CN112482357A - Drilling tool for pre-blasting cement mixing pile suitable for hard soil layer and application method thereof - Google Patents
Drilling tool for pre-blasting cement mixing pile suitable for hard soil layer and application method thereof Download PDFInfo
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- CN112482357A CN112482357A CN202011412151.XA CN202011412151A CN112482357A CN 112482357 A CN112482357 A CN 112482357A CN 202011412151 A CN202011412151 A CN 202011412151A CN 112482357 A CN112482357 A CN 112482357A
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- 239000002689 soil Substances 0.000 title claims abstract description 69
- 239000004568 cement Substances 0.000 title claims abstract description 61
- 238000005553 drilling Methods 0.000 title claims abstract description 37
- 238000005422 blasting Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 56
- 238000003756 stirring Methods 0.000 claims abstract description 40
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 39
- 239000010959 steel Substances 0.000 claims abstract description 39
- 239000002360 explosive Substances 0.000 claims abstract description 37
- 229910052742 iron Inorganic materials 0.000 claims abstract description 28
- 238000004880 explosion Methods 0.000 claims abstract description 7
- 238000010276 construction Methods 0.000 claims description 39
- 239000002002 slurry Substances 0.000 claims description 22
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims description 9
- 238000005507 spraying Methods 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 4
- 239000011435 rock Substances 0.000 abstract description 7
- 230000008602 contraction Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000003487 anti-permeability effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
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- 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
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
- E02D3/126—Consolidating by placing solidifying or pore-filling substances in the soil and mixing by rotating blades
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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
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/62—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/22—Rods or pipes with helical structure
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- Structural Engineering (AREA)
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- Environmental & Geological Engineering (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Soil Sciences (AREA)
- Agronomy & Crop Science (AREA)
- Piles And Underground Anchors (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a drilling tool for a pre-blasting cement mixing pile suitable for a hard soil layer and an application method thereof. The valve type screw drill consists of four helical blades which can be opened and closed. The movable plate can control the opening and closing of the movable plate and the valve type threaded drill bit through the contraction and release of the steel wire rope. The explosive is pre-buried between the movable plate and the iron block. The invention adopts the explosive to explode and crush after lifting the drill to the safe distance when encountering hard soil layers such as weathered rock pebble layers and the like or boulders, and puts down the cement stirring drill rod after explosion to continue guniting and stirring to form the cement stirring pile.
Description
Technical Field
The invention relates to the field of foundation pit enclosure and foundation treatment, in particular to a drilling tool for a pre-explosion cement mixing pile suitable for a hard soil layer and an application method thereof, and is suitable for cement mixing pile construction of hard soil layers such as pebble layers, weathered rock layers and the like.
Background
The stirring pile has the advantages of high construction speed, low construction cost, good pile forming quality and uniformity, strong integrity and continuity, good water stopping effect, easy guarantee of verticality and good construction effect in soft soil, silt and cohesive soil with high water content. However, construction often encounters hard soil layers such as deep buried and thick pebble layers, weathered rock layers and the like, and the stirring pile is difficult to drill and stir in the hard soil layers and difficult to form a pile or has poor pile forming quality and the like.
Chinese patent CN104420462 discloses a super cement mixing pile device, which increases the drill tooth spacing and drill rod blade spacing and increases the mixing head power to realize the pebble bed drilling, but in fact, for a denser pebble bed or meeting an isolated stone, the drilling is still difficult, and even the drill rod is damaged by excessive torque. Chinese patent CN102979095 discloses a construction method of a cement-soil mixing pile in a super-hard soil layer, which comprises the steps of firstly conducting hole leading construction on the hard soil layer such as weathered rocks or pebble layers and then conducting mixing construction, wherein hole leading drilling is adopted in the method to lead holes firstly, so that working procedures are increased, construction efficiency is low, and cost is increased.
From the above, it can be known that improvement of cement mixing pile construction equipment and construction method for hard soil layers such as pebble layers, weathered rock layers and the like is necessary, and the problems of difficulty in drilling in the hard soil layers and construction efficiency are solved, so that the benefit of engineering is maximized.
