Soft soil stratum curve combined pipe curtain annular sealing waterproof structure and waterproof method thereof

Abstract

The invention discloses a soft soil stratum curve combined pipe curtain annular sealing waterproof structure and a waterproof method thereof, and belongs to the technical field of underground excavation of underground engineering. The annular sealing waterproof structure is arranged to be connected with adjacent pipe joints in a sealing mode according to a preset corner and comprises at least two sets of turning plate assemblies, a water blocking air bag, a self-locking type rubber sealing ring and a pipe roof cushion block. Accurate connection design is conducted on pipe roofs with different curvature radiuses and corners in advance, further, in waterproof design, the turning plate assembly can automatically adjust the bending angle, after being inflated, a water blocking air bag can fill holes in a bell and spigot at will, self-locking rubber sealing rings extrude one another, and the sealing effect is good. The three parts cooperate for waterproofing, so that the sealing performance of the pipe joint connector can be greatly improved, and the problems of water burst and water leakage of the pipe joint connector in the construction process of a curved or linear combined pipe curtain in a soft soil stratum are effectively solved.

Description

Technical Field

[0001] The invention belongs to the technical field of underground engineering dark excavation, and particularly relates to a soft soil stratum curved combined pipe curtain annular sealing waterproof structure and a waterproof method thereof. Background Art

[0002] Under the background of rapid social and economic development, the shortage of urban ground space has become increasingly prominent, and the development and utilization of underground space has become an important direction for urban planning and construction. In this context, the shield method has occupied a prominent position in subway tunnel construction due to its excellent stratum adaptability, efficient excavation speed and high quality of formed tunnels. However, with the continuous improvement of safety and efficiency requirements for subway station construction, traditional shield methods have been unable to meet the high standards of modern construction in some aspects. Therefore, an innovative "tunnel first, station later, circular pipe curtain" method for expanding subway stations came into being and gradually attracted widespread attention in the industry.

[0003] The core steps of the "tunnel first, station later, circular pipe curtain" subway station expansion method are as follows:

[0004] (1) First, the subway tunnel is constructed using the traditional shield method. In the area of ​​the planned subway station, specially designed segments are used for the initial support of the tunnel.

[0005] (2) Secondly, the surrounding soil is reinforced and waterproofed through the grouting holes on the pipe segments to ensure the stability and safety of the construction area.

[0006] (3) Then, holes are opened in the pipe segments, and the prefabricated curved composite pipe curtain is pushed in sections using a pipe curtain machine. After the jacking is completed, the pipe curtain is filled with concrete to form a stable support structure.

[0007] (4) Finally, under the protection of the existing curved composite pipe curtain, the initial supporting segments were removed, and the soil in the area where the subway station is to be built was excavated to complete the expansion of the station.

[0008] Through the above steps, it can be clearly understood that the construction of the annular pipe curtain plays an important role in the entire project, especially in terms of stability and safety during the tunnel excavation stage. In particular, during the segmented jacking process of the annular pipe curtain, the sealing between adjacent pipe sections has a decisive influence on ensuring the safe and efficient jacking of the entire pipe curtain.

[0009] Existing pipe curtains are mostly made of steel. However, due to the relatively thin wall of steel pipes, their stability is insufficient compared to concrete pipe curtains, and they are prone to buckling instability. Therefore, steel pipe curtains are mostly limited to straight pipe curtain construction in practical applications. At present, although some studies have focused on the sealing joint problem of straight pipe curtains, there is still a lack of in-depth discussion on the sealing joint technology of curved combined pipe curtains. Therefore, the current focus should be on solving the design and construction problems of the sealing joints of curved combined pipe curtains to further improve the safety and reliability of this construction method. Summary of the invention

[0010] In order to solve the technical problems existing in the above-mentioned background technology, the present invention provides a soft soil stratum curved combined pipe curtain annular sealing waterproof structure and a waterproof method thereof.

