CN111305209A - Sinking method for super-long steel casing of large-diameter super-deep cast-in-place pile - Google Patents
Sinking method for super-long steel casing of large-diameter super-deep cast-in-place pile Download PDFInfo
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- CN111305209A CN111305209A CN202010117275.9A CN202010117275A CN111305209A CN 111305209 A CN111305209 A CN 111305209A CN 202010117275 A CN202010117275 A CN 202010117275A CN 111305209 A CN111305209 A CN 111305209A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
- E02D7/18—Placing by vibrating
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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
- E02D5/66—Mould-pipes or other moulds
- E02D5/665—Mould-pipes or other moulds for making piles
Abstract
The invention relates to the technical field of construction of building foundation engineering, in particular to a sinking method of an ultralong steel casing of a large-diameter ultradeep cast-in-place pile, which comprises the following steps: A. installing an outer layer steel casing; B. installing a middle-layer steel casing; C. installing an inner layer steel casing; D. and (5) measuring, checking and accepting, and finishing construction. The method solves the problem that the ultra-long steel casing with the length of about 60m is difficult to sink below the ground in the traditional construction.
Description
Technical Field
The invention relates to the technical field of construction of building foundation engineering, in particular to a sinking method of an ultralong steel casing of a large-diameter ultradeep cast-in-place pile.
Background
In the construction of the pile foundation of the offshore bridge artificial island, the depth of a cast-in-place pile is generally 45-105 m, and the depth of the slightly weathered rock is 1.5-4.5 m. Often can consider during the design that complicated marine geology easily leads to collapsing hole and artifical island overall displacement to the influence in stake hole, prevents the influence of ocean chloride to reinforced concrete erosion simultaneously, former construction process for the upper end install earlier interim 60m long steel and protect a section of thick bamboo and guarantee stake hole pore-forming, transfer 2.5mm thick bellows before the steel reinforcement cage installation after the pore-forming is accomplished to guarantee that concrete and ocean chloride stratum can effectively keep apart. Aiming at the original construction process, the process is various, and the pressure of the construction period is large; secondly, the friction force between the corrugated pipe and the soil layer is small, and the corrugated pipe cannot provide supporting force for the construction of hanging the large-weight reinforcement cage in subsequent construction; the corrugated pipe material has high processing cost and is not economical.
In order to solve the problems, the construction process is changed into a large-diameter permanent overlength steel pile casing to replace a temporary pile casing at the upper end and a permanent through long corrugated pipe in the subsequent construction, namely, the long retaining wall steel pile casing (about 60m) is sunk into a water-resisting layer, and the construction difficulty of a hole-forming retaining wall and a later heavy reinforcement cage with more than hundred tons is solved.
However, when a 60m deep ultra-long steel casing is sunk below the ground, when the casing is lowered to about 38m (wherein the sand layer is 15m), the casing is difficult to continue sinking due to the action of side friction resistance, and a local deformation phenomenon of the bottom end of the casing is caused. During general construction, a vibration hammer and a conventional pile casing material are adopted, the maximum limit of the steel pile casing is that the lateral frictional resistance of an upper stratum of about 38m can be overcome, and the scheme that the vibration hammer is adopted to directly vibrate the ultra-long steel pile casing in place at one time is difficult to realize. In conclusion, in the prior art, a steel casing which is about 60m long is difficult to sink into the ground under overcoming the frictional resistance of the side wall.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a method for sinking an ultra-long steel casing of a large-diameter ultra-deep cast-in-place pile, and solves the problem that the ultra-long steel casing of about 60m in the traditional construction is difficult to sink below the ground.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method for sinking an ultralong steel casing of a large-diameter ultradeep cast-in-place pile comprises the following steps:
A. installing an outer layer steel casing;
a1, measuring and lofting, and determining pile positions;
a2, through the cooperation of a crawler crane and a vibration hammer, vibrating and driving the pile into the outer-layer steel casing at the pile position which is well placed in the step A1, and then excavating the slag in the outer-layer steel casing by adopting a rotary drilling rig;
B. installing a middle-layer steel casing;
b1, measuring and determining the central point position of the middle steel casing;
b2, hoisting the middle-layer steel pile casing into the outer-layer steel pile casing through a crawler crane, enabling the lower end of the middle-layer steel pile casing to move downwards to the position below the outer-layer steel pile casing under the vibration action of a vibration hammer, finally digging out the residue soil in the middle-layer steel pile casing by adopting a rotary drilling rig, and welding a first fixing piece between the outer-layer steel pile casing and the middle-layer steel pile casing to fixedly connect the outer-layer steel pile casing and the middle-layer steel pile casing; the length of the middle-layer steel casing is 23-30m, and the length of the outer-layer steel casing is smaller than that of the middle-layer steel casing;
C. installing an inner layer steel casing;
c1, measuring and determining the central point position of the inner steel casing;
c2, hoisting the inner steel pile casing into the middle steel pile casing through a crawler crane, enabling the lower end of the inner steel pile casing to move downwards to a preset depth under the vibration action of a vibration hammer, and finally digging out the slag in the inner steel pile casing through a rotary drilling rig;
