CN113882801A - Rotary drilling pile foundation construction method for soil and hard rock combined stratum - Google Patents
Rotary drilling pile foundation construction method for soil and hard rock combined stratum Download PDFInfo
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- CN113882801A CN113882801A CN202111255747.8A CN202111255747A CN113882801A CN 113882801 A CN113882801 A CN 113882801A CN 202111255747 A CN202111255747 A CN 202111255747A CN 113882801 A CN113882801 A CN 113882801A
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- 238000005553 drilling Methods 0.000 title claims abstract description 65
- 239000011435 rock Substances 0.000 title claims abstract description 63
- 239000002689 soil Substances 0.000 title claims abstract description 26
- 238000010276 construction Methods 0.000 title claims abstract description 21
- 238000007689 inspection Methods 0.000 claims abstract description 5
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 8
- 239000012634 fragment Substances 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 230000036346 tooth eruption Effects 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
- E21B25/10—Formed core retaining or severing means
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B27/00—Containers for collecting or depositing substances in boreholes or wells, e.g. bailers, baskets or buckets for collecting mud or sand; Drill bits with means for collecting substances, e.g. valve drill bits
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B44/00—Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention provides a rotary drilling pile foundation construction method for a soil and hard rock combined stratum, which comprises the following steps: s1, embedding a pile casing; s2, the drilling machine adopts a cutting tooth drill bit to grind and drill into the soil layer, and the hard rock layer is judged to enter until the drilling is difficult and the drill is cut into rock blocks during the drilling; s3, replacing a cutting tooth drill bit of the drilling machine with a roller bit to carry out circular cutting core drilling, wherein the depth of the roller bit entering a bed rock surface is controlled to be 0.8-1.0 m each time; s4, when drilling to the designed pile bottom, replacing a roller bit of the drilling machine with a large-diameter expanding bit to expand the pile hole; s5, pile hole inspection; and S6, cleaning the holes. The invention adapts different drill bits according to different geological conditions of the stratum, the soil layer is drilled by a cutting tooth drill in a grinding mode, and the hard rock layer is drilled by a cone bit in a circular cutting core mode, so that the rapid hole forming of the soil and hard rock combined stratum is realized, the construction progress is accelerated, and the construction cost is reduced.
Description
Technical Field
The invention relates to the technical field of pile foundation construction of highway engineering and bridge engineering, in particular to a rotary drilling pile foundation construction method for a soil and hard rock combined stratum.
Background
According to the classification standard of rock hardness degree specified in geotechnical engineering investigation standard, the saturated uniaxial compressive strength is greater than 60MPa, and the rock is the hard rock stratum. When a bored pile is drilled, when a hard rock stratum is met, manual excavation and impact rock breaking are carried out in a conventional method, and manual hole digging and impact drilling are carried out to form holes corresponding to a hole forming mode. The safety risk of manual hole digging is high, the footage speed of the impact hole forming mode is low, and the construction period and the cost are increased.
In the prior art, the construction of a common rotary drilling rig mainly adopts rotary grinding, and the rotary drilling rig cannot effectively impact a hard rock layer under limited pressurizing load, so that the efficiency is low when the rotary drilling rig performs high-strength rock layer construction.
Therefore, how to improve the drilling efficiency of the hard rock formation becomes a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a rotary drilling pile foundation construction method for a soil and hard rock combined stratum, which has the advantages of high drilling speed and low construction cost.
In order to achieve the purpose, the invention provides a rotary drilling pile foundation construction method of a soil and hard rock combined stratum, which comprises the following steps:
s1, embedding a pile casing;
s2, the drilling machine adopts a cutting tooth drill bit to grind and drill into the soil layer, and the hard rock layer is judged to enter until the drilling is difficult and the drill is cut into rock blocks during the drilling;
s3, replacing a cutting tooth drill bit of the drilling machine with a roller bit to carry out circular cutting core drilling, wherein the depth of the roller bit entering a bed rock surface is controlled to be 0.8-1.0 m each time;
s4, when drilling to the designed pile bottom, replacing a roller bit of the drilling machine with a large-diameter expanding bit to expand the pile hole;
s5, pile hole inspection;
s6, cleaning holes;
further, in step S1, the inner diameter of the pile casing is 20-40 cm larger than the designed pile diameter, the top of the pile casing is 0.5m higher than the ground, and the top of the pile casing is provided with a paddle overflow port.
