A rigid joint connecting device for a pipe curtain and a isolation pile

Abstract

The application discloses a kind of pipe curtain and isolated pile rigid joint connecting device, including isolated pile and rigid node, multiple isolated piles are arranged in the axial direction of tunnel on the both sides of tunnel, steel casing is sleeved in the outside of isolated pile;End rigid node includes steel bar and crown beam concrete, steel bar is embedded in the inside of crown beam concrete to form crown beam;Steel bar includes main reinforcement and fixed reinforcement, the end of pipe curtain is provided with pipe curtain head plate, fixed reinforcement is fixed on pipe curtain head plate, both ends of main reinforcement are connected between two isolated piles along the axial direction of tunnel, fixed reinforcement is fixedly connected with main reinforcement.The application connects isolated pile and pipe curtain into stable structure by the form that steel bar is connected with steel bar, can form rigid node between pipe curtain and isolated pile, improve the anti-floating capacity of tunnel permanent structure, improve the control settlement capacity of tunnel permanent structure simultaneously.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of tunnel construction, in particular to a pipe curtain and isolation pile rigid joint connecting device. BACKGROUND

[0002] With the development of urban rail transit and the continuous use of underground space, engineering activities around existing metro tunnels are becoming more and more frequent. Foundation pit engineering adjacent to metro facilities not only needs to ensure the safety of metro facility structures, but also needs to ensure the safety of normal operation of the metro. There are more and more cases of foundation pits close to operating metro stations and tunnels, and the problem of deformation of operating metro caused by foundation pit excavation has become a hot and difficult problem in engineering.

[0003] For the engineering of metro tunnels affected by foundation pit excavation, if the foundation pit excavation depth is deep and the tunnel top is close to the pit bottom, isolation piles can be set up on both sides of the tunnel when soil reinforcement is not enough to control the uplift deformation of the tunnel and ensure the safety of the tunnel. The top of the isolation pile is connected with the foundation slab or cushion to form a "door frame" or "bench pile" to improve the uplift capacity. The combination of isolation piles and pipe curtains forms advanced support for adjacent metro before large-area foundation pit excavation directly above the metro, which can effectively reduce the disturbance to the existing metro during construction and ensure the safety of the operating metro during construction. However, it is difficult to form a fixed connection between the pipe curtain and the isolation pile.

[0004] Patent application CN108278116B discloses a shallow-buried large-span pipe curtain support system and its construction method. The stability of the steel pipe is improved by setting half-round reinforcing ribs in the inverted "U"-shaped support frame structure steel pipe of the shallow-buried large-span pipe curtain support system, and the adjacent steel pipes are connected together by welding steel plates through the slot on the side wall of the steel pipe, improving its lateral stiffness and bearing capacity. Although the stability of the pipe curtain is improved, the patent cannot be used for the connection between the pipe curtain and the isolation pile, and cannot be used for advanced support of adjacent metro. Therefore, the prior art cannot solve the problem of fixed connection between the pipe curtain and the isolation pile to form a rigid joint. SUMMARY

[0005] In order to overcome the problems existing in the prior art, the purpose of the present application is to provide a pipe curtain and isolation pile rigid joint connecting device, so as to ensure that the isolation pile and the pipe curtain can form a rigid joint, reduce the influence of pipe curtain construction on the original structure and the existing tunnel, and improve the construction efficiency and the safety of the tunnel.

[0006] To achieve the above purpose, the technical solution adopted by the present application is:

[0007] A pipe curtain and isolation pile rigid joint connecting device, comprising: an isolation pile and a rigid joint, a plurality of isolation piles are arranged on both sides of a tunnel in an axial direction of the tunnel, a pipe curtain is horizontally arranged between two rows of isolation piles perpendicular to the axial direction of the tunnel, the height of the pipe curtain is higher than the top surface of the tunnel, and the pipe curtain is connected with the isolation pile through the rigid joint;

[0008] The rigid joint comprises an end rigid joint and a steel casing;

[0009] The steel casing is sleeved on the outside of the isolation pile; the end rigid joint comprises steel bars and crown beam concrete, the steel bars are embedded in the inside of the crown beam concrete to form a crown beam; the steel bars comprise main bars and fixing bars, an end of the pipe curtain is provided with a pipe curtain end plate, the fixing bars are fixed on the pipe curtain end plate, and both ends of the main bars are connected between two isolation piles in the axial direction of the tunnel; and the fixing bars are fixedly connected with the main bars.

