Shear wall overlap transfer structure and its construction method

Abstract

The present invention discloses a shear wall lap conversion structure and a construction method thereof. The shear wall lap conversion structure comprises an upper core tube, a lower core tube and a lower inserted wall wing wall, wherein the area enclosed by the lower core tube is larger than the area enclosed by the upper core tube, the lower inserted wall wing wall is formed by the outer wall of the upper core tube extending downward from the bottom, the bottom of the lower inserted wall wing wall is located in the middle of the lower core tube, the side of the lower inserted wall wing wall is vertically connected to the inner wall of the lower core tube to transfer the load, and the upper core tube and the lower core tube are both straight wall structures. The shear wall lap conversion structure proposed by the present invention has a reasonable and reliable lap conversion force transmission path, and is a core tube retraction method with less impact on the building function.

Description

Technical Field

[0001] The present invention relates to the technical field of building structure engineering, and particularly relates to a shear wall lapping conversion structure and a construction method thereof. Background Art

[0002] Generally speaking, the required number of elevators in super high-rise buildings and the floor overturning moment generated under the action of horizontal loads will decrease with the increase of the floor height. Therefore, considering the different functional requirements of the upper and lower areas of super high-rise buildings and the gradually decreasing requirements for the elevator shaft space, it is a reasonable design that the core tube shear walls are gradually retracted inward along the height. However, this also brings adverse effects to the structural layout or structural forces, mainly including: under the action of vertical loads, additional shear forces and horizontal displacements will occur in the wall limbs; under the action of horizontal seismic forces, the sudden change in the lateral stiffness resistance will cause serious damage to the wall limbs, etc. Therefore, a reasonable core tube retraction method needs to meet both the building functions and make full use of structural materials.

[0003] There are several typical ways to retract the core tube shear walls in super high-rise buildings as follows: 1) Retraction by sectional division. The plane of the core tube shear walls adopts a nine-square grid layout, and the outer wall limbs are gradually reduced along the height, transitioning from a square to a cross-shaped plane. During the retraction process, the outer walls are basically symmetrically retracted, and the inner wall limbs remain unchanged. Since the corners of the core tube are opened, the structural stiffness is reduced to some extent, but the building usable space is greatly released, which better meets the building use functions. At the same time, the nine-square grid is only applicable to buildings with relatively close plane dimensions in two directions such as squares and circles, and is not applicable to rectangular and irregular plane buildings; 2) Oblique wall conversion retraction. The plane of the core tube changes from large to small, and the outer walls are retracted obliquely, and the vertical loads are converted through the oblique walls. The disadvantages of oblique wall conversion are as follows: 1. There are large horizontal thrusts at both the top and bottom of the oblique walls in oblique wall conversion, and complex structural configurations are required to balance the horizontal thrusts. 2. The oblique wall structure has a large stiffness, and it is extremely easy to form weak layers in the lower floors of the oblique walls, which is not conducive to the seismic resistance of the structure. 3. The construction of the core tube on the oblique wall floors is extremely difficult and the construction risks are relatively high; 3) Double-wing wall inward retraction. In order to avoid vertical conversion after the wall limbs are retracted, double-layer wing walls are arranged in the core tube. The first outer wall is cancelled in the high-rise area of the building to reduce the area of the core tube. Since the first outer wall is not set throughout the height, the second outer wall bears more vertical loads, resulting in a relatively large thickness of the second outer wall (sometimes the wall thickness is even larger than that of the first outer wall). Such an arrangement method can avoid conversion, but the structural efficiency is relatively low. The second outer wall is equivalent to the inner wall in the lower area. The large thickness of the inner wall increases the size of the core tube and reduces the space utilization rate of the building. In short, the traditional core tube shear wall conversion methods have disadvantages such as wall limb conversion, low structural efficiency, affecting the building functions of the lower structure, limited application scope, complex joint structures, unfavorable structural seismic resistance, and high construction risks. Therefore, it is necessary to study a new type of shear wall conversion structure. Summary of the Invention

[0004] The main object of the present invention is to provide a shear wall lapping conversion structure and its construction method, aiming to achieve the conversion without inclined walls and without affecting the building functions of the lower structure.

