Soft foundation over-limit load height large formwork composite supporting system

Abstract

The utility model belongs to the field of buildings. Comprising a lime soil backfill layer, a steel plate, a fixed keel, a top plate formwork and a plurality of vertically stacked support bodies arranged between the steel plate and the fixed keel, the adjacent support bodies are connected through a composite connector, each support body is provided with a consolidation structure, the steel plate is arranged on the upper side of a soft foundation, and the lower sides of the support bodies are fixed to the steel plate through channel steel. The top plate formwork is arranged on the upper side of the fixed keel, and the upper side of the support body is connected with the fixed keel through an adjustable support. The upper side of the soft foundation is backfilled with the lime soil to form the lime soil backfilling layer, the steel plate is arranged on the upper side of the lime soil backfilling layer, the fixed keel is arranged on the lower side of the top plate formwork, the support bodies capable of being vertically stacked are arranged between the fixed keel and the steel plate, and each support body is provided with the consolidation structure. Therefore, top plate deflection deformation overrun caused by soft soil layer supporting foundation subsidence and single frame body deformation is effectively prevented.

Description

Technical Field

[0001] This utility model belongs to the field of construction, specifically a composite support system for high-rise formwork on soft foundations with excessive load. Background Technology

[0002] With social development and continuous improvement in technology, my country's industrial sector has also developed rapidly, and multifunctional buildings are constantly increasing. To meet various functional requirements, architectural designs often feature ultra-large spatial frames and ultra-thick concrete structures with floor slabs.

[0003] When encountering ultra-high or ultra-thick floor slabs during construction, caution is often required. According to the construction procedures for frame structures, foundation backfilling is carried out before the construction of the main structure's top slab. This results in the floor slab formwork support system sitting on the backfill soil. With the increase in load and span, the deflection deformation of the top slab inevitably increases, making it difficult to guarantee construction quality and reducing the safety factor. Therefore, the overall stability of the formwork support system is of paramount importance. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide a composite support system for high-strength formwork that can effectively prevent the deflection deformation of the top plate from exceeding the limit due to the settlement of the foundation supported by the weak soil layer and the deformation of the single frame.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: The composite support system for high-rise formwork on soft foundation with overload includes a lime-soil backfill layer, steel plate, fixed keel, top plate formwork, and multiple vertically stacked support bodies set between the steel plate and the fixed keel. Composite connectors are set between adjacent support bodies. Each support body is equipped with a reinforcement structure. The steel plate is set on the upper side of the soft foundation. The lower side of the support body is fixed to the steel plate by channel steel. The top plate formwork is set on the upper side of the fixed keel. The upper side of the support body is connected to the fixed keel by adjustable supports.

[0006] Preferably, the lime-soil backfill layer is provided in multiple layers. The thickness of the lime-soil backfill layer is determined according to the upper load. The layers are compacted in layers, and the loose thickness of each lime-soil backfill layer is 250-300 mm.

[0007] Preferably, the support body includes vertical uprights and horizontal tie rods. Multiple vertical uprights are arranged in horizontally arranged channel steels, and the horizontal tie rods are arranged perpendicular to the channel steels and connect the vertical uprights between the channel steels.

[0008] Preferably, the length of the horizontal tie rod is greater than the width of the horizontally arranged channel steel.

[0009] Preferably, the reinforcing structure includes horizontal scissor bracing and vertical scissor bracing, with horizontal scissor bracing parallel steel plates disposed on the underside of each support body, and vertical scissor bracing vertical steel plates disposed on each support body.

[0010] Preferably, the fixed keel includes main keels and secondary keels, with multiple main keels and multiple secondary keels arranged perpendicular to each other.

[0011] Preferably, the composite connector has a crossbar in the middle, and the ends of the adjacent vertical poles are fitted with the crossbar.

[0012] Preferably, the steel plates are welded together with short reinforcing bars.

[0013] Compared with existing technologies, the beneficial effects of this technical solution are:

[0014] This invention involves backfilling lime-soil on the upper side of a soft foundation to form a lime-soil backfill layer. A steel plate is placed on the upper side of the lime-soil backfill layer, and a fixing keel is placed on the lower side of the top slab formwork. Multiple vertically stackable support structures are set between the fixing keel and the steel plate. Each support structure has a reinforcement structure, which effectively prevents the top slab from exceeding the deflection limit due to the settlement of the foundation supported by the weak soil layer and the deformation of a single support structure. Adjacent support structures are connected by composite connectors, which facilitates the stacking and disassembly of the support structures. This makes the height of this invention adjustable and applicable to floor slabs of various heights. It features fast construction speed, low cost, high quality, safety, and environmental protection. Attached Figure Description

[0015] Figure 1 This is a structural schematic diagram of a composite support system for tall formwork on soft soil foundations subject to overload.

