Basement roof post-cast strip pre-sealing waterproof structure and construction method thereof

Abstract

The invention discloses a basement top plate post-cast strip pre-sealing waterproof structure and a construction method thereof, a basement top plate is provided with post-cast concrete and a prefabricated cover plate in a post-cast strip area from bottom to top in sequence, and the basement top plate is provided with a base layer, a waterproof layer, a felt isolation layer and a concrete protection layer embedded with a reinforcing mesh in other areas from bottom to top in sequence; the prefabricated cover plate is a prefabricated part, the middle of the prefabricated cover plate is provided with a grouting pipe used for pouring into the post-cast strip, transverse rib penetrating holes are distributed in the side face of the prefabricated cover plate, one longitudinal end of the prefabricated cover plate is provided with a tongue-and-groove with a vacant upper portion, the bottom face of the prefabricated cover plate is provided with a waterproof pre-laying layer, the top end of the grouting pipe is higher than backfill soil, and the waterproof pre-laying layer is provided with throwing stubbles at the two longitudinal ends and the two transverse ends of the prefabricated cover plate. The prefabricated cover plates stretch across the base layers supported on the two sides and are tightly spliced in the longitudinal direction of the post-cast strip. According to the waterproof structure, earthwork backfilling and post-cast strip pouring can be conducted at the same time, and the waterproof effect of the basement roof can be ensured.

Description

Technical Field

[0001] The invention relates to a basement top slab, and in particular to a pre-sealed waterproof structure of a post-cast belt of a basement top slab and a construction method thereof. Background Art

[0002] The purpose of the post-cast strip is to prevent harmful cracks that may occur in the reinforced concrete structure due to uneven shrinkage or uneven settlement. It is a concrete strip reserved between the base slab, wall, and beam according to construction requirements. After the concrete on both sides of the post-cast strip of the basement is poured, the post-cast strip has a placement period, which is generally not less than one month. During the placement period, the post-cast strip needs to be temporarily protected to prevent debris and sewage from entering the post-cast strip, so as not to affect the subsequent post-cast strip pouring. After the placement period, the post-cast strip pouring, waterproof layer construction, and earth backfilling will be carried out in sequence. At present, the waterproof layer construction and earth backfilling can only be carried out after the post-cast strip is poured and the maintenance is completed, which seriously delays the construction progress. Summary of the invention

[0003] The purpose of the present invention is to provide a pre-sealed waterproof structure of a basement roof slab post-cast strip, and a construction method of the above-mentioned pre-sealed waterproof structure of a basement roof slab post-cast strip. The waterproof structure can realize the simultaneous backfilling of earth and pouring of the post-cast strip, and can ensure the waterproof effect of the basement roof.

[0004] The technical solution adopted by the present invention is: A pre-sealed waterproof structure of a post-cast strip of a basement roof, wherein the basement roof in the post-cast strip area is composed of post-cast concrete and a prefabricated cover plate from bottom to top, and the basement roof in the remaining area is composed of a base layer, a waterproof layer, a linoleum isolation layer and a concrete protective layer with a steel mesh embedded therein from bottom to top; the prefabricated cover plate is a prefabricated part, wherein a grouting pipe for pouring into the post-cast strip is provided in the middle, transverse reinforcement holes are distributed on the side, a tongue and groove with an upper vacancy is provided at one longitudinal end, and a waterproof pre-laid layer is provided on the bottom, the top of the grouting pipe is higher than the height of the backfill soil, and the waterproof pre-laid layer is provided in the pre-cast strip. Both longitudinal and transverse ends of the prefabricated cover plate are provided with stubbles; the prefabricated cover plate is supported across the base layers on both sides and is tightly spliced ​​along the longitudinal direction of the post-cast strip; the waterproof layer is laid on the transverse stubbles of the waterproof pre-laid layer and then extends to the side of the prefabricated cover plate; the transverse steel bars connected to the steel mesh are inserted into the corresponding reinforcement holes; the longitudinal stubbles of one end of the waterproof pre-laid layer are attached to the front end face and tread of its own tongue and groove, and the longitudinal stubbles of the other end are attached to the original longitudinal stubbles on the front end face and tread of the adjacent tongue and groove and are overlapped and fixed; the gaps in the tongue and groove between adjacent prefabricated cover plates are sealed and filled.

