Bottom plate water leakage blocking method before post-cast strip sealing

Abstract

The invention discloses a bottom plate water leakage plugging method before post-cast strip sealing, which can plug a leakage source of a waterproof layer before post-cast strip construction, prevents the leakage source from continuously seeping water to generate a plurality of leakage lines in a post-cast strip structure, and reduces the subsequent leakage stoppage difficulty and leakage stoppage workload of the post-cast strip. The method comprises the steps that a leakage source on a waterproof layer is checked and marked at the position of a post-cast strip between two bottom plates; a casing pipe is arranged at the position of each leakage source, the casing pipes cover the leakage sources, and the casing pipes are connected with the steel bar frame on the top layer; the post-cast strip is poured with concrete which is one grade higher than the concrete of the bottom plate, and the casing pipe is pre-embedded into the concrete of the post-cast strip; after the concrete of the post-cast strip reaches the design strength, a plugging groove is formed in the position of the sleeve in a chiseling mode, and after the depth of the plugging groove reaches the preset depth, the sleeve is cut off; and pouring the plugging groove by adopting expansion anti-seepage concrete which is one grade higher than the concrete of the post-cast strip to form a plugging layer, and the like.

Description

Technical Field

[0001] The invention relates to the technical field of building engineering, and in particular to a method for sealing water leakage from a bottom plate before a post-cast strip is closed. Background Art

[0002] In building construction, in order to prevent harmful cracks in cast-in-place reinforced concrete structures due to factors such as temperature, uneven settlement, and uneven settlement, construction joints are usually left at corresponding positions of foundation slabs, walls, beams, etc. in accordance with design or construction specifications. The overall structure is divided into several parts. After internal shrinkage of the components, concrete is poured in the construction joints to form post-cast joints to connect the structure into a whole. The waterproof sealing of the post-cast joints is the top priority in basement slab waterproofing.

[0003] At present, the waterproofing of the post-cast joint is usually carried out in the following ways: before constructing the post-cast joint, a waterproof layer and a waterproof reinforcement layer are set on the cushion layer, a water-stop steel plate is set at the junction of the side of the bottom plate concrete and the post-cast joint concrete, and then the post-cast joint concrete is poured; or before constructing the post-cast joint, a waterproof layer and a waterproof reinforcement layer are set on the cushion layer, an advance waterstop is set on the waterproof layer and the waterproof reinforcement layer, and then the post-cast joint concrete is poured.

[0004] The waterproof designs of the above two construction methods are both a waterproof layer and a waterproof reinforcement layer. The waterproof layer is arranged on the waterproof reinforcement layer. The waterproof layer generally adopts waterproof membrane, etc. In actual construction, the post-casting strip needs to be constructed after the main structure is closed, and the shelving time is relatively long. The waterproof membrane is easily damaged and failed due to factors such as the settlement of the main structure, the action of groundwater pressure, poor sealing at the joints, loose bonding with the cushion layer, and bottom plate construction, resulting in a leakage source at the position of the post-casting strip. Under the influence of the upward water pressure of the groundwater, the water at the leakage source continuously flows out, affecting the pouring quality of the post-casting strip concrete; after the groundwater leaks from the leakage source, it will also continue to erode the concrete that has been poured but not completely solidified. After the concrete of the post-casting strip solidifies, many leakage lines will appear in the post-casting strip structure, resulting in many leakage points on the surface of the post-casting strip. After the known leakage points of the post-casting strip are blocked, there will still be other leakage points along the leakage line that have not yet leaked to the surface of the post-casting strip, which increases the subsequent difficulty and workload of plugging. Summary of the invention

[0005] At least one of the purposes of the present invention is to provide a method for sealing water leakage from the bottom plate before the post-cast strip is closed, aiming at overcoming the problems existing in the above-mentioned prior art. Before the construction of the post-cast strip, the leakage source of the waterproof layer can be sealed to avoid continuous water seepage from the leakage source to produce multiple leakage lines in the post-cast strip structure, thereby reducing the difficulty and workload of subsequent plugging of the post-cast strip.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention includes the following aspects.

