CN203546727U - Partition structure for controlling deformation of deep and large foundation pit - Google Patents
Partition structure for controlling deformation of deep and large foundation pit Download PDFInfo
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- CN203546727U CN203546727U CN201320620508.2U CN201320620508U CN203546727U CN 203546727 U CN203546727 U CN 203546727U CN 201320620508 U CN201320620508 U CN 201320620508U CN 203546727 U CN203546727 U CN 203546727U
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Abstract
The utility model provides a partition structure for controlling the deformation of a deep and large foundation pit, and relates to the technical field of engineering construction of a deep and large foundation pit. The partition structure aims at solving the problems of an existing construction method of the deep and large foundation pit that due to the overlarge excavation area and the irregular planar shape of the foundation pit, or adverse factors such as the existence of numerous important buildings within the scope affected by the excavation of the foundation pit, the construction of the deep and large foundation pit causes excessive effect on the surrounding environment, and the construction period is longer. The partition structure is characterized in that the deep and large foundation pit comprises a foundation pit I, a foundation pit II and a foundation pit III, which are arranged in sequence; the foundation pit I and the foundation pit III, located on two sides of the deep and large foundation pit, are not adjacent; when the deep and large foundation pit is in the shape of an irregular triangle, the foundation pit II is elongated; one end of the foundation pit II is located on the bevel edge of the deep and large foundation pit; the other end of the foundation pit II is located on the long side of the deep and large foundation pit; the foundation pit I and the foundation pit III are both larger than the foundation pit II in area; when the deep and large foundation pit is elongated, the long side of the deep and large foundation pit is 250m to 350m long; the foundation pit II is greater than the foundation pit I and the foundation pit III in excavation depth.
Description
Technical field
The utility model relates to deep big foundation pit Construction Technology field, particularly a kind of partitioned organization of controlling deep big foundation pit distortion.
Background technology
Development along with urban construction; building is more and more intensive; underground structure and above-ground structures are interlaced; cause area and the degree of depth of base pit engineering constantly to increase; construction plant is more and more compacter, and red line is close in some place, makes foundation ditch periphery construction plant very narrow and small; and foundation ditch surrounding enviroment are complicated, responsive, close on a large amount of pipelines, Important building and subway structure etc., more and more higher to the requirement of surrounding enviroment protection.
Excavation of foundation pit can cause the stress field of foundation ditch and surrounding soil, displacement field to change, and the displacement visualize of foundation ditch and foundation ditch surrounding soil is the inside and outside vertical deformation of foundation ditch and the lateral deformation of space enclosing structure.When soft clay area construction deep big foundation pit, except meeting the intensity and safety of deep big foundation pit itself, main is to control the distortion that deep big foundation pit excavation produces, to meet the protection requirement of deep big foundation pit surrounding enviroment.Deep big foundation pit neighboring ground settlement and influence basin are except outside the Pass the soil properties of planning to build place with engineering has, main influence factor is the lateral displacement of space enclosing structure and the protuberance of the interior soil body of deep big foundation pit, and the interior protuberance of the soil body of deep big foundation pit and the width of foundation ditch, excavation area and cutting depth are closely related.
From above-mentioned deep big foundation pit deformation mechanism and signature analysis, controlling deep big foundation pit outside ground settlement is mainly to control the lateral deformation of space enclosing structure and the protuberance of the interior soil body of foundation ditch.For the lateral deformation of space enclosing structure, can realize by improving the rigidity of space enclosing structure, increase measures such as inserting ratio and the road number supporting and rigidity.But because deep big foundation pit cutting depth is dark and area is large, the distortion many and that produce of disposable off-load amount are very rambunctious.For this reason, Shanghai City building supervision department clearly proposes in (2012) No. 645 files are established diplomatic relations in Shanghai, for the buildings such as hospital, school, house and protection building on the natural ground within the scope of influence of foundation excavation or stub basis, should consider foundation ditch environmental protection grade by important building; The deep big foundation pit of overlarge area should be gone along with sb. to guard him and construct by subregion, to reduce engineering risk and environmental risk.
Minute hole construction method refer to according to foundation ditch dig deeply, the situation such as field construction condition, foundation ditch is divided into some, compartment wall is set between piece and piece, press the principle of " become greatly little, break the whole up into parts ", piecemeal carries out the construction of supporting, soil excavation and underground structure.That minute hole construction method has is less on foundation ditch surrounding enviroment impacts, the input of working sources more effectively, construction and management more rationally and the safety of base pit engineering high more, be used in recent years in numerous items, having become the engineering construction of solution deep big foundation pit affects one of effective method of this conspicuous contradiction on surrounding enviroment.
