Basement bottom plate post-cast strip waterproof construction method and structure

Abstract

The invention discloses a basement bottom plate post-cast strip waterproof construction method and structure. The method comprises the steps that a basement bottom plate foundation and a post-cast strip downwards-concave foundation are excavated; concrete cushion layer pouring is conducted, and a basement bottom plate concrete cushion layer and a post-cast strip downward-concave type deformation buffer strip are formed; the basement bottom plate concrete cushion layer is subjected to surface treatment, so that the basement bottom plate concrete cushion layer is kept flat and dry; waterproof construction is conducted on the basement bottom plate concrete cushion layer and the surface layer of the post-pouring cushion layer; reinforcing steel bars of a basement bottom plate and a post-cast strip are bound, and meanwhile a water stop strip steel plate is installed; a basement bottom plate is poured, and then concrete curing is conducted; an advanced water stop structure is arranged at the intersection of the post-cast strip pouring cavity and the post-cast strip; an advanced water stop structure is arranged at the intersection of the post-cast strip pouring cavity and the post-cast strip; concrete structures on the two sides of the post-cast strip are subjected to roughening treatment and coated with a cement-based permeable crystallization type waterproof coating, and concrete pouring forming is adopted. According to the construction method, water accumulation at the bottom of the post-cast strip and cracking of the structure are avoided.

Description

Technical Field

[0001] This invention belongs to the field of post-pouring strip construction technology, and more specifically, relates to a waterproof construction method and structure for post-pouring strips in basement floor slabs. Background Technology

[0002] The complexity of basement waterproofing is determined by the structure and use of the basement, and how to do a good job of basement waterproofing is a very important issue. Since the basement cannot be exposed to sunlight, the walls will become damp and peel off, and the ground moisture will not evaporate easily. The building structure of the basement affects the waterproofing effect. In particular, the waterproofing of the post-pouring strip of the foundation slab has always been a difficult problem in the construction of basement waterproofing. The main reasons are as follows: (1) It is difficult to clean the water accumulated in the post-pouring strip of the foundation slab. The concrete of the post-pouring strip is diluted by the water during the pouring process, and the self-waterproofing performance of the concrete is lost; (2) The pre-water-stopping structure of the foundation slab of the post-pouring strip is unreasonable. Affected by the erosion of the water accumulated in the post-pouring strip, the durability of the waterproofing layer is weakened and the finished product is damaged; (3) The structural deformation in the post-pouring strip is large. Affected by the structural deformation, the waterproofing structure of the post-pouring strip cracks and is damaged.

[0003] To address the above problems, this invention proposes a waterproofing construction method for post-pouring strips in basement slabs. This method can prevent water accumulation at the bottom of the post-pouring strip, effectively prevent structural cracking and damage, avoid erosion of the pre-sealed structure, and improve the waterproofing durability of the post-pouring strip. Summary of the Invention

[0004] In view of the problems of water accumulation at the bottom of the post-pouring strip in the existing technology, structural cracking and damage, and unreasonable pre-water-stopping construction, the present invention provides a waterproof construction method for the post-pouring strip of the basement floor slab to solve these problems.

[0005] To achieve the above objectives, the present invention provides a method for waterproofing the post-pouring strip of a basement floor slab, comprising the following steps:

[0006] S100: Excavation of the basement foundation and the recessed foundation with post-cast strip;

[0007] S200: Concrete cushion layer is poured to form the concrete cushion layer of the basement floor and the concave deformation buffer zone of the post-cast strip.

[0008] S300: Surface treatment of the concrete foundation layer of the basement slab to keep it flat and dry;

[0009] S400: Waterproofing construction is carried out on the surface of the concrete cushion layer of the basement floor and the concave deformation buffer zone of the post-cast strip.

[0010] S500: Carry out the reinforcement binding work for the basement floor slab and post-cast strip, and at the same time install the waterstop steel plate 12;

[0011] S600: Pour the basement floor slab and then cure the concrete.

[0012] S700: An advanced water-stopping structure is installed in the casting cavity of the post-cast strip and at the intersection of the post-cast strip;

[0013] S800: The concrete structure on both sides of the post-cast strip is roughened and coated with cement-based penetrating crystalline waterproof coating, and then cast into shape using concrete.

[0014] Furthermore, the construction process in step S400 includes the following steps:

[0015] S401: Apply non-curing asphalt waterproof coating to the inside and outside corners of the concrete cushion layer and the concave deformation buffer zone of the post-cast strip of the basement floor to form a non-curing asphalt waterproof coating layer.

