JP4607801B2 - Manufacturing method of bi-directional pretension member - Google Patents

Description

  The present invention relates to a method of simultaneously manufacturing a plurality of bi-directional pretension members in series.

  In the bi-directional pretension member, a plurality of longitudinal PC steel materials extending in the longitudinal direction and a plurality of transverse PC steel materials extending in the transverse direction so as to intersect the longitudinal PC steel materials are arranged in the concrete member. It has been configured.

  FIG. 4 of “Patent Document 1” describes a method of simultaneously manufacturing a plurality of such two-way pretension members at a plurality of locations in the vertical direction.

  That is, in the manufacturing method described in FIG. 4 of “Patent Document 1”, the placement positions of the plurality of concrete members are arranged in series in the vertical direction, and the ground around the placement positions of the plurality of places is arranged. In a state where a plurality of reaction force devices are installed, a plurality of transverse PC steel materials are fixed to the reaction force devices located on both lateral sides of each placement position, and tension and release of these transverse PC steel materials using a jack By introducing a pre-stress in the transverse direction for each concrete member, and fixing a plurality of longitudinal PC steel materials to reaction force devices located at both longitudinal ends of the placement positions of a plurality of places, By using a jack to tension and release the longitudinal PC steel, longitudinal prestress is introduced into a plurality of concrete members.

JP 2005-47233 A

  In the manufacturing method described in the above-mentioned “Patent Document 1”, the tension and the release of tension of each lateral PC steel material are collectively performed for each concrete member. When the tension of the PC steel material in the transverse direction is released only for some of the concrete members, the concrete member that has been released is displaced in the lateral direction, whereas the concrete member that has not been released is displaced. Therefore, the longitudinal PC steel material positioned between these two concrete members is deformed in an oblique direction with respect to the longitudinal direction. For this reason, the concrete member has a problem that the peripheral region of the longitudinal PC steel material at the longitudinal end portion thereof is damaged, and the desired quality cannot be ensured as the two-way pretension member. . Moreover, when doing in this way, there also exists a problem that there exists a possibility that a worker may be dangerous by the displacement of the concrete member accompanying tension release.

  In order to avoid the occurrence of such a problem, it is necessary to simultaneously and gradually release the tension of the transverse PC steel material to a plurality of concrete members. In this case, the work efficiency is very high. There is a problem that it becomes bad.

  The present invention has been made in view of such circumstances. In the case where a plurality of two-way pretension members are simultaneously manufactured in series, the work quality is maintained and the desired quality and work are maintained. It is an object of the present invention to provide a method for manufacturing a bi-directional pretensioning member that can ensure safety.

  The present invention is intended to achieve the above object by introducing a prestress in the lateral direction using a predetermined auxiliary PC steel material.

That is, the manufacturing method of the bidirectional pretension member according to the present invention is as follows:
Bidirectional pretension in which a plurality of longitudinal PC steel materials extending in the longitudinal direction and a plurality of transverse PC steel materials extending in the transverse direction so as to intersect the longitudinal PC steel materials are disposed in the concrete member. In the method of simultaneously manufacturing a plurality of members at a plurality of locations in the vertical direction,
Using a production bed in which the horizontal vertical cross-sectional shape is set to a substantially U-shape,
With one end of each lateral PC steel material fixed on one side wall of the production bed, the lateral PC steel material is tensioned and released using a jack installed on the other side wall of the production bed. By introducing lateral prestress into each concrete member placed between the both side walls,
At that time, in each of the plurality of locations, a plurality of auxiliary PC steel materials are disposed so as to penetrate the side wall in a lateral direction with respect to the one side wall, and pre-stress is applied to each of the auxiliary PC steel materials in advance. Introducing and fixing one end portion of the plurality of transverse PC steel materials to the one side wall, the end portion of the plurality of transverse PC steel materials and the side walls of the plurality of auxiliary PC steel materials This is performed by connecting the protruding portion from the side surface.

  The “production bed” is not particularly limited as long as the vertical cross-sectional shape in the horizontal direction is set to be substantially U-shaped.

  The specific connecting method of the “plural transverse PC steel materials” and the “plural auxiliary PC steel materials” in each of the plurality of locations is not particularly limited. The “PC steel material” and each “auxiliary PC steel material” may be connected in a one-to-one relationship, or this may not be the case.

