CN101538867A - Long-short pile composite foundation top-down construction method - Google Patents
Long-short pile composite foundation top-down construction method Download PDFInfo
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- CN101538867A CN101538867A CN200910037532A CN200910037532A CN101538867A CN 101538867 A CN101538867 A CN 101538867A CN 200910037532 A CN200910037532 A CN 200910037532A CN 200910037532 A CN200910037532 A CN 200910037532A CN 101538867 A CN101538867 A CN 101538867A
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Abstract
The invention discloses a long-short pile composite foundation top-down construction method, comprising: a) carrying out construction for a short pile according to the design requirement; b) casting foundation bottom plate and obligating a long-pile hole site during construction; c) constructing an upper structure; d) constructing a long pile; and e) closing a long-pile hole. In the invention, the short pile and soil form composite foundation to be loaded firstly, thereby improving the stress level of the short pile and the soil in early stage of loading and increasing the load sharing ratio of the short pile and the soil; afterwards, the long pile participates in the load, which is favorable for the short pile, soil and long pile to work together; besides, the vertical pressure of soil between piles is increased so that the lateral additional stress in the foundation is enhanced correspondingly, the frictional resistance around piles of the long pile and the short pile is improved, edge load effect is generated at the end of long pile, and the load ability of the long pile is enhanced; the design should consider the foundation bearing ability and settlement situation under two different foundation states which is similar to check calculation of composite beam during structural engineering; the long pile in the topdown construction is a soil extruding pile generally, and informatization feedback should be strengthened and parameters such as speed of pile construction should be strictly controlled, thereby preventing the quality of the short pile body from being affected. The invention is beneficial to improving the coaction level of piles in the long-short pile composite foundation, improves the safety and reliability of the composite foundation and shortens the construction period.
Description
Technical field
The present invention relates to a kind of length-long-short pile composite foundation top-down construction method, be applicable to the civil engineering groundwork basic field.
Background technology
Length-long-short pile composite foundation is a kind of NEW TYPE OF COMPOSITE ground, and its principle is to bear the superstructure load by long stake, stub and native acting in conjunction, and long stake rigidity is bigger usually, and stub rigidity is littler, and Long piles and short piles is generally constructed simultaneously in the conventional construction method.Therefore under load action, long stake is concentrated owing to rigidity than Da Yi stress takes place, and stub and soil played a role owing to less being difficult to of rigidity.Prior art generally improves stub and soil stress performance degree by measures such as mattress layers, but the participation acting in conjunction effect of stub and soil is bad under long stake, stub and native elastic modelling quantity differ greatly situation.
Summary of the invention
Technical problem to be solved by this invention provides a kind of length-long-short pile composite foundation top-down construction method, this method can avoid stub and soil stress performance to lag behind, improve the load share ratio of load-bearing initial stage stub and soil, solve long stake, stub and the inharmonic technical problem of soil distortion.
For this reason, length-long-short pile composite foundation top-down construction method provided by the invention comprises:
A) stub is by the designing requirement construction;
B) water and smash sole plate, reserve a long stake position, hole during construction;
C) construction superstructure;
D) the long stake of construction;
E) the long stake stake of sealing hole.
The present invention seals and lays particle diameter 2cm between long stake stake Kong Qianchang stake and the basis and add the coarse sand compacting with interior rubble.The long stake stake of sealing hole order makes overall arrangements according to former composite foundation differential settlement and upper load situation.C35 early strength micro expansion concrete is adopted in the long stake stake of sealing hole, and it has two effects: bear on the one hand stake and extrude compression; With the close combination of hole wall concrete surface, play the antiseepage effect on the other hand.
Fulfillment information construction of the present invention arranges resistance strain gage at bottom slab stress muscle position when sole plate is constructed, detect the sole plate stressing conditions by resistance strain gage during Superstructure Construction, determines long pile construction order and quantity according to the bottom slab stress situation.
In order to make the unlikely weak part that becomes the basis of sealing of hole concrete, the present invention has taked hole-sealing technology twice, for the first time the sealing of hole height be basic high by 1/4, adopt C40 high-strength epoxy mortar, hinged to guarantee that long stake and basis are connected to, the sealing of hole height be basic high by 3/4 for the second time, adopt the C40 slightly expanded concrete, the micro-expanding agent volume is 3% of a cement consumption, and the engineering time is 8-12h behind the sealing of hole for the first time, treats that the high-strength epoxy mortar gel time carries out after reaching requirement.
Because the present invention at first carries stub and native form compound foundation by contrary sequence method, stub and soil stress level have been improved at the loading initial stage, increased the load share ratio of stub and soil, after this long stake participates in carrying, is conducive to the better common work of stub, soil and long stake.In addition, the increase of inter-pile soil vertical pressure makes the corresponding enhancing of side direction additional stress in the ground, thereby has improved the pile perimeter resistance of long stake, stub, and produces side load effect at long stake stake end, has strengthened long bearing capacity of pile.Foundation bearing capacity when design will be considered two kinds of different ground states and sedimentation situation are similar to the checking computations of composite beam in the Structural Engineering.Long stake is generally Squeezing Soil Pile in the reverse construction, should strengthen information-based feedback, strictly controls the parameters such as pile driving construction speed, avoids the stub pile quality influenced.The present invention is conducive to improve pile soil common action degree in the length-long-short pile composite foundation, has improved the security reliability of composite foundation, and has shortened the duration.
