JP3053928B2 - End connection structure and end connection method between precast concrete members - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure and a method for connecting end portions of precast concrete members.

[0002]

2. Description of the Related Art In recent years, when constructing a large-sized structure made of reinforced concrete, in order to save labor and efficiency of the reinforcing work, shorten the construction period at a construction site, etc., a reinforcing rod is previously arranged at a factory and concrete is poured. Precast concrete columns and precast concrete beams (hereinafter referred to as PCa
A large number of precast concrete members such as columns and PCa beams are produced in advance, and these PCa columns and PCa beams are produced.
Many construction methods are used in which beams and the like are connected vertically and horizontally at the construction site to assemble.

[0003] In the above-mentioned method, a PCa column is first installed at a predetermined position, and then a PCa column is placed on the PCa column.
After bridging the beams and positioning the ends of the PCa beams on the end surfaces of the PCa columns, the ends of the reinforcing bars protruding from the end surfaces of the two PCa beams facing each other are connected by a reinforcing joint. After that, concrete is poured into this connection portion.

[0004] On the outer peripheral surface of the reinforcing bar arranged on the PCa column, the PCa beam and the like, irregularities are formed to strengthen the connection with concrete. A so-called threaded rebar in which a ridge is spirally formed on the outer peripheral surface of the rebar is also an embodiment of the rebar.

FIGS. 8 and 9 show a conventional end connection structure between PCa beams, respectively, showing a state before concrete is cast. In the case of FIG. 8, the tip of the reinforcing bar 111 projecting from one PCa beam 110 to be connected and the tip of the reinforcing bar 121 projecting from the other PCa beam 120 to be connected are mortar fixing portions of the reinforcing bar joint 130. The mortar fixing portion 131 is filled with the mortar 140 so that the mortar 14
The reinforcing bars 111 and 121 and the reinforcing bar joint 130 are connected and fixed to each other via the “0”. The rebar joint 130 is the PCa beam 1
Before setting 10, 120 on the PCa column, it is inserted into one of the reinforcing bars 111, 121 in advance, moved after setting, and bridged between both reinforcing bars. This connection structure can be used even when the reinforcing bars 111 and 121 are threaded reinforcing bars.
It can also be used for ordinary reinforcing bars that are not so.

On the other hand, FIG. 9 shows a connection structure in the case where threaded reinforcing bars 112, 122 are used as the reinforcing bars of the PCa beams 110, 120.
50 are used. In this connection structure, the threaded rebar joint 1
The screw fixing portion 151 provided on the front side 50 has a double-threaded reinforcing bar 11.
2 and 122 are screwed together to form lock members 152 and 153.
To secure the connection. The threaded joint 150 and the lock members 152 and 153 are connected to the PCa beam 11.
Before setting 0, 120 on the PCa column, it is screwed into one of the threaded reinforcing bars 112, 122 in advance, and moved after setting.

[0007]

The end connection structures of the precast concrete members (PCa beams) in the prior art described above have the following disadvantages.
In the connection structure shown in FIG. 8, it is necessary to increase the insertion length of the reinforcing bars 111 and 121 into the reinforcing bar joint 130 in order to secure the connection strength of the mortar 140 necessary for preventing the reinforcing bars from coming off. , 121
Becomes longer. Therefore, the PCa beams 110, 1
When equipped with a 20, it has a drawback that between PCa beam end plane distance L ₁ is very long.

The reinforcing bars 111 and 121 and the reinforcing bar joint 130
In order to obtain a predetermined bonding force between the mortar 140 and the mortar 140, the mortar 140 needs to have a predetermined thickness, and the outer diameter of the rebar joint 130 must be increased accordingly. Then, after the iron rod connecting the concrete at this connection when Da設, head thickness D ₁ of the concrete against rebar joint 130 has a drawback that can not be secured required dimensions.

