JP2857978B2 - Lining material for repairing existing manholes in sewers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lining material for repairing existing manholes in sewers.

[0002]

2. Description of the Related Art Conventionally, the inner walls of existing manholes (so-called manholes) in sewers have been subject to corrosion,
Aging may progress due to external pressure from the surroundings, or an intumescent compound or the like generated by a chemical change of the concrete component, and unexpected cracks or damage may occur.

[0003] When these cracks and damage occur,
There is a problem that infiltration of groundwater or the like may cause inflow of sewage exceeding the treatment capacity of the sewage treatment plant, especially in rainy weather. When a long period of time has passed since the repair, groundwater penetrates through cracks in the filler, etc., and the pressure of the groundwater causes the filler and the lining material to be separated from each other. There was a problem that swelling inward.

Accordingly, recently, as a method of repairing an existing human hole, a composite structure of a bottomed cylindrical lining material made of synthetic resin covering the inner wall of the existing human hole and a filler injected into the back surface thereof has been developed. Characteristic construction methods have been proposed.

[0005] As such a construction method, for example, in Japanese Patent Application Laid-Open No. Hei 5-301238 proposed by the present applicant, an anchoring projection is provided on the outer surface of the peripheral wall of the lining material, and after the repairing by the anchoring action of the projection. Bulging of the peripheral wall of the lining material due to the action of external pressure due to groundwater or the like in the human hole.

[0006]

However, according to the above-mentioned proposed method, a plurality of projections having a tapered peripheral surface are formed on the peripheral wall of the lining material simultaneously with the rotational molding of the lining material. By providing an overhang at the tip, so-called die-cutting of the molded product becomes impossible,
It was difficult. For this reason, after forming a large number of protrusions having a tapered peripheral surface without an overhanging portion at the time of rotational molding of the lining material, a heater is pressed against the tip of each projection, and partial heating is performed. Post-processing such as deforming the portion so as to protrude outward was performed, and a protruding portion for locking was provided at the tip of each projection.

Here, as the heat source of the heater, an electric heater or a gas burner is used, and a hot plate or a metal plate is pressed against the protrusion, and a protrusion for locking is integrally provided at the tip of each projection. In any case, since it is very difficult to control the heating temperature and the force at the time of deformation, variations in the shape and size of the overhang by integral molding are likely to occur, and therefore, in terms of strength, Variation was easy to occur. Moreover, at the time of material design, it is necessary to adopt the lower limit of the strength of the overhanging part, not the average value of the scattered strength.
Since the pull-out strength per piece is lower than the average value and the material is designed, if the pull-out strength per piece of the overhang is low, it is necessary to increase the number of protrusions of the lining material,
As a result, there has been a problem that the working time of the deformation processing of the overhang is long.

[0008] An object of the present invention is to solve the above-mentioned problems of the prior art, and to attach, to a plurality of projections formed at the same time as the rotational molding of the lining material, locking members made of separate members, respectively. The shape and size of the locking portion in each projection are made constant, whereby the pull-out strength of the projection with the locking member becomes extremely high, and the anchoring action can be reliably performed without causing variation in the strength surface, It is possible to reliably prevent partial bulging of the peripheral wall of the lining material of the repaired human hole, greatly increase the durability, and reduce the number of projections with locking members as the entire lining material. It is possible to provide a lining material for repairing existing manholes in sewage systems, which can perform mounting work of a locking member with good workability and in a short time, and can increase lining material production efficiency. There to.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention firstly has a first aspect which has a shape which covers an inner wall of an existing human hole in a sewer with a required gap, and which is provided with a bottom wall. A required number of protrusions are provided on a peripheral wall mainly composed of a synthetic resin repair cylindrical lining material having an upper wall, and a male screw portion is provided on a peripheral surface of each protrusion, and a female screw portion is provided on a male screw portion of each protrusion. The gist of the present invention is a lining material for repairing an existing human hole in a sewer, to which a locking member having a screw is attached and attached.

