Advanced water stop construction method for post-cast strip of underground garage

Abstract

The invention provides an advanced water stop construction method for a post-cast strip of an underground garage. The advanced water stop construction method comprises the following steps: S1, positioning and paying off the post-cast strip; s2, mounting a steel plate water stop belt; s3, an advanced water stop mold is installed; s4, special-shaped water stop bolts are installed; s5, the formwork is closed and reinforced; s6, concrete pouring; the basement exterior wall main body structure concrete is poured for the first time, the post-cast strip shrinkage compensation concrete is poured after maintenance is conducted for 45 days, the strength grade is improved by one grade and is larger than or equal to C35, and the anti-permeability grade is improved by P6-P8; s7, waterproof treatment is conducted, construction is conducted through a double-layer SBS waterproof coiled material full-bonding method, the lap joint length is larger than or equal to 100 mm, and internal and external corners are subjected to arc treatment with the R equal to 50 mm; and S8, quality detection is conducted, capillary crystalline waterproof paint is adopted for reinforcing treatment after forming, a 24-hour closed water test is conducted, and the leakage point is smaller than or equal to 0.5 / 100 m. The installation structure is optimized, the installation speed can be greatly increased, and the construction period is shortened.

Description

Technical Field

[0001] This invention belongs to the field of advanced water-stopping, and in particular relates to an advanced water-stopping construction method for post-cast strips in underground garages. Background Technology

[0002] Post-cast strips are temporary expansion joints set up in modern underground engineering (such as underground garages, basements, etc.) to solve the problems of shrinkage deformation, temperature stress and uneven settlement of ultra-long concrete structures. The following problems exist in the construction of post-pouring strips at this stage: High leakage rate: The welding quality of ordinary water-stop steel plates is unstable, and the leakage rate of underground garages reaches 70%; Long construction period: Continuous dewatering is required until the main structure is completed, and the pumping cost for a single project reaches 500,000 to 800,000 yuan; Structural hazards: The exposure time of the foundation pit for more than 6 months increases the risk of slope collapse by 30%; Material waste: The cast-in-place guide wall method increases the amount of steel reinforcement by 25%, and the precast cover plate method increases the amount of concrete by 15%. Summary of the Invention

[0003] In view of this, the present invention aims to propose a method for pre-water-stopping construction of post-cast strips in underground parking garages to solve the above problems.

[0004] To achieve the above objectives, the technical solution of the present invention is implemented as follows: The construction method for pre-sealing of post-cast strips in underground parking garages includes the following steps: S1. Positioning and marking of the post-pouring strip; S2. Installation of steel plate waterstop; S3. Installation of advanced waterstop mold; S4. Installation of special-shaped waterstop bolts; S5. Formwork sealing and reinforcement; S6. Concrete pouring: The concrete is poured in two stages. The first stage is the main structure concrete for the basement exterior wall. After curing for 45 days, the shrinkage compensation concrete for the post-pouring strip is poured. The strength grade is increased by one level and is ≥C35, and the impermeability grade is increased to P6-P8. S7. Waterproofing treatment: Double-layer SBS waterproof membrane is applied using the full-adhesion method, with an overlap length of ≥100mm, and the inside and outside corners are rounded with R=50mm. S8. Quality inspection: After molding, a penetrating crystalline waterproof coating is used for reinforcement treatment, and a 24-hour water tightness test is conducted. The leakage points are ≤0.5 per 100m². The advanced water-stop mold includes an upper template, a lower template, and a connecting plate; the two ends of the upper template and the lower template are respectively connected by a connecting plate to form an integral structure with a trapezoidal cross-section; the upper template is provided with several extended nuts that cooperate with the water-stop bolts; several support components are provided between the upper template and the lower template.

[0005] Furthermore, the support assembly includes an upper support plate and a lower support plate. The upper support plate is installed on the upper template, and the lower support plate is installed on the lower template. Both the upper and lower support plates are provided with through holes. When the upper and lower templates are assembled, the through holes of the upper and lower support plates are concentrically arranged. By passing bolts through the two through holes, the upper and lower support plates can be fixed, thereby achieving relative fixation between the upper and lower templates.

