JPS594036B2 - Edge cutting method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for cutting the edge between a required outer circumferential surface of a cylinder to be advanced into the ground and the ground.

When moving a wide cylinder forward into the ground with shallow soil cover, the soil on the top of the cylinder moves as the cylinder moves forward, making the ground surface uneven and requiring a huge forward force.

Conventional construction methods to solve this problem include: 1. Lay out long and thin friction cutters on the top of the cylinder, cut the edges of the top of the cylinder and the soil, advance the friction cutters one by one with a jack, and then move the cylinder forward. to prevent the soil from moving on the upper surface of the cylinder, or ■ insert a thin sheet-shaped edge cutting material rolled from the cutting edge into the upper surface of the cylinder as the cylinder moves forward to separate the upper surface of the cylinder and the soil. There is a method of cutting the edges, but in the first method, the friction cutter material at the top of the cylinder must be advanced over the entire length, which requires a lot of effort and labor costs, and sometimes the friction cutter material does not move. (The second method has the disadvantage that the sheet material may break or cut.)
There are disadvantages in that the sheet material cannot be fed, and as the cylinder moves forward, the sheet material forms a lump on the top surface of the cylinder, making it ineffective as an edge cutting material.

The present invention has been proposed in order to eliminate the above-mentioned drawbacks, and is an excellent invention that is economical and capable of reliably cutting the edge between the outer circumferential surface of the cylinder and the soil.

That is, in the present invention, a sturdy edge cutting material such as a steel plate piece (3.2 pieces to 9 pieces thick), a wood veneer piece, a synthetic resin plate, a hard rubber plate, etc. is attached to the required outer peripheral surface of the cylinder from the inside of the cutting edge. Using a cutting edge with a gap for insertion, rigidly join (welding, bolting, adhesive, etc.) strong and short edge cutting pieces one after another between the required outer circumferential surface of the cylinder and the soil.
As the cylinder moves forward, a continuous body of sturdy edge cutting pieces is left between the required outer peripheral surface of the cylinder and the soil to cut the edge of the required outer peripheral surface of the cylinder and the soil.

Hereinafter, the method and apparatus of the present invention will be explained using one embodiment and drawings.As shown in FIGS. 1 and 2, a cylinder body 1
The blade opening 2 is designed so that a sturdy edge cutting material 3 short piece (hard plate-like material such as iron plate, plywood, synthetic resin plate, etc.) can be inserted into the top surface.
The inner dimension of the upper surface is made slightly larger than the outer dimension of the cylinder 1 to create a gap 4 for inserting a short piece of edge cutting material 3, and as the cylinder 1 moves forward, the gap 4 is used from inside the cutting edge 1 to insert a steel plate, a thick plywood plate, etc. The three sturdy and short edge cutting pieces are rigidly connected to the already inserted short edge cutting pieces by welding, bolting, adhesive, etc., and when the cylinder body 1 is moved forward, the three short edge cutting pieces are attached to the upper surface of the cylinder body. It is inserted and left between the ground and the ground.

The edge cutting material 3 is stopped by a stopper member 5 on the starting side so that it does not move forward.

Also, by applying a lubricant such as grease to the lower surface of the edge cutting material, the cylinder body 1 and the edge cutting material 3 can slip easily, and the edge cutting material 3 on the upper surface, which is not coated with a slipping material, has poor slippage, so the cylinder body Even when the tube 1 is moved forward, a continuous body of three pieces of edge cutting material remains on the upper side, and the edge of the cylindrical body 1 and the soil is reliably cut.

As is clear from the above explanation, welding, bolting, or adhesives are used to attach pieces of sturdy materials such as steel plates, wood plates, synthetic resin plates, and hard rubber plates from the inside of the blade using small gaps, depending on the material. It is rigidly connected and inserted, and has the following advantages and effects.

(1) It is possible to reliably insert and leave a sturdy edge cutting piece around the cylindrical body with an easy operation.

(2) The continuum of edge cutting materials and short pieces left underground is made of hard materials such as iron, wood, synthetic resin boards, hard rubber boards, etc., so they will not turn over or break when the cylinder moves forward. (It will definitely be left underground.

(3) Therefore, movement of the upper earth and sand when the cylinder moves forward can be reliably prevented.

(4) Since the earth and sand at the top of the cylinder does not move, vehicles and trains can pass through without interfering with traffic above.

(5) Since the earth cover can be made shallow, the approach before and after can be shortened (the construction cost is low and the construction period can be shortened).

(6) The edge trimming material of the present invention is left in the ground and does not move, making it unnecessary to use mechanical equipment to move it by jacking or the like, making it economical.

(7) By leaving edge cutting materials on both sides of the cylinder as shown in Figure 3, the peripheral frictional resistance of the cylinder becomes smaller, allowing the cylinder to be advanced economically into shallow ground using small advancing equipment. You can also do it.

[Brief explanation of the drawing]

FIG. 1 is a side view showing one embodiment of the method and apparatus of the present invention;
FIG. 2 is a front view, and FIG. 3 is a front view showing another embodiment. 1...Cylinder body, 2...Blade mouth, 3...
...Edge cutting material, 4...Gap, 5...Stopping member.

Claims (1)

[Claims] 1. When advancing the cylinder into the ground, a short piece of sturdy edge cutting material is inserted into the gap between the required inner circumferential surface of the cutting edge and the outer circumferential surface of the cylinder, so that it becomes sturdy as the cylinder moves forward. It is characterized by rigidly joining short pieces of edge cutting material one after another, leaving a continuous body of sturdy short pieces of edge cutting material between the earth and the cylindrical body, and cutting the edge between the required outer peripheral surface of the cylindrical body and the earth. How to cut ties. 2. A cutting edge whose internal dimension is slightly larger than the external dimension of the cylinder so as to have a space for inserting a short piece of sturdy edge cutting material, and a sturdy blade that is rigidly connected to the required outer peripheral surface of the cylinder and inserted through the space. An edge cutting device comprising a group of edge cutting material short pieces.