CN215804381U - Drill bit system of large-diameter pile foundation of composite stratum - Google Patents
Drill bit system of large-diameter pile foundation of composite stratum Download PDFInfo
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- CN215804381U CN215804381U CN202122297027.XU CN202122297027U CN215804381U CN 215804381 U CN215804381 U CN 215804381U CN 202122297027 U CN202122297027 U CN 202122297027U CN 215804381 U CN215804381 U CN 215804381U
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Abstract
The utility model relates to a drill bit system of a large-diameter pile foundation of a composite stratum, which comprises a barrel drill and a slag salvaging drill, wherein the barrel drill and the slag salvaging drill are respectively connected with a connector connected with a drill rod, a plurality of drill teeth are arranged on the edge of an opening below the barrel drill, a spiral rib is arranged on the outer edge of the barrel drill, the number of turns of the spiral rib around the outer edge of the barrel drill is at least two, and the spiral rib protrudes out of the outer edge of the barrel drill by 25-35 mm. By adopting the technical scheme, the drilling efficiency of the drill bit is improved, and the drill jamming phenomenon is reduced.
Description
Technical Field
The utility model relates to the technical field of drilling construction, in particular to a drill bit system for a large-diameter pile foundation of a composite stratum.
Background
The composite stratum is a combined stratum which is composed of two or more different stratums within the excavation section range of underground engineering and in the excavation extension direction, and features of the composite stratum such as geotechnical, engineering geology and hydrogeology are greatly different. When large-diameter pile foundation construction needs to be carried out on a composite stratum, rotary drilling is generally adopted for hole forming construction, scraper drill, barrel drill or hob drill is selected according to stratum conditions, and conventional procedures are that drilling is carried out by directly using a large-diameter barrel drill from hole opening.
The conventional rotary drilling hole forming construction process is adopted for large-diameter pile construction, the problems that a drill is blocked and a drill bit is easy to be bonded with mud cakes easily occur in the construction of a mudstone stratum region, and therefore the construction efficiency is low.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a drill bit system for a large-diameter pile foundation of a composite stratum, which can improve the working efficiency of a drill bit and solve the problem of drill sticking.
In order to realize the purpose, the utility model adopts the following technical scheme:
the utility model provides a drill bit system of compound stratum major diameter pile foundation, bores and drags for the sediment including a section of thick bamboo, a section of thick bamboo bore with drag for the sediment and bore the connector that is connected with the drilling rod respectively, the below opening border that a section of thick bamboo bored all is equipped with a plurality of brill teeth, the outer fringe that a section of thick bamboo bored is provided with the spiral rib, the spiral rib winds the outer fringe number of turns that a section of thick bamboo bored is two rings at least, the spiral rib protrusion the outer fringe 25 ~ 35mm that a section of thick bamboo bored.
By adopting the technical scheme, as the medium-weathering and slightly-weathering rock formations have larger proportion, the outer wall of the common barrel drill is easy to adhere to rock and soil in the rotating process, and the water absorption capacity of mud rock is stronger, the barrel drill and the hole wall are sealed to form a necking state, the drilling frictional resistance is increased, the drilling efficiency is reduced, even the drill jamming phenomenon occurs, the current situation that the mud rock is easy to adhere to the outer wall of the barrel drill is effectively improved by arranging the spiral rib at the outer edge of the barrel drill, and the drilling work efficiency is improved; simultaneously, the outer fringe number of turns that sets up spiral rib and bore around a section of thick bamboo is two rings at least, keeps the screw thread of the outer wall that a section of thick bamboo bored, reduces the adhesion of earth, prevents that a section of thick bamboo from drilling out the phenomenon of sticking the brill now.
The utility model is further configured to: the thickness of the spiral rib protruding the outer edge of the cylindrical drill is 30 mm.
Through adopting above-mentioned technical scheme, when the outer fringe that the spiral rib protrusion section of thick bamboo bored was too big, easily caused the error to the diameter of predetermineeing of pile foundation, influenced the accurate nature of pore-forming. When the spiral rib protrudes out of the outer edge of the cylindrical drill, the current situation that mud rocks are easily adhered to the outer wall of the cylindrical drill is difficult to effectively improve.
