Giant column foundation structure

Abstract

A giant column foundation structure comprises a pile foundation, a bearing platform and a bearing platform top concrete layer. A groove is formed in the middle of the top of the bearing platform; the upper ends of the vertical steel bars of the pile foundation around the groove exceed the top surface of the bearing platform; the vertical steel bars of the pile foundation located below the groove do not exceed the bottom face of the groove. A cushion layer is arranged at the bottom of the groove; the giant column comprises a steel pipe column body and a column wrapping concrete layer. The steel pipe column body is arranged at the top of the cushion layer and is fixed through a pre-embedded assembly pre-embedded in the bearing platform; a reinforcement cage is arranged on the outer side of the steel pipe column body, and the lower end of the reinforcement cage extends into the bearing platform; the bearing platform top concrete layer is poured on the top of the bearing platform, and the bearing platform top concrete layer and the column wrapping concrete layer are integrally poured and formed. The utility model solves the technical problems that after the traditional column foundation is connected with the column body, the integrity of the connecting part is poor, the lateral force resistance is weaker, and the bearing capacity of the foundation structure is limited by the property and the bearing capacity of soil.

Description

Technical Field

[0001] The utility model relates to the technical field of building engineering, in particular to a giant column foundation structure. Background Art

[0002] The structural system of a stadium consists of a steel structure roof, a concrete stand structure and a foundation structure from top to bottom. The steel structure roof system consists of a single-sided supported curved box beam and a cantilever truss. The entire roof structure is supported by 16 thin steel columns and 2 giant end columns on the west second-floor stand platform. The curved box beam is the most important structural component in the roof steel structure. The box beam is rigidly connected to the two end columns, and rigidly or hingedly connected to the 16 middle steel columns. The overturning moment generated by the cantilever roof is balanced by its own vertical bending stiffness. The axis arrangement of the concrete stand and the roof structure is logically coordinated. The roof structure columns do not need to be converted and are directly supported on the concrete columns at the bottom of the stand, so the structure is directly and efficiently stressed. Since the two giant end columns set on both sides of the second-floor stand platform are the main load-bearing components, the concrete columns and column foundations below them also need to have a high bearing capacity. The traditional column foundation structure is usually composed of concrete and steel bars, and the column body is usually connected to the top of the foundation with embedded parts. Although this type of connection has been widely used for a long time, it also has some defects and limitations when used in this project: 1. The column and the column foundation are connected by embedded parts, the integrity of the connection part is poor, the lateral force resistance is weak, and it mainly depends on the shear resistance of the embedded parts. 2. The bearing capacity of the foundation structure is limited by the nature and bearing capacity of the soil, and is easily affected by soil settlement, loosening and other problems. Utility Model Content

[0003] The utility model aims to provide a giant column foundation structure, which aims to solve the technical problems that after the traditional column base is connected to the column body, the integrity of the connection part is poor, the lateral force resistance performance is weak, and the bearing capacity of the foundation structure is limited by the properties and bearing capacity of the soil.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions.

[0005] A giant column foundation structure, comprising a pile foundation and a cap; the pile foundation is provided in a group and arranged in a matrix; the cap is cast on the top of the group of pile foundations; and a concrete layer is also provided on the top of the cap;

[0006] A groove is provided in the middle of the top of the cap, corresponding to the position of the giant column; the upper end of the vertical steel bars of the pile foundation located around the groove exceeds the top surface of the cap; the vertical steel bars of the pile foundation located below the groove do not exceed the bottom surface of the groove; a cushion layer is provided at the bottom of the groove; the giant column includes a steel pipe column body and a column outer concrete layer; the steel pipe column body is provided at the top of the cushion layer, and the giant column is fixed by a pre-embedded component pre-embedded in the cap; a steel cage is provided on the outside of the steel pipe column body, and the lower end of the steel cage extends into the cap; the top concrete layer of the cap is cast on the top of the cap, and the top concrete layer of the cap and the column outer concrete layer are cast and formed integrally; the top surface of the top concrete layer of the cap exceeds the upper end of the vertical steel bars of the pile foundation around the groove; an upper steel mesh is provided in the top concrete layer of the cap, close to the top surface of the top concrete layer of the cap; an intermediate steel mesh is provided in the top concrete layer of the cap, close to the middle position of the top concrete layer of the cap; a lower steel mesh is provided in the cap, close to the bottom surface of the cap.

