A method for constructing a deep-buried central ditch pipe in a tunnel and a lifting device for connecting blind pipes

Abstract

The present invention belongs to the technical field of tunnel drainage construction, specifically a method for constructing a deep-buried central ditch pipe and a lifting device for connecting blind pipes. The method comprises the following steps: step 1, excavating an inverted arch; step 2, excavating a reserved groove; step 3, placing a middle connecting blind pipe: using a crane in conjunction with a lifting device to place the middle connecting blind pipe into the reserved groove, simultaneously connecting the transverse water pipes on both sides to the middle connecting blind pipe, and then backfilling the middle connecting blind pipe reserved groove; step 4, installing a steel arch frame; step 5, casting the inverted arch; step 6, constructing a deep-buried central ditch pipe at the bottom of the tunnel: after the deep-buried central ditch pipe is constructed, a hole is drilled from the inside out at the center of the pipe top to connect with the middle connecting blind pipe, and vertical connecting blind pipes are inserted in sections to finally form a drainage system. The present invention has the advantages of achieving simultaneous construction of the deep-buried central ditch and the tunnel lining structure without interfering with each other, and high construction efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel drainage construction; specifically, the present invention relates to a method for constructing a deep-buried central ditch pipe in a tunnel and a hanger for connecting blind pipes. Background Art

[0002] With the continuous expansion of my country's railway construction, the number of railway tunnels being built in cold and high-altitude areas is also increasing. In order to ensure smooth drainage in tunnels in cold areas and effectively prevent frost heave in tunnels, a central deep-buried ditch is mostly set at the bottom of the tunnel invert. Due to the limited construction space of the ditch and the interference with the initial support process of the invert, the ditch construction often faces the problem of unsatisfactory construction efficiency, which seriously restricts the overall construction progress of the tunnel. At the same time, the existing drainage blind pipes do not have a fixing mechanism during installation. In the subsequent construction process, the blind pipes need to be installed and fixed separately and then connected to other pipes, which is a cumbersome process. Summary of the Invention

[0003] In view of this, the present invention provides a method for constructing a tunnel deep-buried central ditch jacking pipe and a hanger for connecting blind pipes, thereby solving or at least alleviating the above-mentioned problems existing in the prior art.

[0004] To achieve the aforementioned objectives, a first aspect of the present invention provides a method for constructing a deep-buried central trench pipe jacking in a tunnel, comprising:

[0005] Step 1: Inverted arch excavation: The inverted arch excavation is divided into two parts, left and right. After the excavation is completed, the base of the base is cleaned of slag, debris, and accumulated water.

[0006] Step 2: Excavate a reserved groove: excavate a reserved groove for connecting the middle blind pipe in the middle of the inverted arch bottom. The direction of the reserved groove is consistent with the layout direction of the central ditch.

[0007] Step 3: Place the middle connecting blind pipe: Use a crane with a lifting device to place the middle connecting blind pipe into the reserved groove. At the same time, connect the transverse water pipes on both sides to the middle connecting blind pipe, and then backfill the reserved groove for the middle connecting blind pipe.

[0008] Step 4: Install the steel arch frame: When installing the steel arch frame, connect the inverted arch steel arch frame with the steel arch frames at the arch feet of the left and right walls, and use connecting steel plates for welding to form a closed ring.

[0009] Step 5: Inverted arch pouring: First, tie and weld the inverted arch lining reinforcement. After installing the inverted arch formwork, pour the inverted arch concrete to complete the tunnel inverted arch construction.

[0010] Step 6. Construction of the deep-buried central ditch jacking pipe at the bottom of the tunnel: Use conventional jacking construction methods to construct the deep-buried central ditch jacking pipe at the bottom of the tunnel. After the construction of the deep-buried central ditch jacking pipe is completed, drill a hole from the inside to the outside at the center of the pipe top to connect it with the middle connecting blind pipe. At the same time, insert vertical connecting blind pipes in sections to finally form a drainage system.

[0011] The cam is secured to the bottom of the cam and secured to the bottom of the cam, and the cam is secured to the bottom of the cam by a locking mechanism.

