Method for testing impermeability of lap-joint high-low difference waterproofing membrane joint

Abstract

The application relates to a method for detecting the water impermeability of a lap-jointed waterproof roll material joint, and is characterized by comprising the following steps: S1, sample pretreatment; and S2, sample detection. The application can not only eliminate the height difference of the roll material after lap joint, but also concentrate the pressure on the joint corresponding to the whole detection joint, while keeping the sample flat and the pressure on the lap joint uniform, preventing the lap joint from being depressed and collapsed due to the self weight, and accurately detecting the water impermeability of the waterproof roll material joint. On the other hand, the width of the detection joint can be adjusted, which not only meets the detection needs of different types of lap joint roll materials, but also can obtain the width corresponding to the limit water impermeability of the lap joint roll material by changing the size of the detection joint, so that the strength of the water impermeability of different roll materials and different lap joint widths can be determined.

Description

[0001] This application is a divisional application of application number 202110109995.5, filed on January 27, 2021, entitled "A Method for Testing the Waterproofness of Joints in Waterproof Membranes". Technical Field

[0002] This invention belongs to the field of waterproof membrane testing, specifically relating to a method for testing the impermeability of waterproof membrane joints after eliminating height differences following overlap. Background Technology

[0003] As is well known, waterproof membranes are different from waterproof coatings. In actual use, they need to be overlapped one by one to form a complete waterproof layer on a plane, thereby protecting the building structure from external water damage.

[0004] Therefore, the overlapping areas between rolls of waterproofing membrane are also high-risk areas for leakage. Regarding the effectiveness of these overlapping areas, domestic Chinese standards for waterproofing membranes generally use the "test method for seam peel strength" (for bituminous waterproofing membranes, see GB 18242-2008 "Elastomer Modified Bituminous Waterproofing Membranes," etc.; for polymer waterproofing membranes, see GB 12952-2011 "Polyvinyl Chloride (PVC) Waterproofing Membranes"). This method only reflects the adhesive performance at the overlapping areas and cannot reflect the water-resistant properties of these areas. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a novel method for testing the impermeability of waterproof membrane joints that eliminates height differences after overlapping.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A method for testing the impermeability of joints in waterproof membranes with height differences after overlapping, characterized by comprising the following steps:

[0008] S1, Sample Pretreatment

[0009] Two pieces of waterproof membrane are overlapped from the side, with an upper notch formed on the upper surface and a lower notch formed on the lower surface after the overlap. The width of the overlap seam is then determined. The upper and lower notches are filled and leveled with filler to eliminate the height difference after the overlap and obtain a sample.

[0010] S2, Sample Testing

[0011] First, remove the sample from S1 and cover the opening of the permeable plate of the impermeability tester with the sample, ensuring that the overlap of the sample is located in the middle of the permeable plate. Simultaneously, use an anti-dent bracket or pad to support the water-facing surface of the sample. Then, use a cover plate to press the sample onto the permeable plate. The cover plate has multiple slots in its center, spaced along the length of the overlap to form multiple test seams. The width of each test seam is adjustable relative to the slots. Each test seam intersects the overlap, and the length of each test seam covers the width of the corresponding section of the overlap below. Second, after the sample is installed, fill it with water and expel the air between the permeable plate and the water-facing surface of the sample. Observe whether water seeps out from the test seams during the test. If water seeps out, the waterproof membrane joint impermeability is unqualified; if no water seeps out, the waterproof membrane joint impermeability is qualified.

[0012] Preferably, the width of the inspection seam is less than or equal to 20 mm. This is to meet different inspection needs and increase practicality.

[0013] According to a specific embodiment and preferred aspect of the invention, each inspection seam extends along the width direction of the overlap seam and is evenly spaced along the length direction of the overlap seam. Here, the inspection seams and the length of the overlap seam are perpendicular to each other, resulting in uniform pressure on the roll material at the overlap seam and more accurate inspection results.

[0014] According to another specific embodiment and preferred aspect of the present invention, a through slot is formed in the cover plate, which is aligned with the length direction of the overlap seam. A slotted groove extends vertically through the through slot, and an insert plate is provided in the through slot of the cover plate. The insert plate has insert holes that extend in the same direction as the slotted groove and are arranged in a one-to-one correspondence with the slotted groove. When the insert plate moves and adjusts along the length direction of the overlap seam, the insert holes and the slotted groove are offset and overlapped to form a detection seam. Therefore, during the adjustment of the insert plate's movement, the formed detection seam is simultaneously enlarged or reduced. That is, the adjustable width of the detection seam meets the detection needs of different roll materials, and further, the ultimate impermeability of the overlap seam can be determined.

