JP4029108B1 - PC member manufacturing apparatus and manufacturing method - Google Patents

Abstract

A PC member manufacturing apparatus and manufacturing method capable of manufacturing a large number of high-quality PC members (prestressed concrete members) at a time.
A manufacturing apparatus 100 is composed of an abut unit composed of tension side abuts 51 and 51 and a reaction force receiving side abut 54, and one or more mold units 10 disposed between the abut units. The The mold unit 10 is composed of side frames 1 and 2 and side frames 42 and 42 that are opposed to each other while the bottom frame 43 and the steel materials 7 for PC penetrate therethrough. Are formed with vertical slits 11 and 21, respectively. One vertical slit is provided with a plurality of concave grooves 12,... And a lock mechanism for locking the PC steel material 7 accommodated in each concave groove 12.
[Selection] Figure 3

Description

  The present invention relates to a manufacturing apparatus and a manufacturing method used when a PC member is manufactured by a pretension method, and more particularly to a PC member manufacturing apparatus and a manufacturing method capable of improving the manufacturing efficiency.

  Generally, a prestressed concrete member (hereinafter referred to as a PC member) whose strength against tensile force and cracking is increased by applying a tension force (compression force) to concrete that is weak to tensile force in advance or after the concrete is cured. ) Is frequently used in the construction field. This prestress is introduced to concrete as prestress through the adhesion between PC steel and concrete such as PC steel wire, PC steel strand, and PC steel bar. It is. As a prestress introduction method, a tension force is introduced into the PC steel material in advance and the tension force is released after the concrete is hardened, and after the concrete is hardened, the concrete is put into the concrete (through a sheath tube or the like). ) There is a post-tension system that introduces tension to the embedded steel for PC.

  By the way, when manufacturing a PC member by the above-mentioned pretension method, a tension side abut provided with a tension jack and a reaction force receiving side abut against the tension force are arranged to face each other with a predetermined interval therebetween. A mold for producing a PC member is installed, and both ends of the PC steel material penetrating through the side wall of the mold are fixed to a tension side abut (its tension jack) and a reaction force receiving side abut. Before placing fresh concrete in the formwork, a tension force is introduced to the steel for PC with a jack, the concrete is placed, and after waiting for its hardening, the tension is released. A predetermined pre-stress is introduced into the system. As a conventional technique related to a manufacturing apparatus for such a PC member (PC structure or PC plate), for example, apparatuses disclosed in Patent Documents 1 and 2 can be cited.

In the conventional manufacturing equipment (formwork unit) that produces PC members by the pretension method, when installing steel for PC such as PC steel wire in the formwork, through holes for the number of steel wires are provided in the side frame. In general, there are a method of penetrating one by one, a method of passing a plurality of steel wires by providing a longitudinal long hole in the side frame, etc. It took a lot of time and manufacturing time, and as a result, it was directly connected to a rise in manufacturing cost. This problem cannot be solved even by the devices disclosed in Patent Documents 1 and 2 described above.
JP 2004-346630 A JP 2003-266422 A

  The present invention has been made in view of the above-described problems, and a PC member manufacturing apparatus and a manufacturing method capable of efficiently manufacturing a plurality of PC members at a time when a PC member is manufactured by a pre-tension method. The purpose is to provide.

  In order to achieve the above object, a PC member manufacturing apparatus according to the present invention is a PC member manufacturing apparatus for manufacturing a PC member provided with a steel material for PC into which prestress is introduced by a pre-tension method. The manufacturing apparatus includes an abut unit including a tension side abut, a reaction force receiving side abut that receives a reaction force when a tension force is introduced, and one or more formwork units disposed between the abut units. The mold unit includes at least a bottom frame, a first side frame and a second side frame that are opposed to each other through the steel for PC, and the first side frame; A vertical slit is formed at each corresponding position of the second side frame, and positioning fixing means for positioning and fixing the steel for PC is provided in any one of the vertical slits. That.

  Here, the steel material for PC includes an optional specification PC steel wire, PC steel bar, PC steel stranded wire, and the like. In addition, the PC member manufactured includes all precast PC members such as PC girders, PC pillars and PC floor slabs.

  The manufacturing apparatus of the present invention includes an abut unit composed of a tension side abut and a reaction force receiving side abut for imparting tension to a PC member, and one or more (generally two or more, PC between the abut units). It is generally composed of a large number of mold units for mass production of members.

  Here, each mold unit is formed of, for example, a steel bottom frame and a side frame, and the opposite side frame (first side frame) through which the steel for PC stretched between the abut units passes. And the second side frame) are respectively formed with vertical slits. One or more vertical slits are provided in each side frame at a predetermined interval.