[0010] Optionally, the axial directions of a plurality of tunnels are the same, and the pipe curtains in the same axial direction between the tunnels are connected into one body;

[0011] The rigid joint further comprises a middle rigid joint, the middle rigid joint is connected on two rows of isolation piles between adjacent two tunnels; the middle rigid joint comprises a steel plate and a concrete plate, the concrete plate is wrapped on the outside of the steel plate, one end of the steel plate is connected on the side of the pipe curtain, and the other end is connected with the steel casing outside the isolation piles between the adjacent two tunnels.

[0012] Optionally, the concrete plate is arranged on the inside of the pile body center of the two rows of isolation piles between the adjacent two tunnels, the pipe curtain, the steel plate and the isolation piles are fixedly connected with the concrete plate, and the thickness of the concrete plate is greater than the outer diameter of the pipe curtain.

[0013] Optionally, the steel plate comprises a pipe curtain steel plate and a connecting steel plate, the pipe curtain steel plate is fixed on the side of the pipe curtain, one end of the connecting steel plate is connected with the pipe curtain steel plate, and the other end is connected with the steel casing.

[0014] Optionally, the pipe curtain steel plate is double-face welded along the axial direction of the arc top of the side of the pipe curtain.

[0015] Optionally, the axial direction of the pipe curtain steel plate is the same as the axial direction of the pipe curtain, and the included angle between the connecting steel plate and the pipe curtain steel plate is 30°-35° or 40°-45°.

[0016] Optionally, the fixing bars are U-shaped bars, and both ends of the fixing bars are fixed on the pipe curtain end plate.

[0017] Optionally, the steel bars further comprise stirrups, and the stirrups are arranged on the outside of the main bars.

[0018] Optionally, the number of the fixing ribs is more than one and the fixing ribs are evenly arranged on the pipe roof end plate, and the fixing ribs are horizontally arranged and perpendicular to the main rib.

[0019] Optionally, the main rib and the steel casing are connected through the adapter, and the connection strength is I-class joint requirement.

[0020] Compared with the prior art, the present application has the following beneficial effects:

[0021] The present application can improve the anti-floating capacity of the tunnel permanent structure, and improve the control settlement capacity of the tunnel permanent structure.

[0022] Further, the present application provides a pipe roof steel plate arranged on the side of the pipe roof, and the pipe roof steel plate and the steel casing are connected through the connecting steel plate to form a stable steel structure and pour concrete to form a middle rigid joint, so that the whole structure of the isolation pile and the pipe roof on both sides of the tunnel and the uplink and downlink is formed, and the pipe roof and the isolation pile between adjacent tunnels form a stable rigid joint.

[0023] Further, the thickness of the concrete plate of the present application is greater than the outer diameter of the pipe roof, which can form a fixed connection with the pipe roof, the steel plate and the isolation pile, and improve the stability of the middle rigid joint.

[0024] Further, the angle between the connecting steel plate and the pipe roof steel plate of the present application is 30° to 35° or 40° to 45°, which improves the bearing capacity of the concrete plate, thereby improving the overall stability of the middle rigid joint connection.

[0025] Further, the fixing rib of the present application is a U-shaped rib, which can enhance the stability of the connection with the main rib and improve the stability of the end rigid joint. BRIEF DESCRIPTION OF DRAWINGS

[0026] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present application in any way. In addition, the shapes and proportions of the components in the drawings are only illustrative and are used to help understand the present application, and are not specific limitations on the shapes and proportions of the components. In the drawings:

[0027] Figure 1 is a side view of the present application;

[0028] Figure 2 is a top view of the middle rigid joint of the present application;

[0029] Figure 3 partial front view of the pipe-roof end head plate of the present application;

[0030] Figure 4 partial plan view of the pipe-roof end head plate of the present application;

[0031] Figure 5 front view of the end rigid joint of the present application;

[0032] Figure 6 side view of the end rigid joint of the present application;

[0033] Figure 7 plan view of the middle rigid joint of the present application.

