CN111550190A - Core bit is got in concrete drilling bored concrete pile defective pile restoration processing - Google Patents
Core bit is got in concrete drilling bored concrete pile defective pile restoration processing Download PDFInfo
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- CN111550190A CN111550190A CN202010054031.0A CN202010054031A CN111550190A CN 111550190 A CN111550190 A CN 111550190A CN 202010054031 A CN202010054031 A CN 202010054031A CN 111550190 A CN111550190 A CN 111550190A
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- 230000002950 deficient Effects 0.000 title claims abstract description 39
- 238000012545 processing Methods 0.000 title claims abstract description 17
- 238000005553 drilling Methods 0.000 title description 26
- 238000000034 method Methods 0.000 claims abstract description 19
- 238000011065 in-situ storage Methods 0.000 claims abstract description 15
- 238000009434 installation Methods 0.000 claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 51
- 239000010959 steel Substances 0.000 claims description 51
- 230000008439 repair process Effects 0.000 abstract description 7
- 238000010276 construction Methods 0.000 abstract description 6
- 230000002787 reinforcement Effects 0.000 description 7
- 238000003466 welding Methods 0.000 description 7
- 230000007547 defect Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- E21B10/00—Drill bits
- E21B10/02—Core 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
- E21B10/00—Drill bits
- E21B10/44—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts
-
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (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)
- Mechanical Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention provides a core bit for repairing and processing a defective pile of a concrete cast-in-situ bored pile. The invention comprises an upper connecting assembly, a middle cylinder body and an annular cutter head, wherein the upper connecting assembly, the middle cylinder body and the annular cutter head are welded together in sequence; the method is characterized in that: a group of parallel wear-resistant strips are arranged on the middle cylinder body; the annular tool bit comprises a cutting edge ring, a group of tool bit bodies are arranged on the cutting edge ring along the circumferential direction, and the installation angles of the tool bit bodies are installed at equal intervals according to four angles of outwards-10 degrees, outwards-5 degrees, 0 degrees and inwards-5 degrees by taking the cutting edge ring plane as a reference. The drill bit provided by the invention is used in the repair process of the defective pile of the concrete cast-in-situ bored pile, so that the repair cost of the defective pile can be greatly reduced, and the construction period is shortened.
Description
The technical field is as follows:
the invention relates to a core bit for repairing and processing a defective pile of a concrete cast-in-situ bored pile, and belongs to the technical field of environment-friendly equipment.
Background art:
the bridge foundation pile in highway engineering and municipal engineering is used as an important load-bearing and load-transferring substructure, and the detection and acceptance requirements after pile forming are stricter. The prior art has the following methods for processing the defective pile:
firstly, abandon treatment: the method comprises the steps of determining the defect position of a pile body by using a sound wave transmission method through a sound measurement pipe, crushing and removing all the pile bodies of the whole pile and a reinforcement cage by using a large-sized impact drill and an impact hammer, backfilling dense pile holes in layers, and then drilling in situ again to carry out cast-in-place pile construction.
Secondly, traditional coring treatment utilizes the core equipment is got in minor diameter drilling, along pile body steel reinforcement cage inboard, gets a core a week, then chisels out core concrete, pours the concrete again behind the clearance chisel hair pore wall. This method is only employed when the objective environment does not allow the first method.
In the above method, the first elimination treatment is the treatment of the shallow defective pile (within 5 m underground), which is acceptable in terms of economic cost and working hours, but once the position of the defective pile is deeper, the economic cost rises sharply, the cost is about 2.5-3 times of the pile forming cost, and the treatment of the single-hole large-diameter long pile takes more than millions. Meanwhile, the processing time is very long, the delay of the single-pile construction period is usually more than one month, and the economic cost and the time cost are huge.
The second coring treatment is also limited to shallow defective piles, and due to the adoption of small-sized coring equipment, once a deep defective pile is drilled, the time for rotating into and separating the core concrete along the inner side of the reinforcement cage of the pile body is quite long, and the core concrete is removed by adopting small-sized machinery matched with manual work, so that the delayed time is longer, after the core concrete in the hole channel is removed, because the inner wall of the hole is left with a smooth surface, the concrete can be poured again by secondary roughening, therefore, compared with the first method, the method has the advantages that the reinforcement cage framework is reserved, the cost of the small-sized machinery and large-sized machinery is relatively low, the processing time is too long, the potential safety hazard of manual long-time underground operation is still existed, and even the problem that the deep-hole pile cannot be processed is faced.
