Sandy soil pipe jacking anti-drag slurry sleeve forming device

Abstract

The utility model relates to the technical field of building construction, and particularly discloses a sandy soil jacking pipe anti-drag slurry sleeve forming device which comprises a tool head abutting against the end of a jacking pipe and a lantern ring fixedly connected to the end, facing the jacking pipe, of the tool head and wrapping the end of the jacking pipe. The grouting channel extends from the end of the jacking pipe to the tail end of the lantern ring in an arc shape, an arc-shaped opening faces inwards, a corrugated section is further formed on the inner wall of the grouting channel, and the problem that when a traditional jacking pipe is constructed in sandy soil, due to the fact that the sandy soil is unstable, a gap between the jacking pipe and the soil body in the advancing process is filled with the sandy soil, and the construction efficiency is improved is solved. And the formation of a slurry sleeve is prevented.

Description

Technical Field

[0001] The present application relates to the technical field of building construction, and specifically discloses a device for forming a drag-reducing mud sleeve for a sandy soil jacking pipe. Background Art

[0002] Pipe jacking construction is a commonly used underground trenchless pipe laying technology. The friction between the pipe and the soil is relatively large, resulting in a large back-support force required for the working well, or even no support force can be provided, causing construction difficulties. Therefore, grouting to reduce drag is a very important step in pipe jacking construction.

[0003] During the pipe jacking construction process, if the injected drag-reducing mud can form a relatively complete drag-reducing mud sleeve on the outer periphery of the pipeline, it can increase the drag reduction effect and support effect, increase the single-stage attack length, reduce the interruption amount, increase the distance between the working well and the receiving well, and reduce the project cost.

[0004] When existing pipe jacking grouting systems are used in non-sandy soils, due to the soil's inherently strong arching effect, a gap can form between the pipe and the soil as the tool head advances, allowing grouting to form a relatively complete slurry jacket. However, in sandy soils, due to the inherent instability of the sandy soil, the gap between the pipe and the soil will be filled with sand as the tool head advances, preventing the formation of a slurry jacket.

[0005] Therefore, in view of this, the inventor provides a device for forming a drag-reducing mud jacket for a sandy soil pipe jacking to solve the above-mentioned problem. Utility Model Content

[0006] The utility model aims to solve the problem that when traditional jacking pipes are constructed in sandy soil, the sandy soil itself is unstable, and the gap between the jacking pipe and the soil will be filled with sandy soil during the movement, thereby blocking the formation of a mud jacket.

[0007] In order to achieve the above-mentioned purpose, the basic scheme of the present invention provides a sandy soil jacking pipe drag reduction mud sleeve forming device, including a tool head that abuts against the end of the jacking pipe, and a ring fixed to the tool head facing one end of the jacking pipe and wrapping the end of the jacking pipe. A grouting channel is opened on the inner side of the ring for exposing the mud grouting hole. The grouting channel extends in an arc shape from the end of the jacking pipe to the end of the ring, and the arc opening is inward. A corrugated section is also formed on the inner wall of the grouting channel.

[0008] Furthermore, as the corrugated section extends toward the end of the collar, the radius of the corrugation gradually increases.

[0009] Furthermore, the starting end of the corrugated section is located outside the mud grouting hole, and the inwardly concave corrugations are aligned with the mud grouting hole.

[0010] Furthermore, a plurality of vibrating cones are circumferentially fixed to the inner wall of the grouting channel located behind the corrugated section.

[0011] Furthermore, the end portion of the vibrating cone is flush with the end portion of the collar.

[0012] Furthermore, a guide ring sleeve is fixedly connected to the end of the collar, and the inner diameter of the guide ring sleeve is equal to the inner diameter of the end of the collar and is a smooth surface.

[0013] The principle and effect of this solution are:

[0014] Compared with the prior art, the utility model ensures the formation of the mud sleeve by the corrugated section of the grouting channel on the inner side of the sleeve and the welded vibrating cone, and ensures that the mud sleeve will not be squeezed and destroyed by sandy soil after forming by the guide ring sleeve, which solves the problem that when traditional jacking pipes are constructed in sandy soil, the sandy soil itself is unstable, and the gap between the jacking pipe and the soil body will be filled with sandy soil during the movement, thereby blocking the formation of the mud sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 A schematic diagram of a device for forming a drag-reducing slurry jacket for a sandy soil pipe jacking proposed in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0017] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the following is a detailed description of the specific implementation method, structure, characteristics and effects of the present invention in combination with the accompanying drawings and preferred embodiments.

