How Much Does Rock Excavation Cost?
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Rock excavation refers to the digging of hole in pure rock, removal of the pieces of rock, and disposal of the hard and firm parts of the earth’s crust. It is done primarily for the purpose of making solid foundations for structures, such as skyscrapers, dams, and some houses. It may also refer to the removal of undesirable rocks from a certain area.
Rock excavation is not a new practice at all. In fact, it has been used in the construction industry since the invention and widespread use of dynamite in the 19th century. Through this type of digging, many tunnels and subways have been created for man’s convenience.
How much does it cost?
- Depending on the type of rock, the size of the job, placement, contractor rates, geographical location and other factors, most rock excavation jobs are going to be around $5-$35 per cubic yard if a blasting method is used. If another process other than a blasting method is used, the costs per cubic yard can more than double.
- Based on the discussion at eng-tips.com, the average cost of rock excavation is around $5 to $15 per cubic yard if the contractor is able to drill and complete the blast.
- Louisvilleky.gov received bids from five different contractors, whose rock excavation services were priced anywhere from $60 per cubic yard by blasting, to as much as $125 per cubic yard by mechanical means.
What is going to be included?
- When rock excavation takes place, the first thing that will be done is surveying of the land. Measurements will be taken of the area to be excavated to ensure that the correct amount and area is dug out. Once the plans have been made, one of the many processes of rock excavation will be used to loosen the rock. Once this is done, the rock will be excavated, loaded into a truck, and disposed of.
- Disposal of the excavated rock usually includes using that rock for other things such as landscaping, construction, etc.
What are the extra costs?
- Generally, jobs that require a survey, mat and an extensive setup can double or even triple the costs mentioned above. This usually happens when buildings or obstacles are nearby.
- You should set aside a certain amount of emergency fund to anticipate unforeseen expenses.
- An inspector fee might be paid separately.
- The more laborers or workers who participate in the project, the more you will end up having to pay.
- Expect to pay more for rush projects.
Factors that influence the price:
- Contractors charge different rates for their services. Also, the size of the project is taken into consideration in the pricing.
- The geographical location of the project also matters in the pricing scheme.
- The process that is used for the rock excavation (see below) will help determine the price of the project.
Processes of Rock Excavation:
- Blasting. During the blasting process, the contractor usually executes an instrumented seismographic monitoring on the ground motion particle velocity and rate of the blast. The engineer of the project will be given a copy of this daily seismographic chart. Blasting can be done in many different ways and can use different materials to use complete the job. The most common procedure for blasting is to drill a hole into the ground, insert dynamite or other explosive into the hole, and detonating the explosive.
- Hammering. Hammering, also referred to as breaking, is when a jackhammer is used to break up the rocks. This is usually done on small projects around the home. A hydraulic hammer can also be attached to the arm of an excavator to perform the procedure on large projects.
- Trenching. A trench is a rock excavation that is used to insert pipes or other things below the surface. This is usually used when building homes or roads.
- Ripping. Rock excavation done by ripping is simply breaking apart the earth using an arm with teeth usually connected to the back of a bulldozer.
Tips to know:
- The purpose for inspecting the blast site is to check and record any visibly recognizable pre-existing defects or damages in the structures. As a matter of procedure, a waiver of inspection is made in writing and signed by the structure owner(s) or his representative who takes control over the structures.
- Make sure that you research all the types of rock excavation and determine which one is best suited for your situation. Get the opinion of at least two companies before making a decision.
How can I save money?
- Get several bids from different contractors and compare their rates. Decide on one that can deliver your project into completion at the most cost-effective manner. Be sure to investigate on the track records of the different contractors from whom you ask for estimate. If you do not know where to get multiple bids, consider getting quotes from free comparison services such as HomeAdvisor.com.
- Some small projects can be do it yourself by renting a small piece of equipment.
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