CN201339186Y - Soft rock concrete replacement pile composite foundation - Google Patents
Soft rock concrete replacement pile composite foundation Download PDFInfo
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- CN201339186Y CN201339186Y CNU2008202229903U CN200820222990U CN201339186Y CN 201339186 Y CN201339186 Y CN 201339186Y CN U2008202229903 U CNU2008202229903 U CN U2008202229903U CN 200820222990 U CN200820222990 U CN 200820222990U CN 201339186 Y CN201339186 Y CN 201339186Y
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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- Y02A10/23—Dune restoration or creation; Cliff stabilisation
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Abstract
本实用新型公开了一种软岩混凝土置换桩复合地基，目的是解决现有复合地基不能满足设置在强风化软质岩层中、层数在30～45层、地下室为3～5层、持力层承载力要求在800kPa～1000kPa的建筑承载力要求的问题，该复合地基为在地基的面积范围内，正方形布置有混凝土置换桩，混凝土置换桩包括侧壁设置有护壁的圆形桩孔和圆形桩孔内填充的素混凝土桩体；置换桩进入地基的持力层，持力层由强风化岩层或中风化岩层构成；所述置换桩在地基的强风化岩层的承载力特征值不能满足设计要求时，将中风化岩作为持力层，置换桩进入持力层大于或等于0.5m。本实用新型可广泛用于软质岩层地基的加固。
The utility model discloses a soft rock concrete displacement pile composite foundation, aiming to solve the problem that the existing composite foundation cannot be installed in a strong weathered soft rock layer, the number of layers is 30 to 45 layers, the basement is 3 to 5 layers, and the bearing capacity is low. The bearing capacity of the building requires 800kPa to 1000kPa. The composite foundation is within the area of the foundation, and the square is arranged with concrete replacement piles. The concrete replacement piles include circular pile holes and circular The plain concrete pile body filled in the shaped pile hole; the replacement pile enters the bearing layer of the foundation, and the bearing layer is composed of a strongly weathered rock layer or a moderately weathered rock layer; the characteristic value of the bearing capacity of the replacement pile in the strongly weathered rock layer of the foundation cannot satisfy When the design requires, the medium weathered rock is used as the bearing layer, and the displacement pile enters the bearing layer greater than or equal to 0.5m. The utility model can be widely used in the reinforcement of soft rock formation foundations.
Description
Technical field
The utility model belongs to the realm of building construction, particularly a kind of composite foundation that strengthens characteristic load bearing capacity at soft rock stratum.
Background technology
Composite foundation is meant that natural ground part soil body in the ground processing procedure is enhanced, or replaced, or reinforcement material is set in natural ground, stabilization zone is by matrix (the natural ground soil body or the modified natural ground soil body) and strengthens body artificial foundation dimerous; Under load action, matrix and enhancing body are born the effect of load jointly; Composite foundation, promptly be meant by strengthen body and on every side foundation soil bear the ground of load jointly.The job practicess of the form of composite foundation, the material of forming composite foundation enhancing body, composite foundation enhancing body etc. exert an influence to the effectiveness of composite foundation.
Along with the development of foundation treatment technology and the development of theory of composite foundation, all kinds of flexible pile composite foundations, rigid pile composite foundation, and level is applied to strengthening the bluk recombination ground.As: cement-soil composite foundation, low-intensity pile composite foundation, stake net composite foundation, steel concrete pile composite foundation, reinforced earth ground etc.Because composite foundation can utilize natural ground preferably and strengthen the potential that body is born load, has favorable economic benefit.
At present, composite foundation technology is in China's building construction (comprising highrise building) engineering, high-grade highway and railway engineering, be used widely in the civil engineering constructions such as municipal engineering and stockyard, airport, dykes and dams, the composite foundation of having used mainly contains following a few class:
1. replacement stone pile composite foundation
Replacement stone pile composite foundation belongs to the discrete material pile composite foundation, and its bearing capacity depends on the undrained shear strength of natural ground soil to a great extent.The replacement stone pile composite foundation technology is usually used in reinforcing sandy soil ground and unsaturated soil ground, and close by shaking, compacted inter-pile soil make replacement stone pile composite foundation and inter-pile soil that bigger bearing capacity all be arranged, thereby the bearing capacity of foundation soil increase rate is big, and settlement after construction is little.
