Tunnel support steel arch anti-sinking device based on soft soil stratum

Abstract

The utility model discloses a tunnel support steel arch anti-sinking device based on a soft soil stratum, which comprises a tunnel, a plurality of steel arches which are longitudinally distributed at intervals are erected on the inner wall of the tunnel, anti-sinking devices are arranged at the lower ends of the two sides of each steel arch, each anti-sinking device comprises a micro pile arranged between the adjacent steel arches, and the micro piles are arranged on the inner wall of the tunnel. The miniature piles are inserted into a tunnel rock stratum, a plurality of soil nail rods are inserted into the side wall of the tunnel rock stratum from the side face of each miniature pile, the lower ends of the soil nail rods are obliquely inserted into the side wall of the tunnel rock stratum at equal intervals in the vertical direction, and the upper ends of the soil nail rods are all sleeved with oblique top plates. According to the anti-sinking device, the composite soil nailing wall structures are constructed on the two sides of the tunnel, the steel arch is supported on the basis of the composite soil nailing wall structures, safety is good, meanwhile, the number of supporting points is large, a constraint relation exists between the supporting points, and the anti-sinking performance of the steel arch is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel support equipment, and more specifically to a tunnel support steel arch anti-sinking device based on soft soil strata. Background Art

[0002] Tunnel excavation under soft soil geological conditions needs to consider the settlement of the soil, because soft soil has greater compressibility and settlement. If the tunnel excavation is unreasonable, it is easy to cause settlement and sinking of the soil. In the existing tunnel construction process, steel arch frames are generally used to support the tunnel surface. In the actual tunnel excavation and construction process, once the steel arch frame is under too much pressure, it is easy to sink. The sinking of the steel arch frame will affect the stability of the overall support structure and the safety of the construction personnel. At present, the use of relevant support and anti-sinking structures has the following problems: First, the existing support is generally based on the tunnel ground. When the soft soil layer settles, the foundation is not stable enough, which may cause the steel arch frame to sink as a whole, posing a safety hazard; second, the existing support is not good enough for the support stability of the steel arch frame. They are relatively independent of each other and have no limit relationship. The front and rear steel arch frames are prone to misalignment, which further affects the overall stability. Utility Model Content

[0003] The purpose of the utility model is to provide a tunnel support steel arch anti-sinking device based on soft soil strata. The anti-sinking device constructs a composite soil nail wall structure on both sides of the tunnel and supports the steel arch based on this. It has good safety. At the same time, there are many supporting points and there are constraint relationships between them, which further improves the anti-sinking performance of the steel arch.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] A tunnel support steel arch anti-sinking device based on soft soil strata comprises a tunnel, wherein the inner wall of the tunnel is provided with a plurality of steel arches distributed at longitudinal intervals, and the lower ends of both sides of the steel arches are provided with anti-sinking devices, and the anti-sinking device comprises micro piles arranged between adjacent steel arches, the micro piles are inserted into the interior of the tunnel rock strata, and the sides of the micro piles are provided with a plurality of soil nail rods inserted into the interior of the tunnel rock strata side walls, the lower ends of the plurality of soil nail rods are inclinedly inserted into the interior of the tunnel rock strata side walls at equal intervals up and down, and the upper ends of the plurality of soil nail rods are all provided with inclined top plates, the upper ends of the micro piles are provided with an arc-shaped support seat, and the arc-shaped support seat is connected to the inner side surface of a support plate, three support rods pass through the interior of the support plate, the three support rods are distributed in a triangular shape with respect to each other, and the rod bodies of the three support rods are provided with a plurality of concave supporting plates, and the plurality of concave supporting plates are respectively fitted at different positions on the lower sides of the steel arches.

[0006] As a further optimization of this solution, a linear support seat is provided in the middle position of the outer side surface of the inclined top plate, and the linear support seat is connected to the lower side surface of the bracket plate. A plurality of sleeves are provided at intervals on the lower surface of the inclined top plate, and the sleeves are respectively mounted on the upper ends of soil nail rods at different heights.

[0007] As a further optimization of this solution, shotcrete hanging nets are arranged between the adjacent steel arch frames, and the arc-shaped support seats and a plurality of soil nail rods pass through the gaps between the shotcrete hanging nets.

[0008] As a further optimization of this solution, the insertion depth of the micro pile is greater than five times the pile diameter and the micro pile is a micro steel pipe pile.

[0009] As a further optimization of this solution, the plurality of soil nail rods are provided with surrounding and spaced apart clamping blocks on their rod bodies.

[0010] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0011] In the utility model, a composite soil nail wall structure is constructed on the tunnel side wall by arranging micro piles and a plurality of soil nail rod structures, and the composite soil nail wall structure is used to support the bracket plate in all directions, thereby supporting the adjacent concave support plate, and finally realizing the support operation for all steel arch frames, thereby improving the anti-sinking effect of the steel arch frames, and based on the composite soil nail wall structure, the safety is better;

[0012] In the utility model, three support rods distributed in a triangle are arranged, combined with a concave support plate and a support plate structure, so that the front and rear concave support plates limit each other, reducing the misalignment between the front and rear steel arch frames. There are more support points and there are constraint relationships between them, which further improves the overall installation stability of the steel arch frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the installation structure of the anti-sinking device of the utility model (partially without grouting);

[0014] Figure 2 This is a schematic diagram of the inner structure of the bracket plate of the utility model;

[0015] Figure 3 This is a schematic diagram of the outer structure of the bracket plate of the utility model;

[0016] In the figure: 1. tunnel; 2. steel arch; 3. concave support plate; 4. support rod; 5. support plate; 6. micro pile; 7. soil nail rod; 8. arc support seat; 9. straight support seat; 10. inclined top plate; 11. sleeve; 12. shotcrete hanging net. DETAILED DESCRIPTION

[0017] In order to make the technical means, creative features, objectives and effects achieved by the utility model easy to understand, the utility model is further explained below with reference to specific diagrams.

