Formwork for concrete products

Abstract

To provide a molding framework of concrete products capable of molding a plurality of concrete products at the same time and safely and easily performing a molding operation in small groups.SOLUTION: A molding framework 1 comprises: plural middle frames 20 movable in a longitudinal direction of a trestle 10; a pair of right and left side plates 50 movable right and left with respect to the respective middle frames 20; partition plates 40 provided between the middle frames 20 and supported by the middle frames 20; and a front end plate 30a and a rear end plate 30b provided at a front end part and a rear end part respectively and movable in a longitudinal direction with respect to the middle frames 20. By making lock mechanisms provided at the pair of right and left side plates into a lock state, the side plates 50 are fixed to the middle frames 20, and by tightening the end plate clamps 30 of the front end plate 30a and the rear end plate 30b connected with a connection member passing through the inside of all the middle frames 20, fixing is performed in a state where the front end plate 30a, the rear end plate 30b, the plural middle frames 20 and the partition plates 40 are integrated to execute the assembly of the molding framework 1.SELECTED DRAWING: Figure 1

Description

Technical Field

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[0001] The present invention relates to a molding die capable of molding a plurality of products simultaneously in the manufacture of precast concrete products such as portal members and inverted portal (U-shaped) members.

Background Art

[0002] Precast concrete products having an opening at the upper side and laid by connecting a plurality of them in the longitudinal direction, such as water channels and side grooves, are manufactured by arranging a plurality of assembled molds on the gantry of the flow line and continuously pouring concrete into those molds for molding, so that a large number of products can be manufactured efficiently and quickly.

[0003] After curing, the molds are taken out of the curing tank and the precast concrete products are demolded one by one by opening the molds. After demolding, the molds are assembled again and the operation of pouring the next concrete is repeated. Therefore, time and labor are required for the molding operation of precast concrete products.

[0004] Therefore, in order to obtain a plurality of precast concrete products in one molding operation, precast concrete products are manufactured using a mold provided with a plurality of partition plates. However, in that case, the mold itself becomes long, and a large amount of labor is required for the operation of removing the left and right side plates in the demolding operation. Therefore, a structure of a mold that allows an operator to perform the demolding operation safely and easily has been demanded.

[0005] And, in order for an operator to perform the demolding operation safely and easily, the following types of molds in which mold assembly and mold opening are automated have been proposed.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

[0007] However, these formwork structures, which include lifting devices and actuators equipped with hydraulic cylinders, were costly, difficult to operate due to their complex structure, and required intricate mechanical adjustments. Furthermore, the structure involved lifting and lowering heavy side panels during formwork assembly and unfolding, making it difficult to ensure the safety of the workers. [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] Therefore, in order to solve the conventional problems described above, the present invention provides a molding formwork that can produce multiple precast concrete products in a single molding operation, has a simple structure, does not require complex mechanism adjustments, and allows the molding operation to be carried out safely and easily with a minimum number of personnel. [Means for solving the problem]

[0009] To achieve the above objective, the invention according to claim 1 of this application comprises a plurality of intermediate frames installed on a frame so as to be movable in the longitudinal direction thereof, all of the Center frame Set A pair of side plates that are movable in the width direction of the frame, Two adjacent objects on the platform A partition plate provided between the aforementioned middle frame and installed at both ends in the longitudinal direction of the frame Before Inscription box of A component provided at the end that can move in the longitudinal direction of the frame two A formwork for a concrete product having end plates, all The aforementioned middle frame has a plurality of cylindrical members extending in its width direction, and at least one of the middle frame is Rotatable around the vertical axis It has a gearbox equipped with a pinion, all a pair Both side plates This consists of a plurality of horizontal rail sections that are inserted into the cylindrical member and are slidable inside it. to haveFurthermore, it can be fixed in contact with the aforementioned middle frame. The pair of side plates provided on the middle frame having the gearbox have rack portions that mesh with the pinion in the gearbox such that one side plate and the other side plate maintain an equal distance from the middle frame, and these rack portions mesh with the pinion at opposite positions on either side of the vertical axis portion. The partition plate is supported by two adjacent intermediate frames in the longitudinal direction of the frame, and can be positioned in contact with or separated from the ends of those intermediate frames. The two end plates teeth, all It is characterized by having an end plate clamp connected to the end of a connecting member that penetrates the inside of the middle frame, and being able to be fixed in contact with the middle frame.

[0010] Furthermore, the invention according to claim 2 of this application is characterized in that one of the intermediate frames is fixed on the support frame.

[0011] Furthermore, the invention according to claim 3 of the present application is characterized in that the partition plate has means for limiting the distance between it and two adjacent intermediate frames in the longitudinal direction of the frame.

[0012] Furthermore, the invention relating to claim 4 of this application is, all The pair of side plates are characterized by having at least one locking mechanism having a locking member and a locked member that can lock together.

[0013] Furthermore, the invention relating to claim 5 of this application is, all The pair of side plates are characterized in that the multiple locking mechanisms they provide share a common operating section.

[0014] Furthermore, the invention according to claim 6 of the present application is characterized in that at least two or more adjacent side plates are connected by means that can change the distance between them.

[0015] Furthermore, the invention according to claim 7 is at least one The pair of side plates are characterized by having fixing means for maintaining a state separate from the central frame.

[0016] Furthermore, the invention according to claim 8 is characterized in that only one of the end plates has the end plate clamp connected to one end of the connecting member, and the other end plate is connected to the other end of the connecting member. [Effect of the Invention]

[0017] As described above, according to the inventions according to claims 1 and 2, A pair of side plates, provided on a central frame containing a gearbox, have rack sections that mesh with a pinion in the gearbox such that one side plate and the other side plate maintain an equal distance from the central frame. These two rack sections mesh with the pinion at opposite positions, straddling a vertical axis. As a result, the pair of side plates can move parallel to each other in the width direction of the frame while maintaining an equal distance from the central frame. Furthermore, by pushing one of the side plates toward the central frame or pulling it away from the central frame, the other side plate can be moved similarly and simultaneously. Therefore, since it is not necessary to move the two side plates separately when moving the pair of side plates, the number of work steps for mold assembly and mold unfolding can be reduced, and the workload of the workers performing the work can be further reduced.

[0018] Further, according to the invention according to claim 3, since the partition plate has a structure having means for restricting the distance between two adjacent middle frames in the longitudinal direction of the gantry, when moving one of the adjacent middle frames away from the other, by moving it to a position where the movement is restricted by the movement restricting means of the partition plate, a natural and constant distance can be ensured between the partition plate and the two adjacent middle frames in the longitudinal direction of the gantry. Therefore, it is possible to easily secure the space required when demolding precast concrete products, and the labor of the operator can be reduced.

[0019] Further, according to the invention according to claim 4, all since the pair of side plates has a structure including at least one locking mechanism having a locking member and a locked member that can be locked to each other, and further, according to the invention according to claim 5, all since the plurality of locking mechanisms provided in the pair of side plates share an operation part and have a structure in which the plurality of locking mechanisms can be operated simultaneously, all the work of fixing or releasing the fixing of the pair of side plates in contact with the middle frame can be easily performed only by operating the operation part of the locking mechanism, and the number of work steps can be reduced. Therefore, the labor of the operator performing mold assembly and mold opening can be further reduced.

