CN109440763A - Bored pile construction method below existing building - Google Patents
Bored pile construction method below existing building Download PDFInfo
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- CN109440763A CN109440763A CN201811554284.3A CN201811554284A CN109440763A CN 109440763 A CN109440763 A CN 109440763A CN 201811554284 A CN201811554284 A CN 201811554284A CN 109440763 A CN109440763 A CN 109440763A
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- bored pile
- hole
- existing building
- pore
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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
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
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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)
- Piles And Underground Anchors (AREA)
Abstract
The present invention relates to a kind of bored pile construction methods below existing building, comprise the concrete steps that: firstly, carrying out bracing members reinforcing inside existing underground structure, avoiding position of opening；Before bored pile construction, using manually cut, aperture is to the lower part soil body on underground structure for the modes such as Spiral digging machine or full circle swinging machine, further according to the embedded conventional casing of level of ground water situation or long casing；When pore-forming, the simulated mud of use: specific gravity≤1.15g/cm3, PH=7~9, percentage of water loss≤30ml/30min, 1~3mm of mudcake.Construction method of the invention is able to achieve the cast-in-situ bored pile below existing building.It is able to achieve protection existing building and neighboring buildings, environmental protection and energy saving and improves comprehensive utilization rate of energy source, while being influenced to the use function in future arrangement with site operation bring is reduced.
Description
Technical field
The present invention relates to a kind of bored pile construction method, the cast-in-situ bored pile below especially a kind of existing building is applied
Work method.
Background technique
With the development that city is increasingly at full speed, phenomena such as there is old building renovation in city Central Plains or increases, is more and more, ground
Basis is the key position of building, if existing building increasing layer, enlarging etc. increase upper load, carries original foundation
Power cannot bear reconstruction, extend, load new after increasing layer, need to carry out consolidation process to existing foundation.Common pile foundation
Plinth reinforcement means is to be directly entered basement bottom structure aperture construction drill bored concrete pile, if underground structure headroom is small, drilling
Etc. equipment cannot be introduced into construction, then conventional cast-in-situ bored pile can not be implemented, generally use be construct again after cutting original structure it is new
Cast-in-situ bored pile finally rebuilds underground structure again.The construction method of cast-in-situ bored pile below existing building, i.e., do not destroy it is original
It constructs under the conditions of basement structure new cast-in-situ bored pile, taken into account strengthening of foundation and retains original underground structure, that is, shorten and apply
The work duration, also greatly reduce construction cost.
Summary of the invention
The present invention is to provide for a kind of existing building lower section bored pile construction method, which is able to achieve reservation
In the case where original structure, new basis of constructing.
To achieve the above object, the technical scheme is that the present invention relates to drill-pourings below a kind of existing building
Pile construction method comprises the concrete steps that: firstly, carrying out bracing members reinforcing in existing basement one local failure of structure position, boring
Hole pouring pile construction before, using manually cut, Spiral digging machine or full circle swinging machine mode remove existing basement one structure base slab, then root
According to the embedded conventional casing of level of ground water situation or long casing；When pore-forming, the simulated mud of use: specific gravity≤1.15g/cm3, PH=
7~9, percentage of water loss≤30ml/30min, 1~3mm of mudcake.
Further, guarantee with digging with surveying with entangling into hole perpendicularity 1/300 when the drilling pouring pile hole.
Further, when the drilling pouring pile hole, prospect hole is first carried out, every prospect hole detects four times, and detection includes aperture
Variation, hole termination depth, verticality and it is clear after bottom hole sediment thickness.
Further, obstacle under bottom plate and bottom plate to existing underground structure is also needed to carry out clearly before the bored pile construction
Remove, when removing obstacles, using manually remove obstacles, Spiral digging machine is removed obstacles or CD player is removed obstacles, meet construction site and removing obstacles for barrier depth wanted
It asks.
Further, before the bored pile construction, the existing water level conditions in place need to be monitored, meets authority file
For the construction requirement of cast-in-situ bored pile, it is unsatisfactory for guarantee quality of mud fluid when pore-forming using precipitation, pre- measures of preventing water.
Further, mud liquid level should keep stable in pore forming process mesoporous, and the absolute altitude of mud liquid level must be kept in stake holes
2 meters of level of ground water or more are higher by, and should all be higher by hole wall stable interface under any circumstance, it is extra or useless in mud circulation
The mud of abandoning should the processing of discharge in time.
Further, when pore-forming collapse hole, undergauge or drilled-hole inspecting discovery perpendicularity deviation, sediment thickness be more than set
When meter and code requirement are difficult to correct, using the cement earthen backfill stake holes for adding 6% cement, backfill is constructed again after completing 14 days
Cast-in-situ bored pile.
