JPH0446442Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention generally relates to the curing of the tips of reinforcing bars during reinforced concrete construction, and in particular, the prevention of reinforcing bar connections that are left protruding until the next stage of concrete pouring. This is related to rust curing.

BACKGROUND OF THE INVENTION During concrete work, reinforcing reinforcing bars are exposed by extending their ends as connecting reinforcing bars for the next process during the concrete placing process. These reinforcing bars are often left in place, sometimes for quite long periods of time, and wall reinforcing bars, in particular, protrude upwards and become an obstruction in the workplace, causing direct injury or damage to clothing. This may cause problems in terms of safety management, especially in the case of a fall, which may result in personal injury. Therefore, special protective caps made of rubber or synthetic resin are commercially available as temporary equipment, and they are used to match the thickness of each type of reinforcing bar by attaching them to the cut end of each reinforcing bar. There is.

On the other hand, such reinforcing bar connections are vulnerable to rust, and especially in special construction works such as nuclear power related facilities, there is often a considerable period of time before the next stage of concrete pouring. Furthermore, due to the location of such facilities, when the construction site is close to the coast, the influence of so-called sea breeze cannot be ignored, and in such conditions, plastic bags are used as a simple means of rust prevention, and plastic bags are cut as appropriate. The bottom was made by closing one end of a vinyl tube and covering it with rebar to protect against rain and sea breezes.

Problems that the invention aims to solve Conventional protective caps are mainly used to prevent safety hazards, and are effective for protecting the tips of protruding reinforcing bars, but from the perspective of rust prevention, they are not suitable for general connections. It has no effect on length and is only useful for protecting the butt joint surface due to welding. In addition, when curing is covered with a plastic bag, the plastic bag is made of thin film material, so it often breaks, especially at the part where the reinforcing bars are cut, and it cannot withstand long-term use in areas exposed to strong winds, making it less effective. Not only is it lost, but the broken film tube often flutters and spoils its appearance. Although it is possible to use a thermoplastic film, it is not considered practical as it not only requires a separate heating process, but also requires time and effort to remove during concrete pouring, making it impossible to recover.

If a protective cap is attached to the tip of the reinforcing steel and a plastic bag is placed over it, the chances of the plastic bag breaking when exposed to wind will be reduced considerably, but plastic bags deteriorate due to weathering and become more likely to break. In the end, the goal cannot be achieved.

Means for Solving the Problems The present invention was developed with the aim of solving the above-mentioned problems regarding the protection of the protruding parts for connecting reinforcing bars. The main idea is to connect a protective cylinder to the open end side and cover the protrusion of the reinforcing bars as a whole to form a rust-preventing cap. The cap of this invention is made of a bellows-shaped anti-corrosive cylinder that is flexible and expands and contracts.Although the product is short, it can be stretched as required when installed, completely covering the reinforcing steel without leaving any exposed parts. It is characterized by a rust-proof cap configured to achieve the purpose of rust prevention.

Embodiment The rust-proofing cap of the present invention will be explained based on the drawings of the embodiment. In the figure, 1 is the entire cap for reinforcing steel rust prevention of the present invention, and the main body 2 of the cap is
and a protective cylinder 3. 4 indicates a reinforcing bar to which this cap 1 is attached. The main body 2 includes a cylindrical part 22 having an opening 21 into which the reinforcing bar 4 is inserted, and a tubular part 22 having an opening 21 into which the reinforcing bar 4 is inserted.
The cylindrical part 22 has an inner diameter matched to a predetermined reinforcing bar diameter so that when the reinforcing bar 4 is inserted, the tubular part 22 is attached to the distal end of the reinforcing bar 4 due to its elasticity. It is set as. The cap body part 23 is thicker than the cylindrical part 22, and the upper end surface in the figure is formed into a substantially spherical surface. has been formed.

Next, the protective cylindrical body 3 consists of a connecting part 31 at the upper end, a fixing part 32 at the lower end, and an intermediate part 33 connecting the intermediate parts, and the intermediate part 33 has a large number of bellows 34 continuously formed in a bellows shape. The entire body is made of soft rubber to form an elastic cylinder that can be expanded and contracted. The inner diameter of the connecting portion 31 is the same as that of the cylindrical portion 22 of the main body 2.
The outer diameter of the cylindrical portion 22 is smaller than or equal to the outer diameter of the cylindrical portion 22 . The fixing part 32 has a smaller diameter than the connecting part 31, and its inner diameter is approximately close to but larger than the outer diameter of the reinforcing bar 4, and is slidably inserted into the reinforcing bar 4.

This fixing part 32 has a width for tightening so that its lower end is fixed to the reinforcing bar 4 when the protective cylinder 3 is extended using a separate binding material 5 such as a rubber band or metal wire. The fixed part 32 also has an inner diameter smaller than the outer diameter of the reinforcing bar 4, and is slidable when the diameter is expanded by an external force. It is also possible to make it fixed.

