Low-resistance outer sheath nodular cast iron micro jacking pipe

Abstract

The utility model discloses a low-resistance outer protective layer nodular cast iron micro jacking pipe which is characterized in that a straight pipe section is included, one end of the straight pipe section is a bell mouth, the other end of the straight pipe section is a spigot, and the straight pipe section is used as a working pipe of the micro jacking pipe; the straight pipe section is arranged in the outer protective pipe, the outer surface of the outer protective pipe is smooth, and the outer protective pipe is used for reducing resistance in the jacking process; the pipe fitting is in socket connection with the straight pipe section, the pipe fitting and the straight pipe section are stressed together in the jacking process, and the pipe fitting and the straight pipe section form a jacking assembly. The utility model relates to the technical field of micro jacking pipes, in particular to a nodular cast iron micro jacking pipe with a low-resistance outer protective layer, which utilizes a truncated straight pipe section to directly serve as a working pipe of the micro jacking pipe, greatly reduces material waste, and effectively reduces friction force between a pipeline and surrounding soil by adopting a smooth PE outer protective pipe. Therefore, the resistance in the jacking process is reduced, and the construction efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of micro-jacking pipes, in particular to a ductile iron micro-jacking pipe with a low-resistance outer protective layer. Background Art

[0002] Ductile iron trenchless construction pipeline construction has been widely used in the laying of urban water supply and drainage pipelines. During pipeline construction, pipe jacking technology is a commonly used trenchless technology. It pushes the pipeline into the preset pipeline trajectory in a smaller working well under the ground, thus avoiding large-scale excavation work. However, during the jacking process, traditional pipe jacking technology often requires a large jacking force due to the large friction between the pipeline and the soil, which not only increases the construction difficulty but also increases the construction cost. In addition, in actual construction, some areas of the city are limited by space and cannot set up ordinary working wells and receiving wells. Therefore, short jacking pipes (such as 1 meter or 2 meters long) are very necessary in urban trenchless construction. Therefore, a ductile iron micro-jacking pipe with a low-resistance outer protective layer is designed. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a ductile iron micro-jacking pipe with a low-resistance outer protective layer, which uses a shortened straight pipe section directly as the working pipe of the micro-jacking pipe, greatly reducing material waste. By adopting a smooth outer protective pipe, the friction between the pipeline and the surrounding soil is effectively reduced, thereby reducing the resistance during the jacking process and improving construction efficiency and safety.

[0004] A micro-jacking pipe with a low-resistance outer sheath and ductile iron, characterized by: a straight pipe section, one end of which is a socket, the other end of which is a spigot, and the straight pipe section is used as a working pipe of the micro-jacking pipe;

[0005] An outer protective pipe, wherein the straight pipe section is provided inside the outer protective pipe, and the outer surface of the outer protective pipe is smooth, so as to reduce resistance during the jacking process;

[0006] a pipe fitting, wherein the pipe fitting is connected to the straight pipe section in a socket-and-spigot manner and is subjected to force together with the straight pipe section during the jacking process, wherein the pipe fitting and the straight pipe section form a jacking assembly;

[0007] a reinforced concrete layer, the reinforced concrete layer comprising concrete and steel bars, the steel bars being arranged in the concrete, and the reinforced concrete layer being arranged between the outer protective pipe and the jacking assembly;

[0008] The inner wall of the straight pipe section is provided with an inner lining, the inner lining is cement mortar, and the inner lining serves as an inner anti-corrosion coating of the straight pipe section;

[0009] The rubber ring is arranged between the pipe fitting and the straight pipe section and is used for sealing the connection between the pipe fitting and the straight pipe section to ensure the sealing of the connection port of the pipe fitting and the straight pipe section.

[0010] As a further limitation of the present technical solution, the straight pipe section is a cast iron pipe body, and the cast iron pipe body is made of ductile iron material.

[0011] As a further limitation of the present technical solution, the pipe fitting has two connection ports for connecting to adjacent straight pipe sections.

[0012] As a further limitation of the present technical solution, the rubber ring is made of rubber material to ensure the sealing performance of the connection part when the pipeline undergoes radial displacement and deformation during the jacking process.

[0013] As a further limitation of the present technical solution, there are a plurality of steel bars with the same spacing between them, which are arranged and woven in the concrete along the circumferential direction of the outer protective tube to form a steel mesh.

[0014] As a further limitation of the present technical solution, the diameter of the steel bars is 4±0.2 mm, and the spacing between adjacent steel bars is 100±5 mm.

[0015] As a further limitation of the present technical solution, the coating of the lining adopts centrifugal casting or spraying technology to ensure the uniformity and adhesion of the lining.

[0016] As a further limitation of the present technical solution, the outer protective tube is a fiberglass outer protective tube, and the thickness of the outer protective tube is 2 mm to 5 mm, so as to provide sufficient protection while maintaining lightness.

[0017] As a further limitation of the present technical solution, the outer protective pipe can serve as a mold for the outer lining concrete.