2. soil-cement pile composite foundation technology
According to the job practices difference, can be divided into compound foundation with deep mixing pile, rotary churning pile composite foundation and composite foundation with rammed soil-cement pile etc. again.
Deep mixing method divides whitewashing and two kinds of the deep mixing methods of dusting, and it is solidfied material that deep mixing method adopts cement usually, and it is solidfied material that the lime of employing is also arranged.Deep mixing method is applicable to grounds such as handling mud, mucky soil, loess, silt and glutinous part soil.
Jet grouting pile construction technology can be divided into single pipe method, double pipe method and triple pipe method again.Jet grounting is applicable to grounds such as mud, mucky soil, loess, silt, cohesive soil, sand, artificial earth fill and gravelly soil.Rammed concrete pile is applicable to the reinforcing of the above ground of groundwater table usually, adopts manually digging hole, the mixture of back-filling in layers cement and soil, and compaction in layers forms rammed concrete pile.
3. low-intensity pile composite foundation technology
The composite foundation technology that belongs to the low-intensity pile composite foundation is a lot, as CFG (CFG stake) composite foundation technology, and low-intensity sand-stone concrete pile composite foundation technology, and two ashes (lime, flyash) concrete pile composite foundation technology.The concreting pile constructing process is adopted in the low-intensity stake, and construction equipment is general, easy construction.Adopt the low-intensity pile composite foundation to reinforce, reinforcement depth is dark, can give full play to the carrying potential between stake and stake soil, and applicability is good, and is good in economic efficiency.
4. steel concrete pile composite foundation technology
In a broad sense, the steel bar concrete pile of consideration pile soil common action all can belong to the steel concrete pile composite foundation.Thin pile foundation, minimizing settling amount pile foundation, composite pile foundation all can belong to the steel concrete pile composite foundation technology.
5. dust pile compositing foundation technology
Lime soil pile is meant lime and native mix, and the lime soil pile that forms is tamped in layering in the hole.The lime soil pile construction mainly is divided into two parts, the one, pore-forming, the 2nd, backfilling compaction.The rammed concrete composite foundation also can belong to dust pile compositing foundation.
6. lime pile composite foundation technology
Lime pile is meant and pours into quicklime then by method pore-formings such as adopting immersed tube hole forming method or luoyang spade hole forming method that compacting quicklime is also used the stake of stickiness grave, the stake that is provided with in ground.Adopt the lime pile composite foundation stabilization, the foundation soil body water content is too high all can to influence strengthening quality with crossing to hang down, and reinforcement depth is more shallow.
7. compaction pile composite foundation in the hole
Adopt immersed tunnelling method, the auger method pore-formings such as method that fetch earth, back-filling in layers rubble or dirt or slag or dregs, and adopt hammer ram with the backfill compaction in layers, and compacted, the close inter-pile soil that shakes reach the purpose of consolidated subsoil.
8. long-short-pile composite foundation technology
In the pile body composite foundation, the shallow-layer replacement ratio can be higher, and the deep layer displacement rate can be hanged down, and can more imitate the potential of performance material of body of a pile aspect raising bearing capacity and minimizing settling amount like this, so developed long-short-pile composite foundation.
9. stake net composite foundation
The mainly employing in railway or highway subgrade reinforcing of present stage of stake net composite foundation, the rigidity composite foundation adds the geo-grid reinforcement cushion and has just formed a stake net composite foundation, and load is born jointly by stake and soil.
10. reinforced earth composite foundation technology
Usually adopt geotextiles, geo-grid to form the reinforced earth composite foundation as the muscle material.The reinforced earth composite foundation is mainly used in road ground and reinforces.
