CN101575852A

CN101575852A - Construction method of wall-retaining bottom-expanding sinking-pipe cast-in-situ piles

Info

Publication number: CN101575852A
Application number: CNA200810011388XA
Authority: CN
Inventors: 夏传清
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-05-10
Filing date: 2008-05-10
Publication date: 2009-11-11

Abstract

The invention relates to a construction technology of sinking-pipe piles on a building foundation, in particular to a construction method of wall-retaining bottom-expanding sinking-pipe cast-in-situ piles, using a vibration hammer as a power device. A sinking pipe of the vibration hammer comprises an inner sinking pipe and an outer sinking pipe, and the lower end of a core pipe is provided with a pile tip which extends out of the outer sinking pipe. The construction method of the wall-retaining bottom-expanding sinking-pipe cast-in-situ piles comprises the following steps: firstly, sinking the inner sinking pipe and the outer sinking pipe into a pile position by the vibration hammer, lifting the core pipe, filling a designed amount of bottom-expanding concrete into the outer sinking pipe, lifting the outer sinking pipe without causing the outer sinking pipe to be separated from the bottom-expanding concrete, enabling the vibration hammer to drive the core pipe to repeatedly pound the outer sinking pipe and filling concrete along with concrete expansion until reaching the bottom-expanding requirements; and then, pulling out the core pipe and casting a steel reinforcement cage along the outer sinking pipe for pile-forming operation. The technical scheme overcomes the technical defects of diameter reduction, hole collapse, and the like existing in the prior construction method of sinking-pipe cast-in-situ piles, can be used for the great-load heavy-capacity pile foundation construction of high-rise building engineering and also solves the technical problems of concrete-filling drilling cast-in-situ piles by a long helical pump, such as loosened soil at pile bottoms, and the like occurring in the complex formation operation.

Description

Construction method of wall-retaining bottom-expanding sinking-pipe cast-in-situ piles

Technical field

What the present invention relates to is building foundation bore forming technology.

Background technology

The mechanical execution method of construction work foundation castinplace pile mainly contains vibrations, hammer hidden pipe caisson pile and long spiral infusion pump-grouting concrete two major types at present, the advantage of vibrations, hammer hidden pipe caisson pile makes things convenient in the ground constructing operation, construction costs is low, the ground controllability is strong, can intuitively control construction operation, its shortcoming is that mainly construction stratum such as construction of pile groups and saturated plastic flow plasticity cohesive soil, silt soil can produce soil compaction effect, produces problems such as squeezing stake, broken pile or stake undergauge; In addition, its caliber scope is 325-425mm, and its caliber is limited, is difficult to as load big high building project and the high pile foundation of bearing capacity.The advantage of long spiral infusion pump-grouting concrete is to have overcome unfavorable factors such as undergauge, guaranteed pile quality, improved full system, but its major defect is how to select the drill bit that suits, whole hole to carry bore with cooperating of pumping concrete etc. construction technology all directly influence pile quality and its bearing capacity, especially meet sand, gravel and water yield big than bad ground, its whole hole is returned soil and thoroughly is not prone to the stake end phenomenon of loosening the soil, and has a strong impact on pile quality.So, more than two timber pile types all have the technological deficiency that is difficult to overcome.

Summary of the invention

Be to provide a kind of pile foundation construction, bearing capacity height, easy construction method of wall-retaining bottom-expanding sinking-pipe cast-in-situ piles that is applicable to bad ground as any engineering pile foundation the invention order of patent application of the present invention.The technical scheme of the construction method of wall-retaining bottom-expanding sinking-pipe cast-in-situ piles of patent application of the present invention is the immersed tube power set with the vibration hammer, and its immersed tube is inside and outside double-deck suit immersed tube, and interior pipe is that core pipe lower end is provided with the stake point, and the performing step of this job practices is as follows:

1, core pile tube point leans out outer immersed tube, vibration hammer work, and the inside and outside immersed tube that pin joint is fixing sinks to the stake position, makes the stake end injection designing requirement degree of depth;

2, carry the core pipe, outwards insert design flow in the immersed tube and expand end concrete, on carry outer immersed tube, do not break away from concrete at the bottom of the expansion of inserting to outer immersed tube, drive the core pipe by vibration hammer and insert concrete, until reaching expansion end requirement along outer immersed tube operation, rammer expansion;

3, extract the core pipe, reinforcing cage is thrown in, fixed along outer immersed tube, implement the pile operation.

