Advanced water stop post-cast strip structure of underground building bottom plate and construction method of advanced water stop post-cast strip structure

Abstract

The invention discloses an underground building bottom plate advanced water stop post-cast strip structure which comprises a cushion layer concrete layer, other waterproof layers are arranged on the cushion layer concrete layer, and waterproof layer protection layers are arranged on the other waterproof layers. An earthwork groove is formed in the cushion layer concrete layer, same-bottom-plate steel bar layers are arranged on the two sides of the earthwork groove, and a waterproof assembly used for preventing water is arranged between the same-bottom-plate steel bar layers. A bottom plate bottom layer steel bar layer is arranged at the upper end of the same bottom plate steel bar layer, and two mud blocking assemblies are installed on the bottom plate bottom layer steel bar layer. A post-cast strip groove is formed between the two lower fast-easy closing-in nets and the two upper fast-easy closing-in nets, and a supporting part used for supporting is arranged in the post-cast strip groove. The lower fast and easy closing-in net and the upper fast and easy closing-in net can be supported, the stability of the lower fast and easy closing-in net and the stability of the upper fast and easy closing-in net can be improved during bottom plate concrete pouring, and then the stability of the overall structure is improved.

Description

Technical Field

[0001] The invention relates to the technical field of post-cast strips, and in particular to an advanced water-stop post-cast strip structure for an underground building floor and a construction method. Background Art

[0002] Post-cast joints are a structural measure frequently used in the construction of concrete building structures to release shrinkage deformation and stress. Especially in underground projects of high-rise buildings, settlement post-cast joints are often required to be set up in order to adjust the settlement between buildings of different height differences.

[0003] Referring to the existing Chinese patent with publication number CN106869188A, a construction structure for preventing water leakage of the post-cast strip of the foundation slab is disclosed, which includes a concrete cushion layer, a waterproof additional layer and a pressure relief drainage round steel casing. A waterproof protective layer is cast above the waterproof additional layer, and an advanced water-stop post-cast strip structure is made on the waterproof protective layer. The advanced water-stop concrete surface layer is inclined to form flooding, and foundation slab steel bars are set on the advanced water-stop structure. The upper and lower parts of the pressure relief drainage round steel casing are welded to the foundation slab steel bars. Quick-closing nets are arranged on both sides of the post-cast strip of the slab, the foundation slab concrete is cast, the concrete of the post-cast strip is cast, the pressure relief drainage round steel casing is drained and pressure is relieved, and the pressure relief drainage round steel casing is sealed.

[0004] The above-mentioned anti-leakage construction structure of the post-cast strip of the foundation slab has a flashing structure at the advanced water-stopping structure, a water collection well is built at the end, and an automatic pump is installed to discharge water in time; a pressure relief drainage steel casing is welded at the post-cast strip, and the water is drained and pressure released in time when the concrete is poured, which significantly improves the pass rate of the anti-leakage construction of the post-cast strip of the foundation slab. However, the above-mentioned anti-leakage construction structure of the post-cast strip of the foundation slab still has some shortcomings, such as: when pouring the concrete of the basement slab, the concrete will squeeze the quick-and-easy closing net, causing the quick-and-easy closing net to tilt, which may cause the shape and size deviation of the concrete structure, thereby affecting the stability of the overall structure. Therefore, we need to propose an advanced water-stop post-cast strip structure and construction method for the underground building slab. Summary of the invention

[0005] The object of the present invention is to provide an advanced water-stop post-casting strip structure and a construction method for an underground building floor slab, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An advanced water-stop post-casting strip structure for an underground building floor, comprising a cushion concrete layer, on which another waterproof layer is arranged, and on which another waterproof layer is arranged a waterproof layer protective layer;

[0008] An earthwork groove is provided on the cushion concrete layer, and a bottom plate steel bar layer is provided on both sides of the earthwork groove, and a waterproof component for waterproofing is provided between the bottom plate steel bar layers;

