Leaking stoppage construction technology applied to underground prefabricated pipe joint splicing point

Abstract

The invention relates to the technical field of waterproof construction, and provides a leaking stoppage construction process applied to underground prefabricated pipe joint splicing points, which comprises the following steps: for each ring end part of a connecting ring, forming a curtain between the ring end part and the peripheral surface of the corresponding end part of a corresponding prefabricated pipe joint; an annular water stop sealing piece is arranged at the splicing point of the two prefabricated pipe joints so as to form a gap between the pipe joints; first slurry is poured into the gaps between the pipe joints until the gaps between the pipe joints are filled with the first slurry; anti-deformation assemblies are arranged at the corresponding ends of the two prefabricated pipe joints and the inner side surfaces of the annular water stop sealing pieces. Through the configuration, the flexible and durable waterproof layer is constructed, the capacity of continuously resisting deformation of a gap between pipe joints is improved, the service life of the leaking stoppage structure is prolonged, and the risk of subsequent possible re-leakage is effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of waterproofing construction technology, and in particular to a leak-sealing construction process applied to the splicing points of underground precast pipe sections. Background Technology

[0002] Common underground precast concrete drainage / diversion pipes typically have pipe sections ranging from 1m to 3m in length. Adjacent sections are connected by sleeves, and the sleeve joints are equipped with multiple rubber sealing strips for waterproofing and leak sealing. However, due to varying bearing capacities of the foundation beneath the pipes, or differences in overhead loads caused by factors such as the compaction of backfill soil and water accumulation, uneven settlement along the length of the pipes is highly likely after a period of time. This can lead to deformation and misalignment of adjacent sections at the joints, ultimately resulting in leakage.

[0003] Most existing leak-sealing solutions use single foamed polyurethane or epoxy resin grouts for emergency treatment. However, foamed polyurethane itself lacks durability and strength, and tends to shrink after a period of time. While epoxy resin grouts have sufficient strength, their ability to adapt to deformation is insufficient, making them unable to withstand significant settlement deformation when used in the joints of underground precast concrete pipe sections. Solutions using a single grouting material have limitations in sealing leaks at joints with large deformation. After the leak-sealing measures are completed, the sealing material continues to be affected by material shrinkage and settlement during subsequent use of the underground pipeline, thus posing a risk of re-leakage. Summary of the Invention

[0004] This invention provides a leak-sealing construction process for underground precast pipe joints, which solves the problem that existing leak-sealing measures cannot simultaneously achieve sufficient durability and strength as well as a certain degree of flexibility to adapt to settlement deformation. This invention achieves a leak-sealing construction process that can effectively seal leaks on the outside of underground pipelines and also form a flexible and durable waterproof layer on the inside to resist deformation.

[0005] This invention provides a leak-sealing construction process for the splicing points of underground precast pipe sections, wherein a connecting ring is provided at the splicing point of any two adjacent precast pipe sections, and the connecting ring covers the outer peripheral surface of the corresponding ends of the two precast pipe sections, comprising the following steps: For each end of the connecting ring, a curtain is formed between the ring end and the outer peripheral surface of the corresponding end of the prefabricated pipe section; An annular water-stop seal is arranged at the splicing point of two prefabricated pipe sections. Along the length of the prefabricated pipe section, the annular water-stop seal is located between the corresponding ends of the two prefabricated pipe sections to form a gap between the pipe sections. Inject the first grout into the gap between the pipe sections until the first grout fills the gap between the pipe sections; Anti-deformation components are provided at the corresponding ends of the two prefabricated pipe sections and on the inner surface of the annular water-stop seal.

[0006] According to the leak-sealing construction process for underground precast pipe section splicing points provided by the present invention, the step of forming a curtain between the outer peripheral surfaces of the ring end and the corresponding end of the corresponding precast pipe section further includes: Several first holes are made radially at the corresponding ends of the two prefabricated pipe sections; Arrange the second grouting tool in each of the first holes; Second grout is injected into the preset positions of the curtain to be formed using various second grouting tools.

