JPH0216683B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a Huum tube. More specifically, the present invention relates to a hume tube in which the joint portion is made of a synthetic resin ring.

A conventional pipe joint has a structure shown in FIGS. 1 to 3.

In the joint structure shown in Fig. 1, during molding, water separated from the concrete due to the action of centrifugal force accumulates on the back side of the mold for molding the socket part, preventing the filling of concrete. There is a risk that the inner surface 1 will not be formed smoothly and that the surface will be uneven. Therefore, the contact between the water-stopping rubber ring 2 and the inner surface 1 of the socket portion becomes insufficient, resulting in poor water-stopping properties. In addition, in this structure, since the outer diameter of the socket portion is larger than that of the main body portion, the width of the excavation groove must be made larger than the outer diameter of the tube body when burying the tube, resulting in an increase in construction costs.

In the joint structure shown in Figure 2, mortar caulking 5 is required to attach the concrete collar 4 to the pipe end 3, which increases the effort required and the construction cost due to the increased excavation width for the same reason as in Figure 1. cause an increase.

In the case of FIG. 3, the ring-shaped part 8 of the steel collar 7 is held between the concrete pipes 6, 6, the cylindrical part 9 is fitted into the recesses 10, 10 at the ends of the pipes, and the water-stop gasket 11 is inserted. , 11 are interposed between the cylindrical portion 9 and the recesses 10, 10.

However, when this pipe is used as a concrete pipe for propulsion, a gap of 1
2, or due to the collision between the collar 7 and the ground, the end 1 of the cylindrical portion 9 of the collar 7
No. 3 had drawbacks such as curling up as shown by the dotted line and poor water-stopping properties.

The present invention has been made in order to eliminate the above-mentioned drawbacks, and provides a method for manufacturing a hump pipe that maintains good water-stopping properties and has a joint part with a strong structure. A synthetic resin ring with a protrusion is formed on the inner surface of one half of the pipe from approximately the center in the length direction, and the protrusion is embedded in the concrete layer, and the synthetic resin ring is attached to the end of the pipe. The method of manufacturing Huyume tubes is characterized by their rigid connection.

The above synthetic resins include epoxy resin, polyester resin, alkyd resin, phenolic resin,
Urea resins, melamine resins, furan resins, diallyl phthalate resins, and the like can be used, but are not particularly limited to these.

In addition, hard fine aggregate is preferable as the aggregate, and if aggregates with different particle sizes are mixed in an appropriate ratio, the porosity will be reduced, and the synthesis necessary to fill the voids between the aggregates will reduce the porosity. A small amount of resin is sufficient, and workability during tube wall molding is also improved.

Any fiber may be used as long as it sinks into the synthetic resin layer by the action of centrifugal force, and for example, fibers made of plastic, glass, or steel can be used. The form of the fibers does not matter.

The solid material forming the protrusions may be aggregate, or may be a solid material made of metal, inorganic or organic compound, and in either case, the particle size must be 5 mm or more. is preferred.

In the manufacturing method of the present invention, first, a calculated amount of synthetic resin is poured into a horizontally placed formwork while rotating it, and then, before the synthetic resin hardens, fine aggregate is added. - Add each material in the order of fiber - fine aggregate, and finally add the solid material so that a part of it protrudes 1 mm or more from the inner surface of the ring to form a synthetic resin ring by centrifugal force. . For example, when the thickness of the synthetic resin ring is 10 mm, the formed fiber layer is approximately 2 mm thicker than the outer surface in the cross section of the synthetic resin ring.
Adjust the timing and amount of fiber input so that it is formed to a thickness of about 5 mm from the mm point. It is necessary to avoid exposing the fibrous layer to the vertical surface. The above-mentioned fine aggregate has the function of saving the synthetic resin material and positioning the fiber layer in the return.

The thickness of the synthetic resin ring can be appropriately determined depending on the outer diameter of the hume pipe to which it is rigidly connected. For example, for a 1000mm pipe, its wall thickness is 10
mm, and is formed to a thickness of 6 to 40 mm depending on the pipe diameter. In addition, instead of using a solid material, when the synthetic resin is hardened to some extent as shown in Figure 5,
Make unevenness or grooves on the inner surface with a tool,
A method of curing can be used.

Next, this synthetic resin ring with protrusions on its inner surface is placed in a formwork for forming hume pipes, and concrete is poured into it while rotating it horizontally according to the usual method, and centrifugal force is applied to the synthetic resin ring. Then, a compacted concrete pipe is formed. In this way, a synthetic resin ring having the same outer diameter as the hume tube can be rigidly connected to the end of the hume tube.

FIG. 4 or FIG. 5 shows an embodiment of the joining of Hume's canal according to the method of the present invention. As shown in the figure, on the other hand, a fiber layer 1 is provided on the outer periphery of the tube end 15 of the hume tube 14.
6 and a synthetic resin ring 18 containing fine aggregate 17 are rigidly connected via a solid object 19 protruding from the inner surface of the ring or a groove 19' formed on the inner surface of the ring, and the pipe of the other hume pipe 24 is Notch 21 on the outer periphery of the end 20
A gasket 22 is disposed between the ring 18 and the synthetic resin ring 18. The inner surface 23 of the synthetic resin ring 18 rigidly connected to the hume tube 14 is extremely smooth, and the inner surface 23 of the ring and the gasket 22 are in perfect contact, resulting in a strong joint structure.

The synthetic resin ring 18 has the same outer diameter as the outer diameter of the fume tube and is rigidly connected to the end, so the steel collar cannot be flipped up like the current steel collar tube (see Figure 3). , does not impair water-stopping properties.

In addition, the synthetic resin ring 18 is rigidly connected to the hume tube at its protruding portion by the action of centrifugal force at the same time as the hume tube is formed, so that a strong bonding structure is formed. Furthermore, since the joint structure is composed of a ring made of synthetic resin with smooth inner and outer surfaces and a water-stop gasket, the joint after construction has excellent corrosion resistance.

[Brief explanation of drawings]

FIGS. 1 to 3 are cross-sectional views of conventional concrete pipe joints, and FIGS. 4 and 5 are cross-sectional enlarged views illustrating the state of forming the hume pipe joint according to the present invention. 14, 24... Huyume tube, 15... Tube end of hume tube 14, 16... Fiber, 17... Fine aggregate,
18...Synthetic resin ring, 19...Solid substance protruding from the inner surface of the ring, 19'...Groove formed on the inner surface of the ring,
20... Tube end of hume tube 24, 21... Notch on outer periphery, 22... Gasket, 23... Ring inner surface.

Claims (1)

[Scope of Claims] 1. A synthetic resin ring is formed in which a fiber layer is provided within the ring and a protrusion is formed on the inner surface of one half of the ring from approximately the center in the length direction, and the protrusion portion is built into the concrete layer. 1. A method for manufacturing a hume tube, which is characterized by rigidly connecting a synthetic resin ring to the end of the tube in such a manner as to 2. Pour synthetic resin into the rotating formwork, and before the synthetic resin hardens, feed it in the order of aggregate-fiber-aggregate to form a fiber layer inside the ring, approximately in the center of the lengthwise direction. Claim 1, characterized in that the synthetic resin ring is formed by embedding a solid substance in one half so that a part thereof protrudes from the inner surface.
The manufacturing method of the Huum tube described in Section 1.