JP4540131B1 - Method of inspecting and repairing the inner wall of concrete silobin - Google Patents

Abstract

An object of the present invention is to develop an inspection method capable of identifying a damaged portion in repairing an inner wall of a concrete silobin, and to develop a method capable of intensively repairing only that portion. The inspection method and the repair method are closely linked so that the airtight state of the silobin can be finally maintained at the original grade.
The inside of the silobin is decompressed, soap water is applied to the inner wall to create a developed view in which the damaged portion is marked, and the damaged portion is intensively airtightly repaired, and then the inner wall is fully lined. Next, an airtight test for maintaining the rated pressure is performed. If it is maintained, the process is terminated. If not, the process returns to the decompression check.
[Selection] Figure 1

Description

The present invention relates to a method for inspecting and repairing an inner wall of a concrete silobin that mainly stores grains and the like, and more particularly to a method for inspecting and repairing an inner wall of a concrete silobin having the following configuration. It is.
<Method 1>
In the inspection method for repairing the inner wall of concrete silobin,
A preparatory step for performing a decompression check;
A method for inspecting an inner wall of a concrete silobin, characterized by comprising a depressurization check step of depressurizing the inside of the silobin and checking a critical repair location.
<Method 2>
After carrying out the method for inspecting the inner wall of the concrete silobin described in Method 1 and completing all the steps for inspecting the inner wall of the silobin,
A step of performing airtight repair on the important repair location of the inner wall of the silobin;
A step of performing an airtight test after the airtight repair,
A pressure determination step for returning to the pressure reduction check step described in Method 1 if the pressure is not maintained above the rating in the airtight test;
If the pressure is maintained above the rating in the pressure judgment step, post-processing is performed to complete the work,
A method for repairing the inner wall of a concrete silobin, characterized by comprising:
<Method 3>
The step of preparing in advance for performing the decompression check according to the method 1,
Emptying the inside of the silobin;
Removing the silobin attachment,
Constructing work scaffolds inside the silobin;
Cleaning the inside of the silobin and discharging the dust;
A step of sealing and curing the hopper portion of the silobin;
Washing the inner wall of the silobin with high pressure water;
And
The decompression check step of depressurizing the inside of the silobin described in Method 1 to check the critical repair location,
Sealing the silobin;
Depressurizing the interior of the silobin to -200 millimeters to -600 millimeters with a water manometer;
Applying soapy water to the inner wall of the silobin;
Marking the damaged part of the inner wall of the silobin;
The step of recording the damage on the development and photo,
A method for inspecting an inner wall of a concrete silobin characterized by comprising:
<Method 4>
The step of performing an airtight repair on the important repair site of the inner wall of the silobin described in Method 2,
A step of determining a repair specification from the above development and photograph;
A step of performing intensive repairs on the parts marked on the development view,
Washing the entire inner wall of the silobin with high pressure water again,
Drying the interior of the silobin;
Lining the entire inner wall of the silobin;
And
A step of performing an airtight test after the airtight repair described in Method 2;
Sealing the silobin;
Pressurizing the interior of the silobin;
It is determined whether or not the internal pressure of the silobin is maintained above the rated value. If the internal pressure of the silobin is maintained above the rated value, the process proceeds to the next step. Pressure judgment step to return to the decompression check step to depressurize the inside and check the critical repair location,
And
If the pressure described in Method 2 is maintained above the rating, the post-processing is performed, and the step of completing the operation is performed.
Removing working scaffolds and curing,
Attaching the silobin accessories,
Cleaning the inside of the silobin,
A method for repairing the inner wall of a concrete silobin, characterized by comprising:
<Method 5>
It is determined whether or not the internal pressure of the silobin described in the method 4 is maintained above the rated value. If the internal pressure of the silobin is maintained above the rated value, the process proceeds to the next. In the step of pressure judgment returning to the decompression check step of depressurizing the inside of the silobin and checking the important repair location, the rated pressure is a water manometer and the water column height is 200 mm. How to repair the inner wall.
<Method 6>
It is determined whether or not the internal pressure of the silobin described in the method 4 is maintained above the rated value. If the internal pressure of the silobin is maintained above the rated value, the process proceeds to the next. In the pressure judgment step that returns to the decompression check step of depressurizing the inside of the silobin and checking the critical repair location, the rated pressure is a water manometer and the water column height is 400 mm. How to repair the inner wall.

  Traditionally, silos for grain silos were often made of reinforced concrete. Pressure is applied to the inner wall of such concrete silobin due to the weight of accumulated grains and filling with fumigation gas, and there is also deterioration of concrete due to secular change. It was inevitable that holes were generated and the airtightness deteriorated. If the airtightness deteriorates, many harmful effects such as allowing intrusion of outside air and increasing the leakage of fumigation gas will occur, so the inside of the silobin is periodically emptied and the damaged part is repaired. It is necessary to maintain the inner wall to withstand the rated pressure. Here, the term “junker” refers to a state in which the surface of the concrete is peeled off and the base material is exposed.

  The rated pressure (rated pressure resistance) of silo for grain silo is regulated by the Ministry of Agriculture, Forestry and Fisheries / Plant Quarantine Station, and according to this, the air column is blown and the water column height is set to 500 mm with a water manometer. The case where it is possible to confirm that the height of the water column is 20 mm or more and less than 400 mm after stopping air blowing and that it can be confirmed that it is 400 mm or more is defined as the special class A. For details, see Non-Patent Document 1 below.

