CN111188339A - Ultra-long steel pile casing sinking system of large-diameter ultra-deep cast-in-place pile - Google Patents
Ultra-long steel pile casing sinking system of large-diameter ultra-deep cast-in-place pile Download PDFInfo
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Abstract
The invention relates to the technical field of building foundation engineering, in particular to an ultra-long steel pile casing sinking system of a large-diameter ultra-deep cast-in-place pile, which comprises a hydraulic vibration hammer, a crawler crane and a rotary drilling rig, it also comprises an inner steel protective cylinder, a middle steel protective cylinder sleeved outside the inner steel protective cylinder, an outer steel protective cylinder sleeved outside the middle steel protective cylinder, a first fixing piece arranged between the outer steel protective cylinder and the middle steel protective cylinder, and a second fixing piece arranged between the middle steel protective cylinder and the outer steel protective cylinder, the inner layer steel pile casing, the middle layer steel pile casing and the outer layer steel pile casing are coaxially arranged, the length of the middle layer steel pile casing is 23-30m, the length of the outer layer steel casing is greater than that of the middle layer steel casing, the length of the outer layer steel casing is less than that of the middle layer steel casing, the first fixing piece is used for fixing the outer layer steel pile casing and the middle layer steel pile casing, and the second fixing piece is used for fixing the middle layer steel pile casing and the inner layer steel pile casing. The invention makes the ultra-long steel casing sink into the ground surface by overcoming the side friction resistance.
Description
Technical Field
The invention relates to the technical field of building foundation engineering, in particular to an ultra-long steel pile casing sinking system of a large-diameter ultra-deep 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, the casing is difficult to continue sinking due to the side friction resistance when the casing is lowered to about 38m (wherein the sand layer is 15m), and a phenomenon of local deformation of the bottom end of the casing is caused. During general construction, a hydraulic vibration hammer and a conventional casing material are adopted, the maximum limit of the steel casing can overcome the side friction resistance of the upper stratum of about 38m, and the scheme of directly vibrating and conveying the ultra-long steel casing in place at one time by adopting the hydraulic vibration hammer is difficult to realize. In summary, the steel casing with the length of about 60m in the prior art is difficult to overcome the frictional resistance of the side wall and sink into the ground.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an ultra-long steel casing sinking system of a large-diameter ultra-deep cast-in-place pile, which solves the problem that a steel casing with the length of about 60m is difficult to overcome the side friction resistance and sink below the ground in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the ultra-long steel pile casing sinking system for the large-diameter ultra-deep cast-in-place pile comprises a hydraulic vibration hammer, a crawler crane and a rotary drilling rig, and further comprises an inner steel pile casing, a middle steel pile casing sleeved outside the inner steel pile casing, an outer steel pile casing sleeved outside the middle steel pile casing, a first fixing piece arranged between the outer steel pile casing and the middle steel pile casing, and a second fixing piece arranged between the middle steel pile casing and the outer steel pile casing, wherein the inner steel pile casing, the middle steel pile casing and the outer steel pile casing are coaxially arranged, the length of the middle steel pile casing is 23-30m, the length of the outer steel pile casing is larger than that of the middle steel pile casing, the length of the outer steel pile casing is smaller than that of the middle steel pile casing, the first fixing piece is used for fixing the outer steel pile casing and the middle steel pile casing, and the second fixing piece is used for fixing the middle steel pile casing and the inner steel pile casing.
Further, the length of the outer layer steel casing is 10-15m, and the length of the inner layer steel casing is 58-65 m.
Further, the diameter of the inner layer steel casing is 2350-2450 mm, the diameter of the middle layer steel casing is 2550-2650 mm, and the diameter of the outer layer steel casing is 2750-2850 mm.
Furthermore, a plurality of first locating blocks are arranged on the inner side wall of the outer-layer steel casing at intervals in the circumferential direction, and the distance from the side face, far away from the inner wall of the outer-layer steel casing, of each first locating block to the center of the outer-layer steel casing is equal.
Furthermore, a plurality of second positioning blocks are arranged on the inner side wall of the middle-layer steel casing at intervals in the circumferential direction, and the distance from the side face, far away from the inner wall of the inner-layer steel casing, of each second positioning block to the center of the middle-layer steel casing is equal.
