Pipe inner wall guide member and existing pipe rehabilitating pretreatment method

Abstract

To provide a guide member and a measuring method of a pipe inner wall capable of accurately pre-treating the inner wall of an existing pipe at a necessary minimum in order to secure a reference outer shape of a regeneration pipe installed in the existing pipe.SOLUTION: To provide a guide member of a pipe inner wall having a ring part arranged along the circumferential direction on the inner wall of an existing pipe to be regenerated. The ring portion may be formed to be dividable and connectable.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a guide member for an inner wall of a pipe and a pre-rehabilitation method for an existing pipe. [Background technology]

[0002] Pipes (existing pipes) that are built underground and carry sewage, etc., can have their inner walls significantly deformed from the time they are first manufactured due to damage caused by corrosion or erosion, or the adhesion of mortar or other foreign matter. When an existing pipe has become deformed due to corrosion of the inner wall, etc., workers enter the existing pipe and perform "pre-processing" such as removing corroded areas, deposits and intruders, chipping and repairing until the inner diameter of the pipe is large enough to accommodate the designed diameter of the rehabilitated pipe.

[0003] In the past, existing pipe rehabilitation was performed by combining the remaining strength of the existing pipe with the strength of the rehabilitated pipe, or by adding backfill materials such as mortar to reinforce the rehabilitated pipe. In such composite pipe rehabilitation, the existing pipe's strength was expected to be maintained to a certain extent. Therefore, since it was sufficient to obtain dimensions within the existing pipe that allowed the rehabilitated pipe to be installed, even if the pre-treatment process was slightly "over-removed," problems with the pre-treatment and installation of the rehabilitated pipe were unlikely to occur. Therefore, the extent of the pre-treatment process was not particularly important, and pre-treatment of deposits and deposits was mostly performed by eye or relatively roughly using a staff with a crossed scale.

[0004] In response to this, in recent years there has been an increasing need for self-supporting pipe rehabilitation, which does not rely on the remaining strength of the existing pipe, but instead ensures strength solely through the rehabilitated pipe.This is because the existing pipe can be used even if it has been severely damaged and has zero remaining strength, but because strength is ensured solely through the rehabilitated pipe, it is only necessary to inject a minimum amount of interfacial material between the rehabilitated pipe and the existing pipe to secure the rehabilitated pipe, minimizing the use of expensive mortar. Summary of the Invention [Problem to be solved by the invention]

[0005] However, when rehabilitating a self-supporting pipe, the inner wall of the existing pipe generally undergoes significant deformation, and if the amount of corrosion or foreign matter adhering to the existing pipe that inhibits the formation of the rehabilitated pipe (collectively referred to as "inhibitory amount" in this specification) is large, the amount of work required for pre-processing will increase. Furthermore, the amount of obstruction in the axial direction of an existing pipe is not constant but fluctuates, and if the dimensional variations are large, it is difficult to estimate the extent to which pre-treatment such as chipping of the inner wall is necessary, and there is a risk that the pre-treatment will be excessive and the existing pipe itself will be damaged unnecessarily.

[0006] In particular, when using self-supporting pipes, existing pipes are often prone to collapse due to significant deformation and extensive damage. Furthermore, the self-supporting pipes currently used for rehabilitation are often relatively small in diameter (e.g., φ800-900mm) to ensure strength, and are applied to existing pipes that fit these dimensions. Therefore, the inside of existing pipes at work sites becomes a narrow space that is prone to collapse, and this creates a great deal of stress for workers.

[0007] Therefore, in the pre-processing for self-supporting pipe rehabilitation, it is particularly important not only to prepare the inner wall of the existing pipe so as not to impede the installation of the rehabilitation pipe, but also to avoid further damage to the existing pipe and to keep pre-processing inside the existing pipe to a minimum so that the work can be completed accurately and quickly in as short a time as possible, both for the sake of work efficiency and the peace of mind of the workers. However, it is not easy to visually measure the minimum installation dimensions of the rehabilitated pipe within the existing pipe in the dark. Also, if too much preparatory work is done, it will require redoing, which will take extra time and effort. Therefore, the present invention provides a guide member and a measurement method for the inner wall of a pipe that can measure the minimum number of pre-treatment locations and the minimum amount of treatment required for laying a rehabilitation pipe in the pre-treatment of an existing pipe. [Means for solving the problem]

[0008] The guide member for the inner wall of a pipe of the present invention has a ring portion formed to the shape and dimensions of the inner wall of the existing pipe to be secured for the installation of a rehabilitation pipe. With this configuration, by aligning the ring portion of the guide member with a reference position such as the inner wall surface of the existing pipe, it is possible to easily identify deformed areas on the inner wall of the existing pipe that may hinder the laying of the rehabilitation pipe and the minimum area that needs to be repaired.

