WO2004040075A1

WO2004040075A1 - Load bearing wall, and steel house using the load bearing wall

Info

Publication number: WO2004040075A1
Application number: PCT/JP2003/005287
Authority: WO
Inventors: Yoshimitsu Murahashi; Shigeaki Tohnai; Hiroshi Tanaka; Hiroshi Ito
Original assignee: Nippon Steel Corporation; Nichiha Corporation
Priority date: 2002-10-30
Filing date: 2003-04-24
Publication date: 2004-05-13
Also published as: AU2003227365A1; AU2003227365A8; KR20070114827A; KR20050062785A; JP3617837B2; TWI266821B; CN1694992A; TW200406525A; JP2004150126A; KR100891209B1

Abstract

An inexpensive load bearing wall (1) capable of providing an excellent shearing strength and sufficiently absorbing vibration energy and a steel house using the load bearing wall, the load bearing wall (1) comprising a steel frame body (2) formed by framing shape steels (21) in rectangular shape and a structural surface material (3) fixed to the steel frame body (2), the structural surface material (3) further comprising a cement board provided by dispersing a cement based inorganic material, a silica containing-material, light-weight aggregate, and reinforcing fibers into water to form slurry, molding and dewatering the slurry to form a monolayer mat, winding the monolayer mat on a making roll by multiple layers until the thickness thereof becomes a specified thickness to form a laminated mat, cutting off the laminated mat from the making roll, and press-forming the laminated mat to manufacture a press mat, and curing the press mat.

Description

Description Steel wall and steel housing using the same

TECHNICAL FIELD The present invention relates to a steel wall comprising a steel frame formed by shaping a shaped steel into a rectangular shape, a structural face member fixed to the steel frame, and a steel house using the same. Background art

2. Description of the Related Art Conventionally, there is a steel wall formed by shaping a shaped steel into a rectangular shape and a structural wall fixed to the steel frame.

2001-55807).

That is, the anti-moisture wall is formed by forming a frame of a wall structure by a normal framed wall construction method (2 × 4 construction method) from a thin, light-weight shaped steel. As a structural surface material, wood plywood having a thickness of about 9 mm is usually used. '

A steel house was constructed using such a wall. However, in a building or the like in which the wall cannot be sufficiently arranged, when the strength of the wall is required, the wood plywood is used. There is a problem that it is difficult to obtain sufficient seismic resistance of the used wall. In other words, the shear strength characteristics satisfying the primary design (allowable stress design) for medium-scale earthquakes and the secondary design (holding design) for large-scale earthquakes based on the Building Standards Law are obtained. It is difficult.

The primary design is designed to prevent damage to the walls due to a medium-scale earthquake, and the secondary design is designed to prevent vibration energy during a large-scale earthquake. It is designed to absorb buildings and prevent building collapse.

That is, shear strength and vibration energy absorption are required.

Also, the values required for the primary design and the secondary design differ depending on various conditions. The values required for the primary design are determined by the building shape and location conditions. The values required for the secondary design are governed by the characteristics of the structural facings themselves. After the structural material yields, there is no significant increase in power resistance. There is almost no decrease in power resistance, and the surface material is sufficiently deformed even after yielding. (If a surface material with a shear deformation angle of 0.03 rad is used, the secondary The design value is about 1.5 times the primary design value.

In other words, when a face material having such characteristics is used, for example, as shown in FIG. 11, in the graph showing the relationship between the load applied to the fender-resistant wall and the resulting shear deformation angle, points P and Q Are required for the primary design and the secondary design, respectively (see Example 3).

However, when wood plywood is used as the structural panel, the required value of the secondary design is about 2.0 times larger than that of the primary design, and it is necessary to satisfy this requirement.

Therefore, the above primary and secondary designs can be satisfied by using a wood plywood with a thickness as large as 12 to construct the wall. However, in this case, the maximum resistance of the wall is large, but fixtures such as steel frame anchor bolts and hole-down hardware that can withstand the load corresponding to the maximum strength are required. . This is because the Building Standards Law stipulates the strength of frames and fixtures that can support the maximum strength of structural panel materials. Therefore, in this case, there is a problem that the cost is increased.

