Heating main tray l 4 8. Heating main trays. Concrete channels and tunnels

Reinforced concrete prefabricated trays for heating mains are manufactured according to Series 3.006.1-2 and belong to the tray elements of channels and tunnels. The concrete used for the production of these products can be graded from M200 to M450. Heating main trays are marked with the letter L and two numbers - the serial number and the vertical dimension design load. The marking may contain the letter d, which means that this tray is an additional one. For example, for tray L4-8, tray L4d-8 will serve as an addition. All extensions are 740mm long. According to the above Series, the length of solid heating system trays should be 5970 mm, but for ease of transportation and installation, our plant, like many other manufacturers, makes trays 2970 mm long. This is allowed by the standard, since it preserves the serial reinforcement scheme for heating system trays. With this design, it is possible to use fractional markings in the name of the trays, for example L6-8/2, which will mean half of the nominal length of the serial product. By prior agreement with the customer, it is possible to manufacture a heating main tray with embedded products. They are often required for fastening communication elements inside heating system trays.

They are used for laying not only various pipelines, but also electrical cables. These products are used both in normal soil conditions and on subsidence soils. The heating main from these trays can be mounted even under automobile and railways. Semi-underground installation is possible. Typically, heating main trays are used together with covering slabs.

In the absence of groundwater for heating main trays, sand preparation with a thickness of no more than one hundred millimeters is made. In those places where the trays are adjacent to the chambers, special expansion joints and then fill them with bitumen. When laying steam pipelines every hundred meters, the heating main must have an installation outlet. For water networks this distance will be two hundred meters, and for electric networks - one hundred and fifty. To protect against corrosion, it is planned to cover the heating main trays with a layer of bitumen. Hermetically sealed tray insulation is also important because it prevents the leakage of air, which is contained in the heating main channel and has thermal insulating properties. This reduces possible heat loss.

Before starting the construction of a heating main from tray elements, it is necessary to carry out certain preparatory work. Firstly, it is necessary to clear the strip along the future heating main. Secondly, when conducting earthworks it will be necessary to guarantee the safety of existing communications running underground in a given place, or to relocate them. Also, do not forget about drains so that water does not stagnate in the trenches. The time interval between digging a trench and laying heating main trays into it should not be long. As a rule, these types of work go parallel to each other. The soil removed from the trench is accumulated in the form of a dump on both sides of the future heating main. If digging occurs during digging, the bottom is backfilled and then leveled with sand. The bottom of the trench is carefully compacted. This must be done in order to avoid future distortions of the installed trays. IN winter conditions During construction, it is prohibited to install a heating main tray on frozen ground. Before installing the tray, it is necessary to warm up this area.

During the installation of heating mains from concrete trays, the joints between them are carefully sealed. In parallel with the joining of the trays, the heating main is filled with pipelines for various purposes. After the communications are installed inside the trays, they begin to backfill the trench using a bulldozer. Each layer must be compacted. IN winter period time, the soil used for backfilling must be thawed.

At all. This makes it possible to produce heating main trays of grade L 4-8 4 with a high degree of reliability and with excellent characteristics duration of operation. Do not forget that such requirements apply to reinforced concrete products of this class for a number of justified reasons. Firstly, and this is most important, the need to provide utilities hidden deep underground with reliable protection. Secondly, the slow destruction of communications is impossible to predict - they are hidden from inspection. And finally high cost and the difficulty of carrying out land and restoration work if necessary, especially in winter.

Heating main trays of grade L 4-8 are found as much as possible effective application as structural elements when designing channels KLp 60x45 KL 60x45. Their operational characteristics make it possible to use them when the route lies at great depth and with an abundance of groundwater. The dimensions that characterize heating main trays of brand L 4 8 4 are as follows: 2970x780x530 in external dimensions, that is, length, width and height, respectively. The trays weigh 900 kilograms, which allows them to be installed without the use of heavy lifting and special equipment.

Our company’s specialists tirelessly monitor compliance at the manufacturing plant with all regulations and production standards, as well as careful adherence to the established work technology. This allows us to supply products to the market, in particular, heating main trays of brand L 4 8 4 High Quality at a more than reasonable price.

You can order heating main trays brand L 4-8 4 and consult on reinforced concrete products by calling the numbers listed at the top and bottom of the site, call!

