Welding-free forepoling assembly fixed through lantern ring

Abstract

The utility model provides a lantern ring fixed welding-free forepoling assembly, which comprises an arch frame, a forepoling small conduit and a lantern ring, the area of the forepoling small conduit close to the tail part is provided with an external thread, the arch frame is provided with a fixing hole, the lantern ring comprises a cylinder part, an expansion head and an annular bulge part, a stop block is arranged on the periphery of the end, away from the cylinder part, of the expansion head, the distance between the stop block and the annular protruding part in the axial direction of the cylinder part is slightly larger than the depth of the fixing hole, internal threads are arranged on the inner wall face of the cylinder part, the expansion head of the lantern ring is inserted into the fixing hole, and the stop block and the annular protruding part clamp and stop the two sides of the fixing hole. And the internal thread of the cylinder part is matched with the external thread of the advanced small conduit so as to fixedly connect the advanced small conduit with the lantern ring. 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 lantern ring clamping and threaded connection, the advanced small guide pipe 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, and particularly relates to a pre-support assembly with a sleeve ring fixation and no welding required. 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 poor geological sections such as soft rock fracture zones and shallow overburden sections. However, in the actual construction of tunnel projects at present, the installation of the pre-small duct is generally carried out by on-site welding on the web of the steel arch. It cannot meet the requirements in some construction environments where open fire operations are prohibited, and the construction time of the welding fixation method is long, the operation is relatively complex, and the construction efficiency is low. Content of the Utility Model

[0003] The purpose of the utility model is to provide a pre-support assembly with a sleeve ring fixation and no welding required according to the deficiencies of the above-mentioned prior art. By changing the connection method between the pre-small duct and the arch from the traditional welding fixation method to a sleeve ring clamping plus threaded connection, the pre-support assembly can be applicable 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 a sleeve ring fixation and no welding required, the pre-support assembly includes an arch, a pre-small duct, and a sleeve ring. An external thread is provided in a region near the tail of the pre-small duct. A fixing hole is opened on the arch. The sleeve ring includes a cylindrical part, an expansion head provided at one end of the cylindrical part, and an annular convex part provided on the outer circumference of the cylindrical part and near the end where the expansion head is located. A blocking block is provided on the outer circumference of the end of the expansion head far from the cylindrical part. The distance between the blocking block and the annular convex part in the axial direction of the cylindrical part is slightly greater than the depth of the fixing hole. An internal thread adapted to the external thread is provided on the inner wall surface of the cylindrical part. The expansion head of the sleeve ring is inserted into the fixing hole, the head of the pre-small duct passes through the expanded expansion head, the blocking block and the annular convex part are clamped and blocked on both sides of the fixing hole, and the internal thread of the cylindrical part is matched with the external thread of the pre-small duct to fixedly connect the pre-small duct and the sleeve ring.

[0006] The expansion head includes a plurality of expansion claws arranged at intervals in the circumferential direction, and each expansion claw is provided with a blocking block at the end far from the cylindrical part.

[0007] The number of the expansion claws is three.

[0008] The advanced small duct is inserted through the expansion head, and the expansion head has a clearance fit with the fixing hole.

[0009] A plurality of the fixing holes are spaced apart in the arc extension direction of the arch frame. A collar is clamped and fixed in each fixing hole, and an advanced small duct is fixedly screwed to each collar.

[0010] A plurality of grouting holes are arranged in a plum blossom shape on the pipe body between the head of the advanced small duct and the external thread.

[0011] 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.

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

[0013] The advantages of the present utility model are as follows: The connection method between the advanced small duct and the arch frame is changed from the traditional welding and fixing method to collar 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

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

[0015] Figure 2 is a schematic structural diagram of the collar in the present utility model;

[0016] Figure 3 is a schematic structural diagram of the advanced small duct in the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The following further details the features of the present utility model and other related features through embodiments in conjunction with the drawings for the understanding of those skilled in the same industry:

[0018] 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, grouting hole 22, collar 30, cylindrical part 31, expansion head 32, expansion claw 321, blocking block 322, annular protrusion part 33, internal thread 34.

