Clamping and fixing welding-free forepoling assembly

Abstract

The utility model provides a clamping fixed welding-free forepoling assembly, the forepoling assembly comprises an arch frame, a forepoling small conduit and a fixing ring, the area of the forepoling small conduit close to the tail part is provided with an external thread, the periphery is provided with a rib plate, the rib plate is located at one side of the external thread far away from the tail part of the forepoling small conduit, the arch frame is provided with a fixing hole, and the fixing ring is provided with a fixing hole. The shape of the fixing hole is matched with the shape of the portion, provided with the rib plate, of the advanced small catheter, the tail of the advanced small catheter is sleeved with the fixing ring, internal threads matched with the external threads are formed in the inner wall of the fixing ring, and the portion, provided with the rib plate, of the advanced small catheter penetrates through the fixing hole and rotates by a preset angle. The internal thread of the fixing ring is matched with the external thread of the advanced small guide pipe so that the advanced small guide pipe can be fixed to the arch frame. 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 clamping and threaded connection mode, and the advanced small guide pipe is suitable for the construction environment in which open fire operation is forbidden, and is simple and convenient in structure and convenient to install.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel support construction, and particularly relates to a pre - support assembly with clamping and fixing and without welding. Background Art

[0002] The small - duct grouting is a commonly used pre - support form in tunnel construction, and it plays an important role in improving the stability of surrounding rocks when the tunnel passes through soft - rock fracture zones, shallow - overburden sections and other poor geological sections. However, in the actual construction of tunnel engineering at present, the installation of the pre - support small ducts is generally carried out by on - site welding on the webs of the steel arch frames, which cannot meet the requirements in some construction environments where open - fire operations are prohibited. Moreover, the construction method of welding and fixing has a long construction time, is relatively complex in operation, and has low construction efficiency. Content of the Utility Model

[0003] The purpose of the utility model is to provide a pre - support assembly with clamping and fixing and without welding according to the deficiencies of the above - mentioned prior art. By changing the connection method between the pre - support small duct and the arch frame from the traditional welding and fixing method to clamping and threaded connection, the pre - support assembly can be applied to construction environments 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.

[0004] The realization of the purpose of the utility model is completed by the following technical solutions:

[0005] A pre - support assembly with clamping and fixing and without welding, characterized in that the pre - support assembly includes an arch frame, a pre - support small duct and a fixing ring. An external thread is provided in a region near the tail of the pre - support small duct. At least two raised rib plates are further provided on the outer periphery of the pre - support small duct. The rib plates are located on a side of the external thread away from the tail of the pre - support small duct. A fixing hole is provided on the arch frame, and the shape of the fixing hole is adapted to the outer shape of the part of the pre - support small duct with rib plates. The fixing ring is sleeved on the tail of the pre - support small duct, and an internal thread adapted to the external thread is provided on the inner wall of the fixing ring. The part of the pre - support small duct with rib plates passes through the fixing hole and rotates a preset angle, and the internal thread of the fixing ring cooperates with the external thread of the pre - support small duct to fix the pre - support small duct on the arch frame.

[0006] The number of the rib plates is two, and the two rib plates are symmetrically arranged on the outer peripheral surface of the pre - support small duct.

[0007] A guiding inclined surface is provided at one end of the rib plate away from the external thread, and the distance from the guiding inclined surface to the outer periphery of the pre - support small duct gradually decreases in the direction away from the external thread.

[0008] The arch support is provided with a plurality of the fixing holes at intervals along the arc extension direction, and a leading small duct is fixed in each fixing hole.

[0009] At least two convex portions are arranged on the outer periphery of the fixing ring.

[0010] A plurality of grouting holes are formed in the area between the head of the leading small duct and the rib plate.

[0011] The plurality of grouting holes are arranged in a plum blossom shape.

[0012] The arch support is made of section steel.

[0013] The advantages of the present utility model are as follows: The connection mode between the leading small duct and the arch support is changed from the traditional welding and fixing mode to clamping and threaded connection, so that the leading support assembly can be applied 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. Description of the Drawings

[0014] Figure 1 is a schematic structural view of the leading support assembly in the present utility model;

[0015] Figure 2 is a schematic structural view of the leading small duct and the fixing ring before assembly in the present utility model;

[0016] Figure 3 is a schematic structural view of the leading small duct and the fixing ring after assembly in the present utility model;

[0017] Figure 4 is a schematic structural view of the arch support in the present utility model. Detailed Embodiment

[0018] The features of the present utility model and other related features are further described in detail below with reference to the drawings through embodiments for the understanding of those skilled in the same industry:

[0019] As Figures 1-4 shown, the marks in the figure are respectively represented as: arch support 10, fixing hole 11, leading small duct 20, external thread 21, rib plate 22, guiding inclined surface 221, grouting hole 23, fixing ring 30, convex portion 31, internal thread 32.

[0020] Embodiment: As Figures 1-4As shown in the figure, this embodiment relates to a clamping and fixing non-welded advanced support assembly for advanced support in tunnel construction. The advanced support assembly includes an arch frame 10, an advanced small duct 20, and a fixing ring 30. Among them, an external thread 21 is provided in the area near the tail of the advanced small duct 20, and at least two raised rib plates 22 are further provided on the outer periphery of the advanced small duct 20. These rib plates 22 are located on the side of the external thread 21 away from the tail of the advanced small duct 20. A fixing hole 11 is provided on the arch frame 10, and the shape of the fixing hole 11 is adapted to the outer shape of the part of the advanced small duct 20 with rib plates 22, that is to say, the fixing hole 11 is a combination of a circular hole and a strip-shaped hole. The fixing ring 30 is sleeved on the tail of the advanced small duct 20, and the inner diameter of the fixing ring 30 is slightly larger than the outer diameter of the tail of the advanced small duct 20 to ensure that the fixing ring 30 can be sleeved on the outer periphery of the tail of the advanced small duct 20, and an internal thread 32 adapted to the external thread 21 provided on the outer periphery of the advanced small duct 20 is provided on the inner wall of the fixing ring 30.

