JPH0653107U - Inner mold attachment / detachment device for tubular concrete secondary products - Google Patents

Abstract

(57) [Summary] [Purpose] Since the drawing jig is inserted into the inner mold and then pulled out while being lifted, it is easy to balance and easily remove the mold without requiring skill. [Structure] Left and right inner mold members 2b to 2f forming the inner mold 2
Is connected to the rotary shafts 7a and 7b via a connecting plate 14 in a rotatable manner to provide a movable mechanism for adjusting the lateral width of the inner mold member. In the mold that is detachably attached to the shaft, hook mounting holes 11 are formed in the shaft supporting portions 8 that support both ends of the rotating shafts 7a and 7b, and the upper horizontal member of the U-shaped extraction jig 15 is formed. The hanging hook 16 is attached to the lower horizontal member 15a, and the hooks 17 are attached to the bottom surface of the lower horizontal member 15b corresponding to the shaft support portions 8 of the inner mold 2 so that the lower horizontal member 15b is attached to one end side of the inner mold 2. It is characterized in that the hook is hooked into the hook mounting hole 11 by inserting the hook from the inside, and the entire inner mold is lifted to be pulled laterally from the inside of the molded product.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for attaching and detaching an inner mold to an outer mold of a concrete formwork for molding a secondary product of a tubular concrete such as a box culvert.

[0002]

[Prior art]

 Generally, concrete molds for molding secondary products of tubular concrete such as box culverts are constructed by connecting the left and right inner mold members that make up the inner mold to the rotating shaft via a connecting plate in a rotating manner. A cylindrical inner mold with a split structure that has a movable mechanism that adjusts the lateral width of the left and right inner mold members by the action of the feed screw of the shaft is detachably inserted into the inner side of the lateral cylindrical outer mold. It has a worn structure.

[0003] In a state where the inner mold is combined with the inner side of the outer mold, fresh concrete is poured and molded. When concrete is solidified and the molded product is released from the mold, the rotary shaft is rotated and the left and right inner mold members are moved to the center side via the connecting plate to the boss that is screwed into this and moves in the axial direction. Then, the width of the left and right inner mold members is narrowed to form a gap with the product. After that, the inner mold was pulled out laterally from the box culvert by a forklift, etc., then the side plate of the outer mold was opened and the molded box culvert was taken out.

When the inner mold is pulled out from the box culvert thus molded, it is difficult to keep balance because it is pulled out while being lifted by a fork lift or the like, which requires skill and poor workability.

[0005]

[Problems to be solved by the device]

 The present invention eliminates the above-mentioned drawbacks and provides an inner mold attaching / detaching device capable of easily pulling out the inner mold from the inside of a molded tubular concrete secondary product.

[0006]

[Means for Solving the Problems]

 The present invention is a movable mechanism that adjusts the lateral width of the left and right inner mold members by rotatably connecting the left and right inner mold members that form the inner mold to a rotating shaft via a connecting plate and operating the feed screw of the rotating shaft. Both ends of the rotating shaft are supported in the form of a tubular concrete secondary product in which a tubular inner mold having a split structure with the above is detachably inserted inside the lateral tubular outer mold. A hook mounting hole is opened in the shaft support part, and a hanging hook is attached to the upper horizontal member of the drawing jig in which one end of the upper horizontal member and the lower horizontal member is joined in a U shape by a vertical connecting member. At the same time, the lower horizontal member is attached with hooks on the bottom of the lower mold to correspond to the shaft supports of the inner mold, and the lower horizontal member of the pull-out jig is combined with the inner side of the outer mold. Insert the hook from the hook and hook it in the hook mounting hole opened in both shaft support parts. And it is characterized that you have to pull out from the inside of the cylindrical secondary concrete products that are molded lifting the entire inner mold by hanging hooks provided on the upper horizontal member in the horizontal direction.

[0007]

[Action]

 The inner mold attaching / detaching device of the present invention changes the angle of the connecting plate by the action of this feed screw when the rotating shaft is rotated after the concrete is poured into the form and is molded. The mold member is pulled inward and bent toward the center side, and its lateral width becomes narrower, and the mold member inside the upper surface becomes lower and peels from the inner surface of the tubular concrete secondary product to form a gap therebetween.

