CN203334294U - Combined foundation pit supporting structure - Google Patents

Combined foundation pit supporting structure Download PDF

Info

Publication number
CN203334294U
CN203334294U CN2013203311022U CN201320331102U CN203334294U CN 203334294 U CN203334294 U CN 203334294U CN 2013203311022 U CN2013203311022 U CN 2013203311022U CN 201320331102 U CN201320331102 U CN 201320331102U CN 203334294 U CN203334294 U CN 203334294U
Authority
CN
China
Prior art keywords
supporting
stake
slope
white
protection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN2013203311022U
Other languages
Chinese (zh)
Inventor
张锡治
何明华
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tianjin University Research Institute of Architectrual Design and Urban Planning
Original Assignee
Tianjin University Research Institute of Architectrual Design and Urban Planning
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tianjin University Research Institute of Architectrual Design and Urban Planning filed Critical Tianjin University Research Institute of Architectrual Design and Urban Planning
Priority to CN2013203311022U priority Critical patent/CN203334294U/en
Application granted granted Critical
Publication of CN203334294U publication Critical patent/CN203334294U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

The utility model discloses a combined foundation pit supporting structure which comprises a slope supporting structure body and a scattered row pile supporting structure body. The scattered row pile supporting structure body is constructed in the slope supporting structure body. Due to the fact that the scattered row pile supporting structure body is additionally disposed in the slope supporting structure body, stability of slop excavation is improved, the gradient of a slope to be excavated can be increased, and the occupied area of the slop is reduced. Meanwhile, the characteristic that slope excavation is simple and economical is in full use, so that the manufacturing cost of the whole supporting structure is less than that of a close row pipe supporting structure and that of a gravity retaining wall supporting structure.

