CN113153188A - Device for performing secondary hole cleaning on cast-in-place pile by adopting enlarged pipe orifice and hole cleaning method - Google Patents
Device for performing secondary hole cleaning on cast-in-place pile by adopting enlarged pipe orifice and hole cleaning method Download PDFInfo
- Publication number
- CN113153188A CN113153188A CN202110450178.6A CN202110450178A CN113153188A CN 113153188 A CN113153188 A CN 113153188A CN 202110450178 A CN202110450178 A CN 202110450178A CN 113153188 A CN113153188 A CN 113153188A
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- cast
- hole
- pouring
- hole cleaning
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- 238000004140 cleaning Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims description 11
- 239000002002 slurry Substances 0.000 claims abstract description 29
- 238000009434 installation Methods 0.000 claims abstract description 17
- 239000013049 sediment Substances 0.000 claims abstract description 13
- 239000004576 sand Substances 0.000 claims description 21
- 239000002893 slag Substances 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 6
- 230000002787 reinforcement Effects 0.000 claims description 5
- 210000001503 joint Anatomy 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 6
- 210000003437 trachea Anatomy 0.000 abstract description 4
- 238000001914 filtration Methods 0.000 abstract 2
- 239000011440 grout Substances 0.000 abstract 1
- 238000005266 casting Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000012669 compression test Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
-
- E—FIXED CONSTRUCTIONS
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
- E21B21/063—Arrangements for treating drilling fluids outside the borehole by separating components
- E21B21/065—Separating solids from drilling fluids
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Structural Engineering (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The utility model provides an adopt and enlarge the device that the mouth of pipe carries out bored concrete pile secondary clear hole, including high-pressure gas pitcher, air compressor machine and sandstone filtration ware, high-pressure gas pitcher pass through the connecting pipe and be connected with the air compressor machine, be equipped with the control valve on the connecting pipe, high-pressure gas pitcher passes through the second hose and is connected with trachea installation device, be equipped with three-way structure on the trachea installation device, trachea installation device is including fixed pipe, the cover has three-way structure including being responsible for and setting up the branch pipe above that on the fixed pipe, the both ends of being responsible for cooperate with vex head and pouring pipe respectively, be equipped with the adjusting device who goes up and down rather than the cooperation on the pouring pipe, be equipped with the first hose of being connected with fixed pipe in the pouring pipe, the bottom of pouring pipe is equipped with and enlarges the socle, be equipped with the flange of being connected with the pipe of slagging tap on the branch pipe, the sandstone filtration ware is equipped with the grout return. By adopting the structure, the secondary hole cleaning before the pouring of the cast-in-place pile concrete is ensured, the sediment meets the design requirement, the slurry quality is excellent, and the good bearing capacity of the cast-in-place pile is ensured.
Description
Technical Field
The invention relates to the technical field of hole cleaning of cast-in-place piles, in particular to a device and a hole cleaning method for performing secondary hole cleaning of cast-in-place piles by adopting an enlarged pipe orifice.
Background
With the rapid development of urbanization and large traffic, cast-in-situ bored piles are widely used as reliable foundation bearing structures. The bored concrete pile is formed into a hole in the silty clay, sandstone and mudstone stratum, more clay grains and fine sand grains are mixed in the slurry, and the components are easy to suspend in the slurry. After the reinforcement cage is arranged below the reinforcement cage, sand and drill slag in slurry in the hole can be deposited at the bottom of the hole, and the bearing capacity of the cast-in-place pile is affected. The existing method for cleaning holes for the second time by using the air lift reverse circulation of a pouring guide pipe only can clean the range of the diameter of the bottom of the guide pipe which is less than 50cm, and the hole cleaning effect is not good. In the engineering example, quality problems that secondary hole cleaning acceptance of the cast-in-place pile is unqualified, core and sediment at the bottom of the cast-in-place pile are too thick, bearing capacity of a cast-in-place pile compression test is insufficient and the like often occur.
