JP2022144037A - Construction method of ligneous earthquake resisting wall and ligneous earthquake resisting wall - Google Patents

Abstract

To make it possible to reduce cost by reducing processing time as a result of omitting slit processing.SOLUTION: A construction method of ligneous earthquake resisting walls is composed of multiple CLT plates stacked in the out-of-plane direction. At least inserting holes of drift pins are opened at joining steel plate mounting positions of a CLT plate, bonded steel plates with through holes aligned with the insertion holes are sandwiched between the CLT plates, by inserting the drift pins into the holes, ligneous earthquake resisting walls between the joint steel plates are formed, and by connecting the joining metals attached to beams or columns and the joining steel plates, the ligneous earthquake resisting walls are erected.SELECTED DRAWING: Figure 5

Description

TECHNICAL FIELD The present invention relates to a method for constructing a wooden earthquake-resistant wall using CLT plates (cross-laminated timbers) for wall panels, and a wooden earthquake-resistant wall, and in particular, it is intended to reduce the time and cost of constructing the earthquake-resistant wall.

A wooden earthquake-resistant wall using cross laminated timber (hereinafter referred to as CLT plate) as a wall plate is known, and an earthquake-resistant building is constructed by connecting it to a beam-column structure via metal fittings.

Patent Literatures 1 to 5 describe techniques for incorporating wooden panels as seismic walls into beam-to-column structures of S and RC structures. All of these use a joining method called "steel plate insertion drift pin (DP) joining" as a joining method for transmitting seismic force to the wall. In this joining method, as shown in FIGS. 5 and 6, a slit 3 for inserting the steel plate 2 is constructed in the butt end of the CLT plate 1 with a circular saw 4 or the like, and after inserting the steel plate 2 into the slit 3, the CLT plate 1 and the CLT plate 1 are joined together. In this method, the drift pin 5 is inserted so as to weave the steel plate 2 . In both cases, drift pins 5 are inserted into the steel plate 2 and joined to be integrated with the frame 6, and the shear force is transmitted by the dowel action to resist the seismic force.

Specifically, the CLT plate 1 must be provided with a slit 3 along the central portion of the plate surface in the plate thickness direction for inserting a steel plate 2 of a predetermined size. It is not completed by one cutting, but it is repeated several times to increase the cutting depth and width to reach a predetermined size.

For example, in order to insert the steel plate 2 into the CLT plate 1, it was necessary to operate the circular saw 4 to make the slit 3. Normally, the radius of the circular saw is larger than the depth of the slit 3, but the cutting depth is limited to about 80 mm because the cutting resistance is large and the sawtooth is reduced. Therefore, cutting the slit 3 with a depth of about 120 mm requires three times of cutting, including two times of cutting and one final finishing cutting. In addition, the setting dimension of the saw tooth (tooth cutting width) is usually about 8 mm, so when inserting a 9 mm steel plate 2, the construction dimension is +2 mm, so it will be 11 mm, and it will be 2 times in the width direction, and the slit on the right side of the wall Six cutting processes are required for construction alone. Moreover, since the cost depends on the time required for cutting, the length of the slit 3 is also related.

In this way, the slit construction has a large effect on the wall production period and cost, so it is desirable to use the minimum size that ensures the performance of the wall. It is difficult to make it small conveniently, such as escape of .

JP 2018-188845 A Japanese Patent Application Laid-Open No. 2019-65685 JP 2020-101052 Japanese Patent Application Laid-Open No. 2019-119990 Japanese Patent Application Laid-Open No. 2019-196669

According to the above-mentioned conventional method, firstly, the slit provided in the butt end of the CLT plate is limited to about 80 mm by one cutting, and it is necessary to reach a predetermined size by increasing the cutting depth repeatedly several times. Therefore, if the steel plate to be inserted is large, it takes a long time for construction, resulting in an increase in cost. Secondly, in ordinary drift pin joining, since the steel plate is simply inserted into the slit, there are concerns about insufficient initial rigidity and brittle fracture at the joint, and the inherent performance of the CLT plate cannot be achieved. It may not be possible to fully demonstrate it.

The present invention has been made by paying attention to the above-mentioned conventional problems, and by superimposing two or more wall panels so that the slitting process is unnecessary, the processing time is shortened and the cost can be reduced. It is designed to form a single seismic wall.

In order to achieve the above object, a method for constructing a wooden earthquake-resistant wall according to the present invention is a method for constructing a wooden earthquake-resistant wall composed of a plurality of CLT plates stacked in an out-of-plane direction, wherein these CLT plates are joined together. An insertion hole for at least a drift pin is opened at a steel plate mounting position, a joined steel plate having an insertion hole aligned with the insertion hole is sandwiched between the CLT plates, and the drift pin is inserted into the hole to perform the joining. A wooden earthquake-resistant wall is formed with a steel plate sandwiched between them, and the steel earthquake-resistant wall is erected by connecting metal joints attached to beams or columns to the joint steel plate. In this case, a stiffening plate is interposed in a gap corresponding to the thickness of the joined steel plates, and the wooden earthquake-resisting wall is integrated with the stiffening plate by bolts passing through the CLT plate.

