JP6352700B2 - Steel pipe cutting equipment - Google Patents

Description

  The present invention relates to a steel pipe cutting device.

  Conventionally, steel pipes have been used as foundation piles used in building foundation work. Currently, the technology of cutting steel pipes placed in a substantially vertical direction for the purpose of equalizing the height of steel pipe foundation piles or cutting at a certain depth instead of removing existing steel pipe foundation piles Various proposals have been made.

  For example, a suspension member fixed at a predetermined position in a steel pipe foundation pile for construction by a fixing member and a pressure contact member, and loosely fitted in a central part of the suspension member so as to be freely rotatable and driven by a rotational drive source. A rotating member that rotates at the top of the rotating member, a holding member that is fixed to the tip of the rotating member via an elastic member and moves in contact with the inner surface of the steel pipe foundation pile for construction, and a steel pipe foundation pile for construction that is held by the holding member A steel pipe cutting device having an air plasma generation torch facing the inner surface of the steel pipe has been proposed (see Patent Document 1).

  Further, in recent years, a ring-shaped guide member provided at the end of the steel pipe pile pipe, a revolving frame that has a slide rail provided across the guide member and can turn the guide member, and along the slide rail A movable support frame; a vertical support member having an upper part attached to the support frame and having a first horizontal roller at the lower part contacting the inner surface of the steel pipe pile; and extending downward from the support frame; A steel pipe cutting having a cutting torch attached to the member so as to be vertically adjustable, 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 An apparatus has been proposed (see Patent Document 2).

Japanese Utility Model Publication No. 06-19626 JP 2007-303097 A

  Each of the techniques described in Patent Documents 1 and 2 described above is intended to insert a steel pipe cutting means inside the steel pipe to cut the steel pipe from the inside, but has the following problems. .

  That is, in the technique described in Patent Document 1, it is necessary to separately prepare a means for suspending the suspension member in the vicinity of the steel pipe. In addition, it is necessary to incorporate a fixing member, a pressure contact member, a rotational drive source, and the like in the suspension member, and there is a problem that the member becomes expensive and the size of the member becomes large and is not suitable for cutting a small-diameter steel pipe. In the technique described in Patent Document 2, since the elastic member that urges the support frame radially outward is disposed at the steel pipe end, when the steel pipe cutting position is away from the pipe end, There is a problem that it is difficult to bring the cutting torch into contact with the inner surface of the steel pipe.

  The present invention has been made in view of such circumstances, and it is possible to cut a small-diameter steel pipe without using a suspending means, and to cut the steel pipe cutting means easily even if the steel pipe cutting position is away from the pipe end. An object of the present invention is to provide a steel pipe cutting device capable of contacting the inside of a steel pipe.

  In order to achieve the above object, a steel pipe cutting device according to the present invention includes an annular member attached to an upper end portion of a steel pipe, a turning member attached to the annular member so as to turn on the annular member, and at least a part of the inside of the steel pipe. A shaft member attached to the swivel member in a state of being inserted into the steel member, and a steel pipe cutting means attached to an end of a portion inserted into the steel pipe of the shaft member, and inserted into the steel pipe of the shaft member The portion to be bent is configured to bend through at least one shaft portion and maintain the bent state.

  When this configuration is adopted, an annular member is attached to the upper end portion of the steel pipe, a turning member is attached to the annular member, a shaft member is attached to the turning member, and an end of a portion of the shaft member that is inserted into the steel pipe. Since the steel pipe cutting means is attached to the part, there is no need to separately provide means (rope or the like) for suspending the steel pipe cutting means. Further, since only a relatively simple configuration (a part of the shaft member and the steel pipe cutting means) is inserted into the steel pipe, the small diameter steel pipe can be cut. Furthermore, since the portion inserted into the steel pipe of the shaft member is configured to bend and maintain the bent state via at least one shaft portion, the steel pipe cutting position is separated from the upper end of the steel pipe. Even in this case, the steel pipe cutting means can be easily brought close to the inner surface of the steel pipe.

