Tunnel deeply-buried central ditch pipe jacking construction method and lifting appliance for connecting blind pipes

Abstract

The invention belongs to the technical field of tunnel drainage construction, and particularly relates to a tunnel deep-buried central ditch pipe-jacking construction method and a lifting appliance for connecting blind pipe, the tunnel deep-buried central ditch pipe-jacking construction method comprises the following steps: step 1, excavating an inverted arch; secondly, a reserved groove is excavated; the middle connecting blind pipe is placed in the reserved groove through cooperation of a crane and a lifting appliance, meanwhile, transverse water guide pipes on the two sides are connected into the middle connecting blind pipe, and then the reserved groove of the middle connecting blind pipe is backfilled; step 4, mounting a steel arch; 5, inverted arch pouring operation is carried out; and 6, pipe jacking construction of the deeply-buried central ditch at the bottom of the tunnel: after the pipe jacking construction of the deeply-buried central ditch is completed, drilling a hole in the center of the top of the pipe from inside to outside to be communicated with a middle connecting blind pipe, and meanwhile, inserting vertical connecting blind pipes in sections to finally form a drainage system. The construction method has the advantages that synchronous construction of the deeply-buried central ditch and the tunnel lining structure is achieved, mutual interference is avoided, and the construction efficiency is high.

Description

Technical Field

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

[0002] With the continuous expansion of the scale of railway construction in China, the number of railway tunnels built in alpine and high-altitude regions is increasing. To ensure smooth drainage in tunnels in alpine regions and effectively prevent tunnel frost heaving, a central deep-buried water ditch is mostly arranged at the bottom of the inverted arch of the tunnel. Due to the limited construction space of the water ditch, there is interference with the initial support process of the inverted arch. The construction of the water ditch 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. During subsequent construction, the blind pipes need to be installed and fixed separately and then connected to other pipes, and the process is relatively cumbersome. Summary of the Invention

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

[0004] To achieve the foregoing object, the first aspect of the present invention provides a construction method for jacking pipes of a deep-buried central water ditch in a tunnel, including: Step 1, Inverted arch excavation: The inverted arch excavation is divided into left and right parts. After the excavation is completed, the base loose slag, sundries, and accumulated water are cleaned up; Step 2, Excavating a reserved groove: A reserved groove for connecting the middle blind pipe is excavated in the middle of the inverted arch bottom, and the direction of the reserved groove is consistent with the layout direction of the central water ditch; Step 3, Placing the middle connecting blind pipe: Use a crane in cooperation with a sling to place the middle connecting blind pipe into the reserved groove. At the same time, after connecting the lateral water conduits on both sides to the middle connecting blind pipe, backfill the reserved groove of the middle connecting blind pipe; Step 4, Installing 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 side walls, and use connecting steel plates for welding to play a role in closing the loop; Step 5, Inverted arch pouring operation: First, carry out the binding and welding of the inverted arch lining steel bars. After installing the inverted arch formwork, pour the inverted arch concrete to complete the construction operation of the tunnel inverted arch; Step 6, Construction of the deep-buried central water ditch jacking pipe at the bottom of the tunnel: Use the conventional jacking pipe construction method to construct the deep-buried central water ditch jacking pipe at the bottom of the tunnel. After the construction of the deep-buried central water ditch jacking pipe is completed, drill holes from the inside to the outside at the center of the pipe top to communicate with the middle connecting blind pipe, and at the same time, insert vertical connecting blind pipes in sections to finally form a drainage system.

[0005] The second aspect of the present invention provides a sling for connecting a blind pipe, which is applied to the placement operation of the blind pipe connected in the middle of the above-mentioned pipe jacking construction method for the deep-buried central drainage ditch of the tunnel. Optionally, the sling includes a suspension rod and two lifting assemblies respectively arranged at both ends of the suspension rod. The lifting assembly includes a hanging seat with an open-downward arc-shaped structure. Inner clamping plates and outer clamping plates for supporting the blind pipe are arranged on both sides of the hanging seat in an inner and outer distribution and extend to the bottom of the blind pipe through the bottom end. An outer stop block and an inner stop block are respectively arranged between the tops of the two outer clamping plates and between the tops of the two inner clamping plates. The outer stop block and the inner stop block are respectively disengaged from the outer clamping plate and the inner clamping plate by upward displacement in the hanging seat. A support wheel is arranged on the outer side of the outer clamping plate, which is supported by the side wall of the reserved groove to drive the outer clamping plate to rotate upward and release the blind pipe when the blind pipe is lowered into the reserved groove. A locking hook for lifting the outer stop block away from the top of the outer clamping plate is arranged at the bottom of the outer stop block. Hanging ears are arranged at both ends of the top of the suspension rod.

