JP3027819B2 - Wire sawing method for reinforced concrete structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire-sawing method for a reinforced concrete structure in which a reinforced concrete structure such as a building, a bridge or a foundation is cut and dismantled by wire sawing.

[0002]

2. Description of the Related Art A disk blade type cutting machine has been widely used as a partially disassembled body for cutting a reinforced concrete structure, but it has been reduced in size and weight due to the convenience of blade production, workability, handling and the like. Therefore, the cutting ability is inferior, the cutting sectional area is limited to a narrow range, and the maximum cutting depth is about 30 to 40 cm. Further, in the case of such a partially disassembled body by the rotation of the disk blade, there is a problem that an overcut is required even at a cutting unnecessary portion.

In order to solve these problems at once, the present inventor has recently developed a method of cutting and disassembling a reinforced concrete structure by wire sawing. In this method, a cutting cable obtained by imparting a cutting ability to a wire rope is hung on a reinforced concrete structure, and the cutting cable is circulated by a cable driving device at a controlled traveling speed and tension.

In such a case, the cutting cable usually employs a structure in which beads having a diamond abrasive layer are arranged at an appropriate pitch on a wire rope with or without a coil spring or other spacer. In addition, the cable driving device is, for example, a structure having a driving pulley around which a cutting cable is wound, a hydraulic motor or a transmission motor for rotating the cable driving pulley, and other prime movers, and other attached mechanisms, and along a track. A device that moves, specifically, a device that moves on a rail by a drive wheel or a device that moves on a rack by a drive pinion, is used as appropriate.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a method for manufacturing a reinforced concrete structure along a surface thereof.
And a pair of first main
Install the id pulley and set the 1st main guide pulley
Make the tangential line passing through the pulley groove
A pair of second main guides installed adjacent to the
At least one of the cutting cables passing through the pulley
Of reinforced concrete from outside the first guide pulley
Attach the auxiliary guide pulley to the second gear
On the same surface as the idling pulley, and
The second guide pulley through the cutting cable to the outside
The cutting cables guided by
And wire saw for reinforced concrete structures
It constitutes the inging method.

[0006] Further, even if the above-mentioned breakage accident does not occur during the wire sawing, the cutting cable has a problem that it jumps away from the reinforced concrete structure at the same time as the end of the cutting, causing danger to the surroundings. .

As a countermeasure, the present application proposes to install a pair of guide pulleys on the surface of a reinforced concrete structure to be cut on the same plane as the plane to be cut, and to hang a cutting cable from outside the guide pulley. In addition, in the above proposal, an appropriate auxiliary pulley is installed in addition to the pair of guide pulleys, and a cutting cable is driven from the workpiece by a driving device. It also makes it possible to run smoothly.

[0008]

In the above-described wire sawing method for reinforced concrete structures, various guide pulleys are used for the smooth running of the cutting cable. At this time, a horizontal pulley and a vertical pulley are used. By converting the cutting cable from traveling in the horizontal plane to traveling in the vertical plane, or vice versa, furthermore, by installing this combination pulley in an appropriate inclined state, From the running direction to a plane perpendicular to the running direction.

When a pair of pulleys composed of a combination of a horizontal pulley and a vertical pulley is installed and a cutting cable is run, a reciprocating motion from the combined pulley to the driving device is required due to the restriction on the installation location of the driving device. Sometimes the cutting cables have to be close to each other. In this case, during the driving of the cutting cable, the two cutting cables having different running directions cannot maintain a completely parallel state. Since the cable is on the loose side, it may run loose. by the time,
Two cutting cables running at high speeds in different running directions come into contact with each other, and the diamond beads fixed appropriately to the cutting cables collide and damage the diamond beads. In severe cases, the cutting cables are used. May be cut.

Therefore, according to the present invention, when a cutting cable for wire sawing is guided by a pair of guide pulleys, the cutting cables guided and guided by the respective guide pulleys are prevented from coming into contact with each other to cause breakage. An object of the present invention is to provide a wire sawing method for reinforced concrete structures.

