JP3237530B2 - Method of manufacturing precast concrete member for wall construction - 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 producing a precast concrete member for constructing a hollow double wall used for constructing a reinforced concrete wall.

[0002]

2. Description of the Related Art Conventionally, in the construction of a reinforced concrete wall, it takes time to assemble and disassemble a formwork at a construction site. Then, a wall member made of precast concrete (PC) is manufactured and brought to the site. This PC wall member is a so-called hollow double-walled P which is formed by assembling two PC boards at an interval.
A C wall member, in which a wall reinforced cage is inserted into this hollow portion at a construction site, and concrete is filled and cast, whereby a reinforced concrete wall is constructed. Japanese Patent Publication No. Sho 61-34539 discloses a method of manufacturing a hollow double wall PC wall member of this type.

In this manufacturing method, as shown in FIG. 3, first, a truss bar C is inserted into a flat-framed PC board forming form D, concrete is cast, and then curing is performed. Thus, a semi-finished product E in which one PC board A is integrated on one surface of the truss bar C is manufactured. After that, the semi-finished product E is lifted up by a crane, removed from the mold, and further inverted to stand by. Next, concrete is cast into the formwork D again, and the semi-finished product E, which has been turned over, is driven into the cast concrete in a suspended state, and settled down with a vibrator so as to have a predetermined covering. In this state, the concrete is hardened and cured to produce a hollow double-walled PC wall member F in which the other PC board B is also integrated.

[0004]

However, in the above-mentioned conventional manufacturing method, a semi-finished product E in which one PC board A is integrated with a truss C, including concrete casting and curing, is used. It took almost a day. Further, it takes another one day to produce a finished PC wall member F in which the other PC board B is integrated with the semi-finished product E. Was required.

[0005] Further, the semi-finished product E comprising the truss bars C and one PC board A is pulled up, demolded and inverted, and further, when the semi-finished product E is driven into concrete, the semi-finished product E is cast.
There is also a problem that a separate crane facility is required for the operation of suspending the cranes, and the work by the crane facility is complicated and involves risks.

Further, in the work of integrating another PC board B with the semi-finished product E, while the concrete poured into the form D is leveled, the suspended semi-finished product E is The semi-finished product E is settled while being vibrated until a predetermined covering is obtained. However, it is difficult to adjust the depth of the semi-finished product E, and the thickness of the PC wall member F as a finished product is accurately obtained. There was also a problem that it was difficult.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and has as its object to reduce the time required for manufacturing a PC wall member while eliminating complicated work using a crane facility, and also to reduce the number of products. It is an object of the present invention to provide a method of manufacturing a PC member for wall construction, which can also improve the manufacturing accuracy of the PC.

[0008]

In order to achieve the above object, a method of manufacturing a PC member for wall construction according to the present invention is directed to a precast for wall construction in which a pair of precast concrete plates are disposed on both sides of a reinforcing bar cage. In the method for manufacturing a concrete member, concrete is poured into a form having at least the thickness of the precast concrete member for wall construction, and one side of the rebar cage is inserted, and the concrete is hardened to form one of the precast concrete members. plate to form, then sand while exposing the other side of the reinforcing bar cage sprinkling sand on one precast concrete slab on the
The mold is provided Rutotomoni, Seme steep rigid to sand surface of the sand mold
After mixing the sand mortar and compacting the sand mold,
It is characterized in that concrete is cast on a mold and cured to form the other precast concrete plate.

[0009] According to this manufacturing method, and Da設concrete at the bottom in the mold, the sand mold provided thereon, further a relatively short period of time in the procedure that concrete is on this sand mold The production process can be completed quickly, especially when using zero slump concrete, the production work can be performed very quickly, and it takes only half a day, including curing, to build one wall. A PC member can be manufactured, and the productivity can be dramatically improved.

Further, as described above, since the concrete casting operation, the mold installation operation, and the concrete casting operation are performed in order from bottom to top in the formwork, the crane equipment is conventionally required in the manufacturing process. There is no need to use complicated operations, and it is simple, safe and efficient for wall construction.
A C member can be manufactured.

Furthermore, since the concrete, sand mold , and concrete are stacked in order from the bottom in the formwork, the thickness can be inspected appropriately during the stacking process, and finally, the concrete is placed on the sand mold. At the time of casting, the thickness accuracy can be directly and easily controlled by the total thickness itself, and a PC member for wall construction with extremely high dimensional accuracy can be manufactured.

Particularly, in this manufacturing method, a sand mold is used.
Therefore, it is possible to protrude with a desired exposure amount easily the other side of the reinforcing bar cage on its surface while filling it without becoming reinforcing bar cage projecting from one PC board obstruct, it is easy to handle On the other hand, sufficient mold dimensional accuracy can be ensured, and the present invention can be widely applied to the production of PC members for wall construction having any specification dimensions. Also, sand-type sand
Mix the quick-hardening cement mortar on the top and tighten the sand mold.
To quickly solidify the sand top surface.
You. As a result, concrete can be cast above the sand mold.
You can move quickly.

