CN110004964B - Replacement and repair process for pile top flange of single-pile foundation - Google Patents
Replacement and repair process for pile top flange of single-pile foundation Download PDFInfo
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- CN110004964B CN110004964B CN201910109663.XA CN201910109663A CN110004964B CN 110004964 B CN110004964 B CN 110004964B CN 201910109663 A CN201910109663 A CN 201910109663A CN 110004964 B CN110004964 B CN 110004964B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
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- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D37/00—Repair of damaged foundations or foundation structures
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Abstract
The invention discloses a replacement and repair process for a pile top flange of a single-pile foundation, which comprises the following specific steps of: A. dismantling the original flange; B. mounting and preparing before a flange; C. an inner platform device is built on the inner side of the flange; D. installing a flange; E. welding a flange; F. inspecting after welding; pile driving and pile stabilizing platform device comprises a lower layer platform mechanism, a stand column mechanism, an upper layer hoop mechanism, a jacking mechanism and a platform supporting mechanism, wherein the stand column mechanism is connected with the lower layer platform mechanism and the upper layer hoop mechanism, a single pile foundation penetrates through the upper layer hoop mechanism from top to bottom and the jacking mechanism is arranged on the outer side of the upper layer hoop mechanism and is arranged on the jacking of the single pile foundation, and the platform supporting mechanism is arranged on the outer side end face of the lower layer platform mechanism. The invention has the following advantages: the method has the advantages of orderly steps, effectively ensuring the temperature and humidity of the construction environment, improving the safety operation, ensuring the levelness and the planeness of the flange, and ensuring the stable and efficient operation of the flange replacement and repair.
Description
Technical Field
The invention belongs to the field of offshore wind power, and particularly relates to a replacement and repair process for a single-pile foundation pile top flange.
Background
China has a vast sea area, offshore wind energy resources are abundant, the potential of wind power generation is extremely high, and offshore wind power enters a large-scale construction stage along with independent development and application of new wind power technologies, new materials and new processes. The foundation construction of the wind turbine is one of the important links of offshore wind power construction. The foundation type of the offshore wind generating set comprises a gravity foundation and a pile foundation, and in addition, the floating foundation technology is also in research and development. The pile-supported foundation comprises a single-pile foundation, a multi-pile concrete cap foundation and a multi-pile jacket foundation.
After the single-pile foundation is inserted on the sea, when the levelness and the flatness of the pile top flange cannot meet the requirements, the single-pile foundation pile top flange needs to be replaced and repaired, when the flange is replaced, the original flange needs to be detached and then installed and welded, meanwhile, the single-pile foundation pile top flange needs to be replaced and repaired on the sea for operation, air convection and humidity in a construction area are high, certain difficulty is brought to replacement and repair of the single-pile foundation pile top flange, especially for original flange detachment and flange welding, the welding quality is poor, and the ovality and the flatness of a pipe end after replacement cannot be guaranteed; the steps of the traditional pile top flange replacement and repair process are disordered, and a relatively perfect process is not provided to improve the working efficiency; because the operation is carried out on the top of the single-pile foundation when the flange at the top of the single-pile foundation is replaced and repaired, the transport ship is close to the offshore position of the single-pile foundation and the pile stabilizing platform is temporarily built around the single-pile foundation through the transport ship for the operation personnel to climb, because of the unsafe factors existing in the offshore operation and the influence of sea wind and sea water, the requirement on the stability of a single pile foundation is extremely high, the existing pile stabilizing platform consists of a plurality of guide steel pipes inserted into the seabed, the construction platform is built on the upper part of the guide steel pipe, the structure is simple, the climbing construction is only carried out by personnel, the operation safety of the personnel cannot be ensured at all, particularly when the pile top flange is constructed, the requirement on the stability of a single pile foundation is extremely high, otherwise, the welding precision of the flange is affected, certain difficulty is brought to replacement and repair work, and the requirements on the levelness and the flatness of the flange cannot be guaranteed.
Disclosure of Invention
The invention aims to provide a replacement and repair process for a single-pile foundation pile top flange, which aims to overcome the defects of the prior art, has ordered steps, effectively ensures the temperature and humidity of the construction environment, improves the safety operation, ensures the levelness and the flatness of the flange, and ensures the stable and efficient replacement and repair of the flange.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a replacement and repair process for a single-pile foundation pile top flange comprises the following specific steps:
A. dismantling an original flange:
a. firstly, hoisting a single-pile foundation sleeve cage away, fastening a pile body by using a pile driving and stabilizing platform device, adjusting the pile driving and stabilizing platform device to enable the height of the pile driving and stabilizing platform device to be 1200mm-1500mm below a pile top flange top, and filling a gap between the pile driving and stabilizing platform device and the single-pile foundation pile body by erecting a scaffold plate;
b. a yurt is erected above the pile driving and stabilizing platform device, and a pile top flange is arranged at the central position in the yurt in an overhead mode;
c. measuring ovality, perimeter and flatness of the pipe end of the single-pile foundation, and recording;
d. determining a cutting reference line and checking the reference line, selecting the cutting reference point to be 30mm below the lowest point of the lower opening of the original flange welding line, measuring by using a horizontal tube to ensure the integral level of the cutting reference line, cutting off the heat affected zone of the original welding line, marking the checking reference line at the position of 100mm-120mm below the cutting reference line, and providing a reference for subsequent checking;
e. cutting the original flange welding seam along a cutting datum line by using magnetic cutting equipment, ensuring the levelness and the flatness of the pipe end of the single-pile foundation in the cutting process, measuring the ovality, the perimeter and the flatness of the pipe end again after the cutting is finished, and polishing the pipe end to meet the size requirement by using a polishing machine if the ovality, the perimeter and the flatness are not consistent with the data in the step c;
B. mounting and preparing before a flange:
a. preparing tools, namely a flame cutting machine and a magnetic cutting device; oxygen, propane, carbon dioxide shielding gas; preheating a heating plate and heat preservation cotton; the method comprises the following steps of (1) customizing a flange by using a dioxygen welding machine, a carbon planer, a dioxygen welding wire, an electric grinding machine, a 220V power line, a temperature measuring gun, a Mongolian yurt and a three-proofing cloth, and ensuring the in-plane inclination of the flange to be 0.5-1 mm;
b. measuring the perimeter of the pipe end of the single-pile foundation by adopting a stay wire method, measuring the length of the stay wire by using a measuring tape, and measuring the level of the pipe end by using a horizontal pipe;
c. cutting lines are marked on the inner side and the outer side of the pipe end, a semi-automatic flame cutting machine is used for cutting a groove, an inner groove 2/3, an outer groove 1/3 and a truncated edge are 3-4mm, an electric grinding machine is used for smoothing the groove, surface oxide skin is removed, and the condition that no oxide exists in the range of 25mm on the two sides of a welding line is ensured;
C. the flange inner side is built with an inner platform device:
the flange is characterized in that a first bracket plate, a second bracket plate and a third bracket plate are sequentially welded on the inner side end face of the flange from bottom to top, the first bracket plate and the second bracket plate are tightly attached to each other, the lengths of the first bracket plate and the second bracket plate are respectively longer than the length of the third bracket plate, a U-shaped inner platform plate is arranged above the side end face of the second bracket plate far away from the flange, reinforcing ribs are arranged at the position, facing the flange, of the opening of the inner platform plate and the position, facing the flange, of the inner platform plate, of the opening end of the inner platform plate, the inner platform plate and the second bracket plate are connected through a connecting plate arranged in an inclined mode, a ring plate arranged transversely above the third bracket plate is arranged on the inner side end face of the flange, a first foot plate is arranged above the ring plate and connected with the inner side end face of the flange, an L-shaped second foot plate is arranged at the position, facing the inner platform plate, the upper end face of the ring plate is abutted to the L-shaped opening of the second foot plate, the upper end face of the second inner platform plate, and the upper end face Contacting;
D. installing a flange:
a. b, converting the circumference of the end of the single-pile foundation pipe measured in the step B into a diameter, and calculating the difference between the diameter and the diameter of the flange to ensure the misalignment amount when the flange is integrally installed;
b. protective measures are made on the inner platform device, workers stand on the inner platform device to measure the size of the integral flange by using angle squares, and the flange and the end of the single-pile foundation pipe are installed;
c. tack welding is carried out, the interval is 500mm-550mm, the length is 200mm-250mm, after the installation is finished, the flatness and the inward inclination of the flange are measured by using a laser planometer, if the deviation is large, the flange surface is rotated, and then tack welding and measurement are carried out;
E. welding a flange:
a. preheating by an electric heating sheet at the temperature of more than 100 ℃ and 110 ℃;
b. performing transverse welding on a flange welding line, and when the filling amount of an inner side welding line is 2/3, performing carbon gouging on the reverse side of the welding line to remove roots, and polishing the welding line smoothly; after carbon planing, symmetrically welding the inner side and the outer side at the same time, and measuring the flatness and the inward inclination of the flange after welding 1-2 layers;
c. welding the outer side of the welding seam, wherein the inner side and the outer side of the welding seam are symmetrical;
d. after welding, performing heat preservation at 200-300 ℃ for 1-2h for dehydrogenation treatment, then performing slow cooling after welding by using heat preservation cotton, and cooling at the speed of 50 ℃ per hour;
F. and (3) post-welding inspection:
a. performing surface detection on the appearance of the welding seam, enabling the edge of the welding seam to smoothly transit to a base metal, enabling the height of the welding seam to be no more than 3mm, and enabling the surface of the welding seam to have no cracks, slag inclusion, unfused, pores, welding beading, arc pits and undercut;
b. measuring the flatness and the inward inclination of the flange by using a laser planometer, and carrying out fine adjustment treatment by flame straightening if a local overproof phenomenon exists;
c. and after the test is qualified, laying three-proofing cloth on the ground of the pile driving and stabilizing platform device, coating, cleaning and evacuating from a construction site.
Further, pile driving and pile stabilizing platform device comprises a lower layer platform mechanism, a stand column mechanism, an upper layer hoop mechanism, a jacking mechanism and a platform supporting mechanism, wherein the stand column mechanism is connected with the lower layer platform mechanism and the upper layer hoop mechanism, a single pile foundation penetrates through the upper layer hoop mechanism from top to bottom, the jacking mechanism is arranged on the outer side of the upper layer hoop mechanism and is arranged on the jacking of the single pile foundation, and the platform supporting mechanism is arranged on the outer end face of the lower layer platform mechanism.
Furthermore, the lower layer platform mechanism comprises four guide steel pipes which are vertically enclosed into a rectangular structure, and an upper platform and a lower platform which are correspondingly arranged up and down, the peripheries of the upper platform and the lower platform are connected with the four guide steel pipes, the upper platform and the lower platform are connected through a plurality of vertical steel pipes and inclined steel pipes, the upper platform and the lower platform respectively comprise a plurality of vertically arranged and transversely arranged beams, adjacent beams are connected through supporting inclined pipes, one side end face of the upper platform and one side end face of the lower platform are provided with a notch for accommodating the vertical embedding of the single pile foundation, and the notch is an inward-sunken arc-shaped structure;
the upright post mechanism comprises an upright post arranged above the upper platform and a cross beam arranged above the upright post horizontally, and the upright post is provided with a ladder stand;
the upper hoop mechanism comprises a left hoop and a right hoop which are movably connected with the left end and the right end of the cross beam respectively, the outer side ends of the left hoop and the right hoop are connected with an opening and closing oil cylinder respectively, one end of the left hoop is embedded into one end of the right hoop and is connected with the left end and the right end of the cross beam through a vertically arranged shaft lever, the upper end of the right hoop is connected with an internally hollow oil cylinder support, the upper end of the oil cylinder support is provided with a flange plate, the outside of the oil cylinder support is sleeved with a sleeve, the side end face of the sleeve is provided with two inwards sunken and correspondingly arranged openings, the width of each opening is gradually increased from bottom to top, the upper end of the shaft lever is connected with an oil cylinder connecting seat, a vertically arranged plug pin oil cylinder is connected above the oil cylinder connecting seat, the lower end of the plug pin oil cylinder is connected with the oil cylinder connecting seat, the upper end of the plug pin oil cylinder penetrates through the flange plate and is arranged above the flange plate;
the jacking mechanism comprises a plurality of jacking components which are respectively arranged on a left clamp and a right clamp, the jacking components are arranged towards the axis of a single pile foundation and comprise a guide frame, a roller bracket arranged at one end of the guide frame and an expansion bracket arranged in the guide frame, a plurality of rows and a plurality of columns of pin holes a which are uniformly arranged are arranged at two sides of the expansion bracket, a plurality of rows of pin holes b which are arranged in a staggered manner are arranged at the positions, close to the expansion bracket, of two sides of the guide frame, the pin holes a and the pin holes b are of a gourd-shaped structure which are correspondingly arranged, pin shafts are arranged through the pin holes a and the pin holes b, each pin shaft comprises a shaft body which penetrates through the pin holes a and the pin holes b and a limiting screw which is arranged on the shaft body and is vertical to the shaft body, a ring pulling body is arranged at the outer side end of the shaft body, the two side ends of the hydraulic oil cylinder are respectively connected with the guide frame through a fixed shaft a, the fixed shaft a vertically penetrates through the guide frame and is arranged in a manner that the extending direction of the fixed shaft a is vertical to the extending direction of the hydraulic oil cylinder, a reinforcing plate is arranged on the end face of the outer side of the guide frame, which is close to the fixed shaft a, the reinforcing plate is sleeved outside the fixed shaft a, one end of the hydraulic oil cylinder, which is arranged in the telescopic frame, is connected with a roller support, a roller is connected onto the roller support, and the roller is;
the platform supporting mechanism comprises supporting beams arranged on the outer end faces of the guide steel pipes, a translation beam connected with the supporting beams and a translation beam support arranged below the translation beam.