The utility model is further configured to: the outer edge bottom of the slag salvaging drill is provided with a plurality of reinforcing ribs arranged at intervals.
Through adopting above-mentioned technical scheme, in order to guarantee the rigidity and the intensity of dragging for the sediment brill blade angle, promote the fastness of dragging for the sediment brill.
The utility model is further configured to: the reinforcing ribs are arranged in a strip shape.
By adopting the technical scheme, the material is saved, and the manufacturing cost of the barrel drill is reduced.
The utility model is further configured to: the axial direction of the reinforcing ribs is consistent with the axial direction of the slag salvaging drill, and the plurality of reinforcing ribs are arranged in parallel.
Through adopting above-mentioned technical scheme, play even unanimous reinforcing action to the drill edge of dragging for the sediment brill, and saved the material of steel for traditional addding the beaded finish, the cost is reduced.
The utility model is further configured to: the length of the reinforcing rib is less than half of the height of the barrel of the slag removing drill.
Through adopting above-mentioned technical scheme, reduce the use to steel, reduce the manufacturing cost of drill bit.
The utility model is further configured to: the bottom opening of the slag removing drill is provided with a bottom plate, the bottom plate is provided with at least one cutting tooth plate used for gathering slag soil, the cutting tooth plate extends outwards from the rotating center of the bottom plate, and a plurality of cutting teeth protrude outwards from the cutting tooth plate.
Through adopting above-mentioned technical scheme, the bottom plate is equipped with at least one cutting toothed plate for the dregs can be to the centre gathering of cutting toothed plate, and better promotion dregs gets into drags for the sediment and bores, improves the sediment effect of advancing that drags for the sediment and bore.
The utility model is further configured to: the diameters of the slag salvaging drill and the barrel drill comprise 1400mm, 2000mm, 2500mm and 3000 mm.
Through adopting above-mentioned technical scheme, confirm hierarchical reaming progression according to the diameter of predetermineeing of pile foundation to carry out reaming step by step, rationally select the drill bit model, require the moment of torsion of drilling tool to maintain lower level.
Compared with the prior art, the utility model has the following advantages:
when the medium-weathering and slightly-weathering rock strata of the rock stratum have a large proportion, the outer wall of a common barrel drill is easy to adhere to rock and soil in the rotating process, and the water absorption capacity of mudstone is strong, the barrel drill and the hole wall are sealed to form a necking state, so that the frictional resistance of a drill hole is increased, the drilling efficiency is reduced, and even the phenomenon of drill sticking occurs, the current situation that the mudstone is easy to adhere to the outer wall of the barrel drill is effectively improved and the drilling work efficiency is improved by arranging spiral ribs on the outer edge of the barrel drill; simultaneously, the outer fringe number of turns that sets up spiral rib and bore around a section of thick bamboo is two rings at least, keeps the screw thread of the outer wall that a section of thick bamboo bored, reduces the adhesion of earth, prevents that a section of thick bamboo from drilling out the phenomenon of sticking the brill now.
Drawings
FIG. 1 is a schematic structural diagram of a barrel drill according to the present embodiment;
FIG. 2 is a schematic structural view of the slag removing drill of this embodiment
FIG. 3 is a schematic view of the drilling of the first section pile hole of the present embodiment;
FIG. 4 is a schematic diagram of the opening of the primary hole of the second section of pile hole according to the present embodiment;
FIG. 5 is a schematic diagram of the opening of the N-stage hole of the second section of pile hole according to the embodiment;
fig. 6 is a schematic view illustrating drilling of the primary pile hole of the third pile hole segment according to the embodiment;
FIG. 7 is a schematic illustration of slag removal of the primary pile hole of the third segment pile hole of the present embodiment;
fig. 8 is a schematic view illustrating drilling of N-stage holes of the third segment pile holes according to the embodiment;
fig. 9 is a slag removal schematic view of the N-stage pile hole of the third pile hole segment according to the embodiment.
Reference numerals: 1. barrel drilling; 2. a linker; 3. drilling teeth; 4. a spiral rib; 5. a slag removing drill; 6. a reinforcing rib; 7. a base plate; 8. a cutting pick.