[0011] The present invention adopts the following technical scheme: a soft soil stratum curved combined pipe curtain annular sealing waterproof structure, wherein the annular sealing waterproof structure is configured to seal and connect the spigot end of the Nth pipe section and the socket end of the N+1th pipe section according to a predetermined rotation angle β, wherein N is an integer greater than or equal to 1, and β≤180°;

[0012] The annular sealing and waterproof structure comprises: at least two sets of flap assemblies arranged at a predetermined distance on the outer wall of the plug end and in conflict with the inner wall of the socket end;

[0013] The spigot seal and the socket seal are respectively arranged at designated positions of the outer wall of the spigot end and the inner wall of the socket end; the spigot seal and the socket seal interact and snap together to form a rubber sealing ring, and the rubber sealing ring is a self-locking structure;

[0014] The pipe curtain pad is arranged at the end surface connection of the socket end and the socket end; at least one contact surface of the pipe curtain pad has a predetermined inclination angle α, wherein α=180°-β;

[0015] Connectors are used to simultaneously fasten the pipe curtain pad, the spigot end and the socket end.

[0016] In a further embodiment, the annular sealing waterproof structure further includes:

[0017] A water-blocking airbag is provided at a designated position on the outer wall of the socket end;

[0018] An inflation tube passes through the socket end and is connected to the water-blocking airbag; the inflated water-blocking airbag is used to fill the gap between the socket end and the socket end.

[0019] In a further embodiment, the annular sealing waterproof structure further includes:

[0020] A grease injection tube is inserted at the socket end and located between the two groups of flap assemblies; the grease injection tube is used to fill sealing grease between the two groups of flap assemblies.

[0021] In a further embodiment, the flap assembly comprises:

[0022] A circular ring plate fixed to the outer wall of the socket end;

[0023] A flap is hinged at the edge of the circular plate; the angle between the flap and the circular plate is adjustable;

[0024] The rubber sheet of the cord is connected to the annular plate and the flap at the same time; the end of the rubber sheet of the cord is a raised structure for abutting against the inner wall of the socket end.

[0025] In a further embodiment, the spigot seal and the socket seal have the same structure and are arranged opposite to each other when in use; the spigot seal comprises:

[0026] A connecting portion, arranged on the outer wall of the socket end;

[0027] The extrusion portion is connected to one end of the connection portion at a predetermined angle to form a locking space.

[0028] In a further embodiment, the end surface of the spigot end and the end surface of the socket end are both provided with annular stiffening plates, and the pipe curtain pad is provided between the two sets of annular stiffening plates and fixedly connected by bolts;

[0029] It also includes: a longitudinal stiffening plate vertically connected to the annular stiffening plate.

[0030] In a further embodiment, when β=180°, the soft soil layer combination is a straight line combination, and the thickness B of the pipe curtain pad is 2 .

[0031] In a further embodiment, when β<180°, the soft soil layer combination is a curve combination, and the physical parameters of the pipe curtain pad block should meet the following requirements:

[0032] L=H / cosα

[0033] B 1 =Htanα

[0034] Where H is the longitudinal height of the pipe curtain pad, L is the side length of the contact surface, and B 1 is the extended thickness corresponding to the inclination angle α, then the corresponding thickness of the pipe curtain pad is thickness B 2 and thickness B; where B = B 1 +B 2 .

[0035] The soft soil layer combined pipe curtain annular sealing waterproofing method based on the soft soil layer curved combined pipe curtain annular sealing waterproofing structure as described above comprises the following steps:

[0036] Select the corresponding pipe curtain pad according to the pipe curtain combination type, and adjust the bending angle of the flap assembly according to the curvature radius of the pipe curtain combination;

[0037] The spigot end of the Nth pipe section and the socket end of the N+1th pipe section are butted against each other, and the selected pipe curtain pad is placed at the end face connection between the spigot end and the socket end; during the butt-jointing process, the spigot seal and the socket seal are displaced and moved and squeezed against each other until they are located in the locking space of each other to form a self-locking structure; at the same time, the end of the flap assembly is butted against the inner wall of the socket end, and then the end face of the spigot end, the pipe curtain pad and the end face of the socket end are locked with bolts;

[0038] After the pipe segment is installed, the water-blocking airbag is inflated through the inflation tube to fill the gap caused by the connection of pipe segments with different curvatures; and sealing grease is filled between the two sets of flap assemblies through the grease injection tube to increase the waterproofness between adjacent pipe segments.

