A precast box culvert waterstop fixing device and construction method

Abstract

This invention provides a precast box culvert waterstop fixing device and construction method for fixing the waterstop to the end of a precast box culvert to be poured. The waterstop fixing device includes: an end template, clamps, and a fixing bracket. The end template is composed of multiple structured template units, and its overall outline conforms to the end face outline of the precast box culvert. The end template has an inwardly recessed mounting groove, which is located at the center of the end template at any cross-section along its extension path. The clamp is composed of multiple structured clamp units, covering the entire extension path of the mounting groove. The clamp is installed facing each other within the mounting groove to fix the waterstop, and a nut is welded to the side of the clamp closest to the center of the mounting groove. The fixing bracket is used to fix the end template to the end of the precast box culvert to be poured. This invention saves construction costs, has high construction and turnover efficiency, and produces good construction quality.

Description

Technical Field

[0001] This invention relates to the technical field, specifically to a precast box culvert waterstop fixing device and construction method. Background Technology

[0002] With the continuous advancement of urbanization and the development of public infrastructure, large precast box culverts, as an important water conservancy project and transportation hub structure, are widely used in underground and subsea engineering construction. In the construction of precast box culverts, pre-embedded waterstops are typically used, usually located at the connection ports and around the openings of one side of the culvert, serving to prevent water leakage and ensure structural stability. Especially in the underwater installation and connection of large precast box culverts, the waterstop, as a crucial component, plays a key role in ensuring the sealing and stability of the box culvert structure, effectively isolating water flow, and preventing seepage and sand leakage. Therefore, before the precast box culvert pouring construction, the installation and fixing of the waterstop using advanced technical means, and the correctness and effectiveness of its pre-embedding method, are of paramount importance for the normal use of subsequent underwater installations of adjacent precast box culverts and the long-term safety of the structure. Selecting the correct waterstop installation method and device is crucial to ensuring the box culvert's performance during precasting and underwater installation and connection.

[0003] In existing technologies, there are several methods for installing and fixing precast box culvert waterstops: Method 1: Wire fixing, which involves passing a steel wire through the waterstop and fixing it to the reinforcing steel frame; Method 2: Bolt fixing, which involves pre-fixing bolts to the reinforcing steel frame and then fixing the waterstop by drilling holes; Method 3: Reinforcing steel frame fixing, which involves using reinforcing steel to create two layers of "clamps" to clamp the waterstop and then indirectly fixing the waterstop by fixing the reinforcing steel frame; Method 4: Self-adhesive fixing, which involves setting a thin steel plate around the waterstop installation location and fixing it to the reinforcing steel frame, then pre-applying adhesive to one side of the waterstop and directly attaching it to the wall of the steel plate during construction.

[0004] The above construction techniques have the following disadvantages:

[0005] For Method 1 and Method 2: (1) Damage to the waterstop, the method of fixing by perforation destroys the integrity of the waterstop and the waterproofing effect is poor; (2) Not suitable for special structures, the fixing may not be stable enough, and it may loosen when pouring concrete, and it is not suitable for large precast box culvert structures; (3) The fixing effect is limited, and long-term exposure may cause loosening or corrosion, requiring regular maintenance and inspection, which increases maintenance costs.

[0006] For method three: (1) The construction is complicated. The production and installation process of the rebar limit frame is relatively complicated. It requires precise measurement and processing, which increases the difficulty of construction; (2) It affects the sealing performance of the waterstop. When the rebar limit frame is fixed, the surface of the rebar and the waterstop may be rubbed or pressured, which will damage the surface of the waterstop and thus affect its sealing performance; (3) The cost is high. The production and installation of the rebar limit frame requires additional materials and labor. At the same time, it is necessary to remove rust regularly, which increases the construction cost.

[0007] For method four: (1) Unstable adhesion. The adhesion of self-adhesive waterstop is affected by the environment and temperature. The adhesive may lose its adhesion in high temperature or humid environment, causing the waterstop to fall off or loosen; (2) High construction requirements. The installation of self-adhesive waterstop requires the surface to be flat and clean to ensure that the waterstop is firmly attached; (3) Difficult to disassemble and replace. Once the self-adhesive waterstop is attached to the steel plate, it is difficult to disassemble and replace, which may require damage to part of the waterstop structure; (4) Susceptible to external pollution. There may be dust, dirt and other pollutants at the construction site, which may affect the adhesion and sealing performance of the self-adhesive waterstop.

