Document Parsing and Chunking for Construction and

What this category of data looks like

Construction and decoration investment research data mainly comes from industry quota standards, project bidding documents, material supplier manuals, construction logs, and site acceptance reports. Update frequency varies by data type:

Material prices are updated monthly
Industry policies and quota standards are updated quarterly or annually
Project-specific documents are updated in real time with construction progress

Document structures include long text construction specifications, structured bills of quantities, and material quotation tables. Fields include project number, material model, unit price, and construction process description. Common pricing and measurement units include yuan per square meter, cubic meter, ton, linear meter, and similar units.

What constraints do these characteristics impose on document parsing and chunking

A high proportion of construction and decoration documents consist of structured data, with many numerical fields bound to units. A general document parsing engine that lacks targeted adaptation will likely experience field and unit misalignment issues.

Long text construction specification paragraphs are lengthy. Forced chunking by fixed length breaks the logical coherence of construction steps.

Single project documents often integrate multiple attachments, with a size over 10MB. Standard parsing timeout settings cannot cover full parsing requirements.

Additionally, some custom document formats do not follow general specifications. Additional field extraction logic is needed to ensure complete parsing.

How to set the configurations

Configuration Item	Recommended Value	Rationale
`PARSE_FILE_TIMEOUT_SECONDS`	`1200 seconds`	Construction and decoration documents often contain multi-page drawings and long text. Single file size can exceed 10MB. Extended parsing timeout is required to avoid task interruptions
`Chunk Length`	`800–1200 characters`	Construction documents include long paragraphs such as construction steps and material descriptions. Excessively long chunks lead to recall redundancy, while excessively short chunks destroy semantic coherence
`Enable Table Structured Parsing`	`Enabled`	Construction documents contain a large number of bills of quantities and material quotation tables. Structured parsing can retain the binding relationship between fields and units, avoiding data misalignment
`UPLOAD_FILE_MAX_SIZE`	`20 MB`	Single construction project documents often integrate multiple attachments. The upload limit needs to be relaxed to adapt to business needs
`Custom Parsing Script`	`Calibrated via actual testing`	Some non-standard construction document formats require scripts to supplement field extraction logic, adapting to personalized parsing requirements
`Chunk Merge Threshold`	`100 characters`	Construction documents contain short paragraphs of construction notes. Merging adjacent short chunks ensures semantic completeness

The parameter values provided on this page are all conventional recommendations, used as a starting point for configuration. Actual values are affected by material forms, data volume, and business rules. Specific issues require specific analysis. It is recommended to test on your own samples before finalizing.

Three common mistakes

Phenomenon: When uploading a decoration PDF document larger than 10MB, the console returns the error timeout of 360000ms exceeded. Cause: The PARSE_FILE_TIMEOUT_SECONDS parameter is not adjusted. The default timeout duration is insufficient to complete parsing of multi-page drawings and long text.
Phenomenon: The parsed material list splits unit price and unit, such as splitting "280 yuan per square meter" into separate fields. Cause: Enable Table Structured Parsing is not enabled. The general parsing engine cannot recognize the binding relationship between fields and units in decoration documents.
Phenomenon: In FastGPT 4.8.10, after chunking with a custom delimiter, ultra-long segments are not further split. Cause: The value range of the Chunk Length parameter is not confirmed, and the secondary splitting logic for ultra-long segments is not covered.

How to confirm the configuration is correct

Upload a single decoration PDF document larger than 10MB, check whether the parsing task status is completed within a reasonable time frame, with no timeout errors.
Export the parsed structured data, verify that the unit price, unit, and model in the material list are fully bound, with no splitting or misalignment.
Adjust the Chunk Length parameter, randomly extract chunked content, and verify that long paragraphs such as construction steps and material descriptions are not forcibly split.
Upload a decoration document containing custom fields, run the custom parsing script, and confirm that the target fields are correctly extracted and written into the parsing result.

Question material comes from public community discussions. Configuration values are common starting points and should be measured against your own samples. Verified on 2026-09-14.