JP2012077462A - Natural ground reinforcing steel pipe and method of producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a natural ground reinforcing steel pipe which can be produced easily and at low cost.SOLUTION: A ring 3 as a separate member is fastened to the circumference of a steel pipe 1 to form a projection strip on the circumference of the steel pipe 1. The projection strip is obtained by forming a concave groove 10 on the circumference of the steel pipe 1 to fit the ring 3 to the concave groove 10 or welding the ring 3 to the steel pipe 1.

Description

  The present invention relates to a steel pipe for reinforcing natural ground for reinforcing natural ground and a method for manufacturing a steel pipe for reinforcing natural ground, and in particular, for reinforcing a soft natural ground by injecting cement milk or the like in excavation such as tunnel construction. The present invention relates to a steel pipe for reinforcing natural ground and a method for producing a steel pipe for reinforcing natural ground.

In general, in order to prevent loosening of the facet (mirror surface) during tunnel excavation work, a steel pipe for reinforcing natural ground is constructed in advance in the direction of excavation of the facet, and cement milk or chemicals are injected from this steel pipe. A mirror reinforcement method that reinforces the face is used. As such a steel pipe for ground reinforcement, a ground reinforcing steel pipe is formed by forming spiral ridges on the outer periphery of the steel pipe by overlay welding and providing a through hole for allowing the injected material to flow out between the ridges. It is disclosed (for example, see Patent Document 1).
Further, there is disclosed a structure in which a protrusion protruding outward from the reinforcing pipe is integrally provided in the vicinity of the discharge hole formed in the reinforcing pipe (see, for example, Patent Document 2).

JP 2006-22501 A JP 2009-249983 A

  As described in Patent Document 1, the method of forming ridges on a steel pipe by overlay welding is high in equipment cost and work cost of a welding device and the like, and as a result, the cost of a steel pipe for reinforcing ground is increased. There was a problem.

  Moreover, since the method of forming the protrusion which protrudes outward of a pipe | tube in the vicinity of a discharge hole as described in patent document 2 needs to provide a protrusion for every discharge hole, many discharge holes If there is, there is a problem that the manufacturing cost becomes high.

  The present invention solves the above-described problems, and an object of the present invention is to provide a natural steel reinforcing steel pipe and a natural steel reinforcing steel pipe manufacturing method that are easy to manufacture and can be produced at low cost.

  In order to achieve the above object, a steel pipe for reinforcing natural ground according to claim 1 is a steel pipe for reinforcing natural ground for reinforcing a natural ground provided with a plurality of protrusions on the outer periphery of the steel pipe. The strip is characterized in that a ring made of another member is fixed to the outer periphery of the steel pipe.

  The steel pipe for reinforcing natural ground according to claim 2 is the steel pipe for reinforcing natural ground according to claim 1, wherein the convex strip is configured by fitting the ring into a concave groove formed on an outer periphery of the steel pipe. It is characterized by being made.

  The steel pipe for reinforcing natural ground according to claim 3 is characterized in that the ring for reinforcing natural steel pipe according to claim 1 or 2 is constituted by an all-around ring continuous to the entire circumference of the steel pipe. To do.

  A steel pipe for reinforcing natural ground according to claim 4 is a steel pipe for reinforcing natural ground according to claim 1 or 2, wherein the ring is an all-around ring continuous to the entire circumference of the steel pipe. It is characterized by being made of an elastic metal material having a cut-off portion formed thereon.

  The steel pipe for reinforcing natural ground according to claim 5 is the steel pipe for reinforcing natural ground according to claim 1 or 2, wherein the ridge is constituted by a split ring formed discontinuously on the outer periphery of the steel pipe. It is characterized by.

  The steel pipe for reinforcing natural ground according to claim 6 is the steel pipe for reinforcing natural ground according to any one of claims 1 to 5, wherein the protrusions are perpendicular or inclined with respect to the center line of the steel pipe. It is structured.

  A steel pipe for reinforcing natural ground according to claim 7 is the steel pipe for reinforcing natural ground according to any one of claims 1 to 6, wherein a protrusion is formed on an inner periphery of the ring, and the protrusion is formed on an outer periphery of the steel pipe. It is characterized by being locked to.

