CN101565949A - Forming method of large shallow foundation pit with soft soil foundation - Google Patents
Forming method of large shallow foundation pit with soft soil foundation Download PDFInfo
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- CN101565949A CN101565949A CNA2008100528892A CN200810052889A CN101565949A CN 101565949 A CN101565949 A CN 101565949A CN A2008100528892 A CNA2008100528892 A CN A2008100528892A CN 200810052889 A CN200810052889 A CN 200810052889A CN 101565949 A CN101565949 A CN 101565949A
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Abstract
The invention relates to a forming method of a large shallow foundation pit with a soft soil foundation, which comprises the following steps: firstly, slope making: the slope making is performed for a soil body within 1.5-2.0 m under the earth surface of the foundation pit, the slope gradient is 1:1-1:0.5, and the side slope of the soil body is protected by adopting cement mortar with the proportion being 1:3; secondly, shoring: a shoring structural pile and a top beam are fixedly arranged near the wall of the foundation pit after the slope making, and the top level of the shoring structural pile and the top beam is 1.5-2.0 m less than that of the earth surface; thirdly, raining; fourthly, earthwork excavating; fifthly, pit bottom reinforcing: the pit bottom surface is reinforced by adopting a cement mixing method in a flower arrangement way, the reinforcement depth is 0.4-0.6 times of that of the foundation pit, and the foundation pit is formed after the bottom surface of the foundation pit is reinforced. The invention has simple construction method, good stability after forming and high safety factor and can effectively reinforce the shallow foundation pit, especially the large shallow foundation pit with a 3.5-6 m soft soil foundation in depth.
Description
Technical field
The present invention relates to building field, at the shallow foundation hole of dark 3.5～6m, especially a kind of forming method of large shallow foundation pit with soft soil foundation.
Background technology
In construction work, run into soft foundation through regular meeting, China to the technical finesse of soft foundation by being divided into several different stages period: 1. before the seventies in 20th century, be subjected to technical development immature, the restriction of economic condition poorness, be in design, to avoid the weak soil location consciously to build mostly, in order to avoid the increasing construction investment brings adverse consequences for again the use of building; 2. in 80～nineties of 20th century, because population expansion land resources growing tension, the technology of reinforced soft soil ground has also had significant progress simultaneously, economic condition makes moderate progress, various reinforcement of soft soil theories have obtained sufficient application and checking, the reinforcing soft foundation technology also obtains tremendous development, all has in different fields and dabbles; 3. after the nineties in 20th century, various weak soil base treatment technologies are used in various construction works widely.The large industry equipment Foundation Design much need be constructed on soft foundation now, often adopt large tracts of land unsplit bed(-)plate structure design in the design, this method for designing, though can reduce the load on the unit area of bottom surface, also saved the ground disposal cost, but some problem of soft foundation shallow foundation hole moulding is needed to be resolved hurrily, adopt shoveling to put sloping technology as traditional large tracts of land shallow foundation hole construction is main, but put sloping technology and often be subjected to the restriction of ambient conditions critically, when there are the construction of shallow foundation hole simultaneously in adjacent structure or periphery around the construction plant, the moulding in soft foundation shallow foundation hole can only take interim measures excavation and support is carried out in soft foundation shallow foundation hole, do not form a cover rounded system, therefore can't satisfy the requirement of large-area soft ground shallow foundation hole construction.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, provide that a kind of job practices is simple, the moulding rear stability is good, safety factor is high and can effectively reinforce a kind of forming method of large shallow foundation pit with soft soil foundation in dark 3.5～6m shallow foundation hole.
The present invention solves its technical problem and is achieved through the following technical solutions:
A kind of forming method of large shallow foundation pit with soft soil foundation, wherein this method comprises the steps:
(1). put the slope: the soil body in the absolute altitude H scope under the foundation ditch face of land is put the slope handle, the gradient is 1: 1～1: 0.5, and upper side slope adopts 1: 3 cement mortar and adds gauze wire cloth or bar dowel bank protection;
(2). supporting: the supporting and protection structure stake is packed in by the foundation pit walls of putting behind the slope, and supporting and protection structure pile beacon height is in the face of land 1.5～2.0m;
(3). precipitation: adopt Φ 500-600mm not have sandpipe well precipitation, well spacing 10～20m, at the bottom of the well depth at the bottom of the supporting and protection structure stake 5m;
(4). soil excavation: the soil body of first supporting excavates earlier in the foundation ditch, excavates behind the soil body of back supporting;
(5). the end, hole reinforces: the foundation ditch bottom surface reinforces adopts the cement mixing method Flower-inserting type to arrange that reinforcement depth is 0.4～0.6 times of foundation depth, and the foundation ditch bottom surface reinforces back foundation ditch moulding and finishes.
