CN111335368A - Method for installing inclinometer pipe - Google Patents
Method for installing inclinometer pipe Download PDFInfo
- Publication number
- CN111335368A CN111335368A CN202010110256.3A CN202010110256A CN111335368A CN 111335368 A CN111335368 A CN 111335368A CN 202010110256 A CN202010110256 A CN 202010110256A CN 111335368 A CN111335368 A CN 111335368A
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- Prior art keywords
- pipe
- inclinometer
- sleeve
- slurry
- hole
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000002002 slurry Substances 0.000 claims abstract description 47
- 239000004576 sand Substances 0.000 claims abstract description 26
- 238000005553 drilling Methods 0.000 claims abstract description 21
- 238000009434 installation Methods 0.000 claims abstract description 18
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 7
- 239000000440 bentonite Substances 0.000 claims abstract description 7
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims description 4
- 238000013461 design Methods 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 2
- 238000005086 pumping Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 2
- 238000012544 monitoring process Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
-
- 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
-
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses an installation method of an inclinometer pipe, which adopts a drilling machine, a sleeve and a rubber pipe which are provided with a slurry pump to install the inclinometer pipe; the sleeve is of a double-layer pipe structure and is provided with a hollow channel, and the inner diameter of the sleeve is larger than the outer diameter of the inclinometer so that the sleeve can be sleeved outside the inclinometer; in the drilling process, the inlet end of a slurry pump is used for pumping bentonite slurry by a connected rubber pipe, the outlet end of the slurry pump is connected with a hollow drill rod through a hose, and the slurry enters the drilled hole through the hollow drill rod to protect the wall; after the drill hole is drilled to the designed elevation of the hole bottom, the drill rod is taken out, and then the casing pipe is placed in the drill hole; then inserting a rubber pipe at the inlet end of the slurry pump into the drilled hole to dry the slurry, and putting the inclinometer pipe into the sleeve section by section; and finally, gradually pulling out the sleeve upwards, and uniformly injecting fine sand into the hollow channel of the sleeve to fill the gap between the drill hole and the inclinometer. The method solves the hidden trouble of later-stage inclinometer pipe floating, and ensures that the backfill material can be compactly sunk into the bottom of the hole.
Description
Technical Field
The invention belongs to the technical field of foundation pit monitoring, and particularly relates to an installation method of an inclinometer pipe.
Background
The monitoring of the horizontal displacement of the deep foundation pit is a reliable basis for analyzing the stability of the side slope (deep foundation pit), and the accuracy of the measuring result is the guarantee for checking the construction quality and controlling the construction progress.
The monitoring of the deep horizontal displacement of foundation pit needs to install the deviational survey pipe, and according to the difference of the side slope (deep foundation pit) supporting construction form (soil nail wall, steel sheet pile, bored concrete pile, diaphragm wall), the installation method of deviational survey pipe also has the difference, if: in the cast-in-place pile support, an inclinometer pipe is bound on a reinforcement cage and then integrally placed in a drill hole; an inclinometer pipe in the steel sheet pile support is welded on the steel sheet pile through a hoop and is pressed into the soil body through hammering equipment; for the soil nailing wall supporting or slope setting excavation area, the inclination measuring pipe is usually embedded in a drill hole near the side slope, and then the gap between the inclination measuring pipe and the drill hole is backfilled, so that the method is widely applied by related technicians in the monitoring field all the time, but with the increase of practical application, the method also exposes various problems, such as: 1. the inclinometer pipe is difficult to lower, and the pipe bottom cannot reach the design depth, so that the measurement result cannot meet the standard requirement; after the inclinometer pipe is assembled, the whole tightness is good, and a high water level exists in a drill hole under the influence of a grouting protection wall and an underground water level, so that the inclinometer pipe is difficult to put down to the bottom of the hole due to high buoyancy when put down, and the hidden danger of floating exists after the inclinometer pipe is put down; 2. the hole drilling and shrinkage quality is poor, so that the accuracy of a measuring result is poor, and measuring data cannot be applied; because the mud that exists certain concentration in the drilling receives hydraulic influence simultaneously, causes the drilling backfill can't sink to the hole bottom, and along with downthehole water level decline and precipitation infiltration influence, the backfill sinks, and "hollow" appears in the drilling to rock because of the deviational survey pipe during the measurement and lead to the unable use of measured data.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an installation method of an inclinometer pipe. The method can ensure that the inclinometer pipe can be installed to the designed elevation of the drilled hole, and solves the hidden danger of later-stage upward floating of the inclinometer pipe; the backfill can sink to the bottom of the hole compactly, and the shrinkage cavity quality can be effectively guaranteed, so that the accuracy of monitoring data is guaranteed.
