JP2004190814A - Method of protecting inner wall surface of hume pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of permanently maintaining a Hume (R) pipe in an excellent state by stopping the further deterioration of an inner wall surface of the existing Hume pipe. <P>SOLUTION: The inner wall of an existing concrete pipe sewer 1 is uniformly cut off throughout the entire inner wall surface to such a depth that a deteriorated portion 2 is completely removed to disclose non-deteriorated concrete surface 1a. The non-deteriorated concrete surface 1a is covered by laying down and fixedly fitting in order the ceramic panel pieces 4 of a specified size having a curvature along the curved surface thereof onto the non-deteriorated concrete surface. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for protecting an inner wall surface of a concrete sewer (hereinafter, abbreviated as a fume pipe) such as a concrete sewer pipe.
[0002]
[Prior art]
For example, a fume pipe buried in the ground is degraded by erosion of its inner wall surface due to hydrogen sulfide and other corrosive gases and deposits over a long period of use. If the deterioration is left unattended, the strength of the fume pipe will eventually decrease, leading to damage. Therefore, measures have been taken to reinforce the inner wall surface and to prevent the erosion deterioration from increasing.
[0003]
As a method for protecting the inner wall surface of the fume tube while providing the strength of the fume tube, for example, as described in Patent Document 1 below, the deteriorated portion of the inner wall surface of the existing fume tube is cut and removed by an automatic cutting machine, After covering the inner wall surface of the fume tube from which the deteriorated portion has been removed with a resin layer obtained by impregnating a base material made of fibers with a hardening resin in an uncured state, the resin layer is cured and the eroded or deteriorated portion is removed by cutting. It has been shown that a protective layer having a thickness corresponding to the reduced wall thickness or a thickness smaller than the thickness is formed, and this protective layer provides the fume tube with the same strength and durability as the new tube. Have been.
[0004]
The above-mentioned automatic cutting machine is also described in Patent Document 2 below.
[0005]
The coating of the resin layer on the inner wall surface of the fume tube is performed by compressing an uncured flexible hose containing a photocurable resin, a thermosetting resin, or a thermoplastic resin in the fume tube as described in Patent Document 1 below. By inverting or introducing by pulling in, and pressing along the inner wall surface of the fume tube with compressed air, and then irradiating the flexible hose with light or heating with a heated gas or liquid. This is done by curing a flexible hose and forming an impermeable lining on the inner wall of the fume tube.
[0006]
[Patent Document 1]
JP-A-8-232333 [Patent Document 2]
Japanese Patent Application Laid-Open No. 8-281636
[Problems to be solved by the invention]
The above-mentioned prior art is suitable for a fume tube having a relatively small inner diameter, for example, 800 mm or less, and a larger-diameter tube (for example, having an inner diameter of more than 200 mm) that can be entered by humans. (1.5 m or more) requires large-scale equipment, has problems in economics and construction technology, and cannot be applied practically at present.
[0008]
Such a large-diameter pipe does not significantly reduce the strength of the pipe itself even if there is some deterioration, so even if it is not always necessary to take reinforcement measures to compensate for the reduction in pipe strength, if left alone, It is necessary to stop the progress of the deterioration because it may lead to the collapse of the pipe.
[0009]
Accordingly, an object of the present invention is to provide a method capable of preventing the progress of deterioration of the inner wall surface of an existing fume tube and maintaining the fume tube in a good state permanently.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is characterized in that a ceramic panel piece of a predetermined size having a curve along the curved surface is mutually and undegraded on the undegraded concrete surface of the inner wall of the fume pipe. The undegraded concrete surface is covered by tightly fixing the undegraded concrete surface.
[0011]
According to the first aspect of the present invention, even in the case of a large-diameter fume tube, it is possible to easily provide a state in which a ceramic tubular body is provided in close contact with the inner wall thereof, and it is possible to reduce the cost. Since it does not require bulky and large-scale equipment, it is economically advantageous.
[0012]
The invention according to claim 2 is to uniformly cut and remove the inner wall of the existing concrete pipe over the entire inner wall up to a depth range where the deteriorated portion is completely removed, so that an undegraded concrete surface appears.
The exposed undegraded concrete surface is covered by successively laying down ceramic panel pieces of a predetermined size having a curved shape along the curved surface and tightly fixed to each other and to the undegraded concrete surface. And
[0013]
According to the second aspect of the present invention, even if an existing large-diameter fume pipe is used, it is possible to easily and economically perform the processing for preventing the progress of deterioration of the inner wall surface. In addition, by appropriately selecting the size of the ceramic panel piece according to the closely fixed portion of the inner peripheral surface of the fume tube, for example, a small-sized panel is provided at the upper portion of the inner peripheral surface of the fume tube, and a relatively large-sized panel is provided at the lower portion. By the selection, the work for tight fixing becomes easy.
