Wastewater
Building Sanitation
Rubber
BENEFITS OF POLYETHYLENE MANHOLE
Greater efficiency
- Perfect water tightness
Practically guaranteed for life, the cases of infiltration are reduced to a minimum. Protection against possible increases in the groundwater level is ensured; the quality of the gaskets is guaranteed to withstand internal and external pressures of up to 0.5 bar. - Resistance against every type of attack
Impenetrable even when they are subjected to the action of the chemical agents present in the ground or in waste water; stable even in the case of abrasions or mechanical stresses. - Strength and flexibility
The considerable adaptability to any ground and its natural subsidence prevents and reduces the possibility of failure; the stability criteria comply with the severest international earthquake standards.
Reduced costs
- 1. Easy installation
The significantly lower weight of the elements (on average 40-30 kg) enables simple and fast installation. Transport costs are lower, it is not necessary to use heavy machines even in limited spaces or in difficult ground conditions, the installation time is much shorter. - 2. Adaptability
The manholes are designed so that they can be connected to every type of pipe; it is also possible to connect a pipe long after installation, as only 100% virgin HDPE is used. - 3. Lower maintenance costs
Chemical resistant and durable seal. Once installed, HDPE manholes do not require maintenance for a very long time.
WIDE RANGE INFINITE COMBINATIONS
ALWASAIL flexible and multifaceted system satisfies any possible need: the vast assortment of products is designed and manufactured to combine into a wide range of configurations, which offer the most reliable and economical solution even for the most complex projects.
ALWASAIL offers a complete and innovative range specifically developed along two parallel concepts:
The Elements System
The manhole is conceived as a combination of separate elements to be assembled on site.
The advantages of this solution are that it may be adjusted to meet the specific site requirements and it is very easy to use. The parts are all marked with the exact height and they can be assembled on site by low skilled personnel.
Mechanical equipment is not needed for lifting and handling. Water tightness is guaranteed up to 0.5 bar by EPDM gaskets.
It is suitable for installation where:
- Unmapped networks are present
- Space is tight
- Design is incomplete or uncertain
- Access for heavy machines is difficult
Base Elements
- Straight Canal Base: Suitable for linear sections, installed normally every 50 meters to enable easy cleaning with waterjets.
- Angled Canal Base: To allow inspection at changes of direction, where clogging and obstructions are possible. (available with 15°, 30°, 45°, 60°, 75°, 90° angles, in both right and left directions).
- 2-3-4 or 5 Inlets Base: For inspection at the confluence of secondary lines.
- Multiinlet Base: To create an inspection chamber when one or more users have to connect even at a later stage and at any angle without any constraint.
- Spherical Bottom Base: To create an inspection chamber where it may not be made with standard bases.
The Monolithic System
The manhole is supplied in a combination of elements already assembled and welded at the factory.
The advantages of this solution are the speed of installation and the ease of storage. This is the preferred choice on any green field project sites.
Lightweight machinery is sufficient for the lifting and handling. Water tightness is guaranteed up to 0.5 bar by extrusion welding, carried out by skilled and certified personnel.
It is suitable for installation where:
- Groundwater may be present
- There is a time constraint
- The workforce is unskilled
- It is a new project site
Upper Units
The upper unit may be supplied with open top diameter of 600 mm, 630 mm or 700 mm in two different versions:
- Concentric cone
- Eccentric cone
These may in turn be supplied in 4 different types:
- Without ladder
- With integral PE ladder
- With GRP or Stainless Steel ladder
For safety reasons, the first step is always fitted 50 cm below ground level.
The elevations for models with a diameter up to 630 mm are supplied with variable heights.
Elevations with 800 mm, 1000 mm and 1250 mm diameters may be supplied with heights of 500 mm and 1000 mm, again in 4 different versions according to the chosen type of ladder.
The Ladders: Extra Safety
Maximum safety for the operators: compliance with EN 13598 standards guarantee the quality and safety requirements of the ladders.
Guaranteed Joint
The coupling system guarantees water tightness up to 0.5 bar by using ALWASAIL “JG” type double lip EPDM gaskets or by extrusion welding carried out by skilled and certified personnel.
More than 30 years in the business, focusing its Technological Expertise on Inspection Chambers allow ALWASAIL to be free from any constraint, which might arise if it would also be producing Pipes.
Constant commitment ensure that ALWASAIL is always up to date with the most modern technologies and standards for sewerage systems. With the backing of the Engineers and Marketing Managers, ALWASAIL researchers cooperate with the most important international pipe manufacturers, to ensure that the most suitable and safe coupling system is always available.
Whether polyethylene, polypropylene, clay, cast iron, fiberglass or PVC pipes are used, ALWASAIL manhole is able to provide the necessary compatibility to guarantee success for the customer’s project.
CONNECTIONS TO ANY NETWORK
Thanks to its focus on manhole technology, AL WASAIL leaves the designer completely free to choose the materials to be used for the sewerage system; AL WASAIL manholes may be connected to any type of pipe selected for the network. The use of AL WASAIL manholes does not affect the design choices for rest of the system. Pipes with nominal diameters of 160 mm to 600 mm may be connected depending on the type of pipe and the type of manhole.
The designer may select the most suitable pipe, supported by AL WASAIL technicians, who are available to assist the Customer in the development of the best design.
Adapters and Gaskets are available or the following types of pipes:
- POLYETHYLENE
- CAST IRON
- POLYPROPYLENE
- CLAY
- GRP (FIBERGLASS)
- PVC
- CORRUGATES PIPES
The sleeved couplings of the PVC and HDPE pipes may be directly fitted in the manholes as required by European Standards. The current range of adapters and gaskets is being continuously expanded and developed in order to satisfy the needs of the innovations constantly introduced to the market.
AL WASAIL gaskets may compensate for misalignments of up to 5° in all directions; they are easy to install and safe thanks to their double lip design. Water tightness under a pressure of 0.5 bar or a vacuum of 0.3 bar is guaranteed, thereby complying with the requirements of EN 13598-2 standards.
The installation procedure is one of the strong points of AL WASAIL HDPE manhole. The faster installation time, reduced manpower requirements, light lifting gear and ease of connection to the sewerage system are just some of the factors which contribute towards reducing the installation costs by up to 50% compared to an equivalent solution with concrete manholes.
What’s priceless, is the absolute safety for the operators involved in the installation operations, thanks to the lightweight of the elements and the ease of handling.
In all the difficult situations which may be encountered – presence of groundwater, limited space, access difficulties – the solution proposed by AL WASAIL is often the only practical one.
INSTALLATION
The installation of AL WASAIL manhole is easier, faster and safer compared to a concrete manhole. The final result is a significant saving on costs.
PREPARATION
- Add 15 cm to the depth of the manhole and 60 cm to its diameter.
- Form a 15 cm thick bed from loose material (coarse sand or fine gravel) and compact to not less than 90% of the Proctor Standard.
- Prepare the inlets and outlets on the base of the manhole and fit the specific gasket.
- Place the base on the bed and check that it is level. Completely backfill the base with the same material and the same compacting procedure as the bed, proceeding by layers of 30 cm.
- If the manhole is supplied in elements, proceed with the construction of the manhole.
INSTALLATION
COUPLING GASKETS: use the cup wheel cutter to cut the hole and fit the gasket.
CONNECTION WITH PIPES: clean the gasket; lubricate it and push the pipe inside the hole in the manhole as far as the stop point.
ELEVATIONS AND UPPER UNITS: after checking the perfect positioning of the gasket, clean and lubricate the housing surface and groove; the elements can then be assembled merely by pressing the body weight.
If necessary, cut the top neck of the element by following the marked lines. The hole may be backfilled after construction, taking care to use suitable material, and compact in 30 cm layers to not less than 90% of the Proctor Standard. Thanks to the particular elastic properties of AL WASAIL gasket, any later connections to the manhole (private users, drains, etc.) may be carried out even after installation.
HEAVY LOADS: If the manhole is installed on a roadway or in areas subjected to heavy loads (group 3 or higher EN 124 – 1999), a concrete slab is necessary. The slab must be fitted in the ground compacted to a density of not less than 95% of the Proctor Standard.
INSTALLATION IN THE PRESENCE OF GROUNDWATER
In the presence of groundwater, any buried structure is buoyed up by a force equal to the volume of water displaced (Archimedes’ Principle), thereby putting the stability of the structure at risk. It is vital that the design takes into account this phenomenon.
The anti-buoyancy rings designed by AL WASAIL are special but simple devices molded directly in the structure of the HDPE manhole to guarantee the stability of the installation even in difficult conditions.
Calculations show how, under even the most critical conditions, the manhole maintains its stability. Al Wasail is able to verify the Customer’s Project situation, taking into account:
- Deadweight of the manhole and its cover
- Weight of the soil placed directly on the terminal element of the manhole
- Weight of the soil placed on the anti-buoyancy rings
- Weight of the truncated cone portion which rests on the deepest anti-buoyancy ring
- Connection pipes, which are cut or withdrawn to raise the manhole
- Friction between the walls of the manhole and the particular surrounding soil
For more information about this product and its related items, you may check and browse the catalog below:
