JP2004003231A - Precast concrete member connecting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable rigid connection of PCa members together without welding the same in the field. <P>SOLUTION: The first and second precast concrete members 1, 2 which are arranged in the same direction, each have notches 3, 4 in a connecting surface and a front surface. Then, U-shaped dowel bars 6, 8 are protruded from the respective notches 3, 4 such that front bars 6b, 8b of the respective dowel bars are opposed to each other, and U-shaped joint bars 9 are arranged so as to stride the front bars 6b, 8b of the respective dowel bars 6, 8, followed by arranging an annular arresting bar 10 in a manner enclosing the periphery of the joint bars 9. Thereafter, concrete or mortar is poured in the notches 3, 4 so as to embed the dowel bars 6, 8, the joint bars 9, and the arresting bar 10. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a joint structure for precast concrete members.
[0002]
[Prior art]
Conventionally, as a joining structure of a precast concrete member (hereinafter, also referred to as PCa) as a building member, a notch portion 102 is formed in one joining PCa member 101 as shown in FIGS. A notch 105 is formed on the other PCa member 104 to be joined, and a notch 105 is formed on the other PCa member 104 to be joined. In addition, there is known a method in which a reinforcing bar 106 that is sufficiently fixed is protruded, and these reinforcing bars 103 and 106 are welded and joined together at the site via a reinforcing bar 107, and concrete or mortar is poured into the notch 102. Have been.
[0003]
Further, as shown in FIGS. 22 and 23, the edge of one full PCa floor plate 202 to be joined and the edge of the other full PCa floor plate 203 are placed on the steel beam 201, and the two floor plates 202 and 203 are joined. Notches 204 and 205 forming cotters are formed in the notches, and floor notches 206 and 207 of respective floor plates 202 and 203 are protrudingly provided in the notches 204 and 205, respectively. Is welded at the site via a reinforcement 208, and a stud 209 fixed on the steel beam 201 is arranged in the notches 204, 205, and then concrete or mortar is filled in the notches 204, 205. It is also known to cast and integrate both floor plates 202 and 203 and steel beam 201.
[0004]
[Problems to be solved by the invention]
In any of the conventional techniques, when assembling both PCa members or PCa floorboards on site, since welding work is required on the site, there is a problem that welding skill is required on site and the cost is increased. In addition, there is an artificial variation in reliability in welding technology.
Further, as shown in FIGS. 22 and 23, in the case where the two PCa floor plates 202 and 203 are joined and integrated at a large number of locations, the number of welding locations increases, welding time is required, and the shortening of the construction period is hindered. In addition, there is a problem that the cost is high.
[0005]
Accordingly, an object of the present invention is to provide a joint structure of a PCa member capable of joining with high strength by a wet joint without using welding, and to solve the above-mentioned problem.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, a first invention according to claim 1 relates to a structure in which a first precast concrete member and a second precast concrete member that are joined adjacently project from respective joining side ends. Stopping muscles are provided facing each other, and a locking portion is provided at the tip of both locking muscles, and an annular restraining muscle is arranged so as to surround both locking portions of the opposed locking muscles and joined. Concrete or mortar is cast between the joint-side ends of the two precast concrete members so that the locking and restraining bars are buried.
[0007]
In the present invention, when concrete or mortar is poured between the two precast concrete members at the site, the restraining streaks act like a tag, and the micro-cracks at the initial stage are formed by the confining effect. Entering the center is suppressed, and the breaking line does not pass through the center of the joint. Therefore, it is possible to improve the maximum strength of the joint without using welding.
[0008]
According to a second aspect of the present invention, in the first aspect, a support member comprising a beam or a wall for supporting the two precast concrete members is disposed at a joint between the two precast concrete members, and an upper surface of the support member is provided. A connecting bar protruding in the vicinity of the locking bar is provided, and an annular restraining bar is arranged so as to surround both the locking portions of the opposed locking bar and the upper portion of the connecting bar, and is bonded. Concrete or mortar is cast between the joint-side ends of the two precast concrete members so that the retaining bar, the restraining bar, and the connecting bar are buried.
[0009]
In the present invention, the same action and effect as described above are exerted in joining two precast concretes to a beam or a wall supporting the same.
[0010]
According to a third aspect of the present invention, the first precast concrete member and the second precast concrete member which are arranged and joined in the same direction are formed with cutout portions each having an open side surface and a surface side, The U-shaped cotter streaks are protrudingly provided in the both notches so that the respective front streaks oppose each other, and an annular restraining streak is disposed so as to surround the outer periphery of the front streaks of the cotter streaks, Concrete or mortar is cast into the notch so as to bury the cotter streaks and the restraining streaks.
