre-tensioned threaded ties (16) are connected with the butt short anchor rods (34) passing through the formwork side (21-1) through the pre-tensioned ties sleeves (17), and the butt short anchor rods (34) It is fixedly installed on the formwork side (21-1) through a grout stopper (19) and pre-tensioned anchors or nuts (18). 7. According to claim 1 or 4, the excavation production line with two lanes reserved for one-time excavation is characterized in that a self-moving hydraulic support (27) for advance support of gob-side retaining (35) is set , or single pillar, or steel arch shed support. 8. The excavation production line with two lanes reserved for one excavation according to claim 1 or 4, characterized in that the longitudinal section of the partition wall (37) is rectangular, trapezoidal, or slightly arched.