Waterproof construction method for junction of diaphragm wall and bottom plate

Abstract

The invention discloses a waterproof construction method for a junction of an underground diaphragm wall and a bottom plate, which comprises the following steps: when a side wall of a first-stage basement is constructed, a waterproof blanket is padded between the side wall and the underground diaphragm wall, and protective clamping plates are respectively arranged on two opposite sides of the upper part of the waterproof blanket; before the bottom plate and the floor slab are communicated, the underground diaphragm wall at the position corresponding to the bottom plate is dismantled to expose the protection clamping plate; a cushion layer of the bottom plate is poured and extends to the detached underground diaphragm wall; the protective clamping plates on the waterproof blanket are removed to expose the upper portion of the waterproof blanket; folding the upper part of the waterproof blanket and laying the waterproof blanket on the cushion layer; and the waterproof layer of the bottom plate is laid on the folded waterproof blanket in an extending mode. The problem that leakage hidden danger exists after through connection due to the fact that an existing through construction method for basements on the two sides of the common underground diaphragm wall is prone to damage a firstly-constructed waterproof structure is solved.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a waterproofing construction method at the junction of a diaphragm wall and a base slab. Background Technology

[0002] In the basement project, the diaphragm wall connects to the third and second basement levels, respectively. The waterproofing of the basement side walls consists of a 1mm thick cement-based penetrating crystalline waterproofing coating plus a layer of film-forming sodium-based bentonite waterproofing blanket (dry weight not less than 5000g / m²). 2 The waterproofing method for the basement floor slab is 1.5mm thick self-adhesive polymer (non-woven PE film) modified bitumen waterproof membrane (Type II) + 1.2mm thick pre-laid high-polymer self-adhesive membrane waterproof membrane (HDPE).

[0003] When constructing the second basement level, the structural floor slab of the B2 level and the bottom slab of the B2 level on the other side are constructed first. When the basement is connected, the diaphragm wall of the second basement level needs to be removed. When removing the diaphragm wall, the waterproof blanket of the side wall that has been constructed will be damaged, resulting in the bottom slab and the waterproof layer of the side wall not being able to overlap. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, a waterproofing construction method is provided at the junction of diaphragm wall and base slab. This method addresses the problem that existing methods for constructing continuous basement floor slabs on both sides of a shared diaphragm wall can easily damage the pre-constructed waterproofing structure, leading to potential leakage after the connection is completed.

[0005] To achieve the above objectives, a waterproofing construction method is provided at the junction of a diaphragm wall and a base slab. One side of the diaphragm wall is cast with a floor slab for a first-phase basement, and the other side is cast with a base slab for a second-phase basement. The floor slab corresponds to the base slab. The waterproofing construction method at the junction of the diaphragm wall and the base slab includes the following steps:

[0006] When constructing the side walls of the first phase basement, a waterproof blanket is placed between the side walls and the diaphragm wall, and protective clamps are respectively installed on the opposite sides of the upper part of the waterproof blanket.

[0007] Before connecting the base plate and the floor slab, the diaphragm wall at the position corresponding to the base plate is removed to expose the protective clamping plate;

[0008] The base slab is poured and extends to the removed diaphragm wall;

[0009] Remove the protective clips on the waterproof blanket to expose the upper part of the waterproof blanket;

[0010] Fold the top of the waterproof blanket over and lay it on the padding layer;

[0011] The waterproof layer of the base plate is extended and laid on the folded waterproof blanket;

[0012] Concrete is poured on the waterproof layer to connect the base slab and the floor slab.

[0013] Furthermore, after the waterproof layer is laid on the folded waterproof blanket, the waterproof layer is folded up and laid on the side wall.

[0014] Furthermore, before folding up the waterproof layer, a waterproof reinforcement layer is laid at the junction of the folded waterproof blanket and the side wall. Then, the folded waterproof layer is laid on the waterproof reinforcement layer and extends to the side wall above the waterproof reinforcement layer.

[0015] Furthermore, when dismantling the diaphragm wall, the diaphragm wall is divided into multiple sections, and the multiple sections are dismantled using the skip-section method to complete the overlap and connection between the waterproof layer and the waterproof blanket.

[0016] Furthermore, the protective clamp is an extruded polystyrene board.

