Construction method for building floor

Abstract

The application belongs to the technical field of building construction, and discloses a kind of building floor construction method.The building floor construction method comprises the following steps: S1, the foundation pit is divided into first layer, second layer, third layer and fourth layer from bottom to top in turn, and a support structure is arranged in the third layer, which divides the third layer into a plurality of grid sub-chambers; then, a detection assembly is installed below the support structure; S2, low fluidity concrete is poured into the first layer; S3, low fluidity concrete is poured into the second layer, and the detection assembly is used to detect the vibration uniformity of the concrete in the second layer; S4, according to the first pouring construction parameter, the plurality of grid sub-chambers are divided into a plurality of pouring areas, each pouring area comprises a plurality of connected grid sub-chambers; high fluidity concrete is poured into each pouring area; S5, low fluidity concrete is poured into the fourth layer. The building floor construction method improves the construction reliability of the building floor, the concrete forming quality and the construction efficiency.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a method for constructing a building foundation slab. Background Technology

[0002] With the continuous development of urban high-rise and super high-rise buildings, large underground space structures, and heavy equipment foundations, ultra-thick foundation slabs have become key load-bearing components in structural systems, typically with a thickness of no less than 1.5 meters. These ultra-thick foundation slabs fall under the category of large-volume concrete construction. During actual construction, the concrete is prone to significant temperature stress and shrinkage deformation due to the heat of hydration, leading to temperature and shrinkage cracks, which severely affect the structure's integrity, durability, and impermeability. Furthermore, if a one-time full-thickness pouring method is used, it can easily result in quality and safety hazards such as insufficient concrete compaction, aggregate segregation, and excessive lateral pressure on the formwork.

[0003] To address the aforementioned issues, patent CN119933178A, "A Structural Base Slab and Its Construction Method," discloses a method for layered concrete pouring of an ultra-thick base slab. This method utilizes a grid-like support structure within the ultra-thick base slab to facilitate subsequent concrete pouring while simultaneously constraining the concrete and reducing the risk of cracking. However, in practical engineering applications, this layered pouring method still suffers from several technical drawbacks: Firstly, the presence of the grid-like support structure hinders the construction personnel's direct observation of the concrete pouring and flow status beneath the support structure, easily leading to insufficient vibration and edge slurry bleeding in the area below the support structure, directly affecting the base slab's forming quality. Secondly, due to the obstruction of the support structure, it is difficult to achieve synchronous and uniform concrete pouring within each grid, further reducing the overall construction quality and structural reliability of the base slab.

[0004] Therefore, there is an urgent need for a construction method for building foundation slabs to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a construction method for building foundation slabs, which improves the construction reliability, concrete forming quality and construction efficiency of building foundation slabs.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A method for constructing a building foundation slab is provided, wherein the building foundation slab is constructed and formed within a foundation pit. The method for constructing the building foundation slab includes the following steps:

[0008] S1. Divide the foundation pit into four layers, namely the first layer, the second layer, the third layer, and the fourth layer, which are connected from bottom to top. Set up a support structure in the third layer, which divides the third layer into multiple grid compartments. Then, install the detection components below the support structure.

[0009] S2. Pour low-flow concrete into the first layer;

[0010] S3. Pour low-flowability concrete into the second layer and use the testing components to test the uniformity of vibration of the concrete in the second layer.

[0011] S4. According to the first pouring construction parameters, the multiple grid compartments are divided into multiple pouring areas, and each pouring area includes multiple connected grid compartments; then, high-flowability concrete is poured in each pouring area.

[0012] S5. Pour low-flowability concrete into the fourth layer.

[0013] Optionally, the detection components include a height measuring element;

[0014] In step S1, the height measuring device is installed on the second layer;

[0015] Step S3 specifically includes the following steps:

[0016] S31. Pour low-flow concrete into the second layer;

[0017] S32. Measure the pouring height h of the concrete in the second layer using a height measuring device, and calculate the volume V1 of the concrete to be poured in the second layer based on the pouring height h. Determine the actual volume V2 of the concrete to be poured in the second layer based on the second pouring construction parameters.

