Wood anchor with internal thread. Anchor technology
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Design
The combined flexible connection consists of the following elements:
- L-shaped tip (coupling) made of stainless steel;
- basalt-plastic rod with a continuous sandy coating.
To fix the heat-insulating layer in the wall structure with a ventilated gap, a plastic retainer is used (supplied separately).
Specifications
| Flexible connection length | from 165 to 365 mm |
| Rod diameter | 5 or 7 mm |
| Coupling length with flexible connection (anchoring depth) |
20 mm |
| L-tip hole diameter | 7 mm |
| Tensile strength of the rod, not less than | 1000 MPa |
| Bending strength of the rod, not less than | 1000 MPa |
| The force of tearing out the connection from the building base | Depends on fastener |
Country construction today: an anchor for a tree
Our online store presents a professional assortment of modern construction fasteners, which are of high quality and reliability, so that today everyone can quickly and easily - thanks to the detailed descriptions and photos, as well as expert advice from duty managers - to choose the most suitable for the implementation of a particular project in terms of construction (repair or decoration). Products widely demanded in the North-West market, in particular, wood anchors, are popular primarily due to their strength and traditional manufacturing materials, as well as due to a simple, but extremely effective device that provides reliable fastening of wooden building structures, including , to the brickwork.
Anchor for wood, buy on the most favorable terms with delivery in St. Petersburg and the Leningrad region, is indispensable for the construction of low-rise residential buildings (structures) using the so-called "frame" technology, which is very popular today among those who decide to live and / or relax in the countryside, away from the, to put it mildly, "unhealthy" atmosphere of a noisy metropolis. When creating durable and attractive cottages, wood is chosen as the material for load-bearing walls, and the design can be anything - from the classic country style to original author's solutions. Due to the unique ability to "breathe", the tree creates a comfortable, cozy and healthy microclimate inside the premises, and also allows the owner to significantly save electricity, which, in the case of construction from artificial composite materials - for example, aerated concrete or silicate brick - will be used for heating in the cold season and air conditioning to warm.
To ensure reliable protection of the building (structure) from the weather, which is important for the capricious climate of the North-West region, which differs big amount precipitation, low and often unexpectedly changing temperatures, strong winds, as well as mechanical influences, ceramic bricks are used: a wood anchor, the price of fasteners is more than affordable, it will create a reliable and durable connection between the base and the cladding. Interestingly, in this way, old houses are often effectively and relatively inexpensively renovated (expanded, strengthened, etc.). Buying a tree anchor is a good solution for a variety of building materials from wood, including rounded logs and slab materials from wood, plywood and wooden beams; a wide range of sizes makes it possible to choose an optimal length wood anchor in accordance with the parameters of a particular load-bearing wooden wall.
Wood Anchor: Modern "Special Purpose" Construction Fasteners
Relatively inexpensive wood anchors, purchased online in St. Petersburg and the Leningrad region with delivery, today are made from high-quality stainless steel, which is characterized by high corrosion resistance and strength. As a rule, a spacer-connecting element (also known as an anchor) for wood is equipped with a thread at one end, which allows mounting without pre-drilling using a special adapter, and the opposite end of this fastener has a complex geometry, due to which the wood anchor for a long time is firmly held in the masonry joint, reliably fixing the facing layer of ceramic bricks on the supporting wooden structure.
As for the number of fasteners that are widely demanded, it is recommended to use 6 to 8 wood anchors per square meter so that the final building structure is durable and stable. If the project provides for the creation of a ventilation space between the front brickwork and the insulation layer, then it is necessary to complete the anchor with special plastic clamps that are easily fixed to the spacer-connecting element and firmly fix the insulation (for example, basalt slab) at a given distance from ceramic bricks. As practice shows, such a gap ensures optimal removal of excess moisture from the surface of the heat-insulating layer during the entire operational life of the building (structure).
