Main body structure floor slab prestress support changing structure

Abstract

The utility model discloses a main body structure floor slab prestress support changing structure. The main body structure floor slab prestress support changing structure comprises an enclosure enclosing purlin, a supporting enclosing purlin, a pre-embedded steel plate, a partition plate, a jack, a concrete supporting plate and hanging bars. An enclosure purlin is fixedly installed on the inner side wall of the enclosure structure, a supporting purlin is fixedly installed on the outer side wall of the basement outer wall, embedded steel plates are laid on the inner side of the enclosure purlin and the outer side of the supporting purlin, a base of a jack is fixedly installed in the enclosure purlin, and the top of the jack makes close contact with the supporting purlin. A concrete supporting plate is fixedly installed on the outer side wall of the basement outer wall below the supporting enclosing purlins, the concrete supporting plate is horizontally arranged, the outer side face of the concrete supporting plate is in close contact with the inner side wall of the enclosure structure through a partition plate, and the enclosure structure is further fixedly connected with the enclosure enclosing purlins through hanging bars. Jacking force of the jacks can be independently applied or applied in a linkage mode through a plurality of jacks, the application range of the jacking force and the working face can be flexibly adjusted, and the application working condition is wide.

Description

Technical Field

[0001] The utility model relates to a floor slab prestressed support replacement structure in the technical field of foundation pit construction, in particular to a main structure floor slab prestressed support replacement structure. Background Art

[0002] With the continuous development of urban underground space, more and more deep and large foundation pits are excavated close to sensitive buildings. The foundation pit enclosure needs to take scientific and strict deformation control measures to reduce the impact of foundation pit construction on nearby existing sensitive buildings. The "enclosure structure + internal support" retaining structure system has the characteristics of large overall stiffness and small deformation, and can effectively control the deformation of the foundation pit and the surrounding soil layer. It is widely used in deep and large foundation pits with complex surrounding environments. The demolition process of this system generally removes the support from the bottom up, gradually releases the internal force of the support, and converts the internal force of the support to the basement structure system. Excessive deformation during the support removal process has a great impact on the safety of the surrounding environment. Therefore, effectively reducing the deformation of the replacement support is an important part of the foundation pit design. Designers often determine the size and layout spacing of the floor replacement support structure based on engineering experience. At the same time, they cannot actively control the internal force of the foundation pit enclosure structure and the support system, and it is difficult to obtain the best support effect at the optimal cost. Utility Model Content

[0003] The purpose of the utility model is to address the problem that the existing foundation pit floor slab replacement technology cannot actively control deformation to achieve the best support effect, and propose a main structure floor slab prestressed replacement support structure. The structure is composed of a protective purlin, purlin steel bars, supporting purlins, embedded steel plates, partitions, jacks, concrete support plates, and hanging bars. It is arranged at the depth of the floor slab inside the foundation pit at a certain interval. By applying the jacking force step by step, the axial force of the support to be removed is reduced, thereby reducing the stress release effect during the support removal process, and actively controlling the deformation generated in the support removal stage, effectively controlling the deformation generated by the removal of the foundation pit support. The utility model was developed under such a background and is applied in actual construction to produce good economic and social benefits.

[0004] In order to achieve the purpose, the technical solution provided by the utility model is:

[0005] The corresponding main structure floor prestressed replacement bracing structure is arranged between the enclosure structure and the basement outer wall at each floor slab, and is characterized in that the main structure floor prestressed replacement bracing structure includes enclosure purlins, and the inner wall of the enclosure structure close to the floor slab is fixedly installed with the enclosure purlin; it also includes support purlins, and the outer wall of the basement outer wall close to the floor slab is fixedly installed with the support purlin; it also includes embedded steel plates, and the inner side of the enclosure purlin and the outer side of the support purlin are both paved with embedded steel plates; it also includes a thousand A jack, the base of which is fixedly installed in the embedded steel plate of the enclosure purlin, and the top of the jack is in close contact with the embedded steel plate supporting the purlin; it also includes a concrete support plate, a concrete support plate is fixedly installed on the outer side wall of the basement outer wall under the supporting purlin, and the concrete support plate is arranged horizontally; it also includes a partition, the outer side surface of the concrete support plate is in close contact with the inner side wall of the enclosure structure through the partition; it also includes a hanger, the upper end of the hanger is fixedly connected to the enclosure structure, and the lower end of the hanger is fixedly connected to the enclosure purlin.

