CN115045266A - Slurry-jet pile construction method for foundation stabilization - Google Patents
Slurry-jet pile construction method for foundation stabilization Download PDFInfo
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- CN115045266A CN115045266A CN202210723827.XA CN202210723827A CN115045266A CN 115045266 A CN115045266 A CN 115045266A CN 202210723827 A CN202210723827 A CN 202210723827A CN 115045266 A CN115045266 A CN 115045266A
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- 238000010276 construction Methods 0.000 title claims abstract description 60
- 230000006641 stabilisation Effects 0.000 title claims description 7
- 238000011105 stabilization Methods 0.000 title claims description 7
- 238000003756 stirring Methods 0.000 claims abstract description 70
- 239000004568 cement Substances 0.000 claims abstract description 57
- 238000005507 spraying Methods 0.000 claims abstract description 43
- 238000005553 drilling Methods 0.000 claims abstract description 36
- 239000002002 slurry Substances 0.000 claims abstract description 34
- 239000002689 soil Substances 0.000 claims abstract description 15
- 230000002787 reinforcement Effects 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 230000005484 gravity Effects 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 35
- 230000008569 process Effects 0.000 claims description 17
- 239000011378 shotcrete Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000003973 paint Substances 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000003860 storage Methods 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 3
- 239000004570 mortar (masonry) Substances 0.000 claims description 3
- 238000007639 printing Methods 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 238000011049 filling Methods 0.000 claims description 2
- 230000003370 grooming effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 7
- 239000011440 grout Substances 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 239000002131 composite material Substances 0.000 abstract description 2
- 239000002245 particle Substances 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000010415 tidying Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/003—Methods for mixing
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention relates to a construction method of a grout spraying pile for foundation reinforcement, which comprises the steps of preparing and transporting grout, and controlling the specific gravity of the grout; pre-stirring and sinking, wherein after the stirrer and related equipment normally operate, the stirrer rotates to cut soil and sink, and when a drill bit sinks to a designed depth position, drilling is stopped; the cement slurry is pressed into the foundation after the first time of lifting, spraying and stirring, and the stirring shaft drills downwards to the designed depth, and the spraying amount is automatically recorded through a computer; and (4) repeating the guniting and stirring, when the drill bit is lifted away from the original plane, guniting and stirring simultaneously, stopping drilling and continuously guniting for 1-2min after the bottom of the guniting pile, and reversely rotating the stirring head from the bottom of the guniting pile to lift the stirring head to the ground. The guniting pile body obtained by the invention has high strength, good uniformity of the pile body, remarkably improved bearing capacity of the collapsible loess composite foundation, obviously reduced and improved collapsible property, ensured stability of bridges and culverts, no settlement, effectively improved piling effect and quality, maximized cement mixing amount effect, uniform and reasonable piling stress and high economic benefit.
Description
Technical Field
The invention relates to the technical field of foundation stabilization, in particular to a construction method of a slurry-jet pile for foundation stabilization.
Background
The collapsible loess subgrade of the yellow river alluvial plain has the property that the structure is rapidly destroyed and suddenly sinks after being soaked by water under the self weight or external load. The reason for causing the collapsible is because the loess mainly comprises particles and weak hydrophilic minerals, has a macroporous structure and small natural water content, has strong binding water binding of clay particles and cementing binding of salt, can bear a certain load during drying and does not deform a lot, but after soaking, the soil particle binding is obviously weakened, and the soil structure is damaged to generate collapsible deformation. Can bring different degrees of harm to the structure, greatly subside, crack and incline the structure, and even seriously affect the safety and the use of the structure.
At present, when soft foundations such as collapsible loess, silty soil, soft cohesive soil and loose sandy soil without flowing underground water are treated, and structures such as bridges and culverts are built under the geological conditions, the cement-cement ratio, pile forming time, pumping pressure, drilling speed and lifting speed of a cement mixing pile, cement mixing amount per linear meter and other parameters are difficult to control in the pile-spraying construction process adopting the traditional process, so that the defects of poor pile uniformity, unsatisfactory integrity or strength, slurry spreading on the surface, high cement content on the upper part of a pile body, unreasonable stress, low economic benefit and the like are caused.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for constructing a grout-injected pile for foundation reinforcement.
