CN110820726A - Pile foundation pore-forming method in environment where disturbance is not suitable for surrounding of hard rock in mountainous area - Google Patents
Pile foundation pore-forming method in environment where disturbance is not suitable for surrounding of hard rock in mountainous area Download PDFInfo
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- CN110820726A CN110820726A CN201911127799.XA CN201911127799A CN110820726A CN 110820726 A CN110820726 A CN 110820726A CN 201911127799 A CN201911127799 A CN 201911127799A CN 110820726 A CN110820726 A CN 110820726A
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
- F42D1/08—Tamping methods; Methods for loading boreholes with explosives; Apparatus therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
- F42D3/04—Particular applications of blasting techniques for rock blasting
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention provides a pile foundation pore-forming method in a mountainous hard rock surrounding environment which is not easy to disturb, which is suitable for the conditions that a mountainous rock layer is hard and is close to a living area or the surrounding environment is not easy to disturb, and can improve the pile foundation pore-forming efficiency on the premise of ensuring safety.
Description
Technical Field
The invention relates to the technical field of hard rock pile foundation pore-forming, in particular to a pile foundation pore-forming method in a hard rock periphery unfavorable disturbance environment in a mountainous area.
Background
At present, blasting pore-forming and water grinding drilling pore-forming construction processes are preferentially selected in the construction of hard rock pile foundations in mountainous areas. The water mill drill construction process has the advantages of regular forming, simple equipment, easiness in operation, no need of blasting, small interference, high safety and the like, but the construction period is long. The blasting hole forming has the advantage of faster pile forming, but the blasting hole forming has high danger and is not suitable for being adopted when the blasting hole forming is close to a building or objects which are not suitable for being disturbed exist at the periphery of the building. Therefore, how to accelerate the hole forming of the pile foundation and reduce the danger in the environment that the periphery of hard rock in the mountainous area is not easy to disturb becomes the difficulty of the hole forming of the pile foundation.
Disclosure of Invention
The invention provides a pile foundation pore-forming method in a mountainous hard rock surrounding environment which is not easy to disturb, which is suitable for the conditions that a mountainous rock layer is hard and is close to a living area or the surrounding environment is not easy to disturb, and can improve the pile foundation pore-forming efficiency on the premise of ensuring safety.
In order to achieve the technical features, the invention is realized as follows: a pile foundation pore-forming method in a mountainous hard rock surrounding environment which is not suitable for disturbance is characterized by comprising the following steps:
firstly, excavating a pile hole, and drilling a circle of core drilling holes on the inner edge of a pile foundation;
taking out the rock cores in all the drill core holes, and further forming a central column in the centers of all the drill core holes so as to form a free face with the surrounding rock wall;
step three, uniformly drilling a plurality of drilling and blasting holes in the center and the periphery of the center column;
fourthly, filling explosives into the drilled blasting holes;
fifthly, detonating and deslagging the central column to form a primary pile hole;
and step six, repeatedly circulating the step one to the step six until the height is 20-50 cm from the bottom of the pile foundation hole, and excavating by using manpower and a pneumatic pick to ensure the integrity of the bed rock at the bottom of the pile.
The diameter of the initial pile foundation selected in the step one is larger than that of the pile foundation to be molded finally, the edges of the drill core holes are arranged in an overlapped mode, and a central column formed in the drill core holes is guaranteed.
And in the third step, the depth of the drilling and blasting hole is less than that of the core drilling hole.
And in the fourth step, explosive loading is controlled according to small explosive loosening blasting, and specific explosive loading is controlled according to the pile diameter of the central column and rock stratum strength.
And fifthly, adopting a small-dose loose blasting method for blasting.
The drilling and blasting holes are distributed in a cross shape.
And in the step one, core drilling is carried out by adopting a water grinding drill.
The invention has the following beneficial effects:
the method is suitable for the hole forming method which is suitable for the conditions that the rock stratum in the mountainous area is hard and is close to a living area or the periphery is not easy to disturb, can improve the hole forming efficiency of the pile foundation on the premise of ensuring safety, and fully utilizes the advantages of regular forming, small interference and high safety of the water mill drilling construction process and the characteristic of quick blasting hole forming. Combine together the two advantage, adopt the water mill to bore during the construction, take out cylindric core along pile foundation aperture inward flange in proper order for the pile foundation is waited to dig out rock mass part and rock wall around and is formed new face the sky face, waits to face the sky face and bores the back of getting, drills, powder charge to facing the core in the sky face, adopts little dose not hard up blasting construction process to get the rock, thereby reaches the purpose that improves pile foundation pore-forming efficiency. The advantages of the water mill drilling method and the shallow hole loosening blasting method are organically combined, and the method has the advantages of regular water mill drilling forming, small interference and high safety, and also has the advantage of rapid hole forming by the blasting method.
Drawings
The invention is further illustrated by the following figures and examples.
FIG. 1 is a plan view of the arrangement of core holes in step one of the present invention.