Description of drawings
Fig. 1 phase I constructional aspect
Fig. 2 second stage constructional aspect
In each accompanying drawing: 1, cushion cap, 2, preformed hole, 3, stub, 4, the early strength micro expansion concrete, 5, C40 high-strength epoxy mortar, 6, rubble irritates coarse sand, 7, long stake.
The specific embodiment
As shown in Figure 1 and Figure 2, the construction sequence of length-long-short pile composite foundation top-down construction method provided by the invention comprises:
A) stub 3 is constructed by designing requirement, and is consistent with conventional method;
B) water and smash sole plate, reserve a long stake position, 7 hole during construction;
C) the local superstructure building structure of construction;
D) the long stake 7 of construction;
E) 7 holes of the long stake of sealing.
Wherein lay particle diameter 2cm between long stake and the basis and add the coarse sand compacting with interior rubble, sealing stake hole order makes overall arrangements according to upper building differential settlement and superstructure load distribution situation, and C35 early strength micro expansion concrete 4 is adopted in sealing stake hole.
When sole plate is constructed, at bottom slab stress muscle position resistance strain gage is set in order to increase construction precision, detects the sole plate stressing conditions by resistance strain gage during Superstructure Construction, determine sequence of construction and the quantity of long stake 7 according to the bottom slab stress situation.Taked hole-sealing technology in addition twice.For the first time the sealing of hole height be basic high by 1/4, adopt C40 high-strength epoxy mortar 5, to guarantee that long stake 7 is connected to hinged with the basis, for the second time the sealing of hole height be basic high by 3/4, adopt C40 slightly expanded concrete 5, the micro-expanding agent volume is 3% of cement consumption, and the engineering time is 8-12h behind the sealing of hole first time, treats to carry out after high-strength epoxy mortar 5 gelling times reach requirement.
The complete rear pouring cushion cap 1 of stub 3 constructions will be done preformed hole 2 when pouring cushion cap 1, should do necessary structure around the preformed hole 2 and process, and superstructure continues construction, long stake 6 and superstructure synchronous construction, and the Superstructure Construction number of plies is determined according to stub 3 bearing capacities.When Superstructure Construction to predetermined number of layers, according to superstructure sedimentation and load situation sealing of hole, lay 2cm rubbles on 7 tops of long stake before the sealing of hole and fill with coarse sands 6, water afterwards then C35 early strength micro expansion concrete 4.
Claims (10)
1, a kind of length-long-short pile composite foundation top-down construction method, it is characterized in that: construction sequence comprises:
A) stub is by the designing requirement construction;
B) water and smash sole plate, reserve a long stake position, hole during construction;
C) construction superstructure;
D) the long stake of construction;
E) the long stake stake of sealing hole.
2, length-long-short pile composite foundation top-down construction method according to claim 1 is characterized in that: lay particle diameter 2cm between long stake and the basis and add the coarse sand compacting with interior rubble.
3, length-long-short pile composite foundation top-down construction method according to claim 1 and 2 is characterized in that: sealing stake hole order makes overall arrangements according to upper building differential settlement and superstructure load distribution situation.
4, length-long-short pile composite foundation top-down construction method according to claim 3 is characterized in that: C35 early strength micro expansion concrete is adopted in sealing stake hole.
5, length-long-short pile composite foundation top-down construction method according to claim 1 and 2, when constructing, sole plate resistance strain gage is set at bottom slab stress muscle position, detect the sole plate stressing conditions by resistance strain gage during the superstructure construction, determine the sequence of construction and the quantity of long stake according to the bottom slab stress situation.
6, length-long-short pile composite foundation top-down construction method according to claim 4, when constructing, sole plate resistance strain gage is set at bottom slab stress muscle position, detect the sole plate stressing conditions by resistance strain gage during the superstructure construction, determine the sequence of construction and the quantity of long stake according to the bottom slab stress situation.
7, length-long-short pile composite foundation top-down construction method according to claim 1 and 2 has been taked hole-sealing technology twice.For the first time the sealing of hole height be basic high by 1/4, adopt C40 high-strength epoxy mortar, to guarantee that long stake is connected to hinged with the basis, for the second time the sealing of hole height be basic high by 3/4, adopt the C40 slightly expanded concrete, the micro-expanding agent volume is 3% of cement consumption, and the engineering time is 8-12h behind the sealing of hole for the first time, treats that the high-strength epoxy mortar gel time carries out after reaching requirement.
8, length-long-short pile composite foundation top-down construction method according to claim 3 has been taked hole-sealing technology twice.For the first time the sealing of hole height be basic high by 1/4, adopt C40 high-strength epoxy mortar, to guarantee that long stake is connected to hinged with the basis, for the second time the sealing of hole height be basic high by 3/4, adopt the C40 slightly expanded concrete, the micro-expanding agent volume is 3% of cement consumption, and the engineering time is 8-12h behind the sealing of hole for the first time, treats that the high-strength epoxy mortar gel time carries out after reaching requirement.
