Construction method suitable for steel reinforced concrete beam with dense longitudinal bars

Abstract

The invention relates to a construction method suitable for a steel reinforced concrete beam with dense longitudinal bars. The construction method comprises the following steps that a first opening hoop at the bottom of a beam body is installed on one side of a column body; a bottom rib located at the bottom of the beam body is installed, and the bottom rib and the first opening hoop are bound; the section steel beam is arranged between the first opening hoops in a penetrating mode; a second opening hoop is arranged at the column beam joint and connected to the end of the section steel beam; top ribs and third opening hoops are arranged at the upper part of the beam body; a first rib body and a second rib body which are adjacent to the span beam are arranged on the other side of the column body; after the column body is poured, formworks on the two sides of the beam body are installed; concrete is poured on the inner side of the formwork to form the steel reinforced concrete beam. The construction sequence is optimized through the sequence that the steel bars of the steel reinforced concrete beam are bound preferentially and the steel bars of the adjacent span beam are bound later, the conflict between the section steel beam and the adjacent span beam can be effectively avoided, effective connection between the section steel beam and the column body is achieved through the second opening hoop, stable connection of beam-column joints is achieved, and the construction efficiency and quality are improved.

Description

Technical Field

[0001] The invention relates to the field of civil engineering and construction, in particular to a construction method suitable for steel-concrete beams with dense longitudinal reinforcement. Background Art

[0002] With the development of the construction industry, steel-concrete beams and columns are increasingly being used in the structural design of buildings with high seismic protection requirements. Steel-concrete beams are widely used in high-rise buildings, large bridges, underground structures, and other projects due to their high strength, high stiffness, and excellent seismic performance.

[0003] However, during the construction of steel-concrete beams, the multiple stirrups and dense longitudinal reinforcement make it difficult to insert the stirrups and install the steel beams, which poses a great challenge to the construction of steel-concrete beams. The existing solution mainly changes the construction sequence, constructing the steel-concrete beams first, and then constructing the adjacent span beams to avoid conflicts between the steel beams and the longitudinal reinforcement of the adjacent span beams. At the same time, the steel beams are installed by cutting and bypassing the vertical reinforcement of the columns (walls). In addition, prefabricated steel-concrete beams are also used to reduce the difficulty of construction.

[0004] Although the existing technical solutions have solved the problems of steel-concrete beam construction to a certain extent, there are still some problems and shortcomings. First, the existing construction method requires cutting and bypassing the vertical reinforcement of the column (wall), which not only increases the complexity and difficulty of construction, but may also affect the overall stability of the building. Secondly, the existing construction method does not take into account the reinforcement characteristics of the steel-concrete beam and the adjacent span beam, which may lead to an unreasonable construction sequence and affect the construction efficiency and quality. Finally, the existing construction method does not take into account the combination of steel-concrete beams and columns (walls), which may affect the overall strength and seismic performance of the building. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defects of the prior art and provide a construction method for steel-concrete beams with dense longitudinal reinforcement, so as to solve the problems that the existing longitudinal reinforcement is dense, the stirrups in the beam are difficult to insert, the steel beams are embedded in the columns (walls) at both ends, the core stirrups and longitudinal reinforcement at the column (wall) nodes hinder the installation of the steel beams, and the anchorage of the longitudinal reinforcement of the adjacent span beams often conflicts with the steel beams.

[0006] The technical solution to achieve the above-mentioned purpose is: a construction method for steel-concrete beams with dense longitudinal reinforcement, comprising the following steps: installing a first open hoop at the bottom of the beam on one side of the column; installing bottom reinforcement at the bottom of the beam on the same side, and tying and fixing the bottom reinforcement to the first open hoop; passing the steel beam between the first open hoops; arranging a second open hoop at the node between the column and the beam, and connecting the second open hoop to the end of the steel beam; arranging top reinforcement and a third open hoop on the upper part of the beam, and arranging the third open hoop and the first open hoop correspondingly above and below; arranging the first and second reinforcement of the adjacent span beam on the other side of the column, connecting the first reinforcement to the bottom reinforcement and the second reinforcement to the top reinforcement respectively; after the column is cast, installing the formwork on both sides of the beam; pouring concrete inside the formwork to form a steel-concrete beam.

[0007] The present invention provides a construction method for steel-concrete beams with dense longitudinal reinforcement. The construction sequence is optimized by first tying the steel bars of the steel-concrete beam and then tying the steel bars of the adjacent span beam. This can effectively avoid conflicts between the steel beam and the adjacent span beam, improve construction efficiency and quality, and realize effective connection between the steel beam and the column through the second opening hoop, thereby achieving a stable connection between the beam-column node and improving construction quality.

