JP2004017462A - Inner mold for form apparatus and form apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To minimize the deformation level of an odd-shaped mold during scaling up and down an inner mold and improve the durability of the odd-shaped mold in the inner mold for the form apparatus for molding a formed concrete product such as a culvert, and the form apparatus. <P>SOLUTION: The inner mold A which is a constituent part of the form apparatus is equipped with an inner mold body 1, an odd-shaped form 2 and a scale-up and-down device 3. A gap fixing plate 34 is provided at the lower end part of a pick-up rod 32 of the scale-up and-down device 3, and a back-up member 35 is mounted on the gap fixing plate 34. The flexible odd-shaped mold 2 is attached to the back-up member 35 and is constituted of two mold components 20 which are fitted to the gap fixing plate 34 in a freely attachable/detachable manner. In addition, the odd-shaped mold 2 is tightly mounted on both sides of a scission part 10 without liquid leakage so that the scission part 10 of the inner mold body 1 is blocked from the outer face, and deformed while allowing the mold 2 to slide over the surfaces of both sides of the scission part 10, the gap of which narrows, when the inner mold body 1 is scaled down. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an inner formwork for a formwork device and a formwork device.
More specifically, the present invention relates to a method of molding a concrete secondary product such as a culvert, for example, in which a deformation amount of a deformable mold when expanding and contracting an inner mold is small, and durability can be improved.
Also, the present invention relates to an apparatus which can reduce the amount of movement of a member for backing up a deformable mold when enlarging or reducing an inner mold frame, and reduce the force required for the enlarging / reducing operation, thereby facilitating the operation.
[0002]
[Prior art]
2. Description of the Related Art In order to manufacture a cylindrical concrete secondary product such as an underdrain, a formwork apparatus having an inner formwork serving as a core is used. In such a formwork device, concrete is filled between the outer formwork and the inner formwork, and after the concrete has hardened to some extent, the thickness of the inner formwork is reduced to create a gap between the concrete form and the surface. Removed from concrete secondary products and removed.
[0003]
As a structure for reducing the thickness of the conventional inner mold, the inner mold body is formed in a substantially cylindrical shape with a deformable metal plate, and a part of the inner mold body in the circumferential direction is divided in the longitudinal direction. A movable part that provides a cut-off part, a plate-shaped rubber or metal deformable mold is stretched so as to cover the cut-off part, and the deformable mold is backed up inside the deformed mold during molding. It is common to provide a member.
[0004]
In this structure, at the time of reduction, the deformed mold is deformed inward into an inverted U-shaped cross section, at the same time, the backup member is moved inward, and the peripheral wall portion of the inner mold body is curved and deformed inward. The thickness is reduced.
[0005]
[Problems to be solved by the invention]
The inner mold having the above-mentioned conventional structure has the following problems.
That is, when the inner mold body is reduced, the deformable mold is deformed inward into an inverted U-shaped cross section, so that the deformation amount of the deformable mold accompanying the expansion and contraction is large. Therefore, the deformation type has a problem in durability due to damage of the material caused by repetitive deformation, which progresses in a short period of time.
[0006]
Further, the backup member for performing the deformed backup needs to be largely moved inward so as not to obstruct the deformable mold that is deformed inward into an inverted U-shaped cross section when the inner mold body is reduced. For this reason, the operation stroke of the operation unit becomes large in order to secure the movement amount, so that the operation is difficult.
[0007]
(Object of the present invention)
SUMMARY OF THE INVENTION An object of the present invention is to reduce the amount of deformation of a deformable mold when expanding and contracting an inner mold in an inner form for a formwork apparatus and a formwork apparatus for molding a secondary concrete product such as a culvert. That is, durability can be improved.
[0008]
Another object of the present invention is to reduce the amount of movement of a backup member for backing up a deformable mold when enlarging or reducing an inner mold frame, thereby reducing the force required for the enlarging / reducing operation and facilitating the operation. .
[0009]
[Means for Solving the Problems]
Means of the present invention taken to achieve the above object are as follows.
