CN109024651B - Steel pipe concrete mixed pile foundation and construction method - Google Patents

Steel pipe concrete mixed pile foundation and construction method Download PDF

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Publication number
CN109024651B
CN109024651B CN201810818528.8A CN201810818528A CN109024651B CN 109024651 B CN109024651 B CN 109024651B CN 201810818528 A CN201810818528 A CN 201810818528A CN 109024651 B CN109024651 B CN 109024651B
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steel pipe
diameter
pile
concrete
steel
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CN109024651A (en
Inventor
季建东
陈安洋
王彬
李保俊
张科峰
臧博
韩锋
杨坤
肖玮
罗强
刘秀珍
刘志华
李卓然
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Shanxi Transportation Technology Research and Development Co Ltd
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Shanxi Province Transport Science Research Institute
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00Foundations as substructures
    • E02D27/10Deep foundations
    • E02D27/12Pile foundations
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • E02D5/34Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E02D5/38Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds

Abstract

The invention belongs to the technical field of bridge pile foundation engineering, and relates to a concrete-filled steel tube pile foundation and a construction method, wherein the concrete-filled steel tube pile foundation comprises a concrete-filled steel tube pile and a reinforced concrete pile; the steel pipe concrete structure pile and the reinforced concrete structure pile are sequentially connected from top to bottom to form an integral pile foundation; the steel pipe concrete structure pile is arranged above the bending moment zero point of the integral pile foundation; the reinforced concrete structure pile is arranged below the bending moment zero point of the integral pile foundation; the grade of the concrete filled in the reinforced concrete structure pile is lower than that of the concrete filled in the steel pipe concrete structure pile. The invention provides a concrete filled steel tube mixed pile foundation and a construction method, wherein the concrete filled steel tube mixed pile foundation is convenient to construct, good in anti-seismic performance and high in bearing capacity, and can reduce construction difficulty and engineering cost.

Description

Steel pipe concrete mixed pile foundation and construction method
Technical Field
The invention belongs to the technical field of bridge pile foundation engineering, relates to a concrete-filled steel tube mixed pile foundation and a construction method, and particularly relates to a mixed structure pile foundation and a construction method, wherein a concrete-filled steel tube member and a reinforced concrete member are combined together to bear force together.
Background
In the areas with high seismic fortification intensity, particularly in bridge engineering with deep water, large flushing hydrological conditions and weak stratum geological conditions, the pile foundation is used as an important component of the bridge engineering and has extremely high requirements on seismic resistance, and the pile foundation not only effectively transfers the upper structure load of the bridge to the foundation, but also resists the horizontal load caused by the earthquake. The pile foundation is under water or underground, and once damage occurs, repair is extremely difficult.
At present stage bridge pile foundation mainly has reinforced concrete pile foundation, steel-pipe pile or steel pipe intussuseption concrete formed steel pipe concrete pile, and the pile foundation of whatever type all embodies single component form. For example, the reinforced concrete pile foundation is convenient to construct and good in economy, but the horizontal bearing capacity and the ductility are poor; steel-pipe pile and steel pipe concrete pile, horizontal bearing capacity and ductility are better, but the construction degree of difficulty is great, and is with high costs.
In the pile foundation theory of calculation, horizontal load is undertaken to the pile bolck within the certain limit, exceeds this scope pile foundation and only undertakes vertical load, if can set up different component forms respectively at different atress sections and form mixed structure according to the atress characteristics of pile foundation, will improve the anti-seismic performance of pile foundation simultaneously and reduce the construction degree of difficulty and cost input by a wide margin.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides the concrete filled steel tube mixed pile foundation and the construction method, wherein the concrete filled steel tube mixed pile foundation is convenient to construct, good in anti-seismic performance and high in bearing capacity, and the construction difficulty and the construction cost can be reduced.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a steel pipe concrete mixes pile foundation which characterized in that: the steel pipe concrete mixed pile foundation comprises a steel pipe concrete structure pile and a reinforced concrete structure pile; the steel pipe concrete structure pile and the reinforced concrete structure pile are sequentially connected from top to bottom to form an integral pile foundation; the steel pipe concrete structure pile is arranged above the bending moment zero point of the integral pile foundation; the reinforced concrete structure pile is arranged below the bending moment zero point of the integral pile foundation; the grade of the concrete adopted by the reinforced concrete structure pile is lower than that of the concrete adopted by the steel pipe concrete structure pile.
