JP6568752B2 - Precast concrete member manufacturing method and joining key connector - Google Patents

Description

  The present invention relates to a method for manufacturing a precast concrete member having joint end surfaces, and a joint key connector that can be used in the method.

  2. Description of the Related Art Conventionally, a method for manufacturing a precast concrete (hereinafter referred to as “PCa”) member that constitutes a concrete structure by dividing it and introducing prestress into a plurality of PCa members is known.

Examples of methods for integrating a plurality of PCa members include the following.
1. A plurality of PCa members are arranged with a specific interval (about 300-500 mm) with their joining end faces facing each other. Reinforcing bars and sheaths are assembled in the gaps between the joining end faces of the PCa member, and concrete is placed there to construct a joining part of the reinforced concrete structure. Thereafter, a PC steel material is disposed so as to penetrate each PCa member and the joint, and is strained to introduce prestress.

  2. A plurality of PCa members are arranged with their joint end faces facing each other with a specific interval (about 20 mm to 40 mm). Pour mortar or grout into the gap between the joint end faces of each PCa member, and after hardening the mortar or grout, place the PC steel material so that it penetrates each PCa member and joint, and introduce pre-stress (For example, refer to Patent Document 1).

3. With each PCa member in a state where the joint end faces are directly butted together, a PC steel material is disposed and tensioned to introduce prestress.
According to this method, when the adhesion degree between the joining end faces is insufficient, local stress is generated on the joining end face when prestress is applied, and there is a possibility that cracks, chips, etc. may occur. As a countermeasure against this, in order to increase the degree of adhesion between the joining end faces, the joining end face of one PCa member is used as it is for a mold, and a PCa member having a joining end face joined to the joining end face of the PCa member is placed. The “match cast method” is sometimes used (see, for example, Patent Documents 2 and 3).

  In the case of the match cast method, when joining each PCa member, there is a method of providing an unevenness (joining key) on the joining end face and fitting it to make the joining work more efficient. Document 4 discloses a technique relating to a positioning hole arranged on the joint end face and a positioning pin that fits oppositely.

JP 2001-123526 A Japanese Patent Application Laid-Open No. 08-092965 JP 08-151605 A JP 2006-169890 A

  However, in the match cast method, when the pretension PC steel material is disposed in a direction orthogonal to the joining end surfaces of the PCa members, the pretension PC stretched between the abutments of the production line. The steel material hinders the placement of the PCa member used as a formwork. Therefore, it is practically difficult to perform a match cast method in which the pretension PC steel material is disposed in a direction orthogonal to the joining end surfaces of the PCa members.

  Therefore, the joint end faces of the respective PCa members are formed with the same degree of accuracy as the match cast method using separate molds having through holes for passing the pretension PC steel material stretched between the abutments. Methods of forming are being considered.

In this method, a joining key (mesky) for joining the joining end faces of each PCa member is attached to each mold so as to be embedded in each PCa member.
However, since the joining keys (meskeys) of the respective PCa members are attached to separate molds, there is a problem that sufficient accuracy of the attachment position cannot be guaranteed. Further, even if a joining key (mesky) can be attached to each formwork with high positional accuracy, the joining of each PCa member is caused by a slight inclination of the formwork forming the joining end face of each PCa member. The central axes of the key holes of the joining keys (meskeys) arranged on the end face portions are not aligned, and depending on the degree, joining of the joining keys may be impossible. Such a failure can be a factor that greatly reduces the efficiency of the PCa member joining operation.

  In view of the circumstances as described above, an object of the present invention is to easily manufacture a PCa member having a structure in which a PC steel material for pretension is disposed in a direction orthogonal to the joining end surfaces of the PCa members. At the same time, it is an object of the present invention to provide a PCa member manufacturing method and a joining key connector that can favorably provide a joining key for joining the joining end faces to each PCa member and can shorten the work period.

In order to achieve the above object, a method for manufacturing a PCa member according to an aspect of the present invention includes:
A method for producing a first concrete member having a first joint end face and a second concrete member having a second joint end face connectable to the first joint end face,
Tensioning the PC steel material between the abutments on both ends of the production table,
A mold for the first concrete member, including a first joint end face form that forms the first joint end face on the production table, the first joint end face being spaced apart from each other by a predetermined distance in the extending direction of the PC steel material. Assembling a rebar and a formwork and rebar for the second concrete member including a second joint end face formwork forming the second joint end face;
A meschi for joining the first joint end face and the second joint end face is attached to the first joint end face mold and the second joint end face mold, and both ends of each key hole of the meskey By connecting the parts, the respective mesquees are connected to each other so that the central axes of the keyholes of the mesques are aligned with each other,
After concrete is placed in each mold and a predetermined strength is developed, the connection by the connector is released, the tension of the PC steel material is released, and prestress is introduced into the concrete.

  In the method for manufacturing a PCa member according to the present invention, a meskey for joining the first joint end face and the second joint end face is provided on the first joint end face mold and the second joint end face mold. Mounting, by connecting each of the mesquees so that the center axes of the keyholes of each of the mesquies are aligned with each other by means of a connecting tool in which both ends are inserted into the keyholes of each of the mesquees It is guaranteed that the central axes of the key holes of the Meskey embedded in each of the concrete members formed are aligned with each other. Thereby, it can avoid that the joining operation | work of the 1st concrete member and the 2nd concrete member in a laying site becomes difficult, and can shorten a work period.

