CN113417307A - Construction method for adding pile foundation after foundation pit excavation - Google Patents
Construction method for adding pile foundation after foundation pit excavation Download PDFInfo
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- CN113417307A CN113417307A CN202110568047.8A CN202110568047A CN113417307A CN 113417307 A CN113417307 A CN 113417307A CN 202110568047 A CN202110568047 A CN 202110568047A CN 113417307 A CN113417307 A CN 113417307A
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- casing
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- 238000010276 construction Methods 0.000 title claims abstract description 57
- 238000009412 basement excavation Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 230000008569 process Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009435 building construction Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/66—Mould-pipes or other moulds
- E02D5/665—Mould-pipes or other moulds for making piles
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Foundations (AREA)
Abstract
The invention relates to a construction method for adding a pile foundation after foundation pit excavation, which comprises the following steps: step 1: determining the position of a newly added pile foundation according to the design requirement and the relative position relation between the newly added pile foundation and a constructed engineering pile or a stand column pile and an existing main body structure or support; step 2: constructing a foundation pit to a raft according to a construction scheme, reserving a corresponding pile casing for the newly-added pile foundation before the construction of the raft according to the position of the newly-added pile foundation, and arranging a cover plate on the pile casing after the construction of the raft; and step 3: building the main body structure according to the construction scheme, and reserving corresponding holes above the positions of the newly added pile foundations before the construction of each layer of the main body structure; and 4, step 4: after the main structure is built again and the first floor structure meets the design strength requirement, the cover plate of the pile casing is taken down, the pile casing is lengthened to the first floor slab of the main structure, and the pile foundation is newly constructed on the first floor slab of the main structure by utilizing the pile driving equipment. The pile foundation is increased smoothly by presetting the casing, and the construction safety is high.
Description
Technical Field
The invention relates to the field of building construction, in particular to a construction method for adding a pile foundation after foundation pit excavation.
Background
The pile foundation construction is generally performed before excavation of a foundation pit, however, in the foundation pit construction process, the situation that the pile foundation (namely, pile repair) needs to be added due to design change is often encountered. Before the foundation pit is not excavated, pile supplementing construction is carried out according to a conventional construction method, but after the foundation pit earthwork construction, construction of adding a pile foundation is difficult. Firstly, the construction of a pile foundation is difficult to stop after earthwork construction, and the shutdown deformation of a foundation pit is difficult to control; secondly, the pile foundation is constructed in the foundation pit, the site is narrow, temporary supporting components are possible, various devices and machines cannot be spread, and the use of the devices and machines is influenced; and finally, constructing the pile foundation in the foundation pit, wherein the risk coefficient is high, and unknown safety risk is easily induced. Therefore, it is an urgent technical problem to be solved by those skilled in the art to provide a construction method for increasing pile foundations after excavation of a foundation pit, which can ensure smooth increase of pile foundations and construction safety.
Disclosure of Invention
The invention provides a construction method for adding a pile foundation after foundation pit excavation, which aims to solve the technical problem.
In order to solve the technical problem, the invention provides a construction method for increasing a pile foundation after excavation of a foundation pit, which comprises the following steps:
step 1: determining the position of a newly-added pile foundation according to the design requirement and the relative position relation between the newly-added pile foundation and a constructed engineering pile or a stand column pile and an existing main body structure or support;
step 2: constructing a foundation pit to a raft according to a construction scheme, reserving a corresponding pile casing for the newly-added pile foundation before the construction of the raft according to the position of the newly-added pile foundation, and arranging a cover plate on the pile casing after the construction of the raft;
and step 3: building a main body structure according to the construction scheme, and reserving a corresponding hole above the position of the newly added pile foundation before the construction of each layer of the main body structure;
and 4, step 4: when the major structure is built again, and after the first floor structure reaches the design strength requirement, take off the apron of casing, lengthen the casing extremely on the first floor slab of major structure, utilize pile equipment to be in the major structure be under construction on the first floor slab newly-increased pile foundation.
