CN113356189A - Full-sleeve hole forming construction method for rotary drilling rig - Google Patents
Full-sleeve hole forming construction method for rotary drilling rig Download PDFInfo
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- CN113356189A CN113356189A CN202110686817.9A CN202110686817A CN113356189A CN 113356189 A CN113356189 A CN 113356189A CN 202110686817 A CN202110686817 A CN 202110686817A CN 113356189 A CN113356189 A CN 113356189A
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- pile
- rotary drilling
- drilling rig
- construction
- sleeve
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- 238000005553 drilling Methods 0.000 title claims abstract description 76
- 238000010276 construction Methods 0.000 title claims abstract description 67
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 56
- 239000010959 steel Substances 0.000 claims abstract description 56
- 238000000034 method Methods 0.000 claims abstract description 25
- 230000002787 reinforcement Effects 0.000 claims abstract description 12
- 239000002689 soil Substances 0.000 claims abstract description 9
- 238000012360 testing method Methods 0.000 claims abstract description 8
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000009412 basement excavation Methods 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 4
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 230000005012 migration Effects 0.000 claims description 3
- 238000013508 migration Methods 0.000 claims description 3
- 239000002356 single layer Substances 0.000 claims description 3
- 238000005527 soil sampling Methods 0.000 claims description 3
- 238000004080 punching Methods 0.000 description 3
- 238000009415 formwork Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
-
- 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
- E21B27/00—Containers for collecting or depositing substances in boreholes or wells, e.g. bailers, baskets or buckets for collecting mud or sand; Drill bits with means for collecting substances, e.g. valve drill bits
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B3/00—Rotary drilling
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Civil Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to the technical field of full-casing cast-in-place pile construction, in particular to a full-casing hole forming construction method of a rotary drilling rig. The method comprises the following steps: s1, construction preparation: s11, leveling and hardening the field; s12, testing the pile before the full-sleeve rotary-digging pile is formed; s2, construction of guide walls: s21, leveling the field; s22, pile position measuring and placing; s23, excavating a guide wall groove; s24, binding steel bars; s25, constructing a template; s26, performing concrete pouring construction; s3, constructing the full-casing rotary excavating pile: s31, positioning the rotary drilling rig; s32, installing a steel sleeve driving sleeve device of the rotary drilling rig and connecting a steel sleeve; s33, taking soil and forming holes; s34, hoisting the reinforcement cage; s35, pouring concrete; and S36, forming a pile by drawing a pipe. The invention obviously improves the construction efficiency while ensuring the construction quality, has no mud pollution in the construction process and is green and environment-friendly. The method is mainly applied to the aspect of full casing pipe hole forming construction of the rotary drilling rig.
Description
Technical Field
The invention relates to the technical field of full-casing cast-in-place pile construction, in particular to a full-casing hole forming construction method of a rotary drilling rig.
Background
In recent years, a rotary drilling rig is used as a relatively advanced construction machine in cast-in-situ bored pile construction, and has the advantages of wide pile diameter application range, adaptability to various geological conditions, accurate pile position positioning, good hole forming quality, high automation degree, flexibility and convenience in movement and the like, so that the rotary drilling rig is particularly environment-friendly and high in working efficiency, and shows obvious superiority in the construction of urban high-rise building foundations and expressway bridge pile foundations.
