JP2002004223A - Steel-assist rigid bamboo girder, bamboo column and bamboo plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that a conventional bamboo flat plate and bamboo glued laminated wood has a thin cross section size, its strength is low, and it is used mainly as the house construction material of a building, but it is not used for a large cross section structural member of a bridge passing the truck load of 25 ton or the like, in addition, even when the large cross section glued laminated wood is made of bamboo, the strength of bamboo itself is low, and the bridge cannot pass a weight vehicle such as the 25 ton truck. SOLUTION: A very strong girder, a column or a plate can be made by embedding steel plates with ribs or reinforcing bars using an adhesive on the upper flange and the lower flange of the girder of the glued laminated wood of the large cross section or the outer peripheral part of the column of the bamboo glued laminated wood of the large cross section or the upper flange part and the lower flange part of the plate of the bamboo glued laminated wood of the large cross section, it is made into a structural material to make the bridge, a strong bridge which can pass the weight of the 25 ton truck.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique used for beams, beams, columns and floorboards of bridges and buildings.

[0002]

2. Description of the Related Art Moso bamboo, which grows in large quantities in Shikoku, Japan, has been commercialized as bamboo slabs and used as flooring, wall and ceiling materials for construction. In addition, bamboo slabs are laminated and adhered to produce bamboo glued lumber, which is used for building beams, columns and floorboards.

[0003]

The conventional bamboo slabs and bamboo laminated timbers are mainly used as building materials for buildings because of their small cross-sectional dimensions and low strength. It is not used for a member for a sectional structure. Also, even if you make a large section glulam from bamboo and combine it to make a bridge, the strength of the bamboo itself is low,
Heavy vehicles such as 25-ton trucks cannot pass over the bridge.

[0004]

Means for Solving the Problems On the upper and lower flanges of the girders of large section bamboo laminated timber, on the outer periphery of pillars of large section bamboo laminated timber, or on large section bamboo laminated timber. By embedding and bonding a ribbed steel plate or reinforcing steel to the upper and lower flanges of the plate using an adhesive, it is possible to make extremely strong girders, columns and plates, and use this as a structural member. If you build a bridge, you can build a strong bridge that can pass a 25-ton truck load.

[0005]

The present invention utilizes the natural law of plane maintenance in structural mechanics shown in FIG. That is, in the case of the steel stiffened bamboo girder of claim 1 of FIG. 4A, when a bending moment acts as shown in FIG. 4B, the ratio between the Young's modulus of the steel and the Young's modulus of the bamboo is n. At this time, the stress generated at the point C of the large section bamboo laminated wood sandwiched between the ribbed steel plate at the upper flange portion and the reinforcing bar at the lower flange portion is only one-nth of the stress generated at the point C of the reinforcing bar. It can be used by sandwiching low strength bamboo between upper and lower steel.

[0006] The law of nature of plane retention is the case of the steel stiffened bamboo girder of claim 1 of FIG. 1, the steel stiffened bamboo column of claim 2 of FIG. 2, and the steel stiffened bamboo plate of claim 3. , In common, effective.

As shown in FIG. 5, the natural law of plane retention is also applied to the theory of calculating the bending stiffness of a steel stiffened bamboo girder, and is defined using the ratio n between the Young's modulus of steel and the Young's modulus of bamboo. Can be formulated as That is, the second moment of area of the steel stiffened bamboo girder of the present invention is obtained by adding (n-1) times the second moment of area of steel to the second moment of area of the bamboo itself. As a result, a long span bamboo bridge for heavy vehicles can be designed.

[0008]

[Strength experiment of large section bamboo laminated wood] As shown in Fig. 6, a test piece of a large section bamboo laminated wood and a cedar laminated wood was manufactured, and a loading test was performed. The results were as shown in FIGS. 6 (b) and 6 (c).

[0009]

FIG. 7 shows an embodiment of the present invention. That is, the bamboo bridge (SB bridge,
Steel stiffened Bamboo br
id), and can pass through a 25-ton heavy truck or the like.

FIG. 8 also shows an embodiment of the present invention. That is,
It is an SB bridge using the steel stiffening bamboo column of the present invention for a bridge pier and the steel stiffening bamboo plate of the present invention for a main girder.

[0011]

The effects of the present invention are as follows.

Compared with the conventional wooden bridge in which the glued laminated timber of the main girder is not stiffened with steel, the steel stiffened bamboo bridge of the present invention has much higher strength and bending stiffness, so that a bridge between long supports for heavy vehicles can be designed. .

The steel stiffening bamboo bridge of the present invention uses a large amount of domestically produced Moso bamboo and the like, which contributes to the local industry of bamboo materials.

The steel stiffening bamboo bridge of the present invention is light in weight as a whole and can be designed in a prefabricated manner, so that it can be easily transported, and the site construction is simple and fast.

The steel stiffened bamboo bridge of the present invention is made of bamboo, so that it is very light as compared with a concrete bridge, so it is advantageous against earthquakes, and the lower construction cost is correspondingly reduced.

Since the steel stiffened bamboo bridge of the present invention is a steel floor plate, it is resistant to the negative bending moment at the pier position, so it is suitable for a continuous girder type. Does not require a fall prevention device.