On the other hand, in the case of the connection structure shown in FIG. 9, since the threaded reinforcing bars 112 and 122 and the threaded joint 150 are connected and fixed by screwing, the insertion of the threaded reinforcing bars 112 and 122 into the threaded joint 150 is performed. Even if the length is relatively short, a sufficient connection strength can be obtained. Therefore, the projecting length of the screw rebars 112 and 122 is
1,121 can be made shorter than that of, as a result, it is advantageous to be able to shorten the PCa beam end level distance L _2. Furthermore, there is for the outside diameter of the threaded rebar joint 150 can be made smaller than the reinforcing bar joint 140, an advantage that the head thickness D ₂ of the concrete for the threaded rebar joint 150 can ensure required dimensions.

[0010] However, in the connection structure shown in FIG.
In order to be able to be screwed into the screw 50, they must be arranged so that the pitch of the ridges of the two screw reinforcing bars 112 and 122 does not shift. Therefore, the positioning of the PCa beams 110 and 120 requires great care and is very troublesome. or,
Although only one reinforcing bar 112, 122 is shown in FIG. 9,
Actual PCa beams 110 and 120 have a plurality of threaded reinforcing bars 11.
2,122 are arranged. These plural screw reinforcing bars 1
When the ridge pitch of 12,122 is adjusted at the same time,
It is very difficult and there is a disadvantage that necessary measures must be taken in the process of manufacturing the PCa beams 110 and 120.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to reduce the projecting length of a screw reinforcing bar arranged on a precast concrete member. In addition, it is an object of the present invention to provide an end connection structure and an end connection method for precast concrete members which can ensure required dimensions for the cover thickness of the concrete at the connection portion and are easy to construct.

[0012]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and the gist of the invention resides in the following end connection structure and method for connecting precast concrete members. (1) at the end connecting structure of precast concrete members together threaded rebar is Haisuji therein, the Purekya
Stroke concrete members are placed away from each other,
Consists of threaded reinforcement between precast concrete members
A relay reinforcing bar is provided, and an implanted joint having a screw anchoring portion and a mortar anchoring portion is buried at one end of the precast concrete member. The precast concrete is embedded in the screw anchoring portion of the implantable joint. screw rebar manufacturing member is fixedly screwed, a mortar fixing portion has one end side of the relay rebar are inserted, and the mortar is filled for fixing the relay rebar,
Further, an end connection structure between precast concrete members, wherein the other end side of the relay reinforcing bar and a screw reinforcing bar projecting from the other precast concrete member are connected by a screw reinforcing joint.

(2) In the method of connecting the ends of precast concrete members having a threaded reinforcing bar arranged inside, a threaded reinforcing bar can be screwed into one end and an intermediate reinforcing bar is loosely inserted into the other end. A possible stud joint is previously implanted at the end of one of the precast concrete members to be connected, screwed to the end of the threaded rebar of this precast concrete member and from the end face of the precast concrete member. The relay rebar is buried in the mortar anchoring part of the joint so that it can be loosely inserted, and one end of the relay reinforcing bar consisting of a screw rebar is loosely inserted into the mortar anchoring part of the implant joint of one of the precast concrete members and connected. A threaded reinforcing bar projecting from the end face of the other precast concrete member to be formed and a threaded reinforcing bar are provided on one of the other ends of the intermediate reinforcing bar. Hands are screwed together, and the two precast concrete members are arranged and positioned so that their end faces are opposed to each other. Then, the threaded steel joint is screwed to the other precast concrete member. Screw the reinforcing bar or the other end of the relay bar to connect the relay bar and the screw bar of the other precast concrete member, and then apply mortar to the mortar fixing part of the stud joint of the one precast concrete member. A method of connecting end portions of precast concrete members, wherein the precast concrete members are filled and fixed to the precast concrete members, and concrete is poured between the ends of both precast concrete members.

