Welding-free advance support assembly for tunnel support

Abstract

The utility model provides a welding-free forepoling component for tunnel support, which comprises an arch frame, a forepoling small conduit and a sleeve, the arch frame is provided with a fixing hole, the area of the forepoling small conduit close to the tail part is provided with an external thread, the periphery of the forepoling small conduit is also provided with a circular truncated cone-shaped bulge, and the forepoling small conduit is provided with an external thread. The sleeve comprises an abutting portion and an expansion head arranged at one end of the abutting portion, the abutting portion is provided with a threaded hole allowing the advanced small catheter to penetrate through, the expansion head of the sleeve is inserted into the fixing hole, and the head of the advanced small catheter penetrates through the expansion head. The expansion head is opened by the circular-truncated-cone-shaped protrusion so that the external expansion part of the expansion head and the abutting part can be clamped and fixed to the two sides of the fixing hole respectively, and the advanced small catheter is fixedly connected with the threaded hole of the abutting part through the external thread. The utility model has the advantages that the connection mode of the advanced small guide pipe and the arch frame is changed from the traditional welding fixing mode to the sleeve clamping and threaded connection mode, the device can be suitable for the construction environment in which open fire operation is forbidden, the structure is simple and convenient, and the installation is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel support construction, in particular to a welding-free advanced support component for tunnel support. Background Art

[0002] Small pipe grouting is a common form of advance support in tunnel construction. It plays an important role in improving the stability of surrounding rock when the tunnel passes through poor geological sections such as soft rock fracture zones and shallow overburden sections. However, in the actual construction of tunnel projects, the installation of small advance pipes is generally installed on the web of the steel arch frame by on-site welding, which cannot meet the requirements in some construction environments where open flames are prohibited. In addition, the welding fixation method takes a long time to construct, is complicated to operate, and has low construction efficiency. Utility Model Content

[0003] The purpose of the utility model is to provide a welding-free advance support assembly for tunnel support in accordance with the above-mentioned deficiencies of the prior art, by changing the connection method between the advance small guide tube and the arch frame from the traditional welding fixing method to the sleeve clamping and threaded connection, so that the advance support assembly can be suitable for construction environments where open flame operations are prohibited, and the structure is simple and easy to install, which reduces the construction difficulty, speeds up the construction efficiency and reduces the cost.

[0004] The purpose of this utility model is achieved by the following technical solutions:

[0005] A welding-free advance support assembly for tunnel support, the advance support assembly comprising an arch frame, an advance small conduit and a sleeve, the arch frame is provided with a fixing hole, the advance small conduit is provided with an external thread in the area near the tail, the outer periphery of the advance small conduit is also formed with a truncated cone-shaped protrusion, the truncated cone-shaped protrusion is located on the side of the external thread away from the tail of the advance small conduit, and the diameter of the truncated cone-shaped protrusion gradually increases along the axial direction of the advance small conduit and away from the external thread, the sleeve comprises a supporting portion and an expansion head provided at one end of the supporting portion The supporting portion is provided with a threaded hole for the advance small catheter to pass through and cooperate with the external thread. The cross-sectional size of the supporting portion is larger than the diameter of the fixing hole. The outer diameter of the expansion head is smaller than the diameter of the fixing hole. The expansion head of the sleeve is inserted into the fixing hole. The head of the advance small catheter passes through the expansion head of the sleeve, and the truncated cone-shaped protrusion props up the expansion head so that the outward expansion part of the expansion head and the supporting portion are respectively clamped and fixed on both sides of the fixing hole. The advance small catheter is fixedly connected to the threaded hole of the supporting portion through the external thread.

[0006] The expansion head comprises a cylindrical portion, and a plurality of expansion slits are circumferentially spaced apart at one end of the cylindrical portion away from the abutting portion.

[0007] The outer shape of the abutting part is a hexagonal prism.

[0008] A plurality of the fixing holes are spaced apart in the arc extension direction of the arch frame, a sleeve is fixed in each fixing hole, and an advanced small duct is fixed in each sleeve.

