CN115198770A - Positioning pile casing device and static drilling rooted pile construction method using same - Google Patents
Positioning pile casing device and static drilling rooted pile construction method using same Download PDFInfo
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- CN115198770A CN115198770A CN202210875956.0A CN202210875956A CN115198770A CN 115198770 A CN115198770 A CN 115198770A CN 202210875956 A CN202210875956 A CN 202210875956A CN 115198770 A CN115198770 A CN 115198770A
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- 238000005553 drilling Methods 0.000 title claims abstract description 65
- 238000010276 construction Methods 0.000 title claims abstract description 54
- 230000003068 static effect Effects 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 29
- 239000002689 soil Substances 0.000 claims abstract description 18
- 239000004568 cement Substances 0.000 claims abstract description 15
- 230000001681 protective effect Effects 0.000 claims abstract description 6
- 230000000670 limiting effect Effects 0.000 claims description 21
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 4
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 4
- 241001330002 Bambuseae Species 0.000 claims description 4
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 4
- 239000011425 bamboo Substances 0.000 claims description 4
- 210000001503 joint Anatomy 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 6
- 239000002002 slurry Substances 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- 239000002699 waste material Substances 0.000 description 4
- 238000003825 pressing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/06—Foundation trenches ditches or narrow shafts
- E02D17/08—Bordering or stiffening the sides of ditches trenches or narrow shafts for foundations
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- 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
- E02D5/36—Concrete or concrete-like piles cast in position ; Apparatus for making same making without use of mouldpipes or other moulds
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- 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
- E02D5/50—Piles comprising both precast concrete portions and concrete portions cast in situ
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/003—Injection of material
Abstract
The invention relates to a positioning pile casing device and a static drilling rooted pile construction method using the same, wherein the positioning pile casing device comprises a pile casing and a positioning cover, the positioning cover is positioned above the pile casing, a circle of placing block is arranged on the circumferential side wall of the positioning cover, a clamping groove matched with the opening wall of the pile casing is arranged on the placing block, and the positioning cover is clamped on the opening wall of the pile casing through the clamping groove; the center of the cover surface of the positioning cover is provided with a positioning opening through which a precast pile can be inserted; according to the invention, by arranging the protective cylinder and the positioning cover, the embedded hole with a certain capacity can be formed by adopting the protective cylinder, and the cement soil extruded in the construction process can be stored in the embedded hole without overflowing out of the hole and being not required to be treated; the positioning cover can not only stabilize the precast pile when the precast pile is butted, but also ensure that the precast pile is smoothly sent into the pile hole when the precast pile is sent.
Description
Technical Field
The invention belongs to the technical field of static drilling root-planting pile construction, and particularly relates to a positioning casing device and a static drilling root-planting pile construction method using the same.
Background
A static drilling root-planting pile is a novel pile foundation construction process, wherein a root-planting pile drilling machine and a crawler crane are matched for construction, the specific construction process comprises the steps of firstly adopting the root-planting pile drilling machine to drill holes and perform pile end reaming, lifting a drilling rod while injecting cement paste after the drilling is completed, then adopting the crawler crane to lift a precast pile to perform pile sinking and pile splicing, and finally forming a pile.
The static drill root planting pile integrates the advantages of various traditional processes such as a cast-in-situ bored pile, a precast pile, a mixing pile, a club-footed pile and the like, has the advantages of good pile body quality, no soil squeezing effect, high construction efficiency, low noise, relatively small slurry discharge amount and the like, and is more and more widely applied.
1. In the root planting pile construction process, although a conventional slurry retaining wall is not needed, cement slurry with about 1/3 pore volume needs to be injected into the hole, and then the prefabricated pile with the same length and the diameter slightly smaller than the pile hole needs to be planted into the hole, so that a large amount of cement soil overflows out of the hole due to the entering of the cement slurry and the prefabricated pile, and cement slurry pollution and resource waste are caused.
2. When the pile splicing is carried out by adopting a crane to hoist the upper pile section and the lower pile section, the upper pile section and the lower pile section are in a hoisting state, the stability is poor, the control is difficult, the pile splicing difficulty is high, the quality is poor, the efficiency is low, the dislocation deviation required by the common pile splicing is not more than 2mm, if the deviation is overlarge, the pile breaking condition can occur after the load bearing, and the building safety is influenced.
