JP6253993B2 - Steel frame dismantling method - Google Patents

Description

  The present invention relates to a method for dismantling a steel frame.

  A concrete plate (PC plate) that is attached to a steel frame composed of a steel column and a steel beam and forms an outer wall of the structure is known (for example, see Patent Document 1). As a method for dismantling this type of steel frame, a method is known in which both ends of a steel beam are cut and the cut steel beam is lifted and removed by a crane (for example, see Patent Document 2).

JP 2004-225388 A JP 2012-1902 A

  By the way, as another method for dismantling the steel frame as described above, it is conceivable that the concrete plate is first removed from the steel column and the steel beam, and then the steel frame is defeated by a heavy machine. However, it takes time to remove the concrete plate.

  In view of the above facts, the present invention aims to reduce the labor of removing the concrete plate.

  The method for disassembling a steel frame according to claim 1 includes a bundling step of bundling a steel frame formed of a steel column and a steel beam and a concrete plate attached to the steel frame, and the concrete plate is bundled And a frame collapse process of defeating the steel frame by a heavy machine.

  According to the method for dismantling a steel frame according to claim 1, the steel frame and the concrete plate are bundled in the bundling step. Next, in the frame collapse process, the steel frame with the concrete plates bound together is collapsed by a heavy machine. As a result, the concrete plate can be removed from the steel frame while the steel frame is tilted down. Therefore, the trouble of removing the concrete plate can be reduced.

  The method for disassembling a steel frame according to claim 2 is the method for disassembling a steel frame according to claim 1, wherein the concrete plate forms an outer wall, and in the frame collapse step, the steel frame is structured by the heavy machinery. Defeat inside.

  According to the method for dismantling a steel frame according to claim 2, in the frame collapse step, the steel frame to which the concrete plate forming the outer wall is attached is tilted to the inside of the structure by a heavy machine. As a result, the concrete plate forming the outer wall can be easily removed from the steel frame.

  The method for disassembling a steel frame according to claim 3 is the method for disassembling a steel frame according to claim 1, wherein the concrete plate is interposed between the steel frame and a scaffold temporarily provided opposite to the steel frame. In the frame collapse step, the steel frame is tilted to the opposite side of the scaffold by the heavy machinery.

  According to the method for dismantling a steel frame according to claim 3, the concrete plate is located between the steel frame and the scaffold. In this case, in a state where the steel frame is left standing, there is a possibility that the scaffold becomes an obstacle and the concrete plate cannot be removed from the steel frame.

  On the other hand, in the present invention, in the frame collapse process, the steel frame in which the concrete plates are bound is collapsed to the opposite side of the scaffold by a heavy machine. Thereby, the concrete plate can be easily removed from the steel frame.

  As described above, according to the steel frame disassembling method according to the present invention, it is possible to reduce the labor of removing the concrete plate.

It is a longitudinal cross-sectional view which shows the steel frame in one Embodiment of this invention. (A) is the elements on larger scale of FIG. 1 which show a steel beam, (B) is the 2B-2B sectional view taken on the line of FIG. It is a longitudinal cross-sectional view corresponding to FIG. 1 which shows the state which bound the concrete plate for columns, and the concrete plate for beams to the steel column and the steel beam, respectively. It is a longitudinal cross-sectional view corresponding to FIG. 1 explaining the burning method of the column base part of a steel column. FIG. 5 is a side view showing a state in which the column base portion of the steel column shown in FIG. 4 is fired. It is a longitudinal cross-sectional view corresponding to FIG. 1 which shows the state which fell the steel frame by the heavy machine.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In each drawing, an arrow IN appropriately shown indicates the inside of the structure, and an arrow OUT indicates the outside of the structure.

  First, the structure of the steel frame will be described.

  As shown in FIG. 1, the steel frame 12 is an outer frame arranged along the outer periphery of the structure 10. The steel frame 12 includes a pair of steel columns 14 and a steel beam 16 installed on the pair of steel columns 14.

  In addition, a scaffold 20 such as a frame scaffold facing the steel frame 12 is temporarily provided on the outside of the steel frame 12. The scaffold 20 is provided with a shielding panel 22 that shields noise and dust associated with the dismantling work.

  As shown in FIG. 2 (B), the steel column 14 is made of H-shaped steel, and has a pair of left and right flange portions 14A and a web portion 14B that connects the pair of left and right flange portions 14A. Yes.

  Similarly, as shown in FIG. 2A, the steel beam 16 is formed of H-shaped steel, and a pair of upper and lower flange portions 16A and a web portion 16B connecting the pair of upper and lower flange portions 16A. And have. Note that the steel column 14 and the steel beam 16 are not limited to the H-shaped steel, and can be formed of various shaped steels and steel pipes.

  Here, a column PC plate 30 and a beam PC plate 36 as examples of a concrete plate (hereinafter referred to as a “PC plate”) are attached to the steel column 14 and the steel beam 16, respectively.

