Tunnel waterproof plate welding seam air tightness detection equipment

Abstract

The invention belongs to the technical field of air tightness detection, and discloses tunnel waterproof plate weld air tightness detection equipment, which is used for non-destructively detecting the air tightness of double welds at the lap joint of a tunnel waterproof plate, and comprises a signal cable and a plurality of air pressure sensors connected through the signal cable along the length direction of the signal cable, the two ends of the cable are connected with air tightness detection equipment, and the cable is arranged in the space between the double welding rods before the double welding rods of the adjacent waterproof plates which are overlapped in a lap joint mode are welded. The signal cable with the multiple air pressure sensors is buried in the space between the double welding seams before welding or during welding, the electric signals are sent through the air pressure detection equipment connected externally, and the air pressure change in the long and narrow channel is detected in a multi-point mode in cooperation with the end inflation mode; therefore, the problem of destructive insertion detection of the existing contact pin can be solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of tunnel detection, and particularly relates to a tunnel waterproof board weld airtightness detection device. Background Art

[0002] In the construction operation of tunnel waterproof boards, for the arched area in the tunnel except the ground, a geotextile needs to be covered on the surface of the formed concrete layer structure, and a number of hot-melt gaskets arranged in a matrix are provided on the surface of the geotextile. The geotextile is fixed on the concrete layer surface through the hot-melt gaskets inserted into the concrete layer structure surface. Then a waterproof board is covered on the surface of the formed geotextile layer, and the inner hot-melt gaskets are melted on the surface of the waterproof board by external ultrasonic waves or other equipment to be fixedly connected with the waterproof board. The geotextile layer and the waterproof board layer are fixed simultaneously through the hot-melt gaskets, and the non-destructive installation of the waterproof board layer is achieved.

[0003] In the prior art, the waterproof board layer is generally laid with a polymer coil with a thickness of 1 - 3 mm. The current waterproof board coil generally has a width of about 4 m. With the assistance of tunnel lining equipment for construction, a waterproof board coil with a larger width can be used for laying, and the width can be extended to about 7 m. When arranging the waterproof board, the coil is unfolded and arranged along the top arch from one side of the ground to the other side, and adjacent waterproof boards are connected and covered by overlapping. In order to form an integral waterproof layer material in the tunnel, two welding rods are provided in the overlapping area of adjacent two waterproof boards. The welding is carried out from one side of the waterproof board through a welding machine, and finally a double-weld structure is formed between adjacent two waterproof boards to ensure its waterproof connection effect.

[0004] For this double-weld structure, an airtightness test needs to be carried out after construction. Most of the existing test methods use an airtightness test device with a needle to penetrate into the space inside the double-weld structure from the outside for air pressure detection. Then one opening on one side of the double-weld space is blocked, and gas with a pressure of 0.25 MPa is injected from the other opening, and the air pressure drop value within ten minutes is detected. When the air pressure drops to no more than 10%, it is determined to be qualified. If it is greater than 10%, the air leakage point needs to be found by spraying soapy water on the surface to look for bubbles, and the air leakage point is repaired by welding.

[0005] However, this method often encounters some problems during operation, resulting in subsequent water seepage in the waterproof board, and at the same time reducing the construction and detection efficiency.

[0006] First, the existing waterproof board itself is about 2mm thick, and the overlap area is 150mm wide, while the double weld space is generally about 20mm wide and only 4mm thick. Polymer materials of this size are soft when laid over a large area, and wrinkles may form at the joints. Workers can easily puncture the two layers of waterproof board due to improper operation when inserting needles. This method requires repair welding after the test, which is difficult to operate. Second, in existing large tunnels, this double-weld channel with a width of only 20mm is 30m long. In such a narrow and long channel, inserting a needle to inflate the air often results in the channel being partially narrowed and closed due to wrinkles or extrusion deformation of the waterproof sheet in actual operation. If you want to determine the air tightness of the entire weld, it is not effective to determine it at only one test point. You need to insert needles at least at multiple points on the top arch to check the changes in the air pressure value. In actual operation, the top air pressure value may be significantly low, and it is impossible to determine whether there is a leak or the inflation process is blocked, resulting in repeated testing or even rework. Third, once a leak is detected in such a long and narrow channel, it is impossible to accurately determine the leak point by simply inserting a needle to test the air pressure at sparse points. Only manual inspection of the leak point by continuously spraying soapy water along the weld from the outside is very inefficient. Fourth, when there is a leak, soapy water is sprayed on the outside to check for bubbles and determine the leak point. However, at the joint of the double weld, it is not certain which side of the weld has the leak. If it is on the outside of the gap close to the overlap, it can be determined by spraying soapy water on the surface, but if it is on the inside, soapy water on the surface cannot enter, and a needle cannot be used to inject it. Currently, during construction, the only way to check the internal leak point is to flip up the waterproof board on one side that is not overlapped with other waterproof boards from the outside and spray water from the back. However, its width is generally more than 4m and it is difficult to flip up the middle part, which affects the detection efficiency.

