CN1109938A - Closed hyperboloid supporting structure for foundation pit cut and construction - Google Patents
Closed hyperboloid supporting structure for foundation pit cut and construction Download PDFInfo
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- CN1109938A CN1109938A CN 95102133 CN95102133A CN1109938A CN 1109938 A CN1109938 A CN 1109938A CN 95102133 CN95102133 CN 95102133 CN 95102133 A CN95102133 A CN 95102133A CN 1109938 A CN1109938 A CN 1109938A
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Abstract
The closed hyperboloid supporting structure for excavation of foundation pit features that the supporting structure has a surface of smooth and continuous closed symmetric non-concave curve structure and a retaining plane of hyperboloid with closed ring beams at top and bottom. Its construction method features symmetric excavation, jump construction, instantaneous supporting and overall monitor. The strength of concrete material and surrounding rock or earth body is fully used, so reducing cost by 30-40% and shortening engineering period by 20-30%.
Description
The invention belongs to the ground foundation engineering in the geotechnical engineering, is the supporting and protection structure and the construction of excavation of foundation pit.
In construction work, the excavation of foundation pit supporting directly has influence on economic benefit, social benefit and the environmental benefit of whole engineering.Current, both at home and abroad excavation of foundation pit supporting and protection structure generally adopts technology such as stake, wall, anchor, spray and gravity retaining structures, Z font soil-baffling structure, and these foundation pit supporting constructions all exist following disadvantage to some extent:
1, the supporting and protection structure form is unreasonable, and structure stress is science not, can not bring into play the compressive strength of concrete material and the intensity of the country rock soil body fully effectively, causes very serious waste.Stake, wall supporting and protection structure all belong to the cantilevered supporting structure system, it is excessive that supporting and protection structure just produces the concentrated local moment of flexure of internal force under horizontal force action, cross section reinforcing bar tension reaches design tensile strength and concrete crushing strength only is utilized 18-28%, causes the waste of 72-82% concrete strength; Simultaneously, cantilevered supporting and protection structure is stable for the assurance foundation ditch that reaches engineering support retaining soil, just must satisfy one times of build-in length that foundation ditch is dark, thereby causes the increase of construction investment.To gravity retaining structures, Z font soil-baffling structure (Chinese patent application number: 92110427.8 " closed arch ring retaining structure and job practicess thereof ") under the horizontal earth pressure effect, the native face of vertical retaining produces the structure effect of beam, in girder span, produce maximal bending moment, at this moment, the girder span reinforcing bar reaches design tensile strength, and total only can be utilized the 18-28% of concrete crushing strength, that is to say that the concrete strength of 72-82% is wasted.On the other hand, the distortion of beam makes structure depart from the country rock soil body, causes total can not utilize the effect of contraction of country rock soil body elastic resistance to supporting and protection structure, thereby can not improve supporting and protection structure internal force duty, causes the waste to the structural meterials and the country rock soil body.
2, construction environment is polluted.In the higher stratum of groundwater table, before construction stake and the wall, must take dewatering measure to foundation ditch, the precipitation power gradient is directly closed on the safety of building around the influence, even causes unequal settlement of building and inclination.Discharging, the processing of slurry coat method directly influence construction plant and surrounding environment when stake simultaneously, wall construction.Behind the anchor bolt construction left future trouble all in various degree ground contamination environment, cause difficulty for the construction of new construction from now on.
3, construction costs height, speed of application is slow.In the stratum of pore-forming grooving than difficulty, construction stake, wall construction must adopt auxiliary construction measures such as retaining wall or precipitation; Simultaneously, stake, wall, anchor, spray structure construction have adopted plant equipment, cause engineering cost to increase claim for eot.
The purpose of this invention is to provide a kind of scientific and rational closed hyperboloid supporting structure for foundation pit cut and construction, the stressed work of its supporting and protection structure can make full use of the intensity of structural meterials and the intensity of the country rock soil body, have characteristics such as structure stress is reasonable, the duration is short, cost is low, safe and reliable, be fit to various excavation of foundation pit supportings.
Closed hyperboloid supporting structure for foundation pit cut of the present invention and construction is characterized in that: the plane of supporting and protection structure is the closed symmetrical non-sag vertical curve structure of smooth and continuous, and it is hyperboloid that structure is kept off native face, respectively establishes closed collar tie beam at the top of the native face structure of retaining with the bottom.
