Long distance crossing tunnel duct structure

Abstract

The utility model discloses a long distance crossing tunnel pipe curtain structure. For long distance crossing, generally adopt increasing work vertical well in the middle part of crossing section, realize in the inside lengthening of vertical well. The utility model discloses a horizontal lock catch pipe curtain and oblique lock catch pipe curtain, and horizontal pipe curtain and oblique pipe curtain are located both ends of tunnel, and horizontal pipe curtain includes a plurality of horizontal pipe curtain steel pipes, and horizontal steel pipe is along the longitudinal direction of tunnel and is horizontally arranged, and is connected through interlocking structure between horizontal steel pipe, and the clearance between the inside of horizontal pipe curtain steel pipe and adjacent horizontal pipe curtain steel pipe is filled with concrete, and oblique pipe curtain includes a plurality of oblique pipe curtain steel pipes, and oblique pipe curtain steel pipe is along the longitudinal direction of tunnel and is obliquely arranged, and is connected through interlocking structure between oblique pipe curtain steel pipe, and the clearance between the inside of oblique pipe curtain steel pipe and adjacent oblique pipe curtain steel pipe is filled with concrete, and horizontal pipe curtain steel pipe and oblique pipe curtain steel pipe are overlapped at one end in the inside of tunnel. The utility model reduces the length of pipe curtain, improves construction efficiency, and does not need construction vertical well.

Description

Technical Field

[0001] This utility model belongs to the field of pipe jacking construction technology, specifically relating to a pipe jacking structure for long-distance tunnel crossings. Background Technology

[0002] The pipe jacking method is a trenchless construction technique used for underground space development. It involves pre-inserting a series of closely spaced steel or concrete pipes around a predetermined area to form a temporary or permanent support structure. Internal soil excavation and structural construction are then carried out under the protection of this "pipe jacking." This method effectively controls ground settlement and protects the surrounding environment, making it particularly suitable for shallow-buried, large-span underground projects in urban areas.

[0003] For long-distance crossings, a common approach is to add a working shaft in the middle of the crossing section and extend the tunnel within the shaft. However, this method involves jacking from one side, and the longer the tunnel jacking is, the greater the resistance during construction, reducing construction efficiency. Furthermore, this method, due to the construction shaft, has a significant impact on ground structures, especially on high-grade roads, causing traffic disruptions and affecting driving. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, this utility model provides a long-distance tunnel tunnel pipe curtain structure. The pipe curtain is simultaneously pushed in from both ends of the tunnel and overlaps inside the tunnel, reducing the length of the pipe curtain, improving construction efficiency, and eliminating the need for construction shafts.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A long-distance tunnel tunnel pipe jacking structure, specifically:

[0007] It includes a horizontally locked pipe curtain and an inclined locked pipe curtain, which are located at both ends of the tunnel, respectively;

[0008] The horizontal interlocking pipe curtain includes multiple horizontal pipe curtain steel pipes, which are horizontally arranged along the longitudinal direction of the tunnel and connected by an interlocking structure; the interior of the horizontal pipe curtain steel pipes and the gaps between adjacent horizontal pipe curtain steel pipes are filled with concrete.

[0009] The inclined interlocking pipe curtain includes multiple inclined pipe curtain steel pipes, which are inclined along the longitudinal direction of the tunnel; the inclined pipe curtain steel pipes are connected by an interlocking structure; the interior of the inclined pipe curtain steel pipes and the gaps between adjacent inclined pipe curtain steel pipes are filled with concrete.

[0010] The horizontal and inclined pipe curtain steel pipes overlap at one end inside the tunnel.

[0011] Furthermore, the horizontal locking pipe curtain is installed on the low mileage side of the tunnel.

[0012] Furthermore, the inclined locking pipe curtain is installed on the high-mileage side of the tunnel.

[0013] Furthermore, the angle between the inclined tube curtain steel pipe and the horizontal direction is 0.4-0.9°.

[0014] Furthermore, grouting conduits are provided around the horizontal and inclined pipe curtain steel pipes.

[0015] Furthermore, the interlocking structure includes four angle steels, which are fixedly connected to the outer wall of the inclined or horizontal pipe curtain steel pipe.