Further, the top of the middle layer steel casing is 25-35cm higher than that of the outer layer steel casing.
Further, the top of the inner layer steel casing is 25-35cm higher than that of the middle layer steel casing.
The invention has the beneficial effects that:
the outer steel casing, the middle steel casing and the inner steel casing are sequentially sleeved from outside to inside, the outer steel casing plays a role in positioning and guiding the sinking of the middle steel casing, the side friction resistance of the middle steel casing during sinking is reduced, the abrasion of the middle steel casing is reduced, and the service life of the middle steel casing is prolonged.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a flow chart of the construction of the 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.
An ultra-long steel pile casing sinking system of a large-diameter ultra-deep cast-in-place pile comprises a hydraulic vibration hammer 9 (not shown in the figure), a crawler crane 8 (not shown in the figure) and a rotary drilling rig (not shown in the figure) as shown in figure 1, and further comprises an inner steel pile casing 1, a middle steel pile casing 2 sleeved outside the inner steel pile casing 1, an outer steel pile casing 3 sleeved outside the middle steel pile casing 2, a first fixing part 4 arranged between the outer steel pile casing 3 and the middle steel pile casing 2, and a second fixing part 5 arranged between the middle steel pile casing 2 and the outer steel pile casing 3, wherein the inner steel pile casing 1, the middle steel pile casing 2 and the outer steel pile casing 3 are coaxially arranged, the length of the middle steel pile casing 2 is 23-30m, the length of the outer steel pile casing 3 is greater than that of the middle steel pile casing 2, and the length of the outer steel pile casing 3 is less than that of the middle steel pile casing 2, the first fixing piece 4 is used for fixing the outer layer steel pile casing 3 and the middle layer steel pile casing 2, and the second fixing piece 5 is used for fixing the middle layer steel pile casing 2 and the inner layer steel pile casing 1.
When the system is used, the hydraulic vibration hammer 9 is installed at the top of the outer-layer steel casing 3 through a clamp of the hydraulic vibration hammer 9, then the outer-layer steel casing 3 is hung to a preset pile position through the crawler crane 8, and then the outer-layer steel casing 3 is vibrated and driven into the underground preset depth through the cooperation of the crawler crane 8 and the hydraulic vibration hammer 9, and then the slag soil in the outer-layer steel casing 3 is dug out through a rotary drilling rig; then installing a hydraulic vibration hammer 9 on the top of the middle steel casing 2, then hanging the middle steel casing 2 into the outer steel casing 3 by a crawler crane 8, vibrating the outer steel casing 3 into the underground preset depth by the cooperation of the crawler crane 8 and the hydraulic vibration hammer 9, digging out the muck in the middle steel casing 2 by a rotary drilling rig, then welding a first fixing piece 4 between the outer steel casing 3 and the middle steel casing 2 to fixedly connect the outer steel casing 3 and the middle steel casing 2, finally installing the hydraulic vibration hammer 9 on the top of the inner steel casing 1, then hanging the inner steel casing 1 into the middle steel casing 2 by the crawler crane 8, vibrating the inner steel casing 1 into the underground preset depth by the cooperation of the crawler crane 8 and the hydraulic vibration hammer 9, welding a second fixing piece 5 between the middle steel casing 2 and the inner steel casing 1, the inner layer steel casing 1 and the middle layer steel casing 2 are fixedly connected.
According to the invention, the outer steel pile casing 3, the middle steel pile casing 2 and the inner steel pile casing 1 are sequentially sleeved from outside to inside, the outer steel pile casing 3 plays a role in positioning and guiding the sinking of the middle steel pile casing 2, the side friction resistance borne by the middle steel pile casing 2 during sinking is reduced, the abrasion of the middle steel pile casing 2 is reduced, and the service life of the middle steel pile casing is prolonged.
Because the maximum limit of the steel casing can overcome the side friction resistance of the upper stratum of about 38m, when the side friction resistance is too large, the steel casing may deform, so in order to protect the outer layer steel casing 3, the middle layer steel casing 2 and the inner layer steel casing 1, so that the steel casing is not easy to deform in use, the length of the outer layer steel casing 3 is 10-15m, the length of the inner layer steel casing 1 is 58-65m, specifically, in the embodiment, the length of the outer layer steel casing 3 is 12m, the length of the middle layer steel casing 2 is 25m, and the length of the inner layer steel casing 1 is 60 m.
