JP4904072B2 - Manufacturing method of pretension member - Google Patents

Description

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

  The pretension member has a configuration in which a plurality of PC steel materials are arranged in a concrete member. Such a pretension member is arranged in series as described in, for example, “Patent Document 1”. In many cases, a plurality of pieces are manufactured simultaneously.

  Further, in FIG. 4 of “Patent Document 2”, a plurality of longitudinal PC steel materials extending in the longitudinal direction, and a plurality of transverse PC steel materials extending in the lateral direction so as to intersect with the longitudinal PC steel materials, A method is described in which a plurality of bi-directional pretension members arranged in a concrete member are simultaneously manufactured at a plurality of longitudinal locations.

  Note that “Patent Document 3” describes that self-filled concrete having excellent fluidity is used as the concrete for placing.

Japanese Patent Laid-Open No. 10-58427 JP 2005-47233 A Japanese Patent Laid-Open No. 9-194247

  In order to simultaneously manufacture a plurality of pretension members at a plurality of locations, it is necessary to place concrete at each of the plurality of locations in a state where a plurality of PC steel materials are in tension.

  In this case, since the amount of concrete required for manufacturing each pretension member is constant, the concrete hopper is appropriately moved at each of a plurality of locations in a state where a predetermined amount of self-filling concrete is accommodated in the concrete hopper. If the self-filling concrete is placed in the formwork installed at each placement position from the concrete discharge port, the construction efficiency can be improved.

  At that time, the movement of the concrete hopper is generally performed in a state where it is suspended from an overhead crane, so that the operator who operates the overhead crane has a discharge amount from the concrete discharge port when placing the self-filled concrete. It is performed by supplying self-filling concrete so that it reaches every corner in the mold while visually judging to an appropriate amount.

  However, in such a concrete placement method, the quality of the pre-tension member is difficult to stabilize because the quality of placement depends greatly on the judgment ability of the worker (or work instructor). There's a problem.

  Moreover, in such a concrete placement method, the amount of placement of self-filling concrete varies, so the amount of self-filling concrete to be accommodated in the concrete hopper is equal to one pretension member (or a plurality of pieces). There is also a problem that it is necessary to set a considerably larger amount than the required amount of placing), and the surplus portion is wasted.

  In particular, when ultra high strength fiber reinforced concrete (UFC) is used as self-filling concrete, the orientation of the steel fibers will affect the concrete strength. In the concrete pouring work that has been performed, the orientation of the steel fibers is likely to be biased, and therefore the concrete strength tends to vary, and it is desirable to solve this.

  The present invention has been made in view of such circumstances, and in the case where a plurality of pretension members are simultaneously manufactured in series, a high-quality pretension member is used to minimize waste of materials. It aims at providing the manufacturing method of the pretension member which can be manufactured above.

  The present invention is intended to achieve the above object by devising a method for moving the concrete hopper.

That is, the manufacturing method of the pretension member according to the present invention is as follows:
In a method of simultaneously manufacturing a plurality of pretension members in which a plurality of PC steel materials extending in at least one of the vertical direction and the horizontal direction are arranged in a concrete member at a plurality of positions in the vertical direction,
Using a production bed in which the vertical cross-sectional shape in the lateral direction is set to be substantially U-shaped, the plurality of pretension members are produced between both side walls of the production bed,
At that time, a vertical movement carriage that can move in the vertical direction along the production bed is installed so as to straddle both side walls of the production bed, and is moved to the vertical movement carriage in the horizontal direction. A possible lateral movement cart is installed, and a concrete hopper is attached to the lateral movement cart,
The vertical movement carriage is moved in the vertical direction and sequentially stopped at each of the plurality of locations, and at each location, a predetermined amount of self-filling concrete is accommodated in the concrete hopper. The self-filling concrete in the concrete hopper is placed in a formwork installed at the placement position of the place while the carriage is moved in the lateral direction.

  The “pretension member” may be one in which a plurality of longitudinal PC steel members extending in the longitudinal direction are arranged in the concrete member, or a plurality of transverse PC steel members extending in the lateral direction are disposed in the concrete member. Alternatively, a plurality of longitudinal PC steel materials and a plurality of transverse PC steel materials may be disposed in the concrete member.

