Tunnel waterproofing board weld air tightness testing equipment

Abstract

The present invention belongs to the technical field of air tightness testing, and discloses a tunnel waterproofing plate weld air tightness testing device, which is used for non-destructive testing of the air tightness of the double welds at the overlap of the tunnel waterproofing plates. The device comprises a signal cable and a plurality of air pressure sensors connected along the length of the signal cable through the signal cable. Air tightness testing devices are connected to both ends of the cable. The cable is placed in the space between the double welding rods before welding the double welding rods of adjacent overlapping waterproofing plates. The present invention solves the problem of existing destructive insertion testing by burying a signal cable with a plurality of air pressure sensors in the space between the double welds before or during welding, and sending an electrical signal through an externally connected air pressure testing device, and cooperating with the end inflation method to detect the air pressure changes in the narrow and long channel at multiple points.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel detection, and in particular relates to a device for detecting air tightness of a tunnel waterproofing plate weld. Background Art

[0002] During tunnel waterproofing construction, the arched areas of the tunnel, excluding the ground, are covered with a geotextile fabric on the surface of the concrete layer. A matrix of hot-melt gaskets is placed on the geotextile fabric surface, securing the geotextile to the concrete layer. The geotextile is then covered with a waterproofing board. External ultrasonic waves or other equipment are used to melt the inner hot-melt gaskets on the waterproofing board, securing them to the board. The hot-melt gaskets simultaneously secure the geotextile and waterproofing board layers, ensuring a non-destructive installation of the waterproofing board.

[0003] In the existing technology, waterproof sheet layers are generally made of polymer coils with a thickness of 1-3mm. The current waterproof sheet coils are generally about 4m wide. With the assistance of tunnel lining equipment for construction, waterproof sheet coils with a wider width can be used for laying, and the width can be extended to about 7m. When arranging the waterproof sheet, the coil will be unfolded and arranged along the top arch from one side of the ground to the other, and adjacent waterproof sheets will be connected and covered by overlapping. In order to form an integrated waterproof layer material in the tunnel, two welding rods will be set in the overlapping area of ​​two adjacent waterproof sheets. They will be welded from one side of the waterproof sheet using a climbing welding machine, and finally a double weld structure will be formed between the two adjacent waterproof sheets, thereby ensuring its waterproof connection effect.

[0004] For this double-weld structure, an air tightness test is required after construction. Most existing testing methods use an air tightness testing device with a needle to penetrate the space inside the double-weld structure from the outside to perform air pressure detection. Then, one side of the double-weld space opening is sealed, and 0.25MPa of gas is injected from the other side opening. The air pressure drop within ten minutes is detected. When the air pressure drops to no more than 10%, it is judged to be qualified. If it is greater than 10%, it is necessary to find the leak point by spraying soapy water on the surface to find bubbles, and then repair the leak point by welding.

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

[0006] First, existing waterproofing sheets are approximately 2mm thick, with an overlap width of 150mm. The resulting double weld seam is typically around 20mm wide and only 4mm thick. Polymer materials of this size are inherently soft when laid over large areas, which can lead to wrinkles at the joints. Workers can easily puncture both layers of waterproofing due to improper insertion. This insertion method also requires repair welding after testing, which presents operational difficulties.

[0007] Second, in existing large tunnels, the double-weld channel, which is only 20mm wide, is 30m long. Inserting needles to inflate air in such a narrow channel often results in partial narrowing and closure due to wrinkling or squeezing of the waterproofing sheet. Determining the airtightness of the entire weld cannot be done effectively at a single testing point; it is necessary to insert needles at at least multiple points along the arch to check for changes in air pressure. In practice, the top air pressure may be significantly low, making it impossible to determine whether there is a leak or a blockage in the inflation process, leading to repeated testing and even rework.

[0008] 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. The only way to check for leaks is to spray soapy water along the weld seam manually, which is very inefficient.