And the scope of the soil body being put absolute altitude H under the foundation ditch face of land of handling on the slope is 1.5≤H≤2.0m.
And, described supporting and protection structure stake is a cement mixing method, and the form of this cement mixing method is that single mutually folded cement mixing method, double mutually folded cement mixing method, the mutual prestack of arch form three rows are put one of them of cement steel pipe concrete castinplace pile cement mixing method, single mutually folded lock pin cement mixing method, double mutually folded lock pin cement mixing method.
And described supporting and protection structure stake is a steel sheet pile, installs Guan Liang in upper end, steel sheet pile side, and hat back absolute altitude is lower than the face of land 1.5～2.0m.
And described steel sheet pile adopts the I40B material, and its spread pattern is the six suitable fourth types that intersect, and perhaps three along intersecting fourth types.
And, be fixed with brace summer between the hat beam of described foundation ditch two walls.
Advantage of the present invention and beneficial effect are:
1. this shallow foundation hole forming method is put the slope processing with the soil body in absolute altitude H=1.5～2.0m scope under the foundation ditch face of land, the gradient is 1: 1～1: 0.5, upper side slope adopts 1: 3 cement mortar bank protection, glides into foundation ditch to reduce the upper strata soil body, improves the safety of foundation excavation.
2. this shallow foundation hole forming method is packed in supporting and protection structure stake and Guan Liang by the foundation pit walls of putting behind the slope, the supporting and protection structure stake is lower than the face of land 1.5～2.0m with hat back absolute altitude, and can adopt the supporting and protection structure stake of different forms according to the different soil bodys and peripheral situation, dewatering measure adopts Φ 500～600mm not have sandpipe well precipitation, well spacing 10～20m, well depth is lower than 5m at the bottom of the supporting and protection structure stake, the foundation ditch bottom surface reinforces adopts the cement mixing method Flower-inserting type to arrange, reinforcement depth is 0.4～0.6 times of foundation depth, the stability that helps the foundation ditch global formation, reduce the moisture content of the soil body, the generation of the depression of avoiding caving in.
3. job practices of the present invention is simple, and the moulding rear stability is good, and the safety factor height is that a kind of shallow foundation of can effectively reinforcing is cheated the especially forming method in the dark 3.5～6m large tracts of land of soft foundation shallow foundation hole.
Description of drawings
Fig. 1 is dark 3.5～6m large shallow foundation pit with soft soil foundation plan view;
Fig. 2 is that the A-A of Fig. 1 is to cross-sectional view.
The specific embodiment
The invention will be further described below by specific embodiment, and following examples are descriptive, is not determinate, can not limit protection scope of the present invention with this.
A kind of forming method of large shallow foundation pit with soft soil foundation, especially at the shallow foundation hole of dark 3.5～6m, this method comprises the steps:
(1). put the slope: the soil body in the absolute altitude H=2.0m scope under the foundation ditch face of land is put the slope handle, putting the gradient is 1: 1, and upper side slope adopts 1: 3 cement mortar 5 bank protection, and vertically adds bar dowel 7 (also can add gauze wire cloth) in cement mortar.