In the first invention,
The inner frame body, which is essentially formed in a cylindrical shape, is configured to be capable of reducing and deforming by providing a dividing portion at a required width over a part of the peripheral surface over the entire length in the longitudinal direction, and the dividing portion has flexibility. A plate-shaped deforming mold having the partitioning portion is provided so as to be in close contact with the peripheral surfaces on both sides of the dividing portion so as to cover the dividing portion in a liquid-tight state and to be slidable on the peripheral surface,
The deformed mold is characterized in that when the inner mold body is reduced and deformed, and when it is returned to the normal state, it slides on the peripheral surface and deforms while maintaining a liquid-tight state.
It is an inner mold for a mold apparatus.
[0010]
In the second invention,
The inner frame body, which is essentially formed in a cylindrical shape, is configured to be capable of reducing and deforming by providing a dividing portion at a required width over a part of the peripheral surface over the entire length in the longitudinal direction, and the dividing portion has flexibility. A plate-shaped deforming mold having the partitioning portion is provided so as to be in close contact with the peripheral surfaces on both sides of the dividing portion so as to cover the dividing portion in a liquid-tight state and to be slidable on the peripheral surface,
The deformable mold is configured to be deformed without sliding into the inside of the divided part while sliding the peripheral surface and maintaining the liquid-tight state when reducing and deforming the inner frame body, and when returning to the normal state. Characterized by the fact that
It is an inner mold for a mold apparatus.
[0011]
In the third invention,
The inner mold body has, on the peripheral surfaces on both sides sandwiching the dividing portion, a portion that can be deformed inward when the inner mold body is reduced and deformed,
It is an inner mold for a mold apparatus according to the first or second invention.
[0012]
In the fourth invention,
The modified mold is characterized in that it is configured to be removable from the outside of the inner mold,
It is an inner mold for a mold apparatus according to the first, second or third invention.
[0013]
In the fifth invention,
On the peripheral surfaces on both sides of the dividing portion, packing is provided to maintain a liquid-tight state between the deformation mold,
It is an inner mold for a mold apparatus according to the first, second, third or fourth invention.
[0014]
In the sixth invention,
The inner frame body, which is essentially formed in a cylindrical shape, is configured to be capable of reducing and deforming by providing a dividing portion at a required width over a part of the peripheral surface over the entire length in the longitudinal direction, and the dividing portion has flexibility. A plate-shaped deforming mold having the partitioning portion is provided so as to be in close contact with the peripheral surfaces on both sides of the dividing portion so as to cover the dividing portion in a liquid-tight state and to be slidable on the peripheral surface,
The inner form body has a built-in backup member that moves inward when the inner form body shrinks and deforms, and moves outward when the inner form body returns to the normal state,
The deformed mold is divided in the width direction of the dividing portion, and the divided deformed mold is detachably fixed to a backup member. , And is deformed while maintaining a liquid-tight state,
It is an inner mold for a mold apparatus.
[0015]
In the seventh invention,
An outer formwork for a formwork device,
An inner mold for a mold apparatus according to the first, second, third, fourth, fifth or sixth invention.
It is a formwork device.
[0016]
The cross-sectional shape of the outer peripheral surface (molding surface) of the inner form body is appropriately set in accordance with the shape of the concrete secondary product to be manufactured, and is not particularly limited. For example, the shape may be a quadrangle including a trapezoid or a rhombus, other polygons, a circle, an ellipse, or an irregular shape not belonging to them.
[0017]
(Action)
The present invention operates as follows.
Since the deformation mold provided on the inner mold frame is provided so as to be in close contact with the peripheral surfaces on both sides of the dividing portion with the dividing portion therebetween and to cover the dividing portion in a liquid-tight manner and to be slidable on the peripheral surface. When manufacturing a secondary concrete product, moisture does not enter the interior.
[0018]
When removing the inner mold, the thickness of the inner mold body of the inner mold is reduced and deformed. When contracting and deforming the inner frame body, an operation unit for enlargement / reduction is operated, and both sides of the dividing portion of the inner frame body are pulled inward to be deformed inward.
As a result, the interval between the divided portions is reduced, and the angles of the peripheral surfaces on both sides of the divided portion are changed. The deformable mold that is in close contact with the peripheral surface slides and deforms while changing its relative position with respect to the peripheral surfaces on both sides of the dividing portion. That is, since the close contact between the deformable mold and the peripheral surfaces on both sides of the dividing portion is maintained, the liquid-tight state is maintained.
