CN101506446A - Tool for joining reinforcing bars - Google Patents
Tool for joining reinforcing bars Download PDFInfo
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- CN101506446A CN101506446A CNA2007800315508A CN200780031550A CN101506446A CN 101506446 A CN101506446 A CN 101506446A CN A2007800315508 A CNA2007800315508 A CN A2007800315508A CN 200780031550 A CN200780031550 A CN 200780031550A CN 101506446 A CN101506446 A CN 101506446A
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- reinforcing bar
- sleeve
- wedging
- spare
- wedge
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
- E04C5/162—Connectors or means for connecting parts for reinforcements
- E04C5/163—Connectors or means for connecting parts for reinforcements the reinforcements running in one single direction
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
- E04C5/162—Connectors or means for connecting parts for reinforcements
- E04C5/163—Connectors or means for connecting parts for reinforcements the reinforcements running in one single direction
- E04C5/165—Coaxial connection by means of sleeves
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- Structural Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
A reinforcing bar joint 1 includes a sleeve 2 having an elliptic section, and a wedging means 4. The wedging means 4 is composed of wedge members 4a, 4b which are pressed into between reinforcing bars 5a, 5b. The press-in positions of these wedge members 4a, 4b are spaced away from each other so that the reinforcing bars 5a, 5b, the sleeve 2, and the wedge members 4a, 4b are integrated in the area lying between the press-in positions. This can also move the points of action of tensile forces acting on the reinforcing bars outward, thereby increasing the distance between the points of action and reducing the amount of rotation of the sleeve 2.
Description
Technical field
The present invention relates to a kind of applied tool for joining reinforcing bars when reinforcing bar is bonded together.
Background technology
Reinforcing bar is the primary structure key element of reinforced concrete structure (reinforced concrete structure) and steelframe reinforced concrete structure (SRC structure), and is processed to predetermined length easy arrangement when making up at the scene.Thereby the operation that engages reinforcing bar at the scene is absolutely necessary.
The method of joint reinforcing bar has multiple, comprises lap joint, mechanical splice and pressure-gas weld joint etc.Wait according to the required quality of structure, condition of work, employed bar diameter and suitably to select and to use these joints.
In this case, above-mentioned joint method has separately shortcoming and advantage.For example, lap joint is by utilizing reinforcing bar that concrete adhesive power is engaged reinforcing bar simply, in addition, because must two reinforcing bars are overlapping, so big more being difficult to more of the diameter of reinforcing bar makes up, also being difficult to guarantee overlap length more.In addition, for mechanical splice, must manage many details, for example reinforcing bar inserts the insertion length of coupling and the tightening torque that applies, and the pressure-gas weld joint then needs the welder to hold the specific qualification of carrying out pressure-gas weld.
For this reason, researched and developed and multiplely can easily engage reinforcing bar and do not need to guarantee the reinforcing bar joint method of lap length, yet in these methods, the reinforcing bar that a kind of method that is used to engage two reinforcing bars parallel to each other is only applicable to have fixed intervals lacks versatility (with reference to patent documentation 5) aspect rebar spacing.
In this case, developed a kind of fastener that steel bushing constituted by wedging spare and section ovalize.According to this fastener, insert in the sleeve the other way around the end of two reinforcing bars respectively, then wedging spare is squeezed into between two reinforcing bars, thereby reinforcing bar can be bonded with each other together (with reference to patent documentation 1,2 and non-patent literature 1) from the wedge through hole that is provided with at sleeve.
The real public clear 58-32498 communique of [patent documentation 1] Japan
The real public clear 58-53880 communique of [patent documentation 2] Japan
[patent documentation 3] Japan opens flat 04-122111 communique in fact
The real public clear 60-3858 communique of [patent documentation 4] Japan
No. 3197079 communique of [patent documentation 5] Japan Patent
[non-patent literature 1] ERICO international corporation, [in search on August 2nd, 2006], (internet＜URL:
Http:// www.erico.com/products/QuickWedge.asp).
Yet in this structure, the axis of two reinforcing bars is offset.Therefore, when acting on the tension force that has on the rightabout on each reinforcing bar, moment of flexure can act on the sleeve, and sleeve rotates along the position that makes each tension force overlapping direction on same straight line.
Therefore, be created in the moment of flexure that does not produce when independent effect has tension force on the reinforcing bar, the rotation of sleeve makes a part that acts on the tension force on the reinforcing bar act on the edge of opening portion of sleeve, thereby causes sleeve to split.
