Basement bottom plate post-cast strip waterproof structure and construction process thereof

Abstract

The basement bottom plate post-pouring belt waterproof structure and its construction process are disclosed. The waterproof structure comprises a bottom plate, a post-pouring belt body, a water guide component, a lap-uplifted part and a sealing waterproof layer. The water guide component is arranged in the bottom plate thickness range along the construction joint, the convex arc outer circumferential surface has a water filtering and permeating structure, the construction joint interface extends along the outer circumferential surface, the water guide channel is communicated with the construction joint interface and connected to the drainage facility. The lap-uplifted part is integrally formed with the post-pouring belt body, higher than the top surface of the bottom plate and across the construction joint; the sealing waterproof layer covers the exposed joint and extends to the top surface of the bottom plate. During construction, the water guide component is installed and connected to the drainage facility first; after pouring the bottom plate, the partition is removed and the convex arc surface is roughened, then the post-pouring belt body and the lap-uplifted part are poured and the sealing waterproof layer is arranged. The application can improve the processability of the construction joint interface, filter, collect and guide the water seepage, prolong and close the seepage path, and improve the construction quality and waterproof reliability of the post-pouring belt joint.

Description

Technical Field

[0001] This invention relates to the field of basement construction technology, and in particular to a waterproof structure for post-pouring strips in basement floor slabs and its construction process. Background Technology

[0002] Post-cast strips are temporary construction strips reserved to accommodate shrinkage deformation or uneven settlement in cast-in-place reinforced concrete structures. In basement slabs, post-cast strips are typically poured on both sides of the slab and then poured again after a specified curing period, forming a construction joint between the main body of the post-cast strip and the side slabs. This area is constantly exposed to groundwater, posing a risk of groundwater seepage along the construction joint. Therefore, the quality of its waterproofing directly affects the waterproofing performance and normal use of the basement.

[0003] Existing basement floor slab post-cast strip joints generally have water-stopping components installed at the construction joint, and the construction joint interface is treated accordingly; some joints are also equipped with drainage, filtration, vapor barrier or surface waterproofing structures to reduce the risk of leakage at the post-cast strip area.

[0004] However, in actual engineering projects, the construction quality of post-cast strip joints in basement slabs remains difficult to maintain consistently, and localized water seepage may still occur after completion. Some existing structures also suffer from inconvenient on-site operations, numerous construction procedures, complex process connections, long construction cycles, and susceptibility to damage to additional waterproofing structures, thus their long-term waterproofing effectiveness needs improvement.

[0005] Therefore, how to improve the construction quality and long-term waterproofing reliability of the post-cast strip joints in the basement floor slab while taking into account both construction operability and efficiency is a technical problem that needs to be solved in this field. Summary of the Invention

[0006] The present invention aims to provide a waterproof structure and construction process for post-pouring strips in basement floor slabs to solve the above-mentioned technical problems.

[0007] In a first aspect, the present invention provides a waterproof structure for a post-cast strip in a basement floor slab, comprising two floor slabs on both sides and a post-cast strip body located between the two floor slabs, wherein construction joints are formed between the post-cast strip body and the two floor slabs on both sides, and the waterproof structure further includes:

[0008] A water-guiding component is provided along the construction joints on both sides within the thickness range of the base plate. The outer peripheral surface of the water-guiding component is a convex arc surface and has a water-filtering and water-permeable structure. The construction joint interface between the base plate on both sides and the main body of the post-cast strip extends along the convex arc surface at the water-guiding component. The water-guiding component is provided with a water-guiding channel extending along its extension direction. The water-guiding channel communicates with the construction joint interface through the outer peripheral surface and is connected to the drainage facility.

[0009] The overlapping raised part is integrally formed on the top of the post-pouring strip body, and the overlapping raised part is higher than the top surface of the bottom plate on both sides and extends across the construction joint on both sides to the top surface of the bottom plate on both sides.

[0010] A sealing and waterproofing layer covers the exposed joint of the construction joint between the lapped raised portion and the base plates on both sides, and extends from the exposed joint to the top surface of the corresponding base plate.

[0011] Secondly, the present invention provides a construction process for a waterproof structure of a post-cast strip in a basement slab, applicable to the waterproof structure of a post-cast strip in a basement slab as described in the first aspect. The construction process includes the following steps:

[0012] S1. Install water guiding components with convex arc surfaces and water filtering and permeability structures on the two reserved construction joints along the post-cast strip, and ensure that each water guiding component is within the thickness range of the bottom plate.

[0013] S2. Connect the water guiding channels inside each of the water guiding components to the drainage facilities;

[0014] S3. Set up pouring partitions at the two reserved construction joints respectively, and pour concrete for the bottom slabs on both sides.

[0015] S4. After the concrete of each side of the base plate has cured, remove the pouring partition corresponding to that side, and roughen and clean the construction joint interface on that side along the convex arc surface.

[0016] S5. Concrete is poured between the two bottom plates to form a post-pouring strip body and an overlapping raised part. The overlapping raised part is higher than the top surface of the two bottom plates and extends across the reserved construction joint to the top surface of the two bottom plates.

[0017] S6. Cover the exposed seam between the lapped raised portion and the top surface of the bottom plate on both sides with a sealing and waterproofing layer, so that the sealing and waterproofing layer extends from the exposed seam to the top surface of the bottom plate on the corresponding side.

[0018] Beneficial technical effects of the present invention:

[0019] This invention provides water-guiding components with convex arc surfaces and water-filtering and permeable structures on the outer periphery within the thickness range of the construction joints on both sides. The construction joint interface extends along the convex arc surface, which helps improve the treatability of the construction joint interface, reduces local dead corners during interface treatment, and improves the bonding quality of the pre- and post-poured concrete. The outer periphery of the water-guiding component, the water-guiding channel, and the drainage facilities are connected, which can filter, collect, and guide the water seeping along the construction joint, which helps reduce the amount of water continuing to seep to the top surface of the base slab and reduce the seepage pressure on the upper waterproof structure. The overlapping raised part integrally formed on the top of the post-pouring strip body spans the construction joints on both sides and overlaps the top surface of the base slab on both sides. This can not only avoid the formation of a new joint between the post-pouring strip body and the overlapping raised part, but also move the exposed position of the construction joint outward and extend the seepage path. With the sealing waterproof layer covering the exposed joint opening and extending to the top surface of the base slab, the end of the seepage path is sealed. Thus, the waterproof structure forms a multi-layered waterproof system that combines interface treatment, in-joint drainage, path extension, and joint sealing. While taking into account both construction operability and the integrity of the joint structure, it is conducive to improving the construction quality and long-term waterproof reliability of the post-pouring strip joint of the basement floor slab. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below show some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A cross-sectional structural diagram of the waterproof structure of the post-cast strip of the basement floor slab provided in an embodiment of the present invention;

[0022] Figure 2 A three-dimensional structural schematic diagram of the water-guiding component provided in an embodiment of the present invention;

[0023] Figure 3 This is a partially enlarged schematic diagram showing the connection relationship between the water guiding component and the positioning bracket provided in an embodiment of the present invention;

[0024] Figure 4 This is a cross-sectional schematic diagram of the two-sided base plate pouring and curing and construction joint interface treatment stages provided in an embodiment of the present invention.

[0025] Figure 5 A cross-sectional schematic diagram of the concrete pouring and forming stage of the post-pouring strip provided in an embodiment of the present invention;

[0026] Figure 6 This is a partial cross-sectional schematic diagram of the sealing and waterproofing layer termination provided in an embodiment of the present invention;

[0027] Figure 7A schematic diagram of the construction process for the waterproof structure of the post-cast strip in the basement floor slab provided in an embodiment of the present invention.

