JP3971858B2 - Demolition method for tower structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tower-like structure, particularly a chimney dismantling method.
[0002]
[Prior art]
Tower-like structures, especially chimney demolition methods, have a temporary scaffold installed on the upper part of the chimney to be demolished, and then the worker cuts and disassembles the chimney with a hand breaker and drops it into the interior, and then descends the scaffold sequentially. , Dismantling work. Also, it is known to dismantle the chimney sequentially from the top of the chimney by providing a deck that hangs the nippler and turns by temporarily providing a support material at the top of the chimney and providing a scaffolding inside the chimney Yes.
However, the above-described conventional technology lacks the safety of workers because a temporary scaffold is provided or work is performed at a high place.
For this reason, various methods have been studied for dismantling the tower structure, particularly the chimney.
Japanese Patent Laid-Open No. 6-17543 discloses a chimney dismantling method.
The dismantling device is composed of a chimney elevating part and a cutting and dismantling part.
The chimney raising / lowering unit includes upper and lower fixtures fixed to the chimney, attachment / detachment means for fixing and releasing the fixture, and expansion / contraction means for extending and contracting between the two fixtures. The cutting and disassembling unit includes a cutting stage that turns on the main body stage, and a vertical cutting cutter and a horizontal cutting cutter that are on the stage. When using the dismantling apparatus, the apparatus is moved up and down by the expansion / contraction means of the chimney lifting section. After this device is positioned at the top of the chimney, the vertical cutting cutter is lowered by the vertical rotation means to provide the vertical cut from the chimney end, and the horizontal cutting cutter is provided by the horizontal cutting cutter by the advance and retreat means, and the first block group Is dropped into the chimney, and further, a vertical cut is made at the dropped part by a vertical cutting cutter, and the remaining second block group adjacent to the dropped first block group is cut into the chimney circumferential direction. Cut by inserting. And it cuts down sequentially and dismantles.
According to the above chimney demolition method, it is possible to dismantle by remote operation without requiring a temporary scaffold.
[0003]
[Problems to be solved by the invention]
However, the technique disclosed in JP-A-6-17543 has the following problems.
When the dismantling device as described above is positioned at the top of the large chimney, it is difficult to prepare. In the case of cutting, the upper and lower fixtures are alternately fixed and released, and the longitudinal cutting is performed. Since the block group is cut by a cutter and a horizontal cutting cutter and dropped into the inside, it is necessary to prevent it from being caught halfway, and the work is complicated.
[0004]
In addition, there are reinforced concrete chimneys, iron chimneys with lining layers, etc., and appropriate selection of vertical cutting cutters and horizontal cutting cutters is required for these chimneys. It takes time to do.
[0005]
The present invention is intended to solve the above-mentioned problems, and it is possible to safely lay down a tower-like structure such as a chimney slowly in a tilting direction, easily cut, and shorten the construction period. An object is to provide a chimney dismantling method that can reduce work at high places.
[0006]
[Means for Solving the Problems]
The present invention provides a bearing on the left and right sides of the tower-like structure with respect to the tilting direction of the tower-like structure, and attaches a shaft penetrating the lower end of the tower-like structure to the bearing. A pair of arms each having one end pivotally supported on a shaft are provided, a center hole jack is rotatably attached to the tip of each arm, and the tip of the wire rope delivered from the center hole jack is connected to the tower-like structure. An auxiliary bearing corresponding to the arm is provided in a direction opposite to the tilting direction of the tower-like structure and connected to a ring attached above the center of gravity, and an auxiliary center hole jack can be rotated on the auxiliary bearing. Attach the tip of the wire rope delivered from the auxiliary center hole jack to the other end of the arm, and make a notch in the bottom of the tower-like structure. By stretching adjust each wire rope by Horu type jack, a dismantling method tower-like structure, characterized in that overturning dismantle the tower-like structure in the tilting direction.
