JP7208698B2 - Method for measuring the strength of weld points between top and lattice muscles and jig for measuring the strength of weld points between top and lattice muscles - Google Patents

Description

The present invention provides a jig capable of appropriately measuring the welding strength and the welding strength at the junction between the bottom reinforcement and the lattice reinforcement included in the truss reinforcement.

It is often pointed out that Japan's construction industry lags far behind other industries in improving productivity. For example, based on the Cabinet Office's "National Accounts", the Ministry of Internal Affairs and Communications' "Labor Force Survey", and the Ministry of Health, Labor and Welfare's "Monthly Labor Survey," productivity in 2013 was 4,317 yen/person-hour for all industries and 5,412 yen/person for the manufacturing industry.・While it is time, the construction industry is only 2638 yen/person hour.

In the construction industry, the work that requires manual labor in concrete work includes 1) assembly of reinforcing bars, 2) assembly of formwork, and 3) compaction of concrete. It goes without saying that improving productivity in these areas is directly linked to improving productivity in the construction industry.

The construction industry also shows the highest rate of casualties among all industries. In FY 2014, the "1,000 worker rate ((number of casualties per year/average number of workers per year) x 1000)" for all industries slightly exceeded 2, while it reached 5 for the construction industry.

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

Therefore, it is necessary to actively use the precast method to deal with these problems.

The precast construction method means the following. It should be noted that all processes are performed at the factory here.

First, one or more truss bars are placed on an appropriate thin steel plate or concrete plate. Then, after placement, a steel wire that can be a structural material is placed on the top reinforcement included in the truss reinforcement, and it is joined to the top reinforcement by welding or the like. Then, a wooden frame is made around the iron plate, ready-mixed concrete is poured into it, and hardened. When the concrete hardens and the wooden frame is removed, it becomes the precast board as a product. By bringing this to the site as it is, quick construction becomes possible.

If you want to calculate the strength of the truss bar as a structural member, you should look at the properties of the top bar. If the top bar is a metal round bar, it is not subject to structural calculation, and if the top bar is a deformed iron wire, the strength calculation can be performed according to the requirement.

However, there are other considerations for strength other than structural design. The biggest issue in truss muscles is "transportation". Since precast plates are manufactured in factories, transportation to the site is essential. The precast plate is in a state where the concrete has been partially poured, so it is quite heavy.

FIG. 1 is a perspective view of a typical truss bar 800. FIG. 2 is a side view of the truss bar 800. FIG.

The truss 800 includes top muscles 801 , bottom muscles 811 and 812 , and lattice muscles 821 and 822 .

The top bar 801 is a reinforcing bar that forms a structure such as a building. The top bar 801 can be used for structural calculation as a structural member only in the case of a deformed bar (see JIS G3551).

On the other hand, the bottom reinforcements 811 and 812 are mounting members for arranging the truss reinforcements on a flat plate. The bottom reinforcements 811 and 812 are made parallel and placed on the same plane, so that the truss reinforcements can be stably installed.
Note that the bottom bar is not treated as a structural member of the building.

The lattice muscle 821 is a wavy curved structural member connecting the top muscle 801 and the bottom muscle 811 . The lattice muscle 822 is intended to connect the top muscle 801 and the bottom muscle 811 . Each lattice muscle has a wavy shape and is welded to the top and bottom muscles 801 at the top and bottom of the "wave". The points to be welded are hereinafter referred to as "welding points".

Therefore, the lattice bars 821 and 822 and the top bar 801 are connected by welding at a plurality of points (10 points each in FIG. 1). Similarly, the lattice muscle 821 and the bottom muscle 811, and the lattice muscle 822 and the bottom muscle 812 are also fixed at a plurality of positions (11 positions in FIG. 1).

Lattices are also rarely treated as structural members of buildings.

When transporting the precast plate, the welding points of the top reinforcement 101 and the lattice reinforcement 121 are slinged. Then, it is placed on a trailer or the like (not shown) by hanging it from above, and brought to the construction site.