The mud retaining wall process is generally adopted for hole forming of the rotary drilling rig, when the geological conditions are poor, the mud retaining wall process of the rotary drilling rig hardly ensures the pile forming quality, and the stress release of surrounding strata is easily caused, so that deformation and settlement of surrounding buildings and the ground are easily caused; the slurry protection wall pile of the rotary drilling rig has poor appearance quality. Therefore, the existing enclosure structure of the deep foundation pit of the front-line city generally does not adopt a mud dado construction process of a rotary drilling rig, but adopts a hydraulic steel sleeve full-length dado and a mechanical punching and grabbing hole forming process, but the construction efficiency of the hydraulic steel sleeve full-length dado and mechanical punching and grabbing hole forming process is too slow, the difference from the hole forming construction efficiency of the rotary drilling rig is larger, and the hydraulic steel sleeve full-length dado and mechanical punching and grabbing hole forming process needs a plurality of machines to cooperate with each other to operate and occupy a larger field.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a rotary drilling rig full casing pipe hole forming construction method which has strong site adaptability and high construction speed, reduces the construction cost, improves the construction quality, has small environmental pollution and is easy to popularize and use for reference.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a rotary drilling rig full casing pipe hole forming construction method comprises the following steps:
s1, construction preparation: s11, leveling and hardening the field; s12, testing the pile before the full-sleeve rotary-digging pile is formed;
s2, construction of guide walls:
s21, leveling the field: removing impurities on the surface of the ground, and filling and rolling the groove for the migration of the ground pipeline;
s22, pile position measuring and placing;
s23, excavating a guide wall groove: after the pile position lofting line meets the requirements, the groove can be excavated, and the groove is excavated by adopting mechanical cooperation and manual operation;
s24, binding steel bars;
s25, template construction: the template adopts a self-made integral steel mold, and the diameter of the template of the positioning hole of the guide wall reserved occlusive pile is 4cm larger than the diameter of the pile;
s26, concrete pouring construction: when concrete is poured, the two sides are symmetrically and alternately carried out, and the mold is strictly prevented from moving;
s3, constructing the full-casing rotary excavating pile:
s31, positioning the rotary drilling rig;
s32, installing a steel sleeve driving sleeve device of the rotary drilling rig and connecting a steel sleeve;
s33, taking soil and forming holes: after the pile driver is in place, aligning the center of the steel sleeve to the center of the pile position, aligning the verticality of the mast, rotating the driving sleeve to press the steel sleeve downwards, then detaching the driving sleeve and the steel sleeve, and taking soil from the sleeve by using a rotary drilling bit;
s34, hoisting the reinforcement cage: the top elevation of the reinforcement cage is controlled to be correct when the reinforcement cage is installed;
s35, pouring concrete;
s36, forming a pile by drawing a pipe: and (3) pouring concrete and drawing the pipe, and keeping the bottom of the sleeve not less than 2.5m lower than the concrete surface all the time.
In the step S22, the coordinates of the center line of the row pile are calculated according to the coordinates provided by the design drawing and the external placement of 100mm, the total station is adopted to perform on-site lofting according to the plane control point, and the fender pile is made to serve as the control center line of the guide wall construction.
In the step S24, after the trench is excavated, wall-guiding reinforcing steel bars are bound, the wall-guiding reinforcing steel bars are formed by phi 12 deformed steel bars, the wall-guiding reinforcing steel bars are arranged in a single-layer bidirectional manner, the reinforcing steel bars are arranged at intervals of 200 × 200, and the horizontal reinforcing steel bars are arranged on the inner side.
In the step S31, after the strength of the guide wall reaches the standard, the template is removed, the center position of the rotary drilling pile is repositioned, the point position is detected on the top surface of the guide wall and is used as a positioning control point of the rotary drilling rig, the rotary drilling rig is moved to the correct position, and the center of the drill bit of the rotary drilling rig is aligned with the center position of the rotary drilling pile.
In the step S32, the maximum height of the driving head of the rotary drilling rig from the ground is 5m, the length of the standard section of the steel sleeve is designed to be 4m, and the length of the first section of the steel sleeve of the pipe section with the tool bit is designed to be 5 m. Drilling a hole by a rotary drilling rig at a proper position near a pile position, wherein the drilling depth is 3-4 m, then hoisting a first section of steel sleeve into an auxiliary hole by using an auxiliary hook of the rotary drilling rig, detaching a barrel drill bit and a collision bearing body from the rotary drilling rig, installing a driving sleeve device, then reinstalling an upper barrel drill bit, horizontally moving a drill rod, inserting a driving sleeve into the first section of steel sleeve, and locking the driving sleeve and the steel sleeve together by rotating the driving sleeve.
In the step S33, the depth of the bottom opening of the casing pipe ahead of the excavation surface is always kept to be not less than 0.5m, after soil sampling is completed, the next section of steel casing pipe is connected with the driving sleeve in the auxiliary hole, and finally two sections of steel casing pipes are connected by adopting the same method.
In the step S35, if there is water in the hole, an underwater concrete pouring method is used for construction, and if there is no water in the hole, a dry hole pouring method is used for construction, and concrete vibration should be reinforced.
