JP6885823B2 - Bottom muscle curvature correction method and placement defect correction method - Google Patents

Description

The present invention relates to the correction of deformation of the bottom muscle included in the truss muscle, and particularly to the correction of improper placement of the truss muscle.

It is often pointed out that the construction industry in Japan is significantly delayed in improving productivity compared to other industrial fields. For example, from the Cabinet Office "National Accounts", the Ministry of Internal Affairs and Communications "Labor Force Survey", and the Ministry of Health, Labor and Welfare "Monthly Labor Statistics Survey", the productivity in 2013 is 4317 yen / person hours for all industries and 5412 yen / person for the manufacturing industry.・ While it is time, the construction industry is only 2638 yen / person time.

Among the construction industry, the labor-intensive work in concrete work includes 1) assembly of reinforcing bars, 2) assembly of formwork, and 3) compaction of concrete. Needless to say, improving these productivity is directly linked to improving the productivity of the construction industry.

In terms of fatal accident rate, the construction industry also shows a high value in all industries. In 2014, the "thousands of people ((annual casualties / annual average number of workers) x 1000)" of all industries is slightly over 2, while the construction industry reaches 5.

Furthermore, according to the long-term vision of the Japan Federation of Construction Contractors (Nikkenren), 1.28 million technicians are scheduled to leave their jobs.

Therefore, in order to deal with these problems, it is necessary not only to actively utilize the precast method but also to improve the efficiency of on-site casting.

When performing on-site casting, the truss reinforcement manufactured at the factory is brought to the site together with the precast material manufactured at the factory. Then, a concrete floor is formed together with the precast material, truss reinforcements are arranged on the concrete floor, and the top reinforcements of the precast material and the top reinforcements of the truss reinforcements are joined to form a reinforcing bar structure. After that, concrete is poured to form the floor of the building.

However, although truss muscles are manufactured in factories, they may shrink due to the manufacturing process and the external environment. As a result, the bottom muscles of the truss muscles are twisted, and the two bottom muscles may not be stably grounded. When this happens, placing the truss reinforcement on the concrete floor causes rattling, causing defects when joining the top reinforcement of the precast material and the top reinforcement of the truss reinforcement or when pouring concrete, and placing it on the top reinforcement. The practitioner may judge that the upper end muscle is not stable. As a result, the truss muscles brought in as defective products are returned to the factory and the yield deteriorates. In addition, skilled workers are required to prevent such deterioration of yield.

There is also a prior document that examines the deterioration of the yield of truss muscles. In Japanese Patent Application Laid-Open No. 2002-047754 (Patent Document 1), a spiral formwork plate is formed, a plurality of main reinforcements are temporarily provided in the longitudinal direction of the formwork plate, and the formwork plate is surrounded by the frame reinforcement body. It prevents defective products from being generated by placing and engaging in a space.

JP-A-2002-047754

However, when making a spiral formwork plate, it is necessary to have specifications that differ depending on the site. If this is allowed, it will be difficult to standardize, which goes against the improvement of productivity.
One of the objects of the present invention is to provide a construction method for improving the yield of truss muscles by a simpler means.
The above and other objects and novel features of the present invention will become apparent from the description and accompanying drawings herein.

A typical method for correcting bottom muscle curvature according to the present invention relates to a truss muscle including a lattice muscle that curves on a wave and a bottom muscle that is welded to the lattice muscle at two or more points. It is characterized by cutting one welding point of a bottom muscle and a lattice muscle.

This bottom muscle curvature correction method may be characterized in that the purpose is to eliminate the elongation of the lattice muscle.

This bottom muscle curvature correction method may be aimed at correcting the attachment angle of one welding point.

Another typical method for correcting the curvature of the bottom muscle according to the present invention relates to a truss muscle including a lattice muscle curved on a wave and a bottom muscle welded at a certain welding point with the lattice muscle. It is characterized in that the bottom muscle is cut at one place other than the welding point.

Another typical method for correcting the curvature of the bottom muscle according to the present invention relates to a truss muscle including a lattice muscle curved on a wave and a bottom muscle welded at a certain welding point with the lattice muscle. The bottom muscle is cut at one place other than the welding point, and the lattice muscle is cut at one place other than the welding point.

Another typical method for correcting the curvature of the bottom muscle according to the present invention relates to a truss muscle including a lattice muscle curved on a wave and a bottom muscle welded at a certain welding point with the lattice muscle. It is characterized in that the bottom muscle is cut at two or more places other than the welding point.

These bottom muscle curvature correction methods may be characterized in that the purpose is to eliminate the elongation of the bottom muscle.