(2). supporting: the stake of present embodiment supporting and protection structure is to adopt steel sheet pile, its material adopts I40B, carrying out supporting calculates, steel sheet pile 1 is packed in by the foundation pit walls of putting behind the slope, hat beam 2 is packed in the upper end of steel sheet pile side, steel sheet pile is lower than face of land 2m with hat back absolute altitude, if steel sheet pile need bigger support force can be between the hat beam of foundation ditch two walls the uniform brace summer 3 (present embodiment has increased brace summer) that installs; The six suitable fourth types (as shown in Figure 1) that intersect that are arranged as of steel sheet pile, this steel sheet pile also can be that the three suitable fourth types that intersect are arranged; Supporting and protection structure stake in this method also can be cement mixing method, if the employing cement mixing method, its form can be put wherein a kind of type of cement steel pipe concrete castinplace pile cement mixing method, single mutually folded lock pin cement mixing method or double mutually folded lock pin cement mixing method for single mutually folded cement mixing method, double mutually folded cement mixing method, the mutual prestack of arch form three rows.。
(3). precipitation: adopt Φ 500mm not have sandpipe well 6 precipitation, well spacing 20m, well depth are lower than 5m at the bottom of the supporting and protection structure stake, adopt high-power submerged pump to draw water.
(4). soil excavation: adopt the go ahead of the rest soil body of first supporting in the excavation pit of excavator, the soil body of back excavation back supporting.
(5). the end, hole reinforces: the foundation ditch bottom surface reinforces adopts cement mixing method 4 Flower-inserting types to arrange that reinforcement depth is 0.4 times of foundation depth, and the foundation ditch bottom surface reinforces back foundation ditch moulding and finishes.
Claims (6)
1. forming method of large shallow foundation pit with soft soil foundation, it is characterized in that: this method comprises the steps:
(1). put the slope: the soil body in the absolute altitude H scope under the foundation ditch face of land is put the slope handle, the gradient is 1: 1～1: 0.5, and upper side slope adopts 1: 3 cement mortar and adds gauze wire cloth or bar dowel bank protection;
(2). supporting: the supporting and protection structure stake is packed in by the foundation pit walls of putting behind the slope, and supporting and protection structure pile beacon height is in the face of land 1.5～2.0m;
(3). precipitation: adopt Φ 500-600mm not have sandpipe well precipitation, well spacing 10～20m, at the bottom of the well depth at the bottom of the supporting and protection structure stake 5m;
(4). soil excavation: the soil body of first supporting excavates earlier in the foundation ditch, excavates behind the soil body of back supporting;
(5). the end, hole reinforces: the foundation ditch bottom surface reinforces adopts the cement mixing method Flower-inserting type to arrange that reinforcement depth is 0.4～0.6 times of foundation depth, and the foundation ditch bottom surface reinforces back foundation ditch moulding and finishes.
2. forming method of large shallow foundation pit with soft soil foundation according to claim 1 is characterized in that: the scope of the soil body being put absolute altitude H under the foundation ditch face of land of handling on the slope is 1.5≤H≤2.0m.
3. forming method of large shallow foundation pit with soft soil foundation according to claim 1, it is characterized in that: described supporting and protection structure stake is a cement mixing method, and the form of this cement mixing method is that single mutually folded cement mixing method, double mutually folded cement mixing method, the mutual prestack of arch form three rows are put one of them of cement steel pipe concrete castinplace pile cement mixing method, single mutually folded lock pin cement mixing method, double mutually folded lock pin cement mixing method.
4. forming method of large shallow foundation pit with soft soil foundation according to claim 1 is characterized in that: described supporting and protection structure stake is a steel sheet pile, installs Guan Liang in upper end, steel sheet pile side, and hat back absolute altitude is lower than the face of land 1.5～2.0m.
5. forming method of large shallow foundation pit with soft soil foundation according to claim 4 is characterized in that: described steel sheet pile adopts the I40B material, and its spread pattern is the six suitable fourth types that intersect, and perhaps three along intersecting fourth types.
