A freeze-thaw cycle method and test device for waterproofing membrane lap seams

Abstract

The application relates to a freeze-thaw cycle method and a test device for a lap joint of a waterproof roll material, and the freeze-thaw cycle method comprises the following steps: S1, a mold base layer with an arc-shaped cross section is prepared; S2, two waterproof roll materials with appropriate sizes are cut according to the size of the mold base layer; S3, the two waterproof roll materials are laid on the mold base layer by adopting an empty paving method or a full sticking method, wherein the lap edges of the two waterproof roll materials are fixedly lapped on the top of the arc of the mold base layer, and the trend of the lap edges is parallel to the longitudinal direction of the mold base layer; S4, a plurality of test pieces are prepared according to the steps of S1, S2 and S3, wherein one is a reference test piece, and the rest are test test pieces; S5, the test test pieces are placed in a freeze-thaw cycle test machine, and temperature and time are set to perform freeze-thaw cycle; S6, the test test pieces after the freeze-thaw treatment are taken out, and the test test pieces and the reference test piece are respectively tested for a plurality of performances and compared; the method realizes detection on the lap joint of the waterproof roll material.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waterproofing membrane performance detection, in particular to a freeze-thaw cycle method and test device for a lap joint of a waterproofing membrane. BACKGROUND

[0002] The waterproofing membrane is mainly used for building walls, roofs, tunnels, highways, landfills and the like, and serves to resist the infiltration of external rainwater and groundwater. It is a flexible building material product that can be rolled into a roll. It is a non-leakage connection between the engineering foundation and the building, and is the first barrier of the entire engineering waterproofing. It plays a crucial role in the entire project.

[0003] When the roof construction is carried out in winter, the water content of the roof concrete floor will increase dramatically due to the long-term rain and snow weather in winter. The concrete strength grows slowly in a low-temperature environment, and the concrete surface layer is prone to cracking and sanding under repeated freeze-thaw action, thereby causing air pockets between the waterproofing membrane and the concrete surface layer. Later, due to the influence of solar radiation and temperature rise, water vapor is formed by evaporation and vaporization of water in the base layer, and the asphalt waterproofing membrane in the area with insufficient adhesion expands and deforms, especially at the lap joint of the waterproofing membrane, which is prone to separation at the lap joint, resulting in roof waterproofing damage.

[0004] However, there are few test methods for lap joints in the current product standards for waterproofing membranes, and standard detection of freeze-thaw cycles of lap joints cannot be performed. Therefore, the present application provides a freeze-thaw cycle method and test device for a lap joint of a waterproofing membrane. SUMMARY

[0005] In order to realize freeze-thaw cycle detection of the lap joint of the waterproofing membrane, the present application provides a freeze-thaw cycle method and test device for a lap joint of a waterproofing membrane.

[0006] In a first aspect, the present application provides a freeze-thaw cycle method for a lap joint of a waterproofing membrane, which adopts the following technical solution:

[0007] A freeze-thaw cycle method for a lap joint of a waterproofing membrane, comprising the following steps:

[0008] S1, a mold base layer with an arc-shaped cross-section is prepared first;

[0009] S2, two waterproofing membranes with appropriate sizes are cut according to the size of the mold base layer;

[0010] S3, the two waterproofing membranes are laid on the mold base layer using the air-laid method or the full-adhesion method, wherein the lap edges of the two waterproofing membranes are fixedly lapped at the top of the circular arc of the mold base layer, and the direction of the lap edges is parallel to the longitudinal direction of the mold base layer;

[0011] S4, preparing a plurality of test pieces according to the steps of S1, S2 and S3, wherein one of the test pieces is a reference test piece and the rest are test test pieces;

[0012] S5, placing the test test pieces into a freeze-thaw cycle testing machine, setting the temperature and time for freeze-thaw cycle, freezing at a temperature of -28℃ to -5℃ for 3 to 15 days, and then thawing at a temperature of 20℃ to 25℃, wherein the freezing time of each test test piece is different;

[0013] S6, taking out the test test pieces after freeze-thaw treatment, and testing the test test pieces and the reference test piece for a plurality of performances respectively and comparing them, and recording the changes in the joint part at different freezing times, wherein the changes in the joint part include one or more of the following: change in effective lap width, change in bulging, change in blistering, change in wrinkling, change in warping, change in sliding, change in cracking, and change in peeling;

[0014] S7, repeating the steps of S5 and S6, wherein the freezing temperature of each test test piece can be changed, and the changes in the joint part at different freezing temperatures are tested.

