SU953063A1 - Installation for continuous heating of road paving base - Google Patents

Description

(54) INSTALLATION FOR CONTINUOUS HEATING OF THE ROAD COVERING BASE

one

The invention relates to road construction, in particular, to devices for preparing a road base prior to laying a pavement.

A device for heating a road surface is known, which includes a self-propelled chassis and a heater 1 placed on it.

The disadvantage of this device lies in significant heat losses, which reduces its efficiency (}), especially when performing work with negative air temperatures.

Closest to the invention is a road construction plant by thermally treating the soil, comprising a traction means and a heater connected in series with it and a thermal insulation section of interconnected links 2.

A disadvantage of the known installation is the insufficient efficiency of heating the upper layer with exhaust gases of the heater due to heat loss and the irrational size of the heat insulation section, which leads to increased fuel consumption, especially during periods of negative temperatures.

The purpose of the invention is to increase the heating efficiency and fuel economy during the period of negative temperatures.

The goal is achieved by the fact that in an installation that includes traction means 5 and a heater connected in series with it and a warming section of interconnected links, the links are hollowed out in the form of thermal caps of an arched outline supported on a runner, and the Q connection of the heater with a warming section in the form of an airtight hinge joint, the length of the insulation section being determined from the dependence

o, g.

15 E

m

where v - installation speed, m / s; h is the depth of the heated base layer, m;

2Q a-coefficient of thermal diffusivity of base material,. FIG. 1 shows the installation, general view; in fig. 2 shows section A-A in FIG. one.

Claims (2)

The installation contains a traction means 1 connected to a heater 2, a heat insulation section 3 heated by exhaust gases from a heater 2 and consisting of several units connected by means of a movable joint. The heater and section 3 are interconnected tightly, and the links of section 3 are made in the form of a frame 4 of an arched structure, covered with sheets of casing 5, fitted with side-mounted slides 6 in contact with the roadway, and are connected by means of sheets of casing 5 with an overlap sufficient to ensure tightness at the highest angle of rotation. The link of section 3 can be easily dismantled and allows to assemble section 3 of any desired length, and when transporting the unit, the links are laid on traction means 1 or on heater 2. The movable connection of links of section 3 is made in the form of a loop 7 of the next link located in the center of the latter. The length of the section heated by the exhaust gases is determined from relationship (1). The installation works as follows. The heater 2 is turned on, the hot gases from which act on the warmed base of the road surface and further, the passage through the arched outlines of the frames 4 of section 3 forming thermal caps, the hot gases continue to give their heat to the base. WITH; The mobility of the traction means 1 is determined depending on the working conditions. So, at an outdoor air temperature of -10 ° C, the depth of warming of the base of the roadway is 5 cm, the average heating temperature is 30 ° C, the installation speed is 50 m / h, which corresponds to the performance of the asphalt concrete plant at 25 t / h and the gases coming out of the section 150 ° C, the length of the section is 13-15 m, and the length of the heater is 0.7-0.9 m. Based on this, the ratio of the length of the heater 2 to the length of section 3 is 1:16:18. After the passage of the last link of section 3, an asphalt-concrete mix is laid on the base, which, due to the heat accumulated by the base, is laid in accordance with the requirements in the conditions of the period of positive temperatures, thus achieving a high quality of the road surface. The invention provides a more efficient use of thermal energy when burning fuel with a uniform heating of the pavement base, which ensures quality work on the installation of asphalt concrete pavement during the period of negative air temperatures and fuel economy. The invention The installation for continuous heating of the base of the pavement, comprising a traction means and a heater and a thermal insulation section of connected links connected in series with it, in order to increase the efficiency of heating and save fuel during negative temperatures, made in the form of thermal caps supported on a skid of an arched outline, and the connection of the heater with the insulation section in the form of a tight articulated joint, the length of the insulation noy section was determined from the dependence J..0, where V - speed setting motion, m / s; h is the depth of the heated base layer, m; a - coefficient of thermal diffusivity of the base material,. Sources of information taken into account in the examination 1. USSR author's certificate number 182757, cl. E 01 C 23/14, 1963. 2. USSR author's certificate number 45621, cl. E 01 C 23/14, 1936.