  The pre-stress introduced in advance to each of the “auxiliary PC steel materials” may be pre-tension or post-tension.

  The specific value of the prestress introduced into each “auxiliary PC steel” is not particularly limited as long as it is equal to or greater than the prestress introduced into each lateral PC steel. However, to increase the durability of each auxiliary PC steel against repeated tension and release of tension in each lateral PC steel can be set to a value that is somewhat larger than the prestress introduced into each lateral PC steel. preferable.

  As shown in the above configuration, the method for manufacturing a bi-directional pretension member according to the present invention is a bi-directional pretension in which a plurality of longitudinal PC steel members and a plurality of transverse PC steel members are arranged in a concrete member. A plurality of members are manufactured at a plurality of locations in the vertical direction at the same time. At this time, a manufacturing bed in which the vertical cross-sectional shape in the horizontal direction is set to a substantially U-shape is used, and one side wall of the manufacturing bed is used. In the state where one end of each lateral PC steel material is fixed to each other, each lateral PC steel material is placed between both side walls by tensioning and releasing the tension using a jack installed on the other side wall. Since prestressing in the transverse direction is introduced into the concrete member, it is possible to introduce the prestressing in the transverse direction with an inexpensive manufacturing facility, and the tension of the transverse PC steel material. Administration is facilitated and becomes thereby possible to easily perform the desired prestress introduced.

  Moreover, in the present invention, at each of the plurality of locations, a plurality of auxiliary PC steel materials are disposed so as to penetrate the side wall in a lateral direction with respect to one side wall, and each of the auxiliary PC steel materials is preliminarily placed on the auxiliary PC steel materials. Stress is introduced, and fixing of one end of a plurality of transverse PC steel materials to the one side wall is performed by fixing one end of the plurality of transverse PC steel materials and the side walls of the plurality of auxiliary PC steel materials. Since it carries out by connecting with the protrusion part from the inner surface of this, the following effects can be obtained.

  That is, if there is no auxiliary PC steel material, the fixing of one end of a plurality of transverse PC steel materials to the one side wall is performed by inserting a plurality of transverse PC steel materials into a plurality of insertion holes formed in the side wall. This is performed on the outer side surface of the side wall in a state where each of these is inserted. For this reason, the length of the portion from the side end surface of the concrete member to the fixing position in each of the lateral PC steel materials is considerably long, and this portion extends due to tension and contracts due to tension release. Therefore, the concrete member when the tension is released The displacement amount of is considerably large.

  On the other hand, as in the present invention, a plurality of auxiliary PC steel materials are arranged on the one side wall in a state in which prestress is introduced in advance, and the side walls at one end of the plurality of transverse PC steel materials are arranged. If fixing is performed by connecting one end portion of a plurality of transverse PC steel materials and a protruding portion from the inner side surface of the side wall of a plurality of auxiliary PC steel materials, Each lateral PC steel material is the total of the portion from the side end surface of the concrete member to the connection position with each auxiliary PC steel material and the protruding portion of each auxiliary PC steel material, and its length is reduced by the thickness of the side wall. Therefore, the displacement amount of the concrete member accompanying the tension release can be made sufficiently small.

  And thereby, it is possible to eliminate the risk of damaging the peripheral region of each longitudinal PC steel material at the longitudinal end of the concrete member, and it is possible to eliminate the risk of danger to the worker. Thereby, the tension release of the plurality of transverse PC steel materials with respect to each of the concrete members placed at the plurality of locations can be quickly performed in an arbitrary procedure between the locations.

  As described above, according to the present invention, when a plurality of two-way pretension members are manufactured in series at the same time, it is possible to ensure the desired quality and work safety while maintaining work efficiency.

  In the above configuration, if a plurality of transverse PC steel materials and a plurality of auxiliary PC steel materials are connected to each other by using a coupler for each of the transverse PC steel materials and each auxiliary PC steel material, the structure is simple. And both PC steel materials can be connected by simple work.

  In the above configuration, the prestress is introduced into each auxiliary PC steel material, and the fixing steel material is disposed on the inner side of the one side wall at a predetermined distance from the inner side surface of the side wall, and each auxiliary PC steel material protrudes from the fixing steel material. If the part is fixed, and a plurality of transverse PC steels and a plurality of auxiliary PC steels are connected by fixing each transverse PC steel to the fixing steel, Both PC steel materials can be connected with a simple operation. In addition, by adopting such a connection structure, the portion that shrinks when the tension is released can be only the portion from the side end surface of the concrete member in the transverse PC steel material to the fixing position to the fixing steel material, and its length Since the length can be further shortened by the predetermined interval, the amount of displacement of the concrete member accompanying the release of tension can be further reduced.

