CN105696602A - Composite pile-anchor supporting method and structure for deepening excavation - Google Patents
Composite pile-anchor supporting method and structure for deepening excavation Download PDFInfo
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- CN105696602A CN105696602A CN201610151809.3A CN201610151809A CN105696602A CN 105696602 A CN105696602 A CN 105696602A CN 201610151809 A CN201610151809 A CN 201610151809A CN 105696602 A CN105696602 A CN 105696602A
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- support
- waist rail
- pile
- support pile
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
Abstract
The invention relates to a foundation pit supporting method for deepening excavation. When secondary deepening excavation is conducted on an excavated foundation pit, on the basis of an original foundation pit supporting system, a new supporting system, which comprises supporting piles II and new top beams II, is arranged at the bottom of the excavated foundation pit, and the original foundation pit supporting system is tightly connected with the new supporting system by virtue of new waist beams II and new connecting beams so as to form a composite supporting system. When the deepening excavation is required on a constructed foundation pit supporting project, the original supporting system cannot provide enough resistance, and the original foundation pit supporting system and the new supporting system are connected by virtue of the new waist beams II and the new connecting beams, so as to form the integrated composite supporting system. In the composite supporting system, the original supporting structure is utilized sufficiently; on the basis of ensuring the safety and the stability of the foundation pit, the purposes of facilitating the construction and shortening the construction period are achieved; and the scheme ensures the continuous construction during the subsequent excavation stage of the foundation pit project.
Description
Technical field
The present invention relates to a kind of foundation pit supporting construction its support reinforcement method and structure, be particularly suited for large area relatively deep basal pit and deepen excavation supporting。
Background technology
Along with socioeconomic high speed development, the anxiety of urban land promotes buildings or structures constantly to extend to the underground space, accelerate the exploitation of urban underground space, cause that city excavation of foundation pit scale develops towards bigger deeper direction, the period that Jin20Nian Shi China Development of Urban Foundation Work is the swiftest and the most violent, for the situation that urban area land used is nervous and land price is expensive, developer always manages to improve the space utilization benefit in soil。Stretch upwards the restriction being subject to plot ratio, thus strengthen the utilization to the underground space and then become effective selection。The design theory of foundation pit supporting construction is proposed new requirement with construction technology by this。In such a situa-tion, create and the foundation ditch excavated is carried out secondary add the demand of deep excavation。Existing supporting construction can not meet new force request, it is necessary to former support system is taked suitable reinforcement and strengthening measure, to reaching safely, effectively, rational purpose。
Summary of the invention
Problem to be solved by this invention is to provide a kind of deepens excavation pit method for protecting support and structure, and this malformation is little, take full advantage of original support system, easy construction, economy are good。
The technical solution of the present invention is: add compound piled anchor method for protecting support under deep excavation, when the foundation ditch excavated being carried out secondary and adding deep excavation, on original foundation pit supporting system basis, the newly-increased support system including newly-increased support pile and newly-increased stake apical cap beam composition is being set at the bottom of the Foundation Pit excavated again and by including increase waist rail two and linking beam by former foundation pit supporting system and the closely coupled formation composite support system of newly-increased support system。
Described original support system comprises former hat beam one and former support pile one, and former hat beam one is longitudinally connected with former support pile one top, arranges anchor pole one between former support pile one, by waist rail one, with anchor pole one, former support pile one is connected as overall structure。
Waist rail two is connected with support pile one pile body in longitudinal direction, is connected with linking beam in the horizontal。
Waist rail two is connected with former support pile one, and newly-increased stake apical cap beam two and newly-increased waist rail two are connected as a single entity by linking beam。