[0007] In the prior art, in order to avoid the first problem, multiple needles are reserved before welding. However, this method will also damage the waterproof board itself, and it is necessary to inject glue into the gap for sealing. At the same time, the reserved needles still need to be sealed after the inspection is completed. The efficiency is not high and it cannot solve the subsequent three problems. Summary of the invention

[0008] In order to solve the problems existing in the prior art, the present invention provides a tunnel waterproofing board weld air tightness detection device, which mainly uses cables with several air pressure sensors arranged along the narrow and long space in the middle of the double welds to perform end inflation detection, which can solve the problem of damaging the waterproofing board by inserting pins, and realize efficient inflation detection in a non-destructive way, and does not require manual reaching the top of the arch for pin insertion detection, while meeting the existing standard requirements for inflation detection.

[0009] The technical solution adopted by the present invention is: In the first aspect, the present invention provides a tunnel waterproofing board weld air tightness detection device, which is used for non-destructive detection of the air tightness of double welds at the overlap of the tunnel waterproofing board, including a signal cable and a plurality of air pressure sensors along the length direction of the signal cable and connected by the signal cable, and the air tightness detection device is connected to both ends of the cable. The cable is placed in the space between the double welding rods before the double welding rods of adjacent overlapping waterproofing boards are welded.

[0010] In combination with the first aspect, the present invention provides a first implementation manner of the first aspect, wherein one end of the signal cable has a connection end connected to a creeping welding machine and enters into the space between the double welding rods with the creeping welding machine.

[0011] In combination with the first aspect, the present invention provides a second implementation of the first aspect, wherein the signal cable is arranged in the space between the double welding rods following the waterproof board when the waterproof board roll is deployed.

[0012] In combination with the first aspect, the present invention provides a third implementation of the first aspect, wherein the signal cables include two, each signal cable is arranged in the space between the double welding rods in a folded manner, and both ends of each signal cable pass through the same side opening of the space between the double welding rods; The folded parts of the two signal cables are arranged facing each other and close to each other in the space between the double welding rods; The air pressure sensors provided on each signal cable are staggered when the signal cable is folded in half, and the spacing distance between adjacent air pressure sensors of the signal cable in the folded state is half of the spacing distance between adjacent air pressure sensors on a single signal cable.

[0013] It is worth noting that the so-called folding refers to folding a single signal cable at the midpoint of its length to form two parallel signal cables, with the two ends arranged in the same direction and the length halved. This method is suitable for tunnel arched passages with a longer layout length. When arranging, the space between the entire double welding rods is also divided into two parts along the midpoint of the length. Each part is provided with a folded signal cable, which is passed out from a port corresponding to the two parts. Compared with the method of a single signal cable passing completely through the space between the double welding rods, this arrangement can reduce the layout length of the signal cable and enhance the risk resistance performance.

[0014] It is also worth mentioning that a spacing distance L is set for adjacent air pressure sensors on a single signal cable. Compared with the solution of fully arranging a single line, the spacing distance L is doubled. Then, the single signal cable is folded in half and arranged in a staggered manner, that is, the folding point is on both sides of the midpoint of the signal cable, so that the spacing distance between two adjacent air pressure sensors along the length direction of the cable on the folded and parallel cable is L / 2.

[0015] In combination with the first aspect, the present invention provides a fourth implementation manner of the first aspect, wherein the signal cable comprises at least two sub-cables, each sub-cable being connected via a detachable connector, the detachable connector comprising two bayonet ports having first contacts, the sub-cable comprising a bayonet port detachably engaged with the port, the bayonet having a second contact in contact with and conductively connected to the first contact in the bayonet; The surface of the detachable connector is provided with a button for pressing and triggering, and the button is drivingly connected with a buckle arranged in the bayonet for clamping the limit clamp.

