Prolonged life

　In December 2022, Yokohama City formulated the "Comprehensive Management Plan for Public Facilities in Yokohama" as a basic policy for promoting planned and effective conservation and renewal of public buildings with a view to the future. In line with this plan, we are implementing measures to ensure the safety of facilities and extend the service life.
　Based on this plan, the Public Building Life Extension Measures Project is based on this plan, with citizen-use facilities and government buildings under the jurisdiction of the ward bureau, which is not in charge of repair, as `` facilities subject to longer life, '' We are working to extend the life of facilities by implementing effective and effective conservation.

　In the project to extend the life of public buildings, we are promoting the Prevention conservation, which takes measures before defects occur.
　The following figure shows the concept of "State Monitoring conservation" and "Time Planning conservation".
　First of all, "Time Plan conservation" is a method of preventive maintenance based on the recommended cycle of manufacturers. In this case, even if the deterioration has not progressed so much, repairs will be carried out according to the recommended cycle, which is not efficient.
　On the other hand, the “State Monitoring conservation” is one of the preventive conservation methods that determine the timing of repairs based on the results of various inspections, including deterioration surveys and legal inspections by qualified personnel, and daily inspections by facility managers. In addition to ensuring the safety of the facilities by improving inspections, we will use them for as long as possible to reduce the number of repairs required and reduce the life cycle cost of conservation.

　The conservation is implemented after prioritizing the impact of the failure on the safety and operation of facilities, based on the fact that rooftop waterproofing, exterior walls, and equipment failures on the safety and operation of facilities.
　In addition, if there are plans for rebuilding or restructuring, the timing of the implementation of the conservation will be determined based on the plans.
　Specifically, based on the deterioration survey, we will grasp the effects of deterioration of each part, such as (1) those related to legal compliance, (2) those related to the safety of citizens, (3) those that greatly impair the life of facilities, and (4) those that have a significant impact on the operation of facilitiesconservation.
　In terms of the nature of the part, `` (1) related to legal compliance '' means that if it breaks down due to deterioration, if it is left unattended, it will be a violation of laws and regulations, such as automatic fire alarms, etc., for which safe management is stipulated by laws and regulations Update of disaster prevention equipment is applicable.
　"2 Those related to the safety of citizens" refers to accidents caused by deterioration of members and related to the safety of citizens. For example, fall of outer wall tiles and breakdown of elevators (elevators) .
　"3 Those that greatly impair the life of the facility" refers to components that affect the life of the facility due to deterioration, such as water leakage from the water protection layer on the roof, and the rebar rusts and cracks in concrete. This is the case that leads to a shorter life of the facility.
　"4 Those that have a significant impact on the operation of facilities" refers to the renewal of lighting equipment and air conditioning equipment that affect the operation of the facilities.

　Regarding the panel foundation to be installed on the upper part of the water surface on the rooftop, the concept of the panel foundation was organized so that it could respond to future waterproofing repairs, etc., and in January 2025, we requested the relevant departments of the facilities targeted for longer life to respond. I am. The outline is as follows.

　Adoption of foundation materials for solar panels that have little impact on the water-resistant layer

1. When installing solar panels on the rooftop for the first time, install the existing waterproof layer as little as possible to prevent the occurrence of rain leaks. When installing, if it is necessary to cut out the existing waterproof layer, etc., it is also necessary to repair patches.
2. If rooftop waterproofing repair work is required due to a leak during the solar panel installation period, it is easy to remove and reinstall the solar panel without damaging the existing waterproof layer and the new waterproof layer. It is necessary to do it.
3. In the event that waterproofing renovation work is carried out integrally, including the foundation members of the solar panel, in order to prevent damage to the water protection layer due to the removal of the foundation members, in principle, the foundation members can be left in the facility at the end of the PPA project. Make advance adjustments with the company.
4. When installing solar panels on the rooftop surface, we will adopt products that have little effect on the water protection layer, such as adopting dry foundations that can be waterproofed while retaining some of the foundation members. Make sure that appropriate foundation installation is performed by the company. (Reference: Reference Materials)