  As shown in FIG. 2 (B), the column PC plate 30 is formed in a C-shaped cross section having an opening opposite to the scaffold 20 (see FIG. 1), and the steel column 14 is disposed therein. ing. The column PC plate 30 includes a side wall portion (outer wall portion) 30A disposed outside the steel column 14, and a pair of side wall portions 30B extending from both end portions in the width direction of the side wall portion 30A to both sides of the steel column 14. have.

  The outer side wall portion 30 </ b> A is located between the steel column 14 and the scaffold 20 and forms the outer wall of the structure 10. The pair of side wall portions 30 </ b> B extends from the side wall portion 30 </ b> A to the opposite side of the scaffold 20, is disposed on both sides of the steel column 14, and faces each other across the steel column 14. An inner PC plate 34 that closes the opening 32 of the column PC plate 30 is disposed inside the steel column 14, but the inner PC plate 34 may be omitted as appropriate.

  As shown in FIG. 2A, the beam PC plate 36 has an L-shaped cross section. This PC plate 36 for beams has a side wall part (outer wall part) 36A arranged outside the steel beam 16, and a lower wall part 36B extending from the lower end part of the side wall part 36A to the lower side of the steel beam 16. doing.

  The outer side wall portion 36 </ b> A is located between the steel beam 16 and the scaffold 20 and forms the outer wall of the structure 10. The lower wall portion 36 </ b> B extends from the side wall portion 36 </ b> A to the side opposite to the scaffold 20 and is disposed below the steel beam 16. Note that the end of the slab 18 is placed on the upper side of the steel beam 16.

  Next, an example of a method for dismantling the steel frame will be described.

  First, the bundling process will be described. In the binding step, as shown in FIG. 3, the steel frame 12, the column PC plate 30, and the beam PC plate 36 are bound by wire rods 40 and 42 such as wire ropes.

  Specifically, the wire 40 is wound around the column PC plate 30 and the inner PC plate 34, and the wire 40 is tightened by a tightening device 44 such as a lever block (registered trademark). As a result, the steel column 14 and the column PC plate 30 and the inner PC plate 34 are firmly bound (secured).

  Similarly, the wire 42 is wound around the beam PC plate 36 and the wire 42 is tightened by the tightening device 44. Thereby, the steel beam 16 and the beam PC plate 36 are firmly bound (secured). In addition, the number and arrangement | positioning of the wire 40 and 42 can be changed suitably.

  Next, the column base part dismantling process will be described. In the column base part disassembling process, the inner side PC plate 34 and the side wall parts of the column PC plate 30 that cover the column base part of the steel column 14 by the gripping tool 54 such as a movable fork provided at the tip of the arm 52 of the heavy machine 50. The lower part of 30B is destroyed and removed, and the column base part of the steel column 14 is exposed.

  Next, as shown in FIG. 4, the column base of the steel column 14 is fired prior to the steel column 14 to easily fall down to the inside of the structure 10 (the side opposite to the scaffold 20). Specifically, as shown in FIG. 5, notches 56 are respectively formed in the end portions 14 </ b> A <b> 1 inside the structure 10 in the pair of left and right flange portions 14 </ b> A in the column base portions of the steel column 14. In addition, the formation method of the notch 56 with respect to a left-right paired flange part 14A can be changed suitably.

  Next, the frame collapse process will be described. As shown in FIG. 6, after the steel beam 16 and the beam PC plate 36 bound by the wire 42 are gripped by the gripping tool 54 of the heavy machine 50, the column base portion of the steel column 14 is further fired, The legs are pulled into the inside of the structure 10 with the legs cut or substantially cut. As a result, the pair of steel columns 14 falls to the inside of the structure 10 with the notch 56 formed in the column base as a fulcrum. That is, the steel frame 12 falls to the inside of the structure 10.

  In addition, the site | part which hold | grips the steel frame 12 with the heavy machine 50 can be changed suitably, for example, you may hold | grip the steel column 14 with which the PC plate 30 for pillars and the inner side PC plate 34 were bound. Further, the steel frame 12 may be held simultaneously by a plurality of heavy machines 50.

  Next, in the PC plate removing step, the column PC plate 30, the inner PC plate 34, and the beam PC plate 36 are removed from the collapsed steel frame 12, respectively. Thereafter, the steel column 14 and the steel beam 16 are cut and the steel frame 12 is disassembled.

  Next, the effect of this embodiment will be described.

  According to the method for dismantling a steel frame according to the present embodiment, in the bundling process, the steel column 14 and the column PC plate 30 and the inner PC plate 34 are bound by the wire 40, and the steel beam 16 and the beam PC plate 36 are combined. Are bound by the wire 42. Then, in the frame collapse process, the steel frame 12 in which the column PC plate 30, the inner PC plate 34, and the beam PC plate 36 are bound is collapsed to the inner side of the structure 10 (the side opposite to the scaffold 20) by the heavy machine 50. .

