Water-stop belt structure assembly for tunnel lining segment joint and construction method of water-stop belt structure assembly

Abstract

The invention provides a water-stop belt structure assembly for a tunnel lining segment joint and a construction method of the water-stop belt structure assembly. The water-stop belt structure assembly comprises a water-stop belt main body and a sensing device, the water stop belt body is provided with a wrinkled inner layer and a latticed outer layer, the extending direction of the wrinkles of the inner layer is parallel to the long axis direction of the tunnel body, the outer layer covers the outer side of the inner layer and is connected to the wave crest of the inner layer, and the front edge and the rear edge of the inner layer and the front edge and the rear edge of the outer layer are connected to the tunnel body respectively; the sensing device is arranged on the inner side of the inner layer and used for sensing the strain and leakage conditions of the inner layer. The water stop belt body has the long service life, whether the inner layer is torn and leaks or not can be accurately judged, maintenance can be conveniently carried out before serious accidents happen, and the later use safety is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel engineering, and in particular relates to a water stop strip structure assembly for tunnel lining segment joints and a construction method thereof. Background Art

[0002] With the development of economy and the progress of society, important basic transportation facilities such as highways, railways and subways have become important links connecting various regions. In order to ensure the convenience of people's travel, the construction and operation and maintenance of transportation facilities face higher requirements. There are many tunnels on the transportation routes in some mountainous areas. In order to ensure the safety of tunnels, the problem of water leakage in tunnels needs to be paid special attention.

[0003] Tunnel water leakage refers to the phenomenon that groundwater enters the tunnel through the tunnel surrounding rock or structural gaps due to the water pressure difference between the inside and outside of the tunnel. When groundwater penetrates into the tunnel through rock or soil, it may cause problems such as water flow, dripping or water vapor, thereby affecting the use and structural safety of the tunnel. Complex and changeable geological conditions, old tunnels, unreasonable designs, poor construction quality, and sudden natural disasters may all lead to tunnel water leakage.

[0004] Tunnel water leakage may lead to a series of serious consequences, including floods and mudslides, structural damage and collapse, traffic accidents and equipment failures. Therefore, it is crucial to prevent and control tunnel water leakage. The catastrophic impact of tunnel lining water leakage on tunnel structure and driving safety is analyzed from multiple angles. In terms of structural integrity, water leakage may accelerate the corrosion of tunnel lining, leading to concrete peeling and steel corrosion, which in turn affects the bearing capacity of tunnel structure. In cold areas, the infiltrated water freezes inside the tunnel lining, and the frost heave effect may cause cracks or lining damage, or even partial or complete collapse. In terms of driving safety, water leakage may make tunnel roads slippery and increase the risk of tire skidding. For example, water leakage forms water accumulation on the carriageway, which may cause the vehicle to lose control and cause a traffic accident. Water leakage may also form dripping or waterfall-like water flows in the tunnel, which may blur the road surface. The driver's line of sight further increases the danger of driving; in terms of the safety of the electrical system inside the tunnel, the tunnel is equipped with electrical systems such as lighting, communication, monitoring, and fire protection. Water seepage may cause short circuits or even fires. Long-term water penetration accompanied by salt erosion will also accelerate the aging of equipment such as cables and increase the failure rate; in terms of maintenance and operating costs, water leakage problems require frequent patching and repairs, which not only increases maintenance costs, but may also require traffic control due to construction, thereby affecting traffic efficiency. For example, the tunnel may need to be partially closed during maintenance, resulting in traffic congestion and transportation delays. In addition, frequent maintenance work will also affect the overall operation of the tunnel and increase management difficulty and costs.

[0005] In summary, tunnel water leakage not only poses a serious threat to tunnel structure and driving safety, but also significantly increases the cost of maintenance and operation. Therefore, taking effective prevention and control measures to ensure the safety and stability of the tunnel is an important link that cannot be ignored in tunnel engineering.