  The specific arrangement and number of the “plural PC steel materials” are not particularly limited.

  The specific number of the “plurality in the vertical direction” is not particularly limited.

  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 movement of the “vertical movement carriage” and the “lateral movement carriage” may be performed by automatic control, or may be manually performed by an operator's remote control operation or the like.

  The movement in the lateral direction at the time of placing the concrete in the “lateral movement carriage” may be a predetermined movement in one direction or a reciprocating movement in both directions.

  As long as the “concrete hopper” is configured to accommodate a predetermined amount of self-filling concrete, the specific shape, size, and the like are not particularly limited.

  The “predetermined amount” of self-filling concrete accommodated in the concrete hopper may be self-filling concrete for one pretension member, or may be self-filling concrete for a plurality of pretension members. Good.

  The “self-filling concrete” means concrete having higher fluidity than ordinary concrete, and in the present invention, means a concrete having a slump flow value of 50 cm or more.

  As shown in the above configuration, in the method of manufacturing a pretension member according to the present invention, a pretension member in which a plurality of PC steel materials extending in at least one of the vertical direction and the horizontal direction are arranged in a concrete member is provided. The vertical cross-sectional shape in the lateral direction is manufactured at the same time at a plurality of locations in the vertical direction between the side walls of the production bed, and the vertical direction along the production bed. A vertical movement cart that can be moved horizontally is installed so as to straddle both side walls of the production bed, and a horizontal movement cart that can be moved laterally is installed on this vertical movement cart. Further, a concrete hopper is attached to the lateral movement carriage, the longitudinal movement carriage is moved in the vertical direction, and sequentially stopped at each of the plurality of locations, and each of these locations is stopped. Then, with the concrete hopper containing a predetermined amount of self-filling concrete, the self-filling concrete in the concrete hopper is placed in the formwork installed at the placement position while moving the lateral movement carriage horizontally. Since the filling type concrete is placed, the following effects can be obtained.

  That is, when placing self-filled concrete in the formwork at each location in the vertical direction, a vertical moving carriage installed so as to straddle both side walls of the production bed is arranged along the production bed in the vertical direction. Since it is made to move and to stop in each said location sequentially, a concrete hopper can be accurately positioned to the placement position of each location regarding the vertical direction.

  In addition, the horizontal movement carriage installed on the vertical movement carriage is moved in the horizontal direction at each location in the vertical direction while the self contained in the concrete hopper attached to the horizontal movement carriage. Since the filling type concrete is placed in a formwork installed at the place of placement, the self-filling concrete is supplied to each position in the horizontal direction in the formwork substantially evenly. This allows the self-filling concrete to reach every corner of the formwork.

  In addition, since this placing operation is performed without being influenced by the judgment ability of an operator or the like as in the prior art, the quality of the completed pretension member can be stabilized. In addition, in this placing operation, there is almost no variation in the amount of the self-filling concrete to be placed. Therefore, the amount of the self-filling concrete to be accommodated in the concrete hopper is equal to one pretension member (or a plurality of pieces). It is sufficient to set a slightly larger amount than the required amount of placing), and therefore, it is possible to prevent the generation of useless self-filling concrete.

  As described above, according to the present invention, when a plurality of pretension members are simultaneously manufactured in series, a high-quality pretension member can be manufactured while minimizing material waste. Moreover, according to the present invention, it is possible to simplify the concrete placing operation, thereby reducing the manufacturing cost of the pretension member.

  In particular, when ultra-high strength fiber reinforced concrete is used as self-filling concrete, the orientation of the steel fibers will affect the concrete strength. However, it is possible to manufacture a pretensioning member having a stable quality because the orientation of the steel fibers is not easily biased.

  In the above configuration, an auxiliary carriage movable in the horizontal direction is installed on the vertical movement carriage, and a finisher beam extending in the vertical direction is attached to the auxiliary carriage, and after the self-filling concrete is placed With the finisher beam placed over the top edges of both sides in the longitudinal direction of the formwork, the upper surface of the self-filling concrete placed in the formwork is leveled by moving the auxiliary carriage laterally. By doing so, the following operational effects can be obtained.