[0007] According to the leak-sealing construction process for underground precast pipe joint splicing points provided by the present invention, the second grout is selected from at least one of the following components: acrylate grouting material, ultrafine cement grouting material, and foamed polyurethane grouting liquid.

[0008] According to the leak-sealing construction process for underground precast pipe joints provided by the present invention, when the second grout contains more than one component, a dual-liquid grouting machine is used to load the different components and thereby inject the second grout into the preset position of the curtain to be formed.

[0009] According to the leak-sealing construction process for underground precast pipe section splicing points provided by the present invention, the step of arranging annular water-stop sealing elements at the splicing points of two precast pipe sections further includes: Clean the gaps between the pipe sections that are about to form; Several first grouting tools are arranged on the end surface of the corresponding ends of either of the two precast pipe sections; Install the annular water-stop seal between the corresponding ends of the two prefabricated pipe sections.

[0010] According to the leak-sealing construction process for underground precast pipe section splicing points provided by the present invention, the step of installing the annular water-stop sealant between corresponding ends of two precast pipe sections further includes: A first watertight material is applied to the corresponding ends of the two prefabricated pipe sections and the inner surface of the annular water-stop seal.

[0011] According to the leak-sealing construction process for underground precast pipe section splicing points provided by the present invention, the step of injecting the first grout into the gap between pipe sections further includes: For a number of first grouting tools, the first grout is injected one by one through the corresponding first grouting tool in an upward sequence.

[0012] According to the leak-sealing construction process for underground precast pipe joints provided by the present invention, the first grout is polyurea grout.

[0013] The leak-sealing construction process for underground precast pipe section splicing points provided by the present invention further includes the step of setting anti-deformation components at the corresponding ends of the two precast pipe sections and on the inner surface of the annular water-stop sealant: Remove several primary grouting tools; Grind the corresponding ends of the two prefabricated pipe sections and the inner surface of the annular water-stop seal, and recoat with the first watertight material; Waterproof membrane is applied to the corresponding ends of the two prefabricated pipe sections and the inner surface of the annular water-stop seal.

[0014] According to the leak-sealing construction process for underground precast pipe section splicing points provided by the present invention, the size of the waterproof membrane is larger than the size of the annular water-stop sealant along the length of the precast pipe section; and / or The edges of the waterproof membrane are coated with a second watertight material.

[0015] The leak-sealing construction process for underground precast pipe section splicing points provided by this invention forms a curtain at the ends of each ring of the connecting ring, thereby creating the physical boundary of the leak-sealing structure outside the underground precast pipe section splicing point. This addresses the acute situation of groundwater inflow into underground pipelines in stages, providing construction conditions for subsequent leak-sealing construction steps. Furthermore, by establishing a flexible and durable waterproof layer between two precast pipe sections, including a first waterproof slurry and anti-deformation components on the inner surface, the ability of the gap between the pipe sections to continuously resist deformation is improved, and the service life of the leak-sealing structure is extended, effectively reducing the risk of subsequent re-leakage. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a flowchart of the leak-sealing construction process for underground precast pipe section splicing points provided by the present invention.

[0018] Figure 2 This is a schematic diagram of an existing underground pipeline.

[0019] Figure 3This is a schematic diagram of an underground pipeline under a specific step of the leak-sealing construction process applied to the splicing point of underground prefabricated pipe sections provided by the present invention.

[0020] Figure 4 This is a schematic diagram of an underground pipeline under a specific step of the leak-sealing construction process applied to the splicing point of underground prefabricated pipe sections provided by the present invention.

[0021] Figure 5 This is a schematic diagram of an underground pipeline under a specific step of the leak-sealing construction process applied to the splicing point of underground prefabricated pipe sections provided by the present invention.

[0022] Figure label: 1. First pipe section; 2. Second pipe section; 3. Connecting ring; 4. Curtain; 5. Annular water-stop sealant; 6. First grout; 7. Deformation-resistant component. Detailed Implementation

[0023] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0024] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present 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. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections, wherein a fixed connection can include an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0026] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0027] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0028] The following is combined with Figures 1 to 5 This invention describes a leak-sealing construction process for underground precast pipe joints (hereinafter referred to as "leak-sealing construction process").

