CN113154975A - Anti-slide pile pre-drilling blasting excavation method - Google Patents
Anti-slide pile pre-drilling blasting excavation method Download PDFInfo
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- CN113154975A CN113154975A CN202110572101.6A CN202110572101A CN113154975A CN 113154975 A CN113154975 A CN 113154975A CN 202110572101 A CN202110572101 A CN 202110572101A CN 113154975 A CN113154975 A CN 113154975A
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- pile
- blasting
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- drilling
- rock mass
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- 238000005422 blasting Methods 0.000 title claims abstract description 78
- 238000005553 drilling Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000009412 basement excavation Methods 0.000 title claims abstract description 21
- 239000011435 rock Substances 0.000 claims abstract description 64
- 230000002093 peripheral effect Effects 0.000 claims abstract description 60
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 9
- 239000002689 soil Substances 0.000 claims abstract description 5
- 239000002360 explosive Substances 0.000 claims description 13
- 239000002893 slag Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 15
- 239000000463 material Substances 0.000 abstract description 2
- 238000004880 explosion Methods 0.000 description 7
- 238000005457 optimization Methods 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
-
- 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)
- Earth Drilling (AREA)
Abstract
The invention provides a pre-drilling blasting excavation method for an anti-slide pile, which relates to the technical field of geotechnical engineering and comprises the following steps: s1: drilling a plurality of peripheral holes downwards along the profile line of the section of the anti-slide pile, wherein the plurality of peripheral holes are used for separating a pile peripheral rock mass and a pile core rock mass; s2: drilling a plurality of micro-blast holes downwards in the middle of the pile core rock mass; s3: embedding blasting materials into the micro blasting holes, and blasting the pile core rock mass; s4: and after blasting, taking out the residual soil to form a pile hole, and inserting the slide-resistant pile into the pile hole. By adopting the scheme, the construction method is simple and easy to implement, can effectively protect and reduce the blasting vibration of the hard rock and the blasting damage to the rock mass around the pile, can adopt the expanding agent for blasting when the construction site is close to a building, further weakens the influence of the blasting vibration on the surrounding environment, and has better popularization value.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering, in particular to a pre-drilling blasting excavation method for an anti-slide pile.
Background
The hole forming size of the rectangular-section slide-resistant pile is larger, generally larger than 1.5m multiplied by 2.0m, no mature construction machine can vertically excavate the rectangular section with high efficiency at present, the pile hole construction still mainly adopts manual hole excavation, and hard bedrock or boulder is assisted with hole blasting. Because the face of the slide-resistant pile hole is of a vertical well-shaped structure, the blasting stress in the hole is small in the face release, most of the blasting stress is absorbed by the rock mass around the pile, so that the blast damage cracks of the foundation rock around the pile are caused, the bearing capacity of the rock mass around the pile is seriously reduced, and particularly the horizontal bearing capacity of an anchoring section for determining the success or failure of the slide-resistant pile is determined. In a steep slope section, because the front edge of the outer edge of the bedrock gradually increases from top to bottom: is triangular; in certain circumstances, such as an unfavorable combination of joint fractures or excessive blast charge, it is highly likely that the edge will loosen and collapse due to the blast. Whether the base rock around the pile is exploded and loosened or the front edge is damaged and destroyed, the construction of the anti-slide pile is seriously influenced, and the bearing capacity of the rock around the pile deviates from the designed value and becomes huge potential safety hazard. Therefore, it is necessary to adopt a non-blasting or controlled blasting method in the hole of the bedrock section to solve the problems.
Disclosure of Invention
The invention aims to solve the problems and provides a pre-drilling blasting excavation method for the slide-resistant pile.
The technical scheme adopted by the invention is as follows: a pre-drilling blasting excavation method for slide-resistant piles comprises the following steps:
s1: drilling a plurality of peripheral holes downwards along the profile line of the section of the anti-slide pile, wherein the plurality of peripheral holes are used for separating a pile peripheral rock mass and a pile core rock mass;
s2: drilling a plurality of micro-blast holes downwards in the middle of the pile core rock mass;
s3: embedding blasting materials into the micro blasting holes, and blasting the pile core rock mass;
s4: and after blasting, taking out the residual soil to form a pile hole, and inserting the slide-resistant pile into the pile hole.
