Settlement control structure in tunnel hole

Abstract

A settlement control structure in a tunnel hole comprises a tunnel main hole primary supporting type steel arch frame, a plurality of sets of connecting steel plates are symmetrically arranged on the two sides of the arch foot position of the tunnel main hole primary supporting type steel arch frame, the connecting steel plates are arranged between every two adjacent steel arch frames on the same side, anchor pipe holes are machined in the connecting steel plates, and feet-lock anchor pipes penetrate through the anchor pipe holes to be driven into surrounding rock. A plain concrete temporary inverted arch is constructed at the arch camber line position of the main tunnel to seal the primary support structure of the main tunnel into a ring in advance; the plain concrete temporary inverted arch is adopted to seal the main tunnel primary support structure into a ring in advance, the connecting steel plate trepanning structure is adopted to connect the feet-lock anchor pipe and the main tunnel primary support steel arch frame to form a stress whole, and the structure has the advantages of being convenient to construct, mount and dismount, simple in construction operation, small in influence on the main tunnel structure and high in construction efficiency. The method has the advantages of being capable of rapidly controlling settlement deformation in the hole and the like, and is especially suitable for emergently controlling settlement in construction.

Description

Technical Field

[0001] The utility model belongs to the technical field of tunnel engineering construction, and in particular relates to a settlement control structure in a tunnel. Background Art

[0002] At present, tunnel construction is faced with a variety of construction problems, among which the settlement and deformation in the tunnel has become the main factor threatening the safety of workers and affecting the stability of the support structure. In severe cases, it will cause landslides in the tunnel and the intrusion of the primary support structure. At present, the early stage of the tunnel mainly uses structures such as locking anchor pipes and temporary inverts to control settlement. The traditional method mostly uses connecting steel bars to weld the locking anchor pipes with the main tunnel steel arch frame to form a force-bearing whole, which jointly bears and suppresses deformation. However, the installation angle of the locking anchor pipe requires high precision. If there is a slight deviation, the welding quality of the locking anchor pipe and the connecting steel bar will be greatly reduced; the traditional method of temporary inverts mostly uses steel cross braces and the main tunnel steel arch frame to weld to form a force-bearing whole, and close the main tunnel primary support structure into a ring in advance, which has a significant effect on controlling settlement, but its installation and disassembly are more troublesome, and the construction takes a long time. The steel cross braces will pull the main tunnel steel arch frame under the repeated rolling of large-scale operating machinery, which is easy to cause the cracking of the tunnel primary support. Summary of the invention

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the above-mentioned prior art and provide a tunnel settlement control structure which is convenient to install and disassemble, has simple construction operations, has little impact on the main tunnel structure, and can quickly control the settlement deformation in the tunnel.

[0004] The technical solution adopted to solve the above technical problems is: a settlement control structure in the tunnel, including a primary supporting steel arch frame of the tunnel main tunnel, and a plurality of groups of connecting steel plates are symmetrically arranged on both sides of the arch foot position of the primary supporting steel arch frame of the tunnel main tunnel, and the connecting steel plates are arranged between two adjacent steel arch frames on the same side, and anchor pipe holes are processed on the connecting steel plates. The locking foot anchor pipes pass through the anchor pipe holes and are driven into the surrounding rock. A temporary invert is constructed at the arch line position of the tunnel main tunnel to close the primary supporting structure of the main tunnel into a ring in advance.

[0005] The connecting steel plate of the utility model is processed with 1 to 3 anchor pipe holes.

[0006] The utility model comprises an anchor pipe body, which is a hollow structure and has a conical end. The anchor pipe body is processed with a plurality of circles of grouting holes, and two adjacent circles of grouting holes are staggered. The outer side wall of the anchor pipe body is provided with a plurality of circles of barbs, and two adjacent circles of barbs are staggered.

[0007] The included angle between the barb and the center line of the anchor pipe body of the utility model is 30° to 45°.

[0008] The barbs of the utility model are of triangular structure.

