A construction method for dense longitudinal ribbed steel reinforced concrete beam

Abstract

The application relates to a construction method suitable for a dense longitudinal ribbed steel reinforced concrete beam, which comprises the following steps: installing a first open hoop at the bottom of a beam body on one side of a column; installing a bottom rib at the bottom of the beam body and binding the bottom rib with the first open hoop; arranging a steel beam between the first open hoop; arranging a second open hoop at a column-beam joint and connecting the second open hoop to the end of the steel beam; arranging a top rib and a third open hoop at the upper part of the beam body; arranging a first rib body and a second rib body of an adjacent span beam on the other side of the column; installing a formwork on both sides of the beam body after the column is poured; and pouring concrete in the formwork to form the steel reinforced concrete beam. The steel rib of the steel reinforced concrete beam is bound first, and then the steel rib of the adjacent span beam is bound, so that the construction sequence is optimized, the conflict between the steel beam and the adjacent span beam can be effectively avoided, the steel beam and the column are effectively connected through the second open hoop, the stable connection of the beam-column joint is realized, and the construction efficiency and quality are improved.

Description

Technical Field

[0001] This invention relates to the field of civil engineering, and specifically to a construction method for steel-concrete composite beams with dense longitudinal reinforcement. Background Technology

[0002] With the development of the construction industry, steel-concrete composite beams and columns are used in the structural design of buildings with high seismic fortification requirements. Due to their high strength, high rigidity and good seismic performance, steel-concrete composite beams are widely used in high-rise buildings, large bridges, underground structures and other projects.

[0003] However, the construction of steel-concrete composite beams presents significant challenges due to their multiple stirrups and dense longitudinal reinforcement, making stirrup insertion and beam installation difficult. Existing solutions primarily involve altering the construction sequence, installing the steel-concrete composite beams first, followed by adjacent spans, to avoid conflicts between the longitudinal reinforcement of the steel beams and adjacent spans. Additionally, the installation of the steel beams is achieved by cutting and bypassing the column (wall) vertical reinforcement. Furthermore, precast steel-concrete composite beams are sometimes employed to reduce construction complexity.

[0004] While existing technologies have addressed some of the challenges in constructing steel-concrete composite beams, several issues and drawbacks remain. First, current methods require cutting and bypassing the vertical reinforcement bars of columns (walls), increasing complexity and difficulty, and potentially affecting the overall stability of the building. Second, existing methods do not consider the reinforcement characteristics of the steel-concrete composite beams and adjacent beams, potentially leading to an unreasonable construction sequence and impacting efficiency and quality. Finally, current methods do not address the integration of the steel-concrete composite beams with columns (walls), which may affect the overall strength and seismic performance of the building. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects of the prior art and provide a construction method for steel-concrete composite beams with dense longitudinal reinforcement. This method solves the problems of dense longitudinal reinforcement, difficulty in inserting stirrups into the beam, embedding the steel beam inside the columns (walls) at both ends, the core stirrups of the column (wall) joints hindering the installation of the steel beam, and the fact that the anchorage of the longitudinal reinforcement of adjacent span beams often conflicts with the steel beam.

[0006] The technical solution to achieve the above objective is: a construction method for steel-concrete composite beams with dense longitudinal reinforcement, comprising the following steps: installing a first open-end hoop at the bottom of the beam on one side of the column; installing a bottom reinforcement bar at the bottom of the beam on the same side, and binding the bottom reinforcement bar to the first open-end hoop; passing the steel beam through the first open-end hoop; setting a second open-end hoop at the node between the column and the beam, and connecting the second open-end hoop to the end of the steel beam; setting a top reinforcement bar and a third open-end hoop on the upper part of the beam, and setting the third open-end hoop vertically corresponding to the first open-end hoop; setting a first reinforcement bar and a second reinforcement bar of the adjacent span beam on the other side of the column, respectively connecting the first reinforcement bar to the bottom reinforcement bar and the second reinforcement bar to the top reinforcement bar; after the column is poured, installing formwork on both sides of the beam; pouring concrete inside the formwork to form a steel-concrete composite beam.