[0016] Furthermore, the inclined pipe curtain steel pipe is set outside the horizontal pipe curtain steel pipe.

[0017] The beneficial effects of this utility model are:

[0018] 1) This utility model adopts a two-way driving and docking method. At one end, horizontal jacking is used, and at the other end, a small angle jacking is added on the horizontal basis, so that the steel pipes of the pipe curtain at both ends overlap at a specific position, which reduces the length of the pipe curtain, improves construction efficiency, and eliminates the need for construction shafts, avoiding the impact on existing traffic, and completing the long-distance construction of the pipe curtain.

[0019] 2) The steel pipe of this utility model is short in length, has low resistance, reduces the requirements on machinery, and reduces the error of the pipe curtain head;

[0020] 3) This utility model is applicable to advance support for tunnel projects with shallow overburden and those passing through major or important buildings and structures. Attached Figure Description

[0021] Figure 1 This is a side view of the present invention.

[0022] Figure 2 This is a schematic diagram of the overlapping of steel pipes in the pipe curtain structure of this utility model;

[0023] Figure 3 This is a schematic diagram of the connection of the steel pipe in the pipe curtain of this utility model;

[0024] Figure 4 This is a cross-sectional view of the tunnel structure of this utility model. Detailed Implementation

[0025] The present invention will now be described in detail with reference to specific embodiments.

[0026] This utility model adopts a two-way driving and docking method, using horizontal jacking at one end and additional small-angle jacking at the other end on the horizontal basis, so that the steel pipes of the pipe curtain at both ends overlap at a specific position, reducing the length of the pipe curtain, improving construction efficiency, and eliminating the need for construction shafts, thus avoiding disruption to existing traffic and completing long-distance pipe curtain construction.

[0027] like Figure 1 , 2 As shown, this utility model provides a long-distance tunnel pipe curtain structure, including a horizontal locking pipe curtain and an inclined locking pipe curtain, which are located at both ends of the tunnel respectively. Considering the geological conditions, since inclined jacking may cross strata, an arrangement method that can minimize the requirements for jacking is selected. The horizontal locking pipe curtain is set on the side with a lower mileage of the tunnel, and the inclined locking pipe curtain is set on the side with a higher mileage of the tunnel.

[0028] The horizontal interlocking pipe jacking system comprises multiple horizontal pipe jacks, which are horizontally arranged along the longitudinal direction of the tunnel and connected by an interlocking structure. The interior of each horizontal pipe jack and the gaps between adjacent horizontal pipe jacks are filled with concrete. The inclined interlocking pipe jacking system comprises multiple inclined pipe jacks, which are inclined along the longitudinal direction of the tunnel and connected by an interlocking structure. The interior of each inclined pipe jack and the gaps between adjacent inclined pipe jacks are filled with concrete. The angle between the inclined pipe jacks and the horizontal direction is 0.4-0.9°.

[0029] The overburden layer on the high-mileage side is relatively thin. If the pipe jacking is carried out horizontally directly on the high-mileage side, the top pipe jacking will be exposed directly to the ground surface, making construction impossible. The pipe jacking should be started according to the design cross-section. Once it reaches a certain depth, the pipe jacking will enter the roadbed area, and there will be no situation where it is exposed to the ground surface. If the high-mileage side is also jacked horizontally, the soil layer inside the pipe jacking will collapse during the excavation stage. Horizontal jacking will cause more soil excavation, which will lead to the need for more concrete lining and increase costs. Therefore, the pipe jacking in this application adopts a method of horizontal at one end and inclined at the other end, which can be applied to shallow burial and underpass highway situations.

[0030] The horizontal and inclined tubular steel pipes overlap at one end inside the tunnel, with the inclined pipes positioned outside the horizontal pipes. The overlap location should ideally be chosen where external pressure or load is low. In this embodiment, the horizontal and inclined pipes are made of 402mm diameter steel pipes with a wall thickness of 10mm, and the spacing between adjacent pipes is 46-48cm. The overlap length along the tunnel's longitudinal direction is 500cm.