Therefore, as shown in the curve L0 in FIG. 11, the load-deformation curve of the above-mentioned wall has passed the above-mentioned required value of the primary design and reached the required value of the secondary design. The deformation continues without changing Ideally, the requirement for the secondary design is not too large (about 1.5 times the requirement for the primary design). Hereinafter, this is called the “ideal curve”.

Conversely, by realizing a load-deformation curve that approximates such an ideal curve, it can be said that shear strength, vibration energy absorption, and low cost can be achieved. Disclosure of the invention

The present invention has been made in view of such conventional problems, and provides an inexpensive anti-fog wall which is excellent in shear strength and can sufficiently absorb vibration energy, and a steel house using the same. Attempt.

According to a first aspect of the present invention, there is provided an anti-fouling wall comprising: a steel frame formed by forming a shaped steel into a rectangular shape; and a structural surface material fixed to the steel frame. The cement-based inorganic material, the citric acid-containing substance, the lightweight aggregate, and the reinforcing fibers are dispersed in water to form a slurry, and the slurry is subjected to paper dehydration to form a single-layer mat. The single-layer mat is wound around a make-up roll, and a plurality of layers are laminated to a predetermined thickness to form a laminated mat. A load-bearing wall is made of a cement plate obtained by producing a press-mat and hardening and curing the press-mat (Claim 1).

Next, the operation and effect of the present invention will be described.

In the structural face material, since the lightweight aggregate and the reinforcing fiber are mixed with the raw materials, the strength per single-layer mat can be improved. Further, the structural face material is obtained by forming a laminated mat in which single-layer mats are laminated as described above. That is, since the above-mentioned structural face material is formed in a layer shape, it is excellent in shear strength and toughness.

As described above, the structural face material made of the cement board obtained by the above-described raw materials and methods has sufficient shear strength and sufficient toughness.

Since the structural wall material having the excellent shear strength and toughness is fixed to the steel frame body, the fender-resistant wall has a sufficient new strength and toughness. And, due to its excellent toughness, the above-mentioned wall can be relatively large in radius, and the inputted vibration energy can be sufficiently absorbed.

In addition, for the structural face material made of the cement plate, the maximum resistance is adjusted to a necessary and sufficient size by appropriately adjusting the number of layers and the thickness of the laminate when forming the laminated mat, for example. can do. That is, it is possible to prevent the maximum heat resistance from being excessively increased, and to prevent the necessity of extremely increasing the strength of the fixture such as the steel frame, the anchor bolt, and the hole-down hardware. Therefore, inexpensive anti-moisture walls and structural frames can be obtained.

In addition, with the above configuration, the load-deformation curve of the wall can be approximated to the ideal curve described above (see curve L0 in FIG. 11) (see Example 3). . In particular, by appropriately adjusting the number of laminations when forming the laminated mat, the load-deformation curve of the load-bearing wall can be approximated to the ideal curve.

As described above, according to the present invention, it is possible to provide an inexpensive anti-fog wall which is excellent in shear strength and capable of sufficiently absorbing vibration energy.

A second invention is a steel frame formed by forming a shape steel into a rectangular shape, A stino reno having a fender-resistant wall comprising a structural face material fixed to the steel frame,

The structural surface material is formed by dispersing a cement-based inorganic material, a citric acid-containing substance, a lightweight aggregate, and a reinforcing fiber in water to form a slurry. The mat is formed, the single-layer mat is wound on a make-up roll, and a plurality of layers are laminated to a predetermined thickness to form a laminated mat. The laminated mat is cut off from the making roll, A steel house comprising a cement plate obtained by molding to form a press mat and curing and curing the press mat (Claim 2).

The present steel house is made of a metal wall capable of realizing a load-deformation curve similar to the above-mentioned ideal curve (curve L 0 in FIG. 11) (see Example 3). BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a front view of a power-resistant wall in the first embodiment.

FIG. 2 is a side view of the heat-resistant wall in the first embodiment.

FIG. 3 is a top view of the power-resistant wall in the first embodiment.

FIG. 4 is a front view of the steel frame according to the first embodiment.

FIG. 5 is a side view of the steel frame according to the first embodiment.

FIG. 6 is a cross-sectional view taken along line AA of FIG.

