JPH0996396A - Worn part repairing method of air transport pipe line of solid matter and complex for repairing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To regenerate an unsymmetrically worn part simply and safely, by welding an auxiliary frame to the peripheral edge of an opening formed by cutting the unsymmetrically worn curved surface of a pipe member, and installing allowable to connect and disconnect a complex for repairing made by fastening a protective cover, a buffer, and a high anti-wear ceiling linear with the same curved surface, to the auxiliary frame. SOLUTION: An auxiliary frame 3 is welded to the periphery of an opening 2 formed by cutting the unsymmetrically worn area of a pipe member 1, in a picture frame form. A complex 4 for repairing of a curved plate body to cover the opening 2 is installed on the auxiliary frame 3. The outermost surface of the complex 4 is a protective cover 41 made by formation processing an iron plate, and a fastening bolt 31 to install the protective cover 41 is welded beforehand on the surface of the auxiliary frame 3. A buffer 42 is attached on the inner surface of the cover 41, and a vibration-proof rubber material is suitable for the buffer 42. Furthermore, a ceiling liner 43 of a high abrasive material is attached on the inner surface, and a high Cr cast iron is suitable to the liner 43. The tip surface of the head 45 of a bolt 44 to fasten the buffer 42, the cover 41, and the liner 43 has the curved surface same as the liner 43, and the same material as the the liner 43. The regenerated inner surface has no difference in level, the flow is smooth, and its installing work can be carried out from the outer side of the pipe.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a repairing method associated with wear of a pipeline that is used to pneumatically transport solid matters such as municipal solid waste, and a repairing complex effectively used in that case.

[0002]

2. Description of the Related Art In recent years, a method of pneumatically transporting solid materials has been applied to various fields such as industrial and mining equipment and household waste collection in cities, and its range is rapidly expanding. The tendency is remarkable. In the industrial and mining industries, mineral processing and its transportation, coal burning power plant, gas, electricity, kiln, chemical, chemical, food, metal refining, dredging, etc. The applicability and function of the device are highly evaluated to such an extent that the economical operation of the device is uncertain.

On the other hand, regarding the collection of garbage discharged from households in residential areas in urban areas, garbage trucks have conventionally circulated and collected the garbage, but the garbage is piled up on the road and waits before collection. Therefore, it cannot be said to be in a favorable state in terms of environment and aesthetics of the city. Therefore, by specifying some model areas, a pipe is connected from the inlet provided in the building such as an apartment house that is the source of household waste to the collection center, and the blower provided at the collection center side is operated and input. A method is provided in which the collected dust is transported by sucking it along with the air flow, and it is well received for its effect on environmental improvement and labor saving.

In air transportation, solid substances such as dust pass through the pipe together with air, so that it is essentially unavoidable that the inner surface of the pipe faces a wear phenomenon due to rubbing with the solid. Moreover, the pipeline is not necessarily laid in a straight line, but rather it is a normal mode to bend the pipeline to reach the destination. In this bent portion, the flow direction of the solid matter that flows with the air is turned, so that the inner surface of the pipe is particularly worn out, and the uneven wear causes the pipe body to be partially worn and the hole penetrates. Cause the accident that spouts.

Among the air transportation pipelines, the one in which the uneven wear phenomenon is particularly severe is the inner surface on the outer peripheral side in the bending radius direction of the curved pipe interposed in the pipeline. Many proposals have heretofore been made for enhancing the wear resistance, focusing on the improvement corresponding to the wear of this portion. The proposals are roughly classified as follows. The entire curved pipe is made of highly wear resistant material. For example, high Cr
Use a cast iron bent tube. The thicker the portion of the curved pipe where uneven wear is severe, the thicker the wall. (For example, Japanese Examined Patent Publication No. 7-43066) A storage chamber 101 that is open to the outside in the uneven wear portion of the curved pipe 1a.
And a liner made of a wear-resistant elastic material are housed in a compressed state, and the lid 102 is detachably attached, and the wear block with ceramic lining is replaced. Japanese Utility Model Laid-Open No. Sho 63-150192 mounted as possible. Japanese Utility Model Laid-Open No. 63-173593 in which a tile layer is attached to the outside of the uneven wear portion and a synthetic resin layer is coated on the outside thereof. Similarly, Japanese Patent Application Laid-Open No. 4-337193, in which a wear resistant material is attached to the outside of the curved pipe with an adhesive or the like. Japanese Utility Model Laid-Open No. 60-62696 and Japanese Utility Model Laid-Open No. 4-23899, which are liner liners having a convex portion and a concave portion that are divided into wear areas and are attached to each other and are fitted to each other. Etc. are found.

