CN103243721A - Raft foundation and core tube excavation construction method of high-rise building under weak geological conditions - Google Patents
Raft foundation and core tube excavation construction method of high-rise building under weak geological conditions Download PDFInfo
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- CN103243721A CN103243721A CN2013101952708A CN201310195270A CN103243721A CN 103243721 A CN103243721 A CN 103243721A CN 2013101952708 A CN2013101952708 A CN 2013101952708A CN 201310195270 A CN201310195270 A CN 201310195270A CN 103243721 A CN103243721 A CN 103243721A
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- Prior art keywords
- core tube
- foundation
- raft foundation
- excavation
- raft
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- 238000009412 basement excavation Methods 0.000 title claims abstract description 46
- 238000010276 construction Methods 0.000 title claims abstract description 32
- 239000002689 soil Substances 0.000 claims abstract description 16
- 239000007921 sprays Substances 0.000 claims description 7
- 239000004570 mortar (masonry) Substances 0.000 claims description 3
- 239000010410 layers Substances 0.000 claims 1
- 239000011449 bricks Substances 0.000 abstract description 6
- 238000000034 methods Methods 0.000 abstract description 6
- 238000005507 spraying Methods 0.000 abstract 2
- 238000004873 anchoring Methods 0.000 abstract 1
- 230000002787 reinforcement Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 210000002219 Extraembryonic Membranes Anatomy 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Abstract
The invention discloses a raft foundation and core tube excavation construction method of a high-rise building under weak geological conditions. The raft foundation and core tube excavation construction method of the high-rise building under the weak geological conditions comprises the steps of before an earth excavation of a foundation ditch, utilizing a total station to measure and mark a raft foundation and a core tube sideline on a natural ground and utilizing a level to measure the elevation of the natural ground; utilizing a high-pressure jet grouting pile to subject the raft foundation and the core tube sideline to soil body reinforcement on the natural ground; performing the earth excavation of the raft foundation and the core tube foundation ditch; anchoring bolts around the raft foundation and the core tube foundation ditch; and performing C20 (Compress strength 20) concrete spraying around the raft foundation and the core tube foundation ditch. By utilizing construction methods of the high-pressure jet grouting pile, the bolts and the C20 concrete spraying, the raft foundation and core tube excavation construction method of the high-rise building under the weak geological conditions effectively guarantees the strength of a foundation slope structure, improves the safety performance, solves the problem of the increase of the excavating area of the raft foundation and the core tube due to the fact that the foundation ditch are easy to collapse and cannot form during a raft foundation and the core tube excavation process in a soft soil foundation, reduces the construction of brick film, and quickens the construction progress.
Description
Technical field
The present invention relates to a kind of underpin and excavation construction method, relate in particular to highrise building raft foundation and core tube excavation construction method under a kind of weak geological conditions
Background technology
When the foundation construction of highrise building high building, base form generally adopts raft foundation, and basic height generally reaches 2 meters, and the foundation ditch of core tube position is darker, reaches 5-6 rice, and the sectional dimension of core tube is little, and the excavation difficulty is big.Many bases are under the weak soil geological conditions, soil property is the weak soil of high-compressibility that mud and mucky soil are formed, this class soil natural moisture content height, void ratio is big, intensity is low, and is fixed slow, also has certain rheological behavior, excavation machinery and haulage vehicle are difficult for carrying out operation thereon, even if the construction operation face has been carried out brick slag place mat, but foundation ditch collapses easily in raft foundation and the core tube digging process, can't embark on journey, will increased area excavate raft foundation and core tube, carry out the construction of brick fetal membrane then, backfilling of earthwork is carried out in the zone of increased area excavation, so just increased workload, reduce the progress of foundation construction, increased cost.Therefore the construction for highrise building raft foundation under the weak geological conditions and core tube is necessary to propose a kind of new job practices, reduces unnecessary operation, and accelerating construction progress is saved cost.
Summary of the invention
Technical problem to be solved by this invention provides highrise building raft foundation and core tube excavation construction method under a kind of safe and reliable, weak geological conditions that application property is strong.
For realizing above-mentioned technique effect, the invention discloses highrise building raft foundation and core tube excavation construction method under a kind of weak geological conditions, may further comprise the steps:
Before pit earthwork excavation, at planar survey naturally and mark raft foundation and core tube sideline, adopt level gauge to natural ground mark height;
Adopt high-pressure rotary jet grouting pile that described raft foundation and core tube sideline are carried out soil stabilization on natural ground;
Carry out described raft foundation and core tube pit earthwork excavation;
Around described raft foundation and core tube foundation ditch, anchor into anchor pole;
Around described raft foundation and core tube foundation ditch, carry out C20 and spray concrete.