[0011]
In the present invention, when concrete or mortar is cast in common in both notches at the site, the restraining streaks act like a tag, and the microcracks at the initial stage are formed at the joints by the confining effect. Entering the center is suppressed, and the breaking line does not pass through the center of the joint. Therefore, it is possible to improve the maximum strength of the joint without using welding.
[0012]
According to a fourth aspect of the present invention, the first precast concrete member and the second precast concrete member which are arranged and joined in the same direction are formed with cutout portions each having a joint side surface and a surface side open. The U-shaped cotter streaks protrude from the notches in such a manner that the respective front streaks oppose each other, and the U-shaped joint streaks are arranged so as to straddle the front streaks of the both cotter streaks. An annular restraining bar is arranged so as to surround the outer periphery of the joint bar, and concrete or mortar is cast in the cutout so as to embed the cotter bar, the joint bar and the restraining bar. It is.
[0013]
According to the present invention, in the third aspect of the present invention, by arranging the U-shaped joint streaks, a stronger connection can be achieved.
[0014]
According to a fifth aspect of the present invention, the first precast concrete member and the second precast concrete member which are arranged and joined in the same direction are formed with cutout portions each having an open side surface and a surface side, A U-shaped cotter streak protrudes from both notches so that respective front streaks oppose each other, and a third precast concrete member orthogonal to the first and second precast concrete members is joined. A U-shaped joint bar is projected from the side surface, a front bar of the joint bar is inserted between the joint side surfaces of the first and second precast concrete members, and the U-shaped joint bar is connected to the joint bar of the joint bar. It passes through the front muscle and is arranged so as to straddle the front muscles of the both cotter muscles, and arranges an annular restraining muscle so as to surround the outer circumference of the joint muscle and the joint muscle. It is characterized in that pouring the concrete or mortar so as to fill the joint muscle and joint muscles restraint muscle.
[0015]
In the present invention, the same operation and effect as described above are exhibited in joining three PCa members.
[0016]
According to a sixth aspect of the present invention, in the fifth aspect, the U-shaped joint muscle is formed by two substantially L-shaped joint muscles, and a front muscle of the two joint muscles is provided. Is locked to the front muscle of the joint muscle.
[0017]
In the present invention, not only the functions and effects of the fifth invention are exhibited, but also the relative movement of the joining surfaces of the three PCa members in the longitudinal direction can be prevented.
[0018]
According to a seventh aspect of the present invention, in the first precast concrete member and the second precast concrete member which are arranged and joined in the same direction, a cutout portion in which a joint side surface and a surface side are opened is formed, A U-shaped cotter streak protrudes from both notches so that respective front streaks oppose each other, and a third precast concrete member orthogonal to the first and second precast concrete members is joined. Two substantially L-shaped joint bars protrude from the side surface, the front bar of one of the joint bars is engaged with the front bar of the cotter bar in the first precast concrete member, and the front bar of the other joint bar is connected to the front of the other joint bar. A streak is locked to the front of the cotter streaks in the second precast concrete member, and an annular restraining bar is arranged so as to surround the outer perimeter of the front streaks of the cotter streaks and the joint bar. It is characterized in that pouring the concrete or mortar as jitter muscle and joint muscle burying the constraint muscle.
[0019]
In the present invention, the joint bars also serve the function of the joint bars, and the three PCa members can be joined as described above without using the joint bars.
[0020]
According to an eighth aspect of the present invention, in the first aspect of the invention, the restraining muscle is formed of a spiral muscle.
[0021]
According to a ninth aspect of the present invention, in the ninth aspect of the present invention, the restraining bar is formed by an endless ring.
[0022]
In the eighth and ninth inventions, the spiral muscle and the ring sufficiently function as restraining muscles.
[0023]
According to a tenth aspect of the present invention, a joint end of the first precast concrete slab and the second precast concrete slab is placed on the upper surface of the beam, and both of the precast concrete slabs are connected to the respective joint side ends. A plurality of locking bars protruding opposite to each other are arranged in the longitudinal direction of the joint side end, and a locking portion is provided at the tip of the locking bar, and on the upper surface of the beam, near the locking portion. Positioning the joint bars protruding therefrom, spiral-shaped restraining bars are arranged so as to surround the locking portions of the plurality of locking bars arranged in the longitudinal direction of the joint side end and the upper portion of the connecting bars. Concrete or mortar is cast between the joining sides of the two precast concrete slabs to be joined, so that the retaining bars, the restraining bars, and the connecting bars are buried.