[0015] Preferably, the bottom edge of each slot is chamfered. The chamfer is mainly to prevent damage to the roll material caused by the slots when the joint is subjected to water pressure, which could lead to deviations in the test results. In some specific embodiments, the length of each slot is equal and greater than or equal to the width of the overlap joint. Generally, the length of the slot is slightly greater than the width of the overlap joint, which allows for more accurate test information.

[0016] In some specific embodiments, the cover plate has three slots, each of which extends along the width of the lap joint and is evenly spaced along the length of the lap joint.

[0017] According to another specific embodiment and preferred aspect of the present invention, in S1, the waterproof membrane is overlapped by adhesive, self-adhesion or welding according to the construction requirements of the waterproof membrane, and an overlap joint is formed, wherein the width of the overlap joint is 70-120mm.

[0018] Furthermore, during the overlapping of the roll material, a pressure roller is needed to roll back and forth along the length of the overlap. In some embodiments, the length of the pressure roller is 50-60 mm, and a pressure of 20-50 N is maintained on the overlap. This back-and-forth rolling motion ensures a good bond. Simultaneously, a silicone coating or adhesive roll material is used as filler to create a sample of uniform thickness. This ensures balanced stress distribution and improves the accuracy of the test results.

[0019] Preferably, in S2, the cover plate and the periphery of the permeable tray are sealed together by a sealing ring. The anti-dent bracket or the pad can flatten the sample from the overlapping seam. Meanwhile, the permeable tray is rectangular with rounded corners. This design improves the accuracy of the test results.

[0020] Furthermore, in S1, the samples with height differences after overlapping are placed at 23±2℃ for 24±1h for curing; in S2, the water pressure is adjusted to 0.1~0.6MPa according to the testing requirements, maintained for 120±10min, and it is observed whether water seeps out during the test. Due to the implementation of the above technical solutions, this invention has the following advantages compared with the prior art:

[0021] This invention not only eliminates the height difference of the overlapping roll material, but also concentrates the pressure on the joint corresponding to the entire test seam. At the same time, it keeps the specimen flat and the pressure on the roll material at the overlapping seam uniform, and prevents the overlapping seam from collapsing due to its own weight, thus enabling accurate testing of the waterproof roll joint impermeability. On the other hand, by adjusting the width of the test seam, it not only meets the testing needs of different types of overlapping roll materials, but also allows the width corresponding to the limit of waterproofness of the overlapping roll material to be obtained by changing the size of the test seam. This facilitates the statistical determination of the waterproofness of different roll materials and roll materials with different overlapping widths. Detailed Implementation

[0022] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, a detailed description of specific embodiments of this application is provided below. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0023] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating orientation or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0025] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0026] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0027] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0028] The method for testing the impermeability of waterproof membrane joints according to this embodiment mainly consists of three parts: S1, sample preparation; S2, sample installation; and S3, sample testing.

[0029] Specifically, S1, sample preparation: First, cut two rectangular pieces of waterproof membrane of the same shape and size, and overlap them vertically from the side along the length or width direction. The upper surface of the overlapped membrane forms an upper notch, and the lower surface forms a lower notch. The width of the overlap seam is 70-120mm. Then, fill the upper and lower notches with filler material and place them at 23±2℃ for 24±1h to complete the sample preparation.

[0030] In this example, two pieces of waterproof membrane are cut, with a length × width of 300mm × 400mm, and overlapped in the width direction, with an overlap size of 300mm × 100mm.

[0031] Meanwhile, the overlapping method is welding (such as hot welding), and a pressure roller with a weight of 2kg and a length of 50mm is used to roll back and forth the weld seam. In this way, the two rolls of material are stably bonded and the bonding force is relatively uniform.

[0032] Specifically, a silicone layer is applied as a filler to fill the corresponding upper and lower gaps, creating a test sample of uniform thickness. This ensures balanced stress distribution and improves the accuracy of the test results.

[0033] In this example, the overlapped sample was placed at 22℃ for 24 hours, and its length × width was 300mm × 300mm.

[0034] S2. Sample Installation: Take out the sample from S1 and cover the opening of the permeable plate of the impermeable instrument with the sample, so that the joint of the sample is located in the middle of the permeable plate. At the same time, use an anti-dent bracket or pad to support the water-facing surface of the sample. Then, use a cover plate to press the sample onto the permeable plate. The cover plate has multiple slots in the middle, each slot is perpendicular to the lap joint, and the length of each slot covers the width of the corresponding lap joint below.

[0035] Specifically, the cover plate has three slots, each extending along the width of the overlap joint and evenly spaced along its length. This allows for more accurate acquisition of inspection information.

