Construction method for longitudinal load-bearing steel bars of constructional column

Abstract

The invention discloses a constructional column longitudinal load-bearing steel bar construction method which comprises the following steps: construction preparation including tool preparation, material preparation and on-site preparation; planting full-length steel bars at the bottom of the constructional column, firstly drilling according to the depth required by the design, then injecting glue, and finally planting longitudinal load-bearing steel bars of the constructional column into the holes, with the length of the steel bars being the clear height; binding a constructional column hoop; short ribs are planted on the top of the constructional column. The top embedded steel bar is prevented from falling before the adhesive glue is solidified, the construction efficiency is improved, the construction quality is guaranteed, and meanwhile the construction cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of structural column construction, and more particularly to a construction method for longitudinal stressed steel bars of a structural column. Background Art

[0002] During the construction of structural columns, both the bottom and top steel bars can be pre-embedded. However, in practice, it is found that the pre-embedded bottom steel bars will be displaced due to vibration and collision during the concrete pouring process. The top pre-embedded steel bars require holes to be drilled in the formwork to insert the bars. The formwork is difficult to remove and the turnover rate is reduced. Therefore, the post-embedded reinforcement method is generally adopted.

[0003] However, the rebar at the top of the structural column will fall due to gravity before the adhesive solidifies, and the anchoring length is insufficient, resulting in failure to pass the pull-out test. Summary of the Invention

[0004] In response to the problems existing in the prior art, the purpose of the present invention is to provide a method for constructing longitudinal stress-bearing steel bars in structural columns, which can prevent the top embedded steel bars from falling before the adhesive solidifies, thereby improving construction efficiency, ensuring construction quality, and reducing construction costs.

[0005] The present invention adopts the following technical solutions:

[0006] A method for constructing longitudinal stress-bearing steel bars of a structural column, comprising the following steps:

[0007] S1. Construction preparation, including tool preparation, material preparation and site preparation;

[0008] S2. Plant long reinforcement at the bottom of the structural column

[0009] First, drill the hole to the depth required by the design, then inject glue, and finally implant the longitudinal stress-bearing steel bars of the structural column into the hole. The length of the steel bar is the net height.

[0010] S3, tie the structural column hoops;

[0011] S4. Plant short reinforcement bars at the top of the structural column.

[0012] Furthermore, in step S1, the surface temperature of the substrate is not lower than 15°C, and the hole layout and positioning are checked to be correct.

[0013] Furthermore, in step S2, the diameter of the drilled hole is one size larger than the diameter of the steel bar.

[0014] Furthermore, in step S2, the hole is cleaned after drilling is completed. When cleaning the hole, first use a hair dryer to blow the hole continuously for 10-15 seconds, then use a brush to brush the hole wall back and forth 3 times, repeat the above steps 3 times until there is no visible dust in the hole, and seal the hole mouth with a cotton plug.

[0015] Furthermore, in step S3, after the reinforcement is planted at the bottom of the structural column for 24 hours, the stirrups are tied.

[0016] Furthermore, in step S4, the method of step S2 is first used to perform drilling, hole cleaning and glue injection, and then short reinforcement is implanted at the top of the structural column, and the length of the short reinforcement meets the anchoring and overlap requirements.

[0017] Furthermore, the implanted top short reinforcement is tied and overlapped with the corresponding bottom full-length reinforcement to fix the top reinforcement of the structural column.

[0018] Beneficial effects

[0019] This invention improves the structure and construction method of the structural column reinforcement. The longitudinal reinforcement of the structural column consists of a continuous bottom-planted steel bar and short top-planted bars. This prevents the top-planted bars from falling before the adhesive sets, improving construction quality and ensuring the pass rate of pull-out tests. Compared to traditional construction methods, this construction method also eliminates an overlap length for each longitudinal reinforcement bar and eliminates the need for additional stirrups in the overlap area, saving materials, reducing costs, and protecting the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of an embodiment of the present invention after construction; DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0022] As shown in the figure, the present invention discloses a method for constructing longitudinal stress-bearing steel bars of a structural column, comprising the following steps:

[0023] S1. Construction preparation, including tool preparation, material preparation and site preparation;

[0024] Tools required: torque-controlled electric drill (speed ≥ 800 r / min, drill bit diameter is configured according to the steel bar diameter + 2mm), high-pressure hair dryer (air pressure ≥ 0.4 MPa), nylon brush (bristle length ≥ 50 mm), and height-adjustable mobile scaffolding (load-bearing capacity ≥ 200 kg).

[0025] Material preparation: Use Class A modified epoxy resin anchoring adhesive (splitting tensile strength ≥ 15MPa, steel-concrete bond strength ≥ 6MPa), and HRB400 hot-rolled ribbed steel bars (yield strength standard value 400MPa).