[0028] Explanation of reference numerals in the attached figures:

[0029] In the diagram: 1-Base slab; 11-Top surface; 12-Upper layer reinforcement; 13-Lower layer reinforcement; 2-Main body of post-cast strip; 21-Overlapping raised part; 3-Construction joint; 31-Construction joint interface; 32-Exposed joint opening; 4-Water guiding component; 41-Convex arc surface; 42-Water guiding channel; 43-Permeable inner support pipe; 44-Permeable filter cloth; 5-Sealing waterproof layer; 6-Positioning bracket; 61-Vertical positioning reinforcement; 62-Horizontal support reinforcement; 8-Waterproof membrane; 9-Subbase; 10-Edge finishing formwork. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0032] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0033] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0034] Currently, the post-cast strip of the basement floor slab needs to be poured after the structures on both sides have been poured and after a corresponding curing period, thus forming a construction joint between the post-cast strip and the two floor slabs. This construction joint, located in the floor slab area, is in direct contact with groundwater and is the area with the highest risk of leakage within the floor slab area. To cut off seepage along this construction joint, the relevant technology usually involves embedding a flat, plate-shaped water-stopping component within the joint. However, the surface of the flat, plate-shaped water-stopping component intersects perpendicularly with the construction joint interface, forming a concave right angle at its junction with the concrete. Before the post-cast strip is poured, the upper and lower layers of reinforcing steel in the floor slab have already been tied. Chisel tools, extending downwards from above the post-cast strip and constrained by the reinforcing steel, cannot reach the aforementioned right angle. Therefore, laitance and slag inclusions at this location cannot be removed, instead leaving a continuous seepage channel at the construction joint interface.

[0035] In one embodiment of the present invention, a water-guiding component with an outwardly convex arc surface and a water-filtering and permeable structure is provided within the thickness range of the slab at the construction joint. This allows the construction joint interface to continuously circumvent the outwardly convex arc surface without forming an inwardly concave angle, thus enabling comprehensive treatment of the construction joint interface even under conditions where reinforcing steel is present and the insertion of tools is restricted. Simultaneously, the water-guiding component collects the seepage water passing through its outer circumference and directs it out along its internal water-guiding channels. Furthermore, the top of the post-cast strip body forms an overlapping and raised portion that extends beyond the construction joint and overlaps the top surface of the base slab. Combined with the sealing and waterproofing layer covering the joint opening, the remaining seepage path is extended and sealed at the end.

[0036] See Figure 1 This invention provides a waterproof structure for the post-cast strip of a basement floor slab. The waterproof structure includes a floor slab 1 located on both sides of the post-cast strip, a post-cast strip body 2 located between the two floor slabs 1, a water guiding component 4, an overlapping raised portion 21, and a sealing waterproof layer 5.

[0037] The base slab 1 and the main body 2 of the post-cast strip are poured in two stages, forming a construction joint 3 at their junction. The construction joint 3 extends from the bottom surface of the base slab 1 to the top surface 11 of the base slab 1, and the surfaces where the first and second poured concretes meet form the construction joint interface 31. Upper layer steel bars 12 and lower layer steel bars 13 are arranged along the thickness direction inside the base slab 1. A waterproof membrane 8 and a plain concrete pad 9 are sequentially installed below the bottom surface of the base slab 1. In the section where the post-cast strip is located, the waterproof membrane 8 and the plain concrete pad 9 partially sink and extend outwards from the construction joint 3 to both sides, forming a waterproof reinforcement layer for the post-cast strip area.

[0038] The water guiding components 4 are respectively installed along the construction joints 3 on both sides and are located within the thickness range of the base plate 1, that is, their installation elevation is between the bottom surface and the top surface 11 of the base plate 1. Figure 1The water-guiding component 4 is located between the upper layer of reinforcing bars 12 and the lower layer of reinforcing bars 13. The water-guiding component 4 extends along the length of the construction joint 3, and its extension direction is consistent with the direction of the construction joint 3, so that the water-guiding component 4 accompanies the entire length of the construction joint 3.

[0039] The outer peripheral surface 41 of the water-guiding component 4 is a convex arc surface. Here, a convex arc surface refers to a continuously convex curved surface, and the tangent at any point on it does not form an inwardly concave angle with the adjacent concrete. The construction joint interface 31 between the two bottom plates 1 and the main body 2 of the post-cast strip extends along the convex arc surface 41 at the water-guiding component 4: the interface between the first-cast concrete and the post-cast concrete does not break into two right-angle intersections when it encounters the water-guiding component 4, but instead continuously circles around the outer peripheral surface 41, and returns to the vertical plane where the construction joint 3 is located after bypassing the water-guiding component 4. Figure 1 In one arrangement shown, the axis of the water guiding member 4 lies in the vertical plane where the construction joint 3 is located. The side of the water guiding member 4 facing the base plate 1 and the side facing the post-cast strip body 2 are respectively wrapped by the pre-cast base plate 1 and the post-cast strip body 2. The construction joint interface 31 continuously circles around the outer peripheral surface 41 of the water guiding member 4 at this elevation.

[0040] The water-guiding component 4 has a water-guiding channel 42 extending along its extension direction. The outer peripheral surface 41 has a water-filtering and water-permeable structure, that is, the outer peripheral surface 41 allows water to pass through while preventing soil particles and fine cement paste particles from entering. The water-guiding channel 42 is connected to the construction joint interface 31 through the outer peripheral surface 41; the water-guiding channel 42 is connected to the drainage facility along its extension direction. After seepage water enters the water-guiding channel 42 through the outer peripheral surface 41 from the construction joint interface 31, it flows to the drainage facility along the extension direction of the water-guiding channel 42 and is discharged.

[0041] The overlapping raised portion 21 is integrally formed on the top of the post-cast strip body 2, and the two are continuous concrete bodies with no construction joint between them. The overlapping raised portion 21 is higher than the top surface 11 of the two side base plates 1, and extends from the top of the post-cast strip body 2 across the construction joints 3 on both sides to the top surface 11 of the two side base plates 1. That is, the outer periphery of the overlapping raised portion 21 falls on the top surface 11 of the base plate 1, rather than directly above the construction joint 3.

[0042] Thus, a horizontal joint is formed between the bottom surface of the overlapping raised portion 21 and the top surface 11 of the base plate 1. The inner end of this joint connects to the top of the construction joint 3, and its outer end protrudes from the top surface 11 of the base plate 1 at the outer periphery of the overlapping raised portion 21, forming an exposed joint opening 32. The construction joint 3, which was originally directly exposed at the top surface 11 of the base plate 1, is thus moved to the outer periphery of the overlapping raised portion 21.

[0043] The sealing and waterproofing layer 5 covers the exposed seam 32 and extends from the exposed seam 32 to the top surface 11 of the corresponding side bottom plate 1, forming a continuous and seamless sealing layer between the exposed seam 32 and the top surface 11 of the bottom plate 1. Figure 1 In one of the spread configurations shown, the sealing waterproof layer 5 is also turned up from the exposed seam 32 and extends upward along the outer periphery of the overlapping raised portion 21, and then continues to extend a distance on the top surface of the overlapping raised portion 21, thereby straddling the exposed seam 32.

[0044] The water guiding component 4 can be an internally supported plastic blind drain pipe, or a component composed of a permeable skeleton and a filter cloth covering it, or a permeable strip with an outwardly convex arc cross-section. The cross-sectional shape of its outer peripheral surface 41 can be circular, semi-circular, or elliptical.

[0045] The relative positions of the water-guiding component 4 and the construction joint 3, except Figure 1 In addition to the saddle-joint arrangement shown, an offset arrangement can also be adopted: the water-guiding component 4 is entirely embedded in one side of the pre-cast base slab 1, with only a portion of its outer peripheral surface 41 exposed at the construction joint interface 31 and in direct contact with the concrete of the post-cast strip body 2. As long as the construction joint interface 31 runs around the outer peripheral surface 41 at the water-guiding component 4, the interface maneuverability described below can be obtained.

[0046] Drainage facilities may be sump wells, sump pits, drainage ditches, blind drains, or drainage holes installed on the side walls of basements, including but not limited to the above forms.