[0007] In the construction method of steel-concrete composite beams with dense longitudinal reinforcement, the construction sequence is optimized by prioritizing the binding of the steel-concrete composite beam reinforcement and then binding the reinforcement of the adjacent span beams. This effectively avoids conflicts between the steel beams and the adjacent span beams, improves construction efficiency and quality, and achieves effective connection between the steel beams and columns through the second open hoop, thus realizing a stable connection of the beam-column joint and improving construction quality.

[0008] A further improvement of the construction method of the present invention for steel-concrete composite beams with dense longitudinal reinforcement is that the installation of the first open hoop at the bottom of the beam on one side of the column includes: arranging the bottom formwork of the beam and setting the first open hoop on the upper side of the bottom formwork.

[0009] A further improvement of the construction method of the present invention for steel-concrete composite beams with dense longitudinal reinforcement is that, before passing the steel beam between the first open hoops, the method includes: setting through holes for reinforcement on the two side flanges of the steel beam located in the column body.

[0010] A further improvement of the construction method of the present invention for steel-concrete composite beams with dense longitudinal reinforcement is that the step of passing the steel beam through the first open hoop includes: placing the steel beam above the bottom reinforcement and setting the steel beam parallel to the bottom reinforcement.

[0011] A further improvement of the construction method of the present invention for steel-concrete composite beams with dense longitudinal reinforcement is that the step of setting a top reinforcement and a third open hoop at the top of the beam, and connecting the third open hoop to the first open hoop, includes connecting the first open hoop to the third open hoop to form a ring hoop.

[0012] A further improvement of the construction method of the present invention for steel-concrete composite beams with dense longitudinal reinforcement is that the step of setting a top reinforcement and a third open hoop on the upper part of the beam body, and connecting the third open hoop to the first open hoop, includes 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 the present invention for steel-concrete composite beams with dense longitudinal reinforcement is that, after the column is poured, the installation of the formwork on both sides of the beam includes: setting up a diagonal bracing structure on the outside of the formwork.

[0014] A further improvement of the construction method of the present invention for steel-concrete composite beams with dense longitudinal reinforcement is that the step of pouring concrete inside the template to form the steel-concrete composite beam includes: when pouring the portion below the upper flange of the steel beam, the concrete is introduced from one side of the steel beam.

[0015] A further improvement of the construction method of the present invention for steel-concrete composite beams with dense longitudinal reinforcement is that the step of pouring concrete inside the template to form the steel-concrete composite beam further includes: when the height of the concrete exceeds the lower flange of the steel beam and reaches the first marked height on the web of the steel beam, the concrete is symmetrically poured from both sides of the steel beam.

[0016] A further improvement of the construction method of the present invention for steel-concrete composite beams with dense longitudinal reinforcement is that the step of pouring concrete inside the template to form the steel-concrete composite beam further includes: when the height of the concrete reaches the second mark height above the upper flange of the steel beam, the concrete is input from the middle position of the steel beam. Attached Figure Description

[0017] Figure 1 This is a schematic flowchart illustrating a construction method for steel-concrete composite beams with dense longitudinal reinforcement according to the present invention.

[0018] Figure 2 This is a flowchart illustrating step S110 of the present invention.

[0019] Figure 3 This is a schematic diagram of the structure of the first open hoop of the present invention.

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

[0021] Figure 5 This is a schematic diagram of the through-beam hole structure of the present invention.

[0022] Figure 6 This is a flowchart illustrating step S130 of the present invention.

[0023] Figure 7 This is a flowchart illustrating step S150 of the present invention.

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

[0025] Figure 9 This is another schematic diagram of step S150 of the present invention.

[0026] Figure 10 This is a flowchart illustrating step S170 of the present invention.

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

[0028] Figure 12 This is a flowchart illustrating step S180 of the present invention.

[0029] Figure 13 This is another flowchart illustrating step S180 of the present invention.

[0030] Figure 14 This is another flowchart illustrating step S180 of the present invention.

