JP2021055807A - Spacer for pipe rehabilitation - Google Patents

Abstract

To provide a spacer for pipe rehabilitation that is easy to arrange and can stably hold a rehabilitation pipe.SOLUTION: A spacer 1 for pipe rehabilitation comprises: a plurality of height formation leg parts 2 that is provided at intervals in a circumferential direction around the axial line of an existing pipe P1, and is formed by a rod member 4 running along a longitudinal direction in the extending direction of the existing pipe P1; and a mounting member 3 of a rehabilitation pipe P2 fixed between the plurality of height formation leg parts 2, 2. It is preferable that the plurality of height formation leg parts 2 is arranged in an odd number of three or more at intervals in the circumferential direction.SELECTED DRAWING: Figure 3

Description

The present invention relates to a spacer for tube rehabilitation.

When arranging a rehabilitation pipe in an existing pipe buried in the ground and rehabilitating the pipe, it may be necessary to align the axis of the rehabilitation pipe with the axis of the existing pipe. For example, when the existing pipe is a pressure pipe for agricultural or industrial water use, it is necessary to consider the internal water pressure, or even if it is a non-pressure pipe, it is necessary to consider the load bearing capacity or seismic resistance after rehabilitation. .. Alternatively, as a case different from the above, when the rehabilitation pipe installed in the existing pipe must be sloped, it may be necessary to adjust the height of the axis of the rehabilitation pipe different from the axis of the existing pipe.

In the above cases, conventionally, a substantially cubic block made of a thick (height) piece of wood or the like has been used as a spacer on the bottom of an existing pipe or the like. A plurality of these blocks were arranged on the outer peripheral surface of the rehabilitation pipe and / or in the direction in which the rehabilitation pipe was extended.

However, since the conventional spacer is a substantially cubic block in which the upper surface is a mounting portion and the height is provided by the thickness, positioning of the spacers when arranging them in advance is troublesome and easily moves, so that the rehabilitation tube is used. The stability of the installation was poor.
Therefore, the present invention provides a tube rehabilitation spacer that is easy to arrange and can stably hold the rehabilitated tube.

A plurality of spacers for pipe rehabilitation of the present invention are provided at intervals in the circumferential direction about the axis of the existing pipe, and height-forming legs formed by rod members along the longitudinal direction in the extension direction of the existing pipe. A portion and a mounting member for a rehabilitation tube fixed between the plurality of height-forming legs are provided.
According to this configuration, the plurality of height-forming legs prevent the existing pipe from shifting in the extending direction and the circumferential direction around the axis, and the pipe rehabilitation spacer is firmly placed below the rehabilitation pipe. can do. Further, since the pipe rehabilitation spacer has a configuration having a plurality of height-forming legs and mounting members, positioning is easy.

The plurality of height-forming legs of the tube rehabilitation spacer of the present invention may be arranged in an odd number of three or more at intervals in the circumferential direction.
According to this configuration, by placing the central height-forming leg approximately in the center of the bottom of the existing pipe, the center of gravity of the rehabilitated pipe is received by the central height-forming leg, and the rehabilitated pipe is balanced as a whole. I can support it.

The rod members constituting the plurality of height-forming legs of the pipe rehabilitation spacer of the present invention may be deformed reinforcing bars.
According to this configuration, it is easy to prevent the space filled with the backfill material from being unnecessarily narrowed by the member forming the height, and the height forming leg is not treated as a foreign substance to the RC structure and is RC. Considered part of the structure.

The plurality of height-forming legs of the tube rehabilitation spacer of the present invention may be provided with heights by overlapping the peripheral surfaces of the plurality of rod members.
According to this configuration, for example, by using a substantially columnar rod member, it is possible to provide the height of the pipe rehabilitation spacer with as small a volume as possible without increasing the cross-sectional area of the rod member.

A plurality of the plurality of rod members in which the peripheral surfaces of the present invention are overlapped may be fixed in a straight line at intervals in the extending direction of the existing pipe.
According to this configuration, the backfilling material can be inserted between the rod members arranged on the same line, and the backfilling material can be quickly distributed below the pipe rehabilitation spacer.

A plurality of the previously described members of the spacer for tube rehabilitation of the present invention may be arranged at intervals in the longitudinal direction of the height-forming legs.
According to this configuration, one tube rehabilitation spacer makes it possible to hold the rehabilitated tube more stably.

