FI92507C - Method and apparatus for controlling pipes laid in 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 uniform soft ground and at such a depth with respect to the ground surface that the cutting arm of the pipeline

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 completed tunnel hole and an attempt is made to change the direction of the tip through the tunnel hole if necessary. In short forcing distances of pipelines, the pipeline is given a sufficiently precise starting direction, in which case the pipeline generally maintains its direction with acceptable accuracy.

When the pipeline has to be forced over longer distances in the horizontal direction of the ground, such as more than 50 meters without intermediate trenches and the ground is soft ground or swamp, currently known methods are not suitable for longer pipelines. If control devices are placed at the tip of the piping that turn the tip when necessary, the weight of the tip will be so high that it will start to sink down in the watery swamp despite the guidance. Steering is also not possible in similar soils, because the pipeline does not receive the necessary support from the surrounding soil for steering. An exact initial trend can be made in Finland and about 50 meters if the weight of the pipeline has been such that the buoyancy does not tend to lift it, nor does its own weight 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-n611e 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 is always visible, forces guiding it in a controlled manner 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 forcing of the piping into the soil. 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 one another are forced one after the other from the starting pit of the soil by means of a known power device (not shown) 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 or clay-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 itself into the soil above the narrow groove pipe. In practice, the forcing depth of the pipe can be estimated to be up to about 2 meters. At the top of the knife part 1 there are fastening parts 3 from which the knife can be lifted, pressed or rotated in order to provide various control functions. The knife can also be raised 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 part, as the plate-like knife part acts like a rudder when moving in the soil.

Figure 2 shows the control 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 a vertical movement of the arm and a small required rotational movement is obtained by means of a working machine. An internal combustion engine driven grater 8 is mounted at the top 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 chain.

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92507 3 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 machine.

Figure 3 is a cross-sectional view of the arm 1, showing its knife-like shape. The shaft must be thin, but it must be able to withstand the forces it transmits to the tip. Other types of profiles with a leading edge are also relevant. The profile can also be hollow, so that things needed in some situations, such as electrical conductors, pressure pipes or pressure-water, can be pulled to the top 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)

1. A method for controlling rudder which is thrust into soft soil and for observing its advancement, in which method rudder (5) is successively coupled to each other and essentially force, which is thrust the rudder, is directed to that rudder (5). which, in turn, is located at the rear, from a thrust force device, which is placed in the starting pit, characterized by, that in connection with the rudder part year, a grounding and progressive ground ridge shaft (1), coupled to the rudder part, (6) ) substantially similar to a knife, which is crowded with said rudder and by the transfer of which shaft forms contact from the earth surface to the tip of the rudder. 2. A method according to claim 1, characterized in that the forward direction of the rudder is breathed by transferring furthest shaft (1), (6) to the rudder tip part forces which deviate the rudder tip (4) from the forward direction. Method according to Claim 1 or 2, characterized in that by rotating the shaft (1), (6) about its vertical axis, the advance of said shaft causes one: course change, which is formed via fastening means (2,7) in the shaft. also as a course change for the tip part (4) in the helm. 92507 Method according to one of the preceding claims 1-3, characterized in that the shaft can be detached from the tip (4) of the tube and feedback in the tip. Method according to any one of the preceding claims 1-4, characterized in that the motor-driven working machine (9) or apparatus (8) is used in the control of the shaft (1), (6) or as a producer of forces or loads which to the shaft. Method according to any one of the preceding claims 1-5, characterized in that, through a duct or the like, formed in the shaft (1,6), pipes or conduits are led to the pipe lying in the ground. Apparatus for realizing the method according to claim 1, which apparatus is a long-shaped, notch with a substantially flat-shaped shank (1,6), in one spirit of which there are fastening means (3) for gripping the shaft and for transferring forces in the shaft. it is characterized in that in the second spirit of the shaft there are fastening means (2, 10) for coupling said shaft in front of the tip of the rudder (5). 8. Device according to claim 8, characterized in that the shaft (1,6) is hollow for conducting various rows or lines via the shaft to the rudder (5) or to its tip part (4). »II