[0006] Furthermore, wedge-shaped strips are provided at both the upper and lower ends of the connecting plate; Both the upper and lower templates are provided with wedge grooves corresponding to the wedge strips. The wedge strips are inserted into the wedge grooves to achieve a fixed connection between the upper template, the connecting plate, and the lower template.

[0007] Furthermore, the lower surface edge of the upper template is provided with a sloping protrusion, and the upper surface edge of the lower template is provided with a sloping recess. Both the ramp protrusion and the ramp depression are formed on an upwardly inclined mounting plane with the horizontal plane as the reference, and wedge-shaped grooves are provided on the mounting planes of the ramp protrusion and the ramp depression.

[0008] Furthermore, in step S1, the edge line of the post-pouring strip is marked on the foundation pad, with a line width of 2mm and an allowable deviation of ±5mm; the positions of the steel plate waterstops are symmetrically marked on both sides of the post-pouring strip, with a spacing error of ≤10mm.

[0009] Furthermore, in step S2, a 300mm×3mm cold-rolled steel plate waterstop is placed in the center with a burial depth of 150mm and the bent part facing the water-facing side; it is temporarily spot-welded to the horizontal reinforcement of the outer wall with an overlap length of 50mm, full welding on both sides, and a weld height ≥3mm; the alignment error between the bolt hole and the mold extended nut is ≤2mm.

[0010] Furthermore, in step S3, the distance between the top and bottom edges of the upper and lower templates is 600-800mm; the concentricity deviation of the through holes of the upper and lower support plates is ≤1mm.

[0011] Furthermore, in step S4, an M12 three-section water-stop bolt is used, with the water-stop ring and the steel plate water-stop strip welded on one side, and the weld is full and without leaks; the front end of the bolt is screwed into the mold with an extended nut, the exposed length is ≤5mm, and the tightening torque is ≥120N·m.

[0012] Furthermore, in step S5, the inner formwork of the exterior wall is made of 15mm thick film-coated plywood, and the joints are tightened with 50×70mm square timber secondary keels, with the main keel arranged along the entire length @600mm.

[0013] Furthermore, in step S6, 8-12% UEA expansion agent is added to the shrinkage-compensating concrete, the pouring temperature is controlled at 5-30℃, the thickness of each layer is ≤300mm, and the interval between the two vibrations is 2 hours.

[0014] Compared with existing technologies, the pre-water-stopping construction method for post-cast strips in underground parking garages described in this invention has the following advantages: (1) The pre-water-stopping construction method of the underground garage post-pouring strip of the present invention uses square steel and angle steel for standardized welding of the pre-water-stopping mold, and uses self-tapping dovetail nails to fix the backing plate, which greatly improves the installation speed, reduces the labor input, and saves labor costs; by pre-closing the post-pouring strip, the water can be stopped after the main structure is completed without waiting for the post-pouring strip to be poured, saving water pumping costs.

[0015] (2) The method for pre-stopping water in the post-cast strip of underground garage described in this invention can save on dewatering costs and reduce material consumption.

[0016] (3) The construction method for pre-stopping water in the post-pouring strip of underground garage described in this invention has been optimized in terms of installation structure, which can greatly improve the installation speed and shorten the construction period. Attached Figure Description

[0017] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the advanced water-stopping construction of the post-cast strip in the underground garage according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the advanced water-stopping mold described in an embodiment of the present invention; Figure 3 This is a schematic diagram of the wedge-shaped strip and wedge-shaped groove as described in an embodiment of the present invention; Figure 4 This is a schematic diagram of the support component according to an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures: 1. Upper template; 11. Sloping protrusion; 2. Lower template; 21. Sloping depression; 3. Connecting plate; 31. Wedge strip; 32. Wedge groove; 4. Support assembly; 41. Upper support piece; 42. Lower support piece; 43. Through hole. Detailed Implementation