[0006] The enclosure structure is embedded with purlin steel bars, which are arranged in an array and are welded to the upper ends of the suspension bars.

[0007] The prestressed replacement support structures of the main structural floor slabs of each layer of the floor slab are arranged horizontally and at intervals.

[0008] The embedded steel plate has a size of 800mm×800mm and a thickness of 30mm.

[0009] The dimensions of the suspension rod are 25 mm in diameter and 200 mm in length.

[0010] There are multiple hanging rods, and the distance between two adjacent hanging rods is 1000mm~1200mm.

[0011] The jack is a through-type tensioning jack.

[0012] The maximum jacking stroke of the jack is not less than 200 mm.

[0013] The jack includes a pressurized box, a round-headed support rod and a disc top head; the pressurized box serves as the base of the jack, the bottom of the pressurized box is fixedly connected to the embedded steel plate of the enclosure structure, the top of the pressurized box is welded with a round-headed support rod, the round-headed support rod is hinged to the disc top head, and the disc top head is in close contact with the embedded steel plate supporting the surrounding purlin.

[0014] The embedded steel plate is an embedded square steel plate.

[0015] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0016] 1. The utility model arranges a prestressed floor slab replacement support structure on the inner side of the foundation pit, and applies the jacking force of the jack, so that the jack pushes into the retaining structure in advance through the purlin, reduces the horizontal component of the retaining structure at the support position of the foundation pit, reduces the axial force value of the horizontal support, actively compensates for the additional internal force and additional deformation of the retaining structure caused by the removal of the support, and effectively improves the safety of the removal of the support of the foundation pit.

[0017] 2. The replacement support structure is set at the depth of the foundation pit floor, which can reduce the internal force and deformation of the upper and lower supports at the same time, and reduce the risk when the support is removed.

[0018] 3. The replacement support structure is equipped with a bottom concrete support plate, which can effectively improve the placement accuracy of the jack and prevent the jack from falling and vertical displacement during operation. At the same time, the concrete support plate can be used as a workbench for basement exterior wall waterproofing operations in the later stage, which is convenient for construction.

[0019] 4. Purlins are set on both sides of the jack, so that the jacking force of the jack is evenly applied to the structures on both sides, which will not cause the concrete of the main structure to be crushed, and the jacking effect is good.

[0020] 5. The jacking force in the prestressed replacement support structure of the main structure floor can be applied independently or by several jacks in a coordinated manner. The application range of the jacking force and the working surface can be flexibly adjusted, and the application conditions are wide. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a top view of the prestressed replacement bracing structure of the main structure floor;

[0022] Figure 2 It is the side section view of the prestressed replacement bracing structure of the main structure floor;

[0023] Figure 3(a) is the large sample of the embedded steel plate Figure 1 ;

[0024] Figure 3(b) is the large sample of the embedded steel plate Figure 2 ;

[0025] Figure 4 It is the general drawing of the suspension reinforcement arrangement;

[0026] In the figure: 1. Guarding purlin; 1-1. Purlin reinforcement; 2. Supporting purlin; 3. Embedded steel plate; 4. Partition; 5. Jack; 6. Concrete support plate; 7. Guarding structure; 7-1. Main reinforcement of guarding structure; 8. Basement exterior wall; 9. Floor slab; 10. Suspension rod. DETAILED DESCRIPTION