[0015] The application also provides a freeze-thaw cycle testing device for a lap joint of a waterproof roll material, which adopts the following technical scheme:

[0016] A freeze-thaw cycle testing device for a lap joint of a waterproof roll material, comprising:

[0017] A box body, which is provided with a partition plate to divide the cavity of the box body into a water bath box and a freezing box;

[0018] A cover plate, which is arranged above the box body and can move in a direction close to or away from the bottom of the box body;

[0019] A support, which is rotationally connected with the cover plate;

[0020] A clamp, which is used for clamping a test sample and is connected with the support;

[0021] The cover plate is provided with a rotating assembly for driving the support to rotate.

[0022] Further, the rotating assembly comprises:

[0023] A rotating motor, which is fixedly connected with the side of the cover plate away from the box body;

[0024] A rotating gear ring, which is connected with the support;

[0025] A rotating gear, which is coaxially fixedly connected with the output shaft of the rotating motor and is engaged with the rotating gear ring.

[0026] Further, the support comprises:

[0027] The connecting frame is rotatably connected to the cover plate;

[0028] Support frame, used for connection with clamps;

[0029] The support rod is connected to the support frame at one end and to the connecting frame at the other end.

[0030] Furthermore, the support frame includes:

[0031] There are multiple connecting rods, which are arranged sequentially and the ends of adjacent connecting rods are rotatably connected.

[0032] There are multiple connecting rods, which are arranged sequentially and the ends of adjacent connecting rods are rotatably connected. The connecting rods and the connecting rods are of the same length and correspond one-to-one. The connecting rods and the corresponding connecting rods are rotatably connected by a rotating shaft.

[0033] One of the rotating shafts is connected to the support rod, and the other rotating shafts are used to connect to the clamp. The connecting rod is provided with a drive assembly for driving the connecting rod and the connecting rod to rotate.

[0034] Furthermore, the driving component includes:

[0035] The drive rope is connected at one end to a rotating shaft that is connected to a clamp, and at the other end to a partition.

[0036] The drive spring is located between two adjacent rotating shafts, and both ends of the drive spring are connected to the rotating shaft on the corresponding side.

[0037] Furthermore, the support rod is a telescopic rod with a connecting hole. A connecting wheel is rotatably connected to the connecting frame. One end of the drive rope is connected to the partition, and the other end passes around the connecting wheel and through the connecting hole to connect to the rotating shaft.

[0038] Furthermore, an adjusting rod is connected between the pivot shaft connected to the support rod and the adjacent pivot shaft, and the adjusting rod is a telescopic rod.

[0039] In summary, the beneficial technical effects of this application are as follows:

[0040] The freeze-thaw cycle method of this application enables the detection of overlapping seams of waterproof membranes, and at the same time facilitates the inspection of overlapping seams by staff.

[0041] The freeze-thaw cycle device of this application enables workers to complete the freeze-thaw cycle operation of the test sample without manually removing the test sample when inspecting the overlap joint of the waterproof membrane, thereby achieving the purpose of facilitating the operation of the workers. Attached Figure Description

[0042] Figure 1 This is a partial cross-sectional view of an embodiment of this application.

[0043] Figure 2 This is a schematic diagram of the overall structure of the support frame in the embodiments of this application.

[0044] Figure 3 yes Figure 2 An enlarged schematic diagram of part A in the middle.

[0045] Figure 4 This is a schematic diagram of the overall structure of the fixture in the embodiments of this application.

[0046] Reference numerals: 100, cabinet; 110, partition; 111, water bath; 112, freezer; 113, rotating plate; 120, drive hydraulic cylinder; 130, bearing block; 200, cover plate; 300, bracket; 310, connecting frame; 320, support frame; 321, connecting rod; 322, connecting rod; 323, support plate; 324, rotating shaft; 325, connecting block; 330, support rod; 331. Support section; 340, connecting wheel; 400, clamp; 410, clip; 420, U-shaped frame; 421, crossbar; 422, vertical bar; 500, rotating assembly; 510, rotating motor; 520, rotating gear ring; 530, rotating gear; 600, drive assembly; 610, drive rope; 620, drive spring; 700, adjusting rod; 710, connecting part; 720, connecting part; 730, adjusting part. Detailed Implementation

[0047] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0048] This application discloses a freeze-thaw cycle method for waterproof membrane overlap joints, comprising the following steps:

[0049] S1. First, prepare the base layer of the mold with an arc-shaped cross-section;

[0050] S2. Cut two waterproof rolls of appropriate size according to the dimensions of the base layer of the mold;

[0051] S3. Two waterproof membranes are laid on the base layer of the mold using either the loose-lay method or the full-adhesion method. The overlapping edges of the two waterproof membranes are fixedly overlapped at the top of the arc of the base layer of the mold, and the direction of the overlapping edges is parallel to the longitudinal direction of the base layer of the mold.

