JP2007217869A - Structure for joining precast concrete walls together - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely join precast concrete walls together, without relying on a welder's skill, by firmly joining them without welding them on a job site. <P>SOLUTION: In this joint structure for joining the plurality of precast concrete walls 1 and 2 together via one joint, recessed cotters 4 and 6 are formed at the joint ends of the precast concrete walls 1 and 2 in such a shape as to be in positions almost as high as each other, respectively; joint bars 5 and 7 protruding from the cotters 4 and 6 are provided on the precast concrete walls, respectively; bent bars 5a and 7a, which are bent in either of upward and downward directions, are formed at the protruding ends of the joint bars 5 and 7, respectively; a spiral bar 10 is arranged in such a manner as to enclose the outer peripheries of the plurality of bent bars; and joint concrete 11 is placed at the joint between the precast concrete walls so that the cotters, the bent bars and the spiral bar can be embedded in the joint concrete. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a joint structure between precast concrete walls.

  Conventionally, as a method of joining a precast concrete (hereinafter also referred to as PCa) wall and a PCa wall, insertion bars project from the end faces of the PCa walls to be joined, and the end faces of both PCa walls are brought close to each other. Then, the two insertion bars protruding from both PCa walls are welded through the splicing bars to fix the mutual movement of the walls, and then the joint concrete is poured into the joint portion of the welded PCa walls. There is known a method of joining the two.

  In the conventional joining method of PCa walls, since welding of reinforcing bars is required when assembling both PCa walls at the site, a welding expert is required at the site, and welding is performed depending on the skill of the welder. Variations may also occur, and welding may be difficult in rainy weather.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems by allowing PCa walls to be joined together without using welding.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a joining structure in which a plurality of precast concrete walls are joined at one joint, and a concave cotter is provided at the joint end of each precast concrete wall. The cotters are formed so that they are at substantially the same height as each other, and each precast concrete wall is provided with a joint bar projecting from the cotter portion, and one end in the vertical direction is provided at the projecting end of each joint bar. The bent concrete bars are bent, and the spiral bars are arranged so as to surround the outer circumferences of the plurality of bent bars, and the cotter, the bent reinforcing bars, and the spiral bars are embedded in the joint portion of the precast concrete wall. It is characterized by laying.

  In the present invention, by placing joint concrete such as concrete or mortar at the joint in the field, the spiral stirrer acts like a hoop, and the confinement effect causes microcracks to join at the initial stage. Entering is suppressed, and the fracture line does not pass through the center of the joint. In addition, the concrete covered with spiral bars restrains the reinforcing bars without breaking. Therefore, the maximum strength of the joint can be improved without using welding.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, a vertical joint line is erected at the joint, and the vertical joint line is arranged inside the spiral line. is there.

  In the present invention, the strength of the joint can be improved by arranging the vertical joint bars also inside the spiral bars.

  The invention according to claim 3 is the precast concrete wall joint structure according to claim 1 or 2, wherein a tapered surface that opens from the joint end surface of the precast concrete wall toward one of the front and back surfaces of the precast concrete is provided. The pre-cast concrete wall is formed over the entire length in the vertical direction, and the cotter is partially formed on the tapered surface.

  According to the present invention, the concrete filling port cut out in the joint portion by the tapered surface is formed, and the spiral streak insertion and placement work can be easily performed through the filling port, and the joint concrete can be easily placed.

  The invention according to claim 4 is a joint structure in which a plurality of precast concrete walls are joined at one joint, and a concave cotter is formed at the joint end of each precast concrete wall, and the cotters have substantially the same height. Each precast concrete wall is provided with a joint bar protruding from the cotter part, and a bent reinforcing bar bent in one direction in the vertical direction is formed at the protruding end of each joint bar. In addition, joint bars having legs bent in one of the vertical directions are arranged at both ends between the joint surfaces of the opposing precast concrete, and spiral bars so as to surround the legs of the joint bars and the outer periphery of the bending rebar. The joint concrete is placed so that the cotter, the bending rebar, and the spiral rebar are embedded in the joint portion of the precast concrete wall. Is shall.

