CA2131107C - Wood column-beam joint structure using lag screw bolts - Google Patents
Wood column-beam joint structure using lag screw bolts Download PDFInfo
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- CA2131107C CA2131107C CA 2131107 CA2131107A CA2131107C CA 2131107 C CA2131107 C CA 2131107C CA 2131107 CA2131107 CA 2131107 CA 2131107 A CA2131107 A CA 2131107A CA 2131107 C CA2131107 C CA 2131107C
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- small holes
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Abstract
A wood column-beam joint structure using lag screw bolts for joining a wood column member and wood beam members is disclosed. The lag screw bolts consisting of a lag screw section are screwed into the column member and both bolt sections provided at its ends are protruded beyond the side faces of the column member. Head sections of T-shaped gusset plates made of steel plate are fastened to the protruded bolt sections of the lag screw bolts by means of nuts and leg Sections of T-shaped gusset plates are fitted into slits provided at one end of each of the wood beam members. Drift-pins are fitted into the small holes provided in the leg sections of T-shaped gusset plate and the small through holes provided in the beam members corresponding thereto, thereby securing the leg sections of the T-shaped gusset plates and the wood beam members.
Description
2131~,0~' USING LAG SCREW BOLTS
B~~CKGROIJND OF THE INVENTION
Field of the Invention The present invent:.ion relates to a joint structure of wood column and wood beam, and more particularly to a joint structure for joining rigidly a column with a beam each having a large secl~ional area.
Description of the Related Art.
In recent years, large-scale wooden buildings have been constructed. However, svafficient ir.<ethod for realizing a rigid frame structure which does not need walls in both rigid and span directions has not yet been developed.
In order to realize a rigid frame as described above, one method has been developed in which double-end bolts are passed through a column oo join a column member tightly with a beam member. However, it is difficult to adopt this method actually be<;ause deep sticking of sectional area of the beam member int=o the side faces of the column member becomes a fatal drawback.
Another method hats :been also developed in which deformed bars are insertE~d into a column and beams, and then bided with adhesives. However, this method has such drawbacks that. a period of time for curing is needed upon execution and that control of the temperature and humidity is needed.
SUMMARY OF THE INVENTION
It is an obje~:t of the present invention to provide a - 2~31~.0'~
novel wood column-beam joint structure capable of joining a ridge direction with a span direction rigidly at the same time by means of wood, and capable of realizing a two-dimensional rigid f=rame :structure by a timber structure in the same manner as a steel frame construction and a reinforced concrete const=ruction.
It is another object of the present invention to provide a novel woe>d column-beam joint structure capable of giving a role of a final fixture material to the structure by using laminated materials having large sectional areas, thereby reducing a cost for Finishing the inside of a building and securing w:icte spaces halving a large degree of freedom.
According to one aspect of the present invention there is provided a wood columru--be<3m joint structure using lag screw bolts for joining a wood column member and wood beam members by means «f l.ag :;crew bolts and gusset plates, each of the lag screw belts consisting of a lag screw section and the bolt sections at. its end se<:tions, each of the gusset plates being made of steel. plate fo~:med into a T-shape, and having a plurality of through holes at its head section of T-shaped plate by virtue=~ of which t-ie bolt end sections of the lag screw bolts can ~>e fastened by nuts and a plurality of small holes into whic~ln drift-ping are fitted, wherein c>ne end of each of the beam members is provided with a slit into which c>~,c:h of the eq sections of T-shaped plates of the gus:~et plates arc, fit:..ed, and small through holes correspondin~~ r_o the plurality of small holes of each 213~.10'~
of the leg sectiona of T-shaped pl.at.es;
and wherein a plurality of the lag screw bolts are arranged side by side and horizontally screwed into the wood column member in such a way that each of bolt end sections thereof are protruded outside the column member; each of the bolt end sect_'~ons protruded outside the column member are passed through the through holes of each of the head sections of 'T--shaped planes of the gusset plates and secured to the wood column member by means of nuts; each of the leg sections of 'T--shaped plates of the gusset plates are fitted into each of the s7_its of the beam member; and drift-pins for transmitting sruear.ing force are fitted into the small holes of the l.eg sections of T-shaped relates and small through holes of the bears members corresponding thereto.
In the constitution as describ<~d above, a gusset plate comprising two rectangular steel plates each having a thickness from ten and several mm t~o several tens mm got butted against eacr~ oth~~u so as to :>e formed in T-shape and welded with a double beve-w groove welding may be preferably used. The leg section of the T-shad>ed plate is generally fitted vertically into <~ slit formed in the beam member.
The lag screw bolts should support the gusset plate securely at several points. To cope with this, through holes are usually provided at least near the four corner of the head section of the T-shaped plate, and :four lag screw bolts passing through these through holes are arranged side by side such that they are s.c:rewed into the column member.
However, the number of t=1-.e lag screw bolts is not limited, - 213110' and more of the lag screws (usually even number, such as six or eight) may be used too provide sections secured by the lag screw bolts. The lag screw bolt to be used in the present invention varies i:~ acc:ordance with the size of the adopted column member and -she beam member. However, a lag screw bolt which comprisE=s a shaft of a round steel bar having a diameter of about 20 mnu to 90 mm threaded, for example, in the form of a lag :crew with a root diameter of 2.7 cm, a thread diameter of 3.5 cm and a thread angle of 60°, and ends sections threaded a~~cording to M27 specifications, as an example as described Later is generally used. The lag screw bolt to be used is not limited thereto.