  The manufacturing apparatus of the present invention has a major object that the above-described vertical slit easily performs both the horizontal positioning and the vertical positioning of the steel for PC accommodated therein. First, lateral positioning (or lateral restraint) can be realized by setting the slit width of the longitudinal slit to a width comparable to that of the steel for PC. On the other hand, the vertical positioning of the PC steel material (for example, when a plurality of PC steel materials are accommodated in one vertical slit, each PC steel material is positioned at a predetermined level position in the vertical direction) It is performed by appropriate positioning and fixing means provided in.

  For example, the vertical slit formed in the first side frame is provided with the above-described positioning and fixing means, and the width of the vertical slit is more than the width of the steel for PC, and is formed in the second side frame. By setting the width of the vertical slit to be the same as the width of the steel for PC, it is possible to effectively position a predetermined number of the steel for PC by the first side frame and the second side frame. Become.

  A plurality of formwork units having the above-described configuration are provided, for example, each formwork unit is disposed so that the first side frame of an arbitrary formwork unit and the second side frame of the adjacent formwork unit face each other, By configuring the manufacturing equipment so that the PC steel material can be passed through the vertical slits of the first and second side frames of all the formwork units, the extension of the PC steel material spanned between the abut units has become longer. Even in this case, the steel for PC can be positioned at a predetermined position between the first and second side frames of each mold unit.

  In another embodiment of the apparatus for manufacturing a PC member according to the present invention, the positioning and fixing means includes a concave groove that communicates with the vertical slit and is formed on the side of the vertical slit.

  Although the embodiment of this positioning and fixing means has a very simple configuration, concave grooves corresponding to the number of PC steel materials are provided on the side of the vertical slit. For example, by setting the width of the vertical slit to be approximately the same as the width of the PC steel material, the PC steel material can be positioned and fixed in the vertical direction simply by fitting the vertical slit through each PC steel material into each groove. .

  Further, in another embodiment of the PC member manufacturing apparatus according to the present invention, the positioning and fixing means communicates with the vertical slit and is formed in a side of the vertical slit and accommodated in the concave groove. And a locking mechanism for locking the steel for PC.

  This embodiment of the positioning and fixing means is provided with a lock mechanism for locking the steel for PC accommodated in the concave groove in addition to the concave groove formed in the vertical slit described above. In the longitudinal slit having the positioning and fixing means, the width is set to be relatively larger than the width of the steel for PC, and the width of the longitudinal slit of the other side frame is set to about the width of the steel for PC. When it is done, the installation work of the steel material for PC becomes easy. In this case, even if the steel for PC is fitted in the groove of the vertical slit, the width of the vertical slit is set so that the PC steel is easily detached from the groove toward the vertical slit. obtain.

  Therefore, a predetermined number of concave grooves are provided in the vertical slit, and when the PC steel material is accommodated in the concave groove, the width of a part of the vertical slit is closed and the PC steel material falls from the concave groove to the vertical slit side. An appropriate lock mechanism for preventing this is provided.

  In addition, in a preferred embodiment of the PC member manufacturing apparatus according to the present invention, in the posture in which the steel material for PC is disposed in the vertical slit, the first side frame and the second side frame are respectively A closing member for closing the vertical slit is attached.

  By providing a vertical slit in the side frame, a concrete leakage portion at the time of filling concrete is formed in the vertical slit in a state in which the steel for PC is passed through the vertical slit. Therefore, an appropriate closing member is attached to the vertical slit for the purpose of closing the concrete leakage portion. As the closing member, for example, a sheet material or a face material having a notch portion that has an adhesive surface that can be bonded to the side wall and can easily pass the steel material for PC can be applied.

  Moreover, when the above-described closing member is attached to the inner side of the side frame, a recess according to the thickness of the closing member can be provided at a location where the closing member of the side frame is attached. By attaching the closing member to the recessed portion of the side frame, it is possible to prevent the stepped portion due to the closing member from being produced in the manufactured PC member. Further, when the salt damage countermeasure is applied to the end portion of the precast member, it is not necessary to provide the above-described recess portion inside the side frame in order to positively form a recess in the end surface of the molded precast member ( In this case, a depression corresponding to the thickness of the closing member is formed). A precast member is manufactured by applying an appropriate end treatment material to the recess formed in the end surface of the precast member, and finishing the surface.