[0031] like Figure 3As shown, the interlocking structure includes four angle steels, which are fixedly connected to the outer wall of the inclined or horizontal pipe curtain steel pipe. The edges of the angle steels on the pipe curtain steel pipe are inserted into the angle steels on the adjacent pipe curtain steel pipes, and the connection is achieved through interlocking. The direction and position of the angle steels are set according to the actual working conditions to ensure reliable connection.

[0032] Grouting guide pipes are installed around the horizontal and inclined pipe curtain steel pipes. In this embodiment, the grouting guide pipes are made of seamless steel pipes with a diameter of 42mm and a wall thickness of 4mm.

[0033] The construction method of this utility model is as follows:

[0034] At both ends of the tunnel, a pipe curtain jacking drilling rig and its frame are installed on the working face. The frame can move left and right and up and down by electric hoists on the transverse rails and columns so that the jacking drilling rig can cover the designed hole position of each pipe curtain steel pipe.

[0035] At both ends of the tunnel, pipe jacking drilling rigs are used to simultaneously construct the pipe jacking steel pipes along the tunnel's designed angle or trajectory to the predetermined position and overlap them. During the construction of the pipe jacking steel pipes, the steel pipe of the spiral drill bit with soil cutting (rock breaking) drill bit installed at the end is used as the outer casing. The pipe jacking drilling rig provides forward thrust to the steel pipe with a solid backing and provides rotational power to the spiral drill rod and drill bit through its own motor. During the jacking process, the pipe jacking steel pipes are jacked, cut, slag removed, and welded together, advancing the pipe jacking steel pipes section by section to the designed position.

[0036] like Figure 4 As shown, adjacent steel pipes are interlocked by locking or tenon and mortise structures. The longitudinal arrangement and transverse interlocking of multiple steel pipes form a pipe curtain. Concrete is then poured through grouting pipes to fill and solidify the gaps between the inner and outer parts of the pipe curtain steel pipes and the interlocking structure, forming a continuous and integral pipe curtain support structure that provides safety protection for the tunnel excavation space by isolating, water-stopping and supporting it.

[0037] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "join," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] The content of this utility model is not limited to the embodiments listed. Any equivalent modifications made by those skilled in the art to the technical solution of this utility model after reading this utility model specification shall be covered by the claims of this utility model.

Claims

1. A long-distance tunnel tunnel pipe curtain structure, characterized in that: It includes a horizontally locked pipe curtain and an inclined locked pipe curtain, which are located at both ends of the tunnel, respectively; The horizontal interlocking pipe curtain includes multiple horizontal pipe curtain steel pipes, which are horizontally arranged along the longitudinal direction of the tunnel and connected by an interlocking structure; the interior of the horizontal pipe curtain steel pipes and the gaps between adjacent horizontal pipe curtain steel pipes are filled with concrete. The inclined interlocking pipe curtain includes multiple inclined pipe curtain steel pipes, which are inclined along the longitudinal direction of the tunnel; the inclined pipe curtain steel pipes are connected by an interlocking structure; the interior of the inclined pipe curtain steel pipes and the gaps between adjacent inclined pipe curtain steel pipes are filled with concrete. The horizontal and inclined pipe curtain steel pipes overlap at one end inside the tunnel.

2. The long-distance tunnel pipe curtain structure according to claim 1, characterized in that: The horizontal locking pipe curtain is installed on the low mileage side of the tunnel.

3. The long-distance tunnel pipe curtain structure according to claim 2, characterized in that: The inclined locking pipe curtain is installed on the high-mileage side of the tunnel.

4. A long-distance tunnel tunnel pipe curtain structure according to claim 3, characterized in that: The angle between the inclined tube curtain steel pipe and the horizontal direction is 0.4-0.9°.

5. A long-distance tunnel tunnel pipe curtain structure according to claim 4, characterized in that: Grouting conduits are installed around the horizontal and inclined pipe curtain steel pipes.

6. A long-distance tunnel tunnel pipe curtain structure according to claim 5, characterized in that: The interlocking structure includes four angle steels, which are fixedly connected to the outer wall of the inclined or horizontal pipe curtain steel pipe.

7. A long-distance tunnel tunnel pipe curtain structure according to claim 6, characterized in that: The inclined pipe curtain steel pipe is set outside the horizontal pipe curtain steel pipe.

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