[0047] The sealing and waterproofing layer 5 can be formed by applying non-curing rubber asphalt waterproof coating, polyurethane waterproof coating or polymer cement waterproof coating, or by laying self-adhesive waterproof membrane, or by filling with water-swellable waterstop strips and sealant.

[0048] The convex arc shape of the outer peripheral surface 41 of the water-guiding component 4 is interdependent with the fact that the construction joint interface 31 winds around the outer peripheral surface 41 at this location. Together, they determine the treatability of the construction joint interface 31. When the chisel extends downward from the side of the post-cast strip, its end slides along the tangent direction of the outer peripheral surface 41. The contact point moves continuously on the outer peripheral surface 41 as the extension angle changes, and there is no position on the interface that the end of the tool cannot reach. In contrast, if a flat water-stop component is used at the same location, its plate surface intersects the construction joint interface 31 perpendicularly to form a concave right angle. Under the condition that the upper reinforcing steel 12 has been tied and the tool is restricted from extending from above, the end of the tool cannot enter the root of this angle, and the laitance and slag at this location remain on the interface.

[0049] The water-guiding component 4 is located within the thickness range of the base plate 1, so that the water-guiding channel 42 it provides is located on the way for seepage water to travel upward along the construction joint interface 31. The water-filtering and permeable structure of the outer peripheral surface 41 and the water-passing cross-section of the water-guiding channel 42 have a much greater water-passing capacity than the micro-gaps on the construction joint interface 31. Therefore, when the seepage water reaches this elevation, most of it can pass through the outer peripheral surface 41 into the water-guiding channel 42 and be drained away, with only a small amount continuing to travel upward along the construction joint interface 31.

[0050] The lapped raised section 21 spans the construction joint 3 and overlaps the top surface 11 of the base slab 1. This prevents the upward seepage water from exiting directly after reaching the top surface 11 of the base slab 1. Instead, it redirects the water flow horizontally, traveling outward along the joint between the bottom surface of the lapped raised section 21 and the top surface 11 of the base slab 1 until it reaches the exposed joint opening 32. The seepage path changes from a straight vertical line that runs through the slab thickness to a broken line where the vertical and horizontal sections meet, with a corresponding increase in length. The sealing waterproof layer 5 covers the end of this broken line and extends outward along the top surface 11 of the base slab 1 with an overlap width, thus sealing the exposed joint opening 32.

[0051] The aforementioned structural relationships act on the same seepage path, forming three layers of defense in sequence, rather than three independent measures.

[0052] The first layer is on the construction joint interface 31 itself. Since the outer peripheral surface 41 is a convex arc surface and the construction joint interface 31 runs around it, the interface can be cleaned as thoroughly as possible, leaving no laitance or slag on the interface. The first and second poured concretes are tightly bonded, and the interface's own permeability is weakened.

[0053] The second layer is located at the water-conducting component 4. Any seepage water that travels up to this elevation along the construction joint interface 31 will encounter the outer periphery 41 and the water-conducting channel 42, which have a water-passing capacity much greater than the interface joint. Most of this water can be diverted and discharged to the drainage facility along the water-conducting channel 42.

[0054] The third layer is located at the overlap raised section 21 and the sealing waterproof layer 5. A small amount of water seeping over the second layer travels along a zigzag path extended by the overlap raised section 21 and is sealed by the sealing waterproof layer 5 at the exposed joint 32.

[0055] The three layers are not independent of each other. The water-guiding component 4, which performs the function of intercepting and draining the second layer, has an outer circumferential surface 41 that serves as both the entrance for seepage into the water-guiding channel 42 and the surface that allows the construction joint interface 31 to bypass the seepage without leaving any dead corners for chiseling. Therefore, the first layer is provided incidentally by the same component of the second layer, and is not a separate measure. The third layer seals the outlet of the seepage path on the top surface 11 side of the base plate 1. The seepage flowing upward along the construction joint interface 31 loses its place to be exposed on-site, and instead flows more into the water-guiding channel 42, thereby increasing the diversion ratio of the second layer. Conversely, the water-guiding channel 42 is discharged at normal pressure through the drainage facility. The seepage drained by the second layer no longer acts on the third layer, and the joint section above this elevation no longer accumulates water pressure. The water head borne by the sealing waterproof layer 5 is reduced accordingly, and the risk of it being pushed open or peeled off is reduced. The three layers are interdependent and work together on the same seepage path.

[0056] In addition, the water-guiding component 4 replaces the flat water-stopping component in the joint, eliminating the need for welding and fixing in areas with dense reinforcement, thus avoiding the risk of leaving holes in the water-stopping component due to welding burn-through; the overlapping raised part 21 and the post-pouring strip body 2 are cast in one go, without generating new construction joints, and also eliminating the need for secondary pouring on a thin layer.

[0057] Based on the above specific implementation method, the drainage facility for receiving seepage water can be an existing sump in the basement. The sump is generally located at the lowest elevation of the base slab 1, or it can be combined with a sump pit on the base slab 1. The water guiding component 4 slopes towards the sump with a drainage gradient of not less than 1% along its extension direction, that is, the end of the water guiding component 4 closest to the sump is at a lower elevation, and gradually rises to the far end along the direction of the construction joint 3.

[0058] The seepage water in the water guiding channel 42 flows by gravity down the slope to the collection well without the need for additional power. The drainage slope also prevents the formation of stagnant sections in the water guiding channel 42, avoiding the deposition of fine particles and gradual reduction of the water flow cross-section due to long-term water accumulation. The slope can be 1% to 3%. The end of the water guiding component 4 can be connected to the wall of the collection well via a pre-embedded short pipe or a through-wall sleeve, or it can extend directly into the collection well with the pipe opening higher than the normal water level inside the well.

[0059] The water guiding component 4 on a construction joint 3 can slope down to one side towards a collection well, or it can slope down from the middle to both ends and connect to two collection wells located at both ends of the construction joint 3. The latter arrangement is suitable for cases where the construction joint 3 is long, which can reduce the total elevation difference of the slope on one side, so that the elevations of both ends of the water guiding component 4 still fall within the thickness range of the base plate 1.

[0060] The drainage slope is directly related to the aforementioned second layer of protection: only when the seepage water diverted into the water diversion channel 42 can be continuously drained away can the water diversion channel 42 always maintain the water flow capacity to receive subsequent seepage water; if water accumulates and stagnates in the pipe, the diversion effect of the second layer will be weakened accordingly.

[0061] In one embodiment, see Figure 2 The water-guiding component 4 can be composed of a permeable inner support pipe 43 and a permeable filter cloth 44 covering the outer periphery of the permeable inner support pipe 43. The permeable inner support pipe 43 has a cylindrical outer periphery, and the permeable filter cloth 44 covers its cylindrical outer periphery and is fixed at the overlap. Therefore, the outer peripheral surface of the permeable filter cloth 44 forms the aforementioned convex arc surface 41, which is the surface that directly contacts the concrete on both sides. The permeable inner support pipe 43 and the permeable filter cloth 44 together form a water-filtering and permeable structure, and the interior of the permeable inner support pipe 43 forms a water-guiding channel 42.

[0062] The permeable internal support pipe 43 can be a three-dimensional mesh pipe made of interwoven polymer threads, fused together at the contact points. This pipe is entirely composed of threads and does not have a continuous solid wall; the gaps between the threads are interconnected, forming a pathway for water to enter the pipe from the outer periphery. Simultaneously, the interwoven threads support each other, allowing the pipe to maintain its cross-sectional shape and avoid being flattened under the lateral pressure generated by concrete pouring and vibration, thus preserving the water-conducting channels 42 inside the pipe. The thread material can be polyethylene, and the outer diameter of the pipe can be 80 mm.

