JP2007303097A - Steel pipe pile cutting device - Google Patents

Abstract

The present invention provides a steel pipe pile cutting device that requires no hanging means, is inexpensive, and can cut even when there is earth and sand on the back surface of the steel pipe pile.
A ring-shaped guide member 15 provided substantially concentrically above a pipe end 14 of a steel pipe pile 11 via a plurality of steel pipe clamps 13 that can be fixed to an upper end portion 12 of the steel pipe pile 11; A slide rail 16 provided across the guide material 15 is provided, a turning frame 17 capable of turning the guide material 15, a support frame 18 movable along the slide rail 16, and an upper portion attached to the support frame 18. A vertical support member 21 provided with a first horizontal roller 20 in contact with the inner surface 19 of the steel pipe pile 11 at the lower part, a cutting torch 22 attached to the vertical support member 21 so as to be adjustable up and down, and one end on the support frame 18 And the other end is attached to the revolving frame 17 and has a first elastic member 23 that urges the support frame 18 radially outward.
[Selection] Figure 1

Description

TECHNICAL FIELD The present invention relates to a steel pipe pile cutting device used for cutting a steel pipe pile in the ground after placing the steel pipe pile and before excavating between the piles.

In the conventional construction method, when excavating between piles for foundation driving after completion of steel pipe pile driving, excavation is performed with a large excavator (eg 0.7m ³ class backhoe), but the installed steel pipe piles will be an obstacle. If it is difficult to finish the floor surface, hand workers are assigned to finish the floor.
In addition, in the case of building a large-scale structure, a small heavy machine is installed for flooring finishing, and the work of scraping earth and sand and finishing the flooring are necessary. It takes days and is dangerous work.
On the other hand, in the construction of small-scale structures, when steel pipe pile foundations are adopted, during excavation, it may be necessary to perform excavation in a place where the backhoe bucket does not enter, which increases work by manual excavation .
Furthermore, cutting of steel pipe piles is after completion of excavation, and a steel crane is required for cutting steel pipes, which is problematic in terms of cost. Also, if cutting steel pipe piles is long, slinging is extremely dangerous. It becomes work.
In order to solve these problems, it is necessary to perform a so-called steel pipe pile pre-cutting method in which there is no steel pipe pile at the time of excavation, that is, the steel pipe pile is cut. For example, after steel pipe pile placement, before excavation between piles, for example, by cutting the steel pipe pile in the circumferential direction at a position 2 m below the ground surface and removing the steel pipe pile, normal machine excavation is achieved, and the construction efficiency is improved. As a result, the construction period can be shortened and dangerous elements in the work can be reduced.
As such a cutting device, for example, one disclosed in Patent Document 1 is known. This cutting device is supported in the suspension member in a state in which the suspension member inserted by the suspension means into the pipe of the steel pipe pile placed in the vertical direction is pressed against the inner surface through a plurality of fixing members, The rotating member to which the air plasma cutting torch is attached is driven to rotate by bringing a guide roller provided at a predetermined interval from the air plasma cutting torch into contact with the inner surface, and the steel plasma pile is made by the air plasma cutting torch. Is configured to disconnect.

Japanese Utility Model Publication No. 3-13330 (FIGS. 1 to 4)

However, in the cutting apparatus described in Patent Document 1, it is necessary to suspend the suspension member via the suspension means, and it is necessary to separately install the suspension means in the vicinity of the steel pipe pile to be cut. Further, since an air plasma cutting torch is used, the apparatus becomes expensive.
As cutting torch, in addition to air plasma cutting, acetylene gas cutting may be adopted as an inexpensive method, but acetylene gas cutting is impossible due to the earth and sand on the back of the steel pipe pile. It was.

The present invention has been made in view of such circumstances, and an object thereof is to provide a steel pipe pile cutting device that does not require a suspension means, is inexpensive, and can be cut even when there is earth and sand on the back surface of the steel pipe pile.