  In the steel pipe cutting device according to the present invention, the bent state of the portion inserted into the steel pipe of the shaft member can be maintained by an elastic body provided in the vicinity of the shaft portion.

  When such a configuration is employed, the bent state of the portion inserted into the steel pipe of the shaft member can be maintained by a relatively simple configuration (an elastic body provided in the vicinity of the shaft portion).

  In the steel pipe cutting device according to the present invention, the elastic body can be made of a heat-resistant material (for example, a metal material).

  When such a configuration is adopted, since the elastic body is made of a heat-resistant material (for example, a metal material), it is possible to use a steel pipe cutting means that generates heat.

  In the steel pipe cutting device according to the present invention, a guide member for contacting the inner surface of the steel pipe and maintaining the dimension between the inner surface of the steel pipe and the steel pipe cutting means at a constant value can be provided in the vicinity of the steel pipe cutting means. .

  When such a configuration is adopted, a guide member for contacting the inner surface of the steel pipe and maintaining the dimension between the inner surface of the steel pipe and the steel pipe cutting means at a constant value is provided in the vicinity of the steel pipe cutting means. Steel pipes can be cut.

  In the steel pipe cutting device according to the present invention, the length of the portion inserted into the steel pipe of the shaft member can be changed.

  When this configuration is adopted, the length of the portion inserted into the steel pipe of the shaft member can be changed, so that the steel pipe cutting position can be changed as appropriate.

  In the steel pipe cutting device according to the present invention, a scale for grasping the length of the portion inserted into the steel pipe can be provided on the shaft member.

  If this structure is employ | adopted, the length (as a result, steel pipe cutting position) of the part inserted in a steel pipe can be grasped | ascertained with the scale provided in the shaft member.

  In the steel pipe cutting device according to the present invention, the mounting angle of the annular member with respect to the steel pipe can be changed.

  When such a configuration is adopted, the angle of attachment of the annular member to the steel pipe can be changed, so that the angle of the steel pipe cut surface can be changed as appropriate.

  In the steel pipe cutting device according to the present invention, an air plasma cutting device can be adopted as the steel pipe cutting means.

  Thus, since the air plasma cutting device is adopted as the steel pipe cutting means, it is possible to cut a relatively low temperature steel pipe in the soil well.

  According to the present invention, a steel pipe that does not require a suspension means, is inexpensive, can cut a small-diameter steel pipe, and can easily abut the steel pipe cutting means inside the steel pipe even when the steel pipe cutting position is away from the pipe end. A cutting device can be provided.

It is explanatory drawing for demonstrating the whole structure of the steel pipe cutting device which concerns on embodiment of this invention. It is explanatory drawing for demonstrating the modification of the shaft member of the steel pipe cutting device which concerns on embodiment of this invention. It is explanatory drawing for demonstrating the other modification of the shaft member of the steel pipe cutting device which concerns on embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, the following embodiment is a suitable application example to the last, Comprising: The application range of this invention is not limited to this.

  First, the structure of the steel pipe cutting device 1 which concerns on embodiment of this invention is demonstrated using FIG. The steel pipe cutting device 1 according to the present embodiment includes an annular member 10 attached to the upper end portion 101 of the steel pipe 100, a turning member 20 attached to the annular member 10, a shaft member 30 attached to the turning member 20, and the steel pipe 100. Steel pipe cutting means 40 for cutting from the inside.

  The annular member 10 is fixed to the upper end 101 of the steel pipe 100 via bolts 11 and the like. The annular member 10 only needs to be fixable to the upper end portion 101 of the steel pipe 100, and the planar shape thereof is not necessarily exactly the same as the planar shape of the steel pipe 100, but may be the same as the planar shape of the steel pipe 100. preferable. For example, when the planar shape of the steel pipe 100 is a circular shape, the annular member 10 having a circular shape in a plan view is adopted, and when the planar shape of the steel pipe 100 is a polygonal shape, the annular member 10 having a polygonal shape in a plan view. To adopt. The annular member 10 has a guide portion 12 for placing and turning a roller 21 (described later) of the turning member 20. The guide part 12 is configured to have a circular shape in plan view.