[0007] Preferably, the upper part of the vertical steel bars of the pile foundation exceeds the top surface of the pile foundation concrete, and the exceeding part is bent outward to form an outward inclined section; a horizontal bent section is provided at the upper end of the outward inclined section of the vertical steel bars of the pile foundation located below the groove.

[0008] Preferably, the spacing between adjacent pile foundations is no more than 2500mm-3000mm.

[0009] Preferably, the upper layer steel mesh and the lower layer steel mesh are respectively provided with two layers; and the middle layer steel mesh is provided with one layer.

[0010] Preferably, water-swellable waterstop strips and permeable crystalline waterproof materials are sequentially arranged from the inside to the outside in the joint between the pedestal and the concrete layer on the top of the pedestal and at the sides around the pedestal.

[0011] Preferably, vertical steel meshes are provided inside the pedestal and near the surrounding sides; the lower end of the vertical steel meshes is close to the bottom surface of the pedestal, and the upper end of the vertical steel meshes is close to the top surface of the concrete layer at the top of the pedestal.

[0012] Preferably, a connecting steel mesh is arranged in the pedestal, near the top surface; one end of the connecting steel mesh is located in the pedestal, and the other end of the connecting steel mesh extends into the groove; inclined steel meshes are arranged in the pedestal, near the side surfaces around the groove; the lower part of the inclined steel mesh is located in the pedestal, and the upper part of the inclined steel mesh exceeds the top surface of the pedestal and extends into the concrete layer at the top of the pedestal.

[0013] Preferably, the embedded component includes an embedded plate and anchor bolts; the embedded plate is arranged on the top of the cushion layer, and the edges of the embedded plate are beyond the outer surface of the steel pipe column; the embedded plate is provided with through holes at intervals on the part where it exceeds the steel pipe column; there is a group of anchor bolts, which are correspondingly arranged in the through holes, and the lower ends of the anchor bolts are embedded in the pedestal, and the upper ends of the anchor bolts exceed the top surface of the embedded plate and are fixed by nuts.

[0014] Compared with the prior art, the utility model has the following characteristics and beneficial effects.

[0015] 1. The utility model is provided with a group of pile foundations at the bottom of the pedestal, which greatly improves the bearing performance of the foundation structure; at the same time, three layers of steel mesh are provided in the foundation structure of the utility model, and vertical steel meshes are provided in the pedestal and the concrete layer on the top of the pedestal and near the sides around it, which not only ensures that the foundation structure has a high ability to bear vertical loads, but also ensures that the foundation structure has a high ability to bear lateral loads, solving the technical problem that the bearing capacity of the traditional foundation structure is limited by the nature and bearing capacity of the soil.

[0016] 2. The top of the pedestal of the utility model is provided with a groove for installing a giant column, and a connecting steel mesh, an inclined steel mesh and a vertical steel mesh are provided at the connection position between the concrete layer at the top of the pedestal and the pedestal; during construction, the steel pipe column can be first connected to the embedded component at the bottom of the groove, and then the concrete layer at the top of the pedestal and the concrete layer outside the column are cast as one piece. This structure effectively increases the integrity of the structure and the lateral force resistance performance of the connection part. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0018] Figure 1 It is a plan view of the arrangement of pile foundation and giant columns of the utility model.

[0019] Figure 2 It is a vertical cross-sectional schematic diagram of the giant column foundation structure of the utility model.