[0052] S4. Prepare multiple specimens according to steps S1, S2, and S3, one of which is the reference specimen and the rest are test specimens;

[0053] S5. Place the test specimen in the freeze-thaw cycle test chamber, set the temperature and time for freeze-thaw cycle, the freezing temperature is -28℃ to -5℃, the freezing time is 3 to 15 days, and then thaw at a temperature of 20℃ to 25℃. The freezing time is different for each test specimen.

[0054] S6. Take out the test specimens after the freeze-thaw treatment, and conduct multiple performance tests on the test specimens and the reference specimens respectively and compare them. At the same time, record the changes in the joint area during different freezing time treatments. The changes in the joint area include one or more of the following: changes in effective overlap width, bulging, blistering, wrinkling, warping, slippage, cracking, and peeling.

[0055] S7. Repeat steps S5 and S6. The freezing temperature of each test specimen can be changed, and the changes at the joint can be tested under different freezing temperatures.

[0056] Based on the above method, the present invention also discloses a freeze-thaw cycle testing device for waterproof membrane overlap joints. (Refer to...) Figure 1 The aging test device includes a chamber 100, a cover plate 200, a bracket 300, and a clamp 400.

[0057] The side of the cabinet 100 away from the ground is set as an opening, and a partition 110 is fixedly connected inside the cabinet 100 to divide the cavity of the cabinet 100 into a water bath 111 and a freezer 112.

[0058] A cover plate 200 is positioned over the housing 100 and is movable towards or away from the bottom of the housing 100. The housing 100 is equipped with a driving component for moving the cover plate 200. In this embodiment, the driving component is a hydraulic cylinder 120. The cylinder body of the hydraulic cylinder 120 is fixedly connected to the cover plate 200, and the piston rod of the hydraulic cylinder 120, at one end away from the cylinder bottom, passes through the cover plate 200 and is fixedly connected to the partition plate 110. Activating the hydraulic cylinder 120 causes it to move the cover plate 200 towards or away from the housing 100, thereby closing the opening of the housing 100.

[0059] The support frame 300 includes a connecting frame 310, a support frame 320, and a support rod 330. The connecting frame 310 is rotatably connected to the cover plate 200 and is arranged in a ring shape. In this embodiment, four sets of support frames 320 and two support rods 330 are provided, with two sets of support frames 320 corresponding to one support rod 330. The two sets of support rods 330 are positioned opposite each other and are used to connect the support frames 320 and the connecting frame 310. The support frame 320 is used to mount the clamp 400 to support the sample.

[0060] The cover plate 200 is provided with a rotating assembly 500 for driving the connecting frame 310 to rotate. The rotating assembly 500 includes a rotating motor 510, a rotating gear ring 520 and a rotating gear 530. The body of the rotating motor 510 is fixedly connected to the cover plate 200. The output shaft of the rotating motor 510 passes through the cover plate 200 and is coaxially fixedly connected to the rotating gear 530. The rotating gear ring 520 is sleeved on the outside of the piston rod of the driving hydraulic cylinder 120 and is coaxially fixedly connected to the bracket 300. The rotating gear ring 520 meshes with the rotating gear 530.

[0061] Start the rotating motor 510 to drive the rotating gear 530 to rotate, which in turn drives the rotating gear ring 520 to rotate the support 300, thereby adjusting the position of the two sets of support frames 320 to complete the freeze-thaw cycle of the sample.

[0062] Reference Figure 1 and Figure 2 The support rod 330 is a telescopic rod. In this embodiment, the support rod 330 includes multiple support segments 331, which are slidably fitted in sequence to achieve the telescopic extension and retraction of the support rod 330. One end of the support rod 330 is fixedly connected to the connecting frame 310, and the other end is connected to a support plate 323.