Moreover, the joining key coupling tool which concerns on the other form of this invention is
Prestress is introduced using each of the PC steel materials to produce a first concrete member having a first joint end face and a second concrete member having a second joint end face that can be joined to the first joint end face. And a central axis of a key hole of a first Meskey for joining attached to a first joining end face formwork that forms the first joining end face to be embedded in the first concrete member. The center axes of the key holes of the second Meskey for joining attached to the second joining end face formwork forming the second joining end face for embedding in the second concrete member are aligned with each other. A connecting key connecting tool for connecting the corresponding mesquities to each other,
A first positioning pin having a first pin insertion portion inserted into the key hole of the first mesky and connected to the first mesky at one end and an engagement portion at the other end;
The second pin insertion portion that is inserted into the key hole of the second mesky and can be connected to the second mesky is provided at one end, and the engagement portion of the first positioning pin is provided at the other end. A second positioning pin that holds a center bolt having an axial alignment portion for engaging and aligning the axial center with the first positioning pin;
A direction confirmation coupler externally fitted to the first positioning pin so as to be movable along the axial direction of the first positioning pin;
The shaft center of the center bolt held by the second positioning pin connected to the second mesky at the engaging portion of the first positioning pin connected to the first mesky. An alignment portion is engaged to align the axes of the first positioning pin and the second positioning pin, and the direction confirmation coupler is moved to move a part of the outer periphery of the first positioning pin and the first positioning pin. By holding a part of the outer periphery of the positioning pin 2 on the inner peripheral surface of the direction confirmation coupler, the central axis of the key hole of the first mesky and the central axis of the key hole of the second mesky Are arranged in a straight line.

  In the joining key connector according to the present invention, the first pin insertion portion of the first positioning pin is inserted and connected to the key hole of the first Meskey attached to the first joining end face formwork. The direction of the central axis of the key hole of the first mesky can be managed by the first positioning pin. Similarly, since the second pin insertion portion of the second positioning pin is inserted and connected to the key hole of the second Meskey attached to the second joining end face formwork, the second Meskey key The direction of the center axis of the hole can be managed by the second positioning pin.

  Further, in this joining key connector, the engaging portion at the end portion of the first positioning pin and the shaft of the tip portion of the center bolt held by the second positioning pin so as to advance and retreat in the axial direction. The centering portion engages in the axial direction, and the position of the central axis of the first positioning pin and the position of the central axis of the second positioning pin can be matched at this engagement point. In this state, the direction confirmation coupler holds a part of the outer periphery of the first positioning pin and a part of the outer periphery of the second positioning pin, so that the first positioning pin and the second positioning pin Each central axis can be fixed in a straight line. Therefore, by using the joining key connector for manufacturing the PCa member, the central axis of the key hole of the first Meskey and the central axis of the key hole of the second Meskey are surely aligned with each other. Meskeys can be linked together.

  As described above, according to the present invention, it is possible to easily manufacture a PCa member having a structure in which a PC steel material for pretensioning is disposed in a direction orthogonal to the joining end surfaces of the PCa members. It is possible to satisfactorily provide a joining key for joining the joining end faces to the PCa member, and to shorten the work period.

It is a perspective view which shows the PCaPC floor slab of a bridge. It is sectional drawing which shows the structure of the junction part of the two PCa members 11 and 12. FIG. It is sectional drawing which shows the structure of a joining key. It is a top view of the 1st PCa member 11 and the 2nd PCa member 12 which were joined mutually. It is AA 'sectional drawing of the 1st PCa member 11 of FIG. It is BB 'sectional drawing of the 2nd PCa member 12 of FIG. FIG. 6 is a top view illustrating an example of a positional deviation between the central axes of a first mesky 41 and a second mesky 42. It is a top view which shows the example of the angle shift | offset | difference of each central axis of the 1st mesky and the 2nd mesky. It is a top view which shows the PCa member manufacturing environment in a factory. The top view which expanded the part of the formwork 50 and the formwork 60 of FIG. It is a side view of FIG. FIG. 10 is an enlarged side view showing a first joint end face mold 52 and a second joint end face mold 62 in the mold 50 and the mold 60 in FIG. 9. FIG. 6 is a cross-sectional view showing the overall configuration of a connector 80. FIG. 6 is a cross-sectional view showing an arrangement state of first positioning pins 81 on the first joining end face formwork 52. FIG. 6 is a cross-sectional view showing an arrangement state of a first mesky 41 on a first joining end face formwork 52. FIG. 6 is a cross-sectional view showing a connection state between the first Meskey 41 and a first positioning pin 81. FIG. 6 is a cross-sectional view showing a state in which a second positioning pin 82 is arranged on a second joining end face formwork 62. FIG. 6 is a cross-sectional view showing a connection state between a second mesky and a second positioning pin 82; Sectional drawing which shows the procedure which connects the 1st Meskey 41 attached to the 1st joining end surface formwork 52 and the 2nd Meskey 42 attached to the 2nd joining end surface formwork 62 using the connection tool 80. FIG. It is. FIG. 14B is a cross-sectional view illustrating a procedure for coupling following FIG. 14A. It is sectional drawing which shows the connection state using the connection tool 80 of the 1st Meskey 41 attached to the 1st joining end surface formwork 52, and the 2nd Meskey 42 attached to the 2nd joining end surface formwork 62. is there. FIG. 6 is a side sectional view of the direction confirmation coupler 84 and a side view of the direction confirmation coupler 84 as viewed in the axial direction.