[0009] Fourth, when there is a leak, the bubbles can be checked by spraying soapy water on the outside to determine the leak point. However, at the joint of this 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, the soapy water on the surface cannot enter and cannot be injected through a needle. Now 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.

[0010] In the existing technology, 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. It is not efficient and cannot solve the subsequent three problems. Summary of the Invention

[0011] 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 space in the middle of the double welds to perform end inflation detection. It can solve the existing problem of damaging the waterproof board by inserting pins, and realize efficient inflation detection in a non-destructive way. It does not require manual reaching the top of the arch for pin insertion detection, and at the same time meets the existing standard requirements for inflation detection.

[0012] The technical solution adopted in the present invention is:

[0013] In the first aspect, the present invention provides a tunnel waterproofing plate weld air tightness detection device, which is used for non-destructive detection of the air tightness of the double welds at the overlap of the tunnel waterproofing plate, including a signal cable and several air pressure sensors along the length direction of the signal cable and connected by the signal cable. 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 plates are welded.

[0014] In combination with the first aspect, the present invention provides a first implementation of the first aspect, wherein one end of the signal cable has a connection end connected to a climbing welding machine and enters the space between the double welding rods with the climbing welding machine.

[0015] 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 sheet when the waterproof sheet roll is deployed.

[0016] In combination with the first aspect, the present invention provides a third embodiment of the first aspect, wherein the signal cables include two, each signal cable is arranged in a folded manner in the space between the two welding rods, and both ends of each signal cable pass through the same side opening of the space between the two welding rods;

[0017] The folded parts of the two signal cables are arranged facing each other and close to each other in the space between the two welding rods;

[0018] The air pressure sensors provided on each signal cable when folded in half are staggered, and the spacing between adjacent air pressure sensors of the signal cable in the folded state is half the spacing between adjacent air pressure sensors on a single signal cable.

[0019] It's worth noting that the so-called folding refers to folding a single signal cable in half at its midpoint to form two parallel signal cables, with the two ends facing in the same direction and the length halved. This method is suitable for tunnel arches with long layout lengths. During layout, the space between the two welding rods is divided into two parts along the midpoint of the length. Each part is equipped with a corresponding folded signal cable, which exits from a port corresponding to the two parts. Compared with the method of passing a single signal cable completely through the space between the two welding rods, this arrangement can reduce the layout length of the signal cables and enhance risk resistance.

[0020] It is also worth noting that a spacing distance L is set for adjacent air pressure sensors on a single signal cable. Compared with the solution of complete single line arrangement, the spacing distance L is doubled. Then, after the single signal cable is folded in half, it is staggered and arranged, 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.

[0021] In combination with the first aspect, the present invention provides a fourth implementation manner of the first aspect, wherein the signal cable includes at least two sub-cables, each sub-cable being connected via a detachable connector, the detachable connector including two bayonet holes having first contacts, the sub-cable having a bayonet for detachably engaging with the port, the bayonet having a second contact in contact with and electrically connected to the first contact in the bayonet hole;

[0022] The surface of the detachable connector is provided with a button for pressing and triggering, and the button is transmission-connected with a buckle arranged in the bayonet for clamping the limit clamp.

[0023] In combination with the first aspect, the present invention provides a fifth embodiment of the first aspect, wherein a pull rope is provided along the length direction of the signal cable, the pull rope is placed together with the signal cable in the space between the two welding rods, and at least one end of the pull rope is located outside the opening of the space between the two welding rods;

[0024] The air pressure sensors are 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.

[0025] A pull cord is a linear structure running along the length of the signal cable, primarily used for securing and bearing loads. To increase equipment reuse and reduce costs, a pull cord with axial tensile strength is used to securely connect the signal cable, with an external end for easy pulling. After the airtightness test is complete, the cord can be pulled through the opening between the two welding rods to pull the entire signal cable out of the ground and into the space between the two welding rods, allowing for airtightness testing on the welds of the next set of waterproof panels.

[0026] 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 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 force, and the signal cable is not under force, thereby avoiding damage.