[0009] The locking foot anchor pipe of the utility model is driven into the surrounding rock in a downward slanting manner, and the angle α between the locking foot anchor pipe and the horizontal plane is 30° to 45°.

[0010] The temporary inverted arch of the utility model adopts segmented partitions as templates for segmented casting, with a thickness of 40 to 50 cm.

[0011] Compared with the prior art, the utility model has the following advantages:

[0012] 1. The tunnel settlement control structure of the utility model is convenient to construct, install and disassemble, has simple construction operations, has little impact on the tunnel structure, can quickly control the settlement deformation in the tunnel, and is particularly suitable for situations where emergency settlement control is required during construction.

[0013] 2. The utility model adopts a connecting steel plate opening structure to connect the locking foot anchor pipe with the primary support steel arch frame of the main hole to form a force-bearing whole. The connecting steel plate opening structure can be processed in advance, and the installation is simple and convenient; the anchor pipe hole can realize the precise positioning of the installation position of the locking foot anchor pipe, and the installation angle can be adjusted arbitrarily according to the needs of the site. Grouting holes and barbs are left on the outer wall of the locking foot anchor pipe, which is convenient for the subsequent grouting slurry to spread to the outside of the anchor pipe to reinforce the surrounding rock and enhance the friction contact ability between the anchor pipe and the surrounding rock.

[0014] 3. The utility model adopts high-grade plain concrete as a temporary invert, which has a similar effect to that of a temporary cross brace, and closes the primary support structure of the main tunnel into a ring in advance; it can be directly poured after simply leveling the site, without the need for welding construction, and can be set up in sections, making it simple and convenient to dismantle later; by adding an appropriate amount of early strength agent, the plain concrete can quickly reach the designed strength and form a dense beam-slab structure, which has a better effect on early settlement control in the tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model.

[0016] Figure 2 It is a structural plane schematic diagram of an embodiment of the utility model.

[0017] Figure 3 yes Figure 1 A large-scale drawing of the connecting steel plate 3.

[0018] Figure 4 yes Figure 3 BB cross-sectional view.

[0019] Figure 5 yes Figure 3 Schematic diagram of the structure of the middle locking foot anchor pipe 4.

[0020] In the figure: 1. Initial support steel arch frame of the tunnel main hole; 2. Temporary invert arch; 3. Connecting steel plate; 4. Locking anchor pipe; 5. Segmented partition; 4-1. Anchor pipe body; 4-2. Grouting hole; 4-3. Barb. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited to these embodiments.

[0022] Example 1

[0023] exist Figures 1 to 5 In the present invention, the settlement control structure in the tunnel comprises a tunnel main tunnel primary support steel arch frame 1, and a plurality of groups of connecting steel plates 3 are symmetrically arranged on both sides of the arch foot position of the tunnel main tunnel primary support steel arch frame 1. The connecting steel plates 3 can be fixed to the arch foot position of the tunnel main tunnel steel arch frame 1 by welding or threaded fastening connectors. Specifically, each group of connecting steel plates 3 is installed between two adjacent steel arch frames on the same side, and anchor pipe holes are processed on the connecting steel plates 3. The number of anchor pipe holes is determined according to the distance between adjacent steel arch frames. The anchor pipe holes on the connecting steel plates 3 between adjacent steel arch frames are symmetrically arranged. In this embodiment, 1 to 3 anchor pipe holes are taken.