A typical method for correcting improper placement according to the present invention is a first lattice muscle curved on a wave, a first bottom muscle welded to the lattice muscle at one or more points, and a second bottom muscle. The first bottom muscle and the second bottom muscle are curved truss muscles, and are characterized by cutting one welding point between the first bottom muscle and the first lattice muscle. And.

Another typical method for correcting improper placement according to the present invention is a first lattice muscle that curves on the wave, a first bottom muscle that is welded to the lattice muscle at one or more points, and a second. It relates to a truss muscle in which the first bottom muscle and the second bottom muscle are curved, including the bottom muscle, and cuts a portion other than the welding point of the first bottom muscle and the first lattice muscle. It is characterized by that.

Another typical method for correcting improper placement according to the present invention is a first lattice muscle that curves on the wave, a first bottom muscle that is welded to the lattice muscle at one or more points, and a second. It relates to a truss muscle in which the first bottom muscle and the second bottom muscle are curved, including the bottom muscle, and is characterized in that the lattice muscle is cut at one place other than the welding point.

These imposition correction methods may also be characterized in that the curvature of the second bottom muscle is also corrected.

According to the present invention, the defect rate of the truss muscle delivered to the site is reduced, and as a result, the yield is improved. As a result, the management of the truss muscle maker can be rationalized, and the construction personnel who are the users will not be deprived of unnecessary man-hours.

It is a perspective view of the truss muscle which concerns on this invention. It is a side view of an ideal truss muscle. It is a side view which shows the truss muscle 200 which caused the problem assumed in the 1st and 2nd Embodiment of this invention. It is a side view of the truss muscle which cut the point A. It is a side view which shows the method of eliminating the elongation of the lattice muscle of the 2nd Embodiment of this invention. It is a side view which shows the truss muscle which caused the problem assumed in the 3rd Embodiment of this invention. It is a side view which shows the method of eliminating the stretch of the bottom muscle of the 3rd Embodiment of this invention. It is a side view which shows the method of eliminating the stretch of the bottom muscle and the lattice muscle of another embodiment of this invention. It is a side view which shows the method of eliminating the stretch of the bottom muscle of another embodiment of this invention. It is a side view which shows the method of eliminating the shrinkage of the bottom muscle of another embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Outline of truss muscle)
FIG. 1 is a perspective view of a truss muscle according to the present invention.
The truss muscle is composed of five components, a top muscle 101, a bottom muscle 111, 112, and a lattice muscle 121, 122.

The top reinforcing bar 101 is a reinforcing bar that serves as a structure. The top reinforcing bar 101 can be used for structural calculation as a structural member only in the case of a deformed reinforcing bar (see JIS G3551).

An upper end bar (beam main bar) (not shown) is arranged on the top bar 101, and the top bar 101 of a plurality of truss muscles and this upper end bar (beam main bar) are fixed by welding or the like to form a structure. Become. However, if the heights of the top bars 101 of the plurality of truss muscles vary from the mounting surface, the top bars (beam main bars) cannot be stably placed. As a result, some truss muscles will be returned as defective products from the site.

On the other hand, the bottom bars 111 and 112 are mounting members for arranging the truss bars in a flat place. The bottom muscles 111 and 112 are made in parallel and placed on the same plane so that the truss muscles can be stably installed.

The bottom bar is not treated as a structural member of the building.

The lattice muscle 121 is a wavy curved structural member that connects the top muscle 101 and the bottom muscle 111. The lattice muscle 122 is intended to connect the top muscle 101 and the bottom muscle 111. Each lattice muscle has a wavy shape and is welded to the top muscle 101 and each bottom muscle at the apex and the lowest point of the "wave". Hereinafter, the point to be welded is referred to as a "welding point".

Therefore, the lattice muscles 121 and 122 and the top muscle 101 are connected at a plurality of locations (10 locations each in FIG. 1) by welding. Similarly, the lattice muscles 121 and the bottom muscles 111, and the lattice muscles 122 and the bottom muscles 112 are also fixed at a plurality of locations (11 locations in FIG. 1).

Lattice muscles are also rarely treated as structural members of buildings.

FIG. 2 is a side view of an ideal truss muscle.
When the ideal truss muscle is viewed from the side, the top muscle 101 and the bottom muscles 111 and 112 are parallel to each other. In addition, the bottom muscles 111 and 112 are also parallel and appear to overlap when viewed from the side.