  There are four categories of grades, A, A, B, and C, but the current silo bins for grain silos are mostly built in the special A grade or A grade category. The reason for this is that the permissible amount of fumigation gas leakage increases as the grade decreases. In other words, according to the provisions of the Ministry of Agriculture, Forestry and Fisheries / Plant Protection Station, the residual gas rate after 48 hours when using 10 grams of methyl bromide per cubic meter of air silo is 85% or more for Special Class A and 70% for Class A As described above, 55% or more is defined for Class B and 40% or more for Class C (see Non-Patent Document 1 below).

  The fact that the amount of fumigation gas leaked is high, which means that the amount of gas used during fumigation increases and costs increase. In addition, the fumigation gas is toxic, so if the amount of leakage is large, the effect on the surrounding environment will be large. In many cases, the trading company is responsible for the fumigation gas expenses. However, as a trading company, if it is a silo in the same place, it will not adversely affect the surrounding area from the viewpoint of cost saving. There is a strong tendency to put their cereals in higher silos. Therefore, lower grade silos will not be used. From these points, there are almost no C-class silos, there are very few B grades, and there are many A grades and special A grades. In particular, when a new silo is to be constructed, it is common today to be built in a special A class category.

  If a concrete silobin made to meet the requirements of Special Class A, if the amount of fumigation gas leakage increases due to secular change, it may be downgraded to Class A or Class B. Such cases are rare. This is because once a special fumigation facility is registered as a special class A, changing the class is very difficult to process. The same is true when class A is changed to class B or lower and class B is changed to class C. In addition, as mentioned above, recently, there is a tendency to favor the higher grades of silobin, so it is not possible to lower the grade of silobin from this point. Therefore, it becomes necessary to stop using the silobin which has been out of the original grade due to the secular change and the amount of fumigation gas leaked, repair the inner wall, and return to the original grade. In view of this, various attempts have been made to repair the inner wall of concrete silobin.

  The above-mentioned repair is mainly required for concrete silobin, and in metal silobin using iron, stainless steel, etc., there is almost no situation that the amount of fumigation gas leakage increases due to secular change. Does not happen. Therefore, recently built silobin is mainly made of metal. However, many concrete silobins built in the past are still in active operation, and in such silos, the development of a rational repair method for the inner wall has become an urgent issue.

  Conventionally, as a method for repairing the inner wall of a concrete silobin, the method of first repairing the entire inner wall by assembling a scaffold by emptying the inside of the silobin has been the main method (see Patent Document 1 below). In the method of visually checking cracks, jumpers and pinholes and repairing only that, there is a damaged part that leaks from the confirmation, eventually gas leakage can not be stopped, the silo bin is empty again and the inner wall is completely covered The result is that the repair is repeated, so even if it costs about a certain amount from the beginning, it is more economical and the repair period is shorter if it is repaired evenly over the entire surface. However, full repair of the inner wall is still a costly burden and takes a long period of time, which has been a headache for silo managers.

  In other words, if cracks, jumpers or pinholes have penetrated to the outer wall instead of staying on the inner wall, gas will leak from there, so that the entire inner wall is simply lined to prevent this gas leakage. Sorry for temporary repairs. Even if the leak is stopped once by such repair, since the fundamental improvement has not been made, the leak starts immediately and the need for re-repairing arises. Therefore, there has been no other way but to carry out a fairly thorough repair as described in Patent Document 1 below. Since there is no way to see which cracks, junkers, or pinholes penetrated by visual observation, there is no other way than to repair all the parts uniformly and thoroughly.

Patent Document 1 below discloses a fairly thorough repair method in which the entire inner wall of the silobin is covered with a molded plate and an injection agent is filled between the inner wall and the molded plate. I can say that. In this case, the damaged part of the concrete frame itself is not repaired, and it is a method of covering the entire inner wall with a molded plate while leaving the damaged part as it is. Has a disadvantage that it is reduced even slightly. In addition, no other patent documents directly related to the repair of the inner wall of the concrete silobin were found. As described above, at present, the method of complete thorough repair similar to the following Patent Document 1 is still widely used.
JP-A-9-99485

“Fumigation Warehouse Designated Guidelines” Ministry of Agriculture, Forestry and Fisheries, Plant Quarantine Station, February 6, 1969 45 Agricultural Administration No. 2628 Notification of Director of Agricultural Administration Bureau More than a dozen revisions, now on June 30, 2003, 15 production No. 2459 Partial revision

As mentioned above, the subject of this invention was set as follows.
In repairing the inner wall of concrete silobin, an inspection method that can identify the damaged part of the inner wall will be developed, and a method that can focus on repairing only that part will be developed. The above inspection method and repair method are closely linked so that the airtight state of the concrete silobin can finally be maintained at the original grade.