[0009] The bottom steel bar layer of the bottom plate is provided at the upper end of the bottom steel bar layer, and two mud retaining assemblies are installed on the bottom steel bar layer of the bottom plate, and the two mud retaining assemblies include a lower quick-and-easy closing net, a water stop plate and an upper quick-and-easy closing net, the lower quick-and-easy closing net is connected to the bottom steel bar layer of the bottom plate, the water stop plate is connected between the lower quick-and-easy closing net and the upper quick-and-easy closing net, and the other end of the upper quick-and-easy closing net is connected to the bottom steel bar layer of the surface layer;

[0010] A post-casting belt groove is formed between the two lower quick-and-easy closing nets and the two upper quick-and-easy closing nets, and a supporting part for supporting is arranged in the post-casting belt groove.

[0011] Preferably, the waterproof component includes two extruded plates and a water-swellable waterstop strip, and the water-swellable waterstop strip is arranged between the two extruded plates.

[0012] Preferably, an external waterstop is provided on the waterproof layer protection layer, and the external waterstop is arranged at the lower end of the waterproof component.

[0013] Preferably, the lower quick-closing net is connected between the bottom steel bar layer of the base plate and the water stop plate through the lower positioning steel bars, and the upper quick-closing net is connected between the surface steel bar layer of the base plate and the water stop plate through the upper positioning steel bars.

[0014] Preferably, an additional waterproof layer is provided at the earth trench of the cushion concrete layer, and the additional waterproof layer is arranged between other waterproof layers and the cushion concrete layer.

[0015] Preferably, a waterproof coiled material layer is provided on the upper end of the steel bar layer of the bottom plate, and the waterproof coiled material layer is arranged between the bottom steel bar layers of the bottom plate of the waterproof component.

[0016] Preferably, a cover plate for shielding is placed on the post-cast strip groove, and support sealing plates are provided at both ends of the cover plate, and the support sealing plates are placed on both sides of the post-cast strip groove.

[0017] Preferably, the support portion includes a plurality of support steel bars for supporting, and the plurality of support steel bars are welded between the water stop plates.

[0018] Preferably, the support portion includes a first support block, a second support block, three adjusting members, two side plates and a back plate, the first support block is connected to the lower end of the second support block, two adjusting members are arranged on both sides of the first support block, and another adjusting member is arranged at the other end of the second support block, and the three adjusting members all include a rotating rod and a connecting rod, both ends of the rotating rod are connected between the connecting rod and the first support block and the second support block through a threaded rod, the connecting rod is respectively connected to the two side plates and the back plate, and a telescopic rod is connected between the two ends of the two side plates.

[0019] A construction method for an advanced water-stop post-casting strip structure of an underground building floor, comprising the following steps:

[0020] S1. Construction preparation: The position of the post-casting strip before construction and the width of the additional slab strip should meet the design requirements. The earthwork trench is excavated, and then a cleaning pit is set up. The cushion concrete layer is constructed, and an additional waterproof layer is laid in the earthwork trench. Then, other waterproof layers are laid on the additional waterproof layer and the cushion concrete layer, and a waterproof layer protective layer is laid on the other waterproof layers.

[0021] S2. Earthwork trench construction: lay an external waterstop on the waterproof protective layer, then set the same bottom plate steel bar layer on both sides of the earthwork trench, install two extruded boards and water-swelling waterstop strips between the same bottom plate steel bar layers, two extruded boards and water-swelling waterstop strips are set on the external waterstop, and then pour concrete for the earthwork trench.

[0022] S3. Install mud guard assembly: when the concrete in the earthwork trough is dry, tie up the bottom steel bar layer of the bottom plate, then weld a number of lower positioning steel bars to the upper end of the earthwork trough filled with concrete and the bottom steel bar layer of the bottom plate, connect the lower quick-closing net with the several lower positioning steel bars, form a post-casting belt groove between the two lower quick-closing nets, weld the water stop plate to the lower quick-closing net, then weld a number of upper positioning steel bars at the other end of the water stop plate, then connect the upper quick-closing net with the several upper positioning steel bars, and install the bottom plate surface steel bar layer at the other end of the upper quick-closing net.

