CN101666088A - Construction method of large-diameter expanded bore pile based on PCC pile - Google Patents
Construction method of large-diameter expanded bore pile based on PCC pile Download PDFInfo
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- CN101666088A CN101666088A CN200910183524A CN200910183524A CN101666088A CN 101666088 A CN101666088 A CN 101666088A CN 200910183524 A CN200910183524 A CN 200910183524A CN 200910183524 A CN200910183524 A CN 200910183524A CN 101666088 A CN101666088 A CN 101666088A
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- 238000010276 construction Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 30
- 239000002689 soil Substances 0.000 claims abstract description 27
- 239000004567 concrete Substances 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000012423 maintenance Methods 0.000 claims abstract description 7
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 14
- 238000004080 punching Methods 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 5
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- 230000008439 repair process Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 7
- 229910000831 Steel Inorganic materials 0.000 abstract description 3
- 239000010959 steel Substances 0.000 abstract description 3
- 238000011010 flushing procedure Methods 0.000 abstract 1
- 201000003352 adrenal gland pheochromocytoma Diseases 0.000 description 52
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000009412 basement excavation Methods 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 235000016936 Dendrocalamus strictus Nutrition 0.000 description 1
- 241001515806 Stictis Species 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000011178 precast concrete Substances 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
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Abstract
本发明公开了一种基于PCC桩的大直径扩底桩施工方法，主要步骤包括先进行PCC桩施工和养护，再采用高压水冲将桩芯土取出，并取出部分桩底土，在PCC桩桩底形成扩底，然后下放钢筋笼、浇注混凝土，形成大直径扩底桩。本发明方法将PCC桩与大直径扩底桩结合形成新桩型，技术成熟，比普通的大直径扩底桩具有更大的承载力，且本发明方法施工效率高、安全性好。
The invention discloses a construction method of large-diameter bottom-expanding piles based on PCC piles. The main steps include firstly carrying out the construction and maintenance of PCC piles, and then using high-pressure water flushing to take out the pile core soil, and take out part of the bottom soil of the piles. The bottom is formed to expand the bottom, and then the steel cage is lowered and concrete is poured to form a large-diameter expanded bottom pile. The method of the invention combines PCC piles with large-diameter expanded-bottom piles to form a new pile type. The technology is mature, and it has greater bearing capacity than ordinary large-diameter expanded-bottom piles. The method of the invention has high construction efficiency and good safety.
Description
Technical field
The present invention relates to a kind of job practices of pile foundation, particularly a kind of major diameter pedestal pile constructing process based on the PCC stake.
Background technology
China is vast in territory, and weak soil distributes very wide, and coastal area, particularly Yangtze River Delta Region exist the soft foundation of many complexity.When on soft foundation, building works such as highrise building, bridge, generally all to adopt pile foundation.Pile foundation generally all will be passed weak soil layer, with soil property preferably soil layer as bearing course at pile end.The major diameter expanded bore pile can make full use of pile side friction and end resistance, thereby has higher capacity, is widely used in various building foundations.The major diameter expanded bore pile mostly adopts the form of construction work of manually digging hole.In soft layer, during manually digging hole, often occur the situations such as hole, infiltration of collapsing in the construction easily, therefore need precast concrete casing in advance, imbed casing while excavate, and extract the underground water that infiltrates in the hole out with water pump at any time.The workman need stay in the hole for a long time during manually digging hole, is absolutely unsafe, and therefore bans use of in a lot of areas.Only owing to safety problem but not technical problem limits this superior extensive use of stake type in engineering, be one very big sorry.
The cast-in-situ concrete large-diameter tubular pile (is called for short the PCC stake; the patent No. 02112538.4 and 01273182.X); adopt mode of vibration with steel internal and external double-layer cavity structure under the flap valve shoe protection of closure; sink to the ground projected depth; evenly inject concrete by the concrete current divider to this structural cavities, this cavity structure is transferred in vibration then, and the flap valve shoe separates when this cavity structure is transferred to automatically; concrete wherein injects cavity structure to be transferred in the cannelure of back formation, forms the PCC stake.PCC stake external diameter is generally 1.0～1.5 meters, and wall thickness is 10～15 centimetres, 20～30 meters of the pile sinking degree of depth.The PCC stake obtains bigger bearing capacity with less concrete amount, is the superior stake type of a kind of economical rationality, cost performance therefore.This technology quick construction, cheap has been successfully applied in the large tracts of land treatment of soft foundation engineerings such as speedway, high-speed railway.The PCC stake belongs to semi-rigid semiflexible stake type on stricti jurise, generally use as clump of piles composite foundation.The PCC stake is a kind of large diameter thin wall pile tube, and sectional area itself is less, and the load that the pile body of single stake can bear is limited, can not as highrise building, bridge etc. independently pile foundation use, so its range of application is restricted.