[0034] Wherein, 1-isolation pile, 11-steel casing, 2-pipe-roof, 21-pipe-roof end head plate, 3-end rigid joint, 31-steel bar, 311-main bar, 312-stirrup, 313-fixing bar, 32-crown beam, 4-middle rigid joint, 41-steel plate, 411-pipe-roof steel plate, 412-connecting steel plate, 42-concrete plate, 5-tunnel. DETAILED DESCRIPTION

[0035] In order to make the personnel in the technical field better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person of ordinary skill in the art without creative labor should belong to the protection scope of the present application.

[0036] It should be noted that when an element is referred to as being “provided on” another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being “connected” to another element, it can be directly connected to the other element or there can be an intervening element. The terms “vertical”, “horizontal”, “left”, “right”, and similar expressions used herein are used for illustrative purposes only and are not intended to be the only embodiment.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items.

[0038] The present application will be described in detail below in combination with the drawings.

[0039] like Figure 1 As shown, a rigid joint connection device for pipe curtain and isolation piles according to the present invention includes isolation piles 1, pipe curtain 2, and rigid nodes. In this embodiment, there are two tunnels 5, wherein the pipe curtain 2 is arranged between two rows of isolation piles 1 perpendicular to the axial direction of the tunnel 5, and the pipe curtain 2 is set above the tunnel 5 to prevent the overall structure from floating. Two rows of isolation piles 1 are arranged on both sides of the outer side of each tunnel 5 along the axial direction of the tunnel 5. The rigid node includes a steel casing 11, an end rigid node 3, and a middle rigid node 4; the steel casing 11 is sleeved on the outside of the isolation pile 1 and is fixedly connected to the isolation pile 1 by the concrete of the isolation pile itself; the end rigid node 3 is arranged on the outer side of the two non-adjacent tunnels 5, and the middle rigid node 4 is arranged between the two tunnels 5.

[0040] like Figures 2 to 6 As shown, the end of the pipe curtain 2 is provided with a pipe curtain end plate 21. The end rigid node 3 includes reinforcing bars 31 and capping beam concrete 32, which is poured outside the reinforcing bars 31 to form a capping beam. The reinforcing bars 31 include main bars 311, stirrups 312, and fixing bars 313. The main bars 311 are multiple bars arranged in parallel at the same height. The stirrups 312 are located outside the main bars 311.

[0041] One end of the main reinforcement bar 311 is welded to the steel casing 11, and the other end is welded to the steel casing 11 of another isolation pile 1. The fixing reinforcement bar 313 is a U-shaped bar, and both ends of the fixing reinforcement bar 313 are fixed to the end plate 21 of the pipe curtain. The fixing reinforcement bar 313 is fixedly connected to the main reinforcement bar 311, and the fixing reinforcement bar 313 and the main reinforcement bar 311 are perpendicular to each other. Then, concrete is poured on the outside of the main reinforcement bar 311, the stirrups 312 and the fixing reinforcement bar 313 to form the cap beam concrete 32. Figure 2 As shown, the cap beam concrete 32 is perpendicular to the pipe curtain 2.

[0042] like Figure 5 As shown, the steel casing 11 is welded with multiple layers of main ribs 311, and each layer of main ribs 311 is fixedly connected with a fixing rib 313.

[0043] Optional, such as Figures 3 to 4 As shown, the tube curtain end plate 21 is circular. A fixing rib 313 is provided at the top and bottom center of the tube curtain end plate 21. Three layers of fixing ribs 313 are equally spaced in the middle of the tube curtain end plate 21. There are two fixing ribs 313 in each layer. The two fixing ribs 313 in each layer are symmetrically arranged on both sides of the vertical central axis of the tube curtain end plate 21.