Heating main trays, grade L 4-8 2

One of the most common structural elements in the construction of water drainage systems without deepening the drainage main are heating main trays of grade L 4-8 2. The features of their manufacture, which include the complexity and multi-stage conveyor production of reinforced concrete products, represent a number of complexes necessary to ensure maximum economic profitability use of materials while maintaining the necessary technical characteristics. The special approach given to the production of heating main trays such as L 4 8 2 allows the use of this multi-purpose product without fear for the effective operation time and reliability of each element of the water drainage system. The trays are highly resistant to corrosive influences, the influence of microorganisms on the structure of concrete and the effects of aggressive environments, including the organic components of these environments. Also, heating main trays of grade L 4-8 2 are widely applicable in the construction of underground communications serving as the location engineering structures of various kinds: from heat pipelines to communication cables.

It is worth noting that reinforced concrete, based on the production scheme, is a material with high porosity, sufficient for plant organisms to settle in microcavities, which, when growing, disrupt the surface structure of the product, which can lead to irreversible consequences for most communications. That is why the production cycle of such reinforced concrete products as heating main trays of grade L 4-8 2 includes bench operations with mandatory vibration treatment of the composition and ironing of the surface. This technology allows the product to provide maximum resistance to water, air and organic erosion.

Heating main trays, grade L 4-8 2, are characterized by the following overall dimensions: 5970x780x530 millimeters. Thanks as much as possible effective use starting materials The trays are light in weight. Thus, heating main trays of grade L 4-8 2 have a standardized weight of 1800 kilograms, which allows their installation using small-scale mechanization.

When choosing a manufacturer and supplier of reinforced concrete products, it is important to pay attention to the features of their production at a factory or landfill and transportation conditions. Our specialists constantly monitor compliance regulatory technology production of reinforced concrete, products made from it and the conditions for their further transportation. This ensures that heating main trays of brand l 4-8 2 are in full compliance with GOST 13015 standards. We are directly interested in supplying you with high quality with appropriate performance indicators.

You can order heating main trays brand L 4-8 2 and get advice by calling the numbers listed at the top and bottom of the site, call!

Reinforced concrete trays L 4-8 for heating mains are special multifunctional products that are widely used in most areas of construction: household, road, railway, industrial, residential, etc. Trays are used for laying pipelines, heating mains, installing cold and hot water supplies, in the construction of gas and drainage structures and drainage systems, drainage channels, as well as in power supply when laying electrical cables and other communications.

Reinforced concrete trays L 4-8 for heating mains are a prefabricated open structure with a bottom and two sides located opposite each other, the cross-section of the tray is made in the shape of the letter “P” or “U” with rounded corners. A floor slab is installed on top of the tray to provide access to the contents of the tray, additionally ensuring the tightness of the structure, protecting the contents from moisture. This solution simplifies Maintenance and repair of pipeline systems - in order to get into the pipeline compartment required for inspection or repair, it is enough to dismantle the slab. Also, in the construction of heating mains, the slab does not allow air to leave the tray, retaining heat.

Reinforced concrete trays L 4-8 for heating mains are structures that are completely ready for installation in the ground. The technology for laying trays is quite simple: the products are laid in a pre-prepared earthen trench, which is a dug trench (in the case when construction is planned at a facility located on soft soils, the earthen trench is filled with a sand cushion or a special concrete cushion is installed), and they are mounted on top reinforced concrete slabs ceilings The following design option is also possible: first the slabs are laid, then the trays are installed on them upside down.

Reinforced concrete trays L 4-8 for heating mains are one of the most functionally necessary components in construction when laying heating mains, electrical and other types of wiring in conditions in which existing communications are threatened mechanical damage during operation. Simplicity of design, ease of maintenance and durability of trays are just a few reasons that indicate the advisability of using reinforced concrete products. Concrete trays are equipped with high-strength steel, which allows the products to withstand significant loads and maintain their original properties throughout the entire period of operation. The surface of the trays is covered with special water-repellent and anti-corrosion mixtures. One of the main advantages can also be called the low cost of raw materials, which, taking into account the durability of structures, significantly reduces construction costs.

