CN114151012A - Jet grouting pile expanding and jet grouting assisting construction and pile diameter detection method - Google Patents
Jet grouting pile expanding and jet grouting assisting construction and pile diameter detection method Download PDFInfo
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- CN114151012A CN114151012A CN202111482276.4A CN202111482276A CN114151012A CN 114151012 A CN114151012 A CN 114151012A CN 202111482276 A CN202111482276 A CN 202111482276A CN 114151012 A CN114151012 A CN 114151012A
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- 238000010276 construction Methods 0.000 title claims abstract description 32
- 238000001514 detection method Methods 0.000 title claims abstract description 13
- 238000005507 spraying Methods 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000002002 slurry Substances 0.000 claims description 20
- 238000003756 stirring Methods 0.000 claims description 10
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 5
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims 1
- 238000011897 real-time detection Methods 0.000 abstract description 3
- 238000005070 sampling Methods 0.000 abstract description 2
- 239000002689 soil Substances 0.000 description 5
- 238000007789 sealing Methods 0.000 description 4
- 239000011440 grout Substances 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 239000004568 cement Substances 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
- 239000007788 liquid Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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Classifications
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- 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
- E21B7/28—Enlarging drilled holes, e.g. by counterboring
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- 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
- 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
-
- 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
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
- E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
- E21B10/322—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools cutter shifted by fluid pressure
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Piles And Underground Anchors (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
The invention discloses a method for expanding and assisting in spraying construction and pile diameter detection of a jet grouting pile. Designing an expanding and jetting-assisting interval according to the pile diameter, utilizing an expanding and jetting-assisting device as a pile diameter detection means before pile forming, and directly carrying out re-jetting after expanding on the section if the sampling position fails to meet the pile diameter requirement, thereby improving the pile forming quality, and carrying out real-time detection and processing while ensuring the construction efficiency of the jet grouting pile; the invention can obviously improve the construction efficiency and the pile forming quality of the jet grouting pile.
Description
Technical Field
The invention relates to the technical field of buildings, in particular to a construction and detection method of a jet grouting pile.
Background
The jet grouting pile is characterized in that a jet grouting pipe and a nozzle drill are arranged at the designed depth of the bottom of the pile by using a drilling machine, prepared grout in advance is sprayed out from a nozzle at the edge of the grouting pipe at high speed after obtaining huge energy through a high-pressure generating device to form a stream with highly concentrated energy, a soil body is directly damaged, in the spraying process, a drill rod is lifted while rotating, so that the grout and the soil body are fully stirred and mixed, and a columnar solidification body with a certain diameter is formed in the soil, so that the foundation is reinforced.
In actual engineering, reinforced strata often have differences, the situation that the diameter of the jet grouting pile cannot meet the design requirement is very easy to occur, and the situation can not be found in time in the jet grouting pile construction process, so that the reinforced foundation can not meet the bearing capacity requirement, and economic loss and delay of construction progress are caused. Common guarantee measures in the industry often have the defects that detection lags behind construction, early preparation of synchronous detection means is complex and difficult to detect continuously, treatment means is lacked after problems are detected, and conflicts between construction quality and construction progress of the jet grouting pile are obvious. How to improve pile-forming quality, detect in real time and process in time becomes the problem which needs to be solved urgently at present while ensuring the construction efficiency of the jet grouting pile.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a method for expanding and assisting jet grouting construction and pile diameter detection of a jet grouting pile, which comprises the following operation steps:
s1: drilling by a rotary jet drill bit to a designed depth;
s2: the compression pump supplies slurry to the rotary nozzle after reaching a design pressure value;
s3: expanding the expanding jet grouting device to the designed diameter of the jet grouting pile, and keeping the jet grouting ports to perform linear jet grouting according to the designed value of the grouting pressure all the time in the expanding and contracting stages of the expanding jet grouting assisting device, so as to cut the reinforced stratum;
s4: after the expanding jet-assisted device shrinks and the jet-assisted drill bit returns to the designed pile depth, jet-assisted back to the position 2-3 times of the pile diameter according to the construction requirement;
s5: repeating the operations of expanding and assisting spraying in the step S3 and the operation of retreating in the step S4 until the last non-expanding and assisting spraying section exceeds the ground surface and stops retreating;
s6: the jet grouting drill bit extends to the middle of the first non-expanded jet grouting section again, the rotation is stopped, the expanded jet grouting assisting device is externally supported, and if the hydraulic pressure required by the external support of the expansion cylinder of the expanded jet grouting assisting device is less than 1/5 primary expansion hydraulic pressure value, the jet grouting drill bit rotates and returns to the middle of the next non-expanded jet grouting section to continue to detect the diameter of the pile body; if the expansion hydraulic pressure value exceeds 1/5 initial expansion hydraulic pressure value, after the section is expanded, the section is re-sprayed according to the construction requirement;
s7: after the diameter of each section of the pile body reaches the design requirement, the construction of the jet grouting pile is finished, and the jet grouting pile is moved to the next pile position.