[0027] 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 being closed for insertion, and the other end of the pull rope passes through the space opening between the two welding rods and is connected to an external air compressor.

[0028] Several gas 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 two welding rods.

[0029] 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.

[0030] 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, the pipes including an air pipe connected to an air compressor and a water pipe connected to a water pump, extending from the space opening between the two welding rods;

[0031] 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;

[0032] Use external air compressor to pass 0.25MPa gas into the pull rope to test the air tightness of the space between the two welding rods;

[0033] 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.

[0034] In combination with the eighth embodiment of the first aspect, the present invention provides a ninth embodiment of the first aspect, wherein the pull rope is provided with a wire pipe for arranging signal cables between the air pipe and the water pipe, 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.

[0035] The beneficial effects of the present invention are:

[0036] (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. In a non-destructive way, the air pressure value changes at several points can be obtained under the premise of reducing the risk of water seepage in the waterproof board. 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 detection accuracy.

[0037] (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 double welds formed, thereby avoiding the need to set up a separate signal cable and improving wiring efficiency;

[0038] (3) The present invention pre-places the signal cable between two welding rods by utilizing equipment that follows the laying of waterproof sheet coils, thereby achieving a pre-installation effect before the climbing welding machine, and also improving efficiency and saving time for separate wiring;

[0039] (4) The present invention divides a long channel into at least two parts by folding the signal cable in half. By utilizing the openings at both ends and the staggered arrangement of the air pressure sensors, the single signal cable that originally needed to be arranged along the entire length of the channel is divided into two parts at the highest point of the centerline of the top arch, providing the possibility of pulling out two signal cables from a single side opening. At the same time, the folded and staggered arrangement can also achieve uniform arrangement of the pressure sensors.

[0040] (5) The present invention further improves the feasibility of pulling out the signal cable and the air pressure sensor from the two side ports by providing a pull rope. At the same time, the pull rope itself bears the force, and the signal cable and the air pressure sensor are not subjected to force during the pulling process, thereby protecting the signal cable and the air pressure sensor as much as possible. At the same time, by means of built-in air pipes and water pipes, it can be ensured that after the double weld space is formed, the smooth flow of gas is guaranteed, thereby improving the detection efficiency. At the same time, by spraying water from the inside to both sides, it is not only possible to effectively check the feasibility of the existence of leakage points on both sides, but also when pulling out the entire pull rope and signal cable, soapy water can be injected into the middle space of the double weld to reduce friction, so that the pull rope can be easily pulled out from both ends for reuse. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 Schematic diagram of a tunnel in which a waterproof sheet is provided on a geotextile in an embodiment of the present invention;

[0042] Figure 2This is a schematic diagram of a single signal cable inserted into a weld channel in an embodiment of the present invention;

[0043] Figure 3 This is a first isometric view of a solution in which a signal cable with a pull cord is folded in half and extended outwards in an embodiment of the present invention;

[0044] Figure 4 This invention Figure 3 A local enlarged schematic diagram;

[0045] Figure 5 This is a second isometric view of a solution in which a signal cable with a pull cord is folded in half and extended outwards in an embodiment of the present invention;

[0046] Figure 6 This invention Figure 5 B is a partial enlarged schematic diagram.

[0047] 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 DESCRIPTION

[0048] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0050] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without making any creative efforts shall fall within the scope of protection of the present application.

[0051] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0052] In the description of this application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the product of the application is usually placed when in use. It is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation on this application. In addition, if the terms "first", "second", etc. appear in the description of this application, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0053] Furthermore, the use of terms such as "horizontal" and "vertical" in the description of this application does not necessarily imply that a component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical" and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0054] It should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. A person of ordinary skill in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0055] Example 1:

[0056] This embodiment discloses an air tightness detection device for the weld seams of a tunnel waterproofing board 1, which is mainly aimed at detecting the air tightness of double welds formed by welding double welding rods in the overlapping parts of existing waterproofing boards 1 made of polymer materials in tunnels.