[0024]
In the present invention, a number of locking bars are projected from the bonding end of the PCa floor plate to be bonded, and beam-side bonding bars are arranged near the locking bars, and these locking bars and the connecting bars are connected to the connecting bars. , And these are buried with concrete or mortar, so that both PCa floor plates and beams can be firmly joined and integrated by the above-mentioned confining effect.
[0025]
According to an eleventh aspect of the present invention, in the tenth aspect, a U-shaped reinforcing bar is used as the locking bar.
[0026]
According to a twelfth aspect of the present invention, in the tenth aspect, a reinforcing bar having a large-diameter head at a tip is used as the locking bar.
[0027]
In the eleventh and twelfth inventions, the U-shaped reinforcing bar or the reinforcing bar having the head sufficiently functions as a restraining bar.
[0028]
According to a thirteenth aspect of the present invention, in any one of the first to twelfth aspects, non-shrinkage concrete or fiber reinforced concrete is used as the concrete to be cast between the joints, and the concrete is cast between the joints. Non-shrink mortar or fiber reinforced mortar is used as the mortar to be used.
[0029]
In the present invention, it is possible to improve the proof stress by eliminating the separation between the cast concrete or mortar and the member.
[0030]
BEST MODE FOR CARRYING OUT THE INVENTION
A preferred embodiment of the present invention will be described based on an embodiment shown in FIGS.
[0031]
1 to 4 show a first embodiment in which the present invention is applied to the joining of PCa floor boards arranged in the same direction.
[0032]
1 is a first PCa member to be joined, and 2 is a second PCa member to be joined. In the embodiment, a PCa floor plate is shown.
[0033]
At the joint between the first PCa member 1 and the second PCa member 2, cutouts 3 and 4 are formed in which the joint side surfaces 1 a and 2 a and the surface (upper surface) are open.
[0034]
The first PCa member 1 has a notch 3 formed with a first cotter streak 6 serving as a first locking streak fixed to the first PCa member 1, and a second PCa member 6. A second cotter bar 8 as a second locking bar fixed to the second PCa member 2 protrudes from the notch 4 of the member 2. In the example shown in the figure, both cotter streaks 6 and 8 are formed by bending a reinforcing bar into a U-shape in plan view, and leg legs 6 a and 8 a are sufficiently fixed to the PCa members 1 and 2, and leg legs 6 a , 8a are arranged so as to be substantially perpendicular to the joint side surfaces 1a, 2a of the PCa members 1, 2 and the front muscles 6b, 8b are opposed to each other in parallel with each other. .
[0035]
Reference numeral 9 denotes a joint bar made of a reinforcing bar, which is formed in a U-shape consisting of a front bar 9a and a leg 9b as shown in FIG. 8b. In the illustrated embodiment, two are arranged in parallel.
[0036]
Reference numeral 10 denotes a restraining bar made of a reinforcing bar, which is formed in an annular shape having a diameter surrounding the front bars 6b and 8b of the cotter bars 6 and 8 and the outside of the joint bar 9, and is formed by a spiral bar in the first embodiment. I have.
[0037]
The joining process of the PCa member in the first embodiment will be described.
[0038]
First, at the site, as shown in FIGS. 1 to 3, a first PCa member (PCa floor plate) 1 and a second PCa member (PCa floor plate) 2 face respective notches 3 and 4. Thus, the front muscles 6b and 8b of both cotter muscles 6 and 8 are opposed to each other.
[0039]
Next, the joint muscle 9 is arranged so as to straddle the front muscles 6b, 8b of the both cotter muscles 6, 8.
[0040]
Next, the restraining muscles 10 are arranged so as to surround the front muscles 6b, 8b of the cotter muscles 6, 8 and the outer periphery of the joint muscle 9. In the embodiment shown in the figure, the restraining muscle 10 is formed of a spiral muscle, and this spiral muscle is inserted into the lower part of both cotter muscles 6, 8 while rotating the spiral muscle from above the cotter muscles 6, 8, and the spiral muscle is attached to the cotter muscle. They are arranged on the upper and lower parts of the streaks 6,8.
[0041]
Next, concrete or mortar 11 is cast in the notches 3 and 4 at the site as shown in FIG. 4, and the concrete or mortar 11 is cured and hardened. As the concrete, non-shrinkage concrete or fiber reinforced concrete is used. When the non-shrinkage mortar or fiber reinforced mortar is used as the mortar, the concrete or mortar and the PCa member, cotter bars 6, 8 and restraining bars 10 are used. It is possible to improve the proof stress by eliminating the separation from the skin.
