CN114045882A - Waterproof construction method for post-cast strip of underground engineering - Google Patents
Waterproof construction method for post-cast strip of underground engineering Download PDFInfo
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- CN114045882A CN114045882A CN202111482626.7A CN202111482626A CN114045882A CN 114045882 A CN114045882 A CN 114045882A CN 202111482626 A CN202111482626 A CN 202111482626A CN 114045882 A CN114045882 A CN 114045882A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/16—Arrangement or construction of joints in foundation structures
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Abstract
The invention discloses a waterproof construction method for a post-cast strip of underground engineering, which comprises the following steps: reserving a slag collection groove of 1500-2000 mm and sinking by 100 mm at the design position of the post-pouring belt as the post-pouring belt; arranging a sunken cushion layer and arranging bottom ribs in the post-cast strip; continuously laying a pre-laid coiled material on the cushion layer, and adding a half-seam isolating sheet on the pre-laid coiled material at the central position of the post-cast strip; arranging a concrete protective layer on the pre-laid coiled material, configuring reinforcing steel bars which are bent upwards to be as high as the main body of the bottom plate in the protective layer, arranging disassembly-free mesh templates on two sides of the post-cast strip for shaping the interface of the post-cast strip, spot-welding the mesh templates on the bent reinforcing steel bars, and extending the mesh templates to the inclined plane of a slag collecting groove of the post-cast strip as required and fixing the mesh templates by spot welding; the mesh template is provided with a water-swelling adhesive tape; the protective layer and the bottom plate main body are poured simultaneously. The invention enables the post-cast strip pre-laid coiled material to be continuously sealed, can adapt to larger deformation, resists floating water pressure in a short time and is convenient for slag removal.
Description
Technical Field
The invention relates to a waterproof technology of underground engineering, in particular to a waterproof construction method of a post-cast strip of underground engineering.
Background
Underground works, especially building basements, often need to design post-cast strips when the length is long or the area is large, so as to solve the problem of cracks caused by hydration shrinkage. The post-pouring belt separates the basement bottom plate (together with the side wall and the top plate) according to a certain distance, and the separation belt has a normal width of 800-1000 mm. And pouring the post-cast strip concrete after the concrete slab blocks separated by the post-cast strip are poured for at least two months. In practice, the two-month open placement brings with it a number of problems.
The concrete bottom plate is flexible and waterproof, and is usually designed with a concrete protective layer to prevent the bottom plate from being damaged when binding reinforcing steel bars. However, if the flexible external waterproof material is a pre-laid coiled material, the self-adhesive of the pre-laid coiled material is coated with a layer of sand grain protective surface, after the concrete is poured, the alkaline calcium hydroxide in the concrete penetrates through the sand grain layer, permeates into the adhesive film and is reversely adhered to the concrete bottom plate, and the concrete protection is not needed. Therefore, before concrete pouring, workers need to perform the construction according to a correct construction method, the sand surface layer is prevented from being polluted and damaged, and the concrete pouring is kept. However, the rear pouring belt part is difficult to keep clean because the rear pouring belt part needs to be opened for more than two months. Particularly, before the post-cast strip is poured, concrete on two sides of the strip needs to be cleaned, a large amount of concrete slag is generated and mixed with garbage, precipitation and construction water falling into the strip, and the sand protective surface of the pre-paved coiled material is seriously polluted, so that the anti-adhesion effect is lost.
However, all traditional construction atlas has no nodes for pre-laid rolls at post-cast strip.
In engineering practice, the better method is as follows: firstly, making a post-cast strip cushion layer, pre-paving coiled materials on the cushion layer, and then applying an integral cushion layer to form the concrete protection of the post-cast strip pre-paved coiled materials. After the whole cushion layer reaches the strength, the base plate is constructed to be pre-paved with coiled materials. The problems of the method are that: firstly, the construction period is long, and secondly, the pre-laid coiled material cannot form continuous sealing. During the open period, the longer time of sunshine irradiation also reduces the anti-sticking effect of the pre-paved coiled material. In addition, when the underground water level is not high, a lot of engineering ventures adopt simple precipitation, and if foundation pit precipitation is in case of failure, the open post-cast strip part can firstly float upwards to be damaged, so reinforcement measures are required to be taken in advance. Namely: and bidirectional reinforcing steel bars are arranged on the cushion layer below the post-cast strip pre-laid coiled material and the protective cushion layer above the post-cast strip pre-laid coiled material.