[0008] A further improvement of the construction method of a steel-concrete beam suitable for dense longitudinal reinforcement of the present invention is that the first open hoop located at the bottom of the beam body is installed on one side of the column, including: arranging a bottom formwork of the beam body and setting the first open hoop on the upper side of the bottom formwork.

[0009] A further improvement of the construction method of a steel-concrete beam with dense longitudinal reinforcement of the present invention is that before passing the steel beam between the first opening hoops, the method includes: setting reinforcement holes on the two side wing plates of the steel beam located inside the column.

[0010] A further improvement of the construction method of a steel-concrete beam suitable for dense longitudinal reinforcement of the present invention is that the passing of the steel beam between the first opening hoops includes: arranging the steel beam above the bottom reinforcement and arranging the steel beam parallel to the bottom reinforcement.

[0011] A further improvement of the construction method of a steel-concrete beam suitable for dense longitudinal reinforcement of the present invention is that the top reinforcement and the third open hoop are arranged on the upper part of the beam, and the third open hoop is connected to the first open hoop accordingly, which includes: connecting the first open hoop and the third open hoop to form an annular hoop.

[0012] A further improvement of the construction method of a steel-concrete beam suitable for dense longitudinal reinforcement of the present invention is that the top reinforcement and the third open hoop are arranged on the upper part of the beam body, and the third open hoop is connected to the first open hoop accordingly, including: setting spacers between the top reinforcements on the upper part of the beam body to control the row spacing.

[0013] A further improvement of the construction method of steel-concrete beams with dense longitudinal reinforcements of the present invention is that after the column is cast, the formwork on both sides of the beam body is installed, which includes: arranging a diagonal bracing structure on the outside of the formwork.

[0014] A further improvement of the construction method of a steel-concrete beam suitable for dense longitudinal reinforcement of the present invention is that pouring concrete on the inner side of the template to form the steel-concrete beam includes: when pouring the part below the upper wing plate of the steel beam, inputting the concrete from one side of the steel beam.

[0015] A further improvement of the construction method of a steel-concrete beam suitable for dense longitudinal reinforcement of the present invention is that the pouring of concrete on the inner side of the formwork to form the steel-concrete beam also includes: when the height of the concrete exceeds the lower wing plate of the steel beam and reaches the first mark height on the web of the steel beam, the concrete is symmetrically input from both sides of the steel beam.

[0016] A further improvement of the construction method of a steel-concrete beam suitable for dense longitudinal reinforcement of the present invention is that pouring concrete on the inner side of the formwork to form the steel-concrete beam also includes: when the height of the concrete reaches a second marked height above the upper wing plate of the steel beam, inputting the concrete from the middle position of the steel beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a schematic flow chart of a construction method for steel-concrete beams with dense longitudinal reinforcement.

[0018] Figure 2 Schematic diagram of the process of step S110 of the present invention.

[0019] Figure 3 It is a structural schematic diagram of the first opening hoop of the present invention.

[0020] Figure 4 This is a schematic diagram of the process before step S130 of the present invention.

[0021] Figure 5 It is a structural schematic diagram of the reinforcement hole of the present invention.

[0022] Figure 6 Schematic diagram of the process of step S130 of the present invention.

[0023] Figure 7 Schematic diagram of the process of step S150 of the present invention.

[0024] Figure 8 It is a structural schematic diagram of the column, beam and adjacent span beam of the present invention.

[0025] Figure 9 FIG. 4 is another flowchart of step S150 of the present invention.

[0026] Figure 10 Schematic diagram of the process of step S170 of the present invention.

[0027] Figure 11 It is a structural schematic diagram of the template and the diagonal bracing structure of the present invention.

[0028] Figure 12 This is a flow chart of step S180 of the present invention.

[0029] Figure 13 FIG. 4 is another flowchart of step S180 of the present invention.

[0030] Figure 14 FIG. 4 is another flowchart of step S180 of the present invention.