[0005] Preferably, the gaps at the tongue and groove between adjacent prefabricated cover plates are sealed and filled with caulking sealant and slightly expanded fine stone concrete, with the caulking sealant being located at the lower layer and the slightly expanded fine stone concrete being located at the upper layer.

[0006] Preferably, a rough surface is provided on the tongue-and-groove riser at one end of the prefabricated cover plate and on the upper portion of the other end.

[0007] Preferably, a pipe-penetrating waterproof additional layer is provided on the lower side of the waterproof pre-laid layer on the bottom surface of the prefabricated cover plate, and the pipe-penetrating waterproof additional layer is annularly sleeved on the grouting pipe and extends upward to the inner wall of the grouting pipe.

[0008] Preferably, the waterproof pre-paved layer uses non-curing asphalt waterproof coating + SBS asphalt self-adhesive waterproof membrane, and the adjacent overlapping longitudinal stubbles are fixed by heat treatment.

[0009] Preferably, the grouting pipe is made of PE pipe or steel pipe. If PE pipe is used, it is sealed by hot melting, and if steel pipe is used, it is sealed by steel plate welding.

[0010] Preferably, one side of the prefabricated cover plate exceeds the post-cast strip by 200mm to 300mm, and one side of the waterproof pre-laid layer exceeds the prefabricated cover plate by 200mm to 300mm.

[0011] Preferably, the base layer adopts a reinforced concrete structure, the prefabricated cover plate adopts a reinforced concrete slab, the post-poured concrete adopts a higher grade micro-expansive concrete, the base layer sides on both sides of the post-poured strip are provided with roughening, the internal steel bars of the base layer are connected with the internal steel bars of the post-poured concrete, and a waterstop steel plate is provided along the line between the base layer and the post-poured concrete.

[0012] The above-mentioned construction method of the pre-sealed waterproof structure of the post-cast strip of the basement roof slab is as follows: first, the formwork and support of the basement roof slab are set up, and an independent support frame is set up in the post-cast strip area, and then the base concrete is poured; then the prefabricated cover plates are hoisted and installed in sequence, so that the prefabricated cover plates are supported across the base layers on both sides and are tightly spliced ​​along the longitudinal direction of the post-cast strip, and the transverse stubbles at both ends of the waterproof pre-paved layer are spread out and laid on the base layer, and the longitudinal stubbles at one end of the waterproof pre-paved layer are attached to the front end surface and tread of its own tongue and groove, and the longitudinal stubbles at the other end are attached to the original longitudinal stubbles on the front end surface and tread of the adjacent tongue and groove and overlapped and fixed, and the gaps in the tongue and groove between adjacent prefabricated cover plates are sealed and filled; then Construct the waterproof layer, which is extended on the horizontal bends of the pre-laid waterproof layer and then extended to the side of the prefabricated cover plate; then carry out a water-tightness test on the existing structure of the basement roof. After the test is qualified, lay a felt isolation layer on the waterproof layer, and then set a pad on the felt isolation layer, place a steel mesh on the pad, insert the horizontal steel bars connected to the steel mesh into the corresponding reinforcement holes, and then pour the concrete protective layer; finally, backfill the earth on the upper side of the basement roof and compact it layer by layer. At the same time, pour the post-cast strip through the grouting pipe until the slurry overflows evenly from the top of the grouting pipe. After the pouring of the post-cast strip is completed, remove the excess grouting pipe and seal the grouting pipe.

[0013] Preferably, the support frame of the post-cast zone area supports the template through the top support, main ribs and secondary ribs in sequence, and a cleaning port is provided on the template. The impurities in the post-cast zone are cleaned out through the cleaning port and then the cleaning port is closed.

