CN100526566C - Method for controlling foundation pit deformation by using time difference effect in foundation pit excavating process - Google Patents
Method for controlling foundation pit deformation by using time difference effect in foundation pit excavating process Download PDFInfo
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- CN100526566C CN100526566C CNB200610030131XA CN200610030131A CN100526566C CN 100526566 C CN100526566 C CN 100526566C CN B200610030131X A CNB200610030131X A CN B200610030131XA CN 200610030131 A CN200610030131 A CN 200610030131A CN 100526566 C CN100526566 C CN 100526566C
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Abstract
The invention provides a method which is to utilize the time difference effect to control the foundation pit deformation during the excavation of the deep foundation pit, the procedures sequentially comprises that: an underground enclosing construction is built at first; then a foundation pit is excavated within the scope of the underground enclosing construction; a steel support is built between the underground enclosing constructions in the foundation pit to resist the side pressure of the foundation pit earth with the increase of the depth of the foundation pit; prestressing force on the steel support is applied to control the deformation of the foundation pit; when the prestressed steel support cannot resist the side pressure with the increase of the depth of the foundation pit, the concrete is cast on the prestressed steel support and the excavation of foundation pit is suspended; to the foundation pit is excavated continuously after the concrete on the prestressed steel support solidifies and reaches the design strength. The method of the invention reasonably utilizes the time difference effect during the formation of the steel support and the reinforced concrete support, realizes the effective control on the deformation of the deep foundation pit while keeping the overall stability of the support structure.
Description
Technical field
The present invention relates to the realm of building construction, relate in particular to a kind of job practices of in Deep Excavation, controlling foundation pit deformation.
Technical background
Along with a large amount of rises of urban skyscraper and underground building, thereby produced a large amount of deep-foundation pit engineerings.Abroad, the degree of depth of foundation ditch has reached 74m.At home, the planar dimension of foundation ditch and the degree of depth are also in continuous increase, and as the golden trade mansion in Shanghai, its foundation ditch planar dimension has 170m * 150m, and the excavation of foundation pit degree of depth reaches 19.5m.Along with constantly the deepening of deep foundation ditch, become big, the technician also more and more payes attention to the influence that produces owing to the distortion in the Deep Excavation.In the process of deep pit digging, because the effect of soil pressure and water pressure, foundation ditch tends to produce certain deformation, no matter this distortion is for foundation ditch itself, or all can produces adverse influence for the adjacent structure and the underground utilities of foundation ditch, if deal with improperly, can cause immeasurable loss.
Control the distortion of deep foundation ditch, the most direct way is exactly that foundation pit support system is taked certain measure.Nowadays, in the deep-foundation pit engineering, the backing material that is adopted roughly has two classes: a class is that steel supports, its advantage be install, remove convenient, can be by applying prestressing force control foundation pit deformation, but that shortcoming is a rigidity is little, be out of shape greatlyyer, the supporting and protection structure resistance to overturning is poor; Another kind of is that steel concrete supports, and its advantage is that rigidity is big, distortion is little, and resistance to overturning is good, supports and reaches intensity and need the time but shortcoming is a concrete, and removing needs explosion, and can not prestressing.Two class backing materials respectively have its advantage, but shortcoming is also arranged.
Along with the cutting depth of deep foundation ditch continues to increase, lateral pressure also increases thereupon.According to engineering experience, in order to resist bigger lateral pressure, and controlled deformation, the lower support of deep foundation ditch tends to adopt steel concrete to support.Need the long time but the concrete support reaches intensity, unfavorable for the control foundation pit deformation, though there is the part engineering can select for use the soil mass consolidation measure to guarantee soil stabilization, cost is higher.So if can learn from other's strong points to offset one's weaknesses, the Deformation control of foundation ditch there is not little help surely to above-mentioned two class backing materials.
Summary of the invention
Because the above-mentioned defective of prior art, but technical problem to be solved by this invention provides the method that a kind of prestressing has the control foundation pit deformation of enough rigidity again
For achieving the above object, the invention provides the method for utilizing time difference effect control foundation pit deformation in a kind of Deep Excavation, may further comprise the steps:
Step 1, at first build underground exterior-protected structure;
After step 2, underground exterior-protected structure are finished, in described underground exterior-protected structure scope, begin excavation pit; Along with the increase of described foundation depth, in described foundation ditch, build steel work between the described underground exterior-protected structure and support to resist the lateral pressure of described foundation pit side-wall; And described steel work supported apply prestressing force;
Preferably, in step 1, described underground exterior-protected structure is concrete continuous wall or deep-mixed pile or bored pile.
Preferably, after step 2, according to the described excavation of foundation pit degree of depth, repeating step two is built the more than one described steel work support that keeps spacing.
Preferably, in step 3, the cross sectional shape that described steel work supports is " worker " font or " mouth " font or " II " font.
Preferably, after step 4, according to cutting depth, repeating step three, step 4 finish to excavating successively.
The method of control foundation pit deformation of the present invention, be supported on time difference effect on the formation time owing to rationally utilized steel work to support with steel concrete, but steel work is supported prestressing and steel concrete to be supported the advantage with sufficient intensity and is integrated, and successively complementary on the passive time period to foundation pit earth, realized effective control to deformation of deep excavation.
