Cast-in-place concrete hollow floor self-supporting type square box-shaped core mold positioning anti-floating construction method
By tapping the self-tapping screws at the bottom of the square box core mold of the hollow floor cover in cast-in-place concrete, and combining the setting of the anti-adhesive pad, the problem of the core mold floating during concrete injection is solved, and the effect of improving the structural strength of the hollow floor cover is achieved.
Patent Information
- Application Number
- CN202510174772.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-18
- Publication Date
- 2025-06-06
AI Technical Summary
In the prior art, the core mold of the hollow floor cover of cast-in-place concrete is prone to float when concrete is injected, causing the core mold to deviate from its original position and reduce the structural strength of the hollow floor cover.
The self-supported square box core mold positioning and anti-floating construction method is adopted. By tapping the self-tapping screws at the bottom of the square box core mold, combined with the setting of the anti-adhesive pad, the core mold does not float or float left and right when pouring concrete, thereby fixing the core mold position.
It effectively enhances the anti-floating ability of the square box core mold, improves the structural strength and molding quality of the hollow floor, and avoids the structural strength reduction caused by the deviation of the core mold from its position.
Smart Images
Figure CN120100183A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of building construction, and in particular to a method for positioning and anti-floating construction of a self-supporting square box-shaped core mold for a cast-in-place concrete hollow floor. Background Art
[0002] Traditional industrial building floor designs usually adopt primary and secondary beams or cross-beam structures, but due to the large cross-sectional height of the beams, the net height of the building is often limited, and increasing the floor height will bring unnecessary costs; therefore, in recent years, cast-in-place concrete hollow floor technology has gradually received attention from the industry; this technology is based on the design of component core molds, which effectively meets the needs of industrial plants for large spans and high clearances, and has become a more ideal floor solution.
[0003] The cast-in-place concrete hollow floor is a floor in which a cavity is formed in the floor after the embedded core molds are placed according to certain rules and concrete is poured on site. The "core mold" is an object buried in the cast-in-place concrete hollow floor to form a cavity and is not removed. It is a type of hollow floor technology, which mainly achieves the goal of increasing the calculated height of the slab without increasing the deadweight of the structure by burying lightweight core molds inside the slab, thereby ultimately achieving the purpose of reducing the number of steel bars, reducing the amount of concrete used, and lowering the project cost.
[0004] However, the existing technology still has the following problems: when injecting concrete, the core mold is easy to float in the concrete, causing the core mold to deviate from the original position, thereby reducing the structural strength of the hollow floor. Summary of the invention
[0005] The present application provides a method for positioning and anti-floating construction of a self-supporting square box-shaped core mold for cast-in-place concrete hollow floor slabs, thereby solving the problem in the prior art that when concrete is injected, the core mold is easily floated in the concrete, causing the core mold to deviate from its original position, thereby reducing the structural strength of the hollow floor slab. The application achieves the goal of enhancing the anti-floating ability of the square box-shaped core mold and improving the structural strength of the hollow floor slab.
[0006] The present application provides a self-supporting square box-shaped core mold positioning and anti-floating construction method for cast-in-place concrete hollow floor slabs, including the following construction steps:
[0007] S1, install the lower template;
[0008] S2, tying the rib beam and the floor bottom plate steel mesh, and forming a cavity in the rib beam, wherein the cavity is used to place a square box-shaped core mold, and the lower layer template is located at the bottom of the floor bottom plate steel mesh;
[0009] S3, tying the upper steel mesh of the floor slab above the square box-shaped core mold, and providing a plurality of anti-adhesion pads at the top and bottom of the square box-shaped core mold, wherein the anti-adhesion pads are used to maintain the distance between the upper steel mesh of the floor slab and the steel mesh of the floor bottom slab and the square box-shaped core mold;
[0010] S4, the square box-shaped core mold is divided into two parts, the lower part, and a plurality of self-tapping screws are used to pass through the lower template and fix it to the square box-shaped core mold, and the square box-shaped core molds are fixed by bolts;
[0011] S5, pouring concrete;
[0012] S6. Remove the lower formwork after the concrete solidifies.
