---
title: "栏杆间距：规范要求与等分排版"
description: "4 英寸小球规则、到底需要多少根栏杆，以及如何标记等间距而不产生累计误差。"
image: "https://nestingcalc.com/og-default.png"
url: "https://nestingcalc.com/cn/guides/baluster-spacing-code/"
locale: "zh-Hans"
---

# 栏杆间距：规范要求与等分排版

4 英寸小球规则、到底需要多少根栏杆，以及如何标记等间距而不产生累计误差。

## 从规范出发，而不是从外观出发

每一道护栏和楼梯扶手都有一条硬性限制：100 mm / 4 英寸的小球不得穿过任何开口。量的是栏杆完成面之间的净距，而不是中心距。[栏杆立柱间距](https://nestingcalc.com/cn/baluster-spacing-calculator/) 直接执行这一限制——输入你的规范允许间隙，它会把所有间隙等分到该值以下。

## 栏杆根数是怎么算出来的

对长度 L、栏杆宽 w 和最大间隙 g，最少根数为 ⌈(L − g) / (w + g)⌉。直觉：每根栏杆加一个间隙消耗 w + g 的长度，而最后一个间隙可能已计入限制。计算器随后把剩余空间分成 n + 1 个等间隙，包括两端那两个。

## 标记边缘，而不是中心

用挡块定位或从一根立柱量起，按排版图那样标记每根栏杆的左边缘。先标中心再按栏杆宽度平分是典型的累计误差——到远端立柱时你已经偏了整整一根栏杆。

## 要避免的三个错误

第一，按中心距而不是净面间距。第二，忽略端部间隙——它们同样要满足规范限制。第三，用立柱中心距而不是立柱面之间的净距；先减去立柱宽度和扶手外挑。

## 动锯之前先检查

先在甲板上用胶带把位置排出来，拿小球模板（胶合板上挖一个 4 英寸孔）靠在各个间隙上，然后再切。改窄一根栏杆会让所有间隙重新分布——正如 [线性切割计算器](https://nestingcalc.com/cn/linear-cutting-calculator/) 方案里一件工件变化会让所有切割重新分布一样。

[栏杆立柱间距](https://nestingcalc.com/cn/baluster-spacing-calculator/) [打开线性切割计算器](https://nestingcalc.com/cn/linear-cutting-calculator/)

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