The steel pipe pile cutting device according to the present invention that meets the above object is provided substantially concentrically with the steel pipe pile at a position above the pipe end of the steel pipe pile via a plurality of steel pipe clamps that can be fixed to the upper end of the steel pipe pile. A ring-shaped guide material, a slide rail provided across the guide material, a turning frame capable of turning the guide material, a support frame movable along the slide rail, and the support An upper part is attached to the frame, a lower part is provided with a first horizontal roller that contacts the inner surface of the steel pipe pile, and a vertical support member provided extending downward from the support frame, and a vertical adjustment to the vertical support member A cutting torch attached to the support frame; and a first elastic member having one end fixed to the support frame and the other end attached to the swivel frame and biasing the support frame radially outward. To.

In the steel pipe pile cutting device according to the present invention, the support frame is attached to the slide rail, and the upper support is attached to the lower support frame so as to be rotatable and fixed to the upper side of the vertical support member. And the cutting torch is rotatably attached to the upper portion of the upper support frame via an auxiliary support member, and is provided on the lower portion of the auxiliary support member or the cutting torch. It is preferable that a second elastic member for urging the second horizontal roller against the inner surface of the steel pipe pile is provided between the upper part of the auxiliary support member and the upper support frame.

In the steel pipe pile cutting device according to the present invention, it is preferable to use gasoline as a fuel for the cutting torch.

In the steel pipe pile cutting device according to the present invention, the steel pipe clamp includes a clamp body disposed at intervals in the circumferential direction of the upper end portion of the steel pipe pile and a slide rod that protrudes radially outward from the clamp body in the radial direction. Preferably, the slide clamp body includes a slide clamp body, and a slide block provided at a lower end of the guide member and formed with a slide hole through which a slide rod of the slide clamp body is inserted.

In the steel pipe pile cutting device according to the present invention, the swivel frame rolls across two outer ring rollers with two flanges that roll across the outer periphery of the guide member and the inner periphery of the guide member. And has two carriages that are movable along the circumferential direction of the guide member and are connected by the slide rail through the center of the guide member. Is preferred.

The steel pipe pile cutting device according to any one of claims 1 to 5, wherein a ring-shaped guide material provided substantially concentrically with the steel pipe pile at a top end portion of the steel pipe pile via a plurality of steel pipe clamps is cut into a revolving frame capable of turning. Since the torch is attached, there is no need for a suspension means to hold the cutting torch, and since the structure for holding the cutting torch can be made compact, it can be manufactured at a low cost and easily applied to the steel pipe pile. Since it can be fixed, the workability of installation is improved.
Further, the cutting torch is attached to a vertical support member that is extended downward from a support frame that is movable along a slide rail provided across the guide material so as to be vertically adjustable, and a first horizontal Since the roller is urged to the inner surface of the steel pipe pile by the first elastic member, the steel pipe pile can be cut at an arbitrary height position by turning the turning frame, thereby improving the workability of cutting and working time. Can be shortened, and the distance between the torch head of the cutting torch and the inner surface of the steel pipe pile can be maintained constant. As a result, optimum cutting performance can be ensured.

In the steel pipe pile cutting device according to claim 2, the upper support frame is attached to the lower support frame so as to be rotatable, and the cutting torch is attached to the upper support frame via the auxiliary support member. Moreover, because the second elastic member urges the second horizontal roller provided on the lower part of the auxiliary support member or the cutting torch to the inner surface of the steel pipe pile, depending on the thickness and material of the steel pipe pile, An appropriate mounting angle of the torch head of the cutting torch and an appropriate distance to the inner surface of the steel pipe pile can be set, whereby an optimum steel pipe pile can be cut.

In the steel pipe pile cutting device according to claim 3, since gasoline is used as a fuel for the cutting torch, for example, as compared with acetylene gas, it can be cut even if there is earth and sand on the back surface of the steel pipe pile. Cutting workability is improved, and cost can be reduced.

The steel pipe pile cutting device according to claim 4, wherein a slide rod of a slide clamp body including a clamp body arranged at intervals in the circumferential direction of the upper end portion of the steel pipe pile is provided at the lower end of the guide material. By sliding into the slide hole, it is possible to easily cope with a change in the pipe diameter of the steel pipe pile, so that the apparatus can be made compact and lightweight.