[0016] S402: Lay out SBS bitumen pre-laid reverse-adhesive waterproof membrane;

[0017] S403: An external rubber waterstop is installed at the bottom of the groove of the concave deformation buffer strip.

[0018] Furthermore, the construction process in step S600 includes the following steps:

[0019] S601: Clean the debris and water in the concave deformation buffer zone of the post-cast strip again;

[0020] S602: Formwork is provided at the concave deformation buffer zone of the post-pouring strip to leave the post-pouring strip pouring cavity and an expansion joint located at the center of the bottom of the post-pouring strip pouring cavity; the post-pouring strip pouring cavity is provided with a slope that gradually decreases in height from the outer end to the intersection of the post-pouring strip.

[0021] S603: A water pump placement cavity is partitioned off at the bottom of the intersection of the post-pouring strip using a template. This water pump placement cavity is the lowest point inside the post-pouring strip.

[0022] S604: Tie and fix the water pump pipe to the steel bar, and seal the bottom pipe opening and fit it against the outside of the water pump placement cavity template.

[0023] S605: When pouring concrete, mechanical vibration is used; the concrete slump is controlled at 160-180mm. Mechanical vibration is used, and the vibration time is based on the concrete surface becoming smooth, no more air bubbles appearing, and no more settling. Avoid the vibrator touching the waterstop and formwork.

[0024] S606: After the concrete is poured, smooth the surface with a wooden trowel in time. After the concrete has initially set, remove the formwork and smooth it with an iron trowel. The allowable deviation of the surface flatness is ±3mm; complete the pouring of the basement floor slab.

[0025] Furthermore, the construction process in step S700 includes the following steps:

[0026] S701: Extruded polystyrene boards shall be used to fill expansion joints;

[0027] S702: After completing the caulking work, seal the top of the expansion joint with polysulfide sealant.

[0028] Furthermore, the construction process in step S200 includes the following steps:

[0029] S201: 100mm C20 fine aggregate concrete is used to pour the foundation of the basement floor slab and the recessed foundation of the post-cast strip;

[0030] S202: After pouring, perform a second surface finishing and smoothing;

[0031] S203: Water curing until design strength is reached;

[0032] After the top of the post-cast strip recessed foundation is poured, it is smoothed and polished to form a post-cast strip recessed deformation buffer zone. This post-cast strip recessed deformation buffer zone has a concave structure, with a groove-like structure at the bottom center. The shoulders of the groove on both sides are connected to the concrete cushion layer of the basement floor through a gentle slope.

[0033] Furthermore, the construction process in step S700 includes the following steps:

[0034] S501: Bind the reinforcement bars of the basement floor slab and post-cast strip;

[0035] S502: Accurately place the waterstop steel plate in the design position and fix it to the steel bar with steel bar clips or wire, with a spacing of ≤500mm;

[0036] In step S502, a suitable standardized waterstop steel plate is used at the corner of the post-cast strip. The contact parts of the overlapping waterstop steel plates should be fully welded on both sides, and the weld slag should be cleaned.

[0037] Furthermore, the construction process in step S800 includes the following steps:

[0038] S801: Install a submersible pump and connect its output end to the pre-buried water pump pipe;

[0039] S802: Roughen the sides of the post-cast strip pouring cavity;

[0040] S803: Remove the laitance and loose stones from the surface of the post-cast strip pouring cavity structure, clean the area around the steel plate waterstop, and use a high-pressure water gun to rinse. The rinsed water and impurities are collected at the intersection of the post-cast strip through the slope structure of the post-cast strip.

[0041] S804: Impurities are cleaned manually, and wastewater is pumped out using a submersible pump;

[0042] S805: After drying, spray cement-based penetrating crystalline waterproof coating around the bottom of the casting cavity of the post-cast strip;

[0043] S806: High-grade micro-expansion impermeable concrete is used for pouring to form a post-pouring strip layer of 20.

[0044] Further, when performing the construction step S802, the following steps are included: roughening the pouring cavity of the post-pouring strip using a retarding method, delaying the setting time of the concrete surface slurry by spraying a concrete surface retarder on the inside of the template in advance, and removing the loose slurry on the surface with a high-pressure water gun or brush tool after the surrounding concrete has reached a certain strength, forming a rough surface post-pouring strip chiseled part.

[0045] Furthermore, during the construction of step S804, the submersible pump is wrapped with a filter cloth to prevent clogging of the pump body; the water pump pipe pumps the accumulated water into the dewatering well, and the pneumatic dewatering equipment pumps the water out of the dewatering well through the external drainage pump and sends it to the sedimentation tank for secondary use.