[0014]
As a result, in the existing fume pipe, the undegraded concrete surface that has emerged after completely removing the deteriorated portion of the inner wall is covered with a ceramic panel piece that is not eroded by corrosive gas or the like. Since the mutual and non-deteriorated concrete surfaces and the ceramic panel pieces are fixedly adhered to each other, no deterioration occurs anymore after coating, and the good state of the fume tube can be maintained permanently.
[0015]
A third aspect of the invention is characterized in that the ceramic panel piece is fixedly adhered to the undegraded concrete surface by an adhesive.
[0016]
According to the third aspect of the invention, the close contact and fixing of the ceramic panel piece to the undegraded concrete surface can be performed by a relatively simple operation. As the adhesive, an epoxy resin adhesive excellent in durability, water resistance, acid resistance, chemical resistance, and ability to resist corrosion by microorganisms, in addition to the adhesive effect, is particularly suitable. In addition to such an organic adhesive, a composite adhesive such as resin cement is also preferable.
[0017]
The invention according to claim 4 is that, after cutting and removing the deteriorated portion, anchor bolts are attached to the concrete pipe from the undegraded concrete surface at predetermined intervals in a circumferential direction and an axial direction. Protruding the male screw part of the bolt from the undegraded concrete surface,
An insertion hole provided in the thickness direction of each of the ceramic panel pieces is fitted into the male screw part, and the tip of the male screw part is projected from the ceramic panel piece,
A nut is screwed onto the distal end of the male screw portion and tightened to fix a ceramic panel piece to the undegraded concrete surface.
[0018]
According to the fourth aspect of the invention, even when the ceramic panel piece is relatively large in size and heavy, the ceramic panel piece can be firmly fixed to the fume tube by the anchor bolt. In that case, by interposing an adhesive between the ceramic panel piece and the undegraded concrete surface, the two can be tightly contacted with no gap, and more firm adhesion can be achieved.
[0019]
The invention according to claim 5 is characterized in that the adjacent ceramic panel pieces are joined by complementary edge shapes.
[0020]
According to the invention as set forth in claim 5, it is possible to make a water-tight contact bonding between the ceramic panel pieces. At this time, by applying an adhesive to the joint surfaces of the ceramic panel pieces, the strength and the water-tightness of the connection portion are obtained. Is also enhanced.
[0021]
The invention according to claim 6 is that, after cutting and removing the deteriorated portion, prior to the fixing of the ceramic panel pieces, a liquid agent for enhancing protection inside the concrete and waterproofing is applied to the undegraded concrete surface. It is characterized by.
[0022]
According to the invention as set forth in claim 6, fine cracks are generated in the fume tube, and even when water permeates from the outer peripheral side, it is possible to prevent the water from reaching the undegraded concrete surface, The effect of fixing the ceramic panel pieces is not hindered by minute cracks in the fume tube.
[0023]
The invention according to claim 7 is characterized in that the ceramic panel piece is a fired porcelain product made of about 30% sewage sludge incinerated ash, about 35% porcelain fine material, and about 35% porcelain clay. And
[0024]
According to the invention described in claim 7, it is possible to effectively use a large amount of sewage sludge and pottery waste generated at a high rate of about 60%.
[0025]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings, taking as an example a case where the present invention is applied to an existing fume tube.
[0026]
FIG. 1 shows an existing fume tube in a cross section orthogonal to its axis. 1a and 1b, 1 indicates an existing fume pipe buried in the soil, and 2 indicates an inner peripheral wall portion of the fume pipe 1 which has been eroded and deteriorated by hydrogen sulfide or other corrosive gas. ing.
[0027]
In the case of this embodiment, the process starts with the step of removing the deteriorated portion 2 by cutting.
FIG. 1b schematically shows a cutting machine 3 used to accomplish this first step. As this cutting machine, the one described in Patent Document 1 or 2 can be used. The cutting machine 3 fed from the manhole into the fume tube has an arm member 3b that is extendable and retractable with respect to the fume tube 1, has a cutter 3a at a distal end, and is rotatable with respect to the axis of the fume tube. It is configured to be able to travel and move inside the fume tube 1. Deletion of the deteriorated portion 2 by the cutting machine 3 is performed by extending the arm member 3b and pressing the cutter 3a against the deteriorated portion, and moving the cutting machine in the axial direction of the fume tube while rotating the arm member 3b in this state. This is done by letting
The depth of the cut is determined by the degree of extension of the arm member 3b.