In the expanding rotary jet construction, the interval of 2-3 times of the pile diameter is used as a necessary position for expanding rotary jet, and whether the diameter of the rotary jet pile in the interval range meets the design requirement is used as a measuring standard for whether the non-expanding jet-assisted pile body of the section meets the design value.
The high-pressure slurry spraying synchronous linear cutting is carried out while the rod wall of the slurry conveying rod is fully utilized to cut and destroy a reinforced stratum in a mechanical extrusion mode, a sheet-shaped vertical cutting surface is formed after diameter expansion, the cutting surface can impact the high-pressure slurry on the stratum and stir and reinforce the stratum, the cutting, stirring and reinforcing are changed into cutting, stirring and reinforcing, the energy loss of the rotary spraying slurry is greatly reduced, and a guarantee is provided for the rotary spraying radius.
And judging the expansion size of the expanding rotary spraying device according to the reading of the flow meter of the hydraulic cylinder.
The invention has the advantages that: the aperture is expanded mechanically to promote the jet grouting to contact the wall surface to generate shearing damage, the high-pressure jet grouting linearly cuts the stratum, and the jet grouting is assisted to retreat so as to realize the full stirring of the jet grouting construction on the reinforced stratum. The expanding and spray-assisting interval is designed according to the pile diameter, the expanding and spray-assisting device is used as a pile diameter detection means before the pile is formed, if the sampling position fails to meet the pile diameter requirement, the pile can be sprayed again after the expansion of the section, the pile forming quality is improved, real-time detection and timely treatment are realized while the construction efficiency of the jet grouting pile is ensured, a triangular section structure for removing attached soil is added when the expanding and spray-assisting device is designed, and clamping stagnation is prevented when the support arm returns. The construction efficiency and the pile forming quality of the jet grouting pile can be obviously improved, and the jet grouting pile has great significance to the field of foundation engineering.
Drawings
FIG. 1 is a flow chart of the present invention;
fig. 2 is a schematic structural diagram of the expanding jet-assisted device.
Detailed Description
The invention is described in detail with reference to the accompanying drawings, the structure of the expanding jet-assistant device is shown in fig. 2, a pile hole 1 is arranged in soil 2, a rotary jet pipe 3 is arranged in the pile hole 1, the upper part of the rotary jet pipe is connected with a hoisting device and a rotating device, and the lower part of the rotary jet pipe is connected with a drill bit 4; a slurry conveying pipe 5 is arranged in the rotary spraying pipe, and the slurry conveying pipe 5 is connected with a slurry spraying hole 6 of the drill bit; the invention is characterized in that: in order to clear away some barriers that can't utilize high-pressure thick liquid cutting of stake hole inner wall, the lower extreme of whirl spray tube has been improved, specifically is:
the rotary spraying pipe 3 is provided with symmetrical through holes 7, the lower end of each through hole is provided with a lower support plate 9, the upper end of each through hole is provided with an upper support plate 8, a hydraulic cylinder 10 is arranged between each upper support plate and each lower support plate, each upper support plate is connected with the piston end of the hydraulic cylinder, and each lower support plate is connected with the cylinder body of the hydraulic cylinder; the lower support plate is fixed on the inner wall of the rotary spraying pipe, so that the lower support plate and the rotary spraying pipe do not move axially; the outer side of the upper support plate is abutted against the inner wall of the rotary spraying pipe, so that the upper support plate can axially move along the inner wall of the rotary spraying pipe; the upper support plate is coupled with the two upper support arms 12 by a shaft; the lower support plate is connected with the two lower support arms 11 by a shaft, and the upper support arm and the lower support arm on the same side are connected by a shaft; therefore, the two upper support arms and the two lower support arms can be driven to move radially by the movement of the hydraulic cylinder piston, when the upper support arms and the lower support arms extend out of the through holes, the diameter of the rotary spraying pipe is enlarged, and therefore, the upper support arms and the lower support arms can be used for cutting some obstacles;
in order to detect the diameter of the pile hole at the position of the upper support arm and the lower support arm in real time, a pressure gauge and a flow meter can be arranged on a hydraulic pipeline of the hydraulic cylinder. Therefore, the extending lengths of the upper support arm and the lower support arm can be judged according to the flow meter; the pore diameter of the position can be judged according to the reading of the pressure gauge, when the pressure is overlarge, the position can be judged to have an obstacle, and when the pressure is within the pressure range in the slurry (the pressure value can be obtained in advance through an experimental method), the position is judged to have no obstacle, and the diameter of the pile hole meets the requirement.