The invention content is as follows:
the invention aims to provide a core bit for repairing a defective pile of a concrete cast-in-situ bored pile, which can greatly reduce the repairing cost of the defective pile and shorten the construction period.
The above purpose is realized by the following technical scheme:
a core bit for repairing and processing a defective pile of a concrete cast-in-situ bored pile comprises an upper connecting assembly, a middle barrel body and an annular cutter head, wherein the upper connecting assembly, the middle barrel body and the annular cutter head are sequentially welded together; a group of parallel wear-resistant strips are arranged on the middle cylinder body; the annular tool bit comprises a cutting edge ring, a group of tool bit bodies are arranged on the cutting edge ring along the circumferential direction, and the installation angles of the tool bit bodies are installed at equal intervals according to four angles of outwards-10 degrees, outwards-5 degrees, 0 degrees and inwards-5 degrees by taking the cutting edge ring plane as a reference.
Concrete drilling bored concrete pile defect stake repair handle coring bit, the assembly is connected on upper portion includes the upper disc board, the center installation square head of upper disc board, the square head outside is provided with the square hoop, the square head with the welding has the support scute between the upper disc board.
The core bit is handled in concrete drilling bored concrete pile defective pile restoration, the lower surface of upper plate is the rough surface.
Concrete drilling bored concrete pile defect stake repair handle coring bit, the middle part stack shell includes a steel cylinder, steel cylinder upper portion welding the hanging wall board, steel cylinder lower part welding annular tool bit, the stack shell outer wall welding of steel cylinder wear resistant strip.
The core bit is handled in concrete drilling bored concrete pile defective pile restoration, the installation inclination of wear-resisting strip on the outer wall of steel cylinder is 20 degrees.
The core bit is handled in concrete bored concrete pile defective pile restoration, 8 wear-resisting strips altogether, four a set of, the symmetry sets up in the 1/4 area of steel cylinder outer wall, and the vertical projection length of every wear-resisting strip no more than 1/4 steel cylinder peripheral length, the strip interval is 1/4 steel cylinder height, the width of every wear-resisting strip should be < the biggest installation angle of tool bit body.
The core drill bit is taken in concrete bored concrete pile defective pile restoration processing, it equals the steel cylinder internal diameter to go up the wall plate diameter, the whole external diameter of blade ring installation tool bit equals defective pile and treats restoration core concrete column diameter.
The core drill bit is handled in concrete bored concrete pile defective pile restoration, the total height of upper plate, steel cylinder, sword mouth ring adopts 1200 mm.
Has the advantages that:
1. when the coring bit is used for drilling and coring to repair the defective pile, the annular concrete protective layers on the inner side and the outer side of the main steel reinforcement cage are kept and protected; secondly, in the maintenance process, the soil body around the pile is not interfered, and the side friction resistance of the pile body is not influenced. The improvement of the two aspects leads the resource and the economic benefit to be obviously improved, therefore, the diameter of the drill bit is determined to be 900mm according to the diameter of the repaired defective pile, the strength of the pile body concrete and the power of a drilling machine to be adopted are important factors for determining the height of the drill bit, and the height size of the drill bit takes a plurality of factors into consideration, so as to avoid that the top surface of the core concrete column cannot rise to the upper plate due to too large resistance of the drill bit, or the steel cylinder cannot twist off the core concrete column, or the twisted off concrete column cannot be lifted to the ground. Such as the rated torque of a drilling machine, the twist-off torque of a core concrete column, the friction force in a barrel successfully improving the hole by overcoming the gravity of the twist-off core concrete column, and the like. 1200mm is used here. Multiple tests prove that the height of the drill bit is larger than the interval, and the resistance of the drill bit during drilling is too large to reach the designed coring length. Conversely, too small a height means that the concrete core column cannot be removed after the drill is completed.
2. According to the invention, the cylinder body is provided with the wear-resistant steel bars, and the wear-resistant bars are spirally and obliquely arranged along the inclination angle of the cylinder body of 20 degrees, so that in the drilling process of a drill bit, the increase of the wear-resistant steel bars enables the drill bit to automatically form a spiral groove on the inner wall when cutting a pile body, and the groove is enough for a rough surface required by subsequent concrete pouring.
Description of the drawings:
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is an assembled view of the upper assembly of the present invention;
FIG. 3 is a block diagram of a single square hoop member of the present invention;
FIG. 4 is a right side view of FIG. 3;
FIG. 5 is an assembled view of the square head of the present invention;
FIG. 6 is a structural view of the support gusset of the present invention;
FIG. 7 is a block diagram of the upper tray plate of the present invention;
FIG. 8 is an assembled perspective view of the middle barrel of the present invention;
FIG. 9 is a block diagram of the wear strip of the present invention;
FIG. 10 is a perspective assembly view of the annular cutter head of the present invention;
fig. 11 is a schematic view of the working state of the present invention.