But along with the continuous appearance of high-rise and super highrise building, the Design of Bearing Capacity that existing Bearing Capacity of Composite Foundation can not satisfy following condition requires:
(1), the architectural design number of plies is 30～45 layers;
(2), basement is 3～5 layers;
(3), the substrate absolute altitude is arranged in the severely-weathered soft rock stratum;
(4), to the bearing stratum requirement for bearing capacity at 800kPa～1000kPa.
The utility model content
The purpose of this utility model be solve existing composite foundation can not satisfy be arranged in the severely-weathered soft rock stratum, the number of plies is 3～5 layers, the bearing stratum requirement for bearing capacity problem in the building requirement for bearing capacity of 800kPa～1000kPa at 30～45 layers, basement, provide a kind of composite foundation, to satisfy the requirement for bearing capacity under the above-mentioned condition.
The purpose of this utility model realizes by following technical proposals:
Soft rock concrete displacement pile composite foundation, in the areal extent of ground, by arranged in squares the displacement stake is arranged, described displacement stake comprises circular stake hole and inner pile body thereof, pile body is made of the plain concrete of inserting in the circular stake hole, the displacement stake enters the bearing stratum of ground, and bearing stratum is made of severely-weathered rock stratum or middle weathered rock formation.
When the characteristic load bearing capacity of described displacement stake in the severely-weathered rock stratum of ground can not meet design requirement, as bearing stratum, the displacement stake entered bearing stratum more than or equal to 0.5m with middle decomposed rock.
Described stake hole is provided with concrete cushion.
The external diameter of described displacement stake is 800～1200mm.
Described pile body plain concrete strength is determined according to the designing requirement of bearing capacity of foundation soil.
Described concrete cushion is the C10 concrete cushion, and thickness is 30cm.
Be provided with the concrete guard wall identical in the circular stake hole of described displacement stake with strength of the mixing pile.
The soft rock stratum that described circular stake hole is removed in the ground by manually digging hole constitutes.
The utility model adopts the composite foundation of said structure, reinforce severely-weathered soft rock stratum ground with concrete displacement pile composite foundation treatment technology, compare existing composite foundation treatment technology, the bearing capacity of this composite foundation obviously improves, ground composite deformation modulus after the reinforcing obviously increases, and can satisfy the requirement of super highrise building to bearing capacity of foundation soil fully.Simultaneously, this composite foundation is different from pile foundation again, without arrangement of reinforcement, does not have reinforcing cage to make and installation procedure in the stake, and time and expense have been saved in easy construction more, have the duration weak point, pollute little characteristics.
As seen, the utility model carries hypodynamic problem when having solved severely-weathered soft rock stratum as natural ground and other composite foundation processing of employing, can be widely used in the reinforcing of soft rock stratum ground.
Description of drawings
Fig. 1 is the layout schematic diagram of displacement stake in the utility model;
Fig. 2 is displacement stake and the basic schematic diagram that concerns in the utility model;
Fig. 3 is the schematic diagram of retaining wall in the utility model;
Number in the figure: the 1st, displacement stake, the 2nd, retaining wall, the 3rd, pile body, the 4th, concrete cushion.
The specific embodiment
Below in conjunction with specific embodiments and the drawings the utility model is further described.
Building requirements for following condition:
(1), the architectural design number of plies is 30～45 layers;
(2), basement is 3～5 layers;
(3), the substrate absolute altitude is arranged in the severely-weathered soft rock stratum;
(4), to the bearing stratum requirement for bearing capacity at 800kPa～1000kPa.
Can adopt the described soft rock concrete displacement of present embodiment pile composite foundation to make its bearing capacity reach requirement.
As shown in Figure 1, soft rock concrete displacement pile composite foundation be in the areal extent of ground, and arranged in squares has displacement stake 1, and displacement stake 1 comprises that sidewall is provided with the pile body 3 of filling in the circular stake hole of retaining wall 2 and the circular stake hole as shown in Figure 2.The soft rock stratum that circular stake hole is removed in the ground by manually digging hole constitutes.