Preferably, the steel pipe concrete structure pile adopted by the invention comprises a steel pipe with equal diameter, a reducing steel pipe and a steel pipe with an increased diameter section; the equal-diameter steel pipe is connected with the diameter increasing section steel pipe through the reducing steel pipe to form an integral hollow tubular structure; the inner diameter of the steel pipe at the diameter increasing section is larger than that of the steel pipe with the same diameter; welding steel bars are arranged inside the steel pipe at the diameter increasing section along the axial direction of the steel pipe at the diameter increasing section; the welded steel bars are connected with the reinforced concrete structure piles; and high-grade concrete is filled in the equal-diameter steel pipes, the reducing steel pipes and the diameter increasing section steel pipes.
Preferably, the inside of the steel pipe with the increased diameter section adopted by the invention is provided with shear nails along the radial direction of the steel pipe with the increased diameter section.
Preferably, the inside of the reducing steel pipe adopted by the invention is provided with an annular clapboard; steel pipe positioning steel bars are arranged outside the equal-diameter steel pipes; and a grouting pipe is arranged outside the equal-diameter steel pipe.
Preferably, the steel casing is sleeved outside the equal-diameter steel pipe adopted by the invention; the outer diameter of the steel casing is slightly larger than the diameter of a pile foundation construction hole; small stones are filled between the steel casing and the equal-diameter steel pipe; the diameter of the small stones is 15 mm-20 mm; and curing slurry is filled between the steel casing and the small stones, between the small stones and the equal-diameter steel pipe and between the adjacent small stones.
Preferably, the reinforced concrete structure pile adopted by the invention comprises a steel reinforcement cage main reinforcement; and the welded steel bars are connected with the main reinforcement of the steel reinforcement cage through steel bar connectors.
The construction method of the concrete filled steel tube mixed pile foundation is characterized by comprising the following steps of: the construction method comprises the following steps:
1) drilling holes on a pile foundation after inserting and striking a steel casing on a construction ground or an overwater construction platform; (ii) a
2) Placing a steel reinforcement cage main reinforcement in the pile hole, wherein the top of the steel reinforcement cage main reinforcement is slightly exposed out of the pile hole;
3) welding the equal-diameter steel pipe, the variable-diameter steel pipe and the diameter increasing section steel pipe to form an integral hollow tubular structure, and vertically hoisting the hollow tubular structure to the position above the pile hole;
4) connecting a welding steel bar pre-welded in the steel pipe with the diameter increasing section with a steel bar cage main steel bar through a steel bar connector above the pile hole to form an integral structure, and then completely putting the integral structure into the pile hole;
5) pouring low-grade concrete into the main reinforcement of the steel reinforcement cage through the guide pipe until the concrete reaches the bottom of the steel pipe with the increased diameter section;
6) putting small stones between the equal-diameter steel pipe and the steel casing; pouring high-grade concrete inside the equal-diameter steel pipe, the reducing steel pipe and the diameter-increasing section steel pipe while throwing the small stones; pouring high-grade concrete from the top of low-grade concrete; the rising speed of the high-grade concrete in the equal-diameter steel pipe, the reducing steel pipe and the diameter increasing section steel pipe is the same as the putting speed of small stones;
7) when the equal-diameter steel pipe is turned upwards to see high-grade concrete, stopping pouring the high-grade concrete; and after the high-grade concrete in the equal-diameter steel pipe, the reducing steel pipe and the diameter increasing section steel pipe is finally set, grouting treatment is carried out on a gap between the equal-diameter steel pipe and the steel casing through a grouting pipe outside the equal-diameter steel pipe, and after the grouting is solidified, a steel pipe concrete mixed pile foundation is formed.