Detailed Description
The present invention is further described with reference to the drawings and the exemplary embodiments, wherein like reference numerals are used to refer to like elements throughout. In addition, if a detailed description of the known art is not necessary to show the features of the present invention, it is omitted.
The embodiments are described in such detail as to enable those skilled in the art to practice the utility model without the need for inventive faculty. Embodiments may be one or more, as the case may be, to support the intended scope.
For the utility model of the product pair, the detailed description will be made with reference to the accompanying drawings to describe the mechanical structure of the product in detail, and to illustrate the interrelationship between the components, such as the connection relationship, the cooperation relationship, etc., and if necessary, the operation process or operation steps thereof. When the method is used, the process conditions are written except the steps.
As shown in fig. 1 and 2, a drill bit system of large-diameter pile foundation of composite stratum is disclosed, including a barrel drill 1 and a slag salvaging drill 5, the top of both barrel drill 1 and slag salvaging drill 5 is fixedly connected with connector 2 that is connected with the drilling rod respectively, wherein, barrel drill 1 plays the ground gyratory fragmentation in the pile foundation, the below opening border of barrel drill 1 has all welded a plurality of evenly distributed's brill tooth 3, the material of brill tooth 3 can be selected for carbide, barrel drill 1 drill bit is the setting of cavity tubbiness, the lateral wall of barrel drill 1 has been offered respectively and is used for the drainage hole of outwards discharging gas and water, the height of barrel drill 1 can be selected according to the degree of depth that needs bore, the width of barrel drill 1 can be selected according to the diameter of predetermineeing of pile foundation and hierarchical reaming number of times.
The outer fringe fixedly connected with spiral rib 4 of barrel drill 1, spiral rib 4 is two circles at least around the outer fringe number of turns of barrel drill 1, and spiral rib 4 protrusion barrel drill 1's outer fringe 25 ~ 35mm, and spiral rib 4 adopts the steel sheet welding to make.
Preferably, the outer edge δ of the projection of the spiral rib of the barrel drill is 30 mm.
The slag removing drill 5 is used for loading crushed rock and soil of the barrel drill 1 into the bucket and discharging the crushed rock and soil, the crushed rock and soil are arranged in a hollow barrel shape, a bottom opening of the slag removing drill 5 is movably connected with a bottom plate 7, the bottom plate 7 can rotate along the center of the bottom opening of the barrel drill 1, a slag inlet is formed in the bottom plate 7, and slag soil passes through the bottom plate 7 from the slag inlet so as to enter an inner cavity of the slag removing drill 5.
Bottom fixedly connected with of bottom plate 7 has at least one pick 8 board, and the pick 8 board outwards extends from the centre of rotation of bottom plate 7, plays the promotion effect to the dregs, and the below of pick 8 board is outwards outstanding to have a plurality of even picks 8 of establishing of dividing, and wherein pick 8 plays the effect of destroying the soil layer, plays the effect of certain promotion dregs simultaneously.
The welding of drag for the outer fringe bottom of sediment brill 5 has the enhancement rib 6 that a plurality of intervals set up, and the axial direction of strengthening rib 6 is unanimous with the axial direction who drags for sediment brill 5, and a plurality of mutual parallel arrangement between the rib 6 of strengthening, the length of strengthening rib 6 is less than the half of the barrel height of dragging for sediment brill 5.
The diameters of the slag removing drill 5 and the barrel drill 1 comprise 1400mm, 2000mm, 2500mm and 3000 mm.
The construction method of the drill bit system comprises the following steps:
s1, preparing in the early stage of construction, drilling the geology of the preset position in advance, knowing the stratum condition of the preset position, and determining the pile position center of the pile foundation.
And S2, constructing the steel pile casing, and embedding the steel pile casing by aligning the center of the pile position.
And S3, as shown in figure 2, before rock entering construction, the rotary excavation drilling machine is provided with a slag salvaging drill 5 drill bit, and a first section of pile hole is drilled in a soil layer of a preset pile foundation.
