CN115450567A - Horizontal telescopic rotary spraying drill rod and construction method thereof - Google Patents
Horizontal telescopic rotary spraying drill rod and construction method thereof Download PDFInfo
- Publication number
- CN115450567A CN115450567A CN202211191679.8A CN202211191679A CN115450567A CN 115450567 A CN115450567 A CN 115450567A CN 202211191679 A CN202211191679 A CN 202211191679A CN 115450567 A CN115450567 A CN 115450567A
- Authority
- CN
- China
- Prior art keywords
- slurry
- channel
- pressure
- connecting rod
- nozzle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010276 construction Methods 0.000 title claims abstract description 53
- 238000005507 spraying Methods 0.000 title claims abstract description 33
- 239000002002 slurry Substances 0.000 claims abstract description 192
- 238000005192 partition Methods 0.000 claims abstract description 24
- 238000005553 drilling Methods 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 72
- 239000010720 hydraulic oil Substances 0.000 claims description 68
- 238000000034 method Methods 0.000 claims description 33
- 238000007789 sealing Methods 0.000 claims description 31
- 239000004568 cement Substances 0.000 claims description 24
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 238000013461 design Methods 0.000 claims description 5
- 230000006698 induction Effects 0.000 claims description 3
- 239000002689 soil Substances 0.000 description 20
- 238000005516 engineering process Methods 0.000 description 8
- 230000002093 peripheral effect Effects 0.000 description 7
- 239000000203 mixture Substances 0.000 description 4
- 239000007921 spray Substances 0.000 description 3
- 239000004927 clay Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000006467 substitution reaction 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Civil Engineering (AREA)
- Paleontology (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a horizontal telescopic rotary spraying drill rod and a construction method thereof, belonging to the technical field of pile foundation construction and comprising a drill rod main body, a cover plate bolt, an upper nozzle, a lower nozzle, an upper slurry channel, a lower slurry channel, a gas channel, a high-pressure medium channel, a connecting bolt hole, an upper air chamber, a lower air chamber, a partition plate, a high-pressure pipe joint, a hose, a driving connecting rod, a vent hole, a guide roller and a lower air passage; the drilling rod comprises a drilling rod body and is characterized in that an upper slurry channel, a lower slurry channel and a gas channel are arranged inside the drilling rod body, an upper nozzle and a lower nozzle are arranged on the surface of the drilling rod body, the upper slurry channel is communicated with the upper nozzle, the lower slurry channel is communicated with the lower nozzle, the gas channel is communicated with an upper air chamber, the upper air chamber is communicated with the upper nozzle, the upper air chamber is communicated with a lower air chamber through a vent hole, and the lower air chamber is communicated with a lower gas channel. The invention can not only meet the pile forming requirements of large pile diameter and large depth, but also realize the construction of small pile diameter and small depth.
Description
Technical Field
The invention relates to the technical field of pile foundation construction, in particular to a horizontal telescopic rotary spraying drill rod and a construction method thereof.
Background
The high-pressure rotary spraying construction technology is characterized in that a rotating nozzle sprays high-speed fluid to cut soil body and mix cement slurry with the cut soil body, and a firm reinforced soil column is formed after chemical reaction, and the strength can reach more than several megapascals. The method was invented by doctor Shi, zhongxi, of NIT, japan, and was originally a simple single-tube method (also referred to as the CCP method), and then a double-tube method, a triple-tube method, and the like were developed. The single-pipe method only sprays cement slurry; the double-pipe method uses compressed air to coaxially wrap high-pressure cement slurry to cut the soil body and mutually mix the soil body and the high-pressure cement slurry, so that the diameter of the reinforced body is greatly improved than that of a single-pipe method; the triple tube method is characterized in that compressed air coaxially wraps high-pressure water flow to cut a soil body firstly to form a soil crushing gap with a larger diameter, and then a slurry pump is used for injecting cement slurry to fill and mix the soil crushing gap with the larger diameter, so that the diameter of a reinforced body is greatly improved in the former two methods. Then, a super rotary spraying technology, a double high-pressure rotary spraying technology, a cross jet rotary spraying technology, a double liquid rotary spraying technology and the like are developed, so that the diameter of the generated pile is increased. After the high-pressure jet grouting construction technology is successfully developed in China from the end of the 70 s, the construction method is widely applied to more domestic engineering fields, such as seepage-proofing walls of hydraulic engineering, urban underground engineering, slope stability, wharfs, bridge foundations and the like.
The pile diameter of the jet grouting pile has great influence on the bearing capacity of the pile, and the quality of the project is determined. The prior art of the jet grouting pile can theoretically have pile forming diameter more than 2.5m in both RJP and MJS, double pipes and triple pipes, but the pile forming diameter is not more than 2.5m or the pile forming is uneven, and individual strata can reach more than 2.5m in view of actual construction conditions. In addition, field experiments are carried out on the projects of PJP, MJS and double pipes, the diameter of a test pile is 2.5m, the depth of the test is 70m, and two main soil layers of a clay layer and a sand layer are covered, but the experimental effect shows that most of piles do not meet the design requirements, so that the existing rotary spraying technology on the market is not strong in applicability to large pile diameter and large depth. In order to solve the problems, the invention provides a horizontal telescopic jet grouting drill rod and a construction method thereof, the technology not only can meet the pile forming requirements of large pile diameter and large depth, but also can realize the construction of small pile diameter and small depth, and the problems which can be solved and cannot be solved by the original process can be solved.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a horizontal telescopic rotary spraying drill rod and a construction method thereof, and overcomes the defects in the prior art. The construction of small pile diameter is realized by arranging two nozzle positions of an upper nozzle and a lower nozzle and adjusting the injection pressure of the two nozzles, the peripheral soil body is firstly injected by the upper nozzle to form a loose space, and then the lower nozzle extends out of the critical position of the loose space, so that the aperture of the peripheral soil body is crushed by the relay of the upper nozzle and the lower nozzle, and the construction of large pile diameter is realized.