D. and (5) measuring, checking and accepting, and finishing construction.
Wherein, the following steps are also included between the steps A1 and A2:
and digging a shallow pit with the depth of 0.5-1.5 m at the position of the lofting pile position, and then hanging the outer-layer steel casing into the shallow pit.
Wherein, the following steps are also included between steps B1 and B2:
the inner side wall of the outer steel pile casing is provided with a plurality of first positioning blocks at intervals along the circumferential direction of the inner wall of the outer steel pile casing, and the center of each first positioning block is the center of the middle steel pile casing.
In the step B2, the middle-layer steel pile casing moves downwards until the upper end of the middle-layer steel pile casing is 25-35cm higher than the upper end of the outer-layer steel pile casing.
Wherein the length of the outer layer steel casing is 10-15 m.
Wherein, the following steps are also included between the steps C1 and C2:
and a plurality of second positioning blocks are arranged on the inner side wall of the middle-layer steel pile casing at intervals along the circumferential direction of the inner wall of the middle-layer steel pile casing, and the centers of the second positioning blocks are the centers of the inner-layer steel pile casings.
In the step C2, after the dregs in the inner steel casing are dug out, the method further comprises the following steps:
and a second fixing piece is welded between the middle-layer steel pile casing and the inner-layer steel pile casing to fixedly connect the middle-layer steel pile casing and the inner-layer steel pile casing.
In the step C2, when the inner steel pile casing moves downwards to the preset depth, the upper end of the inner steel pile casing is 25-35cm higher than the upper end of the middle steel pile casing.
The invention has the beneficial effects that:
1. the outer steel casing, the middle steel casing and the inner steel casing are sequentially embedded from outside to inside, the outer steel casing, the middle steel casing and the inner steel casing are sequentially arranged to be slightly short (10-15m), medium (23-30m) and ultra-long (about 60m), and friction resistance received by the middle steel casing is reduced through the outer steel casing, so that the middle steel casing can completely penetrate through a sand layer, the friction resistance received by the inner steel casing during sinking can be reduced through the middle steel casing, the inner steel casing can smoothly sink to the depth of 60m, namely the depth required by design is achieved, and the problem that the friction resistance of a side wall of the steel casing with the length of about 60m in the prior art is difficult to sink to the ground is solved.
2. According to the invention, the first fixing block and the second fixing block are respectively welded between the outer layer steel pile casing and the middle layer steel pile casing and between the middle layer steel pile casing and the inner layer steel pile casing, so that the stability and the bearing capacity of the inner layer steel pile casing are ensured, the inner layer steel pile casing cannot sink after the inner layer steel pile casing is installed with a steel reinforcement cage at a later stage, the steel reinforcement cage cannot deform after being hung on the steel reinforcement cage, and the pile body quality is improved.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a flow chart of the construction of an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an embodiment of the present invention.
