초록 ▼

A drain pipe intended for use when laying surface-water drains, manholes and like structures, particularly in frost susceptible ground. The drain pipe has a length such as to enable the pipe to connect a drain cover with a drain-bottom part or a tubular raising member which is connected directly to

A drain pipe intended for use when laying surface-water drains, manholes and like structures, particularly in frost susceptible ground. The drain pipe has a length such as to enable the pipe to connect a drain cover with a drain-bottom part or a tubular raising member which is connected directly to the drain-bottom part or is connected to the drain-bottom part via one or more additional raising members. The outer form of the drain pipe is slightly conical over at least a part of the length of the pipe, the pipe being arranged to be mounted so that its widest end faces downwards and can be inserted into a socket or collar of the aforementioned drain-bottom part or of a raising member. The invention also relates to a method of laying a drain while using such a drain pipe, and to a drain laid in accordance with the method.

대표청구항 ▼

1. A method for laying surface-water drains, manholes and like structures, particularly in ground which is susceptible to frost, wherein said structures are formed of a drain cover at the ground surface, a drain-bottom part and one or more drain pipes extending from the cover to the drain-bottom par

1. A method for laying surface-water drains, manholes and like structures, particularly in ground which is susceptible to frost, wherein said structures are formed of a drain cover at the ground surface, a drain-bottom part and one or more drain pipes extending from the cover to the drain-bottom part, said method comprising the steps of: initially positioning said drain-bottom part within the ground below the frost line, placing a relatively long, upper drain pipe having an outer form which is slightly conical over the extent of said pipe length within the ground, with the pipe turned with its widest end downwards, inserting the end of said conical pipe into a socket of said drain-bottom part to form a telescopic joint between the bottom of said pipe and said drain-bottom part socket while providing a joint guard over the joint to accept the relative movement between the pipe and the underlying stationary drain-bottom part, and wherein the conicity of the pipe is so small that it does not prevent the pipe from accompanying the raising movement of the surrounding ground due to frost, the purpose of the conicity being to facilitate the return of the pipe when the ground thaws. 2. A method according to claim 1, comprising filling the area around the drain with the same kind of substance as that which is present in the surrounding ground. 3. A drain pipe for a surface-water drain, manhole of like structure, particularly in frost susceptible ground, wherein the drain pipe connects to an overlying cover and to an underlying drain-bottom part stationarily positioned within the ground below the frostline; said drain pipe having an outer form which is slightly conical over at least a part of the length of said pipe; said pipe having an extended length so as to extend the full distance from the drain cover to the drain-bottom part below the frostline, said drain pipe having an outer form which is slightly conical over at least a part of the length of said pipe, said pipe is mountable so that its widest end faces downwardly for insertion within a socket of said drain-bottom part, the improvement wherein the conicity of the pipe is so small that it does not prevent the pipe from accompanying the raising movement of the surrounding ground due to frost, the purpose of the conicity being to facilitate the return of the pipe when the ground thaws, and a joint guard mounted over the joint to accept relative movement between the pipe and the underlying drain-bottom part. 4. A drain pipe according to claim 3, which is uniformly conical over the whole of its length; and the conicity of which does not exceed 3 to 4%, and preferably lies within the range of 1-2%. 5. A drain pipe according to claim 3, wherein the lower and/or the upper end part of said pipe is cylindrical and the remaining part is conical, the conicity not exceeding 4 to 5%, and preferably lying within the range of 1-3%. 6. A drain constituting a surface-water drain, manhole or like structure, said drain comprising an upper drain pipe, a drain-bottom part underlying said upper drain pipe and being connected to said drain pipe, said drain pipe being conical over at least a part of the length of said pipe, and said pipe being turned with its widest end downwards said drain-bottom part including a socket receiving the lower end of said drain pipe, the improvement wherein said drain-bottom part is stationarily positioned within said ground below the frostline, said drain pipe is of extended length so as to extend from the ground surface through the portion of the ground susceptible to frost with its lower end below the frostline, the lower end of said drain-bottom part rests in said socket and a joint guard is arranged over the joint between the lower end of said drain pipe and drain drain-bottom part socket, and wherein the conicity of the pipe is so small that it does not prevent the pipe from accompanying the raising movement of the surrounding ground due to frost, the purpose of the conicity being to facilitate the return of the pipe when the ground thaws.