CN110644925A - Novel plastic drill bit suitable for drilling holes on dense municipal roads of pipelines - Google Patents
Novel plastic drill bit suitable for drilling holes on dense municipal roads of pipelines Download PDFInfo
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- CN110644925A CN110644925A CN201911110717.0A CN201911110717A CN110644925A CN 110644925 A CN110644925 A CN 110644925A CN 201911110717 A CN201911110717 A CN 201911110717A CN 110644925 A CN110644925 A CN 110644925A
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- 238000005553 drilling Methods 0.000 title claims abstract description 54
- 239000004033 plastic Substances 0.000 title claims abstract description 16
- 239000002689 soil Substances 0.000 claims abstract description 17
- 238000011010 flushing procedure Methods 0.000 claims abstract description 15
- 239000012530 fluid Substances 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 11
- 239000004743 Polypropylene Substances 0.000 claims description 9
- -1 polytetrafluoroethylene Polymers 0.000 claims description 9
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 8
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 8
- 229920001155 polypropylene Polymers 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 6
- 239000011435 rock Substances 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 description 8
- 238000010276 construction Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 7
- 238000011835 investigation Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009933 burial Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000009527 percussion Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 208000034699 Vitreous floaters Diseases 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 210000000476 body water Anatomy 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention discloses a novel plastic drill bit suitable for drilling holes on a dense municipal road of a pipeline, wherein the drill bit is in a circular tube shape, one end of the drill bit is a connecting end connected with a rock core pipe of a drilling machine, and the other end of the drill bit is a front end for flushing fluid to circularly and circularly drill; a plurality of U-shaped water channels are uniformly distributed on the side wall of the end part with the annular front end, and a tooth is formed between every two U-shaped water channels; and the included angle a between the side surface of one side of each tooth, which cuts into the soil layer during drilling, and the end surface of the corresponding tooth is 100-120 degrees. The invention not only can efficiently detect the pipeline without damaging the pipeline, but also can achieve the effect of detecting and drilling the core sample and monitoring the hole of the important underground pipeline.
Description
Technical Field
The invention relates to the technical field of shallow soil layer drilling, in particular to a novel plastic drill bit suitable for drilling holes on dense municipal pipelines.
Background
With the continuous development of urbanization construction and the application of various new material pipelines, the underground pipelines of the current municipal roads (particularly old urban roads) are dense, new and old pipelines are staggered up and down, and the situation is complex. The conventional geophysical prospecting means is limited by the configuration, technical method and basic principle of the current equipment, and has certain limitation on the accurate detection of various pipelines which have large sizes, deep burial and are made of non-metallic materials and provided with electromagnetic shielding; in addition, in some areas with large electromagnetic interference, the detection result has certain deviation.
At present, in geotechnical engineering investigation on municipal lines, conventional diamond bits, composite sheet bits or hard alloy bits are used for drilling, and in the construction process, due to limitation and local deviation of underground pipeline data provided in the aspect of geophysical prospecting, the situation of underground pipelines is broken occasionally, so that adverse social influence is caused, and meanwhile, great economic loss is brought to a surveying unit.
Due to the requirements of engineering safety and design construction, in some cases, the conventional pipeline detection method in the aspect of geophysical prospecting cannot accurately detect the pipeline, accurate positioning (such as large-size and large-burial-depth oil pipelines, gas pipelines, water supply pipes, pressure sewage pipes and the like) is required, and drilling hole matching is often required to accurately detect the plane position and burial depth of the pipeline in order to eliminate interference factors due to the limitation of the technical method. Conventional exploration equipment is easy to damage pipelines, and at present, in the aspect of special detection of pipelines, the adopted equipment is low in mechanical degree, original in construction means, low in working efficiency and poor in detection effect.
Some major pipelines are influenced by peripheral engineering construction and may generate certain horizontal displacement and settlement, and in order to ensure the safety of the major pipelines, observation points need to be buried to monitor the displacement and deformation of peripheral important underground pipelines in the construction process. The existing monitoring hole forming process adopts a drilling method, which may cause damage to a heavy pipeline in the hole forming process and directly or indirectly cause adverse effects or potential safety hazards.
