JPH08404B2 - Concrete block manufacturing 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 method for manufacturing various concrete blocks used for constructing an underdrain (box culvert or the like) or an open ditch, a fire protection water storage tank, a common ditch, an underground passage or an assembly garage.

[0002]

2. Description of the Related Art Large concrete block products such as box culverts are usually manufactured by placing concrete in a framed formwork. Explaining this, as shown in FIG. 9, the outer formwork 12 is provided on the bottom formwork 11 in correspondence with the size and shape of the target concrete block.
The inner mold 13 and the inner mold 13 are assembled to form the required mold 1. First, concrete k is poured into the bottom mold 11 to sufficiently fill the mold part corresponding to the bottom of the concrete block with concrete k, and then the arrow shown in the figure. As described above, concrete k is sequentially driven into the gap between the outer mold 12 and the inner mold 13 from above the mold 1 while applying vibration as necessary.
The inside of the mold 1 is completely filled with concrete k. And
After the concrete is hardened, the mold 1 is released from the mold, and the concrete block A as a product as shown in FIG. 10 is taken out.

Thus, the concrete block A to be manufactured has a connecting box 2 provided with an opening 2a necessary for connecting the concrete blocks A to each other as shown in FIG. In the case where the concrete block A is integrally provided in the fillet portions a) of the four corners, the opening 2a of the connecting box 2 as shown in FIG. The connecting boxes 2 are detachably attached to the inner mold 13 in a state of directly contacting the four inclined surfaces of the frame 13, and thereafter, between the inner mold 13 and the outer mold 12. Concrete k
When the concrete k is hardened, the mold 1 is demolded. Therefore, the connection box 2 is shown in FIG.
As shown in 0, the fillet portion a temporarily held by the inner formwork 13 is integrally encapsulated as the concrete k hardens, and the opening 2a is opened at a position continuous with the inner surface of the concrete block A. Can be finished. A general procedure for connecting the concrete blocks A to each other will be briefly described. The concrete blocks A to be connected are arranged adjacent to each other, and then a PC steel bar or the like is connected in the fillet portion a between both blocks. Insert the member B for
The openings b of the connecting box 2 of the concrete block A corresponding to the screw parts b provided at both ends of the connecting member B
Then, the nut inserted from the opening 2a is screwed into the threaded portion b so that the connecting member B is fixed to the inner end of the connecting box 2 through the nut. ing. The connecting box 2 has a through hole 2 for that purpose.
b is bored in the end plate portion and is sealed with a core or the like when the concrete k is poured.

[0004]

However, in such a manufacturing method, when the connecting box 2 is attached to the inner mold 13, the contact surface between the opening 2a and the inner mold 13 is entirely covered. It is difficult to make them adhere evenly, and a gap is likely to occur at that portion. Therefore, when placing concrete k,
As shown by the arrow in FIG. 11, the concrete k easily intrudes into the opening 2a through such a gap, and the opening 2a after the mold is removed.
If the solidified concrete k remains in a and is forced to be removed, or if it is so large that it is difficult to insert the connecting member B or attach a nut, the product life of the concrete block A itself is at risk. The situation may occur.

The present invention aims to solve these problems.

[0006]

The present invention takes the following means in order to achieve such an object.

That is, the method for manufacturing a concrete block according to the present invention is a method for burying a connecting box used for connecting concrete blocks together in the concrete block. , A rubber plate having a substrate part having a slightly larger area than the opening and a protrusion formed on the substrate part and closely fitted to the opening is attached to the lid, and then at one end.
Connect the middle part of the U-shaped bracket with the screw part to the connecting box.
Apply to the outer surface and connect the screw part of the metal fitting to the connection box
And the rubber plate and the inner frame, and a nut at the end.
The connecting box is removably attached to the inner mold via a rubber plate by tightening, then concrete is placed between the inner mold and the outer mold, and the mold is cured after the concrete is hardened. It is characterized by removing the mold and removing the rubber plate.

[0008]

According to such a manufacturing method, since the opening of the connecting box is reliably sealed by the rubber plate, it is possible to prevent concrete from leaching into the opening through the gap between the connecting box and the inner formwork when placing concrete. It can be surely prevented. For this reason, when the rubber plate is removed after the mold is removed, it becomes possible to expose the opening of a proper shape on the inner surface of the concrete block.