[0027] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with embodiments. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0028] A corresponding main structure floor prestressed replacement support structure is arranged between the enclosure structure 7 and the basement outer wall 8 at each floor slab 9, such as Figure 1 and Figure 2 As shown, the prestressed replacement bracing structure of the main structure floor includes a protective purlin 1, a supporting purlin 2, an embedded steel plate 3, partitions 2-4, a jack 5, a concrete support plate 6 and a hanger 10; the inner wall of the protective structure 7 close to the floor slab 9 is fixedly installed with a protective purlin 1, the cross-sectional size of the protective purlin is 600mm high × 750mm wide, and the length is the full coverage of the target control area; the purlin steel bar size is 22mm in diameter, and the length is 2 / 3 of the purlin protective purlin / supporting purlin width; the purlin steel bar is connected to the embedded steel plate at an adjacent spacing of 200mm, and the connection method is drilling and plug welding; the outer wall of the basement outer wall 8 close to the floor slab 9 is fixedly installed with a supporting purlin 2, and the inner side of the protective purlin 1 and the outer side of the supporting purlin 2 are both paved with embedded steel plates 3, the size of which is 600mm×600mm and the thickness of which is 30mm. The base of the jack 5 is fixedly installed in the embedded steel plate 3 of the enclosure purlin 1, and the top of the jack 5 is in close contact with the embedded steel plate 3 of the supporting purlin 2, which is used to support the basement outer wall 8 at the floor slab 9; the outer wall of the basement outer wall 8 under the supporting purlin 2 is fixedly installed with a concrete support plate 6, that is, the inner surface of the concrete support plate 6 is rigidly connected to the outer wall of the basement outer wall 8, the concrete support plate 6 is arranged horizontally, and the outer side surface of the concrete support plate 6 is spaced apart from the inner wall of the enclosure structure 7 and is in close contact with the inner wall of the enclosure structure 7 through the partitions 2-4. The thickness of the concrete support plate is 250mm, and the length is the full coverage of the target control area. One end of the concrete support plate is rigidly connected to the outer wall of the basement, and the other end is disconnected from the enclosure structure, and the disconnection spacing is 50mm; the upper and lower sides of the concrete support plate are both equipped with third-grade steel bars with a diameter of 16mm and a spacing of 200mm; the partition material can be made of wooden formwork or plastic plates or rubber plates of equal thickness. The hanger bar adopts 22mm diameter third-grade steel bar. The upper end of the hanger bar 10 is welded to the purlin steel bar 1-1 of the enclosure structure 7, and the welding length is not less than 110mm, so that the upper end of the hanger bar 10 is fixedly connected to the enclosure structure 7, and the lower end of the hanger bar 10 is vertically anchored into the enclosure purlin 1 and welded to the purlin steel bar 2-1-1, and the anchoring length is not less than 400mm, so that the lower end of the hanger bar 10 is fixedly connected to the enclosure purlin 1.

[0029] As shown in FIG. 3 ( a ) and FIG. 3 ( b ), purlin reinforcement bars 1 - 1 are embedded in the enclosure structure 7 . The purlin reinforcement bars 1 - 1 are arranged in an array and are welded to the upper ends of the hanger bars 10 .

[0030] The prestressed replacement bracing structures of the main structure floor slabs of each floor slab 9 are arranged horizontally and at intervals, that is, the prestressed replacement bracing structures of the main structure floor slabs of each layer are located in the same horizontal plane.

[0031] The embedded steel plate 3 is an embedded square steel plate with a size of 800 mm×800 mm and a thickness of 30 mm.

[0032] like Figure 4 As shown, a plurality of suspension rods 10 are provided, and the spacing between two adjacent suspension rods 10 is 1000 mm to 1200 mm. The dimensions of the suspension rod 10 are 25 mm in diameter and 200 mm in length.

[0033] The jack 5 adopts a through-type tension jack 5, and the maximum jacking stroke is not less than 200mm. Alternatively, the jack 5 includes a pressurizing box 1-2-1, a round-head support rod 1-2-2 and a disc top head 1-2-3; the pressurizing box 1-2-1 serves as the base of the bottom plate jack 51-2, the bottom of the pressurizing box 1-2-1 is fixedly connected to the embedded steel plate 3 of the enclosure structure 7, the top of the pressurizing box 1-2-1 is welded with a round-head support rod 1-2-2, the round-head support rod 1-2-2 is hinged to the disc top head 1-2-3, and the disc top head 1-2-3 is in close contact with the embedded steel plate 3 supporting the purlin 2.

