JP2001260124A - Method for manufacturing concrete tube covered with synthetic resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily adhere a concrete to a synthetic resin at a low cost when an inner peripheral surface of a concrete tube is to be covered with the resin having an anticorrosive function and to sufficiently secure an adhering strength of the concrete to the resin. SOLUTION: A method for manufacturing the concrete tube A covered at an inner peripheral surface with the synthetic resin comprises the steps of standing a synthetic resin tube 2 longitudinally so as to become an inner surface of the tube A to form an inner form, coating its outer peripheral surface with an adhesive 3, and standing outer forms 9 parallel to the form 2 at a predetermined interval at an outside of the form 2. The method further comprises the steps of placing a concrete 1 between the form 2 and the forms 9, and adhering the concrete 1 to the tube 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a synthetic resin-coated concrete pipe, and more particularly to a synthetic resin-coated concrete pipe using a synthetic resin pipe having an anticorrosion function on the inner peripheral surface of a concrete pipe for sewerage. And a method for producing the same.

[0002]

2. Description of the Related Art Conventional sewage pipes are made of concrete and are therefore susceptible to chemical erosion by acids, alkalis and the like, resulting in deterioration due to corrosion.

As shown in FIG. 5 (a), a synthetic resin sheet 2 is adhered to the inner surface of concrete 1 as a method for preventing deterioration. However, since synthetic resin sheet 2 cannot be directly adhered to concrete 1, Raised fibers of a bulky fiber fabric laminated integrally with the synthetic resin sheet 2 in a layer of an adhesive 3 applied to the inner surface of the concrete 1 with a bulky fiber layer 4 interposed on the back surface of the synthetic resin sheet 2 The concrete 3 is bonded to the synthetic resin sheet 2 by hardening the adhesive 3 while the concrete 1 is embedded.

On the other hand, as a method of bonding the concrete 1 and the sheet 2 without using an adhesive, a high-density polyethylene sheet 2 having spherical projections 5, 5 at predetermined intervals as shown in FIG. Are arranged along the inner surface of the concrete 1 so that the projections 5, 5... Of the sheet 2 are embedded in the concrete 1 and the concrete 1 and the sheet are rubbed by the frictional force of the projections 5, 5,. There is something that adheres to.

[0005]

The bonding method of interposing the bulky fiber layer involves preparing a bulky fiber and bonding the sheet and the bulky fiber in advance before bonding the sheet to concrete. Therefore, the number of extra steps increases and the cost increases. Also, the adhesive strength between the sheet and the bulky fibers is not so high because the penetration of the adhesive is difficult.

On the other hand, in the bonding method using a sheet having projections, since the projections are provided on the sheet itself, the processing of the sheet becomes difficult and the material cost increases. In addition, since the adhesive strength cannot be obtained in portions other than the protrusions in the concrete,
A uniform adhesive function between the concrete and the sheet cannot be maintained.

Therefore, when manufacturing a concrete pipe,
Using a synthetic resin tube with a corrosion-resistant function on the inner peripheral surface of concrete, it can be easily and inexpensively bonded to the concrete,
In addition, there arises a technical problem to be solved in order to obtain a method of manufacturing a synthetic resin-coated concrete pipe capable of achieving high bonding strength, and an object of the present invention is to solve this problem.

[0008]

DISCLOSURE OF THE INVENTION The present invention has been proposed to achieve the above object. In a method for manufacturing a concrete pipe in which the inner peripheral surface of concrete is covered with a synthetic resin, the method comprises the steps of: An inner mold is formed by being erected in the longitudinal direction so as to be an inner surface of the concrete pipe, an adhesive is applied to an outer peripheral surface thereof, and further, the inner mold is provided at a predetermined interval outside the inner mold. Manufacturing of a synthetic resin-coated concrete pipe in which concrete is cast between the inner mold and the outer mold to bond the concrete and the synthetic resin pipe. It provides a method.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. The same components as those of the conventional example will be described using the same reference numerals. FIG. 1 is a perspective view of the synthetic resin tube 2. The synthetic resin pipe 2 is
It is a prefabricated pipe made in advance at a factory and is made of a synthetic resin such as a vinyl chloride resin, a polyethylene resin, or a polypropylene resin, and has a thickness sufficient to withstand the casting pressure of the concrete 1 described later. A hard vinyl chloride resin is preferably used from the viewpoint of economy and the like. When the synthetic resin pipe 2 is used, for example, for the inner peripheral surface of a concrete sewer propulsion pipe, a pipe having a diameter of 800 mm or less is used, and its length is equal to the length of a concrete pipe A described later. The same. Therefore, the ready-made pipe (synthetic resin pipe) 2 having a corrosion-proof function is used as an inner mold when the concrete 1 is cast, which will be described later. It has excellent chemical properties, abrasion resistance and water shielding.

Next, an inner mold made of the synthetic resin pipe 2 is erected in the longitudinal direction so as to be the inner surface of the concrete pipe A, and an adhesive 3 is uniformly applied to the outer peripheral surface thereof.

The adhesive 3 is, for example, a chloroprene rubber-based adhesive so that the adhesive strength between the synthetic resin pipe 2 and the concrete 1 to be described later can be sufficiently obtained.

Next, FIG. 2 shows a rebar basket 6 as a core material for manufacturing a concrete pipe A described later, and vertical bars 7a having a predetermined length at predetermined intervals in the longitudinal direction according to the size of the concrete pipe A. Are arranged at predetermined intervals along the outer periphery or inner periphery of the vertical bars 7a, 7a at right angles to the vertical bars 7a, 7a. Streaks 7a, 7
.. and the horizontal streaks 7b, 7b... are bound together by a binding wire 8 or the like to form a basket.

