CN116460351A

CN116460351A - Cutting equipment and cutting method for large-diameter steel pipe pile

Info

Publication number: CN116460351A
Application number: CN202310244451.9A
Authority: CN
Inventors: 董红利; 张益明; 徐杰; 郁杰翔
Original assignee: Shanghai Tongsheng Marine Technology Co ltd
Current assignee: Shanghai Tongsheng Marine Technology Co ltd
Priority date: 2023-03-13
Filing date: 2023-03-13
Publication date: 2023-07-21

Abstract

The utility model relates to a cutting equipment and cutting method in major diameter steel-pipe pile stake belongs to the technical field of steel-pipe pile cutting, including the base, the lifter, the rolling disc, flexible connecting rod, cutting part one, cutting part two, cutting compensation subassembly and clamping assembly, the one end of lifter is installed on the base, the other end and the rolling disc of lifter are connected, the rolling disc can rotate around the axis of lifter on the lifter, the one end of flexible connecting rod is installed on the rolling disc, the other end and the cutting compensation subassembly of flexible connecting rod are connected, clamping assembly installs on cutting compensation subassembly, clamping assembly is used for successively centre gripping cutting part one and cutting part two, cutting compensation subassembly is used for making clamping assembly have the trend of keeping away from the lift bracing piece. The method has the effect of improving the cutting quality in the large-diameter steel pipe pile.

Description

Cutting equipment and cutting method for large-diameter steel pipe pile

Technical Field

The application relates to the field of steel pipe pile cutting, in particular to a large-diameter steel pipe pile internal cutting device and a cutting method.

Background

In the construction process of water transportation engineering, a large-diameter steel pipe pile is often inserted into an underwater foundation, sludge and water in the steel pipe pile are extracted from the steel pipe pile, and then the inner wall of the large-diameter steel pipe pile is cut by means of electric oxygen cutting and the like until the upper surface of the sludge is lower than the cutting position of a target, and in the cutting process, the upper part of the large-diameter steel pipe pile is hung by a crane so as to avoid the upper part of the steel pipe pile from suddenly falling after the cutting is completed to cause unnecessary loss.

At present, the cutting mode that uses in common has electric oxygen cutting, and the staff holds cutting tool and utilizes the high heat that produces when oxygen burns to melt the inner wall of steel-pipe pile promptly, and then realize cutting, but when waiting to cut in the steel-pipe pile stake that the diameter of festival is 6.6m, because the length of cutting the orbit can reach about 20m, so if only rely on the staff to cut the inner wall of steel-pipe pile with holding cutting tool's mode, the arm of staff is in keeping same posture for a long time to cut the inner wall of steel-pipe pile and appear tiring easily to influence the quality of cutting.

Disclosure of Invention

In order to improve the cutting quality to the major diameter steel-pipe pile, first aspect, this application provides a major diameter steel-pipe pile in-pile cutting equipment.

The application provides a major diameter steel-pipe pile intra-pile cutting equipment adopts following technical scheme:

including base, lifter, rolling disc, flexible connecting rod, cutting member one, cutting member two, cutting compensation subassembly and clamping assembly, the one end of lifter is installed on the base, and the other end and the rolling disc of lifter are connected, and the rolling disc can rotate around the axis of lifter on the lifter, and flexible connecting rod's one end is installed on the rolling disc, and flexible connecting rod's the other end is connected with cutting compensation subassembly, and clamping assembly installs on cutting compensation subassembly, and clamping assembly is used for successively centre gripping cutting member one and cutting member two, and cutting compensation subassembly is used for making clamping assembly have the trend of keeping away from the lift bracing piece.

Through adopting above-mentioned technical scheme, set up the base in the central point of steel-pipe pile department earlier, then adjust the height of lift bracing piece, thereby adjust the height of rolling disc, carry out the centre gripping to cutting member one through clamping component, the length of follow-up regulation telescopic link pole, make the clamping component on the telescopic link pole can support tightly with the inner wall of steel-pipe pile after clamping cutting member one, along with the start of cutting member one, cutting compensation component makes cutting member one support tightly with the inner wall of steel-pipe pile all the time at the in-process of cutting, the staff only need promote telescopic link pole and rotates along with the rolling disc and can accomplish the cutting stroke of a circumference in the steel-pipe pile, follow-up again with cutting member one replace cutting member two continue cutting, whole process need not the staff and cut cutting member two and cut the inner wall of steel-pipe pile of cutting member two pairs, the staff has reduced because long-time handheld cutting member one or cutting member two take place the condition of hand acid shake, the effect of guaranteeing cutting quality has been reached.

