| 摘要 |
<p>The invention relates to a method and installation for constructing an expressway, and to an expressway to be used as a duplicating road for existing urban or suburban motorways assigned for a heavy traffic. <??>The invention object consists in providing enhanced technological capabilities of a mobile installation by construction of an expressway in close quarters, without a decrease in traffic intensity; also consists in construction of an expressway erected above an existing trunk road, mainly along its longitudinal axis, in the course of construction of which expressway any hindrances to traffic on an existing road do not occur. <??>Said object is accomplished by providing a method for constructing an expressway in the form of an elevated road whose length extends at least partly above an existing motorway; which method comprises the steps of: implementation of a foundation portion of load-bearing supports, erection of the load-bearing supports on the foundation portion, placement of girders on the load-bearing supports and mounting of a span structure; erection of the load-bearing supports on the foundation portion being done when at least a portion of the technological equipment to be used for the works is arranged at the level of the upper load-bearing working surface of a gantry-type mobile installation, which installation is preferably self-propelled and consists, for example, of sections disposed in-series along its length; the mobile supports of said installation being disposed within the allocated land lot of an existing motorway; the girders being mounted on the load-bearing supports with at least one hoisting mechanism used as the technological equipment; said hoisting mechanism being preferably of the mobile crane type disposed at least on one section of the gantry-type mobile installation; height of clearance under said installation, in its operation position, being sufficient for allowing traffic on the existing motorway; at least a part of the technological operations for constructing the expressway being carried out such that traffic on the existing road may proceed. A portion of the technological equipment for constructing at least the foundation portion of the load-bearing supports being disposed at the existing motorway level. The elevated road longitudinal axis, at least along a portion of its length, is aligned along the longitudinal axis of the existing motorway or in parallel with the longitudinal axis of the existing motorway, or at an angle to the longitudinal axis of the existing motorway.</p> |
