Method for applying a recessed waterstop

Abstract

The application discloses a kind of middle buried type waterstop application methods, including waterstop body and the combination layer being set in the surface of waterstop body two sides, the combination layer is embedded in the waterstop body, the combination layer is bonded with structural concrete, the combination layer is steel mesh layer or non-woven cloth layer or nylon cloth layer, the waterstop is set in construction joint, the waterstop is set below the surface of main structure water-facing surface and is staggered with the reinforcement of building body structure, protective layer arrangement.The application describes a kind of middle buried type waterstop application methods, for the water-proof effect, deformation characteristics and application site of middle buried type waterstop, provide the application technology of new composite waterstop sampling test, process requirement in construction, engineering entity waterproof detection after construction etc., and form specific material inspection standard, perfect new composite waterstop technology, it is conducive to the use of new composite waterstop.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of subway construction, in particular to an application method of a middle-buried water stop belt. BACKGROUND

[0002] Patent document CN 113931235 A "Subway special middle-buried rubber water stop belt" discloses a subway special middle-buried rubber water stop belt, which comprises a planar water stop belt body, the water stop belt body is arranged in a deformation joint, and the two ends of the water stop belt body are embedded in the inside of structural concrete through a concrete pouring process. The part of the water stop belt body embedded in the inside of the structural concrete is provided with a double-sided steel mesh (or a non-woven fabric, a nylon cloth or the like chemical fiber cloth) to form a bonding layer, so that the mesh structure is well bonded with the structural concrete. The water stop belt has high durability, can well cooperate with the deformation of concrete caused by temperature stress through the combination of rubber and steel mesh, prevents the gripping failure of rubber and concrete caused by the deformation difference of rubber and concrete when the temperature changes, prevents the generation of gaps to cause water leakage defects, realizes ideal anti-leakage effect, and solves the water leakage problem of the existing middle-buried water stop belt of the deformation joint of the subway engineering.

[0003] Patent document CN 210117696 U "A composite plastic water stop belt" discloses a new composite water stop belt. The main technical scheme of the water stop belt comprises a plastic water stop belt body and anchor parts arranged on the transverse two sides of the water stop belt body. The upper surface and the lower surface of the belt body of the anchor part are provided with a fiber layer forming an integral structure. The water stop belt has the advantages of simple structure, convenient construction and firm adhesion with the concrete base. Compared with the existing plastic water stop belt, the self-adhesion structure improves the long-term adhesion performance between the self-adhesion structure and the concrete, and there is no need to set a plastic film on the surface. In the construction process, there is no need to consider the problem of adhesion failure caused by construction failure, so that good waterproof and water stop effects are realized, and the problem of construction joint leakage is reduced.

[0004] Under the existing construction environment and construction conditions, the construction joint leakage phenomenon is common, the late leakage repair and maintenance cost is high, the maintenance effect is poor, and the late operation of the subway is greatly affected. Obviously, the two kinds of new water stop belts can effectively improve the leakage problem of the deformation joint and other construction joints.

[0005] However, in the existing actual application, on the one hand, the traditional water stop belt has been accepted by the society after years of application, and the habitual thought and corresponding commercial behavior of people make it difficult for the new water stop belt to smoothly expand the use range. On the other hand, because the new water stop belt lacks clear application technology, the new composite water stop belt cannot be successfully promoted. SUMMARY

[0006] In order to improve the application technology of the new composite water stop belt, it is beneficial to popularize the new composite water stop belt, and finally the leakage problem of the construction joint of the subway construction is improved, the application method of the middle buried water stop belt is described, the water stop effect, deformation characteristics and application occasions of the middle buried water stop belt are provided, the sampling test, process requirement in construction, waterproof detection of engineering entity after construction and other aspects of the application technology of the new composite water stop belt are provided, and the specific material inspection standard is formed, the technology of the new composite water stop belt is improved, and it is beneficial to popularize the use of the new composite water stop belt.