[0063] The permeable filter cloth 44 can be made of non-woven fabric. When water permeates through the permeable filter cloth 44, fine particles in the cement slurry and soil particles are blocked from entering the gaps between the threads of the permeable inner support tube 43, thus the water guiding channel 42 is less prone to clogging. In other implementations, the permeable filter cloth 44 can also be made of geotextile or filter mesh.

[0064] The permeable inner support pipe 43 can also be a flexible permeable pipe with a built-in spring steel ring skeleton. In this case, the spring steel ring plays the role of maintaining the cross-sectional shape, and the permeable filter cloth 44 covering it also forms a convex arc surface 41.

[0065] Compared to pipes with a few discrete orifices for water intake, the aforementioned three-dimensional mesh pipe has water intake channels covering the entire outer circumference, resulting in a much larger water intake area per unit length. Furthermore, the location and size of the gaps are randomly distributed, meaning that the blockage of individual gaps does not affect the continued water intake of the remaining gaps. Its outer circumference is a continuous cylindrical surface, which corresponds to the aforementioned construction joint interface 31's movement along the convex arc surface 41. This ensures that chisels will not encounter depressions or sharp edges when sliding along this cylindrical surface.

[0066] In one embodiment, see Figure 3 The waterproof structure may also include multiple positioning brackets 6 spaced apart along the extension direction of the construction joint 3. The water guiding component 4 is connected to the positioning brackets 6, and each positioning bracket 6 is respectively tied to the upper layer steel bar 12 and the lower layer steel bar 13 in the base plate 1.

[0067] The reason for setting up the positioning bracket 6 is that the water guiding component 4 must be in place before the concrete of the base slab 1 is poured. During the pouring and vibration process, the water guiding component 4 will be subjected to the lateral pressure of the concrete and the impact of the vibrator. If its position is not constrained, the embedment elevation and longitudinal slope of the water guiding component 4 will be offset, and the aforementioned layer relationship within the slab thickness range and the drainage slope of not less than 1% will be difficult to maintain. The positioning bracket 6 is integrated with the upper layer steel bar 12 and the lower layer steel bar 13 that have been tied in place, and the water guiding component 4 is constrained by the rigidity of the steel bar skeleton itself. The spacing of the positioning bracket 6 along the extension direction of the construction joint 3 can be taken as 1m.

[0068] In one specific structure, the positioning bracket 6 includes a vertical positioning rib 61 and a horizontal support rib 62 connected to the vertical positioning rib 61. The vertical positioning rib 61 is arranged along the thickness direction of the base plate 1, with its upper end extending to the upper layer reinforcing bar 12 and its lower end extending to the lower layer reinforcing bar 13, and is respectively tied to the upper layer reinforcing bar 12 and the lower layer reinforcing bar 13. The vertical positioning rib 61 passes through the water guiding member 4, that is, its middle part passes through the pipe body of the water guiding member 4. The horizontal support rib 62 is connected to the vertical positioning rib 61 and is located below the water guiding member 4, and the water guiding member 4 is supported on the horizontal support rib 62.

[0069] Two constraints restrict displacement in different directions: the vertical positioning reinforcement 61 passes through the water-guiding component 4, restricting its horizontal movement along the direction perpendicular to the construction joint 3 and along the direction of the construction joint 3; the horizontal support reinforcement 62 supports the lower edge of the water-guiding component 4, restricting its downward settlement under the weight of the concrete and the action of vibration. The water-guiding component 4 is thus locked at the design elevation. The positioning bracket 6 can also have another horizontal reinforcement at the lower layer of reinforcing bars 13, with the lower end of the vertical positioning reinforcement 61 connected to this horizontal reinforcement and tied together with the lower layer of reinforcing bars 13, so that the positioning bracket 6 forms two points of support in the thickness direction of the base plate 1. The vertical positioning reinforcement 61 and the horizontal support reinforcement 62 can be made of ribbed steel bars with a diameter of 8mm.

[0070] The drainage slope can be formed by using positioning brackets 6: along the direction of construction joint 3, change the binding position of the vertical positioning bars 61 and the upper layer of steel bars 12 on each positioning bracket 6, or change the elevation of the horizontal support bars 62 one by one, so that the elevation of the water guiding components 4 at adjacent positioning brackets 6 decreases in sequence, thus obtaining the required drainage slope.

[0071] The vertical positioning rib 61 can be inserted into the water-guiding component 4, which is related to the structure of the permeable inner support pipe 43. When the permeable inner support pipe 43 is a three-dimensional mesh pipe body formed by the aforementioned winding, interlacing, and welding of silk threads, the pipe body does not have a continuous solid wall surface in the cross-section. The vertical positioning rib 61 can be inserted through the gaps between the silk threads without having to make additional holes in the pipe body. The squeezed silk threads rebound on both sides of the reinforcing bar and adhere to its surface, forming a clamp on the vertical positioning rib 61, so that the relative slippage between the water-guiding component 4 and the positioning bracket 6 is not likely to occur. The water passage area lost due to the separation of the silk threads is continued by the still connected gaps around it, so the water passage cross-section of the water-guiding channel 42 is not significantly reduced as a result.

[0072] The vertical positioning rib 61 passes through the water guiding component 4. The permeable filter cloth 44 should be back-covered or separately patched to prevent the cement slurry from entering the water guiding channel 42.

[0073] The positioning bracket 6 can also adopt other structures. For example, it can be composed of pipe clamps and stirrups, with the pipe clamps clamping the outer periphery of the water guiding component 4 and the stirrups supporting it on the lower layer of steel bars 13; or hanging bars can be hung from the upper layer of steel bars 12 to suspend the water guiding component 4; or a pad can be placed on the lower layer of steel bars 13 to support the water guiding component 4, and the thickness of the pad changing along the direction of the construction joint 3 can form a drainage slope.

[0074] In the aforementioned embodiments, there are more than one way to determine the relative position of the water guiding component 4 and the construction joint 3. The common premise is that the construction joint interface 31 is located at the water guiding component 4 and travels around the convex arc surface 41.

[0075] See Figure 1 As shown in the diagram, the axis of the water-guiding component 4 lies within the vertical plane of the construction joint 3. The two halves of the water-guiding component 4 are respectively encased by the pre-poured base slab 1 concrete and the post-poured main body 2 concrete. The interfaces 31 of the construction joints on both sides each circumferentially follow a semi-convex arc surface 41 at this elevation. After the concrete on the pre-poured side has cured, the semi-convex arc surface 41 of the water-guiding component 4 facing the post-poured strip is exposed on the construction joint interface 31. A chisel can be used to clean the surrounding interface by sliding along this semi-convex surface.

[0076] Another approach is an offset arrangement: the water-guiding component 4 is entirely embedded in one side of the pre-cast base slab 1, with only a portion of its convex arc surface 41 exposed at the construction joint interface 31 and in direct contact with the concrete of the post-cast strip body 2. In this case, the arc length of the interface is less than that of the saddle-joint arrangement, but as long as this exposed section of the convex arc surface 41 constitutes a segment of the construction joint interface 31 at that elevation, the interface changes from a plane to a bypass, and the chiseling tool can still slide along it. The degree of offset is limited to the convex arc surface 41 being truly exposed at the construction joint interface 31; if the water-guiding component 4 is completely embedded in the pre-cast concrete and is covered by a layer of concrete, then the construction joint interface 31 at that elevation is still a plane, the angle relationship between the interface and the adjacent structure remains unchanged, and the aforementioned problem of chiseling dead angles cannot be solved.

[0077] In both methods, the water guiding component 4 is located within the thickness range of the base plate 1 and extends along the length direction of the construction joint 3. Its water guiding channel 42 is connected to the construction joint interface 31 through the convex arc surface 41. The relationship of the aforementioned three defenses does not change due to the different methods.

