CN1699702A - Construction process of composite pile foundation of foundation and pile end displacement adjusting device thereof - Google Patents
Construction process of composite pile foundation of foundation and pile end displacement adjusting device thereof Download PDFInfo
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- CN1699702A CN1699702A CN200510040317.9A CN200510040317A CN1699702A CN 1699702 A CN1699702 A CN 1699702A CN 200510040317 A CN200510040317 A CN 200510040317A CN 1699702 A CN1699702 A CN 1699702A
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000002131 composite material Substances 0.000 title claims abstract description 16
- 238000010276 construction Methods 0.000 title claims abstract description 14
- 239000010438 granite Substances 0.000 claims abstract description 24
- 239000002689 soil Substances 0.000 claims abstract description 24
- 238000013461 design Methods 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 19
- 239000010959 steel Substances 0.000 claims description 19
- 230000001105 regulatory effect Effects 0.000 claims description 17
- 238000005516 engineering process Methods 0.000 claims description 4
- 230000001174 ascending effect Effects 0.000 claims description 2
- 238000004062 sedimentation Methods 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 2
- 241001310793 Podium Species 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012946 outsourcing Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
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Abstract
The invention discloses a construction process of a foundation composite pile foundation suitable for uneven granite residual soil, which comprises the following steps: determining the load to be borne by the pile according to the design value of the upper structure load; pile arrangement is carried out according to the principle of pile arrangement under walls and columns; arranging an end bearing friction pile on a granite residual soil layer, arranging an end bearing pile on the boulder, and arranging a displacement adjusting device for adjusting sedimentation difference on the end bearing pile, wherein the adjusting device consists of a cylinder body, a top plate and a telescopic element, the top plate and the telescopic element are arranged in the cylinder body, and the telescopic element is positioned in a cavity defined by the cylinder body and the top plate; compared with a natural foundation method, the method solves the problem that a high-rise building is difficult to build by uneven granite residual soil foundation, and can ensure that the building has small settlement and is safe and reliable; compared with a composite foundation method, the bearing capacity of the granite residual soil is fully utilized, a small number of piles are used, the problem that a high-rise building is difficult to construct by using uneven granite residual soil foundations is successfully solved, and the cost is reduced.
Description
Technical field
The present invention relates to a kind of foundation construction technology and implement device thereof, especially a kind of construction process for composite pile of foundation and pile tip displacement regulating device thereof.
Background technology
Inhomogeneous granite residual soil is the more common geological conditions of Xiamen area, and it is incomplete that this geological conditions is usually expressed as the granite weathering, forms random distribution, boulder not of uniform size in foundation soil.The lithology of boulder mostly is gentle breeze granite, in also having, strong weathered granite.Part boulder lithology is a gentle breeze granite core, in the outsourcing, severely-weathered shell.For conventional pile foundation, will be in formation of pile through the clear rock of explosion to pass boulder, constructional difficulties not only, but also cause the soil body to destroy easily, so can't realize.
The base case commonly used at present for this kind foundation soil is:
(1) uses natural ground.Because granite residual soil is not having under the disturbance situation, actual strength has certain potentiality, and it is possible using natural ground, but it is bigger to do building settlement like this, certain risk is arranged, and will limit the height of building.
(2) use composite foundation.The difficult control of composite foundation construction quality, generally be applied to multistory building more, therefore, easily granite residual soil caused disturbance because composite foundation is constructed in addition as using this method also need limit the height of building, certain risk is arranged, and the cost of composite foundation is also higher.
In sum: aspect inhomogeneous granite residual soil ground, base case commonly used not only need limit the height of building, and construction risk is bigger, and cost is higher.
Summary of the invention
The invention provides a kind of construction process for composite pile of foundation and pile tip displacement regulating device thereof that can reduce even eliminate the relative settlement influence, be particularly suited for as the high rise building foundation that is built on the inhomogeneous granite residual soil ground, have the advantage of economy, safety.
The present invention adopts following technical scheme:
A kind of construction process for composite pile of foundation that is suitable for inhomogeneous granite residual soil use:
(1) determines the load that stake be should bear according to the superstructure design load;
(2) lay out pile according to the principle that lays out pile under wall, the post;
(3) at the granite residual soil layer end is set and holds friction pile, end bearing pile is being set on the boulder and on end bearing pile, is being provided for regulating the displacement adjustment device of settlement difference.
The present invention is used to implement the displacement adjustment device of above-mentioned technology, is made up of cylinder body, top board and telescopic element, and top board and telescopic element are located in the cylinder body, and telescopic element is positioned at the cavity that is surrounded by cylinder body and top board.
Compared with prior art, the present invention has following advantage:
The present invention compares with the natural ground method, has not only solved the difficult difficult problem of building high-rise building of inhomogeneous granite residual soil ground, and can make the sedimentation of building less, safe and reliable; Compare than the composite foundation method, the present invention has made full use of the bearing capacity that granite residual soil had, and uses less stake number, when successfully solving the difficult construction high-rise building of an inhomogeneous granite residual soil ground difficult problem, has reduced cost.The present invention can use short artificial shoveling castinplace pile in addition, and quality control is convenient, easy, more can guarantee the safety of building compared with composite foundation.
