JPH08118337A - Movable form for precast concrete member - Google Patents

Abstract

PURPOSE: To provide a form capable of corresponding to the cross sections of precast beams having various dimensions. CONSTITUTION: A movable form is equipped with side frames 10, the slide operation part 20 placed and fixed on a form bed 2 to enable the movement of the side frames 10 in a beam width direction, the reinforcing frames fixed to the slide operation part 20 and reinforcing the side frames 10, the side frame running rollers 30 fixed to the lower ends of the side frames 10 to support the movement of the side frames 10 due to the slide operation part 20 and the lift means 53 provided between the side frames 10 provided at opposed positions and capable of holding a bottom form 50 at a predetermined position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a movable formwork for a precast concrete member, and particularly for a precast concrete member which can be quickly and accurately applied to various beam dimensions and which allows easy maintenance of the inner surface of the formwork. Regarding movable formwork.

[0002]

2. Description of the Related Art In recent years, in construction structures, rationalization of construction,
For the purpose of shortening the construction period and reducing costs, the prefabrication of structural members has been advanced. Among them, in the precast reinforced concrete structure in which structural members such as beams and walls are prefabricated, precast beams and precast boards are manufactured in advance in the prefab factory or on-site, assembled at the site, and joined to construct the whole frame structure. There is. In addition, various composite structures have been developed, such as a synthetic slab structure, in which a precast plate is used as a formwork and a slab is cast by cast-in-place concrete to integrate with a beam or a wall.

12 and 13 are a front view and a side view showing an example of a mold for producing a precast beam. As shown in FIG. 12, the side frame 101 of the beam form 100 is fixed on the bed 102 by the fixing bolts 103 and the positioning pins 104 with the lower end separated by a distance equal to the width B of the beam (not shown). . Further, the U-shaped yoke member 105 having an open end downward is provided on the side frame 10 at the time of placing concrete.
1 are attached at a predetermined interval in the longitudinal direction of the beam so as to restrain the deformation of No. 1 (see FIG. 13). In this yoke member 105, a stirrup guide member 107 is fixed to a predetermined position of a horizontal member 106, and as shown in the figure, a protruding portion 110a of a stirrup 110 arranged in the beam by the stirrup guide member 107. By supporting a rod-shaped star wrap suspender 108 that suspends the rod, the stirrup 110 having the beam reinforcement can be held in position in the form with a predetermined covering.

[0004]

By the way, since buildings in recent years are diversified in shape and the like, beam members are required to have various sizes and shapes. For this reason, when the precast beam formwork as described above is used, the following problems occur. (1) In the case where the beam is changed, the side frame part must be modified to provide an accessory formwork of a predetermined size in the vertical position of the side frame. Therefore, additional work for modifying the formwork is required, and the cost for modifying the formwork is also increased, which leads to an increase in the construction cost. Also, since the additional formwork is added, a seam portion appears on the surface of the beam, which deteriorates the product quality. (2) Heavy machinery on site, such as an overhead crane in the factory, must be used to set the formwork, making delicate positioning adjustment difficult. For this reason, it takes time to attach the positioning pin and the fixing bolt. (3) Since the fixing bolts and the positioning pins at the lower end of the side frame are removed at the time of demolding, the side plate is no longer supported and the side frame may fall down. Further, since the side frame is sandwiched by the yokes, the bottom surface of the side frame cannot be cleaned. For this reason, it is necessary to remove the yoke and clean the side frame away from the beam surface with a gap, and it takes time to assemble the formwork for the next concrete placement and There is a drawback that it takes time to assemble the frame.

Therefore, the object of the present invention is to solve the above-mentioned problems of the prior art, to facilitate the maintenance of the mold, and to quickly and accurately adjust the mold size according to the size of the precast beam of various sizes. It is to provide a movable formwork for a precast concrete member that can be set.

[0006]

In order to achieve the above-mentioned object, the present invention provides a side frame, a slide operation portion fixedly mounted on a formwork bed and movable in the beam width direction, and A stiffening frame fixed to the slide operation part to stiffen the side frame, a side frame traveling roller fixed to the lower end of the side frame to assist the movement of the side frame by the slide operation part, and the side frame at the opposite position. It is characterized by comprising an elevating means provided between the side frames and capable of holding the bottom mold at a predetermined position.

At this time, in the slide operation portion, the screw rod is rotatably supported by the block bearing, and when the screw rod is rotated, the nut portion in a screwed state is fixed to the screw rod in a state in which the rotation is suppressed. It is preferable to move along the beam width direction.

Further, it is preferable that the elevating means is a jack for vertically elevating the bottom mold by rotating a screw rod.