S4, as shown in figures 3 and 4, before rock entering construction, when the strength of the current rock stratum is confirmed to be lower than a preset value, drilling a second section of pile hole by using the slag removing drill 5 in a gradual hole expanding mode, wherein the diameter of a drill bit adopted by the next drilling is 0.5-0.6m larger than that of the drill bit adopted by the previous drilling;
and S5, as shown in the figures 5 and 6, when the strength of the current rock stratum is determined to be higher than the preset value, drilling a third section of pile hole by alternately using the barrel drill 1 and the slag removing drill 5 in a gradual hole expanding mode, wherein the diameter of the drill bit adopted in the next drilling is 0.5-0.6m larger than that of the drill bit adopted in the previous drilling.
And S6, after the construction of the pile foundation is completed, carrying out hole forming inspection on the pile foundation.
S7, placing the reinforcement cage, and hoisting the assembled reinforcement cage into the pile foundation.
S8, pouring concrete, namely installing a guide pipe platform at the top of the steel casing, lowering the guide pipe, adjusting the guide pipe to the central position of the steel reinforcement cage, and pouring the concrete into the steel reinforcement cage through the guide pipe until the concrete is poured to the corresponding designed elevation.
Optionally, in S1, the specific steps include:
the method comprises the steps of performing advanced drilling on a construction soil layer according to a construction drawing, knowing the distribution condition of various soil qualities of a pile position according to the advanced drilling, measuring the weathering coefficient of a composite stratum, analyzing to obtain an advanced drilling report and a construction period requirement, further determining the drilling depth required by a strongly weathered rock stratum and the drilling depth required by a medium and slightly weathered rock stratum, and constructing the composite stratum by using a total station, a hole detector, a rotary drilling rig and a drill bit, wherein the drill bit comprises a barrel drill 1 and a slag salvaging drill 5.
Determining the center of a pile position, measuring and lofting the preset position of the pile foundation, emitting 4 control points which are arranged in a cross shape around the pile position of the pile foundation by adopting a total station, measuring intersection points of cross lines by adopting the total station, rechecking the center line coordinates of the pile, determining the center of the pile position of the pile foundation by adopting the total station and marking.
Another embodiment is to measure and loft the preset pile foundation position, mark the pile position center by using a cross method, and then mark the outer contour of the pile and mark the pile position center by using a solid line.
Optionally, in S2, the specific steps include:
according to the pile position center result obtained in the S1, hoisting the steel pile casing to the designed hole position, firstly lowering the steel pile casing and fixing the steel pile casing, wherein the top surface of the steel pile casing is higher than the top surface of the drilling platform by a certain height, the steel pile casing sinks by adopting a vibration hammer to vibrate, and the vibration hammer sinks the steel pile casing by vibration; because the basement bottom is the geology after the stone blasting excavation, the basement geology is a strongly weathered rock stratum, and the strength is lower; and after the steel protection cylinder does not sink any more, drilling by adopting the rotary drilling rig, and continuously vibrating, sinking and following the steel protection cylinder in the drilling process of the rotary drilling rig.
Optionally, in S3, the forming of the holes specifically includes the following steps:
first section stake hole creeps into the pore-forming through dragging for the sediment and bore 5 drill bits, and the diameter in first section stake hole equals the setting with the diameter value of predetermineeing the stake hole, and first section stake hole directly adopts and creeps 5 one step of pore-forming with dragging for the sediment of predetermineeing stake hole isodiametric.
In another embodiment, a first section of pile hole is drilled in a soil layer of a preset pile foundation in a gradual hole expansion mode, the drill bit is selected as the slag fishing drill 5, and the diameter of the slag fishing drill 5 adopted in the next drilling is 0.5-0.6m larger than the diameter of the slag fishing drill 5 adopted in the previous drilling until the diameter of the drilled first section of pile hole is equal to the preset diameter of the pile foundation.