In order to prevent cement paste and the like from flowing into the through hole during diameter expansion, the upper support plate is provided with a sealing plate 13, the lower part of the sealing plate is fixed on the upper support plate 8, and the outer side of the sealing plate is abutted against the inner wall of the through hole 7; thus, the exposed position of the through hole can be sealed by the sealing plate.
In order to prevent silt and the like from being clamped between the upper support arm and the lower support arm, so that the upper support arm and the lower support arm cannot return and an obstacle can be conveniently cut, the sections of the upper support arm and the lower support arm are triangular; therefore, debris such as silt can be pushed out through the triangular structure.
The upper support plate is disc-shaped, the excircle of the upper support plate is abutted to the inner wall of the rotary jet pipe, and the middle of the upper support plate is provided with a through hole which is sleeved on the slurry conveying pipe.
The operation steps of the invention comprise:
s1: drilling by a rotary jet drill bit to a designed depth;
s2: the compression pump supplies slurry to the rotary nozzle after reaching a design pressure value;
s3: expanding the expanding jet grouting device to the designed diameter of the jet grouting pile, and keeping the jet grouting ports to perform linear jet grouting according to the designed value of the grouting pressure all the time in the expanding and contracting stages of the expanding jet grouting assisting device, so as to cut the reinforced stratum;
s4: after the expanding jet-assisted device shrinks and the jet-assisted drill bit returns to the designed pile depth, jet-assisted back to the position 2-3 times of the pile diameter according to the construction requirement;
s5: repeating the operations of expanding and assisting spraying in the step S3 and the operation of retreating in the step S4 until the last non-expanding and assisting spraying section exceeds the ground surface and stops retreating;
s6: the jet grouting drill bit extends to the middle of the first non-expanded jet grouting section again, the rotation is stopped, the expanded jet grouting assisting device is externally supported, and if the hydraulic pressure required by the external support of the expansion cylinder of the expanded jet grouting assisting device is less than 1/5 primary expansion hydraulic pressure value, the jet grouting drill bit rotates and returns to the middle of the next non-expanded jet grouting section to continue to detect the diameter of the pile body; if the expansion hydraulic pressure value exceeds 1/5 initial expansion hydraulic pressure value (the initial expansion hydraulic pressure value is the pressure value required when the expanding jet-assisted device expands to the specified pile diameter), after the section expands the diameter, the section re-jets according to the construction requirement;
s7: after the diameter of each section of the pile body reaches the design requirement, the construction of the jet grouting pile is finished, and the jet grouting pile is moved to the next pile position.
In the expanding rotary jet construction, the interval of 2-3 times of the pile diameter is used as a necessary position for expanding rotary jet, and whether the diameter of the rotary jet pile in the interval range meets the design requirement is used as a measuring standard for whether the non-expanding jet-assisted pile body of the section meets the design value.
The interval of 2-3 times of pile diameter is adopted because the influence range of drilling is a spherical body range of 2-3 times of the diameter of the pile according to the mechanics statistics;
the high-pressure slurry spraying synchronous linear cutting is carried out while the rod wall of the slurry conveying rod is fully utilized to cut and destroy a reinforced stratum in a mechanical extrusion mode, a sheet-shaped vertical cutting surface is formed after diameter expansion, the cutting surface can impact the high-pressure slurry on the stratum and stir and reinforce the stratum, the cutting, stirring and reinforcing are changed into cutting, stirring and reinforcing, the energy loss of the rotary spraying slurry is greatly reduced, and a guarantee is provided for the rotary spraying radius.
Because a concrete measuring tool cannot be used for measuring the diameter of the pile hole, the invention judges the expansion size of the expanding rotary spraying device according to the reading of the flow meter of the hydraulic cylinder, can judge the extension stroke of the hydraulic cylinder through the flow of a hydraulic system, further judge the extension length of the upper support arm and the lower support arm and finally judge the diameter of the pile hole.