Description of reference numerals: 1. an inner steel casing; 2. a middle steel casing; 3. an outer steel casing; 4. a first fixing member; 5. a second fixing member; 6. a first positioning block; 7. a second positioning block; 8. a crawler crane; 9. and (3) a hydraulic vibration hammer.
Detailed Description
The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention. In addition, all the connection/connection relations referred to in the patent do not mean that the components are directly connected, but mean that a better connection structure can be formed by adding or reducing connection auxiliary components according to specific implementation conditions. All technical characteristics in the invention can be interactively combined on the premise of not conflicting with each other.
A method for sinking an ultra-long steel casing of a large-diameter ultra-deep cast-in-place pile, as shown in fig. 1 and 2, comprises the following steps:
A. installing an outer layer steel casing 3;
a1, measuring and lofting, and determining pile positions;
digging a shallow pit with the depth of 1m at the position of the lofting pile position, and then hanging an outer layer steel casing 3 with the length of 12m and the diameter of 2800mm into the shallow pit, so as to reduce the influence on the original ground surface when a vibration hammer vibrates and avoid collapse of the original ground surface caused by overlarge vibration force;
a2, through the cooperation of the crawler crane 8 and a vibration hammer, vibrating and driving the pile position which is well placed in the step A1 into the outer layer steel casing 3 to enable the upper end of the outer layer steel casing 3 to be flush with the ground, then digging out the residue soil in the outer layer steel casing 3 by adopting a rotary drilling rig, and finally checking and accepting;
B. installing a middle-layer steel casing 2;
b1, measuring and determining the central point position of the middle steel casing 2;
because the length of the middle-layer steel casing 2 to be buried is long, in order to ensure the verticality of the middle-layer steel casing 2 when buried, the central point position of the middle-layer steel casing 2 is measured firstly, then four first positioning blocks 6 are welded on the inner side wall of the outer-layer steel casing 3 and along the circumferential direction of the inner wall of the outer-layer steel casing 3 at intervals, the center of each first positioning block 6 is the center of the middle-layer steel casing 2, the four first positioning blocks 6 are used for restraining the lower part of the middle-layer steel casing to be consistent with the hoisting point of the upper vibration hammer when the middle-layer steel casing sinks, and the accurate positioning of the verticality of the middle-layer steel casing under the two-.
B2, the middle-layer steel pile casing 2 is hung and placed in the outer-layer steel pile casing 3 through a crawler crane 8, then the lower end of the middle-layer steel pile casing 2 moves downwards to the position below the outer-layer steel pile casing 3 under the vibration action of a vibration hammer, finally, the slag soil in the middle-layer steel pile casing 2 is dug out through a rotary drilling rig, a first fixing piece 4 is welded between the outer-layer steel pile casing 3 and the middle-layer steel pile casing 2, the outer-layer steel pile casing 3 and the middle-layer steel pile casing 2 are fixedly connected, and particularly, the first fixing piece 4 is a steel corbel;
the length of the middle-layer steel casing 2 is 23-30m, the length of the outer-layer steel casing 3 is smaller than that of the middle-layer steel casing 2, specifically, in this embodiment, the length of the middle-layer steel casing 2 is 25m, the diameter of the middle-layer steel casing 2 is 2600mm, and the middle-layer steel casing 2 needs to penetrate through a 13m sand layer and a 12m sea mud layer; in order to facilitate the subsequent pulling out of the middle-layer steel pile casing 2, the middle-layer steel pile casing 2 moves downwards until the upper end of the middle-layer steel pile casing 2 is 30cm higher than the upper end of the outer-layer steel pile casing 3.
Wherein, because the length of middle level steel protects a section of thick bamboo 2 is longer, in this embodiment, middle level steel protects a section of thick bamboo 2 and is formed by two sections of pile casings connection, and concrete construction steps are as follows:
when burying middle level steel underground and protecting a section of thick bamboo 2, earlier first festival length is 15m, the diameter is 2600mm protects a section of thick bamboo and hangs and put into outer steel and protect a section of thick bamboo 3 in, then protect a plurality of support brackets of upper end welding of a section of thick bamboo at first festival, protect a section of thick bamboo with the second festival after that and protect a lower port of a section of thick bamboo and the butt joint of the last port of a section of thick bamboo with the first festival, protect a section of thick bamboo 2 with the first festival to protect the interface welded fastening who protects a section of thick bamboo and a section of thick bamboo with the second festival finally, rethread hoisting crawler crane 8 cooperation vibratory hammer operation makes middle level steel protect a section of thick bamboo 2 and is squeezed into outer steel and protect a.
