Support-free construction method for treating differential settlement

Abstract

The invention provides a support-free construction method for treating differential settlement, which comprises the following steps: connecting secondary beams at the differential settlement part and the end part of a longitudinal frame beam, arranging a reserved plate reinforcing steel bar and a gap of post-pouring concrete between the secondary beams and a transverse frame beam, and arranging a connecting plate and an anti-shearing plate which are connected by a bolt penetrating through an oblong hole at the end of the longitudinal frame beam. And when the settlement difference of the differential settlement part exceeds an acceptable limit value, the elevation of the beam end of the longitudinal frame beam is adjusted by lifting or lowering a piston of the hollow jack and matching with the tightness of a nut. And the adjustment action is repeated, and after the estimated follow-up settlement difference of the differential settlement part meets the design requirement, beam end joint and gap inner plate concrete is poured. The invention provides a support-free construction method for treating differential settlement, a support frame is not arranged in the construction period, the building construction cost can be reduced, the construction safety risk can be reduced, horizontal traffic obstacles in floors are reduced, and the working efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the field of design and construction of concrete structures of construction projects, and in particular relates to a support-free construction method for handling differential settlement. Background Art

[0002] In many construction projects, the main building is high-rise and the podium is multi-story, or the basement outline is larger than the above-ground building outline. Accordingly, areas with height differences will have the problem of differential settlement. Excessive settlement differences may cause cracking of structural components and affect structural safety. To solve the problem of differential settlement, on the one hand, the design will reduce differential settlement by optimizing the foundation design scheme on both sides of the height difference area through calculation. On the other hand, settlement post-casting strips will be set at the differential settlement areas. The structures on both sides of the post-casting strips will settle separately during construction. When it is estimated that the subsequent settlement difference will not cause damage to the structure, the post-casting strips will be closed.

[0003] Setting up post-cast settlement strips is an effective method for addressing differential settlement. However, these strips cannot be closed until the higher main structure is completed and the infill wall is built. Before closing, both structures must be supported by scaffolding. Long-term scaffolding installations present several unavoidable drawbacks: first, the scaffolding is expensive and uneconomical; second, as a temporary construction facility, long-term use inevitably poses safety risks; and third, the scaffolding is often installed along the perimeter of the higher main structure, obstructing horizontal traffic during construction. These issues have made construction companies reluctant to install post-cast settlement strips, yet they are forced to do so. These issues have long-standing concerns within the engineering community and urgently require resolution. Summary of the Invention

[0004] To address these issues, the present invention provides a support-free construction method for addressing differential settlement. This method eliminates the need for a support system and instead increases the structure's adaptability to differential settlement by installing nodes with adjustable beam end elevations at the ends of frame beams in areas of significant differential settlement. As foundation settlement progresses on both sides of the structure, the beam end elevations at these nodes are adjusted in real time based on monitoring data, relieving stress on structural components caused by differential settlement and preventing them from exceeding their load-bearing capacity and causing damage.

[0005] The present invention provides a support-free construction method for treating differential settlement, which comprises:

[0006] (1) When there is a large differential settlement in the structure, a node structure with adjustable beam end elevation should be used;

[0007] (2) When there is a large differential settlement of the structure, settlement observations should be conducted on the structures on both sides of the differential settlement area.

[0008] (3) When the settlement difference at the differential settlement site exceeds the acceptable limit, the beam end elevation at the node site should be adjusted to release the internal stress of the component caused by the differential settlement;

[0009] (4) Settlement observation should be carried out continuously and the beam end elevation should be adjusted in a timely manner;

[0010] (5) When it is estimated that the subsequent settlement difference will not cause structural damage, concrete can be poured at the node. The beneficial effects of the present invention are as follows:

[0011] 1. The support-free construction method for handling differential settlement does not require the provision of support structures under the structural members on both sides of the post-settlement grouting zone, thereby reducing the construction cost of the project.

[0012] 2. The support-free construction method for handling differential settlement reduces construction safety risks.

[0013] 3. The support-free construction method for handling differential settlement reduces horizontal traffic obstacles within the floor and improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the planar layout of the method provided by the present invention.

[0015] Figure 2 This is a schematic elevation diagram of a node of the method provided by the present invention. DETAILED DESCRIPTION

[0016] The present invention will be described in further detail below so that those skilled in the art can implement the invention with reference to the description.