[0046] According to another aspect of the present invention, a waterproof structure for a post-cast strip in a basement floor slab is also provided, comprising: a recessed foundation for the post-cast strip, the top of which is provided with a recessed deformation buffer strip; the recessed deformation buffer strip is a concave structure, with a groove-like structure at the bottom center, and the shoulders of the groove on both sides connecting to the concrete cushion layer of the basement floor slab via gentle slopes; a non-curing asphalt waterproof coating layer and an SBS asphalt pre-laid reverse-adhesive waterproof membrane sequentially disposed on the top of the recessed deformation buffer strip, and rubber waterstops attached inside and outside the groove; and a post-cast strip pouring cavity located on the basement floor slab. The post-cast strip pouring cavity has a slope that gradually decreases in height from the outer end to the intersection of the post-cast strips; a water pump placement cavity is provided at the bottom of the intersection of the post-cast strips; an expansion joint is provided at the center of the bottom of the post-cast strip pouring cavity, and an extruded polystyrene board is provided in the expansion joint. The bottom of the extruded polystyrene board abuts against the external rubber waterstop, and a polysulfide sealant layer is provided on the top for filling the joint; post-cast strip chisel sections are located on both sides of the post-cast strip pouring cavity, and a layer of cement-based penetrating crystalline waterproof coating is provided on them; and a post-cast strip pouring layer is formed by pouring micro-expansion high-grade impermeable concrete into the post-cast strip pouring cavity.

[0047] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects:

[0048] 1. The waterproof construction method for post-pouring strips of the present invention involves setting an external rubber waterstop at the bottom of the groove of the concave deformation buffer strip 6, setting an advanced waterstop structure at the pouring cavity and intersection of the post-pouring strip, filling the expansion joint with extruded polystyrene board, and sealing the top of the expansion joint with polysulfide sealant. This method prevents rainwater and cleaning water from eroding the advanced waterstop structure and improves the waterproof durability of the post-pouring strip.

[0049] 2. The waterproof construction method for post-pouring strips of the present invention involves providing a slope in the post-pouring strip pouring cavity that gradually decreases in height from the outer end to the intersection of the post-pouring strips, and using a template to partition a water pump placement cavity at the bottom of the intersection of the post-pouring strips. This water pump placement cavity is the lowest point inside the post-pouring strip, thereby utilizing the height difference to concentrate the wastewater used in the pouring process into the water pump placement cavity. A submersible pump connected to the water pump placement cavity through a pre-embedded water pump pipe facilitates the pumping of accumulated water in the intersection of the post-pouring strips to the dewatering well. This ensures that the interior of the post-pouring strip is dry and free of water accumulation, avoids corrosion of the post-pouring strip reinforcement, reduces the need for rust prevention treatment of the post-pouring strip reinforcement, ensures the quality of the reinforcement in the post-pouring strip, and saves on reinforcement maintenance costs.

[0050] 3. The post-pouring strip waterproofing construction method of the present invention improves the waterproofing performance of the post-pouring strip by setting an external rubber waterstop at the bottom of the groove of the concave deformation buffer strip.

[0051] 4. The waterproof construction method for post-pouring strips of the present invention uses a slow-setting method to roughen the pouring cavity of the post-pouring strip, avoiding interference from the reinforcing steel bars and increasing the difficulty of the operation; by setting a slope in the pouring cavity of the post-pouring strip with a gradually decreasing height from the outer end to the intersection of the post-pouring strip, and using a high-pressure water gun to clean the post-pouring strip, impurities can be quickly concentrated in the water pump placement cavity at the lowest point inside the post-pouring strip. Wastewater is automatically collected through the height difference, and the operators only need to remove the impurities at the water pump placement cavity, which greatly reduces the difficulty of manual cleaning. When the post-pouring strip is poured, there are no impurities or water accumulation in the base layer, ensuring the self-waterproof performance of the post-pouring strip. Attached Figure Description

[0052] Figure 1 This is a schematic diagram of the excavation of the basement foundation and post-cast strip foundation in an embodiment of the present invention;

[0053] Figure 2 This is a schematic diagram of the waterproof construction structure of the concrete cushion layer and the concave deformation buffer zone of the post-cast strip in the basement floor slab of the present invention.