[0019]
The deformable mold is provided so as to overlap the peripheral surfaces on both sides of the dividing portion provided on the inner mold body. In addition, when the deformable mold is pulled inward on both sides of the divided portion of the inner mold body and the angles of the surfaces on both sides of the divided portion change, and when the deformed shape is deformed accordingly, relative to the surfaces on both sides of the divided portion. The bending deformation occurs while changing the position, in other words, while sliding the contact surface. Then, when the inner mold body returns to the normal state, the edge of the deformable mold slides so as to wipe off dirt on the surfaces on both sides of the dividing part.
[0020]
When the deforming mold shrinks and deforms the inner frame body, and when returning to the normal state, the one that slides on the peripheral surface and deforms without entering the inside from the dividing part while maintaining the liquid-tight state, Even when the deformed mold is deformed, the deformed mold is always located on the outer side of the dividing part and is not drawn into the dividing part. Therefore, for example, it is not necessary to largely move the backup member for backing up the deformed mold inward to escape. Accordingly, the amount of movement of the backup member can be reduced, so that the force required for the enlarging / reducing operation can be reduced, and the operation becomes easier.
Then, the thickness of the inner form body is reduced and a gap is formed between the inner form body and the surface of the concrete secondary product, so that the inner form can be removed.
[0021]
On the peripheral surface on both sides of the dividing part, a part that can be deformed inward when the inner form body is reduced and deformed is provided, for example, the dividing part is provided on the lower side of the inner form body. In this case, the amount of clearance in the vertical direction (gap with the molding surface of the concrete secondary product) can be ensured without significantly deforming both sides of the inner form body inward.
Therefore, a link mechanism or the like for moving the both sides of the inner frame body largely inward is not required, and the structure of the inner frame can be simplified.
[0022]
If the deformation mold is configured to be removable from the outside of the inner mold, when the deformation mold deteriorates and replacement becomes necessary, the replacement work is easy and short without disassembling the inner mold. You can do it in time.
[0023]
When the packing for maintaining a liquid-tight state with the deformable mold is provided on both peripheral surfaces of the divided portion of the inner mold body, the liquid-tight function can be further improved.
[0024]
The deformable mold is divided in the width direction of the dividing portion, and the one that is detachably fixed to the backup member is divided, so that the surface area of each mold is reduced and the strength is improved. This makes it less likely that the deformed surface will undulate. Further, since the deformable mold is detachably fixed to the backup member, the replacement of the deformable mold can be performed easily and in a short time without disassembling the inner mold.
[0025]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention will be described in more detail based on the embodiments shown in the drawings.
Fig. 1 shows an embodiment of an inner mold according to the present invention. The left half shows an enlarged state of the inner mold body, and the right half shows a contracted state in a longitudinal direction. Explanatory diagram,
FIG. 2 is a side view of the inner mold, FIG. 2A is an explanatory view showing an enlarged state of the inner form body, FIG.
FIG. 3 is an explanatory diagram showing an enlarged state of the inner form body by cross-section of the inner form in the width direction;
FIG. 4 is an enlarged explanatory view of a deformable portion corresponding to FIG.
FIG. 5 is an explanatory view showing a reduced state of the inner form body by sectioning the inner form in the width direction;
FIG. 6 is an enlarged explanatory view of a deformable portion corresponding to FIG.
[0026]
The inner formwork A is used for a formwork apparatus for forming a secondary concrete product such as a culvert.
The inner mold A is formed of a metal plate having an appropriate flexibility (spring property) (a steel plate, stainless steel, or the like, but other metal materials can be used). It has a mold body 1. The peripheral surface (outer surface) of the inner mold body 1 is a mold surface (molding surface). As shown in FIG. 2, the cross-sectional shape of the inner mold body 1 is substantially hexagonal although it is irregular in the set state.
On the lower side of the inner mold body 1 in FIG. 2, a dividing portion 10 having a required width is provided over the entire length of the inner mold body 1. The width of the dividing portion 10 is appropriately set according to the shape and size of the inner frame main body 1.
[0027]
A plurality of upper reinforcing ribs 11 are provided at an upper portion on the inner side of the inner frame main body 1 at required intervals in the longitudinal direction of the inner frame main body 1, and side reinforcing ribs 12 are provided on both sides on the inner side. Similarly, a plurality is provided. Each upper reinforcing rib 11 and each side reinforcing rib 12 are provided at the same position in the longitudinal direction of the inner form body 1.