Anchor pole two is set between newly-increased support pile stake, by stake apical cap beam two, newly-increased support pile two is linked as overall structure with anchor pole two。
Present invention also offers one and add composite supporting construction under deep excavation, including the original support system being arranged in foundation ditch and with newly-increased support system；Original support system includes putting the campshed one being made up of some support piles one in foundation ditch surrounding medial wall and stake apical cap beam one, and stake apical cap beam one is connected with support pile one top and is connected as a single entity by some support piles one；Newly-increased support system includes the campshed two being made up of some support piles two and the stake apical cap beam two that are arranged in the region that some support piles one surround, stake apical cap beam two is connected with support pile two top and is connected as a single entity by some support piles two, lower than at the bottom of the stake of support pile one at the bottom of the stake of support pile two, waist rail two it is provided with between campshed one and campshed two, described waist rail two is connected with campshed one, being provided with linking beam between campshed two and waist rail two, the stake apical cap beam two of campshed two and waist rail two are connected by linking beam。
Being connected to waist rail one on described campshed one, be provided with the anchor pole one being connected with waist rail one between adjacent support pile one, support pile one is linked as entirety with anchor pole one by waist rail one。
Being provided with between described adjacent support pile two and be preced with the anchor pole two that beam two is connected, support pile and anchor pole two are linked as entirety by being preced with beam two。
The main muscle of described waist rail two adopts postinstalled chemically rebar mode to anchor in support pile one pile body, links beam main tendon and extends to anchor and come of age Liang Erzhong into waist rail two, new and old support system is connected as entirety, wherein the requirement of anchorage length of steel bar compliant。
The invention has the beneficial effects as follows: under the premise ensureing deep pit monitor, adopt suitable its support reinforcement structural design, it is ensured that new and old support system is combination stressed rationally, easy construction, duration are saved, economical rationality。
Accompanying drawing explanation
Fig. 1 is the profile of the present invention；
Fig. 2 is the waist rail two junction point drawing of the present invention；
Fig. 3 is the linking beam full-page proof profile of the present invention；
Fig. 4 is the linking beam full-page proof plane graph of the present invention；
Fig. 5 is the general lay-out of the present invention。
Detailed description of the invention
Referring to Fig. 1 ~ 5, the present invention when carrying out secondary and adding deep excavation to the foundation ditch excavated, on original foundation pit supporting system 1 basis, the newly-increased support system 4 including newly-increased support pile and newly-increased Guan Liang composition is being set at the bottom of the Foundation Pit excavated again and by including newly-increased waist rail 2 and newly-increased linking beam 3 by former foundation pit supporting system and the closely coupled formation composite support system of newly-increased support system。
Former foundation pit supporting system 1 includes being arranged on the some support piles 1.2 inside foundation ditch surrounding and stake apical cap beam 1.1, support pile 1.2 stretches into an apical cap beam 1.1, and some support piles 1.2 are connected as a single entity, the row of piles being made up of support pile 4.2 and stake apical cap beam 4.1 are set in the region that support pile 1.2 surrounds, support pile 4.1 stretches in an apical cap beam 4.2, support pile 4.2 is connected as a single entity, lower than at the bottom of the stake of support pile 1.2 at the bottom of the stake of support pile 4.2, it is provided with waist rail 2 between support pile 1.2 and 4.2, described waist rail 2 is connected with support pile 1.2, it is provided with linking beam 3 between support pile stake apical cap beam 4.1 and waist rail 2。
Being prestressed anchor 1.3,4.3 between described support pile 1.2,4.2, prestressed anchor is connected with stake apical cap beam 4.1 by waist rail 1.4, and wherein waist rail 2 is fixed on support pile pile body side in foundation ditch。
Original support system can adopt Row Piles Supporting Structure, newly-increased support system that campshed or Diaphragm Wall Support Structure, newly-increased waist rail can be adopted can to adopt reinforced beam, and newly-increased linking beam can adopt reinforced beam。Wherein, linking beam " one jumps one " interval arranges or arranges by stake, makes supporting construction new, old form overall force structure。
