JP2002266321A - Grouted steel pipe for rock fall/snowslide or the like protective structure and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grouted steel pipe for rock fall/snowslide or the like protective structure and its manufacturing method capable of increasing strength against load of rock fall/snowslide or the like. SOLUTION: Reinforcing ribs 11, 11 and 11 having a triangular section are provided to the inside of the steel pipe having a circular section by internally connection to each other and, at the same time, two summits of the reinforcing ribs 11, 11 and 11 are arranged on a tension area side of the steel pipe 2. An inside shrinkage compensating mortar 4 is confined in the section by the reinforcing rigs 11, 11 and 11 inside of the steel pipe 2, compressive stress is increased, and since there are the rib 11 for connecting two summits 11S and 11S of the reinforcing ribs 11 and 11 on the tension area side, tensile stress on the tension area side is increased against tensile force occurring by bending the rib to enable stress against load to efficiently increase.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filled steel pipe used for a column or a beam of a rock fall / avalanche protection structure and a method of manufacturing the same.

[0002]

As a protection fence which is a protection structure for falling rocks and avalanches, for example, JP-A-7-197423.
In the official gazette, vertical holes are drilled at intervals on the slope of the hillside,
Along with the pipe supports built in this vertical hole,
Some of these pipe supports are provided with wire mesh along with a plurality of stages of cables.

[0003] As a material used for a rock fall / avalanche protection structure, Japanese Patent Application Laid-Open No. 6-146225 discloses a steel pipe having both ends opened, a supporting plate disposed at both ends of the steel pipe, and an axial direction inside the steel pipe. A load-bearing material (claims) comprising an unpound-type steel wire or a steel rod whose both ends are fixed to the supporting plate and concrete filled in a steel pipe has been proposed. In this case, when the tension is not introduced into the reinforcing member and the load-bearing material is deformed, the reinforcing member on the tension side is stretched, so that the tension is first introduced at this point (Japanese Patent Publication No. 0007). And it is described that the concrete steel can be prevented from coming out by the PC steel rod and the bending strength can be increased by reinforcement (Japanese Patent No. 0017).
An unpound type PC steel rod is used as a reinforcing material. In Japanese Patent Application Laid-Open No. Hei 7-26519, a support is a rigid member manufactured by placing an unpound type PC steel material covered with a sheath material in a steel pipe and filling the steel pipe with concrete. The PC steel material is arranged on the tension side of the column, and each PC steel material is fixed at both ends without introducing tension during manufacture, and tension is introduced into the PC steel when a bending force acts on the column. (Publication No. 0013).

[0004] In the above-mentioned structure, when a bending stress is applied without giving a tension to the PC steel material, a tension is generated in the PC steel material in comparison with the conventional example in which the PC steel material is prestressed. , The strength is improved. However, all of these use unpound-type PC steel or the like, so that there is a problem that the material cost and the manufacturing cost are higher than those of general rebar.

[0005] In addition, although different from this kind of protection structure such as falling rocks and avalanches, Japanese Patent Application Laid-Open No. 7-62792 discloses that tension material is tensioned and axial prestress is introduced from the bearing plate into concrete. (Claim 3 of the Claims) There is a concrete structural member. In this structural member, a restraining member having a closed cross-sectional shape, concrete to be filled in the restraining member, and both end faces of the concrete, Consists of a support plate that sandwiches concrete, and a tension member that penetrates both support plates and is placed in the concrete in the axial direction. The tension member and the restraining member bear the tensile force, and the concrete bears the compressive force independently. By doing so, it is used as a tensile material or a compression material, or as a bending material (Japanese Patent Publication No. 0014). It is described that the restraining members are arranged in a double manner (JP-A 0016), and the combination of concrete and the restraining members increases the compressive strength and toughness (JP-A 0032). But,
In order to introduce prestress, a PC steel rod, which requires material and production costs as described above, is required. In addition, as shown in FIG. And since it is a structure in which concrete is filled in the inner restraint member, concrete must be filled after positioning the inner and outer restraint members, and the positioning work becomes complicated, and it is expected that manufacturing cost will increase. You.

Accordingly, the present invention is to provide a filled steel pipe for a protection structure such as a rockfall or avalanche which can be made relatively inexpensive and can improve the strength against loads such as a rockfall or an avalanche, and a method of manufacturing the same. In addition, it is another object of the present invention to provide a filled steel pipe for protection structures such as falling rocks and avalanches that can be easily manufactured and reduce the manufacturing cost, and a method for manufacturing the same.

[0007]

According to the first aspect of the present invention, there is provided a filled steel pipe for a falling structure, an avalanche or the like for a protection structure in which a steel pipe is filled with a mixed material in which cement is mixed. A triangular reinforcing rib is provided so as to be inscribed therein, and two vertices of the reinforcing rib are arranged on a tensile region side of the steel pipe.

According to the structure of the first aspect, the reinforcing ribs inside the steel pipe restrain the cement mixed material inside in the cross section, improve the compressive stress, and connect the two vertices of the reinforcing rib to the tensile region side. Since the rib is provided, the tensile stress in the tensile region side is improved against the tensile force generated by the bending, and the stress to the load can be effectively improved.

A second aspect of the present invention is a filled steel pipe for a rock fall, avalanche or other protection structure in which a steel pipe is filled with a cement-mixed material. And a plurality of these reinforcing bars are provided on the tensile region side of the steel pipe.