At the center of each upper reinforcing rib 11, a bearing portion 110 into which an operation shaft 30 described later is inserted is provided. Insert holes 111 for inserting a lifting member (not shown) used for lifting the inner formwork A are provided at both lower end sides of each upper reinforcing rib 11.
[0028]
Eight pivot arm plates 13 (two pivot arm plates 13a at both ends) are provided on both sides of the dividing portion 10 in the circumferential direction of the inner form body 1 with a required interval in the longitudinal direction of the inner form body 1. Is included). A shaft hole 130 through which the shaft rod 37 is inserted is provided at the tip of each rotating arm plate 13.
[0029]
As shown in FIG. 2, the rotating arm plates 13a at both ends in the longitudinal direction of the inner frame main body 1 have gears (meshing teeth) 131 at the respective ends, and the rotating arm plates 13 on both sides are provided. The gear 131 of 13a is meshed. With this structure, both sides of the dividing portion 10 are interlocked (simultaneously move) when the inner mold body 1 is expanded or contracted.
[0030]
At both ends of the upper reinforcing ribs 11 and the side reinforcing ribs 12 and at the outer ends of the rotating arm plates 13 and 13a, connecting members 14 are provided to connect and reinforce each of them in the longitudinal direction of the inner mold body 1. is there.
[0031]
At the inner ends of the rotating arm plates 13 and 13a, there is provided a connecting member 15 for connecting and reinforcing each of them in the longitudinal direction of the inner form body 1. The connecting members 15 are formed slightly thicker than the respective connecting members 14. A groove 150 is provided on the lower surface side of the connecting member 15 over the entire length, and a rubber packing 151 is mounted in the groove 150.
[0032]
The upper reinforcing ribs 11, the side reinforcing ribs 12, and the rotating arm plates 13 and 13a are provided independently, and there is a portion between the connecting members 14 where no reinforcing ribs are provided. Therefore, a curved portion P1, P2, P3, P4 (a total of four portions) of the inner mold body 1 that can be deformed in an inward direction when the inner mold body 1 contracts is reduced. Section).
[0033]
The deformable mold 2 having flexibility (spring property) is detachably attached to the dividing section 10 side of the inner frame body 1 so as to cover the dividing section 10 from the outer surface side. The structure of the deformable mold 2 and the structure for attaching it to the inner mold body 1 will be described later in detail.
[0034]
The enlargement / reduction operation of the inner mold body 1 is performed by the enlargement / reduction device 3.
The expansion / contraction device 3 is provided inside the inner frame main body 1, and includes an operation shaft 30 that is slightly longer than the entire length of the inner frame main body 1. The operating shaft 30 is provided so as to be rotatable in the axial direction by passing through the bearing portion 110 of each of the above-described upper reinforcing ribs 11. At both ends of the operation shaft 30, insertion tubes 300 through which rod-shaped handles (not shown) are inserted are provided.
[0035]
Pull-up arms 31 are provided at two positions near both ends of the operation shaft 30. The lifting arm 31 has a pair of arm members 310. Each of the arm members 310 is provided with a base end fixed to the operation shaft 30 at a predetermined interval, and the operation shaft 30 is divided between the arm members 310.
[0036]
A pulling shaft 311 is provided between the tip portions of the arm members 310. The lifting rod 32 is connected to the lifting shaft 311.
The lifting rod 32 includes a bolt shaft 320 and end members 321 and 322 screwed to both ends thereof. A nut 323 for rotating operation is fixed to the center of the bolt shaft 320. The threaded portions (symbols omitted) provided on both ends of the bolt shaft 320 are reverse-threaded. The length of the pull-up rod 32 can be adjusted by rotating the nut 323 to rotate the bolt shaft 320, thereby moving the non-rotating end members 321 and 322 in directions approaching and moving away from each other. Note that reference numeral 324 is a lock nut.
[0037]
The pull-up rod 32 is rotatably fitted into a pull-up shaft 311 with a shaft hole 325 provided in an upper end member 321 and connected thereto. A shaft hole 326 through which the shaft rod 38 is inserted is provided in the end member 322 on the lower side of the pulling rod 32.
The interval fixing plate 34 is rotatably connected to the end member 322 via a shaft rod 38. The space fixing plates 34 are provided on a bearing tube 39 described later, and are disposed at two places on both front and rear sides of the end member 322.