[0014] The beneficial effects of the present invention are: The waterproof structure can realize the simultaneous backfilling of earth and pouring of post-casting belts, and there is no need to wait until the post-casting concrete is cured before carrying out waterproof layer construction and backfilling of earth, thereby improving construction efficiency and site utilization. In addition, the waterproof layer is formed in one step, further improving construction efficiency. The waterproof structure can ensure the waterproof effect of the basement roof. The horizontal edges of the waterproof layer and the waterproof pre-laid layer overlap each other, and the vertical edges of the waterproof pre-laid layer not only overlap each other but also use tongue-and-groove sealing to fill, thereby avoiding the leakage risk of the joints between the prefabricated cover plates, so that the basement roof forms an overall skin-type waterproof structure in the post-casting zone area and the rest of the area. The prefabricated cover plate in the waterproof structure is connected to the steel mesh embedded in the concrete protective layer by means of reinforcement holes, thereby improving the overall continuity. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional schematic diagram of the prefabricated cover.

[0016] Figure 2 It is a schematic diagram of the longitudinal section of the prefabricated cover.

[0017] Figure 3 This is a bottom view of the prefabricated cover.

[0018] Figure 4 It is a schematic diagram of the prefabricated cover plate when it is installed on the base.

[0019] Figure 5 It is a schematic diagram of the longitudinal splicing of two adjacent prefabricated cover plates.

[0020] Figure 6 It is a construction diagram of the pre-sealed waterproof structure of the post-cast strip of the basement top slab.

[0021] In the figure: 1-secondary rib; 2-formwork; 3-main rib; 4-top support; 5-support frame; 6-base layer; 7-internal reinforcement of base layer; 8-waterproof layer; 9-prefabricated cover plate; 10-roughening; 11-grouting pipe; 12-waterstop steel plate; 13-felt isolation layer; 14-reinforcement mesh; 15-concrete protective layer; 16-reinforcement hole; 17-pre-waterproofing layer; 18-tongue and groove; 19-rough surface; 20-caulking sealant; 21-micro-expanding fine stone concrete; 22-longitudinal stubble; 23-horizontal stubble; 24-pipe waterproofing additional layer; 25-post-poured concrete. DETAILED DESCRIPTION

[0022] The present application is further described below in conjunction with the accompanying drawings and embodiments.

[0023] Embodiment 1 This embodiment discloses a pre-sealed waterproof structure of a post-cast strip of a basement roof. Figure 6 As shown, the basement top plate in the post-cast zone area is composed of post-cast concrete 25 and precast cover plate 9 from bottom to top, and the basement top plate in the remaining area is composed of base layer 6, waterproof layer 8, linoleum isolation layer 13 and concrete protective layer 15 with embedded steel mesh 14 from bottom to top; the precast cover plate 9 is a precast part, such as Figures 1 to 3 As shown, a grouting pipe 11 for pouring into the backfill zone is provided in the middle, transverse reinforcing holes 16 are distributed on the side, a tongue-and-groove 18 with an upper vacant portion is provided at one longitudinal end, and a waterproof pre-paved layer 17 is provided on the bottom. The top of the grouting pipe 11 is higher than the height of the backfill soil, and the waterproof pre-paved layer 17 is provided with stubble at both longitudinal and transverse ends of the prefabricated cover plate 9; Figures 4 to 6 As shown, the prefabricated cover plate 9 is supported across the base layer on both sides and is tightly spliced ​​along the longitudinal direction of the post-cast strip. The waterproof layer 8 is laid on the transverse stubble 23 of the waterproof pre-laid layer 17 and then extends to the side of the prefabricated cover plate 9. The transverse steel bars connected to the steel mesh 14 are inserted into the corresponding reinforcement holes 16. The longitudinal stubble 22 at one end of the waterproof pre-laid layer 17 is attached to the front end surface and tread of its own tongue and groove 18, and the longitudinal stubble 22 at the other end is attached to the original longitudinal stubble 22 on the front end surface and tread of the adjacent tongue and groove 18 and overlapped and fixed. The gaps in the tongue and groove 18 between adjacent prefabricated cover plates 9 are sealed and filled.

[0024] Regarding the sealing and filling of the gap at the tongue and groove 18, in this embodiment, preferably: Figure 5 As shown, the gaps at the tongue and groove 18 between adjacent prefabricated cover plates 9 are sealed and filled with caulking sealant 20 and slightly expanded fine stone concrete 21, the caulking sealant 20 is located in the lower layer, and the slightly expanded fine stone concrete 21 is located in the upper layer; and in order to improve the sealing and filling effect of the gaps at the tongue and groove 18, as shown in FIG. Figure 2 and Figure 5 As shown, a rough surface 19 is provided on the riser surface of the tongue and groove 18 at one end of the prefabricated cover plate 18 and on the upper part of the other end.

