Anti-seepage structure of PCCP (prestressed concrete cylinder pipe) connector

Abstract

The utility model relates to an anti-seepage structure of a PCCP (prestressed concrete cylinder pipe) interface, which comprises a socket and a bellmouth which are respectively arranged on two sections of PCCPs, and an insertion gap, the insertion gap comprises a first longitudinal gap, a transverse gap and a second longitudinal gap, and a first elastic potting material, an elastic compression rod and a sealant are sequentially arranged in the second longitudinal gap from inside to outside. According to the utility model, a comprehensive anti-seepage treatment structure combining the high-molecular elastic grouting material, the elastic compression rod and the flexible waterproof layer is adopted, so that a multi-layer waterproof system is constructed, the phenomenon of water leakage at the joint part of the PCCP can be effectively avoided, the durability of the anti-seepage structure is improved, and the repair frequency of the anti-seepage structure is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to PCCP pipeline anti -seepage technical field, concretely relates to a kind of anti -seepage structure of PCCP pipeline interface. BACKGROUND

[0002] Prestressed Concrete Cylinder Pipe, referred to as PCCP, is a new type of rigid pipe material, which can withstand great internal and external pressure, has the advantages of reasonable structure, strong anti-seismic ability, convenient construction, corrosion prevention, easy maintenance and repair, and has been widely used in pressure inverted siphon, urban water supply pipeline, circulating water engineering of power plant, sewer and pressure sewage pipe and other engineering.

[0003] However, after the completion of pipe top backfilling during construction period and the water running process during operation period, PCCP pipeline interface is prone to leakage due to unstable factors such as pipeline ellipticity, insertion gap during installation, foundation change and underground water level change.

[0004] At present, when PCCP pipeline is used, the anti-seepage treatment of its interface part is usually as shown in Chinese invention patent with application number CN201710067391.2, a rubber ring is arranged in the insertion gap of bell and spigot, and epoxy grouting material or polyurethane grouting material is poured into the insertion gap to form a consolidated body, so as to isolate the water exchange between the inside and outside of the pipeline, so as to achieve the purpose of anti-seepage; The disadvantage is that the rubber ring is easy to age, and the consolidated body formed by epoxy grouting material or polyurethane grouting material has high rigidity or hardness, when the pipeline pressure increases and the insertion gap deforms, the anti-seepage structure has poor adaptability to the deformation of the insertion gap, which leads to the inability to effectively isolate the water exchange between the inside and outside of the pipeline. UTILITY MODEL CONTENTS

[0005] The utility model aims at overcoming the defects of poor adaptability of the anti-seepage structure of PCCP pipeline interface to the deformation of insertion gap and poor resistance to external water pressure in the prior art, and provides an anti-seepage structure of PCCP pipeline interface.

[0006] To achieve the above-mentioned purpose, the technical scheme adopted by the utility model is as follows:

[0007] An anti-seepage structure of PCCP pipeline interface, comprising a spigot and a bell respectively arranged on two PCCP pipes, and an insertion gap, the insertion gap comprises a first longitudinal gap, a transverse gap and a second longitudinal gap, and a first elastic grouting material, an elastic compression rod and a sealant are sequentially arranged from inside to outside in the second longitudinal gap.

[0008] As a further technical scheme, a through groove is further arranged on the inner wall of the socket and the spigot, and a flexible waterproof layer is arranged in the groove.

[0009] As a further technical scheme, the flexible waterproof layer is a single-component hand-scratching polyurea waterproof layer, and a fiber-reinforced non-woven fabric is arranged in the single-component hand-scratching polyurea waterproof layer.

[0010] As a further technical scheme, the sealant is a single-component polyurethane sealant.

[0011] As a further technical scheme, the elastic compression rod is an elastic compression rubber rod.

[0012] As a further technical scheme, the elastic compression rubber rod has a compression permanent deformation of less than or equal to 20% under the condition of 70 DEG C x 24h x 25%, and a stress relaxation of less than or equal to 25% under the condition of 20 DEG C x 168h x 25%.

[0013] As a further technical scheme, a separation film layer is further arranged between the elastic compression rod and the sealant.

[0014] As a further technical scheme, the outer wall of the socket and the inner wall of the spigot are both provided with a steel ring, and a plurality of sealing grooves are arranged on at least one of the steel rings, and a sealing rubber ring is arranged in each of the sealing grooves.