Since the lattice muscles 121 and 122 also overlap, the lattice muscle 122 overlaps the lattice muscle 121. In this method, when the precast material including the lattice muscles is suspended by a crane or the like, the top reinforcement 101 and the lattice reinforcements 121 and 122 are slung and suspended at the welding points. Therefore, the welding points of the top bar 101 and the lattice bar 121 and the welding points of the top bar 101 and the lattice bar 122 appear to overlap when viewed from the side surface. In addition, the lattice muscle 121 and the lattice muscle 122 also appear to overlap.

(problem)
At the time of welding, high temperatures are applied to the top bars 101, bottom bars 111 and 112, and lattice bars 121 and 122. Therefore, there is a great possibility that each member of the truss muscle will be deformed due to heat during manufacturing.

The possible harmful effects of this heat deformation are
1) Longitudinal bending 2) Longitudinal bending 3) Truss muscle placement failure due to difference in bottom muscle bending amount 4) Truss muscle placement failure due to difference in bottom muscle bending angle, etc. are mainly considered. .. Depending on the conditions, the top bar 101 is also a target of structural calculation of the building, so that the mass is large and the influence of heat during welding is small as a result. Therefore, the top muscle 101 is not easily affected by heat (although not completely).

Hereinafter, how each case can be improved by the present invention will be described.

(First Embodiment)
FIG. 3 is a side view showing the truss muscle 200 that has caused the problem assumed in the first and second embodiments. In the following figures, the distortion (warp) is emphasized more than the actual object. This is because if it is expressed as an actual size ratio, it cannot be identified when it is expressed as a figure.

The truss muscle 200 includes top muscles 201, bottom muscles 211 and 212, and lattice muscles 221 and 222.

In FIG. 3, it is assumed that an error occurs at the central welding point A of the bottom bar 212 of the truss bar 200 and the lattice bar 222 bends at the welding point A.

In the embodiment of this figure, it can be supported at three points by the welding point A and the bottom bar 211. Therefore, the truss muscle 200 can be stably placed. However, since it is the basis for the following explanation, it is explained here that it needs to be corrected.

In this case, it is considered that the lattice muscle 222 at the welding point A is stretched due to the influence of heat. As a result, the bottom muscle 212 bends due to the influence of the elongation of the lattice muscle 222.

In the embodiment of this figure, since the lattice muscle 222 is stretched by heat at the point A, a force is applied to both the longitudinal direction and the perpendicular direction. Here, the longitudinal direction refers to the longitudinal direction of the top muscle 201 and the unextended bottom muscle 211. In FIG. 3, the longitudinal direction is the left-right direction.

The vertical direction is the direction of the perpendicular of the plane when the truss muscles that are not stretched by heat are placed on a certain plane. In FIG. 3, the perpendicular direction is the vertical direction in the figure.

It goes without saying that the stress due to the lattice muscle 222 applied to the bottom muscle 212 at the point A disappears when the joint between the lattice muscle 222 and the bottom muscle 212 at the point A is released.

FIG. 4 is a side view of the truss muscle 200 obtained by cutting the point A. By freeing the bottom muscle 212 and the top muscle 222, the force exerted by the lattice muscle 222 on the bottom muscle 212 is also eliminated, and the pressure applied to the bottom muscle 222 is also eliminated. As a result, the linearity of the bottom muscle 212 is restored, and the truss muscle 200 can be kept stable.

It is also conceivable that the welding operator may perform welding at an angle between the lattice muscle and the bottom muscle at the time of welding at point A. Even in such a case, it is possible to solve the problem by the method according to the present embodiment in which the point A itself disappears.

(Second Embodiment)
As an example of this modification, the example of FIG. 5 can be considered.
FIG. 5 is a side view showing a method of eliminating the elongation of the lattice muscle 222 according to the second embodiment of the present invention.

In the first embodiment, by cutting the point A, the stress due to the deformation of the lattice muscle 222 is prevented from being transmitted to the bottom muscle 212.

However, if the stress due to the elongation of the lattice muscle 222 is not transmitted, it is not necessary to cut the point A itself.

Therefore, if the two points B and C, which are the inclined portions of the lattice muscle 222, are cut, the stress due to the elongation of the lattice muscle 222 is not transmitted to the point A. As a result, the linearity of the bottom muscle 212 is restored as in the first embodiment.

However, unlike the first embodiment, the stress received from the lattice muscle 222 may exceed the elastic limit and cause plastic deformation. In this case, it should be noted that it is necessary to cut not only at points B and C but also at point A.