[0007] A method for sealing water leakage from a bottom plate before a post-cast strip is closed comprises the following steps: Step 1: Investigate the leakage source on the waterproof layer at the post-casting strip between the two bottom plates and mark the location of the leakage source; Step 2: Set a casing at the location of each leakage source, so that the casing covers the leakage source, and the casing is connected to the top steel frame; Step 3: Use concrete of a higher grade than the base plate concrete to cast the post-casting strip, and embed the casing in the concrete of the post-casting strip; Step 4: After the concrete of the post-casting zone reaches the designed strength, a plugging groove is chiseled at the location of the casing, and after the depth of the plugging groove reaches the preset depth, the casing is cut off; Step 5: Use expansive anti-seepage concrete of a higher grade than the concrete of the post-cast zone to cast the plugging groove to form a plugging layer.

[0008] Preferably, in the step one, the leakage source on the waterproof layer is checked, and marking the location of the leakage source includes: laying a layer of fine sand at the location where water seepage occurs on the waterproof layer, observing whether water seepage holes appear on the fine sand, the location where the water seepage holes appear is the location of the leakage source, using a wooden stick or a steel bar to pass through the top steel frame, so that the wooden stick or the steel bar extends to the location of the water seepage hole, and then tying the wooden stick or the steel bar to the top steel frame to mark the location of the leakage source.

[0009] Preferably, the step two specifically includes: removing the binding marks on the top-level steel frame, vertically inserting the casing into the position of the leakage source, abutting against the surface of the waterproof layer, and after the casing covers the leakage source, binding or welding the casing to the top-level steel frame; the part of the casing extending out of the bottom plate is bent and horizontally fixed on the bottom plate, and extends along the bottom plate to the position of the sump, and is connected to the water pump in the sump.

[0010] Preferably, in the step 2, before the sleeve is provided, a filter screen is provided at the bottom of the sleeve.

[0011] Preferably, in step 4, when the sleeve is cut off, the top of the cut sleeve is made to extend 3 to 5 cm beyond the bottom surface of the sealing groove.

[0012] Preferably, in step five, before pouring the sealing groove, the casing is filled with swelling water-stop rubber.

[0013] Preferably, the bottom of the swelling waterproof rubber extends to the bottom of the casing, and when the swelling waterproof rubber is filled to 2-6 cm close to the top of the casing, the swelling waterproof sealing paste is filled in the casing.

[0014] Preferably, before pouring the sealing groove, a connection joint is welded at the top of the casing, and then a water stop cap is welded on the connection joint.

[0015] Preferably, one or more annular water-stopping joints are provided in the length direction of the sleeve, and the water-stopping joints are welded to the sleeve.

[0016] Preferably, the casing is a steel casing with a nominal diameter not less than 15 mm.

[0017] In summary, due to the adoption of the above technical solution, the present invention has at least the following beneficial effects: The present invention can effectively block the leakage source caused by the damage of the waterproof layer, avoid the continuous water seepage from the leakage source affecting the casting quality of the post-casting strip from the source, and avoid the generation of multiple leakage lines in the post-casting strip due to the water seepage from the leakage source. Compared with the later blocking of multiple leakage lines of the post-casting strip, blocking from the leakage source greatly reduces the difficulty and workload of blocking. By setting a casing with a water stop joint, after the casing covers the leakage source, the water seeping from the leakage source can be led out of the casing. Before or during the casting of the concrete of the post-casting strip, the water seeping from the leakage source can be prevented from contacting with the concrete, thereby effectively avoiding the generation of leakage lines in the post-casting strip.

[0018] After the post-cast strip is poured, a sealing groove is chiseled at the position of the casing. After the casing is cut off, the casing is filled with expanding water-stop rubber, and the sealing groove is filled with anti-seepage concrete of a higher grade than the concrete of the post-cast strip. This can effectively seal the casing and further improve the anti-leakage ability of the post-cast strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure for blocking water leakage from the front bottom plate after the post-cast strip is closed according to an exemplary embodiment of the present invention.

[0020] Figure 2 It is a schematic diagram of the water leakage blocking structure of the front bottom plate after the post-cast strip is closed according to another exemplary embodiment of the present invention.

[0021] Figure 3 It is a schematic diagram of arrangement of the sleeve in the post-casting zone according to an exemplary embodiment of the present invention.

[0022] Figure 4 It is an enlarged schematic diagram of the connection between the water stop cap and the connecting joint according to an exemplary embodiment of the present invention.

[0023] Figure 5 It is a flow chart of sealing water leakage from the bottom plate before closing the post-cast strip according to an exemplary embodiment of the present invention.

