JPH0479788B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for cutting stone or concrete structures using an endless wire saw.

[Conventional technology]

A wire saw used for cutting hard objects was previously proposed by the present applicant in Japanese Patent Application No. 173283/1983. As illustrated in Figure 8,
The wire saw S consists of a rope 1 formed by a plurality of spirally twisted metal cables, and a plurality of metal bushes 2 are mounted on the rope 1 at equal intervals. The outer periphery is coated with diamond. A flexible sheathing 5 is formed on the rope 1, which sheathing 5 constitutes a spacer section 6 between each bush 2.

This wire saw S, as shown in Fig. 9,
It is rotationally driven by a drive device D. Drive device D
constitutes a truck 10 that is movably installed on the rails 9 of the base 8, and a drive pulley 11 of the truck 10.
The wire saw S is wrapped around the wire. A pair of tension pulleys 12 and 13 are supported by a base 8. The other end of the loop of the wire saw S is passed around a hard object C such as a stone or a concrete structure, and the hard object C is cut by driving the wire saw S to rotate by a drive pulley 11. The truck 10 is equipped with a winch 14, which drives the truck 10 backward in the direction of the arrow R by winding up the rope 15, so that the wire saw S can cut the hard object C while being pressed against it. I can do it.

[Problem to be solved by the invention]

The above cutting method requires not only rotating the wire saw S in the circumferential direction with respect to the hard object C, but also moving the cart 10 backward on the rail 9. That is, a fixed hard object C
The wire saw S is towed while cutting.

However, when the trolley 10 was moved and the wire saw S
When towing the wire saw S, the pulling distance β of the cutting and wrapping portion 17 with respect to the moving distance α of the trolley 10 is in the relationship α=β, and the distance between the driving wrapping portion 16 relative to the drive pulley 11 of the wire saw S and the hard object C being The distance L between the cutting and winding part 17 is constant and does not change.

Therefore, if the hard object C to be cut is long and the cutting distance becomes long, the backward movement distance of the cart 10 must be correspondingly large, and the rails 9 of the base 10 also need to be moved backwards. You will need something long. However, such sufficient space is often not available at excavation sites for stone, etc. Also,
The cutting method using a wire saw as mentioned above is
It is known that this work is also carried out for subway platform expansion work and cutting and removal work of building structures, but the usable space at such cutting sites of concrete structures is limited to an extremely narrow area. There is. Therefore, the problem that cutting operations are difficult or impossible may frequently occur.

[Means to solve the problem]

The present invention has been made to solve the above problems, and is configured as a means for solving the above problems.
An endless wire saw having a drive winding part 16 that is wound around a drive pulley 11 on the trolley 10 and a cutting winding part 17 that is wound around a hard object is rotated in the circumferential direction by the drive pulley 11 while In a method for cutting a hard object by pulling the cutting winding part 17 with the wire saw in a tensioned state by running the wire saw in a direction away from the hard object: A part of the wire saw in tension between the winding driving section 16 and the cutting winding section 17 is bypassed so that the towing movement distance β of the cutting winding section 17 with respect to the traveling distance α is set to α<β. The point is that the detour portion is forcibly extended.

〔Example〕

(First embodiment) In the first embodiment shown in FIG.
constitutes a truck 10 that is movably installed on rails 9 of a base 8, and the truck 10 is moved backward in the direction of arrow R by means of a backward moving means 20 such as a winch 14 that winds up a rope 15. A driving pulley 11 is mounted on the truck 10, and an endless wire saw S is wound around the pulley 11. The wire saw S has the same structure as the conventional example shown in FIG. A hard object C is cut while being rotated. This point is similar to the conventional example explained based on FIG.

A pair of auxiliary pulleys 21 and 22 are mounted on the base 8.
are provided, and the auxiliary pulleys 21 and 22 are movable in a direction F away from the trolley 10 via a guide device 23, and an auxiliary movement device 24 such as a fluid pressure cylinder is provided to execute the movement in the direction of separation. ing.

On the other hand, the truck 10 has a pair of bend pulleys 2.
5 and 26 are provided.

The wire saw S is wound between the drive winding part 16 for the drive pulley 11 and the cutting winding part 17 for the hard object C, after being wound from the drive winding part 16 around the auxiliary pulleys 21 and 22 in a folded manner. , and is further wound around the bend pulleys 25 and 26 in a folded manner and extended to the cutting winding part 17.