[0017] The beneficial effects of this invention are as follows: The waterproofing construction method at the junction of the diaphragm wall and the base slab involves installing protective plates on both sides of the waterproofing blanket as a protective layer during the construction of the side wall waterproofing layer of the first-phase basement. Before removing the diaphragm wall and connecting the base slab of the second-phase basement with the floor slab of the first-phase basement, a bedding layer for the base slab of the second-phase basement is first poured. Then, the waterproofing blanket is folded onto the bedding layer to form a post-pouring area. The waterproofing layer of the base slab is extended and laid within the post-pouring area. Finally, the reinforcing bars of the base slab and the floor slab are connected, and concrete is poured within the post-pouring area to complete the connection between the floor slab of the first-phase basement and the base slab of the second-phase basement. This waterproofing construction method at the junction of the diaphragm wall and the base slab is easy to construct, does not damage the waterproofing blanket of the first-phase basement, ensures the continuity and integrity of the waterproofing layer, and improves the waterproofing quality at the junction of the basement exterior wall and the base slab. Attached Figure Description

[0018] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0019] Figures 1 to 4 This is a schematic diagram illustrating the steps of a waterproofing construction method at the junction of the diaphragm wall and the base slab according to an embodiment of the present invention.

[0020] Figure label:

[0021] 1. Diaphragm wall, 11. Floor slab, 12. Subfloor slab, 121. Subfloor layer, 122. Waterproofing layer, 123. Waterproofing reinforcement layer, 13. Side wall;

[0022] 2. Waterproof blanket; 21. Protective splint. Detailed Implementation

[0023] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] Reference Figure 1 As shown, in this embodiment, the present invention provides a waterproofing construction method at the junction of a diaphragm wall and a base slab, used for the continuous construction of the base slab and floor slab on opposite sides of the diaphragm wall. One side of the diaphragm wall is poured to form a first-phase basement. The first-phase basement has three floors. The other side of the diaphragm wall is poured to form a second-phase basement. The second-phase basement is constructed later, while the first-phase basement is constructed first. The second-phase basement has two floors. A floor slab 11 for the first-phase basement is poured on one side of the diaphragm wall 1. A base slab 12 for the second-phase basement is poured on the other side of the diaphragm wall 1. The positions of the floor slab 11 and the base slab 12 correspond. The elevation of the second-floor slab of the first-phase basement is adapted to the elevation of the base slab of the second-phase basement.

[0026] During the construction of the first-phase basement, a waterproof structure was installed between the side walls and the diaphragm walls. This waterproof structure includes a waterproof blanket and a waterproof layer. The waterproof layer is a 1mm thick cement-based penetrating crystalline waterproof coating. The waterproof blanket consists of a film-type sodium bentonite waterproof blanket (dry weight not less than 5000g / m²). 2 One side of the diaphragm wall is coated with a waterproof layer, and a waterproof blanket is laid on top of the waterproof layer.

[0027] Reference Figures 1 to 4 As shown, the waterproofing construction method at the junction of the diaphragm wall and the base slab of the present invention specifically includes the following steps:

[0028] S1. When constructing the side wall 13 of the basement in the first phase, a waterproof blanket 2 is placed between the side wall 13 and the ground diaphragm wall 1, and protective clamps 21 are respectively installed on the opposite sides of the upper part of the waterproof blanket 2.

[0029] Specifically, the lower part of the waterproof blanket overlaps the upper waterproof layer of the basement floor slab in Phase I. The upper part of the waterproof blanket is secured and protected by protective clamps.

[0030] In a preferred embodiment, the protective clamp 21 is an extruded polystyrene board. The thickness of the extruded polystyrene board is 20 mm.

[0031] S2. Before connecting the base plate 12 and the floor slab 11, remove the diaphragm wall 1 at the position corresponding to the base plate 12 to expose the protective slab 21.

[0032] During the construction of the second-phase basement, the foundation slab was lowered when it reached the diaphragm wall, and a load-bearing structure was installed. At this point, the diaphragm wall at the corresponding location of the foundation slab was removed to expose the protective slab.

[0033] In this embodiment, the elevation of the lower part of the protective clamp is slightly lower than the elevation of the bottom of the base plate.

[0034] As a preferred implementation method, when dismantling the diaphragm wall 1, the diaphragm wall 1 is divided into multiple sections, and multiple sections are dismantled using the skip-section method to complete the overlap and connection between the waterproof layer 122 and the waterproof blanket 2.

[0035] S3, pour the foundation 121 of the base slab 12 and extend it to the diaphragm wall 1 after it has been removed.

[0036] After the diaphragm wall is removed, the bottom layer is extended and poured to the top of the removed diaphragm wall.