[0031] In the figure: 10, beam body; 101, bottom reinforcement; 102, top reinforcement; 11, first open hoop; 12, steel beam; 121, reinforcement hole; 13, annular hoop; 14, formwork; 15, tension bolt; 16, diagonal bracing structure; 20, column; 21, second open hoop; 22, reinforcement; 23, temporary support hoop; 30, adjacent span beam; 31, first reinforcement; 32, second reinforcement. DETAILED DESCRIPTION

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0033] See Figure 1 , showing a schematic flow chart of a construction method for a steel-concrete beam with dense longitudinal reinforcement according to the present invention. The present invention provides a construction method for a steel-concrete beam with dense longitudinal reinforcement, comprising the following steps:

[0034] Execute step S110 : Install the first opening hoop 11 located at the bottom of the beam body 10 on one side of the column 20 .

[0035] The first opening hoops 11 are all vertically arranged, and the closer the first opening hoops 11 are to the column 20 , the greater the density of the arrangement.

[0036] In this embodiment, the size of the first opening hoop 11 corresponds to the size of the beam body 10 . There is no specific limitation on the size and number of the first opening hoop 11 . Next, step S120 is executed.

[0037] Execute step S120: install the bottom reinforcement 101 located at the bottom of the beam body 10 on the same side, and tie and fix the bottom reinforcement 101 to the first open hoop 11.

[0038] The bottom reinforcement 101 is arranged according to the extension direction of the beam body 10 , and the bottom reinforcement 101 is arranged on the upper side of the first opening hoop 11 . Then, step S130 is performed.

[0039] Execute step S130 : insert the steel beam 12 between the first opening hoops 11 .

[0040] The arrangement direction of the steel beam 12 is consistent with the arrangement direction of the first opening hoop 11 , and the steel beam 12 is disposed in the opening space of the first opening hoop 11 .

[0041] In this embodiment, before installing the steel beam 12 , temporary support steel bars 22 may be provided inside the column 20 to support the end of the steel beam 12 , and then step S140 is executed.

[0042] Execute step S140 : set a second open hoop 21 at the node between the column 20 and the beam 10 , and connect the second open hoop 21 to the end of the steel beam 12 .

[0043] Among them, the second open hoop 21 is hooped around the outer periphery of the longitudinal reinforcement arranged in the column 20. It is necessary to judge whether the second open hoop 21 can be directly welded to the web of the steel beam 12. If it cannot be directly welded, it is necessary to add a welded reinforcement plate on the web of the end when the steel beam 12 is manufactured.

[0044] In this embodiment, before the second opening hoop 21 is provided, the temporary support hoop 23 is used to limit the steel bars 22 in the column 20 , and then step S150 is performed.

[0045] In this embodiment, the second open hoops 21 are spaced apart and arranged in parallel, and multiple rows of longitudinal reinforcement welded short steel bars 22 are provided to control the distance between the upper and lower adjacent second open hoops 21.

[0046] Execute step S150: arrange the top reinforcement 102 and the third open hoop on the upper portion of the beam body 10 , and arrange the third open hoop and the first open hoop 11 correspondingly up and down.

[0047] The top rib 102 and the bottom rib 101 are arranged vertically and parallel to each other. The connection method of the third opening hoop will be described in detail below and will not be repeated here. Then, step S160 is executed.

[0048] Execute step S160: set the first reinforcement body 31 and the second reinforcement body 32 of the adjacent span beam 30 on the other side of the column 20, and connect the first reinforcement body 31 to the bottom reinforcement 101 and the second reinforcement body 32 to the top reinforcement 102 respectively.

[0049] The connection method can be either bend anchor or lap welding, which is selected according to specific needs and will not be described here. Then, step S170 is executed.

[0050] Execute step S170: After the column 20 is cast, the formwork 14 on both sides of the beam 10 is installed.

[0051] The formwork 14 comprises a face plate, primary purlins, and secondary purlins. The face plate is made of 15mm thick plywood, the primary purlins are made of φ48.3×3.0mm double steel tubes, and the secondary purlins are made of 50×100 wood purlins. The column 20 is cast first, followed by the steel-concrete beams positioned to one side of the column 20. This ensures a stable connection between the steel-concrete beams. During the casting of the column 20, the verticality of the formwork 14 is constantly corrected with a wire. Any deviation is immediately corrected to ensure the quality of the cast beam 10. Next, step S180 is executed.

[0052] Execute step S180: pour concrete inside the formwork 14 to form a steel-concrete beam.

[0053] Among them, before pouring concrete, the slump of concrete must be measured on site. The slump of concrete should be between 160 and 200 mm. After pouring, the concrete needs to be cured to ensure the quality of the beam body.