  In the above configuration, as the production bed, a double production bed in which the vertical cross-sectional shape in the lateral direction is set to a double U-shape is used, and two pairs of bi-directional pretension members are provided at a plurality of vertical locations. In this case, at each of the plurality of locations, a plurality of auxiliary PC steel materials are arranged so as to penetrate the central side wall laterally with respect to the central side wall located at the horizontal center of the production bed. In addition, prestress is previously introduced into each of the auxiliary PC steel materials, and the plurality of auxiliary PC steel materials are prestressed in the lateral direction with respect to each of the pair of concrete members disposed on both sides of the central side wall. If they are shared during the introduction, the production efficiency of the bi-directional pretension member can be increased, and the auxiliary PC steel material can be effectively used.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a view showing a production bed 10 used in a method for producing a bi-directional pretension member according to an embodiment of the present invention in a state in which a predetermined accessory device is mounted, and FIG. The top view and the same figure (b) are side sectional views.

  As shown in the figure, this production bed 10 is made of reinforced concrete and has an elongated rectangular outer shape in plan view, and its length in the longitudinal direction (long direction) is about 100 m. The horizontal length is set to a value of about 13 m. This production bed 10 is configured as a self-contained production bed, and is used in a state where it is installed on the flat ground 2. In the present embodiment, the ground 2 is soft ground, and the production bed 10 is installed so as to sink into the ground 2 by a predetermined amount (specifically, about 0.8 m).

  The production bed 10 has a bottom wall 10A, a pair of side walls 10B and 10C which rise upward at both lateral edges of the bottom wall 10A, and a vertical wall 1 which rises upward at both longitudinal edges of the bottom wall 10A. It consists of a pair of end walls 10D and 10E, and both vertical and horizontal vertical cross-sectional shapes thereof are set to be substantially U-shaped. At this time, the production bed 10 is configured as a box-shaped production bed in which both end walls 10D and 10E and both side walls 10B and 10C are continuously formed. A space is formed.

  The bi-directional pretension member 100 to be manufactured in the present embodiment includes 38 longitudinal PC steel members 102 extending in the longitudinal direction (19 pieces each in two upper and lower stages), and intersecting these longitudinal PC steel materials. Twenty-two horizontal PC steel members 104 extending in the horizontal direction are horizontally long concrete slabs arranged in the concrete member 106, and in 21 vertical positions in the working space of the production bed 10, 21 are manufactured at the same time.

  In the process of manufacturing the 21 bi-directional pretension members 100, lateral pre-stress and vertical pre-stress are introduced into each bi-directional pre-tension member 100. These two-way prestress introduction is performed as follows.

  In other words, with one end of each lateral PC steel material 104 fixed to one side wall 10B, each pair of jacks 50 installed on the other side wall 10C is used for tension of 22 lateral PC steel materials 104 and By releasing the tension, lateral prestress is introduced into each concrete member 106 placed between the side walls 10B and 10C.

  In addition, with one end wall 10D fixed to one end of each longitudinal PC steel material 102, 38 longitudinal PC steel materials are used by using a pair of jacks 30 installed on the other end wall 10E. By performing the tension 102 and releasing the tension, the vertical prestress is collectively introduced into the 21 concrete members 106 placed between the both end walls 10D and 10E. .

  2, 3, 4 and 5 are a detailed view of a portion II, a detailed view of a portion III, a detailed view of a portion IV and a detailed view of a portion V in FIG. 6 is a detailed sectional view taken along the line VI-VI in FIG.

  As shown in these drawings, the bottom wall 10A of the production bed 10 has a wall thickness set to a value of about 1.2 m, and the bottom surface of the bottom wall 10A is formed in a flat shape over the entire area. Has been.

  Each side wall 10B, 10C of the production bed 10 has a wall thickness set to a value of about 1.2 m, and its height is set to a value of about 2.2 m from the lower surface of the bottom wall 10A. ing. On the inner side surfaces of these side walls 10B and 10C, haunch portions 10Ba and 10Ca having an inclination angle of about 45 ° are formed at the lower end portions thereof.

