CN103161183A - Foundation reinforcement method of dry ash bank building - Google Patents
Foundation reinforcement method of dry ash bank building Download PDFInfo
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- CN103161183A CN103161183A CN2011104131037A CN201110413103A CN103161183A CN 103161183 A CN103161183 A CN 103161183A CN 2011104131037 A CN2011104131037 A CN 2011104131037A CN 201110413103 A CN201110413103 A CN 201110413103A CN 103161183 A CN103161183 A CN 103161183A
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Abstract
The invention relates to a civil engineering foundation reinforcement method, in particular to a foundation reinforcement method of a dry ash bank building at twice. The construction procedures comprises: (1) reinforcing the foundation for the first time, namely, arranging cement soil piles at the lower portion of a building foundation of the dry ash bank, and paving cushion layers on the cement soil piles; (2) reinforcing the foundation for the second time, namely, arranging shoulder-type cast-in-place piles and drawing-type cast-in-place piles respectively below two sides of the building foundation of the dry ash bank. The foundation reinforcement method of the dry ash bank building is obvious in treatment effect and has good technological benefit and social benefit.
Description
Technical field
The present invention relates to a kind of civil engineering groundwork reinforcement means, be specifically related to a kind of dry ash storehouse building lot reinforcement means at twice.
Background technology
In the construction work industry, generally at the bad local building of soil property, need to carry out consolidation process to ground, reinforcing and processing method commonly used generally has displacement method, preloading, compacting method etc.According to the difference of ground soil property, select diverse ways.Three general diameters in grey storehouse are 15m, high 34m, adjacent grey storehouse spacing 17m, and the basis is that 2m is thick whole board-like, construction area stratum, dry ash storehouse can be divided into 5 large layers and several subgrades from top to bottom take the Loessial silty clay as main, and layer is the Loessial silty clay 1., hardened condition, middle compression; Layer is the Loessial silty clay 2., and is hard; Layer is the Loessial silty clay 3., the tool low compressibility; 4. loess-like silt (saturated loess) of layer, in close, top is for wet, the bottom is for very wet, and is saturated; Layer is silty clay 5.: plastic state is main, local soft-plastic state.Have no underground water in the 60m depth bounds.
According to above-mentioned engineering geology and hydrogeological conditions, to twice consolidation process mode of dry ash storehouse building lot employing, cement earth pile is established in building foundation bottom, dry ash storehouse, lay mattress above cement earth pile and carry out ground stabilization for the first time, form semi-rigid composite foundation, castinplace pile is all established below the building foundation both sides in the dry ash storehouse, carries out ground stabilization for the second time with the cement-soil compacting method.
Summary of the invention
Problem to be solved by this invention is to provide a kind of dry ash storehouse building lot reinforcement means at twice, implements at twice different ground consolidation process modes, and requirement of engineering is satisfied in co-ordination.
For achieving the above object, the technical solution used in the present invention is:
A kind of dry ash storehouse building lot reinforcement means, its construction sequence comprises:
(1) ground stabilization for the first time: cement earth pile is established in building foundation bottom, dry ash storehouse, lays mattress layer above cement earth pile;
(2) ground stabilization for the second time: be respectively equipped with below building foundation both sides, dry ash storehouse and shoulder formula castinplace pile and pull-type castinplace pile.
During described step (1) is reinforced for the first time, the building method of cement earth pile is: with cement and soil by volume 1:7 to prepare burden into Soil-cement even, on collapsible loess, impact holing, meter stake top mark is high-3.40m, and construction stake top-3.10m is by a footpath d=0.5m, layering forms cement earth pile 3 with the cement-soil compacting, the long 12.0m of stake, pilespacing 1.1m, equilateral triangle lays out pile.
Mattress layer building method during described step (1) is reinforced for the first time is: after the cement earth pile detection is qualified, with slaked lime and soil by volume 2:8 prepare burden into sixteen dirt and stir, excavate cement earth pile top 0.30m, be backfilled to absolute altitude-3.10m with sixteen dirt compactions in layers, roll on cement earth pile and form the thick dirt mattress layer 2 of 0.3m, sixteen dirt coefficient of consolidation are not less than 0.98, form semi-rigid composite foundation.