[0008] In summary, existing technologies suffer from problems such as high installation and fixing costs, low construction efficiency, and poor construction quality for precast box culvert waterstops. Summary of the Invention

[0009] This invention provides a fixing device and construction method for precast box culvert waterstops, which solves the problems of high installation and fixing costs, low construction efficiency and poor construction quality of precast box culvert waterstops in the prior art.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] A precast box culvert waterstop fixing device is used to fix the waterstop at the end of the precast box culvert to be poured, characterized in that it includes: an end template, a clamp and a fixing bracket.

[0012] The end template is composed of multiple structured template units spliced ​​together, and the overall outline of the end template fits the end face outline shape of the precast box culvert.

[0013] The end template is provided with an inwardly recessed mounting groove, and at any cross-section along the extension path of the end template, the mounting groove is located in the middle of the end template.

[0014] The clamp is assembled from multiple structured clamp units. The clamp can cover the entire extension path of the mounting groove. The clamp can be installed facing each other in the mounting groove and fix the waterstop. A nut is welded to the side of the clamp near the center of the mounting groove.

[0015] The fixing bracket is used to fix the end template at the end of the precast box culvert to be poured.

[0016] Further, the end template unit includes top and bottom end templates and side end templates;

[0017] The top and bottom end templates are vertical and are used to form the top and bottom edges of the end template;

[0018] The middle part of the side end template is vertical, and both ends of the side end template are bent 90 degrees in the same direction, and the side end templates form the two side edges of the end template.

[0019] Further, the precast box culvert is a double-hole box culvert, and the end face of the precast box culvert is in the shape of a horizontally placed Chinese character 'Ri';

[0020] The end template unit further includes a middle partition end template, both ends of the middle partition end template are respectively connected to the middle parts of the top and bottom end templates of the top and bottom edges, and skirt plates are provided on both sides of each end of the middle partition end template.

[0021] Further, the fixture unit includes a linear fixture unit and an arc fixture unit with the same cross-sectional shape. The top of the cross-sectional shape of the fixture unit is in a curved tooth shape, and the nut is welded to the lower part of the cross-sectional shape of the fixture unit;

[0022] The bending direction of the top of the cross-sectional shape of the fixture unit faces the center of the installation groove;

[0023] The linear fixture unit is used to be installed on the linear extension part of the installation groove, and the arc fixture unit is used to be installed on the arc extension part of the installation groove.

[0024] Further, the fixture unit is fixed by inserting a spring bolt into the nut on the side of the end template.

[0025] Further, the fixing bracket is arranged on the side of the end template背离 the installation groove. The middle part of the fixing bracket can insert an adjusting screw rod, and the top of the adjusting screw rod is rotationally connected to the bottom of the end template through a pin shaft;

[0026] Both ends of the fixing bracket are bolted to the outer template. The outer template is located between the end template and the fixing bracket, and the outer template is used to support the pouring surface of the precast box culvert to be poured.

[0027] A construction method for fixedly installing a water stop belt at the end of a precast box culvert to be poured, and the construction method needs to utilize the aforementioned precast box culvert water stop belt fixing device;

[0028] It should be noted that there is an unclear expression '背离' in the original text. I translated it as '背离' according to the literal meaning. You may need to check and correct it according to the actual situation.The construction method includes, in sequence: end formwork assembly, waterstop splicing, waterstop positioning and installation, waterstop clamping and fixing, end formwork overall installation, concrete pouring, end formwork removal and clamp removal.

[0029] The specific steps for splicing the waterstop are as follows: after the waterstop is cut and connected, the connection position after the waterstop is cut is ground and cleaned with an electric grinder, then strong adhesive is evenly applied to the bonding surface, and finally the waterstops at the joint are bonded together, the gap is squeezed out, and the bonding joint is pressed with a pre-compression device to make it bonded firmly.

[0030] After the waterstop is pre-pressed and bonded for 30±5 minutes, apply glue to the outer surface of the joint gap, wrap the joint gap with glued tin foil, and wrap two layers.

