JKH

Project OverviewIn May 2018, the village of Modbury in Devon implemented a risk management scheme designed to protect the village from serious flooding. This came after the village experienced its worst flooding in recent history in July 2012. During this month, around 27 homes and businesses were flooded and the A379 became impassable. The company contracted to carry out the installation of drainage solutions was Wills Bros Civil Engineering. In order to properly complete the project, they required the design and supply of custom security/trash screens to fit two existing headwalls in Ayleston Park. Therefore, Devon County Council asked JKH Drainage to supply drain grating for these headwalls.Scope of WorksOur clients contacted us to discuss the options for custom drain grating needed to cover the headwalls in Ayleston Park. We discussed with the client what size and design of grating they needed. In the end, we made the decision that we would supply two custom GMS gratings based on the specified requirements. Each bespoke cranked grating came with a GRP catwalk section, hinged access and fixings as well as installation guides. We supplied the two custom gratings to Wills Bros Civil Engineering who fixed them to each of the headwalls along with the catwalk, hinged access and fixings.Critical IssuesThere were a couple of issues that occurred during the installation process. A few of the bolts and clips that we had supplied were lost on site. However, we were able to quickly send out replacements for these parts at no extra charge.End ResultThe two drain gratings we supplied were both successfully installed on site by Wills Bros Civil Engineering with no further issues reported. The team completed the entire project by November 2018 and well within budget.

When Aquatic Control Engineering (ACE), a company specialising in mechanical solutions for flood defences and biodiversity conservation, faced significant complexity and costs with developing bespoke designs for water control equipment installations, they turned to JKH for help developing a more standardised solution.Recognising the need for a more efficient and cost-effective solution, ACE sought JKH’s expertise to develop a modular precast concrete headwall system that could address their needs.The solutionJKH Ltd collaborated closely with ACE to design a groundbreaking modular tilting weir headwall solution. Utilising their extensive expertise in precast concrete solutions, the team at JKH conducted Design for Manufacturing (DFM) analysis to revise the initial designs to ensure cost effective manufacturing as well as ease of installation.This system was meticulously developed to comprise a simple panel assembly design to offer adaptability for various water level management situations, as well as the flexibility to align with lift capacity and access limitations presented by even the most demanding of sites.The resulting modular design allows for multiple options and accessories, making it suitable for a range of uses including habitat creation, peat regeneration schemes, water level management, housing developments, and general drainage.Key FeaturesModularity: The system’s modular nature provides the flexibility needed to tailor each installation to specific project requirements, it also aids installations in difficult and inaccessible locationsLightweight Construction: The lightweight design reduces lifting demands and minimises ground pressure loadings, enhancing ease of installation and reducing environmental impact.Environmental Consciousness: The pre-cast approach curtails material use and minimises pollution risks associated with in-situ poured concrete methods, promoting sustainability.Seamless Installation: Components are fabricated to minimise labour requirements, ensuring projects stay on schedule without compromising quality.Hardware Options: The system can be outfitted with various hardware options, including tilting weirs, stop logs, floating tilting weirs, screens, flap valves, penstocks, and access options, allowing for extensive customisation.The ResultsThe collaboration between ACE and JKH Ltd resulted in a versatile and efficient modular headwall solution that significantly reduced both installation costs and environmental impacts. The system’s adaptability and ease of installation have proven to be a winning formula for aquatic engineers, enabling them to achieve both efficiency and excellence in their projects.

In January 2017 JKH Drainage Units were asked by Innogy to design a precast structure for a hydro-electric scheme in Scotland.Because of the remoteness of the site it would have been difficult to construct the necessary structure from in-situ concrete.The structure was also restricted by the size of crane that could access the site, so there was a 3500kg weight limit to any one component.Because the sub structure on the site was granite rock, they could not accurately cut a flat foundation.JKH draw up a proposal using a series of 200mm thick pre-cast concrete panels that could be located onto galvanised saddles and positioned using a steel framework within the sub-base of site poured concrete.The whole structure was drawn up in 3D using Solidworks allowing the customer to view the designs in high detail from approval through to installation.

PB Doyle Construction Ltd, a principal contractor, undertook a comprehensive refurbishment of an existing warehouse facility in Mildenhall, Suffolk. As part of Phase 1, over 5,000 m² of new concrete hardstanding was installed. A key element of the drainage strategy involved the installation of large-capacity soakaways to manage surface water run-off from both the roof and hardstanding areas.Our SolutionJKH Ltd supplied a bespoke range of precast soakaway chambers, designed to meet the specific requirements of the site. These bolt-together panel systems offer:Customisable dimensions to suit project needsLightweight construction for ease of handling and installationHigh-capacity chambers capable of holding up to 14,400 litresCover slab options rated from 40kN to 170kN axle loadsIntegrated ‘knock-out’ sections for straightforward pipework connectionOn-Site PerformanceThe modular design significantly streamlined the installation process. PB Doyle’s groundworkers were able to assemble the units quickly using a standard 360 excavator—eliminating the need for cranes and reducing both time and cost.Client Feedback“We found the product very easy to use on site. The precast units were lightweight and could be lifted into position by our 360 excavator. The bolt-together design allowed our team to assemble the soakaways in minutes. The integrated knock-out sections made pipe connections simple and efficient.”“We would certainly recommend this product and look to use it on other projects in the future.” — PB Doyle Construction Ltd