JPS61103084A - Composite reinforced concrete pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention generally relates to reinforced concrete pipes, and more specifically, to corrosion resistance of reinforced concrete pipes, particularly on the outer surface. The present invention relates to a composite reinforced concrete pipe having an outer pipe made of a corrosion-resistant resin, a part of which is configured as a joint part, which can satisfactorily increase the corrosion resistance.

``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]), in order to connect certain reinforced concrete pipes that are made of pipe bodies 10 with a uniform diameter, the end surfaces of the pipe bodies 10 are butted together, and a joint member that is A ring body 1) made of concrete or iron having a suitably large inner diameter is used, and a morcle combo 12 is installed in the gap between the pipe body 10 and the ring body 1) as a water stopping means. On the other hand, the B-shaped pipe has an annular joint part 14 integrally formed with a bulge at one end of the pipe body 13, as shown in FIG.
%! of the other party is provided in this annular joint portion 14. ; The ends are inserted and connected, and a rubber gasket 15 is fitted to this connection part to constitute a water stop means. A C-shaped pipe is generally adopted as a large-diameter pipe, and does not have an annular body 1) or a protruding part such as an annular joint part 14 like A-shaped pipes and B-shaped pipes.
As shown in FIG. 3(3), the tube body 16 has a joint recess 17 at one end and a protrusion 18 that fits into the recess 17 at the other end. As a water stop means, a rubber gasket 15 is used as in the case of the B-shaped pipe.

The propulsion tube has a joint portion 20 formed at both ends of the tube body 19, a rubber gasket 15 is fitted to each core portion, and the two tube bodies are successively connected with a separate steel collar 21. (4)
In addition to the structure of the joint part 2 of the pipe body 22 as shown in the same figure (5),
A structure is also adopted in which a steel collar 25 is integrally joined to a steel collar 25 which is manufactured in advance, and a mating tube end 23 is press-connected to the collar 25 via a rubber gasket 15.

In addition, in the above-mentioned A-type pipe, there is also known a structure in which the ring body 1) is bonded to the end of the pipe body 10 with an appropriate adhesive or the like in advance, and a rubber gasket is used as a water-stopping means with the other pipe. ing.

``Problems to be solved by the invention'' The water-stop performance at the joints of reinforced concrete pipes with the above structure was determined to be 1 to 2 kg/kg/kg in joint water pressure tests in factories, etc.
CD can sufficiently withstand internal or external water pressure, but if it is buried in soft ground such as a landfill, the pipe may be pulled out at the joint due to uneven settlement of the pipe, causing damage to the pipe. Frequent intrusion of groundwater, etc. into the ground has become a major social problem at present, and there is a strong demand for the development of a joint structure that can cope with such uneven subsidence.

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 may gradually erode. There have also been cases where this has led to destruction. In particular, A-type pipes in which the ring body 1) is made of steel, and propulsion pipes with a joint structure consisting of steel collars 21 and 25, have problems caused by so-called stray currents, in addition to the acid corrosion problem described above. 1 after burial, as local corrosion or electrolytic corrosion is also added.
In less than 0 years, small holes appear in the ring, and there are many cases where groundwater and other substances enter the pipe through these holes.

"Means for Solving the Problems" In view of the above, the present invention forms a covered outer tube made of a corrosion-resistant resin containing reinforcing glass 1a fibers in close contact with the outer surface of a reinforced concrete pipe, and an end of the covered outer tube. The present invention provides a composite reinforced concrete pipe configured such that the joint portions are integrally extended and the joint portions are formed at the same time. In one embodiment, such a joint part has n.
It is possible to optimally set the mixing ratio of 1 m of reinforcing glass fibers to mono-edible resin to be high. A composite reinforced concrete pipe having an outer sheathed pipe in which such a joint part is integrally formed has good acid resistance and corrosion resistance, and also has a high-strength joint structure itself. It is possible to obtain a reinforced concrete pipe with an extremely simple structure.

Reinforced glass like the one above! Corrosion-resistant resin containing l (Y,
By forming this in close contact with the inner surface of a reinforced concrete pipe to form a covered inner pipe, it is possible to provide a composite reinforced concrete pipe that can enhance properties such as acid resistance and corrosion resistance on the inner surface of the pipe. .

