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Questionnaire - Trench Box and Trenching Operations
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- Approximately how many workers does your firm normally employ?
20
- How are the company revenues distributed?
15% sewer |
5% water |
20% gas |
10% telephone |
40% electric |
10% telecommunications |
0% Others: |
- Approximately how many linear feet of sewer pipe did your firm install this past year?
500 feet
- Approximately how many different projects are undertaken by the firm each year?
15
- What is the approximate total number of feet of trench dug each year?
3000 feet
- What percent of the trenches are deeper than 5 feet?
10 %
- What types of worker protection are provided in trenches that are at least 5 feet deep?
30 % Sloped
30 % Trench Box
30 % Shoring
- How many trench boxes does the firm own?
5
How many of these trench boxes were purchased (not made in your shop)?
50 %
- Are trench boxes stacked on top of each other in some trenching operations?
yes
If yes, on how many projects were trench boxes stacked this past year?
- In the use of trench boxes, how often have the following practices been reported or observed on your projects in the past year? (indicate the number reported or observed)
5 workers venturing out of trench box into the unprotected portion of the trench
3 using a trench box without a bulkhead
5 using trench boxes without ladders
2 setting trench boxes too deep where materials could fall in from the top
1 setting trench boxes more than 2 feet above the trench bottom
7 workers not staying clear of materials being lowered in the trench box
4 operators getting dangerously close to overhead power lines
- How many trench box related injuries has the firm had in the past five years?
1
When exiting the trench box, how often are the following methods used?
10 % workers exit the back of the trench box and walk up the bankfill
0 % workers use a ladder that is inside the trench box to exit
0 % other (please describe):
- Who is the competent person in your company executing trenching operations?
40% Foreman |
10% Safety Officer |
30% Superintendent |
20% Crew worker |
% Other (If other, please explain)
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- What types of worker protection are provided in trenches when utility lines are present in the trench?
20% Sloping |
30% Benching |
20% Shoring |
20% Trench Box |
10% Other (If other, please explain)
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- Which of the following practices are implemented in your company to improve safety?
Incentives programs |
Yes
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Daily safety meetings |
Yes
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Pre construction meetings |
Yes
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Specific training (trenching) |
Yes
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If yes, please specify the number of training sessions every year:
4
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- What are the main causes of trenching related accidents? Please rank in order of frequency (0= least frequent, 10 = most frequent)
3Lack of workers' training |
4Lack of planning |
1Inadequate equipment |
5Lack of supervision |
7Workers inexperience |
2Weather conditions |
10Unforeseen soil conditions |
8Undefined construction specifications |
9Spoil/equipment near the trench |
6Incomprehensive regulations |
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