Tunnel segment joint post-mounted waterproof structure and construction method

Abstract

The application discloses a tunnel segment joint post-mounted waterproof structure and a construction method, relates to the technical field of tunnel segment joint waterproofing, and comprises a first steel-mix combined segment, a second steel-mix combined segment and a third steel-mix combined segment, joint gaps are formed at the joint positions of the first steel-mix combined segment and the second steel-mix combined segment and the joint position of the single combined segment and the third steel-mix combined segment, extrusion guide grooves are arranged on the multiple joint gaps, and elastic sealing strips are embedded in the extrusion guide grooves. The application is provided with an embedded locking structure of a U-shaped embedded groove sealing strip I-shaped compression rib pressing plate, waterproof construction and segment assembly are separated, active quantifiable mechanical pressure is applied to replace passive extrusion, the defects that a traditional pre-embedded waterproof sealing element is prone to being damaged during construction and the sealing effect is uncontrollable are effectively overcome, and the active pressure can effectively adapt to and compensate for small errors in segment assembly, such as a small misalignment, an open mouth or a corner error.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel segment joint waterproofing, in particular to a tunnel segment joint post-mounted waterproof structure and a construction method. BACKGROUND

[0002] Shield method has become the mainstream construction method in the construction of urban subway, highway tunnel and cross-river and sea channel due to its high efficiency, safety, environmental protection and other advantages. Shield tunnel is composed of a ring of prefabricated segments, which can be divided into ordinary reinforced concrete segments, steel segments and steel-concrete composite segments according to the material. Among them, steel-concrete composite segments combine the advantages of steel and concrete, and are increasingly widely used in high water pressure and complex geological conditions. However, regardless of the type of segment, the joint between the segments is always the weakest link in the waterproofing of the entire tunnel structure. In recent years, with the planning and construction of a large number of cross-river and sea tunnels, tunnels need to pass through more complex hydrogeological conditions and bear higher water pressure, and the reliability and durability of joint waterproofing are required to be higher. Once the joint leaks, it will not only erode the structure and affect the normal operation of the equipment, but also cause catastrophic consequences such as structural failure, which poses a serious threat to the safety of the entire life cycle of the tunnel during construction and operation. Therefore, it is very important to study the tunnel joint waterproofing technology.

[0003] At present, the mainstream technology in the industry for segment joint waterproofing is to preset a circumferential groove on the end face of the segment during the prefabrication of the segment; before the segment is assembled, a three-element ethylene propylene diene (EPDM) rubber sealing pad is pasted in the groove by using special glue; finally, when the segment is assembled in the tunnel, the segment is pressed together by the huge thrust of the shield jacks, so that the sealing pad is deformed under pressure to generate high contact stress, thereby achieving waterproofing function. However, the existing technology still has the following problems:

[0004] (1) Difficult to maintain in later period: since the sealing pad is pressed between the two rings of segments, it becomes a permanent concealed work. Once leakage occurs due to material aging, damage, etc., it cannot be checked, repaired or replaced from outside;

[0005] (2) Complex construction steps: the traditional pasting process requires high operation requirements, special glue needs to be applied under clean and dry conditions, and the sealing pad needs to be accurately embedded in the groove, which is a relatively cumbersome process. The pasted sealing pad is easily damaged by collision and scratching during subsequent rough operations such as hoisting, transportation and assembly, which may lead to waterproofing failure. Therefore, careful protection is required, which affects the construction efficiency;

[0006] (3) The waterproof effect is greatly affected by construction errors: the waterproof performance of the traditional method completely depends on the segment assembly accuracy. Once there is a slight error in the assembly process, such as misalignment, opening or corner error, it will cause local compression deficiency or excessive compression of the sealing gasket, resulting in uneven distribution of contact stress, and it is easy to form a leakage channel. This passive compression waterproof mechanism cannot actively compensate for the inevitable errors in construction, resulting in great uncertainty in the reliability of the waterproof effect. SUMMARY

[0007] The purpose of the present application is to provide a tunnel segment joint post-mounted waterproof structure and construction method, which solves the technical problems raised in the above background art.