In addition, can cause following unfavorable condition to take place: the reaction force of the power that the edge of opening portion of sleeve broadens is acted on the reinforcing bar by sleeve, cause the reinforcing bar fracture, perhaps, cause reinforcing bar from sleeve, to be deviate from because the rotation of sleeve makes reinforcing bar fluff with engaging of wedging spare.
Thereby produced following problem: although can be with above-mentioned fastener structure applications in the less reinforced concrete structure of tensioning load or the shear reinforcement of steelframe reinforced concrete structure, it be not suitable for the bigger main muscle of tension loading.
In addition, following scheme has been proposed: edge of opening portion is cut obliquely to prevent that producing stress on the reinforcing bar concentrates (patent documentation 3), perhaps make wedging spare form the cross section to prevent wedging spare rotation (patent document 4).
Yet, even as patent documentation 3, the edge of opening portion of sleeve cut obliquely the sleeve rotation that produces in the time of also can't preventing that tension force from acting on the reinforcing bar, even as patent documentation 4, wedging spare is formed the cross section, also can't prevent above-mentioned sleeve rotation.
Like this, though motion has several fasteners that is made of the steel bushing of wedging spare and section ovalize, however the decline of the still unresolved in the prior art tensile strength of reinforcement that when tension force acts on two reinforcing bars, is caused by the sleeve rotation.
Summary of the invention
The present invention In view of the foregoing finishes, its purpose is to provide a kind of tool for joining reinforcing bars, this tool for joining reinforcing bars can be applied to the main muscle of reinforced concrete structure and SRC structure, and can prevent to be descended by the tensile strength of reinforcement that the sleeve rotation is caused when tension force acts on two reinforcing bars.
The applicant researches and develops from following aspect, promptly, even when the tool for joining reinforcing bars that adopts sleeve engages reinforcing bar, can not eliminate the sleeve rotation fully, whether can be by reducing the rotation amount of sleeve, produce and be not only applicable to the tool for joining reinforcing bars that shear reinforcement also is applicable to main muscle, consequently, by using a plurality of wedging spares to constitute and with the novel structure that the position separates that is pressed into of these wedging spares, the applicant has successfully reduced the rotation amount of sleeve, and can also suppress the flexural deformation of reinforcing bar thereupon, and can prevent that reinforcing bar from deviating from from sleeve.
That is according to the present invention, when the first wedging spare and the second wedging spare were pressed between first reinforcing bar and second reinforcing bar, the first wedging spare and the second wedging spare were subjected to respectively from the reaction force of sleeve inner peripheral surface and in nip first reinforcing bar and second reinforcing bar.And then, by nipping and the restriction of sleeve of these two wedging spares, make sleeve and first, second reinforcing bar and first, second wedging spare roughly become one near being pressed into the position of the first wedging spare near the zone that is pressed into the position of the second wedging spare, so when the tension force on acting on reinforcing bar made the sleeve rotation, sleeve and first, second reinforcing bar and first, second wedging spare rotated integratedly.
In other words, when sleeve owing to acting on tension force on first, second reinforcing bar and rotate, first, second reinforcing bar and first, second wedging spare and sleeve just rotate integratedly in the zone that is pressed between the position that is pressed into the position and the second wedging spare of the first wedging spare, and the application point that acts on the tension force on the reinforcing bar is transferred to the outside of this overall region.
Therefore, compare with the existing structure with a wedging spare, the distance that acts between the application point of the tension force on the reinforcing bar increases significantly, therewith correspondingly, does the time spent at the tension force that sleeve is subjected on the reinforcing bar, and its rotation amount also reduces significantly.
Therefore, reduced the flexural deformation that produces on the reinforcing bar, and also reduced the active force that reinforcing bar broadens sleeve openings, can prevent under the tensioning load effect the breakdown of sleeve cracking, reinforcing bar is deviate from from sleeve and the wedging of reinforcing bar is broken, and may make the fracture of reinforcing bar generation base material.
At this, reinforcing bar is deviate to refer to reinforcing bar and is located shear failure in the position of nipping of wedging spare (hatch region jaggy), sleeve cracking refers to the cracking breakdown of the sleeve edges portion of reinforcing bar institute butt, and wedging breaks refers to reinforcing bar and locate to break in the position of nipping of wedging spare (hatch region jaggy).In addition, base material fracture (base-material fracture) refers to be pressed into position fracture position beyond of reinforcing bar at wedging spare.
In addition, tool for joining reinforcing bars of the present invention is characterised in that, by being pressed into that the position is provided with two places of wedging spare transferred to the outside with the tension force application point, thereby increases the rotation amount that distance between the application point reduces sleeve, wherein, the number of wedging spare is not limited to two.That is under the situation of three above wedging spares, the distance between the application point becomes the distance between outermost two wedge through holes in three wedge through holes.In addition, in this case, being positioned at outermost two wedge through holes in three wedging spares becomes the first and second wedging spares of the present invention.
