Freeze-thaw cycle method and test device for lap joint of waterproof coiled material

Abstract

The invention relates to a freeze-thaw cycle method for a waterproof roll lap joint seam and a test device. The freeze-thaw cycle method comprises the following steps: S1, preparing a mold base layer with an arc-shaped cross section; s2, two waterproof coiled materials with proper sizes are cut according to the size of the mold base layer; s3, the two waterproof coiled materials are laid on the mold base layer through an empty laying construction method or a full adhesion construction method, the lap joint edges of the two waterproof coiled materials are fixedly connected to the arc top of the mold base layer in a lap joint mode, and the trend of the lap joint edges is parallel to the longitudinal direction of the mold base layer; s4, a plurality of test pieces are prepared according to the steps S1, S2 and S3, one test piece is a reference test piece, and the other test pieces are test test pieces; s5, putting the test piece into a freeze-thaw cycle testing machine, and setting temperature and time for freeze-thaw cycle; s6, taking out the test piece subjected to freezing and thawing treatment, and respectively carrying out a plurality of performance tests on the test piece and the reference test piece and comparing; according to the method provided by the invention, the detection of the lap seam of the waterproof coiled material is realized.

Description

Technical Field

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

[0002] Waterproof membrane is mainly used in building walls, roofs, tunnels, roads, landfills, etc. It is a flexible building material product that can be rolled into a roll to resist the seepage of external rainwater and groundwater. As a leak-free connection between the project foundation and the building, it is the first barrier to waterproofing the entire project and plays a vital role in the entire project.

[0003] When the roof is constructed in winter, the long-term rain and snow weather in winter will cause the water content of the roof concrete floor to increase dramatically. The concrete strength increases slowly in low temperature environment. The repeated freezing and thawing will cause the concrete surface layer to crack and sand easily, which will easily cause hollowing between the waterproof membrane and the concrete surface layer. Later, under the influence of sunlight and rising temperature, the water in the base layer evaporates and vaporizes to form water vapor, and the asphalt waterproof membrane in the area with insufficient adhesion is swollen and deformed, especially at the overlap joints of the waterproof membrane, which is prone to separation, resulting in damage to the roof waterproofing.

[0004] However, there are few test methods for lap joints in the current product standards for waterproof membranes, and it is impossible to perform standard testing on the freeze-thaw cycle of the lap joints. Based on this, the present application proposes a freeze-thaw cycle method and test device for the lap joints of waterproof membranes. Summary of the invention

[0005] In order to implement freeze-thaw cycle testing of the lap joints of waterproof membranes, the present application provides a freeze-thaw cycle method and a test device for the lap joints of waterproof membranes.

[0006] In the first aspect, the present application proposes a freeze-thaw cycle method for the lap joint of a waterproof membrane, which adopts the following technical solution: A freeze-thaw cycle method for a lap joint of a waterproofing membrane comprises the following steps: S1. Prepare a mold base with an arc-shaped cross section; S2. Cut out two pieces of waterproof membrane of appropriate size according to the size of the mold base; S3. Use the empty laying method or the full sticking method to lay two waterproof membranes on the mold base, wherein the overlapping edges of the two waterproof membranes are fixedly overlapped at the top of the arc of the mold base, and the direction of the overlapping edges is parallel to the longitudinal direction of the mold base; S4, preparing a plurality of specimens according to the steps of S1, S2, and S3, one of which is a reference specimen and the rest are test specimens; S5. Place the test specimen in a freeze-thaw cycle tester, set the temperature and time for freeze-thaw cycles, freeze at -28°C to -5°C, freeze for 3 to 15 days, and then thaw at 20°C to 25°C. The freezing time for each test specimen is different. S6, taking out the test specimens that have completed the freeze-thaw treatment, and testing and comparing the test specimens and the reference specimens for multiple properties, and recording changes in the joints during different freezing time treatments, wherein the changes in the joints include one or more of changes in effective overlap width, bulging, blistering, wrinkling, warping, slipping, cracking, and peeling; S7. Repeat the test of steps S5 and S6 to change the freezing temperature value of each test specimen, and then test the changes in the joint parts under different freezing temperature values.