3. The time consumed by the crawler crane for completing pile sinking and pile splicing construction is far shorter than the time required by the root planting pile drilling machine for completing drilling, reaming and grouting, so that the working efficiency of the crawler crane cannot be fully exerted, the machine class waste is caused, sometimes, in order to save the cost, a method of matching one crawler crane with two root planting pile drilling machines for construction is adopted, the advancing distance of the crawler crane can be increased, and the energy consumption is greatly improved.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides the positioning pile casing device and the static drilling rooted pile construction method using the same, which can optimize the static drilling rooted pile construction process flow and improve the construction efficiency.
The positioning pile casing device comprises a pile casing and a positioning cover, wherein the positioning cover is positioned above the pile casing, a circle of placing blocks are arranged on the circumferential side wall of the positioning cover, clamping grooves matched with the opening wall of the pile casing are arranged on the placing blocks, and the positioning cover is clamped on the opening wall of the pile casing through the clamping grooves; the center of the cover surface of the positioning cover is provided with a positioning opening, and a precast pile can be inserted through the positioning opening.
The positioning cylinder protecting device has the beneficial effects that: compared with the prior art, the embedded hole with a certain capacity can be formed by arranging the protective cylinder and the positioning cover, and the cement soil extruded in the construction process can be stored in the embedded hole without overflowing out of the hole and being not required to be treated; the positioning cover can not only stabilize the precast pile when the precast pile is butted, but also ensure that the precast pile is smoothly sent into the pile hole when the precast pile is sent.
Preferably, the cover surface of the positioning cover is inclined downwards from the side wall of the positioning cover to the positioning opening; therefore, the cover surface can play a role in guiding the precast pile in the pile sinking process.
Preferably, the cover surface is provided with a limiting cylinder, and the limiting cylinder is communicated with the positioning port and is positioned below the positioning port; the pile sinking position of the precast pile is ensured in the pile sinking process of the precast pile by arranging the limiting barrel.
Preferably, the central line of the limiting cylinder and the central line of the protecting cylinder are collinear; therefore, the perpendicularity of the precast pile can be ensured in the pile sinking process of the precast pile.
Preferably, the placing block is provided with two hanging rings, and the hanging rings are symmetrically distributed along the center of the positioning cover; the hoisting of the positioning cover is facilitated through the hoisting rings, the hoisting rings are symmetrically distributed, the stability is better in the hoisting process, and the safety performance is greatly improved.
A static drill rooted pile construction method using the positioning casing device as described in any one of the above, comprising the steps of:
s1, determining pile positions for static drilling rooted pile construction, respectively inserting pile casings into two adjacent pile positions, wherein the pile casings are inserted into a stratum by taking the pile positions as centers, and the open ends of the pile casings are exposed out of the stratum;
s2, taking out the soil body in the pile casing by using a soil sampler to form a pre-buried hole, dropping the positioning cover by using a crawler crane and placing the positioning cover on the opening wall of one of the pile casings, and simultaneously completing hole drilling and reaming and grouting in the pile position of the other pile casing by using a root pile planting drilling machine;
s3, pile extension of the precast piles is completed in the pile casing provided with the positioning cover, when the precast piles are connected, a lower section of precast pile penetrates through a positioning opening of the positioning cover and then is conveyed into a pre-buried hole to complete limiting and fixing, meanwhile, the connection position of the precast pile is located on the ground, and then an upper section of precast pile is hoisted by a crawler crane to butt joint the upper section of precast pile with the lower section of precast pile and is placed in a positioning pile casing device to be cooled;
s4, installing a positioning cover on the pile casing at the pile position after hole drilling, reaming and grouting, hoisting the butted precast pile by a crawler crane, and sinking the precast pile at the pile position after hole drilling and grouting along a positioning opening on the positioning cover, namely completing construction of static drilling root-planting pile;
s5, moving the drilling machine of the root planting pile to the pre-buried hole without drilling and reaming in the step S2, simultaneously hoisting the positioning cover and the pile casing which are subjected to static root planting pile drilling construction by the crawler crane, moving the crawler crane to the next pile position, inserting the pile casing into the pile position, performing pre-buried hole construction in the step S2, and placing the positioning cover; and simultaneously, dropping the positioning cover on the pre-buried hole without drilling and reaming through the crawler crane, completing drilling and reaming and grouting through the root planting pile drilling machine, and finally sequentially performing the steps according to the steps S3 and S4.
