Sadao Kimura

The Relationship between Damages in Road Pavement and Customer Feedback

Throughout Japan the road surface condition of expressways is monitored on regular basis. IRI is used as a measure of road roughness and visual inspection by expressway patrol teams is used to check for emergency road damages. Inspection using IRI is carried out every two years. When emergency road damages, such as potholes, are detected by expressway patrol teams, emergency repairs are executed as soon as possible.In addition to IRI and visual surface inspection, some customers lodge complaints about the trafficability of the expressways. In this study, damage probability of road pavement was evaluated using inspection result data between each interchange along an expressway. The relationship between damage probability and customer feedback for trafficability was also considered. Life-Cycle of Engineering Systems: Emphasis on Sustainable Civil Infrastructure – Bakker, Frangopol & van Breugel (Eds)

A STUDY ON PRODUCTION EFFICIENCY OF SHIELD TUNNEL SEGMENT USING SELF-COMPACTING CONCRETE

The segments for shield tunnel made of self-compacting concrete (SCC), which product system is established under conditions of once a day, are already supplied to shield tunnels. On the other hand, it is popular that segment is made of stiff consistency concrete (2cm of slump) using form twice a day. Properties of SCC omit to vibrate for concrete placing and finish work for surface of segment. So that, manufacturing process and cost are reduced, it is necessary to improve curing condition in order to increase production efficiency. This paper shows a possibility to realize that segment is made of SCC under conditions of use form twice a day.

MATERIAL AND MECHANICAL CHARACTERISTICS OF THE FRP-KEY JOINT FOR SHIELD TUNNEL SEGMENTS

首都圏の基幹地中送電線用洞道は, 近年トンネル位置の深層化に伴って硬質な地盤での施工が多くなっている. この自立性の高い地盤を対象にセグメントの新型継手として, セグメント継手面とリング継手面の双方に凸形をしたFRPを埋め込み, 一方, コンクリートには凹部を設けてこれと嵌合させる構造 (FRP-Key 継手) を研究開発した. このFRP-Key 継手は, せん断力の十分な伝達機能を確保するとともに, セグメント組立時の調芯機能を有しているため, 現場でのセグメント組立時間の短縮が期待できる. またFRP-Key 継手の部材は型枠に設置してセグメント本体と一体成形できることから型枠製作費も抑制できる. 本論文はFRPの材料特性や各種継手試験に基づいたFRP-Key 継手の力学特性およびその継手の設計法について述べたものである.

PREDICTIVE ANALYSIS TO EVALUATE BEHAVIOR OF CLOSELY CONSTRUCTED PARALLEL SHIELD TUNNELS.

Presented is an analytical method to predict the behavior of the lining of the existing tunnel when a new tunnel is constructed parallel and close to it. In the analysis, driving forces in the longitudinal and the lateral direction and the change of the earth pressure due to the construction of the new tunnel are evaluated separately. The behavior of the lining of the existing tunnel is computed and compared with the result of the measurement. The analysis shows good agreement with the measurement, hence the proposed method is effective for the design of the construction of closed parallel shield tunnels. K eywords: parallel shield tunnels, closed construction, pseudo-three dimensional analysis of segment rings