Next, a second invention mainly relates to a repairable cylindrical lining material made of synthetic resin having a shape to cover an inner wall of an existing human hole in a sewer with a required gap and having a bottom wall and an upper wall. Is provided with a required number of projections, and each projection is fitted with an annular locking member having a flange at the tip and made of a heat-resistant material, and protrudes outward from the distal end of each annular locking member. The outer end of the projection is deformed by heat to form a retaining projection that engages with the tip of the annular locking member.
The gist is a lining material for repairing existing manholes in the sewer.

In the above, as the synthetic resin constituting the bottomed tubular lining material for repairing the existing human hole, linear low-density polyethylene (so-called linear lowden polyethylene), high-density polyethylene having a side chain, and polypropylene And the like, and among them, it is preferable to use linear low-density polyethylene. The lining material made of such a linear low-density polyethylene can be folded and restored by steam, and can sufficiently withstand the load of a filler made of a polymer cement paste injected into the back surface. And does not deform. The lining material made of linear low-density polyethylene is disclosed in Japanese Patent Application Laid-Open No. 5-5973, which was previously proposed by the present applicant.
No. 9 discloses this in detail.

Next, a method for repairing an existing manhole in a sewer using the lining material of the present invention will be described with reference to the drawings.

First, as shown in FIG. 1, a cylindrical lower lining material divided body (11A) having an outer diameter and a bottom wall (12) to be accommodated in an existing human hole (1); (13) to produce a cylindrical upper lining material split (11B).

These lining material divided bodies (11A) and (11B)
Are manufactured by introducing a lining material raw material made of, for example, linear low-density polyethylene into a rotational molding die (not shown) and rotationally molding the same.

At this time, the upper and lower lining material divided bodies (11A)
The total height of (11B) should exceed the internal height of several existing manholes (1), and the measured height of the old manhole (1) to be repaired, which has become aging, should be Accordingly, the two lining material divided bodies (11A) and (11B) are combined to form the lining material main body (11).

Accordingly, there is no need to prepare a synthetic resin lining material (10) having various sizes according to the existing manhole (1), so that the number of molds for production is small, and the cost of production equipment and lining are reduced. The production cost of the material (10) itself is low. In addition, the storage space for the lining material (10) is reduced, the management and transportation to the repair site are simplified, and the repair cost of the existing manhole (1) is reduced.

A large number of projections (15) having a tapered peripheral surface are provided on the peripheral wall (14) of the lining material main body (11) composed of the upper and lower lining material divided bodies (11A) and (11B). The tapered peripheral surface of each projection (15) is for so-called die cutting. These projections (15) are, for example,
mm, distal diameter 10-50 mm, and proximal diameter 15-
It has 150 mm.

The peripheral wall of the lining material main body (11) shown in FIG.
The projections (15) formed on (14) are arranged in a grid pattern, but the projections (15) may be arranged in a so-called staggered arrangement.

Next, the height of the existing human hole (1) to be repaired (see FIG. 6) is actually measured, and the lower lining material divided body (11A) is measured.
The upper edge portion is cut by a required height (see a dashed line a in FIG. 1) and removed.

Then, as shown in FIG. 2, the connection edge portion (20) having a slightly smaller outer diameter at the lower end of the upper lining material split (11B) is cut into the lower lining material split (1B).
1A) is inserted inside the upper edge, and the upper and lower lining material divided bodies (11A) and (11B) are joined by welding and joined to form a height equivalent to the internal height of the existing human hole (1). A lining material main body (11) having

The upper wall of the lining material (11)
In (13), a steam inlet (27) and an air outlet (28) are opened.

In the first aspect of the present invention, the male screw portion (16) is provided on the peripheral surface of each projection (15), and the male screw portion (1) of each projection (15) is provided.
A locking member (17) having a female screw portion (18) is screwed and attached to 6) (see FIG. 3).