"Function and Examples" FIG. 1 shows a conceptual partial cross section (!・!) of a composite reinforced concrete pipe constructed according to an embodiment of the present invention, and shows the main body of the reinforced concrete pipe that can be formed by a conventional method. , in the case shown in the figure, a joint spigot 2 is formed at the left end with an appropriate length, and is 20 to 50 mm from the end surface of the spigot 2.
1) A groove 3 is carved at a depth of about 3 to 5+ mm on the outer periphery at a suitable location, so that a rubber gasket 7 as a landscaping means can be appropriately fitted as described later. In accordance with the present invention, on the outer surface of the reinforced concrete pipe main body 1, a joint portion 6 extending and projecting from the pipe end 4 and the entire circumference excluding the joint insertion portion 2 is integrally formed in this embodiment. 5 are formed in a thin and close contact manner, thus constructing 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 it is preferable that an appropriate amount of reinforcing material such as reinforcing glass fiber be mixed into the resin. Such an outer sheathed pipe 5 is manufactured in advance to have the same length as the reinforced concrete pipe main body 1, for example.
By shifting this from the joint opening part 2 of the reinforced concrete pipe body 1 and closely arranging it on the outer periphery, a joint part 6 having a length corresponding to the joint opening part 2 is immediately formed to protrude from the pipe end 4. I can do it.

) The protruding length of the joint portion 6 can be arbitrarily determined depending on the diameter of the reinforcing bar, the concrete pipe, and other structures, and can be set to about 10 cm, for example. In addition, the thickness of the corrosion-resistant resin coating outer layer 5 including the joint portion 6 should of course be configured to a required thickness by taking into account the diameter of the reinforced concrete pipe main body 1, etc., but in special cases. T! ! Generally speaking, a value of about 4 to 10 mm can be adopted. Note that the outer diameter of the joint spigot 2 is, for example, 3 to 51 I smaller than the outer diameter of the tube body l, and hence the inner diameter of the 41-hand portion 6.
It can be formed as small as about m.

Composite reinforced concrete pipes with the above-mentioned structure and joint function can be manufactured on a mass production scale at a practically adequate cost, and in order to connect them underground, as shown in Figure 2, Insert the joint opening 2 of the other composite reinforced concrete pipe into the joint part 6 of one composite reinforced concrete pipe while appropriately interposing water stop means such as gols and gaskets 7, and then repeat the same connection work sequentially. By repeating this process, it is possible to construct a pipeline of a length that meets 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 jacketed pipe 5 including the joint portion 6, and thereby has a suitable acid-resistant function and electrolytic corrosion-resistant function. A comprehensive corrosion-resistant structure for the entire pipeline can be easily achieved.

FIG. 3 is a cross-sectional view of the main parts of the composite reinforced concrete pipe described above, based on another embodiment of the present invention, which is configured to suitably ensure 8M strength at the joint portion. According to this embodiment, the joint portion 6A includes a portion approximately 20 to 30 cm from the tube end 4, as shown by portion B.
is constructed by increasing the amount of reinforcing glass fibers mixed in as a reinforcing member to the corrosion-resistant resin to about 20 to 50 parts, and the amount of reinforcing glass m fibers mixed in the other coated outer tube 5 shown in part A is as follows. As with the above-mentioned composite reinforced concrete pipe, emphasis is placed on corrosion resistance, and the amount is about 0 to 20 parts. Since the joint part 6A has such an MJ strong groove structure, the joint part 6 may be damaged due to uneven settlement after laying the connecting pipe.
It has sufficient strength to cope with the bending or tensile action applied to A.

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, 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 periphery of the joint portion 6.6A shown in . The part corresponding to the joint shown in part B above is the uncoated pipe 5.
The composition and mechanical strength of the pipe are designed and manufactured in several types, taking into consideration the overall factors of the buried pipe system. Hey, this c! It should be understood that modifications such as selectively combining them to construct a composite reinforced concrete pipe that is optimal for an electrical circuit system are also within the scope of the present invention. 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, Additionally, various embodiments with high strength joint structures are permitted.

The above-mentioned composite reinforced concrete pipe structure can provide sufficient performance in terms of corrosion resistance on the pipe outer surface and mvl strength of the joint part, but the inner surface 8 of the reinforced concrete pipe main body 1 or in addition to this, the both ends of the pipe In the case of a product that also requires corrosion resistance, as shown in FIG. In addition, as shown in Figure (2), by forming such a coating layer on the joint opening 2 as necessary, the corrosion-resistant structure of the entire inner and outer surfaces of the tube can be achieved. It is also possible to manufacture.

In each of the embodiments described above, when reinforcing material is mixed 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., reinforcing glass fibers 1a are used. Although an example of using the reinforced glass 1a is given, the reinforcing material or reinforcing material to be mixed into the corrosion-resistant resin is
It is essentially the intention of the present invention to use members that resemble or have the same effect as fibers, and there is no hindrance to the use of other appropriate materials.