Summary of the invention
The object of the present invention is to provide a kind of major diameter pedestal pile constructing process based on the PCC stake, overcome the defective of major diameter pedestal pile constructing process, make full use of PCC pile driving construction characteristics and the high advantage of major diameter expanded bore pile bearing capacity efficiently, develop a kind of major diameter pedestal pile constructing process based on the PCC stake.
The technical solution used in the present invention is:
A kind of major diameter pedestal pile constructing process based on the PCC stake may further comprise the steps:
1) PCC pile driving construction and maintenance;
2) adopt the water under high pressure punching method to take out the stake core soil of PCC stake;
3) adopt the water under high pressure punching method to take out the stake subsoil of PCC stake, until at the bottom of stake, forming the bottom outlet that the aperture enlarges;
4) transfer reinforcing cage, fluid concrete, form the major diameter expanded bore pile.
The inventive method can form the new stake type of PCC stake and major diameter expanded bore pile be combined into based on PCC stake technology.
Described PCC pile driving construction and maintenance, comparatively ripe in the prior art.As indicated above, the PCC pile driving construction can be undertaken by method of the prior art.General maintenance is more than 15 days, and the pile concrete of PCC stake reaches certain intensity.
The stake core soil of PCC stake adopts the water under high pressure punching method to take out, and promptly washes a core soil repeatedly with water under high pressure, makes it to form mud, with slush pump mud is extracted out.
The method that pore-forming can adopt water under high pressure to dash equally at the bottom of the PCC stake stake, after stake core soil is extracted out fully, use high pressure water washing PCC stake stake subsoil again, behind the formation mud stake subsoil is extracted out, until form the bottom outlet that the aperture is expanded greatly than PCC stake external diameter at the bottom of stake, bottom diameter is determined according to designing requirement.A dregs at the bottom of described bottom outlet can be repaired and remove.
Behind the fluid concrete, concrete fills up the bottom outlet and the PCC stake stake core of enlarged-diameter, forms integral body with the PCC stake of having poured into a mould.
Described PCC stake penetrates soft layer, and the head of expanded bore pile is positioned at the soil property that adheres to specification bearing course at pile end preferably.
Major diameter pedestal pile constructing process based on the PCC stake of the present invention combines the PCC stake and to form new stake type with the major diameter expanded bore pile, have bigger bearing capacity than common major diameter expanded bore pile, and the inventive method efficiency of construction height, safety are good.Advantage of the present invention and technique effect specifically are:
(1) PCC stake and major diameter expanded bore pile technology are all very ripe, both are combined form new stake type, do not have the difficulty on the construction technology;
(2) have soil compaction effect during the PCC pile driving construction, can make stake week soil compacted, increase pile side friction, therefore the major diameter expanded bore pile based on the PCC stake has bigger side friction than common major diameter expanded bore pile, therefore has bigger bearing capacity;
(3) in PCC stake stake core when excavation soil, adopt water under high pressure to dash, and extracts out with slush pump after making a core soil form mud again, avoided hand excavation's danger, and the efficiency of construction height;
(4) the PCC stake that construction earlier is good penetrates soft layer, plays support action after stake core soil takes out, and has effectively prevented the hole of collapsing.No longer need prefabricated casing, PCC pile driving construction speed is fast, has saved the time;
(5) PCC stake pile body diameter is big, can be directly when supporting capacity height, pore-forming are checked the workman be transferred to the hole by lifting rope at the bottom of, at the bottom of the hole, check the hole quality of enlarged footing part, the clear hole slagging-off of the stake end thoroughly, clean, easily guarantee the concrete pouring quality.
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in detail.Protection scope of the present invention is not exceeded with the specific embodiment, but is limited by claim.
Description of drawings
Fig. 1 PCC pilework schematic diagram;
Fig. 2 PCC stake stake core soil water under high pressure punching method schematic diagram that fetches earth;
The major diameter expanded bore pile that Fig. 3 the inventive method forms based on the PCC stake;
Fig. 4 major diameter expanded bore pile vertical view.
The specific embodiment
As Fig. 1～shown in Figure 4, a kind of major diameter pedestal pile constructing process based on the PCC stake, its major technique step is as follows:
(1) construction of PCC stake 1 and maintenance
The construction technology of PCC stake 1 is comparatively ripe; its key step comprises; adopt mode of vibration with steel internal and external double-layer cavity structure under the flap valve shoe protection of closure; sink to the ground projected depth; evenly inject concrete by the concrete current divider to this structural cavities, this cavity structure is transferred in vibration then, and the flap valve shoe separates when this cavity structure is transferred to automatically; concrete wherein injects cavity structure to be transferred in the cannelure of back formation, forms the PCC stake.Because support action is mainly played in PCC stake 1 in this type, so its quality control standard can suitably relax, to accelerate efficiency of construction, to reduce cost.