[0054] Figure 3 This is a schematic diagram of the pre-water-stopping structure of the post-cast strip in an embodiment of the present invention;

[0055] Figure 4 This is a schematic diagram of the advanced water-stopping structure at the intersection of the post-cast strip in an embodiment of the present invention;

[0056] Figure 5 This is a schematic diagram of the structure of chiseling the intersection of the post-cast strip and installing the submersible pump in an embodiment of the present invention;

[0057] Figure 6 This is a schematic diagram of the post-cast strip chiseling operation in an embodiment of the present invention;

[0058] Figure 7 This is a schematic diagram of the structure of the post-cast strip pouring layer in an embodiment of the present invention;

[0059] Figure 8 This is a schematic diagram of the casting structure at the intersection of the post-cast strips in an embodiment of the present invention;

[0060] Figure 9 This is a schematic diagram of the planar structure of the post-cast strip in an embodiment of the present invention;

[0061] Figure 10 This is a flowchart illustrating a method for waterproofing a basement floor slab with a post-pouring strip, as described in an embodiment of the present invention.

[0062] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1-basement floor foundation, 2-recessed foundation of post-cast strip, 3-concrete pad layer of basement floor, 4-non-curing asphalt waterproof coating layer, 5-SBS asphalt pre-laid reverse-adhesive waterproof membrane, 6-recessed deformation buffer strip of post-cast strip, 7-external rubber waterstop, 8-extruded polystyrene board, 9-polysulfide sealant layer, 10-pouring cavity of post-cast strip, 11-basement floor, 12-steel plate of waterstop, 13-intersection of post-cast strip, 14-dewatering well, 15-pump pipe, 16-submersible pump, 17-external drainage pump pipe, 18-pneumatic dewatering equipment, 19-chiseling part of post-cast strip, 20-pouring layer of post-cast strip. Detailed Implementation

[0063] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0064] like Figure 1-10 As shown, the present invention provides a method for waterproofing the post-pouring strip of a basement floor slab, comprising the following steps:

[0065] S100: Excavation of the basement foundation 1 and the post-cast strip recessed foundation 2;

[0066] S200: Concrete cushion layer is poured to form the concrete cushion layer 3 of the basement floor and the concave deformation buffer zone 6 of the post-pouring strip.

[0067] S300: Surface treatment of the concrete cushion layer 3 of the basement floor slab is performed to keep it flat and dry;

[0068] S400: Waterproofing construction is carried out on the surface of the concrete cushion layer 3 of the basement floor and the concave deformation buffer strip 6 of the post-cast strip.

[0069] S500: Carry out the reinforcement binding work for the basement floor slab and post-cast strip, and at the same time install the waterstop steel plate 12;

[0070] S600: Pour the basement floor slab 11, and then perform concrete curing after completion;

[0071] S700: An advanced water-stopping structure is installed in the casting cavity of the post-cast strip and at the intersection of the post-cast strip;

[0072] S800: The concrete structure on both sides of the post-cast strip is roughened and coated with cement-based penetrating crystalline waterproof coating, and then cast into shape using concrete.

[0073] like Figure 1 As shown, in step S100, when excavating the basement foundation 1 and the post-cast strip recessed foundation 2, the basement is excavated using a combination of mechanical and manual excavation methods according to the design requirements. When the excavation reaches 200mm-300mm above the design foundation elevation, manual excavation is used.

[0074] like Figure 2 As shown, in step S200, the pouring of the concrete cushion layer 3 of the basement floor slab and the concave deformation buffer zone under the post-pouring strip includes the following steps:

[0075] S201: 100mm C20 fine aggregate concrete is used to pour the foundation 1 of the basement floor and the recessed foundation 2 of the post-cast strip;

[0076] S202: After pouring, perform a second surface finishing and smoothing;

[0077] S203: Water curing until design strength is achieved.

[0078] Among them, after the top of the post-cast strip recessed foundation 2 is poured, it is smoothed and polished to form the post-cast strip recessed deformation buffer zone 6. The post-cast strip recessed deformation buffer zone 6 has a concave structure, and the bottom of the middle part is a groove-shaped structure. The shoulders of the groove on both sides are connected to the concrete cushion layer 3 of the basement floor through a gentle slope.

[0079] In this embodiment of the invention, the surface treatment operation of the concrete cushion layer 3 of the basement floor slab described in step S300 includes the following steps:

[0080] S301: Clean debris, laitance, loose concrete, etc. from the surface of the subbase;

[0081] S302: For unevenness, cracks and other defects in the subbase, repair and smooth it with cement mortar or fine stone concrete. At the inside and outside corners, use cement mortar to make an arc with a radius of not less than 50mm or an obtuse angle of 45°.