The wooden earthquake-resistant wall according to the present invention is a wooden earthquake-resistant wall formed by sandwiching a joint steel plate with a plurality of CLT plates stacked in the out-of-plane direction and joining them by drift pins to integrate them, and the CLT plates sandwiching the joint steel plate. is characterized in that a gap corresponding to the thickness of the joined steel plates is formed. In this case, the wooden earthquake-resisting wall is characterized by having a stiffening plate in the gap, which is fastened and fixed with a connecting bolt that penetrates the CLT plate and the stiffening plate.

With the configuration as described above, since slit processing is not required, the processing time can be shortened and the cost can be reduced. In addition, waste materials (chips) are reduced and the yield is improved. Furthermore, a heat insulating material or a sound absorbing material can be installed in the space between the stacked CLT plates, and wiring can also be performed.

FIG. 4 is a front view of a CLT plate that constitutes the wooden earthquake-resistant wall according to the present embodiment; FIG. 4 is a partial cross-sectional view of the wooden earthquake-resistant wall according to the present embodiment; It is a partial front view of the wooden earthquake-resisting wall according to the same embodiment. It is a perspective view of the steel plate for center joining and the steel plate for end part joining which are used for embodiment. FIG. 4 is a partial cross-sectional view showing the state of attachment of the wooden earthquake-resistant wall to the frame structure according to the present embodiment; It is a partial front view which shows the attachment state to the frame of the wooden earthquake-resistant wall which concerns on the same embodiment. FIG. 4 is an overall cross-sectional view showing the state of attachment of the wooden earthquake-resistant wall to the frame structure according to the present embodiment. It is an overall front view showing a mounting state of the wooden earthquake-resistant wall according to the same embodiment to the frame. FIG. 10 is a partial cross-sectional view of a conventional wooden earthquake-resistant wall in an attached state; It is the same partial front view. It is a front view which shows the processing state of the same wooden earthquake-resistant wall.

Hereinafter, a wooden earthquake-resistant wall construction method and a wooden earthquake-resistant wall according to embodiments of the present invention will be described in detail with reference to the drawings.
It should be noted that the embodiment shown below is merely an example, and includes all modifications as long as the gist of the invention is not changed.

This embodiment aims to streamline the construction of earthquake-resistant walls by eliminating the need for circular saw processing in the cutting process, shortening construction time, and reducing costs. Instead of using one CLT panel as a quake-resistant wall, the CLT panel equivalent to one quake-resistant wall is prepared by separating it into two CLT panels, which are connected to the frame by steel plates. It is to make one sheet of earthquake-resistant wall by pasting two CLT panels on both sides.
Therefore, as a method of solving this problem at once, "two-sheet combination" that does not require slit construction is effective.

The construction order of the seismic wall will be described below. Fig. 1 is a front view of the CLT plate 10, Figs. 2 and 3 are the seismic wall with steel plates interposed, Fig. 4 is a perspective view of the joining steel plates, and Figs. Fig. 4 is a diagram of states; Also, an overall view is shown in FIGS. 7 and 8. FIG.
First, two CLT plates 10 of the same size are prepared, and as shown in FIG. The CLT plate 10 is a cross-laminated timber, and its vertical and horizontal dimensions are determined according to the size of the wall plate to be manufactured, and the thickness is set to approximately 1/2 of the wall plate to be manufactured. there is A center joining steel plate 18 located in the center of the upper (lower) side and a pair of end joining steel plates 20, 20 located on both sides of the upper (lower) side can be attached to the CLT plate 10. Among the insertion holes 22 formed in the steel plates 18 and 20, the insertion holes 16 for the drift pins 12 are drilled at the same positions as the insertion holes 22 provided at positions corresponding to the embedded portions of the steel plates 18 and 20. is doing.

As shown in FIGS. 4 and 5 to 6, the end-bonded steel plate 20 is a rectangular steel plate having short sides protruding from the upper side of the CLT plate 10 and long sides along the side edges of the CLT plate 10. placed together. The central joint steel plate 18 has an inverted mountain shape obtained by obliquely cutting the lower corners of the sides of the rectangular plate, so to speak, in the shape of an inverted gable. is arranged so that the rectangular portion of the CLT plate 10 protrudes from the upper side portion of the CLT plate 10 . The protrusions from the upper (lower) side of the CLT plate of both steel plates 18 and 20 have the same height and the same thickness.

Next, the positions of the two CLT plates 10 are aligned, and the steel plates 18 and 20 having the insertion holes 22 are sandwiched between them, and the drift pins 12 and the bolts 14 are installed. Place one CLT plate 10 on the bottom, then place the center joining steel plate 18 in the center, place the end joining steel plates 20 on both sides, overlap the CLT plate 10 again on the upper surface, and insert them. The drift pin 12 is inserted into the hole 16, the insertion hole 22, and the insertion hole 16 in this order. stop. As a result, the separated CLT plates 10 are integrally joined to form the seismic wall 28 . The purpose of the bolts 14 is to maintain integrity after wall assembly and to stiffen buckling when compressive force acts on the steel plates 20 to be joined at the ends. The bolt holes in the steel plate 20 are made about 10 mm larger than the bolt diameter.

