CN2730940Y

CN2730940Y - Cast in situ pile of prefabricated reinforced concrete

Info

Publication number: CN2730940Y
Application number: CN 200420082139
Authority: CN
Inventors: 陈忠
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-08-24
Filing date: 2004-08-24
Publication date: 2005-10-05
Anticipated expiration: 2014-08-24

Abstract

The utility model discloses a cast in situ pile of prefabricated reinforced concrete. The upper and lower ends of the reinforced steel bar frame comprising a longitudinal reinforced steel bar and the band steel bar are welded with steel plates and cast by concrete to form a prefabricated pile, a plurality of sections of prefabricated piles are overlapped and welded and then sink down one by one. The utility model is characterized in that the slurry casting pipes left by a plurality of sections of pile cores buried beforehand form an overlapped cavity together with the holes left by the sunken upper and lower end parts of the prefabricated piles to ensure the whole piles and the long slurry casting pipes to be interpenetrated. This design is a new pile which is the combination of the single reinforced concrete pile and the situ pile, so the bearing capacity of the prefabricated pile is improved from 15% to 50%, and the cost for the construction is decreased from 10% to 35%, the construction speed is improved, the quality of the pile base is enhanced to reach the basic requirement of the high building, and the utility model also adds new product of the prefabricated piles produced by the industry.

Description

Prefabricated reinforced concrete stake heart post grouting pile

Technical field

The utility model relates to the pile foundation of the steel bar concrete preformed pile of building in the civil construction project, especially the stake of prefabricated reinforced concrete stake heart grouting behind shaft or drift lining.

Background technology

The steel bar concrete preformed pile is a kind of stake type commonly used of reliable quality in civil construction project, by widespread usage in building pile foundation, rise along with highrise building, the bearing capacity value of single steel bar concrete preformed pile has not satisfied the requirement of Pile Foundation, in order to satisfy the requirement of highrise building pile capacity value, common engineering is with the method for underpin or the method for engineering piling, but this methods engineering involves great expense, the density that lays out pile is excessive, when stake is passed through soil layer and is saturated soft ground, all building of neighbour and underground utilities influence are strengthened, the engineering application of steel bar concrete preformed pile is restricted.

Summary of the invention

Technical problem to be solved in the utility model is to overcome the defective of prior art and provides a kind of bearing capacity value, a minimizing number, reduction that improves stake to lay out pile density, minimizing soil compaction to adjacent all prefabricated reinforced concrete stake heart post grouting piles that influences, makes construction costs reduction, raising pile foundation engineering quality.

Technical problem of the present utility model realizes by following technical proposal.

Prefabricated reinforced concrete stake heart post grouting pile, it comprises by longitudinal reinforcement and stirrup and forms cage of reinforcement, upper and lower end solid welding steel plate at cage of reinforcement, and fluid concrete forms prefabricated pile cutoff, the prefabricated pile cutoff of more piece forms the stake of spreading anchor pole by the superimposed welding of joint and by the joint pile sinking, the Grouting Pipe that it is characterized in that the pre-buried welding grouting behind shaft or drift lining of the stake heart of the prefabricated pile cutoff of described every joint, and, after making the prefabricated pile cutoff of upper and lower joint superimposed, this heavy hole forms the chamber that connects the long Grouting Pipe of full stake in the heavy hole of upper and lower end reservation of prefabricated pile cutoff.

Described steel plate end face is provided with the groove that the stake end is reinforced, and groove is welded into weld seam.

Described steel plate end face is provided with the notch of a Zhou Jiagu.

Described notch is recessed round shape, and radially " ten " word distributes.

Compared with prior art, the utility model has been introduced stake heart slurry injection technique with the routine techniques of single steel bar concrete preformed pile, becomes the novel stake of two kinds of technology unifications, has fully excavated preformed pile bearing capacity performance and potentiality, the bearing capacity value of stake is increased substantially, pass through field testing; Bearing course at pile end is a sandy soil, and bearing capacity value can improve 40～50%; Bearing course at pile end is a silt, and bearing capacity value can improve 25～35%; Bearing course at pile end is a cohesive soil, bearing capacity value can improve 15～25%, because the bearing capacity value of stake increases substantially, reinforce the stake number thereby can reduce, construction costs reduces by 10～35%, accelerates speed of application, improves pile foundation quality, can reach the Pile Foundation requirement, the preformed pile of producing for batch production has increased new varieties simultaneously.

Description of drawings

Fig. 1 is the anchor pole stake lateral view behind the prefabricated pile cutoff welding of the utility model spreading.