Disclosure of Invention
In order to solve the problems in a targeted manner, the invention provides a drilling tool for a pre-blasting cement mixing pile suitable for a hard soil layer and an application method thereof. The method aims to pre-burst the hard soil layer and then carry out cement stirring construction, thereby solving the problems of difficult construction of the hard soil layer and poor pile forming quality.
The purpose of the invention is realized by the following technical scheme: a pre-explosion cement mixing pile drilling tool suitable for a hard soil layer comprises a hollow drill rod, drill pipe blades, a soft steel ruler, a cylindrical iron block, explosive, a movable plate hinge, a valve type threaded drill bit, a steel wire rope and a steel wire rope hinge;
the drill rod is symmetrically provided with a plurality of rows of drill pipe blades, a cylindrical iron block is arranged inside the hollow drill rod, and the upper end part of the cylindrical iron block is connected with the mild steel ruler. The movable petal type threaded drill consists of four helical blades which can be opened and closed;
the movable plate consists of four quarter circular plates, and each quarter circular plate of the movable plate corresponds to and is fixed with each spiral blade of the valve-shaped threaded drill bit and then is connected with the bottom end of the drill pipe through a movable hinge. Each quarter circular plate of the movable plate is connected with a steel wire rope through a steel wire rope hinge, and the movable plate and the valve type threaded drill bit are controlled to be opened and closed through shrinkage and relaxation of the steel wire ropes. The explosive is placed between the movable plate and the iron block in advance.
Further, the diameter of the cylindrical iron block is matched with the inner diameter of the hollow drill rod.
Furthermore, the helical blade of the valve type thread drill bit is opened or closed along with the movable plate, and when the helical blade is in a closed state, the hollow drill rod is in a pointed thread shape.
Furthermore, the movable plate is controlled to be closed through tensioning of the steel wire rope, and the movable plate is controlled to be opened through loosening of the steel wire rope.
Further, the safety distance between the explosive placing position and the hollow drill rod is judged by reading the reading on the mild steel ruler.
The invention also provides an application method of the drilling tool for pre-blasting the cement mixing pile, which is suitable for the hard soil layer, and comprises the following steps:
1) leveling and measuring the field and paying off: before the machine enters the field, sundries are removed from the construction area in advance and the field is leveled. And (4) according to the coordinate reference points, releasing pile positions according to the design drawing.
2) Excavating a guide groove: and digging a working groove along the direction parallel to the center line of the enclosure by using an excavator, wherein the width of the groove is determined according to the width of the enclosure structure.
3) The pile driver is in place: and an operator strictly controls the movement of the pile frame of the drilling machine according to the determined position, so that the position of the axis of the drilling hole is ensured not to be deviated.
4) Preparing cement slurry and injecting the slurry: a cement paste stirring system (automatic stirring station) is arranged on a construction site, a cement tank is arranged nearby, and cement paste is stirred according to requirements before starting. And (4) feeding the prepared cement slurry into a slurry storage barrel for later use.
5) Stirring the soft soil layer: stirring and spraying slurry on the soft soil layer in a state that the helical blades on the valve type threaded drill bit are folded.
6) Pre-blasting a hard soil layer: when the drilling tool meets a hard soil layer and is difficult to normally stir and drill, the hollow drill rod is firstly lifted to a certain height, the movable plate is controlled to be opened through loosening of the steel wire rope, so that the spiral blades on the movable-petal-shaped thread drill bit are driven to be opened, then the explosive falls onto the hard soil layer under the action of gravity, the depth of the explosive is estimated through reading of the soft steel ruler connected to the upper end of the iron block, the hollow drill rod and the iron block are lifted and adjusted to a safe position, the explosive is detonated, and the hard soil layer is blasted and.
7) And (3) completing the construction of the cement mixing pile: after the hard soil layer is pre-blasted, the movable plate is controlled to be closed through tightening of the steel wire rope, so that the helical blades on the flap type threaded drill bit are driven to be folded, stirring and guniting are continued, and finally, the cement stirring pile is formed on the hard soil layer.