[0013] In forming at least one of the PC boards, it is preferable that excess water is dewatered from the cast concrete. By performing dehydration, the production time can be further reduced.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a sectional configuration of a PC member for wall construction to which the present invention is applied, and FIG. 2 shows a manufacturing method according to the present invention.

This embodiment is basically a method of manufacturing a PC member 20 for wall construction in which a pair of PC plates 1 and 2 are disposed on both sides of a wall reinforcing cage 3 at least. The concrete 1a is poured into the side form 7 having a thickness of 20 and one side of the wall reinforcing cage 3 is inserted, and the concrete 1a is hardened to form one PC board 1,
Next, a mold is provided on one PC board 1 in a state where the other side of the wall reinforcing bar 3 is exposed, and then the concrete 2a is placed on the mold.
And hardened to form the other PC board 2. As a mold, a sand mold 10 formed by scattering sand on one PC board 1 is used. In the manufacturing process, when forming at least one of the PC boards 1 and 2, surplus water is dewatered from the cast concrete 1a and 2a.

The wall-building PC member 20 shown in FIG. 1 comprises two thin PC boards 1 and 2 and a wall reinforcing cage 3. Both sides of the wall reinforcing cage 3 are integrally embedded in the two PC boards 1 and 2, respectively.

In order to manufacture the PC member 20 for wall construction as described above, first, as shown in FIG. 2A, the PC member 20 placed on the bed 8 has a thickness equal to or greater than the thickness of the PC member 20. Concrete 1a is poured into the side mold 7 having a thickness, and the wall reinforcing cage 3 is horizontally inserted from above the concrete 1a. The concrete 1a may be cast after the wall reinforcing cage 3 is inserted into the side formwork 7 in advance, but the depth of the side formwork 7 is considerably deep, and the wall reinforcing basket 3 is formed. Considering that the concrete 1a may be soiled, it is preferable to cast the concrete 1a first. And one side of the wall reinforcing bar 3 is concrete 1a.
The concrete 1a is steam-cured and hardened in a state where it is settled inside, and one PC board 1 is integrally formed on one side of the wall reinforcing cage 3. At this time, the concrete 1a
In order to accelerate the hardening of the concrete 1a, vacuum dehydration is performed from the bottom surface 9 side.

The vacuum dehydration is performed by a conventional method. That is, by applying vacuum pressure of a vacuum pump to a vacuum mat placed on a concrete surface via a water separation tank, moisture unnecessary for hydration is suctioned and removed, and the concrete surface is pressed and solidified. ing. According to this vacuum dehydration, excess water can be significantly reduced,
Strength is increased and durability is increased. Furthermore, since the initial strength can be obtained, there is an advantage that the process can be shifted to a subsequent process at an early stage.

Next, as shown in FIG. 2B, sand is scattered on the upper surface of the PC board 1 made of the hardened concrete 1a.
The sand bar 10 is compacted while the wall reinforcing bar 3 is embedded therein to form the sand bar 10 while the other side is exposed from the upper surface 11 of the sand bar 10. At this time, casting mold sand is used. In addition, when hardening only the sand upper surface 11 quickly, mix a hard cement mortar into the sand at the relevant location.
You.

Further, as shown in FIG. 2 (c), concrete 2a is further poured into a space defined by the upper surface 11 of the compacted sand mold 10 and the side mold 7, and the other side of the wall reinforcing cage 3 is formed. In a state where the concrete 2a is embedded in the concrete 2a, the concrete 2a is steam-cured and hardened, so that the wall reinforcing cage 3
The other PC board 2 is integrally formed on the side opposite to the above. At this time, in the present embodiment, similarly to the case of the cast concrete 1a, the hardening of the cast concrete 2a is accelerated by vacuum dehydration from the upper surface 12 thereof.

When the concrete 2a is hardened, the side mold 7 is removed and the sand mold 10 is removed from between the PC plates 1 and 2, whereby the PC member 20 for wall construction can be obtained.

As described above, in the manufacturing method of the present embodiment, concrete 1a is cast at the bottom in the side mold 7 on the bed 8, the sand mold 10 is placed thereon, and the sand mold 10 is further placed.
The production process can be completed in a relatively short time by the procedure of placing concrete 2a on the concrete, and especially when zero slump concrete is used, the production operation can be performed very quickly. One wall construction PC member 20 can be manufactured in a short time of about half a day including curing, and the productivity can be dramatically improved.

Also, as described above, since the concrete casting operation, the sand mold installation operation, and the concrete casting operation are performed in order from bottom to top in the side mold 7, the crane is used in the conventional manufacturing process. There is no need to perform complicated operations using equipment, and the PC member 20 for wall construction can be manufactured simply, safely, and efficiently.