Optionally, the clamping assembly comprises a clamping block I and a clamping block II, the clamping block I and the clamping block II are both installed on the cutting compensation assembly, a connecting part is arranged on the cutting compensation assembly, clamping pieces are respectively arranged on the clamping block I and the clamping block II in a penetrating mode, the clamping pieces respectively penetrate through the clamping block I and the clamping block II and then are connected with the connecting part in a threaded fit mode, a clamping space for clamping the cutting piece I and the cutting piece II is formed between the clamping block I and the clamping block II, and the cutting piece I and the cutting piece II are sequentially used for cutting the inner wall of the large-diameter steel pipe.

Through adopting above-mentioned technical scheme, the staff can make clamping block one and clamping block two move in opposite directions on cutting compensation subassembly through the mode of tightening the clamping piece to carry out the centre gripping to cutting piece one, and after cutting piece one uses, this is through the mode of unscrewing the clamping piece, makes clamping block one and clamping block two move in opposite directions on cutting compensation subassembly, thereby replace cutting piece two with cutting piece one, follow-up continue to screw up the clamping piece and can realize the clamp to cutting piece two.

Optionally, the cutting compensation subassembly includes fixed plate one, fixed plate two, two guiding axles and two springs one, fixed plate one is parallel with fixed plate two each other, fixed plate one is installed and is kept away from the one end of rolling disc at telescopic connecting rod, two guiding axles are all installed between fixed plate one and fixed plate two, the one end and the fixed plate two of guiding axle are connected, the other end of guiding axle passes fixed plate and a sliding fit in the lump with fixed plate, the spring one cover is established on the guiding axle, the one end fixed plate one of spring one is connected, the other end and the fixed plate two of spring one are connected, grip block one, grip block two sliding connection is kept away from the one side of fixed plate one at fixed plate two, the connecting portion sets up on fixed plate two.

Through adopting above-mentioned technical scheme, fixed plate one is installed on flexible connecting rod, and be provided with the guide bar on the fixed plate two, the cover is equipped with the both ends respectively with the spring one of fixed plate one with fixed plate two butt, when the length that the staff adjusted flexible connecting rod makes cutting member one or cutting member two when the inner wall butt with the major diameter steel-pipe pile, spring one is in compression state, and then makes cutting member one or cutting member two when the cutting, even there is the consumption in cutting process, spring one makes cutting member one still can carry out the butt with the inner wall of major diameter steel-pipe pile, and then guarantees the continuity of cutting operation.

Optionally, two guide shafts pass one end of fixed plate one and all are provided with the locating part, and the locating part passes through screw thread fit's mode with the guide shaft and is connected.

Through adopting above-mentioned technical scheme, the locating part makes first spring when recovering original flexible volume, and the guide bar can not deviate from fixed plate first easily to lead to the connection inefficacy between fixed plate first and the fixed plate second, simultaneously, can adjust the compression volume of spring first through twisting the locating part, thereby adjusts the inseparable degree of cutting part first and cutting part second when with the butt of major diameter steel-pipe pile inner wall.

Optionally, the first mount pad that is provided with on the fixed plate is provided with the mount pad two on the fixed plate, is provided with the measuring stick on mount pad one and the mount pad two, and the inner wall butt with major diameter steel pipe dress behind the mount pad one and the mount pad two is passed to the end in proper order to measuring stick one, and the other end of measuring stick is equipped with spacing portion, is provided with the scale mark that is used for measuring cutting piece cutting depth on the measuring stick, and the numerical value of scale mark is from being close to the direction of spacing portion towards keeping away from the direction of spacing portion grow gradually.

Through adopting above-mentioned technical scheme, be provided with mount pad one on the fixed plate one, be provided with mount pad two on the fixed plate two, measuring stick one end pass in proper order behind mount pad one with mount pad two with the inner wall butt of major diameter steel-pipe pile, and the other end of measuring stick is then provided with spacing portion, spacing portion makes the measuring stick deviate from on mount pad one or mount pad two easily, and is provided with the scale mark that the scale value increases gradually from being close to spacing portion towards keeping away from spacing portion direction on the measuring stick for the measuring stick can reflect the cutting depth of cutting track through the scale mark.