Further, in step S3, the roller cone drill bit includes a drill barrel for connecting to a drill rod of the drilling machine and eight roller cones mounted on a bottom surface of the drill barrel, the eight roller cones are arranged at equal intervals along a circumferential direction of the drill barrel, wherein four outer roller cones and four inner roller cones are alternately arranged.
Further, in step S3, the depth of the drill bit entering the rock is displayed according to the depth display of the operation chamber, when the depth of the drill bit entering the bed rock is judged to be 0.8m to 1.0m, pressurization is stopped, the drill bit alternately performs forward and reverse rotation operations at the hole bottom position, the rock core is ground off by using the cone, then the rock core is taken out, and one-time circular cutting core drilling is completed.
Further, in step S4, the rock mass around the core is crushed into fragments by the reamer bit and the fragments are screwed into the drill bucket and taken out of the hole.
The invention has the following beneficial effects:
the invention adapts different drill bits according to different geological conditions of the stratum, the soil layer is drilled by a cutting tooth drill in a grinding mode, and the hard rock layer is drilled by a cone bit in a circular cutting core mode, so that the rapid hole forming of the soil and hard rock combined stratum is realized, the construction progress is accelerated, and the construction cost is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a schematic illustration of the drilling of a soil layer;
FIG. 2 is a schematic view of drilling a hard formation;
FIG. 3 is a cross-sectional view of a roller cone drill bit;
FIG. 4 is a bottom view of a roller cone drill bit;
FIG. 5 is a schematic diagram of reaming a hard formation;
reference numerals
1-protecting the cylinder; 2-a drilling machine; 3-a pick bit; 4-a soil layer; 5-hard rock formation; a 6-cone drill bit; 61-a drill cylinder; 62-inner cone; 63-outer cone; 7-expanding a hole drill bit;
Detailed Description
In order to make the technical solutions and advantages of the embodiments of the present application more clearly understood, the following further detailed description of the embodiments of the present application with reference to the drawings makes it clear that the described embodiments are only a part of the embodiments of the present application, and are not an exhaustive list of all the embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
A rotary drilling pile foundation construction method for a soil and hard rock combined stratum comprises the following steps:
s1, embedding of pile casing 1:
the pile casing 1 has the functions of fixing the pile position, protecting the orifice from collapse, isolating ground water and protecting the water level in the hole from being higher than the construction water level so as to maintain the hole wall and guide the drilling hole. The top of the pile casing 1 is provided with a grout outlet, the inner diameter of the pile casing is 20-40 cm larger than the diameter of the pile, and the top of the pile casing is 0.5m higher than the ground. Clay is symmetrically and uniformly backfilled around the pile casing, and the pile casing is tamped in layers, so that the stability of the embedded pile casing is ensured, and the pile casing is prevented from deflecting during tamping.
S2, soil layer drilling:
as shown in fig. 1, a drilling machine 2 abrasively drills a soil layer 4 using a conventional pick bit 3, and judges to enter a hard rock layer 5 until drilling is difficult and the rock is cut into pieces while drilling.
S3, drilling a hard rock layer:
as shown in fig. 2, when drilling into a hard rock layer 5, the pick bit 3 of the drilling machine 2 is replaced with a roller bit 6 for circular core drilling.
As shown in fig. 3 and 4, the roller cone bit 6 comprises a drill barrel 61 for connecting with a drill rod of a drilling machine and eight roller cones arranged on the bottom surface of the drill barrel, wherein the eight roller cones are arranged at equal intervals along the circumference of the drill barrel, and four outer roller cones 62 and four inner roller cones 63 are alternately arranged. The cutting teeth are used for sliding, rolling and cutting the rock mass at the bottom of the hole, the rock stratum is subjected to middle core-remaining circular cutting, the rock mass is effectively cut off and divided, the circumference of the rock core in the hole is loosened and hollowed, and a crushing free surface is created for later putting in a cutting tooth drill to crush the rock core.
