Underground Space Frame Structure with Inverted Construction Sequence

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Solution Overview

Problem

Traditional underground space frame structure construction is complex, inefficient, and wasteful, involving multiple steps and significant material usage, with safety hazards from high-rise formworks.

Innovation Solution

The method involves constructing vertical support piles without a foundation pit, using a top-down sequence, with reinforced concrete bored piles having varying cross-sections, and connecting multi-layer horizontal components to these piles during excavation, eliminating the need for independent foundations and scaffolds.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If traditional sequential construction method is used (independent foundation first, then columns, then beams), then construction can be done in standard steps, but construction period is extended and resource investment increases

Engineering Contradiction:

Improveconstruction process standardizationVSAvoidconstruction period

Core Design Contradiction:

Ease of manufactureVSLoss of time

Solution Approach 1:

The patent inverts the traditional construction sequence by constructing vertical support piles first before excavating the foundation pit, and then constructing horizontal components from top to bottom during excavation. This reverse sequence eliminates the need for scaffolds and extends construction time, allowing simultaneous pile construction and excavation operations

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent performs preliminary construction of vertical support piles and upper horizontal components before foundation pit excavation is completed. This preliminary action allows subsequent construction steps to proceed without scaffolding and reduces overall construction period by overlapping construction activities

Inventive Principle:

Principle #10Preliminary action

2Reliability

If traditional construction method with scaffolds and formworks is used, then structural support during construction is provided, but resource investment and material waste increase significantly

Engineering Contradiction:

Improveconstruction safetyVSAvoidmaterial waste

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

By inverting the construction sequence to build piles first and construct horizontal components from top to bottom during excavation, the patent eliminates the need for extensive scaffolding and formworks, significantly reducing material waste while maintaining construction safety through the self-supporting nature of the inverted sequence

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent merges the construction of vertical support piles with the excavation process, and combines horizontal component construction with the excavation sequence. This merging eliminates the need for separate scaffold structures and reduces material waste by integrating multiple construction activities into a unified process

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If independent foundations and waterproof boards are constructed separately, then foundation waterproofing is achieved, but construction steps are increased and efficiency decreases

Engineering Contradiction:

Improvefoundation waterproofingVSAvoidconstruction efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent merges the construction of independent foundations with the vertical support piles, and integrates waterproof board installation with the horizontal component construction process. This combining of previously separate steps into unified construction sequences improves productivity while maintaining foundation waterproofing reliability

Inventive Principle:

Principle #5Merging (Combining)

4Strength

If high-rise formworks are used for column construction, then vertical columns can be constructed, but safety hazards increase and construction complexity increases

Engineering Contradiction:

Improvecolumn vertical constructionVSAvoidsafety hazards

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

By inverting the construction sequence to build vertical support piles first using drilling methods rather than traditional formwork, and then constructing horizontal components from top to bottom during excavation, the patent eliminates high-rise formworks and associated safety hazards while maintaining column construction capability

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent replaces the mechanical formwork system with drilling and reinforcement cage insertion methods for vertical support construction. This substitution eliminates the need for high-rise formworks and their associated safety risks while achieving the same structural outcome

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS20250101704A1Underground space frame structure and construction method thereof

Publication Date: 2025.03.27 SHANDONG UNIV

AI summary

An underground space frame structure includes vertical support piles and multi-layer horizontal components. Each of the vertical support piles includes a pile body vertically disposed in a pile hole before excavating a foundation pit. The pile body includes an upper pile body and a lower pile body. The upper pile body is a rectangular body, and the lower pile body is a cylindrical body. An expansion section is located between the upper pile body and the lower pile body. A cross-sectional area of the expansion section is greater than a cross-sectional area of the upper pile body and a cross-sectional area of the lower pile body. The upper pile body, the expansion section, and the lower pile body are coaxially arranged from top to bottom in the pile hole. The multi-layer horizontal components are constructed from top to bottom.