  In other words, the top finish when placing concrete can be done manually by the worker, but instead of doing this, the finisher beam is attached to the auxiliary carriage and moved. By doing so, the top end finishing can be performed easily and accurately, whereby the quality of the pretension member can be further improved and the manufacturing cost can be further reduced.

  The top finish with this finisher beam can be performed by moving the auxiliary carriage regardless of the movement of the lateral movement carriage after the self-filling concrete is placed. With the finisher beam placed behind the concrete discharge port of the concrete hopper in the lateral direction, the lateral movement carriage moves laterally while placing self-filling concrete. If it is performed in the same direction as the moving carriage, the self-filling concrete supplied from the concrete discharge port can be more easily distributed to every corner of the mold.

  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 pretension member according to an embodiment of the present invention in a state where a predetermined accessory device is mounted, and FIG. FIG. 4B is a side sectional view.

  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 a 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 pretension member 100 to be manufactured in the present embodiment includes 38 (upper and lower two stages) longitudinal PC steel members 102 extending in the longitudinal direction and transverse directions so as to intersect these longitudinal PC steel materials. The two horizontal PC steel members 104 extending in the direction are two-way pretension members arranged in the concrete member 106, and are configured as horizontally-long rectangular concrete slabs. In the present embodiment, 21 pretension members 100 are manufactured simultaneously at 21 locations in the vertical direction in the work space of the production bed 10.

  In the process of manufacturing these 21 pretension members 100, lateral prestress and vertical prestress are introduced into each pretension 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.

  Similarly, on one side wall 10B, 22 insertion holes (not shown) for inserting the 22 transverse PC steel members 104 at predetermined positions in the longitudinal direction are provided at positions corresponding to the 21 locations. It is formed so as to penetrate in the lateral direction at intervals.

  Further, the 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 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, each lateral PC steel material 104 is fixed by the fixing tool 52 on the outer surface of the side wall 10B in a state where one end thereof is inserted into the insertion hole formed in the one side wall 10B, and the other end is fixed. Then, in the state of being inserted through the insertion hole formed in the fixing block 42, the fixing block 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 outer side in the lateral direction, thereby tensioning the 22 lateral PC steel members 104 for each 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. This placing work is performed using self-filling concrete as described later.

  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. At this time, in order to minimize the displacement of each pretensioning member 100 due to this tension release, the tension release is performed little by little for each pretension introduction device 40 in order. After this 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 pretension member 100 is taken out from each of these molds.

  Next, the concrete placing process in the manufacturing process of the pretension member 100 will be described.

  FIG. 7 is a view similar to FIG. 6 (more precisely, a sectional view taken along line VII-VII in FIG. 8) showing this concrete placing step, and FIG. 8 is a plan view thereof. FIG. 9 is a detailed view of the main part of FIG.

  As shown in these drawings, in the concrete placing process, a placing device 210 installed on the production bed 10 is used to form a mold 200 previously installed at each of the 21 placement positions. The self-filling concrete C is placed in the mold 200. At this time, each mold 200 is installed via a plurality of support members 202 installed on the upper surface of the bottom wall 10 </ b> A of the production bed 10.

  Before describing a specific placing procedure in the concrete placing step, the configuration of the placing apparatus 210 will be described.

  The placing device 210 includes a vertical movement carriage 212 installed across the side walls 10B and 10C of the production bed 10, and a horizontal movement carriage 214 installed on the vertical movement carriage 212. A concrete hopper 216 mounted on the lateral movement carriage 214, an auxiliary carriage 218 installed on the vertical movement carriage 212, and a finisher beam 220 attached to the auxiliary carriage 218 are provided.

  The vertical movement carriage 212 is configured to move in the vertical direction along the production bed 10. Specifically, the vertical movement carriage 212 was placed on a pair of rails 222 extending in the vertical direction fixed to the upper surfaces of the side walls 10B and 10C of the production bed 10 via H-shaped steel. A pair of traveling carriages 224, and a pair of transverse beams 226 made of H-beams spanning the pair of traveling carriages 224 at a predetermined interval in the vertical direction, By driving 224, it can move in the vertical direction.