[0034] The above embodiments are used to illustrate the present invention rather than to limit the present invention. Any modification and change made to the present invention within the spirit of the present invention and the protection scope of the claims shall fall within the protection scope of the present invention.

Claims

1. A main structure floor prestressed support replacement structure, wherein a corresponding main structure floor prestressed support replacement structure is arranged between a retaining structure (7) and a basement outer wall (8) at each floor (9), characterized in that: The main structure floor prestressed replacement support structure comprises a protective purlin (1), the protective purlin (1) being fixedly installed on the inner wall of the protective structure (7) close to the floor (9); a supporting purlin (2), the supporting purlin (2) being fixedly installed on the outer wall of the basement outer wall (8) close to the floor (9); an embedded steel plate (3), the embedded steel plate (3) being laid on the inner side of the protective purlin (1) and the outer side of the supporting purlin (2); and a jack (5), the base of the jack (5) being fixedly installed in the embedded steel plate (3) of the protective purlin (1), and the jack (5) being fixedly installed in the embedded steel plate (3) of the protective purlin (1). The top of the basement wall (5) is in close contact with the embedded steel plate (3) supporting the purlin (2); it also includes a concrete support plate (6), the outer wall of the basement outer wall (8) under the supporting purlin (2) is fixedly mounted with the concrete support plate (6), and the concrete support plate (6) is arranged horizontally; it also includes a partition plate (2-4), the outer side surface of the concrete support plate (6) is in close contact with the inner wall of the enclosure structure (7) through the partition plate (2-4); it also includes a hanger bar (10), the upper end of the hanger bar (10) is fixedly connected to the enclosure structure (7), and the lower end of the hanger bar (10) is fixedly connected to the enclosure purlin (1).

2. A main structure floor prestressed support replacement structure according to claim 1, characterized in that: Purlin reinforcement bars (1-1) are embedded in the enclosure structure (7), the purlin reinforcement bars (1-1) are arranged in an array, and the purlin reinforcement bars (1-1) are welded to the upper ends of the hanger bars (10).

3. The main structure floor prestressed support replacement structure according to claim 1 is characterized in that: The prestressed replacement bracing structures of the main structural floor slabs of each floor slab (9) are arranged horizontally and at intervals.

4. The main structure floor prestressed support replacement structure according to claim 1 is characterized in that: The embedded steel plate (3) has a size of 800 mm×800 mm and a thickness of 30 mm.

5. The main structure floor prestressed support replacement structure according to claim 1 is characterized in that: The dimensions of the suspension rod (10) are 25 mm in diameter and 200 mm in length.

6. The main structure floor prestressed support replacement structure according to claim 1 is characterized in that: A plurality of the suspension bars (10) are provided, and the distance between two adjacent suspension bars (10) is 1000 mm to 1200 mm.

7. The main structure floor prestressed support replacement structure according to claim 1 is characterized in that: The jack (5) is a through-type tensioning jack (5).

8. The main structure floor prestressed support replacement structure according to claim 1 is characterized in that: The maximum jacking stroke of the jack (5) is not less than 200 mm.

9. The main structure floor prestressed support replacement structure according to claim 1, characterized in that: The jack (5) comprises a pressurizing box, a round-head support rod and a disc top head; the pressurizing box serves as the base of the jack (5); the bottom of the pressurizing box is fixedly connected to the embedded steel plate (3) of the enclosure structure (7); the top of the pressurizing box is welded with a round-head support rod, the round-head support rod is hinged to the disc top head, and the disc top head is in close contact with the embedded steel plate (3) supporting the surrounding purlin (2).

10. The main structure floor prestressed support replacement structure according to claim 1, characterized in that: The embedded steel plate (3) is an embedded square steel plate.

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