Raft foundation structure and construction method

Abstract

The invention discloses a raft foundation structure and a construction method.The raft foundation structure comprises a plurality of prefabricated rafts, each prefabricated raft is provided with a plurality of lifting rings, a first supporting plate is horizontally arranged at the upper end of one side of each prefabricated raft, and a second supporting plate is horizontally arranged at the lower end of the other side of each prefabricated raft; the thicknesses of the first support plate and the second support plate are the same and are respectively half of the thickness of the prefabricated raft plate; the upper surfaces of the first supporting plates are flush with the upper surfaces of the corresponding prefabricated rafts, the lower surfaces of the second supporting plates are flush with the lower surfaces of the corresponding prefabricated rafts, and after the two prefabricated rafts are in butt joint, the first supporting plates and the corresponding second supporting plates can form tight lap joint fit. According to the raft foundation structure, the prefabricated raft foundation structure is arranged, the raft foundation structure can be constructed after the multiple prefabricated rafts are in butt joint and poured, the burden of workers can be reduced, the building cost can be reduced, and the construction period can be shortened.

Description

Technical Field

[0001] This invention relates to the field of building construction, and in particular to a raft foundation structure and construction method. Background Technology

[0002] Raft foundations are large-area reinforced concrete slab foundations that support the entire building. They are also called slab raft foundations and are generally used in high-rise frame, frame-shear wall, and shear wall structures. They are widely used.

[0003] Raft foundations in related technologies typically include a steel reinforcement cage and a concrete layer. Multiple steel bars are laid on the foundation as required and tied or welded together to form a steel reinforcement cage. Concrete is then poured into the steel reinforcement cage to complete the construction of the raft foundation.

[0004] However, the construction of raft foundations in related technologies requires a large number of workers to coordinate the laying and fixing of reinforcing bars, which has disadvantages such as heavy workload for workers, increased construction costs, and long construction periods. At the same time, manual on-site laying of reinforcing bars is difficult to ensure the uniformity of spacing between adjacent reinforcing bars due to limited working conditions and tools, thus affecting the structural stability of the raft foundation, and needs to be improved. Summary of the Invention

[0005] In order to solve all or some of the above problems, the purpose of this invention is to provide a raft foundation structure and construction method, which can reduce the burden on workers, reduce construction costs, shorten the construction period, and improve the structural stability of the raft foundation.

[0006] In a first aspect, the present invention provides a raft foundation structure, comprising a plurality of precast raft slabs, each of the precast raft slabs being provided with a plurality of lifting rings, a first support plate being horizontally arranged at the upper end of one side of each precast raft slab, and a second support plate being horizontally arranged at the lower end of the other side, wherein the first support plate and the second support plate have the same thickness and are each half the thickness of the precast raft slab. The upper surface of the first support plate is flush with the upper surface of the corresponding precast raft slab, and the lower surface of the second support plate is flush with the lower surface of the corresponding precast raft slab. When the two precast raft slabs are joined together, the first support plate and the corresponding second support plate can form a tight overlapping fit.

[0007] In a preferred embodiment, the present invention may be further configured such that: each of the first support plates has a plurality of limiting posts horizontally arranged on the side away from the corresponding precast raft slab, and the plurality of limiting posts are staggered in the vertical direction; Each of the precast raft slabs has multiple limiting grooves on the side away from the corresponding first support plate. When two precast raft slabs are joined together, the multiple limiting posts can be inserted into the corresponding limiting grooves respectively.

[0008] In a preferred embodiment, the present invention may be further configured such that: each of the second support plates has a plurality of connecting columns horizontally arranged on the side away from the corresponding precast raft slab, and the plurality of connecting columns are staggered in the vertical direction; Each of the precast raft slabs has multiple connecting slots on the side away from the corresponding second support slab. When two precast raft slabs are joined together, the multiple connecting columns can be inserted into the corresponding connecting slots.

[0009] In a preferred embodiment, the present invention may be further configured such that: a first pouring channel is provided on the lower surface of each first support plate, and a plurality of pouring holes are provided on the upper surface of each first support plate, and the plurality of pouring holes are respectively connected to the corresponding first pouring channel.

