CN116254888A - Synchronous deviation correcting construction method for inserting and driving PHC inclined piles with ultra-large diameter - Google Patents
Synchronous deviation correcting construction method for inserting and driving PHC inclined piles with ultra-large diameter Download PDFInfo
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- CN116254888A CN116254888A CN202111507364.5A CN202111507364A CN116254888A CN 116254888 A CN116254888 A CN 116254888A CN 202111507364 A CN202111507364 A CN 202111507364A CN 116254888 A CN116254888 A CN 116254888A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D35/00—Straightening, lifting, or lowering of foundation structures or of constructions erected on foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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Abstract
The invention relates to a synchronous deviation correcting construction method for inserting and driving ultra-long large-diameter PHC inclined piles, which comprises the following steps: prefabricating a correction pile head and manufacturing a correction control system; installing a guide sleeve on the ground; temporarily fixing a correction control system in the PHC pipe pile, and installing a prefabricated correction pile head at the lower end of the PHC pipe pile; hoisting and placing the PHC pipe pile on a pile driver, wherein the axis of the pile body is aligned with the design axis; hammering the PHC tubular pile through a pile hammer, monitoring the axis of the pile body through a double-shaft dynamic inclination sensor, rotating the prefabricated deviation correcting pile head to enable the deviation correcting wing plate to be perpendicular to the plane where the design axis and the pile body axis are located if the axis of the pile body deflects, and ejecting the deviation correcting wing plate from the strip-shaped wing plate hole; hammering the PHC pipe pile to enable the pile body axis of the PHC pipe pile to deviate towards the design axis; after the pile body axis is overlapped with the design axis, retracting the deviation correcting wing plate into the circular side plate; continuously hammering the PHC pipe pile to the designed depth; and after the PHC pipe pile is implanted to the designed depth, pulling the deviation correcting control system out of the PHC pipe pile.
Description
Technical Field
The invention relates to deviation rectifying construction of PHC tubular pile inclined piles, in particular to a synchronous deviation rectifying construction method for inserting and driving PHC inclined piles with ultra-long and large diameters.
Background
PHC tubular pile is used as a prefabricated pile foundation with excellent performance and is widely applied to engineering construction. Traditional pile foundation is mainly vertical structure, and during construction, the PHC precast tubular pile is driven into the soil through pile driving device. However, with the requirement of engineering construction, an oblique pile foundation appears, which puts new requirements on the traditional pile delivery device and construction technology. With the development of construction technology, an oblique pile feeding device appears. However, because the construction operation of the inclined pile delivery is difficult, compared with the vertical pile delivery, the inclined deviation and other conditions are easier to occur; therefore, correction of the pile foundation where the inclination occurs is required.
The main measures of the conventional correction measure are as follows: (1) digging out the soil body at the reset side for unloading; (2) and applying horizontal thrust on the reset side to the pile foundation. However, the application range of the measures is limited, and the method is only suitable for the situation that pile foundations are not driven deeply and the deviation is not large. In addition, when the method is adopted for correcting the deviation, pile delivery operation is required to be stopped, and pile delivery operation is performed after the correction is completed, so that the construction efficiency is seriously affected. Therefore, when the ultra-long and large-diameter inclined pile is constructed, the pile delivery difficulty and the correction difficulty of the pile foundation are very high, and a new construction technology is urgently required to be developed, so that the construction quality of the ultra-long and large-diameter PHC inclined pile is ensured.
Disclosure of Invention
The invention aims to solve the problem of pile foundation correction in the pile delivery process of ultra-long and large-diameter PHC inclined piles, and provides a synchronous correction construction method for inserting and driving the ultra-long and large-diameter PHC inclined piles. In order to achieve the purpose, the technical scheme of the invention is as follows:
the invention relates to a synchronous deviation correcting construction method for inserting and driving ultra-long large-diameter PHC inclined piles, which comprises the following steps:
And 3, measuring the position of the lofting pile foundation, excavating pile holes on the ground, installing guide sleeves in the pile holes, arranging reinforcing steel bars outside the guide sleeves, pouring concrete guard rings, and fixing the guide sleeves.
