How to apply chemical bolts

　Chemical bolts rely on the grip force and mechanical bite force between the concrete to resist pullout and the bolt itself to resist shear. They are mainly used at the joints of old and new structures. For various mechanical indicators, you can find product introductions from the manufacturers. The calculations must be based on the information provided by the manufacturer. Because the chemical adhesives produced by various manufacturers are different, the bonding capabilities are also different. Commonly well-known brands outside mainland China include chemical bolts produced by German Hilti, German Huiyu Anchor, Taiwan Goodeyou and other manufacturers.； There are many brands in mainland China, and their quality varies from good to bad. Please carefully verify their performance before use. Chemical bolts are a type of post-embedded parts and are used when embedded parts are missing or in post-construction projects.

Characteristics of chemical bolts: Good acid and alkali resistance, low temperature resistance, aging resistance and heat resistance, no creep at room temperature, water stain resistance, stable long-term load in humid environment, good welding resistance, flame retardant properties, good seismic resistance, chemical bolt application advantages, strong anchoring force, no expansion as pre-embedded Expansion stress, small edge distance, suitable for small spaces, fast installation, rapid solidification, saving construction time, glass tube packaging is convenient for visual inspection of tube agent quality, the glass tube is crushed and used as fine aggregate, and the bonding is sufficient. The construction temperature range is wide, from 15°C to 40°C. The anchor thickness is larger.

Application fields of chemical bolts Suitable for heavy-duty fixing on close-to-edge and narrow components (columns, balconies, etc.) Can be used in concrete (=>C25 concrete) Can be anchored in pressure-resistant natural stones (not tested) Suitable for the following anchors: Steel bars, metal components, trailers, machine substrates, road guardrails, formwork fixing, soundproof wall footings, street signs, sleepers, floor edge protection, heavy-duty support beams, roof decoration components, windows, protective nets, heavy-duty elevators, floor supports, construction brackets, transmission systems, sleepers, brackets and shelf systems, anti-collision facilities, car trailers, pillars, chimneys, Heavy-duty billboards, heavy-duty soundproof walls, heavy-duty door fixing, complete equipment fixing, tower crane fixing, pipeline fixing, heavy-duty trailers, guide rail fixing, nail plate connection, heavy-duty space dividing devices, shelves, awning fixing. Stainless steel A4 anchors can be used outdoors, in humid spaces, industrial pollution areas, offshore areas. Galvanized steel, stainless steel A4 are not suitable for humid spaces containing chlorine (such as indoor swimming pools, etc.) Suitable for fixing base plates with smaller wheelbases and multiple anchor points

The chemical bolt process principle uses synthetic resin mortar to bond the anchor rod and the hole wall, so that the anchor rod, anchor foundation and anchored object form a whole, thereby achieving the effect of fixing the component or improving the component's bearing capacity. Chemical Bolting Process Installation Procedure: Drilling - cleaning the hole - inserting the chemical tube - drilling the bolt - gelling process - hardening process - fixing the object 1. Drilling: First, according to the design requirements, determine the position according to the spacing and margin of the drawing, and drill holes on the base layer. The hole diameter and hole depth must meet the design requirements. 　　2. Clear holes: Use air pressure blowpipe and other tools to remove floating dust and dust in the hole to keep the hole clean. 　　3. Insert the medicine tube: Insert the medicine tube into a clean hole. When inserting, the resin can flow like honey under hand temperature before using the hose. 　　4. Drill in the bolts: Use an electric drill to screw in the screw until the agent flows out. Electric drills generally use impact drills or hand drills, with a drilling speed of 750 rpm. At this time, the bolt is screwed in, the agent tube will be broken, the resin, curing agent and quartz particles are mixed, and the gap between the anchor bolt and the hole wall is filled. At the same time, anchor bolts can also be inserted into wet holes, but the water must be drained out of the drill hole, and the waiting time for the gelling process and hardening process must be doubled. 　　5. Gel process: Keep the installation tool still. See details for chemical reaction time. 　　6. Hardening process: Remove the installation tools and wait for the agent to harden. Please refer to the detailed information for the chemical reaction time. 　　7. Fixed objects: After the agent is completely hardened, add washers and hexagonal nuts to fix the object. Chemical bolt quality requirements and control 1. It is best to use a drill bit that matches the anchor bolt when drilling, and the steel bars must not be damaged. 　　2. Before construction, the material mechanical properties of the anchor bolts must be tested. After passing the test, they can be used on site. 　　3. During on-site construction, tests to determine the on-site application conditions of anchor bolts should be conducted to fully test the bearing capacity. The tests are carried out not only in low-strength concrete, but also in high-strength concrete. During the test, the allowable load, corresponding spacing, and thickness of edge components were used to embed the anchor bolts according to the manufacturer's instructions. The test uses axial tensile force, shear force and combined tensile and shear force to determine the effect of load direction on bearing capacity. 　　4. When cleaning the hole, the dust and floating ash in the hole must be cleaned up. 　　5. When applying the medicine tube in winter, it should be insulated in advance to ensure that the medicine tube has sufficient fluidity when inserted into the drill hole (when the hand is warm, the resin flows like honey). 　　6. The screw must be screwed in with an electric drill and is not allowed to be knocked in directly. 　　7. There should be no accumulation of water in the borehole.

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