  Hereinafter, an embodiment according to a method for manufacturing a PCa member and a joining key connector for manufacturing a PCa member according to the present invention will be described with reference to the drawings.

[1. About PCa members]
FIG. 1 is a perspective view showing a PCaPC floor slab of a bridge on an expressway, for example. Here, the PCaPC floor slab represents a floor slab in which PCa members are integrated by prestress (PC).
This PCaPC floor slab 1 is constructed by laying two PCa members 11 and 12 side by side in the road width direction. The two PCa members 11 and 12 laid side by side in the road width direction are integrated in a state in which the joint end surfaces 111 and 121 are in pressure contact with each other by introducing prestress in the road width direction. Of the two PCa members 11, 12, the PCa member 11 laid first on the beam 3 of the road bridge 2 when the floor slab 1 is constructed is “first PCa member 11”, which is laid later. The PCa member 12 will be referred to as a “second PCa member 12” for convenience of explanation.

FIG. 2 is a cross-sectional view showing the structure of the joint portion between the two PCa members 11 and 12.
The first PCa member 11 and the second PCa member 12 are pretensioned PCa members in which prestressing by a pretension method is introduced in the road width direction using PC steel materials 13 and 14, respectively. The joint end faces 111 and 121 of the first PCa member 11 and the second PCa member 12 are provided with a concave portion 111a and a convex portion 121a for joining. In this example, a concave portion 111a is provided on the joint end surface 111 (first joint end surface) of the first PCa member 11, and a convex portion is provided on the joint end surface 121 (second joint end surface) of the second PCa member 12. 121a is provided.

  Further, the joint end surfaces 111 and 121 when the first PCa member 11 and the second PCa member 12 are laid on the joint end surfaces 111 and 121 of the first PCa member 11 and the second PCa member 12. For example, a joining key (mesky) made of metal, reinforced plastic, or the like is provided for easily joining together.

FIG. 3 is a cross-sectional view showing the configuration of the joining key.
The joining key 40 includes a first meskey 41 and a second meskey 42 provided on the joining end surfaces 111 and 121 of the PCa members 11 and 12 that are integrated with each other, It is comprised with the male key 43 inserted in the keyholes 41a and 42a of each 2 mesky. Semi-conical insertion portions 43a and 43b whose outer diameters are narrowed toward the tip are formed at both end portions of the oskey 43, and each insertion portion 43a and 43b is connected to the key hole 41a of the first Meskey 41 and the first one. By being inserted into the key hole 42a of the second mesky 42, the first meskies 41, 42 and the male key 43 are coaxially combined and integrated.

In FIG. 3, the first PCa member 11 on the left side is laid first, and then the second PCa member 12 on the right side is placed so that the joint end surface 121 abuts the joint end surface 111 of the first PCa member 11. In order to arrange, first, one insertion portion 43a of the male key 43 is inserted into the key hole 41a of the first female key 41 embedded in the first PCa member 11. At this time, the other insertion portion 43 b of the male key 43 protrudes from the joint end surface 111 of the first PCa member 11. Next, the second PCa member 12 on the right side in the figure is arranged. At this time, while adjusting the position so that the insertion portion 43b of the male key 43 protruding from the joint end surface 111 of the first PCa member 11 is inserted into the key hole 42a of the Mesky 42 embedded in the second PCa member 12, The joining end surface 121 of the second PCa member 12 is joined to the joining end surface 111 of the first PCa member 11.
Lay down.

  As shown in FIG. 2, sheaths 16 and 17 into which a PC steel material 15 for post tension is inserted are embedded in the first PCa member 11 and the second PCa member 12. In this example, the pre-stress introduced by tensioning the PC steel material 15 for post tension inserted into the sheaths 16 and 17 of the first PCa member 11 and the second PCa member 12 in the road width direction. The joining end surface 111 of the first PCa member 11 and the joining end surface 121 of the second PCa member 12 are in a pressure contact state, and the first PCa member 11 and the second PCa member 12 are integrated. That is, the PCa members 11 and 12 of this example assume that the pretension PC steel materials 13 and 14 are disposed in a direction orthogonal to the joint end surfaces 111 and 121 of the PCa members 11 and 12. Yes.

A minute gap between the joining end surfaces 111 and 121 of the first PCa member 11 and the second PCa member 12 is filled with a filler such as an epoxy resin adhesive.
The gap between the sheaths 16 and 17 and the surface of the PC steel material 15 for post tension is filled with grout.

Next, further detailed configurations of the first PCa member 11 and the second PCa member 12 will be described.
4 is a top view of the first PCa member 11 and the second PCa member 12 joined together, FIG. 5A is a cross-sectional view taken along the line AA ′ of the first PCa member 11 of FIG. 4, and FIG. It is BB 'sectional drawing of the 2nd PCa member 12. FIG.

  The first PCa member 11 is one in which pretension is introduced by a plurality of, for example, twelve first PC steel members 13. In addition, a plurality of, for example, four sheaths 16 for inserting the PC steel material 15 for post tension are embedded in the first PCa member 11. In the portion of the joining end surface 111 of the first PCa member 11, the first female key 41 is disposed at two locations separated from each other in the bridge axis direction.

  Similar to the first PCa member 11, the second PCa member 12 is one in which pretension is introduced by a plurality of, for example, twelve second PC steel members 14. Similarly to the first PCa member 11, a plurality of, for example, four sheaths 17 for inserting the PC steel material 15 for post tension are embedded in the second PCa member 12. In the portion of the joining end surface 121 of the second PCa member 12, the above-described Meskey 42 is disposed at two locations separated from each other in the bridge axis direction.

