Construction method for simultaneously increasing the cross section of a beam slab

Abstract

This application relates to the field of building construction technology and discloses a construction method for simultaneously increasing the cross-section of beams and slabs, including the following steps: 1. Roughening the relevant beam and slab areas; 2. First, completing the binding of the beam reinforcement, then inserting the increased longitudinal reinforcement of the beam into the frame columns on both sides as required, and extending the beam stirrups from the slab surface after the increased cross-section; 3. When the width of the increased beam cross-section meets the anchorage length of the slab reinforcement, directly inserting the slab reinforcement into the beam reinforcement, and performing bending anchorage treatment at the position where the slab reinforcement enters the beam reinforcement; when the width of the increased beam cross-section does not meet the anchorage length of the slab reinforcement, it is necessary to insert slab reinforcement to a sufficiently deep depth on the side of the beam based on the increased beam cross-section width, and bind the slab reinforcement; 4. When setting up the formwork after the reinforcement binding is completed, first complete the formwork of the beam and slab as required, and then reinforce the junction of the slab and beam. The construction method of this application can save construction costs, shorten the construction period, and improve on-site construction efficiency.

Description

Technical Field

[0001] This application relates to the field of building construction technology, specifically to a construction method for simultaneously increasing the cross-section of beams and slabs. Background Technology

[0002] When renovating existing structures, the change in function and increased load necessitate reinforcement. This reinforcement often involves increasing the cross-section of beams and slabs (widening beams and thickening slabs). CN216840773U discloses a beam enlargement reinforcement structure, comprising a concrete enlargement section connecting the lower surface and two sides of an existing beam, and a steel cage structure within the concrete enlargement section. The steel cage structure includes multiple newly added bottom longitudinal bars arranged parallel to the beam's length direction and side longitudinal bars located on both sides of the existing beam. The middle bottom longitudinal bar is embedded in an existing column, while the bottom and side longitudinal bars on both sides are bent outwards near the existing column, so that their ends are outside the existing column and embedded in another beam or wall at the corresponding position. The concrete enlargement section forms an expansion portion near the existing column.

[0003] However, if the beam cross-section is enlarged before the slab cross-section is enlarged during construction, it will not only increase the construction time, but also require waiting for the beam concrete to reach the required strength before the floor slab reinforcement is installed. During the reinforcement installation process, the efficiency will be reduced due to the influence of the beam reinforcement. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the existing technology, the purpose of the present invention is to provide a construction method for simultaneously increasing the cross-section of beams and slabs.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A construction method for simultaneously increasing the cross-section of beams and slabs includes the following steps:

[0007] Step 1: Roughen the surface of the beam / slab area where the cross-section needs to be increased;

[0008] Step 2: Insert steel bars on both sides and bottom of the original structural beam and tie the steel bars at the beam. Insert the additional longitudinal steel bars of the beam into the frame columns on both sides as required. Extend the stirrups of the beam with the enlarged cross section from the slab surface. Set a pad on the slab surface and perform through-hole plug welding on the extended stirrups on the pad.

[0009] Step 3: When the width of the beam section is increased to meet the anchorage length of the slab reinforcement, the slab reinforcement is directly inserted into the beam reinforcement, but a bend anchorage treatment is required at the position where the slab reinforcement enters the beam reinforcement; when the width of the beam section is increased but does not meet the anchorage length of the slab reinforcement, slab reinforcement needs to be inserted to a sufficiently deep depth on the side of the beam based on the increased beam section width. After the inserted reinforcement meets the anchorage requirements, the slab reinforcement is tied.

[0010] Step 4: When setting up the formwork after the reinforcement is tied, first set up the formwork for the beams and slabs as required, and then reinforce the junction of the slab and the beam.

[0011] Furthermore, in step one, during the roughening process, the original plaster layer of the beam and slab, as well as the concrete with honeycomb, pitting, or other loose textures, must be removed.

[0012] Furthermore, in step two, if the beam cross-section is increased on one side, one side of the stirrup extends from the slab surface, and the other side is welded to the original beam stirrup.

[0013] Preferably, the pad has a width of 40mm*40mm and a thickness of 8mm.

[0014] Furthermore, in step four, a section of L75 angle steel is placed at the junction of the beam and slab formwork, and the angle steel is reinforced using M12 chemical anchors.

[0015] Furthermore, the spacing between chemical anchors is 500 mm.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This application proposes a construction method for simultaneously increasing the cross-section of beams and slabs that is simple in structure, reasonable in design and convenient in construction, thereby saving construction costs, shortening the construction cycle and improving on-site construction efficiency. Attached Figure Description

[0017] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0018] Figure 1 Schematic diagram of beam stirrup fixing;

[0019] Figure 2 A schematic diagram of slab reinforcement insertion when the beam cross-section width is increased to meet the anchorage length of slab reinforcement 5;

[0020] Figure 3 A schematic diagram of slab reinforcement insertion when increasing the width of the beam section does not meet the anchorage length of slab reinforcement 5;

[0021] Figure 4 This is a schematic diagram showing the situation after the reinforcing bars have been tied and the formwork for the beams and slabs has been erected.

