JPH07115365B2 - Manufacturing method of lining material for repairing existing human hole in sewer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a lining material for repairing an existing human hole in sewers.

[0002]

2. Description of the Related Art Conventionally, the inner wall of an existing manhole (so-called manhole) in the sewer has been corroded by the passage of a long time.
Due to the external pressure from the surroundings, or the expansive compound generated by the reaction between hydrogen sulfide generated by the corrosion of proteins contained in the fluid and the alkaline component in the concrete component,
This may cause unexpected cracks and damage.

When these cracks and damages occur,
Due to the infiltration of groundwater, etc., especially in rainy weather, the amount of sewage that exceeds the treatment capacity of the sewage treatment plant may flow in.

For repairing an existing human hole, a bottomed cylindrical lining material made of synthetic resin, which covers the inner wall of the existing human hole in sewerage, has recently been used. This lining material is placed between the peripheral wall of the existing human hole. After arranging with a required gap left, finally, a filler such as an emulsion polymer cement paste (so-called cement milk) was poured into the gap to cure it.

[0005]

However, when a long time has passed after the repair, groundwater invades from a cracked portion of the filler or the like, and the filler and the lining material are separated from each other by the pressure of the groundwater, Wall of lining material,
In particular, there was a problem that the peripheral wall partially bulged inward.

Therefore, conventionally, an anchor projection is provided on the outer surface of the peripheral wall of the lining material to prevent the peripheral wall from bulging (see, for example, Japanese Patent Application Laid-Open No. 3-293431). Since the projecting protrusions are individually attached by adhesion, welding, or the like after the lining material is molded, there is a problem that the attachment is very troublesome.

The object of the present invention is to solve the above-mentioned problems of the prior art, and to form a large number of projections simultaneously with the molding of the lining material on the outer surface of the peripheral wall of the existing lining material for repairing human holes in sewerage. The protrusion for locking can be efficiently formed at the tip of each protrusion, and the lining material with protrusions having an anchor effect can be manufactured very productively and at low cost. Another object of the present invention is to provide a method of manufacturing a lining material for repairing an existing human hole in a sewer system, which can surely prevent partial bulging of the peripheral wall of the hole lining material.

[0008]

In order to achieve the above object, the present invention is a method for producing a synthetic resin lining material for repairing an existing human hole in a sewer by rotational molding.
A large number of recesses for forming projections are formed on the barrel wall of a bottomed tubular rotary molding die, and synthetic resin lining material is introduced into this rotary molding die to perform rotary molding. The first step of forming a lining material provided with protrusions on the peripheral wall, a heater is pressed against the tip of each protrusion of the lining material to partially heat it, and the tip is deformed so as to project outward, The gist is a method of manufacturing a lining material for repairing an existing human hole in sewer, which comprises a second step of forming a locking protrusion at the tip of each protrusion.

In the first step, linear low density polyethylene (so-called linear polyethylene), high density polyethylene having side chains, polypropylene, etc. are used as the synthetic resin constituting the bottomed cylindrical lining material. Of these, it is preferable to use linear low-density polyethylene. The linear low-density polyethylene lining material can be folded and restored by steam, and can sufficiently withstand the load of the filler made of polymer cement paste injected on the back surface. Therefore, no deformation occurs. The lining material made of linear low-density polyethylene is described in detail in Japanese Patent Application No. 3-220383 previously proposed by the present applicant.

Referring now to FIG. 1, the rotational molding die (20) used in the first step of the method of the present invention has a large number of projection forming recesses (22) in its barrel wall (21). However, to form these recesses (22), for example, a mold
A large number of through holes (23) are formed in the tubular body wall (21) of (20), and the tapered inner peripheral surface (22) is formed on the outer peripheral edge of these through holes (23).
The cap-shaped member (24) having a) is covered, and the cap-shaped member (24) is fixed to the body wall portion (21) by welding. Although illustration is omitted, a split mold is usually used as the rotational molding die (20) in order to remove a molded product from the mold.

Next, referring to FIG. 2 and FIG. 3, each protrusion (15) formed on the peripheral wall (14) of the lining material (11) is formed by using the rotational molding die (20). For example, height (H) 1
It has a diameter of 5 to 30 mm and a tip diameter (D) of 10 to 50 mm, and each projection (15) is provided with a tapered outer peripheral surface (15a).

