Beam pile cap foundation structure

Abstract

The utility model provides a beam pile bearing platform foundation structure which comprises a foundation and an upper structure located above the foundation, the foundation comprises a rigid pile, the upper structure comprises a bearing platform beam, the bearing platform beam comprises a first beam body and a second beam body, and the first beam body and the second beam body are connected in the longitudinal direction of the rigid pile. The transverse sectional area of the second beam body is larger than that of the first beam body; the longitudinal projection plane of the second beam body covers the longitudinal projection plane of the rigid pile, a first bearing part and a second bearing part are arranged at the bottom end of the second beam body, the pile top of the rigid pile abuts against the first bearing part, and the surface layer of the top of the foundation abuts against the second bearing part. According to the bearing platform beam with the inverted-T-shaped structure, the cross section area of the second beam body is larger than that of the first beam body, so that the second beam body can be used as a pile bearing platform to bear a larger upper load, and the bearing capacity and deformation of a foundation are remarkably improved under the condition that the bearing capacity and deformation of the foundation are difficult to meet the requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of building engineering structures, in particular to a beam pile cap foundation structure. Background Art

[0002] Composite pile foundation is a pile foundation in which the foundation pile and the foundation soil under the cap are jointly loaded to improve the bearing capacity of the foundation and effectively control the post-construction settlement or differential settlement. Rigid piles are widely used because of their high compressive and bending stiffness, as well as high compressive and shear strength. However, under the existing foundation conditions, the structural design of the beam will directly affect the safety and stability of the foundation, and often the bearing capacity and deformation of the foundation cannot meet the requirements. Therefore, it is necessary to design a beam-pile cap foundation structure to solve the above problems. Utility Model Content

[0003] The utility model aims to provide a beam-pile cap foundation structure with large bearing capacity and good deformation resistance.

[0004] To this end, the utility model adopts the following technical solutions:

[0005] A beam-pile cap foundation structure comprises a foundation and an upper structure located above the foundation, wherein the foundation comprises a rigid pile, and the upper structure comprises a cap beam, wherein the cap beam comprises a first beam body and a second beam body connected longitudinally to the rigid pile, wherein the transverse cross-sectional area of ​​the second beam body is greater than that of the first beam body; the longitudinal projection surface of the second beam body covers the longitudinal projection surface of the rigid pile, and a first bearing part and a second bearing part are arranged at the bottom end of the second beam body, the top of the rigid pile abuts against the first bearing part, and the surface layer at the top of the foundation abuts against the second bearing part.

[0006] Furthermore: the upper structure also includes a secondary beam, and the secondary beam is connected between the first beam bodies of adjacent pedestal beams.

[0007] Furthermore: a structural bottom plate is provided between the secondary beam and the base beam.

[0008] Furthermore: the upper structure also includes a backfill layer, and the cap beam is buried in the backfill layer.

[0009] Furthermore: the foundation also includes a reinforcement layer and an underlying layer, the reinforcement layer is located above the underlying layer, and the rigid piles are arranged in the reinforcement layer.

[0010] Furthermore: a mattress layer is laid between the foundation and the upper structure.

[0011] Furthermore: the beam-pile cap foundation structure is suitable for soft soil foundation.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] The utility model uses an inverted T-shaped cap beam to make the cross-sectional area of ​​the second beam body larger than the cross-sectional area of ​​the first beam body, so that the second beam body can be used as a pile cap to bear a larger upper load, and when the bearing capacity and deformation of the foundation are difficult to meet the requirements, the bearing capacity and deformation of the foundation are significantly improved. Therefore, the cap beam of the utility model has the advantages of low construction cost, large bearing capacity, good deformation resistance, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the main structure of the overall structure of the utility model;

[0015] Figure 2 It is a three-dimensional structural schematic diagram of the cap beam of the utility model;

[0016] Figure 3 It is a schematic cross-sectional view of the upper structure of the overall structure of the utility model;

[0017] Figure 4 It is a schematic diagram of the cross-sectional structure of the foundation in the overall structure of the utility model.

[0018] The markings in the attached drawings are: 1-reinforcement layer; 2-underlying layer; 3-rigid piles; 4-cushion layer; 5-capping beam; 51-first beam body; 52-second beam body; 6-secondary beam; 7-structural bottom plate; 8-backfill layer. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0020] like Figure 1-4 As shown, a beam-pile foundation structure includes a foundation and a superstructure located above the foundation, wherein the foundation includes a rigid pile 3, and the superstructure includes a foundation beam 5, wherein the foundation beam 5 includes a first beam body 51 and a second beam body 52 connected longitudinally to the rigid pile 3, wherein the transverse cross-sectional area of ​​the second beam body 52 is greater than the transverse cross-sectional area of ​​the first beam body 51, so that the foundation beam 5 can be formed in a vertical direction. Figure 1The cross section of the cap beam 5 is an inverted T-shape from the viewing angle; the longitudinal projection of the second beam body 52 covers the longitudinal projection of the rigid pile 3, the cap beam 5 and the rigid pile 3 are arranged in the same row, and the rigid piles 3 in the same row can jointly support the second beam body 52 of the cap beam 5. Of course, the cap beam 5 can also be provided with a plurality of connected cap beams 5 along the arrangement direction of the rigid pile 3, the bottom end of the second beam body 52 is provided with a first bearing part and a second bearing part, the top of the rigid pile 3 is in contact with the first bearing part, and the surface layer at the top of the foundation is in contact with the second bearing part. The composite pile foundation thus formed jointly bears the upper load, so that the bearing capacity of the foundation is significantly improved, and the post-construction settlement or differential settlement is effectively controlled.

