7 results about "Circular arch" patented technology

This utility model provides a protective device for outdoor electrical cabinets, relating to the technical field of protective devices. It includes an electrical cabinet with two sets of openings (top and bottom). Supporting members are located at the four corners of the bottom of the cabinet, each member being a downward-opening semi-circular arch. Inner corner frames are provided at the internal corners of the cabinet, and outer corner frames are provided at the external corners. An opening frame is provided at the front opening of the cabinet. This utility model can prevent the electrical cabinet from becoming damp and deformed due to rainwater intrusion, as well as from being corroded, thus preventing it from affecting its quality and lifespan. It can also prevent prolonged exposure to sunlight, preventing damage to the electrical components inside the cabinet. This solves the problem of existing electrical cabinets lacking protective devices and being easily corroded.

The invention relates to a semicircular arched full-section roadway excavation device which is used for excavating a round-section roadway into a semicircular arched-section roadway. The semi-circular arch-shaped full-section roadway excavation device comprises a hob milling and excavating assembly which comprises a milling and excavating hob which extends transversely and can rotate, and the milling and excavating hob cuts arc-shaped side walls on the two sides of a round-section roadway into vertical side walls of the semi-circular arch-shaped section roadway; the gangue collecting assembly is arranged behind the hob milling and excavating assembly, extends forwards in the axial direction and is unfolded towards the outer side of the hob milling and excavating assembly, and the gangue collecting assembly collects gangue cut by the hob milling and excavating assembly to an arc-shaped bottom arch of the round-section roadway; and the bottoming and compacting assembly is arranged behind the gangue collecting assembly, the bottoming and compacting assembly is provided with a rolling element capable of continuously rolling, and the gangue in the arc-shaped bottom arch is compacted and flattened. The hob milling and excavating assembly excavates a circular roadway into a semicircular arch shape, the gangue collecting assembly and the bottoming and compacting assembly fill and level up an arc-shaped bottom arch of the roadway, and one-time forming of the semicircular arch-shaped section roadway is achieved.

A multi-part last that can be disassembled in a gently manner, comprising a front portion (20), a rear portion (30), and a wedge portion (40), wherein the bottom of the front portion has a rearwardly extending projection (21), the bottom of which forms part of the bottom of the last (10), which ends in a rear support (22) having an end forming a first circular arch (23), and the front portion is partially open at the top, has a partially open and partially closed cavity (27) shaped in the form of a second circular arc (26), and the lower portion of the rear part has a front face resting on the circular arc of the rear support, and in addition the rear part has a locking projection (34) introduced into and terminating in said cavity, the front and upper faces of which are curved in said second circular arc, and a part of the last (10), when assembled, rests against the concave inner wall of the cavity, which is curved in accordance with the second circular arc, and the wedge part has a shape that fits in a cavity formed between sections (31, 32) forming the frontal surface of the rear part and sloping downwards from above, and sloping lower and upper wedge sections (28, 29), of the front part, wherein said circular arcs are concentric with each other and have their centers (O) at or below the line of the bottom of the last, and the assembled last can be removed from the front part by partial rotation of the rear part about the center after removal of the wedge.

This invention discloses a tunnel boring machine (TBM) and a device for excavating a tunnel with a quasi-circular arch and straight wall cross-section, as well as a construction method. The device includes a TBM main unit, a rock cutter with a rounded corner, a rear-mounted trailer, a muck removal system, and a cutting machine support system. The TBM main unit is installed at the front of the excavation device, and the cutting machine support system is installed at the rear. The TBM main unit and the cutting machine support system are connected via the rear-mounted trailer. The rock cutter with a rounded corner is mounted on the cutting machine support system and is used to cut the tunnel under the control of the cutting machine support system. The TBM main unit, the cutting machine support system, and the rear-mounted trailer all have muck removal systems installed inside. The construction method includes three processes: excavation, step switching, and muck removal. This invention offers high forming efficiency, a short construction cycle, and more flexible rock cutting capabilities, adapting to rocks of different areas and sizes. Furthermore, the excavation and step switching processes of the TBM main unit and the rock cutter with a rounded corner are independent and do not interfere with each other. The structure is simple and the cost is low.

The application belongs to the technical field of tunnel construction, and particularly relates to a tunnel crossing active fault multi-arch anti-fault system. In the tunnel crossing active fault multi-arch anti-fault system, the tunnel assembly is limited by the transverse constraint hinge and cannot displace transversely in the overbreak space, but can only move up and down in the vertical plane of the overbreak space. The multi-arch structure at the bottom of the tunnel assembly comprises a semicircular arch frame and a plurality of sequentially connected circular arch frames. The cooperation of the semicircular arch frame and the circular arch frame can effectively support the tunnel assembly and play a certain buffering role to absorb and dissipate the fault displacement generated when the surrounding rocks on both sides of the active fault relatively displace, so that the actual fault displacement of the tunnel assembly is significantly lower than the actual fault displacement of the surrounding rocks on both sides of the active fault, thereby greatly reducing the influence of the fault displacement of the surrounding rocks on both sides of the active fault on the tunnel assembly and improving the stability and safety of the tunnel assembly.

The invention relates to the technical field of coal mining and roadway advance support, and discloses a short-distance coal seam group mining underlying working face advance support process which comprises the following steps: step S01, active reinforcement support: before fully mechanized coal mining face stoping, a curved surface truss structure is adopted to carry out active reinforcement support in an advance pressure influence range of two crossheading; s02, core supporting is conducted, specifically, a curved surface truss structure is adopted for core supporting; s03, roadway supporting is conducted, specifically, the rectangular-section roadway is supported through a first supporting technology, and the straight-wall arc-arch-section roadway is supported through a second supporting technology; and step S04, monitoring and reinforcing mechanism: installing a mining anchor cable stress sensor in the forepoling area. The forepoling process for the underlying working face during mining of the short-distance coal seam group is convenient to operate, low in working intensity and high in working efficiency.

This disclosure relates generally to a payload separation system utilizing a circular arch connective mechanism for connecting and releasing a payload from a launch vehicle. The apparatus of the invention is particularly useful for spacecraft and other vehicular separation mechanisms.