Trays L 4-8 for heating mains are made only from heavy concrete with compressive strength classes B15, B25, B30 and B35. The class of concrete for frost resistance and water resistance depends on the hydrogeological conditions of the proposed construction site, as a rule, from F50 and W2, respectively. To increase durability and wear resistance to aggressive environments, concrete for trays is treated polymer compounds. The trays are reinforced with welded frames and steel meshes classes A-I, A-III and ВрI. Depending on the projected load, hot-rolled or prestressed steel is prepared. All metal elements additionally undergo anti-corrosion treatment.

Reinforced concrete trays L 4-8 for heating mains are concreted in a horizontal position with the walls down. To remove products from the formwork in the walls of the trays, stripping slopes are provided in relation to at least 1/15 of vertical axis. Mounting loops are provided for slinging the trays when removing them from the formwork. The trays are removed from the formwork after the concrete reaches 70% of its design strength.

Trays L 4-8 for heating mains are tested for strength using a non-destructive method in accordance with GOST 8829-85 “Methods for testing and assessing strength, rigidity and crack resistance”. To ensure reliable joining of the tray and slab, you should follow following conditions: the maximum permitted deviation of the straightness of the profile over the entire surface of the product should be no more than 8-10 mm. In this case, exposure of the reinforcement is strictly prohibited. Sinks, depressions and sagging on the surface of products should not exceed 3-6 mm in diameter.

Reinforced concrete trays L 4-8 for heating mains must be stored in stacks. The height of the stack is determined from the condition of ensuring safety requirements and in accordance with SNiP III-4-80 “Safety in Construction” and should be no more than 2.5 m. Wooden spacers with a thickness of at least 3 cm are required to be installed at the same distances from the ends of the elements , as the mounting loops, as well as in the places where the ribs of the trays join.

Reinforced concrete trays L 4-8/2 provide protection utility networks from most external threats. Among them:

• entry of debris and water into the laying area;
• severe heat loss from the heating system due to temperature changes;
• theft of cables and pipe insulation, vandalism;
• accidents;
• landslides.

It is allowed to install such reinforced concrete products when creating water supply, sewerage, heating mains, and cable networks. Universal products are used as drainage for road construction, drain water and prevent the embankment from eroding.

The design provides protection on three sides. For complete sealing, you need to use it in conjunction with a reinforced concrete slab - models OP, PP and PT.

Features of manufacturing trays L 4-8/2 for heating mains

In the production of reinforced concrete trays L 4-8/2 are used heavy brands concrete. The strength class must be at least B15. Solutions with grades corresponding to B35 are often used. During production, we strictly monitor compliance with the recipe. Sand, water, cement and aggregate are used. To increase resistance low temperatures and humidity, additives are added to the composition.

To protect against cracking and crumbling, steel reinforcement is used to increase strength. The use of classes A-1 and A-3 is allowed; this is regulated in GOST 6781-82. Most often used in reinforcement steel mesh from interconnected rods. According to series 3.006.1-2.87.3-5, two types of meshes can be used in work:

• With 2-4-2,
• From 3-7-1.

Mortgages according to GOST must be made only of rolled steel. The design also includes loops for moving heavy reinforced concrete products using special equipment.

The production uses the vibrocompression technique. Provided that the formwork is properly concreted, this technology significantly increases the quality of the product, ensures the elimination of internal voids, and increases density.

Characteristics and parameters of trays L 4-8/2

For use in Russian climate conditions, heavy loads, high humidity tray L 4-8/2 must meet the following parameters:

• Water resistance W2-W4. Precast concrete does not accumulate water even with constant direct contact. This prevents cracks from forming due to expansion during freezing.
• Frost resistance from F50 and above. Reinforced concrete trays L can withstand more than 50 defrost-freeze cycles.
• The grade of concrete in terms of compressive strength is not lower than M200, since resistance to loads, vibration and other external threats is important.

The mass, wall thickness and standard sizes trays L 4-8/2 - width and length for each plane.

How to read the markings?

The dimensions of trays L 4-8/2 can be determined by looking at the markings. The series 3.006.1-2.87 encodes all the main characteristics of the product. An example of a standard designation: L 13-5 6767 × 9987 440. This combination is deciphered as follows:

• L - type of product, in our case, tray;
• 13 - serial number;
• 5 - extremely permissible load, indicates whether networks can be laid under highways;
• 6767 — length of reinforced concrete products;
• 9987 - width;
• 440 - height.

If after this designation another combination of numbers is written, this is the geometric volume of the model.