Further, referring to FIGS. 3 and 4, in the second step of the method of the present invention, the heater (25) is attached to the tip of each protrusion (15).
The diameter of the locking protrusion (16) formed by pressing against is 1.5 times to 3.0 times the diameter (D) of the base before deformation of the protrusion (15).
It is preferably doubled.

The number of the protrusions (15) formed on the peripheral wall (14) of the lining material (11) is 1 kg for the peripheral wall (14) as a whole.
The pressure may be such that it can withstand a pressure of / cm ² , and for example, it is preferably 1/20 cm ² to 1/30 cm ² , usually 1/25 cm ² .

Further, referring to FIG. 3, as a heater (25) used in the second step, for example, a heating element (26) such as a nichrome wire and an insulating coating member (27) made of synthetic resin or synthetic rubber for covering the heating element (26). ) Band heater and the like, the heater (25) has a radius (R) crossing so as to form a locking protrusion (16) at the tip of each protrusion (15). A recess (28) having a substantially arcuate shape is provided.

Here, the radius (R) of the recess (28) is usually 0.75D to 1.5D, and the depth (h) of the recess (28) is 0.2H to 0.8H. Is preferred.

The radius (R) of the concave portion (28) is 0.75D.
If it is less than the above range, the locking protrusion (16) at the tip of the protrusion (15) becomes small and there is no anchor effect, which is not preferable. When the radius (R) of the recess (28) exceeds 1.5D, the protrusion (15)
The protrusion (16) for locking at the tip tends to be uneven,
It is not preferable because the strength is insufficient. If the depth (h) of the concave portion (28) is less than 0.2H, the overhanging portion (16) for locking becomes small and there is no anchor effect. Further, when the depth (h) of the concave portion (28) exceeds 0.8H, the height (H) of the protrusion (15) becomes relatively low, and there is no anchoring effect.
Not preferable.

The temperature of the heater (25) is, for example, 135 ° C. to 155 ° C. when linear low density polyethylene is used as the synthetic resin constituting the lining material (11).
Here, if the temperature of the heater (25) is less than 135 ° C,
It is not possible to form the locking overhang (16), and the heater
If the temperature of (25) exceeds 155 ° C, the locking overhanging part (16) is deformed by its own weight, and a sufficient anchor effect cannot be expected, which is not preferable.

A lining material (11) for repairing an existing human hole of sewer manufactured by the present invention is shown in FIG. 5, for example.

Such a lining material (11) has a bottom wall (12).
And an upper wall (13), and a steam introduction port (17) and an air discharge port (18) are opened in the upper wall (13).

Further, the projections (15) formed on the peripheral wall (14) of the lining material (11) are preferably arranged in a so-called staggered arrangement, whereby the existing human hole (1) is formed as shown in FIG. When the filler (10) such as polymer cement or paste flows into the gap between the peripheral wall (1c) and the peripheral wall (14) of the lining material (11), the flow and wraparound of the filler (10) are considered to be good. Become.

[0021]

The lining material (11) for repairing the existing human hole of the sewer manufactured according to the present invention is shown, for example, in FIG. 5. According to the case of the present invention, first, in the first step,
As shown in FIG. 1, the inner wall surface (22a) is tapered on the body wall (21).
The lining material raw material made of synthetic resin is introduced into a rotational molding die (20) having a large number of projection forming recesses (22) having a plurality of protrusions, and rotational molding is performed. As shown in FIG. The lining material (11) provided with the peripheral wall (14) with 15) is molded.

In this case, the projection (15) formed on the peripheral wall (14) of the lining material (11) is provided with a tapered peripheral surface (15a) as shown in FIG. The protrusion (15)
Is also preferable because it is easy to come out from the recessed portion (22) on the mold (20) side having the tapered inner peripheral surface (22a), and the repair lining material (11) after molding is easily taken out from the mold (20). .

Next, in the second step, as shown in FIG. 3, the heater (25) is pressed against the tip of each protrusion (15) of the lining material (11) to partially heat the tip (15). Is deformed so as to project to the outside, and as shown in FIGS. 4 and 5, a locking projecting portion (16) is formed at the tip of each projection (15).