Here, as shown in FIG. 5, for example, in order to provide a male screw portion (16) on the peripheral surface of each projection (15) (FIG. 1A) of the peripheral wall (14) of the lining material main body (11). Using an electric die (30), a screw forming head (31) having a female screw portion (32) at the tip is fitted over the projection (15) of the lining material main body (11) to cover the head (31). Rotate to form an external thread (16) (FIG. 2b). A hexagon nut-shaped locking member (17) having a female screw portion (18) is shown in FIG. 4, for example, and the female screw portion (16) of the locking member (17) is attached to the male screw portion (16) of each projection (15). 18) is screwed, and the locking member (17) is attached (c in the same figure).

Here, the area of the projecting portion of the locking member (17) attached to the tip of each projection (15) is 1.0 to 25.0c.
m ² , preferably 3.0 to 20.0 cm ² .

The number of projections (15) on the peripheral wall (14) of the lining material (10) according to the present invention obtained as described above depends on the number of projections (15) to which the locking members (17) are attached. In this state, it is sufficient that the peripheral wall (14) as a whole can withstand a pressure of 1 kg / cm ^2. For example, the lining material (10)
Locking member per of the 20~30cm per ^second peripheral wall (14) (17)
About one projection (15), usually 25 cm ^{2 of the} same peripheral wall (14)
It is preferable that the number of the protrusions (15) with the locking members (17) is about one per hit.

Next, the lining material (10) is folded (not shown) so as to be smaller than the upper end opening (1b) of the existing human hole (1) to be repaired. In the existing manhole (1) shown in FIG.
After inserting, heating steam is introduced from the steam introduction port (27) opened in the upper wall (13) of the lining material main body, the constituent resin of the lining material (10) is softened, and the lining material ( 10) is restored to a bottomed cylindrical shape, cooled and solidified, and the upper wall (13) of the lining material (10) is cut and removed.

The existing manhole (1) to be repaired usually has a mortar-shaped bottom (1a) provided with an inverting portion (2) at the center of the lower end.
Lining material (10) at the center (1) of the bottom wall (12).
2a) is heated by a heater (not shown) so that the bottom (1a)
Is thermally deformed into a U-shaped cross section along the inner surface of the invert portion (2).

Finally, as shown in the figure, the emulsion-type polymer cement paste (emulsion polymer cement paste) is placed in the gap between the peripheral wall (1c) of the existing human hole (1) and the peripheral wall (14) of the lining material (10). A filler (19) made of so-called cement milk is poured in, hardened and fixed on the inner surface of the peripheral wall (1c) of the existing human hole (1), thereby repairing the inner wall of the existing human hole (1).

After the repair, the section U of the lining material (10)
At the left and right ends of the center part of the bottom wall (12a), water is passed in such a way as to correspond to the left and right sewage holes connected to both ends of the invert part (2) at the lower end of the peripheral wall (1c) of the existing human hole (1) Holes (21) are respectively formed, and a through-hole communicating with these is also formed in a corresponding portion of the cured filler (19).

As another method of providing a male thread portion (16) on the peripheral surface of each projection (15) of the peripheral wall (14) of the lining material main body (11), for example, as shown in FIG. Projection (15)
A hexagonal nut-shaped locking member (17) having a female screw portion (18) is directly fitted over the tip of (a in the same figure) (b in the same figure) and fitted to the hexagonal nut-shaped locking member (17). Fitting attachment
By using an electric drill (34) having (35), this hexagonal nut-shaped locking member (17) is rotated, whereby the male screw portion (16)
At the same time, the locking member (17) having the female screw portion (18) is screwed to the male screw portion (16) of the projection (15) (FIG. D).

Therefore, according to this method, a male screw portion (16) is formed on each projection (15), and a locking member having a female screw portion (18) is provided.
(17) can be attached at the same time, so that the workability is excellent.