The previously described member of the spacer for pipe rehabilitation of the present invention may be formed of a plate material such as a deformable cold-rolled steel plate.
According to this configuration, the mounting member can be easily deformed at the site by a human hand or by using a simple tool according to the shape of the inner peripheral surface of the existing pipe or the outer peripheral surface of the rehabilitation pipe.

The height-forming legs and the above-mentioned mounting members of the pipe rehabilitation spacer of the present invention are preferably made of steel. Specifically, for example, the height-forming legs are preferably round bars for reinforced concrete or deformed reinforcing bars, and the mounting members are preferably made of steel materials such as hot-dip galvanized steel plates or cold-rolled steel plates.
According to this configuration, the pipe rehabilitation spacer can be a part of the RC structure without being treated as a foreign substance for the RC structure.

The method for rehabilitating an existing pipe of the present invention includes a spacer installation step of arranging the pipe rehabilitation spacer according to any one of the above at a predetermined pitch in the existing pipe, and a rehabilitation pipe on a mounting member of the pipe rehabilitation spacer. It has a rehabilitation pipe installation step of installing the backfilling material and a backfilling material injection step of injecting a backfilling material between the existing pipe and the rehabilitation pipe.
According to this configuration, any of the above effects can be exerted, and the existing pipe can be easily and quickly rehabilitated.

The spacer for tube rehabilitation of the present invention has an effect that it is easy to arrange and can stably hold the rehabilitated tube.

(A) A front view showing a spacer for pipe rehabilitation according to an embodiment of the present invention, (b) the same plan view, and (c) the same side view. It is a figure which showed the installation state of the spacer for pipe rehabilitation of one Embodiment of this invention cut in the direction orthogonal to the axis of the existing pipe. The state in which the pipe rehabilitation spacer according to the embodiment of the present invention is installed so that the axis of the rehabilitation pipe is aligned with the axis of the existing pipe is shown by cutting it in a vertical plane including the axis of the existing pipe. It is a sectional view. A cross section showing a state in which the pipe rehabilitation spacer of one embodiment of the present invention is installed and the rehabilitation pipe installed in the existing pipe is installed so as to have a gradient, cut in a vertical plane including the axis of the existing pipe. It is a figure. It is a figure which showed the installation state of another example of the spacer for pipe rehabilitation of one Embodiment of this invention cut in the direction orthogonal to the axis of the existing pipe. It is a side view which showed another example of the spacer for tube rehabilitation of one Embodiment of this invention.

Hereinafter, an embodiment of the spacer for tube rehabilitation of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 (a)-(c), the tube rehabilitation spacer 1 according to the embodiment of the present invention has a substantially rod-shaped height-forming leg 2 and a height-forming leg 2, 2 and 2. It is provided with a mounting member 3 which is fixed over.

The height-forming leg 2 is not necessarily limited, but is formed by a rod member 4 having a substantially circular cross section. The bar member 4 is preferably steel bar, and more preferably a deformed reinforcing bar containing round steel.
When the rod member 4 has a substantially circular cross section, the diameter of the height-forming leg 2 is not particularly limited, but is preferably 10 mm or more and 51 mm or less.

The length of the height forming leg 2 (that is, the length of the rod member 4 in the axial direction) is the size in the existing pipe P1 shown in FIG. 2 and the length in the axial direction of the rehabilitation pipe P2 installed in the existing pipe P1. , It can be set appropriately depending on the ease of transportation, etc., but it is preferable to set it to, for example, about 500 mm.

In order to provide the height by the height forming leg 2 as described above, a rod member 4 having a diameter corresponding to the desired height is used, or the peripheral surfaces 4a of the plurality of rod members 4 are overlapped and fixed. When a plurality of rod members 4 are stacked to obtain a height dimension, the diameter direction of each rod member 4 is set as shown in the solid line rod member 4 and the virtual line rod member 4 in FIG. 1 (a). If the peripheral surfaces 4a are overlapped on the same straight line, the height can be stably and efficiently obtained. Further, when the rod members 4, 4 are overlapped with each other, they may be fixed by any method as long as the rod members 4, 4 are not displaced from each other, but it is preferably fixed by welding.

The mounting member 3 is made of a steel plate. The type of the steel sheet is not particularly limited, but for example, a hot-dip galvanized steel sheet, a cold-rolled steel sheet, or the like can be used.
The size of the mounting member 3 can be appropriately set depending on the size in the existing pipe P1 shown in FIG. 2, the axial length of the rehabilitation pipe P2 installed in the existing pipe P1, the ease of transportation, and the like. For example, it may be set to about 500 mm × 500 mm.

