JPH06254833A - Apparatus for fixing step for concrete frame - Google Patents

Abstract

PURPOSE:To avoid generation of an excessive pushing pressure between a step and a divided mold, to make movement of the divided mold easy and to prevent a situation for damaging the step and the divided mold from occurring by providing a supporting mechanism for supporting the divided mold movably between an upper position and a lower position and a pushing-down mechanism for pushing down the divided mold from the upper position to the lower position when the divided mold is forwarded. CONSTITUTION:A step fixing apparatus 30 for a frame for concrete is provided with a main body mold 31 for molding the general face of the wall part of a body to be molded and a divided mold 33 being provided movably forward and backward on an opening part 32 provided thereon and expanding to the outside and wherein when it is retreated, the step S molds a facing wall face while the end part of the step S is buried in the wall part of the body to be molded by supporting the step S and when it is advanced, a gap through which the step S can pass can be formed between the opening part 32. In addition, a supporting mechanism 40 supporting the divided mold 33 between the upper position closing the gap and the lower position opening it when the divided mold 33 is advanced and a pushing-down mechanism 60 pushing down forcibly the divided mold 33 from the upper position to the lower position are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a step mounting device for a concrete molding frame for mounting a step on a wall of a concrete molding such as a manhole.

[0002]

2. Description of the Related Art As concrete moldings, for example,
There is a manhole 1 as shown in FIG. This manhole 1 has two projections 2 projecting from the inner wall thereof, and a plurality of rod-shaped steps S are provided between the projections 2 to form a ladder. Both ends of this step S are bent at right angles and embedded in a concrete molding.

A conventional step mounting device is provided on a concrete molding frame for molding the manhole 1.
The concrete molding frame is, for example, as shown in FIG.
An outer mold 11 which is divided and moves on the rail 10 to remove the mold,
An inner die 12 supported on the rail 10 and divided to retreat inward to be removed from the die. The inner mold 12 is a movable inner mold 13 for molding between the protrusions 2 of the manhole 1 and retracted by a moving device (not shown), a fixed inner mold 14 for molding a circumferential surface of a half circumference or less, and the like. Of the inner surface of the fixed inner mold 14 and the hinge 1 which is continuous with the fixed inner mold 14 via the hinge 15.
It is composed of a movable inner mold 16 which is bent from 5 parts and retracts.

In this molding frame, there is a conventional step mounting device 20 proposed by the applicant of the present invention as shown in FIGS. 7 and 8, for example (Japanese Patent Laid-Open No. 4-2751).
No. 04 publication). This is the inner mold 13 for molding between the above-mentioned protrusions.
The main body mold 21 for molding the general surface of the inner wall of the manhole 1 in which the wall surface and the mounting surface thereof facing each other are opened in step S, and the step S is inserted in the open portion 22 of the main body mold 21. And a plurality of molds 23 for molding wall surfaces facing each other. The open portion 22 of the main body mold 21 is a recess that expands outward, and the lower surface portion inclines downward from the inside to the outside. The mold 23 is capable of advancing and retracting in a direction R different from the demolding direction D, and forms a gap C through which the step S can pass when advancing, with the upper surface of the opening 22. It is supported by 21.

When molding the manhole 1 with this concrete molding frame, as shown in FIG. 8 (a), first, in the mold assembly, step S is placed on the holding portion 28 of the mold 23 and separated. The mold 23 is retracted. In this state,
The outer mold 11 and the inner mold 12 are positioned at the molding position, and then fluidized concrete is poured between the outer mold 11 and the inner mold 12 to cure for a required time.

At the time of taking out the product, first, the outer mold 11 is demolded. Next, as shown in FIG. 8B, the inter-projection molding inner mold 13 and the movable inner mold 16 are retracted with respect to the fixed inner mold 14. In this case, in the step attachment device 20, as shown in FIG. 8C, the main body mold 21 is retracted, but in step S, the end portion is embedded in the molded body and is fixed, so that it does not move. , Step S relatively pushes the mold 23, and therefore the mold 23 advances toward the main mold 21 and a downward component force is generated. It advances in the downward direction R different from.

When the body die 21 is further retracted, FIG. 8 (d)
As shown in, the step S relatively passes through the gap C formed between the mold 23 and the upper surface of the main mold 21. As a result, the step S is easily attached and the mold 23 is easily released from the mold.

[0008]

By the way, in the above-mentioned conventional step mounting device, since the step S relatively pushes the mold 23 at the time of demolding, if the pressing force is large, It becomes difficult to move the mold 23,
Since the pressing force during movement is large, step S
There was a problem that 3 might be damaged. Since the step S is generally covered with resin, the resin portion may be peeled off or otherwise damaged. In particular, when the number of embedded steps S increases, the pressing force of the steps S increases, and the above-mentioned problem is likely to occur.

