Construction Technology and Equipment of Double-Side Drift Bench Method for Large Cross-Section Stations of Urban Rail Transit

Abstract

This application relates to a double-side drift bench construction technology and its equipment for large cross-section stations of urban rapid rail, belonging to the technical field of station construction. It includes a support device, which comprises: a support bottom plate placed on the bottom wall of the drift; three side plates slidably arranged on the support bottom plate along different sliding directions and used to support the side wall of the drift after extrusion; and a driving mechanism arranged on the support bottom plate and used to drive the three side plates to move simultaneously. In this application, by placing the support bottom plate on the bottom wall of the drift, the driving mechanism is started to drive the three side plates to press against the side wall of the drift for extrusion and then support, and the generated reaction force causes the support bottom plate to extrude the bottom wall of the drift. Therefore, the support and protection effect on the tunnel is improved, thereby enhancing the safety during tunnel excavation.

Description

Technical Field

[0001] This application relates to the technical field of station construction, especially the double-side drift bench construction technology and its equipment for large cross-section stations of urban rapid rail. Background Art

[0002] The double-side drift method is a way of tunnel excavation, also known as the double-side drift tunneling method or the glasses method, which belongs to a branch of the New Austrian Tunneling Method and is based on the basic principle of the New Austrian Tunneling Method. It is a commonly used method in the construction of large cross-section tunnels of urban rapid rail stations.

[0003] When the double-side drift method is adopted, the general form of the excavation surface division is usually to divide the tunnel excavation cross-section into three parts, namely the left drift, the right drift, and the middle drift. During the excavation of the three drifts, generally, the support structure is installed after excavation for support. The support structure usually has a steel reinforcement cage fixedly installed on the side wall of the drift, and then shotcrete is used for support. After the cross-section is excavated, the soil is relatively loose, which reduces the support effect on the tunnel, and thus reduces the safety during tunnel excavation. Summary of the Invention

[0004] In order to improve the safety during tunnel excavation, this application provides the double-side drift bench construction technology and its equipment for large cross-section stations of urban rapid rail.

[0005] In the first aspect, the double-side drift bench construction equipment for large cross-section stations of urban rapid rail provided by this application adopts the following technical solutions:

[0006] The double-side drift bench construction equipment for large cross-section stations of urban rapid rail includes a support device for supporting the drift, and the support device includes:

[0007] A support bottom plate, which is placed on the bottom wall of the drift;

[0008] Three side plates, which are slidably arranged on the support bottom plate along different sliding directions and cooperate to support the side wall of the drift after extrusion;

[0009] A driving mechanism, which is arranged on the support bottom plate and is used to drive the three side plates to move simultaneously.

[0010] By adopting the above technical solution, the supporting bottom plate is placed on the bottom wall of the pilot tunnel, and the driving mechanism is started to drive the three side plates to move, so that the three side plates are pressed against the side wall of the pilot tunnel for extrusion and support. The generated reaction force causes the supporting bottom plate to press against the bottom wall of the pilot tunnel. Therefore, the three side plates and the supporting bottom plate press against the pilot tunnel for extrusion and support, improving the supporting and protecting effect on the tunnel, and thus enhancing the safety during tunnel excavation. The three side plates slide from different directions and press against the tunnel, so the extrusion and support area of the three side plates on the tunnel is increased, further enhancing the safety during tunnel excavation.

[0011] When disassembly is required simultaneously, the driving mechanism is started to drive the three side walls away from the tunnel, and then the support device can be removed. Therefore, the safety of tunnel excavation and the construction efficiency are improved simultaneously.

[0012] Optionally, one of the side plates is a middle plate with both ends abutting against the side walls on the opposite sides of the other two side plates. The driving mechanism includes:

[0013] A push plate, which is slidably arranged on the supporting bottom plate and is slidably connected to the two side plates located on both sides of the middle plate and is used to push the two side plates away from or close to each other;

[0014] A push rod, which is arranged on the push plate and is connected to the middle plate and is used to drive the middle plate to approach or move away from the top wall of the pilot tunnel;

[0015] A driving component, which is arranged on the supporting bottom plate and is used to drive the push plate to move.

[0016] By adopting the above technical solution, the driving component is started to drive the push plate to move. The movement of the push plate drives the two side plates to move away from each other and towards the tunnel. At the same time, the movement of the push plate drives the push rod and the middle plate to move closer to the tunnel. Therefore, the three side plates press against the side wall of the tunnel for support, and at the same time, a reaction force is generated on the supporting bottom plate, causing the supporting bottom plate to press against the bottom wall of the tunnel for support, so as to realize the support and protection of the tunnel.

[0017] Optionally, the driving component includes:

[0018] A fixed pipe, which is arranged on the supporting bottom plate;

[0019] A driving rod, which is arranged on the push plate and is slidably arranged on the fixed pipe;

[0020] A driving ring, which is rotatably arranged on the fixed pipe and is threadedly connected to the driving rod.