  The steel pipe for earth-and-ground reinforcement according to claim 8, wherein the outer periphery of the steel pipe is formed with a groove at a predetermined interval, and is formed of an elastic metal material having a cut-off portion formed in one place. A natural ground reinforcement characterized by forming a ridge by positioning a ring in the groove in a state of being spread from the cut-off portion and fitting the groove into the groove using the elasticity of the circumferential ring. Steel pipe manufacturing method.

  The steel pipe for reinforcing natural ground according to claim 9 is a steel pipe for reinforcing natural ground characterized by forming a ridge by welding an entire ring or a split ring to the outer periphery of the steel pipe at a predetermined interval. Production method.

  A steel pipe for reinforcing natural ground according to claim 10 is a method for manufacturing a steel pipe for reinforcing natural ground according to claim 9, wherein the all-round ring or the split ring is perpendicular or inclined with respect to the center line of the steel pipe. It is characterized in that the ridge is formed by welding.

  A steel pipe for reinforcing natural ground according to claim 11 is a method of manufacturing a steel pipe for reinforcing natural ground according to any one of claims 8 to 10, wherein a plurality of protrusions are formed on the inner surface of the ring, and the protrusions are formed. It is made to latch on the surface of the said steel pipe.

  A steel pipe for reinforcing natural ground according to claim 12 is a method for manufacturing a steel pipe for reinforcing natural ground according to claim 11, wherein the ring is fixed to the steel pipe by projection welding using the protrusion. To do.

  According to the present invention, the ring of the separate member is fixed to the steel pipe to form the ridge, so that the part cost and the manufacturing cost are reduced, and the steel pipe for reinforcing natural ground can be manufactured at a low cost.

It is a disassembled perspective view which shows 1st Embodiment of the steel pipe for ground reinforcement of this invention. It is a decomposition | disassembly side view of the steel pipe for ground reinforcement of 1st Embodiment. It is a side view of the steel pipe for natural ground reinforcement of 1st Embodiment. (A), (b), (c) is a side view showing the second, third and fourth embodiments of the steel pipe for reinforcing ground according to the present invention, (a1), (b1), (b2). , (C1), (c2), and (c3) are sectional views taken along lines AA, B1-B1, B2-B2, C1-C1, C2-C2, and C3-C3, respectively. It is a perspective view which shows the manufacturing process of the steel pipe for natural ground reinforcement of 2nd Embodiment. (A), (b), (c) is a side view showing fifth, sixth, and seventh embodiments of the steel pipe for reinforcing natural ground according to the present invention, (a1), (b1), (b2). , (C1), (c2), and (c3) are sectional views taken along lines AA, B1-B1, B2-B2, C1-C1, C2-C2, and C3-C3, respectively. It is the side view and sectional drawing which show the process of manufacturing the steel pipe for natural ground reinforcement of 5th Embodiment. It is a front view of 8th Embodiment of the steel pipe for natural ground reinforcement which concerns on this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 show a first embodiment of a natural steel reinforcing steel pipe according to the present invention.
On the outer periphery of the steel pipe 1, a concave groove 10 is formed over the entire circumference at a predetermined interval. The ring 3 is an all-around ring over the entire circumference of the steel pipe 1, and the ring 3 is formed with a cut-off portion 3 a at one place. This ring (all-around ring) 3 has a certain degree of elasticity, and is inserted into the steel pipe 1 in a state where the diameter is slightly expanded, and is returned to the original position at the position of the groove 10, so that the ring 3 is recessed. As shown in FIG. 7, the ridge 2 is formed by elastically fitting to 10. Alternatively, the ring 3 may be twisted to widen the separating portion 3a so as to be directly fitted into the concave groove 10. The ring 3 is fitted and fixed to the concave groove 10 by its elastic force and functions as the ridge 2 without welding, but the fixing force can be strengthened by welding as necessary.

  4 (a) to 4 (c) are second to fourth embodiments of the steel pipe for reinforcing natural ground according to the present invention, which are of the type in which the ridges 2 are welded to the steel pipe 1, and the steel pipe 1 is used. The type formed perpendicularly to the center line is shown.