The thickness of the mounting member 3 is not particularly limited, but is preferably 0.25 mm or more and 3.2 mm or less, for example. If the thickness of the mounting member 3 is as large as the above, the mounting member 3 can be deformed by human hand or by using a simple tool according to the shape of the existing pipe P1.

The tube rehabilitation spacer 1 can be produced as follows by using the height-forming leg 2 and the mounting member 3 having the above configuration.
As a whole, three sets of height-forming legs 2 having the same shape and dimensions are prepared, and two mounting members 3 having the same shape and dimensions are prepared. The height-forming leg 2 may be formed by using rod members 4 having different diameters as long as they can form the same shape and the same dimensions as a whole.

As shown in FIGS. 1 (a) and 1 (b), three sets of height-forming legs 2 are arranged in parallel at substantially equal intervals, and height-forming legs are placed at both ends of the three sets of height-forming legs 2. The mounting member 3 is placed so as to be orthogonal to the portion 2. The mounting member 3 is placed with its surface laid down so that the plate surface 3a forming the eccentric plane faces the peripheral surface 4a of the rod member 4.

Then, the three sets of height-forming legs 2, 2, 2 and the two mounting members 3, 3 are welded at each intersection, and the height-forming legs 2 and the mounting members 3 are formed. Is firmly fixed at the intersection.
From the above, the spacer 1 for pipe rehabilitation is completed. Next, a method of using the tube rehabilitation spacer 1 will be described. The tube rehabilitation spacer 1 is arranged as follows.

[Spacer installation process]
The pipe rehabilitation spacer 1 is arranged directly on the existing pipe P1 before the rehabilitation pipe P2 is installed, after removing foreign matter by cleaning the inside of the existing pipe P1 or the like. Specifically, as shown in FIG. 2, among the three height-forming legs 2 of the pipe rehabilitation spacer 1, the central height-forming leg 2 is located at the lowest position of the bottom of the existing pipe P1. , The existing pipe P1 is arranged along the stretching direction (the paper surface depth direction in FIG. 2). The mounting members 3 extending on both sides of the central height-forming leg 2 are deformed so as to follow or be parallel to the shape of the existing pipe P1. As a result, the height-forming legs 2 on both sides are substantially in contact with the inner peripheral surface of the existing pipe P1.

In this way, the height-forming legs 2 are arranged substantially along the axis of the existing pipe P1, and the mounting member 3 is arranged substantially along the outer peripheral direction of the rehabilitation pipe P2.

The next pipe rehabilitation spacer 1 is sequentially arranged in the depth direction or the front direction in the direction in which the existing pipe P1 extends with respect to the already installed pipe rehabilitation spacer 1. Whether to arrange the spacer 1 in the front direction or the depth direction is determined according to the position where the pipe rehabilitation spacer 1 is started to be arranged at the rehabilitation portion of the existing pipe P1 or the type of the rehabilitation method of the existing pipe.

In the plurality of pipe rehabilitation spacers 1, the height forming legs 2 are directed in the extending direction of the existing pipe P1 (or the arrangement direction of the rehabilitation pipe P2), and the mounting members 3 are spaced apart in the extending direction of the rehabilitation pipe P2. Arrange them while opening a predetermined pitch so that they can be arranged substantially in parallel.

The pipe rehabilitation spacer 1 is selected with an appropriate height in consideration of the installation height or gradient of the rehabilitation pipe P2. Specifically, when the axis of the rehabilitation pipe P2 to be installed with the height of the existing pipe P1 being substantially constant is aligned with the axis of the existing pipe P1, a constant height dimension is used as shown in FIG. A pipe rehabilitation spacer 1 that can be taken out is used. When it is necessary to give a gradient to the rehabilitation tube P2, a tube rehabilitation spacer 1 is used in which the height is gradually reduced from the upstream side to the downstream side in consideration of the gradient as shown in FIG. ..

The predetermined pitch is an arbitrary distance capable of stably holding the rehabilitation tube P2. It can be determined by the length of the rehabilitation tube P2 and the dimensions of the tube rehabilitation spacer 1.
The predetermined pitch may be a distance at which only one rehabilitation pipe P2 is placed on one pipe rehabilitation spacer 1 depending on the length of the rehabilitation pipe P2 and the height forming leg 2.
Alternatively, the predetermined pitch may be a distance at which one of two rehabilitation pipes P2 connected in the axial direction can be placed on each of both ends of the height forming leg 2 of one pipe rehabilitation spacer 1. Good.