[0009] A plurality of grouting holes arranged in a plum blossom shape are formed in the pipe body between the head of the advanced small duct and the frustum-shaped protrusion.

[0010] The arch frame includes two arc-shaped plates and a web plate clamped between the two arc-shaped plates, and the arc-shaped plates and the web plate are integrally formed.

[0011] The arch frame is made of section steel.

[0012] The advantages of the present invention are: changing the connection method between the advanced small duct and the arch frame from the traditional welding and fixing method to sleeve clamping plus threaded connection, so that the advanced support assembly can be applicable to the construction environment where open fire operations are prohibited, and the structure is simple, the installation is convenient, the construction difficulty is reduced, the construction efficiency is accelerated, and the cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of the advanced support assembly in the present invention;

[0014] Figure 2 is a schematic structural diagram of the advanced small duct and the sleeve before being assembled in the present invention;

[0015] Figure 3 is a schematic structural diagram of the advanced small duct and the sleeve when being assembled in the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The features of the present invention and other related features will be further described in detail below with reference to the accompanying drawings through embodiments for the understanding of those skilled in the same industry:

[0017] As Figures 1-3 shown, the marks in the figure are respectively represented as: arch frame 10, fixing hole 11, arc-shaped plate 12, web plate 13, advanced small duct 20, external thread 21, frustum-shaped protrusion 22, grouting hole 23, sleeve 30, abutting part 31, expansion head 32, threaded hole 33.

[0018] Embodiment: As Figures 1-3As shown in the figure, this embodiment relates to a non-welded advanced support assembly for tunnel support, that is, an advanced support for tunnel construction. The advanced support assembly includes an arch frame 10, an advanced small duct 20, and a sleeve 30. A fixing hole 11 is formed in the arch frame 10. An external thread 21 is provided in the area near the tail of the advanced small duct 20. A frustum-shaped protrusion 22 is also formed on the outer periphery of the advanced small duct 20. The frustum-shaped protrusion 22 is located on the side of the external thread 21 away from the tail of the advanced small duct 20. Moreover, the diameter of the frustum-shaped protrusion 22 gradually increases in the direction along the axis of the advanced small duct 20 and away from the external thread 21. The maximum outer diameter of the frustum-shaped protrusion 22 is slightly smaller than the diameter of the fixing hole 11 to ensure that the part of the advanced small duct 20 with the frustum-shaped protrusion 22 can also pass through the fixing hole 11.

[0019] In this embodiment, the sleeve 30 includes a holding part 31 and an expansion head 32 provided at one end of the holding part 31. Among them, the holding part 31 and the expansion head 32 can be integrally formed. Optionally, the sleeve 30 can be made of steel material. The holding part 31 is provided with a threaded hole 33 for the advanced small duct 20 to pass through and cooperate with the external thread 21. That is to say, a threaded hole 33 penetrating through both ends is formed in the holding part 31. The diameter of the threaded hole 33 is larger than the outer diameter of the tail of the advanced small duct 20 to ensure that the sleeve 30 can be sleeved outside the tail of the advanced small duct 20, and an internal thread adapted to the external thread 21 on the advanced small duct 20 is formed in the threaded hole 33. Moreover, the cross-sectional dimension of the holding part 31 is larger than the diameter of the fixing hole 11, so that the holding part 31 cannot pass through the fixing hole 11 and is blocked on one side of the fixing hole 11. The outer diameter of the expansion head 32 is slightly smaller than the diameter of the fixing hole 11 to ensure that the expansion head 32 can be inserted into the fixing hole 11, and the end of the expansion head 32 away from the holding part 31 can expand outwards under the action of an external force.

