Basement roof post-pouring belt advanced water stop prefabricated cover plate and construction method

Abstract

The application discloses a basement roof post-cast strip advanced water-stop prefabricated cover plate and a construction method, relates to the technical field of basement roof post-cast strips, and comprises a cover plate body, reinforcing rod pieces, a pouring bottom die and a grouting pipe, the cover plate body is internally provided with pouring holes, the pouring holes correspond to the positions of construction joints, and the number of the cover plate bodies is multiple; the application further discloses an advanced water-stop construction method. The basement roof post-cast strip advanced water-stop prefabricated cover plate and the construction method realize advanced water-stop and post-grouting of the construction joint of the post-cast strip body through installation of the cover plate body, the closing time point of the post-cast strip body is greatly advanced, the reinforcing rod pieces arranged on the cover plate body can effectively improve the connection stability of the post-grouting concrete structure and the cover plate body or the post-cast strip body, the reinforcing rod pieces are helpful to prevent the structure in the construction joint of the post-cast strip body from falling off, the stability, the strength and the durability of the post-cast strip as a whole are greatly improved, and the practical effect of the device is enhanced.

Description

Technical Field

[0001] This invention relates to the field of post-cast strip technology for basement roof slabs, and more specifically, to a precast cover plate for advanced water-stopping of post-cast strips in basement roof slabs and its construction method. Background Technology

[0002] The post-cast strip on the basement roof slab is a key structural design in modern construction engineering. Its core function is to actively release and resolve most of the internal stress and deformation caused by temperature changes, concrete shrinkage, and uneven foundation settlement during the construction phase and the initial use. This measure can effectively prevent harmful cracks in the concrete structure, thereby ensuring the overall safety, long-term durability, and waterproof sealing performance of the structure.

[0003] However, traditional post-cast strip sealing has a significant engineering bottleneck: its sealing construction must wait until the main structure is completed and left to stand for a period of time until the concrete shrinkage is basically stable or the settlement meets the design requirements. This waiting period often lasts for several months, resulting in the post-cast strip being in an open state for a long time. This not only hinders subsequent work but also directly restricts the timely integration of key processes such as basement backfilling, waterproofing, and outdoor landscaping, becoming an important factor affecting overall construction efficiency and schedule control. In addition, after the existing post-cast strip is sealed, the construction joint is sealed by filling it with concrete or grout. However, this construction method results in poor connection between the cover plate and the post-cast strip and the solidified concrete structure, leading to poor integrity and a risk of detachment over long-term use. Summary of the Invention

[0004] In view of this, the purpose of this invention is to provide a precast cover plate for advanced water-stopping of the post-pouring strip in the basement roof slab and a construction method thereof. The advanced water-stopping function is achieved through the precise construction of the cover plate body, allowing installation to be completed during the main structure construction process. This significantly advances the closing time of the post-pouring strip. Furthermore, the concrete structure generated by post-grouting in this invention can be connected to the cover plate body and the post-pouring strip body through reinforcing members, which helps to improve the overall stability, strength and durability of the post-pouring strip.

[0005] To achieve the above objectives, the present invention provides a precast cover plate for advanced water-stopping of post-pouring strip in basement roof slab, comprising a bottom formwork, a post-pouring strip body disposed on the top of the bottom formwork, a construction joint disposed within the post-pouring strip body, and water-stopping steel plates located on both sides of the construction joint. The cover plate body has an injection hole inside, which corresponds to the position of the construction joint. There are multiple cover plate bodies. Waterproof mortar is provided between the cover plate body and the post-pouring strip body, as well as between two adjacent cover plate bodies. The reinforcing member includes several vertically embedded connecting rods in the cover plate body and arranged in a ring outside the injection hole, a steel bar horizontally installed outside the connecting rod, a threaded rod detachably installed at the bottom end of the connecting rod, and a stop plate installed on the outside of the top end of the threaded rod. The bottom mold for grouting includes a template located below the construction joint, a fixed seat installed at the bottom of the template, a plurality of threaded sleeves rotatably installed in the fixed seat and threadedly connected to the threaded rod, and a drive assembly installed in the fixed seat for driving the threaded sleeves to rotate. The template is fitted into the bottom of the bottom mold. The grouting pipe includes a first pipe body pre-embedded in the grouting hole and extending to the top of the cover plate body, a water-stopping wing ring installed on the outer side of the bottom end of the first pipe body, a connecting sleeve fitted on the top end of the first pipe body, and a second pipe body whose bottom end is inserted into the connecting sleeve.