  In the present embodiment, as shown in FIG. 1, the annular member 10 having an inner diameter slightly larger than the outer diameter of the steel pipe 100 is covered from the upper part of the upper end portion 101 of the steel pipe 100, and the annular member 10 is externally attached with bolts 11. Although the example which fixed this to the steel pipe 100 was shown, the form of the annular member 10 is not restricted to this. For example, an annular member having an outer diameter slightly smaller than the inner diameter of the steel pipe 100 can be inserted from the upper end portion 101 of the steel pipe 100 and the annular member can be fixed to the steel pipe 100 with a bolt from the inside. In such a case, the annular member is positioned slightly below the upper end 101 of the steel pipe 100, but it is preferable to fix it near the upper end 101 because it is easier to handle. In the present invention, the “upper end portion” of the steel pipe includes not only the upper portion of the upper end portion 101 of the steel pipe 100 but also a position slightly below the upper end portion 101.

  The turning member 20 is attached to the guide portion 12 of the annular member 10 via a roller 21 so as to turn on the annular member 10. A portion of the turning member 10 that is fitted into the guide portion 12 of the annular member 10 has a circular shape in plan view. The annular member 10 and the turning member 20 can be made of a metal material or the like.

  As shown in FIG. 1, the shaft member 30 is fixed to the turning member 20 via bolts 22 and the like with a part thereof being inserted into the steel pipe 100. The shaft member 30 can also be made of a metal material or the like. In the present embodiment, the shaft member 30 is arranged in the vicinity of the turning center axis of the turning member 10, but the shaft member 30 may be arranged at a position slightly deviated from the turning center axis.

  The length of a portion (hereinafter referred to as “steel pipe internal portion”) 31 inserted into the steel pipe 100 of the shaft member 30 can be changed. Thereby, a steel pipe cutting position can be changed suitably. The shaft member 30 can also be provided with a scale for grasping the length of the steel pipe inner portion 31. By doing in this way, the length (as a result, steel pipe cutting position) of the part inserted in steel pipe 100 can be grasped.

  As shown in FIG. 1, the steel pipe inner portion 31 in the present embodiment is divided into three portions (a first portion 31A, a second portion 31B, and a third portion 31C), and the first portion 31A. And the second part 31B are connected to each other by a first hinge part (shaft part) 32A so as to be rotatable (bendable), and the second part 31A and the third part 31C are connected to the second hinge part (shaft part). It is connected so that it can rotate (bend) at 32B. That is, the steel pipe inner portion 31 is configured to be bent through two hinge portions (shaft portions) 32A and 32B.

  An elastic body 33 is provided in the vicinity of the first hinge portion 32A. The elastic body 33 rotates (folds) the second portion 31B with respect to the first portion 31A of the steel pipe inner portion 31. Forces to act are acting. That is, the bent portion of the steel pipe inner portion 31 is maintained by the elastic body 33, whereby the steel pipe cutting means 40 is pressed against the inner surface 102 of the steel pipe 100. The elastic body 33 in this embodiment is comprised with the metal material which has heat resistance. For this reason, it becomes possible to use the steel pipe cutting means 40 which emits heat.

  On the other hand, the second hinge portion 32B has the third portion 31C with respect to the second portion 31B in a state where the angle of the third portion 31C with respect to the second portion 31B of the steel pipe inner portion 31 is set to a desired value. Means (bolts or the like) for preventing rotation (bending) are provided.

  The steel pipe cutting means 40 cuts the steel pipe 100 from the inside using gas, electricity, air or the like supplied from a supply device 50 provided outside through the pipe 51, and the end of the steel pipe inner portion 31. It is attached to 31D. As the steel pipe cutting means 40, a gas cutting device, an air plasma cutting device or the like can be employed. In particular, when an air plasma cutting device is employed as the steel pipe cutting means 40, a relatively low temperature steel pipe in the soil can be cut well.

