CN203160254U - Pit support structure - Google Patents
Pit support structure Download PDFInfo
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- CN203160254U CN203160254U CN 201220602463 CN201220602463U CN203160254U CN 203160254 U CN203160254 U CN 203160254U CN 201220602463 CN201220602463 CN 201220602463 CN 201220602463 U CN201220602463 U CN 201220602463U CN 203160254 U CN203160254 U CN 203160254U
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- lining cutting
- sand
- foundation pit
- pit
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Abstract
The utility model relates to a pit support structure, which consists of an external enclosure structure and an internal lining, and is characterized in that the external enclosure structure is an annular cement-soil mixing pile enclosure wall; the internal lining is an annular reinforced concrete inner lining clung to the external annular cement-soil mixing pile enclosure wall; and the annular reinforced concrete inner lining is constructed through adopting the reverse building method in a support-free manner. The pit support structure mainly solves the problem that as the conventional cement-soil mixing pile support structure adopts the lining forward building method, namely the construction is performed from the bottom surface to the top when applied to a shallow pit and other enclosure manners, a plurality of inner supports are additionally arranged inside and are detached one by one after completion, huge manpower and material resources and capital are wasted, the pit support structure has the advantages of support-free construction, the capability of saving huge inner supports and support manufacture, and mounting load, simplicity in construction, and investment saving; and during the excavation, in virtue of the joint action of the external enclosure structure and the internal lining for timely construction, the thickness of the cement-soil mixing pile enclosure wall is greatly reduced, and the disturbance of the pit construction to the surrounding soil body is greatly reduced.
Description
Technical field
Engineering bracing of foundation pit technical field under the utility model possession relates to foundation pit enclosure structures such as push pipe working pit, reception hole, specifically a kind of foundation pit enclosure structure.
Background technology
As the push pipe working pit and receive the foundation ditch in hole, its space enclosing structure form is a lot, and the method that has is still among continuous development, each foundation pit enclosure structure have separately applicable elements and certain limitation.Contrary sequence method is exactly the emerging Base hole supporting technology that grew up in recent years.It is the effective ways of construction multilayer basement of high-rise building and other multilayer underground structures.As countries such as U.S., day, moral, methods, effect is preferably received in extensive use abroad.
At present, contrary sequence method has been issued and has been listed State Standard of the People's Republic of China's " Code for design of building " in (GB50007-2011); Various places have also been announced the basement top-down method construction successively, can illustrate that thus reverse construction reaches its maturity, its having very promising prospects in pattern foundation pit supporting structure.If eighties of last century is the contrary sequence method starting period, after and then developing rapidly in China and widely applying, nowadays it is in the technology maturation phase, will have the period of full bloom of great development.
Therefore in view of present domestic contrary sequence method all applies to large-scale deep foundation ditch field, the space enclosing structure that adopts is generally diaphragm wall or piling structure, and the interior wall of underground agent structure or plate-girder system are as the interior support of space enclosing structure and enclose the purlin system.But in municipal engineering especially push pipe working pit foundation ditch design field, the foundation ditch area is not under the situation of very big, inner no permanent plate-girder, often adopts bored pile, open caisson, SMW worker's method etc. along practice excavation technology, does not also introduce contrary sequence method technology.
Under the darker situation of circular foundation ditch, the little field of the area of plane, cutting depth, for the foundation pit enclosure structure of cement mixing method enclosure wall in conjunction with contrary sequence method, can overcome the cement mixing method enclosure wall and be suitable for the less restriction of foundation depth; Simultaneously, and compare along the practice, especially contrary sequence method after space enclosing structure (cement mixing method) construction finishes, the stage excavation foundation ditch, the laminated pouring inner lining structure can reduce the construction of support system, has good effect for reducing the construction period; In addition, because surface settlement and the horizontal movement of foundation ditch surrounding enviroment can be controlled and reduce to the stress performance of going along with sb. to guard him lined well-formed compared to caisson structure, well, minimizing has good social effect and environmental effect to the influence of adjacent line, building etc.
