JP7412275B2 - Rehabilitation pipe floating prevention device - Google Patents

Description

The present invention relates to a device for preventing floating of a rehabilitated pipe when backfilling material is filled between an existing pipe and the rehabilitated pipe lined inside the existing pipe.

It is well known that in order to rehabilitate aging existing pipes such as sewer pipes buried underground, it is necessary to line the rehabilitated pipes inside the existing pipes and fill the gap between the rehabilitated pipes and the existing pipes with a backfilling material. It is being Various devices have been developed to prevent the rehabilitated pipe from floating or deforming due to the buoyant force acting on the rehabilitated pipe or the injection pressure of the backfilling material during filling with backfilling material.

The floating prevention device disclosed in Patent Document 1 includes a support with a jack portion extending linearly, and a bottom raising member. The bottom raising member extends inside the rehabilitation pipe along the bottom of the rehabilitation pipe. The shoring is arranged at intervals in the axial direction of the rehabilitation pipe, stands vertically from the bottom raising member, penetrates the top of the rehabilitation pipe, and has its upper end abutted against the top of the existing pipe. In this way, by fixing the bottom of the rehabilitated pipe with the shoring and the bottom raising member, it is possible to prevent the rehabilitated pipe from floating up during filling with backfilling material.

The floating prevention device disclosed in Patent Document 2 includes an expansion body disposed between the tops of an existing pipe and a rehabilitated pipe. By expanding this expansion body, the top of the rehabilitated pipe is pressed down, and the bottom of the rehabilitated pipe is further pressed against the bottom of the existing pipe. In this way, the rehabilitation pipe is prevented from floating when being filled with backfilling material.

The flotation prevention device disclosed in Patent Document 3 includes an arc-shaped support member disposed in the gap between the upper chord portions of the existing pipe and the rehabilitated pipe. The support members have an angular range of more than a semicircle and are arranged at intervals in the tube axis direction. This support member is intended to prevent floating and deformation of the rehabilitated pipe during filling with backfilling material.
The flotation prevention device disclosed in Patent Document 4 is equipped with a support member having an arc-shaped cross section in the gap between the upper chord of the existing pipe and the rehabilitated pipe, and this support member prevents the flotation of the rehabilitated pipe during filling with backfilling material. is prevented. This support member is arranged continuously in the tube axis direction.

JP 2019-183632 Publication Japanese Patent Application Publication No. 2014-109361 Patent No. 6170556 Japanese Patent Application Publication No. 7-100925

In the device of Patent Document 1, a through hole must be formed in the rehabilitated pipe. Furthermore, the cross-sectional shape of the rehabilitated pipe tends to deform into an elliptical shape with vertical collapse due to the injection pressure of the backfilling material.
In the device of Patent Document 2, the cross-sectional shape of the rehabilitation pipe may be deformed into an elliptical shape collapsed in the vertical direction due to the pressing force of the expansion body. Furthermore, since the rehabilitated pipe is not supported from the inside, there is a possibility that the deformation will progress further due to the injection pressure of the backfilling material. Furthermore, when filling with backfilling material, the rehabilitated pipe tends to rotate about the expanding body located at the top of the pipe as a fulcrum, making support of the rehabilitated pipe unstable.

In the device of Patent Document 3, the deformation and floating amount are different between the region where the arc-shaped support member is arranged and the region where it is not arranged, and unevenness may occur on the inner surface of the rehabilitated tube. Further, since a support member having an arc shape with a wide angle range is required, the cost is high.
In the device of Patent Document 4, the support member only plays the role of preventing the rehabilitated pipe from floating, and does not support the rehabilitated pipe from the inside, so the cross-sectional shape of the rehabilitated pipe changes due to the injection pressure and buoyancy of the backfilling material. May be deformed. Furthermore, since the specially shaped arc-shaped members are arranged continuously in the tube axis direction, the cost is high.