Further, the roller support comprises a flange cover connected with one end face of the guide frame, two first wall plates vertically arranged in the front and at the back of the end face of one side of the flange cover and two second wall plates vertically arranged in the front and at the back of the end face of the other side of the flange cover, one end of a hydraulic oil cylinder is clamped in the two first wall plates and connected with the two first wall plates through a fixed shaft b, a roller shaft is arranged by penetrating through the two second wall plates vertically, a shaft sleeve is sleeved outside the roller shaft, the roller sleeve is sleeved on the shaft sleeve, an oil nozzle is arranged in the roller shaft, and one end of the oil nozzle is arranged at the lower end position of the.
Furthermore, the inner side of the Mongolian yurt is provided with heat insulation cotton, the Mongolian yurt is provided with a window, and the Mongolian yurt covers the outer side of the single-pile foundation flange and is isolated from the periphery of the single-pile foundation flange by using three-proofing cloth.
Further, three-proofing cloth is laid on the scaffold board in the step A.
And further, when installing flanges in the step D, selecting clear and strong wind without air temperature of 6-30 ℃ and relative air humidity of 30-60% within a few days continuously, immediately stopping construction when the construction environment does not meet construction conditions, transferring personnel to a safe position, performing heat preservation for 1-2h after welding at 200-300 ℃, performing slow cooling after welding by using heat preservation cotton, cooling at the speed of 50 ℃ per hour, fixing binding equipment, and taking tools influencing safety away from a construction site.
And furthermore, during welding of the flange in the step E, a plurality of continuous multi-layer multi-channel symmetrical welding is adopted in the welding sequence, the inner side of the circular seam is welded firstly, the outer side is welded secondly, a welding worker needs to use a grinding machine during welding to grind arc striking and arc extinguishing points smoothly, the multi-layer multi-channel welding arc striking and arc extinguishing points are arranged, and the projection distance between the upper layer and the lower layer is more than 300 mm.
The invention has the following beneficial effects:
1. the replacement and repair process for the pile top flange of the single-pile foundation has ordered steps, the yurt is erected above the pile driving and stabilizing platform device, and the pile top flange is arranged at the central position in the yurt, so that the air convection of a construction area is avoided, the humidity of the construction area is reduced, the temperature and the humidity of the construction environment are ensured, the effective guarantee is provided for the smooth replacement and repair work of the flange, and the welding quality is ensured.
2. And D, converting the circumference of the end of the single-pile foundation pipe measured in the step B into a diameter, and calculating the difference between the diameter and the diameter of the flange, so that the misalignment amount of the flange during integral installation is ensured, the ovality deviation is avoided, and the position accuracy of the flange after replacement is ensured.
3. Pile driving and pile stabilizing platform device comprises a lower layer platform mechanism, a stand column mechanism, an upper layer hoop mechanism, a jacking mechanism and a platform supporting mechanism, the existing pile driving and pile stabilizing platform device is inserted into the seabed through a guide steel pipe, and single pile foundation tightening and fixing are realized through the upper layer hoop mechanism and the jacking mechanism, the safety of offshore operation is further improved, the levelness and the flatness of a flange are ensured simultaneously, and the flange replacement, repair, stabilization and efficient operation are ensured.
4. Left clamp of upper staple bolt mechanism, right side clamp is through opening and shutting the hydro-cylinder and realizing the enclasping and the separation of controlling the clamp, and the one end of left side clamp and the one end of right clamp are through embedded connection and through the axostylus axostyle from top to bottom through-connection, to the single pile basis of major diameter, can guarantee the firm in connection nature of left clamp and right clamp, the axostylus axostyle is through the enclasping and the separation of clamp about the realization of plug pin hydro-cylinder oscilaltion simultaneously, it carries out manual plug axostylus axostyle to need not operating personnel, when the sleeve is in the open mode, the telescopic opening is arranged in to the both ends of spacing axle promptly, then plug pin hydro-cylinder can realize free plug axostylus axostyle, when the sleeve is in mechanical protection state, the hydro-cylinder support upper end is arranged in to.
5. The jacking mechanism plays a jacking role in the pile driving and stabilizing platform device, a hydraulic oil cylinder of the jacking mechanism jacks forwards to drive a roller support connected with one end of the hydraulic oil cylinder to jack forwards, so that the single pile foundation is clamped and stabilized, rollers sleeved with the roller supports prevent the jacking mechanism from rubbing the outer surface structure of the single pile foundation when jacking towards the single pile foundation, and therefore an anti-corrosion layer on the outer surface of the single pile foundation is prevented from being damaged by friction, the lubrication degree of the rollers and the single pile foundation is further improved by the arrangement of oil nozzles, and the outer surface of the single pile foundation is protected; run through pinhole a, pinhole b through the round pin axle between leading truck and the expansion bracket and realize fixing, can realize through the position that changes pinhole a that the length that leading truck and expansion bracket were connected is flexible, and the design of this tight mechanism in top can satisfy the user demand to the single pile basis of different diameters size, and pinhole a and pinhole b are calabash-shaped structure simultaneously, and the structure of round pin axle and pinhole a, pinhole b cooperate, realize connecting firmly, adjust convenient effect.