[0018] The reference numerals in the drawings of the specification include: jacking pipe 1, mud grouting hole 2, jacking pipe 3, collar 4, corrugated section 5, vibrating cone 6, and guide ring sleeve 7.

[0019] A device for forming a mud sleeve to reduce resistance of a sandy soil pipe jacking, for example Figure 1 As shown:

[0020] It includes a tool head and a collar 4.

[0021] The tool head is against the end of the top pipe 1, and the collar 4 is welded to the top of the tool head. The outer diameters of the tool head and the collar 4 are equal. A boss is integrally formed on the inside of the top of the tool head to resist the top end.

[0022] The collar 4 wraps around the top end, and a grouting channel is opened inside the collar 4 for exposing the grouting hole 2 on the top pipe 1. The grouting channel extends in an arc shape from the end of the top pipe 1 to the end of the collar 4, and the arc opening of the grouting channel faces inward.

[0023] In this embodiment, the inner wall of the grouting channel is further formed with a corrugated section 5. The radius of the corrugated section 5 gradually increases as it extends toward the distal end of the collar 4. The initial end of the corrugated section 5 is located outside the grouting hole 2, with the inwardly concave corrugations aligned with the grouting hole 2. During top advancement, the drag-reducing slurry enters the grouting hole 2 and reaches the corrugated section 5 of the collar 4. The inwardly concave corrugations initially absorb some of the kinetic energy, preventing accumulation and reducing flow velocity. Subsequent, continuous corrugated sections 5 then gradually diffuse the drag-reducing slurry.

[0024] In this embodiment, several vibrating cones 6 are welded circumferentially to the inner wall of the grouting channel behind the corrugated section 5. The ends of the vibrating cones 6 are flush with the ends of the collar 4. During the advancement of the jacking pipe 1, the tool head, and the collar 4, friction and vibration occur between the channel, driving the vibrating cones 6 to vibrate. As the drag-reducing slurry is removed from the collar 4, it vibrates to better form the slurry sleeve.

[0025] At the same time, a guide ring sleeve 7 is fixedly installed at the end of the ring 4, and the inner diameter of the guide ring sleeve 7 is equal to the inner diameter of the end of the ring 4 and is a smooth surface, which plays a transition and support role to prevent it from being squeezed and damaged by sandy soil during the formation of the mud sleeve.

[0026] When the utility model is used, the corrugated section 5 of the grouting channel inside the collar 4 and the welded vibrating cone 6 ensure that the mud sleeve is formed, and the guide ring sleeve 7 ensures that the mud sleeve will not be squeezed and destroyed by sandy soil after forming. This solves the problem that when the traditional jacking pipe 1 is constructed in sandy soil, the sandy soil itself is unstable, and the gap between the jacking pipe 1 and the soil body will be filled with sandy soil during the movement, thereby blocking the formation of the mud sleeve.

[0027] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A device for forming a mud sleeve for reducing resistance in sandy soil jacking pipes, comprising a tool head that abuts against the end of the jacking pipe, a collar fixed to the tool head facing the end of the jacking pipe and wrapping the end of the jacking pipe, a grouting channel for exposing a grouting hole for slurry is opened on the inner side of the collar, and characterized in that: The grouting channel extends in an arc shape from the end of the top pipe to the end of the collar, with the arc opening facing inward, and a corrugated section is formed on the inner wall of the grouting channel.

2. The device for forming a drag-reducing mud jacket for a sandy soil pipe jacking according to claim 1, characterized in that: As the corrugated section extends toward the end of the collar, the radius of the corrugation gradually increases.

3. The device for forming a drag-reducing mud jacket for a sandy soil pipe jacking according to claim 2, characterized in that: The starting end of the corrugated section is located outside the mud grouting hole, and the inwardly concave corrugations are aligned with the mud grouting hole.

4. The device for forming a drag-reducing mud jacket for a sandy soil pipe jacking according to claim 2, characterized in that: The inner wall of the grouting channel located behind the corrugated section is also circumferentially fixed with a number of vibrating cones.

5. The device for forming a drag-reducing mud jacket for a sandy soil pipe jacking according to claim 4, characterized in that: The end portion of the vibrating cone is flush with the end portion of the collar.

6. The device for forming a drag-reducing mud jacket for a sandy soil pipe jacking according to claim 1, characterized in that: The end of the collar is fixedly connected with a guide ring sleeve, and the inner diameter of the guide ring sleeve is equal to the inner diameter of the end of the collar and is a smooth surface.

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