Abstract of Special Research Report (SRR-91)
National Institute of Occupational Safety and Health, Japan
Study on Method of Dynamic Evaluation For Temporary Structures
Introduction
SRR-91-1 |
Kinichi KINOSHITA |
: In recent years, as major civil engineering works such as highway and bridge construction have increased drastically in Japan, the collapse accidents of such temporary structures as concrete shorings for bridge construction works have occured very often as mentioned in this report. Since these accidents may result in many casualties, the establishment of the preventive measures has become a great demand.
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Actual Measurement of Load Acting on Frame Type Shoring
SRR-91-2 |
Katsunori OGAWA, Yoshimasa KAWAJIRI and Kinichi KINOSHITA |
: On concrete works of bridges, many types of shoring have been widely used, such as the frame tpye, built-up post type and steel H type. On designing of these shorings, it is necessary to make clear the substitute forces and horizontal substituting forces. But the standards has not been clearly established present, and hence there are many cases in which the substitute forces aren't fully considered at design stage.
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Actual Measurement of Load Acting on Steel H Tyepe Shoring
SRR-91-3 |
Yoshimasa KAWAJIRI, Katsutoshi OHDO, Katsunori OGAWA and Kinichi KINOSHITA |
: On bridge constructions, frame type shorings and steel H type shorings have widely used for concrete placing. It is easy to calculate stresses of each member of the steel H type shoring because of the simplicity of the structure compared with the frame type shoring.
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Pulling-out Strength of Anchorbolts for Bracket
SRR-91-4 |
Katsunori OGAWA, Yoshimasa KAWAJIRI and Katsutoshi OHDO |
: The bracket is used for the supporting point of beam-type shoring in RC high bridge formation works. The anchor for this bracket-mounting application is embedded into bridge pier. This anchor plays an important role to support the brackets.
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Shear Strength of Anchors for Braket
SRR-91-5 |
Yoshimasa KAWAJIRI, Katsutoshi OHDO and Katsunori OGAWA |
: Brackets are widely used as support of beam-type shorings for concrete placing in bridge construction and are the most important members of the support system to prevent their collapse accident.
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Strength of Brackets for Temporary Beam
SRR-91-6 |
Yoshimasa KAWAJIRI, Katsutoshi OHDO and Katsunori OGAWA |
: Brackets are used as supports for beam-type shoring in concrete placing of bridge con struction, as shown schematically in Fig.1.
Then another calculating method is proposed and verified good agreement with measured values.
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On the Strength of Steel H Supported by Jack
SRR-91-7 |
Katsutoshi OHDO and Yoshimasa KAWAJIRI |
: On bridge constructions, mechanical jacks are used in steel H type shorings. Sometimes accidents due to collapse have happened in these shorings caused by buckling of steel H supported by jacks. Each strength of the jack and the steel H is cleared, but the strength of their compound structure is not cleared. |