Alternatively, the predetermined pitch is such that one or more pipe rehabilitation spacers 1 are placed in the center of one rehabilitation pipe P2 in the extending direction, and the pipe rehabilitation spacers 1 are placed so as to straddle between adjacent rehabilitation pipes P2. It may be.

Regardless of the pitch, the pipe rehabilitation spacer 1 has a configuration in which mounting members 3 arranged in parallel at intervals are connected by height-forming legs 2, so one is mounted. Only by itself, the two mounting members 3 and 3 can be easily arranged at intervals in the axial direction of the existing pipe P1.
The mounting member 3 may be deformed in advance according to the shape of the existing pipe P1.

[Rehabilitation pipe installation process]
After installing the pipe rehabilitation spacer 1 in the existing pipe P1, the rehabilitation pipe P2 is placed on the mounting member 3. When the rehabilitation tube P2 is installed on the tube rehabilitation spacer 1, the mounting plate is made of a thin steel plate of 0.25 mm to 3.2 mm, so that it can be fitted according to the shape of the rehabilitation tube P2. That is, the rehabilitation tube P2 is firmly held by the mounting member 3 over a certain range in the circumferential direction.
Therefore, the pipe rehabilitation spacer 1 has an effect that it is easy to install and can easily and stably support the rehabilitation pipe P2.

Further, the pipe rehabilitation spacer 1 has three sets of height-forming legs 2 arranged in the extending direction of the existing pipe P1, and the height-forming legs 2 have lengths in the extending direction, so-called legs. It has become. Therefore, the pipe rehabilitation spacer 1 is configured so as not to be displaced in the extending direction and the inner peripheral direction of the existing pipe P1 due to friction between the height forming leg 2 and the existing pipe P1.

Further, since the tube rehabilitation spacer 1 has three height-forming legs 2 arranged at equal intervals, the center of gravity of the rehabilitation tube P2 can be supported by the height-forming legs 2 at the center of the rehabilitation tube P2. The load of P2 can be supported in a well-balanced manner. Therefore, the tube rehabilitation spacer 1 has the effect of being able to hold the rehabilitation tube P2 more stably.

Further, the pipe rehabilitation spacer 1 has a height-forming leg 2 at a substantially center in the width direction of the mounting member 3, and the height-forming leg 2 is well-balanced at a substantially center of the bottom of the existing pipe P1. Can be installed. Therefore, the pipe rehabilitation spacer 1 can be supported by the height forming member 2 provided at the center when installing an instrument such as a floating prevention chain used for the rehabilitation pipe P2, and the mounting member 3 is deformed. It has the effect of being able to prevent.

Since the height-forming legs 2 of the steel bars are only present in parallel with each other at intervals between the mounting members 3 and 3, the backfilling material to be filled later is sufficiently placed between the mounting members 3 and 3. It becomes possible to spread it.
Further, since the height-forming leg 2 is a steel bar having a diameter of about 10 mm to 51 mm and a substantially circular cross section, the volume can be suppressed as much as possible while forming a desired height depending on the diameter. Therefore, also in this respect, it is possible to spread the backfilling material to be filled later between the existing pipe P1 and the rehabilitation pipe P2 as much as possible.
Therefore, it is possible to densely fill the backfilling material by suppressing the formation of a space not filled with the backfilling material between the existing pipe P1 and the rehabilitation pipe P2 as much as possible.

Further, when the deformed reinforcing bar is used, the height-forming leg portion 2 has a large contact area of the backfill material and is more complicated than a smooth round bar, so that the height-forming leg portion 2 is firmly fixed in the backfill material.
Therefore, it is possible to prevent the height-forming leg 2 and the backfilling material from being displaced from each other, and to maintain the high-quality rehabilitation pipe P2 for a long period of time.

In addition, the pipe rehabilitation spacer 1 and the rehabilitation pipe P2 may be installed after the pipe rehabilitation spacer 1 is installed in an appropriate number. Alternatively, the installation of the pipe rehabilitation spacer 1 and the rehabilitation pipe P2 is a method in which the installation of the number of pipe rehabilitation spacers 1 required for placing one rehabilitation pipe P2 and the installation of one rehabilitation pipe P2 are alternately performed. It may be. Which method to adopt can be appropriately selected depending on the rehabilitation method of the existing pipe P1.

[Backfill material injection process]
When all the rehabilitation pipes P2 to be laid have been installed, a backfill material such as mortar is filled and injected between the existing pipes P1 and the rehabilitation pipes P2, and the rehabilitation of the existing pipes P1 is completed.