[0036] The bottom edge of each slot is chamfered. In this example, the chamfer is rounded with a diameter of 0.5mm. The chamfer is mainly to prevent damage to the roll material caused by the slot when the joint is subjected to water pressure, which could lead to deviations in the test results.

[0037] Each slot is of equal length; in this example, the slot length is 110mm.

[0038] A through-slot is formed in the cover plate, aligned with the length of the overlap joint. A slotted groove extends vertically through the through-slot, and an insert plate is provided within the through-slot of the cover plate. The insert plate has insert holes that extend in the same direction as the slotted groove and correspond one-to-one with the slotted groove. When the insert plate moves and adjusts along the length of the overlap joint, the insert holes and slotted grooves are either offset or overlapped to form a test seam. Here, the adjustable width of the test seam meets the testing needs of different roll materials, further determining the ultimate water impermeability of the overlap joint.

[0039] In this example, the width of the inspection seam is 5mm. It should be noted that by changing the width of the inspection seam, the waterproof performance of the roll material with different overlap seams can be tested.

[0040] Specifically, the permeable plate has an inner cavity size of 270mm×270mm square, a depth of 6mm, and rounded corners to facilitate the installation of gaskets.

[0041] Because the seam-sealed impermeable specimens are larger and heavier after overlapping than ordinary impermeable specimens, and because the waterproof membrane itself is a flexible material, stainless steel supports or pads are installed in the permeable trays to prevent the specimens from collapsing under their own weight after installation on the impermeability tester. These supports are fixed in the center of each permeable tray of the impermeability tester, serving to support the specimens before the test begins. Once the test starts and pressure is applied, the supports cease to function. In this example, the support height is 6mm.

[0042] The cover plate is made of hard stainless steel and its size matches the permeable plate on the permeability meter. The size is approximately 360mm×360mm×6mm (length×width×height). When installing, make sure that the slot is perpendicular to the overlap of the roll material specimen.

[0043] In this example, the cover plate is detachably screwed onto the permeable plate of the impermeable meter by screws or bolts.

[0044] Meanwhile, the cover plate has three slots, each extending along the width of the overlap joint and evenly spaced along its length. This allows for more accurate acquisition of inspection information.

[0045] The bottom edge of each slot is chamfered. In this example, the chamfer is rounded with a diameter of 0.5mm. The chamfer is mainly to prevent damage to the roll material caused by the slot when the joint is subjected to water pressure, which could lead to deviations in the test results.

[0046] Each slot is of equal length; in this example, the slot length is 110mm.

[0047] A through-slot is formed in the cover plate, aligned with the length of the overlap joint. A slotted groove extends vertically through the through-slot, and an insert plate is provided within the through-slot of the cover plate. The insert plate has insert holes that extend in the same direction as the slotted groove and correspond one-to-one with the slotted groove. When the insert plate moves and adjusts along the length of the overlap joint, the insert holes and slotted grooves are either offset or overlapped to form a test seam. Here, the adjustable width of the test seam meets the testing needs of different roll materials, further determining the ultimate water impermeability of the overlap joint.

[0048] In this example, the width of the inspection seam is 5mm. It should be noted that by changing the width of the inspection seam, the waterproof performance of the roll material with different overlap seams can be tested.

[0049] S3. Test of the specimen: After the specimen is sealed and positioned, fill it with water and remove the air between the permeable plate and the water-facing surface of the specimen. Adjust the water pressure to 0.3MPa according to the test requirements and maintain it for 120±2min. Observe whether water comes out from the test joint during the test. If water comes out, it means that the waterproof membrane joint is not waterproof. If no water comes out, it means that the waterproof membrane joint is waterproof.

[0050] It should also be noted that, under the condition that all other conditions remain unchanged, if no water seeps out when the width of the test joint gradually increases, it indicates that the waterproof membrane joint has a stronger ability to prevent water leakage.

[0051] Therefore, this embodiment has the following advantages:

[0052] 1. By implementing the above steps, observe whether water seeps out from the test joint during the test. If water seeps out, it means that the waterproof membrane joint is not waterproof enough; if no water seeps out, it means that the waterproof membrane joint is waterproof enough. Therefore, it can accurately and quickly reflect the water resistance performance of the overlapping parts.

[0053] 2. By covering the lap joint with the slotted groove, the pressure is further concentrated on the joint corresponding to the entire slotted groove, thereby ensuring that the pressure on the roll material at the lap joint to be tested is uniform and improving the accuracy of the test results. At the same time, by eliminating the height difference of the sample after the overlap and combining it with the support of the anti-dent bracket or pad, the specimen is positioned flat, further improving the accuracy of the test results.

