JP6679800B1 - Spacer for pipe rehabilitation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe rehabilitation spacer which is easy to deploy and can stably hold a rehabilitation pipe. SOLUTION: A plurality of spacers 1 for pipe rehabilitation of the present invention are provided at intervals in the circumferential direction around the axis of the existing pipe P1, and are provided with rod members 4 which extend along the longitudinal direction in the extending direction of the existing pipe P1. The height forming leg 2 is formed, and the mounting member 3 of the rehabilitation pipe P2 fixed between the plurality of height forming legs 2 and 2. It is preferable that the plurality of height forming leg portions 2 are arranged at intervals in the circumferential direction and are arranged in three or more and odd number. [Selection diagram] Fig. 3

Description

  The present invention relates to a spacer for pipe rehabilitation.

  When rehabilitating a pipe by arranging a rehabilitating pipe in an existing pipe buried underground, the axis of the rehabilitating pipe may have to be aligned 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 case, when the rehabilitation pipe installed in the existing pipe has to be inclined, the height of an axis line different from the axis line of the rehabilitation pipe with the existing pipe may need to be adjusted.

  In the above case, conventionally, a substantially cubic block made of wood chips or the like having a thickness (height) on the bottom of the existing pipe has been used as a spacer. 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 extends.

However, since the conventional spacer is a substantially cubic block in which the upper surface is the mounting portion and the height is set by the thickness, the positioning of the spacers when arranging them in advance is troublesome, and it is easy to move, and the rehabilitation pipe The installation was not stable.
Therefore, the present invention provides a pipe rehabilitation spacer that can be easily arranged and can stably hold a rehabilitation pipe.

The spacer for pipe rehabilitation according to the present invention is provided with a plurality of spacers arranged at intervals in the circumferential direction around the axis of the existing pipe, and the height forming leg is formed by a bar member extending along the longitudinal direction in the extending direction of the existing pipe. And a mounting member for the rehabilitation pipe fixed between the plurality of height forming leg portions.
According to this configuration, the plurality of height forming legs prevent the existing pipe from being displaced in the extending direction and the circumferential direction about the axis, and the pipe rehabilitation spacer is firmly arranged below the rehabilitation pipe. can do. Further, since the pipe rehabilitation spacer has a plurality of height forming legs and a plurality of mounting members, positioning is easy.

The plurality of height forming leg portions of the spacer for tube rehabilitation according to the present invention may be arranged in the circumferential direction at intervals of three or more and an odd number.
According to this configuration, by placing the central height-forming leg portion substantially at the center of the tube bottom of the existing pipe, the central height-forming leg portion receives the center of gravity of the rehabilitation pipe while maintaining the balance of the rehabilitating pipe as a whole. I can support you.

The bar members constituting the plurality of height forming leg portions 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 narrowed by the member forming the height, and the height forming leg portion is not treated as a foreign matter to the RC structure, and thus RC is formed. Considered part of the structure.

Each of the plurality of height forming leg portions of the spacer for tube rehabilitation of the present invention may have a height provided by overlapping the peripheral surfaces of the plurality of rod members.
With this configuration, for example, by using a substantially cylindrical rod member, it is possible to avoid increasing the cross-sectional area of the rod member and to provide the height of the pipe rehabilitation spacer with a volume as small as possible.

A part of the plurality of rod members having the peripheral surfaces of the present invention stacked on each other may be linearly fixed at intervals in the extending direction of the existing pipe.
According to this structure, the backfill material can be swiftly spread below the pipe rehabilitation spacer by allowing the backfill material to enter from between the bar members arranged on the same line.

A plurality of the mounting members of the spacer for tube rehabilitation of the present invention may be arranged at intervals in the longitudinal direction of the height forming leg portion.
According to this configuration, it is possible to more stably hold the rehabilitation pipe with one pipe rehabilitation spacer.

The mounting member of the spacer for tube 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 on site by human hands or by using a simple tool in accordance with the shape of the inner peripheral surface of the existing pipe or the outer peripheral surface of the rehabilitation pipe.

It is preferable that the height forming leg portion and the mounting member of the spacer for pipe rehabilitation according to the present invention are made of a steel material. Specifically, for example, the height forming leg is preferably a round bar for reinforced concrete or a deformed rebar, and the mounting member may be formed of a steel material such as a hot dip galvanized steel sheet or a cold rolled steel sheet.
According to this configuration, the pipe rehabilitation spacer can be made a part of the RC structure without being treated as a foreign matter to the RC structure.

