CN109750665B - Treatment method for boulder encountered during sinking of steel pile casing of drilled pile - Google Patents
Treatment method for boulder encountered during sinking of steel pile casing of drilled pile Download PDFInfo
- Publication number
- CN109750665B CN109750665B CN201910016415.0A CN201910016415A CN109750665B CN 109750665 B CN109750665 B CN 109750665B CN 201910016415 A CN201910016415 A CN 201910016415A CN 109750665 B CN109750665 B CN 109750665B
- Authority
- CN
- China
- Prior art keywords
- boulder
- steel casing
- steel
- casing
- drilling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The invention discloses a method for treating boulder encountered during sinking of a steel pile casing of a bored pile, which relates to the technical field of bored pile construction and comprises the following steps: carrying out slag removal operation on the bottom of the steel casing, and carrying out multiple crushing drilling on the boulder at the bottom opening of the steel casing by adopting a first drill bit; carrying out multiple crushing drilling on the boulder in the boulder crushing blind area at the bottom opening of the steel casing by adopting a second drill bit; carrying out slag removal operation on the bottom of the steel protecting cylinder again, hammering the steel protecting cylinder, manually touching the bottom opening of the steel protecting cylinder if the steel protecting cylinder cannot normally sink, and crushing and drilling after manual positioning if boulders still remain on the bottom opening of the steel protecting cylinder; lengthening the steel casing, continuing to carry out hammering sinking operation, and repeating the steps if encountering boulders until the steel casing enters the designed stratum depth. The invention can efficiently and reliably remove the boulder.
Description
Technical Field
The invention relates to the technical field of bored pile construction, in particular to a method for treating boulder caused by sinking of a steel casing of a bored pile.
Background
Referring to fig. 1, when a bored pile is constructed in an area where the bedrock is granite, boulders, namely granite spherical weathers, are often encountered, which causes difficulty in driving a steel casing or forming a bored pile. The soil body property of the mouth of the drilled pile is poor in a certain length range, so that a steel casing is required to be used for protecting the wall, and the hole wall is prevented from collapsing. The steel protects a section of thick bamboo and squeezes in-process and meet granite boulder because granite boulder intensity is higher, causes the steel to protect a section of thick bamboo and can't normally transfer to the design depth, if insert by force and beat, often protects a section of thick bamboo end opening even the turn-up is serious also can't continue to squeeze in.
The common engineering measures for treating the boulder caused by the sinking of the steel casing mainly comprise the following steps:
the excavation method can directly excavate the boulder to expose and then carry out crushing and removal when the boulder is buried shallowly. However, when the depth of the boulder is large or underground water is abundant, the method needs to adopt a foundation pit enclosure structure, and the economy is poor.
And in the blasting method, after the steel casing sinks and meets the boulder, the soil body in the steel casing is manually excavated until the boulder is exposed, a blasting hole is drilled on the boulder, and the boulder is blasted and removed after the explosive is filled. The method has the advantages that the medicine loading is difficult to control, the steel casing can deform when the medicine loading is too large, meanwhile, the disturbance on the peripheral soil body is too large, and the treatment efficiency is low when the medicine loading is too small. In addition, it is very difficult to drill blast holes in underwater construction or when underground water is abundant.
According to the hole sweeping method, after the steel casing sinks and meets boulders, the boulders are removed by the hole forming drill, under the condition, the drill bit of the hole forming drill cannot drill out the lower bottom opening of the casing because the steel casing impacts the bottom curling edge in the sinking process, so that the boulders cannot be drilled and broken, and the drill bit of the drill is easy to wear. Even if the bottom of the steel pile casing is not curled and deformed, the steel pile casing is difficult to follow and sink due to incomplete treatment of the boulder caused by the gap between the steel pile casing and the hole-forming drilling machine.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for treating boulder caused by sinking of a steel casing of a bored pile, which can efficiently and reliably remove the boulder.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows: a treatment method for boulder encountering during sinking of a steel pile casing of a bored pile comprises the following steps:
s1, performing slag removal operation on the bottom of the steel casing, and performing multiple crushing drilling on the boulder at the bottom opening of the steel casing by adopting a first drill bit;
s2, performing multiple crushing drilling on the boulder in the boulder crushing blind area at the bottom opening of the steel casing by adopting a second drill;
s3, carrying out slag removal operation on the bottom of the steel protective cylinder again, hammering the steel protective cylinder, manually touching the bottom opening of the steel protective cylinder if the steel protective cylinder cannot normally sink, and manually positioning and then crushing and drilling if boulders still remain in the bottom opening of the steel protective cylinder;
and S4, lengthening the steel casing, continuing to carry out hammering sinking operation, and if encountering a boulder, repeatedly executing the steps S1-S3 until the steel casing enters the designed stratum depth.