Summary of the invention
The purpose of this utility model is to provide a kind of foundation pit enclosure structure that cement mixing method adds contrary sequence method that is suitable for, and it can overcome the some shortcomings in the middle-size and small-size foundation ditch field.
To achieve these goals, technical solution of the present utility model is: a kind of foundation pit enclosure structure, and it is made up of outside space enclosing structure and inner lining cutting, it is characterized in that: described outside space enclosing structure is annular cement soil agitation pile enclosure wall; Inner lining cutting is the steel hoop inside concrete lining cutting of being close to the annular cement mixing method enclosure wall in outside.Described steel hoop inside concrete lining cutting is adopted contrary sequence method not have the construction of support and is formed, and described inner lining cutting is made up of the lining cutting section of multistage section construction, is provided with the constuction joint that the inboard is low, the outside is high between two sections adjacent lining cutting sections.Described constuction joint is 20
o～25
oTilt.This lining cutting bottom, inside is provided with sand mo(u)ld, and the sand mo(u)ld end face is provided with cement mortar, and the sand mo(u)ld surface is the inclined-plane that the inboard is low, the outside is high.The thickness of the cement mortar of described sand mo(u)ld end face is 25 ~ 35mm, and the inclination angle of inclined plane on described sand mo(u)ld surface is 20
o～25
o
The utility model mainly solve the foundation depth that existing cement mixing method space enclosing structure is suitable for more shallow, when all the other go along with sb. to guard him form liner along the practice, the i.e. upwards construction successively from the bottom surface, inside adds in the multiple tracks and supports, and needs after the completion to remove by the road, wastes a large amount of manpower and materials and financial resources.The utlity model has does not have the construction of support, support and support manufacturing, installation work in saving is a large amount of, and construction is simple, the saving investment; Simultaneously, in digging process, peripheral space enclosing structure and the inner lining structure acting in conjunction of construction in time can reduce the thickness of cement mixing method enclosure wall greatly, can reduce foundation pit construction again greatly to the disturbance of surrounding soil; Mainly be applicable to less planar dimension, than the circular base pit engineering of the heavy excavation degree of depth, in city municipal engineering construction, have favorable applicability and development prospect advantage of the present utility model: strengthened the applicability of cement mixing method enclosure wall to the degree of depth of different excavation of foundation pit; Do not have and support, save a large amount of interior support and peace and tear open, save investment; In digging process, peripheral space enclosing structure and the inner lining structure acting in conjunction of construction in time, reduce foundation pit construction to the disturbance of surrounding soil, minimizing is to the influence of environment, in city municipal engineering construction, has favorable applicability, be particularly useful for ambient influnence and have relatively high expectations, planar dimension is less, cutting depth is darker circular bracing of foundation pit and excavation.
Description of drawings
Fig. 1 is the structural representation of the utility model liner, template and sand mo(u)ld.
Fig. 2 is the structural representation of the utility model cement mixing method enclosure wall and inner lining cutting.
The specific embodiment
The utility model is described in further detail below in conjunction with Figure of description.
1 is the cement mixing method enclosure wall among the figure, and 2 is inner lining cutting, and 3 is sand mo(u)ld, and 4 is base plate, and 5 is the soil stabilization layer, and 6 is plain concrete cushion layer.
As shown in Figure 1, for the first time contrary inner lining cutting 2 bed dies of foundation ditch of doing are made high outside and low outside plagiohedral, and the bubble when making things convenient for the vibrating and vibrate of lower floor's lining cutting seam crossing overflows, and bed die adopts sand mo(u)ld 3, and builds C15 plain concrete cushion layer 6 at sand mo(u)ld.The high space of 500mm is reserved in the internal mold upper end below building lining concrete, outward-dipping certain angle when this pore belt side form is made, and exceed constuction joint 150 ~ 200mm.For making New-old concrete face contact closely knit, when concreting, make concrete surface a little more than constuction joint, after the form removal unnecessary concrete chisel removal.Treat for the first time contrary reach design strength as concrete after, begin excavation lining cutting for the second time, repeat the contrary operation of doing for the first time then.In order to improve bearing capacity of foundation soil, before the lining processing prerequisite, adopt cement mixing method to carry out consolidation process to the thick soil body of 4m below the base plate 4, form soil stabilization layer 5.
