Construction method for shield tunneling through ultra-deep foundation pit with temporary shoring

Abstract

The present invention discloses a construction method for a temporary plate support-assisted shield tunneling through an ultra-deep foundation pit, comprising the following steps: Step 1, temporary plate support removal and establishment of a safe working platform; Step 2, laying of a bottom tire buffer system; Step 3, installation of a hoisting system for cutting and placing plates; Step 4, cutting of temporary plate support; Step 5, hoisting of the cut plates of temporary plate support; Step 6, tunneling of the shield equipment through the ultra-deep foundation pit; Step 7, establishment of a track slab support: establishment of a scaffolding structure below the area where the track slab is to be cast; Step 8, casting of the track slab. The construction method involved in the present invention can solve the problem of a temporary plate support structure assisting a shield tunneling through the foundation pit under an ultra-deep foundation pit, and has good technical benefits; and the use of a safe working platform for temporary plate support removal solves the problem of limited high-altitude working space in ultra-deep foundation pits, providing a working platform for workers to perform high-altitude operations.

Description

Technical Field

[0001] The present invention relates to the technical field of subway construction, and particularly relates to a construction method for temporarily supporting a shield to pass through an ultra-deep foundation pit with the assistance of a temporary slab brace. Background Art

[0002] During the construction of a large-span subway station, WDJ bowl-coupled steel pipe scaffolds are usually erected under the middle slab and top slab to bear the vertical load from the upper part, so as to ensure that the stress and deformation of the slab are within the allowable range during the concrete pouring process. However, due to overall planning and supporting construction requirements, that is, before the top slab concrete is poured, some scaffolds under the middle slab need to be removed to provide space for laying the shield trailer track for the shield trailer to transport materials, discharge slag, etc. Therefore, in order to ensure the safe progress of the top slab concrete pouring, a temporary slab brace is used to support the shield space.

[0003] Under the working conditions of an ultra-deep foundation pit, the implementation of a temporary slab brace will face many problems. At the same time, due to the complexity of the shield structure, the demolition and restoration of the temporary slab brace are very challenging for the construction technology of on-site implementers.

[0004] In view of this, how to improve the demolition and restoration efficiency of the temporary slab brace under an ultra-deep foundation pit, and at the same time solve the problem of shield passing through under an ultra-deep foundation pit, there is an urgent need to invent a simple and effective construction method for demolishing and restoring the temporary slab brace. Summary of the Invention

[0005] The purpose of the present invention is to provide a construction method for temporarily supporting a shield to pass through an ultra-deep foundation pit, aiming to improve the construction quality and efficiency of the temporary slab brace supporting structure assisting the shield to pass through the foundation pit under an ultra-deep foundation pit, and having good technical and economic benefits.

[0006] To achieve the above technical purpose, the present invention adopts the following technical solutions:

[0007] A construction method for temporarily supporting a shield to pass through an ultra-deep foundation pit includes the following steps:

[0008] Step 1: Erecting a safety operation platform for demolishing the temporary slab brace: Connect the operation platform to the top of the structure through the vertical rods of the support hanger, and the operation platform is located above the temporary slab brace;

[0009] Step 2: Laying a bottom tire buffer system: Fabricate a tire fixing frame, lay the tire fixing frame in an array at the bottom of the structure, and lay rubber tires in the tire fixing frame, so as to form a buffer zone under the temporarily supported slab to be cut;

[0010] Step 3: Installing a hoisting system for cutting and dropping the slab; Fix the fixed pulley frame with a fixed pulley to the top of the structure, install a winch on the side of the structure, the steel wire rope on the winch bypasses the fixed pulley, and the end of the steel wire rope is connected to a hook;

[0011] Step 4. Cutting of temporary shoring: Workers stand on the operation platform to cut the temporary shoring. After cutting the temporary shoring, several cut-off plates are formed.

[0012] Step 5. Lifting and placing of cut-off plates of temporary shoring: After cutting the temporary shoring, connect the cut-off plates to the hooks. By rotating the winding handle on the winch, the wire rope is wound or unwound, driving the rise or fall of the hooks, and gently lowering the cut-off plates to the bottom tire buffer system.

[0013] Step 6. Shield equipment passing through the ultra-deep foundation pit.

[0014] Step 7. Erection of lane slab supports: Erect a scaffolding structure below the area where the carriageway slab is to be poured.

