CFB Construction Techniques 3 — Questions and Answers
Question 1: When trenching for a subsurface drainage system, what is a critical consideration for pipe installation?
- Pipes must be installed with perforations facing upward
- Trench width should equal exactly the pipe diameter
- Pipe bedding material must surround the pipe completely (Correct answer)
- Pipes should be installed without slope in flat terrain
Correct answer: Pipe bedding material must surround the pipe completely
Proper bedding material surrounding the drainage pipe prevents pipe crushing, maintains alignment, and allows water to enter perforated pipe from all sides.
Question 2: What is 'crown' in the context of natural grass field construction?
- The height of the turfgrass canopy above the soil surface
- The elevated center of a field that slopes away to promote drainage (Correct answer)
- The outer boundary or perimeter of the playing surface
- The uppermost layer of the root zone profile
Correct answer: The elevated center of a field that slopes away to promote drainage
Crown refers to the intentional high point at the center of a field that allows surface water to drain toward the sidelines.
Question 3: During grading operations, what instrument is most commonly used to verify field grades and elevations?
- GPS total station or laser level (Correct answer)
- Standard carpenter's level
- Tape measure and string line only
- Visual inspection by the contractor
Correct answer: GPS total station or laser level
GPS total stations and laser levels provide precise elevation measurements across large areas, ensuring the field meets design grade specifications.
Question 4: What is the correct method for installing sod to prevent seam gaps from forming as the sod dries?
- Butt pieces tightly together with staggered joints (Correct answer)
- Leave 1-inch gaps between pieces for expansion
- Install pieces in a straight grid pattern without offset
- Overlap edges by 2 inches to ensure coverage
Correct answer: Butt pieces tightly together with staggered joints
Sod pieces are butted tightly end-to-end with staggered brick-like joints to prevent gaps from forming when the sod dries and contracts.
Question 5: In synthetic turf field construction, what is the purpose of the shock pad layer?
- To provide a barrier against weed growth
- To attenuate impact forces and meet G-max safety standards (Correct answer)
- To improve drainage capacity through the system
- To anchor the turf backing to the base course
Correct answer: To attenuate impact forces and meet G-max safety standards
Shock pads are designed to reduce impact forces and ensure the field's Gmax (hardness) values stay within safe limits for player safety.
Question 6: Which condition most commonly leads to field rutting during construction?
- Excessive compaction of dry subgrade soils
- Heavy equipment operating on wet or saturated soils (Correct answer)
- Using vibratory compaction on granular materials
- Applying too many passes with a smooth drum roller
Correct answer: Heavy equipment operating on wet or saturated soils
Operating heavy construction equipment on wet or saturated soils causes rutting because saturated soil lacks shear strength to support loads.
Question 7: What is the function of a catch basin in a sports field drainage system?
- To store irrigation water for dry periods
- To collect surface water and convey it to the underground drainage network (Correct answer)
- To filter sediment from the irrigation supply line
- To regulate water pressure in the mainline
Correct answer: To collect surface water and convey it to the underground drainage network
Catch basins collect surface water that flows across the field and direct it into the underground pipe system for removal from the site.
CFB Construction Techniques 3
When trenching for a subsurface drainage system, what is a critical consideration for pipe installation?