A foundation slab hydrostatic pressure release structure and method

Abstract

The present invention discloses a hydrostatic pressure release structure and method for a foundation slab, the structure comprises a natural foundation and a structural slab, a drainage ditch is provided on the natural foundation, a cushion layer is cast on the natural foundation and the drainage ditch, a group of prefabricated plain concrete piers are fixedly installed on the cushion layer at a certain interval, a reinforced concrete precast slab is laid on the prefabricated plain concrete pier, a drainage overhead layer is formed between the cushion layer and the reinforced concrete precast slab, and a structural slab is cast on the top of the reinforced concrete precast slab. The present invention adopts reinforced concrete precast slabs and precast piers to set the drainage overhead layer, releases the hydrostatic pressure of the foundation slab through the drainage overhead layer, cancels the design of the traditional waterproof layer and anti-floating anchor rods in the basement, effectively shortens the construction period, improves the on-site construction accuracy, ensures the construction quality, reduces the input of labor and materials, and reduces the construction cost.

Description

Technical Field

[0001] The invention relates to a foundation bottom plate hydrostatic pressure release structure and method, belonging to the technical field of building foundation construction. Background Art

[0002] At present, the anti-floating design of underground structures mostly adopts the "resistance" design method, such as increasing the deadweight method, anti-pullout piles or anti-pullout anchors, etc. However, for the anti-floating design of ultra-large deep foundation pits, there are problems such as excessively high underground structure costs and potential construction risks. Summary of the invention

[0003] The object of the present invention is to provide a foundation bottom plate hydrostatic pressure release structure and method with simple structure and convenient construction, so as to overcome the deficiencies in the prior art.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a foundation slab hydrostatic pressure release structure, including a natural foundation and a structural slab, a drainage ditch is opened on the natural foundation, and a cushion layer is cast on the natural foundation and the drainage ditch, a group of prefabricated plain concrete piers are fixedly installed on the cushion layer at a certain interval, reinforced concrete precast slabs are laid on the prefabricated plain concrete piers, a drainage overhead layer is formed between the cushion layer and the reinforced concrete precast slabs, and the structural slab is cast on the top of the reinforced concrete precast slabs.

[0005] Furthermore, the drainage ditch is connected to the water collection well, and a slope of 2% is set on the drainage ditch.

[0006] Furthermore, the size of the reinforced concrete precast panel is 2000mm×1000mm×80mm, and the precast plain concrete piers are supported at the four corners of the reinforced concrete precast panel.

[0007] At the same time, the present invention also provides a method for releasing the hydrostatic pressure of a foundation slab for the above-mentioned foundation slab hydrostatic pressure release structure, firstly, a drainage ditch is opened on the natural foundation, and a cushion layer is poured on the natural foundation and the drainage ditch, and then a group of prefabricated plain concrete piers are fixedly installed on the cushion layer at a certain interval, and reinforced concrete precast panels are laid on the prefabricated plain concrete piers, thereby forming a drainage overhead layer between the cushion layer and the reinforced concrete precast panels, and finally a structural bottom plate is poured on the top of the reinforced concrete precast panels, so that the water that penetrates into the drainage overhead layer from the base is collected into the surrounding water collection wells through the drainage ditch, and then the water in the water collection wells is centrally pumped and treated.

[0008] In the above method, when laying reinforced concrete precast panels, a layer of cement slurry is first applied on the gap between adjacent reinforced concrete precast panels, and then a polypropylene cloth is pasted on the gap, and finally a layer of cement slurry protective layer is applied on the surface of the polypropylene cloth.

[0009] In the above method, the height of the prefabricated plain concrete pier is adjusted according to the actual elevation of the road surface.

[0010] Compared with the prior art, the present invention has the following advantages: the present invention adopts reinforced concrete prefabricated panels and prefabricated piers to set up drainage overhead layers, and releases the hydrostatic pressure of the foundation slab through the drainage overhead layers. Moreover, the prefabricated cover plates are processed off-site in a centralized manner, which realizes batch processing and standardization, ensures installation accuracy, and saves construction time. Therefore, the present invention eliminates the design of traditional waterproof layers and anti-floating anchor rods in the basement, effectively shortens the construction period, improves on-site construction accuracy, ensures construction quality, reduces labor and material input, reduces construction costs, and meets the requirements of the country to build a conservation-oriented society. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A cross-sectional view of a schematic structural diagram of the present invention;

[0012] Figure 2 It is a plan view of the structural schematic diagram of the present invention.

[0013] Explanation of the reference numerals: 1-natural foundation; 2-cushion; 3-drainage ditch; 4-prefabricated pier; 5-drainage overhead layer; 6-prefabricated reinforced concrete slab; 7-structural base plate. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0015] Embodiments of the present invention: Participate Figure 1 and Figure 2 A hydrostatic pressure release structure of a foundation slab includes a natural foundation 1 and a structural slab 7. A drainage ditch 3 is provided on the natural foundation 1, and a cushion layer 2 is cast on the natural foundation 1 and the drainage ditch 3. A group of prefabricated plain concrete piers 4 are fixedly installed on the cushion layer 2 at a certain interval. A reinforced concrete precast slab 6 is laid on the prefabricated plain concrete pier 4. A drainage overhead layer 5 is formed between the cushion layer 2 and the reinforced concrete precast slab 6. A structural slab 7 is cast on the top of the reinforced concrete precast slab 6. The drainage ditch 3 is connected to a water collection well, and a 2% slope is set on the drainage ditch 3 to facilitate drainage. The size of the reinforced concrete precast slab 6 is 2000mm×1000mm×80mm, and the prefabricated plain concrete piers 4 are supported at the four corners of the reinforced concrete precast slab 6.

