CN205154037U - Drill bit that construction drilling bored concrete pile was used - Google Patents
Drill bit that construction drilling bored concrete pile was used Download PDFInfo
- Publication number
- CN205154037U CN205154037U CN201520881619.8U CN201520881619U CN205154037U CN 205154037 U CN205154037 U CN 205154037U CN 201520881619 U CN201520881619 U CN 201520881619U CN 205154037 U CN205154037 U CN 205154037U
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- cleaning shoe
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Abstract
The utility model discloses a drill bit that construction drilling bored concrete pile was used, it includes base rod (1), drill tip (2), retaining ring (3), connecting plate (4) and scraper (5), all weld on base rod (1) the inner of polylith connecting plate (4) and all weld with retaining ring (3) the outer end, scraper (5) lower extreme is upper end and connecting plate (4) welding with base rod (1) welding, this drill bit still is equipped with scrapes mud subassembly and removable guarantor's muscle piece, scrapes the mud subassembly and includes cleaning shoe (8) and mounting panel (9), and mounting panel (9) welding is at the inner circumference of retaining ring (3), and cleaning shoe (8) outside is equipped with steel brush (17), cleaning shoe (8) through first draw -in groove (10) hook on retaining ring (3), installation department (8.1) of cleaning shoe (8) are fixed with mounting panel (9) spiro union of both sides. This drill bit and construction method can effectively be bored and fallen to protect the sand body between a section of thick bamboo and the stake hole.
Description
Technical field
The utility model relates to pile foundation construction field, is specifically a kind of drill bit of construction drill castinplace pile.
Background technology
Concrete drilling bored concrete pile reaches hundred meters and then decrease the advantages such as a quantity because high, the strong adaptability of bearing capacity, stake are long, become domestic and international building particularly large-scale building as the base form of bridge, oil tank, liquified natural gas tank, nuclear power station first-selection.Concrete drilling bored concrete pile main construction course has: pore-forming, descending reinforcing cage, filling concrete.In above-mentioned main construction course, pore-forming is key link.In pore forming process, three wings scraper type drill bit is normally adopted to creep on stratum.
As shown in Figure 1, the three wings scraper type drill bit of prior art comprises the basic rod 101 of hollow, apex point 102, back-up ring 103, three pieces of junction plates 104 and three pieces of scrapers 105; Basic rod 101 top is provided with the connecting portion 106 for being connected with the drilling rod of rig, and specifically, the drilling rod of rig establishes the basic rod 101 of pin thread and drill bit to establish box, and both male and females coordinate tightens connection, described connecting portion 106 i.e. box; Apex point 102 is welded on basic rod 101 lower end, the inners of three pieces of junction plates 104 to be all welded on basic rod 101 and to be uniformly distributed along basic rod 101 circumference, the outer end of three pieces of junction plates 104 is all welded with the inner peripheral surface of back-up ring 103, every block scraper 105 and one piece of junction plate 104 are one group, every block scraper 105 lower end is welded with basic rod 101 and upper end is welded with that block junction plate 104 organized, the dual-side of apex point 102 lower end is welded with alloy cutting tooth 107, and the side of every block scraper 105 is also welded with alloy cutting tooth 107.During bit bore, the alloy cutting tooth 107 on apex point 102 and scraper 105 is for cutting the soil body.The outer circumference surface of back-up ring 103 is also provided with multiple guarantor's muscle blocks 108 of perpendicular row arrangement.When with the apex point 102 of drill bit and scraper 105 drilling and forming hole, the effect of back-up ring 103 provides support hole wall, to prevent collapse hole, but the outer circumference surface of back-up ring 103 is continuous and hole wall friction will certainly cause wearing and tearing, so weld multiple guarantor's muscle block 108 in order to the outer circumference surface of back-up ring 103 and hole wall to be separated, back-up ring 103 is avoided to wear and tear.