The invention has the following characteristics and beneficial effects:
1. the hollow drill rod is internally provided with the explosive, so that the explosive can be utilized for pre-explosion when encountering a hard soil layer or boulder, the hard soil layer is crushed, and the stirring drilling difficulty is reduced.
2. According to the invention, the helical blade at the bottom of the hollow drill rod can be folded when the explosive is not used, so that the explosive is prevented from falling out and soil is prevented from extruding into the hollow drill rod, and when the explosive is used, the movable plate can be opened by loosening the steel wire rope, so that the valve type threaded drill bit is driven to open.
3. The invention adopts explosive explosion pre-crushing, and pre-crushes the hard soil layer before normal stirring, thereby solving the problem of difficult stirring and drilling of the hard soil layer and improving the construction efficiency and the construction quality.
4. The invention avoids the hard soil layer hole leading construction process, can complete construction by adopting one pile machine for continuous construction, and has high construction efficiency and short construction period.
5. The invention improves the pile forming quality of the stirring pile in the hard soil layer, improves the anti-permeability performance of the cement stirring pile waterproof curtain in the hard soil layer, has good waterproof effect, can be used for the construction of various foundation pit engineering waterproof curtains and has wide application range.
6. The invention has simple construction, safety and reliability. According to the invention, the deep blasting is adopted to explode and crush the hard soil layer in advance to loosen the hard soil layer, so that the drill rod can be lowered for normal construction of the cement mixing pile, the construction is simple and convenient, the risks of drill jamming and drill dropping are reduced, and the construction is safe and reliable.
Drawings
FIG. 1 is a schematic view of a cement mixing pile drilling tool with a flapper type thread drill bit in an open state;
FIG. 2 is a schematic view of a drilling tool for a cement mixing pile in a closed state of a valve type threaded drill;
FIG. 3 is a view showing the opened state of the blades of the valve type screw drill of the cement mixing pile drilling tool;
FIG. 4 is a view showing a state where blades of a flap-type screw drill of a cement mixing pile drilling tool are closed;
in the figure, 1, a hollow drill rod; 2. drill pipe blades; 3. a grouting pipe; 4. a mild steel rule; 5. an iron block; 6. an explosive; 7. a movable plate; 8. a movable plate hinge; 9. a flapper-type thread drill; 10. a wire rope; 11. a wire rope hinge.
Detailed Description
In order to make the technical means, the original characteristics, the achieved purposes and the effects of the invention easy to understand, the invention is further described with reference to the figures and the specific embodiments.
The invention is used for a waterproof curtain of a cement mixing pile, and is generally used for projects containing pebble beds or weathered rock beds within the range of the pile length.
As shown in fig. 1-4, the invention provides a pre-blasting cement mixing pile drilling tool suitable for a hard soil layer, which comprises a hollow drill rod 1, a drill pipe blade 2, a soft steel ruler 4, a cylindrical iron block 5, an explosive 6, a movable plate 7, a movable plate hinge 8, a valve type thread drill bit 9, a steel wire rope 10 and a steel wire rope hinge 11;
the hollow drill rod 1 is symmetrically provided with a plurality of rows of drill pipe blades 2, a grouting pipe 3 is arranged inside the hollow drill rod 1 and used for injecting cement slurry, a cylindrical iron block 5 is arranged below the inside of the hollow drill rod, the diameter of the cylindrical iron block 5 is matched with the inner diameter of the hollow drill rod 1 and used for fixing explosive 6, and the upper end part of the cylindrical iron block 5 is connected with a mild steel ruler 4. The valve type thread drill bit 9 consists of four helical blades which can be opened and closed;
the movable plate 7 is composed of four quarter circular plates, each quarter circular plate of the movable plate 7 corresponds to each spiral blade of the valve-shaped threaded drill bit 9 in position and is welded and fixed together, and then the movable plate 7 is connected with the bottom end of the drill pipe through a movable hinge 8, so that the valve-shaped threaded drill bit 9 is opened when the movable plate 7 is opened, and the valve-shaped threaded drill bit 9 is closed when the movable plate 7 is closed. Each quarter circular plate of the movable plate 7 is connected with a steel wire rope 10 through a steel wire rope hinge 11, the movable plate 7 and the valve type thread drill bit 9 are controlled to be closed through tensioning of the steel wire rope 10, and the movable plate 7 and the valve type thread drill bit 9 are controlled to be opened through loosening of the steel wire rope 10. Explosive 6 is placed between the movable plate 7 and the iron block in advance. And the safe distance between the placement position of the explosive 6 and the hollow drill rod 1 is judged by reading the reading on the mild steel rule 4.