[0006]

It can be evaluated as described in the specification that the above-mentioned many prior arts have characteristics and are effective as measures against uneven wear. However, among these, regarding the conventional technology of manufacturing the entire curved pipe with a wear resistant material, no matter how high the wear resistance is, as long as it faces abrasion with a solid material, even if there is a difference in service life, It is a self-evident reason that wear will progress and the day will have to be renewed, and it is not a fundamental solution because the complicated work of removing it from the pipeline and replacing it is forced. In addition, since materials with high wear resistance are also highly brittle, the larger the curved pipe, the more difficult it becomes to technically manufacture a cast product. Not applicable to the road. With respect to this point, the prior art for increasing the thickness of a part of the uneven wear portion is also the same.

The other prior arts are the same in that a liner or the like made of a highly wear-resistant material is attached, and occupy most of the prior arts. This is a method in which a liner of another material is attached to the outside or the inside. When a liner is attached to the outer peripheral surface, the pipe itself is locally worn and worn down, and the liner on the outside of the pipe maintains the pipe line. Since the unevenly worn portion forms a recess in the pipeline to create a step, solid matter in the flow is caught on the step to obstruct the flow, and sometimes the trouble of blocking the effective cross section of the pipeline occurs. Also, if the liner exposed on the worn surface wears, it is necessary to replenish the original attachment surface (outer peripheral surface of the pipe body) with the liner material and regenerate it into the original shape so that the worker does not infiltrate into the pipeline. As far as it is done from outside the tube, it is unlikely that it will be so easy. On the other hand, even in the case where a liner made of a wear resistant material is attached to the inside of the pipe, the phenomenon that the solid matter is caught because the end face of the liner itself forms a step is likely to be induced. This also leaves one of the problems because the complicated work of sneaking into the pipe is forced to replace the liner later.

As described above, many conventional techniques have their respective problems, and the work is troublesome and it is not economically advantageous. Therefore, the merit is not recognized when the technique is carried out, and eventually, As a countermeasure against uneven wear of the air transport pipe, a patch plate as before, where most of the pipelines cut off the periphery of the through hole torn by uneven wear and apply a steel plate from the outside to weld it In reality, many people have no choice but to rely on the method. SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for repairing a worn portion of an air transportation pipe which solves the above problems and realizes a relatively simple and safe regeneration of an uneven wear portion, and a repair composite 4 used in the method. .

[0009]

According to the method for repairing wear of a solid air transportation pipe according to the present invention, an unevenly worn curved surface of a pipe member is cut, and an auxiliary frame is welded and fixed along the periphery of the cut opening. Then, a repair composite in which a protective cover and a highly wear-resistant lining liner, which is attached to the protective frame with a cushioning material interposed therebetween and forms the same curved surface as the curved surface before opening, is fastened. It consists of a detachably attached procedure. By this procedure, the part where uneven wear has advanced is relatively easily repaired from the outside of the pipe, and the inner surface at the same level as the original inner peripheral surface of the pipe is regenerated, so that the phenomenon of solid matter flowing inside is avoided. To be done. Moreover, since the new inner surface that has been replaced has high wear resistance, it maintains a long service life despite facing the condition where uneven wear concentrates more than other parts, and if wear progresses again during use, If the repairing composite is removed from the auxiliary frame and the interior liner liner is renewed and installed, the wear resistance and shape are restored to the original state and all the problems of the prior art are solved.

Instead of cutting off the uneven wear portion in this procedure, the auxiliary frame is welded and fixed along the peripheral edge of the opening formed by notching the uneven wear portion which is predicted empirically in advance, and on the auxiliary frame. If the procedure of mounting the pipe member to which the repair composite is detachably attached to the repair composite from the initial installation of the pipeline is adopted, the range of uneven wear expected from the initial installation of the pipeline is high. A wear-resistant material can be used, and when uneven wear progresses due to subsequent use, an auxiliary frame has already been formed in the opening.Therefore, a simple work of replacing the repair complex at the site can be used at the time of installation. It is more effective in solving the problems because the same pipeline as that of the new product is regenerated.

