Installation of guardrail accessories

3.1 Base treatment

At the location where the railing posts are installed, the base concrete must not be loose, and the installation elevation should meet the design requirements. Uneven areas must be removed or repaired to be flat. For areas with severe honeycombing and pitted surfaces in the base layer, cement mortar should not be used for repair. Instead, high-strength concrete should be used for repair, and the railing installation can only proceed after a certain strength has been achieved.

3.2 Fixed surface tube

According to the height specified in the drawing, determine the position of the surface pipe installation clip. Draw a line for the zinc steel railing accessories and drive expansion screws. Fix the surface pipe clip onto the wall, and then use rivets to secure the surface pipe.

3.3 Installing the column

First, set out on the base layer to determine the position of the column fixing points. Then, use a percussion drill to drill holes, and install expansion screws. After the screws are fixed, two people are needed to cooperate when tightening the screws. One person holds the column to keep it vertical (using a level ruler) and ensures it doesn’t sway while tightening the screws, while the other person tightens the screws around;

IV. Quality Standards for Zinc-steel Fence Accessories

4.1 The design, dimensions, and installation locations of railings must comply with the design requirements; inspection methods include observation, tape measurement, and review of incoming inspection records.

4.2 The quantity, specifications, locations, and connection points of the railing post fixing points shall comply with the design requirements. Inspection method: check the inspection records of concealed works.

4.3 The height of railings, spacing between columns, and installation locations must comply with design requirements. Railings must be installed firmly and without looseness. Inspection methods include observation, tape measurement inspection, and hand plate inspection.

4.4 The allowable deviation and inspection method for the installation of railings and handrails shall comply with the “Standard for Quality Inspection and Evaluation of High-level Decoration Engineering” for zinc steel guardrail accessories

Verticality of railings: 2mm. Check with plumb line and tape measurement; spacing between railings: 2mm. Check with plumb line and tape measurement; straightness of face tubes and crossbars: 3mm. Check with straight edge and tape measurement; height difference of railings: 2mm. Check with tape measurement