Disclosure of Invention
The invention aims to solve the technical problem of providing a device for secondary hole cleaning of a cast-in-place pile by adopting an enlarged pipe orifice and a hole cleaning method, wherein the method comprises the steps of disturbing slurry in a hole in advance by adopting positive circulation, covering a flared bottom pipe at the bottom of the whole hole, purifying the slurry and cleaning sediments at the bottom of the hole by using a gas lift reverse circulation and an air compressor, ensuring that the sediments after secondary hole cleaning meet the design requirements and the slurry quality is excellent before the cast-in-place pile concrete is cast, and ensuring that the sediments at the bottom of the cast-in-place pile meet the design requirements and the bearing capacity of the cast-in-place pile is good.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a device for performing secondary hole cleaning on a cast-in-place pile by adopting an enlarged pipe orifice comprises a high-pressure gas tank, an air compressor and a sandstone filter, wherein the high-pressure gas tank is connected with the air compressor through a connecting pipe, the connecting pipe is provided with a control valve, the high-pressure gas tank is connected with an air pipe installation device through a second hose, the air pipe installation device is provided with a three-way structure, the air pipe installation device comprises a fixed pipe, the fixed pipe is provided with a butt joint pipe, a plurality of groups of hanging rings and a choke plug which are connected with the second hose, the fixed pipe is sleeved with the three-way structure and comprises a main pipe and a branch pipe arranged on the main pipe, two ends of the main pipe are respectively matched with the choke plug and a casting pipe, the casting pipe is provided with an adjusting device which is matched with the casting pipe to lift, the casting pipe is internally provided with a first hose connected with the fixed pipe, the bottom of the casting pipe is provided with an enlarged pipe bottom, the branch pipe is provided with a connecting flange connected with a slag discharge pipe, and the slag discharge pipe is connected with the sandstone filter, the sand filter is provided with a slurry return pipe.
In the preferred scheme, the inner diameter of the pouring guide pipe is two hundred fifty to three hundred millimeters, and the pouring guide pipe, the tee structure and the choke plug are connected through screw threads.
In a preferred scheme, a fixed joint is arranged on the fixed pipe.
In a preferred scheme, the bottom of the enlarged tube is a bell mouth, the angle between a generatrix of the bell mouth and the horizontal plane is forty-five degrees, and the bottom of the bell mouth is provided with a saw-toothed structure.
The device for performing secondary hole cleaning on the cast-in-place pile by adopting the enlarged pipe orifice and the hole cleaning method provided by the invention have the following beneficial effects by adopting the structure:
(1) the mud in the hole is disturbed in advance by adopting positive circulation, so that the quality of the mud after hole cleaning is ensured to be excellent;
(2) the flaring bottom pipe covers the whole hole bottom, so that the construction efficiency and effect are greatly improved;
(3) the gas lift reverse circulation and the air compressor are used for purifying the slurry and cleaning sediments at the bottom of the hole, so that the design requirements of secondary hole cleaning before pouring the cast-in-place pile concrete and the requirement on sediments after secondary hole cleaning are met, and the slurry quality is excellent.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic view of the overall structure of the apparatus of the present invention.
Fig. 2 is a schematic structural view of the trachea installation device of the invention.
FIG. 3 is a schematic view of a tee structure of the present invention.
Fig. 4 is a schematic plan view of an enlarged bottom structure of the tube of the present invention.
Fig. 5 is a perspective view of the enlarged bottom structure of the tube of the present invention.
In the figure: the method comprises the following steps of pouring a guide pipe 1, an enlarged pipe bottom 2, a first hose 3, a hanging ring 4, an abutting pipe 5, a three-way structure 6, a choke plug 7, a fixed joint 8, an adjusting device 9, a high-pressure gas tank 10, an air compressor 11, a connecting pipe 12, a control valve 13, a slag discharging pipe 14, a sand filter 15, a slurry return pipe 16, sand 17, a pouring hole 18, sediment 19, a pouring pile reinforcement cage 20, a second hose 21, a main pipe 22, a branch pipe 23, a connecting flange 24, a screw thread 25, a sawtooth-shaped structure 26, a fixed pipe 27 and a gas pipe installation device 28.