[0008] To solve the above technical problems, the present application specifically provides the following technical solutions:

[0009] A tunnel segment joint post-mounted waterproof structure, comprising a first steel-concrete composite segment, a second steel-concrete composite segment and a third steel-concrete composite segment, wherein the first steel-concrete composite segment and the second steel-concrete composite segment are spliced to form a single composite segment, the third steel-concrete composite segment is annular, and the junctions of the first steel-concrete composite segment and the second steel-concrete composite segment, and the single composite segment and the third steel-concrete composite segment are all formed with joints, a plurality of extrusion guide grooves are arranged on the joints, the extrusion guide grooves between the first steel-concrete composite segment and the second steel-concrete composite segment are communicated with the extrusion guide grooves between the single composite segment and the third steel-concrete composite segment, one side of the extrusion guide grooves on the first steel-concrete composite segment, the second steel-concrete composite segment and the third steel-concrete composite segment towards the inside of the tunnel, an elastic sealing strip is embedded in the extrusion guide grooves, a pressing plate is pressed on the elastic sealing strip, the pressing plate is arranged on the same side of the outer wall of the first steel-concrete composite segment, the second steel-concrete composite segment and the third steel-concrete composite segment, and a quick fastening joint connected with the pressing plate is arranged at the junction of the first steel-concrete composite segment, the second steel-concrete composite segment and the third steel-concrete composite segment.

[0010] As a preferred embodiment of the present application, one side of the first steel-concrete composite segment, the second steel-concrete composite segment and the third steel-concrete composite segment towards the outside of the tunnel is the joint water-facing side, one side of the first steel-concrete composite segment, the second steel-concrete composite segment and the third steel-concrete composite segment towards the inside of the tunnel is the joint water-backing side, and the extrusion guide grooves are arranged on the joint water-backing side.

[0011] As a preferred embodiment of the present application, the cross section of the extrusion guide groove perpendicular to the length direction of the extrusion guide groove is trapezoidal, and the width of the groove mouth is smaller than the width of the groove bottom.

[0012] As a preferred scheme of the present application, the elastic sealing strip comprises a U-shaped embedding groove and a fitting base, and the U-shaped embedding groove is arranged on the fitting base along the length direction of the fitting base.

[0013] As a preferred scheme of the present application, the top of the U-shaped embedding groove has a circular arc chamfer.

[0014] As a preferred scheme of the present application, the pressing plate comprises an I-shaped pressing rib and a flange plate, the flange plate is matched with the backwater side of the joint and the shape after the two extrusion guide grooves are communicated, the I-shaped pressing rib is integrally formed at the center line of the flange plate and matched with the U-shaped embedding groove.

[0015] As a preferred scheme of the present application, the quick fastening joint comprises a sleeve and a sleeve rod, the sleeve is provided with a snap spring inside, the sleeve is pre-buried on the backwater side of the joint near the edge of the joint, the sleeve rod is fixedly arranged on the flange plate and perpendicular to the surface of the flange plate, and the sleeve rod is clamped and fixed by the snap spring after extending into the sleeve.

[0016] A construction method of a tunnel segment joint rear-mounted waterproof structure, and the specific steps are as follows:

[0017] S100, using tunnel construction equipment, hoisting and pushing the first steel-concrete combined segment, the second steel-concrete combined segment and the third steel-concrete combined segment which are prefabricated and have a sleeve embedded inside in the tunnel to the installation position, adjusting the posture of the first steel-concrete combined segment, the second steel-concrete combined segment and the third steel-concrete combined segment, making the end faces of the first steel-concrete combined segment, the second steel-concrete combined segment and the third steel-concrete combined segment close to each other and finally abutting, and forming a joint with a predetermined width to be processed between the first steel-concrete combined segment, the second steel-concrete combined segment and the third steel-concrete combined segment;

[0018] S200, on the ground or the working platform in the tunnel, taking the elastic sealing strip with a required length and the pressing plate matched therewith, an operator aligns the I-shaped pressing rib of the pressing plate with the U-shaped embedding groove of the elastic sealing strip, applies pressure, and makes the I-shaped pressing rib completely embedded in the U-shaped embedding groove along the length direction of the U-shaped embedding groove to form an integrated waterproof assembly.