[0057] It should be noted that, in the application scenario targeted by the detection device in this embodiment, reference is made to Figure 1 The figure shows the process of laying out the waterproof board 1 structure on the top arch 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 on the top arch surface of the geotextile layer along the length direction of the tunnel, and the waterproof boards 1 are fixed to the hot-melt gaskets by ultrasonic welding.

[0058] The thickness of the waterproof board 1 is generally 2-2.5mm, white and has a certain degree of transparency. The width of the overlapping area is about 150mm. During welding, welding rods are arranged with a distance of no more than 15mm in the overlapping area. The two layers of waterproof board 1 are clamped from one end of the overlapping area by a climbing welding machine and welded in one direction along the top arch part of the tunnel, thereby forming two welds with a length of no less than 25m. The space between the double welds is referred to as the weld channel 4 in the following content.

[0059] In order to solve the problem that the prior art uses a pin insertion method to damage the waterproof board 1 and subsequently requires repair welding, the detection equipment in this embodiment includes a signal cable 2 with a length greater than 35 meters. Figure 2 The signal cable 2 can be formed by cutting a single wire harness or by electrically connecting multiple wire harnesses. It also includes several air pressure sensors 3, which are arranged along the length of the signal cable 2, including two types of uniform arrangement with equal spacing and gradient arrangement.

[0060] As an implementation method, the signal cable 2 is connected by a low-cost ordinary wire harness, the inner core is a plurality of copper wires with a diameter of 0.1 mm, and a flexible FPC cable or enameled wire is twisted, and the outer layer is a polyimide insulation layer, or a direct enameled wire connection does not require an external insulation layer for protection, and can be activated after a single arrangement and use.

[0061] The air pressure sensor 3 used is a smaller MEMS air pressure sensor 3. The signal cable 2 and the air pressure sensor 3 are connected using an I2C bus for data transmission. The spacing and size are set according to actual needs. The minimum requirement is at least two, evenly arranged on the top arch.

[0062] The signal cable 2 is placed in the space between the double welding rods before the double welding rods of the adjacent overlapping waterproof boards 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 obtains and displays the data through an external laptop computer through USB or other means. The corresponding data can be obtained on site for real-time feedback.

[0063] The inflation and detection methods are as follows:

[0064] The signal cable 2, which is routed inside the double welding rods, is welded using a climbing welder to form a double weld seam and a weld channel 4 within the double weld seam. Both openings of the weld channel 4 are then sealed, with one opening connected to an external air compressor and inflated at 0.25 MPa. The signal cable 2 is then connected to external testing equipment to obtain real-time air pressure readings at various points. If a leak is found, it is confirmed by spraying soapy water on the outside to check for bubbles. A repair is then made from the outside using heat welding and retested.

[0065] Furthermore, based on the above embodiment, a specific method for arranging the signal cable 2 is provided. The signal cable 2 and air pressure sensor 3 are placed along the edge of each coil, along with the welding rod, during coil layout. The signal cable 2 and air pressure sensor 3 are each provided with terminals at both ends of the coil's length for connection to external airtightness testing equipment. In this method, the signal cable 2 is laid directly along the roof arch along with the waterproof sheet 1 coil, which is more convenient and efficient than laying the cable separately.

[0066] Furthermore, based on the above 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 from the opening part of the waterproof board 1 on one side close to the tunnel ground, and a climbing welding machine is used to weld them. Before starting the climbing welding machine, the end of the prepared signal cable 2 with a length greater than the length of the waterproof board 1 will be 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 climbing welding machine will bring the signal cable 2 between the two welded fixed welds, which also simplifies the installation process.

[0067] 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.

[0068] It is worth noting that in this method, in order to achieve a better pulling effect, soapy water is continuously wiped on the cable surface when it enters the weld channel 4, thereby reducing its friction. At the same time, a protective structure can be provided on the inner partition of the climbing welding machine to wrap part of the signal cable 2. This protective structure has a certain structural strength, which can prevent the signal cable 2 from being affected during welding, and can also withstand a certain degree of squeezing effect.

