Straight top mounting structure suitable for short-distance soft soil

Abstract

The utility model provides a straight top installation structure suitable for short-distance soft soil, which comprises a foundation pit and a newly-built connection foundation pit, a top pipe is inserted between the foundation pit and the newly-built connection foundation pit, a jack is installed at the rear end of the top pipe, the front end of the jack abuts against the tail end of the top pipe, the rear end of the jack tightly abuts against the inner wall of the foundation pit, and the top pipe is connected with the jack. The jacking pipe is formed by welding a plurality of sections of jacking pipe bodies, the surface of each section of jacking pipe body is coated with an anti-corrosion coating layer, and the surface of each anti-corrosion coating layer is coated with a butter layer. The straight top mounting structure suitable for short-distance soft soil is reasonable in design, simple in construction and stable in structure, and can effectively solve the problems of how to communicate a newly-built pipeline with a foundation pit, how to connect the newly-built pipeline with the foundation pit and how to effectively and quickly penetrate through the pipeline / channel box / bridge.

Description

Technical Field

[0001] The utility model relates to a straight top installation structure, in particular to a straight top installation structure suitable for short-distance soft soil. Background Art

[0002] Existing pipe jacking generally has a front-mounted pipe jacking machine head, which is used to jack the pipe by digging and discharging the soil. Or, when the geological conditions are controllable, artificial open pipe jacking is used. In order to avoid collapse of the front end of the pipe or sudden water inrush, a tool head similar to a shutter is generally placed at the front end.

[0003] When it is necessary to connect a new pipe to an existing inspection well, since the inner diameter of the existing inspection well is generally 1.0-2.0m, and the length of the jacking machine head is not less than 3.5m, it is difficult to remove the pipe using the jacking machine head. In order to avoid the problem of the jacking machine head tilting, the soil covering the top of the pipe should generally not be less than 3.0m and not less than 1.5 times the outer diameter of the pipe.

[0004] The inner diameter of the artificial open pipe jacking should be no less than 800mm to meet the basic operating space and construction safety requirements. Due to the frequent accidents of artificial open pipe jacking, artificial pipe jacking has been explicitly prohibited in many places.

[0005] When the site where the new pipeline is located is soft soil and it needs to pass under the existing pipeline / channel box / bridge, due to the short crossing distance, if a jacking machine head is used, firstly, jacking wells need to be built at both ends of the jacking pipe, which is very costly; secondly, if the new pipeline needs to be connected to the original inspection well, there is a problem that the machine head cannot be removed, which is difficult to implement; thirdly, the machine head jacking pipe requires covering with soil, and the pipeline elevation needs to be lowered, so there will be an inverted siphon section, which is not conducive to the functional use of the pipeline; fourthly, if manual jacking is used, the soft soil needs to be reinforced in advance to ensure safety, but in many cases (such as passing under a bridge with a lower clear height), there is no space to reinforce the soft soil on site, and manual jacking is very dangerous and is not recommended. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the utility model proposes a straight-top installation structure suitable for short-distance soft soil, which effectively solves the problems of how to connect the newly built pipeline to the foundation pit and the newly built connecting foundation pit, and how to effectively and quickly pass the newly built pipeline under the pipeline / channel box / bridge.

[0007] In order to realize the above technical scheme, the utility model provides a straight top installation structure suitable for short-distance soft soil, including: a foundation pit and a newly built connecting foundation pit, a jacking pipe is inserted between the foundation pit and the newly built connecting foundation pit, a jacking pipe is installed at the rear end of the jacking pipe, the front end of the jacking pipe is abutted against the end of the jacking pipe, and the rear end of the jacking pipe is tightly pressed against the inner wall of the foundation pit, the jacking pipe is welded by multiple sections of jacking pipe bodies, the surface of each section of the jacking pipe body is coated with an anti-corrosion coating layer, and the surface of the anti-corrosion coating layer is coated with a butter layer.