[0006] In the sling for connecting a blind pipe as described above, optionally, a lifting groove is arranged in the hanging seat, the outer stop block is slidably arranged in the lifting groove, and when the outer stop block disengages from the top of the outer clamping plate, it is supported on the inner top wall of the lifting groove.

[0007] In the sling for connecting a blind pipe as described above, optionally, a groove is arranged 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. A through groove for the end of the suspension rod to be inserted downward into the groove is arranged on the outer stop block.

[0008] In the sling for connecting a 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 suspension rod, and a transverse spring for keeping the locking hook in the extended state is arranged in the suspension rod. An extrusion block is arranged on the outer clamping plate and is located directly below the inclined surface of the locking hook when the outer clamping plate is in the state of releasing the blind pipe. One side surface of the extrusion block facing the locking hook in the telescopic direction of the locking hook is flush with the side wall of the through groove. When the suspension rod and the outer stop block are reset downward, the extrusion block squeezes the locking hook into the suspension rod by inserting into the groove, and the inner top wall of the groove is supported by the top of the extrusion block. A sleeve rod is arranged at the top of the inner stop block, a sleeve groove is arranged on the suspension rod, and the top end of the sleeve rod is inserted into the sleeve groove. When the outer stop block disengages from the outer clamping plate, the top end of the sleeve rod is supported on the inner bottom wall of the sleeve groove.

[0009] In the sling for connecting a blind pipe as described above, optionally, a longitudinal spring is arranged in the hanging seat, and one end of the longitudinal spring is connected to the outer stop block to provide an elastic force for keeping the outer stop block at the lowest position.

[0010] In the sling for connecting the blind pipe as described above, optionally, guide rods are provided on the upper surface of the inner stopper and are respectively located on both sides of the sleeve rod. The sleeve rod is hollow, and a notch is formed on one side of the sleeve rod facing the guide rod. A through hole is formed at the top end of the sleeve rod, and an upper steel wire rope with the top end fixedly connected to the inner top wall of the sleeve groove passes through the through hole. The bottom end of the upper steel wire rope is connected to two lower steel wire ropes respectively passing through the notch, and the bottom ends of the lower steel wire ropes are connected to the outer side surfaces of the inner clamping plates after passing through the bottom of the guide rods. When the outer stopper moves upward away from the outer clamping plate, the lower steel wire ropes are in a fluffy state.

[0011] In the sling for connecting the blind pipe as described above, optionally, the opposite side surfaces of the inner stopper and the inner clamping plate are both inclined planes with the top ends inclined outward. Accommodation grooves for accommodating the steel wire ropes are formed on both sides inside the hanging seat.

[0012] In the sling for connecting the blind pipe as described above, optionally, sliders with an "L"-shaped cross section are provided on the outer side of the outer clamping plate in the axial direction of the blind pipe and on the inner side of the inner clamping plate in the axial direction of the blind pipe. Sliding grooves for slidingly cooperating with the sliders are provided on the hanging seat.

[0013] In the sling for connecting the blind pipe as described above, optionally, a triangular frame is provided on the outer surface of the outer clamping plate. The supporting wheel is rotatably installed at the vertex of the triangular frame. A limiting block is fixedly provided on the side with the bottom edge of the triangular frame facing downward. When the outer clamping plate fixes the blind pipe, the distance between the two limiting blocks is adapted to the top dimension of the hanging seat, and a gap for accommodating the hanging seat is formed between the bottom ends of the two outer clamping plates.

