Low-interference self-forming underground pipeline construction method

Abstract

This invention discloses a low-interference self-forming underground pipeline construction method, comprising: (1) laying the pipeline in the excavated underground passage, wherein the pipeline is made of a water-absorbing and expanding material, and the inner wall of the pipeline is covered with a one-way permeable membrane layer, wherein the one-way permeability means that water in the pipeline can be absorbed and expanded by the membrane layer, but water cannot pass through the membrane layer into the pipeline. (2) then injecting water into the pipeline to make the pipeline absorb water and expand, thereby increasing the pipe diameter. (3) then applying water to the external environment of the pipeline to make the pipeline absorb water from the external environment and expand, thereby further increasing the pipe diameter. (4) adding diphenylmethane diisocyanate water to the water in the pipeline to react and generate gas, thereby further expanding and increasing the pipe diameter; after completion, extracting the liquid and gas in the pipeline, thereby completing the laying of the pipeline. The above method of this invention can minimize the interference with people's daily life, while shortening the construction period and improving construction efficiency.

Description

Technical Field

[0001] This invention relates to the field of underground engineering technology, and in particular to a low-interference self-forming underground pipeline construction method. Background Technology

[0002] The following content in the background art refers only to information related to the present invention as understood by the inventor, and is intended to enhance the understanding of the present invention by explaining some basic technical knowledge related to the present invention. This information does not necessarily constitute knowledge known to those skilled in the art.

[0003] In recent years, my country's urbanization process has been continuously accelerating. Faced with enormous pressure from population, resources, and the environment, and to ensure the sustainable development of the national economy, the Chinese government has been increasing its investment in urban infrastructure year by year, resulting in significant development in urban pipeline construction. However, with the continuous growth of the urban population and the increasing density of urban dwellings, the pressure on traffic has naturally increased. Traffic problems have become the biggest, most urgent, and most serious issue facing the construction and management of large and medium-sized cities in China. Because the renovation, construction, and expansion of urban pipelines require the installation of pipelines within relevant urban areas, the laying of these large-scale transportation facilities necessitates large-scale construction. The excavation of these pipelines, particularly the trenching, affects surface traffic, rendering some areas semi-closed or even completely closed. This significantly impacts traffic conditions, causing congestion, blockages, and even paralysis, inconveniencing the lives and livelihoods of local residents. Furthermore, it severely affects the accessibility of fire-fighting facilities and fire lanes, preventing fire trucks from reaching their destinations in time during fires, thus seriously endangering the lives and property of citizens. Due to the characteristics of traditional excavation techniques, pipeline upgrades, repairs, and expansions all require surface construction. This excavation process generates significant amounts of dust and noise, severely impacting the lives of nearby residents and causing urban environmental pollution. Given the current deteriorating ecological environment and increasing public awareness of environmental protection, coupled with the already polluted urban environment, the large amounts of dust and noise generated by pipeline installation will further exacerbate air and noise pollution, significantly impacting the quality of life for residents.

[0004] Currently, most underground pipeline installations in my country are done using the open-cut method, which has a significant impact on the surrounding environment. Construction sites also require a large number of workers coordinating and operating continuously, resulting in serious noise and pollution. Construction disrupts normal traffic and the daily lives of nearby residents. Traditional underground pipelines use concrete as a construction material, which pollutes the surrounding environment and groundwater, interfering with people's daily lives. Summary of the Invention

[0005] Based on this, the present invention provides a low-interference self-forming underground pipeline construction method, which can minimize disruption to people's daily lives, while shortening the construction period and improving construction efficiency. To achieve the above objectives, the present invention discloses the following technical solution:

[0006] A low-interference, self-forming underground pipeline construction method includes the following steps:

[0007] (1) The pipe is laid in the excavated underground passage. The pipe is made of water-absorbing and expanding material, and the inner wall of the pipe is covered with a one-way permeable membrane layer. The one-way permeability means that the water in the pipe can be absorbed and expanded by the membrane layer, but the water cannot pass through the membrane layer into the pipe.

[0008] (2) Then fill the pipe with water, and after completion, seal both ends of the pipe to allow the pipe to absorb water and expand, thereby further increasing the pipe diameter.

[0009] (3) Then, water is added to the external environment of the pipe, causing the pipe to absorb water from the external environment and expand, thus further increasing the pipe diameter. This step places the inside and outside of the pipe in a liquid water environment at the same time, which can effectively improve the expansion efficiency and effect of the pipe.

[0010] (4) Finally, diphenylmethane diisocyanate (MDI) is added to the water in the pipeline. It reacts with the water to produce gas, which further expands the diameter of the pipeline. After completion, the liquid and gas in the pipeline are extracted, thus completing the laying of the pipeline.