[0019] Embodiment: As Figures 1-3As shown in the figure, this embodiment relates to a pre - support assembly with collar fixation for pre - support in tunnel construction. The pre - support assembly includes an arch frame 10, a pre - advanced small duct 20, and a collar 30. An external thread 21 is provided in a region near the tail of the pre - advanced small duct 20, and a fixing hole 11 is formed on the arch frame 10. The collar 30 includes a cylindrical part 31, an expansion head 32 provided at one end of the cylindrical part 31, and an annular protrusion 33 provided on the outer circumference of the cylindrical part 31 and near the end where the expansion head 32 is located. Among them, the cylindrical part 31 is in the shape of a hollow cylinder. One end of the expansion head 32 away from the cylindrical part 31 can expand outward under the action of an external force. A blocking block 322 is provided on the outer circumference of the end of the expansion head 32 away from the cylindrical part 31. After the expansion head 32 expands, the distance between the blocking block 322 and the annular protrusion 33 in the axial direction of the cylindrical part 31 is slightly greater than the depth of the fixing hole 11, so as to ensure that the blocking block 322 and the annular protrusion 33 can be clamped and blocked on both sides of the fixing hole 11 and fit tightly with both sides of the fixing hole 11, preventing the axial movement range from being too large and resulting in insecure fixation. An internal thread 34 adapted to the external thread 21 on the pre - advanced small duct 20 is provided on the inner wall surface of the cylindrical part 31. In the fixed state, the expansion head 32 of the collar 30 is inserted into the fixing hole 11 on the arch frame 10 and expands. At this time, the blocking block 322 and the annular protrusion 33 are clamped and blocked on both sides of the fixing hole 11, realizing the clamping fixation between the collar 30 and the arch frame 10. The head of the pre - advanced small duct 20 passes through the expanded expansion head 32, and the internal thread 34 of the cylindrical part 31 is engaged with the external thread 21 of the pre - advanced small duct 20 to fixedly connect the pre - advanced small duct 20 and the collar 30, thereby realizing the fixed connection between the pre - advanced small duct 20 and the arch frame 10.

[0020] That is to say, when it is necessary to fix the pre - advanced small duct 20 to the arch frame 10, first insert the expansion head 32 of the collar 30 into the fixing hole 11 of the arch frame 10, and then drive a steel bar with a diameter smaller than the inner diameter of the collar 30 into the collar 30, so that the steel bar passes through the expansion head 32 and causes the pre - opened expansion head 32 to expand. At this time, the blocking block 322 and the annular protrusion 33 are clamped and blocked on both sides of the fixing hole 11, realizing the clamping fixation between the collar 30 and the arch frame 10. Then, pull out the steel bar, insert the head of the pre - advanced small duct 20 into the cylindrical part 31 of the collar 30, and then continuously push it in until it passes through the expansion head 32. Until the external thread 21 of the pre - advanced small duct 20 is close to the cylindrical part 31. Finally, rotate the pre - advanced small duct 20 so that the internal thread 34 on the inner wall of the cylindrical part 31 is engaged with the external thread 21 of the pre - advanced small duct 20 for fixation. At this time, the pre - advanced small duct 20 and the collar 30 are fixedly connected, and finally the pre - advanced small duct 20 is fixed to the arch frame 10.

[0021] In this embodiment, the cylindrical part 31, the expansion head 32, the annular protrusion 33, etc. of the collar 30 are integrally formed structures, and the collar 30 can be made of steel materials.

[0022] In this embodiment, the advanced small duct 20 is inserted through the expansion head 32, and the expansion head 32 is in clearance fit with the fixing hole 11. Specifically, the part of the expansion head 32 located between the blocking block 322 and the annular protrusion 33 is in clearance fit with the fixing hole 11. Thus, it is ensured that after the expansion head 32 is enlarged with a steel drill and the advanced small duct 20 is inserted, the collar 30 can be firmly clamped by the outer wall of the advanced small duct 20 and the inner wall of the fixing hole 11, avoiding shaking, thereby improving the firmness of the formed advanced support assembly.