[0037] S4. Remove the protective clip 21 on the waterproof blanket 2 to expose the upper part of the waterproof blanket 2.

[0038] After the subbase is poured up to the diaphragm wall, the exposed protective cladding is removed, exposing the upper part of the waterproof blanket.

[0039] S5. Fold the upper part of the waterproof blanket 2 and lay it on the padding layer 121.

[0040] Flip the top of the waterproof blanket over and lay it flat on the padding.

[0041] After the waterproof layer 122 is laid on the folded waterproof blanket 2, the waterproof layer 122 is flipped up and laid on the side wall 13.

[0042] As a preferred embodiment, before the waterproof layer 122 is flipped up, a waterproof reinforcement layer 123 is laid at the junction of the folded waterproof blanket 2 and the side wall 13. Then, the flipped waterproof layer 122 is laid on the waterproof reinforcement layer 123 and extends to the side wall 13 above the waterproof reinforcement layer 123.

[0043] S6. Extend the waterproof layer 122 of the base plate 12 onto the folded waterproof blanket 2.

[0044] S7. Pour concrete on the waterproof layer 122 to connect the base slab 12 and the floor slab 11.

[0045] The present invention discloses a waterproofing construction method for the junction of the diaphragm wall and the base slab. During the construction of the waterproofing layer on the side walls of the first-phase basement, protective clamps are installed on both sides of the waterproofing blanket as protective layers. Before removing the diaphragm wall and connecting the base slab of the second-phase basement with the floor slab of the first-phase basement, a foundation layer for the base slab of the second-phase basement is first poured. The waterproofing blanket is then folded onto the foundation layer to form a post-pouring area. The waterproofing layer of the base slab is extended and laid within the post-pouring area, and a waterproofing reinforcement layer with a width of not less than 250mm is installed at the corner where the side wall meets the foundation layer. Finally, the reinforcing bars of the base slab and the floor slab are connected, and concrete is poured within the post-pouring area to complete the connection between the floor slab of the first-phase basement and the base slab of the second-phase basement.

[0046] The waterproofing construction method at the junction of the diaphragm wall and the base slab of the present invention is easy to construct, does not damage the waterproofing blanket of the first-phase basement, can ensure the continuity and integrity of the waterproofing layer, and improves the waterproofing quality at the junction of the basement exterior wall and the base slab.

[0047] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A waterproofing construction method for the junction of a diaphragm wall and a base slab, characterized in that, The floor slab of the first-phase basement is poured on one side of the diaphragm wall, and the bottom slab of the second-phase basement is poured on the other side of the diaphragm wall. The position of the floor slab corresponds to the position of the bottom slab. The waterproofing construction method at the junction of the diaphragm wall and the bottom slab includes the following steps: When constructing the side walls of the first phase basement, a waterproof blanket is placed between the side walls and the diaphragm wall, and protective clamps are respectively installed on the opposite sides of the upper part of the waterproof blanket. Before connecting the base plate and the floor slab, the diaphragm wall at the position corresponding to the base plate is removed to expose the protective clamping plate; The base slab is poured and extends to the removed diaphragm wall; Remove the protective clips on the waterproof blanket to expose the upper part of the waterproof blanket; Fold the top of the waterproof blanket over and lay it on the padding layer; The waterproof layer of the base plate is extended and laid on the folded waterproof blanket; Concrete is poured on the waterproof layer to connect the base slab and the floor slab.

2. The waterproofing construction method at the junction of the diaphragm wall and the base slab according to claim 1, characterized in that, After the waterproof layer is laid on the folded waterproof blanket, the waterproof layer is folded up and laid on the side wall.

3. The waterproofing construction method at the junction of the diaphragm wall and the base slab according to claim 2, characterized in that, Before flipping up the waterproof layer, a waterproof reinforcement layer is laid at the junction of the folded waterproof blanket and the side wall. Then, the flipped-up waterproof layer is laid on the waterproof reinforcement layer and extends to the side wall above the waterproof reinforcement layer.

4. The waterproofing construction method at the junction of the diaphragm wall and the base slab according to claim 1, characterized in that, When dismantling the diaphragm wall, the diaphragm wall is divided into multiple sections, and the multiple sections are dismantled using the skip-section method to complete the overlap and connection between the waterproof layer and the waterproof blanket.

5. The waterproofing construction method at the junction of the diaphragm wall and the base slab according to claim 1, characterized in that, The protective clamp is made of extruded polystyrene board.

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