[0082] S303: Use a hair dryer or broom to remove dust from the surface of the substrate, ensuring that the substrate is dry and has a moisture content of no more than 9%.

[0083] In step S400, the waterproofing construction of the concrete cushion layer 3 of the basement floor and the surface layer of the post-cast cushion layer includes the following steps:

[0084] S401: Apply non-curing asphalt waterproof coating to the inside and outside corners of the concrete cushion layer 3 of the basement floor and the concave deformation buffer zone of the post-cast strip to strengthen the treatment and form a non-curing asphalt waterproof coating layer 4.

[0085] S402: Install SBS asphalt pre-laid reverse-adhesive waterproof membrane 5;

[0086] S403: An external rubber waterstop 7 is installed at the bottom of the groove of the concave deformation buffer strip 6.

[0087] In step S403, the external waterstop 7 is pasted in the predetermined position using a special adhesive. The pasting should be firm and free from defects such as hollowness or curling. The overlap length should be not less than 100mm and the overlap should be sealed with sealant.

[0088] In this embodiment of the invention, the rebar tying operation described in step S500 includes the following steps:

[0089] S501: Bind the reinforcement bars of the basement floor slab and post-cast strip;

[0090] S502: Accurately place the waterstop steel plate 12 in the design position and fix it to the steel bar with steel bar clips or lead wire, with a spacing of ≤500mm;

[0091] In step S502, a suitable standardized waterstop steel plate is used at the corner of the post-cast strip. The contact parts of the overlapping waterstop steel plates should be fully welded on both sides, and the weld slag should be cleaned.

[0092] In this embodiment of the invention, the concrete curing process following the pouring of the basement floor slab 11 in step S600 includes the following steps:

[0093] S601: Clean the debris and water inside the concave deformation buffer zone 6 of the post-pouring strip again;

[0094] S602: Formwork is provided at 6 locations of the concave deformation buffer zone of the post-pouring strip to leave the post-pouring strip pouring cavity and an expansion joint located at the center of the bottom of the post-pouring strip pouring cavity; the post-pouring strip pouring cavity is provided with a slope that gradually decreases in height from the outer end to the intersection 13 of the post-pouring strip.

[0095] S603: A water pump placement cavity is partitioned out at the bottom of the intersection 13 of the post-pouring strip using a template. This water pump placement cavity is the lowest point inside the post-pouring strip.

[0096] S604: Tie and fix the water pump pipe to the steel bar, and seal the bottom pipe opening and fit it against the outside of the water pump placement cavity template.

[0097] S605: When pouring concrete, mechanical vibration is used; the concrete slump is controlled at 160-180mm. Mechanical vibration is used, and the vibration time is based on the concrete surface becoming smooth, no more air bubbles appearing, and no more settling. Avoid the vibrator touching the waterstop and formwork.

[0098] S606: After the concrete is poured, smooth the surface with a wooden trowel in time. After the concrete has initially set, remove the formwork and smooth it with an iron trowel. The allowable deviation of the surface flatness is ±3mm; complete the pouring of the basement floor slab 11.

[0099] In this embodiment of the invention, step S700, which involves setting an advanced water-stopping structure at the post-cast strip and the intersection 13 of the post-cast strip, includes the following steps:

[0100] S701: Extruded polystyrene board 8 is used to fill expansion joints;

[0101] S702: After completing the caulking work, seal the top of the expansion joint with polysulfide sealant.

[0102] In step S701, after removing the formwork, the cut extruded polystyrene (XPS) board is placed into the expansion joint, ensuring it fits tightly against the joint wall. If the board length exceeds the joint width, it needs to be cut to ensure the appropriate length. Using XPS board for joint filling provides elasticity, allowing it to adapt to deformation within a certain range without damage, thus maintaining the filling effect. When used in conjunction with polysulfide sealant, it effectively prevents moisture from entering the expansion joint, reducing water erosion of the structure and extending the building's service life.

[0103] In step S702, before using polysulfide sealant, check whether the sealant is smooth and glossy, free of foreign matter, and free of crusting or peeling. If necessary, a test section can be applied first for inspection. After the joint is filled, check that the polysulfide sealant is firmly bonded to the expansion joint, the bonded joint is neat and smooth, and the polysulfide sealant layer 9 is fully vulcanized into an elastic shape after curing. The hardness of the polysulfide sealant layer must meet the design requirements.

