The main beam of the product is a truss girder structure which is welded by a rectangular steel group, and the cross section of the main beam is an inverted triangle.

该主梁与传统正三角桁架相比有以下几种优势：

Compared with the traditional positive triangle truss, the main girder has the following advantages:

1、 上下弦杆截面相差不大，形心位置靠近与截面中心线接近，受力更加合理。

1, on the lower chord section difference, centroid position near the section center line, more reasonable stress.

2、腹杆系统为由原来的大部分为受压杆件变成了大部分为受拉杆件，更充分利用了材料的性能。

2, the ventral rod system on the ground for the most part of the compression bar into a majority of the tension bar, more fully utilize the material properties.

3、腹杆采用矩形钢：传统正三角桁架用的角铁在运输或使用中遭碰撞和挤压容易变形，导致安全隐患，矩形钢抗侧向冲击力强，不易变形。

3, the traditional rectangular steel truss with triangular truss are: iron in transportation or use by collision and extrusion is easy to deform and cause safety hazards, anti lateral impact force of rectangular steel is strong, not easy to deformation.

4、主梁截面是规则的三角形，可叠起来运输，运输方便。

4, the main beam section is a regular triangle, can be stacked up and transport, convenient transportation.

5、制作工艺上比原来的正三角主梁焊接点和焊接量大大减少，减小了制作过程中产生的内应力危害。

5, the production process than the original triangle main beam welding point and the amount of welding is greatly reduced, reducing the production process of internal stress.

6、本产品的支腿可以是钢管腿、花架腿、包厢腿，用户有很大的选择空间。

6, this product can be leg steel legs, legs, legs flower box, users have a lot of options.