{"id":4223,"date":"2017-08-17T08:00:31","date_gmt":"2017-08-16T23:00:31","guid":{"rendered":"https:\/\/norimen.net\/wordpress\/?p=4223"},"modified":"2026-05-17T06:55:45","modified_gmt":"2026-05-16T21:55:45","slug":"frame-blockout-role-method","status":"publish","type":"post","link":"https:\/\/norimen.net\/en\/frame-blockout-role-method\/","title":{"rendered":"The Role and Construction Methods of Box Cutouts in Frame Construction | Timing of Cutouts"},"content":{"rendered":"

Hello, everyone.<\/p>\n

This is Enta.<\/p>\n

The Obon holiday is over, huh? lol<\/p>\n

Work is finally starting to pick up today.<\/p>\n

Everyone, it's still very hot out there, so please take extra care while working.<\/p>\n

It looks like the lingering summer heat will be intense this year, too!<\/p>\n

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But that's beside the point.<\/p>\n

Materials Used for Box Cutting by Anchor Installers and Rebar Installers<\/h3>\n

When you're working as an anchor installer or rebar inserter, you often pour concrete at the intersections of formwork, right!?<\/p>\n

What material was used for the box insert at that time?<\/p>\n

I think they're mostly void pipes, or maybe VU PVC pipes, right?<\/p>\n

*\"Box cutting\" refers to the process of pre-drilling holes in order to install anchors or similar fasteners at a later date.<\/strong><\/span><\/p>\n

Materials that must not be used for box-cut construction on slopes<\/h3>\n

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This is it lol<\/p>\n

\"No way! A VP?\" is what I'd say lol<\/p>\n

I fully understand its performance as a box cutter. It\u2019s fine as it is, though...<\/p>\n

The use of VP pipes (vinyl chloride pipes) as formwork material reduces workability during subsequent anchor installation and rebar insertion work.<\/p>\n

The difference between VU and VP pipes is their wall thickness. Roughly speaking, it\u2019s twice as thick. The strength is also about twice as high.<\/p>\n

Why is VP a bad idea?<\/h3>\n

First of all, most box-out plays usually involve a player jumping out, right?<\/p>\n

With VP tubes, if they stick out, they don't break. VU tubes break easily.<\/p>\n

When installing pressure plates and other components, the VP pipe must not come into contact with them and cause them to lift up.<\/p>\n

If the back of the plate is not securely attached, uneven loading may occur, which could cause the formwork to break.<\/p>\n

If the VP pipe is sticking out, it won't break, so you'll need to grind it down with an angle grinder or similar tool.<\/p>\n

This is another real hassle. I just can't seem to get the sander to work right, and it's taking forever to cut through it, lol.<\/p>\n

It's really tough, isn't it?<\/p>\n

*Cross-sectional view showing the box protruding from the frame<\/p>\n

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Countermeasures<\/h3>\n

This is because the slope contractors install it so that it protrudes slightly, but,<\/p>\n

As much as possibleA little lower than the legal limit is just right.<\/strong><\/span>...Please just spare me from having to use it just a tiny bit, lol (it's hard to chip away at with Thunder)<\/p>\n

Some slope contractors are considerate enough to point out that mortar might get into the formwork openings or that the holes might become hard to see.<\/p>\n

But don't worry. As long as it's not hand-drilled, machine drilling is done with tremendous power.<\/p>\n

It can drill through mortar with ease. It\u2019s fine to drill through mortar inside a box cutout.<\/p>\n

It would be better if they installed it lower.<\/p>\n

*Cross-sectional view showing the box protruding from the frame<\/p>\n

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Design Phase<\/h3>\n

Please design the cutouts using VU tubes or void tubes.<\/p>\n

If it sticks out like that, it won't break.<\/p>\n

With VP, it can be really difficult if the angles are even slightly off due to the shape of the die or misalignment during die-cutting.<\/p>\n

There may be cases where concrete cannot be poured as designed.<\/p>\n

(If the angle is clearly off, you'll have to slowly cut the VP pipe with a hand-cut bit, which is a lot of work.)<\/p>\n

As much as possible,Design Using a Void Tube or a VU Tube<\/span><\/strong><\/span>Please do so.<\/p>\n

Void Removal<\/h3>\n

People say it's hard to remove air pockets from a void tube, but if you make something like this, it comes out easily.<\/p>\n

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If you insert it and twist the hollow tube, it comes out easily with a \"thud.\"<\/p>\n

You can buy them in stores for around 10,000 yen, but if you make them yourself, you can do it for just under 2,000 yen.<\/p>\n

If you make it using your company's anchor pins and scrap material, you can build it for practically no cost. (Though you'll need welding rods, gas, and stuff like that, lol.)<\/p>\n

 <\/p>\n

If it appears that a VP is included in the design, please be sure to make a design change!<\/span><\/strong><\/span><\/p>\n

That will make it easier to install.<\/p>\n

 <\/p>\n

See you later.<\/p>\n

Related Articles:Box-cutting angle<\/span><\/strong><\/span><\/a><\/p>\n

The Secrets of Formwork Removal (2017 Edition) | Collaboration Between Slope Contractors and Anchor Contractors<\/a><\/p><\/blockquote>\n