[0015] Step 8. Pouring of carriageway slab: Install the carriageway slab formwork at the top of the scaffolding structure, set up a temporary operation platform above the carriageway slab formwork, and set a top slot on the top of the structure; Connect one end of the pumping pipe to the ground pump, and the other end hangs above the carriageway slab formwork; Start the ground pump to pump concrete into the carriageway slab formwork, and workers stand on the temporary operation platform to perform concrete pouring and vibrating operations and other auxiliary construction operations.

[0016] Preferably, in Step 1, drill holes in the top of the structure to implant embedded bolts, and fixedly connect the bolt holes b on the suspension sleeve to the embedded bolts; There is a square slot on the operation platform. Pass the vertical rod of the suspension support through the square slot on the operation platform, and pass the bolt through the bolt hole on the lower part of the vertical rod of the suspension support; Insert the upper end of the vertical rod of the suspension support into the suspension sleeve, and pass the bolt through the bolt hole a on the suspension sleeve and the bolt hole on the upper part of the vertical rod of the suspension support at the same time.

[0017] Preferably, in Step 3, when fixing the fixed pulley fixing frame, first embed the fixed pulley embedded base into the top of the structure, and then weld the fixed pulley fixing frame to the fixed pulley embedded base.

[0018] Preferably, in Step 3, when installing the winch, first embed the winch embedded base on the side of the structure, and weld and fix the winch to the winch embedded base.

[0019] Preferably, in Step 4, when cutting the temporary shoring, first cut the first incision at the position near the structure on the left side of the temporary shoring. The incision forms an angle of ° with the horizontal line from top to bottom; Then cut the second incision at the position near the structure on the right side of the temporary shoring. The incision forms an angle of ° with the horizontal line from top to bottom; Finally, cut the third incision at the middle position of the temporary shoring. The incision is perpendicular to the horizontal line.

[0020] Preferably, in step seven, when erecting the scaffolding structure, install the scaffolding diagonal brace fastener on the fastener fixing plate on the scaffolding vertical pole. Temporarily lock the scaffolding cross bar, scaffolding vertical pole, and scaffolding diagonal brace through the scaffolding diagonal brace fastener and the pin to form the scaffolding structure. Install the scaffolding top support on the scaffolding vertical pole at the top of the scaffolding structure, place the square steel support in the scaffolding top support, hinge the lower scaffolding vertical pole of the scaffolding system with the hinge base, and fix the hinge base on the foundation at the bottom of the structure body. Fix and connect the scaffolding vertical poles with each other through the scaffolding connecting cylinder and the scaffolding fixing bolt.

[0021] Preferably, when the foundation is an inclined slope surface, adjust the angle of the lower hinge base of the scaffolding system to adapt to the slope so that the scaffolding vertical pole remains vertical.

[0022] Preferably, in step eight, install the pumping pipe fixing bracket on the side of the groove opened at the top of the structure body, and pass the pumping pipe through the pumping pipe fixing bracket.

[0023] Preferably, in step eight, when setting up the temporary operation platform, first embed the I-beam embedded base into the structural walls on both sides of the structure body, weld and fix the I-beam with the I-beam embedded base, and place the operation platform wooden board on the I-beam to form the temporary operation platform.

[0024] The present invention has the following characteristics and beneficial effects:

[0025] 1. The structure involved in the present invention can solve the problem of the auxiliary shield tunneling construction under the super-deep foundation pit with the temporary slab bracing structure, and has good technical benefits.

[0026] 2. Adopt the temporary slab bracing demolition safety operation platform to solve the problem of limited working space for high-altitude operations in the super-deep foundation pit, and provide a working platform for workers' high-altitude operations.

[0027] 3. Adopt the optimized division method of the demolition plate to improve the construction efficiency of the temporary slab bracing demolition.

[0028] 4. Adopt the lifting system for the cut plates to solve the problem of difficult lifting after the temporary slab bracing is cut, and at the same time solve the construction safety hazard problem caused by the messy falling of the cut plates of the slab bracing.

[0029] 5. Adopt the bottom rubber tire buffer system to solve the problem that the lifting of the cut plates of the temporary slab bracing to the lower space is likely to cause impact on the structure body, and at the same time solve the problem that the impact of the cut plates brings up fragmented stones and causes secondary ejection, which poses a safety hazard to the construction.