The present invention has been made to solve the above-described problems, and provides the following means for solving the problems.
<Solution 1>
Inspection method and repair to repair the inner wall of concrete silobin
In the repair method ,
A preparatory step for performing a decompression check;
It has a method for inspecting the inner wall of a concrete silobin, characterized by comprising a step of depressurization check that depressurizes the inside of the silobin and checks the priority repair location ,
After performing the inspection method, all the steps of the inspection of the inner wall of the silobin are completed.
After
A step of performing airtight repair on the important repair location of the inner wall of the silobin;
A step of performing an airtight test after the airtight repair,
In the airtight test, if the pressure is not maintained above the rating, the pressure judgment step returns to the decompression check step,
If the pressure is maintained above the rating in the pressure judgment step, post-processing is performed to complete the work,
A method for repairing the inner wall of a concrete silobin, characterized by comprising:
The step of preparing for the decompression check is
Emptying the inside of the silobin;
Removing the silobin attachment,
Constructing work scaffolds inside the silobin;
Cleaning the inside of the silobin and discharging the dust;
A step of performing a sealed curing in which a suction port is provided in a part of the curing curtain in the hopper portion of the silobin;
Washing the inner wall of the silobin with high pressure water;
More
Depressurization check step to depressurize the inside of the silobin and check the important repair point,
Sealing the silobin;
Depressurizing the interior of the silobin to -200 millimeters to -600 millimeters with a water manometer;
At that time, if the grade of the silobin is class A, the inside of the silobin is decompressed to an arbitrary pressure between -200 millimeters and less than -400 millimeters with a water manometer.
If the grade of silobin is special class A, the inside of the silobin is decompressed to an arbitrary pressure between -400 millimeters and -600 millimeters with a water manometer,
Applying soapy water to the inner wall of the silobin;
Marking the damaged part of the inner wall of the silobin;
The step of recording the damage on the development and photo,
More
The step of performing airtight repair on the critical repair location of the inner wall of the silobin,
A step of determining a repair specification from the above development and photograph;
A step of performing intensive repairs on the parts marked on the development view,
At that time, if the damaged part is a crack, a V-shaped cut is made on the crack line, and the periphery of the crack line is sanded to form a sander surface. The entire sander surface is impregnated with a primer resin, and further V-shaped. Filled with urethane resin in the cut shape, the first layer lining with epoxy resin is applied to the entire sander surface, the glass cloth is pasted on the surface, and the second layer lining with epoxy resin is applied over the entire surface. ,
If the damaged part is a pinhole, first, sander the periphery of the pinhole to make a sander surface, impregnate and apply primer resin, and then apply the first layer lining with epoxy resin to the entire sander surface. The second layer lining with an epoxy resin is applied to the entire surface from
If the damaged part is a jumper, first crush the concrete layer floating on the surface, and if there is a cavity in the back, inject and fill this resin with epoxy resin, and fill the recessed part with resin mortar. To a certain level, the periphery is impregnated with a primer resin, then the whole is subjected to a first layer lining with an epoxy resin, and then a second layer lining with an epoxy resin is applied to the entire surface from above,
If the damaged part is cracked between the inner wall surface and the metal part, make a V-shaped cut on the crack line, sand it around to make a sander surface, impregnate the primer resin, The V-shaped cut is filled with urethane resin, the first layer lining with epoxy resin is applied across the inner wall surface and the metal part, the glass cloth is pasted on top of it, and finally the whole with epoxy resin 2 Apply layer lining,
If there is a crack between the inner wall surface of the wall and the inner wall surface of the hopper, make a V-shaped cut on the crack line, sand it around to make a sander surface, and impregnate the primer resin Next, the urethane resin is filled in the V-shaped cut, and the first layer lining with the epoxy resin is applied across the inner wall surface of the wall body and the inner wall surface of the hopper, and a glass cloth is adhered thereon. Finally, the entire second layer of epoxy resin is applied.
Washing the entire inner wall of the silobin with high pressure water again,
Drying the interior of the silobin;
Lining the entire inner wall of the silobin using a resin for lining that satisfies the standards of food, additives, etc. notified by the Ministry of Health and Welfare,
More
The step of performing the airtight test after the airtight repair,
Sealing the silobin;
Pressurizing the interior of the silobin;
Determine whether the internal pressure of the silo bin is maintained above the rated value,
If the pressure inside the robin is maintained above the rated value, proceed to the next step. If not, depressurize the inside of the silo bin and return to the depressurization check step to check the critical repair point.
More
If the pressure is maintained above the rated value, the post-processing is performed and the step of completing the work
Removing working scaffolds and curing,
Attaching the silobin accessories,
Cleaning the inside of the silobin,
More
Determine whether the internal pressure of the silobin is maintained above the rated value. If the internal pressure of the silobin is maintained above the rated value, proceed to the next step. If not, reduce the internal pressure of the silobin. In the pressure judgment step that returns to the decompression check step for checking the priority repair location, the rated pressure is a water manometer and the water column height is 200 millimeters or 400 millimeters ,
Inspection method and repair method of the inner wall of concrete silobin .

According to the solution 1 of the present invention, in the method for inspecting the inner wall of a concrete silobin, a step of performing preliminary preparation for performing a decompression check, and a decompression check for decompressing the inside of the silobin to check a critical repair location Therefore, it is possible to pinpoint the damaged part of the inner wall of the silobin.

According to the invention of Solution 1 of the present invention, since the airtight repair step is included in the important repair location of the inner wall of the silobin, the construction period is much simpler than the method of thoroughly repairing the entire inner wall of the silobin. Is also short and inexpensive. In addition, since the damaged part is repaired with great emphasis, it is possible to maintain the grade immediately after the construction without any inferiority to the method of thoroughly repairing after repair. In particular, in the case of a method of thoroughly repairing the entire surface, the damaged portion itself is not completely repaired. From this point of view, the method of the invention of Solution 1 of the present invention is more advanced as technical content. In view of the permanentness of repair, it can be said that the method of the invention of the solution 1 of the present invention is advantageous.

Similarly, according to the invention of Solution 1 of the present invention, a step of performing an airtight test after the airtight repair, a step of determining pressure when the pressure does not reach a rating or higher in the airtight test, a step of determining pressure, and a pressure exceeding the rating Since it includes post-processing steps to complete the work when it reaches, even if it is incomplete by one repair, the leaked part can be found by the first inspection, Since it can be repaired intensively, it is possible to finally recover the silobin that maintains the airtight state that satisfies the specified grade.

According to the invention of Solution 1 of the present invention, since each step is disclosed in more detail, a person having a certain technical level can provide a very easy-to-understand guideline when implementing the present invention.