[0029] Underground precast concrete drainage / diversion pipes (hereinafter referred to as "underground pipes") are typically composed of multiple pipe sections connected in series, inevitably forming a connection joint between two adjacent pipe sections. In this invention, any two adjacent pipe sections are used as examples to describe the embodiments of the invention in detail, wherein... Figures 2 to 5 The pipe section located on the left is defined as the first pipe section 1, and the pipe section located on the right is defined as the second pipe section 2, for distinction.

[0030] in particular, Figure 2 This is a schematic diagram of an existing underground pipeline system, such as... Figure 2As shown, during the laying of underground precast concrete drainage / diversion pipes, a connecting ring 3 is arranged circumferentially outside the splicing point of the first pipe section 1 and the second pipe section 2. The inner diameter of the connecting ring 3 is larger than the outer diameter of the first pipe section 1 and the second pipe section 2. Thus, the connecting ring 3 acts as a spacer between the first pipe section 1, the second pipe section 2, and the connecting joint between them, and the soil. In other words, the connecting ring 3 becomes the outermost rigid component of the underground pipe facing the soil. Circumferentially, the connecting ring 3 covers the outer circumferential surfaces of the corresponding ends of the two pipe sections, and naturally, it also covers the connecting joint between them.

[0031] If leakage is found at the splicing point of the underground precast cement drainage / diversion pipeline after it is put into use, the leakage sealing construction process of this invention needs to be implemented at the splicing point. Figure 1 This is a flowchart of the leak-sealing construction process applied to the splicing points of underground precast pipe sections, provided by the present invention, such as... Figure 1 As shown, the leak sealing construction process includes at least the following steps: Step S1: For each end of the connecting ring 3, a curtain 4 is formed between the outer peripheral surface of the ring end and the corresponding end of the prefabricated pipe section. Step S2: Arrange annular water-stop seal 5 at the splicing point of the two prefabricated pipe sections. In the length direction of the prefabricated pipe section, the annular water-stop seal 5 is located between the corresponding ends of the two prefabricated pipe sections to form a gap between the pipe sections. Step S3: Inject the first grout 6 into the gap between the pipe sections until the first grout 6 fills the gap between the pipe sections; Step S4: Install anti-deformation components 7 at the corresponding ends of the two prefabricated pipe sections and on the inner surface of the annular water-stop seal 5.

[0032] For step S1, as follows Figure 3 As shown, since the inner diameter of the connecting ring 3 is larger than the outer diameter of the first pipe section 1 and the second pipe section 2, a radial gap is formed between the inner surface of the connecting ring 3 and the corresponding outer peripheral surface of the first pipe section 1 / second pipe section 2 along the entire length of the connecting ring 3. In order to temporarily block the flow of water in the soil from flowing into / leaking into the underground pipe through such a radial gap, it is necessary to form a curtain 4 at each of the two ring ends of the connecting ring 3, so that the curtain 4 closes the radial gap between the ring ends and the corresponding outer peripheral surfaces of the first pipe section 1 / second pipe section 2.

[0033] For step S2, as Figure 4As shown, an annular water-stop seal 5 is arranged at the splicing point of the two prefabricated pipe sections, isolating the internal space of the underground pipeline from the connecting ring 3 and the curtain 4. Along the length of the first pipe section 1 / second pipe section 2 (equivalent to the underground pipeline), the annular water-stop seal 5 is located between the corresponding ends of the first pipe section 1 and the second pipe section 2, i.e., at the location of the joint. Thus, the corresponding ends of the first pipe section 1 and the second pipe section 2, the annular water-stop seal 5, the connecting ring 3, and the two curtains 4 together define the gap between the pipe sections.

[0034] For step S3, continue to refer to... Figure 4 After the gaps between pipe sections are formed, the first grout 6 is injected into the gaps to fill them completely. The selected first grout 6 needs to meet the following requirements: after solidification, it should have a certain degree of elasticity, waterproof performance, corrosion resistance, and wear resistance to be suitable as a filler for the gaps between pipe sections.