In the figure: 1. an upper connection assembly; 2. a middle barrel body; 3. an annular cutter head; 11. an upper tray plate; 12. a square head; 13. a square hoop; 14. supporting the corner plate; 21. wear resistant strips; 22. a steel cylinder; 31. a lip ring; 32. a cutter head body.
The specific implementation mode is as follows:
example 1:
as shown in fig. 1-11: the core drill bit for repairing and processing the defective pile of the concrete cast-in-situ pile comprises an upper connecting assembly 1, a middle barrel body 2 and an annular cutter head 3, wherein the upper connecting assembly 1, the middle barrel body 2 and the annular cutter head 3 are welded together in sequence; a group of parallel wear-resistant strips 21 are arranged on the middle barrel body 2; the annular cutter head comprises a cutting edge ring 31, a group of cutter head bodies 32 are arranged on the cutting edge ring along the circumferential direction, and the installation angles of the cutter head bodies are installed at equal intervals according to four angles of outwards-10 degrees, outwards-5 degrees, 0 degrees and inwards-5 degrees by taking the cutting edge ring plane as a reference. As shown in fig. 12, the mounting angle of the bit body is according to-10 ° outward, i.e. a in the figure; outwardly-5 deg., as shown by B; 0 deg., shown as C in the figure; inwardly by 5 deg., as shown at D in the figure.
As shown in fig. 2-9, the upper connection assembly 1 includes an upper plate 11, a square head 12 is installed at the center of the upper plate, a square hoop 13 is arranged outside the square head, and a support angle plate 14 is welded between the square head and the upper plate.
Concrete drilling bored concrete pile defective pile repair handles coring bit, the middle part stack shell includes a steel cylinder 22, steel cylinder upper portion welding the hanging wall board, steel cylinder lower part welding annular tool bit, the stack shell outer wall welding of steel cylinder wear resistant strip 21.
The core bit is handled in concrete drilling bored concrete pile defective pile restoration, the lower surface of upper plate is the rough surface. Set up to the rough surface for creep into the upper surface of core concrete column and form bigger frictional force after hanging the disk plate contact, when so when the drilling rod pushes down and drives the steel drum rotatory, provide bigger moment of torsion, help twist off the interior concrete column of steel drum (get the core).
The core bit is handled in concrete drilling bored concrete pile defective pile restoration, the installation inclination of wear-resisting strip on the outer wall of steel cylinder is 20 degrees.
The core drill bit is processed in concrete bored pile defective pile restoration, 8 wear-resisting strips altogether, four a set of, the symmetry sets up in the 1/4 region of steel cylinder outer wall, and the vertical projection length of every wear-resisting strip no more than 1/4 steel cylinder outer perimeter, the strip interval is 1/4 steel cylinder height, the width of every wear-resisting strip should be < the biggest installation angle of tool bit body (-10 °), neither influence the drill bit and creep into, satisfy wear-resisting strip secondary again simultaneously and polish pile body inner wall, form spiral chisel hair line.
The core drill bit is processed in concrete bored concrete pile defective pile restoration, it equals the steel cylinder internal diameter to go up the wall plate diameter, the external diameter (tool bit external diameter) of blade ring equals the defective pile and waits to restore core concrete column diameter. The diameter is slightly smaller than the diameter of an inscribed circle between the acoustic pipes on the inner wall of the pile body reinforcement cage (considered according to the reserved acoustic pipes).
Concrete bored concrete pile defect stake repair handle coring bit, a plurality of factors need be considered on the principle to the overall height of going up plate, steel cylinder, sword mouth ring to the too big core concrete column top surface that leads to of drill resistance appears can't rise to the plate, or the steel cylinder can't twist off the core concrete column, again or the concrete column after twisting off can't propose to ground. Such as the rated torque of a drilling machine, the twist-off torque of a core concrete column, the friction force in a barrel successfully improving the hole by overcoming the gravity of the twist-off core concrete column, and the like. Here 1200mm is used.