A horizontal telescopic rotary spraying drill rod is characterized by comprising a drill rod main body, a cover plate bolt, an upper nozzle, a lower nozzle, an upper slurry channel, a lower slurry channel, a gas channel, a high-pressure medium channel, a connecting bolt hole, an upper air chamber, a lower air chamber, a partition plate, a high-pressure pipe joint, a hose, a driving connecting rod, an air vent, a guide roller and a lower air passage; the drill rod main body is connected with the cover plate through a cover plate bolt, and a sealing ring is arranged between the cover plate and the cover plate bolt; an upper slurry channel, a lower slurry channel and a gas channel are arranged in the drill rod main body, an upper nozzle and a lower nozzle are arranged on the surface of the drill rod main body, the upper slurry channel is communicated with the upper nozzle, the lower slurry channel is communicated with the lower nozzle, the gas channel is communicated with an upper air chamber, the upper air chamber is communicated with the upper nozzle, a partition plate is arranged between the upper air chamber and the lower air chamber, the partition plate is welded with the drill rod main body, a vent hole is formed in the partition plate, the upper air chamber is communicated with the lower air chamber through the vent hole, and the lower air chamber is communicated with the lower air passage; the hose is connected with a driving connecting rod through a high-pressure pipe joint, the hose is communicated with the lower nozzle, the driving connecting rod is inserted into the lower slurry channel, the upper end part of the driving connection is provided with a sealing ring, the lower end part of the lower slurry channel is provided with a sealing ring, and the high-pressure medium channel is connected with a sealing cavity formed between the driving connecting rod and the lower slurry channel; a fixed shaft of the guide roller is welded with the drill rod main body, the guide roller is connected with the fixed shaft through a bearing, and a hose penetrates between the two guide rollers; the upper end part of the drill rod main body is provided with a connecting bolt hole.
Preferably, the width of the cover plate is half of the drill rod body, the length of the cover plate is 1/2~2/3 of the drill rod body, and two ends of the cover plate are of an oblique angle structure.
Preferably, the upper slurry channel and the lower slurry channel are both rigid structures, a sealing ring at the lower end part of the lower slurry channel is in close contact with the outer wall of the driving connection, and a sealing ring at the upper end part of the driving connecting rod is in close contact with the inner wall of the lower slurry channel.
Preferably, the medium flowing in the high-pressure medium passage is water or hydraulic oil.
Preferably, the hose is of a double-layer tubular structure, the middle of the hose is provided with a slurry passage, a lower air passage is arranged between the slurry passage and the outer wall of the hose and is of a quincunx structure, the lower air passage is divided into five parts, the parts are not communicated with each other, and high-pressure gas in the lower air chamber is converged at the lower nozzle through the lower air passage and is sprayed.
A construction method of a horizontal telescopic rotary spraying drill rod is characterized in that the construction is carried out by adopting the horizontal telescopic rotary spraying drill rod, and the specific construction steps are as follows:
the method comprises the following steps: hole guiding construction
Adopting a hole guiding drilling machine to carry out hole guiding construction on the designed pile position;
step two: jet lift
Put into the draw-in hole with the telescopic jet-grouting drilling rod of level to sink to the hole bottom, promote the drilling rod gradually, the in-process that promotes the drilling rod is adjusted the position of nozzle down according to the design stake footpath, specifically as follows:
(1) When the diameter of the rotary jet pile is designed to be 400mm to 1000mm, cement slurry or water enters an upper nozzle from an upper slurry channel, the injection pressure is controlled to be 20MPa to 35MPa, the cement slurry enters a driving connecting rod from a lower slurry channel, enters a hose from the driving connecting rod and is jetted from a lower nozzle, the injection pressure is controlled to be 20MPa to 35MPa, hydraulic oil or water enters a sealed cavity formed between the driving connecting rod and the lower slurry channel from a high-pressure medium channel, the pushing pressure of the hydraulic oil or the water to the driving connecting rod is 20MPa to 35MPa, the driving connecting rod keeps balance under the combined action of the hydraulic oil and the slurry pressure, the position of the lower nozzle is unchanged, high-pressure gas in the whole process enters an upper air chamber through a gas channel, part of the high-pressure gas in the upper air chamber is jetted by wrapping the slurry through the upper nozzle, part of the high-pressure gas in a partition plate enters a lower air chamber through a vent hole in a partition plate, and the high-pressure gas in the lower air chamber enters the hose through a lower air channel and is further jetted by wrapping slurry through the lower nozzle;
(2) When the diameter of the designed rotary jet pile is 1001mm to 2500mm, cement slurry or water enters an upper nozzle from an upper slurry channel, the jet pressure is controlled to be 30MPa to 40MPa, the jet diameter is 1/3~2/3 of the designed diameter, the cement slurry enters a driving connecting rod from a lower slurry channel, enters a hose from the driving connecting rod and is jetted from a lower nozzle, the jet pressure is controlled to be 35MPa to 45MPa, hydraulic oil or water is input into a sealing cavity formed between the driving connecting rod and the lower slurry channel from a high-pressure medium channel, the pushing pressure of the hydraulic oil or water on the driving connecting rod is 35MPa to 45MPa, the pushing pressure of the hydraulic oil or water on the driving connecting rod is reduced, so that the slurry pressure pushes the driving connecting rod to move downwards, meanwhile, the extending distance of the lower nozzle is calculated through the consumption of hydraulic oil, when the moving distance is 30cm to 50cm, the pushing pressure of the hydraulic oil or water on the driving connecting rod is restored to 35MPa to 45MPa, the driving connecting rod keeps balance under the combined action of the hydraulic oil or the water and the slurry pressure, the position of the lower nozzle is kept unchanged at 30cm to 50cm, high-pressure gas in the whole process enters an upper air chamber through a gas channel, part of the high-pressure gas in the upper air chamber is sprayed out through the slurry wrapped by the upper nozzle, part of the high-pressure gas enters a lower air chamber through a vent hole in a partition plate, and the high-pressure gas in the lower air chamber enters a hose through a lower air channel and is sprayed out through the slurry wrapped by the lower nozzle;