A locking member (17) having a female screw portion (18)
May have other shapes, for example, a circular nut-shaped locking member (17a) shown in FIG. 9 and a cap nut-shaped locking member (22) having a circular flange (22) shown in FIG. 17b),
A cap nut-shaped engaging member (17c) having a hexagonal head (23) shown in FIG. 11 may be used.

Next, in the second invention, as shown in FIGS. 12 and 13, for example, each projection (15) of the lining material main body (11) has a flange (26) at the tip and is resistant to An annular locking member (25) made of a chemical, heat-resistant and rust-proof material is fitted and covered, and the outer end of the projection (15) projecting outward from the tip of each annular locking member (25) is heated. As a result, a retaining projection (15a) is formed which engages with the tip of the annular locking member (25).

[0034]

According to the lining material of the present invention, a plurality of projections formed at the same time as the rotation molding mainly composed of the lining material are provided with the locking members made of separate members, respectively. In addition, the shape and size of the locking portion provided on each projection are all constant, whereby the pull-out strength of the projection with the locking member is extremely high, and the anchoring action is performed without causing variation in the strength surface. Can be reliably achieved, and after the filler such as the polymer cement paste injected into the back of the lining material is hardened, it can sufficiently withstand the load of the filler itself. Therefore, it is possible to reliably prevent partial bulging of the lining material peripheral wall due to the action of external pressure such as groundwater in the repaired human hole, and to reliably repair the existing human hole, thereby improving durability. Can increase significantly.

Moreover, since the pull-out strength of the projection with the locking member is very high, the number of the projections with the locking member as the entire lining material can be reduced, and the mounting of the locking member can be performed with good workability. Since it can be performed in a short time, the production efficiency of the lining material can be improved.

[0036]

Next, embodiments of the present invention will be described with reference to the drawings.

In FIGS. 1 to 6, the existing manhole (1) of the sewer was repaired as follows using the lining material (10) of the present invention. The existing human hole (1) to be repaired has a diameter of the upper end opening (1b) of 600 mm, a diameter of the bottom (1a) of 900 mm, and a size of the bottom (1a) larger than the opening (1b). The height was 4.0 m.

Then, as shown in FIG. 1, a cylindrical lower lining material divided body (11A) having a bottom wall (12) and an upper wall (13) are provided.
And a cylindrical upper lining material divided body (11B) provided with These lining material splits (11A) and (11B) are prepared by feeding a lining material raw material made of linear low-density polyethylene having an average density of 0.925 g / cm ^{3 to} a rotational molding die (not shown). It is manufactured by introducing and rotational molding.

One of the lower lining material divided bodies (11A) is
It has an outer diameter of 850 mm, a thickness of about 8 mm, and a height of 2.0 m. The other upper lining material split (11B)
Has an outer diameter of 850 mm, a thickness of about 8 mm, and a height of 2.
A connecting edge (20) having a height of 200 mm and having a height of 7 m and having a slightly smaller outer diameter at the lower end is provided over the entire circumference.

A large number of projections (15) having a tapered peripheral surface are provided on the peripheral wall (14) of the upper and lower lining material divided bodies (11A) (11B). Here, each protrusion (15) has a height of 2
It has a diameter of 5 mm and a diameter of 10 mm.

Next, when the height of the existing human hole (1) in FIG. 6 to be repaired was actually measured, it was 4.0 m as described above, and as shown in FIG. Body (1
The upper edge of 1A) was cut by a height of 0.7 m (see a dashed line a in FIG. 1) and removed.

Then, as shown in FIG. 2, the connection edge portion (20) having a slightly smaller outer diameter at the lower end of the upper lining material split (11B) is cut into the lower lining material split (1B).
3A) is inserted into the inside of the upper edge portion, and the upper and lower lining material divided bodies (11A) and (11B) are joined by welding to be combined to correspond to the internal height of the existing human hole (1). A lining material main body (11) having a height of 0 m was made.

The upper wall (13) of the divided upper lining material (11B) was provided with a steam inlet (27) and an air outlet (28).