[0015] As a further technical scheme, the number of the sealing grooves and the sealing rubber rings is at least two.

[0016] As a further technical scheme, a plurality of punch water injection holes and punch exhaust holes are arranged on the socket in a central symmetry manner, and the punch water injection holes and the punch exhaust holes are arranged between the second gap and the sealing grooves close to the first longitudinal gap.

[0017] As a further technical scheme, a second elastic caulking material is arranged in the punch water injection holes and the punch exhaust holes and the transverse gap.

[0018] As a further technical scheme, the first elastic caulking material and the second elastic caulking material are both high-molecular elastic grouting materials.

[0019] As a further technical scheme, the elastic recovery rate of the high-molecular elastic grouting material is greater than or equal to 90%.

[0020] Compared with the prior art, the utility model has the advantages that:

[0021] 1. The elastic compression rubber rod is embedded in the plug-in gap for caulking sealing, which can adapt to deformation, has a long sealing time, can instantly stop leakage, and can ensure that the PCCP pipeline interface does not leak.

[0022] 2. This utility model selects an environmentally friendly, high elastic recovery rate, and elastic polymer grouting material that can adapt to certain deformations for sealing the joint gaps. It can meet the elastic water-stopping requirements under vibration conditions and seasonal dry and wet alternation environments.

[0023] 3. This utility model adopts a comprehensive anti-leakage treatment structure that combines high-polymer elastic grouting material, elastic compression rod, and flexible waterproof layer to construct a multi-layer waterproof system. It can effectively prevent water leakage at the PCCP pipe joint, improve the durability of the anti-leakage structure, and reduce its repair frequency. Attached Figure Description

[0024] Figure 1 This is a partial structural diagram of the anti-leakage structure of the PCCP pipe interface in one embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the PCCP pipe interface anti-leakage structure from another angle in one embodiment of the present invention;

[0026] Figure 3 This is a construction schematic diagram of the PCCP pipe interface anti-leakage structure in one embodiment of the present invention.

[0027] In the diagram: 1. Insert, 2. Socket, 3. First longitudinal gap, 4. Transverse gap, 5. Second longitudinal gap, 6. First elastic potting compound, 7. Elastic compression rod, 8. Sealant, 9. Single-component hand-scraped polyurea waterproof layer, 10. Fiber-reinforced nonwoven fabric, 11. Steel ring, 12. Sealing rubber ring, 13. Pressure injection hole, 14. Pressure vent hole; 15. Second elastic potting compound, 16. Micro-grouting needle, 17. Isolation membrane layer. Detailed Implementation

[0028] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0029] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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 this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] The present invention will now be described in further detail with reference to the accompanying drawings.

[0032] Figures 1-2 This invention illustrates an embodiment of a leak-proof structure for a PCCP pipe joint, comprising a spigot 1 and a socket 2 respectively disposed on two PCCP pipe sections, and a joint gap. The joint gap includes a first longitudinal gap 3, a transverse gap 4, and a second longitudinal gap 5. Within the second longitudinal gap 5, from the inside out (the end closer to the transverse gap is the inside, and the end farther from the transverse gap is the outside), a first elastic potting compound 6, an elastic compression rod 7, and a sealant 8 are sequentially disposed. This invention uses an elastic compression rubber rod embedded within the joint gap for sealing, which can adapt to deformation, provides a long sealing time, and can immediately stop leaks, ensuring that the PCCP pipe joint does not leak.

[0033] As an embodiment of the anti-leakage structure of the PCCP pipe interface of this utility model, the inner walls of the spigot 1 and the socket 2 are further provided with a through groove, and a flexible waterproof layer is provided in the groove.

[0034] As one embodiment of the anti-leakage structure for a PCCP pipe interface of this utility model, the sealant 8 is a single-component polyurethane sealant 8; in addition, it can also be a single-component polysulfide sealant.

[0035] As an embodiment of the anti-leakage structure of a PCCP pipe interface of this utility model, the flexible waterproof layer adopts Oriental Rainbow SPUA-331 single-component hand-scraped polyurea waterproof layer 9. In addition, it can also adopt a single-component polyurethane waterproof layer.

