JP2014020192A - Steel bar reinforcement wooden structure in construction and bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that a "specific strength" is a value resulting from dividing a strength of a material with a specific weight of that material, a material having a large value of specific strength is "light and strong", a material having a small value of specific strength is "heavy and weak", the material having the largest value of specific strength is timber of Japanese cedar or the like, the material with the next largest value is steel, the material of the smallest value is concrete, namely, concrete is a heaviest and weakest material, therefore, since an inertia force ((dead weight)×(acceleration of earthquake)) in the case of an earthquake is large, heavy concrete is easy to collapse by itself and since concrete is used frequently for floors, walls or poles of buildings or main girders, bridge piers or bridge abutment of bridges conventionally, such buildings or bridges may collapse by themselves since they are heavy and have large inertia forces in the case of an earthquake.SOLUTION: It is better to stop using concrete of a small specific strength for floors, walls or poles of buildings or main girders, bridge piers or bridge abutment of bridges but to use timber of a high specific strength and the buildings or the bridges are reinforced by burying steel frames in the outer periphery of the timber.

Description

  The present invention is a new technology related to structural design in architectural engineering and bridge engineering.

As shown in Table 1, the strength of the material has a concept of “specific strength”, and “specific strength” is a value obtained by dividing strength (kg / cm ² ) by specific gravity, and this value is large. Is a “light and strong material”, and a small value is a “heavy and weak material”.

  When a slab (thick board) is made of heavy and weak concrete, a large amount of reinforcing bars must be embedded in the concrete slab for reinforcement. This is the “Reinforced concrete slab”. Therefore, if a steel bar is reinforced by embedding reinforcing bars on the upper and lower surfaces of a light and strong wood slab, a lighter and stronger slab can be made that is superior to the “steel reinforced concrete slab”. This slab is called “SW slab”, which is Steel-stiffened Wood Slab, a hybrid slab, and is light and strong.

  Since concrete with low specific strength has been used for floors, walls, pillars, etc. of conventional buildings, it is heavy and weak, so the inertia force ((self weight) X (acceleration of earthquake)) is large during an earthquake. There is a high possibility of collapse.

  Since the floor of a conventional building uses a horizontal slab made of keystone plates and concrete mortar, the specific strength is low, and it takes about one month for the concrete mortar to harden, making it difficult to recycle.

  Because vertical slabs containing asbestos (asbestos) are used for the walls of conventional buildings, there is a high risk of harm to workers' health due to the extremely toxic asbestos dust in the future during renovation and removal. Is difficult.

A concrete PC bridge made of concrete with a low specific strength is used for the conventional superstructure of the bridge. Since it is heavy and weak, it has a large inertial force in the event of an earthquake and has a high possibility of dropping itself.
In fact, in the Great East Japan Earthquake, many concrete PC bridges have been dropped.

Conventional bridge substructures use concrete piers and abutments with low specific strength. They are heavy and weak, so they have a high inertial force during earthquakes and are highly likely to collapse.
In fact, most of the concrete piers have collapsed in the Great Hanshin Earthquake.

Means to solve the problem

  First, concrete mortar with low specific strength was not used at all for the floor of the building, but a “horizontal SW slab” with high specific strength was used.

  Secondly, the wall of the building is made of “vertical SW slab” with high specific strength, without using highly poisoned asbestos-containing walls.

  Thirdly, “reinforced concrete columns” with low specific strength were stopped as architectural columns and “SW columns” with high specific strength were used.

  Fourthly, the “concrete PC bridge” with a low specific strength was stopped for the superstructure of the bridge, and a “SW bridge” with a high specific strength was used.

  Fifth, “concrete piers / abutments” with a low specific strength were stopped on the piers / abutments of the substructure of the bridge to make “SW piers / abutments” with a high specific strength.

  Sixth, we decided to use the wood materials used for the above SW structure that are certified by JAS (Japanese Agricultural Standards) of laminated lumber made of thinned timber and other LVL (single-ply laminated material) .

Cross section of SW slab Cross section of SW pillar (square section) Cross section of SW pillar (circular cross section) Cross section of SW beam SW cross section General view of SW bridge Basic design of SW pier Example of SW beam factory production

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  In FIG. 1, it is shown that two reinforcing bars are embedded and reinforced on the upper and lower surfaces of one wood material of the SW slab.

  FIG. 2 shows that two reinforcing bars are embedded and reinforced around the outside of the three wooden pillars of the SW pillar having a square section.

  FIG. 3 shows that two reinforcing bars are embedded and reinforced around the outside of the three wood pillars of the SW pillar having a circular cross section.

  FIG. 4 shows that two reinforcing bars are embedded and reinforced on the upper and lower sides of the four wooden beams of the SW beam.

  In FIG. 5, 6SW pillars, 8SW floors, and 9SW walls in SW architecture are shown.

  In FIG. 6, a general view of SW bridge is shown, 14 bridge superstructure, 15SW pier, 16SW abutment and 17 steel pipe foundation pile are shown, and in AA cross section of 14 bridge superstructure, 10 steel The floor slab, 11 deck plate, 12U rib and 7SW beam are shown, and the 19 connecting vertical steel plate and 7SW beam are shown to be connected in situ by 19 site bonding.

  In FIG. 7, as the AA sectional view of the 15SW pier shows, the SW pier shows that one wooden material is reinforced by two reinforcing bars.

  In FIG. 8, as an example, a method of manufacturing a SW beam factory is shown, and a flange portion of one wood material of the SW beam is separated and processed in advance, and two rebars are bonded to 18 factories later by an adhesive. It has been shown that.

1 Wood material 2 Reinforcing bar 3 Wood pillar (square cross section)
4 Wood pillar (circular cross section)
5 Wood beam 6 SW column 7 SW beam 8 SW floor 9 SW wall 10 Steel floor slab 11 Deck plate 12 U rib 13 Vertical steel plate for connection 14 Bridge superstructure 15 SW pier 16 SW abutment 17 Steel pipe foundation pile 18 Factory bond 19 Site Glue,
,
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Claims (1)

  Stop using concrete with low specific strength for building floors, walls, pillars and bridge main girders, piers, and abutments. Instead, use wood with high specific strength and rebar around the outside. Reinforce by embedding.

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