The earthquake-resisting wall 28 manufactured in the factory in this manner is brought to the site, placed in wall spaces provided above and below the beams 30 of the building, and the beams 30 are attached. Now, the case of attaching to the upper beam 30 will be described as an example. The upper beam 30 is made of H-shaped steel, and a pair of L-shaped joint metal fittings 36 are fixed to the lower surface of the flange 32 by bolts so as to be installed downward across the center extension line of the web 34 . The width dimension of the pair of L-shaped joining metal fittings 36 conforms to the width dimension of each of the joining steel plates 18 and 20 . The seismic wall 28 is attached to the L-shaped joint hardware 36 with bolts 38 through the central joint steel plate 18 and the end joint steel plates 20, as shown in FIGS. This is done by arranging one L-shaped joining metal fitting 36 in a row on one side flange 32 of the upper beam 30, erecting a seismic wall 28 thereon, and then joining the other L-shaped joining metal fitting 36 to the steel plate. 18 and 20 , bolted, set to the flange 32 of the upper beam 30 with bolts 38 , and incorporated into the frame 40 .

When the seismic wall 28 is divided into two pieces with the same thickness as compared to the case where the CLT plate 10 is one, the one CLT plate 10 becomes thinner and easily buckles against the axial force in the vertical direction. In such a case, as shown in FIGS. 7 and 8, a filler plate (stiffening plate) 42 is sandwiched at the center with a sandwich bolt 44 as a countermeasure. The bolt 44 portion may be provided with a recess 46 and an embedded wood 48 may be interposed.

When the CLT plates 10 are joined together, there will inevitably be a gap between the joining steel plates 18, but if necessary, it is possible to fill the gap between the two plates with a heat insulating material, a sound absorbing material, wiring, piping, and the like. If the size of the object to be sandwiched is larger than the thickness of the steel plate, it is possible to insert a filler plate (general part: structural plywood, joining steel plate part: steel plate) for adjustment.

Therefore, according to this embodiment, the following effects can be expected.
First, it reduces the processing cost. Conventionally, slits into which the joined steel plates are inserted must be processed multiple times, but according to the present invention, the CLT plates 10 are simply stacked with the joined steel plates 18 and 20 sandwiched therebetween, and the drift pins 12 are driven. Since only one step is required, slitting and the like can be omitted. Moreover, the processing time required for this can be shortened.

In addition, waste materials (chips) are reduced, the yield is improved, and resources can be effectively used. Furthermore, it is possible to insert a mechanism for heat insulation and sound absorption into the space between the CLT plates, and there is an advantage that wiring between panels is possible.

Furthermore, as in the present embodiment, in addition to two-layer stacking, it is theoretically possible to stack any number of layers, such as three-layer stacking, to easily increase yield strength. In terms of manufacturing, if the number of plates increases, the slit processing time will increase compared to a single plate, which will lead to an increase in cost, so the rationality of this embodiment is clear.

It can be applied to the construction of seismic walls.

10...CLT plate, 12...Drift pin, 14...Bolt, 16...Insertion hole, 18...Center joining steel plate, 20...End joining steel plate, 22...Insertion hole, 24...Stopping plate , 26... Nut, 28... Seismic wall, 30... Upper beam, 32... Flange, 34... Web, 36... L-shaped joint metal, 38... Bolt, 40... Frame, 42... Filler plate, 44--bolt, 46--seat carving, 48--filling wood.

Claims (4)

A method for constructing a wooden shear wall composed of a plurality of CLT plates stacked in an out-of-plane direction,
At least a drift pin insertion hole is opened at the joining position of the CLT plate,
A bonded steel plate having an insertion hole aligned with the insertion hole is sandwiched between the CLT plates,
forming a wooden earthquake-resistant wall with the joining steel plate sandwiched therebetween by inserting the drift pin into the insertion hole;
A method for constructing a wooden earthquake-resistant wall, wherein the earthquake-resistant wall is erected by connecting joining metal fittings attached to beams or columns to the joining steel plate. 2. The wooden earthquake-resistant wall according to claim 1, wherein a filler plate is interposed in a gap corresponding to the thickness of said joined steel plates, and said wooden earthquake-resistant wall is integrated with said filler plate by bolts penetrating said CLT plate together with said filler plate. How to build walls. A wooden earthquake-resisting wall formed by sandwiching a joint steel plate with a plurality of CLT plates stacked in the out-of-plane direction and connecting and integrating them with a drift pin,
A wooden earthquake-resisting wall characterized in that a gap corresponding to the thickness of said joined steel plates is formed between CLT plates sandwiching said joined steel plates. 4. The wooden earthquake-resisting wall according to claim 3, wherein a stiffening plate is provided in the gap, and the CLT plate and the stiffening plate are fastened and fixed by connecting bolts passing through the stiffening plate.

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