After that, the hanging hook connected to the upper horizontal member of the drawing jig is hung on the hook of the crane to hang the drawing jig, and in this state, the lower horizontal member is inserted into the inner mold from one end of the mold. The hook hook into the hook mounting hole opened in the shaft support. When the crane is raised a little in this state, the inner mold supported by the extraction jig is lifted, and when the crane is moved further, the inner mold is pulled laterally from the inside of the molded tubular concrete secondary product. You can do it.

[0009]

The present invention will be described in detail below with reference to FIGS. 1 to 5. FIG. 1 shows a concrete formwork for molding a box culvert, in which an inner mold 2 having a divided structure is detachably inserted inside an outer mold 1 having a lateral octagonal tubular shape. The outer die 1 has a left side outer die member 1a and a right side outer die member 1b attached to a base 3 by a hinge 4 so as to be vertically openable and closable. The front outer mold member 1c is hingedly attached to the right side outer mold member 1b as shown in FIG. 2, and the rear outer mold member 1d is hinged to the left side outer mold member 1a. It is installed freely.

Further, as shown in FIG. 1, the inner mold 2 inserted inside the outer mold 1 has a left side lower inner mold member 2b and a right side lower lower mold member 2c on both sides of the bottom inner mold member 2a. It is integrally formed, and the iron plate portion between them becomes the hinge portion 5 and is bent. Further, a left side upper inner mold member 2e and a right side upper inner mold member 2f are rotatably connected to both sides of the upper surface inner mold member 2d via a hinge 6 to form an octagonal divided structure. Further, as shown in FIG. 5, two rotary shafts 7a and 7b are provided in upper and lower stages inside the inner mold 2, and both ends of the lower rotary shaft 7a are erected at both ends of the bottom inner mold member 2a. It is supported by the shaft support portions 8, 8. Further, both ends of the upper rotary shaft 7b are supported by shaft support portions 9, 9 suspended from both ends of the upper surface inner mold member 2d. Square rods 10 and 10 are formed at the front ends of the rotary shafts 7a and 7b, respectively. Further, a hook mounting hole 11 is opened in the upper portion of the shaft supporting portion 8 on the front side that supports one end of the lower rotating shaft 7a.

As shown in FIG. 2, the lower rotary shaft 7a is provided with threaded portions 12, 12 formed on the opposite sides thereof, respectively, which are formed as reverse threads. The threaded portions 12, 12 are provided with bosses 13, 13 respectively. Are screwed together. The bosses 13, 13 and the left side lower inner mold member 2b and the right side lower inner mold member 2c on both sides are rotatably connected via a connecting plate 14 ... By rotating the rotary shaft 7a, a feed screw action is performed. The bosses 13, 13 move axially in opposite directions to each other, the angle of the connecting plates 14 changes, and the lateral width between the left side lower inner mold member 2b and the right side lower inner mold member 2c connected thereto. Can be adjusted.

Further, the upper rotary shaft 7b is also constructed in the same manner, and as shown in FIG. 5, screw parts 12 and 12 formed in reverse threads are provided on both sides thereof, and the screw parts 12 and 12 are provided with bosses 13 respectively. , 13 are screwed together. As shown in FIG. 1, the bosses 13, 13 and the left side upper inner mold member 2e and the right side upper upper mold member 2f are rotatably connected via a connecting plate 14 ... When rotated, the bosses 13 and 13 are moved in the axial direction by the action of the feed screw, the angle of the connecting plates 14 is changed, and the left side upper inner mold member 2e and the right side upper inner mold member 2f connected thereto are changed. The width of and can be adjusted.

As shown in FIG. 3, reference numeral 15 denotes a drawing jig, which is an upper horizontal member 15a and a lower horizontal member 15b, which are integrally joined at one end thereof with a vertical connecting member 15c in a U-shape. The hanging hook 16 is attached to the lower horizontal member 15b, and two hooks 17 and 17 are attached to the bottom surface of the lower horizontal member 15b in a lateral direction so as to correspond to the shaft supporting portions 8 and 8 of the inner mold 2.