PCC stake general maintenance is more than 15 days, after the pile concrete for the treatment of PCC stake 1 reaches certain intensity, can excavate a core soil 3.
(2) take out stake core soil 3
Adopt water under high pressure to wash a core soil 3 repeatedly, make it to form mud 9, mud 9 is extracted out with slush pump 8.
(3) take out stake subsoil 4, and form the major diameter bottom outlet
After stake core soil 3 is extracted out fully, with high pressure water washing part stake subsoil 4, behind the formation mud stake subsoil 4 is extracted out again.Stake subsoil 4 is extracted not necessarily rule of back bottom shapes out, at this moment can adopt lifting rope that one workman is transferred at the bottom of, the stake subsoil is suitably repaired, make it to form the shape of enlarged footing part 5 shown in Figure 3, and remove a stake end dregs.
(4) transfer reinforcing cage, fluid concrete
Transfer the good reinforcing cage of prior colligation behind the pore-forming immediately.After reinforcing cage is transferred, fluid concrete at once, concrete pouring should be carried out behind pore-forming as early as possible, in case the bottom outlet of stake end enlarged footing part 5 is out of shape under soil pressure and seepage pressure effect.After concrete fills up enlarged footing part 5 and pile body part 6, form integral body with the PCC stake 1 of having poured into a mould, finish based on the major diameter expanded bore pile construction of PCC stake this moment.
Claims (6)
1, a kind of major diameter pedestal pile constructing process based on the PCC stake may further comprise the steps:
1) PCC pile driving construction and maintenance;
2) adopt the water under high pressure punching method to take out the stake core soil of PCC stake;
3) adopt the water under high pressure punching method to take out the stake subsoil of PCC stake, until at the bottom of stake, forming the bottom outlet that the aperture enlarges;
4) transfer reinforcing cage, fluid concrete, form the major diameter expanded bore pile.
2, major diameter pedestal pile constructing process according to claim 1 is characterized in that: described water under high pressure punching method is to adopt water under high pressure to wash a core soil or stake subsoil repeatedly, makes it to form mud, with slush pump mud is extracted out.
3, major diameter pedestal pile constructing process according to claim 1, it is characterized in that: the aperture of described bottom outlet is greater than the external diameter of PCC stake.
4, major diameter pedestal pile constructing process according to claim 1 is characterized in that: step 3) comprises repairs and removes dregs to described bottom outlet.
5, major diameter pedestal pile constructing process according to claim 1 is characterized in that: the concrete of step 4) cast fills up bottom outlet and PCC stake stake core, forms integral body with the PCC stake.
6, major diameter pedestal pile constructing process according to claim 1 is characterized in that: described PCC stake penetrates soft layer, and the head of expanded bore pile is positioned at bearing course at pile end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910183524A CN101666088A (en) | 2009-09-14 | 2009-09-14 | Construction method of large-diameter expanded bore pile based on PCC pile |
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|---|---|---|---|
| CN200910183524A CN101666088A (en) | 2009-09-14 | 2009-09-14 | Construction method of large-diameter expanded bore pile based on PCC pile |
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| CN101666088A true CN101666088A (en) | 2010-03-10 |
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| CN200910183524A Pending CN101666088A (en) | 2009-09-14 | 2009-09-14 | Construction method of large-diameter expanded bore pile based on PCC pile |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107859034A (en) * | 2017-11-14 | 2018-03-30 | 中铁十局集团第工程有限公司 | Large diameter pile foundation spillage immediate processing method |
| CN113957883A (en) * | 2021-11-11 | 2022-01-21 | 李汗 | Concrete prefabricated foundation pile and construction method thereof |
-
2009
- 2009-09-14 CN CN200910183524A patent/CN101666088A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107859034A (en) * | 2017-11-14 | 2018-03-30 | 中铁十局集团第工程有限公司 | Large diameter pile foundation spillage immediate processing method |
| CN113957883A (en) * | 2021-11-11 | 2022-01-21 | 李汗 | Concrete prefabricated foundation pile and construction method thereof |
| CN113957883B (en) * | 2021-11-11 | 2023-01-24 | 浙江荣森建设有限公司 | Concrete prefabricated foundation pile and construction method thereof |
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Open date: 20100310 |