[0019] S300, the waterproof assembly pre-assembled in step S200 is carried as a whole to the joint formed in step S100 by an operator manually or using a simple lifting device, the waterproof assembly is placed directly above the joint, the abutting base of the elastic sealing strip is in flat contact with the joint backwater side of the first steel-concrete combined segment, the second steel-concrete combined segment and the third steel-concrete combined segment, then, a vertical downward pressure is applied to the flange plate, the I-shaped compression rib drives the U-shaped embedded groove part of the elastic sealing strip to be compressed into the joint, the position of the waterproof assembly is adjusted to ensure that each sleeve rod of the flange plate is accurately aligned with the opening of the corresponding sleeve embedded in advance;

[0020] S400, after the alignment of all the sleeve rods and the sleeves is completed, a uniform, vertical downward pressure or impact force is applied to the flange plate of the compression plate, the I-shaped compression rib completely compresses the U-shaped embedded groove into the extrusion guide groove, and all the sleeve rods are simultaneously or sequentially compressed into the corresponding sleeves until complete engagement and locking.

[0021] Compared with the prior art, the present application has the following beneficial effects:

[0022] The present application separates the waterproof construction from the segment assembly through the embedded and locked structure of the U-shaped embedded groove sealing strip I-shaped compression rib compression plate, and replaces passive extrusion with active quantifiable mechanical pressure, effectively overcoming the drawbacks of traditional pre-embedded waterproof sealing elements, i.e., easy damage during construction and uncontrollable sealing effect, and actively applying pressure to effectively adapt to and compensate for small errors in assembly, such as misalignment, opening or corner error, during later inspection, repair and replacement, the elastic sealing strip and the compression plate can be disassembled by removing the quick fastening joint, the entire installation process is simpler than the existing technology of pasting sealing pads, improving construction efficiency and reducing labor intensity. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only exemplary, and those skilled in the art can obtain other implementation drawings from the provided drawings without creative labor.

[0024] Figure 1 A schematic diagram of the overall structure of the tunnel segment joint post-mounted waterproof structure of the first embodiment of the present application is provided;

[0025] Figure 2 A partial structure schematic diagram of the quick fastening joint of the first embodiment of the present application is provided;

[0026] Figure 3 A structure schematic diagram of the compression plate of the first embodiment of the present application is provided;

[0027] Figure 4 The structural schematic diagram of the elastic sealing strip provided for the first embodiment of the present application is shown in the figure.

[0028] Figure 5 The structural schematic diagram of the quick fastening joint provided for the first embodiment of the present application is shown in the figure.

[0029] The reference numerals in the figure represent the following respectively:

[0030] 1, first steel-concrete composite segment; 2, joint water-facing side; 3, joint; 4, second steel-concrete composite segment; 5, joint backwater side; 6, sleeve; 7, elastic sealing strip; 701, U-shaped embedded groove; 702, fitting base; 8, sleeve rod; 9, pressing plate; 901, I-shaped pressing rib; 902, flange plate; 10, extrusion guide groove; 11, third steel-concrete composite segment. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0032] The concepts involved in the present application will be described below first with reference to the accompanying drawings. It is pointed out here that the descriptions of the various concepts below are only for the purpose of making the content of the present application easier to understand, and do not represent the limitation on the protection scope of the present application; meanwhile, the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] As Figure 1 and Figure 2As shown, the tunnel segment joint post-mounted waterproof structure provided by the application comprises a first steel-concrete combined segment 1, a second steel-concrete combined segment 4 and a third steel-concrete combined segment 11, the first steel-concrete combined segment 1 and the second steel-concrete combined segment 4 are spliced to form a single combined segment, and the third steel-concrete combined segment 11 is annular, characterized in that a joint 3 is formed at the joint of the first steel-concrete combined segment 1 and the second steel-concrete combined segment 4 and at the joint of the single combined segment and the third steel-concrete combined segment 11, an extrusion guide groove 10 is arranged on each joint 3, the extrusion guide groove 10 between the first steel-concrete combined segment 1 and the second steel-concrete combined segment 4 is communicated with the extrusion guide groove 10 between the single combined segment and the third steel-concrete combined segment 11, one side of the extrusion guide groove 10 on the first steel-concrete combined segment 1, the second steel-concrete combined segment 4 and the third steel-concrete combined segment 11 towards the inside of the tunnel is embedded with an elastic sealing strip 7, a pressing plate 9 is pressed on the elastic sealing strip 7, and the pressing plate 9 is arranged on the same side outer wall of the first steel-concrete combined segment 1, the second steel-concrete combined segment 4 and the third steel-concrete combined segment 11, and a quick fastening joint connected with the pressing plate 9 is arranged at the joint of the first steel-concrete combined segment 1, the second steel-concrete combined segment 4 and the third steel-concrete combined segment 11.

