A quick connector for initial support assembly of corrugated steel in tunnels

Abstract

The present invention relates to a quick joint for assembling initial support of corrugated steel in a tunnel, which is used to realize the quick assembly of adjacent corrugated steel plates in the longitudinal and circumferential directions in the initial support of the tunnel. The joint comprises an annular flange welded on the annular end face of the corrugated steel plate, a longitudinal flange welded on the longitudinal end face, an annular joint arranged on the annular flange, and a longitudinal joint arranged on the longitudinal flange. The annular joint is a sliding pin joint, and the longitudinal joint is an insert joint. Compared with the prior art, the annular joint and the longitudinal joint of the present invention respectively adopt the sliding pin and insert assembly methods, and do not need to use bolts, which greatly saves construction manpower and costs.

Description

Technical Field

[0001] The invention relates to the field of design of quick construction joints for tunnel prefabricated components, and in particular to a quick joint for initial support assembly of tunnel corrugated steel. Background Art

[0002] In tunnel construction, initial support is generally used to protect the newly excavated free surface, prevent the continuous development of surrounding rock deformation and damage, and provide protection for subsequent construction. At this stage, the initial tunnel support projects are all combined with anchor rods, steel arch frames, grid steel arch frames and other means. However, these initial support methods also have the problems of long construction period, complex means and operation, high manpower and material costs, and great safety hazards. How to reasonably design pre-support measures and assembly construction methods is the focus and hot spot of research.

[0003] The corrugated steel plate support structure has a large cross-section and high strength. When forming a continuous structure, the external concrete filling effect is good. The overall structure provides sufficient strength and has a certain deformation coordination. In addition, the corrugated steel plate support structure can be prefabricated and assembled, and has the potential for convenient processing and rapid construction. However, in the existing tunnel projects using corrugated steel support, the connection method of the corrugated steel plate is still the traditional bolt connection form. During construction, manual intervention is required to tighten the bolts. The manual steps are cumbersome, causing construction safety hazards and extended construction period, and are not conducive to the development of mechanized tunnel construction.

[0004] At present, in shield tunnels, the assembly of prefabricated segments has begun to consider the design of quick joints, resulting in a variety of special segments and quick joints for segment annular joints and longitudinal joints. Most of the new quick joints are boltless designs, which can better cooperate with shield machine construction. Although they are also prefabricated components of tunnels, corrugated steel plates are used for initial support. The scope of application and construction excavation methods are different from those of shield segments, and there are differences in structural types. The segment material is cast concrete, and the corrugated steel plate is a hot-rolled corrugated steel plate with an arc. Therefore, innovation and improvement need to be considered in the design of quick joints. Summary of the invention

[0005] The purpose of the present invention is to provide a quick connector for initial support assembly of tunnel corrugated steel in order to overcome the defects of the prior art.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A quick joint for assembling initial support of corrugated steel in a tunnel is used to realize quick assembly of adjacent corrugated steel plates in the longitudinal and circumferential directions in the initial support of the tunnel. The joint comprises an annular flange welded on the annular end face of the corrugated steel plate, a longitudinal flange welded on the longitudinal end face, an annular joint arranged on the annular flange and a longitudinal joint arranged on the longitudinal flange. The annular joint is a sliding pin type joint and the longitudinal joint is an inserted type joint.

[0008] The longitudinal joint comprises a male joint arranged on a longitudinal flange plate at one longitudinal end surface and a female joint arranged on a longitudinal flange plate at the other longitudinal end surface and inserted and clamped to match the male joint on the adjacent corrugated steel plate.

[0009] The male connector is a cylindrical protrusion that is larger in front and smaller in back, and the female connector is a cylindrical groove that is larger in bottom and smaller in mouth. A spring is provided at the bottom of the groove, and two sliding wedges are provided on the upper part of the spring and are arranged opposite to each other and slide along the side wall of the groove.

[0010] The opening diameter of the female connector groove is larger than the front end diameter of the male connector. The distance between the two relatively arranged sliding wedges is smaller than the diameter of the male connector when the male connector is not inserted. As the male connector is inserted, the spring is compressed inward, and the distance between the two relatively arranged sliding wedges gradually increases. When the male connector is fully inserted, the front end of the male connector is completely embedded between the two relatively arranged sliding wedges.

[0011] The longitudinal flange is welded with longitudinal stiffening ribs at the rear.

[0012] The surface of the annular flange is provided with a first transverse groove portion and a second transverse groove portion in sequence, and the annular joint comprises a T-shaped piece fixed on the first transverse groove portion and a C-shaped piece arranged between the first transverse groove portion and the second transverse groove portion.

[0013] The T-shaped piece is integrally formed by a bottom and a head with a T-shaped cross-section. The C-shaped piece is an inverted T-shaped groove connecting the first transverse groove portion and the second transverse groove portion, and a head plate is provided at the connection between the C-shaped piece and the first transverse groove portion to block the T-shaped piece during insertion. The shape of the inverted T-shaped groove matches the shape of the T-shaped head, and the width of the inverted T-shaped groove is smaller than the width of the first transverse groove portion and the second transverse groove portion.