[0007] The technical scheme of the application is as follows:

[0008] The application method of the middle buried water stop belt comprises a water stop belt body and a combination layer arranged on both sides of the water stop belt body, the combination layer is embedded in the water stop belt body, and the combination layer is bonded with the structural concrete through an anchoring agent.

[0009] The anchoring agent is cement mortar. The cement mortar is a common construction material, which is convenient to take and use, and the water stop belt and the structural concrete are connected, and the two are similar, and the connection is good.

[0010] In the cross-sectional direction of the water stop belt, the length of the single combination layer is 80-100mm.

[0011] The combination layer is a steel mesh layer, a non-woven fabric layer or a net-shaped nylon cloth layer.

[0012] In addition to the two materials, other materials that are good for rubber embedding and have a small linear expansion coefficient with concrete can also be used as the material of the combination layer.

[0013] The existence of the combination layer makes the water stop belt body and the concrete firmly connected, the combination layer and the anchoring effect of the cement mortar cooperate to connect, improve the connection strength between the water stop belt and the concrete, reduce the relative deformation amount between the water stop belt body and the concrete, avoid the peeling and deviation phenomenon between the water stop belt and the concrete, and no leakage channel is generated.

[0014] The net structure is not necessarily a necessary factor, and the gripping force between the concrete and the water stop belt can meet the requirements.

[0015] The application method of the middle buried water stop belt sets the water stop belt on both sides of the construction joint to be upwarping and anchored into the structural concrete, so that an included angle is formed between the combination layer and the middle part of the water stop belt body.

[0016] Further, the upwarping angle of the water stop belt is 15°, and the included angle between the combination layer and the middle part of the water stop belt body is 165°.

[0017] The setting of the included angle is conducive to improving the concrete construction quality and ensuring that the grip (contact) between the water stop belt and the concrete has no dead angle, so that the bonding layer can be well embedded in the concrete.

[0018] In the above-mentioned application method of the embedded water stop belt, the bonding layer at the joint to be spliced of the water stop belt is removed to form a first splicing section, the width of the first splicing section is 10 cm, and the water stop belts are connected through the first splicing section.

[0019] Further, when the construction joint is a two-dimensional structure, the first splicing section between the water stop belts is connected by hot melt welding; when the construction joint is a three-dimensional or more structure, the first splicing section between the water stop belts is connected with a connecting end, so that the water stop belts are connected through the connecting end.

[0020] Still further, the connecting end comprises a plurality of connecting heads, the two sides of the connecting head are covered with the bonding layer, the end of the connecting head is provided with a second splicing section, and the first splicing section and the second splicing section are hot melt welded, so that the water stop belt is connected with the connecting end.

[0021] The water stop belt is spliced into a two-layer structure, which can be easily peeled and welded during extension, and there is no more complicated operation compared with the traditional full-rubber water stop belt.

[0022] In the above-mentioned application method of the embedded water stop belt, the water stop belt is arranged in the construction joint, and the water stop belt is arranged below the surface of the water-facing surface of the main structure and is staggered with the reinforcement and the protective layer of the building structure.

[0023] Further, the water stop belt is arranged at a position 100 mm below the surface of the water-facing surface of the main structure.

[0024] The water stop belt of the prior art is arranged at the middle position in the vertical direction of the construction joint, and from the force angle and the interception water angle, the water stop belt arranged at the middle position is in average stress and has high structural balance. However, in the present application, the arrangement position of the water stop belt is only referred to the water-facing surface of the underground building, and the purpose is to avoid the reinforcement and the protective layer of other structures. The water-facing surface close to the main structure facilitates heat dissipation, and the heat dissipation efficiency is relatively high. During the concrete solidification process, the heat dissipation speed between the water stop belt and the structural concrete is relatively fast, and the maximum temperature rise of the local structural concrete is inhibited. Since there is still a large difference between the thermal expansion coefficients of the water stop belt and the structural concrete, the inhibition of temperature change can reduce the difference between the expansion / shrinkage amounts of the two, thereby reducing the possibility of peeling and deviation of the water stop belt and the concrete.