[0012] In the sling for connecting blind pipes as described above, optionally, a lifting groove is provided in the hanging seat, the outer stopper is slidably provided in the lifting groove, and the outer stopper is supported on the inner top wall of the lifting groove when it is separated from the top end of the outer clamping plate.

[0013] In the sling for connecting blind pipes as described above, optionally, a groove is provided at the bottom of the outer stop block, the locking hook is located in the groove, and the top end of the locking hook supports the inner top wall of the groove, and the outer stop block is provided with a through groove for inserting the end of the boom downward into the groove.

[0014] In the sling connecting the blind pipe as described above, optionally, the lower surface of the locking hook is an inclined surface, the locking hook is telescopically arranged at the end of the sling rod, and a transverse spring is arranged in the sling rod to keep the locking hook in an extended state, and the outer splint is provided with an extrusion block located directly below the inclined surface of the locking hook when it is in the blind pipe released state, and the extrusion block is flush with the side wall of the through groove facing the locking hook in the extension direction of the locking hook, and when the sling and the outer stop block are reset downward, the extrusion block squeezes the locking hook into the sling by being inserted into the groove, and the inner top wall of the groove is supported by the top of the extrusion block, and a sleeve rod is provided on the top of the inner stop block, a sleeve groove is provided on the sling rod, and the top end of the sleeve rod is inserted into the sleeve groove, and when the outer stop block is detached from the outer splint, the top end of the sleeve rod is supported on the inner bottom wall of the sleeve groove.

[0015] In the aforementioned hanger for connecting blind pipes, optionally, a longitudinal spring is provided in the hanger, one end of which is connected to the outer stopper to provide elastic force for maintaining the outer stopper at the lowest position.

[0016] In the sling for connecting blind pipes as described above, optionally, the upper surface of the inner stop block is provided with guide rods located on both sides of the sleeve rod, the sleeve rod is hollow, and a notch is provided on the side of the sleeve rod facing the guide rod, and a through hole is provided at the top of the sleeve rod, and an upper steel wire rope is passed through the through hole, the top of which is fixed to the top wall of the sleeve groove, and the bottom end of the upper steel wire rope is connected to two lower steel wire ropes respectively passing through the notches, and the bottom end of the lower steel wire rope is connected to the outer side surface of the inner splint after passing through the bottom of the guide rod, and when the outer stop block is upwardly separated from the outer splint, the lower steel wire rope is in a fluffy state.

[0017] In the aforementioned sling for connecting blind pipes, optionally, the side surfaces of the inner stopper and the inner clamping plate opposite to each other are inclined surfaces with the top end tilted outwards, and accommodating grooves for accommodating the wire rope are provided on both sides of the sling.

[0018] In the sling for connecting blind tubes as described above, optionally, the outer clamping plate is provided with a slider with an "L"-shaped cross-section on the axially outer side of the blind tube and the inner clamping plate is provided on the axially inner side of the blind tube, and the sling is provided with a sliding groove that slides with the slider.

[0019] In the hanger for connecting blind pipes as described above, optionally, a tripod is provided on the outer surface of the outer clamping plate, the support wheel is rotatably installed at the top of the tripod, a limit block is fixedly provided on the downward side of the bottom edge of the tripod, and when the outer clamping plate fixes the blind pipe, the distance between the two limit blocks is adapted to the top end size of the hanger, and a gap is formed between the bottom ends of the two outer clamping plates for accommodating the hanger.

[0020] The present invention has at least the following beneficial effects:

[0021] 1. The method for pipe jacking in a deep-buried central ditch of a tunnel provided by the present invention can realize the simultaneous construction of the deep-buried central ditch and the tunnel lining structure without interfering with each other; solve the problems of low efficiency, large process connection impact, large excavation consumption, and high construction cost of the traditional drilling and blasting construction method; and reduce the blasting disturbance of the deep-buried central ditch of a single-track railway tunnel, which may cause the bottom of the invert to loosen to a large extent and the lining to be prone to cracks and other quality defects.