[0006] In order to effectively deal with the problem of tunnel leakage, the existing construction measures mainly include the following aspects: First of all, it is reasonable geological survey and site selection. Before tunnel construction, detailed geological survey is crucial. By comprehensively evaluating geological conditions and determining potential risks and construction difficulties, reliable data support can be provided for design and construction. Geological survey includes information on geological structure, groundwater distribution, soil and rock properties. These data are helpful for scientific site selection, avoiding areas with serious leakage risks, or considering corresponding protective measures in the design stage. Secondly, the waterproofing measures of the tunnel, according to the geological conditions and the specific conditions of the tunnel, adopt a variety of waterproofing technologies to reduce or prevent the entry of seepage water, these technologies include, grouting: during the tunnel construction process, the surrounding rock is reinforced by grouting technology to close the possible seepage channel; shotcrete: spraying a concrete layer on the tunnel wall to form a dense waterproof barrier; tunnel lining: using materials with excellent waterproof performance for tunnel lining to ensure the integrity and waterproofness of the tunnel structure; then monitoring and maintenance, regular monitoring of the built tunnel, can timely detect water leakage problems and take corresponding measures, these monitoring measures include installing sensors and regular inspections to ensure that any leakage problems are discovered and solved at an early stage; for old tunnels, necessary reinforcement and transformation are carried out to improve their waterproof performance and structural safety. Finally, formulate an emergency plan, formulate an emergency plan for tunnel leakage, so that when problems occur, appropriate measures can be taken quickly to ensure the safety of personnel and the normal operation of the tunnel; the emergency plan includes emergency response procedures, personnel evacuation plans, emergency repair measures, etc., to ensure that problems can be handled efficiently and orderly in emergencies and minimize losses. These comprehensive measures can be used to effectively address the problem of tunnel water leakage, thereby ensuring the safety and stability of the tunnel.

[0007] Among the tunnel waterproofing measures, tunnel waterstop is a key waterproof sealing material specially used in tunnel engineering. Its main function is to keep the tunnel dry and safe, prevent groundwater from entering the tunnel structure, and avoid negative impacts on tunnel use and structural stability. In addition, the waterstop can prevent the infiltration of soil and rock particles, further protecting the tunnel lining and internal facilities. Once the waterstop used in existing projects is damaged or aged, it is relatively difficult to maintain, and its service life is short, and its long-term effectiveness is difficult to guarantee, resulting in high maintenance costs in the later stage. Summary of the invention

[0008] An embodiment of the present invention provides a waterstop structure assembly for tunnel lining segment joints, aiming to solve the problem that the existing waterstop has a short service life and causes high use costs.

[0009] To achieve the above object, the technical solution adopted by the present invention is: In a first aspect, a waterstop structure assembly for a tunnel lining segment joint is provided, comprising: The water stop strip body comprises a corrugated inner layer and a grid-shaped outer layer, wherein the corrugation direction of the inner layer is parallel to the long axis direction of the tunnel body, the outer layer covers the outer side of the inner layer and is connected to the crest of the inner layer, and the front and rear edges of the inner layer and the front and rear edges of the outer layer are respectively connected to the tunnel body; The sensing device is arranged on the inner side of the inner layer and is used for sensing the strain and leakage of the inner layer.

[0010] In combination with the first aspect, in a possible implementation manner, the outer layer is a steel mesh component, and the inner layer is a rubber component.

[0011] In some embodiments, the inner layer and the outer layer are bonded together.

[0012] In combination with the first aspect, in a possible implementation, the sensing device includes an optical fiber and a fiber grating sensor, the optical fiber is laid along the length direction of the inner layer, and the fiber grating sensor is arranged on the optical fiber.

[0013] In some embodiments, a plurality of the fiber grating sensors are provided, and the plurality of the fiber grating sensors are evenly distributed along the extension direction of the optical fiber.

[0014] In some embodiments, the outer periphery of the optical fiber and the fiber grating sensor is covered with a flexible protective sheath.

[0015] In combination with the first aspect, in a possible implementation, the waterstop structure assembly for the tunnel lining segment joints also includes a buffer connection block, which is arranged on the inner side of the inner layer, and the front and rear sides of the buffer connection block are respectively connected to the tunnel body, and the buffer connection block can absorb the destructive energy generated by the fault movement.

[0016] In some embodiments, the buffer connection block includes rigid plates and rubber plates alternately distributed along the long axis direction of the tunnel body.

[0017] In some embodiments, the buffer connection block also includes a bolt, a first through hole is opened on the rigid plate, a second through hole corresponding to the first through hole is opened on the rubber plate, the bolt passes through the first through hole and the second through hole, and both ends of the bolt are respectively fixedly connected to the tunnel body on the corresponding side.