[0009] The ring portion of the guide member for the inner wall of a pipe of the present invention may be formed so as to be separable and connectable. With this configuration, even if the diameter of the ring portion is large, the ring portion can be separated and passed through a manhole, allowing it to be easily carried into an existing pipe.

[0010] The ring portion of the guide member for the inner wall of a pipe of the present invention may have a peripheral wall extending in the central axis direction with a constant shape and dimensions, and may be formed in a cylindrical shape. According to this configuration, the outer peripheral surface of the ring portion can be placed on the bottom of the existing pipe, making it easy to raise the ring portion inside the existing pipe.

[0011] The pre-rehabilitation treatment method for an existing pipe of the present invention includes a shape measurement process for the inner wall of the pipe, in which a guide member for the inner wall of the pipe described in any one of the above is aligned with a reference position within an existing pipe having a predetermined shape, and the deformation state of the inner wall of the existing pipe is measured, and a repair process for performing repairs to reduce uneven areas of the inner wall of the pipe so that the guide member can be inserted into the inner wall with a dimensional difference within a set reference value. According to this configuration, the inner wall of the existing pipe, which has been deformed, can be appropriately pre-treated. [Effects of the Invention]

[0012] The guide member for the pipe inner wall and the pre-treatment method for rehabilitation of existing pipes of the present invention have the effect of easily measuring the minimum amount of pre-treatment required to ensure the standard outer diameter of the specified rehabilitation pipe, thereby enabling accurate and efficient pre-treatment of the inner wall of the existing pipe. [Brief explanation of the drawings]

[0013] [Figure 1] 1A and 1B are front and right side views of a guide member for a pipe inner wall according to an embodiment of the present invention; [Figure 2] 2(a) is a front view showing a divided body of the ring portion of the guide member for the inner wall of a pipe according to one embodiment of the present invention, and (b) is a view of one end of the divided body of the ring portion of the inner wall of a pipe according to one embodiment of the present invention, as viewed in the direction of line CC in FIG. [Figure 3] 1 is a schematic diagram showing a process for measuring the shape of the inner wall of a pipe in a pre-rehabilitation treatment method for an existing pipe according to one embodiment of the present invention. FIG. [Figure 4] 1 is a schematic diagram showing a shape measurement process of a pre-rehabilitation treatment method for an existing pipe according to one embodiment of the present invention. FIG. [Figure 5] 1A and 1B are a perspective view and a side view, respectively, of a guide member for a pipe inner wall according to another embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an embodiment of a guide member for a pipe inner wall of the present invention will be described with reference to the drawings. Note that the dimensions of each part in the drawings used in the following description are not necessarily the same as the actual dimensions and can be changed as appropriate.

[0015] As shown in Figure 1, the pipe inner wall guide member 1 in one embodiment has a ring portion 2 made by bending a steel round bar (in this embodiment, formed into a nearly perfect circle) to match the shape and dimensions of the inner wall of the existing pipe that must be secured for the installation of a rehabilitation pipe, i.e., the reference outer diameter of the rehabilitation pipe to be installed. In this specification, the "reference outer diameter of the rehabilitation pipe" refers to the outer diameter set by the sum of the designed inner diameter and the thickness of the rehabilitation pipe to be installed. If the shape of the rehabilitation pipe is not circular, the reference outer diameter of the rehabilitation pipe refers to the sum of the designed inner diameter of the rehabilitation pipe and the thickness of the rehabilitation pipe to be installed. The ring portion 2 may be solid or hollow (ie, a steel pipe) as long as it has a predetermined rigidity.

[0016] As shown in FIG. 2(a), the ring portion 2 is formed by assembling a plurality of divided bodies 3, 3. The divided body 3 is curved in a semicircular shape by dividing the substantially circular ring portion 2 in half along the diameter line. The divided body 3 is formed from a solid round bar or hollow tube (round bar in this embodiment) with a circular cross section.