Description of drawings
Fig. 1 is the structural representation of device first embodiment of the present invention.
Fig. 2 is the structural representation of device second embodiment of the present invention.
Fig. 3 is the structural representation of device the 3rd embodiment of the present invention.
Fig. 4 is the structural representation of device the 4th embodiment of the present invention.
Among the figure: 1. raft plate; 2. grade beam; 3. stake;
The specific embodiment
A kind of construction process for composite pile of foundation that is suitable for inhomogeneous granite residual soil use:
(1) determines the load that stake be should bear according to the superstructure design load;
(2) lay out pile according to the principle that lays out pile under wall, the post;
(3) at the granite residual soil layer end is set and holds friction pile, end bearing pile is being set on the boulder and on end bearing pile, is being provided for regulating the displacement adjustment device of settlement difference, in the present embodiment, end bearing pile is arranged on 1/4 the boulder of boulder edge greater than stake hole sectional area.
Below be an example using the method for the invention, i.e. the dwelling house of 30 layers of buildings, its underpart is linked to be an integral body by one deck basement and three layers of podium with engineering:
(1) the above total load of base plate (design load) is as calculated: N=608667.4 (kN) (single building);
Wherein: main building load: N1=5576844.6 (kN); Annex load: N2=31822.8 (kN);
(2) determine the characteristic load bearing capacity of ground
According to pressurementer test and load plate test result, comprehensively estimate the bearing capacity correction value f of foundation soil
a=420kPa.
(3) determine that pile foundation should bear design load
Adopt Φ 900 hand excavated piles, lining thickness 150, actual stake footpath 1200mm, the long 10m of stake.
Bearing capacity of single pile limiting value P
u=3820kN; Bearing capacity of single pile design load P
a=1910kN.
Pile foundation be should bear load: 69685kN.Stake number: n=37 root.
(4) only under main building, lay out pile according to the principle that lays out pile under wall (shear wall), the post.
(5) hand excavated pile is met 1/4 o'clock less than stake hole sectional area in little boulder or boulder edge, should cross the boulder construction.When running into big boulder, the thick artificial hardcore bed of 10～15cm is done at the stake end.When the boulder edge surpass stake hole sectional area 1/4 the time, on boulder, implant the reinforcing bar of 5 φ 16.
(6) setting of stake top displacement adjustment device
The building total settlement is estimated as 3～5cm, and getting the relative settlement value is 3cm.Hand excavated pile is about 3800kN for the ultimate bearing capacity of single pile that end holds friction pile, meets the ultimate bearing capacity of single pile of big boulder when transferring end bearing pile to much larger than 3800kN.So the rigidity with stake top spring after taking all factors into consideration is decided to be 160kN/mm; Consider the influence of other factors simultaneously, the total deformation of spring is decided to be 6cm.
Through monitoring, under the situation that building load puts in place substantially, the present maximum settlement of building is 38.1mm, and average settlement is 27mm.This and final settlement estimated value 3～5cm are very identical, illustrate that enforcement of the present utility model is also is successful reasonably.Pass through economic analysis in addition, the solution that application of the present invention is not only successful how in a difficult problem of on inhomogeneous granite residual soil ground, building highrise building, and economize on the use of funds than general base case and to reach 1,215 ten thousand yuan.
A kind of pile tip displacement regulating device that is used to regulate pile end displacement, by cylinder body 4, top board 5 and telescopic element are formed, top board 5 and telescopic element are located in the cylinder body 4, telescopic element is positioned at the cavity that is surrounded by cylinder body 4 and top board 5, wherein, telescopic element can adopt and stand on displacement adjusting steel plate between cylinder body 4 inner faces and the top board 5, this displacement is regulated steel plate and is tubular, and can form by the steel plate that is tubular 6 that diameter does not wait, tubular steel plate 6 is set-located in proper order by ascending diameter, the tubular steel plate is selected common HPB235 steel for use, and the difference in height of steel plate and spacing should be respectively 1cm and 2cm, and the number of turns is preferably about 6 circles.The height of inner ring steel plate and the thickness of steel plate can be regulated (big highly more, the displacement that can regulate is big more, and steel plate is thick more, and the rigidity of whole device is also big more) according to concrete needs.Concrete control method is: at first calculate required adjusting displacement and stake support stiffness, according to the relation of " rigidity=bearing capacity/displacement ", calculate required bearing capacity again, determine the thickness of steel plate again.The thickness of normal conditions lower steel plate is got 3～5mm.
Above-mentioned telescopic element can also adopt other following concrete mode:
1. telescopic element adopts dish spring 10, is provided with center steel column 9 at the center of dish spring 10, and the dish spring can directly be selected for use in dish spring specification table according to pile bearing rigidity and the displacement regulated quantity calculated.