[0022] By using the lifting device for connecting blind pipes provided by the present invention, when transporting blind pipes in a tunnel, the top of the lower lifting assembly can be added to the bottom of the upper lifting assembly, so that the blind pipes can be stably placed on the transporter in a vertically stacked manner, making full use of the limited space to load more blind pipes; when lowering the blind pipes, the support wheels are supported on the side walls of the reserved groove, and cooperate with the hanging seat, inner stop block and inner clamping plate to stably clamp and hang the blind pipe in the reserved groove, which is convenient for subsequent connection or reinforcement of the blind pipe; when the reserved groove needs to be backfilled after construction is completed, when the lifting lug is lifted again, the lifting assembly can be detached from the blind pipe, which will not affect subsequent construction, and has a simple structure and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The disclosure of the present invention will become more apparent with reference to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. In the drawings:

[0024] Figure 1 This is a process flow chart of the simultaneous construction of the tunnel lining structure and the tunnel deep-buried central ditch jacking pipe construction method of the present invention;

[0025] Figure 2 This is the construction process flow chart of the traditional deep buried central trench drilling and blasting method;

[0026] Figure 3 This is a schematic diagram of the connection between the transverse water pipes on both sides and the central connecting blind pipe in the tunnel deep-buried central ditch jacking construction method of the present invention;

[0027] Figure 4 This is a schematic diagram of the connection between the deep-buried central ditch jacking pipe, the vertical connecting blind pipe and the middle connecting blind pipe in the deep-buried central ditch jacking pipe construction method of the present invention;

[0028] Figure 5 Schematic diagram of a tunnel deep-buried central ditch drainage system for the tunnel deep-buried central ditch pipe jacking construction method of the present invention;

[0029] Figure 6 This is a schematic diagram of the overall structure of the blind pipe connecting hanger of the present invention when the blind pipe is lowered;

[0030] Figure 7 This is a schematic diagram of the overall structure of the blind pipe connecting hanger of the present invention after the blind pipe is lowered;

[0031] Figure 8 For the present invention Figure 6 Schematic diagram of the support wheel of the spreader connected to the blind pipe being supported on the side wall of the reserved groove;

[0032] Figure 9 This is a schematic structural diagram of a lifting assembly in a lifting device for connecting blind pipes of the present invention;

[0033] Figure 10 This is a schematic diagram of the internal connection structure of the hanger of the present invention;

[0034] Figure 11 For the present invention Figure 10 Enlarged view of point A in the middle;

[0035] Figure 12 It is a schematic diagram of the structure of the suspension seat of the present invention;

[0036] Figure 13 is a cross-sectional view of the boom of the present invention;

[0037] Figure 14 It is a cross-sectional view of the outer stopper of the present invention.

[0038] 1. Inverted arch excavation surface; 2. Pre-reserved groove for middle connecting blind pipe; 3. Middle connecting blind pipe; 4. Horizontal water guide pipe; 5. Vertical connecting blind pipe; 6. Prefabricated deep-buried central water ditch; 7. Primary support structure of inverted arch; 8. Inverted arch concrete; 9. Hanging rod; 10. Hoisting assembly; 11. Hanging seat; 12. Inner splint; 13. Outer splint; 14. Inner stop block; 15. Outer stop block; 16. Support wheel; 17. Locking hook; 18. Lifting ear; 19. Lifting groove; 20. Groove; 21. Through groove; 22. Extrusion block; 23. Transverse spring; 24. Sleeve rod; 25. Sleeve groove; 26. Longitudinal spring; 27. Guide rod; 28. Notch; 29. ​​Through hole; 30. Upper wire rope; 31. Lower wire rope; 32. Accommodating groove; 33. Slider; 34. Slide; 35. Tripod; 36. Limit block. DETAILED DESCRIPTION

[0039] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0040] like Figures 1 to 5 As shown, the first aspect of the present invention provides a method for constructing a deep-buried central trench pipe jacking in a tunnel, comprising:

[0041] Step 1: Inverted arch excavation: The inverted arch excavation is divided into two parts, left and right. After the excavation is completed, the base of the base is cleaned of slag, debris, and accumulated water.

[0042] Step 2: Excavate a reserved groove: excavate a reserved groove for connecting the middle blind pipe in the middle of the inverted arch bottom. The direction of the reserved groove is consistent with the layout direction of the central ditch.