Preferably, the protective cylinder is made of cylindrical steel.
Preferably, the cross-sectional area of the casing is related to the size of the newly added pile foundation.
Preferably, the diameter of the casing is 100mm +/-10 mm larger than that of the newly-added pile foundation.
Preferably, the cross-sectional area of the hole is related to the size of the casing.
Preferably, the edge of the hole extends outwards by 100mm +/-10 mm relative to the edge of the casing.
Preferably, the casing is installed in a segmented mode.
Preferably, the cover plate is made of a steel plate, and the steel plate completely covers the top of the casing.
Compared with the prior art, the construction method for adding the pile foundation after the foundation pit is excavated, provided by the invention, has the following advantages:
1. according to the invention, the corresponding pile casings are reserved before the raft construction, so that the required pile foundations can be smoothly supplemented in the later period on the premise of not influencing the construction period.
2. Need not to be under construction the pile foundation in narrow and small foundation ditch, be convenient for construct and the work progress factor of safety height.
Drawings
Fig. 1 is a schematic plan view of the position of a newly added pile foundation according to an embodiment of the present invention;
FIG. 2 is a schematic elevational view of a pre-reserved casing according to an embodiment of the present invention;
FIG. 3 is a schematic plan view of a casing according to an embodiment of the present invention;
FIG. 4 is a schematic elevation view of a main structure according to an embodiment of the present invention;
fig. 5 is a schematic elevation view illustrating construction of a newly added pile foundation according to an embodiment of the present invention.
In the figure: 01-engineering pile or upright pile, 02-existing main body structure or support, 03-soil layer, 04-raft plate, 05-main body structure; 10-newly-added pile foundation, 20-pile casing, 30-cover plate, 40-opening and 50-piling equipment.
Detailed Description
In order to more thoroughly express the technical scheme of the invention, the following specific examples are listed to demonstrate the technical effect; it is emphasized that these examples are intended to illustrate the invention and are not to be construed as limiting the scope of the invention.
The construction method for adding the pile foundation after excavation of the foundation pit, disclosed by the invention, comprises the following steps as shown in figures 1 to 5:
step 1: referring to fig. 1, the position of the newly added pile foundation 10 is determined according to design requirements (e.g., design change of the newly added pile foundation) and a relative position relationship between the newly added pile foundation 10 and the already constructed engineering pile or the column pile 01 and the existing main structure or the support 02, specifically, if the position of the newly added pile foundation 10 collides with the positions of the engineering pile or the column pile 01 and the existing main structure or the support 02, the position of the newly added pile foundation 10 needs to be moved by design until the newly added pile foundation 10 does not collide with the already constructed engineering pile or the column pile 01 and the existing main structure or the support 02, and the construction requirements of the newly added pile foundation 10 can be met.
Step 2: please refer to fig. 2 and fig. 3, a foundation pit is constructed to a raft 04 according to a construction scheme, a corresponding casing 20 is reserved for the newly-added pile foundation 10 before the raft 04 is constructed according to the position of the newly-added pile foundation 10, that is, the casing 20 is installed in a soil layer 03, in this embodiment, the casing 20 is a cylindrical steel casing, the cross-sectional area of the casing 20 is related to the size of the newly-added pile foundation 10, for example, the diameter of the casing 20 may be 100mm ± 10mm larger than the diameter of the newly-added pile foundation 10; then, constructing a raft 04 on the soil layer 03, and enabling the pile casing 20 to penetrate through the raft 04; then, after the raft 04 is constructed, arranging a cover plate 30 on the pile casing 20, wherein the cover plate 30 is used for preventing garbage and the like from falling into the pile casing 20 in the process of building the main body structure 05 back, and influencing the construction of the subsequent newly-added pile foundation 10; preferably, the cover plate 30 is made of a steel plate, and the steel plate completely covers the top of the casing 20, so as to ensure the protection effect.
