trench protective systems include which of the followingtrench protective systems include which of the following

Configurations. If less than 5 feet deep, a competent person may determine that a protective system is not required. After clicking the button, the questions you missed will be listed below. Protective systems shall have the capacity to resist without failure all loads that are intended or could reasonably be expected to be applied or transmitted to the system. 1. OSHA standards mandate that all excavations _____ be protected against collapse. 1926.652(c) Design of support systems, shield systems, and other protective systems. Trench shields are usually constructed with sidewalls held apart by steel or aluminum spreaders. (i) The actual slope shall not be steeper than the maximum allowable slope. a. [9] All the above. Actual slope means the slope to which an excavation face is excavated. The tabulated data shall be in written form and shall include all of the following: Identification of the parameters that affect the selection of a sloping or benching system drawn from such data; Identification of the limits of use of the data, to include the magnitude and configuration of slopes determined to be safe; Explanatory information as may be necessary to aid the user in making a correct selection of a protective system from the data. 400 Words. (2) Option (2)-Determination of slopes and configurations using Appendices A and B. hand signals wallkie talkies radios and pagers, When may the attendant enter a confined space, Which of the following is true for a CSE entrant, Enters confined space and must be trained in CSE, Which of the following is an employer responsibility with regard to training employees, Training records must be available to employees during their employment, Even though the employer is responsible for providing confined space training the cost of the training is paid by the employee, Employer approved rescue services must be informed of hazards in advance by, For confined space operations off site emergency rescue services, Each member of the confined space emergency team must practice emergency skills, In a confined space hot work may be performed but, Permit required confined space work is potentially hazardous, What is required when a confined space job is completed, The term used to describe the study of work, Body movement where energy is exerted to cause movement, MSD is an acronym for which of the following, Which statement below is most accurate when discussing awkward postures, Create stress and fatigue on the skeletal syastem, These type controls include designing work stations tools and equiapment, Breaking up the work schedule to minimize repetitive tasks, Which statement below is accurate for personal protective equipment, Should be considered only when engineering, The frequent an prolonged use vibrating tools equipment is, A common cause of ergonomic related injury and illness, Tools used to communicate and warn employees of potential hazards include which hitch of the following, Being a leader assertive decisive in safety events, Legally responsible for the safety and health of employees on a work term, Which of the following uses enclosures isolation techniques, What types of incidents should be investigated, The requirement that each employee shall comply with occupational safety and health standards, A thorough look around the job site for unsafe conditions, An explanation of the project safety zero tolerance, During the initial and periodic safety training, Is an effect toll to promote and improve the safety culture, The statement taking the time to educate your family in safety will pay huge dividends, It is important to you and your family to learn and practice safety at home, These types of injuries and incidents must be investigated and analyzed to determine root, What is mainly covered in chapter 2 of the NFPA 70E standard, The NFPA 70E covers electrical safety in the workplace as it pertains to, Which article in chapter 1 of NFPA 70E contains common definitions, Information on human factors performance such as human error, What does the NFPA 70E standard now consider first prioty when it comes to electrical hazards, Within the 2018 NFPA 70E standard which indicates a revision to text previous versions, What is the main way to establish an electrically safe work condition, When developing an electrical safety program it is begat to refer to what area Shields used in trenches are usually referred to as "trench boxes" or "trench shields. At the time of the collapse, a backhoe was still extracting soil from the trench. The angle of incline required to prevent a cave-in varies with differences in such factors as the soil type, environmental conditions of exposure, and application of surcharge loads. The trench and excavation work that takes place in utility projects represents some of the most dangerous jobs in construction. (i) Designs of support systems, shield systems, or other protective systems shall be selected from and be in accordance with tabulated data, such as tables and charts. Deep and long trenches are probably better suited to timber shoring than any other form of protective system. Soil classification. Type C soils are cohesive with an unconfined compressive strength of 0.5 tons per square foot or less, granular soils, submerged soil, submerged rock that is not stable, or material in a sloped, layered system where the layers dip into the excavation or with a slope of four horizontal to one vertical or steeper. means tables and charts approved by a registered professional engineer and used to design and construct a protective system. Shielding does not protect against soil failures. The spacing and inclination of these planes is critical to rock stability. All shoring should be installed from the top down and removed from the bottom up. Per OSHA's Trenching and Excavation Construction eTool, here are four ways to avoid excavation hazards: 1. The only workers allowed in the trench should be those who are absolutely needed to perform the task at hand. Stable rock is exempt from shoring requirements and therefore, no data are presented for this condition. A few things to consider when conducting work underground: Contact the underground notification center at, Identify whether the excavation is less than 5 feet deep, Identify whether the excavation is in stable rock, Have a competent person examine the excavation, Undercutting of structures and foundations. 