[0030] 6. Adopt the carriageway slab support system and the bottom adjustable scaffolding to solve the problem of difficult erection of the scaffolding on the slope surface. The scaffolding is used as a formwork erection support, and at the same time solve the problem of difficult formwork support under the super-deep foundation pit.

[0031] 7. The carriageway slab ground pump pouring system is adopted to provide a construction platform for workers, solving the problem that the lack of working space for workers affects the construction quality during the concrete pouring in the ultra-deep foundation pit, and at the same time solving the problem of difficult concrete pouring in the ultra-deep foundation pit. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the temporary slab strut assisting the shield to pass through the ultra-deep foundation pit in the present invention;

[0033] Figure 2 It is a schematic diagram of the layout of the safe operation platform for the demolition of the temporary slab strut;

[0034] Figure 3 It is a schematic diagram of the structure of the operation platform;

[0035] Figure 4 It is Figure 3 The enlarged view of area A in

[0036] Figure 5 It is Figure 4 The schematic diagram of the structure installation;

[0037] Figure 6 It is Figure 3 The enlarged view of area B in

[0038] Figure 7 It is Figure 6 The schematic diagram of the structure installation;

[0039] Figure 8 It is the schematic diagram of the optimized division of the demolition plates;

[0040] Figure 9 It is the schematic diagram of the structure of the hoisting system for the cut plates;

[0041] Figure 10 It is Figure 9 The enlarged view of area C in

[0042] Figure 11 It is Figure 9 The enlarged view of area D in

[0043] Figure 12 It is Figure 9 The enlarged view of area E in

[0044] Figure 13 It is the schematic diagram of the structure of the bottom rubber tire buffer system;

[0045] Figure 14 It is Figure 13 The enlarged view of area F in

[0046] Figure 15 It is the schematic diagram of the layout of the bottom rubber tire buffer system;

[0047] Figure 16 It is a schematic diagram of the structure of the carriageway slab support system;

[0048] Figure 17 It is a schematic diagram of the scaffolding structure of the carriageway slab support system;

[0049] Figure 18 It is Figure 17 The enlarged view of area G in

[0050] Figure 19 It is Figure 17 The enlarged view of area H in

[0051] Figure 20 It is Figure 17 The enlarged view of area I in

[0052] Figure 21 It is Figure 17 The enlarged view of area J in

[0053] Figure 22 It is a schematic diagram of the layout of the ground pump pouring system for the carriageway slab;

[0054] Figure 23 It is Figure 22 The enlarged view of area K in

[0055] Among them: 1. Suspension vertical rod, 2. Operation platform, 3. Bolt hole of suspension vertical rod, 4. Suspension sleeve, 5. Bolt hole a of suspension sleeve, 6. Bolt, 7. Bolt hole b of suspension sleeve, 8. Embedded bolt, 9. Square slot, 10. Temporary plate brace, 11. First knife cut, 12. Second knife cut, 13. Third knife cut, 14. Fixed pulley embedded base, 15. Fixed pulley fixing frame, 16. Fixed pulley, 17. Steel wire rope, 18. Reel embedded base, 19. Reel, 20. Reel handle, 21. Hook, 22. Cross bar of tire fixing frame, 23. Vertical rod of tire fixing frame, 24. Rubber tire, 25. Stud, 26. Scaffolding cross bar, 27. Scaffolding vertical rod, 28. Scaffolding diagonal brace, 29. Square steel support, 30. Scaffolding top bracket, 31. Scaffolding diagonal brace fastener, 32. Pin, 33. Fastener fixing plate, 34. Hinge base, 35. Scaffolding connecting cylinder, 36. Scaffolding fixing bolt, 37. Ground pump, 38. Pumping pipe fixing frame, 39. Pumping pipe, 40. Operation platform wood board, 41. I-beam, 42. Carriageway slab formwork, 43. Structural wall, 44. I-beam embedded base. Specific implementation manners

[0056] To achieve the above technical objectives, the present invention adopts the following technical solutions:

[0057] Such as Figure 1As shown in the figure, the present invention provides a construction structure for a temporary plate brace to assist a shield tunneling through an ultra-deep foundation pit, including a safety operation platform for removing the temporary plate brace, a hoisting system for cutting and removing plates, a rubber tire buffer system at the bottom, a support system for the carriageway slab, and a concrete pump pouring system for the carriageway slab.