[0042]
As described above, when the concrete or mortar 11 hardens, the micro cracks in the initial stage are suppressed from entering the center of the joint due to the confining effect of restraining the concrete or mortar by the tag-shaped restraining bars 10, and the concrete or mortar is broken. The line will not pass through the center of the joint. Therefore, the maximum strength of the joint can be improved.
[0043]
In addition, since there is no on-site welding for joining the PCa members, work costs can be reduced as compared with the case of welding, furthermore, welding work is not required, the shortage of skilled welding work can be eliminated, and the construction is simplified and the manpower is reduced. There is no fluctuation in reliability.
Note that, in the first embodiment, the joint streaks 9 may be omitted, and in this case, bonding with sufficient strength is possible.
[0044]
5 and 6 show a second embodiment.
[0045]
In the second embodiment, first and second PCa members 1 and 2 as PCa floor plates arranged in the same direction, and a PCa wall plate arranged orthogonally to a joint portion between the two PCa members 1 and 2 In the case where the third PCa member 12 is joined, a joining bar 13 that can also be used as a hanging hook protrudes from the third PCa member 12, and the joining bar 13 is used as the cotter bar of the first embodiment. This is to join together with 6, 8.
[0046]
That is, as shown in FIGS. 5 and 6, notches 3 and 4 and cotter streaks 6 and 8 similar to the above are provided in the first and second PCa members 1 and 2, and the upper end of the third PCa member 12 is provided. Then, a U-shaped joint bar 13 composed of a leg bar 13a and a front bar 13b is protruded. The leg 13 a of the joint bar 13 is sufficiently fixed to the third PCa member 12.
[0047]
First, the first and second PCa members 1 and 2 are arranged on the upper surface of the third PCa member 12 such that the cutouts 3 and 4 and the cotter streaks 6 and 8 are located at the joint streaks 13, Next, the same joint muscle 9 as described above was inserted between the cotter muscles 6 and 8 and the front muscle 13b of the joint muscle 13 with the leg 9b oriented sideways, and then the leg 9b was oriented downward. In the same manner as above.
[0048]
Next, similarly to the first embodiment, the restraining muscle 10 composed of a spiral muscle is arranged.
[0049]
Then, similarly to the first embodiment, concrete or mortar 11 is poured into the cutouts 3 and 4 at the site, cured and hardened.
[0050]
In the second embodiment, the cotter bars 6, 8 of the first and second PCa members 1, 2, the joint bar 9, and the joint bar 13 of the third PCa member 12 are surrounded by the constraint bar 10, By the hardened concrete or mortar in the restraining bars 10, the same operation and effect as in the first embodiment can be obtained, and the first and second PCa members 1 and 2 and the third PCa member 12 can be combined. Can be connected firmly.
[0051]
Further, according to the second embodiment, the joint bar 13 of the third PCa member 12 can also serve as a hanging hook.
In the second embodiment as well, the joint streaks 9 may be eliminated, and even in this case, joining with sufficient strength is possible.
[0052]
7 and 8 show a third embodiment.
[0053]
The third embodiment is a modification of the joint bar 13 in the third PCa member 12 as the PCa wall plate in the second embodiment.
[0054]
That is, the connecting muscle 13 is an L-shaped connecting muscle 14 formed of one leg muscle 14a and a front muscle 14b, and two such muscles are arranged as shown in FIG. 14b is formed by bending the front muscle 9a of one joint muscle 9 arranged in the same manner as in the second embodiment so as to be locked to the opposite side.
[0055]
Since other structures are the same as those of the second embodiment, the same portions are denoted by the same reference numerals and description thereof will be omitted.
[0056]
In the third embodiment, the same operation and effect as those of the second embodiment can be exhibited, and the relative movement of the joining side surfaces of the first, second, and third PCa members 1, 2, and 12 in the longitudinal direction is also reduced. It is possible to further increase the bonding strength.
[0057]
9 and 10 show a fourth embodiment.
[0058]
In the fourth embodiment, the joint muscle 9 in the third embodiment is eliminated, and the front muscles 14b of the two joint muscles 14 are obliquely inserted into the front muscles 6b, 8b of the cotter muscles 6, 8. It is bent downward, and one joint bar 14 is locked to the front bar 6b of one cotter bar 6, and the other joint bar 14 is locked to the front bar 8b of the other cotter bar 8.
