Annular resistance limiter preliminary bracing structure suitable for large-deformation tunnel

Abstract

The utility model relates to the technical field of tunnel construction, and discloses an annular resistance limiter preliminary bracing structure suitable for a large-deformation tunnel, the overall preliminary bracing structure is annular, and the preliminary bracing structure comprises an A unit steel frame, and a B unit steel frame, a C unit steel frame and a D unit steel frame which are symmetrically mounted on two sides of the A unit steel frame; the two sides of the A unit steel frame are connected with the B unit steel frame through the resistance limiter supporting structure assemblies, the B unit steel frame is connected with the C unit steel frame, the C unit steel frame is connected with the D unit steel frames, and the two D unit steel frames are connected to form the overall annular resistance limiter primary supporting structure suitable for the large-deformation tunnel. When radial stress is applied to the primary support structure, expansion and penetration of cracks and formation of a macroscopic fracture surface can be effectively restrained through uniform deformation of the resistance limiter support structure assemblies at different positions, and the situation that annular cracks are generated in primary support concrete is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel construction, in particular to an annular limiter initial support structure suitable for a large deformation tunnel. Background Art

[0002] High geostress soft rock areas usually have high geostress levels and weak rock properties. Under this geological background, tunnel excavation will cause significant deformation of the rock mass, including extrusion, sliding, crack expansion, etc. Traditional initial support structures such as anchor rods and anchor nets can only provide limited stiffness and strength, and it is difficult to effectively control the deformation of the rock mass. These deformations will have a serious impact on the stability and safety of the tunnel, so effective initial support measures are needed to control the deformation. Utility Model Content

[0003] The utility model aims to provide an annular limiter initial support structure suitable for a large deformation tunnel, so as to solve the problems raised in the above-mentioned background technology.

[0004] The technical solution adopted by the utility model is:

[0005] The invention discloses an annular initial support structure of annular limiter suitable for a large deformation tunnel. The annular initial support structure of annular limiter suitable for a large deformation tunnel is annular in shape as a whole, and comprises an A-unit steel frame, and a B-unit steel frame, a C-unit steel frame and a D-unit steel frame symmetrically installed on both sides of the A-unit steel frame; both sides of the A-unit steel frame are connected to the B-unit steel frame through a limiter support structure assembly, the B-unit steel frame is connected to the C-unit steel frame on the side away from the A-unit steel frame, and the C-unit steel frame is connected to the D-unit steel frame on the side away from the B-unit steel frame, and the two groups of D-unit steel frames are connected to form an overall annular initial support structure of annular limiter suitable for a large deformation tunnel.

[0006] Furthermore, the A unit steel frame, the B unit steel frame, the C unit steel frame and the D unit steel frame are all provided with I-beams, and the ends of the I-beams are welded with connecting steel plates through unequal connecting steel plates; the connecting steel plates at the ends of the I-beams of the A unit steel frame are bolted to the limiter support structure assembly, the connecting steel plates at the ends of the I-beams of the B unit steel frame are bolted to the limiter support structure assembly and the C unit steel frame, the connecting steel plates at the ends of the I-beams of the C unit steel frame are bolted to the B unit steel frame and the D unit steel frame, and the D unit steel frames are bolted to each other through the connecting steel plates at the ends of the I-beams.

[0007] Furthermore, the limiter support structure assembly includes two transverse steel plates and a plurality of vertical steel plates, wherein the plurality of vertical steel plates are located between the two transverse steel plates, and both sides of the vertical steel plates are welded to the transverse steel plates; the transverse steel plates are bolted to the connecting steel plates at the ends of the I-beams.

[0008] Furthermore, threaded steel handles are provided on both sides of the transverse steel plate of the resistance limiter support structure assembly.

[0009] Furthermore, the annular limiter initial support structure suitable for a large deformation tunnel can be bolted to another annular limiter initial support structure suitable for a large deformation tunnel so that they extend longitudinally along the tunnel excavation direction.

[0010] Furthermore, through holes are provided on the transverse steel plates of the limiter support structure assembly; the transverse steel plates of the two groups of limiter support structure assemblies are connected by limiter lap steel plates and bolts, so that a connection is formed between the two groups of annular limiter initial support structures suitable for large deformation tunnels, extending longitudinally along the tunnel excavation direction.

[0011] The beneficial effects of the utility model are:

[0012] When the annular limiter initial support structure suitable for large deformation tunnels is subjected to radial stress, the uniform deformation of the limiter support structure components at different positions can effectively inhibit the expansion and penetration of cracks and the formation of macroscopic fracture surfaces, thereby avoiding the occurrence of annular cracks in the initial support concrete. Therefore, it is particularly suitable for large deformation tunnels.

