FI80924C - FOERFARANDE FOER MONTERING AV ETT SKYDDSROER. - Google Patents

Description

and 80924

METHOD OF INSTALLING THE PROTECTIVE PIPE - FÖRFARANDE FÖR MONTERING AV ETT SKYDDSRÖR

The invention relates to a method for installing a protective pipe 5 under an embankment, road or the like below it.

Protective pipes are currently installed through embankments, roads, etc., for example to protect natural gas pipes or other pipes. In connection with the installation of protective pipes, it is known to drill an opening through the embankment and push the protective pipe 10 into the opening, e.g. by means of hydraulic pushing devices. In this case, however, e.g. when installing a protective pipe consisting of shorter concrete pipes, the orientation of the protective pipe is uncertain, and stones or the like in the opening may turn the pipe. In addition, the required thrust forces are high and the concrete pipes can break when pushed into the opening.

It is naturally known to install a protective pipe through an embankment by digging a ditch across the embankment and installing it here. However, breaking the embankment with a ditch is out of the question in many cases, for example due to traffic obstructions, slowness and difficulty of work, etc.

DE 1 811 421 relates to the drilling of a channel through an embankment, after which a protective pipe is drawn into the drilled channel 25 from the opposite side. The problem with such a method is that the walls of the drilled channel can collapse when the soil type is soft or easily collapses. Soil or rock coming off the canal wall can prevent the protective pipe from being pulled and can get stuck.

In the American publication Re. 32,267 discloses a method for drilling an underground curved channel and installing a protective pipe or the like in a drilled channel. The method describes the performance of drilling 35 in successive drilling steps, in which a larger channel is gradually drilled from a small channel, into which a protective pipe is finally drawn. The problem with the described method 2 80924 is that when the protective tube is finally pulled into the channel, it may be blocked due to a collapse or other obstacle.

DE 3 214 033 discloses a method in which an auxiliary pipe with a diameter 5 so large that a man is able to move inside it is first drilled through the soil. The final protective tubes or the like are then assembled inside the auxiliary tube at their destination stations. The drill member is removed from the end of the auxiliary tube and replaced by a cover with tight openings through which the protective tubes pass. The auxiliary tube is then started to be pulled out of the duct, leaving the protective tubes in the duct, into which at the same time the filling material is pressed through the tube inside the auxiliary tube to further fill the duct and surround the protective tubes. The problem with such a method is that it is necessary to use an auxiliary tube with a large diameter in order to assemble the protective tubes inside it. The method is not suitable for the installation of heavy end concrete pipes, because in the method the pipes have to be connected to each other because they are subjected to a tensile load. Furthermore, due to the method, the diameters of the protective tubes are considerably smaller than the diameter of the auxiliary tube surrounding them. Therefore, when the auxiliary pipe is pulled out, the soil may collapse, which may damage the protective pipes and cause them to deform.

It is an object of the present invention to obviate the above drawbacks. In particular, it is an object of the invention to provide a method for installing a protective pipe, in particular a concrete protective pipe, under a bench, road or the like, so that the installation can be carried out quickly and efficiently and so that the protective pipe is accurately obtained.

With regard to the features characteristic of the invention, reference is made to the claims.

In the method of the invention, an opening is drilled through the embankment, and a working pipe is placed in the opening for the installation of the protective pipe and the protective pipe is installed in the opening.

Il 3 80924

According to the invention, the protective tube is pulled into the opening from the working tube so that the protective tube is at the ends with the working tube and the working tube is pulled out of the opening while the protective tube is pulled into the opening.

5 The working tube can be pushed into the opening as the hole drilling progresses, i.e. the hole is drilled through the working tube while pushing the working tube into the formed hole. A protective pipe, e.g. a protective pipe consisting of concrete elements, is suitably pulled into the opening by means of pulling means, such as wire holes, ropes, chains, etc., while the protective pipe is pulled out of the opening. In this case, the formed opening cannot in any way collapse or sink before inserting the protective tube into the opening.

Thanks to the invention, the installation of a protective pipe, e.g. a protective pipe consisting of end-to-end 15 and successively installed concrete pipes, under the embankment, road, etc. under it can be carried out quickly and efficiently. The protective tube cannot be damaged during work. In addition, the protective tube can be mounted exactly at the desired position 20 and in the desired position. If desired, the opening can also be drilled larger than the protective pipe, whereby the protective pipe is very easy and light to pull through the opening, e.g. when pulling the protective pipe out of the lined opening.

The invention will now be described in detail by means of an exemplary embodiment with reference to the accompanying drawing, in which Figures 1 to 4 show step by step the installation of a protective pipe through a road embankment below it.

In Figure 1, the working machine 5 has been driven in front of the road embankment 2, and through the embankment drilling of substantially 30 horizontal openings has begun by means of a drill 10. The drill 10 is operated from the working machine 5, and the operation of the drill is known per se and will not be described in more detail here.

Simultaneously with the bore of the hole, the working tube 4 is pushed into the hole as the bore progresses, i. The opening 35 is drilled through the working pipe while pushing the working pipe through the embankment 2.

In Fig. 2, an opening 3 is drilled through the embankment 2, and at the same time a working pipe 4 is inserted into the opening.

In Fig. 3, the working pipe 4 is pulled out of the opening 3 while the concrete protective pipe element 11 is pulled into the opening by means of traction members 6, such as wires 5, with a traction winch 7; the traction members are connected to the end of the protective tube element by fasteners 8, e.g. fastening hooks. In the embodiment shown in the figure, the working tube 4 leaves the opening 3 while the protective tube element is pulled into the opening with the end of the protective tube element resting against the end of the working tube 10, i.e. the working tube is pulled out by means of .

Figure 4 shows how the protective tube element l1 15 is pulled into the opening 3, and the working tube 4 is pulled out of the opening. After this, a natural gas pipe, for example, can be inserted into the opening.

The diameter of the opening to be drilled in the embankment can be, for example, of the order of 0.5 to 1 m or possibly 20 smaller or larger as required. The diameter of the working tube 4 can be of the same order of magnitude as the opening, i.e. drill diameter; the working pipe may also be smaller than the diameter of the opening, depending on the paints of the embankment, the diameter of the working pipe may also be larger, e.g. 10 - 20 - 30 cm larger than the diameter of the opening or drill. The protective tube, i.e. the diameter of the protective tube elements is generally of the same order of magnitude as the diameter of the working tube, but the diameter of the protective tube can also be somewhat larger or smaller than the diameter of the working tube.

The embodiments are intended to illustrate the invention only, and embodiments of the invention may vary within the scope of the appended claims.

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Claims (4)

A method of mounting a protective tube (1) through a roller (2), a path or the like. during this, an aperture (3) is drilled through the roller, in the aperture a working tube (4) is placed for mounting the protective tube and in the aperture the protective tube, characterized in that the protective tube (1) is retracted into the aperture from the pour of the working tube (4) in such a way that the protective tube 10 is end to end with the working tube and the working tube is pulled out of the opening while the protective tube is pulled into the opening. Method according to claim 1, characterized in that the opening (3) is drilled through the working tube (4). Method according to claim 2, characterized in that the working tube (4) is pushed into the opening (3) with the advancement of the bore. Method according to any one of claims 1 to 3, characterized in that the protective tube (1) is of concrete and it consists of end-to-end positionable concrete pipe x (1). Il