The height of the steel cylinder is determined by the following method:
the continuous drilling conditions of the drill bit are as follows:
Tmachine for working＞TResistance deviceEquation 1
Rated (twist-off) torque of drilling machine
(or derived from machine configuration parameters)
P: rated (output) power unit of the motor is Kilowatt (KW)
n: rated speed unit is revolution per minute (r/min)
P and n can be looked up directly from the motor nameplate. Since P n are the rated values of the motor, T is the rated torque of the motor.
Resistance torque received during bit run-in:
σrftk equation 4
M＝F2L equation 8
L height of the Steel Cylinder (m)
D: inner diameter of steel cylinder (m)
d: diameter of upper plate mouth square hole circumcircle (m)
μ: coefficient of friction between steel cylinder side wall and concrete core column surface
f: side frictional resistance (kPa) between the surface of the steel cylinder and the concrete during drilling
F1Pressure of drill pipe on upper plate (kN)
F2Radial force (kN) of drill rod to upper plate
T:F1Torque (kN. m) applied to the fracture section by rotation of the drill rod
M:F2Moment of fracture section at butt edge (kN. m)
σ1: the pressure (kPa) transmitted by the upper plate to the top surface of the concrete column
W core concrete column section resistance moment (m3)
σr: total stress (mPa) caused by the effect of the drill rod on the section of the cutting edge
ftk tensile strength of concrete core (mPa)
From the formula 1, after the inner diameter D of the steel cylinder is determined and f is determined through experiments, the theoretical upper limit value of the height L of the steel cylinder meeting the continuous drilling condition can be obtained.
When F is shown in formula 41、F2After setting, the theoretical lower limit value of the height L of the steel cylinder can be obtained when the core concrete column twist-off requirement is met.
The height L of the actual steel cylinder can be determined within the interval and combined with the construction efficiency.
The assembling method comprises the following steps:
the assembly sequence of the drill bit is as follows: the assembling square head → the square head, the upper disc plate, the supporting angle plate and the square hoop are welded to form an upper assembly → the steel cylinder is welded with the wear-resistant steel bar to complete the cylinder body → the cutting edge ring and the cutter head are welded to form the annular cutter head → the upper assembly, the cylinder body and the annular cutter head are welded and assembled to complete the whole drill.
The working process is as follows:
the drill hole repairing process by utilizing the drill bit of the invention comprises the following steps: positioning a drilling machine → assembling the drilling machine, a drill rod and a drill bit → drilling and coring section by section till the lower part of the cross section of the defective pile → clearing holes and finishing → pouring concrete again. (when there is a fault face of groundwater intrusion into the turn-around defect, water stopping measures must be taken into account in advance). Compared with the prior art, the drill bit keeps the inner and outer annular concrete protective layers of the main reinforcement cage protected in the rotating process; secondly, in the maintenance process, the soil around the pile is not interfered, and the side friction resistance is not influenced. The improvement of the two aspects leads to the remarkable improvement of the resource and the economic benefit. In addition, the drill bit outer sleeve wall is provided with the strip-shaped wear-resistant steel bars, the roughness of the inner wall of the pile is formed immediately in the drilling process, and the construction method is more energy-saving and environment-friendly.
The technical means disclosed by the scheme of the invention are not limited to the technical means disclosed by the technical means, and also comprise the technical scheme formed by equivalent replacement of the technical features. The present invention is not limited to the details given herein, but is within the ordinary knowledge of those skilled in the art.
Claims (8)
1. A core bit for repairing and processing a defective pile of a concrete cast-in-situ bored pile comprises an upper connecting assembly, a middle barrel body and an annular cutter head, wherein the upper connecting assembly, the middle barrel body and the annular cutter head are sequentially welded together; the method is characterized in that: a group of parallel wear-resistant strips are arranged on the middle cylinder body; the annular tool bit comprises a cutting edge ring, a group of tool bit bodies are arranged on the cutting edge ring along the circumferential direction, and the installation angles of the tool bit bodies are installed at equal intervals according to four angles of outwards-10 degrees, outwards-5 degrees, 0 degrees and inwards-5 degrees by taking the cutting edge ring plane as a reference.
2. The core bit for repairing and processing the defective pile of the concrete cast-in-situ bored pile according to claim 1, wherein: the upper portion connecting assembly comprises an upper disc plate, a square head is installed at the center of the upper disc plate, a square hoop is arranged outside the square head, and a supporting angle plate is welded between the square head and the upper disc plate.
3. The core bit for repairing and processing the defective pile of the concrete cast-in-situ bored pile according to claim 2, wherein: the lower surface of the upper plate is a rough surface.