C. Installing an inner layer steel casing 1;
c1, measuring and determining the position of the central point of the inner steel casing 1;
four second positioning blocks 7 are arranged on the inner side wall of the middle-layer steel casing 2 and along the inner wall of the middle-layer steel casing 2 at equal intervals in the circumferential direction, and the centers of the four second positioning blocks 7 are the centers of the inner-layer steel casing 1.
C2, hoisting the inner-layer steel pile casing 1 into the middle-layer steel pile casing 2 through the crawler crane 8, enabling the lower end of the inner-layer steel pile casing 1 to move downwards to a preset depth under the vibration action of the vibration hammer, and enabling the upper end of the inner-layer steel pile casing 1 to be higher than the upper end of the middle-layer steel pile casing 2 by 30cm when the inner-layer steel pile casing 1 moves downwards to the preset depth; finally, digging out the slag soil in the inner steel casing 1 by adopting a rotary drilling rig; in order to improve the stability and the bearing capacity of the inner-layer protective cylinder, a plurality of second fixing pieces 5 are welded between the inner-layer steel protective cylinder 1 and the middle-layer steel protective cylinder 2, so that the middle-layer steel protective cylinder 2 and the inner-layer steel protective cylinder 1 are fixedly connected, and the second fixing pieces 5 are steel corbels;
because the length of the inner steel casing 1 is long, in this embodiment, the inner steel casing 1 is formed by connecting a plurality of sections of casings, and the specific construction steps are as follows:
when the inner steel casing 1 is buried underground, a first section of casing is firstly hung in the middle steel casing 2, then a plurality of support brackets are welded at the upper end of the first section of casing, then the next section of casing is hung to the lower end of the first section of casing to be in butt joint with the upper end of the previous section of casing, finally the joints of two adjacent sections of casing are welded and fixed, and a plurality of sections of casings are sequentially connected according to the length of the inner steel casing 1 according to the steps until the total length of the connected casings reaches the preset length of the inner steel casing, and then the middle steel casing 2 is downwards driven into the lower part of the outer steel casing 3 through the operation of a hoisting crawler crane 8 in cooperation with a vibration hammer.
D. And (5) measuring, checking and accepting, and finishing construction.
According to the invention, an outer steel pile casing 3, a middle steel pile casing 2 and an inner steel pile casing 1 are sequentially embedded from outside to inside, the outer steel pile casing 3, the middle steel pile casing 2 and the inner steel pile casing 1 are sequentially arranged to be slightly short (10-15m), medium (23-30m) and ultra-long (about 60m), the friction resistance received by the middle steel pile casing 2 is reduced through the outer steel pile casing 3, so that the middle steel pile casing 2 can completely penetrate through a sand layer, the friction resistance received by the inner steel pile casing 1 during sinking can be reduced through the middle steel pile casing 2, the inner steel pile casing 1 can smoothly sink to the depth of 60m, namely the depth required by design is reached, and the problem that the friction resistance of the side wall of the steel pile casing which is about 60m in the prior art is difficult to sink to the ground is solved.
According to the invention, the first fixing block and the second fixing block are respectively welded between the outer layer steel pile casing 3 and the middle layer steel pile casing 2 and between the middle layer steel pile casing 2 and the inner layer steel pile casing 1, so that the stability and the bearing capacity of the inner layer steel pile casing 1 are ensured, the inner layer steel pile casing 1 cannot sink after the reinforcing cage is installed on the inner layer steel pile casing 1 at the later stage, the reinforcing cage cannot deform after being hung on the cage, and the pile body quality is improved. Specifically, first fixed block and second fixed block are high 15cm, and thickness is 2 cm's steel corbel piece, first fixed block and second fixed block all are provided with six, six first fixed block equidistance interval sets up, six second fixed block equidistance interval sets up.