Above-mentioned time difference effect is in the method specifically: when excavation of foundation pit is in the more shallow degree of depth, because this moment, the lateral pressure of foundation ditch bottom was also little, so establishing common steel work earlier in the foundation ditch bottom supports, and can apply prestressing force simultaneously, the rigidity that this moment, steel work supported can satisfy the requirement of control than the distortion of shallow foundation hole, and above-mentioned technology cost is low, and the time is short;
When foundation ditch continued to excavate downwards, foundation ditch was in the stage deeply, and the lateral pressure of foundation ditch bottom obviously increases, and this moment, concreting around the steel work support was treated just to continue to excavate after concrete reaches predetermined strength before the continuation excavation.Because this moment, applied prestressed steel work and formed a common primary structure member with the concrete of building thereon, has the bigger characteristic of concrete rigidity, therefore this common primary structure member has enough bigger lateral pressures in rigidity opposing deep foundation ditch bottom, to satisfy the requirement of control than deformation of deep excavation.
Compare with traditional backing material, utilized the advantage of the above-mentioned common primary structure member of time difference effect to be: support with steel work and compare, the ratio of rigidity steel work supports wants big, and the energy force rate steel work of opposing lateral pressure and control displacement supports is eager to excel.Support is compared with steel concrete, because common primary structure member can apply prestressing force, and after the excavation of foundation pit, side direction resistance control displacement can be provided at once, do not reach after the intensity and do not need by the time concrete to support, so remedied the shortcoming that steel concrete is supported on formation initial stage rigidity deficiency greatly.
Be described further below with reference to the technique effect of accompanying drawing, to understand purpose of the present invention, feature and effect fully design of the present invention, concrete structure and generation.
Description of drawings
Fig. 1 is the construction view of a preferred embodiment of the present invention;
Fig. 2 is the schematic cross-section at A-A place among Fig. 1;
Fig. 3 is the construction view behind the concreting embodiment illustrated in fig. 1;
Fig. 4 is the schematic cross-section at B-B place among Fig. 3.
The specific embodiment
As Fig. 1, shown in Figure 3, utilize the method for time difference effect control foundation pit deformation in the Deep Excavation of the present invention, comprise the steps: successively
Step 1 is at first built at construction area and is built underground exterior-protected structure 1; Building underground exterior-protected structure 1 is this area construction means commonly used, and in the present embodiment, underground exterior-protected structure 1 is a concrete continuous wall.Obviously, underground exterior-protected structure 1 also can be other common structures of this area, as deep-mixed pile or bored pile, and plays same effect.
After step 2, according to foundation ditch 2 cutting depths, repeating step two build to keep the more than one steel work of spacing to support 3, and present embodiment repeating step 2 twice has been built three steel work and supported 3.
Special feature of the present invention is, in the step 3,, support 3 when being not enough to resist the lateral pressure that increases synchronously along with foundation ditch 2 degree of depth having applied prestressed steel work along with excavation is deepened, apply concreting 4 in the prestressed steel work support 3, and suspending excavation pit 2;
The principle of above-mentioned steps three is, has utilized steel work support 3 and the priority difference of concrete 4 on formation time, makes both in conjunction with forming a common primary structure member 5, i.e. the mixture of steel work support 3 and concrete 4.
In common primary structure member 5, the characteristic of steel work support 3 is to play foundation ditch 2 effect of timely support, and because but steel work supports 3 prestressing, the promptness of this supporting role to foundation ditch 2 is more obvious, further remedied concrete 4 in consolidation process rigidity inadequately, temporarily can not passive defective, make foundation ditch 2 obtain enough supports in this time period that concrete 4 is in consolidation process.After the concrete in the common primary structure member 54 is fixed,, after concrete 4 consolidation processes are finished, foundation ditch 2 is played the support of sufficient intensity because concrete has the characteristic of enough rigidity.Above-mentioned steel work support 3 and concrete 4 complementation on the formation supporting time section in common primary structure member 5, make common primary structure member 5 have multiple advantage concurrently: to support with steel work and compare, the ratio of rigidity steel work supports wants big, and the energy force rate steel work of opposing lateral pressure and control displacement supports is eager to excel; Support is compared with concrete, because common primary structure member 5 can apply prestressing force, and after the excavation of foundation pit, side direction resistance control displacement can be provided at once, do not reach after the intensity and do not need by the time concrete to support, so remedied the shortcoming that steel concrete is supported on formation initial stage rigidity deficiency greatly.
For obtaining good rigidity, as shown in Figure 2, in the present embodiment, the cross section of steel work support 3 is chosen for " mouth " font, and behind the concreting 4, the cross section of common primary structure member 5 is seen shown in Figure 4.
Thereafter, step 4 after prestressed steel work to be applied supports that concrete 4 on 3 is fixed and reaches design strength, continues excavation pit 2, to the engine request degree of depth.Because this moment, prestressed steel work support 3 and the common primary structure member 5 of building concrete 4 formation have thereon been applied, has the bigger characteristic of concrete rigidity, therefore this common primary structure member 5 has enough bigger lateral pressures in rigidity opposing foundation ditch 2 bottoms, to satisfy the requirement of control than deformation of deep excavation.