[0021] In this embodiment, the longitudinal direction is the axial direction along the pile axis of the rigid pile 3 , and the transverse direction is the radial direction along the pile axis of the rigid pile 3 .

[0022] In this embodiment, the upper structure further includes a secondary beam 6, which is connected between the first beam bodies 51 of adjacent cap beams 5; a structural bottom plate 7 is also provided between the secondary beam 6 and the cap beam 5. Therefore, the cap beam 5 is used as a support and reinforcement for the floor slab, and the bottom can be used as a pile cap for the rigid pile 3, so that it has higher compressive and bending rigidity.

[0023] In this embodiment, the upper structure also includes a backfill layer 8, and the cap beam 5 is buried in the backfill layer 8. The backfill layer 8 can be backfilled with crushed stones, so that the outer surface of the cap beam 5 can be fully in contact with the backfill layer 8, and the contact area with the crushed stones in the backfill layer 8 is further increased by the first beam body 51 and the second beam body 52 with different cross-sectional areas, thereby improving the support effect on the upper structure. At the same time, the foundation of the inverted T-shaped cap beam 5 is buried deep, and due to the diffusion effect of the foundation pressure, the foundation bearing capacity at the bottom of the structural foundation is also improved to a certain extent.

[0024] In this embodiment, the foundation also includes a reinforcement layer 1 and a subjacent layer 2, wherein the reinforcement layer 1 is located above the subjacent layer 2, and the rigid piles 3 are arranged in the reinforcement layer 1. The reinforcement layer 1 can be reinforced by the foundation treatment method commonly used in the prior art to improve its bearing capacity and reduce the settlement of the stratum, and the reinforcement method includes the use of deep mixing piles, high-pressure rotary jet piles, compacted sand and gravel piles and other technologies to improve the mechanical properties of the original soil; the subjacent layer 2 can also be treated by the existing method to avoid the safety of the upper building being threatened by excessive compression or shear damage of the subjacent layer, which will not be elaborated here.

[0025] In this embodiment, a cushion layer 4 is laid between the foundation and the superstructure, so that the cushion layer 4 is located on the surface layer of the top of the foundation. The cushion layer 4 is conducive to the diffusion of the overlying load on the pile.

[0026] The beam-pile cap foundation structure of this embodiment is suitable for soft soil foundations, and especially for the "column-free independent plate-beam structure" that bears a large upper load under soft foundation conditions. This can reduce construction costs while ensuring that the foundation bearing capacity and deformation meet corresponding requirements.

[0027] The above embodiment is only a preferred technical solution of the present invention. Those skilled in the art should understand that the technical solutions or parameters in the embodiments can be modified or replaced without departing from the principle and essence of the present invention, and all should be included in the protection scope of the present invention.

Claims

1. A beam-pile cap foundation structure, characterized in that: The invention comprises a foundation and an upper structure located above the foundation, wherein the foundation comprises a rigid pile (3), the upper structure comprises a cap beam (5), the cap beam (5) comprises a first beam body (51) and a second beam body (52) connected longitudinally to the rigid pile (3), the transverse cross-sectional area of ​​the second beam body (52) being larger than the transverse cross-sectional area of ​​the first beam body (51); the longitudinal projection surface of the second beam body (52) covers the longitudinal projection surface of the rigid pile (3), the bottom end of the second beam body (52) is provided with a first bearing part and a second bearing part, the top of the rigid pile (3) abuts against the first bearing part, and the surface layer at the top of the foundation abuts against the second bearing part.

2. A beam-pile cap foundation structure according to claim 1, characterized in that: The upper structure also includes a secondary beam (6), and the secondary beam (6) is connected between the first beam bodies (51) of adjacent pedestal beams (5).

3. A beam-pile cap foundation structure according to claim 2, characterized in that: A structural bottom plate (7) is also provided between the secondary beam (6) and the base beam (5).

4. A beam-pile cap foundation structure according to any one of claims 1 to 3, characterized in that: The upper structure also includes a backfill layer (8), and the cap beam (5) is buried in the backfill layer (8).

5. The beam-pile cap foundation structure according to claim 1, characterized in that: The foundation further comprises a reinforcement layer (1) and an underlying layer (2), wherein the reinforcement layer (1) is located above the underlying layer (2), and the rigid piles (3) are arranged in the reinforcement layer (1).

6. A beam-pile cap foundation structure according to claim 1 or 5, characterized in that: A cushion layer (4) is laid between the foundation and the upper structure.

7. The beam-pile cap foundation structure according to claim 1, characterized in that: The beam-pile cap foundation structure is suitable for soft soil foundation.

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