Next, as shown in FIG.
(0), a screw forming head (31) having a female screw portion (32) at the tip thereof is fitted over the projection (15) of the lining material main body (11), and the head (31) is rotated. A part (16) was formed (FIG. 2B). Then, a stainless steel hexagon nut type locking member (17) having a female screw portion (18) shown in FIG. 4 was screwed and attached to the male screw portion (16) of each projection (15) (c in FIG. 4). ). The projecting area of the locking member (17) attached to the tip of each projection (15) was 5 cm ² .

As shown in FIG. 3, the number of the projections (15) on the peripheral wall (14) of the lining material (10) according to the present invention thus obtained is determined by the number of the locking members (17) attached to each projection (15). In this state, it is sufficient that the peripheral wall (14) as a whole can withstand a pressure of 1 kg / cm ² , and in this embodiment, it is 1 piece / 25 cm ² .

Next, although not shown, the lining material
(10) is folded into a size of 500 mmφ so as to be smaller than the upper end opening (1b) of the existing manhole (1),
It was inserted from the upper end opening (1b) of (1).

After the insertion, heated steam is introduced into the folded bottomed tubular lining material (10) from the inlet (27) to soften the resin constituting the lining material (10), and the lining material (1
0) was restored to a bottomed cylindrical shape as shown in FIG. 5 at a vapor pressure of 1.3 kgf / cm ² .

Then, the heating steam is switched to compressed air to cool and solidify the lining material (10). Then, as shown in FIG. 6, the upper wall (13) of the lining material (10) is cut and removed. Existing manholes on the bottom wall (12) of the lining material (10)
The water hole (2) corresponding to the inverted part (2) at the bottom (1a) of (1)
Opened 1).

Finally, in the gap between the peripheral wall (1c) of the existing human hole (1) and the peripheral wall (14) of the lining material (10), a specific gravity of 1.
A filler (19) consisting of 8 g / cm ^{3 of} an emulsion polymer cement paste (so-called cement milk) is poured in and hardened to form a bottomed cylindrical lining material (1).
0) was fixed to the inner surface of the peripheral wall (1c) of the existing human hole (1), thereby repairing the inner wall of the existing human hole (1).

As described above, the peripheral wall (14) of the lining material (10)
At the tips of a number of projections (15) formed on each, a locking member (17) made of a separate member is attached, so that the shape and shape of the locking portion provided on each projection (15) The size is constant, and as a result, the projection (1) with the locking member (17) is
5) The pull-out strength is extremely high, and the anchoring action can be reliably achieved without causing variation in strength. Therefore, after curing of the filler (19) made of polymer cement paste or the like injected into the back of the lining material (10), it can sufficiently withstand the load of the filler (19) itself,
It is possible to prevent partial bulging of the lining material surrounding wall (14) due to the effect of the pressure of groundwater etc. in the repaired manhole (1), and it is possible to reliably repair the existing manhole (1). Was.

Embodiment 2 In this second embodiment, the lining material (1
Using (0), the existing manhole (1) of the sewer was repaired in the same manner as in the first embodiment. Here, the difference from the first embodiment is that each projection of the peripheral wall (14) of the lining material main body (11) is different.
A means for providing a male screw portion (16) on the peripheral surface of (15). That is, as shown in FIG. 8, a hexagonal nut-shaped locking member (17) made of stainless steel and having a female screw portion (18) shown in FIG. The hexagon nut-shaped locking member (17) is directly fitted (b in the figure), and this hexagon nut-shaped locking member (17) is attached using an electric drill (34) having an attachment (35) fitted into the hexagon nut-shaped locking member (17). To form a male thread (16) (FIG. 3c), and at the same time, a female thread (1).
A locking member (17) having 8) was screwed to the male thread portion (16) of the projection (15) (d in the figure).

Therefore, according to the second embodiment, each projection (1
Since the formation of the male screw portion (16) on the 5) and the attachment of the locking member (17) having the female screw portion (18) can be performed at the same time, the workability was excellent.