[0031] In the diagram: 10. Beam; 101. Bottom reinforcement; 102. Top reinforcement; 11. First open stirrup; 12. Steel beam; 121. Through-reinforcement hole; 13. Ring stirrup; 14. Formwork; 15. Tie bolt; 16. Diagonal bracing structure; 20. Column; 21. Second open stirrup; 22. Reinforcing bar; 23. Temporary support stirrup; 30. Adjacent span beam; 31. First reinforcement; 32. Second reinforcement. Detailed Implementation

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

[0033] See Figure 1 This document illustrates a flowchart of a construction method for steel-concrete composite beams with dense longitudinal reinforcement, according to the present invention. The present invention provides a construction method for steel-concrete composite beams with dense longitudinal reinforcement, comprising the following steps:

[0034] Step S110: Install the first open hoop 11 located at the bottom of the beam 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 that of the beam 10. There are no specific restrictions on the size and number of the first opening hoop 11. Next, step S120 is executed.

[0037] Step S120: Install the bottom reinforcement bar 101 located at the bottom of the beam 10 on the same side, and tie the bottom reinforcement bar 101 to the first open hoop 11 for fixation.

[0038] Among them, the bottom reinforcement 101 is arranged according to the extension direction of the beam 10, and the bottom reinforcement 101 is arranged on the upper side of the first open hoop 11. Then, step S130 is executed.

[0039] Execution step S130: Insert the steel beam 12 between the first open hoops 11.

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

[0041] In this embodiment, before installing the steel beam 12, temporary supporting steel bars 22 can be installed inside the column 20 to support the end of the steel beam 12. Then, step S140 is executed.

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

[0043] Among them, the second opening hoop 21 is fitted around the outer periphery of the longitudinal reinforcement set inside the column 20. It is necessary to determine whether the second opening hoop 21 can be directly welded to the web plate of the steel beam 12. If it cannot be directly welded, a welding lap plate needs to be added to the web plate at the end when the steel beam 12 is made.

[0044] In this embodiment, before setting the second opening hoop 21, the temporary support hoop 23 is used to limit the steel bar 22 inside the column 20, and then step S150 is executed.

[0045] In this embodiment, the second open hoops 21 are arranged vertically at intervals and in parallel, and a multi-row longitudinal reinforcement welded short steel bar 22 support is provided to control the distance between adjacent upper and lower second open hoops 21.

[0046] Step S150: Set the top reinforcement 102 and the third open hoop on the upper part of the beam 10, and set the third open hoop and the first open hoop 11 in a corresponding vertical position.

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

[0048] Step S160: On the other side of the column 20, the first reinforcement 31 and the second reinforcement 32 of the adjacent span beam 30 are set, and the first reinforcement 31 is connected to the bottom reinforcement 101 and the second reinforcement 32 is connected to the top reinforcement 102.

[0049] The connection method can be either a bent anchor or a lap weld, depending on the specific requirements, which will not be elaborated here. Next, proceed to step S170.

[0050] Step S170: After the column 20 is poured, install the formwork 14 on both sides of the beam 10.

[0051] The template 14 includes a panel, main joists, and secondary joists. The panel is made of 15mm thick plywood, the main joists are made of φ48.3×3.0mm double steel pipes, and the secondary joists are made of 50×100mm wooden joists. The column 20 is poured first, followed by the steel-concrete beam positioned on one side of the column 20. This ensures the stability of the steel-concrete beam connection. During the pouring of the column 20, the verticality of the template 14 is constantly checked using a plumb line, and any deviations are immediately corrected to ensure the quality of the poured beam 10. Next, step S180 is executed.

[0052] Step S180: Pour concrete inside the formwork 14 to form a steel-concrete composite beam.

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

[0054] See Figure 2 and Figure 3 , Figure 2 A flowchart of step S110 of the present invention is shown. Figure 3 A schematic diagram of the first open hoop of the present invention is shown. The present invention provides a construction method for steel-concrete composite beams with dense longitudinal reinforcement, step S110 including:

[0055] Step S111: Arrange the bottom formwork of the beam 10 and set the first open stirrup 11 on the upper side of the bottom formwork.