[0013] Furthermore, in step 2, the square box-shaped core molds all have independent cavities, and the square box-shaped core molds do not contact the rib beams.
[0014] Furthermore, in the step 3, at least four anti-adhesion pads are provided and evenly distributed at the top and bottom ends of the square box-shaped core mold, the anti-adhesion pads are fixed to the upper steel mesh of the floor slab and the steel mesh of the floor bottom slab by iron wire, and the upper anti-adhesion pads are fixed to the upper steel mesh of the floor slab by using 14# iron wire, so that the upper steel mesh of the floor slab can be lifted up, so that a cushion layer is formed between the upper steel mesh of the floor slab and the top of the square box-shaped core mold, the cushion layer is used for the entry of concrete to form a protective layer on the concrete, and prevents the upper steel mesh of the floor slab from being in close contact with the square box-shaped core mold under the pressure of concrete and the trampling of workers, thereby improving the structural strength of the hollow floor slab.
[0015] The anti-adhesion pad below is still tied to the top of the floor slab steel mesh with 14# iron wire, and the square box core mold is placed after the anti-adhesion pad below is fixed. At this time, a concrete lower protective layer is formed between the square box core mold and the floor slab steel mesh, which facilitates the poured concrete to diffuse and flow around.
[0016] Furthermore, in step S3, by setting the anti-adhesion pad, an upper concrete protective layer is formed between the upper steel mesh of the floor slab and the top of the square box-shaped core mold, and a lower concrete protective layer is formed between the upper steel mesh of the floor slab and the bottom of the square box-shaped core mold.
[0017] Furthermore, in step S4, a plurality of self-tapping screws are provided, and the self-tapping screws are provided in the middle of the outer side of the square box-shaped core mold.
[0018] Furthermore, before performing the step S4, the tapping position of the self-tapping screw is first located and marked, and the self-tapping screw can be passed through the lower template and connected and fixed to the square box-shaped core mold according to the location.
[0019] Furthermore, in S5, while pouring the concrete, the concrete is vibrated by a vibrating rod, and the pouring of the concrete is divided into two pouring steps to improve the density of the concrete.
[0020] Furthermore, in step S6, after removing the lower layer formwork, a grinding machine is used to cut and grind the leaked self-tapping screws. The lower layer formwork can be removed only after the concrete is completely solidified. After removal, excess parts of the self-tapping screws will be leaked. At this time, a grinding machine is used to cut and grind the excess parts to improve the flatness of the bottom of the hollow floor slab.
[0021] The technical solution provided by this application has at least the following technical effects or advantages:
[0022] 1. The present application provides a downward pulling force for the square box-shaped core mold by tapping the self-tapping screws at the bottom of the square box-shaped core mold, and can achieve a fixing effect on the square box-shaped core mold, so that the anti-adhesion pad at the bottom of the square box-shaped core mold can fully contact it and form a protective layer under the concrete, and prevent the square box-shaped core mold from floating up during concrete pouring, and at the same time prevent the square box-shaped core mold from floating left and right, thereby improving the structural strength of the hollow floor slab.
[0023] 2. The present application sets an upper anti-adhesion pad, which can prevent the upper steel mesh of the floor slab from coming into close contact with the square box-shaped core mold, thereby leaving a suitable upper protective layer space for concrete, so that the square box-shaped core mold can be completely wrapped by concrete, thereby improving the molding quality of the hollow floor slab. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 It is a schematic cross-sectional structure diagram of an implementation method of the present application.
[0025] In the figure: 1. Square box core mold; 2. Rib beam; 3. Upper steel mesh of floor slab; 4. Steel mesh of floor bottom slab; 5. Lower formwork; 6. Anti-adhesion pad; 7. Self-tapping screws. DETAILED DESCRIPTION
[0026] The embodiment of the present application discloses a method for positioning and anti-floating construction of a self-supporting square box-shaped core mold for a cast-in-place concrete hollow floor. By tapping the self-tapping screws 7 at the bottom of the square box-shaped core mold 1, a downward pulling force can be provided for the square box-shaped core mold 1, and the square box-shaped core mold 1 can be fixed, so that the anti-adhesion pad 6 at the bottom of the square box-shaped core mold 1 can fully contact it and form a protective layer under the concrete, and prevent the square box-shaped core mold 1 from floating up during concrete pouring, and at the same time prevent the square box-shaped core mold 1 from floating left and right, thereby improving the structural strength of the hollow floor.