Compared with the prior art, the invention has the beneficial effects that:
the chassis of the rotary drilling rig is crawler-type, so that the rotary drilling rig is convenient to walk. The front end of the rotary drilling rig is provided with a drill bit, so that the rotary drilling rig is small in size, free of other auxiliary facilities and strong in adaptability to narrow places; the steel sleeve pressing speed and the pile core soil taking speed are increased, so that the hole forming speed is greatly increased; the service time of the construction machine is reduced; the method can effectively solve the problems of hole collapse, necking, high filling coefficient and the like when the ordinary construction method is adopted for cast-in-place pile construction in urban high fill, karst landform, quicksand and the like, and the construction method has wide corresponding range. The invention obviously improves the construction efficiency while ensuring the construction quality, has no mud pollution in the construction process and is green and environment-friendly.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A rotary drilling rig full casing pipe hole forming construction method comprises the following steps:
s1, construction preparation: s11, leveling and hardening the site, hardening the temporary construction road by adopting concrete, filling the ground of the rest site by stone powder or broken bricks and concrete slag, wherein the thickness is not less than 300mm, and rolling firmly and flatly to ensure the safe walking of the construction machinery; adopting mechanical cooperation to manually dig grooves and flatten the guide plate of the secant pile, wherein the elevation error is less than +/-20 mm, and the flatness is less than 10 mm;
s12, testing the pile before the full-sleeve rotary-digging pile is formed; the purpose of pile testing is to verify the design geology and obtain detailed geological parameters; providing a basis for finally determining the pile length; the adaptability of the rotary drilling rig in drilling construction and the construction efficiency of the rotary drilling rig in each stratum are researched; determining a hole cleaning method suitable for the full-casing rotary drilling hole; researching the optimal method for the reliability and the setting of the measure of the protective layer of the reinforcement cage; determining a reasonable mechanical and personnel configuration scheme through a test; verifying the rationality of the concrete pouring mode and the process of the rotary excavating pile; the construction process of the full-casing rotary excavating pile and the reasonable design of a drilling machine can be verified through pile testing, and the concrete supply capacity of a mixing station can be verified, so that improvement can be realized in construction. The lifting speed, the rotating speed, the drill bit diameter and the like of the drill rod of the rotary drilling rig can be verified through pile testing.
S2, construction of guide walls:
s21, leveling the field: removing impurities on the surface of the ground, and filling and rolling the groove for the migration of the ground pipeline;
s22, pile position measuring and placing;
s23, excavating a guide wall groove: after the pile position lofting line meets the requirements, the groove can be excavated, and the groove is excavated by adopting mechanical cooperation and manual operation; after the excavation is finished, the central line is immediately led into the bottom of the groove to control the template construction and ensure the correctness of the central line of the guide wall.
S24, binding steel bars;
s25, template construction: the template adopts a self-made integral steel mold, and the diameter of the template of the positioning hole of the guide wall reserved occlusive pile is 4cm larger than the diameter of the pile; the template is reinforced and supported by steel pipes, the supporting distance is not more than 1 m, the reinforcement is firm, the template is strictly prevented from running, the accuracy of the axis and the clearance is ensured, and before concrete pouring, whether the perpendicularity and the center line of the template and the diameter of a pile hole meet the requirements is checked.
S26, concrete pouring construction: when concrete is poured, the two sides are symmetrically and alternately carried out, and the mold is strictly prevented from moving; and if the formwork walking occurs, stopping pouring of concrete immediately, reinforcing the formwork again, correcting to the designed position, and then continuing pouring of the concrete. The vibrating adopts an inserted vibrator, the vibrating distance is about 500mm, the non-uniform vibrating is prevented, and the phenomenon of mold walking caused by over-vibration at one position is also prevented.
S3, constructing the full-casing rotary excavating pile:
s31, positioning the rotary drilling rig;
s32, installing a steel sleeve driving sleeve device of the rotary drilling rig and connecting a steel sleeve;
s33, taking soil and forming holes: after the pile driver is in place, aligning the center of the steel sleeve to the center of the pile position, aligning the verticality of the mast, rotating the driving sleeve to press the steel sleeve downwards, then detaching the driving sleeve and the steel sleeve, and taking soil from the sleeve by using a rotary drilling bit;
s34, hoisting the reinforcement cage: the top elevation of the reinforcement cage is controlled to be correct when the reinforcement cage is installed;
s35, pouring concrete;
s36, forming a pile by drawing a pipe: and (3) pouring concrete and drawing the pipe, and keeping the bottom of the sleeve not less than 2.5m lower than the concrete surface all the time.