[0104] In this embodiment of the invention, step S800 involves roughening the concrete structure on both sides of the post-cast strip and applying a cement-based penetrating crystalline waterproof coating. The post-cast strip 10 is then formed by pouring concrete, comprising the following steps:

[0105] S801: Install the submersible pump 16 and connect its output end to the pre-embedded water pump pipe 15;

[0106] S802: Roughen the sides of the post-cast strip pouring cavity;

[0107] S803: Remove the laitance and loose stones from the surface of the post-cast strip pouring cavity structure, clean the area around the steel plate waterstop, and use a high-pressure water gun to rinse. The rinsed water and impurities are collected at the intersection of the post-cast strip through the slope structure of the post-cast strip.

[0108] S804: Impurities are cleaned manually, and water is pumped out by submersible pump 16.

[0109] S805: After drying, spray cement-based penetrating crystalline waterproof coating around the bottom of the casting cavity of the post-cast strip;

[0110] S806: High-grade micro-expansion impermeable concrete is used for pouring to form a post-pouring strip layer of 20.

[0111] In step S802, the post-pouring strip pouring cavity is roughened using a slow-setting method to avoid interference from the reinforcing steel bars in the post-pouring strip and increase the difficulty of the operation. By spraying a concrete surface retarder on the inside of the formwork in advance, the solidification time of the concrete surface slurry is delayed. After the surrounding concrete reaches a certain strength, the loose slurry on the surface is removed with a high-pressure water gun or a brush tool to form a rough surface post-pouring strip chiseling part 19.

[0112] In step S804, the submersible pump is wrapped with a filter cloth to prevent clogging of the pump body; the pump pipe 15 pumps the accumulated water into the dewatering well 14, and the pneumatic dewatering device 18 pumps the water out of the dewatering well 14 through the external discharge pump 17 and sends it to the sedimentation tank for secondary use.

[0113] The waterproof construction method for post-pouring strips of the present invention involves setting an external rubber waterstop at the bottom of the groove of the concave deformation buffer strip 6, setting an advanced waterstop structure at the pouring cavity and intersection of the post-pouring strip, filling the expansion joint with extruded polystyrene board, and sealing the top of the expansion joint with polysulfide sealant. This method avoids the erosion of the advanced waterstop structure by rainwater and cleaning water, thereby improving the waterproof durability of the post-pouring strip.

[0114] The waterproof construction method for post-pouring strips of the present invention involves providing a slope in the post-pouring strip pouring cavity that gradually decreases in height from the outer end to the intersection 13 of the post-pouring strip, and using a template to partition a water pump placement cavity at the bottom of the intersection 13 of the post-pouring strip. This water pump placement cavity is the lowest point inside the post-pouring strip, thereby utilizing the height difference to concentrate the wastewater used in the pouring process into the water pump placement cavity. A submersible pump 16 is connected to the water pump placement cavity through a pre-embedded water pump pipe, which facilitates the pumping out of the accumulated water in the intersection of the post-pouring strip to the dewatering well. This ensures that the interior of the post-pouring strip is dry and free of water accumulation, avoids corrosion of the post-pouring strip reinforcement, reduces the need for rust prevention treatment of the post-pouring strip reinforcement, ensures the quality of the reinforcement in the post-pouring strip, and saves on reinforcement maintenance costs.

[0115] The waterproofing construction method for post-pouring strips of the present invention improves the waterproofing performance of post-pouring strips by setting an external rubber waterstop at the bottom of the groove of the concave deformation buffer strip 6, thereby increasing the deformation allowance of the waterproofing material at the post-pouring strip location.

[0116] The waterproof construction method for post-pouring strips of this invention employs a slow-setting method to roughen the pouring cavity of the post-pouring strip, avoiding interference from the reinforcing steel bars and reducing operational difficulty. By creating a slope in the pouring cavity that gradually decreases in height from the outer end to the intersection of the post-pouring strips at point 13, and using a high-pressure water gun to clean the post-pouring strip, impurities can be quickly concentrated in the water pump placement cavity at the lowest point inside the post-pouring strip. Wastewater is automatically collected due to the height difference, and operators only need to remove impurities at the water pump placement cavity, greatly reducing the difficulty of manual cleaning. During the pouring of the post-pouring strip, the base layer is free of impurities and water accumulation, ensuring the self-waterproofing performance of the post-pouring strip.

[0117] The present invention also provides a waterproof structure for post-pouring strips, comprising:

[0118] The post-cast strip recessed foundation 2 has a post-cast strip recessed deformation buffer strip 6 at its top; the post-cast strip recessed deformation buffer strip 6 has a concave structure, with a groove-like structure at the bottom center, and the shoulders of the groove on both sides are connected to the concrete cushion layer 3 of the basement floor through a gentle slope.