[0031] Furthermore, the connection positions include vertical connection points and vertical joints. The waterstop at the vertical connection point is cut by cutting the end of one of the waterstops into a shape that fits the side profile of the waterstop. The bonding surfaces of the waterstop at the vertical connection point are the end faces and side faces of the two waterstops.

[0032] The cutting method at the vertical connection is as follows: cut off half of the left and right symmetrically on the end cross section of each of the two waterstops that are connected at the ends, and the bonding surface at the vertical connection is the end face of the two waterstops.

[0033] Furthermore, the waterstop positioning and installation steps are as follows: after the waterstop is spliced, it is installed as a whole in the installation groove of the end template;

[0034] The steps for clamping and fixing the waterstop are as follows: After adjusting the position of the waterstop in the installation groove, install the clamps on both sides of the waterstop in the installation groove. The clamps are directly fixed by inserting spring bolts into nuts on the side of the end template, and the waterstop is clamped at the same time.

[0035] The beneficial effects of this invention are as follows:

[0036] 1. Cost savings

[0037] The modular adjustable clamp device used in this invention to install and fix the waterstop has a significant cost advantage, which can save a lot of costs for the project.

[0038] 2. Fast construction efficiency

[0039] The use of modular adjustable clamps and rapid installation technology significantly improves the installation efficiency of waterstops and shortens the construction cycle.

[0040] 3. High turnover efficiency

[0041] Traditional waterstop installation and fixing processes are all one-time constructions, while the application of modular adjustable clamp devices for waterstop installation and fixing allows for reuse, greatly improving turnover efficiency and reducing construction costs.

[0042] 4. Good construction quality

[0043] Modular adjustable clamps are used to install and fix the waterstop, ensuring accurate installation and good sealing. This effectively solves the problems of water and sand prevention during underwater installation of the box culvert, and improves the overall stability of the box culvert installation structure. Attached Figure Description

[0044] Figure 1 A schematic diagram of the overall assembly of the precast box culvert waterstop fixing device;

[0045] Figure 2 for Figure 1 AA section diagram;

[0046] Figure 3 This is a bottom view of the linear clamp unit;

[0047] Figure 4 This is a bottom view of the arc-shaped clamp unit;

[0048] Figure 5 This is a schematic diagram of the assembly of the top and bottom end templates and fixtures;

[0049] Figure 6 This is a schematic diagram of the assembly of the end template and fixture for the middle partition;

[0050] Figure 7 This is a schematic diagram of the side end template and fixture assembly;

[0051] Figure 8 A schematic diagram of the bonding joint at the vertical adhesive point of the stopbelt;

[0052] Figure 9 A schematic diagram of the bonding at the vertical joint of the stop hose.

[0053] Explanation of reference numerals in the attached figures:

[0054] 1. End template; 11. Top and bottom end templates; 12. Middle partition end template; 121. Skirt; 13. Side end template; 2. Fixture; 201. Mounting groove; 202. Nut; 21. Straight clamp unit; 22. Arc clamp unit; 3. Waterstop; 31. Adhesive surface; 4. Fixing bracket; 401. Adjusting screw; 402. Pin. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be further described clearly and completely below in conjunction with the embodiments of the present invention. It should be noted that the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0056] It should be noted that if there are directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...) involved in the embodiments of the present application, then such directional indications are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture (as shown in the drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0057] In the embodiments of the present application, the term "and / or" only describes the association relationship of associated objects and indicates that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone.

[0058] The terms "first" and "second" in the embodiments of the present application are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a system, product, or device that includes a series of components or units is not limited to the listed components or units, but may optionally further include components or units not listed, or may optionally further include other components or units inherent to these products or devices. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0059] Referring to "embodiments" herein means that the specific features, structures, or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0060] The precast box culvert water stop fixing device in the present invention is mainly designed for double-hole precast box culverts. The end face of the double-hole precast box culvert is in the shape of a horizontally placed Chinese character 'ri', but it can also be applied to single-hole or multi-hole precast box culverts, such as Figure 1As shown, in an embodiment taking a double-hole precast box culvert as an example, its overall contour is in the shape of a horizontally placed Chinese character 'Ri', which fits the end face contour shape of the double-hole precast box culvert. It mainly includes an end template 1, a waterstop 3, a fixture 2 for fixing the waterstop 3, and a fixing bracket 4 for fixing the end template.