In the steel pipe pile cutting device according to claim 5, the revolving frame includes two carriages that are movable along the circumferential direction of the guide material and are connected by a slide rail through the center of the guide material. Since it has two outer ring rollers with both ends that roll across the outer periphery of the guide material and one inner ring roller with both ends that rolls across the inner periphery of the guide material The swivel frame can be made compact and lightweight.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
Here, FIG. 1 is a front sectional view of a steel pipe pile cutting device according to an embodiment of the present invention, FIG. 2 is a main sectional front sectional view of the steel pipe pile cutting device, and FIG. 3 is a plan view of the steel pipe pile cutting device. 4 is an explanatory view of the main part of the steel pipe clamp and the turning frame of the steel pipe pile cutting device, FIG. 5 is a plan view of the main part of the steel pipe pile cutting device, and FIGS. 6 (A) and 6 (B) are respectively the same as FIG. It is arrow AA sectional drawing and arrow BB sectional drawing.

As shown in FIGS. 1, 3, 5, and 6 (A), a steel pipe pile cutting device 10 according to an embodiment of the present invention can be fixed to an upper end portion (pipe end portion) 12 of a steel pipe pile 11. A ring-shaped guide material 15 provided substantially concentrically with the steel pipe pile 11 above the pipe end 14 of the steel pipe pile 11 via a plurality of (four in this embodiment) steel pipe clamps 13; 15 includes a slide rail 16 provided over 15 and a turning frame 17 capable of turning the guide material 15.

The steel pipe pile cutting device 10 further includes a support frame 18 movable along the slide rail 16, and an upper part attached to the support frame 18, and a first horizontal roller 20 contacting the inner surface 19 of the steel pipe pile 11 at the lower part. A vertical support member 21 extending downward from the support frame 18; a cutting torch 22 attached to the vertical support member 21 so as to be vertically adjustable; one end is fixed to the support frame 18; Is attached to the revolving frame 17 and has a coil spring 23 which is an example of a first elastic member that urges the support frame 18 radially outward. These will be described in detail below.

As shown in FIGS. 1 to 3, 5, and 6 (A), the support frame 18 has a substantially rectangular parallelepiped lower support frame 24 attached to the slide rail 16 via a slide bearing (not shown), and a lower part. The vertical support member 21 has a substantially rectangular parallelepiped upper support frame 25 attached to the support frame 24 so as to be rotatable and fixed to the upper side of the vertical support member 21, and the vertical support member 21 attached to the upper support frame 25 includes A cutting torch 22 is rotatably attached via an auxiliary support member 26, and a second horizontal roller 27 provided at the lower part of the cutting torch 22 is urged against the inner surface 19 of the steel pipe pile 11. A coil spring 28, which is an example of the elastic member, is provided between the upper portion of the auxiliary support member 26 and the upper support frame 25.

As shown in FIGS. 1-3, the pipe end part of the steel pipe pile 11 according to the pipe diameter D (for example, nominal diameter 350-600A, 400A in this Embodiment) of the steel pipe pile 11 laid in the ground The steel pipe clamp 13 that can be fixed to the pipe 12 is divided into four equal parts in the circumferential direction of the pipe end 12 of the steel pipe pile 11, and is horizontally spaced and protrudes radially outward of the clamp body 29. The slide clamp body 31 having the slide rod 30 having the rectangular cross section and the rectangular parallelepiped shape provided with the slide hole 32 having the rectangular cross section provided at the lower end of the guide member 15 and through which the slide rod 30 of the slide clamp body 31 is inserted. And a slide block 33.

The clamp body 29 is formed in a rectangular parallelepiped shape. The tube end 14 of the steel pipe pile 11 is in contact with the lower side of the clamp body 29, and the insertion portion 34 having a reverse concave shape in cross section through which the tube end portion (thick portion) 12 is inserted. Is formed. A mounting hole 35 having the same cross-sectional shape as the slide hole 32 of the slide block 33 is formed immediately above the fitting portion 34 of the clamp body 29, and one end of the slide rod 30 is fitted into the mounting hole 35. The clamp body 29 is fixed via a fixing bolt 36. The width W of the fitting portion 34 is appropriately determined in consideration of the wall thickness t of the steel pipe pile 11.