The invention provides a construction method of a slurry-jet pile for foundation stabilization, which adopts the following technical scheme:
a method for constructing a guniting pile for foundation reinforcement comprises the following steps:
construction preparation, namely preparing a construction drawing, cleaning a construction site to achieve tee joint leveling, and checking whether pipelines exist above and underground construction sections;
construction lofting;
positioning a drilling machine, moving the drilling machine to a specified position, centering and leveling, aligning the end of a drill rod to the center of a pile position, correcting the verticality of a drill frame by using a vertical ball, and marking the pile length position of a guniting pile on the drill rod by using red paint before drilling;
preparing and transporting the slurry, controlling the specific gravity of the cement slurry, and pouring the qualified cement slurry into a slurry pool;
pre-stirring and sinking, starting a stirring motor after a stirrer and related equipment normally operate, rotating the stirrer to cut soil and sink, observing the operation of the equipment and the change condition of the stratum, and stopping drilling when a drill bit sinks to a designed depth position;
lifting the slurry spraying and stirring for the first time, starting a mortar pump to press the cement slurry into the foundation after the stirring shaft drills down to the designed depth, and automatically recording the slurry spraying amount through a computer;
repeatedly spraying and stirring, when the drill bit is lifted away from the original plane, spraying and stirring to the bottom of the spraying pile, stopping drilling and continuously spraying for 1-2min after the spraying pile is at the bottom, and reversely rotating the stirring head from the bottom of the spraying pile to lift to the ground;
the machine tool shifts, the power supply is turned off, and the drilling machine shifts.
By adopting the technical scheme, the water cement ratio, the guniting pressure, the cement paste stirring time, the speed, the drilling lifting time, the stirring shaft rotating speed and the like in the construction process are set, so that the construction efficiency can be effectively improved, the engineering construction quality is further improved, after the construction method disclosed by the invention is adopted, the pile body strength of the guniting pile is high and can reach 3.8Mpa, the pile body uniformity is good, the bearing capacity of the collapsible loess composite foundation is remarkably improved to 160KN/140KN/120KN, the pile forming strength is normalized, the improved collapsibility is obviously reduced, the stability of a bridge culvert is ensured, settlement is not generated, the pile forming effect and quality are effectively improved, the designed cement mixing amount effect is maximized, the pile forming stress is uniform and reasonable, and the economic benefit is high.
Preferably, the designed pile top elevation of the slurry spraying pile is 50cm below the ground after being leveled in a construction site.
Preferably, the construction lofting adopts a coordinate lofting method.
Preferably, the method for correcting the perpendicularity of the drill rig by using the plumb sphere comprises the following steps: and hanging 1 vertical ball at the edge of the stirring shaft, moving the drilling machine to the right position by using a steel wire rope and a jack, and then adjusting the stirring shaft to be vertical by using the vertical ball.
Preferably, when the cement paste is prepared, the mixing amount of cement per linear meter is 48kg, the water cement ratio is 0.5, and the spraying pressure is 0.4-0.6 Mpa; the stirring time of the cement paste is 6 minutes, the stirring speed is 30 r/min-50 r/min, the storage time of the cement paste is less than 2 hours, the pile forming effect and quality are effectively improved, and the maximum designed cement mixing amount effect is ensured.
Preferably, when the pre-stirring sinks, the slurry spraying port reaches the ground line and starts counting by a computer, the speed of the stirring shaft in the sinking process is controlled by the current of an ammeter, the sinking speed is 0.4-0.7 m/min, and the working current is 60-70A.
Preferably, the first lifting guniting stirring adopts a lifting guniting method, in the lifting guniting process, the rotating speed of the stirring shaft is 50-60 r/min, and the lifting speed of the stirring shaft is 0.4-0.7 m/min.