In order to solve the above problems, the present invention provides an apparatus for preventing floating of the rehabilitated pipe when filling a backfilling material between an existing pipe and the rehabilitated pipe lined inside the existing pipe.
at least a pair of support members disposed in a gap between the upper chord part of the existing pipe and the upper chord part of the rehabilitated pipe, spaced apart in different directions from the pipe tops of the existing pipe and the rehabilitated pipe, and extending in the pipe axial direction; A bottom raising member extending along the bottom of the rehabilitated pipe inside the rehabilitated pipe, and shoring arranged at intervals in the axial direction of the rehabilitated pipe, the shoring comprising: It is characterized in that it has a jack part, stands vertically from the bottom raising member, and has an upper end that presses the top of the rehabilitated pipe.

According to the above configuration, at least one pair of support members can prevent the rehabilitated pipe from floating when backfilling material is filled. Furthermore, since these support members are spaced apart from the top of the rehabilitated pipe in different directions, the rehabilitated pipe can stably support the rehabilitated pipe without rotating around the top of the pipe as a fulcrum. In addition, deformation of the rehabilitated pipe can be suppressed in the axial direction by the shoring and the bottom raising member arranged inside the rehabilitated pipe. Furthermore, there is no need to make holes in the rehabilitated pipe, and the structure of the device is simple and low cost.

Preferably, the support member is fixed to the inner surface of the existing pipe. According to this configuration, the support member can be reliably placed at a desired position.
In a specific embodiment, the support member is made of deformed reinforcing bars. According to this configuration, integrity and adhesion with the backfilling material made of cement milk, mortar, etc. can be ensured.
In another specific embodiment, the support member includes an elongated bag-like net and a filler filled in the net. According to this configuration, it is possible to install the net on the existing pipe before lining the rehabilitated pipe and fill the net with filler after lining, so that the support member does not get in the way during lining.

Preferably, the apparatus further includes a top raising member extending along the top of the rehabilitation pipe, and the upper end of the shoring presses the top of the rehabilitation pipe via the top raising member.
According to the above configuration, the buckling strength of the rehabilitated pipe can be increased in the pipe axis direction by the cooperation of the bottom raising member, the top raising member, and the support.

According to the flotation prevention device of the present invention, while having a simple structure and low cost, it is possible to stably support a rehabilitated pipe during filling with backfill material, and prevent flotation and deformation of the rehabilitated pipe. be able to.

BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal cross-sectional view which shows the floating prevention device based on 1st Embodiment of this invention, together with an existing pipe and a rehabilitated pipe. FIG. 2 is a cross-sectional view of the floating prevention device taken along line II-II in FIG. 1. FIG. FIG. 3 is an enlarged cross-sectional view showing a structure for fixing a support member of the flotation prevention device to an existing pipe. FIG. 7 is an enlarged vertical cross-sectional view of a main part showing a modification of the structure for fixing the support member to the existing pipe. (A) to (C) are views corresponding to FIG. 2 that sequentially show the installation process of the floating prevention device according to the second embodiment of the present invention. It is a perspective view which shows the net of the support member used in the floating prevention device of the same 2nd Embodiment.

A first embodiment of the present invention will be described below with reference to FIGS. 1 to 3.
Reference numeral 1 in FIG. 1 indicates an existing pipe such as a sewer pipe buried underground. In order to rehabilitate the aged existing pipe 1, a rehabilitated pipe 2 is lined inside the existing pipe 1, and a backfilling material such as cement milk or mortar is filled between the existing pipe 1 and the rehabilitated pipe 2.

As shown in FIGS. 1 and 2, prior to filling with backfilling material, a floating prevention device 3 is placed to prevent the rehabilitated pipe 2 from floating or being deformed. The floating prevention device 3 includes a pair of support members 10, two upper and lower raising members 15 and 16, and a support 20.