[0018] Compared with the prior art, the advantages and positive effects of the present invention are:

[0019] (1) Using a shortened straight pipe section directly as the working pipe of the micro-jacking pipe greatly reduces material waste. By adopting a smooth outer protective pipe, the friction between the pipe and the surrounding soil is effectively reduced, thereby reducing the resistance during the jacking process and improving construction efficiency. In the production process, the outer protective pipe is used as a mold for the outer lining concrete, which reduces the mold and improves production efficiency, solves the mold limitation and realizes the conditions for mass production of micro-jacking pipes; (2) A reinforced concrete layer is set between the outer protective pipe and the jacking part to enhance the overall structural strength of the pipeline, so that it can withstand greater jacking force and underground pressure. High-strength reinforced concrete is used to withstand axial jacking force, eliminating the traditional design of using a welded flange structure to withstand axial jacking force, greatly reducing production costs. The outer protective pipe is a glass fiber reinforced plastic outer protective pipe with a thickness designed to be between 2mm and 5mm, which provides sufficient protection while maintaining the lightness of the pipeline;

[0020] (3) The cement mortar lining on the inner wall of the straight pipe section provides a good internal anti-corrosion coating, which extends the service life of the pipeline. The coating of the lining adopts centrifugal casting or spraying technology, which ensures the uniformity and adhesion of the lining and improves the anti-corrosion effect;

[0021] (4) By setting an elastic rubber ring between the pipe fitting and the straight pipe section, the sealing of the connection port is ensured, preventing the erosion of the pipeline by groundwater and soil. The rubber ring is made of rubber material and can adapt to the situation where the pipeline undergoes certain radial displacement and deformation during the jacking process, and can ensure the sealing performance of the connection part. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of this application and constitute a part of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation on this application. Obviously, the drawings described below are only some embodiments of the utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without inventive effort. In the drawings:

[0023] Figure 1 It is a cross-sectional view of the present invention.

[0024] In the figure: 1. Pipe fittings, 2. Outer protective pipe, 3. Concrete, 4. Steel bars, 5. Rubber rings, 6. Straight pipe sections, 7. Inner lining. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the accompanying drawings and implementation examples.

[0026] A micro-jacking pipe with a low-resistance outer sheath and ductile iron, characterized by: a straight pipe section 6, one end of which is a socket, and the other end of which is a spigot, the straight pipe section serving as a working pipe for the micro-jacking pipe, the straight pipe section 6 being shortened, and the length of each straight pipe section 6 after being cut can be 1 meter or 2 meters;

[0027] An outer protective pipe 2, wherein the straight pipe section 6 is provided inside the outer protective pipe 2, and the outer surface of the PE outer protective pipe 2 is smooth to reduce resistance during the jacking process;

[0028] A pipe fitting 1, wherein the pipe fitting 1 is connected to the straight pipe section 6 by a socket connection, and is subjected to force together with the straight pipe section 6 during the jacking process, and the pipe fitting 1 and the straight pipe section 6 form a jacking assembly;

[0029] A reinforced concrete layer, the reinforced concrete layer comprising concrete 3 and steel bars 4, the steel bars 4 being arranged in the concrete 3, and the reinforced concrete layer being arranged between the outer protective pipe 2 and the jacking assembly;

[0030] The inner wall of the straight pipe section 6 is provided with an inner lining 7, and the inner lining 7 is cement mortar, and the inner lining 7 serves as an inner anti-corrosion coating of the straight pipe section 6;

[0031] The rubber ring 5 is arranged between the pipe fitting 1 and the straight pipe section 6 and is used for sealing the connection between the pipe fitting 1 and the straight pipe section 6 to ensure the sealing of the connection port of the pipe fitting 1 and the straight pipe section 6.

[0032] In this embodiment, by adopting the glass fiber reinforced plastic outer protective pipe 2 with a smooth outer wall, the friction between the pipeline and the surrounding soil is effectively reduced, thereby reducing the resistance during the jacking process.

[0033] The straight pipe section 6 is a cast iron pipe body, and the cast iron pipe body is made of ductile iron material, which provides higher strength and good corrosion resistance.

[0034] The pipe fitting 1 has two connection ports for connecting to the adjacent straight pipe sections 6 .

[0035] The rubber ring 5 is made of rubber material to ensure the sealing performance of the connection part when the pipeline is radially displaced and deformed during the jacking process.

[0036] There are a plurality of steel bars 4 , and the spacing between the steel bars 4 is the same. They are arranged and woven in the concrete 3 along the circumferential direction of the outer protective pipe 2 to form a steel mesh, which can increase the overall structural strength of the pipeline.

[0037] The diameter of the steel bars 4 is 4±0.2 mm, and the distance between adjacent steel bars 4 is 100±5 mm.

[0038] The coating of the inner lining 7 is carried out by centrifugal casting or spraying technology to ensure the uniformity and adhesion of the inner lining.

[0039] In this embodiment, a cement mortar lining 7 is coated on the inner wall of the straight pipe section 6 by using centrifugal casting or spraying technology to ensure that the lining is evenly and firmly attached to the pipe wall of the straight pipe section 6.

[0040] The outer protective tube 2 is a glass fiber reinforced plastic outer protective tube, and the thickness of the outer protective tube 2 is 2 mm to 5 mm, so as to provide sufficient protection while maintaining lightness.