FIG. 2 is a cross-sectional view of the A-A core hole arrangement of FIG. 1 of the present invention.
Fig. 3 is a plan view of the arrangement of the blast holes drilled in the third step of the invention.
Fig. 4 is a cross-sectional view of the B-B drill-and-blast arrangement of fig. 3 of the present invention.
Fig. 5 is a plan view of the present invention after initiation of the center post in step five.
Fig. 6 is a cross-sectional view of the C-C center post of fig. 5 after initiation of the present invention.
Fig. 7 is a plan view of the arrangement of the secondary core hole drilling construction in step six of the present invention.
Fig. 8 is a cross-sectional view D-D of fig. 7 of the present invention.
In the figure: drilling a core hole 1, a pile foundation 2, a drilling and blasting hole 3, a central column 4 and a preliminary pile hole 5.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
Example 1:
referring to fig. 1-8, a pile foundation pore-forming method in an environment where the periphery of hard rock in a mountainous area is not suitable for disturbance is characterized by comprising the following steps:
firstly, excavating a pile hole, and drilling a circle of core drilling holes 1 on the inner edge of a pile foundation 2;
taking out the cores in all the drill core holes 1, and further forming a central column 4 in the centers of all the drill core holes 1 to form a blank surface with the surrounding rock wall;
step three, uniformly drilling a plurality of drilling and blasting holes 3 in the center and the periphery of the central column 4;
fourthly, filling explosives into the drilling and blasting holes 3;
fifthly, detonating and deslagging the central column 4 to form a primary pile hole 5;
and step six, repeatedly circulating the step one to the step six until the height is 20-50 cm from the bottom of the pile foundation hole, and excavating by using manual work and a pneumatic pick to ensure the integrity of the foundation rock at the bottom of the pile.
The diameter of the initial pile foundation 2 selected in the first step is larger than that of the pile foundation to be formed finally, the edges of the drill core holes 1 are arranged in an overlapping mode, and a central column 4 formed in the drill core holes is guaranteed.
And in the third step, the depth of the drilling and blasting hole 3 is less than that of the core drilling hole 1.
And in the fourth step, explosive loading is controlled according to small explosive loosening blasting, and specific explosive loading is controlled according to the pile diameter of the central column 4 and rock stratum strength.
And fifthly, adopting a small-dose loose blasting method for blasting.
The drilling and blasting holes 3 are distributed in a cross shape.
And in the step one, the core drilling hole 1 is drilled by a water mill drill.
Example 2:
by adopting the pore-forming method, also called a water mill isolation blasting method, each pile hole can be provided with a drilling machine according to the size of the pile diameter, and a circle of small holes are drilled at the inner edge of the pile diameter, wherein the hole depth is 60cm, and the hole diameter is 16 cm; after the core is drilled and taken out, the intermediate rock body and the peripheral rock wall form a face empty surface, the intermediate rock body is drilled and blasted, 3-6 blast holes are distributed in a cross shape according to the hardness of the rock and the size of the pile diameter, 5 holes are distributed in a cross shape by taking a pile foundation with the diameter of 1.5m as an example, the distribution distance between the holes is controlled according to 40cm, and the depth is controlled according to 60 cm; and (3) charging in the blast hole of the intermediate rock mass, controlling the charging amount according to small-dosage loose blasting, controlling the specific charging amount according to the pile diameter and the rock stratum strength, detonating and deslagging, and carrying out repeated circulation until the height is 20-50 cm from the bottom of the hole, and then excavating by using manpower and a pneumatic pick to ensure the integrity of the foundation rock at the bottom of the pile.
Compared with the blasting construction molding rule, the water-mill isolation blasting method has the advantages that the interference to surrounding rock masses is smaller, the safety risk is high, and the method can be adopted when the method is close to a building or objects which are not suitable for disturbance exist on the periphery; compared with the traditional water grinding drill construction process, the water grinding isolation blasting method construction process optimizes the traditional water grinding drill construction process and has the advantage of high pile forming speed.
Claims (7)
1. A pile foundation pore-forming method in a mountainous hard rock surrounding environment which is not suitable for disturbance is characterized by comprising the following steps:
firstly, excavating a pile hole, and drilling a circle of core drilling holes (1) on the inner edge of a pile foundation (2);
taking out the cores in all the drill core holes (1), and further forming a central column (4) in the centers of all the drill core holes (1) to form a blank surface with the surrounding rock wall;
step three, uniformly drilling a plurality of drilling and blasting holes (3) in the center of the central column (4) and the periphery of the central column;
fourthly, filling explosives into the drilling and blasting hole (3);
fifthly, detonating and deslagging the central column (4) to form a primary pile hole (5);
and step six, repeatedly circulating the step one to the step six until the height is 20-50 cm from the bottom of the pile foundation hole, and excavating by using manpower and a pneumatic pick to ensure the integrity of the bed rock at the bottom of the pile.