In the constitution as described above, one bolt section may be provided at one end of the lag screw bolt to be secured with the gusset plate, thereby joining one beam member with the co__umn member. And, two bolt sections may be provided at both ends of the lag screw bolt to pass through the ~~olumn member, thereby t.wo beam members are joined with the both ends, respectively. Further, a group of lag screw bolts may be buried in the column member and arranged side by side, anc~ other: group of lag screw bolts may also be btried in the column member in such a manner that these twc> gro~.ips of lag screw Molts cross at a right angle, thereby the beam rlembers are joined with one column member in three o:r four dimensions.
The small holes of i=lze leg section of T-shaped plate into which drift-pins are fitted anc~ the small holes of the beam member c;orresr~onding thereto should be formed in number capable of fitting a sufficient number of the drift-pins thereinto for bearing a shearing force. As a typical example, a number of these small holes may be preferably formed at equal intervals along circumferences of concentric double ~~ircles.
Any type' of drift-pin may be used as long as it can bear shearing force between the beam member and the gusset plate. P. steel pin having a diameter of 8 mm to 22 mm, preferab_Ly 14 mm to 19 mm may be used. The small holes ~~f the :Leg section of T-shaped plate and the small throug:z holes of the beam member corresponding thereto are Formed so as to have diameters for driving the drift-pins to be fitted closely thereinto.
A laminated material or the like, for example, Oregon pine :Laminat:e~d wood may be used as the column member and the beam member to be joined according to the present invention, but they are not limited to this material. For example, a laminated veneer lumber (LVL) and PSL, so called engineering wood, may be used.
Therefore, in accordance with the present invention, there i~> provided a joint structure for use in construction, comprising:
a first wooden member;
a second wooden member provided at one end with a slit and further provided with a plurality of first small holes;
a plurality of lag screw bolts each including a threaded 1<<g scre:w portion and a bolt portion at an end section;
at least one steel gusset plate having a T-shape with a head portion and a leg portion connected thereto, a plurality of through holes being formed in said head portion, a plurality of second small holes being provided in said leg portion, said leg portion being inserted into said slit so that said second small holes are aligned with respective ones of said first small holes; and -5a- 2131107 a plura:L.ity of shear-force-transmitting drift pins inserted through respective ones of said first small holes and through aligned ones of said second small holes, staid lag screw bolts being disposed side by side and screwed into said first wooden member so that the bolt portions of said lag screw bolts protrude outside said first wooden member, the bolt portions of said lag screw bolts extending through the through holes of said head port:io n, said head portion being secured to said first wooden member by means of respective nuts.
A:Lso in accordance with the present invention, there is provided a joint structure for use in construction, comprising:
a first wooden member;
a second wooden member provided at one end with a slit ;end further provided with at least five first small holes equispaced along a first circumference;
a plurality of bolts:
at: least one steel gusset plate having a T-shape with a head portion and a leg portion connected thereto, a p_Luralit:y of through holes being formed in said head portion, at least five second small holes being provided in raid leg portion, said leg portion being inserted into said slit and said second small holes being equispaced a_.ong a second circumference so that said second small holes are aligned with respective ones of said first small holes; and at least five shear-force-transmitting drift pins inserted through respective ones of said first small holes and through a.l.igned ones of said second small holes, said bolts being disposed side by side and screwed into said first wooden member so that end portions of ;aid bolts protrude outside said first wooden member and exaend through the through holes of said head - 5b- 2131107 portion, said bolts being secured to said first wooden member by means of nuts.
BRIEF DESCRIPTION OF THE DRAWINGS
f.ig. 1(a) is a front view of a column member of the present invention seen from the direction of through. holes;
F_ig. 1(k>j is a side view of the column member;
Fig. 2(a) is a general view of a lag screw bolt of the present invention;
F_Lg. 2(b) is a partially enlarged view thereof;
F_Lg. 3(a) is a front view of a beam member of the present invention;
- 213110' Fig. 3(b1 is a side view thereof;
Fig. 3 (c) is <~ plan view thereof;
Fig. 4 shows a condition where four lag screw bolts are screwed in the column member and both ends of the lag screw bolts are protruded beyond both side faces of the column member;
Fig. 5(a) is a froni_ view of a gusset plate of the present invention;
Fig. 5(b) is ~r side view thereof seen from a head section of T-shaped plate;
Fig. 5 (~~) is ~r plan view of the gusset plate;
Fig. 6 is a development. showin<~ a column-beam joint structure of the present ~:.nvent.ion in which the column member is joined with the beam members by means of the lag screw bolts and the gusset plates; and Fig. 7 sl-:ows ,outline of a devi<~e used for strength test of the column-beam stru~~ture.
DESC:RIPT7:OT1 C:!F THE PREFERRED EMBODIMENTS
A joint structure ~:~ccorc~ing to the present invention will be describeel .in furtluer detail by way of embodiment with reference to ttie a:~<_c>mpanying drawings and results of a strength test.
