Construction method of high cantilever concrete structure

Abstract

This application discloses a construction method for a high-level cantilevered concrete structure. First, several longitudinal steel beams are anchored to the floor slab. Then, wire mesh is laid on the longitudinal steel beams, followed by the installation of guardrails. Next, two anti-tension beams are anchored to each wall. Then, multiple transverse steel beams are suspended between the two anti-tension beams, ensuring that each transverse steel beam is below and abuts against the longitudinal steel beams. Next, inclined holes are made in the wall of the lower floor for the passage of diagonal bracing beams. The diagonal bracing beams are passed through these holes and connected to the longitudinal steel beams, then fixed to the wall. Afterward, the wire mesh is removed, and bottom and side formwork are laid on the longitudinal steel beams. Reinforcing steel is then tied, and concrete is poured to form the cantilevered concrete structure. This application eliminates the need for high-altitude suspended operations on the building's exterior walls to complete the cantilevered structure construction, improving both construction efficiency and safety.

Description

Technical Field

[0001] This application relates to the technical field of cantilever structure construction, and in particular to a construction method for a high-level cantilever concrete structure. Background Technology

[0002] With the rapid and high-quality development of cities, people have increasingly higher demands for the sophistication and usability of buildings, and more and more high-end hotels and entertainment venues are adopting designs that include cantilevered swimming pools.

[0003] Existing cantilevered swimming pools typically use reinforced concrete structures as their foundations. During construction, steel beams need to be anchored to the floor slab, with one end of the beam cantilevered out of the slab to serve as the supporting foundation for the cantilevered pool structure. Since cantilevered pools occupy a larger area than ordinary balconies, diagonal bracing is required between the lower surface of the steel beams and the wall to provide support for the beams. Then, a formwork frame is erected on the upper surface of the steel beams and reinforcing steel is tied. Finally, concrete is poured to form the cantilever structure, followed by interior finishing work.

[0004] However, when constructing the diagonal bracing system, workers need to perform high-altitude suspended operations on the exterior wall, which not only results in low construction efficiency but also poses significant construction risks. Summary of the Invention

[0005] To improve the construction efficiency and safety of high-level cantilever concrete structures, this application provides a construction method for high-level cantilever concrete structures.

[0006] This application provides a construction method for a high-level cantilevered concrete structure, which adopts the following technical solution:

[0007] A construction method for a high-level cantilevered concrete structure includes the following steps:

[0008] S1. Anchor several longitudinal steel beams to the floor slab;

[0009] S2. Lay wire mesh on several longitudinal steel beams;

[0010] S3. Construct guardrails on the longitudinal steel beams;

[0011] S4. An anti-tension beam is anchored to the walls on both sides of several longitudinal steel beams. The anti-tension beam is located above the longitudinal steel beam and parallel to the longitudinal steel beam. Then, multiple transverse steel beams are suspended between the two anti-tension beams, so that each transverse steel beam is located below the longitudinal steel beam and spans multiple longitudinal steel beams and abuts against the longitudinal steel beam.

[0012] S5. Construct the diagonal bracing beam: Make an inclined hole in the wall of the lower floor for the diagonal bracing beam to pass through. Pass the diagonal bracing beam through the inclined hole until one end of the diagonal bracing beam abuts against the longitudinal steel beam. Then fix the diagonal bracing beam to the wall.

[0013] S6. Remove the wire mesh and lay the bottom and side formwork on several longitudinal steel beams. Then tie the reinforcing bars in the cavity formed by the side formwork and the bottom plate, and then pour concrete to form a cantilevered concrete structure.

[0014] By adopting the above technical solutions, and laying wire mesh on several longitudinal steel beams and constructing protective railings, subsequent construction is not only facilitated, but construction workers are also effectively protected, significantly improving construction safety. By constructing anti-tension beams and transverse steel beams, the anti-tension beams, transverse steel beams, and walls form an anti-tension structure, providing excellent support for the longitudinal steel beams and significantly enhancing their load-bearing capacity. Simultaneously, by opening holes in the walls of the lower floors and then constructing diagonal bracing beams inside the floors, the load-bearing capacity of the longitudinal steel beams is further enhanced, and the construction of the diagonal bracing beams can be completed indoors, significantly improving construction efficiency and reducing construction risks.