[0014] The present invention has at least the following beneficial effects: 1. By applying the construction method of the deep-buried central drainage ditch of the tunnel provided by the present invention, the synchronous construction of the deep-buried central drainage ditch and the tunnel lining structure is realized without mutual interference; problems such as low work efficiency of the traditional drill and blast method, large influence on the connection of processes, large over-excavation consumption, and high construction cost are solved; the blasting disturbance of the bottom of the inverted arch of the deep-buried central drainage ditch of the single-track railway tunnel is reduced, and the loosening range is large, and quality defects such as cracks are prone to appear in the lining.

[0015] By applying the sling for connecting the blind pipe provided by the present invention, when transferring the blind pipe in the tunnel, the top of the lower lifting assembly can be inserted into 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 pipe, the supporting wheel supports on the side wall of the reserved groove, and cooperates with the hanging seat, the inner stopper and the inner clamping plate to stably clamp and suspend the blind pipe in the reserved groove, facilitating subsequent connection or reinforcement treatment of the blind pipe; when it is necessary to backfill the reserved groove after the construction is completed, when the lifting lug is lifted again, the lifting assembly can be separated from the blind pipe without affecting the subsequent construction, and the structure is simple and easy to use. Description of the Drawings

[0016] With reference to the accompanying drawings, the disclosure of the present invention will become more apparent. 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 figures: Figure 1 is the process flow diagram of the synchronous construction of the tunnel deep-buried central drainage ditch pipe jacking construction and the tunnel lining structure of the tunnel deep-buried central drainage ditch pipe jacking construction method of the present invention; Figure 2 is the process flow diagram of the traditional deep-buried central drainage ditch drill and blast method construction; Figure 3 is the schematic diagram of the connection between the lateral drainage pipes on both sides and the middle connecting blind pipe of the tunnel deep-buried central drainage ditch pipe jacking construction method of the present invention; Figure 4 is the schematic diagram of the connection between the deep-buried central drainage ditch pipe jacking, the vertical connecting blind pipe and the middle connecting blind pipe of the tunnel deep-buried central drainage ditch pipe jacking construction method of the present invention; Figure 5 is the schematic diagram of the tunnel deep-buried central drainage ditch drainage system of the tunnel deep-buried central drainage ditch pipe jacking construction method of the present invention; Figure 6 is the overall structure schematic diagram of the spreader of the connecting blind pipe of the present invention when lowering the blind pipe; Figure 7 is the overall structure schematic diagram of the spreader of the connecting blind pipe of the present invention after the blind pipe is lowered; Figure 8 is of the present invention Figure 6 schematic diagram of the supporting wheel of the spreader of the connecting blind pipe in the present invention supporting on the side wall of the reserved groove; Figure 9 is the structure schematic diagram of the hoisting assembly in the spreader of the connecting blind pipe of the present invention; Figure 10 is the internal connection structure schematic diagram of the hanging seat of the present invention; Figure 11 is of the present invention Figure 10 enlarged view at A in; Figure 12 is the structure schematic diagram of the hanging seat of the present invention; Figure 13 is the sectional view of the suspender of the present invention; Figure 14 is the sectional view of the outer stop block of the present invention.

[0017] Reference numerals: 1, invert excavation surface; 2, reserved groove for middle connecting blind pipe; 3, middle connecting blind pipe; 4, transverse water conduit; 5, vertical connecting blind pipe; 6, precast deep-buried central water channel; 7, invert primary support structure; 8, invert concrete; 9, suspender; 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 lug; 19, lifting groove; 20, groove; 21, through groove; 22, extrusion block; 23, transverse spring; 24, sleeve rod; 25, sleeve groove; 26, longitudinal spring; 27, guiding rod; 28, notch; 29, through hole; 30, upper steel wire rope; 31, lower steel wire rope; 32, accommodating groove; 33, slider; 34, sliding groove; 35, tripod; 36, limit block. Detailed implementation manners

