CN102644294A - Foundation underpinning method around foundation pit - Google Patents
Foundation underpinning method around foundation pit Download PDFInfo
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- CN102644294A CN102644294A CN2012101030043A CN201210103004A CN102644294A CN 102644294 A CN102644294 A CN 102644294A CN 2012101030043 A CN2012101030043 A CN 2012101030043A CN 201210103004 A CN201210103004 A CN 201210103004A CN 102644294 A CN102644294 A CN 102644294A
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Abstract
The invention discloses a foundation underpinning method around a foundation pit. The method comprises the following steps of: 1) selecting the place for excavating a foundation pit, and arranging a row of cast-in-situ bored piles on the two opposite sides of the building foundation close to the foundation pit side respectively; 2) excavating the soil close to the foundation pit side till the foundation bottom, and planting bars on the two opposite sides of the building foundation; 3) binding the pile cap beam steel bar, and enabling the planted bars to extend into the pile cap beam so that the cast-in-situ bored piles are connected with the building foundation; 4) pouring the pile cap beam, enabling the building foundation to penetrate through the pile cap beam to form a reinforced concrete structure with the cast-in-situ bored piles on the two opposite sides, wherein the side section of the structure has an 'n' shape; and 5) excavating the foundation pit. By using the method in the invention, a foundation protection support and expansion system is built, the side load of the original building foundation is underpinned to the pile bodies on the two sides, and the differential settlement and overturning collapse caused by excavating the shallow-foundation building can be avoided. The method disclosed by the invention can be applied to the excavation operation of a foundation pit with relatively shallow building foundations on adjacent sides.
Description
Technical field
The foundation ditch periphery foundation underpinning method that the present invention relates to use in a kind of building engineering construction.
Background technology
Because building operations place surrounding enviroment are complicated; The foundation ditch periphery often has the building of building on the shallow foundation; If so excavation pit and do not do the protection measure rashly; Just behind foundation pit dewatering or soil excavation, cause the foundation uneven settlement of this building easily, even toppling and collapse, directly influencing construction safety.The method that solves at present all be to adopt the foundation ditch limit to install supporting additional usually, yet this is not very effective.If can be to other supporter (for example dark stake), even shallow foundation then also can hold and can stand because the side sedimentation that excavation of foundation pit brings with the foundation underpinning of said building.But not seeing at present has this class methods.
Summary of the invention
The object of the invention is to provide a kind of foundation underpinning method that excavation of foundation pit causes the building foundation differential settlement even topples that is used to solve.
The solution that the present invention solves its technical problem is:
A kind of method of foundation ditch periphery foundation underpinning may further comprise the steps:
1), selected place of preparing excavation pit, and, a gang drill hole pouring pile is set respectively on two opposite side near the building foundation on foundation ditch limit;
2), excavation is near the extremely basic end of foundation ditch limit soil, bar planting on two opposite side of described building foundation;
3), bar planting is accomplished and firm after, colligation pile cover beam steel, bar planting is stretched in the pile cover beam, and pile cover beam steel and bar planting are fused bored pile and building foundation;
4), build the pile cover beam, let the building foundation pass through the pile cover beam, form reinforced concrete structure with the bored pile at two opposite side places, the side section of this structure is " Jiong " shape;
5), excavation pit.
As the further improvement of technique scheme, the bored pile in the said step 1) is to be provided with like this:
1a), confirm stake plan view, a setting stake hole well absolute altitude;
1b), Installation and Debugging stake machine;
1c), bury casing underground;
1d), build mud pit;
1e), drilling construction;
1f), clear hole;
1g), lay reinforcing cage;
1h), with tremie method to carrying out concreting in the hole, firm until pile body, intensity reaches requirement.
As the further improvement of technique scheme, the bar planting in the said step 3) is accomplished and is firm, is meant after the bar planting action is accomplished, and has spent 2 hours at least.
The invention has the beneficial effects as follows: the present invention utilizes bored pile in a row extension as underground foundation; Be connected with the building foundation with the pile cover beam; Form a base and protect an expansion system; With the side load of original building foundation, underpin on the pile body on both sides, can avoid effectively like this because excavation of foundation pit causes the shallow foundation unequal settlement of building, topples and collapse.The present invention is skillfully constructed, and step is simple, implements easily, can be applicable in the more shallow excavation of foundation pit operation in adjacent side building foundation.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention, the accompanying drawing of required use is done simple declaration in will describing embodiment below.Obviously, described accompanying drawing is a part of embodiment of the present invention, rather than whole embodiment, and those skilled in the art can also obtain other design schemes and accompanying drawing according to these accompanying drawings under the prerequisite of not paying creative work.
Fig. 1 is a structural representation of the present invention.
The specific embodiment
Below will combine embodiment and accompanying drawing that the technique effect of design of the present invention, concrete structure and generation is carried out clear, complete description, to understand the object of the invention, characteristic and effect fully.Obviously; Described embodiment is a part of embodiment of the present invention, rather than whole embodiment, based on embodiments of the invention; Other embodiment that those skilled in the art is obtained under the prerequisite of not paying creative work all belong to the scope that the present invention protects.In addition, all connection/annexations of being mentioned in the literary composition are not to refer to that singly member directly joins, and are meant and can connect auxiliary through adding or reducing according to the practical implementation situation, form more excellent draw bail.
