JP6747740B1 - How to cut and remove rubber bearings - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cut a rubber bearing with a diamond wire saw, heat generated by the cutting melts the rubber bearing and adheres to the diamond wire saw to lower the cutting ability, and heat generated during cutting ignites the rubber bearing. Prevent. SOLUTION: A diamond wire saw 2 is wound around a rubber bearing 1 to be cut, and a vortex tube 4 is arranged close to the cutting portion to supply cold air to the cutting portion and suppress a temperature rise due to frictional heat during cutting. To prevent the rubber from adhering to the diamond wire saw and prevent the rubber from igniting due to high temperature so that the cutting operation can be performed smoothly. The rubber bearing can be smoothly removed by cutting the steel plates 10 and 11 at the two upper and lower portions of the rubber bearing 1 with a diamond wire saw. [Selection diagram] Figure 1

Description

The present invention relates to a method for cutting and removing laminated rubber bearings such as bridges and viaducts for expressways.

Due to the deterioration of the rubber bearing installed between the lower structure and the upper structure, replacement work is required, and it is required to remove the existing rubber bearing and install a new rubber bearing instead. ..

As shown in FIG. 3, the rubber bearing 1 is a laminated body in which rubber layers 12 and hard plates (metal plates) 13 are alternately laminated, and the periphery of the laminated body is surrounded by a protective layer 14 such as rubber. Steel plates 10 and 11 for fixing to the upper structure and the lower structure are provided on the upper and lower sides.
Various rubbers such as natural rubber and chloroprene rubber are used for the rubber layer of the rubber bearing 1. A metal plate such as a steel plate is generally used as the hard plate 13, and materials such as ceramics and hard synthetic resin are used as the material of the other hard plates.
The rubber layer 12 has a thickness of about 4 to 15 mm, and the hard plate 13 such as a steel plate has a thickness equal to or thinner than that of the rubber layer 12 and about 2 to 10 mm.
The protective layer 14 on the side surface protects the metal plate of the hard plate 13 from corrosion damage. As the protective layer, chloroprene rubber, butyl rubber, halogenated butyl rubber, ethylene propylene rubber, urethane rubber having excellent weather resistance is used. , Silicone rubber, etc. are used.

Rubber bearings can be removed by removing concrete such as abutments and piers where the bearings are installed, exposing the anchor bolts that secure the rubber bearings, and cutting and removing the anchor bolts, using a diamond wire saw. A method of cutting and removing concrete on abutments and piers to expose the anchor bolts, and a method of cutting and removing abutment concrete with a water jet to cut and remove anchor bolts have been proposed.
Noise and dust will be generated if the concrete is smoked, so if there is a house or office building close to the road, such as an urban highway, it is not preferable because it will destroy the quiet environment. It is necessary to prevent the occurrence of dust and the diffusion of dust, which is costly and requires a long construction time.
In addition, the method of cutting the main body of the structure such as the abutment and pier will destroy the structure even if it is partial, so a defective part will occur in the structure, and after removing the rubber bearing, This requires repairing and restoring the structure to its original condition, which is time consuming and expensive.

JP, 2017-115323, A

INDUSTRIAL APPLICABILITY The present invention enables only the rubber bearing main body to be cut and removed with a diamond wire saw without touching the structures such as abutments and piers where the rubber bearing is installed. Since multiple steel plates are present in the rubber bearing, heat is generated when cutting them with a diamond wire saw, and this heat softens the rubber, and the softened rubber adheres to the wire saw and reduces the cutting function of the wire saw. At the same time, the attached rubber may be cooled and solidified to damage the pulley installed to guide the travel of the diamond wire saw, making the diamond wire saw inoperable.
In addition, cutting the upper and lower steel plates constituting the rubber bearing with a diamond wire saw causes a high temperature. Since the rubber constituting the rubber bearing is a carbon product, it ignites at high temperatures, so it is necessary to prevent ignition of the rubber without reducing the cutting speed.
Cooling with cooling water requires preparation of a water tank, and since muddy water containing chips after cutting is industrial waste, it requires costs such as requiring water treatment equipment.
The present invention provides a method for cutting and removing a rubber bearing with a diamond wire saw, in which the rubber does not adhere to the diamond wire saw and the rubber does not ignite due to high heat when cutting and removing the rubber bearing with a diamond wire saw. It is a thing.

The present invention is to cut the upper and lower steel plates provided above and below the rubber bearing when the diamond wire saw is wound around the rubber bearing to be cut and removed. , The diamond wire saw cuts into the rubber bearing of the object to be cut, and the exit where the diamond wire saw comes out of the rubber bearing, the vortex tubes are placed close to each other to supply cold air to the cut and exit. By suppressing the temperature rise, the diamond wire saw enables anhydrous cutting of the rubber bearing.
Further, a rail is installed on the rubber bearing so that the vortex tube can be moved as the cutting of the rubber bearing progresses, and the vortex tube is movably installed along the rail.