The prior art has several solutions for pipeline probing only in geophysical exploration:
scheme 1: chinese patent No. 201210160529.0 discloses a special drill for geophysical prospecting, which uses a drill rod connected with a hollow pipe body with a water outlet hole to perform water flushing to probe pipelines.
Scheme 2: the invention discloses a damage-proof drilling device in Chinese patent No. 201010221056.1, wherein a rubber sleeve is fixed on the outer side of a drill bit of a drill rod through a clamp to perform water-jet probing.
Scheme 3: the invention discloses a special drill bit for underground pipeline exploration, which is disclosed in the Chinese invention with the patent number of 201410237250.7, wherein an ABS hard plastic drill bit with water injection holes is connected with a drill rod, the inner diameter of the water injection holes of the drill bit is 45mm, the wall thickness of the drill bit is 30mm, and the drill bit is provided with two water diversion grooves and two water drainage grooves. Probing the pipeline by water flushing.
Through the analysis of the above three schemes, the following results can be obtained:
According to the scheme 3, the drill bit is directly connected with the drill rod, the inner diameter of a water jetting hole of the drill bit is 45mm, the wall thickness of the drill bit is 30mm, only two water outlet grooves are arranged, the rotary drilling efficiency is extremely low, the method is only suitable for water jet drilling and is limited by a construction method, holes and mud protection walls cannot be well cleaned through the method, and the verticality of the drilled holes and the integrity of the hole walls are poor.
The three schemes are only limited in the aspect of underground pipeline detection, wherein the schemes 1 and 2 have certain usability only after the underground pipeline position is roughly clear, and the soil layer thickness and the depth of the detection are limited; scheme 3 has some advantage in probe depth compared to scheme 1 and scheme 2, but the efficiency is still low. In addition, the three schemes can not solve the problem of safe drilling on the pipeline dense municipal road, and can not meet the requirements of monitoring the lower protective pipe of the formed hole and arranging monitoring instruments for the important underground pipeline.
Therefore, need improve the current drill bit that is used for the probing of shallow soil layer, make it can overcome current technical defect, can safe coring drilling on the intensive town road of pipeline, can satisfy important pipeline monitoring pore-forming demand again, still improve pipeline touch efficiency, increase pipeline touch depth greatly.
Disclosure of Invention
In view of the defects of the prior art, the invention provides the novel plastic drill bit suitable for drilling the holes on the municipal roads with dense pipelines, and the purpose of realizing the seamless butt joint with the rock core pipe in the geotechnical engineering investigation market is achieved, so that the pipelines can be efficiently detected on the municipal roads with dense pipelines without damaging the pipelines, and the effects of drilling, taking core samples and monitoring the holes of important underground pipelines can be achieved.
In order to achieve the purpose, the invention discloses a novel plastic drill bit suitable for drilling holes on a dense municipal road of a pipeline, wherein the drill bit is in a circular pipe shape, one end of the drill bit is a connecting end connected with a rock core pipe of a drilling machine, and the other end of the drill bit is a front end for flushing fluid to circularly and circularly drill.
A plurality of U-shaped water tanks are uniformly distributed on the side wall of the end part of the front end, which is annular, and a tooth is formed between every two U-shaped water tanks;
and the included angle a between the side surface of one side of each tooth, which cuts into the soil layer during drilling, and the end surface of the corresponding tooth is 100-120 degrees.
Preferably, the wall thickness of the drill bit in a circular tube shape becomes thicker gradually from the front end, and the wall thickness L1 of the front end part is 2/3 of the wall thickness L2 of the middle part of the drill bit.
Preferably, the drill bit with the core barrel is by threaded connection mode fixed connection, the link is equipped with the external screw thread, the core barrel is equipped with the internal thread.
Preferably, eight U-shaped water channels are uniformly distributed on the annular end face of the front end.
Preferably, the drill bit is made of polytetrafluoroethylene or polypropylene material, namely PTFE or PP material.