[0018] S33. Determine the magnitudes of V1 and V2. If V1 is not greater than V2, the uniformity of vibration of the concrete in the second layer meets the requirements; if V1 is greater than V2, the uniformity of vibration of the concrete in the second layer does not meet the requirements.

[0019] Optionally, in step S32, the relationship between the volume V1 of concrete to be poured in the second layer and the pouring height h is as follows:

[0020] V1 = S × hA × L;

[0021] Where S is the cross-sectional area of ​​the second layer; A is the cross-sectional area A of the reinforcing bars in the second layer; and L is the length of the reinforcing bars in the second layer.

[0022] In step S32, the second pouring construction parameters include the concrete pouring flow rate Q and the pouring time t1 of the second layer of concrete. The relationship between the actual volume V2 of the second layer of concrete and the pouring flow rate Q and pouring time t1 is as follows:

[0023] V2 = Q × t1.

[0024] Optionally, the detection assembly includes multiple pressure sensing elements;

[0025] In step S1, multiple pressure testing elements are installed in a matrix below the support structure;

[0026] In step S3, multiple pressure testing devices are used to detect the pressure of the concrete in the second layer, and the pressure values ​​detected by the multiple pressure testing devices are compared to see if they are equal. If multiple pressure values ​​are equal, the vibration uniformity of the concrete in the second layer meets the requirements. If at least two pressure values ​​are not equal, the vibration uniformity of the concrete in the second layer does not meet the requirements.

[0027] Optionally, the first pouring construction parameters include the number of concrete pump trucks N1, the concrete pouring speed v, and the allowable continuous pouring time t2.

[0028] Step S4 specifically includes the following steps:

[0029] S41. Determine the maximum concrete pouring volume V3 at the construction site based on the number of pump trucks N1, the pouring speed v, and the allowable continuous pouring time t2.

[0030] V3≤N1×v×t2;

[0031] S42, based on the maximum pouring volume V3 and the volume V of each grid compartment. i The multiple grid compartments are divided into multiple pouring zones, and each pouring zone includes n grid compartments. The relationship between the number of grid compartments n in each pouring zone and the maximum pouring volume V3 is as follows:

[0032] .

[0033] Optionally, in step S41, the allowable continuous pouring time t2 is controlled to be less than the initial setting time of the concrete T;

[0034] in, .

[0035] Optionally, step S2 specifically includes the following steps:

[0036] S21. Low-flowability concrete is delivered to the first layer, forming a trapezoidal column within the first layer;

[0037] S22. With the trapezoidal column as the center, pour low-flow concrete along the circumference of the trapezoidal column into the first layer, and the newly poured concrete will wrap the trapezoidal column.

[0038] S23. With the trapezoidal column as the center, pour low-flow concrete along the circumference of the trapezoidal column into the first layer, and make the newly poured concrete wrap around the already poured concrete.

[0039] S24. Repeat step S23 until the first layer is filled with concrete.

[0040] Optionally, the cross-sectional shape of the support structure is rectangular. In step S5, multiple casting areas are cast in sequence, starting with the corners, then the four sides, and finally the center.

[0041] Optionally, in step S3, if the vibration uniformity detected by the detection component does not meet the requirements, the following steps are performed:

[0042] The locations of uneven concrete compaction in the second layer are determined based on the data detected by the testing components; subsequently, the locations of uneven compaction are vibrated again.

[0043] Optionally, the steps after step S2 and before step S3, as well as the steps after step S3 and before step S4, include the following:

[0044] Measure the setting strength of the concrete, and proceed to the next step while the setting strength of the concrete is below a predetermined percentage of the initial setting strength.