[0015] Preferably, in step S1, when anchoring the longitudinal steel beam, a first through hole is first opened in the floor slab for the fixing beam to pass through, one end of the fixing beam is passed through the first through hole and welded to the longitudinal steel beam, and then the fixing beam is anchored to the lower surface of the floor slab.

[0016] By adopting the above technical solution, the fixed beam and the floor slab form a reverse tension structure, which is beneficial to enhance the load-bearing capacity of the longitudinal steel beam.

[0017] Preferably, in step S4, when constructing the anti-pull beam, a second through hole is opened in the wall for the anti-pull beam to pass through. Then, an anti-pull plate is welded to one end of the anti-pull beam. Then, the end of the anti-pull beam away from the anti-pull plate is passed from the interior through the second through hole to the exterior. The anti-pull beam is moved until the anti-pull plate abuts against the wall. Then, the anti-pull plate is anchored to the wall.

[0018] By adopting the above technical solution, it is beneficial to enhance the connection strength and stability between the anti-tension beam and the wall, and the connection node between the anti-tension beam and the wall will not become loose.

[0019] Preferably, in step S5, before drilling the inclined hole in the wall of the lower floor, the wall is marked with a line according to the position of the fixed beam, and then the drilling position of the inclined hole is located in combination with the length of the inclined brace beam, so that the inclined brace beam can be connected to the corresponding longitudinal steel beam after passing through the inclined hole.

[0020] By adopting the above technical solution, the horizontal coordinate of the inclined hole on the wall can be located by tracing the position of the fixed beam. Since the length of the inclined beam is known, the vertical coordinate of the inclined hole on the wall can be calculated according to the Pythagorean theorem, thereby realizing the positioning of the inclined hole drilling position. Then, the inclined hole is drilled on the wall according to the inclination angle of the inclined beam, ensuring that the inclined beam can abut against the corresponding longitudinal steel beam after passing through the inclined hole, avoiding the situation of inaccurate opening of the inclined hole. This not only helps to improve construction efficiency, but also effectively reduces the degree of damage to the wall, so as to facilitate subsequent repairs.

[0021] Preferably, the diagonal bracing beam includes a fixed tube with two end faces perpendicular to each other. The side wall of the fixed tube is provided with multiple inserts, which are parallel to the end face of the fixed tube near the wall. The inserts are slidably inserted into the fixed tube, and a control component for controlling the movement of the inserts is provided inside the fixed tube.

[0022] By adopting the above technical solution, during the construction of the diagonal bracing beam, after one end of the beam passes through the inclined hole, the control component moves the insert to extend it out of the fixing pipe, ensuring that the insert abuts against the outer wall surface. Then, the fixing pipe is fixed to the wall. Because the insert abuts against the outer wall surface, there is no risk of the diagonal bracing beam becoming unstable due to loosening of the connection between the fixing pipe and the wall. This ensures that the diagonal bracing beam provides stable and strong support for the longitudinal steel beam.

[0023] Preferably, the control component includes a screw threadedly connected to a fixed pipe, a movable rod rotatably connected to one end of the screw extending into the fixed pipe, and multiple connecting rods hinged to the peripheral wall of the movable rod, each connecting rod corresponding to an insert bar, with the end of the connecting rod away from the movable rod hinged to the insert bar.

[0024] By adopting the above technical solution, rotating the screw can drive the movable rod to move along the axial direction. The movement of the movable rod drives the connecting rod to move, and the movement of the connecting rod drives the insert to move relative to the fixed tube, so that the insert can slide freely relative to the fixed tube.

[0025] Preferably, the fixed tube includes a fixed section and a movable section, the control component is disposed in the fixed section, the fixed section and the movable section are movably connected, and when the length of the insert extending out of the fixed section is half of its own length and the movable rod abuts against the movable section, the length of the fixed tube is a reference length for calculating the position of the inclined hole.