  Also in the present invention, the same actions and effects as those of the first aspect of the invention can be exhibited.

  According to the present invention, when the joint concrete is hardened, the concrete inside the spiral bar is constrained by the spiral bar surrounding the outer periphery of the plurality of bending reinforcing bars protruding from the plurality of precast concrete walls to be joined, and by the confining effect, Microcracks at the initial stage are prevented from entering the joint, and the fracture line does not pass through the center of the joint. In addition, the concrete covered with spiral bars restrains the reinforcing bars without breaking. Therefore, the maximum strength of the joint can be improved.

  In this way, by joint concrete, the precast concrete to be joined is firmly integrated, so welding at the joint becomes unnecessary, regardless of the weather, and without depending on the skill of the welder, and the joint part It is not necessary to arrange a special welder on site.

  Furthermore, since it does not depend on the skill of the welder, it can be reliably performed by a normal worker.

  BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out the present invention will be described based on an embodiment shown in the drawings.

1 to 4 show a first embodiment.
Example 1 shows a joining structure when PCa walls are arranged in a straight line when viewed from above, and FIG. 1 is a front view showing a joining state of two PCa walls. FIG. 2 is an enlarged plan sectional view taken along line AA in FIG. 3 is a view as seen from the BB line side in FIG. 2 and is not filled with joint concrete, and FIG. 4 is a view as seen from the CC line side in FIG. 2 and is not filled with joint concrete. is there.

  As shown in FIG. 2, the shape of the joining end surface of one PCa wall 1 is such that the end surface 1b is perpendicular to the axis of the PCa wall main body 1a and expands from the inside of the end surface 1b to one of the front and back surfaces. It consists of the formed taper surface 1c. The joint end surface shape of the other PCa wall 2 also includes an end surface 2b orthogonal to the axis of the PCa wall main body 2a, and a tapered surface 2c formed so as to expand from the inside of the end surface 2b to one of the front and back surfaces. Consists of. The tapered surfaces 1c and 2c are formed over the entire length of both PCa walls 1 and 2 in the vertical direction.

  When both the PCa walls 1 and 2 are joined as shown in FIG. 1, a joint concrete filling portion (space) 3 opened in a trumpet shape is formed by the both tapered surfaces 1c and 2c. ing. The opening width of the filling portion 3 is formed such that a concrete filling operation into a cotter portion, which will be described later, and a spiral line, which will be described later, can be inserted.

  As shown in FIG. 1, cotters 4 are partially formed on the tapered surface 1 c of the one PCa wall 1 at a predetermined interval in the vertical direction of the PCa wall 1. The cotter 4 is formed in a concave shape having an opening on the tapered surface 1c side. The length of the cotter 4 in the vertical direction is about 200 mm, and a plurality of cotters 4 are formed in the vertical direction of the PCa wall 1 at intervals of about 200 mm.

  In each cotter 4 part, a joining bar 5 fixed in the body of one PCa wall 1 is projected, and the front part of the joining bar 5 is bent upward in the filling part 3. A spiral reinforcing bar, which will be described later, is engaged with the bending reinforcing bar 5a above the connecting reinforcing bar 5.

  A cotter 6 similar to the cotter 4 is formed on the tapered surface 2c of the other PCa wall 2 and a joint bar 7 similar to the joint bar 5 is provided. Further, a bent reinforcing bar portion 7a bent upward in the filling portion 3 is formed.

  As shown in FIGS. 1 and 2, the cotters 4 and 6 of both the PCa walls 1 and 2 are formed so as to face each other at substantially the same height at the time of joining. 7, the protruding length is set so that the bent reinforcing bar portions 5a and 7a are close to each other at the time of joining.

  The vertical joint bars 8 shown in FIG. 2 are fixed to the foundation or the like at the joint portion between the PCa walls 1 and 2 and are formed in a single shape over the entire length of the PCa walls 1 and 2. Has been.

  When the PCa walls 1 and 2 are installed at the joint position, the bent reinforcing bar portions 5a and 7a and the vertical joint bar 8 are arranged at positions close to each other as shown in FIG. It has become.