A female screw 37 is formed horizontally on the radially outer side in communication with the fitting portion 34 of the clamp body 29, and a clamp bolt 40 that is screwed into the female screw 37 and whose tip 38 abuts against the outer surface 39 of the steel pipe pile 11 is provided. Further, a rotation bar 41 is attached to the rear end portion of the clamp bolt 40.

A vertical hole in which a female screw 42 is formed is provided at the lower end portion of the slide block 33 so as to communicate with the central portion of the slide hole 32, and a clamp bolt 45 whose tip 43 abuts against the lower surface 44 of the slide rod 30. Are screwed onto the female screw 42.
An upper end surface 46 of the slide block 33 that is divided into four equal parts in the circumferential direction is fixed to the lower surface 15 a of the guide member 15. With the above configuration, the four steel pipe clamps 13 are fixed to the pipe end portion 12 of the steel pipe pile 11 according to the pipe diameter D of the steel pipe pile 11, and the pipe end 14 of the steel pipe pile 11 is connected via the steel pipe clamp 13. The guide material 15 can be provided concentrically with the steel pipe pile 11 above.

As shown in FIGS. 2 to 5, the guide member 15 is plate-shaped and includes an outer periphery 47 and an inner periphery 48 having concentric circles with the steel pipe pile 11, and the outer periphery 49 and the inner periphery 50 have cross-sections at the front portions. Are formed with a trapezoidal shape.

The swivel frame 17 has two outer ring rollers 51 with two flanges that roll horizontally with an H-shaped cross-sectional shape provided at intervals in the circumferential direction across the outer peripheral portion 49 of the guide member 15. And an inner ring roller 52 with both ribs, which has an H-shaped cross section provided across the inner peripheral portion 50 of the guide member 15 and rolls horizontally, along the circumferential direction of the guide member 15 And two carriages 53 and 54 which are connected by the slide rail 16 through the center O of the guide member 15.

As shown in FIGS. 2 to 4, the carriage 53 (54 is the same) includes a rectangular upper frame plate 56 to which the lower surface 55 of the slide rail 16 is fixed and a plurality (four in this embodiment) of spacer members. A carriage frame 59 having a lower frame plate 58 fixed to the upper frame plate 56 with a space in the vertical direction from the upper frame plate 56 via 57 and a lower end of the lower frame plate 58 radially outside the carriage frame 59. Perpendicular to the lower ends of the lower frame plate 58 on the radially inner side of the two outer ring rollers 51 that are provided via bearings on two fixed shafts 60 that are vertically provided at intervals and that rotate in a horizontal plane. And an inner ring roller 52 that rotates in a horizontal plane and is provided on a single fixed shaft 60a.

The slide rail 16 has a substantially rectangular cross section, and both ends are fixed to the upper frame plate 56 of the carriage frame 59 by a plurality of fixing bolts (not shown). The slide rail 16 is provided with a rectangular and block-shaped lower support frame 24 that moves along the slide rail 16 via a slide bearing (not shown).

At the upper end of the lower support frame 24, one bolt (not shown) is vertically provided at a position equally divided into four in the circumferential direction, and an arcuate mounting hole 61 through which the bolt passes is circumferentially provided. A rectangular upper support frame 25 formed at a position equally divided into four in the direction is provided. With this configuration, the upper support frame 25 can be pivotally adjusted with respect to the lower support frame 24.

As shown in FIGS. 2, 3, 5, and 6 (A), rectangular mounting plates 62 and 63 are erected on the upper surface of the upper support frame 25 so as to face each other with a space therebetween. A vertical support member 21 having vertical members 64 and 65 as a pair of rectangular plates provided opposite to each other with a gap is suspended from both ends in the longitudinal direction of the mounting plates 62 and 63. The vertical members 64 and 65 of the vertical support member 21 are connected to each other by a plurality of horizontally arranged connecting members 66 at intervals in the vertical direction. In addition, the 1st horizontal roller 20 is attached to the connection member 66 via the attachment bracket 67, as shown to FIG.1 and FIG.6 (A).