[0025] In the above-mentioned application method of the embedded water stop belt, the test method of the water stop belt is as follows:

[0026] A plurality of test samples of waterstops are made or obtained, the waterstops are cast in concrete to form concrete test pieces, and the formed concrete test pieces are cured, when the concrete test pieces are finally cured and reach a certain strength, respectively, a peeling test and a tensile fracture test are carried out, and test data are recorded.

[0027] Since the waterstop is a multi-layer structure, the connection includes the connection of the waterstop body and the bonding layer, and the connection between the waterstop and the structural concrete, and any problem in the connection will cause insufficient gripping force between the waterstop and the concrete, and the relative position of the waterstop and the structural concrete will be offset, so the test of the new composite waterstop needs to include the test of the above two connection parts, the peeling test corresponds to the connection of the waterstop body and the bonding layer, and the tensile fracture test corresponds to the connection of the waterstop and the concrete.

[0028] Further, in the peeling test, the concrete test piece includes the waterstop and the concrete block, the waterstop is embedded inside the concrete block through the bonding layer, the concrete test piece is placed on a tensile testing machine, one clamping part of the tensile testing machine clamps one end of the concrete block, and the other clamping part clamps the end of the bonding layer at the other end and moves outward, so that the bonding layer is separated from the concrete block, the force value data of the tensile testing machine during the process are recorded, and the peeling strength is calculated.

[0029] Further, the condition for the waterstop test to be qualified is that the peeling strength is greater than or equal to 5 N / mm 2 .

[0030] Further, the bonding layer moves at a speed of (100±10) mm / min.

[0031] Further, the length of the bonding layer separated from the concrete block is at least 125 mm.

[0032] Further, the force value data are recorded when the length of the bonding layer separated from the concrete block is greater than 25 mm.

[0033] Further, in the tensile fracture test, the concrete test piece includes two concrete blocks at both ends and the waterstop in the middle, the waterstop is inserted into the concrete blocks at both ends, the waterstop at both ends extends from the upper surface of the concrete block, one of the concrete blocks is placed in an ambient temperature, the other concrete block is placed in a variable temperature environment, and then the one concrete block is placed in one clamping part of a tensile testing machine, and the other clamping part of the tensile testing machine clamps the other concrete block and moves along the axial direction of the concrete test piece until

[0034] (1) the waterstop band breaks, or

[0035] (2) the waterstop band is pulled out of the concrete block, or

[0036] (3) the elongation of the waterstop band reaches 400%,

[0037] The force value data of the tensile testing machine during the recording process.

[0038] Further, the moving speed of the other clamping part of the tensile testing machine is 50±5 N / mm.

[0039] Further, the initial temperature of the variable temperature environment is higher than the ambient temperature, and after the other concrete block of the concrete test piece reaches the final setting stage, the variable temperature environment is placed in the variable temperature environment, the variable temperature environment is heated at a variable temperature rate of 5℃ / h until the temperature of the variable temperature environment is higher than the ambient temperature by 30℃, and after a certain period of time, the variable temperature environment is cooled to the ambient temperature at a variable temperature rate of-5℃ / h and maintained for a certain period of time.

[0040] After the initial setting of the concrete, the concrete has a certain strength, and a relatively stable gripping relationship exists between the concrete and the waterstop band, and they are in a relatively static state. However, when the structural concrete is in the final setting state, the heat generated by the hydration reaction inside the structural concrete needs to be released, and the external environmental temperature of the structural concrete changes constantly. The internal and external factors act on the structural concrete, increasing the temperature stress and shrinkage stress inside the structural concrete. If the relatively stable gripping force between the concrete and the waterstop band in the initial setting state cannot constrain the increased temperature stress and shrinkage stress, the position between the waterstop band and the concrete will still shift, forming a water seepage channel. The new composite waterstop band is externally provided with a bonding layer for anchoring with the concrete. The gripping force between the bonding layer and the concrete needs to be greater than the tensile force caused by the temperature stress and shrinkage stress of the concrete in the final setting state. Therefore, the anchoring performance test between the waterstop band and the concrete needs to be increased in the qualification test of the waterstop band product or the temporary test on site to determine whether the waterstop band can meet the requirements of resisting temperature stress and shrinkage stress.

