JP3016125B2 - Formwork for molding concrete pipe for manhole and molding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for molding a concrete pipe for manholes and a method for molding a concrete pipe for manholes using the same.

[0002]

2. Description of the Related Art Conventionally, as a method of molding a concrete pipe for manholes to which a step fitting is fixed, FIGS.
As shown in FIG. 4, the left and right ends of a step metal fitting 44 having a U-shape in plan view are welded to two metal pillars 42 arranged at a distance from each other, and these pillars 42 are connected to an outer frame 47 and an inner frame 47. Formwork 4
5, and then the step fitting 44 is inserted into the lateral hole 41 of the movable auxiliary mold 40 constituting a part of the inner mold frame 45, and the step fitting 44 is inserted into the step fitting 44. After the lateral hole 41 is sealed by the attached lid 46, there is a method of putting a concrete material into the molding space 43, applying vibration to the material, compacting the material, and removing the material.

[0003]

However, it is necessary to provide the pillar 42 for welding the step fitting 44 in the concrete material, and the auxiliary mold 4 for holding the step fitting 44 is required.
It takes time and effort to set up and leave 0.

Accordingly, the present invention has been made to solve the above-mentioned problems, and there is no need to provide a support for a step fitting in a concrete material, and an auxiliary die for holding the step fitting is easily provided and a manhole concrete pipe is easily removable. An object of the present invention is to provide a molding form and a method for molding a concrete pipe for manholes using the same.

[0005]

In order to achieve the above object, a formwork for molding a concrete pipe for manholes according to the present invention has an opening formed in a part of an outer surface of an inner form, and the opening is formed in the opening. An auxiliary die is fitted so as to be able to advance and retreat in the horizontal direction, and the auxiliary die has an outer surface plate having an opening for inserting a step fitting on the front surface, a fixed clamp plate disposed on the inner surface side of the outer surface plate, and A clamp mechanism for clamping the step fitting inserted into the opening by the movable clamp plate, and a holding drive device for driving the clamp mechanism are provided. Inside the inner mold, the auxiliary mold is provided. An elevating mechanism for elevating between an upper position above the top surface of the formwork and a lower position where the top surface of the auxiliary mold coincides with the top surface of the inner formwork; Hold the auxiliary mold with the front of the auxiliary mold inside. A forward position coinciding with the outer periphery of the frame, between the manhole concrete pipe retracted position possible withdrawal with step brackets after casting and is characterized in that a and reciprocating mechanism for advancing and retracting.

Further, according to the method for molding a concrete pipe for manholes according to the present invention, an opening is formed in the outer surface of the inner mold, and an auxiliary mold which moves in a horizontal direction by an advance / retreat mechanism is fitted into the opening. The auxiliary type has an outer plate having an opening through which a step fitting can be inserted in the front, and a clamp mechanism for clamping the step fitting with a fixed clamp plate and a movable clamp plate provided on the inner surface side of the outer plate. By inserting a step fitting into the opening and clamping it with a clamp mechanism, the rear end of the step fitting projects into a space formed by the inner mold frame and the outer mold frame, and a concrete material is struck into the space. After setting and tightening to the extent that it can be removed or moved by applying vibration, the clamp of the step fitting is released, and the top surface of the auxiliary mold is higher than the top surface of the inner mold. Located raised by the elevating mechanism,
The auxiliary mold raised to the upper position by the lifting mechanism,
By the advance / retreat mechanism, the auxiliary mold is retracted from a forward position where the front surface coincides with the outer periphery of the inner mold form to a retractable position where a concrete pipe for manholes with step fittings can be pulled out,
Thereafter, the inner mold frame and the outer mold frame are removed.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3, reference numeral 1 denotes an inner mold for forming a concrete pipe for manholes;
It has an outward flange 2 on the lower outside and is installed on a vibration table (not shown). A recess 3 is formed as an opening in one side of the inner mold frame 1 from the upper end to a position just before the lower outward flange 2. An auxiliary mold 4 for supporting the step metal fitting is fitted into the recess 3, and the outer surface thereof is formed so as to be a part of the outer peripheral surface of the inner mold 1.