[0016] In combination with the first aspect, the present invention provides a fifth implementation of the first aspect, wherein a pull rope is provided along the length direction of the signal cable, the pull rope is placed in the space between the double welding rods together with the signal cable, and at least one end of the pull rope is outside the opening of the space between the double welding rods; The air pressure sensor is fixed on the pull rope, and the length of the pull rope between adjacent air pressure sensors fixed on the pull rope is shorter than the length of the signal cable.

[0017] The so-called pull rope refers to a linear structure arranged along the length of the signal cable, which is mainly used for fixing and bearing. In order to improve the reuse rate of the equipment and reduce the cost of use, a pull rope with axial tensile resistance is used to fix the signal cable, and the end is left outside for easy pulling. After the air tightness test is completed, the pull rope can be pulled outside the space opening between the double welding rods to pull the entire signal cable out of the opening at the bottom of the ground and place it in the space between the double welding rods, so that the air tightness test can be performed on the weld of another set of waterproof panels next time.

[0018] It should also be noted that the signal cable is only used to connect each air pressure sensor, and the pull rope is used to provide pulling force. The pull rope itself is made of tensile-resistant material with low elongation performance, such as nylon rope or other polymer woven materials. The length of the pull rope set between adjacent air pressure sensors is shorter than the length of the signal cable. In this way, when the pull rope is subjected to axial tensile force, only the pull rope is under stress, and the signal cable is not under stress, thereby avoiding damage.

[0019] In combination with the fifth embodiment of the first aspect, the present invention provides a sixth embodiment of the first aspect, wherein the pull rope is a tubular structure with one end of the inserted part closed, and the other end of the pull rope passes through the space opening between the double welding rods and is connected to an external air compressor; Several air nozzles are arranged at intervals on the pull rope, and 0.25MPa gas is introduced into the pull rope by an external air compressor to test the air tightness of the space between the double welding rods.

[0020] In combination with the sixth embodiment of the first aspect, the present invention provides a seventh embodiment of the first aspect, wherein the air pressure sensor is fixed on the surface of the pull rope and is staggered with the air nozzle, and the signal cable connecting adjacent air pressure sensors is arranged inside the pull rope or inside the inner wall.

[0021] In combination with the fifth embodiment of the first aspect, the present invention provides an eighth embodiment of the first aspect, wherein the pull rope is provided with at least two inserted independent pipes with one end closed along the length direction, and the pipes include an air pipe connected to an air compressor and a water pipe connected to a water pump that pass through the space opening between the double welding rods; The air pipe is provided with a plurality of air nozzles at intervals, and the water pipe is provided with a plurality of nozzles at intervals, and the nozzles and the air nozzles are staggered along the length direction of the pull rope; The air tightness test of the space between the two electrodes is conducted by introducing 0.25MPa gas into the pull rope from an external air compressor. When there is a leak or the pull cord needs to be pulled out, soapy water is injected into the water pipe by an external water pump and sprayed out from the nozzle.

[0022] In combination with the eighth embodiment of the first aspect, the present invention provides a ninth embodiment of the first aspect, wherein a wire pipe for arranging a signal cable is provided between the air pipe and the water pipe of the pull rope, the air pressure sensor is arranged outside the wire pipe, and the signal cable passes through the wire pipe and is connected to the air pressure sensor.