(3) In the method of vertically connecting the ends of precast concrete members each having a threaded reinforcing bar arranged inside, the upper and lower ends of the upper precast concrete members to be connected are connected at the lower end and the upper end, respectively. At the lower end side, a threaded rebar can be screwed, and at the lower end side, an implantable joint into which a relay rebar consisting of a screw rebar can be loosely inserted is previously screwed and fixed to the lower end of the threaded rebar arranged in this precast concrete member. One end of the intermediate reinforcing bar is buried from the lower end surface of the precast concrete member into the mortar anchoring portion of the stud joint in a freely insertable state, and screws arranged on the lower precast concrete member to be connected are connected. The lower end of the threaded rebar joint is screwed to the upper end of the rebar, and the other end of the rebar is screwed into the upper end of the threaded rebar joint. Then, the screw rebar and the relay rebar are connected to each other, and then concrete is poured on the upper end side of the lower precast concrete member such that one end of the relay rebar projects upward, and then the upper After fitting the mortar anchoring portion of the stud joint of the precast concrete member into one end of the relay bar, filling the mortar anchoring portion with mortar and fixing the relay bar to the upper precast concrete member. A method for connecting ends of precast concrete members.

(4) In the method of vertically connecting the ends of the precast concrete members each having a threaded reinforcing bar arranged inside, the upper and lower ends of the upper precast concrete members to be connected are connected to each other. At the lower end side, a threaded rebar can be screwed, and at the lower end side, an implantable joint into which a relay rebar consisting of a screw rebar can be loosely inserted is previously screwed and fixed to the lower end of the threaded rebar arranged in this precast concrete member. In addition, one end of the intermediate reinforcing bar is buried from the lower end surface of the precast concrete member into the mortar anchoring portion of the stud joint in a freely insertable state, and a screw is attached to the upper end of the lower precast concrete member to be connected. Reinforced joints are fixed in advance with their lower ends screwed to the upper ends of screw rebars arranged in this precast concrete member. From the upper end side of the precast concrete member, the other end of the relay reinforcing bar is buried in an upper end portion of the screw reinforcing joint in a state capable of being screwed. Screwing the upper end of the screw reinforcing joint buried in the precast concrete member connects the screw reinforcing bar and the relay reinforcing bar, and then concrete is transferred to the upper end side of the lower precast concrete member by using the relay reinforcing bar. One end is projected so as to project upward, and then the mortar fixing part of the stud joint of the upper precast concrete member is fitted into one end of the relay reinforcing bar, and then the mortar is fixed to the mortar fixing part. The ends of the precast concrete members, wherein the ends are filled and fixed to the upper precast concrete members. Connection method.

[0016]

According to the present invention, the threaded reinforcing bar arranged on the precast concrete member and the relay reinforcing bar are connected by the threaded reinforcing joint. For this reason, the protrusion length of the screw reinforcing bar arranged on the precast concrete member can be shortened, and the screw required when the screw reinforcing bars of the precast concrete member are directly connected to each other by the screw reinforcing joint. It is not necessary to consider the ridge pitch of the reinforcing bar, and the connection between the precast concrete members can be made very easily.

Further, it is possible to secure a required dimension for the cover thickness of the concrete at the connection portion. In addition, screws
Reducing the protrusion length of the reinforcing bar and the mortar anchoring part
It is possible to achieve compatibility with securing the connection strength.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a state before connection of concrete at a connection portion 90 between an end of a PCa beam 1A as one precast concrete member and an end of a PCa beam 1B as another precast concrete member. The ends of both PCa beams 1A and 1B are arranged to face each other on the end surface of a PCa column (not shown).

First, regarding the PCa beam 1A, FIG.
This will be described with reference to FIG. In addition, PCa beam 1A and PCa beam 1B
Are the same in both cases, and therefore, the description of the PCa beam 1B is omitted. The PCa beam 1A includes a concrete body 10, a plurality of threaded rebars 20, a plurality of implanted joints 30, and a lock member 40, and the threaded rebar 20, the implanted joint 30, and the lock member 40 are provided.
Is embedded in the concrete body 10.

The implantable joint 30 is formed in a tubular shape, and at one end thereof is provided a screw fixing portion 31 capable of screwing the screw reinforcing bar 20, and at the other end thereof, a relay reinforcing bar whose inner diameter is described later. A mortar fixing portion 32 having a predetermined diameter larger than the outside diameter of the mortar 50 and allowing the relay reinforcing bar 50 to be loosely inserted is provided. Further, a mortar inlet 33 and an air outlet 34 communicating with the mortar fixing part 32 are provided on an outer peripheral portion of the implantable joint 30. The stud joint 30 is buried in one end of the concrete body 10, the opening end of the mortar fixing portion 32 is flush with the end face of the concrete body 10, and the axial direction thereof is along the longitudinal direction of the concrete body 10. Are located. The mortar inlet 33 and the air outlet 34 are respectively connected to the mortar inlet 13 and the air outlet 14 provided in the concrete body 10.