[0020] Figure 3 It is a schematic diagram of the cross-sectional structure of the giant column in the utility model.

[0021] Figure 4 It is a structural schematic diagram of the joint position of the cap and the concrete layer on the top of the cap in the utility model.

[0022] Figure numerals: 1-pile foundation, 2-capping platform, 3-concrete layer on top of the capping platform, 4-giant column, 4.1-steel pipe column, 4.2-concrete layer outside the column, 4.3-reinforcement cage, 4a-rectangular section, 4b-rectangular section, 5-recess, 6-embedded component, 7-upper steel mesh, 8-middle steel mesh, 9-lower steel mesh, 10-water-expanding waterstop, 11-vertical steel mesh, 12-connecting steel mesh, 13-inclined steel mesh, 14-shear member. DETAILED DESCRIPTION

[0023] like Figure 1-4 As shown, this giant column foundation structure includes a pile foundation 1 and a cap 2; the pile foundation 1 has a group and is arranged in a matrix; the cap 2 is cast on the top of a group of pile foundations 1; and also includes a concrete layer 3 on the top of the cap;

[0024] A groove 5 is provided in the middle of the top of the cap 2, corresponding to the position of the giant column 4; the upper end of the vertical steel bars of the pile foundation 1 located around the groove 5 exceeds the top surface of the cap 2; the vertical steel bars of the pile foundation 1 located below the groove 5 do not exceed the bottom surface of the groove 5; a cushion layer is provided at the bottom of the groove 5; the giant column 4 includes a steel pipe column body 4.1 and a column outer concrete layer 4.2; the steel pipe column body 4.1 is provided on the top of the cushion layer, and the giant column 4 is fixed by an embedded component 6 embedded in the cap 2; a steel cage 4.3 is provided on the outside of the steel pipe column body 4.1, and the steel cage 4.3 is provided. The lower end of the cage 4.3 extends into the pedestal 2; the concrete layer 3 on the top of the pedestal is cast on the top of the pedestal 2, and the concrete layer 3 on the top of the pedestal and the column outer concrete layer 4.2 are cast integrally; the top surface of the concrete layer 3 on the top of the pedestal exceeds the upper end of the vertical steel bars of the pile foundation 1 around the groove 5; an upper steel mesh 7 is arranged in the concrete layer 3 on the top of the pedestal, near the top surface of the concrete layer 3 on the top of the pedestal; an intermediate steel mesh 8 is arranged in the concrete layer 3 on the top of the pedestal, near the middle position of the concrete layer 3 on the top of the pedestal; a lower steel mesh 9 is arranged in the pedestal 2, near the bottom surface of the pedestal 2.

[0025] In this embodiment, the upper part of the vertical steel bars of the pile foundation 1 exceeds the top surface of the concrete of the pile foundation 1, and the exceeding part is bent outward to form an outward inclined section; a horizontal bent section is provided at the upper end of the outward inclined section of the vertical steel bars of the pile foundation 1 located below the groove 5.

[0026] In this embodiment, the distance between adjacent pile foundations 1 is no more than 2500 mm to 3000 mm.

[0027] In this embodiment, the upper steel mesh 7 and the lower steel mesh 9 are respectively provided with two layers; the middle steel mesh 8 is provided with one layer.

[0028] In this embodiment, water-swellable waterstop strips 10 and permeable crystalline waterproof materials are sequentially arranged from the inside to the outside in the joint between the pedestal 2 and the concrete layer 3 on the top of the pedestal and on the sides near the pedestal 2.

[0029] In this embodiment, vertical steel meshes 11 are arranged inside the pedestal 2 and near the surrounding sides; the lower end of the vertical steel meshes 11 is close to the bottom surface of the pedestal 2, and the upper end of the vertical steel meshes 11 is close to the top surface of the concrete layer 3 at the top of the pedestal.

