JPH0728612U - Hole forming device in concrete block molding formwork - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a hole forming device which can be easily removed from a mold with a remarkably simple structure despite the use of a hole forming mold member having a relatively small taper. Another object of the present invention is to provide a hole forming apparatus that can perform mold assembling and demolding work easily and efficiently at low cost, and another object is to provide a durable hole forming apparatus. It is in. [Structure] An opposed form member 3 for forming a concrete wall part is adopted by adopting a rubber-made hole forming mold member 6 which is gradually narrowed at a tip thereof.
The hole forming mold member 6 is fixed to the mold forming member 6, and the length of the hole forming mold member 6 is adjusted so that the tip end surface of the hole forming mold member 6 is in pressure contact with the other facing mold member 2 in the mold assembly state. It is characterized by being selected to be reasonably larger than the thickness dimension.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for forming a through hole in a wall portion of a concrete block, and more specifically, to a wall portion of a gutter block, an underdrain block, a manhole block, etc., for collecting water, draining water, or the like, or The present invention relates to a hole forming device for forming a relatively small through hole at the same time as molding, for lifting or reversing a product.

[0002]

[Prior art]

 As a device for forming a through hole in a wall portion of a concrete block, there is, for example, a technique described in Japanese Utility Model Laid-Open No. 4-58303, in which a cylindrical body adapted to form a hole in a wall surface forming frame is detachably attached by a bolt. When mounting and demolding, leave the tubular body inside the concrete molded product, remove the bolts and demold, and then use a hammer or the like to pull out, or a cylinder that is suitable for forming holes in a wall forming mold. The cylindrical body is elastically provided by a coil spring or an elastic body such as rubber so that it can be separated from the concrete molded product when the mold is released, so that the cylindrical body does not come out immediately and becomes elastic. The body stretches and the restoring force pulls the tubular body, and the tubular body can be pulled out along the holes formed in the concrete molded product by the tensile force of the elastic body.

[0003]

[Problems to be solved by the device]

 In the technique described in Japanese Utility Model Laid-Open No. 4-58303, in the case of the detachable type using the bolt, not only the mounting and demolding work is complicated, but also the cement adheres to the bolt and solidifies, and cleaning is troublesome. In addition, in the case of a model with an elastic body interposed, it is often difficult to smoothly separate the cylindrical body for hole formation from the concrete molded product, so it is necessary to force the mold frame during demolding. When the elastic body is opened, a severe external force is applied to the elastic body, and the elastic body is damaged or fatigued in a short period of time.

Therefore, an object of the present invention is to provide a hole forming device which can be easily removed from a die with a remarkably simple structure even though a tapered hole forming die member having a relatively small taper is applied. Another object of the present invention is to provide a hole forming device which can easily and efficiently perform mold assembling and demolding work at low cost, and another object is to provide a durable hole forming device. To provide.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention fixes a hole forming mold member made of rubber, which is gradually narrowed toward the tip, to one of the opposing form members for concrete wall molding, and It is characterized in that the length thereof is selected to be appropriately larger than the wall thickness dimension of the molding wall portion so that the front end surface thereof is in pressure contact with the other mold member facing in the assembled state. The rubber forming the hole forming mold member is rubber or synthetic resin having flexibility and being relatively hard, and includes these.

[0006]

[Action]

 The rubber hole-forming mold whose tip is gradually tapered has its tip face pressed against the opposing mold member during mold assembly, and the thickness increases due to the deformation caused by the pressure contact. As a result, the rubber hole forming die member is reduced in diameter by restoration when it is released from the mold, and it also bends due to its own flexibility, resulting in smooth release from the mold. To be done. Although the hole forming mold member is provided in a cantilevered state, the front end of the hole forming mold member is pressed against the opposing mold member and stably held during the mold assembly.