Wherein, the length of outer steel protects a section of thick bamboo 3 is 12m, and the diameter is 2800mm, and it uses as protecting a section of thick bamboo temporarily, through burying outer steel protects a section of thick bamboo 3 underground earlier, makes outer steel protect a section of thick bamboo 3 and the contact of the fill soil and the sand layer on upper portion to reduce the frictional resistance of middle level steel protects a section of thick bamboo 2, and play guiding orientation's effect to the sinking of middle level steel protect a section of thick bamboo 2. Specifically, the deviation of the central point of the outer steel casing 3 when the outer steel casing 3 is embedded is not more than 10 cm.
The middle-layer steel pile casing 2 is used as a temporary pile casing, is in contact with a sand layer and a sea mud layer 13m below the outer-layer steel pile casing 3, completely penetrates through the sand layer, reduces side friction resistance for the sinking of the inner-layer steel pile casing 1 again, and plays a role in guiding and positioning for the sinking of the inner-layer steel pile casing 1.
When the third-layer pile casing is installed, a hole with the depth of 25m is formed in the hole, and in addition, the joint of the pile casings of the inner-layer steel pile casing 1 is easy to deviate or deform under the action of the gravity of the inner-layer steel pile casing 1, and the verticality is difficult to control, so that the direct connection position of the pile casings of the inner-layer steel pile casing 1 needs to be repeatedly corrected.
The inner steel casing 1 is an ultra-long casing, part of hard obstacles are occasionally distributed in the stratum of the lower part, the speed needs to be reduced when the steel casing is delivered downwards at the bottom of the deep layer, and deformation and distortion of the bottom of the inner steel casing 1 caused by strong impact force are avoided.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A method for sinking an ultralong steel casing of a large-diameter ultradeep cast-in-place pile is characterized by comprising the following steps: the method comprises the following steps:
A. installing an outer layer steel casing;
a1, measuring and lofting, and determining pile positions;
a2, through the cooperation of a crawler crane and a vibration hammer, vibrating and driving the pile into the outer-layer steel casing at the pile position which is well placed in the step A1, and then excavating the slag in the outer-layer steel casing by adopting a rotary drilling rig;
B. installing a middle-layer steel casing;
b1, measuring and determining the central point position of the middle steel casing;
b2, hoisting the middle-layer steel pile casing into the outer-layer steel pile casing through a crawler crane, enabling the lower end of the middle-layer steel pile casing to move downwards to the position below the outer-layer steel pile casing under the vibration action of a vibration hammer, finally digging out the residue soil in the middle-layer steel pile casing by adopting a rotary drilling rig, and welding a first fixing piece between the outer-layer steel pile casing and the middle-layer steel pile casing to fixedly connect the outer-layer steel pile casing and the middle-layer steel pile casing; the length of the middle-layer steel casing is 23-30m, and the length of the outer-layer steel casing is smaller than that of the middle-layer steel casing;
C. installing an inner layer steel casing;
c1, measuring and determining the central point position of the inner steel casing;
c2, hoisting the inner steel pile casing into the middle steel pile casing through a crawler crane, enabling the lower end of the inner steel pile casing to move downwards to a preset depth under the vibration action of a vibration hammer, and finally digging out the slag in the inner steel pile casing through a rotary drilling rig;
D. and (5) measuring, checking and accepting, and finishing construction.
2. The sinking method of the overlong steel casing of the large-diameter and overlong-depth cast-in-place pile according to claim 1, which is characterized in that: the method also comprises the following steps between the steps A1 and A2:
and digging a shallow pit with the depth of 0.5-1.5 m at the position of the lofting pile position, and then hanging the outer-layer steel casing into the shallow pit.