[0018] Compared with the prior art, the scheme shown in the embodiment of the present application adopts a double-layer structural design for the waterstop main body. The outer layer is a grid structure with multiple intersecting force transmission paths within its laying surface, and has good force strength. In the absence of serious fault dislocation, the deformation energy of the area can be absorbed by the outer layer, and a certain degree of buffering is obtained. The outer layer is not easily damaged, and the inner layer maintains a sealing covering effect on the designated area. If serious fault dislocation occurs, the grid structure can also produce a relatively regular tearing path according to its own mesh distribution. Subsequently, the wrinkled inner layer can also be unfolded in a direction parallel to the long axis of the tunnel main body. When the maximum unfolding length of the inner layer is set reasonably, the inner layer will not be damaged or cracked due to fault dislocation, and the sealing covering effect of the inner layer on the area is still effective, and the problem of overall damage and leakage of the waterstop is not likely to occur. In addition, by setting up a sensor device, the strain of the inner layer can be monitored, and then its stress deformation (mainly tensile deformation along the extension direction of the tunnel body) can be analyzed. Once the deformation exceeds the preset value, it is judged that the inner layer is at risk of tearing. At the same time, the sensor device also has a leakage monitoring function, which can directly monitor whether there is liquid flowing into the inner side of the inner layer, and then provide a direct leakage alarm.

[0019] In general, in the waterstop structure assembly used for tunnel lining segment joints of the present application, the waterstop body is not easy to be damaged, has a long service life, and has a relatively low cost of use; at the same time, by monitoring the strain and leakage of the waterstop body, a more accurate judgment can be made on whether the inner layer is torn and leaking, so as to facilitate maintenance before a serious accident occurs, thereby improving safety of use.

[0020] In a second aspect, the present application also provides a construction method for a waterstop structure assembly for a tunnel lining segment joint, comprising the following steps: S100. In combination with the tunnel excavation sequence, after the tunnel excavation is completed, a certain thickness of concrete is sprayed on the tunnel surface according to the construction requirements to form the primary support, thereby controlling the deformation of the surrounding rock; S200, spray a certain thickness of rubber concrete on the inner surface of the primary support as a shock-absorbing layer, then lay a layer of geotextile, and then lay a layer of waterstop body; S300. A sensing device is provided on the inner side surface of the inner layer in the waterstop body to monitor the strain and leakage of the waterstop body.

[0021] Compared with the prior art, the solution shown in the embodiment of the present application has a simple overall construction process, the waterstop body is not easily damaged, the waterstop body has a long service life, and a relatively accurate judgment can be made on whether the inner layer is torn and leaking, so as to facilitate maintenance before a serious accident occurs, thereby improving safety in later use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of an axial section of a waterstop structure assembly for a tunnel lining segment joint provided by an embodiment of the present invention; Figure 2 A schematic diagram of the partial structure of the waterstop body used in an embodiment of the present invention; Figure 3 A schematic diagram of a sensor device used in an embodiment of the present invention; Description of reference numerals: 1. Waterstop body; 110, inner layer; 120, outer layer; 2. Sensing device; 210, fiber optic Bragg grating sensor; 3. Tunnel body; 310, first construction section; 320, later construction section; 4. Protective cover; 5. Buffer connection block; 510, rigid plate; 520, rubber plate; 530, bolts; 540, connection plate; 6. Concrete pouring layer. DETAILED DESCRIPTION

[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] In the claims, description and the above-mentioned drawings of the present invention, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" etc. are for distinguishing different objects rather than for describing a specific order.

[0025] In the claims, specification and the above-mentioned drawings of the present invention, unless otherwise explicitly defined, directional words, such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise", "high", "low", etc., indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the specific protection scope of the present invention.

[0026] In the claims, specification and the above drawings of the present invention, unless otherwise clearly defined, if the term "fixed connection" or "fixed connection" is used, it should be understood in a broad sense, that is, any connection method without a displacement relationship and relative rotation relationship between the two, that is to say, including non-detachable fixed connection, detachable fixed connection, integrated connection and fixed connection through other devices or elements.

[0027] In the claims, description and drawings of the present invention, if the terms "include", "have" and their variations are used, they are intended to mean "including but not limited to".