In the three wings scraper type drill bit pore forming process using prior art, when run into top as banketed, mud, layer of sand etc. loose easily collapse stratum time, have employed mud off although creep into simultaneously, but due to reasons such as mud property, drilling technology, complex formation and seepage action of ground waters, easy generation is collapsed hole, result cause pile bottom sediment too much affect pile capacity, drill bit and rig by fallen in come sand bury, reinforcing cage cannot be transferred smoothly, affect the series of problems such as pile quality, thus have impact on construction speed, add construction cost.In practice, in order to prevent the generation of above-mentioned accident, conventional hydraulic vibration driver sinks to the casing being greater than design stake diameter in stratum, then creeps into, lower than the stratum collapsed that easily collapses bottom this casing, causes casing to reach more than ten meter, even tens meters; Descending reinforcing cage after pore-forming; Fill with concrete; Casing is last or stay in the earth formation, or is pulled out before concrete initial set.
But, although sink to, casing is favourable to creep into, but in the altitude range of casing, this part sand body between casing and stake holes still may cave in, still there is sediment, bury drill bit and drilling rod, reinforcing cage cannot be transferred smoothly, affect the series of problems such as pile quality, in order to thoroughly effect a radical cure above-mentioned drawback, someone proposes and imagines by the technology of the drill bit of small one and large one two sizes, namely first with the macropore that large drill bit coincide at casing height drill diameter and casing internal diameter, then with the little bit drills aperture identical with bored pile intended diameter.But the actual operability of above-mentioned imagination is not strong, this is because, each construction needs preparation two kinds of drill bits, increases construction cost, and, need to mention on drill bit outside hole at every turn, more whole drill bit is backed out rear replacing green bit from rig, the overall weight of drill bit is inherently not light, and it is heavier after having glued mud, Renewal process is made to bother effort, very inconvenient, delay the course of work further, therefore no matter from time cost and financial cost, all lose more than gain.And; also there is a defect in this technical scheme; although the protectiveness of protecting muscle block avoids the wearing and tearing of back-up ring; but guarantor's muscle block and the hole wall soil body constantly rub and also can be worn; once protect after the wearing and tearing of muscle block scrap; can only be cut away the upper new guarantor's muscle block of welding again, its cumbersome is required great effort, and the damage of Rewelding to back-up ring is larger.
Utility model content
The technical problems to be solved in the utility model is, there is provided a kind of when using casing to creep into banketing, in the loose stratum that easily collapses such as mud, layer of sand, effectively can bore sand body between casing and stake holes and time cost and financial cost, convenient to operation laborsaving and change and protect the simple and convenient drill bit to the undamaged construction drill castinplace pile of back-up ring of muscle block can not be increased considerably.
Technical solution of the present utility model is, provides a kind of drill bit of construction drill castinplace pile, and it comprises the basic rod of hollow, apex point, back-up ring, polylith junction plate and scraper the same number of with junction plate; Basic rod top is provided with connecting portion; The inner of polylith junction plate to be all welded on basic rod and to be uniformly distributed along basic rod circumference, and the outer end of polylith junction plate is all welded with the inner peripheral surface of back-up ring; Every block scraper and one piece of junction plate are one group, and every block scraper lower end is welded with basic rod and upper end is welded with that block junction plate organized; Apex point is welded on basic rod lower end;
This drill bit is also provided with removablely scrapes mud assembly, each mud assembly of scraping comprises one piece of cleaning shoe and two pieces of installing plates, installing plate is welded on the inner peripheral surface of back-up ring, installing plate is provided with screw via hole, cleaning shoe is provided with the first draw-in groove that Open Side Down, the cleaning shoe part be positioned at inside the first draw-in groove is installation portion, cleaning shoe is positioned at part outside the first draw-in groove for scraping mud portion, installation portion is also provided with screw via hole, scrape outside mud portion and be provided with steel brush, cleaning shoe is hooked on back-up ring through the first draw-in groove, the installation position of cleaning shoe is between two pieces of installing plates with group, the installation portion of cleaning shoe and the installing plate of both sides are spirally connected fixing,
This drill bit also comprises removable polylith and protects muscle block, every block protect that muscle block is provided with that Open Side Down for the second draw-in groove with back-up ring hook, protecting the muscle block part be positioned at inside the second draw-in groove is spiro union portion, protect muscle block and be positioned at part outside the second draw-in groove for protecting muscle portion, two surfaces protecting muscle portion are all welded with stiffener, and spiro union portion is also provided with screw via hole.