  In 2nd Embodiment shown to Fig.4 (a), the protruding item | line 2 which consists of the perimeter ring 3A continuous in the perimeter is provided in the outer periphery of the steel pipe 1 at predetermined intervals.

  In the third embodiment shown in FIG. 4 (b), the steel pipe 1 has a predetermined interval on the outer periphery, and is composed of a two-part (half-circumference) ring 3B, which protrudes at a position where the angle is changed by 180 degrees in the circumferential direction. Article 2 is provided.

  In the fourth embodiment shown in FIG. 4C, a predetermined interval is provided on the outer periphery of the steel pipe 1 and the ring 3C is composed of three divided (1/3 round) rings 3C, and the angle is changed by 120 degrees in the circumferential direction. The ridge 2 is provided at the position.

  FIG. 5 shows a manufacturing process of the natural steel reinforcing steel pipe of the second embodiment. An all-around ring 3A that is continuous around the entire circumference made of metal such as iron is created. This all-around ring 3A has an inner diameter that can be inserted into the steel pipe 1 and slide. The entire circumference ring 3A is inserted into the outer circumference of the steel pipe 1, and is slid and welded at a predetermined position (accurate positioning accuracy is not required) to fix the entire circumference ring 3A to the steel pipe 1 as shown in FIG. Convex ridges 2 are formed continuously on the entire circumference as shown in FIG. The all-around ring 3A is not provided with the separation part 3a shown in the first embodiment, but can be provided with the separation part 3a.

  In the natural steel reinforcing steel pipe shown in FIG. 4 (b), a two-part (half circumference) ring 3 </ b> B (hereinafter referred to as a “partition ring”) is welded to a predetermined position of the steel pipe 1. As shown in FIG. 1B, the ridge 2 divided into two parts is formed. In this embodiment, the two-divided ring 3B may not be inserted into the steel pipe 1 and slid.

  In the steel pipe for reinforcing natural ground shown in FIG. 4 (c), a ring 3 </ b> C (hereinafter referred to as a “divided ring”) of three divisions (hereinafter referred to as a division ring) is applied to a predetermined position of the steel pipe 1 and welded. By fixing the split ring 3C, the ridge 2 divided into three as shown in FIG. 4C is formed. In this embodiment, the three-divided ring 3C may not be inserted into the steel pipe 1 and slid.

  FIGS. 6A to 6C are fifth to seventh embodiments of the steel pipe for reinforcing natural ground according to the present invention, in which the ridges 2 are inclined at an arbitrary angle with respect to the center line of the steel pipe 1. The type is shown.

  In 5th Embodiment shown to Fig.6 (a), the ring-shaped protruding item | line 2 'following the whole periphery is inclined and provided in the outer periphery of the steel pipe 1 at predetermined intervals.

  In 6th Embodiment shown in FIG.6 (b), a predetermined space | interval is put on the outer periphery of the steel pipe 1, and it consists of a 2 division | segmentation (half circumference) ring, and a protruding item | line in the position which changed the angle | corner 180 degree | times to the circumferential direction. 2 'is inclined.

  In the seventh embodiment shown in FIG. 6 (c), the steel pipe 1 has a predetermined interval around the outer periphery, and is formed by a three-part (1/3 circumference) ring, and the angle is changed by 120 degrees in the circumferential direction. The ridge 2 'is provided in an inclined manner.

  The ridges 2 'of the fifth to seventh embodiments are the second to second only in that the entire circumference ring, the two-part ring or the three-part ring is inclined (the inclination angle is arbitrary) and welded to the steel pipe 1. Unlike the fourth embodiment, the other configurations are the same as those of the second to fourth embodiments.

  FIGS. 7 (a) and 7 (b) show a process of manufacturing a natural steel reinforcing steel pipe of the fifth embodiment of FIG. 6 (a). In FIG. 7A, the inner diameter of the entire circumference ring 3A is slightly larger than the outer diameter of the steel pipe 1, and after the entire circumference ring 3A is fitted into the steel pipe 1, it is inclined and welded. Moreover, in FIG.7 (b), the inner peripheral surface 4 of the steel pipe 1 is used by using the all-around ring 3A in which the side surface 5 inclines with respect to the inner peripheral surface 4 parallel to the surface of the steel pipe 1 at a predetermined angle. It can be fixed in close contact with the outer periphery.