[0011] Furthermore, in step (1), the material of the pipe includes any one of polyvinyl chloride, polyethylene oxide, polypropylene, etc.

[0012] Furthermore, in step (1), the unidirectional permeable membrane layer includes unidirectional permeable geomembrane, etc.

[0013] Furthermore, in step (1), a directional excavator is used to carry the pipeline for excavation, and the pipeline is laid in the underground passage excavated by the directional excavator.

[0014] Furthermore, in step (2), water is injected into the pipe to its limit and then the water injection is stopped so that the pipe can fully absorb water and expand.

[0015] Further, in step (3), water is sprinkled on the soil outside the pipe to allow it to absorb water and expand. The next step begins when the pipe diameter stops changing, as monitored in real time. Optionally, the water spraying rate is 0.3~0.5 m³ per cubic meter of soil. 3 .

[0016] Further, in step (4), diphenylmethane diisocyanate is gradually added to the water in the pipe, and the pipe diameter is monitored in real time until it reaches the set value, at which point the injection of diphenylmethane diisocyanate is stopped.

[0017] Furthermore, in step (4), the gas in the pipeline is first extracted into a gas storage tank, and then the water in the pipeline is extracted into a water tank to reduce environmental pollution.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] As mentioned earlier, traditional underground pipeline installation methods mostly employ open-cut excavation, which has a significant impact on the surrounding environment. Therefore, this invention utilizes a directional excavator to simultaneously excavate the soil and lay the pipeline, thus completing the pipeline installation without open-cut excavation. However, this invention has found that pipelines laid in this way have large gaps between the pipeline and the soil, leading to pipeline instability. To address this, this invention replaces the traditional pipeline with a water-absorbing and expanding pipeline, and covers the inner wall of this pipeline with a one-way permeable membrane layer, laying the foundation for subsequent pipeline expansion and borehole enlargement. Furthermore, after water is injected into the pipeline, it passes through the membrane layer for the pipeline to absorb and expand, increasing the pipeline diameter and compressing the external soil, thus increasing the bond between the pipeline and the soil. However, this invention further finds that due to the limited degree of water absorption and expansion of the pipeline, the bond between the pipeline and the soil is not tight enough. Therefore, this invention utilizes the good toughness of this pipe and reuses the water injected into the pipe. Then, diphenylmethane diisocyanate is added to the pipe, which reacts with the water to produce gas, causing the pipe diameter to expand further. This pipe expansion method effectively overcomes the limitation of the pipe material's limited water absorption and expansion, allowing the pipe to be more tightly compressed and bonded to the external soil, thus fixing the pipe stably and firmly in the soil. Attached Figure Description

[0020] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Hereinafter, embodiments of the invention will be described in detail with reference to the accompanying drawings, wherein:

[0021] Figure 1 The following are schematic diagrams of underground pipeline construction according to the present invention, wherein the reference numerals represent: 1-directional excavator, 2-soil, 3-pipeline, 4-water truck, 5-gas storage tank, and 6-monitoring instrument. Detailed Implementation

[0022] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Experimental methods in the following embodiments, unless otherwise specified, are generally performed under conventional conditions or as recommended by the manufacturer.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of skill in the art. The reagents and raw materials used in this invention are readily available through conventional means, and unless otherwise specified, they shall be used in accordance with conventional methods in the art or as per the product instructions. Furthermore, any methods and materials similar to or equivalent to those described herein may be applied to the methods of this invention. The invention will now be further described with reference to the accompanying drawings and specific embodiments. The preferred embodiments and materials described herein are for illustrative purposes only.

[0024] Example 1

[0025] A low-interference self-forming underground pipeline construction method, refer to Figure 1 It includes the following steps:

[0026] (1) Before construction, a polyvinyl chloride (PVC) pipe 3 is connected to the tail of the directional excavator 1. The directional excavator 1 is a computer-controlled micro directional excavator with a diameter of 10 cm and a length of 40 cm. It can bend freely and has a drill bit at the top to drill into the soil. It is also equipped with a directional positioning device and can still be controlled by the computer at a certain depth of penetration, thus controlling the excavation speed and direction. The inner wall of the PVC pipe is covered with a one-way permeable geomembrane. The one-way permeability means that water in the pipe can be absorbed and expanded by the geomembrane, but water cannot pass through the membrane layer into the pipe.

[0027] (2) The directional excavator 1 is controlled to automatically excavate vertically downwards into the soil 2. When the directional excavator 1 reaches a predetermined depth, vertical excavation stops, and then horizontal excavation begins. Horizontal excavation stops once the pipeline laying length is reached. Then, the directional excavator 1 excavates vertically upwards, and finally, the excavator 1 is removed and recovered. The polyvinyl chloride (PVC) pipeline 3 is laid along the entire planned pipeline route. At this time, the inlet and outlet ports of the PVC pipeline 3 are located at the ports of the two vertical excavation channels, respectively.