Using the repair lining material (10), repair of the existing manhole (1) in the sewer system was carried out in the same manner, and the same result as in the case of Example 1 was obtained.

Embodiment 3 In this third embodiment, the lining material (1
Using (0), the existing manhole (1) of the sewer was repaired in the same manner as in the first embodiment. Here, the difference from the first embodiment is that each projection of the peripheral wall (14) of the lining material main body (11) is different.
(15) is that an annular locking member (25) having a flange (26) is attached without providing the external thread (16).

That is, as shown in FIGS. 11 and 12,
Each protrusion (15) of the lining material main body (11), the collar (26) at the tip
And an annular locking member (25) made of a synthetic resin or a steel material having chemical resistance, heat resistance and rust resistance, and protrudes outward from the tip of each annular locking member (25). A heater (not shown) is pressed against the outer end of the projection (15). The heater is partially heated, and the tip is thermally deformed so as to protrude outward. A retaining projection (15a) associated with the projection was formed, and an annular locking member (25) was attached to each projection (15). The projected area of the annular locking member (25) having the flange (26) attached to the tip of each projection (15) was 5.5 cm ² .

Then, the repair of the existing manhole (1) of the sewer was carried out in the same manner using the repair lining material (10), and the same result as in the case of Example 1 was obtained.

Comparative Example 1 Next, the lining material main body (1) shown in FIG.
A heater (not shown) is pressed against the tip of each projection (15) in 1) by a conventional method. The heater is partially heated, and the tip is deformed so as to protrude outward. An overhang for locking was formed at the bottom. The temperature of the heater is 145 ° C,
The locking projection at the tip of each projection (15) was about 1.5 times (average value) the base diameter of the projection (15) before deformation. The number of protrusions (15) of the lining material (10) was the same as in the case of Example 1.

Evaluation Test Next, for each lining material (10) of Examples 1 and 2, using a pulling load tester (40) shown in FIG.
The pull-out load of the projection (15) with the locking member (17) of each lining material (10) and its variation were determined.

That is, for convenience, a part of the peripheral wall (14) of each lining material (10) of the first and second embodiments is cut out to be a sample, and the peripheral wall (14) is provided with a projection (15) with a locking member (17). )), A filler made of the same emulsion-type polymer cement paste (so-called cement milk) as in Example 1 is poured in, and this is cured.
A filler block (42) was formed. The filler block
At the top of (42), a nut (43) for connecting a cylinder rod,
Arranged so as to face the projection (15) with the locking member (17),
Embedded as well.

Next, the hydraulic cylinder (4) of the pulling load tester (40) is connected to the connecting nut (43) of the filler block (42).
After connecting the tip of the rod (45) of 4), the hydraulic cylinder (4
The required hydraulic pressure is sent from the hydraulic device (46) through the hose (47) to the rod (4), and the rod (45) is pulled up.
The filler block (42) in which 3) is embedded is pulled up, the pull-out load of the protrusion (15) with the locking member (17) is determined five times, and the degree of the variation is calculated. Are shown in Table 1 below.

Further, the lining material (10) having the projection (15) having the annular locking member (25) with the flange portion (26) according to the third embodiment.
Similarly, the pull-out load was determined using the pull-out load tester (40) shown in FIG. 7 and the degree of variation was calculated. The obtained results were also shown in Table 1 below. .

Further, with respect to the lining material of Comparative Example 1, the pull-out load of the protrusion with the overhanging portion and the variation thereof were determined in the same manner as in the above case, and the obtained results are shown in Table 1 below. Was.

[0063]

[Table 1] As can be seen from the results in Table 1, as in Example 1,
Using the electric die (30), the protrusion of the lining material main body (11)
After forming the male screw part (16) at the tip of (15), when the hexagon nut type locking member (17) is screwed and attached,
Compared to the case of Comparative Example 1, the drawing load was 1.64 times.

