A positioning net laying process for steel reinforcement framework construction

Abstract

The application discloses a positioning net paving process for steel reinforcement framework construction and relates to the technical field of prefabricated box girder steel reinforcement framework paving, which comprises the following steps: marking installation positions on a mould bed; discharging and processing positioning net pieces; laying and binding the positioning net pieces; penetrating and fixing rubber rods; and detecting and accepting quality; the process has the beneficial effects that: the positioning net pieces are hoisted in a group by using special lifting hangers in a flow production mode, which replaces manual carrying one by one, reduces labor intensity, and improves hoisting efficiency; the positioning net pieces are sequentially pushed out one by one by the special lifting hanger structure and the gantry crane, which is convenient for workers to take and hold.

Description

Technical Field

[0001] This invention relates to the field of precast box girder steel reinforcement cage installation technology, and in particular to a positioning mesh installation process for steel reinforcement cage construction. Background Technology

[0002] Traditional prestressed concrete construction methods use corrugated pipes as prestressing ducts, applying prestress through concrete pouring and tensioning of prestressing tendons. However, traditional corrugated pipes are prone to deformation and displacement, leading to inaccurate positioning of the prestressing tendons and affecting the structure's load-bearing capacity and durability. Furthermore, prestressed ducts require considerable attention during use. With advancements in materials and processes, new materials and construction methods have gradually replaced traditional prestressed ducts, resulting in the emergence of pull-out pipes (rubber rods). However, fixing pull-out pipes during installation is more complicated, and ensuring that parameters such as the pipe's direction, bending radius, and height meet design requirements is challenging. During concrete pouring and curing, the pipes may shift due to various factors. Summary of the Invention

[0003] The purpose of this invention is to provide a positioning mesh laying process for constructing steel reinforcement cages in order to solve the above-mentioned problems.

[0004] The present invention achieves the above objectives through the following technical solutions: A method for laying positioning mesh for reinforcing steel frame construction includes the following steps: Step S1: Mark the installation positions on the jig. Based on the dimensions of the precast box girder and the design requirements of the prestressed steel bars, mark the installation positions of each positioning mesh on the jig and the already laid steel bars. Step S2: Processing and unloading of positioning mesh. When processing positioning mesh, ensure that it has sufficient strength and rigidity to withstand various loads during construction. After processing, the positioning mesh is hung on a special lifting device. After the bottom layer of steel bars at the bottom and sides of the precast box girder is laid and tied, the positioning mesh is hoisted by a gantry crane to begin installation. Step S3: Laying and binding of positioning mesh. The gantry crane uses special lifting tools to transport the group of positioning mesh to the assembly frame position. Using special lifting tools in conjunction with the gantry crane, the positioning mesh is placed on the bottom steel bars according to the marked positions, and binding wire is used to firmly connect it to the bottom and side steel bars. Step S4: Insertion and fixing of rubber rods. After the positioning mesh is installed, use a special rod inserter or manual operation to insert the rubber rods through the corresponding reserved positions of the positioning mesh in sequence. Then use a special clamp or bracket to fix the rubber rods (11) on the positioning mesh to ensure that they will not fall off or shift. Step S5: Quality inspection and acceptance. After the prestressed pipe positioning net installation process is completed, quality inspection and acceptance are required. Check whether the rubber rods are inserted smoothly and whether the positioning net is installed firmly and stably. If there are any problems, they should be dealt with and repaired in time to ensure that the design and specification requirements are met. In step S3, the special lifting device includes a frame, which includes two fixed rods on the left and right. The front and rear ends of the fixed rods are fixedly connected by connecting rods. The rear ends of the two fixed rods extend downward in an arc shape and are rotatably connected to a hanging beam that can swing left and right. A limit block is fixedly installed on the upper surface of the front end of the hanging beam. A flip-over block is provided on the rear side of the limit block. The flip-over block has a triangular shape with the long side facing down. A hydraulic cylinder for pushing the positioning mesh through the flip-over block is fixedly installed inside the hanging beam. A push block is fixedly installed on the upper end of the hydraulic cylinder. The upper end of the push block is set as an arc surface to prevent the positioning mesh from falling backward during the lifting process of the push block. The hanging beam has a push hole corresponding to the position of the push block. Lifting lugs are fixedly installed on the upper surfaces of the front and rear ends of the fixed rods. The gantry crane slings are lifted by fixing the lifting lugs at four points. The number of special lifting tools is several. When the positioning mesh is being processed, the frame of the unloaded special lifting tool is placed on the external horizontal frame plate, and the positioning mesh can be hung on the hanging beam for storage. When in use, the gantry crane slings are connected to the lifting lugs for lifting. During lifting, another unloaded special lifting tool can be placed on the external horizontal frame plate for receiving materials and continuous paving.