Optionally, a second spring is sleeved on the measuring rod, one end of the second spring is connected with the first mounting seat, and the other end of the second spring is connected with the limiting part.

Through adopting above-mentioned technical scheme, the one end and the mount pad one of spring two are connected, and the other end and the spacing portion on the measuring stick of spring two are connected, and this makes spacing portion deepen along with the degree of depth of cutting the orbit constantly, and the length of spring two can become longer gradually, and the elasticity of spring two reply normal position can make the tip of measuring stick support with the inner wall of major diameter steel-pipe pile all the time tightly.

Optionally, the lifting support rod comprises a lifting rod I and a lifting rod II, one end of the lifting rod I is installed on the base, the other end of the lifting rod I is penetrated in the lifting rod II, one end of the lifting rod II, far away from the lifting rod I, is connected with the rotating disc, the rotating disc can rotate around the axis of the lifting rod II on the lifting rod II, the lifting rod II is connected with the lifting rod I in a threaded fit manner, and a positioning nut is sleeved on the lifting rod I.

Through adopting above-mentioned technical scheme, through driving lifter two when lifter one rotates around self axis to adjust the height of rolling disc, further make cutting member one and cutting member two can be suitable for the cutting track of the advance assumption of different height.

Optionally, the telescopic connecting rod includes connecting rod one and connecting rod two, and the one end of connecting rod one is installed on the rolling disc, and another pot head of connecting rod one is established on connecting rod two, and connecting rod two is kept away from connecting rod one's one end and is connected with fixed plate one, connecting rod two and connecting rod one sliding fit.

Through adopting above-mentioned technical scheme, thereby through sliding the extension length of connecting rod two in connecting rod one, make cutting member one or cutting member two can be adapted in the internal diameter of the large diameter steel-pipe pile of equidimension not.

In a second aspect, the present application provides a method for cutting a large-diameter steel pipe pile into a pile, which adopts the above-mentioned large-diameter steel pipe pile cutting device, and includes the following steps:

s100: the base is arranged at the central position in the large-diameter steel pipe pile, the first cutting part is arranged between the first clamping block and the second clamping block, the height of the first cutting part is adjusted through the lifting support rod, the first cutting part is equal to the preset cutting position in the inner wall of the large-diameter steel pipe pile, and the length of the telescopic connecting rod is adjusted to enable the first cutting part to be in butt joint with the inner wall of the steel pipe pile;

s200: the telescopic connecting rod is driven to circularly move around the axis of the lifting supporting rod in the large-diameter steel pipe pile, the first cutting piece is synchronously started, the first cutting piece performs preliminary cutting at a preset cutting position on the inner wall of the large-diameter steel pipe pile, and the first cutting piece is always abutted against the inner wall of the steel pipe pile in the cutting process by the cutting compensation assembly;

s300: after the steel pipe pile is hung by the crane, the first cutting part is replaced by the second cutting part, and the second cutting part completely cuts the large-diameter steel pipe pile along the cutting track of the first cutting part;

s400: and the crane lifts the cut large-diameter steel pipe pile and removes the pile.

In summary, the present application includes at least the following beneficial technical effects:

1. through setting up base, lift bracing piece, rolling disc, flexible connecting rod and setting up cutting compensation subassembly and be used for centre gripping cutting part one or cutting part two's centre gripping subassembly on flexible connecting rod for the staff need not to adopt the mode of handheld cutting part one or handheld cutting part two can cut on the inner wall in the major diameter steel-pipe pile, thereby reduced because keep same posture for a long time so that the condition emergence of hand sour tremble influence cutting quality, reached the effect that improves cutting quality;

2. through setting up telescopic connecting rod into connecting rod one and connecting rod two, and connecting rod two can slide in connecting rod one in order to adjust the extension length of connecting rod two on connecting rod one to make cutting member one or cutting member two can the adaptation be at the internal diameter of the major diameter steel-pipe pile of equidimension not, reach application scope wider effect.

Drawings

Fig. 1 is a schematic perspective view of a large-diameter steel pipe pile internal cutting apparatus according to the present application;

FIG. 2 is a schematic cross-sectional view of the large diameter steel pipe pile interior cutting apparatus of FIG. 1 as applied to a large diameter steel pipe pile;

FIG. 3 is an enlarged partial schematic view of FIG. 1;

fig. 4 is a schematic view of the structure of fig. 3 at another view angle.