What is an anchor: general information
In general, it is customary to call an anchor a fastener that can withstand significant loads and is made of galvanized metal for fixing heavy monolithic (solid) building structures (also products or equipment) in such solid bases as wood (concrete, brick, natural stone); the word itself came from German language and in translation means, of course, "anchor". The element is held in the material due to a stop or friction, and the reliability of fastening is ensured by spreading the anchor in the working hole using a special device: it can be a wedge or a nut, a screw or a bolt. To date, experts distinguish several varieties of anchors - not only by design or material of manufacture, but also by purpose.
The tree anchor, which can now be bought quickly and easily on a site with intuitive navigation, ensures optimal pairing of individual structures (bearing wooden walls, a layer of insulation, if any, an external protective and decorative layer of ceramic bricks) during construction using the widely used "frame" method, as well as when using any building materials popular on the local market made of natural wood - both modern and traditional. Without exception, all presented fasteners are supplied with certificates confirming compliance with state quality standards provided by a responsible manufacturer.
Are anchors suitable for wood? How to securely attach a chandelier, hanging bed or other massive thing to a wooden beam with them? What other tools can be used when splicing wood structures? Let's figure it out!
Types of anchors
The word "anchor" is of Germanic origin, its main meaning is "anchor". Anchor fasteners are used when mounting a variety of products on a base made of wood or concrete.
There are several types of "anchors":
- spacers;
- persistent;
- adhesive;
- Bolt Molly.
The expansion anchor is held in the workpiece by friction. To maximize it, the rod installed in the hole is bursting with a plastic dowel or wedge with a thread inside.
The fixation of the thrust bolt is ensured by the ribbed or expanding part of it that has fallen into the base. This is how the fasteners used when installing heavy production plants on a concrete foundation are arranged.
Glue "anchors", as the name implies, adhere to the surface due to the sticky composition entering the void between the walls of the hole and the ribbed rod. Most often, the role of the adhesive mixture is performed by a polymer resin with a hardener.
The Molly bolt is used when hanging products on low-strength partitions made of GVL, chipboard, GKL and hollow bricks. In the process of tightening, Molly bursts the outer shell to the sides. As a result, there is a stop, extensively in contact with the base.
On a note: craftsmen often refer to adhesive anchors as “chemical”.
Now let's figure out what type of anchor bolts are suitable for various ways fastenings to wooden structures:
- The Molly Bolt can only be used on a surface that has a large area of voids inside. That is, this method is only suitable for hanging relatively light objects on partitions made of boards, chipboard and lining;
- persistent anchors are used only in the process of creating a massive base. In the case of wood, this is the growth stage of the tree trunk, so such fasteners will not work for us;
- adhesive "anchors" can be used when working with wood, but this is not always advisable due to the high price of this product.
Important: large changes in humidity can cause a loss of adhesion between the body of the cured resin chemical anchor and the walls of the hole, because of this, the fastener will become unusable.
Based on the above facts, we can conclude that the anchor fastener for the tree must be spacer. However, another important factor should be taken into account here: depending on where the effort is directed, the strength of the wood can be different:
- If the force vector runs parallel to the fibers, the material is more tensile;
- When the force vector is perpendicular to the fibers, the destructive force will be many times less.
talking plain language, the tree is more likely to split if wedged between the fibers. At the same time, typical expansion fasteners produce a radial expansion force that can pose a risk to the wood substrate.
To reduce the bursting force, the masters resort to a simple maneuver:
- The wood itself is used as a dowel (wedging element);
- The hole for the rod is made only slightly smaller than the diameter of the ridges of its thread.
A design that matches this description is probably familiar to you - this is ... an ordinary screw!
Fasteners for wood
Fasteners suitable for connecting wood structures have several features:
Manufacturing options
The most common types of wood anchors are:
- hex bolt. It is used for fastening various brackets, plates and other flat and large structures with lugs to wooden bases;
- a stud with a nut, which is screwed in with a wrench (open-end or adjustable);
- a hook that plays the role of a strong suspension and is suitable for mounting chandeliers, hanging shelves, lanterns and so on;
- the ring performs the same functions as the hook. Home it distinguishing feature- the ring prevents the suspended product from jumping off when moving in space (for example, the ring can be used to create a children's swing). To attach a suspension structure to it, threaded or spring carabiners are used.