[0020] In the fixed state, the head of the advanced small duct 20 passes through the fixing hole 11 on the arch frame 10, and until the frustum-shaped protrusion 22 provided on the outer periphery of the advanced small duct 20 also passes through the fixing hole 11. The sleeve 30 is sleeved on the tail of the advanced small duct 20, and the expansion head 32 of the sleeve 30 is inserted into the fixing hole 11, so that the expansion head 32 is located between the advanced small duct 20 and the fixing hole 11. Further, the frustum-shaped protrusion 22 expands the expansion head 32 outwards, so that the outer-expanded part dimension of the expansion head 32 is larger than the diameter of the fixing hole 11, so that the outer-expanded part of the expansion head 32 and the holding part 31 of the sleeve 30 are respectively clamped and fixed on both sides of the fixing hole 11, and the advanced small duct 20 is fixedly connected to the holding part 31 of the sleeve 30 through the external thread 21, finally realizing the fixed connection between the advanced small duct 20 and the arch frame 10.

[0021] That is to say, when the leading small duct 20 needs to be fixed to the arch support 10, first insert the leading small duct 20 into the fixing hole 11 of the arch support 10 from the head, and then continuously push it inward so that the frustum-shaped protrusion 22 also passes through the fixing hole 11 until the external thread 21 of the leading small duct 20 is close to the fixing hole 11; afterwards, sleeved the sleeve 30 on the tail of the leading small duct 20, and then continue to push in the direction where the frustum-shaped protrusion 22 is located, so that the expansion head 32 of the sleeve 30 is inserted into the fixing hole 11 of the arch support 10. Optionally, a part of the expansion head 32 can extend out of the other side of the fixing hole 11. Then the sleeve 30 continues to rotate forward, so that the expansion head 32 is expanded outward by the frustum-shaped protrusion 22 on the leading small duct 20, and the threaded hole 33 in the abutting portion 31 is threadedly engaged with the external thread 21 on the leading small duct 20 to achieve a fixed connection. At this time, the expanded part of the expansion head 32 and the abutting portion 31 of the sleeve 30 are respectively clamped on both sides of the fixing hole 11, thereby realizing the installation and fixation of the leading small duct 20 on the arch support 10.

[0022] In this embodiment, the expansion head 32 includes a cylindrical portion, and a plurality of expansion slits are circumferentially spaced apart at one end of the cylindrical portion away from the abutting portion 31. Thus, when the frustum-shaped protrusion 22 continuously advances in the cylindrical portion, the expansion head 32 will be expanded outward.

[0023] In this embodiment, the outer shape of the abutting portion 31 is a hexagonal prism. That is to say, a threaded hole 33 is provided inside the abutting portion 31, and the outside is in the shape of a hexagonal prism, which is convenient for using a wrench to rotate and tighten the sleeve 30.

[0024] In this embodiment, the leading small duct 20 is inserted into the expansion head 32. Optionally, the expansion head 32 and the fixing hole 11 are in an interference fit. Specifically, the frustum-shaped protrusion 22 on the leading small duct 20 is used to expand the expansion head 32, so that the expansion head 32 is clamped between the frustum-shaped protrusion 22 and the inner wall of the fixing hole 11. Thus, it is ensured that the leading small duct 20 cannot move radially and avoid shaking, thereby improving the firmness of the formed leading support assembly.

[0025] In one embodiment, a plurality of fixing holes 11 are spaced apart along the arc extension direction of the arch support 10, and a sleeve 30 and a leading small duct 20 are clamped and fixed in each fixing hole 11. That is to say, the arch support 10 in this embodiment is in an arch shape, or called an arc shape. Along its arc extension direction, a plurality of fixing holes 11 for fixing the sleeve 30 and the leading small duct 20 are spaced apart to achieve effective leading support for the periphery of the tunnel construction area.

[0026] In one embodiment, a plurality of grouting holes 23 are formed in the pipe body area between the head of the advanced small duct 20 and the frustum-shaped protrusion 22. The advanced small duct 20 is in a hollow tubular shape, and the grouting holes 23 communicate with the inside of the advanced small duct 20. When high-pressure grouting is carried out into the pipe of the advanced small duct 20, the grout will be pressed out from the grouting holes 23 to the soil outside the advanced small duct 20. After solidification, the grouting body and the advanced small duct 20 can form a firm support structure. Optionally, the plurality of grouting holes 23 in this embodiment are arranged in a plum blossom shape.