[0034] One side of the first steel-concrete combined segment 1, the second steel-concrete combined segment 4 and the third steel-concrete combined segment 11 towards the outside of the tunnel is a joint water-facing side 2, one side of the first steel-concrete combined segment 1, the second steel-concrete combined segment 4 and the third steel-concrete combined segment 11 towards the inside of the tunnel is a joint backwater side 5, and the extrusion guide groove 10 is arranged on the joint backwater side 5.

[0035] Referring to Figure 5 The quick fastening joint comprises a sleeve 6 and a sleeve rod 8, a snap spring is arranged in the sleeve 6, the sleeve 6 is pre-buried on the edge of the joint backwater side 5 close to the joint 3, the sleeve rod 8 is fixedly arranged on the flange plate 902 and perpendicular to the surface of the flange plate 902, and the sleeve rod 8 is clamped and fixed by the snap spring after extending into the sleeve 6.

[0036] In actual use, the third steel-concrete combined segment 11 is annular, specifically, the first steel-concrete combined segment 1 and the second steel-concrete combined segment 4 are sequentially spliced to form an annular segment, the third steel-concrete combined segment 11 is adjacent to the first steel-concrete combined segment 1 and the second steel-concrete combined segment 4, the sleeve 6 is pre-buried in the first steel-concrete combined segment 1, the second steel-concrete combined segment 4 and the third steel-concrete combined segment 11, and the first steel-concrete combined segment 1, the second steel-concrete combined segment 4 and the third steel-concrete combined segment 11 are hoisted to the installed position and spliced according to the splicing specification, so that the first steel-concrete combined segment 1 and the second steel-concrete combined segment 4 and the single combined segment and the third steel-concrete combined segment 11 form a joint 3 with a predetermined width.

[0037] Subsequently, a corresponding length of the pressing plate 9 and the elastic sealing strip 7 are selected, the pressing plate 9 is matched with the elastic sealing strip 7, and the pressing plate 9 is pressed into the elastic sealing strip 7, so that the pressing plate 9 and the elastic sealing strip 7 form an integrated waterproof assembly, and then the waterproof assembly is hoisted to a position directly above the joint 3, so that the elastic sealing strip 7 contacts the joint backwater side 5 on the first steel-concrete combined segment 1, the second steel-concrete combined segment 4 and the third steel-concrete combined segment 11, and then a vertical downward pressure is applied to the pressing plate 9, so that part of the elastic sealing strip 7 is embedded into the joint 3.

[0038] After all the sleeves 8 and the corresponding sleeves 6 are aligned, a uniform and vertical downward pressure is applied to the pressing plate 9, so that the pressing plate 9 completely extrudes the elastic sealing strip 7 into the extrusion guide groove 10, and all the sleeves 8 are simultaneously or sequentially pressed into the corresponding sleeves 6 until the sleeves 8 are completely locked and fixed in the corresponding sleeves 6 by the snap spring, and the internal snap spring or deformation structure interacts with the inner wall of the sleeve 6 to achieve rapid and firm axial locking, at this time, the installation of the waterproof assembly at the joint 3 between the first steel-concrete combined segment 1, the second steel-concrete combined segment 4 and the third steel-concrete combined segment 11 is completed.

[0039] In the present application, the "rear installation method" construction idea is used as the core, the pressing plate 9 and the elastic sealing strip 7 form an integrated waterproof assembly, the waterproof construction of the tunnel is separated from the first steel-concrete combined segment 1, the second steel-concrete combined segment 4 and the third steel-concrete combined segment 11, and the connection mode of the sleeve 8 and the sleeve 6 is fixed by the snap spring, so that when the segments (i.e. the first steel-concrete combined segment 1, the second steel-concrete combined segment 4 and the third steel-concrete combined segment 11) in the tunnel need to be inspected, repaired and replaced in the later period, since the sleeve 8 and the sleeve 6 are fixed by the snap spring, it is a detachable connection mode, therefore, only the sleeve 8 and the sleeve 6 need to be separated from each other, the entire waterproof assembly (i.e. the waterproof assembly composed of the pressing plate 9 and the elastic sealing strip 7) can be removed, and the later maintenance is facilitated.