[0006] Furthermore, a bottom steel mesh is provided inside the cover plate body, a tongue and groove female tenon is provided on one side of the cover plate body in the width direction, and a tongue and groove male tenon adapted to the tongue and groove female tenon is provided on the other side, and a lifting ring is fixedly connected to the top of the cover plate body.

[0007] Furthermore, it also includes a waterproof additional layer, which is configured to cover the upper surface of the cover plate body, and the waterproof additional layer flips up and extends into the pipe at least cm when it encounters the grouting pipe.

[0008] Furthermore, the upper surface of the abutment plate and the top surface of the template are at the same horizontal level as the bottom surface of the post-pouring strip body, and the top surface of the template is provided with a positioning groove that corresponds to the position of the abutment plate and is sized to fit it.

[0009] Furthermore, the drive assembly includes a transmission gear fixedly mounted on the outside of the threaded sleeve, a drive gear rotatably mounted in the fixed seat and meshing with the transmission gear, and a handwheel rotatably mounted on the bottom of the fixed seat and fixedly connected to the drive gear.

[0010] Furthermore, the connecting sleeve includes, from top to bottom, an upper straight pipe section, an inner concave section, and a lower straight pipe section. The upper straight pipe section and the lower straight pipe section are symmetrically arranged. The inner diameter of the inner concave section is smaller than the inner diameter of the upper straight pipe section and the lower straight pipe section. The inner diameters of the upper straight pipe section and the lower straight pipe section are respectively adapted to the outer wall dimensions of the second pipe body and the first pipe body.

[0011] This invention also provides a method for prefabricated cover plate pre-sealing construction, comprising the following steps: Step S1: Design and manufacture of the cover plate body. The reinforcement ratio and thickness of the cover plate body are designed based on the width of the post-pouring strip body and the soil cover thickness. The spacing of the grouting holes is set according to the thickness of the structure to be poured and the density of the reinforcing bars. The cover plate body is manufactured according to the design requirements. Step S2: Pre-treatment of the post-pouring strip body. After the concrete on both sides of the post-pouring strip body is poured and hardened, the concrete at the construction joint is roughened, internal debris is cleaned, and the waterstop steel plate is exposed. Step S3: The installation of the cover plate body involves using the waterproof mortar to form a grout on the top of the post-pouring strip body, then hoisting the cover plate body into place, and using the waterproof mortar to fill the tongue and groove joint between the two cover plate bodies. Step S4: Waterproof layer construction. The additional waterproof layer is constructed on the base layer of the installed cover plate body. When the additional waterproof layer encounters the grouting pipe, it is turned up and extends into the pipe by at least cm. Step S5: Post-cast concrete pouring. After the post-cast strip body meets the sealing conditions, self-compacting micro-expansion impermeable concrete or high-strength grout is poured into the construction joint through the grouting pipe and then vibrated to compact it. Step S6: Post-processing. After the concrete of the post-pouring strip body is poured and cured, the grouting pipe that exposes the waterproof layer is cut and removed, and the opening is sealed.

[0012] Furthermore, in step S1, the production of the cover plate body according to the design requirements also includes setting the tongue and groove female tenon and the tongue and groove male tenon on both sides of the width direction of the cover plate body, and setting the lifting ring on the top of the cover plate body.

[0013] Furthermore, in step S3, the installation of the cover plate body also includes connecting the horizontally arranged reinforcing steel member to the reinforcing steel frame in the post-cast strip body.

[0014] Furthermore, in step S5, the compaction process includes using an immersion vibrator to ensure the concrete is compacted.

[0015] Compared with the prior art, the present invention has the following advantages and effects: 1. The precast cover plate and construction method for advanced water-stopping of the post-pouring strip in the basement roof slab of the present invention achieves advanced water-stopping and post-grouting of the construction joint of the post-pouring strip through the installation of the cover plate body. The closing time of the post-pouring strip body is significantly advanced, and the reinforcing rods set on the cover plate body can effectively improve the connection stability between the post-grouting concrete structure and the cover plate body or the post-pouring strip body, which helps to prevent the structure inside the construction joint of the post-pouring strip body from falling off, greatly improving the overall stability, strength and durability of the post-pouring strip, and enhancing the practical effect of the device.