According to the invention of Solution 1 of the present invention, in the depressurization check step of depressurizing the inside of the silobin and checking the important repair site, the step of sealing the silobin, and the water column height is -200 with the water manometer inside the silobin. Depressurizing from millimeter to -600 millimeters, and if the grade of silobin is class A, the inside of the silobin is decompressed to an arbitrary pressure between -200 millimeters and less than -400 millimeters with a water manometer. If the grade of the silobin is special grade A, the step of depressurizing the inside of the silobin to an arbitrary pressure between -400 mm and -600 mm with a water manometer and applying soapy water to the inner wall of the silobin And checking and marking the damaged part of the inner wall of the silobin Since the step of recording the damaged part in the development view and the photograph is disclosed, it is possible to check the repaired part that becomes an obstacle to maintaining the airtightness required for the class A or special A class without omission. It is.

That is, in the above depressurization check step, the inside of the silobin is depressurized with a water manometer so that the water column height is -200 mm to less than -400 mm, and soap water is applied to the inner wall of the silobin, which is necessary for the class A grade Bubbles of soapy water are generated at the repair points that need to be maintained to maintain airtightness. By checking this, it is possible to leak the repair points that need to be blocked to maintain the airtightness required for the Grade A grade. It is possible to check.

Similarly, in the above depressurization check step, the inside of the silobin is depressurized with a water manometer to a water column height of −400 mm to −600 mm, and soap water is applied to the inner wall of the silobin, so that the air required for the special class A grade is obtained. Bubbles of soapy water are generated at the repair points that obstruct the maintenance of the density. By checking this, there is no need to leak the repair points that are an obstacle to maintaining the air density required for the special A grade. It is possible to check. In addition, since the decompression in which the water column height exceeds −600 millimeters may cause new damage to the inner wall of the silobin due to the decompression, the minimum pressure is set to −600 millimeters with a water manometer.

According to the solution 1 of the present invention, in the step of performing the airtight test after the airtight repair, the step of sealing the silobin, the step of pressurizing the inside of the silobin, and the internal pressure of the silobin are maintained at or above the rated value. If the internal pressure of the silo bin is maintained above the rated value, the process proceeds to the next step. If not, the internal pressure of the silo bin is reduced to return to the decompression check step for checking the priority repair location. Since the pressure determination step is disclosed, it is possible to check whether the airtight repair has been completed, and if not, return to the decompression check step.

According to the solution 1 of the present invention, since it is disclosed that the rated pressure is a water manometer and the water column height is 200 millimeters in the pressure determination step, the target silobin has a class A specified air density. It is possible to check whether or not the

According to the invention of Solution 1 of the present invention, it is disclosed that, in the pressure determination step, the rated pressure is a water manometer and the water column height is 400 millimeters. It is possible to check whether it has a density.

It is a flowchart for demonstrating the step of the inspection method and repair method of Example 1 of this invention. It is a flowchart for demonstrating the step of prior preparation in the inspection method of Example 1 of this invention. It is a flowchart for demonstrating the step of the decompression check in the inspection method of Example 1 of this invention. It is a flowchart for demonstrating the step of the airtight repair in the repair method of Example 1 of this invention. It is a flowchart for demonstrating the step of an airtight test in the repair method of Example 1 of this invention, and the post-processing step. It is longitudinal cross-sectional explanatory drawing for demonstrating plainly the structure of the target silobin in the inspection method and repair method of Example 1 of this invention. (A) It is explanatory drawing which showed the hopper part of an example of the target silobin in the cross section in order to demonstrate the inspection method and repair method of the inner wall of the silobin of invention of Example 1 of this invention. (B) It is an external appearance perspective view of the end part of the fumigation duct of an example of the target silobin, and an inlet cover in order to demonstrate the inspection method and repair method of the inner wall of the silobin of invention of Example 1 of this invention. (A) It is explanatory drawing for demonstrating the repair method of the inner wall of the silobin of invention of Example 1 of this invention. (B) It is explanatory drawing for demonstrating the repair method of the inner wall of the silobin of invention of Example 1 of this invention. (C) It is explanatory drawing for demonstrating the repair method of the inner wall of the silobin of invention of Example 1 of this invention. (D) It is explanatory drawing for demonstrating the repair method of the inner wall of the silobin of invention of Example 1 of this invention. (E) It is explanatory drawing for demonstrating the repair method of the inner wall of the silobin of invention of Example 1 of this invention. (F) It is explanatory drawing for demonstrating the repair method of the inner wall of the silobin of invention of Example 1 of this invention. (A) It is explanatory drawing for demonstrating the repair method of the inner wall of the silobin of invention of Example 1 of this invention. (B) It is explanatory drawing for demonstrating the repair method of the inner wall of the silobin of invention of Example 1 of this invention. (C) It is explanatory drawing for demonstrating the repair method of the inner wall of the silobin of invention of Example 1 of this invention. (D) It is explanatory drawing for demonstrating the repair method of the inner wall of the silobin of invention of Example 1 of this invention. (A) It is explanatory drawing for demonstrating the repair method of the inner wall of the silobin of invention of Example 1 of this invention. (B) It is explanatory drawing for demonstrating the repair method of the inner wall of the silobin of invention of Example 1 of this invention. (C) It is explanatory drawing for demonstrating the repair method of the inner wall of the silobin of invention of Example 1 of this invention. (D) It is explanatory drawing for demonstrating the repair method of the inner wall of the silobin of invention of Example 1 of this invention. (E) It is explanatory drawing for demonstrating the repair method of the inner wall of the silobin of invention of Example 1 of this invention. (F) It is explanatory drawing for demonstrating the repair method of the inner wall of the silobin of invention of Example 1 of this invention. It is an example of the expanded view created in the inspection method of Example 1 of this invention. It is an example of the process chart created in the inspection method and repair method of Example 1 of the present invention. It is an example of the investigation table | surface which shows the data of the silo airtight test (before repair) created in the repair method of Example 1 of this invention. It is an example of the investigation table | surface which shows the data of the silo airtight test (after repair) created in the repair method of Example 1 of this invention. It is a copy of the analytical test result document which proves that the epoxy resin used in the repair method of Example 1 of this invention has satisfy | filled standard standards, such as a foodstuff and an additive.