[0021] By adopting the above technical solution, rotating the driving ring drives the driving rod to move, and the movement of the driving rod drives the push plate to move, so as to realize rotating the driving ring to drive the push plate to move, and this structure has simple driving and convenient operation.

[0022] Optionally, the side wall of the pilot tunnel that forms the arched side wall of the station tunnel is an arc-shaped side wall. A fixed steel reinforcement cage for pouring concrete is inserted on the side plate close to the arc-shaped side wall. A positioning plate that supports on the arc-shaped side wall is fixedly installed at one end of the fixed steel reinforcement cage away from the side plate. A fixing rod that passes through the positioning plate and is used to fix the positioning plate is fixedly installed on the arc-shaped side wall;

[0023] The middle plate is detachably connected to the push rod, while the side plates at both side positions are detachably connected to the push plate and can be removed from the support bottom plate. A sliding seat detachably connected to the push plate is slidably arranged on the side plate where the fixed steel reinforcement cage is inserted, and a moving component connected to the sliding seat is arranged on the side plate.

[0024] By adopting the above technical solution, the movement of the side plate drives the fixed steel reinforcement cage and the positioning plate to approach the side wall of the pilot tunnel, so that the positioning plate supports after extruding the side wall of the pilot tunnel. Then, the fixing rod passes through the positioning plate and is fixedly installed on the arc-shaped side wall, thereby fixedly installing the fixed steel reinforcement cage on the arc-shaped side wall. Then, the moving component is activated to drive the side plate to move away from the fixed steel reinforcement cage, so that the side plate is separated from the fixed steel reinforcement cage. Then, concrete can be sprayed onto the fixed steel reinforcement cage and part of the steel bars of the fixed steel reinforcement cage are exposed. Then, the moving component is activated to drive the side plate to move back, and the exposed steel bars of the fixed steel reinforcement cage are inserted into the side plate, and the side wall compresses and compacts the concrete. Therefore, the concrete poured on the steel reinforcement cages of multiple arc-shaped side walls is connected together to support the arched side wall of the tunnel. Therefore, the tunnel can still be supported after the support device is removed, and the exposed steel bars are buried during the subsequent shotcrete.

[0025] Therefore, the side plate can compress and compact the concrete. At the same time, when disassembling the support device, the driving mechanism can drive the three side plates to move simultaneously, saving the time spent on disassembly. Moreover, when supporting the middle pilot tunnel, the side plates at both side positions are disassembled, and then the middle plate on the support device is replaced, so that a plate with the same structure as the middle plate and the side plate close to the arc-shaped side wall can support the side wall of the middle pilot tunnel after extrusion, thereby saving the time spent on supporting the pilot tunnel. Therefore, the safety of tunnel excavation and the construction efficiency are improved simultaneously.

[0026] Optionally, the moving component includes:

[0027] Two fixed blocks, the two fixed blocks are arranged on the side plate and the sliding seat extends between the two fixed blocks;

[0028] A moving screw rod, the moving screw rod is rotatably arranged on the two fixed blocks and is threadedly connected to the sliding seat, so that the sliding seat abuts against the opposite side walls of the two fixed blocks for positioning.

[0029] By adopting the above technical solution, the moving screw drives the sliding seat to move, and the movement of the sliding seat drives the side plate to move. At the same time, the sliding seat is pressed against the two fixed blocks for positioning, so that the moving screw drives the side plate to move.

[0030] Optionally, the two side panels facing away from the arc-shaped side wall are both arc-shaped and the distance between the top ends is greater than the distance between the middle positions. When the supporting device supports the middle guide pit, the supporting bottom plate is supported on the side walls on the opposite side of the two side panels for positioning.

[0031] By adopting the above technical scheme, when excavating the middle pilot pit, the middle upper section is first excavated to form a step hole, and then the supporting bottom plate is supported on the step hole and also on the side walls on the opposite side of the two side plates. Then the middle plate moves to squeeze and support the side walls of the middle pilot pit, and then the middle lower section is excavated. Therefore, the two side plates can continue to support the supporting bottom plate, thereby improving the supporting effect of the pilot pit and improving the safety during tunnel excavation.

[0032] Optionally, the support base plate is detachably connected to the bottom wall of the guide pit via a fixing assembly, and the fixing assembly comprises:

[0033] A connecting steel cage, wherein the connecting steel cage is detachably arranged on the lower surface of the supporting bottom plate through a connecting assembly and a portion of the steel bars are inserted into the bottom wall of the guide pit for positioning and pressing against the bottom wall of the guide pit;

[0034] A concrete layer is formed by pouring concrete on the connecting steel cage.

[0035] By adopting the above technical solution, the connecting steel cage is placed on the bottom wall of the guide pit and part of the steel bars are inserted into the bottom wall of the guide pit for positioning, and then concrete is poured on the connecting steel cage to form a concrete layer, thereby improving the stability of the supporting base plate; and when disassembly is required, the supporting base plate is disassembled after unlocking the connecting assembly, which improves the convenience of installing the connecting steel cage on the supporting base plate and disassembling the supporting base plate, thereby improving the safety and construction efficiency of tunnel excavation at the same time.