[0026] By adopting the above technical solution, due to construction errors in drilling inclined holes and processing errors in each diagonal brace, there is a possibility that a gap may exist between the insert and the outer wall surface after the insert extends out of the fixed pipe. To eliminate this possibility, the fixed pipe is divided into a fixed section and a movable section. When the control component controls the insert to extend out of the fixed section, the fixed section is pulled back to make the insert abut against the outer wall surface. Then, the screw is rotated to push the movable rod forward. The forward movement of the movable rod pushes the movable section forward, making the movable section abut against the longitudinal steel beam. Then, the movable section is welded to the longitudinal steel beam or connected with fasteners, and the fixed section is fixed to the wall. This ensures that the insert abuts against the outer wall surface, thereby providing stable support for the longitudinal steel beam.

[0027] Preferably, the anti-tension beam has a through groove along its length, the through groove passing through the upper and lower surfaces of the anti-tension beam, and multiple hangers are slidably connected in the through groove. The upper end of each hanger is threaded and threaded with an adjusting nut, and the transverse steel beam is suspended between two hangers.

[0028] By adopting the above technical solution, the lifting rod can move along the length of the counter-bracing beam, which facilitates the hoisting of the transverse steel beam. After the transverse steel beam is hoisted into place, the adjusting nut is tightened to make the transverse steel beam abut against the longitudinal steel beam, thereby providing stable support for the longitudinal steel beam and significantly improving the load-bearing capacity of the longitudinal steel beam.

[0029] In summary, this application includes at least one of the following beneficial technical effects:

[0030] 1. This application forms a counter-tension structure by using counter-tension beams and transverse steel beams, which can effectively increase the load-bearing capacity of the longitudinal steel beams, thereby improving the safety during construction;

[0031] 2. This application installs the diagonal bracing beams by drilling holes in the walls of the lower floors. Compared with high-altitude operations on exterior walls, this method is not only more efficient but also significantly improves construction safety.

[0032] 3. This application ensures that the insert strip is slidably inserted into the fixed pipe and that the insert strip is pressed against the outer wall surface of the wall by adjusting the length of the inclined fixed pipe, thereby ensuring that the inclined bracing beam provides stable support for the longitudinal steel beam. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of the cantilever structure in this application. Figure 1 ;

[0034] Figure 2 This is a schematic diagram of the overall structure of the cantilever structure in this application. Figure 2 ;

[0035] Figure 3This is a schematic diagram of the internal structure of the diagonal bracing beam in this application.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Floor slab; 2. Longitudinal steel beam; 3. Fixed beam; 4. Tension plate; 5. Guardrail; 6. Wall; 7. Anti-tension beam; 8. Transverse steel beam; 9. Anti-tension plate; 10. Hanger rod; 11. Through groove; 12. Adjusting nut; 13. Limiting plate; 14. Groove; 15. Diagonal bracing beam; 151. Fixed pipe; 1511. Fixed section; 1512. Moving section; 152. Insert strip; 153. Control component; 1531. Screw rod; 1532. Moving rod; 1533. Connecting rod. Detailed Implementation

[0038] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0039] This application discloses a construction method for a high-level cantilevered concrete structure, including the following steps:

[0040] S1. Anchor several longitudinal steel beams 2 on the floor slab 1, and make the several longitudinal steel beams 2 evenly spaced along the length of the cantilever structure.

[0041] Specifically, refer to Figure 1 and Figure 2 The longitudinal steel beam 2 is positioned on the floor slab 1 so that one end of the longitudinal steel beam 2 protrudes from the floor slab 1 to serve as the supporting foundation for the cantilevered concrete structure. Then, according to the position of the longitudinal steel beam 2, a first through hole is made in the floor slab 1 for the fixed beam 3 to pass through. One end of the fixed beam 3 is fixedly connected to a tension plate 4, and the longitudinal steel beam 2 has a hole through which the fixed beam 3 passes. The end of the fixed beam 3 away from the tension plate 4 is passed through the first through hole and welded to the longitudinal steel beam 2. The tension plate 4 is then anchored to the lower surface of the floor slab 1. Multiple sets of anchor rods are then used to anchor the longitudinal steel beam 2 to the floor slab 1. The fixed beam 3 and the tension plate 4, combined with the floor slab 1, form a counter-tension structure, which not only enhances the connection strength between the longitudinal steel beam 2 and the floor slab 1 but also enhances the load-bearing capacity of the longitudinal steel beam 2.

