CN200946272Y - Bottom-expanding pile for base construction of architecture - Google Patents

Abstract

The utility model relates to an expanding bottom pile used for construction, in particular to a tube tunnel pre-forming steel concrete expanding bottom pile used for high-rise building base project. An under-plunging bar of the upper pre-forming pile body is arranged in the upper pre-forming pre-stressed pile body; an above-plunging bar of the lower pre-forming pile body and a pre-burying under-plunging bar are arranged in the lower pre-forming pile body. The above-plunging bar of the lower pre-forming pile body is jointed with the under-plunging bar of the upper pre-forming pile body. Then, the upper pre-forming pre-stressed pile body is grappled with the lower pre-forming pile body through the upper present-filling concrete base frame. The base frame center and the pile body center have the same axis. The present-filling base frame is arranged under the lower pre-forming pile body. The section of the upper pre-forming pre-stress pile body and the lower pre-forming pile body are round. The utility model has a wide application range and utilization rate of material intensity is obviously improved. The improved single pile bearing force guarantees tube tunnel expanding bottom piles with expected effects.

Description

The construction foundation working expanded bore pile

Affiliated technical field

The utility model relates to a kind of expanded bore pile for building, particularly relates to a kind of construction foundation working expanded bore pile that is applicable 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.

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 construction foundation working expanded bore pile of the Expected Results of design.

The technical scheme that the utility model technical solution problem is adopted is: ram-expanded pile, it is to be made of following structure: the following joint bar that is provided with the epimere precast pile in the precast prestressed pile body of epimere, be provided with the last joint bar of hypomere precast pile in the hypomere precast pile and bury joint bar in advance, the last joint bar of hypomere precast pile overlaps mutually with the following joint bar of epimere precast pile, by last Cast-in-place concrete base precast prestressed pile body of epimere and the anchoring of hypomere precast pile are fused again, the lower end of hypomere precast pile is provided with the Cast-in-place concrete base, the center of Cast-in-place concrete base and Cast-in-place concrete base is coaxial with hypomere precast pile and the precast prestressed pile body of epimere center, and the cross section of precast prestressed pile body of epimere and hypomere precast pile is circular.

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.

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, the precast prestressed pile body of epimere; 5, the following joint bar of hypomere precast pile; 6, the following joint bar of epimere precast pile; 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 one

As shown in Figure 1 be the main TV structure schematic diagram of the utility model precast pile Cast-in-place concrete base, be provided with the following joint bar 6 of epimere precast pile in the precast prestressed pile body 4 of epimere, 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 last joint bar 9 of hypomere precast pile overlaps mutually with the following joint bar 6 of epimere precast pile, by last Cast-in-place concrete base 2 precast prestressed pile body 4 of epimere and 3 anchorings of hypomere precast pile are fused again, the lower end of hypomere precast pile 3 is provided with Cast-in-place concrete base 1, the center of Cast-in-place concrete base 2 and Cast-in-place concrete base 1 is coaxial with hypomere precast pile 3 and the precast prestressed pile body of epimere 4 centers, and the cross section of precast prestressed pile body 4 of epimere and hypomere precast pile 3 is circular.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.

Claims (2)

1, the construction foundation working expanded bore pile, it is characterized in that it is to be made of following structure: the following joint bar (6) that is provided with the epimere precast pile in the precast prestressed pile body of epimere (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 last joint bar (9) of hypomere precast pile overlaps mutually with the following joint bar (6) of epimere precast pile, by last Cast-in-place concrete base (2) precast prestressed pile body of epimere (4) and hypomere precast pile (3) anchoring are fused again, the lower end of hypomere precast pile (3) is provided with Cast-in-place concrete base (1), the center of Cast-in-place concrete base (2) and Cast-in-place concrete base (1) is coaxial with hypomere precast pile (3) and the precast prestressed pile body of epimere (4) center, and the cross section of precast prestressed pile body of epimere (4) and hypomere precast pile (3) is circular.

2, construction foundation working expanded bore 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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