When the scheme is operated, a contour line of the bottom section of the anti-slide pile is drawn on the pre-drilled anti-slide pile hole, a plurality of peripheral holes are drilled downwards along the contour line, after the peripheral holes are drilled, the peripheral holes separate a pile peripheral rock mass from a pile core rock mass, and the pile hole can be formed only by taking out the pile core rock mass; when the pile core rock mass needs to be taken out, the pile core rock mass needs to be exploded in an explosion mode, a plurality of micro explosion holes are drilled downwards in the middle of the pile core rock mass, and an explosive is placed in each micro explosion hole.
Further optimize, for when separating stake peri rock mass and stake core rock mass, reduce the quantity in all edges hole, set up to: the midpoint of the top of the perimeter hole is located on the contour line.
Further optimize, for separating stake peri rock mass and stake core rock mass completely, set up to: the peripheral holes are uniformly arranged along the contour line.
Further optimize, for reducing the degree of difficulty of getting the slot hole, set up as: and a plurality of peripheral holes are sequentially arranged along the length direction of the pile hole.
Further optimize, for reducing the impact that the peripile rock mass received because of the blasting, set up as: the bottom of the peripheral holes are inclined towards the outer side.
Further optimization, for facilitating drilling, the method comprises the following steps: the bottom of the peripheral holes inclines towards the outside at an angle of 5-10 degrees.
Further optimize, for the once-through whole burst open pile core rock mass, set up as: the micro-blasting holes are uniformly arranged along the transverse axis and the longitudinal axis of the cross section of the slide-resistant pile.
Further optimizing, adopting a handheld core drill to drill a plurality of peripheral holes.
Further optimization, a wind gun or a core drill is adopted to drill the micro-blast hole.
Preferably, the explosive is explosive or expanding agent.
The working principle of the scheme is as follows: the method comprises the steps of presetting a contour line of a section of a rectangular slide-resistant pile at a construction position, drilling a plurality of peripheral holes downwards on the contour line of the section of the slide-resistant pile by using a handheld coring drilling machine, wherein the midpoints of the sections of the tops of the plurality of peripheral holes drilled along the contour line are positioned on the contour line, so that the diameter of each peripheral hole can be the largest in section size, and the number of the peripheral holes drilled is reduced; the plurality of peripheral holes are uniformly arranged along the contour line until the peripheral holes are drilled on the periphery of the section of the anti-slide pile, and the pile core rock mass and the pile peripheral rock mass can be separated; when the pre-drilled pile hole is deep, a plurality of peripheral holes are sequentially drilled along the length direction of the pile hole, namely towards the lower part of the pile hole, and the bottom of each peripheral hole is required to incline outwards by about 5-10 degrees, so that the damage of blasting stress to rock mass around the pile is reduced;
then, drilling a plurality of micro-blasting holes at the pile core rock mass by using an air gun or a core drill, namely drilling the micro-blasting holes downwards in the middle of the section of the anti-slide pile, wherein the hole depth of the micro-blasting holes is consistent with that of peripheral holes, and the micro-blasting holes are uniformly distributed along the transverse axis and the longitudinal axis of the section of the anti-slide pile, so that the pile core rock mass can be completely blasted; then, embedding blasting objects in the micro blasting holes, wherein the blasting objects are preferably some conventional explosives or expanding agents, and when the construction site is close to a building, blasting by adopting the expanding agents can further weaken the influence of blasting vibration on the surrounding environment; after blasting, digging and taking dregs generated by blasting, forming a pile hole at the moment, and inserting a rectangular slide-resistant pile into the pile hole to complete one construction cycle.
The invention has the following beneficial effects:
the scheme provides an anti-slide pile pre-drilling blasting excavation method, and by adopting the scheme, the construction method is simple and easy to implement, can effectively protect and reduce the blasting vibration of hard rocks and the blasting damage to rock mass around the pile, can adopt the blasting of an expanding agent when a construction site is close to a building, further weakens the influence of the blasting vibration on the surrounding environment, and has better popularization value.