With reference to Fig. 1, a kind of method of foundation ditch periphery foundation underpinning may further comprise the steps:
1), selected place of preparing excavation pit, and, a gang drill hole pouring pile 2 is set respectively on two opposite side near the building foundation 1 on foundation ditch limit;
2), excavation is near the extremely basic end of foundation ditch limit soil, bar planting on two opposite side of described building foundation 1, i.e. connecting reinforcement among Fig. 13;
3), bar planting is accomplished and firm after, colligation pile cover beam steel, bar planting is stretched in the pile cover beam 4, and pile cover beam steel and bar planting are fused bored pile 2 and building foundation 1;
4), build pile cover beam 4, let building foundation 1 through pile cover beam 4, form reinforced concrete structure with the bored pile 1 at two opposite side places, the side section of this structure is " Jiong " shape;
5), excavation pit.
Certainly, the soil excavation of foundation ditch should be treated just to carry out after the concrete strength of newly building reaches designing requirement.The arranging rule of above-mentioned bored pile can be according to the actual adjustment of field condition.Particularly, the castinplace pile pile body should closely be arranged.
Further as preferred embodiment, the bored pile 2 in the said step 1) is to be provided with like this:
1a), confirm stake plan view, a setting stake hole well absolute altitude;
1b), Installation and Debugging stake machine;
1c), bury casing underground;
1d), build mud pit;
1e), drilling construction;
1f), clear hole;
1g), lay reinforcing cage;
1h), with tremie method to carrying out concreting in the hole, firm until pile body, intensity reaches requirement.
Further as preferred embodiment, the bar planting in the said step 3) is accomplished and is firm, is meant after the bar planting action is accomplished, and has spent 2 hours at least.That is to say that colligation pile cover beam steel is after bar planting 2 hours, this is in order to let reinforcing bar grasping concrete fully, to form firm reinforced concrete structure.
More than be that preferred embodiments of the present invention is specified; But the invention is not limited to said embodiment; Those of ordinary skill in the art also can make all equivalent modifications or replacement under the prerequisite of spirit of the present invention, modification that these are equal to or replacement all are included in the application's claim institute restricted portion.
Claims (3)
1. the method for foundation ditch periphery foundation underpinning is characterized in that: may further comprise the steps:
1), selected place of preparing excavation pit, and, a gang drill hole pouring pile is set respectively on two opposite side near the building foundation on foundation ditch limit;
2), excavation is near the extremely basic end of foundation ditch limit soil, bar planting on two opposite side of described building foundation;
3), bar planting is accomplished and firm after, colligation pile cover beam steel, bar planting is stretched in the pile cover beam, and pile cover beam steel and bar planting are fused bored pile and building foundation;
4), build the pile cover beam, let the building foundation pass through the pile cover beam, form reinforced concrete structure with the bored pile at two opposite side places, the side section of this structure is " Jiong " shape;
5), excavation pit.
2. the method for foundation ditch periphery foundation underpinning according to claim 1 is characterized in that: the bored pile in the said step 1) is to be provided with like this:
1a), confirm stake plan view, a setting stake hole well absolute altitude;
1b), Installation and Debugging stake machine;
1c), bury casing underground;
1d), build mud pit;
1e), drilling construction;
1f), clear hole;
1g), lay reinforcing cage;
1h), with tremie method to carrying out concreting in the hole, firm until pile body, intensity reaches requirement.
3. the method for foundation ditch periphery foundation underpinning according to claim 1 is characterized in that: the bar planting in the said step 3) is accomplished and is firm, is meant after the bar planting action is accomplished, and has spent 2 hours at least.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101030043A CN102644294A (en) | 2012-04-10 | 2012-04-10 | Foundation underpinning method around foundation pit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101030043A CN102644294A (en) | 2012-04-10 | 2012-04-10 | Foundation underpinning method around foundation pit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102644294A true CN102644294A (en) | 2012-08-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101030043A Pending CN102644294A (en) | 2012-04-10 | 2012-04-10 | Foundation underpinning method around foundation pit |
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| CN (1) | CN102644294A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108755732A (en) * | 2018-08-01 | 2018-11-06 | 山东省元丰节能装备科技股份有限公司 | Energy conservation and environmental protection storage equipment ring foundation and its construction method |
| CN110670615A (en) * | 2019-09-24 | 2020-01-10 | 天津大学 | Subway green construction adjustment method based on limited space |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006328716A (en) * | 2005-05-24 | 2006-12-07 | Shimizu Corp | Structure and method for underpinning of existing structure and method of constructing new structure near existing structure |
| CN201128916Y (en) * | 2007-07-13 | 2008-10-08 | 铁道第二勘察设计院 | Active pile foundation underpinning structure |
| CN101806040A (en) * | 2010-03-25 | 2010-08-18 | 徐国彬 | Underpinning device and method for bridge and building |
-
2012
- 2012-04-10 CN CN2012101030043A patent/CN102644294A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006328716A (en) * | 2005-05-24 | 2006-12-07 | Shimizu Corp | Structure and method for underpinning of existing structure and method of constructing new structure near existing structure |
| CN201128916Y (en) * | 2007-07-13 | 2008-10-08 | 铁道第二勘察设计院 | Active pile foundation underpinning structure |
| CN101806040A (en) * | 2010-03-25 | 2010-08-18 | 徐国彬 | Underpinning device and method for bridge and building |
Non-Patent Citations (2)
| Title |
|---|
| 李粮纲等: "《基础工程施工技术》", 1 May 2001, 中国地质大学出版社 * |
| 王世君: "桩基托换技术在广州地铁三号线工程中的应用", 《施工技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108755732A (en) * | 2018-08-01 | 2018-11-06 | 山东省元丰节能装备科技股份有限公司 | Energy conservation and environmental protection storage equipment ring foundation and its construction method |
| CN110670615A (en) * | 2019-09-24 | 2020-01-10 | 天津大学 | Subway green construction adjustment method based on limited space |
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Application publication date: 20120822 |