[0005] To achieve the above object, the present invention provides a shear wall lapping conversion structure, including an upper core tube, a lower core tube, and an inserted wall wing wall. Among them, the area of the region surrounded by the lower core tube is larger than the area of the region surrounded by the upper core tube. The inserted wall wing wall is formed by the outer wall of the upper core tube extending downward from the bottom. The bottom of the inserted wall wing wall is located in the middle of the lower core tube. The side surface of the inserted wall wing wall is vertically connected to the inner side wall of the lower core tube to transmit loads. Both the upper core tube and the lower core tube are straight wall structures.

[0006] Preferably, the upper core tube includes a first outer wall and a second outer wall arranged in parallel, and a first connecting wall connecting the first outer wall and the second outer wall. The lower part of the first connecting wall is the inserted wall wing wall. The lower core tube includes a third outer wall and a fourth outer wall arranged in parallel, and a second connecting wall connecting the third outer wall and the fourth outer wall.

[0007] Preferably, the first outer wall and the third outer wall are flush.

[0008] Preferably, the fourth outer wall is located outside the second outer wall.

[0009] Preferably, the inserted wall wing wall is connected to the second connecting wall.

[0010] Preferably, the inserted wall wing wall is perpendicular to the second connecting wall.

[0011] Preferably, the first connecting wall is perpendicular to the first outer wall, and the second connecting wall is perpendicular to the third outer wall.

[0012] Preferably, when both the first connecting wall and the second connecting wall are inner walls of the core tube, both sides of the second connecting wall are connected to the inserted wall wing wall; when both the first connecting wall and the second connecting wall are outer walls of the core tube, one side of the second connecting wall is connected to the inserted wall wing wall.

[0013] The present invention further provides a construction method based on the above shear wall lapping conversion structure. The lower core tube, the inserted wall wing wall, and the upper core tube are constructed layer by layer from bottom to top using climbing formwork. When constructing the inserted wall wing wall, supports are provided at the bottom of the inserted wall wing wall, and the bottom supports are removed when the concrete of all the inserted wall wing walls reaches the preset time.

[0014] The shear wall lapping conversion structure proposed by the present invention only needs to reassemble the mold according to the size after the core tube is retracted at the retraction position, which is more convenient than the traditional inclined wall construction. In other words, the traditional climbing formwork construction technology can be used by adopting lapping conversion, solving the difficulty of inclined wall construction. In addition, the shear wall lapping conversion structure of the present invention reduces the influence on the lower building functions and improves the utilization rate of structural members. The shear wall lapping conversion structure of the present invention has a simple structure, does not require the setting of complex joints, and does not generate weak layers, which is beneficial to the seismic resistance of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of a preferred embodiment of the shear wall lapping conversion structure of the present invention;

[0016] Figure 2 is an exploded structural diagram of a preferred embodiment of the shear wall lapping conversion structure of the present invention.

[0017] In the figure, 1 - first exterior wall, 2 - first connecting wall, 3 - second exterior wall, 4 - inserted lower wall wing wall, 5 - third exterior wall, 6 - second connecting wall, 7 - fourth exterior wall.

[0018] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the terms "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0021] The present invention proposes a shear wall lapping conversion structure.

[0022] Refer to Figure 1 and Figure 2, in this preferred embodiment, a shear wall lapping conversion structure includes an upper core tube, a lower core tube, and a downwardly inserted wall wing 4. Among them, the area of the region enclosed by the lower core tube is larger than the area of the region enclosed by the upper core tube. The downwardly inserted wall wing 4 is formed by the outer wall of the upper core tube extending downward from the bottom. The bottom of the downwardly inserted wall wing 4 is located in the middle of the lower core tube (that is, there is a certain distance between the bottom of the downwardly inserted wall wing 4 and the bottom of the lower core tube). The side surface of the downwardly inserted wall wing 4 is fixedly connected to the inner side wall of the lower core tube to transfer the load (the load transfer method is the shear resistance between the downwardly inserted wall wing 4 and the vertical wing wall). Both the upper core tube and the lower core tube are straight wall structures (a straight wall means that relative to an inclined wall, it is perpendicular to the ground).

[0023] In this embodiment, the bottom of the downwardly inserted wall wing 4 is located in the middle of the lower core tube. Therefore, this core tube retracting method has less impact on the building function.

