Device suitable for detecting air tightness of embedded waterproof plate in tunnel

Abstract

The utility model discloses a device suitable for detecting the air tightness of a pre-embedded waterproof plate in a tunnel, relates to the field of tunnel construction quality detection instruments, and provides a device suitable for detecting the air tightness of a pre-embedded waterproof plate in a tunnel, which is characterized by comprising a detection structure arranged in a welding seam of a first waterproof plate and a second waterproof plate, the air tightness detector is connected with the detection structure; the detection structure comprises a main body needle head and a bidirectional needle head integrally formed with the main body needle head, and the main body needle head is connected with the air tightness detector. According to the utility model, the bidirectional needle head is arranged at a position to be detected in advance without influencing the lap welding between the waterproof plates, so that engineering detection technicians can carry out rapid, simple and convenient air tightness detection at any time and do not need to manually heat and seal the detected part by using a hot air welding gun.

Description

Technical Field

[0001] The utility model relates to the field of tunnel construction quality detection instruments, in particular to a device suitable for detecting the air tightness of pre-buried waterproof plates in tunnels. Background Art

[0002] During tunnel construction, the waterproof layer is set between the initial support and the secondary lining. The waterproof layer is the core of tunnel waterproofing. The quality of its laying directly affects the water leakage of the tunnel, and thus affects the safety of the tunnel. During the tunnel construction process, it is extremely important to inspect the laying and overlap of the waterproof board to ensure that the tunnel is leak-proof. For this purpose, it is necessary to conduct airtightness testing on the welds at the overlaps.

[0003] Currently, the inflation method is used to check the welding quality of the waterproof layer. The No. 3 injection needle is connected to the pressure gauge and inflated with an air pump. When the pressure reaches 0.25MPa, stop inflating and keep it for 15 minutes. If the pressure drops within 10%, it means that the weld is qualified. If the pressure drops too quickly, it means that there is something not welded well. Apply soapy water on the weld and re-weld the areas with bubbles until there is no leakage.

[0004] This detection method is very destructive to the welds at the overlapping joints of the waterproof boards, and it is difficult for the needle to penetrate the welds at the overlapping joints of the waterproof boards. The needle often breaks or penetrates the waterproof boards, which may eventually lead to poor detection results and water seepage through the waterproof boards, posing certain safety hazards to the later anti-seepage measures in the tunnel. Utility Model Content

[0005] In response to the above-mentioned problems, the present invention aims to provide a device suitable for detecting the air tightness of pre-buried waterproof panels in tunnels, which can realize non-destructive, fast and safe detection of the air tightness of waterproof panels in tunnels.

[0006] The main idea of ​​the technical solution adopted by this utility model is: a device suitable for air tightness testing of pre-buried waterproof panels in tunnels. This device uses a bidirectional needle to be arranged in advance at the position to be tested, and does not affect the overlap welding between waterproof panels. Engineering testing technicians can perform quick and easy air tightness testing at any time without having to manually use a hot air welding gun to heat and seal the inspection area. After the test is completed, the reserved opening can be sealed with a sealing clamp. It can not only perform effective air tightness testing without damaging the waterproof panels, but also realize the concept of non-destructive testing, making the test personnel's operation faster and safer. This also brings safety guarantees for the subsequent waterproofing of the tunnel, saves a lot of manpower, material and financial resources, and provides support for the timely delivery and use of the tunnel with guaranteed quality and quantity.

[0007] In order to achieve the above purpose, the technical solutions adopted by this utility model are as follows:

[0008] A device suitable for detecting the air tightness of pre-buried waterproof panels in tunnels, characterized by comprising: a detection structure provided in the weld between a first waterproof panel and a second waterproof panel, and an air tightness detector connected to the detection structure;

[0009] The detection structure includes a main needle and a bidirectional needle integrally formed with the main needle, and the main needle is connected to an airtightness detector.

[0010] Furthermore, the weld includes a No. 1 weld and a No. 2 weld, and the bidirectional needle is located between the No. 1 weld and the No. 2 weld.

[0011] Furthermore, a sealing connection tube connected to the air tightness detector is reserved on the main needle, one end of the sealing connection tube is connected to the main needle, and the other end is connected to the air tightness detector.

[0012] Furthermore, the main needle head is also provided with an adhesive sheet for fixing the main needle head and the waterproof plate together.

[0013] Furthermore, a sealing clamp is provided on the sealing connection tube.