[0040] Secondly, compared with the surface treatment, glue coating and pasting and other multi-step construction procedures required in the prior art, the application simplifies the operation steps, improves the construction efficiency and reduces the labor intensity through the quick connection between the sleeve rod 8 and the sleeve 6, and forms an active mechanical pressure through the fixing mode of the sleeve rod 8 being pressed into the sleeve 6 and being clamped by the snap spring, so that an active and quantifiable mechanical pressure can be applied, the traditional passive extrusion is replaced, the problem that the sealing effect is uncontrollable and the sealing gasket is easily damaged during construction due to the pre-pasting of the sealing gasket on the segment in the prior art is effectively solved, and the efficient and reliable compression sealing is ensured through the interference size design of the elastic sealing strip 7 and the extrusion guide groove 10, so that the elastic sealing strip 7 is forced to deform to fill the gap, and when there is a small error in the misalignment, opening or corner of the first steel-concrete combined segment 1 and the second steel-concrete combined segment 4, the elastic sealing strip 7 can effectively adapt to and compensate for these errors through the active application of the sleeve rod 8 and the sleeve 6, so that a reliable sealing effect can be ensured.

[0041] In the embodiment, the joint water side 2 and the joint backwater side 5 refer to different sides of the joint 3, and both belong to the joint 3. The joint water side 2 and the joint backwater side 5 are distinguished by the water side and the backwater side of the joint 3, so as to distinguish the installation positions of the pressing plate 9 and the elastic sealing strip 7.

[0042] The plurality of first steel-concrete combined segments 1 and the second steel-concrete combined segments 4 are sequentially spliced to form a ring-shaped tunnel segment, and the plurality of tunnel segments form a shield tunnel. The joint 3 between the first steel-concrete combined segment 1, the second steel-concrete combined segment 4 and the third steel-concrete combined segment 11 is closed by the plurality of waterproof assemblies composed of the pressing plate 9 and the elastic sealing strip 7.

[0043] The extrusion guide groove 10 is trapezoidal in cross section perpendicular to the length direction of the extrusion guide groove 10, and the width of the groove opening of the extrusion guide groove 10 is smaller than the width of the groove bottom.

[0044] Referring to Figure 4 , the elastic sealing strip 7 comprises a U-shaped embedding groove 701 and a fitting base 702, and the U-shaped embedding groove 701 is arranged on the fitting base 702 along the length direction of the fitting base 702.

[0045] The top of the U-shaped embedding groove 701 has a circular arc chamfer.

[0046] Referring to Figure 3 , the pressing plate 9 comprises an I-shaped pressing rib 901 and a flange plate 902, the flange plate 902 is adapted to the joint backwater side 5 and the shape after the two extrusion guide grooves 10 are communicated, and the I-shaped pressing rib 901 is integrally formed at the center line of the flange plate 902 and is adapted to the U-shaped embedding groove 701.

[0047] The extrusion guide groove 10 provides space and guidance for the subsequent pressing and three-dimensional extrusion of the elastic sealing strip 7.

[0048] When the I-shaped pressing rib 901 presses the U-shaped fitting groove 701 into the corresponding joint 3, the outer wall of the U-shaped fitting groove 701 will be in contact with the inclined side wall in the extrusion guide groove 10. With the locking of the sleeve rod 8 and the sleeve 6, the elastic sealing strip 7 is subjected to a large pressure, so that the fitting base 702 of the elastic sealing strip 7 is tightly pressed against the joint backwater side 5, and the first surface seal is formed. The inclined side wall in the extrusion guide groove 10 will generate a composite extrusion force inward and upward on the U-shaped fitting groove 701, so that the side wall and the top of the U-shaped fitting groove 701 are simultaneously subjected to strong compression, thereby generating a large and multi-directional contact stress, and then realizing the sealing of the joint 3.