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0020] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] S1. Positioning and marking of the post-pouring strip; S2. Installation of steel plate waterstop; S3. Installation of advanced waterstop mold; S4. Installation of special-shaped waterstop bolts; S5. Formwork sealing and reinforcement; S6. Concrete pouring: The concrete is poured in two stages. The first stage is the main structure concrete for the basement exterior wall. After curing for 45 days, the shrinkage compensation concrete for the post-pouring strip is poured. The strength grade is increased by one level and is ≥C35, and the impermeability grade is increased to P6-P8. S7. Waterproofing treatment: Double-layer SBS waterproof membrane is applied using the full-adhesion method, with an overlap length of ≥100mm, and the inside and outside corners are rounded with R=50mm. S8. Quality inspection: After molding, a penetrating crystalline waterproof coating is used for reinforcement treatment, and a 24-hour water tightness test is conducted. The leakage points are ≤0.5 per 100m². The advanced water-stop mold includes an upper template 1, a lower template 2, and a connecting plate 3; the two ends of the upper template 1 and the lower template 2 are respectively connected by a connecting plate 3 to form an integral structure with a trapezoidal cross section; the upper template 1 is provided with several extended nuts that cooperate with the water-stop bolts; several support components 4 are provided between the upper template 1 and the lower template 2.

[0024] Preferably, the support assembly 4 includes an upper support piece 41 and a lower support piece 42. The upper support piece 41 is installed on the upper template 1, and the lower support piece 42 is installed on the lower template 2. Both the upper support piece 41 and the lower support piece 42 are provided with through holes 43. When the upper template 1 and the lower template 2 are assembled, the through holes 43 of the upper support piece 41 and the lower support piece 42 are concentrically arranged. By passing bolts through the two through holes 43, the upper support piece 41 and the lower support piece 42 can be fixed, thereby achieving relative fixation between the upper template 1 and the lower template 2.

[0025] Preferably, the connecting plate 3 is provided with wedge-shaped strips 31 at both the upper and lower ends; Both the upper template 1 and the lower template 2 are provided with wedge grooves 32 corresponding to the wedge strips 31. The wedge strips 31 are inserted into the wedge grooves 32, which can realize the fixed connection between the upper template 1, the connecting plate 3 and the lower template 2.

[0026] Preferably, the lower surface edge of the upper template 1 is provided with a sloping protrusion 11, and the upper surface edge of the lower template 2 is provided with a sloping recess 21. Both the ramp protrusion 11 and the ramp depression 21 are formed on an upwardly inclined mounting plane with the horizontal plane as a reference. Wedge-shaped grooves are provided on the mounting planes of the ramp protrusion 11 and the ramp depression 21. The angle between the mounting plane and the horizontal plane is between 30° and 45°; this design optimizes water flow guidance, enhances the water-stopping effect, and further prevents leakage.

[0027] Preferably, in step S1, the edge line of the post-pouring strip is marked on the foundation pad, with a line width of 2mm and an allowable deviation of ±5mm; the positions of the steel plate waterstops are symmetrically marked on both sides of the post-pouring strip, with a spacing error of ≤10mm.

[0028] Preferably, in step S2, a 300mm×3mm cold-rolled steel plate waterstop is placed in the center with a burial depth of 150mm and the bent part facing the water-facing side; it is temporarily spot-welded to the horizontal reinforcement of the outer wall with an overlap length of 50mm, full welding on both sides, and a weld height ≥3mm; the alignment error between the bolt hole and the mold extended nut is ≤2mm.

[0029] Preferably, in step S3, the distance between the top and bottom edges of the upper and lower templates is 600-800mm; the concentricity deviation of the through holes of the upper and lower support plates is ≤1mm.

[0030] Preferably, in step S4, an M12 three-section water-stop bolt is used, with the water-stop ring and the steel plate water-stop strip welded on one side, and the weld is full and without leaks; the front end of the bolt is screwed into the mold with an extended nut, the exposed length is ≤5mm, and the tightening torque is ≥120N·m.