[0045] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0046] This invention provides a construction method for building foundation slabs. Low-flow concrete, characterized by low slump and low fluidity, can achieve dense compaction without relying on high-intensity vibration. Using this type of concrete in the first and second layers beneath the supporting structure effectively reduces problems such as insufficient vibration and edge bleeding caused by inconvenient observation and inadequate vibration, thus improving the construction reliability of the building foundation slab. Using this type of concrete in the fourth layer, the top surface of the building foundation slab, can fundamentally reduce the occurrence of edge bleeding, exposed sand, honeycomb pitting, and other phenomena at the edges and corners, improving the forming quality and appearance flatness of the building foundation slab, facilitating its connection with other structures. The detection component can detect the vibration uniformity of the second layer of concrete, further reducing the probability of construction defects caused by uneven vibration in the concrete beneath the supporting structure. Even if construction personnel misjudge the vibration uniformity of the concrete by observing the surface condition, due to obstructed vision, the detection component can still provide objective and accurate judgment, effectively improving the quality control precision and construction reliability of the building foundation slab. When pouring the third layer, a zoned pouring method was adopted, and high-flowability concrete was selected. Zoned pouring avoids the uneven pouring that occurs with large-area pouring, improving the controllability of construction. High-flowability concrete itself has excellent filling properties, achieving good filling even in narrow grid compartments and corner areas, thus improving the concrete forming quality and construction efficiency of the third layer. In addition, multiple grid compartments in each pouring area are interconnected, enabling continuous and smooth pouring of multiple grid compartments within the same pouring area, effectively improving on-site construction convenience and efficiency. Attached Figure Description

[0047] Figure 1A flowchart of the building foundation slab construction method provided by the present invention;

[0048] Figure 2 A schematic diagram of the foundation pit to which the construction method for the building foundation slab provided by the present invention is applicable;

[0049] Figure 3 This is a plan view of the support structure after the pressure testing device is installed under the support structure according to the building foundation construction method provided by the present invention;

[0050] Figure 4 This is a schematic diagram of pouring concrete into the first layer according to the construction method of the building foundation slab provided by the present invention;

[0051] Figure 5 This is a schematic diagram showing the concrete pouring process in the first layer according to the building foundation slab construction method provided by the present invention.

[0052] Figure 6 This is a schematic diagram showing the concrete pouring process in the second layer according to the building foundation slab construction method provided by the present invention.

[0053] Figure 7 This is a schematic diagram showing the concrete poured in the third floor according to the construction method of the building foundation slab provided by the present invention.

[0054] Figure 8 This is a schematic diagram showing the concrete poured in the fourth floor according to the building foundation slab construction method provided by the present invention.

[0055] Figure 9 This is a schematic diagram illustrating the sequence of pouring concrete into multiple pouring areas according to the building foundation slab construction method provided by the present invention.

[0056] In the picture:

[0057] 10. Foundation pit; 11. First floor; 12. Second floor; 13. Third floor; 14. Fourth floor;

[0058] 20. Supporting structure; 21. Grid compartmentation;

[0059] 30. Detection components; 31. Height measuring components; 32. Pressure measuring components. Detailed Implementation

[0060] The present invention 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, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0061] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0062] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0063] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0064] like Figures 1 to 9 As shown, this embodiment provides a construction method for building foundation slabs, which improves the construction reliability, concrete forming quality, and construction efficiency of building foundation slabs.

[0065] The building foundation slab is constructed and formed within the foundation pit 10. The construction method for the building foundation slab includes the following steps:

[0066] S1, see reference Figure 2 , Figure 3 and Figure 4 The foundation pit 10 is divided into a first layer 11, a second layer 12, a third layer 13 and a fourth layer 14 connected from bottom to top. A support structure 20 is set in the third layer 13, which divides the third layer 13 into multiple grid compartments 21. Then, a detection component 30 is installed below the support structure 20.

[0067] S2, see reference Figure 4 and Figure 5 Low-flowability concrete was poured into the first layer 11;

[0068] S3, see reference Figure 6 Low-flowability concrete is poured into the second layer 12, and the vibration uniformity of the concrete in the second layer 12 is detected by the detection component 30.