The present invention further improves and is that described high-pressure rotary jet grouting pile is double-row pile, diameter 800mm, and spacing 500mm, the long 6m of stake, stake top mark height designs end absolute altitude for foundation ditch.
The present invention further improves and is, the pit earthwork excavation comprised with the next stage:
Phase I: be excavated to hat top surface of the beam absolute altitude;
Second stage: first floor soil excavation;
Phase III: second layer soil excavation;
Quadravalence section: described raft foundation excavation of foundation pit;
Five-stage: described core tube excavation of foundation pit.
The present invention further improves and is, the parallel anchor pole of two rows of around described raft foundation and core tube foundation ditch, constructing, described anchor pole and horizontal direction angle are 15 °, and the anchor pole of described core tube anchors into length and anchors into length greater than the anchor pole of described raft foundation.
The present invention further improves and is that the thickness that described C20 sprays concrete is 80-100mm, and carries out mortar levelling on the concrete surface.
The present invention has been owing to adopted above technical scheme, makes it have following beneficial effect to be: effectively ensure the intensity of basic edge slope structure, improve safety; Adopt high-pressure rotary jet grouting pile, anchor pole, C20 to spray concrete construction method, solved in soft foundation, foundation ditch collapses easily in raft foundation and the core tube digging process, can't moulding, cause the problem of increased area excavation raft foundation and core tube, reduced the construction of brick fetal membrane, reduced workload, reduce cost, accelerated the progress of construction; The whole construction course construction technology is simple, and is convenient and easy.
Description of drawings
Fig. 1 is the floor map of job practices one preferred embodiments of the present invention.
Fig. 2 is the partial cutaway schematic of job practices one preferred embodiments of the present invention.
Fig. 3 is job practices pit earthwork excavation schematic diagram of the present invention.
Fig. 4 is job practices pit earthwork excavation schematic diagram of the present invention.
Fig. 5 is job practices pit earthwork excavation schematic diagram of the present invention.
Fig. 6 is job practices pit earthwork excavation schematic diagram of the present invention.
Fig. 7 is job practices pit earthwork excavation schematic diagram of the present invention.
Fig. 8 is job practices pit earthwork excavation schematic diagram of the present invention.
The specific embodiment
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Consult shown in Fig. 1～8, highrise building raft foundation and core tube excavation construction method are specific as follows under the weak geological conditions of the present invention:
1. before the pit earthwork excavation, adopt total powerstation to measure raft foundation 11 and core tube 12 sidelines on natural ground, and make a mark, adopt level gauge to natural ground mark height.
2. adopt 13 pairs of raft foundations 11 of high-pressure rotary jet grouting pile and core tube 12 sidelines to carry out soil stabilization on natural ground, high-pressure rotary jet grouting pile 13 is double-row pile, diameter 800mm, and spacing 500mm, the long 6m of stake, stake top mark height designs end absolute altitude for foundation ditch.High-pressure rotary jet grouting pile 13 constructions intert in engineering stake 14 constructions, and programming is not had influence.
3. carry out pit earthwork excavation, in conjunction with Fig. 3～shown in Figure 8, comprise with the next stage:
Phase I: be excavated to hat beam 17 end face absolute altitudes, as Fig. 3;
Second stage: the first floor soil excavation, as Fig. 4;
Phase III: second layer soil excavation, as Fig. 5;
The quadravalence section: raft foundation 11 excavation of foundation pit, as Fig. 6;
Five-stage: core tube 12 excavation of foundation pit, as Fig. 7 and Fig. 8.
4. the parallel anchor pole 15 of two rows of around raft foundation 11 and core tube 12 foundation ditch limits, constructing, anchor pole 15 is 15 ° with the horizontal direction angle, because core tube 12 foundation ditches are darker than raft foundation 11 degree of depth, easier collapsing anchors into length so the anchor pole 15 of core tube 12 anchors into length greater than the anchor pole 15 of raft foundation 11.
5. around raft foundation 11 and core tube 12 foundation ditches, carry out C20 and spray concrete 16, thickness 80-100mm, and carry out mortar levelling on the concrete surface, be convenient to carry out the next process waterproof construction.By this working procedure, reduced the brick fetal membrane construction of foundation ditch, shortened the duration.
Highrise building raft foundation and core tube excavation construction method have effectively ensured the intensity of basic edge slope structure under the weak geological conditions of the present invention, improve safety; Adopt high-pressure rotary jet grouting pile 13+ anchor pole 15+C20 to spray concrete 16 job practicess, solved in soft foundation, foundation ditch collapses easily in raft foundation 11 and core tube 12 digging processs, can't embark on journey, cause the problem of increased area excavation raft foundation 11 and core tube 12, reduced the construction of brick fetal membrane, reduced workload, reduce cost, accelerated the progress of construction; The whole construction course construction technology is simple, and is convenient and easy.