[0069] Furthermore, based on the above embodiment, a specific method for arranging the signal cable 2 is provided. Different from the above-mentioned single line arranged along the entire weld channel 4, two signal cables 2 of the same length are used, which are folded in half and inserted into the weld channel 4 at the folded part. The two signal cables 2 are symmetrically arranged in the weld channel 4. In this method, the two ends of the two signal cables 2 are provided at the openings on both sides of the weld channel 4, so that synchronous control is achieved by connecting to an airtightness detection device with multiple ports.

[0070] In this manner, the folded parts of the two signal cables 2 are arranged facing each other in the space between the double welding rods, and the air pressure sensors 3 provided on each signal cable 2 when folded are staggered. The spacing distance between adjacent air pressure sensors 3 of the signal cable 2 in the folded state is half the spacing distance between adjacent air pressure sensors 3 on a single signal cable 2.

[0071] Based on this setting, the two signal cables 2 are not connected in the weld channel 4. Compared with the whole arrangement, this double-headed symmetrical setting is more conducive to pulling the two signal cables 2 out of the weld channel 4 and then reusing them in the next weld air tightness test.

[0072] In order to achieve better pull-out reuse and reduce material usage, another setting method is provided.

[0073] The signal cable 2 is divided into two sub-cables at the midpoint. The sub-cables have the same structure as the signal cable 2 and are also connected to several air pressure sensors 3, but the ends of the two sub-cables each have a clamp, and the clamps of the two sub-cables are connected simultaneously through a detachable connector.

[0074] The detachable connector has two bayonet holes, the size of the bayonet head being compatible with the inner dimensions of the bayonet head, and capable of being inserted into the bayonet head to achieve a connection. Each bayonet head has a raised first contact on its end face, and a second contact at its end that is electrically connected to the corresponding first contact. Each bayonet head also has a movable buckle structure. When the bayonet head is inserted into the bayonet head, the buckle will elastically contract and fit into the corresponding slot of the bayonet head to achieve a fixed position. The buckles in the bayonet heads on both sides are mechanically controlled by a button set on the detachable connector. That is, by pressing the button, the buckle can be released to disconnect / connect the sub-cables on both sides.

[0075] The so-called detachable connector can be regarded as a structure with movable limit, in which a detachable conductive connection is achieved by means of contacts. In other embodiments, the two clamps can be directly set as male and female connectors without setting a detachable connector structure.

[0076] In this method, there is a distinct button structure, distinguished by color from other structures. Even if it is inside the weld channel 4, its position can be determined by external inspection and pressed to release it. During installation, the entire connected signal cable 2 can be placed inside the weld channel 4. Once the airtightness test is completed and it needs to be removed, personnel can directly reach the corresponding position and squeeze the button from the outside to release the sub-cables on both sides. Then, through the ends of the signal cable 2 at the openings on both sides of the weld channel 4, the respective sub-cables are pulled out to complete the operation.

[0077] In order to achieve better protection and pulling method, this embodiment also provides an implementation method.

[0078] The entire system also features a drawstring 5 running along the length of the signal cable 2. In this embodiment, the drawstring 5 refers only to the material that provides axial tensile strength to the signal cable 2 and is not limited to a "rope" structure. The drawstring 5 itself is shorter than the total length of the signal cable 2. The air pressure sensor 3 is affixed to the drawstring 5, while the signal cable 2 is divided into several sub-cables, each connecting two adjacent air pressure sensors 3. The sub-cables between two adjacent air pressure sensors 3 are longer than the drawstring 5.

[0079] Like the signal cable 2, the pull cord 5 has protruding ends at the two openings of the weld channel 4, allowing workers to easily pull it. This pulling method includes manual pulling and dragging. In this pulling method, only the ends of the pull cord 5 are fixed and pulled, and the entire pull cord 5 bears the load. Since the air pressure sensor 3 is fixed at a point, the elastic deformation of the pull cord 5 is small, which will not affect the air pressure sensor 3 or the signal cable 2.