According to the structure of the second aspect, the rebar provided on the tensile region side inside the steel pipe improves the tensile stress on the tensile region side against the tensile force generated by bending, and improves the stress against load. The reinforcing bars on the side of the plurality of tensile regions can be provided in close contact with the cement mixture, and can be inexpensive and cost-effective as compared with steel materials that introduce prestress.

According to a third aspect of the present invention, a plurality of longitudinal reinforcing bars are provided inside a steel pipe having a circular cross section, and the plurality of reinforcing bars are provided on the tensile region side of the steel pipe.

According to the third aspect of the present invention, the reinforcing ribs inside the steel pipe restrain the cement mixture inside the steel pipe in cross section, improve the compressive stress, and connect the two vertices of the reinforcing rib to the tensile region side. Since the rib and the plurality of reinforcing bars are provided, the tensile stress in the tensile region side is improved against the tensile force generated by the bending, and the stress to the load can be effectively improved.

Further, according to a fourth aspect of the present invention, the reinforcing bar is provided in contact with an inner surface of the steel pipe.

According to this structure, the reinforcing steel provided in contact with the inner surface is integrated with the steel pipe and resists the tensile force generated by bending, so that the load-bearing performance can be effectively improved. it can.

Further, according to the invention of claim 5, a strip-shaped steel sheet having a width of at least twice the thickness of the reinforcing rib is fixed to the top of the reinforcing rib, and the strip-shaped steel sheet is fixed to the inner surface of the steel pipe. Things.

According to the fifth aspect of the present invention, the provision of the strip-shaped steel plate at the apex facilitates the connection of the reinforcing ribs at the apex and improves the bonding strength.

According to a sixth aspect of the present invention, there is provided a method of manufacturing a concrete-filled steel pipe for protection structures such as falling rocks and avalanches in which a mixed material obtained by mixing cement is filled into a steel pipe. After forming a reinforcing body to which a strip-shaped steel sheet having a width of about twice or more of the thickness of the steel pipe is fixed, the reinforcing body is inserted from one side opening of the steel pipe, and the reinforcing body is fixed to the inner surface of the steel pipe, This is a manufacturing method of filling the mixed material into a steel pipe.

According to the structure of claim 6, the reinforcing body is
The provision of the strip-shaped steel plate at the apex facilitates the connection of the reinforcing ribs at the apex and improves the bonding strength. The thus assembled reinforcing body is inserted into the steel pipe and fixed to the inner surface of the steel pipe. In this case, the cement mixture can be filled as it is without any displacement of the reinforcing member, and the production becomes extremely simple.

According to a seventh aspect of the present invention, there is provided a method for manufacturing a filled steel pipe for a protection structure such as a rock fall or an avalanche in which a mixed material in which cement is mixed is filled in a steel pipe. After forming a reinforcing body having an end plate having an arc edge corresponding to the inner surface of the steel pipe fixed to both ends of the reinforcing bar, the reinforcing body is inserted from one side opening of the steel pipe, and the reinforcing body is fixed to the steel pipe. And then filling the mixed material into the steel pipe.

According to the structure of claim 7, the reinforcing body is
Since the both ends of the multiple reinforcing bars are fixed by end plates, the reinforcing bars etc. are integrated without moving, the reinforcing body is inserted into the steel pipe, and the reinforcing body is connected to the steel pipe near one side opening. If it is fixed, the cement mixture can be filled as it is without displacement of the reinforcing bar, and the production becomes extremely simple.

The invention according to claim 8 is a manufacturing method wherein the filled steel pipe is used for a column, and the reinforcing member has a length from a lower end of the filled steel pipe to a position less than one half of a ground part. .

According to the eighth aspect of the present invention, when a filled steel pipe is used as a column, when a load is applied, a maximum bending stress is generated at the ground surface position. There is no need to insert the body, and since the reinforcing body of the present invention is self-supporting itself, it can be smoothly filled with the cement mixed material even if it is fixed to the steel pipe by welding or the like only at one opening side without being inserted into the entire length. Therefore, as compared with the case where the reinforcing member is inserted into the entire length, the material load can be further reduced, and the load resistance required for the column can be obtained.

[0023]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIGS. 1 to 8 show a first embodiment of the present invention. As shown in FIG. 1, a filled steel pipe 1 is obtained by inserting a reinforcing member 3 into a steel pipe 2 having a circular cross section and fixing it to the steel pipe 2. The inside is filled with non-shrink mortar 4 and cured. The reinforcing member 3 includes three reinforcing ribs made of a plate material.
11, 11, 11 are arranged in a substantially equilateral triangle, and the reinforcing ribs 11, 11,
Strip steel plates 12, 12, 12 are welded to the tops 11S, 11S, 11S of the eleventh. The width W of the strip-shaped steel plate 12 is at least twice the thickness T of the reinforcing rib 11. Further, the strip-shaped steel plates 12, 12, 12 of the reinforcing member 3 are attached to the inner surface of the steel pipe 2 so as to be insertable through a small gap. Then, at the time of manufacturing, after assembling the reinforcing body 3, the reinforcing body 3 is inserted and arranged from one side opening of the steel pipe 2, and the reinforcing body 3 is welded and fixed to the inner surface of the steel pipe 2 at the opening side where the welding rod or the like reaches. The inside is filled with a non-shrink mortar 4. Also, as shown in FIG.
The end of 11 is fixed to the strip-shaped steel plate 12 by a welded portion 14.
In this configuration, those having the following dimensions correspond to graphs described later.
This is shown in No. 2.