[0039] In a further embodiment, the pipe-curtain combination type includes at least a straight line combination type and a curved line combination type; correspondingly, if the pipe-curtain combination type is a straight line combination type, the inclination angle α of the contact surface of the pipe-curtain pad is 0°;

[0040] If the pipe-curtain combination type is a curve combination type, the inclination angle α of the contact surface of the pipe-curtain pad is >0°, α=180°-β, wherein β is the rotation angle between adjacent pipe segments.

[0041] Beneficial effects of the invention: The invention aims to effectively solve the water gushing and water leakage problems during the construction of the curved combined pipe curtain in soft soil by improving the sealing performance of the curved pipe joint. By adopting sealing materials and a self-locking sealing structure, the invention is expected to significantly improve the safety and reliability of the pipe curtain construction.

[0042] Aiming at the complex application of curved pipe curtain in underground engineering, the present invention proposes an innovative pipe curtain structure design and connection technology. The pipe segment itself adopts high-strength steel plate, which is formed into a continuous tubular structure through rolling and welding process, and the circumferential stiffening plate and the longitudinal stiffening plate are welded at the pipe end to form a socket joint. This design not only enhances the structural stability of the pipe curtain, but also facilitates the segmented connection of the pipe curtain.

[0043] Taking into account the difference in curvature radius between the segments of the curved pipe curtain, the present invention pre-designs the pipe curtains and corners with different curvature radii to ensure the continuity and consistency of the pipe curtain in the curved segment. The pipe curtains with different curvature radii are precisely adjusted by pre-selected pipe curtain pads, and then the pipe segment deflection angle is limited by bolt connection to achieve precise segmental connection of the curved pipe curtain.

[0044] In order to ensure the sealing of the gaps at the interfaces between different pipe sections due to different curvature radii, the present invention sets a multiple sealing structure at the socket. Specifically, it includes two flap assemblies, a water-blocking airbag and a rubber sealing ring. The flap assembly is designed to automatically adjust the bending angle according to the curvature radius, and the gap between the two flaps is filled with sealing grease through the grease hole, thereby enhancing the waterproof performance between the pipe sections.

[0045] After the pipe segment is installed, the water-blocking airbag at the socket is inflated through the air injection hole to fill the pores generated by the installation between pipe segments with different curvatures.

[0046] In addition, a rubber sealing ring is provided at the socket end, which is squeezed against the rubber sealing ring at the spigot end to form a self-tightening structure. This structure generates contact pressure during installation to ensure the sealing of the joint. In particular, when the joint is located below the groundwater level, the water pressure acts on the lip of the socket rubber ring, causing it to close and squeeze the rubber pad at the spigot, thereby increasing the contact pressure of the rubber pad at the spigot and further enhancing the sealing effect of the joint.

[0047] The design and construction technology of the present invention not only solves the connection and waterproofing problems of curved pipe curtains at different curvature radii, but also improves the reliability and durability of the pipe curtain joints through the design of a self-tightening structure. It has important theoretical and practical significance for the application of curved pipe curtains in underground engineering. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 This is a cross-sectional view of the multi-combination pipe curtain.

[0049] Figure 2 This is a schematic diagram of the straight pipe curtain installation structure.

[0050] Figure 3 This is a schematic diagram of the curved pipe curtain installation structure.

[0051] Figure 4 It is a structural schematic diagram of the flap assembly.

[0052] Figure 5 It is a schematic diagram of the structure of the socket seal.

[0053] Figure 6 Cross-section of a pipe curtain spacer for use with a straight pipe curtain.

[0054] Figure 7 Cross-section of a pipe curtain spacer used for a curved pipe curtain.

