JPH0718231B2 - Blocking plug loading method and loading jig in concrete construct - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for completely loading an obstruction plug used in the construction of a concrete structure, and a jig therefor.

(Conventional Technology and Problems) Concrete structures, particularly reinforcing bars, steel frames embedded in concrete structures, as concrete effective means for preventing salt damage,
The shortest distance between the surface of the steel such as PC steel and the concrete frame spacing rod and the surface of the concrete covering it has been increased, and the dense concrete has been placed to prevent sea salt particles from entering the concrete structure. .

On the other hand, in the conventional concrete structure that has been conventionally used, the cover thickness of the concrete formwork space maintaining rod is 10 to 20.
The length of the formwork support used because it is relatively small as a few millimeters, the repair to refill the hole of the trace that was removed is also simply apply adhesive to the tip of the closure plug made of mortar Then, insert and fix it to form a concrete surface.

However, by inserting and fixing the conventional obstruction plugs as described above, in the construction of a concrete structure with a large cover thickness to prevent salt damage, the holes in the marks left after removing the frame support Inserting and fixing the obstruction plug smoothly,
It has a defect that it cannot function completely after being inserted, that is, it has no effect.

Therefore, the present invention uses a long form supporting member for a concrete form spacing holding rod in a concrete structure having a relatively large cover thickness, supports the form, and forms the concrete after placing the concrete. The method of removing the formwork support tool that is the support member and simply and easily and completely loading the conical blocking plug formed to have the same depth as the depth of the hole and the loading jig are provided. is there.

(Means for Solving Problems) The present invention will be described based on Examples. As shown in FIG. 1, the structure of the present invention assembles a concrete formwork 2 when constructing a concrete structure 1. In this case, the distance from the screw end of the concrete formwork space holding rod 3 to the concrete formwork 2, that is, the fog thickness of the concrete formworking space holding rod 3 after the mold 2 is removed from the mold after the concrete has hardened. An effective method for protecting the concrete structure 1 from salt damage by enlarging the hole 5 formed by removing the concrete form supporting member 4 with a closing plug 10 and enlarging H is provided.

The concrete formwork support 4 used in the present invention has a conical shape as shown in FIG. 1, and the formwork space holding rod 3 and the formwork clamping rod 17 are screwed and connected at the center thereof. The core metal 8 is fitted into the embedding hole 9, and the length thereof is configured in consideration of the fog thickness H of the concrete structure 1.

Further, the mandrel 8 near the formwork 2 is inserted through the formwork 2 and screwed with a concrete formwork clamping rod 17 located outside,
The mold 2 is locked and fixed.

Then, after the concrete has been poured, the concrete formwork 2 is removed by the hardening thereof, and the conical formwork support 4 is removed from the concrete formwork space holding rod 3. It becomes something like.

In other words, the hole 5 corresponding to the fog thickness H of the concrete structure 1 has a concrete formwork space holding rod 3 at the tip thereof.
The tip portion 3a of the is protruding.

Next, the conical closure plug 10 to be inserted and loaded into the hole 5 after removing the conical concrete formwork support 4 has a shape as shown in FIG. It is made of mortar or synthetic resin, etc., the part facing the outside of the concrete wall is large, and the tip side is made into a cone-like shape, and the narrow tip end has a concrete form space holding rod. Hole 11 for accommodating the tip portion 3a of 3
Although the entire length is almost the same as that of the concrete formwork support 4, the diameter of the formwork support 4 is larger than the diameter of the adhesive in the same cross-sectional diameter. It is formed as a thin one.

As shown in FIG. 4, the conical obstruction plug 10 thus constructed is inserted and loaded into the hole 5 which has been left out of the concrete form supporting member 4, but first, 5
A jig 13 to be described below for uniformly applying the adhesive 12 to the inner peripheral wall 6 is immersed in the adhesive, and then the jig 13 is inserted into the hole 5 and lightly rotated 2-3 times. When moving and pulling out,
The adhesive 12 is evenly applied to the inner peripheral wall 6 of the hole 5 without any unevenness.

Immediately thereafter, the obstruction plug 10 is inserted into the hole 5, and the obstruction plug 10 is inserted.
The thick portion of the jig is fixedly pushed by the depressing and tapping section 16 of the jig 13 to load it into the hole 5.

Next, as shown in FIG. 5, the above-mentioned loading jig 13 is formed such that the length of the conical portion 14 at the tip is shorter than that of the conical closure plug 10 by about a fraction. In addition, it is connected to this cone-shaped part 14 and is a convenient grip part 15 for a thin rod-shaped grip, followed by a fixed push tapping part 16 at the rear end. The diameter of the portion 16 is formed to be slightly smaller than the diameter of the thick rear end portion of the conical closure plug 10.
When inserting the obstruction plug 10 into the hole 5, the push-and-load operation is not wasted.

When the jig 13 is immersed in the adhesive 12, the jig 13
The amount of adhesive adhered to the conical body portion 14 of the
This is the reason why the depth of the hole 5, that is, the length of the obstruction plug 10 is made shorter than the length of the obstruction plug 10 so that the overflow does not overflow further.

The loading jig 13 is preferably made of synthetic resin or wood, which is light and convenient for carrying, and is hard and prevents deformation and adhesion of the adhesive to the surface.

As described above, this jig is designed so that when the obstruction plug is inserted and loaded, the adhesive is applied to the inner peripheral wall surface of the hole in advance so that the concrete form supporting tool is removed. When the hole is deep and long, there is no possibility that air will be trapped between the deepest part of the hole and the tip of the plug, and the adhesive between the plug and the inner wall surface of the hole will not be uneven.

(Effect of the Invention) As described above, according to the present invention, in the construction of a concrete structure having a large fog thickness, the insertion and loading of the block plugs of the holes after the removal of the concrete form supporting member are required.
Even if the obstruction plug is as long as double to 3 or 4 times, it is easy to insert and load it in the correct position, or it is easy and quick to treat the hole after removing the concrete formwork support regardless of the skill of the operator. It is a method of loading an obstruction plug that enables the above.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a concrete structure construction with auxiliary equipment such as formwork at the time of placing concrete. FIG. 2 is a side sectional view of a hole left after removing the concrete formwork support tool. FIG. 3 is a side sectional view in which a conical obstruction plug is partially cut. FIG. 4 is a side cross-sectional view in which a blocking plug is inserted and loaded by the method of the present invention and is partially cut. FIG. 5 is an explanatory view of the plug stopper loading jig used in the present invention. 1 ... Concrete structure, 2 ... Concrete formwork,
3 ... concrete formwork space holding rod, 3a ... the tip of the concrete formwork space holding rod 3, 4 ... concrete formwork support, 5 ... hole, 6 ... hole inner wall surface, 8 ... mandrel,
9 ... Embedding hole, 10 ... Blocking plug, 11 ... Hole, 12 ... Adhesive, 13 ... Loading jig, 14 ... Jig conical part, 15 ...
Grip part, 16 …… Pressing and tapping part, 17 …… Concrete form clamping rod, H …… Fog thickness.

Claims (2)

[Claims] 1. In the construction of a concrete structure having a large fog thickness, a plug for inserting and fixing into a hole of a form supporting member removal mark located between a concrete form spacing rod and a concrete form clamping rod, A method for loading a closure plug, characterized in that an adhesive is previously applied to a jig of the same size as the closure plug, the adhesive is applied to the inner peripheral surface of the hole, and then the closure plug is inserted and fixed. 2. A closure plug loading jig for a concrete structure, wherein a conical body is provided at the tip, a handshake is provided in the middle, and a depressing and hitting section is provided at the rear end.