[0119] The non-curing asphalt waterproof coating layer 4 and the SBS asphalt pre-laid reverse-adhesive waterproof membrane 5 are sequentially installed on the top of the concave deformation buffer strip 6 under the post-pouring strip, and the rubber waterstop 7 is located inside and outside the trench.

[0120] The post-cast strip pouring cavity 10 is located on the basement floor slab 11. The post-cast strip pouring cavity 10 is provided with a slope that gradually decreases in height from the outer end to the post-cast strip intersection 13. A water pump placement cavity is provided at the bottom of the post-cast strip intersection 13.

[0121] An expansion joint is located at the center of the bottom of the post-pouring strip pouring cavity. An extruded polystyrene board 8 is provided in the expansion joint. The bottom of the extruded polystyrene board 8 abuts against the external rubber waterstop 7, and a polysulfide sealant layer 9 is provided on the top to fill the joint.

[0122] The post-cast strip chisel section 19 located on both sides of the post-cast strip pouring cavity is provided with a sprayed cement-based penetrating crystalline waterproof coating layer.

[0123] And the post-cast strip pouring layer 20 formed by pouring micro-expansion high-grade impermeable concrete into the post-cast strip pouring cavity 10.

[0124] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for waterproofing the post-pouring strip of a basement floor slab, characterized in that, Includes the following steps: S100: Excavation of the basement foundation and the recessed foundation with post-cast strip; S200: Concrete cushion layer is poured to form the concrete cushion layer of the basement floor and the concave deformation buffer zone of the post-cast strip. S300: Surface treatment of the concrete foundation layer of the basement slab to keep it flat and dry; S400: Waterproofing construction is carried out on the surface of the concrete cushion layer of the basement floor and the concave deformation buffer zone of the post-cast strip. S500: Carry out the reinforcement binding work for the basement floor slab and post-cast strip, and install the waterstop steel plate at the same time; S600: Pour the basement floor slab and then cure the concrete. S700: An advanced water-stopping structure is installed in the casting cavity of the post-cast strip and at the intersection of the post-cast strip; S800: The concrete structure on both sides of the post-cast strip is roughened and coated with cement-based penetrating crystalline waterproof coating, and then cast into shape using concrete.

2. The method for waterproofing the post-pouring strip of a basement floor slab according to claim 1, characterized in that, When performing step S400, the following steps are included: S401: Apply non-curing asphalt waterproof coating to the inside and outside corners of the concrete cushion layer and the concave deformation buffer zone of the post-cast strip of the basement floor to form a non-curing asphalt waterproof coating layer. S402: Lay out SBS bitumen pre-laid reverse-adhesive waterproof membrane; S403: An external rubber waterstop is installed at the bottom of the groove of the concave deformation buffer strip.

3. The method for waterproofing the post-pouring strip of a basement floor slab according to claim 2, characterized in that, When performing step S600, the following steps are included: S601: Clean the debris and water in the concave deformation buffer zone of the post-cast strip again; S602: Formwork is provided at the concave deformation buffer zone of the post-pouring strip to leave the post-pouring strip pouring cavity and an expansion joint located at the center of the bottom of the post-pouring strip pouring cavity; the post-pouring strip pouring cavity is provided with a slope that gradually decreases in height from the outer end to the intersection of the post-pouring strip. S603: A water pump placement cavity is partitioned off at the bottom of the intersection of the post-pouring strip using a template. This water pump placement cavity is the lowest point inside the post-pouring strip. S604: Tie and fix the water pump pipe to the steel bar, and seal the bottom pipe opening and fit it against the outside of the water pump placement cavity template. S605: When pouring concrete, mechanical vibration is used; the concrete slump is controlled at 160-180mm. Mechanical vibration is used, and the vibration time is based on the concrete surface becoming smooth, no more air bubbles appearing, and no more settling. Avoid the vibrator touching the waterstop and formwork. S606: After the concrete is poured, smooth the surface with a wooden trowel in time. After the concrete has initially set, remove the formwork and smooth it with an iron trowel. The allowable deviation of the surface flatness is ±3mm; complete the pouring of the basement floor slab.

4. The method for waterproofing the post-pouring strip of a basement floor slab according to claim 3, characterized in that, When performing step S700, the following steps are included: S701: Extruded polystyrene boards shall be used to fill expansion joints; S702: After completing the caulking work, seal the top of the expansion joint with polysulfide sealant.

