推拉棚（活动推拉雨棚）是伸缩棚的“升级版”——可整体移动、可收拢折叠，适合临时仓储、大排档、展会等场景。但推拉棚的“长宽高”有明确的行业“天花板”，超过就要妥协安全。

The sliding canopy (activity sliding canopy) is an upgraded version of the retractable canopy - it can be moved as a whole, folded up, and suitable for temporary storage, large stalls, exhibitions, and other scenarios. But the "length, width, and height" of the push-pull shed have clear industry "ceilings", and if exceeded, safety must be compromised.

先搞清楚方向：长度可推拉，跨度和高度固定

First, clarify the direction: the length can be pushed and pulled, and the span and height are fixed

推拉棚的长度方向可以推拉伸缩（两排立柱之间加剪刀架），但宽度（跨度）和高度出厂即固定，后期不能调整。很多人把长度和跨度搞反——“能进出的一面是宽度，不是长度”。

The length direction of the push-pull shed can be extended and retracted (with scissor frames between two rows of columns), but the width (span) and height are fixed at the factory and cannot be adjusted later. Many people confuse length and span - 'the only side that can enter and exit is width, not length'.

三个核心尺寸的“行业红线”

The 'industry red line' of three core dimensions

跨度（宽度） ：非常大20米中间不加立柱，这是行业公认的安全上限。有商家承诺做更大跨度，安全系数没保障——跨度过大，顶部荷载和风载下骨架变形风险剧增。

Span (width): No columns are added in the middle up to a maximum of 20 meters, which is the industry recognized safety limit. Some merchants have promised to make larger spans, but the safety factor is not guaranteed - if the span is too large, the risk of skeleton deformation under top load and wind load will increase dramatically.

高度（边高） ：建议6米以内，非常高不超过8米。镀锌钢管每根出厂6米，超过需焊接，焊接点成为强度薄弱环节。

Height (edge height): It is recommended to be within 6 meters, with a maximum of 8 meters. Each galvanized steel pipe is 6 meters long from the factory, and if it exceeds the required length, welding becomes a weak point in strength.

长度：可无限拼接延长，但越长伸缩阻力越大，需考虑电机功率或手动推拉的可行性。

Length: It can be infinitely spliced and extended, but the longer it is, the greater the expansion resistance. The feasibility of motor power or manual push-pull needs to be considered.

材质配置参考

Material configuration reference

立柱：镀锌圆管（直径可选60mm或75mm），壁厚1.2-1.8mm

Column: Galvanized round pipe (diameter optional 60mm or 75mm), wall thickness 1.2-1.8mm

骨架：40×40mm或50×50mm镀锌方管，壁厚≥1.2mm

Skeleton: 40 × 40mm or 50 × 50mm galvanized square tube, wall thickness ≥ 1.2mm

篷布：PVC刀刮布或汽车帆布，克重≥650g/m?，UPF50+、防水水压≥3000mm

Tarpaulin: PVC knife scraping cloth or car canvas, with a weight of ≥ 650g/m? ， UPF50+、 Waterproof water pressure ≥ 3000mm

底轮：4-5寸万向轮，便于移动

Bottom wheel: 4-5 inch universal wheel, easy to move

选型提醒： 推拉棚主要用于临时性、非永久场景——工厂临时仓库、大排档外摆、物流卸货区、展会活动等。如果是长期固定使用，固定式结构比推拉棚更稳定可靠。

Selection reminder: Push pull sheds are mainly used for temporary and non permanent scenarios such as factory temporary warehouses, outdoor stalls, logistics unloading areas, exhibition activities, etc. If it is for long-term fixed use, fixed structures are more stable and reliable than push-pull sheds.

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