One end 21 of the screw rebar 20 is screwed into the screw fixing portion 31 of the implantable joint 30, and is locked by a lock member 40. The other end 22 of the screw reinforcing bar 20 protrudes from the end face on the other end side of the concrete body 10 by a predetermined dimension.

Next, the connecting reinforcing bar 50 for connecting the PCa beam and the threaded reinforcing joint 60 will be described with reference to FIG. 2B. Except for the short length, the connecting reinforcing bar 50
It is the same as the screw reinforcing bar 20 arranged on the beams 1A and 1B, and the outer diameter, the pitch of the ridges, and the like are completely the same. The screw reinforcing joint 60 has a cylindrical shape, and at the center thereof, a screw fixing portion 61 for screwing the relay reinforcing bar 50 is provided so as to penetrate along the axial direction. Note that, in FIG.
Reference numerals 1 and 72 are lock members.

Next, referring to FIG. 1, PCa beams 1A, 1A
The method of connecting the end of B will be described. PCa in the present invention
In the beam end connection structure and end connection method, PCa
The left end 11 of the beam 1A is connected to the right end 12 of the PCa beam 1B.

First, as a preparation, the right end 5
1 is screwed with the threaded steel joint 60 and the lock members 71 and 72, and further, the closing plate 80 is screwed into a position closer to the left end side than the lock member 71. Then, the left end 52 of the relay reinforcing bar 50 is inserted into the mortar fixing portion 32 of the PCa beam 1A. In FIG. 1, the upper side shows this state.

Next, the PCa beam 1A and the PCa beam 1B, in which the relay reinforcing bar 50 and the like are previously incorporated as described above, are
On the end face of the pillar, the end face of the left end 11 and the right end 1
2 so as to face the end face with a predetermined distance,
The positioning of the PCa beam 1A and the PCa beam 1B is completed.
The distance between the PCa beam 1A and the PCa beam 1B is determined by the distance between the tip of the right end 51 of the relay bar 50 and the PCa beam 1B in a state where the left end 52 of the relay bar 50 is inserted into the substantially rear end of the mortar fixing portion 32. Left end 22 of screw reinforcing bar 20
It is most preferable that a slight gap is formed between the tip and the tip.

After the positioning is completed, the lock member 72 screwed to the relay bar 50 is replaced with the screw bar 2 of the PCa beam 1B.
0 and is screwed into it. Subsequently, the screw reinforcing joint 60 screwed to the relay reinforcing bar 50 is connected to the screw reinforcing bar 20 of the PCa beam 1B in the same manner as described above.
Is screwed to the left end portion 22 of the cable, and the screw reinforcing joint 60 is bridged between the relay reinforcing bar 50 and the screw reinforcing bar 20. When the locking member 72 and the screw reinforcing joint 60 are screwed into the screw reinforcing bar 20, the pitch of each protrusion of the relay reinforcing bar 50 and the screw reinforcing bar 20 can be easily adjusted by moving the relay reinforcing bar 50 in the axial direction. Can be combined with

Thereafter, the threaded joint 60 is immobilized by tightening both lock members 71 and 72. In this way, the screw reinforcing bar 20 of the PCa beam 1B and the relay reinforcing bar 50 are reliably connected by the screw reinforcing bar joint 60.

Next, the closing plate 80 is brought into contact with the end face of the right end portion 11 of the PCa beam 1A, thereby forming the implantation joint 3.
The mortar fixing section 32 of the mortar 0 is closed. And PCa beam 1A
The mortar 73 is filled with no gap from the mortar injection hole 13 into the mortar fixing portion 32 and solidified. By fixing the left end 52 of the relay bar 50 to the stud joint 30 of the PCa beam 1A in this way, the screw bar 20 of the PCa beam 1A and the screw bar 20 of the PCa beam 1B are connected to the relay bar 50.
And via the threaded steel joint 60. In FIG. 1, the lower side shows this state.