[0023] S4. Pouring of bottom slab concrete: Before pouring the bottom slab concrete, the support part is installed in the post-cast strip groove. Several supporting steel bars can be welded between the water stop plates, or the support part can be used for supporting connection. Then the bottom slab concrete is poured. After pouring, a water pit is reserved in the post-cast strip groove so that the accumulated water can be pumped out with a submersible pump. Then the post-cast strip groove is covered with a cover plate. The support cover plate is in contact with the poured bottom slab concrete to complete the sealing of the post-cast strip groove.

[0024] S5. Pouring of concrete for the post-cast strip: remove the cover plate, roughen and clean both sides of the post-cast strip groove, and then pour the post-cast strip groove. The concrete used for pouring is one grade higher than the base concrete. After the pouring is completed, cover it within 12 hours to keep it moisturized.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention can improve the waterproof effect of the post-casting zone by setting the waterproof component, and by setting the steel bar layer on the bottom plate, it not only enhances the structural stability, but also significantly improves the load-bearing and supporting capacity during the pouring process.

[0027] 2. The present invention can shield the bottom slab concrete pouring through the lower quick-closing net and the upper quick-closing net to ensure uniform filling of concrete and structural integrity, wherein the water stop plate can effectively prevent moisture from penetrating into the interior of the building, thereby preventing the foundation from sinking or deforming due to moisture erosion.

[0028] 3. The present invention can support the lower quick-closing net and the upper quick-closing net by setting the support part, and can improve the stability of the lower quick-closing net and the upper quick-closing net when pouring the bottom slab concrete, thereby improving the stability of the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure after pouring of the present invention;

[0030] Figure 2 It is a schematic structural diagram of another embodiment of the present invention;

[0031] Figure 3 It is a schematic diagram of the structure before pouring of the present invention;

[0032] Figure 4 It is a schematic diagram of the support structure of the present invention;

[0033] Figure 5 It is a schematic cross-sectional view of the support structure of the present invention.

[0034] In the figure: 1. cushion concrete layer; 2. other waterproof layers; 3. waterproof layer protection layer; 4. earthwork trough; 5. same bottom plate steel bar layer; 6. bottom plate bottom steel bar layer; 7. lower quick-closing net; 8. water-stop plate; 9. upper quick-closing net; 10. bottom plate surface steel bar layer; 11. pouring strip trough; 12. extruded board; 13. water-swelling waterstop strip; 14. external waterstop strip; 15. lower positioning steel bar; 16. upper positioning steel bar; 17. additional waterproof layer; 18. waterproof membrane layer; 19. cover plate; 20. support cover plate; 21. support steel bar; 22. first support block; 23. second support block; 24. side plate; 25. abutment plate; 26. rotating rod; 27. threaded rod; 28. connecting rod; 29. ​​telescopic rod. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Embodiment 1:

[0037] See also Figure 1 , Figure 3 , Figure 4 and Figure 5 , the present invention provides a technical solution:

[0038] An advanced water-stop post-casting strip structure for an underground building floor comprises a cushion concrete layer 1, on which is arranged another waterproof layer 2, on which is arranged another waterproof layer protection layer 3, and at which is arranged an additional waterproof layer 17 at an earthwork groove 4 of the cushion concrete layer 1, and the additional waterproof layer 17 is arranged between the other waterproof layer 2 and the cushion concrete layer 1;

[0039] The other waterproof layers 2 can prevent harmful cracks that may be caused by uneven temperature, shrinkage or settlement of the cast-in-place reinforced concrete structure. The waterproof effect can be further improved by providing an additional waterproof layer 17 and a waterproof layer protection layer 3.