[0028] (3) Water is injected into the pipe from the soil inlet and outlet ports of the PVC pipe 3. The water is absorbed by the PVC pipe 3 through the one-way permeable geomembrane on the inner wall of the PVC pipe 3, thereby expanding and increasing the diameter of the PVC pipe 3 to compress the surrounding soil. Water injection is stopped when the limit is reached.

[0029] (4) Seal both ends of the PVC pipe 3 with sealing plates, the sealing plates having temporarily sealed injection ports. Then sprinkle water on the surface of the soil 2 (ground surface) (0.5m water per cubic meter of soil). 3 The process involves the polyvinyl chloride (PVC) pipe 3 absorbing water from the external environment and expanding, thus increasing the pipe diameter. During this process, the monitoring instrument 6 monitors the PVC pipe 3 in real time until the pipe diameter stops changing, at which point the next step begins.

[0030] (5) Open the injection port on the sealing plate and gradually add diphenylmethane diisocyanate (MDI) into the water in the PVC pipe 3. The MDI reacts with the water to generate gas, causing the pipe diameter to expand further. During this process, the pipe diameter of the PVC pipe 3 is monitored in real time by the monitoring instrument 6. When the diameter reaches the set value, the injection of MDI is stopped. Finally, the gas in the PVC pipe 3 is first extracted into the gas storage tank 5, and then the water in the pipe is extracted into the water tank to reduce environmental pollution.

[0031] Example 2

[0032] A low-interference self-forming underground pipeline construction method, refer to Figure 1 It includes the following steps:

[0033] (1) Before construction, a polyethylene pipe 3 is connected to the tail of the directional excavator 1. The directional excavator 1 is a computer-controlled micro directional excavator with a diameter of 10cm and a length of 40cm. It can bend freely and has a drill bit at the top to drill into the soil. It is also equipped with a directional positioning device and can still be controlled by the computer at a certain depth of penetration, thus controlling the excavation speed and direction. The inner wall of the polyethylene pipe is covered with a one-way permeable geomembrane. The one-way permeability means that water in the pipe can be absorbed and expanded by the geomembrane, but water cannot pass through the membrane layer into the pipe.

[0034] (2) The directional excavator 1 is controlled to automatically excavate vertically downwards into the soil 2. When the directional excavator 1 reaches a predetermined depth, vertical excavation stops, and then horizontal excavation begins. Horizontal excavation stops once the pipeline laying length is reached. Then, the directional excavator 1 excavates vertically upwards, and finally, the excavator 1 is removed and recovered. The polyethylene terephthalate (PET) pipe 3 is laid along the entire planned pipeline route. At this time, the inlet and outlet ports of the PET pipe 3 are located at the ports of the two vertical excavation channels, respectively.

[0035] (3) Water is injected into the pipe from the soil inlet and outlet ports of the polyethylene pipe 3. The water is absorbed by the polyethylene pipe 3 through the one-way permeable geomembrane on the inner wall of the polyethylene pipe 3, thereby expanding and increasing the diameter of the polyethylene pipe 3 to squeeze the surrounding soil. Water injection is stopped when the water injection reaches the limit.

[0036] (4) Seal both ends of the polyethylene pipe 3 with sealing plates, the sealing plates having temporarily sealed injection ports. Then sprinkle water on the surface of the soil 2 (ground surface) (0.4m water per cubic meter of soil). 3 The polyethylene pipe 3 absorbs water from the external environment and expands, further increasing its diameter. During this process, the monitoring instrument 6 monitors the pipe diameter of the polyethylene pipe 3 in real time until it stops changing, at which point the next step begins.

[0037] (5) Open the injection port on the sealing plate and gradually add diphenylmethane diisocyanate (MDI) into the water in the polyethylene pipe 3. The MDI reacts with the water to generate gas, causing the pipe diameter to expand further. During this process, the pipe diameter of the polyethylene pipe 3 is monitored in real time by the monitoring instrument 6. When the diameter reaches the set value, the injection of MDI is stopped. Finally, the gas in the polyethylene pipe 3 is first extracted into the gas storage tank 5, and then the water in the pipe is extracted into the water tank to reduce environmental pollution.

[0038] Example 3

[0039] A low-interference self-forming underground pipeline construction method, refer to Figure 1 It includes the following steps:

[0040] (1) Before construction, the acrylic resin pipe 3 is connected to the tail of the directional excavator 1. The directional excavator 1 is a computer-controlled micro directional excavator with a diameter of 10cm and a length of 40cm. It can be bent at will and has a drill bit at the top to drill into the soil. It is also equipped with a directional positioning device and can still be controlled by the computer at a certain depth of penetration, which can control the excavation speed and direction. The inner wall of the acrylic resin pipe is covered with a one-way permeable geomembrane. The one-way permeability means that water in the pipe can be absorbed and expanded by the geomembrane, but water cannot pass through the membrane layer into the pipe.