In order to solve the above problems at the same time, a new post-cast strip structure needs to be designed.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present invention is to provide a waterproof construction method for a post-cast strip of an underground engineering, so as to solve the problems that a pre-laid coiled material is easily polluted, the pre-laid coiled material cannot form continuous sealing, a construction period is long, and the post-cast strip cannot adapt to large deformation in the existing post-cast strip manufacturing process.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a waterproof construction method for a post-cast strip of underground engineering comprises the following steps:
reserving a slag collection groove of 1500-2000 mm and sinking by 100 mm at the design position of the post-pouring belt as the post-pouring belt;
arranging a sunken cushion layer and arranging bottom ribs in the post-cast strip;
continuously laying a pre-laid coiled material on the cushion layer, and adding a half-seam isolating sheet on the pre-laid coiled material at the central position of the post-cast strip;
a concrete protective layer is arranged on the pre-laid coiled material, reinforcing steel bars bent upwards to be as high as the main body of the bottom plate are arranged in the protective layer, disassembly-free mesh templates are arranged on two sides of the post-cast strip and used for shaping the interface of the post-cast strip, the mesh templates are spot-welded on the bent reinforcing steel bars, and the mesh templates extend downwards to the inclined plane of a slag collecting groove of the post-cast strip as required and are fixed in a spot welding manner; the mesh template is provided with a water-swelling adhesive tape;
the protective layer and the bottom plate main body are poured simultaneously.
Further, the method also comprises the following steps: the exposure of the reserved steel bars of the poured bottom plate main body is 300-500 mm; pouring front cleaning belt slag scraps on the post-pouring belt, and binding post-pouring belt steel bars; and coating the interface of the post-cast strip with a permeable crystallization waterproof coating.
Further, the thinnest position of the cushion layer is 100 mm, the cushion layer is poured by C25 concrete, and the bottom ribs are arranged in a two-way mode, wherein the thickness of the bottom ribs is phi 10@150 mm.
Further, the semi-seam spacer is approximately in an inverted T shape and comprises a bottom sheet and a vertical film perpendicular to the bottom sheet, the material is PVC, the width is 60 mm, the height is 40 mm, the thickness of the bottom sheet is 8 mm, and the thickness of the vertical film is 3 mm.
Furthermore, the bottom of the negative film is provided with a butyl self-adhesive film which is protected by release paper, before installation, the sand grain protective surface on the corresponding position of the pre-paved coiled material is scraped by a putty knife, the release paper is removed immediately, and the release sheet is adhered on the pre-paved coiled material.
Further, the thinnest position of the protective layer is 100 mm, the protective layer is poured by C30 concrete, and the reinforcing bars are arranged upwards, are phi 10@150 mm and are arranged in a bidirectional mode.
Furthermore, the reinforcing bars are bent to the upper-layer reinforcing bars of the bottom plate on two sides of the post-cast strip and are bound to the reinforcing bars of the bottom plate.
Furthermore, reinforcing ribs are arranged on the reinforcing ribs, and the reinforcing ribs arranged on the protective layer and the cushion bottom ribs jointly form a short-time floating-resisting structure.
Furthermore, the disassembly-free mesh template is manufactured by stamping a 0.6 mm thick steel plate and is subjected to full galvanizing; the mesh opening is 36 mm in width and 10 mm in height, the outer side of the mesh opening is open, and the angle is 45 degrees upwards.
The invention discloses a waterproof construction method for a post-cast strip of underground engineering, which simultaneously solves the problems of protection of pre-laid coiled materials at the strip, continuous sealing of the pre-laid coiled materials, large deformation adaptation, short-time floating water pressure resistance and slag removal before post-casting.
Drawings
Fig. 1 is a schematic view of a waterproof structure of a post-cast strip of an underground project according to an embodiment of the invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The waterproof construction method of the post-cast strip of the underground engineering shown in figure 1 comprises the following steps:
before the bottom plate main body 10 and the bottom plate main body 20 are poured, a space of 1500 mm-2000 mm is reserved at the design position of the post-pouring belt and sinks for 100 mm, namely, the space formed by sinking is used as a slag collection groove of the post-pouring belt at a position A in the drawing, so that the cleaning is easy; then arranging a sunken cushion layer 1 in the post-cast strip and configuring bottom ribs; the thinnest position of the cushion layer is 100 mm, the cushion layer is poured by C25 concrete, the bottom rib is phi 10@150 mm, and the cushion layer is in bidirectional configuration.
