Single Operator Trenching Device for HDPE Pipe Installation

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Solution Overview

Problem

The construction of leach lines in septic systems is labor-intensive and inefficient, particularly when using flexible HDPE pipes, as conventional methods require multiple operators and manual labor to lay and secure pipes within trenches, leading to inaccuracies and increased costs.

Innovation Solution

A leach line extrusion device that allows a single operator to lay flexible tubular materials, such as HDPE pipes, by extruding the pipe and aggregate simultaneously along the trench bottom, with the pipe secured in place and geotextile fabric applied, using a device towed by excavation equipment, reducing manual labor and improving accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional manual pipe laying methods are used, then multiple operators and extensive manual labor are required, but this increases labor costs and reduces installation efficiency

Engineering Contradiction:

Improveinstallation efficiencyVSAvoidnumber of operators required

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent combines multiple functions (trenching, pipe laying, aggregate placement, and fabric installation) into a single integrated device that can be operated by one person. The extruder device merges the capabilities of what previously required separate operations by multiple workers into one automated system, directly resolving the contradiction between productivity improvement and device complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The device performs operations automatically once positioned in the trench. The extruder self-feeds aggregate from its hopper, self-regulates pipe placement depth using guide members, and automatically installs fabric without requiring continuous manual intervention, enabling single-operator functionality while maintaining high productivity.

Inventive Principle:

Principle #25Self-service

2Ease of manufacture

If flexible HDPE pipe is used, then installation cost is reduced and joint gluing is eliminated, but the pipe is too flexible to stay in place during aggregate placement

Engineering Contradiction:

Improveinstallation costVSAvoidpipe position stability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent introduces guide members as intermediary elements between the flexible pipe and the aggregate material. These guide members temporarily support the pipe at the correct elevation and position during the critical phase of aggregate placement, preventing the flexible pipe from moving or sinking. Once aggregate placement is complete, the guide members are removed, leaving the pipe securely positioned by the aggregate itself. This intermediary mechanism enables the use of cost-effective flexible pipe while ensuring position stability during installation.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If trench is left open for extended periods during manual construction, then workers can complete installation, but the risk of cave-ins increases

Engineering Contradiction:

Improveinstallation timeVSAvoidcave-in risk

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The extruder device enables continuous installation operations as it moves through the trench in a single continuous motion. The device continuously extrudes pipe, places aggregate, and installs fabric without interruption, completing the entire installation process in one pass. This continuous operation minimizes the time the trench remains open and reduces exposure to cave-in hazards, while maintaining high productivity through automated continuous construction.

Inventive Principle:

Principle #20Continuity of useful action

4Productivity

If aggregate is placed blind by machine, then installation speed increases, but depth control becomes very difficult and requires extensive manual grading

Engineering Contradiction:

Improveaggregate placement speedVSAvoidaggregate depth control

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent replaces manual mechanical grading operations with an automated depth control system. The extruder uses guide members with adjustable positions that mechanically constrain the pipe and aggregate to precise depths. The guide members act as automated depth references, eliminating the need for manual grading while maintaining both speed and precision. This substitution of manual mechanical operations with an automated guided system resolves the contradiction between placement speed and depth control accuracy.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS9057458B2Single operator trenching pipe laying device and method

Publication Date: 2015.06.16 RETTKOWSKI BRADY A

AI summary

A single operator extruder main body dispenses aggregate, pipe and geotextile during a trenching operation. Lifting elements allows the main body to be manipulated by a single operator.