JPH021301A - Manufacture of concrete product and forms used therefor - Google Patents

Abstract

PURPOSE:To make spacer unnecessary and reduce manufacturing cost by supporting reinforcing steel on the supporting pins in a forms, then casting a concrete material and performing a vibrating compaction, and then withdrawing each supporting pin, and removing the forms after the concrete is cured. CONSTITUTION:A hollow supporting pin 4 penetrates through the through hole 5 of a forms 1 and the outer through hole 7 of a reinforcing forms 1C. An actuation device for advancing and receding the supporting pin 4 is of a construction wherein left and right wedge plate 13 are provided at the outside of a forms A and the front and rear lateral bars 12a of a U-shaped movable forms 12 loosely fitted for freely advancing and receding in left and right directions, and the tip part thereof is provided facing the rear side surface of a flange 14 mounted outwards on the supporting pin 4 for freely extracting and inserting. After the reinforcing steel 15 is inserted into the forms A and held at a predetermined position, a concrete material is cast into the forms A and subjected to vibration, and the supporting pin 4 is withdrawn in a compacting state being advanced while keeping the vibration, and the upper surface is conditioned so as to bury reinforcing steel, and then remove the forms.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for manufacturing concrete blocks, concrete pipes, etc., and a formwork used in the manufacturing method, and particularly relates to a method of manufacturing concrete blocks, concrete pipes, etc., and a formwork used in the manufacturing method. This relates to a manufacturing method and formwork that enable accurate embedding.

(Conventional technology) Conventionally, when manufacturing concrete blocks, etc., it is stipulated that the outer ends of the reinforcing bars are buried at a certain distance from the outer surface of the product. After positioning the reinforcing bars, install plastic spacers at intervals so that their lower ends are supported on the bottom plate inside the formwork, and the outer ends of the spacers are engaged with the inner wall surface of the formwork. Compaction is performed by putting concrete into a formwork and vibrating the formwork to vibrate the concrete, or by vibrating the concrete material in contact with the concrete.

(Problems to be Solved by the Invention) However, this relatively conventional manufacturing method and mold had the disadvantage that the end face of the spacer was exposed on the surface of the product, resulting in poor appearance. Furthermore, if the spacer is made of iron, rust may ooze out onto the surface of the product even if the end is covered with a cap made of rubber or the like. Furthermore, in the conventional case, a large number of spacers had to be fixed around the outer periphery of the reinforcing bars, which had a large impact on manufacturing costs.

(Means for Solving the Problems) The present invention was developed in order to solve this conventional problem, in which a plurality of support pins are spaced from the outside toward the inside and are spaced by a predetermined length. After inserting reinforcing bars into the protruding formwork and supporting the reinforcing bars on support pins, concrete is poured into the formwork and is vibrated so that compaction progresses, and the support pins are moved back. , a method for manufacturing a concrete product in which the inner end thereof is aligned with the inner wall surface of the formwork and demolded, and a plurality of support pins are penetrated through the formwork so as to be freely retractable from the outside to the inside, and the outside of each support pin is This invention relates to a formwork used in a method for manufacturing concrete products, which is equipped with an actuation device that moves the formwork forward and backward.

When the support pin moves forward, it protrudes into the formwork by a certain length, and when it moves back, the inner end matches the inner wall surface of the frame body, thereby determining its stroke. Further, in addition to the case of the first embodiment, the movement of the support bins may be performed using an air or hydraulic cylinder provided at the outer end of each support bin. Furthermore, since the internal pressure of the concrete material acts on the support pin, it is also possible to make use of this force so that when the pressing force of the first actuating device is removed, the support pin will naturally retreat.

In addition, when supporting reinforcing bars on support pins provided on the frame of the formwork, there is a risk that the reinforcing bars may move horizontally.
It is desirable to provide the reinforcing steel with a support to prevent it from slipping in advance, and to lock this into the support pin.

(Function) Since this device has the above-described structure, reinforcing bars are inserted into the formwork while each support pin is advanced by the actuating device, and the outer part of the reinforcing bar is supported by the protruding part of the support pin. After that, set it on the forming table, put the concrete into the form and perform vibration compaction, move each support pin back, and align the inner end with the inner wall of the form. Once demolded, a concrete product with reinforcing bars embedded at a predetermined distance from the surface is obtained.

In addition, as the support pin retreats, a cavity is likely to be formed in the concrete in that area, but due to the internal pressure of the concrete or the vibration of the concrete,
In addition, in the case of soft concrete, due to its fluidity, this cavity collapses at the same time as the support pin retreats, leaving no trace behind.