  According to the PC member manufacturing apparatus of the present invention, it is possible to efficiently and accurately position the steel for PC in the vertical direction and the horizontal direction by using a plurality of the above-mentioned formwork units. Therefore, it is possible to ensure the quality of the manufactured PC member (PC member in which the steel for PC is disposed at a desired internal position) and improve the manufacturing yield.

  A PC member manufacturing method according to the present invention is a PC member manufacturing method for manufacturing two or more PC members each including a steel material for PC into which pre-stress is introduced by a pretension method, A plurality of mold units each including a first side frame and a second side frame, which are provided with vertical slits through which the steel for PC penetrates, are prepared. A first step of installing a plurality of the above-mentioned formwork units between the reaction force receiving side abuts receiving force, a predetermined number of steel for PC penetrate through the vertical slits of the side frames of each formwork unit, and , A second step of positioning and fixing the PC steel material on one side frame of each mold unit and passing the PC steel material between the abut units, and introducing tension to each PC steel material, And a third step of placing pre-stress in the concrete by placing concrete in the frame unit and releasing the tension when the concrete exhibits a predetermined strength. .

  Here, the PC steel material positioning and fixing method is such that the PC steel material is accommodated in the concave groove formed on the side of the vertical slit, and the PC steel material accommodated in the concave groove is locked. The method can be applied.

  In the second step described above, after the steel material for PC is positioned and fixed in the vertical slit, a closing member for closing the vertical slit is attached to the first side frame and the second side frame. It is desirable.

  As can be understood from the above description, according to the PC member manufacturing apparatus and manufacturing method of the present invention, the lateral positioning and the vertical positioning of the steel for PC are performed on the side frame of the mold unit constituting the manufacturing apparatus. Since the measures to be taken are taken, the steel for PC can be efficiently and accurately passed between all the formwork units, so that many high-quality PC members can be manufactured at a time.

  Embodiments of the present invention will be described below with reference to the drawings. 1 is a plan view of an embodiment of the manufacturing apparatus of the present invention, FIG. 2 is a view taken along the line II-II in FIG. 1, and FIG. 3 is an enlarged perspective view of a part of the manufacturing apparatus. Show. 4A and 4B are perspective views of the lock mechanism, FIG. 4A is a diagram illustrating a situation before the PC steel material is locked, and FIG. 4B is a diagram illustrating a situation where the PC steel material is locked. FIG. 5 is a schematic diagram for explaining the flow of arranging the steel for PC in the formwork unit, FIG. 5a is a side view thereof, FIG. 5b is a view taken along the line bb in FIG. 5a, and FIG. FIG. 6-8 is the figure explaining the flow which arrange | positions the steel material for PC following FIG. 5 in a formwork unit in order. FIG. 9 is a diagram illustrating a situation in which the blocking member is installed.

  FIG. 1 is a plan view of an embodiment of a PC member manufacturing apparatus, and FIG. 2 is a partial front view thereof. The manufacturing apparatus 100 includes a tension beam 53 to which one end of a steel material for PC 7 (PC steel wire, PC steel bar, etc.) is fixed, hydraulic jacks 52 and 52 that push and move the tension beam 53, and a reaction between the hydraulic jack 52 and the hydraulic jack 52. A tension side abutment composed of an abutment 51 which is a power platform, a reaction force receiving side abutment 54 to which the other end of the PC steel material 7 is fixed, and a predetermined number of mold units 10 installed between the two abutments, 10 is generally composed of.

  The mold unit 10 includes a steel bottom frame 4 and steel side frames that stand on the upper surface of the bottom frame 4 and surround four sides. This side frame is comprised from the side frames 1 and 2 provided with the vertical slit which the steel material 7 for PC spanned between two abuts penetrates, and the side frames 31 and 32 orthogonal to the side frames 1 and 2. The In the illustrated embodiment, 16 PC steel members 7, 7,... Are arranged in one direction in a plan view in one mold unit 10 (see FIG. 1), and three PC steel members in a side view. 7, 7, and 7 are disposed (see FIG. 2).

  As shown in FIG. 1, the steel material 7 for PC common to many formwork units 10,10, ... is arrange | positioned, and it is fixed and tensioned by the abutments 51 and 54 of both sides. After all the steel materials for PC 7 are tensioned, the concrete is filled into the respective mold units 10, 10,..., Waiting for the required strength to be developed, prestress is introduced into the concrete, and demolding work is performed. As a result, a large amount of PC members are manufactured at a time.

  FIG. 3 is an enlarged view of a part of the formwork unit 10, and is a diagram illustrating an embodiment of the positioning means for the PC steel material 7.