[0016] 2. The precast cover plate and construction method for the pre-sealed water-stopping strip of the basement roof slab in this invention allows for flexible length adjustment of the grouting pipe through the setting of connecting sleeves. During construction, the height of the sleeve can be quickly and economically adjusted according to the varying soil thickness in the project, eliminating the need for on-site welding and avoiding problems such as complex procedures, extended construction period, and difficult quality control caused by welding, thus achieving rapid assembly construction. In addition, the excess part of the grouting pipe can be removed by cutting later to separate the temporary construction component from the permanent structure, removing obstacles for waterproof protective layer, earthwork backfilling, landscaping and other processes on the basement roof slab, avoiding interference from protruding steel sleeves to subsequent construction, resulting in a more beautiful and flat finished surface, and eliminating the risk of stress concentration or local damage that may be caused by permanent steel sleeves. Attached Figure Description

[0017] Figure 1 This is a cross-sectional schematic diagram of the use of the precast cover plate for the pre-water-stopping of the post-pouring strip in the basement roof slab in an embodiment of the present invention. Figure 2 This is a three-dimensional structural diagram of the precast cover plate for the pre-water-stopping of the post-pouring strip in the basement roof slab, as described in an embodiment of the present invention. Figure 3 This is a bottom cross-sectional view of the reinforcing member of the precast cover plate for the precast water-stopping strip of the basement roof slab in an embodiment of the present invention, after being connected to the fixing seat of the bottom formwork for pouring.

[0018] Explanation of reference numerals in the attached figures: 1-Cover plate body; 11-Bottom steel mesh; 12-Mouth tongue and groove female tenon; 13-Mouth tongue and groove male tenon; 2-Hanging ring; 3-Reinforcing member; 31-Connecting rod; 32-Threaded rod; 33-Support plate; 34-Reinforcing steel member; 4-Injection mold; 41-Template; 42-Fixed base; 43-Threaded sleeve; 44-Transmission gear; 45-Drive gear; 46-Handwheel; 5-Grouting pipe; 51-First pipe body; 52-Water-stop wing ring; 53-Second pipe body; 54-Connecting sleeve; 6-Waterproof mortar; 7-Post-pouring strip body; 71-Waterstop steel plate; 72-Construction joint; 8- Waterproof additional layer; 9- Bottom mold component. Detailed Implementation

[0019] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] Please see Figure 1-3 As shown, this embodiment of the invention provides a precast cover plate for advanced water-stopping of the post-pouring strip in a basement roof slab. It is applied to the bottom formwork 9, the post-pouring strip body 7, the construction joint 72, and the water-stopping steel plate 71. The post-pouring strip body 7 is set on the top of the bottom formwork 9, the construction joint 72 is set inside the post-pouring strip body 7, and the water-stopping steel plate 71 is set inside the post-pouring strip body 7 and located on both sides of the construction joint 72. Specifically, the precast cover plate for advanced water-stopping of the post-pouring strip in a basement roof slab includes a cover plate body 1, a reinforcing rod 3, a grouting bottom formwork 4, and a grouting pipe 5.

[0022] The cover plate body 1 is provided with injection holes, which correspond to the construction joint 72. There are multiple cover plate bodies 1. Waterproof mortar 6 is provided between the cover plate body 1 and the post-pouring strip body 7, as well as between two adjacent cover plate bodies 1. The injection holes are used to fill the construction joint 72 with concrete or grout. The waterproof mortar 6 is a functional material that gives traditional mortar excellent impermeability by incorporating waterproofing agents, polymers and other materials. In this embodiment, the function of the waterproof mortar 6 is to form a continuous, dense and impermeable barrier by filling and plastering, preventing water from entering key joints and parts.

[0023] The reinforcing member 3 includes a connecting rod 31, a reinforcing bar 34, a threaded rod 32, and a stop plate 33. Several connecting rods 31 are vertically embedded in the cover plate body 1 and arranged in a ring outside the injection hole. The reinforcing bar 34 is horizontally installed outside the connecting rod 31. The threaded rod 32 is detachably installed at the bottom end of the connecting rod 31. The stop plate 33 is installed on the outside of the top end of the threaded rod 32. As a further description of the above scheme, the steel reinforcement 34 provided on the connecting rod 31 can not only maintain the connection between two adjacent connecting rods 31, but also enhance the connection effect between the post-grouting concrete structure in the construction joint 72 and the post-cast strip body 7 after the construction joint 72 is filled with concrete or grout. This connection between the steel reinforcement 34 and the steel frame in the post-cast strip body 7 improves the structural strength of the post-grouting concrete structure in the construction joint 72, thereby enhancing the integrity and durability of the post-grouting concrete structure and the post-cast strip body 7 while improving the sealing effect.

