JP4629632B2 - Form for forming cylindrical concrete product and its inner mold - Google Patents

Description

  The present invention relates to an inner mold of a mold for molding a cylindrical concrete product whose one end is closed, such as a saddle block.

Forms for forming a cylindrical concrete product whose one end is closed are described in, for example, Japanese Patent Application Laid-Open Nos. 51-517 and 2004-114388. In the former, since the haunch is formed on the inner peripheral portion of the closed end face of the cylindrical concrete product, the inner peripheral wall can be reduced in diameter using this to release the cylindrical concrete product. In the latter case, the diameter of the top plate for forming the closed end face of the cylindrical concrete product is made smaller than the inner diameter of the cylindrical concrete product, and a rubber ring is fitted around it so that the mold can be removed even in the absence of the haunch. It is possible. The diameter of the inner mold peripheral wall is reduced by attaching a moving means such as a clamp to a support member such as a pillar provided in the inner mold, and directly pulling a part of the peripheral wall inward by this moving means.
JP-A-51-517 JP 2004-114388 A

  In the case of Patent Document 1, only a cylindrical concrete product having a haunch formed on the inner peripheral portion of the closed end face can be molded, and there is a problem that the range of concrete products that can be molded is extremely narrow. In the case of the above-mentioned Patent Document 2, there is no restriction on the cylindrical concrete product that can be molded. However, after the rubber ring is fitted around the top plate or removed from the inner peripheral portion of the closed end surface of the cylindrical concrete product, the rubber is inserted. There is a problem that the work of removing the ring is complicated. In either case, the inner mold has a built-in moving mechanism such as a clamp that pulls a part of the peripheral wall directly inward, and a support member that supports it. The cleaning of the Toro was not only difficult, but could not be applied to molds for molding relatively small tubular concrete products.

  An object of the present invention is to develop an inner mold for forming a cylindrical concrete product that can be easily removed even from a cylindrical concrete product that does not have a haunch on the inner peripheral portion of the closed end face. .

The present invention has a shape in which the upper end of the cylindrical peripheral wall is closed with a top plate,
The top plate is divided into a central part and a first peripheral part to a fourth peripheral part surrounding the central part.
The peripheral wall is divided into four peripheral wall division parts corresponding to the first peripheral part to the fourth peripheral part,
The first peripheral portion to the fourth peripheral portion and the peripheral wall dividing portion corresponding to each peripheral portion are integrated by joining the outer peripheral portion of the peripheral portion and the upper end portion of the peripheral wall dividing portion. It has become a part,
The central portion is vertically movable, and the first and second parts facing each other are inward and downward or outward and upward, and at least one of the third and fourth parts is movable inward and outward.
Moving means A for moving the central portion in the vertical direction;
A moving means B for moving the first and second parts facing each other inward and downward or outward and upward;
At the time of demolding, the moving means A moves the central part downward, the moving means B moves the first and second parts inward and downward to demold the cylindrical concrete product,
At the time of assembly, a mold for returning the peripheral wall and the top plate to the assembled state by moving the central part, the first and second parts in the opposite direction to the time of demolding by the moving means ,
The moving means B is a link piece arranged in a vertical direction by joining a hanging body formed by hanging from the lower surface of the central portion and the back surfaces of the first and second peripheral portions,
An overhanging portion projecting outward is formed at the lower part of the drooping body,
When the central portion moves downward, the link piece rotates in conjunction with this, and the first and second parts move inward and downward, and when the central portion moves upward, the link portion is interlocked. Then, when the link piece is rotated and the first and second parts are translated inward and downward, and the central portion is moved upward, the link piece is rotated in conjunction with the rotation. The overhanging part pushes up the first and second parts, and the first and second parts translate outward and upward, and are an inner mold of a cylindrical concrete product molding form.

  By moving the opposing first and second parts inward and downward, the positions of the first and second peripheral portions of the top plate integrated with these parts are lowered, and the remaining two third and second parts 4 The peripheral part can move inward, and the entire inner mold (the peripheral wall and the top plate) can be reduced in diameter.

The moving means B for moving the first and second parts inward and downward is a plurality of vertically arranged by joining the hanging body formed from the lower surface of the central portion of the top plate and the back surfaces of the first and second peripheral portions. Link pieces. When the central part moves downward, the link piece rotates in conjunction with this, the first and second parts translate inward and downward, and when the central part moves upward, The link piece rotates in the opposite direction, and the overhanging part pushes up the first and second parts, and the first and second parts translate outward and upward. Therefore, when the central part of the top plate is moved up and down by the moving means A, the first and second parts can be moved inward and downward or outward and upward in conjunction with this. In order to move the first and second parts inward and downward, an arbitrary guide mechanism such as a guide rail and a dedicated moving means can be provided, but if the link piece is used as described above, the first Forming a compact cylindrical concrete product that does not have a moving means such as a clamp that pulls the second part directly inward, and a support member that supports the moving part, thus simplifying the structure and cleaning the inside of the inner mold. Can also be applied. Further, since the first and second parts can be translated in a vertical state, the inner mold operates smoothly during demolding and assembly.

  In this case, when moving the central part of the top plate downward, it is possible to provide a biasing means for biasing upward so as to resist this. When moving the central part downward, the weights of the top plate, the suspended body, and the first and second parts act, and the central part tends to move downward in an accelerated manner. Can alleviate social movement. Further, when assembling the inner mold, the operation of moving the center part upward becomes easy.

  The mold can be removed if at least one of the third and fourth parts can move inward and outward. However, it is preferable that both can move inward and outward. After moving the first and second parts inward and downward, when the molded concrete product is pulled upward, the movable third and / or fourth parts are slightly inward due to the impact at that time. It moves and the entire inner mold is reduced in diameter. Therefore, the moving means for moving the third and fourth parts does not have to be specially provided, but can be provided. In this case, a known moving means such as a clamp or an air cylinder can be adopted as the moving means.

  In the present invention, the moving means A that moves the central portion of the top plate in the vertical direction can be a known clamping mechanism. The clamp mechanism is inexpensive and easy to operate. As a clamp mechanism, well-known things, such as the toggle clamp currently disclosed by the said patent document 2, the actual fair 4-10013 gazette, and the actual fair 5-9126 gazette, are employable, for example. Further, as the moving means A and B in the present invention, other well-known moving means such as a hydraulic cylinder, an air cylinder, a rack and pinion mechanism, a combination of bolts and nuts, a turnbuckle, etc. can be adopted.

  Further, the present invention provides a base, a ring-shaped bottom mold fixed on the base, and the inner mold according to any one of claims 1 to 5 provided on the base so as to be inscribed in the bottom mold. And a cylindrical outer mold provided so as to circumscribe the bottom mold, and cylindrical concrete is filled by filling concrete into a cylindrical cavity surrounded by the bottom mold, the inner mold and the outer mold. A formwork for forming a cylindrical concrete product characterized by forming a product.

  Since the inner mold in the present invention is reduced not only to the peripheral wall but also to the top plate at the time of demolding, it can be used for the production of a cylindrical concrete product having no haunch on the inner peripheral part of the closed end face, Since no rubber ring is used, demolding and assembly are easy.

  Hereinafter, the present invention will be described in detail with reference to the drawings showing examples. 1 is a plan view of the mold 1 of the embodiment, FIG. 2 is a sectional view of the mold 1, FIG. 3 is an exploded view of the inner mold 2 of the embodiment, and FIG. 4 is a plan view of the inner mold 2 in a reduced diameter state. 5 is an explanatory diagram of the first and second parts in a state where the inner mold 2 is assembled, FIG. 6 is an explanatory diagram of the first and second parts in a state where the inner mold 2 is reduced in diameter, and FIG. FIG. 8 is an exploded view of the outer mold 5, and FIG. 9 is an explanatory view of the clamp 24.

  The mold 1 is for molding a rectangular cylindrical concrete product whose one end is closed, and includes an inner mold 2 (example), an outer mold 5, a bottom mold 6 and a base 8. The inner mold 2 and the outer mold Concrete is filled in a square cylindrical cavity 7 surrounded by 5 and the bottom mold 6 to form a cylindrical concrete product with one end closed.

  The base 8 is assembled in a substantially rectangular shape with a steel material such as H-shaped steel or iron plate, on which the bottom mold 6, the inner mold 2 and the outer mold 5 are provided. The bottom mold 6 is obtained by processing an iron plate into a square ring shape, and is fixed on a base 8. The outer mold 5 is composed of four plates, and each frame plate is reinforced with a reinforcing material such as a flat bar on the outer surface of the iron plate. Each outer mold has a leg portion 22 slidably supported on the base 8, assembled as shown in FIG. 1, and fastened and fixed with a well-known fastener (not shown). When demolding, slide each outer mold outward. In the present invention, any method for removing the outer mold may be used, and the present invention is not limited to this embodiment.

  The inner mold 2 includes a square cylindrical peripheral wall 4 and a top plate 3 that closes the upper end thereof. The top plate 3 is divided into a central part 3d and a first peripheral part 3a, a second peripheral part 3b, a third peripheral part 3c and a fourth peripheral part 3d surrounding the central part 3d. Corresponding to each of these peripheral parts, the peripheral wall 4 is vertically divided into four parts, divided into a first peripheral wall split part 4a, a second peripheral wall split part 4b, a third peripheral wall split part 4c, and a fourth peripheral wall split part 4d. Yes. Each peripheral wall dividing portion is composed of an iron plate and an appropriate reinforcing member. As shown in FIG. 3, the peripheral part and peripheral wall division | segmentation part of a corresponding top plate are integrated by joining the outer peripheral part of a peripheral part, and the upper end part of a peripheral wall division | segmentation part by welding. That is, the first peripheral portion 3a and the first peripheral wall dividing portion 4a are integrated to form a first part α, the second peripheral portion 3b and the second peripheral wall dividing portion 4b are integrated to form a second part β, and a third peripheral portion. 3c and the third peripheral wall dividing portion 4c are integrated to form a third part γ, and the fourth peripheral portion 3d and the fourth peripheral wall dividing portion 4d are integrated to form a fourth part δ. The first part and the second part, and the third part and the fourth part are opposed to each other. The dividing positions of the peripheral wall and the outer periphery of the top plate are the same, and the dividing line of the top plate is formed inward from the divided portion of the first peripheral wall dividing portion 4a and the second peripheral wall dividing portion 4b, and the first periphery of the top plate The shapes of the part 3a and the second peripheral part 3b are formed so that the inside is slightly wider.

  The dividing position and shape of the top plate are not particularly limited as long as the diameter reduction of the inner mold is not hindered, but the dividing position on the outer periphery of the top plate is preferably matched with the dividing position of the peripheral wall. In the case of the present embodiment, the central portion 3d is a quadrilateral, but is not limited thereto, and may be a circle or a polygon. Further, the dividing lines of the first and second peripheral portions are preferably formed so that the same width or the inner side becomes wider toward the inside.

  The dividing position of the peripheral wall may be a portion that does not hinder the inner diameter reduction, but in the case of a rectangular tube shape, it is preferable to divide each peripheral wall dividing portion to include a corner. Moreover, it is desirable to make the first and second peripheral wall dividing portions smaller than the third and fourth peripheral wall dividing portions.

A hanging body 9 (iron plate) is suspended from the lower surface of the central portion 3e of the top plate by welding, and a plurality of back portions 11 of the first peripheral wall dividing portion 4a and the second peripheral wall dividing portion 4b are arranged in the vertical direction. The link pieces 10 are joined together. Each link piece 10 has one end pivotally attached to the hanging body 9 and the other end pivotally attached to the back surface portion 11. A projecting portion that projects outward is formed at the lower part of the hanging body 9, and a clamp receiving plate 25 is fixed to one end of the clamp 24 by a pin 28, and an operating shaft 26 of the clamp 24 is It is pivotally attached to a bearing plate 27 that is welded and fixed to the base 8 (FIG. 7). The clamp 24 is a moving means A that moves the central portion 3e in the vertical direction, and the link piece 10 is a moving means B that moves the first and second parts inward and downward or outward and upward. When the operation shaft 26 of the clamp 24 is rotated from the state shown in FIG. 5, the center part 3 e of the top plate and the hanging body 9 move downward until they contact the stopper 23. α and the second part β move inward and downward. This state is shown in FIG. In the drawing, the position of the first and second parts in the assembled state is indicated by a chain line, and the state in which the diameters of the first and second parts are reduced is indicated by a solid line. The stopper 23 is fixed to the base 8 by welding.

  As shown in FIG. 9, the clamp 24 includes an operating shaft 26, a rotating piece 29, and a connecting member 30. The rotating piece 29 is fixed to the operating shaft 26 by welding and rotates with the rotation of the operating shaft 26. The connecting member 30 has a rod shape with one end formed in a U-shape, the U-shaped tip is pivotally attached to the rotating piece 29 by a pin, and the other end is attached to the hanging body 9 to be moved by the clamp receiving plate 25. It is pivotally attached by a pin 28 through the pin.

  When the central portion 3e and the hanging body 9 are moved downward, biasing means (coil spring 13) for biasing upward is provided so as to resist this. The bolt 14 is fixed and erected on a receiving base 15 having a lower end welded to the base 8. The upper part of the bolt 14 is slidably inserted into the pipe 12 fixed to the hanging part 9. The coil spring 13 is provided so as to turn around the bolt 14, and an upper end thereof is in contact with a seat plate 17 fixed to the pipe 12, and a lower end thereof is in contact with a seat plate 16 fixed to the bolt 14.

  The third part γ and the fourth part δ are movable inward and outward by sliding on the base 8. No special moving means is provided, but guide means for surely returning to the original position after demolding and lifting prevention means for preventing the lifting and always keeping the vertical are provided. The guide means are a guide piece 18 and a guide pin 19. The guide piece 18 is welded and fixed to the lower surfaces of the first peripheral portion 3a and the second peripheral portion 3b of the top plate, and the guide pins 19 protrude downward from the lower surfaces of the third peripheral portion 3c and the second peripheral portion 3d of the top plate. Two pieces are fixed by welding. A hole 18a is formed in the portion of the guide piece 18 that protrudes on both sides from the first and second peripheral portions 3a and 3b, corresponding to the position of the guide pin 19, and the tip of the guide pin 19 engages with the hole 18a. ing. FIG. 1 shows a state where the inner mold 2 is assembled. When the first part α and the second part β move outward after the mold removal, the guide piece 18 also moves outward together with the first part α and the second part β, so that the guide pin 19 moves outward. As shown in FIG. 1, the third part γ and the fourth part δ are reliably returned to the predetermined original positions. The lifting prevention means is a bolt 20, a nut 50, and a guide hole 21 provided on the upper surface of the base 8. Bolts 20 are inserted into the lower surfaces of the third part γ and the fourth part δ through the bolt holes 31 so as to protrude downward from the lower surface, and the bolts 20 are inserted into the guide holes 21 provided on the upper surface of the base 8. The nut 50 is screwed from below. The guide hole 20 is a long hole and the nut 50 is loosely tightened so that the third part γ and the fourth part δ can slide inward and outward on the base. In this embodiment, both the third part γ and the fourth part δ are movable inward and outward. However, even if only one of the third part γ or the fourth part δ is movable, the concrete can be moved. The product can be demolded.

In order to reduce the diameter of the inner mold 2 at the time of demolding (removal of concrete product), the operation shaft 26 of the clamp 24 is rotated from the assembled state of FIGS. 1 and 5 to move the central portion 3e of the top plate downward. . Then, in conjunction with this, the first part α and the second part β move inward and downward (FIG. 6). In this case, when the operating shaft 16 is rotated a little, it moves naturally by its own weight, but slowly moves by the action of the urging means. When the concrete product formed in this state is pulled upward, the third and fourth parts move slightly inward due to the impact, and the concrete product can be smoothly extracted upward. At this time, the third and fourth parts are prevented from rising by the action of the floating prevention means, and are always kept in a vertical state. FIG. 4 shows the state of the inner mold at this time. However, in FIG. 4, the amount of movement of the third and fourth parts in the inner direction is emphasized. As described above, in the present invention, not only the peripheral wall but also the top plate is reduced in diameter during demolding. In order to assemble the inner mold 1 after demolding, the work opposite to that at the time of demolding may be performed. That is, when the operating shaft 26 is rotated in the opposite direction and the central portion 3e of the top plate is moved upward, the first part α and the second part β are moved outwardly and formed at the lower part of the hanging body. The formed overhanging part pushes up the lower ends of the first and second parts and moves upward. Further, the third part γ and the fourth part δ return to their original predetermined positions and return to the assembled state by the action of the guide means. In this case, the operation of moving the center portion upward can be easily performed by the action of the biasing means. In the present embodiment, the inner mold can be reduced in diameter or returned to the assembled state simply by rotating the operating shaft 26, so that the inner mold can be removed and assembled easily.

  In the present invention, the shape of the inner mold is not limited to a square tube shape, but may be a cylindrical shape, a polygonal tube shape, or the like. The inner mold 40 of the embodiment shown in FIG. 10 is an example of a cylindrical shape, and the top plate is a central portion 41, a first peripheral portion 42, a second peripheral portion 43, a third peripheral portion 44, and a fourth peripheral portion 45. The peripheral wall is divided into a first peripheral wall split part 46, a second peripheral wall split part 47, a third peripheral wall split part 48, and a fourth peripheral wall split part 49.

1 is a plan view of a formwork 1. 1 is a cross-sectional view of a mold 1. 3 is an exploded explanatory view of an inner mold 2. FIG. 3 is a plan view of the inner mold 2 in a reduced diameter state. FIG. It is explanatory drawing of the 1st, 2nd part of the state which assembled the inner mold | type 2. FIG. It is explanatory drawing of the 1st, 2nd part of the state which diameter-reduced the inner mold | type 2. FIG. 3 is a partially cutaway side view of an inner mold 2. FIG. FIG. 6 is an exploded explanatory view of the outer mold 5. It is explanatory drawing of the clamp 24. FIG. 2 is a plan view of an inner mold 40. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Formwork 2 Inner type | mold 3 Top plate 3a 1st peripheral part 3b 2nd peripheral part 3c 3rd peripheral part 3d 4th peripheral part 3e Center part 4 Peripheral wall 4a 1st surrounding wall division part 4b 2nd surrounding wall division part 4c 3rd surrounding wall Dividing part 4d Fourth peripheral wall dividing part 5 Outer mold 6 Bottom mold 7 Cavity 8 Base 9 Suspended body
9a Overhang portion 10 Link piece 11 Back portion 12 Pipe 13 Coil spring 14 Bolt 15 Receiving base 16 Seat plate 17 Seat plate 18 Guide piece 18a Hole 19 Guide pin 20 Bolt 21 Guide hole 22 Leg portion 23 Stopper 24 Clamp 25 Clamp receiving plate 26 Actuating shaft 27 Bearing 28 Pin 29 Rotating piece 30 Connecting member 31 Bolt hole 40 Inner mold 41 Central portion 42 First peripheral portion 43 Second peripheral portion 44 Third peripheral portion 45 Fourth peripheral portion 46 First peripheral wall dividing portion 47 Second peripheral wall dividing portion 48 Third peripheral wall dividing portion 49 Fourth peripheral wall dividing portion 50 Nut α First part β Second part γ Third part δ Fourth part

Claims (4)

The upper end of the cylindrical peripheral wall is closed with a top plate,
The top plate is divided into a central part and a first peripheral part to a fourth peripheral part surrounding the central part.
The peripheral wall is divided into four peripheral wall division parts corresponding to the first peripheral part to the fourth peripheral part,
The first peripheral portion to the fourth peripheral portion and the peripheral wall dividing portion corresponding to each peripheral portion are integrated by joining the outer peripheral portion of the peripheral portion and the upper end portion of the peripheral wall dividing portion. It has become a part,
The central portion is vertically movable, and the first and second parts facing each other are inward and downward or outward and upward, and at least one of the third and fourth parts is movable inward and outward.
Moving means A for moving the central portion in the vertical direction;
A moving means B for moving the first and second parts facing each other inward and downward or outward and upward;
At the time of demolding, the moving means A moves the central part downward, the moving means B moves the first and second parts inward and downward to demold the cylindrical concrete product,
At the time of assembly, a mold for returning the peripheral wall and the top plate to the assembled state by moving the central part, the first and second parts in the opposite direction to the time of demolding by the moving means ,
The moving means B is a link piece arranged in a plurality in the vertical direction by joining a hanging body formed hanging from the lower surface of the central portion and the back surfaces of the first and second peripheral portions,
An overhanging portion projecting outward is formed at the lower part of the drooping body,
When the central part moves downward, the link piece rotates in conjunction with this, and the first and second parts translate inward and downward, and when the central part moves upward, In conjunction with this, the link piece rotates, the overhanging part pushes up the first and second parts, and the first and second parts are translated outward and upward. The inner mold of the concrete product mold. 2. An inner mold according to claim 1 , further comprising biasing means for biasing upward so as to resist the center portion when moving downward. The inner type. The inner mold according to claim 1 or 2 , wherein the moving means (A) is a clamp mechanism. A base, a ring-shaped bottom mold fixed on the base, the inner mold according to any one of claims 1 to 3 provided on the base so as to be inscribed in the bottom mold, and the bottom mold And forming a cylindrical concrete product by filling concrete into a cylindrical cavity surrounded by the bottom mold, the inner mold and the outer mold. A formwork for forming cylindrical concrete products.

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