As long as sleeve constitute following structure then the concrete structure of sleeve can be arbitrarily: first reinforcing bar and second reinforcing bar can be inserted in the both ends open of sleeve with predetermined overlap length, and the first wedging spare and the second wedging spare can be pressed into respectively in two wedge through holes of sleeve.
For example, can set compliant sleeve arbitrarily, the for example section shape of sleeve, length and hardness, but when the hardness of sleeve is lower than the hardness of first and second reinforcing bars relatively, can prevent the breakdown of sleeve cracking, prevent that reinforcing bar from deviating from and prevent that the reinforcing bar wedging from breaking from sleeve, thereby can make the fracture of reinforcing bar generation base material reliably.
For the hardness that makes sleeve is lower than the hardness of first and second reinforcing bars relatively, for example in the manufacture process of sleeve, implements annealing in process and get final product.
Description of drawings
Fig. 1 is the figure of the described tool for joining reinforcing bars of present embodiment, and Figure 1A is a front view, and Figure 1B is the sectional view along the A-A line.
Fig. 2 illustrates the figure of the fastener of the described reinforcing bar of employing present embodiment with two articulate states of reinforcing bar, and Fig. 2 A is a front view, and Fig. 2 B is the sectional view along the B-B line.
Fig. 3 is the figure of the effect of the described tool for joining reinforcing bars of explanation present embodiment.
Fig. 4 is the figure of the effect of the described tool for joining reinforcing bars of explanation present embodiment.
Fig. 5 illustrates the photo that the test body with two wedging spares is carried out the result of tension test.
Fig. 6 illustrates the photo that the test body with a wedging spare is carried out the result of tension test.
Fig. 7 is the front view of the fastener of the described reinforcing bar of variation.
Label declaration:
1: tool for joining reinforcing bars;
2: sleeve;
4: wedging spare;
4a: wedging spare (the first wedging spare);
4b: wedging spare (the second wedging spare);
5a: reinforcing bar (first reinforcing bar);
5b: reinforcing bar (second reinforcing bar);
6a, 6b: opening;
9a, 9b: wedge through hole.
The specific embodiment
Below, describe with reference to the embodiment of accompanying drawing tool for joining reinforcing bars of the present invention.In addition, to substantially being that identical parts etc. are marked with same numeral and omit its explanation with prior art.
Fig. 1 is the front view of the described tool for joining reinforcing bars of present embodiment.As shown in the drawing, the described tool for joining reinforcing bars 1 of present embodiment is that oval-shaped sleeve 2 constitutes by wedging spare 4 and section shape, can be with as the end of the reinforcing bar 5a of first reinforcing bar with insert among both ends open 6a, the 6b of sleeve 2 respectively in the mode of overlapped predetermined length as the end of the reinforcing bar 6b of second reinforcing bar, wedging spare 4 is by constituting as the wedging spare 4a of the first wedging spare with as the wedging spare 4b of the second wedging spare, and this wedging spare 4a, 4b are pressed between reinforcing bar 5a, the 5b.
Wedge through hole 9a, 9a are positioned on the relative position of pair of plates shape wall portion 8,8, and are formed at the end side of reinforcing bar 5b, and wedge through hole 9b, 9b be positioned on the relative position of pair of plates shape wall portion 8,8, and are formed at the end side of reinforcing bar 5a respectively.
Near the edge of opening portion of the most significant sleeve 2 of the flexural deformation that reinforcing bar 5a, 5b are preferably avoided in the position of wedge through hole 9a, 9a.That is, the position of wedge through hole 9a, 9a preferably sets in the position of the edge part certain distance that leaves sleeve 2, for example be set in the edge part that leaves sleeve 2 for bar diameter about equally or than on its also big position.
In addition, the described tool for joining reinforcing bars 1 of present embodiment is applied to being bonded with each other of main muscle of reinforced concrete structure or SRC structure, for the steel type of sleeve 2 and wedging spare 4a, 4b, suitably determine according to hardness and tensile strength as the reinforcing bar 5a, the 5b that engage object.
In order to adopt the described tool for joining reinforcing bars 1 of present embodiment that reinforcing bar 5a, 5b are joined together, at first, the end of reinforcing bar 5a is inserted, and the end of reinforcing bar 5b is inserted from another opening 6b of sleeve 2 from an opening 6a of sleeve 2.At this moment, this reinforcing bar is inserted in the sleeve 2, and is configured to reinforcing bar 5a, 5b at the overlapped predetermined length in their end.