[0059]
Since other structures are the same as those of the third embodiment, the same portions are denoted by the same reference numerals and description thereof will be omitted.
[0060]
In the fourth embodiment, the same operation and effect as those of the second embodiment can be exhibited. Of the PCa members 1 and 2 can be prevented from moving in the relative separating direction, and the joining strength can be increased without using the joint bars 9.
[0061]
In each of the above embodiments, the restraining muscle 10 is a spiral muscle, but the restraining muscle 10 may be an endless ring made of a reinforcing steel as shown in FIGS. In this case, for example, as shown in FIG. 12, a spacer 15 is arranged on the bottom surface of the cutouts 3, 4, a ring-shaped restraining bar 10 is disposed on the spacer 15, and A ring-shaped restraining bar 10 is arranged.
[0062]
Further, the joint structure of the first embodiment shown in FIGS. 1 to 4 may be used for joining a PCa wall to a PCa wall, and the second embodiment shown in FIGS. 5 and 6 and FIGS. And the third embodiment shown in FIG. 8 and the fourth embodiment shown in FIGS. 9 and 10 may be used in a case where three PCa wall plates are arranged in a T shape and joined. Further, the joint muscle 9 and the restraining muscle 10 may be temporarily fixed with a tying muscle.
[0063]
13 and 14 show a fifth embodiment.
In the fifth embodiment, the edges of the left and right PCa floor plates are placed on the steel beam, and a large number of connecting portions (cotter portions) are provided at the joining edges of the two PCa floor plates, so that the PCa floor plates and the steel beam are connected to each other. It is an example in the case of integrating.
[0064]
In the fifth embodiment, reference numeral 21 denotes a first PCa floor plate to be bonded, 22 denotes a second PCa floor plate to be bonded, and cut-out portions 23, 24 forming cotters are provided at respective bonding edges 21a, 22a. The cutouts 23 and 24 are formed in plural numbers along the joining edge, in the example of FIG. The shape of the cutouts (cotters) 23 and 24 may be the shape shown in FIG. 22 or may be a curved line, and may have a step above and below like a cotter of a middle-layer PCa floor plate.
[0065]
The notch 23 of the first PCa floor plate 21 is provided with a loop bar 25 serving as a locking bar, and both loop bars 25 and 26 are provided at positions facing each other. Therefore, the loop streaks 25 and 26 are provided at intervals of about 200 mm in the example shown in FIG. The loop streaks 25, 26 are formed by protruding the floor streaks in the PCa floor plates 22, 23 from the edges 21a, 22a in a U-shape, but may be provided separately from the floor streaks.
[0066]
In the figure, reference numeral 27 denotes a steel beam, on which the joining edges 21a and 22a of the PCa floor plates 21 and 22 to be joined are placed on the upper surface of the steel beam 27 with the edge direction along the longitudinal direction of the steel beam 27. It is supposed to. Further, a stud 28 as a connecting bar is projected from the upper surface of the steel beam 27.
[0067]
Reference numeral 29 denotes an annular restraining bar made of a reinforcing bar, which is formed by a long spiral bar in the embodiment shown in FIGS. The diameter of the restraining streaks 29 is determined by the distance between the front streaks 25a and 26a of the loop streaks 25 and 26 when the PCa floor plates 21 and 22 are opposed to each other on the steel beam 27 as shown in FIGS. It is formed to a diameter that can be surrounded. In the illustrated example, the diameter is formed so as to surround the upper part of the stud 28. Further, the spiral streak 29 is formed to be long so as to be commonly inserted into a large number of loop streaks 25, 26 arranged in the longitudinal direction of the joint edges 21a, 22a of the PCa floor plates 21, 22. .
[0068]
Next, the joining of the PCa floor boards in the fifth embodiment will be described.
First, at the site, as shown in FIGS. 13 and 14, the first PCa floor plate 21 and the second PCa floor plate 22 are placed so that the loops 25 and 26 projecting therefrom are opposed to each other. It is placed on the steel beam 27 such that a predetermined gap 30 is formed between the floor plates 21 and 22. The stud 28 protruding from the steel beam 27 is located in the gap 30 between the PCa floor plates 21 and 22.
[0069]
Next, a restraining muscle 29 made of a spiral muscle is inserted into the gap 30 while rotating from a side end opening in the gap 30, and as shown in the figure, the restraining muscle 29 is connected to the front ends of the loop muscles 25 and 26. It is arranged so as to surround the upper portions of the studs 25a and 26a.