  In addition, the 1st meskys 41 and 42 may be arrange | positioned not only in two places mutually spaced apart in the bridge axis direction but in three or more places.

  In the first PCa member 11, the first PC steel material 13 and the sheath 16 are arranged in parallel with each other, and in the second PCa member 12, the second PC steel material 14 and the sheath 17 are arranged in parallel with each other. The first PC steel material 13 of the first PCa member 11 and the second PC steel material 14 of the second PCa member 12 are arranged at the same position in a plane orthogonal to the road width direction. The sheath 16 of the first PCa member 11 and the sheath 16 of the second PCa member 12 are also arranged at the same position in a plane orthogonal to the road width direction.

[2. PCa member manufacturing method]
Next, a method for manufacturing the first PCa member 11 and the second PCa member 12 will be described.

  In manufacturing the first PCa member 11 and the second PCa member 12 described above, the central axis (the central axis of the key hole 41a) of the first female key 41 provided in the first PCa member 11, and the second If the central axis (the central axis of the key hole 42a) of the second mesky 42 provided on the PCa member 12 is not aligned, the joint end surfaces 111, 121 of the first PCa member 11 and the second PCa member 12 are in contact with each other. It becomes difficult to join. For example, as shown in FIG. 6A, if there is a deviation between the central axis K1 of the first mesky 41 and the central axis K2 of the second mesky 42 of the set of two keys. The male key 43 projected from the joining end surface 111 of the existing first PCa member 11 cannot be inserted into the key hole 42a opened in the joining end surface 121 of the second PCa member 12, and the joining operation becomes difficult. Further, as shown in FIG. 6B, when the first mesky 41 and the second mesky 42 are embedded while being inclined with respect to the bridge axis direction, there is a possibility that the joining may be impossible.

In the present embodiment, when the joining end surfaces 111 and 121 of the respective PCa members 11 and 12 are formed using different molds, the central axis of the first female key 41 (the central axis of the key hole 41a) and the second The meskeys 41 and 42 attached to the respective molds are directly connected to each other using the connecting tool 80 so that the center axis (the center axis of the key hole 42a) of the meskey 42 is aligned in a straight line.
The form forming the joining end face 111 of the PCa member 11 is hereinafter referred to as a “first joining end form mold”, and the form forming the joining end face 121 of the PCa member 12 is hereinafter referred to as “second joining end form mold”. "

FIG. 7 is a top view showing the PCa member manufacturing environment in the factory.
A first PC steel member 13 for introducing prestress into the first PCa member 11 and a second member for introducing prestress into the second PCa member 12 between the abutments 31 installed at both ends of the production table 30. The PC steel material 44 to be the PC steel material 14 is stretched and tensioned. In FIG. 7, matters unnecessary for the description of the method of manufacturing the PCa member, such as the number and positions of the PC steel materials 44, are shown in a simplified manner. Further, the sheaths 16 and 17 for passing the post-tension PC steel material 15 are omitted.

  Next, rebars (not shown) for the first PCa member 11 and the second PCa member 12 are assembled on the production table 30, and the mold 50 and the second for the first PCa member 11 are assembled. The formwork 60 for the PCa member 12 is assembled.

The assembly of the mold 50 for the first PCa member 11 and the mold 60 for the second PCa member 12 is performed as follows, for example.
8 is an enlarged top view of portions of the mold 50 and the mold 60 in FIG. 7, FIG. 9 is a side view of FIG. 8, and FIG. 10 is a first joining end face mold in the mold 50 and the mold 60 in FIG. It is a side view which expands and shows the frame 52 and the 2nd joining end surface formwork 62. FIG.
In these drawings, the PC steel material 44 extending through the first joint end face mold 52 and the second joint end face mold 62 is omitted.

  First, the first joining end face mold 52 and the second joining end face mold 62 are placed on the mold bottom plate 51 placed on the production table 30 by using a fastener 70 such as a bolt (see FIG. 10). Each is fixed. Further, the upper portions of the first joining end face mold 52 and the second joining end face mold 62 are connected to each other by a plurality of caps 46 (see FIGS. 8 and 9). The first joining end face mold 52 and the second joining end face mold 62 are arranged at a predetermined distance in the extending direction of the PC steel material 44.

  After the first joint end face formwork 52 and the second joint end face formwork 62 are fixed, the first female key 41 is attached to the first joint end face formwork 52 and the second joint end face formwork 62 is attached to the second joint end face formwork 62. The second female key 42 is attached, and the individual female keys 41 and 42 are connected to each other by a connecting tool 80. Next, the side molds 53 and 63 that form side surfaces other than the joining end surface 111 of the first PCa member 11 and the joining end surface 121 of the second PCa member 12 are fixed, and the mold 50 for the first PCa member 11 is fixed. And the formwork 60 for the second PCa member 12 is completed.

Next, concrete is poured into the molds 50 and 60, and after the curing period, a predetermined strength of the concrete is developed. Then, the cap 46, the connecting tool 80, and the molds 50 and 60 are removed, and the tension of the PC steel material 44 is released. Then, prestress is introduced into each concrete.
Thereafter, unnecessary PC steel material 44 is cut and removed from the concrete. Thereby, the first PCa member 11 and the second PCa member 12 are completed.