Utilize the construction method of drill bit of the present utility model, its step comprises:
A, with hydraulic vibration driver, casing is sunk to the projected depth on stratum;
B, the two pieces of installing plates every group being scraped mud assembly are welded on the inner peripheral surface of the back-up ring of drill bit, first draw-in groove of cleaning shoe to be hooked on back-up ring and to make the installation position of cleaning shoe between two pieces of installing plates with group, and the installing plate of this installation portion and both sides is spirally connected fixing;
C, drill bit is arranged on the drilling rod of rig;
D, to creep into downwards, until the cleaning shoe of drill bit arrives bottom casing;
E, on carry drill bit, lay down the cleaning shoe scraping mud assembly;
F, the second draw-in groove protecting muscle block be hooked on back-up ring and make the spiro union portion protecting muscle block between two pieces of installing plates that a group is scraped mud assembly, and the installing plate of this spiro union portion and both sides is spirally connected fixing;
G, continuation are crept into downwards, until drill bit arrives stake projected depth;
Reinforcing cage is transferred again in h, clear hole, and concrete perfusion.
The drill bit adopting the construction drill castinplace pile of above structure compared with prior art, has the following advantages.
First, after fit on cleaning shoe, distance between the outward flange of cleaning shoe steel brush and basic rod axis is the half of casing internal diameter, like this, the macropore coincide with casing size can be got out first during lower brill, thoroughly the sand body in casing is scraped totally, and then stopped follow-up sediment, bury drill bit and drilling rod, reinforcing cage cannot be transferred smoothly, affect the series of problems such as pile quality; And this technical scheme, without the need to preparing the different drill bit of two sizes as prior art, economically reduces the cost of construction naturally; Moreover, this technical scheme only needs lighter cleaning shoe to dismantle from drill bit, without the need to being backed out by the drilling rod of heavier solid drill from rig as prior art, and then changes heavier integral (drill) bit, therefore work progress is quick, convenient, laborsaving, saves time cost; And back-up ring and hole wall can separate by the existence protecting muscle block, back-up ring is effectively avoided to wear and tear.
More valuable is, also there are two technical bright spots in the utility model, one is the removable concrete structure be connected of cleaning shoe and back-up ring in the technical program, this connected mode structure is simple, be only the cleaning shoe of two installing plates and band the first draw-in groove, easy to assembly, only need by cleaning shoe hook screw lock again, unloading process is simple too; All right recycled for multiple times, economy might as well; Moreover, once install fixing after, cleaning shoe be also combined firmly with back-up ring, intensity reliably, can not get loose when guaranteeing to scrape mud.Take the mode contrasted more can understand the advantage of this syndeton, if do not adopt above-mentioned connection, that cleaning shoe is nothing but adopt welding or the two kinds of modes that are spirally connected of directly punching on back-up ring, after welding, must cut away, troublesome poeration, and use next time and must again weld, Rewelding is larger to back-up ring injury; If punched on back-up ring, then easily make the hole site stress of back-up ring concentrate, destroy back-up ring, affect its application life.Not only have employing the technical solution of the utility model only, just art is good for strength, and ground solves each side problem, stops soil body collapse hole in casing, but also easy to operate, pick up speed, to reduce costs, and combine firmly, to back-up ring nothing destruction itself.
Second bright spot is the design and installation mode of protecting muscle block, protect the width of scraping mud portion of the width protecting muscle portion much smaller than cleaning shoe of muscle block, and after protecting two surface soldered in muscle portion, two pieces of stiffeners thickness also much larger than the thickness scraping mud portion, as the term suggests, protect muscle portion and be not used to cut the soil body, do not need too wide, but need continuous and hole wall friction, back-up ring is protected, so thicken, intensity is increased, increases the service life as far as possible, and not only structure is simple to protect muscle block, install and also facilitate, guarantor's muscle block ground the second draw-in groove to be hooked on back-up ring and to be spirally connected with two installing plates, moreover be connected firmly after installing, and the installation protecting muscle block and back-up ring does not increase new structure, but use existing installing plate on back-up ring and be spirally connected, this design scheme fully takes into account and uses cleaning shoe and use the time difference of protecting muscle block two procedures, both are staggered, successively be spirally connected with installing plate, the existing syndeton of maximum using, both functions of cleaning shoe and guarantor's muscle block are not interfere with each other, organically combine, mutual addition, and after protecting the wearing and tearing of the muscle portion that protects on muscle block, the guarantor's muscle block being spirally connected new, being welded new again without the need to cutting, naturally avoiding the injury of Rewelding to back-up ring.
