CN105756038A - Construction method for composite foundations - Google Patents
Construction method for composite foundations Download PDFInfo
- Publication number
- CN105756038A CN105756038A CN201610342850.9A CN201610342850A CN105756038A CN 105756038 A CN105756038 A CN 105756038A CN 201610342850 A CN201610342850 A CN 201610342850A CN 105756038 A CN105756038 A CN 105756038A
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- China
- Prior art keywords
- minor
- diameter
- pile
- steel pipe
- construction method
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to a construction method for composite foundations.The construction method comprises the steps that firstly, steel pipe sets composed of a plurality of minor-diameter steel pipes aim at pile positions to be sunk into a soil body to a set depth; secondly, the steel pipe sets are elevated while fine concrete is pumped into the minor-diameter steel pipes; thirdly, operation in the second step continues to be conducted until the steel pipe sets are elevated out of the ground, and a set of minor-diameter piles is formed in the foundations; fourthly, operation from the first step to the third step is repeatedly conducted until the foundations of a whole needed field are full of the minor-diameter piles; fifthly, a mattress layer is laid on the tops of the minor-diameter piles, and the composite foundations are formed.According to the construction method, the pile soil displacement area is increased by reducing the pile diameter and increasing the number of the piles, and hole forming, hole extruding and pressing filling are finished at a time; multiple piles can be constructed at a time, the structure is simple, continuity is high, and work efficiency is high.
Description
Technical field
The present invention relates to field of civil engineering, particularly relate to the construction method of a kind of composite foundation.
Background technology
In the stiffening basic ground of building, composite foundation be through frequently with construction method.Composite foundation stabilization processes the soil strength referring in ground and deforms the requirement that can not meet upper load, the method to soil reinforcement is taked in order to play the bearing capacity of soil, namely adding stake shared upper load in the soil body, composite foundation construction method conventional at present includes the construction methods such as broken stone pile, CFG stake, cement earth pile.In composite foundation, determining that the key parameter of its bearing capacity size is stake soil area replacement ratio, namely the surface area of the pile body in composite foundation quantity more big, stake is more many, pile spacing is more little, and replacement rate is more high, and the bearing capacity of composite foundation is also more high.But, in order to improve the bearing capacity of ground and the quantity increasing stake simply or add the diameter of timber pile, the adverse effects such as quantities strengthens, construction cost increases, the duration is longer all can be caused undoubtedly.
Summary of the invention
For solving the problems referred to above, the construction method of a kind of composite foundation of the present application, the steps include:
1) the steel pipe align piles position being made up of several minor-diameter steel-tubes, by the mode of one or more combinations in vibration, hammering, static pressure, sinks to steel pipe in the soil body, until set depth；
2) while pumping fine concrete in steel pipe medium-small diameter steel pipe, it is lifted up steel pipe；
3) continuation steps 2) operation, until steel pipe is proposed earth's surface, ground forms one group of Small Diameter Pile；
4) repeat the above steps 1) to the operation of step 3), until the ground in whole required place is covered with Small Diameter Pile；
5) mattress layer, form compound foundation are laid on Small Diameter Pile top.
In above-mentioned construction method, the above-mentioned steel pipe being made up of several minor-diameter steel-tubes, the quantity of this minor-diameter steel-tube is 2～9, diameter is 50～300mm, the bottom of minor-diameter steel-tube adopts flapper pile tip or precast pile tip closure, top is connected by feeding chamber and is fixed as one, and the inner chamber of feeding chamber and the inner space of minor-diameter steel-tube, feeding chamber is connected with high-pressure pump by conveying pipeline.
In above-mentioned construction method, above-mentioned fine concrete, is that one or several mix and stir and form by cement and water and sand, soil, flyash, fine grained rubble, concrete admixture.
In above-mentioned construction method, being covered with Small Diameter Pile in above-mentioned ground, whole pile spacings between Small Diameter Pile is equal.