[0017] As shown in Figures 2(a) and (b), flat plates 4, 4 are welded to both ends of the divided body 3 so as to sandwich each end from the front 3s side and the back 3y side when looking at the semicircle from the front (in other words, so as to sandwich a round bar extending on the same plane at one apex 3t on its circumferential surface and the other apex 3t located on the opposite side). The flat plate 4 is formed with at least one screw insertion hole 4a penetrating through the plate in the thickness direction.

[0018] The flat plate 4 on the rear surface 3y side, including the insertion holes 4a, is provided to overlap the flat plate 4 on the front surface side in the thickness direction of the round bar. The end of the round bar may be slightly flattened between the flat plates 4, 4 due to welding.

[0019] At both ends of the divided body 3, through holes for screws are formed which communicate with the insertion holes 4a of one flat plate 4 and the insertion holes 4a of the other flat plate 4. Auxiliary flat plates 5 are welded to both ends of the divided body 3 so as to protrude inward of the arc at approximately the center in the thickness direction of the round bar. The auxiliary flat plates 5 are arranged so that the insertion holes 4a of the flat plate 4 penetrate in the thickness direction. The auxiliary flat plate 5 has a screw insertion hole 5a formed near the center of the plate surface, penetrating in the thickness direction.

[0020] As shown in Figures 1(a) and (b), when the end faces of the round bars of the divided bodies 3, 3 are butted together to form a perfect circle, the flat plates 4 and auxiliary flat plates 5 of each divided body 3 are adjacent to each other. The divided bodies 3, 3 are fixed in a manner that allows them to be separated and connected by a connecting plate 6 that covers the space between adjacent flat plates 4, 4 when their ends are butted together and can be fixed by inserting screws into insertion holes that match each insertion hole 4a.

[0021] 1(a) and 2(b), the adjacent auxiliary plates 5, 5 between the divided bodies 3, 3 are covered by auxiliary connecting plates 7 on either the front or back of the auxiliary plate 5, and adjacent auxiliary plates 5, 5 are fixed so as to be separable and connectable by inserting and fixing screws into the insertion holes 5a of each auxiliary plate 5 and the corresponding insertion holes of the auxiliary connecting plate 7. The screws inserted into the insertion holes of the flat plate 4 and the connecting plate 6 and the insertion holes of the auxiliary plate 5 and the auxiliary connecting plate 7 may specifically be constituted by bolts and nuts, for example.

[0022] By connecting the divided bodies 3, 3 in this manner, the ring portion 2 is formed into a circular ring shape. The adjacent flat plates 4, 4 and auxiliary connecting plates 5, 5 between both ends of the divided bodies 3, 3 do not necessarily need to be in contact with each other as long as they can be connected by the connecting plates 6 and auxiliary connecting plates 7.

[0023] The outer diameter of the ring portion 2 is formed to a standard outer shape. The inner diameter of the ring portion 2 is preferably formed to be the same as the design inner diameter of the rehabilitating pipe to be laid.

[0024] Next, a method for repairing the inner wall surface of an existing pipe that has been deformed due to unevenness caused by corrosion or the like, using the guide member 1 of this embodiment, will be described.

[0025] <Tube bottom confirmation process> First, it is confirmed whether the bottom of the existing pipe has the required shape. If the bottom of the pipe is deformed and does not have the required shape, i.e., the required arc shape in this embodiment, concrete may be poured under the pipe to form the required arc shape.

[0026] <Pipe inner wall shape measurement process> After confirming that there are no major problems with the shape of the bottom of the existing pipe, as shown in Figure 3, the shape of the inner wall of the pipe is measured by aligning the guide member 1 along the bottom of the existing pipe X (which may be immersed in the service water W) or the inner wall of the pipe, and measuring whether the deformation of the inner wall of the existing pipe X is within a standard value relative to the standard outer shape, and if it is above the standard value, the degree of deformation. At this time, a laser can be used to measure the tube axis direction.

[0027] <Pipe inner wall repair process> In the process of repairing the inner wall of the pipe, deposits such as free lime and mortar adhere to the inner wall of the existing pipe X, and any portions of the inner wall that have penetrated into the guide member 1 installed as described above by more than the set standard value are scraped off with a tool.

[0028] In this work, in the past, when large deposits such as deposits were present, workers would either visually remove them while estimating the original shape of the existing pipe, or use a staff (a crossed scale), without using tools like the present invention. However, when the work of smoothing the inner wall of the existing pipe was done by eye, it resulted in inappropriate work, such as excessive scraping, insufficient processing, or a distorted shape, which required redoing and repeated repairs, which was time-consuming. In addition, because excessive pre-processing could damage the existing pipe and even cause partial collapse, workers were forced to proceed with the pre-processing carefully, which reduced work efficiency.

