JP4656605B2 - Load bearing material - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a load-bearing material suitable for a protective fence, a road bridge, a sign, a street light, and other structural components, piles that prevent collapsed earth and landslides, and the like that catch snow and rock fall.

  Conventionally, protective fences have been known that are constructed on slopes of mountainsides to prevent falling or inflowing on roads etc. by receiving falling rocks and snow, etc.For example, vertical holes are provided at intervals on slopes of mountainsides. There has been proposed a protective fence such as a falling rock (for example, Patent Document 1) in which pipe struts that are drilled and installed in the vertical holes are arranged side by side, and a wire mesh is stretched together with a plurality of cables on each of the pipe struts. .

  As materials for the struts used for such rockfall and avalanche protection structures, steel pipes with open ends, bearing plates placed at both ends of the steel pipe, and axially housed in the steel pipe, both ends to the bearing plate There has been proposed a load-bearing material (for example, Patent Document 2) made up of a fixed ampound type steel wire or steel bar and concrete filled in a steel pipe. In this load bearing material, tension force is not introduced into the reinforcing material, and when the load bearing material is deformed, the tension side reinforcing material is stretched. Patent Document 2 describes that the PC steel rod can prevent the concrete from coming out and the bending strength can be increased by reinforcement, and an uncoil type PC steel rod is used as the reinforcing material. . The strut is a rigid member manufactured by placing an uncoil type PC steel material covered with a sheath material in a steel pipe and filling the steel pipe with concrete. PC steel is arranged on the tension side of the column, and tension is not introduced at the time of manufacturing each PC steel, so that both ends are fixed, and when bending force acts on the column, tension is introduced into the PC steel (For example, Patent Document 3). The thing of this patent document 3 generate | occur | produces tension | tensile_strength in this PC steel, when bending stress is added, without providing tension | tensile_strength to PC steel with respect to the prior art example which gave the prestress stress by PC steel. By configuring as described above, the strength is improved. However, since all of these materials use PC steel, etc., there is a problem that the material cost and the production cost are increased as compared with general rebar.

Moreover, although it is different from this type of protection structure such as rock fall and avalanche, there is a concrete structural member in which a tensile material is tensioned and a presto is introduced in the axial direction from the bearing plate to the concrete (for example, Patent Document 4), In this structural member, a constraining member having a closed cross-sectional shape, concrete filled in the constraining member, a bearing plate that is in close contact with both end surfaces of the concrete, sandwiching the concrete, and passing through both supporting plates are axially inserted into the concrete. The tension material and the restraining member are used as tension material, compression material, or bending material by bearing the tensile force independently, and the concrete bearing the compression force independently. is there. And it is described that the restraint member is doubly arranged, and the compressive strength and toughness are increased by combining concrete and restraint material. However, in order to introduce prestress, as described above, a PC steel bar or the like, which requires material costs and production costs, is required, and as shown in FIG. Because the structure is filled with concrete in the gap and the inner restraint member, the concrete must be filled after positioning the inner and outer restraint members, and the positioning work is expected to be complicated and expensive to manufacture. Is done.
JP-A-7-197423 JP-A-6-146225 JP 7-26519 A JP-A-7-62792

  Accordingly, an object of the present invention is to provide a load-bearing material that is relatively inexpensive, improves strength against load, and is easy to manufacture.

The invention of claim 1 includes an outer steel pipe, an inner steel pipe disposed in the outer steel pipe, a reinforcing steel rod disposed between the outer steel pipe and the inner steel pipe, and the outer steel pipe and the inner steel pipe. The reinforcing steel rod has a flat portion that is continuous in the length direction on both sides, and the flat portion is fixed to the inner surface of the outer steel pipe or the outer surface of the inner steel pipe .

  According to a second aspect of the present invention, the reinforcing steel bar has irregularities on the outer periphery.

According to a third aspect of the present invention, the inner steel pipe is filled with a filler.