Job practices of the present utility model is:
1, the fixing and support of one-sided internal mold.The foundation ditch following 0.6m of absolute altitude at the bottom of the design per pass inner lining concrete that fetches earth; Medium coarse sand is selected in sand cushion construction for use, back-up sand absolute altitude at the bottom of the concreting in template, and end face lays out the inclined-plane, the constuction joint during as next concreting.Outside vertical reinforcement in the liner is inserted sand mo(u)ld 500mm, be used for the connection of downside vertical reinforcement and install.
2, every layer of bed die bracing reinforcement.Liner mainly adopts steel form, and seam application cement mortar is stifled tight between liner bottom template and the cement mixing method enclosure wall, in case spillage.The liner template supports and adopts steel pipe scaffold to the support supporting.
3, the concreting of reverse construction.The thickness of every layer of blanking and speed of perfusion control during concreting.Inner lining concrete adopts dump skip, the auxiliary blanking of tumbling barrel, and when building, concrete mixer is transported to concrete in the dump skip, is transported within the walls by tumbling barrel.
As shown in Figure 2, before excavation of foundation pit, cement mixing method enclosure wall 1, the soil stabilization layer at the end, hole 5 satisfy stipulates the length of time, requirement of strength.Before the soil excavation, the monitoring unit needs according to observation points such as the good bracing of foundation pit sedimentation of monitoring scheme cloth, displacement, ground settlement and building settlements, and at the good original value of construction before measurement.To note protection to each monitoring point, prevent in digging process destroyed.After cast-in-place steel hoop inside concrete lining cutting 2 reaches the design strength requirement, could excavate and support the following earthwork.
Carry out drainage plant before the excavation, do not soak to guarantee excavation back excavation face, the foundation ditch periphery prevents that well the surface water from flowing into the safeguard measure in the foundation ditch; Established safety barrier around the foundation ditch; The weight preloading meets the design conditions requirement around the foundation ditch, does not allow to surpass 20kPa.Excavation of foundation pit is based on the machinery shoveling, repaiies manually that to dig be auxilliary, cuts the earth at the end, finishing hole the base plate 4 of constructing as early as possible then with artificial when approaching hole end 300mm.
The utility model is the outer peripheral protection structure owing to having adopted annular cement soil agitation pile enclosure wall, adopt the steel hoop concrete to do inner lining cutting, and inner lining cutting is for being close to annular cement soil agitation pile enclosure wall, thereby, can adopt contrary sequence method not have the construction of support, i.e. section construction from top to bottom, need not to arrange interior support, make inner lining cutting and annular cement soil agitation pile enclosure wall form an integral body and stressed jointly, be similar to " bucket " structure, also can reduce the thickness of peripheral cement mixing method enclosure wall greatly.The utility model is owing to arrange sand mo(u)ld in inner lining cutting bottom, and this sand mo(u)ld end face is 30mm solid cement mortar, the sand mo(u)ld upper surface make inboard low, the outside is high is 20
o～25
oThe constuction joint that tilts, thereby the vibrating and deaeration of seam crossing when the inclination constuction joint is convenient to lower floor's lining cutting is beneficial to concrete substantial toe of wall space; Simultaneously, because skin is the cement mixing method enclosure wall of certain thickness, mutual overlap joint, therefore, there is not the requirement of waterproof in inner lining cutting seam crossing, need not to arrange antiprimings such as steel plate for sealing water or hydro-expansive rubber bar.The involved construction technologies such as cement mixing method of the utility model are all comparatively ripe, are not repeated at this.
Claims (6)
1. foundation pit enclosure structure, it is made up of outside space enclosing structure and inner lining cutting, it is characterized in that: outside space enclosing structure is annular cement soil agitation pile enclosure wall; Inner lining cutting is the steel hoop inside concrete lining cutting of being close to annular cement soil agitation pile enclosure wall, and described steel hoop inside concrete lining cutting is adopted contrary sequence method not have the construction of support and formed.
