JPH0414692Y2 - - Google Patents

Description

[Detailed description of the invention] "Field of industrial application" The present invention generally relates to reinforced concrete pipes, and more specifically, to reinforced concrete pipes, in particular, to an outer pipe coated with a corrosion-resistant resin that can improve the corrosion resistance of the outer surface. This invention relates to a composite reinforced concrete pipe, a part of which is constructed as a high-strength joint.

``Prior Art'' As is well known, this type of reinforced concrete pipe is classified into A-type pipes, B-type pipes, C-type pipes, propulsion pipes, etc.
As shown in FIG. 1, the reinforced concrete pipes are made of pipe bodies 10 with a uniform diameter, and in order to connect these reinforced concrete pipes, the end surfaces of the pipe bodies 10 are butted against each other, and the joint member is made of a material whose outer diameter is smaller than the outer diameter of the pipe bodies 10. Ring body 1 made of concrete or iron and having a suitably large inner diameter
1 is used, and a mortar composition 12 is applied to the gap between the pipe body 10 and the ring body 11 as a water stopping means. On the other hand, as shown in FIG. 2, the B-shaped pipe has a bulging and integrally formed annular joint part 14 at one end of the pipe main body 13, and the other end of the pipe is inserted into this annular joint part 14. A rubber gasket 15 is fitted to this connected portion to constitute a water stop means. The C-shaped pipe is generally adopted as a large-diameter pipe, and does not have an overhang such as the ring body 11 or the annular joint part 14 like the A-shaped pipe and the B-shaped pipe, and as shown in FIG. It has a spigot type structure in which a fitting recess 17 is formed at one end of the pipe body 16 and a protrusion 18 that fits into the recess 17 at the other end. A rubber gasket 15 is used in the same way as the tube.

The propulsion tube has a joint section 20 formed at both ends of the tube body 19, a rubber gasket 15 is fitted into each section, and the tube bodies 19 are sequentially connected to each other with a separate steel collar 21, as shown in FIG. In addition to the structure, as shown in FIG.
and the other pipe end 23 via the rubber gasket 15.
A structure that allows insertion and connection is also adopted.

In addition, in the above A-shaped pipe, the ring body 11 is connected to the pipe body 10.
There is also known a structure in which a rubber gasket is used as a water-stopping means by bonding the end of the pipe with an appropriate adhesive or the like.

``Problem that the invention aims to solve'' The water-stopping performance of the joints of reinforced concrete pipes with the above structure was found to be sufficient to withstand internal or external water pressure of 1 to 2 kg/cm ² in joint water pressure experiments in factories, etc. However, when the pipe is buried in soft ground such as a reclaimed land, underground water etc. often infiltrate into the pipe due to the phenomenon of the pipe being pulled out at the joint due to uneven settlement of the pipe, which is currently causing problems. This has become a major social problem, and there is a strong demand for the development of a joint structure that can cope with such uneven settlement.

In addition, conventional reinforced concrete pipes such as those mentioned above are not acid resistant and are therefore vulnerable to acidic soil or acidic groundwater, and when used in such locations, the outer or inner surface of the pipe gradually erodes. There have also been cases where this has led to destruction. In particular, A
In addition to the above-mentioned acid corrosion problem, shaped pipes in which the ring body 11 is made of steel and propulsion pipes with a joint structure consisting of steel collars 21 and 25 are susceptible to local corrosion or so-called stray current-induced corrosion. Due to the addition of electrolytic corrosion,
There are many cases in which small holes appear in the rings less than 10 years after they are buried, and groundwater etc. can enter the pipes through these holes.