[0023] The beneficial effects of the present invention are: (1) The present invention buries a signal cable with several air pressure sensors in the space between the double welds before or during welding, and sends an electrical signal through an externally connected air pressure detection device, and detects the air pressure changes in the narrow and long channel at multiple points in combination with the end inflation method, thereby solving the problem of the existing pin-destructive insertion detection. Under the premise of reducing the risk of water seepage in the waterproof board, the air pressure value changes at several points can be obtained in a non-destructive manner. Even if there is a situation in which the air pressure in the channel does not correspond due to forced narrowing and blockage caused by external deformation, the corresponding position can be determined by arranging pressure detection at multiple points and the channel can be manually adjusted to improve the situation. It can also eliminate some error values ​​caused by pressure gradient changes during large-span detection, thereby improving the detection accuracy. (2) The present invention utilizes a special welding method of a climbing welding machine to connect the signal cable to the climbing welding machine so that the climbing welding machine directly places the signal cable into the space between the formed double welds, thereby avoiding the need to set up a separate signal cable and improving wiring efficiency; (3) The present invention pre-places the signal cable between two welding rods by using equipment that follows the laying of waterproof sheet coils, thereby achieving a pre-installation effect before the welding machine, which can also improve efficiency and save time for separate wiring; (4) By folding the signal cable, the present invention divides the relatively long channel into at least two parts, and utilizes the openings at both ends and the staggeredly arranged air pressure sensors, so that the single signal cable that originally needed to be completely arranged along the length of the channel is divided into two parts with the highest point of the median line of the crown arch, providing the possibility of pulling out two signal cables from the unilateral opening. At the same time, the folding and staggering arrangement can also achieve the uniform arrangement of the pressure sensors; (5) The present invention further improves the feasibility of pulling out the signal cable and the air pressure sensor from the two side ports through the provided pull rope. At the same time, the pull rope bears the force itself, and the signal cable and the air pressure sensor are not stressed during the pulling process, protecting the signal cable and the air pressure sensor as much as possible. At the same time, through the built-in air pipe and water pipe, it can ensure that after the space for forming the double weld is formed, the smoothness of the gas flow is guaranteed, improving the detection efficiency. At the same time, by spraying water from the inside to both sides, it can not only effectively check the feasibility of air leakage points on both sides, but also inject soapy water into the middle space of the double weld to reduce the friction force when pulling out the entire pull rope and the signal cable, facilitating the reuse of the pull rope from both ends. Description of the Drawings

[0024] Figure 1 is a schematic diagram of a tunnel when a waterproof board is arranged on the geotextile in an embodiment of the present invention; Figure 2 is a schematic diagram of a single signal cable passing through the weld channel in an embodiment of the present invention; Figure 3 is the first axonometric drawing of the scheme of the signal cable with a pull rope folded and exiting together in an embodiment of the present invention; Figure 4 is the present invention Figure 3 partial enlarged schematic diagram of A; Figure 5 is the second axonometric drawing of the scheme of the signal cable with a pull rope folded and exiting together in an embodiment of the present invention; Figure 6 is the present invention Figure 5 partial enlarged schematic diagram of B.

[0025] In the figure: 1 - waterproof board, 2 - signal cable, 3 - air pressure sensor, 4 - weld channel, 5 - pull rope, 6 - air pipe, 7 - water pipe. Detailed Embodiment

[0026] The following further explains the present invention in conjunction with the drawings and specific embodiments.

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. Components of the embodiments of this application usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of this application that is claimed, but merely represents selected embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0029] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0030] In the description of this application, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this application. In addition, in the description of this application, if terms such as "first", "second", etc. are only used for distinguishing descriptions, they cannot be understood as indicating or implying relative importance.

[0031] In addition, in the description of this application, if terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0032] In the description of this application, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "connected" are understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood in specific situations.

[0033] Embodiment 1: This embodiment discloses a leak tightness detection device for the welds of a tunnel waterproof board 1, mainly aiming at the leak tightness detection of the double welds formed by welding two welding rods inside the overlapping part of the polymer waterproof board 1 in the existing tunnel.

[0034] It should be noted that in the application scenario targeted by the detection device in this embodiment, referring to Figure 1 , the figure shows the process of laying the waterproof board 1 structure in the crown part of the tunnel. First, a geotextile layer is laid on the surface of its concrete layer structure, and then the geotextile layer is fixed by hot-melt gaskets with nails. Then, several arc-shaped waterproof boards 1 are arranged along the length direction of the tunnel on the crown arc surface of the geotextile layer, and the waterproof board 1 is fixed to the hot-melt gasket by ultrasonic welding.

[0035] The thickness of the waterproof board 1 is generally 2 - 2.5 mm, white and has a certain transparency. The width of the overlapping area is about 150 mm. When welding, welding rods with a distance not greater than 15 mm are arranged in the overlapping area. The two layers of waterproof boards 1 are clamped by a crawler welder at one end of the overlapping area and welded unidirectionally along the crown part of the tunnel, so as to form two welds with a length not less than 25 m. The space between the double welds is referred to as the weld channel 4 in the following content.

[0036] In order to solve the technical means of damaging the waterproof board 1 by the pin insertion method and subsequent need for repair welding in the prior art, the detection device in this embodiment includes a signal cable 2 with a length greater than 35 meters. Referring to Figure 2 , the signal cable 2 can be formed by shearing a single wire harness or formed by electrically connecting multiple sections of wire harnesses. It also includes several pressure sensors 3, and the pressure sensors 3 are arranged along the length direction of the signal cable 2, including two ways: evenly arranged at equal intervals and gradient arranged.