Since it is suspended from the top in this way, it is extremely important to accurately grasp the vertical force that can be applied to the weld point.

Conventionally, the strength of this weld point has been measured by the following means.

FIG. 3 is a diagram showing a conventional method for measuring the weld point strength between the top muscle and the lattice muscle.

In FIG. 3, the object to be measured includes a truss bar 901 , a jig body 702 , a retainer 703 , an upper end gripper 704 , a bolt 705 and a metal piece 706 .

A truss muscle 901, which is an object to be measured, is a top muscle 901a and a lattice muscle 902b cut out from a truss muscle 800, which is an object to be measured. In this document, the truss bar as a product is numbered 800, and the truss bar cut out from the truss bar 800 as a measurement target is numbered 901.

The top muscle 901a is cut to a length of about 200 mm centering on the welding point to be measured.

The top muscle 901 a is hooked on the jig body 902 . Therefore, the top muscle 901a needs to have a certain length or longer.

The lattice muscle 901b is cut including the welding point to be measured.
The lattice muscle 901b before cutting extends from both of the welding points to the bottom muscle (not shown). At the time of cutting, one stretched lattice muscle is grabbed and pulled by a hydraulic universal testing machine (not shown). The other lattice muscle has no particular use and may be cut near the welding point.

In FIG. 3, a metal strip 906 for pulling is drawn on the pulling side of the lattice muscle 901b, but there is no problem if this is not provided.

In addition, as is clear from Figures 1 and 2, two lattice muscles are fixed to one point of the truss bar with the truss bar in between, but the measurement target is one of the welding points. become.

A jig main body 702 is a jig for applying force to a welding point by a hydraulic universal testing machine (not shown). The jig 702 is approximately fan-shaped.

The jig 702 is designed so that the top muscle 901a, which is the object to be measured, can be hooked on the side of the fan-shaped shaft. In addition, an arc-shaped hole 702b centered on the axis is opened in the fan surface portion, and an upper end gripper 704 is attached so as to move freely.

The retainer 703 is used by being fixed to the jig body 702 with several bolts 705 . Conversely, when the bolt 705 is loosened, the retainer 703 can be removed from the jig body 702 . After removing the retainer 703 and the jig body 702 , the top muscle 901 a is set on the jig body 702 . Then, when the retainer 703 is fixed again with the bolt 705, the preparation for measurement is completed.

The upper end gripper 704 is a member for hooking on the upper end of a hydraulic universal testing machine (not shown) to pull the weld point to be measured.

A bolt 905 is a bolt for fixing the jig body 702 and the retainer 703 .

In FIG. 3, the upper end gripper 704 is pulled upward and the metal piece 706 is pulled downward in the direction of the arrow. The force applied when the weld fractures becomes the weld strength of the weld.

Kaiser truss (for TRC floor slab) P6 Photo-2 Nippon Kaiser Co., Ltd. Publication year unknown

However, with the above method, it is unavoidable that a rotational moment is generated at the welding point. When a rotational moment is generated, the tensile force at the time of weld fracture is not necessarily the strength of the weld, resulting in a lack of accuracy.

SUMMARY OF THE INVENTION An object of the present invention is to provide a jig capable of measuring the strength of a weld without generating a rotational moment.

The above and other objects and novel features of the present invention will become apparent from the description of the specification and the accompanying drawings.

A typical method for measuring the strength of weld points between the top muscles and the lattice muscles of the truss muscles according to the present invention is characterized in that the strength is measured without generating a moment at the weld points between the top muscles and the lattice muscles.

Another representative method for measuring the strength of the weld point between the top muscle and the lattice muscle of the truss muscle related to the present invention is
It is characterized by including a lattice muscle fixation step of fixing both of the lattice muscles sandwiching the weld point between the top muscle and the lattice muscle, and a measurement step of measuring the strength of the weld point.

This method of measuring the strength of the weld point between the top bar and the lattice bar may be characterized by measuring the strength of the weld point without cutting the bottom bar of the truss bar.

Another typical method for measuring the strength of the weld point between the top muscle and the lattice muscle of the truss muscle according to the present invention includes a bottom muscle fixing step of fixing the bottom muscle of the truss muscle and a measurement step of measuring the strength of the weld point. and

A representative jig for measuring the strength of the top muscle-lattice weld point of the truss muscle related to the present invention is used for strength measurement of the top muscle-lattice weld point. characterized by comprising

This jig for measuring the strength of the weld point between the top muscle and the lattice muscle may be characterized in that the holding part fixes both lattice muscles sandwiching the weld point between the top muscle and the lattice muscle.

Another typical jig for measuring the strength of the weld point between the top muscle and the lattice muscle of the truss muscle according to the present invention is a jig for measuring the strength of the weld point between the top muscle and the lattice muscle. It is characterized by including a part.

Another typical truss muscle related to the present invention is a jig for measuring the strength of the weld point between the top muscle and the lattice muscle, which is used for measuring the strength of the weld point between the top muscle and the lattice muscle. It is characterized by being cut around the welding point and set in a jig for strength measurement of the welding point between the top muscle and the lattice muscle.

The jig for measuring the strength of the weld point between the top muscle and the lattice muscle used to measure the strength of the weld point between the top muscle and the lattice muscle of these truss muscles has a holding part that is approximately 90° in the front-rear direction of the top muscle when viewed from above. It may be characterized by swinging in directions that do not intersect each other.

Another typical truss muscle related to the present invention is a jig for measuring the strength of the weld point between the top muscle and the lattice muscle, which is used for measuring the strength of the weld point between the top muscle and the lattice muscle. It is characterized in that the strength measuring jig is separated into an upper jig and a lower jig.

This jig for measuring the strength of the welding point between the top bar and the lattice bar may be characterized in that the strength can be measured by setting the truss bar to be measured on the upper jig and the lower jig.

The upper jig of the jig for measuring the strength of the welding point between the top muscle and the lattice muscle may be characterized by including a cover and a U-shaped groove jig.

This jig for measuring the strength of the welding point between the top bar and the lattice bar may be characterized in that the top bar of the truss bar to be measured is set in a groove provided in the U-shaped groove jig.

This jig for measuring the strength of the welding point between the top bar and the lattice bar may be characterized in that the lattice bar of the truss bar does not interfere with the U-shaped groove jig when the top bar is set in the groove.

The upper jig of the jig for measuring the strength of the welding point between the top muscle and the lattice muscle may be characterized by including a cover, a guide rail, and a holding portion.

It may be characterized in that the restraining portion of the jig for strength measurement of the welding point between the top muscle and the lattice muscle swings along the guide rail.

These jigs for measuring the strength of weld points between top muscles and lattice muscles may be characterized by measuring the strength of the weld points by pulling the upper jig and the lower jig.

By using the jig according to the present invention, it becomes possible to measure the strength of accurate welding points of truss bars.

It is a perspective view of a common truss bar. It is a side view of a common truss bar. FIG. 10 is a diagram showing a conventional method for measuring the strength of a weld point between a top muscle and a lattice muscle. It is a perspective view showing the upper jig|tool and lower jig|tool in connection with this invention. It is a perspective transparent view showing the upper jig|tool and lower jig|tool in connection with this invention. FIG. 4 is a side view showing the configuration of the upper jig and the lower jig in use according to the present invention; FIG. 7 is a conceptual cross-sectional view of the main parts of the upper jig and the lower jig in the A-A′ cross section of FIG. 6 viewed from the front-rear direction of the top muscle; FIG. 4 is a cross-sectional view of the vicinity of the through hole of the U-shaped groove jig; FIG. 2 is a conceptual diagram showing a cut state during measurement of a truss muscle to be measured. FIG. 10 is a conceptual diagram showing another cutting situation during measurement of the truss muscle to be measured.

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment)
FIG. 4 is a perspective view showing an upper jig 100 and a lower jig 200 according to the present invention. FIG. 5 is a perspective perspective view showing an upper jig 100 and a lower jig 200 according to the present invention. FIG. 6 is a side view showing the configuration of the upper and lower jigs in use according to the present invention. FIG. 7 is a conceptual cross-sectional view of the main parts of the upper jig and the lower jig in the AA' cross section of FIG. 6 viewed from the front-rear direction of the top muscle. FIG. 8 is a cross-sectional view of the U-shaped groove jig 120 near the through hole 122. As shown in FIG.

Note that FIG. 4 includes large arrows indicating from which direction FIGS. 7 and 8 are viewed. In addition, FIG. 6 is illustrated in a partially transparent state. The shape of the truss bar 901, which is the object to be measured, during measurement will be described later with reference to FIGS. 9 and 10. FIG. 4 to 7 assume that the truss bars 901 of FIG. 10 are set.

The welding point strength measuring jig according to the present invention is roughly divided into an upper jig 100 and a lower jig 200 which are physically separated. Furthermore, the upper jig 100 and the lower jig 200 are composed of fine parts. Then, by setting the members obtained by cutting out a part of the truss bar 901 shown in FIG. 9, the structure shown in FIG. 4 is obtained. The present invention is characterized in that the strength of the welding point between the top reinforcement 901a of the truss reinforcement 901 and the lattice reinforcement 901c is measured by pulling it from above and below.

An upper jig 100 according to the present invention includes a cover 110, a U-shaped groove jig 120, and a fixing member .

The cover 110 is a housing corresponding to the structure of the upper jig 110 . A hole 111 into which a fixing member 130 is inserted is drilled to fix the U-shaped groove jig 120 . By inserting the fixing member 130 into the hole 111, the U-shaped groove jig 120 will not come off the cover 110 even if the upper jig 100 and the lower jig 200 are pulled from above and below.

The cover 110 is also provided with a locking end 112 for connection to the upper end of the hydraulic universal testing machine.

The U-shaped groove jig 120 is a jig having a U-shaped groove for fixing the top reinforcement 901a of the truss reinforcement.

In simple terms, the U-shaped groove jig 120 can be compared to an upside down "desk with four legs on a 'rectangular top plate'". A groove 121 is dug in the long side direction of the "rectangular top plate", that is, the leg side of the bottom plate 124 . The measurer sets the top muscle of the truss muscle to be measured in this groove 121 .

The short side of the "rectangular top plate" is made as short as possible, and the corners of the banks of the grooves 121 are slanted so that the lattice muscles do not interfere when setting the truss muscles (the grooves 121 and the lattice muscles in FIG. 7). 901b does not interfere). In addition, the side surface is opened to set the bottom lattice muscle of the truss muscle to be measured. For this reason, the bottom plate 124 has a "four-legged" shape.

For these reasons, the U-shaped groove jig 120 must be prepared for each truss bar to be measured.

The U-shaped groove jig 120 is provided with through holes 122 so as to pass through the "legs" facing each other in the short side direction. By inserting the fixing member 130 into the through hole 122 and the hole 111 of the cover 110, the cover 110 and the U-shaped groove jig 120 are fixed. In order to provide this through hole 122, the U-shaped groove jig 120 has "four legs". This “foot” is called a fixed leg 123 .

However, it goes without saying that there is no problem even if four or more fixing legs 123 are prepared as long as they do not come into contact with the truss bar 901 to be measured.

In each drawing, the fixing member 130 is represented as a simple rod. However, it is naturally within the scope of the present invention to add a locking pin or the like to prevent falling off during operation.

The lower jig 200 includes a cover 210 , a guide rail 230 and a holding portion 240 . There is also a spacer 310 as an accessory.

The cover 210 is a housing corresponding to the structure of the lower jig 200 . The cover 210 grips all members of the lower jig 200 via the guide rails 230 . A locking end 212 is also provided for connection to the lower end of a hydraulic universal testing machine.

The guide rail 230 is a guide for moving the holding portion 240 so as to fit the holding portion 240 to the lattice muscle to be measured. If the holding portion 240 is to be replaceable, the guide rail 230 should be detachable, but that is merely a matter of design.

By following the guide rail 230 , the holding portion 240 can slide (oscillate) in a direction that does not intersect the guide rail 230 at approximately 90 degrees when viewed from above with respect to the top muscle 901 a.

The restraining portion 240 is a fixing member for fixing the lattice muscle 901c of the truss muscle to be measured and, in some cases, the bottom muscle 901b. The restraining portion includes a base portion 241 , a fixing portion 242 , a shaft 243 , a restraining plate 244 , and several bolts for fixing the fixing portion 242 and the restraining plate 244 .

Two holding parts 240 are required to measure one truss muscle. This is because, unlike the conventional measuring jig, the measurement is performed while the two lattice muscles are present. Therefore, each restraining portion 240 needs to have sufficient strength so as not to be distorted even if force is applied from a balancing machine (not shown). In particular, it can be said that the base 241 is required to have such strength.

The base portion 241 is a member for holding the restraining portion 240 on the guide rail 230 so as to be able to swing. A guide hole 241a is formed in the base portion 241, and the guide rail 230 is inserted therein. As described above, since the restraining portion 240 is required to have high strength, the guide hole 241a and the guide rail 230 are required to be fitted with extremely high accuracy.

In each drawing attached to this specification, two bases 241 are assigned to one fixing part 242 . If three or more base portions 241 must be present in one fixing portion 242 for measurement, the number of base portions 241 may be increased.

A shaft hole 241b is bored in the base portion 241 in a direction orthogonal to the guide rail 230 and the guide hole 241a. This is the hole necessary for the shaft 243 to pass through. Needless to say, the fitting accuracy between the shaft hole 241b and the shaft 243 is also required to be high. It goes without saying that both the shaft hole 241b and the shaft 243 have sufficient strength.

The fixing part 242, the shaft 243, the holding plate 244, and several bolts that fix the holding plate 244 and the fixing plate 242b, which is part of the fixing part 242, hold down the lattice bar 901b (or the bottom bar 902c in some cases) of the truss bar 901. It is a member included in the holding portion 240 for the purpose.

The fixed part 242 is physically connected to the two base parts 241 via the shaft 243 . Therefore, the fixed portion 242 is provided with two shaft holes 242a for fitting the shafts 243 on the left and right. These two shaft holes 242a need to be concentric in order for the fixing portion 242 to rotate smoothly. Needless to say, these shaft hole 242a and shaft 243 are required to have high fitting accuracy and sufficient strength.

The shaft hole 242a is drilled so as to be substantially parallel to the top muscle 901a when the fixing portion 242 is set on the base portion 241 .

A fixed plate 242b in the form of a flat plate is provided at one end in the circumferential direction of the shaft hole 242a. The fixing plate 242b is a plate-like portion of the fixing portion 242 for fixing the lattice muscle 901c of the truss bar 901 to be measured by using it together with the holding plate 244. FIG. The fixing plate 242b in this embodiment has bolt holes, and the fixing plate 242b, the holding plate 244, and the bolt hold down the lattice 901c of the truss bar 901 and the bottom bar 902b.

Accuracy is not required between the fixing plate 242b and the restraining plate 244, but it is needless to say that they must have the strength to hold the truss bars firmly. This is because high-precision measurement cannot be expected if the truss muscles begin to move when a force is applied. Although two bolts are used in the drawing, it goes without saying that three or more bolts may be used.

The holding plate 244 is a member for fixing the truss bar 901 to be measured to the fixing plate 242b. The holding plate 244 is also formed with bolt holes for fixing to the fixing plate 242b. This is for fixing the restraining plate 244 to the fixed plate 242b with bolts. However, the fixing method is not limited to this. As long as the fixing strength can be secured, there is no problem even if it is fixed with a clip or the like.

As shown in FIG. 6, it should also be considered to make the inner side of the cross section of the holding plate 244 (the side in contact with the fixing plate 242b) zigzag to increase the number of points of contact and make it easier to stabilize the truss bar 901 (this is not always the case). Although it is not a thing to do).

By doing so, it becomes possible to fix both of the lattice muscles 901c sandwiching the welding point to be measured. As a result, it is possible to prevent a moment from being generated at the measurement point, and it is possible to measure the strength with high accuracy.

In addition, by leaving both the bottom reinforcements 901b included in the truss reinforcements and fixing them with the restraining part 240, it is possible to prevent the moment from being generated even in the direction perpendicular to the top reinforcements, resulting in a highly accurate strength. It should also be considered to be able to take measurements.

An operator who measures the strength of the weld point adjusts the position of the base portion 241 of the lower jig 200 and the angle of the fixing portion 242 so that the truss bars are fixed stably and firmly.

The spacer 310 is a protective material for preventing sudden deformation when the upper jig 100 and the lower jig 200 are pulled by a balancing machine (not shown).

FIG. 9 is a conceptual diagram showing how a truss bar 901 to be measured is cut during measurement. Originally, each welding point is joined, but in this drawing, priority is given to visibility, and each member is intentionally separated. Also, since there is no particular difference in the truss bars, which are objects to be measured, between the conventional example and the embodiment of the present invention, FIGS. 9 and 10, the same reference numbers are used.

Needless to say, the truss bar 901 includes one top bar 901a, two bottom bars 901b, and two lattice bars 901c, like the truss bar 800 as a product.

The top muscle 901a is cut to a length that allows it to be placed in the groove 121 centering on the welding point A to be measured. At this time, it is important that approximately the same length remains before and after the welding point A. At the time of measurement, a force is applied to the top muscle 901a from a hydraulic universal testing machine (not shown).

Each lattice muscle 901c is cut so as to leave a welding point A and a welding point B between a bottom muscle 901b and a lattice muscle 901c adjacent to each other. Also, the bottom reinforcement 901b is cut so as to leave the welding point B so as not to interfere with the work.

Here, the adjacency of ``welding point B between bottom reinforcement 901b and lattice reinforcement 901c, which are "adjacent" to welding point A'' means that they are adjacent via the same lattice reinforcement 901c. FIG. 9 shows that the bottom bar 901b connecting the "welding point B between the bottom bar 901b and the lattice bar 901c adjacent to the welding point A" is also left.

The reason why the bottom reinforcement 901b is left unlike the conventional example is to prevent deformation of the lattice reinforcement 901c by leaving the bottom reinforcement 901b.

In addition to fixing the lattice muscle 901c with the fixing portion 242, the pressing plate 244, and several bolts for fixing them, the bolts may be hooked on the bottom muscle 901b. After all, if no moment is generated at the welding point A to be measured, no specific fixing method is required.

After setting the truss bars to the jig, the locking ends 112 and 212 are set in a hydraulic universal testing machine in the same manner as before. Then, force is applied to the hydraulic universal testing machine until the weld point between the top muscle 901a and the lattice muscle 901c breaks. Then, the number obtained by dividing the force applied by the hydraulic universal testing machine by 2 becomes the stress limit of the weld point. The reason for dividing by "2" is that the top muscle 901a of the truss muscle to be measured has a lattice muscle 901c and two welding points for fixing the lattice muscle 901c to the top muscle 901a.

It should be noted that another method is also conceivable for the method of cutting the truss bar, which is the object to be measured. FIG. 10 is a conceptual diagram showing another cutting situation during measurement of the truss bar 901 to be measured.

This figure does not include the bottom muscle 901b at the time of measurement by cutting the lattice muscle 901c in the middle. If the lattice muscle 901c is firmly fixed, it is possible to measure the weld point strength between the top muscle 901a and the lattice muscle 901c without fear of deformation even if the bottom muscle 901b does not exist. Therefore, measurement using the cutting method shown in FIG. 10 should also be considered.

As described above, in the conventional strength measurement of weld points, force is applied from one side of the lattice muscle connected to one weld point. On the other hand, in the method of measuring the strength of a welded point according to the present invention, the strength can be measured without generating a rotational moment by applying force from both of the lattice muscles connected to one welded point. As a result, it becomes possible to measure the strength of the welding point with higher accuracy.

The invention made by the present inventor has been specifically described above based on the embodiments, but the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention. One thing goes without saying.

For example, the truss bar has a shape called a double top truss. The double top truss is intended to make the top reinforcement, which is the structural material of the building, thicker and stronger by welding two top reinforcements together.

Naturally, the U-shaped groove jig 120 for the truss bar with one top bar cannot be used when examining the strength of the weld points between the top bar and the lattice bar of this double top truss. Therefore, it is needless to say that the scope of the present invention also includes making a U-shaped groove jig 120 for this double top truss and using it for measuring the strength of the weld point.

Similarly, it is not preferable to use the same U-shaped groove jig 120 for the thick truss reinforcement and the thin truss reinforcement. In this case as well, it is within the scope of the present invention to selectively use the U-shaped groove jig 120 for each.

The present invention provides a method for accurately measuring the strength of welds between top and lattice muscles of truss muscles. However, it is not limited to this, and there is no particular problem if it is diverted to measure the strength of the weld point between the bottom muscle of the truss muscle and the lattice muscle, for example.

100: upper jig,
110: cover,
111: holes,
112: locking end,
120: U-shaped groove jig,
121: Groove,
122: through hole,
123: fixed legs,
124: bottom plate,
130: fixing member,
200: lower jig,
210: cover,
212: locking end;
230: guide rail,
240: holding part,
241: Base,
242: fixed part,
243: axis,
244: holding part,
310: Spacer,
702: jig body,
702b: arcuate hole,
703: Suppress,
704: upper end gripper,
705: bolt,
706: metal piece,
800, 901: truss muscle,
801, 901a: top muscle,
811, 812, 901b: bottom muscle,
821, 822, 901c: Latis muscle.

Claims (6)

A method for measuring the strength of a weld point between the top muscle and the lattice muscle of a truss muscle,
a lattice muscle fixing step of fixing both of the lattice muscles sandwiching the welding point between the top muscle and the lattice muscle;
a measuring step of measuring the strength of the weld point;
A method for measuring the strength of a weld point between a top muscle and a lattice muscle, characterized in that the strength is measured without generating a moment at the weld point between the top muscle and the lattice muscle. In the method for measuring the strength of the weld point between the top muscle and the lattice muscle according to claim 1,
A method for measuring the strength of a weld point between a top bar and a lattice bar, characterized in that the strength of the weld point is measured without cutting the bottom bar of the truss bar. A method for measuring the strength of a weld point between the top muscle and the lattice muscle of a truss muscle ,
a bottom muscle fixing step of fixing both bottom muscles of the truss muscles;
a measuring step of measuring the strength of the weld point;
A method for measuring the strength of a weld point between a top muscle and a lattice muscle, characterized in that the strength is measured without generating a moment at the weld point between the top muscle and the lattice muscle. A jig for measuring the strength of a weld point between a top muscle and a lattice muscle of a truss muscle including two lattice muscles ,
A jig for strength measurement of a welding point between a top muscle and a lattice muscle, characterized by including a restraining portion for fixing both lattice muscles of the truss reinforcement. A jig for measuring the strength of a weld point between a top muscle and a lattice muscle used for measuring the strength of a weld point between a top muscle and a lattice muscle of a truss muscle including two bottom muscles,
A jig for strength measurement of a welding point between a top bar and a lattice bar, comprising a holding part for fixing both bottom bars of the truss bar. In the jig for measuring the strength of the weld point between the top muscle and the lattice muscle used for measuring the strength of the weld point between the top muscle and the lattice muscle of the truss according to claim 4 or 5,
A jig for measuring the strength of a welding point between a top muscle and a lattice muscle, characterized in that the holding part swings in a direction that does not intersect with the front and rear direction of the top muscle by approximately 90 degrees when viewed from above .

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