Reference numerals illustrate: 1. a base; 2. lifting the support rod; 3. a rotating disc; 4. a telescopic connecting rod; 5. a first cutting member; 6. a second cutting member; 7. a cutting compensation assembly; 8. a clamping assembly; 9. a clamping block I; 10. a clamping block II; 11. a connection part; 12. a clamping member; 13. a first fixing plate; 14. a second fixing plate; 15. a guide shaft; 16. a first spring; 17. a limiting piece; 18. a first mounting seat; 19. a second mounting seat; 20. a measuring rod; 21. a limit part; 22. scale marks; 23. a second spring; 24. a lifting rod I; 25. a lifting rod II; 26. positioning a nut; 27. a first connecting rod; 28. and a second connecting rod.

Detailed Description

The present application is described in further detail below in conjunction with figures 1-4.

Example 1:

the embodiment 1 of the application discloses cutting equipment in major diameter steel-pipe pile, refer to fig. 1-2, including base 1, lift bracing piece 2, rolling disc 3, flexible connecting rod 4, cutting compensation subassembly 7, clamping assembly 8, cutting piece one 5 and cutting piece two 6, cutting piece one 5 is the cutting head that implements carbon arc gouging, and cutting piece two 6 is the cutting head that is used for realizing the electro-oxygen cutting, wherein, base 1 places the upper surface at major diameter steel-pipe pile interior mud face, and lift bracing piece 2 vertical connection is on base 1, lift bracing piece 2 and major diameter steel-pipe pile are coaxial, lift bracing piece 2 includes lifting rod one 24 and lifting rod two 25, lifting rod one 24 vertical connection is on base 1, and lifting rod two 25 is the cover and establishes on lifting rod one 24, lifting rod two 25 and lifting rod one 24 are connected through screw-thread fit's mode, and lifting rod two 25 keep away from lifting rod one end then with rolling disc 3 rotation connection, lifting rod two 25's axis relatively on lifting rod two 25 rotation, lifting rod one end 4 is then connected with the clamping assembly 7 is connected on the clamping assembly 4 of the other end that is connected on the clamping assembly 7 is that the telescopic connecting rod 4 is installed on the side of the compensating assembly 4.

The first lifting rod 24 is further provided with a positioning nut 26, the positioning nut 26 is connected with the first lifting rod 24 in a threaded fit manner, and when the second lifting rod 25 drives the rotating disc 3 to ascend or descend to a target height, the height of the second lifting rod 25 on the first lifting rod 24 can be fixed by tightening the positioning nut 26 in a manner that the positioning nut 26 abuts against the lower end face of the second lifting rod 25.

Referring to fig. 2-3, the telescopic connecting rod 4 includes a first connecting rod 27 and a second connecting rod 28, one end of the first connecting rod 27 is connected with the rotating disc 3, one end of the first connecting rod 27, which is far away from the rotating disc 3, is sleeved on the second connecting rod 28, the second connecting rod 28 can slide along the axis of the first connecting rod 27 on the first connecting rod 27, one end of the second connecting rod 28, which is far away from the first connecting rod 27, is connected with the cutting compensation assembly 7, a limiting bolt is further arranged on the outer wall of the first connecting rod 27, which is far away from one end of the rotating disc 3, and a worker can not change the extension length of the second connecting rod 28 on the first connecting rod 27 easily by tightening the limiting bolt.

The cutting compensation assembly 7 comprises a first fixed plate 13, a second fixed plate 14, two guide shafts 15 and two first springs 16, wherein the first fixed plate 13 and the second fixed plate 14 are parallel to each other, the first fixed plate 13 is arranged at one end of the telescopic connecting rod 4, which is far away from the rotating disc 3, the two guide shafts 15 are all positioned between the first fixed plate 13 and the second fixed plate 14, one end of each guide shaft 15 is vertically connected with the second fixed plate 14, the other end of each guide shaft 15 passes through the first fixed plate 13 and is connected with a limiting piece 17, each guide shaft 15 can slide on the first fixed plate 13 along the axis of the guide shaft, the limiting piece 17 and the guide shafts 15 can be connected in a threaded fit mode, the first springs 16 are respectively sleeved on the two guide shafts 15, one ends of the first springs 16 are connected with the first fixed plate 13, the other ends of the first springs 16 are connected with the second fixed plate 14, and the limiting pieces 17 are used for preventing the guide shafts 15 from falling out of the fixed plate and simultaneously being used for preventing the first springs 16 from being compressed.