  In the vicinity of the steel pipe cutting means 40, as shown in FIG. 1, a guide member for contacting the inner surface 102 of the steel pipe 100 and maintaining the dimension between the inner surface 102 of the steel pipe 100 and the steel pipe cutting means 40 at a constant value. 60 is provided. Thereby, the steel pipe 100 can be cut with high accuracy.

  In the steel pipe cutting device 1 according to the embodiment described above, the annular member 10 is attached to the upper end portion 101 of the steel pipe 100, the turning member 20 is attached to the annular member 10, and the shaft member 30 is attached to the turning member 20. Since the steel pipe cutting means 40 is attached to the end 31D of the steel pipe inner portion 31 of the shaft member 30, it is not necessary to separately provide means (such as a rope) for suspending the steel pipe cutting means 40. Moreover, since only a comparatively simple structure (a part of shaft member 30 and the steel pipe cutting means 40) is inserted into the steel pipe 100, the small diameter steel pipe can be cut. Further, the steel pipe inner portion 31 of the shaft member 30 is configured to bend via hinge portions (shaft portions) 32A and 32B, and the elastic body 33 provided in the vicinity of the hinge portion 32A allows the steel pipe inner portion 31 to be bent. Since it is configured to maintain the bent state, the steel pipe cutting means 40 can be easily brought close to the inner surface 102 of the steel pipe 100 even if the steel pipe cutting position is away from the upper end of the steel pipe 100.

  Moreover, in the steel pipe cutting device 1 which concerns on embodiment described above, since the elastic body is comprised with the material (metal material) which has heat resistance, it becomes possible to use the steel pipe cutting means 40 which emits heat. .

  Moreover, in the steel pipe cutting device 1 according to the embodiment described above, the guide member for contacting the inner surface 102 of the steel pipe 100 and maintaining the dimension between the inner surface 102 of the steel pipe 100 and the steel pipe cutting means 40 at a constant value. Since 60 is provided in the vicinity of the steel pipe cutting means 40, the steel pipe can be cut with high accuracy.

  Moreover, in the steel pipe cutting device 1 which concerns on embodiment described above, since the length of the steel pipe inner part 31 of the shaft member 30 can be changed, the steel pipe cutting position can be changed suitably.

  In the above embodiment, the steel pipe inner part 31 of the shaft member 30 is divided into three parts and these three parts are connected via two hinge parts (shaft parts). The configuration is not limited to this. For example, as shown in FIG. 2, the steel pipe inner portion 31 is composed of two portions (first portion 31A and second portion 31B), and the first portion 31A and the second portion 31B are one hinge portion. (Shaft part) 32A is rotatably connected, and an elastic body 33 is provided in the vicinity of the hinge part 32A. With this elastic body 33, the second part 31B is connected to the first part 31A of the steel pipe inner part 31. A force that causes rotation (folding) may be applied. Even if such a configuration is adopted, the steel pipe cutting means 40 can be pressed against the inner surface 102 of the steel pipe 100. That is, one hinge part (shaft part) may be sufficient and the elastic body should just be provided in the vicinity of this hinge part (shaft part). By adopting the configuration as shown in FIG. 2, it is possible to reduce the number of components of the steel pipe inner portion 31 and the number of hinge portions, and thus it is possible to reduce manufacturing costs (material costs).

  Moreover, in the above embodiment, the steel pipe inner part 31 of the shaft member 30 is divided into three parts, these three parts are connected via two hinge parts (shaft parts), and one hinge part (first hinge) Although an example in which an elastic body is provided only in the vicinity of the portion 32A) is shown, the number of elastic bodies is not limited to this. For example, as shown in FIG. 3, elastic bodies 33A and 33B may be provided in the vicinity of the two hinge portions (the first hinge portion 32A and the second hinge portion 32B), respectively. If such a structure is employ | adopted, it will become possible to press the steel pipe cutting means 40 on the inner surface of a steel pipe also with a large diameter steel pipe.

