JPH0620739B2 - Formwork for concrete pipes - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a formwork used for forming a concrete pipe by vibration compaction, and more specifically, a foothold metal fitting or the like on an inner wall surface of the formwork when the formed pipe is formed. The present invention relates to a mold for molding a concrete pipe that integrally fixes bolts for installing a machine.

(Prior Art) As a mold for molding a concrete pipe to which a footrest is fixed, an opening is formed on the outer surface of a middle mold, and an auxiliary mold that moves horizontally in and out by a drive device is fitted into the opening. Inserting portions of the footrest fittings are provided at intervals in the vertical direction, and the rear end of the footrest fittings inserted into the inserting portion, that is, the portion to be embedded in the concrete material is placed in the molding space formed by the middle mold and the outer mold. It is publicly known that the metal fittings in the insertion portion are projected and supported by a fastening device provided in the middle mold.

(Problems to be solved by the invention) However, in this formwork, after the concrete material is vibrated and compacted so that it can be removed from the mold or moved, the auxiliary mold is retracted into the middle mold, and the foot is hung on the inner wall surface of the forming pipe. Since the metal fittings are exposed and then removed from the mold, the molding pipe is moved to the curing place together with the pallet.Therefore, the foot fittings may hang down when the mold is removed or when moving to the curing area, which may damage the concrete at that location. There is.

In particular, this auxiliary mold is of a type that is retracted into the middle mold, and in addition to the vibrator, a drive device for moving the auxiliary mold forward and backward must be provided inside the middle mold. Has the drawback that it cannot set a vibrator and that it is difficult to assemble each device. Moreover, there is a problem that the medium size becomes heavy and the vibration is not effectively transmitted to the concrete material. Further, sewage, cement paste, or dust flows into the middle mold through the gap between the opening formed on the outer side surface and the auxiliary mold, and each internal device is contaminated, which is also a cause of failure.

(Means for Solving the Problem) In order to solve the above-mentioned problems, a mold for molding a concrete pipe according to the present invention includes a middle mold having a vibrator installed therein and an outer mold removably inserted therein. A molding space is formed between the molding spaces, and a lower end of the molding space is closed by a pallet.In a mold for molding a concrete pipe, an auxiliary mold is removably erected on the pallet, and the auxiliary mold is formed on the outer side of the middle mold. Part of the outer surface of the middle mold by the outer surface of the auxiliary mold, and the auxiliary mold is provided with an insertion part for the attachment body to the concrete forming pipe, which is opened on the outer surface of the auxiliary mold. It was made.

(Operation) Stand up the auxiliary mold on the pallet in advance, insert and hold the mounting body such as the foot fitting in the insertion part of this auxiliary mold, insert it to the outside of the middle mold, and insert the auxiliary mold into the concave part of the middle mold. After mating, mating the outer mold, or supporting this outer mold on the pallet in which the auxiliary mold is erected, and simultaneously fitting these to the outside of the middle mold, and between the middle mold and the outer mold Forming a molding space,
The rear end of the mounting body is projected into this molding space.

In this state, put concrete material into the molding space, vibrate the entire formwork with the vibrator in the middle mold, uniformly vibrate the concrete material to compact it into a demoldable state, and press the top end to the pressure board. Then, pressure molding is performed and the vibrator is stopped.

After finishing the above molding process, after removing the outer mold and the middle mold in a reverse order to the order of assembling the molds, if the auxiliary mold is horizontally removed from the pallet, the inner wall surface It is possible to obtain a concrete pipe having a mounting body protruding.

(Embodiment) An embodiment of the present invention will be described with reference to FIGS. 1 to 4. Reference numeral 1 is a medium-sized base plate with a vibration isolator 3 at the bottom of a vertical hole 2 formed underground. Is installed horizontally and is detachably mounted on the base plate 4. A vibrator 5 is provided in the middle mold 1, and a lower end of a rotary shaft 6 thereof is linked to a motor 7 attached to the bottom of the vertical hole 2. A recess 8 is formed on one side of the middle die 1 from the upper end to the lower end.

Reference numeral 9 is a ring-shaped pallet fitted and inserted into the outside of the middle mold 1, and is supported on a support portion 10 that is provided around the outside of the lower part of the middle mold 1. Reference numeral 11 denotes an outer mold, the lower end of which is supported by the pallet 9 and the upper end of which is supported on the upper portion of the vertical hole 2 through the vibration isolator 3. Outer type
The lower end of 11 and the pallet 9 and the pallet 9 and the supporting portion 10 are
To prevent the concrete material from flowing out of the formwork,
They are connected in a sealed state. Reference numeral 12 is a molding space formed by the middle mold 1, the outer mold 11, and the pallet 9.

