JP2957644B2 - Culvert block manufacturing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a culvert block provided with a rainwater inflow hole on an upper surface in a concrete secondary product manufacturing plant.

(Prior Art) A method of manufacturing a culvert block according to the prior art will be described with reference to FIG. Fig. a shows a state before curing, in which a cured culvert block B (hereinafter referred to as culvert B) is contained in a form. In order to remove the mold, first open the front end plate 20. , Open the left and right side plates 30 and 30 and
The lock between the 0 'and the lower core 50' is released, the width of the upper core 50 is reduced, the sliding is performed, and then the lower core 50 'is reduced as shown in FIG. The culvert B is lifted up in the direction of the arrow in Fig. D, taken out of the production line, and the demolding process is completed. When casting concrete, lower core 50 '
Is attached to the rear end plate 20 'and locked, and then the upper core 50
Is mounted on the lower core 50 'by sliding it, the cores are widened to the specified dimensions, the core is covered with a reinforcing wire mesh from the front, and the hole forming pins are attached to the formwork. 30 and the slab 20 are closed, and concrete is poured from the open part on the top of the formwork.
Compared with the production of U-shaped groove block (the core is fixed to the bottom of the formwork, it is driven from the top, and the mold is removed in the direction of the top.) Production efficiency was poor.

(Problems to be Solved by the Invention) The present invention eliminates the drawbacks of the prior art and provides a method of manufacturing a culvert block in which the production efficiency of a culvert having a rainwater inflow hole on the upper surface is improved to the level of a general U-shaped groove block. And contribute to industrial development.

(Means for Solving the Problems) In order to achieve the above object, the present invention relates to a core supporting beam which is hinged around a bottom portion so as to be freely openable and closable on left and right side plates of front and rear end plates and protrudes from the rear end plate. Support the core that can expand and contract in cross-sectional dimensions, cast concrete from the top opening of the formwork provided with a hole forming pin with a drawing mechanism interposed on the bottom part, and after curing, the front side plate left and right side plates Opening, retracting the hole forming pin to the bottom portion, reducing the core section, extracting the culvert block forward and removing the culvert while leaving the core in the formwork, and removing the culvert. It is a block manufacturing method.

(Operation) According to the culvert block manufacturing method of the present invention, when manufacturing a culvert having a rainwater inflow hole on the upper surface, the divided two cores are removed each time the culvert is removed (product is taken out from the formwork). The process of extracting and transporting from the formwork and the complicated process of transporting and assembling two cores to the formwork every time the concrete is poured in is eliminated, leaving the core itself inside the formwork. It has the function of removing the culvert to the front, leaving the hole forming pin raised after the reinforcing wire mesh is attached, and the hole forming pin can be pulled down (down) to the bottom part when removing the mold, dramatically increasing production efficiency. Has the effect of improving.

(Embodiment) FIG. 1 is a perspective view schematically showing a method of manufacturing a culvert block according to the present invention. FIG. 1A is a perspective view of a formwork K which is a part of the configuration, in which a front end plate 20 and left and right side plates 30 are shown open.
The front and rear end plates 20, 20 'and the left and right side plates 30 are hinged around the bottom portion 10 attached to the underframe 5 in an open / closed manner, and a core support beam 40 projecting from the rear end plate 30' (see FIG. The core 50, which can be expanded and contracted in cross section, is supported by a broken line (shown by a broken line). Fig. b is a perspective view showing a casting process, in which concrete C is cast from the upper surface opening K 'of the formwork K. In the drawing, M is a reinforcing wire mesh attached to the outer periphery of the core. FIG. 3C is a perspective view showing a step of removing the culvert B. After curing of the concrete, the front end plate 20 and the left and right side plates 30 are opened, and the cross section of the core 50 is reduced by an expansion mechanism 100.
Shows a method of manufacturing a culvert block in which a vacuum pad of a demolding machine adsorbs while leaving in a formwork K, and is demolded and carried forward. In addition, as a part of the form in the figure, the core of the present applicant's utility model registration application No. 17032 (former for manufacturing a culvert block) and a telescopic mechanism are used. A hole forming pin with a mechanism is provided.

FIG. 2 is a perspective view (when the cross section of the core is reduced) showing the configuration of the core 50 and the extension mechanism 100 of the present invention, and a part thereof is cut away. The core 50 supported from the inner upper surface by the core supporting beam 40 protrudingly provided on the rear end plate 20 'is made of an elastic body such as a steel plate having a C-shaped cross section and conforms to the right longitudinal direction without a step. Upper and lower joints are provided, reinforcing ribs 55 etc. are provided on the left side to increase rigidity and the right side retains elasticity within the elastic range, and upper connecting metal fittings are provided inside the upper joint 55 and lower joint 56 of the joints. Five
5 ', lower connection fitting 56' is provided. A plurality of bearings 105 are provided on the left side of the core, nuts 111 and 112 are screwed into two sets of screw shafts 110 in which a left screw L and a right screw R are threaded, and the front and rear screw shafts are connected in series. The bearings 105 are supported, and the holes at one end of each of the eight links 130 are axially mounted on the upper and lower sides of each of the four nuts, and the holes at the other end are assembled at the upper and lower sides of the cross joint 140 and axially mounted. Horizontal axis of cross joint 14
5, the left end hole of the bell crank 150 is axially mounted, and the center hole of the bell crank is attached to the lower connection fitting 56 'and the upper end hole 15
5 are respectively connected to the upper connection fittings 55 '. Also,
As the core 50 of the C-shaped cross section, a heat-resistant polymer resin, rubber, or the like can be partially used without departing from the spirit of the invention.