Detailed Description
The first embodiment is as follows:
as shown in fig. 1-5, a device for performing secondary hole cleaning of a cast-in-place pile by using an enlarged pipe orifice comprises a high-pressure gas tank 10, an air compressor 11 and a sand filter 15, wherein the high-pressure gas tank 10 is connected with the air compressor 11 through a connecting pipe 12, the connecting pipe 12 is provided with a control valve 13, the high-pressure gas tank 10 is connected with an air pipe installation device 28 through a second hose 21, the air pipe installation device 28 is provided with a three-way structure 6, the air pipe installation device 28 comprises a fixed pipe 27, the fixed pipe 27 is provided with a butt joint pipe 5 connected with the second hose 21, a plurality of groups of lifting rings 4 and choke plugs 7, the fixed pipe 27 is sleeved with the three-way structure 6 and comprises a main pipe 22 and a branch pipe 23 arranged thereon, two ends of the main pipe 22 are respectively matched with the choke plugs 7 and a cast pipe 1, the cast pipe 1 is provided with an adjusting device 9 matched with the cast pipe 1 to lift, the cast pipe 1 is internally provided with a first hose 3 connected with the fixed pipe 27, the bottom of the pouring guide pipe 1 is provided with an expanded pipe bottom 2, the branch pipe 23 is provided with a connecting flange 24 connected with the slag discharging pipe 14, the slag discharging pipe 14 is connected with a sand filter 15, and the sand filter 15 is provided with a slurry return pipe 16.
In a preferred scheme, the inner diameter of the pouring guide pipe 1 is two hundred fifty to three hundred millimeters, and the pouring guide pipe 1, the three-way structure 6 and the choke plug 7 are connected through screw threads 25. The practicality is strong, and the installation and use are convenient.
In a preferred scheme, a fixed joint 8 is arranged on the fixed pipe 27. The working stability is ensured, and the practicability is high.
In the preferred scheme, the bottom of the enlarged tube bottom 2 is a bell mouth, the angle between the generatrix of the bell mouth and the horizontal plane is forty-five degrees, and the bottom of the bell mouth is provided with a saw-toothed structure 26. The coverage is big, and clear hole is effectual, promotes work efficiency.
Example two:
the hole cleaning method of the device for performing secondary hole cleaning on the cast-in-place pile by using the enlarged pipe orifice as shown in the figures 1 to 5 comprises the following steps:
firstly, arranging a cast-in-place pile reinforcement cage 20 below the interior of a cast-in-place hole 18, then installing and connecting the flaring bottom pipe 2 with the bottom of a cast-in-place guide pipe 1, and arranging the flaring bottom pipe 2 below an adjusting device 9 to a position with a distance of fifty centimeters from the bottom of the cast-in-place hole 18;
secondly, installing a tee joint structure 6 at the top of the pouring guide pipe 1, connecting the bottom of a main pipe 22 in the tee joint structure 6 with the pouring guide pipe 1 through a screw thread 25, installing an air pipe installation device 28 at the top of the main pipe 22 and communicating the air compressor 11 through a pipeline, then connecting a slurry return pipe 16 on a sand filter 15 with a branch pipe 23, then opening the slurry return pipe 11, injecting slurry into the bottom of a pouring hole 18 through the pouring guide pipe 1, disturbing the slurry in a positive circulation mode, and closing the slurry return pipe 16 after the slurry is disturbed;
thirdly, removing the slurry return pipe 16 on the sand filter 15 from the branch pipe 23, installing the slurry return pipe 16 at the orifice of the filling hole 18, connecting the slag discharge pipe 14 of the sand filter 15 with the branch pipe 23, then opening the air compressor 11 and the sand filter 15, starting reverse circulation hole cleaning for thirty to sixty minutes, and discharging sand 17;
and fourthly, suspending the air compressor 11 and the sandstone filter 15, setting the flaring bottom pipe 2 to the position of five centimeters at the bottom of the hole 18 of the filling hole through the adjusting device 9, then fixing, opening the air compressor 11 and the sandstone filter 15 again, continuing to perform reverse circulation hole cleaning for thirty to sixty minutes, finishing cleaning the sediment 19 in the hole bottom of the hole 18 of the filling hole, and realizing secondary hole cleaning of the filling pile.
Example three:
the enlarged bottom 2 of the pipe as shown in fig. 4-5 is made of steel and is formed in a steel structure processing field at one time. The wall thickness of the expanded bottom pipe 2 is consistent with that of the pouring guide pipe 1, the diameter of the bottom of the bell mouth of the bottom pipe is D-0.4m, the angle between a bus of the bell mouth and the horizontal plane is 45 degrees, the bottom of the bell mouth is in a zigzag shape, and a notch with the width of 10cm and the height of 5cm is manufactured every 30 cm; the diameter of the top of the bell mouth of the bottom pipe is consistent with that of the pouring guide pipe 8, and the length of the vertical part of the bottom pipe is 50 cm.
