CN201087411Y

CN201087411Y - Immersed tube filling pedestal pile for construction

Info

Publication number: CN201087411Y
Application number: CNU2007200147444U
Authority: CN
Inventors: 陈宁华; 徐志明
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-09-28
Filing date: 2007-09-28
Publication date: 2008-07-16
Anticipated expiration: 2017-09-28

Abstract

The utility model discloses an immersed tube enlarged pile which is used for construction and applicable for high-rise building foundation projects. The enlarged pile consists of the following structures: steel pipes are arranged outside an upper precast prestressed pile body; cement slurry is arranged between the steel pipes and a pile body, and a convexo concave lower site cast pile body is arranged at the outer surface; the upper precast prestressed pile body is anchored together with the lower site cast pile body via an upper site cast concrete base; the lower steel dowels of the upper precast pile body are arranged inside the upper precast prestressed pile body; the steel dowels of the lower site cast pile body are normal settings and connected with the lower steel dowels of the upper precast pile body embodied at the lower end of the upper precast prestressed pile body. The lower end of the lower site cast pile body is provided with a site cast concrete base, and the longitudinal section of the base is shaped in a trapezoid with a bigger lower part and a smaller upper part. The utility model has the advantages of marked improvement of material strength utilization, and enhancement of single pile carrying capacity, as well as easier achievement of expected design results.

Description

A kind of 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 for building immersed tube bored expanded bore pile 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: the outer setting steel pipe of the precast prestressed pile body of epimere is provided with cement paste between the precast prestressed pile body of steel pipe and epimere; External surface forms the cast-in-place pile body of scraggly hypomere, by last Cast-in-place concrete base precast prestressed pile body of epimere and the cast-in-place pile body anchoring of hypomere are fused, be provided with the following joint bar of epimere precast pile in the precast prestressed pile body of epimere, 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 precast pile in the precast prestressed pile body of epimere lower end, 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 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, the precast prestressed pile body of epimere; 4, the following joint bar of epimere precast pile; 5, the joint bar of cast-in-place pile body; 7, the cast-in-place pile body of hypomere.

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, the epimere pile body is the outer setting steel pipe of the precast prestressed pile body 3 of epimere, between the precast prestressed pile body of steel pipe and epimere cement paste is set, the hypomere pile body is the cast-in-place pile body 7 of hypomere, by last Cast-in-place concrete base 2 precast prestressed pile body 3 of epimere and cast-in-place pile body 7 anchorings of hypomere are fused, be provided with the following joint bar 4 of epimere precast pile in the precast prestressed pile body 3 of epimere, 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 precast pile in the precast prestressed pile body of epimere 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 the precast prestressed pile body 4 of epimere; 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

1. immersed tube bored expanded bore pile for building, it is characterized in that it is to be made of following structure: the outer setting steel pipe of the precast prestressed pile body of epimere (3) is provided with cement paste between the precast prestressed pile body of steel pipe and epimere (3); External surface forms the cast-in-place pile body of scraggly hypomere (7), by last Cast-in-place concrete base (2) precast prestressed pile body of epimere (3) and the cast-in-place pile body of hypomere (7) anchoring are fused, be provided with the following joint bar (4) of epimere precast pile in the precast prestressed pile body of epimere (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 precast pile in the precast prestressed pile body of epimere (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), the vertical section of Cast-in-place concrete base (1) and last Cast-in-place concrete base (2) be down big little trapezoidal.

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 precast prestressed pile body of epimere (3) and the cast-in-place pile body of hypomere (7).