[0010] In a preferred embodiment, the present invention may be further configured such that: each of the second support plates has a second pouring channel on its upper surface, the second pouring channel being aligned with the corresponding first pouring channel; and each of the second support plates has a plurality of slurry discharge holes on its lower surface, the plurality of slurry discharge holes being connected to the corresponding second pouring channel.

[0011] In a preferred embodiment, the present invention can be further configured such that: the first pouring channel and the second pouring channel each include a plurality of pouring grooves that are perpendicular to each other and interconnected, and the first pouring channel and the second pouring channel are respectively in the form of a grid groove structure. When the concrete between the first pouring channel and the second pouring channel is cured, a concrete limiting connection structure can be formed to improve the connection stability between two adjacent precast raft slabs.

[0012] In a preferred embodiment, the present invention may be further configured such that each of the precast raft slabs is provided with a Y-shaped casting pipe inside, wherein two ends of the casting pipe are flush with the upper surface of the precast raft slab and the other end is flush with the lower surface of the precast raft slab.

[0013] In a preferred embodiment, the present invention can be further configured such that: each of the prefabricated raft slabs has a positioning protrusion fixedly connected to its upper surface and a positioning groove provided on its lower surface, and the positioning protrusion matches the positioning groove to achieve horizontal positioning after multiple prefabricated raft slabs are stacked.

[0014] In a preferred embodiment, the present invention may be further configured such that the precast raft slab includes a steel reinforcement skeleton and a concrete layer, the steel reinforcement skeleton being a multi-layered grid structure, and the concrete layer being poured on the steel reinforcement skeleton.

[0015] Secondly, the present invention provides a construction method for a raft foundation structure, comprising the following steps: S1, compaction of the foundation; S2, multiple precast raft slabs are laid on the foundation and adjacent precast raft slabs are tightly joined together; S3, pour concrete for multiple precast raft slabs to form a reliable connection between them; S4 involves vibrating and leveling the poured concrete.

[0016] In summary, the present invention has the following beneficial effects: 1. By setting up a prefabricated raft foundation structure, multiple prefabricated raft slabs can be connected and poured together to realize the construction of the raft foundation structure, which can reduce the burden on workers, reduce construction costs, and shorten the construction cycle. 2. The use of prefabricated raft foundation structure allows the prefabricated raft slabs to be prefabricated in the factory. Compared with on-site construction methods, this design makes the spacing between two adjacent steel bars inside the prefabricated raft slab more controllable, and the dimensions and other parameters of the prefabricated raft slab can be more accurate, thereby ensuring the stability of the raft foundation structure. Attached Figure Description

[0017] Figure 1 This is a top view of an embodiment; Figure 2 This is a schematic diagram of the prefabricated raft slab structure in the embodiment; Figure 3 This is a schematic diagram of the prefabricated raft slab structure in the embodiment; Figure 4 This is a schematic diagram of the prefabricated raft slab structure in the embodiment; Figure 5 This is a cross-sectional view of the prefabricated raft slab in the embodiment.

[0018] Reference numerals in the attached drawings: 1. Precast raft slab; 101. Reinforcing steel frame; 102. Concrete layer; 2. Lifting ring; 3. First support plate; 4. Second support plate; 5. Limiting column; 6. Limiting groove; 7. Connecting column; 8. Connecting groove; 9. First pouring channel; 10. Pouring hole; 11. Second pouring channel; 12. Grout discharge hole; 13. Pouring pipe; 14. Positioning protrusion; 15. Positioning groove. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings.

[0020] like Figures 1-5 As an embodiment of the present invention, this embodiment discloses a raft foundation structure, including multiple prefabricated raft slabs 1, each prefabricated raft slab 1 having multiple lifting rings 2 fixedly connected to it for lifting devices to lift the prefabricated raft slab 1.