[0023] In this embodiment, the expansion head 32 includes a plurality of expansion claws 321 arranged at circumferential intervals, and a blocking block 322 is provided at one end of each expansion claw 321 away from the cylindrical part 31. Exemplarily, the expansion head 32 is in the shape of a bullet head with a middle recessed circle, and has a plurality of expansion claws 321 at the head, and there are slits / gaps between the plurality of expansion claws 321. By providing a blocking block 322 on the outer surface of one end of each expansion claw 321 away from the cylindrical part 31, after the expansion claw 321 is stressed and expanded, the blocking block 322 at its end can axially hinder the movement of the collar 30. In some embodiments, the number of expansion claws 321 is three.

[0024] In one embodiment, the arch 10 is provided with a plurality of fixing holes 11 at intervals in the arc extension direction, and a collar 30 is clamped and fixed in each fixing hole 11, and an advanced small duct 20 is threadedly fixed in each collar 30. That is to say, the arch 10 in this embodiment is in an arch shape, or an arc shape, and in its arc extension direction, a plurality of fixing holes 11 for fixing the collar 30 and the advanced small duct 20 are provided at intervals to achieve effective advanced support for the periphery of the tunnel construction area. Among them, the diameter of the fixing hole 11 is adapted to the part of the expanded expansion head 32 located between the blocking block 322 and the annular protrusion 33.

[0025] In one embodiment, a plurality of grouting holes 22 are provided in the pipe body area between the head and the external thread 21 of the advanced small duct 20. The advanced small duct 20 is in a hollow tubular shape, and the grouting holes 22 communicate with the inside of the advanced small duct 20. Then, when high-pressure grouting is carried out into the pipe of the advanced small duct 20, the slurry will be pressed out from the grouting holes 22 to the soil outside the advanced small duct 20, and after solidification, the grouting body and the advanced small duct 20 can form a firm support structure. Optionally, the plurality of grouting holes 22 in this embodiment are arranged in a plum blossom shape.

[0026] 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 hole 11 is opened on the web 13. Then, the depth of the fixing hole 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 capacity.

[0027] In summary, the beneficial effects of the present utility model 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 plus threaded connection after the expansion head on the collar is expanded, the advanced support assembly can be applied to the construction environment where open flame operations are prohibited, and has a simple structure, convenient installation, reduces the construction difficulty, speeds up the construction efficiency, and reduces the cost.

[0028] 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 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 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 that there is at least one. The terms such as "connected" or "coupled" 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 indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship also changes accordingly.

[0029] The above is the preferred embodiment of the present utility model. 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 utility model, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model.

Claims

1. A welding-free advanced support assembly fixed by a collar, characterized in that: The advance support assembly includes an arch frame, an advance small catheter and a collar, the advance small catheter is provided with an external thread in the area near the tail, the arch frame is provided with a fixing hole, the collar includes a cylindrical portion, an expansion head arranged at one end of the cylindrical portion, and an annular protrusion arranged at the outer periphery of the cylindrical portion and close to the end where the expansion head is located, a blocking block is provided at the outer periphery of the end of the expansion head away from the cylindrical portion, the axial distance between the blocking block and the annular protrusion of the cylindrical portion is greater than the depth of the fixing hole, the inner wall surface of the cylindrical portion is provided with an internal thread matched with the external thread, the expansion head of the collar is inserted into the fixing hole, the head of the advance small catheter passes through the expanded expansion head, the blocking block and the annular protrusion clamp and block the two sides of the fixing hole, the internal thread of the cylindrical portion cooperates with the external thread of the advance small catheter to fix the advance small catheter to the collar.

2. The advanced support assembly according to claim 1, characterized in that: The expansion head comprises a plurality of expansion claws spaced apart in the circumferential direction, and a blocking block is disposed at one end of each expansion claw away from the cylindrical portion.

3. The advanced support assembly according to claim 2, characterized in that: The number of the expansion claws is three.

4. The advanced support assembly according to claim 1, characterized in that: The advanced small catheter is passed through the expansion head, and the expansion head and the fixing hole are in clearance fit.

5. 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, a collar is clamped and fixed in each fixing hole, and each collar is threadedly fixed with a small leading guide tube.

6. 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 external thread.

7. 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.

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

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