Preferably, in step S22, the coordinates of the center line of the row pile are calculated according to the coordinates provided by the design drawing and the external placement of 100mm, a total station is used for performing on-site lofting according to the plane control point, and a fender pile is made to serve as the control center line for the guide wall construction.
Preferably, in step S24, after the trench excavation is completed, the guide wall reinforcing steel bars are bound, the guide wall reinforcing steel bars are formed by phi 12 deformed steel bars, the guide wall reinforcing steel bars are arranged in a single-layer bidirectional manner, the reinforcing steel bar spacing is 200 × 200, and the horizontal reinforcing steel bars are arranged on the inner side.
Preferably, in step S31, after the strength of the guide wall reaches the standard, the template is removed, the center position of the rotary drilling pile is repositioned, the point position is detected on the top surface of the guide wall and is used as a positioning control point of the rotary drilling rig, the rotary drilling rig is moved to the correct position, and the center of the drill bit of the rotary drilling rig is aligned with the center position of the rotary drilling pile.
Preferably, in step S32, the maximum height of the driving head of the rotary drilling rig from the ground is 5m, the length of the standard section of the steel sleeve is 4m, and the length of the first section of the steel sleeve of the pipe section with the cutter head is 5 m. Drilling a hole by a rotary drilling rig at a proper position near a pile position, wherein the drilling depth is 3-4 m, then hoisting a first section of steel sleeve into an auxiliary hole by using an auxiliary hook of the rotary drilling rig, detaching a barrel drill bit and a collision bearing body from the rotary drilling rig, installing a driving sleeve device, then reinstalling an upper barrel drill bit, horizontally moving a drill rod, inserting a driving sleeve into the first section of steel sleeve, and locking the driving sleeve and the steel sleeve together by rotating the driving sleeve.
Preferably, in step S33, the depth of the bottom opening of the casing pipe ahead of the excavation surface is always kept to be not less than 0.5m, after the soil sampling is completed, the next steel casing pipe is connected with the driving sleeve in the auxiliary hole, and finally the two steel casing pipes are connected by the same method. And finally, connecting the two sections of steel sleeves by adopting the same method. And (4) pressing the steel sleeve, taking soil and connecting the steel sleeve in sequence until the designed hole bottom elevation is reached.
Preferably, in step S35, if there is water in the hole, the underwater concrete pouring method is used for construction, and if there is no water in the hole, the dry hole pouring method is used for construction, and the concrete should be reinforced and vibrated.
Although only the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art, and all changes are encompassed in the scope of the present invention.
Claims (7)
1. A rotary drilling rig full casing pipe hole forming construction method is characterized by comprising the following steps:
s1, construction preparation: s11, leveling and hardening the field; s12, testing the pile before the full-sleeve rotary-digging pile is formed;
s2, construction of guide walls:
s21, leveling the field: removing impurities on the surface of the ground, and filling and rolling the groove for the migration of the ground pipeline;
s22, pile position measuring and placing;
s23, excavating a guide wall groove: after the pile position lofting line meets the requirements, the groove can be excavated, and the groove is excavated by adopting mechanical cooperation and manual operation;
s24, binding steel bars;
s25, template construction: the template adopts a self-made integral steel mold, and the diameter of the template of the positioning hole of the guide wall reserved occlusive pile is 4cm larger than the diameter of the pile;
s26, concrete pouring construction: when concrete is poured, the two sides are symmetrically and alternately carried out, and the mold is strictly prevented from moving;
s3, constructing the full-casing rotary excavating pile:
s31, positioning the rotary drilling rig;
s32, installing a steel sleeve driving sleeve device of the rotary drilling rig and connecting a steel sleeve;
s33, taking soil and forming holes: after the pile driver is in place, aligning the center of the steel sleeve to the center of the pile position, aligning the verticality of the mast, rotating the driving sleeve to press the steel sleeve downwards, then detaching the driving sleeve and the steel sleeve, and taking soil from the sleeve by using a rotary drilling bit;
s34, hoisting the reinforcement cage: the top elevation of the reinforcement cage is controlled to be correct when the reinforcement cage is installed;
s35, pouring concrete;
s36, forming a pile by drawing a pipe: and (3) pouring concrete and drawing the pipe, and keeping the bottom of the sleeve not less than 2.5m lower than the concrete surface all the time.