The existing pipe rehabilitation method of the present invention comprises a spacer installation step of arranging the pipe rehabilitation spacers according to any one of the above at a predetermined pitch in the existing pipe, and a rehabilitation pipe on the 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.
According to this configuration, one of the above-mentioned effects can be exhibited, and the existing pipe can be rehabilitated simply and quickly.

  The pipe rehabilitation spacer of the present invention has the effects of being easily arranged and capable of stably holding the rehabilitation pipe.

(A) The front view which showed the spacer for pipe remodeling of one Embodiment of this invention, (b) The same top view, (c) The same side view. It is the figure which cut and showed the installation state of the spacer for pipe rehabilitation of one embodiment of the present invention in the direction orthogonal to the axis of an existing pipe. In the installed state of the spacer for pipe rehabilitation of one embodiment of the present invention, a state in which the axis of the rehabilitating pipe is installed to match the axis of the existing pipe is shown by cutting along a vertical plane including the axis of the existing pipe. FIG. In the installed state of the spacer for pipe rehabilitation of one embodiment of the present invention, a state in which the rehabilitating pipe to be installed in the existing pipe is installed with a gradient, the cross section taken along a vertical plane including the axis of the existing pipe It is a figure. It is the figure which cut | disconnected and showed the installation state of the other example of the spacer for pipe remodeling of one embodiment of this invention in the direction orthogonal to the axis line of an existing pipe. It is the side view which showed the other example of the spacer for pipe remodeling of one embodiment of this invention.

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

The height forming leg portion 2 is formed of a rod member 4 having a substantially circular cross section, although not limited thereto. The bar member 4 is preferably a bar steel, and more preferably a deformed 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 in the axial direction of the rod member 4) 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. Although it can be set as appropriate depending on the ease of transportation, it may be set to, for example, about 500 mm.

  In order to provide the height by the height forming leg portion 2 described above, the bar member 4 having a diameter that matches the desired height is used, or the peripheral surfaces 4a of the plurality of bar members 4 are stacked and fixed. In addition, when a plurality of rod members 4 are overlapped to obtain a height dimension, as shown by solid line rod members 4 and phantom line rod members 4 in FIG. By stacking the peripheral surfaces 4a on the same straight line, the height can be stably and efficiently obtained. Further, when the rod members 4 and 4 are overlapped with each other, they may be fixed by any method as long as the rod members 4 and 4 are not displaced, but it is preferable to fix them by welding.

The mounting member 3 is made of a steel plate. The type of steel sheet is not particularly limited, but for example, hot-dip galvanized steel sheet, 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 length in the axial direction 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 within the above range, it is possible to deform the mounting member 3 according to the shape of the existing pipe P1 by the force of a human hand or using a simple tool.

The tube rehabilitation spacer 1 can be made as follows using the height forming leg 2 and the mounting member 3 having the above-described configurations.
As a whole, three sets of height forming leg portions 2 having the same shape and size are prepared, and two mounting members 3 having the same shape and size are prepared. The height forming leg portion 2 may be configured by using rod members 4 having different diameters as long as the height forming leg portion 2 can form the same shape and the same size 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 the height forming legs 2 are provided 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 placing member 3 is placed with its surface lying so that the plate surface 3a forming a flat surface faces the peripheral surface 4a of the rod member 4.

Then, the three portions of the height forming legs 2, 2, 2 and the two mounting members 3, 3 are welded to each other so that the height forming legs 2 and the mounting member 3 are connected to each other. Fix firmly at the intersection.
As described above, the pipe rehabilitation spacer 1 is completed. Next, a method of using the spacer 1 for tube rehabilitation will be described. The pipe rehabilitation spacer 1 is arranged as follows.

[Spacer installation process]
The pipe rehabilitation spacer 1 is disposed directly on the existing pipe P1 before the rehabilitation pipe P2 is installed after removing foreign matters by cleaning the inside of the existing pipe P1. 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. , Are arranged along the extending direction of the existing pipe P1 (the depth direction of the paper surface in FIG. 2). The mounting member 3 spreading on both sides of the central height forming leg portion 2 is deformed so as to follow the shape of the existing pipe P1 or to be parallel. As a result, the height forming leg portions 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 with respect to the already installed pipe rehabilitation spacer 1 in the depth direction or the front direction in which the existing pipe P1 extends. Whether to arrange the pipe rehabilitation spacer 1 toward the front or the depth direction is determined according to which position of the rehabilitation portion of the existing pipe P1 the retrial spacer 1 has started to be arranged or the kind of the existing pipe rehabilitation method.