Reference numeral 5 denotes a ring-shaped pallet fitted to the outside of the inner mold 1, and is mounted on the outward flange 2 of the inner mold 1. Reference numeral 6 denotes an outer frame, the lower end of which is supported by the pallet 5. Reference numeral 7 denotes a pallet clamp.

In FIG. 2 to FIG. 4, an auxiliary mold 4 has an outer surface plate 8 having an inverted L-shaped vertical section, and a movable clamp slidably arranged vertically along the inner surface of the outer surface plate 8. And a plate 9.

The outer plate 8 has two openings 10 at upper and lower positions for forming a clamp portion of a step fitting at the front thereof, and a fixed clamp plate 11 is provided at the upper half of the inner surface of each opening 10.
Has been fixed. Therefore, this fixed clamp plate 1
1 and the movable clamp plate 9 are located at the same surface position, and the step fitting 13 can be clamped (nipped) by the semicircular concave portions 12 of both vertically facing each other.

Each of the upper and lower movable clamp plates 9 has a support plate 14 extending inward in the horizontal direction.
Has a concave holding portion 15 for the crown portion of the step fitting 13. And, both movable clamp plates 9
Are connected to each other by a connecting member 16, and a piston rod 18 of a holding hydraulic cylinder 17 as a holding driving device fixed to the outer surface plate 8 is fixed to the lower movable clamp plate 9. The clamp plate 9 is configured to be able to open and close with respect to the fixed clamp plate 11 at the same time. In short, the movable clamp plate 9, the fixed clamp plate 11, and the holding unit 15 constitute a clamp mechanism 19 for the step fitting 13, and are driven by the holding hydraulic cylinder 17. FIGS. 5A and 5B show a state where the clamp mechanism 19 is closed, and FIGS. 6A and 6B show a state where the clamp mechanism 19 is opened.

In the inner mold 1, there is provided a reciprocating mechanism 20 for reciprocating the auxiliary mold 4 in the recess 3 together with the outer surface plate 8, the clamp mechanism 19 and the holding hydraulic cylinder 17.

The auxiliary mold 4 is supported by side plates 21 on both sides thereof, and a lower portion of the side plate 21 is movably supported on rails 23 fixed in the inner mold 1 via rollers 22. I have. The side plates 21 are connected to each other by horizontal members 24 and 25 arranged vertically, and the horizontal member 24 is pivotally connected to a front end of a connecting rod 26 extending in the front-rear direction. Is pivotally mounted on the upper end of a triangular lever 27 pivotally supported by a shaft 28 located on the opposite side of the auxiliary mold 4 in the inner mold 1. The lower end of the triangular lever 27 is connected to the piston rod 2 of the hydraulic cylinder 30 for advance / retreat as a drive device for advance / retreat.
9 is pivoted.

Therefore, when the triangular lever 27 is pulled down by driving the hydraulic cylinder 30 for advance and retreat, and is rotated clockwise in FIG. 3, the auxiliary mold 4 is guided by the rail 23 by the movement of the connecting rod 26. It is pulled rightward in FIG. 3 and moves backward. Conversely, when the triangular lever 27 is pulled up by the hydraulic cylinder 30 for advance / retreat, the triangular lever 27 rotates counterclockwise in FIG.
The auxiliary mold 4 is driven leftward in FIG. 3 while being guided by the rails 23 by the movement of.

In this advancing / retreating operation, in order to prevent the top surface 4a of the inverted L-shaped auxiliary mold 4 from colliding with the top surface 1a of the inner mold 1, the top surface 4a of the inverted L-shaped auxiliary mold 4 is prevented. Is slightly raised by the lifting mechanism 31. In this embodiment, the elevating mechanism 31 is constituted by an elevating hydraulic cylinder 32 (FIGS. 7 and 8) that elevates and lowers the auxiliary mold 4 integrally with the rail 23.
a is moved up and down between an upper position where a is above the top surface 1a of the inner mold 1 and a lower position where the top surface 4a of the auxiliary mold 4 coincides with the top surface 1a of the inner mold 1.