Feature and the advantage of the construction method of the composite foundation of the application are in that: 1. the quantity of the diameter and increase stake by reducing stake improves stake soil replacement rate, when the amount of concrete identical with common CFG stake employing, its lateral area increases by 100～150%, and foundation bearing capacity improves 80～150%.Although it is higher that the quantity increase of 2. stake, the many Small Diameter Pile but employing steel pipe mode once can be constructed, and the pore-forming of Small Diameter Pile compare the work efficiency such as larger-diameter CFG stake with filling process.3. whole work progress does not all fetch earth, and adopts soil compaction method by compacted for the former stake holes place soil body, namely avoids the operation of clear soil outward transport, significantly improves again side friction and the inter-pile soil bearing capacity of pile body.4. disposable completing pore-forming, squeezed and guncreting multiple working procedure, simple in construction, seriality are strong, work efficiency is higher.
Accompanying drawing explanation
Fig. 1 is the process chart of an embodiment of the composite foundation construction method of the present invention；
Fig. 2 is transverse direction and the vertical cross section schematic diagram of multiple combination examples of the steel pipe adopted in the present invention；
Fig. 3 is the schematic diagram of the composite foundation after adopting the construction method of the present invention to process.
Detailed description of the invention
Fig. 1 is the process chart of an embodiment of the composite foundation construction method of the present invention, first, in Fig. 1 shown in a, the steel pipe 1 align piles position being made up of four minor-diameter steel-tubes, sink in the soil body, in steel pipe 1, the bottom of every minor-diameter steel-tube is flapper pile tip, and the top of steel pipe 1 is provided with feeding chamber 2 and connects with every minor-diameter steel-tube, and feeding chamber 2 connects with outside high-pressure pump；Then, in Fig. 1 shown in b, will be sunk in the soil body to by steel pipe 1 by the mode of static pressure, until set depth；Then, in Fig. 1 shown in c, pumping fine concrete 3 in feeding chamber 2, fine concrete 3 is poured into bottom stake holes by minor-diameter steel-tube inner chamber pressing bottom minor-diameter steel-tube, while being lifted up steel pipe 1；Then, in Fig. 1 shown in d, be performed continuously over step 2) pump concrete and lift up operation, until steel pipe 1 is proposed earth's surface, in ground formed four Small Diameter Pile 4；Then, in Fig. 1 shown in e, repeat the above steps 1) to the operation of step 3), until the ground in whole required place is covered with Small Diameter Pile；Finally, in Fig. 1 shown in f, lay mattress layer 5, form compound foundation on Small Diameter Pile top.
Fig. 2 is transverse direction and the vertical cross section schematic diagram of multiple combination examples of the steel pipe adopted in the present invention, as in figure 2 it is shown, 2-1 is three minor-diameter steel-tubes, 2-2 is four minor-diameter steel-tubes, 2-3 is five minor-diameter steel-tubes, and 2-4 is six roots of sensation minor-diameter steel-tube, and 2-5 is nine minor-diameter steel-tubes.
Fig. 3 is the schematic diagram of the composite foundation after adopting the construction method of the present invention to process, as it is shown on figure 3, be covered with Small Diameter Pile 4 in ground, whole pile spacings between Small Diameter Pile 4 is equal, and mattress layer 5 is all laid on the stake top of Small Diameter Pile 4.
Claims (4)
1. a construction method for composite foundation, the method comprises the steps:
1) the steel pipe align piles position being made up of several minor-diameter steel-tubes, by the mode of one or more combinations in vibration, hammering, static pressure, sinks to steel pipe in the soil body, until set depth；
2) while pumping fine concrete in the minor-diameter steel-tube in steel pipe, it is lifted up steel pipe；
3) continuation steps 2) operation, until steel pipe is proposed earth's surface, ground forms one group of Small Diameter Pile；
4) repeat the above steps 1) to the operation of step 3), until the ground in whole required place is covered with Small Diameter Pile；
5) mattress layer, form compound foundation are laid on Small Diameter Pile top.