``Means for Solving the Problems'' In view of the above, the present invention forms an overcoated tube made of a corrosion-resistant resin containing reinforcing glass fibers in close contact with the outer surface of a reinforced concrete pipe, and the end portion of the overcoated tube is The present invention provides a composite reinforced concrete pipe configured to extend integrally and form a joint portion at the same time. Such a joint part is optimally configured to increase the mixing ratio of reinforcing glass fiber to the corrosion-resistant resin so that the mechanical strength such as tensile and bending is sufficiently ensured compared to other parts. A composite reinforced concrete pipe having an outer jacket pipe with an integrally formed joint part is
In addition to having good acid resistance and electrolytic corrosion resistance, it also has a high-strength joint structure itself, so it is possible to obtain a reinforced concrete pipe with an extremely simple structure.

The above-mentioned corrosion-resistant resin can be used to form composite reinforced concrete pipes that can strengthen properties such as acid resistance and electrolytic corrosion resistance on the inner surface of the pipe by forming the resin in close contact with the inner surface of the reinforced concrete pipe to form a covered inner pipe. can also be provided.

``Example'' Fig. 1 shows a conceptual partial cross-sectional configuration diagram of a composite reinforced concrete pipe constructed according to the present invention. Form a fitting opening part 2 with an appropriate length, and cut 3 to 5 grooves 3 on the outer periphery of the fitting part 2 at a suitable location, such as 20 to 50 mm from the end surface of the fitting part 2.
The groove is carved to a depth of about mm, and a rubber gasket 7 as a water-stopping means can be appropriately attached as described later. The outer surface of the reinforced concrete pipe body 1 is provided with an overcoated pipe 5 having a joint part 6 integrally formed around the entire circumference except for the joint insertion part 2 and a joint part 6 extending and protruding from the pipe end 4 according to the present invention. The pipes are formed thin and in close contact, thus forming a composite reinforced concrete pipe that also has a joint structure. The sheathed outer tube 5 having the joint portion 6 is made of a corrosion-resistant resin, and a reinforcing member such as reinforcing glass fiber is suitably mixed into the corrosion-resistant resin. For example, such an overcoated pipe 5 is manufactured in advance to have the same length as the reinforced concrete pipe main body 1, and is offset from the joint insertion part 2 of the reinforced concrete pipe main body 1 and placed closely on the outer periphery of the joint, thereby making it possible to connect the joint. A joint portion 6 having a length corresponding to the spout portion 2 can be immediately formed to protrude from the tube end 4. The protruding length of the joint portion 6 can be arbitrarily determined depending on the diameter of the reinforced concrete pipe and other structures, and can be set to about 10 cm, for example. In addition, the thickness of the corrosion-resistant resin-coated outer pipe 5 including such a joint portion 6 should of course be configured to a required thickness by taking into consideration the diameter of the reinforced concrete pipe body 1, etc., but except in special cases. As a general value, for example, about 4 to 10 mm can be adopted. The outer diameter of the joint spigot 2 can be made smaller, for example, by about 3 to 5 mm than the outer diameter of the tube body 1, and thus the inner diameter of the joint portion 6.

The composite reinforced concrete pipe having the above-mentioned structure and joint function can be manufactured on a mass production scale at a practically adequate cost, and
To connect these by burying them, as shown in Figure 2, while appropriately interposing a water-stopping means such as a rubber gasket 7 in the joint part 6 of one composite reinforced concrete pipe, the joint opening part 2 of the other composite reinforced concrete pipe is watertight. By inserting the tube into the tube and repeating the same connection operation sequentially, it is possible to construct a pipeline of a length according to the specifications with high efficiency. Therefore, such a conduit has a structure in which substantially the entire circumference of the conduit is suitably covered by each outer pipe 5 including the joint portion 6,
This makes it possible to easily achieve a comprehensive corrosion-resistant structure for the entire pipe line, which has suitable acid-resistant functions and electrolytic corrosion-resistant functions.