The member used for solving the problem is that the auxiliary frame 3 is welded and fixed along the periphery of the opening 2 in which the uneven wear portion of the pipe member 1 is cut off, and the auxiliary frame 3 is put on and detached. It is the repair composite 4 to be fastened, the protective cover 41 covering the entire opening 2 and screwed to the auxiliary frame 3 at the periphery, the cushioning material 42 attached to the inner surface side of the protective cover 41, and the cushioning material. Four
It is characterized in that it is formed by an inner liner 43 made of a high abrasion resistant material that is attached to the inner surface side of 2 and is fastened to the protective cover 41. With this configuration, the repair composite 4 can be integrally fastened to the auxiliary frame 3 from the outside of the pipe, so that the repair composite 4 can be applied to a place where uneven wear is severe, and even if it is forced to be replaced frequently, it can be replaced much more than the conventional technique. The burden of work is reduced, and it becomes a decisive factor in problem solving.

The repair composite 4 has a structure in which a highly wear-resistant lining liner 43 is exposed at a portion facing uneven wear, and a cushioning material such as rubber is attached to the back surface of the lining liner 43 and further fastened with a protective cover 41. Therefore, the high-hardness lining liner 43 and the metal protective cover 41 do not come into direct contact with each other, and the lining liner 43 has a weak point that it is brittle instead of hard, so that the lining liner 43 cracks due to impact or imbalanced pressing force. It prevents the occurrence of accidents, breakage, and dropouts, thus providing an effective cushioning action that helps solve problems from the side.

Among the constitutions of the repair composite 4, especially the fastening bolt 4 for fastening the lining liner 43 to the protective cover 41.
It is desirable that 4 has a head portion 45 having a curved surface that matches the curvature of the lining liner 43, and that the material of the head portion 45 is made of the same high wear resistance material as the lining liner 43. Since the surface of the fastening bolt has the same high wear resistance as the lining liner 43, and the curved surface of the head forms the same level as the curved surface of the lining liner 43, which is continuous.
It is a strong factor in solving the problem by preventing the local wear, which has hitherto been concentrated on the fastening bolts.

The lining liner 43, which is the inner layer of the repair composite 4, is divided into a weight that can be manually carried by an operator, for example, 20 to 30 kg, and the protective cover 4 is divided.
It is desirable that it is attached to the No. 1 unit. That is, if the lining liner 43 is divided into a size and weight that can be manually arranged on the protective cover 41 at the site of repairing the pipeline, the work is easy even if the repair range of the opening is somewhat large. In addition, since the lining liner 43 has high wear resistance, it is generally high in hardness, and it is better to divide the liner 43 into a plurality of pieces and juxtapose them on the protective cover 41 without causing a risk of cracking or breaking even when an impact is applied. It is desirable to prevent falling.

It is highly desirable that both the lining liner 43 and the head portion 45 of the fastening bolt described above are made of high Cr cast iron. By selecting this material, it is easy to manufacture the lining liner 43 and to attach it to the protective cover 41, and the manufacturing cost is relatively low compared to its high abrasion resistance, which is economical in practice. Great advantage. For almost all of the conventional techniques, it can be speculated that the economic burden of the material cost and the construction cost may be a major obstacle to implementation. Therefore, the material selection and high function of the present invention are important for solving the problem. It will be one of the elements.

[0016]

1 is a vertical sectional front view showing an embodiment of the present invention, and FIG. 2 is a partially sectional front view conceptually illustrating the entire curved pipe interposed in a pipe line (fastening bolt). Omitted)
It is. In both figures, the auxiliary frame 3 is welded and fixed in the shape of a frame to the periphery of the opening 2 that is cut out from the region of the pipe member 1 (in this case, a curved pipe) where uneven wear has progressed. However, since it is usual to predict the position and degree of uneven wear peculiar to the pipe member from the beginning of the installation of the pipe installed in the pipe line as in the case of claim 2, the opening 2 is punched from the beginning to form the auxiliary frame. It is also a desirable mode to have a structure in which 3 is fixed.

