A method of sealing a bell and spigot pipe joint with a gas bag

Abstract

The application provides a method for sealing a pipe joint by using an air bag, comprising the following steps: installing a manhole; inserting one end of a pipe into a reserved opening of the manhole and sealing by using a first air bag to form a first filling cavity between the pipe and the reserved opening; connecting a socket end and a spigot end of the pipe and sealing by using a second air bag to form a second filling cavity between the socket end and the spigot end; injecting sealing slurry into the first filling cavity and the second filling cavity; and extracting the first air bag and the second air bag after the sealing slurry solidifies. The method has the beneficial effects of effectively compensating for geometric deviation of the pipe joint, improving sealing reliability and anti-permeation performance, being convenient for construction and repeatable operation, being suitable for various pipe diameters and complex working conditions, significantly improving safety and durability of the pipe system in operation, and improving engineering quality.

Description

Technical Field

[0001] This invention belongs to the field of pipe joint sealing technology, and in particular relates to a method for sealing socket pipe joints using an airbag. Background Technology

[0002] With the continuous expansion of urban infrastructure construction, the application of various socket-type pipelines for water supply, drainage, gas, and heating is becoming increasingly widespread. The sealing performance of the socket-type pipeline joints is directly related to the safe and stable operation of the entire pipeline system. If the sealing is inadequate, leaks are very likely to occur, which not only wastes water and energy resources, but may also cause land subsidence, environmental pollution, and even safety accidents, posing a serious threat to people's lives and property and the normal operation of the city.

[0003] In existing technologies, traditional methods for sealing socket pipe joints often employ materials such as rubber sealing rings, hemp fiber cement, and expansion sealing strips, achieving sealing through compression and filling. However, these methods present the following technical problems in practical applications:

[0004] 1) The sealing effect of rubber sealing rings depends on their compression and uniformity. If the pipe has an ellipticity deviation, the socket or spigot size is not standard, or the sealing ring is not accurately positioned or subjected to uneven force during installation, it is very easy to cause sealing failure.

[0005] 2) Using hemp fiber cement and other filling materials for sealing has problems such as complex construction process, high labor intensity, long curing time, and the sealing reliability is greatly affected by human operation factors. In addition, it is difficult to remove the pipe during the later maintenance or replacement of the pipeline, and it is easy to damage the pipeline body.

[0006] 3) For some special working conditions, such as large-diameter pipelines, high-pressure pipelines, and environments with humid, underwater or corrosive media, the adaptability and durability of traditional sealing methods are difficult to meet the requirements.

[0007] Therefore, there is an urgent need for a sealing method for socket pipe interfaces that is easy to operate, provides reliable sealing, has high construction efficiency, and is easy to maintain in the later stages. Summary of the Invention

[0008] To solve the above-mentioned technical problems, the present invention provides a method for sealing the socket pipe interface using an airbag, which overcomes the shortcomings of the prior art.

[0009] The technical solution adopted in this invention is: a method for sealing a socket pipe interface using an airbag, comprising the following steps:

[0010] Install inspection wells;

[0011] One end of the pipe is inserted into the reserved opening of the inspection well and sealed with a first airbag, forming a first filling cavity between the pipe and the reserved opening;

[0012] The socket end and spigot end of the pipe are connected and sealed with a second airbag, forming a second filling cavity between the socket end and the spigot end;

[0013] Inject sealing grout into the first and second filling cavities;

[0014] After the sealing slurry solidifies, the first and second airbags are removed.

[0015] Further, the step of inserting one end of the pipe into the reserved opening of the inspection well and sealing it with a first airbag to form a first filling cavity between the pipe and the reserved opening includes the following steps:

[0016] The first airbag is inserted into the insertion end of the pipe, so that the first airbag is located on one side of the reserved opening;

[0017] Insert the insertion end of the pipe into the reserved hole;

[0018] The first airbag is inserted into the insertion end of the pipe, so that the first airbag is located on the other side of the reserved hole, and there is a gap between the first airbags.

[0019] Furthermore, the step of connecting the socket end and the spigot end of the pipe and sealing it with a second airbag to form a second filling cavity between the socket end and the spigot end includes the following steps:

[0020] The second airbag and the sealing ring are sequentially inserted into the insertion end;

[0021] Insert the spigot end into the socket end, so that the sealing ring is located inside the pipe interface and the second airbag is located outside the pipe interface, with a gap between the sealing ring and the second airbag.

[0022] Furthermore, before connecting the socket end and the spigot end, the socket end and the spigot end are cleaned and the insertion depth is marked.

