Multi-stage cover arch structure for supporting tunnel portal

Abstract

The utility model relates to the field of cover arches, in particular to a multistage cover arch structure for tunnel portal supporting, which comprises I-shaped steel, an orifice pipe and a fastening assembly, the orifice pipe is fixedly arranged in a notch of the I-shaped steel through a pipe clamp, the fastening assembly is arranged at the end part of the orifice pipe, and the fastening assembly comprises a fastening pipe, a fastening plate, a fastening nut and a fastening piece. The fastening pipe is arranged at the end of the orifice pipe in a threaded and sleeved mode, a containing hole is formed in the circumferential wall of the fastening pipe, the fastening plate is rotationally arranged in the containing hole, the plate face of the fastening plate is perpendicular to the end face of the orifice pipe, the fastening nut is arranged on the fastening pipe in a threaded and sleeved mode, and the fastener is arranged in the fastening pipe and fixedly connected to the fastening plate. The effects that when the seamless steel pipes are inserted into the orifice pipes to build the pipe shed, angle errors among the seamless steel pipes are avoided, and the stability and the supporting effect of the steel pipes of the pipe shed are enhanced are achieved.

Description

Technical Field

[0001] The present application relates to the field of sleeve arches, and in particular to a multi-stage sleeve arch structure for tunnel portal support. Background Art

[0002] At present, the sleeve arch structure is a construction technology widely used in tunnel engineering. It is mainly used in the construction process of the tunnel portal section to provide temporary or permanent support to ensure the safety and stability of the construction. In the tunnel portal section, due to the complexity of geological conditions and the uncertainty of the construction environment, the sleeve arch structure can provide a safe working space for construction personnel and equipment, while preventing the collapse of soil and rocks, ensuring the stability and durability of the tunnel entrance.

[0003] When the existing sleeve arch is used for advance support of the tunnel entrance, the sleeve arch structure is first built by welding an I-beam and a connecting plate, and then pouring concrete. An orifice pipe is fixed on the sleeve arch structure, and the orifice pipe is used to insert a seamless steel pipe to build a pipe shed.

[0004] The above-mentioned existing technical solutions have the following defects: when building the sleeve arch at the tunnel entrance, the surrounding wall of the seamless steel pipe for building the pipe rack is inserted into the orifice pipe, and there will be a gap between the seamless steel pipe and the orifice pipe. When the seamless steel pipe is inserted into the mountain to build the pipe rack, there will be angular errors between the multiple seamless steel pipes, resulting in reduced overall stability of the steel pipes of the pipe rack built subsequently and poor supporting effect. Utility Model Content

[0005] In order to avoid angular errors between multiple seamless steel pipes when seamless steel pipes are inserted into orifice pipes to build a pipe rack, the present application strengthens the stability and supporting effect of the pipe rack steel pipes and provides a multi-stage arch structure for tunnel portal support.

[0006] The above technical objectives of this application are achieved through the following technical solutions:

[0007] A multi-stage sleeve arch structure for tunnel portal support, comprising an I-beam, an orifice pipe and a fastening assembly, wherein the orifice pipe is fixedly arranged in a notch of the I-beam by a pipe clamp, and the fastening assembly is arranged at the end of the orifice pipe. The fastening assembly comprises a fastening pipe, a fastening plate, a fastening nut and a fastener, wherein the fastening pipe is threadedly sleeved on the end of the orifice pipe, a placement hole is opened on the peripheral wall of the fastening pipe, the fastening plate is rotatably arranged in the placement hole, the fastening plate surface is perpendicular to the end face of the orifice pipe, the fastening nut is threadedly sleeved on the fastening pipe, the fastener is arranged in the fastening pipe, and the fastener is fixedly connected to the fastening plate.