[0024] The bottom mold 4 includes a template 41, a fixed seat 42, threaded sleeves 43 and a drive assembly. The template 41 is located below the construction joint 72. The fixed seat 42 is installed at the bottom of the template 41. Several threaded sleeves 43 are rotatably installed in the fixed seat 42 and are threadedly connected to the threaded rod 32. The drive assembly is installed in the fixed seat 42 to drive the threaded sleeves 43 to rotate. The template 41 is fitted into the bottom of the bottom mold 9.

[0025] As a further description of the above scheme, the drive component is set to rotate the threaded sleeve 43, so that the threaded connection between the threaded sleeve 43 and the threaded rod 32 can make the template 41 move upward along the axis of the threaded rod 32, thereby making the template 41 fit into the bottom of the bottom mold 9, thus achieving the function of sealing the bottom of the construction joint 72 and preventing the concrete or grout to be injected later from flowing out of the construction joint 72; and after the concrete structure injected later in the construction joint 72 has solidified and hardened, the template 41 needs to be removed, and the threaded rod 32 can be removed to ensure the flatness of the bottom of the post-pouring strip body 7.

[0026] As a preferred embodiment of the above solution, the detachable connection methods of the connecting rod 31 and the threaded rod 32 include coupling connection, flange connection, threaded connection, and transverse pin connection, so as to facilitate the disassembly of the connecting rod 31 and the threaded rod 32; in addition, in another embodiment, the connecting rod 31 and the threaded rod 32 can also adopt an integral design, and the connecting rod 31 and the threaded rod 32 can be disassembled by machine cutting.

[0027] The grouting pipe 5 includes a first pipe body 51, a water-stopping wing ring 52, a connecting sleeve 54, and a second pipe body 53. The first pipe body 51 is pre-embedded in the grouting hole and extends to the top of the cover plate body 1. The water-stopping wing ring 52 is installed on the outside of the bottom end of the first pipe body 51. The connecting sleeve 54 is fitted onto the top end of the first pipe body 51. The bottom end of the second pipe body 53 is inserted into the connecting sleeve 54.

[0028] As a further description of the above scheme, the connecting sleeve 54 above the first pipe body 51 and the second pipe body 53 are easy to disassemble, which can achieve the function of adjusting the overall height of the grouting pipe 5 as needed. This allows for quick and economical adjustment of the height of the grouting pipe 5 according to the varying soil cover thickness during construction, realizing rapid assembly construction and enhancing the practicality and applicability of the device.

[0029] Please see Figure 1-3 As shown, a bottom steel mesh 11 is provided inside the cover plate body 1. A tongue and groove female tenon 12 is provided on one side of the width direction of the cover plate body 1, and a tongue and groove male tenon 13 that is adapted to the tongue and groove female tenon 12 is provided on the other side. A lifting ring 2 is fixedly connected to the top of the cover plate body 1.

[0030] As a further description of the above scheme, the bottom layer steel mesh 11 is arranged at the bottom of the cover plate body 1, which is suitable for resisting the tensile stress generated at the bottom of the cover plate body 1, thereby preventing concrete cracking. At the same time, the bottom layer steel mesh 11 set in the cover plate body 1 can also play the role of uniformly distributing load, limiting cracks, and enhancing the deformation resistance of the cover plate body 1. The tongue and groove female tenon 12 and tongue and groove male tenon 13 set can enable two adjacent cover plate bodies 1 to interlock to achieve connection, and ensure quick, accurate and stable connection operation. The lifting ring 2 set can facilitate the lifting operation of lifting equipment, making it convenient to move and transport the cover plate body 1.

[0031] Please see Figure 1 As shown, the precast cover plate for the pre-water-stopping of the post-pouring strip of the basement roof slab also includes a waterproof additional layer 8. The waterproof additional layer 8 is configured to cover the upper surface of the cover plate body 1, and the waterproof additional layer 8 turns up and extends into the grouting pipe 5 by at least 5cm when it encounters the grouting pipe 5.

