Steel bar binding method for ensuring thickness of beam bottom concrete

Abstract

The invention relates to a steel bar binding method for ensuring the thickness of beam bottom concrete, which comprises the following steps of: arranging hanging bars below steel bars at the upper part of a beam, respectively arranging plastic cushion blocks at two ends of the hanging bars, and combining prefabricated mortar cushion blocks for use. And adjusting the thickness of the lower concrete protection layer of the large-section beam. By combining the traditional cushion block, the hanging bar and the plastic cushion block, the more effective thickness of the concrete protection layer is realized, the construction quality can be ensured, the manpower and reworking rectification for manually adjusting the cushion block for the second time can be reduced, the construction period is shortened, the reutilization of steel bar waste can be realized, and the project becomes effective.

Description

Technical Field

[0001] The present invention relates to the field of building construction, and more specifically, to a steel bar binding method for ensuring the thickness of the concrete at the bottom of a beam. Background Art

[0002] During the construction of the main structure steel bar project in the field of building construction, the reinforced concrete beam, as the main load-bearing member of the structure, its construction quality is of crucial importance. The beam mainly bears transverse forces and shear forces, and the main deformation is bending. The design of large-section beams is to improve the bearing capacity, stiffness, stability, seismic performance, and durability.

[0003] During the construction process of the steel bar project, more and more large-section beam designs are encountered. The cover thickness of large-section beams is generally 25 mm. To ensure the cover thickness of the steel bars, precast mortar pads or precast plain concrete pads with low strength are usually used, and the spacing is not greater than 500 mm. These pads have good effects when used in reinforced concrete beams with smaller cross-sections and less dense reinforcement. However, when used in reinforced concrete beams with larger cross-sections and more dense reinforcement, there will be problems such as inaccurate positioning of the concrete pads, easy breakage, difficult fixation of the pads under the beam, resulting in deviation, and being crushed by the steel bars.

[0004] Specifically, large-section beams have more steel bar reinforcement, deeper cross-sections, and greater loads. Due to the uneven quality of traditional precast mortar pads, it is difficult to grasp the uniformity of their stiffness and dimensions, resulting in the pads being easily crushed, deviated, and even unable to be effectively adjusted. This not only consumes a large amount of labor and time but also is difficult to achieve the ideal construction effect. At the same time, the damage and deviation of the pads will also cause the cover thickness of the steel bars not to meet the design requirements, affecting the durability of the concrete and further affecting the structural safety. This will lead to the inability to effectively protect the steel bars, and in severe cases, it may cause structural cracking, reduced bearing capacity, and even major accidents.

[0005] Therefore, reasonably selecting and setting pads or shims to ensure that the steel bars are laid in the correct position is an important measure to ensure the cover thickness. The traditional pad supporting method can no longer meet the construction requirements of large-section beams. Summary of the Invention

[0006] The present invention aims to overcome the defects of the prior art and provides a steel bar binding method for ensuring the thickness of the concrete at the bottom of a beam, solving the problems of deviation in the cover thickness of the upper and lower parts of the large-section beam, difficult fixation of the pads under the beam, resulting in deviation, and being crushed by the steel bars.

[0007] To solve the above technical problems, the present invention is implemented as follows: A steel bar binding method for ensuring the concrete thickness at the bottom of a beam, characterized in that: it includes arranging hanger bars under the upper steel bars of the beam, plastic cushion blocks are respectively arranged at both ends of the hanger bars, and precast mortar cushion blocks are used in combination. By adjusting the positions and quantities of the hanger bars, plastic cushion blocks and precast mortar cushion blocks, the thickness of the concrete protective layer at the lower part of the large-section beam is adjusted.

[0008] The described steel bar binding method for ensuring the concrete thickness at the bottom of a beam is characterized in that: the hanger bar is a steel bar horizontally inserted under the upper steel bars of the beam, which is used to support and fix the upper steel bars, prevent them from winding upwards and causing the protective layer to be too large.