[0036] Optionally, the connection component includes:

[0037] A connecting screw rod, wherein the connecting screw rod passes through the supporting bottom plate;

[0038] A connecting sleeve is arranged on the connecting steel cage and abuts against the supporting bottom plate, and the connecting screw is threadedly connected to the connecting sleeve.

[0039] By adopting the above technical solution, when pouring concrete, the connecting sleeve is located inside the concrete, so that the connecting sleeve and the connecting reinforcement cage are fixedly connected together to fix the supporting bottom plate. When disassembling, turn the connecting screw to disengage from the connecting sleeve, and then the supporting bottom plate can be removed. Subsequently, the sprayed concrete can bury the connecting sleeve, which facilitates the connection and disassembly of the supporting bottom plate and the connecting reinforcement cage, and improves the construction efficiency during tunnel excavation.

[0040] Optionally, a turning plate is rotatably installed on the supporting bottom plate and is placed on the connecting reinforcement cage. After turning the turning plate away from the connecting reinforcement cage, a pouring port convenient for concrete pouring can be formed, and the turning plate is detachably connected to the connecting reinforcement cage.

[0041] By adopting the above technical solution, when concrete needs to be poured, turn the turning plate away from the connecting reinforcement cage to form a pouring port, and then pour concrete onto the connecting reinforcement cage through the pouring port. Therefore, the convenience of pouring concrete is improved, and at the same time, the situation of incomplete concrete pouring is reduced. Therefore, the construction efficiency and quality of the tunnel are improved at the same time; moreover, when installing the connecting reinforcement cage, connect the turning plate to the connecting reinforcement cage. Therefore, while meeting the requirements of improving construction efficiency and quality, the adverse impact of setting the turning plate on the stability between the connecting reinforcement cage and the supporting bottom plate is also reduced.

[0042] In the second aspect, the construction process of the construction equipment for double-side drift bench construction of large cross-section stations of urban rapid rail provided by the present application adopts the following technical solution:

[0043] The construction process applied to the construction equipment for double-side drift bench construction of large cross-section stations of urban rapid rail as described in any item of the first aspect includes the following process steps:

[0044] S1. Install the grouting pipe and grout. Drill a plurality of grouting holes at intervals along the contour of the arched side wall of the tunnel, install the grouting pipe into the grouting holes and grout.

[0045] S2. Excavate the right drift and install the support device. Excavate the right drift, and then install the support device on the right drift for support and positioning.

[0046] S3. Excavate the left drift and install the support device. Excavate the left drift, and then install the support device on the left drift for support and positioning.

[0047] S4. Excavate the middle drift and install the support device. First, excavate the upper section of the middle drift to form a stepped hole, then remove the side plates at both sides, then place the supporting bottom plate on the stepped hole and press it against the side walls on the opposite side of the two side plates, then install other structures in the support device on the drift, and finally continue to excavate the lower section of the middle drift to achieve the excavation of the entire tunnel.

[0048] S5. Demolish the support device, and then continue to spray concrete to complete the construction of the tunnel.

[0049] By adopting the above technical solution, a plurality of grouting holes are first opened at intervals along the contour of the arched side wall of the tunnel, and then grouting pipes are added into the grouting holes, and grouting is carried out through the grouting pipes, so that the concrete intrudes into the section. Then, the right pilot tunnel is excavated. After excavation, the support device is placed into the right pilot tunnel for support. Then, the left pilot tunnel is excavated. After excavation, the support device is placed into the left pilot tunnel for support. Then, the upper section in the middle pilot tunnel is excavated to form a stepped hole. Then, the upper side plate of the support device is removed. Then, the support device is installed on the stepped hole for support. Then, the lower section of the middle pilot tunnel is excavated, so as to realize the excavation of the tunnel. Finally, the support device is demolished, and then continue to spray concrete to complete the construction of the tunnel.

[0050] In summary, the present application includes at least one of the following beneficial technical effects:

[0051] By placing the support bottom plate on the bottom wall of the pilot tunnel and starting the driving mechanism to drive the three side plates to press against the side wall of the pilot tunnel for extrusion and then support, the generated reaction force causes the support bottom plate to press against the bottom wall of the pilot tunnel, so the support and protection effect on the tunnel is improved, thereby improving the safety during tunnel excavation. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 is a three-dimensional structural schematic diagram of the present application;

[0053] Figure 2 is a structural schematic diagram of the support device in the present application;

[0054] Figure 3 is a structural schematic diagram of the support bottom plate and the connection assembly in the present application, and one of the flip plates and the screw is exploded;

[0055] Figure 4 is a structural schematic diagram of the driving mechanism and the moving assembly in the present application.