[0041] In addition, the structure concrete after final setting will still be affected by the temperature difference between day and night and annual temperature difference, and the subsequent gradually released shrinkage stress still has a great influence on the deformation of the structure concrete. At this time, the gripping force between the concrete and the waterstop has basically stabilized. If the gripping force cannot resist the tensile force caused by the deformation of the structure concrete, the phase position between the concrete and the waterstop may still deviate, forming a leakage water channel that cannot be identified by the naked eye. Therefore, the state of the gripping force between the concrete and the waterstop after the final setting of the concrete is an important factor for evaluating the performance of the waterstop. Since the position deviation of the waterstop is mainly caused by the temperature change process of the hydration heat of the concrete, the linear expansion coefficients of the waterstop and the concrete are different, the gripping force between the waterstop and the concrete is less than the temperature stress and shrinkage stress generated by the concrete, and therefore the temperature parameter used for evaluating the performance of the waterstop should take the maximum temperature rise value of the structure concrete. The average of the maximum temperature rise value can be used in general tests. In the specific construction process, the maximum temperature rise value of the concrete of the construction project can be directly used for the pre-test of the waterstop.

[0042] Further, another concrete block of the concrete test piece is placed in a water tank, a hot water and a temperature sensor are placed in the water tank, the water tank is connected with a heater and a cooler, the heater is connected with the cooler through a control terminal, and the control terminal is connected with the temperature sensor.

[0043] The heater and the cooler act on the water tank at the same time, so as to control the water temperature in the water tank, change the temperature of the environment where the concrete test piece placed in the water is located, and place a temperature sensor for monitoring the water temperature in real time in the water tank. The temperature sensor converts the real-time temperature in the water tank into an electric signal and sends it to the control terminal. The control terminal forms a control command according to the current test requirement and the real-time temperature, and controls the working state of the heater and the cooler respectively, so as to adjust the water temperature in the water tank and ensure that the variable temperature environment of the concrete test piece meets the test requirement. The control terminal controls the working state (i.e. output power) of different devices according to the real-time temperature. This control mode can be realized through a pre-programmed single-chip microcomputer program, which is all prior art and will not be described in detail.

[0044] The above-mentioned application method of the embedded waterstop, after the structure concrete is finally set, the temperature of the structure concrete within a range of 500 mm around the waterstop is lowered, so that the temperature of the structure concrete is the same as that of the environment.

[0045] After the concrete is poured and the final setting is completed, although most of the hydration heat has been released during the final setting stage, the concrete still undergoes hydration heat effect and continuously releases heat to the outside with the change of time. At this time, the concrete pouring body structure, especially the mass structure concrete body, will still be affected by the temperature stress and shrinkage stress due to the temperature difference between the heat formed by the internal hydration heat and the external environment, causing the misalignment and deviation between the water stop belt and the water stop belt, and also affecting the bonding force between the newly formed water stop belt and the concrete. Therefore, in order to fully utilize the anchoring advantages of the new composite water stop belt, it is necessary to reduce the hydration heat of the concrete pouring body as much as possible after the final setting is completed, improve the anchoring effect of the bonding layer, and after the final setting of the concrete is completed, cooling (such as pouring cold water) is carried out around the water stop belt, so that the temperature of the concrete pouring body around the water stop belt is close to the ambient temperature, the temperature change caused by the hydration heat effect is reduced or kept to a minimum, so that the expansion and shrinkage difference between the concrete and the water stop belt is changed as little as possible, the anchoring capacity of the bonding layer is fully utilized, and the bonding force between the water stop belt and the concrete is improved.