The building method of shouldering the formula castinplace pile during described step (2) is reinforced for the second time is:
A, in a side of dry ash storehouse building foundation, borehole is to design elevation and expand at the end;
B, be placed in non-settlement by soaking soil layer at the bottom of shouldering the formula grout pile, the stake top is flat with the top, basis;
Bracket is made in c, stake top and basic joint, close contact at the bottom of bracket top and whole plate base, and bracket top stake is near whole plate, and basic side and basis hold out against;
D, placement reinforcing bar, elongated arrangement of reinforcement, main muscle are 16 Φ 25, and stirrup is Φ 8 spiral hoops, and hoop Φ 12 spacing 2m put more energy into;
E, this vicinity use the jack reinforcing to 1385kN on the basis, and after-pouring C30 concrete;
F, when concrete reaches 75% intensity, remove jack;
G, repetition a～f item, building is shouldered 18 of formula castinplace piles.
During described step (2) is reinforced for the second time, the building method of pull-type castinplace pile is:
A, to shoulder the formula filling pile construction complete, and at the opposite side of dry ash storehouse building foundation, borehole is to design elevation and expand at the end;
B, pull-type castinplace pile, an end, be placed in non-settlement by soaking soil layer, and stake top and basis are pushed up flat;
Bracket is made in C, stake top and basic joint, bracket main stress reinforcing bar 9 Φ 25 and building foundation bottom, dry ash storehouse master's muscle double welding 5d, then C30 concreting;
D, placement reinforcing bar, elongated arrangement of reinforcement, main muscle are 16 Φ 25, and stirrup is Φ 8 spiral hoops, and hoop Φ 12 spacing 2m put more energy into;
E, this vicinity use the jack reinforcing to 1385kN on the basis;
F, when concrete reaches 75% intensity, remove jack;
G, repetition A～F item are built 12 of pull-type castinplace piles.
0.8 meter, described grout pile footpath, stake is long 27 meters, and 1.6 meters, footpath, the end is expanded in castinplace pile end hole enlargement.
The present invention adopts cement earth pile, control soil with soil, can all eliminate well the settlement by soaking of soil, on the basis of original state bearing capacity of foundation slab, reduce the hole between grogs, improve close properties of soil, bearing capacity can satisfy the ground processing form of upper load requirement, cement earth pile, without arrangement of reinforcement, save the ground disposal cost, improve the original state foundation soil, gather materials on the spot.
The present invention adopts the thick sixteen thick mattress layers of dirt of 0.3m, makes cement earth pile and inter-pile soil collaborative work, can prevent the surface water under ooze impact on dry ash storehouse building foundation.
Bottom-enlarging filling pile of the present invention is pore-forming in non-settlement by soaking soil layer at the bottom of stake, takes full advantage of the end resistance that expands the bottom, reaches that to shorten stake long, improves the purpose of bearing capacity of single pile, stake week soil by compacted, the foundation soil mechanical index of compacting improves, the collateral resistance of stake improves.Shoulder the formula castinplace pile to the falling tendency of dry ash storehouse building foundation, have and shoulder the effect of.Pull-type castinplace pile top construction is to flat at the bottom of the building foundation of dry ash storehouse, reinforcing bar in stake welds mutually with the reinforcing bar that dry ash storehouse building foundation exhumes out, just can play the effect of drawing, so in the height of foundation scope, stake does not need, so also can save material, the reduction expense.Cement earth pile belongs to semi-rigid composite foundation, can with castinplace pile well together with cooperative bearing.Treatment effect of the present invention is obvious, and good technical benefits and social benefit are arranged.
Description of drawings
Fig. 1 embodiment of the present invention layout schematic diagram.
Fig. 2 A-A sectional view of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing, the present invention will be further described by embodiment;
As depicted in figs. 1 and 2, schematic diagram is arranged in dry ash storehouse building lot reinforcing, and its construction sequence comprises:
(1) ground stabilization for the first time: cement earth pile 3 is established in building foundation 1 bottom, dry ash storehouse, lays mattress layer 2 above cement earth pile 3;
(2) ground stabilization for the second time: be respectively equipped with below building foundation 1 both sides, dry ash storehouse and shoulder formula castinplace pile 4 and pull-type castinplace pile 5.
The building method of cement earth pile 3 is: with cement and soil by volume 1:7 to prepare burden into Soil-cement even, on collapsible loess, impact holing, meter stake top mark is high-3.40m, and construction stake top-3.10m is by a footpath d=0.5m, layering forms cement earth pile 3 with the cement-soil compacting, the long 12.0m of stake, pilespacing 1.1m, equilateral triangle lays out pile.