The horizontal stripes 7b, 7b...
a may be spirally wound around the outer periphery of a. Further, both ends of the vertical streaks 7a, 7a.
b, 7b... are made slightly protruding, and their lengths are the same so that the rebar cage 6 can be erected vertically in the longitudinal direction. The diameter of the reinforcing bars of the vertical bars 7a, 7a,... And the horizontal bars 7b, 7b,.

Next, concrete pipe A will be described with reference to FIGS.
Will be described. The production of the concrete pipe A
For example, it is assumed to be performed near the sewer construction site, and first, FIG.
As shown in (1), the above-described inner mold made of the synthetic resin pipe 2 is erected on a mold (not shown) provided vertically below the concrete pipe A so as to be in the longitudinal direction of the concrete pipe A. The length of the inner form 2 in the longitudinal direction is the same as the length of the concrete pipe A. Next, the adhesive 3 is evenly and uniformly applied to the outer peripheral surface of the inner mold frame 2. Thereafter, the above-described reinforcing cage 6 is assembled outside the inner mold frame 2 at predetermined intervals in parallel with the inner mold frame 2. The rebar basket 6 is assembled and placed in advance, and the inner form 2
May be inserted from above.

Next, as shown in FIG. 4, a cylindrical outer frame made of a steel plate having the same length as the concrete pipe A is provided on the outer side of the reinforcing rod cage 6 and on the outer periphery of the concrete pipe A. 9 is erected in parallel with the reinforcing bar cage 6. Thereafter, the concrete 1 is cast from the upper portion between the inner mold 9 made of the synthetic resin pipe 2 and the outer mold 9 by the concrete casting pipe 10 to manufacture the concrete pipe A. At this time, since the inner mold made of the synthetic resin pipe 2 is made of a hard material, the inner mold itself can sufficiently withstand the cast concrete pressure without putting a reinforcing material inside. In addition, the adhesive 3 applied to the outer peripheral surface of the synthetic resin pipe 2 and the concrete 1 can be reliably bonded to each other by the hardening of the concrete 1 by casting the concrete 1, and integration can be achieved. .

When the concrete 1 is cast, a vibrator (not shown) is provided outside the outer formwork 9 to improve the fluidity of the cast concrete inside the formwork and to improve the flowability of the concrete inside the concrete form. Can be diverged to the upper part.
After the concrete is cast, the upper surface is iron-finished and cured, and then the outer mold 9 is removed to complete the concrete pipe A. After the release of the outer mold frame 9, the inner surface is cramped, and the resultant is diverted to the production of the next concrete pipe.

The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.

[0018]

As described above, according to the present invention, the synthetic resin pipe itself is used as an inner mold, and an adhesive is applied to the outer peripheral surface and bonded to concrete, so that special processing can be performed on the synthetic resin pipe. In addition, a ready-made tube can be used as it is, and it can be easily and inexpensively bonded, and a uniform and high adhesion strength between the synthetic resin tube and the concrete is obtained. Also, since the inner formwork after casting the concrete becomes the inner surface of the concrete pipe as it is, there is no need for convulsions, and the use of the concrete pipe increases the resistance to acids, and is sufficiently sufficient even in a corrosive environment. It will be endurable.

Further, concrete is cast after the outer formwork is erected at predetermined intervals on the inner formwork and the outside thereof, so that concrete pipe can be manufactured by vertical beating without equipment cost. , Can be easily manufactured on-site. In this way, the present invention has various effects that are extremely significant, such as shortening the manufacturing process of the concrete pipe and contributing to a reduction in manufacturing cost.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of the present invention and showing a state in which an adhesive is applied to an outer peripheral surface of a synthetic resin pipe.

FIG. 2 is a perspective view showing an assembled state of a reinforcing rod cage.

FIG. 3 is a perspective view showing a state where an inner formwork and a reinforcing bar cage are erected.

FIG. 4 is a perspective view showing a production state of a concrete pipe.

FIG. 5 (a) is a longitudinal sectional view showing a state where a sheet is adhered to the inner surface of concrete of a conventional example. (B) A longitudinal cross-sectional view showing a state in which a sheet having a protrusion is adhered to the inner surface of concrete of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete 2 Synthetic resin pipe (inner form) 3 Adhesive 9 Outer form A Concrete pipe

Continued on front page (72) Inventor Makoto Kishitani 2-1 Tsukudo-cho, Shinjuku-ku, Tokyo Tokyo Main Office (72) Inventor Hirokazu Tanaka 2-1 Tsukudo-cho, Shinjuku-ku, Tokyo Tokyo, Kumagaya Gumi In-house (72) Inventor Satoshi Matsuda 2-1 Tsukudo-cho, Shinjuku-ku, Tokyo F-term (reference) 2D063 BA19 BA31 BA34 3H111 AA01 BA07 CB03 CB08 CB14 DA08 DB05 EA03 4G058 AA01 AB04 AD01 AE11 AE17 EA00

Claims (1)

[Claims] 1. A method of manufacturing a concrete pipe in which an inner peripheral surface of concrete is covered with a synthetic resin, wherein a synthetic resin pipe is erected in a longitudinal direction so as to be an inner surface of the concrete pipe to form an inner mold. At the same time, an adhesive is applied to the outer peripheral surface, and an outer mold is erected at predetermined intervals outside the inner mold in parallel with the inner mold. Thereafter, the inner mold and the outer mold are erected. A method for producing a synthetic resin-coated concrete pipe, wherein concrete is cast between the frame and the concrete and the synthetic resin pipe are adhered to each other.