On the surface of the vertical member 65 of the vertical support member 21, a rectangular plate-like auxiliary support member 26 having substantially the same size (width and length) as that of the vertical member 65 is interposed at a small angle via a pin 68 provided at the upper end. It is provided to be rotatable at (0 to 5 °).
A torch rail 69 is provided on the surface of the auxiliary support member 26 below the pin 68 along the longitudinal direction of the auxiliary support member 26, and the flat cross section of the torch rail 69 has a T-shape having flange portions on both sides of the tip portion. It is formed in a shape.

As shown in FIGS. 1 to 3 and FIGS. 6A and 6B, the cutting torch 22 includes a gasoline supply pipe 71 that supplies gasoline, which is an example of the fuel used, to the torch head 70 at the lower end, and a torch head. An oxygen gas supply pipe 72 arranged in parallel to the gasoline supply pipe 71 for supplying oxygen gas to 70, and two pipe holders for fixing the gasoline supply pipe 71 and the oxygen gas supply pipe 72 at intervals in the longitudinal direction 73 and 74, and a block-shaped joint fitting 75 provided at the upper ends of the gasoline supply pipe 71 and the oxygen gas supply pipe 72. The joint fitting 75 is formed with a gasoline flow path and an oxygen gas flow path, to which a gasoline supply source and an oxygen gas supply source are connected, respectively. The length of the cutting torch 22 is L (for example, 1 to 5 m, 2.3 m in the present embodiment).

On the pipe holders 73 and 74, lifting guide rollers 76 and 77 with both hooks, which are guided by the flanges on both sides of the torch rail 69 and roll, are arranged to face each other with a gap in the horizontal direction. With this configuration, the cutting torch 22 can be attached to and detached from the torch rail 69, and the cutting torch 22 is moved up and down along the torch rail 69 so that the torch head 70 is set at the cutting position X and is assisted by fixing means (not shown). The support member 26 can be fixed.

Furthermore, the upper support frame 25 can be pivotally adjusted with respect to the lower support frame 24 to adjust the torch mounting angle α with respect to the inner surface 19 of the steel pipe pile 11 of the torch head 70. As shown in FIG. 1, the cutting position X of the torch head 70 is located at a depth H (for example, 1 to 5 m, 2 m in the embodiment) from the GL.

Below the pipe holder 74, just above the torch head 70, like the pipe holders 73, 74, the inner surface 19 of the steel pipe pile 11 is interposed via a bracket 78 that fixes the gasoline supply pipe 71 and the oxygen gas supply pipe 72. A second horizontal roller 27 that is in contact with the roller and rolls in the circumferential direction is provided.

As shown in FIGS. 2 and 5, the upper support frame 25 has a cutting torch 22 side (lower side in FIG. 5) on the cart 53 side (left side in FIGS. 2 and 5) along the longitudinal direction of the slide rail 16. A rectangular plate-shaped mounting arm 79 is provided, and a rectangular plate-shaped spring mounting bracket 81 is erected on a rectangular base plate 80 fixed to the front side of the mounting arm 79 by screw fastening. Yes.

A pin 82 is provided on the side of the carriage 53 from the pin 68 of the auxiliary support member 26 and above the center of the pin 68. The pin 82 is provided with a base side of a rectangular plate-like joint member 83. A coil spring 28 is mounted between the front side of the member 83 and the spring mounting bracket 81. The pin 68 side of the coil spring 28 is connected to the front side of the joint member 83 via a hook 84, while a male screw is formed on the spring mounting bracket 81 side (left side in FIGS. 2 and 5) of the coil spring 28. The urging force adjusting bolt 85 is connected, and the urging force adjusting bolt 85 is fixed to the spring mounting bracket 81 via nuts 86 and 87.