[0011]

According to the present invention, there is provided a reinforced concrete structure, comprising:
The cutting cable guided by a pair of guide pulleys installed on the same plane as the cutting surface is circulated endlessly under the control of tension and running speed via auxiliary guide pulleys for separating from each other. And a wire sawing method for a reinforced concrete structure.

[0012]

According to the present invention, as described above, the reinforced concrete structure is cut by the circulation of the cutting cable hung on the reinforced concrete structure. At this time, the traveling cutting cable is guided by a pair of guide pulleys, and the cutting cables guided by the pair of guide pulleys are separated from each other by an auxiliary guide pulley, and are prevented from contacting each other.

[0013]

An embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, a quadrangular prism-shaped reinforced concrete structure 2 which is a body to be cut is erected on a road surface 1, and the reinforced concrete structure 2 has reinforcing bars 4 disposed in a concrete layer 3 in an axial direction. It is configured. A first guide pulley base 5 is fixed to the surface of the reinforced concrete structure 2 by an anchor 6, and the first guide pulley base 5 has a pair of horizontally oriented first main guide pulleys 7a and 7b and a first main guide. Pulleys 7a, 7b
And a pair of vertically oriented second main guide pulleys 8a, 8b adjacent to each other and having a common tangent line through the pulley groove.
Are rotatably mounted on respective shafts.

An auxiliary guide pulley base 5 'projects downward between the second main guide pulleys 8a and 8b of the first guide pulley base 5, and the auxiliary guide pulley base 5' A guide pulley 8c is rotatably mounted on a shaft. As will be described later, the auxiliary guide pulley 8c is used for mutual cutting when one of two cutting cables extending from the second main guide pulleys 8a and 8b to the cable driving device side is hung on the auxiliary guide pulley 8c. The cables are arranged so as to be separated from each other.

The first main guide pulleys 7a, 7
b and the second main guide pulleys 8a and 8b are more conveniently integrated and integrated with the first guide pulley base 5 as described above for handling and installation. Alternatively, it may be installed on a fixed object other than the reinforced concrete structure 2, for example, on the road surface 1.

On the other hand, on the road surface 1, a second guide pulley base 9 is fixed by an anchor 10 slightly away from the reinforced concrete structure 2, and further adjacent to the second guide pulley base 9,
1 is laid. On the second guide pulley base 9, vertically oriented loose side guide pulleys 12, 13 and tight side guide pulley 14 are rotatably mounted on a shaft, and a cable driving device 15 is movably installed on the rail 11. I have. The cable driving device 15 includes a cable driving pulley 16 and a driving mechanism thereof (not shown), and a driving wheel 17 fitted to the rail 11 and a driving mechanism thereof (not shown).

The cutting cable 18 is hung on the cable driving pulley 16 and starts from a loose side thereof, as shown by a broken line in the drawing, and then comes off the loose side guide pulley 1.
Through the auxiliary guide pulley 8c , the second main guide pulley 8a, the first main guide pulley 7a adjacent to the auxiliary guide pulley 8a, the outer guide pulley 8a is wound around the reinforced concrete structure 2, and the other first main pulley 8a. It passes through the inside of the guide pulley 7b, is drawn out from the second main guide pulley 8b adjacent to the guide pulley 7b, and is disposed endlessly so as to return to the tight side of the cable drive pulley 16 via the tight side guide pulley 14.

If it is necessary to cut only a predetermined section of the reinforced concrete structure 2 at the time of partial cutting or formation of an opening, for example, the cutting cable 18 is required.
1 or 2 penetrated through the reinforced concrete structure 2 instead of being wound around the entire periphery of the reinforced concrete structure 2
What is necessary is just to hang so that it may pass through the perforation part (illustration omitted).