[0009] The described steel bar binding method for ensuring the concrete thickness at the bottom of a beam is characterized in that: the plastic cushion blocks are arranged at both ends of the hanger bar, which are used to disperse the load, adjust the elevation of the hanger bar, fix the hanger bar and prevent exposed steel bars. Its tensile and compressive strengths are higher than 4.0 Mpa, and it can withstand the walking of construction workers and general construction loads without breaking.

[0010] The described steel bar binding method for ensuring the concrete thickness at the bottom of a beam is characterized in that: the precast mortar cushion block is used as an auxiliary means, which is arranged at the lower part of the beam steel bar framework and is used to initially adjust the concrete thickness at the bottom of the beam.

[0011] The described steel bar binding method for ensuring the concrete thickness at the bottom of a beam is characterized in that: at least two mortar cushion blocks are arranged under the beam steel bar framework, and their horizontal spacing is determined according to the specific situation of the beam, and the longitudinal spacing is 1000 mm; the hanger bar passes through under the upper skin steel bars of the beam, and plastic cushion blocks are sleeved at both ends of it. The spacing of the plastic cushion blocks is the same as that of the mortar cushion blocks, so that a certain distance is maintained between the lower part of the hanger bar and the top of the floor formwork.

[0012] The described steel bar binding method for ensuring the concrete thickness at the bottom of a beam is characterized in that: this method also includes, after the installation of the beam steel bar framework and formwork is completed, adjusting the positions and heights of the hanger bars, plastic cushion blocks and precast mortar cushion blocks according to the design requirements to ensure that the concrete thickness at the bottom of the beam meets the design requirements; before the concrete pouring, checking and fixing the hanger bars, plastic cushion blocks and precast mortar cushion blocks to prevent them from shifting or being damaged.

[0013] The described steel bar binding method for ensuring the concrete thickness at the bottom of a beam is characterized in that: the hanger bar is made of well-preserved steel bar waste.

[0014] The beneficial effects of the present invention are as follows: As can be seen from the above technical solution, the present application provides a steel bar binding method for ensuring the concrete thickness at the bottom of a beam. By combining the use of hanger bars, plastic cushion blocks, and precast mortar cushion blocks, the thickness of the concrete protective layer at the upper and lower parts of the beam can be adjusted and controlled more precisely to ensure meeting the design requirements. This helps to improve the durability and load-bearing capacity of reinforced concrete beams and effectively guarantees the thickness of the protective layer of large-section beams.

[0015] The hanger bars are generally made of well-preserved steel bar waste, which helps to achieve the reuse of resources, reduce construction costs, and is also beneficial to environmental protection. The plastic cushion blocks have the advantages of light weight, small volume, easy fixation, high strength, and good compatibility with concrete. These characteristics enable the plastic cushion blocks to better withstand construction loads, are not easily crushed or displaced, thus further ensuring the thickness of the steel bar protective layer at the bottom of the beam.

[0016] This method is simple to operate, easy for workers to master, and firmly fixed without easy deviation. This helps to reduce the labor for secondary adjustment of cushion blocks by workers and rework rectification, thus accelerating the construction period and improving construction efficiency.

[0017] The present invention can reduce rework rectification, accelerate the construction period, and at the same time achieve the reuse of resources, so it is expected to generate good economic benefits. In addition, this technical solution also helps to improve the durability and load-bearing capacity of reinforced concrete beams, thus ensuring structural safety and having good social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following further elaborates on the present invention in detail in conjunction with the drawings and embodiments: Figure 1 It is the front view of the present invention; Figure 2 It is the top view of the present invention; Figure 3 It is the left view of the present invention; In the figure: 1 - steel bar skeleton; 2 - formwork; 3 - mortar cushion block; 4 - hanger bar; 5 - plastic cushion block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The technical solutions of the embodiments of the present application will be clearly and completely described below in conjunction with the drawings. Obviously, the described embodiments are a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope claimed by the present application. Embodiment 1 As Figures 1-3Shown: A steel bar binding method for ensuring the concrete thickness at the bottom of a beam, including arranging a hanger bar 4 under the upper steel bars of the beam, respectively arranging plastic cushion blocks 5 at both ends of the hanger bar, and using precast mortar cushion blocks 3 in combination. By adjusting the positions and quantities of the hanger bar, plastic cushion blocks and precast mortar cushion blocks, the thickness of the concrete protective layer at the lower part of the large-section beam is adjusted.

