Channel Lining | Batangas, Philippines

324m² of CC8^® Installed for Roadside Drainage

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Project Overview

In October 2019, Concrete Canvas^® (CC) GCCM* was specified as a channel lining solution to provide a diversion for surface runoff from a highway towards an existing drainage channel. The project site is located in the Laurel barangay (administrative division) of San Gregorio in Batangas, Philippines.

Roadside drainage channel excavated and prepared for Concrete Canvas^® lining to divert runoff

324m²

of CC8^® used to provide channel lining solution

6 Person

crew carried out the installation

3 Weeks

for installation to be completed

Solution

The clients initially considered installing concrete canals, however this posed complications due to the requirement for formworks and installation of rebars which would be a lengthy process. Due to the disproportionate steep slopes, the material’s flexibility, minimum requirements for slope trimmings and requiring fewer crew members for install, it was ultimately established that the installation would be more efficient if Concrete Canvas^® was used. The specified CC8^® material was supplied and installed by PGA-Earth Structure Solutions Inc.

The layout for the CC installation was planned prior to works. In preparation for the installation, the channel sections were excavated and anchor trenches dug on each shoulder. A level bar was also used during this process to ensure that the water flow would travel directly down the channel. The ground was then compacted prior to placement of the CC8^®.

Concrete Canvas^® installed from the toe to the crest of the prepared slope, including outfall and corner detailing

Design & Installation

Prior to the installation, the slope was graded and compacted to ensure a smooth surface on which to install the CC. Anchor trenches were then prepared at the crest and toe of the slopes, with the contractor taking care to ensure the excavation of the anchor trenches did not disturb or damage the lining below the top soil.

Bulk rolls of the specified CC5^® were mounted on a spreader beam and suspended from a boom truck at the crest of the slopes for easy deployment. The material was unrolled down the slope, laid vertically with subsequent layers overlapping the last by 100mm. The leading and trailing edges of each length of CC material were captured within the anchor trenches and secured to the substrate using ground pegs at 0.5m intervals. The material below each overlap was hydrated and the upper layer replaced prior to jointing of the overlaps using stainless steel screws applied in a zig zag pattern at 50mm centres. Once each section was completed, the material was hydrated using a water tank and hose with sprinkler head attachment and the anchor trenches backfilled using marl. Where CC terminated against concrete sleepers, stainless steel strips and bolts were used to prevent ingress below the material and ensure a neat termination detail.

CC was easily installed around existing infrastructure

Completed section of roadside channel

Summary

A total of 23,700m² of CC5^® material were installed by a local contractor. A team of ten carried out the works over 24 days, with around ten hours worked per day in hot, dry conditions.

This rate of installation would not in any way be possible using conventional concrete and was not technically viable with the alternative solutions considered for the project. The client had provided a very tight deadline for this project, as they had to make part of the pond operational. The use of CC on this project meant the installation was completed well before the deadline. The project was highly successful, particularly in terms of time savings and ease of installation for the contractor.

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