[0078] The foregoing embodiments combined Figures 1 to 3 This section describes the composition and interrelationships of the components in the waterproofing structure of the post-cast strip in the basement floor slab. This waterproofing structure can be formed using the construction process described below for the waterproofing structure of the post-cast strip in the basement floor slab. (See also...) Figure 7 The construction process includes steps S1 to S6. The following only describes the work content of each process, and the composition and coordination of the structure itself will not be repeated. For ease of description, the gap before the concrete of the post-cast strip is poured is called the reserved construction joint, and the joint formed between it and the main body 2 of the post-cast strip after pouring is the aforementioned construction joint. The two refer to the form of the same part at different construction stages.

[0079] Step S1: Install water guiding components with convex arc surfaces and water filtering and permeability structures on the two reserved construction joints along the post-cast strip, and ensure that each water guiding component is within the thickness range of the bottom plate.

[0080] This step is carried out by the construction team during the reinforcement binding stage of the base slab 1. At this time, the lower layer of reinforcement 13 has been in place, the upper layer of reinforcement 12 is being or has been bound, but the concrete of the base slab 1 has not yet been poured. The construction team first marks the position lines of the reserved construction joints on the foundation 9 according to the design drawings, and then sends the water guiding component 4 into the gaps between the reinforcement cages segment by segment along the position lines and aligns it with the position lines. The water guiding component 4 is sent in at this time because it will eventually be embedded within the thickness of the base slab 1, and there will be no room for it to be placed after the concrete is poured.

[0081] After installation, the water-guiding component 4 still needs to be positioned and aligned. The construction team first adjusts its installation elevation so that it falls between the bottom and top surfaces 11 of the base slab 1, typically between the upper reinforcing bars 12 and the lower reinforcing bars 13. Then, following the direction of the reserved construction joint, a line is drawn to straighten the water-guiding component 4 section by section and position it according to the design slope. The reason for controlling the water-guiding component 4 within the slab thickness range is that it must simultaneously meet two conditions: its outer peripheral surface 41 must constitute a section of the construction joint interface 31 at that elevation, and its water-guiding channel 42 must be located along the path of seepage water traveling from bottom to top along that interface. If the water-guiding component 4 falls above the top surface 11 of the base slab 1, the seepage water will have already emerged from the top surface 11 before reaching that elevation; if it falls below the bottom surface of the base slab 1, its outer peripheral surface 41 will no longer constitute a section of the construction joint interface 31, and the interface will remain flat at that point, making it impossible to remove dead corners or cut and arrange water within the joint.

[0082] The outer peripheral surface 41 of the water-guiding component 4 is a convex arc surface, and the tangent at any point on it does not form an inward concave angle with the adjacent concrete. The outer peripheral surface 41 also has a water-filtering and permeable structure, allowing water to pass through while soil particles and fine cement paste particles are blocked. The section of convex arc surface 41 installed in this step will later form a section of the construction joint interface 31 at this elevation. The roughening and cleaning in step S4 is carried out along this surface. Therefore, when positioning, the convex arc surface 41 should be completely placed on the position line and should not be blocked by reinforcing bars or protective layer pads.

[0083] The water guiding components 4 at the two reserved construction joints can be installed together in the same steel reinforcement binding operation; when the bottom plates 1 on both sides are poured in stages and the staggered arrangement is adopted as described later, the water guiding component 4 on the later-poured side is installed together with the steel reinforcement binding of the bottom plate 1 on that side.

[0084] Step S2: Connect the water guiding channels inside each of the water guiding components to the drainage facility.

[0085] After alignment and positioning, the construction team connects the water-guiding channels 42 at both ends of the water-guiding component 4 to the drainage facility. The connection method can be through a pre-embedded short pipe or a through-wall sleeve connected to the side wall of the drainage facility, or by directly inserting the end of the water-guiding component 4 into the drainage facility with the pipe opening higher than the normal water level. Through this connection, the water-guiding channel 42 obtains a normal pressure discharge outlet, allowing seepage water entering through the outer circumferential surface 41 to be continuously discharged without accumulating inside the pipe.

[0086] In step S1, the insertion and positioning of the water guiding component 4 can be completed in the same operation, or it can be roughly positioned first and then finely adjusted section by section; the connection in step S2 can be carried out immediately after the positioning and positioning, or it can be postponed until before the concrete pouring of the bottom plates 1 on both sides. This embodiment of the invention does not limit this.

[0087] Step S3: Set up pouring partitions at the two reserved construction joints respectively, and pour concrete for the bottom slabs on both sides.

[0088] The erection of the pouring partition is carried out after the water-guiding component 4 is in place and has passed concealed acceptance. The construction party erects the pouring partition along the reserved construction joint line to separate the post-pouring strip area from the pouring area of ​​the two side base slabs 1. The pouring partition should be attached to the outer circumference 41 of the water-guiding component 4 to prevent the grout from flowing into the post-pouring strip area from the gap between the partition and the water-guiding component 4, and also to ensure that the concrete on both sides is tightly attached to the outer circumference 41 at this point. After the erection is completed, the construction party pours the concrete of the two side base slabs 1 respectively and vibrates it to compact it. The pouring partition can be made of wire mesh or sealing mesh tied to the reinforcing steel skeleton, or it can be made of wooden formwork, plastic sealing strips, or other components that can be sealed along the position line and can be removed afterwards.

[0089] During pouring and vibration, the water-guiding component 4 bears the lateral pressure of the concrete and the impact of the vibrator. Therefore, the vibrator should not directly contact the water-guiding component 4. The pipe openings at both ends of the water-guiding component 4 that connect to the drainage facility can be temporarily sealed first. After the concrete of the subsequent pouring strip is completed, the pipe openings can be opened and water can be passed through for inspection to prevent grout from flowing back from the pipe openings and reducing the water passage cross-section of the water-guiding channel 42. Of course, whether to set up such temporary sealing and what kind of sealing method to use are not limited in this embodiment of the invention.

[0090] Step S4: After the concrete of each side of the base plate has cured, remove the pouring partition corresponding to that side, and roughen and clean the construction joint interface on that side along the convex arc surface.

[0091] Once the concrete of each side of the base slab 1 has cured to the point where it is ready for removal, the corresponding pouring partition on that side can be removed from the post-pouring strip side, exposing the construction joint interface 31 on that side. The morphology at this stage is shown in [reference needed]. Figure 4 Then, the interface is roughened and cleaned section by section with a chisel. When the two interfaces are treated together after their respective base plates 1 have been cured, the upper layer of steel bars 12 and the lower layer of steel bars 13 of the base plate 1 have been tied. The chisel is inserted obliquely downward from above the post-cast strip, and its swing angle is constrained by the steel bars.

[0092] Because the outer peripheral surface 41 of the water-guiding component 4 is a convex arc surface, the construction joint interface 31 does not break into two right-angled planes at this point, but rather continuously wraps around the outer peripheral surface 41. The end of the device can thus slide along the tangent direction of this arc surface, and the contact point moves continuously on the arc surface as the insertion angle changes. There are no positions on the interface that the device cannot reach. In contrast, in the prior art, when a flat water-stop component is embedded at the same location, its plate surface intersects perpendicularly with the construction joint interface, forming a concave right-angled angle. With the upper reinforcing steel already tied and the device restricted from insertion from above, the end of the device cannot enter the root of this angle, leaving laitance and slag on the interface, which will later seep water along it. After the above-mentioned roughening and cleaning, the construction joint interface 31 becomes a clean and rough bonding surface, allowing the concrete poured in step S5 to bond tightly with it.

[0093] Step S5: Pour concrete between the two base plates to form a post-pouring strip body and an overlapping raised part. The overlapping raised part is higher than the top surface of the two base plates and extends across the reserved construction joint to the top surface of the two base plates.