And 5, lifting the PHC pipe pile and placing the PHC pipe pile on a pile driver, adjusting the inclination angle of the pile driver to align the axis of the pile body with the designed axis, and then slowly placing the lower end of the PHC pipe pile into a guide sleeve.
And 7, continuously hammering the PHC pipe pile through the pile hammer, and performing deviation rectifying operation according to the method in the step 6 until the PHC pipe pile is implanted to the designed depth.
And 8, after the PHC pipe pile is implanted to a designed depth, controlling the screw rod motor to move upwards along the central screw rod, enabling the supporting plate to shrink inwards, releasing the temporary fixation of the deviation correcting control system and the PHC pipe pile, and integrally pulling the deviation correcting control system out of the PHC pipe pile through the traction rope.
Preferably, in the step 1, a plurality of triangular stiffening plates are uniformly arranged between the annular wing plate and the circular side plate, and the triangular stiffening plates can improve the connection strength between the annular wing plate and the circular side plate.
Preferably, in the step 2, a limiting block and a hanging ring are arranged at the top end of the central screw rod, the limiting block prevents the screw rod motor from slipping from the top of the central screw rod, and a traction rope is connected to the hanging ring, so that the deviation correcting control system is conveniently pulled out of the PHC pipe pile integrally in the later period; the screw rod motor and the rotating motor are respectively connected with a first cable and a second cable, and the screw rod motor and the rotating motor are respectively controlled through the first cable and the second cable; the hydraulic telescopic rod is connected with the hydraulic oil pipe, and the expansion and the contraction of the hydraulic telescopic rod are controlled through the hydraulic oil pipe.
Preferably, in the step 1, the strip-shaped wing plate holes on the circular side plates are obliquely arranged, in the step 2, the inclination angles of the deviation rectifying wing plates are identical to those of the strip-shaped wing plate holes, in the step 4, the deviation rectifying wing plates are aligned with the strip-shaped wing plate holes, and the deviation rectifying wing plates can extend out of the outer sides of the prefabricated deviation rectifying pile heads from the strip-shaped wing plate holes; when the PHC pipe pile shaft axis deflects, the deviation rectifying wing plate extends out of the prefabricated deviation rectifying pile head and is inserted into the pile surrounding soil body, the PHC pipe pile is hammered downwards, the pile shaft axis is forced to deflect towards the design axis under the guidance of the deviation rectifying wing plate, and after the pile shaft axis coincides with the design axis, the deviation rectifying wing plate is retracted into the prefabricated deviation rectifying pile head.
Preferably, in the step 2, the screw rod motor may move up and down along the central screw rod, and the movable support rod and the support plate are provided with a plurality of groups along the circumference of the central screw rod; the supporting plate is controlled to expand outwards or contract inwards by the downward movement or the upward movement of the screw motor, so that the deviation correcting control system is temporarily fixed on the inner side of the PHC pipe pile or is released from temporary fixation.
Preferably, in the step 2, a stiffening plate is arranged between the limiting channel steel and the bearing plate, the stiffening plate can improve the connection strength between the limiting channel steel and the bearing plate, and the limiting channel steel can provide stable and reliable limiting and guiding functions for the extension and retraction of the deviation rectifying wing plate.
Preferably, in the step 3, the axis of the guide sleeve is aligned with the design axis of the PHC pile; the bottom of the guide sleeve is provided with a sand cushion layer, and when the concrete retainer is poured, the sand cushion layer can prevent concrete from entering the guide sleeve, so that the later PHC pipe pile is difficult to drive in.
Preferably, in the step 5, a pile cap is disposed at the top of the PHC pile, and the pile cap is provided with an L-shaped through hole, and the traction rope, the first cable, the second cable and the hydraulic oil pipe penetrate out of the L-shaped through hole on the pile cap at the top of the PHC pile, so that the L-shaped through hole on the pile cap can prevent the traction rope, the first cable, the second cable and the hydraulic oil pipe from being broken by the pile hammer.
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
1. the deviation rectifying control system is arranged in the PHC pipe pile, can be controlled on the ground through an external cable, a hydraulic oil pipe and the like, and can be wholly withdrawn from the pipe pile through a traction rope after the pile is planted in place and used for the deviation rectifying construction of the next pile foundation.