[0021] Reference Figure 1 , Figure 2 Each precast raft slab 1 has a first support plate 3 integrally formed horizontally at the upper end of one side and a second support plate 4 integrally formed horizontally at the lower end of the other side. The first support plate 3 and the second support plate 4 have the same thickness, and the thickness of the first support plate 3 and the second support plate 4 are each half the thickness of the precast raft slab 1.

[0022] Reference Figure 1 , Figure 2 , Figure 3 The upper surface of the first support plate 3 is flush with the upper surface of the corresponding precast raft slab 1, and the lower surface of the second support plate 4 is flush with the lower surface of the corresponding precast raft slab 1. When the two precast raft slabs 1 are joined together, the first support plate 3 and the corresponding second support plate 4 can form a tight overlapping fit.

[0023] The first precast raft slab 1 is laid flat on the foundation, and a level is used to check that the first precast raft slab 1 is level. Then, the second precast raft slab 1 is placed on the foundation, and the first support plate 3 of the second precast raft slab 1 overlaps with the second support plate 4 of the first precast raft slab 1. This process is repeated until multiple precast raft slabs 1 are connected. Then, concrete can be poured for multiple precast raft slabs 1.

[0024] By setting up a prefabricated raft foundation structure, multiple prefabricated raft slabs 1 can be connected and poured together to complete the construction of the raft foundation structure. This reduces the workload of workers, lowers construction costs, and shortens the construction period. Furthermore, the prefabricated raft foundation structure allows the prefabricated raft slabs 1 to be prefabricated in the factory. Compared to on-site construction methods, this design makes the spacing between adjacent reinforcing bars within the prefabricated raft slab 1 more controllable, and the dimensions and other parameters of the prefabricated raft slab 1 more precise, thereby ensuring the stability of the raft foundation structure.

[0025] Reference Figure 2 , Figure 3 , Figure 4 Each first support plate 3 has multiple horizontally integrally formed limiting posts 5 on the side away from the corresponding precast raft slab 1, and the multiple limiting posts 5 are staggered in the vertical direction. At the same time, each precast raft slab 1 has multiple limiting grooves 6 on the side away from the corresponding first support plate 3. When two precast raft slabs 1 are connected, the multiple limiting posts 5 can be inserted into the corresponding limiting grooves 6 respectively.

[0026] Reference Figure 2 , Figure 3 , Figure 4 Each second support plate 4 has multiple connecting columns 7 integrally formed horizontally on the side away from the corresponding precast raft slab 1, and the multiple connecting columns 7 are staggered in the vertical direction. At the same time, each precast raft slab 1 has multiple connecting grooves 8 on the side away from the corresponding second support plate 4. When two precast raft slabs 1 are joined together, the multiple connecting columns 7 can be inserted into the corresponding connecting grooves 8 respectively.

[0027] When two precast raft slabs 1 are joined together, multiple limiting columns 5 are inserted into the corresponding limiting grooves 6, and multiple connecting columns 7 are inserted into the corresponding connecting grooves 8, thereby improving the connection stability between the two precast raft slabs 1 and improving the structural strength of the raft foundation structure.

[0028] Meanwhile, with the cooperation of the limiting column 5 and the limiting groove 6, and the connecting column 7 and the connecting groove 8, the two precast raft slabs 1 can automatically keep level, improve the levelness of the raft foundation structure, and eliminate the need for staff to perform levelness checks on each precast raft slab 1 separately, reducing the workload of staff.

[0029] Furthermore, the staggered limiting columns 5 and connecting columns 7, when plugged into the corresponding limiting grooves 6 and connecting grooves 8, can support the connecting ends of the two precast raft slabs 1, improve the load-bearing effect of the two precast raft slabs 1 at the ends that are close to each other, and thus improve the stability of the raft foundation structure.

[0030] Reference Figure 2 , Figure 3 , Figure 4 Each first support plate 3 has a first pouring channel 9 on its lower surface and multiple pouring holes 10 on its upper surface, each of which is connected to a corresponding first pouring channel 9. Each second support plate 4 has a second pouring channel 11 on its upper surface, which is aligned with a corresponding first pouring channel 9. Each second support plate 4 has multiple slurry discharge holes 12 on its lower surface, each of which is connected to a corresponding second pouring channel 11.