Embodiment 1 Figs. 1 (a) anc3 1 (b) show a column member 1. In this embodiment, three :~heet,~ <~f C>regon pine laminated lumber 101 to 103 (15 cm x. 95 cm) were subjected to the :>econdary bonding to fc>rm the col~.arrr: member 1 having a predetermined 'shape, i.e. 950 mm squar_~e and a length of 9,110 mm. Four through holes (pre-holes) 104 each having a diameter of 27 mm were formed at the positions shown in the figures (two of them are positioned at 1401 mm from the end of the column member and the rest of two are 2111 mm from the same, respectively). Fig. 1(a) is a front view of the column member 1 seen from the direction of the through holes, and Fig. 1(b) is a side view thereof.
Figs . 2 (a) and 2 (l:>) show a lack screw bolt 2 . In this embodiment, the la~~ sci:ew bolt 2 comprises a shaft 201 threaded in the farm ofa lag screw having a length corresponding to a width of the column member 1, thread diameter of 3.5 cm, a root diameter of 2.7 cm, a thread angle of 60° and a pitch of 10 mm; ;end two bolt sections each having a lengt-.h of ~ cm provided at the ends of the lag screw bolt 2 t=o protrude beyond the column member 1 when the shaft 201 is screwed ir. t_he column n;ember 1. The bolt sections are threaded according to M27 bolt specifications.
The lag screw bolts 2 are screwed into the through holes 104 of the column member 1 having a diameter of 27 mm using a torque wrench in sur_h a rnanner that. both ends thereof protrude beyand the column nu=tuber 1. Fig. 2(a) is a general drawing of the lag screw bolt 2; anc_1 Fig. 2(b) is a partially enlarged view of thereof.
Figs. 3(a) to 3(c) show a beam member 3 (2616 mm x 200 mm x 800 mm) made c>f Oregan pine laminated lumber. About 800 mm length of slit having a thickness of 11 mm and a number of thrc~ugh holes (pre-ruoles) 302 into which steel drift-pins each having a cfi.arneter of' 18 mm can be driven 213110' circumferent.ially are provided at c:>ne end of the beam member 3. Two stepped seCtlons 303 are provided at the corner portions of one end of the beam member 3 in order to secure spaces for fastening gusset plates 4 described later to the end sections, protruded beyond the column member 1, of the lag screw bolts 2 by means of nuts. Fig. 3(a) is a front view of the beam membeY 3; Fig. 3(Y~) is a side view thereof;
and Fig. 3(c) is <r plan view thereof.
Fig. 9 shows a condition wherE:~ fo~zr bolt sections of the lag screw bolt 2 threaded accomc~in<~ to M 2.7 bolt specifications each havi.nq length of 5 cm are protruded beyond the both side faces of the column member 1.
Figs. 5 (a) to; 5 (c~) show a 'f-st:~aped gusset. plate 4 . The gusset plate 9 com;~~r:ises a head section of T-shaped plate (end plate) 401 made of steel plate having a rectangular shape of 790 mm height by 200 mm wide and a thickness of 14 mm; and a Leg section of T-shared ).late 902 made of steel plate having <~ rec'~angular shape of 790 rnm height by 790 mm wide and a thickness of 9 mm which is butt welded with a double bevel. groovf-, ~~aelding to be fired to the head section 401. The head section of T-shaped plate 401 has hour through holes 403 eact= having a diameter of 30 mm at four corners thereof . In the leg secti.c.~rn c>f f-shaped plate, 16 small holes 409 each having a diameter of 18 mm are formed at equal intervals along each of circumf«rencer~ of the inner and outer conc;entr:i_c circled> rlaving rac:3:i i 260 nun and 323 mm, respectively. Fic:. 5(a) is a front vieew of the gusset plate 4; Fig. 5(b) i.s a side view thereof seen from the head 213110' section of T-shaped plate; and Fig. 5(c) is a plan view of the gusset plate 9.
Fig. 6 is a development showing a column-bean joint structure of t=he column member 1 and the beam members 3 as described above by means of the lag screw bolts 2 and the gusset plates 9. In this embodiment., four lag screw bolts are arranged ~>ide by sidEe along two crossing dimensions, respectively, to (~~~ss th:.~c>ugku tre column 1, and the beam members 3 arE:, jointed to :respective ends> of the bolts through the gusset elates 9. In otk~er words, the bolt sections 202 of four lag :~crevl bolt: 2 screwed in and fixed to the column member 1 ar_e pa~,sed tkirough the through holes 903 of the gnsset_ k:late 4 to be fastened key means of nuts, thereby fixing the gu:~set, p7atee:; to the> c~oli.zmn member. And, the lag section of T-sh<3r><ed l:~lat.e 9)2 is inserted into the slits 301 of the koeam member 3, and then the drift pins each having a diameter c~f 1.8 mm are driven into the small holes 404 of the gusset ylate:=~ 'I and the throuGh holes 302 of the beam member 3 corrwsponc~ing thereto to fix them, thereby finishing joint of the cc>lu mn member 1 and the beam members 3.
In this embodiment, lower surf~:aces of ends of the lag screw bolt protruded beyc:nd the column member is covered with a U-shaloed fir~c:-re~~i~,tant cover:; (laminat.ed material) .