FIG. 7 is an explanatory view of a flow-on type papermaking machine in Example 1. FIG. 8 is a perspective view of a part of the steel house in the first embodiment. FIG. 9 is an explanatory view of a honey-uck type papermaking machine in the second embodiment. FIG. 10 is an explanatory view of a shear tester in Example 3.

FIG. 11 is a diagram showing in-plane shear strength characteristics of various anti-fouling walls in Example 3. BEST MODE FOR CARRYING OUT THE INVENTION

In the first invention (Claim 1) or the second invention (Claim 2), the shape steel is, for example, a thin plate using a thin plate having a thickness of 0.8 to L: 6 mm. Steel can be used.

The cement-based inorganic material is, for example, one or more selected from Portland cement, blast furnace slag cement, fly ash cement, silica cement, alumina cement, white cement, and the like.

The above-mentioned caic acid-containing substance is, for example, one or more selected from slag, fly ash, K sand, K stone powder, silica fume, diatomaceous earth and the like.

The lightweight aggregate is, for example, one or two or more selected from perlite, permikilite, shirasu balloon, cement waste material and the like.

The reinforcing fibers include, for example, wood pulp (NUKP, NBKP, LUKP, LBKP, etc.), wood reinforcing fibers such as wood flour, wood fiber bundles, synthetic reinforcing fibers such as polypropylene fibers, vinylon fibers, and aramide fibers, and Sepiolai. And one or two or more selected from mineral reinforcing fibers such as urastonite.

In preparing the slurry, in addition to the cement-based inorganic material, the caicic acid-containing substance, the lightweight aggregate, and the reinforcing fibers, for example, a curing accelerator such as calcium formate or aluminum sulfate is used. Water, water repellents and the like may be dispersed therein, such as paraffin, paraffin, water and surfactants. The solid content of the slurry is preferably 5 to 20% by mass. Thereby, the predetermined thickness of the laminated mat can be efficiently obtained. When the above concentration is less than 5% by mass, the thickness of the single-layer mat is too thin, and it is necessary to laminate the multilayer to a predetermined thickness. Production efficiency may be reduced. On the other hand, when the content exceeds 20% by mass, the thickness of the single-layer mat is too large, so that the dewatering efficiency is reduced and the adhesion at the lamination interface may be reduced.

Furthermore, the structural surface material has a thickness of, for example, 10 to 15 thigh, specific gravity 0.8 to 1.1, is preferably a flexural strength 8 ~14N Z mm ^2. Preferably, the laminated mat is formed by laminating 5 to 10 single-layer mats. Example 1

A description will be given, with reference to FIGS. 1 to 8, of a power-resistant wall and a steel house using the same according to an embodiment of the present invention.

As shown in FIG. 1 to FIG. 3, the above-mentioned wall 1 is fixed to the steel frame 2 (FIG. 4 to FIG. 6) formed by forming a shape steel 21 into a rectangular shape. Structural surface material 3.

The structural face material 3 is made of a cement plate obtained as follows.

First, a slurry 41 is prepared by dispersing a cement-based inorganic material, a citric acid-containing substance, a lightweight aggregate, and a reinforcing fiber in water. As shown in FIG. 7, the slurry 41 is dewatered to form a single-layer mat. The single-layer mat is wound around a making roll 51, and a plurality of layers are laminated to a predetermined thickness to form a laminated mat 43. The laminated mat 43 is separated from the making roll 51. The laminated mat 43 is press-molded to produce a press mat, and the press mat is hardened and cured.

After that, by performing the outer shape processing and the like, the structural face material 3 made of the cement plate is obtained.

As the shaped steel 21, a thin, lightweight shaped steel using a thin plate having a thickness of about l.Omin is used. Then, as shown in Fig. 5 and Fig. 6, As the vertical members 211 in the vertical frame 2, C-shaped steel members having a substantially C-shaped cross section are used, and as the horizontal members 212 in the left-right direction, thin steel members having a substantially U-shaped cross section are used.

As shown in FIGS. 4 and 6, on the left and right sides of the steel frame 2, two vertical members 211 (C-shaped steel) are fixed with screws 11 with their backs overlapped. . Inside the lower left and right vertical members 211, a hole-down metal member 23 for fixing the wall 1 to the foundation is fixed.

In addition, a longitudinal member 211 (C-shaped steel) is disposed at a substantially central portion on the left and right of the steel frame 2.