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Apparently, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] As Figures 1 to 5 shown, the first aspect of the present invention provides a jacking construction method for a deep-buried central water channel in a tunnel, including: Step 1, invert excavation: The invert excavation is divided into left and right parts. After the excavation is completed, the base loose slag, sundries, and accumulated water are cleaned up; Step 2, excavation of reserved groove: A reserved groove for the middle connecting blind pipe is excavated in the middle of the invert bottom, and the direction of the reserved groove is the same as the layout direction of the central water channel; Step 3, placement of middle connecting blind pipe: The middle connecting blind pipe is placed into the reserved groove by using a crane in cooperation with a lifting tool. At the same time, after the transverse water conduits on both sides are connected to the middle connecting blind pipe, the reserved groove of the middle connecting blind pipe is backfilled; Step 4, installation of steel arch frame: When installing the steel arch frame, the invert steel arch frame is connected to the steel arch frames at the arch feet of the left and right side walls and welded with connecting steel plates to play a role in closing into a ring; Step 5, invert pouring operation: First, the invert lining steel bars are tied and welded. After installing the invert formwork, the invert concrete is poured to complete the invert construction operation of the tunnel; Step 6, jacking construction of the deep-buried central water channel at the bottom of the tunnel: The jacking construction of the deep-buried central water channel at the bottom of the tunnel is carried out by using the conventional jacking construction method. After the jacking construction of the deep-buried central water channel is completed, a hole is drilled from the inside to the outside at the center of the pipe top to communicate with the middle connecting blind pipe, and the vertical connecting blind pipes are inserted in sections to finally form a drainage system.

[0020] AsFigures 6 to 9 As shown in the figure, the second aspect of the present invention provides a sling for connecting a blind pipe, which is applied to the placement operation of the middle connecting blind pipe in the above-mentioned pipe jacking construction method for the deep-buried central drainage ditch of the tunnel. Among them, the sling includes a suspension rod 9 and two lifting components 10 respectively arranged at both ends of the suspension rod 9. The lifting component 10 includes a hanging seat 11 with an open downward arc structure. Inner clamping plates 12 and outer clamping plates 13 for supporting the blind pipe are arranged on both sides of the hanging seat 11 in an inner and outer distribution and extend to the bottom of the blind pipe through the bottom end. Outer stoppers 15 and inner stoppers 14 are respectively arranged between the tops of the two outer clamping plates 13 and between the tops of the two inner clamping plates 12. The outer stoppers 15 and the inner stoppers 14 are respectively disengaged from the outer clamping plates 13 and the inner clamping plates 12 by upward displacement in the hanging seat 11. A supporting wheel 16 is arranged on the outer side of the outer clamping plate 13, 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 clamping plate 13 to rotate upward and release the blind pipe. A locking hook 17 for lifting the outer stopper 15 away from the top of the outer clamping plate 13 is arranged at the bottom of the outer stopper 15. Suspension lugs 18 are arranged at both ends of the top of the suspension rod 9.

[0021] In this embodiment, during the process of lowering the blind pipe into the reserved groove by simultaneously lifting the lifting components 10 at both ends of the blind pipe, the suspension lugs 18 are lifted, driving the suspension rod 9 to move upward, so that the locking hook 17 at the end of the suspension rod 9 lifts the outer stopper 15 away from the outer clamping plate 13. At this time, the outer stopper 15 moves upward and contacts 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 to 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 above the reserved groove and lower the blind pipe. When the supporting wheel 16 contacts the side wall of the reserved groove, the lifting component continues to move downward. The supporting 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. The opposite surfaces at the ends of the two outer clamping plates 13 contact at the top of the blind pipe, making the outer clamping plate in a state of releasing the blind pipe and no longer rotating. 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, stably supported and suspended by the supporting wheel 16. Since the reserved groove at the construction site is generally dug by an excavator in the soil after measurement by construction workers, and then the surfaces of the gully are compacted, the side wall of the reserved groove is still soil. When the supporting wheel 16 rotates to release the blind pipe, there is a probability of damaging the side wall of the reserved groove, resulting in the smooth operation of the lifting component 10 being affected. Therefore, during the process of hoisting and lowering the blind pipe, placing a thinner board on the side wall surface of the reserved pipe below the supporting wheel 16 can well assist the lifting component 10 in lowering the blind pipe.