On the basis of the technical scheme, the method for performing multiple crushing drilling on the boulder at the bottom opening of the steel casing by adopting the first drill bit comprises the following steps: firstly along the center of the steel casing, crushing and drilling, and then along the inner side edge of the steel casing, crushing and drilling.
On the basis of the technical scheme, the method for carrying out multiple times of crushing and drilling on the boulder in the boulder crushing blind zone at the bottom opening of the steel casing by adopting the second drill bit comprises the following steps: and adjusting a drilling mast of the rotary drilling rig to enable the drill rod to incline a certain angle to carry out crushing drilling on the boulders in the boulder crushing blind area at the bottom opening of the steel casing.
On the basis of the technical scheme, if the boulder is still remained at the bottom opening of the steel casing, the manual positioning post-crushing drilling comprises the following steps:
judging whether the boulder remained at the bottom opening of the steel casing is the boulder extending into the steel casing or the boulder within the thickness range of the steel casing;
if the boulder remained at the bottom opening of the steel casing is the boulder extending into the steel casing, a first drill bit with the diameter smaller than that of the drilled pile is adopted to carry out multiple crushing drilling on the boulder extending into the steel casing;
if the boulder remained at the bottom opening of the steel casing is the boulder within the thickness range of the steel casing, the steel casing is lifted to a preset height, the top opening of the steel casing is fixed, and a second drill bit is adopted to carry out crushing drilling on the boulder within the thickness range of the steel casing.
On the basis of the technical scheme, in the step S3, if the steel pile casing can not normally sink, the bottom opening of the steel pile casing is manually touched, and if the bottom opening of the steel pile casing deforms, the deformed bottom opening of the steel pile casing is cut.
On the basis of the technical scheme, the first drill bit is a drill bit with the diameter 0.6-0.8 times of the inner diameter of the steel casing.
On the basis of the technical scheme, the second drill bit is a drill bit with the diameter 0.9-0.95 times of the inner diameter of the steel casing.
On the basis of the technical scheme, when slag removal operation is carried out on the bottom of the steel pile casing, a drilling bucket with the diameter 0.3-0.7 times of the inner diameter of the steel pile casing is adopted for slag removal operation.
Compared with the prior art, the treatment method for the drilled pile steel casing sinking encountering the boulder comprises the steps of firstly adopting a first drill bit to crush and drill for multiple times to cover most of the area inside the steel casing, then adopting a second drill bit to crush and drill for multiple times to cover the boulder crushing blind area as far as possible, and adopting two drill bits to drill in a matched manner, so that the boulder can be efficiently and reliably removed, and the construction of the drilled pile steel casing is completed.