FIG. 3 is an explanatory diagram showing a cross section of the core when the telescopic mechanism is extended and contracted. By rotating the screw shaft 110 of FIG. 1A counterclockwise by the above-described configuration, the gap between the screwed nuts is opened, and the links that are axially attached to the nuts are cross joints 140.
To the left, and the bell crank 150
Starting to rotate counterclockwise with the 5 'shaft attachment point as the fulcrum, the lower connection part 56'
Is gradually pulled up and deformed and reduced at the lower right side of the core while ascending in the direction of the arrow in the figure, and then the upper connecting portion (upper joint) of the bell crank 150 is drawn. Finally, as shown in FIG. The lower joint of the child rises inside the upper joint to reduce the height and width. The two-dot chain line in Fig. B is the core size (contour line of the formed culvert) before reduction, and it can be easily removed from the mold because there is a gap, and the upper joint covers the lower joint. Therefore, fine powder and the like of concrete do not enter the core at the time of demolding, which is advantageous for easy maintenance and improvement of durability of the expansion and contraction mechanism and the joint. At the time of assembling the formwork, if the screw shaft is rotated clockwise, the core is restored to its original regular size (FIG. A).

FIG. 4 is a perspective view showing the outline of the hole forming pin retraction mechanism 200 of the present invention. The bottom portion 10 is provided with an arbitrary shape and an arbitrary number of through holes h (corresponding to rainwater holes), provided with hole forming pins corresponding to the through holes, and threaded a left screw L and a right screw R. A pair of screw shafts 210 are connected in series,
The lower hole of each link 240 is axially attached to the side surface of each nut 211, 212 screwed to each of the left and right threaded portions of the screw shaft 210 supported by the bearing portion 5b, and the upper hole is assembled. , The hole forming pin 220 (made of hard rubber, synthetic resin or metal, etc.)
Is axially mounted on the side surface of the mounting member 260 having the upright. With the above configuration, if the screw shaft 210 is rotated, the interval between the screwed nuts expands and contracts, and each hole forming pin 220 fixed to the mounting member via each shaft-attached link passes through the bottom portion. It goes up and down in parallel through the hole. G is a lifting guide for the mounting member.

FIG. 5 is a perspective view of the culvert B having the rainwater inflow hole H when the culvert B is used (turned over after manufacturing).

FIG. 6 is a process explanatory view of the present invention. Fig. a shows a casting process, in which a reinforcing wire mesh M is attached to the outer periphery of a core 50 stretched to a regular size, and the drawing mechanism 200 is rotated clockwise to form a hole forming pin 2.
Ascends 20 and closes the left and right side plates 30 and the front end plate 20, tightens the known tightening bolts 25 to tighten the entire formwork, pours concrete through the upper opening, and accelerates the hardening (hydration reaction) of the concrete In order to do this, cure with steam or the like. Fig. b is a view showing a demolding process after curing, loosening the known fastening bolt, opening the front end plate 20 and the left and right side plates 30 by 20 to 30 °, rotating the retraction mechanism 200 counterclockwise to retract the hole forming pin 220,
Rotating the telescopic mechanism 100 of the core counterclockwise to reduce the cross section of the core 50, the upper surface of the culvert (the bottom surface during use) is sucked by the vacuum pad of the demolding machine V, etc. 4 shows a demolding step for removing the mold.

(Effects of the Invention) As described in detail above, according to the present invention, the process of attaching and detaching the core and the hole forming pin itself, which is the most troublesome and time-consuming in manufacturing a culvert with a rainwater inflow hole, becomes unnecessary, and Since the culvert can be manufactured while the frame is set on the automation line, the transport path of the core and the core storage area are not required, work safety and production efficiency are improved, and the recent shortage of workers is eliminated, It has a great effect of contributing to industrial development, such as being able to be manufactured in a short time by being mixed with an automated line for U-shaped grooves (one cycle of casting and demolding every 3-4 minutes, our company).

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing a method of manufacturing a culvert block according to the present invention. FIG. 2 is a partially cutaway perspective view showing a configuration of a core and a telescopic mechanism which are a part of the configuration of the present invention. FIG. 3 is an explanatory view showing a cross section of the core at the time of expansion and contraction. FIG. 4 is a partially cutaway perspective view showing a configuration of a retraction mechanism for a hole forming pin of the present invention. FIG. 5 is a perspective view of a culvert with a rainwater inflow hole. FIG. 6 is an explanatory view of each step of the method of manufacturing a culvert block according to the present invention. FIG. 7 is an explanatory view of each step of the prior art. B ... Culvert block, K ... Form, V ... Demolder, 10 ...
… Bottom part, 20… Front wife, 20 ′ …… Back wife, 40…
Core support beam, 50 ... Core, 100 ... Expansion mechanism, 200 ... Retraction mechanism, 220 ... Hole forming pin.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI E01F 5/00 E01F 5/00

Claims (1)

(57) [Claims] A left and right side plate on the front and rear end plates is hinged around the bottom surface so as to be openable and closable, and a core supporting beam projecting from the rear end plate supports a core whose cross-sectional dimension can be expanded and contracted. Concrete is poured from the upper surface opening of the formwork provided with the hole forming pin with the retraction mechanism interposed, and after curing, the front side plate left and right side plates are opened, and the hole forming pin is retracted into the bottom portion, and A method of manufacturing an underdrain block, comprising reducing a cross section of the underdrain, removing the underdrain block forward while leaving the core in the formwork, and removing the undermold.