The helical blade of the valve type thread drill bit 9 is opened or closed along with the opening or closing of the movable plate 7, and when the helical blade is in a closed state, the hollow drill rod 1 is in a pointed thread shape. At the moment, the explosive 6 is positioned on the movable plate 7, and the upper edge of the explosive 6 is fixed by the cylindrical iron block 5. When the steel wire rope 10 is in a loosening state, the movable plate 7 is opened along with the steel wire rope and drives the valve type threaded drill bit 9 to be opened, the explosive 6 and the iron block 5 fall on a hard soil layer under the action of gravity, the soft steel ruler 4 is tensioned, and the reading of the soft steel ruler 4 is read to judge the depth of the explosive 6, so that the hollow drill rod 1 and the iron block 5 are lifted to a safe distance.
The invention also provides an application method of the drilling tool for pre-blasting the cement mixing pile, which is suitable for the hard soil layer, and comprises the following steps:
1) leveling and measuring the field and paying off: before the machine enters the field, sundries are removed from the construction area in advance and the field is leveled. And (4) according to the coordinate reference points, releasing pile positions according to the design drawing.
2) Excavating a guide groove: and digging a working groove along the direction parallel to the center line of the enclosure by using an excavator, wherein the width of the groove is determined according to the width of the enclosure structure.
3) The pile driver is in place: and an operator strictly controls the movement of the pile frame of the drilling machine according to the determined position, so that the position of the axis of the drilling hole is ensured not to be deviated.
4) Preparing cement slurry and injecting the slurry: a cement paste stirring system (automatic stirring station) is arranged on a construction site, a cement tank is arranged nearby, and cement paste is stirred according to requirements before starting. And (4) feeding the prepared cement slurry into a slurry storage barrel for later use.
5) Stirring the soft soil layer: stirring and spraying slurry on the soft soil layer in a state that the helical blades on the valve type threaded drill bit 9 are folded.
6) Pre-blasting a hard soil layer: when encountering hard soil layer and being difficult to normally stir and drill, firstly lifting the hollow drill rod 1 to a certain height, controlling the movable plate 7 to open through the loosening of the steel wire rope 10, thereby driving the helical blade on the flap type thread drill bit 9 to open, then dropping the explosive 6 on the hard soil layer under the action of gravity, estimating the depth of the explosive 6 through the reading of the soft steel ruler 4 connected with the upper end of the iron block 5, then lifting and adjusting the hollow drill rod 1 and the iron block 5 to a safe position, detonating the explosive 6, and blasting to loosen the hard soil layer.
7) And (3) completing the construction of the cement mixing pile: after the hard soil layer is pre-blasted, the movable plate is controlled to be closed by tightening the steel wire rope 10, so that the helical blades on the flap-type threaded drill bit 9 are driven to be folded, stirring and guniting are continued, and finally, the cement stirring pile is formed on the hard soil layer.
Example (b):
a cement mixing pile waterproof curtain with the diameter of 800mm in a certain foundation pit enclosure project is constructed, and a stratum within the pile length range contains a compact pebble layer.
The diameter of a hollow drill rod 1 is 400mm, and the length of a drill pipe blade 2 of the hollow drill pipe is 200 mm. The wall thickness of the hollow drill rod 1 is 200mm, 2kg of explosive is embedded in the bottom of the hollow drill rod 1 in advance, and the diameter of the cylindrical iron block is 190 mm. The radius of the movable plate 7 at the bottom of the hollow drill rod 1 is matched with that of the hollow drill rod 1. The construction was carried out according to the following procedure.