[0020] Further, according to the invention according to claim 6, since at least two or more adjacent side plates are connected by means capable of changing the distance between them, even when performing mold assembly and mold opening, the connection state between adjacent side plates can always be maintained. Therefore, since a plurality of adjacent side plates can be operated simultaneously, the number of work steps for mold assembly and mold opening can be reduced, and the labor of the operator performing the work can be further reduced.

[0021] Furthermore, according to the invention of claim 7, at least one Because the structure has fixing means to maintain the pair of side plates in a state separate from the central frame, accidents such as the side plates unexpectedly moving and colliding with and falling onto the precast concrete product during demolding can be prevented, thereby ensuring the safety of the workers.

[0022] Furthermore, according to the invention of claim 8, since the end plate clamp is provided on only one of the two end plates, the structure of the molding frame can be further simplified, the number of work steps for mold assembly and mold opening can be further reduced, and the labor of the workers performing the work can be further reduced. [Brief explanation of the drawing]

[0023] [Figure 1] This is a perspective view of the mold opening state of the molding frame according to the present invention. [Figure 2] This is a perspective view of the mold assembly state of the molding frame according to the present invention. [Figure 3] This is an enlarged partial cross-sectional perspective view of Figure 1. [Figure 4] This is an enlarged partial cross-sectional perspective view of Figure 2. [Figure 5] This is an enlarged cross-sectional view of the unlocked state of the locking mechanism as seen from the direction of the arrow II-II in Figure 2. [Figure 6] This is an enlarged cross-sectional view of the locked state of the locking mechanism as seen from the direction of the arrow II-II in Figure 2. [Figure 7] This is a cross-sectional view taken from the direction of the arrow II in Figure 1. [Figure 8] This is a cross-sectional view taken from the direction of the arrow III-III in Figure 2. [Modes for carrying out the invention]

[0024] Embodiments of the present invention will be described below with reference to the figures. While embodiments will be described in detail below, the present invention is not limited thereto. The present invention relates to a molded formwork 1 used when forming a gate-shaped side ditch block, which is a precast concrete product, by vibration compaction. In the following description, the longitudinal direction of the molded formwork 1 will be referred to as the front-to-back direction (the right side of the page is the front), the width direction as the left-to-right direction, and the height direction as the up-and-down direction.

[0025] As shown in Figure 1, the molding frame 1 includes a frame 10, a middle frame 20, an end plate 30, a partition plate 40, and a side plate 50. The frame 10 is a long member with a roughly H-shaped cross-section that extends in the front-to-back direction and has two foundation sections 11, 11 laid parallel to each other. A rail section 12 that protrudes upward and extends in the front-to-back direction is formed on the upper surface of the foundation section 11 near its outer end in the width direction (left-to-right direction). The frame 10 also has a horizontal foundation section 13 which is a member with a roughly H-shaped or U-shaped cross-section that extends in the left-to-right direction. As shown in Figures 5 and 7, the two foundation sections 11, 11 are connected at multiple points by the horizontal foundation section 13, and the two foundation sections 11, 11 are kept parallel.

[0026] An intermediate frame 20 is installed on the rail sections 12 of the two foundation sections 11, 11, spanning between these rail sections 12, 12. Three of these intermediate frames 20 are provided in the front-to-back direction of the two foundation sections 11, 11, and each has approximately equal length.

[0027] The middle frame 20 is a roughly rectangular member with a roughly convex cross-section, an opening at the bottom, and extending in the front-to-back direction, and has a plurality of inner frame portions 21 on its inside. The middle frame 20 also consists of an upper frame portion 20a that forms the inner surface and upper end surface of the gate-shaped side ditch block located above it, and left and right base portions 20b, 20b that are located below the upper frame portion 20a and support the upper frame portion 20a.

[0028] As shown in Figures 5 and 7, the left and right base portions 20b, 20b each have four horizontally elongated, roughly rectangular clamp holes 22, spaced apart and positioned at corresponding locations, through which the side plate clamps 63 provided on the side plate 50 (described later) are inserted. In addition, two rectangular tubular members 24 are provided at positions near both ends in the front-to-back direction of the base portion 20b for inserting the side plate rail portions 55 provided on the side plate 50 (described later). These rectangular tubular members 24 are cylindrical members with a vertically elongated, roughly rectangular cross-section, and are provided to penetrate the left and right base portions 20b, 20b.

[0029] Of the three intermediate frames 20 provided on the rail sections 12 of the two base sections 11, 11, the front and rearmost intermediate frames 20, 20 have wheel sections 25 rotatably provided on the inside of the left and right base sections 20b, 20b, at positions closer to the front and rear of the base sections 20b, respectively. These four wheel sections 25 are in a state where they are resting on the rail sections 12 of the base section 11. On the other hand, the middle intermediate frame 20 of the three intermediate frames 20 does not have a wheel section 25 provided.

[0030] As shown in Figures 5 and 6, the inner frame portion 21 is a plate-shaped, substantially convex member, and its outer edge is fixed in contact with the inner surface of the middle frame 20, maintaining its shape so that the middle frame 20 is not distorted by external forces. Furthermore, as shown in Figures 7 and 8, the inner frame portion 21 is fixed to the inner surface of the middle frame 20 so as to be substantially perpendicular to the upper frame portion 20a and the base portion 20b of the middle frame 20, and is provided near both ends in the front-rear direction of the middle frame 20, as well as multiple inner frame portions 21, 21 provided at substantially equal intervals so as to be parallel to each other.

[0031] Furthermore, the lower end portion 21b of the inner frame portion 21 is provided to extend downward from the lower end portion 20b of the middle frame 20, and stepped portions 21a are formed at both ends in the left-right direction. As a result, the middle middle frame 20 of the three middle frames 20 has its stepped portion 21a of the inner frame portion 21 in contact with the rail portion 12 of the base portion 11, and is supported by the inner frame portion 21, so it is in a state where it cannot move on the rail portion 12 (it is fixed).

[0032] On the other hand, the leading and rearmost of the three middle frames 20 are supported by the four wheel sections 25 as described above, and are therefore able to travel in the forward and backward direction on the rail section 12 of the base section 11. Note that the stepped section 21a of the middle frame section 21 and the rail section 12, and the lower end 21b of the middle frame section 21 and the base section 11 are not in contact, and a narrow gap is provided between them.