[0007] The present application also provides a freeze-thaw cycle test device for the lap joint of a waterproof membrane, which adopts the following technical solution: A freeze-thaw cycle test device for a lap joint of a waterproofing membrane, comprising: A box body is provided with a partition to divide the cavity of the box body into a water bath box and a freezer box; A cover plate is arranged on the top of the box body and can move in a direction close to or away from the bottom of the box body; A bracket, rotatably connected to the cover plate; A fixture, used to clamp the test specimen and connected to the bracket; The cover plate is provided with a rotating assembly for driving the bracket to rotate.

[0008] Furthermore, the rotating assembly comprises: The rotating motor is fixedly connected to the side of the cover plate facing away from the box body; Rotate the gear ring to connect with the bracket; The rotating gear is coaxially fixedly connected with the output shaft of the rotating motor and meshes with the rotating ring gear.

[0009] Furthermore, the support comprises: A connecting frame, rotatably connected to the cover plate; A support frame, used for connecting with the clamp; One end of the support rod is connected to the support frame, and the other end is connected to the connecting frame.

[0010] Furthermore, the support frame comprises: A plurality of connecting rods are provided, the plurality of connecting rods are arranged in sequence, and the ends of adjacent connecting rods are rotatably connected; A plurality of connecting rods are provided, and the plurality of connecting rods are arranged in sequence, and the ends of adjacent connecting rods are rotatably connected, the connecting rods and the connecting rods have the same length, and the two correspond one to one, and the connecting rods are rotatably connected with the corresponding connecting rods through a rotating shaft; One of the rotating shafts is connected to the supporting rod, and the other rotating shafts are used to be connected to the clamps. The connecting rod is provided with a driving assembly for driving the connecting rod and the connecting rod to rotate.

[0011] Furthermore, the driving assembly comprises: A driving rope, one end of which is connected to a rotating shaft connected to the clamp, and the other end of which is connected to the partition; The driving spring is located between two adjacent rotating shafts, and both ends of the driving spring are connected to the rotating shafts on the corresponding sides.

[0012] Furthermore, the support rod is a telescopic rod, a connecting hole is opened on the support rod, a connecting wheel is rotatably connected to the connecting frame, one end of the driving rope is connected to the partition, and the other end passes around the connecting wheel and passes through the connecting hole to be connected to the rotating shaft.

[0013] Furthermore, an adjusting rod is connected between the rotating shaft connected to the supporting rod and an adjacent rotating shaft, and the adjusting rod is a telescopic rod.

[0014] In summary, the beneficial technical effects of this application are: The freeze-thaw cycle method of the present application realizes the detection of the lap joints of the waterproof membrane, and at the same time, it is convenient for the staff to detect the lap joints; The freeze-thaw cycle device of the present application enables the staff to complete the freeze-thaw cycle operation of the test sample when testing the lap joints of the waterproof membrane without manually removing the test sample, thereby achieving the purpose of facilitating the operation of the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a partial cross-sectional view of an embodiment of the present application.

[0016] Figure 2 It is a schematic diagram of the overall structure of the support frame in the embodiment of the present application.

[0017] Figure 3 yes Figure 2 Enlarged schematic diagram of part A.

[0018] Figure 4 It is a schematic diagram of the overall structure of the clamp in the embodiment of the present application.

[0019] Reference numerals: 100, box body; 110, partition; 111, water bath; 112, freezer; 113, rotating plate; 120, driving hydraulic cylinder; 130, bearing block; 200, cover plate; 300, bracket; 310, connecting frame; 320, supporting frame; 321, connecting rod; 322, connecting rod; 323, supporting plate; 324, rotating shaft; 325, connecting block; 330, supporting rod; 331, Support section; 340, connecting wheel; 400, clamp; 410, clamp; 420, U-shaped frame; 421, cross bar; 422, vertical bar; 500, rotating assembly; 510, rotating motor; 520, rotating gear ring; 530, rotating gear; 600, driving assembly; 610, driving rope; 620, driving spring; 700, adjusting rod; 710, connecting part; 720, connecting part; 730, adjusting part. DETAILED DESCRIPTION