[0038]
Two shaft rods 37 are inserted into the shaft holes 130 from the both ends in the longitudinal direction of the inner frame body 1 (the side of the rotation arm plate 13a) in the rotation arm plate 13 and the rotation arm plate 13a. I have.
A bearing tube 39 is fitted into each of the inserted shaft rods 37 at two locations (at locations corresponding to the pull-up rods 32) so as to be rotatable in the axial circumferential direction.
As described above, in each bearing tube 39, two interval fixing plates 34 are provided in parallel at positions sandwiching the end member 322 of each pull-up rod 32 with a required gap. Each spacing fixing plate 34 is fixed so as to bridge the bearing tube 39 adjacent on both sides.
[0039]
A shaft hole 340 for inserting the shaft rod 38 is provided on the upper side of the gap fixing plate 34, and a shaft hole 341 for inserting the shaft rod 37 is provided at a slightly lower position on both sides of the gap fixing plate 34. .
A deformable mold 2 is attached to the lower side of the spacing fixing plate 34, and a backup member 35 for backing up the deformable mold 2 is fixed thereto. The backup member 35 is provided over the entire length of the dividing section 10.
[0040]
The structure of the deformable mold 2 provided so as to close the dividing portion 10 from the outer surface side and the structure of attachment to the inner mold body 1 will be mainly described with reference to FIGS.
On the lower surface side of the backup member 35, a fixing groove 350 is provided over the entire length. The fixing groove 350 has a trapezoidal cross-sectional shape in which the back side (upper side) is slightly depressed. A plurality of screw holes 351 are provided at required intervals in the upper bottom portion of the fixing groove 350.
[0041]
A fixing member 352 having the same length as the fixing groove 350 and a substantially trapezoidal cross section is fixed to the fixing groove 350. The holding member 352 is provided with a through hole 353 for a countersunk screw at a position corresponding to the screw hole 351. The pressing member 352 can be fixed to the fixing groove 350 by passing a screw 354 into each through hole 353 and screwing it into each screw hole 351. On both sides on the wide side (lower side) of the holding member 352, a holding portion 355 is provided over the entire length. The pressing portion 355 is curved so that the outer surface side is along the outer surface side of a bent portion of the mold component 20 described later (see FIGS. 4 and 6), and an end side portion is provided so as to slightly project.
[0042]
The deformation mold 2 is detachably fixed to the fixing groove 350. The modified mold 2 is composed of two mold members 20 having the same shape. The mold structure 20 is formed of a metal having relatively strong flexibility (spring properties). Since the deformable mold 2 is divided into two mold components 20, the surface area of each mold is reduced, and the strength is improved. This makes it less likely that the surface of the deformable mold 2 will undulate.
[0043]
The mold structure 20 has a shape in which a band plate having a length substantially equal to the length of the dividing portion 10 and having a required width is bent substantially at a right angle (for example, an inner angle of 92 to 93 °) over the entire length near one end. Thus, a narrow fixed portion 201 and a wide mold portion 202 are formed. The edge of the mold portion 202 is formed obliquely in the thickness direction so that the contact side with the inner mold body 1 is sharpened.
[0044]
As shown in FIGS. 4 and 6, each mold component 20 is fixed to both sides of the fixing groove 350 by firmly tightening the screw 354 such that the fixing portion 201 is sandwiched between the fixing groove 350 and the pressing member 352. It is. In addition, the corners of the mold forming body 20 are pressed by the pressing portions 355 of the pressing member 352 to prevent the angle from spreading.
[0045]
The mold portion 202 of the mold structure 20 is provided with a habit (spring back) so as to warp upward in the drawing. As a result, the edge of the mold portion 201 of each mold structure 20 adheres strongly to the peripheral surfaces (surfaces) on both sides of the dividing portion 10 of the inner mold body 1 while being free ends, and the action of the packing 151 described above is also achieved. Together, the liquid-tightness of the dividing parts 10 can be maintained.
In the present embodiment, the deformable mold 2 is divided into two mold members 20 in the width direction. However, the deformable mold 2 may be integrally formed. It can be divided into a plurality in the length direction.
[0046]
Since the length of the pull-up rod 32 can be adjusted as described above, if the height of the backup member 35 is adjusted, the surface shape (flatness) of the deformable mold 2 when the inner mold body 1 is expanded and deformed is adjusted. it can.
