JPS6332240Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention relates to a support device for the end of a pipe beam used for supporting underground passages, etc.

PRIOR TECHNOLOGY Pipe beam structure is a type of support used when constructing new underground structures under existing railways, roads, etc., and has been implemented in recent years because it can be constructed without interfering with traffic above. Ivy.

The above-mentioned pipe beam structure connects joints provided along the length of the side of the pipe and pushes a large number of them horizontally and at right angles to the lower part of railways, roads, etc., and then cross beams are installed parallel to each other in advance at both ends. Both ends of the pipe are supported by a pipe beam, mortar is filled in the joint to integrate all the pipes, and the area below the pipe beam is excavated.

By the way, in the pipe beam structure, since the pipes are connected to each other by joints, a load distribution effect occurs through the joints, and it is expected that the rigidity will be improved by 2 to 3 times compared to a structure without joints. However, since the load is transmitted through the joint, twisting force is generated in the support portions at both ends of the pipe, unlike when there is no joint.
As for structures beyond the past, the connecting action of the joints has been ignored in the design, so there has been no consideration given to torsion, and a structure in which the pipes are simply mounted on cross beams has been adopted. However, in reality, a considerably large torsional force is generated in the support portion, and the above-described conventional structure cannot sufficiently restrain the rotation of the pipe, which may cause the pipe to rotate. When the pipe rotates, the joints do not distribute the load, reducing the rigidity of the loading beam and creating the risk of it collapsing due to excessive stress.

Purpose of the invention This invention was developed to address the above-mentioned problems, and provides a sufficiently rigid structure that can be easily constructed on site to restrain the rotation of the pipe due to the torsional force acting on the pipe beam support. There is a particular thing.

Structure of the invention The structure of the pipe beam end support device according to the invention is such that a plurality of rotary block projections are formed on the outer peripheral surface of the lower side of the pipe end, and a plurality of said pipes are laterally connected by a joint. The pipe is installed on a cross beam, and the gap between the pipe and the cross beam is filled with mortar so as to bury the rotation prevention protrusion.

Embodiment An embodiment of this invention will be described with reference to the drawings.A pipe 1 to be used has female and male joints 2 and 3 formed on both outer surfaces thereof, which can be engaged with each other in the longitudinal direction. Further, a plurality of rotation preventing protrusions 4 are provided on the outer circumferential surface of the lower end of the pipe so as to protrude in the longitudinal direction.

The rotation blocking protrusions 4 are attached by welding reinforcing bars having a length of, for example, about 1.5D (D: the outer diameter of the pipe 1) in parallel at a predetermined interval in the longitudinal direction. If necessary, the ends of the reinforcing bars are made sharp to reduce resistance during pushing. The rotation blocking protrusion 4 may also be formed by welding a flat steel, a small diameter pipe, an angle, etc. to the pipe 1.

A large number of the above-mentioned pipes 1 are sequentially pushed into the ground below railways, roads, etc. on the cross beams 5 while engaging the joints 2 and 3. When the pushing is completed, the gap between the joints 2 and 3 is filled with mortar. Next, the end of the pipe 1 is fixed by filling the gap between the pipe 1 and the cross beam 5 with mortar or mortar 6 such as concrete so as to bury the rotation preventing projection 4. The ground below pipe 1 is excavated as described above.

Effects of the invention This invention has the above-mentioned structure, and a plurality of rotation-preventing protrusions are formed on the outer peripheral surface of the lower end of each pipe constituting the pipe beam, and each of the rotation-preventing protrusions is embedded in the pipe beam. Since the gap between the pipes and the cross beams is filled with mortar, each pipe is connected to each other even under wheel loads, and the structure has sufficient resistance to rotation, so the load is not transmitted in the lateral direction. Since it supports the load as a whole, it can be expected to improve strength and rigidity. Further, the rotation-blocking protrusion can be easily manufactured by welding reinforcing bars, etc., and since the cross-section of the rotation-blocking protrusion is relatively small, it does not pose any particular problem when pushing the pipe or transporting it. Furthermore, the construction is simple, as all that is required on site is to pour mortar, concrete, etc. into the gap between the pipe and the cross beam.

[Brief explanation of drawings]

Figures 1 and 2 are sectional views showing an overview of the pipe beam structure, Figure 3 is an explanatory diagram of the rotational action, Figure 4 is a perspective view of the end of the pipe, and Figure 5 is a sectional view of an embodiment. be. 1...Pipe, 2, 3...Joint, 4...Rotation prevention protrusion, 5...Horizontal beam, 6...Mortar.

Claims (1)

[Scope of utility model registration request] A pipe beam end support device characterized in that a plurality of anti-rotation protrusions are formed on the lower outer peripheral surface of the pipe end, a large number of the pipes are connected horizontally with joints and installed on a cross beam, and mortar or the like is filled in the gap between the pipe and the cross beam so as to bury the anti-rotation protrusions.