As described above, when the threaded reinforcing joint 60 is bridged from the relay reinforcing bar 50 to the screw reinforcing bar 20 of the PCa beam 1B, the left end 52 of the relay reinforcing bar 50 is not fixed, and the relay reinforcing bar 50 is moved in the axial direction. Since it can be moved freely, the pitch of the ridge of the relay reinforcing bar 50 and the pitch of the ridge of the screw reinforcing bar 20 can be easily adjusted,
Both can be easily and reliably connected by the threaded joint 60. Therefore, PCa beam 1A,
1B connection work becomes very easy.

As described above, after all the screw rebars 20 facing each other are connected and fixed at the connecting portion 90, finally, concrete is poured between the concrete bodies 10, 10 of the PCa beams 1A, 1B. And solidify, PC
The connection between the ends of the a beams 1A and 1B is completed.

In the end connection structure of the PCa beams 1A and 1B, the screw reinforcing bar 20 arranged on the precast concrete member and the connecting reinforcing bar 50 are connected by the screw reinforcing joint 60. There are advantages (Figure 1
reference). The projecting length of the screw reinforcing bar 20 arranged on the PCa beam 1A can be shortened.
It can be shortened A, the inter-end-surface distance _{L 0} of 1B.
It is possible to secure the necessary dimensions to the concrete head thickness D ₀ at the connecting portion 90. The above advantages can also be obtained by using the conventional threaded joint 150 of FIG. However, in the case of the end connection structure shown in FIG. 4, the adjustment of the ridge pitch of the screw rebar was very troublesome. On the other hand, in the case of the end connection structure of the present invention shown in the above-described embodiment, the operation of adjusting the ridge pitch is extremely easy as described above, which is different from the end connection structure of the embodiment of FIG. Is also excellent. In addition,
Screw reinforcement of PCa beam 1B on mortar fixing part 32 of hand 30
20 is assumed to be directly inserted, the mortar fixing unit 3
To secure the connection strength by increasing the insertion depth into 2,
The protrusion length of the screw reinforcing bar 20 must be increased.
You. On the other hand, according to the present invention, the connecting reinforcing bar 50 is made longer.
The projecting length of the screw reinforcing bar 20 should be shortened.
And the connection strength between the mortar fixing part 32 and
Can be achieved.

The present invention is not limited to the above-described embodiment, and various modes can be adopted. For example, in the above-described embodiment, the screw reinforcing joint 60 is screwed to the relay reinforcing bar 50 in advance, but this may be screwed to the other end 22 of the screw reinforcing bar 20 of the other PCa beam 1B in advance. Good. Further, irregularities may be provided on the inner peripheral surface of the mortar fixing portion 32 of the implantable joint 30. This is more preferable because the connection strength between the mortar 73 and the implantable joint 30 increases.

In this embodiment, the case where the ends of the precast concrete members are connected in the left-right direction is taken as an example. However, the present invention is not necessarily limited to this. It can be applied to the case of connecting in the vertical direction. That is, FIG. 3 shows a PCa wall 1 as a lower precast concrete member.
It shows a connection structure between an end of C and an end of a PCa beam 1D as an upper precast concrete member. Note that the end connection structure of the PCa walls 1C and 1D is almost the same as the end connection structure of the PCa beams 1A and 1B described above, and therefore, the same portions are denoted by the same reference numerals and description thereof will be omitted.

Next, referring to FIGS. 4A to 4D, the PC
A method of connecting the ends of the walls 1C and 1D will be described. In the PCa wall end connection method according to the present invention, the PCa wall 1
The upper end of C is connected to the lower end of PCa wall 1D.