The beneficial effects of the present invention are: construction method of the invention is able to achieve protection existing building and neighboring buildings, environmental protection
Energy conservation and raising comprehensive utilization rate of energy source, while to the use function in future arrangement and reducing the influence of site operation bring.
Detailed description of the invention
Fig. 1 is existing underground structure relation schematic diagram；
Fig. 2 is that existing underground structure is removed obstacles schematic diagram；
Fig. 3 is the cast-in-situ bored pile sleeve schematic diagram below existing building.
Specific embodiment
With reference to the accompanying drawing with specific embodiment, the present invention is further explained.
Cast-in-situ bored pile is constructed on original underground structure top below existing building, is had to original underground structure deep
Solution, is analyzed in conjunction with actual field and drawing, and obstacle under bottom plate and bottom plate to existing underground structure is needed to carry out clearly before pore-forming
It removes, underground hydrological situation, existing building water level control is more demanding, has larger impact to later period hole quality, first should carry out ground
It is lauched to dash forward and gushes checking computations, the method cannot be used by being unsatisfactory for requirement.
Bored pile construction method below existing building of the invention, Specific construction step is: firstly, in original underground
2 existing basement one local failure of structure position of room carries out bracing members 3 and reinforces (Fig. 1,2), before the construction of cast-in-situ bored pile 1, adopts
Manually cut, the modes such as Spiral digging machine or full circle swinging machine remove existing basement one structure base slab (Fig. 2), further according to level of ground water
The embedded conventional 4 or high casing of casing (Fig. 3) of situation, conventional 4 length of casing should be greater than underground structure depth 50cm or more, such as underground
Water level is high, and when needing using the high casing for being higher by underground structure top, casing height should meet water level calculating；When pore-forming, use
Simulated mud: specific gravity≤1.15g/cm3, PH=7~9, percentage of water loss≤30ml/30min, 1~3mm of mudcake, level of ground water are high
When, mud balance, mudcake thickness etc. increase accordingly.
In addition it strengthens management, reasonable arrangement process shortens construction period, takes measures, meet design requirement (being shown in Table 1).
Table 1
The optimization of mud match ratio:
Since there are layers of sand, soil body lateral pressure is larger, collapses to prevent or reduce layer of sand, and liquid level absolute altitude is not low in control hole
The 0.3m below the absolute altitude of aperture safeguards the safety of lower part layer of sand to guarantee enough head pressures.From the physical mechanics of control mud
Index forms the premium mud that pit protection mud cake is thin and toughness is strong, it is ensured that Tu Bi in the process come when guaranteeing pore-forming, selection fluid loss is small
Stablize, the indices of mud are determined and controlled by theoretical calculation.
When determining pore-forming, mud is able to satisfy retaining wall requirement when reaching following index (shown in table 2).
Table 2
| Specific gravity | PH | Percentage of water loss | Mudcake |
| ≤1.15g/cm3 | 7~9 | ≤30ml/30min | 1~3mm |
The suitable equipment of removing obstacles of selection:
The case where according to existing building, the reasonable equipment of removing obstacles of selection prevent from impacting surrounding enviroment, or use
Pore-forming equipment that is smaller to soil disturbance and having ability of centainly removing obstacles.
It takes measures, meets requirement of removing obstacles:
(1) it is removed obstacles using CD player or Spiral digging machine to drilling region before pore-forming, to ensure that grooving quality can suitably increase
It removes obstacles range, larger diameter is selected to remove obstacles equipment.
(2) mud liquid level should keep stable in pore forming process mesoporous.The absolute altitude of mud liquid level must keep being higher by stake holes
2 meters of level of ground water or more, and should all be higher by hole wall stable interface under any circumstance.It is extra or discarded in mud circulation
Mud should the processing of discharge in time.
(3) it tries pore-forming every to detect four times (primary by each detection in 0,6,8,12 hour), examining report content includes aperture
Bottom hole sediment thickness after variation, hole termination depth, verticality and one are clear.Improve terminal bruss, butt joint repeatedly brush wall processing until
Without mud.
(4) pore-forming slurry coat method uses original soil pulping, uses artificial pulping instead if original soil pulping is not able to satisfy engine request.
(5) when concreting, strict control conduit spacing and buried depth depth, it is ensured that concrete pouring quality.
(6) concrete returns slurry height and properly increases, it is ensured that stake top concrete quality.
Emergency measure:
(1) emergency measure of hole wall landslide
Surpass if trying pore-forming and the large range of hole that collapses, undergauge or drilled-hole inspecting discovery perpendicularity deviation, sediment thickness occurring
Cross design and code requirement be difficult to correct, then can the comprehensive judgements such as same management, owner, design try pore-forming win or lose, if need
It constructs again after handling drilling backfill, and the concrete measure of backfill and processing.