Preferably, the method further comprises the following steps after the repeated guniting and stirring steps: and printing construction process data and piling data before the displacement of the drilling machine.
Preferably, after the tool shifting step, the method further comprises the following steps of on-site tidying: and cleaning residual cement slurry in all pipelines, cleaning soft soil adhered to the stirring head, and filling construction records.
In summary, the invention has the following beneficial technical effects:
by setting the water-cement ratio, the guniting pressure, the cement paste stirring time, the speed, the drilling-down lifting time, the stirring shaft rotating speed and the like in the construction process, the construction efficiency can be effectively improved, and further the engineering construction quality is improved.
Drawings
Fig. 1 is a flowchart illustrating a method for constructing a shotcrete pile for foundation reinforcement according to an embodiment of the present disclosure.
Detailed Description
The present invention is described in further detail below with reference to fig. 1.
The embodiment of the invention discloses a construction method of a slurry-jet pile for foundation stabilization. Referring to fig. 1, the method includes the following steps:
100, preparation for construction.
Wherein, step 100 specifically comprises:
101, preparing a construction drawing.
It should be noted that the pile top elevation of the slurry spraying pile is designed to be 50cm below the ground after being leveled in a construction site.
102, cleaning a construction site, removing impurities to reach the level of a tee joint, and meeting the conditions of water circulation, electricity circulation, road communication, field leveling and the like on the construction site;
103, checking whether pipelines exist above and under the construction section.
It should be noted that step 101, step 102, and step 103 are not in order and may be executed in parallel.
And 200, construction lofting.
Specifically, in step 200, lofting is performed by a coordinate method, measurement and setting-out are performed by a GPS according to a construction plan and pile position coordinates, pile-by-pile placement positions are measured according to the coordinates, and the pile placement positions are marked by wood piles and lime. After pile position lofting is finished, using GPS to spot check and recheck the pile positions, requiring each row (or row) to spot check more than 3 points, expanding the range of rechecking the pile when finding that the deviation of one pile position does not meet the requirement, and correcting the deviation. Pile position lofting allowable deviation is not more than 5 cm. The pile position is frequently rechecked in the construction process. For the pile positions damaged in the construction, when the quantity is small, the pile positions are reset by a mechanical length stay wire and a steel tape, and the quantity (adjacent piles) is large, and the pile positions are reset by a measurer by using an instrument.
And 300, positioning the drilling machine, moving the drilling machine to a specified position, centering and leveling, aligning the end of the drilling rod to the center of the pile position, correcting the verticality of the drilling frame by using a vertical ball, and marking the pile length position on the drilling rod by using red paint before drilling.
Wherein, step 300 specifically includes:
301, installing and debugging the drilling machine, checking that various indexes such as rotating speed, air compression equipment, length of a drill rod, diameter of a drill bit, distance of the drill bit and the like meet requirements, and connecting a slurry conveying pipeline.
Specifically, the slurry conveying pipeline is 60 m.
302, moving the drilling machine to a designated position, centering and leveling, aligning the end of the drill rod with the center of the pile position, and correcting the verticality of the drilling frame by using a vertical ball.
Specifically, the method for correcting the perpendicularity of the drill rig by using the plumb line ball comprises the following steps:
1 vertical line ball is hung on the edge of the stirring shaft, the weight of the vertical line ball is 0.5kg, the length of a hanging line is 3m, the drilling machine is moved to the right position by using a steel wire rope and a jack, and then the stirring shaft is adjusted to be vertical by using the vertical line ball.
Wherein, the verticality deviation is less than 1 percent, and the pile position deviation is 2 cm.
303, marking the pile length position of the guniting pile on the drill rod by using red paint before drilling.
400, preparation and transportation of the slurry.
And controlling the specific gravity of the cement paste, and pouring the qualified cement paste into a paste pool.
