JPH0468117B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a processing method for cutting workpieces such as concrete structures and steel materials by spraying ultra-high pressure water or ultra-high pressure water containing an abrasive. Specifically, the present invention relates to a waterjet cutting method for cutting a corner of a workpiece having a step.

<Conventional technology> Machining technology that utilizes water jet's destructive energy has been adopted for various cutting processes.
When performing cutting, it is necessary to place a receiving gutter on the back side of the workpiece in order to collect the cut water jet while preventing it from scattering and soundproofing it.

As shown in FIG. 4, the existing receiving gutter consists of a box A with a hat-shaped cross section, and has a structure in which a plurality of iron plates B, etc. are accommodated.

Cutting is performed by attaching this receiving gutter A to a workpiece along a planned cutting line with bolts or the like.

<Problems to be Solved by the Present Invention> The following problems exist in the conventional waterjet cutting technique described above.

In other words, if you want to cut a corner formed by wall C and beam D of a building, etc., the mounting surface of gutter A should be formed on the same plane, and the flange E should protrude to the outside. Therefore, it is very difficult to arrange the receiving gutter A in a state where it closes the corner where the cutting is scheduled.

Therefore, cutting is performed with the cutting position away from the corner.

As a result, a portion of the wall C remains on the bottom surface of the beam D that has been cut, so a great deal of effort is required to perform chiseling work.

<Objective of the present invention> The present invention has been made to solve the above-mentioned problems, and it is possible to easily install a catch gutter when cutting the corner of a workpiece, and to cut the corner. To provide a waterjet cutting method that can reliably close and further accurately cut along the boundary line of a corner.

<Configuration of the Present Invention> An embodiment of the present invention will be described below with reference to the drawings.

First, the gutter used in the present invention will be explained.

<A> Structure of the receiving gutter As shown in Figures 1 and 2, the receiving gutter 1 has a bottom plate 11.
It consists of two side plates 12 and a damping material 2.

<B> Bottom plate The bottom plate 11 is a plate body disposed across two surfaces forming the corner of the workpiece to be cut,
For example, it is formed by bending both sides of a belt-shaped steel plate into a V-shape.

The bent portion in a V-shape is defined as a flange 14.

The bending angle of both flanges 14 is
In principle, the inner angle of the intersecting plane formed by extending the outer surface of No. 4 is formed to be equal to the angle of the corner of the workpiece to be cut.

In this embodiment, a case where this angle is formed at a right angle will be explained.

Furthermore, a sealing material 3 such as a rubber plate is attached to the outer surface of the flange 14 that is scheduled to come into contact with the workpiece.

<C> Side Plate At both ends of the bottom plate 11 in the longitudinal direction, side plates 12 formed by cutting a steel plate into triangles are provided.

This side plate 12 is a closing plate whose purpose is to close both ends of a closed space formed when the receiving gutter 1 is attached to a corner of a workpiece, as will be described later.

Further, the bottom plate 11 or the side plate 12 is configured to pass through and guide a hose extending from a vacuum pump (not shown) to collect ultra-high pressure water containing abrasives, cutting waste, etc. discharged into the receiving gutter 1. do.

<D> Damping material A damping material 2 such as L-shaped steel is fixed between the opposing side plates 12.

The damping material 2 is dimensioned so that it does not protrude from the side plates 12, and is attached with the troughs 21 arranged in a direction approaching the bottom plate 11.

This damping material 2 is a member whose purpose is to dampen the destructive energy of the water jet after cutting the workpiece.

Next, a cutting method using a water jet will be described, taking as an example the case of cutting along a boundary line having a step between a wall C and a beam D. (1st, 3rd
Figure) (1) Installation of gutter Figure 3 shows a vertical cross-sectional view of the house to be cut.

C is a wall that separates two rooms 4 and 5, and D
is a beam wider than wall C.

Further, the surface of the wall C on the room 4 side and the surface of the beam D are formed as the same flat plane, while the bottom surface of the beam D protrudes from the top of the wall C on the opposite side of the room 5.

In order to cut the wall C in the horizontal direction to match the bottom surface of the beam D, first cut the receiving gutter 1 of the structure described above at the corner that is the boundary between the wall C on the room 5 side and the beam D.
, and fix the 14 flanges that contact wall C and beam D with anchor bolts or the like.

As a result, the corner space formed by the wall C and the beam D is sealed by the receiving gutter 1.

(2) Arrangement of the nozzle device On the other hand, the nozzle device 6 is arranged in the room 4 so that it can move horizontally along the bottom surface of the beam D.

This nozzle device 6 is a known cutting device that sprays ultra-high pressure water and abrasive material at high speed.

Note that this nozzle device 6 is provided with various protective measures for soundproofing and preventing water jet from scattering.

(3) Start of cutting Start jetting ultra-high pressure water containing abrasive from the nozzle device 6, and at the same time run it horizontally to cut the beam D.
Proceed to cut along the very edge of the bottom surface.

The ultra-high pressure water containing the abrasive material that has penetrated the wall C collides with the damping material 2 of the receiving gutter 1 and is attenuated, and is then discharged to the outside together with cutting waste.

In this way, since the receiving gutter 1 can be disposed at the corner formed by the wall C and the beam D, the ultra-high pressure water containing the abrasive can be sprayed very close to the bottom of the beam.

Therefore, the wall C remaining on the bottom surface of the beam D can be kept to a very small amount so that chiseling work is not required.

<Effects of the Present Invention> Since the present invention is as described above, the following effects can be achieved.

(b) Since the gutter can be placed so as to close the corner with a step, it is possible to get close to the edge of the corner boundary and cut accurately.

Therefore, there are no uncut parts like in the past,
There is no need to perform chiseling work that requires a lot of effort.

(b) The hem of the gutter is formed so as to be in close contact with the plurality of planes forming the corners to ensure a closed space.

Therefore, the installation is easy, as all that is required is simply fixing the receiving gutter to the corner where the cut is to be made.

(c) It can be used to cut corners of various members formed by joining surfaces.

[Brief explanation of drawings]

Figure 1: An explanatory diagram of an embodiment of the present invention, Figure 2:
An explanatory diagram of a receiving gutter, FIG. 3: An explanatory diagram of the arrangement state of a receiving gutter and a nozzle device, and FIG. 4: An explanatory diagram of a prior art.

Claims (1)

[Scope of Claims] 1. When cutting a corner of a workpiece by jetting ultra-high pressure water or ultra-high pressure water containing an abrasive at high speed, a bottom plate that traverses between two surfaces forming the corner; A receiving gutter consisting of side plates protruding from both ends of the bottom plate and a damping material fixed to one side of the bottom plate is used, and the receiving gutter is fixed to the corner of the workpiece to form a closed space. , A water jet cutting method characterized by cutting by spraying ultra-high pressure water or ultra-high pressure water containing an abrasive at high speed from the back side of a fixed receiving gutter.