JP3057850U - Plug - Google Patents

Abstract

(57) [Summary] [Object] To provide a plug that fits into a mortar inlet of a steel pipe sleeve joint in which a mortar inlet cannot be provided with a calling port unlike a sleeve joint manufactured by casting.
It is easy to fit and the outflow stops naturally without taking mortar outflow preventive measures after mortar injection. [Structure] An integral body made of rubber and having a cylindrical main body 2,
It comprises a locking portion 3 attached to both ends of the main body and a partition 4 provided on the inner wall of the main body, and a through hole 5 having a diameter substantially equal to the maximum size of the fine aggregate of mortar is provided at the center of the partition 4. ing.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 The present invention relates to a plug to be fitted into a mortar inlet such as a steel pipe sleeve joint, in which the injection operation from a mortar injector is simple and measures are taken to prevent mortar outflow into the inlet after the injection is completed. It has the feature that the application step can be omitted.

[0002]

[Background Art]

 A sleeve joint is known as a rebar joint. As shown in FIG. 2 (b), this product 10 is formed of an elongated hollow cylindrical body, into which a pair of reinforcing bars are loosely inserted in the opposite direction, and the space between the reinforcing bar and the inner wall of the joint is filled with mortar. This is a joint type rebar joint in which a pair of rebars is fixed by hardening to form a joint. A mortar inlet 11 is provided at one end, and a mortar outlet 12 is provided at the other end. In addition, many annular projections 13 are provided on the inner wall to increase the engaging force between the hardened mortar and the joint to increase the joining strength.

[0003] The inlet 11 is provided with a call-out port protruding in the direction perpendicular to the long axis of the joint. One end of a rubber hose is fitted to the outside during mortar injection, and the tip of a mortar injector is inserted into the other end. And inject mortar. When the injection is completed, take out the tip of the cylinder, bend the rubber hose, and tie it with a wire to prevent the mortar from flowing out.

[0004] As described above, the sleeve joint has to be manufactured by casting because of the provision of the annular projection on the inner wall and the calling port on the outer wall, which has been expensive.

[0005] In order to improve the cost, a steel pipe sleeve (exemplified in FIG. 3A) made by cutting a normal steel pipe to a predetermined length has been proposed. In this case 6, a steel pipe is pressed at regular intervals in place of the annular projection to form an internal projection 9. The inlet 7 and the outlet 8 are formed by perforating a steel pipe wall. The above callout is not formed because it is not made by casting. Therefore, it is not possible to employ a simple means such as a connection between the injection port and the syringe barrel tip using a rubber hose such as the above-mentioned cast sleeve joint and a measure to prevent mortar outflow by bending the rubber hose.

The present invention has been provided to solve the problem of mortar injection work in such a steel pipe sleeve joint and the like. This will be described in detail below.

The plug of the present invention is a plug that fits into a mortar injection port of a rebar joint of a type in which a reinforcing bar loosely inserted into a hollow cylinder is fixed by curing mortar filled in the cylinder. And (a) a cylindrical main body, a locking portion attached to both ends of the main body and extending annularly in a direction perpendicular to the cylindrical axis of the main body. (B) the distance between the inner edges of the locking portion is substantially equal to the depth of the joint inlet; and (c) the central portion of the partition. A plug having a structure in which a through hole having a diameter substantially equal to the maximum size of fine aggregate of mortar to be injected into a joint is provided.

Hereinafter, the present invention will be described with reference to FIG. 1, which illustrates a plug according to the present invention. In the figure, a plug 1 comprises a main body 2, a locking portion 3 and a partition 4. The main body 2 has a cylindrical shape and its outer diameter is large enough to fit into a mortar inlet (diameter: about 10 to 20 mm) of a steel pipe sleeve joint.

The locking portion 3 is provided so that when the plug is fitted to the joint inlet, the plug does not move and is fixed to the inlet. For this purpose, the distance between the inner edges is set. H is almost equal to the depth of the inlet (usually equal to the thickness of the joint side wall), the overhang length D from the outer wall of the main body is about 2 mm, and the outer edge of the outer edge has a corner so that it can be easily pushed into the inlet. It has a smooth shape.