[0037] As an implementation method, the signal cable 2 is connected by a low-cost ordinary wire harness. The inner core is multi-strand copper wires with a diameter of 0.1 mm, using flexible FPC wiring or enameled wire stranding. The outer layer is a polyimide insulating layer, or directly connected by enameled wire without the need for external insulating layer protection, and can be enabled after a single layout.

[0038] The adopted pressure sensor 3 uses a small-sized MEMS pressure sensor 3. The signal cable 2 and the pressure sensor 3 use the I2C bus connection method for data transmission. The interval distance and size are set according to actual needs, and at least two are required at the lowest, and they are evenly arranged on the crown.

[0039] The signal cable 2 is placed in the space between the double welding rods before the double welding rods of the adjacent overlapping waterproof panels 1 are welded. The ends of the signal cable 2 pass through the two open ends of the weld channel 4 and are connected to the external data acquisition module. The data acquisition module in this embodiment adopts an I2C bus compatible STM32H7 microcontroller, polls the data of the air pressure sensor 3 at each point through the I2C bus, records the air pressure value through the built-in TF card, and then acquires and displays the data through an external laptop computer through USB or other means, so that the corresponding data can be obtained on site for real-time feedback.

[0040] The inflation and detection methods are as follows: The signal cable 2 arranged inside the double welding rod is welded by a climbing welding machine to form a double weld and a weld channel 4 in the double weld. Then the two openings of the weld channel 4 are blocked, one of the openings is connected to an external air compressor, and inflated with an air pressure of 0.25MPa. The signal cable 2 is connected to the external detection equipment to obtain the air pressure value of each point in real time. Once a leak is found, it is confirmed by spraying soapy water from the outside to check for bubbles, and then repaired from the outside by heat welding and tested again.

[0041] Furthermore, based on the above implementation, a specific method for arranging the signal cable 2 is provided, wherein the signal cable 2 and the air pressure sensor 3 are arranged together with the welding rod at one side edge of each coil when the coil is arranged, wherein the signal cable 2 and the air pressure sensor 3 are provided with terminals at both ends of the length direction of the coil for connecting to external air tightness detection equipment. In this way, the signal cable 2 is directly arranged along the top arch with the waterproof board 1 coil, which is more convenient and efficient than the method of laying it separately.

[0042] Furthermore, based on the above-mentioned embodiment, a specific method for arranging the signal cable 2 is provided. After the waterproof board 1 is arranged and forms an overlapping area with the adjacent waterproof board 1, the two waterproof boards 1 of the overlapping parts are placed in the welding slots of the climbing welding machine for welding from the opening part of the tunnel ground close to one side of the waterproof board 1. Before starting the climbing welding machine, the end of the prepared signal cable 2 whose length is greater than the length of the waterproof board 1 is connected to the climbing welding machine at a fixed position between the overlapping areas of the two waterproof boards 1 by providing a connecting end. The signal cable 2 is brought between the two welded fixed welds by the climbing welding machine, which also simplifies the installation process.

[0043] Among them, the so-called connecting end is a hook-like end, and there is a gap between the two pressure rollers of the climbing welding machine. The gap is the gap between the two welding rods. The climbing welding machine has a partition in the gap, which is detachably connected to the partition through the connecting end, so that it can be driven by the climbing welding machine to enter the weld channel 4 during the welding process.

[0044] It should be noted that in this method, in order to achieve a better traction effect, soapy water is continuously wiped on the surface of the cable when it enters the weld channel 4, thereby reducing its friction. At the same time, a protective structure that wraps part of the signal cable 2 can be provided on the inner partition of the welding machine. It has a certain structural strength, can avoid affecting the signal cable 2 during welding, and can also withstand a certain extrusion effect.

[0045] Furthermore, based on the above-mentioned implementation manner, a specific method for arranging the signal cable 2 is provided. Different from the above-mentioned arrangement of a single wire along the entire weld channel 4, two signal cables 2 of the same length are used. They are folded in half and the folded part is inserted into the weld channel 4. The two signal cables 2 are symmetrically arranged in the weld channel 4. In this way, the two ends of the two signal cables 2 are provided at both openings on both sides of the weld channel 4, and thus are synchronously controlled by connecting to a multi-port airtightness detection device.