[0031] Preferably, in step S5, the inner side formwork of the exterior wall is made of 15mm thick film-coated plywood, and the joints are tightened with 50×70mm square timber secondary keels, with the main keel arranged along the entire length @600mm.

[0032] Preferably, in step S6, the shrinkage-compensating concrete is mixed with 8-12% UEA expansion agent, the pouring temperature is controlled at 5-30℃, the layer pouring thickness is ≤300mm, and the interval between the second vibration is 2 hours.

[0033] Example 1: 1. Positioning and layout of post-pouring strip: Mark a 2mm wide ink line on the foundation pad, with an allowable deviation of ±5mm. The steel plate waterstops on both sides are symmetrically arranged with a spacing error of ≤10mm. 2. Waterstop installation: 300×3mm cold-rolled steel plate, buried at a depth of 150mm, with the bent part facing the water-facing side, double-sided full weld lap of 50mm, and weld height of 3mm; 3. Mold installation: The trapezoidal mold spacing is 600mm, the concentricity deviation of the through holes of the support plate is ≤1mm, and the wedge groove connection ensures a seal; 4. Bolt reinforcement: M12 three-section water-stop bolts, with the water-stop ring welded to the steel plate on one side, torque 120 N·m, and exposed length 3 mm; 5. Concrete pouring: The first pour is C30P6 concrete, and after curing for 45 days, C35P8 shrinkage-compensating concrete (mixed with 10% UEA) is poured. 6. Waterproofing treatment: Double-layer SBS roll material with 100mm overlap, and R50 rounded corners for inside and outside corners; 7. Quality Inspection: The penetrating crystallizing coating is reinforced, and the water tightness test shows 0.3 leakage points per 100m².

[0034] Example 2: 1. Mold upgrade: Φ16 anchor steel bars are added to the connecting plate, and the wedge groove is changed to a dovetail groove structure or a T-groove structure; 2. Waterstop components: 316L stainless steel waterstop strip is used, with a weld height of 4mm, and an Ω-shaped waterstop ring is added; 3. Pouring process: Φ25 grouting pipes are pre-embedded during the first pour (spaced 3m apart), and micro-expansion concrete is used to fill the subsequent pouring strip; 4. Anti-buoyancy measures: Install Φ48 steel perforated pipe dewatering wells, with a well depth 3m deeper than the bottom plate, and wrap the filter pipes with 30-mesh filter screens; 5. Monitoring system: Settlement displacement sensors are installed to monitor the deformation of the post-cast strip area in real time.

[0035] Example 3: Conditions in cold regions 1. Mold insulation: A 50mm rock wool insulation layer is added to the connecting plate, and the support plate is made of Q235D low-temperature resistant steel; 2. Pouring control: The concrete pouring temperature should be ≥10℃, covered with double-layer flame-retardant insulation blankets, and cured using electric blankets + steam curing. 3. Antifreeze measures: Early-strength antifreeze agent (applicable to -15℃) is added to the shrinkage-compensating concrete, and the demolding temperature is ≥5℃; 4. Joint treatment: Use tongue and groove type rubber waterstop, and apply polyurethane sealant (thickness ≥3mm) to the joint.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for pre-sealing water-stopping construction of post-cast strips in underground parking garages, characterized by: Includes the following steps: S1. Positioning and marking of the post-pouring strip; S2. Installation of steel plate waterstop; S3. Installation of advanced waterstop mold; S4. Installation of special-shaped waterstop bolts; S5. Formwork sealing and reinforcement; S6. Concrete pouring: The concrete is poured in two stages. The first stage is the main structure concrete for the basement exterior wall. After curing for 45 days, the shrinkage compensation concrete for the post-pouring strip is poured. The strength grade is increased by one level and is ≥C35, and the impermeability grade is increased to P6-P8. S7. Waterproofing treatment: Double-layer SBS waterproof membrane is applied using the full-adhesion method, with an overlap length of ≥100mm, and the inside and outside corners are rounded with R=50mm. S8. Quality inspection: After molding, a penetrating crystalline waterproof coating is used for reinforcement treatment, and a 24-hour water tightness test is conducted. The leakage points are ≤0.5 per 100m². The advanced water-stop mold includes an upper template, a lower template, and a connecting plate; the two ends of the upper template and the lower template are respectively connected by a connecting plate to form an integral structure with a trapezoidal cross-section; the upper template is provided with several extended nuts that cooperate with the water-stop bolts; several support components are provided between the upper template and the lower template.