Mounting
How to screw the anchor on wood with your own hands so that the fastening is as reliable as possible, and the base does not split?
The procedure in this case is not at all different from the technique of screwing in a large diameter screw:
- drill a hole at the attachment point. Its diameter must correspond to the diameter of the fastener along the thread cavities. So, a channel for a 10 mm rod must be made with an 8 mm drill;
- apply some liquid or solid soap to the threads for lubrication;
- screw the rod to full depth.
Important! The depth of the hole must correspond to the length of the rod. If the depth is less, then the bursting force on the wood will increase sharply, which can lead to cracks (if not immediately, then as the structure is used).
Other types of fasteners
In addition to "anchors", wooden structures can be connected using conventional bolts, studs, perforated plates and corners.
bolts
With their help, you can fasten two or more parts with an overlap (although the products to be joined must be thin enough). This fastening method is convenient to use when building up the rafters: two boards are overlapped for three of their widths and, through pre-drilled holes, are pulled together with two or three fasteners with nuts and wide washers.
hairpins
The stud is similar, but compares favorably with the presence of nuts on both sides. This fastener design allows you to tighten the fastener without turning the rod. This is useful if the stud is jammed by the connected parts. In addition, with a long rod, the force required to rotate it can be very large.
Corners and overlays
Perforated steel plates and angles should not be considered as competitors to "anchors".
These types of fasteners complement each other:
with the help of corners, it is possible to dock floor lag boards with beams or crowns without cutting (butt);
plates allow you to connect boards in the same way when splicing rafters or logs.
Important! To make such a connection reliable, choose a plate with a length of at least five times the width of the board. In addition, for screeding boards with overlays, it is worth using not “anchors” and not self-tapping screws, but bolts with wide washers.
Conclusion
Understanding how they interact with wood different kinds anchors will help you choose the best solution for your tasks.
Video: how to mount anchors
All photos from the article
Are anchor bolts suitable for wood? How to properly anchor a massive product - a lantern, a chandelier or a hanging bed - to a wooden beam or wall? What other ways can wooden structures be connected? Let's figure it out.
Varieties of anchors
The word "anchor" itself is borrowed from the German language and literally means "anchor". Anchors are used for .
The following types of these fasteners can be distinguished:
| Type of | Short description |
| Spacers | Friction force is used to hold the base. To maximize it, the fastener inserted into the hole is expanded. For this purpose, a wedge stop with a thread inside, a plastic dowel, etc. is used. |
| Persistent | Fixation is provided by embedding the expanded or ribbed part of the fastener in the base. This is how the foundation anchors used to install massive equipment on a reinforced concrete foundation are arranged. |
| Adhesive | Adhesion to the base is ensured by supplying an adhesive compound (usually a mixture of synthetic resin with a hardener) into the gap between the walls of the hole and the ribbed fastener rod |
| Bolt Molly | This type of anchor is used for attaching attachments to hollow partitions with low mechanical strength (GVL, GKL, chipboard, hollow brick). When the bolt is tightened, it expands the outer shell to the sides, forming an abutment with a large area of contact with the partition |
Useful: adhesive anchors can often be found under a different name - chemical.
And now let's try to analyze which type of anchor suits which:
- The Molly bolt requires a significant area of voids within the structure. As a result, it can only be used for hanging relatively light products on thin partitions made of boards, lining or chipboard;
Ensure a secure fit various items and structures on concrete surfaces, fasteners such as concrete anchors are capable. The problem of attaching various objects to concrete is quite relevant both in the field of capital construction and in the field of repairs carried out by the owners of real estate themselves.
Concrete anchors are able to provide reliable fastening of any structure
Such difficulties do not arise if the fastener must be fixed in a softer material - wood or plastic. If we are talking about concrete - a material characterized by high hardness and, accordingly, brittleness, then it is necessary to use special fasteners, which, in particular, include anchor-type bolts.
