A formwork-free construction structure for pre-drilled anchor bolt holes in concrete equipment foundations.

Abstract

This utility model relates to the field of power plant concrete equipment foundation construction technology, specifically to a formwork-free construction structure for pre-reserved anchor bolt holes in concrete equipment foundations. It includes: an outer formwork for a reinforcing cage and an inner formwork for a wire mesh. The outer formwork for the reinforcing cage has a cylindrical inner cavity with openings at both ends. The inner formwork for the wire mesh is located inside the cylindrical inner cavity and is fixedly connected to the inner wall of the outer formwork for the reinforcing cage. The cylindrical inner cavity of the outer formwork for the reinforcing cage and the inner formwork for the wire mesh together enclose and form the pre-reserved hole. The mesh size of the inner formwork for the wire mesh is smaller than the maximum particle size of the concrete. During pouring, the concrete is poured into the pre-reserved hole enclosed by the inner formwork for the wire mesh, achieving formwork-free construction. This effectively prevents deformation and displacement of the concrete during pouring, reduces difficulties in demolding and damage to the hole wall, improves construction efficiency and quality, reduces construction waste, and provides significant environmental benefits.

Description

Technical Field

[0001] This utility model relates to the field of power plant concrete equipment foundation construction technology, specifically to a formwork-free concrete equipment foundation pre-reserved anchor bolt hole construction structure. Background Technology

[0002] With the rapid development of my country's national economy, the installation of various large-scale new industrial equipment and large steel structure workshops is constantly increasing. Various foundations (especially equipment foundations) can be constructed using two methods: pre-drilled anchor bolts and pre-drilled anchor bolt holes. Foundation pre-embedded bolts come in many specifications and quantities, requiring high construction precision. They bear the entire weight of the equipment and its dynamic and accidental loads during operation, playing a crucial role in the equipment's lifespan and operational safety. Significant deviations in the pre-embedded anchor bolts will directly affect the normal installation and commissioning of various equipment. Furthermore, the treatment of substandard foundations is extremely difficult. Therefore, for large equipment foundations, the construction method of pre-drilling anchor bolt holes is mostly adopted. After the equipment is in place, the anchor bolts are installed, followed by secondary concrete pouring.

[0003] When constructing pre-drilled anchor bolt holes, an inner mold needs to be made for the holes. Since the pre-drilled holes are generally long and narrow, wooden or metal molds are commonly used. After the concrete is poured, the molds are difficult to remove due to the clamping and friction of the foundation concrete on the inner molds. Furthermore, there are issues such as incomplete removal and damage to the hole wall concrete, which directly affect the quality of the anchor bolt grouting. In addition, the hole wall needs to be roughened before secondary grouting, making the construction difficult, inefficient, and costly. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of the existing technology by providing a construction structure for pre-reserved anchor bolt holes in concrete equipment foundations that does not require formwork, so as to achieve clean demolding and no burrs on the hole walls.

[0005] To achieve the above objectives, this utility model provides the following technical solution: This utility model provides a formwork-free construction structure for pre-reserved anchor bolt holes in concrete equipment foundations, including: an outer formwork for a steel cage and an inner formwork for wire mesh. The outer formwork of the reinforcing cage has a cylindrical inner cavity with openings at both ends. The inner formwork of the wire mesh is located inside the cylindrical inner cavity and is fixedly connected to the inner wall of the outer formwork of the reinforcing cage. The cylindrical inner cavity of the outer formwork of the reinforcing cage and the inner formwork of the wire mesh together form a reserved hole, wherein the mesh aperture of the inner formwork of the wire mesh is smaller than the maximum particle size of the concrete particles.

[0006] In some embodiments, the reinforcement assembly is further provided on the outer formwork of the reinforcing cage. The reinforcing assembly includes vertical reinforcing bars and horizontal reinforcing bars. For reserved holes with a cross-sectional side length greater than 100 mm, the outer formwork of the reinforcing cage is provided with the vertical reinforcing bars. For reserved holes with a depth greater than 500 mm, the outer formwork of the reinforcing cage is provided with the horizontal reinforcing bars.