The invention has the beneficial effects that: the method has the advantages that the mud in the hole is disturbed in advance by adopting positive circulation, the flaring bottom pipe covers the whole hole bottom, the gas lift reverse circulation and the air compressor are used for purifying the mud and cleaning the sediment at the hole bottom, the secondary sediment cleaning before the pouring of the cast-in-place pile concrete meets the design requirement and ensures that the quality of the mud is excellent, and the sediment at the bottom of the cast-in-place pile meets the design requirement and the bearing capacity of the cast-in-place pile is good.
Claims (5)
1. The utility model provides an adopt and enlarge the device that the mouth of pipe carries out clear hole of bored concrete pile secondary, includes high-pressure gas pitcher (10), air compressor machine (11) and gravel and sand filter (15), its characterized in that: the high-pressure gas tank (10) is connected with an air compressor (11) through a connecting pipe (12), a control valve (13) is arranged on the connecting pipe (12), the high-pressure gas tank (10) is connected with an air pipe installation device (28) through a second hose (21), a tee joint structure (6) is arranged on the air pipe installation device (28), the air pipe installation device (28) comprises a fixed pipe (27), a butt joint pipe (5) connected with the second hose (21) is arranged on the fixed pipe (27), a plurality of groups of lifting rings (4) and choke plugs (7) are arranged on the fixed pipe (27), the tee joint structure (6) comprises a main pipe (22) and a branch pipe (23) arranged on the main pipe (22), two ends of the main pipe (22) are respectively matched with the choke plugs (7) and a pouring guide pipe (1), an adjusting device (9) matched with the pouring guide pipe (1) to lift is arranged on the pouring guide pipe (1), a first hose (3) connected with the fixed pipe (27) is arranged in the pouring guide pipe (1), the bottom of the pouring guide pipe (1) is provided with an enlarged pipe bottom (2), the branch pipe (23) is provided with a connecting flange (24) connected with the slag discharging pipe (14), the slag discharging pipe (14) is connected with a sand filter (15), and the sand filter (15) is provided with a slurry return pipe (16).
2. The device for performing secondary hole cleaning on the cast-in-place pile by using the enlarged pipe orifice according to claim 1, is characterized in that: the inner diameter of the pouring guide pipe (1) is two hundred fifty to three hundred millimeters, and the pouring guide pipe (1), the tee joint structure (6) and the choke plug (7) are connected through screw threads (25).
3. The device for performing secondary hole cleaning on the cast-in-place pile by using the enlarged pipe orifice according to claim 1, is characterized in that: the fixed pipe (27) is provided with a fixed joint (8).
4. The device for performing secondary hole cleaning on the cast-in-place pile by using the enlarged pipe orifice according to claim 1, is characterized in that: the bottom of the enlarged tube bottom (2) is a bell mouth, the angle between a bell mouth bus and the horizontal plane is forty-five degrees, and the bottom of the bell mouth is provided with a saw-toothed structure (26).
5. The method for cleaning the hole of the device for performing the secondary hole cleaning on the cast-in-place pile by using the enlarged pipe orifice as claimed in any one of claims 1 to 4, which is characterized by comprising the following steps of:
firstly, arranging a cast-in-place pile reinforcement cage (20) below a cast-in-place hole (18), then installing and connecting a flaring bottom pipe (2) with the bottom of a cast-in-place guide pipe (1), and arranging the flaring bottom pipe (2) below the cast-in-place hole (18) to a position with a bottom distance of fifty centimeters through an adjusting device (9);
secondly, installing a tee joint structure (6) at the top of the pouring guide pipe (1), connecting the bottom of a main pipe (22) in the tee joint structure (6) with the pouring guide pipe (1) through a screw thread (25), installing an air pipe installation device (28) at the top of the main pipe (22) and communicating the air compressor (11) through a pipeline, then connecting a slurry return pipe (16) on the sand filter (15) with a branch pipe (23), then opening the slurry return pipe (11), injecting slurry into the bottom of a pouring hole (18) through the pouring guide pipe (1), disturbing the slurry in a positive circulation mode, and closing the slurry return pipe (16) after the slurry is disturbed;