[0028] Please also read Figure 1 and Figure 2 The water stop structure assembly for tunnel lining segment joints provided by the present invention is now described. The water stop structure assembly for tunnel lining segment joints is arranged at the deformation joints, post-casting strips, construction joints, connection ports, etc. of the tunnel, that is, a gap of a certain width reserved between two construction sections in the tunnel body 3. Since the two construction sections are constructed and formed separately, the gap area is the weak link of the waterproof structure. In order to achieve waterproof sealing of the area, the waterstop strip structure assembly for the tunnel lining segment joint includes a waterstop strip body 1 and a sensor device 2; the waterstop strip body 1 has a corrugated inner layer 110 and a grid-shaped outer layer 120, the corrugation extension direction of the inner layer 110 is parallel to the long axis direction of the tunnel body 3, the outer layer 120 covers the outer side of the inner layer 110 and is connected to the crest of the inner layer 110, and the front and rear edges of the inner layer 110 and the front and rear edges of the outer layer 120 are respectively connected to the tunnel body 3; the sensor device 2 is arranged on the inner side of the inner layer 110, and is used to sense the strain and leakage of the inner layer 110.

[0029] In this embodiment, the tunnel body 3 is divided into a first construction section 310 and a second construction section 320. The construction of the first construction section 310 is earlier than that of the second construction section 320. A concrete casting layer 6 is provided between the first construction section 310 and the second construction section 320, and the waterstop body 1 is provided outside the concrete casting layer 6. The term "front" refers to the direction of the waterstop body 1 toward the second construction section 320, and the term "back" refers to the direction of the waterstop body 1 toward the first construction section 310.

[0030] In this embodiment, the specific implementation of the inner layer 110 includes but is not limited to: a wavy configuration extending along the long axis direction of the tunnel body 3. Based on this, the crests and troughs of the wavy inner layer 110 are rounded to avoid stress concentration in the crest and trough areas, which may cause tearing in the areas, thereby improving the reliability of the inner layer 110 and extending its service life.

[0031] In this embodiment, in the grid structure of the outer layer 120 , the meshes may be rectangular meshes, square meshes, circular meshes, etc., and the meshes are regularly arranged in a rectangular array.

[0032] Compared with the prior art, the waterstop structure assembly for tunnel lining segment joints provided in the present embodiment adopts a double-layer structural design in which the waterstop body 1 has an outer layer 120 of a grid structure having multiple mutually intersecting force transmission paths within its paving surface and having good force-bearing strength. In the absence of serious fault dislocation, the deformation energy of the area can be absorbed by the outer layer 120, and a certain degree of buffering is obtained. The outer layer 120 is not easily damaged, and the inner layer 110 maintains a sealing covering effect on the designated area. If a serious fault dislocation occurs, the grid structure can also produce a relatively regular tearing path according to its own mesh distribution. Subsequently, the wrinkled inner layer 110 can also be unfolded in a direction parallel to the long axis of the tunnel body 3. When the maximum unfolding length of the inner layer 110 is reasonably set, the inner layer 110 will not be damaged or cracked due to the fault dislocation, and the sealing covering effect of the inner layer 110 on the area is still effective, and the problem of overall damage and leakage of the waterstop is not likely to occur. In addition, by setting up the sensor device 2, the strain of the inner layer 110 can be monitored, and then its stress deformation (mainly tensile deformation along the extension direction of the tunnel body 3) can be analyzed. Once the deformation exceeds the preset value, it is judged that the inner layer 110 is at risk of tearing; at the same time, the sensor device 2 also has a leakage monitoring function, which can directly monitor whether there is liquid flowing into the inner side of the inner layer 110, and then provide a direct leakage alarm.

[0033] In general, in the waterstop structure assembly for tunnel lining segment joints of the present embodiment, the waterstop body 1 is not easily damaged, has a long service life, and has a relatively low cost of use; at the same time, by monitoring the strain and leakage of the waterstop body 1, a more accurate judgment can be made as to whether the inner layer 110 is torn and leaking, so as to facilitate maintenance before a serious accident occurs, thereby improving safety of use.

[0034] In some embodiments, the outer layer 120 is a steel mesh component, which can provide sufficient support under normal conditions to maintain the stability of the structure in the area where the waterstop body 1 is located, and can also break after being subjected to a large external force. Compared with the flexible mesh material, the fracture path of the outer layer 120 of this embodiment is more regular. At the same time, the inner layer 110 is a rubber component with excellent waterproof performance. In addition to meeting the sealing requirements for the area covered by the waterstop body 1, it can also be more smoothly unfolded after breaking, and has higher reliability in use.