Drawings
FIG. 1 is a schematic view of a steel casing sinking in contact with boulders;
FIG. 2 is a schematic sectional view of a broken boulder in an embodiment of the present invention;
FIG. 3 is a schematic plan view of an embodiment of the invention illustrating the breaking of boulders;
FIG. 4 is a schematic cross-sectional view of the solitary stone breaking along the inner edge of the casing according to the embodiment of the invention; (ii) a
FIG. 5 is a schematic plan view of the solitary stone breaking along the inside edge of the casing in an embodiment of the present invention;
FIG. 6 is a schematic plan view of a second drill bit drilling a dead zone of boulder crushing in an embodiment of the present invention;
in the figure: 1-steel casing, 2-boulder, 3-first drill bit, 4-drilling machine, 5-boulder crushing blind zone and 6-second drill bit.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 2 to 5, an embodiment of the present invention provides a method for treating boulder subsidence of a steel casing of a bored pile, which is used for removing boulder by using a rotary drilling rig during construction of the steel casing of the bored pile, and includes the following steps:
and S1, performing slag removal operation on the bottom of the steel casing, and performing multiple crushing drilling on the boulder at the bottom opening of the steel casing by using a first drill bit. Specifically, as shown in fig. 2 and 3, the diameter of the steel casing is 4.5m, a first drill bit with the diameter of 3m is adopted to firstly drill along the center of the steel casing in a crushing manner, as shown in fig. 4 and 5, the drill bit is drilled along the inner side edge of the steel casing in a crushing manner for 4 times, through 4 times of drilling, the active area of the drill bit can mostly cover the internal area of the steel casing, a small part of boulder crushing blind area is left, and the boulder crushing blind area is shown in fig. 5.
And S2, performing multiple crushing drilling on the boulder in the boulder crushing blind area at the bottom opening of the steel casing by adopting a second drill bit. Specifically, as shown in fig. 5, after the drill bit is used for crushing and drilling, a plurality of boulder crushing dead zones are left, and as shown in fig. 6, a second drill bit with the diameter of 4.26m is used for crushing and drilling boulders in the boulder crushing dead zone at the bottom opening of the steel casing for a plurality of times.
And S3, carrying out slag removal operation on the bottom of the steel protective cylinder again, hammering the steel protective cylinder, manually touching the bottom opening of the steel protective cylinder if the steel protective cylinder cannot normally sink, and manually positioning and then crushing and drilling if boulders still remain in the bottom opening of the steel protective cylinder. Specifically, judging whether the boulder remained at the bottom opening of the steel casing is the boulder extending into the steel casing or the boulder within the thickness range of the steel casing; if the boulder remained at the bottom opening of the steel casing is the boulder extending into the steel casing, a first drill bit with the diameter smaller than that of the drilled pile is adopted to carry out multiple crushing drilling on the boulder extending into the steel casing; if the boulder remained at the bottom opening of the steel casing is the boulder within the thickness range of the steel casing, the steel casing is lifted to a preset height, the top opening of the steel casing is fixed, and a second drill bit is adopted to carry out crushing drilling on the boulder within the thickness range of the steel casing.
S4, lengthening the steel casing 1, continuing to perform hammering sinking operation, and repeating the steps S1-S3 if encountering boulders until the steel casing enters the designed stratum depth.
Compared with the prior art, the treatment method for the drilled pile steel casing sinking encountering the boulder comprises the steps of firstly adopting a first drill bit to crush and drill for multiple times to cover most of the area inside the steel casing, then adopting a second drill bit to crush and drill for multiple times to cover the boulder crushing blind area as far as possible, and adopting two drill bits to drill in a matched manner, so that the boulder can be efficiently and reliably removed, and the construction of the drilled pile steel casing is completed. In addition, the rotary drilling rig is used for driving the drill bit to remove the boulder, compared with an excavation method, the size of the boulder does not need to be considered, a foundation pit enclosure structure is not needed, the method is more economical, compared with an explosion method, the influence on the steel casing is small, the disturbance on the surrounding soil body is small, compared with a hole sweeping method, the gap between the steel casing and the hole forming rig is eliminated as far as possible, and the boulder treatment is more complete.
As a preferred embodiment, when the second drill bit is adopted to perform multiple times of crushing drilling on the boulder in the boulder crushing blind area at the bottom opening of the steel casing, the drill mast of the rotary drilling rig is adjusted to enable the drill rod to incline at a certain angle to perform crushing drilling on the boulder in the boulder crushing blind area at the bottom opening of the steel casing, and the boulder in the thickness range of the bottom opening of the steel casing can be made as clear as possible.
In a preferred embodiment, in step S3, if the steel casing cannot normally sink, the bottom opening of the steel casing is manually touched, and if the deformation of the bottom opening of the steel casing is found to cause the failure of normal sinking, the deformed bottom opening of the steel casing is cut, so as to avoid the abrasion of the drill bit during drilling.