[0032] As a further description of the above scheme, the waterproof additional layer 8 helps to form a continuous and reliable waterproof seal, improving the overall waterproof sealing performance of the cover plate body 1. In this process, when the waterproof additional layer 8 encounters the grouting pipe 5, it flips up and extends into the pipe by at least 5cm. This operation can embed the waterproof structure into the weak waterproof position of the grouting pipe 5 opening, effectively preventing water vapor or liquid from seeping into the interior of the post-pouring strip body 7 from the micro gaps at the junction of the cover plate body 1 and the grouting pipe 5, greatly improving the reliability and durability of the advanced water-stopping system.

[0033] Please see Figure 1 As shown, the upper surface of the abutment plate 33 and the top surface of the template 41 are at the same horizontal height as the bottom surface of the post-pouring strip body 7. The top surface of the template 41 is provided with a positioning groove that corresponds to the position of the abutment plate 33 and is adapted in size.

[0034] As a further description of the above solution, the upper surface of the backing plate 33 and the top surface of the template 41 are at the same horizontal height as the bottom surface of the post-pouring strip body 7. This can effectively maintain the flatness of the post-grouting concrete structure in the construction joint 72, and at the same time, it can also avoid the bottom surface height of the post-grouting concrete structure from being too different from the bottom surface height of the post-pouring strip body 7.

[0035] Please see Figure 1-3As shown, the drive assembly includes a transmission gear 44, a drive gear 45, and a handwheel 46. The transmission gear 44 is fixedly mounted on the outside of the threaded sleeve 43. The drive gear 45 is rotatably mounted inside the fixed seat 42 and meshes with the transmission gear 44. The handwheel 46 is rotatably mounted on the bottom of the fixed seat 42 and is fixedly connected to the drive gear 45. By rotating the handwheel 46, the drive gear 45 can be driven to rotate. The rotation of the drive gear 45 can drive the transmission gear 44 and the threaded sleeve 43 to rotate. The rotation of the threaded sleeve 43 can drive the fixed seat 42 and the template 41 to move along the axis of the threaded rod 32.

[0036] Please see Figure 1 As shown, the connecting sleeve 54 includes an upper straight pipe section, a concave section and a lower straight pipe section from top to bottom. The upper straight pipe section and the lower straight pipe section are symmetrically arranged. The inner diameter of the concave section is smaller than the inner diameter of the upper straight pipe section and the lower straight pipe section. The inner diameters of the upper straight pipe section and the lower straight pipe section are adapted to the outer wall dimensions of the second pipe body 53 and the first pipe body 51, respectively.

[0037] As a further description of the above solution, by using the size adaptation between the lower straight pipe section and the first pipe body 51 to install the connecting sleeve 54 onto the top of the first pipe body 51, the coaxiality can be ensured and the connecting sleeve 54 can be prevented from shaking on the first pipe body 51, thus keeping the installation of the first pipe body 51 stable. Similarly, by using the upper straight pipe section to connect the connecting sleeve 54 to the second pipe body 53, the coaxiality can also be ensured and the second pipe body 53 can be prevented from shaking relative to the connecting sleeve 54, so as to achieve flexible adjustment of the height of the grouting pipe 5 while maintaining the stability of the grouting pipe 5 in use. As a further description of the above solution, since the inner diameter of the concave section is smaller than the inner diameters of the upper and lower straight pipe sections, when concrete or grout flows from the second pipe body 53 to the first pipe body 51, the concrete or grout flowing in the second pipe body 53 will slide downward under the guiding action of the upper straight pipe section and the inner wall of the concave section. In addition, the size matching between the upper straight pipe section and the second pipe body 53 can prevent concrete or grout from flowing into the gap between the second pipe body 53 and the connecting sleeve 54. At the same time, the concrete or grout flowing in the connecting sleeve 54 will slide downward under the guiding action of the inner wall of the concave section and the lower straight pipe section. In addition, the size matching between the lower straight pipe section and the first pipe body 51 can prevent concrete or grout from contacting the gap between the first pipe body 51 and the connecting sleeve 54, thereby effectively preventing concrete or grout from seeping out.