[3. Configuration of connector 80]
Next, the structure of the connection tool 80 and a method of connecting the female keys 41 and 42 using the connection tool 80 will be described.
FIG. 11 is a cross-sectional view showing the overall configuration of the connector 80.
As shown in the figure, the connector 80 includes a first positioning pin 81, a second positioning pin 82, a center bolt 83, and a direction confirmation coupler 84.

(First positioning pin 81)
12A, 12B, and 12C are cross-sectional views showing a configuration and a connecting method of the first female key 41 and the first positioning pin 81 that are attached to the first joining end face formwork 52 for embedding in the first PCa member 11. It is.

  As shown in these drawings, the first positioning pin 81 can be inserted into the key hole 41a of the first Meskey 41 attached to the first joining end face formwork 52 to be embedded in the first PCa member 11. A first pin insertion portion 81a is provided at one end. A bolt hole 81b is provided along the central axis C1 of the first positioning pin 81 on the distal end surface of the pin insertion portion 81a.

  On the other hand, a bolt insertion hole 41b is also provided through the first mesky 41 along the central axis K1 of the key hole 41a from the opposite end face 41c of the first joining end face mold 52 to the key hole 41a. (See FIG. 12B). When the first pin insertion portion 81a of the first positioning pin 81 is inserted into the key hole 41a of the first female key 41, the central axis C1 of the first positioning pin 81 and the key of the first female key 41 The central axis K1 of the hole 41a is aligned. From this state, the first positioning pin inserted into the bolt hole 41b of the first mesky 41 from the end face 41c side of the first mesky 41 into the bolt insertion hole 41b, for example, is inserted into the key hole 41a of the first mesky 41. It is screwed into a bolt hole 81b provided in the first pin insertion portion 81a of 81 (see FIG. 12C). The amount of insertion of the bolt 47 into the bolt hole 81b is regulated by the nut 47a. Finally, the bolt 47 is fastened using the washer 47b and the nut 47c. As a result, the first pin insertion portion 81a of the first positioning pin 81 is coaxially fixed in the key hole 41a of the first mesky 41.

  The first joining end face mold 52 is provided with a pin insertion hole 52a into which the first pin insertion portion 81a of the first positioning pin 81 can be inserted. When the first positioning pin 81 is connected to the first female key 41 by the bolt 47, the first pin insertion portion 81a of the first positioning pin 81 is connected to the pin insertion hole 52a of the first joining end face mold 52. Insert into. The first positioning pin 81 is coaxially provided with an enlarged diameter portion 81c that is slightly larger in outer diameter than the first pin insertion portion 81a adjacent to the first pin insertion portion 81a. When the first pin insertion portion 81a is inserted into the pin insertion hole 52a of the first joint end face mold 52 from the outside, the first joint insertion face mold 52 is expanded to the outer wall surface 52b around the pin insertion hole 52a. The side surface of the diameter part 81c contacts. As a result, the enlarged diameter portion 81c serves as a stopper, and the insertion position of the first pin insertion portion 81a of the first positioning pin 81 is restricted. On the other hand, the end surface on the first joint end surface mold 52 side of the first Meskey 41 comes into contact with the inner wall surface 52 c around the pin insertion hole 52 a of the first joint end surface mold 52. As a result, the first female key 41 is attached to a predetermined position of the first joining end face formwork 52.

  In the first positioning pin 81, a coupler holding portion 81e having a thread groove 81d on the outer peripheral surface is provided on the side away from the first pin insertion portion 81a with the diameter-enlarged portion 81c interposed therebetween. A direction confirmation coupler 84 is slidably held in the direction of the center axis C1 of the first positioning pin 81 on the outer periphery of the coupler holding portion 81e. A screw groove 84a that is screwed into a screw groove 81d provided on the outer periphery of the coupler holding portion 81e is provided on the inner peripheral surface of the predetermined range in the axial direction of the direction confirmation coupler 84. Thereby, the direction confirmation coupler 84 is slid in the direction along the central axis C <b> 1 of the first positioning pin 81 by rotating the direction confirmation coupler 84 held by the coupler holding portion 81 e in the direction around the axis.

  A concave portion 81f capable of holding one end portion (convex portion 83b) of the center bolt 83 is provided at the end of the coupler holding portion 81e of the first positioning pin 81 on the opposite side of the first pin insertion portion 81a. . The concave portion 81 f corresponds to an “engagement portion” in the claims of the present invention, and engages with one end portion (convex portion 83 b) of the center bolt 83, so that the first positioning pin 81 of the first positioning pin 81 is engaged. The center axis is provided in a shape that allows the center axis of the center bolt 83 and the second positioning pin 82 to coincide with each other. One end portion (convex portion 83b) of the center bolt 83 corresponds to an “axial centering portion” in the claims of the present invention.

(Second positioning pin 82)
FIGS. 13A and 13B are cross-sectional views showing the configuration and connection method of the second mesquies 42 and the first positioning pins 82 attached to the second joining end face formwork 62 for embedding in the second PCa member 12. .

  As shown in these drawings, like the first positioning pin 81, the second positioning pin 82 is a female key attached to the second joining end face mold 62 for embedding in the second PCa member 12. A second pin insertion portion 82a that can be inserted into the key hole 42a of the 42 is provided at one end. A bolt hole 82b is provided along the central axis C2 of the second positioning pin 82 at the distal end surface of the second pin insertion portion 82a.