Further, in order to ensure that the middle layer steel pile casing 2 can be smoothly hung into the outer layer steel pile casing 3, the inner layer steel pile casing 1 can be smoothly hung into the middle layer steel pile casing 2, the diameter of the inner layer steel pile casing 1 is 2350mm-2450mm, the diameter of the middle layer steel pile casing 2 is 2550mm-2650mm, and the diameter of the outer layer steel pile casing 3 is 2750mm-2850 mm. When the diameter of the outer layer steel casing 3 is too large, the side friction resistance which needs to be overcome by the outer layer steel casing 3 is larger, and the abrasion is larger.
Specifically, in this embodiment, the diameter of the outer steel casing 3 is 2800mm, the diameter of the middle steel casing 2 is 2600mm, and the diameter of the inner steel casing 1 is 2400 mm.
Further, because the length of the middle steel casing 2 is large, in order to ensure the verticality of the middle steel casing 2 during installation, four first positioning blocks 6 are circumferentially arranged on the inner side wall of the outer steel casing 3 at equal intervals, and the distance from the side surface of each first positioning block 6 far away from the inner wall of the outer steel casing 3 to the center of the outer steel casing 3 is equal. The four first positioning blocks 6 are used for restraining the middle-layer steel pile casing 2 to keep consistent with a lifting point of the upper hydraulic vibration hammer 9 when sinking, so that the verticality of the middle-layer steel pile casing 2 is accurately positioned by two-point one-line control, the cast-in-place pile meets the construction requirement, and the quality of the cast-in-place pile is improved.
Further, because the length of the inner steel casing 1 is large, in order to ensure the verticality of the inner steel casing 1 during installation, second positioning blocks 7 are circumferentially arranged on the inner side wall of the middle steel casing 2 at intervals, and the distance from the side face, far away from the inner wall of the inner steel casing 1, of each second positioning block 7 to the center of the middle steel casing 2 is equal. The four second positioning blocks 7 are used for restraining the inner layer steel casing 1 to be consistent with the lifting point of the upper hydraulic vibration hammer 9 when sinking, so that the verticality of the middle layer steel casing 2 is accurately positioned by two-point one-line control, the cast-in-place pile meets the construction requirements, and the quality of the cast-in-place pile is improved.
Further, the top of the middle layer steel casing 2 is 25-35cm higher than that of the outer layer steel casing 3. Specifically, the top of the middle layer steel casing 2 is 30cm higher than the top of the outer layer steel casing 3.
Further, the top of the inner layer steel casing 1 is 25-35cm higher than the top of the middle layer steel casing 2. Specifically, the top of the inner layer steel casing 1 is 30cm higher than the top of the middle layer steel casing 2.
As shown in fig. 2, the sinking method of the ultra-long steel casing sinking system of the large-diameter ultra-deep cast-in-place pile specifically 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, thereby reducing the influence on the original ground when a hydraulic vibration hammer 9 vibrates and avoiding the collapse of the original ground caused by overlarge vibration force;
a2, through the cooperation of a crawler crane 8 and a hydraulic vibration hammer 9, vibrating and driving the outer layer steel casing 3 at the pile position which is well placed in the step A1 to enable the upper end of the outer layer steel casing 3 to be flush with the ground, then digging out the slag 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 pile casing 2 to be buried underground is longer, in order to ensure the verticality of the middle-layer steel pile casing 2 when buried underground, the central point position of the middle-layer steel pile casing 2 is firstly measured, then four first positioning blocks 6 are welded on the inner side wall of the outer-layer steel pile casing 3 and along the circumferential direction of the inner wall of the outer-layer steel pile casing 3 at intervals, the center of each first positioning block 6 is the center of the middle-layer steel pile casing 2, the four first positioning blocks 6 are used for restraining the lower part of the middle-layer pile casing to be consistent with the hoisting point of the upper hydraulic vibration hammer 9 when the middle-layer pile casing sinks, and the accurate positioning of the verticality of the middle.