[0030] In this embodiment, a connecting steel mesh 12 is arranged in the base 2, near the top surface; one end of the connecting steel mesh 12 is located in the base 2, and the other end of the connecting steel mesh 12 extends into the groove 5; inclined steel meshes 13 are arranged in the base 2, near the side surfaces around the groove 5; the lower part of the inclined steel mesh 13 is located in the base 2, and the upper part of the inclined steel mesh 13 exceeds the top surface of the base 2 and extends into the concrete layer 3 at the top of the base.

[0031] In this embodiment, the embedded component 6 includes an embedded plate and anchor bolts; the embedded plate is arranged on the top of the cushion layer, and the edges of the embedded plate are beyond the outer surface of the steel pipe column 4.1; the embedded plate is provided with through holes at intervals on the part beyond the steel pipe column 4.1; there is a group of anchor bolts, which are correspondingly arranged in the through holes, and the lower ends of the anchor bolts are embedded in the base 2, and the upper ends of the anchor bolts are beyond the top surface of the embedded plate and are fixed by nuts.

[0032] In this embodiment, the cross section of the giant column 4 is a rectangular section 4a in the middle and semicircular sections 4b arranged at both ends of the rectangular section 4a; the major axis length of the giant column 4 is 2500mm, and the minor axis length of the giant column 4 is not less than 1000mm.

[0033] In this embodiment, shear-resistant members 14 are arranged at intervals on the outer surface of the steel tube column 4.1; and the lower end of the steel cage 4.3 is bent horizontally outward to form a horizontal folded edge.

[0034] In this embodiment, the thickness of the cushion layer is not less than 40 mm.

[0035] In this embodiment, due to the thick distribution of dredger fill and silty soft soil in this site, common quality problems such as concrete segregation, diameter shrinkage, and mud inclusion are prone to occur during pile foundation construction. During pile foundation construction, effective mouth protection measures and mud wall protection measures must be taken to prevent hole trampling. The return slurry stone chips should be identified during the drilling process. And it should be verified by the shift report records of obvious changes in drilling speed. When entering the top surface of the bearing layer, the top surface burial depth and hourly footage speed should be recorded and timely. Sand and gravel chips should be collected and recorded. After confirmation by the survey, design, supervision, and construction units, the next construction process can be entered.

[0036] In this embodiment, the pile foundation adopts bored cast-in-place piles, which need to be cleaned twice, and the thickness of the bottom sediment is strictly controlled to be less than 50mm. The sediment thickness is calculated at 1 / 2 height of the pile tip. After the hole is cleaned, the water head height should be maintained in the hole, and concrete should be poured within 30 minutes. If it exceeds 30 minutes, the bottom sediment should be re-measured. If the sediment thickness exceeds the design requirements, the hole should be cleaned again. The pile body concrete must be poured continuously. In order to ensure the quality of the pile body, the slump of the pile body concrete is controlled between 180 and 220mm. The pile body concrete must be poured continuously. In order to ensure the quality of the pile body, the slump of the pile body concrete is controlled between 180 and 220mm. After the floating slurry, the designed pile top elevation and concrete strength grade should be guaranteed. The longitudinal reinforcement of the pile body adopts stress-bearing welded joints (single-sided welding 10d, double-sided welding 5d), the stirrups are all spiral stirrups, the stirrups and stiffening hoops should be welded with each main reinforcement, and the thickness of the steel cage protective layer is 50.

[0037] The above embodiments are not exhaustive of specific implementation methods, and there may be other embodiments. The above embodiments are intended to illustrate the present utility model rather than to limit the protection scope of the present utility model. All applications derived from simple variations of the present utility model fall within the protection scope of the present utility model.