6. forming method of large shallow foundation pit with soft soil foundation according to claim 1 is characterized in that: be fixed with brace summer between the hat beam of described foundation ditch two walls.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008100528892A CN101565949A (en) | 2008-04-25 | 2008-04-25 | Forming method of large shallow foundation pit with soft soil foundation |
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| CNA2008100528892A CN101565949A (en) | 2008-04-25 | 2008-04-25 | Forming method of large shallow foundation pit with soft soil foundation |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102011404A (en) * | 2010-11-24 | 2011-04-13 | 温州中城建设集团有限公司 | Pit supporting structure and construction method thereof |
| CN102477744A (en) * | 2010-11-23 | 2012-05-30 | 中国二十冶集团有限公司 | Pit excavation method in large-area pit with internal support under condition of soft soil foundation |
| CN102966109A (en) * | 2012-11-05 | 2013-03-13 | 天津二十冶建设有限公司 | Method for constructing zonal deep foundation pit bottom sealing of soft soil foundation |
| CN103924602A (en) * | 2014-04-30 | 2014-07-16 | 冯诚 | Deep soft soil foundation pit construction method |
| CN104515443A (en) * | 2013-09-27 | 2015-04-15 | 中国二十冶集团有限公司 | Deep foundation pit lithosphere blasting protection method |
| CN105089063A (en) * | 2015-08-28 | 2015-11-25 | 上海市政工程设计研究总院（集团）有限公司 | Lattice-shaped reinforcing structure used for pit bottom of foundation pit in soft soil area |
| CN105239581A (en) * | 2015-08-28 | 2016-01-13 | 上海市政工程设计研究总院（集团）有限公司 | Lattice-shaped strengthening method for bottom of foundation pit in soft soil area |
| CN107859022A (en) * | 2017-11-07 | 2018-03-30 | 中国能源建设集团广东省电力设计研究院有限公司 | Deep soft soil foundation stabilization and pattern foundation pit supporting structure co-ordinative construction |
| CN108086327A (en) * | 2018-01-19 | 2018-05-29 | 浙江省建建设集团有限公司 | A kind of special-shaped construction method of deep foundation ditch of adjacent subway tunnel |
| CN113529730A (en) * | 2021-07-28 | 2021-10-22 | 中建八局天津建设工程有限公司 | Construction method of foundation pit |
-
2008
- 2008-04-25 CN CNA2008100528892A patent/CN101565949A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102477744A (en) * | 2010-11-23 | 2012-05-30 | 中国二十冶集团有限公司 | Pit excavation method in large-area pit with internal support under condition of soft soil foundation |
| CN102477744B (en) * | 2010-11-23 | 2014-04-30 | 中国二十冶集团有限公司 | Pit excavation method in large-area pit with internal support under condition of soft soil foundation |
| CN102011404A (en) * | 2010-11-24 | 2011-04-13 | 温州中城建设集团有限公司 | Pit supporting structure and construction method thereof |
| CN102011404B (en) * | 2010-11-24 | 2012-07-04 | 温州中城建设集团有限公司 | Pit supporting structure and construction method thereof |
| CN102966109A (en) * | 2012-11-05 | 2013-03-13 | 天津二十冶建设有限公司 | Method for constructing zonal deep foundation pit bottom sealing of soft soil foundation |
| CN104515443A (en) * | 2013-09-27 | 2015-04-15 | 中国二十冶集团有限公司 | Deep foundation pit lithosphere blasting protection method |
| CN103924602A (en) * | 2014-04-30 | 2014-07-16 | 冯诚 | Deep soft soil foundation pit construction method |
| CN103924602B (en) * | 2014-04-30 | 2017-03-29 | 冯诚 | Deep Thick Soft Ground foundation ditch construction method |
| CN105089063A (en) * | 2015-08-28 | 2015-11-25 | 上海市政工程设计研究总院（集团）有限公司 | Lattice-shaped reinforcing structure used for pit bottom of foundation pit in soft soil area |
| CN105239581A (en) * | 2015-08-28 | 2016-01-13 | 上海市政工程设计研究总院（集团）有限公司 | Lattice-shaped strengthening method for bottom of foundation pit in soft soil area |
| CN107859022A (en) * | 2017-11-07 | 2018-03-30 | 中国能源建设集团广东省电力设计研究院有限公司 | Deep soft soil foundation stabilization and pattern foundation pit supporting structure co-ordinative construction |
| CN108086327A (en) * | 2018-01-19 | 2018-05-29 | 浙江省建建设集团有限公司 | A kind of special-shaped construction method of deep foundation ditch of adjacent subway tunnel |
| CN113529730A (en) * | 2021-07-28 | 2021-10-22 | 中建八局天津建设工程有限公司 | Construction method of foundation pit |
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Open date: 20091028 |