  A spiral bar 10 has an inner diameter formed to a diameter that can surround the outside of the bending reinforcing bars 5a and 7a and the vertical joint bar 8, and its vertical length is as shown in FIGS. The cotters 4 and 6 are formed slightly longer than the vertical length. And this spiral reinforcement 10 is arrange | positioned so that both bending rebars 5a and 7a and the vertical joint reinforcement 8 may be enclosed in the filling part 3 in which each said cotter 4 and 6 parts are located.

Next, the joining process of both PCa walls 1 and 2 will be described.
First, at the joining position of both PCa walls 1 and 2, the vertical joint bar 8 is fixed and erected on the foundation or the like.

  Next, as shown in FIG. 1, both PCa walls 1 and 2 are arrange | positioned on the upper surfaces, such as a foundation, in the joined state.

  Next, the spiral bar 10 is inserted from the concrete filling portion 3 and the spiral bar 10 is rotated so that one end of the spiral bar 10 is positioned on the outer circumferences of the bent reinforcing bar parts 5a and 7a and the vertical joint bar 10, and The spiral bar 10 is rotated, and the entire length of the spiral bar 10 is arranged on the outer circumferences of the bending reinforcing bars 5a and 7a and the vertical joint bar 8 as shown in FIGS. A part of the spiral muscle 10 arranged in this way is locked to one of the joint muscles 5 and 7, and the arrangement state is maintained.

  Similarly to the above, the spiral bars 10 are also arranged on the bending rebars 5a and 7a and the vertical joint bars 8 in the other cotters 4 and 6 formed in the vertical direction.

Further, the joint material 12 is filled between the PCa walls 1 and 2.
Next, a concrete formwork (not shown) is arranged outside the filling part 3, and ready-mixed concrete enters the concrete formwork (within the filling part 3) from the upper part of the joint between the PCa walls 1 and 2. (Joint concrete) 11 is cast and filled.

  By filling the ready-mixed concrete 11, the concrete 11 is filled in the cotters 4 and 6, the inside and outside surrounded by the spiral streak 10, and the entire filling portion 3 parts.

Then, after curing and hardening the filled concrete, the mold is removed.
As described above, when the concrete is hardened, the concrete inside the spiral bar 10 is constrained by the spiral bars 10 that surround the outer circumferences of the bending reinforcing bars 5a and 7a and the vertical joint bars 8, and the confinement effect causes the initial stage. It is suppressed that the microcrack at the center enters the center of the joint, and the fracture line does not pass through the center of the joint. In addition, the concrete covered with spiral bars restrains the reinforcing bars without breaking. Therefore, the maximum strength of the joint can be improved.

  Further, in the joining of the PCa walls, the on-site welding is eliminated, so that the labor cost can be reduced as compared with the case of welding. Furthermore, no welder is required, and it is not necessary to rely on the skill of the welder, and it is not necessary to arrange a special welder for the joint only on site.

  Therefore, reliable construction can be performed by a normal worker without depending on the skill of the welder.

5 to 8 show a second embodiment.
Example 2 shows a joint structure when three PCa walls are arranged in a T shape when viewed from above, FIG. 5 is a plan sectional view, and FIG. 6 is a first PCa wall 21 and a second PCa. FIG. 7 is a view of the wall 22 as viewed from the line D-D in FIG. 5, FIG. 7 is a view as viewed from the line EE in FIG. 5, and FIG. 8 is an end view of the third PCa wall 23.

  In the second embodiment, the first PCa wall 21 and the second PCa wall 22 are arranged linearly, and the third PCa wall 23 is arranged orthogonally at these joint portions.

  Since the first and second PCa walls 21 and 22 in the second embodiment have the same structure as the one PCa wall 1 and the other PCa wall 2 in the first embodiment, the same members and parts as those described above are used. The same reference numerals are given and description thereof is omitted.

  The third PCa wall 23 is formed with a concave cotter 24 on its joint end surface 23a. A plurality of the cotters 24 are provided at substantially the same positions as the cotters 4 and 6 of the first and second PCa walls 21 and 22. Is provided. Also on the cotter portion 24 of the third PCa wall 23, a joining bar 25 similar to that described above is provided so that the bending reinforcing bar 25a is close to the bending reinforcing bars 5a and 7a.