2. Compared with the traditional steel structure prefabricated pile head, the prefabricated deviation correcting pile head has the advantages that two strip-shaped wing plate holes are formed in the side wall of the pile head, two groups of limiting plates are welded on the inner side of the pile head, and the manufacturing cost is low.
3. The deviation correcting control system integrates a double-shaft dynamic inclination sensor, monitors the inclination angle of the pile body axis in real time, and can immediately correct the pile body when the pile body axis deflects relative to the design axis, so that the deviation correcting difficulty is increased due to overlarge pile foundation deviation is avoided.
4. The pile cap at the top of the pipe pile is provided with an L-shaped through hole, and the hauling rope, the cable, the hydraulic oil pipe and the like penetrate out of the L-shaped through hole in the pile cap, so that the situation that the hauling rope, the cable and the hydraulic oil pipe are broken by a pile hammer is avoided.
5. The PHC inclined pile deviation correcting pile tip and the control system can obviously improve the driving precision of the PHC inclined pile, reduce the difficulty of deviation correcting operation and improve the pile planting efficiency.
Drawings
FIG. 1 is a schematic diagram of a deviation correcting device installation structure;
FIG. 2 is a schematic illustration of the mounting structure of the correction device (another view of FIG. 2);
FIG. 3 is a schematic view of a three-dimensional structure of a rectification wing plate;
FIG. 4 is a cross-sectional view of a pre-formed correction pile head (section A-A in FIG. 6);
FIG. 5 is a cross-sectional view of the precast error correcting pile head (section B-B in FIG. 6);
FIG. 6 is a half cross-sectional view of a three-dimensional structure of a prefabricated deviation correcting pile head;
FIG. 7 is a schematic diagram of a deviation correcting device and pile head mounting structure;
FIG. 8 is a schematic view of a deviation correcting device and pile head mounting structure (another view of FIG. 7);
FIG. 9 is a schematic diagram of a deviation correcting device and pile head mounting and positioning structure;
FIG. 10 is a schematic view of a deviation correcting device and pile head mounting and positioning structure;
FIG. 11 is a schematic view of the structure of the rectification wing plate and pile head (section C-C in FIG. 8);
FIG. 12 is a schematic view of the structure of the rectification wing plate and pile head (section D-D in FIG. 9);
FIG. 13 is a schematic view of the structure of the rectification wing plate and pile head (section E-E in FIG. 10);
FIG. 14 is a schematic view of a floor guide sleeve construction;
FIG. 15 is a schematic view of PHC diagonal pile insertion construction;
FIG. 16 is a schematic view of a pile cap construction;
FIG. 17 is a schematic view of the deviation correcting wing plate relative to the pile shaft axis and the design axis during deviation correction.
The drawing is marked: the pile comprises a 1-PHC pipe pile, a 21-round side plate, a 22-ring-shaped wing plate, a 23-triangular stiffening plate, a 24-conical bottom plate, a 25-limiting plate, a 26-strip-shaped wing plate hole, a 31-center screw, a 32-screw motor, a 33-first cable, a 34-movable supporting rod, a 35-supporting plate, a 36-base, a 37-limiting block, a 38-lifting ring, a 39-traction rope, a 41-rotating motor, a 42-second cable, a 43-rotating shaft, a 44-double-shaft dynamic inclination sensor, a 51-bearing plate, a 52-deviation rectifying wing plate, a 53-limiting channel steel, a 54-stiffening plate, a 55-hydraulic telescopic rod, a 56-hydraulic oil pipe, a 6-guiding sleeve, a 61-sand cushion layer, 62-reinforcing steel bars, a 63-concrete retainer, a 7-pile driver, a 71-pile hammer, a 72-pile cap, a 73-L-shaped through hole, a 81-design axis and a 82-pile axis.
Detailed Description
In order to enhance the understanding of the present invention, the following examples of the present invention will be described in detail with reference to fig. 1 to 16, and the following examples are provided by carrying out the present invention on the basis of the technical solution of the present invention, and the detailed embodiments are given, but the scope of the present invention is not limited to the following examples.
