Modularized pit-in-pit template anti-floating device

Abstract

The utility model relates to a modularized anti-floating device for a pit-in-pit formwork, which belongs to the technical field of steel structures and comprises a concrete base, pile foundations are arranged on two sides of the lower end of the concrete base, a counter-force foundation section assembly is arranged at the upper end of the concrete base, an inverted U-shaped hanging ring is arranged at the upper end of the counter-force foundation section assembly, and the inverted U-shaped hanging ring is connected with the pile foundations. Pull rods are arranged between the two ends of the upper portion of the counter-force foundation section assembly and the pile foundation. The counter-force foundation section assembly comprises a stand column, a connecting end plate is arranged between the upper end of the stand column and the U-shaped hanging ring, and a plurality of round steel hanging lugs which are annularly distributed and connected with the pull rod are arranged on the outer circle of the upper portion of the stand column. The structure has the characteristics of compact structure, convenience in construction and good structural stability. The pit formwork has enough strength, rigidity, integrity and stability and enough anti-floating counter-force, the pit formwork is effectively prevented from inclining, floating, deforming and falling apart and collapsing, and therefore the section size, the forming quality and the construction safety are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of steel structure technology, specifically to a modular anti-buoyancy device for pit-in-pit formwork. Background Technology

[0002] In modern high-rise building design, making full use of underground space by designing basements is almost inevitable. To ensure that the settlement of high-rise buildings meets the code requirements, pile foundations are also very common. And these basements almost without exception are designed with pits within pits, such as sump pits and elevator pits. These pits are mostly not very large in area, but there are many of them.

[0003] The inner surface of the pit is mostly vertical, while the outer surface of the pit wall is generally a slope formed by the foundation. These pits within pits are all equipped with corresponding steel reinforcement frames according to the structural design requirements. The formwork is set according to the design requirements of the well cross-sectional space and concrete is poured to form the pits. The formwork for these pits within pits consists of two layers, inner and outer. The bottom part of the outer formwork consists of a concrete pad under the bottom slab, while the outer formwork of the four sloping surfaces is a brick masonry formwork.

[0004] For internal formwork construction, a rectangular wooden box is constructed using template timber nailed together, with several small holes in the bottom plane and an open top surface. Anti-buoyancy method:

[0005] (1) Stack stacks of plywood or rolls of coiled steel bars on top of the wooden box to provide weight and prevent buoyancy.

[0006] (2) Place water bags in the space enclosed by the side formwork and bottom formwork and fill them with water. After the pouring is completed, remove the water.

[0007] (3) Set up a screw rod, with the upper end connected to the template and the lower end welded to the steel reinforcement skeleton around the template, and use the steel reinforcement skeleton to counterweight and resist buoyancy.

[0008] The concrete pouring is carried out in multiple stages. Each time, the equipment is turned back and the concrete is poured again when it is close to initial setting and loses its fluidity. This process is repeated until the concrete is completed.

[0009] The existing technology has the following problems:

[0010] (1) The small holes in the bottom horizontal template will only leak grout and will not play a sufficient role in releasing buoyancy.

[0011] (2) The weight of the steel reinforcement skeleton around the pit formwork is limited and insufficient to resist the buoyancy generated by the concrete pouring. At the same time, the stiffness between the two layers of mesh of the steel reinforcement skeleton is very small. As the buoyancy of the formwork gradually increases, the steel reinforcement skeleton deforms greatly and is pulled up by the tilt of the formwork.

[0012] (3) The problem of installing water bags is that the horizontal and vertical support rods make it very inconvenient to install water bags. At the same time, the specific gravity of water is too small, while the specific gravity of concrete is 2.4 times that of water. The buoyancy generated by the same volume of concrete displaced by the formwork is 2.4 times the weight of water, which is obviously insufficient to resist buoyancy.

[0013] (4) The internal support is made of wooden blocks and back ribs nailed together, and the facade formwork and bottom formwork are nailed together. The poured concrete will embed and lock the entire wooden box, making it impossible to dismantle the wooden box as a whole. Dismantling the wooden box support frame is not only very inconvenient, but also has a very high damage rate.