[0017] The present invention discloses a support-free construction method for handling differential settlement, the method comprising:

[0018] (1) The plane layout of the differential settlement area is as follows Figure 1 As shown, the node designed by the present invention is provided between the frame column 1 and the longitudinal frame beam 2. Figure 2 As shown;

[0019] (2) A connecting secondary beam 4 is provided at the end of the longitudinal frame beam 2, and a gap 5 is left between the connecting secondary beam 4 and the transverse frame beam 3, and a plate reinforcement is reserved in the gap 5;

[0020] (3) The node is connected to the frame column 1 through an embedded part consisting of anchor bars 8 and embedded plates 9;

[0021] (4) The node is connected to the longitudinal frame beam 2 by a shear plate 12 with side welded studs 13;

[0022] (5) The longitudinal reinforcement 6 at the top of the beam and the longitudinal reinforcement 7 at the bottom of the beam between the longitudinal frame beam 2 and the frame column 1 are reserved as per the design;

[0023] (6) The connection plate 10, the support plate 11 and the embedded plate 9 are welded, and the spacing is greater than the thickness of the shear plate 12;

[0024] (7) The shear plate 12 is placed between the connecting plate 10 and the supporting plate 11;

[0025] (8) Bolts 15 are passed through the pre-drilled holes on the shear plate 12 and the oblong holes 16 on the connecting plate 10, and nuts 14 are tightened to connect the connecting plate 10 to the shear plate 12;

[0026] (9) According to the settlement observation data of the differential settlement part, when the settlement difference at both ends of the longitudinal frame beam 2 exceeds the acceptable limit, the beam end elevation is adjusted;

[0027] (10) The beam end elevation adjustment arrangement is as follows: a force transmission block 17 is placed on the top surface of the connecting plate 10 and the supporting plate 11, a hollow jack 18 is placed on the force transmission block 17, a tie rod 20 pre-welded on the top surface of the shear plate 12 passes through the hollow jack 18, and a pin 21 passes through the pin hole 19 at the top of the tie rod 20;

[0028] (11) The method for adjusting the beam end elevation is as follows: lift the piston of the hollow jack 18 to apply force to the pull rod 20, loosen the nut 14, raise or lower the piston of the hollow jack 18 to adjust the beam end elevation of the longitudinal frame beam 2 to the required height, tighten the nut 14, and then withdraw the hollow jack 18 from operation and remove it;

[0029] (12) Repeat (9);

[0030] (13) After the estimated subsequent settlement difference of the differential settlement area meets the design requirements, concrete is poured in the nodes and gaps 5.

[0031] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to specific details.

Claims

1. A support-free construction method for handling differential settlement, characterized in that: include: ① A connecting secondary beam (4) is provided at the end of the longitudinal frame beam (2), a gap (5) is left between the connecting secondary beam (4) and the transverse frame beam (3), and plate reinforcement is reserved in the gap (5); ② The embedded parts consisting of anchor bars (8) and embedded plates (9) are connected to the frame columns (1): ③ The shear plate (12) with side welded studs (13) is embedded in the longitudinal frame beam (2); ④ The connecting plate (10), the supporting plate (11) and the embedded plate (9) are welded, and the spacing is greater than the thickness of the shear plate (12); 5. The shear plate (12) is placed between the connecting plate (10) and the supporting plate (11); ⑥ Bolts (15) are passed through the pre-drilled holes on the shear plate (12) and the oblong holes (16) on the connecting plate (10), and then nuts (14) are tightened to connect the connecting plate (10) to the shear plate (12); ⑦ The pull rod (20) pre-welded on the top surface of the shear plate (12) passes through the hollow jack (18), and the pin (21) passes through the pin (19) hole on the top of the pull rod (20).

2. The support-free construction method for handling differential settlement according to claim 1, wherein: ① Lift the piston of the hollow jack (18) to apply force to the pull rod (20), loosen the nut (14), raise or lower the piston of the hollow jack (18) to adjust the elevation of the end of the longitudinal frame beam (2) to the required height, and then tighten the nut (14); ② After the estimated subsequent settlement difference of the differential settlement area meets the design requirements, pour concrete in the nodes and gaps (5).

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