[0046] The above-mentioned application method of a middle-buried water stop belt includes a platform structure including a table-shaped structure with a construction joint in the middle and a layer panel, the water stop belt is arranged in the construction joint, and both sides of the table-shaped structure are the layer panel. When pouring the concrete of the layer panel,

[0047] Step S1. The water stop belt is arranged in the corresponding position inside the construction joint in advance;

[0048] Step S2. Pouring the concrete of one side of the layer panel to form a table-shaped structure,

[0049] Step S3. After the waterstop is bonded with the concrete of the platform structure, the concrete of the other side of the deck slab is poured. In this way, the installation of the embedded waterstop is completed. In the construction of a super large platform, the distance between the construction joints is large, and in the case of large daily temperature changes, the adhesion between the just-poured concrete and the waterstop has not yet been formed. The daily maximum and minimum temperatures affect the linear expansion coefficient between the concrete and the waterstop, resulting in a large deformation and easy deviation, which can cause a gap. At the same time, the temperature factor not only affects the concrete pouring body on both sides of the construction joint directly connected with the waterstop, but also affects the large-area structural concrete of the deck slab indirectly connected with the waterstop. The deformation of the deck slab structure caused by the large daily temperature change is also large, which directly exerts a force on the structural concrete on both sides of the construction joint. If the adhesion between the waterstop and the concrete has not been formed, and the waterstop does not have a certain tensile strength and stretch resistance, it is still possible for the waterstop to deviate from the structural concrete on both sides of the construction joint during the solidification process of the large-area deck slab structural concrete, resulting in a water seepage path. Therefore, the concrete pouring sequence on both sides of the platform construction joint should be opposite to the prior art, i.e., the waterstop and the structural concrete on both sides of the construction joint are poured first, and then the large-area deck slab on both sides is poured after a period of curing. The width of the waterstop and the structural concrete on both sides of the construction joint can be designed according to the overall structure, and the adhesion between the waterstop and the concrete should not be too large to avoid affecting the adhesion.

[0050] According to the above-mentioned scheme, the application has the advantages that

[0051] 1. The combination layer provided on both sides of the waterstop can improve the adhesion between the waterstop and the concrete. Compared with the single-layer structure / single-material waterstop of the prior art, the increased anchoring capacity between the waterstop and the concrete enables the waterstop to adapt to more complex construction environments and effectively prevent water leakage at the construction joint, making the operation of the underground project more smooth.

[0052] 2. During the construction of the construction joint and the subway platform, the original construction procedure is changed, and the construction of the deck structure is performed after the anchoring relationship between the waterstop and the structural concrete on both sides of the construction joint is stabilized. This can effectively prevent the deformation of the large-area platform structural concrete caused by the environmental temperature and the internal hydration heat from affecting the positional relationship between the waterstop and the construction joint, thereby preventing the formation of a water seepage path.

[0053] 3. When the structural concrete is setting with construction joints and water stop, the temperature of the water stop is reduced, the temperature difference between the concrete and the external environment is reduced, the deformation of the structural concrete is reduced, the possibility of the water stop deviating from the structural concrete before forming a stronger gripping force with the structural concrete is reduced, and no water leakage channel is formed.

[0054] 4. A standardized new type of composite water stop is provided, and a qualified test method is provided. The connection strength between the water stop body and the bonding layer, and the connection strength between the water stop and the concrete are tested, and the influence of temperature changes is additionally considered. A product qualified test independent of construction process and site conditions is designed, which can be used for sampling inspection and temporary testing on site. BRIEF DESCRIPTION OF DRAWINGS

[0055] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0056] Figure 1 It is a schematic diagram of the planar structure of the water stop of the present application.

[0057] Figure 2 It is a schematic diagram of the cross-sectional structure of the water stop of the present application.

[0058] Figure 3 It is a schematic diagram of the structure of the water stop embedded in the structural concrete.

[0059] Figure 4 It is a schematic diagram of the structure of the connecting end of the three-dimensional structure.

[0060] Figure 5 It is a schematic diagram of the structure of the platform structure.

