4875 results about "Building construction" patented technology

The invention provides an underwater tunnel shield construction excavation face stability evaluation method, system and equipment, and the method comprises the steps: determining an excavation face stability evaluation index based on a shield construction excavation face instability mechanism; dividing the stability of the excavation surface into a plurality of grades, establishing each grade space, and determining the quantitative interval of each evaluation index in each grade; calculating a combined weight of each stability evaluation index by adopting a combined weighting method, and taking the combined weight as a judgment basis of the influence of the evaluation indexes on an evaluation result; and constructing an ideal point evaluation function by adopting an ideal point method so as to represent the membership degree of the to-be-evaluated object to each grade, calculating the grade membership degree of the to-be-evaluated section in each grade of the evaluation system, and determining the stability grade of the excavation surface in the construction process of the evaluation section.

The invention relates to an anti-ant large-core-number fiber ribbon cable comprising a cable core and an outer sheath. The cable core includes loose tubes; and fiber ribbons are sleeved inside the loose tubes. The outer sheath is an outer nylon sheath; and a non-metallic reinforcement layer is arranged between the outer sheath and the cable core. According to the anti-ant large-core-number fiber ribbon cable provided by the invention, with the outer nylon sheath, ants can not bite the sheath, so that the damages on the optical cable by ant biting in a pipe at an area with a serious anti problem are prevented, the normal state of the cable is ensured, and the application region of the cable is extended. The cable based on a simple and reasonable structure has advantages of small cable diameter, high fiber density, large fiber capacity, and low duty ratio and can be laid in a pipe conveniently; and the bending performance is good. During branched connection, 4 to 24 fibers can be melted once, so that the construction time is saved and the manpower cost is lowered, and the construction efficiency is improved. On the basis of the full drying type dielectric structure, branched connection is realized conveniently and usage becomes convenient.

A bilateral expanding excavation construction method for a middle pilot tunnel of a tunnel is provided. Section or excavation width of the middle pilot tunnel is generally not larger than that of a common double-line or double-lane tunnel; a step construction method is adopted, and the construction method is the same as that of a common double-line or double-lane tunnel; and the construction method is familiar to constructors, and the construction difficulty is avoided. A primary support section of the middle pilot tunnel can be expanded and excavated after being closed by at least 3 meters; if a side tunnel face is stable, and the problem of the operation height of manual installation of a steel frame and an anchor rod is solved, one-time excavation and support can be achieved, and the construction is more convenient; or otherwise, a side tunnel is excavated according to a two-step or three-step method. The primary support of the middle pilot tunnel can be timely closed; the primary support of the side tunnel and the primary support of the middle pilot tunnel can be completely connected in sequence, and various errors and deformation influences of surrounding rocks and the supportare left at an inverted arch part for treatment; and the construction progress is basically the same as that of the common double-line or double-lane tunnel.