[0055] Figures 1 to 7The labels in are: the Nth pipe section 1, the N+1th pipe section 2, the socket end 3, the socket end 4, the flap assembly 5, the socket seal 6, the socket seal 7, the rubber sealing ring 8, the pipe curtain pad 9, the connecting piece 10, the water-blocking airbag 11, the inflation tube 12, the grease injection tube 13, the annular stiffening plate 14, the longitudinal stiffening plate 15, the straight section stiffening plate 16, the annular plate 501, the flap 502, the curtain rubber plate 503, the connecting part 601, the extrusion part 602, the locking space 603, the first arc surface 602-a, the second arc surface 602-b, and the third arc surface 602-c. DETAILED DESCRIPTION

[0056] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0057] Example 1

[0058] like Figure 1 As shown, when the multi-combination pipe curtain is combined and connected, there are straight sections and curved sections. The curvatures between two adjacent groups of pipe segments in the curved section are different. Therefore, for curved pipe curtains (including straight pipe curtains) with different turning angles, this embodiment discloses a circular sealing waterproof structure of a curved combined pipe curtain for soft soil. Figure 2 The annular sealing and waterproof structure is configured to seal and connect the spigot end 3 of the Nth pipe segment 1 and the socket end 4 of the N+1th pipe segment 2 according to a predetermined rotation angle β, wherein N is an integer greater than or equal to 1, representing the number of the pipe segment, and β≤180°.

[0059] Furthermore, when β=180°, the soft soil layer combination is a straight line combination; when <180°, the soft soil layer combination is a curve combination.

[0060] It is worth mentioning that the two end structures of each pipe segment are the same, namely, a spigot end 3 and a socket end 4, and are correspondingly provided with stiffening plates, and when docked, the spigot end 3 of the Nth pipe segment is matched with the socket end 4 of the N+1th pipe segment and fixed by a connector 10. The connector 10 may be a bolt.

[0061] The annular sealing waterproof structure includes: at least two sets of flap assemblies 5 arranged at a predetermined distance on the outer wall of the socket end 3, and at least two sets of flap assemblies 5 are in conflict with the inner wall of the socket end 4. The number of flap assemblies 5 in this embodiment is two sets.

[0062] A socket seal 6 and a socket seal 7 are respectively arranged at designated positions on the outer wall of the socket end 3 and the inner wall of the socket end 4. The socket seal 6 and the socket seal 7 interact and snap-fit ​​to form a rubber sealing ring 8, and the rubber sealing ring 8 is a self-locking structure.

[0063] In order to adapt to pipe segment combinations with different curvatures, a pipe curtain pad 9 is arranged at the end face connection between the socket end 3 and the socket end 4, wherein the type of the pipe curtain pad 9 is determined according to the requirements and satisfies the following conditions: at least one contact surface of the pipe curtain pad 9 has a predetermined inclination angle α, wherein α=180°-β.

[0064] Furthermore, due to the corners between adjacent pipe sections, a certain gap is created. This gap will affect the sealing between the pipe sections and further affect the waterproof mechanism. Therefore, the annular sealing waterproof structure also includes: a water-blocking airbag 11 provided at a specified position on the outer wall of the socket end 3, and the socket end 3 is provided with an inflation tube 12 connected to the water-blocking airbag 11. The inflated water-blocking airbag 11 is used to fill the gap between the socket end 3 and the socket end 4. After the installation is completed, the water-blocking airbag 11 is inflated through the inflation hole to fill the pores generated by the corner of the pipe curtain.

[0065] Correspondingly, considering that the curvatures of two adjacent groups of pipe segments in the curved surface segment are different, the flap assembly 5 needs to meet the simultaneous contact between the outer wall of the spigot end 3 and the inner wall of the socket end 4 under different curvatures. Figure 4 As shown, the flap assembly 5 comprises: a circular plate 501 fixed to the outer wall of the socket end 3, a flap 502 is hinged at the edge of the circular plate 501, the angle between the flap 502 and the circular plate 501 is adjustable and the positioning connection is achieved through a pin. It also comprises: a cord rubber plate 503 connected to the circular plate 501 and the flap 502, the end of the cord rubber plate 503 is a protruding structure for abutting against the inner wall of the socket end 4.