[0040] An earthwork groove 4 is provided on the cushion concrete layer 1, and a bottom plate steel bar layer 5 is provided on both sides of the earthwork groove 4. A waterproof component for waterproofing is provided between the bottom plate steel bar layer 5. The waterproof component includes two extruded plates 12 and a water-swelling waterstop strip 13. The water-swelling waterstop strip 13 is arranged between the two extruded plates 12. An external waterstop strip 14 is provided on the waterproof layer protection layer 3. The external waterstop strip 14 is arranged at the lower end of the waterproof component;

[0041] By setting the same steel bar layer 5 as the bottom plate, not only the structural stability is enhanced, but also the load-bearing and supporting capacity during the pouring process is significantly improved. The extruded board 12 has the effects of moisture-proofing and heat-insulating, controlling ground frost heave, heat insulation and moisture-proofing. The water-expandable waterstop strip 13 expands and deforms 2-3 times when it comes into contact with water, and fills all irregular surfaces, holes and gaps in the joints, while generating huge contact pressure, which completely prevents leakage and improves the waterproof effect.

[0042] A bottom steel bar layer 6 is provided at the upper end of the bottom steel bar layer 5, and two mud retaining assemblies are installed on the bottom steel bar layer 6 of the bottom plate. The two mud retaining assemblies include a lower quick-and-easy closing net 7, a water stop plate 8 and an upper quick-and-easy closing net 9. The lower quick-and-easy closing net 7 is connected to the bottom steel bar layer 6 of the bottom plate, the water stop plate 8 is connected between the lower quick-and-easy closing net 7 and the upper quick-and-easy closing net 9, and the other end of the upper quick-and-easy closing net 9 is connected to the bottom plate surface steel bar layer 10;

[0043] The lower quick-closing net 7 and the upper quick-closing net 9 can shield the bottom slab concrete pouring to ensure uniform filling of concrete and structural integrity, wherein the water stop plate 8 can effectively prevent moisture from penetrating into the building, thereby preventing the foundation from sinking or deforming due to moisture erosion.

[0044] Furthermore, a waterproof coiled material layer 18 is provided on the upper end of the bottom plate steel bar layer 5, and the waterproof coiled material layer 18 is arranged between the bottom steel bar layers 6 of the bottom plate of the waterproof component.

[0045] The waterproofing membrane layer 18 can effectively enhance the waterproofing ability of the post-casting groove 11 and the main structure, greatly improving the anti-leakage and anti-seepage performance of the entire building structure.

[0046] Based on the above embodiment, the lower quick-closing net 7 is connected between the bottom steel bar layer 6 of the bottom plate and the water stop plate 8 through the lower positioning steel bars 15, and the upper quick-closing net 9 is connected between the surface steel bar layer 10 of the bottom plate and the water stop plate 8 through the upper positioning steel bars 16.

[0047] The lower positioning steel bars 15 and the upper positioning steel bars 16 can support and strengthen the lower quick-and-easy closing net 7 and the upper quick-and-easy closing net 9 .

[0048] A post-cast strip groove 11 is formed between the two lower quick-closing nets 7 and the two upper quick-closing nets 9. A supporting portion is provided in the post-cast strip groove 11. The supporting portion includes a plurality of supporting steel bars 21 for supporting. The plurality of supporting steel bars 21 are welded between the water stop plates 8. A cover plate 19 for shielding is placed on the post-cast strip groove 11. Support sealing plates 20 are provided at both ends of the cover plate 19. The support sealing plates 20 are placed on both sides of the post-cast strip groove 11.

[0049] A plurality of supporting steel bars 21 can support the lower quick-closing net 7 and the upper quick-closing net 9, and can prevent the lower quick-closing net 7 and the upper quick-closing net 9 from tilting when pouring the bottom slab concrete, thereby improving the stability of the lower quick-closing net 7 and the upper quick-closing net 9, and thus improving the stability of the overall structure;

[0050] The cover plate 19 is provided to shield the post-cast strip groove 11 and prevent debris from entering the post-cast strip groove 11 .

