Anchors: what is it and why

Of the entire list of fas­ten­ers for con­struc­tion, anchors are char­ac­ter­ized by max­i­mum strength. With the help of anchors, both strong (con­crete, sol­id brick, nat­ur­al stone) and not very strong (foam con­crete, aer­at­ed con­crete, hol­low brick), the most crit­i­cal parts or struc­tures are attached. In con­struc­tion anchor fas­ten­er is active­ly used for arrang­ing canopies, fix­ing stair rail­ings, beams, fences and ele­ments of engi­neer­ing sys­tems, installing columns or racks, fix­ing dec­o­ra­tive ele­ments on walls and ceil­ings, as well as fix­ing scaf­fold­ing at the stage of work. With the same dimen­sions anchors with­stand greater loads than, for exam­ple, nails, dow­els, nails, but they are more dif­fi­cult in design, instal­la­tion and high­er in price.

If you need to be as con­fi­dent as pos­si­ble in the strength of the fas­ten­ing, you should choose the anchor as the fas­ten­er. Accord­ing to Wikipedia, the word comes from the Ger­man “anker” — “anchor”. Man­u­fac­tur­ers pro­duce a wide vari­ety of anchor­ing equip­ment in terms of design, mate­r­i­al of man­u­fac­ture, pur­pose, instal­la­tion and oper­a­tion fea­tures. The most com­mon is the fol­low­ing clas­si­fi­ca­tion, reflect­ing the design and instal­la­tion of anchors:

• mechan­i­cal

• chem­i­cal

Mechan­i­cal anchors

Expand­ing, dri­ving, mort­gage, wedge — these are all mechan­i­cal anchors. As a rule, in the design of such hard­ware there are spac­er, burst­ing and fix­ing com­po­nents. For exam­ple, con­sid­er one of the most pop­u­lar both indus­tri­al and pri­vate appli­ca­tions, the wedge anchor.

The wedge anchor pro­vides a strong attach­ment to the base of con­crete, stone, sol­id brick. The basis of the prod­uct is a rod with a thread on one side and a cone on the oth­er. A split sleeve is put on the cone. A nut with a wash­er is screwed onto the thread. To install the anchor, a hole is drilled in the base, cleaned of dust and dirt. It must exact­ly match the diam­e­ter of the fas­ten­er. After align­ing the holes in the base and the attached part, the wedge anchor is ham­mered into the hole with gen­tle ham­mer blows. When the nut is tight­ened, the cone approach­es and bursts the sleeve, which is firm­ly fixed in the base due to fric­tion. To obtain a reli­able bond, fol­low the man­u­fac­tur­er’s instruc­tions:

• ensure the spec­i­fied tight­en­ing torque

• the hole must match the mark­ing of the anchor

• the base is sol­id, with­out shells and oth­er flaws

• the dis­tance from the edge of the base must not be less than that spec­i­fied by the man­u­fac­tur­er

Wedge anchors are avail­able in a wide range of sizes. From the whole­sale sup­pli­er Mashkrepezh on the site www.rusbolt.ru they can be bought in lengths from 50 to 600 mm, diam­e­ters from M6 to M24.

Chem­i­cal anchors

For loose or hol­low foun­da­tions, the prin­ci­ple of phys­i­cal expan­sion is not suit­able — the mate­r­i­al sim­ply col­laps­es. In this case, a spe­cial adhe­sive com­po­si­tion is first pumped into the hole, then a rod with a thread­ed end is already placed in it. Two-com­po­nent adhe­sive com­po­si­tion (hard­en­er and resin) is made on the basis of polyurethane, acrylic, poly­ester resins with fillers. The hard­en­er and resin are mixed direct­ly before being pumped into the hole. This method is sim­ply indis­pens­able for frag­ile foun­da­tions. In chem­i­cal anchors, there is no spread­ing force, they can be placed clos­er to the edge of the base. Dis­ad­van­tages — high cost, instal­la­tion is more dif­fi­cult and takes a long time, up to 1 hour.

The pub­li­ca­tion is placed as adver­tis­ing

Source: TopClimat.ru