What is an anchor: a general concept
The word "anchor" means a fastener used to fix various objects on structures made of solid solid materials - concrete, building bricks, natural stone, etc. To install such fasteners, you should prepare a hole with the appropriate dimensions, in which the anchor type bolt will be placed . The high holding capacity of a bolt placed in such a hole can be achieved by:
- friction forces ();
- bonding abilities of a special composition ();
- a special thrust element interacting with the inner walls of the hole.
The most popular anchor is a fastener, which, due to its design features, wedged inside the hole, thereby ensuring high reliability of the connection being created. The surface of such bolts, made of carbon steel, is coated with a zinc composition, which eliminates the risk of corrosion and development.
Dimensions of anchor bolts for concrete
Installation of anchor-type bolts can be carried out in various designs, the material of which must be of sufficiently high strength. These include, in particular:
- concrete foundations;
- walls and partitions made of concrete and brick;
- floor slabs, which are usually made of concrete.
Objects and structural elements that are fastened with such bolts are usually:
- beams from metal-roll of various types;
- elements of suspended ceiling structures;
- lamps and chandeliers;
- wooden beam used for the installation of floor and ceiling coverings;
- elements of stair structures;
- load-bearing structures with large weight and dimensions.
As mentioned above, fixing an anchor-type bolt inside a pre-prepared hole can be achieved in two main ways:
- by wedging the spacer inside the hole;
- due to a special adhesive composition that binds the bolt and the inner walls of the hole (chemical anchor).
There are requirements for holes in the fastened part that must not exceed the values given in the table. Large gaps can be filled with mortar
Mechanical anchor bolts for concrete
The most common types of anchor bolts are mechanical fasteners.
driven
One of these products is a drive-in anchor, inside the expansion sleeve of which there is a thread. This anchor, designed for concrete and other dense and hard materials, is unclenched in the hole by a special device, after which the fastener itself is screwed into it.
Spacers
Expansion anchors for concrete and other building materials are also widely used on the modern market. In the design of such anchor fasteners, which can withstand very significant loads, there is a special wedge, which is responsible for expanding the expansion sleeve. Using such anchors, it is possible to ensure reliable fixation of even heavy objects on the concrete surface - metal gates, overall equipment, etc. Meanwhile, it should be borne in mind that the fastening reliability provided by such an anchor for concrete work largely depends on the strength characteristics structure in which it is installed.
One of the representatives of this family of fasteners is. Bolts of this kind are used for mounting windows and doors. The expansion sleeve of frame anchors has two wedging zones: at the bolt head and in the body of the bearing base.
In double-expansion concrete anchors, as their name implies, two expansion sleeves are provided at the same time. Due to this, anchors of this type provide a more reliable grip, which allows them to be used for mounting objects with a significant mass.
Wedge
The wedge-type anchor for concrete, which was mentioned above, can have two design options. In the first case, a hammer and a special center punch are used to wedged the inner sleeve of such an anchor. After wedging the sleeve, such an additional device is removed from the inside of the anchor and a fixing bolt or stud is screwed into it.
Installation in other types of concrete is somewhat easier. Their main element is a threaded stud, one end of which is cone-shaped. When tightening the nut, which rests on the surface of the structure into which such fasteners are installed, its conical part expands the spacer sleeve, ensuring its reliable fixation in a pre-prepared hole. In some models of anchor fasteners of this type, the outer surface of the spacer has teeth that provide better adhesion of this element to the inner walls of the hole.
The rod anchor, which also belongs to the wedge type, differs from the usual one in increased dimensions (bolt length). By means of such an anchor, the installation of multilayer systems with a significant thickness is carried out.
The choice of the type of anchor is made, focusing not only on its dimensions, which are stipulated by GOST, but also on the type of fastening that must be performed with it. It is also important to calculate the load that will fall on the concrete anchor. When performing this calculation, it should be borne in mind that the load on the fastener should not exceed 25% of that indicated by GOST.