[0007]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. As a concrete block molding mold to which the hole forming device of the present invention is applied, for example, as shown in the figure, a mold member 2 as an inner mold having an inverted U-shaped cross section is mounted on a base 1. Besides, formwork members 3 and 3 as side plates are pivotally attached to the base 1 by hinges 4 and 4 so as to be openable and closable on both left and right sides thereof, and end plates 5 and 5 are provided front and rear so as to be contactable and separable, and In the vicinity of the center of the mold frame members 3, 3, a mold frame of a type adapted to mold a concrete block for U-shaped gutters in which frusto-conical mold members 6 for forming holes with gradually smaller tips 6 are provided inward. Adopt.

As a special configuration of the present invention for the mold of the above-mentioned type, as shown in the figure, for the frustoconical mold members 6 and 6 for forming holes, these are made of rubber having appropriate flexibility and hardness. Alternatively, it is made of synthetic resin, and for attachment, for example, retaining rings 8 are formed near the tip of the flanged bolt 7, and the mold member 6 is press-fitted to the tip of the bolt 7 while the mold frame member is being fitted. 3 may be fixed with a nut 9 in the present invention. Further, in the present invention, the length of the mold member 6 for forming a hole should be such that the tip thereof is sufficiently pressed against the mold surface of the mold member 2 facing in the mold assembled state. In addition, the size of the wall of the molding block is selected to be appropriately larger (for example, 2 to several mm longer). Therefore, the tip of the mold member 6 is pressed against the opposing mold member 2 during the mold assembly, and the pressure contact is made. The deformation of the mold member 6 Since the thickness increases, the concrete is molded under the condition that the thickness has increased, and at the time of demolding, the mold member 6 restores its thickness by its elasticity as shown in FIG. Since the diameter of the mold member 6 is reduced and the mold member 6 has an appropriate flexibility, the mold can be smoothly removed while flexing in conformity with the shape of the holes of the molding block.

Although the above-described embodiment is a case where the present invention is applied to a mold for forming a U-shaped gutter concrete block, it is needless to say that the present invention can be applied to various other molds for molding. Also, the shape of the mold member 6 made of rubber or the like is not limited to the truncated cone, but may be various other shapes such as a polygonal truncated pyramid, that is, it may be tapered.

[0010]

[Effect of device]

 As described above, according to the present invention, as the mold member 6 for forming a hole that is fixedly mounted on the openable mold member 3, a tapered shape made of rubber or synthetic resin having appropriate flexibility and hardness. And the length of the mold member 6 is selected to be larger than the wall thickness of the molding block wall so that the tip of the mold member 6 is sufficiently pressed against the mold surface of the mold member 2 facing in the assembled state. The mold member 6 for forming is used for molding while being stably supported in a mold assembled state while being pressed to increase its thickness, and when it is released from the mold, the mold member 6 is shrunk to be smaller than the thickness of the molded hole due to its own elasticity. Since the mold member 6 for forming holes is bent by its own elasticity, the mold member 6 comes into contact with the inner surface of the formed hole when the mold frame member 3 is opened and closed. Also, the flexibility of the mold member 6 makes it easy to remove the mold while bending. Door has the effect of it is, moreover equipment itself is an addition to inexpensive there is a remarkably simple and durable.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing a mold assembly state of a concrete block molding frame to which a hole forming device of the present invention is applied.

FIG. 2 is a vertical sectional front view of essential parts showing a demolding process of a concrete block molding frame to which the hole forming device of the present invention is applied.

[Explanation of symbols]

 2 Formwork member 3 Formwork member 6 Forming member for forming holes

Claims (1)

[Scope of utility model registration request] 1. A mold member (2) and a mold member (3) facing each other are provided in an opened / closed relationship, and one of the mold members (3) is for forming a hole whose tip is gradually narrowed. In a concrete block molding frame having a mold member (6) facing inward, the mold member (6) is made of rubber or synthetic resin having appropriate flexibility and hardness, and the mold member (6) Concrete block molding characterized in that the length thereof is selected to be larger than the wall thickness of the molding block wall so that the tip is sufficiently pressed against the mold surfaces of the mold members (2) facing each other in the mold assembly state. Forming device for molds.