[0042] S2. Lay wire mesh (not shown in the figure) on several longitudinal steel beams 2. Laying wire mesh facilitates subsequent construction.

[0043] S3. Reference Figure 1 The guardrail 5 is then installed on the longitudinal steel beam 2. The guardrail 5 can be purchased ready-made or welded on-site using steel bars. The guardrail 5 is then directly welded to the longitudinal steel beam 2.

[0044] S4, Reference Figure 1 and Figure 2A counter-tension beam 7 is anchored to each of the two side walls 6 of several longitudinal steel beams 2. The counter-tension beam 7 is located above the longitudinal steel beams 2 and parallel to them. Then, multiple transverse steel beams 8 are suspended between the two counter-tension beams 7, so that each transverse steel beam 8 is located below the longitudinal steel beams 2 and spans multiple longitudinal steel beams 2 and abuts against them.

[0045] When anchoring the anti-pull beam 7, a second through hole is opened on the wall 6 for the anti-pull beam 7 to pass through. Then, an anti-pull plate 9 is welded to one end of the anti-pull beam 7. Then, the other end of the anti-pull beam 7 is passed from the interior through the second through hole to the exterior. Then, the anti-pull plate 9 is anchored to the inner wall surface of the wall 6. The length of the segment of the anti-pull beam 7 located outside is longer than the length of the cantilever segment of the longitudinal steel beam 2.

[0046] Each anti-tension beam 7 can be detachably connected to multiple hangers 10. A through groove 11 is formed along the length of the anti-tension beam 7, penetrating both the upper and lower surfaces. The width of the through groove 11 matches the diameter of the hanger 10. The upper end of the hanger 10 passes vertically through the through groove 11. The upper end of the hanger 10 is threaded with an adjusting nut 12, and the lower end of the hanger 10 is fixedly connected to a limiting plate 13. The area of ​​the limiting plate 13 is larger than the cross-sectional area of ​​the hanger 10.

[0047] The transverse steel beam 8 is set between two hangers 10 located on two anti-tension beams 7. Both ends of the transverse steel beam 8 are recessed with U-shaped grooves 14, and the hangers 10 are slidably inserted into the grooves 14.

[0048] When hoisting the horizontal steel beam 8, overlap it onto the guardrail 5, then horizontally insert the lifting rod 10 into the groove 14, and then pass the upper end of the lifting rod 10 through the through slot 11 and connect it to the adjusting nut 12. Next, push the horizontal steel beam 8 away from the wall 6, so that the horizontal steel beam 8 automatically slides off the guardrail 5 and abuts against the limiting plate 13. Then move the lifting rod 10 so that it moves closer to the wall 6. When the lifting rod 10 is in place, tighten the adjusting nut 12 to make the horizontal steel beam 8 abut against the longitudinal steel beam 2, thus completing the hoisting of the first horizontal steel beam 8. Repeat the above steps to complete the hoisting of each horizontal steel beam 8. The entire hoisting process can be completed within the enclosure of the guardrail 5, ensuring high construction safety.

[0049] S5. Construct the diagonal bracing beam 15: Refer to... Figure 2 and Figure 3An inclined hole is made in the wall 6 of the lower floor for the diagonal bracing beam 15 to pass through. When drilling the inclined hole, the horizontal coordinate of the inclined hole on the wall 6 is determined by drawing lines based on the installation positions of the fixed beam 3 and the tension plate 4. Then, the vertical coordinate of the inclined hole on the wall 6 is calculated using the Pythagorean theorem, thus determining the drilling position of the inclined hole. Drilling then begins, ensuring that the inclination of the completed inclined hole matches the inclination of the diagonal bracing beam 15. One end of the diagonal bracing beam 15 is then passed through the inclined hole from the interior until it abuts against the longitudinal steel beam 2. The diagonal bracing beam 15 is then fixed to the longitudinal steel beam 2, and finally, the diagonal bracing beam 15 is fixed to the wall 6, thus completing the installation of the diagonal bracing beam 15.

