Estudio del perfil del socio actual de la Cámara de Comercio de Ambato

Design and construction of Busway Stations, Light Rail Stations and Ancillary Structures shall be in accordance with the draft Specification MRTS99 Bus Station, Light Rail Station and Associated Buildings. MRTS99 will be eventually superseded by MRTS300 (series) (In development,).

14.3.1 Column base plate details

The detailing of column footings are required to satisfy durability and safety in design considerations. Steel posts shall not extend below ground level because corrosion will occur. For durability reasons, the steel post/column shall end with a base plate above ground.

Chapter 14: Busway stations, light rail stations and ancillary structures

Safety in design considerations mean that anchor bolts at ground level may be a tripping hazard. For example, this hazard may be overcome by ornamental screens to stop people tripping or placing on a raised plinth.

Base plates shall be constructed above ground/finished floor level. Base plates shall be left open without embedment into concrete or other material.

14.3.2 Corrosion protection for structural steelworks 14.3.2.1 General

All structural steelworks shall be hot dip galvanised to AS 4680. Galvanising surfaces may be painted to colours shown in the architectural drawings. Such paint systems shall be compatible and adhesive on to the galvanising surface. Paint systems shall be applied in accordance with the Transport and Main Roads standard specification MRTS88.

Refer section 3.8.1 for additional requirements for galvanising on steel with low silicon and low phosphorous contents. Following additional requirements shall be met in galvanising of steel works.

• Connections shall be sealed on all faces to stop the ingress of water and galvanising acids which causes corrosion at interfaces. Where access for welding is available to one side of a joint only, a full penetration butt weld shall be used.

• Where backing bars/backing rings are used inside members, the backing bars/backing rings shall be removed prior to galvanising. If they are not removed, acid is trapped between the backing bars/rings and the member resulting in crevice corrosion.

• The size of the components shall be checked to ensure that they can be hot-dipped galvanised after fabrication. Double dipping shall be allowed.

14.3.2.2 Substitute for hot dip galvanising

Where hot dip galvanising is not possible due to a reason such as limitation of the galvanising bath sizes, zinc metal paint system in accordance with MRTS85A shall be applied subject to prior approvals from Deputy Chief Engineer (Structures). Following additional requirements shall be met.

a) Any paint system specified must include details of how the coating shall be repainted in the future. The recoat system must be compatible with normal operating systems, for example:

• Abrasive blasting on site is difficult and undesirable

• The closure of some lanes for repainting is not possible on highly trafficked roads. Similar conditions shall apply to other transport corridors.

• All coatings shall be able to be applied by airless spray, brush, roller, and air. The first coating system shall be applied in the shop. Recoats would be field applications. b) Any painted steelwork (for example components in gantry or bridge) over a road, rail or

shopping corridor shall be provided with a maintenance gantry attached to the structure. The design of the maintenance gantry shall be such that when the maintenance gantry is in use, it will not intrude into the clearance envelope of all surrounding corridors.

Chapter 14: Busway stations, light rail stations and ancillary structures

14.4 Durability for concrete

The minimum exposure classification for the purpose of determining cover to reinforcement and the concrete mix shall be B2 to AS 5100 except exposure classification for components with design life of 50 years or less as specified in Clause 14.1 shall be to AS 3600. Minimum exposure classification for components of 50 years or less shall be A2 to AS 3600.

Chapter 15: Development application in the proximity to bridges and other structures including transport infrastructures

15 Development application in the proximity to bridges and other structures including transport infrastructures

Refer Section 9 for development application in the proximity to tunnels.

15.1 General

Transport and Main Roads is vested with the responsibility to inspect, maintain and operate state- controlled infrastructure. In order to undertake these duties, Transport and Main Roads must make the following provisions:

a) Provision must be made for duplication and widening of the road/transport infrastructure b) A corridor of 20 m wide or to the limit of the existing property boundary, whichever is lesser to

full length both sides along the infrastructure must be provided as a Transport and Main Roads road reserve.

15.2 Drawings, reports and method statements

The developer shall submit relevant items from the following list in the form of drawing or report for Transport and Main Roads review:

a) Structural drawings and architectural drawings of the new development showing minimum of but not limited to the following. RPEQ certified structural drawings shall be submitted before commencement of the construction.

• Extent of the development relative to the department’s assets

• Type of development

• General arrangement drawing and the cross section of the new structure

• Clear distance to the department’s structures from closest structural element of the new development

• Foundation details of the proposed structures including the type of foundation, founding levels and the geotechnical design loads such as applied bearing pressure under shallow foundations, pile design loads and so on

• Details of temporary anchors into and adjacent departmental properties including the location, anchor loads and so on

• Construction sequence

b) Imposed loads on the department’s structures due to constructions activities. c) Impact of development on departmental infrastructure

Developer shall submit a report explaining the impact of development on Transport and Main Roads infrastructure, if any. Minimum of following areas shall be described in this report.

• Demonstrate that the adequacy of the proposed retaining system to keep the effects of the excavation (and installation of anchors) within allowable limits.

• The sections of foundation of all the adjacent Transport and Main Roads structures (which are within the influence zone of the excavation work and the anchors) in relation to the retaining system (including the wall and anchors). The influence zone can be as much as two times the excavation depth in soft grounds.

Chapter 15: Development application in the proximity to bridges and other structures including transport infrastructures

• The predicted movements of the foundation and the surroundings.

• The effect of Negative Skin Friction (NSF) on pile foundation of the Transport and Main Roads structures. NSF due to dewatering and the excavation induced settlement could be expected on piles within the soft clay.

d) Excavation details including method statement, exclusion zones, machinery used and vibration issues.

e) RPEQ certified temporary works designs including shoring details, pile or anchor arrangements

f) Soil investigation reports and geotechnical design report including settlement calculations for proposed development and any possible influence on adjacent Transport and Main Roads structures.