Method for detecting bearing capacity of drainage layer of bottom plate of underground parking lot

Abstract

The invention discloses a method for detecting bearing capacity of a drainage layer of a bottom plate of an underground parking lot. The method includes preparing a plurality of hydrophobic layer samples; a dynamometer is used for pressing the hydrophobic layer sample and acquiring detection data; recording detection data of the hydrophobic layer sample, and determining a stress limit value of the hydrophobic layer sample; and selecting the hydrophobic layer sample with the stress limit value meeting the design requirement of the parking lot bottom plate hydrophobic layer as a formal product to lay the hydrophobic layer of the parking lot bottom plate. According to the method, samples are manufactured for the hydrophobic plates with different convex cup heights, convex cup diameters, thicknesses and convex cup numbers, and the bearing capacity of the samples is detected, so that the bearing capacity of the particularly manufactured hydrophobic layer is objectively and accurately determined, and the hydrophobic plates meeting design load requirements are selected to manufacture the hydrophobic layer; and the influence of collapse of a floor hydrophobic layer caused by uneven stress of the floor of the underground parking lot when vehicles enter and exit frequently on the hydrophobic function is reduced.

Description

Technical Field

[0001] This invention relates to the field of building construction, and more particularly to the construction testing of concrete foundation slabs, specifically a method for testing the bearing capacity of the drainage layer of an underground parking lot foundation slab. Background Technology

[0002] Currently, due to the decreasing availability of land in urban construction, underground parking lots have become a standard feature of many public buildings and residential communities. However, leakage in the basement slab is a frequent and challenging problem during the construction of underground parking lots. To address the adverse effects of basement slab leakage, based on the principle of "drainage as the primary method" in basement waterproofing, drainage boards are commonly used as drainage layers in parking lot project designs. However, according to the building materials industry standard JC / T 2112-2012 "Plastic Protective Drainage Board" and the transportation industry standard JT / T 521-2004 "Geosynthetic Plastic Drainage Board (Strip) for Highway Engineering," only requirements are specified for the testing of the main materials and drainage capacity. Furthermore, Article 3.2 of JC / T 2112-2012 only describes the height of the drainage board's convex cup (concave-convex) joint, the thickness of the drainage board, and the width of the drainage board, lacking provisions for testing methods of the bearing capacity of the drainage board or drainage layer. This results in a significant uncertainty in the load-bearing capacity of the hydrophobic board when used as a hydrophobic layer in engineering projects. This can easily lead to damage and failure of the hydrophobic board due to vehicle pressure during use, ultimately causing problems such as hydrophobic board failure and leakage of the base plate. Summary of the Invention

[0003] This invention, by studying the structural characteristics of hydrophobic layers, provides a simple and convenient method for testing the bearing capacity of hydrophobic plates and hydrophobic layers. This provides a scientific and effective guarantee for verifying the bearing capacity of underground hydrophobic layers and selecting suitable hydrophobic plates, reducing the risk of uneven ground settlement and reducing subsequent maintenance costs.

[0004] To achieve the above objectives, the present invention is implemented as follows: A method for testing the bearing capacity of the drainage layer of an underground parking garage floor, including... Step 1: Prepare several hydrophobic layer samples; Step 2: Press the hydrophobic layer sample described in Step 1 using a force gauge and obtain the test data; Step 3: Record the test data of the hydrophobic layer sample and determine the stress limit value of the hydrophobic layer sample; Step 4: Select a hydrophobic layer sample whose stress limit value meets the design requirements of the hydrophobic layer of the parking lot floor as the formal product for laying the hydrophobic layer of the parking lot floor.

[0005] In the above-mentioned method for testing the bearing capacity of the hydrophobic layer of the underground parking lot floor slab, the method for preparing the hydrophobic layer sample includes: Step 1.1: Based on the design load requirements of the bottom slab's drainage layer, select drainage plates with different cup opening diameters and cut them into squares; Step 1.2: Based on the cut dimensions of the drainage board, use a wooden template to make a casting box and place the drainage board described in Step 1.1 inside the casting box; Step 1.3: Pour concrete into the casting box according to the design mix ratio and vibrate it with a vibrator to finally form a hydrophobic layer sample; Step 1.4: Curing of the hydrophobic layer sample.