1) Leveling and measuring the field and paying off: and (5) clearing and leveling the construction area of the mixing pile before mechanical entry to achieve solid and level foundation. And (4) according to the coordinate reference point, releasing the pile position according to a design drawing, and setting a temporary control pile.
2) Excavating a guide groove: digging a working groove along the direction parallel to the center line of the enclosure by using an excavator, wherein the width of the groove is 0.8-1.2 m.
3) The pile driver is in place: and an operator strictly controls the movement of the pile frame of the drilling machine according to the determined position, so that the position of the axis of the drilling hole is ensured not to be deviated.
4) Preparing cement slurry and injecting the slurry: a cement paste stirring system (automatic stirring station) is arranged on a construction site, a cement tank is arranged nearby, and cement paste is stirred according to requirements before starting. And (4) feeding the prepared cement slurry into a slurry storage barrel for later use.
5) General soil layer stirring: stirring and spraying slurry on a common soil layer in a state that the helical blades on the valve type thread drill bit 9 are folded. The stirring range of the drill pipe blade is 800mm, the water cement ratio of the cement paste of the general soil layer is 1.5, and the cement is sprayed according to the cement mixing amount of 20 percent. The movable plate 7 is in a closed state in the construction process of a common soil layer, so that the soil is prevented from being extruded into the hollow drill rod 1 and the explosive 6 from falling.
6) Impacting and crushing a hard soil layer: when hard soil layers or boulders such as pebble layers, weathered rocks and the like are encountered and normal stirring drilling is difficult, the hollow drill rod 1 is firstly lifted to a certain height, the lifting height needs to be greater than the length of the valve type thread drill bit 9, a certain space is reserved for the opening of the movable plate 7 and the valve type thread drill bit 9, and the explosive 6 and the iron block 5 freely fall to the hard soil layers by loosening the steel wire rope 10. And (4) tensioning the mild steel rule 4, reading the reading of the mild steel rule 4, judging the depth of the explosive, and then adjusting the depth of the hollow drill rod 1 according to the depth to enable the distance to be larger than the safety distance. And then detonating the explosive to pre-blast the hard soil layer, after the pre-blasting is finished, pulling the steel wire rope 10, closing the movable plate 7 to fold the valve type threaded drill bit 9, and then continuously stirring and spraying the slurry under the state that the blades of the valve type threaded drill bit 9 are folded.
The above-described embodiments are intended to illustrate rather than to limit the invention, and any modifications and variations of the present invention are within the spirit of the invention and the scope of the appended claims.
Claims (6)
1. The utility model provides a pre-explosion cement mixing pile drilling tool suitable for hard soil layer which characterized in that: the cement mixing pile drilling tool comprises a hollow drill rod (1), drill pipe blades (2), a flexible steel rule (4), a cylindrical iron block (5), explosive (6), a movable plate (7), a movable plate hinge (8), a valve type threaded drill bit (9), a steel wire rope (10) and a steel wire rope hinge (11);
the drill rod is characterized in that a plurality of rows of drill pipe blades (2) are symmetrically arranged on the hollow drill rod (1), a cylindrical iron block (5) is arranged inside the hollow drill rod (1), and the upper end part of the cylindrical iron block (5) is connected with the mild steel ruler (4). The movable valve type thread drill bit (9) consists of four helical blades which can be opened and closed;
the movable plate (7) consists of four quarter circular plates, and each quarter circular plate of the movable plate (7) corresponds to and is fixed with each spiral blade of the valve-shaped threaded drill bit (9) and then is connected with the bottom end of the drill pipe through a movable hinge (8). Each quarter circular plate of the movable plate (7) is connected with a steel wire rope (10) through a steel wire rope hinge (11), and the movable plate (7) and the valve type threaded drill bit (9) are controlled to be opened and closed through shrinkage release of the steel wire rope (10). Explosive (6) is placed between the movable plate (7) and the iron block in advance.