  Further, the wall thickness of each end wall 10D, 10E of the production bed 10 is set to a value of about 2.2 m at the upper end surface of the end wall 10D, 10E, and the height is set to each side wall. The height is set to the same value as 10B and 10C. The inner side surfaces of the end walls 10D and 10E are formed as inclined surfaces 10Da and 10Ea having an inclination angle of about 45 °.

  At that time, one end wall 10D has 38 insertion holes (not shown) for inserting 38 longitudinal PC steel members 102 in a two-stage arrangement with a predetermined interval in the horizontal direction. It is formed so as to penetrate in the vertical direction.

  A pretension introduction device 20 is attached to the other end wall 10E. The pretension introduction device 20 includes a fixing block 22 disposed in the vicinity of the inner side of the end wall 10E, a receiving beam 24 disposed in the vicinity of the outer side of the end wall 10E, the fixing block 22, and the end wall. 10E and the receiving beam 24 are vertically arranged in two stages so as to vertically penetrate the fixing block 22 and the receiving beam 24, and two pairs of tension rods 26 fixed to the receiving beam 24 by nuts 28, and end portions The configuration includes a pair of jacks 30 installed between the wall 10 </ b> E and the receiving beam 24. At that time, the fixing block 22 has 38 insertion holes (not shown) for inserting the 38 longitudinal PC steel materials 102 in the vertical direction with a predetermined interval in the horizontal direction and arranged in two vertical stages. It is formed so as to penetrate through.

  FIG. 7 is a detailed view of a portion VII in FIG.

  As shown in the figure, the fixing of one end portion of each lateral PC steel material 104 to one side wall 10 </ b> B is performed via an auxiliary PC steel material 60.

  That is, 22 insertion holes (not shown) for inserting 22 auxiliary PC steel materials 60 are inserted into the side wall 10B at positions corresponding to the 21 locations in the vertical direction and the horizontal direction PC. The steel material 104 is formed so as to penetrate the side wall 10B in the lateral direction at the same interval as the arrangement interval of the steel materials 104. And in this side wall 10B, the 22 auxiliary PC steel materials 60 are arrange | positioned in the state which pre-stressed previously, while penetrating this side wall 10B to a horizontal direction. At this time, the pre-stress is introduced into each auxiliary PC steel material 60 by post tension, and the pre-stress is set to a value somewhat larger than the pre-stress introduced into each lateral PC steel material 104. ing.

  Fixing tools 62 for fixing each auxiliary PC steel material 60 are mounted on both side surfaces of the side wall 10B. Each of the auxiliary PC steel materials 60 is disposed such that the protruding portion 60a on the inner surface side of the side wall 10B protrudes somewhat from the fixing device 62 attached to the protruding portion 60a. It is connected to one end of each lateral PC steel material 104. This connection is performed using a coupler 64.

  As shown in FIGS. 2, 3 and 6, pre-tension introduction devices 40 are attached to the other side wall 10C at 21 locations at equal intervals in the vertical direction. The pretension introduction device 40 includes a fixing block 42 disposed near the inside of the side wall 10C, a receiving beam 44 disposed near the outside of the side wall 10C, and the fixing block 42, the side wall 10C, and the receiving beam 44. It was arranged so as to penetrate in the lateral direction, and both ends were installed between two pairs of tension rods 46 fixed to the fixing block 42 and the receiving beam 44 with nuts 48, and the side wall 10C and the receiving beam 44. The configuration includes a pair of jacks 50. At that time, each fixing block 42 has 22 insertion holes (not shown) through which the 22 horizontal PC steel materials 104 are inserted so as to penetrate in the horizontal direction at predetermined intervals in the vertical direction. Is formed.

  Next, the manufacturing process of the two-way pretension member 100 will be described.

  First, a formwork (not shown) corresponding to the shape of the concrete member 106 is installed at 21 locations in the vertically long work space in the production bed 10, and 38 vertical PC steel materials 102 are horizontally arranged in two steps. Are arranged at equal intervals, and at each location, the twenty-two horizontal PC steel materials 104 are arranged at equal intervals in the vertical direction in the vicinity of the upper portion of the vertical PC steel material 102 located in the upper stage.