The construction method has the beneficial effects that: on the determined pile positions for static drilling root grafting pile construction, drilling and reaming and grouting construction can be simultaneously carried out on the two pile positions respectively, pile splicing construction of precast piles is completed, and construction can be sequentially carried out according to the step 5, so that the method has the advantages of optimizing the static drilling root grafting pile construction process flow, improving the construction efficiency and reducing equipment shift waste; through the construction method of the five steps, 1, through setting the pre-buried hole, the original soil in the pre-buried hole is taken out in advance, so that the cement soil extruded in the construction process is retained in the pre-buried hole and cannot overflow out of the hole, and the problem of mud pollution is thoroughly eliminated; 2. the welding of the precast pile is completed in the pre-buried hole in advance, the precast pile can be fixed, the welding process is controllable, the cooling time is sufficient, the connecting difficulty of the precast pile is greatly reduced, and the welding quality is stable and reliable; 3. the construction of the pre-buried hole is carried out by the crawler crane, the welding and cooling of the precast pile can be completed in the pre-buried hole which is constructed firstly, then the precast pile is integrally lifted by the crane and implanted into the pile hole which is being constructed, the flow construction steps are optimized, and the equipment work efficiency is improved.
Preferably, in the step S4, in the precast pile sinking process, part of cement soil in the drilled and expanded hole after grouting overflows into the embedded hole; the precast pile can slide into the positioning opening under the guiding action of the cover surface and vertically enter the drilled and expanded hole along the limiting cylinder; the cement soil extruded in the construction process can be stored in the embedded hole, does not overflow out of the hole, and does not need to be processed; meanwhile, the perpendicularity and smoothness of the precast pile in the pile sinking process can be better through the cover surface, the positioning opening and the limiting barrel.
Preferably, the central line of the limiting cylinder and the central line of the drilling and reaming hole are collinear; therefore, in the pile sinking process of the precast pile, the precast pile can smoothly enter the drilled and expanded hole, and meanwhile, the smooth insertion between the precast pile and the drilled and expanded hole is ensured.
Drawings
Fig. 1 is a schematic front view of the positioning casing device of the present invention.
Fig. 2 is a schematic front view of the positioning cover of the present invention.
Fig. 3 is a schematic top view of the positioning cover of the present invention.
Fig. 4 is a structural schematic diagram of the step S1 in the static drilling rooted pile planting construction method of the present invention.
Fig. 5 is a structural schematic diagram of the step S2 in the static drilling rooted pile planting construction method of the present invention.
Fig. 6 is a structural schematic diagram of the steps S2 and S3 in the static drilling root-planting pile construction method of the invention.
Fig. 7 is a structural schematic diagram of a step S4 in the static drilling rooted pile planting construction method of the present invention.
Fig. 8 is a structural schematic diagram of the step S4 in the static drilling rooted pile planting construction method of the present invention.
Fig. 9 is a structural schematic diagram of the step S4 in the static drilling rooted pile planting construction method of the present invention.
The reference numbers in the figures are respectively: 1. protecting the cylinder; 2. a positioning cover; 3. pre-burying holes; 4. drilling and reaming; 5. lower-section precast piles; 6. prefabricating the upper section of the pile; 21. placing the blocks; 22. a card slot; 23. covering; 24. positioning the opening; 25. a limiting cylinder; 26. a lifting ring.
Detailed Description
The invention will be described in detail below with reference to the following drawings: the invention comprises a pile casing 1 and a positioning cover 2, wherein the pile casing 1 is a steel pipe, and the diameter of the pile casing 1 is larger than that of a precast pile; the positioning cover 2 is positioned above the protecting cylinder 1, a circle of laying block 21 is arranged on the circumferential side wall of the positioning cover 2, a clamping groove 22 matched with the opening wall of the protecting cylinder 1 is arranged on the laying block 21, and the positioning cover 2 is clamped on the opening wall of the protecting cylinder 1 through the clamping groove 22; the center of the cover surface 23 of the positioning cover 2 is provided with a positioning opening 24, and a precast pile can be inserted through the positioning opening 24.
The cover surface 23 of the positioning cover 2 slopes downward along the side wall of the positioning cover 2 to the positioning opening 24, so that the entire positioning cover 2 is funnel-shaped in cross section.
Be equipped with spacing section of thick bamboo 25 on capping 23, spacing section of thick bamboo 25 communicates with each other with location mouth 24 to be located the below of location mouth 24, the diameter of spacing section of thick bamboo 25 is greater than the diameter of precast pile, and the tolerance between the two is generally 5cm, more is favorable to guaranteeing the pile sinking position of precast pile in the precast pile sinking process, and the precast pile is difficult to take place the deviation of slope at the pile sinking in-process.
The central line of the limiting cylinder 25 is collinear with the central line of the protecting cylinder 1, and the limiting cylinder 25 is positioned at the right center of the protecting cylinder 1.