The clamping assembly 8 comprises a first clamping block 9 and a second clamping block 10, a dovetail groove is formed in one surface, far away from the guide shaft 15, of the fixing plate 14, the first clamping block 9 and the second clamping block 10 are clamped in the dovetail groove and can move relatively or reversely along the length direction of the dovetail groove, a connecting portion 11 is arranged on the fixing plate 14, clamping pieces 12 are respectively arranged on the first clamping block 9 and the second clamping block 10 in a penetrating mode, the clamping pieces 12 can be connected with the connecting portion 11 in a threaded mode, further, relative movement of the first clamping block 9 and the second clamping block 10 on the fixing plate 14 is achieved, and a clamping space for clamping the first cutting piece 5 and the second cutting piece 6 is formed between the first clamping block 9 and the second clamping block 10, so that after the first cutting piece 5 is used up, a worker can replace the first cutting piece 5, and further clamp the second cutting piece 6 through the first clamping block 9 and the second clamping block 10.

Referring to fig. 2 and 4, the first fixing plate 13 is provided with the first mounting seat 18, the second fixing plate 14 is provided with the second mounting seat 19 at a position corresponding to the first mounting seat 18, the first mounting seat 18 and the second mounting seat 19 are respectively provided with the measuring rod 20, one end of the measuring rod 20 passes through the first mounting seat 18 and the second mounting seat 19 and then abuts against the inner wall of the large-diameter steel pipe pile, the end face of the measuring rod 20 abutting against the inner wall of the large-diameter steel pipe pile is provided with the steel ball, so that the measuring rod 20 can smoothly slide on the inner wall of the large-diameter steel pipe pile, the other end of the measuring rod 20 is provided with the limiting part 21, the second spring 23 is sleeved at a position, close to the limiting part 21, of the measuring rod 20, one end of the second spring 23 is connected with the first mounting seat 18, the other end of the second spring 23 is connected with the first fixing plate 13, when the measuring rod 20 abuts against the inner wall of the large-diameter steel pipe pile, the groove is gradually cut out along with the inner wall of the large-diameter steel pipe pile due to the use of the cutting member 5, and the one end of the cutting member 5 is used for cutting the first end of the groove is in contact with the inner wall of the large-diameter steel pipe pile 16, and the length of the first spring 23 abuts against the second spring pile is always prolonged, and the bottom of the second spring is enabled to be always abutting against the inner wall of the large-diameter pile 20, and can be always stretched.

Further, in order to facilitate the operator to know the cutting depth, a scale mark 22 with a scale value gradually increasing from a position close to the limit part 21 to a position far away from the limit part 21 is provided on the measuring rod 20, and the 0 scale position of the scale mark 22 is flush with one surface of the first fixed plate 13 close to the second scale spring 23 when the second spring 23 is in place.

The implementation principle of embodiment 1 of the present application is: firstly, the base 1 is placed in the large-diameter steel pipe pile, the lifting support rod 2 on the base 1 is coaxial with the large-diameter steel pipe pile, then the height of the lifting support rod 2 is adjusted, the rotating disc 3 and the cutting part I5 clamped by the cutting compensation component 7 and the clamping component 8 on the rotating disc 3 can be flush with the target cutting height, then the length of the telescopic connecting rod 4 is adjusted, the cutting part I5 and the measuring rod 20 can be abutted to the inner wall of the large-diameter steel pipe pile, at the moment, the spring I16 is in a compressed state, and the spring II 23 is in an original length.

Then start cutting member one 5, the mode that begins simultaneously to promote flexible connecting rod 4 makes flexible connecting rod 4 drive cutting member and measuring stick 20 begin to rotate around the axis of lift bracing piece 2 in the major diameter steel-pipe pile, along with cutting member one 5 carries out the cutting on the inner wall of major diameter steel-pipe pile, the slot after cutting can appear gradually on the inner wall of major diameter steel-pipe pile, under the effect of spring one 16, cutting member one 5 is all the time abutted with the slot ground that forms after cutting, and spring two 23 is elongated, judge the cutting depth of cutting member one 5 on major diameter steel-pipe pile through reading the scale value on the measuring stick 20 at this moment, when the cutting depth reaches expectedly, tear cutting member one 5 down and change into cutting member two 6 from clamping assembly 8, promote flexible connecting rod 4 again, and then make cutting member two 6 can carry out the complete cutting to the inner wall of major diameter steel-pipe pile.