[0007] In some embodiments, the reinforcing rib assembly is disposed at at least one of the lower opening, middle opening, and upper opening of the outer formwork of the reinforcing cage.

[0008] In some embodiments, the cross-sectional dimensions of the outer formwork of the reinforcing cage are larger than the design dimensions of the reserved holes.

[0009] In some embodiments, the cross-sectional dimensions of the outer formwork of the reinforcing cage are 10-20 mm larger than the design dimensions of the reserved holes.

[0010] In some embodiments, the bottom of the inner wire mesh mold is folded in half and fixedly connected to the outer mold of the reinforcing cage to close the bottom of the reserved hole.

[0011] In some embodiments, the inner wire mesh has a mesh size of 13.

[0012] In some embodiments, the inner mold of the wire mesh is No. 8 galvanized iron wire.

[0013] Furthermore, the beneficial effects of this utility model are as follows: This utility model adds a casting structure formed by the combination of a steel cage outer formwork and a wire mesh inner formwork. During casting, the concrete is poured into the reserved hole enclosed by the wire mesh inner formwork, realizing formwork-free construction, effectively preventing deformation and displacement of the concrete during the casting process, reducing difficulties in demolding and damage to the hole wall, while improving construction efficiency and quality, reducing construction waste, and achieving outstanding environmental benefits.

[0014] In addition, this utility model is also equipped with a reinforcing rib assembly, specifically with vertical and horizontal reinforcing bars, which achieves enhanced support for large cross-sections and deep holes, thereby improving structural strength and stability. Attached Figure Description

[0015] Figure 1 A schematic diagram of the overall structure of the formwork-free concrete equipment foundation with reserved anchor bolt holes provided by this utility model. Figure 2 A top view of the overall structure of the pre-reserved anchor bolt hole construction structure for the formwork-free concrete equipment foundation provided by this utility model.

[0016] In the diagram: 1-Outer formwork of the reinforcing cage, 2-Inner formwork of the wire mesh, 3-Horizontal reinforcing bars, 4-Vertical reinforcing bars, 5-Pre-reserved holes. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model. In the description of the embodiments of the present utility model, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in the text is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. In addition, in the description of the embodiments of the present utility model, "multiple" means two or more. Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of this utility model, unless otherwise stated, "multiple" means two or more.

[0018] First of all, it should be noted that the reserved hole 5 mentioned below is the anchor bolt hole reserved for the equipment, and the outer formwork 1 of the steel cage is the steel cage commonly used in the construction process. This application will not elaborate on this in detail.

[0019] like Figure 1 - Figure 2 As shown, this utility model provides a construction structure for pre-reserved anchor bolt holes in concrete equipment foundations without formwork support, including: an outer formwork 1 for a steel cage and an inner formwork 2 for a wire mesh. The outer formwork 1 of the reinforcing cage has a cylindrical inner cavity with openings at both ends. The inner formwork 2 of the wire mesh is placed inside the cylindrical inner cavity and is fixedly connected to the inner wall of the outer formwork 1. The cylindrical inner cavity of the outer formwork 1 and the inner formwork 2 of the wire mesh together form a reserved hole 5. The mesh size of the inner formwork 2 of the wire mesh is smaller than the maximum particle size of the concrete. It also includes a reinforcing rib assembly, which is placed in the outer formwork 1 of the reinforcing cage. The reinforcing rib assembly includes vertical reinforcing bars 4 and horizontal reinforcing bars 3. For reserved holes 5 with a cross-sectional side length greater than 100 mm, the outer formwork 1 of the reinforcing cage is provided with vertical reinforcing bars 4. For reserved holes 5 with a depth greater than 500 mm, the outer formwork 1 of the reinforcing cage is provided with horizontal reinforcing bars 3. The combined structure of the outer formwork 1 of the reinforcing cage and the inner formwork 2 of the wire mesh enables formwork-free construction, effectively prevents deformation and displacement during concrete pouring, and reduces difficulties in demolding and damage to the hole wall.

