APF pioneered the field of effective H-pile point protectors.
A reinforcement cage is then installed and the trench is concreted. Project sites are subject to ever more stringent conditions and so the limits of diaphragm wall techniques are today being pushed even further.
A diaphragm wall is the most cost-effective retaining solution for providing strong soil and hydraulic support, especially where watertightness and a stiff retaining structure are needed to control and protect the surrounding environment against settlement and water drawdown.
For these reasons, diaphragm walls are becoming increasingly popular. Intrafor offers all of the ground engineering techniques that may be required as part of civil engineering or building projects such as metro stations, tunnels, roads and bridges, land reclamations, dams, deep basements, car parks and high-rise buildings.
This includes retaining structures diaphragm walls, sheet piling, contiguous and secant pile wallsfoundations barrettes, bored piles, continuous auger piles, micropiles, H-piles, pre-bored pilessoil improvement grouting, jet grouting, vibro-compaction, stone columns, soil mixingenvironmental protection slurry walls, curtain grout, curtain wall by ground freezing and soil investigation sub-horizontal and directional drilling and coring, ground investigation, laboratory testing.
VSL Services Intrafor builds underground walls and deep foundations up to m in depth for civil engineering and building projects, including metro stations, tunnels, bridges and other structures. Intrafor offers the full range of services from design consulting to execution of the works, using its own equipment pool to achieve the best result in terms of safety, time and costs.
Associated Services Monitoring A full range of techniques to monitor the behaviour of the ground or of a structure, during underground works or afterwards Ground improvement LMC project in HK, soil freezing to construct cross-passage between the 2 tunnels A combination of techniques to improve the ground properties for both temporary and permanent works to enable construction of underground or elevated structures.
VSL can implement a wide variety of these techniques including soil freezing, vibro-flotation, grouting, jet-grouting… Ground investigations a combination of techniques to investigate and assess the ground strata layers, faults, voids, water level and soil properties chemical and mechanical prior to starting construction works.
Precast concrete or preformed mesh facing panels anchored to galvanised steel mesh or polymeric strips to reinforce soil and create retaining structures with a variety of shapes, surface textures and colours. Uses include abutments, ramps and road or rail projects.
Ground anchors or tie-backs. Used for retaining walls, buildings, bridges, dams, unstable slopes and to prevent water-table uplift. Systems include drilled and grouted, post-tensioned stressed passive or active ground reinforcement to provided resistance to uplift and lateral forces.
They can take the form of strands or bars and the system may be temporary during the construction phase or permanent. VSL has developed a complete electrical insulation system for permanent anchorages.
Advantages of Intrafor's Solution Experienced staff Intrafor is convinced that its people are its main and most critical asset. Cutting edge equipment Intrafor owns its pool of specialized equipment composed of some of the most powerful machines available on the market.
This allows Intrafor to be very reactive and able to mobilize the project right upon award which often proves to be a key advantage.
Intrafor proposes construction schemes or alternative approaches. These aspects often prove to be decisive factors in the success of a project. This allows selection of the most suitable methods together with the definition and optimisation of the construction sequences and programme.
Designers remain involved in the construction processes and in the risk management throughout the execution of the work. Thus, they can refine the methods and the design as required to take into account any changes on the site, whether due to ground conditions or other factors.
Contributing to sustainable solutions Limiting the impact on the environment By carefully choosing the best method to improve the soil, ground improvement contributes to limit the impact on the environment.
They are proactive in identifying and communicating their concerns. All employees are given the authority and responsibility to stop works if they feel safety compromised.
Identifying hazards ahead Hazards need to be carefully managed. Intrafor is well versed in safe working methods and makes safety a top priority, as demonstrated by gaining OHSAS certification in A tunnelled alternative was developed to pass beneath the Long Valley without disturbing an environmentally sensitive wetlands habitat, which is home to a number of rare bird species.
After the construction of 3. These connect the two tubes at regular intervals and allow passenger evacuation from one tunnel to the other.
They were built in saturated, mostly decomposed, rock and were therefore very unstable, requiring ground treatment to ensure safe excavation. Construction of three of the passages had to be carried out from the tunnel without any access from the surface.
Intrafor worked with the contractor and engineers to develop a ground treatment scheme based on ground freezing to stabilise the ground during excavation. The ground freezes at this very low temperature, gaining a significant increase of strength as well as becoming watertight, thus making it completely safe for excavation.
The wall is either self-standing or can be temporarily or permanently supported by other means as required. Diaphragm walls have the following advantages they can form part of the permanent structure; they allow for the top-down method of construction; their stiffness limits wall movement during the excavation — particularly of use next to sensitive structures; they are well suited to the construction of underground structures in built-up areas; they bring overall programme savings.
Main components and equipment Cutter Ground excavation by cutter: Typical set up for cutting Clamshell grab A clamshell grab is rope-suspended and operated either by another rope or hydraulically. It can dig trenches of short or medium depth but is less productive than a cutter.A Novel Solution for Restoration of Deteriorated Piles – Part 1 By Mo Ehsani and Mark Croarkin wet layup system.
PileMedic™ allows The H piling bents had 26 to 32 steel 10X42 steel piles that are located behind the barrier wall. • Steel H piles • Precast concrete piles • Steel tubes – top and bottom driven Rewa Bridge, Fiji- Bottom driven steel tubes up to 50m long Huntly Power Station Cooling Tower, Huntly- Pre Drilled H Piles.
9 Bottom-driven steel tubes Additional skin friction resistance in bored piles can be achieved by spiral grooving the socket. Particular Specification for Jacked Steel H-piles exceed 80% of the yield stress of the H-pile material. A control system should rock excavated during pre-boring shall be removed and the pre-bored hole shall be backfilled with sand or other materials, subject to the approval of the SO.
A line of bored piles are installed with long steel H-Sections projecting from them.
The gaps between the H-Sections are then filled with timber inserts, such as sleepers or pre-cast concrete planks. These are slotted in horizontally during the excavation.
Pre-Bored Steel H-Piling system is not only applied in local road constructions, but it is also applied in some small-scale construction of buildings in Hong Kong. There is a typical example, which is the construction of Sheung Wan Stormwater Pumping Station (SWSPS) on Hong Kong Island.
Pile driving is often a cost-effective and time-efficient support method. But because you're working with soil and other features in the earth, there is an element of .