Strength Test With respect t:o tce column-beam joint structure constituted ' s de sc;r ibec:l ak:~ove, test s<~mr~l es 1 to 3 of column-beam crossing were produced. The heights of the beam _ 2133.10' of these samples were 500 mm, 650 mm, and 800 mm, respectively. These sarr~ples were subjected to a strength test (Fig. 7) in which W bration in left and right directions was re~oeatedly given to the column member with a condition desr_ribed be?.ow. A lower end of the column member and outer ends of the beam members were supported by hinges, respectively.
Conditions of Test.:
Amplitu<~e of left ar,%~ rigrnt v:bration...20 mm by 20 mm in left and right ~irec:tions at beginning, and increased with ~~2 tunes by ~~:? time.7 thereafter: unr_il 245 mm by 295 mm in left and right ~~irec:tions.
Number of rer:~e~at of vibration . . . 8 t imes Form the results of the test., it ~,~as revealed that sticking of the he~.~c~ section of T-shaped plate 401 into the side faces of the col.unvn did not occur at all in the beginning and that t:hF: joint caused remarkably less deformation of the column and the beam compared with a conventional joining method whi.~~~h caused large deformation of the same.
As regards tree break ef tlme te~:~t samples, in case of the test same>__e 1 .Iavirg a heig>ut o~ the beam member of 500 mm, draft-pin Joint. ~:ect:i~:~ns at the beam member were broken.
In case of the tes;: samp:Les 2 and 3, they were broken in such a manner treat lag screw bolts 2 ~.aere pulled out from the column. The proof stresses upon break were remarkably increased compared with a cornventiorial joint method which caused large deformation <iue to sticking.
_ 2~3~10"~
From the results as described above, it was proved that the column-beam stru~:aure having high strength and toughness calaable of being easily e;ecuted in a construction field and of reducr_ng a initial deformation could be constituted.
The feature of the i~resent= invention offers the following adv~.mta<~e:~
The joint structure causing no sticking of the beam into the side= fac~~~> of t.hfe column antis less deformation, and having excellent strength can be proviesed;
The col-nmr~ a:~<~ the heam each Yuaving a 1 urge structure can be joined rigidly in <~ very simp7.e method, both ridge and span d.irec:t.ions can be joiners rigidly at the same time, and a two-d.ime~nsional r:i.gid frame si: ruct lire which is quite same as a steel fr~~mc: corustructicn nc~ ~ reinforced concrete construction c:an he ieali<,ec~ by a timber structure;
A cost fc>r finishing the insiesF-' of the building constructed Faith tree joint. method of the present. invention can be reducee; and wide ~>l:>ace>s having a l arge degree of freedom can be secured becau:>e the ~_:onstitution material of the laminated matemia7s having larga sectional areas perform the role of final Ii~:ti~rc~ mat=erials; anc As compared with a joint. :>truci'ure ~n wh_i.c:h deformed bars are inser-:.e<~ into a ccclumn and beams, and then bided with adhe:,i.vr s, ire s s not necces~>ary to secure a period of time of curing for ~~c:~n<sincs upon Ee xecut ion and to control the temperatlare anc hum.ic=city, tlmrel>y remarkably reducing a period of time for constructing a b~lilding.
B~~CKGROIJND OF THE INVENTION
Field of the Invention The present invent:.ion relates to a joint structure of wood column and wood beam, and more particularly to a joint structure for joining rigidly a column with a beam each having a large secl~ional area.
Description of the Related Art.
In recent years, large-scale wooden buildings have been constructed. However, svafficient ir.<ethod for realizing a rigid frame structure which does not need walls in both rigid and span directions has not yet been developed.
In order to realize a rigid frame as described above, one method has been developed in which double-end bolts are passed through a column oo join a column member tightly with a beam member. However, it is difficult to adopt this method actually be<;ause deep sticking of sectional area of the beam member int=o the side faces of the column member becomes a fatal drawback.
Another method hats :been also developed in which deformed bars are insertE~d into a column and beams, and then bided with adhesives. However, this method has such drawbacks that. a period of time for curing is needed upon execution and that control of the temperature and humidity is needed.
SUMMARY OF THE INVENTION
It is an obje~:t of the present invention to provide a - 2~31~.0'~
novel wood column-beam joint structure capable of joining a ridge direction with a span direction rigidly at the same time by means of wood, and capable of realizing a two-dimensional rigid f=rame :structure by a timber structure in the same manner as a steel frame construction and a reinforced concrete const=ruction.
It is another object of the present invention to provide a novel woe>d column-beam joint structure capable of giving a role of a final fixture material to the structure by using laminated materials having large sectional areas, thereby reducing a cost for Finishing the inside of a building and securing w:icte spaces halving a large degree of freedom.
