43results about How to "Increase the construction work area" patented technology

The present invention relates to a one time supporting arch subsurface excavation reversed construction method. The steps of the method are as follows: at least a pair of upper guide hole and lower guide hole are respectively excavated in a top body and a bottom body corresponding with an underground structure design space; each pair of guide holes forms one span; then the hole wall is processed for primary supporting; the bottom of the lower guide hole is laid with a waterproof layer; the waterproof layer is casted with an underlayer frame structure soleplate; a slope stake and a middle upright post are constructed from the upper guide hole; the arc top of the upper guide hole is laid with the waterproof layer, and an arc top permanent structure is cast; then a midspan soil body is excavated between two upper guide holes by a subsurface excavation method to form a midspan upper guide hole and to be constructed as a midspan upper guide hole arc top permanent structure; the primary support at the bottom of the upper guide hole is chiseled and removed; a soil body is excavated downwards, and a structure lateral wall and a middle floor slab are cast; the rest partial solid between the primary support at the top of the lower guide hole and the middle floor slab is excavated, at the same time, the primary support at the top of the lower guide hole is chiseled and removed, the rest lateral wall structure is cast, and an even span structure soleplate is closed. The method has small construction risk, large construction field and fast construction speed, uses few big guide holes and solves the technical problems of the large amount of the guide hole, the small size of the guide hole, small construction space, multiple times of structure stress conversions, the repeated perturbation of wall rock, etc of the traditional subsurface excavation method.

The invention discloses a form-finding rigid connection method for erecting a steel truss stiffening beam of a suspension bridge. During implementation, a reasonable hoisting method and erection sequence are selected according to design data and comprehensively considering factors such as restrictions on construction site transportation conditions, and a specific temporary connection of stiffening beams is formulated. When erecting and installing the stiffened girders, follow the rigid connection scheme and the bridge deck welding scheme; in the process of erecting the stiffened girders, use the linear changes of the installed girder sections during the construction process to find the corresponding stress-free The rigid connection of the beam sections is completed under the stress-free state, and the welding of the bridge deck of each beam section is carried out after the rigid connection of each beam section is completed; when all the stiffening beams are erected, the rigid connection and welding of the beam sections are also completed simultaneously. Welding of bridge decks. Compared with the traditional construction technology, all temporary hinge joints need to be converted from hinge to reinforcement after the bridge deck construction and counterweight construction are completed, which has been greatly improved.

A retractable asphalt spraying device with internal double circulation channel, which is mainly composed of a support frame, a fixed spray rod assembly, a left telescopic spray rod assembly and a right telescopic spray rod assembly of the same structure, and an asphalt spray valve. The assembly is installed on the support frame; the left telescopic spraying boom assembly and the right telescopic spraying boom assembly respectively include a first-stage asphalt pipe, a secondary asphalt pipe, a rotary joint, a side spray pipe and an asphalt spray valve; the first-stage asphalt The pipeline, the secondary asphalt pipeline, and the side spray pipe are divided into an oil inlet passage and an oil return passage by a partition, and a flow inner pipe with a small diameter is arranged in the rotary joint. The hydraulic motor on the support frame drives the transmission gear, and drives the transmission rack fixed on the left telescopic spray rod assembly and the right telescopic spray rod assembly to make a linear motion, so as to realize the unfolding and closing of the left telescopic spray rod assembly and the right telescopic spray rod assembly. Retracted; it can realize asphalt circulation without external pipes, with large spreading width and simple structure.