The installation process of the floating prevention device 3 will be explained below.
Before the lining process of the rehabilitated pipe 2, a pair of support members 10 extending in the axial direction of the existing pipe 1 are fixed to the inner surface of the upper chord part of the existing pipe 1. As shown in FIG. 2, the pair of support members 10 are spaced from the pipe top of the existing pipe 1 by the same distance in the left and right directions when viewed from the pipe axis direction of the existing pipe 1. When described in terms of angles centered on the pipe axis of the existing pipe 1, if the top of the tube is 0°, and clockwise from the top is + and counterclockwise is -, one support member 10 is +Θ and the other support Member 10 is in an angular position of -Θ. Θ is preferably in the range of 5 to 45°. This is to counter the buoyant force that acts on the rehabilitated pipe 2 during filling with backfilling material, which will be described later. In this embodiment, Θ = 10°, but if Θ is made as close as possible to 45° (for example, Θ = 40 to 45°), when earth pressure is applied to the existing pipe 1 after rehabilitation, the support The stress generated at the contact point with the member 10 can be reduced, and the risk of cracks in the existing pipe 1 starting from the support member 10 can be reduced.

In order to ensure integrity with the backfill material made of cement milk or mortar, it is preferable to use an iron or cement-based member as the support member 10. Further, in order to prevent separation of the interface between the support member 10 and the backfilling material when an external force is applied and ensure adhesion, the support member 10 preferably has an uneven surface. In this embodiment, deformed reinforcing bars are used.

The support member 10 extends in the axial direction of the existing pipe 1. The support members 10 may be continuous over the entire length of the existing pipe 1, but it is also possible to arrange a plurality of support members 10 along the axial direction of the existing pipe 1 and wrap the ends thereof. good. Further, the plurality of support members 10 may not overlap and may be separated in the tube axis direction, for example, as long as they are within 200 to 300 mm.

As shown in FIG. 3, the support members 10 are fixed to the inner surface of the existing pipe 1 by fixing structures 11 at intervals in the tube axis direction. The fixing structure 11 includes an anchor bolt 12 embedded in the existing pipe 1, a support fitting 13, and a nut 14. The support fitting 13 has a fixing plate part 13a and a support plate part 13b which is connected to the fixing plate part 13a and has an arc shape. The support fitting 13 is fixed to the existing pipe 1 by screwing and tightening a nut 14 onto an anchor bolt 12 passing through the fixing plate part 13a, with the support member 10 supported on the support plate part 13b.

If the inner surface of the existing pipe 1 has collapsed, especially if the area facing the support member 10 has collapsed, it is preferable to repair it with a cement-based material before or after installing the support member 10. Thereby, when buoyancy acts on the rehabilitated pipe 2 in the backfilling material filling process, a reaction force can be reliably obtained.

After the support member 10 is installed, the rehabilitated pipe 2 is lined inside the existing pipe 1. There are various methods for this lining. For example, the rehabilitated pipe 2 may be formed by enlarging the diameter of a long cylinder, or it may be formed by spirally winding a band-shaped member and fitting the side edges of adjacent wound parts. .

As a result of lining the rehabilitated pipe 2, two support members 10 are disposed between the existing pipe 1 and the rehabilitated pipe 2. When the rehabilitated pipe 2 is formed from a band-shaped member as described above, it is preferable that the main portion of the band-shaped member is higher than the fitting portion on the side edge of the band-shaped member. Thereby, the main portion of the band-like member of the lined rehabilitated pipe 2 can be brought into a state in which it is substantially in contact with the support member 10. Note that the support member 10 does not necessarily need to be in contact with the existing pipe 1 and the rehabilitated pipe 2, and a gap may be formed as long as it is within a permissible range.

Next, after lining the rehabilitated pipe 2, the raising members 15 and 16 and the shoring 20 are installed inside the rehabilitated pipe 2. A plurality of shoring structures 20 are arranged along the pipe axis of the rehabilitation pipe 2 at intervals. The shoring 20 includes a strut member 21 made of a straight pipe, a U-shaped upper base portion 22 fixed to the upper end of the strut member 21, a U-shaped lower base portion 23, a strut member 21, and a lower U-shaped base portion 22. The jack part 24 is interposed between the base part 23 and the jack part 24 . The jack part 24 includes a threaded rod 24a that is fixed to the lower base part 23, projects vertically upward, and is inserted into the lower end of the tension member 21, and a handle that is screwed onto the threaded rod 24a and touches the lower end surface of the tension member 21. It has an elevating member 24b with an attached elevating member 24b. The entire length of the shoring 20 can be extended by rotating the lifting member 24b to widen the distance between the strut member 21 and the lower base portion 23. Note that the jack portion 24 may be arranged between the tension member 21 and the upper base portion 22.