The invention adopts the flow meter and the pressure gauge to judge the concrete pile diameter at a certain position and whether the position has an obstacle or not, further mechanical cutting can be carried out by probing out the upper support arm and the lower support arm, and real-time detection and real-time processing are ensured by combining the impact of high-pressure guniting.
Claims (4)
1. A jet grouting pile expanding and jet grouting assisting construction and pile diameter detection method is characterized by comprising the following operation steps:
s1: drilling by a rotary jet drill bit to a designed depth;
s2: the compression pump supplies slurry to the rotary nozzle after reaching a design pressure value;
s3: expanding the expanding jet grouting device to the designed diameter of the jet grouting pile, and keeping the jet grouting ports to perform linear jet grouting according to the designed value of the grouting pressure all the time in the expanding and contracting stages of the expanding jet grouting assisting device, so as to cut the reinforced stratum;
s4: after the expanding jet-assisted device shrinks and the jet-assisted drill bit returns to the designed pile depth, jet-assisted back to the position 2-3 times of the pile diameter according to the construction requirement;
s5: repeating the operations of expanding and assisting spraying in the step S3 and the operation of retreating in the step S4 until the last non-expanding and assisting spraying section exceeds the ground surface and stops retreating;
s6: the jet grouting drill bit extends to the middle of the first non-expanded jet grouting section again, the rotation is stopped, the expanded jet grouting assisting device is externally supported, and if the hydraulic pressure required by the external support of the expansion cylinder of the expanded jet grouting assisting device is less than 1/5 primary expansion hydraulic pressure value, the jet grouting drill bit rotates and returns to the middle of the next non-expanded jet grouting section to continue to detect the diameter of the pile body; if the expansion hydraulic pressure value exceeds 1/5 initial expansion hydraulic pressure value, after the section is expanded, the section is re-sprayed according to the construction requirement;
s7: after the diameter of each section of the pile body reaches the design requirement, the construction of the jet grouting pile is finished, and the jet grouting pile is moved to the next pile position.
2. The method for one-jet grouting pile expanding and jet grouting assisting construction and pile diameter detection according to claim 1, characterized by comprising the following steps: in the expanding rotary jet grouting construction, the interval of 3 times of the pile diameter is used as a necessary position for expanding rotary jet grouting, and whether the diameter of the rotary jet grouting pile in the interval range meets the design requirement is used as a measurement standard for judging whether the non-expanding jet grouting-assisted pile body of the section meets the design value.
3. The method for one-jet grouting pile expanding and jet grouting assisting construction and pile diameter detection according to claim 1, characterized by comprising the following steps: the high-pressure slurry spraying synchronous linear cutting is carried out while the rod wall of the slurry conveying rod is fully utilized to cut and destroy a reinforced stratum in a mechanical extrusion mode, a sheet-shaped vertical cutting surface is formed after diameter expansion, the cutting surface can impact the high-pressure slurry on the stratum and stir and reinforce the stratum, the cutting, stirring and reinforcing are changed into cutting, stirring and reinforcing, the energy loss of the rotary spraying slurry is greatly reduced, and a guarantee is provided for the rotary spraying radius.
4. The method for one-jet grouting pile expanding and jet grouting assisting construction and pile diameter detection according to claim 1, characterized by comprising the following steps: and judging the expansion size of the expanding rotary spraying device according to the reading of the flow meter of the hydraulic cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111482276.4A CN114151012A (en) | 2021-12-07 | 2021-12-07 | Jet grouting pile expanding and jet grouting assisting construction and pile diameter detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111482276.4A CN114151012A (en) | 2021-12-07 | 2021-12-07 | Jet grouting pile expanding and jet grouting assisting construction and pile diameter detection method |
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| CN114151012A true CN114151012A (en) | 2022-03-08 |
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| CN202111482276.4A Pending CN114151012A (en) | 2021-12-07 | 2021-12-07 | Jet grouting pile expanding and jet grouting assisting construction and pile diameter detection method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115419055A (en) * | 2022-10-08 | 2022-12-02 | 无锡市安曼工程机械有限公司 | Along with spouting calibrating device and spout rig soon |
| CN116927668A (en) * | 2023-09-18 | 2023-10-24 | 山东千颐科技有限公司 | Mining soft rock drilling anti-collapse drill bit drill rod mechanism |
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