Features of storage and transportation of trays L 4-8/2

The goods are transported to the storage location by special transport and secured. In the warehouse, it is allowed to evenly stack products on top of each other, but no more than three pieces. A material can be placed between them that can evenly distribute the load. Do not allow one of the sides to sag or overload the tray - cracks will appear.

You can buy reinforced concrete channel trays for heating mains from us. The company own production, therefore the price is lower - there are no extra charges from intermediaries. We deliver throughout Moscow using our own transport and unload on site. We are ready to deliver other types of reinforced concrete products used for laying utility networks. Call or leave a request on the website.

Reinforced concrete trays L 10d-3

High-strength U-shaped brackets made of reinforced concrete, which are indispensable in the construction of canals and tunnels. The range of trays includes a huge number of different reinforced concrete products, which are used everywhere. Modern trays are designed for a long service life in the most different conditions– in contact with groundwater, urban reagents, systematic changes in temperature and humidity. Trays L 10d-3 are recommended for laying pipelines for various purposes, electrical cable channels and electrical busbars. Series 3.006.1-2.87. release 0 also specifies that reinforced concrete trays can be used as the basis of underground passages, tunnels, underground galleries (except for areas with high seismic activity). Unlike drainage and sewer trays, liquid transportation through such channels is not provided. Channel nodes, compensatory niches and widenings, chamber locations, angles and turns of channels are fixed by the release of the 5th standard album Series 3.006.1-2.87. . Structures with a height of up to 1500 mm are classified as channels, and structures up to 1800 mm are classified as tunnels.

Concrete trays are used in ordinary soils, subsidence and water-saturated soils, in areas with seismicity up to 9 points.

Concrete channels and tunnels

Tray routes are very easy to maintain - you just need to dig out the channel to begin repairing or servicing the system. Channels are laid, including under the road surface, under railways, off roads with a depth of 0.5 to 6 meters, in workshops with minimal depth. Trays L 10d-3 provide for semi-underground installation with a depth of 200-400 mm.

In addition, due to their price, concrete heating main trays have become one of the best-selling reinforced concrete products. Concrete trays are produced by vibration casting.

The climate of Russia requires significant stability from any reinforced concrete products; for this, reinforced concrete technologists try to provide trays with the most perfect composition - using plasticizers, air-entraining and other additives. Quality concrete surface tray is also a sign of a durable channel - on the surface of reinforced concrete products, shells larger than 6 mm, chips larger than 50 mm, delamination of concrete, reduction in the thickness of the protective layer to the reinforcement and, of course, cracks are not allowed. All tray elements are tested for strength, rigidity and crack resistance in accordance with GOST. The weight of the L 10d-3 tray is 430 kg; for its safe installation, the structure is equipped with steel hinges.

Dimensions of reinforced concrete trays

Series 3.006.1-2.87. assumes the dimensions of concrete trays: length 5970 mm, width 420-4000 mm, height 360-1310 mm. Tall and wide reinforced concrete trays are recommended for constructing tunnels. Additional trays with a length of 720 mm are designed for each standard size of ordinary products. Heavy concrete for the manufacture of trays has significant compressive strength B15-B35.

Reinforcement of reinforced concrete trays

To withstand the pressure of the soil and flat removable slabs, the L 10d-3 trays are reinforced in a special way. Reinforcement schemes include Series 3.006.1-2.87. issue 1. High-quality steel without prestressing is used - A-I, A-III and BP-I wire. Strengthening is provided by welded mesh and frames inside the trays, the thickness of the protective concrete layer up to the reinforcement is 15-20 mm. All steel parts of the trays have surface anti-corrosion protection. Reinforcement and embedded products for trays are determined by Series 3.006.1-2.87. Issue 3, where you can learn more about the strengthening of this type of reinforced concrete.

Today Series 3.006.1-2.87. , which determines production standards and working drawings of trays, is considered invalid. But reinforced concrete structures are actively producing trays of all brands for the construction and reconstruction of existing networks. You can purchase heating main trays in the required configuration using the convenient service of the Kompleks-S company. Special requirements for frost resistance and water resistance of concrete tray L 10d-3 must be indicated in the application. The strength and endurance of trays is controlled in accordance with GOST; from us you can only buy certified trays with the necessary accompanying documents.