[0044] like Figure 7As shown, the middle rigid node 4 comprises a steel plate 41 and a concrete plate 42. The side of the pipe curtain 2 is connected to the steel casing 11 outside the isolation pile 1 through the steel plate 41. The steel plate 41 comprises a pipe curtain steel plate 411 and a connecting steel plate 412, the pipe curtain steel plate 411 is fixed on the side of the pipe curtain 2, the pipe curtain steel plate 411 is double-sided welded along the axial direction of the arc top of the side of the pipe curtain 2, one end of the connecting steel plate 412 is connected to the pipe curtain steel plate 411, and the other end is connected to the steel casing 11. The outside of the pipe curtain 2 is poured with concrete to form the concrete plate 42. The axial direction of the pipe curtain steel plate 411 is the same as the axial direction of the pipe curtain 2, and the included angle between the connecting steel plate 412 and the pipe curtain steel plate 411 is 30° to 35° or 40° to 45°.

[0045] As an optional implementation of the embodiment, the pipe curtain 2 adopts a steel pipe curtain, and is constructed by using a launching well and a receiving well to push the pipe curtain.

[0046] As an optional implementation of the embodiment, the fixed rib 313 is connected to the pipe curtain end plate 21 by plug welding.

[0047] As a preferred implementation of the embodiment, the main rib 311 is connected to the steel casing 11 by using a connector, and the connection strength is required to be I-class joint.

[0048] As a preferred implementation of the embodiment, the inner diameter of the pipe curtain 2 is not less than 0.8 m, the wall thickness is not less than 16 mm, and the concrete strength grade of the pipe curtain 2 filled with concrete is not less than C30.

[0049] As a preferred implementation of the embodiment, the cross-sectional dimension of the corbel concrete 32 is not less than 800 mm.

[0050] As a preferred implementation of the embodiment, the concrete strength grade of the concrete plate 42 is not less than C30, and the plate thickness is not less than 500 mm.

[0051] As a preferred implementation of the embodiment, the pipe curtain steel plate 411 is double-sided welded along the axial direction of the arc top of the side of the pipe curtain 2, and the weld length is not less than 5 times the diameter of the steel bar; the weld height of the steel casing welded is not less than 8 mm.

[0052] As a preferred implementation of the embodiment, the thickness of the steel plate 41 is not less than 20 mm, the steel plate 41 is welded directly above the steel casing 11 and the pipe curtain 2 to form a continuous steel plate 2, and the weld height of the steel plate 2 welded is not less than 10 mm.

[0053] The pipe curtain and isolation pile rigid joint connecting device of the application, when constructing, the isolation pile 1 adopts dry hole mode to drill holes and embeds the steel casing 11. The pipe curtain 2 is jacked up by using the starting well and receiving well jacking construction method. Then the pipe curtain 2 is sealed by using the pipe curtain end plate 21, and the pipe curtain end plate 21 is plug welded by using the fixing rib 313.

[0054] After the reinforcement cage is lowered under the isolation pile 1, the steel casing 11 is pre-buried, the pipe curtain 2 is jacked up, the concrete protective layer of the reserved position of the isolation pile 1 is removed, the main rib 311 is welded with the steel casing 11 through the adapter, and the hoop rib 312 is integrally connected with the fixing rib 313 pre-buried in the pipe curtain end plate 21. The concrete is integrally poured to form the corbel concrete 32.

[0055] The pipe curtain steel plate 411 is welded in the middle of the side of the pipe curtain 2, the connecting steel plate 412 is welded on the pipe curtain steel plate 411, the other end of the connecting steel plate 412 is welded on the steel casing 11, and finally the part between the two rows of isolation piles 1 is integrally poured to form the concrete plate 42.

[0056] In the above embodiments, the device elements are conventional device elements unless otherwise specified, and the structure setting mode, working mode or control mode are conventional setting mode, working mode or control mode in the art unless otherwise specified.

[0057] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the application and not to limit the application, and other modifications or equivalent replacements of the technical solutions of the application made by those skilled in the art should be covered in the scope of the claims of the application as long as they do not deviate from the spirit and scope of the technical solutions of the application.