[0043] Step 3: Place the middle connecting blind pipe: Use a crane with a lifting device to place the middle connecting blind pipe into the reserved groove. At the same time, connect the transverse water pipes on both sides to the middle connecting blind pipe, and then backfill the reserved groove for the middle connecting blind pipe.

[0044] Step 4: Install the steel arch frame: When installing the steel arch frame, connect the inverted arch steel arch frame with the steel arch frames at the arch feet of the left and right walls, and use connecting steel plates for welding to form a closed ring.

[0045] Step 5: Inverted arch pouring: First, tie and weld the inverted arch lining reinforcement. After installing the inverted arch formwork, pour the inverted arch concrete to complete the tunnel inverted arch construction.

[0046] Step 6. Construction of the deep-buried central ditch jacking pipe at the bottom of the tunnel: Use conventional jacking construction methods to construct the deep-buried central ditch jacking pipe at the bottom of the tunnel. After the construction of the deep-buried central ditch jacking pipe is completed, drill a hole from the inside to the outside at the center of the pipe top to connect it with the middle connecting blind pipe. At the same time, insert vertical connecting blind pipes in sections to finally form a drainage system.

[0047] like Figures 6 to 9 As shown, the second aspect of the present invention provides a lifting device for connecting blind pipes, which is used for the placement of the middle connecting blind pipe in the above-mentioned tunnel deep-buried central ditch top pipe construction method, wherein the lifting device includes a lifting rod 9 and two lifting assemblies 10 respectively arranged at both ends of the lifting rod 9, and the lifting assembly 10 includes a hanging seat 11 with an open downward arc structure, and both sides of the hanging seat 11 are provided with an inner splint 12 and an outer splint 13 for supporting the blind pipe, which are distributed inside and outside and extend to the bottom of the blind pipe through the bottom end. The tops of the two outer splints 13 are connected to the two An outer stopper 15 and an inner stopper 14 are respectively provided between the top ends of the inner plywood 12, and the outer stopper 15 and the inner stopper 14 are respectively separated from the outer plywood 13 and the inner plywood 12 by moving upward in the hanger 11. The outer side of the outer plywood 13 is provided with a support wheel 16 which is supported by the side wall of the reserved groove when the blind pipe is lowered into the reserved groove to drive the outer plywood 13 to rotate upward and release the blind pipe. The bottom of the outer stopper 15 is provided with a locking hook 17 for lifting the outer stopper 15 to separate from the top end of the outer plywood 13, and both ends of the top of the hanger 9 are provided with lifting ears 18.

[0048] In this embodiment, by simultaneously lifting the lifting assemblies 10 at both ends of the blind pipe, in the process of lowering the blind pipe to the reserved groove, the lifting lug 18 is lifted, driving the lifting rod 9 to move upward, so that the locking hook 17 at the end of the lifting rod 9 lifts the outer stopper 15 to disengage from the outer clamping plate 13. At this time, the outer stopper 15 moves upward to contact the hanging seat 11, driving the hanging seat 11 to move upward. At this time, the bottom ends of the inner clamping plate 12 and the outer clamping plate 13 are both located below the blind pipe and stably clamp the blind pipe. When the hanging seat 11 is lifted, it can clamp the blind pipe and drive the blind pipe to move synchronously to the top of the reserved groove and lower the blind pipe.

[0049] When the support wheel 16 contacts the side wall of the reserved groove, the lifting assembly continues to move downward, and the support wheel 16 is supported by the side wall of the reserved groove, driving the outer clamping plate 13 to rotate upward to the maximum distance, so that the opposite surfaces of the ends of the two outer clamping plates 13 contact the top of the blind pipe, so that the outer clamping plate is in a state of releasing the blind pipe and no longer rotates. At this time, the bottom end of the inner clamping plate 12 is still located below the blind pipe to stably clamp the blind pipe. The blind pipe is located in the reserved groove and is stably supported and suspended by the support wheel 16. Since the reserved groove at the construction site is generally measured by the construction workers, the trench is dug in the soil by the excavator, and then the various surfaces of the trench are compacted, so the side walls of the reserved groove are still soil. When the support wheel 16 rotates to release the blind pipe, there is a probability that the side walls of the reserved groove will be crushed, resulting in the lifting assembly 10 running unsmoothly. Therefore, in the process of lifting and lowering the blind pipe, a thinner plate is placed on the side wall surface of the reserved pipe under the support wheel 16, which can well assist the lifting assembly 10 in lowering the blind pipe.