[0020] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0021] The present application embodiment discloses a freeze-thaw cycle method for a lap joint of a waterproof membrane, comprising the following steps: S1. Prepare a mold base with an arc-shaped cross section; S2. Cut out two pieces of waterproof membrane of appropriate size according to the size of the mold base; S3. Use the empty laying method or the full sticking method to lay two waterproof membranes on the mold base, wherein the overlapping edges of the two waterproof membranes are fixedly overlapped at the top of the arc of the mold base, and the direction of the overlapping edges is parallel to the longitudinal direction of the mold base; S4, preparing a plurality of specimens according to the steps of S1, S2, and S3, one of which is a reference specimen and the rest are test specimens; S5. Place the test specimen in a freeze-thaw cycle tester, set the temperature and time for freeze-thaw cycles, freeze at -28°C to -5°C, freeze for 3 to 15 days, and then thaw at 20°C to 25°C. The freezing time for each test specimen is different. S6, taking out the test specimens that have completed the freeze-thaw treatment, and testing and comparing the test specimens and the reference specimens for multiple properties, and recording changes in the joints during different freezing time treatments, wherein the changes in the joints include one or more of changes in effective overlap width, bulging, blistering, wrinkling, warping, slipping, cracking, and peeling; S7. Repeat the test of steps S5 and S6 to change the freezing temperature value of each test specimen, and then test the changes in the joint parts under different freezing temperature values.

[0022] Based on the above method, the present invention also discloses a freeze-thaw cycle test device for the lap joint of waterproof membrane. Figure 1 The aging test device includes a box body 100 , a cover plate 200 , a bracket 300 and a fixture 400 .

[0023] The side of the box body 100 away from the ground is set to be open, and a partition 110 is fixedly connected inside the box body 100 to divide the cavity of the box body 100 into a water bath box 111 and a freezer box 112.

[0024] The cover plate 200 is disposed on the box body 100 and can move in a direction close to or away from the bottom of the box body 100. A driving member for driving the cover plate 200 to move is provided on the box body 100. In this embodiment, the driving member is a driving hydraulic cylinder 120, the cylinder body of the driving hydraulic cylinder 120 is fixedly connected to the cover plate 200, and the end of the piston rod of the driving hydraulic cylinder 120 away from the cylinder bottom passes through the cover plate 200 and is fixedly connected to the partition 110. The driving hydraulic cylinder 120 is started so that the driving hydraulic cylinder 120 drives the cover plate 200 to move in a direction away from or close to the box body 100, so as to close the opening of the box body 100.

[0025] The bracket 300 includes a connecting frame 310, a supporting frame 320 and a supporting rod 330. The connecting frame 310 is rotatably connected to the cover plate 200, and the connecting frame 310 is arranged in a ring shape. In this embodiment, four groups of supporting frames 320 and two supporting rods 330 are arranged, and two groups of supporting frames 320 correspond to one supporting rod 330. The two groups of supporting rods 330 are arranged in relative positions, and the supporting rods 330 are used to connect the supporting frames 320 and the connecting frame 310. The supporting frame 320 is used to set up the clamp 400 to support the sample.

[0026] 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 ring gear 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 ring gear 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, and the rotating ring gear 520 is meshed with the rotating gear 530.

[0027] The rotating motor 510 is started to drive the rotating gear 530 to rotate, thereby driving the rotating ring gear 520 to rotate the bracket 300, thereby adjusting the positions of the two groups of support frames 320 to complete the freeze-thaw cycle of the sample.

[0028] Reference Figure 1 and Figure 2 The support rod 330 is a telescopic rod. In this embodiment, the support rod 330 includes a plurality of support segments 331, which are slidably sleeved in sequence to achieve the telescopic movement 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.

[0029] The connection method of the two corresponding groups of support frames 320 and support rods 330 is the same. This embodiment is described by taking the connection method of one of the support rods 330 and the corresponding two groups of support frames 320 as an example. The two groups of support frames 320 are arranged in sequence along the length direction of the support plate 323, and the two groups of support frames 320 each include a plurality of connecting rods 321 and a plurality of connecting rods 322, and the connecting rods 322 and the connecting rods 321 have the same length, and the connecting rods 321 and the connecting rods 322 correspond one to one. The plurality of connecting rods 321 are arranged in sequence, and the ends of adjacent connecting rods 321 are rotatably connected, and the plurality of connecting rods 322 are arranged in sequence, and the ends of adjacent connecting rods 322 are rotatably connected. The middle positions of the plurality of connecting rods 322 are all rotatably connected with a rotating shaft 324, 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 supporting plate 323, and the rotating shaft 324 is the first rotating shaft, and the other rotating shafts 324 are the second rotating shafts, and the second rotating shafts are connected to the clamp.