[0035] For step S4, as Figure 5 As shown, anti-deformation components 7 are provided at the corresponding ends of the first pipe section 1 and the second pipe section 2, as well as on the inner surface of the annular water-stop seal 5. In other words, on the inner surface of the splice point of the two prefabricated pipe sections, the anti-deformation components 7 cover the annular water-stop seal 5 and the gap between it and the first pipe section 1 / second pipe section 2, thereby providing anti-deformation support from the inner surface for the leak-stopping structure formed by means of this leak-stopping construction process.

[0036] Through the above configuration, a relatively rigid leak-sealing structure is formed on the outside of the splicing point of the underground precast pipe section, thereby temporarily solving the acute situation of groundwater inflow into the underground pipeline and providing construction conditions for subsequent leak-sealing construction processes. In addition, through the above configuration, a flexible and durable waterproof layer is established, namely, including a first slurry 6 (solidified material) with waterproof properties and an anti-deformation component 7 set on the inner surface, which enhances the ability of the gap between pipe sections to continuously resist deformation and extends the service life of the leak-sealing structure, effectively reducing the risk of subsequent possible re-leakage.

[0037] Furthermore, step S1 of the leak-sealing construction process also includes: Step S11: Open several first holes radially at the corresponding ends of the two prefabricated pipe sections; Step S12: Arrange the second grouting tool in each of the first holes; Step S13: Using each of the second grouting tools, inject the second grout into the preset position of the curtain 4 to be formed.

[0038] For step S11, since a curtain 4 needs to be formed at each end of the connecting ring 3, it is necessary to open a series of first holes (not shown in the figure) along the circumference of the pipe walls of the first pipe section 1 and the second pipe section 2 respectively. Preferably, these first holes are distributed at equal intervals along the circumference of the first pipe section 1 / second pipe section 2, for example, the circumferential distance between two adjacent first holes is set in the range of 40cm to 60cm.

[0039] For step S12, a second grouting tool is arranged in each of the first holes. The second grouting tool can be, for example, a grouting needle, thereby passing through the corresponding first hole radially (of the underground pipeline). Accordingly, in order to ensure a tight fit between the second grouting tool and the first hole, the diameter of the first hole can be set to approximately 1.2 cm. After the tip of the second grouting tool passes through the first hole, there is a radial gap between its alignment ring end and the outer peripheral surface of the first pipe section 1 / second pipe section 2.

[0040] For step S13, since a series of first holes are opened circumferentially along the first pipe section 1 / second pipe section 2, preferably, the second grout is injected one by one through the corresponding second grouting tool in an upward sequence, so that a water-stopping curtain 4 is formed between the outer peripheral surfaces of the corresponding ends of each ring end and the corresponding ends of the first pipe section 1 / second pipe section 2. For the grouting process of a single second grouting tool, the criterion for judging whether the amount of second grout injected reaches the preset target amount is that the second grout emerges from the first hole (which has not been injected with second grout) adjacent to the second grouting tool. The above process steps are performed on each first hole / second grouting tool in the above sequence until all first holes / second grouting tools have been completed.

[0041] The above configuration can temporarily prevent groundwater from flowing into underground pipes, providing conditions for subsequent leak-sealing construction processes.

[0042] Furthermore, in step S1, particularly step S13, the second grout used is selected from at least one of the following components: acrylate grouting material, ultrafine cement grouting material, foamed polyurethane grouting liquid, and other suitable materials. The acrylate grouting material is a two-component or multi-component homogeneous liquid grouting material made primarily of acrylate monomer aqueous solution, with the addition of appropriate amounts of crosslinking agent, accelerator, initiator, water, and / or modifier. It is commonly used for seepage prevention and plugging in water conservancy, mining, transportation, industrial and civil construction fields, as well as for soft soil treatment. The ultrafine cement grouting material is an inorganic rigid ultrafine grouting material made from high-strength ultrafine cement, expanding agent, slag, and other additives. Its grout solidifies without shrinkage and has high stone strength, excellent impermeability and durability. The foamed polyurethane is a high-molecular polymer material generated by the reaction of isocyanate and polyol, possessing multiple properties such as lightweight, heat insulation, sound insulation, buffering, and waterproofing.