In this embodiment, the auxiliary mold 4 is constituted by the lifting hydraulic cylinder 32. However, as shown in FIG. 12, the auxiliary mold 4 may be constituted by providing a step 23a in the middle of the rail 23.

Next, a procedure for molding the manhole concrete pipe 33 shown in FIG. 11 using the above-described mold will be described.

First, a pallet 5 is set on an inner mold 1 mounted on a vibration table (not shown) by a crane or the like.

Then, a reinforcing bar (not shown) to which a spacer is attached in advance is set on the inner mold 1.

The inner mold 1 and the clamp mechanism 19 are in the state shown in FIG. That is, as shown in FIG. 6, the clamp mechanism 19 is in the open state in which the movable clamp plate 9 is lowered while the holding hydraulic cylinder 17 is not in operation, and the lifting hydraulic cylinder 32 of the lifting mechanism 31 is in the non-operating state. It is operating. That is, the auxiliary mold 4 is slightly elevated from the inner mold 1 as shown in FIG.

In this state, the step fitting 13 is manually set.
Is inserted into the semicircular concave portion 12 of the clamp mechanism 19, the crown portion (footrest portion) of the step fitting 13 is placed in the holding portion 15, and the “step holding close” switch is operated. And the hydraulic cylinder 32 for elevating and lowering are simultaneously operated, and the state as shown in FIG. 7 is established, so that the step fitting 13 can be fixed. That is,
In the clamp mechanism 19, since the holding hydraulic cylinder 17 operates, the movable clamp plate 9 is pushed up to a closed state, and the step fitting 13 is clamped by the movable clamp plate 9 and the fixed clamp plate 11. In addition, since the lifting hydraulic cylinder 32 of the lifting mechanism 31 operates, the auxiliary mold 4 descends, and the top surface 4a thereof is at the same height as the top surface 1a of the inner mold 1, and the outer peripheral surface of the inner mold 1 Are mostly occluded. The peripheral surface of the outer surface plate 8 of the auxiliary mold 4 is continuous with the peripheral surface of the inner mold 1.

Next, after the outer form 6 is suspended by a crane or the like and moved above the inner form 1, it is gradually lowered and fitted (set), and the hydraulic form clamp apparatus 34 (FIG. 3). Fix with. After that, the manual pallet clamp 7
The pallet 5 is also fixed by turning the lever (FIG. 1). This completes the assembly of the mold and the setting of the step fitting 13.

Next, the procedure from the start of casting to the completion of pressing will be described. Concrete material 35 is cast into a molding space formed between inner mold 1 and outer mold 6, and the upper end thereof is added. While pressing and compacting with a platen, the vibrating table is operated to apply vibration and to mold.

The mold after molding is in a state as shown in FIG. Here, when the "step holding open" switch is operated, both the clamp mechanism 19 and the elevating mechanism 31 are opened as shown in FIG. 8, and the clamp of the step fitting 13 is released.

After that, when the "assisting type moving open" switch is operated, the state shown in FIG. 9 is obtained, and a system for pulling out the outer die frame 6, the pallet 5 and the product upward is established. That is, the side plate 21 is pulled by the forward / backward hydraulic cylinder 30 via the triangular lever 27 and the connecting rod 26, and the auxiliary mold 4 is moved rightward (in the direction of the arrow) in FIG. Thereby, concrete pipe 33 for manhole
The auxiliary mold 4 is retracted inside the inner mold frame 1 while leaving the step metal fitting 13 fixed thereto.

When the outer formwork 6 is lifted by a crane or the like (FIG. 9), the manhole concrete pipe 33, which is a product, can be removed from the inner formwork 1 together with the outer formwork 6 while being placed on the pallet 5. It is possible to move to a demolding place or a curing place in this state.