[0069] S4, see reference Figure 3 and Figure 7 According to the first pouring construction parameters, the multiple grid compartments 21 are divided into multiple pouring areas, and each pouring area includes multiple connected grid compartments 21; then, high-flowability concrete is poured in each pouring area.

[0070] S5, see reference Figure 8 Low-flowability concrete was poured into the fourth layer, 14.

[0071] The building foundation slab construction method provided in this embodiment utilizes low-flow concrete, characterized by low slump and low fluidity. This allows for compaction without relying on high-intensity vibration. Using this type of concrete in the first layer 11 and second layer 12 below the supporting structure 20 effectively reduces problems such as insufficient vibration and edge bleeding caused by inconvenient observation and inadequate vibration, thus improving the construction reliability of the building foundation slab. Using this type of concrete in the fourth layer 14, which forms the top surface of the building foundation slab, can fundamentally reduce the occurrence of edge bleeding, exposed sand, honeycomb pitting, and other defects at the edges and corners, improving the forming quality and smoothness of the building foundation slab and facilitating its connection with other structures. The detection component 30 can detect the vibration uniformity of the second layer 12 concrete, further reducing the probability of construction defects caused by uneven vibration in the concrete below the supporting structure 20. Even if construction personnel misjudge the vibration uniformity of the concrete by observing the surface condition due to obstructed vision, the detection component 30 still provides objective and accurate judgment, effectively improving the quality control accuracy and construction reliability of the building foundation slab. When pouring the third layer 13, a zoned pouring method was adopted, and high-flowability concrete was selected. Zoned pouring avoids the uneven pouring phenomenon caused by large-area pouring and improves the controllability of construction. High-flowability concrete itself has excellent filling properties, and can still achieve good filling in narrow grid compartments 21 and corner areas, improving the concrete forming quality and construction efficiency in the third layer 13. In addition, multiple grid compartments 21 in each pouring area are interconnected, which can realize continuous and smooth pouring of multiple grid compartments 21 in the same pouring area, effectively improving the convenience and efficiency of on-site construction.

[0072] For example, the slump of the low-flow concrete poured in the first layer 11, the second layer 12 and the fourth layer 14 is controlled between 50mm and 100mm. Within this slump range, the concrete has low flowability, is not prone to bleeding and slurry, and has good molding stability. This can reduce the reliance on vibration operations, effectively avoid problems such as insufficient vibration and edge slurry due to obstructed vision, and improve the molding quality and density of the building base slab.

[0073] The slump of the low-flow concrete poured in the fourth layer 14 can be the same as or different from the slump of the low-flow concrete poured in the first layer 11 and the second layer 12.

[0074] For example, the slump of the high-flowability concrete poured in the third layer 13 is controlled between 160mm and 210mm. Within this slump range, the concrete has excellent filling performance and flows smoothly. It can automatically fill and compact in narrow spaces and corner areas, reduce vibration intensity, avoid defects such as honeycomb, pitting, and missed vibration, and improve construction efficiency and structural integrity.

[0075] Optionally, step S1 specifically includes the following steps:

[0076] S11, Excavation of foundation pit 10;

[0077] S12. Reinforcing bars for the building base slab and reinforcing bars for the supporting structure 20 are arranged in the foundation pit 10, and cooling pipes are arranged in the third floor 13.

[0078] S13. Cast the supporting structure 20 in the third layer 13;

[0079] S14. Install the detection component 30 below the support structure 20.

[0080] In some embodiments, when pouring concrete into the fourth layer 14, cooling water is introduced into the cooling pipe. The cooling water can dissipate the heat of hydration accumulated in the concrete, thereby reducing the temperature difference between the inside and outside of the fourth layer 14 concrete and preventing temperature cracks from forming.

[0081] Optionally, see Figure 4 Step S2 specifically includes the following steps:

[0082] S21. Low-flowability concrete is delivered to the first layer 11, forming a trapezoidal column within the first layer 11;

[0083] S22. With the trapezoidal column as the center, pour low-flow concrete along the circumference of the trapezoidal column into the first layer 11, and the newly poured concrete will wrap the trapezoidal column.