Mattress layer 2 building method are: after the cement earth pile detection is qualified, with slaked lime and soil by volume 2:8 prepare burden into sixteen dirt and stir, excavate cement earth pile top 0.30m, be backfilled to absolute altitude-3.10m with sixteen dirt compactions in layers, roll on cement earth pile and form the thick dirt mattress layer 2 of 0.3m, sixteen dirt coefficient of consolidation are not less than 0.98, form semi-rigid composite foundation.
The building method of shouldering formula castinplace pile 4 is:
A, in a side of dry ash storehouse building foundation, borehole is to design elevation and expand at the end;
B, be placed in non-settlement by soaking soil layer at the bottom of shouldering the formula grout pile, the stake top is flat with the top, basis;
Bracket is made in c, stake top and basic joint, close contact at the bottom of bracket top and whole plate base, and bracket top stake is near whole plate, and basic side and basis hold out against;
D, placement reinforcing bar, elongated arrangement of reinforcement, main muscle are 16 Φ 25, and stirrup is Φ 8 spiral hoops, and hoop Φ 12 spacing 2m put more energy into;
E, this vicinity use the jack reinforcing to 1385kN on the basis, and after-pouring C30 concrete;
F, when concrete reaches 75% intensity, remove jack;
G, repetition a～f item, building is shouldered 18 of formula castinplace piles.
Shoulder 0.8 meter, formula grout pile footpath, stake is long 27 meters, and 1.6 meters, footpath, the end is expanded in castinplace pile end hole enlargement.
The building method of pull-type castinplace pile 5 is:
A, to shoulder the formula filling pile construction complete, and at the opposite side of dry ash storehouse building foundation, borehole is to design elevation and expand at the end;
B, pull-type castinplace pile, an end, be placed in non-settlement by soaking soil layer, and stake top and basis are pushed up flat;
Bracket is made in C, stake top and basic joint, bracket main stress reinforcing bar 9 Φ 25 and building foundation bottom, dry ash storehouse master's muscle double welding 5d, then C30 concreting;
D, placement reinforcing bar, elongated arrangement of reinforcement, main muscle are 16 Φ 25, and stirrup is Φ 8 spiral hoops, and hoop Φ 12 spacing 2m put more energy into;
E, this vicinity use the jack reinforcing to 1385kN on the basis;
F, when concrete reaches 75% intensity, remove jack;
G, repetition A～F item, building is shouldered 12 of formula castinplace piles.
0.8 meter, pull-type grout pile footpath, stake is long 27 meters, and 1.6 meters, footpath, the end is expanded in castinplace pile end hole enlargement.
Three grey storehouses are that diameter is 15m, high 34m, and grey storehouse spacing 17m, the basis is that 2m is thick whole board-like, by the thick dirt mattress layer of 0.3m under the standard mattress layer, widely goes out basic outward flange 0.5m.Long 54.8m, wide 20.8m, gross area 1047m
2, the clean counter-force 200kPa in basis.
According to the Allowable value of foundation deformation of " Code for design of building " GB50007-2002 table 5.3.4 building, during highly less than or equal to 100m, the distortion permissible value is 400mm.Press the present invention and design, the clean counter-force in basis is 200kPa, adds that basis and soil weigh rear bearing capacity and uses 260kPa.
Cement earth pile of the present invention adopts a footpath to get d=0.5m, take non-collapsible soil as bearing stratum, according to embedded depth of foundation, effective length is 12.0m, lays out pile by equilateral triangle, and the centre distance between a hole can be 2.0～2.5 times an of bore dia, be 1.0m～1.25m, press the modular formula estimation:
S=0.95×d×[λ
cρ
dmax÷(λ
cρ
dmax-ρ
d)]
1/2=1.1(m)
By stake footpath 0.5m, the long 12.0m of stake, pilespacing 1.1m, the cement-soil filler, equilateral triangle lays out pile, and the estimation of Bearing Capacity of Composite Foundation characteristic value is as follows:
Replacement ratio m=d
2/ d
e 2=d
2/ (1.05s)
2=0.5
2/ (1.05 * 1.1)
2=0.1874
The vertical bearing capacity of single pile characteristic value is native and stake end soil resistance estimation by the stake side:
R
a=u
p∑q
sil
i+q
pA
P=275(kN)
The vertical bearing capacity of single pile characteristic value is pressed pile strength and is calculated:
R
a=ηf
cuA
P=259(kN)
Bearing Capacity of Composite Foundation characteristic value f
spk=mR
a÷ A
P+ β (1-m) f
Ak=386 (kPa)
The composite foundation compression modulus Es
1～2=f
spk÷ f
ak* 13=26 (MPa)
D=0.5m is got in the stake footpath, take non-collapsible soil as bearing stratum, according to embedded depth of foundation, the long 12.0m that gets of stake, pilespacing 1.1m, meter stake top mark is high-3.40m, and construction stake top-3.10m, cement-soil filler, equilateral triangle lays out pile, meter stake top mark is high-3.40m, and construction stake top-3.10m excavates top 0.30m, testing result: the Bearing Capacity of Composite Foundation characteristic value is 386kPa, the composite foundation modulus of compressibility is 26MPa, presses " Code for design of building " GB50007-2002 formula 5.3.5: calculating the foundation settlement value is 60mm, satisfies the requirement of Criterion restriction 400mm.Adopt the cement earth pile method to process this engineering dry ash storehouse ground, Bearing Capacity of Composite Foundation characteristic value and composite foundation modulus of compressibility calculate load with the dry ash storehouse and compare approachingly, and the foundation soil saturated yielding is eliminated, and this programme meets the demands.