After moving to the demolding site or curing site, the manhole concrete pipe 33 and the pallet 5 are left as products.
The outer mold 6 is removed from the mold and cured.

In the above-described embodiment, the case of a straight manhole concrete pipe as shown in FIG. 11 has been described. However, since the auxiliary type can retreat a considerable amount inward, the slightly inclined manhole concrete pipe is used. The mold and method of the present invention can be applied to pipes.

[0029]

As described above, according to the first embodiment of the present invention, the auxiliary plate fitted to the inner frame is provided with the outer plate, the clamp mechanism, and the holding driving device. In the mold, a lifting mechanism for raising the auxiliary mold to an upper position where the top surface thereof is higher than the inner mold, and retracting the auxiliary mold to a retractable position at which a manhole concrete pipe with a step metal fitting can be pulled out. With the reciprocating mechanism, during molding,
The step fitting can be held by the clamp mechanism.

Therefore, according to the present invention, it is not necessary to provide a support for the step fitting in the concrete material, and the concrete pipe for manhole with the step fitting can be easily manufactured.

After the molding, the auxiliary mold is raised to the upper position by the elevating mechanism simultaneously with the release of the clamp of the step fitting by the clamp mechanism, and the top surface thereof is positioned above the inner mold frame. The auxiliary mold can be retracted to the retracted position at which the manhole concrete pipe with the step fitting can be quickly pulled out.

Accordingly, the auxiliary mold for holding the step fitting can be easily installed and detached, and the outer mold frame can be easily removed, which is suitable for mass production.

In use, since the top surface of the auxiliary mold coincides with the top surface of the inner mold, there is a concern that sewage, cement paste or dust will flow into the inner mold and contaminate the internal devices. And there can be no failure caused by them.

According to the molding method of the second aspect, an opening is formed in the outer surface of the inner mold frame, and an auxiliary mold that moves in a horizontal direction by an advance / retreat mechanism is fitted into the opening. An outer plate having an opening through which a step fitting can be inserted,
A clamp mechanism for clamping the step fitting is provided, and the step fitting is inserted into the opening and clamped by the clamp mechanism, so that the rear end of the step fitting is placed in the space formed by the inner mold and the outer mold. After projecting and placing a concrete material in the space and compacting it, the clamp of the step fitting is released, and the auxiliary mold is raised and lowered to the upper position where the top surface is higher than the top surface of the inner mold. The auxiliary mold raised to the upper position by the elevating mechanism is moved up and down by the advance / retreat mechanism, from the advanced position where the front surface of the auxiliary mold coincides with the outer periphery of the inner mold, a concrete pipe for manholes with a step metal fitting is formed. Since the inner mold and the outer mold are removed to the retractable retractable position and then the inner mold and the outer mold are removed, the step fitting is also closed during the molding according to the method of the second aspect. It can be held by up mechanism.

Accordingly, there is no need to provide a support for the step fitting in the concrete material, and a concrete manhole tube with a step fitting can be easily manufactured.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a molding form of a concrete pipe for manholes of the present invention.

FIG. 2 is a plan view showing a part of the configuration of the molding frame of FIG.

FIG. 3 is a longitudinal sectional view of the molding form of FIG. 1;

FIG. 4 is a longitudinal sectional view of a part of the auxiliary mold.

FIGS. 5A and 5B are diagrams showing a closed state of a clamp mechanism in a molding mold, wherein FIG. 5A is a front view of an outer plate, and FIG. 5B is a side view thereof.

FIGS. 6A and 6B are views showing an open state of a clamp mechanism in a molding mold, wherein FIG. 6A is a front view of an outer surface plate, and FIG. 6B is a side view thereof.

FIG. 7 is a cross-sectional view of the mold showing a state where the auxiliary mold is at a lower position.