[0056] Reference signs: 11, middle pilot tunnel; 12, left pilot tunnel; 13, right pilot tunnel; 14, arc-shaped side wall; 15, fixed steel reinforcement cage; 16, positioning plate; 17, fixed rod; 2, support device; 21, support bottom plate; 212, turning plate; 213, pouring port; 22, side plate; 23, middle plate; 24, left plate; 241, first sliding rod; 25, right plate; 251, second sliding rod; 26, sliding seat; 27, first mounting shaft; 28, second mounting shaft; 29, roller; 3, driving mechanism; 31, push plate; 311, slideway; 32, push rod; 33, driving assembly; 34, fixed pipe; 35, driving rod; 36, driving ring; 4, fixing assembly; 41, connecting steel reinforcement cage; 42, concrete layer; 5, connecting assembly; 51, connecting screw; 52, connecting sleeve; 6, moving assembly; 61, fixed block; 62, moving screw. Detailed implementation manners

[0057] The following further elaborates on the present application with reference to FIGS. 1-4.

[0058] The embodiment of the present application discloses a double-sidewall pilot tunnel bench construction device for a large cross-section station of an urban rapid rail.

[0059] Referring to Figure 1 , the double-sidewall pilot tunnel bench construction device for a large cross-section station of an urban rapid rail includes a support device 2 for supporting the pilot tunnel. The pilot tunnel is divided into a middle pilot tunnel 11, a left pilot tunnel 12 and a right pilot tunnel 13 located on the left and right sides of the middle pilot tunnel 11. After the excavation of the three pilot tunnels, the outline of the station tunnel is formed. The side walls of the pilot tunnels that make up the arched station tunnel are arc-shaped side walls 14. During the excavation, support is carried out while excavating. First, the right pilot tunnel 13 is excavated, then the support device 2 is installed for support and protection. Next, the left pilot tunnel 12 is excavated, and then the support device 2 is installed for support and protection. Then, the upper section of the middle pilot tunnel 11 is excavated to form a step hole, and then the support device 2 is installed. Finally, the lower section of the middle pilot tunnel 11 is excavated.

[0060] Referring to Figure 1 and Figure 2 , the structures and installation methods of the support devices 2 in the left pilot tunnel 12 and the right pilot tunnel 13 are the same. Therefore, the support device 2 in the right pilot tunnel 13 is taken as an example for explanation below. The support device 2 includes a support bottom plate 21. The support bottom plate 21 is placed on the bottom wall of the pilot tunnel, and the lower surface of the support bottom plate 21 is detachably connected to the bottom wall of the pilot tunnel through a fixing assembly 4. The fixing assembly 4 includes a connecting steel reinforcement cage 41 and a concrete layer 42.

[0061] Referring to Figure 2 and Figure 3, the connecting steel reinforcement cage 41 is detachably connected to the lower surface of the supporting bottom plate 21 through the connecting assembly 5. The connecting steel reinforcement cage 41 is formed in a cage shape by bundling multiple steel bars. At the same time, the connecting steel reinforcement cage 41 presses against the bottom wall of the pilot tunnel, and some of the steel bars on the connecting steel reinforcement cage 41 are inserted into the bottom wall of the pilot tunnel for positioning.

[0062] Refer to Figure 2 and Figure 3 , the connecting assembly 5 includes a connecting screw rod 51 and a connecting sleeve 52. The connecting screw rod 51 vertically passes through the upper surface of the supporting bottom plate 21 and extends out of the supporting bottom plate 21. The connecting sleeve 52 is fixedly installed on the connecting steel reinforcement cage 41, and the connecting screw rod 51 is threadedly connected to the connecting sleeve 52. Therefore, the supporting bottom plate 21 is placed on the upper surface of the connecting steel reinforcement cage 41, and the connecting screw rod 51 passes through the supporting bottom plate 21 and is threadedly connected to the connecting sleeve 52, so as to fixedly connect the supporting bottom plate 21 and the connecting steel reinforcement cage 41 together.

[0063] Refer to Figure 2 and Figure 3 , a plurality of casting ports 213 are horizontally spaced apart on the upper surface of the supporting bottom plate 21. A turning plate 212 is rotatably installed on each casting port 213 through a horizontal rotating shaft. One end of the turning plate 212 away from the rotating shaft is placed on the connecting steel reinforcement cage 41. At the same time, a sleeve is also fixedly installed on the connecting steel reinforcement cage 41, and a screw rod passing through the turning plate 212 and threadedly connected to the sleeve is arranged on the turning plate 212, so as to realize the detachable connection between the turning plate 212 and the connecting steel reinforcement cage 41. At the same time, the screw rod is screwed to disengage from the sleeve, and then the turning plate 212 is rotated to open the casting port 213, and the casting port 213 is convenient for pouring concrete onto the connecting steel reinforcement cage 41.

[0064] Refer to Figure 1 and Figure 2 , the concrete layer 42 is formed by pouring concrete onto the connecting steel reinforcement cage 41. The concrete layer 42 fixes the supporting bottom plate 21, thereby realizing the detachable connection between the supporting bottom plate 21 and the bottom wall of the pilot tunnel.