[0036] As an embodiment of the anti-leakage structure of a PCCP pipe interface of this utility model, the single-component hand-scraped polyurea waterproof layer 9 is provided with fiber-reinforced non-woven fabric 10 inside.

[0037] As an embodiment of the anti-leakage structure of a PCCP pipe interface of this utility model, the elastic compression rod 7 is an Oriental Rainbow Φ30 elastic compression rubber rod.

[0038] As an embodiment of the anti-leakage structure of a PCCP pipe interface of this utility model, the elastic compression rubber rod has a compression permanent deformation of ≤20% under the condition of 70℃×24h×25% and a stress relaxation of ≤25% under the condition of 20℃×168h×25%.

[0039] As an embodiment of the anti-leakage structure of a PCCP pipe interface of this utility model, the elastic compression rod 7 has a smooth surface and multiple porous cavities inside, which facilitates elastic compression.

[0040] As an embodiment of the anti-leakage structure of a PCCP pipe interface of this utility model, an isolation membrane layer 17 is provided between the elastic compression rod and the sealant. The isolation membrane layer 17 is a 0.1mm thick PE film layer used to isolate the elastic compression rod and the sealant.

[0041] As an embodiment of the anti-leakage structure of a PCCP pipe interface of this utility model, the outer wall of the spigot 1 and the inner wall of the socket 2 are both provided with steel rings 11, wherein at least one steel ring 11 is provided with a plurality of sealing grooves, and a sealing rubber ring 12 is provided in the sealing groove.

[0042] As one embodiment of the anti-leakage structure for a PCCP pipe interface of this utility model,

[0043] There are at least two sealing grooves and sealing rubber rings 12.

[0044] The inlet 1 is also provided with a pressure injection hole 13 and a pressure vent hole 14; the pressure injection hole 13 and the pressure vent hole 14 are located between the second gap and the sealing groove near the first longitudinal gap 3.

[0045] As an embodiment of the anti-leakage structure of a PCCP pipe interface of this utility model, the pressure injection hole 13 and the pressure vent hole 14 are arranged in a centrally symmetrical manner with the central axis of the PCCP pipe as the center.

[0046] As an embodiment of the anti-leakage structure of a PCCP pipe interface of this utility model, a second elastic potting compound 15 is provided in the pressure injection hole 13, the pressure vent hole 14 and the transverse gap 4.

[0047] As an embodiment of the anti-leakage structure for a PCCP pipe joint of this utility model, both the first elastic grouting material 6 and the second elastic grouting material 15 are made of polymeric elastic grouting material, and the elastic recovery rate of the polymeric elastic grouting material is ≥90%. This utility model selects an environmentally friendly, high elastic recovery rate, and elastic polymeric grouting material that can adapt to certain deformations for grouting the joint gap, which can meet the elastic water-stopping requirements under vibration conditions and seasonal dry-wet alternation environments. As an embodiment of the anti-leakage structure for a PCCP pipe joint of this utility model, the polymeric elastic grouting material is Oriental Yuhong YH-106 polymeric elastic grouting material.

[0048] Construction method of this utility model:

[0049] The method for constructing a leak-proof structure for a PCCP pipe joint according to this utility model includes the following steps:

[0050] 1) Step 1, Construction during operation: Remove the original caulking material from the splice gap inside the PCCP pipe, clean the dust and dirt from the side wall of the splice gap and the surface of the bottom socket 2 steel ring 11, and keep it clean and dry; Construction during construction: Clean the dust and dirt from the side wall of the splice gap and the surface of the bottom socket 2 steel ring 11, and keep it clean and dry.

[0051] 2) Repair the side wall surface of the interlocking joint by using high-strength fast-setting concrete interface repair mortar to adjust the side wall of the interlocking joint to a flat and regular vertical surface;

[0052] 3) Insert the elastic compression rod 7 into the joint gap using a plugging tool, adjust the position of the elastic compression rod 7 to maintain a grouting filling space of 2-3cm between the elastic compression rod 7 and the bottom wall of the groove, for filling the sealant 8.