(2) according to the cement earthen backfill stake holes for adding 6% cement in sundry item experience, can be used, backfill is completed 14 days
After can construction drill bored concrete pile again.
(3) if though examination pore-forming determines failure or does not fail but construction effect is not good enough, change pore-forming and borehole cleaning technique, adjustment
Mud index, or even it is replaced with hole equipment.
Claims (7)
1. a kind of bored pile construction method below existing building, which is characterized in that comprise the concrete steps that: firstly, existingly
Bracing members reinforcing is carried out inside flowering structure, avoids position of opening；Before bored pile construction, using manually cut, Spiral digging machine
Or the aperture on underground structure of full circle swinging machine mode is embedded further according to underground structure height and level of ground water situation to the lower part soil body
Conventional casing or high casing；When pore-forming, the simulated mud of use: specific gravity≤1.15g/cm3, PH=7~9, percentage of water loss≤30ml/
30min, 1~3mm of mudcake.
2. bored pile construction method below existing existing building according to claim 1, it is characterised in that: the brill
With digging with surveying with entangling when hole pouring pile pore-forming, guarantee into hole perpendicularity 1/300.
3. bored pile construction method below existing existing building according to claim 1, it is characterised in that: the brill
When hole pouring pile pore-forming, first carry out prospect hole, every prospect hole detects four times, detection include varying aperture, hole termination depth, verticality and
Bottom hole sediment thickness after clear.
4. bored pile construction method below existing building according to claim 1, it is characterised in that: the drilling fills
Obstacle under bottom plate and bottom plate to existing underground structure is also needed to be purged before note pile driving construction, when removing obstacles, using manually removing obstacles, revolve
Digging machine is removed obstacles or CD player is removed obstacles, and meets the requirement of removing obstacles of construction site and barrier depth.
5. bored pile construction method below existing building according to claim 1, it is characterised in that: the drilling fills
Before infusing pile driving construction, the existing water level conditions in place need to be monitored, meet authority file for the construction requirement of cast-in-situ bored pile,
It is unsatisfactory for guarantee quality of mud fluid when pore-forming using precipitation, pre- measures of preventing water.
6. bored pile construction method below existing building according to claim 1, it is characterised in that: in pore forming process
Mud liquid level should be kept stable in hole, and the absolute altitude of mud liquid level must keep being higher by 2 meters of level of ground water or more in stake holes, and in office
What should all be higher by hole wall stable interface in the case of, extra or discarded mud should the processing of discharge in time in mud circulation.
7. bored pile construction method below existing building according to claim 1, it is characterised in that: when pore-forming occurs
Collapse hole, undergauge or drilled-hole inspecting discovery perpendicularity deviation, sediment thickness is more than design and code requirement when being difficult to correct, and is adopted
With the cement earthen backfill stake holes for adding 6% cement, construction drill bored concrete pile again after backfill is completed 14 days.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811554284.3A CN109440763A (en) | 2018-12-19 | 2018-12-19 | Bored pile construction method below existing building |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811554284.3A CN109440763A (en) | 2018-12-19 | 2018-12-19 | Bored pile construction method below existing building |
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| CN109440763A true CN109440763A (en) | 2019-03-08 |
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| CN201811554284.3A Pending CN109440763A (en) | 2018-12-19 | 2018-12-19 | Bored pile construction method below existing building |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN113417307A (en) * | 2021-05-25 | 2021-09-21 | 上海建工一建集团有限公司 | Construction method for adding pile foundation after foundation pit excavation |
| CN114382076A (en) * | 2022-01-26 | 2022-04-22 | 上海市机械施工集团有限公司 | Bored pile construction method for existing underground structure |
| CN116240883A (en) * | 2023-02-21 | 2023-06-09 | 中铁二局集团有限公司 | Stirring pile construction method for penetrating existing underground reinforced concrete structure |
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2018
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| CN101787718A (en) * | 2010-02-10 | 2010-07-28 | 上海智平基础工程有限公司 | Casing construction method for reinforcing underground building and structure foundation |
| CN105274979A (en) * | 2015-10-12 | 2016-01-27 | 上海市基础工程集团有限公司 | Construction method for treating foundation of lower soil body through forming holes in existing structure |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN113417307A (en) * | 2021-05-25 | 2021-09-21 | 上海建工一建集团有限公司 | Construction method for adding pile foundation after foundation pit excavation |
| CN114382076A (en) * | 2022-01-26 | 2022-04-22 | 上海市机械施工集团有限公司 | Bored pile construction method for existing underground structure |
| CN116240883A (en) * | 2023-02-21 | 2023-06-09 | 中铁二局集团有限公司 | Stirring pile construction method for penetrating existing underground reinforced concrete structure |
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Application publication date: 20190308 |
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