JPH05293814A - Casting method of precast concrete beam and interposing jig for casting - Google Patents

Abstract

PURPOSE:To enhance productivity and reduce production cost by a method wherein efficient manufacturing can be possible with simple interposing jigs in very narrow casting space. CONSTITUTION:Form zones of a plurality of beams are disposed in an array at close intervals. Further, proper number of interposing jigs 6 are arranged at each interval part. In alternate form zones, precast concrete beams A are cast in advance. In the other alternate form zone, casting forms B to be performed next time are arranged so as to be supported through the interposing jigs by the previously cast precast concrete beams. After concrete is cast in the respective casting frames B are hardened, the respective interposing jigs are separated and the previously cast precast concrete beams are carried out. Next, in the alternate form zones, out of which the beams are carried, similarly precast concrete beams are cast and, at the same time, similarly the respective previously cast precast concrete beams are carried out. By repeating the procedure as mentioned above, casting are alternately performed in alternate form zones and the resultant beams are carried out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a precast concrete beam which is a finished product or a semi-finished product, and an interposing jig for the construction.

[0002]

2. Description of the Related Art Precast concrete beams, which are finished products or semi-finished products manufactured by using a driving formwork, are already known in factories, on-site sites and the like. However, since the supporting means suitable for the beam back is required for its manufacturing, a considerable space is required for one beam, and a large number of simultaneous constructions require a large yard and work floor. It has stopped working. In addition, since it is necessary to assemble and dismantle the supporting means each time it is manufactured, it takes a lot of time and labor. Therefore, the productivity is poor and the cost is high.

[0003]

SUMMARY OF THE INVENTION In view of the above points, the present invention is capable of efficiently manufacturing in a very small construction space and with a simple construction intervening jig to improve productivity and reduce costs. Is to reduce.

[0004]

In order to achieve the above object, the construction method of the precast concrete beam according to claim 1 is as follows:
In the method of constructing a precast concrete beam using a driving form that fits the outer shape of the beam, form zones of each of the above-mentioned driving forms are installed side by side at a slight interval in the yard, and are suitable for each interval. Number of intervening jigs are arranged, precast concrete beams are pre-constructed in one of the mold form zones in the mold form zone, and the driving formwork to be constructed next time is arranged in the other mold form zone. Then, these driving forms are supported by the precast concrete beams of the previous construction through the intervening jigs, and after the concrete is placed and cured in these driving forms, the intervening jigs are separated from each other. Then, carry out the precast concrete beam of the previous construction, then construct the precast concrete beam in the same way in one of the separated formwork zones after carrying it out, and in the same way. It carries the respective precast concrete beam of the previous construction, characterized by construction unloaded alternately every 隔型 frame zone by repeating this. In addition, the interposition jig for construction of the precast concrete beam according to claim 2 is provided in the interval portion of each form frame zone of a plurality of driving forms adapted to the outer shape of the beams juxtaposed at a small interval. A base plate to be fixed to the space is provided, and the base plate can be horizontally rotated and the width of the space can be expanded or reduced with the horizontal rotation. The columnar cam member is erected.

[0005]

With the above construction, in the method for constructing a precast concrete beam according to claim 1, the precast concrete beam that has been constructed in advance serves as a supporting means and uses an intervening jig. Useless conventional support means for assembling and disassembling. Further, in the interposing jig for constructing the precast concrete beam according to claim 2, it is used as an intervening jig according to the constructing method according to claim 1 in the interval portion of each form frame zone, and a columnar cam is used. By rotating the members and widening them to the width of the gap, if mechanically intervening between the precast concrete beam of the preceding construction and the driving form of the precast concrete beam to be constructed next time, the next construction It becomes the support means of the driving form of
If the columnar cam member is rotated to reduce the width to a width narrower than the width of the gap, the precast concrete beam of the previous construction is carried out, and the post-casting formwork to the formwork zone after the carry-out is carried out. Can be inserted.

[0006]