[0033] In the inner frame portions 21, 21 provided near the front end of the front inner frame 20 and near the rear end of the rearmost inner frame 20, a vertically elongated, roughly rectangular opening 21d extending in the vertical direction is formed approximately in the center in the left-right direction for inserting the end plate clamp 33, which will be described later. In addition, in the inner frame portions 21 provided near the rear end of the front inner frame 20, near the front end of the rearmost inner frame 20, and near both ends in the front-rear direction of the middle inner frame 20, a horizontally elongated, roughly rectangular opening 21c extending in the left-right direction is formed slightly above the approximate center in the vertical direction for inserting the connecting member 35 connected to the end frame clamp 33, which will be described later, and the horizontal bar 41 provided on the partition plate 40. Furthermore, in all inner frame portions 21 provided except near the front-to-back ends of the three middle frames 20, vertically elongated, roughly rectangular connecting holes 21e are formed at corresponding positions, near the upper part of the approximate center in the left-to-right direction, for inserting the connecting member 35, which will be described later.

[0034] In the left and right base portions 20b, 20b of the middle of the three middle frames 20, horizontally elongated, roughly rectangular rack holes 26 are formed at corresponding positions approximately in the center in the front-to-back direction, through which a rod-shaped rack portion 56 provided on the side plate 50 (described later) is inserted. In addition, vertically elongated, roughly rectangular slide rail holes 27 are formed in the left and right base portions 20b, 20b at corresponding positions below the ends in the front-to-back direction of the rack holes 26, near the front-to-back ends, for inserting a slide rail 59 provided on the side plate 50 (described later).

[0035] Furthermore, in the central frame 20, as shown in Figures 3 and 4, a gearbox 29 is provided between the positions where the rack holes 26, 26 of the left and right base portions 20b, 20b are formed. This gearbox 29 has a bottom plate portion 29a that is placed between the respective rack holes 26 formed in the left and right base portions 20b, 20b and is positioned to be approximately horizontal, a vertical shaft portion 29c that is fixed to the bottom plate portion 29a to be approximately perpendicular, and a pinion 29d that is rotatable horizontally around the vertical shaft portion 29c.

[0036] Between adjacent middle frames 20, 20, as shown in Figures 1 and 3, etc., roughly rectangular, plate-shaped partition plates 40 are provided so as to be perpendicular to the ground. These front and rear partition plates 40, 40 are formed to be slightly larger than the upper frame portion 20a of the middle frame 20, and are provided so that, as will be described later, when the left plate 50a and the right plate 50b are in contact with the middle frame 20, they can be made to contact and close the front and rear ends of the middle frame 20 and the front and rear ends of the left plate 50a and the right plate 50b without any gaps.

[0037] As shown in Figures 7 and 8, two horizontal bars 41, which are roughly rectangular in shape and plate-like, are provided side by side in the left-right direction near the center of the partition plate 40, extending horizontally and being approximately perpendicular to the partition plate 40. These horizontal bars 41 are fixed so as to protrude evenly from the front and rear of the partition plate 40. In addition, the horizontal bars 41 have protruding portions 41a at both ends in the front-rear direction that protrude downward.

[0038] The ends of the horizontal bars 41 are inserted through openings 21c in the inner frame sections 21, which are located immediately in front of and behind the partition plate 40, and also near both ends of the inner frame 20 in the front-rear direction. Specifically, two horizontal bars 41 are placed between the openings 21c of the inner frame sections 21, 21 located immediately in front of and behind the partition plate 40, thereby supporting the partition plate 40 by the inner frame sections 21, 21 located in front of and behind it. Furthermore, the protruding portions 41a at both ends of the horizontal bars 41 in the front-rear direction are structured to be able to lock into the edges of the openings 21c of the inner frame sections 21, 21.

[0039] With the above structure, when the front and rearmost middle frames 20, 20 of the three middle frames 20 are pulled and moved away from both ends of the middle middle frame 20 in the front-rear direction (forward and backward), the protrusions 41a at both ends of the horizontal bar 41 can move until they engage with the inner frame parts 21, 21 (edges of the opening 21c) located immediately in front of and behind the partition plate 40, respectively. After engagement, the movement of the front and rearmost middle frames 20, 20 is restricted so that the gap between the partition plate 40 and the inner frame parts 21 (middle frames 20) does not widen any further. At this time, the partition plate 40 is maintained in a state perpendicular to the ground.

[0040] The end plate 30 is a roughly rectangular member, and as shown in Figures 1 and 7, a front end plate 30a and a rear end plate 30b are provided at the front and rear ends of the molding frame 1, respectively. Specifically, at the front and rear ends of the base portion 20b of the first and last of the three middle frames 20, plate-shaped end plate support portions 20c are provided that extend horizontally forward and backward, supporting the front end plate 30a and the rear end plate 30b. Therefore, the front end plate 30a and the rear end plate 30b are movable in the front-rear direction on the end plate support portions 20c.

[0041] These front end plates 30a and rear end plates 30b have a roughly rectangular, plate-shaped end plate forming surface 31 that is provided perpendicular to the ground, and are installed so that, as will be described later, when the left end plate 50a and the right end plate 50b are in contact with the middle frame 20, they can seal the front and rear ends of the middle frame 20 and the front and rear ends of the left end plate 50a and the right end plate 50b without any gaps.

[0042] A vertically elongated, roughly rectangular insertion opening 31a is formed approximately in the center of the end plate forming surface 31 in the left-right direction, extending in the vertical direction. Furthermore, on the outer sides of the end plate forming surface 31 of the front end plate 30a and the rear end plate 30b, plate-shaped ribs 32 extending in the vertical direction are provided on both sides of the insertion opening 31a. A shaft portion 34 is provided between the two ribs 32, 32 at a position slightly above the center in the vertical direction of the two ribs 32, 32.

[0043] The front end plate 30a and the rear end plate 30b are provided with end plate clamps 33. As shown in Figures 7 and 8, one end of the end plate clamp 33 is connected to the rib 32 via a shaft portion 34, and is rotatable around the shaft portion 34. The end plate clamp 33 is inserted through the insertion opening 31a of the end plate forming surface 31 and the opening 21d of the inner frame portion 21 of the middle frame 20, with the other end located inside the front and rear middle frames 20, 20.

[0044] Furthermore, the ends of connecting members 35 are pivotably connected to the other ends of the two end plate clamps 33. These connecting members 35 are long, strip-shaped members that are inserted through the openings 21c and connecting holes 21e of the inner frame portions 21 provided inside the three inner frames 20, and are provided to penetrate the inside of the three inner frames 20, and are movable in the front-rear direction of the molding mold 1.

[0045] Therefore, as shown in Figure 8, tightening the end plate clamp 33 creates a force that pulls the front end plate 30a and the rear end plate 30b toward the end of the connecting member 35. On the other hand, as shown in Figure 7, loosening the end plate clamp 33 eliminates the force that pulls the front end plate 30a and the rear end plate 30b toward the end of the connecting member 35, making it possible to move the front end plate 30a and the rear end plate 30b away from the end of the connecting member 35 (the end of the middle frame 20).

[0046] Shaft holes 36 are formed at both ends in the left-right direction of the end plate forming surface 31, slightly above the center in the vertical direction. In addition, shaft fixing holes (not shown) are formed in the inner frame portions 21, 21 provided near the front end of the front inner frame 20 and near the rear end of the rearmost inner frame 20, and in the inner frame portion 21 provided next to them, at positions corresponding to the shaft holes 36. A rod-shaped slide shaft 38 is inserted through each shaft fixing hole and fixed to each inner frame portion 21, with one end of the shaft protruding outward from the inner frame portions 21, 21 provided near the front end of the front inner frame 20 and near the rear end of the rearmost inner frame 20.

