CN201137090Y - Pipe caisson club-footed pile - Google Patents

Abstract

The utility model relates to a ram-expanded pile adapted for high-rise building foundation engineering, which structurally includes that the upper section utilizes a steel pipe, concrete is installed in the steel pipe, upper inserted reinforcements and embedded lower inserted reinforcements of a lower section precast pile body are mounted inside the lower section precast pile body, the upper section steel pipe and the lower precast pile body are integrally anchored by an upper cast-in-place concrete base, the joint of the upper section steel pipe and the lower section precast pile body is provided with cross stabilizing reinforcements, the lower end of the lower section precast body is provided with a cast-in-place concrete base, and cross sections of the upper section steel pipe and the lower section precast pile body are rectangles. The ram-expanded pile adapted for high-rise building foundation engineering has wide scope of application, remarkably improves material strength utilization ratio, strengthens the bearing capacity and anti-impact capacity of the pile joint in usage process of the belled pile, and has high stability.

Description

Ram-expanded pile

Technical field

The utility model relates to a kind of expanded bore pile for building, and particularly relating to a kind of being applicable to is ram-expanded pile in the highrise building foundation engineering.

Background technology

The pile foundation engineering that is used for the high building lot of highrise building and requirement for bearing capacity at present generally adopts three kinds of ram-expanded pile, preformed pile and large diameter bored piles.Wherein the large diameter bored pile bearing capacity is the highest, but its involve great expense, work efficiency is low, and is and seriously polluted during construction; The quality of preformed pile is good, bearing capacity is also higher, but the cost of preformed pile is also high at present, generally is used for the higher building of safe class.What wherein be most widely used is ram-expanded pile, and this pile body is a cast-in-situ steel concrete, and pile crown is prefabricated; When executing, earlier the prefabricated pile crown of immersed tube is imbedded the hardpan in the ground, irritate concrete cast pile then; But because the soil property age difference that the earth's crust forms, soft foundation is soft usually with the increase of the crust layer degree of depth, hardpan is alternately state, like this when continuous piling construction, after execute stake and can produce extruding soil layer, the stake that will have influence on perfusion formerly and not solidify fully as yet, especially especially serious at the intersection of weak soil layer and hardpan, broken pile often appears, necking, thereby cause having approximately can't meet the quality requirement of tube-sinking cast-in-situ pile about 20%, force the designer to reduce the standard of bearing capacity of single pile, cause down stake to be gathered, cause soil body gross distortion, even jeopardize the quality of pile body; This another shortcoming is that bearing capacity is low, be to increase bearing capacity, the general way that adopts at the bottom of after irritating concrete cast pile body, adding companding, but because of its utilization add companding at the bottom of mode make the uncertain and standard of its shape size, its application is limited to.Though the utility model patent of the ram-expanded pile that the inventor has applied for has solved the problems referred to above, find that in actual use the junction of pile body exists bearing capacity and anti-impact force is weak, the problem of steadiness difference.

The utility model content

The problem that the utility model exists at prior art, and provide a kind of scope of application wide, obviously improve strength of materials utilization rate, bearing capacity of single pile is higher and reach the ram-expanded pile of the Expected Results of design, and solved that pile body of the prior art junction bearing capacity and anti-impact force are weak, the problem of steadiness difference, and easy for operation, reduced cost.

The technical scheme that the utility model technical solution problem is adopted is: epimere adopts steel tubular structure, be provided with concrete in the steel pipe, be provided with the last joint bar of hypomere precast pile in the hypomere precast pile and bury joint bar in advance, the hypomere precast pile fuses epimere steel pipe and hypomere precast pile by last Cast-in-place concrete base, the junction of epimere steel pipe and hypomere precast pile is provided with the firm muscle of chiasma type, the lower end of hypomere precast pile is provided with the Cast-in-place concrete base, and the cross section of epimere steel pipe and hypomere precast pile is a rectangle.

Concrete in the described steel pipe is filled to rectangle or sharpening triangle.

Described vertical section of going up Cast-in-place concrete base and Cast-in-place concrete base be big down little trapezoidal.

The utility model adopts the more piece pile body and expands base more than two, because the performance to the lower bottom base bearing capacity of upper bed-plate produces good influence, being provided with the performance of each section pile body frictional resistance of each base is favourable, make stake be in the state work down of economical rationality all the time, obviously improve the bearing capacity of single pile and the utilization rate of the strength of materials, reach the Expected Results of design easily, satisfy the needs of construction work better, no matter simultaneously applied widely is high level or low-rise building, safe class and ground soil property situation can both be combined into the immersed tube prefabricated multistage under-reamed pile that is complementary with it.And improved the steadiness of pile body junction.

Description of drawings

Fig. 1 is the main TV structure schematic diagram of precast pile of the present utility model.

Among the figure: 1, Cast-in-place concrete base; 2, go up the Cast-in-place concrete base; 3, hypomere precast pile; 4, epimere steel pipe; 5, firm muscle; 9, the last joint bar of hypomere precast pile; 10, bury joint bar in advance.

The specific embodiment

Embodiment of the present utility model is described in detail in conjunction with the accompanying drawings, but protection domain of the present utility model is not limit by embodiment.

Embodiment 1

As shown in Figure 1 be the main TV structure schematic diagram of the utility model precast pile Cast-in-place concrete base, epimere adopts steel pipe 4 structures, be provided with the sharpening triangular concrete in the steel pipe 4, be provided with the last joint bar 9 of hypomere precast pile in the hypomere precast pile 3 and bury joint bar 10 in advance, the hypomere precast pile fuses epimere steel pipe 4 and hypomere precast pile 3 by last Cast-in-place concrete base 2, the junction of epimere steel pipe 4 and hypomere precast pile 3 is provided with the firm muscle 5 of chiasma type, the lower end of hypomere precast pile 3 is provided with Cast-in-place concrete base 1, and the cross section of epimere steel pipe 4 and hypomere precast pile 3 is a rectangle.The vertical section of last Cast-in-place concrete base 2 and Cast-in-place concrete base 1 be down big little trapezoidal.The job practices of present embodiment can be constructed according to common process.

Embodiment 2

Be provided with Rectangular Concrete in the described epimere steel pipe 4, other structure is with embodiment 1.

Claims (3)

1, ram-expanded pile, it is characterized in that it is to be made of following structure: epimere adopts steel pipe (4) structure, be provided with concrete in the steel pipe, be provided with the last joint bar (9) of hypomere precast pile in the hypomere precast pile (3) and bury joint bar (10) in advance, the hypomere precast pile fuses epimere steel pipe (4) and hypomere precast pile (3) by last Cast-in-place concrete base (2), the junction of epimere steel pipe (4) and hypomere precast pile (3) is provided with the firm muscle of chiasma type (5), the lower end of hypomere precast pile (3) is provided with Cast-in-place concrete base (1), and the cross section of epimere steel pipe (4) and hypomere precast pile (3) is a rectangle.

2, ram-expanded pile according to claim 1 is characterized in that the concrete in the described steel pipe (4) is filled to rectangle or sharpening triangle.

3, ram-expanded pile according to claim 1 is characterized in that described vertical section of going up Cast-in-place concrete base (2) and Cast-in-place concrete base (1) is little trapezoidal big down.

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