According to one aspect of the present invention there is provided a wood columru--be<3m joint structure using lag screw bolts for joining a wood column member and wood beam members by means «f l.ag :;crew bolts and gusset plates, each of the lag screw belts consisting of a lag screw section and the bolt sections at. its end se<:tions, each of the gusset plates being made of steel. plate fo~:med into a T-shape, and having a plurality of through holes at its head section of T-shaped plate by virtue=~ of which t-ie bolt end sections of the lag screw bolts can ~>e fastened by nuts and a plurality of small holes into whic~ln drift-ping are fitted, wherein c>ne end of each of the beam members is provided with a slit into which c>~,c:h of the eq sections of T-shaped plates of the gus:~et plates arc, fit:..ed, and small through holes correspondin~~ r_o the plurality of small holes of each 213~.10'~
of the leg sectiona of T-shaped pl.at.es;
and wherein a plurality of the lag screw bolts are arranged side by side and horizontally screwed into the wood column member in such a way that each of bolt end sections thereof are protruded outside the column member; each of the bolt end sect_'~ons protruded outside the column member are passed through the through holes of each of the head sections of 'T--shaped planes of the gusset plates and secured to the wood column member by means of nuts; each of the leg sections of 'T--shaped plates of the gusset plates are fitted into each of the s7_its of the beam member; and drift-pins for transmitting sruear.ing force are fitted into the small holes of the l.eg sections of T-shaped relates and small through holes of the bears members corresponding thereto.
In the constitution as describ<~d above, a gusset plate comprising two rectangular steel plates each having a thickness from ten and several mm t~o several tens mm got butted against eacr~ oth~~u so as to :>e formed in T-shape and welded with a double beve-w groove welding may be preferably used. The leg section of the T-shad>ed plate is generally fitted vertically into <~ slit formed in the beam member.
The lag screw bolts should support the gusset plate securely at several points. To cope with this, through holes are usually provided at least near the four corner of the head section of the T-shaped plate, and :four lag screw bolts passing through these through holes are arranged side by side such that they are s.c:rewed into the column member.
However, the number of t=1-.e lag screw bolts is not limited, - 213110' and more of the lag screws (usually even number, such as six or eight) may be used too provide sections secured by the lag screw bolts. The lag screw bolt to be used in the present invention varies i:~ acc:ordance with the size of the adopted column member and -she beam member. However, a lag screw bolt which comprisE=s a shaft of a round steel bar having a diameter of about 20 mnu to 90 mm threaded, for example, in the form of a lag :crew with a root diameter of 2.7 cm, a thread diameter of 3.5 cm and a thread angle of 60°, and ends sections threaded a~~cording to M27 specifications, as an example as described Later is generally used. The lag screw bolt to be used is not limited thereto.
In the constitution as described above, one bolt section may be provided at one end of the lag screw bolt to be secured with the gusset plate, thereby joining one beam member with the co__umn member. And, two bolt sections may be provided at both ends of the lag screw bolt to pass through the ~~olumn member, thereby t.wo beam members are joined with the both ends, respectively. Further, a group of lag screw bolts may be buried in the column member and arranged side by side, anc~ other: group of lag screw bolts may also be btried in the column member in such a manner that these twc> gro~.ips of lag screw Molts cross at a right angle, thereby the beam rlembers are joined with one column member in three o:r four dimensions.
The small holes of i=lze leg section of T-shaped plate into which drift-pins are fitted anc~ the small holes of the beam member c;orresr~onding thereto should be formed in number capable of fitting a sufficient number of the drift-pins thereinto for bearing a shearing force. As a typical example, a number of these small holes may be preferably formed at equal intervals along circumferences of concentric double ~~ircles.
Any type' of drift-pin may be used as long as it can bear shearing force between the beam member and the gusset plate. P. steel pin having a diameter of 8 mm to 22 mm, preferab_Ly 14 mm to 19 mm may be used. The small holes ~~f the :Leg section of T-shaped plate and the small throug:z holes of the beam member corresponding thereto are Formed so as to have diameters for driving the drift-pins to be fitted closely thereinto.
A laminated material or the like, for example, Oregon pine :Laminat:e~d wood may be used as the column member and the beam member to be joined according to the present invention, but they are not limited to this material. For example, a laminated veneer lumber (LVL) and PSL, so called engineering wood, may be used.
Therefore, in accordance with the present invention, there i~> provided a joint structure for use in construction, comprising:
a first wooden member;
a second wooden member provided at one end with a slit and further provided with a plurality of first small holes;
a plurality of lag screw bolts each including a threaded 1<<g scre:w portion and a bolt portion at an end section;
at least one steel gusset plate having a T-shape with a head portion and a leg portion connected thereto, a plurality of through holes being formed in said head portion, a plurality of second small holes being provided in said leg portion, said leg portion being inserted into said slit so that said second small holes are aligned with respective ones of said first small holes; and -5a- 2131107 a plura:L.ity of shear-force-transmitting drift pins inserted through respective ones of said first small holes and through aligned ones of said second small holes, staid lag screw bolts being disposed side by side and screwed into said first wooden member so that the bolt portions of said lag screw bolts protrude outside said first wooden member, the bolt portions of said lag screw bolts extending through the through holes of said head port:io n, said head portion being secured to said first wooden member by means of respective nuts.
A:Lso in accordance with the present invention, there is provided a joint structure for use in construction, comprising:
a first wooden member;
a second wooden member provided at one end with a slit ;end further provided with at least five first small holes equispaced along a first circumference;
a plurality of bolts:
at: least one steel gusset plate having a T-shape with a head portion and a leg portion connected thereto, a p_Luralit:y of through holes being formed in said head portion, at least five second small holes being provided in raid leg portion, said leg portion being inserted into said slit and said second small holes being equispaced a_.ong a second circumference so that said second small holes are aligned with respective ones of said first small holes; and at least five shear-force-transmitting drift pins inserted through respective ones of said first small holes and through a.l.igned ones of said second small holes, said bolts being disposed side by side and screwed into said first wooden member so that end portions of ;aid bolts protrude outside said first wooden member and exaend through the through holes of said head - 5b- 2131107 portion, said bolts being secured to said first wooden member by means of nuts.