The present invention has been made in view of the above problems, and an object thereof is to prevent an excessive pressing force from being generated between a step and a mold and to facilitate the movement of the mold. The point is to prevent the situation where the steps and molds are damaged.

[0010]

The technical means of the present invention for solving such a problem is to provide a main body mold for molding a general surface of a wall portion of an object to be molded and an outer side provided on the main body mold. It is provided so that it can be moved forward and backward with respect to the opening that expands, and while supporting the step when retracting and embedding the end of the step in the wall of the molded object, molding the wall surface facing the step, In a step attachment device for a concrete molding frame, which comprises a mold capable of forming a passing gap between it and an open part, when the mold is advanced, the mold is closed at the upper position and the gap is opened at the lower position. A support mechanism for movably supporting the position and a pressing mechanism for forcibly pressing the mold from the upper position to the lower position when the mold is advanced are provided.

[0011]

According to this means, when the mold is assembled, the mold is retracted with respect to the main mold and the steps are supported by the mold. In this state, concrete is poured to mold the molding target. Further, when the product is taken out, the mold is advanced from the main mold, but even if the mold is in the upper position while supporting and holding the step and closing the gap through which the step passes,
This mold is forcibly pushed down from the upper position to the lower position by the pressing mechanism, the mold is disengaged from the step without causing an excessive pressing force between the step and the mold, and the step is allowed to pass through the gap. As a result, the mold can be easily demolded.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A step mounting device for a concrete molding frame according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

1 to 3 show a step mounting device for a concrete molding frame according to an embodiment of the present invention. The concrete molding frame to which this embodiment is applied molds the manhole 1 as the molding target shown in FIG. 6, as described above. This manhole 1 has two projections 2 projecting from the inner wall thereof, and a plurality of rod-shaped steps S are provided between the projections 2 to form a ladder. Both ends of this step S are bent at right angles and embedded in a concrete molding. The intermediate portion of step S is covered with resin.

As shown in FIGS. 2 and 3, the concrete forming frame to which the embodiment is applied is an iron plate forming body,
Outer mold 11 that is divided into two and moves on the rail 10 to demold
And an inner die 12 that is supported on the rail 10 and that is divided and retreats inward to demold. That is, the inner mold 12
Is a moving device 5 which will be described later by molding between the protrusions 2 of the manhole 1.
The movable inter-projection molding inner mold 13 that retreats by 0, the fixed inner mold 14 that molds a circumferential surface of a half circumference or less, the other circumferential surface, and the fixed inner mold 14 via the hinge 15 It is composed of a movable inner mold 16 which is continuous with the hinge 15 and is bent back. Reference numeral 17 is a link mechanism for retracting the movable inner mold 16.

In this molding frame, as shown in FIGS. 1 to 3, the step mounting device 30 according to the embodiment is provided in the inter-projection molding inner mold 13, and the wall surface and the mounting surface of the step S facing each other. And a main mold 31 for molding the general surface of the inner wall of the manhole 1 and an opening 32 of the main mold 31.
And a split mold 33 which is fitted in and molds the opposing wall surface at step S. The separating mold 33, as shown in FIG.
A plurality (six stages in the embodiment) are provided. The open portion 32 of the main body mold 31 is a recess that expands outward, and the lower surface portion inclines downward from the inside to the outside.

The split mold 33 is formed in a hollow shape, and the lower surface thereof is formed as an inclined surface that is in sliding contact with the lower surface portion of the open portion 32, and is movable back and forth with respect to the main body mold 31. A holding part 3 for supporting and holding step S is provided on the upper inside end of the mold 33.
4 are formed. The holding portion 34 holds the step S in cooperation with the holding portion 35 of the main body die 31 when the split die 33 is retracted.

Further, when the separating die 33 is advanced to the upper position A
(FIG. 5 (c)) and the lower position B (FIG. 4 (a), FIG. 5 (d,
e)), and in the lower position B, the gap C through which the step S can pass (FIG. 5 (d, e)).
Is formed between the upper surface of the opening 32 and the upper surface of the opening 32.

Reference numeral 40 is a support mechanism for movably supporting the separating die 33 between an upper position A which closes the gap C and a lower position B which opens the gap C when it is advanced. The support mechanism 40 includes a pair of shafts 41 that vertically pass through the main body 31.
Through the wall forming the open portion 32 of the main mold 31,
One end is fixed to the lower surface of the mold 33, and the other end is provided with a pair of support plates 42 fixed to the shafts 41, respectively. The shaft 41 allows the mold part 33 to move back and forth with respect to the main mold part 31, and when the mold part 33 is advanced,
In order to be able to move up and down, it penetrates through the long hole 43 formed in the main body mold 31, and moves up and down and forward and backward.