[0025] Regarding the waterproofing of the grouting pipe 11, in this embodiment, preferably: Figure 3 As shown, a pipe-penetrating waterproof additional layer 24 is provided on the lower side of the waterproof pre-laid layer 17 on the bottom surface of the prefabricated cover plate 9. The pipe-penetrating waterproof additional layer 24 is annularly sleeved on the grouting pipe 11 and extends upward to the inner wall of the grouting pipe 11.

[0026] Regarding the material setting of the waterproof pre-paved layer 17, in this embodiment, preferably: the waterproof pre-paved layer 17 uses non-curing asphalt waterproof coating + SBS asphalt self-adhesive waterproof membrane, and the adjacent overlapping longitudinal stubbles 22 are fixed by heat treatment.

[0027] Regarding the material setting of the grouting pipe 11, in the present embodiment, preferably: the grouting pipe 11 adopts a PE pipe or a steel pipe. If a PE pipe is adopted, it is sealed by hot melting, and if a steel pipe is adopted, it is sealed by steel plate welding.

[0028] In this embodiment, the prefabricated cover plate 9 exceeds the post-casting strip by 200 mm to 300 mm on one side, and the lateral stubble 23 of the waterproof pre-laid layer 17 exceeds the prefabricated cover plate 9 by 200 mm to 300 mm on one side.

[0029] In this embodiment, the base layer 6 adopts a reinforced concrete structure, the prefabricated cover plate 9 adopts a reinforced concrete plate, and the post-cast concrete 25 adopts a higher grade micro-expansive concrete. The base layer sides on both sides of the post-cast strip are provided with roughening 10, the internal steel bars 7 of the base layer are connected with the internal steel bars of the post-cast concrete 25, and a water-stop steel plate 12 is provided along the line between the base layer 6 and the post-cast concrete 25.

[0030] Embodiment 2 This embodiment discloses a construction method of the above-mentioned basement top slab post-cast belt pre-sealed waterproof structure, which specifically includes the following steps: S1) Figure 4 As shown, the formwork and support of the basement roof are set up, and an independent support frame 5 is set up in the post-casting zone area. The support frame 5 in the post-casting zone area supports the formwork 2 through the top support 4, the main rib 3 and the secondary rib 4 in turn, and a cleaning port is provided on the formwork 2 in the post-casting zone area; after the formwork and support of the basement roof and the support frame 5 in the post-casting zone area are accepted and qualified, the internal steel bars 7 of the base layer are tied, and the water-stop steel plate 12 is installed, and the water-stop steel plate 12 is arranged along the central axis of the post-casting zone; then the base layer 6 concrete is poured, and after curing to the designed strength, the base layer sides on both sides of the post-casting zone are roughened 10, and the floating slurry is removed to expose the stones, and the floating soil and concrete and other impurities in the post-casting zone are cleaned out through the cleaning port and then the cleaning port is closed.

[0031] S2) Figure 4 and Figure 5 As shown, the prefabricated cover plates 9 are sequentially suspended and installed so that the prefabricated cover plates 9 are supported across the base layers 6 on both sides and are tightly spliced ​​along the longitudinal direction of the post-cast strips. The transverse stubbles 23 at both ends of the waterproof pre-paved layer 17 are spread out and laid on the base layer 6. The longitudinal stubbles 22 at one end of the waterproof pre-paved layer 17 are attached to the front end surface and tread of its own tongue and groove 18, and the longitudinal stubbles 22 at the other end are attached to the original longitudinal stubbles 22 on the front end surface and tread of the adjacent tongue and groove 18 and overlapped and fixed. The adjacent overlapping longitudinal stubbles 22 are fixed by heat treatment, and the gaps at the tongue and groove 18 between adjacent prefabricated cover plates 9 are sealed and filled with caulking sealant 20 and slightly expanded fine stone concrete 21. The caulking sealant 20 is located in the lower layer and the slightly expanded fine stone concrete 21 is located in the upper layer.