Next, wedging spare 4a is run through and be pressed in wedge through hole 9a, 9a, and wedging spare 4b run through and be pressed in wedge through hole 9b, 9b.Suitably selected the known in the past wedge machine of beating to use and get final product when being pressed into.
Fig. 2 is the figure that the state of making the joint of finishing reinforcing bar 5a, 5b after the wedge end of job is shown.
In the described tool for joining reinforcing bars 1 of present embodiment, when wedging spare 4a, 4b were pressed between reinforcing bar 5a and 5b, wedging spare 4a, 4b nipped respectively under the state that is subjected to from the reaction force of sleeve 2 inner peripheral surfaces among reinforcing bar 5a, the 5b.And then, because these two wedging spare 4a, 4b nip and the restriction of sleeve 2 couples of reinforcing bar 5a, 5b, the tension force that acts on reinforcing bar 5a, the 5b makes sleeve 2 rotations, shown in Fig. 3 (a), only when this is discussed, reinforcing bar 5a, 5b, wedging spare 4a, 4b and sleeve 2 are roughly becoming one near being pressed into the position near the regional P scope position of being pressed into of wedging spare 4b of wedging spare 4a.
On the other hand, in the prior art of having only a wedging spare, shown in Fig. 3 (b), the regional P ' scope that is pressed into the position that only will stride wedging spare 31 is interior as one.
That is, in the prior art, a body region is regional P ' only, and in the present embodiment, a body region is P, and the application point that acts on the tension force on the reinforcing bar is transferred to some P1 on the boundary line that is positioned at regional P from the some P ' 1 on the boundary line that is positioned at regional P '.
Therefore, the spacing N between the reinforcing bar is constant, but the distance between the application point increases considerably to M from M '.In addition, where arrive as the border of the regional P of one be the effect length that is subjected to sleeve 2 for reinforcing bar 5a, 5b, sleeve 2 and wedging spare 4a, 4b.That is, if sleeve 2 is long, then its restriction can make the border of regional P move to the edge part direction of sleeve 2, if sleeve 2 is short, then can not get this restriction substantially, and therefore move to the center position of sleeve on the border of regional P.In addition, the yield strength of sleeve 2 is depended on the border of zone P, if the yield strength of sleeve 2 is big, then its restriction makes the border of regional P move to the edge part direction of sleeve 2, if the yield strength of sleeve 2 is little, then almost can not get this restriction, therefore the border of regional P can be moved to the center position of sleeve.
Fig. 4 is the figure that is illustrated in the state of sleeve rotation when effect has tension force on the reinforcing bar, and the distance that Fig. 4 (a) illustrates between the application point is the example of the present embodiment of M, and Fig. 4 (b) illustrates the example that application point is the prior art of M '.
As shown in these figures, the rotation amount of sleeve is that θ ' (Fig. 4 (b)) compares when reinforcing bar is subjected to tension force in the prior art, and the rotation amount in the present embodiment is reduced to θ (Fig. 4 (a)) significantly.
Such as described above, according to the described tool for joining reinforcing bars 1 of present embodiment, form wedge through hole 9a, 9a that runs through for wedging spare 4a and wedge through hole 9b, the 9b that runs through for wedging spare 4b respectively in mode along the axis partition distance L of reinforcing bar 5a, 5b, and wedging spare 4a, 4b be pressed into respectively in the described wedge through hole, so can reduce the rotation amount of sleeve 2 when effect has tension force on reinforcing bar 5a, 5b significantly.
Therefore, the flexural deformation that produces on reinforcing bar 5a, 5b diminishes, and also diminish from the power that the opening that makes sleeve 2 of reinforcing bar 5a, 5b broadens, can prevent under tensioning load, to make split fracture, reinforcing bar 5a, 5b of sleeve 2 to deviate from, and prevent that reinforcing bar 5a, 5b from wedging fracture, so may make reinforcing bar 5a, 5b that the base material fracture takes place.
And,, be that two wedging spare 4a, 4b leave and are pressed into respectively between reinforcing bar 5a, the 5b, so sleeve 2 is elongated naturally according to the tool for joining reinforcing bars 1 of present embodiment.
Therefore, the component that reinforcing bar 5a, 5b act on the opening of sleeve 2 significantly diminishes, and also can suppress the rotation of sleeve 2 from this aspect.