As shown in FIG. 5, the cross members 212 (channel steel) are disposed on the upper side and the lower side of the steel frame 2 so that the opening surfaces thereof face each other. The horizontal member 212 and the vertical member 211 are fixed by screws 11.

As shown in FIGS. 1 to 3, the structural wall 3 is fixed to one side of the steel frame 2 to obtain the wall 1. That is, the structural face material 3 having substantially the same shape as the outer shape of the steel frame 2 is fixed to the steel frame 2 using screws 12.

Next, a method of manufacturing the structural face material 3 will be described in detail.

That is, first, 35% by mass of portland cement as the above cement-based inorganic material, 25% by mass of slag and 10% by mass of fly ash as the above-mentioned citric acid-containing substance, and 10% by mass of the above-mentioned lightweight aggregate 10% by mass of pearlite, 10% by mass of wood pulp as the above-mentioned reinforcing fiber, and 10% by mass of waste as a lightweight aggregate are mixed.

This raw material mixture is dispersed in water to form a slurry 41 having a solid content of about 12% by mass.

The slurry 41 is fed to the raw material pot of the mouth-on type paper machine 5 shown in FIG. Inject into Task 52. The papermaking machine 5 contacts the making roll 51, the raw material flow box 56, the suction box 57, and the lower part of the raw material flow box 56 and the suction box 57. And the felt 55 circulates while passing over the upper surface.

The slurry 41 put into the raw material pox 52 is supplied to a raw material flow box 56 and is flowed from the raw material flow box 56 onto the felt 55. The slurry 41 flowing on the felt 55 is dehydrated by suction by the suction box 57. As a result, a single-layer mat consisting of a thin layer of a raw material is formed on the felt 55.

The single-layer mat formed on the felt 55 in this manner is wound around the making roll 51 and laminated to form a laminated mat 43. Then, when seven layers of the single-layer mat are stacked, they are cut and developed by the cutter 59, and the stacked mat 43 is separated from the making roll 51. After that, the laminated mat 43 is press-molded into a press mat.

The press mat is hardened and cured at a temperature of 50 to 80 ° C and a humidity of 90 to 100 RH for 7 to 30 hours.

Thereafter, by performing an outer shape processing or the like, the structural face material 3 made of the cement plate is obtained. The structural face material 3 has a thickness of 10 to: L5nun, a specific gravity of 0.8 to 1.1, and a bending strength of 8 to 14 N Zmm ² .

Further, as shown in FIG. 8, a steel house 6 can be constructed by using a plurality of the above-mentioned wall 1 and assembling them.

Next, the operation and effect of this example will be described.

Since the above-mentioned structural face material 3 is obtained by mixing the above-mentioned lightweight aggregate and reinforcing fibers with the raw materials, the strength per one layer of the above single-layer mat is to be improved. Can be.

Further, the structural face material 3 is obtained by forming a laminated mat in which single-layer mats are laminated as described above. That is, since the structural surface material 3 is formed in a layer shape, it is excellent in shear strength and toughness.

As described above, the structural face material 3 made of the cement board obtained by the above-described raw materials and methods has sufficient shear strength and sufficient toughness.

Since the structural wall material 3 having excellent shear strength and toughness is fixed to the steel frame 2 as described above, the power-resistant wall 1 has sufficient shear strength and toughness. And, due to its excellent toughness, the above-mentioned wall 1 can be relatively large in radius and can sufficiently absorb the input vibration energy.

In addition, the structural face material 3 made of the cement plate is adjusted to have a maximum proof strength to a necessary and sufficient size by appropriately adjusting the number of layers and the plate thickness when forming the laminated mat. be able to. That is, it is possible to prevent the maximum power resistance from being excessively increased, and to prevent the necessity of extremely increasing the strength of the steel frame 2 and the screws 11, 12, and the like. Therefore, an inexpensive anti-moisture wall can be obtained.

Further, with the above configuration, the load-deformation curve of the wall 1 can be approximated to the ideal curve described above (curve L 0 in FIG. 11) (see Example 3). In particular, by appropriately adjusting the number of layers when forming the laminated mat, the load-deformation curve of the load-resistant wall 1 can be made closer to the ideal curve.