Example 2:

the embodiment 2 of the application provides a large-diameter steel pipe pile internal cutting method, which adopts the large-diameter steel pipe pile internal cutting equipment and comprises the following steps:

s100: setting a base 1 at the central position in a large-diameter steel pipe pile, installing a first cutting part 5 between a first clamping block 9 and a second clamping block 10, adjusting the height of the first cutting part 5 through a lifting support rod 2 to enable the first cutting part 5 to be equal to the preset cutting position in the inner wall of the large-diameter steel pipe pile, and adjusting the length of a telescopic connecting rod 4 to enable the first cutting part 5 to be in butt joint with the inner wall of the steel pipe pile;

s200: the telescopic connecting rod 4 is driven, so that the telescopic connecting rod 4 moves circumferentially around the axis of the lifting supporting rod 2 in the large-diameter steel pipe pile, the first cutting part 5 is synchronously started, the first cutting part 5 performs preliminary cutting at a preset cutting position on the inner wall of the large-diameter steel pipe pile, and the first cutting part 5 is always abutted against the inner wall of the steel pipe pile in the cutting process by the cutting compensation assembly 7;

s300: after the steel pipe pile is hung by the crane, the first cutting part 5 is replaced by the second cutting part 6, and the second cutting part 6 completely cuts the large-diameter steel pipe pile along the cutting track of the first cutting part 5;

In the step S200, the first cutting member 5 performs preliminary cutting on the inner wall of the large-diameter steel pipe pile by adopting the carbon arc gouging manner, so that the wall thickness of the preset cutting position becomes thin, and in the subsequent step S300, the second cutting member 6 performs cutting on the inner wall of the large-diameter steel pipe pile by adopting the electric oxygen cutting manner, and since the first cutting member 5 in the step S200 already makes the wall thickness of the preset cutting position thin, the cutting efficiency of the subsequent cutting member 6 is further improved, and meanwhile, since more water is generally distributed outside the large-diameter steel pipe pile, when the second cutting member 6 starts working, a cutting point can be randomly selected at the cutting track left by the first cutting member 6 to observe whether a large amount of water flows backward into the large-diameter steel pipe pile, thereby achieving the effect of improving the construction safety of staff.

The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims

1. An interior cutting equipment of major diameter steel-pipe pile, its characterized in that: including base (1), lift bracing piece (2), rolling disc (3), flexible connecting rod (4), cutting piece one (5), cutting piece two (6), cutting compensation subassembly (7) and clamping assembly (8), the one end of lift bracing piece (2) is installed on base (1), the other end of lift bracing piece (2) with rolling disc (3) are connected, rolling disc (3) are in can wind on lift bracing piece (2) the axis rotation of lift bracing piece (2), the one end of flexible connecting rod (4) is installed on rolling disc (3), the other end of flexible connecting rod (4) with cutting compensation subassembly (7) are connected, clamping assembly (8) are installed on cutting compensation subassembly (7), clamping assembly (8) are used for successively centre gripping cutting piece one (5) with cutting piece two (6), cutting compensation subassembly (7) are used for making clamping assembly (8) have keeping away from the trend of lift bracing piece (2).

2. The large-diameter steel pipe pile internal cutting apparatus according to claim 1, wherein: clamping assembly (8) are including clamping block one (9) and clamping block two (10), clamping block one (9) with clamping block two (10) are all installed on cutting compensation subassembly (7), still be equipped with connecting portion (11) on cutting compensation subassembly (7), clamping block one (9) with all wear to be equipped with clamping piece (12) on clamping block two (10), two clamping piece (12) pass respectively clamping block one (9) with clamping block two (10) back with connecting portion (11) are connected through screw-thread fit's mode, clamping block one (9) with form between clamping block two (10) and be used for the centre gripping cutting piece one (5) and cutting piece two (6) the centre gripping space, cutting piece one (5) with cutting piece two (6) all are used for cutting the inner wall of major diameter steel-pipe pile.