As shown in Figure 3, retaining wall 2 is made of multistage retaining wall joint; The external diameter of every section retaining wall joint equates, internal diameter is up-small and down-big; Except that retaining wall joint topmost, the upper port inboard of other every section retaining wall joint is provided with boss; The lateral surface of every section retaining wall joint equates with the wall thickness of retaining wall joint lower port to the distance of the lateral surface of above-mentioned boss.
As shown in Figure 2, the stake hole is provided with concrete cushion.
Retaining wall and pile body all are that concrete is made, and both strength grade of concrete are identical.
The external diameter of displacement stake is 800～1200mm.
The pile body plain concrete strength is determined according to the designing requirement of bearing capacity of foundation soil.
The bearing capacity of single pile characteristic value of displacement stake meets following formula:
R
k(U
P∑q
sih
i+q
pA
p)/K
U in the formula
PThe girth (m) of-displacement stake
q
SiThe pile side friction characteristic value that-Di i layer soil is relevant with soil nature and construction technology
q
PThe end resistance characteristic value of-displacement stake end is by " technical code for building pile foundation " relevant regulations value (JGJ94-2008)
h
i-Di i the thickness of the layer
K-safety factor, value are 1.5～1.75
According to " building lot treatment technology standard " (JGJ79-2002), the replacement ratio of described displacement stake is determined by following formula:
F in the formula
Spk---nominal value of bearing capacity of composite foundation, unit are kPa;
A
P---the sectional area of stake, unit is m
2
β---inter-pile soil intensity performance degree, value is between 0.75～0.9;
R
k---the bearing capacity of single pile characteristic value, unit is kN;
α---the intensity of expression inter-pile soil improves coefficient, can rule of thumb estimate or survey given, and general cohesive soil is got α=1.0; The higher soil of sensitivity and structural local products are given birth to the construction technology of disturbance and construction speed when very fast, and α is the numerical value less than,
f
Sk---reinforce the characteristic load bearing capacity of back inter-pile soil, unit is kPa;
M---area replacement ratio, unit is m
2
Described strength of the mixing pile is 3 times of stake top stress, and promptly strength of the mixing pile meets following formula
R-strength of the mixing pile in the formula;
R
k-bearing capacity of single pile characteristic value;
A
P---the sectional area of stake.
The displacement pile spacing of described arranged in squares meets following formula
S=d
e/ 1.13, and
S in the formula---displacement pile spacing;
D---pile body average diameter;
d
e---equivalent diameter;
M---area replacement ratio;
The quantity in circular stake hole (i.e. displacement stake) is determined by following formula
In the formula
A---foundation area, unit are m
2
A
P---dowel section area, unit are m
2
n
p---theory when area the is A number that lays out pile.
To single footing, box foundation, raft foundation, edge of foundation is 150mm to the centre distance of displacement stake for replacing stake external diameter or its minimum value; To strip foundation, minimum value is 75mm.
Described concrete cushion is the C10 concrete cushion, and thickness is 30cm.
Described dado thickness is 150mm, and the height of single hop retaining wall joint is 1m, and retaining wall and pile body all are that concrete is made, and both strength grade of concrete are identical.
When if the characteristic load bearing capacity of strong-weathered rock can not meet design requirement, should be with middle decomposed rock as bearing stratum, described displacement stake enters bearing stratum 0.5m, and the aspect ratio stake top design elevation of actual pile exceeds 0.10m～0.20m.
