Strong water-rich silty-fine sand layer T-shaped lock catch pipe-roofing tunnel advance support

Abstract

The utility model provides a T-shaped lock catch pipe-roofing tunnel advance support for a strong water-rich silty-fine sand layer, and relates to the technical field of tunnel advance supports. Comprising a plurality of steel pipes, clamping grooves are formed in the two sides of the steel pipe located in the middle, T-shaped lock catches are symmetrically and fixedly connected to the inner wall of the steel pipe located in the middle, and the T-shaped lock catches are inserted into the inner walls of the two clamping grooves correspondingly; a plurality of steel pipes are sequentially installed on the two sides of the steel pipe in the middle to form a middle pipe shed, and the steel pipes are connected through T-shaped lock catches. The bottom of the steel pipe is provided with an auxiliary supporting structure, the auxiliary supporting structure comprises a plurality of arc-shaped supporting plates, and the arc-shaped supporting plates are arranged at the bottom of the steel pipe at equal intervals. Slurry accumulation is promoted, and the surrounding rock grouting reinforcement effect is enhanced.

Description

Technical Field

[0001] This utility model relates to the field of tunnel pre-support technology, and in particular to a T-type locking pipe curtain tunnel pre-support for a strong water-rich fine sand layer. Background Technology

[0002] In the construction of highways, railways, and municipal roads, underground projects such as tunnels that pass through water-rich and soft strata need to first carry out pre-reinforcement of the surrounding rock (curtain grouting, etc.) or advanced support of the surrounding rock (pipe roof, advanced grouting pipe, etc.). For projects that pass through strong water-rich and weakly consolidated fine sand strata, conventional curtain grouting and advanced pipe roof are not effective for grouting reinforcement of the surrounding rock.

[0003] Grouting in water-rich, weakly consolidated fine sand formations is difficult to accumulate and tends to disperse, failing to achieve the expected rock reinforcement effect.

[0004] Therefore, this utility model provides an advanced support for a T-shaped locking pipe curtain tunnel with a strong water-rich fine sand layer. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide an advanced support for a T-type locking pipe curtain tunnel in a water-rich fine sand layer.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: an advanced support for a T-shaped locking pipe curtain tunnel in a water-rich fine sand layer, comprising several steel pipes. The steel pipe located in the middle position has slots on both sides. T-shaped locking buckles are symmetrically fixed to the inner wall of the middle steel pipe, and are respectively inserted into the inner walls of the two slots. Multiple steel pipes are sequentially installed on both sides of the middle steel pipe to form a central pipe shed. The steel pipes are connected by T-shaped locking buckles. An auxiliary support structure is provided at the bottom of the steel pipe, including several arc-shaped support plates arranged equidistantly at the bottom of the steel pipe. An auxiliary limiting structure is provided at the top of the steel pipe, including a limiting arc plate, with connecting plates fixedly connected to both sides of the limiting arc plate.

[0007] In a preferred embodiment, the bottom of the arc-shaped support plate is provided with a rectangular slot, the inner wall of the rectangular slot is fitted with a rectangular plate, and the top of the rectangular plate is symmetrically fixed with two rectangular auxiliary plates, forming a slot between the two rectangular auxiliary plates for the arc-shaped support plate to be inserted. The inner wall of the rectangular auxiliary plate is provided with a second insertion hole, and the inner wall of the arc-shaped support plate is provided with a first insertion hole. Threaded rods are inserted into the inner walls of the first and second insertion holes, and a nut is fixed at one end of the threaded rod.

[0008] The technical effect of adopting the above-mentioned further solution is that the rectangular slot and the rectangular plate can be interlocked, thereby providing auxiliary support for multiple arc-shaped support plates. At this time, the steel pipe can be provided with auxiliary support, so that the steel pipe can be firmly fixed on the top of the arc-shaped support plate.

[0009] In a preferred embodiment, auxiliary slots are provided on both sides of the arc-shaped support plate, and auxiliary plates are fixedly connected to both sides of the connecting plate.