[0065] Refer to Figure 1 and Figure 2, the supporting device 2 further includes three side plates 22 and a driving mechanism 3. The three side plates 22 are divided into a middle plate 23, a left plate 24 and a right plate 25 which are respectively located on both sides of the middle plate 23 close to the side wall of the guide pit. The bottom ends of the left plate 24 and the right plate 25 are horizontally slidably mounted on the upper surface of the supporting bottom plate 21, and the sliding directions of the left plate 24 and the right plate 25 are along approaching or departing from the side wall of the guide pit. At the same time, the left plate 24 and the right plate 25 are located on both sides of the pouring port 213 and are arc-shaped. Therefore, after the supporting device 2 in the left guide pit 12 and the right guide pit 13 is installed, the two left plates 24 are located between the two right plates 25, and the distance between the top ends of the two left plates 24 is greater than the distance between the bottom ends; and both ends of the middle plate 23 abut against the side walls on the opposite sides of the left plate 24 and the right plate 25, and the middle plate 23 is vertically slidably mounted on the upper surface of the supporting bottom plate 21. When the three side plates 22 are used to support the side wall of the guide pit after extrusion, the middle plate 23 moves to the outside of the left plate 24 and the right plate 25.

[0066] Refer to Figure 2 and Figure 4 , the driving mechanism 3 is arranged on the supporting bottom plate 21, and the driving mechanism 3 is used to drive the three side plates 22 to move simultaneously. The driving mechanism 3 includes a push plate 31, a push rod 32 and a driving component 33. The push plate 31 is vertically slidably mounted on the upper surface of the supporting bottom plate 21, and the push plate 31 is located below the middle plate 23 and between the left plate 24 and the right plate 25. Inclined upward sliding ways 311 are fixedly installed at both ends of the push plate 31, and the two sliding ways 311 are in a shape of an inverted V. At the same time, the distance between the top ends of the two sliding ways 311 is less than the distance between the bottom ends; the push rod 32 is fixedly installed on the upper surface of the push plate 31, and the push rod 32 is in a vertical state and is fixedly connected to the lower surface of the middle plate 23.

[0067] Refer to Figure 2 and Figure 4 , the right plate 25 is located on the side of the middle plate 23 close to the arc-shaped side wall 14. Horizontally arranged first sliding rods 241 and second sliding rods 251 are fixedly installed on the opposite side walls of the left plate 24 and the right plate 25. A sliding seat 26 is horizontally slidably mounted on the second sliding rod 251. The sliding seat 26 and the first sliding rod 241 respectively extend to the two sliding ways 311. A first mounting shaft 27 extending into the sliding way 311 is detachably installed on the first sliding rod 241 through a screw, and a second mounting shaft 28 extending into the other sliding way 311 is also detachably installed on the sliding seat 26 through a screw. Rollers 29 rolling on the sliding ways 311 are rotatably installed on both the first mounting shaft 27 and the second mounting shaft 28.

[0068] Refer to Figure 2 and Figure 4A moving assembly 6 for driving the sliding seat 26 to move is provided on the second sliding rod 251. The moving assembly 6 includes two fixed blocks 61 and a moving screw 62. The two fixed blocks 61 are fixedly installed on the second sliding rod 251, and the two fixed blocks 61 are horizontally spaced and arranged in a direction close to or away from the side wall of the guide pit, and the sliding seat 26 extends between the two fixed blocks 61. The moving screw 62 is rotatably installed on the two fixed blocks 61, and the moving screw 62 is threadedly connected to the sliding seat 26. At the same time, the sliding seat 26 can be pressed against the opposite side walls of the two fixed blocks 61 for positioning.

[0069] Reference Figure 2 and Figure 4 A plurality of plug-in grooves are provided on the side wall of the right plate 25 facing away from the push plate 31, and a fixed steel cage 15 is plugged and installed on the plug-in groove, and the fixed steel cage 15 is tied into a cage shape by multiple steel bars. At the same time, part of the steel bars of the fixed steel cage 15 are exposed and plugged and installed on the plug-in groove for positioning, and a positioning plate 16 is fixedly installed on the side wall of the fixed steel cage 15 facing away from the right plate 25, and the positioning plate 16 squeezes and supports the arc-shaped side wall 14, and a plurality of positioning holes are evenly provided on the positioning plate 16.

[0070] Reference Figure 1 and Figure 2 A fixing rod 17 passing through the positioning hole is fixedly installed on the arc-shaped side wall 14 , so the fixing rod 17 is used to position the positioning plate 16 , and the fixing rod 17 can use an expansion screw or a fixed anchor cable to fix the positioning plate 16 .

[0071] Reference Figure 2 and Figure 4 The driving assembly 33 is arranged on the supporting bottom plate 21 and is used to drive the push plate 31 to move up and down. The driving assembly 33 is started to drive the push plate 31 to move up. The upward movement of the push plate 31 drives the left plate 24 and the right plate 25 to move away from each other. The movement of the right plate 25 drives the fixed steel cage 15 and the positioning plate 16 to move, so that the left plate 24 squeezes and supports the side wall of the guide pit, and the positioning plate 16 squeezes and supports the arc-shaped side wall 14. At the same time, the middle plate 23 moves up to squeeze and support the side wall of the guide pit. Therefore, the right plate 25, the middle plate 23 and the positioning plate 16 cooperate to squeeze and support the side wall of the guide pit.

