JPH07197671A - Method of wire sawing construction of reinforced concrete structure - Google Patents

Abstract

PURPOSE:To enable the smooth travelling of a cutting cable by stretching the cable for cutting, in which cutting capacity is imparted to a wire rope, on a reinforced concrete structure while circulating the cable and making the cable travel by a cable driving gear. CONSTITUTION:Cables 18 for cutting guided by a pair of guide pulleys 7a, 7b are installed onto the same plane as the cutting predetermined surface of the surface of a reinforced concrete structure 2 along the surface of the reinforced concrete structure 2. A cable driving gear 15 is operated for circulating the cutting cable 18 and making the cutting cable 18 travel under an endless state under the adjustment of tension and travelling speed through an auxiliary guide pulley 8c mutually separating the cable 18 for cutting. When a cable driving pulley 16 is rotated and driven while the cable driving gear 15 is energized movably along a rail 11, the cable 18 for cutting is circulated and made to travel under required tension. The reinforced concrete structure 2 rubbed and contacted with the cable 18 for cutting is cut gradually from the surface of the structure 2 to the inside of the structure 2. Accordingly, damage due to the mutual contact of the cable 18 for cutting can be prevented.

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 of a reinforced concrete structure for cutting and dismantling a reinforced concrete structure such as a building, a bridge or a foundation by wire sawing.

[0002]

2. Description of the Related Art Disc blade cutters have been widely used for partial disassembly of reinforced concrete structures, but they have been reduced in size and weight because of blade manufacturing, workability, and handling. Therefore, the cutting ability is poor, the cutting cross-sectional area is limited to a narrow range, and the maximum cutting depth is about 30 to 40 cm. Further, in the case of the partially disassembled body by the rotation of such a disc blade, there is a problem that an overcut is required even at a portion which is not required to be cut.

In order to solve these problems all at once, the present inventor has recently developed a method for cutting and dismantling a reinforced concrete structure by wire sawing. In this construction 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 under controlled traveling speed and tension.

In this case, the cutting cable usually has a structure in which beads having a diamond abrasive grain layer are arranged on a wire rope at an appropriate pitch, with or without a coil spring or other spacer interposed therebetween. Further, the cable drive device has, for example, a structure including a drive pulley around which a cutting cable is wound, a hydraulic motor and a transmission motor for rotating the cable drive pulley, and other accessory mechanisms, and is arranged along a track. What is made to move, specifically, one that moves on the rail by the drive wheels and one that moves on the rack by the drive pinion are appropriately used.

During wire sawing of reinforced concrete structures, the cutting cable generally has a relatively gentle bend during the early to middle stages of cutting, that is, it runs smoothly with a large radius of curvature and has not only concrete layers in contact but also reinforcing bars. Cut without any problem. However, at the end of cutting, when the diameter and cross-sectional area of the uncut portion become smaller,
Since the cutting cable also runs with a small sharp bend in the portion that comes into contact with the uncut portion, metal fatigue of the wire rope in the cutting cable progresses, and further, the beads and spacers that cannot bend with the wire rope are present. In particular, there is a problem that the wire is caught by the reinforcing bar to hinder the running of the cutting cable, an abnormal load is applied to the wire rope, and a wire lobe is broken or a spacer is easily damaged. If the wire rope of the cutting cable breaks during the wire sawing of the reinforced concrete structure, the wire will be repaired at the breaking point, replaced with a new cutting cable, and the cutting cable will be installed again. Since the sawing is interrupted, productivity is greatly reduced, and the broken cutting cable bounces away from the reinforced concrete structure, causing a danger to the surroundings.

Further, the cutting cable has a problem in that even if there is no breakage accident during the wire sawing, the cutting cable jumps away from the reinforced concrete structure at the same time as the end of cutting, causing a danger to the surroundings. .

As a countermeasure, a pair of guide pulleys are installed on the surface of the reinforced concrete structure to be cut on the same plane as the planned cutting surface, and the cutting cable is hung from the outside of the guide pulleys. It has been previously proposed by a person (Japanese Patent Publication No. 4-10956). Further, in the above proposal, in addition to the pair of guide pulleys, an appropriate auxiliary pulley is installed, and a cutting cable is driven from an object to be cut into a driving device. I also try to run smoothly.

[0008]

In the wire sawing method for a reinforced concrete structure described above, various guide pulleys are used for smooth running of the cutting cable. At that time, a horizontal pulley and a vertical pulley are used. To convert the cutting cable from running in a horizontal plane to running in a vertical plane, or vice versa, and by installing this combination pulley in an appropriate inclined state, It is possible to change the traveling direction from the plane to the plane perpendicular to it.