Next, a filled steel pipe 1A shown in FIG. 3 is obtained by further adding a reinforcing bar 21 to the filled steel pipe 1, and is located between two vertexes of the reinforcing member 3 as shown in FIG. 3, in which three rebars 21, 21, 21 are fixed in contact with the inner surface of the steel pipe 2. Then, at the time of manufacturing, the reinforcing bar 21 is inserted and arranged from one side opening of the steel pipe 2, the reinforcing bar 21 is welded and fixed to the inner surface of the steel pipe 2 within a range where a welding rod or the like reaches from the opening on both sides, and the reinforcing body 3 is assembled. After that, the reinforcing body 3 is inserted and arranged from one side opening of the steel pipe 2, and the reinforcing body 3 is welded and fixed to the inner surface of the steel pipe 2 on the opening side where the welding rod or the like reaches, and then the inside is filled with the non-shrinkable mortar 4. . In this configuration, the one having the following dimensions is shown in No. 3 of the graph described later.

FIG. 4 shows a filled steel pipe 1H as a comparative example, in which a non-shrinkable mortar 4 is filled in a steel pipe 2 and no reinforcing member is used. In this configuration, the following dimensions are
This is shown in No. 1 of the graph described later.

In the bending test, the steel pipe 2 is made of a material S
TK400, outer diameter 216.3 mm, thickness 8.2 mm,
The steel pipe 2, the reinforcing member 3, and the reinforcing bar 21 are the same in length and have a length of 3 meters. Thickness T of reinforcing rib 11 of reinforcing body 3
Is 6 mm, and the thickness of the strip-shaped steel plate 12 is also 6 mm. The non-shrink mortar 4 has a compressive strength of 60.0 kN / mm ² . Further, the reinforcing bar 21, with a profiled steel bar with a diameter of 25 millimeters, the deformed steel bar is made is in SD295A, tensile strength is 440 N / mm ^2. As described above, in the present invention, as for the reinforcing bar, a desired strength can be obtained with a steel rod having a tensile strength of 700 N / mm ² or less, that is, a steel rod having a large tensile strength and relatively expensive such as a PC steel rod is used. No need. Then, as shown in FIG. 5, both ends of the 3-meter steel pipe 2 are supported by moving fulcrums 201, 201, the distance between the free ends 201, 201 is 2.4 meters, and the center of the steel pipe 2 is the loading point. Load P
Was added. In FIG. 7, the horizontal axis indicates the deflection at the loading point (unit: millimeter), and the vertical axis indicates the load P (unit tf: 1tf = 9.8).
10 is a graph of a load-deflection test result taking a value of 0666 kN). In addition, when the both ends are the moving fulcrums 201, 201,
1 and 3, the lower side is the tensile area side when the load P is applied. FIG. 8 is a graph of a bending moment-rotation angle test result in which the vertical axis represents the bending moment at the loading point (unit: tf · m), and the horizontal axis represents the rotation angle θ (simply degrees) shown in FIG. And bending moment are values calculated from the graph of FIG. In the graphs of FIGS. 7 and 8, discontinuous steps (for example, the loading point deflection is around 110 mm, 2
(Approximately 15 mm) occurs at the point where the rod for applying the load is added due to the stroke of the load device (not shown) for applying the load P. Appears as a discontinuity in the graph.

According to the graph of FIG. 7, the filled steel pipe 1A (No. 3 in the graph) using the reinforcing member 3 and the reinforcing bar 21 has a higher load capacity than the filled steel pipe 1H (No. 1 in the graph) of the comparative example. The performance was improved by about 80%, and the filled steel pipe 1 using only the reinforcing body 3 (No. 2 in the graph) showed an increase of about 35%.
From the graph of FIG. 8, it can be seen that the filled steel pipes 1 and 1A can withstand the bending moment up to a larger rotation angle θ than the filled steel pipe 1H of the comparative example, and the shock absorbing ability is also improved.

As described above, according to the present embodiment, in the filled steel pipes 1 and 1A for protection structures such as falling rocks and avalanches in which the mixed material obtained by mixing cement is filled into the steel pipe 2, the cross section is circular. Inside the steel pipe 2, reinforcing ribs with a triangular cross section
In addition to providing 11,11,11 inscribed, reinforcing ribs 11,11,11
Since the two vertices 11S of 11 are arranged on the tensile region side of the steel pipe 2, the non-shrink mortar 4, which is a cement mixture material in the cross section, is restrained by the reinforcing ribs 11, 11, 11 inside the steel pipe 2, and the compressive stress is reduced. The reinforcement ribs 11 and 11
Because there is a rib 11 connecting the two vertices 11S, 11S,
This improves the tensile stress on the tensile region side against the tensile force generated by bending, and can effectively improve the stress against the load.

As described above, in the present embodiment, a plurality of longitudinal reinforcing bars 21, 21, 21 are provided inside the steel pipe 2 having a circular cross section. Since the reinforcing bars 21, 21, 21 are provided on the tensile region side of the steel pipe 2, the reinforcing bar 21 provided on the tensile region side inside the steel tube 2 improves the tensile stress on the tensile region side against the tensile force generated by bending, The stress against the load can be improved, and the reinforcing bars 21 on the side of the plurality of tensile regions are provided in close contact with the non-shrink mortar 4 which is a cement mixture, and are inexpensive as compared with steel which introduces prestress. And cost-effective.