[0032] S3) Figure 6As shown, a waterproof layer 8 is constructed, and the waterproof layer 8 is extended and laid on the transverse stubble 23 of the waterproof pre-laid layer 17 and then extends to the side of the prefabricated cover plate 9.

[0033] S4) Figure 6 As shown, a water-tightness test is performed on the existing structure of the basement roof; after the test is qualified, a felt isolation layer 13 is laid on the waterproof layer 8, and then pads are distributed on the felt isolation layer 13, and steel meshes 14 are placed on the pads, so that the transverse steel bars connected to the steel meshes 14 are inserted into the corresponding reinforcement holes 16; then the concrete protection layer 15 is poured. For the sake of flatness and beauty, the concrete protection layer 15 is preferably flush with the prefabricated cover plate 9.

[0034] S5) Figure 6 As shown, the soil on the upper side of the basement top plate is backfilled and compacted layer by layer. At the same time, the post-cast strip is poured and vibrated through the grouting pipe 11 until the slurry overflows evenly from the top of the grouting pipe 11. After the pouring of the post-cast strip 11 is completed, the excess grouting pipe 11 is kicked out and the grouting pipe 11 is sealed. If the grouting pipe 11 is a PE pipe, it is sealed by hot melting. If the grouting pipe 11 is a steel pipe, it is sealed by steel plate welding.

[0035] The waterproof structure can realize the backfilling of earth and the pouring of the post-cast strip at the same time, and there is no need to wait until the post-cast concrete is cured before constructing the waterproof layer 8 and backfilling the earth, which improves the construction efficiency and site utilization rate. In addition, the waterproof layer 8 is formed in one step, which further improves the construction efficiency. The waterproof structure can ensure the waterproof effect of the basement roof. The horizontal stubbles 23 of the waterproof layer 8 and the waterproof pre-laid layer 17 overlap each other, and the longitudinal stubbles 22 of the waterproof pre-laid layer 17 not only overlap each other but also are sealed and filled with the tongue and groove 18, avoiding the leakage risk of the joints between the prefabricated cover plates 9, so that the basement roof forms an overall skin-type waterproof structure in the post-cast strip area and the remaining areas. In the waterproof structure, the prefabricated cover plate 9 is connected to the steel mesh 14 embedded in the concrete protective layer 15 by the reinforcement holes 16, which improves the overall continuity.

[0036] The embodiments described above are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

Claims

1. A pre-sealed waterproof structure of a post-cast strip of a basement roof, characterized by: The basement roof in the post-cast zone area is composed of post-cast concrete and precast cover slab from bottom to top, and the base, waterproof layer, felt isolation layer and concrete protective layer with embedded steel mesh are composed of base, waterproof layer, felt isolation layer and concrete protective layer with embedded steel mesh from bottom to top in the rest of the area; the precast cover slab is a precast part, with a grouting pipe in the middle for pouring into the post-cast zone, horizontal reinforcement holes on the side, a tongue and groove with an upper vacant part at one longitudinal end, and a waterproof pre-paved layer on the bottom. The top of the grouting pipe is higher than the height of the backfill soil, and the waterproof pre-paved layer is at both longitudinal ends of the precast cover slab. There are stubbles at both ends; the prefabricated cover plate is supported across the base layer on both sides and is tightly spliced ​​along the longitudinal direction of the post-cast strip. The waterproof layer is laid on the transverse stubble of the waterproof pre-laid layer and then extends to the side of the prefabricated cover plate. The transverse steel bars connected to the steel mesh are inserted into the corresponding reinforcement holes. The longitudinal stubble of one end of the waterproof pre-laid layer is attached to the front end face and tread of its own tongue and groove, and the longitudinal stubble at the other end is attached to the original longitudinal stubble on the front end face and tread of the adjacent tongue and groove and overlapped and fixed. The gaps in the tongue and groove between adjacent prefabricated cover plates are sealed and filled.

2. The pre-sealed waterproof structure of the post-cast strip of the basement top slab according to claim 1, characterized in that: The gaps in the tongue and groove between adjacent prefabricated cover plates are sealed and filled with caulking sealant and slightly expanded fine stone concrete, with the caulking sealant located in the lower layer and the slightly expanded fine stone concrete located in the upper layer.