[0047] Furthermore, one end of the protruding slide shaft 38 is inserted through the shaft hole 36 of the end plate forming surface 31, and a stopper portion 39 having an outer diameter larger than the diameter of the shaft hole 36 is provided at its tip. As a result, the front end plate 30 and the rear end plate 30b are in a state where they can move parallel in the front-rear direction along the slide shaft 38 on the end plate support portion 20c.

[0048] With the above structure, as shown in Figures 2 and 8, when the two end plate clamps 33, 33 of the front end plate 30a and rear end plate 30b of the molding frame 1 are tightened, the front end plate 30a and rear end plate 30b are pulled towards the end side of the connecting member 35. As a result, the front end plate 30a moves parallel to the end plate support part 20c while maintaining a perpendicular position to the ground, toward the front end of the front inner frame 20, and the rear end plate 30b moves parallel to the end of the rearmost inner frame 20, toward the rearmost inner frame 20. The front end plate 30a then comes into contact with the front inner frame 20 and subsequently pushes that inner frame 20 backward, and the rear end plate 30b comes into contact with the rearmost inner frame 20 and subsequently pushes that inner frame 20 forward.

[0049] Furthermore, since the front and rear middle frames 20, 20 can run on the rail section 12 of the base section 11, they are pushed backward and forward by the front end plate 30a and rear end plate 30b as described above, so they move toward and come into contact with the front and rear partition plates 40, 40.

[0050] Furthermore, as they are pushed into the front and rear end plates 30a and 30b, the front and rear middle frames 20, 20 move toward both ends in the front-rear direction of the middle middle frame 20, together with the front and rear partition plates 40, 40 which are in contact with each other, so that the front and rear partition plates 40, 40 are in contact with both ends in the front-rear direction of the middle middle frame 20, respectively. Finally, the front and rear end plates 30a and 30b, the three middle frames 20, and the front and rear partition plates 40 are fixed together in a state where they are in contact with each other and form a single unit. At this time, the connecting member 35 is strongly stretched in the front-rear direction by the other ends of the end plate clamps 33, 33 of the front and rear end plates 30a and 30b.

[0051] On the other hand, as shown in Figures 1 and 7, when the two end plate clamps 33, 33 of the front end plate 30a and rear end plate 30b of the molding frame 1 are loosened, the connecting member 35 becomes loose, and the front end plate 30a and rear end plate 30b become movable away from the ends of the middle frame 20. Therefore, by moving the front end plate 30a in a direction away from the front end of the front middle frame 20, and the rear end plate 30b in a direction away from the rear end of the rear middle frame 20, while maintaining a perpendicular position to the ground, it becomes possible to create a gap between the front end plate 30a and rear end plate 30b and the ends of the front and rear middle frames 20, 20. At this time, the front end plate 30a and rear end plate 30b can be moved in parallel until the end plate forming surface 31 abuts against the stopper portion 39 of the slide shaft 38.

[0052] Furthermore, when the connecting member 35 is loosened, the leading and rearmost middle frames 20, 20 can be pulled and moved on the rail portion 12 of the base portion 11, each away from both ends of the middle middle frame 20 in the front-rear direction. Specifically, by pulling the front end plate 30a away from the front end of the leading middle frame 20 and the rear end plate 30b away from the rear end of the rearmost middle frame 20, and continuing to pull them even after the end plate forming surface 31 abuts against the stopper portion 39 of the slide shaft 38, the leading and rearmost middle frames 20, 20 can be moved away from both ends of the middle middle frame 20 in the front-rear direction.

[0053] When the front and rearmost middle frames 20, 20 are continuously moved in the direction described above, the edges of the openings 21c of the inner frame portions 21, 21 located near the rear end of the front middle frame 20 and near the front end of the rearmost middle frame 20 abut against and lock against the protruding portion 41a at the front end of the horizontal bar 41 provided on the front partition plate 40 and the protruding portion 41a at the rear end of the horizontal bar 41 provided on the rear partition plate 40. At this time, a gap is created between the front and rearmost middle frames 20, 20 and the front and rear partition plates 40, 40.

[0054] Furthermore, by continuing to move the front and rear middle frames 20, 20 in the direction described above, the horizontal bars 41 of the front and rear partition plates 40, 40 are pulled by the inner frame portion 21 (edge ​​of the opening 21c) that engages with their protruding portions 41a, so that the front and rear partition plates 40, 40 move away from both ends of the middle middle frame 20 in the front-rear direction while maintaining a state perpendicular to the ground.

[0055] Furthermore, by continuing to move the front and rearmost middle frames 20, 20 in the above direction, the protruding portion 41a at the rear end of the horizontal bar 41 provided on the front partition plate 40 and the protruding portion 41a at the front end of the horizontal bar 41 provided on the rear partition plate 40 will abut against the edges of the openings 21c of the inner frame portions 21, 21 provided near both ends of the middle middle frame 20 in the front-rear direction, and become locked in place. After being locked in place, the movement of the front and rearmost middle frames 20, 20 is restricted. At this time, a gap is created between the front and rear partition plates 40, 40 and the middle middle frame 20.

[0056] In this embodiment, the front end plate 30a and the rear end plate 30b are each provided with end plate clamps 33, 33. However, the end plate clamp 33 may be provided on only one of the front end plate 30a or the rear end plate 30b. In that case, one end of the connecting member 35 is pivotably connected to the other end of the end plate clamp 33, and the other end of the connecting member 35 is directly connected to the front end plate 30a or the rear end plate 30b that does not have an end plate clamp 33.

[0057] The side plates 50 are horizontally elongated, roughly rectangular members, and as shown in Figures 1 and 7, etc., they are provided on both the left and right sides of the three middle frames 20. Specifically, the side plates 50 consist of a left side plate 50a and a right side plate 50b, which have a length approximately equal to the front-to-back length of the middle frame 20. The left side plate 50a and the right side plate 50b face the upper frame portion 20a of the middle frame 20 and have horizontally elongated, roughly rectangular, plate-like side plate forming surfaces 51 that are provided approximately perpendicular to the ground.

[0058] The upper and lower ends of the side plate forming surface 51 are provided with an upper end frame portion 52 and a lower end frame portion 53 that extend horizontally outward. In addition, on the outer side of the side plate forming surface 51 of the left plate 50a and the right plate 50b, multiple plate-shaped ribs 54 are provided at approximately equal intervals, extending from the upper end frame portion 52 to the lower end frame portion 53, respectively. These ribs 54 extend approximately perpendicular to the ground and are arranged so that they are parallel to each other.