[0014] The annular flange is welded with annular stiffening ribs at the rear.

[0015] The inner surface of the C-shaped piece is also provided with a sealing gasket.

[0016] The distance from the T-shaped piece to the longitudinal end face on one side is equal to the distance from the C-shaped piece to the end face on the other side. During the circumferential splicing, the two circumferentially adjacent corrugated steel plates are plugged in in opposite directions until the T-shaped piece is inserted into the C-shaped piece at the corresponding position of the circumferentially adjacent corrugated steel plates and the circumferential plug-in is completed after being limited by the head plate.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] (1) The flange of the present invention is arranged on the corrugated steel ring and the longitudinal end face, and does not occupy the clearance of the tunnel excavation section. After the construction and assembly are completed, the surface of the corrugated steel initial support structure is flat and continuous, and does not affect the waterproof performance.

[0019] (2) The design of the C-shaped and T-shaped parts of the circumferential joint meets the requirements of the assembly construction process. On the basis of meeting the strength and safety requirements, the surface shape of the T-shaped structure is smooth to prevent construction stress concentration. The detailed structural design includes stiffening ribs to improve the stability of the steel structure components.

[0020] (3) The plug-in joint design of the longitudinal joint utilizes the self-locking principle of the spring and wedge block. The construction force acts in a single direction, which facilitates longitudinal assembly without excessively increasing the degree of freedom of the joint.

[0021] (4) Through the assembly and coordination of the plug-in joint and the sliding pin joint, the large demand for bolt connections of traditional corrugated steel plates is effectively eliminated, which can greatly improve the assembly construction efficiency, reduce the construction labor cost, and reduce safety hazards. It has important engineering significance and economic benefits.

[0022] (5) The present invention adopts a quick joint structure design to transform the existing corrugated steel initial support structure connection method. Through the assembly and coordination of the plug-in joint and the sliding pin joint, the large demand for bolt connection of the traditional corrugated steel plate is effectively eliminated, which can greatly improve the assembly construction efficiency, reduce the construction labor cost, and reduce safety hazards. It has important engineering significance and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention.

[0024] Figure 2 Figure 2 is a plan view and assembly diagram of the annular joint, wherein Figure (2a) is the front view of the annular joint, Figure (2b) is the left view of the annular joint, Figure (2c) is the right view of the annular joint, and Figure (2d) is the assembly diagram of the C-shaped part and the T-shaped part of the annular joint.

[0025] Figure 3 It is a schematic diagram of the structure of the longitudinal joint, wherein Figure (3a) is a front view of the structure of the longitudinal joint, and Figure (3b) is an AA cross-sectional view of Figure (2a).

[0026] Figure 4 It is a schematic diagram of longitudinal joint assembly, wherein Figure (4a) is the longitudinal joint alignment step, Figure (4b) is the longitudinal joint insertion step, and Figure (4c) is the longitudinal joint locking step.

[0027] Description of the markings in the figure:

[0028] 1. Corrugated steel plate, 2. Flange, 3. Male joint, 4. Female joint, 5. T-shaped part, 6. C-shaped part, 7. Head plate, 8. Stiffening rib, 9. Sliding wedge, 10. Spring, 11. Sealing gasket. DETAILED DESCRIPTION

[0029] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0030] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention.

[0031] The invention provides a quick joint for initial support assembly of corrugated steel in a tunnel, comprising an assembled joint designed for the circumferential and longitudinal end faces of a corrugated steel plate, the circumferential and longitudinal end faces of a segmented corrugated steel plate component are welded with flanges, which respectively form a longitudinal joint in the longitudinal plane of the tunnel and an annular joint in the cross section of the tunnel, the longitudinal joint is an inserted joint, comprising a male joint and a female joint, and the annular joint is a sliding pin joint, comprising a T-shaped piece and a C-shaped piece.

[0032] The cross section of the annular flange is groove-shaped, and the longitudinal flange is rectangular. The C-shaped piece in the annular pin-type joint is welded with a head plate at one end to prevent the T-shaped piece from slipping out of the C-shaped piece when the corrugated steel plate is assembled. The end of the T-shaped piece is in a large foot shape to avoid force concentration.

[0033] A sliding wedge and a spring are arranged inside the female connector of the longitudinal plug-in connector, so that the male connector inserted therein is locked, and the end of the male connector is in a large foot shape to avoid force concentration.

[0034] Stiffening ribs are arranged at the rear of the flange at the corresponding positions of the circumferential and longitudinal joints to provide reinforcement.

[0035] When assembling the initial support of a new ring of corrugated steel, the corrugated steel plate to be assembled slides into the tunnel longitudinally and is connected to the assembled annular corrugated steel plate through the annular joint. During this process, the longitudinal joint is inserted into the longitudinal corrugated steel plate that has formed a ring to complete the assembly construction of the corrugated steel plate.