The bottom raising member 16 is arranged at the bottom of the rehabilitation pipe 2 and extends continuously over the entire length of the rehabilitation pipe 2. The bottom raising member 16 is divided into predetermined lengths, and the ends of the bottom raising members 16 adjacent in the tube axis direction are joined together. It is preferable that these end portions form concave and convex portions of complementary shapes and are joined in a fitted state. This can prevent them from shifting laterally. The bottom raising member 16 is made of aluminum and is hollow, so it is lightweight and easy to install.

The shoring 20 stands vertically from the bottom raising member 16. The shoring 20 is arranged so as to fit the end of the bottom raising member 16 adjacent to the U-shaped lower base portion 23 and rest on the joint portion thereof. Thereby, the installation position of the shoring 20 can be determined accurately.

The top raising member 15 has the same configuration as the bottom raising member 16, is arranged at the top of the rehabilitation pipe 2, and extends continuously along the pipe axis of the rehabilitation pipe 2. The upper base part 22 of the shoring 20 is arranged at the joint part of the adjacent top raising members 15 in the same manner as the lower base part 23.

The shoring 20 is extended by the jack part 24, and the base parts 22 and 23 press against the top and bottom of the rehabilitation pipe 2 through the upper and lower raising members 15 and 16, so that the shoring 20 is stretched vertically in a taut state. maintained.

After installing the raising members 15 and 16 and the shoring 20 as described above, the gap between the existing pipe 1 and the rehabilitated pipe 2 is filled with backfilling material. In this backfilling process, buoyancy acts on the rehabilitated pipe 2, but the pair of support members 10 extending in the pipe axis direction prevents the upward displacement of the pipe top of the rehabilitated pipe 2 in the longitudinal direction. It can be prevented for a long time. In addition, since the shoring 20 holds down the bottom of the rehabilitated pipe 2 via the bottom raising member 16 extending in the pipe axis direction, upward displacement of the bottom of the rehabilitated pipe 2 is prevented in the longitudinal direction of the rehabilitated pipe 2. It can be prevented for a long time.

As described above, floating of the rehabilitated pipe 2 can be prevented. Moreover, since the pair of support members 10 are arranged apart from each other in different directions from the top of the pipe 1, it is possible to prevent the rehabilitated pipe 2 from rotating around the top of the pipe as a fulcrum due to buoyancy, thereby making it stable. The rehabilitated pipe 2 can be supported.

A force that compresses the rehabilitated pipe 2 vertically due to the buoyancy and injection pressure of the backfill material acts on the rehabilitated pipe 2, but this force can be absorbed by the supports 20 placed at intervals, and the rehabilitated pipe 2 deformation and buckling can be prevented. Moreover, the shoring 20 receives the vertical force acting on the rehabilitated pipe 2 via the upper and lower raising members 15 and 16 extending in the pipe axis direction, thereby preventing deformation of the rehabilitated pipe 2 in the pipe axis direction. It is possible to improve buckling resistance.

In the above embodiment, when the outermost periphery of the rehabilitated pipe 2 is made of a reinforcing member such as iron, the supporting member 10 and the supporting metal fittings 13 are coated with vinyl chloride resin, epoxy resin, etc. from the viewpoint of preventing electrolytic corrosion. It is preferable that

FIG. 4 shows a modification of the fixing structure of the support member 10 made of deformed reinforcing bars. Note that the arrangement of the support member 10 is the same as in the above embodiment. The fixed structure 11A includes a plurality of concrete screws 18 driven into the existing pipe 1 at intervals along the support member 10, and a binding wire 19.
The concrete screw 18 is driven next to the support member 10, that is, adjacent to the support member 10 in the circumferential direction. The amount of protrusion of the concrete screw 18 from the inner surface of the existing pipe 1 is less than the protrusion height of the supporting member 10 from the inner surface of the existing pipe 1.