As in the second embodiment, the electric drill (34) is used to attach the tip of the projection (15) of the lining material main body (11) to the tip.
When the hexagon nut type locking member (17) having the female screw portion (18) was directly screwed and attached, the pulling load was 2.44 times as large as that of Comparative Example 1.

Further, as in the third embodiment, each of the projections (15) on the peripheral wall (14) of the lining material main body (11) does not have the male screw portion (16), and has an annular locking portion having a flange portion (26). When the member (25) was attached, the pulling load was 2.06 times as large as that of Comparative Example 1.

Therefore, in Example 1, in order to obtain the same pull-out strength as in Comparative Example 1, the number of the projections (15) with the locking members (17) is only about 2/3, and The time required for the screwing operation of (17) is about 2/3 of that in Comparative Example 1.

Specifically, in the first embodiment, the locking member (1) per 25 cm ² of the peripheral wall (14) of the lining material (10) is used.
7) The strength when one protrusion (15) is provided is 1 in Comparative Example 1 per 16 cm ^{2 of the} peripheral wall of the lining material.
In order to obtain the same strength as that of Comparative Example 1 in Example 1,
The number of projections (15) with locking members (17) can be extremely small.

In the second embodiment, in order to obtain the same pull-out strength as that of the first comparative example, the protrusion (1) with the locking member (17) is required.
The number of 5) is about 2/5, and in particular, in Example 2
Then, using the electric drill (34), the lining material mainly (11)
Since the hexagonal nut-type locking member (17) is directly screwed to the tip of the projection (15), the time required for screwing the locking member (17) can be further reduced, and the comparative example It is clear that about 1/4 is required compared to 1.

In the third embodiment, in order to obtain the same pull-out strength as in the first comparative example, the protrusion with the locking member (25) is required.
The number of (15) is about 2/3 and 1/2, and the locking member (2
The time required for the mounting work of 5) is also about 1 time as compared with Comparative Example 1.
/ 2 is enough.

Further, in the first to third embodiments, the locking member (17)
(25) The variation in the pull-out load of the projection (15) is very small, while in Comparative Example 1, the variation in the pull-out load of the projection with the overhang formed by thermal deformation is large, and therefore the lining material In consideration of safety, the number of protrusions of the lining material was determined in the design of Comparative Example 1 in consideration of safety.
Therefore, it is necessary to considerably increase the work time, and accordingly, the working time of the thermal deformation processing of the protrusions is long.

[0071]

As described above, according to the present invention, the lining material for repairing existing manholes of the sewerage system of the first invention has a required number of protrusions on the peripheral wall mainly composed of a cylindrical repair lining material made of synthetic resin. A male screw portion is provided on a peripheral surface of each projection, and a locking member having a female thread portion is screwed and attached to the male screw portion of each projection. The lining material for repairing human holes is provided with a required number of projections on the peripheral wall mainly composed of the tubular lining material for repairing, and each projection is fitted with an annular locking member having a flange at the tip and made of a heat-resistant material. The outer end of the projection that is covered and protrudes outward from the distal end of each annular locking member is deformed by heat to form a retaining projection that engages with the distal end of the annular locking member. , In any case, a member separate from the projection mainly composed of the lining material Since each of the locking members is attached to each other, the shape and size of the locking portions provided on each projection mainly composed of the lining material are all constant, whereby the pull-out strength of the projection with the locking member is extremely high. It is possible to reliably perform the anchoring action without causing variation in the strength surface, and after the curing of the filler consisting of the polymer cement paste injected into the back of the lining material, it is sufficient for the load of the filler itself Can withstand. Therefore, it is possible to reliably prevent partial bulging of the lining material peripheral wall due to the action of external pressure such as groundwater in the repaired human hole, and to reliably repair the existing human hole, thereby improving durability. Can increase significantly.