In the above, when the cable driving pulley 16 is rotated while the cable driving device 15 is operated, and the cable driving device 15 is urged along the rail 11 so as to be movable to the right in the drawing, the cutting cable 18 has a required tension. The reinforced concrete structure 2, which circulates downward and comes into frictional contact therewith, is gradually cut from its surface into its interior.

The first main guide pulleys 7a, 7
Although b is oriented horizontally in the case of horizontal cutting as described above, the same applies to the case of inclined cutting and vertical cutting, and is set on the same plane as the plane to be cut. Further, the installation angle of the second main guide pulleys 8a, 8b with respect to the first main guide pulleys 7a, 7b is a right angle in the above case, but the cutting cable 18 to the cable driving pulley 16 is provided.
Depending on the arrangement mode, an angle other than a right angle may be adopted. Since the second main guide pulleys 8a and 8b corresponding to the first main guide pulleys 7a and 7b have a common tangent line passing through the pulley groove, the cutting cable 18 is arranged along the tangent line so that the first main guide for cutting is formed. Pulley 7
a, 7b and corresponding second main guide pulleys 8a, 8
The bridge can be smoothly bridged so as to be able to run between b.

The second main guide pulleys 8a, 8
b, the loose-side guide pulleys 12, 13 and the tight-side guide pulley 14, etc., move the endless cutting cable 18 hung at the upper cutting point in the reinforced concrete structure 2 to the cable driving pulley 16 of the cable driving device 15 on the road surface 1. It is useful for guiding the vehicle smoothly. Therefore, the cutting point and the cable drive pulley 1
Depending on the arrangement relationship with 6, the guide pulleys may be unnecessary or another type of guide pulleys may be installed on the road surface 1, the reinforced concrete structure 2, the cable driving device 15, and the like. For example, when the cutting point is located below the cable driving device 15, for example, when the root of the reinforced concrete structure 2 in the water is wire sawed by the cable driving device 15 installed on land, the second main pulley 8 a, 8b to the first main guide pulley 7
The cutting cable 18 can be guided upward by being installed above a and 7b.

As the cutting progresses, the contact portion of the cutting cable 18 with the reinforced concrete structure 2 travels while bending, and the bent portion gradually moves in the direction of the first main guide pulleys 7a and 7b, as described above. Since the cutting cable 18 is disposed from the outside of one first main guide pulley 7a to the inside of the other first main guide pulley 7b via the reinforced concrete structure 2, at the end of cutting, Even if
The distance between the tight side and the loose side of the cutting cable 18 hung on the uncut portion of the reinforced concrete structure 2 is equal to or less than the distance between the outside of one first main guide pulley 7a and the inside of the other first main guide pulley 7b. Therefore, the bending of the contact portion does not become extremely small and sharp or does not bend, as shown by the dashed line in the drawing, and the cutting cable 18 is hardly broken.
It is preferable that the first main guide pulleys 7a and 7b be installed so that the distance between the tight side and the loose side of the cutting cable 18 is appropriately widened.

When the cutting is completed, the cutting cable 1 is cut.
Even if 8 is separated from the reinforced concrete structure 2, the cutting cable 18 is stopped by being hooked on one of the first main guide pulleys 7a, so that dangerous jumping does not occur.

The first main guide pulley 7 as described above
a, 7b and the second main guide pulleys 8a, 8b, in addition to the action of guiding the cutting cables, in the present invention, the auxiliary guide pulley 8c is further provided as described above and as shown in FIG. Side guide pulley 13
The cutting cable 18 from one to the second main guide pulley 8a is once guided by the auxiliary guide pulley 8c. Therefore, the two cutting cables extending from the pair of second main guide pulleys toward the cable driving device are separated from each other, and the two cutting cables do not contact each other.