  In the plurality of spacers 1 for pipe rehabilitation, the height forming legs 2 are oriented in the extension direction of the existing pipe P1 (or the arrangement direction of the rehabilitation pipe P2), and the mounting members 3 are spaced in the extension 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 to have an appropriate height in consideration of the installation height or slope of the rehabilitation pipe P2. Specifically, when aligning the axis of the rehabilitation pipe P2 to be installed with the height of the existing pipe P1 being substantially constant to the axis of the existing pipe P1, a constant height dimension is set as shown in FIG. The spacer 1 for pipe rehabilitation that can be taken out is used. In addition, when it is necessary to make a gradient in the rehabilitation pipe P2, the pipe rehabilitation spacer 1 whose height is gradually reduced from the upstream side to the downstream side is used in consideration of the gradient as shown in FIG. .

The predetermined pitch is an arbitrary distance that can stably hold the rehabilitation pipe P2. It can be determined by the length of the rehabilitation pipe P2 and the dimensions of the pipe rehabilitation spacer 1.
The predetermined pitch may be a distance by which only one rehabilitation pipe P2 is placed on one pipe rehabilitation spacer 1 depending on the lengths of the rehabilitation pipe P2 and the height forming leg 2.
Alternatively, the predetermined pitch may be a distance such that one of the two rehabilitation pipes P2 to be coupled in the axial direction can be placed on each of both ends of the height forming leg portion 2 of one pipe rehabilitation spacer 1. Good.

  Alternatively, the predetermined pitch is a dimension in which one or more pipe rehabilitation spacers 1 are placed at the center of one rehabilitation pipe P2 in the extending direction and the pipe rehabilitation spacers 1 are arranged so as to straddle between adjacent rehabilitation pipes P2. May be

Regardless of the pitch, the pipe rehabilitation spacer 1 has a configuration in which the mounting members 3 arranged in parallel with a space therebetween are connected by the height forming leg portions 2, so that one is mounted. Only then, 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 by deforming the mounting member 3 according to the shape of the existing pipe P1.

[Rehabilitation pipe installation process]
After the pipe rehabilitation spacer 1 is installed in the existing pipe P1, the rehabilitation pipe P2 is placed on the mounting member 3. When the rehabilitation pipe P2 is installed on the pipe rehabilitation spacer 1, the mounting plate is made of a thin steel plate having a size of 0.25 mm to 3.2 mm, so that the rehabilitation pipe P2 can be fitted to the shape of the rehabilitation pipe P2. That is, the rehabilitation pipe 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 can be easily installed and can support the rehabilitation pipe P2 simply and stably.

  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 leg 2 is a so-called leg having a length in the extending direction. Has become. Therefore, the pipe rehabilitation spacer 1 is configured so as not to be displaced in the extending direction or the inner circumferential direction of the existing pipe P1 due to the friction between the height forming leg portion 2 and the existing pipe P1.

  Further, the pipe rehabilitation spacer 1 has three height forming legs 2 arranged at equal intervals, so that the center of gravity of the rehabilitation pipe P2 can be supported by the height forming legs 2 at the center thereof. The load of P2 can be supported with a good balance. Therefore, the pipe rehabilitation spacer 1 has an effect that the rehabilitation pipe P2 can be held more stably.

  Further, the pipe rehabilitation spacer 1 has a height forming leg portion 2 substantially at the center of the mounting member 3 in the width direction, and the height forming leg portion 2 is well balanced about the center of the pipe 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 a device such as a floating prevention chain used for the rehabilitation pipe P2 is installed, and the mounting member 3 is deformed. There is an effect that it is possible to prevent.

Since the height forming legs 2 of the steel bars are present only in parallel between the placing members 3 and 3, the backfill material to be filled later is sufficiently provided between the placing members 3 and 3. It becomes possible to spread it.
Further, since the height forming leg portion 2 is a steel bar having a diameter of about 10 mm to 51 mm and a cross section of a substantially circular shape, it is possible to form a desired height depending on the diameter and to suppress the volume as much as possible. Therefore, also in this respect, it becomes possible to spread the backfill 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 backfill material by suppressing the formation of a space not filled with the backfill material between the existing pipe P1 and the rehabilitation pipe P2.