2. construction method as claimed in claim 1, it is characterized in that, the steel pipe being made up of several minor-diameter steel-tubes described in step 1), the quantity of this minor-diameter steel-tube is 2～9, diameter is 50～300mm, and the bottom of minor-diameter steel-tube adopts flapper pile tip or precast pile tip closure, and top is fixed as one by feeding chamber connection, the inner chamber of feeding chamber and the inner space of minor-diameter steel-tube, feeding chamber is connected with high-pressure pump by conveying pipeline.
3. construction method according to claim 1, it is characterised in that step 2) described in fine concrete, be that one or several mix and stir and form by cement and water and sand, soil, flyash, fine grained rubble, concrete admixture.
4. construction method according to claim 1, it is characterised in that being covered with Small Diameter Pile in the ground described in step 4), whole pile spacings between Small Diameter Pile is equal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610342850.9A CN105756038A (en) | 2016-05-23 | 2016-05-23 | Construction method for composite foundations |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610342850.9A CN105756038A (en) | 2016-05-23 | 2016-05-23 | Construction method for composite foundations |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105756038A true CN105756038A (en) | 2016-07-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610342850.9A Pending CN105756038A (en) | 2016-05-23 | 2016-05-23 | Construction method for composite foundations |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105756038A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0543320A1 (en) * | 1991-11-22 | 1993-05-26 | Vibroflotation Ag | Device for producing concrete piles in the ground |
| EP0474070B1 (en) * | 1990-08-31 | 1994-11-30 | Vibroflotation Ag | Method and device for the insertion of a narrow partition or subterraneous curtain in the earth |
| PL182270B1 (en) * | 1996-12-31 | 2001-12-31 | Politechnika Swietokrzyska | Method of in situ making a micropile directly in the ground |
| CN102182176A (en) * | 2010-12-20 | 2011-09-14 | 陈健雄 | Cast-in-place concrete tube-sheet pile, piling device and piling construction method thereof |
| CN102943466A (en) * | 2012-11-14 | 2013-02-27 | 中铁十二局集团有限公司 | Construction method for miniature steel pipe concrete pile to penetrate through roadbed layer for reinforcing soft foundation construction |
| CN104480956A (en) * | 2014-10-31 | 2015-04-01 | 上海市政工程设计研究总院（集团）有限公司 | Small-diameter mold-bagged concrete pile composite foundation |
-
2016
- 2016-05-23 CN CN201610342850.9A patent/CN105756038A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0474070B1 (en) * | 1990-08-31 | 1994-11-30 | Vibroflotation Ag | Method and device for the insertion of a narrow partition or subterraneous curtain in the earth |
| EP0543320A1 (en) * | 1991-11-22 | 1993-05-26 | Vibroflotation Ag | Device for producing concrete piles in the ground |
| PL182270B1 (en) * | 1996-12-31 | 2001-12-31 | Politechnika Swietokrzyska | Method of in situ making a micropile directly in the ground |
| CN102182176A (en) * | 2010-12-20 | 2011-09-14 | 陈健雄 | Cast-in-place concrete tube-sheet pile, piling device and piling construction method thereof |
| CN102943466A (en) * | 2012-11-14 | 2013-02-27 | 中铁十二局集团有限公司 | Construction method for miniature steel pipe concrete pile to penetrate through roadbed layer for reinforcing soft foundation construction |
| CN104480956A (en) * | 2014-10-31 | 2015-04-01 | 上海市政工程设计研究总院（集团）有限公司 | Small-diameter mold-bagged concrete pile composite foundation |
Non-Patent Citations (1)
| Title |
|---|
| 曹宏军: "微型沉管灌注素砼桩复合地基设计及其优化的探讨", 《科技资讯》 * |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160713 |
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| WD01 | Invention patent application deemed withdrawn after publication |