How to minimize construction errors in steel construction?

2025-03-27 15:38:33

In the manufacture of steel box girders for the Hong Kong-Zhuhai-Macao Bridge, the digital pre-assembly technology controls the joining error at ±2mm; the 120,000 rods of the phoenix spreading its wings roof cover of the Beijing Daxing Airport realize millimeter-level installation through intelligent measurement ... These practices reveal that modern Steel Structure engineering is pushing the construction error control to the sub-millimeter era through technological innovation and refined management.

I. Error Pre-control in Design Stage

BIM forward design optimization

The steel structure project adopts all-discipline collaborative design platform, and a stadium project eliminates 1265 design conflicts through collision detection. Parametric modeling technology reduces the error rate of complex node processing diagrams to 0.3%, and improves the accuracy by 8 times compared with traditional 2D design.

Digital twin pre-assembly

Simulating the whole process of Steel Structure Engineering installation in a virtual environment, a super high-rise project in Shenzhen found 79 potential interference points in advance. The error transfer algorithm developed by it predicts that the cumulative error is ≤L/15000 (L is the length of the member).

Second, material processing accuracy control

Intelligent cutting equipment upgrade

With the introduction of 20kW fiber laser cutting machine for steel structure project, the cutting speed of 30mm thick Q355B steel plate reaches 1.2m/min, and the section perpendicularity error is ≤0.05mm. After the application in a bridge project, the bevel processing time is shortened by 70%, and the bevel angle error is ±0.5°.

Robot welding system

Equipped with laser tracking welding robots, the welding seam positioning accuracy of ±0.2mm is realized in steel structure projects. after application in a venue project in Hangzhou, the passing rate of butt weld seam of 60mm thick plate is increased from 92% to 99.8%.

Precise regulation of installation process

Three-dimensional laser scanning technology

The steel structure project adopts one million point cloud acquisition equipment per second, and it takes only 4 hours to complete the scanning of 32,000 square meters of roof in a terminal building project. Through intelligent comparison between point cloud and BIM model, 2.3mm installation deviation is found and corrected.

Intelligent hydraulic synchronized lifting

A steel structure project in Shanghai applies 2,000-ton lifting system with 32 lifting points synchronized with an accuracy of ±1mm, and the PID control algorithm developed by the company controls the lifting speed fluctuation of 200m-span steel joist at ±0.5mm/s.

Fourth, measurement technology innovation application

Beidou+5G Positioning System

Intelligent measurement terminals are deployed in steel structure projects, and a stadium project realizes real-time positioning accuracy of ±1mm in the whole area, and the dynamic compensation algorithm developed by the company eliminates 2.7mm measurement error caused by temperature deformation.

Intelligent Total Station Network

Assembling a monitoring system containing 12 measurement robots, a bridge project tracked 500 key points in real time. Through Kalman filtering algorithm, the dynamic measurement error is reduced from ±3mm to ±0.8mm.

V. Reconstruction of process system standards

Intelligent screwing of high-strength bolts

With the application of torque-angle dual-control electric wrenches in steel structure projects, a high-speed railway station project realizes the error of preloading force of 10.9S-grade bolts ≤3%. The anti-torque leakage prevention system developed by the company ensures 100% torque calibration at each node.

Modularized Construction Technology

A project in Guangdong, Hong Kong and Macao Bay Area adopts 18m×12m standard modules, with on-site assembly error ≤ L/8000. the six-degree-of-freedom adjustment device developed by the company realizes module docking accuracy of ±0.5mm.