2. The drilling tool for pre-blasting cement mixing piles suitable for hard soil layers according to claim 1, characterized in that: the diameter of the cylindrical iron block (5) is matched with the inner diameter of the hollow drill rod (1).
3. The drilling tool for pre-blasting cement mixing piles suitable for hard soil layers according to claim 1, characterized in that: the helical blade of the valve type thread drill bit (9) is opened or closed along with the movable plate (7), and when the helical blade is in a closed state, the hollow drill rod (1) is in a pointed thread shape.
4. The drilling tool for pre-blasting cement mixing piles suitable for hard soil layers according to claim 1, characterized in that: the movable plate (7) is controlled to be closed by tensioning the steel wire rope (10), and the movable plate (7) is controlled to be opened by loosening the steel wire rope (10).
5. The drilling tool for pre-blasting cement mixing piles suitable for hard soil layers according to claim 1, characterized in that: the safety distance between the placement position of the explosive (6) and the hollow drill rod (1) is judged by reading the reading on the mild steel ruler (4).
6. The application method of the pre-explosion cement mixing pile drilling tool suitable for the hard soil layer is characterized by comprising the following steps of:
1) leveling and measuring the field and paying off: before the machine enters the field, sundries are removed from the construction area in advance and the field is leveled. And (4) according to the coordinate reference points, releasing pile positions according to the design drawing.
2) Excavating a guide groove: and digging a working groove along the direction parallel to the center line of the enclosure by using an excavator, wherein the width of the groove is determined according to the width of the enclosure structure.
3) The pile driver is in place: and an operator strictly controls the movement of the pile frame of the drilling machine according to the determined position, so that the position of the axis of the drilling hole is ensured not to be deviated.
4) Preparing cement slurry and injecting the slurry: a cement paste stirring system (automatic stirring station) is arranged on a construction site, a cement tank is arranged nearby, and cement paste is stirred according to requirements before starting. And (4) feeding the prepared cement slurry into a slurry storage barrel for later use.
5) Stirring the soft soil layer: stirring and spraying slurry on the soft soil layer in a state that the helical blades on the valve type threaded drill bit (9) are folded.
6) Pre-blasting a hard soil layer: run into the hardpan, when being difficult to normally stir and drilling, at first promote hollow drill rod (1) to take the altitude, loosen through wire rope (10) and control fly leaf (7) and open, thereby drive helical blade on flap type thread drill bit (9) and open, then on explosive (6) fall the hardpan under the action of gravity, soft steel rule (4) reading through iron plate (5) upper end connection estimated the degree of depth of explosive (6), promote adjustment hollow drill rod (1) and iron plate (5) to the safe position again, detonate explosive (6), the hard pan that the blasting is become flexible.
7) And (3) completing the construction of the cement mixing pile: after the hard soil layer is pre-blasted, the movable plate is controlled to be closed through tightening of the steel wire rope (10), so that the spiral blades on the flap-type thread drill bit (9) are driven to be folded, stirring and guniting are continued, and finally the cement stirring pile is formed on the hard soil layer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011412151.XA CN112482357B (en) | 2020-12-04 | 2020-12-04 | Drilling tool for pre-blasting cement mixing pile suitable for hard soil layer and application method thereof |
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| CN202011412151.XA CN112482357B (en) | 2020-12-04 | 2020-12-04 | Drilling tool for pre-blasting cement mixing pile suitable for hard soil layer and application method thereof |
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| CN115341529A (en) * | 2022-09-19 | 2022-11-15 | 中国路桥工程有限责任公司 | Cement stirring grouting reinforcement treatment method and device for deep soft soil foundation |
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| CN115341529A (en) * | 2022-09-19 | 2022-11-15 | 中国路桥工程有限责任公司 | Cement stirring grouting reinforcement treatment method and device for deep soft soil foundation |
| CN115341529B (en) * | 2022-09-19 | 2023-09-01 | 中国路桥工程有限责任公司 | Cement stirring grouting reinforcement treatment method and device for deep soft soil foundation |
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