SU1428779A1 - Method of construction of water duct under road embankment on weak foundation - Google Patents

Abstract

The invention relates to the construction of culverts, in particular culverts under the railways and highways. The purpose of the invention is to reduce the laboriousness of erecting the pipe and increase the reliability of its operation. In the lower part of the embankment I, excavation of the weak ground from the low point 5 of the expected precipitation to the depth from the surface of the base 2 was made, determined from the expression hi-max - S, (i horizontal distance from the lowest point of the expected pipe-pipe precipitation curve from the bottom of the slope; - the amount of precipitation of the pipe tray at the lowest point of the expected precipitation curve without excavating weak soil; S ;, - the precipitation of the pipe tray without excavating weak soil at the point with abscissa x; i - transverse slope of the base surface; IHUH on the pipe tray after the sedimentation has stabilized. After removing the weak soil, pipe 3 is laid and dumped out. After pipe draft, tray 9 receives a straight line with a given IMMH slope 2 or €. (L

Description

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The invention relates to the construction of culverts, in particular culverts under the iron and highways.

The aim of the iobre shadow is to reduce the laboriousness of erecting a pipe and increase the reliability of its operation.

FIG. 1 shows the flow pipe to the pipe under the embankment, a longitudinal section, to the dumping; in fig. 2 - the same, after dumping the embankment and stabilization of precipitation.

V The method is carried out as follows.

Under the upper part of embankment 1, at the base 2 section between the inlet end of pipe 3 and vertical straight 4 passing through the lower point 5 of curve 6 of the expected precipitation, the base 2 is excavated under foundation cushion 7 to a depth equal to the thickness hf.n. Foundation bed 7. Under the lower part of the base 1 at the base 2 between the vertical straight A and the outlet end of the pipe 3, the base 2 is excavated under the foundation 7 and the base 2 under the pipe 3 is dredged to a depth h, from mathematical expression

hx s

mlks

 S - (i AMII)

de x

- horizontal distance from the vertical straight line, passing through the lowest point of the curve of the expected draft of the pipe tray, towards the lower slope of the embankment;

SMQKC tray draft

pipes at the lowest point of the expected precipitation j curve without excavating weak soil;

BH - the amount of precipitation tray

pipes without excavation of weak soil at point c. abscis-CQ soy x;

i is the transverse slope of the base surface;

mvn set the slope of the pipe tray after stabilization of precipitation.

At the same time, before or after the excavation of the loose soil, the base 2 arranges a diversion channel 8

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by digging it into the base 2 with a mark near the pipe 3, equal to the mark of the tray 9 at the output end of the pipe 3.

On subgrade bottom 2 through. The bottom of the excavation under the pipe 3 arranges a foundation cushion 7. A pipe 3, such as a metal corrugated one, is placed on the foundation underlayer 7, and the pipe 3 is filled with soil and the embankment 1 is filled.

After filling the embankment 1 under the influence of its weight, the sediment of the pipe 3 occurs on the expected (calculated) values. At the same time, under the upper part of the embankment 1, the tray 9 of the pipe 3 takes a position along curve 6 of the draft with the smallest mark in place of the lowest point 5 of curve 6 of the draft. When constructing a foundation cushion 7 with a building height equal to the deflection arrow of curve 6 of the precipitation in this area, the longitudinal profile of tray 9 of pipe 3 has a straight line with the smallest mark at the same point 5 and with the largest at the inlet end of pipe 3. Under the lower part 1, between the vertical straight 4 passing through the lowest point 5 of the curve 6 of the draft, tray 9, due to its initial position at a depth of hy, gets a straight line with a given IMMH slope and with the greatest mark to the lowest Coy point 5 curve 6 precipitation. However, as before, each point in the tray 9 of the pipe 3 and in the discharge channel 8 is located lower than the previous one, which ensures uninterrupted passage of water through the pipe 3 and after its settlement.

Thus, the method of construction of the culvert construction reduces the laboriousness of its construction by reducing the amount of excavation of the weak ground of the base and eliminating laying instead of its slightly compressible draining soil and simultaneously increasing the reliability of its work during the construction and operation of the structure by ensuring unhindered water passage, eliminating watering base

F, formula of invention

The method of construction of the culvert under the road embankment on a weak foundation, consisting in

31428779

preparing the base for the pipe by excavating weak soil in the lower part of the embankment, laying the pipe and filling the embankment, characterized in that, in order to reduce the labor intensity and increase the reliability of operation, the excavation of the weak soil takes place from the lowest point of the expected precipitation to a depth from the base surface, - Q made from the expression

h; (SMOKC - SK - (i - i-Httn)

where X is the horizontal distance from the lowest point of the expected curve

Q

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precipitation of the pipe tray in the direction of the lower slope of the embankment;

maize trays precipitation

pipes at the lowest point of the expected precipitation curve without excavating weak soil;

S - the amount of precipitation tray

pipes without excavation of weak ground at the point with abscissa x;

i is the transverse slope of the base surface;

ifiiw is the specified slope of the pipe tray after sediment stabilization.

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Claims (1)

Claim A method of constructing a culvert under a road embankment on a weak foundation, consisting of excavation of weak soil is carried out from the lower point of the expected precipitation to a depth from the surface of the base, determined from the expression hx ~ Smokc - S _K - (i - 15 where x is the horizontal distance from the lowest point of the curve of the expected draft of the pipe tray towards the bottom slope of the embankment; “The amount of draft of the pipe chute at the lowest point of the expected draft curve without excavating soft soil; S _x - the amount of draft pipe chute without excavating weak soil at a point with an abscissa x; i 'is the transverse slope of the surface of the base; ifw “preset pipe slope 'of the pipe after stabilization.