Further, in this embodiment, as described above, the reinforcing bar 21 is provided in contact with the inner surface of the steel pipe.
Since the reinforcing bar 21 provided in contact with the inner surface is integrated with the steel pipe 2 and resists the tensile force generated by bending, the load bearing performance can be effectively improved.

Further, as described above, in the present embodiment, the strip-shaped steel sheet having the width W of twice or more the thickness T of the reinforcing rib 11 is provided at the apex 11S of the reinforcing rib 11,11. 12 and the strip-shaped steel plate 12 was fixed to the inner surface of the steel pipe 2,
By providing the strip-shaped steel plate 12 at the apex 11S, the connection of the reinforcing ribs 11, 11 at the apex 11S is facilitated, and the bonding strength can be improved. The reinforcing rib 11 may be partially provided with a hole.
The non-shrink mortar 4 (mixed material) on both sides partitioned into two pieces is integrated.

As described above, according to the present embodiment, a method for manufacturing a filled steel pipe for protection structures such as falling rocks and avalanches in which a mixed material obtained by mixing cement is filled in the steel pipe 2 according to the sixth aspect of the present invention. A strip-shaped steel plate 12 having a width W substantially twice or more the thickness T of the reinforcing rib 11 is provided on the top 11S of the reinforcing ribs 11, 11.
After the reinforcing body 3 is formed, the reinforcing body 3 is inserted from one side opening of the steel pipe 2, and the reinforcing body 3 is fixed to the inner surface of the steel pipe 2. 4, the reinforcing body 3 is provided with the strip-shaped steel plate 12 at the apex 11S, so that the reinforcing ribs 11, 11 at the apex 11S can be easily connected and the bonding strength is improved. If the reinforcing body 3 assembled in this way is inserted into the steel pipe 2 and fixed to the two inner surfaces of the steel pipe, the reinforcing body 3 can be filled with the cement mixture as it is without displacement and the production can be performed. It becomes very simple.

According to the fourth, fifth and sixth aspects of the present invention,
Since the reinforcing member 21 or the reinforcing member 3 is fixed to the inner surface of the steel pipe 2, the steel pipe 2 to which the reinforcing bar 21 or the reinforcing member 3 is attached at the factory can be carried into the site, and then the cement mixture can be filled at the site. When a steel pipe is used as a column, the cement mixture can be filled after fixing the column, the weight during transportation and installation is reduced, and workability is excellent.

9 and 10 show a second embodiment of the present invention.
The same portions as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. In the filled steel pipe 1B of this example, a plurality of reinforcing members 3A are provided along the inner surface of the steel pipe 2. It has rebars 21A and rebars 21B arranged concentrically inside the rebars 21A. In this example, five rebars 21A are provided.
And three rebars 21A, the central rebar 21A and the rebar 21B are located on a straight line passing through the center of the steel pipe 2, and the rebars 21A and 21B are arranged at symmetrical positions with respect to this straight line. I have. End plates 22 are provided on both sides of the reinforcing member 3A, respectively. The end plates 22 have insertion holes 23 through which the reinforcing bars 21A and 21B are inserted, and have the same arc edge 24 as the inner surface of the steel pipe 2.
Furthermore, a notch hole 25 having a substantially semicircular shape is provided on the arc edge 24 and a hole 26 is provided on the center side. The notch holes 25 and the holes 26 facilitate air bleeding when filling concrete. The end plate 22 is made of a steel plate having a thickness of 9 mm.
The ends of the plurality of rebars 21A and 21B are inserted into the insertion holes 23 and fixed to the end plate 22 by welding. Then, at the time of manufacturing, after assembling the reinforcing body 3A, the reinforcing body 3A is inserted and arranged from one side opening of the steel pipe 2, and the reinforcing body 3A is placed at the opening side where the welding rod or the like reaches.
Is welded and fixed to the inner surface of the steel pipe 2, and then the inside is filled with a non-shrink mortar 4. It should be noted that the filling of the cement mixture can also be performed after loading on the site or after installation, so that the transport weight or the installation weight can be reduced. The steel pipe 2 and the non-shrink mortar 4 of the filled steel pipe 1B of this example are made of the same material as that of the first embodiment, and the rebars 21A and 21B are also made of the same material as the rebar 21. No. 4 in the graphs of FIGS. 7 and 8
It is shown in FIG.

7 and 8, the filled steel pipe 1B of this example (No. 4 in the graph) is the filled steel pipe 1H of the comparative example.
As compared to (No. 1 in the graph), the load-carrying performance and the shock absorbing ability were significantly improved, and performance improvements almost equivalent to those of the filled steel pipe 1A using both the reinforcing member 3 and the reinforcing bar 21 were observed.