[0094] The pouring within the post-pouring strip area is carried out after the construction joint interface 31 has been roughened, cleaned, and inspected. This pouring is completed continuously along the thickness direction of the base slab 1 in one go, without leaving any horizontal joints in between. The concrete first fills the space between the two base slabs 1 to form the main body 2 of the post-pouring strip, and then overflows over the top surface 11 of the base slab 1, crosses the two reserved construction joints, and overlaps the top surfaces 11 of the two base slabs 1, forming an overlapping raised section 21 that is integrated with the main body 2 of the post-pouring strip. The final shape is as follows: Figure 5 As shown. The segmented joints along the length of the post-cast strip are determined according to the construction organization and are not subject to the above restrictions.

[0095] The overlapping raised section 21 and the main body 2 of the post-pouring strip are formed in one step instead of being poured in two separate pours. This avoids the formation of a new joint between the two, and the thickness of the part of the overlapping raised section 21 that protrudes above the top surface 11 of the base slab 1 is limited. If it were poured separately as a thin layer in two separate pours, it would be easily damaged in subsequent operations. After the overlapping raised section 21 covers the top surface 11 of the base slab 1, the construction joint 3 that was originally exposed directly at the top surface 11 is no longer exposed in place. Its exposure position is moved to the outer periphery of the overlapping raised section 21, which is the exposed joint opening 32. If water seepage is to reach the indoor side, it must first turn to a horizontal direction from the top of the construction joint 3, and travel along the joint between the bottom surface of the overlapping raised section 21 and the top surface 11 of the base slab 1 to the exposed joint opening 32. The journey is longer than the original vertical path that penetrates the thickness of the slab.

[0096] Step S6: Cover the exposed seam between the lapped raised portion and the top surface of the bottom plate on both sides with a sealing and waterproofing layer, so that the sealing and waterproofing layer extends from the exposed seam to the top surface of the bottom plate on the corresponding side.

[0097] The sealing of the exposed joint 32 is arranged after the concrete of the main body 2 of the post-cast strip has reached the design strength and the surface is ready for operation. The construction party first removes the floating dust, oil stains and loose materials from the exposed joint 32 and the base surface on both sides and dries the base surface. Then, a sealing waterproof layer 5 is covered at the exposed joint 32, extending from the exposed joint 32 to the top surface 11 of the corresponding side bottom plate 1 with an overlap width, closely adhering to the top surface 11 of the bottom plate 1 without leaving any voids. The closing shape is shown in the figure. Figure 6 The sealing waterproof layer 5 can also be flipped up from the exposed joint 32, extending upwards along the outer periphery of the overlapping raised portion 21, and then continuing to extend a section on the top surface of the overlapping raised portion 21, thus straddling the exposed joint 32. At this point, the aforementioned waterproof structure of the post-pouring strip of the basement floor slab is completed.

[0098] It should be noted that the above description is only one possible operational arrangement for this process, and not all of them are possible.

[0099] The main advantage of the above construction process is that the construction joint interface 31 can be treated as comprehensively as possible. Existing technology embeds a flat, water-stopping component within the joint. The concave right angle formed by the perpendicular intersection of the plate surface and the interface falls precisely at a position inaccessible to the chisel due to the obstruction of the upper reinforcing steel. The laitance and slag remaining at this location form a continuous seepage channel. This process replaces this with a water-guiding component 4 at the same location, with a convex arc surface on its outer perimeter. This transforms the interface from a planar intersection to a flow around the arc surface. In step S4, the tool can slide tangentially without dead angles, allowing for the thorough removal of laitance and slag from the interface. This results in a dense bond between the pre-poured and post-poured concrete, weakening the interface's own permeability. The pouring partition erected in step S3 also plays a role here: it conforms to the outer perimeter 41, and the concrete on both sides is thus formed precisely against this arc surface, allowing the shape of the flowing interface to be determined during the pouring stage.

[0100] Based on this, the outer peripheral surface 41 of the same water-guiding component 4, which performs the aforementioned surface function, is also the entrance for seepage water to enter the water-guiding channel 42. All seepage water traveling up the interface to this elevation encounters the outer peripheral surface 41 and the water-guiding channel 42, whose water-carrying capacity is much greater than that of the interface gap. Most of this water can be diverted and discharged through the drainage facilities connected in step S2. In other words, the interface treatability and the interception and drainage within the gap are provided by the same component, rather than being two separate measures.

[0101] Furthermore, step S5 forms the main body 2 of the post-pouring strip and the overlapping raised part 21 in one pour, which not only avoids adding a joint between the two, but also eliminates the need for the thin-layer secondary pouring process of fine stone concrete embankment and crack-resistant layer in the prior art. The problem of such thin layer being easily damaged in subsequent operations is thus resolved. After step S6 seals the exposed joint 32, the small amount of seepage water traveling up the interface loses its place to be exposed on the spot, and instead flows more into the water guiding channel 42. The aforementioned diversion ratio is thus increased. The water guiding channel 42 is discharged at normal pressure through the drainage facility, and the joint section above its elevation no longer accumulates water pressure. The water head borne by the sealing waterproof layer 5 is reduced accordingly, and the risk of it being pushed open or peeled off is also reduced.

[0102] Furthermore, since this process replaces the flat water-stopping component in the joint with the water-guiding component 4, it is no longer necessary to weld and fix it in areas with dense steel reinforcement. The potential danger of leaving holes in the water-stopping component due to welding burn-through and water seepage due to this, as in the existing technology, is also eliminated.

[0103] In one embodiment, the water-guiding component installed in step S1 and the drainage facility connected in step S2 can have the following specific forms. The water-guiding component 4 includes a permeable inner support tube 43 with a cylindrical outer periphery and a permeable filter cloth 44 covering the outer periphery of the permeable inner support tube 43. The outer peripheral surface of the permeable filter cloth 44 forms a convex arc surface 41, and its structure and covering method have been described above. Figure 2 As explained, the drainage system utilizes the existing sump in the basement, with the water guiding component 4 sloping towards the sump at a gradient of not less than 1% along its extension direction.

[0104] Setting a drainage slope allows seepage water entering the water guide channel 42 to flow to the collection well by its own gravity without requiring additional power, while preventing the formation of stagnant sections within the pipe that would accumulate fine particles over long-term use. The slope can be 1% to 3%. During construction, the slope is formed by the segmental correction in step S1: along the direction of the reserved construction joint, the elevation of the end of the water guide component 4 closest to the collection well is lower, gradually rising towards the far end. The total elevation difference should be controlled so that both ends of the water guide component 4 still fall within the thickness range of the base plate 1. If the construction joint 3 is long and the total elevation difference of the slope on one side exceeds this range, it can be sloped from the middle towards both ends, connecting to the two collection wells located at both ends of the construction joint 3; if the joint length is even greater, it can also be sloped in segments along the joint length towards multiple drainage facilities.

[0105] In one embodiment, in step S1 above, the insertion and elevation correction of the water guiding component 4 can be completed with the help of the positioning bracket 6, which is divided into steps S11 and S12.

[0106] Step S11: Install multiple positioning brackets at the two reserved construction joints respectively, and tie each positioning bracket to the upper and lower reinforcing bars of the base plate respectively.

[0107] The construction team erects positioning supports 6 one by one along the reserved construction joint line at predetermined intervals, with a spacing of 1m. After each support is erected, it is tied to the upper layer of reinforcing bars 12 and the lower layer of reinforcing bars 13 within the base slab 1, allowing the positioning support 6 to gain rigidity using the already positioned reinforcing bar skeleton. The specific structure of the positioning support 6 and the connection relationship between the vertical positioning bars 61 passing through the water-guiding component 4 and the horizontal support bars 62 supporting the water-guiding component 4 are described above. Figure 3 Explanation.

[0108] Step S12: Support the water guiding component on each of the positioning brackets and fix it, and control the drainage slope of the water guiding component along its extension direction by adjusting the support elevation of each of the positioning brackets.