Continuously laying a pre-laid coiled material 2 on the cushion layer 1 to form a continuous sealing waterproof layer, and additionally arranging a half-seam isolating sheet 7 on the pre-laid coiled material 2 at the central position of the post-cast strip, wherein when the post-cast strip is greatly deformed by the half-seam isolating sheet 7, the pre-laid coiled material only slides and is not torn, so that continuous sealing is kept; the semi-seam isolating sheet 7 is approximately in an inverted T shape and comprises a bottom sheet and a vertical film vertical to the bottom sheet, the material is PVC, the width is 60 mm, the height is 40 mm, the thickness of the bottom sheet is 8 mm, the thickness of the vertical film is 3 mm, a butyl self-adhesive film is arranged at the bottom of the bottom sheet and is protected by isolating paper, before installation, a sand grain protective surface on the corresponding position of the pre-laid coiled material is scraped by an putty knife, the isolating paper is immediately removed, and the isolating sheet is cemented on the pre-laid coiled material.
Then, arranging a concrete protective layer 3 on the pre-laid coiled material 2, configuring a reinforcing steel bar 4 which is bent upwards to be as high as the main body of the bottom plate in the protective layer 3, arranging a disassembly-free mesh template 8 on the side surface B and the side surface C of the post-cast strip, using the disassembly-free mesh template 8 for the interface shaping of the post-cast strip, spot-welding the mesh template on the bent reinforcing steel bar, and allowing the mesh template 8 to extend downwards to the inclined plane of a slag collecting groove of the post-cast strip as required (if concrete with higher fluidity is adopted) and fixing the inclined plane by spot welding; the mesh template is provided with a water-swelling adhesive tape; the disassembly-free mesh template 8 is manufactured by stamping a 0.6 mm thick steel plate and is subjected to full galvanizing; the mesh opening is 36 mm wide and 10 mm high, the outer side is open, the angle is 45 degrees upwards, and the general flowable concrete hardly overflows. The protective layer 3, the bottom plate main body 10 and the bottom plate main body 20 are poured at the same time, so that the construction period is effectively shortened, and the pre-paved coiled materials are protected from being damaged and polluted; the thinnest position of the protective layer is 100 mm, the protective layer is poured by C30 concrete, and the reinforcing bars are arranged upwards, are phi 10@150 mm and are configured in a two-way mode. The reinforcing bars are bent to the upper layer reinforcing bars of the bottom plate on two sides of the post-cast strip and are bound to the reinforcing bars of the bottom plate. When needed, the reinforcing bars can be further provided with reinforcing ribs, and the reinforcing ribs arranged on the protective layer and the cushion bottom ribs jointly form a short-time floating-up resistant structure.
The exposure of the steel bar reserved in the poured bottom plate main body is 300-500 mm (the small value is taken when the diameter of the steel bar is larger, and the upper value is taken on the contrary); if the reinforcing steel bar is thick, a sleeve joint is recommended. Pouring front cleaning belt slag scraps on the post-pouring belt, and binding post-pouring belt steel bars; and before the post-cast strip is poured with micro-expansion concrete, coating a permeable crystalline waterproof coating on the boundary of the post-cast strip.
The waterproof construction method for the post-cast strip of the underground engineering realized by the embodiment solves the problems of protection of the pre-laid coiled material at the strip, continuous sealing of the pre-laid coiled material, large deformation adaptation, short-time floating water pressure resistance and slag removal before post-casting.
The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, and are not to be construed as limiting the scope of the invention. Those skilled in the art can implement the invention in various modifications, such as features from one embodiment can be used in another embodiment to yield yet a further embodiment, without departing from the scope and spirit of the invention. Any modification, equivalent replacement and improvement made within the technical idea of using the present invention should be within the scope of the right of the present invention.