thirdly, a slurry return pipe (16) on the sand filter (15) is detached from the branch pipe (23), the slurry return pipe (16) is installed at the hole opening of the filling hole (18), a slag discharge pipe (14) of the sand filter (15) is connected with the branch pipe (23), then an air compressor (11) and the sand filter (15) are opened, reverse circulation hole cleaning is started, the hole cleaning time is thirty-sixty minutes, and sand (17) is discharged;
and fourthly, suspending the air compressor (11) and the sandstone filter (15), setting the flaring bottom pipe (2) to the bottom of the filling hole (18) through the adjusting device (9) for five centimeters, then opening the air compressor (11) and the sandstone filter (15) again, continuing to perform reverse circulation hole cleaning, wherein the hole cleaning time is thirty to sixty minutes, finishing the cleaning of the sediment 19 in the bottom of the filling hole (18), and realizing the secondary hole cleaning of the filling pile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110450178.6A CN113153188A (en) | 2021-04-25 | 2021-04-25 | Device for performing secondary hole cleaning on cast-in-place pile by adopting enlarged pipe orifice and hole cleaning method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110450178.6A CN113153188A (en) | 2021-04-25 | 2021-04-25 | Device for performing secondary hole cleaning on cast-in-place pile by adopting enlarged pipe orifice and hole cleaning method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113153188A true CN113153188A (en) | 2021-07-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110450178.6A Pending CN113153188A (en) | 2021-04-25 | 2021-04-25 | Device for performing secondary hole cleaning on cast-in-place pile by adopting enlarged pipe orifice and hole cleaning method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113153188A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115142421A (en) * | 2022-08-09 | 2022-10-04 | 中国建筑第八工程局有限公司 | Guide row device for pouring cast-in-place pile and guide row method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100880439B1 (en) * | 2007-07-23 | 2009-01-29 | 대한주택공사 | Apparatus and method for removing slime in a cast-in place pile construstion |
| CN110043205A (en) * | 2019-05-16 | 2019-07-23 | 深圳市工勘岩土集团有限公司 | Bored concrete pile secondary pile hole cleaning method |
| CN111042753A (en) * | 2019-12-13 | 2020-04-21 | 中国葛洲坝集团市政工程有限公司 | Device and method for secondary hole cleaning of underground wall connecting groove section by utilizing pouring guide pipe |
| CN112096323A (en) * | 2020-09-16 | 2020-12-18 | 湖北工建基础设施建设有限公司 | Construction system and method for slurry-free clear water pore-forming of cast-in-situ bored pile |
| CN212428664U (en) * | 2020-05-29 | 2021-01-29 | 浙大城市学院 | Hole cleaning device for cast-in-situ bored pile |
| CN212985144U (en) * | 2020-09-01 | 2021-04-16 | 湖北工建基础设施建设有限公司 | Hole cleaning device for pumping reverse circulation of cast-in-situ bored pile |
-
2021
- 2021-04-25 CN CN202110450178.6A patent/CN113153188A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100880439B1 (en) * | 2007-07-23 | 2009-01-29 | 대한주택공사 | Apparatus and method for removing slime in a cast-in place pile construstion |
| CN110043205A (en) * | 2019-05-16 | 2019-07-23 | 深圳市工勘岩土集团有限公司 | Bored concrete pile secondary pile hole cleaning method |
| CN111042753A (en) * | 2019-12-13 | 2020-04-21 | 中国葛洲坝集团市政工程有限公司 | Device and method for secondary hole cleaning of underground wall connecting groove section by utilizing pouring guide pipe |
| CN212428664U (en) * | 2020-05-29 | 2021-01-29 | 浙大城市学院 | Hole cleaning device for cast-in-situ bored pile |
| CN212985144U (en) * | 2020-09-01 | 2021-04-16 | 湖北工建基础设施建设有限公司 | Hole cleaning device for pumping reverse circulation of cast-in-situ bored pile |
| CN112096323A (en) * | 2020-09-16 | 2020-12-18 | 湖北工建基础设施建设有限公司 | Construction system and method for slurry-free clear water pore-forming of cast-in-situ bored pile |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115142421A (en) * | 2022-08-09 | 2022-10-04 | 中国建筑第八工程局有限公司 | Guide row device for pouring cast-in-place pile and guide row method thereof |
| CN115142421B (en) * | 2022-08-09 | 2024-03-12 | 中国建筑第八工程局有限公司 | Guide and drainage device for pouring cast-in-place pile and guide and drainage method thereof |
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| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210723 |
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| RJ01 | Rejection of invention patent application after publication |