(3) When the diameter of the rotary jet pile is designed to be 2501mm to 3000mm, cement slurry or water enters an upper nozzle from an upper slurry channel, the jet pressure is controlled to be 30MPa to 45MPa, the jet diameter is 1/3~2/3 of the designed diameter, the cement slurry enters a driving connecting rod from a lower slurry channel, enters a hose from the driving connecting rod and is jetted from a lower nozzle, the jet pressure is controlled to be 40MPa to 70MPa, hydraulic oil or water is not input into a sealing cavity formed between the driving connecting rod and the lower slurry channel from a high-pressure medium channel, the slurry pressure pushes the driving connecting rod to move downwards, the driving connecting rod stops moving when a sealing ring at the upper end part of the driving connecting rod and a sealing ring of the lower slurry channel are in mutual contact limitation, the lower nozzle extends for 800mm to 1000mm and is continuously jetted at the position, high-pressure gas enters an upper air chamber through a gas channel in the whole process, part of the high-pressure gas in the upper air chamber wraps the jet slurry and then enters a lower air chamber, and then passes through a lower air vent hole to wrap the slurry and then to wrap the slurry;
step three: completion of construction
Lifting the horizontal telescopic rotary spraying drill rod to the ground, stopping slurry supply to the upper slurry channel when the upper nozzle is 0.5m to 0.3m away from the ground, stopping slurry supply to the lower slurry channel when the lower nozzle is 0.5m to 0.3m away from the ground, and simultaneously adjusting the pressure of a medium in the high-pressure medium channel, wherein the specific adjustment method comprises the following steps:
(1) When the diameter of the rotary jet grouting pile is designed to be 400mm to 1000mm and slurry supply to the lower slurry channel is stopped, hydraulic oil or water enters a sealed cavity formed between the driving connecting rod and the lower slurry channel from the high-pressure medium channel, the pushing pressure of the hydraulic oil or water to the driving connecting rod is reduced to be 1MPa to 2MPa from 20MPa to 35MPa, after the drill rod main body is completely lifted to the ground, the supply of the hydraulic oil or water is stopped, and the supply of high-pressure gas is stopped at the same time;
(2) When the diameter of the jet grouting pile is designed to be 1001mm to 2500mm and slurry supply to the lower slurry channel is stopped, hydraulic oil or water enters a sealed cavity formed between the driving connecting rod and the lower slurry channel from the high-pressure medium channel, the pushing pressure of the hydraulic oil or water to the driving connecting rod is reduced to be 1MPa to 2MPa from 35MPa to 45MPa, after the drill rod main body is completely lifted to the ground, supply of the hydraulic oil or water is stopped, and meanwhile supply of high-pressure gas is stopped;
(3) When the diameter of the jet grouting pile is designed to be 2501mm to 3000mm and slurry supply to the lower slurry channel is stopped, hydraulic oil or water enters a sealed cavity formed between the driving connecting rod and the lower slurry channel from the high-pressure medium channel, the pushing pressure of the hydraulic oil or water to the driving connecting rod is 1MPa to 2MPa, after the drill rod main body is completely lifted to the ground, supply of the hydraulic oil or water is stopped, and meanwhile supply of high-pressure gas is stopped.
The invention has the following beneficial technical effects:
the construction of small pile diameter is realized by arranging two nozzle positions of an upper nozzle and a lower nozzle and adjusting the injection pressure of the two nozzles, the peripheral soil body is firstly injected by the upper nozzle to form a loose space, and then the lower nozzle extends out of the critical position of the loose space, so that the aperture of the peripheral soil body is crushed by the relay of the upper nozzle and the lower nozzle, and the construction of large pile diameter is realized.
Drawings
FIG. 1 is a schematic cross-sectional view of a horizontal telescopic jet grouting drill rod and a drill rod in a construction method thereof.
FIG. 2 is a structural front view of a horizontal telescopic jet grouting drill rod and a drill rod in the construction method thereof.
FIG. 3 is a cross-sectional view of a horizontal telescopic jet grouting drill rod and a construction method thereof, wherein a lower nozzle is contracted.
FIG. 4 is a cross-sectional view of the drill rod when the lower nozzle is extended in the horizontal telescopic jet grouting drill rod and the construction method thereof.
FIG. 5 is a top view of the horizontal telescopic jet grouting drill rod and the construction method thereof.
FIG. 6 is a schematic sectional view of an upper nozzle in the horizontal telescopic rotary spray drill rod and its construction method of the present invention.
FIG. 7 is a schematic structural diagram of a horizontal telescopic jet grouting drill rod and a hose in the construction method thereof.
FIG. 8 is a cross-sectional cut-away schematic view of a hose in the horizontal telescopic jet grouting drill rod and the construction method thereof.
The drill rod comprises a drill rod body 1, a cover plate 2, a cover plate 3, a cover plate bolt 4, an upper nozzle 5, a lower nozzle 6, an upper slurry channel 7, a lower slurry channel 8, a gas channel 9, a high-pressure medium channel 10, a connecting bolt hole 11, an upper air chamber 11, a lower air chamber 12, a partition plate 13, a high-pressure pipe joint 14, a hose 15, a driving connecting rod 16, an air vent 17, a guide roller 18 and a lower air passage 19.