  On the other hand, the second mesky 42 is also provided with a bolt insertion hole 42b extending from the opposite end face 42c of the second joining end face mold 62 to the key hole 42a along the central axis K2 of the key hole 42a. Yes. When the second pin insertion portion 82a of the second positioning pin 82 is inserted into the key hole 42a of the second positioning key 82, the center axis C2 of the second positioning pin 82 and the key of the second positioning key 82 The center axis K2 of the hole 42a is aligned. From this state, a bolt 48 such as a full screw bolt is inserted into the bolt insertion hole 42b from the end face 42c side of the second mesky 42, and the second positioning pin fitted in the key hole 42a of the second mesky 42 is inserted. 82 is screwed into a bolt hole 82b provided in the second pin insertion portion 82a. The amount of insertion of the bolt 48 into the bolt hole 82b is regulated by the nut 48a. Finally, the bolt 48 is fastened using the washer 48b and the nut 48c. Accordingly, the second pin insertion portion 82a of the second positioning pin 82 is coaxially fixed in the key hole 42a of the second mesky 42.

  Similarly to the first joint end face mold 52, the second joint end face mold 62 can be inserted with a second pin insertion portion 82 a of the second positioning pin 82. 62a is provided. When the second positioning pin 82 is connected to the second mesky 42 by the bolt 48, the second pin insertion portion 82 a of the second positioning pin 82 is connected to the pin insertion hole 62 a of the second joining end face mold 62. Insert into. The second positioning pin 82 is coaxially provided with an enlarged diameter portion 82c adjacent to the pin insertion portion 82a and having a slightly larger outer diameter than the pin insertion portion 82a. When the pin insertion portion 82a is inserted into the pin insertion hole 62a of the second joint end face mold 62 from the outside, the diameter-expanded portion 82c is formed on the outer wall surface 62b around the pin insertion hole 62a of the second joint end face mold 62. The sides of the abut. As a result, the enlarged diameter portion 82c serves as a stopper, and the insertion position of the second pin insertion portion 82a of the second positioning pin 82 is restricted. On the other hand, the end surface on the second joining end surface mold 62 side of the second mesky 42 abuts on the inner wall surface 62 c around the pin insertion hole 62 a of the second joining end surface mold 62. Thereby, the second mesky 42 is attached to a predetermined position of the second joining end face formwork 62.

  In the second positioning pin 82, a part of the center bolt 83 extends along the direction of the central axis C <b> 2 of the second positioning pin 82 on the side away from the second pin insertion portion 82 a of the enlarged diameter portion 82 c. A center bolt hole 82d inserted in this manner is provided coaxially with respect to the second positioning pin 82. The center bolt hole 82d opens in the tip surface 82f of the enlarged diameter portion 82c. A screw groove 82e that is screwed into a screw groove 83a provided in the outer peripheral surface of the center bolt 83 is provided on the inner peripheral surface of the center bolt hole 82d in the direction of the center axis C2 of the second positioning pin 82. It is done. The center bolt 83 partially inserted into the center bolt hole 82d of the enlarged diameter portion 82c of the second positioning pin 82 is rotated in the direction around the axis, whereby the enlarged diameter portion 82c of the second positioning pin 82 is rotated. The amount of projection of the center bolt 83 from the front end face 82f can be varied.

(Center bolt 83)
The center bolt 83 is configured so that the other end portions of the first positioning pin 81 and the second positioning pin 82, each of which has one end connected to the first mesky 41 and the second mesky 42, are centered on each other. It is a member for engaging the shafts C1 and C2 so that they are aligned. The tip of the center bolt 83 protruding from the center bolt hole 82d of the enlarged diameter portion 82c of the second positioning pin 82 has a recess 81f provided at the tip of the coupler holding portion 81e of the first positioning pin 81. A convex portion 83b (axial centering portion) that fits in the axial direction is provided on the (engaging portion). The concave portion 81f and the convex portion 83b are formed in a shape that can be fitted to each other so that the central axis C1 of the first positioning pin 81 and the central axis C2 of the second positioning pin 82 are aligned, for example, a semi-conical shape. Is done.

  Further, a header 83c is provided at a predetermined position in the vicinity of the convex portion 83b of the center bolt 83 so that the center bolt 83 can be rotated around the axis by using a tool or the like.

(Direction confirmation coupler 84)
Next, the direction confirmation coupler 84 will be described.
As described above, the first positioning pin 81 and the second positioning pin 82 are engaged via the center bolt 83 so that the central axes C1 and C2 are aligned with each other. Since only the concave portion 81f and the convex portion 83b of the lead pin 81 and the center bolt 83 are fitted in the axial direction, the direction confirmation coupler 84 is used to fix this state.

  The direction confirmation coupler 84 is movable only in the direction of the central axis C1 of the first positioning pin 81 while maintaining a coaxial relationship with the first positioning pin 81 on the outer periphery of the first positioning pin 81. By holding a part of the outer peripheral surface of the first positioning pin 81 and a part of the outer peripheral surface of the second positioning pin 82 on the inner peripheral surface of both end portions in the direction of the central axis C1, the first positioning pin 82 is held. The positioning pin 81 and the second positioning pin 82 are members for fixing a state in which the center axes C1 and C2 are aligned with each other via the center bolt 83 and are engaged with each other.

  14A, 14B, and 14C show a connecting tool 80 that connects the first meskey 41 attached to the first joining end face formwork 52 and the second meskey 42 attached to the second joining end face formwork 62. It is sectional drawing which shows the procedure connected using.