[0051] Embodiment 2:

[0052] See also Figure 2 The difference between this embodiment 2 and embodiment 1 is that the supporting method of the supporting part is different:

[0053] The supporting part includes a first supporting block 22, a second supporting block 23, three adjusting members, two side plates 24 and abutment plate 25. The first supporting block 22 is connected to the lower end of the second supporting block 23. Two adjusting members are arranged on both sides of the first supporting block 22, and another adjusting member is arranged at the other end of the second supporting block 23. The three adjusting members all include a rotating rod 26 and a connecting rod 28. The two ends of the rotating rod 26 are connected between the connecting rod 28 and the first supporting block 22 and the second supporting block 23 through a threaded rod 27. The connecting rod 28 is respectively connected to the two side plates 24 and the abutment plate 25, and a telescopic rod 29 is connected between the two ends of the two side plates 24.

[0054] When supporting the upper quick-and-easy closing nets 9, the rotating rod 26 is adjusted according to the distance between the two upper quick-and-easy closing nets 9 and the depth of the post-casting groove. Rotating the rotating rod 26 can drive the threaded rods 27 at both ends to rotate. The threaded rod 27 is threadedly connected to the first support block 22, the second support block 23 and one end of the connecting rod 28, thereby driving the connecting rod 28 to move, thereby adjusting the distance between the first support block 22, the second support block 23 and the connecting rod 28, and adjusting the two side plates 24 to contact and connect with the upper quick-and-easy closing nets 9, and the abutment plate 25 to contact and connect with the lower end of the post-casting belt groove 11, thereby supporting the upper quick-and-easy closing nets 9. After the bottom plate concrete is poured, the support part can be disassembled to achieve recycling.

[0055] Embodiment 3:

[0056] The difference between this embodiment 3 and the embodiments 1 and 2 is that: this embodiment also provides a construction method of an advanced water-stop post-casting strip structure of an underground building floor, including the following method steps:

[0057] S1. Construction preparation: The position of the post-casting strip before construction and the width of the additional slab strip should meet the design requirements. The earthwork trench is excavated, and then a cleaning pit is set up. The cushion concrete layer is constructed, and an additional waterproof layer is laid in the earthwork trench. Then, other waterproof layers are laid on the additional waterproof layer and the cushion concrete layer, and a waterproof layer protective layer is laid on the other waterproof layers.

[0058] S2. Earthwork trench construction: lay an external waterstop on the waterproof layer protection layer, then set the same bottom plate steel bar layer on both sides of the earthwork trench, two extruded boards and water-swelling waterstop strips are installed between the same bottom plate steel bar layer, two extruded boards and water-swelling waterstop strips are set on the external waterstop, and then the earthwork trench 4 is poured with concrete.

[0059] S3. Install mud guard assembly: when the concrete in the earthwork trough is dry, tie up the bottom steel bar layer of the bottom plate, then weld a number of lower positioning steel bars to the upper end of the earthwork trough filled with concrete and the bottom steel bar layer of the bottom plate, connect the lower quick-closing net with the several lower positioning steel bars, form a post-casting belt groove between the two lower quick-closing nets, weld the water stop plate to the lower quick-closing net, then weld a number of upper positioning steel bars at the other end of the water stop plate, then connect the upper quick-closing net with the several upper positioning steel bars, and install the bottom plate surface steel bar layer at the other end of the upper quick-closing net.

[0060] S4. Pouring of bottom slab concrete: Before pouring the bottom slab concrete, the support part is installed in the post-cast strip groove. Several supporting steel bars can be welded between the water stop plates, or the support part can be used for supporting connection. Then the bottom slab concrete is poured. After pouring, a water pit is reserved in the post-cast strip groove so that the accumulated water can be pumped out with a submersible pump. Then the post-cast strip groove is covered with a cover plate. The support cover plate is in contact with the poured bottom slab concrete to complete the sealing of the post-cast strip groove.

[0061] S5. Pouring of concrete for the post-cast strip: remove the cover plate, roughen and clean both sides of the post-cast strip groove, and then pour the post-cast strip groove. The concrete used for pouring is one grade higher than the base concrete. After the pouring is completed, cover it within 12 hours to keep it moisturized.