[0070]
Next, concrete or mortar is poured into the gap 30 formed between the joint edges 21a and 22a of the PCa floor boards 21 and 22, and the concrete and mortar are cured and hardened.
[0071]
When the concrete or mortar hardens, the microcracks at the initial stage enter the center of the joint as in the previous embodiment due to the confining effect of constraining the concrete or mortar by the spiral spiral streak (restraining streaks) 29 in the form of a tag. Therefore, the breaking line does not pass through the center of the joint, and the maximum strength of the joint can be improved.
[0072]
In addition, since the PCa floor plates 21 and 22 and the welding between the PCa floor plates 21 and 22 and the steel beam 27 are not required, the construction cost can be reduced as compared with the case of welding. In addition, the construction is simplified, and there is no artificial variation in reliability.
[0073]
15 and 16 show a sixth embodiment.
In the sixth embodiment, instead of the loop bars 25 and 26 in the fifth embodiment, as shown in FIG. 15 and FIG. Are projected from the joint edges 21a, 22a, and nuts 33, 34 with large-diameter heads are fixed to the projected portions to form locking streaks. The spiral streak 29 has a diameter surrounding the heads of the nuts 33 and 34 and the upper part of the stud 38. Instead of the threaded rebars 31 and 32 with nuts, rebars having a large-diameter head at the tip end may be protruded like the shape of the stud.
[0074]
Since the other structure is the same as that of the fifth embodiment, the same parts as those described above are denoted by the same reference numerals and the description thereof will be omitted.
[0075]
Also, in the sixth embodiment, both the PCa floor plates 21 and 22 and the steel beam 27 are joined by the same construction method as the fifth embodiment.
[0076]
With the above structure and construction method, the sixth embodiment can exhibit the same operation and effect as the fifth embodiment.
[0077]
17 and 18 show a seventh embodiment.
The seventh embodiment is different from the fifth embodiment shown in FIGS. 13 and 14 in that, instead of the spiral muscle 29 as the restraining muscle, an annular restraining muscle surrounding each of the opposed loop muscles (locking muscles) 25 and 26 is used. 40. In other words, a short spiral muscle is used as a restraining muscle that is rotated from above the loop muscles 25 and 26 to fit around the front muscles 25a and 26a of the opposing loop muscles 25 and 26, and the opposing loop muscles 25 and 26 are used. Are set as pairs, and are installed for each pair. The restraining bars 40 are also formed so as to surround the upper portions of the studs 28, 28.
[0078]
Since the other structure is the same as that of the fifth embodiment, the same parts as those described above are denoted by the same reference numerals and the description thereof will be omitted.
[0079]
Also in the sixth embodiment, the PCa floor plates 21 and 22 and the steel beam 27 are joined by the same method as that of the fifth embodiment (however, the method of fitting the restraining bars 40 is different).
[0080]
With the above-described structure and method, the seventh embodiment can exhibit the same operation and effect as the fifth embodiment.
[0081]
In the seventh embodiment, the restraining muscle 40 may be an endless ring as shown in FIGS. 11 and 12 without using the spiral muscle.
[0082]
In the fifth embodiment shown in FIGS. 13 and 14 and the seventh embodiment shown in FIGS. 17 and 18, if the loop streaks 25 and 26 are bound by U-shaped streaks, the joining strength can be further increased.
[0083]
In addition, in the embodiment shown in FIGS. 13 to 18, the steel beam 27 may be replaced with a RC or full PCa or half PCa beam or wall.
[0084]
Further, although the embodiments shown in FIGS. 13 to 18 have been described as examples in which the PCa floor plates are joined together, the joining structure and method of this embodiment may be used for joining PCa members other than the PCa floor plates.
[0085]
【The invention's effect】
As described above, according to the first or third aspect of the present invention, two PCa members can be firmly joined without requiring on-site welding. Therefore, the elimination of on-site welding makes it possible to save the construction cost and eliminate the shortage of skilled welding workers. Further, the construction is simplified without the need for skill, and the variation in the reliability of the work is extremely reduced.
According to the fourth aspect of the invention, the bonding strength can be further increased.
[0086]
Further, according to the invention of claim 5, three PCa members can be joined while exhibiting the above effects.
[0087]
According to the invention of claim 6, furthermore, the relative movement of the joining surfaces of the three PCa members in the longitudinal direction can be prevented, and the joining strength can be further increased.
[0088]
According to the invention of claim 7, it is possible to join the three PCa members while exhibiting the above-mentioned effects without using joint bars.