  Here, a scaffold 20 is temporarily provided outside the column PC plate 30. Therefore, it is difficult to remove the column PC plate 30 from the steel column 14 because the scaffold 20 becomes an obstacle. Further, the column PC plate 30 is formed in a C-shaped cross section having an opening on the opposite side to the scaffold 20, and a pair of side wall portions 30 </ b> B (see FIG. 2B) wraps around both sides of the steel column 14. It is out. Therefore, since the pair of side wall portions 30 </ b> B are caught by the steel column 14 and the steel beam 16, it is difficult to pull out the column PC plate 30 in the vertical direction and the horizontal direction from the gap between the steel column 14 and the scaffold 20.

  Similarly, a scaffold 20 is temporarily provided outside the beam PC plate 36. Therefore, the scaffold 20 becomes an obstacle, and it is difficult to remove the beam PC plate 36 from the steel beam 16. Furthermore, the beam PC plate 36 has an L-shaped cross section, and the lower wall portion 36 </ b> B wraps around the lower side of the steel beam 16. Therefore, since the lower wall portion 36B of the beam PC plate 36 is caught by the steel beam 16, it is difficult to pull out the beam PC plate 36 in the vertical direction from the gap between the steel beam 16 and the scaffold 20.

  As a countermeasure, it is conceivable to remove the scaffold 20 prior to the dismantling of the steel frame 12. However, the shielding panel 22 is attached to the scaffold 20. Therefore, when the scaffold 20 is removed, the shielding panel 22 is also removed at the same time, so that noise and dust may become a problem when the steel frame 12 is disassembled.

  On the other hand, in the present embodiment, as described above, the steel frame 12 in which the column PC plate 30 and the beam PC plate 36 are bound is collapsed by the heavy machine 50 in the frame collapse process. Accordingly, the column PC plate 30 and the beam PC plate 36 can be respectively removed from the steel column 14 and the steel beam 16 in a state where the steel frame 12 is tilted down. Therefore, it is possible to reduce the trouble of removing the column PC plate 30 and the beam PC plate 36.

  As described above, this embodiment is particularly effective when the column PC plate 30 and the beam PC plate 36 have shapes that are difficult to remove from the steel column 14 and the steel beam 16 (for example, a C-shaped section or an L-shaped section). It is.

  In addition, in this embodiment, since the scaffold 20 is not removed prior to the frame collapse step, noise, dust and the like associated with the dismantling of the steel frame 12 can be shielded by the shielding panel 22.

  Next, a modification of the above embodiment will be described.

  In the above embodiment, an example in which the column PC plate 30, the inner PC plate 34, and the beam PC plate 36 are attached to the steel frame 12 is shown, but the present invention is not limited to this. It suffices that at least one of the column PC plate 30 and the beam PC plate 36 is attached to the steel frame 12.

  Moreover, in the said embodiment, although the PC plate 30 for pillars and the PC plate 36 for beams formed the outer wall of the structure 10, the example was not restricted. The column PC plate 30 and the beam PC plate 36 may be, for example, a finishing material for the steel column 14 or the steel beam 16.

  The shapes of the column PC plate 30 and the beam PC plate 36 are not limited to those described above. The shapes of the column PC plate 30 and the beam PC plate 36 can be changed as appropriate, and may be, for example, an L-shaped section, a C-shaped section, or a flat plate shape.

  Moreover, although the example which fell the steel frame 12 provided in the outer peripheral part of the structure 10 was shown in the said embodiment, it is not restricted to this. The above embodiment is also applicable to a steel frame provided inside the structure 10. In addition, the above embodiment is effective as a method for dismantling the steel frame facing the scaffold regardless of whether it is the outer peripheral portion or the inside of the structure 10.

  Furthermore, although the steel frame 12, the PC plate 30 for pillars, and the PC plate 36 for beams were bound with wire rods 40 and 42 (bundling members) such as wire ropes in the above embodiment, the present invention is not limited to this. The method for binding the steel frame 12 to the column PC plate 30 and the beam PC plate 36 may be, for example, a method of combining steel materials such as angles and binding them with bolts (binding members).

  As mentioned above, although one embodiment of the present invention was described, the present invention is not limited to such an embodiment, and one embodiment and various modifications may be used in combination as appropriate, and the gist of the present invention will be described. Of course, various embodiments can be implemented without departing from the scope.

DESCRIPTION OF SYMBOLS 10 Structure 12 Steel frame 14 Steel column 16 Steel beam 20 Scaffold 30 Concrete plate for column 36 Concrete plate for beam 50 Heavy machinery

Claims (3)

A bundling step of bundling a steel frame formed of a steel column and a steel beam and a concrete plate attached to the steel frame;
A frame collapse process of defeating the steel frame to which the concrete plate is bound with a heavy machine;
A method for dismantling a steel frame. The concrete plate forms an outer wall;
In the frame collapse process, the steel frame is collapsed to the inside of the structure by the heavy machinery.
The method for disassembling a steel frame according to claim 1. The concrete plate is positioned between the steel frame and a scaffold temporarily provided opposite the steel frame;
In the frame collapse step, the steel frame is collapsed to the opposite side of the scaffold by the heavy machinery,
The method for disassembling a steel frame according to claim 1.

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