Fig. 5 and Fig. 6 are the photos that the result of tension test is shown.Fig. 5 is the test body corresponding with the present embodiment with two wedging spares, and reinforcing bar adopts U.S. # 8 reinforcing bar (class 60, #8 are equivalent to the D25 of Japanese Industrial Standards (JIS)).On the other hand, Fig. 6 is the test body corresponding with the prior art with a wedging spare, and reinforcing bar adopts U.S. #6 reinforcing bar (class 60, #6 is equivalent to JISD19).
At first, as shown in Figure 6, in the test body of prior art, the tension force that acts on the reinforcing bar makes sleeve rotate greatlyyer, and also produces bigger flexural deformation along with this rotation on reinforcing bar.And because reinforcing bar has produced bending, the component of the direction that the opening that makes sleeve of reinforcing bar broadens acts on the sleeve, and this becomes the reason that sleeve splits and ruptures.
By above test result as can be known, in the test body of prior art, the sleeve fracture of splitting before reinforcing bar generation base material fracture.
On the other hand, in the test body corresponding, act on tension force on the reinforcing bar and make the sleeve rotation with present embodiment shown in Figure 5, but its rotation amount compare significantly with Fig. 6 and reduce, follow the flexural deformation of reinforcing bar of this rotation also less.Therefore, sleeve not split fracture.
By above test result as can be known, in the test body corresponding with present embodiment, near the reinforcing bar bend tension junction ruptures, but breaking load surpasses tensile strength of reinforcement (rated value), reached the load that equates with the tensile strength that had originally as blank, thereby fully satisfied performance with the bar splice of the muscle of deciding.
In the present embodiment, tool for joining reinforcing bars 1 has been applied in being bonded with each other of main muscle of reinforced concrete structure or SRC structure, yet in addition, also can be applied to being bonded with each other of shear reinforcement.
In addition, can form concrete filler opening 51 as shown in Figure 7 on sleeve 2, this does not have special mentioning in the above-described embodiment yet.
According to this structure, during the piling concrete, concrete flow in the sleeve 2 via concrete filler opening 51, therefore, can increase the bond strength of reinforcing bar 5a, 5b.In addition, the axis along sleeve 2 forms a plurality of holes in advance, can be with wherein several holes as the wedge through hole, with other hole as the concrete filler opening.
The result of tension test is shown in the table 1.In addition, adopting diameter in the tension test is that (the nominal area of section is 387.1mm to D22
2), the steel type is steel (steel concrete bar steel, Japanese Industrial Standards, the standard value: yield point 345N/mm of SD345
2, tensile strength 490N/mm
2) reinforcing bar.In addition, under the situation that is provided with two holes, pitch of holes is 50mm.Also has identical hole in the test that will describe hereinafter.
[table 1]
At first, all identical sleeve (cylindrical shell) of type of test block 2 and test block 3 use shapes and steel.Difference between the test block is: test block 2 has a wedging spare (a pair of wedge through hole) and test block 3 has two wedging spares.These test blocks are compared, and under wedging spare was one situation, reinforcing bar was deviate from as can be seen, can make the fracture of reinforcing bar generation base material and be that two situation is next at wedging spare.
This expression: even the shape of sleeve is identical and have the steel of same type, when being provided with two wedging spares, the tensile strength of tool for joining reinforcing bars is higher than the rated value of reinforcing bar tensile strength.This actual verification action effect of the present invention.
Next, test block 5 and test block 6 use the kind of shapes and steel mutually the same but with the shape of test block 2 and test block 3 and the different sleeve of type of steel, and same with test block 2 and test block 3, the sleeve with a wedging spare and two wedging spares is compared.
These test blocks are compared, and under wedging spare was one situation, reinforcing bar was deviate from as can be seen, and was under two the situation at wedging spare, the fracture of reinforcing bar generation base material.This expression: and test block 2 and test block 3 between more similarly, though the type of the shape of sleeve and steel is identical, be that the tensile strength of tool for joining reinforcing bars also is higher than the rated value of tensile strength of reinforcement under two the situation at the number of wedging spare.This is actual to have proved action effect of the present invention.
Next, test block 1 and 4 all has two wedging spares, and its sleeve other conditions except thickness all identical (length sleeve is short, is 100mm).The wall thickness of test block 1 is 4mm, and the wall thickness of test block 4 is 10mm.
These test blocks are compared, as can be seen, when wall thickness is 4mm, sleeve cracking, and reinforcing bar generation base material fracture when wall thickness is 10mm.Only from this test result, though have two wedging spares, wall thickness hour also can't make the fracture of reinforcing bar generation base material, yet it is thickness is identical and the test block 3 of reinforcing bar generation base material fracture is taken into account in the lump, can infer: at sleeve more in short-term, therefore the spacing distance of two wedging spares also shortens naturally, and the position that is pressed into two wedging spares separates the action effect of the present invention that is produced and do not give full play of.