[0010] The technical effect of adopting the above-mentioned further solution is that the auxiliary slot and the auxiliary plate can lock and limit the arc-shaped support plate and the connecting plate, thereby enabling the limiting arc plate to provide auxiliary limiting for the top of the steel pipe.

[0011] In a preferred embodiment, rectangular blocks are fixedly connected to both sides of the auxiliary card plate, and a second screw hole is provided on the inner wall of the rectangular block. A first screw hole is provided on both sides of the arc-shaped support plate, and a threaded clamping rod is threadedly connected to the inner wall of the first screw hole and the second screw hole.

[0012] The technical effect of adopting the above-mentioned further solution is that, under the action of the threaded clamp, the first screw hole can cooperate with the second screw hole to fix the arc-shaped support plate and the auxiliary clamping plate, thereby ensuring the stability of the auxiliary clamping plate.

[0013] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0014] This invention creatively employs a T-shaped interlocking micro-tube curtain structure to form a nearly closed arched bottom, creating a sealed water-stopping tube curtain that promotes grout accumulation and enhances the grouting reinforcement effect of the surrounding rock. Specifically, the effects are as follows:

[0015] 1. The T-shaped interlocking micro-tube curtain structure solves the pain points of grout not accumulating and grouting spreading, which fails to achieve the expected grouting reinforcement effect of the surrounding rock; by forming a nearly closed arch shell bottom, it forms a sealed water-stopping tube curtain, promotes grout accumulation, and enhances the grouting reinforcement effect of the surrounding rock.

[0016] 2. After the steel pipe is grouted, an integral arch shell structure with a certain strength is formed, which, together with the upper and lower grouted and reinforced soil layers (especially the upper grouted and reinforced soil layer), forms a "slab arch" structure with a certain thickness.

[0017] 3. The T-shaped interlocking micro-pipe curtain structure also has a certain effect on preventing piping in water-rich, weakly consolidated silty sand formations (or can improve the ability of semi-lithified formations to resist the risk of sudden inrush during tunnel construction after being disturbed by construction). Attached Figure Description

[0018] Figure 1 A schematic diagram of the structure of a T-shaped interlocking pipe curtain tunnel with strong water-rich fine sand layer provided by this utility model;

[0019] Figure 2 A cross-sectional view of a T-shaped interlocking pipe curtain tunnel with strong water-rich fine sand layer provided by this utility model;

[0020] Figure 3 A schematic diagram of the structure of the arc-shaped support plate for the advanced support of a T-shaped interlocking pipe curtain tunnel with strong water-rich fine sand layer provided by this utility model;

[0021] Figure 4 A schematic diagram of the rectangular clamping plate structure for the advanced support of a T-shaped locking pipe curtain tunnel in a water-rich fine sand layer provided by this utility model.

[0022] Figure 5 This utility model provides a schematic diagram of the limiting arc plate structure for the advanced support of a T-shaped locking pipe curtain tunnel in a water-rich fine sand layer.

[0023] Figure 6 This invention provides a construction principle diagram of an embodiment of a T-shaped interlocking pipe curtain tunnel advanced support for a water-rich fine sand layer.

[0024] In the diagram: 1-Steel pipe; 2-Auxiliary support structure; 21-Arc-shaped support plate; 22-Rectangular slot; 23-First insertion hole; 24-Rectangular plate; 25-Rectangular auxiliary plate; 26-Second insertion hole; 27-Threaded rod; 28-Fixing nut; 3-Auxiliary limiting structure; 31-Auxiliary slot; 32-First screw hole; 33-Auxiliary plate; 34-Connecting plate; 35-Limiting arc plate; 36-Rectangular block; 37-Second screw hole; 38-Threaded rod; 4-Slot; 5-T-type lock. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] like Figures 1-5As shown, this embodiment provides a technical solution: a T-type locking pipe curtain tunnel pre-support for a high-water-rich fine sand layer, comprising steel pipe 1, the pipe body 1 being densely packed Φ89 steel pipes with a wall thickness δ=6mm, and several steel pipes 1. The steel pipe 1 located in the middle position has slots 4 on both sides. T-type locking buckles 5 are symmetrically fixed to the inner wall of the middle steel pipe 1, and the T-type locking buckles 5 are respectively inserted into the inner walls of the two slots 4. Multiple steel pipes 1 are sequentially installed on both sides of the middle steel pipe 1 to form a central pipe canopy, and the steel pipes 1 are connected by T-type locking buckles. The steel pipe 1 is connected by a buckle 5; an auxiliary support structure 2 is provided at the bottom of the steel pipe 1, the auxiliary support structure 2 includes an arc-shaped support plate 21, the number of arc-shaped support plates 21 is several and they are arranged at equal intervals at the bottom of the steel pipe 1; an auxiliary limiting structure 3 is provided at the top of the steel pipe 1, the auxiliary limiting structure 3 includes a limiting arc plate 35, and connecting plates 34 are fixedly connected to both sides of the limiting arc plate 35. This utility model creatively adopts a T-shaped locking micro pipe curtain structure to form a nearly closed arch shell bottom, forming a sealed water-stopping pipe curtain, promoting grout accumulation, and strengthening the grouting reinforcement effect of the surrounding rock.