[0046] In this way, the folded parts of the two signal cables 2 are arranged facing each other and close to each other in the space between the double electrodes. The pressure sensors 3 provided when each signal cable 2 is folded are arranged staggered. The interval distance between adjacent pressure sensors 3 of the signal cable 2 in the folded state is half of the interval distance between adjacent pressure sensors 3 on a single signal cable 2.

[0047] Based on this setting method, the two signal cables 2 are not connected in the weld channel 4. Compared with the whole arrangement method, this double-head symmetric setting method is more conducive to pulling out the two signal cables 2 from the weld channel 4 and then reusing them in the next weld airtightness detection.

[0048] In order to achieve better pulling and reuse and reduce the use of materials, another setting method is provided.

[0049] The midpoint of the signal cable 2 is divided into two sub-cables. The sub-cables have the same structure as the signal cable 2 and are also connected with several pressure sensors 3. However, the ends of the two sub-cables each have a chuck, and the chucks of the two sub-cables are simultaneously connected through a detachable connector provided.

[0050] Among them, the detachable connector has two bayonets. The size of the chuck is adapted to the size inside the bayonet and can be inserted into the bayonet to achieve connection. A raised first contact is provided on the end face of each bayonet, and a second contact corresponding to the first contact for conductive connection is provided at the end of the chuck. For each bayonet, a movable buckle structure is also provided. When the chuck is inserted into the bayonet, the buckle will elastically contract and correspondingly embed into the corresponding groove of the chuck to achieve clamping and limiting. The buckles in the two bayonets are mechanically controlled by a button provided on the detachable connector, that is, by pressing the button, the buckle can be released to achieve the disconnection / connection of the two sub-cables.

[0051] A detachable connector can be regarded as a structure with movable limits, in which a detachable conductive connection is achieved by means of contacts. In other embodiments, two chucks can be directly set as male and female head connectors without setting a detachable connector structure.

[0052] In this way, there will be an obvious button structure, which is distinguished from other structures by color. Even when it is inside the weld channel 4, its position can be determined by external viewing and pressed to achieve disassembly. During installation, the connected entire signal cable 2 can be arranged inside the weld channel 4. Once disassembly is required after the airtightness test is completed, personnel can directly reach the corresponding position and squeeze the button from the outside to release the sub-cables on both sides. Then, the respective sub-cables are pulled out through the ends of the signal cable 2 at the two openings on both sides of the weld channel 4 to complete the operation.

[0053] In order to achieve better protection and pulling method, this embodiment also provides an implementation method.

[0054] Along the length direction of the signal cable 2, a pulling rope 5 is also provided in the whole system. In this embodiment, the pulling rope 5 only refers to the material that provides axial tensile performance for the signal cable 2, and is not limited to its "rope" structure. The length of the pulling rope 5 itself is less than the total length of the signal cable 2. The air pressure sensor 3 is fixed on the surface of the pulling rope 5, and the signal cable 2 is divided into several sub-cables, which are respectively connected to two adjacent air pressure sensors 3. The length of the sub-cable between two adjacent air pressure sensors 3 is greater than the length of the pulling rope 5.

[0055] The pulling rope 5 is the same as the signal cable 2, and has a penetrated end at the two openings of the weld channel 4. This end is convenient for construction workers to pull. The pulling methods include manual pulling and pulling by a dragging mechanism. In this pulling method, only the end of the pulling rope 5 is fixed and pulled, and the whole pulling rope 5 bears the force. Since the air pressure sensor 3 is fixed in a point-fixed manner and the elastic deformation of the pulling rope 5 itself is small, it will not affect the air pressure sensor 3 and the signal cable 2.

[0056] As an implementation method, the pulling rope 5 is woven from nylon polymer material. The air pressure sensor 3 is fixed on the surface of the pulling rope 5 through a needle or other similar metal claw structure that longitudinally penetrates the axial direction of the pulling rope 5, and the signal cable 2 is attached to the surface of the pulling rope 5 or woven into the surface layer of the pulling rope 5, and has a certain length redundancy to avoid being affected by the pulling force.

[0057] As an implementation method, the pulling rope 5 is a nylon braided sleeve structure, sleeved outside the signal cable 2. The air pressure sensor 3 is fixed on the outside of the pulling rope 5 by means of clamping claws or braiding fixation, etc., and the signal cable 2 is wrapped by the pulling rope 5 and adopts a point-fixed method to achieve the effect of not being stressed.