[0050] like Figures 9 to 12 As shown, a lifting groove 19 is provided in the hanging seat 11 , and the outer stopper 15 is slidably provided in the lifting groove 19 , and the outer stopper 15 is supported on the inner top wall of the lifting groove 19 when it is separated from the top end of the outer clamping plate 13 .

[0051] In this embodiment, when the lifting ear 18 is lifted and drives the lifting rod 9 to move upward, the locking hook 17 at the end of the lifting rod 9 lifts the outer stop block 15 to separate from the outer splint 13, and the outer stop block 15 slides upward in the lifting groove 19 in the hanging seat 11. The top surface of the outer stop block 15 can support the inner top surface of the hanging seat 11.

[0052] like Figure 11 and Figure 14 As shown, a groove 20 is provided at the bottom of the outer stopper 15, the locking hook 17 is located in the groove 20, and the top end of the locking hook 17 supports the inner top wall of the groove 20, and a through groove 21 is provided on the outer stopper 15 for the end of the boom 9 to be inserted downward into the groove 20.

[0053] In this embodiment, when the construction workers lift the lifting group and lower the blind pipe, the lifting rod 9 is driven upward by the lifting ear 18, so that the locking hook 17 at the end of the lifting rod 9 contacts and supports the inner top wall of the groove 20, and can lift the outer stop block 15 to slide in the height direction within the lifting groove 19.

[0054] like Figure 10 、 Figure 11 and Figure 13As shown, the lower surface of the lock hook 17 is an inclined surface, and the lock hook 17 can be telescopically arranged at the end of the suspension rod 9, and a transverse spring 23 is provided in the suspension rod 9 to keep the lock hook 17 in the extended state. The outer splint 13 is provided with an extrusion block 22 located just below the inclined surface of the lock hook 17 when it is in the released blind pipe state, and the extrusion block 22 is flush with the side wall of the through groove 21 in the extension direction of the lock hook 17. When the suspension rod 9 and the outer stopper 15 are reset downward, the extrusion block 22 squeezes the lock hook 17 into the suspension rod 9 by inserting into the groove 20, and the inner top wall of the groove 20 is supported by the top of the extrusion block 22. The top of the inner stopper 14 is provided with a sleeve rod 24, and a sleeve groove 25 is provided on the suspension rod 9, and the top end of the sleeve rod 24 is inserted into the sleeve groove 25. When the outer stopper 15 is separated from the outer splint 13, the top end of the sleeve rod 24 is supported on the inner bottom wall of the sleeve groove 25.

[0055] In this embodiment, when the blind tube is lowered, the lifting lug 18 drives the suspension rod 9 to move upward, so that the sleeve groove 25 moves upward until the inner bottom wall contacts the top support sleeve rod 24, and the outer stopper 15 is separated from the outer clamping plate 13 and supports the inner top wall of the suspension seat 11;

[0056] When the blind tube is lowered into the reserved groove and is hung stably, the outer splint 13 is in a state of releasing the blind tube. Since the outer stopper 15 is lifted and supports the inner top surface of the hanger 11, the extrusion block 22 can be displaced to just below the inclined surface of the lock hook 17. At this time, since the blind tube is lowered, the crane can be unhooked from the lifting ear 18. The lifting ear 18 and the suspension rod 9 lose the pulling force of the crane and reset downward under the influence of gravity, so that the inner stopper 14 slides downward and resets in the lifting groove 19. During the resetting process of the inner stopper 14, the extrusion block 22 contacts the inclined surface of the lock hook 17, squeezes the lock hook 17 and compresses the transverse spring 23, so that the lock hook 17 is stored in the suspension rod 9. At this time, the top surface of the extrusion block 22 contacts and supports the top surface of the groove 20, so that the extrusion block 22 can support the outer stopper 15.

[0057] like Figure 11 As shown, a longitudinal spring 26 is provided in the hanger 11 , and one end of the longitudinal spring 26 is connected to the outer stopper 15 , so as to provide elastic force for the outer stopper 15 to maintain the lowest position.