According to the invention of claim 4, an inner steel pipe is disposed in the outer steel pipe, and reinforcing steel bars having flat portions on both sides are disposed between the outer steel pipe and the inner steel pipe. A load-bearing material manufacturing method for filling a filler between an inner steel pipe and the outer steel pipe after fixing the flat portions of the three or more reinforcing steel bars to the inner surface of the outer steel pipe or the outer surface of the inner steel pipe. In this method, the inner steel pipe is inserted into the steel pipe.

  According to the configuration of the first aspect, the filler is restrained by the outer and inner steel pipes, the compressive stress is improved, and the reinforcing steel rod between the outer and inner steel pipes is set as the tensile region side, thereby reinforcing the reinforcement. The steel bar resists the tensile force caused by bending, and the tensile stress on the tensile region side is improved, so that the stress against the load can be effectively improved. In addition, a load-bearing material can be easily configured by combining a steel pipe and a steel bar. it can.

  Moreover, according to the structure of Claim 2, the adhesiveness of a reinforcing steel bar and a filler improves by the unevenness | corrugation of an outer surface, and a reinforcing steel bar and a filler are integrated.

Moreover, according to the structure of Claim 1 , it becomes easy to fix to a steel pipe using a plane part, and a plane part contacts a steel pipe by a surface, and the insertion operation | work of the inner side steel pipe to the outer side steel pipe at the time of manufacture is easy. Become.

Moreover, according to the structure of Claim 3 , compressive stress improves with the filler with which the inner side steel pipe was filled.

According to the configuration of the fourth aspect , the reinforcing steel rods serve as spacers for the outer and inner steel pipes, and it is easy to insert and arrange the inner steel pipes in the outer steel pipes and align them in the cross-sectional direction, thereby simplifying the manufacturing process. In addition, the flat part can be easily fixed to the steel pipe, and the flat part can be in contact with the steel pipe at the surface, so that the inner steel pipe can be easily inserted into the outer steel pipe at the time of manufacture.

  Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below do not limit the contents of the present invention described in the claims. In addition, all of the configurations described below are not necessarily essential requirements of the present invention. In each embodiment, by using a load bearing material different from the conventional one, an unconventional load bearing material and its manufacturing method can be obtained, and the load bearing material and its manufacturing method will be described respectively.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 5 show a first embodiment of the present invention. As shown in FIG. 1, a load bearing material 1 has an inner steel pipe 3 with a circular cross section inserted and arranged at intervals in an outer steel pipe 2 with a circular cross section. A plurality of reinforcing steel bars 4 are arranged between the outer steel pipe 2 and the inner steel pipe 3, and no shrinkage is caused in the outer filling space 5 between the outer steel pipe 2 and the inner steel pipe 3 in which the reinforcing steel bars 4 are arranged. A filling material 6 such as mortar is filled, and the inside filling space 7 inside the inside steel pipe 3 is also filled and cured.

  The reinforcing steel bar 4 is a deformed steel bar, and has a trapezoidal screw portion 11 as a concavo-convex shape on the outer periphery thereof in the entire length direction. Further, on the outer periphery of the reinforcing steel rod 4, flat portions 12, 12 that are continuous in the length direction are provided on both sides of the cross section, and the trapezoidal screw portion 11 is cut off on the flat portion 12, The plane portions 12 and 12 are parallel. The reinforcing steel rod 4 is provided continuously in the length direction of the steel pipes 2 and 3, and the length is also substantially the same.

  The interval between the flat portions 12 and 12 of the reinforcing steel rod 4 is set slightly narrower than the interval between the inner surface of the outer steel pipe 2 and the outer surface of the inner steel pipe 3. Three or more reinforcing steel bars 4 are arranged in the outer filling space 5, and in this example, four reinforcing steel bars 4, 4A, 4A, 4A are arranged in the outer filling space 5 at equal intervals in the circumferential direction. And the adjacent reinforcing steel bars 4, 4A, 4A, 4A are at a position forming an angle of 90 degrees in the circumferential direction. The reinforcing steel bar 4A has the same configuration as the reinforcing steel bar 4 except that the arrangement position is different. Further, the reinforcing steel rods 4, 4 are arranged next to the reinforcing steel rod 4, and the three reinforcing steel rods 4, 4, 4 are arranged at an angle of 30 degrees in the circumferential direction.