As described above, according to this example, it is possible to provide an inexpensive anti-moisture wall and a steel house which are excellent in shear strength and capable of sufficiently absorbing vibration energy.

Example 2 In this example, as shown in FIG. 9, a so-called Hachieck type paper machine 50 was used to manufacture the structural face material 3.

The papermaking machine 50 circulates between a making roll 51, a plurality of inlet boxes 54 in which a rotating cylinder 53 is disposed, and the making port 51 and the rotating cylinder 53 while contacting the same. Felt 55.

The slurry 41 charged into the raw material pox 52 of the papermaking machine 50 is supplied to each inlet box 54 and dehydrated on the outer peripheral surface of the rotary cylinder 53 to form a thin raw material layer. The layer of this raw material is adsorbed by the felt 55 to form a single-layer mat. The layers of the raw materials formed on the outer peripheral surfaces of the plurality of rotating cylinders 53 overlap on the felt 55.

The single-layer mat formed on the felt 55 in this way is wound around the making roll 51 and laminated to form a laminated mat 43. Then, when seven layers of the single-layer mat are stacked, they are cut and developed by the cutter 59, and the stacked mat 43 is separated from the making roll 51. After that, the laminated mat 43 is press-molded into a press mat.

Hereinafter, the structural face material 3 is manufactured in the same manner as in Example 1.

In other respects, the third embodiment is the same as the first embodiment, and this embodiment can provide the same operation and effect as the first embodiment.

Example 3

As shown in FIGS. 10 and 11, this example is an example in which the in-plane shear strength characteristics of the anti-fouling wall of the present invention were evaluated.

The power-resistant wall 1 used as a test body is that shown in Example 1 (FIGS. 1 to 3). The outer dimensions of the wall 1 are 3030 mm long and 910 mm wide. The front and rear width of the steel frame 2 is 92 mm, and the thickness of the structural face material 2 is 12 mm The fixing positions of the screws 12 are basically 150 mm apart from the left and right vertical members 211 and the upper and lower horizontal members 212 in the steel frame 2. In addition, the length of the vertical member 211 disposed substantially at the center of the left and right sides of the steel frame 2 is basically set to 300 mm. The diameter of the screw 12 is 4.2 mm.

The shear test method was in accordance with the Japan Construction Center Rating Book BCJ-LS-395 “KC Type Steel House Type A”.

Specifically, as shown in FIG. 10, the above-mentioned wall 1 is set on a shear tester 7. The shear tester 7 includes two fixed bases 71 and 72 disposed facing each other in front and rear, a movable pressing part 73 attached to one of the fixed bases 71 so as to be movable in the left-right direction, And a cylinder 74 for moving the part 73.

The movable pressing portion 73 applies a load leftward or rightward along the upper side 13 of the fender-resistant wall 1.

As a result, the wall 1 deforms so as to bend leftward or rightward. At this time, the load and the shear deformation angle were measured, and the relationship between the two was shown in the load-deformation curve shown in FIG. The load-deformation curve of the load-bearing wall 1 of the present invention is denoted by reference symbol L 1. In FIG. 11, the vertical axis represents the value obtained by dividing the load by the left and right widths of the wall 1 and the horizontal axis represents the shear deformation angle. The load on the vertical axis corresponds to the strength of the wall 1.

In FIG. 11, the ideal curve described above is denoted by reference symbol L0. In other words, it is a curve showing the deformation characteristics in which the deformation continues after passing the required value of the primary design and reaching the required value of the secondary design, without changing the proof stress.

Here, the required value of the above primary design is ll. OkNZ m, and the above secondary design is The design requirement is 16.5 kNZ m.

As shown in FIG. 11, the deformation curve L1 of the power-resistant wall 1 of the present invention is very close to the ideal curve L0. From this, it can be seen that according to the power-resistant wall 1 of the present invention, it is possible to secure the shear strength, secure the vibration energy absorption, and achieve a low cost.

Comparative example

This example is an example in which the in-plane shear strength characteristics of a fender-resistant wall using various other structural surface materials different from the product of the present invention were measured for comparison. The experimental method is as described in Example 3 above.

Comparative Sample 1 is an example in which a commonly used 9-ply wood plywood is used as a structural surface material.

Comparative Sample 2 is an example in which a 12.5 mm stone board was used as a structural surface material.