In particular, when the cutting plane of the reinforced concrete structure is relatively close to the installation plane of the cable driving device 15, both the second main guide pulleys 8a and 8b are used.
The two cutting cables 18 extending from the cable drive device side to each other are close to each other. Also, depending on the state of the fixed surface of the first guide pulley table 5 of the reinforced concrete structure to be cut, even when the second main guide pulleys 8a and 8b cannot be installed while being separated from each other, the second main pulleys 8a and 8b cannot be installed. The two cutting cables 18 extending from the guide pulleys 8a and 8b toward the cable driving device are close to each other. In particular, at this time, when the cutting cable is guided inside the opposed second main guide pulleys 8a and 8b, the two cutting cables 18 are further closer to each other.

However, by providing the auxiliary guide pulley 8c as described above, the cutting cable extending from both the second main guide pulleys 8a and 8b to the cable driving device can be separated by at least the diameter of the auxiliary guide pulley 8c. The cutting cable can be held, and both cutting cables come into contact with each other, the diamond beads fixed to the cable wire collide with each other and break, or the cutting cables are cut because the two are entangled. Damage can be prevented.

In the above embodiment, the cutting cable 18 hung on the reinforced concrete structure 2 as the object to be cut has an acute angle near the end of cutting and prevents the cutting cable from jumping at the end of cutting. Therefore, the cutting cable 18 that is hung on the pair of first main guide pulleys 7a and 7b is hung so that one of the first main guide pulleys passes through the outside and the other first main guide pulley passes through the inside. Although an example of hanging is shown, in order to perform the above-mentioned operation, it suffices that the hook is applied so as to pass through at least one of the first main guide pulleys. Needless to say, this is also good.

In the present invention, in addition to the above embodiment, various embodiments as shown in FIGS. 3 to 9 are conceivable. That is,
In the embodiment shown in FIG. 3, in addition to the guide pulley of the above embodiment, a side guide pulley 20 is provided, and even if a pair of main guide pulleys are arranged close to each other, the cutting for near-end of cutting is performed. It has reduced the bending of the cable,
Also in this example, the auxiliary guide pulley 8c is installed similarly to the embodiment shown in FIG.

In the embodiment shown in FIG. 4, the second main guide pulleys 8a and 8b of the above embodiment are arranged inside the first main guide pulleys 7a and 7b, and the auxiliary guide pulley 8c at this time is also shown in FIG. It is installed similarly to the embodiment shown in FIG.

In the embodiment shown in FIGS. 5 to 9, the cutting cable extending from the main guide pulley to the cable driving device side is arranged in a direction perpendicular to the side surface 2 'around which the cutting cable is wound around the reinforced concrete structure. In the embodiment shown in FIG. 5, side guide pulleys 20, 21 are arranged on both sides of main guide pulleys 7a, 7b, 8a, 8b. In this example, as shown in FIG. 5B, the auxiliary guide pulley 8c includes a second main guide pulley 8a close to the workpiece.
The cutting cable extending from 8b to the cable driving device side is set apart from the other cutting cable. In this example, the side guide pulley 21 acts as a guide after cutting has progressed.

The embodiment shown in FIG. 6 differs from the embodiment shown in FIG. 5 in that one side guide pulley 20 is connected to the other side guide pulley 21 around the main guide pulley.
In this example, both of the side guides 20 and 21 perform a guiding action after the cutting has progressed. Auxiliary guide pulley 8 in this example
c is installed similarly to FIG.

In the embodiment shown in FIG. 7, the first main guide pulley 7b is provided on the same surface as the side surface of the reinforced concrete structure 5.
And only the side guide pulley 21 is provided, thereby omitting the installation of one of the side guide pulleys. Also in this example, the auxiliary guide pulley 8c is installed similarly to FIG.

The embodiment shown in FIG. 8 is an embodiment in which the entire main guide pulley is installed at a position distant from the reinforced concrete structure 5, and only the side guide pulleys 20, 21 are installed in the reinforced concrete structure. Also in this example, the auxiliary guide pulley 8c is installed similarly to FIG.