[0043] In particular, in the event of an acute situation where a relatively large amount of groundwater rushes into the underground pipeline, a rapid-sealing material (i.e., polyurethane foam) can be used to temporarily stop the large influx of water between the outer peripheral surfaces of the corresponding ends of each ring and their respective first pipe section 1 / second pipe section 2. At this time, the polyurethane foam can be applied either by injection or by coating. After the large influx of water is temporarily stopped, a second grout is injected using the second grouting tools until the curtain 4 is formed.

[0044] It is conceivable that after the curtain 4 is formed, each of the second grouting tools is removed from the corresponding first hole, and then each of the first holes is sealed.

[0045] Furthermore, in step S1, and particularly in step S13, when the second grout used contains more than one component, a dual-liquid grouting machine is used to load the different components and thereby inject the second grout into the preset positions of the curtain 4 to be formed (i.e., each first hole / second grouting tool). The dual-liquid grouting machine can simultaneously handle the delivery of multiple media and supports grouting operations of single-component or two-component grouts.

[0046] Furthermore, step S2 of the leak-sealing construction process also includes: Step S21: Clean the gaps between the pipe sections that are about to form; Step S22: Arrange a number of first grouting tools on the end surface of the corresponding ends of either of the two precast pipe sections; Step S23: Install the annular water-stop seal 5 between the corresponding ends of the two prefabricated pipe sections.

[0047] For step S21, during the laying of underground pipelines, some waste may accumulate on the outer surface of each prefabricated pipe section. Therefore, before forming a closed gap between pipe sections, it is necessary to clean / remove all this waste, such as debris, contaminants, and fragments, outside the gap between pipe sections; even, detergents, such as water or cleaning agents, can be used to rinse the gap between pipe sections to be formed and the connection joint between the first pipe section 1 and the second pipe section 2.

[0048] For step S22, a plurality of first grouting tools (e.g., grouting needles) are arranged on the edge of the annular water-stop seal 5 to be installed in place. Therefore, before the annular water-stop seal 5 is installed in place, the plurality of first grouting tools can be arranged on the end surfaces of the corresponding ends of the first pipe section 1 or the second pipe section 2. In particular, each of the plurality of first grouting tools extends substantially radially (of the underground pipeline). Preferably, these first grouting tools are distributed at equal intervals circumferentially; for example, the circumferential spacing between two adjacent first grouting tools is set in the range of 50 cm to 100 cm.

[0049] For step S23, the annular water-stop seal 5 can be made of rubber, thus allowing for a certain degree of deformation. This annular water-stop seal 5 is installed / embedded into the joint between the first pipe section 1 and the second pipe section 2. Preferably, the annular water-stop seal 5 is interference-fitted with the two prefabricated pipe sections, so that the annular water-stop seal 5 is securely clamped between them. Alternatively, the installation of the annular water-stop seal 5 can be performed only after the cleaned joint between the pipe sections has completely dried.

[0050] The advantage of this configuration is that, unlike step S11 above, there is no need to open holes in the pipe wall of the first pipe section 1 / second pipe section 2 in order to arrange the first grouting tool. This eliminates the associated process steps of opening holes and subsequently resealing them, and also reduces the necessity of forming structural gaps in the pipe wall of each precast pipe section.

[0051] Furthermore, step S23 of the leak-sealing construction process also includes: Step S231: Apply a first watertight material to the corresponding ends of the two prefabricated pipe sections and the inner surface of the annular water-stop seal 5.

[0052] In step S231, even though the annular water-stop seal 5 is interference-fitted with the two prefabricated pipe sections, gaps inevitably remain between the annular water-stop seal 5 and the first pipe section 1 / second pipe section 2. To prevent leakage from such narrow gaps, after the annular water-stop seal 5 is installed, a first watertight material, such as epoxy repair putty or other suitable material, is applied to a relatively large area of ​​the aforementioned inner surface. With this configuration, the joint is largely sealed by the annular water-stop seal 5, while the narrower gaps are sealed by the applied first watertight material.