With this configuration, the auxiliary support member 26 is urged around the pin 68, and the second horizontal roller 27 provided on the cutting torch 22 that can be vertically moved along the torch rail 69 fixed to the auxiliary support member 26. Can be brought into contact with the inner surface 19 of the steel pipe pile 11.

As shown in FIGS. 2, 3, and 5, a rectangular plate-like spring mounting bracket 89 is erected on the upper surface of the slide rail 16 immediately above the carriage 54 of the revolving frame 17 via a rectangular base plate 88. A coil spring 23 is attached between a mounting plate 63 erected on the upper support frame 25 and a spring mounting bracket 89.

The bogie 53 side of the coil spring 23 is hooked on a hook 91 formed on the front side of the screw joint member 90, and the base side of the screw joint member 90 is fixed to the mounting plate 63 by nuts 92 and 93. On the other hand, on the bogie 54 side (right side in FIGS. 2 and 5) of the coil spring 23, an urging force adjusting bolt 94 formed with a male screw that can move the position of the coil spring 23 according to the pipe diameter D of the steel pipe pile 11. The urging force adjusting bolt 94 is fixed to the spring mounting bracket 89 via nuts 95 and 96.

With this configuration, the first horizontal roller 20 provided at the lower portion of the vertical support member 21 attached to the lower support frame 24 movable along the slide rail 16 via the upper support frame 25 is attached to the steel pipe pile 11. It can be brought into contact with the inner surface 19 with a constant urging force. 1 denotes a holder stopper that contacts the pipe holder 74 and determines the lower limit position of the cutting torch 22.

Next, the usage method and operation (or operation) of the steel pipe pile cutting device 10 according to one embodiment of the present invention will be described with reference to the drawings.
In advance, the necessary number of steel pipe piles 11 are placed in the ground, and the steel pipe pile cutting device 10 is placed on a deposit stand (not shown).
As shown in FIG. 2, the slide rod 30 of the slide clamp body 31 of the four steel pipe clamps 13 is slid into the slide hole 32 of the slide block 33 in accordance with the pipe diameter D of the steel pipe pile 11 to be cut. After that, it is fixed to the slide block 33 by the clamp bolt 45.

Further, according to the pipe diameter D of the steel pipe pile 11, the nuts 95, 96 are operated to adjust the mounting position of the urging force adjusting bolt 94 to the spring mounting bracket 89, and the urging force adjusting bolt 94 is adjusted to the nut 95, It fixes to the spring mounting bracket 89 through 96.
Further, in consideration of the thickness t and material of the steel pipe pile 11, the rotational position of the upper support frame 25 with respect to the lower support frame 24 is adjusted, and the torch mounting angle α, that is, the steel pipe of the flame from the torch head 70 The ejection angle with respect to the inner surface 19 of the pile 11 (the inclination angle of the crater of the torch head 70 with respect to the inner surface 19 of the steel pipe pile 11) is adjusted.

The cutting torch 22 is attached to the torch rail 69 of the auxiliary support member 26 provided on the upper support frame 25, the cutting torch 22 is lowered along the torch rail 69, and the steel pipe pile cutting device 10 is moved to the steel pipe pile 11. When installed, the cutting torch 22 is separately fixed to the torch rail 69 by fixing means so that the torch head 70 is at the cutting position X.
The steel pipe pile cutting device 10 is lifted from the bank by a lifting machine, and the fitting portions 34 of the clamp main bodies 29 of the four steel pipe clamps 13 are fitted into the pipe end portions 12 of the steel pipe pile 11 to be cut. , And the steel clamp pile cutting device 10 is fixed to the steel pipe pile 11 by fixing the slide clamp body 31 to the steel pipe pile 11 via the clamp bolt 40.

If necessary, the fixing position of the urging force adjusting bolt 85 to the spring mounting bracket 81 is adjusted via the nuts 86 and 87 to adjust the urging force to the second horizontal roller 27 by the coil spring 28.
A gasoline supply source and an oxygen gas supply source are connected to the gasoline flow path and the oxygen gas flow path of the joint fitting 75 of the cutting torch 22, respectively.