FIG. 8 is a cross-sectional view of a mold frame showing a state where an auxiliary mold is at an upper position.

FIG. 9 is a cross-sectional view of the mold frame showing a state where the auxiliary mold is at a retracted position.

FIG. 10 is a cross-sectional view of the mold showing a state when the outer mold is removed.

FIG. 11 is a longitudinal sectional view of a concrete pipe for manholes.

FIG. 12 is a view showing a main part of another embodiment of the lifting mechanism according to the present invention.

FIG. 13 is a plan view of an essential part of a conventional concrete pipe molding form.

14 is a cross-sectional view of the conventional molding die shown in FIG. 13 taken along line XX.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 inner mold 1 a top surface 2 outward flange 3 recess 4 auxiliary mold 4 a top surface 5 pallet 6 outer mold 7 pallet clamp 8 outer plate 9 movable clamp plate 10 opening 11 fixed clamp plate 12 semicircular recess 13 step fitting 14 support Plate 15 Holder 16 Connecting member 17 Hydraulic cylinder for holding down (driving device for holding down) 18 Piston rod 19 Clamp mechanism 20 Advance / retreat mechanism 21 Side plate 22 Roller 23 Rail 23a Step section (elevating mechanism) 24, 25 Cross member 26 Connecting rod 27 Triangle Lever 28 Shaft 29 Piston rod 30 Hydraulic cylinder for forward / backward movement (drive device for forward / backward) 31 Lifting mechanism 32 Hydraulic cylinder for lifting / lowering (lifting mechanism) 33 Concrete pipe for manhole 34 Hydraulic form clamp device 35 Concrete material 40 Auxiliary type 41 Side hole 42 Prop 43 Space for molding 44 Step bracket 45 Inner form 46 Lid 47 Outer form

Claims (2)

(57) [Claims] An opening is formed in a part of an outer surface of an inner mold, and an auxiliary die is fitted into the opening so as to be able to advance and retreat in a horizontal direction, and a step fitting is inserted into the front of the auxiliary die. An outer plate having an opening for performing the operation, a clamp mechanism for clamping a step fitting inserted into the opening by a fixed clamp plate and a movable clamp plate disposed on the inner surface side of the outer plate, and a presser for driving the clamp mechanism. A driving device is provided inside the inner mold, wherein the auxiliary mold has an upper position whose top surface is higher than the top surface of the inner mold, and a top surface of the auxiliary mold has a top surface of the inner mold. An elevating mechanism for elevating between the lower position and the auxiliary mold raised to an upper position by the elevating mechanism,
An advanced position in which the front surface of the auxiliary mold coincides with the outer periphery of the inner mold;
A formwork for forming a concrete pipe for manholes, comprising: an advancing / retracting mechanism for advancing and retreating the manhole concrete pipe with step fittings after the casting from a retractable position at which the concrete pipe can be pulled out. 2. An opening is formed in the outer surface of the inner mold frame, and an auxiliary mold that moves in a horizontal direction by an advance / retreat mechanism is fitted into the opening, and a step fitting can be inserted into the front of the auxiliary mold. An external plate having an appropriate opening, and a clamp mechanism for clamping the step fitting by a fixed clamp plate and a movable clamp plate disposed on the inner surface side of the external plate are provided, and the step fitting is inserted into the opening by the clamp mechanism. By clamping, the rear end of this step fitting is projected into the space formed by the inner mold and the outer mold, and a concrete material is poured into the space and vibrated to remove or move. After compacting to the extent, the clamp of the step fitting is released, and the auxiliary mold is raised by the lifting mechanism to the upper position where the top surface is higher than the top surface of the inner mold frame. The auxiliary type raised to
By the reciprocating mechanism, the auxiliary mold is retracted from a forward position where the front surface of the auxiliary mold coincides with the outer periphery of the inner mold to a retractable position where the concrete pipe for manholes with step metal fittings can be pulled out. A method for molding a concrete pipe for manholes, comprising removing the pipe.