[0005] Preferably, the specifications and dimensions of the positioning mesh processed in step S2 are determined according to the center position of the prestressed steel bars in the installation position of the positioning mesh in the precast box girder. The positioning mesh in the entire precast box girder is divided into two symmetrical groups for processing and installation.

[0006] Preferably, in step S3, during the installation process, the position and angle of the positioning mesh need to be checked at any time, and if necessary, adjustments should be made in a timely manner to ensure that it meets the design requirements.

[0007] Compared with the prior art, the beneficial effects of the present invention are as follows: Installing positioning mesh effectively restrains the movement of rubber rods, ensuring their stable position and improving the strength and durability of the pipeline. Rubber rods are typically made of high-strength, highly elastic materials, which enhance pipeline strength and durability, reducing deformation and damage. Using positioning mesh simplifies construction operations, improving efficiency and quality. It allows for quick and accurate installation and adjustment of rubber rod positions, reducing manual labor and errors. This process uses specialized lifting equipment to lift the positioning mesh panels in groups in a streamlined operation, replacing manual handling of each panel, reducing labor intensity and improving lifting efficiency; By using a special lifting device structure and coordinating with the movement of the gantry crane, positioning mesh panels are pushed out one by one for easy access by workers. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 This is a flowchart of the positioning net laying process for the construction of a steel reinforcement cage according to the present invention.

[0010] Figure 2 This is a schematic diagram of the internal structure of a special lifting tool for a positioning net laying process for a steel reinforcement frame construction as described in this invention.

[0011] Figure 3 This is an enlarged view of point A in the positioning net laying process for the construction of a steel reinforcement cage described in this invention.

[0012] Figure 4 This is a left view of a special lifting tool for a positioning net laying process for a steel reinforcement frame construction as described in this invention.

[0013] Figure 5 This is a bottom view of a special lifting tool for a positioning net laying process for a steel reinforcement frame construction as described in this invention.

[0014] Figure 6 This is a schematic diagram of the positioning mesh sheet in the positioning mesh paving process for a steel reinforcement frame construction as described in this invention.

[0015] The annotations in the attached figures are explained as follows: 1. Gantry crane slings; 2. Lifting lugs; 3. Frame; 4. Hanging beams; 5. Limiting blocks; 6. Positioning mesh; 7. Overturning blocks; 8. Hydraulic cylinders; 9. Push blocks; 10. Push holes; 11. Rubber rods. Detailed Implementation

[0016] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, 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 this invention. In addition, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a few" means two or more.

[0017] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection", and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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 connection of two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood through the specific circumstances.

[0018] The present invention will be further described below with reference to the accompanying drawings: like Figures 1-6 As shown, a positioning mesh installation process for reinforced concrete frame construction includes the following steps: Step S1: Mark the installation positions on the jig. Based on the dimensions of the precast box girder and the design requirements of the prestressed steel bars, mark the installation positions of each positioning mesh 6 on the jig and the already laid steel bars. In this embodiment, the already laid steel bars refer to the bottom layer steel bars at the bottom and sides of the precast box girder.