  Next, the manufacturing method of the load bearing material 1 will be described. First, the reinforcing steel rods 4, 4, 4, 4A, 4A, 4A are fixed to the outer surface of the inner steel pipe 3. In this case, one flat surface portion 12 is fixed along the outer surface of the inner steel pipe 3 by welding or the like. In this way, the inner steel pipe 3 to which the reinforcing steel bars 4, 4, 4, 4A, 4A, 4A are fixed is inserted into the outer steel pipe 2. In this case, the inner steel pipe 3 inserts the inner steel pipe 3 into the outer steel pipe 2 with the flat portions 12 of the plurality of reinforcing steel bars 4, 4, 4, 4 A, 4 A, 4 A along the inner surface of the outer steel pipe 2. be able to. And after insertion, the one end side of the steel pipes 2 and 3 is arrange | positioned upwards, the filling material 6 is filled into the outer filling space 5 and the inner filling space 7 from the opening of the upper side, and the load bearing material 1 is cured. Is obtained. In addition, you may give plating processing, such as zinc, to the load-bearing material 1 before filling a filler.

  4 and 5 show an example of use of the load-bearing material 1. In FIG. 4, the load-bearing material 1 is used as the support fence 101 for receiving avalanches and falling rocks, and a plurality of load-bearing materials 1, 1. The protective surface 103 which catches avalanches, falling rocks, etc. is formed by extending a wire mesh 102 between these load-bearing materials 1, 1. The reinforcing steel rods 4, 4 and 4 are arranged on the tensile region side when a force to bend the load bearing material 1 is applied by receiving avalanches or falling rocks. Specifically, when the load-bearing material 1 falls down later, the load-bearing material 1 is provided so that the reinforcing steel rods 4, 4, 4 are positioned on the tensile region side on the cross-sectional front side of the load-bearing material 1. In FIG. 5, the load bearing material 1 is used as a landslide deterrent pile or the like. The load bearing material 1 serving as the deterrent pile is driven into the moving layer 111 and the lower portion is driven into the immobile layer 112.

Thus, in this embodiment, the outer steel pipe 2, the inner steel pipe 3 disposed in the outer steel pipe 2, the reinforcing steel rod 4 disposed between the outer steel pipe 2 and the inner steel pipe 3, and the outer steel pipes. 2 and the inner steel pipe 3 are filled with a filler 6, and the reinforcing steel rod 4 has flat portions 12 and 12 which are continuous in the length direction on both sides, and the flat portions 12 and 12 are provided on the outer steel pipe 2. of from to affix the inner or outer surface of the inner steel tube 3 is restrained filling material 6 by the outer and inner steel pipe 2, and improves compressive stress, the reinforcing steel is between outer and inner steel pipe 2,3 By making the rods 4, 4, and 4 on the tensile region side, the reinforcing steel rods 4, 4, and 4 improve the tensile stress on the tensile region side against the tensile force caused by bending, effectively reducing the stress against the load. In addition, the load-bearing material 1 can be simply configured by combining the steel pipes 2 and 3 and the steel rods 4, 4 and 4. That. In addition, it is easy to fix to the steel pipes 2 and 3 using the flat portions 12 and 12 and the flat portion 12 is in contact with the steel pipes 2 and 3 by the surface, and the inner steel pipe 3 is inserted into the outer steel pipe 2 at the time of manufacture. Becomes easy.

  Further, in this embodiment, since the reinforcing steel bar 4 has the trapezoidal screw part 11 that is uneven on the outer periphery, the adhesiveness between the reinforcing steel bar 4 and the filler 6 is improved by the trapezoidal screw part 11, and the reinforcing steel bar 4 is reinforced. The steel bar 4 and the filler 6 can be integrated.