2. The method for pre-water-stopping construction of post-cast strips in underground parking garages according to claim 1, characterized in that: The support assembly includes an upper support plate and a lower support plate. The upper support plate is installed on the upper template, and the lower support plate is installed on the lower template. Both the upper and lower support plates are provided with through holes. When the upper and lower templates are assembled, the through holes of the upper and lower support plates are concentrically arranged. By passing bolts through the two through holes, the upper and lower support plates can be fixed, thereby achieving relative fixation between the upper and lower templates.

3. The method for pre-sealing water in the post-cast strip of an underground parking garage according to claim 1, characterized in that: Both the upper and lower ends of the connecting plate are provided with wedge-shaped strips; Both the upper and lower templates are provided with wedge grooves corresponding to the wedge strips. The wedge strips are inserted into the wedge grooves to achieve a fixed connection between the upper template, the connecting plate, and the lower template.

4. The method for pre-water-stopping construction of post-cast strips in underground parking garages according to claim 1, characterized in that: The lower surface edge of the upper template is provided with a sloping protrusion, and the upper surface edge of the lower template is provided with a sloping recess. Both the ramp protrusion and the ramp depression are formed on an upwardly inclined mounting plane with the horizontal plane as the reference, and wedge-shaped grooves are provided on the mounting planes of the ramp protrusion and the ramp depression.

5. The method for pre-sealing water in the post-cast strip of an underground parking garage according to claim 1, characterized in that: In step S1, the edge line of the post-pouring strip is marked on the foundation pad, with a line width of 2mm and an allowable deviation of ±5mm; the positions of the steel plate waterstop are marked symmetrically on both sides of the post-pouring strip, with a spacing error of ≤10mm.

6. The method for pre-water-stopping construction of post-cast strips in underground parking garages according to claim 1, characterized in that: In step S2, a 300mm×3mm cold-rolled steel plate waterstop is placed in the center with a burial depth of 150mm and the bent part facing the water-facing side; it is temporarily spot-welded to the horizontal reinforcement of the outer wall with an overlap length of 50mm, full welding on both sides, and a weld height ≥3mm; the alignment error between the bolt hole and the mold extended nut is ≤2mm.

7. The method for pre-sealing water in post-cast strips of underground parking garages according to claim 1, characterized in that: In step S3, the distance between the top and bottom edges of the upper and lower templates is 600-800mm; the concentricity deviation of the through holes of the upper and lower support plates is ≤1mm.

8. The method for pre-water-stopping construction of post-cast strips in underground parking garages according to claim 1, characterized in that: In step S4, M12 three-section water-stop bolts are used, and the water-stop ring and the steel plate water-stop are welded on one side, with full welds and no leaks; the front end of the bolt is screwed into the mold with an extended nut, the exposed length is ≤5mm, and the tightening torque is ≥120N·m.

9. The method for pre-water-stopping construction of post-cast strips in underground parking garages according to claim 1, characterized in that: In step S5, the inner formwork of the exterior wall is made of 15mm thick film-coated plywood, and the joints are tightened with 50×70mm square timber secondary keels, with the main keel arranged along the entire length @600mm.

10. The method for pre-water-stopping construction of post-cast strips in underground parking garages according to claim 1, characterized in that: In step S6, 8-12% UEA expansion agent is added to the shrinkage-compensating concrete, the pouring temperature is controlled at 5-30℃, the thickness of each layer is ≤300mm, and the interval between the two vibrations is 2 hours.

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