[0023] Furthermore, before injecting the sealing slurry into the first filling cavity and the second filling cavity, the step further includes the following step: inflating the first airbag and the second airbag so that the first airbag and the second airbag fit into the pipe.

[0024] Furthermore, the step involves injecting sealing grout into the first and second filling cavities, inserting a grouting pipe into the gap between the first and second airbags and the pipe, and injecting the sealing grout through the grouting pipe, which is connected to a grouting pump.

[0025] Furthermore, a pressure gauge is connected between the grouting pipe and the grouting pump to detect the grouting pressure.

[0026] Furthermore, the grouting pressure is set to 0.1–0.3 MPa.

[0027] Furthermore, the sealing grout is a mixture of cement, water glass, and a retarder.

[0028] Furthermore, the installation process in the inspection well includes the following steps:

[0029] The inspection wells are installed at both ends of the pipeline;

[0030] The inspection well was inspected.

[0031] The advantages and positive effects of this invention are:

[0032] 1) Effectively compensates for geometric deviations at pipe joints, improves sealing reliability and impermeability, is easy to construct and repeatable, is suitable for various pipe diameters and complex working conditions, significantly improves the safety and durability of pipeline system operation, and enhances project quality.

[0033] 2) It ensures the sealing performance of the pipe joints and improves construction efficiency. After being pressurized, the airbag can transmit pressure evenly, ensuring that the filling material in the annular gap is uniformly dense, effectively avoiding leakage problems caused by local defects. The sealing grout reacts quickly and has high early strength. Combined with the airbag support molding, it significantly shortens the curing cycle and meets the needs of rapid construction. Attached Figure Description

[0034] The above and other objects, features, and advantages of the present invention will become more apparent from the more detailed description of the embodiments of the invention in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same parts or steps.

[0035] Figure 1 This is a process diagram of a method for sealing a socket pipe interface using an airbag according to an embodiment of the present invention.

[0036] In the diagram: 1. First section of pipe; 2. Second section of pipe; 3. First airbag; 4. Second airbag; 5. Sealing ring; 6. Grouting pipe; 7. Sealing grout; 8. Grouting pump; 9. Inspection well; 10. Pressure gauge. Detailed Implementation

[0037] This invention provides a method for sealing a socket pipe interface using an airbag. The embodiments of this invention will be described below with reference to the accompanying drawings.

[0038] In the description of the embodiments of this invention, it should be understood that the terms "top," "bottom," etc., indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "set" and "connected" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention through specific circumstances.

[0039] like Figure 1 As shown in the figure, an embodiment of the present invention provides a method for sealing a socket pipe interface using airbags, comprising the following steps: installing a manhole 9; inserting one end of a pipe into a pre-reserved opening in the manhole 9 and sealing it with a first airbag 3 to form a first filling cavity between the pipe and the pre-reserved opening; connecting the socket end and the spigot end of the pipe and sealing it with a second airbag 4 to form a second filling cavity between the socket end and the spigot end; injecting sealing grout 7 into the first filling cavity and the second filling cavity; and after the sealing grout 7 has solidified, removing the first airbag 3 and the second airbag 4. By placing an expandable airbag within the annular gap of the socket joint and filling it with a medium to inflate it, the radial pressure generated by the expansion of the airbag tightly adheres to the inner and outer walls of the socket joint, thereby achieving rapid and reliable sealing. The controllable expansion characteristic of the airbag enables temporary sealing and shaping of the annular gap of the socket joint, creating a stable space for subsequent grout injection. Then, sealing grout 7 is injected between the inner side of the airbag and the annular gap of the socket joint. After the sealing grout 7 solidifies, the airbag is removed, forming a complete sealing layer. This effectively overcomes the limitations of traditional sealing materials that require high pipe dimensional accuracy and installation process, and improves the sealing performance of pipe joints.

[0040] The following is a detailed introduction:

[0041] S1. Install inspection well 9;

[0042] Manhole 9 needs to be prefabricated, and a reserved opening should be made on one side of manhole 9. Before installing manhole 9, the center axis, elevation, and dimensions of the reserved opening need to be checked. After the inspection is passed, the next process can proceed.

[0043] The entire pipeline is composed of multiple pipe sections connected together. Inspection wells 9 are installed at both ends of the entire pipeline. The spigot ends of the first and last pipe sections are inserted into the reserved openings of the inspection wells 9. All other pipe joints are connected using spigot and socket joints.