[0059] At the lower end frame portion 53 of each of the three left-side plates 50a, as shown in Figures 3 and 4, a rod-shaped side plate horizontal rail portion 55 with a roughly vertically elongated rectangular cross-section is fixed at positions corresponding to the two inner rectangular tubular members 24, 24 of the four rectangular tubular members 24 formed on the base portion 20b of the middle frame 20, extending horizontally toward the middle frame 20. Similarly, at the lower end frame portion 53 of each of the right-side plates 50b, a rod-shaped side plate horizontal rail portion 55 with a roughly vertically elongated rectangular cross-section is fixed at positions corresponding to the two outer rectangular tubular members 24, 24 of the four rectangular tubular members 24 formed on the base portion 20b of the middle frame 20, extending horizontally toward the middle frame 20.

[0060] The side plate horizontal rail section 55 is inserted into a rectangular tubular member 24 provided on the base section 20b of the central frame 20. The inner width of the rectangular tubular member 24 is approximately equal to or slightly larger than the outer width of the side plate horizontal rail section 55, and the inner height of the rectangular tubular member 24 is approximately equal to or slightly higher than the outer height of the side plate horizontal rail section 55. As a result, the side plate horizontal rail section 55 can move smoothly horizontally (left and right) within the rectangular tubular member 24 without requiring much force (it can be inserted and removed), thereby allowing the left plate 50a and the right plate 50b to move parallel to each other in the left and right directions.

[0061] Furthermore, the mechanism provided between the middle frame 20 and the left and right plates 50a and 50b to allow the left and right plates 50a and 50b to move parallel to each other does not necessarily have to be a mechanism consisting of a combination of a rod-shaped member and a cylindrical member as in this embodiment. It may be a mechanism consisting of a combination of members that can slide while maintaining contact with each other. For this reason, it may be a mechanism consisting of a combination of a rod-shaped member and a member that can slide while sandwiching that member from the left and right or from above and below.

[0062] As shown in Figures 3 and 4, at the lower end frame portions 53, 53 of the left plate 50a and right plate 50b of the central frame 20, a rod-shaped rack portion 56 with a roughly rectangular cross-section is fixed to the left and right base portions 20b, 20b of the central frame 20, at positions corresponding to the rack holes 26 formed in the base portions 20b, 20b of the central frame 20, extending horizontally toward the central frame 20. Each of these rack portions 56 has teeth cutting on one side. The rack portion 56 of the left plate 50a and the rack portion 56 of the right plate 50b are inserted into the gearbox 29 through the rack holes 26, respectively, and mesh with the pinion 29d installed in the gearbox 29, with the vertical shaft portion 29c in between, at opposite positions, forming a side plate link slide mechanism.

[0063] Furthermore, the rack portion 56 of the left plate 50a and the rack portion 56 of the right plate 50b are engaged with the pinion 29d at a position where the distance between the middle frame 20 and the left plate 50a is equal to the distance between the middle frame 20 and the right plate 50b.

[0064] With the above structure, by moving either the left side plate 50a or the right side plate 50b to the left or right, the rack portion 56 provided on that side plate 50 also moves to the left or right, causing the pinion 29d that meshes with the rack portion 56 to rotate. As a result of the rotation of the pinion 29d, the other rack portion 56 that meshes with the pinion 29d moves to the right or left, making it possible to move the other side plate 50 on which the rack portion 56 is provided to the right or left.

[0065] The slide rail 59 is pivotably connected via the shaft 60 at a position directly below where the rack portion 56 is fixed to the lower end frame portion 53 of the left side plate 50a, and at a position corresponding to the slide rail hole 27 formed in the base portion 20b of the central frame 20.

[0066] The slide rail 59 has a rod-shaped rail section 61 with a vertically elongated, roughly rectangular cross-section that extends roughly horizontally from the shaft section 60 toward the inner frame 20, and this rail section 61 is inserted into the slide rail hole 27 of the base section 20b of the inner frame 20. The slide rail 59 also has a release pedal 62 that extends roughly horizontally from the shaft section 60 toward the opposite side of the inner frame 20. Therefore, by pressing the release pedal 62, the tip of the rail section 61 is lifted with the shaft section 60 as the pivot point.

[0067] Furthermore, the inner width of the slide rail hole 27 is approximately equal to or slightly larger than the outer width of the rail portion 61 of the slide rail 59, and the inner height of the slide rail hole 27 is higher than the outer height of the rail portion 61. Therefore, the rail portion 61 is able to move vertically within the slide rail hole 27.

[0068] A recessed area 61a, which is a notch that can engage with the slide rail hole 27 formed in the base portion 20b of the middle frame 20, is formed on the lower surface near the tip of the rail portion 61 of the slide rail 59. Therefore, when the rail portion 61 moves and the recessed area 61a reaches the position of the slide rail hole 27, the weight of the rail portion 61 causes the recessed area 61a and the slide rail hole 27 to engage.

[0069] On the other hand, by pressing the release pedal 62, the tip of the rail section 61 is lifted with the shaft section 60 as the pivot point, thereby releasing the locking between the recess 61a of the rail section 61 and the slide rail hole 27.

[0070] With the above structure, as shown in Figures 3 and 4, the left plate 50a and the right plate 50b can be simultaneously moved in parallel to a position where they contact the middle frame 20, or to a position away from it, while maintaining a state where they are approximately perpendicular to the ground. Specifically, when the recess 61a of the rail portion 61 of the slide rail 59 and the slide rail hole 27 are not engaged, pushing the left plate 50a toward the middle frame 20 (to the right) allows the right plate 50b to also move toward the middle frame 20 (to the left) due to the action of the side plate link slide mechanism.

[0071] On the other hand, by pulling out and moving the left side plate 50a away from the middle frame 20 (to the left), the side plate link slide mechanism causes the right side plate 50b to also move away from the middle frame 20 (to the right). When the left side plate 50a has moved a certain distance from the middle frame 20 and the recess 61a of the rail section 61 has reached the position of the slide rail hole 27, the weight of the rail section 61 causes the recess 61a and the slide rail hole 27 to lock together, fixing the position of the left side plate 50a so that it cannot move. Consequently, the side plate link slide mechanism also causes the position of the right side plate 50b to be fixed so that it cannot move.

[0072] Furthermore, if you want to move the left plate 50a and the right plate 50b toward the middle frame 20 from the state in which they are fixed and immovable as described above, you should press down on the release pedal 62 to release the lock between the recess 61a of the rail section 61 and the slide rail hole 27, and then push the left plate 50a toward the middle frame 20 (to the right). By doing this, the position of the recess 61a of the rail section 61 and the position of the slide rail hole 27 will be misaligned, making it possible to move the left plate 50a and the right plate 50b. Note that after misaligning the position of the recess 61a of the rail section 61 and the position of the slide rail hole 27 as described above, you can move the left plate 50a and the right plate 50b without continuing to press down on the release pedal 62.

[0073] Furthermore, when the left plate 50a and the right plate 50b are in contact with the middle frame 20, a recess 61a that can engage with the slide rail hole 27 formed in the base portion 20b of the middle frame 20 may be formed on the lower surface of the rail portion 61 of the slide rail 59. By providing such a recess 61a, it is possible to fix the left plate 50a and the right plate 50b in contact with the middle frame 20 and prevent them from moving.