The invention relates to a synchronous deviation correcting construction method for inserting and driving ultra-long large-diameter PHC inclined piles, which comprises the following steps:
Step 2, as shown in fig. 1 to 3, the deviation rectifying control system is manufactured: a fixed central screw rod 31 is arranged on the upper surface of a base 36, a screw rod motor 32 is arranged on the central screw rod 31, one ends of two movable supporting rods 34 are respectively hinged with the screw rod motor 32 and the base 36, and the other ends of the movable supporting rods 34 are hinged with a supporting plate 35; a dual-axis dynamic tilt sensor 44 is mounted on the side wall of the base 36; a rotary motor 41 is fixedly arranged on the lower surface of the base 36, and a rotating shaft 43 of the rotary motor 41 is fixed with a bearing plate 51; the two side surfaces of the bearing plate 51 are respectively welded with a limit channel steel 53, the upper end and the lower end of the deviation rectifying wing plate 52 are inserted into the limit channel steel 53, a hydraulic telescopic rod 55 is arranged between the bearing plate 51 and the deviation rectifying wing plate 52, and two ends of the hydraulic telescopic rod 55 are respectively hinged with the bearing plate 51 and the deviation rectifying wing plate 52; as shown in fig. 1, a limiting block 37 and a hanging ring 38 are arranged at the top end of the central screw 31, the limiting block 37 prevents the screw rod motor 32 from slipping from the top of the central screw 31, and a traction rope 39 is connected to the hanging ring 38, so that the deviation rectifying control system is conveniently pulled out of the PHC pipe pile 1 integrally in the later period; the screw motor 32 and the rotary motor 41 are respectively connected with a first cable 33 and a second cable 42, and the control of the screw motor 32 and the rotary motor 41 is respectively realized through the first cable 33 and the second cable 42; the hydraulic telescopic rod 55 is connected with a hydraulic oil pipe 56, and the expansion and contraction of the hydraulic telescopic rod 55 is controlled through the hydraulic oil pipe 56.
Set up the stiffening plate 54 between spacing channel-section steel 53 and the loading board 51, the stiffening plate 54 can improve the joint strength between spacing channel-section steel 53 and the loading board 51, and spacing channel-section steel 53 can provide reliable and stable spacing and guiding action for rectifying the extension, the withdrawal of pterygoid lamina 52, and the inclination of rectifying the pterygoid lamina 52 is unanimous with the inclination of bar flange plate hole 26, as shown in figure 3.
Step 3, as shown in fig. 14, measuring the position of a lofted pile foundation, excavating a pile hole on the ground, installing a guide sleeve 6 in the pile hole, arranging a reinforcing steel bar 62 outside the guide sleeve 6, pouring a concrete retainer 63, and fixing the guide sleeve 6; the axis of the guide sleeve 6 is aligned with the design axis 81 of the PHC pipe pile 1; the bottom of the guide sleeve 6 is provided with a sand cushion layer 61, and the sand cushion layer 61 can prevent concrete from entering the guide sleeve 6 when a concrete retainer 63 is poured, so that the driving difficulty of the PHC pipe pile 1 in the later period is increased.
Step 5, as shown in fig. 15, the PHC pipe pile 1 is lifted and placed on the pile driver 7, the inclination angle of the pile driver 7 is adjusted to align the pile body axis 82 with the design axis 81, and then the lower end of the PHC pipe pile 1 is slowly placed into the guide sleeve 6; the PHC tubular pile is provided with a pile cap 72 at the top, and the pile cap 72 is provided with an L-shaped through hole 73 as shown in figure 16; the hauling cable 39, the first cable 33, the second cable 42 and the hydraulic oil pipe 56 penetrate through the L-shaped through hole 73 on the pile cap 72 at the top of the PHC pipe pile 1, and the L-shaped through hole 73 on the pile cap 72 can prevent the hauling cable 39, the first cable 33, the second cable 42 and the hydraulic oil pipe 56 from being broken by the pile hammer 71, as shown in fig. 15.
and 8, after the PHC pipe pile 1 is implanted into the designed depth, controlling the screw rod motor 32 to move upwards along the central screw rod 31, enabling the supporting plate 35 to shrink inwards, releasing the temporary fixation of the correction control system and the PHC pipe pile 1, and integrally pulling the correction control system out of the PHC pipe pile 1 through the traction rope 39.