The main muscle 5.1 of waist rail 2 adopts postinstalled chemically rebar mode to anchor in support pile 1.2 pile body, and main muscle 5.2 extension of linking beam 2 anchors waist rail 2 and comes of age in beam 4.2, new and old support system is connected as entirety, wherein the requirement of anchorage length of steel bar compliant。
There is distribution within the scope of highly permeable layer and rich groundwater or excavation of foundation pit soil layer to have weak soil when foundation ditch area distribution, between the new and old support pile of the present invention (former support pile 1.2 and newly-increased support pile 4.2), cement mixing pile or high-pressure rotary jet grouting pile also can be set, it is also possible to combine soil stabilization in hole。
The enforcement step of the present invention is: the first newly-increased support pile 4.2 of construction inside the existing support system 1 of foundation ditch surrounding, and then in foundation ditch, layer and section excavates and construct between original stake anchor pole 4.3 between anchor pole 1.3 and newly-increased stake；Until excavation increases waist rail 2, newly-increased linking beam 3 and newly-increased hat beam 4.1 absolute altitude newly to predetermined, construction corresponding construction, meets layer and section excavation after requirement until structural strength, carries out newly-increased anchor pole 4.3 and constructs, it is excavated to design hole end absolute altitude, builds bed course and carry out main structure construction。Newly-increased support pile 4.2 can double as main structural engineering stake。
The invention have the advantages that
(1) inside foundation ditch, set up new support system, construct foundation ditch surrounding enviroment are less。
(2) one entirety of composite support System forming, and strengthen at node place, new and old support system boundary, reasonable stress, easy construction, duration are saved。
Claims (9)
1. add compound piled anchor method for protecting support under deep excavation, it is characterized in that: when the foundation ditch excavated being carried out secondary and adding deep excavation, on original foundation pit supporting system basis, the newly-increased support system including support pile two and newly-increased stake apical cap beam two composition is being set at the bottom of the Foundation Pit excavated again and by including increase waist rail two and linking beam by former foundation pit supporting system and the closely coupled formation composite support system of newly-increased support system。
2. add compound piled anchor method for protecting support under deep excavation as claimed in claim 1, it is characterized in that: described original support system comprises former hat beam one and former support pile one, former hat beam one is longitudinally connected with former support pile one top, between former support pile one, anchor pole one is set, by waist rail one, former support pile one is connected as overall structure with anchor pole one。
3. add compound piled anchor method for protecting support under deep excavation as claimed in claim 1, it is characterised in that: waist rail two is connected with support pile one pile body in longitudinal direction, is connected with linking beam in the horizontal。
4. add compound piled anchor method for protecting support under deep excavation as claimed in claim 2, it is characterised in that: waist rail two is connected with support pile one, and newly-increased stake apical cap beam two and waist rail two are connected as a single entity by linking beam。
5. add compound piled anchor method for protecting support under deep excavation as claimed in claim 1, it is characterised in that: anchor pole two is set between newly-increased support pile two, by stake apical cap beam two, support pile two and anchor pole two is linked as overall structure。
6. add composite supporting construction under deep excavation, it is characterised in that: original support system of including being arranged in foundation ditch and with newly-increased support system；Original support system includes the campshed one being made up of some support piles one and the stake apical cap beam one that are arranged on foundation ditch surrounding medial wall, and stake apical cap beam one is connected with support pile one top and is connected as a single entity by some support piles one；Newly-increased support system includes the campshed two being made up of some support piles two and the stake apical cap beam two that are arranged in the region that some support piles one surround, stake apical cap beam two is connected with support pile two top and is connected as a single entity by some support piles two, lower than at the bottom of the stake of support pile one at the bottom of the stake of support pile two, waist rail two it is provided with between campshed one and campshed two, described waist rail two is connected with campshed one, being provided with linking beam between campshed two and waist rail two, the stake apical cap beam two of campshed two and waist rail two are connected by linking beam。