2. The rotary drilling rig full casing pipe hole forming construction method according to claim 1, characterized in that: in the step S22, the coordinates of the center line of the row pile are calculated according to the coordinates provided by the design drawing and the external placement of 100mm, the total station is adopted to perform on-site lofting according to the plane control point, and the fender pile is made to serve as the control center line of the guide wall construction.
3. The rotary drilling rig full casing pipe hole forming construction method according to claim 1, characterized in that: in the step S24, after the trench is excavated, wall-guiding reinforcing steel bars are bound, the wall-guiding reinforcing steel bars are formed by phi 12 deformed steel bars, the wall-guiding reinforcing steel bars are arranged in a single-layer bidirectional manner, the reinforcing steel bars are arranged at intervals of 200 × 200, and the horizontal reinforcing steel bars are arranged on the inner side.
4. The rotary drilling rig full casing pipe hole forming construction method according to claim 1, characterized in that: in the step S31, after the strength of the guide wall reaches the standard, the template is removed, the center position of the rotary drilling pile is repositioned, the point position is detected on the top surface of the guide wall and is used as a positioning control point of the rotary drilling rig, the rotary drilling rig is moved to the correct position, and the center of the drill bit of the rotary drilling rig is aligned with the center position of the rotary drilling pile.
5. The rotary drilling rig full casing pipe hole forming construction method according to claim 1, characterized in that: in the step S32, the maximum height of the driving head of the rotary drilling rig from the ground is 5m, the length of the standard section of the steel sleeve is designed to be 4m, and the length of the first section of the steel sleeve of the pipe section with the tool bit is designed to be 5 m. Drilling a hole by a rotary drilling rig at a proper position near a pile position, wherein the drilling depth is 3-4 m, then hoisting a first section of steel sleeve into an auxiliary hole by using an auxiliary hook of the rotary drilling rig, detaching a barrel drill bit and a collision bearing body from the rotary drilling rig, installing a driving sleeve device, then reinstalling an upper barrel drill bit, horizontally moving a drill rod, inserting a driving sleeve into the first section of steel sleeve, and locking the driving sleeve and the steel sleeve together by rotating the driving sleeve.
6. The rotary drilling rig full casing pipe hole forming construction method according to claim 1, characterized in that: in the step S33, the depth of the bottom opening of the casing pipe ahead of the excavation surface is always kept to be not less than 0.5m, after soil sampling is completed, the next section of steel casing pipe is connected with the driving sleeve in the auxiliary hole, and finally two sections of steel casing pipes are connected by adopting the same method.
7. The rotary drilling rig full casing pipe hole forming construction method according to claim 1, characterized in that: in the step S35, if there is water in the hole, an underwater concrete pouring method is used for construction, and if there is no water in the hole, a dry hole pouring method is used for construction, and concrete vibration should be reinforced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110686817.9A CN113356189A (en) | 2021-06-21 | 2021-06-21 | Full-sleeve hole forming construction method for rotary drilling rig |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110686817.9A CN113356189A (en) | 2021-06-21 | 2021-06-21 | Full-sleeve hole forming construction method for rotary drilling rig |
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| Publication Number | Publication Date |
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| CN113356189A true CN113356189A (en) | 2021-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110686817.9A Pending CN113356189A (en) | 2021-06-21 | 2021-06-21 | Full-sleeve hole forming construction method for rotary drilling rig |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114508097A (en) * | 2022-03-22 | 2022-05-17 | 中铁十一局集团有限公司 | Rotary drilling construction method for railway line slope pile foundation |
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2021
- 2021-06-21 CN CN202110686817.9A patent/CN113356189A/en active Pending
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| CN103276723A (en) * | 2013-04-27 | 2013-09-04 | 瑞华建设集团有限公司 | Construction method of concrete bored secant pile |
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| CN108130904A (en) * | 2017-12-25 | 2018-06-08 | 浙江大学城市学院 | A kind of construction method of the composite bushing drill-pouring pilework of neighbouring existing subway |
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| CN114508097A (en) * | 2022-03-22 | 2022-05-17 | 中铁十一局集团有限公司 | Rotary drilling construction method for railway line slope pile foundation |
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