[0021] Therefore, when it is necessary to fix the advanced small duct 20 to the arch frame 10, the advanced small duct 20 is inserted into the fixing hole 11 of the arch frame 10 from the head, and then continuously pushed inward until the part of the advanced small duct 20 with rib plates 22 passes through the fixing hole 11. After that, the advanced small duct 20 is rotated by a preset angle so that the rib plates 22 on the advanced small duct 20 interfere with the arch frame 10 in the axial direction of the advanced small duct 20 and cannot move outward. Finally, the fixing ring 30 is sleeved on the tail of the advanced small duct 20 and close to the external thread 21, and is rotated and installed along the external thread 21 so that the internal thread 32 of the fixing ring 30 cooperates with the external thread 21 of the advanced small duct 20 for fixation. At this time, both the inner and outer sides of the arch frame 10 are clamped by the rib plates 22 of the advanced small duct 20 and the fixing ring 30 sleeved on the outer periphery of the advanced small duct 20, and finally the advanced small duct 20 is fixed to the arch frame 10.

[0022] In this embodiment, the number of rib plates 22 is two, and the two rib plates 22 are symmetrically arranged on the outer peripheral surface of the advanced small duct 20. In this way, not only can symmetric abutting force be provided, but also it is easy to align when inserting the advanced small duct 20, which is convenient for construction.

[0023] In this embodiment, a guiding inclined surface 221 is provided at one end of the rib plate 22 away from the external thread 21, and the distance from the guiding inclined surface 221 to the outer periphery of the advanced small duct 20 gradually decreases in the direction away from the external thread 21. That is to say, the rib plate 22 is generally in the shape of a right trapezoid, and the hypotenuse of the trapezoid is located on the side of the rib plate 22 close to the head of the advanced small duct 20. Therefore, when the advanced small duct 20 is inserted into the fixing hole 11 of the arch frame 10, the guiding inclined surface 221 is used to guide the insertion of the advanced small duct 20, which can improve the insertion speed and thus improve the construction efficiency.

[0024] In one embodiment, the arch support 10 is provided with a plurality of fixing holes 11 at intervals along the arc extension direction, and a small pre - advance pipe 20 is fixed in each fixing hole 11. That is to say, the arch support 10 in this embodiment is in an arch shape, or an arc shape, and a plurality of fixing holes 11 for fixing the small pre - advance pipe 20 are provided at intervals along its arc extension direction to achieve effective pre - support for the periphery of the tunnel construction area.

[0025] In this embodiment, at least two convex portions 31 are provided on the outer periphery of the fixing ring 30. By providing the convex portions 31 on the outer periphery of the fixing ring 30, the circumferential frictional resistance of the fixing ring 30 can be increased, thus facilitating the construction workers to tighten the fixing ring 30.

[0026] In one embodiment, a plurality of grouting holes 23 are provided in the area between the head of the small pre - advance pipe 20 and the rib plate 22. The small pre - advance pipe 20 is in a hollow tubular shape, and the grouting holes 23 communicate with the inside of the small pre - advance pipe 20. When high - pressure grouting is carried out into the pipe of the small pre - advance pipe 20, the grout will be pressed out from the grouting holes 23 to the soil outside the small pre - advance pipe 20. After solidification, the grouting body and the small pre - advance pipe 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 support 10 is made of section steel. The arch support 10 made of section steel has high strength and strong support ability.

[0028] In summary, the beneficial effects of the present utility model are as follows: By changing the connection method between the small pre - advance pipe and the arch support from the traditional welding and fixing method to clamping plus threaded connection, the pre - 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 field to which the present utility model belongs. The "first", "second" and similar terms used in the description and claims of the patent application of the present utility model do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, the terms such as "a" or "one" do not denote a quantity limitation, but mean that there is 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 being described changes, the relative position relationship also changes accordingly.

[0030] The above are the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims

1. A clamping and fixed welding-free advance support assembly, characterized in that: The advance support assembly includes an arch frame, an advance small catheter and a fixing ring. 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 provided with at least two raised ribs, and the ribs are located on the side of the external thread away from the tail of the advance small catheter. A fixing hole is provided on the arch frame, and the shape of the fixing hole is adapted to the outer shape of the portion of the advance small catheter with the ribs. The fixing ring is sleeved on the tail of the advance small catheter, and the inner wall of the fixing ring is provided with an internal thread adapted to the external thread. The portion of the advance small catheter with the ribs passes through the fixing hole and is rotated at a preset angle. The internal thread of the fixing ring cooperates with the external thread of the advance small catheter to fix the advance small catheter on the arch frame.

2. The advanced support assembly according to claim 1, characterized in that: The number of the ribs is two, and the two ribs are symmetrically arranged on the outer peripheral surface of the leading small conduit.

3. The advanced support assembly according to claim 1, characterized in that: A guiding slope is arranged at one end of the rib away from the external thread, and the distance from the guiding slope to the outer periphery of the leading small conduit gradually decreases in the direction away from the external thread.

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 along the arc extension direction, and one of the leading small guide tubes is fixed in each of the fixing holes.

5. The advanced support assembly according to claim 1, characterized in that: At least two protrusions are arranged on the outer circumference of the fixing ring.

6. The advanced support assembly according to claim 1, characterized in that: A plurality of grouting holes are provided in the area between the head of the small leading guide tube and the rib plate.

7. The advanced support assembly according to claim 6, characterized in that: The plurality of grouting holes are arranged in a plum blossom shape.

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

Images