FIG. 3 shows a cross-sectional configuration diagram of the main parts of the composite reinforced concrete pipe described above, which is constructed so as to suitably ensure the mechanical strength of the joints, in particular,
As shown in part B of the same figure, the joint portion 6A, which includes the part that extends about 20 to 30 cm from the pipe end 4, has a high mixing amount of reinforcing glass fiber as a reinforcing member to the corrosion-resistant resin, to about 20 to 50 parts. It is composed of
The amount of reinforcing glass fiber mixed in the other coated outer tube 5 shown in part A is about 0 to 20 parts, with emphasis placed on corrosion resistance, similar to the composite reinforced concrete tube. Since the joint portion 6A has such a reinforced structure, the joint portion 6A has sufficient strength to cope with the bending or tensile action that is applied to the joint portion 6A due to uneven settlement after the connecting pipe is laid.

In addition to the above-mentioned means for appropriately increasing the amount of reinforcing glass fiber mixed in as a mechanically reinforcing structure for the joint portion 6 or 6A, although not shown in the drawings, Joint part 6 shown by
It is also possible to adopt a structure in which a separate ring body made of a corrosion-resistant metal or a metal member subjected to corrosion-resistant treatment is closely attached to the inner or outer circumference of the 6A,
Furthermore, the part corresponding to the joint shown in part B above is formed separately in such a manner that it can be joined to the outer pipe 5, and its composition, mechanical strength, etc., are determined based on the overall factors of the buried pipe system. It is also possible to design and manufacture several types of pipes in advance so as to be able to accommodate arbitrary optimization, and to selectively combine them to construct a composite reinforced concrete pipe that is optimal for a pipeline system. In the case of constructing a portion corresponding to a separate type joint, of course, a composite structure having a ring body as described above may be adopted, and the entire circumference of the connected buried pipe has substantially good corrosion resistance, In addition, various embodiments including a high-strength joint structure can be adopted.

The composite reinforced concrete pipe structure described above can provide sufficient performance in terms of corrosion resistance on the outside surface of the pipe and mechanical strength of the joint part, but it is possible to provide sufficient performance in terms of corrosion resistance on the outside surface of the pipe and mechanical strength of the joint part. In the case of a product that requires corrosion resistance, a corrosion-resistant coated inner tube 9 having the same structure as described above is formed in close contact with the inner surface 8 of the tube including both tube ends, as shown in FIG. 41. In addition, as shown in Figure 2, by forming such a coating layer on the joint opening 2 as necessary, it is also possible to manufacture a pipe with a corrosion-resistant structure on the entire inner and outer surfaces. It is.

In the embodiment described above, there is an example in which reinforcing glass fiber is used as a means for mixing reinforcing material into the outer sheathed tube 5 made of corrosion-resistant resin, the joint portion 6 or 6A, the inner sheathed tube 9 to be provided on the inner surface of the tube, etc. However, as the reinforcing material to be mixed into the corrosion-resistant resin, members similar to or having the same effect as such reinforcing glass fibers and other appropriate materials may also be used.

"Effects of the Invention" As explained above, the composite reinforced concrete pipe according to the present invention includes an outer pipe made of a corrosion-resistant resin containing reinforcing glass fibers that is closely formed on the outer surface of the reinforced concrete pipe, and the outer pipe is made of the reinforced concrete pipe. It has a joint part protruding from one end of the pipe to connect the reinforced concrete pipes to each other, and the joint part is constructed to have high strength by having a higher mixing ratio of the reinforcing glass fiber to the corrosion-resistant resin than other parts, and the joint part has a high strength. The other end of the reinforced concrete pipe is integrally formed with a joint opening for watertight insertion into the joint of another composite reinforced concrete pipe. Since it is also possible to provide a sheathed inner tube made of a corrosion-resistant resin that is formed in close contact with the inner surface, at least the following effects can be achieved.

Since it can be constructed in a simple shape with a uniform diameter, it does not have a bulging part corresponding to a joint, such as in conventional A-type or B-type pipes, so there is no need to excavate for it when burying it. Moreover, the excavation width can be made narrower accordingly, contributing to higher efficiency and lower cost of underground construction.