[0058] In this embodiment, when the outer stop block 15 is reset, the longitudinal spring 26 provides a downward elastic force to the outer stop block 15, so that the inclined surface of the locking hook 17 inside the outer stop block 15 exerts downward pressure on the extrusion block 22, so that the locking hook 17 is squeezed by the extrusion block 22 to compress the transverse spring 23 and be stored in the suspension rod 9, so that the locking hook 17 is separated from the outer stop block 15.

[0059] like Figure 11 and Figure 14As shown, the upper surface of the inner stopper 14 is provided with guide rods 27 respectively located on both sides of the sleeve rod 24, the sleeve rod 24 is hollow, and a notch 28 is provided on the side of the sleeve rod 24 facing the guide rod 27, and a through hole 29 is provided at the top of the sleeve rod 24. The through hole 29 is penetrated by an upper steel wire rope 30 whose top end is fixed to the inner top wall of the sleeve groove 25, and the bottom end of the upper steel wire rope 30 is connected to two lower steel wire ropes 31 respectively passing through the notch 28, and the bottom end of the lower steel wire rope 31 is connected to the outer side surface of the inner splint 12 after passing through the bottom of the guide rod 27, and when the outer stopper 15 is upwardly separated from the outer splint 13, the lower steel wire rope 31 is in a fluffy state.

[0060] In this embodiment, when the outer stopper 15 is separated from the outer clamping plate 13, the steel wire rope is in a fluffy state, and the steel wire rope does not generate tension on the inner stopper 14, causing the inner clamping plate 12 to forcibly squeeze the inner stopper 14;

[0061] When the reserved groove needs to be backfilled after the construction is completed, the hoisting assembly 10 needs to be separated from the blind pipe, and the crane connection lifting lug 18 is lifted upward, so that the lifting lug 18 drives the boom 9 to move upward. Since the locking hook 17 is located in the boom 9 at this time, during the upward displacement of the boom 9, the locking hook 17 will not drive the outer stopper 15 to move upward, so that the locking hook 17 can be separated from the outer stopper 15 during the upward displacement of the boom 9;

[0062] At this time, the lifting ear 18 continues to move upward, and the inner bottom wall of the sleeve groove 25 supports the top of the sleeve rod 24, driving the sleeve rod 24 to move upward. The sleeve rod 24 drives the inner stop block 14 to disengage from the inner splint 12. At this time, the wire rope is tightened and continues to rise. The lifting ear 18 continues to rise, and the bottom end of the lower wire rope 31 is connected to the inner splint 12, driving the inner splint 12 to rotate upward until it is in a state of releasing the blind pipe. At this time, the lifting ear 18 continues to rise, which can drive the lifting assembly 10 to rise and disengage from the blind pipe.

[0063] like Figures 11 to 14 As shown, the side surfaces of the inner stopper 14 and the inner clamping plate 12 are both inclined surfaces with the top end tilted outwards, and accommodating grooves 32 for accommodating the wire rope are opened on both sides of the hanging seat 11.

[0064] In this embodiment, when the wire rope is tightened, when the inner stop block 14 is brought onto the platform, the inclined surface of the inner clamping plate 12 provides an upward thrust to the inner stop block 14, so that the inner stop block 14 can be more smoothly separated from the inner clamping plate 12; when the locking hook 17 is separated from the outer stop block 15, the lifting ear rises to tighten the wire rope, and the receiving groove 32 is an inclined groove with the top facing outward, so that the wire rope is in an inclined upward state, which provides an upward auxiliary force for lifting the inner stop block 14.

[0065] like Figure 10 and Figure 12As shown, the outer clamping plate 13 is provided with a slider 33 with an L-shaped cross section on the axial outer side of the blind tube, and the inner clamping plate 12 is provided with an L-shaped cross section on the axial inner side of the blind tube. The hanging seat 11 is provided with a sliding groove 34 that slides with the slider 33.

[0066] In this embodiment, the slide groove 34 has a guiding function for the inner plate 12 and the outer plate 13, enabling the inner plate 12 and the outer plate 13 to rotate in the circumferential direction of the blind tube and limiting the maximum distance that the inner plate 12 and the outer plate 13 can rotate downward under the action of gravity.