[0030] In order to realize the extension and retraction of the support rod 330 and the rotation of the connecting rod 322 and the connecting rod 321 of the two groups of support frames 320, a driving assembly 600 for driving the connecting rod 322 and the connecting rod 321 to rotate is provided on the support plate 323.

[0031] Reference Figure 1 and Figure 3 , a connecting wheel 340 is rotatably connected to the connecting frame 310, and a connecting hole is provided on the support rod 330, and the connecting hole penetrates the support rod 330. A rotating plate 113 is rotatably connected to the partition 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 of the driving rope 610 is divided into two strands after passing through the connecting wheel 340 and passing through the connecting hole, and the two strands are respectively fixedly connected to a second rotating shaft 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 rotating shaft 324 on the corresponding side. In this embodiment, the driving spring 620 is located between the first rotating shaft and the second rotating shaft adjacent thereto.

[0032] In order to facilitate the staff to adjust the spacing between adjacent samples according to the test needs and make the two sets of connecting rods 322 and connecting rods 321 not easy to swing left and right, an adjustment rod 700 is arranged between the first rotating shaft and the second rotating shaft adjacent thereto, and the adjustment rod 700 is a telescopic rod. Specifically, the adjustment rod 700 includes a connecting portion 710, a connecting portion 720 and an adjusting portion 730, the connecting portion 720 and the adjusting portion 730 are threadedly connected, and the connecting portion 720 and the adjusting portion 730 are slidably sleeved on the connecting portion 710, and the connecting portion 710 can rotate relative to the connecting portion 720 and the adjusting portion 730, and the cross section of the connecting portion 710 is an inverted T-shaped, so that the connecting portion 710 is not easy to escape from the connecting portion 720 and the adjusting portion 730. One end of the connecting portion 710 away from the connecting portion 720 is fixedly connected to the first rotating shaft, and one end of the connecting portion 720 away from the connecting portion 710 is fixedly connected to the second rotating shaft.

[0033] In order to improve the stability of the support frame 320 , the side walls of the water bath 111 and the freezer 112 away from each other are fixedly connected to the bearing block 130 , and the side of the support frame 320 away from the support plate 323 can be overlapped on the bearing block 130 .

[0034] The second rotating shafts of the two groups of support frames 320 are fixedly connected with connecting blocks 325 . The connecting blocks 325 of the two groups of support frames 320 are arranged in a one-to-one corresponding position, and the corresponding two connecting blocks 325 are provided with through holes.

[0035] Reference Figure 4 The clamp 400 includes a U-shaped frame 420 and a clip 410. The U-shaped frame 420 includes two cross bars 421 and a vertical bar 422. The two cross bars 421 are respectively arranged at both ends of the vertical bar 422, and the cross bars 421 are fixedly connected to the corresponding sides of the vertical bar 422. Two clips 410 are provided, and the two clips 410 are fixedly connected to one of the cross bars 421. The other cross bar 421 is plugged with the through holes on the two corresponding connections, so as to realize the connection between the clamp 400 and the support frame 320.

[0036] The implementation principle of the freeze-thaw cycle test device for the lap joint of the waterproof coiled material in the embodiment of the present application is as follows: the test sample is clamped on the clamp 410, and then the clamp 400 is connected to the support frame 320, and finally the driving hydraulic cylinder 120 is controlled to drive the cover plate 200 to move toward the bottom of the box body 100, so that the test sample moves into the freezer 112 or the water bath 111; When the sample is frozen or thawed, the tester starts the driving hydraulic cylinder 120 to move the cover 200 away from the bottom of the box 100, and then starts the rotating motor 510 to rotate the bracket 300 180 degrees, and repeats the above operation to thaw or freeze the test sample.