2. telescopic element adopts rubber pad 8, and can adopt the rubber pad that is superimposed with each other 8 of (as: 3,5 or 7 rubber pads) more than 2, between adjacent rubber pad, be provided with steel plate 7, rubber pad can adopt JGD-D type isolation rubber pad (as adopting the rubber pad of other specification, must satisfy " seismic design provision in building code " respective specified in (GB50011-2001)).Its rigidity and thickness can be with requiring adjustment.Be specially: according to the pile bearing rigidity of calculating gained, select the rubber pad of respective model for use,, calculate the height of rubber pad then according to support stiffness and required adjusting displacement.
3. telescopic element is made up of the concrete ball 11 that is full of in being enclosed in the cavity by cylinder body 4 and top board 5, its diameter, concrete strength can be adjusted as required, are specially: deduct the concrete sphere volume is the total displacement amount of adjusting again divided by the chamber interface area relation according to cavity volume.At first, calculate the volume of required concrete ball, and then calculate concrete ball size according to calculating required displacement regulated quantity.Concrete intensity then mainly obtains according to pile bearing rigidity and the displacement regulated quantity of calculating gained jointly.
Claims (8)
1, a kind of construction process for composite pile of foundation that is suitable for inhomogeneous granite residual soil use is characterized in that:
(1) determines the load that stake be should bear according to the superstructure design load;
(2) lay out pile according to the principle that lays out pile under wall, the post;
(3) at the granite residual soil layer end is set and holds friction pile, end bearing pile is being set on the boulder and on end bearing pile, is being provided for regulating the displacement adjustment device of settlement difference.
2, construction process for composite pile of foundation according to claim 1 is characterized in that end bearing pile is arranged on 1/4 the boulder of boulder edge greater than stake hole sectional area.
3, a kind of displacement adjustment device that is used to implement the described technology of claim 1, it is characterized in that forming by cylinder body (4), top board (5) and telescopic element, top board (5) and telescopic element are located in the cylinder body (4), and telescopic element is positioned at the cavity that is surrounded by cylinder body (4) and top board (5).
4, pile tip displacement regulating device according to claim 3 is characterized in that telescopic element adopts to stand between cylinder body (4) inner face and the top board (5) displacement and regulate steel plate.
5, pile tip displacement regulating device according to claim 4 is characterized in that displacement adjusting steel plate is tubular.
6, pile tip displacement regulating device according to claim 5 is characterized in that telescopic element is made up of the steel plate that is tubular (6) that diameter does not wait, and tubular steel plate (6) is set-located in proper order by ascending diameter.
7, pile tip displacement regulating device according to claim 3 is characterized in that telescopic element adopts rubber pad (8).
8, pile tip displacement regulating device according to claim 7 is characterized in that adopting the rubber pad that is superimposed with each other (8) more than 2, is provided with steel plate (7) between adjacent rubber pad.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100403179A CN100371536C (en) | 2005-05-30 | 2005-05-30 | Construction process of composite pile foundation of foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100403179A CN100371536C (en) | 2005-05-30 | 2005-05-30 | Construction process of composite pile foundation of foundation |
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| Publication Number | Publication Date |
|---|---|
| CN1699702A true CN1699702A (en) | 2005-11-23 |
| CN100371536C CN100371536C (en) | 2008-02-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100403179A Expired - Fee Related CN100371536C (en) | 2005-05-30 | 2005-05-30 | Construction process of composite pile foundation of foundation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110158667A (en) * | 2019-03-08 | 2019-08-23 | 北京市劳动保护科学研究所 | A kind of anti-floating vibration insulation structure and building |
| CN112031011A (en) * | 2020-08-26 | 2020-12-04 | 宜昌恒生建筑安装有限公司 | Construction process of concrete pile foundation |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242001B (en) * | 2014-08-22 | 2017-12-01 | 李大才 | A kind of electric power line and process equipment and processing technology |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1422772A (en) * | 1971-10-12 | 1976-01-28 | Cementation Co Ltd | Method of supporting a permanent aboveground structure |
| JP3455861B2 (en) * | 1995-03-03 | 2003-10-14 | 清水建設株式会社 | Foundation structure and foundation construction method |
| CN1202557A (en) * | 1998-06-05 | 1998-12-23 | 梁仁旺 | Composite pile constructed in drilled hole |
| JP3725507B2 (en) * | 2002-09-17 | 2005-12-14 | 多摩エンジニアリング株式会社 | Pillar head height adjuster for foundation support pile for buildings |
| CN1490467A (en) * | 2003-08-05 | 2004-04-21 | 胡柏英 | Composite friction pile structure and constructing method thereof |
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2005
- 2005-05-30 CN CNB2005100403179A patent/CN100371536C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110158667A (en) * | 2019-03-08 | 2019-08-23 | 北京市劳动保护科学研究所 | A kind of anti-floating vibration insulation structure and building |
| CN112031011A (en) * | 2020-08-26 | 2020-12-04 | 宜昌恒生建筑安装有限公司 | Construction process of concrete pile foundation |
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| Publication number | Publication date |
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| CN100371536C (en) | 2008-02-27 |
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Granted publication date: 20080227 Termination date: 20120530 |