[0058] As Figures 2 - 7 shown, the safety operation platform for removing the temporary plate brace includes a lifting vertical rod 1, an operation platform 2, and a lifting sleeve 4. Both the upper and lower parts of the lifting vertical rod 1 are provided with lifting vertical rod bolt holes 3. The lifting sleeve 4 is provided with a lifting sleeve bolt hole b5 and a lifting sleeve bolt hole b7 at the top. The lifting sleeve 4 is fixed to the upper part of the structure by a pre-embedded bolt 8, and the pre-embedded bolt 8 is pre-embedded in the top of the structure; the pre-embedded bolt 8 is connected to the lifting sleeve bolt hole b7 at the top of the lifting sleeve 4. The lifting sleeve 4 and the lifting vertical rod 1 are fixed by bolts 6; when fixing, the upper end of the lifting vertical rod 1 is inserted into the lifting sleeve 4, and the lifting vertical rod bolt hole 3 on the lifting vertical rod 1 is aligned with the lifting sleeve bolt hole b5 on the lifting sleeve 4, and then the bolt 6 is connected to the lifting vertical rod bolt hole 3 and the lifting sleeve bolt hole b5 at the same time. The operation platform 2 is provided with a square slot 9, and the square slot 9 is arranged at the two side edges of the operation platform 2. The operation platform 2 and the lifting vertical rod 1 are fixed by bolts 6; when fixing the operation platform 2 and the lifting vertical rod 1, the lower end of the lifting vertical rod 1 passes through the square slot 9 on the operation platform 2, and then the bolt 6 is connected to the lifting vertical rod bolt hole 3 at the lower end of the lifting vertical rod 1. Both ends of the bolt 6 extend out of the lifting vertical rod bolt hole 3, and both ends of the bolt 6 abut against the lower surface of the operation platform 2.

[0059] As Figure 8 shown, an optimized division method for the cutting and removing plates is that a first cutting notch 11 is set at a position 5 cm close to the structure on the left side of the temporary plate brace 10. The notch forms a 45° angle with the horizontal line from top to bottom. A second cutting notch 12 is set at a position 5 cm close to the structure on the right side of the temporary plate brace 10. The notch forms a 45° angle with the horizontal line from top to bottom. A third cutting notch 13 is set in the middle of the temporary plate brace 10, and the notch is perpendicular to the horizontal line.

[0060] As Figures 9 - 12 shown, the hoisting system for cutting and removing plates includes a fixed pulley pre-embedded base 14, a pulley fixing frame 15, a wire reel 19, and a wire reel pre-embedded base 18. The fixed pulley pre-embedded base 14 is pre-embedded in the upper part of the structure, and the pulley fixing frame 15 is welded to the fixed pulley pre-embedded base 14, so that the fixed pulley 16 on the pulley fixing frame 15 is fixed to the upper part of the structure; the wire reel pre-embedded base 18 is fixed on the side wall of the structure, the wire reel 19 is installed on the wire reel pre-embedded base 18, and a wire reel handle 20 is provided on the wire reel 19. The wire rope 17 is wound and released by rotating the wire reel handle 20. One end of the wire rope 17 is connected to the wire reel 19, and the other end bypasses the fixed pulley 16 and is connected to a hook 21.

[0061] As Figures 13 - 15 shown, the bottom wheel rubber tire buffer system includes a tire fixing frame and a rubber tire 24. The tire fixing frame includes a tire fixing frame cross bar 22 and a tire fixing frame vertical bar 23. The tire fixing frame cross bar 22 and the tire fixing frame vertical bar 23 are nailed together by a stud 25 to form the tire fixing frame. The tire fixing frame is in the shape of a rectangular frame structure. The tire fixing frame cross bar 22 is perpendicularly connected to the tire fixing frame vertical bar 23. There are several tire placement spaces inside the tire fixing frame, and the rubber tires 24 are placed in the tire placement spaces inside the tire fixing frame in a spatial array; the rubber tires 24 are placed in the tire placement spaces inside the tire fixing frame. The bottom wheel rubber tire buffer system is used to be placed at the bottom of the structure body.