[0027] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0028] Reference Figure 1 The self-supporting square box-shaped core mold positioning and anti-floating construction method for cast-in-place concrete hollow floor disclosed in the embodiment of the present application includes the following construction steps:
[0029] S1. Install the lower template 5.
[0030] According to the requirements of the construction drawings, first install the bottom formwork of the floor slab, use the bracket and formwork fixing system to ensure that the levelness and strength of the formwork meet the design requirements, and erect the support frame according to the support system construction plan, with the arch height being 3% of the span.
[0031] Use a total station or theodolite to perform precise measurements, lay out the floor slab edge lines and key structure position lines, and mark the positioning lines for beams, columns, and steel bar arrangements on the surface of the lower template 5.
[0032] S2, tie the rib beam 2 and the floor bottom plate steel mesh 4, and form a cavity in the rib beam 2, the cavity is used to place the square box-shaped core mold 1, and the lower layer template 5 is located at the bottom of the floor bottom plate steel mesh 4.
[0033] The rib beams 2 are bundled into shape and installed and fixed according to the marked positions. A cavity is formed at the position surrounded by the rib beams 2. The square box-shaped core molds 1 can be placed inside the cavity, and the cavities are independent, so that the square box-shaped core molds 1 will not touch each other and maintain a certain distance, so that the concrete can be fully filled between the square box-shaped core molds 1, thereby improving the strength of the hollow floor slab and at the same time limiting the left and right positions of the square box-shaped core molds 1, thereby achieving an anti-floating effect. It should be noted that there is a gap between the square box-shaped core mold 1 and the rib beams 2, which is used for concrete to be filled in, so that the concrete distribution is more even.
[0034] S3. Tie the upper steel mesh 3 of the floor slab above the square box-shaped core mold 1, and arrange a plurality of anti-adhesion pads 6 at the top and bottom of the square box-shaped core mold 1, the anti-adhesion pads 6 are used to maintain the distance between the upper steel mesh 3 of the floor slab and the steel mesh 4 of the floor bottom plate and the square box-shaped core mold 1. In step 3, at least four anti-adhesion pads 6 are arranged, and are evenly distributed at the top and bottom of the square box-shaped core mold 1. The anti-adhesion pads 6 are tied and fixed to the upper steel mesh 3 of the floor slab and the steel mesh 4 of the floor bottom plate by iron wire. In step S3, through the arrangement of the anti-adhesion pads 6, a concrete upper protective layer is formed between the upper steel mesh 3 of the floor slab and the top of the square box-shaped core mold 1, and a concrete lower protective layer is formed between the upper steel mesh 3 of the floor slab and the bottom of the square box-shaped core mold 1.
[0035] A plurality of anti-adhesion pads 6 are arranged at the top and bottom of the square box-shaped core mold 1, and the upper anti-adhesion pads 6 are tied and fixed to the upper steel mesh 3 of the floor slab using 14# iron wire, so that the upper steel mesh 3 of the floor slab can be lifted up, so that a cushion layer is formed between the upper steel mesh 3 of the floor slab and the top of the square box-shaped core mold 1, and the cushion layer is used for the entry of concrete to form a protective layer on the concrete, and prevents the upper steel mesh 3 of the floor slab from being in close contact with the square box-shaped core mold 1 under the pressure of concrete and the trampling of workers, thereby improving the structural strength of the hollow floor slab.
[0036] The anti-adhesion pad 6 below is still tied to the top of the floor bottom slab steel mesh 4 with 14# iron wire, and the square box-shaped core mold 1 is placed after the anti-adhesion pad 6 below is fixed. At this time, a concrete lower protective layer is formed between the square box-shaped core mold 1 and the floor bottom slab steel mesh 4, which facilitates the poured concrete to diffuse and flow around.