[0024] Markings in the figure: 1- cushion layer, 2- waterproof layer, 3- post-cast strip, 4- leakage source, 5- casing, 6- sealing layer, 7- water stop joint, 8- expansion water stop rubber, 9- top steel frame, 10- bottom steel frame, 11- reinforced steel layer, 12- connection joint, 13- water stop cap, 14- waterproof reinforcement layer. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments to make the purpose, technical solutions and advantages of the present invention more clearly understood. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] like Figure 1 As shown, the water leakage blocking structure of the front bottom plate sealed by the post-cast strip of an exemplary embodiment of the present invention includes a cushion layer 1, a waterproof layer 2, a post-cast strip 3, a casing 5 and a blocking layer 6, wherein the waterproof layer 2 is arranged on the cushion layer 1, the post-cast strip 3 is arranged on the waterproof layer 2, the casing 5 is vertically arranged in the post-cast strip 3, the bottom of the casing 5 extends to the position of the leakage source 4 on the waterproof layer 2, the bottom of the casing 5 contacts the waterproof layer 2, the top of the casing 5 extends into the blocking layer 6, the blocking layer 6 is embedded in the post-cast strip 3, and the top surface of the blocking layer 6 is flush with the top surface of the post-cast strip 3.

[0027] After the casing 5 is arranged at the position of the leakage source 4 of the waterproof layer 2, before and during the pouring of the concrete of the post-casting strip 3, the water seeping from the leakage source 4 can be led out through the casing 5 to prevent the seeping groundwater from affecting the concrete pouring quality of the post-casting strip 3. During the solidification process of the concrete of the post-casting strip 3 after the pouring is completed, the casing 5 can prevent the leakage source 4 from directly contacting the concrete of the post-casting strip 3, and can prevent the concrete of the post-casting strip 3 from forming multiple leakage lines from the leakage source 4 to the concrete under the action of the groundwater pressure, thereby avoiding the occurrence of multiple leakage points on the surface of the post-casting strip 3, improving the construction quality of the post-casting strip 3, and reducing the difficulty and workload of plugging the leakage points in the later stage.

[0028] One or more annular water-stopping joints 7 are arranged in the length direction of the casing 5, and the water-stopping joints 7 are welded to the casing 5; after the casing 5 is pre-buried in the post-cast strip 3, the water-stopping joints 7 can prevent the water seeping from the leakage source 4 from leaking upward along the outer wall of the casing 5, thereby improving the water-stopping effect on the post-cast strip 3.

[0029] An expansion water-stop rubber 8 is arranged inside the casing 5, and the expansion water-stop rubber 8 is arranged along the length direction of the casing 5; the expansion water-stop rubber 8 can seal the leakage source 4, and the expansion water-stop rubber 8 fits tightly with the inner wall of the casing 5 after meeting water, which can prevent the water seeping from the leakage source 4 from leaking upward along the inner wall of the casing 5, thereby improving the water-stopping effect on the post-cast strip 3.

[0030] An annular connecting section 12 is provided at the top of the sleeve 5 (refer to Figure 2 , Figure 4), the connection joint 12 is welded to the casing 5, the top surface of the connection joint 12 is flush with the top surface of the casing 5 or the top surface height of the connection joint 12 is higher than the top surface height of the casing 5, and a water stop cap 13 for closing the top opening of the casing 5 is arranged on the top surface of the connection joint 12; after the water stop cap 13 seals the casing 5, it can completely prevent groundwater from seeping out of the casing 5, thereby improving the sealing effect.

[0031] The casing 5 is made of a steel casing with a nominal diameter not less than 15 mm. The nominal diameter of the steel casing is preferably 15-40 mm, and its specific diameter is determined according to the size of the leakage source 4. During use, the steel casing can prevent the casing 5 from deforming during use, so that the casing 5 is in good contact with the concrete of the post-cast zone 3.

[0032] The plugging layer 6 uses an expansion impermeable concrete of a higher grade than the post-casting strip 3 to ensure that the concrete of the plugging layer 6 is well combined with the post-casting strip 3, avoid cracks at the joint position of the plugging layer 6 and the post-casting strip 3, and improve the waterproof plugging performance of the casing 5. The thickness of the plugging layer 6 is 1 / 3 to 2 / 3 of the thickness of the post-casting strip 3 (preferably 1 / 2 of the thickness of the post-casting strip), and the width of the plugging layer 6 is 80 mm to 150 mm, which can not only effectively plug the casing 5, but also ensure the structural strength of the plugging layer 6 itself, and ensure the strength of the overall structure of the plugging layer 6 and the post-casting strip 3.