  The lateral movement carriage 214 is configured to be able to move in the lateral direction on the longitudinal movement carriage 212. Specifically, the lateral movement carriage 214 is arranged at a predetermined interval in the lateral direction with a pair of rails 228 made of a square steel pipe extending in the lateral direction fixed to the upper surface of the lateral beam 226 of the longitudinal movement carriage 212. A pair of traveling carriages 230 that are placed so as to be bridged, and a frame structure portion 232 that is fixed to the upper part of the pair of traveling carriages 230 in a state of being assembled in a cross beam shape. The vehicle can move in the lateral direction by driving the traveling carriage 230 near the side wall 10C.

  The concrete hopper 216 is supported by the frame structure portion 232 in a state of being disposed inside the frame structure portion 232 in the lateral movement carriage 214. At this time, the concrete hopper 216 is suspended and supported by the frame structure portion 232 via a plurality of suspension wires 234, whereby the concrete discharge port 216 a formed at the lower end portion of the concrete hopper 216 is used as a formwork. It is positioned at a predetermined height slightly above the upper edge 200a of 200.

  The concrete hopper 216 is a round bucket-shaped hopper, and the amount required for placing one pretensioning member (that is, the amount necessary for placing and forming the concrete member 106 of each pretensioning member 100). However, the self-filling concrete C can be accommodated to some extent. In the concrete hopper 216, the self-filling concrete C is supplied from the concrete discharge port 216a by driving the opening / closing mechanism 216b.

  The auxiliary carriage 218 is configured to move in the lateral direction below the longitudinal movement carriage 212. Specifically, the auxiliary carriage 218 is suspended by a pair of rails 236 made of I-shaped steel extending in the lateral direction and fixed to the lower surfaces of the pair of transverse beams 226 in the longitudinal movement carriage 212. A mode of moving in conjunction with the movement of the direction moving carriage 214 and a mode of moving independently of the movement of the lateral movement carriage 214 can be adopted.

  The finisher beam 220 is made of I-shaped steel that extends in the vertical direction, and is suspended and supported by the auxiliary carriage 218 via two sets of vertical jacks 238 and diagonal jacks 240 at two positions in the vertical direction. At that time, each vertical jack 238 is a rod-like hydraulic jack arranged so as to extend in the vertical direction, while each oblique jack 240 is a rod-like shape extending obliquely upward toward the side wall 10B from the finisher beam 220. It is a hydraulic jack, and the height and angle of the finisher beam 220 can be adjusted by the two sets of the vertical jack 238 and the oblique jack 240.

  Note that a vibrator (not shown) such as a box-type vibrator is attached to the finisher beam 220. Further, a work passage and an outer handrail (both not shown) are attached to the vertical movement carriage 212 and the horizontal movement carriage 214.

  Next, a specific placing procedure in the concrete placing process will be described.

  First, as shown in FIG. 8, the vertical movement carriage 212 is moved in the vertical direction (specifically, the end wall from the above-mentioned 21 places where the concrete placement is completed to the place where the concrete placement is to be performed next. 10E to the end wall 10D) and stop at the center position in the vertical direction of the mold 200 installed at the placement position. At this time, the lateral movement carriage 214 is kept waiting at the end position near the side wall 10 </ b> C on the vertical movement carriage 212. The concrete hopper 216 mounted on the lateral movement carriage 214 is filled with self-filling concrete C for one pretension member. Specifically, the amount of concrete required for placing and forming the concrete member 106 of each pretension member 100 is about 3.8 cubic meters, and a self-filling concrete C of about 4 cubic meters, which is slightly larger than this, is used as a concrete hopper. 216 is filled.

  Next, the lateral movement carriage 214 is moved laterally at a constant speed toward the side wall 10B. At this time, the auxiliary carriage 218 is also moved laterally at a constant speed toward the side wall 10B together with the lateral movement carriage 214. At this time, the auxiliary carriage 218 is moved by spanning the finisher beam 220 to the upper end edges 200a on both sides in the vertical direction of the formwork 200 on the side wall 10C side (that is, the rear side in the moving direction) from the concrete outlet 216a of the concrete hopper 216. Perform in the state.