Concrete trays– price and characteristics

Concrete heating main trays are used to protect hot and cold water supply pipeline systems, as well as drainage systems of various networks. Concrete trays provide protection of communications from shifting, soil collapses, active exposure to humidity and biological media, corrosion, and also help to better maintain temperatures hot water and heat supply.

In Russia trays series 3.006.1-2/82 are actively being purchased for the construction of urban network channels. Thanks to low prices to factory quality elements laying channels becomes a quick and simple operation. Paired with trays, they buy covers (channel covering plates), which you can also buy on the Kompleks-S company website. Waterproofing and thermal insulation thanks to heavy concrete lasts for for long years operation. Modern reinforced concrete structures produce channel elbows of high durability; according to GOST, they are tested for strength, rigidity and crack resistance. The functions assigned to reinforced concrete trays quite strictly outline the requirements for the quality of concrete brackets. This is not only the preservation of rigidity and tightness, but also resistance to systematic exposure to moisture and chemical environments. For this purpose Series 3.006.1-2.87. Issue 0 provides measures for anti-corrosion protection of concrete and its overall density.

Installation of concrete trays

The piping system requires high-quality installation and compliance with all required technologies. In this case, the structural ergonomics of the system requires the accuracy of the geometric dimensions of the trays and lids. The dimensions of the trays are selected according to the diameter of the pipes and thermal insulation, so that maintenance and repair of the pipeline when excavating the channel is accessible.

Important characteristic concrete channel trays - wear resistance, which is confirmed in laboratory conditions by manufacturers. The channel must be resistant to possible seismic ground disturbances, and also be able to work in water-saturated and soft soils, supporting the heating main in any conditions. Series 3.006.1-2.87. Issue 0 defines channel operating conditions and design recommendations.

Tray marking

Series 3.006.1-2.87. Issue 0 requires trays to be marked with an alphanumeric combination. First, the letters indicate the type of product, then the serial number of the standard size and the magnitude of the vertical, uniformly distributed load. Additional embedded products are designated by the letter “a”.

For example, consider the marking L 1-15(5970x420x360 mm), where:

• L - reinforced concrete tray;
• 1 – standard size;
• 15 – the magnitude of the vertical uniformly distributed load.

The paint on the tray indicates the brand, weight, production date and QC stamp.

Product quality control

Large developers organize strict input control with testing of trays according to various indicators. But, even if conditions do not allow triple serious testing, it is necessary to carry out an external inspection of each L 10d-3 tray.

the concrete of the tray elements making up the channel or tunnel must not have cracks. Only shrinkage cracks with a width of no more than 0.3 mm are allowed.

The factory reinforced concrete tray according to GOST must correspond to its design dimensions. The length and width of the channel element can be 10 mm greater than the calculated one, and the height - by 7 mm. In order for the joining of the tray and the slab to be better, the straightness of the profile must be maintained - deviations of no more than 8-10 mm over the entire surface of the product. Protective concrete layer must have a uniform thickness, that is, not deviate from the norm by more than 5 mm.

Product weight deviation is allowed within 7%. Welded frames and meshes should not be exposed under any circumstances. Embedded products must be treated with anti-corrosion protection.

Sinks, nodules and depressions in the concrete surface of reinforced concrete trays should not be more than 3-6 mm in diameter.

On acceptance tests control the following parameters of tray elements:

• concrete strength (class of concrete in terms of compressive strength, tempering strength);
• compliance of reinforcement and embedded products;
• quality of welded joints;
• thickness of the protective layer of concrete to the reinforcement;
• accuracy of overall dimensions;

Our specialists provide each batch of trays with technical factory data sheets. The document for concrete products indicates:

• grade of concrete in terms of strength and its average density;
• tempering strength of concrete and actual tempering density of concrete;
• concrete grade for frost resistance and water resistance;
• date of manufacture of products;
• number of reinforced concrete products;
• indication of compliance with the state standard.

Storage and transportation

In warehouses and facilities, reinforced concrete trays are stored in accordance with special schemes storage, which includes Series 3.006.1-2.87. issue 1. Transportation of trays L 10d-3 is possible anywhere in Russia by road and rail. Our specialists have more than 12 years of experience in delivering various precast concrete products, so we guarantee fast and careful delivery of trays. During transportation, it is necessary to fix the reinforced concrete trays in the body and use wooden spacers with a thickness of 30-60 mm. Careful unloading will protect the trays from chips and cracks, which could disrupt the tightness of the channels.