The steel pipe pile 11 is ignited while supplying gasoline and oxygen gas to the torch head 70, and manually turns the revolving frame 17 slowly with respect to the guide material 15, and the hot combustion gas ejected from the crater of the torch head 70. Is cut in the circumferential direction. In addition, in the steel pipe pile 11, air is always blown by the blowing means so that the cut portion becomes deficient and does not extinguish the fire.

As shown in FIGS. 1 and 3, when the revolving frame 17 is revolved, the first horizontal roller 20 urged by the coil spring 23 via the support frame 18, the vertical support member 21, and the like is the inner surface 19 of the steel pipe pile 11. The distance between the support frame 18 and the vertical support member 21 relative to the inner surface 19 of the steel pipe pile 11 is kept constant, and the coil spring is connected via the auxiliary support member 26 and the cutting torch 22. When the second horizontal roller 27 urged by 28 abuts on the inner surface 19 of the steel pipe pile 11 and rolls, the distance between the crater of the torch head 70 and the inner surface 19 of the steel pipe pile 11 (for example, 20 to 40 mm). ) Can be kept constant.

In the actual site, when the steel pipe pile cutting device 10 is used to cut 20 steel pipe piles 11 having a nominal diameter = 400 A (pipe outer diameter = 406.4 mm), a wall thickness t = 6 mm, and a material STPY400, Compared to the conventional construction method, the excavation between piles is eliminated, so the construction period can be shortened for about 2 days.

The present invention is not limited to the above-described embodiments, and can be changed without departing from the gist of the present invention. For example, some or all of the above-described embodiments and modifications are included. The case where the steel pipe pile cutting device of the present invention is configured in combination is also included in the scope of the present invention.

In the above embodiment, the support frame is divided into a lower support frame and an upper support frame, and the auxiliary support member is configured to be rotatable with respect to the vertical support member, but is not limited thereto, and if necessary, The lower support frame and the upper support frame can be integrated so as not to adjust the rotation of the upper support frame, and the auxiliary support member can be fixed to the vertical support member. In addition, a second horizontal roller that rolls in contact with the inner surface of the steel pipe pile is provided immediately above the torch head of the cutting torch, and the second horizontal roller is urged against the inner surface of the steel pipe pile by a coil spring. However, the second horizontal roller and the coil spring can be omitted as necessary. Although the second horizontal roller is provided on the cutting torch, it may be provided below the auxiliary support member.

Although gasoline was used as the fuel for the cutting torch, the present invention is not limited to this, and other fuels that can be cut even when there is earth and sand on the back surface of the steel pipe pile can be used as necessary.
Although four steel pipe clamps are used, the present invention is not limited to this, and two, three, or five or more steel pipe clamps may be used as necessary.
The steel pipe clamp is provided with a slide clamp body and a slide block so as to correspond to the pipe diameter of the steel pipe pile, but is not limited to this, for example, if the pipe diameter of the steel pipe pile is constant The slide mechanism can be omitted.

Although the cross-sectional shape of the outer peripheral part of a guide material and the front-end | tip part of an inner peripheral part was made into trapezoid, it is not limited to this, It can also be set as another shape as needed.
Although the turning frame is turned manually, the present invention is not limited to this, and the turning frame can be turned by a driving means as required.