(Example 1) Next, an example of the present invention will be described based on FIGS. 1 to 6. A is a metal formwork consisting of a frame 1 and a bottom plate 2; Both front and rear frame boards are 1m.

1a and both left and right frame plates 1b, I will support you freely. Reference numeral 4 indicates a hollow support pin, which is attached to both the front and rear frame plates 1a of the frame body 1.

1&, through-holes 5.5 formed on both left and right sides of the reinforcing frame IC, and through-holes 7 of the case 6 fixed to the outside of the reinforcing frame IC. Reference numeral 8 is a spring inserted into the hollow support pin 4, and its front end is locked to a shaft 9 provided at the front side of the support pin 4, and the rear end thereof is a shaft 10 provided at the rear part of the support pin 4.
It is locked in. This shaft 10 passes through long holes 11 provided on both sides of the support pin 4 and has both ends fixed within the case 6. S is an actuating device that moves each support bin 4 forward and backward at the same time. This actuating device is attached to the front and rear side rods 12 of a U-shaped movable frame 12 that is loosely fitted to the outside of the formworker so that it can move forward and backward in the left and right directions.
&, 12B is provided with both left and right whip plates 13, the tips of which are placed opposite to the rear side of the support pin 4 so that they can be freely inserted and removed. Reference numeral 15 denotes a reinforcing bar inserted into the formwork A, in which a plurality of auxiliary bars 15b are stacked on top of a plurality of main bars 15a in a lattice pattern, and their intersections are in contact with each other. Reference numeral 16 denotes a support made of metal wire that is fixed to the left and right sides of the main reinforcement 15a on both the front and rear sides, and as shown in Fig. 6 (1), the rear bent portion 16 & is fitted into the main reinforcement 15 & K to form this support. The parts are welded together and the inverted U-shaped receiver is part 1.
6 Form b and b. This support 16 is shown in FIG. 6 (2).
As shown in FIG. 2, another bent portion 160 may be provided at the rear end and this may be fitted to the auxiliary reinforcement 15b. In this case, the support 16 supports the movement of the main reinforcement 15a in the axial direction and the main reinforcement 15 &
Since rotation in the circumferential direction of the main reinforcement 15 is prevented, it may not be necessary to make contact with the main reinforcement 15. Further, this support may be formed by pressing a metal plate, or may be formed by molding a cast metal or plastic.

The first embodiment of the present invention has a more detailed structure than the above, and as shown in FIG. If, each PA
The plate 13 bites into the rear side of the 7 lange 14, and the spring 8
The support pin 4 is moved forward against the elasticity of the
As shown in Figs. 3 to 3, it is made to protrude a certain length into the formwork A. Next, the reinforcing bars 15 are inserted into the formwork A and fitted between the front and rear support bins 4, and the receiving portions 16b of each support tool 16 are fitted to the tips of the supporting pins 4, and the reinforcing bars 15 are inserted into the formwork A. After holding the concrete at a predetermined position within the frame 1, concrete is poured into the formwork A and vibrated. When compaction has progressed, the support pins 4 are moved back while vibrating, and the upper surface is 1111
After L&, demold.

In the above embodiment, by fitting the receiving part 16b of the support tool 16 to the support pin 4, the reinforcing bar 15 is positioned in the vertical direction and in the horizontal direction in FIG. Although the reinforcing bar 150 is positioned in the front-rear direction by directly engaging the tip with the reinforcing bar 15, the support 1
The receiver 6 may be provided with a locking portion in the portion 16b that engages with the tip of the support pin 4 to position the reinforcing bar 150 in the front-rear direction.

In the above embodiment, the support bins 4 were provided on both the front and rear frame plates 1a, la of the frame 1, but in the case of concrete blocks made of cedar wood as shown in Fig. 7 (1), (2), and (3), the frame One or more support pins 4 are provided on each of the front, rear, left, and right sides of the reinforcing bar 15.
It is preferable to support In this case, as a support for preventing the reinforcing bars 15 from shifting in the horizontal direction, a protrusion 17 protruding from the reinforcing bars 15 may be used as shown in FIG. 8, and this may be engaged with the side surface of the support pin 4. . - Depending on the shape of the concrete product, support pins 4 may be provided on the bottom plate 2 of the formwork.