  In this way, in this embodiment, since the inner steel pipe 3 is filled with the filler 6, the compressive stress is improved by the filler 6 filled in the inner steel pipe 3.

As described above, in this embodiment, the inner steel pipe 2 is disposed in the outer steel pipe 3, and the reinforcement having the flat portions 12, 12 that are continuous in the length direction between the outer steel pipe 2 and the inner steel pipe 3 on both sides. A method of manufacturing a load-bearing material 1 in which steel rods 4 and 4A are arranged and a filler 6 is filled between the outer steel pipe 2 and the inner steel pipe 3, and 3 on the inner surface of the outer steel pipe 2 or the outer surface of the inner steel pipe 3. Since the inner steel pipe 3 is inserted into the outer steel pipe 2 after the flat portion 12 of the reinforcing steel bars 4 and 4A is fixed, the reinforcing steel bars 4 and 4A serve as spacers for the outer and inner steel pipes. The insertion arrangement of the inner steel pipe 3 and the alignment in the cross-sectional direction are facilitated, and the manufacturing process can be simplified. Here, the number of reinforcing steel rods 4 and 4A is three or more. If the inner steel pipe 3 is supported and positioned by the reinforcing steel rods 4 and 4A, there are three or more reinforcing steel rods 4 and 4A. This is because the three reinforcing steel bars 4, 4A, 4A can be positioned at a position that forms an angle of 120 degrees in the circumferential direction. In addition, it is easy to fix to the steel pipes 2 and 3 using the flat portions 12 and 12 and the flat portion 12 is in contact with the steel pipes 2 and 3 by the surface, and the inner steel pipe 3 is inserted into the outer steel pipe 2 at the time of manufacture. Becomes easy.

  In addition, as an effect of the embodiment, since the four reinforcing steel bars 4, 4A, 4A, 4A are arranged at a position that forms an angle of 90 degrees in the circumferential direction, the steel pipes 2, 3 can be reliably positioned. Can do.

  FIG. 6 shows a second embodiment of the present invention. The same reference numerals are given to the same portions as those in the first embodiment, and detailed description thereof is omitted. In this example, first, the inner surface of the outer steel pipe 2 is first described. Further, the reinforcing steel bars 4, 4, 4, 4A, 4A, 4A are fixed. In this case, one flat surface portion 12 is set along the inner surface of the outer steel pipe 2 and is fixed by welding or the like within a range where the welding rod reaches from both end openings of the outer steel pipe 2. In this way, after the reinforcing steel bars 4, 4, 4, 4 A, 4 A, and 4 A are fixed to the outer steel pipe 2, the inner steel pipe 3 is inserted into the outer steel pipe 2. In this case, the inner steel pipe 3 can be inserted in a positioned state along the flat surface portions 12 of the plurality of reinforcing steel bars 4, 4, 4, 4A, 4A, 4A.

  Thus, also in the present embodiment, the same operations and effects as in the first embodiment are obtained.

  FIGS. 7-8 shows Example 3 of this invention, attaches | subjects the same code | symbol to the same part as the said Example 1, and abbreviate | omits the detailed description, In this example, the said inner side steel pipe 3 is described. The reinforcing body 20 is inserted and arranged inside and fixed to the inner steel pipe 3, and then the inside is filled with the filler 6 and cured. The reinforcing body 20 has three reinforcing ribs 21, 21, 21 made of a plate material arranged in a substantially equilateral triangle, and strip steel plates 22, 22, 22 on tops 21 S, 21 S, 21 S of the reinforcing ribs 21, 21, 21. It is made by welding. Further, the width W of the strip-shaped steel plate 22 is at least twice the thickness T of the reinforcing rib 21. Further, the strip-shaped steel plates 22, 22, 22 of the reinforcing body 20 are attached so as to be able to be inserted through the inner surface of the inner steel pipe 3 through a slight gap. At the time of manufacture, after assembling the reinforcing body 20, the reinforcing body 20 is inserted and arranged from one side opening of the inner steel pipe 3, and the reinforcing body 20 is welded and fixed to the inner surface of the inner steel pipe 3 on the opening side where the welding rods reach. After that, the filler 6 is filled inside. Further, as shown in FIG. 8, the end portion of the reinforcing rib 21 is fixed to the belt-shaped steel plate 22 by the welded portion 23. One of the reinforcing ribs 21, 21, and 21 is located on the side of the reinforcing steel rods 4, 4, and 4 that will be a tensile region when a load is applied, and one apex 21S is located on the compression region side.

