FI92507B - Method and apparatus for guiding pipes forced into the ground - Google Patents

Description

92507

METHOD AND APPARATUS FOR GUIDING GROUND PIPES

The invention relates to a method of guiding a pipeline forced into the ground, in which the pipeline is forced into a soft ground of uniform quality and at such a depth relative to the ground surface that a cutting arm can be guided from the tip to the ground surface to indicate

In tunnel construction, monitoring methods are already known, in which the direction of travel of the tip is monitored from the beginning of the tunnel through the finished tunnel hole and an attempt is made to change the direction of the tip through the tunnel hole if necessary. Short pipeline forcing distances give the pipeline a sufficiently precise starting direction, so that the pipeline usually maintains its direction with acceptable accuracy.

When the pipeline has to be forced into the soil horizontally for longer distances, such as more than 50 meters without intermediate trenches and the soil is soft soil or bog, currently known methods are not suitable for longer pipelines. If control devices are placed at the tip of the piping that turn the tip if necessary, the weight of the tip will become so great that it will start to sink downwards in the watery swamp despite the guidance. Steering is not successful even in bog-like soils, because the piping does not receive the necessary support from the surrounding soil for steering. An exact initial trend can be made in Finland; about 50 meters, if the weight of the piping has been successfully adjusted so that the buoy does not tend to lift it up and its own weight does not tend to push it down.

The method and device according to the invention achieve a decisive improvement in the above-mentioned drawbacks and the invention is characterized by what is stated in the claims.

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The most important advantages of the invention are that the position of the tip of the piping as it progresses can be seen at all times, controlled forces can be applied to the tip and the arm extending to the ground can be temporarily removed if obstacles occur at the arm.

In the following, the invention will be explained in more detail with reference to the drawing, in which

Figure 1 shows the arm-guided piping forcing the soil into the ground. Figure 2 shows the use of machines in control.

Figure 3 shows a cross-section of an arm.

In Fig. 1, pipes 5 welded to each other in succession are forced into the ground from the starting trench (not shown) by means of a known power plant such as a hydraulic cylinder. The front pipe is provided with a tip cone 4, whereby the pipe displaces the soil materials to the side. The soil must be soft, wet clay or bog-like for successful displacement. In front of the tip part 4 there is a second cone 2 to which a knife part 1 extending to the ground surface is attached. Since the soil must be soft, the knife part is able to cut for itself a narrow groove in the soil above the pipe. In practice, the forcing depth of the pipe can be estimated to be up to about 2 meters. The upper end of the knife part 1 has fastening parts 3 from which the knife can be lifted, pressed or rotated to provide various control functions. The knife can also be lifted up from time to time and later pressed down mechanically, whereby the cone parts are connected to each other. Rotating the knife causes a lateral change in the tip portion, as the plate-like knife portion acts like a rudder as it moves in the ground.

Figure 2 shows the control to be performed by means of the working machine 9 via the knife arm 6. The arm 6 is attached to the bucket from the part 3, whereby the working machine provides a vertical movement of the arm and a small required rotational movement. An internal combustion engine driven vibrator 8 is mounted on the upper end of the arm 6, with which: the propagation of the knife and the tip can be considerably improved. The arm 6 is attached at its lower end in this case to the

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3 92507 by means of jun 7 from the arm holder 10 to the tip part 4. In this case, at least the advancement of the arm can be aided by pushing it forward with the aid of the working machine.

Figure 3 is a cross-section of the arm 1, showing its knife-like shape. The shaft must be thin, but it must still be able to withstand the forces it transmits to the tip. Other types of profiles with a sharp leading edge are also relevant. The profile can also be hollow, allowing it to pull things needed in some situations, such as electrical wires, pressure piping, or pressure-water, to reduce friction if the soil is too dry. By means of the pressure piping, a hydraulically rotatable cone screw can be arranged, for example, in front of the tip cone 4, which crushes the soil to be displaced, facilitating the progress.

Claims (8)

92507 A method for guiding and monitoring the progress of pipes forced into soft ground, in which method the pipes (5) are connected in succession and the main pushing force of the pipes is applied to the rearmost pipe (5) from a thrust device located in the starting trench. a substantially knife-like shank (1), (6), emerging and advancing with the front of the pipe, cutting the soil, which is pushed by means of said pipes and through which the shank is connected from the ground to the tip of the piping. Method according to Claim 1, characterized in that the direction of travel of the pipeline is changed by transmitting to the tip of the pipeline through the arm (1), (6) forces which deviate from the direction of travel of the tip (4) of the pipeline. Method according to claim 1 or 2, characterized in that by rotating the arm (1), (6) around its vertical axis, a change in direction is caused for the advancement of said arm, which is also transmitted via the arm fastening members (2,7) as a change in direction of the piping tip (4). ·. Method according to one of the preceding claims 1 to 3, characterized in that the arm can be detached from the tip (4) of the piping and reconnected to the tip. Method according to one of the preceding claims 1 to 4, characterized in that the motor-driven implement (9) or device (8) is used for controlling the arm (1,6) or as a generator of forces or loads applied to the arm. Method according to one of the preceding claims 1 to 5, characterized in that pipelines or conductors are led to the piping in the soil via a channel or the like formed in the arm (1,6). I! 92507 Device for carrying out the method according to claim 1, which device is an elongate substantially flat-shaped arm (1.6) with a cutting edge and fastening means (3) at one end for gripping the arm and transmitting forces thereto, characterized in that the arm end has fastening means ( 2.10) for connecting said arm in front of the tip of the piping (5). Device according to Claim 7, characterized in that the arm (1,6) is hollow for introducing various pipes and conductors through the arm to the piping (5) or to its tip part (4).