3. The pre-sealed waterproof structure of the post-cast strip of the basement top slab according to claim 1, characterized in that: The tongue-and-groove kick surface at one end of the prefabricated cover plate and the upper part of the other end are both provided with a rough surface.

4. The pre-sealed waterproof structure of the post-cast strip of the basement top slab according to claim 1, characterized in that: A pipe-penetrating waterproof additional layer is arranged on the lower side of the waterproof pre-laid layer on the bottom surface of the prefabricated cover plate. The pipe-penetrating waterproof additional layer is annularly sleeved on the grouting pipe and extends upward to the inner wall of the grouting pipe.

5. The pre-sealed waterproof structure of the post-cast strip of the basement top slab according to claim 1, characterized in that: The waterproof pre-layer adopts non-curing asphalt waterproof coating + SBS asphalt self-adhesive waterproof membrane, and the adjacent overlapping longitudinal stubbles are fixed by heat treatment.

6. The pre-sealed waterproof structure of the post-cast strip of the basement top slab according to claim 1, characterized in that: The grouting pipe is made of PE pipe or steel pipe. If PE pipe is used, it is sealed by hot melt. If steel pipe is used, it is sealed by steel plate welding.

7. The pre-sealed waterproof structure of the post-cast strip of the basement top slab according to claim 1, characterized in that: The single side of the prefabricated cover slab exceeds the post-cast zone by 200mm to 300mm, and the single side lateral edge of the waterproof pre-laid layer exceeds the prefabricated cover slab by 200mm to 300mm.

8. The pre-sealed waterproof structure of the post-cast strip of the basement top slab according to claim 1, characterized in that: The base layer adopts reinforced concrete structure, the prefabricated cover plate adopts reinforced concrete slab, and the post-poured concrete adopts a higher grade micro-expansive concrete. The base layer sides on both sides of the post-poured strip are roughened, the internal steel bars of the base layer are connected with the internal steel bars of the post-poured concrete, and water-stop steel plates are provided along the line between the base layer and the post-poured concrete.

9. A construction method for a pre-sealed waterproof structure of a basement top slab post-cast strip as claimed in any one of claims 1 to 8, characterized in that: First, set up the formwork and support of the basement roof, and set up an independent support frame in the post-casting zone area, and then pour the base concrete; then hoist and install the precast cover plates in sequence, so that the precast cover plates cross the support on the base layers on both sides and are tightly spliced ​​along the longitudinal direction of the post-casting zone, and the transverse stubbles at both ends of the waterproof pre-paved layer are spread out and laid on the base layer, and the longitudinal stubbles at one end of the waterproof pre-paved layer are attached to the front end surface and tread of its own tongue and groove, and the longitudinal stubbles at the other end are attached to the original longitudinal stubbles on the front end surface and tread of the adjacent tongue and groove and overlap and fix, and the gaps in the tongue and groove between adjacent precast cover plates are sealed and filled; then construct the waterproof layer, and the waterproof layer extends It is stretched on the horizontal bends of the waterproof pre-laid layer and then extended to the side of the prefabricated cover plate; then a water-tightness test is carried out on the existing structure of the basement roof. After the test is qualified, a felt isolation layer is laid on the waterproof layer, and then a pad is set on the felt isolation layer, and a steel mesh is placed on the pad. The transverse steel bars connected to the steel mesh are inserted into the corresponding reinforcement holes, and then the concrete protective layer is poured; finally, the earth on the upper side of the basement roof is backfilled and compacted layer by layer. At the same time, the post-casting strip is poured through the grouting pipe until the slurry overflows evenly from the top of the grouting pipe. After the pouring of the post-casting strip is completed, the excess grouting pipe is removed and the grouting pipe is sealed.

10. The construction method of the pre-sealed waterproof structure of the post-cast strip of the basement top slab according to claim 9, characterized in that: The support frame of the post-cast zone area supports the formwork through the top support, main ribs and secondary ribs in sequence. The formwork is provided with a cleaning port. The impurities in the post-cast zone are cleaned out through the cleaning port and then the cleaning port is closed.

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