[0036] Example

[0037] like Figure 1 As shown, in this example, flanges (2) are welded to the circumferential and longitudinal end faces of a new type of initial tunnel support corrugated steel plate (1), and assembled joints are designed on the flanges of the circumferential and longitudinal end faces, which are respectively longitudinal joints in the longitudinal plane of the tunnel and circumferential joints in the cross section of the tunnel. The longitudinal joint is an insert joint, including a male joint (3) and a female joint (4), and the circumferential joint is a sliding pin joint, including a T-shaped piece (5) and a C-shaped piece (6).

[0038] like Figure 2 As shown, a head plate (7) is provided at one end of the C-shaped member (6) of the annular joint. During the assembly process of the annular joint, the T-shaped member (5) of the annular joint on the adjacent corrugated steel plate placed in the opposite direction slides into the C-shaped member (6) of the annular joint on the corrugated steel plate placed in the forward direction, and the head plate (7) serves to prevent the T-shaped member (5) from sliding out. A sealing gasket (11) is provided inside the C-shaped member (6) to ensure the connection performance after assembly. A stiffening rib (8) is provided at a corresponding position behind the flange plate welded between the T-shaped member (5) and the C-shaped member (6).

[0039] like Figure 3 As shown, the female connector (4) of the longitudinal connector is composed of a sliding wedge (9) and a spring (10) and forms a cavity from outside to inside and from narrow to wide. A stiffening rib (8) is arranged at a corresponding position behind the flange plate welded between the male connector (3) and the female connector (4).

[0040] Figure 4 The figure is a schematic diagram of assembling a longitudinal joint. When assembling the longitudinal joint, the male joint (3) is aligned with the female joint (4). During the insertion process, the male joint (3) presses against the sliding wedge (9), and the sliding wedge (9) then presses the spring (10) inward to form a larger internal space, so that the male joint (3) enters the cavity formed inside the sliding wedge. At the same time, the spring (10) presses the sliding wedge (9) outward to lock the male joint (3).

[0041] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A quick connector for assembling initial support of corrugated steel in a tunnel, used for realizing quick assembly of adjacent corrugated steel plates (1) in the initial support of a tunnel in the longitudinal and circumferential directions, characterized in that: The joint comprises an annular flange welded on the annular end surface of the corrugated steel plate (1), a longitudinal flange welded on the longitudinal end surface, an annular joint arranged on the annular flange, and a longitudinal joint arranged on the longitudinal flange, wherein the annular joint is a sliding pin type joint and the longitudinal joint is an insert type joint; The longitudinal joint comprises a male joint (3) arranged on a longitudinal flange plate on one longitudinal end surface, and a female joint (4) arranged on a longitudinal flange plate on the other longitudinal end surface and inserted and clamped to match the male joint (3) on the adjacent corrugated steel plate (1); The male connector (3) is a cylindrical protrusion that is larger at the front and smaller at the rear, and the female connector (4) is a cylindrical recess that is larger at the bottom and smaller at the mouth, and a spring (10) is provided at the bottom of the recess, and two sliding wedges (9) are provided on the upper part of the spring (10) and are arranged opposite to each other and slide along the side wall of the recess; The opening diameter of the groove of the female connector (4) is larger than the front end diameter of the male connector (3); the distance between the two oppositely disposed sliding wedges (9) is smaller than the diameter of the male connector (3) when the male connector (3) is not inserted; as the male connector (3) is inserted, the spring (10) is compressed inwardly, and the distance between the two oppositely disposed sliding wedges (9) gradually increases; when the male connector (3) is fully inserted, the front end of the male connector (3) is completely embedded between the two oppositely disposed sliding wedges (9); The surface of the annular flange is provided with a first transverse groove portion and a second transverse groove portion in sequence, and the annular joint comprises a T-shaped piece (5) fixed on the first transverse groove portion and a C-shaped piece (6) arranged between the first transverse groove portion and the second transverse groove portion; The T-shaped member (5) is integrally formed with a bottom and a head with a T-shaped cross section, the C-shaped member (6) is an inverted T-shaped groove connecting the first transverse groove portion and the second transverse groove portion, and a head plate (7) is provided at the connection between the C-shaped member (6) and the first transverse groove portion to block the T-shaped member (5) during insertion, the shape of the inverted T-shaped groove matches the shape of the T-shaped head portion, and the width of the inverted T-shaped groove is smaller than the width of the first transverse groove portion and the second transverse groove portion; The distance from the T-shaped piece (5) to the longitudinal end face on one side is equal to the distance from the C-shaped piece (6) to the end face on the other side. During the circumferential splicing, the two circumferentially adjacent corrugated steel plates (1) are plugged in opposite directions until the T-shaped piece (5) is inserted into the C-shaped piece (6) at the corresponding position of the circumferentially adjacent corrugated steel plates (1) and the circumferential plugging is completed after being limited by the head plate (7).

2. A quick connector for initial support assembly of corrugated steel in tunnels according to claim 1, characterized in that: The longitudinal flange is welded with longitudinal stiffening ribs at the rear.

3. The quick connector for initial support assembly of corrugated steel in tunnel according to claim 1, characterized in that: The annular flange is welded with annular stiffening ribs at the rear.

4. The quick connector for initial support assembly of corrugated steel in tunnel according to claim 1, characterized in that: The inner surface of the C-shaped member (6) is also provided with a sealing gasket (11).

Images