[0019] Step S2: Processing and unloading of positioning mesh 6. When processing positioning mesh 6, the specifications and dimensions of the processed positioning mesh 6 are determined according to the center position of the prestressed steel bars in the installation position of the positioning mesh 6 in the precast box girder. The positioning mesh 6 in the entire precast box girder is divided into two symmetrical groups for processing and laying. Moreover, the positioning mesh 6 should ensure that it has sufficient strength and rigidity to withstand various loads during construction. After the processing is completed, the positioning mesh 6 is hung on a special lifting tool. After the bottom layer of steel bars at the bottom and sides of the precast box girder is laid and tied, the positioning mesh 6 is lifted by a gantry crane to start laying.

[0020] Step S3: Laying and binding of positioning mesh 6. The gantry crane uses special lifting tools to transport the group of positioning mesh 6 to the assembly frame position. With the special lifting tools and the gantry crane moving, the positioning mesh 6 is placed on the bottom steel bars according to the marked positions. It is then connected to the bottom and side steel bars with binding wire. During the installation process, the position and angle of the positioning mesh 6 need to be checked at any time. If necessary, it should be adjusted in time to ensure that it meets the design requirements.

[0021] Step S4: Insertion and fixing of rubber rod 11. After the positioning mesh 6 is installed, use a special rod inserter or manual operation to insert the rubber rod 11 through the corresponding reserved position of the positioning mesh 6 in sequence. Then use a special clamp or bracket to fix the rubber rod 11 on the positioning mesh 6 to ensure that it will not fall off or shift.

[0022] Step S5: Quality Inspection and Acceptance. After completing the prestressed duct positioning net installation process, quality inspection and acceptance are required. Check whether the rubber rod 11 is inserted smoothly, and check whether the positioning net 6 is installed firmly and stably. If there are any problems, handle and repair them in time to ensure that the design and specification requirements are met.

[0023] In step S3, the special lifting device includes a frame 3, which includes two fixed rods, left and right. The front and rear ends of the fixed rods are fixedly connected by connecting rods. The rear ends of the two fixed rods extend downward in an arc and are rotatably connected to a swinging beam 4, which can swing left and right to accommodate the simultaneous hanging of positioning meshes 6 of different specifications. The upper surface of the hanging beam 4 is provided with support ribs to facilitate the automatic sliding of the positioning meshes 6, reducing the contact area and friction. At the same time, the hanging beam 4 is positioned forward and downward to facilitate the sliding of the positioning meshes 6 under the action of gravity. A limit block 5 is fixedly installed on the upper surface of the front end of the hanging beam 4. A turning block 7 is provided on the rear side of the limit block 5. The side shape of the turning block 7 is such that the long side is facing down. The hanging beam 4 is a square triangle. A hydraulic cylinder 8 is fixedly installed inside the hanging beam 4 to push the positioning mesh 6 through the overturning block 7. A push block 9 is fixedly installed on the upper end of the hydraulic cylinder 8. The upper end of the push block 9 is set as an arc surface to prevent the positioning mesh 6 from falling backward during the lifting process of the push block 9. The hanging beam 4 has a push hole 10 corresponding to the position of the push block 9. The hydraulic cylinder 8 extends the push block 9 to push a positioning mesh 6 up along the overturning block 7 to the highest point of the overturning block 7. The positioning mesh 6 slides forward from the overturning block 7 to the limit block 5. The positioning mesh 6 is pushed out one by one, which is convenient for workers to pick up and lay. The upper surfaces of the front and rear ends of the fixed rod are respectively fixed with lifting lugs 2. The gantry crane sling 1 is lifted by fixing the lifting lugs 2 at four points.

[0024] There are two special lifting tools. When the positioning mesh 6 is being processed, the frame 3 of the unloaded special lifting tool is placed on the external horizontal frame plate, and the positioning mesh 6 can be hung on the hanging beam 4 for storage. When in use, the gantry crane sling 1 is connected to the lifting lug 2 for lifting. During lifting, the other unloaded special lifting tool can be placed on the external horizontal frame plate for receiving materials and continuous paving.

[0025] The gantry crane, hydraulic cylinder 8, positioning mesh 6, rubber rod 11 and rod threader are all general standard parts or components known to those skilled in the art. Their structure and principle can be known to those skilled in the art through technical manuals or through conventional experimental methods, so they will not be described in detail here.