[0062] Working principle: an additional waterproof layer 17 is laid at the earthwork trough 4, and then other waterproof layers 2 are laid on the additional waterproof layer 17 and the cushion concrete layer 1, and a waterproof layer protective layer 3 is laid on the other waterproof layer 2, and then an external water stop strip 14 is laid on the waterproof layer protective layer 3, which can improve the waterproof effect of the post-casting strip, and then the same bottom plate steel bar layer 5 is set on both sides of the earthwork trough 4, and two extruded boards 12 and water-expanding water stop strips 13 are installed between the same bottom plate steel bar layer 5, which enhances the structural stability and the waterproofness of the post-casting strip;

[0063] The bottom steel bar layer 6 of the bottom plate is bundled for construction, and then a number of lower positioning steel bars 15 are welded to the upper end of the earthwork groove 4 after being filled with concrete and the bottom steel bar layer 6 of the bottom plate, and the lower quick-and-easy closing net 7 is connected with the lower positioning steel bars 15, and a post-casting belt groove 11 is formed between the two lower quick-and-easy closing nets 7, and the water stop plate 8 is welded to the lower quick-and-easy closing net 7, and then a number of upper positioning steel bars 16 are welded at the other end of the water stop plate 8, and then the upper quick-and-easy closing net 9 is connected with the upper positioning steel bars 16, and the bottom plate surface steel bar layer 10 is installed at the other end of the upper quick-and-easy closing net 9, so as to facilitate the isolation during the bottom layer pouring, and then the bottom plate concrete is poured, and after the pouring is completed, the blocking cover is covered on the post-casting belt groove 11 to prevent debris from entering the post-casting belt groove 11;

[0064] Then, the cover plate 19 is removed and the post-casting groove 11 is cast.

[0065] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An advanced water-stop post-casting strip structure for an underground building floor, comprising a cushion concrete layer (1), characterized in that: A further waterproof layer (2) is provided on the cushion concrete layer (1), and a waterproof layer protection layer (3) is provided on the further waterproof layer (2); An earthwork trough (4) is provided on the cushion concrete layer (1), and bottom plate steel reinforcement layers (5) are provided on both sides of the earthwork trough (4), and a waterproofing component for waterproofing is provided between the bottom plate steel reinforcement layers (5); A bottom plate bottom steel bar layer (6) is provided at the upper end of the bottom plate steel bar layer (5), and two mud retaining assemblies are installed on the bottom plate bottom steel bar layer (6), and the two mud retaining assemblies include a lower quick-closing net (7), a water stop plate (8) and an upper quick-closing net (9), the lower quick-closing net (7) is connected to the bottom plate bottom steel bar layer (6), the water stop plate (8) is connected between the lower quick-closing net (7) and the upper quick-closing net (9), and the other end of the upper quick-closing net (9) is connected to the bottom plate surface steel bar layer (10); A post-casting belt groove (11) is formed between the two lower quick-closing nets (7) and the two upper quick-closing nets (9), and a support portion for supporting is provided in the post-casting belt groove (11).

2. The advanced water-stop post-casting strip structure of the underground building floor according to claim 1 is characterized in that: The waterproof component comprises two extruded plates (12) and a water-swelling water-stop strip (13), wherein the water-swelling water-stop strip (13) is arranged between the two extruded plates (12).

3. The advanced water-stop post-casting strip structure of the underground building floor according to claim 1 is characterized in that: An external waterstop (14) is provided on the waterproof layer protection layer (3), and the external waterstop (14) is arranged at the lower end of the waterproof component.

4. The structure and construction method of the underground building floor advanced water-stop post-casting strip according to claim 1, characterized in that: The lower quick-closing net (7) is connected between the bottom steel bar layer (6) of the bottom plate and the water stop plate (8) via the lower positioning steel bars (15), and the upper quick-closing net (9) is connected between the surface steel bar layer (10) of the bottom plate and the water stop plate (8) via the upper positioning steel bars (16).

5. The underground building floor advanced water-stop post-casting strip structure according to claim 1, characterized in that: An additional waterproof layer (17) is provided at the earthwork trench (4) of the cushion concrete layer (1), and the additional waterproof layer (17) is arranged between other waterproof layers (2) and the cushion concrete layer (1).