[0022] As Figures 9 to 12 shown, a lifting groove 19 is arranged in the hanging seat 11. The outer stopper 15 is slidably arranged in the lifting groove 19, and when the outer stopper 15 disengages from the top of the outer clamping plate 13, it is supported on the inner top wall of the lifting groove 19.

[0023] In this embodiment, when the lifting lug 18 is lifted to drive the hanging rod 9 to move upward, the hook 17 at the end of the hanging rod 9 is lifted, and the outer stopper 15 is disengaged from the outer clamping plate 13. The outer stopper 15 slides upward in the lifting groove 19 in the hanging seat 11, and the top surface of the outer stopper 15 can support the inner top surface of the hanging seat 11.

[0024] As Figure 11 and Figure 14 shown, a groove 20 is provided at the bottom of the outer stopper 15. The hook 17 is located in the groove 20, and the top end of the hook 17 supports the inner top wall of the groove 20. A through groove 21 for the end of the hanging rod 9 to be inserted downward into the groove 20 is provided on the outer stopper 15.

[0025] In this embodiment, when the construction worker hoists the hoisting group and lowers the blind pipe, the hanging rod 9 is driven by the lifting lug 18 to move upward, so that the hook 17 at the end of the hanging rod 9 contacts and supports the inner top wall of the groove 20, and can lift the outer stopper 15 to slide in the height direction in the lifting groove 19.

[0026] As Figure 10 , Figure 11 and Figure 13 shown, the lower surface of the hook 17 is a slope. The hook 17 is telescopically arranged at the end of the hanging rod 9, and a transverse spring 23 for keeping the hook 17 in the extended state is arranged in the hanging rod 9. An extrusion block 22 is provided on the outer clamping plate 13 and is located directly below the slope of the hook 17 when it is in the state of releasing the blind pipe. One side surface of the extrusion block 22 facing the hook 17 in the telescopic direction of the hook 17 is flush with the side wall of the through groove 21. When the hanging rod 9 and the outer stopper 15 are reset downward, the extrusion block 22 squeezes the hook 17 into the hanging 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. A sleeve rod 24 is provided at the top of the inner stopper 14, and a sleeve groove 25 is provided on the hanging rod 9. The top end of the sleeve rod 24 is inserted into the sleeve groove 25. When the outer stopper 15 is disengaged from the outer clamping plate 13, the top end of the sleeve rod 24 supports on the inner bottom wall of the sleeve groove 25.

[0027] In this embodiment, when lowering the blind pipe, the lifting lug 18 drives the hanging rod 9 to move upward, so that when the sleeve groove 25 moves upward until the inner bottom wall contacts the top end of the sleeve rod 24 to support the sleeve rod 24, the outer stopper 15 is disengaged from the outer clamping plate 13 and supports the inner top wall of the hanging seat 11; When the blind pipe is lowered into the reserved groove and stably suspended, the outer clamping plate 13 is in a state of releasing the blind pipe at this time. Since the outer stopper 15 is lifted and supports the inner top surface of the hanging seat 11, the squeezing block 22 can be displaced to directly below the inclined surface of the locking hook 17. At this time, since the lowering of the blind pipe is completed, the crane can be unhooked from the lifting ear 18. The lifting ear 18 and the lifting rod 9 lose the pulling force of the crane and reset downward under the influence of gravity, causing the inner stopper 14 to slide downward and reset in the lifting groove 19. During the resetting process of the inner stopper 14, the squeezing block 22 contacts and presses the inclined surface of the locking hook 17 to compress the transverse spring 23, causing the locking hook 17 to be received into the lifting rod 9. At this time, the top surface of the squeezing block 22 contacts and supports the top surface of the groove 20, enabling the squeezing block 22 to support the outer stopper 15.

[0028] As Figure 11 shown, a longitudinal spring 26 is arranged inside the hanging seat 11. One end of the longitudinal spring 26 is connected to the outer stopper 15, and is used to provide an elastic force for the outer stopper 15 to maintain the lowest position.

[0029] In this embodiment, when the outer stopper 15 is reset, the longitudinal spring 26 provides a downward elastic force to the outer stopper 15, so that the inclined surface of the locking hook 17 inside the outer stopper 15 has a downward pressure on the squeezing block 22, facilitating the squeezing block 22 to compress the transverse spring 23 by squeezing the locking hook 17 and receiving it into the lifting rod 9, so that the locking hook 17 is disengaged from the outer stopper 15.