[0009]

According to the present invention, a slide operation section capable of moving a side frame in the beam width direction is placed and fixed on a mold bed, and the slide operation section further stiffens the side frame. In addition to fixing the frame, a side frame running roller that assists the movement of the side frame by the slide operation portion is fixed to the lower end of the side frame, and the bottom formwork is held at a predetermined position between the side frames at the opposing positions. Since the possible elevating means is provided, the dimensions can be set quickly and accurately with respect to a predetermined beam cross-sectional dimension, and the cleaning after the mold is removed from the mold can be easily performed by the lifting and lowering operations of the bottom mold and the side frames.

At this time, in the slide operation portion, the screw rod is rotatably supported by the block bearing, and when the screw rod is rotated, the nut portion in the screwed state is fixed to the screw rod in a state in which the rotation is suppressed. By moving the side frame in the beam width direction along the beam width direction, the side frame can be moved and positioned in the beam width direction quickly and accurately with a simple structure.

Further, the elevating means uses a mechanism for elevating the bottom mold up and down by the rotation of the screw rod, so that the vertical movement of the bottom mold can be performed easily, quickly and accurately.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a movable mold for precast concrete members according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing an example applied as a formwork of a precast beam as an embodiment of the present invention. In FIG. 1, the side frame 10 of the movable mold 1 is substantially the same as the side frame 10 of the conventional mold, and a face plate 11 made of a horizontally long steel plate as shown in FIG. It is reinforced with a rib member made of steel 13 (angle material), and is a slide operation unit 20 installed at a lower end of the side frame 10 at a predetermined interval, and a traveling roller unit 30 traveling on a rail 34 fixed on the bed 2. It is slidably supported by. Needless to say, the rib member may have a structure of a reinforcing member other than the above as long as the rib frame strength can be obtained.

Further, in order to maintain the state in which the side frame 10 is erected, a pillar 41 is erected at the position of the slide operation portion 20. The column 41 is erected on the slide operation unit 20, and together with the lower end of the side frame 10 and the horizontal beam 42, forms a stiffening stiffening frame 40. Then, the upper portion of the side frame 10 and the upper portion of the side frame 10 via the tilt adjusting bolts 44 attached to the tip of the stiffening plate 43 at the upper end position of the column 41.
The bearing block 14 provided at the lower end of the above forms the horizontal beam 42 and the pin joint structure 15.

Here, the structure of the slide operation portion 20 will be described with reference to FIGS. 1, 3 and 4. The slide operation part 20 is mounted and fixed on a rail bottom plate 21 bolted to a predetermined position of the form bed 2,
A traveling guide 22 assembled in an elongated rectangular shape when viewed from above and a guide block 2 at both ends of the traveling guide 22.
The screw rod 24 formed with a square screw, the traveling nut screwed into the screw rod 24, and the longitudinal guide block 26 of the traveling guide 22 are slidably contacted on both sides over the entire length axially supported by the support hole of the traveling guide 3. A traveling nut 25 is sandwiched and fixed to the lower end thereof, and a traveling block 27 supporting the stiffening frame 40 at the upper end thereof. In the slide operation unit 20 configured as described above, the slide operation unit 2
When the rotary handle 28 attached to the tip of the screw rod 24 of 0 is rotated clockwise (clockwise screw rotation direction), the traveling nut 25 tries to rotate together with the rotation of the screw rod 24, but the traveling nut 25 is welded. The travel block 27 is prevented from rotating at the sliding contact surface position of the longitudinal guide block, and as a result, the travel block 27 moves in the arrow A direction. As a result, the stiffening frame 40 supported by the traveling block 27 also moves, and the entire side frame 10 also moves in the direction of arrow A.

Now, the assembled state of the slide operation portion 20 will be described with reference to FIG. As shown in the figure, the threaded rod 24 has a rod portion 24a having no thread formed therein and is axially supported by a support hole formed in the guide blocks 23 at both ends. A rotary handle 28 is fixed to the. A traveling block 27 having a substantially rectangular parallelepiped shape is welded to the upper surface of the traveling nut 25. The horizontal beam 42 of the stiffening frame 40 is screwed to the upper surface of the traveling block 27 by the fixing bolt B via the support plate 29.

At this time, in order to smoothly perform the sliding movement of the side frame 10, a traveling roller 30 as shown in FIGS. 1, 3 and 5 is provided at the lower end of the side frame 10. A wheel 32 is axially supported by a bearing portion 31 fixed to a bottom surface portion of the side frame 10 of the traveling roller 30, and a V-shaped groove 33 is formed on a traveling surface of the wheel 32. The V-shaped groove portion 33 engages with a mountain-shaped rail 34 fixed to the bed 2 and having an inverted V-shaped cross section to ensure the traveling of the wheels 32. The slide operation unit 20 and the traveling roller 30
And are arranged in a positional relationship as shown in FIG.