The invention has the advantages that:
the invention provides a concrete-filled steel tube mixed pile foundation and a construction method, wherein the concrete-filled steel tube mixed pile foundation comprises a concrete-filled steel tube structure pile and a reinforced concrete structure pile; the steel pipe concrete structure pile and the reinforced concrete structure pile are sequentially connected from top to bottom to form an integral pile foundation; the steel pipe concrete structure pile is arranged above the bending moment zero point of the integral pile foundation; the reinforced concrete structure pile is arranged below the bending moment zero point of the integral pile foundation; the grade of the concrete filled in the reinforced concrete structure pile is lower than that of the concrete filled in the steel pipe concrete structure pile. The steel pipe concrete mixed pile foundation provided by the invention has the advantages of convenient construction, good structural seismic performance and high bearing capacity, and is particularly suitable for bridge pile foundations with strict seismic requirements of large-span bridges in high-intensity areas. The pile foundation is in a form of a steel pipe concrete reinforced concrete structure, high-grade concrete is filled in an upper steel pipe, the length of the steel pipe exceeds the zero point of the bending moment of the pile foundation through theoretical calculation, and the pile foundation mainly bears the horizontal load of the bridge; the lower part of the pile foundation adopts a low-grade reinforced concrete form, and the pile foundation of the part mainly bears the vertical load of the bridge; and filling small stones into the gap between the outer wall of the steel pipe and the wall of the drilled hole, and then grouting to form the final steel pipe concrete mixed pile foundation. The invention has the outstanding characteristics that the horizontal bending moment of the pile foundation caused by the action of earthquake force is mainly born by the steel pipe concrete part, the reinforced concrete part mainly bears the vertical load of the bridge, the steel pipe concrete part and the reinforced concrete part in the mixed pile can select different outer diameters and sizes according to the stress requirement, the soil body in the pile length range of the section can provide horizontal resistance and side friction resistance by grouting outside the steel pipe wall, and the horizontal bearing capacity and the vertical load of the pile foundation are effectively enhanced. The steel pipe concrete mixed pile foundation and the construction method provided by the invention are different from a steel pipe concrete composite pile formed by utilizing a permanent steel casing and a concrete pile, the steel pipe in the pile foundation of the mixed structure, the concrete in the steel pipe and the reinforced concrete can set different section sizes and material strength grades according to the stress requirement, and meanwhile, the steel pipe and the concrete in the steel pipe are not doped with mud skin, the connection is reliable, the performance is stable, and therefore, the steel pipe concrete mixed pile foundation has better stress performance compared with the steel pipe concrete composite pile.
Drawings
Fig. 1 is a schematic structural diagram of a concrete filled steel tube mixed pile foundation provided by the invention in the using process;
FIG. 2 is a schematic structural diagram of a concrete filled steel tube mixed pile foundation provided by the present invention;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is a cross-sectional view taken along line B-B of FIG. 2;
FIG. 5 is a schematic view of the steel tube and the reinforcement cage of the present invention being hoisted into a borehole;
FIG. 6 is a schematic view of the present invention of pouring low grade concrete for the steel pipe concrete mixed pile foundation;
FIG. 7 is a schematic view of the present invention of pouring and replacing high grade concrete and filling small stones on the pile side;
reference numbers in the figures:
1-equal diameter steel pipe; 2-reducing steel pipe; 3-diameter increasing section steel pipe; 4-welding reinforcing steel bars; 5-an annular partition plate; 6-shear nails; 7-positioning the steel bars by using steel pipes; 8-grouting pipe; 9-a steel bar connector; 10-a main reinforcement of a reinforcement cage; 11-a steel casing; 12-two different strength concrete interfaces; 13-a catheter; 14-low grade concrete; 15-high grade concrete; 16-small stones; 17-constructing a ground or water construction platform; 18-maximum flush line.
Detailed Description
Referring to fig. 1, the present invention provides a concrete filled steel tube (reinforced concrete) hybrid pile foundation, which includes a concrete filled steel tube (ferroconcrete) structure pile and a reinforced concrete structure pile; the steel pipe concrete structure pile and the reinforced concrete structure pile are sequentially connected from top to bottom to form an integral pile foundation; the steel pipe concrete structure pile is arranged above the bending moment zero point of the integral pile foundation; the reinforced concrete structure pile is arranged below the bending moment zero point of the integral pile foundation; the grade of the concrete filled in the reinforced concrete structure pile is lower than that of the concrete filled in the steel pipe concrete structure pile.