(Example 2) Next, an example of manufacturing a concrete pipe is shown in Fig. 9.
To explain based on FIG. 10, 21& is the outer mold, and 21
b is a middle mold inserted into and removed from the outer mold 21. 241 is a support pin for lateral positioning of the reinforcing bar 35, which is inserted into the slits 25 formed at intervals in the circumferential direction at the upper and lower positions of the outer mold 214 so as to be freely protrusive and retractable from the outside to the inside. ing.

The height h of the inner end of this support bin 24a is formed to be slightly longer than the width p of 351 ml of horizontal stripes between the spirals in the reinforcing bar 35, so that when moving forward, the horizontal strips 35 of the spiral strips 7
It is formed to engage the outside of the turtle. 24 b is a support bin for vertical positioning of the reinforcing bar, outer mold 21
Through holes 25 are drilled at intervals in the circumferential direction at the top of &.
b is inserted so that it can freely protrude and retract from the outside to the inside. The outer ends of the support pins 24 & 24 b are connected to actuating devices such as air cylinders for moving them back and forth. ``Subaira /L/(length horizontal reinforcement 35&
are connected by a plurality of vertical stripes 35bK.

Since the second embodiment of the present invention has a more detailed structure as described above, as shown in FIGS. The support pin 24b for positioning in the direction and the support pin 24 for positioning in the direction are moved forward, the upper end of the reinforcing bar 35 is supported by the support pin 24b, and the outer side of the reinforcing bar 35 is held by the support bin 24&, and then the outer Concrete material is put in between 521& and medium size 21b, and it is vibrated. When compaction progresses, both support pins 21&, 21b are moved back and the vibration is stopped.

Smooth the top surface and remove from the mold.

In Examples 1 and 2 above, the point at which vibration is stopped depends on the hardness of the concrete material and the shape of the product.

Determined by the type of molding machine, etc.

(Effects) According to the present invention, as described above, the reinforcing bars can be held at a constant distance from the inner wall surface of the formwork using the support bins provided in the formwork so as to be able to move forward and backward.

Concrete products that meet standards can be manufactured without using a spacer as compared to the conventional method, and by omitting the spacer, the manufacturing cost of concrete products can be greatly reduced. In addition, when the support bin recedes, the cavity that is formed in that part disappears immediately due to the internal pressure of the concrete material, etc. Moreover, since the inner end of the support bin coincides with the inner wall surface of the formwork, the mold can be removed. If this happens, there will be no damage to the external surface of the concrete product or any traces of the supporting bins will remain.

Furthermore, since the tips of spacers and reinforcing bars do not protrude from the surface of the product and cause rust compared to conventional methods, it is possible to produce concrete products with a beautiful finish.

[Brief explanation of the drawing]

FIG. 1 is the first example of the present invention! j! FIG. 2 is a partially cutaway plan view showing the main parts of the same embodiment as above; FIG. 3 is a vertical sectional view taken along line X-X shown in FIG. 2; FIG. 6 is a plan view showing the support pin in the retracted state in the above embodiment, FIG. 5 is a partially cutaway plan view showing the main part of the support pin in the retracted state, and FIGS. A perspective view showing the holding state of reinforcing bars in Figure 7 (1) (2
) (3) is a perspective view showing another concrete product, No. 8
The figure is a longitudinal cross-sectional view of the above-mentioned embodiment when another support is used, FIG. 9 is a longitudinal cross-sectional view showing the second embodiment of the present invention, and FIG. 10 is a Y-Y line shown in FIG. 9. Cross-sectional view of. Mu: Formwork 1: Frame body 1 a: ! LiJ rear both frame boards 1b: both left and right frame boards 4
: Support bin 8 Nispring S: Actuation device [! l 12: Movable frame 13: ↑Trade board 14: ゛Flange 15: Reinforcing bar 16
: Support 211: Outer mold 21b: Medium mold 241k, 24b: Holding pin 35: Reinforcing bar Application agent Hisashi Matsumoto Fig. 5a Takemoto Fig. + 5a B Fig.

Claims (1)

[Claims] 1) A plurality of support pins are protruded at intervals and for a predetermined length into the formwork, and after the support pins support the reinforcing bars, concrete material is poured into the formwork, A method for producing a concrete product, which comprises vibrating the concrete product to advance compaction, and then retracting the support pin so that its inner end coincides with the inner wall surface of the formwork to remove the form. 2) Used in a method for manufacturing concrete products, characterized in that a plurality of support pins are passed through the formwork so that they can freely protrude and retract from the outside to the inside, and an actuating device for advancing and retracting the support pins is provided on the outside of each support pin. Formwork.