[0038] Please see Figure 1-3 As shown, the present invention also provides a method for prefabricated cover plate pre-sealing construction, comprising the following steps: Step S1: Design and fabrication of cover plate body 1. The reinforcement ratio and thickness of cover plate body 1 are designed based on the width of post-pouring strip body 7 and the thickness of soil cover. The spacing of grouting holes is set according to the thickness of the structure to be poured and the density of steel bars. Cover plate body 1 is fabricated and produced according to design requirements. Step S2: Pretreatment of the post-cast strip body 7. After the concrete on both sides of the post-cast strip body 7 is poured and hardened, the concrete at the construction joint 72 is roughened, internal debris is cleaned, and the waterstop steel plate 71 is exposed. Step S3: Install the cover plate body 1, apply waterproof mortar 6 to the top of the post-pouring strip body 7, then hoist the cover plate body 1 into place, and use waterproof mortar 6 to fill the tongue and groove joint between the two cover plate bodies 1. Step S4: Waterproof layer construction. Apply additional waterproof layer 8 on the base layer of the installed cover plate body 1. When the additional waterproof layer 8 encounters the grouting pipe 5, it turns up and extends into the pipe by at least 5cm. Step S5: Post-cast concrete pouring. After the post-cast strip body 7 meets the sealing conditions, self-compacting micro-expansion impermeable concrete or high-strength grout is poured into the construction joint 72 through the grouting pipe 5 and then vibrated to compact it. Step S6: Post-processing. After the concrete of the post-pouring strip body 7 is poured and cured, the grouting pipe 5 that exposes the waterproof layer is cut and removed, and the opening is sealed.

[0039] In step S3, grouting refers to laying a layer of mortar or cement grout with a certain strength and thickness on the bottom of the component before installation. The main function of this grout is not only bonding, but more importantly, leveling, transferring loads, and ensuring tight contact. In this application, waterproof mortar 6 is used to grout the cover plate body 1.

[0040] Specifically, in step S1, the cover plate body 1 is manufactured according to the design requirements, and the tongue and groove female tenon 12 and tongue and groove male tenon 13 are respectively set on both sides of the width direction of the cover plate body 1, and the lifting ring 2 is set on the top of the cover plate body 1.

[0041] Specifically, in step S3, the installation of the cover plate body 1 also includes connecting the horizontally arranged steel bar 34 to the steel bar frame in the post-pouring strip body 7.

[0042] Specifically, in step S5, compaction is performed, including using an immersion vibrator to ensure the concrete is compacted.

[0043] It should be noted that the order of operation of steps S1 and S2 is not mandatory in the embodiments of the present invention. Either step S1 or step S2 can be performed first, or they can be performed simultaneously if there are enough manpower.

[0044] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the scope of protection of this invention.

Claims

1. A precast cover plate for pre-sealed water-stopping of post-cast strip in basement roof slab, comprising a bottom formwork (9), a post-cast strip body (7) disposed on top of the bottom formwork (9), a construction joint (72) disposed within the post-cast strip body (7), and water-stopping steel plates (71) located on both sides of the construction joint (72), characterized in that: Cover plate body (1), the cover plate body (1) is provided with a grouting hole, the grouting hole corresponds to the position of the construction joint (72), there are multiple cover plate bodies (1), and waterproof mortar (6) is provided between the cover plate body (1) and the post-pouring strip body (7) and between two adjacent cover plate bodies (1). The reinforcing member (3) includes several vertically embedded connecting rods (31) arranged in a ring outside the injection hole, a steel bar (34) horizontally installed outside the connecting rod (31), a threaded rod (32) detachably installed at the bottom end of the connecting rod (31), and a stop plate (33) installed on the outside of the top end of the threaded rod (32). The bottom mold (4) includes a template (41) located below the construction joint (72), a fixed seat (42) installed at the bottom of the template (41), a plurality of threaded sleeves (43) rotatably installed in the fixed seat (42) and threadedly connected to the threaded rod (32), and a drive assembly installed in the fixed seat (42) for driving the threaded sleeves (43) to rotate. The template (41) is fitted into the bottom of the bottom mold (9). The grouting pipe (5) includes a first pipe body (51) pre-embedded in the grouting hole and extending to the top of the cover plate body (1), a water-stop wing ring (52) installed on the outside of the bottom end of the first pipe body (51), a connecting sleeve (54) fitted on the top end of the first pipe body (51), and a second pipe body (53) with its bottom end inserted into the connecting sleeve (54).

2. The precast cover plate for advanced water-stopping of the post-cast strip in the basement roof slab according to claim 1, characterized in that, The cover plate body (1) is provided with a bottom steel mesh (11). A tongue and groove female tenon (12) is provided on one side of the width direction of the cover plate body (1), and a tongue and groove male tenon (13) adapted to the tongue and groove female tenon (12) is provided on the other side. A lifting ring (2) is fixedly connected to the top of the cover plate body (1).

