CN101173515B

CN101173515B - Steel pipe pile foundation built by planting steel stick and building method thereof

Info

Publication number: CN101173515B
Application number: CN2007101685152A
Authority: CN
Inventors: 杨齐海; 王喜良; 高兴泽; 王鹤; 张国刚; 杨先权
Original assignee: China Railway Major Bridge Engineering Co Ltd
Current assignee: China Railway Major Bridge Engineering Group Co Ltd MBEC
Priority date: 2007-11-29
Filing date: 2007-11-29
Publication date: 2010-09-08
Anticipated expiration: 2027-11-29
Also published as: CN101173515A

Abstract

The invention discloses a steel pipe pile foundation constructed by planting steel bars and the construction method of the foundation, which is characterized in that at least one steel bar is partly planted into a base rock, the steel pipe is sleeved outside the steel bar, underwater concrete is poured into the steel pipe to connect the steel pipe and the steel bar as a whole; part of the steel bar is fixedly connected with the base rock, the steel bar outside the base rock is arranged in the steel pipe, the steel pipe and the steel bar are connected as a whole to form the steel pipe pile foundation. The method solved the problem that the steel pipe pile foundation on the underwater base rock surface is hard to be driven into the rock stratum by sufficient depth, thus the stability of the pile body is hard to be ensured; the problem is solved with relatively less amount of construction, the complex construction of the steel pipe pile foundation on the underwater base rock surface is relatively simplified, the quality of the steel pipe pile foundation is ensured. The steel pipe pile foundation has the advantages of novelty, simplification, and applicability to the construction of steel pipe pile foundation on the underwater shallow coverage layer and the uncovered base rock.

Description

Steel pipe pile basis and construction method thereof that planting steel stick is built

Technical field

The invention belongs to pile foundation and job practices thereof, be specifically related to steel pipe pile basis and job practices thereof on a kind of shallow covering layer or the exposed basement rock under water.

Background technology

Build the steel pipe pile basis in the riverbed, generally adopt driven pile, promptly adopt piling machinery that steel pipe is squeezed into the certain degree of depth in riverbed, this moment, steel pipe pile can rely on the stake end and pile body ground on every side bearing capacity to be provided, also to keep stable.But in the riverbed of exposed bedrock, because the extremely shallow or intectate of covering layer, steel pipe pile is difficult to squeeze into the enough degree of depth in rock stratum again, so the stability of pile body is difficult to ensure.

Summary of the invention

The object of the present invention is to provide a kind of steel pipe pile basis and job practices thereof that can guarantee that planting steel stick stable on shallow under water covering layer of steel pipe pile or the exposed basement rock is built, to address the above problem.

Technical scheme of the present invention is: planting steel stick is built the method on steel pipe pile basis, it is to offer core-drawing hole in basement rock, at least one rod iron partly planted in the core-drawing hole of basement rock, with steel pipe socket outside rod iron, underwater concrete is poured in steel pipe bottom and the core-drawing hole, makes steel pipe and rod iron and basement rock connect into integral body.

Here the interior rod iron quantity of steel pipe pile can be one or more, arranges evenly that in steel pipe pile the rod iron diameter is selected according to the steel pipe pile force request, and rod iron should be selected the profile strong with grip of concrete for use.

Two of technical scheme of the present invention is: it is partly to be connected and fixed with rod iron in the basement rock, and the outer rod iron of basement rock is located in the steel pipe, and steel pipe and rod iron connect into integrally formed steel pipe pile basis.

This method has solved under water that the steel pipe pile basis is difficult to squeeze into the enough degree of depth in rock stratum on the bedrock surface, so the stability of pile body is difficult to construction difficult problems such as guarantee; Solve problem by less relatively construction volume, steel pipe pile foundation construction on the bedrock surface under water of complexity is oversimplified relatively, guarantee the steel pipe pile mass of foundation.The steel pipe pile basis of this structure is novel, simple; Be applicable to the steel pipe pile foundation construction on shallow covering layer or the exposed basement rock under water.

Description of drawings

Fig. 1 planting steel stick is built steel pipe pile foundation structure schematic diagram.

Fig. 2～Fig. 5 planting steel stick is built the construction sequence schematic diagram on steel pipe pile basis.

The specific embodiment

Present embodiment is used for the explanation to claim of the present invention, and protection scope of the present invention is not limited to the following example.