[0084] S23. With the trapezoidal column as the center, pour low-flow concrete along the circumference of the trapezoidal column into the first layer 11, and make the newly poured concrete wrap around the already poured concrete.

[0085] S24. Repeat step S23 until the first layer 11 is filled with concrete.

[0086] Low-flowability concrete is characterized by low slump and low fluidity. Therefore, after it is poured into the first layer, it will not spread out over a large area, allowing workers to perform vibration operations only in a small area, effectively solving the problem of insufficient manpower for vibration on the construction site.

[0087] In an optional embodiment, see [link to relevant documentation] Figure 4 The detection component 30 includes a height measuring element 31.

[0088] For example, the height measuring component 31 employs an elevation meter, which is typically used to measure the relative elevation of a component.

[0089] In this embodiment, see Figure 4 In step S1, the height measuring component 31 is installed on the second layer 12;

[0090] In this embodiment, see Figure 6 Step S3 specifically includes the following steps:

[0091] S31. Pour low-flow concrete into the second layer 12;

[0092] S32. Measure the pouring height h of the concrete in the second layer 12 using the height measuring device 31, and calculate the volume V1 of the concrete to be poured in the second layer 12 based on the pouring height h. Determine the actual volume V2 of the concrete poured in the second layer 12 based on the second pouring construction parameters.

[0093] S33. Determine the size of V1 and V2. If V1 is not greater than V2, the uniformity of vibration of the concrete in the second layer 12 meets the requirements; if V1 is greater than V2, the uniformity of vibration of the concrete in the second layer 12 does not meet the requirements.

[0094] Wherein, V1 is the theoretical volume of the second layer 12 space. When V1 is greater than V2, it means that the concrete has not completely filled the space of the second layer 12. The concrete cannot form sufficient lateral pressure and compaction pressure in the second layer 12, and the uniformity of concrete vibration cannot meet the requirements.

[0095] In this embodiment, in step S32, the relationship between the volume V1 of concrete to be poured in the second layer 12 and the pouring height h is as follows:

[0096] V1 = S × hA × L;

[0097] Where S is the cross-sectional area of ​​the second layer 12; A is the cross-sectional area A of the reinforcing bars in the second layer 12; and L is the length of the reinforcing bars in the second layer 12.

[0098] In other words, the volume V1 of concrete to be poured in the second layer 12 is the difference between the volume of the second layer 12 and the volume of the reinforcing steel in the second layer 12. The cross-sectional area S of the second layer 12, the cross-sectional area A of the reinforcing steel in the second layer 12, and the length L of the reinforcing steel in the second layer 12 can all be obtained from the design drawings of the building foundation slab.

[0099] In this embodiment, in step S32, the second pouring construction parameters include the concrete pouring flow rate Q and the pouring time t1 of the second layer 12 concrete. The relationship between the actual poured volume V2 of the second layer 12 concrete and the pouring flow rate Q and pouring time t1 is as follows:

[0100] V2 = Q × t1.

[0101] The concrete pouring flow rate Q is mainly related to factors such as the concrete's own workability, the performance of the pouring equipment, the pouring method, and the structural conditions of the pouring area. The concrete pouring flow rate Q can be determined when the concrete is transported to the construction site by a pump truck.

[0102] The pouring time t1 is the time required to pour a high layer of concrete (h height) within the second layer 12.

[0103] In some embodiments, when pouring the second layer 12 of concrete, a layered pouring method is adopted, that is, the pouring height h of each pour is less than the actual height H of the second layer 12.

[0104] Specifically, in step S31, low-flowability concrete with a height of h is poured into the second layer 12; after step S33, the following steps are also included: S34, repeat steps S31 to S33 until the second layer 12 is completely poured.

[0105] In another alternative embodiment, see [link to relevant documentation]. Figure 4 The detection component 30 includes multiple pressure detection elements 32.