First, as shown in FIG.
C, the upper end of the screw reinforcing bar 20, ie, PCa
A locking member 72 and a screw reinforcing joint 6 are attached to the screw reinforcing bar 20 projecting upward from the upper end surface of the concrete body 10 of the wall 1C.
0 and the lower end. Then, as shown in FIG. 4B, the lower end of the intermediate reinforcing bar 50 is screwed into the upper end of the threaded bar joint 60. Next, the locking member 71 is
Then, the lock member 71 and the above-described lock member 72 are tightened. Thereby, the screw reinforcing bar 20 arranged on the PCa wall 1C and the relay reinforcing bar 50 are reliably connected by the screw reinforcing bar joint 60. In the connected state, the distal end of the lower end of the relay reinforcing bar 50 and the screw reinforcing bar 2 are connected.
It is most preferable that a slight gap is formed between the top end of the zero point and the top end.

Next, as shown in FIG.
Pour concrete K on the upper end side of C. When the concrete K is cast, the concrete K is cast in such a manner that the upper end portion of the intermediate reinforcing bar 50 projects upward from the upper surface of the cast concrete K. The projecting length of the relay reinforcing bar 50 projecting from the upper surface of the concrete K is substantially the same as the axial length of the mortar fixing portion 32 described above.

After the concrete K is solidified, a mortar M (hereinafter referred to as “lay mortar”) is placed on the upper surface of the concrete K.
Laying. Thereafter, as shown in FIG. 4 (D), the mortar fixing portion 32 of the stud joint 30 of the PCa wall 1D is fitted to the upper end portion of the relay reinforcing bar 50 protruding from the upper surface of the concrete K. In the fitted state, the lower end surface of the concrete body 10 of the PCa wall 1D is in contact with the upper surface of the mortar M.

Next, the mortar injection hole 13 in the PCa wall 1D
After that, the mortar fixing portion 32 is filled with the mortar 73 without any gap and solidified. As a result, the upper end of the relay reinforcing bar 50 is fixed to the implanted joint 30 of the PCa wall 1D, and the PCa
The connection between the ends of the wall 1C and the PCa wall 1D is completed (FIG. 3).
reference).

In the end connection structure of the PCa walls 1C and 1D, the screw reinforcement 20 and the relay reinforcement 50 arranged on the PCa wall 1C are connected by a screw reinforcement joint 60. For this reason, the projecting length of the screw reinforcing bar, which conventionally protrudes from the upper end surface of the concrete body 10 to the upper end of the relay reinforcing bar 50, can be greatly reduced. As a result,
For example, a conventional PCa wall and a PCa wall 1 according to the present invention
When the total length (length from the lower end surface of the concrete body to the tip of the upper end of the screw rebar) is the same as that of C, the PCa wall 1 is reduced by the length of the protrusion of the screw rebar.
The effect that the total length of the concrete body 10 of C can be lengthened and the floor height of the PCa wall 1C can be increased.

In this embodiment, the lock member 7 is attached to the screw reinforcing bar 20 protruding from the upper end surface of the concrete body 10.
2 and the threaded steel joint 60 are screwed together. Instead, as shown in FIG. 5, a concave groove 10a is formed in the upper end surface of the concrete body 10 and protrudes from the bottom surface of the groove 10a. Lock member 72 and threaded steel joint 6 on threaded steel 20
It is also possible to screw 0 with. This way,
The projecting length of the screw reinforcing bar 20 from the upper end surface of the concrete body 10 can be made substantially zero, and the floor height of the PCa wall 1C can be further increased.

In this embodiment, the lock member 7 is attached to the screw reinforcing bar 20 projecting from the upper end surface of the concrete body 10.
2 and the threaded joint 60 are screwed together, but as shown in FIG. 6, the lock member 72 and the threaded joint 60 may be embedded in the upper end of the concrete body 10 in advance. More specifically, the tip of the upper end of the screw reinforcing bar 20 arranged on the PCa wall 1C is located below the upper end surface of the concrete body 10, and the upper end of the screw reinforcing bar 20 has a lock member 72 and a screw. The lower end of the rebar joint 60 is screwed into the concrete body 10 in a state of being embedded in the upper end. The upper end of the screw reinforcing joint 60 protrudes from the upper end surface of the concrete body 10. By screwing the lower end of the relay reinforcing bar 50 into the upper end of the screw reinforcing joint 60, the screw reinforcing bar 20 and the relay reinforcing bar 50 Are connected by a threaded steel joint 60.