When a pair of such combination pulleys, which are a combination of a horizontal pulley and a vertical pulley, are installed and a cutting cable is run, a reciprocating route from the combination pulley to the drive device is limited due to the restriction of the installation location of the drive device. Sometimes the cutting cables of a book have to come close to each other. In that case, during the driving of the cutting cable, it becomes impossible to keep the two cutting cables in different running directions in a completely parallel state. Since the cable is on the loose side, it may run loose. by the time,
Two cutting cables running at different speeds in different running directions will come into contact with each other, and the diamond beads that are properly fixed to the cutting cable will collide, damaging the diamond beads, and in extreme cases, the cutting cable. May be disconnected.

Therefore, according to the present invention, when the cutting cable for wire sawing is guided by the pair of guide pulleys, the cutting cables guided by the guide pulleys and running and contacting each other are prevented from being damaged. It is intended to provide a wire sawing method for a reinforced concrete structure.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed along the surface of a reinforced concrete structure,
The cutting cables guided by a pair of guide pulleys that are installed on the same plane as the planned cutting surface are endlessly circulated while adjusting tension and traveling speed via auxiliary guide pulleys that are separated from each other. This is a method of constructing a wire sawing method for a reinforced concrete structure characterized by.

[0012]

Since the present invention is constructed as described above, the reinforced concrete structure is cut by circulating the cutting cable hung on the reinforced concrete structure. At this time, the traveling cutting cables are guided by the pair of guide pulleys, and the cutting cables guided by the pair of guide pulleys are separated from each other by the auxiliary guide pulleys to prevent them from coming into contact with each other.

[0013]

Embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1 and FIG. 2, a quadrangular prismatic reinforced concrete structure 2 that is a body to be cut is hung vertically on a road surface 1. In the reinforced concrete structure 2, reinforcing bars 4 are arranged in a concrete layer 3 in an axial direction. Is configured. A first guide pulley base 5 is fixed to the surface of the reinforced concrete structure 2 by an anchor 6, and a pair of horizontally oriented first main guide pulleys 7a and 7b and a first main guide are mounted on the first guide pulley base 5. 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 passing through the pulley groove.
However, each is rotatably mounted.

An auxiliary guide pulley base 5'projects downwardly between the second main guide pulleys 8a and 8b of the first guide pulley base 5, and the auxiliary guide pulley base 5'provides auxiliary A guide pulley 8c is rotatably mounted on the shaft. As will be described later, this auxiliary guide pulley 8c is used for mutual cutting when one of the two cutting cables extending from the second main guide pulleys 8a, 8b toward the cable drive device 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, 8b are convenient for handling and installation if they are integrated by the first guide pulley base 5 as described above, but it does not matter if they are installed individually. 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 at a distance from the reinforced concrete structure 2 and further adjacent thereto, the rail 1
1 is laid. On the second guide pulley base 9, vertically oriented loose side guide pulleys 12 and 13 and a tension side guide pulley 14 are rotatably mounted, and a cable drive device 15 is movably installed on the rail 11. There is. The cable drive device 15 includes a cable drive pulley 16 and a drive mechanism thereof (not shown), a drive wheel 17 fitted to the rail 11 and a drive mechanism thereof (not shown).

As shown by the broken line in the drawing, the cutting cable 18 is hung on the cable drive pulley 16 and starts from its slack side, and the slack side guide pulley 12,
13 passes through one of the second main guide pulleys 8a and is wound around the reinforced concrete structure 2 from the outside of the adjacent first main guide pulley 7a, passes through the inside of the other first main guide pulley 7b, and is adjacent to it. It is pulled out from the second main guide pulley 8b, and is arranged in an endless state so as to return to the tension side of the cable drive pulley 16 via the tension side guide pulley 14.

When it is necessary to cut only a predetermined section of the reinforced concrete structure 2 when, for example, partially cutting or forming an opening, the cutting cable 18 is used.
1 or 2 which penetrated through the reinforced concrete structure 2 instead of being wrapped around the entire circumference of the reinforced concrete structure 2.
It suffices to hang it so as to pass through the individual perforated portion (not shown).

In the above, when the cable drive device 15 is operated and the cable drive pulley 16 is rotationally driven while urging the cable drive device 15 along the rail 11 so as to be movable in the right direction in the drawing, the cutting cable 18 has the required tension. The reinforced concrete structure 2 that circulates downwards and comes into frictional contact with it is gradually cut from its surface to the inside.

The first main guide pulleys 7a, 7a
Although b is oriented horizontally in the case of horizontal cutting as described above, it is the same in the case of inclined cutting or vertical cutting and is installed on the same plane as the planned cutting surface. Further, the installation angle of the second main guide pulleys 8a and 8b with respect to the first main guide pulleys 7a and 7b is a right angle in the above case, but the cutting cable 18 to the cable drive pulley 16 is
An angle other than a right angle may be adopted depending on the arrangement mode of. 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, so that the cutting cable 18 has a first main guide for cutting along the tangent line. Pulley 7
Second main guide pulleys 8a, 8 corresponding to a, 7b
The bridge can be smoothly crossed so that it can run between b.