[0072] Reference Figure 1 and Figure 2 , the fixing rod 17 is passed through the positioning hole and fixedly installed on the arc-shaped side wall 14 , so that the fixing rod 17 positions the positioning plate 16 and the fixed steel cage 15 .

[0073] Reference Figure 2 and Figure 4, turn the moving screw 62 to rotate and drive the right plate 25 away from the fixed steel cage 15, and the sliding seat 26 is pressed against the fixed block 61 for positioning, and then concrete is sprayed onto the fixed steel cage 15 to form a fixed layer, and part of the steel bars on the fixed steel cage 15 are exposed, and then the moving screw 62 is rotated to drive the right plate 25 close to the fixed steel cage 15, so that the fixed steel cage 15 is exposed and plugged into the plug-in groove, and the sliding seat 26 is pressed against another fixed block 61 for positioning, so that the right plate 25 squeezes and compacts the concrete, thereby realizing the rear support of the side wall of the guide pit after squeezing.

[0074] Reference Figure 4 The driving assembly 33 includes a fixed tube 34, a driving rod 35 and a driving ring 36. The fixed tube 34 is fixedly mounted on the upper surface of the supporting bottom plate 21, and the fixed tube 34 is in a vertical state and is located between the multiple pouring ports 213; the driving rod 35 is fixedly mounted on the lower surface of the push plate 31, and the driving rod 35 is coaxially slidably penetrated on the fixed tube 34; and the driving ring 36 is coaxially rotatably mounted on the top of the fixed tube 34, and the driving ring 36 is threadedly connected to the driving rod 35, and a lever is fixedly mounted on the driving ring 36 for facilitating the rotation. The lever is moved to drive the driving ring 36 to rotate, and the driving ring 36 rotates to drive the driving rod 35 to move up and down, and the driving rod 35 moves to drive the push plate 31 to move, so that the lever rotates to drive the push plate 31 to move.

[0075] Reference Figure 1 and Figure 2 The supporting device 2 for supporting the middle guide pit 11 does not have the left plate 24, the right plate 25 and the connecting steel cage 41. At the same time, the structures arranged on the middle plate 23 and the right plate 25 on the middle guide pit 11 are the same. When the supporting bottom plate 21 is placed on the step hole for support, the two ends of the supporting bottom plate 21 are pressed against the side walls on the opposite side of the two left plates 24. Therefore, by disassembling the unnecessary structures in the supporting device 2, and then replacing the middle plate 23 with the middle plate 23 with the same structure as the right plate 25, and the middle plate 23 is also provided with a fixed steel cage 15 and a positioning plate 16, it is possible to support the middle guide pit 11.

[0076] Reference Figure 1 and Figure 4, place the support base plate 21 on the stepped hole, and the support base plate 21 presses against the side walls on the opposite sides of the two left plates 24. Then, start the driving assembly 33 to drive the middle plate 23 to drive the positioning plate 16 to squeeze and support the side wall of the pilot tunnel. Then, position the positioning plate 16 and the fixed steel reinforcement cage 15 through the fixing rod 17. Next, the driving assembly 33 drives the middle plate 23 away from the fixed steel reinforcement cage 15, and then sprays and pours concrete onto the fixed steel reinforcement cage 15. The driving assembly 33 drives the middle plate 23 to move back to compact the concrete. The poured concrete is connected to the two fixed layers, so as to support the arched side wall of the tunnel.

[0077] The working principle of the embodiment of the present application is as follows:

[0078] Excavate the right pilot tunnel 13, then place the connecting steel reinforcement cage 41 on the bottom wall of the pilot tunnel and insert part of the steel bars into the bottom wall of the pilot tunnel for positioning. Then, rotate the turning plate 212 to open the pouring port 213, and the concrete is poured onto the connecting steel reinforcement cage 41 through the pouring port 213. At the same time, rotate the driving ring 36 to drive the left plate 24, the middle plate 23, and the positioning plate 16 to approach the side wall of the pilot tunnel, so that the left plate 24, the middle plate 23, and the positioning plate 16 support the side wall of the pilot tunnel after extrusion. After the concrete pouring is completed, rotate the turning plate 212 to approach the connecting steel reinforcement cage 41 to close the pouring port 213.

[0079] Then, pass the fixing rod 17 through the positioning plate 16 and fixedly install it on the arc-shaped side wall 14. Next, turn the moving screw 62 to drive the right plate 25 away from the arc-shaped side wall 14, then spray concrete onto the fixed steel reinforcement cage 15, and then turn the moving screw 62 to drive the right plate 25 to move back to squeeze and compact the concrete to form the fixed layer 7, so as to complete the excavation, support and protection of the right pilot tunnel 13.