[0049] In this embodiment, the elastic sealing strip 7 is preferably made of a high-performance nano-composite rubber material, and the components are as follows in terms of mass percentage: ethylene-propylene-diene rubber 45-65wt%, nano-silicon dioxide 15-25wt%, high wear-resistant carbon black 5-15wt%, graphene 0.5-2wt%, vulcanization system 2-5wt%, protection system 1-3wt%, and processing aid 1-5wt%. The introduction of nano-silicon dioxide and graphene can significantly improve the density, tear resistance and corrosion resistance of the material, so that its service life is far superior to that of traditional ethylene-propylene-diene rubber while maintaining ultra-high elasticity.

[0050] In a preferred embodiment of the present application, the mass percentage of each component is as follows: ethylene-propylene-diene rubber 56.3wt%, nano-silicon dioxide 20wt%, high wear-resistant carbon black 10wt%, graphene 0.5wt%, vulcanization system 4wt%, protection system 2wt%, and processing aid 7.2wt%. The preparation method includes: uniformly blending the components in order on an open mill, and then vulcanizing the final product under certain temperature and pressure after calendering or extrusion molding.

[0051] In this embodiment, the elastic sealing strip 7 can also be made of different elastomer materials, such as nitrile rubber (NBR), chloroprene rubber (CR) or polyurethane elastomer (PU), etc. In order to further enhance its performance, short-cut nylon fibers, aramid fibers and other reinforcing fibers can also be added to the above-mentioned elastomers to improve their tear resistance and extrusion resistance.

[0052] Referring to Figure 4 , the U-shaped fitting groove 701 can also be designed in other shapes, such as V-shaped groove, Ω-shaped groove, or dovetail groove structure with reverse teeth to enhance the engagement force with the pressing rib. In addition, the bottom surface of the fitting base 702 can also not be flat, but can be provided with one or more sealing lips to increase the sealing line and improve the waterproof reliability.

[0053] In the present embodiment, the pressing plate 9 can be made of stainless steel, or can be made of high-strength aluminum alloy to achieve lightweight, or can be made of carbon steel or ductile cast iron treated by hot-dip galvanizing or epoxy coating according to cost and environmental requirements. For special occasions, the pressing plate 9 can also be made of carbon fiber or glass fiber reinforced composite (FRP) to achieve extreme lightweight and corrosion resistance.

[0054] Referring to Figure 3 The cross-sectional shape of the I-shaped pressing rib 901 can also be a solid T-shaped, rectangular, or a hollow box-shaped structure designed to optimize mechanical properties and reduce weight. For nonlinear or large-angle joints 3, the flange plate 902 can be designed as a chain structure connected by multiple short plates through hinged or flexible connectors to better fit the joint 3.

[0055] In the present embodiment, the connection mode of the sleeve 6 and the sleeve rod 8 in the quick fastening joint can also use other forms of quick connection scheme. For example, a bayonet joint that needs to be locked by rotating 90 degrees (similar to the installation method of a camera lens), or a quick plug joint with an elastic buckle that can be automatically locked after insertion. For occasions that require precise control and adjustment of the pressing force, a quick thread with very coarse pitch can also be used (for example, only one to two rotations are required to complete the fastening), which ensures high installation efficiency while providing the ability to adjust the pressure. The above schemes can be used.

[0056] The present application also provides a construction method of a tunnel segment joint post-mounted waterproof structure, and the specific steps are as follows:

[0057] S100, using tunnel construction equipment, hoisting and pushing the first steel-concrete composite segment 1, the second steel-concrete composite segment 4 and the third steel-concrete composite segment 11 with the sleeve 6 buried inside to the installation position in the tunnel, adjusting the posture of the first steel-concrete composite segment 1, the second steel-concrete composite segment 4 and the third steel-concrete composite segment 11, so that the end faces of the first steel-concrete composite segment 1, the second steel-concrete composite segment 4 and the third steel-concrete composite segment 11 are close to each other and finally abutted, forming a joint 3 with a predetermined width between the first steel-concrete composite segment 1, the second steel-concrete composite segment 4 and the third steel-concrete composite segment 11;