Wherein:
the steel pipe concrete structure pile comprises an equal-diameter steel pipe 1, a reducing steel pipe 2 and a diameter increasing section steel pipe 3; the equal-diameter steel pipe 1 is connected with the diameter-increasing section steel pipe 3 through the reducing steel pipe 2 to form an integral hollow tubular structure; the inner diameter of the steel pipe 3 at the diameter increasing section is larger than that of the steel pipe 1 with the same diameter; the inside of the diameter-increasing section steel pipe 3 is provided with a welding steel bar 4 along the axial direction of the diameter-increasing section steel pipe 3; welding steel bars 4 are connected with the reinforced concrete structure pile; the equal-diameter steel pipe 1, the reducing steel pipe 2 and the diameter-increasing section steel pipe 3 are filled with high-grade concrete 15.
A shear pin 6 is arranged in the diameter-increased section steel pipe 3 along the radial direction of the diameter-increased section steel pipe 3; an annular partition plate 5 is arranged inside the reducing steel pipe 2; the outside of the equal-diameter steel pipe 1 is provided with a steel pipe positioning steel bar 7; the outer part of the equal-diameter steel pipe 1 is provided with a grouting pipe 8. The diameter of the steel pile casing 11 is larger than the diameter of a pile foundation construction hole and is not smaller than 300mm, and the length of the steel pile casing 11 should exceed the maximum flushing line 18 (the maximum flushing line 18 is the maximum depth of a river flushing hollowed foundation, and the bottom end of the steel pile casing should exceed the maximum flushing line by 2m in order to protect the pile foundation); the steel casing 11 and the equal-diameter steel pipe 1 are filled with small stones 16; the diameter of the small stones 16 is 15 mm-20 mm; and solidified slurry is filled between the steel casing 11 and the small stones 16, between the small stones 16 and the equal-diameter steel pipe 1 and between the adjacent small stones 16.
The reinforced concrete structure pile adopted by the invention comprises a steel reinforcement cage main reinforcement 10; the welded steel bar 4 is connected with a steel bar cage main bar 10 through a steel bar connector 9; the conduit 13 extends into the reinforcement cage 10 and fills the reinforcement cage 10 with low grade concrete 14.
A construction method based on the concrete filled steel tube mixed pile foundation comprises the following steps:
1) after inserting and drilling the steel casing 11 at the construction ground or the water construction platform 17, drilling a hole on the pile foundation; (ii) a
2) Placing a steel reinforcement cage main reinforcement 10 in the pile hole, wherein the top of the steel reinforcement cage main reinforcement 10 is slightly exposed out of the pile hole;
3) welding the equal-diameter steel pipe 1, the reducing steel pipe 2 and the diameter increasing section steel pipe 3 to form an integral hollow tubular structure, and vertically hoisting the hollow tubular structure to the position above the pile hole;
4) connecting a welding steel bar 4 welded in advance in the steel pipe 3 with the diameter increasing section with a steel bar cage main bar 10 through a steel bar connector 9 above the pile hole to form an integral structure, and then completely lowering the integral structure into the pile hole;
5) pouring low-grade concrete 14 into the main reinforcement 10 of the steel reinforcement cage through the guide pipe 13 until the bottom of the steel pipe 3 with the increased diameter is reached;
6) putting small stones 16 between the equal-diameter steel pipe 1 and the steel casing 11; pouring high-grade concrete 15 into the equal-diameter steel pipe 1, the reducing steel pipe 2 and the diameter increasing section steel pipe 3 while throwing the small stones 16; pouring high-grade concrete 15 from the top of the low-grade concrete 14; the rising speed of the high-grade concrete 15 in the equal-diameter steel pipe 1, the reducing steel pipe 2 and the diameter-increasing section steel pipe 3 is the same as the putting speed of the small stones 16;
7) when the equal-diameter steel pipe 1 is turned upwards to see the high-grade concrete 15, stopping pouring the high-grade concrete 15; and after the high-grade concrete 15 in the equal-diameter steel pipe 1, the reducing steel pipe 2 and the diameter increasing section steel pipe 3 is finally set, grouting treatment is carried out on a gap between the equal-diameter steel pipe 1 and the steel casing 11 through a grouting pipe 8 outside the equal-diameter steel pipe 1, and after the grouting is solidified, a steel pipe concrete mixed pile foundation is formed.
The invention is further explained by combining the attached drawings and the embodiment, and takes a concrete filled steel tube pile foundation with the external diameter of 1000mm as an example for connecting a reinforced concrete pile foundation mixed structure pile with the diameter of 1500 mm.