As described above, in this embodiment, a plurality of reinforcing bars 21A, 21B, 21 in the longitudinal direction are provided inside the steel pipe 2 having a circular cross section, and the plurality of reinforcing bars 21A, 21B are provided on the tensile region side of the steel pipe 2. Since the reinforcing bars 21A and 21B are provided on the tensile region side inside the steel pipe 2, the tensile stress on the tensile region side is improved against the tensile force generated by bending, and the stress with respect to the load can be improved. The reinforcing bars 21A and 21B on the tensile area side are provided in close contact with the non-shrink mortar 4, which is a cement mixture, and need only be inexpensive as compared with a steel material that introduces prestress, and are cost-effective. Also, since the reinforcing bar 21A is provided in contact with the inner surface of the steel pipe 2, the reinforcing bar 21A provided in contact with the inner surface is integrated with the steel pipe 2,
Since it resists the tensile force generated by bending, the load-bearing performance can be effectively improved. According to the second, third, and fourth aspects, the same operation and effect as those of the first embodiment are achieved. ,
In this example, according to claim 7, in a method of manufacturing a filled steel pipe for a protection structure such as a rock fall or an avalanche filled with a mixed material in which cement is mixed inside the steel pipe 2, the steel pipe 2 is provided on the tensile region side in the steel pipe 2. After forming a reinforcing body 3A in which a steel end plate 22 having an arc edge 24 corresponding to the inner surface of the steel pipe 2 is fixed to both ends of the plurality of reinforcing bars 21A and 21B, the reinforcing body 3A is attached to the steel pipe 2. This is a manufacturing method in which the reinforcing member 3A is fixed to the steel pipe 2 by inserting the reinforcing member 3A into the steel tube 2 and then filled with the non-shrink mortar 4 as a cement mixture material.
Since the both ends of the plurality of reinforcing bars 21A and 21B are fixed by end plates 22 and 22, the reinforcing bars 21A and 21B are integrated without moving, and the reinforcing body 3A is inserted into the steel pipe 2. If the reinforcing body 3A is welded to the steel pipe in the vicinity of the opening on one side, the cement mixture can be filled as it is without displacement of the reinforcing bar, and the production becomes extremely simple.
Further, the steel pipe 2 to which the reinforcing body 3A is attached at the factory may be transported to the site, and thereafter, the cement mixture may be filled.

As an effect of the embodiment, since the end face plate 22 has a size of less than half the inner diameter of the steel pipe 2, the concrete can be smoothly filled. Also,
Since the end plate 22 has an arc edge 24 corresponding to the inner surface of the steel pipe 2, the plurality of rebars 21A and 21B can be positioned by engaging and fixing the arc edge 24 to the inner surface of the steel pipe 2.

FIGS. 11 to 12 show a third embodiment of the present invention. The same parts as those in the above embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted. The steel pipe 1A 'is made of the same steel as the above-mentioned filled steel pipe 1A except that the dimensions are different, and the steel pipe 2 of the filled steel pipe 1A' is made of a material STK.
400, an outer diameter of 267.4 mm, a thickness of 9.3 mm, and a length of 3 meters.
Are the same length, and the thickness T of the reinforcing rib 11 of the reinforcing body 3 is 6
Mm, the thickness of the strip-shaped steel plate 12 is 6 mm, and the non-shrink mortar 4 has a compressive strength of 60.0 kN / mm ² .
21 used a deformed steel bar having a diameter of 29 mm. The filled steel pipe 1A 'is shown in No. 5 in the graphs of FIGS. Also, the filled steel pipe 1B 'shown in FIG.
Is made of the same steel as the filled steel pipe 1B except that the dimensions are different, and the steel pipe 2 of the filled steel pipe 1B 'is made of a material STK40.
0, outer diameter 267.4mm, thickness 9.3mm, length 3
Meter pipe, steel pipe 2, reinforcing body 3, reinforcing steel 21A,
21B have the same length, the non-shrink mortar 4 has a compressive strength of 60.0 kN / mm ² , and the reinforcing bars 21A, 21B
Used a deformed steel bar having a diameter of 29 mm. The filled steel pipe 1B 'is shown in No. 6 in the graphs of FIGS.

From the graphs of FIGS. 7 and 8, the filled steel pipe 1A '(No. 4 in the graph) and the filled steel pipe 1B' of this example are:
It was found that both of these were excellent in load-bearing performance and shock absorbing ability, and that almost the same performance was obtained.

FIGS. 13 and 14 show a fourth embodiment of the present invention. The same parts as those in the above embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted. Is a filled steel pipe 1H ', and the steel pipe 2 is made of a material STK4.
00, an outer diameter of 139.8 mm, a thickness of 6.6 mm, and a length of 3 meters. The non-shrinkable mortar 4 is filled inside without using a reinforcing body. And this filled steel pipe 1
H ′ is shown in No. 7 of the graphs of FIGS. 7 and 8. The filled steel pipe 1C is formed by fixing three rebars 21, 21 and 21 in contact with the inner surface of the steel pipe 2. At the time of manufacture, the rebar 21 is inserted from one opening of the steel pipe 2 and arranged on both sides. The rebar 21 is welded and fixed to the inner surface of the steel pipe 2 within a range where a welding rod or the like can reach from the inside. The steel pipe 2 of the filled steel pipe 1C has a material of STK400, an outer diameter of 139.8 mm, a thickness of 6.6 mm, and a length of 3 meters, and is filled with the non-shrinkable mortar 4 therein. Used a deformed steel bar having a diameter of 22 mm. The filled steel pipe 1C is shown in No. 8 in the graphs of FIGS.

According to the graphs of FIGS. 7 and 8, the filled steel pipe 1C provided with the reinforcing bar 21 (No. 8 in the graph) has a higher load capacity than the filled steel pipe 1H 'of the comparative example (No. 7 in the graph). And the shock absorbing capacity is greatly improved, especially as shown in the graph of FIG. It can be seen that the rotation angle θ became large and the shock absorbing ability was effectively improved.