7. add composite supporting construction under deep excavation as claimed in claim 6, it is characterised in that: being connected to waist rail one on described campshed one, be provided with the anchor pole one being connected with waist rail one between adjacent support pile one, support pile one is linked as entirety with anchor pole one by waist rail one。
8. add composite supporting construction under deep excavation as claimed in claim 6, it is characterised in that: being provided with between described adjacent support pile two and be preced with the anchor pole two that beam two is connected, support pile two and anchor pole two are linked as entirety by being preced with beam two。
9. as described in right 6, add composite supporting construction under deep excavation, it is characterised in that the main muscle of waist rail two adopts postinstalled chemically rebar mode to anchor in support pile one pile body, link beam main tendon and extend to anchor and come of age Liang Erzhong into waist rail two。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610151809.3A CN105696602A (en) | 2016-03-17 | 2016-03-17 | Composite pile-anchor supporting method and structure for deepening excavation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610151809.3A CN105696602A (en) | 2016-03-17 | 2016-03-17 | Composite pile-anchor supporting method and structure for deepening excavation |
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| CN105696602A true CN105696602A (en) | 2016-06-22 |
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| CN201610151809.3A Pending CN105696602A (en) | 2016-03-17 | 2016-03-17 | Composite pile-anchor supporting method and structure for deepening excavation |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106638618A (en) * | 2016-12-20 | 2017-05-10 | 杭州江润科技有限公司 | Construction method of reinforced concrete support structure of diaphgram wall retaining foundation pit |
| CN108487256A (en) * | 2018-03-07 | 2018-09-04 | 中冶集团武汉勘察研究院有限公司 | A kind of ruggedized construction and method that foundation pit deepened is backbreak |
| CN109736324A (en) * | 2019-01-11 | 2019-05-10 | 河北中地志诚土木工程有限公司 | A kind of construction method of the miniature piled anchor prop of ladder |
| CN110747861A (en) * | 2019-10-30 | 2020-02-04 | 中国建筑第四工程局有限公司 | High-water-level deep foundation pit excavation construction method |
| CN113026765A (en) * | 2021-03-31 | 2021-06-25 | 河南省远基岩土工程有限公司 | Existing support body's reinforcement support body |
| CN113106981A (en) * | 2021-03-31 | 2021-07-13 | 河南省远基岩土工程有限公司 | Foundation pit deepening reinforcement support body |
| CN113235613A (en) * | 2021-05-24 | 2021-08-10 | 中国铁路设计集团有限公司 | Newly-built foundation pit excavation supporting method using adjacent existing fender post |
| CN113668553A (en) * | 2021-08-05 | 2021-11-19 | 深圳宏业基岩土科技股份有限公司 | Composite supporting structure of foundation pit adjacent to building |
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| CN203256751U (en) * | 2013-05-22 | 2013-10-30 | 中国建筑第八工程局有限公司 | Deep foundation pit supporting structure for soft soil foundation |
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| CN205475257U (en) * | 2016-03-17 | 2016-08-17 | 中南勘察设计院（湖北）有限责任公司 | A composite pile anchor supporting construction for deepening excavation |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106638618A (en) * | 2016-12-20 | 2017-05-10 | 杭州江润科技有限公司 | Construction method of reinforced concrete support structure of diaphgram wall retaining foundation pit |
| CN106638618B (en) * | 2016-12-20 | 2018-10-23 | 杭州江润科技有限公司 | Ground-connecting-wall goes along with sb. to guard him the construction method of foundation pit reinforced concrete support construction |
| CN108487256A (en) * | 2018-03-07 | 2018-09-04 | 中冶集团武汉勘察研究院有限公司 | A kind of ruggedized construction and method that foundation pit deepened is backbreak |
| CN109736324A (en) * | 2019-01-11 | 2019-05-10 | 河北中地志诚土木工程有限公司 | A kind of construction method of the miniature piled anchor prop of ladder |
| CN110747861A (en) * | 2019-10-30 | 2020-02-04 | 中国建筑第四工程局有限公司 | High-water-level deep foundation pit excavation construction method |
| CN113026765A (en) * | 2021-03-31 | 2021-06-25 | 河南省远基岩土工程有限公司 | Existing support body's reinforcement support body |
| CN113106981A (en) * | 2021-03-31 | 2021-07-13 | 河南省远基岩土工程有限公司 | Foundation pit deepening reinforcement support body |
| CN113235613A (en) * | 2021-05-24 | 2021-08-10 | 中国铁路设计集团有限公司 | Newly-built foundation pit excavation supporting method using adjacent existing fender post |
| CN113668553A (en) * | 2021-08-05 | 2021-11-19 | 深圳宏业基岩土科技股份有限公司 | Composite supporting structure of foundation pit adjacent to building |
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Application publication date: 20160622 |
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