The drawings show an embodiment of the invention. Figure 1
As shown in, a concrete work floor 2 is formed by striking earth concrete in a yard 1 such as a site site, a plurality of joists 3 made of H-shaped steel are arranged on the work floor, and on these joists, A plurality of formwork zones 5 forming orthogonal directions are made parallel to each other with a slight gap portion 4, and an intervening jig 6 is provided on each joist 3 at each gap portion. Intervening jig 6
As shown in FIGS. 5 to 7, a base plate 61 having a length that fits the width of the joist 3 and an appropriate width that can be accommodated in the width of the spacing portion 4 is provided. The leg plate 62 is welded to the portion to hold a space in the middle portion, and the rotating plate 63 is arranged in the middle portion of the upper surface, and a through hole communicating with the center of both is bored to insert the bolt 64, And washer 69
, The nut 65 is screwed, and the rotary plate 63 is horizontally rotatably mounted on the rotary plate 63. The rotary plate 63 has an elliptical cross-sectional shape, the major axis of which fits the spacing portion 4, and the minor axis of which is short. A columnar cam member 66 of a steel pipe, which is sufficiently smaller than the gap portion and is sufficiently higher than the back of the beam to be manufactured, is welded concentrically with the bolt 64 to stand upright, and a horizontal hole is formed in the upper end portion of the columnar cam member. 67 is formed, and the operating rod 68 is detachably inserted into the lateral hole. The bolt 64 and the nut 65 screwed onto the bolt 64 are simply welded to prevent unscrewing, and grease is injected into the rotating portion. As shown in FIGS. 5 and 6, the intervening jig 6 thus configured is fastened to the flange of the joist 3 by the fastening hardware 7 at both ends of the base plate 61.

The production of precast concrete beams is carried out in the following procedure. It will be described in order with reference to FIG. In this case, a semi-finished precast concrete beam is manufactured. First, as shown in FIG.
, The beam driving molds 8 each consisting of the beam bottom and the beam side are arranged, the steel frame 9 is arranged in each driving mold, and the required reinforcing bars 10 are provided, and the separators 11 are appropriately inserted at each place. Then, the support means 12 composed of a fastener, a washer, a single pipe or the like is connected to the separators on the outside of the formwork, and concrete 13 is placed in each driving formwork 8. When a predetermined concrete strength is developed in the cast concrete 13, the supporting means 12 is dismantled and removed to manufacture the first precast concrete beam A. The separator 11 and the support means 12 are no longer necessary. At this time, the intervening jig 6 may not be installed, but it needs to be installed before the next process. In the figure, 15 and 16 are spacers. Next, as shown in FIGS. 4 and 5, the columnar cam member 66 of each of the intervening jigs 6 installed is placed in the other mold frame zone 5 with the minor axis direction directed toward the width direction of the spacing portion 4. Similarly to the previous time, the beam driving molds 8 composed of the beam bottom and the beam side are arranged, the steel frames 9 are arranged in each driving mold, and the required bar arrangements 10 are made. By inserting the operation rod 68 into the lateral hole 67 and horizontally rotating each columnar cam member 66 by 90 degrees with the operation rod, the major axis direction of each columnar cam member is directed to the width direction of the spacing portion 4, and Mechanically intervening between each of the driving forms of this time, and fitting the support bar 14 bent in a U shape between the inner surface of the beam side of each of the driving forms 8 of this time and each of the columnar cam members 66. , Each driving form 8 this time, the first precast concrete beam A, each columnar cam member 66 and each supporting rod
14 and support. Concrete 13 is placed in each of the casting forms 8 of this time, and the support rods 14 are pulled out immediately after the casting to manufacture the precast concrete beam B of this time. When a predetermined concrete strength is developed in the post-cast precast concrete beam B, the columnar cam members 66 are horizontally rotated by 90 degrees by the operation rod 68, so that the columnar cam members are moved in the direction of the minor axis of the spacing portion 4. In the width direction,
The columnar cam members 66 are separated from the precast concrete beams A and B, which are precast and postcast, and the precast concrete beam A, which is precast, is carried out. In one of the separated formwork zones 5 that has been carried out, again, beam driving molds 8 composed of a beam bottom and a beam side are arranged respectively, and a steel frame 9 is arranged in each driving mold, and a required reinforcing bar 10 is arranged. Then, the columnar cam members 66 are horizontally rotated by 90 degrees with the operating rod 68 so that the major axis direction is directed in the width direction of the spacing portion 4 and the machine is inserted between the last and present driving frames. The support rod 14 bent in a U-shape between the inner surface of the beam side of each driving form 8 and each columnar cam member 66,
Each driving form 8 of this time is supported by the precast concrete beam B of the previous time, each columnar cam member 66, and each supporting rod 14. Concrete 13 is poured into each of the driving forms 8 of this time as in the previous time, and each support rod 14 is pulled out immediately after the driving,
The precast concrete beam C this time is manufactured. When a predetermined concrete strength is developed in the post-cast precast concrete beam C, the columnar cam members 66 are horizontally rotated by 90 degrees by the operating rod 68, so that the columnar cam members are moved in the direction of the minor axis of the spacing portion 4. In the width direction,
The columnar cam members 66 are separated from the precast concrete beams B and C, which are precast and postcast, and the precast concrete beam B, which is precast, is unloaded. After that, these operations are repeated, and the construction is carried out alternately for each of the remote mold zones and carried out.

