T-Shaped Reamed Pile Composite Foundation Construction
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Solution Overview
Problem
Traditional pile foundations face challenges such as difficulty in sinking precast piles, soil disturbance, inability to pass through hard soil layers, and inadequate bearing capacity and seismic performance, especially in soft soil foundations.
Innovation Solution
The introduction of a T-shaped reamed pile system, which consists of a core pile and a surrounding reamed body, where the reamed body is cast-in-place and has a larger diameter upper section, allowing for easier penetration and increased bearing capacity, and is combined with a composite foundation and a specific construction method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If precast piles are used for foundation construction, then the piles can be precast in construction sites or factories and transported to the pile location, but the pile sinking process causes damage to the pile body and lacks sufficient safety and reliability
Solution Approach 1:
The pile is divided into two distinct parts: a precast core pile and a cast-in-place reamed body. The core pile can be manufactured in advance with quality control, while the reamed body is formed on-site to ensure proper installation and bearing capacity, resolving the contradiction between ease of manufacture and reliability.
Solution Approach 2:
The pile combines two different construction methods into a composite structure: precast concrete core pile and cast-in-place reamed body. This composite approach allows the core pile to benefit from factory premanufacturing while the reamed body provides on-site adaptability and structural integrity, balancing manufacturing ease with reliability.
2Productivity
If precast piles are used as soil compaction piles, then they can be installed efficiently, but they disturb the surrounding soil and cause floating, deviation and warping of the pressed pile
Solution Approach 1:
The reamed body acts as an intermediary element between the precast core pile and the surrounding soil. It is cast-in-place around the core pile, providing a transition zone that reduces direct soil disturbance caused by the precast pile installation, thereby reducing floating, deviation and warping while maintaining installation efficiency.
3Ease of manufacture
If precast piles are used, then they can be precast and transported, but they cannot pass through the hard sandwiched layer which makes the pile length too short and the bearing stratum not ideal
Solution Approach 1:
The reamed body provides a dynamic adaptation capability, allowing the pile to be adjusted on-site to pass through hard sandwiched layers. The cast-in-place reamed body can be formed with appropriate dimensions and depth to navigate varying soil conditions, enabling the pile to reach ideal bearing strata that were not achievable with fixed-length precast piles alone.
4Ease of operation
If cast-in-place concrete piles are used, then they can be constructed on-site, but they need time to set and harden, resulting in longer overall production time and increased production cost
Solution Approach 1:
The pile is segmented into a precast core pile (manufactured in advance) and a cast-in-place reamed body (formed on-site). The core pile eliminates the need for on-site concrete curing time, while the reamed body is a smaller portion that can be cast and cured quickly, significantly reducing overall production time compared to entirely cast-in-place piles.
Solution Approach 2:
The core pile is prepared in advance through precast manufacturing, eliminating the need for on-site concrete setting and hardening time. This preliminary action allows the majority of the pile structure to be in place before the reamed body is cast, reducing overall production time and cost.
Data Source
AI summary
Provided are a T-shaped reamed pile, a composite foundation, and a construction method for the composite foundation, relating to the technical field of civil engineering. The composite foundation is composed of a T-shaped reamed pile, soil between piles, and a cushion layer. The T-shaped reamed pile is composed of a core pile, a reamed body surrounding the outside of the core pile. A depth of the core pile is not lower than that of the reamed body, the reamed body includes an upper reamed body, and a lower reamed body, and a diameter of the upper reamed body is larger than that of the lower reamed body. The core pile is a precast pile, the reamed body is a cast-in-place reamed body, and the cushion layer is a sand-gravel cushion layer, or a reinforced cement-soil cushion layer.