Construction method for penetrating reinforcing steel bars into laminated slab

Abstract

The invention discloses a construction method for penetrating reinforcing steel bars into a laminated slab, and relates to the technical field of fabricated buildings. In order to improve the efficiency of inserting reinforcing steel bars between truss reinforcing steel bars, the following technical scheme is provided: S1, preparing an auxiliary device which comprises a bullet-shaped front end section and a straight section steel pipe arranged at the tail part of the bullet-shaped front end section, and welding and connecting the bullet-shaped front end section and the straight section steel pipe; s2, at least one directional wheel is installed at the bottom of the straight section steel pipe; s3, a steel bar to be inserted is inserted from the open end of the straight section of the straight section steel pipe and pushed into the bullet-shaped front end section; s4, the auxiliary device is aligned with the gap of the truss steel bars, and the auxiliary device is pushed in the horizontal direction; and S5, after the reinforcing steel bars penetrate through the gaps, the auxiliary devices are pulled out, and penetrating of the reinforcing steel bars is completed. The device is made of waste materials on site, and the effect of utilizing the waste materials is achieved. And meanwhile, construction of steel bar interpenetration and truss steel bars is accelerated, the manual repeated deviation correction process is reduced, and the overall floor slab construction efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of prefabricated building technology, specifically to a construction method for inserting reinforcing bars into composite slabs. Background Technology

[0002] With the acceleration of urbanization and the deepening of environmental awareness, prefabricated buildings, including prefabricated floor slabs, are gradually changing the traditional cast-in-place construction methods and becoming a new trend in the modern construction industry. Prefabricated floor slabs are a floor slab system that uses industrialized production and on-site installation. Prefabricated floor slabs are prefabricated into standard modules in a factory and then transported to the construction site for assembly and installation. This significantly reduces construction time and greatly improves construction efficiency. New prefabricated floor slabs, based on a rational structural design of the supporting components, and through the rational structure of the truss reinforcement itself, as well as the cooperation of the truss reinforcement, the first reinforcing steel reinforcement, and the second reinforcing steel reinforcement, give the floor slab excellent load-bearing capacity, overcoming the problem of poor load-bearing capacity in existing prefabricated floor slabs.

[0003] However, during the construction of new prefabricated floor slabs, the reinforcing bars are interlaced with the upper chord bars of at least two adjacent truss bars, and the reinforcing bars are spaced apart along the extension direction of the lower chord bars. Furthermore, a large number of reinforcing bars are required to repeatedly interlace between the truss bars in both directions, resulting in excessively low efficiency in the construction of the reinforcing bars in the cast-in-place floor slab. Summary of the Invention

[0004] This invention provides a construction method for threading reinforcing bars through composite slabs, with the aim of improving the efficiency of threading reinforcing bars between truss reinforcing bars.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows:

[0006] A construction method for reinforcing steel bars in composite slabs includes the following steps:

[0007] S1. Prepare an auxiliary device, which includes a bullet-shaped front end section and a straight section steel pipe 2, and weld the bullet-shaped front end section and the straight section steel pipe together.

[0008] S2. Install at least one directional wheel at the bottom of the straight section of the steel pipe;

[0009] S3. Insert the reinforcing bar to be inserted from the open end of the straight section of the straight section of the steel pipe and push it into the bullet-shaped front end section.

[0010] S4. Align the auxiliary device with the gap of the truss reinforcement and push the auxiliary device horizontally.

[0011] S5. After the reinforcing bar passes through the gap, the auxiliary device is pulled out to complete the insertion of the reinforcing bar.

[0012] Furthermore, the auxiliary devices were made by cutting and welding scrap steel pipes from the site.

[0013] Furthermore, there are three directional wheels, arranged in a triangle at the bottom of the straight section of the steel pipe.

[0014] Furthermore, the steps include: adjusting the diameter of the straight section of the steel pipe or adjusting the installation height of the directional wheel according to the thickness of the composite plate.

[0015] Furthermore, the truss reinforcement includes an upper chord reinforcement and two lower chord reinforcements whose side walls are respectively connected to the side walls of the upper chord reinforcement. When the insertion direction of the reinforcement to be inserted is perpendicular to the lower chord reinforcement, the curvature and length of the bullet-shaped front end section are adjusted.

[0016] Furthermore, the step of adjusting the curvature of the bullet-shaped front end segment includes heating and bending the bullet-shaped front end segment or replacing it with a front end segment of different curvature.