[0008] By adopting the above technical scheme, by arranging I-beams, orifice pipes and fastening components, the seamless steel pipe is inserted into the fastening pipe and the orifice pipe, and the fastening nut is turned in the direction close to the orifice pipe, the fastening nut squeezes the fastening plate, so that the fastener in the fastening pipe moves toward the axis of the fastening pipe until the peripheral wall of the fastener fits the peripheral wall of the seamless steel pipe, thereby fixing the seamless steel pipe and ensuring that the seamless steel pipe is coaxial with the orifice pipe, avoiding the presence of a gap between the peripheral wall of the seamless steel pipe and the inner wall of the orifice pipe, which leads to the problem of angle deviation between multiple seamless steel pipes after the pipe shed is built.

[0009] Optionally, threads are formed on the side wall of the fastening plate, and the fastening nut engages with the threads on the fastening plate.

[0010] By adopting the above technical solution, the fastening plate and the fastening nut are connected by threads, so that the fastening nut can be fixed on the peripheral wall of the fastening pipe, and the fastening nut can be used to drive the fastening plate to move conveniently.

[0011] Optionally, the fastening assembly further includes a spring, a connecting rod is fixedly connected to the fastening plate, and the spring is arranged between the connecting rod and the outer peripheral wall of the fastening tube.

[0012] By adopting the above technical solution, the spring can make the fastening plate automatically reset when the fastening nut is loosened, thereby improving efficiency.

[0013] Optionally, the fastener is a bent cylinder, and the curved arc opening of the fastener faces away from the fastening plate.

[0014] By adopting the above technical solution and setting the curved cylinder, the fastener can avoid damaging the circumferential wall of the seamless steel pipe when it moves and fits against the circumferential wall of the seamless steel pipe.

[0015] Optionally, the inner wall of the fastening nut is flared, and the flaring is toward the orifice tube.

[0016] By adopting the above technical solution, the fastening nut with a flared inner wall saves more effort when squeezing the fastening plate, thereby improving installation efficiency.

[0017] Optionally, the arch structure also includes an arch base frame, which includes a first connecting plate and a second connecting plate. The arch base frame is divided into two layers of upper and lower arch structures. The lower layer is formed by splicing and fixing multiple pieces of the first connecting plates, and the upper layer is formed by splicing and fixing the second connecting plates and the I-beams alternately in sequence. The orifice tube is fixed in the groove of the I-beam away from the first connecting plate.

[0018] By adopting the above technical solution, by setting the first connecting plate and the second connecting plate in combination with the I-beam to form a multi-stage arch structure, it is possible to provide advanced support for the tunnel entrance, avoid collapse of the tunnel entrance, and improve safety.

[0019] Optionally, the sleeve arch structure also includes a supporting wall, which is arranged at the lower part of the sleeve arch structure, and a placement groove is opened on the upper surface of the supporting wall, the side wall of the first connecting plate is inserted in the placement groove, and the side wall of the I-beam is attached to the upper surface of the supporting wall.

[0020] By adopting the above technical solution and setting the supporting wall, the supporting wall can provide more stable support for the sleeve arch structure, thereby preventing the simple sleeve arch structure from shifting with the excavation of the tunnel.

[0021] Optionally, the arch structure also includes a reinforcement piece, which is arranged on both sides of the supporting wall. The reinforcement piece includes a backing plate and a reinforcement plate. The backing plate surface fits the supporting wall surface, and the reinforcement plate is fixed to the backing plate surface facing away from the supporting wall.

[0022] By adopting the above technical solution and providing reinforcing pieces, the reinforcing pieces can reinforce both sides of the supporting wall, thereby preventing the supporting wall from tilting during use as the tunnel is excavated.

[0023] In summary, this application has the following technical effects:

[0024] 1. By setting up I-beams, orifice pipes and fastening components, gaps between the circumferential wall of the seamless steel pipe and the inner wall of the orifice pipe are avoided, which causes angle deviations between multiple seamless steel pipes after the pipe shed is built;

[0025] 2. By setting up the supporting wall, it can provide more stable support for the sleeve arch structure, avoiding the displacement of the simple sleeve arch structure with the excavation of the tunnel;

[0026] 3. By setting up reinforcement pieces, both sides of the supporting wall can be reinforced to prevent the supporting wall from tilting during use as the tunnel is excavated. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is the appearance structure diagram of this application;

[0028] Figure 2 It is a prominent structural diagram of the fastening assembly of the present application.