In the support mechanism 40, reference numeral 44 is a clamp mechanism for retracting and clamping the split mold 33 via the shaft 41 during mold assembly, and the clamp mechanism 44 is provided in the center of the inner mold 12 for rotation. A first link 46 that is rotated by a shaft 45, and a connecting plate 47 that is provided between the shaft 41 and is slidable vertically relative to the shaft 41.
And a second link 48 connecting the first link 46 and the connecting plate 47. Then, at the retracted position of the split mold 33, both links 46 and 48 are pulled by the rotation of the rotary shaft 45 in the R1 direction in FIG.
Clamp the split mold 33 to the retracted position via the
By the rotation of R5 in FIG. 1 in FIG. 1, both links 46, 48
Is released and the clamp of the mold part 33 is released via the shaft 41. Reference numeral 49 denotes a ratchet mechanism 49 that restricts rotation of the rotary shaft 45 in the R2 direction at the retracted position.

Reference numeral 50 denotes a moving mechanism for directly pulling and retracting the main mold 31 of the projection space molding inner mold 13 at the time of demolding.
The moving mechanism 50 includes a first link 52 that is rotated by a rotation shaft 51 that is rotatably provided on the fixed inner mold 14.
And a second link 53 that connects the first link 52 and the main body die 31.

Reference numeral 60 denotes a pressing mechanism for forcibly pressing the mold 33 from the upper position A to the lower position B when the mold 33 is advanced. The pressing mechanism 60 has a pair of vertical holes 61 having the same axis line in each of the molds 33, and a pair of rods 62 inserted into the vertical hole 61 rows. Protrusions 6 that engage with each vertical hole 61 when they are inserted into the vertical hole 61 row in the rod 62
3, each vertical hole 61 is provided with a notch 64 that allows the projection to pass therethrough, and the projection 63 is passed or locked depending on the rotation position of the rod 62. Also,
The outer mold 11 is provided with a clip 64 for holding the rod 62 when it is not used.

Further, in the pushing mechanism 60, 65 gives a pushing force for pushing the inserted rod 62 downward,
It is an input unit that presses the split mold 33 via the rod 62. The input unit 65 is rotatably supported by the outer mold 11, and is provided with a block 66 that is rotated and can be moved to an upper position X of the split mold 33 and a separated position Y separated from the upper position X. In the upper position X of the block 66, a pair of shaft-shaped pushers 67 that move forward and backward to press the head 62a of the rod 62 to apply the pressing force is provided corresponding to each rod 62. ing.

A male screw is formed on the outer periphery of the pusher 67, and the pusher 67 is screwed into a female screw 68 provided on the block 66 and moves by rotation. Head 67 of pusher 67
"a" is formed in a hexagonal shape so that a spanner or the like for rotating the pusher 67 is engaged. Also, both pushers 67
Sprocket 69 is provided in the middle of each of the
A chain 69a is stretched between the sprockets 69, and the rotation of one pusher 67 is also transmitted to the other pusher 67 so that both pushers 67 rotate in synchronization and feed of the same size is possible. There is.

Therefore, when the manhole 1 is molded with this concrete molding frame, the following is done.

First, in the mold assembly prior to molding, FIG.
As shown in (a), in the step attachment device 30,
The mold 33 is advanced and positioned at the lower position B, step S is placed on the holding portion 34 of the mold 33, and the clamp mechanism 44 of the support mechanism 40 is rotated as shown in FIG. 4B. Axis 4
1 is rotated in the R1 direction in FIG. 1, both links 46, 48 are pulled, the split mold 33 is retracted, and the main mold 31 is clamped.

In this state, the outer mold 11 and the inner mold 12 are positioned at the molding position, and then the fluidized concrete is moved to the outer mold 1.
It is poured between 1 and the inner mold 12 and cured for the required time.

At the time of taking out the product, as shown in FIG. 5C, the ratchet mechanism 49 of the support mechanism 40 is released, and the rotating shaft 45 of the clamp mechanism 44 is slightly rotated in the direction R2 in FIG. It is released so that both links 46 and 48 can be extended. In this state, the moving mechanism 50 causes the main mold 31 to retract by the length of the long hole 43. As a result, as shown in FIG. 1, the main mold 31 moves backward until the long hole 43 of the main mold 31 contacts the shaft 41.
6,48 stretch. In this case, since no force acts on the shaft 41 and the mold 33, the mold 33 remains in the molding position while holding the step S.