  Moreover, in the above embodiment, although the example which showed the annular member 10 arrange | positioning to the horizontal direction with respect to the steel pipe 100 arrange | positioned to the perpendicular direction was shown, the attachment angle with respect to the steel pipe 100 of the annular member 10 is changed. May be. If it does in this way, the angle of a steel pipe cutting surface can be changed suitably.

  Moreover, in the above embodiment, as shown in FIGS. 1-3, an elastic body is provided "inside" the hinge part (shaft part), and the steel pipe inner part is rotated (bent) by the tensile force of the elastic body. Although an example is shown, an elastic body may be provided on the “outside” of the hinge part, and the inner portion of the steel pipe may be rotated (bent) by the pressing force of the elastic body. Further, an elastic body can be provided on both “inside” and “outside” of the hinge part, or an elastic body can be built in “inside” of the hinge part.

  Moreover, in the above embodiment, although the example which maintained the bending state of the steel pipe inner part by using an elastic body in the vicinity of a hinge part (shaft part) was shown, the steel pipe inner part using other means was shown. The bent state can be maintained. For example, an actuator is built in the hinge part (shaft part), and a control signal is given to this actuator via a wired or wireless communication means to actuate the actuator to bend the inner part of the steel pipe. The state may be maintained.

  The present invention is not limited to the above-described embodiment, and those in which those skilled in the art appropriately modify the design are included in the scope of the present invention as long as they have the features of the present invention. . That is, each element provided in the embodiment and its arrangement, material, condition, shape, size, and the like are not limited to those illustrated, but can be appropriately changed (for example, the male and female spline joints are switched upside down. Is possible). Moreover, each element with which the said embodiment is provided can be combined as much as technically possible, and the combination of these is also included in the scope of the present invention as long as it includes the features of the present invention.

  As an application example of the present invention, it can be suitably used as an apparatus for cutting a steel pipe from the inside.

DESCRIPTION OF SYMBOLS 1 ... Steel pipe cutting device 10 ... Ring member 20 ... Turning member 30 ... Shaft member 31 ... Steel pipe inner part (part inserted in a steel pipe)
31D: End of steel pipe inner portion 32A: Hinge (shaft)
32B ... Hinge (shaft)
33 · 33A · 33B ... elastic body 40 ... steel pipe cutting means 60 ... guide member 100 ... steel pipe 101 ... upper end portion of steel pipe 102 ... inner surface of steel pipe

Claims (8)

An annular member attached to the upper end of the steel pipe, a turning member attached to the annular member so as to turn on the annular member, and a shaft attached to the turning member in a state where at least a part thereof is inserted into the steel pipe A steel pipe cutting device comprising: a member; and a steel pipe cutting means attached to an end of a portion of the shaft member inserted into the steel pipe,
The portion inserted into the steel pipe of the shaft member is configured to bend through at least one shaft portion and maintain the bent state by an elastic body provided in the vicinity of the shaft portion . Steel pipe cutting device. The elastic body is made of a material having heat resistance, the steel pipe cutting apparatus of claim 1. The steel pipe cutting device according to claim 1 or 2 , wherein the elastic body is made of a metal material. The guide member for contacting the inner surface of the steel pipe and maintaining the dimension between the inner surface of the steel pipe and the steel pipe cutting means at a constant value is provided in the vicinity of the steel pipe cutting means. The steel pipe cutting device according to any one of 3 . The length of the part inserted in the said steel pipe of the said shaft member is a steel pipe cutting device as described in any one of Claim 1 to 4 which can be changed. The steel pipe cutting device according to claim 5 , wherein the shaft member is provided with a scale for grasping a length of a portion inserted into the steel pipe. The steel pipe cutting device according to any one of claims 1 to 6 , wherein an attachment angle of the annular member with respect to the steel pipe is changeable. The steel pipe cutting device according to any one of claims 1 to 7 , wherein the steel pipe cutting means is an air plasma cutting device.

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