[0047]
FIG. 7 is a perspective view showing the structure of the formwork device according to the present invention.
The structure of the form device M will be described with reference to FIG.
The formwork device M is configured by combining the outer formwork B and the inner formwork A. The outer frame B includes a frame 4, outer frames 5 and 5 a having lower ends rotatably provided on both sides in the width direction thereof, and end plates 6 and 6 a provided on both sides in the longitudinal direction of the frame 4. It has.
And, inside the outer formwork B, the inner formwork A is attached so as to bridge between the end plates 6, 6a. As a result, a mold space 7 is formed inside the outer mold frame B.
Reference numeral 8 denotes a clamp device for opening and closing the outer frames 5, 5a and the end plates 6, 6a.
[0048]
(Action)
With reference to FIGS. 1 to 7, the operation of the inner mold according to the present embodiment and the mold apparatus having the same will be described. The mold apparatus M including the inner mold A and the outer mold B according to the present invention operates as follows.
[0049]
(1) The mold apparatus M is assembled by combining the inner mold A and the outer mold B, and the inner mold A is set in a set state (an enlarged state as shown in FIG. 3).
(2) Concrete is poured into the mold space 7 between the outer mold B and the inner mold A, cured for a certain period, and solidified to a predetermined hardness. The moisture of the concrete until it is dried or solidified does not leak to the inner side of the inner mold A due to the liquid-tight action of the deformation mold 2.
[0050]
(3) When the concrete has hardened to a predetermined hardness, a handle (not shown) is attached to the insertion tube 300 provided at the front end of the operation shaft 30 of the expansion and contraction device 3, and the handle is turned to move the operation shaft 30 in a predetermined direction. (In FIG. 3, left rotation direction). As a result, the lifting rod 32 starts to rise, and accordingly, the spacing fixing plate 34 and the backup member 35 rise.
[0051]
(4) At the same time, the bearing tube 39 and the shaft rod 37 are pulled upward. Accordingly, the rotating arm plates 13 and 13a on both sides rotate inward around the respective shaft rods 37 while being linked by the gear 131. As a result, both side edges of the inner frame main body 1 forming the dividing portion 10 are brought inward, and the inner frame main body 1 is reduced (see FIG. 5). Then, the diameter becomes the minimum when the operation shaft 30 is rotated by almost half.
[0052]
(5) When the inner frame body 1 is reduced, the curved portions P1, P2, P3, and P4 of the inner frame body 1 are deformed as shown in FIG. In particular, when the curved portions P3 and P4 provided on both sides of the dividing portion 10 in the circumferential direction of the inner form body 1 are deformed, the vertical clearance on both sides of the dividing portion 10 (the molding surface of the concrete secondary product). Can be secured without significantly deforming both sides of the inner frame body 1 inward.
[0053]
(6) The deformable mold 2 is provided on the peripheral surface on both sides of the dividing portion 10 of the inner mold body 1, and the both sides of the dividing portion 10 of the inner mold body 1 are drawn inward to change the angle. At the time of the deformation, the bending deformation occurs while changing the relative position with respect to the peripheral surface on both sides of the dividing portion 10, in other words, while sliding the contact surface (see FIGS. 5 and 6). Then, when the inner mold body 1 returns to the normal state, the edges of the deformable mold 2 (edges of the respective mold components 20) scrape off the dirt on the peripheral surfaces on both sides of the dividing portion 10 ( Slide as if cleaning).
[0054]
As described above, the deformable mold 2 is always located outside the dividing portion 10 even when deformed, and does not have a structure to be drawn into the dividing portion 10. That is, since the backup member 35 is not largely moved inward, the force required for the expansion / contraction operation can be reduced as compared with the conventional inner mold frame, and the operation becomes easier.
[0055]
Further, the deformable mold 2 has a small deformation amount at the time of expansion and contraction. Accordingly, the deformable mold 2 is less likely to cause metal fatigue due to repeated deformation, and is excellent in durability. Further, the deformation mold 2 can be made relatively thick because the deformation amount is small, and the durability can be improved also in this regard.
Furthermore, since the edge of the deformation mold 2 overlaps the surface of the inner mold body 1 and is a so-called free end, there is an advantage that dimensional accuracy is not so much required and it is easy to manufacture.