Chinese invention patent application numbers 201210533192.3, name is called subregion off-load and controls in the technical scheme of system and method for deep big foundation pit distortion, by together interim compartment wall is set in the hole in the contiguous object of protection side of deep big foundation pit, deep big foundation pit is divided into two regions of fillet foundation ditch away from large foundation ditch and the contiguous object of protection of object of protection, first excavate large foundation ditch, after completing large base plate of foundation pit and build by rapid construction, excavate again fillet foundation ditch, adopt steel axial force of the supports servo-drive system to carry out Deformation control to the space enclosing structure of fillet foundation ditch, the lateral deformation of the space enclosing structure of grading control deep big foundation pit, thereby the safety of the object of protection of the contiguous deep big foundation pit of protection.In manual, enumerated floor space 10000m
2, the solution of the deep big foundation pit engineering that is close to subway tunnel of cutting depth 17.5m～25.4m.
But, when deep big foundation pit project occupation of land area reaches 20000m
2above, dig and be deeply greater than 12.0m, and while thering is concave plane shape; Or when deep big foundation pit excavates the situation of the important buildings such as hospital, school, house and protection building that have many natural grounds or stub basis in influence basin, technique scheme can not meet construction requirement.Therefore, for solving above-mentioned unfavorable factor, cause the problem that deep big foundation pit engineering construction is excessive on surrounding enviroment impact and the construction period is longer, need to improve the partitioned organization of existing control deep big foundation pit distortion, to meet the construction requirement of deep big foundation pit engineering.
Summary of the invention
Partition system for existing deep big foundation pit, because excavation of foundation pit area is excessive and flat shape is irregular, or within the scope of influence of foundation excavation, there is the unfavorable factors such as many important buildings, cause the problem that deep big foundation pit construction is excessive on surrounding enviroment impact and the construction period is longer.The purpose of this utility model is to provide a kind of partitioned organization of controlling deep big foundation pit distortion.The utility model, by the rationalization partition to deep big foundation pit, can dwindle relative excavation area, reduces tau-effect, the shortening basic engineering construction duration of foundation ditch and improve construction effect.
The utility model solves the technical scheme that its technical problem adopts: described deep big foundation pit comprises foundation ditch one, foundation ditch two and the foundation ditch three being arranged in order, the described foundation ditch one and the foundation ditch three that are positioned at described deep big foundation pit both sides are non-conterminous, when the flat shape of described deep big foundation pit is sealene triangle, the plane of described foundation ditch two is elongated, one end of described foundation ditch two is positioned on the hypotenuse of described deep big foundation pit, the other end of described foundation ditch two is positioned on the long limit of described deep big foundation pit, and the area of described foundation ditch one and described foundation ditch three is all greater than the area of described foundation ditch two; When the flat shape of described deep big foundation pit is elongated, the length of long sides of described deep big foundation pit is 250 meters～350 meters, and it is dark that the digging of described foundation ditch two is all greater than digging of described foundation ditch one and described foundation ditch three deeply.
Further, the width of described foundation ditch two is more than or equal to 30 meters.
Effect of the present utility model is:
One, for construction area, surpass 20000m
2, shape is extremely irregular or dig and deeply differ and foundation ditch that drop is large, partitioned organization of the present utility model be by original deep big foundation pit be divided into a plurality of independently, relative less foundation ditch, and carry out respectively the construction of supporting, soil excavation and underground structure, shortened the length of side of foundation ditch, can effectively reduce the impact of excavation of foundation pit on its surrounding enviroment, effectively reduce " tau-effect ", thereby make the safety of base pit engineering higher.
Two, under different geological conditions, the failure mode of the soil body is different, soil pressure is not identical yet, at design aspect, the building-in depth of the fender post of foundation ditch, the situation of reinforcing in stake footpath size and hole is also not quite similar, therefore, partitioned organization of the present utility model is divided according to the engineering geological conditions of planning to build place, can make full use of construction plant, can utilize rear excavation plot as the construction plant of first excavating plot, then utilize and first complete the plot of sole plate construction as the construction plant in rear excavation plot, be particularly suitable for the restricted super-giant foundation pit work items in construction plant, solved because of the limited problem that causes construction plant anxiety in foundation ditch place, improved the utilization rate of construction plant, be conducive to construction and management.In addition, with respect to the partition system that is divided into two regions in prior art, the utility model can drop into resource effectively, equably, avoids disposable a large amount of resource to drop into, and has better economic benefit.
Three, partitioned organization of the present utility model, for safe class, higher or environment Deformation control requires strict region, and design of its support rigidity is suitably large, for environment Deformation control, requires relatively loose region, and design of its support rigidity is economy suitably; In foundation pit construction process, run into unfavorable geological condition and excavation area when excessive again, the insertion depth of supporting and protection structure can be relatively large, and adopt partitioned organization of the present utility model, can guarantee under the prerequisite of foundation ditch safety, reduce to insert than saving material, to improve the economic benefit of deep big foundation pit engineering integral body.