[0061] Specifically, as Figure 5-7 shown, in an embodiment for a double-hole precast box culvert, the end template 1 is spliced by multiple structured template units, specifically including top and bottom end templates 11, a middle partition end template 12, and side end templates 13. Among them, the top and bottom end templates 11 are vertical, forming the top and bottom edges of the end template 1; both ends of the middle partition end template 12 are respectively connected to the middle parts of the top and bottom end templates 11 on the top and bottom edges, and there are skirt plates 121 on both sides of each end of the middle partition end template 12, which are used to enhance the tightness of the connection with the top and bottom end templates 11 and reduce shaking; the middle part of the side end template 13 is vertical, and both ends are bent 90 degrees in the same direction, and the side end templates 13 form the two side edges of the end template 1.

[0062] As Figure 2-4 shown, an inwardly recessed installation groove 201 is provided on the end template 1. At any cross-section on the extending path of the end template 1, the installation groove 201 is located in the middle of the end template 1. The fixtures 2 are oppositely installed on both sides of the installation groove 201 to clamp the waterstop 3. The fixture 2 is spliced by multiple structured fixture units, specifically including a straight fixture unit 21 and an arc fixture unit 22. The straight fixture unit 21 is used to be installed on the straight extending part of the installation groove 201, and the arc fixture unit 22 is used to be installed on the arc extending part of the installation groove 201, so that the fixture 2 can cover the entire extending path of the installation groove 201.

[0063] In addition, in the fixture 2, the straight fixture unit 21 and the arc fixture unit 22 have the same cross-sectional shape. The top of its cross-sectional shape is in a curved tooth shape, and a nut 202 is welded to its lower part. The nut 202 is specifically welded to the side with the same orientation as the top of the fixture 2 (that is, when the fixture 2 is installed in the installation groove 201, the nut 202 is located on the side of the fixture 2 close to the center of the installation groove 201). When the straight fixture unit 21 and the arc fixture unit 22 are installed in the installation groove 201, the curved tooth-shaped top faces the inside of the installation groove 201. Therefore, the fixture 2 can be directly fixed by inserting a spring bolt (not specifically shown in the figure) into the nut 202 on the side of the end template 1.

[0064] Specifically, multiple fixed supports 4 are also provided in the extension path of the end template 1. They are specifically set on the side of the end template 1 away from the mounting groove 201. The middle of the fixed support 4 can be inserted into the adjusting screw 401. The top of the adjusting screw 401 is rotatably connected to the bottom of the end template 1 through the pin 402. The two ends of the fixed support 4 can be bolted to the outer template (the outer template is used to support the casting surface of the precast box culvert to be poured, that is, the outer template is located between the end template 1 and the fixed support 4. The end template 1 is actually fixed to the outer template through the fixed support 4. The outer template is not specifically shown in the figure). This achieves the goal of fixing the end template 1 to the end of the precast box culvert to be poured.

[0065] Since precast box culverts are connected by extruding a dense waterstop during underwater installation, to ensure the sealing and stability of the joints between adjacent box culverts, effectively isolate water flow, and prevent seepage and sand leakage, the present invention selects TYPEQ130 rubber waterstop. This type of waterstop has the following advantages: (1) good elasticity and flexibility; (2) strong corrosion resistance and aging resistance; (3) good elastic recovery; (4) high compressive strength and deformation resistance; (5) easy to process, convenient to transport, and widely used in the cross-sectional installation of large box culvert structures, with high cost performance. Its cross-sectional shape and front shape are in Figures 8-9 It has already been shown in the text.

[0066] In this invention, the bonding between the waterstop strips 3 has two cases, such as... Figure 8 As shown ( Figure 8 The waterstop 3 shown is a front view. At the vertical connection between the waterstops 3 (T-shaped connection), the end of one of the waterstops 3 needs to be cut into a shape that fits the side profile of the waterstop 3. That is, at this time, the bonding surface 31 is the end face and the side face of the two waterstops 3 respectively; Figure 9 As shown ( Figure 9 The waterstop 3 shown in the figure is a top view. At the vertical connection between the waterstops 3, half of the left and right symmetrical parts of the end section of each of the two waterstops 3 that are connected at the end are cut off. That is, at this time the bonding surface 31 is the end face of the two waterstops 3.