[0053] Furthermore, step S3 of the leak-sealing construction process also includes: For a number of first grouting tools, the first grout 6 is injected one by one through the corresponding first grouting tool in an upward sequence.

[0054] Similar to step S13 above, for a series of first grouting tools arranged circumferentially along the first pipe section 1 / second pipe section 2, preferably, the first grout 6 is injected one by one through the corresponding first grouting tool in an upward sequence. For the grouting process of a single first grouting tool, the criterion for judging whether the amount of first grout 6 injected reaches the preset target amount is that the first grout 6 appears in the observation hole adjacent to the first grouting tool. The observation hole can be another first grouting tool adjacent to the first grouting tool, or it can be an independent observation hole opened by the construction workers on the first pipe section 1, the second pipe section 2, or the annular water-stop seal 5.

[0055] Furthermore, in step S3, the first grout 6 used can be polyurea grout or other suitable materials. As mentioned above, the first grout 6 needs to meet the following requirements: after solidification, it should possess a certain degree of elasticity, waterproof performance, corrosion resistance, and wear resistance. As an example, polyurea precisely meets the above conditions to accommodate the relatively large gaps at the splicing points (i.e., gaps between pipe sections) and long-term continuous deformation.

[0056] Furthermore, step S4 of the leak-sealing construction process also includes: Step S41: Remove several first grouting tools; Step S42: Grind the corresponding ends of the two prefabricated pipe sections and the inner surface of the annular water-stop seal 5, and recoat with the first watertight material. Step S43: Install waterproof membrane at the corresponding ends of the two prefabricated pipe sections and on the inner surface of the annular water-stop seal 5.

[0057] In step S41, the first grouting tool has been tightly compacted by the annular water-stop seal 5, the first pipe section 1 or the second pipe section 2, and the first grout 6 in the first grouting tool. Although the first grouting tool can also be removed by pulling it out, it is preferable that the part of the first grouting tool protruding from the inner surface can be cut off by means of a cutting tool.

[0058] For step S42, the corresponding ends of the first pipe section 1 and the second pipe section 2 are ground so that the inner surfaces of the corresponding ends of the two prefabricated pipe sections are substantially flush with the inner surface of the annular water-tight seal 5. Then, the aforementioned first watertight material is recoated onto the respective inner surfaces of the two prefabricated pipe sections and the annular water-tight seal 5. This is because the grinding sub-step of this process may consume / remove a portion of the first watertight material applied in step S231 above, so as to replenish the first watertight material on the inner surfaces to the predetermined thickness.

[0059] Preferably, the first watertight material being recoated is not a single-layer structure, but a sandwich structure. Specifically, a certain amount of the first watertight material is first coated on the surface to be polished; then, fiberglass cloth is laid on the surface of the first watertight material as a reinforcing base; finally, a certain amount of the first watertight material is coated again on the reinforcing base, thereby forming a sandwich structure of "first watertight material - reinforcing base - first watertight material".

[0060] For step S43, after applying the first watertight material, a waterproof membrane, such as a butyl self-adhesive polymer waterproof membrane, is applied to the surface exposed to the inside of the underground pipe. The waterproof membrane covers the annular water-stop seal 5 and the narrow gaps at both ends. In other words, the waterproof membrane constitutes the main body of the deformation-resistant component 7.

[0061] With the above configuration, the leak-sealing structure formed by this leak-sealing construction process receives relatively rigid support from the anti-deformation component 7, thereby improving the leak-sealing structure's ability to continuously resist deformation and extending its service life.

[0062] Furthermore, in step S43 above, the size of the waterproof membrane is larger than the size of the annular waterstop seal 5 along the length of the prefabricated pipe section. For example, the annular width of the waterproof membrane can be larger than the annular width of the joint / annular waterstop seal 5, with a size difference of approximately 400 mm. In other words, at either end along the length, the edge of the waterproof membrane extends approximately 200 mm beyond the edge of the annular waterstop seal 5.