[0080] As an embodiment, the pull rope 5 is woven with nylon polymer material, and the air pressure sensor 3 is fixed to the surface of the pull rope 5 by a needle or other metal claw-like structure that passes longitudinally through the axial direction of the pull rope 5, and the signal cable 2 is attached to the surface of the pull rope 5, or is woven into the surface layer of the pull rope 5, and has a certain length redundancy to avoid being affected by tension.

[0081] As an implementation method, the pull rope 5 is a nylon braided sleeve structure, which is sleeved on the outside of the signal cable 2. The air pressure sensor 3 is fixed to the outside of the pull rope 5 by clamping or braiding, and the signal cable 2 is wrapped by the pull rope 5 and point-fixed to achieve the effect of being free from force.

[0082] In one embodiment, the pull cord 5 itself is a tubular structure with a high-molecular-weight nylon braided outer layer and a rubber tube or bellows interior, providing a certain degree of pressure resistance. Several air nozzles are evenly spaced on the surface of the pull cord 5. These air nozzles are open structures with metal-reinforced opening edges. The open end of the pull cord 5 on one side of the weld channel 4 is connected to an external air compressor. This external air compressor introduces 0.25MPa gas into the pull cord 5 to test the airtightness of the space between the two welding rods.

[0083] In this embodiment, the air pressure sensors 3 are fixed on the surface of the pull rope 5 and arranged alternately with the air nozzles, and the signal cables 2 connecting adjacent air pressure sensors 3 are arranged inside the pull rope 5 or inside the inner wall.

[0084] As an embodiment, the pull rope 5 is provided with at least two independent pipes with one end closed along the length direction, and the pipes include an air pipe 6 connected to the air compressor equipment and a water pipe 7 connected to the water pump passing through the space opening between the double welding rods; a plurality of air nozzles are provided at intervals on the air pipe 6, and a plurality of nozzles are provided at intervals on the water pipe 7, and the nozzles and the air nozzles are staggered along the length direction of the pull rope 5; 0.25MPa gas is introduced into the pull rope 5 by an external air compressor to test the air tightness of the space between the double welding rods; when there is a leak or the pull rope 5 needs to be pulled out, soapy water is injected into the water pipe 7 by an external water pump and sprayed out by the nozzle.

[0085] The pull rope 5 is provided with a wire tube for arranging the signal cable 2 between the air pipe 6 and the water pipe 7. The air pressure sensor 3 is arranged outside the wire tube, and the signal cable 2 passes through the wire tube to connect with the air pressure sensor 3. In this way, due to the obstruction of the pull rope 5 material prefabricated in the weld channel 4, compared with the existing vacant method, it can ensure that at least one continuous through air pipe 6 can be ventilated, avoiding the direct use of a needle to insert ventilation method that can only form a local inflation effect. At the same time, when it is necessary to pull out and lift, the entire weld channel 4 is filled by injecting a certain amount of soapy water, thereby reducing the friction between the entire pull rope 5, signal cable 2, air pressure sensor 3 and the inner wall of the weld channel 4, so that the entire pull rope 5 can be pulled out better.

[0086] In view of this embodiment, an operation detection method is provided, in which the pull rope 5 and the signal cable 2 are both arranged in two ways, and are placed in the waterproof board 1 when arranging the waterproof board 1. After the climbing welding machine completes the welding, the air tightness test is started. First, the openings on both sides of the weld channel 4 are sealed with plugging materials to ensure the theoretical air tightness inside. Then, 0.25MPa of gas is introduced into the two air pipes 6 respectively through the air compressor. After a certain period of time, the air pressure value of each air pressure sensor 3 is obtained by powering the external air tightness detection equipment. Since the position number of each air pressure sensor 3 is determined, the relative position of the weld channel 4 placed on the waterproof board 1 is fixed each time, so it is basically possible to determine the air pressure value at a fixed point. Once a local air pressure value is abnormal, soapy water can be sprayed on the entire water pipe 7, and then the construction personnel can check the bubble 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 of not being able to apply soapy water to the inner weld.