  FIG. 14A shows that the first pin insertion portion 81a of the first positioning pin 81 is connected to the key hole 41a of the first female key 41 attached to the first joint end face mold 52, and the second joint end face type is shown. It is a figure which shows the state by which the pin insertion part 82a of the 2nd positioning pin 82 was connected with the key hole 42a of the 2nd mesky 42 attached to the frame 62. FIG. At this time, it is desirable that the direction confirmation coupler 84 is held at the position from the first pin insertion portion 81a in the slide range of the coupler holding portion 81e of the first positioning pin 81. When the direction confirmation coupler 84 is in this position, the end face of the direction confirmation coupler 84 is retracted from the front end face of the coupler holding portion 81e provided with the recess 81f, and the second positioning pin 82 is connected to the second joint. It is possible to avoid the direction confirmation coupler 84 from interfering with the second mesky 42 attached to the end face formwork 62.

  When the first positioning pin 81 is connected before the second positioning pin 82, the second positioning pin 82 is the second in a state where the center bolt 83 is held in the center bolt hole 82d. It is connected to the key hole 42a of the mesky 42. At this time, the projecting amount of the center bolt 83 from the tip surface 82f of the enlarged diameter portion 82c of the second positioning pin 82 needs to be managed so that the center bolt 83 and the first positioning pin 81 do not interfere with each other. There is.

  In this way, the first pin insertion portion 81a of the first positioning pin 81 is connected to the key hole 41a of the first female key 41 attached to the first joint end face mold 52, and the second joint end face mold After the second pin insertion portion 82a of the second positioning pin 82 is connected to the key hole 42a of the second female key 42 attached to the 62, the operator can set the center bolt 83 as shown in FIG. 14B. , And the protrusion 83b at the tip of the center bolt 83 is inserted into the recess 81f provided at the tip of the coupler holding portion 81e of the first positioning pin 81 from the axial direction. Fit.

  Next, as shown in FIG. 14C, the direction confirmation coupler 84 is rotated in the direction around the axis at the coupler holding portion 81e of the first positioning pin 81, and the inner peripheral surfaces of both end portions of the direction confirmation coupler 84 are first. The positioning pin 81 is moved to a position where a part of the outer peripheral surface of the positioning pin 81 and a part of the outer peripheral surface of the second positioning pin 82 can be held. As a result, the central axis C1 of the key hole 41a of the first meskey 41 attached to the first joining end face formwork 52, and the central axis K1 of the first positioning pin 81 connected to the first meskey 41 The central axis C2 of the key hole 42a of the second mesky 42 attached to the second joining end face formwork 62 and the central axis K2 of the second positioning pin 82 connected to the second mesky 42 are all straight. The state of being aligned on the line is fixed.

  As shown in FIG. 15, the direction confirmation coupler 84 may have a polygonal cylindrical cross-sectional shape such as a regular hexagon so that an operator can grasp and turn it by hand.

  When the molds 50 and 60 are disassembled, the direction confirmation coupler 84 is returned to the original position from the first pin insertion portion 81 a of the first positioning pin 81, and the center bolt 83 is returned to the second positioning pin 82. Return to the original holding position in the center bolt hole 82d. Thereafter, the first positioning pin 81 is rotated in the direction about the axis in a direction in which the screw 47 protruding into the key hole 41a of the first mesky 41 and the bolt hole 81b of the first pin insertion portion 81a are released. The first positioning pin 81 can be extracted from the key hole 41 a of the first mesky 41 by rotating the first positioning pin 81. Similarly, the second positioning pin 82 has a second position in the direction in which the bolt 48 protruding into the key hole 42a of the second mesky 42 and the bolt hole 82b of the second pin insertion portion 82a are released. The second positioning pin 81 can be extracted from the key hole 42a of the second female key 42 by rotating the protruding pin 81 around the axis.

  The bolt 47 remaining on the first mesky 41 can be pulled out to the outside through the bolt insertion hole 42b by pulling it strongly using a tool and breaking or deforming the washer 47b. Similarly, the bolt 48 remaining on the second mesky 42 can be pulled out by pulling it strongly with a tool.

[4. Regarding the effects of this embodiment]
As described above, according to the PCa member manufacturing method of the present embodiment, the first PC steel materials 13 and 14 for pretension are orthogonal to the joint end surfaces 111 and 121 of the PCa members 11 and 12. The PCa member having the disposed structure can be manufactured. Further, in the present embodiment, the case where a pair of the first PCa member 11 and the second PCa member 12 are manufactured at the same time has been described. However, the first PCa member 11 and the second PCa are manufactured in one manufacturing base 30. A plurality of sets of members 12 can be manufactured.

  Further, since the first PCa member 11 and the second PCa member 12 can be manufactured by a single concrete placement, the manufacturing period can be shortened and the cost can be reduced as compared with the method of manufacturing each PCa member separately. Can be achieved.

  In the case of the method of manufacturing the first PCa member 11 and the second PCa member 12 in separate steps, it occurs in each concrete due to differences in construction environment conditions such as temperature and humidity in each manufacturing step. Due to differences in strain stress and torsional stress, displacement and inclination may occur between the joint end faces. If there is a deviation or inclination between the joint end faces, the first PCa member 11 and the second PCa member 12 can be well integrated by introducing post tension in the direction in which the joint end faces are brought into contact with each other. It becomes difficult. In the present embodiment, by manufacturing the first PCa member 11 and the second PCa member 12 by a single concrete placement, the above-described problems due to differences in construction environment conditions can be solved.