Therefore, according to the first embodiment, when the wire saw S is rotated in the circumferential direction to cut the hard object C, when the trolley 10 is moved in the backward direction R via the forward/backward moving means 20, the wire saw S teeth,
It is not only pulled by the driving winding part 16, but also detoured by the bend pulleys 25 and 26 between the driving winding part 16 and the cutting winding part 17. That is, even if the auxiliary pulleys 21 and 22 remain fixed without operating the auxiliary moving device 24, the bend pulley 2 moves as the trolley 10 moves backward.
5 and 26 move in the backward direction r, the detour portion T of the wire saw S extending between the auxiliary pulleys 21 and 22 and the bend pulleys 25 and 26 gradually extends. Therefore, the relationship between the backward moving distance α of the trolley 10 and the towing moving distance β of the cutting and wrapping portion 17 is α+T·r=β if there is only one detour portion T. In the case of the illustrated example, the detour portion T is configured at two locations between the two sets of auxiliary pulleys and the bend pulley, so α+2(T·r)=β. As a result, α<
β, so the driving part 1 by the wire saw S
6 and the cutting wrapping part 17 is gradually made smaller, so that the amount of cutting movement of the cutting wrapping part 17 relative to the hard object C is increased compared to the amount of backward movement of the cart 10. becomes possible.

Next, according to the first embodiment, in conjunction with the above operation, the auxiliary pulley 21 is moved by the auxiliary moving device 24.
22 can be moved in the direction F away from the trolley 10. In this case, the detour portion T of the wire saw S is further extended corresponding to the separation movement amount F, so the relationship between the backward movement distance α of the trolley 10 and the towing movement distance β of the cutting and wrapping portion 17 is ,α+
2(T·r·F)=β, and it becomes possible to further increase the towing distance of the cutting and wrapping portion 17 compared to the backward movement distance of the truck 10.

(Second Embodiment) In the second embodiment shown in FIG. 2, the configurations of the base 8 and the truck 10 are the same as those shown in FIG. 9, and are indicated by the same reference numerals.

Between the driving winding part 16 and the cutting winding part 17 of the wire saw S, a fixed pulley 28 fixed to a support base 27 and an auxiliary pulley 29 movable relative to the fixed pulley 28 are provided. It is set up.
The auxiliary pulley 29 is movable in the same direction r as the backward direction R of the truck 10, and is driven and moved by an auxiliary moving device 30 such as a fluid pressure cylinder.

The wire saw S has one side circumferential portion extending from the drive winding portion 16 wrapped around the fixed pulley 28 in a folded manner, and then wound around the auxiliary pulley 29 in a folded manner and extended to the cutting winding portion 17. There is.

Therefore, according to the second embodiment, when cutting the hard object C while rotating the wire saw S in the circumferential direction, the cart 10 is moved in the backward direction R via the backward moving means 20, and the auxiliary moving device When the auxiliary pulley 29 is moved in the direction of arrow r via the
8 and the auxiliary pulley 29 is gradually extended. Therefore, the backward movement distance α of the truck 10
The relationship between the towing distance β of the cutting and winding part 17 is α+T・r=β, and as a result, α<β.
The distance L between the cutting hook 17 and the cutting hook 17 is gradually made smaller, and it is possible to increase the amount of cutting movement of the cutting hook 17 relative to the hard object C compared to the amount of backward movement of the cart 10. become.

(Third Embodiment) The third embodiment shown in FIG. 3 has many parts in common with the configuration of the second embodiment. Therefore, to explain only the differences, in the wire saw S, one side circumferential portion extending from the driving winding portion 16 is guided by a pair of fixed pulleys 28, 28, and the fixed pulley 2
An auxiliary pulley 29 is located between 8 and 28. The auxiliary pulley 29 can be moved in the direction X perpendicular to the extending direction of the wire saw S via the auxiliary moving device 30. Therefore, the pair of fixed pulleys 2
The part of the wire saw S passed between 8 and 28 and the auxiliary pulley 29 constitutes a detour part T, and
The relationship between the backward movement distance α of 0 and the towing movement distance β of the cutting and winding portion 17 is α+T·X=β, and as a result, α<β.

(Fourth Embodiment) In the fourth embodiment shown in FIG. 4, the configurations of the base 8 and the trolley 10 are the same as those shown in FIG. 9, and are indicated by the same reference numerals.

The hard object C, which is the object to be cut, is located higher than the cart 10, and is located lower than the hard object C between the drive winding part 16 and the cutting winding part 17 of the wire saw S. An auxiliary pulley 31 is provided for pulling one side of the circumference downward. This auxiliary pulley 31 is movable along the support base 32 and can be moved downward r by an auxiliary moving device 33 such as a winch.

Therefore, according to the fourth embodiment, when cutting the hard object C while rotating the wire saw S in the circumferential direction, the cart 10 is moved in the backward direction R via the backward moving means 20, and the auxiliary moving device When the auxiliary pulley 31 is moved downward r via 33, the wire saw S is caused to extend the detour portion T between the cutting winding part 17 and the auxiliary pulley 31. Therefore, also in this case, the relationship between the backward movement distance α of the trolley 10 and the towing movement distance β of the cutting and wrapping portion 17 is α+T·r=β, and as a result, α<β.