[0029] Furthermore, even when staff were used, it was not easy to properly measure how the existing pipe had deformed relative to its intended inner wall shape, which took a lot of time and was prone to overdoing or inappropriate treatment, as described above.

[0030] In contrast, by using the guide member 1 of the present invention, it is possible to apply the guide member 1 and check the deformation state almost accurately, and remove the adhesions while applying the guide member 1, or to temporarily remove the guide member 1 that has been applied to the inner wall of the pipe and remove the deformation that was checked just before.

[0031] Specifically, in areas where the inner wall of the existing pipe X has been corroded by corrosion or the like and has become recessed to a value greater than the set standard value outside the shape of the ring portion 2, repairs are made to fill in the recess as necessary and make it as smooth as possible to the specified shape so that the inner wall of the pipe does not collapse.

[0032] Once the repair of the inner wall of the existing pipe X is complete, the guide member 1 is used again to check whether the shape of the inner wall of the repaired area is appropriate, as shown in Figure 4. If the check reveals that there are still deformed areas that need to be repaired, the above-mentioned repair process for the inner wall of the pipe is carried out. This completes the preliminary treatment of the inner wall of the existing pipe X. Once the preliminary treatment is complete, the rehabilitation pipe can be laid.

[0033] By using the guide member 1 of the present invention to perform pre-treatment of an existing pipe before rehabilitation as described above, the degree of deformation can be confirmed by placing the guide member 1 against the inner wall of the existing pipe, allowing the minimum necessary work locations and treatment volume to be determined. Therefore, pre-work for laying the rehabilitation pipe can be performed accurately and efficiently. In other words, the present invention has the effect of preventing the waste of work caused by overdoing the pre-work for laying the rehabilitation pipe, and of performing the work efficiently and appropriately with the minimum necessary.

[0034] In addition, because workers can properly grasp the location and amount of pre-treatment and proceed with almost no hesitation, it is possible to complete the work itself within the existing, severely deteriorated pipes quickly (specifically, a few hours to a few days earlier), which has the effect of significantly reducing the mental burden on workers. Furthermore, a space can be formed within the existing pipe X in which a rehabilitation pipe can be laid with its axis substantially aligned so as to follow the design of the rehabilitation pipe without any problems.

[0035] In addition, the outer shape of the ring portion 2 is set by the sum of the design inner diameter and thickness of the rehabilitation pipe to be laid, and this dimension is set to the smallest possible diameter dimension that can be installed on the existing pipe X, thereby minimizing the amount of filler material to be filled between the rehabilitation pipe and the existing pipe, thereby achieving the effect of reducing the cost of rehabilitating the existing pipe.

[0036] In addition, the ring portion 2 of the guide member 1 of the present invention may be formed in a cylindrical shape having a peripheral wall that extends in a central axis direction with a constant shape and dimensions, with the standard outer shape of the rehabilitation pipe, as shown in Figures 5(a) and (b). In this case, the ring portion 2 may be formed by forming a long steel plate having a certain degree of rigidity into a ring or frame shape so that the flat surfaces of the steel plate form a cylindrical outer peripheral surface. 5(a) and 5(b) can be separated into two parts. The divided parts 3, 3 constituting the ring part 2 are fixed by connecting plates 6, through which screws can be inserted, sandwiching the adjacent ends from both the outer and inner peripheral surfaces.

[0037] Forming the ring portion 2 as shown in Fig. 5 has the effect of making it easier to install the ring portion 2 in a state where it stands upright at the bottom of the existing pipe X. Also, forming the thin plate into a cylindrical shape makes it possible to reduce the weight of the ring portion 2. Also, the same effects as those of the embodiment shown in Fig. 1 and the like can be achieved.

[0038] In the above embodiment, an example is shown in which the inner wall of an approximately circular existing pipe X is assumed. However, since the ring portion 2 can be formed to match the shape of the existing pipe X and the rehabilitating pipe, the present invention can also be applied to existing pipes X and rehabilitating pipes that are not circular.

[0039] Furthermore, in the above-described embodiment and its modified examples, the ring portion 2 is formed using a steel pipe or a steel plate, but the ring portion 2 may also be formed from a synthetic resin as long as its rigidity can be sufficiently ensured.

