CN201137062Y - Pipe caisson pouring club-footed pile - Google Patents

Abstract

The utility model discloses a belled pile for buildings, in particular relating to a driven cast-in-place belled pile in foundation engineering of a high-rise building. The driven cast-in-place belled pile is formed by the structure as follows: an upper section is equipped with a steel pipe, a lower section is equipped with a cast-in-place pile with a knaggy outer surface, the steel pipe of the upper section is integrally anchored with the cast-in-place pile body of the lower section via an upper cast-in-place concrete base, stabilizing reinforcements are arranged at the connection position of the steel pipe of the upper section and the cast-in-place pile body of the lower section, lower inserted reinforcements of the steel pipe of the upper section are disposed in the steel pipe of the upper section, upper inserted reinforcements of the cast-in-situ of the lower section are in normal arrangement and are connected with the lower inserted reinforcements of the steel pipe of the upper section which are embedded at the lower end of the steel pipe of the upper end, the lower end of the cast-in-place of the lower section is equipped with a cast-in-place concrete base, the cast-in-place concrete base and a longitudinal section of the upper cast-in-place concrete base are in big end down trapezoid. The driven cast-in-place belled pile is wide in application range, obviously increases material strength usage, strengthens bearing capacity and anti-impact force in using process of the pedestal pile body, and increases stability.

Description

Immersed tube bored expanded bore pile

Technical field

The utility model relates to a kind of expanded bore pile for building, particularly relates to a kind ofly being applicable in the highrise building foundation engineering and being applicable to immersed tube bored expanded bore pile in the building of other any ground soil properties, safe class.

Background technology

The pile foundation engineering that is used for the high building lot of highrise building and requirement for bearing capacity at present is general to adopt three kinds of immersed tube bored expanded bore 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.

In addition, the pile body junction of expanded bore pile, in actual use the ability of bearing capacity and anti-impact force relative a little less than, steadiness is relatively poor.

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 immersed tube bored expanded bore pile of the Expected Results of design, has solved the existing expanded bore pile pile body junction problem of relative weak, the steadiness difference with anti-impact force of bearing capacity in use.

The technical scheme that the utility model technical solution problem is adopted is: a kind of immersed tube bored expanded bore pile, it is to be made of following structure: epimere is set to steel pipe, hypomere is the scraggly cast-in-place pile body of external surface, by last Cast-in-place concrete base epimere steel pipe and the cast-in-place pile body anchoring of hypomere are fused, the internal connection of epimere steel pipe and the cast-in-place pile body of hypomere is provided with the firm muscle of chiasma type, the joint bar of the cast-in-place pile body of the cast-in-place pile body of hypomere is to be provided with usually, the lower end of the cast-in-place pile body of hypomere is provided with the Cast-in-place concrete base, the vertical section of Cast-in-place concrete base and last Cast-in-place concrete base be down big little trapezoidal.

The center of described Cast-in-place concrete base and last Cast-in-place concrete base is coaxial with the center of epimere steel pipe and the cast-in-place pile body of hypomere.

The utility model adopts plurality of sections of steel pipes to be connected with 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 the epimere of expanded bore pile adopts steel pipe, has strengthened expanded bore pile bearing capacity and anti-impact force in use.The pile body junction is provided with firm muscle, has strengthened steadiness.

Description of drawings

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

Among the figure: 1, Cast-in-place concrete base; 2, go up the Cast-in-place concrete base; 3, epimere steel pipe; 5, the joint bar of cast-in-place pile body; 7, the cast-in-place pile body of hypomere, 9, firm muscle.

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.

As shown in Figure 1, epimere is a steel pipe 3, hypomere is cast-in-place pile body 7, by last Cast-in-place concrete base 2 epimere steel pipe 3 and cast-in-place pile body 7 anchorings of hypomere are fused, the internal connection of the cast-in-place pile body 7 of epimere steel pipe 3 and hypomere is provided with the firm muscle 9 of chiasma type, the joint bar 5 of the cast-in-place pile body of the cast-in-place pile body 7 of hypomere is to be provided with usually, and the lower end of the cast-in-place pile body 7 of hypomere is provided with Cast-in-place concrete base 1.Make the external surface of the cast-in-place pile body 7 of its hypomere form scraggly surface with the soil compaction method, can also be provided with two-stage or multistage prefabricated or cast-in-place pile body as required in the upper end of epimere steel pipe 4; The vertical section of Cast-in-place concrete base 1 and last Cast-in-place concrete base 2 be down big little trapezoidal.

The shape of Cast-in-place concrete base 1 and last Cast-in-place concrete base 2 is not limit, and its vertical section is a kind of in the up-small and down-big trapezoidal or sharpening triangle.

Claims (2)

1, a kind of immersed tube bored expanded bore pile, it is characterized in that it is to be made of following structure: epimere is set to steel pipe (3), hypomere is the scraggly cast-in-place pile body of external surface (7), by last Cast-in-place concrete base (2) epimere steel pipe (3) and the cast-in-place pile body of hypomere (7) anchoring are fused, the internal connection of epimere steel pipe (3) and the cast-in-place pile body of hypomere (7) is provided with the firm muscle of chiasma type (9), the joint bar (5) of the cast-in-place pile body of the cast-in-place pile body of hypomere (7) is to be provided with usually, the lower end of the cast-in-place pile body of hypomere (7) is provided with Cast-in-place concrete base (1), the vertical section of Cast-in-place concrete base (1) and last Cast-in-place concrete base (2) be down big little trapezoidal.

2, immersed tube bored expanded bore pile according to claim 1 is characterized in that the center of described Cast-in-place concrete base (1) and last Cast-in-place concrete base (2) is coaxial with the center of cast-in-place pile body of epimere (3) and the cast-in-place pile body of hypomere (7).

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