Closed hyperboloid supporting structure for foundation pit cut of the present invention, when excavation of foundation pit deeply more than 15 meters the time, set up the closed collar tie beam in 2-3 road at the native face structure of retaining middle part.
At 0.1-0.18, structural thickness is at 0.3-0.5 rice than scope for the side kiln crown of described hyperboloid soil-baffling structure.
The plan-position that sets out supporting and protection structure is at first surveyed in closed hyperboloid supporting structure for foundation pit cut of the present invention and construction on the place of " three supplies and one leveling ", find out the coordinate control point, makes the back timber position, the back timber of constructing then; After back timber intensity reached 70%, with regard to sectional, merogenesis, symmetry, job-hopping excavation, every section long 5-6 rice of excavation excavated the high 2-3 rice of every joint downwards, behind excavation, concrete perfusion, and instant supporting; After concrete strength reaches 70%, the excavation adjacent segment of just can job-hoping, it is closed fully to bottom ring beam to construct, after concrete reaches design strength, just can be comprehensively excavation pit successively, until design substrate absolute altitude.
Closed hyperboloid supporting structure for foundation pit cut of the present invention and construction, in Excavation Process, at first soil pressure acts on the hyperboloid soil-baffling structure, make structure produce internal force and distortion, malformation is subjected to the constraint of country rock soil body elastic resistance, thereby changes the structural internal force duty, makes structural internal force based on axle power, evenly distribute along axis, at this moment just utilized concrete compressive strength of soil-baffling structure and country rock soil strength fully; On the other hand, when soil pressure acts on the hyperboloid soil-baffling structure, the back timber of supporting and protection structure and bottom girder are subjected to uniform horizontal applied force, to the closed non-sag vertical curve structure of continuous smooth symmetry, under even horizontal external effect, its structural internal force is based on axle power, evenly distribute along axis, make structural internal force keep self equilibrium state, therefore, given full play to the concrete compressive strength of collar tie beam again.
Closed hyperboloid supporting structure for foundation pit cut of the present invention and construction, its economic worth are to reduce construction costs 30-40%(and compare with stake, wall retaining support structure), shorten construction period 20-30%, accelerating construction progress; Learning value has been the supporting and protection structure form scientific, has changed the structure stress duty, has fully excavated the intensity of the concrete intensity and the country rock soil body; Social value is to have opened up remaining labour market; The value of environmental protection is that the environment around the engineering is not had any pollution and interference.
Closed hyperboloid supporting structure for foundation pit cut of the present invention and construction are applicable to any excavation of foundation pit supporting.
Below in conjunction with drawings and Examples closed hyperboloid supporting structure for foundation pit cut of the present invention and construction are described further.
Fig. 1 is the plan view of closed hyperboloid supporting structure for foundation pit cut
Fig. 2 is the sectional drawing of closed hyperboloid supporting structure for foundation pit cut
Fig. 3 is the construction sequence figure of closed hyperboloid supporting structure for foundation pit cut
Wherein: 1 is the top collar tie beam, and 2 is bottom ring beam, and 3 is the hyperboloid soil-baffling structure, and 4 is interim the support.
Embodiment 1:
Dark-14 meters of excavation of foundation pit, engineering geology is followed successively by: 2 meters of backfill, 2 meters of cohesive soil plastic states, 2.5 meters of silty clay plastic states, 12.5 meters of silty clay soft-plastic states, 6.5 meters of flour sand dense states.Substrate drops on farinose argillic horizon, adopts circular closure hyperboloid soil-baffling structure, 50 meters of excavation of foundation pit diameters, and wide 2 meters, thick 0.75 meter of collar tie beam keeps off thick 0.3 meter of native face structure, and the side kiln crown is than 0.12.No any support in the foundation ditch.
Construction sequence: remove backfill-2 meter, the top collar tie beam of constructing at-2.75 meters, long 3.14 meters of excavation section by section, the excavation merogenesis is high 3 meters downwards, symmetry job-hopping excavation and concrete perfusion set up interim support afterwards immediately, and be closed fully until the bottom girder construction, concrete reaches design strength, just excavation pit successively comprehensively.
