JPH0716819A - Supporting mechanism for coreframe of form for molding cylindrical concrete product - Google Patents

Abstract

PURPOSE:To vertically move and slide a core to easily extract the core by a method wherein the core is horizontally held by a holding body, the holding body is supported by being connected to link members, and both ends of the link member are hinged rotatably in a slide direction. CONSTITUTION:A holding body 6 composed of two arm bodies 7 and a frame plate 8 is mounted on one end of a core 3. Two sets of link members 9, 10 are mounted crosswise on the arm bodies 7. Both ends 9a of the link member 9 are hinged rotatably in a slide direction. The link member 10 is similarly hinged to be moved in parallel to the link member 9. An expansion means 11 is expandably mounted by a turnbucke. An operation rod 12 operated by a handle 15 is brought into contact with an abutting frame 14. Therefore, when a distance D between the abutting frame 14 and the frame plate 8 is enlarged and shortened by rotating the operation rod 12, the link members 9, 10 are erectly moved in parallel, and the core 3 is slightly and vertically moved while keeping its horizontal state, therefore being easily extracted from an outer form 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for molding a tubular concrete product such as a box culvert, which is provided with a slide mechanism for slidingly moving a core frame with respect to an outer frame. And a support mechanism for the core frame used for this.

[0002]

2. Description of the Related Art Conventionally, for example, a cylindrical concrete such as a box culvert having a rectangular cross section used for underdrain drainage.
The molding of a product is usually performed by arranging an outer frame in which opposite side plates and both gable plates are freely disassembled and assembled, and arranging the outer frame at a certain vertical interval to form an internal pipe line space of the product It is performed by using a form frame composed of a core frame. By flowing a fluid concrete into a predetermined space defined by the outer frame and the core frame, and after curing, the core frame and the outer frame are disassembled and released to obtain a concrete product. The process of taking out was taken.

The core frame is generally taken out after curing by supporting the core frame, which is squeezed and contracted, with a crane or a forklift. In the other direction, the core frame is supported in a cantilever state on a slide base arranged slidably along a guide rail arranged below the outer frame base. A method of taking out the core frame by horizontally moving the core was also performed (utility model publication No. Showa 62-11608, etc.).

[0004]

However, the method of sliding the core frame is advantageous in that it is simpler and requires less skill than the case of using a crane or the like, but a conventional example of such a method is used. Supported a core frame on a slide base in a cantilevered manner, and its nodes were rigidly connected.

Therefore, when the contracted core frame is slightly moved up and down by the drawing allowance, the slide base itself for holding the core frame is moved slightly up and down, for example, a step is provided on the guide rail. It was necessary to adopt the configuration of (utility model publication No. 62-11608). In such a structure, since the core frame and the slide base, which are heavy objects, are vertically vibrated, there is a problem in durability, and so-called rattling is likely to occur.

Further, in the rigid support, there is a drawback that if the horizontal maintenance in the cantilever state is not correct, it cannot be corrected. In particular, since the core frame is a heavy object, it is often observed that the horizontal angle is misaligned and the tip portion hangs down a little due to repeated use over many years. Furthermore, when the above-mentioned up-and-down vibration was added, it was even more.

Further, since the core frame is in contact with the concrete on the upper, lower, left and right sides due to its nature, it is difficult to apply the release agent or clean the lower surface in a fixed state. There were also points. Therefore, the present invention has been made for the purpose of solving such a problem, and by connecting and supporting the core frame on a slide base via a link member, the core frame can be vertically moved and horizontally maintained. The present invention provides a core frame support mechanism that can be appropriately and easily performed, and can also rotate the core frame axially.

[0008]

In order to achieve the above object, the core frame supporting mechanism of the cylindrical concrete product molding frame of the present invention is constructed as follows. That is, both side plates,
An outer frame arranged on the base so that both gable plates can be separated and assembled, and a core frame arranged substantially horizontally within the outer frame with a certain vertical interval and configured to be contractible. A mold for molding a tubular concrete product comprising a core frame, the core frame, and a piece on a slide base arranged horizontally movable along the base of the outer frame in the end plate direction. In a core frame support mechanism supported in a holding state, the core frame is held substantially horizontally by a holder attached to one end side, and the holders are respectively arranged at front and rear positions in the sliding direction. Is connected to the slide base via a link member, and both ends of the link member are hinge-coupled to be freely rotatable in the slide direction. The arranged operation rod can be threaded in the sliding direction to keep the penetration. Together are a tip of the operating rod, wherein the abutting frame fixed to the slide base on, is characterized in that let abutted substantially perpendicularly.

Further, it is characterized in that at least one of the link members is provided with a stretching means. Further, the core frame may be attached to the holding body in an integrally fixed state,
Further, it may be mounted in a movable state. That is, the core frame is held by a holder so as to be axially rotatable about a horizontal central axis, and the core frame is provided with driving means for axially rotating the core frame.

[0010]

Embodiment 1 Next, a concrete embodiment of the core frame support mechanism of the tubular concrete product molding frame according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view showing a cylindrical concrete product molding frame using the core frame support mechanism of this embodiment. FIG. 2 is a perspective view showing the core frame support mechanism of this embodiment, and FIG. 3 is a side view thereof.

Form 1 for molding a tubular concrete product
Is usually composed of an outer frame 2 which defines the outer contour of the product, and a core frame 3 which defines a cylindrical internal duct space. The general structure of the outer frame 2 is such that the upper surface is opened and the opposing side plates 2s and the opposing gable plates 2a are attached so that they can be separated and assembled. The separating and assembling mechanism is
There are a door opening type by a hinge and a sliding type by a parallel movement. It should be noted that since these are publicly known technologies from the past, detailed configurations thereof will be omitted.

Further, the core frame 3 is constituted by a known mechanism such as a toggle link mechanism 3a or the like, which is a contraction type mechanism having a narrowed cross-sectional shape. Since there are various types of this contraction mechanism, the detailed description thereof will be omitted. The core frame 3 is a slide base 5 that slides horizontally (arrow a) along a base 4 that serves as a base of the outer frame 2 in the end plate direction.
It is held in a substantially cantilevered state on the top.

Of the sliding directions of the core frame 3 and the slide base 5, the direction in which the core frame 3 is pulled out from the outer frame 2 is the front (arrow b), and the direction in which it is inserted backward is the rear (arrow). It is defined as c) and used in the following description. The embodiment of the present invention relates to a support mechanism for this core frame 3, and a holding body 6 is integrally fixed to one end side 3b of the core frame 3 in a fixed state. The holding body 6 is composed of two arms 7 extending in parallel to the front and a frame plate 8 mounted so as to bridge the front ends of the arms 7.

The arm body 7 of the holding body 6 has two sets of link members 9 and 10 attached to the front and rear positions at regular intervals. In this attachment, the rear link member 9 has a rectangular frame shape, and both end portions 9a thereof are hinge-coupled so as to freely rotate in the sliding direction, and the rear portion 7b of the arm body 7 is attached.
And the upper surface position 5a of the slide base 5 are connected. Further, two link members 10 are arranged parallel to the link member 9 at an upper surface position 5b, which is located forward by a certain length from the upper surface position 5a, and slide with the distal end portions 7c of both arms 7. Both ends 10a are connected to the base 5 by hinge coupling.

Further, the link member 10 is provided with an expanding / contracting means 11 capable of expanding / contracting the member length by a screwing means such as a turnbuckle. In the present embodiment, the expansion / contraction means 11 is attached to the link member 10, but it may be attached to the link member 9 located in the rear. Further, although the link member 9 is configured in a rectangular frame shape, the link member 9 is not limited to this, and may be in a plate shape or a rod shape. Further, the link members 9 and 10 on the slide base are 2 rows by 2 rows. Although it is attached to four fulcrums in a row,
In addition, it may be configured so that three fulcrums are attached at the apex positions of the triangle.

Next, on the frame plate 8 which is bridged and fixed to the opposing arm members 7, the operation rod 12 arranged substantially horizontally is provided.
Is installed. This attachment is performed such that the operating rod 12 having a male screw portion 12 of a fixed length engraved on the outer periphery is screwed into the female screw portion 13 fixed to the frame plate 8 and penetrates rearward. There is. The rear end portion 12t of the operation rod 12 is brought into contact with the front surface of the abutment frame 14 which is vertically erected on the upper surface of the slide base 5 so as to abut substantially vertically.

By adjusting the operation rod 12, the link members 9 and 10 are set to be in a neutral state when they are inclined rearward. The inclination angle α at this time is appropriately selected depending on the setting position of the core frame 3 with respect to the outer frame 2, and if the inclination angle α is set to 90 degrees, the link members 9 and 10 are in an upright state. As a result, the core frame 3 cannot move further upward due to the operating principle described later. Therefore, by setting the angle to 90 degrees or less, the core frame 3 can be appropriately moved upward and downward.

A crank-shaped handle 15 is attached to the front end of the operating rod 12 to allow easy manual operation. Further, rod-shaped grips 16 and 16 extending at right angles to the sliding direction and horizontally facing each other are attached to the attachment portion of the link member 9 of the arm body 7. This is because the grips 16 are gripped and the core frame 3 and the slide base 5 are slid.

[0019]

[Operation of Embodiment 1] With the above configuration,
The core frame support mechanism of this embodiment operates as follows. First, when viewed from the side (see FIG. 3), the arm 7, the link members 9, 10 and the slide base 5 form a parallelogram. Since each connection point is a hinged connection that can freely rotate in the sliding direction, this alone is enough
Means that the link members 9 and 10 move in the tilt direction (arrow c) and downward. That is, the parallelogram will be deformed in the collapsed direction.

Therefore, the operating rod 12 is screwed through the frame plate 8 fixed to the arm body 7, and the tip 12t thereof is extended rearward (arrow c) so that the slide base 5 is moved.
By abutting against the abutment frame 14 which is vertically erected on the upper surface of the arm, the operation rod 12 serves as a support to prevent the arm body 7, that is, the core frame 3 from moving rearward (arrow c). I have to. With such a mechanism, the core frame 3 is held in a cantilever state with a certain distance from the upper surface of the slide base 5.

Next, as shown in the operation diagram of FIG. 4, the handle 15 is operated to rotate the operating rod 12 to widen the distance D between the frame plate 8 and the abutting frame 14 by a certain distance (arrow e). Then, along with this, the link members 9 and 10 hinge-coupled move in parallel so as to stand up (arrow f). As a result, the core frame 3 rises by a slight distance ΔH while keeping horizontal. On the contrary, when an operation for reducing the distance D between the frame plate 8 and the abutting frame 14 is performed, the core frame 3 is slightly lowered while keeping the horizontal state. In this way, by operating the operation rod 12, the vertical position of the core frame 3 can be appropriately changed while maintaining the horizontal state.

Further, as shown in the operation diagram of FIG. 5, the expansion / contraction means 11 of the link member 10 located in the front is operated,
The angle θ with respect to the horizontal plane of the core frame 3, that is, the elevation angle and the depression angle can be changed by appropriately changing the member length. Thereby, the angle θ of the core frame 3 due to repeated use
The deviation can be easily corrected.

[0023]

[Embodiment 2] Next, an example of a concrete embodiment of a core frame support mechanism according to another invention of the present application will be described in detail with reference to the drawings. FIG. 6 is a side view showing the core frame support mechanism of this embodiment, and FIG. 7 is a front view seen from the arrow A of FIG. In the core supporting mechanism according to the above-mentioned invention, the core frame 3 and the holding body 6 are attached in a state of being integrally fixed, but another invention of the present application is that the core frame 3 is The core frame 3 is attached to the holder 6 such that the shaft (horizontal center axis) of the core frame 3 is rotatable.

That is, a support shaft 20 extending horizontally forward from the axial position of the one end 3a of the core frame 3 is attached to the core frame 3, and the support shaft 20 is a substantially box-shaped holder. It is rotatably held by the holding body 21 via bearings 22, 22 arranged at the front and rear positions of 21. Furthermore, the tip portion 20 of the support shaft 20 that extends forward through the holding body 21.
A worm gear mechanism including a disc gear 23 and a worm gear 24 is attached to a. Worm gear 24
A handle 25 is attached to the and is manually operated.

With this structure, when the handle 25 is rotated (arrow g), the support shaft 2 is rotated by the worm gear mechanism.
0 rotates axially, which causes the core frame 3 to rotate axially (arrow h)
Will be done. The holder 21 is connected to the slide base 5 by the same link members 9 and 1 as in the first embodiment.
0 and the arrangement of the operating rod 12 are used, and therefore, the same reference numerals are given in the drawings, and a detailed description of the configuration will be omitted.

[0026]

[Effects] With the above structure, the present invention has the following effects. Since the core frame is attached to the slide base via the link member, the core frame can be appropriately moved up and down by a small amount by operating the operation rod. As a result, there is an advantage in that it is possible to easily move the aperture amount when the core frame is contracted, and it is easy to pull out the core frame.

Therefore, only the core frame can be moved up and down without moving the core frame up and down by the vertical movement of the slide base, which contributes to the improvement of the durability of the mold itself. . Further, since the expansion / contraction means is attached to the ring member, there is an advantage that the horizontal state of the core frame can be easily set and corrected.

Further, when the core frame is rotatably held, there is an effect that the work such as the application of the release agent or the cleaning on the upper, lower, left and right surfaces can be easily performed.
There is also an effect that the position of the dividing surface at the time of contraction can be set to either the upper or lower position.

[Brief description of drawings]

FIG. 1 is a partially omitted side view showing a cylindrical concrete product molding frame using a core frame supporting mechanism of the present embodiment.

FIG. 2 is a perspective view showing a core frame support mechanism of this embodiment.

FIG. 3 is a side view of a partial vertical section showing a core frame support mechanism of the present embodiment.

FIG. 4 is an explanatory diagram showing an operating state of the core frame support mechanism of the present embodiment.

FIG. 5 is an explanatory diagram showing an operating state of the core frame support mechanism of the present embodiment.

FIG. 6 is a side view of a partial vertical section showing the core frame support mechanism of the present embodiment.

FIG. 7 is a front view of a partial vertical cross section seen from the arrow A in FIG.

[Explanation of symbols]

1. Mold form for molding tubular concrete products
2 ... Outer frame 2a ... Gable plate 2s ... Side plate
3 ... Core frame 3a ... Toggle link mechanism 3a ... End side
4 ... Base 5 ... Slide base 5a, 5b ... Top position 6 ... Holding body 7 ... Arm
7b ... rear part 7c ... tip part 8 ... frame plate 9, 10 ... link member 9a, 10a ... both ends 11 ... expansion / contraction means 12 ... operating rod
12a / Male thread 12t / Tip 13 / Female thread
14 ・ ・ Abutting frame 15 ・ ・ Handle 16 ・ ・ Handle 20 ・ ・ Support shaft 20a ・ Tip
21..Holder 22..Bearing 23..Disc gear
24 ... Worm gear 25 ... Handle

Claims (4)

[Claims] 1. An outer frame (2) arranged on a base so that both side plates (2s) and both gable plates (2a) can be separated and assembled, and an outer frame (2) fixed in the outer frame (2). A molding frame for a tubular concrete product, comprising a core frame (3) which is arranged substantially horizontally with a vertical interval and is configured to be freely shrinkable, wherein the core frame (3) comprises: A core frame support mechanism that is supported in a cantilever state on a slide base (5) that is horizontally movable in the end plate direction along the base (4) of the outer frame (3). The child frame (3) is held substantially horizontally by a holding body (6) attached to one end side, and the holding body (6) is a link member (9) arranged at each of front and rear positions in the sliding direction. , 10) connected to the slide base (5) via both ends (9a, 10a) of the link member (9, 10).
Has a hinged connection that allows it to freely rotate in the sliding direction. Further, an operating rod (12) arranged substantially horizontally on the holding body (6) is screwed in the sliding direction. And the distal end portion (12t) of the operating rod (12) is caused to substantially vertically abut against the abutment frame (13) fixed on the slide base (5). A core frame support mechanism for forming a tubular concrete product. 2. The cylindrical concrete member according to claim 1, wherein at least one of the link members (9, 10) arranged at the front and rear positions in the sliding direction is provided with an expansion / contraction means (11). G Core frame support mechanism for product molding. 3. The attachment of the core frame (3) to the holding body (6) is characterized in that the core frame (3) and the holding body (6) are attached in an integrally fixed state. A core frame support mechanism for a tubular concrete product molding frame according to claim 1 or 2. 4. When attaching the core frame (3) to the holding body (6), the core frame (3) is held by the holding body such that the core frame (3) can rotate about a horizontal central axis (20). A driving means (23, 24) for axial rotation of the core frame (3) is provided in the holding body (6).
Alternatively, the core frame support mechanism of the cylindrical concrete product molding frame according to 2 above.