  A predetermined number of vertical slits 11 are provided in the side frame 1, and each vertical slit 11 is provided with a predetermined number of concave grooves 12, 12,. On the other hand, the other side frame 2 is also provided with a vertical slit 21 at a position facing the corresponding vertical slit 11, and a predetermined number of PC steel materials 7, 7,. Is done.

  First, the PC steel material 7 is laterally positioned by loosely fitting the PC steel material 7 into the corresponding vertical slits 11, 21. In particular, by setting the vertical slit width of the vertical slit 21 of the side frame 2 to be about the width of the PC steel material 7, the lateral positioning accuracy can be increased.

  On the other hand, the width of the vertical slit 11 of the side frame 1 is set to a relatively larger width than the PC steel material 7 so as not to hinder the work efficiency when the PC steel material 7 is loosely fitted. Is good.

  On the back side of the side frame 1 (outside opposite to the inside filled with concrete), for example, a steel pipe 13 shown in the figure is attached so as to be horizontally movable and rotatable around a shaft member 14 (the inner diameter of the steel pipe is the axis). By being larger than the dimension of the member, the horizontal movement and rotation of the steel pipe can be realized), and the lock mechanism is configured together with the rotating piece 16 that finally locks the grip 15 fixed to the steel pipe 13.

  4A and 4B are diagrams for explaining the operation mode of the lock mechanism. FIG. 4A illustrates a state before locking, and FIG. 4B illustrates a locked state. 4a, the PC steel materials 7, 7,... Are inserted into the longitudinal slit 11, and the PC steel materials 7, 7,. At this stage, the grip fixed to the steel pipe 13 is engaged in the horizontal groove 17a of the flat steel 17 on the side thereof.

  As shown in FIG. 4 b, when the PC steel material 7 is fitted in the concave groove 12, the grip 15 fixed to the steel pipe 13 is gripped to rotate the steel pipe 13 (X1 direction), and the concave groove 12. The grip 15 is locked by moving it slightly horizontally (X2 direction), engaging the grip 15 in the horizontal groove 18a of the other flat steel 18 and rotating the rotating piece 16 (X3 direction). 13 rotations and horizontal movements are restricted. The opening of the groove 12 is closed by the horizontal movement of the steel pipe 13, and the drop of the steel material 7 for PC 7 to the vertical slit side is prevented.

  A large number of mold units each having a locking mechanism and a side frame having a vertical slit are arranged between the abut units, and a steel material for PC is spanned between the abut units and arranged in each mold unit. By positioning and fixing, even when the extension of the steel for PC becomes long, the steel for PC can be positioned at a desired position of each mold unit. Therefore, in addition to manufacturing a large number of PC members at a time, it is possible to manufacture high-quality PC members.

  Next, the outline of the manufacturing process which arrange | positions three steps | paragraphs of steel materials for PC in each vertical slit between each formwork unit is demonstrated based on FIGS. In each figure, a figure shows a side view, b figure shows a front view seen from the side frame 1 side, and c figure shows a front view seen from the side frame 2 side.

  First, the lowermost PC steel material 7 is inserted into the vertical slits 11 and 21 of the side frames 1 and 2, and is fitted into the lowermost groove 12 (see FIG. 5). Next, the PC steel materials 7 and 7 at the top and the second section are sequentially inserted into the longitudinal slits 11 and 21, and are inserted into the grooves 12 and 12 at the top and the second section (see FIGS. 6 and 7).

  The above work is performed in all the formwork units 10, 10,..., The steel pipe 13 is locked, and all the PC steel materials 7, 7,. It is made to act | operate and a tension | tensile_strength is introduce | transduced into the steel materials 7,7, ... for PC (refer FIG. 8).

  By the way, after the tension is introduced into the steel materials for PC 7, 7,..., It is necessary to close the concrete leakage portion formed by the vertical slit before filling the mold unit with concrete. FIG. 9 is a diagram for explaining the state of installation of the blocking member.

  The closing member 6 is made of a plate material or sheet material having a predetermined strength and flexibility, and includes a hole 62 for the PC steel material 7 to enter, and a notch 61 for guiding the PC steel material 7 into the hole 62. ... is formed. In addition, one surface of the closing member 6 is an adhesive surface, and is configured so that the closing member 6 can be easily attached to the side frames 1 and 2.