FIGS. 8 and 9 show another example of the interposition jig 6. In this case, instead of the columnar cam member 66 having an elliptical cross section in the previous example, a square cam member 66 is used, and the horizontal rotation of 45 degrees causes the width to be widened and narrowed in a relationship of √2: 1.

In the above-mentioned embodiment, the description of the weir plate at the beam end is omitted, but a conventional ordinary one may be used, such as plywood, steel, punching metal, etc. An implantable type may be used. Further, the weir board at the beam end and the steel frame 9 may be supported by a jig attached to the joist 3 at the beam end. Attaching a suspension ring made of steel bars to each precast concrete beam is convenient for carrying out. The driving form 8 shown in FIGS. 3 to 5 is formed by connecting a plurality of weir plates for planes, corners and the like. These weir plates are extruded cement boards and are made of hydraulic inorganic material. A binder, an inorganic or organic fiber, another aggregate and water are mixed, and this is sent to an extrusion molding machine and extruded at high pressure.

[0010]

According to the method for constructing a precast concrete beam of claim 1, the precast concrete beam that has been constructed in advance also serves as a supporting means, and almost no supporting means is required other than using an intervening jig. The time and labor for assembling and dismantling the supporting means can be eliminated, and a small gap required for the intervening jigs can be provided between each form zone, so the invalid space can be minimized. Therefore, it is possible to efficiently manufacture a large amount in a small space, so that productivity can be improved and cost can be reduced. Further, according to the interposing jig for constructing the precast concrete beam as claimed in claim 2, in the construction method, the columnar cam member is used for the space portion of each form zone, and the columnar cam member is rotationally widened to the width of the space portion. By interposing it between the precast concrete beam of the preceding construction and the driving form of the precast concrete beam to be constructed next time, the reaction force is applied to the precast concrete beam of the preceding construction to support the driving form of the next construction. In addition, the supporting means can be released by simply rotating the columnar cam member to reduce the width to a width narrower than the width of the interval portion, and the precast concrete beam of the previous construction. It is possible to carry out and to insert the post-driving formwork into the formwork zone after the carry-out, thus eliminating the conventional support means for assembling and disassembling each time. Not only can its operation, handling can be done very easily and quickly with only a slight rotation.

[Brief description of drawings]

FIG. 1 is a plan view showing the construction of a yard according to an embodiment of the present invention.

FIG. 2 is a cutaway front view illustrating the manufacturing process of the example.

FIG. 3 is a partially enlarged cutaway front view of a first step of FIG.

FIG. 4 is a partially enlarged sectional front view of a second step of FIG.

5 is a partially enlarged plan view showing a further enlarged plane of a main part in the second step of FIG. 2. FIG.

FIG. 6 is a partially enlarged cutaway side view showing an enlarged main part of the intervening jig of the same example.

FIG. 7 is an enlarged perspective view of the intervening jig and the like.

FIG. 8 is an enlarged cutaway side view showing another example of the interposition jig.

FIG. 9 is an enlarged plan view of the intervening jig.

[Explanation of symbols]

 1 yard 2 working floor 3 joist 4 spacing 5 formwork zone 6 interposition jig 7 tightening hardware 8 driving formwork 9 steel frame 10 bar arrangement 11 separator 12 support means 13 concrete 14 support rod 15 spacer 16 spacer 61 base plate 62 leg plate 63 Rotating plate 64 Bolt 65 Nut 66 Columnar cam member 67 Horizontal hole 68 Operation rod 69 Washer A Precast concrete beam B Precast concrete beam C Precast concrete beam

Claims (2)

[Claims] 1. A method of constructing a precast concrete beam using a driving form adapted to the outer shape of a beam, in which a plurality of the forming zones of the driving forms are arranged side by side in a yard at a slight interval. Arranging an appropriate number of intervening jigs in each interval, of the formwork zones, pre-construction of precast concrete beams in one of the formwork zones, and in the other formwork zone each next Placing the driving form, supporting these driving forms on the precast concrete beam of the previous construction through the intervening jig, and
After placing concrete in these driving forms and hardening them, the intervening jigs are separated and the precast concrete beam of the previous construction is carried out, and then the same is done in one of the separating form zones after carrying out. The precast concrete beam construction method is characterized in that the precast concrete beam is carried out in the same manner as before, and each precast concrete beam of the previous construction is carried out in the same manner, and the precast concrete beam is carried out alternately for each formwork zone by repeating this. .. 2. A base plate is provided which is fixed to the space of each form frame zone of a plurality of driving forms adapted to the contours of beams arranged side by side at a slight interval, and is horizontally rotatable from the base plate. An intervening jig for constructing a precast concrete beam, characterized in that a columnar cam member capable of switching between widening the width of the spacing and narrowing the width narrower with the horizontal rotation is erected. ..