[0014] (5) Although the material stacked on top of the wooden box can be stacked enough to meet the weight requirements for anti-buoyancy, the stacked material is not integral and it is difficult to guarantee the stability of the stack. Furthermore, it is impossible to effectively connect the stack and the wooden box into a whole. Summary of the Invention

[0015] This invention addresses the shortcomings of existing technologies by providing a modular anti-buoyancy device for pit formwork. It features a compact structure, convenient construction, and good structural stability. With sufficient strength, rigidity, integrity, stability, and adequate anti-buoyancy reaction force, it effectively controls the pit formwork from tilting, floating, deforming, or collapsing, thus ensuring cross-sectional dimensions, forming quality, and construction safety.

[0016] The above-mentioned technical problems of this utility model are mainly solved by the following technical solutions:

[0017] A modular anti-buoyancy device for pit-in-pit formwork includes a concrete base with pile foundations on both sides of its lower end. A reaction foundation section assembly is located at the upper end of the concrete base, with an inverted U-shaped lifting ring at its upper end. Tie rods are provided between the upper ends of the reaction foundation section assembly and the pile foundations. The reaction foundation section assembly includes a column, with a connecting end plate between the upper end of the column and the U-shaped lifting ring. Several circularly distributed round steel lugs connected to the tie rods are located on the outer circumference of the upper part of the column.

[0018] Preferably, the lower end of the column is provided with a base plate, and a number of adjustable diagonal braces are provided in a ring at equal intervals between the middle part of the column and the base plate. Connecting lugs are provided between the adjustable diagonal braces and the column, and between the adjustable diagonal braces and the base plate.

[0019] Preferably, the lower end of the reaction foundation section assembly is provided with a support formwork integrated with the concrete base.

[0020] Preferably, the support mold frame is composed of a multi-layered mold frame, with mold support rods provided at the top, bottom, left, and right sides of the mold frame, and top rods that are inserted into the inner wall of the mold frame at both ends of the mold support rods.

[0021] Preferably, the mold frame is composed of a cubic frame structure made of templates, and the templates contain several square timbers distributed at equal intervals.

[0022] Preferably, the mold support rods are provided with shear support rods in both the longitudinal and diagonal directions.

[0023] Preferably, the tie rods are connected by turnbuckles.

[0024] This invention can achieve the following effects:

[0025] This invention provides a modular anti-buoyancy device for pit-in-pit formwork, which, compared with the prior art, features a compact structure, convenient construction, and good structural stability.

[0026] (1) Using various piles that are present in most high-rise building designs, apply sufficient reaction force to the entire pit formwork to resist buoyancy.

[0027] (2) A steel pipe fastener and adjustable top support template bracket were designed, which makes it easy to assemble and disassemble the support frame and template. The wooden back ribs are firmly installed on the back of the template components with iron nails. Adjustable top supports are set at both ends of the horizontal and vertical poles of the support frame. The "U"-shaped clamps of the top supports hold the wooden back ribs on the back of the template components and the lower layer of wooden blocks in the distribution layer, and limit iron nails are added to prevent slippage. However, when disassembling, it is only necessary to loosen the top support nuts.

[0028] (3) The formwork adopts a uniformly distributed layer structure. The distribution layer and the template and support frame below with sufficient strength and rigidity generate a sufficiently large reaction force to compress and obtain the overall effective resistance and balance of the "template and support frame pile reaction anti-buoyancy system", thus solving the stability of the resistance.

[0029] (4) The bottom of the foundation section is equipped with a steel plate base, and there are detachable and adjustable diagonal braces between the steel plate base and the column steel pipe. It has sufficient strength, rigidity, integrity, stability and sufficient anti-buoyancy reaction force, effectively controlling the pit formwork to not tilt, not float, not deform, and not collapse, thus ensuring the cross-sectional dimensions, forming quality and construction safety. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of this utility model.

[0031] Figure 2 This is a structural schematic diagram of the reaction force foundation section component in this utility model.

[0032] Figure 3 This is a structural schematic diagram of the support frame in this utility model.

[0033] Figure 4This is a schematic diagram of the structure of the mold frame in this utility model.

[0034] In the diagram: 1. Concrete base; 2. Tie rod; 3. Reaction foundation section assembly; 4. Inverted U-shaped lifting ring; 5. Turnbuckle; 6. Support formwork; 7. Pile foundation; 8. Adjustable diagonal brace; 9. Column; 10. Connecting end plate; 11. Round steel hanging lug; 12. Connecting lug plate; 13. Base plate; 14. Formwork frame; 15. Top rod; 16. Formwork support rod; 17. Shear support rod; 18. Formwork; 19. Square timber. Detailed Implementation

[0035] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0036] Example: Figure 1-4 As shown, a modular anti-buoyancy device for pit-in-pit formwork includes a concrete base 1, with pile foundations 7 on both sides of the lower end of the concrete base 1, a reaction foundation section 3 on the upper end of the concrete base 1, an inverted U-shaped lifting ring 4 on the upper end of the reaction foundation section 3, and two tie rods 2 between the upper ends of the reaction foundation section 3 and the pile foundations 7, with turnbuckles 5 connecting the two tie rods 2.