Optionally, in S4, the specific steps include:
as shown in fig. 3 and 4, the preset value includes a weathering coefficient, wherein the weathering coefficient is set to 0.4, the numerical value of the stratum is compared with the preset value, the weathering degree of the rock stratum is determined, and then the drilling mode is determined, when the strength of the current rock stratum is determined to be lower than the preset value, the weathering degree of the current rock stratum is relatively serious, the rock stratum can be determined to be a strongly weathered or fully weathered rock stratum, namely the rock stratum is divided into blocky or scattered rock strata by jointed cracks, most of the rock stratum structure is damaged, the structural layer is unclear, even broken stones of the rock stratum can be crushed by hands, therefore, the strength and the water absorption capacity of the current rock stratum are relatively weak, the drilling can be completed by directly adopting a slag removing drill 5 without adopting a barrel drill 1 for drilling the current rock stratum, the slag removing can be performed on pile holes synchronously, and the hole forming efficiency is improved. And then, determining the stage number of the graded reaming according to the preset diameter value of the pile hole, drilling a primary hole in the pile position by using a slag removing drill 5, wherein the diameter of the primary hole is smaller than the diameter value of the preset pile hole, gradually increasing the diameter of the pile hole until the diameter of the N-stage hole is equal to the preset diameter of the pile foundation, and the hole depth of each stage of pile hole is the same.
Specifically, when the diameter value of the preset pile hole is 3000mm, drilling construction is carried out according to four stages of the diameter value of the preset pile hole, the slag salvaging drills 5 respectively select drill bits with the diameters of 1400mm, 2000mm, 2500mm and 3000mm, the slag salvaging drill 5 drill bit with the diameter of 1400mm is installed on the rotary excavating machine, the strongly weathered rock stratum is drilled to the preset depth, a first-stage hole is drilled, then, the strongly weathered rock stratum is reamed sequentially through the slag salvaging drill 5 drill bits with the diameters of 2000mm, 2500mm and 3000mm on the basis of the same depth as the first-stage hole, and the second-stage pile hole with the diameter of 3000mm is drilled.
Optionally, in S5, the specific steps include:
as shown in fig. 5 and 6, the preset values include a weathering factor, wherein the weathering factor is set to 0.4, the value of the formation is compared with the preset values, the degree of weathering of the formation is determined, further determining the drilling mode, when the strength of the current rock stratum is higher than the preset value, indicating that the current rock stratum is low in weathering degree, the tissue structure of the rock stratum is not obviously damaged, and the rock stratum still has strong water absorption capacity, its stratum intensity is stronger, need adopt barrel drill 1 to bore and get current stratum, utilize barrel drill 1 to bore at the pile position and establish the one-level hole, reuse drags for sediment and bores 5 and carry out the scarfing cinder to the one-level hole, later step by step through barrel drill 1 and drags for sediment and bore 5 mode reaming scarfing cinder in turn, diameter and the diameter value of presetting the pile hole in N level hole equal the setting, bore the barrel drill 1 that establishes the foundation hole of same one-level and drag for sediment 5 sizes between them unanimous, it establishes the homogeneous phase with setting up between the hole depth of the foundation hole of different levels to bore.
As shown in fig. 7, 8 and 9, specifically, when the diameter value of the preset pile hole is 3000mm, drilling construction is performed in four stages according to the diameter value of the preset pile hole, drill bits with diameters of 1400mm, 2000mm, 2500mm and 3000mm are respectively selected for the barrel drill 1 and the slag removing drill 5, the barrel drill 1 with the diameter of 1400mm is firstly installed on the rotary drilling machine to drill the rock stratum with the weathering coefficient larger than 0.4 to the designed depth, the drill bit of the barrel drill 1 is lifted up from the hole bottom of the opened primary hole, the slag removing drill 5 with the same diameter is replaced on the rotary drilling machine, the slag removing drill 5 is lowered to perform slag removing treatment on the primary hole, the slag soil generated in the process of opening the primary hole is discharged to facilitate subsequent hole expanding of an operator, and then the alternative mode of the barrel drill 1 and the slag removing drill 5 is continuously adopted for hole expanding and slag removing, wherein the drill bits are used in the order of 2000mm barrel drill 1, 2000mm slag removing drill 5, 2500mm barrel drill 1 and slag removing drill 5, A slag removing drill 5 with the thickness of 2500mm, a barrel drill 1 with the thickness of 3000mm and a slag removing drill 5 with the thickness of 3000mm till the diameter of a four-stage hole reaches 3000 mm.
One embodiment of the method is that when the diameter value of the preset pile hole is 3000mm, the pore-forming diameter of the first section pile hole is larger than 3000mm, the pore-forming diameter of the second section pile hole is larger than 3000mm, and the pore-forming diameter of the second section pile hole is smaller than that of the first section pile hole, the drilling is continued downwards on the basis of the second section pile hole until the diameter of the Nth section pile hole is 3000mm, namely the diameter of the first section pile hole, the diameter of the second section pile hole to the Nth section pile hole is gradually reduced until the diameter of the Nth section pile hole is equal to the diameter value of the preset pile hole, so that the set pile foundation is firmer.