  Moreover, the spiral reinforcement 10 is formed in the diameter which surrounds the outer periphery of the bending reinforcement 5a, 7a, 25a provided in the three PCa walls 21, 22, and 23. As shown in FIG.

The joining process in Example 2 will be described.
First, at the joining position of the three PCa walls 21, 22, 23, the vertical joint bar 8 is fixed and erected on the foundation or the like.

  Next, as shown in FIG. 5, the three PCa walls 21, 22, and 23 are arranged on the upper surface of the foundation or the like in a state of being joined in a T shape. At this time, as shown in FIG. 5, the third PCa wall 23 is arranged with its end face 23a slightly separated from the other PCa walls 21 and 22. As a result, a filling portion (space) 3 is formed at the joining of the three PCa walls 21, 22, and 23.

  Further, the first, second, and third bending reinforcing bars 5 a, 7 a, and 25 a are disposed at positions close to each other in the filling portion 3.

  Next, the spiral reinforcement 10 is inserted from the filling portion 3 in the same manner as in the first embodiment and rotated so as to surround the three bending rebars 5 a, 7 a, 25 a and the vertical joint reinforcement 8.

The joint material 12 is filled between the PCa walls 21 and 22.
Next, a concrete formwork (not shown) is disposed outside the filling portion 3, and the ready-mixed concrete (joint concrete) 11 is placed and filled in the formwork as in the first embodiment.

  By placing the concrete, the concrete is filled in the cotters 4, 6, 24, the inside and outside surrounded by the spiral streaks 10, and the entire filling portion 3, as in the first embodiment.

And after hardening and hardening of this filled concrete 11, the said formwork is removed.
When the concrete is hardened as described above, the concrete inside the spiral bar 10 is constrained by the spiral bars 10 that surround the outer circumferences of the bending reinforcing bars 5a, 7a, and 25a and the vertical joint bars 8, and the above-described embodiment due to the confining effect. The same action and effect as 1 can be exhibited. Further, the same effect as in the first embodiment can be exhibited due to the elimination of on-site welding.

  The second embodiment is used, for example, for welding a portion indicated by X in the layout shown in FIG.

9 to 12 show a third embodiment.
The third embodiment shows a joint structure in which the PCa wall is arranged in an L shape when viewed from above. FIG. 9 is a plan sectional view, and FIG. 10 is a view of one PCa wall 31 taken along line FF in FIG. FIG. 11 is a view as seen from the GG line in FIG. 9, and FIG. 12 is a view showing the cotter portion of the other PCa wall 32.

  The shape of the joining end surface of one PCa wall 31 is the same as that of the one PCa wall 1 in the first embodiment, and a cotter and joining bars are also provided in the same manner. Therefore, in this PCa wall 31, the same part and the same member as said one PCa wall 1 are attached | subjected the same code | symbol as the above, and the description is abbreviate | omitted.

  The other PCa wall 32 is arranged orthogonal to the end face of the one PCa wall 31, and a cotter 33 is formed on a face 32 a facing the end face of the one PCa wall 31. The cotter 33 is formed in a concave shape whose side surface facing one PCa wall 31 is open, and the cotter 33 is connected to the cotter 4 of the one PCa wall 32 in the vertical direction of the other PCa wall 32. A plurality of substantially the same length and at substantially the same interval are formed, and both cotters 4, 4 and 33 are formed to face each other at substantially the same position.

  Each of the cotters 33 is provided with a joining bar 34 fixed in the body of the other PCa wall 32, and the tip of the joining bar 34 is bent upward. A spiral bar, which will be described later, is engaged with the bending bar 34a above the joint bar 34.

  Further, the bending rebar 5a of the one PCa wall 31 and the bending rebar 34a of the other PCa wall 32 are arranged between the one PCa wall 31 and the other PCa wall 32, which will be described later. 8 so as to be close to 8.