[0056] The first opening hoop 11 can be temporarily fixed to the bottom formwork by setting up support bars.

[0057] See Figure 4 and Figure 5 , Figure 4 This shows a flowchart before step S130 of the present invention. Figure 5 A schematic diagram of the through-hole structure of the present invention is shown. The present invention provides a construction method for steel-concrete composite beams with dense longitudinal reinforcement, the method preceding step S130 including:

[0058] Step S1301: Provide through-reinforcement holes 121 on the two side flanges of the steel beam 12 located inside the column 20.

[0059] The two side flanges include an upper flange and a lower flange. The through holes 121 on the upper and lower flanges are corresponding vertically, allowing the reinforcing bars 22 inside the column 20 to pass through. The size of the through holes 121 should be slightly larger than the diameter of the reinforcing bars 22 inside the column 20 to ensure that the reinforcing bars 22 can be smoothly inserted. This allows the steel beam 12 to be positioned without cutting the vertical reinforcing bars 22 inside the column 20, avoiding the step of cutting and bypassing the vertical reinforcing bars 22 inside the column 20, reducing the complexity and difficulty of construction, and also improving the overall stability of the building.

[0060] See Figure 6 and Figure 8 , Figure 6 A flowchart of step S130 of the present invention is shown. Figure 8 The diagram shows the structural schematics of the column, beam, and adjacent span beam of the present invention. The present invention provides a construction method for steel-concrete composite beams with dense longitudinal reinforcement, step S130 including:

[0061] Step S131: Place the steel beam 12 above the bottom reinforcement 101 and set the steel beam 12 parallel to the bottom reinforcement 101.

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

[0063] See Figure 7 and Figure 8 , Figure 7 A flowchart of step S150 of the present invention is shown. Figure 8 The diagram shows the structural schematics of the column, beam, and adjacent span beam of the present invention. The present invention provides a construction method for steel-concrete composite beams with dense longitudinal reinforcement, step S150 including:

[0064] Step S151: Connect the first open hoop 11 and the third open hoop to form an annular hoop 13.

[0065] The third open hoop and the first open hoop 11 are arranged with their upper and lower openings facing each other, and the ends of the third open hoop and the first open hoop 11 overlap each other. The annular hoop 13 surrounds and limits the top reinforcement 102 and the bottom reinforcement 101.

[0066] See Figure 9 This illustrates another flowchart of step S150 of the present invention. The present invention provides a construction method for steel-concrete composite beams with dense longitudinal reinforcement, wherein step S150 further includes:

[0067] Step S152: Install spacers between the top reinforcement bars 102 at the top of the beam 10 to control the spacing.

[0068] The spacer is supported by 22 short steel bars.

[0069] See Figure 10 and Figure 11 , Figure 10 A flowchart of step S170 of the present invention is shown. Figure 11 A structural schematic diagram of the template and diagonal bracing structure of the present invention is shown. The present invention provides a construction method for steel-concrete composite beams with dense longitudinal reinforcement, step S170 including:

[0070] Step S171: Install diagonal bracing structure 16 on the outside of template 14.

[0071] The template 14, which is set opposite to each other, is fixed by tie bolts 15. However, since it is not possible to use tie bolts 15 to drill through the middle of the steel-concrete structure, diagonal bracing is used to reinforce the template 14.

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

[0073] Step S181: When pouring the portion below the upper flange of the steel beam 12, concrete is poured in from one side of the steel beam 12.

[0074] When concrete is poured from only one side, a vibrator is used to vibrate on one side of the steel beam 12, squeezing the concrete from the bottom of the steel beam 12 to the other side. The vibration operation involves using a small vibrator to hammer at a high frequency and simultaneously striking the outer formwork 14.

[0075] See Figure 13 This illustrates another flowchart of step S180 of the present invention. The present invention provides a construction method for steel-concrete composite beams with dense longitudinal reinforcement, wherein step S180 further includes:

[0076] 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 poured in from both sides of the steel beam 12.