[0058] S200, on the ground or working platform in the tunnel, take the required length of elastic sealing strip 7 and the matching pressing plate 9, the operator aligns the I-shaped pressing rib 901 of the pressing plate 9 with the U-shaped embedding groove 701 of the elastic sealing strip 7, applies pressure, and makes the I-shaped pressing rib 901 completely embedded in the U-shaped embedding groove 701 along the length direction, forming an integrated waterproof assembly;

[0059] S300, the waterproof assembly pre-assembled in step S200 is carried by the operator manually or using a simple lifting device to the joint 3 formed in step S100, and the waterproof assembly is placed directly above the joint 3, so that the fitting base 702 of the elastic sealing strip 7 is in flat contact with the joint backwater side 5 of the first steel-concrete combined pipe piece 1, the second steel-concrete combined pipe piece 4 and the third steel-concrete combined pipe piece 11, then a vertical downward pressure is applied to the flange plate 902, so that the I-shaped compression rib 901 drives the U-shaped embedded groove 701 of the elastic sealing strip 7 to be partially pressed into the joint 3, and by adjusting the position of the waterproof assembly, it is ensured that each sleeve rod 8 of the flange plate 902 is accurately aligned with the opening of the corresponding sleeve 6 embedded in advance;

[0060] S400, after the alignment of all the sleeve rods 8 and the sleeves 6 is completed, a uniform, vertical downward pressure or impact force is applied to the flange plate 902 of the pressing plate 9, so that the I-shaped compression rib 901 completely presses the U-shaped embedded groove 701 into the extruded guide groove 10, and all the sleeve rods 8 are simultaneously or sequentially pressed into the corresponding sleeves 6 until complete engagement and locking.

[0061] The above embodiments and / or implementations are only used to illustrate the preferred embodiments and / or implementations of the present application, and do not limit the embodiments of the present application in any form. Any person skilled in the art can make some changes or modifications to other equivalent embodiments without departing from the scope of the technical means disclosed in the present application, but should be considered as the same technology or embodiment as the present application.

[0062] The principles and implementations of the present application are described by using specific examples. The above example is only used to help understand the method and its core idea. The above description is only the preferred embodiment of the present application. It should be pointed out that due to the limitation of language expression, there are infinite specific structures, and for ordinary skilled persons in the technical field, some improvements, refinements or changes can be made without departing from the principles of the present application, and the above technical features can be combined in a proper way. These improvements, refinements, changes or combinations, or the application of the inventive concept and technical solution to other occasions without improvement, should be considered as the protection scope of the present application.

Claims

1. A post-installed waterproof structure for a tunnel segment joint, comprising a first steel-concrete composite segment (1), a second steel-concrete composite segment (4), and a third steel-concrete composite segment (11), and the first steel-concrete composite segment (1) and the second steel-concrete composite segment (4) are spliced to form a single composite segment, and the third steel-concrete composite segment (11) is annular, characterized in that, The joint of the first steel-concrete combined segment (1) and the second steel-concrete combined segment (4), the single combined segment and the third steel-concrete combined segment (11) are formed with a joint (3), a plurality of the joints (3) are provided with an extrusion guide groove (10), the extrusion guide groove (10) between the first steel-concrete combined segment (1) and the second steel-concrete combined segment (4) is communicated with the extrusion guide groove (10) between the single combined segment and the third steel-concrete combined segment (11), the side of the extrusion guide groove (10) on the first steel-concrete combined segment (1), the second steel-concrete combined segment (4) and the third steel-concrete combined segment (11) towards the inside of the tunnel, the extrusion guide groove (10) is embedded with an elastic sealing strip (7), the elastic sealing strip (7) is pressed with a pressing plate (9), and the pressing plate (9) is arranged on the same side of the outer wall of the first steel-concrete combined segment (1), the second steel-concrete combined segment (4) and the third steel-concrete combined segment (11), and the joint of the first steel-concrete combined segment (1), the second steel-concrete combined segment (4) and the third steel-concrete combined segment (11) is provided with a quick fastening joint connected with the pressing plate (9); The elastic sealing strip (7) comprises a U-shaped embedded groove (701) and a fitting base (702), and the U-shaped embedded groove (701) is arranged on the fitting base (702) along the length direction of the fitting base (702); The pressing plate (9) comprises an I-shaped pressing rib (901) and a flange plate (902), the flange plate (902) is matched with the joint backwater side (5) and the shape after the communication of the two extrusion guide grooves (10), and the I-shaped pressing rib (901) is integrally formed at the center line of the flange plate (902) and matched with the U-shaped embedded groove (701).

