Modernization  and  repair  of  self-propelled  machines.  (2)
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Protect the surface of the concrete floor
To protect the concrete floor, which is operated in the normal mode, or is subject to wear in areas with high traffic, there are several ways to protect the surface.
   Comparable ways: their cost, appearance and ability to perform the task to protect.
   In this article, we consider three ways to finish and protect the floor. Each of them has its advantages and disadvantages.
   Thin fil...

Finishing compositions based on water glass. Part 3
When used as part of exhaustion moderator comes coagulation and solidification of liquid glass. However, due to the presence in the composition of Portland cement with a finishing time is an increase strength of the coating due to hydration of cement minerals. Thus from colloids formed during the coagulation liquid glass are actively assigned to the water for hydration of cement, a porous media formed tumors filled Portland cement, which leads to...

Finishing compositions based on water glass. Part 2
Studies in Berlin Institute Federal institute for Materials Research and Testing, show that the average density of 1730 kg/m3 brick large proportion of pores having a size in excess of 1 micron is more than 90% [3] and they are responsible for the increased migration of fluids through brickwork.
   Most fully meet these requirements structure obtained by coagulation and water-soluble potassium silicate forming silica with a high sp...

Modernization and repair of self-propelled machines. (3)
Hardening electrolysis BORATING hinge pins and bushings mates working equipment hydraulic excavators EO-4121 (EA-4321) gives an increase in wear resistance 4-6 times compared to the bulk quenching details.
   Taking into account the high wear resistance of brazed blades, hardened sintered alloys (see Table 1), are recommended for carbide knives dumps graders DZ-122 and RS-98, combined machine E-405 based on KAMAZ, for front dumps a t...

Specialized exhibition Architecture. Construction (END)
Mari-lime brick and gas silicate blocks
   JSC "MZSK" produces silicate brick and a half, color (white, yellow, black, red, blue, green, brown).
   For the production of silica brick used quartz sand from quarries near the plant. Limestone enters the factory with Dobryatinskogo deposit Vladimir region. Silicate brick (Table 1) is used for masonry exterior and interior walls of buildings and structures, as well as ...

Geophysical processes primers and security. Part 5
In the center of Moscow can distinguish vertical structure comprising a crashing into the Earth`s crust magma elongated cylinder (Fig. 2) [5]. In the center section marked lack of extensive vertical zone converted waves ("blind spot"), going from the depths of 70-80 km to 7.5 km. Such "blind spots" are characteristic of the earth`s crust with the introduction of monolithic dense mantle rocks such as gabbro, diabase, etc. In such a zone Tashkent e...

Finishing compositions based on water glass. Part 1
The quality of the decoration of buildings for new construction and reconstruction depend not only on their aesthetic, but also the operational parameters, as good-quality finish - a guarantee of durable service basic designs, long maintenance-free operation, the costs for maintenance and care. Traditional binders used for the production of finishing compositions, liquid glass is widely used, but it has some drawback: coatings based on it gaining...

On possible amendments to the equation Griffiths
Griffith presented a picture of destruction allowed to formulate the problem of determining conditions of the beginning of crack propagation and find its general solution.
   As seen from the above schemes, in the process of crack propagation material directly adjacent to it "coasts" unloaded relaxes. This means that the stress and strain it decreases, and the elastic energy stored earlier in this area of ​​the body is re...

Construction skyscrapers - the requirements of modernity. Part 4
The program is a high-rise building in Moscow
   The project is now a high-rise building in Moscow is implemented in two main areas: the construction of business center "Moscow City" and implementation of the program of the Government of Moscow "New Ring of Russia."
   1. Moscow international business center "Moscow - City"
   The project includes the construction of buildings on the territory of abou...

Degree project - beginning of the road. (3)
Given the great diversity of subject matter and content of diplomas in various specialties, the jury is faced with great difficulties in determining the winners - "Who better violinist or a dancer?". Nevertheless, often based on emotional perception and can estimate the relevance and novelty, and the author`s contribution to the thesis project or job. Absolute winners in recent years have been graduates of Rostov CSO GASU St. Petersburg, Nizhny N...


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 Modernization  and  repair  of  self-propelled  machines.  (2)

To improve the durability of the teeth of excavator buckets, used in northern areas, developed preventive surfacing electrodes EHU-2 BCH-6 and H-OMG. In technology provides periodic surfacing work in the operation of the excavator without dismantling the working body. When designing rock at a temperature from - 35 to -45 C. durability teeth electrodes deposited EHU-2, 6-BCH and HMG-H, superior wear resistance of the teeth become 110G13L respectively 18 and 33.30%.
   Abrasive wear resistance of the ripper tip operating at temperatures from + 20 to -60 C, were examined for bench (standard - alloy AMg-2) and performance tests on the machine D-9g. Performance tests in the north-eastern region of Russia in the development of soil 2-5 categories showed that the welding electrode tip BCH-9 and E-2 alloy increases their resource 1.5-1.7 times in comparison with the resource production of steel lugs 25HGSNMA.
   To increase the life of the excavator bucket teeth for the design of soil 3-4 categories in hot climates, used for regenerative and preventive surfacing with coated electrodes. Recommended strengthening the teeth of steel 40X surfacing electrodes OZN-6. While limiting wear clad teeth occurs after 82-90 hour shifts, serial - 14-16 hour shifts.
   For support-running rollers powerful dozing and ripping units D9-H performance northern recommended reinforcing surfacing PP-cored AN120 under a mixture of flux AN-348A-18 and the ANC in a volume ratio of 2:1. Provides preheating rollers to 200-240 C with an exposure of at least 0.5 hours. Cooling rollers being deposited in the oven for 10-12 hours. This technology increases the durability of rollers 38-40%.
   For surfacing rollers Coil bulldozers based on tractors T-100 and T-130 are recommended wire
   St-08G2S 3 mm diameter and flux mixture of AN-348 and ANC-18 in equal amounts. As a result, welding flanges racetracks and rollers in terms of positive and negative temperatures have endurance respectively 2-2.5 and 1.5-2 times higher than the serial rollers.
   To be continued.