[0008] In the above technical scheme, the jacking pipe is welded by multiple sections of jacking pipe bodies. During actual construction, the front end of the first section of the jacking pipe body is inserted into the soft soil of the side wall of the foundation pit, and then the first section of the jacking pipe body is pushed into the soft soil using a jack, the jack is released, and the second section of the jacking pipe body is welded at the end of the first section of the jacking pipe body, and then the second section of the jacking pipe body is pushed into the soft soil using a jack, and so on, until the first section of the jacking pipe body penetrates into the newly built connecting foundation pit, and the jacking pipe connection between the foundation pit and the newly built connecting foundation pit is realized, and then the construction can be carried out, and the soft soil in the jacking pipe is taken out, and the pipeline connection between the foundation pit and the newly built connecting foundation pit is realized, which greatly facilitates the pipeline construction between the foundation pit and the newly built connecting foundation pit. In order to speed up the jacking construction and avoid the situation where the jacking resistance increases due to pauses in the middle, the surface of each section of the jacking pipe body is coated with an anti-corrosion coating layer to avoid the phenomenon of pipeline locking during the jacking construction process. In order to reduce the friction during the jacking construction process, after applying a layer of high-efficiency anti-corrosion paint, a layer of butter is quickly applied to the surface of the jacking body, thereby reducing the friction during the jacking process on the surface of the jacking body and facilitating jacking.

[0009] Preferably, the length of each section of the jacking pipe body is smaller than the diameter of the foundation pit, so that the jacking pipe body can smoothly enter the foundation pit and be pushed forward by the jack.

[0010] Preferably, the front end of the first section of the jacking pipe body is sharpened to reduce the resistance of the first section of the jacking pipe body when it is pushed forward.

[0011] Preferably, the jacking pipe is a Q235 steel pipe.

[0012] The beneficial effect of the straight-top installation structure suitable for short-distance soft soil provided by the utility model is that the straight-top installation structure suitable for short-distance soft soil has a reasonable design, simple construction, and stable structure, and can effectively solve the problems of how to connect the newly built pipeline to the foundation pit and the newly built connecting foundation pit, and how to effectively and quickly pass the newly built pipeline under the pipeline / channel box / bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the construction structure of the utility model.

[0014] Figure 2 for Figure 1 Schematic diagram of the enlarged structure of the first top pipe body A.

[0015] In the figure: 1. Ground; 2. Soft soil; 3. Foundation pit; 4. Reinforcement grouting block; 5. New connection foundation pit; 6. Jack; 7. Jacking pipe; 71. Jacking pipe body; 72. Anti-corrosion coating layer; 73. Butter layer; 8. Weld. DETAILED DESCRIPTION

[0016] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0017] Embodiment: A direct jacking installation structure applicable to short-distance soft soil.

[0018] Refer to Figures 1 to 2 As shown, a direct jacking installation structure applicable to short-distance soft soil includes: a foundation pit 3 and a newly built connecting foundation pit 5. During actual construction, the foundation pit 3 and the newly built connecting foundation pit 5 need to be connected by pipes to facilitate the laying of cables and pipes between the foundation pit 3 and the newly built connecting foundation pit 5. A jacking pipe 7 is inserted between the foundation pit 3 and the newly built connecting foundation pit 5. A jack 6 is installed at the rear end of the jacking pipe 7. The front end of the jack 6 abuts against the end of the jacking pipe 7, and the rear end of the jack 6 is tightly pressed against the inner wall of the foundation pit 3. The jacking pipe 7 is welded by multiple sections of jacking pipe bodies 71. The jacking pipe body 71 is a Q235 steel pipe. An anti-corrosion coating layer 72 is coated on the surface of each section of the jacking pipe body 71, and a butter layer 73 is coated on the surface of the anti-corrosion coating layer 72. The length of each section of the jacking pipe body 71 is less than the diameter of the foundation pit 3 to facilitate the smooth entry of the jacking pipe body 71 into the foundation pit 3 and its forward jacking by the jack 6. The front end of the first section of the jacking pipe body 71 is sharpened to reduce the resistance when the first section of the jacking pipe body 71 is jacked forward.

[0019] In this embodiment, the jacking pipe 7 is welded by multiple sections of jacking pipe bodies 71. During actual construction, after the front end of the first section of the jacking pipe body 71 is sharpened, it is inserted into the soft soil 2 on the side wall of the foundation pit 3. Then, the first section of the jacking pipe body 71 is jacked into the soft soil 2 using the jack 6. Then, the jack 6 is loosened, and the second section of the jacking pipe body 72 is welded to the end of the first section of the jacking pipe body 71. After the two jacking pipe bodies 71 are welded, they are connected by a weld 8. Then, the second section of the jacking pipe body 71 is jacked into the soft soil 2 using the jack 6, and so on, until the first section of the jacking pipe body 71 penetrates into the newly built connecting foundation pit 5, realizing the connection of the jacking pipe 7 between the foundation pit 3 and the newly built connecting foundation pit 5. Then, construction can be carried out to remove the soft soil 2 in the jacking pipe 7, realizing the connection of the pipes between the foundation pit 3 and the newly built connecting foundation pit 5, which greatly facilitates the pipe construction between the foundation pit 3 and the newly built connecting foundation pit 5.