[0063] Additionally, the edges of the waterproof membrane are coated with a second watertight material, such as a polyurea coating. Thus, the sandwich structure, the waterproof membrane, and even the optional second watertight material constitute the deformation-resistant component 7 disposed on the inner surface.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A leak-sealing construction technique applied to the splicing points of underground precast pipe sections, wherein, A connecting ring is provided at the splicing point of any two adjacent prefabricated pipe sections, the connecting ring covering the outer peripheral surface of the corresponding ends of the two prefabricated pipe sections, characterized by including the following steps: For each end of the connecting ring, a curtain is formed between the outer peripheral surface of the end of the ring and the corresponding end of the prefabricated pipe section; An annular water-stop seal is arranged at the splicing point of the two prefabricated pipe sections. In the length direction of the prefabricated pipe section, the annular water-stop seal is located between the corresponding ends of the two prefabricated pipe sections to form a gap between the pipe sections. Inject the first grout into the gap between the pipe sections until the first grout fills the gap between the pipe sections; Anti-deformation components are provided at the corresponding ends of the two prefabricated pipe sections and on the inner surface of the annular water-stop seal.

2. The leak-sealing construction process applied to the splicing points of underground precast pipe sections according to claim 1, characterized in that, The step of forming a curtain between the outer peripheral surfaces of the ring end and the corresponding end of the precast pipe section further includes: Several first holes are respectively opened radially at the corresponding ends of the two prefabricated pipe sections; A second grouting tool is arranged in each of the first holes; The second grout is injected into the preset position of the curtain to be formed using each of the second grouting tools.

3. The leak-sealing construction process applied to the splicing points of underground precast pipe sections according to claim 2, characterized in that, The second grout is selected from at least one of the following components: acrylate grouting material, ultrafine cement grouting material, and foamed polyurethane grouting liquid.

4. The leak-sealing construction process applied to the splicing points of underground precast pipe sections according to claim 3, characterized in that, When the second slurry contains more than one component, the different components are loaded using a two-liquid grouting machine, and the second slurry is then injected into the predetermined position of the curtain to be formed.

5. The leak-sealing construction process applied to the splicing points of underground precast pipe sections according to claim 1, characterized in that, The step of arranging annular water-stop seals at the splicing points of the two prefabricated pipe sections further includes: Clean the gaps between the pipe sections that are about to form; A plurality of first grouting tools are arranged on the end surface of the corresponding ends of either of the two precast pipe sections; The annular water-stop seal is installed between the corresponding ends of the two prefabricated pipe sections.

6. The leak-sealing construction process applied to the splicing points of underground precast pipe sections according to claim 5, characterized in that, The step of installing the annular water-stop seal between the corresponding ends of the two prefabricated pipe sections further includes: A first watertight material is applied to the corresponding ends of the two prefabricated pipe sections and to the inner surface of the annular water-stop seal.

7. The leak-sealing construction process applied to the splicing points of underground precast pipe sections according to claim 5, characterized in that, The step of injecting the first grout into the gap between the pipe sections further includes: For a plurality of the first grouting tools, the first grout is injected one by one through the corresponding first grouting tool in an upward sequence.

8. The leak-sealing construction process applied to the splicing points of underground precast pipe sections according to claim 1 or 7, characterized in that, The first grout is a polyurea injection grout.

9. The leak-sealing construction process applied to the splicing points of underground precast pipe sections according to claim 6, characterized in that, The step of providing anti-deformation components at the corresponding ends of the two prefabricated pipe sections and on the inner surface of the annular water-stop seal further includes: Remove several of the first grouting tools; Grind the corresponding ends of the two prefabricated pipe sections and the inner surface of the annular water-stop seal, and recoat the first watertight material. Waterproof membrane is applied to the corresponding ends of the two prefabricated pipe sections and to the inner surface of the annular water-stop seal.

10. The leak-sealing construction process applied to the splicing points of underground precast pipe sections according to claim 9, characterized in that, Along the length of the prefabricated pipe section, the size of the waterproof membrane is larger than the size of the annular water-stop seal; and / or The edges of the waterproof membrane are coated with a second watertight material.

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