This project was commissioned by the Luoyang Finance Bureau to review the balanced creation initiatives across 100 primary and secondary schools in Luoyang. The scope includes various tasks such as campus road paving, wall painting, canteen maintenance, toilet renovations, and refurbishing turnover rooms in teaching buildings. Due to the sheer volume and diversity of disciplines involved—including roadwork, installation, and interior renovations—the office director coordinated the classification of projects by specialty and assigned them to respective professional teams. This ensured an organized and efficient task distribution.
Given the extensive range of projects, this case study focuses solely on verifying the feasibility of applying BIM technology within small to medium-sized cost management firms. For this purpose, the toilet and septic tank renovation project at Shiqiao Primary School in Dongwangzhuang, Yiyang County, was chosen for detailed analysis.
Project Overview
The project involves the construction of a new toilet facility at Shiqiao Primary School, located in Dongwangzhuang Township, Yiyang County. The building covers an area of 54.35 square meters, consists of a single floor above ground, and stands 3.75 meters tall. It features a brick-concrete structure designed to last 50 years.
Application of BIM Technology in Audit Processes
1. BIM Model Creation
The project utilized Guanglian Da’s latest modeling software, GTJ, to develop the BIM model. Considering the similarity of this tool to other modeling software previously mentioned, an in-depth demonstration is omitted here.
Figure 1: 3D BIM Model of the Toilet at Shiqiao Primary School
2. Bill of Quantities Preparation
The bill of quantities was prepared using quota price information consistent with engineering project standards, which streamlined the process and saved considerable time. Detailed operational guidance on pricing software is available in related literature for readers interested in exploring further.
Figure 2: Prepared Bill of Quantities
3. Verification of Bidding Control Price
After reviewing the client’s submitted paper documents for the bidding control price, the following observations were made:
(1) Toilet and Septic Tank Project – Civil Engineering
- Some engineering quantities submitted were significantly higher than those reviewed. For example, the porous brick wall quantity submitted was 32.53 m², but the reviewed quantity was 30.85 m². Similarly, the rectangular beam quantity submitted was 1.75 m², while the reviewed quantity was 0.81 m².
- There were inappropriate quota selections, such as the 600mm thick Sanqi lime soil cushion layer for the foundation being approved incorrectly. Additionally, plastering standards for walls, squatting toilets, and brick foundations were inaccurately applied.
(2) Installation Project
- The disinfection of the bathroom water supply pipeline should have been excluded and deducted.
- For brick inspection wells, four were submitted for review, but only three were audited. Each well was priced at 1,417.43 yuan, totaling 1,417.43 yuan.
(3) Septic Tank Project
- Several engineering quantities were overestimated. Excavation was submitted as 478.13 m³ but reviewed at 387.28 m³; backfill was submitted as 360.27 m³ but reviewed at 305.28 m³; concrete cushion was submitted as 2.85 m³ but reviewed at 2.5 m³; steel reinforcement was submitted as 3.494 tons but reviewed at 1.47 tons.
- Quota collection was inconsistent, for example, comprehensive scaffolding 17-1 was submitted, whereas internal scaffolding 17-56 was reviewed.
Figure 3: Paper Version of Bidding Control Price
4. Final Amount Confirmation
The engineering budget approval form was edited to reflect the final approved amount, as shown below.
Figure 4: Approved Amount
5. Data Archiving
All project files were compiled in electronic format and submitted to the BIM Application Department. After organization by the relevant staff, these files were provided to the client for ongoing post-project management and support.
Author: Li Yashen (Henan University of Science and Technology)
For learning and communication purposes only. Copyright belongs to the original author. If any infringement occurs, please contact us for removal.
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