The invention is realized by the following technical scheme:
a method for installing an inclinometer pipe comprises the steps of installing the inclinometer pipe by a drilling machine, a sleeve and a rubber pipe which are provided with a slurry pump; the sleeve is of a double-layer pipe structure and comprises an outer pipe and an inner pipe, the inner pipe is coaxially arranged in the outer pipe, a hollow channel is formed between the outer pipe and the inner pipe, and a connecting rib is arranged between the outer pipe and the inner pipe; the inner diameter of the sleeve is larger than the outer diameter of the inclinometer pipe, so that the sleeve can be sleeved outside the inclinometer pipe;
the installation of the inclinometer pipe comprises the following steps:
firstly, stirring bentonite into slurry with a certain concentration in advance, and simultaneously starting a drilling machine to drill holes at a position specified by the design of the top of a slope;
in the drilling process, a slurry pump is started, bentonite slurry is pumped by the inlet end of the slurry pump through a connected rubber pipe, the outlet end of the slurry pump is connected with a hollow drill rod through a hose, and the slurry enters the drilled hole through the hollow drill rod to protect the wall;
step three, after drilling to the designed elevation of the hole bottom, taking out the drill rod, and then putting the casing in the drill hole until the hole bottom;
and step four, taking out the rubber pipe at the inlet end of the slurry pump from the slurry barrel, inserting the rubber pipe into the bottom of the sleeve in the drill hole, starting the slurry pump to dry the slurry in the drill hole, and taking out the rubber pipe after the slurry pump is dried.
Step five, putting the inclinometer pipe in the casing section by section;
and step six, gradually pulling out the sleeve upwards, and uniformly injecting fine sand into the hollow channel between the inner pipe and the outer pipe of the sleeve, so that the fine sand falls into the drill hole along the hollow channel, and the gap between the drill hole and the inclinometer pipe is filled.
In the technical scheme, the inclinometer pipe is of a segmented assembly type structure and comprises a bottom plug, a pipe body, a pipe hoop and a top cover.
In the above technical scheme, the outer pipe and the inner pipe of the sleeve are provided with water permeable holes.
In the technical scheme, the rubber tube is a plastic hose, and the tube head is provided with an iron block with a certain weight.
In the above technical solution, the sleeve may adopt a sectional assembly structure.
In above-mentioned technical scheme, pour into the fine sand in-process, the fine sand that will evenly gradually add prevents to block up hollow passage, if hollow passage blocks up, can insert the pestle instrument in to hollow passage, pestle the falling downwards with the fine sand that blocks up in the hollow passage.
In the technical scheme, in the process of injecting fine sand, the backfilling fine sand in the gap between the drill hole and the inclinometer pipe can be properly compacted by using the pestle tool, so that the drill hole is prevented from being hollow.
In above-mentioned technical scheme, pestle instrument, its front portion is an arc, and the afterbody is a thin pole, thin pole and this arc welding, and the radian of arc is unanimous with sheathed tube cavity passageway radian, and arc thickness slightly is less than the width of cavity passageway to make the arc insert in the cavity passageway, during the use, the staff holds the thin pole of afterbody, inserts the arc in the cavity passageway, carries out the operation.
The invention has the advantages and beneficial effects that:
1. the invention solves the problem that the down-put cannot be realized or the down-put cannot reach the designed hole bottom elevation due to the collapse of the hole wall in the down-put process of the inclinometer pipe.
2. The mud pump is used for pumping the slurry of the drill hole by utilizing the advantage that the drilling machine carries the mud pump and combining the action of the casing, so that a series of problems that the inclinometer pipe is difficult to lower, the hidden danger of floating exists after the inclinometer pipe is lowered and the like are ingeniously solved.