[0063] The two sets of support frames 320 and support rods 330 are connected in the same way. This embodiment uses the connection method of one support rod 330 and the corresponding two sets of support frames 320 as an example for explanation. The two sets of support frames 320 are arranged sequentially along the length of the support plate 323, and each set of support frames 320 includes multiple connecting rods 321 and multiple connecting rods 322. The connecting rods 322 and connecting rods 321 are of the same length, and the connecting rods 321 and connecting rods 322 correspond one-to-one. The multiple connecting rods 321 are arranged sequentially, and the ends of adjacent connecting rods 321 are rotatably connected. The multiple connecting rods 322 are arranged sequentially, and the ends of adjacent connecting rods 322 are rotatably connected. A rotating shaft 324 is rotatably connected to the middle position of each of the multiple connecting rods 322, and the rotating shaft 324 is rotatably connected to the middle position of the corresponding connecting rod 321. In this embodiment, the rotating shaft 324 located at the end is fixedly connected to the support plate 323, and the rotating shaft 324 is the first rotating shaft, while the other rotating shafts 324 are the second rotating shafts, which are connected to the clamp.

[0064] In order to enable the extension and retraction of the support rod 330 and the rotation of the connecting rods 322 and the connecting rods 321 of the two sets of support frames 320, a drive assembly 600 for driving the connecting rods 322 and the connecting rods 321 to rotate is provided on the support plate 323.

[0065] Reference Figure 1 and Figure 3A connecting wheel 340 is rotatably connected to the connecting frame 310, and a connecting hole is provided on the support rod 330, through which the connecting hole passes. A rotating plate 113 is rotatably connected to the partition plate 110. The driving assembly 600 includes a driving rope 610 and a driving spring 620. One end of the driving rope 610 is fixedly connected to the rotating plate 113, and the other end passes around the connecting wheel 340 and through the connecting hole before splitting into two strands, each of which is fixedly connected to a second rotating shaft of one of the two sets of support frames 320. The driving spring 620 is located between the two rotating shafts 324, and both ends of the driving spring 620 are connected to the corresponding rotating shaft 324. In this embodiment, the driving spring 620 is located between the first rotating shaft and the adjacent second rotating shaft.

[0066] To facilitate adjustment of the spacing between adjacent samples by staff according to experimental needs, and to prevent the two sets of connecting rods 322 and 321 from swaying left and right, an adjusting rod 700 is provided between the first rotating shaft and the adjacent second rotating shaft. The adjusting rod 700 is a telescopic rod. Specifically, the adjusting rod 700 includes a connecting part 710, a connecting part 720, and an adjusting part 730. The connecting part 720 and the adjusting part 730 are threadedly connected, and the connecting part 720 and the adjusting part 730 are slidably sleeved on the connecting part 710. The connecting part 710 can rotate relative to the connecting part 720 and the adjusting part 730. The cross-section of the connecting part 710 is inverted T-shaped, thus preventing the connecting part 710 from dislodging from the connecting part 720 and the adjusting part 730. The end of the connecting part 710 away from the connecting part 720 is fixedly connected to the first rotating shaft, and the end of the connecting part 720 away from the connecting part 710 is fixedly connected to the second rotating shaft.

[0067] To improve the stability of the support frame 320, a bearing block 130 is fixedly connected to the side walls of the water bath 111 and the freezer 112 that are far apart from each other, and the side of the support frame 320 that is far away from the support plate 323 can be attached to the bearing block 130.

[0068] Connecting blocks 325 are fixedly connected to the second rotating shaft of both sets of support frames 320. The positions of the connecting blocks 325 of the two sets of support frames 320 are set one-to-one, and the corresponding two connecting blocks 325 are provided with through holes.

[0069] Reference Figure 4 The clamp 400 includes a U-shaped frame 420 and clamps 410. The U-shaped frame 420 includes two horizontal bars 421 and one vertical bar 422. The two horizontal bars 421 are located at both ends of the vertical bar 422, and each horizontal bar 421 is fixedly connected to the corresponding side of the vertical bar 422. Two clamps 410 are provided, and each clamp 410 is fixedly connected to one of the horizontal bars 421. The other horizontal bar 421 is inserted into the corresponding through holes on the two connecting parts, thereby realizing the connection between the clamp 400 and the support frame 320.

[0070] The implementation principle of the freeze-thaw cycle test device for the overlap joint of waterproof membrane according to the present application is as follows: the test sample is clamped on the clamp 410, then the clamp 400 is connected to the support frame 320, and finally the drive hydraulic cylinder 120 is controlled so that the drive hydraulic cylinder 120 drives the cover plate 200 to move towards the bottom of the box 100 so that the test sample moves into the freezing box 112 or the water bath box 111.