[0061] In the drawings, various reference signs represent:

[0062] 1. Water stop body; 2. Bonding layer; 3. Connecting end; 31. Connecting head; 4. Structural concrete; 5. Table structure; 6. Layer panel; 7. Construction joint. DETAILED DESCRIPTION

[0063] In order to make the technical problems to be solved by the present application, the technical solutions and beneficial effects more clear and explicit, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0064] Embodiment one:

[0065] As shown in Figure 1 , Figure 2 , the waterstop includes a waterstop body 1 and a binding layer 2, the binding layer 2 is anchored into the waterstop body 1, the binding layer 2 is arranged on both sides of the waterstop, the material of the waterstop body 1 is rubber, the material of the binding layer 2 is steel, the structure of the binding layer 2 is a mesh structure, and the length of the binding layer 2 on one side is 80 mm from the cross section of the waterstop.

[0066] Example Two:

[0067] As shown in Figure 1 , Figure 2 , the waterstop includes a waterstop body 1 and a binding layer 2, the binding layer 2 is anchored into the waterstop body 1, the binding layer 2 is arranged on both sides of the waterstop, the material of the waterstop body 1 is rubber, the material of the binding layer 2 is nylon cloth, the structure of the binding layer 2 is a mesh structure, and the length of the binding layer 2 on one side is 90 mm from the cross section of the waterstop.

[0068] Example Three:

[0069] As shown in Figure 1 , Figure 2 , the waterstop includes a waterstop body 1 and a binding layer 2, the binding layer 2 is anchored into the waterstop body 1, the binding layer 2 is arranged on both sides of the waterstop, the material of the waterstop body 1 is rubber, the material of the binding layer 2 is non-woven fabric, the structure of the binding layer 2 is a mesh structure, and the length of the binding layer 2 on one side is 100 mm from the cross section of the waterstop.

[0070] Example Four:

[0071] As shown in Figure 3 , the waterstop is placed in the construction joint and below the water-facing surface, the waterstop is arranged to be upturned on both sides of the construction joint, the middle part is 100 mm away from the water-facing surface, the two sides are anchored into the structural concrete 4, so that the part of the waterstop with the binding layer 2 is all anchored into the structural concrete 4, the included angle between the anchored part and the middle horizontal part is 165°, and the part of the waterstop binding layer 2 is upturned by 15°.

[0072] Example Five:

[0073] Two waterstops are placed side by side along the length direction, the binding layer 2 at the connection is removed, the length of the removed part is 100 mm, and then the two waterstops are connected to form a longer waterstop through plane hot melting welding.

[0074] Example Six:

[0075] Prepare the connection end head 3 connected to the three-dimensional structure, as shown in Figure 4As shown, the connecting end 3 includes three connecting heads 31, each with an edge covered by a bonding layer 2, leaving the center open. The main material of the connecting end 3 is rubber, and the bonding layer 2 is made of the same material as the waterstop. The three waterstops are placed side-by-side with the connecting heads 31 and aligned. The bonding layers 2 on both sides of the connection between the waterstop and the connecting head 31 are removed, with a removal length of 10 cm. Then, the connecting end 3 is connected to the three waterstops by planar hot-melt welding.

[0076] Example 7:

[0077] The waterstop is set inside the construction joint. Concrete is poured to form structural concrete 4 on both sides of the construction joint. After the structural concrete 4 has been cured until it has reached its final set, cold water is poured onto the structural concrete 4 on the construction plane within a radius of 500 mm centered on the waterstop to continuously reduce the temperature of the structural concrete 4, so that the temperature of the structural concrete 4 is the same as or close to the ambient temperature.

[0078] Example 8:

[0079] like Figure 5 As shown, the platform structure includes a platform-shaped structure 5 and layer panels 6. The platform-shaped structure 5 has a construction joint 7 in the middle, with a waterstop installed inside the construction joint 7. The layer panels 6 are large-area planar structures on both sides of the platform-shaped structure 5. During casting, the L-shaped platform-shaped structure 5 is cast first, with the waterstop placed inside the construction joint 7. After curing for 7 days, once the waterstop has anchored to the concrete of the platform-shaped structure 5 and formed a more stable bond, the layer panels 6 are then cast layer by layer to form the final structure.

[0080] Example 9:

[0081] A waterstop is obtained, and the bonding layer 2 on the waterstop is made of non-woven fabric.