Accompanying drawing explanation
Fig. 1 is the deep big foundation pit engineering general layout plan of the utility model embodiment mono-;
Fig. 2 is the deep big foundation pit engineering general layout plan of the utility model embodiment bis-.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, a kind of partitioned organization of controlling deep big foundation pit distortion the utility model proposes is described in further detail.According to the following describes and claims, advantage of the present utility model and feature will be clearer.It should be noted that, accompanying drawing all adopts very the form of simplifying and all uses non-ratio accurately, only in order to convenient, the object of aid illustration the utility model embodiment lucidly.
Embodiment mono-: in conjunction with Fig. 1, a kind of partitioned organization of controlling deep big foundation pit distortion of the present utility model is described, this engineering is planned to build seven layers of buildings, the shopping mall of F3/B3, Deep Foundation Pit floor space 80000m on the ground
2dig dark 16.0m, flat shape is irregular triangle (having minor face a, long limit b and hypotenuse c), because excavation of foundation pit area is excessive, if be divided into thing or construct in Liang Kuai region, north and south, though reduced the excavation area of deep big foundation pit, guaranteed the safety of base pit engineering, but be unfavorable for the construction of agent structure, extended the main structure construction duration.
In the partitioned organization of the present embodiment, deep big foundation pit 100 comprises three foundation ditches that are arranged in order, i.e. foundation ditch 1, foundation ditch 2 102 and foundation ditch 3 103, and the foundation ditch 1 and the foundation ditch 3 103 that are positioned at deep big foundation pit 100 both sides are non-conterminous.During construction, first excavation pit 1 and foundation ditch 3 103 also carry out inner support construction, centre reserves the foundation ditch 2 102 of strip, treat that foundation ditch 1 and foundation ditch 3 103 have excavated, return and build after base plate and basement, more reserved foundation ditch 2 102 before excavation, and construct to foundation ditch 2 102 and build base plate and basement, finally, foundation ditch 1, foundation ditch 2 102 and foundation ditch 3 103 are linked to be to integral body, complete construction.
Further, one end of the foundation ditch 2 102 of strip is positioned on the hypotenuse c of deep big foundation pit 100, and the other end of foundation ditch 2 102 is positioned on the long limit b of deep big foundation pit 100.Due in the process of foundation pit construction, the larger displacement of supporting facility generally occurs in the long limit of foundation ditch, and is span centre position, and minor face displacement is relatively little, position, turning, foundation ditch end especially, and displacement is minimum.Therefore, foundation ditch 2 102 the length of side that can reduce deep big foundation pit 100 is set, the displacement of supporting facility can be controlled in minimum scope, effectively reduce the impact of excavation of foundation pit on its surrounding enviroment, to reduce " long side effect ", thereby make the safety of base pit engineering higher.
Preferably, the area of foundation ditch 1 and foundation ditch 3 103 is all greater than the area of foundation ditch 2 102.Construction foundation pit 1 and foundation ditch 3 103 can shorten the duration of project subject structure to greatest extent simultaneously.
Preferably, the width of foundation ditch 2 102 is more than or equal to 30 meters, neither affects the construction of agent structure, can provide construction plant for the construction of agent structure again.
Partitioned organization of the present utility model, divides according to the engineering geological conditions of construction plant, foundation ditch character and surrounding enviroment.Concrete as the shape of foundation ditch, area, dig the situations such as dark, agent structure position and distribution.According to shape, dividing can clear and definite inner support bang path, improves the whole rigidity of going along with sb. to guard him system; According to area, divide the tau-effect that can effectively control foundation ditch; According to difference, dig and deeply can effectively control Eccentric Load for the impact of excavation of foundation pit, optimize the supporting and protection structure system of foundation ditch; According to agent structure, divide the object that can reach convenient construction.
The deep big foundation pit construction works of the present embodiment is by above-mentioned partitioned organization, first construction foundation pit 1 and foundation ditch 3 103 simultaneously, construction foundation pit 2 102 again, can accelerate the duration of main structure construction, the pressure that the disposable input of alleviation fund is excessive, reduced " three-dimensional effect " of foundation ditch simultaneously, guaranteed the construction safety of foundation ditch, improved the economic benefit of base pit engineering integral body.