Accompanying drawing explanation
Fig. 1 be the drill bit of prior art construction drill castinplace pile face structural representation.
Fig. 2 is the structural representation after the drill bit of the utility model construction drill castinplace pile has installed cleaning shoe.
Fig. 3 is the plan structure schematic diagram after the drill bit of the utility model construction drill castinplace pile has installed cleaning shoe.
Fig. 4 is the side-looking structural representation in the hole utilizing the drill bit of the utility model construction drill castinplace pile to get out.
Fig. 5 is that the drill bit of the utility model construction drill castinplace pile has installed the structural representation after protecting muscle block.
Shown in figure
The component 101 of prior art drill bit, basic rod, 102, apex point, 103, back-up ring, 104, junction plate, 105, scraper, 106, connecting portion, 107, alloy cutting tooth, 108, protect muscle block;
The component 1 of the utility model drill bit, basic rod, 2, apex point, 3, back-up ring, 4, junction plate, 5, scraper, 6, connecting portion, 7, alloy cutting tooth, 8, cleaning shoe, 8.1, installation portion, 8.2, scrape mud portion, 9, installing plate, 9.1, flange, 10, the first draw-in groove, 11, casing, 12, macropore, 13, aperture, 14, muscle block is protected, 14.1, spiro union portion, 14.2, protect muscle portion, 15, the second draw-in groove, 16, stiffener, 17, steel brush.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
As shown in Fig. 2, Fig. 3, Fig. 4, Fig. 5, the drill bit of the utility model construction drill castinplace pile, it comprises the basic rod 1 of hollow, apex point 2, back-up ring 3, polylith junction plate 4 and scraper 5 the same number of with junction plate 4.Three pieces of junction plates 4 and three pieces of scrapers 5 in the present embodiment.
Basic rod 1 top is provided with connecting portion 6; Specifically, the drilling rod of rig establishes the basic rod 1 of pin thread and drill bit to establish box, and both male and females coordinate tightens connection, described connecting portion 6 i.e. box.
The inners of three pieces of junction plates 4 to be all welded on basic rod 1 and to be uniformly distributed along basic rod 1 circumference, and the outer end of three pieces of junction plates 4 is all welded with the inner peripheral surface of back-up ring 3.Every block scraper 5 and one piece of junction plate 4 are one group, and every block scraper 5 lower end is welded with basic rod 1 and upper end is welded with that block junction plate 4 organized.
Basic rod 1 hollow is convenient to slurry transportation, and basic rod 1 lower end is provided with under shed.Apex point 2 is welded on the under shed of basic rod 1 lower end.
The dual-side of apex point 2 lower end is welded with multiple alloy cutting tooth 7, and the outer side edges of every block scraper 5 is also welded with multiple alloy cutting tooth 7.
The drill bit of the utility model construction drill castinplace pile is also provided with removablely scrapes mud assembly.Each mud assembly of scraping comprises one piece of cleaning shoe 8 and two pieces of installing plates 9.Installing plate 9 is welded on the inner peripheral surface of back-up ring 3, and specifically, installing plate 9 outer end is provided with flange 9.1, and the flange 9.1 of installing plate 9 is welded on the inner peripheral surface of back-up ring 3.Installing plate 9 is provided with screw via hole.Cleaning shoe 8 is provided with the first draw-in groove 10 that Open Side Down, and cleaning shoe 8 part be positioned at inside the first draw-in groove 10 is installation portion 8.1, and cleaning shoe 8 is positioned at part outside the first draw-in groove 10 for scraping mud portion 8.2, and installation portion 8.1 is also provided with screw via hole.Cleaning shoe 8 is hooked on back-up ring 3 through the first draw-in groove 10.Distance between the outward flange of the steel brush 17 of every block cleaning shoe 8 and basic rod 1 axis is the half of casing 11 internal diameter.The installation portion 8.1 of cleaning shoe 8 is between two pieces of installing plates 9 with group.The installation portion 8.1 of cleaning shoe 8 is spirally connected fixing with the installing plate 9 of both sides, and namely cleaning shoe 8 is fixed through the screw of the screw via hole through the screw via hole of left side installing plate 9, the screw via hole of installation portion 8.1 and right side installing plate 9 and the installing plate 9 of both sides.Cleaning shoe 8 scrape the steel brush 17 being provided with outside mud portion 8.2 and being made up of multistrand rope, specifically, the left and right sides of scraping mud portion 8.2 has been spirally connected two block pressur plates, the multistrand rope of steel brush 17 is pressed on the left surface of scraping mud portion 8.2 by the pressing plate on the left side, and the multistrand rope of steel brush 17 is pressed on the right surface of scraping mud portion 8.2 by the pressing plate on the right.