[0062] As Figures 16 - 21 shown, the carriageway slab support system includes a scaffold vertical bar 27, a scaffold cross bar 26, and a scaffold diagonal brace 28. A fastener fixing plate 33 is provided on the scaffold vertical bar 27, and the scaffold diagonal brace fastener 31 is fastened and fixed on the fastener fixing plate 33; the scaffold cross bar 26, the scaffold vertical bar 27, and the scaffold diagonal brace 28 are temporarily locked by the scaffold diagonal brace fastener 31 and a pin 32 to form a scaffold structure. Among them, the scaffold cross bar 26 is horizontally connected between the scaffold vertical bars 27, and the scaffold diagonal brace 28 is obliquely connected between the scaffold vertical bars 27. At the upper end of the scaffold vertical bar 27 at the top of the scaffold structure, a scaffold top bracket 30 is provided, and a square steel support 29 is provided inside the scaffold top bracket 30. At the lower end of the scaffold vertical bar 27 at the lower part of the scaffold structure, it is hinged to a hinge base 34, and the hinge base 34 is installed on the foundation at the bottom of the structure body; the scaffold vertical bars 27 are fixedly connected by a scaffold connecting cylinder 35 and a scaffold fixing bolt 36.

[0063] As Figures 22 - 23 shown, the carriageway slab ground pump pouring system includes a pumping pipe fixing frame 38, a pumping pipe 39, a ground pump 37, a carriageway slab formwork 42, an I-beam embedded base 44, and an I-beam 41. The carriageway slab formwork 42 is horizontally installed at the upper end of the scaffold structure. The pumping pipe fixing frame 38 is fixed on the side of the groove opened at the top of the structure body. The pumping pipe 39 is connected to the ground pump 37, and the pumping pipe 39 passes through the pumping pipe fixing frame 38 and reaches above the carriageway slab formwork 42. The I-beam embedded base 44 is embedded in the structural walls 43 on both sides of the structure body. One end of the I-beam 41 is welded to the I-beam embedded base 44, and an operation platform wooden board 40 is provided on the I-beam 41. The I-beams 41 are located on both sides above the carriageway slab formwork 42.

[0064] The present invention also provides a construction method for temporarily supporting a shield to cross a super-deep foundation pit, including the following steps:

[0065] Step 1. Erection of the safety operation platform for temporary shoring removal: Drill holes at the top of the structure to implant embedded bolts 8, fix the hoisting sleeve 4 to the embedded bolt 8 through the hoisting sleeve bolt hole b7, pass the hoisting support vertical rod 1 through the square slot 9 on the operation platform 2, pass the bolt 6 through the hoisting vertical rod bolt hole 3 at the lower part of the hoisting vertical rod 1, insert the upper end of the hoisting vertical rod 1 into the hoisting sleeve 4, and pass the bolt 6 through the hoisting sleeve bolt hole a5 and the hoisting vertical rod bolt hole 3 to achieve the fixed connection between the hoisting vertical rod 1 and the hoisting sleeve 4; The erected operation platform 2 is located above the temporary shoring 10.

[0066] Step 2. Laying of the bottom tire buffer system: Rivet the tire fixing frame cross bar 22 and the tire fixing frame vertical bar 23 with a stud 25 to form a tire fixing frame, place the tire fixing frame at the bottom of the structure, and lay rubber tires 24 in the internal space of the tire fixing frame; Lay multiple tire fixing frames in an array at the bottom of the structure to form a buffer zone at the bottom of the structure, and the buffer zone is located below the temporary shoring 10 to be cut.

[0067] Step 3. Installation of the hoisting system for the cut plates: Embed the fixed pulley embedded base 14 at the top of the structure, weld the fixed pulley fixing frame 15 to the fixed pulley embedded base 14, fix the fixed pulley 16 in the fixed pulley fixing frame 15, embed the winch embedded base 18 on the side of the structure, weld and fix the winch 19 to the winch embedded base 18, wind one end of the steel wire rope 17 around the winch 19, and wind the other end of the steel wire rope 17 around the fixed pulley 16 and connect it to the hook 21.

[0068] Step 4. Cutting of the temporary shoring: Workers stand on the safety operation platform for temporary shoring removal and use a cutting machine to cut the temporary shoring 10; When cutting the temporary shoring 10, first cut the first cut 11 at a position 5 cm away from the structure on the left side of the temporary shoring 10, and the cut is at an angle of 45° with the horizontal line from top to bottom; Then cut the second cut 12 at a position 5 cm away from the structure on the right side of the temporary shoring 10, and the cut is at an angle of 45° with the horizontal line from top to bottom; Finally, cut the third cut 13 at the middle position of the temporary shoring 10, and the cut is perpendicular to the horizontal line; After cutting the temporary shoring 10, several cut plates are formed.