  A first Meskey 41 attached to the first joint end face formwork 52 for embedding in the first PCa member 11 and a second attached to the second joint end face formwork 62 for embedding in the second PCa member 12. The central axis K1 of the key hole 41a of the first mesky 41 and the central axis K2 of the key hole 42a of the second mesky 42 can be aligned with each other by connecting the second mesky with the connecting tool 80. 6A and 6B, the displacement between the central axis K1 of the key hole 41a of the first mesky 41 and the central axis K2 of the key hole 42a of the second mesky 42 results in the installation site. The difficulty in joining the first PCa member 11 and the second PCa member 12 can be avoided, and the construction period can be shortened.

  Moreover, according to the connector 80 of this embodiment, the 1st pin insertion part 81a of the 1st positioning pin 81 is attached to the 1st joining end surface formwork 52, The key hole 41a of the 1st mesky 41 Therefore, the first positioning pin 81 can manage the direction of the central axis K1 of the key hole 41a of the first mesky 41. Similarly, since the second pin insertion portion 82a of the second positioning pin 82 is inserted into and connected to the key hole 42a of the second female key 42 attached to the second joining end face formwork 62, The direction of the central axis K2 of the key hole 42a of the second mesky 42 can be managed by the second positioning pin. The concave portion 81f at the end of the first positioning pin 81 and the convex portion 83b at the tip of the center bolt 83 held by the second positioning pin 82 so as to be able to advance and retreat in the axial direction are axial. The position of the central axis C1 of the first positioning pin 81 and the position of the central axis C2 of the second positioning pin 82 can be matched at this engagement point. In this state, the direction confirmation coupler 84 holds a part of the outer periphery of the first positioning pin 81 and a part of the outer periphery of the second positioning pin 82, whereby the first positioning pin 81 and the second positioning pin 81. The centering axes C1 and C2 of the positioning pin 82 can be fixed in a straight line. Therefore, by using this connector 80, each of the central axis K1 of the key hole 41a of the first mesky 41 and the central axis K2 of the key hole 42a of the second mesky 42 is surely aligned with each other. Meskys 41 and 42 can be connected to each other.

  As mentioned above, although the manufacturing method of the PCa member which comprises the PCaPC floor slab 1 laid in a bridge was described, this invention is applicable also as a manufacturing method of the PCa member which comprises the PCaPC floor slab of a building.

DESCRIPTION OF SYMBOLS 1 ... PCaPC floor slab 11 ... 1st PCa member 12 ... 2nd PCa member 13 ... 1st PC steel material 14 ... 2nd PC steel material 15 ... PC steel material for post tension 30 ... Production stand 31 ... Abut 41 ... First Meskey 41a ... Keyhole 42 of the first Meskey 42 ... Second Meskey 42a ... Key hole of the second Meskey 52 ... First joint end face formwork 62 ... Second joint end face formwork 80 ... Connector 81 ... first positioning pin 81a ... first pin insertion portion 81f ... concave 82 ... second positioning pin 82a ... second pin insertion portion 82d ... center bolt hole 83 ... center bolt 83b ... convex portion 84 ... Direction confirmation coupler

Claims (2)

A method for producing a first concrete member having a first joint end face and a second concrete member having a second joint end face connectable to the first joint end face,
Tensioning the PC steel material between the abutments on both ends of the production table,
A mold for the first concrete member, including a first joint end face form that forms the first joint end face on the production table, the first joint end face being spaced apart from each other by a predetermined distance in the extending direction of the PC steel material. Assembling a rebar and a formwork and rebar for the second concrete member including a second joint end face formwork forming the second joint end face;
A mesque for joining the first joint end face and the second joint end face is attached to the first joint end face mold and the second joint end face mold, and each corresponding keyhole of the meskey The corresponding mesquees are connected to each other so that the center axes of the keyholes of the corresponding mesques are aligned with each other by a connecting tool in which both ends are inserted,
After the concrete is placed in each formwork and a predetermined strength is developed, the connection by the connector is released, the tension of the PC steel material is released, and the prestress is introduced into the concrete. Production method. Prestress is introduced using each of the PC steel materials to produce a first concrete member having a first joint end face and a second concrete member having a second joint end face that can be joined to the first joint end face. And a central axis of a key hole of a first Meskey for joining attached to a first joining end face formwork that forms the first joining end face to be embedded in the first concrete member. The center axes of the key holes of the second Meskey for joining attached to the second joining end face formwork forming the second joining end face for embedding in the second concrete member are aligned with each other. A connecting key connecting tool for connecting the corresponding mesquities to each other,
A first positioning pin having a first pin insertion portion inserted into the key hole of the first mesky and connected to the first mesky at one end and an engagement portion at the other end;
The second pin insertion portion that is inserted into the key hole of the second mesky and can be connected to the second mesky is provided at one end, and the engagement portion of the first positioning pin is provided at the other end. A second positioning pin that holds a center bolt having an axial alignment portion for engaging and aligning the axial center with the first positioning pin;
A direction confirmation coupler externally fitted to the first positioning pin so as to be movable along the axial direction of the first positioning pin;
The shaft center of the center bolt held by the second positioning pin connected to the second mesky at the engaging portion of the first positioning pin connected to the first mesky. An alignment portion is engaged to align the axes of the first positioning pin and the second positioning pin, and the direction confirmation coupler is moved to move a part of the outer periphery of the first positioning pin and the first positioning pin. By holding a part of the outer periphery of the positioning pin 2 on the inner peripheral surface of the direction confirmation coupler, the central axis of the key hole of the first mesky and the central axis of the key hole of the second mesky Joining key connector configured to align

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