[0026] On-site conditions: Detect the surface temperature of the substrate (using an infrared thermometer) to ensure it is ≥15°C; use a laser marking instrument to mark the hole positions with an error of ≤2mm. Construction can only begin after verification by the supervisor.

[0027] S2. Plant long reinforcement at the bottom of the structural column

[0028] Drill holes according to the design depth (drilling depth = anchorage length + 10mm, anchorage length is calculated according to the Code for Design of Reinforcement of Concrete Structures GB50367-2013 and is ≥15d);

[0029] Then inject glue. Use a glue gun to slowly inject the rebar glue. The amount of glue injected should account for 2 / 3-3 / 4 of the hole depth. The glue surface should be 10-15mm away from the hole mouth. Avoid bubbles during the injection process.

[0030] Finally, the longitudinal stress-bearing steel bar 1 of the structural column is implanted into the hole, and the length of the steel bar is the net height;

[0031] S3. Tie the structural column hoop

[0032] After the bottom reinforcement is cured, the stirrups are tied according to the designed spacing (error ≤ 10mm), the stirrup hook angle is ≥ 135°, the straight section length is ≥ 10d, and the tying is firm and not loose. Compared with the traditional construction scheme, this embodiment reduces the number of stirrups;

[0033] S4. Plant 3 short bars at the top of the structural column.

[0034] In one embodiment of the present invention, in step S2, the diameter of the drilled hole is one size larger than the diameter of the steel bar, for example, a Φ12 steel bar corresponds to a hole diameter of 14 mm.

[0035] In one embodiment of the present invention, in step S2, the hole is cleaned after drilling is completed. When cleaning the hole, a hair dryer is first used to blow the hole continuously for 10-15 seconds, and then a brush is used to brush the hole wall back and forth three times. The above steps are repeated three times, that is, three blowing and three brushing are achieved, until there is no dust visible to the naked eye in the hole, and the hole opening is sealed with a cotton plug.

[0036] In one embodiment of the present invention, in step S3, after the reinforcement is planted at the bottom of the structural column for 24 hours, the stirrups 2 are tied.

[0037] In one embodiment of the present invention, in step S4, drilling, hole cleaning and glue injection are first performed in the manner of step S2, and then short reinforcement 3 is implanted at the top of the structural column, and the length of the short reinforcement 3 meets the requirements of anchoring and overlapping.

[0038] In one embodiment of the present invention, the implanted top short reinforcement 3 is tied and overlapped with the corresponding bottom full-length reinforcement 1, and the overlap length is greater than or equal to 50 dm, thereby fixing the top reinforcement of the structural column.

[0039] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any person skilled in the art who, within the technical scope disclosed by the present invention, makes equivalent substitutions or modifications based on the technical solutions and improved concepts of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. A method for constructing longitudinal stress-bearing steel bars of a structural column, characterized by: The following steps are involved: S1. Construction preparation, including tool preparation, material preparation and site preparation; S2. Plant long reinforcement at the bottom of the structural column First, drill the hole to the depth required by the design, then inject glue, and finally implant the longitudinal stress-bearing steel bars of the structural column into the hole. The length of the steel bar is the net height. S3, tie the structural column hoops; S4. Plant short reinforcement bars at the top of the structural column.

2. A construction method for longitudinal stress reinforcement of a structural column according to claim 1, characterized in that: In step S1, the surface temperature of the substrate is not lower than 15° C., and the hole layout and positioning are checked to be correct.

3. The method for constructing longitudinal stress-bearing steel bars of a structural column according to claim 1, characterized in that: In step S2, the diameter of the drilled hole is one size larger than the diameter of the steel bar.

4. A construction method for longitudinal stress reinforcement of a structural column according to claim 1, characterized in that: In step S2, the hole is cleaned after drilling is completed. When cleaning the hole, first use a hair dryer to blow the hole continuously for 10-15 seconds, then use a brush to brush the hole wall back and forth 3 times, repeat the above steps 3 times until there is no visible dust in the hole, and seal the hole mouth with cotton plug.

5. The method for constructing longitudinal stress-bearing steel bars of a structural column according to claim 1, characterized in that: In step S3, after the reinforcement is planted at the bottom of the structural column for 24 hours, the stirrups are tied.

6. The method for constructing longitudinal stress-bearing steel bars of a structural column according to claim 1, characterized in that: In step S4, first drill, clean and inject glue in the same manner as in step S2, and then implant short reinforcement bars at the top of the structural column. The length of the short reinforcement bars meets the requirements of anchoring and overlap.

7. A method for constructing longitudinal stress-bearing steel bars of a structural column according to claim 6, characterized in that: Tie and overlap the implanted top short reinforcement with the corresponding bottom full-length reinforcement to fix the top reinforcement of the structural column.

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