[0089]
Further, by forming the restraining muscle with a spiral muscle or a ring as in the inventions of claims 8 and 9, the confined effect can be surely exerted.
[0090]
Further, according to the second aspect of the present invention, the two PCa members and the beam or the wall can be firmly joined by the above-described confined effect.
[0091]
Further, according to the tenth aspect of the present invention, the above-mentioned on-site welding is eliminated, thereby reducing the cost of work, eliminating the shortage of skilled welding workers, and reducing the variation in the artificial reliability, thereby lowering the two PCa floor boards on the beams. And the two PCa floor boards and beams can also be integrated.
[0092]
Further, the reinforcing bar according to the eleventh and twelfth aspects of the present invention also functions as a locking bar exhibiting the above effect.
Further, according to the invention of claim 13, the proof stress can be further improved.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a first embodiment in which the present invention is applied to the joining of PCa floorboards, and does not show concrete or mortar to be poured on site.
FIG. 2 is a plan view of FIG.
FIG. 3 is a sectional view taken along line AA in FIG. 1;
FIG. 4 is a sectional view of FIG. 3 in which concrete or mortar is cast in a notch.
FIG. 5 is a perspective view showing a second embodiment in which the present invention is applied to the joining of two PCa floor boards and one PCa wall board, and does not show concrete or mortar to be cast on site.
FIG. 6 is a sectional view taken along line BB in FIG. 5;
FIG. 7 is a perspective view of a third embodiment showing a modification of the joint muscle in the second embodiment of FIG. 5;
FIG. 8 is a sectional view taken along line CC in FIG. 7;
FIG. 9 is a perspective view showing a fourth embodiment in which the present invention is applied to the joining of two PCa floor boards and one PCa wall board, and does not show concrete or mortar to be cast on site.
FIG. 10 is a sectional view taken along line DD in FIG. 9;
FIG. 11 is a perspective view showing an embodiment of the present invention in which a restraining bar is a ring, and does not show concrete or mortar to be cast on site.
FIG. 12 is a sectional view taken along line EE in FIG. 11;
FIG. 13 is a plan view of a fifth embodiment in which the present invention is applied to a structure in which two PCa floor boards are integrally joined on the upper surface of a steel beam, and concrete or mortar to be cast on site is not described.
FIG. 14 is a sectional view taken along line FF in FIG. 13;
FIG. 15 is a sixth embodiment showing a modification of the locking bar in FIG. 13, and does not describe concrete or mortar to be cast on site.
FIG. 16 is a sectional view taken along line GG in FIG.
FIG. 17 is a plan view showing a modification of the restraining bars in FIG. 13, in which concrete or mortar to be cast on site is not described.
18 is a sectional view taken along line HH in FIG.
FIG. 19 is a perspective view showing a conventional first joining structure, in which concrete or mortar to be cast on site is not shown.
FIG. 20 is a plan view of FIG. 19;
FIG. 21 is a sectional view taken along line JJ in FIG. 20;
FIG. 22 is a plan view showing a second conventional joint structure, in which concrete or mortar to be cast on site is not shown.
FIG. 23 is a sectional view taken along the line KK in FIG. 22;
[Explanation of symbols]
1 First PCa member
2 Second PCa member
1a, 2a Joining side
3, 4 Notch
6,8 Cotta muscle, the anchoring muscle
6a, 8a leg muscle
6b, 8b Anterior muscle that is a locking part
9 Joint muscle
10 Restraining muscles
11 Concrete or mortar cast on site
12 Third PCa member
13 Joint muscle
13a leg muscle
13b front muscle
21,22 Precast concrete floorboard
25,26 Loop muscle that is the anchoring muscle
25a, 26a Anterior muscle that is a locking part
27 steel beam
28 studs that are joints
29,40 Spiral muscle that is a restraining muscle
33,34 Nut of screw rebar as anchoring bar

Claims (13)

The first precast concrete member and the second precast concrete member which are joined to each other are provided with locking bars protruding from the respective joining side ends so as to face each other. The annular restraining bar is arranged so as to surround both the locking portions of the opposed locking bar, and the locking bar and the restraining bar are buried between the joining side ends of the two precast concrete members to be bonded. A joint structure for precast concrete members, wherein concrete or mortar is cast in such a manner as to be made. At the joint between the two precast concrete members, a support member made of a beam or a wall for supporting the two members is arranged, and a joint bar projecting to the vicinity of the anchoring bar is provided on the upper surface of the support member, and a ring is provided. Are arranged so as to surround both the engaging portions of the opposing anchoring bars and the upper part of the connecting bar, and the connecting bar and the connecting bar are provided between the joining side ends of the two precast concrete members to be joined. The joint structure for precast concrete members according to claim 1, wherein concrete or mortar is cast so that the joint bars are buried. Notches are formed in the first precast