Particularly on the outer surface of the reinforced concrete pipe body, an outer tube made of corrosion-resistant resin containing reinforcing glass fiber is integrally formed to ensure good corrosion resistance functions such as acid resistance and electrolytic corrosion resistance, and the same can be applied to the inner surface of the tube as appropriate. By providing a corrosion-resistant structure, it is possible to provide a composite reinforced concrete pipe that can be suitably used for pipelines containing acidic water and the like.

Since the joint part constructed according to the present invention can have sufficient strength and length,
Prevents stress fractures caused by uneven settlement, etc., and
Even if the amount by which the pipes slip out from each other is considerably large, intrusion of groundwater, etc. can be suitably prevented.

Conventional joint structures for reinforced concrete pipes rely on the consolidation elasticity of rubber gaskets, etc. for water-stopping properties, so there is a risk of the pipe slipping out and severely impairing the consolidation or bonding properties of the joint structure. It has been difficult to resolve the trade-offs between water-stopping properties and bonding properties. On the other hand, according to the structure of the high-strength joint part adopted in this invention, unlike the conventional joint structure as described above,
Since the joint structure itself has appropriate elasticity, the synergistic effect of this elasticity and the consolidation elasticity of the water-stopping means such as rubber gaskets creates an excellent joint structure that can achieve both water-stopping properties and bondability. can be equipped with.

Therefore, by employing the composite reinforced concrete pipe of the present invention, it is possible to optimally configure a buried pipe system with sufficient durability for the ground structure to be buried and the properties of flowing water within the pipe.

[Brief explanation of the drawing]

FIG. 1 is a conceptual partial cross-sectional configuration diagram of a composite reinforced concrete pipe according to the present invention, and FIG.
Figure 3 is an explanatory diagram conceptually showing an example of connecting the composite reinforced concrete pipes shown in the figure to construct a buried pipeline of the required length. Figures 4 1 and 2, which are cross-sectional diagrams of the main parts of a composite reinforced concrete pipe that is suitably configured to heighten the height, show that the structure of the present invention provides a corrosion-resistant structure on the inner surface of the pipe, including both pipe ends, and on the joint insertion part. A conceptual cross-sectional configuration diagram of the composite reinforced concrete pipe provided, and FIGS. 5 1 to 5 are conceptual configuration explanatory diagrams showing various structures of conventional reinforced concrete pipes together with their joint structures, Figure 1 shows an A-shaped pipe, Figure 2 shows a B-shaped pipe,
3 describes a C-shaped tube, and FIGS. 4 and 5 each describe a propulsion tube. The names of each symbol shown in the attached drawings are as follows.
1...Reinforced concrete pipe body, 2...Pipe body 1
3...Groove of water stop means, 4...Pipe end of pipe body, 5...Exposed pipe made of corrosion-resistant resin, 6
...Protruding joint part of the outer pipe, 6A... High strength joint part, 7... Rubber gasket for water stop, 8...
...Inner surface of the tube body, 9... Corrosion-resistant resin coated inner tube, A... Corrosion-resistant portion, B... Portion equivalent to the joint, 1
1... Joint ring body, 12... Mortar component, 1
4... Annular joint portion, 15... Rubber gasket for water stop, 21... Steel collar for mounting the propulsion pipe, 25...
...Steel collar for mounting the propulsion tube.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) An overcoated pipe made of a corrosion-resistant resin containing reinforcing glass fibers is formed in close contact with the outer surface of a reinforced concrete pipe, and the overcoated pipe protrudes from one end of the reinforced concrete pipe to form a reinforced concrete pipe. The joint part has a joint part for connecting each other, and the joint part has a higher mixing ratio of the reinforcing glass fiber to the corrosion-resistant resin than other parts to have high strength, and the other end of the reinforced concrete pipe has a A composite reinforced concrete pipe, characterized in that it is configured to integrally form a joint insertion portion for watertight insertion into the joint portion of the composite reinforced concrete pipe. (2) The composite reinforced concrete pipe according to claim (1), further comprising a covered inner pipe made of a corrosion-resistant resin that is closely formed on the inner surface of the reinforced concrete pipe.