3. The precast cover plate for advanced water-stopping of the post-cast strip in the basement roof slab according to claim 1, characterized in that, Also includes: A waterproof additional layer (8) is provided, which is configured to cover the upper surface of the cover plate body (1) and to turn up and extend into the grouting pipe (5) by at least 5 cm when the waterproof additional layer (8) encounters the grouting pipe (5).

4. The precast cover plate for advanced water-stopping of the post-cast strip in the basement roof slab according to claim 1, characterized in that, The top surface of the abutment plate (33) and the top surface of the template (41) are at the same horizontal level as the bottom surface of the post-pouring strip body (7). The top surface of the template (41) is provided with a positioning groove that corresponds to the position of the abutment plate (33) and is adapted in size.

5. The precast cover plate for advanced water-stopping of the post-cast strip in the basement roof slab according to claim 1, characterized in that, The drive assembly includes a transmission gear (44) fixedly mounted on the outside of the threaded sleeve (43), a drive gear (45) rotatably mounted in the fixed seat (42) and meshing with the transmission gear (44), and a handwheel (46) rotatably mounted on the bottom of the fixed seat (42) and fixedly connected to the drive gear (45).

6. The precast cover plate for advanced water-stopping of the post-cast strip in the basement roof slab according to claim 1, characterized in that, The connecting sleeve (54) includes, from top to bottom, an upper straight pipe section, an inner concave section and a lower straight pipe section. The upper straight pipe section and the lower straight pipe section are symmetrically arranged. The inner diameter of the inner concave section is smaller than the inner diameter of the upper straight pipe section and the lower straight pipe section. The inner diameters of the upper straight pipe section and the lower straight pipe section are respectively adapted to the outer wall dimensions of the second pipe body (53) and the first pipe body (51).

7. A prefabricated cover plate advanced water-stopping construction method based on any one of claims 1-6, characterized in that, Includes the following steps: Step S1: Design and manufacture of the cover plate body (1). The reinforcement ratio and thickness of the cover plate body (1) are designed based on the width of the post-pouring strip body (7) and the soil cover thickness. The spacing of the grouting holes is set according to the thickness of the structure to be poured and the density of the reinforcing bars. The cover plate body (1) is manufactured according to the design requirements. Step S2: Pretreatment of the post-cast strip body (7): After the concrete on both sides of the post-cast strip body (7) is poured and hardened, the concrete at the construction joint (72) is roughened, internal debris is cleaned, and the waterstop steel plate (71) is exposed. Step S3: The installation of the cover plate body (1) is carried out by applying the waterproof mortar (6) to the top of the post-pouring strip body (7), then hoisting the cover plate body (1) into place, and using the waterproof mortar (6) to fill the tongue and groove joint between the two cover plate bodies (1). Step S4: Waterproof layer construction. The waterproof additional layer (8) is constructed on the base layer of the installed cover plate body (1). When the waterproof additional layer (8) encounters the grouting pipe (5), it is turned up and extends into the pipe by at least 5cm. Step S5: Post-cast concrete pouring. After the post-cast strip body (7) meets the sealing conditions, self-compacting micro-expansion impermeable concrete or high-strength grout is poured into the construction joint (72) through the grouting pipe (5) and compacted by vibration. Step S6: Post-processing. After the concrete of the post-pouring strip body (7) is poured and cured, the grouting pipe (5) that exposes the waterproof layer is cut off and removed, and the opening is sealed.

8. The precast cover plate advanced water-stopping construction method according to claim 7, characterized in that, In step S1, the production of the cover plate body (1) according to design requirements further includes: The tongue and groove female tenon (12) and the tongue and groove male tenon (13) are respectively provided on both sides of the width direction of the cover plate body (1), and the lifting ring (2) is provided on the top of the cover plate body (1).

9. The precast cover plate advanced water-stopping construction method according to claim 7, characterized in that, In step S3, the installation of the cover plate body (1) further includes: The horizontally arranged steel reinforcement member (34) is connected to the steel reinforcement frame in the post-cast strip body (7).

10. The precast cover plate advanced water-stopping construction method according to claim 7, characterized in that, In step S5, the compaction process includes using an immersion vibrator to ensure the concrete is compacted.

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