Moreover, there is no opening between the opening and the inner mold.
Remote and slightly wider substrate portion, and the projection that fits closely into the opening
The rubber plate provided with
Therefore, the opening of the connection box is the thickness of the substrate after demolding.
Retract inside and directly expose to the surface of the concrete block.
It will not be issued. Therefore, after connecting,
Fill the mortar etc. and completely connect the connecting box.
The connection box is effective from rust etc. if it is buried in the tissue.
Can be protected.

In addition, fixing the connecting box to the inner formwork
I put a U-shaped metal fitting on it and formed it at one end
This is done by screwing a nut onto the thread
It For this reason, simply screwing the nut onto the nut
Apply the tightening force via the U-shaped bracket
Effectively converted to the pulling force of the connecting box opening
It is possible to evenly press-contact the inner mold via the rubber plate.
Wear.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

The connecting box 2 used in this embodiment has a pentagonal cross section as shown in FIG. 2, and has a side plate portion 21, a swash plate portion 22, a top plate portion 23, and an end plate. And a rectangular opening 2a is formed at a portion corresponding to the bottom plate portion. Then, the rubber plate 3 shown in FIGS. 3 and 4 is attached to the opening 2a. The rubber plate 3 includes a substrate portion 31 having a slightly larger area than the opening 2a of the connection box 2 and a protrusion 32 formed on the substrate portion 31. The protrusion 32 and the connection are formed. The opening 2a of the box 2 is in a closely fitted relationship with each other. On the other hand, the connecting box 2 and the rubber plate 3 have holes 22a and 32a in the swash plate portion 22 and the protrusion 32, respectively, into which the U-shaped metal fitting 4 shown in FIG. Have A screw portion 41 is provided at one end of the metal fitting 4.

Next, a method of manufacturing a concrete block having the connecting box 2 will be described.

First, as shown in FIG. 6, the protrusion 32 of the rubber plate 3 is closely fitted into the inner circumference 2c of the opening 2a of the connecting box 2, and the connecting box 2 is inserted into the holes 22a and 32a.
The metal fitting 4 is inserted from the side of the swash plate portion 22 of FIG. At this time, the contact portion between the metal fitting 4 and the top plate portion 23 of the connection box 2 is connected via the welded joint 5. Next, as shown in FIG. 1, this connecting box 2 was attached to a required position on the outer surface of the inner mold 13 through the rubber plate 3, and at that time, the screw portion 41 of the metal fitting 4 was provided on the inner mold 13. The nut 6 is tightened by extending it to the inner surface of the inner frame 13 through a hole (not shown). After doing so, as shown in FIG. 9, the inner mold 13, the bottom mold 11, and the outer mold 12 are assembled to form the mold 1 having a required shape, and the outer mold 12 and the inner mold 13 are formed. Concrete k in the gap
To fill. After the concrete is hardened, the nut 6 is unscrewed to remove the mold 1 from the mold. At that time, the screw portion 41 of the unnecessary metal fitting 4 remains in the opening 2a of the connecting box 2 as a wreckage, and is cut off at a position substantially flush with the inner surface of the top plate portion 23 of the connecting box 2.

As a result, as shown in FIG. 10, the joint box is integrally encapsulated in the fillet portion a that was temporarily held by the inner formwork 13 as the concrete k hardens, and its opening 2a is covered with the concrete block. It can be exposed at a position continuous with the inner surface of A.

According to such a manufacturing method, the opening 2a of the connecting box 2 is reliably sealed by the rubber plate 3, and when the concrete k is poured, the opening is passed through the contact gap between the connecting box 2 and the inner formwork 13. The situation where concrete k invades into 2a is reliably prevented. For this reason, when the rubber plate 3 is removed after the mold is removed, the opening a having an appropriate shape can be exposed on the inner surface of the concrete block A, and as a result, this has the conventional manufacturing method. It is possible to reliably eliminate the above-mentioned trouble, that is, the trouble of removing the solidified pieces and re-doing the concrete k.

Moreover, between the opening 2a and the inner formwork 13,
The board portion 31 that is slightly wider than the opening 2a and the opening 2a
Via a rubber plate 3 having a protrusion 32 that fits closely
Since it is made to exist, the connection box 2 after demolding
The opening 2a of the substrate is retracted inward by the thickness of the substrate 31.
Do not expose it directly to the surface of concrete block A
You can leave it. Therefore, after connecting,
Complete the connecting box 2 by filling the mouth 2a with mortar etc.
Can be embedded in concrete structure and
It becomes possible to effectively protect the socks 2 from rust and the like.