Specifically, when cement paste is prepared, the mixing amount of cement per linear meter is 48kg, the water cement ratio is 0.5, and the spraying pressure is 0.4-0.6 Mpa; the stirring time of the cement paste is 6 minutes, the stirring speed is 30 r/min-50 r/min, the prepared cement paste cannot be separated and precipitated, the storage time of the cement paste is less than 2 hours, the storage time is more than two hours, the cement paste is discarded, and the prepared cement paste is filtered by a sieve when being poured into a paste pool so as to avoid the agglomeration in paste.
500, pre-stirring and sinking.
Specifically, after the stirrer and related equipment normally operate, the stirring motor is started, and the stirrer rotates to cut soil and sink.
Specifically, when the drilling is carried out, a computer starts counting when a guniting port reaches the ground line, the speed of the mixer shaft in the sinking process is controlled by the current of an ammeter, the sinking speed is 0.4-0.7 m/min, the working current is 60-70A, the equipment operation and stratum change conditions are observed at any time, when a drill bit is sunk to the designed depth position, the designed pile top elevation of the guniting pile is 50cm below the ground after construction site leveling, and the drilling is stopped.
600, lifting the guniting and stirring for the first time.
Specifically, the first lifting guniting stirring adopts a lifting guniting method;
the method for lifting the guniting specifically comprises the following steps: after the stirring shaft drills downwards to the designed depth, the mortar pump is started to press cement paste into a foundation, the cement paste is sprayed and rotated at the same time, in the process of lifting the cement paste, the rotating speed of the stirring shaft is 50-60 r/min, the lifting speed of the stirring shaft is 0.4-0.7 m/min, and the cement paste is sprayed and lifted at the same time until the designed length of the cement paste spraying pile is reached;
specifically, in the process of guniting, cement paste is continuously stirred to prevent the cement paste from being isolated, the guniting amount is automatically recorded through a computer, and the guniting is stopped when the cement paste is 50cm away from the ground.
700, repeating the slurry spraying and stirring.
Specifically, when the drill bit is lifted to be 50cm away from the original ground, the slurry is sprayed and stirred to the bottom of the slurry spraying pile, the drilling is stopped after the bottom of the slurry spraying pile is reached, the slurry is continuously sprayed for 1-2min, and the stirring head is reversely rotated from the bottom of the slurry spraying pile and lifted to the ground;
wherein the stirring head rotates reversely from the bottom of the guniting pile while spraying, the rotating speed of the stirring shaft is 50-60 r/min, the lifting speed of the stirring shaft is 0.4-0.7 m/min, the stirring shaft is lifted to the ground, and construction records are made.
In the process of re-stirring, the part of the guniting pile body with insufficient local guniting is supplemented with guniting, and the blockage of a guniting opening is prevented.
800, printing construction process data and piling data.
Specifically, after pile forming, the construction process data and pile forming data are printed before the drilling machine moves, the data are added after the machine is strictly forbidden to move, the pile forming data are printed with side station supervision and supervision, and the side station supervision and signing are carried out after the pile forming data are printed.
900, implement shift.
Specifically, the power is turned off, the drilling machine moves, 4% cement compaction treatment is carried out on soil 40cm from the ground surface, the cement spraying piles are densely arranged for construction, repeated construction is carried out one by one and row by row according to preset point positions, the soil adhered to the stirring head is cleaned after the stirring shaft is lifted out of the ground after the cement spraying is finished, then the cement spraying pile moves, when the reinforced soil quality is poor, and when the design requirement cannot be met by one-time cement spraying of the stirring machine, the cement spraying amount can be complemented when the repeated stirring is carried out by adopting two-time cement spraying, and then the construction of the next cement spraying pile is carried out.
1000, field finishing.