[0020] In one possible implementation, the reinforcing rib assembly is set at least at one of the lower, middle and upper openings of the outer formwork 1 of the steel cage. By setting the reinforcing rib assembly at least at one of the lower, middle and upper openings, multi-position fixing is achieved, and the verticality and positional accuracy are optimized with a deviation of less than 5 mm.

[0021] In one possible implementation, the cross-sectional dimension of the outer formwork 1 of the reinforcing cage is larger than the design dimension of the reserved hole 5. In the above structure, increasing the cross-sectional dimension of the outer formwork 1 of the reinforcing cage to be larger than the design dimension of the reserved hole 5 expands the tolerance space, facilitates installation and adjustment, and reduces installation errors.

[0022] In one possible implementation, the cross-sectional dimensions of the outer formwork 1 of the reinforcing cage are 10-20 mm larger than the design dimensions of the reserved hole 5. In the above design, a certain error value is set between the outer formwork 1 of the reinforcing cage and the reserved hole 5 in this application, so as to ensure that the design dimensions of the reserved hole 5 can be accurately controlled after the casting is completed, and to ensure that the shape of the reserved hole 5 is consistent.

[0023] In one possible implementation, the bottom of the inner wire mesh mold 2 is folded in half and fixedly connected to the outer mold 1 of the reinforcing cage to seal the bottom of the reserved hole 5, preventing concrete from entering the reserved hole 5 and reducing cleaning work.

[0024] In one possible implementation, the inner wire mesh mold 2 has a mesh size of 13, which makes the mesh aperture smaller than the maximum particle size of concrete particles, preventing concrete leakage while forming a rough surface and eliminating the need for roughening. However, it is worth noting that the mesh size of the inner wire mesh mold 2 can be changed according to actual needs, and this application does not make a specific limitation on this.

[0025] In one possible implementation, the inner mold 2 of the wire mesh is made of No. 8 galvanized iron wire, which achieves corrosion resistance and high-strength fixation, extends service life, and reduces maintenance costs.

[0026] The present invention will be further explained and illustrated below in conjunction with the actual working process.

[0027] First, based on the size and depth of the anchor bolt holes, the construction workers select the diameter of the reinforcing bars by calculating the lateral pressure during the concrete pouring process inside the anchor bolt holes.

[0028] Secondly, the construction workers used on-site steel bar processing materials, with the cutting size being 10-20 mm larger than the anchor bolt hole size, and used mechanical cutting to complete the cutting of the outer formwork 1 of the steel cage.

[0029] Secondly, welding of the outer formwork 1 of the reinforcing cage: The outer formwork 1 of the reinforcing cage uses E55 welding rods and manual arc welding. All welds are fillet welds to ensure that the welds are full and free from slag inclusions, flow welds, missed welds, and bite damage to the main reinforcement bars. In addition, when welding the outer formwork 1 of the reinforcing cage, for anchor bolt holes with a cross-sectional side length greater than 100 mm, one or more vertical reinforcing bars 4 are added vertically, and for anchor bolt holes with a depth greater than 500 mm, one or more horizontal reinforcing bars 3 are added horizontally to enhance the strength of the outer formwork 1 of the reinforcing cage.

[0030] Next, the inner mold 2 of the wire mesh is cut to a length equal to the hole depth plus the side length of the hole. The specific process is as follows: the wire mesh is wrapped around the perimeter of the steel cage. After wrapping it twice, the bottom wire mesh is folded in half to form the bottom of the steel cage. The material of the inner mold 2 of the wire mesh can be No. 8 galvanized iron wire. The inner mold 2 of the wire mesh is kept straight during the wrapping process and both ends are firmly fixed to the steel bars of the steel cage.

[0031] Subsequently, the installation of the reinforcing cage was basically synchronized with the binding of the foundation reinforcing bars. Before installation, the cage was positioned according to the design dimensions of the anchor bolt pre-drilled holes 5. Vertical reinforcing bars 4 and horizontal reinforcing bars 3 were added at the bottom, middle and top of the cage, respectively. The vertical reinforcing bars 4 and horizontal reinforcing bars 3 were firmly bound to the foundation reinforcing bars. The reinforcing cage was then spot-welded to the vertical reinforcing bars 4 and horizontal reinforcing bars 3, and the position of the reinforcing cage was kept consistent with the design drawings. The verticality deviation of the reinforcing cage was less than 5 mm.