5 and FIGS. 6A and 6B may have a configuration in which the separation portion 3a as shown in the first embodiment is provided.
Further, in the third, fourth, sixth, and seventh embodiments, the two-division and three-division rings are shown, but the number of divisions is arbitrary, and the number of divisions shown is merely an example.

  FIG. 8 shows an eighth embodiment of a steel pipe for reinforcing natural ground, wherein the ring 3 is an all-around ring having a cut-off portion 3a, and a protrusion 11 is formed on the inner surface of the ring 3 to utilize the elasticity of the ring 3. Then, the protrusion 11 is locked to the steel pipe 1. Since the fixing force is increased by the frictional force between the protrusion 11 and the steel pipe 1, the number of welded portions can be reduced. Further, it is possible to perform projection welding (resistance welding in which a large current flows through the protrusion) using the protrusion 11.

  As described above, according to the steel pipe for reinforcing natural ground and the method for manufacturing the steel pipe for reinforcing natural ground of the present invention, the ridges 2 are formed on the surface of the steel pipe 1 using the rings 3, 3A, 3B, 3C which are separate members. Since it forms, compared with the conventional build-up welding, it becomes possible to reduce both an installation cost and an operation cost.

DESCRIPTION OF SYMBOLS 1 Steel pipe 2, 2 'Convex 3 Ring 3A All-around ring 3B, 3C Split ring 10 Groove 11 Projection

Claims (12)

A steel pipe for ground reinforcement for reinforcing a natural ground, in which a plurality of ridges are provided at intervals on the outer periphery of the steel pipe,
The ridge is a steel pipe for reinforcing natural ground, wherein a ring made of another member is fixed to the outer periphery of the steel pipe.   2. The steel pipe for reinforcing natural ground according to claim 1, wherein the ridge is configured by fitting the ring into a concave groove formed on an outer periphery of the steel pipe.   3. The steel pipe for reinforcing natural ground according to claim 1, wherein the ring is composed of an all-around ring continuous to the entire circumference of the steel pipe.   The ring is an all-around ring continuous to the entire circumference of the steel pipe, and is formed of an elastic metal material having a cut-off portion formed at one location of the all-around ring. The steel pipe for natural ground reinforcement according to claim 1 or 2.   3. A steel pipe for reinforcing natural ground according to claim 1 or 2, wherein the ridge is composed of a split ring formed discontinuously on the outer periphery of the steel pipe.   The steel pipe for reinforcing natural ground according to any one of claims 1 to 5, wherein the protruding line is configured to be perpendicular to or inclined with respect to a center line of the steel pipe.   The steel pipe for reinforcing natural ground according to any one of claims 1 to 6, wherein a protrusion is formed on an inner periphery of the ring, and the protrusion is locked to an outer periphery of the steel pipe.   On the outer periphery of the steel pipe, a concave groove is formed at a predetermined interval, and an all-around ring formed of an elastic metal material in which a cut-off portion is formed in one place is expanded from the cut-off portion. A method of manufacturing a steel pipe for reinforcing natural ground, wherein a convex strip is formed by being positioned in a concave groove and fitting into the concave groove by utilizing the elasticity of the circumferential ring.   A method for producing a steel pipe for reinforcing natural ground, characterized in that a ridge is formed by welding an entire circumference ring or a split ring to the outer circumference of a steel pipe at a predetermined interval.   The method for manufacturing a steel pipe for reinforcing natural ground according to claim 9, wherein the ridges are formed by welding the entire circumference ring or the split ring at a right angle or inclined with respect to the center line of the steel pipe.   The method for manufacturing a steel pipe for reinforcing natural ground according to any one of claims 8 to 10, wherein a plurality of protrusions are formed on the inner surface of the ring, and the protrusions are locked to the surface of the steel pipe. The method of manufacturing a steel pipe for reinforcing natural ground according to claim 11, wherein the ring is fixed to the steel pipe by projection welding using the protrusion.

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