The present invention has been described in detail with reference to the embodiments, but the description is only the preferred embodiments of the present invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention should be considered as falling within the scope of the present invention.
Claims (8)
1. The synchronous deviation correcting construction method for inserting and driving the PHC inclined piles with the super-large diameter is characterized by comprising the following steps of:
step 1, manufacturing a prefabricated deviation rectifying pile head, wherein the prefabricated deviation rectifying pile head mainly comprises a circular side plate (21), an annular wing plate (22), a conical bottom plate (24) and a limiting plate (25), the conical bottom plate (24) is welded at the bottom of the circular side plate (21), the annular wing plate (22) is welded at the outer side of the circular side plate (21), and the limiting plate (25) is welded in the circular side plate (21);
step 2, manufacturing a correction control system: a fixed central screw rod (31) is arranged on the upper surface of a base (36), a screw rod motor (32) is arranged on the central screw rod (31), one ends of two movable supporting rods (34) are respectively hinged with the screw rod motor (32) and the base (36), and the other ends of the movable supporting rods (34) are hinged with a supporting plate (35); a double-shaft dynamic inclination sensor (44) is arranged on the side wall of the base (36); a rotary motor (41) is fixedly arranged on the lower surface of the base (36), and a rotating shaft (43) of the rotary motor (41) is fixed with the bearing plate (51); the two side surfaces of the bearing plate (51) are respectively welded with limit channel steel (53), the upper end and the lower end of the deviation rectifying wing plate (52) are inserted into the limit channel steel (53), a hydraulic telescopic rod (55) is arranged between the bearing plate (51) and the deviation rectifying wing plate (52), and two ends of the hydraulic telescopic rod (55) are respectively hinged with the bearing plate (51) and the deviation rectifying wing plate (52);
measuring the position of a lofting pile foundation, excavating a pile hole on the ground, installing a guide sleeve (6) in the pile hole, arranging a reinforcing steel bar (62) at the outer side of the guide sleeve (6) and pouring a concrete retainer (63), and fixing the guide sleeve (6);
step 4, placing the correction control system into the PHC pipe pile (1) from the lower end of the PHC pipe pile (1), then controlling a screw motor (32) to move downwards along a central screw rod (31) to enable a supporting plate (35) to extend outwards to be closely attached to the inner wall of the PHC pipe pile (1), and temporarily fixing the correction control system in the PHC pipe pile (1); then, the prefabricated deviation correcting pile head is arranged at the lower end of the PHC pipe pile (1), the round side plate (21) is inserted into the PHC pipe pile (1), and two vertical side edges of the bearing plate (51) are respectively inserted into a gap between two adjacent limiting plates (25);
step 5, hoisting and placing the PHC pipe pile (1) on a pile driver (7), adjusting the inclination angle of the pile driver (7) to align the pile body axis (82) with the design axis (81), and then slowly placing the lower end of the PHC pipe pile (1) into a guide sleeve (6);
step 6, hammering the PHC pipe pile (1) through a pile hammer (71), and implanting the PHC pipe pile (1) into the soil body; in the hammering process, a pile body axis (82) is monitored in real time through a double-shaft dynamic inclination sensor (44), if the pile body axis (82) deflects relative to a design axis (81), a prefabricated deviation correcting pile head is rotated through a rotating motor (41), a deviation correcting wing plate (52) is perpendicular to planes of the design axis (81) and the pile body axis (82), and a deviation correcting wing plate (52) is ejected out of a strip-shaped wing plate hole on a circular side plate (21) through an extension hydraulic telescopic rod (55); continuously hammering the PHC pipe pile (1) to enable a pile body axis (82) of the PHC pipe pile (1) to deviate towards a design axis (81); after the pile shaft axis (82) is overlapped with the design axis (81), shortening the hydraulic telescopic rod (55) to retract the deviation correcting wing plate (52) into the circular side plate (21);
step 7, hammering the PHC pipe pile (1) continuously through a pile hammer (71), and performing deviation rectifying operation according to the method in the step 6 until the PHC pipe pile (1) is implanted into the designed depth;
and 8, after the PHC pipe pile (1) is implanted into the designed depth, controlling the screw rod motor (32) to move upwards along the central screw rod (31) to enable the supporting plate (35) to shrink inwards, releasing the temporary fixation of the deviation correcting control system and the PHC pipe pile (1), and integrally pulling the deviation correcting control system out of the PHC pipe pile (1) through the traction rope (39).