[0077] This requires two people on each side to vibrate the concrete symmetrically to ensure that the concrete at the bottom of the beam is dense, prevent cavities, and guarantee the quality of the beam 10 during construction.

[0078] See Figure 14 This illustrates another flowchart of step S180 of the present invention. The present invention provides a construction method for steel-concrete composite beams with dense longitudinal reinforcement, wherein step S180 further includes:

[0079] Step S183: When the height of the concrete reaches the second mark height above the upper flange of the steel beam 12, pour concrete from the middle position of the steel beam 12.

[0080] In this process, the concrete on both sides of the web of the steel beam 12 is poured symmetrically from both sides simultaneously and vibrated symmetrically. When the concrete reaches a certain height on the upper flange, the pouring begins again from the middle of the beam span. The thickness of the concrete pour should be higher than that on the upper flange, so that it exerts a certain pressure on the lower layer of concrete. Vibration begins from the middle of the beam and gradually extends to both ends until all air bubbles under the upper flange are discharged from the reinforcing bar holes 121 at both ends of the steel beam 12 and at the beam-column joint. At the same time, venting holes can be reserved at the bottom or side of the formwork 14.

[0081] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. Those skilled in the art can 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, and the scope of protection of the present invention shall be defined by the appended claims.

Claims

1. A construction method for steel-concrete composite beams with dense longitudinal reinforcement, characterized in that, Includes the following steps: Install the first open hoop at the bottom of the beam on one side of the column; Install bottom reinforcement bars located at the bottom of the beam on the same side, and tie and fix the bottom reinforcement bars to the first open hoop; The steel beam is inserted between the first open hoops; A second open hoop is installed at the node between the column and the beam, and the second open hoop is connected to the end of the steel beam; A top reinforcement bar and a third open hoop are provided on the upper part of the beam, and the third open hoop is arranged vertically and vertically corresponding to the first open hoop. On the other side of the column, a first reinforcement and a second reinforcement of the adjacent span beam are provided, with the first reinforcement connected to the bottom reinforcement and the second reinforcement connected to the top reinforcement. After the column is poured, install the formwork on both sides of the beam. Concrete is poured inside the template to form a steel-concrete composite beam.

2. The construction method for steel-concrete composite beams with dense longitudinal reinforcement according to claim 1, characterized in that, The installation of the first open hoop located at the bottom of the beam on one side of the column includes: Arrange the bottom formwork of the beam, and set the first opening hoop on the upper side of the bottom formwork.

3. The construction method for steel-concrete composite beams with dense longitudinal reinforcement according to claim 1, characterized in that, The process of threading the steel beam between the first open clamps includes: Through-reinforcement holes are provided on the two side flanges of the steel beam located inside the column.

4. The construction method for steel-concrete composite beams with dense longitudinal reinforcement according to claim 1, characterized in that, The step of inserting the steel beam between the first open clamps includes: The steel beam is placed above the bottom reinforcement bar, and the steel beam is arranged parallel to the bottom reinforcement bar.

5. A construction method for steel-concrete composite beams with dense longitudinal reinforcement according to claim 1, characterized in that, The step of setting a top reinforcement bar and a third open hoop on the upper part of the beam, and connecting the third open hoop to the first open hoop, includes: The first open hoop is connected to the third open hoop to form a ring hoop.

6. A construction method for steel-concrete composite beams with dense longitudinal reinforcement according to claim 1, characterized in that, The step of setting a top reinforcement bar and a third open hoop on the upper part of the beam, and connecting the third open hoop to the first open hoop, further includes: Spacers are installed between the top reinforcing bars at the top of the beam to control the spacing between them.

7. A construction method for steel-concrete composite beams with dense longitudinal reinforcement according to claim 1, characterized in that, The installation of formwork on both sides of the beam after the column is poured includes: A diagonal bracing structure is provided on the outside of the template.

8. A construction method for steel-concrete composite beams with dense longitudinal reinforcement according to claim 1, characterized in that, The process of pouring concrete inside the template to form a steel-concrete composite beam includes: When pouring the portion below the upper flange of the steel beam, the concrete is poured in from one side of the steel beam.

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

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

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