[0020] The hanger bar is a steel bar horizontally inserted under the upper steel bars of the beam, and its length and diameter are selected according to the load and steel bar reinforcement conditions of the beam. Both ends of the hanger bar are fixedly connected to the plastic cushion blocks, which are used to support and fix the upper steel bars, prevent them from winding upwards and causing the protective layer to be too large.

[0021] The plastic cushion blocks are arranged at both ends of the hanger bar, which are used to disperse the load, adjust the elevation of the hanger bar, fix the hanger bar and prevent exposed steel bars. Their tensile and compressive strengths are higher than 4.0 Mpa, and they can withstand the walking of construction workers and general construction loads without breaking. The plastic cushion blocks have the characteristics of light weight, high strength, easy fixation and good compatibility with concrete, and are used to disperse the load, adjust the elevation of the hanger bar, fix the hanger bar and prevent exposed steel bars.

[0022] The precast mortar cushion blocks are used as an auxiliary means, which are arranged under the steel bar framework 1 of the beam and are used to initially adjust the concrete thickness at the bottom of the beam. In combination with the hanger bar and plastic cushion blocks, they jointly adjust the thickness of the protective layer under the large-section beam to ensure that the thickness of the protective layer of the entire beam meets the design requirements.

[0023] At least two mortar cushion blocks are arranged under the steel bar framework of the beam, and their transverse spacing is determined according to the specific situation of the beam, and the longitudinal spacing is 1000 mm; the hanger bar passes through under the upper skin steel bars of the beam, and plastic cushion blocks are sleeved at both ends of it. The spacing of the plastic cushion blocks is the same as that of the mortar cushion blocks, so that there is a certain distance between the lower part of the hanger bar and the top of the floor formwork.

[0024] Furthermore, this method also includes, after the installation of the steel bar framework 1 and formwork 2 of the beam is completed, adjusting the positions and heights of the hanger bar, plastic cushion blocks and precast mortar cushion blocks according to the design requirements to ensure that the concrete thickness at the bottom of the beam meets the design requirements; before the concrete pouring, checking and fixing the hanger bar, plastic cushion blocks and precast mortar cushion blocks to prevent them from shifting or being damaged.

[0025] Furthermore, the hanger bar is made of well-preserved steel bar waste, and the specifications are selected to meet the design requirements, realizing the secondary utilization of the waste. This helps to realize the recycling of resources, reduce the construction cost, and also helps with environmental protection.

[0026] Embodiment 2 Two mortar pads (10 mm high) are set under the beam steel bar cage 1, and the transverse spacing varies with the beam, while the longitudinal spacing is 1000 mm (the traditional single-pad mode is generally 500 - 800 mm). A hanger bar 4 passes horizontally under the upper beam steel bars. Plastic pads 5 are sleeved at both ends of the hanger bar (the plastic pads mainly serve to disperse the load, adjust the elevation of the hanger bar, fix the hanger bar, and prevent exposed steel bars), and the spacing is the same as that of the mortar pads 3, so that the distance from the lower part of the hanger bar to the top of the floor formwork is 3 mm.