[0066] It should be noted that the flap assembly 5 used in this embodiment has the following advantages: the annular plate 501 and the stiffening plate are synergistically stressed by welding; when the multi-circular combined pipe curtain is deflected, the elastic potential energy generated by the curtain rubber plate 503 during installation is restored, and the rubber curtain plate drives the flap 502 to fill the gap between the plug and the socket. This adaptive device further improves the waterproof sealing performance of the pipe joint.

[0067] Furthermore, the annular sealing and waterproof structure also includes: a grease injection tube 13 , which is inserted into the socket end 3 and located between the two groups of flap assemblies 5 ; the grease injection tube 13 is used to fill the sealing grease between the two groups of flap assemblies 5 .

[0068] In other words, two flap assemblies 5 are arranged at the socket end 3, and sealing grease is injected through the grease injection hole into the sealing area formed between the two flap assemblies 5 to further enhance the ability to resist water and soil pressure.

[0069] The self-locking structure of this embodiment is realized by the structure of the plug seal 6 and the socket seal 7 being the same and being arranged relative to each other when in use. Figure 5As shown, taking the structure of the socket seal 6 as an example, it includes: a connecting portion 601 arranged on the outer wall of the socket end 3, and an extrusion portion 602 connected to one end of the connecting portion 601, and the connection method can be integrally formed. A predetermined angle is left between the extrusion portion 602 and the connecting portion to form a locking space 603.

[0070] Further integration Figure 5 , the extrusion part 602 and the connection part 601 are connected by the first arc surface 602-a, and the corners of the end of the extrusion part 602 are processed into arc surfaces, namely the second arc surface 602-b and the third arc surface 602-c. During the installation of the socket of the multi-circle combined pipe curtain, in order to improve the installation efficiency and ensure the sealing performance, a layer of lubricating grease is first evenly applied on the rubber sealing ring 8. To reduce the friction resistance during the installation process and prevent the early wear of the sealing ring. Before inserting the socket end 4, the design of the socket seal 6 and the socket seal 7 must meet the requirements of mutual extrusion to form a preliminary sealing effect. After the installation is completed, the elastic deformation parts of the socket seal 6 and the socket seal 7 will gradually recover to form a self-tightening structure. In particular, at the joint part below the groundwater level, the water pressure will act on the lip of the socket rubber ring, prompting it to close and squeeze the rubber pad at the socket, thereby increasing the contact pressure of the rubber pad at the socket. This dynamic sealing mechanism can automatically adjust the sealing performance under the action of water pressure, further enhancing the sealing effect of the joint.

[0071] Therefore, the self-locking structural sealing ring formed by the two sets of relatively clamped sealing members has the following advantages: 1) The inner concave area of ​​the structure is increased, which is convenient for cooperating with another sealing member to form a self-tightening structure, and at the same time, it can produce a larger deformation during installation, which is convenient for actual construction and installation; 2) The first arc surface 602-a of the inner concave part is not easy to produce stress concentration when resisting water and soil pressure; 3) The second arc surface 602-b and the third arc surface 602-c reduce the frictional resistance between the rubber rings during installation, and at the same time, after the self-tightening structure is formed, the rubber ring will not be damaged due to stress concentration at the end; 4) The rubber ring of this cross-section generates a larger force-bearing area for resisting water and soil pressure based on the self-tightening structure under actual force, which reduces surface stress and increases the ability to resist water pressure; 5) The rubber sealing ring 8 is made of polyether polyurethane water-swelling material to ensure that sufficient contact pressure is generated during the self-tightening process, thereby ensuring the sealing of the joint.

[0072] In another embodiment, in combination Figure 6 and Figure 7 According to different pipe-roof combinations, the pipe-roof pad 9 is selected as follows: When β = 180°, the soft soil layer combination is a straight line combination, then the thickness B of the pipe-roof pad 9 is 2 In other words, the pipe curtain pad 9 is a rectangular parallelepiped or a cube.