[0029] Explanation of the reference numerals: 1. arch foundation frame; 11. first connecting plate; 12. second connecting plate; 13. I-beam; 14. fixing rib; 15. orifice tube; 2. fastening assembly; 21. fastening tube; 211. placement hole; 22. fastening plate; 221. connecting rod; 23. fastening nut; 24. fastener; 25. spring; 3. supporting structure; 31. supporting wall; 311. placement groove; 32. reinforcement member; 321. abutment plate; 322. reinforcement plate. DETAILED DESCRIPTION

[0030] The present application is further described in detail below in conjunction with the accompanying drawings.

[0031] The present application embodiment discloses a tunnel portal sleeve arch and pipe shed structure of a broken rock and soil mountain tunnel. Figure 1 The sleeve arch structure includes a sleeve arch foundation frame 1, a fastening assembly 2 and a support structure 3. The sleeve arch foundation frame 1 can provide advanced support for the tunnel opening, avoid collapse of the tunnel opening, and improve safety. The fastening assembly 2 can avoid the problem of angle deviation of multiple seamless steel pipes when the pipe shed structure is subsequently built. The support structure 3 provides more stable support for the sleeve arch structure, further improving safety.

[0032] Reference Figure 1 The arch foundation frame 1 is an arch structure constructed by combining and connecting the first connecting plate 11, the second connecting plate 12 and the I-beam 13. The first connecting plate 11 and the second connecting plate 12 are both steel plates. The arch foundation frame 1 is divided into an upper and lower structure. The lower structure is composed of a plurality of first connecting plates 11 spliced ​​and assembled into an arch structure. The first connecting plate 11 is a strip plate. The length directions of the two first connecting plates 11 are parallel to each other. The two first connecting plates 11 are connected by fixing ribs 14. The fixing ribs 14 are steel bars. The two ends of the fixing ribs 14 are bent and the two ends are respectively inserted into the surfaces of the two adjacent first connecting plates 11 and welded to the first connecting plates 11, so as to connect and fix the two first connecting plates 11. The upper structure is formed by splicing a second connecting plate 12 and an I-beam 13. The second connecting plate 12 is arranged on the upper parts of two adjacent I-beams 13. The second connecting plate 12 and the I-beams 13 are arranged alternately in sequence. The second connecting plate 12 is spaced apart from the first connecting plate 11. The I-beam 13 and the first connecting plate 11 are fixedly connected with bolts. Specifically, the bolts are passed through the first connecting plate 11 and through the web of the I-beam 13. After the nuts are connected to the bolts, they are tightened against the web. The length direction of the I-beam 13 is parallel to the length direction of the first connecting plate 11.

[0033] Reference Figure 1 The arch foundation frame 1 also includes an orifice tube 15. Two slots are formed in the length direction of the I-beam 13. The orifice tube 15 is fixed in the slot of the I-beam 13 away from the first connecting plate 11 by a pipe clamp. The length direction of the orifice tube 15 is parallel to the length direction of the I-beam 13, and the length of the orifice tube 15 is greater than the length of the I-beam 13.

[0034] Combination Figure 1 and Figure 2The fastening assembly 2 is arranged at the end of the orifice tube 15. The fastening assembly 2 is arranged at both ends of each orifice tube 15. The fastening assembly 2 includes a fastening tube 21. The fastening tube 21 is sleeved on the outer wall of the end of the orifice tube 15. The inner peripheral wall of one end of the fastening tube 21 is fixedly connected with the outer peripheral wall of the end of the orifice tube 15 by threads. A placement hole 211 is opened on the peripheral wall of the fastening tube 21. The placement hole 211 connects the inside and outside of the fastening tube 21. The placement hole 211 is a rectangular hole and four are opened. The four placement holes 211 are distributed at equal angles on the peripheral wall of the fastening tube 21 with the axis of the fastening tube 21 as the center.