[0035] This embodiment optimizes the shape and material of the waterstop body 1 to improve its waterproof and water-blocking properties, improve the durability and tensile strength of the waterstop body 1, and extend its service life. At the same time, the cross-sectional shape of the waterstop body 1 is optimized to make it more stable and airtight when under pressure, reducing the possibility of leakage. In practical applications, by closely combining with the lining of the first construction section 310 and the lining of the subsequent construction section 320, a continuous waterproof barrier is formed. Its efficient waterproof capability can not only protect the tunnel structure, but also ensure the driving safety and stable operation of equipment in the tunnel.

[0036] During construction, the appearance and installation of the waterstop are also strictly required. If the waterstop is improperly selected or installed, it is easy to cause poor waterproofing effect, loose fit, breakage and other serious problems. To avoid this problem, refer to Figure 1 In some embodiments, the front and rear edges of the outer layer 120 are respectively connected to the outer peripheral surface of the first construction section 310 and the outer peripheral surface of the rear construction section 320 by threaded fasteners, and the front and rear edges of the inner layer 110 are respectively connected to the outer peripheral surface of the first construction section 310 and the outer peripheral surface of the rear construction section 320 by threaded fasteners to ensure sealing.

[0037] In some specific embodiments where the inner layer 110 is connected to the outer layer 120, the outer layer 120 is implemented in the following ways, but not limited to: 1) the outer layer 120 includes a plurality of longitudinal steel bars and a plurality of transverse steel bars, which are crossed and fixed by welding; 2) the outer layer 120 includes a plurality of longitudinal steel bars and a plurality of transverse steel bars, which are crossed and fixed by binding. The thickness of the transverse steel bars and the thickness of the longitudinal steel bars are set according to the specific conditions of the tunnel, generally 2mm~3mm, and the spacing between two adjacent transverse steel bars and the spacing between two adjacent longitudinal steel bars are generally 5mm~10mm.

[0038] In specific implementation, the inner layer 110 is made of high-strength rubber, and the thickness is set according to specific construction requirements, generally 4 mm to 6 mm (for example, 5 mm).

[0039] On the basis of the above-mentioned embodiment, the inner layer 110 and the outer layer 120 are bonded together to avoid the generation of connection holes on the inner layer 110 that would affect the integrity and sealing of the inner layer 110 .

[0040] In a specific implementation, the inner layer 110 and the outer layer 120 are firmly connected together with a high-strength adhesive to ensure that they will not separate during use (even if the outer layer 120 is torn, it can maintain a basic connection with the inner layer 110, and the inner layer 110 and the outer layer 120 will not separate from each other). The implementation methods of the high-strength adhesive include but are not limited to epoxy resin adhesive, silicone adhesive, polyamide adhesive, permanent adhesive, anaerobic adhesive, etc.

[0041] In some embodiments, see Figure 3 The sensing device 2 includes an optical fiber and a fiber grating sensor 210. The optical fiber is laid along the length direction of the inner layer 110, and the fiber grating sensor 210 is arranged on the optical fiber. The present embodiment adopts the fiber grating sensor 210 for sensing. The fiber grating uses wavelength encoding for the sensed information, and the wavelength is an absolute parameter, which is not affected by the system loss caused by factors such as the power fluctuation of the light source and the bending of the optical fiber. Therefore, the fiber grating sensor 210 has very good reliability and stability, can work in harsh environments, has high sensitivity and high resolution when measuring various physical quantities such as temperature, pressure, strain, stress, flow, etc., and is suitable for tunnel monitoring needs of long-distance remote control monitoring; in addition, the fiber grating sensor 210 has a simple structure and a small size, which is suitable for embedded installation or installation in a small space, which is also suitable for installation in the small space inside the inner layer 110. Moreover, the fiber grating sensor 210 has strong reusability. A plurality of fiber grating sensors 210 can form a distributed fiber optic sensing network, which is suitable for large-scale monitoring and greatly improves the simplicity and reliability of the tunnel monitoring network. In the leakage monitoring process, the characteristics of the fiber grating are used to monitor in real time whether a pipeline or container is leaking. Once water seeps in, the water will contact the fiber grating sensor 210. At this time, the optical signal transmitted by the fiber grating sensor 210 will change due to the intervention of water. By monitoring these changing optical signals, it is possible to accurately determine whether a leakage occurs, and to accurately locate the specific location and severity of the leakage, thereby minimizing the risk of accidents.