[0080] Then, the left pilot tunnel 12 is excavated and supported and protected in the same way. Next, the upper section of the middle pilot tunnel 11 is excavated to form a stepped hole. Then, the left plate 24, the right plate 25, and the connecting steel reinforcement cage 41 are removed from the support base plate 21. Then, the middle plate 23 is replaced with a middle plate 23 having the same structure as the right plate 25. Then, the support base plate 21 is placed on the stepped hole, and at the same time, the support base plate 21 presses against the side walls on the opposite sides of the two left plates 24. Then, the driving ring 36 is rotated to drive the middle plate 23 and the connecting steel reinforcement cage 41 to move, and the middle plate 23 drives the positioning plate 16 to extrude the arc-shaped side wall 14. Then, the positioning plate 16 is fixed by the fixing rod 17. Next, the push rod 32 drives the middle plate 23 away from the middle plate 23, and then concrete is sprayed onto the connecting steel reinforcement cage 41. Then, the middle plate 23 moves back to extrude and compact the concrete. Therefore, the sprayed concrete is connected to the two fixing layers 7 in the left pilot tunnel 12 and the right pilot tunnel 13 to support the arched surface of the station tunnel. Finally, the lower section of the middle pilot tunnel 11 is excavated, and the support base plate 21 supports the two left plates 24. Then, after the support device 2 is removed, the concrete is repeatedly sprayed to connect the two concrete layers 42 together and bury the exposed steel bars. Then, the excavation and support of the next section are continued to complete the construction of the entire station tunnel, thus improving the safety and construction efficiency of the station tunnel excavation.

[0081] The embodiment of the present application discloses a construction process of a construction equipment for double-side drift bench construction of a large cross-section station of an urban rapid rail.

[0082] A construction process of a construction equipment for double-side drift bench construction of a large cross-section station of an urban rapid rail, characterized by comprising the following process steps:

[0083] S1. Install the grouting pipe and grout. Drill a plurality of grouting holes at intervals along the contour of the arched side wall of the tunnel, install the grouting pipe into the grouting holes, and perform grouting.

[0084] S2. Excavate the right pilot tunnel 13 and install the support device 2. Excavate the right pilot tunnel 13, and then install the support device 2 on the right pilot tunnel 13 for support and protection.

[0085] S3. Excavate the left pilot tunnel 12 and install the support device 2. Excavate the left pilot tunnel 12, and then install the support device 2 on the left pilot tunnel 12 for support and protection.

[0086] S4. Excavate the middle pilot tunnel 11 and install the support device 2. First, excavate the upper section of the middle pilot tunnel 11 to form a stepped hole. Then, remove the left plate 24, the right plate 25, and the connection reinforcement cage 41. Next, replace the middle plate 23 with a middle plate 23 having a socket groove. Then, place the support bottom plate 21 on the stepped hole and press it against the side walls on the opposite sides of the two left plates 24. Next, start the support device 2 and install it on the side wall of the pilot tunnel. Finally, continue to excavate the lower section of the middle pilot tunnel 11 to achieve the excavation of the entire tunnel.

[0087] S5. Remove the support device 2, and then continue to spray concrete to complete the construction of the tunnel.

[0088] The working principle of the embodiment of the present application is as follows:

[0089] First, a plurality of grouting holes are spacedly opened along the contour of the arched side wall of the tunnel. Then, grouting pipes are added into the grouting holes, and grouting is carried out through the grouting pipes so that the concrete intrudes into the section. Then, the right pilot tunnel 13 is excavated. After excavation, the support device 2 is installed in the right pilot tunnel 13 for support. Then, the left pilot tunnel 12 is excavated. After excavation, the support device 2 is installed in the left pilot tunnel 12 for support. Next, the upper section in the middle pilot tunnel 11 is excavated to form a stepped hole. Then, the support device 2 is installed on the stepped hole for support. Then, the lower section of the middle pilot tunnel 11 is excavated to achieve the excavation of the tunnel. Finally, the support device 2 is removed, and then continue to spray concrete to complete the construction of the tunnel.

[0090] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. The double-side drift bench construction equipment for large cross-section stations of urban rapid rail, characterized in that: Comprising a support device (2) for supporting a pilot tunnel, the support device (2) comprising: A support base plate (21) which is placed on the bottom wall of the pilot tunnel; Three side plates (22), the three side plates (22) being slidably arranged on the support base plate (21) along different sliding directions and cooperating to support the side wall of the pilot tunnel after extrusion; A driving mechanism (3), the driving mechanism (3) being arranged on the support base plate (21) and used for driving the three side plates (22) to move simultaneously; One of the side plates (22) is a middle plate and both ends thereof abut against the side walls on the opposite sides of the other two side plates (22), and the driving mechanism (3) comprises: A push plate (31), the push plate (31) being slidably arranged on the support base plate (21) and slidably connected to the two side plates (22) located on both sides of the middle plate and used for pushing the two side plates (22) away from or close to each other; A push rod (32), the push rod (32) being arranged on the push plate (31) and connected to the middle plate and used for driving the middle plate to approach or move away from the top wall of the pilot tunnel; A driving component (33), the driving component (33) being arranged on the support base plate (21) and used for driving the push plate (31) to move; The side wall of the pilot tunnel forming the arched side wall of the station tunnel is an arc-shaped side wall (14), and a fixed steel reinforcement cage (15) for pouring concrete is inserted on the side plate (22) close to the arc-shaped side wall (14). A positioning plate (16) supported on the arc-shaped side wall (14) is fixedly installed at one end of the fixed steel reinforcement cage (15) away from the side plate (22), and a fixing rod (17) passing through the positioning plate (16) and used for fixing the positioning plate (16) is fixedly installed on the arc-shaped side wall (14); The middle plate is detachably connected to the push rod (32), while the side plates (22) at both side positions are detachably connected to the push plate (31) and can be removed from the support base plate (21). A sliding seat (26) detachably connected to the push plate (31) is slidably arranged on the side plate (22) inserted with the fixed steel reinforcement cage (15), and a moving component (6) connected to the sliding seat (26) is arranged on the side plate (22).