[0037] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A freeze-thaw cycle method for lap joints of waterproofing membranes, characterized in that: The steps include: S1. Prepare a mold base with an arc-shaped cross section; S2. Cut out two pieces of waterproof membrane of appropriate size according to the size of the mold base; S3. Use the empty laying method or the full sticking method to lay two waterproof membranes on the mold base, wherein the overlapping edges of the two waterproof membranes are fixedly overlapped at the top of the arc of the mold base, and the direction of the overlapping edges is parallel to the longitudinal direction of the mold base; S4, preparing a plurality of specimens according to the steps of S1, S2, and S3, one of which is a reference specimen and the rest are test specimens; S5. Place the test specimen in a freeze-thaw cycle tester, set the temperature and time for freeze-thaw cycles, freeze at -28°C to -5°C, freeze for 3 to 15 days, and then thaw at 20°C to 25°C. The freezing time for each test specimen is different. S6. Take out the test specimens that have completed the freeze-thaw treatment, and perform multiple performance tests on the test specimens and the reference specimens and compare them, and record the changes in the joints during the different freezing time treatments, wherein the changes in the joints include one or more of the changes in effective overlap width, bulging, blistering, wrinkling, warping, slipping, cracking, and peeling; S7. Repeat the test of steps S5 and S6 to change the freezing temperature value of each test specimen, and then test the changes in the joint parts under different freezing temperature values.

2. A freeze-thaw cycle test device for the lap joint of a waterproofing membrane, characterized in that: include: A box body (100) is provided with a partition (110) therein to divide the cavity of the box body (100) into a water bath box (111) and a freezer box (112); A cover plate (200) is disposed above the box body (100) and is capable of moving in a direction approaching or moving away from the bottom of the box body (100); A bracket (300) is rotatably connected to the cover plate (200); A clamp (400) is used to clamp the test specimen and is connected to the bracket (300); The cover plate (200) is provided with a rotating assembly (500) for driving the bracket (300) to rotate.

3. A freeze-thaw cycle test device for lap joints of waterproof membranes according to claim 2, characterized in that: The rotating assembly (500) comprises: A rotating motor (510) is fixedly connected to a side of the cover plate (200) facing away from the box body (100); The rotating ring gear (520) is connected to 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 ring gear (520).

4. A freeze-thaw cycle test device for lap joints of waterproof membranes according to claim 2, characterized in that: The support (300) comprises: A connecting frame (310) rotatably connected to the cover plate (200); A support frame (320) used to be connected to the clamp (400); The support rod (330) has one end connected to the support frame (320) and the other end connected to the connection frame (310).

5. A freeze-thaw cycle test device for lap joints of waterproof membranes according to claim 4, characterized in that: The support frame (320) comprises: A plurality of connecting rods (321) are provided, and the plurality of connecting rods (321) are arranged in sequence, and ends of adjacent connecting rods (321) are rotatably connected; A plurality of connecting rods (322) are provided, the plurality of connecting rods (322) are arranged in sequence, and the ends of adjacent connecting rods (322) are rotatably connected, the connecting rods (322) and the connecting rods (321) are of the same length, and the two correspond one to one, and the connecting rods (322) are rotatably connected to the corresponding connecting rods (321) via a rotating shaft (324); One of the rotating shafts (324) is connected to the support rod (330), and the remaining rotating shafts (324) are used to connect to the clamp (400). The connecting rod (321) is provided with a driving assembly (600) for driving the connecting rod (322) and the connecting rod (321) to rotate.

6. A freeze-thaw cycle test device for lap joints of waterproof membranes according to claim 5, characterized in that: The driving assembly (600) comprises: A driving rope (610), one end of which is connected to a rotating shaft (324) connected to the clamp (400), and the other end of which is connected to the partition (110); The driving spring (620) is located between two adjacent rotating shafts (324), and both ends of the driving spring (620) are connected to the rotating shafts (324) on the corresponding sides.

7. A freeze-thaw cycle test device for lap joints of waterproof membranes according to claim 6, characterized in that: The support rod (330) is a telescopic rod, a connecting hole is formed on the support rod (330), a connecting wheel (340) is rotatably connected to the connecting frame (310), one end of the driving rope (610) is connected to the partition (110), and the other end passes around the connecting wheel (340) and passes through the connecting hole to be connected to the rotating shaft (324).

8. A freeze-thaw cycle test device for lap joints of waterproof membranes according to claim 6, characterized in that: An adjustment rod (700) is connected between the rotating shaft (324) connected to the support rod (330) and an adjacent rotating shaft (324), and the adjustment rod (700) is a telescopic rod.

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