[0014] The beneficial effects of the present invention are as follows: Compared with the prior art, the improvements of the present invention are:

[0015] The bidirectional structure of the bidirectional needle makes it easier for gas to fill the gaps between the welds of the waterproofing board. Compared with the previous method of puncturing with a needle and one-way inflation, the detection is more accurate and time-saving.

[0016] In the past, after the air tightness test between welds was completed, it was necessary to use a hot air welding gun to seal the puncture of the needle to prevent air and water leakage. The use of sealing clamps in this application can achieve a better sealing effect and save testing time.

[0017] By pre-positioning the bidirectional needle at the location to be tested without interfering with the lap welds between the waterproofing panels, engineering inspection technicians can quickly and easily perform airtightness testing at any time, eliminating the need for manual heating and sealing of the inspection area with a hot air welding torch. After the test is complete, the reserved opening is sealed with a sealing clamp. This not only enables effective airtightness testing without damaging the waterproofing panels, fulfilling the concept of non-destructive testing, but also makes the operation faster and safer for inspectors. This also provides a safer guarantee for subsequent water seepage prevention in the tunnel, saves considerable manpower, material, and financial resources, and supports the on-schedule, high-quality, and high-quality delivery of the tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the waterproof board of the utility model.

[0019] Figure 2This is a schematic diagram of the main needle and bidirectional needle structure of the utility model.

[0020] Figure 3 This is a structural diagram of the connection between the detection structure and the sealing connection pipe of the utility model.

[0021] Figure 4 This is a schematic diagram of the detection structure with an adhesive sheet of the utility model.

[0022] Figure 5 This is a diagram showing the actual operation effect of the detection structure of the utility model on the waterproof board.

[0023] Among them: 1. No. 1 waterproof board, 2. No. 2 waterproof board, 3. No. 1 welding seam, 4. No. 2 welding seam, 5. Main needle, 6. Sealing clamp, 7. Sealing connecting tube and main needle interface, 8. Adhesive piece, 9. Sealing connecting tube and air tightness tester interface, 10. Bidirectional needle, 11. Sealing connecting tube. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0025] In the existing testing process, the needle is punctured and the air is inflated in one direction. In order to stabilize the needle, the personnel need to press the inflation port. During this process, the waterproof board will fold, which will cause the needle to move in the opposite direction and the air filling will not be dense. On the one hand, it will lead to test failure, and on the other hand, it may be possible to incompletely test the entire weld. Therefore, this application discloses a device suitable for testing the air tightness of pre-buried waterproof boards in tunnels, which can realize non-destructive, fast and safe testing of the air tightness of waterproof boards in tunnels. Figure 1-Figure 5 , the device specifically includes a detection structure provided in the weld of the first waterproof board 1 and the second waterproof board 2, and an airtightness detector connected to the detection structure;

[0026] The detection structure includes a main needle 5 and a bidirectional needle 10 integrally formed with the main needle 5. The main needle 5 is connected to the airtightness detector.

[0027] It should be noted that the main needle 5 and the bidirectional needle 10 integrally formed with the main needle 5 are both made of stainless steel.

[0028] like Figure 1As shown, due to the large overlapping area of ​​waterproof sheet No. 1 and waterproof sheet No. 2, two welds are provided, namely, weld seam No. 1 3 and weld seam No. 2 4, with a bidirectional needle 10 located between weld seam No. 1 3 and weld seam No. 2 4. In accordance with regulatory requirements, parameters such as the overlap length, weld seam width, and weld seam spacing of the waterproof sheets are measured on-site, and the length of the embedded bidirectional needle 10 is appropriately set. Specifically, the embedded length is 1 cm, the knot width between waterproof sheet No. 1 1 and waterproof sheet No. 2 2 must not be less than 10 cm, the weld seam widths of weld seam No. 1 3 and weld seam No. 2 4 are both 1 cm, the spacing between weld seam No. 1 3 and weld seam No. 2 4 is 3 cm, and the spacing from the overlapping edge of the waterproof sheets to the center between the two welds is 5 cm.

