JPH058117A - Connecting method and connection construction of wire saw ends - Google Patents

Abstract

PURPOSE:To protect a connection part to prevent wear by inserting one end of a wire rope into a double heat-shrinking tube, connecting both ends to each other with a connecting tool, moving the double heat-shrinking tube onto the fixing tool, and heating to fit it closely to the fixing tool. CONSTITUTION:The one end 26a of a wire rope 26 of a wire saw 24 is inserted into a double heat-shrinking tube 44 like a double heat-shrinking tube 38 of the wire saw 24 to connect the end 26a of the wire saw 24 to that 26b of it. Also the ends 26a and 26b of the wire rope 26 are crimped by a fixing tool 46 for connection. Then the double heat-shrinking tube 44 is slid to a position where the fixing tool 46 is covered by it. The double heat-shrinking tube 44 is then heated for contraction to fit closely to the outer peripheral surface of the fixing tool 46.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for connecting an end portion of a wire saw used for cutting a structure made of stone, concrete, reinforced concrete and the like, and a connection structure.

[0002]

2. Description of the Related Art In recent years, as a means for cutting and dismantling stone materials, reinforced concrete structures such as buildings and bridges,
The cutting method using a wire saw is drawing attention.

An example of this type of wire saw will be described with reference to FIG. In the wire saw 2 of the same figure, a plurality of cylindrical beads 10 are fitted at predetermined intervals on a wire rope 4 which is a large number of twisted wires made of metal, and a resin, rubber, or the like is placed between the beads 10. It is configured by interposing spacers 12 ... Which are made of a flexible material. The beads 10
Is a sleeve (base metal) 6, and an abrasive grain layer 8 for cutting formed of diamond abrasive grains and the like formed on the outer peripheral portion of the sleeve 6.
It consists of and.

In order to perform cutting with this wire saw 2, as shown in FIG. 4, after winding the wire saw 2 around the object to be cut 14, it is attached to the pulley 18 of the drive unit 16 and this pulley 18 is rotationally driven. 1000 wire saw 2
The workpiece 14 is cut by the abrasive grain layer 8 of the wire saw 2 by traveling at a high speed of up to 1800 m / min. In addition, the drive device 16 is mounted on the table 2 on which the drive device 16 is installed.
The upper part of 0 is retracted with respect to the object to be cut 14 as the cutting progresses.

The connection of both ends of the wire saw 2 is shown in FIG.
In this state, one end and the other end of the wire rope 4 are fitted into a cylindrical stopper metal fitting 22 and are opposed to each other with a slight gap therebetween.
Both ends of the wire rope 4 are connected by caulking a and 22b.

[0006]

In the conventional wire saw 2 as described above, a fastener for joining both ends of the wire saw 2 (wire rope 4) due to abrasion with the object to be cut during cutting. 22 has a drawback that it is easily worn, and it has been desired to strengthen the connection portion of this wire saw. The present invention aims to solve such problems.

[0007]

A method for connecting an end portion of a wire saw according to the present invention comprises an inserting step of inserting a wire rope into a heat-shrinkable tube from one end, and joining one end and the other end of the wire rope with a joining member. And a sliding step of sliding the heat-shrinkable tube inserted in the inserting step to cover the outer peripheral surface of the joint portion of the wire rope, and heating the heat-shrinkable tube to heat the heat-shrinkable tube to the wire. And a heating step of bringing the rope into close contact with the outer peripheral surface of the joint. In addition, in the end connection structure of the wire saw, one end and the other end of the wire rope are joined by a joining member, and a heat-shrinkable tube is attached to the outer peripheral surface of these joined portions.

[0008]

In the wire saw end connecting method according to the above-mentioned structure, the heat-shrinkable tube sheathed on the wire rope in the inserting step shrinks in the heating step, and the outer peripheral surface of the wire rope is joined in the joining step. It adheres closely to.
This strengthens the joining of both ends of the wire rope and prevents wear of the connecting portion during cutting.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. In the figure, the wire saw 24 has a plurality of beads 32 ... Attached to the outer peripheral portion of the wire rope 26 at intervals from each other before connecting the end portions. The heavy heat shrinkable tube 38 is closely attached without a gap (Fig. 2
reference). The beads 32 include a cylindrical sleeve 28,
The sleeve 28 has an abrasive grain layer 30 formed by fixing abrasive grains such as diamond or CBN to the outer periphery of the sleeve 28 by metal bonding or electrodeposition. The end portion of the sleeve 28 is caulked to form the wire rope 26. It is fixed to.
The double heat shrinkable tube 38 is made of polystyrene,
An inner layer 34 made of a thermoplastic material such as polyamide or polyolefin, and a heat-shrinkable material such as polyethylene resin, vinyl chloride resin, vinylidene fluoride resin, ethylene vinyl acetate resin, ethylene ethyl acrylate copolymer, ethylene propylene rubber, or silicone rubber. And the outer layer 36.