And step 3: referring to fig. 4, the main structure 05 is built according to the construction scheme, and a corresponding hole 40 is reserved above the position of the newly added pile foundation 10 before each layer of the main structure 05 is constructed. Specifically, the cross-sectional area of the hole 40 is related to the size of the casing 20, and in this embodiment, the edge of the hole 40 extends outwards by 100mm ± 10mm relative to the edge of the casing 20.
And 4, step 4: please refer to fig. 5, when the main structure 05 is built again and the first floor reaches the design strength requirement, the cover plate 30 of the casing 20 is removed, the casing 20 is lengthened to the first floor of the main structure 05, and the pile driver 50 is used to construct the new pile foundation 10 on the first floor of the main structure 05, of course, the first floor of the main structure 05 should meet the construction load requirement of the pile driver 50, otherwise, the reinforcement should be taken until the requirement is met. In the invention, the construction process of the newly added pile foundation 10 has little influence on the construction process of the whole project, and the construction safety factor is high.
Preferably, in the process of lengthening the casing 20, the casing 20 can be installed in sections, the height of the casing 20 is increased section by section, and potential safety hazards caused by overhigh casing 20 and no support of the main body structure 05 are avoided.
In summary, the construction method for adding the pile foundation after excavation of the foundation pit provided by the invention comprises the following steps:
step 1: determining the position of the newly added pile foundation 10 according to the design requirements and the relative position relationship between the newly added pile foundation and the constructed engineering pile or upright pile 01 and the existing main structure or support 02; step 2: constructing a foundation pit to a raft 04 according to a construction scheme, reserving a corresponding pile casing 20 for the newly-added pile foundation 10 before the construction of the raft 04 according to the position of the newly-added pile foundation 10, and arranging a cover plate 30 on the pile casing 20 after the construction of the raft 04; and step 3: building a main body structure 05 according to the construction scheme, and reserving a corresponding hole 40 above the position of the newly added pile foundation 10 before constructing each layer of the main body structure 05; and 4, step 4: when the major structure 05 is built again, and after the first floor structure reaches the design strength requirement, take off the apron 30 of the casing 20, lengthen the casing 20 to on the first floor slab of major structure 05, utilize pile equipment 50 to be in the major structure 05 be under construction on the first floor slab newly-increased pile foundation 10. According to the invention, the corresponding pile casing 20 is reserved before the raft 04 is constructed, so that the required pile foundation can be smoothly supplemented in the later period on the premise of not influencing the construction period; need not to be under construction the pile foundation in narrow and small foundation ditch, be convenient for construct and the work progress factor of safety height.
It will be apparent to those skilled in the art that various changes and modifications may be made in the invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A construction method for increasing pile foundations after foundation pit excavation is characterized by comprising the following steps:
step 1: determining the position of a newly-added pile foundation according to the design requirement and the relative position relation between the newly-added pile foundation and a constructed engineering pile or a stand column pile and an existing main body structure or support;
step 2: constructing a foundation pit to a raft according to a construction scheme, reserving a corresponding pile casing for the newly-added pile foundation before the construction of the raft according to the position of the newly-added pile foundation, and arranging a cover plate on the pile casing after the construction of the raft;
and step 3: building a main body structure according to the construction scheme, and reserving a corresponding hole above the position of the newly added pile foundation before the construction of each layer of the main body structure;
and 4, step 4: when the major structure is built again, and after the first floor structure reaches the design strength requirement, take off the apron of casing, lengthen the casing extremely on the first floor slab of major structure, utilize pile equipment to be in the major structure be under construction on the first floor slab newly-increased pile foundation.
2. The method for increasing the pile foundation after excavation of the foundation pit as claimed in claim 1, wherein the pile casing is a cylindrical steel casing.
3. The method of claim 2, wherein the cross-sectional area of the casing is related to the size of the new pile foundation.