Claims (9)
1. A waterproof construction method for a post-cast strip of underground engineering is characterized by comprising the following steps:
reserving a slag collection groove of 1500-2000 mm and sinking by 100 mm at the design position of the post-pouring belt as the post-pouring belt;
arranging a sunken cushion layer and arranging bottom ribs in the post-cast strip;
continuously laying a pre-laid coiled material on the cushion layer, and adding a half-seam isolating sheet on the pre-laid coiled material at the central position of the post-cast strip;
a concrete protective layer is arranged on the pre-laid coiled material, reinforcing steel bars bent upwards to be as high as the main body of the bottom plate are arranged in the protective layer, disassembly-free mesh templates are arranged on two sides of the post-cast strip and used for shaping the interface of the post-cast strip, the mesh templates are spot-welded on the bent reinforcing steel bars, and the mesh templates extend downwards to the inclined plane of a slag collecting groove of the post-cast strip as required and are fixed in a spot welding manner; the mesh template is provided with a water-swelling adhesive tape;
the protective layer and the bottom plate main body are poured simultaneously.
2. The underground works post-cast strip waterproof construction method according to claim 1, characterized in that: further comprising the steps of: the exposure of the reserved steel bars of the poured bottom plate main body is 300-500 mm; pouring front cleaning belt slag scraps on the post-pouring belt, and binding post-pouring belt steel bars; and coating the interface of the post-cast strip with a permeable crystallization waterproof coating.
3. The underground works post-cast strip waterproof construction method according to claim 1, characterized in that: the thinnest position of the cushion layer is 100 mm, the cushion layer is poured by C25 concrete, and the configured bottom rib is phi 10@150 mm and is in bidirectional configuration.
4. The underground works post-cast strip waterproof construction method according to claim 1, characterized in that: the semi-seam isolating sheet is approximately in an inverted T shape, comprises a bottom sheet and a vertical film vertical to the bottom sheet, is made of PVC (polyvinyl chloride), and is 60 mm wide, 40 mm high, 8 mm thick and 3 mm thick, and when the post-pouring belt is deformed greatly, the pre-laid coiled material only slides and is not torn, and continuous sealing is kept.
5. The underground works post-cast strip waterproof construction method according to claim 4, characterized in that: the bottom of the negative film is provided with a butyl self-adhesive film which is protected by isolation paper, before installation, the sand grain protective surface on the corresponding position of the pre-paved coiled material is scraped by a putty knife, the isolation paper is removed immediately, and an isolation sheet is adhered on the pre-paved coiled material.
6. The underground works post-cast strip waterproof construction method according to claim 1, characterized in that: the thinnest position of the protective layer is 100 mm, the protective layer is poured by C30 concrete, and reinforcing bars are arranged upwards, and are phi 10@150 mm and bidirectional.
7. The underground works post-cast strip waterproof construction method according to claim 6, characterized in that: and the reinforcing bars are bent to the upper-layer reinforcing bars of the bottom plate on two sides of the post-cast strip and are bound to the reinforcing bars of the bottom plate.
8. The underground works post-cast strip waterproofing construction method according to claim 7, characterized in that: reinforcing ribs are arranged on the reinforcing ribs, and the reinforcing ribs arranged on the protective layer and the cushion layer bottom ribs jointly form a short-time floating resisting structure.
9. The underground works post-cast strip waterproof construction method according to claim 1, characterized in that: the disassembly-free mesh template is manufactured by stamping a 0.6 mm thick steel plate and is subjected to full galvanizing; the mesh opening is 36 mm in width and 10 mm in height, the outer side of the mesh opening is open, and the angle is 45 degrees upwards.
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| CN202111482626.7A CN114045882B (en) | 2021-12-07 | 2021-12-07 | Waterproof construction method for post-cast strip of underground engineering |
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| CN202111482626.7A CN114045882B (en) | 2021-12-07 | 2021-12-07 | Waterproof construction method for post-cast strip of underground engineering |
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| CN214245850U (en) * | 2020-10-13 | 2021-09-21 | 四川工商学院 | Advanced water stop structure of post-cast strip |
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2021
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| CN201162233Y (en) * | 2008-03-03 | 2008-12-10 | 南通华新建工集团有限公司 | Rear irrigation zone structure with higher ground water level |
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| CN204676609U (en) * | 2015-05-19 | 2015-09-30 | 五冶集团上海有限公司 | The reinforced waterproof construction of a kind of basement bottom plate rear pouring tape |
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