CN112813954A - Structure for controlling differential settlement and construction method - Google Patents

Abstract

The invention relates to an improvement of a foundation structure, in particular to a structure for controlling uneven settlement and a construction method, which can effectively control the differential settlement caused by different foundation soils and reduce the adverse effect on a building, and comprises a foundation (0), wherein the foundation (0) consists of a plurality of different foundation soils, a first reinforcing layer (1) and a second reinforcing layer (2), the first reinforcing layer (1) and the second reinforcing layer (2) are both arranged in the foundation (0), the first reinforcing layer (1) is parallel to the second reinforcing layer (2), and a plurality of cast-in-place piles (3) are also included, each cast-in-place pile (3) penetrates through the first reinforcing layer (1) and the second reinforcing layer (2), and each cast-in-place pile (3) extends to the top of the foundation (0).

Description

Structure for controlling differential settlement and construction method

Technical Field

The invention relates to an improvement of a foundation structure, in particular to a structure for controlling uneven settlement and a construction method.

Background

With the rapid development of economy, the building land area in China is less and less, and the problem of land resource shortage is more and more serious. In order to fully and reasonably utilize each land resource, a building construction unit is particularly important for the treatment mode of a special foundation, the problem that the complex foundation bears the load of a building is solved by correctly treating the uneven settlement caused by the existence of different foundation soils, and good conditions are created for enlarging the area of the building land.

The reduction of differential settlement of the foundation is the key to solve the problem of building such as building on the foundation with different foundation soils, and under the normal condition, the treatment and reinforcement mode of the foundation can be changed correspondingly according to the size of the load of the building.

The position where the foundation produces the largest differential settlement generally occurs near the boundary between the two types of foundation soils, and excessive differential settlement can have a great adverse effect on the safety of the building. Therefore, the problem of how to deal with differential settlement of different foundation soils and boundaries thereof, thereby reducing adverse effects on buildings, is an urgent technical problem to be solved.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the existing defects, and provide a structure and a construction method for controlling uneven settlement, which can effectively control the differential settlement caused by different foundation soils and reduce the adverse effect on buildings.

In order to solve the technical problems, the invention provides the following technical scheme: the utility model provides a structure for controlling differential settlement, includes the ground, the ground comprises a plurality of foundation soils different, still includes back up coat one and back up coat two, back up coat one and back up coat two are all established in the ground, back up coat one is parallel with back up coat two, still includes bored concrete pile a plurality of, and every bored concrete pile all passes back up coat one and back up coat two, and every bored concrete pile all extends to the top of ground.

Preferably, the soil foundation structure further comprises a plurality of connecting parts, the first reinforcing layers are connected through the connecting parts, and the connecting parts are arranged at adjacent boundaries of different types of foundation soil.

Preferably, the second reinforcing layers are a plurality of second reinforcing layers, and the adjacent second reinforcing layers are also connected through connecting parts.

Preferably, the connecting portion is a concrete pouring plate.

In order to solve the technical problems, the invention provides the following technical scheme: a method of controlling a structure for controlling differential settlement, comprising the steps of: the method comprises the following steps that firstly, a foundation pit is excavated downwards on a foundation, different foundation soils in the foundation pit are respectively piled up to be backfilled, boundaries among the different foundation soils are marked by marks after excavation is finished, and the whole foundation pit is numbered by the boundaries;

step two, for each foundation pit, arranging drilled holes from the center of the foundation pit according to the distribution mode of the cast-in-place piles, wherein the depth of each pile hole is the insertion depth of the cast-in-place pile in the foundation layer;

step three, reserving a steel plate base position in each pile hole, and placing an annular steel plate base;

placing a steel pipe in the pile hole until the steel pipe contacts the annular steel plate base, pulling out the steel pipe upwards while pouring concrete, stopping pouring when the distance from the top of the pile hole is 3-3.5 m, driving 3 rivets into every 30-50 cm at equal intervals from bottom to top, wherein the included angle between every two adjacent rivets is 120 degrees, backfilling foundation soil of each layer, backfilling sandy soil on the same horizontal plane to form a first reinforcing layer and a second reinforcing layer, reserving a square section with the side length of 20 cm around the boundary, and the height of the square section is 15 cm;

fifthly, pouring a concrete slab at the reserved position, and arranging reinforcing steel bars in the poured concrete slab at equal intervals, wherein the exposed length of the reinforcing steel bars is controlled to be 3-8 centimeters;

and step six, continuously pouring concrete into the pile hole, upwards pulling out the steel pipe until the steel pipe is completely pulled out, and waiting for the forming of the cast-in-place pile.

The invention has the beneficial effects that: according to the structure and the construction method for controlling the uneven settlement, the structural arrangement of the double-layer reinforcing layer, the cast-in-place pile and the concrete slab reduces the differential settlement among different foundation soils, particularly optimizes the settlement at the boundary position of the two foundation soils, improves the load bearing capacity of a foundation on an upper building, solves the unstable factor caused by the settlement difference of the different foundation soils in a deep foundation pit, and ensures the stability and the safety of the upper building.

The structure and the construction method for controlling the uneven settlement are simple and convenient to operate and easy to construct, and can ensure that the differential settlement of the most unfavorable position of the foundation soil is as small as possible.

Drawings

FIG. 1 is a cross-sectional view of the present invention;

FIG. 2 is a cross-sectional view of a foundation pit and a pile hole under construction;

FIG. 3 is a longitudinal sectional view of a cast-in-place pile;

FIG. 4 is a top view of a cast-in-place pile;

fig. 5 is a cross-sectional view and a longitudinal sectional view of a concrete slab structure.

Description of the drawings: 0. a foundation; 1. a first reinforcing layer; 2. a second reinforcing layer; 3. filling piles; 4. a connecting portion.