[0033] A reinforcing steel bar layer 11 is also provided in the cushion layer 1. The reinforcing steel bar layer 11 is provided below the waterproof reinforcing layer 14. The waterproof reinforcing layer 14 is provided in the cushion layer 1. The width of the reinforcing steel bar layer 11 is not less than the width of the post-casting strip 3. Before the concrete of the post-casting strip 3 is poured, the reinforcing steel bar layer 11 can improve the structural strength of the cushion layer 1 and prevent the cushion layer 1 from being affected by the pressure of groundwater. In the post-casting strip 3, a bottom steel bar frame 10 is provided near the bottom surface of the post-casting strip, and a top steel bar frame 9 is provided near the top surface of the post-casting strip. The top steel bar frame 9 and the bottom steel bar frame 10 are used to strengthen the structural strength of the post-casting strip 3. The casing 5 is tied and connected or welded with the top steel bar frame 9 and / or the bottom steel bar frame 10 to ensure the stability of the casing 5 and prevent the casing 5 from shifting during the concrete pouring process of the post-casting strip 3, which affects the plugging effect of the leakage source 4. The top steel bar frame 9 and the bottom steel bar frame 10 of the post-cast strip 3 are both set when the bottom plate steel bars are tied, that is, the top steel bar frame 9 of the post-cast strip 3 is also the top steel bar frame of the bottom plate, and the bottom steel bar frame 10 of the post-cast strip 3 is also the bottom steel bar frame of the bottom plate.

[0034] refer to Figure 5 The method for sealing water leakage from the bottom plate before the post-cast strip is closed comprises the following steps: Step 1: Inspect the leakage source 4 on the waterproof layer 2 at the post-cast strip between the two bottom plates and mark the location of the leakage source 4.

[0035] When checking the leakage source 4, a layer of fine sand is laid on the waterproof layer 2 where water seepage occurs, and whether water seepage holes appear on the fine sand. The position where the water seepage holes appear is the position of the leakage source 4. A wooden stick or a steel bar is passed through the top steel bar frame 9, and the wooden stick or steel bar is extended to the position of the water seepage hole, and then the wooden stick or steel bar is tied to the top steel bar frame 9 to mark the position of the leakage source 4. The position of the leakage source 4 can also be checked by other methods, as long as the position of the leakage source 4 can be determined.

[0036] Step 2: a casing 5 is arranged at the location of each leakage source 4 so that the casing 5 covers the leakage source 4 and the casing 5 is connected to the top steel bar frame 9.

[0037] When setting the casing 5, remove the binding mark on the top steel frame 9, insert the casing 5 vertically to the position of the leakage source 4, and abut against the surface of the waterproof layer 2. After the casing 5 covers the leakage source 4, the casing 5 is tied or welded to the top steel frame 9 (refer to Figure 3 ), so that the casing 5 and the top steel frame 9 are stably connected; the part of the casing 5 extending out of the bottom plate is bent and fixed horizontally on the bottom plate, and extends along the bottom plate to the position of the water collection tank, and is connected to the water pump in the water collection tank, so as to draw out the water leaking from the leakage source 4. The vertical part of the casing 5 and the horizontal part on the bottom plate can also be connected by an elbow to ensure that water passes smoothly from the bent part of the casing 5. Before setting the casing 5, a filter screen can also be set at the bottom of the casing 5. After the casing 5 contacts the waterproof layer 2, during the drainage process, the filter screen can prevent fine sand and gravel from entering the casing 5 and blocking the casing.

[0038] Step 3: Use concrete one grade higher than the concrete of the bottom plates to cast the post-cast strip 3 between the two bottom plates, and pre-embed the sleeve 5 in the concrete of the post-cast strip 3; during the concrete pouring process, drainage through the sleeve 5 can prevent the leakage source 4 from affecting the pouring quality of the concrete.

[0039] Step 4: After the concrete of the post-cast zone 3 reaches the designed strength, a plugging groove is chiseled at the position of the sleeve 5. After the depth of the plugging groove reaches the preset depth, the sleeve 5 is cut off, and the top of the sleeve 5 extends out of the bottom of the plugging groove by a certain length (such as 3-5 cm).

[0040] Step 5: Use expansive anti-seepage concrete of a higher grade than the concrete of the post-cast strip 3 to cast the plugging groove to form a plugging layer 6, and the plugging layer 6 is combined with the post-cast strip 3 to form an integral structure.