[0073] Correspondingly, when β<180°, the soft soil layer combination is a curve combination, and the physical parameters of the pipe curtain pad 9 should meet the following requirements:

[0074] L=H / cosα

[0075] B 1 =Htanα

[0076] Where H is the longitudinal height of the pipe curtain pad, L is the side length of the contact surface, and B 1 is the extended thickness corresponding to the inclination angle α, then the corresponding thickness of the pipe curtain pad is thickness B 2 and thickness B; where B = B 1 +B 2 .

[0077] That is, the required corner thickness compensation is given by the contact surface of the pipe curtain pad 9, so as to realize the sealing connection required for the corner.

[0078] In summary, the annular sealing and waterproofing method of the combined pipe curtain proposed in this embodiment is not only applicable to curved pipe curtains, but also to straight pipe curtains. Through two flaps 502, water-blocking airbags 11 and self-tightening rubber sealing rings 8, a multi-layer waterproofing mechanism is formed. Under the premise of meeting the sealing and waterproofing requirements of the curved pipe curtain, the difficulty of on-site construction is reduced and the construction efficiency is increased.

[0079] Example 2

[0080] Based on the soft soil layer curved combined pipe curtain annular sealing waterproof structure disclosed in the embodiment, this embodiment discloses a soft soil layer combined pipe curtain annular sealing waterproof method, including the following steps:

[0081] Select the corresponding pipe curtain pad according to the pipe curtain combination type, and adjust the bending angle of the flap assembly according to the curvature radius of the pipe curtain combination;

[0082] The spigot end of the Nth pipe section and the socket end of the N+1th pipe section are butted against each other, and the selected pipe curtain pad is placed at the end face connection between the spigot end and the socket end; during the butt-jointing process, the spigot seal and the socket seal are displaced and moved relative to each other and squeezed until they are located in each other's locking space to form a self-locking structure; at the same time, the end of the flap assembly is butted against the inner wall of the socket end, and then the end face of the spigot end, the pipe curtain pad and the end face of the socket end are locked with bolts.

[0083] After the pipe segment is installed, the water-blocking airbag is inflated through the inflation tube to fill the gap caused by the connection of pipe segments with different curvatures; and sealing grease is filled between the two sets of flap assemblies through the grease injection tube to increase the waterproofness between adjacent pipe segments.

[0084] Further expansion is made with a specific embodiment as follows: First, the longitudinal stiffening plate is accurately positioned and welded to the inner wall of the pipe curtain. According to the "Code for Acceptance of Construction Quality of Steel Structure Engineering" (GB 50205-2020), welding should be formed in one step to avoid repair welding to ensure the integrity and reliability of the welded joint. Subsequently, the circumferential stiffening plate 14 is welded to the socket end between adjacent longitudinal stiffening plates. According to the "Code for Design of Steel Structures" (GB 50017-2017), the welding nodes should meet the corresponding mechanical properties and structural requirements to ensure the stability and bearing capacity of the welded structure. After welding is completed, the weld should be non-destructively tested. Since there are straight sections in the cross-sectional shape of the multi-circular combined curve pipe curtain, in order to facilitate construction and welding, after the circumferential stiffening plate welding is completed, the straight section is welded with the stiffening plate. To ensure the stability of the connection, the straight section stiffening plate 16 needs to be welded to the inner wall of the pipe curtain and the adjacent circumferential stiffening plates on both sides as a whole to form a continuous reinforcement structure. After welding is completed, a rubber sealing ring is pasted into the groove reserved at the socket end. During the pasting process, the pasting process should be strictly controlled to ensure that the rubber sealing ring and the groove at the socket end are firmly bonded without bubbles or debonding.