Description

A kind of foundation ditch combined support structure
Technical field
The utility model relates to the Geotechnical Engineering field, particularly a kind of novel foundation ditch combined support structure.
Background technology
Putting the slope excavation is a kind of pattern foundation pit supporting structure mode of simple economy, and its application is subject to the restrictions such as project site, surrounding environment, ground soil property, cutting depth and groundwater table.In soft clay area, put the slope cutting depth and be generally less than 5m, in soil property, preferably in situation, maximum cutting depth can reach the 8m left and right.Under the condition allowed in place, darker deep foundation ditch often adopts multi level slope.The campshed supporting is the pattern foundation pit supporting structure important component part, in engineering, is used widely.Campshed is multiplex makes the campshed barricade in the base pit engineering of the dark 4~15m in hole, and concrete Guan Liang is built at top, it has, and rigidity is large, bending resistance is strong, the characteristics of distortion less, friction while simultaneously constructing, noise are little, without the soil compaction phenomenon, little to surrounding environment influence.When engineering pile also is castinplace pile, can synchronous construction, thus be conducive to construction organization.When excavation, affect in the degree of depth groundwater table high and while having the highly permeable layer, needs employing water proof measure or dewatering measure.When cutting depth is large or when strict to the side slope deformation requirements, need use in conjunction with anchor pull system or support system.
At present; usually there will be such problem in foundation pit supporting project practice:, cutting depth poor for soil property in the 5m left and right or soil property better, the darker foundation ditch of cutting depth; due to the restriction of being excavated the factors such as place, employing is simply put the slope supporting and often can not be met the requirement of Stability of Earth Slopes.And adopt the campshed supporting, although can solve the problem of supporting, bring larger engineering cost.
The utility model content
The utility model provides a kind of foundation ditch combined support structure that can reduce to excavate the horizontal movement of slight slope, the stability that improves the excavation slight slope, reduction construction costs for solving the technical problem existed in known technology.
The technical scheme that the utility model is taked for the technical problem existed in the solution known technology is: a kind of foundation ditch combined support structure, it is by putting slope supporting and protection structure and white-out stake supporting and protection structure forms, and described white-out stake supporting and protection structure is executed and built described putting in the supporting and protection structure of slope in.
The diameter that forms the white-out stake of described white-out stake supporting and protection structure is more than or equal to 300mm.
Forming the pile spacing of white-out stake of described white-out stake supporting and protection structure and the ratio of diameter is 2~7.
Described white-out stake is castinplace pile or preformed pile.
Described white-out stake supporting and protection structure is cantilevered supporting and protection structure.
The described angle of putting slope of putting slope supporting and protection structure is less than 90 °.
Described foundation ditch is the degree of depth soft soil foundation pit that is 3~5m or the degree of depth soil property that is 4~8m foundation ditch preferably.
Advantage and the good effect that the utlity model has are: add white-out stake supporting and protection structure in putting slope supporting and protection structure, can improve the stability of excavation slight slope, can increase the gradient of intending the excavation slight slope, reduce and put the place that slope takies, can utilize more fully the characteristics of putting slope excavation simple economy, make the cost of integer support structure lower than close pile supporting and protection structure and supporting structure for gravity type retaining wall simultaneously.
The accompanying drawing explanation
Fig. 1 is plan view of the present utility model;
Fig. 2 is the A-A sectional drawing of Fig. 1;
In Fig. 1 and Fig. 2: 1, white-out stake, 2, Po Ding, 3, the foundation ditch bottom, S, D are respectively spacing and the stake diameter of white-out stake, and h means the degree of depth of excavation of foundation pit;
Fig. 3 is the clay distribution schematic diagram of the utility model application example.
The specific embodiment
For further understanding summary of the invention of the present utility model, Characteristic, hereby exemplify following examples, and coordinate accompanying drawing to be described in detail as follows:
Refer to Fig. 1~Fig. 2, a kind of foundation ditch combined support structure, it is by putting slope supporting and protection structure and white-out stake supporting and protection structure forms, and described white-out stake supporting and protection structure is executed and is built described putting in the supporting and protection structure of slope in.The diameter that forms the white-out 1 of described white-out stake supporting and protection structure is more than or equal to 300mm.Forming the pile spacing of white-out stake 1 of described white-out stake supporting and protection structure and the ratio of diameter is 2~7.Described white-out stake 1 is castinplace pile or preformed pile.Described white-out stake supporting and protection structure is cantilevered supporting and protection structure.The described angle of putting slope of putting slope supporting and protection structure is less than 90 °.Described foundation ditch is the degree of depth soft soil foundation pit that is 3~5m or the degree of depth soil property that is 4~8m foundation ditch preferably.
Above-mentioned foundation ditch combined support structure is the white-out stake and the combination of putting slope, after Slope Stability Analysis, is intending excavation and form the certain position of slight slope, so that a determining deviation, stake footpath and stake are long, adds white-out stake 1.
The job practices of above-mentioned foundation ditch combined support structure comprises the following steps:
1) according to the excavation of foundation pit degree of depth and site condition, the preliminary gradient of determining excavation, and calculate the coefficient of stability that excavation forms slight slope;
2) the Stability of Earth Slopes coefficient improved as required, according to foundation condition, to ,Zhuan footpath, position, pile spacing and the design of a stake progress row of the white-out stake that adds;
3) construction white-out stake 1;
4) from top, slope 2, excavation pit;
5) foundation ditch bottom 3 is cleared up, flattened, and carried out next step construction working.
Combinations thereof supporting application foundation depth: be 3~5m in soft clay area; Soil property is 4~8m in situation preferably.
Refer to Fig. 3, take certain base pit engineering as example, illustrate white-out stake of the present utility model-put slope combined support structure.This project is positioned at Binhai New Area in Tianjin, and planning to build thing is 15 story frame structure, floor space 5100m 2, building area 24710m 2, whole place distribution individual layer underground garage, adopt pile foundation.The dark 3.8m of foundation ditch, the foundation ditch grade is three grades.Foundation soil vertical distribution from top to bottom is: 1. plain fill, thickness 1.0m; 2. clay, thickness 2.3m; 3. 1silt clay, thickness 3.2m; 3. 2mud, thickness 4.8m; 3. 3silt clay, thickness 5.7m.4. silty clay, thickness 5.0m.The size of excavation slight slope and clay distribution are as shown in Figure 3.
At first, determine the excavation gradient according to this foundation depth and site condition.This foundation depth is 3.8m, and underground is clay or the silt clay that intensity is lower, belongs to weak soil shallow foundation hole.Due to around built building is arranged, the excavation place limited.The gradient that can tentatively determine excavation is 1:1.5.The buckling safety factor that can excavate slight slope according to limit equilibrium state and finite element analysis is 1.154, does not meet the regulation and stipulation safety factor and is not less than 1.2 requirement.
Secondly, for guaranteeing to excavate the stability of slight slope, setting the Stability of Earth Slopes coefficient that need to improve is 0.2.Under this target, to position, spacing, stake footpath and the design of stake progress row that adds the white-out stake.Can adopt the Finite Element Method of considering pile-soil interaction to be optimized the discussion of design: 1) to change and establish a position, the slight slope that adds the white-out stake is carried out to the two-dimensional finite meta analysis, obtain the best and establish a position; 2) establish a position in the best, the stake footpath with certain, change the long and pilespacing of stake, carries out three-dimensional finite element analysis, obtains the Stability of Earth Slopes coefficient; 3) change a stake footpath, repeat 2) analysis; 4) get step 2), 3) in meet the scheme that given Soil Slope Stability requires, and long-pending along pile body under the vertical unit length of top, slope in more various scheme, get minimum scheme, 5) utilize finite element to obtain the stressed of this scheme white-out stake, carry out arrangement of reinforcement calculating.As calculated, the scheme that this excavation slight slope adds the white-out stake is: stake footpath 0.6m, stake long 14m, spacing 4m, be arranged on 1/5L place, slight slope middle and lower part, L is for excavating the horizontal range of slight slope, and constructional reinforcement is pressed in the white-out stake.
Then, following steps are taked in this project construction: 1) carry out the construction of pile foundation and white-out stake; 2) relevant monitoring point is set; 3) carry out artificial rainmaking, guarantee that groundwater table is lower than excavation face 0.5m left and right; 4) stage excavation slight slope, to designing the foundation ditch bottom; 5) carry out foundation construction and other work.
Although the above is described preferred embodiment of the present utility model by reference to the accompanying drawings; but the utility model is not limited to the above-mentioned specific embodiment; the above-mentioned specific embodiment is only schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present utility model; not breaking away from the scope situation that the utility model aim and claim protect, can also make a lot of forms, within these all belong to protection domain of the present utility model.