[0024] Specifically, in this embodiment, taking Figure 1 the shown core tube structure as an example for illustration: The upper core tube includes a first outer wall 1 and a second outer wall 3 arranged in parallel, and a first connecting wall 2 connecting the first outer wall 1 and the second outer wall 3. The lower part of the first connecting wall 2 is the downwardly inserted wall wing 4. The lower core tube includes a third outer wall 5 and a fourth outer wall 7 arranged in parallel, and a second connecting wall 6 connecting the third outer wall 5 and the fourth outer wall 7. The first outer wall 1 and the third outer wall 5 are flushly arranged (the wall thicknesses of the two are the same). The fourth outer wall 7 is located outside the second outer wall 3. The downwardly inserted wall wing 4 is connected to the second connecting wall 6.

[0025] In this embodiment, the downwardly inserted wall wing 4 is vertically arranged with the second connecting wall 6. By adopting their vertical arrangement, on the one hand, the impact on the lower building function is reduced, and on the other hand, the utilization rate of the structural members is improved.

[0026] Specifically, in this embodiment, the first connecting wall 2 is vertically arranged with the first outer wall 1, and the second connecting wall 6 is vertically arranged with the third outer wall 5.

[0027] Specifically, the downwardly inserted wall wing 4 can be set to a height of 3 to 5 floors. The specific height is determined according to the force analysis. If the downwardly inserted wall wing 4 is too short, the connection strength between the upper core tube and the lower core tube will be insufficient. If the downwardly inserted wall wing 4 is too high, it will affect the lower building function.

[0028] Specifically, when both the first connecting wall 2 and the second connecting wall 6 are inner walls of the core tube (that is, when the two core tubes are adjacent, at this time it is Figure 1 and Figure 2In the first connecting wall 2 and the second connecting wall 6 are the common walls of the two core tubes), both sides of the second connecting wall 6 are connected to the inserted wall wing wall 4, that is to say, the second connecting wall 6 is inserted into the middle of the inserted wall wing wall 4, and the widths of the inserted wall wing walls 4 on both sides of the second connecting wall 6 can be set to be equal.

[0029] When both the first connecting wall 2 and the second connecting wall 6 are the outer walls of the core tube (that is to say, the walls in the core tube structure that are not adjacent to other core tubes), one side of the second connecting wall 6 is connected to the inserted wall wing wall 4 (that is to say, the second connecting wall 6 is located on one side of the inserted wall wing wall 4).

[0030] The second outer wall 3 of the upper core tube is the shear wall to be converted. The second outer wall 3 extends downward for several floors to form the inserted wall wing wall 4, forming a transition layer. All the loads of the second outer wall 3 are transmitted to the inserted wall wing wall 4 of the transition layer. The inserted wall wing wall 4 is vertically connected to the second connecting wall 6 of the lower core tube through the transition layer. At the intersection, the inserted wall wing wall 4 transmits the load to the second connecting wall 6. The vertical load is only transmitted at the intersection of the inserted wall wing wall 4 and the second connecting wall 6. There is an upward tension in the inserted wall wing wall 4 and a downward pressure in the second connecting wall 6. The upper second outer wall 3 transmits the load to the lower vertical inner wall through the inserted wall wing wall 4, thus completing the shear wall conversion.

[0031] For the shear wall lapping conversion structure proposed by the present invention, it only needs to reassemble the mold according to the size after the core tube is retracted at the core tube retraction place, which is more convenient than the traditional inclined wall construction. In other words, by using lapping conversion, the traditional climbing formwork construction technology can be used, solving the difficulty of inclined wall construction. In addition, the shear wall lapping conversion structure of the present invention reduces the influence on the lower building functions and improves the utilization rate of structural members. The shear wall lapping conversion structure of the present invention has a simple structure, does not need to set complex joints, and does not generate weak layers, which is beneficial to the seismic resistance of the structure.

[0032] The present invention further proposes a construction method for a shear wall lapping conversion structure.

[0033] In this preferred embodiment, a construction method based on the above shear wall lapping conversion structure uses a climbing formwork to construct the lower core tube, the inserted wall wing wall 4 and the upper core tube layer by layer from bottom to top. When constructing the inserted wall wing wall 4, supports are arranged at the bottom of the inserted wall wing wall 4, and the bottom supports are removed when the concrete of all the inserted wall wing walls 4 reaches the preset time (which can be set to 28 days).