[0017] The present invention has the following beneficial effects:

[0018] During the construction of prefabricated floor slabs, reinforcing bars are interlaced with the upper chord bars of at least two adjacent truss bars, and are also spaced apart along the extension direction of the lower chord bars. This requires a large number of reinforcing bars to be repeatedly inserted between the truss bars in both directions, resulting in extremely low efficiency in the reinforcement construction of the cast-in-place floor slab. This invention provides a prefabricated floor slab reinforcement insertion method, including corresponding auxiliary devices that can be made from existing waste materials on-site, achieving the effect of reusing existing materials. It also accelerates the construction of reinforcing bar insertion between the reinforcing bars and the truss bars, reduces the need for repeated manual correction, and improves the overall floor slab construction efficiency. Attached Figure Description

[0019] Figure 1 This is a flowchart of the construction method for reinforcing steel bars in composite slabs according to the present invention;

[0020] Figure 2 Schematic diagram of the auxiliary device of the present invention;

[0021] Figure 3 This is a schematic diagram of the auxiliary device of the present invention in the case of inserting longitudinal steel bars;

[0022] Figure 4 This is a schematic diagram of the auxiliary device of the present invention inserting transverse reinforcing bars.

[0023] Figures 1 to 4 The reference numerals in the attached figures are respectively: 1-bullet-shaped front end section; 2-straight steel pipe section; 3-open end of straight section; 4-directional wheel; 5-truss reinforcement; 51-upper chord reinforcement; 52-lower chord reinforcement; 53-web reinforcement. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0025] Please refer to Figure 1-4 This embodiment describes in detail a construction method for reinforcing steel bars in composite slabs, including the following steps:

[0026] S1. Prepare an auxiliary device, which includes a bullet-shaped front end section 1 and a straight section steel pipe 2, and weld the bullet-shaped front end section 1 and the straight section steel pipe 2 together.

[0027] S2. Install at least one directional wheel 4 at the bottom of the straight section of the steel pipe 2;

[0028] S3. Insert the reinforcing bar to be inserted from the straight section opening end 3 of the straight section of the steel pipe 2 and push it into the bullet-shaped front end section 1.

[0029] S4. Align the auxiliary device with the gap of the truss reinforcement 5 and push the auxiliary device in the horizontal direction;

[0030] S5. After the reinforcing bar passes through the gap, the auxiliary device is pulled out to complete the insertion of the reinforcing bar.

[0031] First, the auxiliary device is prepared. This auxiliary device is the core tool for implementing this method, and its structure mainly includes a bullet-shaped front end section 1 and a straight steel pipe section 2 at its rear. The bullet-shaped front end section 1 is cut at one end and processed into a conical or hemispherical bullet shape using a cutting device to facilitate smooth insertion and passage through the narrow gaps between the truss reinforcement bars 5 during subsequent insertion. The length of the straight steel pipe section 2 can be determined according to the common insertion distance in construction, usually 1 to 2 meters, to facilitate handling and pushing by the operator. The processed bullet-shaped front end section 1 is butt-jointed with the straight steel pipe section 2 and firmly connected by welding. The welding method can be continuous circumferential welding to ensure the strength and straightness of the connection and prevent deformation or detachment during pushing. After welding, the weld joint should be ground to remove burrs and ensure the smooth inner wall of the steel pipe so that the reinforcement bars can pass smoothly.

[0032] Next, install the directional wheels 4. Install at least one directional wheel 4 at the bottom of the straight section of the steel pipe 2. The installation position of the directional wheels 4 should be calculated to ensure that the auxiliary device remains stable and balanced when placed on the floor slab of the truss reinforcement 5, and will not tip over. The directional wheels 4 are directional bearing wheels, and their wheel body material can be nylon or rubber. During installation, a small steel plate or mounting plate can be welded to the bottom of the straight section of the steel pipe 2, and then the directional wheels 4 can be fixed to the steel plate by bolts or welding. After installation, check that all directional wheels 4 rotate flexibly and that their installation height is consistent to ensure that the auxiliary device can move smoothly along a straight line.

[0033] Before inserting the reinforcing bars, they need to be filled. Insert the reinforcing bar to be inserted into the open end 3 of the straight section of the steel pipe 2, and continue pushing it inward until the tip of the reinforcing bar enters the bullet-shaped front section 1. The length of the reinforcing bar should be pre-cut according to the design drawings, and its diameter should match the inner diameter of the steel pipe, allowing for smooth sliding without excessive gaps. During insertion, a small amount of lubricant, such as waste machine oil or special lubricant, can be applied to the surface of the reinforcing bar or the inner wall of the steel pipe to reduce pushing resistance. After filling, the tail end of the reinforcing bar should protrude a certain length from the open end of the straight section of the steel pipe 2 so that it can be held when the auxiliary device is subsequently pulled out.