The protective cylindrical body 3 can be a flexible cylindrical body without the bellows 34 in the intermediate part 33, and in particular, when the main body 2 and the protective cylindrical body 3 are manufactured separately, a soft synthetic resin should be used. I can do it.

Further, the main body 2 of the cap 1 and the protective cylinder 3 can be integrally molded so that the cylindrical part 22 of the main body 2 and the connecting part 31 of the protective cylinder 3 are continuous. In this case, it is preferable that the entire protective cylinder 3 is made of rubber or synthetic resin, and if it is made of rubber, the degree of vulcanization of both parts is changed to make the protective cylinder 3 softer.

Such a cap 1 is prepared and used in a size corresponding to the thickness of the target reinforcing bar.

Function The function of the cap 1 of the present invention will be explained based on its usage.

Concrete work is usually carried out on each floor separately.
Columns, beams, and walls are joined at the top of the slab, and the connecting reinforcing bars for the upper floors stand up from the top of the slab and protrude from the slab surface. Column reinforcements do not have joint positions aligned, and reinforcements are often made through several stories.
Although the working floor surface on the top of the slab rarely becomes an obstacle to traffic or transportation, the wall reinforcements are usually 9 mm or 13 mm, and they stand in parallel at a distance of 60 cm or less from the floor surface.

To attach the cap 1 to such a reinforcing bar 4, first the protective cylinder 3 is fitted onto the reinforcing bar 4, and then the main body 2 is placed over the top. Opening 21 of main body 2
When the tip of the reinforcing bar 4 is applied to and fitted into the cylindrical part 22, the cylindrical part 22 slightly expands in diameter to swallow the reinforcing bar 4, and is elastically attached. This body 2 is substantially equivalent to known safety caps for reinforcing bar cuts 41.

When the main body 2 is installed, the protective cylindrical body 3 that was previously fitted is lifted up, the diameter of the connecting part 31 is expanded elastically, and the connecting part 31 is fitted onto the outer periphery of the cylindrical part 22 of the main body 2, so that it is elastically fitted. , cap 1 is in the state shown in the left half of the figure.

Next, when the protective cylinder part 3 is extended downward and the fixing part 32 is lowered to the upper surface of the concrete surface 6, the entire cap 1 will be in the state shown in the right half of the figure with the middle part 33 being extended, so it will be fixed. A bonding material 5 is attached to the outer periphery of the portion 32.
For example, if a wire is wrapped around the cap and the lower end is fixed, the entire cap 1 will cover the reinforcing bar 4, shutting out rain and outside air, and becoming a rust-proof cap.

The main body 2 and the protective cylindrical body 3 can be combined and connected in advance and can be attached as an integrated cap 1. The same applies when the cap 1 is manufactured as a series. When the protective cylinder 3 has the fixing part 32 formed into a constricted shape due to its own elasticity, a fixing method that does not use the binding material 5 can also be used.

It is clear that the removal of cap 1 at the start of the next process of concrete work can be carried out by reversing the installation procedure, and cap 1 is diverted to the next process.
Used repeatedly. After this, main body 2 and protective cylinder 3
It is best to use them as a series of caps 1 without separating them from each other, especially to avoid losing the main body 2. Furthermore, the protective cylinder 3 is in a contracted state and has been reduced in weight.

Effects of the Invention Since the reinforcing steel rust prevention cap of the present invention is constructed and operates as described above, it can effectively achieve the purpose of rust preventing reinforcing bars that are exposed during construction. The cap of this invention has a protective cylindrical body that is expandable and retractable, so it is not only compact when contracted and convenient to store, but also able to cover the entire exposed part according to the length of the connecting reinforcing bar. It is possible to use it for other purposes, and it is more than effective in eliminating breakage and unfavorable appearance, and it is also effective in preventing salt damage to concrete.

Furthermore, this cap has a thick cap body and is used by fitting into the cut end of the reinforcing bars, so it has a safety function that not only protects the reinforcing bars but also serves as a protective cap to prevent hazards in the workplace. It can be done.

[Brief explanation of the drawing]

The drawings are cross-sectional views of the rust-preventing cap of the present invention when it is attached to reinforcing bars, and the left side with respect to the center line of the reinforcing bars is when it is initially installed, and the right side is when it is used. 1...Reinforcing steel rust prevention cap, 2...Main body, 3...
...Protective cylinder body, 4...Reinforcing bar, 5...Bondage material, 6...
Concrete surface, 21... Opening, 22... Cylindrical part, 23... Cap body part, 31... Connection part, 32...
Fixed part, 33... Middle part, 34... Bellows, 4
1...Cut.

Claims (1)

[Scope of utility model registration request] A cap-shaped body that is elastically attached to the tip of a reinforcing bar for connection in reinforced concrete construction by covering the cut, and a cap-shaped body that extends along the reinforcing bar with the opening for reinserting the reinforcing bar as the base end. A rust-proofing cap for reinforcing steel, characterized by consisting of a bellows-shaped, expandable protective cylinder.