  Then, while moving the lateral movement carriage 214 toward the side wall 10B in this way, the self-filling concrete C in the concrete hopper 216 is placed in the mold 200 positioned below the side carriage 10B. At this time, the self-filling type concrete C having excellent fluidity is supplied into the mold frame 200 from the concrete discharge port 216a of the concrete hopper 216, and then covers each longitudinal PC steel material 102 and each transverse PC steel material 104. Thus, it quickly expands to the inner wall of the peripheral wall of the mold 200. At this time, the finisher beam 220 also moves toward the side wall 10B so as to follow the concrete discharge port 216a. Therefore, the formwork is formed in the self-filling concrete C supplied into the formwork 200 by the finisher beam 220. The portion of the top 200 that swells upward from the upper edge 200a is pushed and expanded toward the side wall 10B, so that the top surface of the self-filling concrete C is approximately the same height as the upper edge 200a of the mold 200. Is done.

  Then, as shown in FIG. 10, the lateral movement carriage 214 moves to the end position on the side wall 10B side, and the supply of the self-filling concrete C from the concrete hopper 216 is completed, but the auxiliary carriage 218 moves as it is. The finisher beam 220 is guided to the end position on the side wall 10B side of the mold 200. As a result, the upper surface of the self-filling concrete C is leveled over the entire surface, and the self-filling concrete C is completely spread to every corner in the mold 200.

  Thereafter, as shown in FIG. 11, with the lateral movement carriage 214 stopped at the end position on the side wall 10B, the auxiliary carriage 218 is moved in the reverse direction to the end position on the side wall 10C, This is moved again to the end position on the side wall 10B side. As a result, the upper surface of the self-filling concrete C is leveled again by the finisher beam 220 that moves together with the auxiliary carriage 218, and the accuracy of the top end finish is increased. As indicated by a two-dot chain line in the figure, when the auxiliary carriage 218 is moved in the reverse direction, the vertical jack 238 and the oblique jack 240 are operated to move the finisher beam 220 somewhat upward, and the self-filling type Try to avoid interference with concrete C.

  As described above in detail, in the present embodiment, 38 longitudinal PC steel members 102 and 22 transverse PC steel members 104 are arranged in the concrete member 106 using the box-shaped production bed 10. 21 pretension members 100 are manufactured at 21 locations in the vertical direction at the same time. At this time, a vertical movement carriage 212 that can move in the vertical direction along the manufacturing bed 10 is provided. Are installed so as to straddle both side walls 10B and 10C, and a lateral movement carriage 214 which is movable in the lateral direction is installed on the longitudinal movement carriage 212, and further, this lateral movement carriage is used. A concrete hopper 216 is attached to the carriage 214, and the vertical movement carriage 212 is moved vertically to stop at each of the 21 locations. In a state in which the self-filling concrete C for one pretension member is accommodated in the hopper 216, the lateral movement carriage 214 is moved in the lateral direction, and the inside of the mold 200 installed at the placement position of the part is placed. Since the self-filling concrete C in the concrete hopper 216 is placed, the following operational effects can be obtained.

  That is, when the self-filling concrete C is placed in the formwork 200 at each position in the vertical direction, the vertical movement carriage 212 installed so as to straddle both side walls 0B and 10C of the manufacturing bed 10 is manufactured. Since it is moved along the bed 10 in the vertical direction and stopped at the respective locations in sequence, the concrete hopper 216 can be accurately positioned at the placement positions at the respective locations in the vertical direction.

  Further, the horizontal movement carriage 214 installed on the vertical movement carriage 212 is moved in the horizontal direction at each position in the vertical direction, while the concrete hopper 216 mounted on the horizontal movement carriage 214 is moved. Since the accommodated self-filling concrete C is placed in the formwork 200 installed at the place of placement, the self-filling concrete C is placed in the transverse direction in the formwork 200. Thus, the self-filling concrete C can be distributed to every corner of the mold 200.

  In addition, since this placing operation is performed without being influenced by the judgment ability of an operator or the like as in the prior art, the quality of the completed pretension member can be stabilized. Further, in this placing operation, there is almost no variation in the amount of placement of the self-filling concrete C. Therefore, the amount of the self-filling concrete C that should be accommodated in the concrete hopper 216 is set to be equal to that of one pretension member. It is sufficient to set a slightly larger amount than the required amount, so that almost no useless self-filling concrete C can be generated.