The depth of the cone bit entering the bed rock surface is controlled to be 0.8 m-1.0 m each time, and the rock core is not easy to take out due to too large or too small entering depth. And (3) displaying the rock-entering depth of the drill bit according to the depth display of the operation room, stopping pressurizing when judging that the depth of the drill bit entering the bedrock is 0.8-1.0 m, alternately performing positive and negative rotation operation on the drill bit at the bottom of the hole, grinding off the rock core by using a cone, and taking out the rock core to finish one-time circular cutting core drilling.
When the roller bit drills in rock, the bit is lifted out of the rock drilling surface every 15min, and slurry in the hole is used for cooling the bit, so that the problem that the drilling temperature is too high to cause burning during long-time drilling in bedrock is solved.
S4, reaming:
when drilling to the designed pile bottom, the roller bit 6 of the drilling machine is replaced by a large diameter reamer bit 7 to ream the pile hole, as shown in fig. 5. The rock mass around the core is crushed by the expanding bit 7 and is screwed into the broken rock blocks out of the taking hole in the drilling bucket, and in order to ensure that the broken rock blocks screwed into the drilling bucket do not fall into the air in the lifting process of the drill rod, the bottom of the cutting bit is a double-layer bottom. The double-layer bottom can rotate for an angle relatively to realize the opening and closing of the slag inlet. When drilling, the slag inlet is in an open state and is suitable for slag feeding. And after the secondary footage is finished, the drill bit is turned reversely by an angle to close the slag inlet, and the drill bit is in a completely closed state, so that the rock ballast in the barrel is ensured not to fall out of the barrel.
S5, pile hole inspection:
and after the formed hole reaches the designed elevation, checking the hole depth, the hole diameter, the hole wall, the verticality and the like, and taking measures to process when the formed hole is unqualified. The hole-forming inspection method is determined according to the hole diameter, when the drilled hole is a dry hole, the heavy hammer can be used for tamping the soil in the hole, the direct measurement by using a measuring rope and a measuring hole device is adopted, if underground water exists in the hole, the hole can be cleaned by adopting a pump suction reverse circulation slurry pumping method, and the hole measurement work of the drilled hole is carried out by adopting an underwater concrete pouring construction method.
S6, cleaning holes:
the precipitate was cleared out of the hole site. And (3) pouring underwater concrete, wherein the thickness of sediments at the bottom of the front hole is not more than 5cm, and the thickness of the friction pile is not more than 20 cm.
According to the technical scheme, different drill bits are adapted according to different geological conditions of the stratum, the soil layer is drilled in a grinding mode through a cutting tooth drill, and the hard rock layer is drilled in a circular cutting core mode through a cone bit, so that the quick hole forming of the soil and hard rock combined stratum is realized, the construction progress is accelerated, and the construction cost is reduced.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (5)
1. A construction method for a rotary drilling pile foundation of a soil and hard rock combined stratum is characterized by comprising the following steps:
s1, embedding a pile casing;
s2, the drilling machine adopts a cutting tooth drill bit to grind and drill into the soil layer, and the hard rock layer is judged to enter until the drilling is difficult and the drill is cut into rock blocks during the drilling;
s3, replacing a cutting tooth drill bit of the drilling machine with a roller bit to carry out circular cutting core drilling, wherein the depth of the roller bit entering a bed rock surface is controlled to be 0.8-1.0 m each time;
s4, when drilling to the designed pile bottom, replacing a roller bit of the drilling machine with a large-diameter expanding bit to expand the pile hole;
s5, pile hole inspection;
and S6, cleaning the holes.
2. The method for constructing the pile foundation of the rotary drilling rig in the soil and hard rock combined stratum according to claim 1, wherein in the step S1, the inner diameter of the pile casing is 20-40 cm larger than the designed pile diameter, the top of the pile casing is 0.5m higher than the ground, and the top of the pile casing is provided with a propeller overflow port.