[0026] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are only illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from the spirit and scope of the present invention, and all such changes and modifications fall within the scope of the present invention as claimed.

Claims

1. A method for laying positioning mesh for reinforced concrete frame construction, characterized in that: Includes the following steps: Step S1: Mark the installation position on the jig. Based on the size of the precast box girder and the design requirements of the prestressed steel bars, mark the installation positions of each positioning mesh (6) on the jig and the already laid steel bars. Step S2: Processing and unloading of positioning mesh (6). When processing positioning mesh (6), it should be ensured that it has sufficient strength and rigidity to withstand various loads during construction. After processing, positioning mesh (6) is hung on a special lifting device. After the bottom layer of steel bars at the bottom and sides of the precast box girder is laid and tied, positioning mesh (6) is hoisted by a gantry crane to start laying. Step S3: Laying and binding of positioning mesh (6), using a gantry crane to lift special lifting tools to transport the group of positioning mesh (6) to the assembly frame position, and using special lifting tools in conjunction with the gantry crane to move and place the positioning mesh (6) on the bottom steel bars according to the marked positions, and use binding wire to firmly connect it to the bottom and side steel bars; Step S4: Insertion and fixing of rubber rod (11): After the positioning mesh (6) is installed, use a special rod inserter or manual operation to insert the rubber rod (11) through the corresponding reserved position of the positioning mesh (6) in sequence. Then use a special clamp or bracket to fix the rubber rod (11) on the positioning mesh (6) to ensure that it will not fall off or shift. Step S5: Quality inspection and acceptance. After the prestressed pipe positioning net installation process is completed, quality inspection and acceptance are required. Check whether the rubber rod (11) is inserted smoothly and whether the positioning net (6) is installed firmly and stably. If there are any problems, handle and repair them in time to ensure that the design and specification requirements are met. In step S3, the special lifting device includes a frame (3), which includes two fixed rods, left and right. The front and rear ends of the fixed rods are fixedly connected by connecting rods. The rear ends of the two fixed rods extend downward in an arc to a hanging beam (4) that can swing left and right. A limit block (5) is fixedly installed on the upper surface of the front end of the hanging beam (4). A vaulting block (7) is provided on the rear side of the limit block (5). The vaulting block (7) has a triangular shape with the long side facing down. The hanging beam ( 4) An internal hydraulic cylinder (8) is fixedly installed to push the positioning mesh (6) through the overturning block (7). A push block (9) is fixedly installed on the upper end of the hydraulic cylinder (8). The upper end of the push block (9) is set as an arc surface to prevent the positioning mesh (6) from falling backward during the lifting process of the push block (9). The hanging beam (4) is provided with a push hole (10) corresponding to the position of the push block (9). Lifting lugs (2) are fixedly installed on the upper surfaces of the front and rear ends of the fixed rod respectively. The gantry crane sling (1) is lifted by fixing the lifting lugs (2) at four points. The number of special lifting tools is several. When the positioning mesh (6) is being processed, the frame (3) of the unloaded special lifting tool is placed on the external horizontal frame plate, and the positioning mesh (6) can be hung on the hanging beam (4) for storage. When in use, the gantry crane sling (1) is connected to the lifting lug (2) for hoisting. When hoisting, the other unloaded special lifting tool can be placed on the external horizontal frame plate for receiving materials and continuous paving.

2. The method for laying a positioning mesh for constructing a reinforced steel frame according to claim 1, characterized in that: The specifications and dimensions of the positioning mesh (6) processed in step S2 are determined based on the center position of the prestressed steel bars in the installation position of the positioning mesh (6) in the precast box girder. The positioning mesh (6) in the entire precast box girder is divided into two symmetrical groups for processing and installation.

3. The method for laying positioning mesh for reinforcing steel frame construction according to claim 1, characterized in that: In step S3, during the installation process, it is necessary to check the position and angle of the positioning mesh (6) at any time, and make timely adjustments if necessary to ensure that it meets the design requirements.

Images