[0028]
In the above cutting process, cutting is performed uniformly over the entire inner wall surface up to a depth range where the deteriorated portion is completely removed, and as a result, a uniform inner peripheral surface 1a of the undegraded concrete appears on the fume pipe. I'm sullen. At the same time that the undegraded concrete surface is made to appear by cutting, it is preferable to apply a liquid agent, which will be described later, which provides protection and strengthening of the inside of the concrete and a water stopping effect, to the surface, which is provided in a cutting machine or cutting. This can be done by an injection device cooperating with the machine.
[0029]
In the next step, as shown in FIG. 1c, a piece of ceramic panel 4 of a predetermined size having a curvature along the exposed undegraded concrete surface 1a is brought into close contact with the undegraded concrete surface 1a and to the other side. It is fixed in a state where the edge is in contact with and closely adhered thereto, and is spread one after another. In this way, the entire undegraded concrete surface 1a is covered with the ceramic panel pieces 4, and as a result, as shown in FIG. 1d, a fume tube 1 in which a ceramic tube is provided in close contact with the inner peripheral surface is obtained. As a result, the concrete surface of the fume tube completely protected by the hard-to-degrade ceramic panel pieces 4 is no longer eroded by hydrogen sulphide or other corrosive gases and deposits, so that the fume tube 1 has a longer life. The durability can be maintained over a long period of time.
[0030]
Although the above-mentioned fixed ceramic panel piece 4 does not have a sufficient effect of supplementing the strength of the fume tube 1 whose thickness has been reduced by cutting, the fume tube itself has the necessary strength even after cutting and removing the deteriorated portion. Therefore, it is not necessary to take any reinforcement measures for the fume tube 1.
[0031]
The adhesion and fixing of the ceramic panel piece 4 to the undegraded concrete surface 1a can be performed using an adhesive. As the adhesive, polyurethane resin, cyanoacrylate, silicone rubber, etc. can be used.Especially, epoxy resin adhesive excellent in durability, water resistance, acid resistance, chemical resistance, and ability to resist corrosion by microorganisms is used. It is suitable. In addition, a composite adhesive such as resin cement can be used.
[0032]
Another example of the close fixing method is shown in FIGS. 2 and 3. According to this example, after cutting and removing the deteriorated portion 2, the anchor bolt 5 is attached to the fume pipe from the undegraded concrete surface 1a side. Attachment of the anchor bolt 5 is performed in a state where the base 5a is fitted into and fixed to the fume tube 1 and the male screw 5b protrudes from the concrete surface 1a. The attachment positions of the anchor bolts in the circumferential direction and the axial direction of the fume tube are determined according to the size of the ceramic panel piece 4 to be used.
[0033]
The ceramic panel piece 4 has an insertion hole 4a into which the male screw portion 5b is inserted. In the case of a large-sized and heavy ceramic panel piece, a plurality of insertion holes 4a may be provided in one ceramic panel piece, and anchor bolts may be arranged corresponding to the insertion holes.
[0034]
As shown in FIG. 3, in the ceramic panel piece 4, the male screw portion 5b is fitted into an insertion hole 4a provided therein, and the tip of the male screw portion is projected from the ceramic panel piece. The nut 6 is screwed into the tip and fastened to the undegraded concrete surface 1a. In this case, by providing an adhesive between the ceramic panel piece 4 and the undegraded concrete surface 1a, the degree of close contact between the two is further improved.
[0035]
The anchor bolt 5 may be made of stainless steel or a corrosion-resistant metal material, or may be made of resin such as FRP, or may be made of carbon fiber. Further, instead of providing the male screw portion 5b, another fastening means may be used.
[0036]
As shown in FIGS. 2 and 3, a concave portion 4c is provided at the position where the nut of the ceramic panel piece 4 is seated, and the nut 6 fits into the concave portion when tightened, and the ceramic panel piece together with the tip of the male screw portion 5b. It is preferable not to protrude inward from the surface of No. 4.
[0037]
The fixing of the ceramic panel piece 4 to the undegraded concrete surface 1a may be performed by using both an adhesive and an anchor bolt. For example, a relatively small-sized ceramic panel piece is fixed with an adhesive when suspended laterally from the top in the fume tube, and a relatively large-sized ceramic panel piece is fixed with an adhesive and / or an anchor bolt below. You may do so. Of course, anchor bolts may be used for fixing small-sized ceramic panel pieces.