3. The large-diameter steel pipe pile internal cutting apparatus according to claim 2, wherein: the cutting compensation assembly (7) comprises a first fixed plate (13), a second fixed plate (14), two guide shafts (15) and two first springs (16), wherein the first fixed plate (13) is mutually parallel to the second fixed plate (14), the first fixed plate (13) is installed at one end of the telescopic connecting rod (4) far away from the rotating disc (3), the two guide shafts (15) are all installed between the first fixed plate (13) and the second fixed plate (14), one end of the guide shafts (15) is connected with the second fixed plate (14), the other end of the guide shafts (15) vertically penetrates through the first fixed plate (13) and is in sliding fit with the first fixed plate (13), the first springs (16) are sleeved on the first fixed plate (15), one ends of the first springs (16) are connected with the first fixed plate (13), the other ends of the first springs (16) are connected with the second fixed plate (14), one clamping block (9) is connected with the second fixed plate (14) in a sliding mode, and the first clamping block (10) is far away from the first fixed plate (14) and the second fixed plate (14) is fixedly connected with the second fixed plate (14).

4. A large diameter steel pipe pile internal cutting apparatus according to claim 3, wherein: one end of each guide shaft (15) penetrating through the corresponding fixing plate I (13) is provided with a limiting piece (17), and the limiting pieces (17) are connected with the guide shafts (15) in a threaded fit mode.

5. A large diameter steel pipe pile internal cutting apparatus according to claim 3, wherein: be provided with mount pad one (18) on fixed plate one (13), be provided with mount pad two (19) on fixed plate two (14), mount pad one (18) with be provided with measuring stick (20) between mount pad two (19), measuring stick (20) one end pass in proper order mount pad one (18) with behind mount pad two (19) with the inner wall butt of major diameter steel-pipe pile, the other end of measuring stick (20) is provided with spacing portion (21), be provided with on measuring stick (20) and be used for measuring scale mark (22) of cutting piece one (5) cutting depth, the numerical value of scale mark (22) is followed be close to the direction of spacing portion (21) is towards keeping away from the direction of spacing portion (21) grow gradually.

6. The large-diameter steel pipe pile internal cutting apparatus according to claim 5, wherein: the measuring rod (20) is sleeved with a second spring (23), one end of the second spring (23) is connected with the first mounting seat (18), and the other end of the second spring (23) is connected with the limiting part (21).

7. The large-diameter steel pipe pile internal cutting apparatus according to claim 1, wherein: the lifting support rod (2) comprises a lifting rod I (24) and a lifting rod II (25), one end of the lifting rod I (24) is installed on the base (1), the other end of the lifting rod I (24) is penetrated in the lifting rod II (25), one end, far away from the lifting rod I (24), of the lifting rod II (25) is connected with the rotating disc (3), the rotating disc (3) can rotate on the lifting rod II (25) around the axis of the lifting rod II (25), the lifting rod II (25) is connected with the lifting rod I (24) in a threaded fit mode, and a positioning nut (26) is sleeved on the lifting rod I (24).

8. A large diameter steel pipe pile internal cutting apparatus according to claim 3, wherein: the telescopic connecting rod (4) comprises a first connecting rod (27) and a second connecting rod (28), one end of the first connecting rod (27) is installed on the rotating disc (3), the other end of the first connecting rod (27) is sleeved on the second connecting rod (28), one end, far away from the first connecting rod (27), of the second connecting rod (28) is connected with the first fixing plate (13), and the second connecting rod (28) is in sliding fit with the first connecting rod (27).

9. A method for cutting a large-diameter steel pipe pile into a pile, which adopts the large-diameter steel pipe pile cutting device as set forth in any one of claims 1 to 8, and is characterized in that: the method comprises the following steps:

s100: setting a base (1) at the central position in a large-diameter steel pipe pile, installing a first cutting part (5) between a clamping block I (9) and a clamping block II (10), adjusting the height of the first cutting part (5) through a lifting support rod (2), enabling the first cutting part (5) to be at the same height as a preset cutting position in the inner wall of the large-diameter steel pipe pile, and adjusting the length of a telescopic connecting rod (4) to enable the first cutting part (5) to be in butt joint with the inner wall of the steel pipe pile;

s200: the telescopic connecting rod (4) is driven, so that the telescopic connecting rod (4) moves circumferentially around the axis of the lifting supporting rod (2) in the large-diameter steel pipe pile, the first cutting piece (5) is synchronously started, the first cutting piece (5) performs preliminary cutting at a preset cutting position on the inner wall of the large-diameter steel pipe pile, and the first cutting piece (5) is always abutted against the inner wall of the steel pipe pile in the cutting process by the cutting compensation assembly (7);

s300: after the steel pipe pile is hung by the crane, the first cutting part (5) is replaced by the second cutting part (6), and the second cutting part (6) completely cuts the large-diameter steel pipe pile along the cutting track of the first cutting part (5);