[0016] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0017] Figure 3 for Figure 1 Enlarged view of part B in the middle

[0018] The components include: 1. Backfill layer; 2. Steel plate; 3. Short steel bars; 4. Channel steel; 5. Vertical poles; 6. Horizontal tie rods; 7. Fasteners; 8. Horizontal scissor bracing; 9. Vertical scissor bracing; 10. Adjustable support; 11. Composite connector; 12. Horizontal bar; 13. Foundation; 14. Main keel; 15. Secondary keel; 16. Top slab formwork; 17. Concrete pouring. Detailed Implementation

[0019] Figures 1-3 This is the preferred embodiment of the present invention, which is described below in conjunction with the appendix. Figures 1-3 The present invention will be further described below.

[0020] Reference Figure 1 The soft foundation overload high formwork composite support system includes a lime-soil backfill layer 1, steel plate 2, fixed joists, top slab formwork 15, and multiple vertically stacked support structures set between the steel plate and the fixed joists. The number of vertically stacked support structures can be adjusted according to the height of the floor slab.

[0021] Based on the load value of the upper ultra-thick top slab, the thickness of the foundation replacement soil is determined by calculation software. Layered compaction is used to improve the bearing capacity of the foundation. The length of the required vertical poles 5 is calculated according to the net height of the high formwork support. The lower part of the vertical poles 5 within 6 meters is connected by traditional fasteners 7, and the remaining upper part is extended by composite connectors 11. The remaining horizontal tie rods 6 and scissor braces are extended by fasteners 7 to build a full-span steel pipe fastener formwork support system. The entire formwork frame is preloaded with the same load to reduce the deformation of the frame and foundation, so as to achieve the safety of the top slab concrete construction process and minimize the deflection deformation of the bottom of the slab after the formwork is removed.

[0022] The backfill layer 1, consisting of lime-soil, has a backfill thickness determined based on the superstructure load and is compacted in layers as required. It is laid on the weak foundation 12 to form a support system. The foundation replacement uses a 3:7 lime-soil mixture, with the soil being locally excavated cohesive soil, free from organic impurities. The lime has an aging period of no less than 7 days and must not contain unslaked quicklime lumps or other impurities. The moisture content of the fill material is controlled at 14-18% (the moisture content is ideally such that it can be formed into a ball when squeezed in the hand, but crumbles easily when lightly pinched between two fingers). The lime-soil replacement thickness is calculated based on the superstructure load. The replacement soil is compacted in layers using an electric rammer, with each layer's loose thickness controlled within 250-300 mm. A roller is then used for compaction, with each layer's loose thickness controlled within 350-400 mm, and compaction is performed at least four times. This method solves the technical problems of excessive deflection of the top slab formwork and insufficient overall stability caused by the soft supporting foundation, and its functionality is excellent.

[0023] Composite connectors 11 are set between adjacent support bodies. Each support body is equipped with a reinforcing structure. Steel plates 2 are set on the upper side of the lime-soil backfill layer 1. The lower side of the support body is fixed on the steel plates 2. The top plate template 15 is set on the upper side of the fixed keel. The upper side of the support body is connected to the fixed keel.

[0024] The support structure includes vertical uprights 5 and horizontal tie rods 6, both of which are steel pipes. Multiple channel steels 4 are horizontally arranged on a steel plate, with the vertical uprights 5 positioned within each channel steel 4. The horizontal tie rods 6 are perpendicular to the channel steels 4, connecting the vertical uprights 5 horizontally between the channel steels 4. The length of the horizontal tie rods 6 is greater than the width of the horizontally arranged channel steels 4. The vertical uprights 5 and horizontal tie rods 6 are connected by fasteners 7. Adjustable supports 10 are provided at the top of the vertical uprights 5 at the bottom of the beam.

[0025] The reinforcing structure includes horizontal scissor bracing 8 and vertical scissor bracing 9. The vertical scissor bracing 9 is installed vertically on each support structure along the steel plate to reinforce the vertical strength. When the longitudinal and transverse spacing of the uprights is 0.9m×0.9m to 1.2m×1.2m, continuous vertical scissor bracing 9 should be installed from bottom to top every four spans (not exceeding 5m) on the outer perimeter and inside the support structure, with a width of four spans. When the longitudinal and transverse spacing of the uprights is 0.4m×0.4m to 0.6m×0.6m (inclusive): continuous vertical scissor bracing 9 should be installed from bottom to top every 3m to 3.2m on the outer perimeter and inside the support structure, with a width of 3m to 3.2m. Horizontal scissor bracing 8 should be installed at the top intersection of vertical scissor bracing 9 and at the layer where the sweeping bar is installed. The distance between the horizontal scissor bracing 8 and the bottom plane of the frame should not exceed 6m. The width of the scissor bracing should be 3m to 5m to strengthen the horizontal direction.