The curved plate body which is mounted on the auxiliary frame 3 and covers the opening 2 entirely is the repair composite body 4, and the outermost surface thereof is the protective cover 41 produced by forming an iron plate. It is the fastening bolt 31 that attaches the protective cover 41 to the auxiliary frame 3, and it is convenient in terms of work to weld the fastening bolt 31 to the surface of the frame-shaped auxiliary frame 3 in advance at an equal rate. A buffer material 42 is attached to the inner surface of the protective cover 41, and is preferably made of a vibration-proof rubber material. Attached to the inner surface of the cushioning material 42 is a lining liner 43 made of a highly wear-resistant material, and as a material, high Cr cast iron is economically advantageous, and particularly in the case of cast iron containing 27% Cr, cementite is used. It is worth recommending because the complex carbide of chrome carbide and chrome carbide forms a matrix, and the abrasion resistance brought about by the extremely high hardness is well-established. Cushioning material 42
The protective cover 41 and the lining liner 43 are fastened to each other with the head cover 45 having the same curvature as the lining liner 43, and the material is the same as that of the lining liner 43. In other words, it is desirable that 27% Cr cast iron is first formed of high Cr cast iron and the threaded portion is made of steel. However, the material of the lining liner 43 is not limited to any kind as long as it is a material having high wear resistance, such as high manganese cast steel, Ni-Cr, Cr-M.
Various alloy steels such as o, Cr-Ti, nitrided steel, carburized steel,
In addition to induction hardened steel and sintered alloys, non-metal bodies such as ceramic materials can also be targeted.

[0018]

FIG. 3 is an enlarged front sectional view showing the essential parts of an embodiment of the present invention. In the figure, the pipe member 1 has an outer diameter 508.
mm, wall thickness 15.1 mm, JIS standard 500 A steel pipe, and the auxiliary frame 3 welded and fixed around the opening 2 has a width of 60 mm.
mm, thickness 12 mm SS400 plate. The fastening bolt 31 for attaching and detaching the protective cover 41 and the auxiliary frame 3 is M16.
The bolts are evenly arranged and planted on the surface of the frame-shaped auxiliary frame 3. The protective cover 41 has an S thickness of 7.9 mm.
It is made of S material, and a rubber material (NBR) having a thickness of 3 mm is interposed between the auxiliary frame 3 and the protective cover 41. A rubber material (NBR) having a thickness of 5 mm is interposed as a cushioning material 42 between the protective cover 41 and the lining liner 43. The lining liner 43 has a wall thickness of 25 mm and its surface is at the same level as the inner peripheral surface of the pipe member 1. It is a 27% Cr cast iron in which curved surfaces are continuously formed. The head 45 of the fastening bolt 44 between the lining liner 43 and the protective cover 41 is also made of 27% Cr cast iron. Silicone resin is poured into the fastening portions of both fastening bolts 31 and 44 from the outside of the pipe to seal compressed air from the fastening portions so as not to leak outside.

FIGS. 4A, 4B and 4C are views showing an example of the divided lining liner 43. Nine lining liners 43 are divided in the repair composite 4 covering the opening. The lining liner 43 has a length of 413 mm, the width of the curved surface (arc length) is 207 mm, the total length is 1238.8 mm, and the total width is 627 mm. Is forming. In addition,
The unit weight of the liner 43 of this embodiment is about 15 kg.
It is very popular because it is extremely convenient and easy to handle during construction.

[0020]

As described above, according to the present invention, regardless of the diameter of the air transport pipe, only the worn portion is cut off from the outside of the pipe and the repair composite is attached to the same level at the beginning of installation. Regenerate the inside. Since there is no step or recess on the regenerated inner surface, there is no concern that the solid matter passing through the pipeline will be caught or partly blocked by locking in the pipeline, and the smooth flow of solid matter will continue. Will be a factor.

In addition, all the mounting work can be performed from outside the pipe, and even if the target pipe body is large, there is no particular limitation, so it can be applied to all cases. It goes without saying that the regenerated inner surface has a high wear resistance, which leads to extension of the service life in the subsequent use.