concrete member and the second precast concrete member which are arranged and joined in the same direction, and the joint side surface and the front surface side are opened, and the U-shaped cotter streaks are formed in both notches. Are projected so that the respective front muscles are opposed to each other, and an annular restraining muscle is arranged so as to surround the outer circumference of the front muscle of the cotter muscle, and the notched portion includes the cotter muscle and the restraining muscle. A joint structure for precast concrete members, wherein concrete or mortar is cast to be buried. Notches are formed in the first precast concrete member and the second precast concrete member which are arranged and joined in the same direction, and the joint side surface and the front surface side are opened, and the U-shaped cotter streaks are formed in both notches. Are projected so that the respective front muscles are opposed to each other, and a U-shaped joint muscle is arranged so as to straddle the front muscles of the two cotter muscles, and an annular restraining muscle is formed of the joint muscle. A joint structure for a precast concrete member, wherein the joint is arranged so as to surround an outer periphery, and concrete or mortar is cast into the notch so as to bury the cotter streaks, joint streaks, and restraining streaks. Notches are formed in the first precast concrete member and the second precast concrete member which are arranged and joined in the same direction, and the joint side surface and the front surface side are opened, and the U-shaped cotter streaks are formed in both notches. Are projected so that the respective front bars oppose each other, and a U-shaped joint bar is projected from the joint side surface of the third precast concrete member orthogonal to the first and second precast concrete members. Then, the front bar of the connecting bar is inserted between the connecting side surfaces of the first and second precast concrete members, and the U-shaped joint bar passes through the front bar of the connecting bar and the front bar of the both cotter bars. It is arranged so as to straddle the muscle, and an annular restraining muscle is arranged so as to surround the outer periphery of the joint muscle and the joint muscle. Joint structure precast concrete members, characterized by pouring the concrete or mortar so as to bury the. 6. The precast according to claim 5, wherein the U-shaped joint bar is formed by two substantially L-shaped joint bars, and a front muscle of the two joint bars is engaged with a front muscle of the joint bar. Concrete member joining structure. Notches are formed in the first precast concrete member and the second precast concrete member which are arranged and joined in the same direction, and the joint side surface and the front surface side are opened, and the U-shaped cotter streaks are formed in both notches. And two substantially L-shaped joints are provided on the joint side surfaces of the third precast concrete member orthogonal to the first and second precast concrete members. A bar is projected, and the front bar of the one connecting bar is locked to the front bar of the cotter bar in the first precast concrete member, and the front bar of the other connecting bar is connected to the cotter bar in the second precast concrete member. The anterior muscle is anchored, and an annular restraining muscle is arranged so as to surround the outer circumference of the anterior muscle of the cotter muscle and the joint muscle. Joint structure precast concrete members, characterized by pouring the concrete or mortar to. The joint structure for a precast concrete member according to any one of claims 1 to 7, wherein the restraining bar is formed by a spiral bar. The joint structure for a precast concrete member according to any one of claims 1 to 7, wherein the restraining bar is formed by an endless ring. A joint end of the first precast concrete slab and the second precast concrete slab is placed on the upper surface of the beam, and a locking bar projecting from each joint side end is joined to both of the precast concrete slabs. A plurality of joints are provided in the longitudinal direction of the side end, and a locking portion is provided at the tip of the locking bar. -Shaped restraining bars are arranged so as to surround the locking portions of the plurality of locking bars disposed in the longitudinal direction of the connection side end and the upper portion of the connection bar, and the connection side of both precast concrete floorboards to be bonded. A joint structure for a precast concrete member, wherein concrete or mortar is cast between the retaining bars, the restraining bars, and the connecting bars. The joint structure of a precast concrete member according to claim 10, wherein a U-shaped reinforcing bar is used as the locking bar. The joint structure of a precast concrete member according to claim 10, wherein a reinforcing bar having a large diameter head at a tip portion is used as the locking bar. 13. The non-shrinkage mortar or fiber-reinforced mortar used as the concrete to be cast between the joints using non-shrinkage concrete or fiber-reinforced concrete as the concrete to be cast between the joints. Joint structure of precast concrete members.

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