5. A method for waterproofing the post-pouring strip of a basement floor slab according to any one of claims 1-4, characterized in that, When performing step S200, the following steps are included: S201: 100mm C20 fine aggregate concrete is used to pour the foundation of the basement floor slab and the recessed foundation of the post-cast strip; S202: After pouring, perform a second surface finishing and smoothing; S203: Water curing until design strength is reached; After the top of the post-cast strip recessed foundation is poured, it is smoothed and polished to form a post-cast strip recessed deformation buffer zone. This post-cast strip recessed deformation buffer zone has a concave structure, with a groove-like structure at the bottom center. The shoulders of the groove on both sides are connected to the concrete cushion layer of the basement floor through a gentle slope.

6. A method for waterproofing the post-pouring strip of a basement floor slab according to any one of claims 1-4, characterized in that, When performing step S500, the following steps are included: S501: Bind the reinforcement bars of the basement floor slab and post-cast strip; S502: Accurately place the waterstop steel plate in the design position and fix it to the steel bar with steel bar clips or wire, with a spacing of ≤500mm; In step S502, a suitable standardized waterstop steel plate is used at the corner of the post-cast strip. The contact parts of the overlapping waterstop steel plates should be fully welded on both sides, and the weld slag should be cleaned.

7. A method for waterproofing the post-pouring strip of a basement floor slab according to any one of claims 1-4, characterized in that, When performing step S800, the following steps are included: S801: Install the submersible pump and connect its output end to the pre-buried water pump pipe; S802: Roughen the sides of the post-cast strip pouring cavity; S803: Remove the laitance and loose stones from the surface of the post-cast strip pouring cavity structure, clean the area around the steel plate waterstop, and use a high-pressure water gun to rinse. The rinsed water and impurities are collected at the intersection of the post-cast strip through the slope structure of the post-cast strip. S804: Impurities are cleaned manually, and wastewater is pumped out using a submersible pump; S805: After drying, spray cement-based penetrating crystalline waterproof coating around the bottom of the casting cavity of the post-cast strip; S806: High-grade micro-expansion impermeable concrete is used for pouring to form a post-pouring strip layer of 20.

8. The method for waterproofing the post-pouring strip of a basement floor slab according to claim 7, characterized in that, When performing step S802, the following steps are included: roughening the pouring cavity of the post-pouring strip using a retarding method, delaying the setting time of the concrete surface slurry by spraying a concrete surface retarder on the inside of the template in advance, and removing the loose slurry on the surface with a high-pressure water gun or brush tool after the surrounding concrete has reached a certain strength, forming a rough surface post-pouring strip chiseled part.

9. The method for waterproofing the post-pouring strip of a basement floor slab according to claim 7, characterized in that, During the construction of step S804, the submersible pump is wrapped with a filter cloth to prevent clogging of the pump body; the water pump pipe pumps the accumulated water into the dewatering well, and the pneumatic dewatering equipment pumps the water out of the dewatering well through the external drainage pump and sends it to the sedimentation tank for secondary use.

10. A waterproof structure for post-cast strips in basement floor slabs, obtained by the construction method described in any one of claims 1-9, characterized in that, include: The post-cast strip recessed foundation has a post-cast strip recessed deformation buffer strip at the top; the post-cast strip recessed deformation buffer strip has a concave structure, with a groove-like structure at the bottom center, and the shoulders of the groove on both sides are connected to the concrete cushion layer of the basement floor through a gentle slope. The non-curing asphalt waterproof coating layer and the SBS asphalt pre-laid reverse-adhesive waterproof membrane are sequentially installed on the top of the concave deformation buffer strip under the post-pouring strip, as well as the rubber waterstop strips attached inside and outside the trench. The post-cast strip pouring cavity is located on the basement floor slab. The post-cast strip pouring cavity is provided with a slope that gradually decreases in height from the outer end to the intersection of the post-cast strips. A water pump placement cavity is provided at the bottom of the intersection of the post-cast strips. An expansion joint is located at the center of the bottom of the post-pouring strip pouring cavity. An extruded polystyrene board is installed in the expansion joint. The bottom of the extruded polystyrene board abuts against the external rubber waterstop, and a polysulfide sealant layer is installed on the top to fill the joint. The post-cast strip chisel section located on both sides of the post-cast strip pouring cavity is coated with a layer of sprayed cement-based penetrating crystalline waterproof coating. And the post-cast strip layer formed by pouring micro-expansion high-grade impermeable concrete into the post-cast strip pouring cavity.

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