Detailed Description
The invention is described in further detail below with reference to the following figures and detailed description:
example 1:
as shown in fig. 1~8, a horizontal telescopic rotary spraying drill rod comprises a drill rod body 1, a cover plate 2, a cover plate bolt 3, an upper nozzle 4, a lower nozzle 5, an upper slurry channel 6, a lower slurry channel 7, a gas channel 8, a high-pressure medium channel 9, a connecting bolt hole 10, an upper air chamber 11, a lower air chamber 12, a partition plate 13, a high-pressure pipe joint 14, a hose 15, a driving connecting rod 16, a vent hole 17, a guide roller 18 and a lower air passage 19; the drill rod main body 1 is connected with the cover plate 2 through a cover plate bolt 3, and a sealing ring is arranged between the cover plate 2 and the cover plate bolt 3; an upper slurry channel 6, a lower slurry channel 7 and a gas channel 8 are arranged in the drill rod main body 1, an upper nozzle 4 and a lower nozzle 5 are arranged on the surface of the drill rod main body 1, the upper slurry channel 6 is communicated with the upper nozzle 4, the lower slurry channel 7 is communicated with the lower nozzle 5, the gas channel 8 is communicated with an upper air chamber 11, the upper air chamber 11 is communicated with the upper nozzle 4, a partition plate 13 is arranged between the upper air chamber 11 and a lower air chamber 12, the partition plate 13 is welded with the drill rod main body 1, a vent hole 17 is arranged on the partition plate 13, the upper air chamber 11 is communicated with the lower air chamber 12 through the vent hole 17, and the lower air chamber 12 is communicated with a lower gas channel 19; the hose 15 is connected with a driving connecting rod 16 through a high-pressure pipe joint 14, the hose 15 is communicated with the lower nozzle 5, the driving connecting rod 16 is inserted into the lower slurry channel 7, the upper end part of the driving connection is provided with a sealing ring, the lower end part of the lower slurry channel 7 is provided with a sealing ring, and the high-pressure medium channel 9 is connected with a sealing cavity formed between the driving connecting rod 16 and the lower slurry channel 7; a fixed shaft of the guide roller 18 is welded with the drill rod body 1, the guide roller 18 is connected with the fixed shaft through a bearing, and the hose 15 penetrates between the two guide rollers 18; the upper end part of the drill rod main body 1 is provided with a connecting bolt hole 10.
Preferably, the width of the cover plate 2 is half of that of the drill rod body 1, the length of the cover plate 2 is 1/2~2/3 of the drill rod body 1, and two ends of the cover plate 2 are in an oblique angle structure.
Preferably, the upper slurry channel 6 and the lower slurry channel 7 are both rigid structures, the sealing ring at the lower end of the lower slurry channel 7 is in close contact with the outer wall of the driving connection, and the sealing ring at the upper end of the driving connecting rod 16 is in close contact with the inner wall of the lower slurry channel 7.
Preferably, the medium flowing in the high-pressure medium passage 9 is water or hydraulic oil.
Preferably, the hose 15 is a double-layer tubular structure, a slurry passage is arranged in the middle of the hose 15, a lower air passage 19 is arranged between the slurry passage and the outer wall of the hose 15, the lower air passage 19 is of a quincunx structure, the lower air passage 19 is divided into five parts, the five parts are not communicated with each other, and high-pressure gas in the lower air chamber 12 is converged at the lower nozzle 5 through the lower air passage 19 and is sprayed.
A construction method of a horizontal telescopic rotary spraying drill rod is adopted for construction, and the construction method comprises the following specific steps:
the method comprises the following steps: hole guiding construction
Adopting a hole guiding drilling machine to carry out hole guiding construction on the designed pile position;
step two: lifting by rotary spraying
Put into the induction hole with the telescopic jet grouting drilling rod of level to sink to the hole bottom, promote the drilling rod gradually, the in-process that promotes the drilling rod is adjusted the position of nozzle 5 down according to the design stake footpath, specifically as follows:
(1) When the diameter of the designed rotary jet pile is 400mm to 1000mm, cement slurry or water enters the upper nozzle 4 from the upper slurry channel 6, the jet pressure is controlled to be 20MPa to 35MPa, the cement slurry enters the driving connecting rod 16 from the lower slurry channel 7, enters the hose 15 from the driving connecting rod 16 and is jetted from the lower nozzle 5, the jet pressure is controlled to be 20MPa to 35MPa, hydraulic oil or water enters a sealed cavity formed between the driving connecting rod 16 and the lower slurry channel 7 from the high-pressure medium channel 9, the pushing pressure of the hydraulic oil or the water on the driving connecting rod 16 is 20MPa to 35MPa, the driving connecting rod 16 keeps balance under the combined action of the hydraulic oil and the slurry pressure, the position of the lower nozzle 5 is unchanged, the high-pressure gas enters the upper air chamber 11 through the gas channel 8 in the whole process, part of the high-pressure gas in the upper air chamber 11 is wrapped by the upper nozzle 4 and jetted by the slurry, part of the high-pressure gas enters the lower air chamber 12 through the vent 17 on the partition plate 13, and the high-pressure gas in the lower air chamber 12 enters the hose 15 and then is wrapped by the lower nozzle 5 and jetted by the slurry;
(2) When the diameter of the designed rotary jet pile is 1001mm to 2500mm, cement slurry or water enters the upper nozzle 4 from the upper slurry channel 6, the jet pressure is controlled to be 30MPa to 40MPa, the jet diameter is 1/3~2/3 of the designed diameter, the cement slurry enters the driving connecting rod 16 from the lower slurry channel 7, enters the hose 15 from the driving connecting rod 16 and is jetted from the lower nozzle 5, the jet pressure is controlled to be 35MPa to 45MPa, hydraulic oil or water is input into a sealing cavity formed between the driving connecting rod 16 and the lower slurry channel 7 from the high-pressure medium channel 9, the pushing pressure of the hydraulic oil or water to the driving connecting rod 16 is 35MPa to 45MPa, the pushing pressure of the hydraulic oil or water to the driving connecting rod 16 is reduced, so that the slurry pressure pushes the driving connecting rod 16 to move downwards, meanwhile, the extending distance of the lower nozzle 5 is calculated through the consumption of hydraulic oil, when the moving distance is 30cm to 50cm, the pushing pressure of the hydraulic oil or water on the driving connecting rod 16 is restored to 35MPa to 45MPa, the driving connecting rod 16 keeps balance under the combined action of the hydraulic oil or water and the pressure of slurry, the position of the lower nozzle 5 is kept within 30cm to 50cm unchanged, high-pressure gas enters the upper air chamber 11 through the gas channel 8 in the whole process, part of the high-pressure gas in the upper air chamber 11 is sprayed out by the slurry wrapped by the upper nozzle 4, part of the high-pressure gas enters the lower air chamber 12 through the vent hole 17 in the partition plate 13, and the high-pressure gas in the lower air chamber 12 enters the hose 15 through the lower air passage 19 and is sprayed out by the slurry wrapped by the lower nozzle 5;