[0035] Combination Figure 1 and Figure 2 The fastening assembly 2 also includes a fastening plate 22 and a fastening nut 23. The fastening plate 22 is rotatably arranged in the placement hole 211. The fastening plate 22 is a fan-shaped plate. There are four fastening plates 22. The four fastening plates 22 are respectively arranged in four placement holes 211. The plane where the fastening plate 22 plate surface is located is perpendicular to the plane where the end surface of the fastening tube 21 is located. The tip of the fastening plate 22 is hinged on the side wall opposite to the placement hole 211. The hinge is far away from the end of the orifice tube 15. The fastening plate 22 is located on the side wall outside the fastening tube 21 and is processed to form a thread perpendicular to its plate surface. The fastening nut 23 is sleeved on the fastening tube 21. The fastening nut 23 is a hexagonal nut. The inner wall of the fastening nut 23 with threads is expanded, and the expansion faces the orifice tube 15. The threads of the fastening nut 23 are engaged with the threads on the side wall of the fastening plate 22.

[0036] Combination Figure 1 and Figure 2 The fastening assembly 2 further includes a fastener 24 and a spring 25. The fastener 24 is arranged in the fastening tube 21. The fastener 24 is a curved cylinder. The middle of the peripheral wall of the fastener 24 is fixedly connected to the side wall of the fastening plate 22 and is located at the end of the fastening plate 22 away from the tip. The arc opening of the fastener 24 faces away from the fastening plate 22. There are four fasteners 24, and the four fasteners 24 are respectively arranged on four fastening plates 22. A connecting rod 221 is fixedly connected to one end of the arc surface of the fastening plate 22. The connecting rod 221 is a square rod. The connecting rod 221 is located outside the fastening tube 21, and one side wall of the connecting rod 221 is flush with the side wall of the fastening plate 22. The spring 25 is arranged between the connecting rod 221 and the peripheral wall of the fastening tube 21. One end of the spring 25 is fixedly connected to the end of the side wall of the connecting rod 221 away from the fastening plate 22, and the other end of the spring 25 is fixedly connected to the peripheral wall of the fastening tube 21.

[0037] Combination Figure 1 and Figure 2After the arch structure is built, when the seamless steel pipe is inserted to build the pipe shed structure, the seamless steel pipe is inserted in the fastening pipe 21 and the orifice pipe 15, and the fastening nut 23 is screwed in the direction close to the orifice pipe 15. The fastening nut 23 squeezes the fastening plate 22, so that the fastener 24 in the fastening pipe 21 moves toward the axis of the fastening pipe 21 until the peripheral wall of the fastener 24 fits the peripheral wall of the seamless steel pipe, fixes the seamless steel pipe, and at the same time ensures that the seamless steel pipe is coaxial with the orifice pipe 15, avoiding the gap between the peripheral wall of the seamless steel pipe and the inner wall of the orifice pipe 15, resulting in the problem of angle deviation between multiple seamless steel pipes after the pipe shed is built.

[0038] Reference Figure 1 The supporting structure 3 includes a supporting wall 31 and a reinforcement member 32. The supporting wall 31 is arranged at the lower part of the sleeve arch foundation frame 1. The supporting wall 31 is formed by steel bars and concrete casting. The supporting wall 31 is vertically arranged. A placement groove 311 is opened on the upper surface of the supporting wall 31. The length direction of the placement groove 311 is parallel to the length direction of the upper surface of the supporting wall 31. The side walls of the first connecting plates 11 at both ends of the lower arch structure of the sleeve arch foundation frame 1 are inserted into the placement groove 311, and the side walls of the I-beams 13 at both ends of the upper arch structure are attached to the upper surface of the supporting wall 31. The supporting wall 31 provides a more stable support for the sleeve arch structure. The reinforcing member 32 is arranged at the lower part of both sides of the supporting wall 31, and the triangular reinforcement frame includes a support plate 321 and a reinforcing plate 322. The surface of the support plate 321 is in contact with the wall surface of the supporting wall 31, and the side wall of the reinforcing plate 322 is fixedly connected to the surface of the support plate 321 facing away from the supporting wall 31. The surface of the reinforcing plate 322 is perpendicular to the surface of the support plate 321 and the reinforcing plate 322 is vertically arranged. The side walls of the reinforcing plate 322 and the support plate 321 adjacent to the ground are in contact with the ground. The reinforcing member 32 reinforces the supporting wall 31 to prevent the supporting wall 31 from tilting.