The cement earth pile absolute altitude is-3.40m, is backfilled to-3.10m with sixteen dirt compactions in layers, and the characteristic load bearing capacity after the compaction in layers backfill is not less than 300kPa, and modulus of compressibility is not less than 20MPa, coefficient of consolidation 0.98.
According to place, dry ash storehouse geotechnical investigation data, for satisfying requirement for bearing capacity, as bearing course at pile end, grout pile footpath 0.8m expands footpath, end 1.6m with farinose argillic horizon, effective length 27m, and pro form bill pile vertical carrying capacity characteristic value is as follows:
R
a=[u∑q
sikl
i+ψ
pq
pkA
p]÷2=1385(kN)
The present invention is ground stabilization for the first time, and the clean counter-force of ground need reach 200kPa, ground stabilization for the second time, and bottom-enlarging filling pile can bear 1385 * 30=41550kN, is equivalent to the clean counter-force of ground and reduces 40kPa, reaches 20%, improves and reinforces for the first time holding capacity.
In addition drainage is arranged on ground at a distance, reduces net foundation pressure, effectively the measure of reducing settlement, be favourable to the sinking of alleviating the basis.
Claims (6)
1. dry ash storehouse building lot reinforcement means, its construction sequence comprises:
(1) ground stabilization for the first time: cement earth pile is established in building foundation bottom, dry ash storehouse, lays mattress layer above cement earth pile;
(2) ground stabilization for the second time: be respectively equipped with below building foundation both sides, dry ash storehouse and shoulder formula castinplace pile and pull-type castinplace pile.
2. dry ash according to claim 1 storehouse building lot reinforcement means, it is characterized in that: during described step (1) is reinforced for the first time, the building method of cement earth pile is: with cement and soil by volume 1:7 to prepare burden into Soil-cement even, on collapsible loess, impact holing, meter stake top mark is high-3.40m, construction stake top-3.10m, by stake footpath d=0.5m, layering forms cement earth pile 3, the long 12.0m of stake with the cement-soil compacting, pilespacing 1.1m, equilateral triangle lays out pile.
3. dry ash according to claim 1 storehouse building lot reinforcement means, it is characterized in that: the mattress layer building method during described step (1) is reinforced for the first time is: after the cement earth pile detection is qualified, with slaked lime and soil by volume 2:8 prepare burden into sixteen dirt and stir, excavate cement earth pile top 0.30m, be backfilled to absolute altitude-3.10m with sixteen dirt compactions in layers, roll on cement earth pile and form the thick dirt mattress layer 2 of 0.3m, sixteen dirt coefficient of consolidation are not less than 0.98, form semi-rigid composite foundation.
4. dry ash according to claim 1 storehouse building lot reinforcement means is characterized in that:
The building method of shouldering the formula castinplace pile during described step (2) is reinforced for the second time is:
A, in a side of dry ash storehouse building foundation, borehole is to design elevation and expand at the end;
B, be placed in non-settlement by soaking soil layer at the bottom of shouldering the formula grout pile, the stake top is flat with the top, basis;
Bracket is made in c, stake top and basic joint, close contact at the bottom of bracket top and whole plate base, and bracket top stake is near whole plate, and basic side and basis hold out against;
D, placement reinforcing bar, elongated arrangement of reinforcement, main muscle are 16 Φ 25, and stirrup is Φ 8 spiral hoops, and hoop Φ 12 spacing 2m put more energy into;
E, this vicinity use the jack reinforcing to 1385kN on the basis, and after-pouring C30 concrete;
F, when concrete reaches 75% intensity, remove jack;
G, repetition a～f item, building is shouldered 18 of formula castinplace piles.