As described above, according to the present embodiment, in accordance with the second aspect, in a filled steel pipe for protection structures such as falling rocks and avalanches in which a non-shrink mortar 4 as a mixed material in which cement is mixed is filled into a steel pipe 2. A plurality of rebars 21 in the length direction are provided inside the steel pipe 2 having a circular cross section, and the plurality of rebars 21 are provided on the tension area side of the steel pipe 2. The tensile stress on the tensile region side is improved against the tensile force generated by bending, and the stress with respect to the load can be improved. The reinforcing bars 21 on the plurality of tensile regions are provided in close contact with the cement mixture. It is cheaper and more cost effective than prestressed steel.

As described above, according to the present embodiment, claim 4
In response to this, since the reinforcing bar 21 is provided in contact with the inner surface of the steel pipe, the reinforcing bar 21 provided in contact with the inner surface is integrated with the steel pipe 2 and resists the tensile force generated by bending. Can be improved.

FIG. 15 shows a fifth embodiment of the present invention. The same parts as those in the above embodiments are denoted by the same reference numerals, and the detailed description thereof is omitted. , 1
This is an example in which A ', 1B, 1B', and 1C are used for the protective fence 31. In the protective fence 31, the support column 32 and the cross beam 33 are formed from the filled steel pipes 1, 1A, 1A ', 1B, 1B', and 1C. Become a pillar
32 is erected on a foundation 34 made of concrete or the like, and a cross beam 33 connects the upper portions of adjacent columns 32, 32. Therefore, when the pillar 32 having the fixed lower end is subjected to rock fall or avalanche from the mountain side, the upper end side is bent so as to move to the valley side, so that the mountain side is a tension region, and the cross beam 33 is a rock fall from the mountain side. -When subjected to an avalanche, bending occurs so that the center of the cross beam 33 moves to the valley side, so that the valley side becomes a tension region.

FIG. 16 shows a sixth embodiment of the present invention. The same parts as those in the above embodiments are denoted by the same reference numerals, and a detailed description thereof will be omitted. In FIG. In the filled steel pipe 1, the height position of about one third of the height H on the foundation 34 of the steel pipe 2 is the upper end of the reinforcing body 3, and the lower end of the reinforcing body 3 is the lower end of the steel pipe 2.

Since the reinforcing body 3 after assembly has self-supporting properties, one side opening (in this case, the steel pipe 2 opening at the lower end of the column 32)
If the reinforcing member 3 is fixed to the inner surface of the steel pipe 2 by welding or the like within a range reaching from one side opening, the cement mixture can be filled in the steel pipe 2. When the column 32 with the fixed lower end bends, a maximum bending moment is generated at the upper surface of the foundation 34, and the reinforcing body 3 resists this, while the upper portion of the column 32 is less than this, and rocks fall. If it is received, no bending moment is generated, and no reinforcement is required. Therefore, it is lighter and cheaper than the case where the reinforcing body 3 is provided over the entire length.

As described above, according to the present embodiment, in the method for manufacturing a filled steel pipe for a protection structure such as a falling rock or an avalanche in which a mixed material in which cement is mixed is filled into the steel pipe 2, Tops 11S, 11 of reinforcing ribs 11,11,11
After forming a reinforcing member 3 in which a strip-shaped steel plate 12 having a width W substantially twice or more the thickness T of the reinforcing rib 11 is fixed to S and 11S, the reinforcing member 3 is inserted from one side opening of the steel pipe 2. Since the reinforcing member 3 is fixed to the inner surface of the steel pipe 2 and then the inside of the steel tube 2 is filled with the non-shrink mortar 4 as a cement mixture, the reinforcing member 3 is provided by providing the strip-shaped steel plate 12 at the apex 11S. The reinforcement ribs 11 and 11 at the apex 11S can be easily connected to each other, and the bonding strength can be improved. If the reinforcing body 3 assembled in this way is inserted into the steel pipe 2 and fixed to the inner surface of the steel pipe 2, In addition, the cement mixture can be filled as it is without displacement of the reinforcing member 3, and the production becomes extremely simple. And also in this example, there is an advantage that the steel pipe 2 can be filled with a cement mixture material such as mortar or concrete on site.

As described above, in the present embodiment, claim 8
In response to this, the filled steel pipe 1 is used for the column 32 and the reinforcing member 3
Is the length from the lower end of the filled steel pipe 1 to a position less than one half of the above-ground part. Therefore, when the filled steel pipe 1 is used as the column 32, when a load is applied, the maximum bending stress occurs at the ground surface position So, to increase the strength against this,
It is not necessary to insert a reinforcing material into the entire length, and since the reinforcing material 3 of the present invention is self-supporting itself, even if it is fixed to the steel pipe 2 by welding or the like only at one opening side without inserting the reinforcing material, the cement mixed material is not used. The filling can be performed smoothly, and therefore, the load resistance required for the support column 32 can be obtained while further reducing the material cost as compared with the case where the reinforcing body 3 is inserted in the entire length. If the upper position of the reinforcing member 3 exceeds a half of the height H, the merits of material cost and weight reduction are reduced. Since stress is generated, the upper position of the reinforcing pair is set to a position not more than 3 minutes of the height H.