Further, when the deformed reinforcing bar is used, the height forming leg portion 2 has a large contact area of the backfill material and becomes more complicated than a smooth round bar, and thus is firmly fixed in the backfill material.
Therefore, it is possible to prevent a gap or the like from occurring between the height forming leg portion 2 and the backfill material, and it is possible to hold the high quality rehabilitation pipe P2 for a long period of time.

  As for the installation of the pipe rehabilitation spacer 1 and the rehabilitation pipe P2, the rehabilitation pipe P2 may be installed after the pipe rehabilitation spacers 1 are installed in an appropriate number. Alternatively, the pipe rehabilitation spacer 1 and the rehabilitation pipe P2 are installed by alternately performing the installation of the pipe rehabilitation spacers 1 and the number of the pipe rehabilitation pipes P2 necessary for placing one rehabilitation pipe P2. May be Which method is used can be appropriately selected depending on the method of rehabilitating the existing pipe P1.

[Back filling material injection process]
When all the rehabilitation pipes P2 to be laid are installed, a backfill material such as mortar is filled and injected between the existing pipes P1 and 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 by the backfill material between the existing pipe P1 and the rehabilitation pipe P2. However, the pipe rehabilitation spacer 1 is considered to be a part of the RC structure because it is made of steel. Therefore, the rehabilitation pipe P2 in which the pipe rehabilitation spacer 1 of the present invention is used has an effect of being able to avoid being treated with a structural defect due to the pipe rehabilitation spacer 1 being regarded as a foreign matter.

  Further, since the pipe rehabilitation spacer 1 is formed by using the bar member 4 having a diameter of up to about 51 mm and the thin steel plate having a thickness of up to 3.2 mm, it is lightweight and inexpensive due to a very simple structure. There is an effect that it can be formed.

  In addition, in the said embodiment, although the example which used 3 sets of height formation leg parts 2 comprised by the steel bar was shown, especially if the height formation leg parts 2 are arrange | positioned in parallel 2 or more sets. Not limited. However, considering that the center of gravity when the rehabilitation pipe P2 is placed in the central portion in the longitudinal direction of the placing member 3 is taken into consideration, the height forming leg portion 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. For example, the tube rehabilitation spacer 1 may include five sets of height forming legs 2 as shown in FIG.

Moreover, 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 leg 2.
In addition, 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 member 4 can fix the mounting members 3 and 3 at both ends. For example, the rod member 4 contacting the mounting member 3 and the height forming leg portion 2 at the farthest position 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 further reduced, and the filling of the backfill material below the pipe rehabilitation spacer 1 can be promoted.

  Further, the rod member 4 includes C-type steel or H-type steel. When the rod member 4 is a deformed rebar having a substantially cylindrical shape, it can be used without considering the angle applied to 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-section steel or H-section steel as much as possible.

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

Claims (7)

A plurality of height-forming legs formed by a rod member and provided along the longitudinal direction of the existing pipe along the longitudinal direction and provided at intervals in the circumferential direction of the existing pipe about the axis, and a plurality of the heights. A mounting member for the rehabilitating pipe that is fixed across the forming legs and that is fixed at a plurality in the longitudinal direction of the height forming legs at intervals .
The mounting member is formed of a deformable plate material,
A spacer for pipe rehabilitation, wherein the height forming legs are all formed to have the same height .   The pipe rehabilitation spacer according to claim 1, wherein the plurality of height forming leg portions are arranged at intervals in the circumferential direction and are arranged in three or more and odd number.   The pipe remodeling spacer according to claim 1 or 2, wherein the bar members forming the plurality of height forming leg portions are formed of deformed reinforcing bars. 4. The pipe rehabilitation according to any one of claims 1 to 3, wherein each of the plurality of height forming leg portions is provided with a height by stacking the plurality of rod members in a direction in which they are separated from the placing member . Spacer.   The pipe rehabilitation spacer according to claim 4, wherein a part of the plurality of rod members whose peripheral surfaces are overlapped with each other is fixed linearly at intervals in the extending direction of the existing pipe. The pipe rehabilitation spacer according to any one of claims 1 to 5 , wherein the height forming leg portion and the mounting member are made of a steel material. A spacer installation step of arranging the spacer for pipe rehabilitation according to any one of claims 1 to 6 in an existing pipe at a predetermined pitch,
A rehabilitating pipe installation step of installing a rehabilitating pipe on the mounting member of the pipe rehabilitation spacer,
A method for rehabilitating an existing pipe, comprising a step of injecting a backfill material between the existing pipe and the rehabilitating pipe.

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