[0029] Specifically, such as Figure 2 and Figure 3 As shown, each bidirectional needle tip 10 has a diameter of 60.5 mm and is 2.5 cm long. The main needle tip 5 is 7 cm long, and the sealing connection tube 11 between the main needle tip 5 and the airtightness tester has a diameter of 1 cm. The main needle tip 5 has a reserved sealing connection tube 11 for connecting to the airtightness tester to ensure the seal during waterproof board testing. One end of the sealing connection tube 11 is connected to the main needle tip 5 through the sealing connection tube and the main needle tip interface 7. The other end of the sealing connection tube 11 is connected to the airtightness tester through the sealing connection tube and the airtightness tester interface 9.

[0030] It should be noted that the sealing connection tube 11 is a soft plastic tube, which is sleeved on the outside of the sealing connection tube and the main needle interface 7. The airtightness tester is an existing product and this application has not improved it. Its specific model is the needle-type waterproof board weld tester DFQ-1.

[0031] The main needle head 5 is also provided with an adhesive sheet 8 for fixing the main needle head 5 to the waterproof board. A sealing clamp 6 is provided on the sealing connection tube 11. Specifically, the position is pre-set through the gap at the overlap of the No. 1 waterproof board 1 and the No. 2 waterproof board 2, and the climbing welding machine is controlled to perform welding. When the climbing welding machine welds to this point, the manual operation skips this area, and a hot air welding gun is used for local welding. The set bidirectional needle head 10 is buried in the No. 1 welding seam 3 and the No. 2 welding seam 4 of the No. 1 waterproof board 1 and the No. 2 waterproof board 2. Do not flatten the bidirectional needle head 10 when burying it to ensure smooth flow of gas during the subsequent test inflation. An adhesive sheet 8 and a sealing clamp 6 are provided on the sealing connection tube 11 between the main needle head 5 and the air tightness detector, such as Figure 4 As shown, the main needle 5 is pasted on the overlap of the No. 1 waterproof board 1 and the No. 2 waterproof board 2 through the adhesive sheet 8 before pre-embedded welding, and is sealed with a sealing clamp 6 after the test is completed. Example

[0032] After the technicians have set up the air tightness detection points of the waterproof board according to the actual situation on site and the requirements of the specifications, first, fix the main needle 5 with the adhesive sheet 8 provided on it to the end where the No. 1 waterproof board 1 and the No. 2 waterproof board 2 overlap and leak, and then control the climbing welding machine to perform welding. Because the climbing welding machine adopts seamless welding, the manual operation skips this area when the climbing welding machine welds to this point, and uses a hot air welding gun to perform local welding. The welding here is firmly welded to achieve sealing, and then the inflation method is used to check the welding quality of the waterproof layer. The main needle 5 is connected to the air tightness tester and inflated with an air pump. When the air tightness tester reaches 0.25MPa, stop inflating. After maintaining for 15 minutes, the pressure drops within 10%, indicating that the weld is qualified. If the pressure drops too fast, it means that there is something not welded well. Apply soapy water on the weld and re-weld the areas with bubbles until there is no leakage. After the air tightness test task is completed, use the sealing clamp 6 to clamp the middle of the sealing connection pipe 11, remove the connection between the air tightness detector and the connection pipe, and complete the non-destructive testing task.

[0033] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A device for detecting the air tightness of pre-buried waterproof panels in tunnels, characterized by: It includes a detection structure provided in the weld of the first waterproof plate (1) and the second waterproof plate (2), and an airtightness detector connected to the detection structure; The detection structure comprises a main needle (5) and a bidirectional needle (10) integrally formed with the main needle (5); the main needle (5) is connected to an airtightness detector.

2. The device for detecting air tightness of pre-buried waterproof panels in tunnels according to claim 1, characterized in that: The weld seam comprises a No. 1 weld seam (3) and a No. 2 weld seam (4), and the bidirectional needle (10) is located between the No. 1 weld seam (3) and the No. 2 weld seam (4).

3. The device for detecting air tightness of pre-buried waterproof panels in tunnels according to claim 2, characterized in that: A sealing connection tube (11) connected to the airtightness detector is reserved on the main needle head (5); one end of the sealing connection tube (11) is connected to the main needle head (5), and the other end is connected to the airtightness detector.

4. The device for detecting air tightness of pre-buried waterproof panels in tunnels according to claim 3, characterized in that: The main needle head (5) is also provided with an adhesive sheet (8) for fixing the main needle head (5) and the waterproof plate together.

5. The device for detecting air tightness of pre-buried waterproof panels in tunnels according to claim 3, characterized in that: A sealing clamp (6) is provided on the sealing connection tube (11).

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