Fig. 2 is the A-A sectional view of Fig. 1.

Fig. 3 is the B-B sectional view of Fig. 1.

Fig. 4 is the C-C sectional view of Fig. 3.

Fig. 5 is the D-D sectional view of Fig. 3.

The specific embodiment

Below in conjunction with above-mentioned accompanying drawing embodiment the utility model is described in detail again.

Referring to Fig. 1～5, prefabricated reinforced concrete stake heart post grouting pile is formed cage of reinforcement by longitudinal reinforcement 8 and stirrup 9, on cage of reinforcement, lower end solid welding steel plate 3, Grouting Pipe 2 at the pre-buried welding grouting behind shaft or drift lining of the stake heart, Grouting Pipe is 2.5 centimetres of diameters, the metal tube that length is shorter 3 centimetres than pile cutoff length, form prefabricated pile cutoff 1 with the concrete pouring cage of reinforcement, before fluid concrete, on each pile cutoff, 5 centimetres of diameters are reserved in the bottom, the heavy hole 6 that the degree of depth is 4 centimetres, should form chamber 4 in heavy hole behind pile cutoff and pile cutoff spreading, its effect is on adjusting, following Grouting Pipe butt joint deviation, guarantee that the long Grouting Pipe of full stake connects.

According to whole pile length requirement, the prefabricated pile cutoff 1 that is embedded with Grouting Pipe 2 by more piece is by in the superimposed welding of joint, the steel plate 3 that saves the end down forms, and by joint employing hammering or static pressure method pile sinking, concrete construction technology is an example with the static pressure anchor rod stake: utilize the deadweight of reinforcing main body as the pile sinking counter-force, in the basis that reinforces main body, bury anchor pole underground, steel door frame is connected with anchor pole, in the stake hole that the steel door frame center is reserved, insert preformed pile section 1, with hydraulic jack prefabricated pile cutoff static pressure is buried, hanging in second section prefabricated pile cutoff buries with the superimposed welding continuation of following pile cutoff end face static pressure, bury until designing the whole static pressure of pile cutoff, the stake top forms integral body with the basis with concrete casting, finishes the static pressure anchor rod pile driving construction.Carry out then Grouting Pipe 2 is injected cement grout, it is 0.8～1 that cement grout requires the ratio of water and cement, determines cement consumption by the bearing capacity value of estimating stake, and passes through soil layer property according to stake and select reinforcing stake end soil layer or all each layer soil of stake.

Reinforce stake end soil layer as need: the two ends steel plate 3 of prefabricated pile cutoff 1 is processed into the groove of chamfering shape, is welded into weld seam 5 along all grooves of stake, only stays grout outlet at the bottom of stake.Reinforce pile soil horizon as need: the end face of the two ends steel plate 3 of prefabricated pile cutoff 1 is processed into the notch 7 as Fig. 5, and this notch is recessed round shape, and radially " ten " word distributes, with this notch as staying grout outlet.As requiring to reinforce stake end soil layer and pile soil horizon simultaneously; Then carry out processing of steel plate groove and notch processing simultaneously, reserve the grout outlet in stake end and stake week simultaneously.

Claims

1, prefabricated reinforced concrete stake heart post grouting pile, it comprises by longitudinal reinforcement (8) and stirrup (9) and forms cage of reinforcement, on cage of reinforcement, lower end solid welding steel plate (3), and fluid concrete forms prefabricated pile cutoff (1), the prefabricated pile cutoff of more piece forms the stake of spreading anchor pole by the superimposed welding of joint and by the joint pile sinking, the Grouting Pipe (2) that it is characterized in that the pre-buried welding grouting behind shaft or drift lining of the stake heart of the prefabricated pile cutoff of described every joint (1), and on prefabricated pile cutoff, heavy hole (6) is reserved in the bottom, and this heavy hole makes, save the superimposed back of prefabricated pile cutoff down and form the chamber (4) that connects the long Grouting Pipe of full stake.

2, prefabricated reinforced concrete stake heart post grouting pile according to claim 1 is characterized in that described steel plate (3) end face is provided with the groove that the stake end is reinforced, and groove is welded into weld seam (5).

3, prefabricated reinforced concrete stake heart post grouting pile according to claim 1 is characterized in that described steel plate (3) end face is provided with the notch (7) of a Zhou Jiagu.

4, prefabricated reinforced concrete stake heart post grouting pile according to claim 3 is characterized in that described notch (7) is recessed round shape, and radially " ten " word distributes.