  Each longitudinal PC steel material 102 is fixed by the fixing tool 32 on the outer surface of the end wall 10D in a state where one end thereof is inserted into an insertion hole formed in one end wall 10D, and the other end. In the state where the portion is inserted through the insertion hole formed in the fixing block 22, fixing is performed by the fixing tool 32 on the end surface on the outer side in the vertical direction of the fixing block 22. Then, the receiving beam 24 is moved outward in the vertical direction by a pair of jacks 30 installed between the other end wall 10E and the receiving beam 24, and accordingly, the fixing block is connected via the tension rod 26. 22 is moved to the outer side in the vertical direction, whereby 38 vertical PC steel materials 102 are collectively tensioned.

  On the other hand, one end portion of each lateral PC steel material 104 is connected to the protruding portion 60a of each auxiliary PC steel material 60 disposed on one side wall 10B, and the other end portion is formed on the fixing block 42. In the state of being inserted through the insertion hole, the fixing tool 52 fixes the fixing block 42 on the outer end surface in the lateral direction. Then, the receiving beam 44 is moved laterally outward by a pair of jacks 50 installed between the other side wall 10 </ b> C and the receiving beam 44, and accordingly, the fixing block 42 is moved via the tension rod 46. It moves to the outside in the lateral direction, thereby tensioning the 22 lateral PC steel members 104 for each bi-directional pretensioning member 100 together. This operation is performed individually for each of the 21 pretension introduction devices 40.

  Next, concrete is placed in the molds installed in each of the 21 locations and cured for a predetermined time.

  Thereafter, in each pretension introduction device 40, the tension of the 22 transverse PC steel members 104 by the pair of jacks 50 is released at once. Then, after the tension release is completed, the pretension introduction device 20 releases the tension of the 38 longitudinal PC steel members 102 by the pair of jacks 30 at once.

  Finally, after cutting off the protruding portion from each mold in each longitudinal PC steel material 102 and each transverse PC steel material 104, the two-way pretension member 100 is taken out from each of these molds.

  Next, the effect of this embodiment is demonstrated.

  In the present embodiment, 21 two-way pretension members 100 in which 38 longitudinal PC steel members 102 and 22 transverse PC steel members 104 are arranged in a concrete member 106 are provided at 21 locations in the longitudinal direction. At the same time, a vertical production bed 10 in which the vertical and horizontal vertical cross-sectional shapes are both set to be substantially U-shaped is used, and one side wall 10B of the production bed 10 is formed on one side wall 10B. With one end of each lateral PC steel material 104 fixed, by using the jack 50 installed on the other side wall 10C of the production bed 10, each lateral PC steel material 104 is tensioned and released, thereby releasing both side walls. A lateral prestress is introduced into each concrete member 106 placed between 10B and 10C, and the production bed 10 is With one end of each longitudinal PC steel material 102 fixed to one end wall 10D, the tension of each longitudinal PC steel material 102 using the jack 30 installed on the other end wall 10E of the production bed 10 Since the tension is released, the prestress in the vertical direction is collectively introduced into the 21 concrete members 106 placed between the both end walls 10D and 10E. Advantageous effects can be obtained.

  That is, since the prestress is introduced in two directions using the self-contained production bed 10, a reaction device having a long horizontal reaction force anchor as in the prior art becomes unnecessary, and therefore The cost of manufacturing equipment for the two-way pretension member 100 can be reduced, and the tension force of each longitudinal PC steel material 102 and each transverse PC steel material 104 can be easily managed. Can be easily performed.

  In addition, in the present embodiment, in each of the 21 locations, 22 auxiliary PC steel members 60 are arranged so as to penetrate the side wall 10B laterally with respect to one side wall 10B, and each of these auxiliary PCs is disposed. Prestress is introduced into the steel material 60 in advance, and the fixing of one end portion of the 22 transverse PC steel materials 104 to the side wall 10 </ b> B is performed with one end portion of the 22 transverse PC steel materials 104 and 22 auxiliary members. Since it carries out by connecting with the protrusion part 60a from the inner surface of the side wall 10B in the PC steel material 60, the following effects can be obtained.

  That is, as shown in FIG. 8A, if the auxiliary PC steel material 60 does not exist, the fixing of the 22 lateral PC steel materials 104 to the side wall 10B at one end is formed on the side wall 10B. This is performed on the outer surface of the side wall 10 </ b> B in a state in which each of the 22 lateral PC steel members 104 is inserted into the insertion hole. For this reason, the length L1 of the portion from the side end surface of the concrete member 106 to the fixing position in each of the lateral PC steel materials 104 is considerably long, and this portion extends due to tension and contracts due to tension release. The displacement amount D1 of the concrete member 106 is considerably large.