6. The Mongolian yurt is internally provided with heat insulation cotton to ensure the welding quality of the flange.
Description of the drawings:
the following examples are presented to enable one of ordinary skill in the art to more fully understand the present invention and are not intended to limit the scope of the embodiments described herein.
FIG. 1 is a schematic structural diagram of a yurt in step A of the present invention.
Fig. 2 is a schematic structural view of the inner platform device in step C of the present invention.
Fig. 3 is a schematic structural diagram of the pile driving and stabilizing platform device.
Fig. 4 is a side view of fig. 3.
Fig. 5 is a top view of fig. 3.
Fig. 6 is a schematic view illustrating the connection between the upper hoop mechanism of fig. 3 and a single pile foundation.
Fig. 7 is a schematic structural view of the upper hoop mechanism in fig. 3.
FIG. 8 is a schematic view of the left and right clips of FIG. 3 connected together.
Fig. 9 is a structural schematic view of the opened state of the sleeve of fig. 3.
Fig. 10 is a schematic view of the sleeve of fig. 3 in a mechanically protected state.
Fig. 11 is a schematic view of the sleeve of fig. 3.
Fig. 12 is a schematic structural view of the tightening assembly of fig. 3.
Fig. 13 is a sectional view a-a of fig. 12.
Fig. 14 is a sectional view taken along line B-B of fig. 12.
Fig. 15 is a schematic structural view of the guide frame of fig. 12.
Fig. 16 is a schematic structural view of the telescopic frame of fig. 12.
Fig. 17 is a schematic structural view of the pin shaft of fig. 12.
Fig. 18 is a schematic structural view of the roller bracket of fig. 12.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
Fig. 1 shows a replacement and repair process for a single-pile foundation pile top flange, which comprises the following specific steps:
A. dismantling an original flange:
a. firstly, hoisting a single-pile foundation sleeve cage away, fastening a pile body by using a pile driving and stabilizing platform device, adjusting the pile driving and stabilizing platform device to enable the height of the pile driving and stabilizing platform device to be 1200mm-1500mm below a pile top flange top, and filling a gap between the pile driving and stabilizing platform device and the single-pile foundation pile body by erecting a scaffold plate;
b. a yurt 2 is erected above the pile driving and stabilizing platform device, and a pile top flange is arranged at the central position in the yurt 2 in an overhead mode;
c. measuring the ovality, the perimeter and the flatness of the pipe end of the single pile foundation 1, and recording;
d. determining a cutting reference line and checking the reference line, selecting the cutting reference point to be 30mm below the lowest point of the lower opening of the original flange welding line, measuring by using a horizontal tube to ensure the integral level of the cutting reference line, cutting off the heat affected zone of the original welding line, marking the checking reference line at the position of 100mm-120mm below the cutting reference line, and providing a reference for subsequent checking;
e. cutting the original flange welding seam along a cutting datum line by using magnetic cutting equipment, ensuring the levelness and the flatness of the pipe end of the single pile foundation 1 in the cutting process, measuring the ovality, the perimeter and the flatness of the pipe end again after the cutting is finished, and polishing the pipe end to meet the size requirement by using a polishing machine if the ovality, the perimeter and the flatness are not consistent with the data in the step c;
B. mounting and preparing before a flange:
a. preparing tools, namely a flame cutting machine and a magnetic cutting device; oxygen, propane, carbon dioxide shielding gas; preheating a heating plate and heat preservation cotton; the method comprises the following steps of (1) customizing a flange by using a dioxygen welding machine, a carbon planer, a dioxygen welding wire, an electric grinding machine, a 220V power line, a temperature measuring gun, a Mongolian yurt and a three-proofing cloth, and ensuring the in-plane inclination of the flange to be 0.5-1 mm;
b. measuring the circumference of the pipe end of the single pile foundation 1 by adopting a stay wire method, measuring the length of the stay wire by using a measuring tape, and measuring the level of the pipe end by using a horizontal pipe;
c. cutting lines are marked on the inner side and the outer side of the pipe end, a semi-automatic flame cutting machine is used for cutting a groove, an inner groove 2/3, an outer groove 1/3 and a truncated edge are 3-4mm, an electric grinding machine is used for smoothing the groove, surface oxide skin is removed, and the condition that no oxide exists in the range of 25mm on the two sides of a welding line is ensured;
C. the flange inner side is built with an inner platform device:
as shown in fig. 2, a first calf plate 4, a second calf plate 5 and a third calf plate 6 are welded in sequence from bottom to top on the end face of the inner side of a flange 3, the first calf plate 4 and the second calf plate 5 are arranged in a close fit manner, the lengths of the first calf plate 4 and the second calf plate 5 are respectively longer than the length of the third calf plate 6, a U-shaped inner platform plate 7 is arranged above the end face of the second calf plate 5 far away from the flange 3, the opening of the inner platform plate 7 is arranged towards the flange 3, a reinforcing rib 8 is arranged at the position of the opening end of the inner platform plate 7, the inner platform plate 7 is connected with the second calf plate 5 through a connecting plate 9 which is obliquely arranged, a ring plate 10 which is transversely arranged is arranged above the third calf plate 5 on the end face of the flange 3, a first foot plate 11 is arranged above the ring plate 10, the first foot plate 11 is connected with the end face of the flange 3, an L-shaped second foot plate 12 is arranged below the end face of the ring plate 10 far away from the flange 3, the opening of second foot plate 12 is arranged towards inner platform plate 7, the upper end of inner platform plate 7 abuts against the inside of the L-shaped opening of second foot plate 12, and the upper end of inner platform plate 7 is in contact with second foot plate 12;
D. installing a flange:
a. b, the circumference of the pipe end of the single pile foundation 1 measured in the step B is converted into a diameter, and the difference between the diameter and the diameter of the flange is calculated, so that the misalignment amount of the flange during integral installation is ensured, the ovality deviation is avoided, and the position accuracy of the flange after replacement is ensured;
b. protective measures are made on the inner platform device, workers stand on the inner platform device to measure the size of the integral flange by using angle squares, and the flange and the end of the single-pile foundation pipe are installed;
c. tack welding is carried out, the interval is 500mm-550mm, the length is 200mm-250mm, after the installation is finished, the flatness and the inward inclination of the flange are measured by using a laser planometer, if the deviation is large, the flange surface is rotated, and then tack welding and measurement are carried out;
E. welding a flange:
a. preheating by an electric heating sheet at the temperature of more than 100 ℃ and 110 ℃;
b. performing transverse welding on a flange welding line, and when the filling amount of an inner side welding line is 2/3, performing carbon gouging on the reverse side of the welding line to remove roots, and polishing the welding line smoothly; after carbon planing, symmetrically welding the inner side and the outer side at the same time, and measuring the flatness and the inward inclination of the flange after welding 1-2 layers;
c. welding the outer side of the welding seam, wherein the inner side and the outer side of the welding seam are symmetrical;
d. after welding, performing heat preservation at 200-300 ℃ for 1-2h for dehydrogenation treatment, then performing slow cooling after welding by using heat preservation cotton, and cooling at the speed of 50 ℃ per hour;
F. and (3) post-welding inspection:
a. performing surface detection on the appearance of the welding seam, enabling the edge of the welding seam to smoothly transit to a base metal, enabling the height of the welding seam to be no more than 3mm, and enabling the surface of the welding seam to have no cracks, slag inclusion, unfused, pores, welding beading, arc pits and undercut;
b. measuring the flatness and the inward inclination of the flange by using a laser planometer, and carrying out fine adjustment treatment by flame straightening if a local overproof phenomenon exists;
c. and after the test is qualified, laying three-proofing cloth on the ground of the pile driving and stabilizing platform device, coating, cleaning and evacuating from a construction site.