Specifically, after the construction paragraph, the residual cement slurry in all the pipelines is cleaned, the soft soil adhered to the stirring head is cleaned, and the construction record is filled.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and furthermore, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The above are all preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (9)
1. A construction method of a slurry spraying pile for foundation reinforcement is characterized in that: the method comprises the following steps:
construction preparation, namely preparing a construction drawing, cleaning a construction site to achieve tee joint leveling, and checking whether pipelines exist above and underground construction sections;
construction lofting;
positioning a drilling machine, moving the drilling machine to a specified position, centering and leveling, aligning the end of a drill rod to the center of a pile position, correcting the verticality of a drill frame by using a vertical ball, and marking the pile length position of a guniting pile on the drill rod by using red paint before drilling;
preparing and transporting the slurry, controlling the specific gravity of the cement slurry, and pouring the qualified cement slurry into a slurry pool;
pre-stirring and sinking, starting a stirring motor after a stirrer and related equipment normally operate, rotating the stirrer to cut soil and sink, observing the operation of the equipment and the change condition of the stratum, and stopping drilling when a drill bit sinks to a designed depth position;
lifting the slurry spraying and stirring for the first time, starting a mortar pump to press the cement slurry into the foundation after the stirring shaft drills down to the designed depth, and automatically recording the slurry spraying amount through a computer;
repeatedly spraying and stirring, when the drill bit is lifted away from the original plane, spraying and stirring to the bottom of the spraying pile, stopping drilling and continuously spraying for 1-2min after the spraying pile is at the bottom, and reversely rotating the stirring head from the bottom of the spraying pile to lift to the ground;
the machine tool shifts, the power supply is turned off, and the drilling machine shifts.
2. The shotcrete construction method for foundation reinforcement according to claim 1, wherein: the designed pile top elevation of the slurry spraying pile is 50cm below the ground after being leveled in a construction site.
3. The shotcrete construction method for foundation reinforcement according to claim 1, wherein: and the construction lofting adopts a coordinate lofting method.
4. The shotcrete construction method for foundation reinforcement according to claim 1, wherein: the method for correcting the perpendicularity of the drill frame by using the plumb line ball comprises the following steps:
and hanging 1 vertical ball at the edge of the stirring shaft rod, moving the drilling machine to the right position by using a steel wire rope and a jack, and then adjusting the stirring shaft to be vertical by using the vertical ball.
5. The shotcrete construction method for foundation reinforcement according to claim 1, wherein: when the cement paste is prepared, the mixing amount of cement per linear meter is 48kg, the water cement ratio is 0.5, and the spraying pressure is 0.4-0.6 Mpa; the stirring time of the cement paste is 6 minutes, the stirring speed is 30 r/min-50 r/min, and the storage time of the cement paste is less than 2 hours.
6. The shotcrete construction method for foundation stabilization according to claim 1, wherein: when the pre-stirring sinks, the slurry spraying port reaches the ground line and the computer starts counting, the speed of the stirring shaft in the sinking process is controlled by the current of the ammeter, the sinking speed is 0.4 m/min-0.7 m/min, and the working current is 60A-70A.
7. The shotcrete construction method for foundation reinforcement according to claim 1, wherein: the first lifting guniting stirring adopts a lifting guniting method, in the lifting guniting process, the rotating speed of the stirring shaft is 50-60 r/min, and the lifting speed of the stirring shaft is 0.4-0.7 m/min.
8. The shotcrete construction method for foundation reinforcement according to claim 1, wherein: after the step of repeatedly spraying and stirring, the method also comprises the following steps:
and printing construction process data and piling data before the displacement of the drilling machine.
9. The shotcrete construction method for foundation reinforcement according to claim 1, wherein: further comprising field grooming after the implement shifting step:
and cleaning residual cement slurry in all pipelines, cleaning soft soil adhered to the stirring head, and filling construction records.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210723827.XA CN115045266A (en) | 2022-06-24 | 2022-06-24 | Slurry-jet pile construction method for foundation stabilization |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210723827.XA CN115045266A (en) | 2022-06-24 | 2022-06-24 | Slurry-jet pile construction method for foundation stabilization |
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| CN115045266A true CN115045266A (en) | 2022-09-13 |
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