By doing so, the height of the above-mentioned floor height can be further increased, and at the time of connection, the lock member 72 and the screw reinforcing joint 6 are attached to the upper end of the screw reinforcing bar 20.
This eliminates the need for screwing the lower end portion with the lower end of the “0”, and has the effect of greatly improving workability at the site. still,
In this embodiment, the threaded steel joint 60 is embedded in the concrete body 10 so that the upper end thereof protrudes from the upper end surface of the concrete body 10, but as shown in FIG. The concrete body 1 is placed so that its upper end face is flush with the upper end face of the concrete body.
It is also possible to bury it at zero.

Further, the precast concrete member is not limited to the PCa beam or the PCa wall.
It may be a pillar or the like. That is, the end connection structure and the end connection method can be applied to the connection between the PCa columns and the like.

[0044]

As described above, according to the present invention, it is possible to shorten the protrusion length of the screw reinforcing bar arranged on the precast concrete member, and it is possible to reduce the size required for the cover thickness of the concrete at the connection portion. The advantage of the present invention is that it is possible to take advantage of the two great advantages of the threaded steel joint, that is, to secure the pre-cast concrete members, and that the work of connecting the precast concrete members becomes very easy. In addition, shorten the length of protrusion of the screw rebar.
And securing the connection strength with the mortar anchoring part.
Can stand upright.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an end connection structure between precast concrete beams according to the present invention, showing a state before concrete is poured into a connection portion.

2A is a cross-sectional view of a precast concrete beam, and FIG. 2B is a cross-sectional view of a joint between a connecting reinforcing bar and a threaded reinforcing bar.

FIG. 3 is a sectional view showing an end connection structure between precast concrete walls according to another embodiment of the present invention.

FIG. 4 is a view for explaining a method of connecting end portions of precast concrete walls according to another embodiment of the present invention, in which (A) shows a lock member and a screw joint at the upper end of a screw reinforcing bar. It is sectional drawing which shows the state which screwed, and (B) is sectional drawing which shows the state which connected the relay reinforcement and the screw reinforcement with the screw reinforcement joint.

FIG. 5 is a view for explaining a method of connecting end portions of precast concrete walls according to another embodiment of the present invention, showing a state in which concrete is cast on the upper end side of a lower precast concrete wall. FIG.

FIG. 6 is a view for explaining a method of connecting end portions of precast concrete walls according to another embodiment of the present invention, and fixing a mortar of a stud joint of an upper precast concrete wall to an upper end portion of a relay reinforcing bar. It is sectional drawing which shows the state which fitted the part.

FIG. 7 is a sectional view showing an end connection structure between precast concrete walls according to another embodiment of the present invention.

FIG. 8 is a sectional view showing an end connection structure between precast concrete walls according to another embodiment of the present invention.

FIG. 9 is a cross-sectional view showing an end connection structure between precast concrete walls according to another embodiment of the present invention.

FIG. 10 is a cross-sectional view showing a conventional end connection structure between precast concrete beams.

FIG. 11 is a cross-sectional view showing another conventional end connection structure between precast concrete beams.

[Explanation of symbols]

1A One PCa Beam (Precast Concrete Member) 1B The Other PCa Beam (Precast Concrete Member) 20 Screw Reinforcement 30 Stud Joint 31 Screw Fixing Part 32 Mortar Fixing Part 50 Relay Reinforcement 60 Screw Reinforcement Joint 73 Mortar 1C Lower PCa Wall (Precast concrete member) 1D PCa wall above (Precast concrete member) K concrete

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E04B 1/58 503 E04B 1/21

Claims (4)