Therefore, according to the method of the present invention, in the first step, a large number of protrusions () are formed simultaneously with the molding of the lining material (11) on the outer surface of the peripheral wall (14) of the existing human hole repairing lining material (11). 15) can be formed, and then, in the second step, the protrusions (16) for locking can be efficiently formed at the tips of the protrusions (15), and the protrusions having an anchor effect ( 15)
The attached lining material (11) can be manufactured with extremely high productivity and at low cost.

Then, by repairing the existing human hole (1) by using the lining material (11) manufactured by the method of the present invention, the protrusions (16) at the tips of the projections (15) are sufficiently secured. Due to its excellent anchor effect, its strength is very high
The bulging of the lining material peripheral wall (14) of (1) can be reliably prevented.

[0026]

Embodiments of the present invention will now be described with reference to the drawings.

The existing manhole in the sewer by the method of the present invention
Use the following synthetic resin lining material (11) for repair (1)
It was manufactured by carrying out two steps.

First Step First, a bottomed cylindrical rotational molding die (20) provided with a large number of projection forming recesses (22) having a tapered inner peripheral surface (22a) on a barrel wall (21). (See FIGS. 1 and 2), a raw material for a lining material made of linear low-density polyethylene having an average density of 0.925 g / cm ³ was introduced and rotationally molded to form a tapered peripheral surface.
A lining material (11) having a thickness of about 6 mm having a large number of protrusions (15) having (15a) on the peripheral wall (14) was molded (see FIG. 2).

Here, the rotational molding die (20) is shown in FIGS.
As shown in FIG. 5, a large number of through holes (23) are opened in the body wall (21), and the tapered inner peripheral surface (22) is formed on the outer peripheral edge of each through hole (23).
The cap-shaped member (24) having a) is covered and welded to form a large number of recesses (22) for forming projections.The rotational molding die (20) is used for removing a die from a molded product. Therefore, the split mold was used.

The projections (15) formed on the peripheral wall (14) of the lining material (11) have a height (H) of 25 mm and a base diameter (D) of 10 mm, respectively, and the outer circumference of each projection (15). Face (15
The taper angle of a) was 3 °.

Further, since it has the tapered peripheral surface (15a), each projection (15) is easily removed from the recessed portion (22) of the mold (20) and is easy to take out.

The lining material (11) has a bottom wall (12) and a top wall (13), and the steam introduction port (1) is provided on the top wall (13).
7) and the air outlet (18) are opened.

Second Step Next, as shown in FIG. 3, each protrusion of the lining material (11)
The heater (25) is pressed against the tip of (15) to partially heat it, and the tip is deformed so as to project to the outside,
As shown in Fig. 4, the protrusions (1) for locking are attached to the tips of the protrusions (15).
6) was formed.

Here, as the heater (25), a band heater is used, and the heater (25) is formed with a locking protrusion (16) at the tip of each protrusion (15). A recess (28) with radius (R) = 1.5D and depth (h) = 0.6H is provided, and the temperature of the heater (25) is 14
It was set to 5 ° C.

The locking protrusion (16) formed at the tip of each projection (15) in this second step is 1.5 times the base diameter (D) of the projection (15) before deformation. .

The number of the protrusions (15) as a whole is equal to that of the peripheral wall (1
It is sufficient that 4) can withstand a pressure of 1 kg / cm ² , and in this embodiment, 1 piece / 25 cm ² .

Using the lining material (11) produced by the method of the present invention, the existing human hole (1) in the sewer was repaired as follows.

First, as shown in FIG. 6, the lining material (11)
Is folded into a size of 500 mmφ so that it is smaller than the upper end opening (1b) of the existing human hole (1), and the existing human hole (1) is
It was inserted from the upper opening (1b).

After the insertion, heating steam is put into the folding bottomed cylindrical lining material (11) through the introduction port (17) to soften the constituent resin of the lining material (11) and
1) was restored to a bottomed tubular shape as shown in FIG. 5 with a vapor pressure of 1.3 kgf / cm ² .

Then, after switching the heating steam to compressed air and cooling and solidifying the lining material (11), the upper wall (13) of the lining material (11) is cut and removed as shown in FIG. The bottom wall (12) of the lining material (11) has an existing human hole.
A water passage hole (19) corresponding to the groove (2) in the bottom portion (1a) of (1) was opened.