Also, the second main guide pulleys 8a, 8
b, the slack side guide pulleys 12, 13, the tension side guide pulley 14, etc., the endless cutting cable 18 hung on the upper cutting point in the reinforced concrete structure 2 to the cable drive pulley 16 of the cable drive device 15 on the road surface 1. , Which helps to guide the vehicle smoothly so that it can travel. Therefore, the cutting point and the cable drive pulley 1
Depending on the arrangement relationship with 6, the guide pulleys are not necessary, or guide pulleys of another mode are installed on the road surface 1, the reinforced concrete structure 2, the cable drive device 15, and the like. For example, when the cutting point is below the cable drive device 15, for example, when the root part of the reinforced concrete structure 2 underwater is wire sawed by the cable drive device 15 installed on land, the second main pulley 8a, 8b to the first main guide pulley 7
The cutting cable 18 can be installed above the a and 7b and guided upward.

As the cutting progresses, the contact portion of the cutting cable 18 with the reinforced concrete structure 2 travels while curving, and the curving portion gradually moves toward the first main guide pulleys 7a, 7b. Since the cutting cable 18 is arranged from the outside of the one first main guide pulley 7a to the inside of the other first main guide pulley 7b through the reinforced concrete structure 2, at the end of cutting. Even if
The distance between the tension side and the slack side of the cutting cable 18 hung on the uncut portion of the reinforced concrete structure 2 is less than or equal to the distance between the outside of the one first main guide pulley 7a and the inside of the other first main guide pulley 7b. Since it does not become narrower, the bending of the contact portion does not become extremely small and sharp or bends as shown by the one-dot chain line in the drawing, and the cutting cable 18 is unlikely to break.
The first main guide pulleys 7a and 7b are preferably installed so that the distance between the tight side and the loose side of the cutting cable 18 is appropriately wide.

When the cutting is completed, the cutting cable 1
Even if 8 is separated from the reinforced concrete structure 2, the cutting cable 18 is hooked on one of the first main guide pulleys 7a and stopped, so that dangerous splashing 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 guiding function of the cutting cable, in the present invention, the auxiliary guide pulley 8c is further provided as described above and as shown in the drawing, so that the slack Side guide pulley 13
The cutting cable 18 from one to the second main guide pulley 8a is once guided to the auxiliary guide pulley 8c. Therefore, the two cutting cables extending from the pair of second main guide pulleys toward the cable drive device are separated from each other, and the two cutting cables do not come into contact with each other.

Particularly, when the cutting plane of the reinforced concrete structure is relatively close to the installation plane of the cable drive device 15, both the second main guide pulleys 8a, 8b.
The two cutting cables 18 extending from the cable drive device side to the cable drive device side are close to each other. In addition, depending on the state of the fixed surface of the first guide pulley base 5 of the reinforced concrete structure that is the object to be cut, even when the second main guide pulleys 8a and 8b cannot be installed sufficiently separated from each other, both the second main pulleys 8a and 8b can be installed. The two cutting cables 18 extending from the guide pulleys 8a and 8b to the cable driving device side are close to each other. Particularly, in this case, when the cutting cables are guided inside the second main guide pulleys 8a and 8b facing each other, the two cutting cables 18 are further brought close to each other.

However, by providing the auxiliary guide pulley 8c as described above, the cutting cables extending from the second main guide pulleys 8a and 8b toward the cable drive device are separated by at least the diameter of the auxiliary guide pulley 8c. Both cutting cables can contact each other, the diamond beads fixed to the cable wires collide with each other and are damaged, or both are entangled and the cutting cable cuts, etc. It is possible to prevent damage.

In the above embodiment, the cutting cable to be hung on the reinforced concrete structure which is the object to be cut is for sharpening the cutting cable near the end of cutting and preventing jumping of the cutting cable at the end of cutting.
The example of the cutting cable to be hung on the pair of first main guide pulleys is such that one of the first main guide pulleys is hung so as to pass through the outside thereof, and the other first main guide pulley is hung so as to pass through the inside thereof. However, in order to perform the above-mentioned action, it is sufficient to hang it so as to pass through the outside of at least one of the first main guide pulleys. For example, it may be hung so as to pass through the outside of both of the first main guide pulleys. Nor.