3. The invention utilizes the slurry pump to pump the slurry in the drill hole and combines the action of the casing, thereby not only solving the problem of lowering the inclinometer pipe, but also ensuring that the backfill material can be densely backfilled at the hole bottom. When the fine sand is backfilled, the fine sand is backfilled downwards through the hollow channel of the sleeve, so that the hollow channel of the sleeve provides a stable backfilling channel, the fine sand can be smoothly backfilled into the drilled hole, and the shrinkage cavity quality of the drilled hole and the accuracy of monitoring data are effectively ensured.
In addition, the invention has the advantages of convenient installation and operation, time and labor saving, better controllability and implementability, and greatly improved installation efficiency of the inclinometer.
Drawings
FIG. 1 is a schematic illustration of a drilling rig mud pumping process of the present invention;
FIG. 2 is a schematic view of the present invention after installation of the inclinometer;
FIG. 3 is a schematic illustration of the present invention with fine sand backfilled;
FIG. 4 is a schematic cross-sectional view of a cannula according to the present invention;
fig. 5 is a schematic view of the pestle tool of the present invention.
Wherein:
1: a drilling machine, 2: sleeve, 3: rubber tube, 4: inclinometer tube, 2-1: outer tube, 2-2: inner tube, 2-3: connecting ribs, 2-4: hollow passage, 5: slurry pump, 6-1: arc-shaped plate, 6-2: a thin rod.
For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the present invention is further described below with reference to specific examples.
Example one
A method for installing an inclinometer, which needs to use: a drilling machine 1 equipped with a slurry pump 5, a casing 2, and a rubber tube 3.
The sleeve 2 is of a double-layer pipe structure, and particularly, referring to the attached drawing 4, the sleeve 2 comprises an outer pipe 2-1 and an inner pipe 2-2, the inner pipe is coaxially arranged in the outer pipe, a hollow channel 2-4 is arranged between the outer pipe and the inner pipe, and a connecting rib 2-3 is arranged between the outer pipe and the inner pipe, so that the outer pipe and the inner pipe are connected into a whole; the inner diameter of the casing 2 (i.e. the inner diameter of the inner pipe of the casing) is larger than the outer diameter of the inclinometer 4 so that the casing can fit outside the inclinometer 4.
The inclinometer 4 adopts a sectional assembly type structure and comprises a bottom plug, a pipe body, a pipe hoop and a top cover.
The top end of the rubber tube 3 is connected with a mud pump 5 for sucking mud.
The installation method of the inclinometer pipe comprises the following steps:
firstly, stirring bentonite into slurry with a certain concentration in advance, and simultaneously starting a drilling machine to drill holes at a position specified by the design of the top of a slope;
in the drilling process, a slurry pump is started, bentonite slurry is pumped by the inlet end of the slurry pump through a connected rubber pipe, the outlet end of the slurry pump is connected with a hollow drill rod through a hose, and the slurry enters the drilled hole through the hollow drill rod to protect the wall;
step three, after drilling to the designed elevation of the hole bottom, taking out the drill rod, and then putting the casing in the drill hole until the hole bottom;
and step four, taking out the rubber pipe at the inlet end of the slurry pump from the slurry barrel, inserting the rubber pipe into the bottom of the sleeve in the drill hole, starting the slurry pump to pump the slurry in the drill hole (shown in figure 1), and taking out the rubber pipe after the slurry pump is pumped to be dry.
Putting the inclinometer pipes into the sleeve section by section until the last pipe body is 30-50 cm higher than the orifice, and covering a top cover on the pipe orifice (figure 2);
and step six, gradually pulling out the sleeve upwards, and uniformly injecting fine sand into the hollow channel between the inner pipe and the outer pipe of the sleeve, so that the fine sand falls into the drill hole along the hollow channel (figure 3), and the gap between the drill hole and the inclinometer pipe is filled. In the process of injecting the fine sand, the fine sand is added uniformly and gradually to prevent the hollow channel from being blocked, and if the hollow channel is blocked, a pestle tool can be inserted into the hollow channel to pestle the fine sand blocked in the hollow channel downwards; in addition, in the process of injecting the fine sand, the backfilling fine sand in the gap between the drill hole and the inclinometer pipe can be properly compacted by using the pestle tool, so that the drill hole is prevented from being hollow.