  The joint reinforcement 8 shown in FIG. 9 and FIG. 11 is fixed to a foundation or the like at the joint portion (filling portion 3) between the PCa walls 31 and 32, and is vertically raised and lowered. It is formed in a single line.

  And when both PCa walls 31 and 32 are installed in a joining position, the three of the bending reinforcing bars 5a and 34a and the longitudinal joint reinforcing bars 8 are arranged at positions close to each other as shown in FIG. ing.

  A spiral bar 10 has an inner diameter formed to a diameter that can surround the outside of the bending reinforcing bars 5a, 34a and the vertical joint bar 8, and the vertical length thereof is as shown in FIG. It is formed slightly longer than the vertical length of the cotters 4 and 33. The spiral bars 10 are arranged so as to surround the bending reinforcing bars 5 a and 34 a and the vertical joint bars 8 in the respective cotters 4 and 33.

Next, the joining process of both PCa walls 31 and 32 will be described.
First, in the joining position of both PCa walls 31 and 32, the vertical joint bar 8 is fixed and erected on the foundation or the like.

  Next, as shown in FIG. 9, both PCa walls 31 and 32 are arrange | positioned in upper surfaces, such as a foundation, in the joined state.

  Next, the spiral bar 10 is inserted from the filling portion 3 and the spiral bar 10 is rotated so that one end thereof is positioned on the outer periphery of the bending reinforcing bars 5a and 34a and the vertical joint bar 10, and the spiral bar 10 is further rotated. 10 is rotated, and the entire length of the spiral bar 10 is arranged on the outer circumferences of the bending reinforcing bars 5a and 34a and the vertical joint bar 8 as shown in FIGS. A part of the spiral muscle 10 arranged in this way is locked to one of the joint muscles 5 and 34, and the arrangement state is maintained.

  Similar to the above, the spiral bars 10 are also disposed on the bending reinforcing bars 5a and 34a and the vertical joint bars 8 in the other cotters 4 and 33 provided in the vertical direction.

The joint material 12 is filled between the PCa walls 31 and 32.
Next, a concrete mold (not shown) is disposed outside the filling portion 3, and ready-mixed concrete is introduced into the concrete mold (in the filling portion 3) from the upper part of the joint between the PCa walls 31 and 32. To fill.

  By filling the ready-mixed concrete 11, the concrete 11 is filled in the cotters 4 and 33, the inside and outside surrounded by the spiral streaks 10, and the entire filling portion 3.

Then, after curing and hardening the filled concrete, the mold is removed.
As described above, when the concrete is hardened, the concrete inside the spiral bar 10 is constrained by the spiral bars 10 surrounding the outer circumferences of the bending reinforcing bars 5a and 34a and the vertical joint bars 8, and the above-described embodiment is achieved by the confinement effect. The same action and effect as 1 can be exhibited. Further, the same effect as in the first embodiment can be exhibited due to the elimination of on-site welding.

  The third embodiment is used, for example, for joining portions indicated by Y in the layout shown in FIG.

13 to 15 show a fourth embodiment.
Example 4 shows a joint structure when four PCa walls are arranged in a cross shape when viewed from above, FIG. 13 is a cross-sectional plan view, and FIG. 14 is a diagram viewed from line HH in FIG. FIG. 15 is a view taken along line II in FIG.

  In the fourth embodiment, four PCa walls similar to the third PCa wall 23 in the second embodiment are used and arranged in a cross shape.

  That is, a plurality of concave cotters 45 to 48 similar to those described above are formed on each of the PCa walls 41 to 44 on the joint end surfaces 41a to 44a, and are opposed to each other at substantially the same position (same height). It is formed as follows.

  Further, joint bars 49 to 52 similar to those described above are projected from the respective cotters 45 to 48, and bent reinforcing bars 49a to 52a similar to those described above are formed at the tips thereof. These bending reinforcing bars 49a to 52a are provided so as to be close to each other in the filling portion 3 as shown in FIG. 13 when the PCa walls 41 to 44 are arranged in a joined state as shown in FIG. ing.

  The spiral bar 10 similar to that described above is formed to have a diameter that surrounds the outer circumferences of the four bending reinforcing bars 49 a to 52 a and the vertical joint bar 8.