  FIG. 6 schematically shows a longitudinal section of the silo bin 1 of the silo that is the object of the method of the first embodiment of the present invention. The silobin 1 is made of reinforced concrete, and a disc-shaped lid 3 is integrally fixed to an upper end of a cylindrical wall body 2, and an upper end of a conical hopper section 4 whose diameter is reduced toward the lower end of the wall body 2. Is also fixed as a unit.

  The lid 3 is provided with a loading port 31 for loading contents such as grains at the center. Reference numeral 32 denotes a manhole through which an inspection worker enters and exits, and 33 denotes a duct hole through which the pressure adjusting duct 5 in the silobin 1 is provided. On the other hand, in the hopper part 4, a discharge port 41 for taking out stored items such as grains is provided in the central part, that is, a conical lower end part, and a manhole where workers for inspection enter and exit above the hopper part 4. 42 is provided. Further, a duct hole 43 through which the duct 6 for feeding the fumigation gas is provided is provided in the vicinity of the discharge port 41 (see FIGS. 6 and 7a).

  The duct 6 for feeding the fumigating gas is penetrated through the duct hole 43 to reach the center of the lower portion of the hopper part 4, and the gas outlet 61 is directed upward as seen in FIG. 7b. As shown in FIGS. 7a and 7b, an inlet cover 7 having a cross shape in plan view and a roof shape in cross section is installed on the upper part of the jet outlet 61, and the fumigation gas is temporarily suspended as shown by an arrow in FIG. 7b. The inlet cover 7 is configured to be dispersed in a cross shape and diffused evenly inside the silo bin 1.

  Although the structure of the silobin 1 is as above, the concrete of the wall body 2, the lid part 3, and the hopper part 4 is deteriorated due to secular change, and damaged parts such as cracks, pinholes, and jumpers are generated. It is sufficient that such a damaged portion stays only on the inner wall surface W (see FIG. 6) of the silobin 1, but when it reaches the outer wall surface WO, air in the silobin 1 leaks from there, and thus fumigation inside the silobin 1 occurs. When the working gas is injected, the gas leaks.

  8a shows a crack C1, FIG. 8d shows a pinhole P, and FIG. Further, C2 in FIG. 10a is a crack generated at the joint portion between the metal portion M and the inner wall surface W, and C3 in FIG. 10d is an inner wall surface W2 (W) of the wall body 2 and the inner wall surface W4 (W) of the hopper portion 4. The crack which arose in the joined part is shown. Normally, it is difficult to determine whether or not such a damaged portion has reached the outer wall surface WO only by viewing from the inside of the silobin 1.

<Inspection method>
The method for inspecting the inner wall of the concrete silo bin according to the first embodiment of the present invention will be described in detail. As shown in FIG. 1, the method for inspecting the inner wall of a concrete silobin according to the first embodiment of the present invention is divided into a preparatory step S <b> 1 and a decompression check step S <b> 2 performed in response to the preparatory step S <b> 1. It is.

  Details of the step S1 of the preparation are shown in FIG. As shown in FIG. 2, first, the interior of the silo bin 1 is emptied (step S11). Next, the accessory is removed (step S12). The accessory hardware is a hardware that connects the silobin 1 and the outside, such as the input duct 31a attached to the input port 31 shown in FIG. 6 and the output duct 41a attached to the output port 41. That is.

Therefore, the inlet 31 and the outlet 41 themselves, or the manholes 32 and 42, the fumigation gas duct 6, the inlet cover 7 and the like are naturally not removed even if they are hardware. Moreover, since the pressure adjusting duct 5 mounted on the lid 3 is necessary for pressurization and decompression, it is not removed. That is, the step S12 for removing the attachment hardware means that the input duct 31a and the discharge duct 41a are removed in order to isolate the silobin 1 from the surroundings in terms of airflow. A blind cover (not shown) is attached to the inlet 31 and outlet 41 from which the inlet duct 31a and the outlet duct 41a have been removed so that they can be sealed in a later step.

  Next, a working scaffold (not shown) is installed inside the silobin 1 (step S13). The work scaffold is assembled along the inner wall surface W, and is constructed so that a worker who enters the silo bin 1 can inspect the inner wall surface W of the silo bin 1 without any trouble. It should be noted that a work gondola (not shown), a lifting floor (not shown), etc. may be used instead of the work scaffold. The term “working scaffolds” includes not only normal working scaffolds, but also those that can be replaced by working scaffolds, such as working gondola and lift floor.

Next, internal cleaning and dust discharge are performed (step S14). The inside of the silo bin 1 is in an empty state with all the contents discharged, but fine grains or shells of grains are attached to the inner wall surface W. Although these are called dust, the inner wall surface W is thoroughly cleaned to drop the dust, and the dust accumulated at the bottom of the hopper 4 is discharged from the discharge port 41 of the hopper 4.

  Next, sealing curing around the outside of the hopper part 4 is performed (step S15). That is, the space S around the hopper portion 4 in FIG. 6 is surrounded by the curing curtain 8. There are two reasons for this. That is, the first reason is consideration for preventing the washing water discharged from the discharge port 41 from being scattered around in the subsequent high pressure water cleaning (step S16) inside the silobin 1, and the second reason. Is a block of airflow. A suction port 81 is provided in a part of the curing curtain 8, and a slight suction pressure is always applied to the space S by a suction device (not shown). By doing so, the dust in the space S is sucked from the suction port 81, the inside of the space S is always kept clean, and the dust generated from the silobin 1 is prevented from being scattered around.