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 hydraulic vibration hammer 9, finally, the slag 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 a section of thick bamboo and a section of thick bamboo with the second festival finally, rethread hoisting crawler crane 8 cooperation hydraulic vibration hammer 9 operation makes middle level steel protect a section of thick bamboo 2 and is squeezed into outer steel and protect a section.
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 hydraulic vibration hammer 9, and enabling the upper end of the inner-layer steel pile casing 1 to be 30cm higher than the upper end of the middle-layer steel pile casing 2 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 into 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 the 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 driven downwards into the lower part of the outer steel casing 3 by the operation of a hoisting crawler crane 8 in cooperation with a hydraulic vibration hammer 9.
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 (7)
1. The utility model provides a system is sunk to overlength steel of major diameter ultra-deep bored concrete pile protects a section of thick bamboo, includes hydraulic vibration hammer, crawler crane and digs the rig soon, its characterized in that: the steel pile comprises an inner steel pile casing, a middle steel pile casing sleeved outside the inner steel pile casing, an outer steel pile casing sleeved outside the middle steel pile casing, a first fixing piece arranged between the outer steel pile casing and the middle steel pile casing, and a second fixing piece arranged between the middle steel pile casing and the outer steel pile casing, wherein the inner steel pile casing, the middle steel pile casing and the outer steel pile casing are coaxially arranged, the length of the middle steel pile casing is 23-30m, the length of the outer steel pile casing is greater than that of the middle steel pile casing, the length of the outer steel pile casing is less than that of the middle steel pile casing, the first fixing piece is used for fixing the outer steel pile casing and the middle steel pile casing, and the second fixing piece is used for fixing the middle steel pile casing and the inner steel pile casing.
2. The ultra-long steel casing sinking system of the large-diameter ultra-deep cast-in-place pile according to claim 1, wherein: the length of the outer layer steel casing is 10-15m, and the length of the inner layer steel casing is 58-65 m.
3. The ultra-long steel casing sinking system of the large-diameter ultra-deep cast-in-place pile according to claim 1, wherein: the diameter of the inner layer steel casing is 2350-2450 mm, the diameter of the middle layer steel casing is 2550-2650 mm, and the diameter of the outer layer steel casing is 2750-2850 mm.
4. The ultra-long steel casing sinking system of the large-diameter ultra-deep cast-in-place pile according to claim 3, wherein: a plurality of first locating blocks are arranged on the inner side wall of the outer steel casing at intervals in the circumferential direction, and the distance from the side face, far away from the inner wall of the outer steel casing, of each first locating block to the center of the outer steel casing is equal.
5. The ultra-long steel casing sinking system of the large-diameter ultra-deep cast-in-place pile according to claim 3, wherein: and a plurality of second positioning blocks are circumferentially arranged on the inner side wall of the middle-layer steel casing at intervals, and the distance from the side surface of each second positioning block, which is far away from the inner wall of the inner-layer steel casing, to the center of the middle-layer steel casing is equal.
6. The ultra-long steel casing sinking system of the large-diameter ultra-deep cast-in-place pile according to claim 1, wherein: the top of the middle layer steel pile casing is 25-35cm higher than that of the outer layer steel pile casing.
7. The ultra-long steel casing sinking system of the large-diameter ultra-deep cast-in-place pile according to claim 1, wherein: the top of the inner layer steel pile casing is 25-35cm higher than that of the middle layer steel pile casing.
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| CN202010116610.3A CN111188339A (en) | 2020-02-25 | 2020-02-25 | Ultra-long steel pile casing sinking system of large-diameter ultra-deep cast-in-place pile |
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| CN202010116610.3A CN111188339A (en) | 2020-02-25 | 2020-02-25 | Ultra-long steel pile casing sinking system of large-diameter ultra-deep cast-in-place pile |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112523205A (en) * | 2020-11-24 | 2021-03-19 | 中铁大桥局集团第五工程有限公司 | Pile foundation construction method for easy-collapse thick covering layer opening karst cave geology |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112523205A (en) * | 2020-11-24 | 2021-03-19 | 中铁大桥局集团第五工程有限公司 | Pile foundation construction method for easy-collapse thick covering layer opening karst cave geology |
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