(57) [Claims] 1. A precas having a threaded reinforcing bar arranged therein.
In the end connection structure between concrete members,The above precast concrete members are placed apart from each other
Screws between these precast concrete members
A relay bar consisting of reinforcing bars is provided,  At the end of one precast concrete member, screw
An implanted joint having a fixing section and a mortar fixing section is embedded.
The screw fixing part of this implantable joint has
Precast concrete member screw rebar is screwed and fixed
The mortar fixing sectionthe aboveOne end of the rebar is inserted
As well as the
And the other end of this relay bar
It was laid on the other precast concrete member
The reinforcing bar is connected with the threaded bar joint
Characterized by edges of precast concrete members
Connection structure. 2. A method of connecting ends of precast concrete members each having a threaded reinforcing bar arranged therein, wherein a threaded reinforcing bar is screwable at one end and a threaded reinforcing bar is formed at the other end. A pre-casting is carried out in such a manner that a loosely insertable implantable joint is previously screwed and fixed to the end of one precast concrete member to be connected to the end of the threaded reinforcing bar arranged on the precast concrete member. One end of the intermediate reinforcing bar is buried in the mortar anchoring portion of the stud joint from the end face of the concrete member so that it can be loosely inserted into the mortar anchoring portion of the stud joint of the one precast concrete member. Of one end of the threaded reinforcement or the other end of the above-mentioned relay reinforcement arranged on the other precast concrete member to be connected. A threaded rebar joint is screwed to either one, and the two precast concrete members are arranged and positioned so that their end faces face each other. Then, the threaded rebar joint is connected to the other one. Screw the threaded rebar or the other end of the relay rebar arranged on the precast concrete member to connect the relay rebar and the screw rebar, and then mortar of the stud joint of the one precast concrete member The precast concrete members are characterized in that the anchoring portion is filled with mortar to fix the relay reinforcing bar to the precast concrete members, and that concrete is poured between the ends of both precast concrete members. End connection method. 3. A method of vertically connecting ends of precast concrete members having threaded reinforcing bars arranged therein, wherein a screw is provided at a lower end of an upper precast concrete member to be connected and at an upper end side. An implantable joint to which a reinforcing bar can be screwed and a relay reinforcing bar composed of a screw bar can be loosely inserted at the lower end side, in a state where it is screwed and fixed to the lower end portion of the screw reinforcing bar arranged in advance in the precast concrete member, and One end of the intermediate reinforcing bar is buried from the lower end surface of the precast concrete member into the mortar anchoring portion of the stud joint in a freely insertable state, and a screw reinforcing bar arranged on the lower precast concrete member to be connected. The lower end of the threaded rebar joint is screwed to the upper end of the joint, and the other end of the relay rebar is screwed into the upper end of the threaded rebar joint. Then, the threaded reinforcing bar and the relay reinforcing bar are connected to each other, and then concrete is poured into the upper end side of the lower precast concrete member so that one end of the relay reinforcing bar projects upward, After fitting the mortar anchoring portion of the stud joint of the precast concrete member to one end of the relay bar, filling the mortar anchoring portion with mortar and fixing the relay bar to the upper precast concrete member. Characteristic method of connecting end parts of precast concrete members. 4. A method for vertically connecting ends of precast concrete members having threaded reinforcing bars arranged therein, wherein a screw is provided at a lower end portion of an upper precast concrete member to be connected and at an upper end side. An implantable joint to which a reinforcing bar can be screwed and a relay reinforcing bar composed of a screw bar can be loosely inserted at the lower end side, in a state where it is screwed and fixed to the lower end portion of the screw reinforcing bar arranged in advance in the precast concrete member, and One end of the intermediate reinforcing bar is buried from the lower end surface of the precast concrete member into the mortar anchoring portion of the stud joint in a freely insertable state, and a screw reinforcing bar is attached to the upper end of the lower precast concrete member to be connected. The joint is fixed in advance with its lower end screwed to the upper end of a threaded reinforcing bar arranged on the precast concrete member. The other end of the relay rebar is buried in the upper end of the threaded rebar joint from the upper end side of the recast concrete member so that the other end of the relay rebar can be screwed in. Screwed into the upper end portion of the threaded reinforcing bar joint buried in the precast concrete member to connect the threaded reinforcing bar and the relay reinforcing bar, and then put the concrete on the upper end side of the lower precast concrete member. One end of the joint is projected so as to protrude upward, and then the mortar fixing part of the stud joint of the upper precast concrete member is fitted into one end of the intermediate reinforcing bar, and then the mortar is fixed to the mortar fixing part. Characterized in that the reinforcing bars are fixed to the upper precast concrete member and the ends of the precast concrete members are Connection method.