9, length-long-short pile composite foundation top-down construction method according to claim 4 has been taked hole-sealing technology twice.For the first time the sealing of hole height be basic high by 1/4, adopt C40 high-strength epoxy mortar, to guarantee that long stake is connected to hinged with the basis, for the second time the sealing of hole height be basic high by 3/4, adopt the C40 slightly expanded concrete, the micro-expanding agent volume is 3% of cement consumption, and the engineering time is 8-12h behind the sealing of hole for the first time, treats that the high-strength epoxy mortar gel time carries out after reaching requirement.
10, length-long-short pile composite foundation top-down construction method according to claim 6 has been taked hole-sealing technology twice.For the first time the sealing of hole height be basic high by 1/4, adopt C40 high-strength epoxy mortar, to guarantee that long stake is connected to hinged with the basis, for the second time the sealing of hole height be basic high by 3/4, adopt the C40 slightly expanded concrete, the micro-expanding agent volume is 3% of cement consumption, and the engineering time is 8-12h behind the sealing of hole for the first time, treats that the high-strength epoxy mortar gel time carries out after reaching requirement.
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| CN200910037532A CN101538867A (en) | 2009-02-25 | 2009-02-25 | Long-short pile composite foundation top-down construction method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102277876A (en) * | 2011-05-17 | 2011-12-14 | 石家庄铁道大学 | Multifunctional pile-raft foundation and construction process thereof |
| CN102493474A (en) * | 2011-12-13 | 2012-06-13 | 中国建筑西南勘察设计研究院有限公司 | Different-diameter reinforcement and replacement type equal-length plain concrete pile composite foundation |
| CN103388342A (en) * | 2013-07-30 | 2013-11-13 | 大连市建筑设计研究院有限公司 | Composite foundation and design method thereof |
| CN103498476A (en) * | 2013-10-14 | 2014-01-08 | 成军 | Major-diameter hole-forming pile pier foundation and net foundation slab reverse building construction method |
| CN104179105A (en) * | 2014-08-27 | 2014-12-03 | 中国地质大学（武汉） | Top-down rigid pile compound foundation construction method |
| CN104532868A (en) * | 2014-12-11 | 2015-04-22 | 西南交通大学 | Anchored high bearing platform grouped pile foundation building method for high-steep deformation slope area bridge |
| CN104711973A (en) * | 2015-01-07 | 2015-06-17 | 朱奎 | Construction method for small-diameter pile composite foundation |
| CN106703062A (en) * | 2017-01-18 | 2017-05-24 | 江苏卓典钻掘科技有限公司 | Non-continuous cushion layer composite foundation and construction method thereof |
-
2009
- 2009-02-25 CN CN200910037532A patent/CN101538867A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102277876A (en) * | 2011-05-17 | 2011-12-14 | 石家庄铁道大学 | Multifunctional pile-raft foundation and construction process thereof |
| CN102493474A (en) * | 2011-12-13 | 2012-06-13 | 中国建筑西南勘察设计研究院有限公司 | Different-diameter reinforcement and replacement type equal-length plain concrete pile composite foundation |
| CN103388342A (en) * | 2013-07-30 | 2013-11-13 | 大连市建筑设计研究院有限公司 | Composite foundation and design method thereof |
| CN103388342B (en) * | 2013-07-30 | 2015-05-20 | 大连市建筑设计研究院有限公司 | Composite foundation and design method thereof |
| CN103498476A (en) * | 2013-10-14 | 2014-01-08 | 成军 | Major-diameter hole-forming pile pier foundation and net foundation slab reverse building construction method |
| CN103498476B (en) * | 2013-10-14 | 2014-09-10 | 南通大学 | Major-diameter hole-forming pile pier foundation and net foundation slab reverse building construction method |
| CN104179105A (en) * | 2014-08-27 | 2014-12-03 | 中国地质大学（武汉） | Top-down rigid pile compound foundation construction method |
| CN104179105B (en) * | 2014-08-27 | 2017-06-13 | 中国地质大学（武汉） | A kind of contrary sequence method rigid pile composite foundation construction method |
| CN104532868A (en) * | 2014-12-11 | 2015-04-22 | 西南交通大学 | Anchored high bearing platform grouped pile foundation building method for high-steep deformation slope area bridge |
| CN104532868B (en) * | 2014-12-11 | 2016-01-06 | 西南交通大学 | High abrupt change shape sloped region bridge anchor pull-type high cap pile group basis construction method |
| CN104711973A (en) * | 2015-01-07 | 2015-06-17 | 朱奎 | Construction method for small-diameter pile composite foundation |
| CN106703062A (en) * | 2017-01-18 | 2017-05-24 | 江苏卓典钻掘科技有限公司 | Non-continuous cushion layer composite foundation and construction method thereof |
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Application publication date: 20090923 |