[0106] For example, the pressure detection element 32 employs a pressure sensor.

[0107] In this embodiment, see Figure 3 In step S1, multiple pressure detection elements 32 are installed in a matrix below the support structure 20.

[0108] In step S3, multiple pressure testing devices 32 are used to detect the pressure of the concrete in the second layer 12, and the pressure values ​​detected by the multiple pressure testing devices 32 are compared to see if they are equal. If multiple pressure values ​​are equal, the vibration uniformity of the concrete in the second layer 12 meets the requirements. If at least two pressure values ​​are not equal, the vibration uniformity of the concrete in the second layer 12 does not meet the requirements.

[0109] This arrangement allows multiple pressure testing elements 32 to be evenly distributed at the second layer 12. In subsequent testing, construction personnel can intuitively and quickly determine the location of uneven vibration of the second layer 12 concrete by comparing the pressure values ​​detected by multiple pressure testing elements 32, so that construction personnel can quickly and specifically deal with the problem, thus improving construction efficiency.

[0110] Optionally, in step S3, if the vibration uniformity detected by the detection component 30 does not meet the requirements, the following steps are performed:

[0111] Based on the data detected by the detection component 30, the location of uneven concrete compaction in the second layer 12 is determined; subsequently, the unevenly compacted location is compacted again.

[0112] When the uniformity of concrete vibration does not meet the requirements, it indicates that the concrete has not completely filled the space of the second layer (12). This can easily lead to slurry rising to the surface and aggregate settling and accumulating, resulting in aggregate blockage in some areas. This severely affects the overall uniformity, density, and molding quality of the concrete. To ensure the quality of the concrete molding, it is necessary to vibrate the areas where the concrete vibration was uneven again.

[0113] In this embodiment, the detection component 30 includes a height measuring element 31 and multiple pressure measuring elements 32. The data measured by the height measuring element 31 can determine whether the concrete in the second layer 12 is vibrated evenly. The data detected by the pressure measuring elements 32 can determine the location of uneven vibration of the concrete in the second layer 12. Subsequently, vibration can be carried out in a targeted manner based on the data detected by the pressure measuring elements 32, which is convenient and quick to operate.

[0114] Optionally, the first pouring construction parameters include the number of concrete pump trucks N1, the concrete pouring speed v, and the allowable continuous pouring time t2.

[0115] Step S4 specifically includes the following steps:

[0116] S41. Determine the maximum concrete pouring volume V3 at the construction site based on the number of pump trucks N1, the pouring speed v, and the allowable continuous pouring time t2.

[0117] V3≤N1×v×t2.

[0118] The number of pump trucks N1 arriving at the construction site is determined based on the specific circumstances, and the concrete pumping speed v of each pump truck is determined based on the specific specifications of the pump truck.

[0119] S42, based on the maximum pouring volume V3 and the volume V of each grid compartment 21. iThe multiple grid compartments 21 are divided into multiple pouring areas, and each pouring area includes n grid compartments 21. The relationship between the number of grid compartments 21 n in each pouring area and the maximum pouring volume V3 is as follows:

[0120] .

[0121] When dividing the pouring area, the total volume of the n grid compartments 21 in each pouring area should not exceed the maximum pouring volume V3 of concrete at the construction site, so as to ensure that multiple pump trucks can complete the pouring of a pouring area within the allowed continuous pouring time t2.

[0122] Each grid compartment 21 is a cubic structure, and its volume V can be obtained by measuring its length, width, and height. i .

[0123] In this embodiment, in step S41, the allowable continuous pouring time t2 is controlled to be less than the initial setting time of concrete T;

[0124] in, .

[0125] This operation ensures that each pouring section can be completed before the concrete initially sets, thus avoiding quality problems such as construction joints.