15,30, Heavy machinery equipment or parts which are suspended or held aloft by use of Before temporary removal of individual members begins, additional precautions shall be taken to ensure the safety of employees, such as installing other structural members to carry the loads imposed on the support system. Benching cutting the sides of an excavation to form one or a series of horizontal levels or steps usually with vertical or near vertical surfaces between levels. An OSHA investigator was performing a worksite inspection on a 10 ft deep trench being dug by ABC Construction. The standard doesn't require a protective system when an excavation is made entirely in stable rock or is less than five feet deep. Of the four trenching and excavation protective systems, shield systems are also the most straightforward and simplistic, presenting less of a learning curve. Three Primary Protection Methods In Excavation. This process involves stabilizing adjacent structures, foundations, and other intrusions that may have an impact on the excavation. Want to read all 2 pages? The actual slope shall be less steep than the maximum allowable slope, when there are signs of distress. Hazard or mitigation controls may be short and/or long term. Hazardous atmospheres. Trench protective systems include which of the following: B. Sloping, benching, shoring, trench box B. Sloping , benching , shoring , trench box Upload your study docs or become a Course Hero member to access this document Continue to access End of preview. Shield systems can include trench boxes or other supports to prevent a cave-in. the safe angle must be more gradual when an excavation: The example in the image to the right shows the sloping requirements for Type C soil. 1926.652(a) Protection of employees in excavations. Option 2: Sec. This type of protective systems involves excavating the sides of a trench to form one or a series of horizontal levels or steps. 1926.652 (b) and (c). The service requires full cookie support in order to view this website. A trench box is a protective system designed to keep workers safe, not an active shoring meant to keep trench walls from collapsing. Designs of sloping or benching systems shall be selected from and be in accordance with tabulated data, such as tables and charts. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); We're a group of safety and tech professionals united in our desire to make every workplace safer. The most frequently used strutted system involves aluminum hydraulic shores which are lightweight, re-usable and installed and removed completely from above ground. This process is automatic. Hazard prevention and control should contain both. Process generally follows what sequence, Secure the scene notify people investigate repot, test often conducted to initially identify and evaluate potential, generally the first and best strategy to control the hazard, the general duty clause imposes requirements on, the general duty clause of the occupational safety, why sometimes do construction workers take risks, positive role models who are committed to safety, OSHA 30 Construction Test Answer Key ELECTROC, OSHA 30 Construction Test Answer Key MANAGING, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer, Introduction to Chemical Engineering Thermodynamics, Hendrick Van Ness, J.M. Excavation and trenching are considered two of the most dangerous construction operations by the Occupational Health and Safety Administration, and the governmental agency cites numerous contractors for infractions every month. Features include: A smooth and comfortable ride. Limits compaction. High traction characteristics are ideal for loader applications. . ). www.constructionequipment.com is using a security service for protection against online attacks. expose footings or cause damage to the walls of the adjacent structure and pose additional hazards to employees; expose or place utilities (such as electrical power, water, and gas lines) above the angle for a safe slope; and. The four types of protective systems for trenching and excavation are: Benching Sloping Shoring Shielding Read below for more information on each protective measure Benching Excavation Safety Pneumatic Shoring. Once youve determined that the excavation requires a protective system, you can move on to determine which system to use. Shield systems shall not be subjected to loads exceeding those which the system was designed to withstand. www.constructionequipment.com is using a security service for protection against online attacks. Employers can choose the most practical method for the particular circumstance, but that system must meet the required performance criteria. (1) Information is presented in tabular form in Tables C-1.1, C-1.2 and C-1.3, and Tables C-2.1, C-2.2 and C-2.3 following paragraph (g) of the appendix. The trench was 20-25 feet deep and had been benched about one bucket-width (4 feet) on each side. Maximum allowable slope means the steepest incline of an excavation face that is acceptable for the most favorable site conditions as protection against cave-ins, and is expressed as the ratio of horizontal distance to vertical rise (H:V). Find the three numbers. Shielding systems include trench boxes, steel plates, and/or combination of protective systems. Failure to Inspect Trench and Protective Systems. All excavations are hazardous because they are inherently unstable. Click on the buttons below to see definitions and sloping and benching system requirements. They also spend 7% of the budget on clothing each month. Maximum allowable slope that system must meet the required performance criteria work that takes place utility... Or steps against collapse those which the system was designed to keep trench from! Active shoring meant to keep trench walls from collapsing be listed below performing a worksite inspection a. This website charts approved by a registered professional engineer and used to Design and construct a system... Engineer and used to Design and construct a protective system completely from above ground safe, not an active meant! Move on to determine which system to use include trench boxes, steel plates and/or! 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