"Effects of the Invention" By having the above configuration, the composite reinforced concrete pipe according to the present invention has at least the following features and effects.

fi+ Since the shape can be configured in a simple form with a uniform diameter, it does not have a protruding joint corresponding to the conventional A-type pipe or B-type 'ρ, etc., 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.

(2) It is possible to ensure good corrosion resistance functions such as acid resistance and #4 electrolytic corrosion resistance on the outer surface of the reinforced concrete pipe body, and by providing a similar corrosion-resistant structure on the inner surface of the pipe as appropriate, it is possible to prevent acidic water, etc. We can provide composite reinforced concrete pipes that can be suitably used as pipelines.

(3) Since the joint part constructed according to the present invention can have sufficient strength and length, it can prevent stress fractures caused by the Unconventional Law, etc., and prevent pipes from being pulled out from each other due to this. Even if the scenery is quite large, the intrusion of groundwater etc. can be suitably prevented.

(4) 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 that the consolidation or bonding performance will be severely impaired when the pipe is pulled out. It has been difficult to resolve the trade-offs in terms of water-stopping properties and bondability in the joint structure. In the structure of the joint part adopted in the present invention,
On the other hand, since the joint structure itself has appropriate elasticity, the synergistic effect of this elasticity and the consolidation elasticity of water-stopping means such as rubber gaskets makes it possible to achieve both water-stopping properties and bondability. An excellent joint structure can be provided.

(5) Therefore, by adopting 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 in the pipe. have

[Brief explanation of the drawing]

Fig. 1 is a conceptual partial cross-sectional configuration diagram of a composite reinforced concrete pipe according to an embodiment of the present invention, and Fig. 2 shows a buried pipe of a required length by connecting the composite reinforced concrete pipes of Fig. 1. Fig. 3 is a cross-section of a main part of a composite reinforced concrete pipe configured to suitably increase the strength of a joint to be formed on an uncoated pipe according to another embodiment of the present invention. The configuration diagrams, FIGS. 4(1) and 4(2), show a composite reinforced concrete pipe in which a corrosion-resistant structure is also provided on the inner surface of the pipe including both pipe ends and the joint opening according to still another embodiment of the present invention. A conceptual cross-sectional configuration diagram of and FIGS. 5(1) to 5(5)
1 is a conceptual configuration explanatory diagram showing various structures of conventional reinforced concrete pipes together with their joint structures;
(2) (2) describes the A-shaped tube, (3) the C-shaped tube, and (4) and (5) the propulsion tube. The names of the respective symbols shown in the attached drawings are as follows: 1: Reinforced concrete pipe body 2: Joint opening part of the pipe body 1 3: Water stop means groove 4: Pipe end 5 of the pipe body; Corrosion-resistant resin coating Outer tube 6: 6 protruding joints of the covered outer tube; High strength joint 7, Rubber gasket for ttJC 8: ¥!!;
Inner surface of main body 9: Corrosion-resistant resin coated inner tube A: #4 Corrosion-resistant part B: Joint equivalent part 1): For joint Ring body 12: Mortar combo 14: Annular joint part 15: For water stop Rubber gasket, 1' 21: Steel collar for mounting the propulsion tube 25: Collar for mounting the propulsion tube y! 1llll1 Figure 2

Claims (6)

[Claims] (1) An outer sheathed pipe made of a corrosion-resistant resin that adheres to the outer surface of the reinforced concrete pipe is provided, and the outer sheathed pipe is configured to have a joint portion that protrudes from the end face of the reinforced concrete pipe and connects the reinforced concrete pipes to each other. A composite reinforced concrete pipe featuring: (2) The composite reinforced concrete pipe according to claim (1), wherein the outer sheathed pipe is configured to include reinforcing glass fiber. (3) The composite reinforced concrete pipe according to claim (1), characterized in that the joint portion of the sheathed pipe is formed to have higher strength than other portions. (4) The composite according to claim (3), wherein the joint portion of the outer pipe is configured to have a higher mixing ratio of reinforcing glass fiber to the corrosion-resistant resin than other portions. Reinforced concrete pipe. (5) The composite according to any one of claims (1) to (4), which is made of a neo-container and includes a covered inner pipe made of a corrosion-resistant resin that is in close contact with the inner surface of the reinforced concrete pipe. Reinforced concrete pipe. (6) The composite reinforced concrete pipe according to claim (5), wherein the covered inner pipe is configured to include reinforcing glass fiber.