[0006] This invention proposes a method for testing the bearing capacity of a drainage layer on the floor of a parking lot. By preparing samples of drainage boards with different parameters such as cup height, cup diameter, thickness, and number of cups and testing their bearing capacity, the bearing capacity of the drainage layer can be objectively and accurately determined. This allows for the selection of drainage boards that meet the design load requirements for the drainage layer, thereby reducing the impact of uneven stress on the drainage function of the drainage layer caused by frequent vehicle entry and exit in underground parking lots, and also reducing the maintenance cost of the parking lot floor in the later stages.

[0007] Furthermore, this invention also proposes a parking lot floor structure based on the above-mentioned hydrophobic layer testing method, which, from bottom to top, comprises a reinforced concrete waterproof base slab, a pure cement slurry layer, a fine aggregate concrete layer, a hydrophobic layer, a C30 fine aggregate concrete layer, and a concrete surface sealing and curing agent layer; wherein: The thickness of the fine aggregate concrete layer shall not be less than 1% and shall be sloped towards the surrounding drainage ditches at a rate of 1%. The pure cement slurry layer contains 3% 108 adhesive; The hydrophobic layer refers to high-density polyethylene plastic drainage board; The C30 fine aggregate concrete layer is of thickness [thickness value missing], and a ∅6@150 steel reinforcement layer is set within it; The coating amount of the concrete surface sealant and curing agent layer is / m 2， Furthermore, the concrete surface sealant layer also contains / m 2的 Non-metallic wear-resistant aggregate.

[0008] A basement floor waterproofing structure is disclosed in patent document CN 217231962U, which is summarized as follows: "It includes plain soil, on which a first rigid waterproof layer, a graded crushed stone drainage layer, a second rigid waterproof layer, and a surface layer are laid sequentially from bottom to top on the surface of the plain soil. A support layer is provided within the graded crushed stone drainage layer to prevent the crushed stones from becoming too dense. The support layer consists of several support plates, and a receiving groove is formed between adjacent support plates to accommodate some of the crushed stones in the graded crushed stone drainage layer. The tops of the support plates are connected to the bottom surface of the second rigid waterproof layer, and the bottoms of the support plates are connected to the top surface of the first rigid waterproof layer."

[0009] In the above technical solution, the floor is made by combining two rigid waterproof layers with a gravel layer, and the waterproofing purpose is mainly achieved through the two rigid waterproof layers. However, the rigid waterproof layers in this technical solution are made of prefabricated components, which will undoubtedly increase the production and manufacturing costs, and also put forward higher technical requirements for the workers when laying the waterproof layers on site.

[0010] The parking lot floor structure proposed in this invention does not impose special requirements on its constituent components. Instead, it innovatively considers the load-bearing capacity index of the waterproof layer in advance during the material selection process. Furthermore, it achieves the strength target of the entire floor structure by setting a steel-concrete structure under the surface layer. Therefore, the parking lot floor structure proposed in this invention is obviously easier to implement and will not increase production and manufacturing costs. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the method for testing the bearing capacity of the hydrophobic layer of the underground parking lot floor as shown in this invention.

[0012] In the diagram: 1. Drainage board; 2. Formwork; 3. Concrete; 4. Vibrator; 5. Drainage layer sample after demolding; 6. Force gauge; 7. Drainage layer sample; 8. Convex cup. Detailed Implementation

[0013] The technical solutions of the embodiments of this application 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 this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection claimed in this application.

[0014] Example 1 like Figure 1 As shown, a method for testing the bearing capacity of the drainage layer of an underground parking lot floor includes... Step 1: Prepare several hydrophobic layer samples 7; Step 2: Press the hydrophobic layer sample 7 described in Step 1 with a force gauge 6 and obtain test data; Step 3: Record the test data of hydrophobic layer sample 7 and determine the stress limit value of hydrophobic layer sample 7; Step 4: Select sample 7 of the hydrophobic layer, whose stress limit value meets the design requirements of the hydrophobic layer of the parking lot floor, as the formal product for laying the hydrophobic layer of the parking lot floor.

[0015] The above-mentioned method for testing the bearing capacity of the hydrophobic layer of the underground parking lot floor slab, including the preparation method of hydrophobic layer sample 7, comprises: Step 1.1: According to the design load requirements of the bottom plate's hydrophobic layer, select hydrophobic plates 1 with different cup opening diameters and cut them into squares; Step 1.2: According to the cut dimensions of the drainage board, use a wooden template to make a casting box 2 and put the drainage board 1 described in step 1.1 into the casting box 2; Step 1.3: Pour concrete 3 into the casting box 2 according to the design mix ratio and vibrate it with a vibrator 4 to finally form a hydrophobic layer sample 7. Step 1.4: Curing the hydrophobic layer sample 5 after demolding.