When the position and degree of uneven wear are predicted in advance as in claim 2, if a pipe member in which the range is replaced with a repair composite is adopted from the beginning of the pipe laying, the service life will be further improved. Is effective for extension of. Generally, the properties, flow rates, flow velocities, etc. of solids passing through the pipeline are numerical values specific to the pipeline, and the relationship between the pipe member that matches the usage conditions and the predicted uneven wear is calculated in advance. Since standardization is possible from the beginning, it is irreversibly convenient for laying work and subsequent maintenance of pipelines by systematically setting special specifications with repair composites attached to all pipe members. Can bring

The repair composite is integrally formed as in claim 3, and in addition to this, the lining liner and the fastening bolt head are continuous with the inner surface of another pipe member as in claim 4. By maintaining the same level as described above, the abrasion due to the rubbing of solid matter progresses evenly, and the effect of avoiding extreme local abrasion is enhanced. Moreover, since the cushioning material is interposed between the lining liner and the rear cover, the effect of absorbing the shock and vibration applied to the high-hardness lining liner and preventing the occurrence of cracks is provided.

If the lining liner of the repair composite is attached in a divided state as claimed in claim 5, the weight of the lining liner alone can be reduced, and the worker can easily arrange and fasten it by hand. Therefore, it can be applied to all the pipelines without being restricted by the increase in the size of the tubular body. Since the process of attaching the liner liner can be carried out at any place outside the pipeline, it is possible to obtain an effect that is superior to the conventional art in terms of improvement of workability and work safety. Further, if the repair composite to which the inner liner is previously attached as described above is standardized and stored in a factory or on site for standby, higher work efficiency can be obtained.

[Brief description of drawings]

FIG. 1 shows a vertical sectional front view of an embodiment of the present invention.

FIG. 2 is a front view of a partial cross-section showing the entire configuration.

FIG. 3 is an enlarged front sectional view showing a main part of the embodiment of the present invention.

FIG. 4 is a plan view (A) and FIG. (A) showing an embodiment of the present invention.
FIG. 3B is a view (B) taken along the line XX in FIG. 7B and is a layout diagram (C) of the lining liner taken along the line YY in FIG.

FIG. 5 is a perspective view showing an example of a conventional technique.

[Explanation of symbols]

 1 Pipe member (curved pipe) 2 Opening 3 Auxiliary frame 4 Repair complex 31 Fastening bolt 41 Protective cover 42 Cushioning material 43 Lining liner 44 Fastening bolt 45 Head

Claims (6)

[Claims] 1. A method for repairing a worn portion of a solid air transportation pipeline, in which a curved surface of the tubular member 1 that has undergone uneven wear is cut, and an auxiliary frame 3 is welded and fixed along the periphery of the cut opening 2. For repair, a protective cover 41 and a highly wear-resistant lining liner 43, which is attached to the auxiliary frame 3 with a cushioning material 42 therebetween and forms the same curved surface as the curved surface before opening, are fixed. A method for repairing a wear part of a solid air transportation pipeline, characterized in that the composite body 4 is detachably attached. 2. The auxiliary frame 3 is welded and fixed along the periphery of an opening formed by cutting out an empirically predicted uneven wear portion in advance, instead of cutting off the uneven wear portion in claim 1. A method for repairing a worn portion of a solid air transportation pipeline, characterized in that the tubular member 1 to which the repair composite 4 is detachably mounted on the auxiliary frame is mounted from the beginning of laying the pipeline. 3. A repair composite body in which an auxiliary frame (3) is welded and fixed along the periphery of a square-shaped opening (2) in which the uneven wear portion of the pipe member (1) is cut off, and the auxiliary frame (3) is detachably fastened. 4 is
A protective cover 41 that covers the entire opening 2 and is screwed onto the auxiliary frame 3 at the periphery, a cushioning material 42 attached to the inner surface side of the protective cover 41, and a protective cover 41 attached to the inner surface side of the cushioning material 42. Liner 4 made of high wear resistant material
3. A composite for repairing a pneumatic transportation line of a solid material, which is formed by 4. A fastening bolt 44 for fastening the lining liner 43 to the protective cover 41 according to claim 3, has a head portion 45 having a curved surface that matches the curvature of the lining liner 43, and A composite body for repairing a pneumatic transportation line of a solid material, which is made of a material having the same high abrasion resistance as that of the lining liner 43. 5. A composite for repairing an air transportation pipeline for a solid material, characterized in that the lining liner 43 according to claim 3 or 4 is attached to the protective cover 41 by dividing it into a weight that can be manually transported. body. 6. The repair of a solid pneumatic transportation line according to any one of claims 3 to 5, characterized in that both the lining liner 43 and the head portion 45 of the fastening bolt are made of high Cr cast iron. Complex.