Below the present invention of embodiment has been described in detail by reference to the accompanying drawings, and those skilled in the art can make the many variations example to the present invention according to the above description.Thereby some details among the embodiment should not constitute limitation of the invention, and the scope that the present invention will define with appended claims is as protection scope of the present invention.
Claims (5)
1. highrise building raft foundation and core tube excavation construction method under the weak geological conditions is characterized in that described job practices may further comprise the steps:
Before pit earthwork excavation, at planar survey naturally and mark raft foundation and core tube sideline, adopt level gauge to natural ground mark height;
Adopt high-pressure rotary jet grouting pile that described raft foundation and core tube sideline are carried out soil stabilization on natural ground;
Carry out described raft foundation and core tube pit earthwork excavation;
Around described raft foundation and core tube foundation ditch, anchor into anchor pole;
Around described raft foundation and core tube foundation ditch, carry out C20 and spray concrete.
2. job practices as claimed in claim 1, it is characterized in that: described high-pressure rotary jet grouting pile is double-row pile, diameter 800mm, spacing 500mm, the long 6m of stake, the stake top mark is high to design end absolute altitude for foundation ditch.
3. job practices as claimed in claim 2 is characterized in that the pit earthwork excavation comprised with the next stage:
Phase I: be excavated to hat top surface of the beam absolute altitude;
Second stage: first floor soil excavation;
Phase III: second layer soil excavation;
Quadravalence section: described raft foundation excavation of foundation pit;
Five-stage: described core tube excavation of foundation pit.
4. job practices as claimed in claim 3, it is characterized in that: the parallel anchor pole of two rows of around described raft foundation and core tube foundation ditch, constructing, described anchor pole and horizontal direction angle are 15 °, and the anchor pole of described core tube anchors into length and anchors into length greater than the anchor pole of described raft foundation.
5. job practices as claimed in claim 4 is characterized in that: the thickness that described C20 sprays concrete is 80-100mm, and carries out mortar levelling on the concrete surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310195270.8A CN103243721B (en) | 2013-05-22 | 2013-05-22 | Highrise Building With Raft Foundation and Core Walls Structure excavation construction method under Unfavorable geology condition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310195270.8A CN103243721B (en) | 2013-05-22 | 2013-05-22 | Highrise Building With Raft Foundation and Core Walls Structure excavation construction method under Unfavorable geology condition |
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| Publication Number | Publication Date |
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| CN103243721A true CN103243721A (en) | 2013-08-14 |
| CN103243721B CN103243721B (en) | 2016-02-17 |
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| CN201310195270.8A CN103243721B (en) | 2013-05-22 | 2013-05-22 | Highrise Building With Raft Foundation and Core Walls Structure excavation construction method under Unfavorable geology condition |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105040705A (en) * | 2015-07-06 | 2015-11-11 | 广东省第四建筑工程有限公司 | Ground foundation treatment construction technology under multi-karst-cave geological conditions |
| CN109024657A (en) * | 2018-08-29 | 2018-12-18 | 中国建筑第八工程局有限公司 | The construction method of Super High Core Walls Structure dell side complex conditions tower crane |
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| CN101285309A (en) * | 2008-06-06 | 2008-10-15 | 南通华汇建筑工程有限公司 | Compound support method for deep foundation pit of tall buildings |
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| CN102425172A (en) * | 2011-12-05 | 2012-04-25 | 中冶天工集团有限公司 | Support method for excavating deep foundation pit closely adjacent to high-rise building |
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2013
- 2013-05-22 CN CN201310195270.8A patent/CN103243721B/en active IP Right Grant
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| KR20060023245A (en) * | 2004-09-09 | 2006-03-14 | (주)나인아키텍 | Method for constructing basement land-side protection wall in civil engineering |
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Cited By (3)
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| CN105040705A (en) * | 2015-07-06 | 2015-11-11 | 广东省第四建筑工程有限公司 | Ground foundation treatment construction technology under multi-karst-cave geological conditions |
| CN109024657A (en) * | 2018-08-29 | 2018-12-18 | 中国建筑第八工程局有限公司 | The construction method of Super High Core Walls Structure dell side complex conditions tower crane |
| CN109024657B (en) * | 2018-08-29 | 2020-09-15 | 中国建筑第八工程局有限公司 | Construction method of super high-rise core tube deep pit edge tower crane foundation under complex conditions |
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| Publication number | Publication date |
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| CN103243721B (en) | 2016-02-17 |
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