As shown in fig. 3 to 5, the pile-driving pile-stabilizing platform device includes a lower deck platform mechanism, a column mechanism, an upper hoop mechanism, a jacking mechanism and a platform supporting mechanism, wherein the column mechanism connects the lower deck platform mechanism and the upper hoop mechanism, the single pile foundation 1 penetrates through the upper hoop mechanism from top to bottom and the jacking mechanism is arranged outside the upper hoop mechanism and is jacked to the single pile foundation 1, and the platform supporting mechanism is arranged on the outer end face of the lower deck platform mechanism.
The lower-layer platform mechanism comprises four guide steel pipes 13 which are vertically enclosed into a rectangular structure, an upper platform 14 and a lower platform 15 which are correspondingly arranged up and down, the peripheries of the upper platform 14 and the lower platform 15 are connected with the four guide steel pipes 13, the upper platform 14 and the lower platform 15 are connected through a plurality of vertical steel pipes 16 and inclined steel pipes 17, the upper platform 14 and the lower platform 15 respectively comprise a plurality of beams 18 which are vertically arranged and transversely arranged, adjacent beams 18 are connected through supporting inclined pipes 19, one side end face of the upper platform 14 and one side end face of the lower platform 15 are provided with a notch 20 which is used for accommodating the vertical embedding of the single-pile foundation 1, and the notch 20 is of an inward-sunken arc-shaped structure;
the upright post mechanism comprises an upright post 21 arranged above the upper platform 14 and a cross beam 22 arranged above the upright post 21 in a horizontal manner, and a ladder stand 23 is arranged on the upright post 21;
as shown in fig. 6 and 7, the upper hoop mechanism includes a left hoop 24 and a right hoop 25 movably connected to the left and right ends of the cross beam 22, respectively, the outer ends of the left hoop 24 and the right hoop 25 are connected to the left and right ends of the cross beam 22 respectively, as shown in fig. 8 to 11, one end of the left hoop 24 is embedded into one end of the right hoop 25 and connected via a vertically disposed shaft rod 27, the upper end of the right hoop 25 is connected to an internally hollow cylinder support 28, the upper end of the cylinder support 28 is provided with a flange plate 29, the cylinder support 28 is externally sleeved with a sleeve 30, the side end surface of the sleeve 30 is provided with two inwardly recessed and correspondingly disposed openings 57, the width of the openings 57 is gradually increased from bottom to top, the upper end of the shaft rod 27 is connected to a cylinder connection seat 31, a vertically disposed plug-pull pin cylinder 32 is connected above the cylinder connection seat 31, the lower end of the plug-pull cylinder 32 is connected to the cylinder connection seat, the extending direction of the limiting shaft 58 is perpendicular to the extending direction of the shaft rod 27, two ends of the limiting shaft 58 are respectively arranged by penetrating through the two openings 57, and the upper end of the plug pin cylinder 32 is arranged by penetrating through the flange plate 29 and is arranged above the flange plate 29;
as shown in fig. 12 to 16, the tightening mechanism includes a plurality of tightening assemblies respectively disposed on the left clamp 24 and the right clamp 25, the tightening assemblies are all disposed toward the axis of the monopile foundation 1, the tightening assemblies include a guide frame 33, a roller bracket 34 disposed at one end of the guide frame 33, and an expansion bracket 35 disposed in the guide frame 33, two sides of the expansion bracket 35 are provided with a plurality of rows and a plurality of columns of pin holes a36 uniformly arranged, two sides of the guide frame 33 are provided with a plurality of rows of pin holes b37 disposed in a staggered manner near the expansion bracket 35, the pin holes a36 and the pin holes b37 are of a gourd-shaped structure correspondingly disposed, the through pin holes a36 and the pin holes b37 are provided with pin shafts 38, as shown in fig. 17, the pin shafts 38 include shaft bodies 39 penetrating through the pin holes a36 and b37, and limit screws 40 disposed on the shaft bodies 39 and perpendicular to the shaft bodies 39, the ring bodies of the shaft bodies 41 are provided with pull shafts 41, the guide frame 33 and the expansion bracket 35 are sequentially penetrated through the guide frame, the hydraulic oil pipe 43 is arranged on the hydraulic oil cylinder 42, two side ends of the hydraulic oil cylinder 42 are respectively connected with the guide frame 33 through a fixed shaft a44, the fixed shaft a44 vertically penetrates through the guide frame 33, the extending direction of the fixed shaft a44 is vertically arranged with the extending direction of the hydraulic oil cylinder 42, the end face of the guide frame 33, which is close to the outer side of the fixed shaft a44, is provided with a reinforcing plate 45, the reinforcing plate 45 is sleeved outside the fixed shaft a44, one end of the hydraulic oil cylinder 42, which is arranged in the telescopic frame 35, is connected with the roller bracket 34, the roller bracket 34 is connected with a roller 46, and the;
the platform supporting mechanism comprises a supporting beam 47, a translation beam 48 and a translation beam support 49, wherein the supporting beam 47 is respectively arranged on the outer side end face of the guide steel pipe 13, the translation beam 48 is connected with the supporting beam 47, and the translation beam support 49 is arranged below the translation beam 48.