The invention has the beneficial effects that:
the tooth end of the plastic drill bit disclosed by the invention is contacted with a soil layer or an underground pipeline at an obtuse angle during drilling, so that the underground pipeline is prevented from being damaged, and meanwhile, the novel plastic drill bit can be used for rotary drilling in the soil layer, so that the verticality of the wall of a drilled hole is ensured; the thickness of the teeth gradually becomes thicker from the tooth end to a position with a certain distance from the threaded connection, thereby being beneficial to reducing the strength of the tooth end and increasing the elastic reaction when the drill bit meets the underground pipeline during drilling, achieving the purpose of timely exploring the underground pipeline and effectively improving the drilling efficiency of shallow soil layers.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
Fig. 1 shows a schematic longitudinal cross-sectional structure of an embodiment of the present invention.
Fig. 2 is a schematic perspective view of an embodiment of the present invention.
Detailed Description
Examples
As shown in figures 1 and 2, the novel plastic drill bit is suitable for drilling holes on dense municipal roads of pipelines, the drill bit is in a circular tube shape, one end of the drill bit is a connecting end 2 connected with a core barrel 5 of a drilling machine, and the other end of the drill bit is a front end 1 for flushing fluid circulation rotary drilling.
Wherein, a plurality of U-shaped water tanks 4 are uniformly distributed on the side wall of the annular end part of the front end 1, and a tooth 3 is formed between every two U-shaped water tanks 4;
the angle a between the side of each tooth 3 cutting into the earth and the end face of the respective tooth 3 during drilling is 100 ° to 120 °.
The principle of the invention is as follows:
the front end 1 of the drill bit is provided with a plurality of teeth 3, and the included angle a between the side surface of one side of each tooth 3 cut into the soil layer and the end surface of the corresponding tooth 3 is 100-120 degrees when each tooth 3 drills into the soil layer; during drilling, the included angle a with the obtuse angle ensures that the drill bit cannot generate shearing damage once encountering a pipeline, thereby playing a role in protecting the pipeline; the soil layer can be pressed into the medium and soft soil layer, and the cutting drilling is carried out, so that the drilling efficiency is greatly improved, and the verticality of the hole wall is ensured.
In practical application, the width of the U-shaped water tank 4 is basically equal to that of the teeth 3, and the circulation and hole cleaning of flushing liquid during drilling are facilitated.
In some embodiments, the wall thickness of the drill bit in the shape of a round tube gradually becomes thicker from the front end 1, and the wall thickness L1 at the end of the front end 1 is 2/3 of the wall thickness L2 of the middle of the drill bit.
The wall thickness L1 of the front end 1 is thinner than the wall thickness L2 of the middle part of the drill bit, so that the elasticity of the drill bit teeth is increased, the pipeline can be prevented from being damaged, and the strength of the thread part of the drill bit is ensured.
In some embodiments, the drill bit is fixedly connected to the core barrel 5 by a threaded connection, the connecting end 2 is provided with an external thread, and the core barrel 5 is provided with an internal thread.
In some embodiments, eight U-shaped water channels 4 are uniformly distributed on the annular end surface of the front end 1.
Usually 8U-shaped water channels 4 are provided at the drill head 1, with a depth of 20 mm.
In some embodiments, the drill bit is made of a polytetrafluoroethylene or polypropylene material, i.e., a PTFE or PP material.
In the prior art, a common drill bit for geotechnical engineering investigation is generally a diamond drill bit, a composite sheet drill bit or a hard alloy drill bit, and when the common drill bit is used for the engineering investigation on a municipal road with dense pipelines, the common drill bit can easily cause the damage of the pipelines and cause economic loss and bad social influence on an investigation unit; the existing pipeline accurate probing technology cannot be used for geotechnical engineering investigation.
Therefore, a material is selected, and the drill made of the material meets the following requirements:
1. the circulating percussion drilling, the circulating coreless rotary drilling or the coring rotary drilling without flushing liquid can be carried out in a shallow soil layer with the depth of 20 m;
2. the strength is lower than that of common underground pipelines such as cast iron pipes, concrete pipes, hot-dip plastic steel pipes and the like, or once some underground pipelines (such as PE pipes, PVC pipes, corrugated pipes, MPP pipes, glass steel pipes and the like) are exposed to obvious reaction, the drilling in a short time can not cause damage;
3. has certain economical efficiency, machinability, high temperature resistance and flexibility.
