What are the grating arch accessories and what are the tunnel grating arch accessories

The role of the arch in tunnel construction: to support the tunnel body, it forms a rigid body with anchors, steel mesh, connecting steel bars, concrete, etc., so as to prevent it from collapsing. It cannot be removed and reused after construction, and it is permanently supported in the tunnel.

Difference Between Steel Arch and Grille Arch:

The materials are different, the steel arch is made of H-shaped steel, I-beam, etc.; A grille arch is an arch made of steel bar.

The use is different, the steel arch is used in places with a higher level of surrounding rock; Grille arches are used where the surrounding rock is of a lower grade.

The difference between a steel arch and a grille arch is detailed:

1. The steel arch is divided into H-shaped steel arch, I-shaped steel arch, channel steel arch, miner steel bracket and U-shaped steel bracket according to the production materials, among which the I-beam arch is used in the steel arch in the construction of highway and railway tunnels, and the H-shaped steel arch is second; Miner steel brackets and U-shaped steel brackets are generally used in the support of coal mines and other roadways, and are also made of I-beams in coal mines, but there are very few. Channel steel arches are generally used for small tunnels and are rarely used. In the production process, some are made of finished section steel, and some are made of steel plate cutting tailored welded steel, such as H-shaped steel and I-beam, in which the proportion of H-shaped steel is larger than that of I-beam, and the steel arch is used in places with higher surrounding rock levels.

The steel arch is generally made into an arc with a cold bending machine, can also be pulled with a bending machine, and can also be pulled with a top bending machine, various machinery and equipment have their own characteristics, including processing radius, arc fluency, arc accuracy, and the control of distortion and deformation after steel processing, processing speed, equipment processing capacity, equipment **, etc., the user should choose the corresponding equipment according to the design drawing of the actual arch material.

2. Grille arch.

The grille arch is an arch made of steel bars, which is made according to a certain arc and length like the steel arch, made into a single piece, and then installed at the construction site, and the role is the same as the steel arch, but it is often used in places with low levels of surrounding rock.

The grille arch is composed of main reinforcement, eight-shaped reinforcement, U-shaped reinforcement, ramp reinforcement, and angle steel connecting plate. Among them, it is necessary to use steel bar cutting machine, steel bar straightening and cutting machine, steel bar bending machine, angle steel cutting machine, desktop drilling machine, electric welding machine. When making, the main steel bar needs to be put into a standard mold, and then the other parts that have been prefabricated in advance are installed in the corresponding position according to the drawing, and then welded firmly according to certain requirements.

The radius should be adjusted empirically.

Welding: 1953, the Soviet Union Lyubavsky and others invented carbon dioxide gas shielded welding, promoted the development of gas shielded arc welding, and now mixed gas shielded welding, flux-cored welding wire, slag joint protection welding, self-protection arc welding, etc., 1957 Megeqi invented equal arc welding; 40 generations of German invention of electric beam welding, 50 generations of practical progress and development; The 60th generation of laser welding, plasmization, and beam laser welding now marks a new development of high energy density fusion welding, improving the weldability of materials, making it difficult to use its welding materials for structural welding.

Its welding technology was invented in 1887 by Mei Thompson for resistance welding and used for thin plate spot welding; Seam welding, pressure welding, early and semi-mechanized welding, with the seam welding process, the workpiece is pushed forward by two rollers; Twentieth century century 2

Arch refers to the arc-shaped support used to play a supporting role in civil engineering.

The arch structure is also known as the boom structure, and can also be called the platform structure or the overhead cantilever structure. Nowadays, almost all multi-function placement machines and medium-speed placement machines adopt this structure. This structure generally adopts an integrated base frame, and the X and Y positioning systems of the placement head beam are installed on the base frame, and the circuit board recognition camera (down-looking camera) is installed next to the placement head.

The circuit board is transferred to the working platform in the middle of the machine and fixed, and the feeder is mounted on both sides of the conveyor track, and the component identification camera is installed next to the feeder.

The support is generally inclined connecting structure and remaining code parts, the most common is herringbone and cross shape, and the cross-sectional form can be steel pipe destruction, H-shaped steel, angle steel, etc., and the role is to enhance the stability of the structure. There is a special form of steel support inside the steel support called the steel arch. The steel grille is a kind of arch, the main difference is that the steel grille is welded and assembled by screwing steel, which looks like a cage, commonly known as a flower arch.