Drawings
Fig. 1 is a construction top view of a pre-drilling blasting excavation method for an anti-slide pile provided by the invention;
fig. 2 is a construction cross-sectional view of the anti-slide pile pre-drilling blasting excavation method provided by the invention.
The reference numbers in the figures are: 1-contour line, 2-peripheral hole, 3-micro blast hole and 4-pile hole.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example (b): as shown in fig. 1 and 2, a method for pre-drilling blasting excavation of slide-resistant piles comprises the following steps:
s1: drilling a plurality of peripheral holes 2 downwards along the cross section contour line 1 of the anti-slide pile, wherein the plurality of peripheral holes 2 are used for separating a pile peripheral rock mass from a pile core rock mass;
s2: drilling a plurality of micro-blast holes 3 downwards in the middle of the pile core rock mass;
s3: embedding explosives into the micro blasting holes 3 and blasting the pile core rock mass;
s4: and after blasting, taking out the slag soil to form a pile hole 4, and inserting the slide-resistant pile into the pile hole 4.
In the embodiment, a contour line 1 of the cross section of the bottom of the anti-slide pile is drawn on a pre-drilled anti-slide pile hole 4, a plurality of peripheral holes 2 are drilled downwards along the contour line 1, after the peripheral holes 2 are drilled, the peripheral holes 2 separate a pile peripheral rock mass from a pile core rock mass, and the pile hole 4 can be formed only by taking out the pile core rock mass; when the pile core rock mass needs to be taken out, the pile core rock mass needs to be exploded in an explosion mode, a plurality of micro-explosion holes 3 are drilled downwards in the middle of the pile core rock mass, and an explosive is placed in each micro-explosion hole 3, when the pile core rock mass is exploded by the explosive, the peripheral holes 2 separate the pile peripheral rock mass and the pile core rock mass, so that the explosive force cannot damage the pile peripheral rock mass, the bearing capacity of the pile peripheral rock mass is stabilized, after the explosion, the exploded soil slag is taken out to form pile holes 4, and anti-sliding piles are inserted in the pile holes 4.
In this embodiment, for in the time of separating stake zhou rock mass and stake core rock mass, reduce the quantity in all holes 2, set up to: the midpoint of the top of the perimeter hole 2 is located on the contour line 1.
In this embodiment, for the complete peripile rock mass and the stake core rock mass of separating, set up to: a plurality of the peripheral holes 2 are uniformly arranged along the contour line 1.
In this embodiment, in order to reduce the difficulty of drilling the slot hole, the setting is: a plurality of peripheral holes 2 are sequentially arranged along the length direction of the pile hole 4.
In this embodiment, for reducing the impact that the stake peri rock mass received because of the blasting, set up as: the bottoms of a plurality of the peripheral holes 2 are inclined towards the outer side.
In this embodiment, for facilitating drilling, the following are provided: the bottom of the peripheral holes 2 inclines towards the outside at an angle of 5-10 degrees.
In this embodiment, for the once-through whole core rock that bursts open, set up to: the micro-blasting holes 3 are uniformly arranged along the transverse axis and the longitudinal axis of the cross section of the slide-resistant pile.
In this embodiment, a plurality of peripheral holes 2 are drilled using a hand held coring drill.
In this embodiment, the micro blast hole 3 is drilled by using a pneumatic gun or a core drill.
In this embodiment, the explosive is an explosive or an expanding agent.