As shown in fig. 18, the roller bracket 34 includes a flange cover 50 connected to one end surface of the guide frame 33, two first wall plates 51 disposed on one side end surface of the flange cover 50 and vertically disposed in front of and behind each other, and two second wall plates 52 disposed on the other side end surface of the flange cover 50 and vertically disposed in front of and behind each other, one end of the hydraulic cylinder 42 is engaged with and disposed in the two first wall plates 51 and connected to the two first wall plates 51 by a fixing shaft b53, a roller shaft 54 is disposed to vertically penetrate the two second wall plates 52, a shaft sleeve 55 is sleeved outside the roller shaft 54, the roller 46 is sleeved on the shaft sleeve 55, an oil nipple 56 is disposed in the roller shaft 54, and one end of the oil nipple 56 is disposed at a.
Be equipped with the heat preservation cotton in the yurt 2, seted up the window on the yurt 2, yurt 2 covers in the single pile basis 1 flange outside and keeps apart the single pile basis flange all around with the three proofings cloth, guarantees flange welding quality.
And further, paving three-proofing cloth on the scaffold board in the step A.
And further, when installing the flange in the step D, selecting clear and strong wind without air temperature of 6-30 ℃ and relative air humidity of 30-60% within a few days continuously, immediately stopping construction when the construction environment does not meet construction conditions, transferring personnel to a safe position, performing heat preservation for 1-2h after welding at 200-300 ℃, performing slow cooling after welding by using heat preservation cotton, cooling at the speed of 50 ℃ per hour, fixing binding equipment, and taking tools influencing safety away from a construction site.
And furthermore, during welding of the flange in the step E, multiple continuous and multilayer and multichannel symmetrical welding is adopted in the welding sequence, the inner side of the circular seam is welded firstly, the outer side is welded secondly, a welding worker needs to use a grinding machine during welding to grind arc striking and arc extinguishing points smoothly, the multilayer and multichannel welding arc striking and arc extinguishing points have projection intervals of more than 300mm in the upper layer and the lower layer.
The replacement and repair process for the pile top flange of the single-pile foundation has ordered steps, the yurt is erected above the pile driving and stabilizing platform device, and the pile top flange is arranged at the central position in the yurt, so that the air convection of a construction area is avoided, the humidity of the construction area is reduced, the temperature and the humidity of the construction environment are ensured, the effective guarantee is provided for the smooth replacement and repair work of the flange, and the welding quality is ensured.
Pile driving and pile stabilizing platform device comprises a lower layer platform mechanism, a stand column mechanism, an upper layer hoop mechanism, a jacking mechanism and a platform supporting mechanism, the existing pile driving and pile stabilizing platform device is inserted into the seabed through a guide steel pipe, and single pile foundation tightening and fixing are realized through the upper layer hoop mechanism and the jacking mechanism, the safety of offshore operation is further improved, the levelness and the flatness of a flange are ensured simultaneously, and the flange replacement, repair, stabilization and efficient operation are ensured.
The left hoop 24 and the right hoop 25 of the upper hoop mechanism realize the holding and the separation of the left hoop and the right hoop through an opening and closing oil cylinder 26, and one end of the left clamp 24 is connected with one end of the right clamp 25 by an embedded connection and is connected with the shaft lever 27 in a penetrating way from top to bottom, for the single pile foundation with larger diameter, the connection firmness of the left clamp 24 and the right clamp 25 can be ensured, meanwhile, the shaft rod 27 is lifted up and down through the pin inserting and pulling oil cylinder 32 to clamp and separate the left hoop and the right hoop without manually inserting and pulling the shaft rod 27 by an operator, when the sleeve 30 is in an open state, that is, the two ends of the limiting shaft 58 are disposed in the openings of the sleeve 30, the plug pin cylinder 32 can freely plug the shaft rod 27, and when the sleeve 30 is in a mechanical protection state, namely, the sleeve 30 rotates 90 degrees, the limit shaft 58 is arranged at the upper end of the oil cylinder support 28, the plug pin oil cylinder 32 cannot descend due to self weight, and the use safety is ensured while the use is convenient.
The jacking mechanism plays a jacking role in the pile driving and stabilizing platform device, a hydraulic oil cylinder 42 of the jacking mechanism jacks forwards to drive a roller support 34 connected with one end of the hydraulic oil cylinder 42 to jack forwards, so that the single-pile foundation 1 is clamped and stabilized, and a roller 46 sleeved on the roller support 34 prevents the jacking mechanism from rubbing the outer surface structure of the single-pile foundation 1 when jacking towards the single-pile foundation 1, so that an anti-corrosion layer on the outer surface of the single-pile foundation 1 is prevented from being damaged by friction, and the lubricating degree of the roller 46 and the single-pile foundation 1 is further improved by the arrangement of an oil nozzle 56, so that the outer surface of the single-pile foundation 1 is protected; run through pinhole a36, pinhole b37 through round pin axle 38 between leading truck 33 and the expansion bracket 35 realizes fixing, length flexible after leading truck 33 and expansion bracket 35 are connected can be realized through the position that changes pinhole a36, the design of this tight mechanism in top can satisfy the user demand to the single pile basis 1 of different diameters size, pinhole a36 and pinhole b37 are calabash-shaped structure simultaneously, the structure and pinhole a36 of round pin axle 38, pinhole b37 cooperate, it is firm to realize connecting, adjust convenient effect.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the technical solutions of the present invention, so long as the technical solutions can be realized on the basis of the above embodiments without creative efforts, which should be considered to fall within the protection scope of the patent of the present invention.