In addition, the connection box 2 to the inner formwork 13
Fixing is done by applying the U-shaped metal fitting 4 and forming it at one end
It is performed by tightening the nut 6 on the threaded portion 41
The tightening force applied to the nut 6 is U-shaped.
The pulling force of the entire connecting box 2 is obtained through the metal fittings 4 of
To convert the opening 2a of the connecting box 2 into a rubber plate 3
Can be evenly pressed against the inner formwork 13 via
It Therefore, the connecting box 2 can be
It is possible to securely fix it to the inner formwork 13,
The mold can be easily made.

The present invention is not limited to the above embodiment. For example, instead of the metal fitting 4 used in the above embodiment, a bolt 7 as shown in FIG.
You may screw a nut on the inner surface of the inner formwork 13.
Further, the shape of the connecting box may be such that the end plate portion is rectangular. However, when the end plate portion has a hexagonal shape as in the above-described embodiment, interference with the reinforcing member embedded inside the concrete block is less likely to occur, which is effective. In addition, various modifications can be made to the cross-sectional shape of the rubber plate or the connecting box, or how to attach the rubber plate to the connecting box without departing from the spirit of the present invention.

[0020]

According to the method of manufacturing a concrete block according to the present invention, a rubber plate is temporarily interposed between the connection box and the inner form at the time of pouring concrete, and the opening of the connection box is reliably made by the rubber plate. It was sealed to prevent concrete from leaching into the opening. For this reason, when the rubber plate is removed after demolding, it is possible to expose an opening of a proper shape on the inner surface of the concrete block, and as a result, the work of removing the solidified concrete pieces is not required and High manufacturing can be performed. Further, according to such a manufacturing method, it is possible to retract the open end of the connecting box to the inside so that it does not appear on the surface of the concrete block, so that mortar or the like is put in the opening after the connection. Once filled, the junction box can be completely buried. Therefore, even if a connecting box made of iron or the like is used, it is possible to effectively prevent the generation of rust on the concrete surface. Moreover,
Fix the connecting box to the inner formwork by applying a U-shaped bracket.
When the nut is fastened to the thread formed on one end of the insulator
It's a very simple task
Therefore, it is possible to improve the stool related to mold assembly and demolding.
Sometimes, make sure that the connecting box is securely fixed to the inner formwork.
Excellent effect that can effectively improve product quality
The fruit is played.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention and showing a main part in a state in which a framework is finished.

FIG. 2 is a perspective view of a connection box used in the embodiment.

FIG. 3 is a plan view of a rubber plate used in the embodiment.

FIG. 4 is a front view of FIG.

FIG. 5 is a view showing a metal fitting used in the embodiment.

FIG. 6 is a diagram showing a procedure for mounting a rubber plate on a connection box in the embodiment.

FIG. 7 is a perspective view showing a state immediately before the connection box is attached to the inner formwork in the embodiment.

FIG. 8 is a diagram corresponding to FIG. 1 showing another embodiment of the present invention.

FIG. 9 is a view showing a general method for manufacturing a conventional concrete block.

FIG. 10 is a general perspective view of a conventional concrete block including a connection box.

FIG. 11 is a diagram corresponding to FIG. 1 for explaining a conventional defect.

[Explanation of symbols]

 A ... Concrete block a ... Fillet part B ... Connection member b ... Screw part k ... Concrete 1 ... Formwork 2 ... Connection box 2a ... Opening part 2b ... Insertion hole 2c ... Inner circumference 3 ... Rubber plate 4 ... Metal fitting 5 ... Welded joint 6 ... Nut 7 ... Bolt 11 ... Bottom form 12 ... Outer form 13 ... Inner form 21 ... Side plate 22 ... Swash plate 22a ... Hole 23 ... Top plate 24 ... End plate 31 ... Substrate 32 ... Projection Portion 32a ... Hole 41 ... Screw portion

Claims (1)

[Claims] 1. A manufacturing method for embedding a connecting box used for connecting concrete blocks together in the concrete block, wherein a substrate having an area slightly larger than the opening is first formed in the opening of the connecting box. Part and a rubber plate having a protrusion formed on the base plate part and closely fitted to the opening part, and a screw part is attached to one end of the plate.
The middle part of the U-shaped bracket with the
While applying the screw part of the metal fitting, connect the box, rubber
Penetrate the plate and inner formwork, and tighten the nut at the penetrating end.
By doing so, the connecting box is detachably attached to the inner mold via the rubber plate, after which concrete is placed between the inner mold and the outer mold, and the mold is removed after the concrete has hardened. A method for manufacturing a concrete block, which comprises removing a rubber plate.