(Third Embodiment)
Next, a third embodiment of the present invention will be described.
FIG. 6 is a side view showing the truss muscle 300 that has caused the problem assumed in the third embodiment of the present invention.
In the first and second embodiments, deformation of the lattice muscle 222 is assumed, and a method for eliminating the deformation has been described. On the other hand, in the third embodiment, the deformation (elongation) of the bottom muscle 212 itself is assumed.

The truss muscle 300 of the third embodiment is also composed of a top muscle 301, a bottom muscle 311 and 312, and a lattice muscle 321 and 322. Since these components are the same as those of the first embodiment, the description thereof will be omitted.

In the present embodiment, it is assumed that the bottom muscle 312 is stretched by heat, and the lattice muscle 312 is deformed by it. In FIG. 6, it is assumed that the bottom muscle 312 is stretched by heat almost evenly at all points in the longitudinal direction.

FIG. 7 is a side view showing a method of eliminating the elongation of the bottom muscle 312 according to the third embodiment of the present invention.

In the third embodiment, the bottom muscle 312 is cut at an arbitrary location, and if possible, at the location where the amount of change is the largest. At this time, unlike the first and second embodiments, the cutting is performed while avoiding the welding point. This is because the lattice muscle 322 is deformed by the stress of the bottom muscle 312. In FIG. 7, it is cut at point D.

By cutting the bottom muscles 312 in the middle to make the bottom muscles 312a and 312b in this way, the stress applied to the bottom muscles 312a and 312b is dispersed. As a result, the stress applied to the lattice muscle 322 is dispersed, and the bottom muscles 312a and 312b are located on the same plane.

If the lattice muscles 322 undergo plastic deformation even when the bottom muscles 312 are cut and the bottom muscles 312a and 312b are not located on the same plane, it is the first time that the bottom muscles 312 and 312b should be treated as defective products for the first time. The same applies to the second embodiment.

When the distortion of the bottom muscle 312 is severe, it is conceivable to cut the bottom muscle 312 not only at one place but at two or more places.

Although the invention made by the present inventor has been specifically described above based on the embodiment, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist thereof. Needless to say, there is.

In the above three examples, only one bottom muscle of the truss muscle was deformed, and the other bottom muscle maintained linearity. Therefore, since the truss muscle can be stably placed on a certain flat surface, it is rarely returned as a defect at the actual site.

However, in reality, both of the two bottom muscles included in one truss muscle are often curved. In this case, the truss muscle cannot be placed stably, so it becomes unstable during the work, and as a result, it is returned as a defective product.

In the above case, it goes without saying that the two bottom muscles may be treated differently in the above three embodiments or the same measures may be taken depending on the symptoms of the truss muscles.

In addition, even if one bottom muscle is bent or broken, it is highly possible that both the bottom muscle and the lattice muscle are deformed. In this case, it goes without saying that countermeasures may be devised using a plurality of means.

FIG. 8 is a side view showing a method of eliminating the elongation of the bottom muscle 312 and the lattice muscle 322 according to another embodiment of the present invention. In this figure, not only the bottom muscle 312 is cut at the point E as a means for eliminating the elongation of the bottom muscle 312, but also the lattice muscle 322 is cut at the point F as a means for eliminating the elongation of the lattice muscle 322.

Further, even if the bending of the two bottom muscles is the same cause, the amount of each bending may be different, or the most bent part in the longitudinal direction may be different. In this case, it is also included in the range of the present invention to deal with both by appropriate means.

FIG. 9 is a side view showing a method of eliminating the bottom muscle 312 elongation according to another embodiment of the present invention.

In FIG. 9, both the bottom muscles 311 and 312 are extended and bent in an arc. However, the amount of curvature of the bottom muscle 311 is small, while the amount of curvature of the bottom muscle 312 is large. Therefore, the bottom muscle 312 is cut at two points, the G point and the H point. On the other hand, since the bottom muscle 311 has a small amount of elongation, the bottom muscle 311 is cut at one point I. The range of the present invention also includes providing two or more cutting points according to the amount of change and changing the number of cutting points of the bottom muscle and the lattice muscle.

Furthermore, even if both of the two bottom muscles included in the truss muscle are curved, it is not necessary to eliminate the curvature of both muscles. As described in FIG. 3, even if one bottom muscle remains curved, the bottom muscle can be stably placed as long as the other bottom muscle maintains linearity. Therefore, the operator does not need to remove both curves of the two bottom muscles of the truss muscle, provided that the upper end muscle can be placed stably.

Further, in the above, only the case where the bottom muscle is bent downward in the perpendicular direction is assumed. However, it goes without saying that it can also be applied to the so-called "pulling" that occurs when the bottom muscles "shrink".