[0126] Specifically, the multiple grid compartments 21 are first pre-divided to obtain multiple pouring areas; then, the multiple pouring areas are verified, that is, based on the pouring speed v, the initial setting time T, and the volume V of the n grid compartments 21 within the verified pouring area. i Calculate the allowable continuous pouring time t2; if the relationship between the allowable continuous pouring time t2 and the initial setting time T cannot be satisfied according to the current division method, the division method of the pouring area is adjusted until it is satisfied; next, calculate the maximum pouring volume V3 based on the continuous pouring time t2, the number of pump trucks N1, and the pouring speed v; finally, compare the maximum pouring volume V3 with the volume V of the multiple grid compartments 21 of the verified pouring area. i If the relationship between the sums meets the requirements, then the multiple pouring areas can be divided according to the current division method. If not, then the division method of the pouring areas should be adjusted.

[0127] Optionally, see Figure 9The cross-sectional shape of the support structure 20 is rectangular. In step S5, multiple pouring areas are poured sequentially in the order of first the corners, then the four sides, and finally the center. The corners are the key stress-bearing areas of the support structure 20. The corners poured first can provide stable support for the subsequent pouring of other parts, effectively preventing the concrete from being squeezed towards the corners during subsequent pouring, causing corner grouting and honeycombing. After the four sides are poured, a closed cofferdam can be formed at the third layer 13, so that the concrete poured in the center will not flow outwards. With the four sides already formed, the concrete poured towards the center will settle and shrink freely, thus ensuring that cracks will only appear in the center of the support structure 20, i.e., the non-critical stress area. In addition, it also allows the laitance and water to be concentrated in the middle, which is convenient for secondary vibration.

[0128] Specifically, when casting the corners, you can first cast the two corners located on a diagonal line, and then cast the other corners, four sides and center in sequence along this diagonal line from the edge to the center.

[0129] For example, see Figure 9 In the middle direction, first pour the area filled with diagonal lines, then pour the area filled with triangles, then pour the area filled with cross lines, then pour the area filled with L lines, and finally pour the area filled with horizontal dotted lines.

[0130] Optionally, the steps after step S2 and before step S3, as well as after step S3 and before step S4, include the following steps:

[0131] Measure the setting strength of the concrete, and proceed to the next step while the setting strength of the concrete is below a predetermined percentage of the initial setting strength.

[0132] This operation allows the pouring of the previous layer of concrete to begin before the next layer has set, thus ensuring that the two adjacent layers of concrete can form a whole and improving the integrity of the building's foundation slab.

[0133] For example, the preset percentage is 5%.

[0134] In this embodiment, the setting strength of concrete is measured using the Magnum needle penetration method. Specifically, a flat measuring point with no exposed aggregate is selected on the concrete surface, and the steel needle of the Magnum needle penetrator is pressed into the concrete at a uniform speed. The Magnum needle penetrator can then display the corresponding penetration force, thereby obtaining the setting strength of the concrete.

[0135] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A construction method for a building foundation slab, wherein the building foundation slab is constructed and formed within a foundation pit (10), characterized in that, The construction method for the building's foundation slab includes the following steps: S1. Divide the foundation pit (10) into a first layer (11), a second layer (12), a third layer (13) and a fourth layer (14) connected from bottom to top, and set a support structure (20) in the third layer (13). The support structure (20) divides the third layer (13) into multiple grid compartments (21). Then, install a detection component (30) below the support structure (20). S2. Pour low-flowability concrete into the first layer (11); S3. Pour low-flowability concrete into the second layer (12) and use the detection component (30) to detect the vibration uniformity of the concrete in the second layer (12); S4. According to the first pouring construction parameters, the multiple grid compartments (21) are divided into multiple pouring areas, and each pouring area includes multiple connected grid compartments (21); then, high-flowability concrete is poured in each pouring area. The first pouring construction parameters include the number of concrete pump trucks N1, the concrete pouring speed v, and the allowable continuous pouring time t2. Step S4 specifically includes the following steps: S41. Determine the maximum concrete pouring volume V3 at the construction site based on the number of pump trucks N1, the pouring speed v, and the allowable continuous pouring time t2. V3≤N1×v×t2; In step S41, the allowable continuous pouring time t2 is controlled to be less than the initial setting time of the concrete T; in, ; S42, based on the maximum pouring volume V3 and the volume V of each of the grid compartments (21) i The multiple grid compartments (21) are divided into multiple casting areas, and each casting area includes n grid compartments (21). The relationship between the number n of grid compartments (21) in each casting area and the maximum casting volume V3 is as follows: ； S5. Pour low-flowability concrete into the fourth layer (14).