  As described above, according to the present embodiment, when a plurality of pretension members 100 are simultaneously manufactured in a series arrangement, the high-quality pretension member 100 can be manufactured while minimizing waste of materials. it can. In addition, according to the present invention, the concrete placing operation can be simplified, and thereby the manufacturing cost of the pretension member 100 can be reduced.

  In particular, when super high strength fiber reinforced concrete is used as the self-filling concrete C, the orientation of the steel fibers will affect the concrete strength. Since the installation work is performed substantially uniformly without being influenced by the judgment ability of the worker or the like, the orientation of the steel fibers is not easily biased, and therefore it is possible to manufacture the pretension member 100 with stable quality. Become.

  Furthermore, in the present embodiment, an auxiliary carriage 218 that can move in the horizontal direction is installed on the vertical movement carriage 212, and a finisher beam 220 that extends in the vertical direction is attached to the auxiliary carriage 218. After the filling type concrete C is placed, the auxiliary carriage 218 is moved in the horizontal direction in a state where the finisher beam 220 is arranged so as to be bridged over the upper end edges 200a on both sides in the vertical direction of the mold frame 200. Since the top surface of the self-filling concrete C placed on the floor is leveled, the top end finishing at the time of placing the concrete is easier than when it is performed manually by an operator and As a result, the quality of the pretension member 100 can be further improved and the manufacturing cost can be further reduced. It is possible.

  Moreover, in this embodiment, when the lateral movement carriage 214 moves laterally while placing the self-filling concrete C, the auxiliary carriage 218 is moved in the same direction as this. At this time, the finisher beam 220 attached to the auxiliary carriage 218 is arranged behind the concrete discharge port 216a of the concrete hopper 216 in the moving direction, and is supplied from the concrete discharge port 216a. The self-filled concrete C to be distributed can be more easily distributed to every corner of the mold 200. Furthermore, in the present embodiment, even after the completion of the placement of the self-filling concrete C, the auxiliary carriage 218 is moved, and the upper surface of the self-filling concrete C by the finisher beam 220 is repeatedly performed. Therefore, the top finish accuracy can be increased.

  In the above embodiment, the leveling of the upper surface of the self-filling concrete C by the finisher beam 220 has been described as being repeated only once, but may be repeated two or more times. The end finishing accuracy can be further increased.

  Further, in the above embodiment, when the auxiliary cart 218 moves toward the end position on the side wall 10B side, the finisher beam 220 may be vibrated by a vibrator attached to the finisher beam 220. By doing so, the leveling effect by the finisher beam 220 can be further enhanced.

  Further, in the above-described embodiment, the concrete movement at each location in the vertical direction is set in the state where the self-filling concrete C for one pretension member is accommodated in the concrete hopper 216 in the horizontal direction. The self-filling concrete C accommodated in the concrete hopper 216 has been described as being placed in the mold 200 while being moved. However, instead of doing this, the concrete hopper 216 is replaced with a large capacity hopper. The self-filled concrete C corresponding to a plurality of pretension members is accommodated in the concrete hopper 216, and the self-contained self in the concrete hopper 216 is moved while the lateral movement carriage 214 is moved laterally. A portion of the filled concrete C is cast into the formwork 200 and the remaining self It is also possible to Hama-type concrete C to allow use in concreting in the next place (or even the next point). At that time, if the opening / closing mechanism 216b of the concrete hopper 216 is appropriately controlled to open / close in conjunction with the movement of the lateral movement carriage 214, the amount of the self-filled concrete C to be placed is adjusted to an appropriate amount. Is possible.

  By the way, in the above-described embodiment, it has been described that the lateral movement carriage 214 moves toward the side wall 10B at the time of placing concrete, but instead of doing this, it is configured to move toward the side wall 10C. Of course it is possible. Alternatively, instead of doing this, it is possible to place concrete while moving to the side wall 10B side at a certain place, and to place concrete while moving to the side wall 10C side at the next place. is there.

  In the above-described embodiment, the leveling of the upper surface of the self-filling concrete C by the finisher beam 220 has been described as being performed by movement in one direction of the finisher beam 220. However, to the auxiliary carriage 218 of the finisher beam 220 By appropriately devising the mounting structure, it is possible to perform leveling by the finisher beam 220 when the finisher beam 220 moves in any direction.