Claims

1. A rigid joint connection device for pipe curtain and isolation pile, characterized in that, include: Isolation piles (1) and rigid joints: Multiple isolation piles (1) are arranged on both sides of the tunnel (5) along the axial direction of the tunnel (5). A pipe curtain (2) is horizontally arranged between the two rows of isolation piles (1) perpendicular to the axial direction of the tunnel (5). The height of the pipe curtain (2) is higher than the top surface of the tunnel (5). The pipe curtain (2) is connected to the isolation piles (1) through rigid joints. The rigid node includes an end rigid node (3) and a steel casing (11); The steel casing (11) is fitted on the outside of the isolation pile (1); the end rigid node (3) includes a steel bar (31) and a cap beam concrete (32), the steel bar (31) is embedded in the inner side of the cap beam concrete (32) to form a cap beam; the steel bar (31) includes a main bar (311) and a fixing bar (313), the end of the pipe curtain (2) is provided with a pipe curtain end plate (21), the fixing bar (313) is fixed on the pipe curtain end plate (21), the two ends of the main bar (311) are connected between two isolation piles (1) along the axial direction of the tunnel (5), and the fixing bar (313) is fixedly connected to the main bar (311); The axial directions of the multiple tunnels (5) are the same, and the pipe curtains (2) in the same axial direction of the multiple tunnels (5) are connected to each other as a whole; The rigid node also includes a central rigid node (4), which is connected to two rows of isolation piles (1) between two adjacent tunnels (5); the central rigid node (4) includes a steel plate (41) and a concrete plate (42), the concrete plate (42) is wrapped around the outside of the steel plate (41), one end of the steel plate (41) is connected to the side of the pipe curtain (2), and the other end is connected to the steel casing (11) outside the isolation piles (1) between two adjacent tunnels (5); The fixing rib (313) is a U-shaped rib, and the two ends of the fixing rib (313) are fixed to the end plate (21) of the pipe curtain.

2. The rigid joint connection device for pipe curtain and isolation pile according to claim 1, characterized in that, The concrete slab (42) is set inside the center of the pile body of the two rows of isolation piles (1) between two adjacent tunnels (5). The pipe curtain (2), steel plate (41) and isolation piles (1) are all fixedly connected to the concrete slab (42). The thickness of the concrete slab (42) is greater than the outer diameter of the pipe curtain (2).

3. The rigid joint connection device for pipe curtain and isolation pile according to claim 1, characterized in that, The steel plate (41) includes a pipe curtain steel plate (411) and a connecting steel plate (412). The pipe curtain steel plate (411) is fixed on the side of the pipe curtain (2). One end of the connecting steel plate (412) is connected to the pipe curtain steel plate (411), and the other end is connected to the steel casing (11).

4. The rigid joint connection device for pipe curtain and isolation pile according to claim 3, characterized in that, The steel plate (411) of the tube curtain is welded on both sides along the arc top axis of the side of the tube curtain (2).

5. A rigid joint connection device for pipe curtain and isolation pile according to claim 3, characterized in that, The axial direction of the tube curtain steel plate (411) is the same as that of the tube curtain (2), and the included angle between the connecting steel plate (412) and the tube curtain steel plate (411) is 30° to 35° or 40° to 45°.

6. The rigid joint connection device for pipe curtain and isolation pile according to claim 1, characterized in that, The reinforcing bar (31) also includes stirrups (312), which are arranged outside the main reinforcing bar (311).

7. The rigid joint connection device for pipe curtain and isolation pile according to claim 1, characterized in that, The number of fixing ribs (313) is greater than one and they are evenly arranged on the end plate (21) of the pipe curtain. The fixing ribs (313) are arranged horizontally and perpendicular to the main ribs (311).

8. The rigid joint connection device for pipe curtain and isolation pile according to claim 1, characterized in that, The main reinforcement (311) and the steel casing (11) are connected by a connector, and the connection strength is required to meet the Class I joint requirements.

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