Two hanging rings 26 are arranged on the placing block 21, the hanging rings 26 are symmetrically distributed along the center of the positioning cover 2, and the hanging rings 26 are directly welded on the placing block 21.
A static drilling rooted pile construction method using a positioning pile casing device comprises the following steps:
s1, determining pile positions for static drilling rooted pile construction, wherein the pile positions can be determined in advance to facilitate subsequent construction, inserting pile casings 1 into two adjacent pile positions respectively, inserting the pile casings 1 into a stratum by taking the pile positions as centers, and exposing the open ends of the pile casings 1 out of the stratum; in the process of pressing the pile casing 1 into the stratum through the pile pressing machine, the vertical pressing is ensured, the center line of the limiting cylinder 25 and the center line of the drilled and expanded hole 4 are collinear, and therefore the subsequent precast pile is ensured not to deflect when being sunk;
s2, taking out the soil body in the pile casing 1 by using a soil sampler to form a pre-buried hole 3, wherein the bottom of the pre-buried hole 3 is flush with or slightly lower than the bottom of the pile casing 1; dropping the positioning cover 2 by a crawler crane and placing the positioning cover on the opening wall of one of the pile casings 1, ensuring that the clamping groove 22 on the positioning cover 2 is clamped on the opening wall of the pile casing 1, and simultaneously completing hole drilling and reaming 4 and grouting in the pile position of the other pile casing 1 by a root planting pile drilling machine;
s3, pile extension of the precast pile is completed in the pile casing 1 with the positioning cover 2, when the precast pile is connected, the lower section of precast pile 5 penetrates through the positioning opening 24 of the positioning cover 2 and then is conveyed into the embedded hole 3 to complete limiting and fixing, meanwhile, the precast pile connection position is located on the ground, welding of the upper section of precast pile and the lower section of precast pile in the butt joint process in the construction process is facilitated, and then the upper section of precast pile 6 is hoisted through a crawler to carry out butt joint on the upper section of precast pile and the lower section of precast pile and is placed in the positioning pile casing device to be cooled;
s4, installing a positioning cover 2 on the pile casing 1 at the pile position after hole drilling and reaming 4 and grouting, hoisting the butted precast pile by a crawler crane, and sinking the precast pile at the pile position after hole drilling and reaming 4 and grouting along a positioning opening 24 on the positioning cover 2, namely completing construction of static drilling root and pile planting;
s5, moving the root planting pile drilling machine to the position of the pre-buried hole 3 without drilling the reaming hole 4 in the step S2, meanwhile, hoisting the positioning cover 2 and the pile casing 1 which finish the static root planting pile drilling construction by the crawler crane, moving the crawler crane to the next pile position, inserting the pile casing 1 into the pile position, constructing the pre-buried hole 3 in the step S2, and placing the positioning cover 2; and meanwhile, the positioning cover 2 on the pre-buried hole 3 without the drilled hole 4 is lifted through the crawler crane, the drilled hole 4 is drilled and grouting is completed through the root planting pile drilling machine, and finally the steps S3 and S4 are sequentially carried out.
In the step S4, in the precast pile sinking process, part of cement soil in the drilled and reamed hole 4 after grouting overflows into the embedded hole 3, and the cement soil extruded in the construction process can be stored in the embedded hole without overflowing out of the hole, so that the cement soil is not required to be treated, and the cement soil pollution and the resource waste are not caused; and the precast pile can slide into the positioning opening 24 through the guiding function of the cover surface 23 and vertically enter the drilling and expanding hole 4 along the limiting cylinder 25, and meanwhile, the perpendicularity and smoothness of the precast pile in the pile sinking process can be better through the cover surface, the positioning opening and the limiting cylinder.
The present invention is not limited to the above embodiments, and any changes in the shape or material composition, or any changes in the structural design provided by the present invention, are all modifications of the present invention, and should be considered within the scope of the present invention.
Claims (8)
1. The utility model provides a location protects a device, protects a section of thick bamboo (1) and location lid (2), its characterized in that: the positioning cover (2) is positioned above the protective cylinder (1), a circle of placing blocks (21) are arranged on the circumferential side wall of the positioning cover (2), clamping grooves (22) matched with the opening wall of the protective cylinder (1) are formed in the placing blocks (21), and the positioning cover (2) is clamped on the opening wall of the protective cylinder (1) through the clamping grooves (22); the center of the cover surface (23) of the positioning cover (2) is provided with a positioning opening (24), and a precast pile can be inserted through the positioning opening (24).