[0007]
According to the present invention, the tower-like structure can be safely and slowly laid down in a tilting direction by pressing the auxiliary center-hole jack wire rope, and the tower-like structure can be placed on the ground. Since it can be easily disassembled by cutting or the like, the dismantling period of the tower-like structure can be shortened, and work at high places can be reduced.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a side view showing an embodiment of the present invention, FIG. 2 is a front view taken along line AA in FIG. 1, and FIG. 3 is a view showing a state in which the chimney of FIG. FIG. 4 is an explanatory view of a center hole jack used in the present invention. Here, a chimney dismantling method will be described in detail as a typical tower-like structure targeted in the present invention.
As shown in FIGS. 1 and 2, the chimney dismantling apparatus used in the present invention includes bearings 3a and 3b and bearings 3a and 3b provided on the foundations 2 on the left and right sides of the chimney 1 with respect to the tilting direction of the chimney 1. A shaft 4 penetrating the lower end of the chimney 1 to be attached to, a pair of arms 5a and 5b provided to be supported at both ends of the shaft 4, and attached to the tips of the arms 5a and 5b, and wire ropes 6a and 6b The center hole type jacks 8a and 8b housed in the swing frames 10a and 11b as shown in FIG. 4 are connected to the ring 7 attached above the center of gravity W of the chimney 1 and the direction opposite to the tilt direction of the chimney 1 is connected. Attached to auxiliary jack bearings 11a and 11b and auxiliary jack bearings 11a and 11b provided in the direction, and swing frames 12a and 12b connecting the ends of the wire ropes 14a and 14b to the other ends of the arms 5a and 5b. Paid auxiliary for center-hole jacks 13a, it is composed of a 13b. Reference numerals 9a and 9b are jack bearings. Reference numeral 15 is a foundation, and reference numeral 16 indicates the ground.
In the present invention, it is necessary to select and use a center hole type jack from generally known jacks. As shown in FIG. 4, the center hole jack 17 includes a cylinder 18, a front end chuck 19, and a rear end chuck 20 (chimney side). When manually pulling the wire rope 21, the piston rod 22 is extended by hydraulic pressure so that the tip chuck 19 chucks the wire rope 21, and the wire rope 21 is dragged by the stroke. At this time, when the rear end chuck 20 is loosened and the piston rod 22 is retracted by hydraulic pressure, the rear end chuck 20 chucks the wire rope 21 and the front end chuck 19 is loosened, whereby the position of the wire rope 21 is maintained. In this state, the piston rod 22 is accommodated in the cylinder 18. By repeating this operation, the predetermined length of the wire rope 21 is drawn by hand. When the wire rope 21 is extruded, the reverse operation is performed. Reference numeral 23 denotes a swing frame, and reference numeral 24 denotes a jack bearing. Reference numeral 25 denotes a fixed plate provided at the tip of the arm. The same applies to the auxiliary center hole jack. A pair of center hall jacks are operated by a single worker by a control device (not shown).
Next, the case where a chimney is disassembled by the above-described chimney disassembly apparatus will be described in detail.
After the chimney dismantling device is installed in the chimney 1 to be disassembled as described above, the wire ropes 6a and 6b and the wire rope 12a are operated by the operation of the center hole jacks 8a and 8b and the auxiliary center hole jacks 13a and 13b. The arms 5a and 5b are rotated to appropriate positions as shown in FIG.
Next, in a state where the wire ropes 6a, 6b and the wire ropes 12a, 12b are stretched, the lower end portion on the tilt side of the chimney 1 is cut with a cutter (not shown).