Claims (7)

1. a foundation ditch combined support structure is characterized in that: it is by putting slope supporting and protection structure and white-out stake supporting and protection structure forms, and described white-out stake supporting and protection structure is executed and built described putting in the supporting and protection structure of slope in.
2. foundation ditch combined support structure according to claim 1, it is characterized in that: the diameter that forms the white-out stake of described white-out stake supporting and protection structure is more than or equal to 300mm.
3. foundation ditch combined support structure according to claim 1 is characterized in that: forming the pile spacing of white-out stake of described white-out stake supporting and protection structure and the ratio of diameter is 2~7.
4. foundation ditch combined support structure according to claim 2, it is characterized in that: described white-out stake is castinplace pile or preformed pile.
5. foundation ditch combined support structure according to claim 1, it is characterized in that: described white-out stake supporting and protection structure is cantilevered supporting and protection structure.
6. foundation ditch combined support structure according to claim 1, it is characterized in that: the described angle of putting slope of putting slope supporting and protection structure is less than 90 °.
7. foundation ditch combined support structure according to claim 1 is characterized in that: described foundation ditch is the degree of depth soft soil foundation pit that is 3~5m or the degree of depth soil property that is 4~8m foundation ditch preferably.
CN2013203311022U 2013-06-07 2013-06-07 Combined foundation pit supporting structure Active CN203334294U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2013203311022U CN203334294U (en) 2013-06-07 2013-06-07 Combined foundation pit supporting structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2013203311022U CN203334294U (en) 2013-06-07 2013-06-07 Combined foundation pit supporting structure

Publications (1)

Publication Number Publication Date
CN203334294U true CN203334294U (en) 2013-12-11

Family

ID=49702975

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2013203311022U Active CN203334294U (en) 2013-06-07 2013-06-07 Combined foundation pit supporting structure

Country Status (1)

Country Link
CN (1) CN203334294U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105926639A (en) * 2016-06-28 2016-09-07 南华大学 Supporting system and monitoring method of foundation pit near city expressway
CN109137934A (en) * 2018-09-29 2019-01-04 浙江理工大学 Slope without inner support method for protecting support at the top of a kind of soft soil foundation pit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105926639A (en) * 2016-06-28 2016-09-07 南华大学 Supporting system and monitoring method of foundation pit near city expressway
CN109137934A (en) * 2018-09-29 2019-01-04 浙江理工大学 Slope without inner support method for protecting support at the top of a kind of soft soil foundation pit

Similar Documents

Publication Publication Date Title
CN104196034B (en) A kind of utilize steel sheet pile as the foundation ditch construction method in supporting cofferdam
CN104131546B (en) A kind of processing method of collapsible loess foundation
CN104404974B (en) The thick sand-pebble layer deep basal pit of high artesian slip casting back cover structure and construction technology thereof
CN103452121A (en) Long pile and short pile combined single-row pile and horizontal internal support pile supporting structure and construction method thereof
CN103924602B (en) Deep Thick Soft Ground foundation ditch construction method
CN104264688A (en) Manual hole digging non-uniform pile support construction technology
CN103510528A (en) Blind trench water discharging structure used for underground structure up-floating prevention
CN101413277B (en) Method for correcting incline of deep layer drill silt squeezing and soil discharging
CN103938634B (en) A kind of deep foundation pit supporting structure and construction method
CN103290850A (en) Arch combination foundation pit retaining and protection system and construction method thereof
CN203334294U (en) Combined foundation pit supporting structure
CN204780981U (en) Outdoor GIS equipment foundations of shallow formula of burying
CN202730785U (en) Anti-floating blind ditch water drainage structure for underground structure
CN204252148U (en) High artesian thick sand-pebble layer deep foundation ditch slip casting back cover structure
CN203716273U (en) Multifunctional ecological draining gutter
CN205399401U (en) Novel underground continuous wall of wallboard formula
CN103774639A (en) Preloading system and construction method
CN202610808U (en) Press-anchor-restrict method foundation pit retaining structure
CN102493485B (en) Method for building slope protection retaining wall during filling
CN203924106U (en) A kind of reinforced soil retaining wall is used from embedded dust block
CN210530860U (en) Deep-buried blocking barrier for controlling deformation of tunnel outside foundation pit
CN209816895U (en) Soft soil foundation structure for reducing post-construction settlement
CN209066468U (en) A kind of base pit dewatering device
CN203603162U (en) Construction elevator load basic system based on foundation pit edge
CN207211176U (en) A kind of big open caisson of superelevation

Legal Events

Date Code Title Description
GR01 Patent grant
C14 Grant of patent or utility model