[0074] On the lower end frame portion 53 of each left side plate 50a provided on the three middle frames 20, as shown in Figures 3 and 4, side plate clamps 63, which are locking members, are fixed at positions corresponding to the four clamp holes 22 formed in the base portion 20b of the middle frame 20, extending horizontally toward the middle frame 20. Also, on the lower end frame portion 53 of each right side plate 50b provided on the three middle frames 20, attachments 68, which are locked members, are fixed at positions corresponding to the clamp holes 22 in the base portion 20b of the middle frame 20. These side plate clamps 63 and attachments 68 form a locking mechanism.

[0075] The side plate clamp 63 has a frame portion 64, which is a vertically elongated, roughly rectangular frame member that can be simultaneously inserted into the clamp holes 22, 22 formed in the left and right base portions 20b, 20b of the middle frame 20, as shown in Figure 4, when the left side plate 50a is in contact with the middle frame 20. As shown in Figures 5 and 6, a first notch 64a is formed at the tip of the frame portion 64, and a second notch 64b is formed at a higher position than the first notch 64a and on the rear end side, via an inclined portion that slopes upward from the first notch 64a toward the rear end of the frame portion 64. On the other hand, the rear end of the frame portion 64 is fixed to the lower end frame portion 53 of the left side plate 50a.

[0076] Furthermore, as shown in Figures 1 and 3, each side plate clamp 63 is provided with an operating section 66 consisting of a lever section 66a and a shaft section 66b. The shaft section 66b of the operating section 66 passes through the rear ends of the frame sections 64 of the two front side plate clamps 63, 63 and the two rear side plate clamps 63, 63, which are provided on the left side plate 50a, and is rotatably supported. In addition, a lever section 66a is provided at one end of the shaft section 66b. Therefore, the two front side plate clamps 63, 63 and the two rear side plate clamps 63, 63 are structured to share the same operating section 66.

[0077] Furthermore, each of the four side plate clamps 63 provided on the left side plate 50a is provided with a hook portion 65. This hook portion 65 has a rod-shaped guide shaft portion 65a, and at its tip, a tip locking portion 65b is provided substantially perpendicular to the guide shaft portion 65a, which can be placed on the first notch 64a and the second notch 64b of the frame portion 64. In addition, a connecting portion 65c is provided at the rear end of the guide shaft portion 65a, and via the connecting portion 65c, it is connected to a shaft portion 66b that penetrates the rear end of the frame portion 64.

[0078] Therefore, by raising or pulling down the lever portion 66a of the operating portion 66, it is possible to simultaneously operate the two hook portions 65, 65 connected to the shaft portion 66b, as shown in Figures 5 and 6, and the connecting portion 65c allows the tip locking portion 65b of the hook portion 65 to be moved in the left-right direction.

[0079] The attachment 68 has a notch 68a formed in its lower part, and when the left plate 50a and the right plate 50b are in contact with the middle frame 20, the notch 68a of the attachment 68 and the tip locking portion 65b of the hook portion 65 can be locked together by operating the lever portion 66a of the operating portion 66.

[0080] With the above structure, when the left plate 50a and the right plate 50b are in contact with the middle frame 20, raising the lever portion 66a of the operating portion 66 causes the tip locking portions 65b of the two hook portions 65, 65 connected to the shaft portion 66b to move toward the tip side (to the right) of the frame portion 64, and are placed on the first notch portion 64a of the frame portion 64, as shown in Figure 5. As a result, the locking mechanism is released.

[0081] On the other hand, by pulling down the lever portion 66a of the operating portion 66 toward the front, as shown in Figure 6, the locking tip portions 65b of the two hook portions 65, 65 connected to the shaft portion 66b move toward the rear end side (left direction) of the frame portion 64, thereby releasing the state in which it is resting on the first notch portion 64a of the frame portion 64.

[0082] Furthermore, by pulling the handle portion 66a towards the front and making it nearly horizontal, the locking portions 65b at the ends of the two hook portions 65, 65 pass through an inclined portion that slopes upward toward the rear end of the frame portion 64, and are placed on the second notch portion 64b of the frame portion 64, and are locked into the notch portion 68a of the attachment 68 fixed to the lower end frame portion 53 of the right side plate 50b. This locks the mechanism in a locked state. In this way, by operating the operating portion 66, it is possible to simultaneously operate multiple side plate clamps 63 (locking mechanisms) that share the operating portion 66.

[0083] In the locked state described above, a force acts on the tip locking portion 65b of the hook portion 65 to pull it toward the rear end (leftward) of the frame portion 64, and at the same time, a force acts on the rear end of the frame portion 64 to pull it toward the tip locking portion 65b of the hook portion 65. As a result, the right plate 50b, to which the attachment 68 that locks with the tip locking portion 65b of the hook portion 65 is fixed, is strongly pulled toward the middle frame 20, and the left plate 50a, to which the frame portion 64 is fixed, is also strongly pulled toward the middle frame 20. Therefore, the left plate 50a and the right plate 50b can be fixed with the middle frame 20 in between.

[0084] In this embodiment, the pair of left-side plates 50a and right-side plates 50b are provided with four locking mechanisms, each consisting of a side plate clamp 63 (a locking member) and an attachment 68 (a locked member). However, any number of locking mechanisms may be provided as long as at least one is available.

[0085] Furthermore, in this embodiment, of the four side plate clamps 63 provided on the pair of left plate 50a and right plate 50b, two side plate clamps 63 share a common operating section 66, allowing two locking mechanisms to be operated simultaneously. However, the operating sections 66 of the side plate clamps 63 do not necessarily have to be shared, and three or more side plate clamps 63 may share a common operating section 66, allowing three or more locking mechanisms to be operated simultaneously.

[0086] The left-side plates 50a and right-side plates 50b, each provided on the left and right sides of the three central frames 20, are connected by side plate connecting pipes 69. Specifically, as shown in Figures 1 and 4, pipe holes 70 having an inner diameter approximately equal to the outer diameter of the side plate connecting pipes 69 are formed at corresponding positions on the multiple ribs 54 provided on the left-side plates 50a and right-side plates 50b. The left-side plates 50a and right-side plates 50b are connected by inserting the side plate connecting pipes 69 through the pipe holes 70 in the multiple ribs 54.

[0087] Therefore, the three left-side plates 50a and the three right-side plates 50b are connected in a straight line. In addition, the left-side plates 50a and the right-side plates 50b of the front and rearmost middle frames 20, 20 are able to move parallel to each other in the front-rear direction along the side plate connecting pipes 69. On the other hand, the side plate connecting pipes 69 are fixed to the multiple ribs 54 provided on the left-side plate 50a and the right-side plate 50b of the middle middle frame 20 by welding or the like.

[0088] With the above structure, when the front and rearmost middle frames 20, 20 of the three middle frames 20 are moved on the rail section 12 of the base section 11 toward or away from the front and rear ends of the middle middle frame 20 (forward and backward), the left side plates 50a and right side plates 50b provided on the front and rear middle frames 20, 20 can move in parallel along the side plate connecting pipe 69 together with the middle frame 20. As a result, the left side plates 50a and right side plates 50b of the three middle frames 20 are maintained in a straight line connection.