Further, the pestle tool is required to be inserted into the hollow channel of the sleeve, and preferably, the area of the bottom end surface of the pestle tool is required to be as large as possible, so that the pestle tool is convenient to use and good in effect. For example, referring to fig. 5, a pestle tool is provided, which comprises an arc-shaped plate 6-1 at the front part, a thin rod 6-2 at the tail part, the thin rod 6-2 is welded with the arc-shaped plate 6-1, the radian of the arc-shaped plate is consistent with that of a hollow channel of a sleeve, the thickness of the arc-shaped plate is slightly smaller than the width of the hollow channel, so that the arc-shaped plate can be inserted into the hollow channel, and when the pestle tool is used, a worker holds the thin rod at the tail part and inserts the arc-shaped plate into the hollow channel to perform work.
Furthermore, the outer pipe and the inner pipe of the sleeve are provided with water permeable holes, so that mud in the drilled hole can quickly enter the pipe.
Furthermore, the rubber tube is a plastic hose, and the tube head is provided with an iron block with a certain weight so as to be conveniently placed in the drill hole.
Example two
Furthermore, the casing can adopt a sectional assembly type structure, namely, the casing comprises a plurality of sub-casing pipe sections (the length is about 1 meter), and the sub-casing pipe sections are connected through hoops, threads, buckles or other connecting structures to reach the required length.
The invention has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the invention fall within the scope of the invention.
Claims (8)
1. A method for installing an inclinometer pipe is characterized by comprising the following steps: the method adopts a drilling machine, a sleeve and a rubber tube which are provided with a slurry pump to carry out inclinometer tube installation; the sleeve is of a double-layer pipe structure and comprises an outer pipe and an inner pipe, the inner pipe is coaxially arranged in the outer pipe, a hollow channel is formed between the outer pipe and the inner pipe, and a connecting rib is arranged between the outer pipe and the inner pipe; the inner diameter of the sleeve is larger than the outer diameter of the inclinometer pipe, so that the sleeve can be sleeved outside the inclinometer pipe;
the installation of the inclinometer pipe comprises the following steps:
firstly, stirring bentonite into slurry with a certain concentration in advance, and simultaneously starting a drilling machine to drill holes at a position specified by the design of the top of a slope;
in the drilling process, a slurry pump is started, bentonite slurry is pumped by the inlet end of the slurry pump through a connected rubber pipe, the outlet end of the slurry pump is connected with a hollow drill rod through a hose, and the slurry enters the drilled hole through the hollow drill rod to protect the wall;
step three, after drilling to the designed elevation of the hole bottom, taking out the drill rod, and then putting the casing in the drill hole until the hole bottom;
and step four, taking out the rubber pipe at the inlet end of the slurry pump from the slurry barrel, inserting the rubber pipe into the bottom of the sleeve in the drill hole, starting the slurry pump to dry the slurry in the drill hole, and taking out the rubber pipe after the slurry pump is dried.
Step five, putting the inclinometer pipe in the casing section by section;
and step six, gradually pulling out the sleeve upwards, and uniformly injecting fine sand into the hollow channel between the inner pipe and the outer pipe of the sleeve, so that the fine sand falls into the drill hole along the hollow channel, and the gap between the drill hole and the inclinometer pipe is filled.
2. The inclinometer pipe installation method according to claim 1, characterized in that: the inclinometer tube adopts a sectional assembly type structure and comprises a bottom plug, a tube body, a tube hoop and a top cover.
3. The inclinometer pipe installation method according to claim 1, characterized in that: the outer pipe and the inner pipe of the sleeve are provided with water permeable holes.
4. The inclinometer pipe installation method according to claim 1, characterized in that: the rubber tube is a plastic hose, and the tube head is provided with an iron block with a certain weight.
5. The inclinometer pipe installation method according to claim 1, characterized in that: the sleeve may be of a segmented assembly construction.