2. The construction method for building foundation slab according to claim 1, characterized in that, The detection component (30) includes a height measuring element (31); In step S1, the height measuring component (31) is installed on the second layer (12). Step S3 specifically includes the following steps: S31. Pour low-flowability concrete into the second layer (12); S32. Measure the pouring height h of the concrete in the second layer (12) using the height measuring device (31), calculate the volume V1 of the concrete to be poured in the second layer (12) based on the pouring height h, and determine the actual volume V2 of the concrete poured in the second layer (12) based on the second pouring construction parameters. In step S32, the relationship between the volume V1 of concrete to be poured in the second layer (12) and the pouring height h is as follows: V1 = S × hA × L; Where S is the cross-sectional area of ​​the second layer (12); A is the cross-sectional area A of the reinforcing bars in the second layer (12); and L is the length of the reinforcing bars in the second layer (12). In step S32, the second pouring construction parameters include the concrete pouring flow rate Q and the pouring time t1 of the second layer (12) concrete. The relationship between the actual volume V2 of the concrete poured in the second layer (12) and the pouring flow rate Q and the pouring time t1 is as follows: V2 = Q × t1; S33. Determine the size of V1 and V2. If V1 is not greater than V2, then the uniformity of vibration of the concrete in the second layer (12) meets the requirements; if V1 is greater than V2, then the uniformity of vibration of the concrete in the second layer (12) does not meet the requirements.

3. The construction method for building foundation slab according to claim 1, characterized in that, The detection component (30) includes multiple pressure detection elements (32); In step S1, multiple pressure detection elements (32) are installed in a matrix below the support structure (20); In step S3, the pressure of the concrete in the second layer (12) is detected by multiple pressure testing devices (32), and the pressure values ​​detected by the multiple pressure testing devices (32) are compared to see if they are equal. If the multiple pressure values ​​are equal, the vibration uniformity of the concrete in the second layer (12) meets the requirements. If at least two of the pressure values ​​are not equal, the vibration uniformity of the concrete in the second layer (12) does not meet the requirements.

4. The construction method for building foundation slab according to claim 1, characterized in that, Step S2 specifically includes the following steps: S21. Low-flowability concrete is delivered to the first layer (11), and a trapezoidal column is formed in the first layer (11); S22. With the trapezoidal column as the center, low-flow concrete is poured into the first layer (11) along the circumference of the trapezoidal column, and the newly poured concrete encloses the trapezoidal column. S23. With the trapezoidal column as the center, pour low-flow concrete along the circumference of the trapezoidal column into the first layer (11), and make the newly poured concrete wrap the already poured concrete. S24. Repeat step S23 until the first layer (11) is filled with concrete.

5. The construction method for building foundation slab according to claim 1, characterized in that, The cross-sectional shape of the support structure (20) is rectangular. In step S5, multiple casting areas are cast in sequence, first the corners, then the four sides, and finally the center.

6. The construction method for building foundation slab according to claim 1, characterized in that, In step S3, when the vibration uniformity detected by the detection component (30) does not meet the requirements, the following steps are performed: The location of uneven concrete compaction in the second layer (12) is determined based on the data detected by the detection component (30); then, the unevenly compacted location is compacted again.

7. The construction method for building foundation slabs according to any one of claims 1-6, characterized in that, The steps following are included both after step S2 and before step S3, and after step S3 and before step S4: Measure the setting strength of the concrete, and perform the next step while the setting strength of the concrete is below a preset percentage of the initial setting strength.

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