3. The method for constructing the rotary drilling pile foundation of the soil and hard rock combined stratum according to claim 1, wherein in the step S3, the roller bit comprises a drill barrel used for being connected with a drill rod of the drilling machine and eight roller cones arranged on the bottom surface of the drill barrel, the eight roller cones are arranged at equal intervals along the circumferential direction of the drill barrel, and four outer roller cones and four inner roller cones are arranged in a staggered and alternate mode.
4. The method for constructing the pile foundation for the rotary drilling of the soil and hard rock combined stratum according to claim 1, wherein in the step S3, the depth of the drill bit entering the stratum is displayed according to the depth display of the operation chamber, when the depth of the drill bit entering the bedrock is judged to be 0.8-1.0 m, the pressurization is stopped, the drill bit alternately performs forward and reverse rotation operations at the hole bottom, the rock core is ground off by using a cone, then the rock core is taken out, and the one-time circular cutting core drilling is completed.
5. The method for constructing the pile foundation of the rotary drilling rig in the soil and hard rock combined stratum according to claim 1, wherein in the step S4, the rock mass around the core is crushed into fragments by using the reamer bit, and the fragments are screwed into the drill bucket and taken out of the hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111255747.8A CN113882801A (en) | 2021-10-27 | 2021-10-27 | Rotary drilling pile foundation construction method for soil and hard rock combined stratum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111255747.8A CN113882801A (en) | 2021-10-27 | 2021-10-27 | Rotary drilling pile foundation construction method for soil and hard rock combined stratum |
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| Publication Number | Publication Date |
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| CN113882801A true CN113882801A (en) | 2022-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111255747.8A Pending CN113882801A (en) | 2021-10-27 | 2021-10-27 | Rotary drilling pile foundation construction method for soil and hard rock combined stratum |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114383892A (en) * | 2022-03-25 | 2022-04-22 | 新乡滨湖生态园林(集团)有限公司 | Bridge foundation geology reconnaissance sampling device |
| CN114837166A (en) * | 2022-05-18 | 2022-08-02 | 中铁六局集团有限公司 | Construction method of pile foundation for complex terrain geology in mountainous area |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU713975A1 (en) * | 1966-04-22 | 1980-02-05 | Всесоюзный Ордена Трудового Красного Знамени Научно-Исследовательский Институт Буровой Техники | Drill bit |
| CN106245626A (en) * | 2016-08-15 | 2016-12-21 | 中建三局基础设施工程有限公司 | A kind of hard formation churning driven enters method |
| KR20190071145A (en) * | 2017-12-14 | 2019-06-24 | 조일래 | Core barrel bit for large diameter |
| CN111058767A (en) * | 2019-12-06 | 2020-04-24 | 广东省基础工程集团有限公司 | Construction method of rock-socketed cast-in-situ bored pile |
| CN213928244U (en) * | 2020-11-19 | 2021-08-10 | 青海省地质基础工程施工总公司 | Rotary digging gear core-taking barrel drill |
-
2021
- 2021-10-27 CN CN202111255747.8A patent/CN113882801A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU713975A1 (en) * | 1966-04-22 | 1980-02-05 | Всесоюзный Ордена Трудового Красного Знамени Научно-Исследовательский Институт Буровой Техники | Drill bit |
| CN106245626A (en) * | 2016-08-15 | 2016-12-21 | 中建三局基础设施工程有限公司 | A kind of hard formation churning driven enters method |
| KR20190071145A (en) * | 2017-12-14 | 2019-06-24 | 조일래 | Core barrel bit for large diameter |
| CN111058767A (en) * | 2019-12-06 | 2020-04-24 | 广东省基础工程集团有限公司 | Construction method of rock-socketed cast-in-situ bored pile |
| CN213928244U (en) * | 2020-11-19 | 2021-08-10 | 青海省地质基础工程施工总公司 | Rotary digging gear core-taking barrel drill |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114383892A (en) * | 2022-03-25 | 2022-04-22 | 新乡滨湖生态园林(集团)有限公司 | Bridge foundation geology reconnaissance sampling device |
| CN114837166A (en) * | 2022-05-18 | 2022-08-02 | 中铁六局集团有限公司 | Construction method of pile foundation for complex terrain geology in mountainous area |
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