2. The positioning casing device of claim 1, wherein: the cover surface (23) of the positioning cover (2) inclines downwards from the side wall of the positioning cover (2) to the positioning opening (24).
3. A positioning casing device according to claim 1 or 2, wherein: and a limiting cylinder (25) is arranged on the cover surface (23), and the limiting cylinder (25) is communicated with the positioning opening (24) and is positioned below the positioning opening (24).
4. The positioning casing device of claim 3, wherein: the central line of the limiting cylinder (25) and the central line of the protecting cylinder (1) are collinear.
5. The positioning casing device of claim 1, wherein: two hanging rings (26) are arranged on the placing block (21), and the hanging rings (26) are symmetrically distributed along the center of the positioning cover (2).
6. A static drilling rooted pile construction method using the positioning casing device according to any one of claims 1 to 5, wherein: the static drill root-planting pile construction method comprises the following steps:
s1, pile positions of static drill root-planting pile construction are determined, pile casings (1) are inserted into two adjacent pile positions respectively, the pile casings (1) are inserted into a stratum by taking the pile positions as centers, and the open ends of the pile casings (1) are exposed out of the stratum;
s2, taking out soil in the pile casings (1) by using a soil sampler to form a pre-buried hole (3), dropping a positioning cover (2) by using a crawler crane and placing the positioning cover on the opening wall of one pile casing (1), and drilling and reaming (4) and grouting in the pile position of the other pile casing (1) by using a root planting pile drilling machine;
s3, pile extension of the precast pile is completed in the pile casing (1) provided with the positioning cover (2), when the precast pile is connected, a lower section of precast pile (5) penetrates through a positioning opening (24) of the positioning cover (2) and then is conveyed into a pre-buried hole (3) to complete limiting and fixing, meanwhile, the connection position of the precast pile is located on the ground, and then an upper section of precast pile (6) is hoisted through a crawler crane to carry out butt joint on the upper section of precast pile and the lower section of precast pile and is placed in a positioning pile casing device to be cooled;
s4, installing a positioning cover (2) on the pile casing (1) at the pile position where hole drilling (4) and grouting are completed, hoisting the butted precast pile through a crawler crane, and sinking the precast pile at the pile position where hole drilling (4) and grouting are completed along a positioning opening (24) in the positioning cover (2) along the precast pile, namely completing construction of static root drilling and pile planting;
s5, moving a root planting pile drilling machine to the position of the pre-buried hole (3) without drilling and reaming (4) in the step S2, meanwhile, hoisting the positioning cover (2) and the pile casing (1) which are subjected to static root planting pile drilling construction by the crawler crane, moving the crawler crane to the next pile position, inserting the pile casing (1) into the pile position, constructing the pre-buried hole (3) in the step S2, and placing the positioning cover (2); meanwhile, the positioning cover (2) on the pre-buried hole (3) without drilling the hole (4) is lifted by the crawler crane, the hole (4) is drilled and grouted by the root planting pile drilling machine, and finally the steps of S3 and S4 are carried out in sequence.
7. The static drilling root-planting pile construction method of the positioning casing device according to claim 6, characterized in that: in the step S4, in the precast pile sinking process, part of cement soil in the drilled and expanded hole (4) after grouting overflows into the embedded hole (3); and the precast pile can slide into the positioning opening (24) through the guiding action of the cover surface (23) and vertically enter the drilling and expanding hole (4) along the limiting cylinder (25).
8. The static drilling rooted pile planting construction method of the positioning casing device according to claim 7, wherein: the central line of the limiting cylinder (25) is collinear with the central line of the drilling and reaming hole (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210875956.0A CN115198770A (en) | 2022-07-25 | 2022-07-25 | Positioning pile casing device and static drilling rooted pile construction method using same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210875956.0A CN115198770A (en) | 2022-07-25 | 2022-07-25 | Positioning pile casing device and static drilling rooted pile construction method using same |
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| CN115198770A true CN115198770A (en) | 2022-10-18 |
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| CN202210875956.0A Pending CN115198770A (en) | 2022-07-25 | 2022-07-25 | Positioning pile casing device and static drilling rooted pile construction method using same |
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| CN (1) | CN115198770A (en) |
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| CN113914314A (en) * | 2020-07-07 | 2022-01-11 | 宁波大学 | Construction method of static drilling root-planting drainage pile |
| CN114059921A (en) * | 2021-11-17 | 2022-02-18 | 广州铁路投资建设集团有限公司 | Hole-forming construction process for cast-in-place pile in karst strong development area |
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