In addition, since the casting concrete 1a, the sand mold 10, and the casting concrete 2a are stacked in order from the bottom in the side mold 7, the thickness can be inspected appropriately during the stacking process. When the concrete 2a is finally cast on the sand mold 10, the thickness accuracy can be directly and easily controlled by the total thickness itself, and the wall construction PC having extremely high dimensional accuracy can be obtained.
The member 20 can be manufactured.

Furthermore, since the sand mold 10 is employed, the wall reinforcing bar cage 3 projecting from the lower PC board 1 fills the wall reinforcing bar cage 3 without disturbing the wall reinforcing bar cage 3. It can be easily projected with a desired exposure amount, and while being easy to handle, it can ensure sufficient mold dimensional accuracy, and can be widely applied to manufacture wall construction PC members 20 of any specification dimensions. can do. Further
Then, a hard cement mortar on the sand upper surface 11 of the sand mold 10
The sand surface of the sand mold 10 in order to compact the sand mold 10
11 can be hardened quickly. Thereby, sand mold 1
0 Promptly shift to concrete 2a casting work
can do.

Further, when forming the PC boards 1 and 2, the excess water is vacuum-dewatered from the cast concrete 1a, 2a, so that the production time can be further shortened.

[0027]

As described above, in the method of manufacturing a PC member for wall construction according to the present invention, concrete is cast at the bottom in a formwork, and a sand mold is placed thereon. The production process can be completed in a relatively short time by the procedure of casting concrete on the sand mold , and the wall construction P
The productivity of the C member can be dramatically improved.

In addition, since this is a manufacturing method in which concrete placing work, sand mold forming work , and concrete placing work are performed in order from bottom to top within the frame, complicated operations using crane equipment in the manufacturing process as in the prior art. Thus, the PC member for wall construction can be manufactured simply, safely and efficiently.

Furthermore, since the concrete, sand mold , and concrete are stacked in order from the bottom in the formwork, the thickness can be appropriately inspected during the stacking process, and finally, the concrete is placed on the sand mold. At the time of casting, the thickness accuracy can be directly and easily controlled by the total thickness itself, and a PC member for wall construction with extremely high dimensional accuracy can be manufactured.

Further , since the sand mold is used, the reinforcing bar basket protruding from one PC board is buried without obstruction, and the other side of the reinforcing bar basket is easily exposed on the surface thereof with a desired exposure amount. While being able to protrude, it is easy to handle, while ensuring sufficient mold dimensional accuracy, and can be widely applied to the production of PC members for wall construction of any specification dimensions. In addition, the sand is quickly hardened on the sand top
Mix the cement mortar and compress the sand mold.
The sand surface of the sand mold can be quickly solidified,
Quickly shifts to concrete casting work above the sand mold
can do.

In addition, when forming at least one of the PC boards, the excess water is dewatered from the cast concrete, so that the production time can be further reduced.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a PC member for wall construction targeted by the present invention.

FIG. 2 is an explanatory view showing a manufacturing process of a method for manufacturing a PC member for wall construction according to the present invention.

FIG. 3 is an explanatory view illustrating a conventional manufacturing method.

[Explanation of symbols]

 1, 2 PC board 1a, 2a Casting concrete 3 Wall reinforced cage 7 Side form 8 Bed 10 Sand mold 20 PC member for wall construction

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Koji Hamada 4-640 Shimoseito, Kiyose-shi, Tokyo Co., Ltd. Inside the Obayashi Corporation Technical Research Institute (72) Koji Watanabe 4-640 Shimoseito, Kiyose-shi, Tokyo Obayumi Corporation Inside the Technical Research Institute (72) Inventor Ichifusa Mitani 4-640 Shimoseito, Kiyose-shi, Tokyo Inside Obayashi Corporation Technical Research Institute (56) References JP-A-61-229053 (JP, A) JP-A-50-92917 ( JP, A) JP-A-56-120307 (JP, A) JP-A-6-47718 (JP, A) JP-A-53-117012 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , (DB name) B28B 21/00-23/22 B28B 7/00-7/46

Claims (2)

(57) [Claims] 1. A method of manufacturing a precast concrete member for wall construction in which a pair of precast concrete plates are disposed on both sides of a reinforcing steel cage, wherein at least a mold having a thickness of the precast concrete member for wall construction is provided. The concrete was poured and one side of the reinforcing bar was inserted, and the concrete was hardened to form one precast concrete plate, and then sand was scattered on the one precast concrete plate.
Ru provided sand mold in a state of exposing the other side of the reinforcing bar cage with have
Along with the sand mold, the quick-setting cement mortar
A method of manufacturing a precast concrete member for wall construction , wherein concrete is poured onto the sand mold and hardened to form the other precast concrete plate after mixing the sand mold and compacting the sand mold. . Upon wherein at least one of the precast concrete plate forming, claims, characterized in that so as to dehydrate the excess water from the punching setting concrete
2. The method for producing a precast concrete member for wall construction according to 1 .