Next, the wall thickness of test block 7 and sleeve identical with 8 wedging number of packages amount is all identical with the kind of steel, and difference is: the length sleeve of test block 7 is 100mm, and the length sleeve of test block 8 is 120mm.
These test blocks are compared as can be seen, can suppress the sleeve rotation, consequently, can prevent that sleeve edges from ftractureing, reinforcing bar is deviate from and wedging is broken by increasing length sleeve.
[embodiment 2]
Table 2 shows the result of another tension test.In this table, deviate to refer to reinforcing bar in position (the hatch region) shear failure that wedging spare is nipped with breach, cracking refers to the sleeve edges portion cracking breakdown of reinforcing bar institute butt.Wedging is broken and is referred to reinforcing bar and break in the position (hatch region with breach) that wedging spare is nipped.
In addition, use diameter to be D22, type steel (steel concrete bar steel, Japanese Industrial Standards, standard value: yield point 390N/mm in the tension test as SD390
2, tensile strength 560N/mm
2) reinforcing bar.In addition, because there is error in test result, so in a plurality of results shown in " test result " hurdle.
[table 2]
At first, because there is error in the result of test block 9, Given this, the total length of sleeve is extended to 110mm from 100mm, to form test block 10～12, the base material fracture can both take place in these test blocks substantially.This reason is as follows: when sleeve more in short-term, its rotation amount can increase, make the bigger moment of flexure of generation on reinforcing bar, the influence of the part (hatch region with breach) that wedging spare is nipped increases, thereby causes the reinforcing bar wedging to be broken, on the contrary, if sleeve is longer, then its rotation amount can reduce, thereby the moment of flexure that produces on the reinforcing bar also diminishes, so reduced influence, the base material fracture only taken place to the portion of nipping.
Yet test block 10～12 has 0.93～0.99 tensile strength ratio, and this also demonstrates and still has the leeway of improving performance.
Herein, so-called tensile strength ratio is meant the ratio of the tensile strength of the tensile strength that obtains by test and reinforcing bar (blank).If this numerical value is lower than 1, represent that then two reinforcing bars engage back tensile strength and descend.
Next, in view of test block 10～12 fails to obtain sufficient tensile strength ratio, the wall thickness of sleeve is increased to 5mm forming test block 13 and 14, yet the result does not see to have greatly improved.
From the result of test block 10～14 as can be seen, can access certain tensile strength, yet also can't be further improved even increase wall thickness by the length of guaranteeing sleeve.It is too high that the inventor thinks that this reason is attributable to the sleeve rigidity, thereby employed sleeve in the test block 9～14 is carried out annealing in process, to form test block 15～20.
Promptly, though the sleeve of test block 9～14 is by raw material S45C (the machine construction carbon steel material that does not pass through annealing in process, Japanese Industrial Standards) produced, have enough hardness when but raw material S45C is not through annealing in process, so test block 15～20 becomes less than the hardness of reinforcing bar its hardness owing to raw material S45C having been carried out annealing in process.
Its result, the tensile strength ratio that thickness is about the test block 18～20 of 4.8mm is 1 substantially, and all test blocks all can make the fracture of reinforcing bar generation base material.This can think because: annealing in process becomes sleeve to be imbued with the parts of ductility, consequently, can reduce near the stress that acts on the reaction force on the reinforcing bar and on reinforcing bar, produce the edge part by sleeve by this reaction force, thereby and the sleeve interior surface of also can nipping of the convex-concave on the reinforcing bar side face can sponge the variation of the convex-concave state on the reinforcing bar side face.
Table 3 expression bar diameter carries out the result of identical tension test when D22 changes to D25.Though length sleeve changes to 110mm～130mm according to the increase of shank diameter, test result is identical with test block 9～20 substantially.The tensile strength ratio of raw material S45C being carried out the resulting test block 28～35 of annealing in process is roughly 1.All the other all test blocks all can make the fracture of reinforcing bar generation base material except test block 33.
This is that the situation of D22 is identical with diameter, can think that this reason is: annealing in process becomes sleeve to be imbued with the parts of ductility, consequently, reduced near the stress that acts on the reaction force on the reinforcing bar and on reinforcing bar, produce the edge part by sleeve by this reaction force, thereby and the concavo-convex inner surface that also bites into sleeve on the reinforcing bar side face can sponge the variation of the concavo-convex state on the reinforcing bar side face.
In addition, length sleeve makes the fracture of reinforcing bar generation base material reliably from the test block 35 that 120mm changes to 130mm, and the tensile strength ratio can be improved to 1.00～1.01, yet this can think to make what the rotation amount of sleeve reduced to obtain owing to having increased sleeve.