  The airflow cut-off is as follows. That is, in step S2 of the depressurization check performed later, the inside of the silobin 1 is depressurized. At this time, the soapy water applied to the inner wall surface W of the silobin 1 slightly opens the discharge port of the hopper unit 4. Discharged. Alternatively, there is a case where an operator enters and exits by opening and closing the manhole 42 of the hopper portion 4. For this reason, in order to depressurize the inside of the silobin 1 to a constant level, an air pump (not shown) must always be in an operating state, but the space S around the hopper 4 is surrounded by the curing curtain 8. This is because the air flow is blocked and the width of the pressure change inside the silo bin 1 is small. When the step S15 for sealing and curing around the outside of the hopper 4 is completed, the inner wall W of the silobin 1 is finally washed with high-pressure water (step S16), and the step S1 for preparation is completed.

  Next, the process proceeds to step S2 of the decompression check shown in FIG. In step S2 of the decompression check, first, the inside of the silobin 1 is sealed (step S21). At this time, as described above, the inlet 31 and the outlet 41 are closed with a blind cover (not shown). Next, the inside of the silobin 1 is decompressed using the pressure adjusting duct 5 (see FIG. 6) (step S22). In a silobin that does not have a pressure adjusting duct, a suction pump (not shown) is separately used, and a suction duct (not shown) is inserted into the silobin 1 from the manhole 32 or the manhole 42 to reduce the pressure. . At this time, since the lid of the manhole 32 or the manhole 42 is opened by the diameter of the suction duct, the generated gap portion must be sealed.

In step S22, if the grade of the silobin 1 is a grade A, the grade of the silobin 1 is a special A in the interior of the silobin 1 with a water manometer and a water column height between -200 millimeters and less than -400 millimeters. If it is a grade, the inside of the silobin 1 is depressurized to an arbitrary pressure between -400 millimeters and -600 millimeters with a water manometer.

The degree of decompression varies depending on the state of the silobin, but when the grade of the silobin 1 is a special class A, if the pressure is excessively lowered, a load is applied to the wall body 2, the lid part 3 and the hopper part 4 of the silobin 1, In practice it is usually done at any pressure between -400 millimeters and a little over -500 millimeters, since it can also adversely affect workers working inside.

  Next, soapy water is sequentially applied to the wall 2 of the silobin 1, the lid 3 and the inner wall W of the hopper 4 (step S23), and the damaged portion is marked (step S24). In marking, judgment is made based on the state of soapy water bubbles, and the damaged portion is recorded in a development view and a photograph (step S25). This completes step S2 of the decompression check. An actual example of the development view is shown in FIG.

<Repair method>
Next, the method for repairing the inner wall of the silo bin according to the first embodiment of the present invention will be described in detail. As shown in FIG. 1, the method for repairing the inner wall of the silo bin according to the first embodiment of the present invention is divided into an airtight repair step S3, an airtight test step S4, and a post-processing step S5.

  As shown in FIG. 4, the airtight repair step S3 receives the step S25 of recording the repair location of the step S2 in a development view and a photograph, and first determines the repair specification (step S31). That is, whether the damaged portion is a crack, a pinhole or a jumper, or the damaged portion is a joint portion between the wall body 2 and the lid portion 3 or a joint portion between the wall body 2 and the hopper portion 4. The repair specification varies depending on whether it is a seam or otherwise, or whether it is a seam between a metal part and a concrete part, and the degree of damage, etc. First, the repair specification for each individual damaged part To decide.

  Next, an airtight repair is performed for each of the damaged parts marked with BR> "(step S32). This step corresponds to the intensive repair for the important repaired part. As an example, the damaged part is shown in FIG. 8a. In the case of the crack C1 as shown in FIG. 8, a V-shaped cut V1 is applied to the crack line as shown in FIG. 8b, and the periphery of the crack line is sanded to form the sander surface Sf. The primer resin Pm is applied to the entire sander surface Sf. As shown in FIG. 8c, the V-shaped cut V1 is filled with the urethane resin Uc, and the first layer lining E1 of the epoxy resin is applied to the entire sander surface Sf, and the glass cloth Gc is pasted on the surface. Furthermore, a second layer lining E2 of epoxy resin is applied on the entire surface from above, thereby forming a crack C1 as seen in FIG. Dense repair is completed. Important herein is that is subjected to airtight repair up to around not only crack C1.

  Next, in the case of the pinhole P as shown in FIG. 8d, first, as shown in FIG. 8e, the periphery of the pinhole P is sanded to form the sander surface Sf, and the primer resin Pm is impregnated and applied. As shown to 8f, the 1st layer lining E1 by an epoxy resin is given to the whole sander surface Sf, and also the 2nd layer lining E2 by an epoxy resin is given over the whole surface from there. This completes the critical repair of the pinhole P as seen in FIG. 8d. Even here, it is important that the airtight repair is performed not only to the pinhole P but also to the periphery thereof.

  Next, in the case of the jumper J as shown in FIG. 9a, the concrete layer Fc floating on the surface is first removed, and when there is a cavity Cv in the back, the epoxy resin E is placed in the cavity Cv as shown in FIG. 9b. Inject filling. Next, the resin mortar Rm is filled in the recessed portion as shown in FIG. 9c to adjust the surface to a certain level, and the periphery is impregnated with the primer resin Pm. Next, a first-layer lining E1 made of an epoxy resin is applied to the whole, and a second-layer lining E2 made of an epoxy resin is further applied over the entire surface. This completes the intensive repair of Junker J as seen in FIG. 9d. Here, it is important that airtight repair is performed not only on the surface of the janka J but also on the periphery including the cavity Cv in the back.