(3) When the designed jet grouting pile diameter is 2501mm to 3000mm, cement slurry or water enters an upper nozzle 4 from an upper slurry channel 6, the jet pressure is controlled to be 30MPa to 45MPa, the jet diameter is 1/3~2/3 of the designed diameter, the cement slurry enters a driving connecting rod 16 from a lower slurry channel 7, enters a hose 15 from the driving connecting rod 16 and is jetted from a lower nozzle 5, the jet pressure is controlled to be 40MPa to 70MPa, hydraulic oil or water is not input into a sealing cavity formed between the driving connecting rod 16 and the lower slurry channel 7 from a high-pressure medium channel 9, the slurry pressure pushes the driving connecting rod 16 to move downwards, the driving connecting rod 16 stops moving when a sealing ring at the upper end of the driving connecting rod 16 is in contact limitation with a sealing ring of the lower slurry channel 7, the lower nozzle 5 extends out for a length of 800mm to 1000mm and is continuously jetted at the position, high-pressure gas enters an upper air chamber 11 through an air channel 8 in the whole process, a part of the high-pressure gas in the air chamber 11 is jetted out through an upper nozzle 4 to wrap a partition plate, a part of the air chamber, and further passes through a lower nozzle 13 to enter a lower nozzle 12, and then passes through a lower nozzle 12 to be jetted into a lower nozzle 15, and further passes through a lower nozzle 15 and is jetted from a lower air channel 12 to enter a lower air outlet of the lower slurry channel 12 to be jetted from a lower nozzle;
step three: completion of construction
Lifting the horizontal telescopic rotary spraying drill rod to the ground, stopping slurry supply to the upper slurry channel 6 when the upper nozzle 4 is 0.5m to 0.3m away from the ground, stopping slurry supply to the lower slurry channel 7 when the lower nozzle 5 is 0.5m to 0.3m away from the ground, and simultaneously adjusting the pressure of a medium in the high-pressure medium channel 9, wherein the specific adjusting method comprises the following steps:
(1) When the diameter of the rotary jet grouting pile is designed to be 400mm to 1000mm and slurry supply to the lower slurry channel 7 is stopped, hydraulic oil or water enters a sealed cavity formed between the driving connecting rod 16 and the lower slurry channel 7 from the high-pressure medium channel 9, the pushing pressure of the hydraulic oil or water to the driving connecting rod 16 is reduced to be 1MPa to 2MPa from 20MPa to 35MPa, after the drill rod main body 1 is completely lifted to the ground, the supply of the hydraulic oil or water is stopped, and the supply of high-pressure gas is stopped at the same time;
(2) When the diameter of the rotary jet grouting pile is designed to be 1001mm to 2500mm and slurry supply to the lower slurry channel 7 is stopped, hydraulic oil or water enters a sealed cavity formed between the driving connecting rod 16 and the lower slurry channel 7 from the high-pressure medium channel 9, the pushing pressure of the hydraulic oil or water to the driving connecting rod 16 is reduced to be 1MPa to 2MPa from 35MPa to 45MPa, after the drill rod main body 1 is completely lifted to the ground, the supply of the hydraulic oil or water is stopped, and the supply of high-pressure gas is stopped at the same time;
(3) When the diameter of the rotary jet pile is designed to be 2501mm to 3000mm and slurry supply to the lower slurry channel 7 is stopped, hydraulic oil or water enters a sealed cavity formed between the driving connecting rod 16 and the lower slurry channel 7 from the high-pressure medium channel 9, the pushing pressure of the hydraulic oil or water to the driving connecting rod 16 is 1MPa to 2MPa, the supply of the hydraulic oil or water is stopped after the drill rod main body 1 is completely lifted to the ground, and the supply of high-pressure gas is stopped at the same time.
Example 2:
as shown in 1~8, the construction is carried out under the geological condition that soft clay is rich, the pile diameter is designed to be 2.5m, and the pile depth is 68m, and the horizontal telescopic jet grouting drill rod and the construction method thereof provided by the invention are adopted to carry out the following construction:
the method comprises the following steps: hole guiding construction
Adopting a hole guiding drilling machine to carry out hole guiding construction on the designed pile position;
step two: lifting by rotary spraying
Put into the induction hole with the telescopic jet grouting drilling rod of level to sink to the hole bottom, promote the drilling rod gradually, the in-process that promotes the drilling rod is adjusted the position of nozzle 5 down according to the design stake footpath, specifically as follows:
designing the diameter of a rotary spraying pile to be 2500mm, starting a grouting pump connected with an upper nozzle 4, enabling cement slurry to enter the upper nozzle 4 from an upper slurry channel 6, controlling the spraying pressure to be 35MPa, enabling the spraying diameter to be 1/3~2/3 of the designed diameter, enabling soil bodies within 50cm of the periphery of a drill rod to be disturbed at the moment, forming a slurry-soil mixture with the sprayed slurry, starting the grouting pump connected with a lower nozzle 5, enabling the pressure of the grouting pump to be 45MPa, simultaneously starting a hydraulic oil pump station or a water injection high-pressure pump connected with a high-pressure medium channel 9, ensuring that the pressure is 45MPa, gradually reducing the pressure of the hydraulic oil pump station or the water injection high-pressure pump, enabling a driving connecting rod 16 to receive downward pressure due to pressure difference, forcing the driving connecting rod to move downwards, further driving a hose 15 and the lower nozzle 5 to move, enabling the hose 15 to be bent under the action of a guide roller 18, and converting the downward movement of the hose 15 into horizontal movement, and further driving the lower nozzle 5 to move horizontally.