Removable mud assembly of scraping is three groups, is uniformly distributed circumferentially the inner peripheral surface at back-up ring 3.Three pieces of cleaning shoes 8 and three pieces of junction plate 4 alternate intervals are laid, and the angle between every block cleaning shoe 8 and adjacent every block junction plate 4 is 60 degree.
The drill bit of the utility model construction drill castinplace pile also comprises removable polylith and protects muscle block 14, every block protect that muscle block 14 is provided with that Open Side Down for the second draw-in groove 15 with back-up ring 3 hook.Protecting muscle block 14 part be positioned at inside the second draw-in groove 15 is spiro union portion 14.1, protects muscle block 14 and is positioned at part outside the second draw-in groove 15 for protecting muscle portion 14.2.Two surfaces protecting muscle portion 14.2 are all welded with stiffener 16, and spiro union portion 14.1 is also provided with screw via hole.The number protecting muscle block 14 is identical with the number scraping mud assembly, is also three pieces, with one group, every block guarantor muscle block 14 scrapes that mud assembly is corresponding to be existed.
Utilize the construction method of the drill bit of the utility model construction drill castinplace pile, its step is as follows.
A, with hydraulic vibration driver, casing 11 is sunk to the projected depth on stratum.
B, the two pieces of installing plates 9 every group being scraped mud assembly are welded on the inner peripheral surface of the back-up ring 3 of drill bit, first draw-in groove 10 of cleaning shoe 8 to be hooked on back-up ring 3 and to make the installation portion 8.1 of cleaning shoe 8 between two pieces of installing plates 9 with group, and this installation portion 8.1 is spirally connected fixing with the installing plate 9 of both sides.
C, the drill bit of the utility model construction drill castinplace pile to be arranged on the drilling rod of rig.
D, to creep into downwards, until the cleaning shoe 8 of drill bit arrives bottom casing 11, to get out the size macropore 12 identical with casing 11 internal diameter.
E, on carry drill bit, lay down the cleaning shoe 8 scraping mud assembly.
F, the second draw-in groove 15 every block being protected muscle block 14 are hooked on back-up ring 3 and the spiro union portion 14.1 making every block protect muscle block 14 is scraped between two pieces of installing plates 9 of mud assembly at corresponding one group of this guarantor's muscle block 14, and are spirally connected fixing by this spiro union portion 14.1 with the installing plate 9 of both sides.Namely spiro union portion 14.1 is fixed through the screw of the screw via hole through the screw via hole of left side installing plate 9, the screw via hole of spiro union portion 14.1 and right side installing plate 9 and the installing plate 9 of both sides.
G, continuation are crept into downwards, until drill bit arrives stake projected depth, to get out the aperture 13 identical with bored pile intended diameter.
Reinforcing cage is transferred again in h, clear hole, and concrete perfusion.Finally, or casing 11 is stayed in the earth formation, or before concrete initial set, casing 11 is extracted.