  For this reason, the longitudinal PC steel material 102 located between the concrete member 106 that has been subjected to tension release and the concrete member 106 that is located on both sides in the longitudinal direction and that has not been subjected to tension release is inclined with respect to the longitudinal direction. Will be greatly deformed. And thereby, there exists a possibility that the peripheral area | region of each longitudinal direction PC steel material 102 in the longitudinal direction edge part of the concrete member 106 in which tension | tensile_strength was released may be damaged, and there exists a possibility that a worker may be in danger. .

  On the other hand, in this embodiment, as shown in the same figure (b), 22 auxiliary PC steel materials 60 are arranged in the side wall 10B in a state where pre-stress is introduced in advance, and 22 lateral directions are provided. Fixing of one end of the PC steel material 104 to the side wall 10B is performed by connecting one end of the 22 transverse PC steel materials 104 and the protruding portion 60a from the inner surface of the side wall 10B of the 22 auxiliary PC steel materials 60. Therefore, the contraction due to the release of the tension is caused by the portion from the side end surface of the concrete member 106 to the connecting position with each auxiliary PC steel 60 in each lateral PC steel 60 and the protrusion of each auxiliary PC steel 60. The total length with the portion 60a is L2, and the length can be shortened by the thickness of the side wall 10B. Therefore, the displacement D2 of the concrete member 106 due to the tension release is sufficiently small. It can be.

  For this reason, the longitudinal PC steel material 102 located between the concrete member 106 that has been subjected to tension release and the concrete member 106 that is located on both sides in the longitudinal direction and that has not been subjected to tension release is inclined with respect to the longitudinal direction. Only slightly deformed. As a result, the risk of damaging the peripheral region of each longitudinal PC steel material 102 at the longitudinal end of the concrete member 106 can be eliminated, and the risk of danger to workers can be eliminated. This also allows the tension release of the 22 transverse PC steel members 104 to each of the concrete members 106 placed at the 21 locations to be quickly performed in an arbitrary procedure between the locations.

  As described above, according to the present embodiment, when a plurality of the two-way pretension members 100 are simultaneously manufactured in series, it is possible to ensure the desired quality and work safety while maintaining work efficiency. it can.

  In particular, in the present embodiment, the connection between the 22 transverse PC steel members 104 and the 22 auxiliary PC steel members 60 is performed using the coupler 64 for each of the transverse PC steel members 104 and each of the auxiliary PC steel members 60. Therefore, both PC steel materials 104 and 60 can be connected with a simple configuration and a simple operation.

  In the present embodiment, a box-shaped production bed in which both end walls 10D and 10E and both side walls 10B and 10C are continuously formed is used as the production bed 10. Despite the fact that the wall thicknesses of the section walls 10D and 10E and the side walls 10B and 10C are relatively thin, the reaction force is exerted when the longitudinal PC steel members 102 and the transverse PC steel members 104 are tensioned. Can be.

  By the way, in the said embodiment, although the production bed made from a reinforced concrete was used as the production bed 10, you may make it use the production bed made from a reinforced concrete suitably reinforced with PC steel materials.

  Moreover, in the said embodiment, although the two-way pretension member 100 used as the manufacture object was demonstrated as what is a horizontally long concrete slab, even when it is a member which has a shape other than this, the said embodiment By adopting this manufacturing method, it is possible to obtain the same effects as in the case of the above embodiment.

  Next, a modification of the above embodiment will be described.

  First, a first modification of the above embodiment will be described.

  FIG. 9 is a view similar to FIG. 7 showing the main part of the production bed and its attached devices used in the method for producing a bidirectional pretension member according to this modification. FIG. 10 is a sectional view taken along line XX in FIG.

  As shown in these drawings, in this modification, 23 auxiliary PC steel members 60, which are one more than 22 transverse PC steel members 104, are arranged in each of the 21 locations, and these 23 auxiliary members are arranged. The PC steel 60 and the 22 transverse PC steels 104 are connected as follows.