After driving the concrete screws 18, the supporting member 10 is tied to the concrete screws 18 using a binding wire 19. In addition, in FIG. 4, the shape of the binding line 19 is simplified and shown as a broken line.
Note that when the outermost periphery of the rehabilitated pipe 2 is made of a reinforcing member such as iron, not only the support member 10 but also the binding wire 19 are coated with vinyl chloride resin, epoxy resin, etc. from the viewpoint of preventing electrolytic corrosion. It is preferable that

Next, a second embodiment of the present invention will be described with reference to FIGS. 5 and 6. The flotation prevention device 3A of this embodiment uses a support member 30 different from the support member 10 of the flotation prevention device 3 of the first embodiment, but the other configuration is the same as that of the first embodiment, so the same number is used in the drawings. The detailed explanation will be omitted.

The support member 30 of this embodiment includes a net body 31 shown in FIG. This mesh body 31 is made of a plain weave wire mesh having a long cylindrical shape. One end 31a of this net 31 is closed, and the other end 31b is open. The length of the mesh body 31 is limited to a predetermined length, for example, 10 m, and is shorter than the general existing pipe 1 so that the injection pressure of the aggregate-containing cement material 32 described later does not become too high.

In the first step, before lining the rehabilitated pipe 2 , as shown in FIG. The mesh bodies 31 are fixed at intervals in the tube axis direction. This fixing structure consists of, for example, an anchor bolt, a support fitting, and a nut.

In the second step, the rehabilitated pipe 2 is lined by 10 m.
In the third step, as shown in FIG. 5(B), an aggregate-containing cement material 32 (filler) is filled from the open end 31b of the net body 31. As a result, the mesh body 31 swells and presses a portion of the rehabilitated pipe 2 at a predetermined angle away from the top of the pipe from the outside of the rehabilitated pipe 2. When the injected cement material 32 reaches the sealed end 1a, the open end 1a is closed. Note that the number of meshes of the net body 31 is set to such an extent that the aggregate of the cement material 32 does not pass through.

The above first to third steps are repeated over the entire length of the existing pipe 1. Note that after the plurality of mesh bodies 31 are fixed to the existing pipe 1 over the entire length of the existing pipe 1 (that is, after the first step is completed), the second and third steps may be repeated.

Next, as shown in FIG. 5(C), the raising members 15 and 16 and the shoring 20 are installed inside the rehabilitation pipe 2.

The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit thereof.
The top raising member may be omitted.
A plurality of pairs of support members may be arranged between the upper chord part of the existing pipe and the upper chord part of the rehabilitated pipe.

The present invention can be applied to the rehabilitation of underground sewer pipes, etc.

1 Existing pipe 2 Rehabilitation pipe 3, 3A Anti-surfacing device 10 Support member 15 Top raising member 16 Bottom raising member 20 Shoring 21 Tension member 22 Upper base part 23 Lower base part 24 Jack part 30 Support member 31 Net Body 32 Cement material containing aggregate (filling material)

Claims (4)

In an apparatus for preventing floating of the rehabilitated pipe when filling a backfilling material between the existing pipe and the rehabilitated pipe lined inside the existing pipe,
at least a pair of support members disposed in a gap between the upper chord part of the existing pipe and the upper chord part of the rehabilitated pipe, spaced apart in different directions from the pipe tops of the existing pipe and the rehabilitated pipe, and extending in the pipe axial direction;
a bottom raising member extending along the bottom of the rehabilitated pipe inside the rehabilitated pipe;
a top raising member extending along the top of the rehabilitated pipe inside the rehabilitated pipe;
shoring arranged at intervals in the axial direction of the rehabilitated pipe;
Equipped with
The rehabilitation pipe is characterized in that the shoring has a jack part, stands vertically from the bottom raising member, and has an upper end pressing down on the top of the rehabilitated pipe via the top raising member. Anti-surfacing device. The rehabilitation pipe floating prevention device according to claim 1, wherein the support member is fixed to an inner surface of the existing pipe. The rehabilitation pipe floating prevention device according to claim 1 or 2, wherein the support member is made of deformed reinforcing bars. 3. The rehabilitation pipe floating prevention device according to claim 1, wherein the support member includes an elongated bag-like net and a filler filled in the net.

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