In addition, regard the above-mentioned cracking breakdown of sleeve as reason that annealing in process reduces sleeve intensity, thereby also can improve sectional by increasing the sleeve wall thickness.Also can prevent the breakdown of sleeve cracking by the method, and can make the fracture of reinforcing bar generation base material reliably.
[table 3]
Like this, be annealed the sleeve of handling by use, can increase substantially the joint performance of fastener of the present invention, on the other hand, must compensate the intensity that is caused by annealing in process with the form that for example increases wall thickness and reduce, otherwise sleeve will ftracture at edge part (test block 15,16 and 33).
That is, when use is annealed the sleeve of handling, must take into full account the sectional and the annealing back intensity of sleeve.
On the other hand, also can increase length sleeve and replace compensating the intensity reduction that is caused by annealing, increase length sleeve, can suppress the sleeve rotation, make the load that acts on the sleeve reduce.By this method, can prevent sleeve edges portion cracking, thereby can make reinforcing bar generation base material fracture (with reference to test block 1,3,7 and 8) reliably.
Claims (4)
1. a tool for joining reinforcing bars is characterized in that,
This tool for joining reinforcing bars comprises:
Sleeve with oval-shaped profile can insert first reinforcing bar and second reinforcing bar respectively from this sleeve openings at two ends, and the end that makes first reinforcing bar and second reinforcing bar disposes in the mode of overlapping predetermined length; And
Wedging spare, it is in the wedge through hole and be pressed between described first reinforcing bar and described second reinforcing bar, and this wedge through hole is formed at respectively in the pair of plates shape wall portion relative in the wall portion that constitutes this sleeve,
Described wedging spare comprises:
The first wedging spare is in the wedge through hole of its end side that is positioned in described second reinforcing bar in the described wedge through hole; And
The second wedging spare, its in the wedge through hole of the end side that is positioned in described first reinforcing bar,
Described first reinforcing bar and described second reinforcing bar are the main muscle in reinforced concrete structure or the steelframe reinforced concrete structure.
2. a tool for joining reinforcing bars is characterized in that,
This tool for joining reinforcing bars comprises:
Sleeve with oval-shaped profile can insert first reinforcing bar and second reinforcing bar respectively from this sleeve openings at two ends, and the end that makes first reinforcing bar and second reinforcing bar disposes in the mode of overlapping predetermined length; And
Wedging spare, it is in the wedge through hole and be pressed between described first reinforcing bar and described second reinforcing bar, and this wedge through hole is formed at respectively in the pair of plates shape wall portion relative in the wall portion that constitutes this sleeve,
Described wedging spare comprises:
The first wedging spare is in the wedge through hole of its end side that is positioned in described second reinforcing bar in the described wedge through hole; And
The second wedging spare, its in the wedge through hole of the end side that is positioned in described first reinforcing bar,
Described first reinforcing bar and described second reinforcing bar are the shear reinforcements in reinforced concrete structure or the steelframe reinforced concrete structure.
3. tool for joining reinforcing bars as claimed in claim 1 or 2 is characterized in that,
The hardness of described sleeve is lower than the hardness of described first reinforcing bar and second reinforcing bar relatively.