[0037] It should be noted that the upper steel mesh 3 of the floor slab is arranged on the top of the rib beam 2 and is fixed by iron wire, while the steel mesh 4 of the floor bottom slab is located at the bottom of the rib beam 2 and is also fixed by iron wire.
[0038] The provision of the rib beam 2 can significantly improve the overall rigidity of the structure, making it more resistant to deformation under the action of external forces, which enables the hollow floor to withstand greater loads and improves the overall strength of the structure.
[0039] S4, the square box-shaped core mold 1 is divided into two parts, the upper and lower parts, and multiple self-tapping screws 7 are used to pass through the lower template 5 and fix it to the square box-shaped core mold 1. The square box-shaped core molds 1 are fixed by bolts. Before performing step S4, first locate the tapping position of the self-tapping screws 7 and mark it.
[0040] After the square box-shaped core mold 1 is placed in place, at least four self-tapping screws 7 are used, and the self-tapping screws are penetrated downward from the top of the square box-shaped core mold 1, so that the self-tapping screws are set according to the position shown in the figure, so that the square box-shaped core mold 1 can be fixed in the current position, and the tapping position of the self-tapping screws 7 is measured and marked in advance at the bottom of the lower template 5, so that the self-tapping screws 7 can provide a downward pulling force for the square box-shaped core mold 1, further enabling the square box-shaped core mold 1 to obtain anti-floating ability, thereby enhancing the structural strength of the hollow floor slab.
[0041] S5, pouring concrete. In S5, while pouring the concrete, the concrete is vibrated by a vibrating rod.
[0042] When pouring concrete, the method of pouring and vibrating is adopted. The concrete pouring is carried out in two times. The first pouring can be stopped when it reaches half the thickness of the square box core mold 1. A vibrating rod with a diameter of 3cm is used. The vibrating rod is vertically inserted into the concrete during vibration. The insertion spacing of the vibrating rod should be strictly controlled at 300mm to ensure that all ribs can be fully vibrated to avoid the occurrence of vibration leakage. Vibration effectively removes the air under the core mold and ensures the vibration density of the concrete under the core mold, thereby preventing subsequent quality problems such as honeycombs, pockmarks and even holes.
[0043] After the current concrete layer has initially solidified, a second pouring can be carried out until the designed elevation is reached. At this time, the rib concrete needs to be vibrated a second time to further improve the density and uniformity of the concrete.
[0044] S6. After the concrete solidifies, the lower template 5 is removed. In step S6, after the lower template 5 is removed, a grinding machine is used to cut and grind the leaked self-tapping screws 7.
[0045] The lower template 5 can be removed only after the concrete is completely solidified. After removal, the self-tapping screws 7 will leak out excess parts. At this time, a grinder is used to cut and grind the excess parts to improve the flatness of the bottom of the hollow floor.
[0046] Working principle: install the lower template 5 at the designed position, and construct the rib beam 2, the upper steel mesh 3 of the floor slab and the steel mesh 4 of the floor bottom slab. Before installing the upper steel mesh 3 of the floor slab, fix the anti-adhesion pad 6 below to the top of the steel mesh 4 of the floor bottom slab by wire, then put in the square box-shaped core mold 1, and place the anti-adhesion pad 6 on the top of the square box-shaped core mold 1, and fix the anti-adhesion pad 6 to the bottom of the upper steel mesh 3 of the floor slab by wire, so that there is a certain space between the upper steel mesh 3 of the floor slab and the steel mesh 4 of the floor bottom slab and the square box-shaped core mold 1, which is convenient for the flow of concrete, and then fix the square box-shaped core mold 1 at the placement position by self-tapping screws 7, and through cooperation with the anti-adhesion pad 6, the square box-shaped core mold 1 has anti-floating ability;
[0047] Among them, the self-tapping screws can provide a downward pulling force for the square box-shaped core mold, and can achieve a fixing effect on the square box-shaped core mold, so that the anti-adhesion pad at the bottom of the square box-shaped core mold can fully contact it and form a protective layer under the concrete, and prevent the square box-shaped core mold from floating up during concrete pouring, and at the same time prevent the square box-shaped core mold from floating left and right, thereby improving the structural strength of the hollow floor slab;
[0048] The setting of the upper anti-adhesion pad can prevent the upper steel mesh of the floor slab from being in close contact with the square box-shaped core mold, thereby leaving a suitable upper protective layer of concrete, so that the square box-shaped core mold can be completely wrapped by concrete, improving the molding quality of the hollow floor slab;
[0049] The pouring of concrete is carried out in two times to improve the density of concrete. After the concrete solidifies, the lower template 5 is removed, and the redundant self-tapping screws 7 are ground with a grinder to improve the flatness of the bottom of the hollow floor.