[0056]
(7) As the thickness of the inner mold body 1 is reduced, a gap is generated between the outer surface of the inner mold body 1 and the inner surface of the secondary concrete product. Thereby, the inner mold A can be extracted.
(8) By operating the clamp device 8, the outer frames 5, 5a and the end plates 6, 6a are fallen outward, and the concrete secondary product is released from the outer frame B. Further, after a predetermined curing period, a final concrete secondary product is obtained.
[0057]
For example, if the mold member 20 of the deformable mold 2 is deteriorated due to metal fatigue or the like due to long-term use, it is necessary to replace the mold member 20 before liquid leakage or waving of the surface of the concrete secondary product occurs. The replacement of the deformable mold 2 can be easily performed by attaching and detaching the pressing member 352. The packing 151 can be easily replaced by removing the deformable mold 2 in the same manner.
In addition, since the opening part is formed in both ends of the inner mold body 1 in the length direction of the dividing part 10, it is desirable to provide a plug (not shown) so as to close this opening part. Thereby, it is possible to prevent foreign matters such as sand and concrete chips from entering the inside of the inner mold A.
[0058]
The terms and expressions used herein are illustrative only and not intended to be limiting, and are not intended to exclude terms or expressions that are equivalent to the features described herein. It goes without saying that various modifications are possible within the scope of the technical idea of the present invention.
[0059]
【The invention's effect】
(A) The deformation mold provided in the inner mold has a small amount of deformation at the time of expansion and contraction. Therefore, the deformation type is less likely to cause metal fatigue due to repeated deformation, and is excellent in durability. Further, since the deformation type has a small deformation amount, it can be made relatively thick, and in this respect, the durability can be improved.
Furthermore, since the edge of the deformable mold overlaps the surface of the inner mold body and is a so-called free end, there is an advantage that dimensional accuracy is not so required and it is easy to manufacture.
[0060]
(B) When the deformable mold shrinks and deforms the inner frame main body and returns to the normal state, the deformable mold slides on the peripheral surface and deforms without entering the inside from the dividing portion while maintaining a liquid-tight state. When the deformed mold is deformed, it is always located on the outside of the dividing part and is not drawn into the dividing part, so for example, it is necessary to move the backup member that backs up the deformed part largely inward to escape There is no. Accordingly, the amount of movement of the backup member can be reduced, so that the force required for the enlarging / reducing operation can be reduced, and the operation becomes easier.
[0061]
(C) In the case where a portion capable of being deformed inward when the inner mold body is reduced and deformed is provided on the peripheral surfaces on both sides of the dividing portion, for example, the dividing portion is located at a lower portion of the inner mold body. When provided on the side, the amount of clearance in the vertical direction (gap with the molding surface of the secondary concrete product) can be secured without significantly deforming both sides of the inner form body inward.
Therefore, a link mechanism or the like for moving the both sides of the inner frame body largely inward is not required, and the structure of the inner frame can be simplified.
[0062]
(D) In the case where the deformable mold is configured to be detachable from the outside of the inner mold, when the deformable mold deteriorates and needs to be replaced, the replacement operation is easy without disassembling the inner mold. In a short time.
[0063]
(E) In the case where packings for maintaining a liquid-tight state with the deformable mold are provided on both peripheral surfaces of the divided portion of the inner mold body, the liquid-tight function can be further improved.
[0064]
(F) When the deformable mold is divided in the width direction of the dividing portion and is detachably fixed to the backup member, the surface area of each mold is reduced by dividing so that the strength is improved. I do. This makes it less likely that the deformed surface will undulate. Further, since the deformable mold is detachably fixed to the backup member, the replacement of the deformable mold can be performed easily and in a short time without disassembling the inner mold.
[Brief description of the drawings]
FIG. 1 shows an embodiment of an inner mold according to the present invention, wherein a left half shows an enlarged state of the inner mold body, and a right half shows a contracted state in a longitudinal direction. Explanatory drawing.
FIGS. 2A and 2B are side views of the inner mold frame, wherein FIG. 2A is an explanatory view showing an enlarged state of the inner form body, and FIG.
FIG. 3 is an explanatory view showing an enlarged state of the inner form body by cross-section of the inner form in a width direction.