The disclosed construction method of wall-retaining bottom-expanding sinking-pipe cast-in-situ piles technical scheme of patent application of the present invention, its outer immersed tube has played effective retaining wall effect in the process of a whole set of job practices, water or mud immersion pile effective operation scope in the work progress have promptly been avoided, overcome existing pipe pile settling construction technique and had easily technology disadvantages such as generation undergauge, the hole of collapsing, guaranteed pile quality, and solved existing pipeline sinking pile technology and be subjected to immersed tube caliber restriction and be difficult to be engaged in the big load of high building project, the pile foundation construction of high-bearing capacity; It expands bottom application worker operation, this job practices can be carried out at any complicated geological layer, especially miscellaneous fill layer, solved the stake end loosened soil technical problem that long spiral infusion pump-grouting concrete occurs in the bad ground operation, it has enlarged the stake section, pile capacity improves greatly, makes this job practices can finish the operation of high building project pile foundation construction.This job practices has also continued to continue the pile foundation construction advantage that the pipeline sinking pile technology had is simple to operate, construction costs is low, and also can be used as compound pile base construction method, has improved the composite pile efficiency of construction greatly.

Description of drawings

Fig. 1 is a wall-retaining bottom-expanding sinking-pipe cast-in-situ piles structural representation of the present invention

Fig. 2 to Fig. 5 is the construction sequence figure of an embodiment of job practices of the present invention

Fig. 6 to Fig. 9 is the construction sequence figure of another embodiment of job practices of the present invention.

The specific embodiment

Describe the technology contents of patent application of the present invention in detail below in conjunction with accompanying drawing.

One specific embodiment of the construction method of wall-retaining bottom-expanding sinking-pipe cast-in-situ piles of patent application of the present invention such as block diagram such as Fig. 2, Fig. 3, Fig. 4 and shown in Figure 5, with vibration hammer 1 is the immersed tube power set, its immersed tube is inside and outside double-deck immersed tube, interior pipe, promptly core pipe 2 fixedly is installed in vibration hammer 1 bottom, and outer immersed tube 3 and core pipe 2 be pin joint fixedly, core pipe lower end is provided with flapper pile tip 4, and lean out outer immersed tube, as shown in Figure 2, the operating procedure of this job practices is as follows:

1., driven, core pipe 2 that pin joint is fixing and outer immersed tube 3 together sink to stake, until the core pile tube end injection designing requirement degree of depth by vibration hammer 1;

2., shift out the bayonet lock of fixing outer immersed tube 3 and core pipe 2, promote core pipe 2 along outer immersed tube 3, outside the bottom, insert concrete 5 at the bottom of the expansion of design flow in the immersed tube 3 by core pipe 2 again, as shown in Figure 3 and Figure 4, promote outer immersed tube 3 thereafter, it promotes height and is decided by the amount of concrete 5 at the bottom of the expansion of being filled, but being broken away from, outer immersed tube 3 pipe ends do not expand end concrete 5, driving core pipe 2 by vibration hammer 1 then moves, rams repeatedly to expand to insert and expand end concrete 5 along outer immersed tube 3, core pipe flapper pile tip 4 has closed up at this moment, in this course, outer immersed tube 3 plays the retaining wall effect; Also can be according to the actual requirements when needing to replenish expansion end concrete, the above-mentioned repeatedly again process that develops is until reaching the designing requirement of expanding the end, as shown in Figure 5;

3., extract the core pipe, throw in reinforcing cage along outer immersed tube, fix by design elevation, cast pile concrete, the limit was shaken and was pulled out immersed tube until ground then, finished pile and operated.