The thickness of the partition 4 is selected to be about 1 mm, which is smaller than the thickness of the main body. The reasons are as follows. When pouring the mortar, press the tip of the mortar injector into the through-hole, expand it, insert the tip into the inlet, and inject the mortar into the joint. When the injection is completed, the tip of the cylinder is pulled out. At this time, the through hole once expanded returns to its original diameter. The mortar flows out of the through-hole, but the diameter of the through-hole is almost equal to the maximum size of the fine aggregate of the mortar (usually 2-3 mm). The plugging spill naturally stops. In this way, the diameter of the through-hole was selected to be about the maximum size of the fine aggregate so that the outflow could be naturally prevented without special outflow prevention measures after the injection. Then, the wall thickness of the partition wall is reduced in order to reduce the resistance of the opening of the through hole.

The position of the partition 4 may be at the end or the middle of the main body. However, when the plug is fitted so that the partition comes to the inner opening of the inlet at the end, the partition 4 is inserted into the joint. The distance between the reinforcing bar and the through-hole is too short, and there is a disadvantage that the insertion depth of the syringe barrel tip cannot be sufficiently obtained. For this reason, when the partition is at the end, care must be taken in the fitting direction of the plug so that it comes to the outside opening of the inlet. In order to avoid this trouble, it is preferable that the partition is provided so as to be located substantially at the center of the main body in the cylindrical axis direction. Then, the fitting direction does not need to be considered at the time of fitting.

[0012] As the steel pipe sleeve joint, a joint in which a pair of rebars are both fixed to the joint by hardening of mortar is shown above, but only one of the pair of rebars is set by mortar hardening and the other is another fixing method. For example, there are composite joints that are fixed by, for example, screwing, pressing, welding, or the like. In the case of this joint, a portion for performing mortar hardening and fixing, that is, a sleeve portion is a cylindrical body into which a reinforcing bar can be loosely inserted, and an inlet and an outlet are provided at both ends thereof. The plug of the present invention can also be used for the injection port of this sleeve portion. Further, it can be used as an inlet of a sleeve joint and a sleeve joint of the above-mentioned composite type (both are made of casting), so that the connection by the rubber hose can be omitted.

[0013]

[Effect of the Invention] The plug body of the present invention is a mortar injection by a rubber hose like a sleeve joint made of cast steel. A mortar injection from the injection inlet of the steel pipe sleeve which is not provided with a calling port that can connect the cylinder tip and the injection port of the joint. Can be easily performed, and the outflow can be prevented without taking special measures to prevent mortar outflow after the end of the injection. This has solved the difficulties in mortar injection work for steel pipe sleeve joints, which are inexpensive joints. Moreover, since the plug is simple in structure, the production cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing the plug of the present invention.

FIGS. 2A and 2B are longitudinal sectional views illustrating a rebar joint; FIG. 2A is a steel tube sleeve joint; FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plug body of this invention 2 Main part 3 Locking part 4 Partition part 5 Through-hole 6 Steel pipe sleeve joint 7 Injection port same as above 8 Discharge port same as above 9 Internal protrusion 10 Sleeve joint 11 Same as above inlet 12 Same as above discharge port 13 Annular protrusion

Claims (1)

[Utility model registration claims] 1. A plug which fits into a mortar injection port of a rebar joint of a system in which a reinforcing bar loosely inserted into a hollow cylindrical body is fixed by hardening of a mortar filled in the hollow cylindrical body. (A) a cylindrical main body, a locking portion attached to both ends of the main body and extending annularly in a direction perpendicular to the cylindrical axis of the main body, and a cylindrical shaft on the inner wall of the main body. (B) a mortar in which the distance between the inner edges of the locking portion is substantially equal to the depth of the joint inlet; Characterized in that a through hole having a diameter substantially equal to the maximum dimension of the fine aggregate is provided.