2. A post-installed waterproofing structure for tunnel segments according to claim 1, characterized in that, The side of the first steel-concrete combined segment (1), the second steel-concrete combined segment (4) and the third steel-concrete combined segment (11) towards the outside of the tunnel is a joint water side (2), the side of the first steel-concrete combined segment (1), the second steel-concrete combined segment (4) and the third steel-concrete combined segment (11) towards the inside of the tunnel is a joint backwater side (5), and the extrusion guide groove (10) is arranged on the joint backwater side (5).

3. The post-applied waterproofing structure for tunnel segments joints according to claim 1, characterized in that, The cross section of the extrusion guide groove (10) perpendicular to the length direction of the extrusion guide groove (10) is trapezoidal, and the width of the groove opening of the extrusion guide groove (10) is smaller than the width of the groove bottom.

4. The post-applied waterproofing structure for tunnel segments joints according to claim 1, characterized in that, The top of the U-shaped embedded groove (701) has a circular arc chamfer.

5. The post-applied waterproofing structure for tunnel segments joints according to claim 1, characterized in that, The quick fastening joint comprises a sleeve (6) and a sleeve rod (8), the sleeve (6) is provided with a clamping spring, the sleeve (6) is pre-buried on the edge of the joint backwater side (5) close to the joint (3), the sleeve rod (8) is fixedly arranged on the flange plate (902) and perpendicular to the surface of the flange plate (902), and the sleeve rod (8) is clamped and fixed in the sleeve (6) after being inserted into the sleeve (6).

6. A method of applying the post-applied waterproofing structure to the tunnel segment joint according to any one of claims 5, characterized in that, The specific steps are as follows: S100, using tunnel construction equipment, hoisting and pushing the first steel-concrete combined segment (1), the second steel-concrete combined segment (4) and the third steel-concrete combined segment (11) with the sleeve (6) pre-installed inside to the installation position in the tunnel, adjusting the posture of the first steel-concrete combined segment (1), the second steel-concrete combined segment (4) and the third steel-concrete combined segment (11), making the end faces of the first steel-concrete combined segment (1), the second steel-concrete combined segment (4) and the third steel-concrete combined segment (11) close to each other and finally abutting, forming a joint (3) to be processed and having a predetermined width between the first steel-concrete combined segment (1), the second steel-concrete combined segment (4) and the third steel-concrete combined segment (11); S200, on the ground or working platform in the tunnel, taking the elastic sealing strip (7) of the required length and the pressing plate (9) matched therewith, the operator aligns the I-shaped pressing rib (901) of the pressing plate (9) with the U-shaped embedding groove (701) of the elastic sealing strip (7), applies pressure, and makes the I-shaped pressing rib (901) completely embedded in the U-shaped embedding groove (701) along the length direction thereof, forming an integrated waterproof assembly; S300, the waterproof assembly pre-assembled in step S200 is manually carried by the operator or using a simple lifting device to the joint (3) formed in step S100, and the waterproof assembly is placed directly above the joint (3), so that the abutting base (702) of the elastic sealing strip (7) is in flat contact with the joint backwater side (5) of the first steel-concrete combined segment (1), the second steel-concrete combined segment (4) and the third steel-concrete combined segment (11), then a vertical downward pressure is applied to the flange plate (902), so that the I-shaped pressing rib (901) drives the U-shaped embedding groove (701) of the elastic sealing strip (7) to be partially pressed into the joint (3), and the position of the waterproof assembly is adjusted to ensure that each sleeve rod (8) of the flange plate (902) is accurately aligned with the opening of the corresponding sleeve (6) pre-installed; S400, after the alignment of all sleeve rods (8) and sleeves (6) is completed, a uniform, vertical downward pressure or impact force is applied to the flange plate (902) of the pressing plate (9), so that the I-shaped pressing rib (901) completely presses the U-shaped embedding groove (701) into the extrusion guide groove (10), and all sleeve rods (8) are simultaneously or sequentially pressed into the corresponding sleeves (6) until complete engagement and locking.

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