  Next, as shown in FIG. 10a, when there is a crack C2 between the inner wall surface W and the metal part M, a V-shaped cut V2 is applied to the crack line, and the periphery is sanded. The surface Sf is formed and impregnated with the primer resin Pm (FIG. 10b). Next, the urethane resin Uc is filled in the V-shaped cut V2, the first layer lining E1 is applied with the epoxy resin across the inner wall surface W and the metal part M, and the glass cloth Gc is adhered thereon. Finally, the second layer lining E2 of epoxy resin is applied to the whole and the process is finished (FIG. 10c).

  Further, as shown in FIG. 10d, when a crack C3 is present between the inner wall surface W2 (W) of the wall body 2 and the inner wall surface W4 (W) of the hopper portion 4, a V-shape is formed on the crack line. A cut V3 is applied, and the periphery is sanded to form a sander surface Sf, which is impregnated with the primer resin Pm (FIG. 10e). Next, the urethane resin Uc is filled into the V-shaped cut V3, and the first layer lining E1 is applied with the epoxy resin across the inner wall surface W2 (W) and the inner wall surface W4 (W), and then the glass cloth is formed thereon. Gc is pasted, and finally the second layer lining E2 of epoxy resin is applied to the whole to finish (FIG. 10f).

  As described above, when the airtight repair is completed at each of the marked damaged portions, the inner wall W of the silobin 1 is washed again with high-pressure water (see step S33, FIG. 4). As a result, residual soap water and chalk powder used for marking are all washed away. The washing water is discharged from the discharge port 41 of the hopper unit 4. Moisture remaining in the inside of the silobin 1 is removed by the step of drying the inside of the next silobin 1 (step S34). The drying is performed by opening the inlet 31, the outlet 41, and the manholes 32 and 42 and naturally drying. However, when the drying is slow, the air may be forcedly dried by sending in dry air from the outside.

  If the inside of the silobin 1 is sufficiently dried, the process proceeds to the next step, and the inner wall W of the silobin 1 is entirely lined with epoxy resin (step S35). There are two reasons for this. That is, as a first reason, small-scale damaged parts that have not yet penetrated to the outer wall surface WO other than the priority repaired parts that have been airtightly repaired in step S32 are also filled and repaired by this lining. This is also a precautionary measure against future damage. Secondly, since the important repaired part that has been airtightly repaired in step S32 is further coated by the entire lining, damage is newly generated at the joint between the repaired part and the non-repaired part, or the repaired important part is repaired. There is no fear of peeling off.

  In any case, since the critical repair point has already been subjected to airtight repair in step S32, it is not necessary to make the entire lining large-scale to ensure confidentiality. Therefore, it is much lighter compared to the conventional full repair specification for the purpose of ensuring airtightness on the entire inner wall of the silobin without specifying the important repair point, and it is also costly compared with the conventional method It can be done at a relatively low price.

  The lining resin used at this time must satisfy the standard of food, additives, etc. notified by the Ministry of Health, Labor and Welfare, since the silobin 1 is for grains. FIG. 15 shows an analytical test report of epoxy resin, but other resins that satisfy the standard standards must be used.

  When the entire surface lining step S35 is completed, the airtight repair step S3 is completed, and the process proceeds to the next airtight test step S4 (see FIG. 5). At this time, in order to sufficiently dry the entire surface lining inside the silobin 1, at least 24 hours after the completion of step S35, the process proceeds to step S4. In step S4 of the airtight test, the silobin 1 is first sealed (step S41), and then air is sent into the silobin 1 to pressurize it (step S42).

  The pressurization is performed with a water manometer until the water column height reaches 500 millimeters, and after 20 minutes have passed after the air supply is stopped, it is confirmed that the inside of the silobin 1 is maintained at the rated pressure (step S43). The rated pressure has a water column height of 200 mm or more in the class A silobin, and a water column height of 400 mm or more in the special class A silobin. If it is confirmed in step S43 that the inside of the silo bin 1 is maintained at the rated pressure, the process proceeds to the next step. If the inside of the silo bin 1 falls below the rated pressure, the process returns to step S2 of the decompression check, and the decompression check is performed. Step S2 and airtight repair step S3 are performed once again.

  FIG. 13 and FIG. 14 show test investigation tables concerning the airtight test. FIG. 13 summarizes the results of the airtight test of the silo of a certain silo before the implementation, that is, before the implementation of steps S2 and S3. At the start, the water column height was 500 millimeters with a water manometer. After 400 minutes, it has already dropped to 400 millimeters after 10 minutes and has dropped to 148 millimeters after 10 minutes and to 50 millimeters after 20 minutes. Therefore, it can be said that the silobin that was the subject of this investigation was in a state of not being specially designated as Class A, or even being designated as Class A.

  FIG. 14 is a test survey table showing the results of performing Steps S2 and S3 on the silobin. After all, the water manometer started with a water column height of 500 millimeters, 488 millimeters after 10 minutes, and 483 millimeters even after 20 minutes, and the amount of air leakage remained very small, functioning as a special class A designated silobin. It is clear that If it will be in such a state, step S4 will be completed and it will progress to step S5 (refer FIG. 5) of the following post-process.

  In step S5 of the post-processing, first, the working scaffolds built inside the silobin 1 and the curing curtain 8 under the hopper 4 are removed (step S51). Next, the removed accessory, that is, the charging duct 31a and the discharging duct 41a (see FIG. 6) are attached (step S52), the inside of the silobin 1 is cleaned (step S53), and all steps are completed. . In addition, according to the method of Example 1 of this invention, it is possible to complete this whole process in about 20 days.