6. The underground building floor advanced water-stop post-casting strip structure according to claim 1, characterized in that: A waterproof coiled material layer (18) is provided at the upper end of the bottom plate steel bar layer (5), and the waterproof coiled material layer (18) is arranged between the bottom steel bar layers (6) of the bottom plate of the waterproof component.

7. The advanced water-stop post-casting strip structure of the underground building floor according to claim 1 is characterized in that: A cover plate (19) for shielding is placed on the post-casting strip groove (11), and support sealing plates (20) are provided at both ends of the cover plate (19), and the support sealing plates (20) are placed on both sides of the post-casting strip groove (11).

8. The underground building floor advanced water-stop post-casting strip structure according to claim 1, characterized in that: The support portion comprises a plurality of support steel bars (21) for supporting, and the plurality of support steel bars (21) are welded between the water stop plates (8).

9. The advanced water-stop post-casting strip structure of the underground building floor according to claim 1, characterized in that: The support portion comprises a first support block (22), a second support block (23), three adjustment members, two side plates (24) and abutment plate (25); the first support block (22) is connected to the lower end of the second support block (23); two adjustment members are arranged on both sides of the first support block (22); another adjustment member is arranged at the other end of the second support block (23); the three adjustment members all comprise a rotating rod (26) and a connecting rod (28); two ends of the rotating rod (26) are connected between the connecting rod (28) and the first support block (22) and the second support block (23) through a threaded rod (27); the connecting rod (28) is respectively connected to the two side plates (24) and the abutment plate (25); and a telescopic rod (29) is connected between the two ends of the two side plates (24).

10. A construction method for an advanced water-stop post-casting strip structure of an underground building floor, characterized in that: The method comprises the following steps: S1. Construction preparation: The position of the post-casting strip before construction and the width of the additional slab strip should meet the design requirements. The earthwork trench is excavated, and then a cleaning pit is set up. The cushion concrete layer is constructed, and an additional waterproof layer is laid in the earthwork trench. Then, other waterproof layers are laid on the additional waterproof layer and the cushion concrete layer, and a waterproof layer protective layer is laid on the other waterproof layers. S2. Earthwork trench construction: lay an external waterstop on the waterproof protective layer, then set the same bottom plate steel bar layer on both sides of the earthwork trench, install two extruded boards and water-swelling waterstop strips between the same bottom plate steel bar layers, two extruded boards and water-swelling waterstop strips are set on the external waterstop, and then pour concrete for the earthwork trench. S3. Install mud guard assembly: when the concrete in the earthwork trough is dry, tie up the bottom steel bar layer of the bottom plate, then weld a number of lower positioning steel bars to the upper end of the earthwork trough filled with concrete and the bottom steel bar layer of the bottom plate, connect the lower quick-closing net with the several lower positioning steel bars, form a post-casting belt groove between the two lower quick-closing nets, weld the water stop plate to the lower quick-closing net, then weld a number of upper positioning steel bars at the other end of the water stop plate, then connect the upper quick-closing net with the several upper positioning steel bars, and install the bottom plate surface steel bar layer at the other end of the upper quick-closing net. S4. Pouring of bottom slab concrete: Before pouring the bottom slab concrete, the support part is installed in the post-cast strip groove. Several supporting steel bars can be welded between the water stop plates, or the support part can be used for supporting connection. Then the bottom slab concrete is poured. After pouring, a water pit is reserved in the post-cast strip groove so that the accumulated water can be pumped out with a submersible pump. Then the post-cast strip groove is covered with a cover plate. The support cover plate is in contact with the poured bottom slab concrete to complete the sealing of the post-cast strip groove. S5. Pouring of concrete for the post-cast strip: remove the cover plate, roughen and clean both sides of the post-cast strip groove, and then pour the post-cast strip groove. The concrete used for pouring is one grade higher than the base concrete. After the pouring is completed, cover it within 12 hours to keep it moisturized.

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