[0058] As an implementation, the drawstring 5 itself is a tubular structure with a high-molecular nylon braided outer layer, and a rubber tube or corrugated tube inside, having certain compressive resistance. A number of air nozzle structures are arranged at equal intervals on the surface of the drawstring 5. The air nozzle structure is an opening structure with a metal-reinforced opening edge. The end of the drawstring 5 at one side of the opening of the weld channel 4 is connected to an external air compressor device, and 0.25 MPa of gas is introduced into the drawstring 5 by the external air compressor device to conduct an airtightness test on the space between the double electrodes.

[0059] In this implementation, the air pressure sensor 3 is fixed on the surface of the drawstring 5 and is arranged staggeredly with the air nozzles. The signal cable 2 connecting adjacent air pressure sensors 3 is arranged inside the drawstring 5 or within the inner wall of the drawstring 5.

[0060] As an implementation, at least two independent pipes with one end closed are inserted along the length direction of the drawstring 5. The pipes include an air pipe 6 that penetrates out of the space between the double electrodes and is connected to the air compressor device, and a water pipe 7 that is connected to the water pump. A number of air nozzles are arranged at intervals on the air pipe 6, and a number of nozzles are arranged at intervals on the water pipe 7. The nozzles and the air nozzles are arranged staggeredly along the length direction of the drawstring 5. 0.25 MPa of gas is introduced into the drawstring 5 by the external air compressor device to conduct an airtightness test on the space between the double electrodes. When there is a leakage point or the drawstring 5 needs to be pulled out, the external water pump injects soapy water into the water pipe 7 and sprays it out from the nozzles.

[0061] And a wire pipe for arranging the signal cable 2 is provided between the air pipe 6 and the water pipe 7 of the drawstring 5. The air pressure sensor 3 is arranged outside the wire pipe, and the signal cable 2 passes through the wire pipe and is connected to the air pressure sensor 3. In this way, due to the blockage of the material of the drawstring 5 prefabricated in the weld channel 4, compared with the existing empty arrangement method, it can ensure that at least one continuous and unobstructed air pipe 6 can conduct air, avoiding the local inflation effect that can only be formed by directly inserting a needle for ventilation. At the same time, when the drawstring 5 needs to be pulled out, the entire weld channel 4 is filled with a certain amount of soapy water, thereby reducing the friction force between the entire drawstring 5, the signal cable 2, the air pressure sensor 3 and the inner wall of the weld channel 4, so as to better pull out the entire drawstring 5.

[0062] For this embodiment, an operation detection method is provided. The pull rope 5 and the signal cable 2 are both arranged in two sets, and the waterproof board 1 is placed therebetween when it is arranged. After the seam welder finishes welding, an airtightness test is started. First, the openings on both sides of the weld channel 4 are blocked with stuffing to ensure the theoretical airtightness inside. Then, 0.25 MPa of gas is respectively introduced into the two air pipes 6 through a pneumatic device. After a certain period of time, the air pressure values of each pressure sensor 3 are obtained by supplying power through an external airtightness detection device. Since the position numbers of each pressure sensor 3 are determined and the relative positions of the weld channels 4 of the waterproof board 1 are fixed each time, it is basically possible to determine the air pressure values detected at fixed points. Once the situation of abnormal local air pressure values occurs, soapy water can be sprayed out from the entire water pipe 7, and then the construction workers can check the bubbles from the outside to determine the position. Compared with the existing method of spraying soapy water on the surface, spraying soapy water from the inside of the weld channel 4 to both sides can avoid the problem that soapy water cannot be applied to the inner welds.

[0063] Referring to Figures 3 - 6 , the figure shows a specific scheme of this embodiment. The pull rope 5 is designed with a double-pipe structure having a reinforcing braided layer. One side is the air pipe 6 and the other side is the water pipe 7. The cross-section of the pull rope 5 is elliptical in design, with an overall width less than 10 mm and a thickness less than 4 mm.

[0064] Among them, signal cables 2 are respectively provided at the upper and lower parts in the middle of the pull rope 5. Two pull ropes 5 are provided in the entire weld channel 4, and each side of the pull rope 5 has two ends through which a single signal cable 2 passes out. In this setting method, the pressure sensor 3 is fixed on the outer surface of the pull rope 5. In this embodiment, a patch-type MS5637-02BA03 micro pressure sensor is used, and its surface has two openings.