  As described above, this embodiment also has the same operations and effects as the above embodiments.

  Also, in this example, reinforcing ribs 21, 21, and 21 having a triangular cross section are inscribed inside the inner steel pipe 3 having a circular cross section, and two vertices 21S of the reinforcing ribs 21, 21, and 21 are provided as tensile regions of the steel pipe. Since it is arranged on the side, the non-shrinking mortar constituting the filler 6 which is the cement mixture inside is constrained by the reinforcing ribs 21, 21, 21 inside the steel pipe 2 and the compressive stress is improved, and the tensile region side Since there is a rib 21 that connects the two vertices 21S and 21S of the reinforcing ribs 21 and 21, this improves the tensile stress on the tensile region side against the tensile force caused by bending, effectively improving the stress against the load can do.

  As mentioned above, although the Example of this invention was explained in full detail, this invention is not limited to the said Example, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, the number and arrangement of reinforcing steel bars can be selected as appropriate. Further, the unevenness of the reinforcing steel rod may be not only the screw-shaped one shown in the embodiment, but also unevenness due to the longitudinal protrusions, etc. If the adhesion between the reinforcing steel rod and the filler can be improved, various unevennesses are possible. Can be used.

It is sectional drawing of the load bearing material which shows Example 1 of this invention. It is sectional drawing of the outer side steel pipe which fixed the reinforcement steel rod same as the above. FIG. 3 (A) is a front view, and FIG. 3 (B) is a side view. It is a front view of the protection fence which used the load-bearing material for the support | pillar as above. Same as above, when load-bearing material is used for landslide prevention pile, Fig. 5 (A) is a cross-sectional view with landslide prevention pile provided on the valley side of moving layer, Fig. 5 (B) is landslide prevention pile on the mountain side of moving layer FIG. It is sectional drawing of the inner side steel pipe which fixed the reinforcing steel rod which shows Example 2 of this invention. It is sectional drawing of the load bearing material which shows Example 3 of this invention. It is sectional drawing of the principal part of a reinforcement body same as the above.

DESCRIPTION OF SYMBOLS 1 Load-bearing material 2 Outer steel pipe 3 Inner steel pipe 4, 4A Reinforced steel rod 6 Non-shrink mortar
12 Plane section

Claims (4)

An outer steel pipe, an inner steel pipe disposed in the outer steel pipe, a reinforcing steel rod disposed between the outer steel pipe and the inner steel pipe, and a filler filled between the outer steel pipe and the inner steel pipe. The reinforcing steel rod has a flat portion continuous in the length direction on both sides, and the flat portion is fixed to the inner surface of the outer steel pipe or the outer surface of the inner steel pipe . The load-bearing material according to claim 1, wherein the reinforcing steel bar has irregularities on an outer periphery. The load-bearing material according to claim 1 or 2 , wherein the inner steel pipe is filled with a filler. An inner steel pipe is arranged in the outer steel pipe, and reinforcing steel bars having flat portions on both sides in the length direction are arranged between the outer steel pipe and the inner steel pipe, and filling is performed between the outer steel pipe and the inner steel pipe. A method of manufacturing a load-bearing material that is filled with a material, wherein the flat portion of three or more reinforcing steel bars is fixed to the inner surface of the outer steel pipe or the outer surface of the inner steel pipe, and then the inner steel pipe is placed in the outer steel pipe. A method for producing a load-bearing material, which is characterized by being inserted.

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