4. The core bit for repairing and processing the defective pile of the concrete cast-in-situ bored pile according to claim 1, wherein: the middle barrel body comprises a steel barrel, the upper plate is welded to the upper portion of the steel barrel, the annular cutter head is welded to the lower portion of the steel barrel, and the wear-resistant strips are welded to the outer wall of the barrel body of the steel barrel.
5. The core bit for repairing the defective pile of the concrete cast-in-situ pile according to claim 1, 2 or 3, wherein: the installation inclination angle of the wear-resistant strips on the outer wall of the steel cylinder is 20 degrees.
6. The core bit for repairing and processing the defective pile of the concrete cast-in-situ bored pile according to claim 1, wherein: the wear-resistant strips are 8 in total, and are arranged in 1/4 areas of the outer wall of the steel cylinder symmetrically, the vertical projection length of each wear-resistant strip is no more than the outer perimeter of the steel cylinder 1/4, the strip interval is 1/4 steel cylinder height, and the width of each wear-resistant strip is less than the maximum mounting angle of the cutter head body.
7. The core bit for repairing and processing the defective pile of the concrete cast-in-situ bored pile according to claim 1, wherein: the diameter of the upper disc plate is equal to the inner diameter of the steel cylinder, and the overall outer diameter of the cutting edge ring mounting tool bit is equal to the diameter of a core concrete column to be repaired of the defective pile.
8. The core bit for repairing and processing the defective pile of the concrete cast-in-situ bored pile according to claim 1, wherein: the overall height of the upper disc plate, the steel cylinder and the edge ring is 1200 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010054031.0A CN111550190A (en) | 2020-01-17 | 2020-01-17 | Core bit is got in concrete drilling bored concrete pile defective pile restoration processing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010054031.0A CN111550190A (en) | 2020-01-17 | 2020-01-17 | Core bit is got in concrete drilling bored concrete pile defective pile restoration processing |
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| CN111550190A true CN111550190A (en) | 2020-08-18 |
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| CN202010054031.0A Pending CN111550190A (en) | 2020-01-17 | 2020-01-17 | Core bit is got in concrete drilling bored concrete pile defective pile restoration processing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112033734A (en) * | 2020-09-16 | 2020-12-04 | 贵州工程应用技术学院 | High-precision in-service concrete strength rapid detection equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201253916Y (en) * | 2008-05-08 | 2009-06-10 | 马若飞 | Core extraction drilling bit |
| CN201738814U (en) * | 2010-06-25 | 2011-02-09 | 北京探矿工程研究所 | Inner spiral cylinder type combined rock drilling tool |
| CN201943581U (en) * | 2010-12-24 | 2011-08-24 | 北京市三一重机有限公司 | Inner spiral drum-type boring tool |
| CN107090831A (en) * | 2017-05-05 | 2017-08-25 | 上海易谦岩土工程有限公司 | The clear stake drill bit of rotary digging formula |
| CN206801511U (en) * | 2017-06-22 | 2017-12-26 | 河南省水利勘测有限公司 | Suitable for the geology coring bit of loose boulder bed |
| CN212359631U (en) * | 2020-01-17 | 2021-01-15 | 润盛建设集团有限公司 | Core bit is got in concrete drilling bored concrete pile defective pile restoration processing |
-
2020
- 2020-01-17 CN CN202010054031.0A patent/CN111550190A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201253916Y (en) * | 2008-05-08 | 2009-06-10 | 马若飞 | Core extraction drilling bit |
| CN201738814U (en) * | 2010-06-25 | 2011-02-09 | 北京探矿工程研究所 | Inner spiral cylinder type combined rock drilling tool |
| CN201943581U (en) * | 2010-12-24 | 2011-08-24 | 北京市三一重机有限公司 | Inner spiral drum-type boring tool |
| CN107090831A (en) * | 2017-05-05 | 2017-08-25 | 上海易谦岩土工程有限公司 | The clear stake drill bit of rotary digging formula |
| CN206801511U (en) * | 2017-06-22 | 2017-12-26 | 河南省水利勘测有限公司 | Suitable for the geology coring bit of loose boulder bed |
| CN212359631U (en) * | 2020-01-17 | 2021-01-15 | 润盛建设集团有限公司 | Core bit is got in concrete drilling bored concrete pile defective pile restoration processing |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112033734A (en) * | 2020-09-16 | 2020-12-04 | 贵州工程应用技术学院 | High-precision in-service concrete strength rapid detection equipment |
| CN112033734B (en) * | 2020-09-16 | 2023-08-18 | 贵州工程应用技术学院 | High-precision in-service concrete strength rapid detection equipment |
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