Data Characteristics of This Category
Construction engineering investment research related data mainly comes from bidding announcements, construction drawing design documents, cost estimate books, industry technical standard drawings, and ongoing project ledgers. Data update rhythm adjusts with project progress. Individual project documents have low update frequency, while batch project clusters have higher update frequency. Document types include PDF with embedded drawings, Excel cost sheets with structured fields, and Word documents with technical parameters. Fields include building area (㎡), steel usage (t), floor height (m), material brand and model. Overseas projects also involve parameters related to imperial unit conversion.
Constraints on Parsing and Chunking From These Characteristics
The characteristics of construction engineering documents impose multiple constraints on the parsing and chunking process. Bidding PDFs often contain mixed multi-page scans and tables, so structured table information must be retained; extracting only plain text does not meet requirements. Excel cost sheets have multiple sheets and nested fields, so splitting by sheet and field dimensions is required; full-length text processing is not suitable. Technical standard drawings contain many formulas and legends, so non-text elements must be skipped while retaining parameter associations. Mixed units in overseas projects cause unit confusion after parsing, so unit standardization must be completed before chunking. Long documents such as full construction drawings exceed the default chunk length, so segmentation logic must be adjusted to avoid breaking critical parameter associations.
Configuration Settings
| Configuration Item | Recommended Value | Rationale |
|---|---|---|
PARSE_FILE_TIMEOUT_SECONDS | 300–600 seconds | In construction engineering investment research scenarios, single documents often contain multi-page scans and complex nested tables, resulting in long parsing times. This parameter range avoids parsing interruptions caused by short timeouts and ensures complete ingestion of investment research data |
UPLOAD_FILE_MAX_SIZE | 1000 MB | Single construction engineering drawing PDF or drawing files have large file sizes, this value covers the upload needs of most large investment research documents |
maxChunkSize | 800–1200 characters | In construction engineering investment research scenarios, documents contain associated technical parameters such as steel usage and corresponding floors. This length retains parameter context and avoids breaking technical associations that support investment research analysis |
chunkOverlap | 100–200 characters | Core parameters of construction engineering often appear across segments. Overlapping settings retain contextual associations and improve retrieval matching accuracy in investment research scenarios |
PARSE_EXCEL_ENABLE_MULTI_SHEET | Enabled | Construction engineering Excel cost sheets often store data by specialty across sheets. Enabling this setting fully extracts structured content from all sheets and avoids missing investment research data |
PARSE_PDF_EXTRACT_IMG_ALT | Enabled | Construction engineering PDF drawings contain embedded legends and annotations. Enabling this setting extracts image alternative text, supplements technical details in chunked content, and supports investment research analysis |
The parameter values provided on this page are common recommended starting points for configuration. Actual values are affected by material format, data volume and business rules. Specific issues require individual analysis, and it is recommended to test on your own samples before finalizing settings.
Three Common Misconfigurations
- Phenomenon: The platform returns a 408 Request Timeout error or parsing task failure when uploading construction engineering documents. Cause: The
PARSE_FILE_TIMEOUT_SECONDSparameter is not adjusted, and the default timeout duration is insufficient to complete parsing of complex documents. - Phenomenon: When searching the knowledge base, the returned Excel data is less than the actual imported content, and fields related to overseas usage locations cannot be retrieved. Cause: The
PARSE_EXCEL_ENABLE_MULTI_SHEETconfiguration is not enabled, resulting in failure to parse and store structured data from some sheets. - Phenomenon: Knowledge base search results only match core text, and do not include auxiliary data such as material models and unit conversion rules. Cause: Auxiliary information extraction configuration is not enabled, or the chunk length is set too short, truncating non-core but critical auxiliary field content.
How to Verify Correct Configuration
- Upload a single large-format construction engineering PDF document, check the parsing task status, confirm no timeout errors occur, and verify that the
PARSE_FILE_TIMEOUT_SECONDSsetting matches the parsing time of the current document. - Import a construction engineering Excel cost sheet with multiple sheets, traverse the search fields of the knowledge base, confirm that structured data from all sheets has been fully extracted and stored.
- Search for document fragments containing overseas project parameters, confirm that search results include auxiliary information related to unit conversion, and verify that auxiliary data has been included in chunked content.
- Adjust the chunk length parameter, compare the chunked results of the same long document, confirm that the contextual association of core technical parameters is not broken.
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.