The joining process in Example 4 will be described.
First, at the joining position of the four PCa walls 41 to 44, the vertical joint bars 8 are fixed and erected on the foundation or the like.

  Next, as shown in FIG. 13, the four PCa walls 41 to 44 are arranged on the upper surface of a foundation or the like in a state of being joined in a cross shape. At this time, as shown in FIG. 13, each PCa wall 41-44 is arrange | positioned in the position in which each end surface 41a-44a left | separated from the side surface of the other PCa wall a little. Thereby, the filling part (space) 3 is formed between the joining end surfaces 41a-44a of the four PCa walls 41-44.

  Further, the bending rebars 49a to 52a of the joint bars 49 to 52 and the vertical joint bars 8 provided on the PCa walls 41 to 44 are arranged close to each other in the filling portion 3 as shown in FIG.

  Next, while inserting the spiral reinforcement 10 from the filling part 3, it rotates like the said Example 1, and arrange | positions so that the four bending rebars 49a-52a and the vertical joint reinforcement 8 may be enclosed.

  Next, a concrete formwork (not shown) is disposed outside the filling portion 3, and ready-mixed concrete (joint concrete) 11 is placed and filled in the formwork as in the above embodiment.

  By placing the concrete 11, the concrete 11 is filled in the cotters 45 to 48, the inside and outside surrounded by the spiral streaks 10, and the whole of the filling portion 3 as in the first embodiment.

Then, after curing and hardening the filled concrete, the mold is removed.
As described above, when the concrete is hardened, also in the fourth embodiment, the same operations and effects as the first embodiment are exhibited.

  The fourth embodiment is used, for example, for joining portions indicated by Z in the layout shown in FIG.

16 to 18 are modifications of the fourth embodiment.
In the fifth embodiment, the protruding amount of the joint bars 49 to 52 in the fourth embodiment is reduced, and the bending reinforcing bars 49 a to 52 a of the joint bars 49 to 52 are not brought close to the vertical joint bars 8, and each PCa wall. It arrange | positions near the end surfaces 41a-44a of 41-44.

  The two U-shaped joint bars 55, 56 are arranged in a cross shape with the legs 55a, 55a, 56a, 56a facing downward, and the legs 55a of one joint bar 55, 55a is arranged so as to be close to the bending reinforcing bars 49a, 51a at the opposite positions, and the leg portions 56a, 56a of the other joint reinforcing bar 56 are close to the bending reinforcing bars 50a, 52a at the opposing positions. The spiral bars 10 are arranged on the outer circumferences of the adjacent leg portions and the bending reinforcing bars.

  Since other structures are the same as those of the fourth embodiment, the same portions are denoted by the same reference numerals and the description thereof is omitted.

The joining method of the fifth embodiment will be described.
First, as in the fourth embodiment, the vertical joint bars 8 and the PCa walls 41 to 44 are disposed.

  Next, one of the joint bars 55 is supported by hand while the legs 55a and 55a of the joint bars 55 are faced down, close to the bending rebars 49a and 51a of the opposing PCa walls 41 and 43, and the one leg 55a. The spiral bar 10 is rotated and arranged on the outer periphery of one bending reinforcing bar 49a. In addition, the other spiral bars 10 are rotated and arranged on the outer periphery of the other leg 55a and the other bending reinforcing bar 51a.

  Next, the other joint reinforcement 56 is disposed between the bending reinforcing bars 50a and 52a of the opposing PCa walls 42 and 44 different from the above, and the other spiral reinforcement 10 is rotated in the same manner as described above to rotate the leg portion 56a. The spiral rebar 10 is disposed on the outer periphery of the bending rebar 50a and on the outer periphery of the leg portion 56a and the bending rebar 52a.

  That is, as shown in FIG. 16, four bending rebars 49a to 52a are arranged at the four corners of the joint, and the two joint bars 55 and 56 are arranged in a cross shape. The leg portions 55a and 56a of the muscles 55 and 56 and the bending reinforcing bars 49a to 52a are brought close to each other, and the adjacent leg parts and the bending reinforcing bars are each surrounded by a single spiral muscle 10.