[0034] It should be noted that since the wall of this shear wall lapping conversion structure is a vertical wall (i.e., a straight wall), traditional climbing formwork can be used for construction. In the prior art, the core tube of a super high-rise building needs to adopt a sloping wall to retract. The difficulties in the construction of the sloping wall conversion climbing formwork mainly include the following points: 1. The sloping wall makes it difficult to control the overall stability of the formwork and support system; 2. Since the sloping wall is relatively critical and has a horizontal thrust, the steel bars are often large in diameter and dense, and it is difficult to control the angle and binding quality of the steel bars; 3. The construction of the sloping wall is often at a height of 100 meters. It is difficult to disassemble, modify and reinstall the climbing formwork frame, and the risk is relatively high; 4. The sloping wall has a horizontal thrust. Generally, it is required that the horizontal beam and slab connected to the sloping wall be constructed synchronously with the floor slab to balance the horizontal thrust. However, due to the characteristics of the climbing formwork, it is impossible to achieve synchronous construction of the horizontal beam and slab. Temporary measures need to be taken at the sloping wall node to balance the horizontal force, and the measures are relatively difficult, which further increases the complexity of the node. Since the core tube structure of this application adopts a straight wall structure, traditional climbing formwork can be used for climbing formwork in the traditional climbing method, and reinforced concrete is poured from bottom to top to form the lower core tube, the inserted wall wing wall and the upper core tube, and the construction process is easy to operate.

[0035] The construction method proposed by the present invention has a simple and easy-to-operate construction process.

[0036] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made by using the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of the present invention by the same token.

Claims

1. A shear wall lap transfer structure, characterized in that: It includes an upper core tube, a lower core tube and a lower inserted wall wing wall, wherein the area of ​​the area enclosed by the lower core tube is larger than the area of ​​the area enclosed by the upper core tube, the lower inserted wall wing wall is formed by the outer wall of the upper core tube extending downward from the bottom, the bottom of the lower inserted wall wing wall is located in the middle of the lower core tube, the side of the lower inserted wall wing wall is vertically connected to the inner wall of the lower core tube to transfer the load, and the upper core tube and the lower core tube are both straight wall structures; when the first connecting wall and the second connecting wall are both inner walls of the core tube, both sides of the second connecting wall are connected to the lower inserted wall wing wall; when the first connecting wall and the second connecting wall are both outer walls of the core tube, one side of the second connecting wall is connected to the lower inserted wall wing wall.

2. The shear wall lap transfer structure according to claim 1, characterized in that: The upper core tube includes a first exterior wall and a second exterior wall arranged in parallel, and a first connecting wall connecting the first exterior wall and the second exterior wall, the lower part of the first connecting wall is a lower inserted wall wing wall, and the lower core tube includes a third exterior wall and a fourth exterior wall arranged in parallel, and a second connecting wall connecting the third exterior wall and the fourth exterior wall.

3. The shear wall lap transfer structure according to claim 2, characterized in that: The first exterior wall and the third exterior wall are arranged flush with each other.

4. The shear wall overlap conversion structure according to claim 2, characterized in that: The fourth outer wall is located outside the second outer wall.

5. The shear wall overlap conversion structure according to claim 2, characterized in that: The lower inserted wall wing wall is connected to the second connecting wall.

6. The shear wall overlap conversion structure according to claim 2, characterized in that: The downwardly inserted wall wing wall is vertically arranged to the second connecting wall.

7. The shear wall overlap conversion structure according to claim 2, characterized in that: The first connecting wall is vertically arranged with the first exterior wall, and the second connecting wall is vertically arranged with the third exterior wall.

8. A construction method for the shear wall overlap conversion structure according to any one of claims 1 to 7, characterized in that: The lower core tube, the lower inserted wall wing wall and the upper core tube are constructed layer by layer from bottom to top using climbing formwork. When constructing the lower inserted wall wing wall, supports are set at the bottom of the lower inserted wall wing wall. When the concrete of all the lower inserted wall wing walls reaches the preset time, the bottom supports are removed.

Images