BRIEF DESCRIPTION OF THE DRAWINGS
f.ig. 1(a) is a front view of a column member of the present invention seen from the direction of through. holes;
F_ig. 1(k>j is a side view of the column member;
Fig. 2(a) is a general view of a lag screw bolt of the present invention;
F_Lg. 2(b) is a partially enlarged view thereof;
F_Lg. 3(a) is a front view of a beam member of the present invention;
- 213110' Fig. 3(b1 is a side view thereof;
Fig. 3 (c) is <~ plan view thereof;
Fig. 4 shows a condition where four lag screw bolts are screwed in the column member and both ends of the lag screw bolts are protruded beyond both side faces of the column member;
Fig. 5(a) is a froni_ view of a gusset plate of the present invention;
Fig. 5(b) is ~r side view thereof seen from a head section of T-shaped plate;
Fig. 5 (~~) is ~r plan view of the gusset plate;
Fig. 6 is a development. showin<~ a column-beam joint structure of the present ~:.nvent.ion in which the column member is joined with the beam members by means of the lag screw bolts and the gusset plates; and Fig. 7 sl-:ows ,outline of a devi<~e used for strength test of the column-beam stru~~ture.
DESC:RIPT7:OT1 C:!F THE PREFERRED EMBODIMENTS
A joint structure ~:~ccorc~ing to the present invention will be describeel .in furtluer detail by way of embodiment with reference to ttie a:~<_c>mpanying drawings and results of a strength test.
Embodiment 1 Figs. 1 (a) anc3 1 (b) show a column member 1. In this embodiment, three :~heet,~ <~f C>regon pine laminated lumber 101 to 103 (15 cm x. 95 cm) were subjected to the :>econdary bonding to fc>rm the col~.arrr: member 1 having a predetermined 'shape, i.e. 950 mm squar_~e and a length of 9,110 mm. Four through holes (pre-holes) 104 each having a diameter of 27 mm were formed at the positions shown in the figures (two of them are positioned at 1401 mm from the end of the column member and the rest of two are 2111 mm from the same, respectively). Fig. 1(a) is a front view of the column member 1 seen from the direction of the through holes, and Fig. 1(b) is a side view thereof.
Figs . 2 (a) and 2 (l:>) show a lack screw bolt 2 . In this embodiment, the la~~ sci:ew bolt 2 comprises a shaft 201 threaded in the farm ofa lag screw having a length corresponding to a width of the column member 1, thread diameter of 3.5 cm, a root diameter of 2.7 cm, a thread angle of 60° and a pitch of 10 mm; ;end two bolt sections each having a lengt-.h of ~ cm provided at the ends of the lag screw bolt 2 t=o protrude beyond the column member 1 when the shaft 201 is screwed ir. t_he column n;ember 1. The bolt sections are threaded according to M27 bolt specifications.
The lag screw bolts 2 are screwed into the through holes 104 of the column member 1 having a diameter of 27 mm using a torque wrench in sur_h a rnanner that. both ends thereof protrude beyand the column nu=tuber 1. Fig. 2(a) is a general drawing of the lag screw bolt 2; anc_1 Fig. 2(b) is a partially enlarged view of thereof.
Figs. 3(a) to 3(c) show a beam member 3 (2616 mm x 200 mm x 800 mm) made c>f Oregan pine laminated lumber. About 800 mm length of slit having a thickness of 11 mm and a number of thrc~ugh holes (pre-ruoles) 302 into which steel drift-pins each having a cfi.arneter of' 18 mm can be driven 213110' circumferent.ially are provided at c:>ne end of the beam member 3. Two stepped seCtlons 303 are provided at the corner portions of one end of the beam member 3 in order to secure spaces for fastening gusset plates 4 described later to the end sections, protruded beyond the column member 1, of the lag screw bolts 2 by means of nuts. Fig. 3(a) is a front view of the beam membeY 3; Fig. 3(Y~) is a side view thereof;
and Fig. 3(c) is <r plan view thereof.
Fig. 9 shows a condition wherE:~ fo~zr bolt sections of the lag screw bolt 2 threaded accomc~in<~ to M 2.7 bolt specifications each havi.nq length of 5 cm are protruded beyond the both side faces of the column member 1.
Figs. 5 (a) to; 5 (c~) show a 'f-st:~aped gusset. plate 4 . The gusset plate 9 com;~~r:ises a head section of T-shaped plate (end plate) 401 made of steel plate having a rectangular shape of 790 mm height by 200 mm wide and a thickness of 14 mm; and a Leg section of T-shared ).late 902 made of steel plate having <~ rec'~angular shape of 790 rnm height by 790 mm wide and a thickness of 9 mm which is butt welded with a double bevel. groovf-, ~~aelding to be fired to the head section 401. The head section of T-shaped plate 401 has hour through holes 403 eact= having a diameter of 30 mm at four corners thereof . In the leg secti.c.~rn c>f f-shaped plate, 16 small holes 409 each having a diameter of 18 mm are formed at equal intervals along each of circumf«rencer~ of the inner and outer conc;entr:i_c circled> rlaving rac:3:i i 260 nun and 323 mm, respectively. Fic:. 5(a) is a front vieew of the gusset plate 4; Fig. 5(b) i.s a side view thereof seen from the head 213110' section of T-shaped plate; and Fig. 5(c) is a plan view of the gusset plate 9.