The volume of hydraulic oil or water entering a sealed cavity formed between a driving connecting rod 16 and a lower slurry channel 7 is measured, the extending distance of a lower nozzle 5 is calculated, when the extending distance of the lower nozzle 5 is 40cm, the pressure of a hydraulic oil pump station or a water injection high-pressure pump is restored to be 45MPa, at the moment, the driving connecting rod 16 keeps balance under the combined action of the hydraulic oil or the water and the slurry pressure, the position of the lower nozzle 5 is kept unchanged at 40cm for continuous injection, at the moment, because high-pressure gas and high-pressure slurry exist in a hose 15, the hose 15 extending out of a drill rod main body 1 keeps rigidity, because the upper nozzle 4 disturbs soil within 50cm, the hose 15 cannot be subjected to large resistance when rotating, and after the hose 15 extends for 40cm, the peripheral soil is continuously injected at the pressure of 45MPa, so that the soil is more directly crushed, the crushed diameter is larger, and the crushed pile diameter reaches 2500mm. In the whole process, high-pressure gas enters the upper air chamber 11 through the gas channel 8, part of the high-pressure gas in the upper air chamber 11 is sprayed out by wrapping slurry through the upper nozzle 4, part of the high-pressure gas enters the lower air chamber 12 through the vent hole 17 in the partition plate 13, and the high-pressure gas in the lower air chamber 12 enters the hose 15 through the lower air channel 19 and is sprayed out by wrapping slurry through the lower nozzle 5.
Step three: completion of construction
Lifting the horizontal telescopic rotary spraying drill rod to the ground, stopping slurry supply to the upper slurry channel 6 when the upper nozzle 4 is 0.4m away from the ground, stopping slurry supply to the lower slurry channel 7 when the lower nozzle 5 is 0.4m away from the ground, and simultaneously adjusting the pressure of a medium in the high-pressure medium channel 9, wherein the specific adjustment method comprises the following steps:
the diameter of the rotary spraying pile is designed to be 2500mm, when slurry supply to the lower slurry channel 7 is stopped, hydraulic oil or water enters a sealing cavity formed between the driving connecting rod 16 and the lower slurry channel 7 from the high-pressure medium channel 9, the pushing pressure of the hydraulic oil or water to the driving connecting rod 16 is reduced to 1MPa from 45MPa, the supply of the hydraulic oil or water is stopped after the drill rod main body 1 is completely lifted to the ground, and the supply of high-pressure gas is stopped at the same time.
The invention relates to a horizontal telescopic rotary spraying drill rod and a construction method thereof.A small pile diameter construction is realized by arranging two nozzle positions of an upper nozzle 4 and a lower nozzle 5 and adjusting the spraying pressure of the two nozzles, a peripheral soil body is sprayed in advance through the upper nozzle 4 to form a loose space, and then the lower nozzle 5 is extended to the critical position of the loose space, so that the upper nozzle 5 and the lower nozzle 5 realize the aperture crushing of the peripheral soil body under the relay, and further the large pile diameter construction is realized.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (6)
1. A horizontal telescopic rotary spraying drill rod is characterized by comprising a drill rod main body, a cover plate bolt, an upper nozzle, a lower nozzle, an upper slurry channel, a lower slurry channel, a gas channel, a high-pressure medium channel, a connecting bolt hole, an upper air chamber, a lower air chamber, a partition plate, a high-pressure pipe joint, a hose, a driving connecting rod, an air vent, a guide roller and a lower air passage; the drill rod main body is connected with the cover plate through a cover plate bolt, and a sealing ring is arranged between the cover plate and the cover plate bolt; an upper slurry channel, a lower slurry channel and a gas channel are arranged in the drill rod main body, an upper nozzle and a lower nozzle are arranged on the surface of the drill rod main body, the upper slurry channel is communicated with the upper nozzle, the lower slurry channel is communicated with the lower nozzle, the gas channel is communicated with an upper air chamber, the upper air chamber is communicated with the upper nozzle, a partition plate is arranged between the upper air chamber and the lower air chamber, the partition plate is welded with the drill rod main body, an air hole is formed in the partition plate, the upper air chamber is communicated with the lower air chamber through the air hole, and the lower air chamber is communicated with the lower air channel; the hose is connected with a driving connecting rod through a high-pressure pipe joint, the hose is communicated with the lower nozzle, the driving connecting rod is inserted into the lower slurry channel, the upper end part of the driving connection is provided with a sealing ring, the lower end part of the lower slurry channel is provided with a sealing ring, and the high-pressure medium channel is connected with a sealing cavity formed between the driving connecting rod and the lower slurry channel; a fixed shaft of the guide roller is welded with the drill rod main body, the guide roller is connected with the fixed shaft through a bearing, and a hose penetrates between the two guide rollers; the upper end part of the drill rod main body is provided with a connecting bolt hole.
2. The horizontal telescopic jet grouting drill pipe as claimed in claim 1, wherein the width of the cover plate is half of the drill pipe body, the length of the cover plate is 1/2~2/3 of the drill pipe body, and two ends of the cover plate are in an oblique angle structure.
3. The horizontal telescopic jet grouting drill rod as claimed in claim 1, wherein the upper slurry channel and the lower slurry channel are both rigid structures, a sealing ring at the lower end part of the lower slurry channel is in close contact with the outer wall of the driving connection, and a sealing ring at the upper end part of the driving connecting rod is in close contact with the inner wall of the lower slurry channel.
4. The horizontal telescopic jet grouting drill rod as claimed in claim 1, wherein the flowing medium in the high-pressure medium channel is water or hydraulic oil.
5. The horizontal telescopic rotary spraying drill rod as claimed in claim 1, wherein the hose is of a double-layer tubular structure, a slurry channel is arranged in the middle of the hose, a lower air passage is arranged between the slurry channel and the outer wall of the hose, the lower air passage is of a quincunx structure and is divided into five parts, the five parts are not communicated with each other, and high-pressure gas in the lower air chamber is converged at the lower nozzle through the lower air passage and is sprayed.