As shown in Figure 1, be connected and fixed with rod iron 2 parts in the basement rock 5, basement rock 5 outer rod irons 2 are located in the steel pipe 3, and steel pipe 3 connects into integrally formed steel pipe pile basis with rod iron 2 by underwater concrete 4.Offer core-drawing hole 1 on basement rock 5, the diameter of core-drawing hole 1 is inserted in rod iron 2 in the core-drawing hole 1 greater than rod iron 2 diameters, and the diameter of core-drawing hole 1 is less than steel pipe 3 internal diameters.

Its construction sequence is as follows:

As Fig. 2, on basement rock, drill through core-drawing hole 1 with light-duty geological drilling rig;

As Fig. 3, in core-drawing hole 1, plant rod iron 2 under water by the diver;

Stable for rod iron, can between rod iron 2 and hole 1 wall, establish rod iron fastening devices 6.Rod iron fastening devices 6 can be a fixation fork, and fixed bar etc. can make rod iron fixing part or assembly.

As Fig. 4, under diver's the assistance steel pipe 3 is being socketed in the periphery of rod iron 2 and standing on the riverbed face;

As Fig. 5, adopt pouring underwater concrete 4 in vertical conduit normal direction steel pipe 3 bottoms and the core-drawing hole 1; Pouring underwater concrete is in steel pipe bottom and core-drawing hole.The steel pipe 2 outer underwater concretes of building are connected steel pipe 2 peripheries with basement rock 5

When treating that underwater concrete 4 reaches design strength, rock foundation firmly can be connected with steel pipe 3 by rod iron 2, form the steel pipe pile basis.The vertical bearing capacity of this pile foundation by rock foundation provide, horizontal bearing capacity provides jointly by rod iron 2 and underwater concrete 4.

The single steel pipe pile technical data of construction in case history of planting: the core-drawing hole diameter is 8.0～12.0cm, hole depth 1.0～2.0m; Rod iron diameter 30.050.0mm, long 3.0～4.0m can place 1～3 in the every steel pipe; Steel pipe is plain edition steel pipes with straight or spiral steel pipe, diameter 500.0～1000.0mm; Underwater concrete is with C30 and above pea gravel concreten, and cobble-stone diameter 5.0～20.0mm also can adopt mortar, can mix an amount of early strength admixture in concrete or mortar.

Claims

1. a planting steel stick is built the method on steel pipe pile basis, it is to offer core-drawing hole on basement rock, at least one rod iron partly planted in the core-drawing hole of basement rock, with steel pipe socket outside rod iron, underwater concrete is poured in the bottom and core-drawing hole of steel pipe, makes steel pipe and rod iron and basement rock connect into integral body.

2. planting steel stick is built the method on steel pipe pile basis according to claim 1, it is characterized in that building underwater concrete and be connected with steel pipe with basement rock rod iron is peripheral in steel pipe.

3. planting steel stick is built the method on steel pipe pile basis according to claim 1, it is characterized in that described core-drawing hole diameter greater than the rod iron diameter, and the core-drawing hole diameter is less than pipe diameter, and steel pipe stands on the riverbed bedrock surface.

4. build the method on steel pipe pile basis as planting steel stick as described in the claim 3, it is characterized in that establishing between rod iron and the hole wall rod iron fastening devices.

5. the planting steel stick steel pipe pile basis of building, it is partly to be connected and fixed with rod iron in the basement rock, and the outer rod iron of basement rock is located in the steel pipe, and steel pipe and rod iron connect into integrally formed steel pipe pile basis.

6. build the steel pipe pile basis as planting steel stick as described in the claim 5, it is characterized in that the steel pipe and the bedrock surface on described steel pipe pile basis connects into integral body by underwater concrete.

7. build the steel pipe pile basis as planting steel stick as described in the claim 5, it is characterized in that pouring underwater concrete connects into integral body with steel pipe and rod iron in the steel pipe.

8. build the steel pipe pile basis as planting steel stick as described in the claim 5, it is characterized in that offering core-drawing hole on basement rock, the core-drawing hole diameter is inserted in rod iron in the core-drawing hole greater than the rod iron diameter, and the core-drawing hole diameter is less than pipe diameter, and steel pipe stands on the riverbed bedrock surface.

9. build the steel pipe pile basis as planting steel stick as described in the claim 8, it is characterized in that pouring underwater concrete is in steel pipe bottom and core-drawing hole.