It is a front sectional view of the steel pipe pile cutting device concerning one embodiment of the present invention. It is a principal part front sectional view of the steel pipe pile cutting device. It is a top view of the steel pipe pile cutting device. It is principal part explanatory drawing of the steel pipe clamp and turning frame of the steel pipe pile cutting device. It is a principal part top view of the steel pipe pile cutting device. (A) and (B) are the arrow AA sectional drawing of FIG. 1, and the arrow BB sectional drawing, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10: Steel pipe pile cutting device, 11: Steel pipe pile, 12: (Upper end part) Pipe end part, 13: Steel pipe clamp, 14: Pipe end, 15: Guide material, 15a: Lower surface, 16: Slide rail, 17: Turning frame , 18: support frame, 19: inner surface, 20: first horizontal roller, 21: vertical support member, 22: cutting torch, 23 coil spring (first elastic member), 24: lower support frame, 25: upper support Frame: 26: auxiliary support member, 27: second horizontal roller, 28: coil spring (second elastic member), 29: clamp body, 30: slide rod, 31: slide clamp body, 32: slide hole, 33: Block for slide, 34: insertion part, 35: mounting hole, 36: fixing bolt, 37: female screw, 38: tip, 39: outer surface, 40: clamp bolt, 41: bar for rotation, 42: female 43: tip, 44: lower surface, 45: clamp bolt, 46: upper end surface, 47: outer periphery, 48: inner periphery, 49: outer periphery, 50: inner periphery, 51: outer ring roller, 52: inner ring Roller, 53, 54: Cart, 55: Lower surface, 56: Upper frame plate, 57: Spacer member, 58: Lower frame plate, 59: Cart frame, 60, 60a: Fixed shaft, 61: Mounting hole, 62, 63: Mounting plate, 64, 65: Vertical member, 66: Connecting member, 67: Mounting bracket, 68: Pin, 69: Torch rail, 70: Torch head, 71: Gasoline supply pipe, 72: Oxygen gas supply pipe, 73, 74 : Pipe holder, 75: Fitting bracket, 76, 77: Lifting guide roller, 78: Bracket, 79: Mounting arm, 80: Base plate, 81: Spring mounting bracket, 82: Pin , 83: joint member, 84: hook, 85: urging force adjusting bolt, 86, 87: nut, 88: base plate, 89: spring mounting bracket, 90: screw joint member, 91: hook, 92, 93: nut, 94: Bolt for adjusting urging force, 95, 96: Nut, 97: Holder stopper

Claims (5)

A ring-shaped guide material provided substantially concentrically with the steel pipe pile at a position above the pipe end of the steel pipe pile via a plurality of steel pipe clamps that can be fixed to the upper end of the steel pipe pile;
A revolving frame comprising a slide rail provided across the guide material, and capable of revolving the guide material;
A support frame movable along the slide rail;
A vertical support member provided with an upper part attached to the support frame, a lower part comprising a first horizontal roller contacting the inner surface of the steel pipe pile, and extending downward from the support frame;
A cutting torch attached to the vertical support member so as to be vertically adjustable;
A steel pipe pile cutting device comprising: a first elastic member having one end fixed to the support frame, the other end attached to the revolving frame, and biasing the support frame radially outward. The steel pipe pile cutting device according to claim 1, wherein the support frame is attached to the slide rail, and an upper part is attached to the lower support frame so as to be rotatable and fixed to an upper side of the vertical support member. The cutting torch is rotatably attached to the upper portion of the upper support frame via an auxiliary support member, and is provided on the lower portion of the auxiliary support member or the cutting torch. A steel pipe pile cutting device, wherein a second elastic member for urging the second horizontal roller toward the inner surface of the steel pipe pile is provided between the upper part of the auxiliary support member and the upper support frame. . The steel pipe pile cutting device according to any one of claims 1 and 2, wherein gasoline is used as fuel for the cutting torch. The steel pipe pile cutting device according to any one of claims 1 to 3, wherein the steel pipe clamp is arranged in a radial direction from a clamp body disposed at intervals in a circumferential direction of an upper end portion of the steel pipe pile and the clamp body. A slide clamp body having a slide rod projecting horizontally outward, and a slide block provided at a lower end of the guide material and having a slide hole through which the slide rod of the slide clamp body is inserted. A steel pipe pile cutting device. The steel pipe pile cutting device according to any one of claims 1 to 4, wherein the swivel frame includes two outer ring rollers with two flanges that roll around an outer periphery of the guide member and the guide member. The inner ring roller with a pair of ribs that rolls across the inner periphery of the guide member is movable along the circumferential direction of the guide member and is connected by the slide rail through the center of the guide member. A steel pipe pile cutting device comprising two trucks.

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