[0067] The construction method of the precast box culvert waterstop fixing device in this invention specifically includes the following steps:

[0068] (1) Assembly of end templates

[0069] The end template is assembled from standard units in sections and fixed with bolts. After assembly, the extension centerline and flatness of the template are adjusted according to the design drawings.

[0070] (2) Waterstop splicing

[0071] The waterstop bonding adopts the "cold bonding method". After the bonding surface is cut at the joint position of the waterstop, the bonding surface is ground and cleaned with an electric grinder. Then, strong glue is evenly applied to the bonding surface. Finally, the waterstops at the joint are bonded together, squeezing out the gap. A pre-compression device (a common device in the existing technology) is used to compress the bonding joint to make it firm. After the waterstop is pre-compressed for about 30 minutes (±5 minutes) and the bonding is firm, glue is applied to the outer surface of the joint gap. The joint is wrapped with glue-coated aluminum foil, and two layers are wrapped to ensure a firm bond.

[0072] (3) Waterstop positioning and installation

[0073] The assembled waterstop is installed as a whole in the mounting groove of the end template.

[0074] (4) Clamping and fixing the waterstop

[0075] After the waterstop is installed and its position is adjusted, the clamps are installed on both sides of the waterstop in the installation groove. The clamps are directly fixed by inserting spring bolts into nuts on the side of the end template, which also clamps the waterstop.

[0076] (5) Overall installation of end template

[0077] After the waterstop is installed and fixed, the end template is fixed to the outer template of the precast box culvert using a fixing bracket.

[0078] (6) Pouring concrete

[0079] After all the end formwork was installed and passed inspection, concrete was poured, and the top of the waterstop was fixed to the end of the box culvert by the solidified concrete.

[0080] (7) Remove the end formwork

[0081] After the box culvert concrete is poured and reaches a certain strength, remove the spring bolts inserted on the side of the end formwork to release the waterstop. Prioritize the removal of the end formwork, which is then removed in sections. The removal sequence is from both sides towards the middle.

[0082] (8) Remove the clamps

[0083] After the end formwork was removed, the clamps of the waterstop fixing device remained on the completed box culvert, and the clamps were then removed manually.

[0084] In this invention, the end template of the precast box culvert waterstop fixing device is composed of standard modular unit structure segments. By reserving installation grooves on the end template, the waterstop is further fixedly installed on the end template using clamps. According to the difference in the shape of the waterstop at different cross-sectional positions, the clamping degree of the clamp is adjusted by adjusting the spring bolts to achieve the optimal state of fixing the waterstop.