[0031] When concrete is poured for the precast raft slab 1, the concrete grout enters the first pouring channel 9 through the pouring hole 10, then enters the second pouring channel 11, and is discharged to the foundation through the grout discharge hole 12. This design allows the concrete grout to fill the gap between the two precast raft slabs 1, improving the connection stability between the two precast raft slabs 1, and also improving the connection stability between the precast raft slab 1 and the foundation.

[0032] Reference Figure 2 , Figure 3 , Figure 4The first pouring channel 9 and the second pouring channel 11 each include multiple mutually perpendicular and interconnected pouring grooves, and the first pouring channel 9 and the second pouring channel 11 are respectively arranged in a grid-like groove structure. After the concrete between the first pouring channel 9 and the second pouring channel 11 has solidified, the concrete can form a concrete limiting connection structure to improve the connection stability between two adjacent precast raft slabs 1. At the same time, the grid-like columnar concrete limiting connection structure can improve the torsional resistance between the two precast raft slabs 1, thereby ensuring the shear strength of the raft foundation structure.

[0033] Reference Figure 1 , Figure 5 Each precast raft slab 1 has a Y-shaped casting pipe 13 embedded inside. Two ends of the casting pipe 13 are flush with the upper surface of the precast raft slab 1, and the other end is flush with the lower surface of the precast raft slab 1. When concrete is poured into the precast raft slab 1, the concrete slurry can enter the foundation through the casting pipe 13, which can fill the pits on the foundation surface and improve the connection stability between the precast raft slab 1 and the foundation.

[0034] Reference Figure 3 , Figure 4 Each precast raft slab 1 has a positioning protrusion 14 fixedly connected to one of the four corners of its upper surface and a positioning groove 15 provided at one of the four corners of its lower surface, with the positioning protrusion 14 matching the positioning groove 15. When multiple precast raft slabs 1 are stacked, the positioning protrusion 14 can be engaged into the corresponding positioning groove, thereby limiting the horizontal movement of the stacked precast raft slabs 1 and facilitating the transportation and other operations of the precast raft slabs 1 by the staff.

[0035] Reference Figure 1 , Figure 2 The precast raft slab 1 includes a steel reinforcement frame 101 and a concrete layer 102. The steel reinforcement frame 101 is a multi-layer grid structure. The concrete layer 102 is poured on the steel reinforcement frame 101. The pouring pipe 13 is made of iron and is welded and fixed to the steel reinforcement frame 101.

[0036] This embodiment also discloses a construction method for a raft foundation structure, including the following steps: S1 involves compacting the foundation, removing large pieces as needed, and smoothing the foundation to ensure it is as flat as possible.

[0037] S2, the first precast raft slab 1 is laid on the foundation, and the levelness of the precast raft slab 1 is checked with a level. Then, the second precast raft slab 1 is placed on the foundation, and the first support slab 3 and the second support slab 4 are overlapped. At this time, multiple limiting columns 5 are inserted into the corresponding limiting grooves 6, and multiple connecting columns 7 are inserted into the corresponding connecting grooves 8. The first pouring channel 9 and the second pouring channel 11 are aligned, and so on, until multiple precast raft slabs 1 are connected.

[0038] S3, concrete is poured for multiple precast raft slabs 1. The concrete slurry fills the first pouring channel 9 and the second pouring channel 11, and enters the foundation through the pouring pipe 13 to fill the depressions in the foundation. After the concrete has cured, it can not only achieve a reliable connection between the multiple precast raft slabs 1, but also improve the connection stability between the precast raft slabs 1 and the foundation.

[0039] S4 involves vibrating the poured concrete and then smoothing it with a leveling tool to complete the construction of the raft foundation structure.