[0026] The fixed keel includes a main keel 13 and a secondary keel 14. Multiple main keels 13 and multiple secondary keels 14 are arranged perpendicularly to each other. The main keel 13 is composed of double rows of steel pipes.

[0027] Reference Figure 2 The composite connector 11 has a horizontal bar 1101 in the middle position. The ends of the vertical poles 5 adjacent to each other are attached to the horizontal bar 1101, supporting the upper vertical pole 5 while placing it on the upper end of the lower vertical pole 5, so that the upper and lower poles are concentric.

[0028] Reference Figure 3 The steel plates 2 are welded together by short steel bars 3 between them.

[0029] Work process:

[0030] The backfill thickness of the lime-soil backfill layer 1 is determined according to the upper load and compacted in layers as required. Steel plates 2 are laid on the upper part of the lime-soil backfill layer 1 and welded in sections with short steel bars 3. Channel steel 4 is laid, the position and spacing of vertical uprights 5 are determined, and they are connected into a whole by horizontal tie rods 6 and fasteners 7. At the same time, bottom horizontal scissor bracing 8 and lower vertical scissor bracing 9 are set to form the first layer of the frame. Composite connectors 11 are installed on the upper part of the vertical uprights 5, and the upper vertical uprights 5 are installed and connected into a whole by horizontal tie rods 6 and fasteners 7. At the same time, upper horizontal scissor bracing 8 and upper vertical scissor bracing 9 are set to form the second layer of the frame. More layers of the frame can be set according to the height of the floor slab.

[0031] Install the top adjustable support 10, set the main keel 13 with double rows of steel pipes on the upper part, fully lay the secondary keel 14 with steel pipes, and lay the top plate formwork 15 to form a complete formwork support system.

[0032] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its scope of protection shall still fall within the protection scope of this utility model.

Claims

1. A composite support system for tall formwork on soft soil foundations subjected to excessive loads, characterized in that: It includes a backfill layer (1), a steel plate (2), a fixed keel, a top plate template (15), and multiple vertically stacked support bodies set between the steel plate and the fixed keel. A composite connector (11) is set between adjacent support bodies. Each support body is equipped with a reinforcement structure. The steel plate (2) is set on the upper side of the backfill layer (1), and the lower side of the support body is fixed on the steel plate (2). The top plate template (15) is set on the upper side of the fixed keel, and the upper side of the support body is connected to the fixed keel.

2. The composite support system for high-rise formwork on soft foundations under excessive load as described in claim 1, characterized in that: The aforementioned lime-soil backfill layer (1) has multiple layers.

3. The composite support system for high-rise formwork on soft foundations under excessive load as described in claim 1, characterized in that: The support body includes vertical poles (5) and horizontal tie rods (6). Multiple channel steels (4) are arranged horizontally on the steel plate (2). The vertical poles (5) are set inside the channel steels (4). The horizontal tie rods (6) are set perpendicular to the channel steels (4) and connect the vertical poles (5) between the channel steels (4).

4. The composite support system for high-rise formwork on soft foundations under excessive load as described in claim 3, characterized in that: The length of the horizontal tie rod (6) is greater than the width of the horizontally arranged channel steel (4).

5. The composite support system for high-rise formwork on soft foundations under excessive load as described in claim 1, characterized in that: The composite connector (11) has a crossbar (1101) in the middle position, and the ends of the vertical poles (5) adjacent to each other are in contact with the crossbar (1101).

6. The composite support system for high-rise formwork on soft foundations under excessive load as described in claim 1, characterized in that: The aforementioned reinforcement structure includes horizontal scissor bracing (8) and vertical scissor bracing (9). The horizontal scissor bracing (8) is parallel to the steel plate (2) and is set on the underside of each support body. The vertical scissor bracing (9) is perpendicular to the steel plate and is set on each support body.

7. The composite support system for high-rise formwork on soft foundations under excessive load as described in claim 1, characterized in that: The fixed keel includes a main keel (13) and a secondary keel (14), with multiple main keels (13) and multiple secondary keels (14) arranged perpendicularly to each other.

8. The composite support system for high-rise formwork on soft foundations under excessive load as described in claim 1, characterized in that: The adjacent steel plates (2) are welded together by short steel bars (3).

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