Claims (1)
1. a drill bit for construction drill castinplace pile, it comprise the basic rod (1) of hollow, apex point (2), back-up ring (3), polylith junction plate (4) and with junction plate (4) the same number of scraper (5); Basic rod (1) top is provided with connecting portion (6); The inner of polylith junction plate (4) is all welded on basic rod (1) and goes up and be uniformly distributed along basic rod (1) circumference, and the outer end of polylith junction plate (4) is all welded with the inner peripheral surface of back-up ring (3); Every block scraper (5) and one piece of junction plate (4) are one group, and every block scraper (5) lower end is welded with basic rod (1) and upper end is welded with that block junction plate (4) organized; Apex point (2) is welded on basic rod (1) lower end, it is characterized in that:
This drill bit is also provided with removablely scrapes mud assembly, each mud assembly of scraping comprises one piece of cleaning shoe (8) and two pieces of installing plates (9), installing plate (9) is welded on the inner peripheral surface of back-up ring (3), installing plate (9) is provided with screw via hole, cleaning shoe (8) is provided with the first draw-in groove (10) that Open Side Down, the part that cleaning shoe (8) is positioned at the first draw-in groove (10) inner side is installation portion (8.1), cleaning shoe (8) is positioned at the part in the first draw-in groove (10) outside for scraping mud portion (8.2), (8.1) are also provided with screw via hole to installation portion, scrape outside, mud portion (8.2) and be provided with steel brush (17), cleaning shoe (8) is hooked on back-up ring (3) through the first draw-in groove (10), the installation portion (8.1) of cleaning shoe (8) is positioned between two pieces of installing plates (9) with group, the installation portion (8.1) of cleaning shoe (8) and the installing plate (9) of both sides are spirally connected fixing,
This drill bit also comprises removable polylith and protects muscle block (14), every block protect that muscle block (14) is provided with that Open Side Down for the second draw-in groove (15) with back-up ring (3) hook, the part that guarantor's muscle block (14) is positioned at the second draw-in groove (15) inner side is spiro union portion (14.1), protect muscle block (14) and be positioned at the part in the second draw-in groove (15) outside for protecting muscle portion (14.2), two surfaces protecting muscle portion (14.2) are all welded with stiffener (16), and spiro union portion (14.1) is also provided with screw via hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520881619.8U CN205154037U (en) | 2015-11-06 | 2015-11-06 | Drill bit that construction drilling bored concrete pile was used |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520881619.8U CN205154037U (en) | 2015-11-06 | 2015-11-06 | Drill bit that construction drilling bored concrete pile was used |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205154037U true CN205154037U (en) | 2016-04-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520881619.8U Withdrawn - After Issue CN205154037U (en) | 2015-11-06 | 2015-11-06 | Drill bit that construction drilling bored concrete pile was used |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205154037U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105317382A (en) * | 2015-11-06 | 2016-02-10 | 宁波易通建设有限公司 | Drill bit for constructing bored piles and construction method using same |
| CN108240180A (en) * | 2018-01-05 | 2018-07-03 | 绍兴文理学院 | A kind of reverse circulation preventing sticking three wings drag bit assemblies |
| CN110118060A (en) * | 2019-06-18 | 2019-08-13 | 深圳市钻通工程机械股份有限公司 | A kind of no-dig technique combined type PDC reaming bit |
| CN110295850A (en) * | 2019-07-05 | 2019-10-01 | 深圳宏业基岩土科技股份有限公司 | For being engaged the fishing sand hopper reamer bit structure of pile embedding in rock |
| CN111549774A (en) * | 2020-05-08 | 2020-08-18 | 中电建十一局工程有限公司 | Drilling and filling integrated device for processing thick sediment after pile forming |
| CN115419067A (en) * | 2022-09-28 | 2022-12-02 | 陕西建工机械施工集团有限公司 | Collapse hole disposal device and method for cast-in-situ bored pile |
-
2015
- 2015-11-06 CN CN201520881619.8U patent/CN205154037U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105317382A (en) * | 2015-11-06 | 2016-02-10 | 宁波易通建设有限公司 | Drill bit for constructing bored piles and construction method using same |
| CN108240180A (en) * | 2018-01-05 | 2018-07-03 | 绍兴文理学院 | A kind of reverse circulation preventing sticking three wings drag bit assemblies |
| CN108240180B (en) * | 2018-01-05 | 2020-01-03 | 绍兴文理学院 | Positive and negative circulation anti-sticking bores three wings drag bit subassembly |
| CN110118060A (en) * | 2019-06-18 | 2019-08-13 | 深圳市钻通工程机械股份有限公司 | A kind of no-dig technique combined type PDC reaming bit |
| CN110295850A (en) * | 2019-07-05 | 2019-10-01 | 深圳宏业基岩土科技股份有限公司 | For being engaged the fishing sand hopper reamer bit structure of pile embedding in rock |
| CN111549774A (en) * | 2020-05-08 | 2020-08-18 | 中电建十一局工程有限公司 | Drilling and filling integrated device for processing thick sediment after pile forming |
| CN115419067A (en) * | 2022-09-28 | 2022-12-02 | 陕西建工机械施工集团有限公司 | Collapse hole disposal device and method for cast-in-situ bored pile |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160413 Effective date of abandoning: 20180206 |