[0016] During the specific construction, firstly, a drainage ditch 3 is opened on the natural foundation 1, and a cushion layer 2 is poured on the natural foundation 1 and the drainage ditch 3, then a group of prefabricated plain concrete piers 4 are fixedly installed on the cushion layer 2 at a certain interval, and reinforced concrete precast panels 6 are laid on the prefabricated plain concrete piers 4, so as to form a drainage overhead layer 5 between the cushion layer 2 and the reinforced concrete precast panels 6, and finally a structural bottom plate 7 is poured on the top of the reinforced concrete precast panels 6, so that the water that penetrates the drainage overhead layer 5 from the base is collected into the surrounding water collection wells through the drainage ditch 3, and then the water in the water collection wells is centrally pumped and processed. The height of the prefabricated plain concrete piers 4 is adjusted according to the actual elevation of the road surface to ensure that the top of the structural bottom plate 7 is flush with the road surface.

[0017] When laying the reinforced concrete prefabricated slabs 6, firstly a layer of cement slurry is applied on the gaps between adjacent reinforced concrete prefabricated slabs 6, then a polypropylene cloth is pasted on the gaps, and finally a layer of cement slurry protective layer is applied on the surface of the polypropylene cloth.

[0018] In summary, the present invention adopts the drainage overhead layer 5 for drainage, so that the hydrostatic pressure release structure of the foundation slab adopts the idea of ​​"releasing" to handle the water buoyancy, so that the design of the traditional waterproof layer and anti-floating anchor rods in the basement is cancelled, the construction period is effectively shortened, the on-site construction accuracy is improved, the construction quality is guaranteed, the input of labor and materials is reduced, and the cost of construction is reduced, which meets the requirements of the country to build a conservation-oriented society. At the same time, the steel bar construction of the structural bottom plate 7 can be directly constructed using the reinforced concrete prefabricated plate 6 as a template, without the need to construct a concrete cushion layer, and due to the existence of the drainage overhead layer 5, the construction of the foundation bottom plate waterproof coating and coiled material is cancelled, saving construction costs and improving construction efficiency.

Claims

1. A foundation slab hydrostatic pressure release structure, comprising a natural foundation (1) and a structural slab (7), characterized in that: A drainage ditch (3) is opened on the natural foundation (1), and a cushion layer (2) is cast on the natural foundation (1) and the drainage ditch (3); a group of prefabricated plain concrete piers (4) are fixedly installed on the cushion layer (2) at a certain interval; a reinforced concrete precast slab (6) is laid on the prefabricated plain concrete pier (4); a drainage overhead layer (5) is formed between the cushion layer (2) and the reinforced concrete precast slab (6); a structural bottom plate (7) is cast on the top of the reinforced concrete precast slab (6); the drainage ditch (3) is connected to a water collection well, and a slope of 2% is set on the drainage ditch (3); the size of the reinforced concrete precast slab (6) is 2000mm×1000mm×80mm, and the prefabricated plain concrete piers (4) are supported at four corners of the reinforced concrete precast slab (6).

2. A method for releasing the hydrostatic pressure of a foundation slab used in the hydrostatic pressure release structure of the foundation slab according to claim 1, characterized in that: First, a drainage ditch (3) is opened on the natural foundation (1), and a cushion layer (2) is poured on the natural foundation (1) and the drainage ditch (3). Then, a group of prefabricated plain concrete piers (4) are fixedly installed on the cushion layer (2) at a certain interval, and reinforced concrete precast panels (6) are laid on the prefabricated plain concrete piers (4), so that a drainage overhead layer (5) is formed between the cushion layer (2) and the reinforced concrete precast panels (6). Finally, a structural bottom plate (7) is poured on the top of the reinforced concrete precast panels (6), so that water that penetrates the base into the drainage overhead layer (5) is collected into the surrounding water collection wells through the drainage ditch (3), and then the water in the water collection wells is centrally pumped and discharged.

3. The method for releasing hydrostatic pressure of a foundation slab according to claim 2, characterized in that: When laying the reinforced concrete prefabricated slabs (6), a layer of cement slurry is first applied to the gaps between adjacent reinforced concrete prefabricated slabs (6), then a polypropylene cloth is pasted on the gaps, and finally a layer of cement slurry protective layer is applied to the surface of the polypropylene cloth.

4. The method for releasing hydrostatic pressure of a foundation slab according to claim 2, characterized in that: The height of the prefabricated plain concrete buttress (4) is adjusted according to the actual elevation of the road surface.

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