[0054] See Figure 2 and Figure 3 , Figure 2 shows a flow chart of step S110 of the present invention, Figure 3 The present invention provides a construction method for steel-concrete beams with dense longitudinal reinforcement, step S110 comprising:

[0055] Execute step S111: arrange the bottom form of the beam body 10, and set the first open hoop 11 reinforcement on the upper side of the bottom form.

[0056] Among them, the first opening hoop 11 rib and the bottom mold can be temporarily fixed by setting up frame ribs.

[0057] See Figure 4 and Figure 5 , Figure 4 The flow chart before step S130 of the present invention is shown. Figure 5 The present invention provides a construction method for steel-concrete beams with dense longitudinal reinforcement, which includes the following steps before step S130:

[0058] Execute step S1301: set reinforcement holes 121 on the two side flanges of the steel beam 12 located inside the column 20.

[0059] The two side wing panels include upper and lower wing panels, each with corresponding rebar holes 121. These holes 121 allow the rebar 22 within the column 20 to pass through. The holes 121 are designed to be slightly larger than the diameter of the rebar 22 within the column 20 to ensure smooth insertion of the rebar 22. This allows the section steel beam 12 to be positioned without cutting the vertical rebar 22 within the column 20, avoiding the need to cut and bypass the vertical rebar 22 within the column 20. This reduces the complexity and difficulty of construction and improves the overall stability of the building.

[0060] See Figure 6 and Figure 8 , Figure 6 shows a flow chart of step S130 of the present invention, Figure 8 The present invention provides a construction method for steel-concrete beams with dense longitudinal reinforcement, step S130 comprising:

[0061] Execute step S131 : dispose the steel beam 12 above the bottom reinforcement 101 , and dispose the steel beam 12 and the bottom reinforcement 101 in parallel.

[0062] One end of the steel beam 12 extends into the column 20 .

[0063] See Figure 7 and Figure 8 , Figure 7 The flowchart of step S150 of the present invention is shown. Figure 8 The present invention provides a construction method for steel-concrete beams with dense longitudinal reinforcement, step S150 comprising:

[0064] Execute step S151 : connect the first open hoop 11 and the third open hoop to form an annular hoop 13 .

[0065] The third opening hoop is disposed opposite to the first opening hoop 11 with the upper and lower openings facing each other, and the ends of the third opening hoop and the first opening hoop 11 overlap each other. The annular hoop 13 surrounds and limits the top rib 102 and the bottom rib 101.

[0066] See Figure 9 , shows another flow chart of step S150 of the present invention. The present invention provides a construction method for steel-concrete beams with dense longitudinal reinforcement, step S150 further comprising:

[0067] Execute step S152: set spacers between the top reinforcements 102 on the upper part of the beam body 10 to control the row spacing.

[0068] Among them, the spacer is supported by short steel bars 22.

[0069] See Figure 10 and Figure 11 , Figure 10 shows a flow chart of step S170 of the present invention, Figure 11 The present invention provides a construction method for steel-concrete beams with dense longitudinal reinforcement, step S170 comprising:

[0070] Execute step S171 : set a diagonal bracing structure 16 on the outer side of the template 14 .

[0071] The relatively arranged formwork 14 is fixed by tension bolts 15 , but since the tension bolts 15 cannot be used to penetrate the middle of the steel concrete, the formwork 14 is reinforced by diagonal bracing.

[0072] See Figure 12 , showing a flow chart of step S180 of the present invention. The present invention provides a construction method for steel-concrete beams with dense longitudinal reinforcement, step S180 comprising:

[0073] Execute step S181 : when pouring the portion below the upper flange of the steel beam 12 , input concrete from one side of the steel beam 12 .

[0074] When concrete is input from only one side, a vibrator is used to vibrate one side of the steel beam 12 to squeeze the concrete from the bottom of the steel beam 12 to the other side. The vibration operation is to use a small vibrating rod to perform high-frequency hammering and cooperate with knocking on the outer template 14.

[0075] See Figure 13 , shows another flow chart of step S180 of the present invention. The present invention provides a construction method for steel-concrete beams with dense longitudinal reinforcement, step S180 further comprising:

[0076] Execute step S182: When the height of the concrete exceeds the lower flange of the steel beam 12 and reaches the first mark height on the web of the steel beam 12, concrete is symmetrically input from both sides of the steel beam 12.

[0077] Two persons on both sides are required to vibrate symmetrically to ensure that the concrete at the bottom of the beam is dense, to prevent the formation of cavities, and to ensure the quality of the constructed beam body 10.