The present invention is conceivable in various embodiments as shown in FIGS. 3 to 9 in addition to the above embodiment. That is,
In the embodiment shown in FIG. 3, in addition to the guide pulleys of the above embodiment, side guide pulleys 20 are installed, and even if a pair of main guide pulleys are arranged close to each other, they are for cutting when the cutting is about to end. It has less 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 the vertical direction on the side surface 2'on which the cutting cable is wound around the reinforced concrete structure. Among them, in the embodiment shown in FIG. 5, side guide pulleys 20, 21 are arranged on both sides of the main guide pulleys 7a, 7b, 8a, 8b. In this example, as shown in FIG. 5B, the auxiliary guide pulley 8c is the second main guide pulley 8a, which is close to the object to be cut.
The cutting cable extending from 8b to the cable driving device side is installed so as to be separated from the other cutting cable. In this example, the side guide pulley 21 acts as a guide after the cutting has proceeded.

The embodiment shown in FIG. 6 is different from the embodiment shown in FIG. 5 in that one side guide pulley 20 is arranged with the main guide pulley as the center and the other side guide pulley 21 is arranged.
The side guides 20 and 21 are arranged close to each other, and in this example, both of the side guides 20 and 21 perform a guiding action after the cutting progresses. Auxiliary guide pulley 8 in this example
c is installed in the same manner as in FIG.

In the embodiment shown in FIG. 7, the first main guide pulley 7b is flush with the side surface of the reinforced concrete structure 5.
Are arranged so that the guide surfaces of the side guide pulleys are located, and only the side guide pulleys 21 are provided, whereby installation of one of the side guide pulleys is omitted. Also in this example, the auxiliary guide pulley 8c is installed in the same manner as in FIG.

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

The embodiment shown in FIG. 9 shows an example in which the main guide pulleys in the embodiments 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 together serve as a guide after the cutting has proceeded. The auxiliary guide pulley 8c can be installed in the same manner as in Fig. 5B.

When the main guide pulley is arranged as in the embodiment shown in FIG. 9, it can be installed in the same manner in the embodiments shown in FIGS. 6 to 8. Besides this,
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]

Since the present invention is constructed and operates as described above, the cutting cables guided by the pair of guide pulleys do not come into contact with each other and are damaged, and the reinforced concrete structure which is the object to be cut. However, it is possible to safely arrange the guide pulley, the cable drive device, and the like in various modes.

[Brief description of 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 the same side view.

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 the same side view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Road surface 2 Reinforcement concrete structure 3 Concrete layer 4 Reinforcing bar 5 1st guide pulley stand 6 Anchors 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 and 13 Loose side guide pulley 14 Tension side guide pulley 15 Cable drive device cable 16 Cable drive pulley 17 Drive wheel 18 Cutting cable 20 Side guide pulley

Claims (10)

[Claims] 1. Tension and travel along an auxiliary guide pulley for separating a cutting cable guided by a pair of guide pulleys installed on the same plane as the planned cutting surface along the surface of the reinforced concrete structure. A wire sawing method for a reinforced concrete structure, which is characterized in that endless circulation is performed under controlled speed. 2. The pair of guide pulleys comprises a first main guide pulley and a second main guide pulley,
The wire sawing method for a reinforced concrete structure according to claim 1, wherein the second main guide pulley is installed adjacent to the first main guide pulley with a tangent line passing through the pulley groove of the first main guide pulley being common. . 3. The wire sawing method for a reinforced concrete structure according to claim 2, wherein a side guide pulley is provided outside the first main guide pulley. 4. The wire sawing method for a reinforced concrete structure according to claim 2, wherein the second main guide pulley is arranged inside the first main guide pulley. 5. The reinforced concrete structure according to claim 1, wherein a cutting cable extending from the main guide pulley toward the cable drive device is arranged in a vertical direction on a side surface around which the cutting cable is wound around the reinforced concrete structure. Wire sawing method. 6. The wire sawing method for a reinforced concrete structure according to claim 5, wherein side guide pulleys are provided on both sides of the first main guide pulley. 7. The both side guide pulleys are provided on one side of the first main guide pulley.
Wire sawing method for reinforced concrete structures described. 8. The first main guide pulley and the second main guide pulley are arranged such that the guide surfaces of the first main guide pulley and the second main guide pulley are located on the same surface as the side surface of the reinforced concrete structure, and the side guide pulleys are the first and second main guide pulleys. The wire sawing method for a reinforced concrete structure according to claim 2, wherein the wire sawing method is provided on one side. 9. The wire sawing method for a reinforced concrete structure according to claim 2, wherein the first main guide pulley and the second main guide pulley are installed in the reinforced concrete structure. 10. The reinforced concrete according to claim 2, wherein the second main guide pulley is arranged closer to the reinforced concrete structure side than the first main guide pulley, and side guide pulleys are provided on both sides of the first main guide pulley. Construction wire sawing method.