  In the figure, a recessed portion 19 having the same thickness as that of the closing member 6 is formed at the attachment position of the closing member 6 of the side frame 1. By attaching the closing member 6 to the hollow portion 19, it is possible to prevent the PC member from being uneven by the closing member. Of course, the closing member 6 is also attached to the vertical slit portion of the other side frame 2. FIG. 3 shows a state in which the closing member 6 is installed on the side frame 2.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

It is a top view of one embodiment of a manufacturing device of the present invention. It is an II-II arrow line view of FIG. It is the perspective view which expanded a part of manufacturing apparatus. It is a perspective view of a lock mechanism, (a) is a figure explaining the situation before locking steel for PC, (b) is a figure explaining the situation where PC steel was locked. It is the schematic diagram explaining the flow which arrange | positions the steel material for PC to a formwork unit, Comprising: (a) is the side view, (b) is the bb arrow line view of (a), (c) is (a) It is a cc arrow line view of). It is the schematic diagram explaining the flow following FIG. 4, (a) is the side view, (b) is a bb arrow view of (a), (c) is a cc arrow view of (a). FIG. It is the schematic diagram explaining the flow following FIG. 5, (a) is the side view, (b) is the bb arrow view of (a), (c) is the cc arrow view of (a). FIG. It is the schematic diagram explaining the flow following FIG. 6, (a) is the side view, (b) is a bb arrow view of (a), (c) is a cc arrow view of (a). FIG. It is a figure explaining the condition which installs the closure member.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Side frame (1st side frame), 11 ... Vertical slit, 12 ... Groove, 13 ... Lock mechanism, 2 ... Side frame (2nd side frame), 21 ... Vertical slit, 31 ... Side frame (1st 3 side frame), 32 ... side frame (fourth side frame), 4 ... bottom frame, 51 ... tension side abutment, 52 ... hydraulic jack, 53 ... tension beam, 54 ... reaction force receiving side abutment, 6 ... occlusion Member: 7 ... Steel material for PC, 10 ... Formwork unit, 100 ... Manufacturing equipment

Claims (6)

A PC member manufacturing apparatus for manufacturing a PC member provided with a steel for PC into which prestress is introduced by a pretension method,
The PC member manufacturing apparatus includes an abut unit including a tension-side abutment and a reaction force receiving-side abutment that receives a reaction force when a tension force is introduced.
One or more formwork units disposed between the abut units,
The mold unit includes at least a bottom frame, a first side frame and a second side frame which are opposed to each other while the steel material for PC passes therethrough,
Longitudinal slits are respectively formed at corresponding positions of the first side frame and the second side frame,
Either one of the vertical slits is provided with positioning and fixing means for positioning and fixing the steel for PC. The positioning and fixing means communicates with the vertical slit and has a plurality of recesses formed on the side of the vertical slit. Consisting of grooves,
The PC member manufacturing apparatus according to claim 1, wherein the PC steel material is positioned in the horizontal direction by the vertical slit, and the PC steel material is positioned in the vertical direction by the plurality of concave grooves . 2. The PC member manufacturing apparatus according to claim 1, wherein the positioning and fixing means includes the concave groove and a lock mechanism that locks the steel for PC accommodated in the concave groove . In the posture in which a plurality of steel materials for PC are disposed in the vertical slit, the first side frame and the second side frame are each provided with a closing member for closing the vertical slit. The apparatus for manufacturing a PC member according to claim 1 or 2. The said closing member is attached inside a side frame, The hollow part according to the thickness of the closing member is provided in the location where the closing member of this side frame is attached. Item 4. The PC member manufacturing apparatus according to Item 3. A PC member manufacturing method for manufacturing two or more PC members each having a PC steel material to which prestress is introduced by a pretension method,
A plurality of mold units each including at least a first side frame and a second side frame, which are provided with a bottom frame and a vertical slit through which a steel material for PC penetrates, are prepared. A first step of installing a plurality of the formwork units between a reaction force receiving side abut receiving a reaction force of time,
A predetermined number of PC steel materials are passed through the vertical slits of the side frames of each mold unit, and the PC steel materials are positioned and fixed to one side frame of each mold unit so that the PC steel material is placed between the abut units. A second step over to
Introduce prestress into concrete by introducing tension to each steel for PC, placing concrete in each formwork unit, releasing the tension when the concrete develops a predetermined strength 3 processes,
The positioning and fixing method of the steel for PC is such that the steel for PC is accommodated in a plurality of concave grooves formed on the side of the vertical slit, and the PC steel accommodated in the concave groove is locked. A method for producing a PC member, which is a method. After the PC steel material is positioned and fixed in the vertical slit in the second step, the first side frame and the second side frame are each provided with a closing member for closing the vertical slit. The manufacturing method of the PC member of Claim 5.

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