Reference numeral 13 denotes an auxiliary mold that is detachably erected on the pallet 9, and the auxiliary mold 13 is fitted into the concave portion 8 of the middle mold 1, and the outer surface thereof constitutes a part of the outer surface of the middle mold 1. There is. Further, the lower end of the auxiliary mold 13 has left and right receiving plates 14 projecting inward from the inner edge of the pallet 9 as shown in FIGS. 3 and 4.
A connecting plate (16) which is placed on the receiving plate (14) and is provided on one side of the receiving plate (14) so as to project from the lower end of the auxiliary mold (13) to a connecting pin (15) protruding in parallel therewith.
The left and right through holes 17 in are fitted into each other. Furthermore,
It is preferable to provide packing around the upper and outer ends of the auxiliary mold 13 to prevent the concrete material from entering the middle mold 1.

Although the upper surface of the corresponding surface between the recessed portion 8 and the auxiliary mold 13 may be a vertical surface, the auxiliary mold 13 can be easily attached and detached when the surface is widened and the lower end is slightly inclined. Becomes
Further, when formed in this way, since the corresponding surfaces are in close contact with each other and the vibration of the middle mold 1 is reliably transmitted to the auxiliary mold 13, the vibration and compaction of the concrete material are performed uniformly.

Reference numeral 19 denotes a pair of upper and lower foot fittings, which has a U-shaped planar shape and has embedded portions 19a formed at both ends. Reference numeral 20 denotes upper and lower insertion portions opened on the outer surface of the auxiliary mold 13. Since the insertion portion 20 has a wide outer opening and a narrow inner end, the footrest 19 can be easily inserted. The opening of the insertion section 20 is sealed by a horizontally long plastic cap 21 fitted to the rear part of the footrest fitting 19. This plastic cap is a metal fitting
It is to be fixed to a concrete pipe together with 19.

Reference numeral 22 denotes a fastener for a footrest fitting 19 formed in the rear part of the auxiliary mold 13, the central part of which is pivotally attached to the auxiliary die 13, and both ends of which are the inner end of the insertion part 20 and the footrest fitting 19 protruding therefrom. It fits in with the inner edge of the. Reference numeral 23 is a pressurizing plate equipped on the mold to be movable up and down and retractable in the horizontal direction.

Although the auxiliary mold 13 in the above-mentioned embodiment is attached to the pallet 9 by a horizontally detachable connecting means, the auxiliary mold 13 and the pallet 9 are detachably connected to each other by using a magnetic force, and both are connected. In some cases, it can be separately inserted into the medium mold 1. Further, the footrest fitting 19 is configured to be held by the insert portion 20 by the fastener 22, but it may be held by the inner end of the insert portion 20 and the cap 21.

(Effect) Since the present invention is configured as described above, while the concrete material is vibrated and compacted, the auxiliary mold is attached to the forming pipe while the mold is removed and moved to the curing place. Since the movement of the mounting body is blocked, unlike the case where the auxiliary mold is immediately removed from the molding tube after molding and retracted into the middle mold,
The fixture will not sag and therefore the concrete in this part will not crack. Moreover, since it is possible to remove the auxiliary mold after the outer mold and the middle mold have been demolded, it is possible to wait for the initial time of the cement, so that a safer demolding work can be performed.

Particularly, in the case of the present invention, since it is not necessary to provide an extra device in the middle mold, it can be used for a mold having a small diameter and the assembly is easy. Further, unlike the conventional case, the medium size does not become heavy, so that the vibration of the vibrator can be effectively transmitted to the concrete material.

Moreover, the medium-sized concave portion in the present invention is a closed type,
Since dirty water and dust do not enter the middle mold, the inside can be easily cleaned and there is no risk of breakdown.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention, and FIG.
Sectional drawing of the AA line shown in a figure, FIG. 3 is a longitudinal cross-sectional view of the principal part in an Example same as the above, FIG. 1; Medium size, 2; Vertical hole, 5; Vibrator, 8; Recessed part, 9; Pallet, 11; Outer mold, 12; Molding space, 13; Auxiliary mold, 18; Foot fitting, 20; Insert part

Claims (1)

[Claims] 1. A mold for molding a concrete pipe in which a molding space is formed between a middle mold having a vibrator installed therein and an outer mold removably inserted outside thereof, and the lower end of the molding space is closed by a pallet. In the frame, an auxiliary mold is detachably erected on the pallet, and the auxiliary mold is fitted into a recess formed in the outer portion of the middle mold to form a part of the outer surface of the middle mold by the outer surface of the auxiliary mold. A mold for molding a concrete pipe, characterized in that the auxiliary mold is provided with an insertion portion for an attachment body to the concrete molding pipe, and this is opened on an outer surface of the auxiliary mold.