[0013] The annular limiter initial support structure suitable for a large deformation tunnel can be bolted to another annular limiter initial support structure suitable for a large deformation tunnel so that it can be longitudinally extended along the tunnel excavation direction. During the tunnel construction process, the number of the annular limiter initial support structures suitable for the large deformation tunnel can be increased according to the radial stress of the large deformation tunnel, thereby ensuring the safety of the tunnel construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the initial support structure of the annular limiter applicable to a large deformation tunnel of the utility model;

[0015] Figure 2 It is a schematic diagram of the connection between the A-unit steel frame, the B-unit steel frame and the limiter support structure assembly of the annular limiter initial support structure suitable for a large deformation tunnel according to the utility model;

[0016] Figure 3 It is a schematic diagram of the connection between the B unit steel frame and the C unit steel frame of the initial support structure of the annular limiter for a large deformation tunnel according to the utility model;

[0017] Figure 4 It is a schematic diagram of the connection between the C unit steel frame and the D unit steel frame of the initial support structure of the annular limiter for a large deformation tunnel according to the utility model;

[0018] Figure 1—4, 1—A unit steel frame, 2—B unit steel frame, 3—C unit steel frame, 4—D unit steel frame, 5—limiter support structure assembly, 6—first I22b I-beam, 7—second I22b I-beam, 8—third I22b I-beam, 9—fourth I22b I-beam, 10—first connecting steel plate, 11—second connecting steel plate, 12—third connecting steel plate, 13—fourth connecting steel plate, 14—transverse steel plate, 15—vertical steel plate, 16—threaded steel handle, 17—limiter lap steel plate, 18—bolts. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings of the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example 1

[0020] This embodiment provides an annular limiter initial support structure suitable for large deformation tunnels, such as Figure 1 As shown, the annular limiter initial support structure suitable for large deformation tunnels is annular as a whole, and includes an A unit steel frame 1, and a B unit steel frame 2, a C unit steel frame 3 and a D unit steel frame 4 symmetrically installed on both sides of the A unit steel frame 1. Among them, both sides of the A unit steel frame 1 are connected to the B unit steel frame 2 through the limiter support structure assembly 5, the B unit steel frame 2 is connected to the C unit steel frame 3 on the side away from the A unit steel frame 1, and the C unit steel frame 3 is connected to the D unit steel frame 4 on the side away from the B unit steel frame 2, and the two groups of D unit steel frames 4 are connected to each other, so as to form an annular limiter initial support structure suitable for large deformation tunnels as a whole.

[0021] When the annular limiter initial support structure suitable for large deformation tunnels is subjected to radial stress, the limiter support structure components 5 on both sides of the A unit steel frame 1 can deform evenly, thereby effectively suppressing the expansion and penetration of cracks and the formation of macroscopic fracture surfaces, avoiding the occurrence of annular cracks in the initial support concrete, and is therefore particularly suitable for large deformation tunnels.

[0022] In addition to the conventional steel frame structure, the B unit steel frame 2, C unit steel frame 3 and D unit steel frame 4 on both sides of the A unit steel frame 1 are also provided with I22b I-beams. The I22b I-beams can not only increase the structural strength of the unit steel frame itself, but also realize the connection between the unit steel frames. Specifically, the ends of the I22b I-beams of each unit steel frame are welded with connecting steel plates through unequal side connecting steel plates; Figure 2As shown, the first connecting steel plate 10 at the end of the first I22b I-beam 6 of the A unit steel frame 1 is bolted to the resistor support structure assembly 5; Figure 2 and Figure 3 As shown, the second connecting steel plate 11 at the end of the second I22b I-beam 7 of the B unit steel frame 2 is bolted to the resistor support structure assembly 5, and at the same time, the second connecting steel plate 11 at the end of the second I22b I-beam 7 of the B unit steel frame 2 is bolted to the third connecting steel plate 12 at the end of the third I22b I-beam 8 of the C unit steel frame 3; Figure 3 and Figure 4 As shown, the third connecting steel plate 12 at the end of the third I22b I-beam 8 of the C unit steel frame 3 is bolted to the fourth connecting steel plate 13 at the end of the fourth I22b I-beam 9 of the D unit steel frame 4; similarly, the D unit steel frames 4 are bolted to each other through the fourth connecting steel plates 13 at the ends of the two fourth I22b I-beams 9.

[0023] Since the barrier support structure assembly 5 in the annular barrier initial support structure suitable for large deformation tunnels needs to be able to deform uniformly when subjected to radial stress, the barrier support structure assembly 5 in this embodiment adopts the following structure:

[0024] like Figure 2 As shown, the limiter support structure assembly 5 includes two transverse steel plates 14 and four vertical steel plates 15. The four vertical steel plates 15 are located between the two transverse steel plates 14, and both sides of the vertical steel plates 15 are welded to the transverse steel plates 14; the spacing between the two middle vertical steel plates 15 is 100 mm, and the spacing between the outer vertical steel plates 15 and the middle vertical steel plates 15 is 150 mm; the transverse steel plate 14 is connected to the first connecting steel plate 10 at the end of the first I22b I-beam 6 of the A unit steel frame 1, and the second connecting steel plate 11 at the end of the second I22b I-beam 7 of the B unit steel frame 2 by bolts.