[0040] Furthermore, even when the ring portion 2 is made of synthetic resin, the guide member 1 may be configured so that the ring portion 2 can be disassembled and connected into three or more separate parts. Configuring the ring portion 2 in this manner has the effect of facilitating transport into and out of the existing pipe X.

[0041] 1 etc. and the modified example shown in Fig. 5, the ring portion 2 is formed into a circular guide member 1 by fixing flat plates 4 welded to the ends of the divided bodies 3, 3 with connecting plates 6 and screws, and in some cases fixing auxiliary flat plates 5 together with auxiliary connecting plates 7. However, as long as the divided bodies 3, 3 are connected to form a substantially circular ring portion 2, they may be connected by means other than those of the above embodiment, such as by using joints or the like.

[0042] In either case of connection, if the diameter of the ring portion 2 of the guide member 1 is larger than the inner diameter of the manhole, the divided bodies 3, 3 can be disassembled and brought into the existing pipe X, and then assembled inside the existing pipe X to be used as the guide member 1. In other words, the guide member 1 has the advantage that it can be brought into the existing pipe without any problems even if the manhole is smaller than the diameter of the ring portion 2.

[0043] Furthermore, by being able to separate the ring portion 2, the guide member 1 can be easily transported at half its weight. In particular, self-supporting pipes for rehabilitation that are larger in diameter (e.g., φ1500-2000 mm) have recently been developed, and to ensure their strength, the thickness of the rehabilitation material used for the rehabilitation pipes has become approximately 50 mm. Therefore, the thickness of the ring portion 2 also becomes 40-50 mm, and the weight of the entire ring portion 2 becomes large, so being able to separate the ring portion 2 into the separate body 3 and carry it around is extremely convenient. Conversely, if the diameter of the ring portion 2 is smaller than the diameter of the manhole, the ring portion 2 does not need to be configured to be separable and connectable.

[0044] In addition, if a large amount of deposits or the like are attached to the inner wall of the existing pipe and the bottom of the existing pipe X cannot be identified or the guide member 1 cannot be inserted at all, prior to the above-mentioned pipe bottom confirmation process, some of the obvious deposits or deposits may be removed at a glance so that the position of the pipe bottom can be identified, and then preliminary processing may be performed using the guide member 1 in the above procedure.

[0045] Alternatively, in the case where the inner wall of the existing pipe X has significant adhesion of deposits or precipitates, as described above, the process of measuring the shape of the inner wall of the pipe and the process of repairing the inner wall of the pipe may be carried out simultaneously using the guide member 1. Alternatively, in a similar case where the desired position of the existing pipe X is known to some extent, the process of repairing the inner wall of the pipe may be carried out from the beginning using the guide member 1, and then the process of measuring the shape of the inner wall of the pipe may be carried out to confirm whether the inner wall of the existing pipe has achieved the desired shape.

[0046] In the process of measuring the shape of the inner pipe wall, it is preferable to measure the deformation of the inner pipe wall by placing the guide member 1 against the bottom or part of the inner pipe wall of the existing pipe X, but the guide member 1 may also be used by placing it at a reference position so that a pipeline is formed at the position to be secured within the existing pipe. [Explanation of symbols]

[0047] 1. Pipe inner wall guide member 2 Ring section 3 split body 4 flat plate 5 Auxiliary plate 6 Connecting plate 7 Auxiliary connection plate X Existing pipe

Claims

1. A guide member for the inner wall of a pipe having a ring portion formed to the shape and dimensions of the inner wall of an existing pipe to be secured for the laying of a rehabilitation pipe.

2. The guide member for a pipe inner wall according to claim 1 , wherein the ring portion is formed so as to be separable and connectable.

3. 2. The guide member for a pipe inner wall according to claim 1, wherein the ring portion is formed in a cylindrical shape and has a peripheral wall extending in a central axial direction with a constant shape and dimensions.

4. a pipe inner wall shape measuring step of aligning the pipe inner wall guide member according to any one of claims 1 to 3 along a reference position in an existing pipe having a predetermined shape and measuring a deformation state of the pipe inner wall of the existing pipe; A pre-rehabilitation treatment method for an existing pipe, comprising a repair process for reducing uneven areas on the inner wall of the pipe so that a guide member can be inserted into the inner wall of the pipe with a dimensional difference within a set standard value.

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