[0069] Step 5. Hoisting and placing of the cut plates of the temporary shoring: After cutting the temporary shoring, connect the cut plates to the hook 21, and by rotating the winch handle 20 on the winch 19, the steel wire rope 17 is wound and released, driving the hook 21 to rise or fall, and gently lower the cut plates to the bottom tire buffer system.

[0070] Step 6. Shield equipment crossing the ultra-deep foundation pit.

[0071] Step Seven: Erection of the lane slab support: Erect a scaffolding structure under the area of the carriageway slab to be poured; when erecting the scaffolding structure, install the scaffolding diagonal brace fastener 31 on the fastener fixing plate 33 on the scaffolding vertical pole 27, and temporarily lock the scaffolding cross bar 26, the scaffolding vertical pole 27, and the scaffolding diagonal brace 28 through the scaffolding diagonal brace fastener 31 and the pin 32 to form a scaffolding structure. Install the scaffolding top support 30 on the scaffolding vertical pole 27 at the top of the scaffolding structure, place the square steel support 29 in the scaffolding top support 30, hinge the lower scaffolding vertical pole 27 of the scaffolding system with the hinge base 34, and fix the hinge base 34 on the foundation at the bottom of the structure. Fix and connect the scaffolding vertical poles 27 through the scaffolding connecting cylinder 35 and the scaffolding fixing bolt 36; when the foundation is an inclined slope, adjust the angle of the lower hinge base 34 of the scaffolding structure to adapt to the slope so that the scaffolding vertical pole 27 remains vertical.

[0072] Step Eight: Pouring of the carriageway slab: First, embed the I-beam embedded base 44 into the structural walls 43 on both sides of the structure, weld and fix the I-beam 41 to the I-beam embedded base 44, place the operation platform wooden board 40 on the I-beam 41 to form a temporary operation platform, install the carriageway slab formwork 42 on the square steel support 29 at the top of the scaffolding system, set a top slot on the top of the structure, fix the pump pipe fixing frame 38 on the side of the top slot of the structure, install the ground pump 37 near the top slot, connect one end of the pump pipe 39 to the ground pump 37, and let the other end pass through the pump pipe fixing frame 38 and hang down above the carriageway slab formwork 42. Start the ground pump 37 to pump concrete into the carriageway slab formwork 42, and the workers stand on the temporary operation platform to carry out concrete pouring and vibrating operations and other auxiliary construction operations.

Claims

1. A temporary plate support assisted shield tunneling construction method for crossing an ultra-deep foundation pit, characterized in that: The following steps are involved: Step 1: Remove the temporary plank support and set up a safe working platform: Connect the operating platform (2) to the top of the structure through the support and hanger vertical rods (1), and the operating platform (2) is located above the temporary plank support (10); Step 2: Laying the bottom tire buffer system: making a tire fixing frame, laying the tire fixing frame array on the bottom of the structure, laying rubber tires (24) in the tire fixing frame, thereby forming a buffer zone below the temporary plate support (10) to be cut; Step 3: Cut off the plate and install the hanging system; fix the fixed pulley fixing frame (15) with the fixed pulley (16) to the top of the structure, install the reel (19) on the side of the structure, and pass the wire rope (17) on the reel (19) around the fixed pulley. The end of the wire rope (17) is connected to the hook (21); Step 4: Cutting the temporary board support: A worker stands on the operating platform (2) and cuts the temporary board support (10). After the temporary board support (10) is cut, a plurality of cut-off panels are formed; Step 5: Hanging and lowering the cut plate of the temporary plank support: After the temporary plank support is cut, the cut plate is connected to the hook (21), and the wire rope (17) is retracted and released by rotating the winding handle (20) on the reel (19), driving the hook (21) to rise or fall, and the cut plate is gently lowered to the bottom tire buffer system; Step 6: The shield equipment passes through the ultra-deep foundation pit; Step 7: Erection of the lane slab support: Erection of the scaffolding structure below the area where the lane slab is to be cast; Step 8: Pouring the road slab: Install the road slab template (42) on the top of the scaffolding structure, set a temporary operating platform above the road slab template (42), and set a top slot on the top of the structure; connect one end of the pumping pipe (39) to the ground pump (37), and hang the other end above the road slab template (42); start the ground pump (37) to pump concrete into the road slab template (42) for pouring, and workers stand on the temporary operating platform to perform concrete pouring and vibration operations and other auxiliary construction operations.