6. The inclinometer pipe installation method according to claim 1, characterized in that: and in the process of injecting the fine sand, uniformly and gradually adding the fine sand to prevent the hollow channel from being blocked, and if the hollow channel is blocked, inserting a pestle tool into the hollow channel to pestle the fine sand blocked in the hollow channel downwards.
7. The inclinometer pipe installation method according to claim 1, characterized in that: during the process of injecting the fine sand, the backfilled fine sand in the gap between the drill hole and the inclinometer pipe can be properly compacted by using a pestle tool.
8. The inclinometer tube installation method according to claim 7, characterized in that: pestle instrument, its front portion is an arc, and the afterbody is a thin pole, and thin pole and this arc welding, the radian of arc is unanimous with sheathed tube cavity passageway radian, and arc thickness slightly is less than the width of cavity passageway to make the arc can insert the cavity passageway in, during the use, the staff holds the thin pole of afterbody, inserts the arc and carries out the operation in the cavity passageway.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010110256.3A CN111335368B (en) | 2020-02-24 | 2020-02-24 | Method for installing inclinometer pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010110256.3A CN111335368B (en) | 2020-02-24 | 2020-02-24 | Method for installing inclinometer pipe |
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| CN111335368A true CN111335368A (en) | 2020-06-26 |
| CN111335368B CN111335368B (en) | 2021-10-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022174830A1 (en) * | 2021-02-20 | 2022-08-25 | 上海市政工程设计研究总院（集团）有限公司 | Well construction method for groundwater environmental monitoring well |
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| AU2009276444A1 (en) * | 2008-08-01 | 2010-02-04 | Schlumberger Technology B.V. | Method of circulating while retrieving downhole tool in casing |
| US20100124462A1 (en) * | 2005-02-28 | 2010-05-20 | Roussy Raymond J | Method and system for installing geothermal transfer apparatuses with a sonic drill |
| CN201526279U (en) * | 2009-11-06 | 2010-07-14 | 义马煤业集团股份有限公司千秋煤矿 | Anti-collapse sleeve and component |
| CN202466554U (en) * | 2011-12-23 | 2012-10-03 | 基康仪器(北京)有限公司 | Soil displacement measuring device |
| CN207160090U (en) * | 2017-08-31 | 2018-03-30 | 江苏省建筑工程质量检测中心有限公司 | Pre-buried inclinometer tube orifice protection device |
| CN209162792U (en) * | 2018-11-02 | 2019-07-26 | 中铁四局集团有限公司 | Installation device of inclinometer pipe in fine sand-containing stratum |
| CN110409401A (en) * | 2019-07-16 | 2019-11-05 | 杭州瑞纽宝科技有限公司 | A kind of light pit retaining monitoring device and application method |
-
2020
- 2020-02-24 CN CN202010110256.3A patent/CN111335368B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85108013A (en) * | 1984-10-04 | 1986-05-10 | 石油钻探公司 | Sleeve pipe or surface pipe squeeze into utensil and method |
| US20100124462A1 (en) * | 2005-02-28 | 2010-05-20 | Roussy Raymond J | Method and system for installing geothermal transfer apparatuses with a sonic drill |
| AU2009276444A1 (en) * | 2008-08-01 | 2010-02-04 | Schlumberger Technology B.V. | Method of circulating while retrieving downhole tool in casing |
| CN201526279U (en) * | 2009-11-06 | 2010-07-14 | 义马煤业集团股份有限公司千秋煤矿 | Anti-collapse sleeve and component |
| CN202466554U (en) * | 2011-12-23 | 2012-10-03 | 基康仪器(北京)有限公司 | Soil displacement measuring device |
| CN207160090U (en) * | 2017-08-31 | 2018-03-30 | 江苏省建筑工程质量检测中心有限公司 | Pre-buried inclinometer tube orifice protection device |
| CN209162792U (en) * | 2018-11-02 | 2019-07-26 | 中铁四局集团有限公司 | Installation device of inclinometer pipe in fine sand-containing stratum |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022174830A1 (en) * | 2021-02-20 | 2022-08-25 | 上海市政工程设计研究总院（集团）有限公司 | Well construction method for groundwater environmental monitoring well |
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| CN111335368B (en) | 2021-10-22 |
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