Since the wooden slab of the conventional wooden bridge is made of wood, it is apt to be painful and the drainage of the bridge surface is not good. Therefore, rainwater contaminates the wooden main girder and maintenance cost is required. Since the floor plate of the steel stiffened bamboo bridge of the present invention is a steel floor plate, the load bearing capacity is excellent and the bridge surface drainage is good, so that a life of 100 years can be expected.

When a conventional concrete bridge is replaced, it cannot be recycled and becomes industrial waste. However, since the steel stiffened bamboo bridge of the present invention is made of bamboo and iron, it can be recycled. Because the exterior is Takebashi, it is warm and friendly to people and nature.

[Brief description of the drawings]

FIG. 1 is a sectional view of a steel stiffening bamboo girder according to claim 1;

FIG. 2 is a sectional view of a steel stiffening bamboo column according to the second embodiment.

FIG. 3 is a sectional view of a steel stiffened bamboo sheet according to claim 3;

FIG. 4 is an explanatory diagram of the law of holding a plane.

FIG. 5 is an explanatory diagram of a theory of bending rigidity calculation.

FIG. 6 is an explanatory view of a strength test of a bamboo laminated wood and a cedar laminated wood having a large cross section.

FIG. 7 is an embodiment of a steel stiffened bamboo girder bridge using the steel stiffened bamboo girder of the present invention as a main girder.

FIG. 8 is an embodiment in which the steel stiffening bamboo column of the present invention is used for a bridge pier and the steel stiffening bamboo plate of the present invention is used for a main girder of a bridge.

[Explanation of symbols]

 1 Girder of bamboo laminated timber 2 Bamboo laminated timber is also pillar 3 Bamboo laminated timber plate 4 Steel plate with ribs 5 Reinforcing bar 6 Adhesion with adhesive

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[Procedure amendment]

[Submission Date] June 24, 2000 (2006.2.
4)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Explanation of sign

[Correction method] Oath

[Correction contents] In the explanation of the reference code, "2 bamboo laminated timber columns" is corrected to "2 bamboo laminated timber columns". Although it is a waste, the steel stiffened bamboo bridge of the present invention is made of bamboo and iron, so it can be recycled, and since the appearance is a bamboo bridge, it is warm and friendly to people and nature.

[Brief description of the drawings]

FIG. 1 is a sectional view of a steel stiffening bamboo girder according to claim 1;

FIG. 2 is a sectional view of a steel stiffening bamboo column according to the second embodiment.

FIG. 3 is a sectional view of a steel stiffened bamboo sheet according to claim 3;

FIG. 4 is an explanatory diagram of the law of holding a plane.

FIG. 5 is an explanatory diagram of a theory of bending rigidity calculation.

FIG. 6 is an explanatory view of a strength test of a bamboo laminated wood and a cedar laminated wood having a large cross section.

FIG. 7 is an embodiment of a steel stiffened bamboo girder bridge using the steel stiffened bamboo girder of the present invention as a main girder.

FIG. 8 is an embodiment in which the steel stiffening bamboo column of the present invention is used for a bridge pier and the steel stiffening bamboo plate of the present invention is used for a main girder of a bridge.

[Description of Signs] 1 Girder of bamboo laminated timber 2 Pillar of bamboo laminated timber 3 Bamboo laminated timber 4 Steel plate with ribs 5 Reinforcement 6 Adhesion with adhesive

[Procedure amendment]

[Submission date] September 18, 2000 (2009.1.
8)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Explanation of sign

[Correction method] Change

[Correction contents]

[Description of Signs] 1 Girder of bamboo laminated timber 2 Pillar of bamboo laminated timber 3 Bamboo laminated timber 4 Steel plate with ribs 5 Reinforcement 6 Adhesion with adhesive

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) E04C 2/14 E04C 3/18 3/18 3/36 3/36 E01D 5/00 (72) Inventor Yoshida Ryoji 64, Nakatsuyama, Hachiman-cho, Tokushima City, Tokushima Prefecture (72) Inventor Osamu Watanabe 1812 Kitsuki Sumiyoshi-cho, Nakahara-ku, Kawasaki City, Kanagawa Prefecture F-term (reference) 2B250 AA01 AA02 AA05 AA31 BA04 DA04 EA01 EA13 FA13 FA31 FA41 2D059 AA05 AA13 AA21 GG01 2E162 BA02 CC02 2E163 FA02 FA12 FF03 FF04

Claims (3)

[Claims] 1. A ribbed steel plate 4 or a reinforcing bar 5 is provided on an upper flange portion and a lower flange portion of a girder 1 having a large section of bamboo laminated timber.
Stiffening bamboo girder embedded and bonded with adhesive 6 2. A steel stiffened bamboo column in which a ribbed steel plate 4 or a reinforcing bar 5 is embedded and bonded to the outer periphery of a large section bamboo laminated timber column 2 using an adhesive 6. 3. A ribbed steel plate 4 or a reinforcing bar 5 is provided on an upper flange portion and a lower flange portion of a bamboo laminated timber plate 3 having a large cross section.
Stiffened bamboo board embedded and bonded with an adhesive 6