Above-mentioned soft rock manually cut the earth the displacement pile composite foundation job practices comprise the steps:
A0. levelling of the land;
A. measure the fixed stake of unwrapping wire position (deciding the stake position) according to red line or axis that unit in charge of construction provides;
B0. indispensable facility is excavated in preparation;
B. dig a hole earthwork, formwork, build the retaining wall concrete, check a stake position axis;
C. clear up stake hole bottom residues;
D. stake bore dia, the degree of depth, pile center's axis, bearing stratum are inspected for acceptance;
E. stake hole back cover;
F. concreting in lifts is to design elevation;
G. repeat above-mentioned steps and finish other construction.
Among the described step b, to the section construction of each section retaining wall joint, concrete steps are: dig first section stake hole earthwork earlier, formwork, build first section retaining wall joint concrete, on this retaining wall joint, make stake position cross iron nail, check stake position axis, treat that this section retaining wall joint concrete reaches intensity, form removal is also excavated second section stake hole earthwork, and second section retaining wall joint concrete fixed, built in check vertical degree of the peg hole and diameter and formwork, inspection; With above-mentioned step cycle construction, until reaching projected depth.
After construction was finished, the artificial displacement pile composite foundation of cutting the earth adopted composite foundation checked and accepted and detects the checking that is converted into composite foundation design operation parameter and detect, and checks the reliability of processing scheme according to testing result.The detection particular content is:
1. detect the stake end end resistance characteristic value q of rock with the deep-well load test
Pa
2. adopt low Strain Method that pile body integrity is detected, quantity is 20% of hand excavated pile sum.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202229903U CN201339186Y (en) | 2008-11-28 | 2008-11-28 | Soft rock concrete replacement pile composite foundation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202229903U CN201339186Y (en) | 2008-11-28 | 2008-11-28 | Soft rock concrete replacement pile composite foundation |
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| Publication Number | Publication Date |
|---|---|
| CN201339186Y true CN201339186Y (en) | 2009-11-04 |
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| CNU2008202229903U Expired - Fee Related CN201339186Y (en) | 2008-11-28 | 2008-11-28 | Soft rock concrete replacement pile composite foundation |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102493473A (en) * | 2011-12-13 | 2012-06-13 | 中国建筑西南勘察设计研究院有限公司 | Replacement composite foundation for shallow-layer jet-grouting reinforced piles and deep-layer plain concrete piles |
| CN103046529A (en) * | 2012-12-31 | 2013-04-17 | 中国建筑西南勘察设计研究院有限公司 | Rammed hard plain concrete pile composite foundation |
| CN106087957A (en) * | 2016-06-03 | 2016-11-09 | 浙江圣井电力安装工程有限公司 | Power distribution room cable duct anti-settling method is built on a kind of coastal sludge matter soil |
| CN106381867A (en) * | 2016-08-31 | 2017-02-08 | 中铁二十局集团第四工程有限公司 | Construction method of large-diameter digging pile in subway station on upper-soft and lower-hard stratum |
| CN111719580A (en) * | 2019-03-21 | 2020-09-29 | 深圳墨泰建筑设计与咨询股份有限公司 | Basement anti-floating pile foundation |
-
2008
- 2008-11-28 CN CNU2008202229903U patent/CN201339186Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102493473A (en) * | 2011-12-13 | 2012-06-13 | 中国建筑西南勘察设计研究院有限公司 | Replacement composite foundation for shallow-layer jet-grouting reinforced piles and deep-layer plain concrete piles |
| CN103046529A (en) * | 2012-12-31 | 2013-04-17 | 中国建筑西南勘察设计研究院有限公司 | Rammed hard plain concrete pile composite foundation |
| CN106087957A (en) * | 2016-06-03 | 2016-11-09 | 浙江圣井电力安装工程有限公司 | Power distribution room cable duct anti-settling method is built on a kind of coastal sludge matter soil |
| CN106381867A (en) * | 2016-08-31 | 2017-02-08 | 中铁二十局集团第四工程有限公司 | Construction method of large-diameter digging pile in subway station on upper-soft and lower-hard stratum |
| CN106381867B (en) * | 2016-08-31 | 2019-01-22 | 中铁二十局集团第四工程有限公司 | Upper-soft lower-hard ground subway station large-diameter bored pile construction method |
| CN111719580A (en) * | 2019-03-21 | 2020-09-29 | 深圳墨泰建筑设计与咨询股份有限公司 | Basement anti-floating pile foundation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091104 Termination date: 20161128 |