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基幹路網整備を加速化させる一方策として，既設路網の高規格化が挙げられるが，高規格化の物理的・経済的な難易は，既設路網の立地と構造の条件によって異なるため，既設路網の高規格化により基幹路網がどの程度整備可能であるかは明らかでない。そこで本研究では，既設路網の高規格化による基幹路網の整備の可能性を，拡幅の観点から明らかにすることを目的とした。長野県伊那市の民有林に整備された作業道，2・3 級林道を対象に，既設路網の全幅員を3.5 m および4.0 m に拡幅するシミュレーションにより，路線ごとに拡幅の物理的可否の判定と拡幅単価の試算を行った。その結果，設定条件下で拡幅可能と判定された路線の総延長が既設低規格路網の総延長に占める割合は，全幅員3.5 m への拡幅の場合は89.0% であり，全幅員4.0 m への拡幅の場合は70.1% であった。路線長の重み付きの平均拡幅単価は全幅員3.5 m への拡幅の場合は1,787 円/m であり，全幅員4.0 m への拡幅の場合は5,537 円/m であった。仮に対象地において，全幅員3.5 m へ拡幅可能なすべての既設路網を拡幅した場合，基幹路網の目標整備水準の達成に必要な整備量の36% を拡幅により賄える可能性が示された。, Upgrading of existing forest roads is a way of accelerating development of high-graded forest roads. However, the difficulty of upgrading in terms of physicality and economic efficiency differs by conditions of location and structure of existing forest roads. Therefore, it is unclear how amount of development of high-graded forest roads could be achieved by upgrading. The purpose of this study is to clarify the possibility of development of high graded forest roads by upgrading existing forest roads by use of widening simulation. The simulation was performed for forest roads located in private forest of Ina city in Nagano prefecture, and the physical availability and unit cost of widening was resulted. As a result, the ratio of the total length of routes judged to be expandable under the set conditions to the total length of the existing low-standard road network was 89.0% in the case of the expansion to 3.5 m in full width and 70.1% in the case of the expansion to 4.0 m in full width. Average widening unit cost weighted road length is 1,787yen/m in case of widening to 3.5 m full width and 5,537yen/m in case of widening to 4.0 m full width. When all existing forest roads that able to widen to 3.5 m full width on study site, it is revealed that 36% of development amount needed to achieve objective development amount are covered by widening.

はじめに（⽵内潔） ........................................................................................... 11. 地域の概要 ..................................................................................................... 32. 曳⼭祭2-1. 曳⼭祭の概要（⼩⼭彩恵）....................................................................... 132-2. 曳⼭祭を⽀える⼈々（⼩⼭彩恵） ............................................................ 253. 地域コミュニティにおける祭りの役割（⼩坂ゆう⾹） ............................... 41―野下町獅⼦舞の事例から―4. むぎや祭4-1. むぎや祭の概要（寺⽥未佳・羽⿃良⻫） ................................................. 594-2. むぎや祭をとおして変化するコミュニティ（寺⽥美佳） ........................ 634-3. むぎや祭が持つ楽しさと束縛（羽⿃良⻫）.............................................. 794-4. むぎや祭における「じゃんとこいむぎや」の役割（霜⿃祐希） ............. 935. 婦⼈会が地域に果たす役割（藤村沙樹） .................................................. 1116. 神社・伝説・祭りから⾒る⼈々の「郷土観」（吉浦翔） ........................... 1297. 城端の⾷⽂化におけるナレズシ（⽊⼭侑希） ........................................... 1418. 農村部と町部の家屋構造と居住者の認識（⽯附かおり） ......................... 1519. 国道の拡幅と再開発による住⺠⽣活の変化と住⺠の城端像（河合智⾹） 16510. ⽣活施設に関する意識調査から⾒る城端のイメージ（⽥村駿裕） ......... 17711. 絹織物に対する住⺠の意識と⽣産者の取り組み（近藤奏絵） ................ 18512. 理休地区における⽔⾞と住⺠の関係（佐野あずさ）............................... 195

In order to improve the aeroelastic stability, there is a prestressed concrete stress ribbon footbridge, which was widened at the end of the span. The serviceability of the lateral vibration of the widened bridge is not clear. Therefore this study investigates the serviceability for the lateral vibration of the PC stress ribbon footbridges due to widening at the end of the span. This study made widened stress ribbon footbridge analytical models with various widths and span lengths using finite element method. Additionally, eigen-value analysis was carried out to grasp the vibration characteristics of those bridges. The vibration serviceability subjected to pedestrians walking on those bridges was simulated using the Hivoss guidelines method.