Therefore, the novel drill bit is made of polytetrafluoroethylene or polypropylene materials, namely PTFE or PP materials.
In practical application, the invention can adopt different drilling processes according to different purposes.
For instance, in the aspect of geotechnical engineering investigation on the municipal road with dense pipelines, the processes of flushing liquid circulating coreless rotary drilling and flushing liquid-free coring rotary drilling can be adopted.
In the aspect of accurate probing of a geophysical prospecting pipeline, the processes of flushing liquid circulating percussion drilling and flushing liquid circulating coreless rotary drilling can be adopted.
In the aspect of monitoring hole forming of underground heavy pipelines, a flushing liquid circulating coreless rotary drilling process can be adopted.
The rotary drilling parameters are set as follows: the bit pressure is 1MPa, and the rotating speed is 600 r/min.
The expression form of encountering obstacles such as underground pipelines is as follows: the drill bit is obviously rebounded, no ruler is fed in a short time (preferably within 2 min), and polypropylene debris floating objects are found in the circularly returned flushing liquid.
Stopping and lifting the drill immediately when the condition is met, then analyzing and judging according to the reaction of the drill and the characteristics of flushing liquid floaters in the drilling process, and determining the type of the barrier at the lower part, so that the pipeline can be reasonably avoided.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (5)
1. The novel plastic drill bit is suitable for drilling holes on dense municipal pipelines, and is in a circular tube shape, one end of the drill bit is a connecting end (2) connected with a core barrel (5) of a drilling machine, and the other end of the drill bit is a front end (1) for flushing fluid to circularly and circularly drill; the method is characterized in that:
a plurality of U-shaped water tanks (4) are uniformly distributed on the side wall of the annular end part of the front end (1), and a tooth (3) is formed between every two U-shaped water tanks (4);
the included angle a between the side surface of one side, cut into the soil layer, of each tooth (3) and the end surface of the corresponding tooth (3) is 100-120 degrees during drilling.
2. The novel plastic drill bit suitable for drilling holes on dense municipal roads for pipelines according to claim 1, characterized in that the wall thickness of the drill bit in the shape of a circular tube becomes thicker gradually from the front end (1), and the wall thickness L1 at the end of the front end (1) is 2/3 of the wall thickness L2 of the middle part of the drill bit.
3. The novel plastic drill bit suitable for drilling holes in dense municipal roads for pipelines according to claim 1, wherein the drill bit is fixedly connected with the core barrel (5) by means of threaded connection, the connecting end (2) is provided with external threads, and the core barrel (5) is provided with internal threads.
4. The novel plastic drill bit for drilling holes on dense municipal roads with pipelines according to claim 1, characterized in that eight U-shaped water grooves (4) are uniformly distributed on the annular end surface of the front end (1).
5. The novel plastic drill bit for drilling holes on dense municipal roads for pipelines according to claim 1, characterized in that the drill bit is made of polytetrafluoroethylene or polypropylene material, namely PTFE or PP material.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2019105375336 | 2019-06-20 | ||
| CN201910537533.6A CN110185396A (en) | 2019-06-20 | 2019-06-20 | Suitable for the new drill drilled on the intensive town road of pipeline |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110644925A true CN110644925A (en) | 2020-01-03 |
Family
ID=67722562
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910537533.6A Withdrawn CN110185396A (en) | 2019-06-20 | 2019-06-20 | Suitable for the new drill drilled on the intensive town road of pipeline |
| CN201911110717.0A Pending CN110644925A (en) | 2019-06-20 | 2019-11-14 | Novel plastic drill bit suitable for drilling holes on dense municipal roads of pipelines |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910537533.6A Withdrawn CN110185396A (en) | 2019-06-20 | 2019-06-20 | Suitable for the new drill drilled on the intensive town road of pipeline |
Country Status (1)
| Country | Link |
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| CN (2) | CN110185396A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111550193A (en) * | 2020-05-20 | 2020-08-18 | 西安长庆科技工程有限责任公司 | Engineering exploration drill bit and method capable of early warning underground metal pipeline |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110714734A (en) * | 2019-11-14 | 2020-01-21 | 上海市城市建设设计研究总院（集团）有限公司 | Pipeline touch construction method for effectively preventing underground pipeline from being damaged |
| CN112411527A (en) * | 2020-10-19 | 2021-02-26 | 南京格洛特环境工程股份有限公司 | Blocking method for in-situ remediation of polluted land under complex working conditions |
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| CN101737005A (en) * | 2009-12-22 | 2010-06-16 | 北京住总集团有限责任公司 | Drilling tool for sleeving anchor cable and construction method for sleeving anchor cable with simultaneous casing |
| US20120186876A1 (en) * | 2011-01-25 | 2012-07-26 | Christopher Dale Langhart | Core drill bit |
| CN103993835A (en) * | 2014-05-30 | 2014-08-20 | 浙江省工程勘察院 | Special drill bit for underground pipeline exploration |
| CN107355183A (en) * | 2017-07-25 | 2017-11-17 | 中国铁路设计集团有限公司 | The geological drilling hollow boring bit suitably used in earth's surface broken ground |
| CN107956427A (en) * | 2017-12-20 | 2018-04-24 | 莒县恒阳机械有限公司 | The anti-oblique diamond-impregnated bit of commutating tooth |
| CN208310757U (en) * | 2018-06-14 | 2019-01-01 | 北京市政建设集团有限责任公司 | A kind of rich water weak soil, the artificial bore detecting device of thin silt ultra-deep pipeline |
| CN109372438A (en) * | 2018-11-16 | 2019-02-22 | 中国电建市政建设集团有限公司 | Not damaged high pressure water prospecting system and geophysical prospecting method |
| CN211314111U (en) * | 2019-06-20 | 2020-08-21 | 上海市城市建设设计研究总院（集团）有限公司 | Novel plastic drill bit suitable for drilling holes on dense municipal roads of pipelines |
-
2019
- 2019-06-20 CN CN201910537533.6A patent/CN110185396A/en not_active Withdrawn
- 2019-11-14 CN CN201911110717.0A patent/CN110644925A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101737005A (en) * | 2009-12-22 | 2010-06-16 | 北京住总集团有限责任公司 | Drilling tool for sleeving anchor cable and construction method for sleeving anchor cable with simultaneous casing |
| US20120186876A1 (en) * | 2011-01-25 | 2012-07-26 | Christopher Dale Langhart | Core drill bit |
| CN103993835A (en) * | 2014-05-30 | 2014-08-20 | 浙江省工程勘察院 | Special drill bit for underground pipeline exploration |
| CN107355183A (en) * | 2017-07-25 | 2017-11-17 | 中国铁路设计集团有限公司 | The geological drilling hollow boring bit suitably used in earth's surface broken ground |
| CN107956427A (en) * | 2017-12-20 | 2018-04-24 | 莒县恒阳机械有限公司 | The anti-oblique diamond-impregnated bit of commutating tooth |
| CN208310757U (en) * | 2018-06-14 | 2019-01-01 | 北京市政建设集团有限责任公司 | A kind of rich water weak soil, the artificial bore detecting device of thin silt ultra-deep pipeline |
| CN109372438A (en) * | 2018-11-16 | 2019-02-22 | 中国电建市政建设集团有限公司 | Not damaged high pressure water prospecting system and geophysical prospecting method |
| CN211314111U (en) * | 2019-06-20 | 2020-08-21 | 上海市城市建设设计研究总院（集团）有限公司 | Novel plastic drill bit suitable for drilling holes on dense municipal roads of pipelines |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111550193A (en) * | 2020-05-20 | 2020-08-18 | 西安长庆科技工程有限责任公司 | Engineering exploration drill bit and method capable of early warning underground metal pipeline |
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| Publication number | Publication date |
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| CN110185396A (en) | 2019-08-30 |
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