[0038]
By arranging a relatively small-sized ceramic panel piece in the upper region in the fume tube, the work of lifting the ceramic panel piece to a predetermined position can be easily performed, and when an adhesive is used for fixing. The panel pieces can be held until the adhesive hardens without the need for holding means. By disposing a relatively large-sized ceramic panel piece in the lower area, a wide range of coating work can be performed at once, and even if the bonding is performed only with the adhesive, the mass of the panel piece is reduced in the direction of the bonding. Therefore, it is not necessary to hold the panel pieces until the adhesive is solidified.
[0039]
The ceramic panel pieces 4 may be of the same size and may be laid out in rows and columns, or may be laid out in random combinations of different sizes.
In this case, for example, the panels may be spread while being shifted from each other by half of the panel piece width dimension and / or half of the length dimension.
[0040]
In any case, it is necessary that the adjacent ceramic panel pieces are made in a state where their edges are in close contact with each other. In some cases, the joint portion may be filled with a putty-like filling containing a ceramic material powder.
[0041]
The edge of the ceramic panel piece 4 preferably has a shape in which adjacent panel pieces are joined complementarily. 4 to 6 show examples of complementary edge shapes.
[0042]
In the panel piece shown in FIGS. 4 and 5, two edges extending in a direction parallel to the axis of the fume tube are formed in a step shape, and a step 4a of one of the edges protrudes in the circumferential direction on the inner peripheral side. On the other hand, the step portion 4b of the other edge portion protrudes in the circumferential direction on the outer peripheral side, and when the protruding portions of the one edge portion and the other edge portion are overlapped with each other, they are in a state of "going together" or "phased out". In addition, the thickness is the same as the thickness of the panel piece main body.
[0043]
The panel piece shown in FIG. 6 also has a step at the edge similarly, but in this example, a combination of three types of panel pieces having different edge shapes is used. Panel pieces 4 _1, shown in the top part, has a step portion the outer peripheral side protrudes in the circumferential direction of the edges of both panels following the left and right of the top panel piece 4 ₁ illustrated state The pieces 4 ₂ , 4 _3, ... Protrude in the circumferential direction on one side of the top panel so as to complement the one edge of the top panel, and conversely, on the other side edge, protrude in the circumferential direction on the other side.
[0044]
In addition to the examples shown, complementary edge configurations can be implemented in various ways. For example, instead of providing a step at the edge as described above, a groove is formed in one edge in the length direction, and the other edge is fitted in the groove in the length direction. In this case, a so-called tongue-and-groove complementary joint can be formed by forming a convex ridge and fitting the groove of the adjacent panel piece and the convex ridge to each other. In addition, the edge of the panel piece adjacent in the circumferential direction of the fume tube may have a complementary joint shape, and the edge of the panel piece adjacent in the axial direction of the fume tube may have the same complementary joint shape. It may be only.
[0045]
Further, as shown in FIGS. 7 and 8, a male projection 4d is provided on one or two sides as a complementary edge structure, and the male projection 4d is fitted on the other one or two sides in a puzzle manner. A configuration in which a female groove 4e having a shape corresponding to the male protrusion is provided as possible is possible.
[0046]
The ceramic panel piece 4 may be hexagonal as shown in FIG. 9, or may be another polygonal shape.
[0047]
After the step of cutting and deleting the deteriorated portion 2, it is preferable to apply a liquid agent that provides protection and strengthening of the inside of the concrete and a water stopping function to the undegraded concrete surface 1 a prior to the fixing of the ceramic panel piece 4. The application is preferably performed by spraying a liquid agent on the undegraded concrete surface 1a. The application by spraying can be performed simultaneously with the appearance of the undegraded concrete surface 1a by a spraying device installed in the cutting machine or cooperating with the cutting machine, so that work can be performed efficiently. It is.
[0048]
As this liquid agent, those commercially available under the trade name of “Protecrete CDS” are preferable. The Protecrete CDS is colloidal amorphous silica in which ultrafine silicon dioxide particles are dispersed and suspended in water. Due to its ultra-fine molecular weight, it has the property of penetrating into all places where water passes, and when injected at high pressure onto a concrete surface, permeates into aged concrete to a depth of about 10 to 15 cm. The permeated ultra-fine colloidal silica reacts instantly with calcium hydroxide, which is a cause of deterioration of concrete generated by the hydration reaction of cement, and functions to decompose into calcium silicate and water. By this reaction, the silica gel modified to be 100% insoluble solid densifies and integrates the concrete structure while maintaining the air permeability, thereby enhancing the protection inside the concrete and preventing water from deteriorating, further preventing corrosion and preventing deterioration. It also brings functionality.