[0082] The cement mortar mix ratio for the concrete specimens was: ordinary Portland cement of strength grade 42.5: medium sand: water = 1:2:0.4.

[0083] Place the waterstop at the bottom of the test mold, with its surface flush with the mortar surface. Pour in the cement mortar mixture prepared according to the above mix proportions, vibrate to compact, invert to form the mold, and cure in a standard curing environment for 7 days to form a concrete specimen.

[0084] Prepare the tensile testing machine, the range of the tensile testing machine is greater than or equal to 500N, the environmental temperature is controlled at (23±2)℃, and the relative humidity is 45%-65%. One clamping part of the tensile testing machine clamps one end of the concrete test piece, the other clamping part clamps the end of the bonding layer 2 of the other end of the concrete test piece, and then moves away from the concrete test piece at a speed of (100±10)mm / min to separate the bonding layer 2 from the concrete test block. The peeling length, i.e. the displacement length, is greater than or equal to 125mm, and the force value data measured by the tensile testing machine in this process is recorded. The force value data of the peeling length less than or equal to 25mm (i.e. the displacement length less than or equal to 25mm) is not referenced, and the peeling strength is calculated according to the force value data.

[0085] The peeling strength formula is: σT=F / B,

[0086] Wherein, σT is the peeling strength, the unit is Newton per millimeter (N / mm); F is the peeling force, i.e. the measured force value data, the unit is Newton (N); B is the width of the concrete test piece, the unit is millimeter (mm).

[0087] The peeling strength is calculated. If the peeling strength is greater than or equal to 5N / mm 2 , the waterstop tape is qualified or meets the requirements.

[0088] When sampling investigation is performed on multiple samples in the same batch, the arithmetic mean of the peeling strength of all samples can also be calculated as the peeling strength of the batch.

[0089] Example Ten:

[0090] Obtain the waterstop tape, and the bonding layer 2 material on the waterstop tape is non-woven fabric.

[0091] The cement mortar mix ratio of the concrete test piece is: ordinary portland cement with strength grade 42.5: medium sand: water = 1:2:0.4.

[0092] Pour the cement mortar mixture prepared according to the above mix ratio into the mold, tamp and compact, scrape the surface flat, and press the grout. Before initial setting, insert the two ends of the waterstop tape into two concrete blocks respectively, with an insertion depth of 100mm, and place all the bonding layers 2 inside the concrete test piece. Scrape the mortar flat and cure in a standard curing environment for 7 days to form the concrete test piece.

[0093] After the concrete test piece completes final setting, one of the concrete test pieces is placed in a conventional environment for curing, and the other concrete test piece is placed in a water tank containing hot water for curing, so that the concrete test piece is soaked in hot water. At this time, the temperature of the hot water is higher than that of the environment. A temperature sensor is placed in the water tank, and a heater and a cooler are provided. The heater and the cooler are connected to a control terminal, and the control terminal is connected to the temperature sensor. The temperature change in the water tank is controlled through the control terminal.

[0094] After the concrete test piece is placed, the temperature in the water tank is raised at a temperature change rate of 5 ℃ / h through the control terminal, only the temperature in the water tank is raised to 30 degrees Celsius higher than the conventional environment temperature, and is kept stable for 3 hours, then the temperature in the water tank is reduced at a temperature change rate of -5 ℃ / h to the conventional environment temperature, and is cured for 7 days.

[0095] The concrete test piece is taken out, a tensile testing machine is prepared, the range of the tensile testing machine is greater than or equal to 500N, the environment temperature is controlled at (23±2) ℃, and the relative humidity is 45%-65%. One clamping part of the tensile testing machine clamps one concrete block, another clamping part clamps another concrete block, then the concrete blocks are stretched at a rate of 50±5 N / mm along the length direction of the water stop belt (the axis direction of the concrete blocks), until the water stop belt is broken or the water stop belt is separated from the concrete blocks or the stretching rate of the water stop belt has reached 400%, the stretching is stopped. The force value data in the process is recorded.