In the present invention, the position of the shaft 4 penetrating the lower end portion is shifted from the axial center 9 of the chimney 1 in the direction opposite to the tilt side, and when the cut is made, the chimney 1 is easily tilted to the tilt side. . However, the cutting direction is not limited to the above, as long as it can be appropriately tilted to the tilt side. In a state where the wire ropes 6a, 6b and the wire ropes 12a, 12b are stretched, the chimney 1 is gradually inclined by cutting as shown in FIG. Here, while the arms 5a and 5b are rotated to the state shown by the two-dot chain line, the wire ropes 6a and 6b and the wire ropes 12a and 12b are stretched by adjusting the expansion and contraction. When the chimney 1 is inclined to a predetermined angle, the incision is made from the opposite side while utilizing the weight of the chimney 1.
As shown in FIG. 3, the chimney 1 is further tilted and in a state indicated by a two-dot chain line due to the cutting and its own weight, with the wire ropes 6 a and 6 b and the wire ropes 12 a and 12 b stretched. Then, while being restrained and restrained by the wire ropes 6a and 6b and the wire ropes 12a and 12b, they slowly lie down on the ground.
The chimney 1 lying on the ground is easily crushed by a heavy machine, and in the case of a reinforced concrete chimney, the concrete is destroyed and the rebar portion is easily cut. In the case of an iron chimney having a lining layer, the lining layer peels off and the iron portion is easily cut.
The operation of the pair of center hall jacks by the above disassembly can be operated by one worker by a control device (not shown).
According to the dismantling method of the present invention, the dismantling of an iron chimney having a lining layer with a height of 85 m is shortened to 2/3 or less compared with the dismantling by cutting from the upper part of the conventional construction period by preparation, dismantling and cutting. it can.
[0009]
Although the chimney dismantling method has been described above, the present invention can be applied to other tower-like structures and the like, and the shape is not limited to a cylindrical shape but can be applied to a square shape or the like. Further, in the case of a structure that is easily chipped, such as concrete, a sleeve can be inserted into the through hole in the lower end portion to reinforce and penetrate the shaft.
[0010]
【The invention's effect】
As described above, according to the present invention, a tower-like structure such as a chimney can be safely and slowly laid down in a tilting direction by holding the auxiliary jack with a wire rope, and the tower-like structure is cut on the ground or the like. Since it can be easily dismantled, the dismantling period of the tower-like structure can be shortened, and work at high places can be reduced.
[Brief description of the drawings]
FIG. 1 is a side view showing an embodiment of the present invention.
FIG. 2 is a front view taken along line AA in FIG.
FIG. 3 is a diagram showing a state in which the chimney of FIG. 1 is overturned.
FIG. 4 is an explanatory view of a center hole type jack used in the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Chimney 2 Foundation 3a, 3b Bearing 4 Shaft 5a, 5b Arm 6a, 6b, 14a, 14b, 21 Wire rope 7 Ring 10a, 10b, 12a, 12b23 Swing frame 8a, 8b, 17 Center hole type jack 9a, 9b24 For jack Bearings 11a, 11b Auxiliary jack bearings 13a, 13b Auxiliary center hole jack 15 Foundation 16 Ground 18 Cylinder 19 Front end chuck 20 Rear end chuck 22 Piston rod 25 Fixed platen

Claims (1)

Bearings are provided on the left and right foundations of the tower-like structure with respect to the tilting direction of the tower-like structure, and a shaft penetrating the lower end of the tower-like structure is attached to the bearing, and one end is attached to the shaft A pair of pivoted arms is provided, and a center hole jack is rotatably attached to the tip of each arm, and the tip of the wire rope sent from the center hole jack is attached above the center of gravity of the tower-like structure. An auxiliary bearing corresponding to the arm is provided in a direction opposite to the tilting direction of the tower-like structure, and an auxiliary center hole jack is rotatably attached to the auxiliary bearing. The tip of the wire rope delivered from the auxiliary center hole jack is connected to the other end of the arm, and a notch is made in the bottom of the tower-like structure. The center hole jack and the auxiliary center hole And stretching to adjust each wire rope by a jack, demolishing method tower-like structure, characterized in that overturning dismantle the tower-like structure in the tilting direction.

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