[0067] like Figures 6 to 10 As shown, a tripod 35 is provided on the outer surface of the outer splint 13, and the support wheel 16 is rotatably installed at the top of the tripod 35. A limit block 36 is fixedly provided on the downward side of the bottom edge of the tripod 35, and when the outer splint 13 fixes the blind pipe, the distance between the two limit blocks 36 is adapted to the top size of the hanger 11, and a gap is formed between the bottom ends of the two outer splints 13 for accommodating the hanger 11.

[0068] In this embodiment, during transportation, the lifting assembly 10 can be installed on the blind tube in advance, and the bottom limit block 36 and the supporting wheel of the tripod 35 can support the blind tube. After the lifting assembly 10 is installed on the blind tube, the blind tube can be placed in a stacked manner, and the hanging seat 11 located on the lower blind tube can be stuck in the gap at the bottom end of the two outer splints 13 of the upper blind tube, so that the blind tube is more stable during transportation.

[0069] The technical scope of the present invention is not limited to the contents of the above description. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical concept of the present invention, and these deformations and modifications should all fall within the scope of the present invention.

Claims

1. A method for constructing a deep-buried central ditch pipe jacking in a tunnel, characterized in that: include: Step 1: Inverted arch excavation: The inverted arch excavation is divided into two parts, left and right. After the excavation is completed, the base of the base is cleaned of slag, debris, and accumulated water. Step 2: Excavate a reserved groove: excavate a reserved groove for connecting the middle blind pipe in the middle of the inverted arch bottom. The direction of the reserved groove is consistent with the layout direction of the central ditch. Step 3: Place the middle connecting blind pipe: Use a crane with a lifting device to place the middle connecting blind pipe into the reserved groove. At the same time, connect the transverse water pipes on both sides to the middle connecting blind pipe, and then backfill the reserved groove for the middle connecting blind pipe. Step 4: Install the steel arch frame: When installing the steel arch frame, connect the inverted arch steel arch frame with the steel arch frames at the arch feet of the left and right walls, and use connecting steel plates for welding to form a closed ring. Step 5: Inverted arch pouring: First, tie and weld the inverted arch lining reinforcement. After installing the inverted arch formwork, pour the inverted arch concrete to complete the tunnel inverted arch construction. Step 6: Construction of the deep-buried central ditch pipe at the bottom of the tunnel: Use conventional pipe jacking construction methods to construct the deep-buried central ditch pipe at the bottom of the tunnel. After the deep-buried central ditch pipe jacking construction is completed, drill a hole from the inside to the outside at the center of the pipe top to connect it with the middle connecting blind pipe. At the same time, vertical connecting blind pipes are inserted in sections to finally form a drainage system. The hanger for placing the middle connecting blind pipe includes a hanger (9) and two hanging components (10) respectively arranged at both ends of the hanger (9), the hanging component (10) includes a hanger (11) with an open downward arc structure, both sides of the hanger (11) are provided with inner clamping plates (12) and outer clamping plates (13) distributed inside and outside and extending through the bottom end to the bottom of the blind pipe for supporting the blind pipe, and outer stoppers (15) and inner stoppers (14) are respectively provided between the top ends of the two outer clamping plates (13) and between the top ends of the two inner clamping plates (12). The outer stopper (15) and the inner stopper (14) are respectively separated from the outer splint (13) and the inner splint (12) by moving upward in the hanger (11); the outer side of the outer splint (13) is provided with a support wheel (16) which is supported by the side wall of the reserved groove when the blind pipe is lowered into the reserved groove to drive the outer splint (13) to rotate upward and release the blind pipe; the bottom of the outer stopper (15) is provided with a locking hook (17) for lifting the outer stopper (15) to separate from the top of the outer splint (13); and both ends of the top of the suspension rod (9) are provided with lifting ears (18).

2. A method for constructing a deep-buried central ditch pipe in a tunnel as claimed in claim 1, characterized in that: A lifting groove (19) is provided in the hanging seat (11), the outer stopper (15) is slidably provided in the lifting groove (19), and the outer stopper (15) is supported on the inner top wall of the lifting groove (19) when it is separated from the top end of the outer clamping plate (13).