2. a kind of foundation pit enclosure structure according to claim 1 is characterized in that: and described inner lining cutting is made up of the inside lining cutting section of multistage section construction.
3. a kind of foundation pit enclosure structure according to claim 2 is characterized in that: be provided with the constuction joint that the inboard is low, the outside is high between two sections adjacent lining cutting sections.
4. a kind of foundation pit enclosure structure according to claim 3, it is characterized in that: constuction joint is 20
o～25
oTilt.
5. a kind of foundation pit enclosure structure according to claim 3, it is characterized in that: the bottom of described inner lining cutting arranges sand mo(u)ld, outside vertical reinforcement inserts sand mo(u)ld 500mm in the inner lining cutting, and this sand mo(u)ld end face is provided with cement mortar, and the inclined-plane that the inboard is low, the outside is high is arranged at the sand mo(u)ld top.
6. foundation pit enclosure structure according to claim 5, it is characterized in that: the thickness of the cement mortar of described sand mo(u)ld end face is 25 ~ 35mm, the inclination angle of inclined plane on described sand mo(u)ld surface is 20
o～25
o
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220602463 CN203160254U (en) | 2012-11-15 | 2012-11-15 | Pit support structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220602463 CN203160254U (en) | 2012-11-15 | 2012-11-15 | Pit support structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203160254U true CN203160254U (en) | 2013-08-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220602463 Expired - Fee Related CN203160254U (en) | 2012-11-15 | 2012-11-15 | Pit support structure |
Country Status (1)
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|---|---|
| CN (1) | CN203160254U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103669367A (en) * | 2013-11-26 | 2014-03-26 | 上海城建市政工程（集团）有限公司 | Method for forecast evaluation of peripheral disturbance influence of foundation pit excavation |
| CN105507345A (en) * | 2015-12-04 | 2016-04-20 | 嘉库智能停车***（上海）有限公司 | Reversed construction method for well type fully-automatic three-dimensional garage |
| CN108149922A (en) * | 2017-12-29 | 2018-06-12 | 上海市机械施工集团有限公司 | It is a kind of suitable for reverse construction structure roof without row's template construction method |
| CN109306712A (en) * | 2018-04-20 | 2019-02-05 | 中建四局第六建筑工程有限公司 | Upper pipe working well is inverse to build construction |
| CN113882387A (en) * | 2021-09-01 | 2022-01-04 | 武汉市政工程设计研究院有限责任公司 | Large-diameter circular ultra-deep foundation pit reverse construction structure without inner support and construction method |
-
2012
- 2012-11-15 CN CN 201220602463 patent/CN203160254U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103669367A (en) * | 2013-11-26 | 2014-03-26 | 上海城建市政工程（集团）有限公司 | Method for forecast evaluation of peripheral disturbance influence of foundation pit excavation |
| CN103669367B (en) * | 2013-11-26 | 2016-04-06 | 上海城建市政工程（集团）有限公司 | A kind of method for forecast evaluation of peripheral disturbance influence of foundation pit excavation |
| CN105507345A (en) * | 2015-12-04 | 2016-04-20 | 嘉库智能停车***（上海）有限公司 | Reversed construction method for well type fully-automatic three-dimensional garage |
| CN108149922A (en) * | 2017-12-29 | 2018-06-12 | 上海市机械施工集团有限公司 | It is a kind of suitable for reverse construction structure roof without row's template construction method |
| CN109306712A (en) * | 2018-04-20 | 2019-02-05 | 中建四局第六建筑工程有限公司 | Upper pipe working well is inverse to build construction |
| CN113882387A (en) * | 2021-09-01 | 2022-01-04 | 武汉市政工程设计研究院有限责任公司 | Large-diameter circular ultra-deep foundation pit reverse construction structure without inner support and construction method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130828 Termination date: 20211115 |