[0034] After loading is complete, the insertion operation can begin. The operator lifts the auxiliary device, aligning the bullet-shaped front end 1 with the target gap between the truss reinforcement bars 5 in the precast composite slab. The truss reinforcement bars 5 are typically composed of upper chord reinforcement bars 51, lower chord reinforcement bars 52, and web reinforcement bars 53, forming a triangular truss structure. During alignment, ensure that the centerline of the bullet-shaped front end 1 is substantially coincident with the centerline of the gap. Then, smoothly push the auxiliary device horizontally. During the pushing process, the directional wheels 4 installed at the bottom will roll on the floor surface of the truss reinforcement bars 5, providing guidance and support, greatly reducing pushing friction, and effectively preventing the device from tilting during the pushing process. The operator only needs to apply a horizontal pushing force, and the bullet-shaped front end will guide the entire device and the internal reinforcement bars smoothly through the dense and complex obstacles between the truss reinforcement bars 5.

[0035] Once the reinforcing bar has successfully passed through the entire gap and reached the position required by the design drawings, the auxiliary device can be withdrawn. Since the reinforcing bars are inserted to the other end, the operator can directly access the auxiliary device after insertion. The operator holds the end of the reinforcing bar protruding from the straight section of the steel pipe 2, keeping it still, while smoothly withdrawing the auxiliary device. Because the inner walls of the bullet-shaped front section 1 and the straight section of the steel pipe 2 are smooth and may be coated with lubricant, the friction between the reinforcing bar and the inner wall of the steel pipe is small, allowing the device to easily separate from the positioned reinforcing bar. After withdrawing the device, check whether the position of the reinforcing bar meets the requirements. If necessary, a small wooden mallet can be used for fine-tuning to finally complete the insertion of a single reinforcing bar.

[0036] Furthermore, the auxiliary device is made by cutting and welding scrap steel pipes on site. Regarding the manufacture of the auxiliary device, it is specifically noted that it can be made using existing scrap materials on site, reflecting the economic and environmental benefits of this method. For example, short steel pipes of suitable diameter can be selected from the waste pile, and one end can be machined into a tapered shape using an angle grinder or flame cutter. Straight sections of steel pipe 2 can also be made from scrap steel pipes of different diameters, but their inner diameter should be slightly larger than the diameter of the reinforcing bar to be threaded, typically 5-10 mm larger. Welding operations can be performed by certified welders on site to ensure that the welding quality meets the construction strength requirements.

[0037] Furthermore, three directional wheels 4 are arranged in a triangular pattern at the bottom of the straight section of the steel pipe 2. This triangular arrangement of three directional wheels 4 at the bottom of the straight section of the steel pipe 2 is the optimal solution. These three points form a stable support surface. Two wheels can be installed near the middle of the straight section of the steel pipe 2, and the third wheel can be installed near the beginning or end, forming an isosceles or right-angled triangle layout. Each directional wheel 4 is welded to the bottom of the steel pipe via an independent mounting bracket. The height of the bracket can be adjusted as needed to change the ground clearance of the auxiliary device, adapting to different construction environments.

[0038] Furthermore, the method also includes the steps of adjusting the diameter of the straight section steel pipe 2 or adjusting the installation height of the directional wheel 4 according to the thickness of the composite slab. To adapt to different construction site conditions, this method also includes an adjustment step. The thickness of the composite slab may vary from project to project, resulting in different overall heights of the truss reinforcement 5. Therefore, the diameter of the straight section steel pipe 2 can be adjusted. For example, when the slab thickness is large and the truss is high, a straight section steel pipe 2 with both a larger inner and outer diameter can be selected to increase the rigidity of the entire device and provide sufficient operating space above the truss. On the other hand, the overall operating height of the auxiliary device can also be changed by adjusting the height of the mounting support of the directional wheel 4, so that the wheel can be effectively supported on the floor slab, and the bullet-shaped front end section 1 can be at a suitable entry height. This can be achieved by adding a steel plate under the support or replacing the support with one of different heights.