[0109] The water-guiding components 4 are then placed and fixed section by section onto each positioning bracket 6. After fixing, the support elevation of each positioning bracket 6 is changed one by one along the direction of the reserved construction joint, so that the elevation of the water-guiding components 4 at adjacent positioning brackets 6 decreases sequentially. The water-guiding components 4 are then erected to the required drainage slope and locked in that position. Changing the support elevation can move the binding position of the vertical positioning reinforcement 61 and the upper layer reinforcement 12, or it can change the connection height of the horizontal support reinforcement 62 on the vertical positioning reinforcement 61. Where the vertical positioning reinforcement 61 passes through the water-guiding components 4, the permeable filter cloth 44 should be back-covered or separately patched to prevent this area from becoming a passage for cement slurry to enter the water-guiding channel 42.

[0110] After the positioning bracket 6 assumes the positioning, the water guiding component 4 no longer relies on manual temporary support to maintain its position during the pouring and vibration in step S3. Its embedment elevation and drainage slope remain unchanged before the initial setting of the concrete. Therefore, the slab thickness layer relationship and the aforementioned self-flowing conditions required in step S1 still hold true in the finished product.

[0111] In one embodiment, when the bottom plates 1 on both sides are poured in stages, the pouring interruption set in step S3 and the roughening and cleaning along the convex arc surface in step S4 can be staggered and performed at different times. The staggered arrangement will be described below according to steps S31 to S42.

[0112] Step S31: Tie wire mesh at each of the two reserved construction joints as pouring barriers.

[0113] The construction team ties wire mesh along the reserved construction joint line to serve as a pouring partition. The wire mesh extends from the bottom surface of the base slab 1 to the top surface 11, and wraps around and adheres to the outer circumference 41 of the water-guiding component 4. The wire mesh can be directly tied to the reinforcing steel frame and positioning bracket 6 of the base slab 1. The mesh can usually allow water in the grout to pass through while retaining aggregate, so the subsequently poured concrete can form close to the wire mesh. The interface obtained after removing the mesh is relatively rough.

[0114] Step S41: The concrete of the bottom slabs on both sides is poured in stages. After the concrete of the bottom slab on the first side is cured, and before the reinforcement of the bottom slab on the other side is tied, the corresponding wire mesh on that side is removed, and the construction joint interface on that side is roughened and cleaned along the convex arc surface.

[0115] When the concrete curing of one side of the base slab 1 is completed, the reinforcing bars of the other side of the base slab 1 have not yet been tied. The upper part of that side is open, and tools can be used to approach the interface of the first-poured side from that side at an angle. The working surface is wider than when the reinforcing bars on both sides are complete. Taking advantage of this time, the construction team first removes the wire mesh at the construction joint 3 on that side, and then roughens and cleans the interface 31 of the construction joint on that side along the convex arc surface 41 of the water guide member 4 towards the post-pouring strip. Even during this time, the bypass interface formed by the convex arc surface 41 of the water guide member 4 avoids the concave right angle formed by the flat water stop member at the same position, and the roughening can be completed in one go without having to repeatedly change the angle to enter the root of the angle.

[0116] Step S42: After the concrete of the other side base plate is poured and cured, remove the wire mesh corresponding to that side, and roughen and clean the construction joint interface on that side along the convex arc surface.

[0117] After the reinforcement of the bottom slab 1 on the other side is tied, and the concrete on that side is poured and cured, the remaining interface on that side is then treated. The construction team removes the wire mesh at the construction joint 3 on that side and roughens and cleans the interface on that side. When working on this side, the reinforcement on both sides is already in place, and the tool is inserted obliquely downwards from above the post-cast strip. A chisel with an extended drill rod can be used to reach the interface under the bottom slab 1. Because the working conditions on this side are limited, the dead-angle-free characteristic of the convex arc surface 41 of the water guiding component 4 is particularly important here—the tool can cover the entire interface around the component by sliding along the tangent of the arc surface, without having to change angles to enter a certain angle.

[0118] The aforementioned staggered arrangement allows one side of the interface to be processed during a period with ample working conditions, while the other side is completed under limited conditions using the convex arc surface 41. Thus, the cleaning of each interface is carried out under conditions suitable to that specific interface. Of course, both interfaces can also be processed together after the respective base plates 1 have been cured, without affecting the implementation of this embodiment of the invention.

[0119] In this embodiment, the one-time molding of the post-pouring strip body and the overlapping raised part in step S5 can be carried out in three processes from step S51 to step S53 for edge finishing and curing.

[0120] Step S51: After roughening and cleaning the interface of the construction joint, fix the edge finishing template at the preset distance between the top surface of the bottom plate on both sides and the reserved construction joint on the corresponding side.

[0121] The forming boundary of the overlapping raised section 21 is enclosed by two edge trimming templates 10. After the interface is roughened and cleaned and inspected, an edge trimming template 10 is fixed on the top surface 11 of the base plate 1 on both sides at a predetermined distance from the corresponding side's reserved construction joint. This predetermined distance is the width of the overlapping raised section 21 that will overlap the top surface 11 of the base plate 1, which can be 100mm; the height of the edge trimming template 10 is the height of the overlapping raised section 21 above the top surface 11, which can be 20mm. The edge trimming template 10 can be made of 40mm×20mm cross-section timber and fixed to the top surface 11 of the base plate 1 with cement nails, or it can be made of steel, plastic trimming strips, or non-removable trimming strips. The two edge trimming templates 10 and the top surface 11 of the base plate 1 together form the forming boundary of the overlapping raised section 21.

[0122] Step S52: Continuously pour micro-expansion concrete between the two edge-finishing templates until it is flush with the top surface of the edge-finishing templates.

[0123] The construction team continuously pours micro-expansion concrete between the two edge-finishing formwork 10, filling the space between the two bottom slabs 1 in one go and overflowing the top surface 11 of the bottom slab 1 until it is flush with the top surface of the edge-finishing formwork 10, and then immediately finishes the surface. The micro-expansion of the concrete during the hardening process can compensate for its own shrinkage, reduce the interface cracking caused by shrinkage between the main body 2 of the post-pouring strip and the two bottom slabs 1, and maintain the bond on the rough interface obtained in step S4.

[0124] Step S53: Remove the edge trimming template and cover the micro-expansion concrete for moisture retention and curing.

[0125] Once the concrete has initially set and is ready for demolding, the two edge formwork panels 10 can be removed, and the outer perimeter of the overlapping raised section 21 will then be formed. Simultaneously, the exposed joint 32 between the raised section and the top surface 11 of the base slab 1 will become visible, allowing the sealing and waterproofing layer 5 to be applied in step S6. After demolding, the micro-expansion concrete should be covered and kept moist for curing. Curing can be achieved by covering with non-woven fabric and sprinkling water, or by covering with a film or applying a curing agent.

[0126] The following example, using the expansion joint of a newly constructed basement floor slab, further illustrates the above construction process. The completed node form in this scenario is shown in [reference needed]. Figure 1 For the work process, please refer to [link / reference]. Figure 7 .

[0127] The basement floor slab 1 is 350mm thick. Beneath the bottom surface of floor slab 1, a waterproof membrane 8 and a 100mm thick C20 plain concrete pad 9 are laid sequentially. In the section where the post-cast strip is located, the waterproof membrane 8 and pad 9 partially sink and extend 300mm outwards from the reserved construction joint on both sides. The post-cast strip is 800mm wide, and this value represents the distance between the two reserved construction joints.

[0128] During the reinforcement binding stage of the foundation slab 1, the construction team installed a water-guiding component 4 along the reserved construction joint line on the side to be poured first. This water-guiding component 4 consists of a permeable inner support pipe 43 with an outer diameter of 80mm, formed by interlacing and welding polyethylene threads, and a non-woven fabric covering its outer perimeter, which is a permeable filter cloth 44. A positioning bracket 6 is erected every 1m along the joint, with its vertical positioning ribs 61 passing through the water-guiding component 4 and tied to the upper layer reinforcement 12 and the lower layer reinforcement 13 respectively. Horizontal support ribs 62 support its bottom. The support elevation of each positioning bracket 6 is adjusted one by one to create a 1% drainage slope along the joint of the water-guiding component 4, sloping towards the nearest collection well at the end of the construction joint 3 and connected via a pre-embedded short pipe. The pipe openings at both ends of the water-guiding component 4 are temporarily sealed before pouring.

