This standard specifies the main contents of construction planning ofunderground works of hydropower and water conservancy projects aswell as the design guide for construction of different parts.This standard is applicable to the design of construction pl...[继续阅读]

    11.3.1 For trackless transportation, loaders or excavators matchingwith dump trucks should be applied.11.3.2 The width of mucking channel shall be determinedaccording to the type of equipment and vehicles adopted. Whenexcavating circular tunnels by full f...[继续阅读]

    7.1.1 Cyclic footage shall be determined based on tunnelsurrounding rock classification, section dimensions and performanceof drilling or mucking equipment.7.1.2 Controlled blasting shall be required for each tunnel orcavern excavation. The number of dril...[继续阅读]

    4.0.1 Design information(1) Pre-feasibility study report and its review comments.(2) River flow control planning and relevant requirements on floodcontrol.(3) Hydrological and meteorological characteristics and naturalconditions such as topography and geo...[继续阅读]

    7.6.1 The rock-plug blasting method may be applied forconstruction of deep water inlet.7.6.2 The selected location of rock plug shall comply with thelayout of hydraulic structures, and have good blasting conditions. It isrequired that the surrounding rock...[继续阅读]

    13.0.1 For concrete lining of underground tunnels, full face placingor partial placing shall be adopted for long tunnels with circularsections; for tunnels with square or circular sections, the crown andsidewall concrete should be placed at the same time;...[继续阅读]

    7.2.1 When excavating from the top down, full face tunnelingmethod shall be preferred, rail-mounted drilling, loading and muckingequipment shall be used.7.2.2 When the slope is not steeper than 30°, tramcar should beused for mucking in the top down excava...[继续阅读]

    12.0.1 Penstocks installation may be conducted after thecompletion of tunnel (shaft) excavation and support works.12.0.2 The transportation channels for penstocks should beselected as the followings.(1) The penstocks shall be transported to the lower hori...[继续阅读]

    11.1.1 The mucking machineries for loading, traction andtransporting shall be matched. When condition permits, equipmentwith higher loading and carrying capacity shall be adopted.11.1.2 The speed and spacing of vehicles shall meet safetyrequirements.11.1....[继续阅读]

    9.0.1 The support of underground works during construction shallinclude the portions outside the tunnel portal affecting safeconstruction.9.0.2 Before the commencement of excavation of tunnel, theexcavated slope at the tunnel portal and the hillside above...[继续阅读]