[0089] Furthermore, when the left side plate 50a of the middle frame 20 is pushed in the direction toward the middle frame 20 (to the right) or pulled out in the direction toward away from the middle frame 20 (to the left), the left side plates 50a of the leading and rearmost middle frames 20 also move in parallel as a unit, and due to the action of the side plate link slide mechanism, the right side plates 50b of the three middle frames 20 also move in parallel as a unit in the direction toward the middle frame 20 (to the left) or away from the middle frame 20 (to the right).

[0090] In this embodiment, three combinations of middle frames 20 and side frames 50 are provided on the rail section 12, but there may be two, or four or more. Also, in this embodiment, the middle middle frame 20 of the three middle frames 20 is fixed and cannot move on the rail section 12, but there may be one middle frame 20, such as the leading or trailing middle frame 20, that cannot move on the rail section 12 (fixed), or all of the middle frames 20 may be movable on the rail section 12.

[0091] Furthermore, in this embodiment, the side plate link slide mechanism and slide rail 59 are provided only in the middle combination of the three combinations of middle frame 20 and side frame 50, but they may also be provided in any one combination such as the front or rearmost, or in all combinations.

[0092] Furthermore, in this embodiment, as shown in Figures 1 and 2, the pipe holes 70 of the ribs 54 provided at the front end of the left side plate 50a and right side plate 50b of the front inner frame 20, and the pipe holes 70 of the ribs 54 provided at the rear end of the left side plate 50a and right side plate 50b of the rearmost inner frame 20, are not inserted through the side plate connecting pipes 69. Thus, it is not necessary for the side plate connecting pipes 69 to be inserted through the pipe holes 70 of all the ribs 54 provided on the left plate 50a and the right plate 50b. As long as the left plate 50a and the right plate 50b of the front and rear middle frames 20, 20 move parallel in the front-rear and left-right directions, the three left plate 50a and the right plate 50b can maintain a state in which they are connected in a straight line as a single unit. In this way, the side plate connecting pipes 69 do not need to be inserted through the pipe holes 70 of the multiple ribs 54 located in front of the left plate 50a and the right plate 50b of the front middle frame 20, and through the pipe holes 70 of the multiple ribs 54 located in rear of the left plate 50a and the right plate 50b of the rear middle frame 20.

[0093] Furthermore, in this embodiment, the three left-side panels 50a and the three right-side panels 50b are connected in a straight line by the side panel connecting pipes 69. However, if there are four or more combinations of the central frame 20 and the side frames 50, the left-side panels 50a and the right-side panels 50b may be divided into multiple groups, and the left-side panels 50a and the right-side panels 50b within each group may be connected by the side panel connecting pipes 69. For example, if there are five combinations of the central frame 20 and the side frames 50, the left-side panels 50a and the right-side panels 50b may be divided into three front groups and two rear groups, and the left-side panels 50a and the right-side panels 50b within each group may be connected by the side panel connecting pipes 69.

[0094] In that case, at least one combination of the middle frame 20 and side frame 50 for each group must be provided with a side plate link slide mechanism and a slide rail 59.

[0095] From here, a method for manufacturing precast concrete products using the molded formwork 1 according to the present invention will be described. First, as shown in Figures 1 and 7, with the front end plate 30a and rear end plate 30b, the three middle frames 20 and the left side plate 50a and right side plate 50b provided thereon, and the front and rear partition plates 40, 40 all separated from each other, the left side plate 50a and the right side plate 50b are first moved to a position where they are in contact with the middle frame 20.

[0096] At this time, by pushing the left side plate 50a of the central frame 20 toward the central frame 20, the three left side plates 50a move together as a unit. However, if the recess 61a of the slide rail 59 of the left side plate 50a and the slide rail hole 27 formed in the base portion 20b of the central frame 20 are locked together, the release pedal 62 is pressed to release the lock between the recess 61a of the slide rail 59 and the slide rail hole 27, while pushing the left side plate 50a toward the central frame 20. Then, by moving the left side plate 50a toward the central frame 20, the right side plates 50b of the three central frames 20 also move together as a unit toward the central frame 20 in the same direction as the left side plate 50a, due to the action of the side plate link slide mechanism.

[0097] Furthermore, when moving the left side plate 50a toward the middle frame 20, the lever portion 66a of the operating portion 66 of the side plate clamp 63 is raised, and the locking tip portions 65b of the two hook portions 65, 65 are placed on the first notch portion 64a of the frame portion 64, as shown in Figure 5.

[0098] Then, after moving the left plate 50a and the right plate 50b to a position where they are in contact with the middle frame 20, the lever portion 66a of the operating portion 66 is pulled down towards the front to make it nearly horizontal, so that, as shown in Figure 6, the locking tips 65b of the two hook portions 65, 65 are placed on the second notch portion 64b of the frame portion 64 and are locked with the notch portion 68a of the attachment 68 fixed to the lower end frame portion 53 of the right frame 50b, and the left plate 50a is fixed in contact with the middle frame 20. Consequently, the right plate 50b is also fixed in contact with the middle frame 20. Therefore, the left plate 50a and the right plate 50b are fixed with the middle frame 20 in between.

[0099] Next, as shown in Figure 8, the two end plate clamps 33, 33 of the front end plate 30a and the rear end plate 30b are tightened. As a result, the front end plate 30a and the rear end plate 30b move in parallel on the end plate support portion 20c and come into contact with the front end of the front inner frame 20 and the rear end of the rear inner frame 20, respectively.

[0100] Furthermore, the front and rearmost middle frames 20, 20 are pushed backward and forward by the front end plate 30a and rear end plate 30b, respectively, moving toward and coming into contact with the front and rear partition plates 40, 40. Further being pushed by the front end plate 30a and rear end plate 30b, the front and rearmost middle frames 20, 20, together with the adjacent cut plate 40, come into contact with the front and rear ends of the middle middle frame 20, and the front end plate 30a and rear end plate 30b, the three middle frames 20 and the left side plate 50a and right side plate 50b provided on them, and the front and rear partition plates 40, 40 are fixed in a state where they are in contact with each other and become one unit.

[0101] Concrete is poured into the integrated molded formwork 1 in this manner to form a gate-shaped side ditch block, which is a precast concrete product.

[0102] After the concrete has hardened, first loosen the two end plate clamps 33, 33 on the front end plate 30a and the rear end plate 30b. This causes the front end plate 30a to move parallel to the end plate support portion 20c, away from the front end of the front inner frame 20, and the rear end plate 30b to move parallel to the end plate support portion 20b, away from the rear end of the rearmost inner frame 20, creating a gap between the front end plate 30a and the rear end plate 30b and the ends of the front inner frame 20 and the rearmost inner frame 20, 20. At this time, slide the end plate forming surfaces 31 of the front end plate 30a and the rear end plate 30b until they abut against the stopper portion 39 of the slide shaft 38.