  In the above embodiment, the pretension member 100 to be manufactured is described as a horizontally long rectangular concrete slab. However, even when the pretension member 100 is a member having a shape other than this, the manufacture of the above embodiment is performed. By adopting the method, it is possible to obtain the same operational effects as in the case of the above embodiment.

  Moreover, in the said embodiment, although the case where the pretension member 100 used as the manufacture object was a two-way pretension member was demonstrated, also when it is a pretension member where PC steel materials are arranged only in one direction, By adopting the manufacturing method of the above embodiment, the same effect as that of the above embodiment can be obtained.

  Further, in the above embodiment, a box-shaped production bed is used as the production bed 10, but the vertical cross-sectional shape in the horizontal direction is set to be substantially U-shaped so that the vertical movement carriage 212 can be installed. If so, it is also possible to use a production bed having a shape other than a box shape.

  In addition, the numerical value shown as a specification in the said embodiment 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 pretension member which concerns on one Embodiment of this invention in the state in which the predetermined | prescribed attachment apparatus was mounted | worn, Comprising: The figure (a) is a top view, The figure (b) ) Is a cross-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 The same figure as FIG. 6 which shows the concrete placement process in the manufacturing method of the said pretension member (To be exact, the sectional view taken along the line VII-VII in FIG. 8) Plan view showing the concrete placing process Detailed view of the main part of FIG. The same figure as FIG. 7 which shows the said concrete placement process (the 2) The same figure as FIG. 7 showing the concrete placing process (part 3)

Explanation of symbols

2 Ground 10 Production bed 10A Bottom wall 10B, 10C Side wall 10Ba, 10Ca Hunch part 10D, 10E End wall 10Da, 10Ea Inclined surface 20, 40 Pretension introduction device 22, 42 Fixing block 24, 44 Receiving beam 26, 46 Tension Rod 28, 48 Nut 30, 50 Jack 32, 52 Fixing tool 100 Pretension member 102 Longitudinal PC steel material 104 Transverse PC steel material 106 Concrete member 200 Formwork 200a Upper edge 202 Support member 210 Placing device 212 Longitudinal moving carriage 214 Carriage for lateral movement 216 Concrete hopper 216a Concrete outlet 216b Opening / closing mechanism 218 Auxiliary carriage 220 Finisher beam 222, 228, 236 Rail 224, 230 Traveling carriage 226 Horizontal beam 232 Frame Vertical jack structure 234 hanging wire 238 240 obliquely jack C self-compacting type of concrete

Claims (3)

In a method of simultaneously manufacturing a plurality of pretension members in which a plurality of PC steel materials extending in at least one of the vertical direction and the horizontal direction are arranged in a concrete member at a plurality of positions in the vertical direction,
Using a production bed in which the vertical cross-sectional shape in the lateral direction is set to be substantially U-shaped, the plurality of pretension members are produced between both side walls of the production bed,
At that time, a vertical movement carriage that can move in the vertical direction along the production bed is installed so as to straddle both side walls of the production bed, and is moved to the vertical movement carriage in the horizontal direction. A possible lateral movement cart is installed, and a concrete hopper is attached to the lateral movement cart,
The vertical movement carriage is moved in the vertical direction and sequentially stopped at each of the plurality of locations, and at each location, a predetermined amount of self-filling concrete is accommodated in the concrete hopper. A method for producing a pretension member, characterized in that the self-filling concrete in the concrete hopper is placed in a formwork installed at a placement position of the place while the carriage is moved laterally. In addition to installing an auxiliary carriage that can move in the horizontal direction on the vertical movement carriage, a finisher beam extending in the vertical direction is attached to the auxiliary carriage,
After placing the self-filling concrete, the auxiliary carriage is moved in the horizontal direction in a state where the finisher beam is arranged so as to span the upper end edges on both sides in the longitudinal direction of the formwork. 2. The method for producing a pretension member according to claim 1, wherein the top surface of the self-filling concrete placed on the surface is leveled.   When the lateral movement carriage moves laterally while placing self-filling concrete, the finisher beam is placed behind the concrete discharge port of the concrete hopper in the movement direction. 3. The method of manufacturing a pretension member according to claim 2, wherein the pretensioning member is disposed in the same direction as the lateral movement carriage in the arranged state.

Images