5. dry ash according to claim 1 storehouse building lot reinforcement means is characterized in that:
During described step (2) is reinforced for the second time, the building method of pull-type castinplace pile is:
A, to shoulder the formula filling pile construction complete, and at the opposite side of dry ash storehouse building foundation, borehole is to design elevation and expand at the end;
B, pull-type castinplace pile, an end, be placed in non-settlement by soaking soil layer, and stake top and basis are pushed up flat;
Bracket is made in C, stake top and basic joint, bracket main stress reinforcing bar 9 Φ 25 and building foundation bottom, dry ash storehouse master's muscle double welding 5d, then C30 concreting;
D, placement reinforcing bar, elongated arrangement of reinforcement, main muscle are 16 Φ 25, and stirrup is Φ 8 spiral hoops, and hoop Φ 12 spacing 2m put more energy into;
E, this vicinity use the jack reinforcing to 1385kN on the basis;
F, when concrete reaches 75% intensity, remove jack;
G, repetition A～F item are built 12 of pull-type castinplace piles.
6. according to claim 4 or 5 described dry ash storehouse building lot reinforcement means is characterized in that 0.8 meter, described grout pile footpath, and stake is long 27 meters, and 1.6 meters, footpath, the end is expanded in castinplace pile end hole enlargement.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110413103.7A CN103161183B (en) | 2011-12-13 | 2011-12-13 | Dry ash storehouse building lot reinforcement means |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110413103.7A CN103161183B (en) | 2011-12-13 | 2011-12-13 | Dry ash storehouse building lot reinforcement means |
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| Publication Number | Publication Date |
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| CN103161183A true CN103161183A (en) | 2013-06-19 |
| CN103161183B CN103161183B (en) | 2015-08-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110413103.7A Expired - Fee Related CN103161183B (en) | 2011-12-13 | 2011-12-13 | Dry ash storehouse building lot reinforcement means |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110878553A (en) * | 2019-12-05 | 2020-03-13 | 万明明 | Construction method of continuous wall crossing deep-buried large municipal pipeline |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1058069A (en) * | 1991-06-26 | 1992-01-22 | 黄正轩 | The method of correcting and then reinforcing inclined house |
| CN1157873A (en) * | 1996-12-31 | 1997-08-27 | 林礼 | Straightening method for inclined house on soft ground foundation |
| JP2003147783A (en) * | 2001-11-16 | 2003-05-21 | Aichiken:Kk | Base isolation foundation of building and its construction method |
| CN2853905Y (en) * | 2005-07-06 | 2007-01-03 | 唐业清 | Foundation structure of anti-sink foundation |
-
2011
- 2011-12-13 CN CN201110413103.7A patent/CN103161183B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1058069A (en) * | 1991-06-26 | 1992-01-22 | 黄正轩 | The method of correcting and then reinforcing inclined house |
| CN1157873A (en) * | 1996-12-31 | 1997-08-27 | 林礼 | Straightening method for inclined house on soft ground foundation |
| JP2003147783A (en) * | 2001-11-16 | 2003-05-21 | Aichiken:Kk | Base isolation foundation of building and its construction method |
| CN2853905Y (en) * | 2005-07-06 | 2007-01-03 | 唐业清 | Foundation structure of anti-sink foundation |
Non-Patent Citations (3)
| Title |
|---|
| 何伟 等: ""夯实水泥土复合地基设计与施工研究"", 《铁道建筑》 * |
| 冯朝柱: ""电厂配电室设备基础地基的加固处理与应用"", 《科技传播》 * |
| 刘桂云: ""CFG桩复合地基在郑西客运专线的应用"", 《科学之友》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110878553A (en) * | 2019-12-05 | 2020-03-13 | 万明明 | Construction method of continuous wall crossing deep-buried large municipal pipeline |
| CN110878553B (en) * | 2019-12-05 | 2021-03-23 | 广东泓森建设有限公司 | Construction method of continuous wall crossing deep-buried large municipal pipeline |
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| CN103161183B (en) | 2015-08-19 |
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Address after: 450007 Zhengzhou Zhongyuan Road, Henan, No. 212 Patentee after: China Electric Power Construction Group Henan electric survey and Design Institute Co., Ltd. Address before: 450007 Zhengzhou Zhongyuan Road, Henan, No. 212 Patentee before: Hennan Electric Power Survey & Design Institute |
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