[0020] The structure of the utility model adopts a direct jacking method of the jacking pipe 7, that is, no front head is set, and a front-end open jacking pipe 7 is adopted. The jacking is directly pushed in at the tail end of the pipe with a jack 6. In order to avoid large resistance at the front end of the pipe, a steel pipe with a small cross-sectional area is used instead of a concrete pipe for jacking, and the front end of the first section of the jacking pipe body 71 is sharpened. Before the specific construction, the direction of the jacking pipe 7 and the jack 6 is adjusted first, and at the same time, the soil at the opening of the jacking pipe 7 is horizontally grout-reinforced by 1m using a reinforcement grouting block 4 to prevent water and soil from gushing out during the jacking process. The jacking pipe 7 is lengthened by welding and connection. After reaching the end point, the soil at the end point of the pipeline is solidified by a rotary jet pile or a grouting process, and then the soil that has been isolated in the jacking pipe 7 is mechanically or manually removed, thereby avoiding the risk of water and sand gushing during the construction process.

[0021] In order to speed up the construction and avoid the situation where the resistance of the jacking pipe 7 increases due to the pause in the middle, the surface of each section of the jacking pipe body 71 is coated with an anti-corrosion coating layer 72, that is, a graphene-modified solvent-free ceramic corrosion-resistant coating topcoat is used for anti-corrosion. This paint is made of graphene-modified ceramic organic resin, with a light yellow appearance, a viscous liquid without stratification and impurities, and has excellent flexibility and good corrosion resistance and wear resistance. The high-pressure airless spraying process is adopted, and the single spraying thickness (dry film) is 120-130um, divided into two layers of primer and topcoat; the surface drying time is 5 hours at 25℃ and 30 minutes at 70℃, which greatly speeds up the construction process and avoids the phenomenon of pipe locking during the jacking process. In order to reduce the friction during the jacking construction process, after applying the efficient anti-corrosion coating layer, the butter layer 73 is quickly applied on the surface of the jacking pipe body 71, thereby reducing the friction during the jacking process of the jacking pipe body 71 and facilitating the jacking.

[0022] This direct jacking installation structure suitable for short-distance soft soil has a reasonable design, simple construction, and stable structure. It effectively combines the advantages of machine head jacking and open jacking. By adjusting the process, the jacking and soil extraction after jacking are organically combined, effectively solving the problems of how to jack the new pipeline into the existing inspection well, how to effectively and quickly pass the new pipeline under the pipeline / channel box / bridge, and how to avoid manual jacking. It avoids the situation that ordinary machine head jacking needs to build a new jacking well and may need to lower the pipeline elevation. At the same time, there is no need to carry out the high-risk manual open jacking, which is safe, economical, practical, and environmentally friendly.

[0023] The above is only a preferred embodiment of the present invention, but the present invention should not be limited to the contents disclosed in the embodiment and the drawings, so any equivalent or modification completed without departing from the spirit disclosed in the present invention shall fall within the scope of protection of the present invention.

Claims

1. A direct top installation structure suitable for short-distance soft soil, comprising: The foundation pit and the newly built connecting foundation pit are characterized in that: a jacking pipe is inserted between the foundation pit and the newly built connecting foundation pit, a jack is installed at the rear end of the jacking pipe, the front end of the jack is abutted against the end of the jacking pipe, the rear end of the jack is pressed tightly against the inner wall of the foundation pit, the jacking pipe is welded by multiple sections of jacking pipe bodies, the surface of each section of the jacking pipe body is coated with an anti-corrosion coating layer, and the surface of the anti-corrosion coating layer is coated with a butter layer.

2. The straight top installation structure suitable for short-distance soft soil according to claim 1, characterized in that: The length of each section of the jacking pipe body is smaller than the diameter of the foundation pit.

3. The straight top installation structure suitable for short-distance soft soil as claimed in claim 2 is characterized by: The front end of the first section of the top pipe body is sharpened.

4. The straight top installation structure suitable for short-distance soft soil according to claim 1, characterized in that: The jacking pipe is a Q235 steel pipe.

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