[0053] 4) After the elastic compression rod 7 is bent into a ring, its ends are firmly bonded together with neoprene adhesive;

[0054] 5) such as Figure 3 As shown, a micro-grouting needle 16 is vertically inserted into one side of the elastic compression rod 7, and grouting is performed after connecting the grouting pipeline. The grouting fluid is selected from the first elastic grouting material, a high-polymer elastic grouting material. The distance between adjacent micro-grouting needles 16 is 30-50cm, and grouting is performed from low to high. After the original grout emerges from the next micro-grouting needle 16, grouting is stopped, and the needle is moved to the micro-grouting needle 16 where the original grout is emerging for grouting. After grouting is completed, the micro-grouting needles 16 are removed.

[0055] 6) Lay a PE film on the outside of the elastic compression rod 7, and then fill the gap with a single-component polyurethane sealant 8 so that its outer surface is flush with the concrete base.

[0056] 7) Remove the concrete base surface within 15cm on both sides of the joint to form a groove. Apply a 2mm thick single-component hand-applied polyurea coating in the groove to form a single-component hand-applied polyurea waterproof layer 9. Fiber-reinforced non-woven fabric 10 is laid in the middle of the single-component hand-applied polyurea waterproof layer 9.

[0057] 8. Inject the second elastic grouting material, polymer elastic grouting material, into the pressure injection hole 13 as a sealing and strengthening measure. Stop grouting after the grout comes out of the pressure vent hole 14.

[0058] This utility model adopts a comprehensive anti-leakage treatment structure that combines high-polymer elastic grouting material, elastic compression rod 7, and flexible waterproof layer to construct a multi-layer waterproof system. It can effectively prevent water leakage at the PCCP pipe joint, improve the durability of the anti-leakage structure, and reduce its repair frequency.

[0059] The above-described embodiments are merely preferred embodiments of this utility model, and not an exhaustive list of all feasible implementations of this utility model. Any obvious modifications made by those skilled in the art without departing from the principles and spirit of this utility model should be considered to be included within the scope of protection of the claims of this utility model.

Claims

1. A leak-proof structure for a PCCP pipe joint, comprising a spigot (1) and a socket (2) respectively disposed on two PCCP pipe sections, and a spigot joint gap, wherein the spigot joint gap includes a first longitudinal gap (3), a transverse gap (4), and a second longitudinal gap (5), characterized in that, The second longitudinal gap (5) is provided with a first elastic potting compound (6), an elastic compression rod (7) and a sealant (8) arranged sequentially from the inside to the outside.

2. The anti-leakage structure for a PCCP pipe interface according to claim 1, characterized in that, The inner walls of the socket (1) and the receptacle (2) are also provided with through grooves, and a flexible waterproof layer is provided in the grooves.

3. The anti-leakage structure for a PCCP pipe interface according to claim 2, characterized in that, The flexible waterproof layer is a single-component hand-applied polyurea waterproof layer (9) or a single-component polyurethane waterproof layer, and the single-component hand-applied polyurea waterproof layer (9) is provided with fiber-reinforced nonwoven fabric (10) inside.

4. The anti-leakage structure for a PCCP pipe interface according to claim 1, characterized in that, The sealant (8) is either a single-component polyurethane sealant (8) or a single-component polysulfide sealant.

5. The anti-leakage structure for a PCCP pipe interface according to claim 1, characterized in that, The elastic compression rod (7) is made of elastic compression rubber.

6. The anti-leakage structure for a PCCP pipe interface according to claim 1, characterized in that, An isolation membrane layer (17) is also provided between the elastic compression rod and the sealant.

7. The anti-leakage structure for a PCCP pipe interface according to claim 1, characterized in that, The outer wall of the socket (1) and the inner wall of the socket (2) are both provided with steel rings (11), wherein at least one steel ring (11) is provided with a plurality of sealing grooves, and a sealing rubber ring (12) is provided in the sealing groove.

8. The anti-leakage structure for a PCCP pipe interface according to claim 7, characterized in that, The socket (1) is also provided with a pressure injection hole (13) and a pressure vent hole (14) arranged in a centrally symmetrical manner; the pressure injection hole (13) and the pressure vent hole (14) are located between the second gap and the sealing groove near the first longitudinal gap (3).

9. The anti-leakage structure for a PCCP pipe interface according to claim 8, characterized in that, The pressure injection hole (13), the pressure vent hole (14) and the transverse gap (4) are provided with a second elastic potting compound (15).

10. A leak-proof structure for a PCCP pipe interface according to claim 1 or 9, characterized in that, Both the first elastic grout (6) and the second elastic grout (15) are made of polymer elastic grouting material.

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