In a preferred embodiment, the first drill is a drill with a diameter of 0.6 to 0.8 times the inner diameter of the steel casing. According to the embodiment of the invention, the diameter of the steel casing is 4.5m, the diameter of the first drill bit is 3m, and the diameter of the first drill bit is 0.6-0.8 times of the inner diameter of the steel casing, so that most of the area in the steel casing can be covered by crushing and drilling along the inner side edge of the steel casing for 4 times, and the boulder can be efficiently removed.
In a preferred embodiment, the second drill is a drill with a diameter of 0.9 to 0.95 times the inner diameter of the steel casing. The diameter of the steel casing is 4.5m, the diameter of the second drill bit is 4.26m, and the diameter of the second drill bit is 0.9-0.95 times of the inner diameter of the steel casing, so that the dead zone of boulder crushing after the first drill bit is crushed and drilled can be effectively covered as far as possible, and the boulder can be efficiently removed.
In a preferable embodiment, when slag removal operation is performed on the bottom of the steel casing, the slag removal operation is performed by using a drilling bucket with the diameter 0.3-0.7 times of the inner diameter of the steel casing. In the construction of the slag removal operation for many times, the size of the crushed rock can be effectively adapted by selecting the drill bucket of 0.3-0.7 times, and the slag removal operation can be rapidly completed.
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (6)
1. A processing method for a drilled pile steel casing sinking meeting boulders is used for clearing the boulders by a rotary drilling rig during the construction of the drilled pile steel casing, and is characterized in that:
s1, performing slag removal operation on the bottom of the steel casing, and performing multiple crushing drilling on the boulder at the bottom opening of the steel casing by adopting a first drill bit;
s2, performing multiple crushing drilling on the boulder in the boulder crushing blind area at the bottom opening of the steel casing by adopting a second drill;
s3, carrying out slag removal operation on the bottom of the steel protective cylinder again, hammering the steel protective cylinder, manually touching the bottom opening of the steel protective cylinder if the steel protective cylinder cannot normally sink, and manually positioning and then crushing and drilling if boulders still remain in the bottom opening of the steel protective cylinder;
s4, lengthening the steel casing, continuing to perform hammering sinking operation, and if encountering boulder, repeatedly executing the steps S1-S3 until the steel casing enters the designed stratum depth;
the method is characterized in that a first drill bit is adopted to carry out multiple crushing drilling on the boulder at the bottom opening of the steel casing, and comprises the following steps: firstly, crushing and drilling along the center of the steel casing, and then crushing and drilling along the edge of the inner side of the steel casing;
the method is characterized in that a second drill bit is adopted to perform multiple times of crushing and drilling on the boulder in the boulder crushing blind area at the bottom opening of the steel casing, and comprises the following steps: and adjusting a drilling mast of the rotary drilling rig to enable the drill rod to incline a certain angle to carry out crushing drilling on the boulders in the boulder crushing blind area at the bottom opening of the steel casing.
2. The method for treating boulder in subsidence of steel casing of drilled pile as claimed in claim 1, wherein if boulder still remains at bottom opening of steel casing, the drilling is broken after artificial positioning, comprising the following steps:
judging whether the boulder remained at the bottom opening of the steel casing is the boulder extending into the steel casing or the boulder within the thickness range of the steel casing;
if the boulder remained at the bottom opening of the steel casing is the boulder extending into the steel casing, a first drill bit with the diameter smaller than that of the drilled pile is adopted to carry out multiple crushing drilling on the boulder extending into the steel casing;
if the boulder remained at the bottom opening of the steel casing is the boulder within the thickness range of the steel casing, the steel casing is lifted to a preset height, the top opening of the steel casing is fixed, and a second drill bit is adopted to carry out crushing drilling on the boulder within the thickness range of the steel casing.