4. tool for joining reinforcing bars as claimed in claim 3 is characterized in that,
In the manufacture process of described sleeve, sleeve is implemented annealing in process.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP227514/2006 | 2006-08-24 | ||
| JP2006227514 | 2006-08-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101506446A true CN101506446A (en) | 2009-08-12 |
Family
ID=39106550
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007800315508A Pending CN101506446A (en) | 2006-08-24 | 2007-07-23 | Tool for joining reinforcing bars |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20100024344A1 (en) |
| EP (1) | EP2055853B1 (en) |
| JP (1) | JP5080475B2 (en) |
| CN (1) | CN101506446A (en) |
| TW (1) | TW200829769A (en) |
| WO (1) | WO2008023456A1 (en) |
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| CN105089206A (en) * | 2015-08-02 | 2015-11-25 | 长安大学 | Steel bar connecting device for precast concrete component and steel bar connecting method for precast concrete component |
| CN106151186A (en) * | 2016-06-24 | 2016-11-23 | 刘祥锦 | A kind of rebar connector, method of attachment, jointing and dedicated extruded mould |
| CN107842146A (en) * | 2017-11-07 | 2018-03-27 | 刘祥锦 | It is a kind of for the connector of bar connecting, jointing and connection construction method |
| CN108412520A (en) * | 2018-05-16 | 2018-08-17 | 中国矿业大学 | A kind of tear-proof easily couples high rigidity bar-mat reinforcement |
| CN108856597A (en) * | 2018-05-31 | 2018-11-23 | 新疆国统管道股份有限公司 | PCCP wire joint and its binding method |
| CN110258953A (en) * | 2019-06-27 | 2019-09-20 | 山东大学 | Telescopic steel concrete supporting device |
| CN114635511A (en) * | 2022-04-18 | 2022-06-17 | 重庆道同建材有限公司 | Prefabricated module connecting process of prefabricated building |
| CN114737715A (en) * | 2022-03-29 | 2022-07-12 | 中国建筑第八工程局有限公司 | Steel bar staggered connection device and connection method thereof |
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| JP5565925B2 (en) * | 2008-10-19 | 2014-08-06 | 岡部株式会社 | Reinforcing bar joint structure |
| US20130028658A1 (en) * | 2011-07-27 | 2013-01-31 | Yee Alfred A | Splice sleeve with elliptical or compound curve cross section |
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| JP7077508B2 (en) | 2016-09-12 | 2022-05-31 | カプラー ソリューションズ リミテッド | Coupler, related parts and how to use them |
| US11189472B2 (en) * | 2017-07-17 | 2021-11-30 | Applied Materials, Inc. | Cathode assembly having a dual position magnetron and centrally fed coolant |
| US20190177977A1 (en) * | 2017-12-12 | 2019-06-13 | Jason M. Miller | Sleeve for coupling reinforcing bar and a method of using the same |
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2007
- 2007-07-23 WO PCT/JP2007/000783 patent/WO2008023456A1/en active Application Filing
- 2007-07-23 JP JP2008530803A patent/JP5080475B2/en active Active
- 2007-07-23 EP EP20070790278 patent/EP2055853B1/en not_active Not-in-force
- 2007-07-23 US US12/310,392 patent/US20100024344A1/en not_active Abandoned
- 2007-07-23 CN CNA2007800315508A patent/CN101506446A/en active Pending
- 2007-08-21 TW TW096130816A patent/TW200829769A/en unknown
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105089206A (en) * | 2015-08-02 | 2015-11-25 | 长安大学 | Steel bar connecting device for precast concrete component and steel bar connecting method for precast concrete component |
| CN106151186A (en) * | 2016-06-24 | 2016-11-23 | 刘祥锦 | A kind of rebar connector, method of attachment, jointing and dedicated extruded mould |
| CN106151186B (en) * | 2016-06-24 | 2018-04-03 | 刘祥锦 | A kind of rebar connector, connection method, jointing and dedicated extruded mould |
| CN107842146A (en) * | 2017-11-07 | 2018-03-27 | 刘祥锦 | It is a kind of for the connector of bar connecting, jointing and connection construction method |
| CN108412520A (en) * | 2018-05-16 | 2018-08-17 | 中国矿业大学 | A kind of tear-proof easily couples high rigidity bar-mat reinforcement |
| CN108412520B (en) * | 2018-05-16 | 2024-03-26 | 中国矿业大学 | Tearing-resistant easy-to-connect high-rigidity reinforcing steel bar mesh |
| CN108856597A (en) * | 2018-05-31 | 2018-11-23 | 新疆国统管道股份有限公司 | PCCP wire joint and its binding method |
| CN108856597B (en) * | 2018-05-31 | 2023-11-03 | 新疆国统管道股份有限公司 | PCCP steel wire joint and binding method thereof |
| CN110258953A (en) * | 2019-06-27 | 2019-09-20 | 山东大学 | Telescopic steel concrete supporting device |
| CN114737715A (en) * | 2022-03-29 | 2022-07-12 | 中国建筑第八工程局有限公司 | Steel bar staggered connection device and connection method thereof |
| CN114635511A (en) * | 2022-04-18 | 2022-06-17 | 重庆道同建材有限公司 | Prefabricated module connecting process of prefabricated building |
| CN114635511B (en) * | 2022-04-18 | 2023-09-22 | 重庆道同建材有限公司 | Prefabricated module connecting process of assembled building |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2055853B1 (en) | 2015-05-20 |
| WO2008023456A1 (en) | 2008-02-28 |
| TW200829769A (en) | 2008-07-16 |
| EP2055853A4 (en) | 2014-03-19 |
| JPWO2008023456A1 (en) | 2010-01-07 |
| EP2055853A1 (en) | 2009-05-06 |
| US20100024344A1 (en) | 2010-02-04 |
| JP5080475B2 (en) | 2012-11-21 |
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Application publication date: 20090812 |