[0078] See Figure 14 , shows another flow chart of step S180 of the present invention. The present invention provides a construction method for steel-concrete beams with dense longitudinal reinforcement, step S180 further comprising:

[0079] Execute step S183 : when the height of the concrete reaches the second mark height above the upper wing plate of the steel beam 12 , input concrete from the middle position of the steel beam 12 .

[0080] The concrete on both sides of the web of the steel beam 12 is poured symmetrically and vibrated simultaneously. When it reaches a certain height of the upper flange, pouring is resumed from the middle of the beam span. The concrete thickness should be higher than the upper flange to exert a certain pressure on the underlying concrete. Vibration is initiated from the middle of the beam and gradually extended toward both ends until all bubbles under the upper flange are exhausted from the rebar holes 121 at both ends of the steel beam 12 and at the beam-column joint. Vent holes can also be reserved at the bottom or sides of the formwork 14.

[0081] The present invention has been described in detail above with reference to the accompanying drawings. A person skilled in the art may make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention. The scope of protection of the present invention shall be determined by the scope defined in the appended claims.

Claims

1. A construction method for steel-concrete beams with dense longitudinal reinforcement, characterized in that: The steps include: A first opening hoop located at the bottom of the beam body is installed on one side of the column body; Installing bottom reinforcement at the bottom of the beam body on the same side, and tying and fixing the bottom reinforcement to the first opening hoop; Passing the steel beam between the first opening hoops; A second open hoop is provided at a node between the column and the beam body, and the second open hoop is connected to an end of the steel beam; A top rib and a third open hoop are arranged on the upper part of the beam body, and the third open hoop is arranged correspondingly to the first open hoop up and down; A first reinforcement body and a second reinforcement body adjacent to the span beam are arranged on the other side of the column, and the first reinforcement body is connected to the bottom reinforcement, and the second reinforcement body is connected to the top reinforcement respectively; After the column is cast, the formwork on both sides of the beam is installed; Concrete is poured inside the template to form a steel-concrete beam.

2. A construction method for steel-concrete beams with dense longitudinal reinforcement according to claim 1, characterized in that: The first opening hoop installed on one side of the column and located at the bottom of the beam body comprises: A bottom formwork for the beam body is arranged, and the first opening stirrup is disposed on the upper side of the bottom formwork.

3. The construction method of a steel-concrete beam suitable for dense longitudinal reinforcement according to claim 1, characterized in that: The step of inserting the steel beam between the first opening hoops comprises: Reinforcement holes are arranged on the two side wing plates located inside the column on the steel beam.

4. The construction method of a steel-concrete beam suitable for dense longitudinal reinforcement according to claim 1, characterized in that: The step of inserting the steel beam between the first opening hoops comprises: The steel beam is arranged above the bottom reinforcement, and the steel beam is arranged parallel to the bottom reinforcement.

5. The construction method of steel-concrete beams with dense longitudinal reinforcement according to claim 1, characterized in that: The step of arranging a top rib and a third open hoop on the upper portion of the beam, and correspondingly connecting the third open hoop to the first open hoop comprises: The first open hoop and the third open hoop are connected to form an annular hoop.

6. The construction method of steel-concrete beams with dense longitudinal reinforcement according to claim 1, characterized in that: The step of arranging a top rib and a third open hoop on the upper portion of the beam body, and correspondingly connecting the third open hoop to the first open hoop further comprises: Spacers are arranged between the top ribs at the upper part of the beam body to control the row spacing.

7. The construction method of steel concrete beams with dense longitudinal reinforcement according to claim 1, characterized in that: After the column is cast, the templates on both sides of the beam are installed, including: A diagonal bracing structure is arranged on the outer side of the template.

8. The construction method of steel-concrete beams with dense longitudinal reinforcement according to claim 1, characterized in that: The pouring of concrete inside the template to form a steel-concrete beam comprises: When pouring the portion below the upper wing plate of the steel beam, the concrete is input from one side of the steel beam.

9. The construction method of steel-concrete beams with dense longitudinal reinforcement according to claim 1, characterized in that: The pouring of concrete inside the template to form a steel-concrete beam also includes: When the height of the concrete exceeds the lower wing plate of the steel beam and reaches the first mark height on the web of the steel beam, the concrete is symmetrically input from both sides of the steel beam.

10. A construction method for steel-concrete beams with dense longitudinal reinforcement according to claim 9, characterized in that: The pouring of concrete inside the template to form a steel-concrete beam also includes: When the height of the concrete reaches the second marked height above the upper wing plate of the steel beam, the concrete is input from the middle position of the steel beam.

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