  That is, in this modified example, the prestress is introduced into each auxiliary PC steel material 60, and a belt-like fixing steel material 70 is arranged inside the one side wall 10B with a predetermined distance from the inner side surface of the side wall 10B. The fixing steel material 70 is fixed with the protrusions 60a of the auxiliary PC steel materials 60 fixed by the fixing tool 62, and the connection between the 22 lateral PC steel materials 104 and the 23 auxiliary PC steel materials 60 is performed. Each lateral PC steel material 104 is fixed to a fixing steel material 70 by a fixing tool 52.

  At that time, 22 U-shaped grooves 70a for inserting 22 lateral PC steel materials 104 are formed in the fixing steel material 70 at predetermined intervals in the vertical direction. Twenty-three insertion holes 70b for inserting the 23 auxiliary PC steel members 60 are formed at each intermediate position of the groove 70a and at both longitudinal sides thereof. The fixing steel material 70 is connected and fixed to the belt-like support steel plate 72 arranged so as to extend in the vertical direction along the inner surface of the side wall 10B via 23 cylindrical steel materials 74. . In the supporting steel plate 72, 23 insertion holes 72a for inserting the 23 auxiliary PC steel materials 60 are formed at positions facing the 23 insertion holes 70b. Moreover, each cylindrical steel material 74 is arrange | positioned so that the straight line which ties each insertion hole 72a and each insertion hole 70b may be enclosed.

  By adopting the connection structure of this modified example, the portion of each lateral PC steel material 104 that shrinks due to the release of tension is extended from the side end surface of the concrete member 106 to the fixing position on the fixing steel material 70 in the lateral PC steel material 104. It can be the length L3 of only the part. As a result, the length of the portion that shrinks when the tension is released can be further shortened by the distance between the inner surface of the side wall 10B and the fixing steel material 70 than in the case of the above embodiment. The displacement amount of 106 can also be made smaller than in the case of the above embodiment.

  In addition, in this modified example, the insertion of each lateral PC steel material 104 into each U-shaped groove 70a formed in the fixing steel material 70 is performed by passing the lateral PC steel material 104 in a state in which the fixing tool 52 is still attached to the U. Since it can be performed by inserting it into the groove 70a from above, it is possible to easily perform the fixing operation of each of the lateral PC steel materials 104 to the fixing steel material 70.

  Next, a second modification of the above embodiment will be described.

  FIG. 11 is a view similar to FIG. 6, showing a production bed 110 and its attachment devices used in the method for producing a bidirectional pretension member according to this modification. FIG. 12 is a detailed view of the portion XII in FIG.

  As shown in these drawings, in this modification, as the production bed 110, a double production bed in which the vertical cross-sectional shape in the lateral direction is set to a double U-shape is used, and a plurality of vertical production beds are used. The two-way pretensioning member 100 is manufactured in pairs at each location.

  That is, in the present modification, at each of the 21 locations, 22 auxiliary PC steel materials 60 are penetrated laterally through the central side wall 10F with respect to the central side wall 10F located at the lateral center of the production bed 110. The pre-stress is previously introduced into each of these auxiliary PC steel members 60, and each of the 22 auxiliary PC steel members 60 is arranged on each side of the central side wall 10F. It is designed to be shared when introducing prestress in the lateral direction. The wall thickness of the central side wall 10F is set to a value (specifically, about 2 m) that is slightly larger than the wall thickness of the side wall 10B of the above embodiment.

  The production bed 110 used in this modification is configured as a double production bed, but the configuration of each part is the same as the configuration of the production bed 10 of the above embodiment. Moreover, about the connection method of 22 transverse direction PC steel materials 104 and 22 auxiliary PC steel materials 60 in the both sides of the central side wall 10F, as in the case of the said embodiment, each transverse direction PC steel material 104 and each auxiliary PC steel material The operation is performed every 60 using the coupler 64.

  By employing the manufacturing method of this modification, the manufacturing efficiency of the two-way pretension member 100 can be increased, and the auxiliary PC steel material 60 can be effectively used.

  In this modification, instead of using the coupler 64 as in the above embodiment, the connection between the 22 lateral PC steel members 104 and the 22 auxiliary PC steel members 60 on both sides of the central side wall 10F is performed as described above. It is also possible to use the fixing steel material 70 as in the modification.

  In addition, the numerical value shown as a specification in the said embodiment and each modification is only an example, and of course, you may set these to a different value suitably.