[0041] Before pouring the sealing groove, fill the expansion water-stop rubber 8 in the casing 5 so that the bottom of the expansion water-stop rubber 8 extends to the bottom of the casing 5. When the expansion water-stop rubber 8 is filled to 2~6cm close to the top of the casing 5, fill the expansion waterproof sealing paste in the casing 5. After filling to the top of the casing 5, weld the connecting section 12 at the top of the casing 5, and then weld the water-stop cap 13 on the connecting section 12 to further improve the sealing ability of the casing 5.

[0042] The above is only a detailed description of the specific implementation of the present invention, rather than a limitation of the present invention. Various substitutions, modifications and improvements made by those skilled in the relevant art without departing from the principle and scope of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for sealing water leakage from the bottom plate before the post-cast strip is closed, characterized in that: The following steps are involved: Step 1: Check the leakage source (4) on the waterproof layer (2) at the post-cast strip between the two bottom plates and mark the location of the leakage source (4); Step 2: arranging a casing (5) at the location of each leakage source (4), so that the casing (5) covers the leakage source (4), and the casing (5) is connected to the top steel frame (9); Step 3: Use concrete of a higher grade than the base plate concrete to cast the post-cast strip (3), and embed the sleeve (5) in the concrete of the post-cast strip (3); Step 4: After the concrete of the post-cast zone (3) reaches the designed strength, a plugging groove is chiseled at the position of the casing (5), and after the depth of the plugging groove reaches a preset depth, the casing (5) is cut off; Step 5: Use an expansive anti-seepage concrete of a higher grade than the concrete of the post-cast zone (3) to cast the plugging groove to form a plugging layer (6).

2. The method for sealing water leakage from the bottom plate before the post-cast strip is closed according to claim 1, characterized in that: In the step 1, the leakage source (4) on the waterproof layer (2) is checked, and the position of the leakage source (4) is marked, which includes: laying a layer of fine sand at the location where water seepage occurs on the waterproof layer (2), observing whether water seepage holes appear on the fine sand, and the location where the water seepage holes appear is the location of the leakage source (4), using a wooden stick or a steel bar to pass through the top steel bar frame (9), so that the wooden stick or the steel bar extends into the location of the water seepage hole, and then tying the wooden stick or the steel bar to the top steel bar frame (9) to mark the location of the leakage source (4).

3. The method for sealing water leakage from the bottom plate before the post-cast strip is closed according to claim 2, characterized in that: The second step specifically comprises: removing the binding mark on the top steel frame (9), vertically inserting the sleeve (5) into the position of the leakage source (4), abutting against the surface of the waterproof layer (2), and after the sleeve (5) covers the leakage source (4), binding or welding the sleeve (5) to the top steel frame (9); bending the portion of the sleeve (5) extending out of the bottom plate and fixing it horizontally on the bottom plate, and extending along the bottom plate to the position of the water collection tank, and connecting it to the water pump in the water collection tank.

4. The method for sealing water leakage from the bottom plate before the post-cast strip is closed according to claim 1, characterized in that: In the second step, before the sleeve (5) is arranged, a filter screen is arranged at the bottom of the sleeve (5).

5. The method for sealing water leakage from the bottom plate before the post-cast strip is closed according to claim 1, characterized in that: In the step 4, when the sleeve (5) is cut off, the top of the cut sleeve (5) is made to protrude 3 to 5 cm from the bottom surface of the blocking groove.

6. The method for sealing water leakage from the bottom plate before the post-cast strip is closed according to claim 1, characterized in that: In the step 5, before pouring the sealing groove, the sleeve (5) is filled with swelling water-stopping rubber (8).

7. The method for sealing water leakage from the bottom plate before the post-cast strip is closed according to claim 6, characterized in that: The bottom of the swelling waterproof rubber (8) extends to the bottom of the casing (5). When the swelling waterproof rubber (8) is filled to a depth of 2 to 6 cm close to the top of the casing (5), the casing (5) is filled with swelling waterproof sealing paste.

8. The method for sealing water leakage from the bottom plate before the post-cast strip is closed according to claim 7, characterized in that: Before pouring the plugging groove, a connection joint (12) is welded at the top of the casing (5), and then a water stop cap (13) is welded on the connection joint (12).

9. The method for sealing water leakage from the bottom plate before the post-cast strip is closed according to claim 1, characterized in that: One or more annular water stop joints (7) are provided in the length direction of the sleeve (5), and the water stop joints (7) are welded to the sleeve (5).

10. The method for blocking water leakage from the bottom slab before the post-cast strip is closed according to any one of claims 1 to 9, characterized in that: The casing (5) is a steel casing with a nominal diameter not less than 15 mm.

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