Further, as shown in FIGS. 1 and 6, a bottom mold 50 is installed at the lower end portions of the two side frames 10 facing each other. An upper portion of the bottom frame 50 is configured to support the bottom plate 52 with a bottom plate receiving plate 51 made of a steel plate, and further, an elevating jack 53 is provided to support the bottom plate receiving plate 51 so as to be vertically movable. . As shown in FIGS. 1 and 6, the lifting jack 53 is mounted and fixed on the support plate 5 which is hung over the central groove position of the bed 2. As the drive mechanism, as shown in the figure, the operation rod 54 is rotated in a predetermined rotation direction to move the screw rod 55 housed in the jack main body in the vertical direction. For example, as shown in FIG. 6, by rotating the operating rod 54 clockwise, the bottom plate receiving plate 51 and the bottom plate 52 can be pushed up in the direction of arrow B (upward).
At this time, the dust-proof cover 56 that expands and contracts as the rod moves so that the mortar component of the concrete cast in the mold does not adhere to the surface of the screw rod 55.
It is attached to the exposed part of. Further, at the lower end portion of the bed 2, the screw rod portion is housed in a vinyl chloride pipe. The slide operation unit 20 and the lifting jack 53
Obviously, a hydraulic jack may be used instead of the mechanical jack as described above.

On the other hand, as shown in FIG. 1, the beam reinforcement 60 is accommodated in the form frame in the state of being assembled in the form of a reinforcing bar block, and the spacer 6 is provided to secure the covering at the bottom position.
1 is set on the bottom plate 52. Further, the right side frame 10 in the drawing is shown as being slightly separated from the bottom plate 52 for the sake of explanation. Similarly, the vertical streaks may be supported by a spacer (not shown) provided between the side frame and the side frame in order to prevent the lateral shift in the form.

Here, the structure of the entire formwork for producing the precast beam will be described with reference to FIG. The figure shows a formwork for manufacturing an example of the precast beam, but in the case of other formworks, the traveling roller unit 30,
It suffices to appropriately set the arrangement position and the number of the slide operation parts 20, and it can be said that the structure of the movable formwork according to the present invention shows substantially the same structure as that shown in FIG. 2 even if the shape of the precast beam changes. . In FIG. 2, two sets of movable molds are linearly arranged side by side, the slide operation part 20 and the traveling roller are arranged at both end portions of the side frame 10 in the longitudinal direction, and the bottom mold 50 having the entire span of the beam 50. Is supported by four lifting jacks 53. Further, a gable form 70 made of a steel plate is installed at the end girders at both ends of the beam, and a joint streak (not shown) can be extended from a predetermined position of the gable form 70.

Since the movable formwork according to the present invention has the structure as described above, the positions of the side frames 10 and the bottom plate can be adjusted easily and accurately according to the beam width, beam width, etc. of the precast beam to be manufactured. It is possible to assemble a formwork of a predetermined size. At this time, concrete is manufactured at a batcher plant in the factory, loaded into a bucket, and the bucket containing concrete is moved to the formwork position by an overhead crane or the like to place the concrete in the formwork in a predetermined placement order. preferable. It is preferable to use a plurality of rod-shaped high frequency vibrators for compaction. Further, a plate vibration vibrator may be attached to a predetermined position of the side frame 10 for use.

Next, the bottom mold 50 of the movable mold according to the present invention.
Another embodiment will be described with reference to FIGS. 7 to 11. In the movable formwork shown in FIG. 1, the bottom plate 52 having a size corresponding to the beam width is installed by dropping it on the bottom plate receiving plate 51. Therefore, in this embodiment, two small jacks 5 that can be laterally extended to the upper end of the lifting jack 5 are used.
8 is attached and the rod 58a of the small jack 58 is extended so that the width of the bottom plate 52 can be increased according to the set beam width. At this time, a joint plate 59 having a predetermined width may be fitted in the gap portion generated by the widening of the bottom plate. Further, in order to prevent leakage of the mortar component from the projecting corner portion where the side frame 10 and the bottom plate 52 are in contact with each other, it is preferable that the blocking sheet S is stretched around the inner surface of the mold. At this time, it is preferable that the blocking sheet S at the projected corner portion is arranged so that the two sheets come into close contact with each other via the spreading roller group 75 installed below the bottom plate as shown in FIG. 7. As a result, it is possible to maintain the right angle accuracy of the projected corner portion of the beam.

FIG. 8 shows an example of application as a pillar formwork in which two bottom formwork 50 shown in FIG. 7 are erected in a state of facing each other and the side frame 10 is applied to both ends thereof. It is a thing. In this case, it is preferable that the concrete is pressure-fed from below the standing mold to fill the mold.