[0024] The locking foot anchor pipe 4 passes through the anchor pipe hole and is driven into the surrounding rock at an angle downward. The anchor pipe hole guides the drilling position of the locking foot anchor pipe 4, thereby realizing the accurate positioning of the installation position of the locking foot anchor pipe 4. Grouting is performed in the locking foot anchor pipe 4, and the locking foot anchor pipe 4 is welded in pairs with the tunnel main hole steel arch frame 1 to form a force-bearing whole. The installation angle of the locking foot anchor pipe 4 can be adjusted according to the on-site angle, but the grouting reinforcement effect is best when the angle α between the locking foot anchor pipe 4 and the horizontal plane is 30°~45°. The locking foot anchor pipe 4 adopts a hot-rolled seamless steel pipe and one end is a tapered structure. Its diameter can be adjusted according to the needs of different projects. If necessary, a large steel pipe with a diameter of 108mm can be used. Specifically, the locking foot anchor pipe 4 includes an anchor pipe body 4-1, an anchor pipe A plurality of circles of grouting holes 4-2 are processed on the main body 4-1, and two adjacent circles of grouting holes 4-2 are arranged in a staggered manner. A plurality of circles of barbs 4-3 are arranged on the outer wall of the anchor pipe main body 4-1, and two adjacent circles of barbs 4-3 are arranged in a staggered manner. The grouting holes 4-2 facilitate the subsequent grouting slurry to diffuse to the outside of the anchor pipe to reinforce the surrounding rock, and the barbs 4-3 enhance the friction contact ability between the anchor pipe and the surrounding rock. The diameter of the grouting holes 4-2 is adjusted according to the needs of different projects. The barbs 4-3 are triangular structures and the angle between them and the center line of the anchor pipe main body 4-1 is 30° to 45°. The angle direction of the barbs 4-3 is consistent with the direction in which the locking foot anchor pipe 4 is driven into the surrounding rock, ensuring that the barbs 4-3 will not bend during the driving process of the locking foot anchor pipe 4.

[0025] A temporary invert 2 is constructed at the arch line position of the tunnel main tunnel. Before pouring, the site is simply leveled and high-grade plain concrete is used for pouring. By adding a proper amount of early strength agent, the plain concrete can quickly reach the design strength to form a dense beam-slab structure, ensuring that the initial support structure is quickly closed into a ring. In this embodiment, the temporary invert 2 uses the segmented partition 5 as a template for segmented pouring, which is simple and convenient to dismantle later. The casting material of the temporary invert 2 can be C40 and above grade concrete, and the effective thickness is controlled at 40-50 cm, which can be adjusted according to the needs of different projects. The segmented partition 5 can be made of wooden boards.

Claims

1. A tunnel settlement control structure, characterized in that: The invention comprises a tunnel main tunnel primary support steel arch frame (1), a plurality of groups of connecting steel plates (3) are symmetrically arranged on both sides of the arch foot position of the tunnel main tunnel primary support steel arch frame (1), the connecting steel plates (3) are arranged between two adjacent steel arch frames on the same side, anchor pipe holes are processed on the connecting steel plates (3), and the locking foot anchor pipes (4) are driven into the surrounding rock through the anchor pipe holes. A temporary invert (2) is constructed at the arch line position of the tunnel main tunnel to close the tunnel primary support structure into a ring in advance.

2. A tunnel settlement control structure according to claim 1, characterized in that: The connecting steel plate (3) is processed with 1 to 3 anchor pipe holes.

3. The tunnel settlement control structure according to claim 1, characterized in that: The locking foot anchor pipe (4) comprises an anchor pipe body (4-1), the anchor pipe body (4-1) is a hollow structure and one end is tapered, a plurality of circles of grouting holes (4-2) are processed on the anchor pipe body (4-1), and two adjacent circles of grouting holes (4-2) are arranged in a staggered manner, and a plurality of circles of barbs (4-3) are arranged on the outer wall of the anchor pipe body (4-1), and two adjacent circles of barbs (4-3) are arranged in a staggered manner.

4. A tunnel settlement control structure according to claim 3, characterized in that: The included angle between the barb (4-3) and the center line of the anchor pipe body (4-1) is 30° to 45°.

5. The tunnel settlement control structure according to claim 3, characterized in that: The barbs (4-3) are triangular structures.

6. The tunnel settlement control structure according to claim 1, characterized in that: The locking foot anchor pipe (4) is driven into the surrounding rock in a downward slanting manner, and the angle α between the locking foot anchor pipe (4) and the horizontal plane is 30° to 45°.

7. A tunnel settlement control structure according to claim 6, characterized in that: The temporary invert (2) is cast in sections using a segmented partition (5) as a template, and has a thickness of 40 to 50 cm.

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