Here, "mukuri" is written as "origin". A curve that curves upward in the vertical direction of each figure. In the present invention, it means that the bottom muscle is curved upward in the perpendicular direction of each figure.

FIG. 10 is a side view showing a method of relieving the shrinkage of the bottom muscle 412 according to another embodiment of the present invention.

The truss muscle 400 in this figure includes a top muscle 401, a bottom muscle 411, 412, and a lattice muscle 421 and 422.

In this figure, the bottom muscle 412 is "rolled". "Mukuri" occurs when the bottom muscle 412 and the lattice muscle 422 contract, or when the attachment angle between the bottom muscle 412 and the lattice muscle 422 is abnormal, as in the case of stretching.

Therefore, when the bottom muscle contracts, the contracted portion is cut so that the bottom muscle 412 touches the ground. In this figure, the bottom muscle 412 is aimed to touch the ground by cutting at the J point.

In this way, the present invention can be applied not only to elongation but also to contraction.

The present invention proposes a method for correcting truss muscles in a building, particularly a method for correcting slight distortion of truss muscles at a construction site.

100, 200, 300, 400: truss muscle,
101, 201, 301, 401: Top muscle,
111, 112, 211, 212, 311, 312, 411, 412: Bottom muscle,
312a, 312b: Bottom muscle,
121, 122, 221, 222, 321, 322, 421, 422: Lattice muscle,
A, B, C, D, E, F, G, H, I, J: Cut point.

Claims (10)

Lattice muscles that bend on the waves and
A method for correcting the curvature of the bottom muscle of a truss muscle, which includes the lattice muscle and a bottom muscle welded at two or more points, and is placed on a concrete floor so that the bottom muscle faces.
A method for correcting curvature of a bottom muscle, which comprises cutting one welding point between the bottom muscle and the lattice muscle. The bottom muscle curvature correction method according to claim 1, wherein the bottom muscle curvature correction method is intended to eliminate the elongation of the lattice muscle. The bottom muscle curvature correction method according to claim 1, wherein the bottom muscle curvature correction method is intended to correct the attachment angle of the welding point of 1. Lattice muscles that bend on the waves and
It is a method for correcting the curvature of the bottom muscle of a truss muscle, which includes the lattice muscle and the bottom muscle welded at a certain welding point, and is placed on the concrete floor so that the bottom muscle faces.
A method for correcting bottom muscle curvature, which comprises cutting the bottom muscle at one place other than the welding point. Lattice muscles that bend on the waves and
It is a method for correcting the curvature of the bottom muscle of a truss muscle, which includes the lattice muscle and the bottom muscle welded at a certain welding point, and is placed on the concrete floor so that the bottom muscle faces.
The bottom muscle is cut at one place other than the welding point, and the bottom muscle is cut.
A method for correcting bottom muscle curvature, which comprises cutting the lattice muscle at one place other than the welding point. Lattice muscles that bend on the waves and
It is a method for correcting the curvature of the bottom muscle of a truss muscle, which includes the lattice muscle and the bottom muscle welded at a certain welding point, and is placed on the concrete floor so that the bottom muscle faces.
A method for correcting bottom muscle curvature, which comprises cutting the bottom muscle at two or more places other than the welding point. The bottom muscle curvature correction method according to any one of claims 4 to 6, wherein the bottom muscle curvature correction method is intended to eliminate the elongation of the bottom muscle. The first lattice muscle that curves on the waves,
With the first lattice muscle and the first bottom muscle welded and twisted at one or more points,
Including the second bottom muscle,
This is a method for correcting improper placement of truss muscles, which are placed so that the first bottom bar and the second bottom bar face each other on a concrete floor.
A method for correcting improper placement, which comprises cutting one welding point between the first bottom muscle and the first lattice muscle. The first lattice muscle that curves on the waves,
With the first lattice muscle and the first bottom muscle welded and twisted at one or more points,
Including the second bottom muscle,
This is a method for correcting improper placement of truss muscles, which are placed so that the first bottom bar and the second bottom bar face each other on a concrete floor.
A method for correcting improper placement, which comprises cutting a portion other than a welding point between the first bottom muscle and the first lattice muscle. The first lattice muscle that curves on the waves,
A first bottom bar that is welded and twisted at one or more weld points with the first lattice bar,
Including the second bottom muscle,
This is a method for correcting improper placement of truss muscles, which are placed so that the first bottom bar and the second bottom bar face each other on a concrete floor.
A method for correcting improper placement, which comprises cutting the lattice muscle at one place other than the welding point.

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