2. The synchronous deviation rectifying construction method for inserting and driving ultra-long large-diameter PHC inclined piles according to claim 1, wherein in the step 1, a plurality of triangular stiffening plates (23) are uniformly arranged between the annular wing plates (22) and the circular side plates (21).
3. The synchronous deviation rectifying construction method for inserting and driving the ultra-long large-diameter PHC inclined pile according to claim 1, wherein in the step 2, a limiting block (37) and a hanging ring (38) are arranged at the top end of the central screw rod (31), the limiting block (37) prevents the screw rod motor (32) from slipping from the top of the central screw rod (31), and a traction rope (39) is connected to the hanging ring (38); the screw rod motor (32) and the rotating motor (41) are respectively connected with a first cable (33) and a second cable (42); the hydraulic telescopic rod (55) is connected with a hydraulic oil pipe (56).
4. The construction method for synchronously rectifying pile insertion and driving of ultra-long and large-diameter PHC according to claim 1, wherein in the step 1, the strip-shaped wing plate holes (26) on the circular side plates (21) are obliquely arranged, in the step 2, the inclination angle of the rectifying wing plates (52) is consistent with the inclination angle of the strip-shaped wing plate holes (26), in the step 4, the rectifying wing plates (52) are aligned with the strip-shaped wing plate holes (26), and the rectifying wing plates (52) can extend out of the outer sides of the prefabricated rectifying pile heads from the strip-shaped wing plate holes (26).
5. The construction method for synchronously rectifying the insertion and driving of the ultra-long and large-diameter PHC inclined piles according to claim 1, wherein in the step 2, the screw rod motor (32) can move up and down along the central screw rod (31), and the movable supporting rods (34) and the supporting plates (35) are circumferentially arranged in a plurality of groups along the central screw rod (31).
6. The construction method for synchronously rectifying the pile insertion and driving of the ultra-long and large-diameter PHC according to claim 1, wherein in the step 2, a stiffening plate (54) is arranged between the limit channel steel (53) and the bearing plate (51).
7. The construction method for synchronously rectifying the insertion and the driving of the ultra-long and large-diameter PHC inclined pile according to claim 1, wherein in the step 3, the axis of the guide sleeve (6) is aligned with the design axis (81) of the PHC tubular pile (1); the bottom of the guide sleeve (6) is provided with a sand cushion layer (61).
8. The construction method for synchronously rectifying the pile insertion and driving of the ultra-long and large-diameter PHC inclined pile according to claim 1, wherein in the step 5, a pile cap (72) is arranged at the top of the PHC pile, an L-shaped through hole (73) is formed in the pile cap (72), and a traction rope (39), a first cable (33), a second cable (42) and a hydraulic oil pipe (56) penetrate out of the L-shaped through hole (73) in the pile cap (72) at the top of the PHC pile (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111507364.5A CN116254888A (en) | 2021-12-10 | 2021-12-10 | Synchronous deviation correcting construction method for inserting and driving PHC inclined piles with ultra-large diameter |
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| CN202111507364.5A CN116254888A (en) | 2021-12-10 | 2021-12-10 | Synchronous deviation correcting construction method for inserting and driving PHC inclined piles with ultra-large diameter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117383412A (en) * | 2023-12-08 | 2024-01-12 | 中交第一航务工程局有限公司 | Internal expanding PHC pipe pile lifting appliance and use method thereof |
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2021
- 2021-12-10 CN CN202111507364.5A patent/CN116254888A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117383412A (en) * | 2023-12-08 | 2024-01-12 | 中交第一航务工程局有限公司 | Internal expanding PHC pipe pile lifting appliance and use method thereof |
| CN117383412B (en) * | 2023-12-08 | 2024-03-01 | 中交第一航务工程局有限公司 | Internal expanding PHC pipe pile lifting appliance and use method thereof |
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