Chemical anchor bolts for concrete
A fastener of this type is an anchor screw for concrete, the fixation of which in the hole is ensured by a special adhesive composition. The adhesive composition, with the help of which chemical anchors are fixed, is poured into a pre-made and carefully cleaned hole for two thirds of its length. An anchor bolt of the appropriate size is installed in the hole with glue. After the adhesive composition has completely solidified, the required item is fastened.
Anchor - a combined independent fastener, which is fixed in the bearing base and holds certain structures. The element is made of aluminum, brass, stainless steel and other similar materials. The anchor is available in various sizes. The length varies between 55-220 mm, width 8-24 mm.
The anchor is used for bricks, concrete and blocks, natural stone and sheet materials (gypsum board, chipboard, etc.). There are furniture, facade and foundation bolts, which are respectively used to fasten furniture, facade or. In addition, the elements are divided according to the type of “anchor”, installation and fixation.
Anchor types
- Spacers are held in the structure by friction. To increase the strength of the fastener, the installed rod is bursting with a wedge stop with an internal thread or a plastic dowel;
- Thrust bolts have an expanding or ribbed part that provides a strong and secure fixation. Such an anchor is suitable for arranging the foundation and concrete structures;
- Adhesive or chemical fasteners are fixed due to the sticky composition. Most often it is a polymer resin with a hardener;
- The Molly bolt is suitable for insufficiently strong and hollow materials, including chipboard, drywall, plywood sheets, hollow bricks. When this anchor is tightened, it begins to expand the outer shell to the sides, which forms a stop.
Anchor for wooden structures
When connecting wooden structures and in wooden construction, it is important to choose the right fasteners, which will not only provide reliable fixation, but also will not damage the natural material. In this case, an adhesive or chemical anchor is not recommended, since the resin hardens with large temperature and humidity changes. This loses traction and renders the mount unusable.
The Molly anchor is only suitable for surfaces in which there is a void of significant volume. Such fasteners are used to hang objects with a light mass on internal partitions or walls made of clapboard, board or chipboard. Persistent products are used only for a massive base. These include only the trunk of a growing tree, so these fasteners are not suitable for building a house from a log or timber.
Wood fasteners should have a large thread diameter over 6 mm to reinforce the low mechanical strength of the wooden base. To prevent corrosion and a negative effect on wood, fasteners need to be brass-plated or galvanized. Or you need to choose products from anti-corrosion materials. In this case, wooden dowels are perfect.
Classic metal fasteners corrode, which leads to rotting of the wood. Lumber is covered with mold and fungus, swells and softens, gradually collapses. Therefore, choose an anchor and other fasteners made of anti-corrosion materials or with special processing. How to install a log house with your own hands, what fasteners and materials you will need for this, read.
How to screw an anchor into a tree
It is important to properly screw the anchor into the wood to ensure a secure fit without splitting the wood. First, a hole is made in the right place with a drill, which corresponds to the diameter of the fastener along the thread cavities. Then the thread is lubricated with solid or liquid soap and the rod is screwed in.
It is important that the depth of the hole made is equal to the length of the rod! With a shorter or insufficient length, the bursting pressure on the wood increases, which leads to the appearance of cracks. Masters of "MariSrub" will select the necessary fasteners and materials, correctly assemble the log house and finish the house. We comply with the technologies and rules for the construction of wooden houses!
The MariSrub company harvests wood and manufactures sawn timber on its own, which guarantees high quality and strength of products. Each log and bar undergoes antiseptic and protective treatment, which prevents rotting and cracking of natural wood, the appearance of mold and fungus.
We offer individual design and modification already finished project. We carry out "turnkey" with the selection of the necessary materials and fasteners, prompt and reliable installation of a log house, insulation and waterproofing of the house, installation of the foundation and roofing, installation and commissioning of engineering networks, finishing and finishing work. We guarantee efficiency and timeliness, quality and durability of construction!