4. The method for constructing an additionally arranged pile foundation after excavation of a foundation pit according to claim 3, wherein the diameter of the casing is 100mm +/-10 mm larger than that of the additionally arranged pile foundation.
5. The method of claim 2 or 4, wherein the cross-sectional area of the opening is related to the size of the casing.
6. The method of claim 5, wherein the edge of the opening extends 100mm +/-10 mm outwards relative to the edge of the casing.
7. The method for increasing the pile foundation after excavation of the foundation pit as claimed in claim 2, wherein the casing is installed in sections.
8. The method for increasing the pile foundation after excavation of the foundation pit as claimed in claim 1, wherein the cover plate is a steel plate, and the steel plate completely covers the top of the casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110568047.8A CN113417307A (en) | 2021-05-25 | 2021-05-25 | Construction method for adding pile foundation after foundation pit excavation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110568047.8A CN113417307A (en) | 2021-05-25 | 2021-05-25 | Construction method for adding pile foundation after foundation pit excavation |
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| Publication Number | Publication Date |
|---|---|
| CN113417307A true CN113417307A (en) | 2021-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110568047.8A Pending CN113417307A (en) | 2021-05-25 | 2021-05-25 | Construction method for adding pile foundation after foundation pit excavation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114182721A (en) * | 2021-12-22 | 2022-03-15 | 新疆路桥建设集团有限公司 | Construction method for bearing casing bored pile and pouring pile of raft at collapsible loess section |
Citations (5)
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|---|---|---|---|---|
| JP2005325603A (en) * | 2004-05-14 | 2005-11-24 | Taisei Corp | Construction method of foundation in inverted construction method and support structure of concrete foundation |
| CN102644274A (en) * | 2012-04-17 | 2012-08-22 | 中铁隧道集团三处有限公司 | Pile-forming construction method for penetrating through existing structure by fender post |
| CN109440763A (en) * | 2018-12-19 | 2019-03-08 | 上海市基础工程集团有限公司 | Bored pile construction method below existing building |
| CN110924428A (en) * | 2019-11-08 | 2020-03-27 | 中天建设集团有限公司 | Pile-forming construction method for cast-in-place pile to penetrate existing basement structure |
| CN111119227A (en) * | 2019-12-18 | 2020-05-08 | 上海市建工设计研究总院有限公司 | Basement foundation reconstruction construction method and structure thereof |
-
2021
- 2021-05-25 CN CN202110568047.8A patent/CN113417307A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005325603A (en) * | 2004-05-14 | 2005-11-24 | Taisei Corp | Construction method of foundation in inverted construction method and support structure of concrete foundation |
| CN102644274A (en) * | 2012-04-17 | 2012-08-22 | 中铁隧道集团三处有限公司 | Pile-forming construction method for penetrating through existing structure by fender post |
| CN109440763A (en) * | 2018-12-19 | 2019-03-08 | 上海市基础工程集团有限公司 | Bored pile construction method below existing building |
| CN110924428A (en) * | 2019-11-08 | 2020-03-27 | 中天建设集团有限公司 | Pile-forming construction method for cast-in-place pile to penetrate existing basement structure |
| CN111119227A (en) * | 2019-12-18 | 2020-05-08 | 上海市建工设计研究总院有限公司 | Basement foundation reconstruction construction method and structure thereof |
Non-Patent Citations (2)
| Title |
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| 张克纯等: "PHC管桩桩基偏位事故的分析和处理", 《施工技术》 * |
| 张克纯等: "PHC管桩桩基偏位事故的分析和处理", 《施工技术》, no. 01, 18 January 2007 (2007-01-18), pages 79 - 80 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114182721A (en) * | 2021-12-22 | 2022-03-15 | 新疆路桥建设集团有限公司 | Construction method for bearing casing bored pile and pouring pile of raft at collapsible loess section |
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Application publication date: 20210921 |
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