[0030] As Figure 11 and Figure 14 shown, guide rods 27 are arranged on the upper surface of the inner stopper 14 on both sides of the sleeve rod 24 respectively. The sleeve rod 24 is hollow, and a notch 28 is opened on the side of the sleeve rod 24 facing the guide rod 27. A through hole 29 is opened at the top end of the sleeve rod 24. An upper steel wire rope 30 whose top end is fixedly connected to the inner top wall of the sleeve groove 25 passes through the through hole 29. The bottom end of the upper steel wire rope 30 is connected with two lower steel wire ropes 31 respectively passing through the notch 28, and the bottom ends of the lower steel wire ropes 31 are connected to the outer side surface of the inner clamping plate 12 after passing through the bottom of the guide rod 27. When the outer stopper 15 disengages from the outer clamping plate 13 upward, the lower steel wire ropes 31 are in a fluffy state.

[0031] In this embodiment, when the outer stopper 15 disengages from the outer clamping plate 13, the steel wire ropes are in a fluffy state, and the steel wire ropes will not generate a pulling force on the inner stopper 14 to cause the inner clamping plate 12 to forcibly squeeze the inner stopper 14; When backfilling the reserved groove is required after the construction is completed, the hoisting assembly 10 needs to be disengaged from the blind pipe. The crane is connected to the lifting ear 18 and lifted upward, causing the lifting ear 18 to drive the lifting rod 9 to move upward. Since the locking hook 17 is located inside the lifting rod 9 at this time, during the upward displacement of the lifting rod 9, the locking hook 17 will not drive the outer stopper 15 to move upward, enabling the locking hook 17 to disengage from the outer stopper 15 during the upward displacement of the lifting rod 9; At this time, the lifting lug 18 continues to move upward. The inner bottom wall of the socket groove 25 supports the top of the socket rod 24, driving the socket rod 24 to move upward. The socket rod 24 drives the inner stopper 14 to disengage from the inner clamping plate 12. At this time, the steel wire rope is tightened. Continuing to raise the lifting lug 18, the bottom end of the lower steel wire rope 31 is connected to the inner clamping plate 12, driving the inner clamping plate 12 to rotate upward to a state of releasing the blind tube. At this time, continuing to raise the lifting lug 18 can drive the lifting assembly 10 to rise and disengage from the blind tube.

[0032] As Figures 11 to 14 shown, the opposite side surfaces of the inner stopper 14 and the inner clamping plate 12 are both inclined surfaces with the top ends inclined outward. On both sides inside the hanging seat 11, there are receiving grooves 32 for receiving the steel wire rope.

[0033] In this embodiment, during the process of the steel wire rope being tightened, when the inner stopper 14 is lifted, the inclined surface of the inner clamping plate 12 provides an upward thrust to the inner stopper 14, enabling the inner stopper 14 to disengage from the inner clamping plate 12 more smoothly; when the locking hook 17 disengages from the outer stopper 15, the lifting of the lifting lug drives the steel wire rope to be tightened. The receiving groove 32 is an inclined groove with the top facing outward, making the steel wire rope in an obliquely upward state, providing an upward auxiliary force for lifting the inner stopper 14.

[0034] As Figure 10 and Figure 12 shown, on the outer side of the outer clamping plate 13 in the axial direction of the blind tube and on the inner side of the inner clamping plate 12 in the axial direction of the blind tube, there are sliders 33 with an "L" - shaped cross - section. On the hanging seat 11, there are sliding grooves 34 that are slidably matched with the sliders 33.

[0035] In this embodiment, the sliding grooves 34 play a guiding role for the inner clamping plate 12 and the outer clamping plate 13, enabling the inner clamping plate 12 and the outer clamping plate 13 to rotate in the circumferential direction of the blind tube and restricting the maximum distance for the inner clamping plate 12 and the outer clamping plate 13 to rotate downward under the action of gravity.