[0096] The above only describes the preferred embodiments of the present application and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method of applying a recessed waterstop, characterized by, The waterstop includes a waterstop body and a bonding layer arranged on both sides of the waterstop body, the bonding layer is embedded in the waterstop body, and the bonding layer is bonded to the structural concrete by an anchoring agent; The waterstop is arranged in the construction joint, and the waterstop is arranged below the surface of the water-facing surface of the main structure and is staggered with the reinforcement and the protective layer of the building structure. The test method of the waterstop comprises the following steps: A plurality of test samples of the waterstop are prepared or obtained, the waterstop is mixed with concrete to form a concrete test piece, and the formed concrete test piece is cured, after the concrete test piece is finally cured, a peeling test and a tensile fracture test are respectively performed, and test data is recorded; In the peeling test, the concrete test piece includes the waterstop and a concrete block, the waterstop is embedded in the concrete block through the bonding layer, the concrete test piece is placed on a tensile testing machine, one clamping part of the tensile testing machine clamps one end of the concrete block, the other clamping part clamps the end of the bonding layer at the other end and moves outward, so that the bonding layer is separated from the concrete block, force value data of the tensile testing machine during the process is recorded, and a peeling strength is calculated; In the tensile fracture test, the concrete test piece includes two concrete blocks at both ends and the waterstop in the middle, the waterstop is inserted into the concrete blocks at both ends, the waterstop extends from the upper surface of the concrete blocks at both ends, one of the concrete blocks is placed in an ambient temperature, the other concrete block is placed in a variable temperature environment, and then the one concrete block is placed in one clamping part of a tensile testing machine, the other clamping part of the tensile testing machine clamps the other concrete block and moves along the axial direction of the concrete test piece, and force value data of the tensile testing machine during the process is recorded; The initial temperature of the variable temperature environment is higher than the ambient temperature, after the other concrete block of the concrete test piece is placed in the variable temperature environment after the final curing stage, the variable temperature environment is heated at a variable temperature rate of 5 ℃ / h until the temperature of the variable temperature environment is 30 ℃ higher than the ambient temperature, and then the variable temperature environment is cooled at a variable temperature rate of -5 ℃ / h to the ambient temperature after a certain period of time.

2. The method of installing a recessed waterstop as claimed in claim 1, wherein, The waterstop is arranged on both sides of the construction joint and is anchored into the structural concrete, so that an included angle is formed between the bonding layer and the middle part of the waterstop body.

3. The method of installing a recessed waterstop as defined in claim 1, wherein, The bonding layer at the splicing position of the waterstop is removed to form a first splicing section, the width of the first splicing section is 10 cm, and the waterstop is connected through the first splicing section.

4. The method of installing a recessed waterstop as defined in claim 1, wherein, The conditions for stopping the movement of the clamping part are as follows: (1) the waterstop is broken, or (2) the waterstop is separated from the concrete block, or (3) the elongation rate of the waterstop reaches 400%.

5. The method of installing a recessed waterstop as defined in claim 1, wherein, The other concrete block of the concrete test piece is placed in a water tank, hot water and a temperature sensor are arranged in the water tank, the water tank is connected with a heater and a cooler, the heater and the cooler are connected with a control terminal, and the control terminal is connected with the temperature sensor.

6. The method of installing a recessed waterstop as defined in claim 1, wherein, After the structural concrete is finally cured, the structural concrete within a 500mm range around the waterstop is cooled to the same temperature as the ambient temperature.

7. The method of installing a recessed waterstop as defined in claim 1, wherein, The main structure comprises a platform structure, the platform structure comprises a table-shaped structure with a middle part being the construction joint and a layer panel, the waterstop is arranged in the construction joint, and two sides of the table-shaped structure are the layer panel. Step S1: The waterstop is arranged in the corresponding position in the construction joint in advance. Step S2: The concrete on one side of the layer panel is poured to form the table-shaped structure. Step S3: After the waterstop is bonded with the concrete of the table-shaped structure, the concrete of the other side of the layer panel is poured.

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