[0039] Furthermore, the truss reinforcement 5 includes an upper chord reinforcement 51 and two lower chord reinforcements 52 whose sidewalls are respectively connected to the sidewalls of the upper chord reinforcement 51. When the insertion direction of the reinforcement to be inserted is perpendicular to the lower chord reinforcement 52, the curvature and length of the bullet-shaped front end segment 1 are adjusted. When the insertion direction of the reinforcement to be inserted is perpendicular to the lower chord reinforcement 52, the construction difficulty will increase significantly because the reinforcement needs to pass through the gap between the upper chord reinforcement 51 and the lower chord reinforcement 52 to its adjacent gap, forming a path similar to a "roller coaster" (e.g., Figure 4Traditional manual insertion methods are extremely difficult to correct in such situations. This method provides further adjustment steps for this specific condition. The curvature of the bullet-shaped front section 1 can be adjusted to better match the path required to cross the lower chord reinforcement 52. Simultaneously, the length of the bullet-shaped front section 1 can be appropriately increased, making the guiding section longer and providing better guidance, enabling a smoother crossing of the lower chord reinforcement 52, thereby ensuring the longitudinal reinforcement is accurately inserted to the required position.

[0040] Furthermore, adjusting the curvature of the bullet-shaped front end segment 1 involves heating and bending the bullet-shaped front end segment 1 or replacing it with a front end segment of a different curvature. There are several ways to adjust the curvature of the bullet-shaped front end segment 1. One method is to heat and bend it: using a heating tool such as an oxyacetylene flame, the part of the bullet-shaped front end segment 1 to be bent is locally heated until it becomes red-hot and soft. Then, it is placed against a pre-made mold or external force is applied using machinery to bend it into the required curvature, followed by natural cooling or water cooling for shaping. Another more convenient method is to replace the front end segment with a different curvature: a series of bullet-shaped front end segments 1 with different bending curvatures and lengths can be pre-made for use. During on-site construction, based on the current working conditions (e.g., the diameter and spacing of the lower chord reinforcing bars 52), the most suitable one is selected and quickly installed onto the straight section of the steel pipe 2 via welding or flange bolt connection, thereby achieving rapid adaptation and ensuring construction efficiency.

[0041] In practical applications, construction workers need to apply this method flexibly according to the actual site conditions. For example, when pushing the auxiliary device, a uniform and steady speed should be maintained to avoid rapid impacts, so as not to disturb the already installed truss reinforcement bars 5. For the insertion of extra-long reinforcement bars, segmented insertion or multi-person cooperation can be used.

[0042] In summary, this specific embodiment details each step of the method of the present invention, the manufacturing and adjustment methods of the device, and the contingency measures for dealing with different working conditions. Through the above methods, those skilled in the art can fully understand and implement the present invention, which can achieve rapid and accurate insertion of reinforcing bars in prefabricated floor slab construction, effectively solving the problems of low efficiency and poor accuracy of traditional manual reinforcing bar insertion.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A construction method for reinforcing steel bars in composite slabs, characterized in that, Includes the following steps: S1. Prepare an auxiliary device, which includes a bullet-shaped front end section (1) and a straight section steel pipe (2), and weld the bullet-shaped front end section (1) and the straight section steel pipe (2) together; S2. Install at least one directional wheel (4) at the bottom of the straight section of the steel pipe (2); S3. Insert the reinforcing bar to be inserted from the straight section opening end (3) of the straight section steel pipe (2) and push it into the bullet-shaped front end section (1); S4. Align the auxiliary device with the gap of the truss reinforcement (5) and push the auxiliary device in the horizontal direction; S5. After the reinforcing bar passes through the gap, the auxiliary device is pulled out to complete the insertion of the reinforcing bar.

2. The construction method for reinforcing steel bars in composite slabs according to claim 1, characterized in that, The auxiliary device was made by cutting and welding discarded steel pipes on site.

3. The construction method for reinforcing steel bars in composite slabs according to claim 1, characterized in that, The number of the directional wheels (4) is three, arranged in a triangle at the bottom of the straight section of the steel pipe (2).

4. The construction method for reinforcing steel bars in composite slabs according to claim 1, characterized in that, It also includes the steps of adjusting the diameter of the straight section steel pipe (2) or adjusting the installation height of the directional wheel (4) according to the thickness of the composite plate.

5. The construction method for reinforcing steel bars in composite slabs according to claim 1, characterized in that, The truss reinforcement (5) includes an upper chord reinforcement (51) and two lower chord reinforcements (52) whose side walls are respectively connected to the side walls of the upper chord reinforcement (51). When the insertion direction of the reinforcement to be inserted is perpendicular to the lower chord reinforcement (52), the curvature and length of the bullet-shaped front end section (1) are adjusted.

6. The construction method for reinforcing steel bars in composite slabs according to claim 5, characterized in that, The step of adjusting the curvature of the bullet-shaped front end segment (1) includes heating and bending the bullet-shaped front end segment (1) or replacing the front end segment with a different curvature.

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