Claims

1. A giant column foundation structure, comprising a pile foundation (1) and a cap (2); the pile foundation (1) is provided in a group and arranged in a matrix; the cap (2) is cast on the top of a group of pile foundations (1); characterized in that: It also includes a concrete layer (3) on the top of the cap; A groove (5) is provided in the middle of the top of the cap (2) at a position corresponding to the giant column (4); the upper end of the vertical steel bars of the pile foundation (1) located around the groove (5) exceeds the top surface of the cap (2); the vertical steel bars of the pile foundation (1) located below the groove (5) do not exceed the bottom surface of the groove (5); a cushion layer is provided at the bottom of the groove (5); the giant column (4) comprises a steel pipe column body (4.1) and a column outer concrete layer (4.2); the steel pipe column body (4.1) is provided on the top of the cushion layer, and the steel pipe column body (4.1) is fixed by a pre-embedded component (6) pre-embedded in the cap (2); a steel cage (4.3) is provided on the outside of the steel pipe column body (4.1), The lower end of the steel cage (4.3) extends into the cap (2); the cap top concrete layer (3) is cast on the top of the cap (2), and the cap top concrete layer (3) and the column outer concrete layer (4.2) are cast in one piece; the top surface of the cap top concrete layer (3) exceeds the upper end of the vertical steel bars of the pile foundation (1) around the groove (5); an upper steel mesh (7) is arranged in the cap top concrete layer (3) near the top surface of the cap top concrete layer (3); an intermediate steel mesh (8) is arranged in the cap top concrete layer (3) near the middle of the cap top concrete layer (3); and a lower steel mesh (9) is arranged in the cap (2) near the bottom surface of the cap (2).

2. The giant column foundation structure according to claim 1, characterized in that: The upper part of the vertical steel bars of the pile foundation (1) exceeds the top surface of the concrete of the pile foundation (1), and the exceeding part is bent outward to form an outwardly inclined section; the upper end of the outwardly inclined section of the vertical steel bars of the pile foundation (1) located below the groove (5) is provided with a horizontally bent section.

3. The giant column foundation structure according to claim 1, characterized in that: The distance between adjacent pile foundations (1) is not more than 2500mm to 3000mm.

4. The mega column foundation structure according to claim 1, characterized in that: The upper steel mesh (7) and the lower steel mesh (9) are respectively provided with two layers; and the middle steel mesh (8) is provided with one layer.

5. The mega column foundation structure according to claim 1, characterized in that: Water-swellable waterstop strips (10) and permeable crystalline waterproof materials are sequentially arranged from the inside to the outside in the joint between the cap (2) and the concrete layer (3) on the top of the cap, and at the sides close to the cap (2).

6. The mega column foundation structure according to claim 1, characterized in that: Vertical steel meshes (11) are arranged inside the cap (2) and near the surrounding side surfaces; the lower end of the vertical steel meshes (11) is close to the bottom surface of the cap (2), and the upper end of the vertical steel meshes (11) is close to the top surface of the concrete layer (3) at the top of the cap.

7. The mega column foundation structure according to claim 1, characterized in that: A connecting steel mesh (12) is arranged in the cap (2) near the top surface; one end of the connecting steel mesh (12) is located in the cap (2), and the other end of the connecting steel mesh (12) extends into the groove (5); inclined steel meshes (13) are arranged in the cap (2) near the sides of the groove (5); the lower part of the inclined steel mesh (13) is located in the cap (2), and the upper part of the inclined steel mesh (13) exceeds the top surface of the cap (2) and extends into the concrete layer (3) at the top of the cap.

8. The mega column foundation structure according to claim 1, characterized in that: The embedded component (6) comprises an embedded plate and anchor bolts; the embedded plate is arranged on the top of the cushion layer, and the edges of the embedded plate are beyond the outer surface of the steel pipe column (4.1); the embedded plate is provided with through holes at intervals on the part beyond the steel pipe column (4.1); a group of anchor bolts are correspondingly arranged in the through holes, and the lower ends of the anchor bolts are embedded in the cap (2), and the upper ends of the anchor bolts are beyond the top surface of the embedded plate and are fixed by nuts.

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