FIGS. 17 and 18 show the seventh and eighth embodiments of the present invention.
In this embodiment, the same parts as those in the above embodiments are denoted by the same reference numerals, and the detailed description thereof will be omitted. In FIG. 17, the filled steel pipe 1A as the column 32 is provided on the base 34 of the steel pipe 2. The height position of about one third of the height H is the upper end of the reinforcing member 3 and the reinforcing bar 21, and the lower end of the reinforcing member 3 and the reinforcing bar 21 is the lower end of the steel pipe 2. The support 32 in FIG. 17 has an upper portion curved toward the valley side R.

In FIG. 18, the filled steel pipe 1B, which is the column 32, is located at a height of about one third of the height H on the foundation 34 of the steel pipe 2 at the upper end of the reinforcing body 3A, Lower end is steel pipe 2
It is the lower end of. The support 32 in FIG. 18 has an upper portion inclined on the valley side R.

If the reinforcing bar 21 shown in FIG. 14 is also fixed in the steel pipe 2 at one opening side, there is no displacement.
Similarly, the upper end of the rebar 21 can be located at one third of the height H of the column 32, and the lower end can be the lower end of the column 32.

As described above, according to the present embodiment, in the method for manufacturing a filled steel pipe for a protection structure such as a falling rock or an avalanche in which a mixed material obtained by mixing cement is filled in the steel pipe 2, Reinforcing bars 21 provided on the tension area side
A, 21B, arc edges 24 corresponding to the inner surface of steel pipe 2
After forming the reinforcing body 3A to which the end plate 22 having
After inserting the reinforcing body 3A from one side opening of the steel pipe 2 and fixing the reinforcing body 3A to the steel pipe 2, the inside of the steel pipe 2 is filled with the non-shrink mortar 4 as a mixture. Since both ends of the reinforcing bars 21A and 21B are fixed by the end plates 22, the reinforcing bars 21A and 21B are integrated without moving, and the reinforcing body 3A is inserted into the steel pipe 2,
If the reinforcement 3A is fixed to the steel pipe 2 near the opening on one side, the reinforcing steel
The cement mixture can be filled as it is without displacement of 21A and 21B, and the production becomes extremely simple. And also in this example, there is an advantage that the steel pipe 2 can be filled with a cement mixture material such as mortar or concrete on site.

As described above, in the present embodiment, claim 8
In response to the above, filled steel pipes 1A and 1B are used for columns 32,
The reinforcing members 3 and 3A have a length from the lower ends of the filled steel pipes 1A and 1B to a position that is less than half of the above-ground portion.
Functions and effects similar to those of the embodiment are achieved.

The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention. For example, in the embodiment, as the mixed material mixed with cement, various materials such as concrete and mortar can be used as long as they are solidified after filling.

[0055]

According to the first aspect of the present invention, a reinforcing rib having a triangular cross section is provided inside a steel pipe having a circular cross section.
The two apexes of the reinforcing rib are arranged on the tensile region side of the steel pipe, and can be made relatively inexpensive to improve the strength against loads such as falling rocks and avalanches.

The invention according to claim 2 is that a plurality of reinforcing bars in the longitudinal direction are provided inside the steel pipe having a circular cross section, and the plurality of reinforcing bars are provided on the tensile region side of the steel pipe. Thus, the strength can be improved against loads such as falling rocks and avalanches.

The invention according to claim 3 is that a plurality of reinforcing bars in the longitudinal direction are provided inside a steel pipe having a circular cross section, and the plurality of reinforcing bars are provided on the tensile region side of the steel pipe. Thus, the strength can be improved against loads such as falling rocks and avalanches.

Further, according to a fourth aspect of the present invention, the reinforcing steel bar is provided in contact with the inner surface of the steel pipe.
A band-shaped steel plate having a width of twice or more is fixed, and this band-shaped steel plate is fixed to the inner surface of the steel pipe.It is relatively inexpensive and can improve strength against loads such as falling rocks and avalanches. In addition, the manufacturing is easy and the manufacturing cost can be reduced.

According to a sixth aspect of the present invention, a reinforcing member having a band-shaped steel plate having a width of at least twice as large as the thickness of the reinforcing rib is formed on the top of the reinforcing rib having a triangular cross section. A method of inserting the steel pipe from one side opening, fixing the reinforcing body to the inner surface of the steel pipe, and then filling the mixed material into the steel pipe, making it relatively inexpensive, and against loads such as falling rocks and avalanches. Thus, the strength can be improved, the manufacturing is easy, and the manufacturing cost can be reduced.

According to a seventh aspect of the present invention, after forming a reinforcing member in which end plates having arcuate edges corresponding to the inner surface of the steel pipe are fixed to both ends of a plurality of reinforcing bars provided on the tensile region side in the steel pipe, A method of inserting the reinforcing body from one side opening of the steel pipe, fixing the reinforcing body to the steel pipe, and then filling the mixed material into the steel pipe. Can improve the strength against the load of
The production is easy and the production cost can be reduced.

The invention according to claim 8 is a manufacturing method wherein the filled steel pipe is used for a column, and the reinforcing member has a length from a lower end of the filled steel pipe to a position less than one half of a ground part. In addition, it can be made relatively inexpensive and can improve the strength against loads such as falling rocks and avalanches, making it easy to manufacture and reducing the manufacturing cost.

[Brief description of the drawings]

FIG. 1 is a sectional view of a filled steel pipe provided with a reinforcing member according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of the reinforcing member according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view of a filled steel pipe provided with a reinforcing member and a reinforcing bar according to the first embodiment of the present invention.

FIG. 4 is a sectional view of a filled steel pipe as a comparative example showing the first embodiment of the present invention.