[0054] 3. By adjusting the width of the inspection seam, the inspection needs of different types of overlapping rolls can be met. On the other hand, by changing the size of the inspection seam, the width corresponding to the limit of water impermeability of the overlapping roll can be obtained, which facilitates the determination of the water impermeability of different rolls and rolls with different overlap widths.

[0055] The present invention has been described in detail above, with the aim of enabling those skilled in the art to understand and implement the invention. However, this description should not be construed as limiting the scope of protection of the invention. All equivalent changes or modifications made in accordance with the spirit and essence of the invention should be included within the scope of protection of the invention.

Claims

1. A method for testing the impermeability of joints in waterproof membranes with height differences after overlapping, characterized in that, It includes the following steps: S1, Sample Pretreatment Two pieces of waterproof membrane are overlapped from the side, with an upper notch formed on the upper surface and a lower notch formed on the lower surface after the overlap. The width of the overlap seam is then determined. The upper and lower notches are filled and leveled with filler to eliminate the height difference after the overlap and obtain a sample. S2, Sample Testing First, remove the sample from S1 and cover the opening of the permeable plate of the impermeability tester with the sample, ensuring that the overlap of the sample is located in the middle of the permeable plate. Simultaneously, use an anti-dent bracket or pad to support the water-facing surface of the sample. Then, use a cover plate to press the sample onto the permeable plate. The cover plate has multiple slots in its center, spaced along the length of the overlap to form multiple test seams. The width of each test seam is adjustable relative to the slots. Each test seam intersects the overlap, and the length of each test seam covers the width of the corresponding section of the overlap below. Second, after the sample is installed, fill it with water and expel the air between the permeable plate and the water-facing surface of the sample. Observe whether water seeps out from the test seams during the test. If water seeps out, the waterproof membrane joint impermeability is unqualified; if no water seeps out, the waterproof membrane joint impermeability is qualified.

2. The method for testing the impermeability of waterproof membrane joints after eliminating height differences following overlap, as described in claim 1, is characterized in that... The width of the detection seam is less than or equal to 20 mm.

3. The method for testing the impermeability of joints in waterproof membranes with height differences after overlap, as described in claim 1, is characterized in that... Each of the inspection seams extends along the width direction of the overlap seam and is evenly spaced along the length direction of the overlap seam.

4. The method for testing the impermeability of joints in waterproof membranes with height differences after overlap, as described in claim 1, is characterized in that... A through slot is formed in the cover plate, which is aligned with the length direction of the lap joint. The slot extends vertically through the through slot, and an insert plate is provided in the through slot of the cover plate. The insert plate has insert holes that extend in the same direction as the slot and are arranged one-to-one with the slot. When the insert plate moves and adjusts along the length direction of the lap joint, the insert holes and the slot are offset and overlapped to form the detection seam.

5. The method for testing the impermeability of waterproof membrane joints after eliminating height differences following overlap, as described in claim 1, is characterized in that... The bottom edge of each slot is chamfered; and / or, the length of each slot is equal and greater than or equal to the width of the lap joint.

6. The method for testing the impermeability of joints in waterproof membranes with height differences after overlap, as described in any one of claims 1 to 5, is characterized in that... The cover plate has three slots, each of which extends along the width of the overlap joint and is evenly spaced along the length of the overlap joint.

7. The method for testing the impermeability of waterproof membrane joints after eliminating height differences following overlap, as described in claim 1, is characterized in that... In S1, the waterproof membrane is overlapped by adhesive, self-adhesion or welding according to the construction requirements of the waterproof membrane, and an overlap joint is formed, wherein the width of the overlap joint is 70-120mm.

8. The method for testing the impermeability of joints in waterproof membranes with height differences after overlap, as described in claim 7, is characterized in that... The filler is either a silicone coating or a roll of material.

9. The method for testing the impermeability of joints in waterproof membranes with height differences after overlap, as described in claim 7 or 8, is characterized in that... While performing the roll material overlap, a pressure roller needs to be used to roll back and forth along the length of the overlap seam, while maintaining a pressure of 20-50N on the overlap seam.

10. The method for testing the impermeability of joints in waterproof membranes with height differences after overlap, as described in claim 1, is characterized in that... In S2, the cover plate and the periphery of the permeable plate are sealed together by a sealing ring, and the anti-dent bracket or the pad can flatten the sample from the overlap seam; and / or, in S1, the sample with the height difference after the overlap is placed in an environment of 23±2℃ for 24±1h to form curing; in S2, the water pressure is adjusted to 0.1~0.6MPa according to the test requirements, maintained for 120±10min, and it is observed whether water comes out during the test.