The embodiment shown in FIG. 9 shows an example in which the main guide pulleys in the embodiment shown in FIGS. 5 to 8 are installed in the opposite direction, and the arrangement of the side guide pulleys 20 and 21 is shown in FIG. An arrangement similar to that of the embodiment is shown. Both side guide pulleys 20, 21 in this example both serve as a guide after the cutting has progressed. The auxiliary guide pulley 8c can be installed in the same manner as in FIG.

When the main guide pulley is arranged as in the embodiment shown in FIG. 9, it can be similarly installed in the embodiments shown in FIGS. In addition,
The main guide pulley is installed at an appropriate angle, or the side guide pulley and other auxiliary guide pulleys are installed in various combinations, and various embodiments such as horizontal cutting and vertical cutting can be arbitrarily selected.

[0036]

The present invention is constructed and operated as described above, so that the cutting cables guided by the pair of guide pulleys do not come into contact with each other to be damaged, and the reinforced concrete structure to be cut is used. However, it is possible to safely arrange the guide pulley, the cable driving device, and the like in various modes.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a plan view of another embodiment of the present invention.

FIG. 4 is a plan view of still another embodiment of the present invention.

FIG. 5A is a plan view of still another embodiment of the present invention;
(B) is a side view of the same.

FIG. 6 is a plan view of still another embodiment of the present invention.

FIG. 7 is a plan view of still another embodiment of the present invention.

FIG. 8 is a plan view of still another embodiment of the present invention.

FIG. 9A is a plan view of still another embodiment of the present invention,
(B) is a side view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Road surface 2 Reinforced concrete structure 3 Concrete layer 4 Reinforcement 5 1st guide pulley stand 6 Anchor 7a, 7b 1st main guide pulley 8a, 8b 2nd main guide pulley 8c Auxiliary guide pulley 9 2nd guide pulley stand 10 Anchor 11 Rails 12, 13 Loose side guide pulley 14 Tension side guide pulley 15 Cable drive cable 16 Cable drive pulley 17 Drive wheel 18 Cutting cable 20 Side guide pulley

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E04G 23/08 B24B 27/06 B28D 1/08

Claims (7)

(57) [Claims] 1. Along the surface of a reinforced concrete structure
And a pair of first main
Install the id pulley and set the 1st main guide pulley
Make the tangential line passing through the pulley groove
A pair of second main guides installed adjacent to the
At least one of the cutting cables passing through the pulley
Of reinforced concrete from outside the first guide pulley
Attach the auxiliary guide pulley to the second gear
On the same surface as the idling pulley, and
The second guide pulley through the cutting cable to the outside
The cutting cables guided by
And wire saw for reinforced concrete structures
Inging method. 2. The side outside the first main guide pulley
Part guide pulley on the same plane as the first guide pulley
The reinforcing bar concrete according to claim 1, wherein
Wire sawing method for building. 3. A cutting cable extending from the first and second main guide pulleys to the cable drive device in a direction perpendicular to a side surface around which the cutting cable is wound around the reinforced concrete structure. 2. A wire sawing method for a reinforced concrete structure according to 1. 4. A on both sides of the pair of first main guide pulley, wire sawing method according to claim 3 concrete construct according to characterized in that a lateral guide pulleys, respectively. On one side of the 5. A first main guide pulley, claim 3, characterized in that a both sides guide pulley
The wire sawing method for the reinforced concrete structure according to the description. 6. The first and second main guide pulleys are arranged so that guide surfaces of a first main guide pulley and a second main guide pulley are located on the same plane as a side surface of a reinforced concrete structure, and a side guide pulley is provided. The wire sawing method for a reinforced concrete structure according to claim 3 , wherein the wire sawing method is provided on one side of the wire. 7. The wire according to claim 3, wherein the second main guide pulley is disposed closer to the reinforced concrete structure than the first main guide pulley, and side guide pulleys are provided on both sides of the first main guide pulley. Guide pulley device for sewing.