The utility model provides a concrete filled steel tube mixed pile foundation, pile foundation upper segment is steel pipe concrete structure, and the hypomere is reinforced concrete structure. The outer diameter of the steel pipe in the steel pipe concrete structure is smaller than the bore diameter of the drill hole, and the steel pipe structure with the variable lower end is formed by the equal-diameter steel pipe 1, the variable-diameter steel pipe 2 and the diameter-increasing section steel pipe 3. The steel pipe in the steel pipe concrete structure is connected with a main reinforcement cage 10 in the reinforced concrete structure pile into a whole through a pre-welded reinforcement 4 in the steel pipe 3 of the diameter increasing section. The shear nails 6 are prewelded in the steel pipe 3 with the increased diameter. Concrete with different strength grades is adopted in the steel pipe concrete structure and the reinforced concrete structure, high-grade concrete 15 is poured in a steel pipe in the steel pipe concrete structure, low-grade concrete 14 is adopted in the reinforced concrete structure, and concrete pouring of a mixed pile is carried out in two steps. And filling clean small stones 16 between the outer wall of the steel pipe and the inner wall of the drilled hole, grouting and curing simultaneously, wherein the outer wall of the steel pipe is provided with a grouting pipe 8, and the outer wall of the equal-diameter steel pipe 1 is welded with steel pipe positioning steel bars 7.
The purpose of the invention is realized by the following technical scheme: as shown in figure 1, the equal diameter steel pipe 1 is made of steel with the diameter of 1000mm and the wall thickness of 24mmQ420, the diameter of the reducing steel pipe 2 is linearly changed to 1404mm from 1000mm, the length of 1500mm, the material is the same as the steel pipe 1, the diameter of the diameter increasing section steel pipe 3 is 1404mm, the length of 1500mm, the material is the same as the diameter of the steel pipe 1, the upper end and the lower end of the reducing steel pipe 2 are respectively provided with an annular partition plate 5, and the diameter of a reinforced concrete pile foundation is 1500.
Referring to fig. 2 and 3, 3 grouting pipes 8 are arranged on the outer wall of the equal-diameter steel pipe 1. Referring to fig. 2 and 4, the steel pipe 3 with the increased diameter is prefabricated in a factory, and welded steel bars 4 arranged in the same way as the steel cage main bars 10 are welded on the inner wall of the steel pipe according to the specification requirements.
Referring to fig. 5, the steel pipe 3 with the increased diameter section is connected with the main reinforcement 10 of the reinforcement cage into a whole through the welded reinforcement 4 welded in advance by the reinforcement connector 9, so that the field welding is avoided, the workload is greatly reduced, and the connection between the steel pipe and the main reinforcement of the reinforcement cage can be ensured.
Referring to fig. 6, the low-grade concrete 14 of the reinforced concrete part is poured by using the guide pipe 13 until the pouring surface reaches the interface 12 of the two concrete strengths, and the guide pipe 13 is kept embedded in the low-grade concrete 14 for 3-4 m.
Referring to fig. 7, when high-grade concrete 15 in the steel pipe begins to be poured, clean small stones 16 with the diameter of 15 mm-20 mm are thrown into a gap between the outer wall of the equal-diameter steel pipe 1 and a drill hole (a steel casing 11), the throwing speed is the same as the rising liquid level of the high-grade concrete 15 in the steel pipe, and when the high-grade concrete 15 is seen in the steel pipe in an upward turning mode, pouring of the high-grade concrete 15 is stopped; after the concrete is finally set, grouting treatment is carried out on the hole gap of the steel pipe outer pile through a grouting pipe 8 arranged on the outer side of the steel pipe pile in advance, and grouting construction is required to meet relevant standard requirements.
And (5) continuing the construction of the bridge pile foundation bearing platform after the pile foundation is constructed according to the steps.