[0050] Specifically, the diagonal bracing beam 15 includes a fixed pipe 151, the longitudinal section of which is trapezoidal, and the two end faces of the fixed pipe 151 are perpendicular to each other. The fixed pipe 151 includes a fixed section 1511 and a movable section 1512, which are slidably connected to the fixed section 1511. Multiple inserts 152 are slidably inserted into the side wall of the fixed section 1511, and the axes of the inserts 152 are parallel to the end face of the fixed section 1511 away from the movable section 1512. In this embodiment, two inserts 152 are provided; in other embodiments, there may be one, three, four, etc. A control component 153 for controlling the synchronous movement of the multiple inserts 152 is provided within the fixed section 1511.

[0051] The control assembly 153 includes a screw 1531 threadedly connected to a fixed section 1511, with the screw 1531 and the fixed section 1511 coaxially arranged. One end of the screw 1531 extending into the fixed section 1511 is rotatably connected to a movable rod 1532 via a bearing, with the movable rod 1532 coaxially arranged with the screw 1531. Multiple connecting rods 1533 are hinged to the side wall of the movable rod 1532, each corresponding to a corresponding insert 152. The end of the connecting rod 1533 away from the movable rod 1532 is hinged to the corresponding insert 152, and the end of the connecting rod 1533 away from the movable rod 1532 is inclined in a direction away from the insert 152. The included angle between the connecting rod 1533 and the movable rod 1532 is always an acute angle. When the length of the insert 152 extending out of the fixed section 1511 is half of its own length and the movable rod 1532 abuts against the movable section 1512, the length of the fixed tube 151 is the reference length for calculating the longitudinal coordinate of the inclined hole.

[0052] When installing the diagonal bracing beam 15, the movable section 1512 is passed through the inclined hole from the interior. Then, the fixed tube 151 is moved until the insert 152 is located outside the wall. Then, the screw 1531 is rotated to push the movable rod 1532 forward. During the forward movement of the movable rod 1532, the connecting rod 1533 is moved, thereby pushing the insert 152 out of the fixed section 1511. Since the fixed tube 151 is inclined upward during installation, the movable section 1512 will always be in contact with the movable rod 1532, so that the movable rod 1532 is also pushed forward during the movement, making the overall length of the fixed tube 151 longer. After the insert 152 extends out of the fixed section 1511, the fixed section 1511 is pulled back to make the insert 152 abut against the outer wall surface of the wall 6. Then, the screw 1531 is rotated again, so that the insert 152 continues to extend out of the fixed section 1511, while the movable section 1512 continues to move forward until the longitudinal steel beam 2 of the movable section 1512 abuts against it. Then, the movable section 1512 is locked to the longitudinal steel beam 2 using fasteners or fixed to the longitudinal steel beam 2 by welding. In this embodiment, the movable section 1512 and the longitudinal steel beam 2 are locked using fasteners. The locking element is a common bolt. The longitudinal steel beam 2 has a slotted through hole for the bolt to pass through, and the movable section 1512 has a threaded hole for the bolt to mate with. Finally, the fixed section 1511 is fixed to the wall 6 to complete the installation of the diagonal brace beam 15.

[0053] By setting the insert 152 and adjusting the length of the fixing pipe 151, it is ensured that the insert 152 can be tightly pressed against the outer wall surface of the wall 6, thereby ensuring that the diagonal bracing beam 15 provides stable support for the longitudinal steel beam 2. Moreover, the entire construction process can be completed indoors and within the space enclosed by the guardrail 5, eliminating the need for construction personnel to perform suspended high-altitude operations on the exterior wall of the building, which not only significantly improves construction efficiency but also significantly improves construction safety.

[0054] S6. Remove the wire mesh and simultaneously lay the bottom and side formwork on several longitudinal steel beams 2. Then, tie the reinforcing bars in the cavity formed by the side formwork and the bottom plate, and then pour concrete to form a cantilevered concrete structure. During the concrete pouring, the concrete needs to be vibrated to ensure that the concrete fills the cavity densely, and then attention should be paid to curing.