The working principle of the scheme is as follows: the method comprises the steps of presetting a contour line 1 of a rectangular slide-resistant pile section at a construction position, drilling a plurality of peripheral holes 2 downwards on the contour line 1 of the slide-resistant pile section by using a handheld coring drilling machine, and positioning the middle points of the top sections of the plurality of peripheral holes 2 drilled along the contour line 1 on the contour line 1, so that the diameter of each peripheral hole 2 can be the largest section size, and the number of the peripheral holes 2 drilled is reduced; the plurality of peripheral holes 2 are uniformly arranged along the contour line 1, and the pile core rock mass and the pile peripheral rock mass can be separated until the peripheral holes 2 are completely drilled at the periphery of the section of the anti-slide pile; when the pre-drilled pile hole 4 is deep, a plurality of peripheral holes 2 are sequentially drilled along the length direction of the pile hole 4, namely towards the lower part of the pile hole 4, and the bottom of each peripheral hole 2 is required to incline outwards by about 5-10 degrees, so that the damage of blasting stress to rock mass around the pile is reduced;
then, drilling a plurality of micro-blasting holes 3 at the pile core rock mass by using an air gun or a core drill, namely drilling the micro-blasting holes 3 downwards in the middle of the section of the anti-slide pile, wherein the hole depth of the micro-blasting holes 3 is consistent with that of the peripheral holes 2, and the micro-blasting holes 3 are uniformly distributed along the transverse axis and the longitudinal axis of the section of the anti-slide pile, so that the pile core rock mass can be completely blasted; then, a blasting object is embedded in the micro blasting hole 3, wherein the blasting object is preferably some conventional explosives or expanding agents, and when a construction site is close to a building, the blasting object can be blasted by adopting the expanding agents, so that the influence of blasting vibration on the surrounding environment can be further weakened; after blasting, digging and taking dregs generated by blasting, forming a pile hole 4 at the moment, and inserting a rectangular slide-resistant pile into the pile hole 4 to complete one construction cycle.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The pre-drilling blasting excavation method of the slide-resistant pile is characterized by comprising the following steps of:
s1: drilling a plurality of peripheral holes (2) downwards along the cross section contour line (1) of the anti-slide pile, wherein the peripheral holes (2) are used for separating a pile peripheral rock mass and a pile core rock mass;
s2: drilling a plurality of micro-blast holes (3) downwards in the middle of the pile core rock mass;
s3: embedding explosives into the micro blasting holes (3) and blasting the pile core rock mass;
s4: and after blasting, taking out the slag soil to form a pile hole (4), and inserting the slide-resistant pile into the pile hole (4).
2. The slide-resistant pile pre-drilling blasting excavation method of claim 1, wherein the midpoint of the top of the peripheral hole (2) is located on the contour line (1).
3. The slide-resistant pile pre-drilling blasting excavation method of claim 1, wherein the plurality of peripheral holes (2) are uniformly arranged along a contour line.
4. The pre-drilling blasting excavation method of the slide-resistant pile according to claim 1, characterized in that a plurality of peripheral holes (2) are sequentially arranged along the length direction of the pile hole (4).
5. The slide-resistant pile pre-drilling blasting excavation method of claim 1, wherein the bottoms of the peripheral holes (2) are all inclined towards the outer side.
6. The slide-resistant pile pre-drilling blasting excavation method of claim 5, wherein the bottom of the peripheral holes (2) is inclined towards the outside by 5-10 degrees.
7. The slide-resistant pile pre-drilling blasting excavation method according to claim 1, wherein the micro blasting holes (3) are uniformly arranged along the transverse axis and the longitudinal axis of the cross section of the slide-resistant pile.
8. The slide-resistant pile pre-drilling blasting excavation method as claimed in claim 1, wherein a plurality of peripheral holes (2) are drilled by a handheld core drilling machine.
9. The slide-resistant pile pre-drilling blasting excavation method as claimed in claim 1, wherein the micro blasting holes (3) are drilled by using a pneumatic gun or a core drill.
10. The method for pre-drilling blasting excavation of the slide-resistant pile according to claim 1, wherein the blasting substance is explosive or expanding agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110572101.6A CN113154975A (en) | 2021-05-25 | 2021-05-25 | Anti-slide pile pre-drilling blasting excavation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110572101.6A CN113154975A (en) | 2021-05-25 | 2021-05-25 | Anti-slide pile pre-drilling blasting excavation method |
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| CN113154975A true CN113154975A (en) | 2021-07-23 |
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| CN202110572101.6A Pending CN113154975A (en) | 2021-05-25 | 2021-05-25 | Anti-slide pile pre-drilling blasting excavation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113737781A (en) * | 2021-09-13 | 2021-12-03 | 中建一局集团第二建筑有限公司 | Combined type hole digging pile construction structure and construction method thereof |
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2021
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Application publication date: 20210723 |