FIG. 5 is an explanatory view of a load test showing the first embodiment of the present invention.

FIG. 6 is an explanatory diagram of a rotation angle in a load test showing the first embodiment of the present invention.

FIG. 7 is a graph showing a load-deflection test result.

FIG. 8 is a diagram showing a graph of a result of a moment-rotation angle test.

FIG. 9 is a sectional view of a filled steel pipe showing a second embodiment of the present invention.

FIG. 10 is a sectional view taken along line AA of FIG. 9 showing a second embodiment of the present invention.

FIG. 11 is a sectional view of a filled steel pipe provided with a reinforcing member and a reinforcing bar according to a third embodiment of the present invention.

FIG. 12 is a sectional view of a filled steel pipe provided with a reinforcing member according to a third embodiment of the present invention.

FIG. 13 is a sectional view of a filled steel pipe as a comparative example showing the fourth embodiment of the present invention.

FIG. 14 is a sectional view of a filled steel pipe provided with a reinforcing bar according to a fourth embodiment of the present invention.

FIG. 15 is a front view of a use example of a filled steel pipe according to a fifth embodiment of the present invention, in which a part of a protective fence is cut away.

FIG. 16 is a sectional view showing a sixth embodiment of the present invention, in which a filled steel pipe is used for a column.

FIG. 17 is a sectional view showing a seventh embodiment of the present invention, in which a filled steel pipe is used for a column.

FIG. 18 is a sectional view of a column using a filled steel pipe according to an eighth embodiment of the present invention.

[Explanation of symbols]

 1, 1A, 1A ', 1B, 1B', 1C Filled steel pipe 2 Steel pipe 3, 3A Reinforcement 4 Non-shrink mortar (mixed material) 11 Reinforcement rib 11S Apex 12 Strip steel plate 21, 21A, 21B Rebar 22 End plate 24 Arc Edge 32 Post T Thickness W Width

 ──────────────────────────────────────────────────続 き Continuing on the front page (71) Applicant 500464517 Yutaka Hosokawa 91, Tsukioka Nishi Midoricho, Toyama City, Toyama Prefecture (72) Inventor Yutaka Hosokawa 91, Tsukioka Nishi Midoricho, Toyama City, Toyama Prefecture (72) Inventor Masao Ito Niigata, Niigata Prefecture 2-34, Ichiseki-shin 1-chome Wako Bussan Co., Ltd. F-term (reference) 2D001 PA05 PA06 PD10

Claims (8)

[Claims] 1. A filled steel pipe for a rock fall, avalanche, or other protective structure filled with a mixture of cement mixed into a steel pipe, wherein a reinforcing rib having a triangular cross section is provided inside the steel pipe having a circular cross section. A filled steel pipe for a protection structure such as a falling rock or an avalanche, wherein two apexes of the reinforcing rib are arranged on a tensile region side of the steel pipe. 2. A filled steel pipe for a protection structure such as a falling rock or an avalanche in which a mixed material obtained by mixing cement is filled into a steel pipe, wherein a plurality of lengthwise reinforcing bars are provided inside the steel pipe having a circular cross section. A filled steel pipe for protection structures such as falling rocks and avalanches, wherein the reinforcing steel is provided on the tensile area side of the steel pipe. 3. The rock fallen rock according to claim 1, wherein a plurality of reinforcing bars in the longitudinal direction are provided inside the steel pipe having a circular cross section, and the plurality of reinforcing bars are provided on the tensile region side of the steel pipe.
Filled steel pipe for protection structures such as avalanches. 4. The filled steel pipe for protection structures such as falling rocks and avalanches according to claim 2, wherein the reinforcing steel is provided in contact with the inner surface of the steel pipe. 5. A strip-shaped steel plate having a width of at least twice the thickness of the reinforcing rib is fixed to the top of the reinforcing rib, and the strip-shaped steel plate is fixed to the inner surface of the steel pipe. The filled steel pipe for protection structures such as falling rocks and avalanches according to 1 or 3. 6. A method for producing a concrete-filled steel pipe for a protection structure such as a rock fall or an avalanche in which a steel pipe is filled with a mixed material mixed with cement, wherein the thickness of the reinforcing rib is approximately equal to the top of the reinforcing rib having a triangular cross section. After forming a reinforcing body to which a band-shaped steel plate having a width of twice or more is fixed, the reinforcing body is inserted from one side opening of the steel pipe, and the reinforcing body is fixed to an inner surface of the steel pipe. A method for producing a filled steel pipe for protection structures such as falling rocks and avalanches, characterized by filling a mixed material. 7. A method of manufacturing a filled steel pipe for a protection structure such as a falling rock or an avalanche in which a mixed material in which cement is mixed is filled in a steel pipe, wherein both ends of a plurality of reinforcing bars provided on a tensile region side in the steel pipe are provided. After forming a reinforcing body to which an end plate having an arc edge corresponding to the inner surface of the steel pipe is fixed, the reinforcing body is inserted from one side opening of the steel pipe, and the reinforcing body is fixed to the steel pipe. A method for producing a filled steel pipe for protection structures such as falling rocks and avalanches, wherein the mixed material is filled in the interior of the pipe. 8. The steel pipe according to claim 6, wherein the steel pipe is used for a column, and the reinforcing body has a length from a lower end of the steel pipe to a position less than a half of a ground part. Of filling steel pipes for protection structures such as falling rocks and avalanches.