Moreover, since the pull-out strength of the projection with the locking member is very high, the number of the projections with the locking member as the whole lining material can be reduced, and the mounting of the locking member can be performed with good workability. Since it can be performed in a short time, there is an effect that the production efficiency of the lining material can be improved.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of an upper and lower lining material divided body used for manufacturing an existing human hole repair lining material of the present invention.

FIG. 2 is a partially cutaway front view mainly of a lining material manufactured by combining upper and lower lining material divided bodies, showing a state in which a locking member is not attached to a projection.

FIG. 3 is a front view of the lining material of the present invention, showing a state in which a locking member is attached to each projection.

FIG. 4 is an enlarged perspective view of a hexagonal nut-type locking member attached to the lining material of the present invention.

FIG. 5 is a view for sequentially explaining a step of attaching a locking member to a projection of the peripheral wall of the lining material main body of FIG. 2;
Fig. 5b is an enlarged front view of a projection on the lining material main peripheral wall,
FIG. 5C is an enlarged front view of a partially cut-out state in which a male screw portion is formed at the tip of the projection using an electric die, and FIG. .

FIG. 6 is a sectional view of a human hole after being repaired with the lining material of the present invention.

FIG. 7 is an enlarged partial cutaway front view of the lining material according to the present invention, in which a pull-out load of each projection with a locking member is determined using a pull-out load tester.

FIG. 8 is a view for explaining another method of attaching the locking member to the projection of the peripheral wall of the lining material in FIG. 2 in the order of steps, and FIG. 8A is an enlarged front view of the projection of the peripheral wall of the lining material. FIG. 8B is an enlarged front view in which a hexagonal nut-shaped locking member is fitted over the distal end of the projection, and shows a state before a male screw portion is formed. FIG. 8C is an enlarged front view of a partially cut-out state in which a hexagon nut-shaped locking member is rotated by using an electric drill to form a male screw portion at the tip of the projection, FIG.
FIG. 4 is an enlarged front view of a state in which a hexagonal nut-type locking member is attached to a projection.

FIG. 9 is an enlarged perspective view of a circular nut-shaped locking member attached to the lining material of the present invention.

FIG. 10 is an enlarged perspective view of a cap nut-shaped locking member having a circular flange attached to the lining material of the present invention.

FIG. 11 is an enlarged perspective view of a cap nut-shaped locking member having a hexagonal head attached to the lining material of the present invention.

FIG. 12 is an enlarged perspective view of a main part in a state where an annular locking member having a flange at the tip is fitted over a projection on the lining material main peripheral wall.

FIG. 13 is an enlarged perspective view of a main part in a state in which an outer end of a protrusion protruding outward from a distal end of the annular locking member is deformed by heat to form a retaining protrusion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Existing human hole 10 Lining material 11 Lining material main body 12 Bottom wall 13 Top wall 14 Peripheral wall 15 Projection 15a Retaining protrusion 16 Male screw part 17 Locking member 18 Female screw part 25 Ring locking member 26 Flange

Claims (2)

(57) [Claims] 1. A bottom wall (12) and an upper wall (13) having a shape covering an inner wall of an existing manhole (1) in a sewer with a required gap.
Repair-type cylindrical lining material made of synthetic resin with
The required number of projections (15) is provided on the peripheral wall (14) of 1), and each projection
A male screw part (16) is provided on the peripheral surface of (15), and a locking member (17) having a female screw part (18) is screwed and attached to the male screw part (16) of each projection (15). , Lining material for repairing existing manholes in sewers. 2. A bottom wall (12) and an upper wall (13) having a shape covering an inner wall of an existing human hole (1) in a sewer with a required gap.
Repair-type cylindrical lining material made of synthetic resin with
The required number of projections (15) is provided on the peripheral wall (14) of 1), and each projection
(15), an annular locking member (25) having a flange (26) at the tip and made of a heat-resistant material is fitted and covered, and a projection ( A lining material for repairing existing manholes in sewers, wherein the outer end of (15) is deformed by heat to form a retaining projection (15a) that engages with the tip of the annular locking member (25).