Embodiment bis-: in conjunction with Fig. 2, a kind of partitioned organization of controlling deep big foundation pit distortion of the present utility model is described, this engineering is planned to build a dancing center, Deep Foundation Pit floor space 80000m
2, dig dark 6.8m～11.0m, flat shape is elongated, maximum span reaches more than 300 meters, periphery has 6 historical protective buildings (in accompanying drawing 2 shown in B1～B6), apart from excavation of foundation pit sideline nearest be only 3.7m.If foundation ditch is divided into hole construction in two pieces minutes, though reduced like this excavation area of foundation ditch, increased the safety of foundation ditch, can not farthest control the impact of excavation of foundation pit on periphery historical protective buildings.
Adopt the partitioned organization of the present embodiment; deep big foundation pit 200 comprises three foundation ditches that are arranged in order; i.e. the first foundation ditch 201, the second foundation ditch 202 and the 3rd foundation ditch 203; the first foundation ditch 201 and the 3rd foundation ditch 203 that area is close are non-conterminous, and protection building B1 and B2 are near the first foundation ditch 201, and protection building B3, B4 and B6 are near the second foundation ditch 202; B5 is near the 3rd foundation ditch 203 for protection building; in base, it is 11 meters deeply that the second foundation ditch 202 digs, and it is 6.8 meters deeply that the first foundation ditch 201 and the 3rd foundation ditch 203 dig.During construction, first excavate the second foundation ditch 202, after the second foundation ditch 202 is constructed and built to base plate and basement, then excavate the first foundation ditch 201 and the 3rd foundation ditch 203.Like this, during construction the second foundation ditch 202, distortion major effect protection building B3, B4 and the B6 of foundation ditch; While constructing the first foundation ditch 201, the distortion of foundation ditch only has influence on protection building B1 and B2; While constructing the 3rd foundation ditch 203, the distortion of foundation ditch only has influence on protection building B5.Finally, the first foundation ditch 201, the second foundation ditch 202 and the 3rd foundation ditch 203 are linked to be to integral body, complete construction.
Preferably, high or the strict foundation ditch of surrounding enviroment control deformation requirements to safe class, supporting adopts the pattern of going along with sb. to guard him that cement mixing interlocking pile and bored pile combine, and increase reinforced concrete inner support, be that design of its support rigidity suitably increases, and control the comparatively loose region of deformation requirements for environment, design of its support is suitably economical, to improve the economic benefit of deep big foundation pit engineering integral body.
The deep big foundation pit construction works of the present embodiment is by above-mentioned partitioned organization, the second darker foundation ditch 202 is dug in first construction, after backfill the second foundation ditch 202, construct the first foundation ditch 201 and the 3rd foundation ditch 203 can effectively be controlled the distortion of foundation ditch surrounding enviroment and reduce " tau-effect " of foundation ditch simultaneously again.Not only shield the impact of excavation of foundation pit on periphery historical protective buildings, also reduced the excavation area of foundation ditch simultaneously, guaranteed the safety of foundation ditch.
Foregoing description is only the description to the utility model preferred embodiment; the not any restriction to the utility model scope; any change, modification that the those of ordinary skill in the utility model field is done according to above-mentioned disclosure, all belong to the protection domain of claims.
Claims (2)
1. control the partitioned organization that deep big foundation pit is out of shape for one kind, it is characterized in that: described deep big foundation pit comprises the foundation ditch one being arranged in order, foundation ditch two and foundation ditch three, the described foundation ditch one and the foundation ditch three that are positioned at described deep big foundation pit both sides are non-conterminous, when the flat shape of described deep big foundation pit is sealene triangle, the plane of described foundation ditch two is elongated, one end of described foundation ditch two is positioned on the hypotenuse of described deep big foundation pit, the other end of described foundation ditch two is positioned on the long limit of described deep big foundation pit, the area of described foundation ditch one and described foundation ditch three is all greater than the area of described foundation ditch two, when the flat shape of described deep big foundation pit is elongated, the length of long sides of described deep big foundation pit is 250 meters～350 meters, and it is dark that the digging of described foundation ditch two is all greater than digging of described foundation ditch one and described foundation ditch three deeply.
2. partitioned organization according to claim 1, is characterized in that: the width of described foundation ditch two is more than or equal to 30 meters.
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| CN201320620508.2U CN203546727U (en) | 2013-10-09 | 2013-10-09 | Partition structure for controlling deformation of deep and large foundation pit |
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| CN201320620508.2U CN203546727U (en) | 2013-10-09 | 2013-10-09 | Partition structure for controlling deformation of deep and large foundation pit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106836230A (en) * | 2016-12-30 | 2017-06-13 | 上海建工七建集团有限公司 | A kind of foundation ditch point hole construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106836230A (en) * | 2016-12-30 | 2017-06-13 | 上海建工七建集团有限公司 | A kind of foundation ditch point hole construction method |
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Granted publication date: 20140416 |