Claims (8)
1. A replacement and repair process for a single-pile foundation pile top flange is characterized by comprising the following specific steps:
A. dismantling an original flange:
a. firstly, hoisting a single-pile foundation sleeve cage away, fastening a pile body by using a pile driving and stabilizing platform device, adjusting the pile driving and stabilizing platform device to enable the height of the pile driving and stabilizing platform device to be 1200mm-1500mm below a pile top flange top, and filling a gap between the pile driving and stabilizing platform device and the single-pile foundation pile body by erecting a scaffold plate;
b. a yurt is erected above the pile driving and stabilizing platform device, and a pile top flange is arranged at the central position in the yurt in an overhead mode;
c. measuring ovality, perimeter and flatness of the pipe end of the single-pile foundation, and recording;
d. determining a cutting reference line and checking the reference line, selecting the cutting reference point to be 30mm below the lowest point of the lower opening of the original flange welding line, measuring by using a horizontal tube to ensure the integral level of the cutting reference line, cutting off the heat affected zone of the original welding line, marking the checking reference line at the position of 100mm-120mm below the cutting reference line, and providing a reference for subsequent checking;
e. cutting the original flange welding seam along a cutting datum line by using magnetic cutting equipment, ensuring the levelness and the flatness of the pipe end of the single-pile foundation in the cutting process, measuring the ovality, the perimeter and the flatness of the pipe end again after the cutting is finished, and polishing the pipe end to meet the size requirement by using a polishing machine if the ovality, the perimeter and the flatness are not consistent with the data in the step c;
B. mounting and preparing before a flange:
a. preparing tools, namely a flame cutting machine and a magnetic cutting device; oxygen, propane, carbon dioxide shielding gas; preheating a heating plate and heat preservation cotton; the method comprises the following steps of (1) customizing a flange by using a dioxygen welding machine, a carbon planer, a dioxygen welding wire, an electric grinding machine, a 220V power line, a temperature measuring gun, a Mongolian yurt and a three-proofing cloth, and ensuring the in-plane inclination of the flange to be 0.5-1 mm;
b. measuring the perimeter of the pipe end of the single-pile foundation by adopting a stay wire method, measuring the length of the stay wire by using a measuring tape, and measuring the level of the pipe end by using a horizontal pipe;
c. cutting lines are marked on the inner side and the outer side of the pipe end, a semi-automatic flame cutting machine is used for cutting a groove, an inner groove 2/3, an outer groove 1/3 and a truncated edge are 3-4mm, an electric grinding machine is used for smoothing the groove, surface oxide skin is removed, and the condition that no oxide exists in the range of 25mm on the two sides of a welding line is ensured;
C. the flange inner side is built with an inner platform device:
welding a first bracket plate, a second bracket plate and a third bracket plate in turn from bottom to top on the inner side end surface of the flange, wherein the first bracket plate and the second bracket plate are tightly adhered, the lengths of the first bracket plate and the second bracket plate are respectively longer than the length of the third bracket plate, a U-shaped inner platform plate is arranged above the side end surface of the second bracket plate far away from the flange, the opening of the inner platform plate is arranged towards the flange, a reinforcing rib is arranged at the position of the opening end of the inner platform plate, the inner platform plate is connected with the second bracket plate through a connecting plate which is obliquely arranged, the inner side end surface of the flange is arranged above the third bracket plate, a transversely arranged ring plate is arranged above the ring plate, the first foot plate is connected with the inner side end surface of the flange, an L-shaped second foot plate is arranged at the position of the ring plate far away from the side end surface of the flange, the opening of the second foot plate is arranged towards the inner platform plate, the upper end of the inner platform plate is abutted in the L-shaped opening of the second foot plate, and the upper end of the inner platform plate is contacted with the second foot plate;
D. installing a flange:
a. b, converting the circumference of the end of the single-pile foundation pipe measured in the step B into a diameter, and calculating the difference between the diameter and the diameter of the flange to ensure the misalignment amount when the flange is integrally installed;
b. protective measures are made on the inner platform device, workers stand on the inner platform device to measure the size of the integral flange by using angle squares, and the flange and the end of the single-pile foundation pipe are installed;
c. tack welding is carried out, the interval is 500mm-550mm, the length is 200mm-250mm, after the installation is finished, the flatness and the inward inclination of the flange are measured by using a laser planometer, if the deviation is large, the flange surface is rotated, and then tack welding and measurement are carried out;
E. welding a flange:
a. preheating by an electric heating sheet at the temperature of more than 100 ℃ and 110 ℃;
b. performing transverse welding on a flange welding line, and when the filling amount of an inner side welding line is 2/3, performing carbon gouging on the reverse side of the welding line to remove roots, and polishing the welding line smoothly; after carbon planing, symmetrically welding the inner side and the outer side at the same time, and measuring the flatness and the inward inclination of the flange after welding 1-2 layers;
c. welding the outer side of the welding seam, wherein the inner side and the outer side of the welding seam are symmetrical;
d. after welding, performing heat preservation at 200-300 ℃ for 1-2h for dehydrogenation treatment, then performing slow cooling after welding by using heat preservation cotton, and cooling at the speed of 50 ℃ per hour;
F. and (3) post-welding inspection:
a. performing surface detection on the appearance of the welding seam, enabling the edge of the welding seam to smoothly transit to a base metal, enabling the height of the welding seam to be no more than 3mm, and enabling the surface of the welding seam to have no cracks, slag inclusion, unfused, pores, welding beading, arc pits and undercut;
b. measuring the flatness and the inward inclination of the flange by using a laser planometer, and carrying out fine adjustment treatment by flame straightening if a local overproof phenomenon exists;
c. and after the test is qualified, laying three-proofing cloth on the ground of the pile driving and stabilizing platform device, coating, cleaning and evacuating from a construction site.
2. The replacement and repair process of the single-pile foundation pile top flange according to claim 1, characterized in that: pile driving pile stabilizing platform device includes lower floor's platform mechanism, stand mechanism, upper staple bolt mechanism, tightly constructs and platform supporting mechanism in top, lower floor's platform mechanism and upper staple bolt mechanism are connected to stand mechanism, the single pile basis runs through upper staple bolt mechanism just from top to bottom tightly constructs and arranges the upper staple bolt outside of mechanism in and tightly sets up to single pile basis top, the platform supporting mechanism arranges the outside terminal surface of lower floor's platform mechanism in.