[0036] As Figures 6 to 10 shown, a tripod 35 is arranged on the outer surface of the outer clamping plate 13. The support wheel 16 is rotatably installed at the vertex of the tripod 35. A limiting block 36 is fixedly arranged on the side of the bottom edge of the tripod 35 facing downward. When the outer clamping plate 13 fixes the blind tube, the distance between the two limiting blocks 36 is adapted to the top dimension of the hanging seat 11, and a gap for receiving the hanging seat 11 is formed between the bottom ends of the two outer clamping plates 13.

[0037] In this embodiment, during transportation, the lifting assembly 10 can be installed on the blind tube in advance. The limiting blocks 36 at the bottom of the tripod 35 and the support wheels can support the blind tube. After the blind tube is installed with the lifting assembly 10, the blind tubes can be placed in a stacked manner. The hanging seat 11 of the lower blind tube can be inserted into the gap at the bottom ends of the two outer clamping plates 13 of the upper blind tube, making the blind tube more stable during transportation.

[0038] The technical scope of the present invention is not limited to the content in the above description. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of the present invention, and these deformations and modifications should all fall within the scope of the present invention.

Claims

1. A construction method for pipe jacking of a deep-buried central drainage ditch in a tunnel, characterized in that, Including: Step 1, invert excavation: The invert excavation is divided into left and right parts. After the excavation is completed, the loose slag, sundries, and accumulated water at the base are cleaned up; Step 2, excavation of the reserved groove: A reserved groove for connecting the middle blind pipe is excavated in the middle of the invert bottom. The direction of the reserved groove is the same as the layout direction of the central water channel; Step 3, installation of the middle connecting blind pipe: The middle connecting blind pipe is placed into the reserved groove with the assistance of a crane and lifting tools. At the same time, after the lateral water pipes on both sides are connected to the middle connecting blind pipe, the reserved groove of the middle connecting blind pipe is backfilled; Step 4, installation of the steel arch frame: When installing the steel arch frame, the invert steel arch frame is connected to the steel arch frames at the arch feet of the left and right side walls, and welded with connecting steel plates to play a role in closing the loop; Step 5, invert pouring operation: First, the invert lining steel bars are tied and welded. After installing the invert formwork, the invert concrete is poured to complete the tunnel invert construction operation; Step 6, jacking construction of the deeply buried central water channel at the tunnel bottom: The jacking construction of the deeply buried central water channel at the tunnel bottom is carried out by using the conventional jacking construction method. After the jacking construction of the deeply buried central water channel is completed, a hole is drilled from the inside to the outside at the center of the pipe top to connect with the middle connecting blind pipe. At the same time, vertical connecting blind pipes are inserted in sections to finally form a drainage system.

2. A sling for connecting a blind pipe, which is applied to the placement operation of the blind pipe connected in the middle of the tunnel deep-buried central drainage ditch pipe jacking construction method described in the above claim 1, and is characterized in that, The lifting tool includes a suspension rod (9) and two lifting components (10) respectively arranged at both ends of the suspension rod (9). The lifting component (10) includes a hanging seat (11) with an open - downwards arc - shaped structure. Both sides of the hanging seat (11) are provided with an inner clamping plate (12) and an outer clamping plate (13) which are distributed inside and outside and extend to the bottom of the blind pipe through the bottom end for supporting the blind pipe. Between the tops of the two outer clamping plates (13) and between the tops of the two inner clamping plates (12), an outer stop block (15) and an inner stop block (14) are respectively arranged. And the outer stop block (15) and the inner stop block (14) are respectively disengaged from the outer clamping plate (13) and the inner clamping plate (12) by upward displacement in the hanging seat (11). The outside of the outer clamping plate (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 clamping plate (13) to rotate upwards and release the blind pipe. The bottom of the outer stop block (15) is provided with a locking hook (17) for lifting the outer stop block (15) to disengage from the top of the outer clamping plate (13). Both ends of the top of the suspension rod (9) are provided with hanging ears (18).

3. The sling for connecting a blind pipe according to claim 2, wherein, A lifting groove (19) is arranged inside the hanging seat (11). The outer stop block (15) is slidably arranged in the lifting groove (19), and when the outer stop block (15) disengages from the top of the outer clamping plate (13), it supports on the inner top wall of the lifting groove (19).