FIG. 9 shows an example of a movable formwork in which the beam width of the precast beam can be changed in the vertical position. As shown in the figure, the tilt adjusting rod 44 at the upper end position of the stiffening frame 40 supporting the side frame 10 of the movable mold and the side frame 10 have a pin joint structure 45, and further the tip of the horizontal beam 42 and the side frame. 10 The joint portion with the lower end is similarly pin-joint structure 46
Therefore, the beam width B1 at the upper end of the beam can be arbitrarily set by setting the rod length of the tilt adjusting rod 44 to a predetermined length, and the beam width B2 at the lower end can be set by the width of the bottom plate 52 to be installed. It is possible to manufacture a precast beam whose beam width changes uniformly.

FIG. 10 (a) shows an example of a movable form which can change the beam beam uniformly from h1 to h2. As shown in the figure, the upper end portion of the lifting jack 53 that supports the bottom plate 52 of the movable form has a pin joint structure 53a, and the rod extension amount of each jack 53 is changed uniformly so that a beam with a predetermined slope is formed. A precast beam consisting of can be manufactured. Further, as shown in FIG. 3B, the hinge 5 is attached to the bottom plate portion corresponding to the specified haunch length from the beam end.
It is also possible to manufacture a beam with a haunch by providing 2a and adjusting the rod stroke of the lifting jack 53.

FIG. 11 shows an example in which the side frames 10 at the opposing positions are evenly moved in the width direction by one driving means. The pantograph structure shown in the end portion of the side frames 10 is shown in FIG. This is a modified example in which the rod is joined with a pin and a jack showing a predetermined amount of expansion and contraction in both directions is attached to a part of the rod. According to this example, there is an advantage that the operations of changing the positions of the side frames 10 can be performed all at once on both sides of the two side frames 10 while taking timing respectively.

As is clear from the above description, according to the present invention, the beam width and the beam width can be changed easily and with high precision, so that an accurate formwork can be quickly prepared according to the size of a predetermined precast beam. In addition to being easily assembled, maintenance such as cleaning of the inner surface of the form becomes extremely easy, and it is possible to easily deal with complicated molding designs on the side and bottom of the beam, shortening the process, reducing the cost of manufacturing members, etc. It is possible to achieve various effects.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a movable formwork for a precast concrete member according to the present invention.

FIG. 2 is a plan view and a front view showing an example of a movable formwork for a precast concrete member according to the present invention.

FIG. 3 is a partially enlarged perspective view showing a slide operation portion and a traveling roller portion of the movable formwork for the precast concrete member shown in FIG.

FIG. 4 is a partially enlarged cross-sectional view showing the configuration of a slide operation portion.

FIG. 5 is a partially enlarged sectional view showing the configuration of a traveling roller.

FIG. 6 is a partially enlarged cross-sectional view showing the configuration of a lifting jack.

FIG. 7 is a partially enlarged view showing another embodiment of the bottom plate formwork.

8 is a partially enlarged view showing a modification of the bottom plate form shown in FIG.

FIG. 9 is a schematic side view showing an example of a movable form having a side frame structure whose beam width can be changed.

FIG. 10 is a schematic front view showing an example of a movable form of a beam whose beam width is uniformly changed.

FIG. 11 is a schematic side view showing an example of a movable formwork having a side frame structure configured to obtain a uniform beam width change amount.

FIG. 12 is a side view showing an example of a conventional formwork for manufacturing a precast beam.

13 is a front view showing a configuration of a side frame of the mold shown in FIG.

[Explanation of symbols]

 1 Movable Formwork 2 Formwork Bed 10 Side Frame 20 Slide Operation Section 22 Travel Guide 27 Traveling Block 30 Traveling Roller Section 40 Stiffening Frame 50 Bottom Formwork 52 Bottom Plate 53 Elevating Jack

Claims (3)

[Claims] 1. A side frame, a slide operation part mounted and fixed on a mold bed and capable of moving the side frame in the beam width direction, and an auxiliary member fixed to the slide operation part for stiffening the side frame. It is provided between a rigid frame, a side frame running roller that is fixed to the lower end of the side frame and assists the movement of the side frame by the slide operation part, and the side frame at the facing position, and the bottom formwork is positioned at a predetermined position. A movable formwork for a precast concrete member, which is provided with a lifting means capable of being held. 2. The slide operating portion has a screw rod rotatably supported by a block bearing, and when the screw rod is rotated, a nut portion in a screwed state is fixed to the screw rod in a state in which the rotation is suppressed. The movable formwork for a precast concrete member according to claim 1, wherein the movable formwork moves along the beam width direction. 3. The movable formwork for a precast concrete member according to claim 1, wherein the elevating means is a jack that moves up and down the bottom formwork by rotating a screw rod.