[0041] (2) Control the directional excavator 1 to automatically excavate vertically downwards into the soil 2. When the directional excavator 1 reaches a predetermined depth, it stops vertical excavation and then proceeds horizontally until the pipeline laying length is reached, at which point horizontal excavation stops. Then, the directional excavator 1 excavates vertically upwards, and finally, the soil is removed and the directional excavator 1 is recovered. The acrylic resin pipe 3 is laid along the entire planned pipeline route. At this time, the soil inlet and outlet ports of the acrylic resin pipe 3 are located at the ports of the two vertical ducts, respectively.

[0042] (3) Water is injected into the pipe from the soil inlet and outlet ports of the acrylic resin pipe 3. The water is absorbed by the acrylic resin pipe 3 through the one-way permeable geomembrane on the inner wall of the acrylic resin pipe 3, thereby expanding and increasing the diameter of the acrylic resin pipe 3 to compress the surrounding soil. Water injection is stopped when the limit is reached.

[0043] (4) Seal both ends of the acrylic resin pipe 3 with sealing plates, the sealing plates having temporarily sealed injection ports. Then sprinkle water on the surface of the soil 2 (ground surface) (0.4m water per cubic meter of soil). 3 The acrylic resin pipe 3 absorbs water from the external environment and expands, further increasing the pipe diameter. During this process, the monitoring instrument 6 monitors the pipe diameter of the acrylic resin pipe 3 in real time until it stops changing, and then the next operation begins.

[0044] (5) Open the injection port on the sealing plate and gradually add diphenylmethane diisocyanate (MDI) to the water in the acrylic resin pipe 3. The MDI reacts with the water to generate gas, causing the pipe diameter to expand further. During this process, the pipe diameter of the acrylic resin pipe 3 is monitored in real time by the monitoring instrument 6. When the diameter reaches the set value, the injection of diphenylmethane diisocyanate is stopped. Finally, the gas in the acrylic resin pipe 3 is first extracted into the gas storage tank 5, and then the water in the pipe is extracted into the water tank to reduce environmental pollution.

[0045] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A low-interference, self-forming underground pipeline construction method, characterized in that, Includes the following steps: (1) The pipe is laid in the excavated underground passage. The pipe is made of water-absorbing and expanding material, and the inner wall of the pipe is covered with a one-way permeable membrane layer. The one-way permeability means that the water in the pipe can be absorbed and expanded by the membrane layer, but the water cannot pass through the membrane layer into the pipe. (2) Then fill the pipe with water, and after completion, seal both ends of the pipe to allow the pipe to absorb water and expand, thereby further increasing the pipe diameter; (3) Then apply water to the external environment of the pipe, so that the pipe absorbs water from the external environment and expands, and the pipe diameter increases further; (4) Finally, diphenylmethane diisocyanate is added to the water in the pipeline. It reacts with the water to produce gas, which further expands the diameter of the pipeline. After completion, the liquid and gas in the pipeline are extracted, thus completing the laying of the pipeline.

2. The underground pipeline construction method according to claim 1, characterized in that, In step (1), the material of the pipe includes any one of polyvinyl chloride, polyethylene oxide, and polypropylene.

3. The underground pipeline construction method according to claim 1, characterized in that, In step (1), the unidirectional permeable membrane layer includes a unidirectional permeable geomembrane.

4. The underground pipeline construction method according to claim 1, characterized in that, In step (1), a directional excavator is used to carry the pipeline for excavation, and the pipeline is laid in the underground passage excavated by the directional excavator.

5. The underground pipeline construction method according to claim 1, characterized in that, In step (2), water injection is stopped when the water level in the pipe reaches its limit.

6. The underground pipeline construction method according to claim 1, characterized in that, In step (3), water is sprinkled on the soil outside the pipe to make the pipe absorb water and expand. When the pipe diameter no longer changes, the next operation begins.

7. The underground pipeline construction method according to claim 6, characterized in that, Sprinkle 0.3-0.5m of water per cubic meter of soil. 3 .

8. The underground pipeline construction method according to claim 1, characterized in that, In step (4), diphenylmethane diisocyanate is gradually added to the water in the pipe, and the pipe diameter is monitored in real time. When the pipe diameter reaches the set value, the injection of diphenylmethane diisocyanate is stopped.

9. The underground pipeline construction method according to any one of claims 1-8, characterized in that, In step (4), the gas in the pipeline is first extracted into the gas storage tank, and then the water in the pipeline is extracted into the water tank.

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