3. The replacement and repair process of the single-pile foundation pile top flange according to claim 2, characterized in that: the lower platform mechanism comprises four guide steel pipes which are vertically enclosed into a rectangular structure, and an upper platform and a lower platform which are correspondingly arranged up and down, the peripheries of the upper platform and the lower platform are connected with the four guide steel pipes, the upper platform and the lower platform are connected through a plurality of vertical steel pipes and inclined steel pipes, the upper platform and the lower platform respectively comprise a plurality of vertically arranged and transversely arranged beams, adjacent beams are connected through supporting inclined pipes, one side end face of the upper platform and one side end face of the lower platform are provided with a notch for vertically embedding a single pile foundation, and the notch is of an inward-sunken arc-shaped structure;
the upright post mechanism comprises an upright post arranged above the upper platform and a cross beam arranged above the upright post horizontally, and the upright post is provided with a ladder stand;
the upper-layer hoop mechanism comprises a left hoop and a right hoop which are movably connected with the left end and the right end of the cross beam respectively, the outer side ends of the left hoop and the right hoop are connected with an opening-closing oil cylinder respectively, one end of the left hoop is embedded into one end of the right hoop and is connected with the left end and the right end of the cross beam through a vertically arranged shaft lever, the upper end of the right hoop is connected with an oil cylinder support seat with a hollow inner part, a flange plate is arranged at the upper end of the oil cylinder support seat, a sleeve is sleeved outside the oil cylinder support seat, the side end face of the sleeve is provided with two inwards sunken openings which are correspondingly arranged, the width of the openings is gradually increased from bottom to top, the upper end of the shaft lever is connected with an oil cylinder connecting seat, a vertically arranged inserting-pulling pin oil cylinder is connected above the oil cylinder connecting seat, the lower end of the inserting-pulling pin oil cylinder is connected with the oil cylinder connecting seat through, the upper end of the plug pin oil cylinder penetrates through the flange plate and is arranged above the flange plate;
the jacking mechanism comprises a plurality of jacking components which are respectively arranged on a left clamp and a right clamp, the jacking components are all arranged towards the axis of a single pile foundation and comprise a guide frame, a roller wheel bracket arranged at one end of the guide frame and a telescopic frame arranged in the guide frame, a plurality of rows and a plurality of columns of pin holes a which are uniformly arranged are arranged at two sides of the telescopic frame, a plurality of rows of pin holes b which are arranged in a staggered manner are arranged at the positions, close to the telescopic frame, of two sides of the guide frame, the pin holes a and the pin holes b are of a gourd-shaped structure which are correspondingly arranged, pin shafts are arranged through the pin holes a and the pin holes b and comprise shaft bodies which penetrate through the pin holes a and the pin holes b and limiting screws which are arranged on the shaft bodies and are perpendicular to the shaft bodies, a pulling ring body is arranged at the outer side end of the shaft bodies, and a hydraulic oil cylinder which is, the hydraulic oil cylinder is provided with a hydraulic oil pipe, two side ends of the hydraulic oil cylinder are respectively connected with the guide frame through a fixed shaft a, the fixed shaft a vertically penetrates through the guide frame and is arranged, the extending direction of the fixed shaft a is perpendicular to the extending direction of the hydraulic oil cylinder, the outer side end face, close to the fixed shaft a, of the guide frame is provided with a reinforcing plate, the reinforcing plate is sleeved outside the fixed shaft a, one end, placed in the telescopic frame, of the hydraulic oil cylinder is connected with the roller support, the roller support is connected with a roller, and the roller is placed outside the guide frame;
the platform supporting mechanism comprises supporting beams arranged on the outer end faces of the guide steel pipes, a translation beam connected with the supporting beams and a translation beam support arranged below the translation beam.
4. The replacement and repair process of the single-pile foundation pile top flange according to claim 3, wherein: the roller support comprises a flange cover connected with one end face of the guide frame, two first wall plates vertically arranged in the front and at the back of the end face of one side of the flange cover and two second wall plates vertically arranged in the front and at the back of the end face of the other side of the flange cover, one end of a hydraulic oil cylinder is clamped in the two first wall plates and connected with the two first wall plates through a fixed shaft b, a roller shaft is arranged by penetrating through the two second wall plates vertically, a shaft sleeve is sleeved outside the roller shaft, the roller is sleeved on the shaft sleeve, an oil nozzle is arranged in the roller shaft, and one end of the oil nozzle is arranged at the lower end position of the roller shaft.
5. The replacement and repair process of the single-pile foundation pile top flange according to claim 1, characterized in that: the inner side of the Mongolian yurt is provided with a heat-insulating cotton, the window is arranged on the Mongolian yurt, and the Mongolian yurt covers the outer side of the single-pile foundation flange and uses three-proofing cloth to isolate the periphery of the single-pile foundation flange.
6. The replacement and repair process for the top flange of the single-pile foundation pile according to claim 1, wherein in the step A, a three-proofing cloth is laid on the scaffold board.
7. The replacement and repair process of the single-pile foundation pile top flange according to claim 1, characterized in that: d, when installing the flange, selecting clear and no strong wind, 6-30 ℃ of air temperature and 30-60% of air relative humidity within a few days continuously, immediately stopping construction when the construction environment does not meet construction conditions, transferring personnel to a safe position, carrying out heat preservation for 1-2h after welding at 200-300 ℃, then carrying out slow cooling after welding by using heat preservation cotton, carrying out cooling at the speed of 50 ℃ per hour, and simultaneously fixing binding equipment to bring tools influencing safety away from a construction site.
8. The replacement and repair process of the single-pile foundation pile top flange according to claim 1, characterized in that: and E, during flange welding, welding is carried out by adopting multi-person continuous multi-layer multi-channel symmetrical welding in sequence, the inner side of the circular seam is welded firstly, the outer side is welded secondly, a welding worker needs to use a grinding machine during welding to grind arc striking and arc extinguishing points smoothly, the multi-layer multi-channel welding arc striking and arc extinguishing points are welded, and the projection distance between the upper layer and the lower layer is more than 300 mm.
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| CN201910109663.XA CN110004964B (en) | 2019-02-11 | 2019-02-11 | Replacement and repair process for pile top flange of single-pile foundation |
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| CN201910109663.XA CN110004964B (en) | 2019-02-11 | 2019-02-11 | Replacement and repair process for pile top flange of single-pile foundation |
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| JP5133103B2 (en) * | 2008-03-24 | 2013-01-30 | 岡部株式会社 | Pile head joint connecting material and pile head joint structure using the same |
| US10422323B2 (en) * | 2016-02-05 | 2019-09-24 | Vestas Wind Systems A/S | Method of replacing anchor bolts in wind turbine foundations |
| CN105862905B (en) * | 2016-05-27 | 2018-06-22 | 福建省新能海上风电研发中心有限公司 | A kind of embedding rock single-pile foundation of offshore wind farm and its construction method |
| CN107503346A (en) * | 2016-06-14 | 2017-12-22 | 五冶集团上海有限公司 | PHC tubular pile head method for repairing damage |
| CN206706802U (en) * | 2017-03-29 | 2017-12-05 | 松原电力勘测设计有限公司 | A kind of ring flange interconnection system steel tower steel pipe pile foundation |
| CN207419428U (en) * | 2017-11-20 | 2018-05-29 | 江苏长风海洋装备制造有限公司 | A kind of outer platform device for integrated form set cage |
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