The comparative sample 3 is an example in which 12.5 mm wood plywood is used as a structural surface material, and the screw fixing interval on the outer periphery with respect to the steel frame 2 is 75 mm. For Comparative Example 3, a screw having a diameter of 4.8 mm was used.

Others are the same as the third embodiment.

The results of measuring the in-plane shear strength characteristics of Comparative Samples 1, 2, and 3 are shown in curves L21, L22, and L23 in FIG. 11, respectively.

That is, Comparative Sample 1 (curve L21) and Comparative Sample 2 (curve L22) were much lower than the required values of the primary design and the secondary design, and the maximum durability was insufficient. Then, a load-deformation curve greatly deviating from the ideal curve L0 was obtained.

Further, Comparative Sample 3 (curve L23) satisfies the requirements of the primary design and the secondary design, but has a very large maximum proof stress, and greatly deviates from the ideal curve LO.

Therefore, steel frames that can withstand this maximum strength T / JP2003 / 005287 A fixture such as anchor port and hole-down hardware is required, resulting in a problem of increased cost.

Example 4

This example is an example in which the physical properties of the structural face material used for the metal wall according to the present invention are compared with those of other cement boards.

That is, the bending amount and the specific gravity of the structural face material 2 shown in Example 1 were measured. The radius is a measure of the displacement of the central part of the specimen during rupture.

The measurement of the amount of radius was performed according to JIS A 1408, using a test specimen of 500 X 400 mm and a thickness of 12 mm.

For comparison, the same measurement was performed for Comparative Samples 4 and 5 below. For Comparative Sample 4, a raw material obtained by adding an appropriate amount of water to 75% by mass of cement and 25% by mass of wood chips was used as a template. A cement plate which was sprayed on and press-formed and manufactured by a so-called dry manufacturing method was used. That is, no light aggregate and no reinforcing fibers were added, and the product was not obtained by a wet process.

As the comparative sample 5, a cement plate having a three-layer structure composed of the front and back layers and the core material arranged therebetween by a dry manufacturing method was used. That is, a material obtained by adding an appropriate amount of water to a mixture of 40% by mass of cement, 25% by mass of sand, 15% by mass of wood chips, 5% by mass of wood powder, and 15% by mass of reject as the front and back layers is used. 35% by mass of cement, 20% by mass of sand, 10% by mass of wood fiber bundle, 5% by mass of wood chips, 28% by mass of reject, 2% by mass of expanded polystyrene beads It is a mixture of raw materials mixed with an appropriate amount of water.

In addition, each sample prepared and measured five pieces each (n = 5). Table 1 shows the measurement results. table 1

As can be seen from Table 1, the structural face material of the present invention has a large radius.

, Specific gravity is low. Since the amount of deflection is large, it can be considered that the structural face material has high toughness. Also, low specific gravity is thought to lead to high absorption and toughness of vibration energy. Industrial applicability

According to the present invention, it is possible to provide an inexpensive steel housing which is excellent in shear strength and can sufficiently absorb vibration energy.

Claims

The scope of the claims

1. A steel wall comprising a steel frame in which a shaped steel is framed in a rectangular shape, and a structural wall material fixed to the steel frame, wherein

The structural face material is prepared by dispersing a cement-based inorganic material, a caiecic acid-containing substance, a lightweight aggregate, and reinforcing fibers in water to form a slurry. The single-layer mat is wound on a make-up roll, and a plurality of layers are laminated to a predetermined thickness to form a laminated mat. The laminated mat is cut off from the above-mentioned making roll and pressed. A load-bearing wall comprising a cement plate obtained by molding to produce a press mat and hardening and curing the press mat.

2. A steel house having a steel wall having a rectangular frame of a shaped steel and a structural face material fixed to the steel frame, the steel house having a wall resistant to heat,

The structural surface material includes a cement-based inorganic material, a caicic acid-containing substance, a lightweight aggregate, and a reinforcing fiber dispersed in water to form a slurry. The single-layer mat is wound around a make-up roll, and a plurality of layers are laminated to a predetermined thickness to form a laminated mat. The laminated mat is cut off from the above-mentioned making cap and press-molded. A stinore house comprising a cement plate obtained by preparing a press mat by curing and curing the press mat.