[0044] S2. Insert one end of the pipe into the reserved opening of the inspection well 9 and seal it with the first airbag 3 to form a first filling cavity between the pipe and the reserved opening;

[0045] The steps include: inserting the first airbag 3 into the insertion end of the pipe, so that the first airbag 3 is located on one side of the reserved opening; inserting the insertion end of the pipe into the reserved opening; inserting the first airbag 3 into the insertion end of the pipe, so that the first airbag 3 is located on the other side of the reserved opening, and a gap is provided between the first airbags 3.

[0046] In this embodiment, the first pipe section 1 is lifted using hoisting machinery. Before installation, a ring-shaped first airbag 3 is fitted onto the spigot end of the first pipe section 1. After the first airbag 3 is fitted, its position is kept on the outside of one side of the reserved opening, and care is taken to protect the first airbag 3 from external force and mechanical damage. The spigot end of the first pipe section 1 is inserted into the reserved opening, the length of the first pipe section 1 inserted into the reserved opening is adjusted, the first pipe section 1 is fixed, and then the gap on the outside of the pipe joint is adjusted to be uniform. After adjustment, another ring-shaped first airbag 3 is fitted onto the spigot end of the first pipe section 1, keeping the position of the first airbag 3 on the outside of the other side of the reserved opening. The two first airbags 3 are respectively engaged and fixed to the inner wall of the reserved opening, leaving a ring-shaped gap between the two first airbags 3, forming a ring-shaped first filling cavity between the first pipe section 1 and the inner wall of the reserved opening.

[0047] S3. Connect the socket end and spigot end of the pipe and seal it with the second airbag 4 to form a second filling cavity between the socket end and the spigot end;

[0048] The steps include: sequentially inserting the second airbag 4 and the sealing ring 5 into the spigot end; inserting the spigot end into the socket end, so that the sealing ring 5 is located inside the pipe interface and the second airbag 4 is located outside the pipe interface, with a gap between the sealing ring 5 and the second airbag 4.

[0049] Preferably, before connecting the socket and spigot ends of the pipe, the ash and burrs on the surface of the socket and spigot ends of the pipe are cleaned, and the insertion depth is marked.

[0050] In this embodiment, before installing the second pipe section 2, an annular second airbag 4 and a sealing ring 5 are sequentially fitted onto the spigot end of the second pipe section 2. The sealing ring 5 is a rubber sealing ring. Using hoisting machinery, the spigot end of the second pipe section 2 is inserted into the socket end of the first pipe section 1, so that the sealing ring 5 is located inside the pipe interface and the second airbag 4 is located outside the pipe interface, with an annular gap between the sealing ring 5 and the second airbag 4. After the pipe is installed in place, the second airbag 4 is inserted into the gap of the pipe interface, forming an annular second filling cavity between the socket end and the spigot end.

[0051] S4. Repeat step S3 to complete the installation of subsequent pipe sections;

[0052] S5. Repeat step S2 to complete the installation of the last pipe section;

[0053] S6. Inflate the first airbag 3 and the second airbag 4 so that the first airbag 3 and the second airbag 4 fit into the pipe and seal the pipe joint tightly.

[0054] S7. Inject sealing grout 7 into the first filling cavity and the second filling cavity;

[0055] Prepare sealing grout 7, which is a mixture of cement, water glass, and retarder. Accurately weigh the amounts of cement, water glass, and retarder according to the mixing ratio requirements. After thorough mixing, inject grout using grouting pipe 6. Insert grouting pipe 6 into the gap between the first airbag 3, the second airbag 4, and the pipeline. Grouting pipe 6 is connected to grouting pump 8 via a delivery pipe. A pressure gauge 10 is connected to the delivery pipe to monitor the grouting pressure. The grouting pressure is set to 0.1–0.3 MPa. Through real-time data acquisition and feedback, dynamically adjust the grouting parameters to ensure that the sealing grout 7 is fully filled, forming an effective water-stopping ring in the first and second filling cavities. Construction personnel monitor the grouting pressure and airbag expansion status throughout the process to ensure that each procedure meets design specifications and completes the grouting work at all pipeline joints.

[0056] S8. After the sealing grout 7 has solidified, the first airbag 3 and the second airbag 4 are extracted.

[0057] After the sealing grout 7 has initially set, release all the gas in the first airbag 3 and the second airbag 4 and extract it from the pipe joint. Check the grouting quality of the joint and complete the installation and sealing of the entire pipe section.