Another embodiment is to drill the preset pile foundation longitudinally and sectionally, namely, firstly, drilling a first section of pile hole with the depth of m1 on the soil layer of the preset pile foundation, wherein the depth m1 of the first section of pile hole is less than the depth of the preset pile hole, the diameter of the first section of pile hole is less than the diameter value of the preset pile hole, the second section of pile hole is reamed on the basis of the first section of pile hole, the diameter of a drill bit adopted in the next drilling is 0.5-0.6m greater than the diameter of the drill bit adopted in the previous drilling, and the pile hole is continuously dug with the depth of m2 on the basis of m1, the sum of m1 and m2 is less than the depth of the preset pile hole, the pile hole in the third section is reamed on the basis of the second section of pile hole, and the pile hole continues to dig with the depth m3 on the basis of m1 and m2 until the depth of the pile hole in the N section (m1+ m2+ 3 + m3. + mn) is equal to the depth of the preset pile hole, and the diameter value of the pile hole is equal to the diameter value of the preset pile hole, and finishing drilling the preset pile foundation.
Optionally, in S6, the step of detecting the hole formation of the pile foundation includes:
the method comprises the following steps of (1) using a hole detector to detect the inclination, hole position and hole diameter of a pile foundation, wherein when the hole detector detects the inclination, the hole detector is placed at the bottom of the pile foundation, the horizontal distance between a steel wire rope for hoisting the hole detector and the center of the pile position is measured in the transverse bridge direction and the forward bridge direction, and the horizontal distance value is divided by the hole depth to obtain the inclination;
when the hole detector detects a hole position, the hole detector is put down to the bottom opening of the protective cylinder, and the horizontal distance between a steel wire rope for hanging the hole detector and the center of the pile position is measured from the transverse bridge direction and the forward bridge direction to obtain deviation;
when the hole detector is used for detecting the hole diameter, the hole detector with the diameter the same as the designed pile diameter and the length 4-5 times of the designed pile diameter is adopted, and when the hole detector is smoothly put to the bottom of the hole of the pile foundation, the hole diameter is qualified.
Optionally, in S7, the specific steps include:
when the reinforcement cage is installed, multi-point hoisting is adopted. The hoisting points can be arranged at the lower part, the middle part or the middle upper part of the steel reinforcement cage, and measures are taken to strengthen the structural strength of the hoisting points so as to ensure that the steel reinforcement cage is not deformed during hoisting; coping accurate aperture when hanging steel reinforcement cage and getting into the pile foundation keeps steel reinforcement cage's the perpendicular setting of axial direction, slowly transfers after steel reinforcement cage gets into the pile foundation gradually, and steel reinforcement cage center puts with design stake central point and adjusts well to with steel reinforcement cage welding positioning on the steel protects a section of thick bamboo, accomplish steel reinforcement cage's installation.
In summary, the cofferdam system and the construction method thereof provided by the application have the following beneficial effects:
when the medium-weathering and slightly-weathering rock strata of the rock stratum have a large proportion, the outer wall of the common barrel drill 1 is easy to adhere to rock and soil in the rotating process, and the water absorption capacity of the mudstone is strong, the barrel drill 1 and the hole wall are sealed to form a necking state, so that the drilling frictional resistance is increased, the drilling efficiency is reduced, and even the drill jamming phenomenon occurs, the current situation that the mudstone is easy to adhere to the outer wall of the barrel drill is effectively improved and the drilling work efficiency is improved by arranging the spiral rib 4 at the outer edge of the barrel drill 1; simultaneously, set up spiral rib 4 and bore 1 around the section of thick bamboo the outer fringe number of turns for two rings at least, keep the screw thread of 1 outer wall of section of thick bamboo brill, reduce the adhesion of earth, prevent that a section of thick bamboo from drilling out the phenomenon of sticking the brill now.