The vortex tube obtains cold air below -30°C by supplying compressed air, and if the compressor can be brought into the construction site for cutting and removal, it is possible to easily obtain cold air below -30°C. Even at construction sites such as viaducts and bridges, it is possible to intensively blow cool air to the cutting site, so it is possible to prevent the cutting site and the diamond wire saw from becoming hot, and to prevent rubber from adhering to the diamond wire saw and cutting. It is possible to prevent the rubber from being heated to a high temperature by frictional heat at the time and prevent the rubber from igniting, and it is possible to smoothly cut and remove the rubber bearing.
Since the cool air discharged from the vortex tube reaches only about 30 cm from the discharge port, attach a hose to the cool air outlet of the vortex tube and blow cold air to the cut part of the rubber bearing as the cutting progresses to cool the rubber. Also, since the rubber is not ignited and the rubber is melted by heat and adheres to the diamond wire saw to hinder the cutting ability, the rubber bearing can be smoothly cut and removed.

FIG. 5 is a plan view of the arrangement of the diamond wire saw in cutting the rubber bearing. Vortex tube (cooling device) layout conceptual diagram. Sectional drawing of a rubber bearing.

The present invention will be described based on FIG. 1 showing an embodiment of cutting work and FIG. 2 showing a schematic arrangement concept of a diamond wire saw and a vortex tube.
As shown in the arrangement plan view of the diamond wire saw 2 in FIG. 1, the diamond wire saw 2, the diamond wire saw driving device 3 and the vortex tube 4 are set.
The steel wire of the rubber bearing 1 is obtained by winding the diamond wire saw 2 around the steel plates 10 and 11 provided above and below the rubber bearing 1 shown by the arrow in the sectional view of the rubber bearing 1 of FIG. At the positions 10 and 11, the rubber bearing 1 is cut at two upper and lower positions. Either of the upper and lower steel plates 10 and 11 may be cut first.
The vortex tube 4 is arranged so that cold air is blown into the cutout opening 1 a through which the diamond wire saw 2 cuts into the rubber bearing 1 and the exit opening 1 b through which the diamond wire saw 2 comes out of the rubber bearing 1. The vortex tube 4 is connected to a compressor (not shown) by a high-pressure hose, and compressed air supplied from the compressor to the vortex tube 4 is converted into cool air and ejected toward the cutout opening 1a and the escape opening 1b.
A hose (not shown) is connected to the cold air discharge port of the vortex tube 4, and the cool air from the vortex tube 4 is directly injected into the cutting/cutting opening 1a of the rubber bearing 1, so that the diamond wire saw 2 and the steel plates 10 and 11 that have been cut. To cool.

As the diamond wire saw 2 moves toward the diamond wire saw driving device 3 along with the progress of the cutting of the steel plates 10 and 11 of the rubber bearing 1, the cutout opening 1a and the exit opening 1b of the diamond wire saw 2 move the vortex tube 4 into the cutout opening 1a. Also, the cooling air is moved in synchronism with the movement of the escape opening 1b so that the cut air 1a and the diamond wire saw 2 are sufficiently supplied to the escape opening 1b that escapes from the rubber bearing 1 to the outside.
As a result, the rubber bearing 1 is smoothly cut, the temperature of the rubber of the rubber bearing 1 is suppressed below the ignition point, and the rubber does not melt and adhere to the diamond wire saw 2, so that the cutting ability deteriorates. In addition, the driving pulley 3a and the direction changing pulley 3b were not damaged by the attached rubber, and the upper and lower steel plates of the rubber bearing 1 could be cut.

To facilitate moving the vortex tube 4 in synchronization with the movement of the cutting position of the diamond wire saw 2, rails for movement are installed on both sides of the rubber bearing 1, and the vortex tube 4 is automatically guided by the rails to automatically move the vortex tube 4 Alternatively, the construction can be efficiently performed by moving it manually.

1 Rubber bearing 2 Diamond wire saw 13 Hard plate (metal plate)
14 Protective Layer 1a Cutout 1b Exit 3 Diamond Wire Saw Drive 3a Drive Pulley 3b Direction Change Pulley 4 Vortex Tube

Claims (2)

Place the diamond wire saw on the steel plate of the rubber bearing, install vortex tubes in close proximity to the cut and cut openings and eject the cold air to cut with the diamond wire saw, and move with the cutting progress of the diamond wire saw. A method of cutting and removing the rubber bearing that cuts while moving the vortex tube so that cold air can be sprayed to the exit. The method according to claim 1, wherein rails are installed on both sides of the rubber bearing, and the vortex tube is movable along the rail.