[0058] S9. Conduct a water tightness test;

[0059] The water tightness test was conducted in sections according to the requirements of the "Code for Construction and Acceptance of Water Supply and Drainage Pipeline Engineering". After the test head reached the design elevation, the pressure was stabilized for 30 minutes. During the observation period, no leakage was observed at the joints and pipes. The test was considered qualified if the actual leakage was less than or equal to the allowable leakage specified in the code. After each section passed the test, the next section was started. The entire process was recorded with video and images and pressure gauge readings were retained.

[0060] The advantages and positive effects of this invention are:

[0061] 1) Effectively compensates for geometric deviations at pipe joints, improves sealing reliability and impermeability, is easy to construct and repeatable, is suitable for various pipe diameters and complex working conditions, significantly improves the safety and durability of pipeline system operation, and enhances project quality.

[0062] 2) It ensures the sealing performance of pipe joints and improves construction efficiency. After being pressurized, the airbag can evenly transmit pressure, ensuring consistent density of the filling material within the annular gap and effectively preventing leakage caused by local defects. The sealing grout reacts rapidly and has high early strength. Combined with airbag support molding, it significantly shortens the curing cycle and meets the needs of rapid construction.

[0063] The embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. It should be noted that implementations not illustrated or described in the drawings or the main text of the specification are forms known to those skilled in the art and have not been described in detail. Furthermore, the definitions of the various components described above are not limited to the specific structures, shapes, or methods mentioned in the embodiments, and those skilled in the art can easily modify or substitute them.

[0064] The embodiments of the present invention have been described in detail above, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A method for sealing a socket pipe joint using an airbag, characterized in that, Includes the following steps: Install inspection wells; One end of the pipe is inserted into the reserved opening of the inspection well and sealed with a first airbag, forming a first filling cavity between the pipe and the reserved opening; The socket end and spigot end of the pipe are connected and sealed with a second airbag, forming a second filling cavity between the socket end and the spigot end; Inject sealing grout into the first and second filling cavities; After the sealing slurry solidifies, the first and second airbags are removed.

2. The method for sealing a socket pipe interface using an airbag according to claim 1, characterized in that, The step of inserting one end of the pipe into the pre-reserved opening of the inspection well and sealing it with a first airbag to form a first filling cavity between the pipe and the pre-reserved opening includes the following steps: The first airbag is inserted into the insertion end of the pipe, so that the first airbag is located on one side of the reserved opening; Insert the insertion end of the pipe into the reserved hole; The first airbag is inserted into the insertion end of the pipe, so that the first airbag is located on the other side of the reserved hole, and there is a gap between the first airbags.

3. A method for sealing a socket pipe interface using an airbag according to claim 1 or 2, characterized in that, The step of connecting the socket end and spigot end of the pipe and sealing it with a second airbag to form a second filling cavity between the socket end and spigot end includes the following steps: The second airbag and the sealing ring are sequentially inserted into the insertion end; Insert the spigot end into the socket end, so that the sealing ring is located inside the pipe interface and the second airbag is located outside the pipe interface, with a gap between the sealing ring and the second airbag.

4. The method for sealing a socket pipe interface using an airbag according to claim 3, characterized in that: Before connecting the socket end and the spigot end, clean the socket end and the spigot end and mark the insertion depth.

5. A method for sealing a socket pipe interface using an airbag according to any one of claims 1-2 and 4, characterized in that, Before injecting sealing slurry into the first filling cavity and the second filling cavity, the step further includes the following step: inflating the first airbag and the second airbag so that the first airbag and the second airbag fit into the pipe.

6. A method for sealing a socket pipe interface using an airbag according to any one of claims 1-2 and 4, characterized in that: The steps involve injecting sealing grout into the first and second filling cavities, inserting a grouting pipe into the gap between the first and second airbags and the pipe, and injecting the sealing grout through the grouting pipe, which is connected to a grouting pump.

7. A method for sealing a socket pipe interface using an airbag according to claim 6, characterized in that: A pressure gauge is connected between the grouting pipe and the grouting pump to detect the grouting pressure.

8. A method for sealing a socket pipe interface using an airbag according to claim 7, characterized in that: The grouting pressure is set to 0.1–0.3 MPa.

9. A method for sealing a socket pipe interface using an airbag according to claim 6, characterized in that: The sealing grout is a mixture of cement, water glass, and retarder.

10. A method for sealing a socket pipe interface using an airbag according to any one of claims 1-2, 4, and 7-9, characterized in that, The steps for installing the manhole include the following: The inspection wells are installed at both ends of the pipeline; The inspection well was inspected.

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