Fig. 6 is a development showing a column-bean joint structure of t=he column member 1 and the beam members 3 as described above by means of the lag screw bolts 2 and the gusset plates 9. In this embodiment., four lag screw bolts are arranged ~>ide by sidEe along two crossing dimensions, respectively, to (~~~ss th:.~c>ugku tre column 1, and the beam members 3 arE:, jointed to :respective ends> of the bolts through the gusset elates 9. In otk~er words, the bolt sections 202 of four lag :~crevl bolt: 2 screwed in and fixed to the column member 1 ar_e pa~,sed tkirough the through holes 903 of the gnsset_ k:late 4 to be fastened key means of nuts, thereby fixing the gu:~set, p7atee:; to the> c~oli.zmn member. And, the lag section of T-sh<3r><ed l:~lat.e 9)2 is inserted into the slits 301 of the koeam member 3, and then the drift pins each having a diameter c~f 1.8 mm are driven into the small holes 404 of the gusset ylate:=~ 'I and the throuGh holes 302 of the beam member 3 corrwsponc~ing thereto to fix them, thereby finishing joint of the cc>lu mn member 1 and the beam members 3.
In this embodiment, lower surf~:aces of ends of the lag screw bolt protruded beyc:nd the column member is covered with a U-shaloed fir~c:-re~~i~,tant cover:; (laminat.ed material) .
Strength Test With respect t:o tce column-beam joint structure constituted ' s de sc;r ibec:l ak:~ove, test s<~mr~l es 1 to 3 of column-beam crossing were produced. The heights of the beam _ 2133.10' of these samples were 500 mm, 650 mm, and 800 mm, respectively. These sarr~ples were subjected to a strength test (Fig. 7) in which W bration in left and right directions was re~oeatedly given to the column member with a condition desr_ribed be?.ow. A lower end of the column member and outer ends of the beam members were supported by hinges, respectively.
Conditions of Test.:
Amplitu<~e of left ar,%~ rigrnt v:bration...20 mm by 20 mm in left and right ~irec:tions at beginning, and increased with ~~2 tunes by ~~:? time.7 thereafter: unr_il 245 mm by 295 mm in left and right ~~irec:tions.
Number of rer:~e~at of vibration . . . 8 t imes Form the results of the test., it ~,~as revealed that sticking of the he~.~c~ section of T-shaped plate 401 into the side faces of the col.unvn did not occur at all in the beginning and that t:hF: joint caused remarkably less deformation of the column and the beam compared with a conventional joining method whi.~~~h caused large deformation of the same.
As regards tree break ef tlme te~:~t samples, in case of the test same>__e 1 .Iavirg a heig>ut o~ the beam member of 500 mm, draft-pin Joint. ~:ect:i~:~ns at the beam member were broken.
In case of the tes;: samp:Les 2 and 3, they were broken in such a manner treat lag screw bolts 2 ~.aere pulled out from the column. The proof stresses upon break were remarkably increased compared with a cornventiorial joint method which caused large deformation <iue to sticking.
_ 2~3~10"~
From the results as described above, it was proved that the column-beam stru~:aure having high strength and toughness calaable of being easily e;ecuted in a construction field and of reducr_ng a initial deformation could be constituted.
The feature of the i~resent= invention offers the following adv~.mta<~e:~
The joint structure causing no sticking of the beam into the side= fac~~~> of t.hfe column antis less deformation, and having excellent strength can be proviesed;
The col-nmr~ a:~<~ the heam each Yuaving a 1 urge structure can be joined rigidly in <~ very simp7.e method, both ridge and span d.irec:t.ions can be joiners rigidly at the same time, and a two-d.ime~nsional r:i.gid frame si: ruct lire which is quite same as a steel fr~~mc: corustructicn nc~ ~ reinforced concrete construction c:an he ieali<,ec~ by a timber structure;
A cost fc>r finishing the insiesF-' of the building constructed Faith tree joint. method of the present. invention can be reducee; and wide ~>l:>ace>s having a l arge degree of freedom can be secured becau:>e the ~_:onstitution material of the laminated matemia7s having larga sectional areas perform the role of final Ii~:ti~rc~ mat=erials; anc As compared with a joint. :>truci'ure ~n wh_i.c:h deformed bars are inser-:.e<~ into a ccclumn and beams, and then bided with adhe:,i.vr s, ire s s not necces~>ary to secure a period of time of curing for ~~c:~n<sincs upon Ee xecut ion and to control the temperatlare anc hum.ic=city, tlmrel>y remarkably reducing a period of time for constructing a b~lilding.