(Additional Embodiment) In the first additional embodiment shown in FIGS. 5A and 5B, a direction changing device Y is provided between the driving winding part 16 and the cutting winding part 17 of the wire saw S. . This direction changing device Y is equipped with alignment pulleys 34 and 35 that are pivotally supported on a horizontal axis, and direction changing pulleys 36 and 37 that are pivotally supported on a vertical axis. Therefore, the wire saw S has a driving winding portion 16 wound around a driving pulley 11 that is rotationally driven around a horizontal axis.
Then, the upper and lower circumferential sides of the wire saw S are aligned at almost the same height via the alignment pulleys 34 and 35, and spread laterally via the direction conversion pulleys 36 and 37 to the cutting and wrapping portion 17. It will be extended. Therefore, according to this first additional embodiment, the hard object C is
can be cut horizontally.

In a second additional embodiment shown in FIGS. 6A and 6B, the direction changing device Y has a pair of direction changing pulleys 36 and 37 arranged one above the other, which are supported on a vertical axis. Wire saw S has drive pulley 1
1 to the driving winding part 16 to the direction conversion pulley 3
6, 37, the direction changing pulley 3
6 and 37, the extending direction is bent and converted laterally to reach the cutting and winding portion 17. Therefore, this second additional embodiment is advantageous when the space on the front side of the hard object C is narrow and it is necessary to install the drive device D by bypassing the wire saw S.

In a third additional embodiment shown in FIG. 7, the direction changing device Y includes a pair of alignment pulleys 34 and 35 that are supported on a horizontal axis and arranged vertically, and a pair of alignment pulleys 34 and 35 that are also supported on a horizontal axis and arranged vertically. A pair of direction changing pulleys 36 and 37 are provided. Therefore, the wire saw S has a drive winding part 16 for the drive pulley 11.
After reaching the alignment pulleys 34 and 35, the direction is bent upward or downward at the direction conversion pulleys 36 and 37 and reaches the cutting hook 17. For this reason,
This third additional embodiment is advantageous when the hard object C is located at a higher or lower location than the installation position of the drive device D.

Therefore, these additional embodiments can be implemented in addition to the first to fourth embodiments.

〔Effect of the invention〕

According to the invention, the drive pulley 11 on the truck 10
An endless wire saw having a driving winding part 16 that is wound around the hard object C and a cutting winding part 17 that is wound around the hard object C is rotated in the circumferential direction by the driving pulley 11 while the trolley 10 is moved from the hard object C. In a method of cutting a hard object C by pulling the cutting winding part 17 with the wire saw in a tensioned state by traveling in a direction away from the wire, conventionally, the distance corresponds to the cutting dimension of the hard object C. However, as mentioned above, while the cart 10 is traveling, the distance traveled by the cart 10 is difficult or impossible. The winding drive unit 16 and the cutting winding part 17 are arranged so that the towing distance β of the cutting winding part 17 with respect to α is set to α<β.
This method is characterized by detouring a portion of the wire saw in a tensioned state between the wire saw and forcibly extending the detoured portion, so that the cutting dimension of the hard object C is made larger than the moving distance of the cart 10. As a result, even a long hard object C can be cut in a narrow working space.

[Brief explanation of drawings]

FIG. 1 is a side view showing a first embodiment of the present invention, FIG. 2 is a side view showing a second embodiment, and FIG. 3 is a side view showing a third embodiment of the present invention.
FIG. 4 is a side view showing the fourth embodiment, FIG. 5A is a side view showing the first additional embodiment, FIG. 5B is a plan view thereof, and FIG. 6A is a side view showing the fourth embodiment. 6B is a plan view of the second additional embodiment; FIG. 7 is a side view of the third additional embodiment; FIG. 8 is a side view of an example of a wire saw; FIG. 9 FIG. 2 is a side view showing a conventional example. S...Wire saw, C...Hard object, D...
Drive device, L...distance, T...detour portion, 8...
Base, 9... Rail, 10... Cart, 11... Drive pulley, 16... Drive winding part, 17... Cutting winding part, 20... Backward drive means, 21, 22, 2
9, 31... Auxiliary pulley, 24, 30, 33...
Auxiliary movement device, 25, 26...bend pulley.

Claims (1)

[Claims] 1. An endless wire saw having a drive winding part 16 that is wound around the drive pulley 11 on the trolley 10 and a cutting winding part 17 that is wound around a hard object is rotated in the circumferential direction by the drive pulley 11. In a method for cutting a hard object by moving the trolley 10 in a direction away from the hard object and pulling the cutting winding part 17 with the wire saw under tension: Cutting and wrapping part 1 for traveling distance α
A part of the wire saw under tension between the winding drive part 16 and the cutting winding part 17 is detoured so that the towing movement distance β of No. 7 becomes α<β, and the detoured part is forcibly moved. A method for cutting a hard object characterized by stretching it.