[0018] In order to solve the problem that the existing support is generally based on the tunnel ground, when the soft soil layer settles, the foundation is not stable enough, which may cause the steel arch frame to sink as a whole, posing a safety hazard, such as Figure 1 As shown, the present application includes a tunnel 1, wherein a plurality of steel arch frames 2 are longitudinally spaced and arranged on the inner wall of the tunnel 1, and anti-sinking devices are arranged at the lower ends of both sides of the steel arch frames 2, and the anti-sinking devices include micro piles 6 arranged between adjacent steel arch frames 2, and the micro piles 6 are inserted into the rock formation of the tunnel 1, and a plurality of soil nail rods 7 are inserted into the rock formation side walls of the tunnel 1 on the sides of the micro piles 6;

[0019] like Figure 2 As shown, the lower ends of several soil nail rods 7 are inserted obliquely into the rock layer side wall of the tunnel 1 at equidistant intervals, and the upper ends of several soil nail rods 7 are all covered with inclined top plates 10, the upper ends of the micro piles 6 are provided with arc-shaped support seats 8, and the arc-shaped support seats 8 are connected to the inner side of the support plate 5, three support rods 4 pass through the inside of the support plate 5, the three support rods 4 are distributed in a triangular shape with respect to each other, and several concave support plates 3 are provided on the rod bodies of the three support rods 4, and several concave support plates 3 are respectively attached to different lower positions of the steel arch frame 2, a linear support seat 9 is provided at the middle position of the outer side of the inclined top plate 10, and the linear support seat 9 is connected to the lower side of the support plate 5, and several sleeves 11 are provided at intervals on the lower surface of the inclined top plate 10, and the sleeves 11 are respectively covered on the upper ends of the soil nail rods 7 at different heights.

[0020] Specifically, Figure 3 As shown, micro piles 6 and a plurality of soil nail rods 7 are used to construct a composite soil nail wall structure on the side wall of the tunnel 1. Based on the composite soil nail wall structure, the bracket plate 5 is fully supported by the arc support seat 8 and the linear support seat 9, and then the adjacent concave support plate 3 is supported, and finally the support operation for all steel arch frames 2 is realized. The foundation stability and reliability of the composite soil nail wall structure is better, and the influence caused by the settlement of the soft soil layer can be better prevented.

[0021] In order to solve the problem that the existing support for the steel arch frame is not stable enough, they are relatively independent of each other and have no limit relationship, and the front and rear steel arch frames are prone to misalignment, such as Figure 2 As shown, three support rods 4 pass through the inside of the support plate 5, the three support rods 4 are distributed in a triangular shape, and a plurality of concave support plates 3 are provided on the rod bodies of the three support rods 4, and the plurality of concave support plates 3 are respectively attached to different positions on the lower side of the steel arch frame 2;

[0022] Specifically, the three support rods 4 distributed in a triangle limit the rotational misalignment of the concave support plate 3 and the support plate 5, and at the same time limit the front and rear concave support plates 3 to each other, thereby reducing the misalignment between the front and rear steel arch frames 2. There are more support points and there are constraint relationships between them, which further improves the overall installation stability of the steel arch frame 2.

[0023] The standard parts used in the utility model can all be purchased from the market, and special-shaped parts can be customized according to the instructions and the drawings. The specific connection methods of each part adopt the conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt the conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology, which will not be described in detail here.

[0024] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A tunnel support steel arch anti-sinking device based on soft soil strata, comprising a tunnel, wherein the inner wall of the tunnel is provided with a plurality of longitudinally spaced steel arches, characterized in that: The lower ends of both sides of the steel arch frame are provided with anti-sinking devices, and the anti-sinking devices include micro-piles arranged between adjacent steel arch frames, the micro-piles are inserted into the tunnel rock formation, and a plurality of soil nail rods are inserted into the side of the micro-pile facing the tunnel rock formation side wall, the lower ends of the plurality of soil nail rods are equidistantly inserted into the tunnel rock formation side wall at upper and lower intervals, and the upper ends of the plurality of soil nail rods are all provided with inclined top plates, the upper ends of the micro-pile are provided with an arc-shaped support seat, and the arc-shaped support seat is connected to the inner side of the support plate, three support rods pass through the inside of the support plate, the three support rods are distributed in a triangular shape with respect to each other, and the rod bodies of the three support rods are provided with a plurality of concave support plates, and the plurality of concave support plates are respectively fitted at different positions on the lower side of the steel arch frame.

2. The anti-sinking device for tunnel support steel arch frame based on soft soil strata according to claim 1 is characterized by: A linear support seat is provided at the middle position of the outer side of the inclined top plate, and the linear support seat is connected to the lower side of the bracket plate. A plurality of sleeves are provided at intervals on the lower surface of the inclined top plate, and the sleeves are respectively mounted on the upper ends of soil nail rods at different heights.

3. The anti-sinking device for tunnel support steel arch frame based on soft soil strata according to claim 2 is characterized by: Shotcrete hanging nets are evenly arranged between the adjacent steel arch frames, and the arc-shaped support seats and a plurality of soil nail rods all pass through the gap positions of the shotcrete hanging nets.

4. The anti-sinking device for tunnel support steel arch frame based on soft soil strata according to claim 3 is characterized by: The insertion depth of the micro pile is greater than five times the pile body diameter and the micro pile is a micro steel pipe pile.

5. The tunnel support steel arch anti-sinking device based on soft soil strata according to claim 4 is characterized by: The rod bodies of the plurality of soil nail rods are provided with surrounding clamping blocks which are arranged at intervals.

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