Detailed Description

The following description of the preferred embodiments of the present invention is provided for the purpose of illustration and description, and is in no way intended to limit the invention.

A structure for controlling uneven settlement comprises a foundation 0, wherein the foundation 0 is composed of a plurality of different types of foundation soil, the structure further comprises a first reinforcing layer 1 and a second reinforcing layer 2, the first reinforcing layer 1 and the second reinforcing layer 2 are arranged in the foundation 0, the first reinforcing layer 1 is parallel to the second reinforcing layer 2, a plurality of cast-in-place piles 3 are further included, each cast-in-place pile 3 penetrates through the first reinforcing layer 1 and the second reinforcing layer 2, and each cast-in-place pile 3 extends to the top of the foundation 0; the foundation soil is characterized by further comprising a plurality of connecting parts 4, wherein the first reinforcing layers 1 are connected through the connecting parts 4, and the connecting parts 4 are arranged at adjacent boundaries of different types of foundation soil; the second reinforcing layers 2 are multiple, and the adjacent second reinforcing layers 2 are also connected through connecting parts 4; the connecting part 4 is a concrete pouring plate.

A method of controlling a structure for controlling differential settlement, comprising the steps of: the method comprises the following steps that firstly, a foundation pit is excavated downwards on a foundation, different foundation soils in the foundation pit are respectively piled up to be backfilled, boundaries among the different foundation soils are marked by marks after excavation is finished, and the whole foundation pit is numbered by the boundaries;

step two, for each foundation pit, arranging drilled holes from the center of the foundation pit according to the distribution mode of the cast-in-place piles, wherein the depth of each pile hole is the insertion depth of the cast-in-place pile in the foundation layer;

step three, reserving a steel plate base position in each pile hole, and placing an annular steel plate base;

placing a steel pipe in the pile hole until the steel pipe contacts the annular steel plate base, pulling out the steel pipe upwards while pouring concrete, stopping pouring when the distance from the top of the pile hole is 3-3.5 m, driving 3 rivets into every 30-50 cm at equal intervals from bottom to top, wherein the included angle between every two adjacent rivets is 120 degrees, backfilling foundation soil of each layer, backfilling sandy soil on the same horizontal plane to form a first reinforcing layer and a second reinforcing layer, reserving a square section with the side length of 20 cm around the boundary, and the height of the square section is 15 cm;

fifthly, pouring a concrete slab at the reserved position, and arranging reinforcing steel bars in the poured concrete slab at equal intervals, wherein the exposed length of the reinforcing steel bars is controlled to be 3-8 centimeters;

and step six, continuously pouring concrete into the pile hole, upwards pulling out the steel pipe until the steel pipe is completely pulled out, and waiting for the forming of the cast-in-place pile.

The above embodiments are preferred embodiments of the present invention, and those skilled in the art can make variations and modifications to the above embodiments, therefore, the present invention is not limited to the above embodiments, and any obvious improvements, substitutions or modifications made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims (5)

1. A structure for controlling differential settlement, comprising a foundation (0), said foundation (0) being composed of a plurality of different foundation soils, characterized in that: still include back up coat one (1) and back up coat two (2), back up coat one (1) and back up coat two (2) are all established in ground (0), back up coat one (1) is parallel with back up coat two (2), still includes bored concrete pile (3) a plurality of, and every bored concrete pile (3) all passes back up coat one (1) and back up coat two (2), and every bored concrete pile (3) all extends to the top of ground (0).

2. The structure for controlling differential settlement of claim 1, wherein: the concrete foundation is characterized by further comprising a plurality of first reinforcing layers (1), the adjacent first reinforcing layers (1) are connected through the connecting portions (4), and the connecting portions (4) are arranged at adjacent boundaries of different types of foundation soil.

3. The structure for controlling differential settlement of claim 2, wherein: the second reinforcing layers (2) are multiple, and the adjacent second reinforcing layers (2) are also connected through connecting parts (4).

4. The structure for controlling differential settlement of claim 2 or 3, wherein: the connecting part (4) is a concrete pouring plate.

5. A method of controlling a structure for controlling differential settlement as defined in claim 1, wherein: the method comprises the following steps: step one, a foundation pit is excavated downwards on a foundation (0), different foundation soils in the foundation pit are respectively piled up to be backfilled, boundaries among the different foundation soils are marked by marks after excavation is finished, and the whole foundation pit is numbered by the boundaries;

step two, for each foundation pit, arranging drilled holes from the center of the foundation pit according to the distribution mode of the cast-in-place piles, wherein the depth of each pile hole is the insertion depth of the cast-in-place pile in the foundation layer;

step three, reserving a steel plate base position in each pile hole, and placing an annular steel plate base;

placing a steel pipe in the pile hole until the steel pipe contacts the circular steel plate base, pulling out the steel pipe upwards while pouring concrete, stopping pouring when the distance from the top of the pile hole is 3-3.5 meters, driving 3 rivets every 30-50 centimeters from bottom to top at equal intervals, enabling an included angle between every two adjacent rivets to be 120 degrees, backfilling foundation soil of each layer, backfilling sandy soil on the same horizontal plane to form a first reinforcing layer (1) and a second reinforcing layer (2), reserving a square section with the side length of 20 centimeters around a boundary, and enabling the height of the square section to be 15 centimeters;

fifthly, pouring a concrete slab at the reserved position, and arranging reinforcing steel bars in the poured concrete slab at equal intervals, wherein the exposed length of the reinforcing steel bars is controlled to be 3-8 centimeters;

and step six, continuously pouring concrete into the pile hole, upwards pulling out the steel pipe until the steel pipe is completely pulled out, and waiting for the forming of the cast-in-place pile.

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