JPH038866Y2 - - Google Patents

Description

[Detailed explanation of the invention] (1) Industrial application field This invention is a pipe joint for propulsion concrete pipes, more specifically, it connects two propulsion concrete pipes each having an annular step formed on the outer periphery of the opposing ends. This relates to pipe fittings.

(2) Problems to be solved by conventional technology and ideas As this type of pipe joint, the ends of the propulsion concrete pipes to be connected, including the annular step, are reinforced with reinforcing members to repeatedly transmit thrust. There is a method that prevents the end portion from being damaged due to the pressing force based on. However, since the conventional reinforcing members described above are not firmly fixed to the end of the concrete pipe by burying or the like, when the end of the concrete pipe receives strong pressing force during propulsion, the fixation loosens. Due to the loosening of this reinforcing member, there was a problem in that it was not possible to completely maintain water-stopping properties, and the durability was also lacking. In addition, with conventional reinforcing members, such as those consisting of an annular reinforcing plate covering the end surface of a concrete pipe and a reinforcing cylindrical body covering the outer peripheral surface, in the case of bending propulsion or meandering propulsion, local reinforcing members may be locally attached to the end surface of the concrete pipe. Because the concentrated pressing force is directly applied (it is said that this pressing force is propagated from the point of application through the reinforcing plate and into the end of the concrete pipe with a spread of 90°), the pressing force is localized. If it becomes too large, there is a problem in that cracks and damage tend to occur in the inner part of the concrete pipe other than the outer part restrained by the reinforcing cylindrical body at the end of the pipe.

Therefore, with this invention, a part of the reinforcing member can be embedded in the end of the concrete pipe to firmly fix it, and even if pressing force is locally concentrated on the end face of the concrete pipe, the reinforcing member can be firmly fixed at the end of the concrete pipe. The technical problem is to reduce the pressing force transmitted to the parts.

(3) Means for solving the problems In order to solve the above-mentioned problems, the pipe joint of this invention is characterized by adopting the following technical measures. That is, as shown in FIGS. 1 and 2, the annular reinforcing plates 6 and 6a are formed so that the end portions and the inner diameter are approximately equal and the outer diameter is slightly larger than the annular step portions 3 and 3a, and the end portions and the outer diameter are approximately the same. Annular reinforcing plates 7, 7a that are equal in diameter and have an inner diameter slightly larger than the ends and are arranged parallel to the reinforcing plates 6, 6a at a desired interval, and near the outer peripheral ends of the reinforcing plates 6, 6a. Reinforcing cylinders 10, 10a fixed between both reinforcing plates 6, 7, 6a, 7a, and a reinforcing cylinder concentrically with the reinforcing cylinders 10, 10a near the outer peripheral ends of the reinforcing plates 7, 7a on the opposite side of the reinforcing cylinders. a reinforcing member 5 comprising reinforcing cylindrical bodies 12, 12a fixed in a shape;
5a, one of the reinforcing members 5 is at the end of one concrete pipe 1, and the other reinforcing member 5a is at the opposite end of the other concrete pipe 1a, and reinforcing plates 6, 6a are annular. The reinforcing cylindrical bodies 10, 10a cover almost the entire end surfaces of the stepped parts 3, 3a, and the reinforcing cylindrical bodies 12, 12a connect with the annular stepped parts 3, 3a. The reinforcing plates 7, 7a are buried and fixed near the joints between the annular steps 3, 3a and the ends, and the outer periphery between the annular steps 3, 3a of both concrete pipes 1, 1a is covered with reinforcing plates 7, 7a. The steel collar 14 is attached to the web 15
is inserted between the reinforcing plates 6, 6a, and the reinforcing cylindrical bodies 10, 1 of the collar and both reinforcing members 5, 5a
The watertight rubber rings 16, 16a are installed between the 0a and 0a.

(4) Effect With the above configuration, even if the end face of the concrete pipe receives strong pressing force during propulsion, the reinforcing plates 7, 7a extend into the end of the concrete pipe 1, 1a to near the inner diameter of the end, and are buried and fixed. Therefore, the reinforcing members 5, 5a will not loosen. In addition, when the pressing force acts locally concentrated on the end face of the concrete pipe,
The pressing force is applied to the reinforcing members 5, 5 through the reinforcing plates 6, 6a.
The reinforcement plates 6, 6a, the reinforcing cylindrical bodies 10, 10a, and the buried and fixed reinforcing plates 7, 7a are received by the concrete in the section a, but part of the pressing force is applied to the reinforcing plates 6, 6a, the reinforcing cylindrical bodies 10, 10a, and the reinforced plates 7, 7a. 10, 10a and reinforcing plates 7, 7a, and the concrete behind the reinforcing members 7, 7a is also received through the reinforcing members 5, 5a, which have a U-shaped cross section. The pressing force transmitted to the concrete in the sectioned area is significantly reduced.