[0022] Figure 5 A schematic diagram of the reinforcement structure at the junction of the slab and the beam;

[0023] Markings in the diagram: 1-Beam-slab area, 2-Added longitudinal reinforcement to the beam, 3-Beam stirrups, 4-Slab base plate, 5-Slab reinforcement, 6-Formwork for beams and slabs, 7-Angle steel, 8-Chemical anchor bolts. Detailed Implementation

[0024] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention. These all fall within the scope of protection of the present invention.

[0025] A construction method for simultaneously increasing the cross-section of beams and slabs includes the following steps:

[0026] Step 1: Roughen the beam and slab area 1 where the cross-section needs to be increased. When roughening, remove the original plaster layer and the concrete with honeycomb, pitting or other loose conditions.

[0027] Step 2: Insert reinforcing bars on both sides and bottom of the original structural beam, and tie the reinforcing bars at the beam. Insert the additional longitudinal reinforcing bars 2 into the frame columns on both sides as required. Extend the increased cross-section beam stirrups 3 from the slab surface (if the increased cross-section is on one side, one side of the stirrup extends from the slab surface, and the other side is welded to the original beam stirrups). Place a 40mm*40mm wide and 8mm thick pad 4 on the slab surface, and perform through-hole plug welding on the extended stirrups on the pad. Figure 1 As shown;

[0028] Step 3: When the beam cross-section width is increased to meet the anchorage length of the slab reinforcement 5, the slab reinforcement is directly inserted into the beam reinforcement (avoiding the beam reinforcement), but a bending anchorage treatment is required at the position where the slab reinforcement extends into the beam reinforcement, such as... Figure 2 As shown; when increasing the beam's cross-sectional width does not meet the anchorage length requirement of the slab reinforcement, it is necessary to insert slab reinforcement to a sufficiently deep depth into the beam side, based on the increased beam cross-sectional width. This involves drilling holes in the beam, with the hole depth plus the required increase in beam width, to meet the anchorage length requirement of the slab reinforcement. Once the inserted reinforcement meets the anchorage requirement, as shown... Figure 3 As shown, the slab reinforcement bars are tied;

[0029] Step 4: When setting up the formwork after the rebar is tied, if... Figure 4 As shown, after the beam and slab formwork 6 is erected as required, when reinforcing the junction of the slab and beam, a section of L75 angle steel 7 is placed at the junction of the beam and slab formwork, as follows. Figure 5As shown, the angle steel is reinforced using M12 chemical anchors 8, with a spacing of 500mm between the chemical anchors.

[0030] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A construction method for simultaneously increasing the cross-section of beams and slabs, characterized in that, Includes the following steps: Step 1: Roughen the surface of the beam / slab area where the cross-section needs to be increased; Step 2: Insert steel bars on both sides and bottom of the original structural beam, and insert the longitudinal steel bars added to the beam into the frame columns on both sides as required. Extend the stirrups of the beam after the cross-section is enlarged from the slab surface. Place a pad on the slab surface and perform through-hole plug welding on the pad. If the beam cross-section is enlarged on one side, the stirrups extend from the slab surface on one side and are welded to the original beam stirrups on the other side. Step 3: When the width of the beam section is increased to meet the anchorage length of the slab reinforcement, the slab reinforcement is directly inserted into the beam reinforcement, but a bend anchorage treatment is required at the position where the slab reinforcement enters the beam reinforcement; when the width of the beam section is increased but does not meet the anchorage length of the slab reinforcement, slab reinforcement needs to be inserted to a sufficiently deep depth on the side of the beam based on the increased beam section width. After the inserted reinforcement meets the anchorage requirements, the slab reinforcement is tied. Step 4: When the formwork is erected after the reinforcement is tied, first erect the formwork for the beam and slab according to the requirements, and then reinforce the position at the junction of the slab and the beam, including: placing a section of L75 angle steel at the junction of the beam and slab formwork, and using M12 chemical anchors to reinforce the angle steel.

2. The construction method for simultaneously increasing the cross-section of beams and slabs according to claim 1, characterized in that, In step one, when roughening the surface, the original plaster layer of the beam and slab, as well as the loose concrete with honeycomb or pitted surfaces, need to be removed.

3. The construction method for simultaneously increasing the cross-section of beams and slabs according to claim 1, wherein the pad plate has a width of 40mm*40mm and a thickness of 8mm.

4. The construction method for simultaneously increasing the cross-section of beams and slabs according to claim 1, wherein the spacing of chemical anchors is 500 mm.

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