[0027] Going a step further, such as Figures 3-4 As shown: A rectangular slot 22 is provided at the bottom of the arc-shaped support plate 21. A rectangular plate 24 is engaged with the inner wall of the rectangular slot 22. Two rectangular auxiliary plates 25 are symmetrically fixed to the top of the rectangular plate 24. A slot for inserting the arc-shaped support plate 21 is formed between the two rectangular auxiliary plates 25. A second insertion hole 26 is provided on the inner wall of the rectangular auxiliary plate 25. A first insertion hole 23 is provided on the inner wall of the arc-shaped support plate 21. A threaded rod 27 is inserted into the inner wall of the first insertion hole 23 and the second insertion hole 26. A nut 28 is fixed at one end of the threaded rod 27. The rectangular slot 22 and the rectangular plate 24 can be engaged, thereby providing auxiliary support for multiple arc-shaped support plates 21. At this time, the steel pipe 1 can be provided with auxiliary support, so that the steel pipe 1 can be stably placed on the top of the arc-shaped support plate 21.

[0028] The above solution also has the problem that the top of the steel pipe 1 is not restrained and can easily slip off the curved support plate 21, such as... Figure 3 and Figure 5 As shown: In this scheme, auxiliary slots 31 are provided on both sides of the arc-shaped support plate 21, and auxiliary plates 33 are fixedly connected to both sides of the connecting plate 34. The auxiliary slots 31 and auxiliary plates 33 can lock and limit the arc-shaped support plate 21 and the connecting plate 34, thereby allowing the limiting arc plate 35 to provide auxiliary limiting for the top of the steel pipe 1.

[0029] The above solution also suffers from an unstable fixation between the auxiliary card plate 33 and the arc-shaped support plate 21, such as... Figure 3 and Figure 5As shown, rectangular blocks 36 are fixedly connected to both sides of the auxiliary plate 33. The inner wall of the rectangular blocks 36 is provided with a second screw hole 37. The two sides of the arc-shaped support plate 21 are provided with a first screw hole 32. The inner walls of the first screw hole 32 and the second screw hole 37 are threadedly connected with a threaded clamping rod 38. Under the action of the threaded clamping rod 38, the first screw hole 32 can cooperate with the second screw hole 37 to fix the arc-shaped support plate 21 and the auxiliary plate 33, thereby ensuring the stability of the auxiliary plate 33.

[0030] Working principle:

[0031] like Figure 1-6 As shown:

[0032] Steel pipes for pipe draping outside the tunnel 1: T-shaped locking buckles are welded on one side of the central pipe shed, and grooves are cut on the other side of the central pipe shed; the first pipe adopts bidirectional grooves and radial welding of connecting steel plates in the middle, or T-shaped locking buckles are welded on both sides of the central pipe shed 5;

[0033] The bottom of the symmetrical steel pipe 1 is supported: the rectangular card plate 24 is inserted into the inner wall of the rectangular card slot 22, the arc-shaped support plate 21 is inserted between the two rectangular auxiliary plates 25, the threaded rod 27 is inserted into the inner wall of the first insertion hole 23 and the second insertion hole 26, and the fixing nut 28 is fixed to the threaded rod 27.