(5) Effects of the invention In this invention, since the reinforcing member is firmly fixed without loosening as described above, complete water-tightness and durability can be maintained over a long period of time. In addition, the pressing force acting locally concentrated on the end face of the concrete pipe is applied not only to the concrete in the area partitioned by both reinforcing plates and the reinforcing cylinder, but also to a part of the concrete behind the reinforcing plate buried at the end. As a result, the pressing force transmitted to the concrete in the partitioned portion is significantly reduced, so the pressing force resistance of the end portion is greatly increased compared to the conventional one, and the end portion of the concrete pipe, especially It can prevent cracks and damage from occurring in the inner part, and can withstand the increased propulsion force over long distances. Furthermore, by using the reinforcing member as described above,
Almost the entire end surface of the annular step formed on the outer periphery of the end of the concrete pipe is reinforced with a reinforcing plate, the outer circumferential surface of the annular step is reinforced with a cylindrical body, and the outer circumferential surface of the end connected to the annular step is further reinforced with another reinforcement. Since each is covered with a cylindrical body, it is possible to effectively prevent the end portion of the concrete pipe including the annular step portion from being damaged during propulsion. Furthermore, since the reinforcing member consists of an extremely simple shape of an annular plate and a cylindrical body,
It is easy to manufacture and can also be easily embedded and fixed at the end of a concrete pipe.

(6) Example In Figures 1 and 2, 1 and 1a are concrete propulsion pipes. The concrete pipe 1 has an annular step 3 formed on the outer periphery of the end of a concrete pipe main body 2, and an iron reinforcing member 5 is provided at the end including the annular step 3. The reinforcing member 5 includes an annular reinforcing plate 6 having an inner diameter equal to that of the tube body 2 and an outer diameter slightly larger than the annular step portion 3;
and the inner diameter is formed larger than that, so that the reinforcing plate 6
an annular reinforcing plate 7 arranged in parallel with a desired spacing, and a protrusion 8 for holding a watertight rubber ring on the outer circumferential surface, which is fixed between the reinforcing plates 6 and 7 near the outer peripheral end of the reinforcing plate 6. A reinforcing cylindrical body 10 and a reinforcing plate 7
It consists of a reinforcing cylindrical body 12 which has the same outer diameter as the tube main body 2 at the outer circumferential end and which extends concentrically with the cylindrical body 10 and is fixed to the central part side of the tube main body 2, and the reinforcing plate 6 has an annular shape. The cylindrical body 10 covers the end surface of the stepped portion 3 and the outer peripheral surface of the stepped portion 3, and the reinforcing plate 7 is embedded and fixed within the end portion.

The concrete pipe 1a has the same structure as the concrete pipe 1. Therefore, the detailed description of the concrete pipe 1a will be replaced by the description of the concrete pipe 1, and the same parts will be given the same reference numerals and the letter a.

A steel collar 14 is provided on the outer periphery between the annular step portions 3 and 3a at opposite ends of both the concrete pipes 1 and 1a, and a web 15 provided at the center of the inner peripheral surface of the collar 14 is attached to the reinforcing members 5 and 5a. It is inserted between the reinforcing plates 6 and 6a. Watertight rubber rings 16, 16a are mounted between the steel collar 14 and the cylindrical bodies 10, 10a of the reinforcing members 5, 5a, and are held in position by the upper edges of the reinforcing plates 6, 6a and the protrusions 8, 8a. ing.

In the above, the reinforcing plates 7, 7 of the reinforcing members 5, 5a
Anchors or axial reinforcing bars may be welded to a and embedded in the tube bodies 2, 2a by centrifugal molding, thereby making it possible to more firmly integrate the reinforcing members 5, 5a and the tube bodies 2, 2a.

Next, the operation of the above embodiment will be explained.