[0085] The embodiments described above are merely illustrative of implementation methods of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A precast box culvert waterstop fixing device, used to fix the waterstop to the end of the precast box culvert to be poured, characterized in that, Including: End templates, fixtures, and fixing brackets; The end template is assembled by splicing multiple structured template units, and the overall contour of the end template fits the end face contour shape of the precast culvert; An installation groove recessed inward is provided on the end template. At any cross-section on the extending path of the end template, the installation groove is located in the middle of the end template; The fixture is assembled by splicing multiple structured fixture units. The fixture can cover the entire extending path of the installation groove. The fixture can be oppositely installed in the installation groove and fix the waterstop. A nut is welded on the side of the fixture close to the center of the installation groove; The fixing bracket is used to fix the end template at the end of the precast culvert to be poured; The following construction method is adopted for the precast culvert waterstop fixing device to fix and install the waterstop at the end of the precast culvert to be poured: The construction method successively includes: end template assembly, waterstop splicing, waterstop positioning and installation, waterstop clamping and fixing, overall installation of the end template, pouring concrete, removing the end template, and removing the fixture; The specific steps of the waterstop splicing are as follows: After the waterstop is cut and connected, use an electric grinder to polish the connection position after the waterstop is cut and clean it. Then evenly apply strong glue on the bonding surface. Finally, bond the waterstops at the docking place together, squeeze out the gaps, and use a pre-pressing device to squeeze the bonding place to make it firmly adhered; After the waterstop is pre-pressed and bonded for 30 ± 5 minutes, apply glue on the outer surface of the joint gap, wrap the joint seam with tinfoil coated with glue, and wrap it in two layers; The connection positions include vertical connection points and vertical connection points. The cutting method of the waterstop at the vertical connection point is: Cut the end of one of the waterstops into a shape that fits the side profile of the waterstop. The bonding surfaces of the waterstops at the vertical connection point are the end faces and sides of the two waterstops; The cutting method at the vertical connection point is: Cut off the left and right symmetric halves of the end sections of the two end-connected waterstops respectively. The bonding surfaces of the vertical connection point are the end faces of the two waterstops; 2. The precast box culvert waterstop fixing device according to claim 1, characterized in that, The end template unit includes top and bottom end templates and side end templates; The top and bottom end templates are vertical and are used to form the top and bottom edges of the end template; The middle part of the side end template is vertical. The two ends of the side end template are bent 90 degrees in the same direction, and the side end template forms the two side edges of the end template; 3. The precast box culvert waterstop fixing device according to claim 2, characterized in that, The precast culvert is a double-hole culvert, and the end face of the precast culvert is in the shape of a horizontally placed Chinese character "ri"; The end template unit further includes a middle partition end template. The two ends of the middle partition end template are respectively connected to the middle parts of the top and bottom end templates of the top and bottom edges, and there are skirt plates on both sides of each end of the middle partition end template; 4. The precast box culvert waterstop fixing device according to claim 1, characterized in that, The fixture unit includes a straight fixture unit and an arc fixture unit with the same cross-sectional shape. The top of the cross-sectional shape of the fixture unit is in a curved tooth shape, and the nut is welded at the lower part of the cross-sectional shape of the fixture unit; The bending direction of the top of the cross-sectional shape of the fixture unit faces the center of the installation groove; The linear clamp unit is used to be installed on the linear extension portion of the mounting groove, and the arc-shaped clamp unit is used to be installed on the arc-shaped extension portion of the mounting groove.

5. The precast box culvert waterstop fixing device according to claim 4, characterized in that, The clamping unit is fixed by inserting a spring bolt into the nut on the side of the end template.

6. The precast box culvert waterstop fixing device according to claim 1, characterized in that, The fixed bracket is disposed on the side of the end template opposite to the mounting groove. An adjusting screw can be inserted into the middle of the fixed bracket. The top of the adjusting screw is rotatably connected to the bottom of the end template through a pin. The two ends of the fixed bracket are bolted to the outer template, which is located between the end template and the fixed bracket. The outer template is used to support the casting surface of the precast box culvert to be poured.

7. A construction method for fixing and installing a waterstop strip to the end of a precast box culvert to be poured, characterized in that, The construction method requires the use of the precast box culvert waterstop fixing device according to any one of claims 1-6; The construction method includes, in sequence: end formwork assembly, waterstop splicing, waterstop positioning and installation, waterstop clamping and fixing, end formwork overall installation, concrete pouring, end formwork removal and clamp removal. The specific steps for splicing the waterstop are as follows: after the waterstop is cut and connected, the connection position after the waterstop is cut is ground and cleaned with an electric grinder, then strong adhesive is evenly applied to the bonding surface, and finally the waterstops at the joint are bonded together, the gap is squeezed out, and the bonding joint is pressed with a pre-compression device to make it bonded firmly. After the waterstop is pre-pressed and bonded for 30±5 minutes, apply glue to the outer surface of the joint gap, wrap the joint gap with glued tin foil, and wrap two layers. The connection positions include vertical connection points and vertical joints. The waterstop at the vertical connection point is cut by cutting the end of one of the waterstops into a shape that fits the side profile of the waterstop. The bonding surfaces of the waterstop at the vertical connection point are the end faces and side faces of the two waterstops. The cutting method at the vertical connection is as follows: cut off half of the left and right symmetrically on the end cross section of each of the two waterstops that are connected at the ends, and the bonding surface at the vertical connection is the end face of the two waterstops.

8. The construction method according to claim 7, characterized in that, The waterstop positioning and installation steps are as follows: After the waterstop is spliced, it is installed as a whole in the installation groove of the end template; The steps for clamping and fixing the waterstop are as follows: After adjusting the position of the waterstop in the installation groove, install the clamps on both sides of the waterstop in the installation groove. The clamps are directly fixed by inserting spring bolts into nuts on the side of the end template, and the waterstop is clamped at the same time.

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