Another specific embodiment of the construction method of wall-retaining bottom-expanding sinking-pipe cast-in-situ piles of patent application of the present invention, its block diagram such as Fig. 6, Fig. 7, Fig. 8 and shown in Figure 9, its core pipe 2 pipe ends be set with entity stake point 4 ', as make circular cone entity stake point with manganese steel, its outer immersed tube 3 top sidepieces are provided with the cast hopper 6 that feeds outer immersed tube.The first step of its job practices is identical with the job practices first step of embodiment one; Extract core pipe 2 thereafter, expand the stiff concrete in the end by pouring into design flow in the cast hopper 6 outside immersed tube, as shown in Figure 7, the core pipe is penetrated outer immersed tube again, promote outer immersed tube 3, outer immersed tube pipe end is not broken away from expand the stiff concrete 5 in the end, vibration hammer 1 drives core Guan Zhen and smashes, expand repeatedly develop the stiff concrete 5 in the end to around spread compacted, reach and expand end designing requirement, in this course, outer immersed tube 3 plays the retaining wall effect, as shown in Figure 8 with shown in Figure 9, extract core pipe 2 thereafter, throw in reinforcing cage along outer immersed tube, fix, cast pile concrete by design elevation, the limit was shaken and was pulled out immersed tube until ground then, finished the pile operation.

The construction method of wall-retaining bottom-expanding sinking-pipe cast-in-situ piles of patent application of the present invention can also be at the construction technique of miscellaneous fill soft foundation as composite pile foundation.Its first step is with the first step of above two embodiment, with core Guan Shangti, by outer tube sinking feeding bucket throw in aggregates such as rubble, brickbat or broken concrete, drive core Guan Zhenchong aggregate by vibration hammer repeatedly thereafter, it is compacted that it is spread in soil layer, like this repeatable operation, thus strengthen foundation strength, reach the composite foundation designing requirement after, the core pipe is proposed, throw in reinforcing cage, perfusion pile concrete is finished the composite pile foundation operation.

Claims

1, a kind of construction method of wall-retaining bottom-expanding sinking-pipe cast-in-situ piles is characterized in that with the vibration hammer being the immersed tube power set, and its immersed tube is inside and outside double-deck suit immersed tube, and interior pipe is that core pipe lower end is provided with the stake point, and the performing step of this job practices is as follows:

1., core pile tube point leans out outer immersed tube, vibration hammer work, the inside and outside immersed tube that pin joint is fixing sinks to the stake position, makes a stake end injection designing requirement degree of depth;

2., carry the core pipe, outwards insert design flow in the immersed tube and expand end concrete, on carry outer immersed tube, do not break away from concrete at the bottom of the expansion of inserting to outer immersed tube, drive the core pipe by vibration hammer and insert concrete, until reaching expansion end requirement along outer immersed tube operation, rammer expansion;

3., extract the core pipe, with the outer immersed tube input in reinforcing cage edge, fixing, the operation of enforcement pile.

2, construction method of wall-retaining bottom-expanding sinking-pipe cast-in-situ piles according to claim 1, it is characterized in that core pipe lower end is provided with flapper pile tip, drive by vibration hammer, core pipe that pin joint is fixing and outer immersed tube together sink to the stake position, promote the core pipe thereafter, flapper pile tip scatters, by concrete at the bottom of the expansion of inserting design flow in the outside immersed tube of core pipe, promote outer immersed tube thereafter, outer immersed tube pipe end is not broken away from expand end concrete, close up core pipe pipe end flapper pile tip, vibration hammer drives the core pipe along outer immersed tube operation, ram repeatedly to expand to insert and expand end concrete,, extract the core pipe until reaching the designing requirement of expanding the end, reinforcing cage is thrown in along outer immersed tube, fixing, implement the pile operation.

3, construction method of wall-retaining bottom-expanding sinking-pipe cast-in-situ piles according to claim 1, it is characterized in that core pipe pipe end is set with entity stake point, by vibration hammer inside and outside double-deck immersed tube is together sunk to the stake position to requiring the degree of depth, the core pipe is extracted outer immersed tube, pour into design flow by cast hopper and expand the stiff concrete in the end, promote outer immersed tube, outer immersed tube pipe end is not broken away from expand end concrete, vibration hammer drives core Guan Zhen and smashes, expands and develop end concrete, until reaching the designing requirement of expanding the end, extract the core pipe, reinforcing cage is thrown in, fixed along outer immersed tube, implement the pile operation.

4, according to claim 1,2 or 3 described construction method of wall-retaining bottom-expanding sinking-pipe cast-in-situ piles, it is characterized in that throwing in the outside immersed tube and expand end aggregate, driving the core pipe by vibration hammer repeatedly expands towards aggregate, it is compacted that it is spread in soil layer, after reaching the composite foundation designing requirement, propose the core pipe, throw in reinforcing cage, finish the composite pile foundation operation.