3. A method for constructing a deep-buried central ditch pipe in a tunnel as claimed in claim 1, characterized in that: A groove (20) is provided at the bottom of the outer stopper (15), the locking hook (17) is located in the groove (20), and the top end of the locking hook (17) supports the inner top wall of the groove (20), and a through groove (21) is provided on the outer stopper (15) for inserting the end of the suspension rod (9) downward into the groove (20).

4. A method for constructing a deep-buried central ditch pipe in a tunnel as claimed in claim 3, characterized in that: The lower surface of the lock hook (17) is an inclined surface. The lock hook (17) is telescopically arranged at the end of the suspension rod (9), and a transverse spring (23) is arranged in the suspension rod (9) to keep the lock hook (17) in an extended state. The outer clamping plate (13) is provided with an extrusion block (22) located directly below the inclined surface of the lock hook (17) when the outer clamping plate (13) is in a released blind pipe state. The extrusion block (22) is flush with the side wall of the through groove (21) on the side facing the lock hook (17) in the extension direction of the lock hook (17). The suspension rod (9) and the outer stop block ( When the inner stopper (14) is reset downward, the extrusion block (22) is inserted into the groove (20) to squeeze the lock hook (17) into the suspension rod (9), and the inner top wall of the groove (20) is supported by the top of the extrusion block (22). The top of the inner stopper (14) is provided with a sleeve rod (24), and the suspension rod (9) is provided with a sleeve groove (25), and the top end of the sleeve rod (24) is inserted into the sleeve groove (25). When the outer stopper (15) is separated from the outer splint (13), the top end of the sleeve rod (24) is supported on the inner bottom wall of the sleeve groove (25).

5. A method for constructing a deep-buried central ditch pipe in a tunnel as claimed in claim 4, characterized in that: A longitudinal spring (26) is provided in the hanger (11), one end of the longitudinal spring (26) is connected to the outer stopper (15) and is used to provide elastic force for the outer stopper (15) to maintain the lowest position.

6. A method for constructing a deep-buried central ditch pipe in a tunnel as claimed in claim 4, characterized in that: The upper surface of the inner stopper (14) is provided with guide rods (27) respectively located on both sides of the sleeve rod (24), the sleeve rod (24) is hollow, and a notch (28) is provided on the side of the sleeve rod (24) facing the guide rod (27), and a through hole (29) is provided at the top of the sleeve rod (24), and an upper steel wire rope (30) whose top is fixed to the inner top wall of the sleeve groove (25) is passed through the through hole (29), and the bottom end of the upper steel wire rope (30) is connected to two lower steel wire ropes (31) respectively passing through the notch (28), and the bottom end of the lower steel wire rope (31) is connected to the outer side surface of the inner splint (12) after passing through the bottom of the guide rod (27), and when the outer stopper (15) is separated from the outer splint (13) upward, the lower steel wire rope (31) is in a fluffy state.

7. A method for constructing a deep-buried central ditch pipe in a tunnel as claimed in claim 6, characterized in that: The side surfaces of the inner stopper (14) and the inner clamping plate (12) opposite to each other are both inclined surfaces with their top ends tilted outwards, and receiving grooves (32) for receiving the steel wire rope are provided on both sides of the hanging seat (11).

8. The method for constructing a deep-buried central ditch pipe in a tunnel according to claim 1, wherein: The outer clamping plate (13) is provided with a sliding block (33) with an L-shaped cross section on the axial outer side of the blind tube, and the inner clamping plate (12) is provided with an L-shaped cross section on the axial inner side of the blind tube. The hanging seat (11) is provided with a sliding groove (34) that is slidably matched with the sliding block (33).

9. A method for constructing a deep-buried central ditch pipe in a tunnel as claimed in claim 1, characterized in that: A tripod (35) is provided on the outer surface of the outer clamping plate (13), and the supporting wheel (16) is rotatably mounted on the vertex of the tripod (35). A limit block (36) is fixedly provided on the downward side of the bottom edge of the tripod (35), and when the outer clamping plate (13) fixes the blind pipe, the distance between the two limit blocks (36) is adapted to the top size of the hanger (11), and a gap for accommodating the hanger (11) is formed between the bottom ends of the two outer clamping plates (13).

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