When a box culvert is manufactured using the above-mentioned frame, in the state shown in FIGS. 1 and 2, green concrete 18 is poured between the outer mold 1 and the inner mold 2 from the upper part of the frame to mold and solidify. Let When demolding, when a rotating tool (not shown) is attached to the square rod portion 10 at the tip of the rotary shafts 7a and 7b and the rotary shafts 7a and 7b are rotated, the distance between the bosses 13 and 13 is increased by this feed screw action. Spread and the angle of the connecting plates 14 changes, and the left and right side lower inner mold members 2b, 2c connected to this are pulled toward the center side as shown in FIG. 4 and bent inward through the hinge portion 5, The left and right side upper inner mold members 2e, 2f are bent inward by the hinges 6 and their lateral widths are narrowed.

As a result, the left side lower inner mold member 2b and the left side upper inner mold member 2e, and the right side lower inner mold member 2c and the right side upper inner mold member 2f bend, and the left and right side upper inner mold members 2e 2f, which is connected with the hinge 6 by the upper surface, is lowered and separated from the box culvert 19 as shown in FIG. 5, and a gap is formed therebetween.

After that, a hook of a crane (not shown) is hooked on the suspension hook 16 connected to the upper horizontal member 15a of the extraction jig 15 shown in FIG. 3 to suspend the extraction jig 15, and in this state, as shown in FIG. The lower horizontal member 15b is inserted between the upper and lower rotary shafts 7a and 7b from the rear side of the form, and the hooks 17 and 17 provided on the bottom surface of the lower horizontal member 15b are attached to the shaft support portions 8 and 8. Hook at 11, 11. When the crane is raised a little in this state, the inner mold 2 supported by the extraction jig 15 is lifted, and when the crane is further moved, the inner mold 2 can be extracted laterally from the inside of the molded box culvert 19. . Thereafter, the left and right side outer mold members 1a, 1b and the front and rear outer mold members 1c, 1d are opened and the box culvert 19 is taken out. When assembling the inner mold 2, the inner mold 2 is similarly lifted by the drawing jig 15 and carried into the outer mold 1.

In the above-mentioned embodiment, the case where the inner mold attaching / detaching device is attached to the frame for molding the box culvert has been described, but the invention can also be applied to a mold for a tubular concrete secondary product such as a pipe.

[0018]

[Effect of device]

 As described above, according to the inner mold attaching / detaching device for a tubular concrete secondary product according to the present invention, the lower horizontal member of the U-shaped drawing jig is inserted into the inner mold and attached to the lower horizontal member. Since the inner mold is hooked with the hook hook and pulled out while lifting, the balance is easy to take and the mold can be easily removed without requiring any skill.

[Brief description of drawings]

FIG. 1 is a front view of a mold according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a perspective view showing a drawing jig of the present invention.

FIG. 4 is a front view of the mold showing a state in which the width of the inner mold is narrowed and a drawing jig is attached.

5 is a vertical side view of FIG.

[Explanation of sign]

 1 Outer mold 2 Inner mold 3 Base 4 Hinge 5 Hinge part 6 Hinge 7a Rotating shaft 7b Rotating shaft 8 Shaft supporting part 11 Hook mounting hole 12 Screw part 13 Boss 14 Connecting plate 15 Drawing jig 15a Upper horizontal member 15b Lower horizontal member 16 Hanging hook 17 Hanging hook 19 Box culvert

Claims (1)

[Scope of utility model registration request] 1. A movable mechanism that adjusts the lateral width of the left and right inner mold members by rotatably connecting the left and right inner mold members forming the inner mold to a rotary shaft via a connecting plate and operating the feed screw of the rotary shaft. In the form of a tubular concrete secondary product in which a cylindrical inner mold having a split structure is detachably inserted inside a laterally cylindrical outer mold, both ends of the rotary shaft are supported. A hook attachment hole is opened in the shaft support part, and a hanging hook is attached to the upper horizontal member of a drawing jig in which one end of the upper horizontal member and the lower horizontal member are joined in a U shape by a vertical connecting member. At the same time, hook hooks are attached to the bottom surface of the lower horizontal member corresponding to both shaft support parts of the inner mold, and the lower horizontal member of the drawing jig is inserted from one end side of the inner mold combined inside the outer mold. Then, hook the hook on the hook mounting hole opened in both shaft support parts, Inner mold attachment / detachment of a tubular concrete secondary product, characterized in that the entire inner mold is hoisted by a suspension hook provided on the upper horizontal member so as to be laterally pulled out from the inside of the molded tubular concrete secondary product. apparatus.