Finally, in the gap between the peripheral wall (1c) of the existing human hole (1) and the peripheral wall (14) of the lining material (11), the specific gravity of 1.
A filler (18) made of 8 g / cm ^{3 of} an emulsion polymer cement paste (so-called cement milk) is poured and hardened to form a bottomed cylindrical lining material.
(11) was fixed to the inner surface of the peripheral wall (1c) of the existing human hole (1), and thereby the inner wall of the existing human hole (1) was repaired.

Thus, a large number of protrusions formed on the peripheral wall (14) of the lining material (11) manufactured by the method of the present invention.
Since the locking protrusions (16) are provided at the tips of (15), respectively, after curing of the filler (10) made of polymer cement paste injected to the back surface of the lining material (11), Not only can it withstand the load of the filler (10) itself, but also prevent partial bulging of the lining material peripheral wall (14) due to the action of pressure such as groundwater in the repaired human hole (1). It was possible to repair the existing manhole (1) without fail.

[0043]

As described above, the present invention is a method for manufacturing a synthetic resin lining material for repairing an existing human hole in a sewer by rotational molding, which comprises a barrel wall portion of a bottomed cylindrical rotational molding die. First, a large number of concave portions for forming projections are formed, and a synthetic resin lining material raw material is introduced into the rotational molding die to perform rotational molding, thereby forming a lining material having a large number of projections on the peripheral wall. In one step, a heater is pressed against the tip of each protrusion of the lining material to partially heat it, and the tip is deformed so as to project to the outside, and a locking protrusion is provided at the tip of each protrusion. According to the method of the present invention, in the first step, a large number of protrusions can be formed on the outer surface of the peripheral wall of the lining material simultaneously with the molding of the lining material. In the second step, the protrusions for locking can be efficiently formed at the tips of the protrusions, and as a result, the lining material with protrusions having the anchor effect can be manufactured very efficiently and at low cost. There is an effect that can be.

By using the existing human hole repairing lining material manufactured by the method of the present invention, it is possible to sufficiently withstand the load of the filler itself after the filler injected on the back surface of the lining material is cured. Of course, it is possible to prevent partial bulging of the peripheral wall of the lining material due to the action of the pressure of ground water or the like in the repaired human hole, and it is possible to reliably repair the existing human hole. In addition, there is very little on-site work, repair work is extremely simple, repair costs are low, and even at intersections with heavy traffic, traffic congestion is minimized and repair work on existing human holes is performed. It has the advantage that it can be implemented.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of a rotary molding die that performs a first step of a method for manufacturing an existing human hole repairing lining material of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of the mold, showing a state in which a lining material with protrusions is being molded.

FIG. 3 shows a state before performing a second step of the method of the present invention, and is an enlarged cross-sectional view of a main part of a lining material with protrusions and a heater.

FIG. 4 is an enlarged cross-sectional view of a main part of a lining material with protrusions after performing the second step of the method of the present invention.

FIG. 5 is a partially cutaway side view of an existing lining material with protrusions for repairing a human hole manufactured by the method of the present invention.

6 is a cross-sectional view of an existing human hole showing a state in which the repair lining material of FIG. 5 is folded into a small size and inserted inside.

FIG. 7 is a sectional view of a human hole after being repaired with a lining material with protrusions.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Existing human hole 10 Filler 11 Synthetic resin lining material 14 for repair 14 Circumferential wall 15 Protrusion 15a Tapered peripheral surface 16 Overhanging portion for locking 20 Rotation molding die 21 Body wall 22 Protrusion forming concave portion 22a Tapered inside Peripheral 25 heater

Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display area E02D 29/12 B29L 23:00

Claims (1)

[Claims] 1. A method for producing a synthetic resin lining material (11) for repairing an existing human hole of sewer by rotational molding, comprising:
A large number of recesses (22) for forming protrusions are formed in the barrel wall (21) of the bottomed tubular rotational molding die (20), and the rotational molding die (2
(0) A synthetic resin lining material raw material is introduced and rotationally molded, and a lining material (1) provided with a large number of protrusions (15) on the peripheral wall (14)
1st step of molding 1) and each projection (1) of the lining material (11)
The heater (25) is pressed against the tip of (5) to partially heat it, and the tip is deformed so as to project to the outside, and the locking projection (16) is attached to the tip of each protrusion (15). The manufacturing method of the lining material for the existing human hole repair of a sewer which consists of the 2nd process of forming).