FIG. 4 is an enlarged explanatory view of a deformable portion corresponding to FIG. 3;
FIG. 5 is an explanatory view showing a reduced state of the inner form body by sectioning the inner form in the width direction.
FIG. 6 is an enlarged explanatory view of a deformable portion corresponding to FIG.
FIG. 7 is a perspective view showing the structure of a formwork device according to the present invention.
[Explanation of symbols]
M formwork device
B Outer formwork
A Inner formwork
1 Inner formwork body
10 division
11 Upper reinforcement rib
12 Side reinforcement ribs
110 Bearing
111 insertion hole
13, 13a Rotating arm plate
130 Shaft hole
131 gear
14 Connecting member
15 Connecting members
150 groove
151 packing
P1, P2, P3, P4 curved part
2 deformation type
20 type structure
201 Fixed part
202 type part
3 expansion and contraction device
30 Operation axis
300 insertion tube
31 Lift arm
310 arm member
311 Pulling shaft
32 Lifting rod
320 bolt shaft
321,322 End member
323, 324 nut
325 shaft hole
326 shaft hole
34 interval fixing plate
340 shaft hole
341 Shaft hole
35 Backup material
350 Groove for fixing
351 screw hole
352 Holding member
353 through hole
354 screws
355 Holder
37 axis rod
38 shaft rod
39 Bearing tube
4 frame
5, 5a Outer frame
6, 6a
7 type space
8 Clamping device

Claims (7)

The inner frame body, which is essentially formed in a cylindrical shape, is configured to be capable of reducing and deforming by providing a dividing portion at a required width over a part of the peripheral surface over the entire length in the longitudinal direction, and the dividing portion has flexibility. A plate-shaped deforming mold having the partitioning portion is provided so as to be in close contact with the peripheral surfaces on both sides of the dividing portion so as to cover the dividing portion in a liquid-tight state and to be slidable on the peripheral surface,
The deformed mold is characterized in that when the inner mold body is reduced and deformed, and when it is returned to the normal state, it slides on the peripheral surface and deforms while maintaining a liquid-tight state.
Inner formwork for formwork equipment. The inner frame body, which is essentially formed in a cylindrical shape, is configured to be capable of reducing and deforming by providing a dividing portion at a required width over a part of the peripheral surface over the entire length in the longitudinal direction, and the dividing portion has flexibility. A plate-shaped deforming mold having the partitioning portion is provided so as to be in close contact with the peripheral surfaces on both sides of the dividing portion so as to cover the dividing portion in a liquid-tight state and to be slidable on the peripheral surface,
The deformable mold is configured to be deformed without sliding into the inside of the divided part while sliding the peripheral surface and maintaining the liquid-tight state when reducing and deforming the inner frame body, and when returning to the normal state. Characterized by the fact that
Inner formwork for formwork equipment. The inner mold body has, on the peripheral surfaces on both sides sandwiching the dividing portion, a portion that can be deformed inward when the inner mold body is reduced and deformed,
An inner mold for a mold apparatus according to claim 1 or 2. The modified mold is characterized in that it is configured to be removable from the outside of the inner mold,
The inner formwork for a formwork device according to claim 1, 2 or 3. On the peripheral surfaces on both sides of the dividing portion, packing is provided to maintain a liquid-tight state between the deformation mold,
The inner formwork for a formwork device according to claim 1, 2, 3, or 4. The inner frame body, which is essentially formed in a cylindrical shape, is configured to be capable of reducing and deforming by providing a dividing portion at a required width over a part of the peripheral surface over the entire length in the longitudinal direction, and the dividing portion has flexibility. A plate-shaped deforming mold having the partitioning portion is provided so as to be in close contact with the peripheral surfaces on both sides of the dividing portion so as to cover the dividing portion in a liquid-tight state and to be slidable on the peripheral surface,
The inner form body has a built-in backup member that moves inward when the inner form body shrinks and deforms, and moves outward when the inner form body returns to the normal state,
The deformed mold is divided in the width direction of the dividing portion, and the divided deformed mold is detachably fixed to a backup member. , And is deformed while maintaining a liquid-tight state,
Inner formwork for formwork equipment. An outer formwork for a formwork device,
An inner mold for a mold apparatus according to claim 1, 2, 3, 4, 5, or 6,
Characterized by having
Formwork equipment.

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