6. A construction method of a horizontal telescopic rotary spraying drill rod is characterized in that the construction is carried out by adopting the horizontal telescopic rotary spraying drill rod of claim 1, and the specific construction steps are as follows:
the method comprises the following steps: hole guiding construction
Adopting a hole guiding drilling machine to carry out hole guiding construction on the designed pile position;
step two: lifting by rotary spraying
Put into the induction hole with the telescopic jet grouting drilling rod of level to sink to the hole bottom, promote the drilling rod gradually, the in-process that promotes the drilling rod is adjusted the position of nozzle down according to the design stake footpath, specifically as follows:
(1) When the diameter of the rotary jet pile is designed to be 400mm to 1000mm, cement slurry or water enters an upper nozzle from an upper slurry channel, the injection pressure is controlled to be 20MPa to 35MPa, the cement slurry enters a driving connecting rod from a lower slurry channel, enters a hose from the driving connecting rod and is jetted from a lower nozzle, the injection pressure is controlled to be 20MPa to 35MPa, hydraulic oil or water enters a sealed cavity formed between the driving connecting rod and the lower slurry channel from a high-pressure medium channel, the pushing pressure of the hydraulic oil or the water to the driving connecting rod is 20MPa to 35MPa, the driving connecting rod keeps balance under the combined action of the hydraulic oil and the slurry pressure, the position of the lower nozzle is unchanged, high-pressure gas in the whole process enters an upper air chamber through a gas channel, part of the high-pressure gas in the upper air chamber is jetted by wrapping the slurry through the upper nozzle, part of the high-pressure gas in a partition plate enters a lower air chamber through a vent hole in a partition plate, and the high-pressure gas in the lower air chamber enters the hose through a lower air channel and is further jetted by wrapping slurry through the lower nozzle;
(2) When the diameter of the designed rotary jet pile is 1001mm to 2500mm, cement slurry or water enters an upper nozzle from an upper slurry channel, the jet pressure is controlled to be 30MPa to 40MPa, the jet diameter is 1/3~2/3 of the designed diameter, the cement slurry enters a driving connecting rod from a lower slurry channel, enters a hose from the driving connecting rod and is jetted from a lower nozzle, the jet pressure is controlled to be 35MPa to 45MPa, hydraulic oil or water is input into a sealing cavity formed between the driving connecting rod and the lower slurry channel from a high-pressure medium channel, the pushing pressure of the hydraulic oil or water on the driving connecting rod is 35MPa to 45MPa, the pushing pressure of the hydraulic oil or water on the driving connecting rod is reduced, so that the slurry pressure pushes the driving connecting rod to move downwards, meanwhile, the extending distance of the lower nozzle is calculated through the consumption of hydraulic oil, when the moving distance is 30cm to 50cm, the pushing pressure of the hydraulic oil or water on the driving connecting rod is restored to 35MPa to 45MPa, the driving connecting rod keeps balance under the combined action of the hydraulic oil or the water and the slurry pressure, the position of the lower nozzle is kept unchanged at 30cm to 50cm, high-pressure gas in the whole process enters an upper air chamber through a gas channel, part of the high-pressure gas in the upper air chamber is sprayed out through the slurry wrapped by the upper nozzle, part of the high-pressure gas enters a lower air chamber through a vent hole in a partition plate, and the high-pressure gas in the lower air chamber enters a hose through a lower air channel and is sprayed out through the slurry wrapped by the lower nozzle;
(3) When the diameter of the rotary jet pile is designed to be 2501mm to 3000mm, cement slurry or water enters an upper nozzle from an upper slurry channel, the jet pressure is controlled to be 30MPa to 45MPa, the jet diameter is 1/3~2/3 of the designed diameter, the cement slurry enters a driving connecting rod from a lower slurry channel, enters a hose from the driving connecting rod and is jetted from a lower nozzle, the jet pressure is controlled to be 40MPa to 70MPa, hydraulic oil or water is not input into a sealing cavity formed between the driving connecting rod and the lower slurry channel from a high-pressure medium channel, the slurry pressure pushes the driving connecting rod to move downwards, the driving connecting rod stops moving when a sealing ring at the upper end part of the driving connecting rod and a sealing ring of the lower slurry channel are in mutual contact limitation, the lower nozzle extends for 800mm to 1000mm and is continuously jetted at the position, high-pressure gas enters an upper air chamber through a gas channel in the whole process, part of the high-pressure gas in the upper air chamber wraps the jet slurry and then enters a lower air chamber, and then passes through a lower air vent hole to wrap the slurry and then to wrap the slurry;
step three: the construction is finished
Lifting the horizontal telescopic rotary spraying drill rod to the ground, stopping slurry supply to the upper slurry channel when the upper nozzle is 0.5m to 0.3m away from the ground, stopping slurry supply to the lower slurry channel when the lower nozzle is 0.5m to 0.3m away from the ground, and simultaneously adjusting the pressure of a medium in the high-pressure medium channel, wherein the specific adjustment method comprises the following steps:
(1) When the diameter of the rotary jet grouting pile is designed to be 400mm to 1000mm and slurry supply to the lower slurry channel is stopped, hydraulic oil or water enters a sealed cavity formed between the driving connecting rod and the lower slurry channel from the high-pressure medium channel, the pushing pressure of the hydraulic oil or water to the driving connecting rod is reduced to be 1MPa to 2MPa from 20MPa to 35MPa, after the drill rod main body is completely lifted to the ground, the supply of the hydraulic oil or water is stopped, and the supply of high-pressure gas is stopped at the same time;
(2) When the diameter of the jet grouting pile is designed to be 1001mm to 2500mm and slurry supply to the lower slurry channel is stopped, hydraulic oil or water enters a sealed cavity formed between the driving connecting rod and the lower slurry channel from the high-pressure medium channel, the pushing pressure of the hydraulic oil or water to the driving connecting rod is reduced to be 1MPa to 2MPa from 35MPa to 45MPa, after the drill rod main body is completely lifted to the ground, supply of the hydraulic oil or water is stopped, and meanwhile supply of high-pressure gas is stopped;