[0103] Next, the front and rearmost middle frames 20, 20 are pulled and moved away from both ends of the middle middle frame 20 in the front-rear direction. When the front and rearmost middle frames 20, 20 are moved in the above direction, the edges of the openings 21c of the inner frame portions 21, 21 located near the rear end of the front middle frame 20 and near the front end of the rearmost middle frame 20 abut against the protruding portions 41a, 41a at the front and rear ends of the horizontal bars 41 provided on the front and rear partition plates 40, 40, and become locked in place. At this time, a gap is created between the front and rearmost middle frames 20, 20 and the front and rear partition plates 40, 40.

[0104] Then, by continuing to move the front and rear middle frames 20, 20 in the direction described above, the horizontal bars 41 are pulled by the edges of the openings 21c of the inner frame 21 that engage with their protrusions 41a, causing the front and rear partition plates 40 to move away from both ends of the middle middle frame 20 in the front-rear direction. The front and rear middle frames 20, 20 move until the protrusions 41a at the rear ends of the horizontal bars 41 on the front partition plate 40 and the protrusions 41a at the front ends of the horizontal bars 41 on the rear partition plate 40 abut against and engage with the edges of the openings 21c of the inner frame 21, 21 located near both ends of the middle middle frame 20 in the front-rear direction. At this time, a gap is created between the front and rear partition plates 40, 40 and the middle middle frame 20.

[0105] Next, by raising the lever portion 66a of the operating portion 66, the tip locking portions 65b of the two hook portions 65, 65 are moved from a state in which they are locked to the notch portion 68a of the attachment 68 fixed to the lower end frame portion 53 of the right side plate 50b, to a state in which the tip locking portions 65b of the hook portions 65 are moved toward the tip end of the frame portion 64, as shown in Figure 5, and placed on the first notch portion 64a of the frame portion 64.

[0106] Next, the left side plate 50a of the central frame 20 is pulled out in a direction away from the central frame 20, causing the three left side plates 50a to move as a single unit. Consequently, the right side plates 50b of the three central frames 20 also move together in a direction away from the central frame 20 due to the action of the side plate link slide mechanism. At this point, the left side plate 50a is moved to a position where the recess 61a of the rail portion 61 of the left side plate 50a engages with the slide rail hole 27 formed in the base portion 20b of the central frame 20, and the left side plate 50a is fixed in place. Consequently, the right side plate 50b is also fixed in place due to the action of the side plate link slide mechanism.

[0107] In this way, the front end plate 30a and rear end plate 30b, the three middle frames 20 and the left side plate 50a and right side plate 50b provided on them, and the front and rear partition plates 40 are separated from each other, and the demolding work is performed in such a state that there is a gap between them, thereby removing the gate-shaped side ditch block, which is a precast concrete product.

[0108] After removing the gutter block, the left plate 50a and the right plate 50b are moved to a position where they are in contact with the middle frame 20, in the same manner as described above. The lever portion 66a of the operating portion 66 of the side plate clamp 63 is operated, and the two end plate clamps 33, 33 of the front end plate 30a and the rear end plate 30b are operated to assemble the molding frame 1. The front end plate 30a and the rear end plate 30b, the three middle frames 20 and the left plate 50a and the right plate 50b provided on them, and the front and rear partition plates 40 are fixed in contact with each other as a single unit, in preparation for molding the next gate-shaped gutter block. [Explanation of Symbols]

[0109] 1. Forming mold 41. Horizontal bar 10. Stand 41a. Protruding part 11 Foundation 50 Side plate 12 Rail section 50a Left side plate 13 Lateral foundation 50b Right side plate 20 Inner frame 51 Side plate forming surface 20a Upper frame section 52 Upper end frame section 20b Base section 53 Lower end frame section 20c End plate support section 54 ribs 21 Inner frame section 55 Side plate horizontal rail section 21a Tier section 56 Rack section 21b Lower end 59 Slide rail 21c Opening port 60 Shaft part 21d Opening 61 Rail section 21e Connecting hole 61a Recess 22 clamp holes, 62 release pedals 24 rectangular tubular member 63 side plate clamp 25 Wheel section 64 Frame section 26 Rack hole 64a First notch 27 Slide rail hole 64b Second notch 29 Gearbox 65 Hook section 29a Bottom plate part 65a Guide shaft part 29c Vertical shaft 65b Tip locking part 29d pinion 65c connecting part 30 End plate 66 Operation section 30a Front end plate 66a Lever part 30b Rear end plate 66b Shaft section 31 End plate forming surface 68 Attachment 31a Through opening 68a Notch 32 ribs 69 side plate connecting pipes 33 End plate clamp 70 Pipe hole 34 Shaft 100 Ground 35 Connecting member 36 shaft holes 38 Slide shaft 39 Stopper part 40 partition plates

Claims

1. A concrete formwork comprising: a plurality of intermediate frames installed on a frame so as to be movable in the longitudinal direction thereof; a pair of side plates provided on all of the intermediate frames and movable in the width direction of the frame; a partition plate provided between two adjacent intermediate frames on the frame; and two end plates provided at the ends of the intermediate frames installed at both ends of the frame in the longitudinal direction thereof and movable in the longitudinal direction of the frame, All of the aforementioned middle frames have a plurality of cylindrical members extending in the width direction, At least one of the intermediate frames has a gearbox equipped with a pinion that is rotatable about a vertical axis, Each pair of side plates has multiple horizontal rail sections that are inserted into the cylindrical member and can slide inside it, and can be fixed in contact with the central frame. The pair of side plates provided on the middle frame having the gearbox have rack portions that mesh with the pinion in the gearbox such that one side plate and the other side plate maintain an equal distance from the middle frame. These rack sections mesh with the pinion at opposite positions, with the vertical axis section in between. The partition plate is supported by two adjacent intermediate frames in the longitudinal direction of the frame, and can be in contact with or separated from the ends of those intermediate frames. The two end plates have end plate clamps connected to the ends of connecting members that penetrate the interior of the entire middle frame, and can be fixed in contact with the middle frame. A mold with the following characteristics.

2. The molding frame according to claim 1, characterized in that one of the aforementioned intermediate frames is fixed on the support frame.

3. The molding frame according to claim 1 or 2, characterized in that the partition plate has means for limiting the distance between two adjacent intermediate frames in the longitudinal direction of the frame.

4. The molding frame according to any one of claims 1 to 3, characterized in that all pairs of side plates are provided with at least one locking mechanism having a locking member and a locked member that can lock each other.

5. The molding frame according to claim 4, characterized in that the plurality of locking mechanisms provided on all pairs of side plates share a common operating section.

6. The molding frame according to any one of claims 1 to 5, characterized in that at least two or more adjacent side plates are connected by means that can change the distance between them.

7. The molding frame according to any one of claims 1 to 6, characterized in that at least one pair of the side plates have fixing means for maintaining a state separate from the middle frame.

8. The molding frame according to any one of claims 1 to 7, characterized in that only one of the end plates has the end plate clamp connected to one end of the connecting member, and the other end plate is connected to the other end of the connecting member.

Images