[0071] After the sample has been frozen or thawed, the tester starts the hydraulic cylinder 120 to move the cover plate 200 away from the bottom of the box 100, and then starts the rotating motor 510 to rotate the bracket 300 180 degrees. The above operation is repeated to thaw or freeze the test sample.

[0072] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A freeze-thaw cycle method for waterproof membrane overlap joints, characterized in that, Includes a cabinet (100) with a partition (110) inside to divide the cavity of the cabinet (100) into a water bath (111) and a freezer (112). A cover plate (200) is placed over the housing (100) and is movable in a direction close to or away from the bottom of the housing (100); The bracket (300) is rotatably connected to the cover plate (200); A clamp (400) is used to hold the test specimen and is connected to the support (300); The cover plate (200) is provided with a rotating assembly (500) for driving the bracket (300) to rotate. The support (300) includes: The connecting bracket (310) is rotatably connected to the cover plate (200); Support frame (320) for connection with clamp (400); The support rod (330) is connected at one end to the support frame (320) and at the other end to the connecting frame (310); The support frame (320) includes: There are multiple connecting rods (321), which are arranged sequentially and the ends of adjacent connecting rods (321) are rotatably connected. There are multiple connecting rods (322), which are arranged sequentially and the ends of adjacent connecting rods (322) are rotatably connected. The connecting rods (322) and the connecting rods (321) have the same length and correspond one to one. The connecting rods (322) and the corresponding connecting rods (321) are rotatably connected through a rotating shaft (324). One of the rotating shafts (324) is connected to the support rod (330), and the other rotating shafts (324) are used to connect to the clamp (400). The connecting rod (321) is provided with a drive assembly (600) for driving the connecting rod (322) and the connecting rod (321) to rotate. The drive component (600) includes: The drive rope (610) is connected at one end to a rotating shaft (324) connected to a clamp (400), and at the other end to a partition (110); The drive spring (620) is located between two adjacent rotating shafts (324), and both ends of the drive spring (620) are connected to the rotating shaft (324) on the corresponding side; It also includes the following steps: S1. First, prepare the base layer of the mold with an arc-shaped cross-section; S2. Cut two waterproof rolls of appropriate size according to the dimensions of the base layer of the mold; S3. Two waterproof membranes are laid on the base layer of the mold using either the loose-lay method or the full-adhesion method. The overlapping edges of the two waterproof membranes are fixedly overlapped at the top of the arc of the base layer of the mold, and the direction of the overlapping edges is parallel to the longitudinal direction of the base layer of the mold. S4. Prepare multiple specimens according to steps S1, S2, and S3, one of which is the reference specimen and the rest are test specimens; S5. Place the test specimen in the freeze-thaw cycle test chamber, set the temperature and time for freeze-thaw cycle, the freezing temperature is -28℃ to -5℃, the freezing time is 3 to 15 days, and then thaw at a temperature of 20℃ to 25℃. The freezing time is different for each test specimen. S6. Take out the test specimens after the freeze-thaw treatment, and conduct multiple performance tests on the test specimens and the reference specimens respectively and compare them. At the same time, record the changes in the joint area during different freezing time treatments. The changes in the joint area include one or more of the following: changes in effective overlap width, bulging, blistering, wrinkling, warping, slippage, cracking, and peeling. S7. Repeat steps S5 and S6. The freezing temperature of each test specimen can be changed, and the changes at the joint can be tested under different freezing temperatures.

2. The freeze-thaw cycle method for waterproof membrane overlap joints according to claim 1, characterized in that, The rotating assembly (500) includes: Rotate the motor (510) and fix it to the side of the cover plate (200) away from the box body (100); Rotate the gear ring (520) to connect it with the bracket (300); The rotating gear (530) is coaxially fixedly connected to the output shaft of the rotating motor (510) and meshes with the rotating gear ring (520).

3. The freeze-thaw cycle method for waterproof membrane overlap joints according to claim 2, characterized in that, The support rod (330) is a telescopic rod. A connecting hole is provided on the support rod (330). A connecting wheel (340) is rotatably connected to the connecting frame (310). One end of the drive rope (610) is connected to the partition plate (110), and the other end passes around the connecting wheel (340) and passes through the connecting hole to connect to the rotating shaft (324).

4. The freeze-thaw cycle method for waterproof membrane overlap joints according to claim 2, characterized in that, An adjusting rod (700) is connected between the rotating shaft (324) connected to the support rod (330) and the adjacent rotating shaft (324). The adjusting rod (700) is a telescopic rod.

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