[0055] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A construction method for a high-level cantilevered concrete structure, characterized in that: Includes the following steps: S1. Anchor several longitudinal steel beams (2) on the floor slab (1); S2. Lay wire mesh on several longitudinal steel beams (2); S3. Construct guardrails (5) on the longitudinal steel beam (2); S4. An anti-pull beam (7) is anchored on both sides of the wall (6) of several longitudinal steel beams (2). The anti-pull beam (7) is located above the longitudinal steel beam (2) and parallel to the longitudinal steel beam (2). Then, multiple transverse steel beams (8) are suspended between the two anti-pull beams (7), so that each transverse steel beam (8) is located below the longitudinal steel beam (2) and spans multiple longitudinal steel beams (2) and abuts against the longitudinal steel beam (2). S5. Construction of the diagonal bracing beam (15): Open an inclined hole in the wall (6) of the lower floor for the diagonal bracing beam (15) to pass through. Pass the diagonal bracing beam (15) through the inclined hole until one end of the diagonal bracing beam (15) abuts against the longitudinal steel beam (2). Then fix the diagonal bracing beam (15) to the wall (6). S6. Remove the wire mesh and lay the bottom formwork and side formwork on several longitudinal steel beams (2). Then tie the reinforcing bars in the cavity formed by the side formwork and the bottom plate, and then pour concrete to form a cantilevered concrete structure.

2. The construction method for a high-level cantilevered concrete structure according to claim 1, characterized in that: In step S1, when anchoring the longitudinal steel beam (2), a first through hole is first opened on the floor slab (1) for the fixed beam (3) to pass through. One end of the fixed beam (3) is passed through the first through hole and welded to the longitudinal steel beam (2). Then the fixed beam (3) is anchored to the lower surface of the floor slab (1).

3. The construction method for a high-level cantilevered concrete structure according to claim 1, characterized in that: In step S4, when constructing the anti-pull beam (7), a second through hole is opened on the wall (6) for the anti-pull beam (7) to pass through. Then, an anti-pull plate (9) is welded to one end of the anti-pull beam (7). Then, the end of the anti-pull beam (7) away from the anti-pull plate (9) is passed from the interior through the second through hole to the exterior. The anti-pull beam (7) is moved until the anti-pull plate (9) abuts against the wall (6). Then, the anti-pull plate (9) is anchored to the wall (6).

4. The construction method for a high-level cantilevered concrete structure according to claim 2, characterized in that: In step S5, before drilling the inclined hole in the wall (6) of the lower floor, the wall (6) is marked according to the position of the fixed beam (3), and then the drilling position of the inclined hole is located in combination with the length of the inclined bracing beam (15), so that the inclined bracing beam (15) can be connected to the corresponding longitudinal steel beam (2) after passing through the inclined hole.

5. The construction method for a high-level cantilevered concrete structure according to claim 4, characterized in that: The diagonal bracing beam (15) includes a fixed tube (151), the two end faces of the fixed tube (151) are perpendicular to each other, and the side wall of the fixed tube (151) is provided with multiple inserts (152). The inserts (152) are parallel to the end face of the fixed tube (151) near the wall (6), and the inserts (152) are slidably inserted into the fixed tube (151). The fixed tube (151) is provided with a control component (153) for controlling the movement of the inserts (152).

6. The construction method for a high-level cantilevered concrete structure according to claim 5, characterized in that: The control component (153) includes a screw (1531) threadedly connected to a fixed tube (151). One end of the screw (1531) extending into the fixed tube (151) is rotatably connected to a movable rod (1532). The peripheral wall of the movable rod (1532) is hinged with multiple connecting rods (1533). Each connecting rod (1533) corresponds to an insert (152). The end of the connecting rod (1533) away from the movable rod (1532) is hinged to the insert (152).

7. The construction method for a high-level cantilevered concrete structure according to claim 6, characterized in that: The fixed tube (151) includes a fixed section (1511) and a movable section (1512). The control component (153) is disposed in the fixed section (1511). The fixed section (1511) and the movable section (1512) are movably connected. When the insert (152) extends out of the fixed section (1511) by half its own length and the movable rod (1532) abuts against the movable section (1512), the length of the fixed tube (151) is the reference length for calculating the opening position of the inclined hole.

8. The construction method for a high-level cantilevered concrete structure according to claim 1, characterized in that: The anti-tension beam (7) has a through groove (11) along its length. The through groove (11) passes through the upper and lower surfaces of the anti-tension beam (7). Multiple hangers (10) are slidably connected in the through groove (11). The upper end of each hanger (10) is threaded and threaded with an adjusting nut (12). The transverse steel beam (8) is suspended between two hangers (10).

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