[0025] The limiter support structure assembly 5 formed by the above structure has controllable deformation characteristics, and utilizes the good yield deformation capacity and peak residual bearing capacity of the transverse steel plate 14 and the vertical steel plate 15 to achieve the purpose of limiting the internal force of the structure and releasing the rock pressure under the action of high ground stress. The limiter support structure assembly 5 is embedded in the key stress position on the upper part of the steel frame, and the traditional rigid support is optimized into a "rigid + flexible + rigid" type potential energy support structure, which effectively inhibits the expansion and penetration of cracks and the formation of macroscopic fracture surfaces, and avoids the occurrence of circumferential cracks in the primary support concrete.

[0026] Furthermore, considering the convenience of installing the resistance limiting device support structure assembly 5, as shown in FIG. Figure 2 As shown, threaded steel handles 16 are provided on both sides of the transverse steel plate 14 of the resistor support structure assembly 5 . Example 2

[0027] On the basis of Example 1, if the annular limiter initial support structure suitable for a large deformation tunnel is subjected to a large radial stress, the annular limiter initial support structure suitable for a large deformation tunnel can also be bolted to another annular limiter initial support structure suitable for a large deformation tunnel so that it extends longitudinally along the tunnel excavation direction. The number of the annular limiter initial support structures suitable for a large deformation tunnel can be increased according to the radial stress of the large deformation tunnel, thereby ensuring the safety of tunnel construction.

[0028] like Figure 2 As shown, in this embodiment, through holes are provided on the transverse steel plates 14 of the limiter support structure assembly 5; the transverse steel plates 14 of the two groups of limiter support structure assemblies 5 are connected by the limiter overlap steel plates 17 and bolts 18, so that the two groups of annular limiter initial support structures suitable for large deformation tunnels are connected and extend longitudinally along the tunnel excavation direction, so that the number of annular limiter initial support structures suitable for large deformation tunnels is increased according to the radial stress of the large deformation tunnel, thereby ensuring the safety of tunnel construction.

[0029] The above shows and describes the basic principle, main features and 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 of the utility model is defined by the attached claims and their equivalents.

Claims

1. An annular limiter initial support structure suitable for large deformation tunnels, characterized by: The annular limiter initial support structure suitable for large deformation tunnels is annular in shape as a whole, and includes an A-unit steel frame, and B-unit steel frames, C-unit steel frames and D-unit steel frames symmetrically installed on both sides of the A-unit steel frame; The two sides of the A unit steel frame are connected to the B unit steel frame through the limiter support structure assembly, the B unit steel frame is connected to the C unit steel frame on the side away from the A unit steel frame, and the C unit steel frame is connected to the D unit steel frame on the side away from the B unit steel frame. The two groups of D unit steel frames are connected to form an overall annular limiter initial support structure suitable for large deformation tunnels; The limiter support structure assembly includes two transverse steel plates and a plurality of vertical steel plates, wherein the plurality of vertical steel plates are located between the two transverse steel plates, and both sides of the vertical steel plates are welded to the transverse steel plates; the transverse steel plates are connected to the connecting steel plates at the ends of the I-beams by bolts; Threaded steel handles are provided on both sides of the transverse steel plate of the resistance limiter support structure assembly; The annular limiter initial support structure applicable to a large deformation tunnel can be bolted to another annular limiter initial support structure applicable to a large deformation tunnel so as to extend longitudinally along the tunnel excavation direction; The transverse steel plates of the limiter support structure assembly are all provided with through holes; the transverse steel plates of the two groups of limiter support structure assemblies are connected by limiter overlap steel plates and bolts, so that the two groups of annular limiter initial support structures suitable for large deformation tunnels are connected and extend longitudinally along the tunnel excavation direction.

2. The annular limiter initial support structure suitable for large deformation tunnels according to claim 1 is characterized in that: The A unit steel frame, the B unit steel frame, the C unit steel frame and the D unit steel frame are all provided with I-beams, and the ends of the I-beams are welded with connecting steel plates through unequal-sided connecting steel plates; The connecting steel plate at the end of the I-beam of the A unit steel frame is bolted to the limiter support structure assembly, the connecting steel plate at the end of the I-beam of the B unit steel frame is bolted to the limiter support structure assembly and the C unit steel frame, the connecting steel plate at the end of the I-beam of the C unit steel frame is bolted to the B unit steel frame and the D unit steel frame, and the D unit steel frames are connected to each other through the connecting steel plate at the end of the I-beam bolts.

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