[0041] The outer protective pipe 2 can be used as a mold for the outer lining concrete.

[0042] In this embodiment, the straight pipe section 6 serves as the working pipe of the micro-jacking pipe, and the pipe fitting 1 is connected to one end of the straight pipe section 6. A rubber ring 5 is pre-arranged in the pipe fitting 1, and the rubber ring 5 is sleeved on one end of the straight pipe section 6. One end of the straight pipe section 6 is inserted into the pipe fitting 1. The rubber ring 5 can ensure the sealing of the connection between the pipe fitting 1 and the straight pipe section 6. The pipe fitting 1 and the straight pipe section 6 are pushed into the middle of the outer protective tube 2. The steel bars 4 with a diameter of 4±0.2mm are woven into a steel mesh at a spacing of 100±5mm. The steel bars 4 are arranged in a circle and the cage-shaped skeleton formed can be inserted into the gap between the outer protective tube 2, the straight pipe section 6 and the pipe fitting 1. The adjacent steel bars 4 are fixed by winding iron wire to form a steel mesh. The steel mesh is placed between the PE outer protective tube 2, the straight pipe section 6 and the pipe fitting 1, and then concrete 3 is poured in the gap between the outer protective tube 2, the straight pipe section 6 and the pipe fitting 1 to form a concrete steel layer to complete the assembly of the micro-jacking pipe.

[0043] In this embodiment, a plurality of micro-jacking pipes are arranged in a straight line and connected to form a pipeline.

[0044] During construction, the micro-jacking pipe is placed in the working well, and the jacking equipment is started to push the micro-jacking pipe into the designed pipeline trajectory one by one.

[0045] The above disclosure is only a specific embodiment of the present invention, but the present invention is not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the scope of protection of the present invention.

Claims

1. A ductile iron micro-jacking pipe with a low-resistance outer sheath, characterized by: A straight pipe section (6), one end of the straight pipe section (6) is a socket, the other end of the straight pipe section (6) is a spigot, and the straight pipe section is used as a working pipe for micro-jacking; An outer protective tube (2), wherein the straight tube section (6) is provided inside the outer protective tube (2), and the outer surface of the outer protective tube (2) is smooth, so as to reduce resistance during the jacking process; A pipe fitting (1), wherein the pipe fitting (1) is connected to the straight pipe section (6) by a socket connection, and is subjected to force together with the straight pipe section (6) during the jacking process, and the pipe fitting (1) and the straight pipe section (6) form a jacking assembly; A reinforced concrete layer, the reinforced concrete layer comprising concrete (3) and steel bars (4), the steel bars (4) being arranged in the concrete (3), and the reinforced concrete layer being arranged between the outer protective pipe (2) and the jacking assembly; The inner wall of the straight pipe section (6) is provided with an inner lining (7), the inner lining (7) is cement mortar, and the inner lining (7) serves as an inner anti-corrosion coating of the straight pipe section (6); A rubber ring (5) is provided between the pipe fitting (1) and the straight pipe section (6) and is used for sealing the connection between the pipe fitting (1) and the straight pipe section (6) to ensure the sealing of the connection port between the pipe fitting (1) and the straight pipe section (6).

2. The low-resistance outer sheath ductile iron micro-jacking pipe according to claim 1, characterized in that: The straight pipe section (6) is a cast iron pipe body, and the cast iron pipe body is made of ductile iron material.

3. The low-resistance outer sheath ductile iron micro-jacking pipe according to claim 2, characterized in that: The pipe member (1) has two connection ports for connecting to adjacent straight pipe sections (6).

4. The low-resistance outer sheath ductile iron micro-jacking pipe according to claim 1, characterized in that: The rubber ring (5) is made of rubber material to adapt to the radial displacement and deformation of the pipeline during the jacking process and ensure the sealing performance of the connection part.

5. The low-resistance outer sheath ductile iron micro-jacking pipe according to claim 1, characterized in that: There are a plurality of steel bars (4) with the same spacing between them, which are arranged and woven in the concrete (3) along the circumferential direction of the outer protective tube (2) to form a steel mesh.

6. The low-resistance outer sheath ductile iron micro-jacking pipe according to claim 5, characterized in that: The diameter of the steel bars (4) is 4±0.2 mm, and the spacing between adjacent steel bars (4) is 100±5 mm.

7. The low-resistance outer sheath ductile iron micro-jacking pipe according to claim 1, characterized in that: The coating of the inner lining (7) adopts centrifugal casting or spraying technology to ensure the uniformity and adhesion of the inner lining.

8. The low-resistance outer sheath ductile iron micro-jacking pipe according to claim 1, characterized in that: The outer protective tube (2) is a glass fiber reinforced plastic outer protective tube, and the thickness of the outer protective tube (2) is 2 mm to 5 mm, so as to provide sufficient protection while maintaining lightness.

9. The low-resistance outer sheath ductile iron micro-jacking pipe according to claim 8, characterized in that: The outer protective pipe (2) can serve as a mold for the outer lining concrete.

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