[0129] Subsequently, wire mesh is tied along the reserved construction joint as a pouring partition, and concrete is poured for the first side of the base slab 1. When the curing of this side is completed but the reinforcement of the other side has not yet been tied, the wire mesh on this side is removed and the interface on this side is roughened and cleaned along the convex arc surface 41 of the water guide component 4. Then the reinforcement of the other side of the base slab 1 is tied, and the water guide component 4, positioning bracket 6 and wire mesh on this side are installed in the same way, and concrete is poured on this side; after curing, the wire mesh on this side is removed with a chisel with an extended drill rod, and the interface on the convex arc surface 41 is roughened and cleaned in the same way.

[0130] After the interface on both sides is cleaned and inspected, a 40mm×20mm cross-section wooden strip is fixed with cement nails at a position 100mm away from the reserved construction joint on the top surface 11 of the bottom plate 1 on both sides as an edge finishing template 10. Micro-expansion concrete is poured in one go between the two wooden strips to form the main body 2 of the post-pouring strip and the overlapping raised part 21 that is 20mm higher than the top surface 11 and overlaps 100mm on both sides. After pouring, the surface is immediately finished and covered with non-woven fabric and watered for curing. At the same time, the pipe openings of the two water guiding components 4 are opened and water is passed through to check and confirm that the water guiding channel 42 is unobstructed. After the concrete is ready for demolding, the construction team removes the timber and continues to cover and moisturize it. After reaching the design strength, the base surface on both sides of the exposed joint 32 is cleaned and coated with non-curing rubber asphalt waterproof coating as a sealing waterproof layer 5. Extending 250mm from the exposed joint 32 to the top surface 11 of the base plate 1, and after flipping up the outer perimeter of the overlapping raised part 21 from the joint, it extends inward on its top surface to 250mm from the reserved construction joint line, forming a sealing waterproof layer 5 with a width of about 600mm on each side, straddling the exposed joint 32.

[0131] The above values ​​are examples given in combination with the slab thickness, post-cast strip width and groundwater conditions in this scenario. Those skilled in the art can determine them separately according to actual engineering conditions, and they do not constitute a limitation on the present invention.

[0132] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A waterproof structure for a post-cast strip in a basement floor slab, comprising two floor slabs on both sides and a post-cast strip body located between the two floor slabs, wherein construction joints are formed between the post-cast strip body and the two floor slabs on both sides, characterized in that, The waterproof structure also includes: A water-guiding component is provided along the construction joints on both sides within the thickness range of the base plate. The outer peripheral surface of the water-guiding component is a convex arc surface and has a water-filtering and water-permeable structure. The construction joint interface between the base plate on both sides and the main body of the post-cast strip extends along the convex arc surface at the water-guiding component. The water-guiding component is provided with a water-guiding channel extending along its extension direction. The water-guiding channel communicates with the construction joint interface through the outer peripheral surface and is connected to the drainage facility. The overlapping raised part is integrally formed on the top of the post-pouring strip body, and the overlapping raised part is higher than the top surface of the bottom plate on both sides and extends across the construction joint on both sides to the top surface of the bottom plate on both sides. A sealing and waterproofing layer covers the exposed joint of the construction joint between the lapped raised portion and the base plates on both sides, and extends from the exposed joint to the top surface of the corresponding base plate.

2. The waterproof structure for the post-cast strip of the basement floor slab according to claim 1, characterized in that, The drainage facility is a water collection well, and the water guiding component slopes toward the water collection well along its extension direction at a drainage slope of not less than 1%.

3. The waterproof structure for the post-cast strip of the basement floor slab according to claim 1, characterized in that, The water guiding component includes a water-permeable inner support tube with a cylindrical outer periphery and a water-permeable filter cloth covering the outer periphery of the water-permeable inner support tube. The outer peripheral surface of the water-permeable filter cloth forms the convex arc surface. The water-permeable inner support tube and the water-permeable filter cloth together form the water filtration and permeability structure. The interior of the water-permeable inner support tube forms the water guiding channel.

4. The waterproof structure for the post-cast strip of the basement floor slab according to claim 1, characterized in that, The waterproof structure also includes a plurality of positioning brackets spaced apart along the extension direction of the construction joint. The water guiding component is connected to the positioning brackets, and the positioning brackets are respectively tied to the upper and lower reinforcing bars in the base plate.

5. The waterproof structure for the post-cast strip of the basement floor slab according to claim 4, characterized in that, The positioning bracket includes a vertical positioning rib and a horizontal support rib connected to the vertical positioning rib. The vertical positioning rib passes through the water guiding component and is respectively tied to the upper and lower reinforcing bars in the bottom plate. The water guiding component is supported by the horizontal support rib.

6. A construction process for a waterproof structure of a post-cast strip in a basement floor slab, applicable to the waterproof structure of a post-cast strip in a basement floor slab as described in any one of claims 1 to 5, characterized in that, The construction process includes the following steps: S1. Install water guiding components with convex arc surfaces and water filtering and permeability structures on the two reserved construction joints along the post-cast strip, and ensure that each water guiding component is within the thickness range of the bottom plate. S2. Connect the water guiding channels inside each of the water guiding components to the drainage facilities; S3. Set up pouring partitions at the two reserved construction joints respectively, and pour concrete for the bottom slabs on both sides. S4. After the concrete of each side of the base plate has cured, remove the pouring partition corresponding to that side, and roughen and clean the construction joint interface on that side along the convex arc surface. S5. Concrete is poured between the two bottom plates to form a post-pouring strip body and an overlapping raised part. The overlapping raised part is higher than the top surface of the two bottom plates and extends across the reserved construction joint to the top surface of the two bottom plates. S6. Cover the exposed seam between the lapped raised portion and the top surface of the bottom plate on both sides with a sealing and waterproofing layer, so that the sealing and waterproofing layer extends from the exposed seam to the top surface of the bottom plate on the corresponding side.

7. The construction process according to claim 6, characterized in that, The water guiding component includes a permeable inner support pipe with a cylindrical outer periphery and a permeable filter cloth covering the outer periphery of the permeable inner support pipe, the outer peripheral surface of the permeable filter cloth forming the convex arc surface; the drainage facility is a water collection well, and the water guiding component slopes towards the water collection well along its extension direction at a drainage slope of not less than 1%.

8. The construction process according to claim 6, characterized in that, In step S1, multiple positioning brackets are installed at the two reserved construction joints, and each positioning bracket is tied to the upper and lower reinforcing bars of the base plate. The water guiding component is supported on each positioning bracket and fixed, and the drainage slope of the water guiding component along its extension direction is controlled by adjusting the support elevation of each positioning bracket.

9. The construction process according to claim 6, characterized in that, Steps S3 and S4 include: binding wire mesh at the two reserved construction joints as pouring barriers; pouring concrete for the base slabs on both sides in stages; after the concrete of the first side of the base slab has cured and before the reinforcement of the other side of the base slab is tied, removing the corresponding wire mesh on that side and roughening and cleaning the construction joint interface on that side along the convex arc surface; after the concrete of the other side of the base slab has been poured and cured, removing the corresponding wire mesh on that side and roughening and cleaning the construction joint interface on that side along the convex arc surface.

10. The construction process according to claim 6, characterized in that, Step S5 includes: after roughening and cleaning the interface of the construction joint, fixing the edge-finishing templates at a preset distance from the top surface of the bottom plate on both sides to the corresponding side of the reserved construction joint; continuously pouring micro-expansion concrete between the edge-finishing templates on both sides until it is flush with the top surface of the edge-finishing templates; removing the edge-finishing templates and covering the micro-expansion concrete for moisture retention and curing.

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