When the existing pipe P1 is rehabilitated as described above, the pipe rehabilitation spacer 1 is buried between the existing pipe P1 and the rehabilitation pipe P2 with a backfill material. However, since the pipe rehabilitation spacer 1 is made of a steel material, it is regarded as a part of the RC structure. Therefore, the rehabilitation tube P2 in which the tube rehabilitation spacer 1 of the present invention is used has an effect that it is possible to avoid being treated as a constituent defect due to the tube rehabilitation spacer 1 being regarded as a foreign substance.

Further, since the pipe rehabilitation spacer 1 is formed by using a rod member 4 having a diameter of up to about 51 mm and a thin steel plate having a thickness of up to 3.2 mm, it is lightweight and inexpensive due to a very simple structure. It has the effect of being able to form.

In the above embodiment, an example in which three sets of height-forming legs 2 made of steel bars are used has been shown, but it is particularly necessary that two or more sets of height-forming legs 2 are arranged in parallel. Not limited. However, considering that the center of gravity when the rehabilitation tube P2 is placed on the central portion of the mounting member 3 in the longitudinal direction is taken into consideration, the height forming leg 2 is an odd number of three or more, and one in the center. It is preferable that they are arranged symmetrically with respect to the center. For example, the tube rehabilitation spacer 1 may include five sets of height-forming legs 2 as shown in FIG.

Further, as shown in FIG. 6, three or more mounting members 3 may be used as long as a plurality of mounting members 3 are fixed at intervals in the extending direction of the height forming legs 2.
Further, in the pipe rehabilitation spacer 1 in which the peripheral surfaces 4a of the plurality of rod members 4 and 4 are overlapped and welded, at least the rod members 4 should be capable of fixing the mounting members 3 and 3 at both ends. For example, the rod member 4 in contact with the mounting member 3 and the height forming leg 2 located at the position farthest from the mounting member 3 may be divided into a plurality of parts and fixed at intervals. According to this configuration, the weight of the pipe rehabilitation spacer 1 can be made lighter, and the filling of the backfill material below the pipe rehabilitation spacer 1 can be promoted.

Further, the bar member 4 includes C-shaped steel or H-shaped steel. When the rod member 4 is a substantially columnar deformed reinforcing bar, it can be used without considering the angle of contact with the existing pipe P1, but the rod member 4 is not limited to this and is securely fixed to the existing pipe P1. It is also possible to use C-shaped steel or H-shaped steel as much as possible.

1 Spacer for pipe rehabilitation 2 Height forming leg 3 Mounting member 4 Rod member P1 Existing pipe P2 Rehabilitation pipe

Claims (9)

A height-forming leg portion formed by a rod member provided at intervals in the circumferential direction centered on the axis of the existing pipe and along the longitudinal direction in the extending direction of the existing pipe.
A tube rehabilitation spacer comprising a mounting member for a rehabilitation tube fixed between the plurality of height-forming legs. The spacer for tube rehabilitation according to claim 1, wherein the plurality of height-forming legs are arranged in an odd number of three or more at intervals in the circumferential direction. The spacer for pipe rehabilitation according to claim 1 or 2, wherein the rod members constituting the plurality of height-forming legs are formed of deformed reinforcing bars. The spacer for pipe rehabilitation according to any one of claims 1 to 3, wherein the plurality of height-forming legs are provided with heights by overlapping the peripheral surfaces of the plurality of rod members. The spacer for pipe rehabilitation according to claim 4, wherein a plurality of the plurality of rod members whose peripheral surfaces are overlapped with each other are linearly fixed at intervals in the extending direction of the existing pipe. The spacer for pipe rehabilitation according to any one of claims 1 to 5, wherein a plurality of the above-mentioned placing members are arranged at intervals in the longitudinal direction of the height-forming legs. The spacer for pipe rehabilitation according to any one of claims 1 to 6, wherein the above-mentioned placing member is made of a deformable plate material. The spacer for pipe rehabilitation according to any one of claims 1 to 7, wherein the height-forming leg and the above-mentioned placing member are made of a steel material. A spacer installation step of arranging the pipe rehabilitation spacer according to any one of claims 1 to 8 in an existing pipe at a predetermined pitch, and
An existing pipe having a rehabilitation pipe installation step of installing a rehabilitation pipe on a mounting member of the pipe rehabilitation spacer and a backfill material injection step of injecting a backfill material between the existing pipe and the rehabilitation pipe. Rehabilitation method.

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