Claims (2)

1. The utility model provides a steel pipe concrete mixes pile foundation which characterized in that: the steel pipe concrete mixed pile foundation comprises a steel pipe concrete structure pile and a reinforced concrete structure pile; the steel pipe concrete structure pile and the reinforced concrete structure pile are sequentially connected from top to bottom to form an integral pile foundation; the steel pipe concrete structure pile is arranged above the bending moment zero point of the integral pile foundation; the reinforced concrete structure pile is arranged below the bending moment zero point of the integral pile foundation; the grade of concrete adopted by the reinforced concrete structure pile is lower than that of concrete adopted by the steel pipe concrete structure pile;
the steel pipe concrete structure pile comprises an equal-diameter steel pipe (1), a reducing steel pipe (2) and a diameter increasing section steel pipe (3); the equal-diameter steel pipe (1) is connected with the diameter-increasing section steel pipe (3) through the reducing steel pipe (2) to form an integral hollow tubular structure; the inner diameter of the steel pipe (3) with the diameter increasing section is larger than that of the steel pipe (1) with the same diameter; welding steel bars (4) are arranged inside the diameter-increasing section steel pipe (3) along the axial direction of the diameter-increasing section steel pipe (3); the welded steel bars (4) are connected with the reinforced concrete structural pile; high-grade concrete (15) is filled in the equal-diameter steel pipe (1), the reducing steel pipe (2) and the diameter increasing section steel pipe (3);
shear nails (6) are arranged inside the diameter-increasing section steel pipe (3) along the radial direction of the diameter-increasing section steel pipe (3);
an annular partition plate (5) is arranged inside the reducing steel pipe (2); a steel pipe positioning steel bar (7) is arranged outside the equal-diameter steel pipe (1); a grouting pipe (8) is arranged outside the equal-diameter steel pipe (1);
a steel protective cylinder (11) is sleeved outside the equal-diameter steel pipe (1); the outer diameter of the steel casing (11) is slightly larger than the diameter of a pile foundation construction hole; small stones (16) are filled between the steel casing (11) and the equal-diameter steel pipe (1); the diameter of the small stones (16) is 15 mm-20 mm; solidified slurry is filled between the steel casing (11) and the small stones (16), between the small stones (16) and the equal-diameter steel pipe (1) and between the adjacent small stones (16);
the reinforced concrete structure pile comprises a steel reinforcement cage main reinforcement (10); the welding steel bars (4) are connected with the steel bar cage main bars (10) through steel bar connectors (9).
2. A construction method of a concrete filled steel tube mixed pile foundation according to claim 1, characterized in that: the construction method comprises the following steps:
1) after inserting and drilling the steel casing (11) at the construction ground or the water construction platform (17), drilling holes on the pile foundation;
2) placing a reinforcement cage in the pile hole, wherein the top of a main reinforcement (10) of the reinforcement cage is slightly exposed out of the pile hole;
3) welding the equal-diameter steel pipe (1), the variable-diameter steel pipe (2) and the diameter-increasing section steel pipe (3) to form an integral hollow tubular structure, and vertically hoisting the integral hollow tubular structure to the position above the pile hole;
4) welding steel bars (4) which are welded in advance inside the steel pipe (3) with the increased diameter section are connected with a steel bar cage main bar (10) through a steel bar connector (9) above the pile hole to form an integral structure, and then the integral structure is completely put into the pile hole;
5) pouring low-grade concrete (14) into the pile hole through the guide pipe (13) until the bottom of the steel pipe (3) with the diameter increased section is reached;
6) putting small stones (16) between the equal-diameter steel pipe (1) and the steel casing (11); casting high-grade concrete (15) inside the equal-diameter steel pipe (1), the reducing steel pipe (2) and the diameter-increasing section steel pipe (3) while throwing the small stones (16); the high-grade concrete (15) is poured from the top of the low-grade concrete (14); the rising speed of the high-grade concrete (15) in the equal-diameter steel pipe (1), the reducing steel pipe (2) and the diameter increasing section steel pipe (3) is the same as the throwing speed of the small stones (16);
7) when the equal-diameter steel pipe (1) is turned upwards to see the high-grade concrete (15), stopping pouring the high-grade concrete (15); after the equal-diameter steel pipe (1), the reducing steel pipe (2) and the high-grade concrete (15) in the diameter increasing section steel pipe (3) are finally set, grouting treatment is carried out on a gap between the equal-diameter steel pipe (1) and the steel casing (11) through a grouting pipe (8) outside the equal-diameter steel pipe (1), and after grouting solidification, a steel pipe concrete mixed pile foundation is formed.
CN201810818528.8A 2018-07-24 2018-07-24 Steel pipe concrete mixed pile foundation and construction method Active CN109024651B (en)

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