[0034] Limiting the top of steel pipe 1: At this time, the auxiliary card plate 33 is inserted into the inner wall of the auxiliary card slot 31, and the threaded card rod 38 is inserted into the inner wall of the first screw hole 32 and the second screw hole 37, so as to assist in fixing the limiting arc plate 35, thereby limiting the steel pipe 1.

[0035] 4. On-site construction of pipe jacking at the tunnel face: arch casting, pipe drilling, installation of the first steel pipe 1, drilling and sequential installation of steel pipe 1, grouting of the stratum from the arch top to the steel pipes 1 on both sides, high-strength cement grout (or double-liquid grout) injected into the steel pipe 1 after the stratum grouting is completed; after the strength is formed, the upper bench (upper pilot pit) of the tunnel is excavated frame by frame according to the designed steel arch frame spacing.

[0036] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A kind of strong water-rich fine sand layer T type lock catch pipe roof tunnel advance support, including steel pipe (1), it is characterized in that, The number of the steel pipe (1) is several, the both sides of the steel pipe (1) located in the middle are provided with clamping groove (4), the inner wall of the steel pipe (1) located in the middle is fixedly connected with T type lock catch (5) symmetrically, T type lock catch (5) is respectively inserted in the inner wall of two clamping grooves (4), the both sides of the steel pipe (1) located in the middle are sequentially installed with multiple steel pipes (1) and form middle pipe shed, the steel pipe (1) is connected by T type lock catch (5) between; The bottom of the steel pipe (1) is provided with auxiliary support structure (2), and the auxiliary support structure (2) includes arc-shaped support plate (21), the number of the arc-shaped support plate (21) is several and equidistantly arranged at the bottom of the steel pipe (1); The top of the steel pipe (1) is provided with auxiliary limiting structure (3), and the auxiliary limiting structure (3) includes limiting arc plate (35), and the both sides of the limiting arc plate (35) are fixedly connected with connecting plate (34).

2. The strong water-rich silt sand layer T-shaped lock buckle pipe roof tunnel advanced support according to claim 1, characterized in that: The bottom of the arc-shaped support plate (21) is provided with rectangular clamping groove (22), and the inner wall of the rectangular clamping groove (22) is clamped with rectangular clamping plate (24).

3. The advanced support of the T-type lock buckle pipe roof of the strong water-rich silt sand layer according to claim 2, characterized in that: The top of the rectangular clamping plate (24) is fixedly connected with two rectangular auxiliary plates (25) symmetrically, and the two rectangular auxiliary plates (25) form an insertion slot for the arc-shaped support plate (21) between.

4. The strong water-rich silt sand layer T-shaped lock buckle pipe roof tunnel advanced support of claim 3, characterized in that: The inner wall of the rectangular auxiliary plate (25) is provided with second insertion hole (26), the inner wall of the arc-shaped support plate (21) is provided with first insertion hole (23), the inner wall of the first insertion hole (23) and the second insertion hole (26) is inserted with threaded insertion rod (27), and one end of the threaded insertion rod (27) is fixed with nut (28).

5. The strong water-rich silt sand layer T-shaped lock buckle pipe roof tunnel advanced support of claim 1, wherein: The both sides of the arc-shaped support plate (21) are provided with auxiliary clamping groove (31), and the both sides of the connecting plate (34) are fixedly connected with auxiliary clamping plate (33).

6. The strong water-rich silt sand layer T-shaped lock buckle pipe roof tunnel advanced support of claim 5, characterized in that: The both sides of the auxiliary clamping plate (33) are fixedly connected with rectangular block (36), and the inner wall of the rectangular block (36) is provided with second threaded hole (37).

7. The strong water-rich silt sand layer T-shaped lock buckle pipe roof tunnel advanced support of claim 6, characterized in that: The both sides of the arc-shaped support plate (21) are provided with first threaded hole (32), and the inner wall of the first threaded hole (32) and the second threaded hole (37) is threadedly connected with threaded clamping rod (38).

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