[0087] Reference Figure 3-Figure 6 The figure shows a specific scheme of this embodiment. The pull rope 5 is a double-pipe structure design with a reinforced braided layer, one side of which is an air pipe 6 and the other side is a water pipe 7. The cross-section of the pull rope 5 is an elliptical design, the overall width is less than 10 mm, and the thickness is less than 4 mm.

[0088] The upper and lower sections of the middle portion of the pull cord 5 are each provided with a signal cable 2. Two pull cords 5 are positioned within the entire weld channel 4, with each end of the pull cord 5 having two ends through which a single signal cable 2 passes. In this arrangement, the air pressure sensor 3 is affixed to the outer surface of the pull cord 5. In this embodiment, a patch-type MS5637-02BA03 micro pressure sensor is used, which has two openings on its surface.

[0089] The present invention is not limited to the above optional embodiments. Anyone can derive various other forms of products based on the teachings of the present invention. The above specific embodiments should not be construed as limiting the scope of protection of the present invention. The scope of protection of the present invention shall be based on the scope defined in the claims, and the description can be used to interpret the claims.

Claims

1. Tunnel waterproofing board weld air tightness testing equipment is used for non-destructive testing of the double weld air tightness at the overlap of tunnel waterproofing boards. It is characterized by: It includes a signal cable and several air pressure sensors connected along the length of the signal cable through the signal cable. Both ends of the cable are connected to air tightness detection equipment. The cable is placed in the space between the double welding rods of adjacent overlapping waterproof boards before welding. A pull rope is provided along the length direction of the signal cable. The pull rope is placed in the space between the two 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 two 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; The pull rope is provided with at least two independent pipes with one end closed along the length direction, the pipes including 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 two 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; Use external air compressor to pass 0.25MPa gas into the pull rope to test the air tightness of the space between the two welding rods; 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.

2. The tunnel waterproofing plate weld air tightness detection equipment 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 the space between the double welding rods along with the climbing welding machine.

3. The tunnel waterproofing plate weld air tightness detection equipment according to claim 1, characterized in that: When the waterproof sheet coil is deployed, the signal cable is arranged in the space between the double welding rods following the waterproof sheet.

4. The tunnel waterproofing plate weld air tightness detection equipment according to claim 1, characterized in that: The signal cables include two, each signal cable is arranged in the space between the two welding rods in a folded manner, and both ends of each signal cable pass through the opening on the same side of the space between the two 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 two welding rods; The air pressure sensors provided on each signal cable when folded in half are staggered, and the spacing between adjacent air pressure sensors of the signal cable in the folded state is half the spacing between adjacent air pressure sensors on a single signal cable.

5. The tunnel waterproofing plate weld air tightness detection equipment according to claim 1, characterized in that: The signal cable includes at least two sub-cables, each sub-cable is connected by a detachable connector, the detachable connector includes two bayonet ports with first contacts, the sub-cable has a bayonet port that is detachably engaged with the port, and the bayonet port has a second contact that is in conductive contact with the first contact in the bayonet port; The surface of the detachable connector is provided with a button for pressing and triggering, and the button is transmission-connected with a buckle arranged in the bayonet for clamping the limit clamp.

6. The tunnel waterproofing plate weld air tightness detection equipment according to claim 1, characterized in that: The pull rope is a tubular structure with one end of the inserted end being 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 device.

7. The tunnel waterproofing plate weld air tightness detection equipment according to claim 6, characterized in that: The air pressure sensor is fixed on the surface of the pull rope and is arranged in a staggered manner with the air nozzle. The signal cable connecting adjacent air pressure sensors is arranged inside the pull rope or inside the inner wall.

8. The tunnel waterproofing plate weld air tightness detection equipment according to claim 1, characterized in that: The pull rope is provided with a wire pipe for arranging a signal cable between the air pipe and the water pipe. 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.

Images