[0085] In another embodiment, the longitudinal stiffening plate 15 is precisely positioned and welded to the inner wall of the tube curtain in strict accordance with the design requirements. According to the "Code for Acceptance of Construction Quality of Steel Structure Engineering" (GB 50205-2020), welding should be formed in one step to avoid repair welding to ensure the integrity and reliability of the welded joint. Subsequently, the circumferential stiffening plate and the socket end are welded between adjacent longitudinal stiffening plates. According to the "Code for Design of Steel Structures" (GB 50017-2017), the welding nodes should meet the corresponding mechanical properties and structural requirements to ensure the stability and bearing capacity of the welded structure. After welding is completed, the weld should be non-destructively tested. The flap is welded to the socket through the lower stiffening plate to form a sealing structure at the socket end. After welding is completed, a water-blocking airbag and an inflatable tube are installed in the groove reserved for the socket. The sealing of the inflatable tube interface should meet the design requirements to ensure that there will be no water leakage during construction and use, and to ensure that it forms an effective seal at the socket. Finally, a rubber sealing pad is pasted in the groove reserved at the top of the socket. During the pasting process, the pasting process should be strictly controlled to ensure that the rubber sealing gasket and the groove at the socket end are firmly bonded without bubbles or debonding.

[0086] Before installing the multi-circular combined pipe curtain, for curved pipe curtains with different turning angles, a curved pipe curtain pad matching the pipe curtain angle is welded at the front end of the socket.

[0087] During the installation of the socket of the multi-circle combined pipe curtain, in order to improve the installation efficiency and ensure the sealing performance, first apply a layer of lubricating grease evenly on the rubber sealing ring. This can reduce the friction resistance during the installation process and prevent the early wear of the sealing ring. Before inserting the socket end, the design of the socket seal and the socket seal must meet the requirements of mutual extrusion to form a preliminary sealing effect. The contact between the upper part of the flap assembly and the lower edge of the socket further forms a grease injection edge sealing space. This step helps to fill the possible small gaps and enhance the sealing performance. After the installation is completed, the elastic deformation parts of the socket seal and the socket seal will gradually recover to form a self-tightening structure. In particular, at the joint below the groundwater level, the water pressure will act on the lip of the socket rubber ring, prompting it to close and squeeze the rubber pad at the socket, thereby increasing the contact pressure of the rubber pad at the socket. This dynamic sealing mechanism can automatically adjust the sealing performance under the action of water pressure, further enhancing the sealing effect of the joint.

[0088] Further, the pipe-curtain combination type includes at least a straight line combination type and a curved line combination type; correspondingly, if the pipe-curtain combination type is a straight line combination type, the inclination angle α of the contact surface of the pipe-curtain pad is 0°;

[0089] If the pipe-curtain combination type is a curve combination type, the inclination angle α of the contact surface of the pipe-curtain pad is >0°, α=180°-β, wherein β is the rotation angle between adjacent pipe segments.

Claims

1. The soft soil stratum curved combined pipe curtain annular sealing waterproof structure is characterized by: The annular sealing waterproof structure is configured to seal and connect the spigot end of the Nth pipe section and the socket end of the N+1th pipe section at a predetermined rotation angle β, wherein N is an integer greater than or equal to 1, and β≤180°; The annular sealing and waterproof structure comprises: at least two sets of flap assemblies arranged at a predetermined distance on the outer wall of the plug end and in conflict with the inner wall of the socket end; The spigot seal and the socket seal are respectively arranged at designated positions of the outer wall of the spigot end and the inner wall of the socket end; the spigot seal and the socket seal interact and snap together to form a rubber sealing ring, and the rubber sealing ring is a self-locking structure; The pipe curtain pad is arranged at the end surface connection between the spigot end and the socket end; at least one contact surface of the pipe curtain pad has a predetermined inclination angle α, wherein α=180°-β.

2. The soft soil stratum curved combined pipe curtain annular sealing waterproof structure according to claim 1 is characterized in that: Also includes: Connectors are used to simultaneously fasten the pipe curtain pad, the spigot end and the socket end.

3. The soft soil stratum curved combined pipe curtain annular sealing waterproof structure according to claim 1, characterized in that: The annular sealing waterproof structure also includes: A water-blocking airbag is provided at a designated position on the outer wall of the socket end; An inflation tube passes through the socket end and is connected to the water-blocking airbag; the inflated water-blocking airbag is used to fill the gap between the socket end and the socket end.