When the first, second and third sections of pile holes are drilled, the same set of drill bit can be adapted to the complex construction environment of the composite stratum, the problem of drill sticking easily occurring in medium and breezy terranes during construction is solved, the working efficiency of drilling is improved, the problem that the requirement on the torque of drilling equipment in strong-weathering and completely-weathering terranes during construction is too high is solved, the adaptability of the same set of drill bit is improved, and the drilling cost of the composite stratum is reduced.
Although a few exemplary embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these exemplary embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the claims and their equivalents.
Claims (8)
1. The utility model provides a drill bit system of compound stratum major diameter pile foundation, its characterized in that, bores (5) including a barrel drill (1) and drags for the sediment, barrel drill (1) with drag for the sediment and bore (5) and be connected with connector (2) that are connected with the drilling rod respectively, the below opening border of barrel drill (1) all is equipped with a plurality of brill teeth (3), the outer fringe of barrel drill (1) is provided with spiral rib (4), spiral rib (4) wind the outer fringe number of turns of barrel drill (1) is two rings at least, spiral rib (4) protrusion the outer fringe 25 ~ 35mm of barrel drill (1).
2. A drill bit system for large-diameter pile foundations in composite strata according to claim 1, characterized in that the thickness of the spiral rib (4) protruding out of the outer edge of the barrel drill (1) is 30 mm.
3. A drill bit system for a large-diameter pile foundation in a composite stratum according to claim 1, characterized in that the bottom end of the outer edge of the slag removing drill (5) is provided with a plurality of reinforcing ribs (6) arranged at intervals.
4. A drill bit system for large-diameter pile foundations in composite ground layers according to claim 3, characterized in that the reinforcing ribs (6) are in the shape of strips.
5. A drill bit system for a large-diameter pile foundation in a composite stratum according to claim 4, characterized in that the axial direction of the reinforcing ribs (6) is consistent with the axial direction of the slag removing drill (5), and a plurality of reinforcing ribs (6) are arranged in parallel.
6. A drill bit system for large-diameter pile foundations in composite ground layers according to claim 3, characterized in that the length of the reinforcing ribs (6) is less than half the barrel height of the slag removing drill (5).
7. The drill bit system for the large-diameter pile foundation of the composite stratum as claimed in claim 3, wherein the bottom opening of the slag removing drill (5) is provided with a bottom plate (7), the bottom plate (7) is provided with at least one cutting pick (8) plate for gathering slag, the cutting pick (8) plate extends outwards from the rotation center of the bottom plate (7), and a plurality of cutting picks (8) protrude outwards from the cutting pick (8) plate.
8. A drill bit system for large diameter pile foundations of composite formation as claimed in claim 1 wherein the diameters of both the drag bit (5) and the barrel drill (1) include 1400mm, 2000mm, 2500mm and 3000 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122297027.XU CN215804381U (en) | 2021-09-22 | 2021-09-22 | Drill bit system of large-diameter pile foundation of composite stratum |
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| CN202122297027.XU CN215804381U (en) | 2021-09-22 | 2021-09-22 | Drill bit system of large-diameter pile foundation of composite stratum |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113931572A (en) * | 2021-09-22 | 2022-01-14 | 中交路桥华南工程有限公司 | Construction method of large-diameter pile foundation of composite stratum and drill bit system |
| CN114541970A (en) * | 2022-04-25 | 2022-05-27 | 海门市重型矿山机械厂 | Self-adaptive drilling equipment for geotechnical surveying |
-
2021
- 2021-09-22 CN CN202122297027.XU patent/CN215804381U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113931572A (en) * | 2021-09-22 | 2022-01-14 | 中交路桥华南工程有限公司 | Construction method of large-diameter pile foundation of composite stratum and drill bit system |
| CN113931572B (en) * | 2021-09-22 | 2024-01-19 | 中交路桥华南工程有限公司 | Construction method of large-diameter pile foundation of composite stratum and drill bit system |
| CN114541970A (en) * | 2022-04-25 | 2022-05-27 | 海门市重型矿山机械厂 | Self-adaptive drilling equipment for geotechnical surveying |
| CN114541970B (en) * | 2022-04-25 | 2022-07-22 | 海门市重型矿山机械厂 | Self-adaptive drilling equipment for geotechnical survey |
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