3. The method for treating boulder encountered by sinking of steel pile casing of drilled pile as claimed in claim 1, wherein in step S3, if the steel pile casing can not normally sink, the bottom opening of the steel pile casing is manually detected, comprising the following steps: and if the bottom opening of the steel casing is deformed, cutting the deformed bottom opening of the steel casing.
4. The method for treating boulder encountered by sinking of steel casing of bored pile according to claim 1, wherein: the first drill bit is a drill bit with the diameter 0.6-0.8 times of the inner diameter of the steel casing.
5. The method for treating boulder encountered by sinking of steel casing of bored pile according to claim 1, wherein: the second drill bit is a drill bit with the diameter 0.9-0.95 times of the inner diameter of the steel casing.
6. The method for treating boulder encountered by sinking of steel casing of bored pile according to claim 1, wherein: when slag removal operation is carried out on the bottom of the steel casing, a drilling bucket with the diameter 0.3-0.7 times of the inner diameter of the steel casing is adopted for slag removal operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910016415.0A CN109750665B (en) | 2019-01-08 | 2019-01-08 | Treatment method for boulder encountered during sinking of steel pile casing of drilled pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910016415.0A CN109750665B (en) | 2019-01-08 | 2019-01-08 | Treatment method for boulder encountered during sinking of steel pile casing of drilled pile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109750665A CN109750665A (en) | 2019-05-14 |
| CN109750665B true CN109750665B (en) | 2021-03-02 |
Family
ID=66405201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910016415.0A Active CN109750665B (en) | 2019-01-08 | 2019-01-08 | Treatment method for boulder encountered during sinking of steel pile casing of drilled pile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109750665B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110295616B (en) * | 2019-05-31 | 2021-08-27 | 武汉市武昌市政建设(集团)有限公司 | Open caisson construction method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108894230B (en) * | 2018-07-19 | 2020-08-18 | 中铁大桥局集团有限公司 | Method for treating boulder during sinking of pile casing |
-
2019
- 2019-01-08 CN CN201910016415.0A patent/CN109750665B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109750665A (en) | 2019-05-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108729924A (en) | A kind of urban hard rock tunnel mechanical excavation rapid constructing method | |
| CN106194193A (en) | The auxiliary excavation method of a kind of group hole, big cross section vertical shaft non-explosion large aperture | |
| KR101302554B1 (en) | Bit of hammer for drilling the ground | |
| CN109750665B (en) | Treatment method for boulder encountered during sinking of steel pile casing of drilled pile | |
| JP2009256999A (en) | Pile extracting construction method for existing hollow pile | |
| CN111577118B (en) | Mechanical rapid hole forming construction method for slide-resistant pile | |
| JP2007332559A (en) | Removal method for existing underground pile | |
| JP3683229B2 (en) | Existing pile removal method and equipment | |
| CN106499393A (en) | Compound seam tunnel way of escape Controlling of Coal Outburst method | |
| CN108894230B (en) | Method for treating boulder during sinking of pile casing | |
| JP7184007B2 (en) | steel pipe pile | |
| KR100478234B1 (en) | Pile excution machine using screw hammer | |
| CN211647984U (en) | Device for improving rock-entering efficiency of rotary drilling rig | |
| JP4253801B2 (en) | Tunnel construction method | |
| CN111335312A (en) | Rock-entering construction process for large-diameter lock catch steel pipe pile | |
| JPH11256970A (en) | Excavating method for hard rock bed and its device | |
| CN113154975A (en) | Anti-slide pile pre-drilling blasting excavation method | |
| CN113669002A (en) | Hard rock stratum combined hole forming construction method for large-diameter cast-in-place pile | |
| EP0990765B1 (en) | Percussive core barrel | |
| CN207813544U (en) | A kind of tubular drill bit | |
| CN112324441A (en) | Construction method for removing underground shield segments by full-slewing drilling machine | |
| CN112377093A (en) | Relates to a rotary drilling construction method for deep concrete blocks and gravel layers and special rotary drilling equipment | |
| KR200285602Y1 (en) | Pile excution machine using screw hammer | |
| US4844186A (en) | Replaceable well drill bit | |
| CN219012491U (en) | Percussion drill bit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |