Erukku india pvt ltd are designed to suite the best of Construction practices defined by all segments of businesses. Currently we have the following models defined for our service
- Turnkey Model
- Contract Model
This model is for companies who wish to work with us for a very short notice. In this model the entire size of Work is known to the process of Construction and is handled hand in hand with the client.This model ensures that quality & Effective ness of the work provided to our client at a very fast Speed.
“A well-organized site facilities inventory control, cuts travel times, reduces noise and dust, prevents obstructions and interference, increases safety and security, and improves site access”
Considerations affecting the site layout are: Efficiently using site space to accommodate resources throughout a construction project is fundamental to success of a project. So optimizing the construction site layout using physical and computational models is of interest to many researchers. Site Layout has a great effect on project costs, therefore, models are used to simulate the different site layouts and choose the best one.
Equipment’s and machines
- Drill rig, compressor, excavators, explosives
- Cranes, hoists, trucks
- Welding truck
- Lumbers (laggings), liners, ribs, tie rods, support beams, tie wire
- General purpose concrete, concrete forms, concrete pump, rebar’s
- Water pumps
- Illumination and electrical equipment
- Communication systems
- Personal protective equipment
- Ventilation System
- Instrumentation to determine the concentration of flammable gases
The major point before the Excavation work start for the Shaft :- work is
- Location of shaft point with having the detail of the utilities at working point.
- Geotechnical Condition from the customer related to the sub soil and to find out the load capacity of the soil.
Scope of area for this Model is small few are suggested by us such as:
- Shaft making
- Lagging and Anchor work
- Excavation work
- Brick work
- Breaking work
- Soil Disposal work
- Dewatering works
- Material supply
We are using this Model to cut the cost of Manpower instead of using Monthly, we use our manpower as a short term with start to end.
Through this model Erukku india pvt ltd worked with their skilled construction professionals at clients’ site for a defined period of work order and up to demobilization of Manpower with site handover.
Organisations that require skilled professionals for MTBM skilled persons can take our professionals by a particular assignment from us and enabling them to hire the right skilled professional for the required period of time.
We at Erukku india pvt ltd are committed to maintain a position in construction business with self-contained divisions for various disciplines of engineering such as:
- Shaft construction
- Braking work
- Pilling Work
- All civil work
Our policy is to understand the customer needs, expectations, and meet commitments through:
- Optimizing utilization of resources.
- Adapting state of the art of technology
To achieve Customer Satisfaction, We pursue:
- Best business Practises.
- Initiatives that demonstrate world —Class Performance in all our deliberations.
Our Quality system will be strictly adhering to, as we continually strive to improve its effectiveness by:
- Establishing & reviewing Quality objectives.
- Tracking key measure of process control.
- Encouraging employees suggestions
Machineries list of Erukku india pvt ltd
- Hydra From 12 ton to 15 ton
- Excavator Machine
- DG Sets From 62Kva to 250Kva
- Dewatering pumps From 3Hp to 20Hp
Method Statement of Shaft Construction
Shaft Excavations are required for the pits work _Shaft should be located where they can facilitate the construction activities without disrupting traffic flow, environmentally sensitive areas, commercial business, or nearby residence.
Important design and construction consideration for shaft includes:-
- Locating the shaft properly.
- Sizing the shaft to efficiently perform the work.
- Selecting the Appropriate shaft excavation support methods.
- Determining the ground —water control system that will provide a dry and stable shaft excavation.
Appropriate shaft construction is essential for the successful project. Inadequate shaft can affect the quality of work and adversely impact existing buildings, utilities and other facilities.
Shafts are vertical openings which are driven downward. Decisions about the size, shape and positioning of shafts and raisings are taken based on the purpose they are intended to serve. Usually circular shafts are preferred in almost all situations because they are very stable. Also, when strata should be built, we can use the advantages of rectangular or elliptical shafts and use their cross sectional areas.
According of raises and shafts are listed below:
- Hydro-electric projects
- Surge Chamber
- Ventilation shaft
- Elevator shaft
- Pressure shaft
- Cable shaft
- Access or service shaft
- Supply riser
- Uptake or down-take shaft
Waste water shafts
- Drop shafts
- Tunnel projects
- Accelerators housing
- The open rising technique is used in driving short raises which are less than 10 meters.
- Compartment method
Rising by mechanical climbers
Blast whole techniques
- Long hole raising
- Drop rising
“Drop rising” technique is the advanced version of the “long hole raising” technique. This technique is based on the vertical carter retreat (VCR) concept. The crater has five holes, one of the holes is at the centre and the other four are at the corners. In these method (DTH) drills, drill parallel holes in the raise direction. After that holes are blasted in stages. Raises of longer lengths, up to 150 m, can be drilled using this method.
Raising by application of raise borers
This technique can be used to drive a raise between 2 levels in the ground. Using this technique, Raises have been drilled successfully even in poor ground where the soil condition is not very good. A circular shape is obtained from this technique. In this technique, the machine is set up at the top and drills a hole of 225 to 250 mm diameter, to get to the lower level. After that a large reamer bit is put on at the bottom of the drill rod and then it reams up the raise.
We can execute the reverse procedure by the machine; however, this option is not very popular.
Raise borers can drive in soft ground and hard ground, and such units are useful to drive raises and shafts up to 6 m diameter, This method has the advantages like, faster rates, better safety for working crews and least disturbance to the rock structure. By using this method the holes by the following properties is driven before: Shaft length; 1000 m, Diameter .6 to 6 m Shaft sinking .
Applications of Shafts
Shafts are usually used for the following purposes:
- Mining mineral deposits
- Temporary storage and treatment of sewage
- Bridge and other deep foundations
- Hydraulic lift pits
- In conjunction with a tunnelling system or network, for the purpose of lifts, escalators, stair and ladder ways,, ventilation, conveyance of liquid, carrying pipes and cable in river crossing, drainage and pumping, particularly from sub aqueous tunnels.”
- They also can be temporary or permanent,
Activities required for Shaft Sinking
We can divide the operations for sinking a shaft into three parts:
- Reaching up to the rock head
- Sinking through the rock
- Sinking through the abnormal difficult ground, if any, using special methods
A sinking cycle includes the following operations:
- Mucking and hoisting
- Support or shaft lining
- Auxiliary operations
- Dewatering O Ventilation
- Lightning or illumination
- Shaft centering
We use sinkers to drill holes of 32-38 mm diameter, the length of the holes vary between 1.5 to 5 meters.
There are three types of cuts
- Wedge cut
- Step cut
- Pyramid cut
1 and 2 are common drilling that are used and in rectangular shafts. Wedge cut is used most of the time. Pyramid cut is often used in the circular ones. Step cut is adopted if water is high and the shaft is of a large cross section.
In practice, at the bottom of shaft is usually full of water during sinking.
Therefore, high density, water-resistant explosives are used.
Lashing and mucking
Lashing is made for the loading of muck into a conveyance for itsdisposal. This activity is a time consuming activity due to Presence of water, limited space.
Support or shaft lining
There are two types of lining,
The type of water and strength of the rock and soil layer where sinking operation is done determine which option to select. Therefore, in some cases, temporary support is not adopted, while in others it becomes essential to protect the crew and equipment from any side fall. The permanent lining can be made of bricks, concrete blocks, monolithic concrete, shot Crete and cast iron tubing.
- Dewatering: When the shaft is reached to the water table or beyond it, water inflows inside it, to remove this water usually face or sinking pumps are used. Removing water can also be done by driving deep wells or well point systems around the shaft that results in lowering the water table around the shaft.
- Ventilation: Fresh air, supplied by a forcing fan installed at the surface, which can be provided by rigid ventilation ducts for below m depth or flexible ones for more than 6 m depth.
- Illumination: A pneumatically operated light is used to provide illumination at the working face during construction work.
- Shaft centring: Using the reference points, which are fixed before, to fix the shaft center. The shaft center is checked from time to time by the use of centering device installed at the surface.
Special methods for shaft sinking
In the process of shaft sinking, it becomes necessary to adopt a special method if the ground through which the shaft is sunk is loose or unstable such as in sand, mud, gravel, or alluvium, or when an excessive amount of water is encountered, which cannot be dealt with by sinking pumps. In some situations, both sets of these conditions may be encountered.
Listed below are special methods that can be used to deal with the situations outlined above:
- Piling system
- Freezing method
1. Piling system (Soldier pile):
These piles are driven and after installing the steel beams can be concreted. Piling method and the spaces between piles depend on the soil conditions.
2. Freezing method
“Sometimes when we can’t control the groundwater by pumping, we may use freezing or grouting. This procedure consists of sinking pipes around the area to be excavated and circulating a cold brine solution through the pipes, thereby freezing a wall of soil, this process needs 2 months to complete,” .
In this method we drill rows of grout holes around the shaft perimeter, then inject grout into them, but freezing is more reliable comparing to this
Shotcrete is sprayed concrete can be applied immediately to freshly excavated rock Impact on surrounding infrastructures
Shaft sinking can have the following impacts on the infrastructure and environment around it:
- king the streets and causing traffic in the area around it
- making noise and dust which can bother the people around the construction area
- bad effects on soil because of making vibrations in the ground while construction
- cutting some trees and clearing the area for construction site
Aropriate soil conditions
appropriate soil condition for each method is mentioned during the construction method, and if the soil is not strong, we should use piles and temporary linings to take care of that The space between columns depends on the soil conditions and amount of ground water existing, piles can be close to each other or have the appropriate distance. owever, strong and onsolidated soil is the most appropriate soil for driving shafts.
struction site layout and its benefits as below:
entifying the facilities that are temporary needed to support construction operation on a project but that do not form a art of the furnished structure: determining the size and shape of these facilities; positioning them within the boundaries of the vailable on-site or remote areas”
e so called temporary facilities usually remain on site for a period ranging from a few days to several months or even years, a time period that ranges from duration of a construction activity to the duration of a major phase of the entire construction period”.