[0042] The working principle of the fiber grating sensor 210 of this embodiment is roughly as follows: S10, the external acquisition device performs position numbering on each fiber grating sensor 210 on the optical fiber; S20, if the external temperature changes, the temperature of the optical fiber changes, and at this time, the shift direction of the reflected light wavelength is determined; if the reflected light wavelength shifts toward the short-wave direction, it is determined that the ambient temperature has increased; if the reflected light wavelength shifts toward the long-wave direction, it is determined that the ambient temperature has decreased; S30. By comparing with the early warning module, it is determined whether the ambient temperature has changed dramatically, and leakage and strain conditions are analyzed according to the change of ambient temperature.

[0043] Wherein, step S30 specifically includes: The total Bragg wavelength change is:

[0044] in, is the change in the Bragg wavelength, is the effective photoelastic constant of the optical fiber, It's strain. is the coefficient of thermal expansion, is the temperature photoelastic constant, is the temperature change. By measuring the wavelength change at the same time and knowing the characteristic constants of the optical fiber material ( , , ), we can solve for strain  and temperature change . Corresponding strain and temperature changes By analyzing, it is possible to monitor water leakage and strain, thus realizing the self-sensing function.

[0045] On the basis of the above-mentioned embodiment, a plurality of fiber grating sensors 210 are provided, and the plurality of fiber grating sensors 210 are evenly distributed along the extension direction of the optical fiber, so that each part of the entire water stop belt body 1 can be effectively monitored for strain and leakage. In specific implementation, an optical fiber is embedded in a key position of the inner layer 110 (such as a bend, a joint, etc. of the inner layer 110), and a plurality of fiber grating sensors 210 are evenly distributed on the optical fiber, and each fiber grating sensor 210 corresponds to a different monitoring point.

[0046] In some embodiments, see Figure 3 The optical fiber and the fiber grating sensor 210 are fixed to the inner side of the inner layer 110 of the water stop belt body 1, and the outer periphery of the optical fiber and the fiber grating sensor 210 is covered with a flexible protective sleeve 4 to prevent the optical fiber and the fiber grating sensor 210 from being damaged during installation and use. Optionally, the specific implementation of the protective sleeve 4 includes but is not limited to a polyurethane protective sleeve, which is bonded to the inner layer 110 of the water stop belt body 1 by an adhesive, and the connection reliability is high and the connection is more convenient.

[0047] In some embodiments, see Figure 1 The water stop structure assembly for the tunnel lining segment joint also includes a buffer connection block 5, which is arranged on the inner side of the inner layer 110. The front and rear sides of the buffer connection block 5 are respectively connected to the tunnel body 3 (that is, the rear side is connected to the first construction section 310, and the front side is connected to the rear construction section 320). The buffer connection block 5 can absorb the destructive energy generated by the fault dislocation, and can correspondingly generate compression and stretching along the long axis direction of the tunnel body 3 when the fault dislocation occurs, or a slight torsion (the angle does not exceed 10°) on a plane perpendicular to the long axis direction of the tunnel body 3, further reducing the internal stress of the secondary lining and the damage range of the lining.

[0048] In some specific embodiments of the buffer connection block 5, the buffer connection block 5 includes a rigid plate 510 and a rubber plate 520 alternately distributed along the long axis direction of the tunnel body 3, such as Figure 1As shown. In this embodiment, the alternating stacking combination of rigid plates 510 and rubber plates 520 makes the buffer connection block 5 have a higher structural strength as a whole, meeting the connection support requirements between the first construction section 310 and the rear construction section 320; at the same time, by setting up multiple layers of rubber plates 520, multiple deformable areas are formed between the first construction section 310 and the rear construction section 320, so that the deformation of the buffer connection block 5 is more flexible, which can better adapt to the buffering requirements when the fault dislocation occurs. In specific implementation, the implementation methods of the rigid plate 510 include but are not limited to stainless steel plates, and the implementation methods of the rubber plate 520 include but are not limited to rubber plates. In addition, in order to improve the integrity of the structure, the adjacent rigid plates 510 and rubber plates 520 are tightly fitted (they can only be in abutment contact or can be connected by bonding).

[0049] Based on the above embodiments, see Figure 1 In order to maintain the integrity of the structure formed by the combination of the rigid plate 510 and the rubber plate 520, the buffer connection block 5 also includes a bolt 530. The rigid plate 510 is provided with a first through hole, and the rubber plate 520 is provided with a second through hole corresponding to the first through hole. The bolt 530 passes through the first through hole and the second through hole, and the two ends of the bolt 530 are respectively fixedly connected to the tunnel body 3 on the corresponding side. Among them, the front end of the bolt 530 is embedded and fixed in the lining of the rear construction section 320, and the rear end of the bolt 530 is embedded and fixed in the lining of the first construction section 310. Optionally, the two ends of the bolt 530 are provided with threads, so that the front end and the rear end of the bolt 530 are respectively screwed and fixed to the rear construction section 320 and the first construction section 310, and the fixing effect is more reliable.

[0050] More specifically, the end of the buffer connection block 5 can be a rigid plate 510 or a rubber plate 520. The embodiment exemplarily shows an embodiment in which the rear end of the buffer connection block 5 is a rigid plate 510 and the front end is a rubber plate 520. In other examples not shown in the figures, both the rear end and the front end of the buffer connection block 5 are rubber plates 520. In some more specific embodiments, see Figure 1 , a rigid connecting plate 540 is attached to the cross section of the tunnel body 3 (i.e., the front end face of the first construction section 310 and the rear end face of the rear construction section 320 are attached to the connecting plate 540 respectively), a third through hole is opened on the connecting plate 540, and the bolt 530 passes through the third through hole and is connected to the lining of the tunnel body 3. In this embodiment, the cross section of the tunnel body 3 is strengthened by the connecting plate 540 to avoid the problem that the bolt 530 connection generates a pulling force on the tunnel body 3, which eventually causes damage to the cross section of the tunnel body 3. Optionally, the implementation of the connecting plate 540 includes but is not limited to a stainless steel plate.

[0051] Compared with traditional tunnel waterstops, the waterstop structure assembly for tunnel lining segment joints of the present application has the following advantages: The water stop structure assembly for the tunnel lining segment joint of the present application integrates a fiber grating sensor 210, which can monitor strain and temperature changes in real time and promptly discover potential problems at the tunnel lining segment joint. The fiber grating sensor 210 has high sensitivity and can accurately sense tiny strain and temperature changes to ensure the accuracy of the monitoring data, and can quickly respond to environmental changes, provide timely warning information, and help take preventive measures in advance.

[0052] The use of high-quality waterproof materials and corrosion-resistant design ensures that the waterstop body 1 can effectively prevent water seepage in a complex geological environment for a long time. The waterstop body 1 adopts a modular design, which is convenient for rapid installation and replacement on site, reducing construction difficulty and time cost.

[0053] The main body 1 of the waterstop is a double-layer structure, the outer layer 120 is a grid structure, and the inner layer 110 is a pleated structure, which plays a water-stopping role. After the mesh structure on the surface is pulled and broken by the lateral force, the inner layer 110 can achieve adaptive deformation to make it fit the tunnel better.

[0054] By embedding the optical fiber and the fiber grating sensor 210 into the water stop belt body 1 during construction, the fiber grating sensor 210 added to the embedded optical fiber decouples the influence of strain and temperature through a mathematical model. By analyzing the strain and temperature changes, the leakage water and strain can be monitored, thereby realizing the self-sensing function.

[0055] Real-time monitoring and early warning functions reduce the need for frequent maintenance and repairs caused by water seepage and structural damage. Effective waterproofing and protection design extend the service life of the tunnel lining and waterstop body 1, reducing replacement and repair costs.

[0056] Based on the same inventive concept, the present application also provides a construction method for a waterstop structure assembly for a tunnel lining segment joint, comprising the following steps: S100. In combination with the tunnel excavation sequence, after the tunnel excavation is completed, a certain thickness of concrete is sprayed on the tunnel surface according to the construction requirements to form the primary support, thereby controlling the deformation of the surrounding rock; S200, spraying a certain thickness of rubber concrete on the inner surface of the primary support as a shock-absorbing layer, and then laying a layer of geotextile, and then laying a layer of waterstop body 1; S300 , a sensor device 2 is provided on the inner side surface of the inner layer 110 in the waterstop strip body 1 to monitor the strain and leakage of the waterstop strip body 1 .