The method of control foundation pit deformation of the present invention, be supported on priority difference on the formation time owing to rationally utilized steel work to support with steel concrete, steel work supports prestressing and the concrete support has the advantage of sufficient intensity but combine, and on the passive time period, form complementation, realized effective control to deformation of deep excavation.
As a kind of improvement to present embodiment, after completing steps four, according to the requirement of foundation ditch 2 on cutting depth, repeat above-mentioned steps three, step 4 successively, there is spacing ground that same common primary structure member 5 repeatedly is set downwards, so that foundation ditch 2 is formed the supporting role of extending, to reaching engine request, excavation finishes.
As another improvement, in step 3, for obtaining good stressed effect or in conjunction with actual selection, steel work supports 3 cross sectional shape can also be chosen as " worker " font or " II " font etc.
In sum, be several preferred embodiment of the present invention described in this manual.All technician in the art all should be in claim protection domain of the present invention under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (5)
1, utilize the method for time difference effect control foundation pit deformation in a kind of Deep Excavation, may further comprise the steps:
Step 1, at first build underground exterior-protected structure;
After step 2, underground exterior-protected structure are finished, in described underground exterior-protected structure scope, begin excavation pit; Along with the increase of described foundation depth, in described foundation ditch, build steel work between the described underground exterior-protected structure and support to resist described foundation ditch earth lateral pressure; And described steel work supported apply prestressing force;
It is characterized in that: also comprise
Step 3, along with excavation is deepened, described when having applied the lateral pressure that prestressed steel work underbraced increases synchronously along with described foundation depth with opposing, apply concreting formation one common primary structure member in the prestressed steel work support described, and suspended the described foundation ditch of excavation;
Step 4, treat that described concrete in the described common primary structure member is fixed and reach design strength after, continue the described foundation ditch of excavation.
2, utilize the method for time difference effect control foundation pit deformation in the Deep Excavation as claimed in claim 1, it is characterized in that: in step 1, described underground exterior-protected structure is concrete continuous wall or deep-mixed pile or bored pile.
3, utilize the method for time difference effect control foundation pit deformation in the Deep Excavation as claimed in claim 1, it is characterized in that: after step 2, according to the described excavation of foundation pit degree of depth, repeating step two is built the more than one described steel work support that keeps spacing.
4, utilize the method for time difference effect control foundation pit deformation in the Deep Excavation as claimed in claim 1, it is characterized in that: in step 3, the cross sectional shape that described steel work supports is " worker " font or " mouth " font or " II " font.
5, utilize the method for time difference effect control foundation pit deformation in the Deep Excavation as claimed in claim 1, it is characterized in that: after step 4, according to cutting depth, repeating step three, step 4 finish to excavating successively.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB200610030131XA CN100526566C (en) | 2006-08-16 | 2006-08-16 | Method for controlling foundation pit deformation by using time difference effect in foundation pit excavating process |
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| CNB200610030131XA CN100526566C (en) | 2006-08-16 | 2006-08-16 | Method for controlling foundation pit deformation by using time difference effect in foundation pit excavating process |
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| CN101126240A CN101126240A (en) | 2008-02-20 |
| CN100526566C true CN100526566C (en) | 2009-08-12 |
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| CN102817372A (en) * | 2011-06-09 | 2012-12-12 | 五冶集团上海有限公司 | Construction method of underground deep foundation concrete by reverse formworks |
| CN102926328B (en) * | 2012-11-22 | 2015-04-01 | 江苏省交通工程集团有限公司 | Bridge waterside foundation pit excavation and support method and support wall structure |
| CN103205972B (en) * | 2013-03-19 | 2015-08-26 | 辽宁工程技术大学 | A kind of method analyzing foundation pit deformation and hole outer ground settlement relationship |
| CN104652443B (en) * | 2013-11-21 | 2017-03-29 | 中冶天工上海十三冶建设有限公司 | Construction method of the interim horizontal support of deep basal pit as permanent structure beam |
| CN103898919B (en) * | 2014-04-08 | 2015-10-14 | 山东金城建设有限公司 | Deep Excavation slope gradient control method |
| CN104631473B (en) * | 2015-01-19 | 2017-03-29 | 上海市基础工程集团有限公司 | The axle power of automatic servo steel supporting system applies construction method |
| CN107271278B (en) * | 2017-06-13 | 2019-07-05 | 上海交通大学 | The model assay systems and method of Circular Pit stage excavation supporting lateral pressure test |
| CN107389446B (en) * | 2017-06-13 | 2019-07-05 | 上海交通大学 | It is layered off-load and non-homogeneous sidesway supporting lateral pressure test model apparatus and method |
| CN115506364B (en) * | 2022-09-21 | 2024-04-30 | 中铁建工集团有限公司 | Construction method of foundation pit supporting structure |
| CN117904911A (en) * | 2024-03-20 | 2024-04-19 | 新乡中铁公路发展有限公司 | Construction method for underpass of existing line of newly-built line |
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