[0039] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A multi-stage sleeve arch structure for tunnel portal support, characterized in that: The sleeve arch structure comprises an I-beam (13), an orifice pipe (15) and a fastening assembly (2); the orifice pipe (15) is fixed in a notch of the I-beam (13) by a pipe clamp, and the fastening assembly (2) is arranged at the end of the orifice pipe (15); The fastening assembly (2) comprises a fastening tube (21), a fastening plate (22), a fastening nut (23) and a fastener (24); the fastening tube (21) is threadedly sleeved on the end of the orifice tube (15); a placement hole (211) is opened on the peripheral wall of the fastening tube (21); the fastening plate (22) is rotatably arranged in the placement hole (211); the plate surface of the fastening plate (22) is perpendicular to the end surface of the orifice tube (15); the fastening nut (23) is threadedly sleeved on the fastening tube (21); the fastener (24) is arranged in the fastening tube (21); and the fastener (24) is fixedly connected to the fastening plate (22).

2. The multi-stage sleeve arch structure for tunnel portal support according to claim 1, characterized in that: The side wall of the fastening plate (22) is machined to have threads, and the fastening nut (23) is meshed with the threads on the fastening plate (22).

3. The multi-stage sleeve arch structure for tunnel portal support according to claim 1, characterized in that: The fastening assembly (2) further comprises a spring (25); a connecting rod (221) is fixedly connected to the fastening plate (22); and the spring (25) is arranged between the connecting rod (221) and the outer peripheral wall of the fastening tube (21).

4. The multi-stage sleeve arch structure for tunnel portal support according to claim 1, characterized in that: The fastener (24) is a curved cylinder, and the curved arc opening of the fastener (24) faces away from the fastening plate (22).

5. The multi-stage sleeve arch structure for tunnel portal support according to claim 4, characterized in that: The inner wall of the fastening nut (23) is in a flared shape, and the flaring is directed toward the orifice tube (15).

6. The multi-stage sleeve arch structure for tunnel portal support according to claim 1, characterized in that: The sleeve arch structure also includes an sleeve arch foundation frame (1), the sleeve arch foundation frame (1) includes a first connecting plate (11) and a second connecting plate (12), the sleeve arch foundation frame (1) is divided into an upper and lower arch structure, the lower layer is formed by splicing and fixing a plurality of the first connecting plates (11), and the upper layer is formed by splicing and fixing the second connecting plates (12) and the I-beams (13) alternately in sequence, and the orifice tube (15) is fixedly arranged in a groove of the I-beam (13) away from the first connecting plate (11).

7. The multi-stage sleeve arch structure for tunnel portal support according to claim 6, characterized in that: The sleeve arch structure also includes a supporting wall (31), which is arranged at the lower part of the sleeve arch base frame (1), and a placement groove (311) is opened on the upper surface of the supporting wall (31), the side wall of the first connecting plate (11) is inserted into the placement groove (311), and the side wall of the I-beam (13) is in contact with the upper surface of the supporting wall (31).

8. The multi-stage sleeve arch structure for tunnel portal support according to claim 7, characterized in that: The sleeve arch structure also includes a reinforcing member (32), which is arranged on both sides of the supporting wall (31), and includes a support plate (321) and a reinforcing plate (322), wherein the surface of the support plate (321) is in contact with the surface of the supporting wall (31), and the reinforcing plate (322) is fixedly connected to the surface of the support plate (321) facing away from the supporting wall (31).

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