  Next, a concrete mold (not shown) is disposed outside the filling portion 3, and the ready-mixed concrete 11 is placed in the form in the same manner as described above.

The subsequent steps are the same as described above.
Also in the fifth embodiment, the same operations and effects as described above are exhibited.

  In each of the above embodiments, the bending reinforcing bars 5a, 7a, 34a, and 49a to 52a are bent upward, but may be bent downward.

The front view which shows Example 1 of this invention. FIG. 2 is an enlarged cross-sectional view taken along line AA in FIG. 1. The figure seen from the BB line side in FIG. 2, and the figure which has not laid joint concrete. The figure seen from the CC line side in FIG. 2, and the figure which has not laid joint concrete. The Example 2 of this invention is shown, and the plane sectional view of a junction part. The figure seen from the DD line side in FIG. 5, and the figure which has not laid joint concrete. The figure seen from the EE line | wire side in FIG. 5, and the figure which has not laid joint concrete. FIG. 6 is an end view of the third PCa wall 23 in FIG. 5. The Example 3 of this invention is shown, and the plane sectional view of a junction part. FIG. 10 is an end view of the PCa wall 31 viewed from the FF line side in FIG. 9, in which no joint concrete is placed. The figure seen from the GG line | wire side in FIG. 9, and the figure which has not laid joint concrete. The figure which shows the cotter part of one PCa wall 32 in FIG. The Example 4 of the present invention is shown, and a plane sectional view of a joined part. It is the figure seen from the HH line side in FIG. 13, and the figure which has not laid joint concrete. It is the figure seen from the II line side in FIG. 13, and the figure which has not laid joint concrete. The Example 5 of this invention is shown, and the plane sectional view of a junction part. The figure seen from the JJ line | wire side in FIG. The figure seen from the KK line | wire side in FIG. The figure which shows the arrangement | positioning side of the PCa wall to which the joining structure of this invention is applied.

Explanation of symbols

1, 2, 21, 22, 31, 32, 41-44 PCa wall 1c, 2c Tapered surface 3 Filled portion 5, 7, 25, 34, 49-52 Joint bars 5a, 7a, 25a, 34a, 49a-52a Bending Reinforcing bars 8 Vertical joint bars 10 Spiral bars 11 Joint concrete

Claims (4)

  A joint structure for joining a plurality of precast concrete walls at one joint, and forming a concave cotter at the joint end of each precast concrete wall so that the cotters are positioned at substantially the same height. Each precast concrete wall is provided with a joint bar projecting from the cotter portion, and a bent rebar bent in one of the vertical directions is formed at the projecting end of each joint bar. A joint structure of precast concrete walls, wherein a spiral reinforcement is arranged so as to surround the joint, and joint concrete is placed in the joint of the precast concrete wall so as to embed the cotter, the bending rebar and the spiral reinforcement.   The joint structure of precast concrete walls according to claim 1, wherein a vertical joint bar is erected at the joint, and the vertical joint bar is disposed inside the spiral bar.   3. The precast concrete wall joint structure according to claim 1 or 2, wherein a taper surface that opens from the joint end surface of the precast concrete wall toward one surface of the front and back surfaces of the precast concrete wall has a total length in the vertical direction of the precast concrete wall. A precast concrete wall-joining structure characterized in that the cotter is partially formed on the tapered surface.   A joint structure for joining a plurality of precast concrete walls at one joint, and forming a concave cotter at the joint end of each precast concrete wall so that the cotters are positioned at substantially the same height. Each precast concrete wall is provided with a joint bar projecting from the cotter portion, and a bent reinforcing bar bent in one of the vertical directions is formed at the projecting end of each joint bar. A joint bar having legs bent in one direction in the vertical direction is arranged between both ends, and a spiral bar is arranged so as to surround the outer circumference of the bent bar and the leg of the joint bar. Precast concrete characterized in that joint concrete is placed in the joint so as to embed the cotter, bending rebar and spiral rebar. Over door wall mutual junction structure.

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