3. The sinking method of the overlong steel casing of the large-diameter and overlong-depth cast-in-place pile according to claim 1, which is characterized in that: the method also comprises the following steps between the steps B1 and B2:
the inner side wall of the outer steel pile casing is provided with a plurality of first positioning blocks at intervals along the circumferential direction of the inner wall of the outer steel pile casing, and the center of each first positioning block is the center of the middle steel pile casing.
4. The sinking method of the overlong steel casing of the large-diameter and overlong-depth cast-in-place pile according to claim 1, which is characterized in that: in the step B2, the middle-layer steel pile casing moves downwards until the upper end of the middle-layer steel pile casing is 25-35cm higher than the upper end of the outer-layer steel pile casing.
5. The sinking method of the overlong steel casing of the large-diameter and overlong-depth cast-in-place pile according to claim 1, which is characterized in that: the length of the outer layer steel casing is 10-15 m.
6. The sinking method of the overlong steel casing of the large-diameter and overlong-depth cast-in-place pile according to claim 1, which is characterized in that: the method also comprises the following steps between the steps C1 and C2:
and a plurality of second positioning blocks are arranged on the inner side wall of the middle-layer steel pile casing at intervals along the circumferential direction of the inner wall of the middle-layer steel pile casing, and the centers of the second positioning blocks are the centers of the inner-layer steel pile casings.
7. The sinking method of the overlong steel casing of the large-diameter and overlong-depth cast-in-place pile according to claim 1, which is characterized in that: in the step C2, after the dregs in the inner steel casing are dug out, the method also comprises the following steps:
and a second fixing piece is welded between the middle-layer steel pile casing and the inner-layer steel pile casing to fixedly connect the middle-layer steel pile casing and the inner-layer steel pile casing.
8. The sinking method of the overlong steel casing of the large-diameter and overlong-depth cast-in-place pile according to claim 1, which is characterized in that: in the step C2, when the inner steel pile casing moves downwards to the preset depth, the upper end of the inner steel pile casing is 25-35cm higher than the upper end of the middle steel pile casing.
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| CN202010117275.9A CN111305209A (en) | 2020-02-25 | 2020-02-25 | Sinking method for super-long steel casing of large-diameter super-deep cast-in-place pile |
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| CN202010117275.9A CN111305209A (en) | 2020-02-25 | 2020-02-25 | Sinking method for super-long steel casing of large-diameter super-deep cast-in-place pile |
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| CN102966096A (en) * | 2012-11-30 | 2013-03-13 | 天津第三市政公路工程有限公司 | Construction method for double pile casings of large-diameter cast-in-situ bored pile |
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| CN203846485U (en) * | 2014-05-28 | 2014-09-24 | 宏润建设集团股份有限公司 | Long pile percussion drill hole forming construction device |
| CN105275381A (en) * | 2014-05-28 | 2016-01-27 | 宏润建设集团股份有限公司 | Drilling construction method for water-rich cobble stratum by utilizing impact drill |
| CN108775036A (en) * | 2018-06-12 | 2018-11-09 | 深圳市工勘基础工程有限公司 | A kind of construction method for replacing bored concrete pile |
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2020
- 2020-02-25 CN CN202010117275.9A patent/CN111305209A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102966096A (en) * | 2012-11-30 | 2013-03-13 | 天津第三市政公路工程有限公司 | Construction method for double pile casings of large-diameter cast-in-situ bored pile |
| CN103195058A (en) * | 2013-04-03 | 2013-07-10 | 四川川交路桥有限责任公司 | Multi-casing structure capable of facilitating bridge-pile construction in cavern development areas and construction method thereof |
| CN203846485U (en) * | 2014-05-28 | 2014-09-24 | 宏润建设集团股份有限公司 | Long pile percussion drill hole forming construction device |
| CN105275381A (en) * | 2014-05-28 | 2016-01-27 | 宏润建设集团股份有限公司 | Drilling construction method for water-rich cobble stratum by utilizing impact drill |
| CN108775036A (en) * | 2018-06-12 | 2018-11-09 | 深圳市工勘基础工程有限公司 | A kind of construction method for replacing bored concrete pile |
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Application publication date: 20200619 |