CN201087351Y - Anti-impact immersed tube filling pedestal pile for construction - Google Patents

Abstract

The utility model relates to an impact-force-resistance construction-using pipe-sunk casting bottom-expanded pile applied to a high-building ground project. The bottom-expanded pile consists of the following structures that the upper section is a steel pipe, the inside of the steel pipe is provided with concrete, the external surface forms a scraggy lower-section cast-in-situ pile body, the upper-section precast prestress pile body and the lower-section cast-in-situ pile body are anchored to an integral body through an upper cast-in-situ concrete base, downward steel dowels are arranged in the upper-section steel pipe, the steel dowels of the cast-in-situ pile body of the lower-section cast-in-situ pile body are arranged normally and are overlapped with the preembedded downward steel dowels of the upper-section steel pipe at the lower end of the upper-section steel pipe, and the lower end of the lower-section cast-in-situ pile body is provided with a cast-in-situ concrete base. The utility model obviously increases the material strength availability and the impact force resistance, the single pile bearing capacity is higher, and the expected effect of the design is easily achieved.

Description

A kind of anti-impact force immersed tube bored expanded bore pile for building

Technical field

The utility model relates to a kind of expanded bore pile for building, particularly relates to a kind of anti-impact force immersed tube bored expanded bore pile for building that is applicable in the highrise building foundation engineering and is applicable to 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, pile body of the prior art in use exists bearing capacity and the more weak problem of anti-impact force.

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 for building immersed tube bored expanded bore pile of the Expected Results of design, has solved pile body in use bearing capacity and the more weak problem of anti-impact force.

The technical scheme that the utility model technical solution problem is adopted is: epimere is set to steel pipe, and concrete is set in the steel pipe; External surface forms the cast-in-place pile body of scraggly hypomere, by last Cast-in-place concrete base epimere steel pipe and the cast-in-place pile body of hypomere are fused, be provided with down joint bar in the epimere steel pipe, the joint bar of the cast-in-place pile body of the cast-in-place pile body of hypomere be usually be provided with and with the following joint bar overlap joint of the pre-buried epimere steel pipe in epimere steel pipe lower end, the lower end of the cast-in-place pile body of hypomere is provided with the Cast-in-place concrete base.

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

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.

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, epimere steel pipe; 4, the following joint bar of epimere steel pipe; 5, the joint bar of cast-in-place pile body; 7, the cast-in-place pile body of hypomere, 8, concrete.

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 set to steel pipe 3, steel duct is provided with concrete eight, the hypomere pile body is the cast-in-place pile body 7 of hypomere, by last Cast-in-place concrete base 2 epimere steel pipe 3 and the cast-in-place pile body 7 of hypomere are fused, be provided with the following joint bar 4 of epimere steel pipe in the epimere steel pipe 3, the joint bar 5 of the cast-in-place pile body of the cast-in-place pile body 7 of hypomere be usually be provided with and with following joint bar 4 overlap joints of the pre-buried epimere steel pipe in epimere steel pipe 3 lower ends, 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 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. anti-impact force immersed tube bored expanded bore pile for building, it is characterized in that it is to be made of following structure: epimere is set to steel pipe (3), and concrete (8) is set in the steel pipe; External surface forms the cast-in-place pile body of scraggly hypomere (7), by last Cast-in-place concrete base (2) epimere steel pipe (3) and the cast-in-place pile body of hypomere (7) are fused, be provided with the following joint bar (4) of epimere steel pipe in the epimere steel pipe (3), the joint bar (5) of the cast-in-place pile body of the cast-in-place pile body of hypomere (7) be usually be provided with and with following joint bar (4) overlap joint of the pre-buried epimere steel pipe in epimere steel pipe (3) lower end, the lower end of the cast-in-place pile body of hypomere (7) is provided with Cast-in-place concrete base (1).

2. according to claim 1 immersed tube bored expanded bore pile for building, it 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 epimere steel pipe (3) and the cast-in-place pile body of hypomere (7).