In the pipe joint as described above, the reinforcing members 5, 5a provided for reinforcing the ends of the concrete pipes 1, 1a have reinforcing plates 6, 6a connected to the annular stepped portion 3,
Covering the end face of 3a and reinforcing cylindrical body 10, 10a
and 12, 12a are fixed to cover the outer peripheral surfaces of the annular step portions 3, 3a and the outer peripheral surfaces of the end portions, and the reinforcing plates 7, 7a are embedded within the end portions and are firmly fixed, so that the propulsion Even if the end face of a concrete pipe is sometimes subjected to strong pressing force, the fixation rarely loosens. Therefore, since the reinforcing cylindrical bodies 10, 10a of the reinforcing members 5, 5a and the rubber rings 16, 16a disposed inside the collar 14 are not adversely affected after the joint is completed, the rubber rings 16, 16
With a, water can be completely stopped and durability can be significantly improved.

In addition, in the concrete pipes 1, 1a of the above embodiment, both reinforcing plates 6, 7 and 6 of the reinforcing members 5, 5a
During centrifugal forming, the parts A and Aa separated by the reinforcing cylinders 10 and 10a are filled with concrete of the same quality as the concrete pipe bodies 2 and 2a, but instead of this, the parts A and Aa are filled with concrete of the same quality as the concrete pipe bodies 2 and 2a. In either case, an expandable admixture (manufactured by Denki Kagaku Kogyo Co., Ltd. or Nippon Cement Co., Ltd.), a high-strength admixture (Σ1000 made by Denki Kagaku Kogyo Co., Ltd.), or an admixture that is a mixture of these two types of admixtures is used. Concrete mixed with an admixture amount of 5 to 20% by weight based on the amount of cement may be filled, and the parts A and Aa may be filled with sand, sand, etc. in synthetic resin such as epoxy resin or polyester resin. It may be filled with resin mortar or resin concrete mixed with aggregate such as gravel. When such concrete is filled into the portions A and Aa, it becomes possible to further strengthen the pressure resistance within the portions A and Aa. Further, in the embodiment described above, the reinforcing members 5, 5a are made of iron, but it goes without saying that they may be made of other materials such as hard synthetic resin or fiber-reinforced plastic.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view showing an embodiment of this invention, and FIG. 2 is a longitudinal sectional side view taken along the line shown in FIG. 1. 1, 1a... Concrete pipe for propulsion, 2, 2a
... Concrete pipe body, 3, 3a ... Annular step, 5, 5a ... Reinforcement member, 6, 6a, 7, 7a
...Annular reinforcing plate, 8, 8a...Protrusion, 10, 10
a, 12, 12a...Reinforcement cylindrical body, 14...Steel collar, 16, 16a...Watertight rubber ring.

Claims (1)

[Scope of Claim for Utility Model Registration] A pipe joint that connects two propulsion concrete pipes each having an annular stepped portion formed on the outer periphery of opposing ends by a steel collar having a web approximately in the center of the inner peripheral surface. , annular reinforcing plates 6, 6a having an inner diameter approximately equal to that of the end portion and having an outer diameter slightly larger than the annular stepped portions 3, 3a; Annular reinforcing plates 7, 7a are formed slightly larger than the reinforcing plates 6, 6a and are arranged in parallel with the reinforcing plates 6, 6a at desired intervals, and both reinforcing plates 6, 7, 6a are arranged near the outer peripheral ends of the reinforcing plates 6, 6a. , 7a, and a reinforcing cylinder 10, 10a and a reinforcing member fixed in a circular manner near the outer peripheral end of the reinforcing plates 7, 7a on the opposite side of the reinforcing cylinders. It has a pair of reinforcing members 5, 5a having cylindrical bodies 12, 12a, one of these reinforcing members 5 is attached to the end of one concrete pipe 1, and the other reinforcing member 5a is attached to the end of the other concrete pipe 1a. Reinforcement plates 6, 6a are provided at opposite ends of the annular step portions 3, 3, respectively.
The reinforcing cylindrical bodies 10, 10a cover almost the entire end surface of a.
covers the outer circumferential surfaces of the annular step portions 3, 3a, the reinforcing cylinders 12, 12a cover the outer circumferential surfaces of the ends connecting with the annular step portions 3, 3a, and the reinforcing plates 7, 7a cover the outer circumferential surfaces of the annular step portions 3, 3a. A steel collar 14 is embedded and fixed near the joint between the concrete pipe 3a and the end, and a steel collar 14 is installed on the outer periphery between the annular step parts 3 and 3a of both concrete pipes 1 and 1a, and a web 15 is interposed between the reinforcing plates 6 and 6a. The reinforcing cylindrical body 1 of this collar and both reinforcing members 5, 5a is fitted and inserted.
A pipe joint for a propulsion concrete pipe, characterized in that watertight rubber rings 16, 16a are installed between the pipes 0 and 10a.