Claims (4)
1. A joint structure for use in construction, comprising:
a first wooden member;
a second wooden member provided at one end with a slit and further provided with at least five first small holes equispaced along a first circumference;
a plurality of bolts;
at least one steel gusset plate having a T-shape with a head portion and a leg portion connected thereto, a plurality of through holes being formed in said head portion, at least five second small holes being provided in said leg portion, said leg portion being inserted into said slit and said second small holes being equispaced along a second circumference so that said second small holes are aligned with respective ones of said first small holes; and at least five shear-force-transmitting drift pins inserted through respective ones of said first small holes and through aligned ones of said second small holes, said bolts being disposed side by side and screwed into said first wooden member so that end portions of said bolts protrude outside said first wooden member and extend through the through holes of said head portion, said bolts being secured to said first wooden member by means of nuts.
a first wooden member;
a second wooden member provided at one end with a slit and further provided with at least five first small holes equispaced along a first circumference;
a plurality of bolts;
at least one steel gusset plate having a T-shape with a head portion and a leg portion connected thereto, a plurality of through holes being formed in said head portion, at least five second small holes being provided in said leg portion, said leg portion being inserted into said slit and said second small holes being equispaced along a second circumference so that said second small holes are aligned with respective ones of said first small holes; and at least five shear-force-transmitting drift pins inserted through respective ones of said first small holes and through aligned ones of said second small holes, said bolts being disposed side by side and screwed into said first wooden member so that end portions of said bolts protrude outside said first wooden member and extend through the through holes of said head portion, said bolts being secured to said first wooden member by means of nuts.
2. A joint structure according to claim 1 wherein said second wooden member is further provided with a plurality of third small holes equispaced along a third circumference and said leg portion is further provided with a plurality of fourth small holes equispaced along a fourth circumference, said first circumference and said second circumference being concentric and said second circumference and said fourth circumference being concentric, further comprising a plurality of shear-force-transmitting additional drift pins inserted through respective ones of said third small holes and through aligned ones of said fourth small holes.
3. A joint structure according to claim 1, wherein said leg portion is in a plumb position and said head portion is rectangular with four corners and is secured in position at least near the four corners by said bolts and the nuts.
4. A joint structure according to claim 1, wherein each of said bolts is a lag screw bolt provided with a threaded screw portion and, at an end section, with a bolt portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6-39662 | 1994-03-10 | ||
| JP3966294A JP2653414B2 (en) | 1994-03-10 | 1994-03-10 | Timber column-beam joint structure using lag screw bolts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2131107A1 CA2131107A1 (en) | 1995-09-11 |
| CA2131107C true CA2131107C (en) | 2003-11-18 |
Family
ID=12559304
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2131107 Expired - Fee Related CA2131107C (en) | 1994-03-10 | 1994-08-30 | Wood column-beam joint structure using lag screw bolts |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2653414B2 (en) |
| AU (1) | AU678839B2 (en) |
| CA (1) | CA2131107C (en) |
| NZ (1) | NZ264341A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11525255B2 (en) | 2020-05-04 | 2022-12-13 | Columbia Insurance Company | Concealed structural connector |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI98280C (en) * | 1994-08-02 | 1997-05-26 | Finnforest Oy | Pre-fabricated connection structure |
| JP2010106599A (en) * | 2008-10-31 | 2010-05-13 | Ncn:Kk | Structure for attaching joint metal |
| JP5925426B2 (en) * | 2011-04-12 | 2016-05-25 | 株式会社竹中工務店 | Column beam connection structure and column beam connection method |
| JP2015010389A (en) * | 2013-06-28 | 2015-01-19 | 学校法人 名古屋電気学園 | Frame joining structure and frame joining method |
| JP6248361B2 (en) * | 2014-05-13 | 2017-12-20 | 富山県 | Friction damper and wall body |
| CN107536545A (en) * | 2017-09-30 | 2018-01-05 | 罗洪坚 | A kind of square tube towel rack |
| JP7063111B2 (en) * | 2018-05-24 | 2022-05-09 | 株式会社大林組 | Column-beam joining structure and column-beam joining method |
| CN112627330A (en) * | 2020-12-03 | 2021-04-09 | 天津大学 | Assembly type steel-engineering bamboo-wood composite beam-column end plate connecting joint and construction method |
| CN112627331A (en) * | 2020-12-03 | 2021-04-09 | 天津大学 | Beam placing type node of assembled steel-engineering bamboo-wood composite beam column sleeve and construction method |
| CN112482565A (en) * | 2020-12-03 | 2021-03-12 | 天津大学 | Assembled steel-engineering bamboo-wood composite beam column rigid node and construction method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2404570A (en) * | 1970-01-07 | 1972-07-13 |
-
1994
- 1994-03-10 JP JP3966294A patent/JP2653414B2/en not_active Expired - Lifetime
- 1994-08-30 NZ NZ26434194A patent/NZ264341A/en unknown
- 1994-08-30 CA CA 2131107 patent/CA2131107C/en not_active Expired - Fee Related
- 1994-08-30 AU AU71550/94A patent/AU678839B2/en not_active Ceased
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11525255B2 (en) | 2020-05-04 | 2022-12-13 | Columbia Insurance Company | Concealed structural connector |
Also Published As
| Publication number | Publication date |
|---|---|
| AU7155094A (en) | 1995-09-21 |
| AU678839B2 (en) | 1997-06-12 |
| NZ264341A (en) | 1996-07-26 |
| JP2653414B2 (en) | 1997-09-17 |
| CA2131107A1 (en) | 1995-09-11 |
| JPH07252888A (en) | 1995-10-03 |
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