[0027] In this embodiment, the arch frame 10 includes two arc-shaped plates 12 and a web 13 clamped between the two arc-shaped plates 12. The arc-shaped plates 12 and the web 13 are integrally formed, and the fixing holes 11 are formed in the web 13. Then the depth of the fixing holes 11 is the thickness of the web 13. In some embodiments, the arch frame 10 is made of section steel. The arch frame 10 made of section steel has high strength and strong support ability.

[0028] In summary, the beneficial effects of the present invention are as follows: By changing the connection method between the advanced small duct and the arch frame from the traditional welding and fixing method to the clamping and fixing of the expansion head on the sleeve after expansion and the fixing hole, and the threaded fixing connection method between the sleeve and the advanced small duct, the advanced support assembly can be applied to the construction environment where open fire operations are prohibited, and has a simple structure, convenient installation, reduces the construction difficulty, speeds up the construction efficiency, and reduces the cost.

[0029] Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings understood by those of ordinary skill in the art to which the present invention belongs. The "first", "second" and similar terms used in the specification and claims of the patent application of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, the terms such as "a" or "one" do not indicate a quantity limitation, but indicate the existence of at least one. The terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left" and "right" are only used to represent relative position relationships. When the absolute position of the object to be described changes, the relative position relationship also changes accordingly.

[0030] The above is the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art in the technical field, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A welding-free advance support assembly for tunnel support, characterized in that: The advance support assembly includes an arch frame, an advance small catheter and a sleeve, the arch frame is provided with a fixing hole, the area of ​​the advance small catheter near the tail is provided with an external thread, the outer periphery of the advance small catheter is also formed with a truncated cone-shaped protrusion, the truncated cone-shaped protrusion is located on the side of the external thread away from the tail of the advance small catheter, and the diameter of the truncated cone-shaped protrusion gradually increases along the axial direction of the advance small catheter and away from the external thread, the sleeve includes a supporting portion and an expansion head provided at one end of the supporting portion, the supporting portion is provided with a The advance small catheter passes through the threaded hole that cooperates with the external thread, the cross-sectional size of the supporting portion is larger than the diameter of the fixing hole, the outer diameter of the expansion head is smaller than the diameter of the fixing hole, the expansion head of the sleeve is inserted into the fixing hole, the head of the advance small catheter passes through the expansion head of the sleeve, and the truncated cone-shaped protrusion props up the expansion head so that the outward expansion part of the expansion head and the supporting portion are respectively clamped and fixed on both sides of the fixing hole, and the advance small catheter is fixedly connected to the threaded hole of the supporting portion through the external thread.

2. The advanced support assembly according to claim 1, characterized in that: The expansion head comprises a cylindrical portion, and a plurality of expansion slits are circumferentially spaced apart at one end of the cylindrical portion away from the abutting portion.

3. The advanced support assembly according to claim 1, characterized in that: The supporting portion has a hexagonal shape.

4. The advanced support assembly according to claim 1, characterized in that: The arch frame is provided with a plurality of fixing holes spaced apart in the direction of arc extension, a sleeve is fixed in each fixing hole, and an advance small guide tube is fixed in each sleeve.

5. The advanced support assembly according to claim 1, characterized in that: A plurality of grouting holes arranged in a plum blossom shape are provided on the tube body between the head of the small leading guide tube and the truncated cone-shaped protrusion.

6. The advanced support assembly according to claim 1, characterized in that: The arch frame includes two arc-shaped plates and a web plate sandwiched between the two arc-shaped plates, and the arc-shaped plate and the web plate are integrally formed.

7. The advanced support assembly according to claim 1, characterized in that: The arch frame is made of steel.

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