[0065] The present invention is not limited to the above optional embodiments, and anyone can obtain other various forms of products under the inspiration of the present invention. The above specific embodiments should not be construed as limiting the protection scope of the present invention. The protection scope of the present invention should be defined by the claims, and the description can be used to interpret the claims.

Claims

1. Tunnel waterproof board weld airtightness detection equipment, which is used for non-destructively detecting the airtightness of double welds at the lap joint of tunnel waterproof boards, and is characterized in that: It includes a signal cable and several air pressure sensors along the length direction of the signal cable and connected by the signal cable. Air tightness detection equipment is connected to both ends of the cable. The cable is placed in the space between double welding rods before double welding rods of adjacent overlapping waterproof plates are welded.

2. The airtightness detection device for the weld of the tunnel waterproof board according to claim 1, characterized in that: One end of the signal cable has a connection end connected to a climbing welding machine and enters into the space between the double welding rods along with the climbing welding machine.

3. The airtightness detection device for the weld of the tunnel waterproof board according to claim 1, characterized in that: The signal cable is arranged in the space between the double welding rods following the waterproof board when the waterproof board roll is deployed.

4. The airtightness detection device for the weld of the tunnel waterproof board according to claim 1, characterized in that: The signal cables include two, each of which is arranged in the space between the double welding rods in a folded manner, and both ends of each signal cable pass through the same side opening of the space between the double welding rods; The folded parts of the two signal cables are arranged facing each other and close to each other in the space between the double welding rods; The air pressure sensors provided on each signal cable are staggered when the signal cable is folded in half, and the spacing distance between adjacent air pressure sensors of the signal cable in the folded state is half of the spacing distance between adjacent air pressure sensors on a single signal cable.

5. The airtightness detection device for the weld of the tunnel waterproof board according to claim 1, characterized in that: The signal cable comprises at least two sub-cables, each sub-cable is connected by a detachable connector, the detachable connector comprises two bayonet ports with first contacts, the sub-cable comprises a bayonet port detachably connected to the port, the bayonet port comprises a second contact in contact with the first contact in conductive connection; The surface of the detachable connector is provided with a button for pressing and triggering, and the button is drivingly connected with a buckle arranged in the bayonet for clamping the limit clamp.

6. The airtightness detection device for the weld of the tunnel waterproof board according to claim 1, characterized in that: A pull rope is arranged along the length direction of the signal cable, and the pull rope is placed in the space between the double welding rods together with the signal cable, and at least one end of the pull rope is outside the opening of the space between the double welding rods; The air pressure sensor is fixed on the pull rope, and the length of the pull rope between adjacent air pressure sensors fixed on the pull rope is shorter than the length of the signal cable.

7. The airtightness detection device for the weld of the tunnel waterproof board according to claim 6, characterized in that: The pull rope is a tubular structure with one end of the inserted tube closed, and the other end of the pull rope passes through the space opening between the double welding rods and is connected to the external air compressor; Several air nozzles are arranged at intervals on the pull rope, and 0.25MPa gas is introduced into the pull rope by an external air compressor to test the air tightness of the space between the double welding rods.

8. The airtightness detection device for the weld of the tunnel waterproof board according to claim 7, characterized in that: The air pressure sensor is fixed on the surface of the pull rope and arranged alternately with the air nozzle, and the signal cable connecting the adjacent air pressure sensors is arranged inside the pull rope or inside the inner wall.

9. The airtightness detection device for the weld of the tunnel waterproof board according to claim 6, characterized in that: The pull rope is provided with at least two inserted independent pipes with one end closed along the length direction, and the pipes include an air pipe connected to the air compressor and a water pipe connected to the water pump, which pass through the space opening between the double welding rods; The air pipe is provided with a plurality of air nozzles at intervals, and the water pipe is provided with a plurality of nozzles at intervals, and the nozzles and the air nozzles are staggered along the length direction of the pull rope; The air tightness test of the space between the two electrodes is conducted by introducing 0.25MPa gas into the pull rope from an external air compressor. When there is a leak or the pull cord needs to be pulled out, soapy water is injected into the water pipe by an external water pump and sprayed out from the nozzle.

10. The airtightness detection device for the weld of the tunnel waterproof board according to claim 9, characterized in that: The pull rope is provided with a wire tube for arranging a signal cable between the air pipe and the water pipe, the air pressure sensor is arranged outside the wire tube, and the signal cable passes through the wire tube and is connected to the air pressure sensor.

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