2. The double-side drift bench construction equipment for large-section stations of urban rapid rail according to claim 1, wherein: The driving component (33) comprises: A fixed pipe (34), the fixed pipe (34) being arranged on the support base plate (21); A driving rod (35), the driving rod (35) being arranged on the push plate (31) and slidably arranged on the fixed pipe (34); A driving ring (36), the driving ring (36) being rotatably arranged on the fixed pipe (34) and threadedly connected to the driving rod (35).

3. The double-side drift bench construction equipment for large cross-section stations of urban rapid rail according to claim 1, characterized in that: The moving component (6) comprises: Two fixed blocks (61), the two fixed blocks (61) being arranged on the side plate (22) and the sliding seat (26) extending between the two fixed blocks (61); A moving screw rod (62), the moving screw rod (62) being rotatably arranged on the two fixed blocks (61) and threadedly connected to the sliding seat (26), so that the sliding seat (26) abuts against the opposite side walls of the two fixed blocks (61) for positioning.

4. The double-side drift bench construction equipment for large-section urban rapid rail stations according to claim 1, characterized in that: The two side plates (22) on the side away from the arc-shaped side wall (14) are both arc-shaped and the distance between the top ends is greater than the distance between the middle positions. When the support device (2) supports the middle guide pit (11), the support bottom plate (21) is supported on the side walls on the opposite side of the two side plates (22) for positioning.

5. The double-side drift bench construction equipment for large-section urban rapid rail stations according to claim 1, characterized in that: The supporting bottom plate (21) is detachably connected to the bottom wall of the guide pit via a fixing assembly (4), wherein the fixing assembly (4) comprises: A connecting steel cage (41), wherein the connecting steel cage (41) is detachably arranged on the lower surface of the supporting bottom plate (21) through a connecting assembly (5) and a portion of the steel bars are inserted into the bottom wall of the guide pit for positioning and pressing against the bottom wall of the guide pit; A concrete layer (42) is formed by pouring concrete on the connecting steel cage (41).

6. The double-side drift bench construction equipment for large cross-section stations of urban rapid rail according to claim 5, characterized in that: The connection component (5) comprises: A connecting screw (51), wherein the connecting screw (51) passes through the supporting base plate (21); A connecting sleeve (52) is arranged on the connecting steel cage (41) and abuts against the supporting base plate (21); the connecting screw rod (51) is threadedly connected to the connecting sleeve (52).

7. The double-side drift bench construction equipment for large-section urban rapid rail stations according to claim 5, characterized in that: A flip plate (212) mounted on the connecting steel cage (41) is rotatably mounted on the supporting bottom plate (21). When the flip plate (212) is rotated away from the connecting steel cage (41), a pouring port (213) that facilitates concrete pouring can be formed. The flip plate (212) is detachably connected to the connecting steel cage (41).

8. The construction process applied to the construction equipment for double-sided drift bench method of large cross-section stations of urban rapid rail as described in any one of claims 1-7, characterized in that: The process steps include: S1, installing grouting pipes and grouting, drilling holes at intervals along the arch sidewall profile of the tunnel to obtain multiple grouting holes, installing grouting pipes on the grouting holes and performing grouting; S2, excavating the right side guide pit (13), installing the support device (2), excavating the right side guide pit (13), and then installing the support device (2) on the right side guide pit (13) for support positioning; S3, excavating the left side guide pit (12), installing the support device (2), excavating the left side guide pit (12), and then installing the support device (2) on the left side guide pit (12) for support positioning; S4, excavating the middle pilot pit (11) and installing the support device (2), first excavating the upper section of the middle pilot pit (11) to form a stepped hole, then removing the side plates (22) located on both sides, then placing the support bottom plate (21) on the stepped hole and pressing it against the side walls on the opposite side of the two side plates (22), then installing other structures in the support device (2) on the pilot pit, and finally continuing to excavate the lower section of the middle pilot pit (11), thereby completing the excavation of the entire tunnel; S5, dismantle the supporting device (2), and then continue to spray concrete to complete the construction of the tunnel.

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