[0050] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.
[0051] What has been described above is only a preferred specific implementation manner of the embodiments of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes according to the technical scheme and concept of the present application within the technical scope disclosed in the present application, which should be covered by the protection scope of the present application.
Claims
1. A self-supporting square box-shaped core mold positioning and anti-floating construction method for cast-in-place concrete hollow floor, characterized by: The construction steps include: S1, installing the lower template (5); S2, tying the rib beam (2) and the floor bottom plate steel mesh (4), and forming a cavity in the rib beam (2), wherein the cavity is used to place the square box-shaped core mold (1), and the lower layer template (5) is located at the bottom of the floor bottom plate steel mesh (4); S3, tying the upper steel mesh (3) of the floor slab above the square box-shaped core mold (1), and arranging a plurality of anti-adhesion pads (6) at the top and bottom of the square box-shaped core mold (1), wherein the anti-adhesion pads (6) are used to maintain the distance between the upper steel mesh (3) of the floor slab and the steel mesh (4) of the floor bottom slab and the square box-shaped core mold (1); S4, the square box-shaped core mold (1) is divided into an upper and lower part, and a plurality of self-tapping screws (7) are used to pass through the lower template (5) and fix it to the square box-shaped core mold (1), and the square box-shaped core molds (1) are fixed by bolts; S5, pouring concrete; S6. After the concrete solidifies, remove the lower formwork (5).
2. The self-supporting square box-shaped core mold positioning and anti-floating construction method for cast-in-place concrete hollow floor as claimed in claim 1 is characterized in that: In the step 2, the square box-shaped core mold (1) has an independent cavity, and the square box-shaped core mold (1) does not contact the rib beam (2).
3. The self-supporting square box-shaped core mold positioning and anti-floating construction method for cast-in-place concrete hollow floor as claimed in claim 1 is characterized in that: In step 3, at least four anti-adhesion pads (6) are provided and are evenly distributed at the top and bottom ends of the square box-shaped core mold (1), and the anti-adhesion pads (6) are tied and fixed to the upper steel mesh of the floor slab (3) and the steel mesh of the floor bottom slab (4) by iron wire.
4. The self-supporting square box-shaped core mold positioning and anti-floating construction method for cast-in-place concrete hollow floor as claimed in claim 1, characterized in that: In step S3, by setting the anti-adhesion pad (6), a concrete upper protective layer is formed between the upper steel mesh (3) of the floor slab and the top of the square box-shaped core mold (1), and a concrete lower protective layer is formed between the upper steel mesh (3) of the floor slab and the bottom of the square box-shaped core mold (1).
5. The self-supporting square box-shaped core mold positioning and anti-floating construction method for cast-in-place concrete hollow floor as claimed in claim 1, characterized in that: In the step S4, a plurality of the self-tapping screws (7) are provided, and the self-tapping screws (7) are provided in the middle of the outer side of the square box-shaped core mold (1).
6. The self-supporting square box-shaped core mold positioning and anti-floating construction method for cast-in-place concrete hollow floor as claimed in claim 1, characterized in that: Before performing step S4, the tapping position of the self-tapping screw (7) is first located and marked.
7. The self-supporting square box-shaped core mold positioning and anti-floating construction method for cast-in-place concrete hollow floor as claimed in claim 1, characterized in that: In S5, while pouring the concrete, the concrete is vibrated by a vibrating rod.
8. The self-supporting square box-shaped core mold positioning and anti-floating construction method for cast-in-place concrete hollow floor as claimed in claim 1, characterized in that: In the step S6, after removing the lower template (5), a grinding machine is used to cut and grind the leaked self-tapping screws (7).