2. The temporary plate support assisted shield tunneling construction method for crossing an ultra-deep foundation pit according to claim 1 is characterized in that: In step 1, a hole is drilled on the top of the structure to implant a pre-embedded bolt (8), and the support sleeve bolt hole b (7) on the support sleeve (4) is fixedly connected to the pre-embedded bolt (8); a square slot (9) is provided on the operating platform (2), the support bracket vertical rod (1) is passed through the square slot (9) on the operating platform (2), and the bolt (6) is passed through the support vertical rod bolt hole (3) at the lower part of the support vertical rod (1); the upper end of the support vertical rod (1) is inserted into the support sleeve (4), and the bolt (6) is passed through the support sleeve bolt hole a (5) on the support sleeve (4) and the support vertical rod bolt hole (3) at the upper part of the support vertical rod (1) at the same time.

3. The temporary plate support assisted shield tunneling construction method for crossing an ultra-deep foundation pit according to claim 1 is characterized in that: In step three, when fixing the fixed pulley fixing frame (15), the fixed pulley embedded base (14) is first embedded in the top of the structure, and then the fixed pulley fixing frame (15) is welded to the fixed pulley embedded base (14).

4. The temporary plate support assisted shield tunneling construction method for crossing an ultra-deep foundation pit according to claim 1 is characterized in that: In step three, when installing the wire reel (19), first embed the wire reel embedded base (18) on the side of the structure, and weld the wire reel (19) and the wire reel embedded base (18) to fix them.

5. The temporary plate support assisted shield tunneling construction method for crossing an ultra-deep foundation pit according to claim 1 is characterized in that: In step 4, when cutting the temporary board support, first cut a first cut (11) on the left side of the temporary board support (10) near the structure, and the cut is at an angle of (45)° from top to bottom to the horizontal line; then cut a second cut (12) on the right side of the temporary board support (10) near the structure, and the cut is at an angle of (45)° from top to bottom to the horizontal line; finally, cut a third cut (13) in the middle of the temporary board support (10), and the cut is perpendicular to the horizontal line.

6. The temporary plate support-assisted shield tunneling construction method for crossing an ultra-deep foundation pit according to claim 1 is characterized in that: In step 7, when setting up the scaffold structure, the scaffold diagonal brace fastener (31) is installed on the fastener fixing plate (33) on the scaffold vertical rod (27), the scaffold cross bar (26), the scaffold vertical rod (27), and the scaffold diagonal brace (28) are temporarily locked by the scaffold diagonal brace fastener (31) and the latch (32) to form the scaffold structure, the scaffold top support (30) is installed on the scaffold vertical rod (27) at the top of the scaffold structure, the square steel support (29) is placed in the scaffold top support (30), the scaffold vertical rod (27) at the bottom of the scaffold system is hinged to the hinged base (34), the hinged base (34) is fixed on the foundation at the bottom of the structure, and the scaffold vertical rods (27) are fixedly connected to the scaffold fixing bolts (36) by the scaffold connecting tube (35).

7. The temporary plate support-assisted shield tunneling construction method for crossing an ultra-deep foundation pit according to claim 6 is characterized in that: When the foundation is an inclined slope, the angle of the hinged base (34) at the bottom of the scaffolding system is adjusted to adapt to the slope so that the scaffolding vertical rod (27) maintains a vertical direction.

8. The temporary plate support-assisted shield tunneling construction method for crossing an ultra-deep foundation pit according to claim 1 is characterized in that: In step eight, a pumping pipe fixing frame (38) is installed on the side of the groove on the top of the structure, and the pumping pipe (39) passes through the pumping pipe fixing frame (38).

9. The temporary plate support-assisted shield tunneling construction method for crossing an ultra-deep foundation pit according to claim 1 is characterized in that: In step eight, when setting up a temporary operating platform, the I-beam embedded base (44) is first embedded in the structural walls (43) on both sides of the structure, the I-beam (41) and the I-beam embedded base (44) are welded and fixed, and the operating platform wooden board (40) is placed on the I-beam (41) to form a temporary operating platform.

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