[0032] Following this, the steel reinforcement cage is inspected: the upper and lower openings of the steel reinforcement cage should be accurately positioned and firmly fixed. Specifically, the installation of the steel reinforcement cage is checked by observation and manual shaking. The center displacement should not exceed 3 mm, the depth deviation should be between 0 and 10 mm, and the verticality deviation should not exceed 5 mm by using a string line and ruler. The joints of the inner formwork 2 of the wire mesh should be checked for fixation, loosening, protrusion, or other problems. After confirming that there are no problems, concrete pouring can proceed. Before pouring concrete, the upper opening of the steel reinforcement cage should be covered with wooden formwork or iron plates to seal the reserved hole 5 and prevent concrete from entering. During the concrete vibration process, the vibrator should be kept at a distance of more than 100 mm from the steel reinforcement cage to prevent the inner formwork 2 of the wire mesh from disturbing the reserved hole 5 and causing deformation. After the concrete is poured, the inside of the steel reinforcement cage should be inspected, and any problems such as deformation or leakage should be dealt with promptly.

[0033] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A no-allowance-for-embedment concrete equipment foundation footing bolt hole construction structure, characterized in that, include: The outer formwork of the reinforcing cage and the inner formwork of the wire mesh; The outer formwork of the reinforcing cage has a cylindrical inner cavity with openings at both ends. The inner formwork of the wire mesh is located inside the cylindrical inner cavity and is fixedly connected to the inner wall of the outer formwork of the reinforcing cage. The cylindrical inner cavity of the outer formwork of the reinforcing cage and the inner formwork of the wire mesh together form a reserved hole, wherein the mesh aperture of the inner formwork of the wire mesh is smaller than the maximum particle size of the concrete particles.

2. The formwork-free concrete equipment foundation pre-reserved anchor bolt hole construction structure as described in claim 1, characterized in that, It also includes a reinforcing rib assembly, which is disposed on the outer formwork of the reinforcing cage. The reinforcing rib assembly includes vertical reinforcing bars and horizontal reinforcing bars. For reserved holes with a cross-sectional side length greater than 100 mm, the outer formwork of the reinforcing cage is provided with the vertical reinforcing bars. For reserved holes with a depth greater than 500 mm, the outer formwork of the reinforcing cage is provided with the horizontal reinforcing bars.

3. The formwork-free concrete equipment foundation pre-reserved anchor bolt hole construction structure as described in claim 2, characterized in that, The reinforcing rib assembly is disposed at least at one of the lower, middle and upper openings of the outer formwork of the reinforcing cage.

4. The formwork-free concrete equipment foundation pre-reserved anchor bolt hole construction structure as described in claim 1, characterized in that, The cross-sectional dimensions of the outer formwork of the reinforcing cage are larger than the design dimensions of the reserved holes.

5. The formwork-free concrete equipment foundation pre-reserved anchor bolt hole construction structure as described in claim 4, characterized in that, The cross-sectional dimensions of the outer formwork of the reinforcing cage are 10-20 mm larger than the design dimensions of the reserved holes.

6. The formwork-free concrete equipment foundation pre-reserved anchor bolt hole construction structure as described in claim 1, characterized in that, The bottom of the inner wire mesh mold is folded in half and fixedly connected to the outer mold of the reinforcing cage to seal the bottom of the reserved hole.

7. The formwork-free concrete equipment foundation pre-reserved anchor bolt hole construction structure as described in claim 1, characterized in that, The inner mesh of the wire mesh is 13 mesh.

8. The formwork-free concrete equipment foundation pre-reserved anchor bolt hole construction structure as described in claim 1, characterized in that, The inner mold of the wire mesh is made of No. 8 galvanized iron wire.

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