4. The soft soil stratum curved combined pipe curtain annular sealing waterproof structure according to claim 1, characterized in that: The annular sealing waterproof structure also includes: A grease injection tube is inserted at the socket end and located between the two groups of flap assemblies; the grease injection tube is used to fill sealing grease between the two groups of flap assemblies.

5. The soft soil stratum curved combined pipe curtain annular sealing waterproof structure according to claim 1, characterized in that: The flap assembly comprises: A circular ring plate fixed to the outer wall of the socket end; A flap is hinged at the edge of the circular plate; the angle between the flap and the circular plate is adjustable; The rubber sheet of the cord is connected to the annular plate and the flap at the same time; the end of the rubber sheet of the cord is a raised structure for abutting against the inner wall of the socket end.

6. The soft soil stratum curved combined pipe curtain annular sealing waterproof structure according to claim 1, characterized in that: The spigot seal and the socket seal have the same structure and are arranged opposite to each other when in use; the spigot seal comprises: A connecting portion, arranged on the outer wall of the socket end; The extrusion portion is connected to one end of the connection portion at a predetermined angle to form a locking space.

7. The soft soil stratum curved combined pipe curtain annular sealing waterproof structure according to claim 1, characterized in that: The end faces of the spigot end and the socket end are both provided with annular stiffening plates, and the pipe curtain pad is arranged between two groups of annular stiffening plates and fixedly connected by bolts.

8. The soft soil layer curved combined pipe curtain annular sealing waterproof structure according to claim 7, characterized in that: Also includes: A longitudinal stiffening plate is vertically connected to the annular stiffening plate.

9. The soft soil stratum curved combined pipe curtain annular sealing waterproof structure according to claim 1, characterized in that: When β=180°, the soft soil layer combination is a straight line combination, and the thickness of the pipe curtain pad is B2.

10. The soft soil stratum curved combined pipe curtain annular sealing waterproof structure according to claim 1, characterized in that: When β is less than 180°, the soft soil layer combination is a curve combination, and the physical parameters of the pipe curtain pad should meet the following requirements: L=H / cosα B1=Htanα In the formula, H is the longitudinal height of the pipe curtain pad, L is the side length of the contact surface, B1 is the extended thickness corresponding to the inclination angle α, and the corresponding thicknesses of the pipe curtain pad are thickness B2 and thickness B respectively; wherein, B=B1+B2.

11. A soft soil layer combined pipe curtain annular sealing waterproofing method based on the soft soil layer curved combined pipe curtain annular sealing waterproofing structure according to any one of claims 1 to 10, characterized in that: The following steps are involved: Select the corresponding pipe curtain pad according to the pipe curtain combination type, and adjust the bending angle of the flap assembly according to the curvature radius of the pipe curtain combination; The spigot end of the Nth pipe section and the socket end of the N+1th pipe section are butted against each other, and the selected pipe curtain pad is placed at the end surface connection between the spigot end and the socket end; During the mutual docking process, the spigot seal and the bell seal are displaced and squeezed against each other until they are located in the locking space of each other to form a self-locking structure; at the same time, the end of the flap assembly abuts against the inner wall of the bell end, and then the end face of the spigot end, the pipe curtain pad and the end face of the bell end are locked by bolts; After the pipe segment is installed, the water-blocking airbag is inflated through the inflation tube to fill the gap caused by the connection of pipe segments with different curvatures; and sealing grease is filled between the two sets of flap assemblies through the grease injection tube to increase the waterproofness between adjacent pipe segments.

12. The soft soil layer combined pipe curtain annular sealing and waterproofing method according to claim 11, characterized in that: The pipe-curtain combination type includes at least a straight line combination type and a curved line combination type; correspondingly, if the pipe-curtain combination type is a straight line combination type, the inclination angle α of the contact surface of the pipe-curtain pad is 0°; If the pipe-curtain combination type is a curve combination type, the inclination angle α of the contact surface of the pipe-curtain pad is >0°, α=180°-β, wherein β is the rotation angle between adjacent pipe segments.

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