[0049]
It is preferable to provide the above liquid agent with a water repellent function, whereby the undegraded concrete surface coated with the liquid agent becomes hydrophobic, so that microorganisms are unlikely to survive, and therefore, a situation where corrosion by microorganisms does not easily occur is easily achieved. It is possible to create.
[0050]
The ceramic panel pieces can be made of various materials. About 30% of sewage sludge incineration ash (polymer), about 35% of ceramic finely pulverized product (for example, tile chamotte), and about 35% of clay (clay) In this case, about 65% of the total raw material becomes a recycled product and a high recycling rate product.
[0051]
【The invention's effect】
According to the method of the present invention, as described above, even if it is an existing fume tube, or a large-diameter fume tube in which it is difficult to protect the inner peripheral surface with a resin, the inner wall surface deterioration progress prevention process can be easily performed. As a result, the effect is obtained that the existing fume tube treated by the method of the present invention can maintain its function for a long time.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view of a fume tube illustrating steps of the method of the present invention.
FIG. 2 is a view showing an example of means for fixing a ceramic panel piece to an inner peripheral surface of an existing fume tube.
FIG. 3 is a view showing a state in which a ceramic panel piece is fixed to the inner peripheral surface of the fume tube using the means shown in FIG. 2;
FIG. 4 is a schematic cross-sectional view similar to FIG. 1, showing an example of a configuration of one edge portion of a ceramic panel.
FIG. 5 is a perspective view of the ceramic panel piece shown in FIG. 4;
FIG. 6 is a schematic cross-sectional view similar to FIG. 4, showing another example of the configuration of one edge portion of the ceramic panel.
FIG. 7 is a perspective view showing another example of the configuration of the ceramic panel piece.
FIG. 8 is a perspective view showing still another example of the configuration of the ceramic panel piece.
FIG. 9 is a perspective view showing still another example of the configuration of the ceramic panel piece.
[Explanation of symbols]
1 ... Hume pipe 1a ... undegraded concrete surface 2 ... degraded portion 3 ... cutter 3a ... cutter 3b ... arm members _{4 1,} 4 _{2, 4} 3 ... Ceramic panel pieces 4a, 4b Step 4c Depression 5 Anchor bolt 5a Base 5b of anchor bolt Male screw 6 of anchor bolt 6 Nut

Claims (7)

The non-deteriorated concrete surface of the fume pipe inner wall is covered with the ceramic panel pieces of a predetermined size having a curve along the curved surface in close contact with each other and the non-deteriorated concrete surface, and sequentially laid to cover the non-deteriorated concrete surface. A method for protecting an inner wall surface of a fume tube, characterized in that: The inner wall of the existing concrete culvert is uniformly cut and removed over the entire inner wall up to the depth range where the deteriorated portion is completely removed, so that the undegraded concrete surface appears,
The exposed undegraded concrete surface is covered by successively laying down ceramic panel pieces of a predetermined size having a curved shape along the curved surface and tightly fixed to each other and to the undegraded concrete surface. How to protect the inner wall of concrete pipes. The method for protecting an inner wall surface of a concrete pipe according to claim 1 or 2, wherein the ceramic panel piece is fixedly adhered to the undegraded concrete surface by adhesion with an adhesive. After cutting and removing the deteriorated portion, anchor bolts are attached to the concrete pipe from the undegraded concrete surface side at predetermined intervals in a circumferential direction and an axial direction, and the male screw portion of the anchor bolt is undegraded. Project from the concrete surface,
An insertion hole provided in the thickness direction of each of the ceramic panel pieces is fitted into the male screw part, and the tip of the male screw part is projected from the ceramic panel piece,
The inner wall surface protection of a concrete sewer according to claim 1 or 2, wherein a nut is screwed into a tip portion of the male screw portion and tightened to fix a ceramic panel piece to the undegraded concrete surface. Method. The method for protecting the inner wall surface of a concrete pipe according to any one of claims 1 to 4, wherein the adjacent ceramic panel pieces are joined by complementary edge shapes. 6. A liquid agent for enhancing the protection inside the concrete and waterproofing the inside of the undegraded concrete surface prior to the fixing of the ceramic panel pieces after the removal of the deteriorated portion by cutting. The method for protecting an inner wall surface of a concrete pipe according to any one of the above. The ceramic panel piece is a porcelain product fired using about 30% of sewage sludge incineration ash, about 35% of porcelain crushed material, and about 35% of porcelain clay. 7. The method for protecting an inner wall surface of a concrete pipe according to any one of claims 6 to 6.

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