It is a figure which shows the production bed used for the manufacturing method of the bidirectional | two-way pretension member which concerns on one Embodiment of this invention in the state with which the predetermined | prescribed attachment apparatus was mounted | worn, Comprising: The figure (a) is a top view, the figure (B) is a sectional side view Detailed view of part II in Fig. 1 Detailed view of part III in Fig. 1 Detail view of section IV in Fig. 1 Detailed view of part V in FIG. Detailed cross-sectional view taken along line VI-VI in Fig. 1 Detailed view of VII in Fig. 6 It is a figure for demonstrating the effect | action of the said embodiment, Comprising: The principal part detail drawing of FIG. The same figure as FIG. 7 which shows the principal part of the production bed used for the manufacturing method of the bidirectional | two-way pretension member which concerns on the 1st modification of the said embodiment, and its attachment apparatus. XX sectional view of FIG. The figure similar to FIG. 6 which shows the production bed used for the manufacturing method of the bidirectional | two-way pretension member which concerns on the 2nd modification of the said embodiment, and its attachment apparatus. Detailed view of XII section in Fig. 11

Explanation of symbols

2 Ground 10 and 110 Production bed 10A Bottom wall 10B, 10C Side wall 10Ba, 10Ca Hunch part 10D, 10E End wall 10Da, 10Ea Inclined surface 10F Central side wall 20, 40 Pretension introducing device 22, 42 Fixing block 24, 44 Receiving Beam 26, 46 Tension rod 28, 48 Nut 30, 50 Jack 32, 52, 62 Fixing tool 60 Auxiliary PC steel 60a Protruding part 64 Coupler 70 Fixing steel 70a U-shaped groove 70b, 72a Insertion hole 72 Support steel plate 74 Cylindrical steel 100 Bidirectional pretensioning member 102 Longitudinal PC steel material 104 Transverse PC steel material 106 Concrete member

Claims (4)

Bidirectional pretension in which a plurality of longitudinal PC steel materials extending in the longitudinal direction and a plurality of transverse PC steel materials extending in the transverse direction so as to intersect the longitudinal PC steel materials are disposed in the concrete member. In the method of simultaneously manufacturing a plurality of members at a plurality of locations in the vertical direction,
Using a production bed in which the horizontal vertical cross-sectional shape is set to a substantially U-shape,
With one end of each lateral PC steel material fixed on one side wall of the production bed, the tension and release of each lateral PC steel material is performed using a jack installed on the other side wall of the production bed. By introducing lateral prestress into each concrete member placed between the both side walls,
At that time, in each of the plurality of locations, a plurality of auxiliary PC steel materials are disposed so as to penetrate the side wall in a lateral direction with respect to the one side wall, and pre-stress is applied to each of the auxiliary PC steel materials in advance. Introducing and fixing one end portion of the plurality of transverse PC steel materials to the one side wall, the end portion of the plurality of transverse PC steel materials and the side walls of the plurality of auxiliary PC steel materials A method for producing a bi-directional pretension member, comprising: connecting a protruding portion from a side surface.   2. The connection between the plurality of transverse PC steel materials and the plurality of auxiliary PC steel materials is performed using a coupler for each of the transverse PC steel materials and each of the auxiliary PC steel materials. A method for producing a bi-directional pretension member. Introducing prestress to each auxiliary PC steel material, a fixing steel material is arranged inside the one side wall at a predetermined distance from the inner side surface of the side wall, and the protruding portion of each auxiliary PC steel material is provided on the fixing steel material. Done in a fixed state,
2. The connection between the plurality of transverse PC steel materials and the plurality of auxiliary PC steel materials by fixing each of the transverse PC steel materials to the fixing steel material. A method for manufacturing a directional pretension member. As the production bed, a double production bed in which the vertical cross-sectional shape in the lateral direction is set to a double U-shape is used, and a pair of the two-way pretension members are arranged at a plurality of vertical positions of the production bed. Make it one by one,
At that time, in each of the plurality of locations, the plurality of auxiliary PC steel materials are arranged so as to penetrate the central side wall in the lateral direction with respect to the central side wall located in the lateral center of the production bed, Prestress is introduced into each of these auxiliary PC steel materials in advance, and the plurality of auxiliary PC steel materials are pre-stressed in the lateral direction with respect to each of the pair of concrete members arranged on both sides of the central side wall. The method for manufacturing a bi-directional pretension member according to any one of claims 1 to 3, wherein the method is shared when performing.

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