The ends 26a, 26 of the wire saw 24
In order to connect b, first, the double heat shrinkable tube 3
The wire rope 26 is inserted into the double heat-shrinkable tube 44 similar to that shown in FIG. 8 from the one end 26a in the direction of arrow B in FIG. The double heat-shrinkable tube 44, unlike the double heat-shrinkable tube 38, is not heat-treated yet.

Next, as in the case of FIG. 5 described above, one end 26a and the other end 26b of the wire rope 26 are fitted into a cylindrical stopper (joining member) 46, and both ends are attached. Finally, the one end 26a and the other end 26b are joined (joining step).

Next, the double heat-shrinkable tube 44 described above is slid with respect to the wire rope 26 toward the end side, that is, in the direction of arrow B in FIG. The outer peripheral surface of 46 is covered (slide step). At this time, the double heat-shrinkable tube 44 is still cylindrical, and there is a slight gap between the inner peripheral surface of the double heat-shrinkable tube 44 and the outer peripheral surface of the stopper 46.

Thereafter, the double heat-shrinkable tube 44 is heated from the outside so that the double heat-shrinkable tube 44 is shrunk and brought into close contact with the cylindrical member 40 so as to cover the outer peripheral surface thereof (heating step). At this time, the inner layer 40 is brought into a softened state by heating, and the outer layer 42 that contracts is brought into close contact with the outer peripheral surface of the stopper 46. Through the above steps, the one end 26a and the other end 26b are connected, and the state shown in FIG. 1 is obtained.

According to the above method for connecting the end portions of the wire rope, the wire saw 2 can be operated by the simple operation as described above.
4 (the wire rope 26) can be protected from abrasion during cutting. The heat-shrinkable tube only needs to have a length that covers the connection portion, and does not require a special device such as a mold for the work, so the work cost is low. Further, according to such an end connection structure, even if the operator holds the connection part, the operator is not injured and the safety is improved. Furthermore, the type of the wire saw 24 can be displayed at low cost by properly selecting the color of the double heat-shrinkable tube 44 to be coated according to the performance of the beads (eg, abrasive grain size, application, etc.), the length of the wire saw 24, and the like. And can be done effectively.

In the above-mentioned embodiment, the double heat-shrinkable tube is attached to the joint portion of the wire rope. However, even if the heat-shrinkable tube has a single layer, the heat-shrinkable tube having a multilayer structure of three or more layers can be used. It may be a shrink tube. When the number of layers is two or more, the inner layer may be a tube made of a thermoplastic material or a tube made of a heat-shrinkable material. However, in order to improve the adhesion, a multilayer structure is preferable, and a tube made of a thermoplastic material is preferably used for the inner layer.

[0016]

As described above, according to the present invention, the wire rope is inserted into the heat shrinkable tube from one end, the one end and the other end of the wire rope are joined, and then the heat shrinkable tube is slid. By covering the outer peripheral surface of the joint part of the wire rope and heating the heat shrinkable tube, the connection part of the wire saw (wire rope) can be protected from abrasion during cutting, and the work cost can be reduced. Is also small. Further, even if the worker holds the connecting portion, the worker is not injured and the safety is improved. Furthermore, by selecting the color of the heat-shrinkable tube to be used according to the performance of the beads (for example, abrasive grain size, application, etc.) and the length of the wire saw, the type of wire saw can be displayed at low cost and effectively. It has an excellent effect that it can be performed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a connection state of end portions of a wire saw according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a method of connecting the ends of the wire saw according to the embodiment.

FIG. 3 is a cross-sectional view showing a conventional wire saw.

FIG. 4 is a diagram showing a usage example of a wire saw.

FIG. 5 is a cross-sectional view showing a connected state of an end portion of a conventional wire saw.

[Explanation of symbols]

26 wire rope 30 Abrasive layer for cutting 32 beads 44 heat shrink tube

Claims (2)

[Claims] 1. A method for connecting an end portion of a wire saw, wherein a plurality of substantially cylindrical beads each having a cutting abrasive grain layer provided on the outer peripheral portion of the wire rope are attached to the outer peripheral portion of the wire rope at intervals. An inserting step of inserting the wire rope into the heat shrink tube from one end, a joining step of joining one end and the other end of the wire rope with a joining member, and sliding the heat shrink tube inserted in the inserting step, A wire comprising a sliding step of covering the outer peripheral surface of the joint portion of the wire rope, and a heating step of heating the heat-shrinkable tube to bring the heat-shrinkable tube into close contact with the outer peripheral surface of the joint portion of the wire rope. How to connect the ends of the saw. 2. An end connecting structure for a wire saw, wherein a plurality of substantially cylindrical beads, each having a cutting abrasive grain layer provided on the outer peripheral portion thereof, are mounted on the outer peripheral portion of the wire rope at intervals. An end connection structure for a wire saw, wherein one end and the other end of the wire rope are joined by a joining member, and a heat shrinkable tube is attached to the outer peripheral surfaces of these joined portions.