Embodiment 2:
Dark-7.5 meters of excavation of foundation pit, engineering geology is followed successively by: backfill 2-2.5 rice, 2.7 meters of clay silt plastic states, 3 meters of silty claies, powder fine sand 1.2-0.5 rice, gravel layer 3-5 rice.Substrate drops on farinose argillic horizon, adopts closed hyperboloid soil-baffling structure, and the plane is made up of 2 groups of elliptic curve structures, and section is the hyperboloid soil-baffling structure, and the side kiln crown is than 0.1, and the excavation of foundation pit area is 5608 square metres.
Construction sequence: remove backfill-2 meter, the top collar tie beam of constructing at-2.5 meters, collar tie beam is wide 2 meters, and thick 0.5 meter, the long 6-6.5 rice of excavation section by section, the excavation merogenesis is high 3 meters and 2.5 meters downwards, symmetry job-hopping excavation and concrete perfusion set up interim support afterwards immediately, and be closed fully until the bottom girder construction, concrete reaches design strength, just excavation pit successively comprehensively.
Claims (4)
1, a kind of closed hyperboloid supporting structure for foundation pit cut and construction is characterized in that: the plane of supporting and protection structure is the closed symmetrical non-sag vertical curve structure of smooth and continuous, and it is hyperboloid that structure is kept off native face, respectively establishes closed collar tie beam at the top of the native face structure of retaining with the bottom.
2, closed hyperboloid supporting structure for foundation pit cut as claimed in claim 1 and construction is characterized in that: described soil-baffling structure is at the dark closed collar tie beam in 2-3 road of setting up in the middle more than 15 meters time of excavation of foundation pit.
3, closed hyperboloid supporting structure for foundation pit cut as claimed in claim 1 and construction is characterized in that: at 0.1-0.18, structure is thick in 0.3-0.5 rice than scope for described hyperboloid soil-baffling structure side kiln crown.
4, a kind of closed hyperboloid supporting structure for foundation pit cut and construction is characterized in that:
On the place of " three supplies and one leveling ", survey the plan-position set out supporting and protection structure, find out the coordinate control point, make the back timber position after, the construction back timber; After the back timber concrete strength reaches 70%, segmentation, merogenesis, symmetry, job-hopping excavation, every section long 5-6 rice of excavation excavates the high 2-3 rice of every joint downwards, behind excavation, concrete perfusion, after concrete strength reaches 70%, the excavation adjacent segment of just can job-hoping, it is closed fully to bottom ring beam to construct, after concrete reaches design strength, just can be comprehensively excavation pit successively, until design substrate absolute altitude.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95102133 CN1109938A (en) | 1995-03-10 | 1995-03-10 | Closed hyperboloid supporting structure for foundation pit cut and construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95102133 CN1109938A (en) | 1995-03-10 | 1995-03-10 | Closed hyperboloid supporting structure for foundation pit cut and construction |
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| CN1109938A true CN1109938A (en) | 1995-10-11 |
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| CN 95102133 Pending CN1109938A (en) | 1995-03-10 | 1995-03-10 | Closed hyperboloid supporting structure for foundation pit cut and construction |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101139839B (en) * | 2007-10-15 | 2010-09-01 | 上海市隧道工程轨道交通设计研究院 | Setting arrangement for high artesian area ultra-deep foundation pit |
| CN105507328A (en) * | 2015-09-08 | 2016-04-20 | 浙江中林勘察研究股份有限公司 | Arched supporting structure of foundation ditch and construction method thereof |
| CN111456030A (en) * | 2020-04-23 | 2020-07-28 | 东阳市君泰建筑工程有限公司 | Building foundation pit maintenance plate |
-
1995
- 1995-03-10 CN CN 95102133 patent/CN1109938A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101139839B (en) * | 2007-10-15 | 2010-09-01 | 上海市隧道工程轨道交通设计研究院 | Setting arrangement for high artesian area ultra-deep foundation pit |
| CN105507328A (en) * | 2015-09-08 | 2016-04-20 | 浙江中林勘察研究股份有限公司 | Arched supporting structure of foundation ditch and construction method thereof |
| CN111456030A (en) * | 2020-04-23 | 2020-07-28 | 东阳市君泰建筑工程有限公司 | Building foundation pit maintenance plate |
| CN111456030B (en) * | 2020-04-23 | 2021-06-25 | 东阳市君泰建筑工程有限公司 | Building foundation pit maintenance plate |
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