JPH08199669A - Cutting tool and cutting method for bar, and ditch cover using them - Google Patents

Abstract

PURPOSE: To easily operate, simplify tools and devices, and the like used for manufacture, restrain consumption of consumable goods so as to reduce running cost, and prevent generation of chip on the cutting section, in manufacturing a ditch cover. CONSTITUTION: In a cutting tool 11 for cutting off the end part of a bar 4 used for structural material as a surplus part 4a, it is formed into a nearly pipe-like shape, and the size of the end face opening of the pipe-like tool is formed so that it can be freely inserted to the surplus part 4a and play at inserting is small. When the cutting tool 11 is inserted to the surplus part 4a, the length of the tool is set so that the surplus part 4a can be bent by lever action while setting the end part on the inserting part side of the cutting tool 11 as the fulcrum and the other end as the point of force, and the mechanical strength of the tool is set so as to serve as the lever bending the surplus part 4a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is applicable to manufacturing a structure,
Regarding a tool and a cutting method for cutting an excessive portion of an end portion of a bar used for a structural material, particularly a tool and a cutting method for a girder when the structure is a groove lid, and a groove using these Regarding the lid.

[0002]

2. Description of the Related Art When manufacturing a grid-shaped groove cover 1 as shown in FIG. 1, a generally rectangular outer frame 2 (end plate) is used.
A large number of beam members 3 (I material etc.) are laid in parallel and crossed over this, and a large number of bar-shaped girder members 4 (twist bar etc.) are also laid in parallel and welded. ing. Further, the outer frame 2 and the beam member 3 are provided with a recess 5 for accommodating the bridge member 4 spanned therein so that the outer frame, the beam member and the upper side portion of the beam member are substantially flush with each other. .

For this girder material, steel such as SS41 is used, and specifically, a quadrangular prism having a side of 5 to 8 cm or a hexagonal prism of the same size twisted (twist bar) is often used. . Further, at this time, it is difficult to prepare a girder material having the same length as the bridging width L of the outer frame.
A little longer girder material is welded, and then the surplus portion 4a (generally several cm to several tens cm) of this girder material that protrudes outside the outer frame as shown in FIG. 2 is cut. There is. Then, the surplus portion of the girder material is cut by gas cutting, grinder cutting, press cutting, or the like. Particularly in the case of gas cutting or press cutting, jagged debris remaining on the cut surface after cutting is ground by a grinder.

[0004]

However, gas cutting is burdensome for gas charges, preparation of gas equipment such as a gas cylinder, and routing of gas pipes, and it is necessary to manage fire and gas leakage. Also, press cutting requires a large-scale device, and raising and lowering the groove lid to and from the press cutting device is troublesome. In particular, a press cutting device for a long groove lid, which has a length of several meters, has a heavy load on the size of the device, the installation place, and the operation. Further, in both the gas cutting and the press cutting, cutting surface polishing after cutting is required as a post-work.
In this respect, in the grinder cutting, the cutting surface can be polished at the same time as the cutting, but the grindstone replacement work occurs regularly, and the grindstone must be replenished as a consumable item. Further, the cutting work itself is slow because it is cut while being ground with a grinder, which is troublesome.

In some cases, it is desired to use a hard material for the girder material, but there has been a problem that the cut surface is cut off when the hard material girder material is cut by a grinder or a press.

In view of the above-mentioned problems, an object of the present invention is to facilitate the work when manufacturing the groove lid, simplify the tools and devices used for the manufacture, and suppress the consumption of consumables. Accordingly, it is an object of the present invention to provide a rod cutting tool and a cutting method that can reduce running costs and prevent chipping of a cut surface, and a groove lid using the same.

[0007]

In order to solve the above-mentioned problems and to achieve the object, the invention according to claim 1 is "cutting for cutting an end portion of a bar material used as a structural material as an excess portion. The cutting tool has a substantially pipe-like shape, and the size of the substantially pipe-shaped end face opening is such that it can be freely inserted into the surplus portion and has little play at the time of insertion. When the is inserted into the excess portion, the end of the cutting tool on the insertion opening side is used as a fulcrum, and the other end is used as a force point. It has the mechanical strength that serves as a lever for bending. "

The "substantially pipe material" may have a rectangular cross section as well as a rectangular cross section, and the one having a length longer than the surplus portion is more suitable according to the principle of leverage described later. The "mechanical strength of the lever" means the hardness that allows the lever to be flexed to the extent that the force applied to the force point does not hinder the lever movement. In addition, the vicinity of the insertion opening side end of the cutting tool may be chipped due to concentration of force.
This is the strength that does not cause bending or deformation.

