The site you are looking at is called "Engineering Knowledge Cards".
It organizes the scattered, easily misremembered, hard-to-look-up pieces of engineering construction — whether a certain provisional cost should be counted, whether a standard has already been withdrawn, which quota item a bill-of-quantities entry maps to, whether a justification actually holds — into individual cards. Each card states its conclusion in one sentence, cites the exact standard or quota it relies on (JGJ, GB and similar series), and opens to a full explanation.
These cards are not hand-written, nor scraped from the web.
They are distilled automatically by the Engineering Assistant (engprime.cn) while it helps engineers get real work done — with evidence-constrained answers, so every card is traceable back to its source.
The Engineering Assistant is built for engineering work in the Chinese construction industry. It mainly does three things.
Budget estimating: from scheme-level estimates to quantities, unit rates and fee accruals — the numbers come out computed and cross-checked, not from rule-of-thumb guesses.
Document & standard search: current standards, mandatory provisions and local regulations, searchable — including whether a clause has been superseded and by what.
Organization knowledge base: questions asked inside your organization's projects are retained as reusable, searchable knowledge, so accumulated experience does not walk out the door.
Because every answer has to trace back to a specific clause or quota item, the knowledge points that come up repeatedly — and hold up under verification — gradually accumulate. The high-confidence, genuinely reliable part of that is curated into the public cards you see here.
How the cards relate to the main app
In short: the cards are settled, public and stable knowledge; the main app is the workbench where you can ask in real time, follow up against your own project, and pull the full source text.
A card helps you quickly see how a question is generally handled. To apply it to a specific project, head to the main app and keep asking there — every card links to the main app with attribution, so you can try it from any card.
Who it's for
If you are a cost engineer, estimator, consultant, auditor, designer or reviewer — or anyone who regularly deals with schemes, standards, quotas, bills of quantities and legal clauses and needs code-backed answers — these two will likely help.