In this state, the rod 62 of the pressing mechanism 60 is removed from the clip 64 of the outer mold 11, and the vertical hole 61 of the split mold 33 is removed.
Insert in a row. Once inserted, the rotation position of the rod 62 is changed to lock the projection 63 in the vertical hole 61.

Next, as shown in FIGS. 1, 2 and 4 (d), the block 66 of the input portion 65 of the push-down mechanism 60 is rotated to be positioned at the upper position X. Then, in this state, one pusher 67 is rotated by a spanner or the like. As a result, the rotation of one pusher 67 is also transmitted to the other pusher 67 via the chain 69a and the sprocket 69, and both pushers 67 rotate in synchronization and advance downward to press the head 62a of the rod 62. . for that reason,
Since the rod 62 is pushed down, the pushing force is transmitted to the split mold 33 via the projection 63 of the rod 62, and the split mold 33 is forcibly pushed down from the upper position A to the lower position B.

At this time, since the split mold 33 only supports the step S, it is easily separated from the step S. Therefore, an excessive pressing force is not generated between the step S and the mold 33, and the situation in which the step S or the mold 33 is damaged is prevented.

Next, the block 66 of the input section 65 of the push-down mechanism 60 is rotated to position it at the separated position Y. In this state, the rotary position of the rod 62 of the push-down mechanism 60 is changed to form the projection 63 in the vertical hole 61. To pass through, and pull out from the vertical hole 61 row. Then, it is attached to the outer clip 64.

Thereafter, as shown in FIG. 4 (e), the moving mechanism 50 further retracts the main mold 31. in this case,
Since the mold 33 is in the lower position B, step S
The mold 33 is easily released from the mold 33 by relatively passing through the gap C formed between the upper surface of the main mold 31 and the main mold 31. Also in this case, the step S and the mold 33 are separated from each other,
Since no pressing force is generated during this time, the mold 33 can be easily moved.

Then, the outer mold 11 is demolded, and
The movable inner mold 16 is bent and retracted with respect to the fixed inner mold 14, and the manhole 1 is pulled up from the inner mold 12 by a crane or the like to remove the mold.

Although the above embodiment is applied to the manhole 1 molding frame, the present invention is not limited to this and may be used for a molding frame for other concrete moldings such as a fire protection water tank.

[0035]

As described above, according to the step attaching device for the concrete forming frame of the present invention, at the time of demolding, the separating mold is in the upper position while supporting and holding the step, and the gap through which the step passes is closed. However, the pressing mechanism forcibly pushes down the mold from the upper position to the lower position, and the mold can be released from the step without causing an excessive pressing force between the step and the mold. It is possible to prevent the situation in which the mold is damaged, and it is possible to easily move the mold because the steps can easily pass through the gap without applying a load.

[Brief description of drawings]

FIG. 1 is a perspective view of essential parts showing a step attachment device for a concrete molding frame according to an embodiment of the present invention.

FIG. 2 is a side sectional view showing a step mounting device according to an embodiment of the present invention together with a concrete molding frame.

FIG. 3 is a plan view showing a step mounting device according to an embodiment of the present invention together with a concrete molding frame.

FIG. 4 is a view showing the operation of the step attaching device according to the embodiment during mold assembly.

FIG. 5 is a diagram showing an operation when the step attaching device according to the embodiment is released from the mold.

FIG. 6 is a perspective view showing an example of a concrete molded body molded by a concrete molding frame to which the present invention is applied.

FIG. 7 is a perspective view showing a conventional step attachment device together with a concrete molding frame to which the device is applied.

FIG. 8 is a view showing an operation of a conventional step mounting device during mold assembly.

[Explanation of symbols]

 S Step 1 Manhole (molded object) 11 Outer mold 12 Inner mold 13 Inter-projection molding Inner mold 14 Fixed inner mold 16 Movable inner mold 20 Step mounting device 30 Step mounting device 31 Main body type 32 Opening part C Gap 33 Minute mold 34 Holding part A Upper position B Lower position 40 Support mechanism 41 Shaft 42 Support plate 43 Long hole 44 Clamping mechanism 50 Moving mechanism 60 Depressing mechanism 61 Vertical hole 62 Rod 65 Input part 66 Block 67 Pusher

Claims (1)

[Claims] 1. A main body mold for molding a general surface of a wall portion of an object to be molded, and an opening portion provided on the main body mold and expanding outwardly. Concrete molding with a mold that can form a gap through which the step passes when advancing while burying the end of the step in the wall of the object to be molded and molding the wall faced by the step In the frame step attachment device, a support mechanism that movably supports the mold between an upper position for closing the gap and a lower position for opening the gap when the mold is advanced.
A step attachment device for a concrete molding frame, comprising a pressing mechanism for forcibly pressing the mold from the upper position to the lower position when the mold is advanced.