The invention according to claim 2 is the means according to claim 1, wherein "the bar member is a girder member bridged over an outer frame of the groove lid, and the surplus portion is of this outer frame. It is a surplus portion that protrudes outside. " The "tooth portion" may be a ridge or projection provided inward of the end face opening and provided along the inner circumference of the end face opening, and is preferably harder than the girder material.

The invention according to claim 3 provides the means according to claim 1 or 2, wherein "a tooth portion is provided in an end face opening of the cutting tool on the fulcrum side".

According to a fourth aspect of the present invention, there is provided a "cutting method for cutting an excessive portion of an end portion of a rod when the rod of the structural member is bridged and fixed, and the rod is hung between predetermined members. Along with passing, when a bar longer than this bridging width is hung and fixed, one end of the pipe member is inserted into the surplus portion of the bar protruding to the outside between the predetermined members. The main point is to fold and cut the vicinity of the fulcrum of the previous surplus portion by levering the end of the pipe material on the insertion opening side as a fulcrum and the other end of the pipe material as a force point.
The "substantially pipe material" may be the cutting tool according to any one of claims 1 to 3.

According to a fifth aspect of the present invention, in the means according to the fourth aspect, "the predetermined member is an outer frame of the groove lid,
The gist is that the bar is a girder laid over this outer frame. "

The invention according to claim 6 is "a groove lid,
The girder material longer than the bridging width is hung on and fixed to the outer frame of the groove lid, and when the surplus portion of the girder material protruding to the outside of the outer frame is cut, any one of claims 1 to 3 The surplus part was cut by the cutting method by the means according to claim 4 or 5 by using the cutting tool by the means according to 1).

[0014]

According to the above, according to the invention of claim 1, when the operation is divided, as shown in FIG. 3B, the cutting tool uses the end on the insertion opening side as the fulcrum 20 and the tip of the excess portion. The vicinity is the point of action,
It is a lever with the other end of the cutting tool as the force point 21. Further, since the surplus portion is inserted into the cutting tool having a substantially pipe shape, only the root of the surplus portion can be bent . Therefore, the small force of the person added to the force point is at the root of the surplus part.
Focus as a big force. Therefore, the surplus part breaks from the root and is cut securely and easily.
It

According to the experiments by the applicant, the diameter is about 10 m.
Approximately 50c in the excess part of the bar made of SS41 steel of m
Insert a m-length, substantially pipe-shaped cutting tool, and insert the other end of the cutting tool into
I was able to cut it by pushing and pulling it about 2 times with the normal force of an adult.

In addition to the function of claim 1, the invention of claim 2 is such that, as shown in FIG. 5, the stress P against the bending force F applied to the surplus portion is obtained from the outer frame, and the force for bending the root is obtained. The concentration of can be strengthened.

According to the invention of claim 3, in addition to the actions of claims 1 and 2, since the bending of the root is strengthened by the teeth, the cutting force is increased.

The invention according to claim 4 is the invention according to claims 1, 2, and 3.
Similar to the action of, the lever part bends only the root of the excess part of the bar material, so the bending force can be concentrated at this root, and the other end of the pipe material is twisted 2-3 times. If this is done, the surplus part of the girder can be broken from the root and cut.

According to the fifth aspect of the invention, similarly to the action of the fourth aspect, the surplus portion of the girder can be broken and cut from the root by the lever force.

According to the sixth aspect of the invention, similarly to the actions of the fourth and fifth aspects, the excessive force of the lever causes the surplus portion of the girder material to be broken from the root, which speeds up the manufacturing of the groove lid. Further, the device / tool for manufacturing can be simplified, and a groove lid capable of suppressing consumables used for manufacturing can be obtained.

[0021]

【Example】

(Example 1) Using the cutting tool according to claim 2,
The groove lid according to claim 6 manufactured by carrying out the cutting method described below is shown below. In addition, this embodiment indirectly shows an embodiment of the cutting tool according to claim 1 and the cutting method according to claim 4.

As shown in FIG. 1, this embodiment is a groove cover 1 for a general gutter, and a rectangular outer frame 2 has a beam member 3 of about 35 mm made of an I-shaped member laid across in the width W direction. It is provided at a pitch, and crosses over it, and three girder members 4 by twist bars are bridged in the groove cover length L direction. Further, the outer frame 2 and the beam member 3 are provided with a recess 5 for accommodating the girder member 4,
The outer frame 2, the beam member 3, and the upper portion of the girder member 4 are arranged to be substantially flush with each other.

In the process of manufacturing such a groove lid 1, the beam member 3
The process of bridging the girder material to the semi-finished product of the groove lid 1 which has been completed is described below.

As shown in FIG. 2, the semi-finished product of the groove lid 1 is provided with three recesses 5 for the girder material 4, which are longer than the length L of the lid 1. 4 is stored in each and fixed by welding. In this way, the groove lid 1 is such that the surplus portions 4a of the girder member 4 are projected at three positions at both ends outside the outer frame.