[0016] As can be seen from the above embodiments, before constructing the parking lot floor, a sample of its hydrophobic layer can be made in proportion and its performance tested to ensure that the overall floor performance after large-scale construction meets the design requirements.

[0017] Example 2 Example 2 is a floor structure for an underground parking lot after selecting the hydrophobic layer based on the detection method described in Example 1. The structure, from bottom to top, includes a reinforced concrete waterproof base slab, a pure cement slurry layer, a fine stone concrete layer, a hydrophobic layer, a C30 fine stone concrete layer, and a concrete surface sealing and curing agent layer.

[0018] in: 1) The thickness of the fine aggregate concrete layer shall not be less than 1% and it shall be sloped at 1% towards the surrounding drainage ditches; 2) The pure cement slurry layer contains 3% 108 adhesive; 3) The C30 fine aggregate concrete layer is of thickness, and a ∅6@150 steel reinforcement layer is set in it; 4) The coating amount of the concrete surface sealing and curing agent layer is / m2, and the concrete surface sealing and curing agent layer also contains / m2 of non-metallic wear-resistant aggregate; 5) Drainage board refers to high-density polyethylene plastic drainage board.

[0019] The parking lot floor structure proposed in Embodiment 2 takes into account the load-bearing capacity index of the waterproof layer in advance, and achieves the strength target of the entire floor structure by setting a steel-concrete structure under the surface layer. Therefore, it is easier to implement, does not increase production and manufacturing costs, and can ensure that the quality of the finished floor meets the design requirements.

[0020] The above are merely embodiments provided in this application and are not intended to limit this application. Although this application has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for testing the bearing capacity of the drainage layer of an underground parking lot floor slab, characterized in that: include Step 1: Prepare several hydrophobic layer samples; Step 2: Press the hydrophobic layer sample described in Step 1 using a force gauge and obtain the test data; Step 3: Record the test data of the hydrophobic layer sample and determine the stress limit value of the hydrophobic layer sample; Step 4: Select a hydrophobic layer sample whose stress limit value meets the design requirements of the hydrophobic layer of the parking lot floor as the formal product for laying the hydrophobic layer of the parking lot floor.

2. The method for testing the bearing capacity of the drainage layer of the underground parking lot floor slab according to claim 1, characterized in that: In step 1, the method for preparing the hydrophobic layer sample includes: Step 1.1: Based on the design load requirements of the bottom slab's drainage layer, select drainage plates with different cup opening diameters and cut them into squares; Step 1.2: Based on the cut dimensions of the drainage board, use a wooden template to make a casting box and place the drainage board described in Step 1.1 inside the casting box; Step 1.3: Pour concrete into the casting box according to the design mix ratio and vibrate it with a vibrator to finally form a hydrophobic layer sample; Step 1.4: Curing of the hydrophobic layer sample.

3. The method for testing the bearing capacity of the drainage layer of the underground parking lot floor slab according to claim 1 or 2, characterized in that: Drainage board refers to high-density polyethylene plastic drainage board.

4. A ground structure for an underground parking lot as described in claim 1 or 2, characterized in that: From bottom to top, the layers consist of a reinforced concrete waterproof base slab, a pure cement slurry layer, a fine aggregate concrete layer, a drainage layer, a C30 fine aggregate concrete layer, and a concrete surface sealing and curing agent layer. The thickness of the fine aggregate concrete layer is not less than 1%, and it slopes towards the surrounding drainage ditches at a rate of 1%.

5. The ground structure of the underground parking lot according to claim 4, characterized in that: The pure cement slurry layer contains 3% 108 adhesive.

6. The ground structure of the underground parking lot according to claim 4, characterized in that: C3 The thickness of the fine aggregate concrete layer is 0, and a steel reinforcement layer of ∅6@150 is set in it.

7. The floor structure of the underground parking lot according to claim 4, characterized in that: concrete... The coating amount of the surface sealing and curing agent layer is / m 2， Furthermore, the concrete surface sealant layer also contains / m 2的 Non-metallic wear-resistant aggregate.

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