[0057] Optional, the thickness of the primary support concrete is generally 20cm~35cm, depending on the specific tunnel design requirements. The thickness of the rubber concrete is usually 15mm~50mm to provide adequate shock absorption and waterproof performance, depending on the specific tunnel design requirements. The thickness of the geotextile is generally 2mm~5mm, used to enhance the overall waterproof structure.

[0058] Compared with the prior art, the construction method of the waterstop structure assembly for tunnel lining segment joints provided in this embodiment has a simple overall construction process, the waterstop body 1 is not easily damaged, the waterstop body 1 has a long service life, and can make a more accurate judgment on whether the inner layer 110 is torn and leaking, so as to facilitate maintenance before a serious accident occurs, thereby improving the safety of later use.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A waterstop structure assembly for tunnel lining segment joints, characterized in that: include: A water stop strip body (1) comprises a corrugated inner layer (110) and a grid-shaped outer layer (120), wherein the corrugations of the inner layer (110) extend in a direction parallel to the long axis direction of the tunnel body (3), the outer layer (120) covers the outer side of the inner layer (110) and is connected to the crest of the inner layer (110), and the front and rear edges of the inner layer (110) and the front and rear edges of the outer layer (120) are respectively connected to the tunnel body (3); The sensing device (2) is arranged on the inner side of the inner layer (110) and is used to sense the strain and leakage of the inner layer (110).

2. The waterstop structure assembly for tunnel lining segment joints according to claim 1, characterized in that: The outer layer (120) is a steel mesh component, and the inner layer (110) is a rubber component.

3. The water stop strip structure assembly for tunnel lining segment joints according to claim 2, characterized in that: The inner layer (110) and the outer layer (120) are bonded together.

4. The waterstop structure assembly for tunnel lining segment joints according to claim 1, characterized in that: The sensing device (2) comprises an optical fiber and a fiber grating sensor (210); the optical fiber is laid along the length direction of the inner layer (110); and the fiber grating sensor (210) is arranged on the optical fiber.

5. The water stop strip structure assembly for tunnel lining segment joints according to claim 4, characterized in that: A plurality of the fiber grating sensors (210) are provided, and the plurality of the fiber grating sensors (210) are evenly distributed along the extension direction of the optical fiber.

6. The water stop strip structure assembly for tunnel lining segment joints according to claim 4, characterized in that: The outer peripheries of the optical fiber and the optical fiber grating sensor (210) are covered with a flexible protective sheath (4).

7. The waterstop structure assembly for tunnel lining segment joints according to claim 1, characterized in that: The water stop strip structure assembly for tunnel lining segment joints further comprises a buffer connection block (5), wherein the buffer connection block (5) is arranged on the inner side of the inner layer (110), and the front and rear sides of the buffer connection block (5) are respectively connected to the tunnel body (3), and the buffer connection block (5) can absorb the destructive energy generated by fault dislocation.

8. The water stop strip structure assembly for tunnel lining segment joints according to claim 7, characterized in that: The buffer connection block (5) comprises rigid plates (510) and rubber plates (520) which are alternately distributed along the long axis direction of the tunnel body (3).

9. The water stop strip structure assembly for tunnel lining segment joints according to claim 8, characterized in that: The buffer connection block (5) further comprises a bolt (530), the rigid plate (510) is provided with a first through hole, the rubber plate (520) is provided with a second through hole corresponding to the first through hole, the bolt (530) passes through the first through hole and the second through hole, and both ends of the bolt (530) are respectively fixedly connected to the tunnel body (3) on the corresponding side.

10. A construction method for a water stop structure assembly for a tunnel lining segment joint, characterized in that: The steps include: S100. In combination with the tunnel excavation sequence, after the tunnel excavation is completed, a certain thickness of concrete is sprayed on the tunnel surface according to the construction requirements to form the primary support, thereby controlling the deformation of the surrounding rock; S200, spraying a certain thickness of rubber concrete on the inner surface of the primary support as a shock-absorbing layer, and then laying a layer of geotextile, and then laying a layer of waterstop body (1); S300. A sensing device (2) is provided on the inner side surface of the inner layer (110) in the waterstop body (1) to monitor the strain and leakage of the waterstop body (1).

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