(3) When the diameter of the rotary jet pile is designed to be 2501mm to 3000mm and slurry supply to the lower slurry channel is stopped, hydraulic oil or water enters a sealed cavity formed between the driving connecting rod and the lower slurry channel from the high-pressure medium channel, the pushing pressure of the hydraulic oil or water to the driving connecting rod is 1MPa to 2MPa, the supply of the hydraulic oil or water is stopped after the drill rod main body is completely lifted to the ground, and the supply of high-pressure gas is stopped at the same time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211191679.8A CN115450567B (en) | 2022-09-28 | 2022-09-28 | Construction method of horizontal telescopic rotary spraying drill rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211191679.8A CN115450567B (en) | 2022-09-28 | 2022-09-28 | Construction method of horizontal telescopic rotary spraying drill rod |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115450567A true CN115450567A (en) | 2022-12-09 |
| CN115450567B CN115450567B (en) | 2024-07-23 |
Family
ID=84306102
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211191679.8A Active CN115450567B (en) | 2022-09-28 | 2022-09-28 | Construction method of horizontal telescopic rotary spraying drill rod |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115450567B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101235640A (en) * | 2008-02-28 | 2008-08-06 | 上海市第二市政工程有限公司 | Fourfold pipe stratum decompression type double-liquor rotary spraying construction method |
| CN102418344A (en) * | 2011-06-17 | 2012-04-18 | 北京荣创科宏岩土工程有限公司 | Injector, drill bit combination structure and combination drilling tool |
| CN203174588U (en) * | 2013-02-17 | 2013-09-04 | 广州市吉特高喷灌浆工程有限公司 | Device capable of forming high-strength jet grouting piles in silt layer |
| CN105386727A (en) * | 2015-12-15 | 2016-03-09 | 重庆九州探矿机械技术开发公司 | Jet-grouting drilling rig and double-tube jet-grouting drilling bit thereof |
| US20160160568A1 (en) * | 2011-08-05 | 2016-06-09 | Coiled Tubing Specialties, Llc | Steerable Hydraulic Jetting Nozzle, and Guidance System for Downhole Boring Device |
| CN113250620A (en) * | 2021-06-22 | 2021-08-13 | 无锡市安曼工程机械有限公司 | Drilling tool connecting sleeve and triple jet drilling tool |
-
2022
- 2022-09-28 CN CN202211191679.8A patent/CN115450567B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101235640A (en) * | 2008-02-28 | 2008-08-06 | 上海市第二市政工程有限公司 | Fourfold pipe stratum decompression type double-liquor rotary spraying construction method |
| CN102418344A (en) * | 2011-06-17 | 2012-04-18 | 北京荣创科宏岩土工程有限公司 | Injector, drill bit combination structure and combination drilling tool |
| US20160160568A1 (en) * | 2011-08-05 | 2016-06-09 | Coiled Tubing Specialties, Llc | Steerable Hydraulic Jetting Nozzle, and Guidance System for Downhole Boring Device |
| CN203174588U (en) * | 2013-02-17 | 2013-09-04 | 广州市吉特高喷灌浆工程有限公司 | Device capable of forming high-strength jet grouting piles in silt layer |
| CN105386727A (en) * | 2015-12-15 | 2016-03-09 | 重庆九州探矿机械技术开发公司 | Jet-grouting drilling rig and double-tube jet-grouting drilling bit thereof |
| CN113250620A (en) * | 2021-06-22 | 2021-08-13 | 无锡市安曼工程机械有限公司 | Drilling tool connecting sleeve and triple jet drilling tool |
Non-Patent Citations (1)
| Title |
|---|
| 陈国辉;庞双喜;: "高压旋喷桩施工技术探析", 科技创新与应用, no. 20, 18 July 2013 (2013-07-18) * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115450567B (en) | 2024-07-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101962949B (en) | Long spiral double-pipe high-pressure stir-jet grouting pile construction method and device | |
| CN106996105B (en) | Down-the-hole impact jet grouting stirring pile construction technology and equipment | |
| CN112253162B (en) | Water-rich sand layer large-diameter jacking pipe group entrance and exit reinforcing structure and construction method | |
| CN102605773B (en) | Construction method of slip-casting expanded-base cast-in-situ bored pile and extruding-extending device thereof | |
| CN203769805U (en) | Grouting blowout prevention system for eliminating underwater shield liquefied soil layer | |
| CN111364532B (en) | Existing pile foundation reinforcement method based on slurry control | |
| CN111501741A (en) | Waterproof curtain stirring jet grouting construction drilling tool, construction device and method | |
| CN111622217A (en) | Grouting precast tubular pile after rotary spraying construction and construction process thereof | |
| CN212001095U (en) | Old pile removing sleeve based on walking type pile machine | |
| CN102926409A (en) | Construction method for preventing water and soil loss | |
| CN101182710A (en) | Spray grouting method and spray grouting boring tool | |
| CN111364449A (en) | Construction method and structure for penetrating karst cave of precast tubular pile | |
| CN113718752A (en) | Ground diaphragm wall composite grouting method and grouting structure | |
| CN115450567A (en) | Horizontal telescopic rotary spraying drill rod and construction method thereof | |
| CN116876486A (en) | Free angle soft soil foundation reinforcement construction equipment, construction method and reinforcement pile | |
| CN111188638A (en) | Advanced support pipe shed structure under silty-fine sand geological condition and construction method thereof | |
| CN207161107U (en) | Multistage densification formula mini-valve tube | |
| CN206337558U (en) | A kind of triple tube injector combination unit | |
| CN202543908U (en) | Extruding and enlarging device of slip casting enlarged cast-in-situ bored pile | |
| CN213625557U (en) | Double-liquid triple-pipe high-pressure rotary spraying construction device and system | |
| CN115522540A (en) | Construction method of high-pressure jet grouting pile in water-rich flowing sand layer geology | |
| KR100463104B1 (en) | Pillar-shaped hardening structure formation equipment and the formation method of leading cement milk pressure injection | |
| CN203960881U (en) | The inner pressure-bearing dewatering well of foundation ditch steel sleeve flange connecting apparatus | |
| CN113073669A (en) | Pile wall leakage stopping structure for gravel stratum SMW construction method and construction method | |
| CN201089899Y (en) | Orientation pressure-control apparatus for horizontal rotary spraying pile |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |