Seven pieces of cardboard bridge

1. Divide all the paper into five strips along the width direction, each strip should be 42mm wide, a total of 35 strips;

2. Set aside one for the bridge deck and one for the pier;

3. Measure the thickness of the remaining 33 strips, if it is greater than 3cm, take out the excess to make the bridge deck, if it is less than 3cm, don't take out the bridge deck again, glue them into a bridge with a height of 42mm and a width of 30mm, and apply more glue between the paper and the paper if it is not enough for 30mm. When sticking, pay attention to the length of the paper strip to stagger each other a little to meet the requirements of the bridge length of 30cm;

4. Glue the bridge deck paper to the bridge, and stick the wide part to both sides;

5. Roll the pier paper into a small roll, roll a few more, flatten it as a pier, because the span is not explained, so try to add more piers;

6. Glue the bridge to the pier;

7. Tell your teacher that he's too boring.

It is very particular about using glue, do not use ordinary glue, it is best to use structural glue, because it can achieve the strength of steel, and the epoxy resin is also improvised.

1.If there is no upper limit weight, use more high-strength glue such as milky white glue, which has strong shear resistance.

2.Rational design of the bridge deck. According to the point of view of material mechanics, the main material is distributed as far away from the neutral axis as possible, so as to enhance the bending moment of inertia of the bridge deck and enhance the resistance.

3.It is made into a pre-arched shape, which is equivalent to the effect of prestressing, which helps to enhance the bearing capacity.

4.Under the condition that buckling does not occur, the bridge section is made high to enhance the moment of inertia.

5.If there is no restriction of the load mode applied, the paper can be applied as much as possible to be carried under tension, because the paper does not have to consider instability when it is under tension, and its bearing capacity is much higher than the compression bearing capacity.

Although I don't know.

But I think you've found the answer you're looking for.

A4 paper only indicates the area size of the paper size = 210 297mm. There are many specifications of the same size paper, such as 70g, 80g, 120g ......The thickness of the isometric ridge is different. The standard for the thickness of a single sheet of 70 grams of A4 paper commonly used in China is millimeters.

I looked at the A4 paper I used at hand, it was 70g m2, I will give Sun Xian you a reference, I have 70g of paper on hand, 500 sheets have.

If it is 55 centimeters, there are 5,851 gross images.

If you need PPT activity template references.

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Shoot one you don't get used to.

A complete set of group quality development games.

The bases of the Shanghai Tianxia Development Training Center are very good, and their logistics support is also good.

Invincible Beacon Wheel.

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Two people in a group of legs tied together to run to the designated place, group tug-of-war, throw handkerchiefs, it's okay, 3 is good, you can study it if you have nothing to do, and you can add a co later, I hope it can help you.

There are a lot of them, stacking newspapers, a few people step on it, and then fold the newspaper in half and step on it again, the group that insists until the end wins, goes somewhere, divides into groups, and walks according to different routes, whoever arrives first wins, blindfolds and steps on three balloons on a line, relay stepping, which group is the fastest and which group wins, someone directs to hide something somewhere, give a part of the clues, group competition, you can set clues in different places.

Do your own expansion, the money still has to spend so much, the effect is not guaranteed, why not try to expand the company professionally, the training effect is guaranteed, but also to promote the vitality of the enterprise.