Next, the length is about 50 cm and the diameter is about 15 m.
Prepare a cutting tool 11 using an m steel pipe, and FIG.
As shown in FIG. 3, the groove cover 1 is inserted into the surplus portion 4a. Insertion is performed up to the root of the surplus portion, and as shown in FIG. 3B, the other end of this cutting tool is held with one hand and pushed and pulled several times. In this way, the surplus portion 4a can be easily bent from the root by the lever force. And
By focusing such bending force at the root, the cutting tool 1
If the other end of 1 is swung 2-3 times, the surplus portion of the beam 4 is broken from the root, and the beam can be easily cut. Since the cutting surface is jagged with broken chips protruding, it can be completed by lightly grinding with a grinder.

(Embodiment 2) Next, an embodiment of the cutting tool according to claim 3 will be described. As shown in FIG. 4, the cutting tool 12 is a cutting tool having a cylindrical cross-section with a tooth portion 13 provided at one end opening. This tooth portion 13 is provided with a ridge along the inner circumference of the end face opening of the cutting tool 12. In other words, one end face opening of the cutting tool is closed, and a hole that is slightly smaller than the cylinder is provided here. It is like that. With such tooth portions 13, the bending angle of the root of the surplus portion is strengthened, and accordingly, the bending is also strengthened, so that cutting can be performed more easily. Others are the same as those in the first embodiment and will not be described.

[0027]

As described above, according to the invention of the present application, it is possible to quickly perform the cutting process of the surplus portion in the bar material of the structural material and specifically in the girder material of the groove lid. This can be performed earlier than any of gas cutting, grinder cutting, and press cutting, even in comparison including finishing of the cut surface by grinding. In addition, the device / tool for cutting can be simplified. Furthermore, it is possible to suppress the consumables and the like necessary for cutting. For example, no gas is required for gas cutting, and there is an effect that it is possible to suppress replacement of a grindstone for cutting a grinder. In addition, it is possible to obtain an effect that the end portion of the girder material, which is seen in press cutting or grinder cutting, does not occur.

[Brief description of drawings]

FIG. 1 is a perspective view of a groove lid according to a first embodiment.

FIG. 2 is a partially exploded perspective view of the groove lid of FIG.

FIG. 3 is a diagram showing a cutting tool according to claim 2 and a cutting method according to claim 4 using the cutting tool.

FIG. 4 is a cutaway perspective view of a cutting tool including a tooth portion according to claim 3;

FIG. 5 is a diagram showing an acting force applied to a girder member and a stress from an outer frame corresponding thereto when the cutting tool according to claim 2 is used.

[Explanation of symbols]

 1 Groove Cover 2 Outer Frame as "Predetermined Member" 3 Beam Material 4 Girder Material as Bar Material 4a Excessive Part 5 Recess 11 Cutting Tool 12 Cutting Tool with Teeth 13 Teeth 20 Support Point 21 Force Point

Claims (6)

[Claims] 1. A cutting tool for cutting an end portion of a bar material used as a structural material as a surplus portion, which has a substantially pipe shape, and the size of the substantially pipe-shaped end face opening is the above-mentioned. It can be freely inserted into the surplus part and has a size with little play at the time of this insertion, and when this cutting tool is inserted into the surplus part, the end on the insertion opening side of this cutting tool is used as a fulcrum, A cutting tool having a length that allows the surplus portion to be bent by levering with an end as a force point, and mechanical strength that serves as a lever for bending the surplus portion. 2. The bar member is a girder member bridged over the outer frame of the groove lid, and the surplus portion is a surplus portion protruding to the outside of the outer frame. Cutting tool described. 3. An end face opening on the fulcrum side of the cutting tool,
The cutting tool according to claim 1 or 2, wherein a tooth portion is provided. 4. A cutting method for cutting an excessive portion of an end portion of a rod when the rod of a structural material is bridged and fixed, the bridge being bridged between predetermined members and the bridge width. When a longer rod is hung and fixed, the one end of the substantially pipe member is inserted into the surplus portion of the rod member protruding to the outside between the predetermined members. A cutting method, characterized in that the end of the pipe material is pivotally moved with the other end of the pipe member as a fulcrum to bend and cut the surplus portion near the fulcrum. 5. The cutting method according to claim 4, wherein the predetermined member is an outer frame of the groove lid, and the bar member is a girder member bridged over the outer frame. 6. A groove lid, wherein a girder material longer than the bridging width is hung and fixed to an outer frame of the groove lid, and an excess portion of the girder material protruding outside the outer frame is cut. In doing so, a groove lid characterized in that the cutting tool according to any one of claims 1 to 3 is used to cut an excess portion by the cutting method according to claim 4 or 5.