[0037] The reaction foundation assembly 3 includes a column 9. A connecting end plate 10 is provided between the upper end of the column 9 and the U-shaped lifting ring 4. The upper outer circle of the column 9 has six circularly distributed round steel lugs 11 that are connected to the tie rod 2. The lower end of the column 9 has a base plate 13. Between the middle of the column 9 and the base plate 13, there are four equally spaced circularly distributed adjustable diagonal braces 8. Connecting lugs 12 are provided between the adjustable diagonal braces 8 and the column 9, and between the adjustable diagonal braces 8 and the base plate 13.

[0038] The lower end of the foundation section component 3 is equipped with a support formwork 6 integrated with the concrete base 1. The support formwork 6 consists of a multi-layered formwork frame 14, which is a cubic frame structure composed of templates 18. Five equally spaced square timbers 19 are placed inside the templates 18. Formwork support rods 16 are provided at the top, bottom, left, and right sides of the formwork frame 14. Top rods 15 are provided at both ends of the formwork support rods 16 and the inner wall of the formwork frame 14, which are inserted into the formwork support rods 16. Shear struts 17 are provided in the staggered longitudinal and diagonal directions of the formwork support rods 16.

[0039] In summary, this modular anti-buoyancy device for pit formwork features a compact structure, convenient construction, and good structural stability. It possesses sufficient strength, rigidity, integrity, stability, and adequate anti-buoyancy reaction force, effectively controlling the pit formwork to prevent tilting, floating, deformation, and collapse, thereby ensuring cross-sectional dimensions, forming quality, and construction safety.

[0040] It will be apparent to those skilled in the art that this invention is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0041] In summary, the above description is only a specific embodiment of the present utility model, but the structural features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the patent scope of the present utility model.

Claims

1. A modular pit-in-pit form anti-float device, characterized by: The utility model relates to a concrete foundation (1) is provided with pile foundation (7) on both sides of lower end, and is provided with counterforce foundation section assembly (3) on upper end, and is provided with inverted U type lifting ring (4) on upper end of counterforce foundation section assembly (3), and is provided with pull rod (2) between counterforce foundation section assembly (3) upper portion both ends and pile foundation (7), and counterforce foundation section assembly (3) includes stand (9), and is provided with connecting end plate (10) between stand (9) upper end and U type lifting ring (4), and is provided with a plurality of circular steel lug (11) that is annular distribution and is connected with pull rod (2) on the outer circle of stand (9) upper portion.

2. A modular pit-in-pit form anti-float device according to claim 1, wherein: The lower end of the stand (9) is provided with a bottom plate (13), and a plurality of adjustable inclined struts (8) are arranged in an equidistant annular distribution between the middle part of the stand (9) and the bottom plate (13), and the adjustable inclined struts (8) are connected with the stand (9) and the bottom plate (13) through the connecting lug plates (12).

3. A modular pit-in-pit form anti-float device according to claim 1, wherein: The lower end of the counterforce foundation section assembly (3) is provided with a support formwork (6) integrated with the concrete foundation (1).

4. A modular pit-in-pit form anti-float device according to claim 3, wherein: The support formwork (6) is composed of a multi-layer structure form frame (14), and the form frame (14) is provided with form struts (16) between the upper and lower parts and the left and right parts, and the two ends of the form struts (16) are provided with top rods (15) inserted into the form struts (16) and the inner walls of the form frame (14).

5. A modular pit-in-pit form anti-float device according to claim 4, wherein: The form frame (14) is composed of a cubic frame structure of form plates (18), and the form plates (18) are provided with a plurality of square timbers (19) arranged at equal intervals.

6. A modular pit-in-pit form anti-float device according to claim 4, wherein: The form struts (16) are provided with shear struts (17) in the longitudinal and oblique directions.

7. A modular pit-in-pit form anti-float device according to claim 1, wherein: The pull rods (2) are connected by flower basket bolts (5).

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