4. The sling for connecting a blind pipe according to claim 2, wherein, A groove (20) is arranged at the bottom of the outer stop block (15). The locking hook (17) is located in the groove (20), and the top of the locking hook (17) supports on the inner top wall of the groove (20). A through - groove (21) for the end of the suspension rod (9) to be inserted downwards into the groove (20) is arranged on the outer stop block (15).

5. The sling for connecting a blind pipe according to claim 4, characterized in that, The lower surface of the locking hook (17) is an inclined surface. The locking hook (17) is telescopically arranged at the end of the hanging rod (9), and a transverse spring (23) for keeping the locking hook (17) in the extended state is arranged in the hanging rod (9). A squeezing block (22) is arranged on the outer clamping plate (13) and is directly below the inclined surface of the locking hook (17) when the outer clamping plate (13) is in the state of a release blind tube. One side surface of the squeezing block (22) facing the locking hook (17) in the telescopic direction of the locking hook (17) is flush with the side wall of the through groove (21). When the hanging rod (9) and the outer stop block (15) are reset downward, the squeezing block (22) squeezes the locking hook (17) into the hanging rod (9) by inserting into the groove (20), and the inner top wall of the groove (20) is supported by the top of the squeezing block (22). A sleeve rod (24) is arranged at the top of the inner stop block (14). A sleeve groove (25) is arranged on the hanging rod (9), and the top end of the sleeve rod (24) is inserted into the sleeve groove (25). When the outer stop block (15) is separated from the outer clamping plate (13), the top end of the sleeve rod (24) supports on the inner bottom wall of the sleeve groove (25).

6. The sling for connecting a blind pipe according to claim 5, characterized in that, A longitudinal spring (26) is arranged in the hanging seat (11). One end of the longitudinal spring (26) is connected to the outer stop block (15) and is used to provide an elastic force for keeping the outer stop block (15) at the lowest position.

7. The sling for connecting a blind pipe according to claim 5, characterized in that, Guide rods (27) are arranged on the upper surface of the inner stop block (14) and are respectively located on both sides of the sleeve rod (24). The sleeve rod (24) is hollow, and a notch (28) is arranged on one side of the sleeve rod (24) facing the guide rod (27). A through hole (29) is arranged at the top end of the sleeve rod (24). An upper steel wire rope (30) whose top end is fixedly connected to the inner top wall of the sleeve groove (25) passes through the through hole (29). Two lower steel wire ropes (31) respectively passing through the notch (28) are connected to the bottom end of the upper steel wire rope (30). The bottom ends of the lower steel wire ropes (31) are connected to the outer side surface of the inner clamping plate (12) after passing through the bottom of the guide rod (27). When the outer stop block (15) is separated from the outer clamping plate (13) upward, the lower steel wire ropes (31) are in a fluffy state.

8. The sling for connecting a blind pipe according to claim 7, characterized in that, One side surface of the inner stop block (14) opposite to the inner clamping plate (12) is an inclined surface with the top end inclined outward. Accommodating grooves (32) for accommodating steel wire ropes are arranged on both sides in the hanging seat (11).

9. The sling for connecting a blind pipe according to claim 2, characterized in that, Sliders (33) with an "L" - shaped cross - section are arranged on the outer side of the outer clamping plate (13) in the axial direction of the blind tube and on the inner side of the inner clamping plate (12) in the axial direction of the blind tube. Sliding grooves (34) for slidingly cooperating with the sliders (33) are arranged on the hanging seat (11).

10. A sling for connecting a blind pipe according to claim 2, characterized in that, A triangular frame (35) is arranged on the outer surface of the outer clamping plate (13). The supporting wheel (16) is rotatably installed at the vertex of the triangular frame (35). A limiting block (36) is fixedly arranged on the side of the bottom edge of the triangular frame (35) facing downward. When the outer clamping plate (13) fixes the blind tube, the distance between the two limiting blocks (36) is adapted to the top dimension of the hanging seat (11), and a gap for accommodating the hanging seat (11) is formed between the bottom ends of the two outer clamping plates (13).

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