2. The method for forming the hole in the pile foundation in the environment where the periphery of the hard rock in the mountainous area is not suitable for disturbance according to claim 1, wherein the method comprises the following steps: the diameter of the initial pile foundation (2) selected in the step one is larger than that of the pile foundation which needs to be formed finally, the edges of the drill core holes (1) are arranged in an overlapping mode, and a central column (4) formed in the drill core holes is guaranteed.
3. The method for forming the hole in the pile foundation in the environment where the periphery of the hard rock in the mountainous area is not suitable for disturbance according to claim 1, wherein the method comprises the following steps: in the third step, the depth of the drilling and blasting hole (3) is smaller than that of the core drilling hole (1).
4. The method for forming the hole in the pile foundation in the environment where the periphery of the hard rock in the mountainous area is not suitable for disturbance according to claim 1, wherein the method comprises the following steps: and in the fourth step, explosive loading is controlled according to small explosive loosening blasting, and specific explosive loading is controlled according to the pile diameter of the central column (4) and rock stratum strength.
5. The method for forming the hole in the pile foundation in the environment where the periphery of the hard rock in the mountainous area is not suitable for disturbance according to claim 1, wherein the method comprises the following steps: and fifthly, adopting a small-dose loose blasting method for blasting.
6. The method for forming the hole in the pile foundation in the environment where the periphery of the hard rock in the mountainous area is not suitable for disturbance according to claim 1, wherein the method comprises the following steps: the drilling and blasting holes (3) are distributed in a cross shape.
7. The method for forming the hole in the pile foundation in the environment where the periphery of the hard rock in the mountainous area is not suitable for disturbance according to claim 1, wherein the method comprises the following steps: and in the step one, the core drilling hole (1) is drilled by a water mill drill.
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| CN201911127799.XA CN110820726A (en) | 2019-11-18 | 2019-11-18 | Pile foundation pore-forming method in environment where disturbance is not suitable for surrounding of hard rock in mountainous area |
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| CN201911127799.XA CN110820726A (en) | 2019-11-18 | 2019-11-18 | Pile foundation pore-forming method in environment where disturbance is not suitable for surrounding of hard rock in mountainous area |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114482083A (en) * | 2020-10-25 | 2022-05-13 | 中交路桥建设有限公司 | Anti-slide pile construction method for existing road widening section cutting rock slope |
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| JPH05247939A (en) * | 1992-03-04 | 1993-09-24 | Taisei Corp | Demolition method of obstruction in deep ground |
| CN104990467A (en) * | 2015-05-22 | 2015-10-21 | 深圳市工勘岩土集团有限公司 | Digging pile hard rock section combined construction method |
| CN106930276A (en) * | 2017-04-11 | 2017-07-07 | 广州智弘建筑物检测与鉴定技术有限公司 | The deep hole blasting of rotary digging bored concrete pile and the construction method of conduit rotary digging removing obstacles |
| CN107059847A (en) * | 2017-06-20 | 2017-08-18 | 中国华西企业有限公司 | A kind of competent bed water mill bores pouring pile hole structure and its construction from the bottom of one's heart |
| CN107762399A (en) * | 2017-11-24 | 2018-03-06 | 中交第二航务工程局有限公司 | Explosion coordinates rotary drilling rig deep layer one-step pore-creating construction method |
| CN110029659A (en) * | 2019-04-19 | 2019-07-19 | 中铁四局集团有限公司 | One-time hole forming construction method for manual hole digging pile combining hollow hole blasting and rotary digging |
-
2019
- 2019-11-18 CN CN201911127799.XA patent/CN110820726A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05247939A (en) * | 1992-03-04 | 1993-09-24 | Taisei Corp | Demolition method of obstruction in deep ground |
| CN104990467A (en) * | 2015-05-22 | 2015-10-21 | 深圳市工勘岩土集团有限公司 | Digging pile hard rock section combined construction method |
| CN106930276A (en) * | 2017-04-11 | 2017-07-07 | 广州智弘建筑物检测与鉴定技术有限公司 | The deep hole blasting of rotary digging bored concrete pile and the construction method of conduit rotary digging removing obstacles |
| CN107059847A (en) * | 2017-06-20 | 2017-08-18 | 中国华西企业有限公司 | A kind of competent bed water mill bores pouring pile hole structure and its construction from the bottom of one's heart |
| CN107762399A (en) * | 2017-11-24 | 2018-03-06 | 中交第二航务工程局有限公司 | Explosion coordinates rotary drilling rig deep layer one-step pore-creating construction method |
| CN110029659A (en) * | 2019-04-19 | 2019-07-19 | 中铁四局集团有限公司 | One-time hole forming construction method for manual hole digging pile combining hollow hole blasting and rotary digging |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114482083A (en) * | 2020-10-25 | 2022-05-13 | 中交路桥建设有限公司 | Anti-slide pile construction method for existing road widening section cutting rock slope |
| CN114482083B (en) * | 2020-10-25 | 2024-04-26 | 中交路桥建设有限公司 | Construction method for cutting rock slope slide-resistant pile of existing road widening section |
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Application publication date: 20200221 |
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