[0040] The specific embodiments are merely illustrative of the present invention and are not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to these embodiments without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A raft foundation structure, characterized in that: It includes multiple prefabricated raft slabs (1), each of which is provided with multiple lifting rings (2). Each of the prefabricated raft slabs (1) has a first support plate (3) horizontally arranged at the upper end of one side and a second support plate (4) horizontally arranged at the lower end of the other side. The first support plate (3) and the second support plate (4) have the same thickness and are each half the thickness of the prefabricated raft slab (1). The upper surface of the first support plate (3) is flush with the upper surface of the corresponding precast raft slab (1), and the lower surface of the second support plate (4) is flush with the lower surface of the corresponding precast raft slab (1). When the two precast raft slabs (1) are joined together, the first support plate (3) and the corresponding second support plate (4) can form a tight overlapping fit.

2. The raft foundation structure according to claim 1, characterized in that: Each of the first support plates (3) has multiple limiting posts (5) horizontally arranged on the side away from the corresponding precast raft plate (1), and the multiple limiting posts (5) are staggered in the vertical direction. Each of the precast raft slabs (1) is provided with a plurality of limiting grooves (6) on the side away from the corresponding first support plate (3). When two precast raft slabs (1) are joined together, the plurality of limiting posts (5) can be inserted into the corresponding limiting grooves (6).

3. The raft foundation structure according to claim 1, characterized in that: Each of the second support plates (4) has multiple connecting columns (7) horizontally arranged on the side away from the corresponding precast raft plate (1), and the multiple connecting columns (7) are staggered in the vertical direction. Each of the precast raft slabs (1) has multiple connecting grooves (8) on the side away from the corresponding second support plate (4). When two precast raft slabs (1) are joined together, multiple connecting columns (7) can be inserted into the corresponding connecting grooves (8).

4. The raft foundation structure according to claim 1, characterized in that: Each of the first support plates (3) has a first pouring channel (9) on its lower surface and a plurality of pouring holes (10) on its upper surface, and the plurality of pouring holes (10) are respectively connected to the corresponding first pouring channel (9).

5. A raft foundation structure according to claim 4, characterized in that: Each of the second support plates (4) has a second pouring channel (11) on its upper surface. The second pouring channel (11) is aligned with the corresponding first pouring channel (9). Each of the second support plates (4) has a plurality of slurry discharge holes (12) on its lower surface. The plurality of slurry discharge holes (12) are connected to the corresponding second pouring channel (11).

6. A raft foundation structure according to claim 5, characterized in that: The first pouring channel (9) and the second pouring channel (11) each include multiple pouring grooves that are perpendicular to each other and interconnected, and the first pouring channel (9) and the second pouring channel (11) each have a grid groove structure. When the concrete between the first pouring channel (9) and the second pouring channel (11) is cured, a concrete limiting connection structure can be formed to improve the connection stability between two adjacent precast raft slabs (1).

7. A raft foundation structure according to claim 1, characterized in that: Each of the precast raft slabs (1) is provided with a Y-shaped casting pipe (13) inside. Two ends of the casting pipe (13) are flush with the upper surface of the precast raft slab (1), and the other end is flush with the lower surface of the precast raft slab (1).

8. A raft foundation structure according to claim 1, characterized in that: Each of the prefabricated raft slabs (1) has a positioning protrusion (14) fixedly connected to its upper surface and a positioning groove (15) provided on its lower surface. The positioning protrusion (14) matches the positioning groove (15) to achieve horizontal positioning after multiple prefabricated raft slabs (1) are stacked.

9. A raft foundation structure according to claim 1, characterized in that: The precast raft slab (1) includes a steel reinforcement frame (101) and a concrete layer (102). The steel reinforcement frame (101) is a multi-layer grid structure, and the concrete layer (102) is poured on the steel reinforcement frame (101).

10. A construction method for a raft foundation structure according to any one of claims 1-9, characterized in that: Includes the following steps: S1, compaction of the foundation; S2, multiple precast raft slabs (1) are laid on the foundation and two adjacent precast raft slabs (1) are tightly joined together; S3, pour concrete into multiple precast raft slabs (1) to form a reliable connection between the multiple precast raft slabs (1); S4 involves vibrating and leveling the poured concrete.

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