[0027] The quality of traditional precast mortar protective layer pads varies greatly, and it is difficult to grasp the unity of their stiffness and dimensions, and it is even difficult to fix them firmly and effectively. At the same time, due to more reinforcement, deeper cross-section, and greater load of the steel bars of large-section beams, it is very easy for the pads to be crushed, displaced, and even unable to be adjusted effectively, consuming a lot of labor and time but difficult to achieve the ideal effect. However, in the special-shaped stirrup technology for large-section beams provided by the present invention, plastic pads, hanger bars, and traditional pads jointly bear the load, so that the traditional pads will not be damaged due to the load. Moreover, the hanger bars are generally short in length and can be made of waste steel bars, realizing the secondary utilization of waste materials; the plastic pads are more standard and unified in size, and the plastic pads are light in weight, small in volume, easier to fix, and high in strength. Generally, their tensile and compressive strengths are higher than 4.0 Mpa, and they can withstand the walking of construction workers and general construction loads without breaking. At the same time, they have good compatibility with concrete and will not affect the structure. The cost is low, and the construction unit can directly order from the manufacturer according to the design requirements without special personnel to make mortar and supports, saving manpower, materials, and construction period. The hanger bars are made of well-preserved waste steel bars, and the specifications of 16 or 25 can be selected (if thicker steel bar models are used, the traditional mortar pads can be cancelled). Through the combination of traditional pads, hanger bars, and plastic pads, a more effective concrete protective layer thickness is realized. By adding hanger bars, they can even be tied to the steel bar cages of the slab and beam, and in the form of additional steel bars on both sides of the beam, the structural strength can be increased to a certain extent. This method can not only ensure the construction quality, but also reduce the manpower and rework for secondary adjustment of the pads, speed up the construction period, and is expected to produce good economic and social benefits.

[0028] The above are only the embodiments provided by this application and are not used to limit this application. Although this application has been described in detail with reference to the embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

1. A method for tying steel bars to ensure the thickness of concrete at the bottom of a beam, characterized in that: The method includes setting hangers under the upper steel bars of the beam, setting plastic pads at both ends of the hangers, and using prefabricated mortar pads in combination. By adjusting the position and quantity of the hangers, plastic pads and prefabricated mortar pads, the thickness of the concrete protective layer at the bottom of the large-section beam can be adjusted.

2. A method for tying steel bars to ensure the thickness of concrete at the bottom of a beam according to claim 1, characterized in that: The hanger bars are steel bars that are inserted transversely below the upper steel bars of the beam and are used to support and fix the upper steel bars to prevent them from winding around and causing the protective layer to be too large.

3. A method for tying steel bars to ensure the thickness of concrete at the bottom of a beam according to claim 1, characterized in that: The plastic pads are arranged at both ends of the hanger bar to disperse the load, adjust the hanger bar elevation, fix the hanger bar and prevent the exposed bars. The tensile and compressive strengths are higher than 4.0Mpa and can withstand the walking of construction workers and general construction loads without breaking.

4. A method for tying steel bars for ensuring the thickness of concrete at the bottom of a beam according to claim 1, characterized in that: The prefabricated mortar pad is used as an auxiliary means, which is arranged at the lower part of the beam reinforcement skeleton and is used to preliminarily adjust the thickness of the concrete at the bottom of the beam.

5. A method for tying steel bars for ensuring the thickness of concrete at the bottom of a beam according to claim 1, characterized in that: At least two mortar pads are set under the beam reinforcement skeleton. Their lateral spacing is determined according to the specific conditions of the beam, and the longitudinal spacing is 1000mm. The hanger bar passes across the upper reinforcement of the beam, and plastic pads are placed at both ends. The spacing of the plastic pads is the same as that of the mortar pads, so that the hanger bar is kept at a certain distance from the top of the floor slab formwork.

6. A method for tying steel bars for ensuring the thickness of concrete at the bottom of a beam according to claim 1, characterized in that: The method also includes adjusting the position and height of the hanger bars, plastic pads and prefabricated mortar pads according to design requirements after the installation of the beam reinforcement skeleton and formwork is completed, to ensure that the concrete thickness at the bottom of the beam meets the design requirements; before pouring the concrete, inspecting and fixing the hanger bars, plastic pads and prefabricated mortar pads to prevent them from shifting or being damaged.

7. A method for tying steel bars for ensuring the thickness of concrete at the bottom of a beam according to claim 1, characterized in that: The hanger bar is made of well-preserved steel bar waste.

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