FIG. 12 shows a standard process chart when actual inspection and repair are performed by the method of the first embodiment of the present invention. It should be noted that “unloading” and “unloading” in the process table mean operations for carrying and unloading tools necessary for the operation onto the silobin. Also, in this process table, “decompression test” corresponds to step S2 of depressurization check, “base processing” corresponds to step S32 of hermetic repair, and “lining” refers to the entire interior of silobin 1. This corresponds to step S35 of the lining. Further, the step S12 for removing the accessory hardware is included in the “building scaffolding”.

  By revising the method of full-scale repair that has been performed so far in concrete silobin, the present invention disassembles the entire process into <inspection> and <repair>, and thoroughly identifies damaged parts in the <inspection> process. , <Repair> Realizes an inspection and repair method for concrete silobin that enables intensive repair in the process, and is much simpler, shorter in construction period, and less expensive than the conventional method.

  At present, although metal silobin is steadily increasing, concrete silobin built in the past is still in active use, and as concrete deteriorates due to secular change, requests for rational repairs The current situation is getting stronger and stronger. In other words, the conventional method of completely repairing the entire inner wall of the silobin is costly and requires a long construction period, so that the number of owners who take a second step in repairing is increasing.

  In the method of the present invention, as described above, the <inspection> process and the <repair> process are disassembled and considered to be simple, the construction period is short, and the cost can be far lower than the full repair. In the current economic situation, many silos that have been out of grade can no longer be used. For those who own or manage silos, this is nothing but enormous industrial applicability.

DESCRIPTION OF SYMBOLS 1 Silobin 2 Wall body 3 Cover part 31 Inlet 31a Inlet duct 32 Manhole 33 Duct hole 4 Hopper part 41 Outlet 41a Exhaust duct 42 Manhole 43 Duct hole 5 Duct 6 Duct 61 Outlet 7 Inlet cover 8 Curing body for curing 81 Inlet C1 Crack C2 Crack C3 Crack Cv Cavity E Epoxy Resin E1 First Layer Lining E2 Second Layer Lining Fc Concrete Layer Gc Glass Cloth J Junka M Metal Part P Pinhole Pm Primer Resin Rm Resin Mortar S Space S1 Step S11 Step S12 Step S13 Step S14 Step S15 Step S16 Step S2 Step S21 Step S22 Step S23 Step S24 Step S25 Step S3 Step S31 step S32 step S33 step S34 step S35 step S4 step S41 step S42 step S43 step S5 step S51 step S52 step S53 step Sf sander surface Uc urethane resin V1 cut V2 cut V3 cut W inner wall surface W2 inner wall surface W4 inner wall surface W4

Claims (1)

Inspection method and repair to repair the inner wall of concrete silobin
In the repair method ,
A preparatory step for performing a decompression check;
It has a method for inspecting the inner wall of a concrete silobin, characterized by comprising a step of depressurization check that depressurizes the inside of the silobin and checks the priority repair location ,
After performing the inspection method, all the steps of the inspection of the inner wall of the silobin are completed.
After
A step of performing airtight repair on the important repair location of the inner wall of the silobin;
A step of performing an airtight test after the airtight repair,
In the airtight test, if the pressure is not maintained above the rating, the pressure judgment step returns to the decompression check step,
If the pressure is maintained above the rating in the pressure judgment step, post-processing is performed to complete the work,
A method for repairing the inner wall of a concrete silobin, characterized by comprising:
The step of preparing for the decompression check is
Emptying the inside of the silobin;
Removing the silobin attachment,
Constructing work scaffolds inside the silobin;
Cleaning the inside of the silobin and discharging the dust;
A step of performing a sealed curing in which a suction port is provided in a part of the curing curtain in the hopper portion of the silobin;
Washing the inner wall of the silobin with high pressure water;
More
Depressurization check step to depressurize the inside of the silobin and check the important repair point,
Sealing the silobin;
Depressurizing the interior of the silobin to -200 millimeters to -600 millimeters with a water manometer;
At that time, if the grade of the silobin is class A, the inside of the silobin is decompressed to an arbitrary pressure between -200 millimeters and less than -400 millimeters with a water manometer.
If the grade of silobin is special class A, the inside of the silobin is decompressed to an arbitrary pressure between -400 millimeters and -600 millimeters with a water manometer,
Applying soapy water to the inner wall of the silobin;
Marking the damaged part of the inner wall of the silobin;
The step of recording the damage on the development and photo,
More
The step of performing airtight repair on the critical repair location of the inner wall of the silobin,
A step of determining a repair specification from the above development and photograph;
A step of performing intensive repairs on the parts marked on the development view,
At that time, if the damaged part is a crack, a V-shaped cut is made on the crack line, and the periphery of the crack line is sanded to form a sander surface. The entire sander surface is impregnated with a primer resin, and further V-shaped. Filled with urethane resin in the cut shape, the first layer lining with epoxy resin is applied to the entire sander surface, the glass cloth is pasted on the surface, and the second layer lining with epoxy resin is applied over the entire surface. ,
If the damaged part is a pinhole, first, sander the periphery of the pinhole to make a sander surface, impregnate and apply primer resin, and then apply the first layer lining with epoxy resin to the entire sander surface. The second layer lining with an epoxy resin is applied to the entire surface from
If the damaged part is a jumper, first crush the concrete layer floating on the surface, and if there is a cavity in the back, inject and fill this resin with epoxy resin, and fill the recessed part with resin mortar. To a certain level, the periphery is impregnated with a primer resin, then the whole is subjected to a first layer lining with an epoxy resin, and then a second layer lining with an epoxy resin is applied to the entire surface from above,
If the damaged part is cracked between the inner wall surface and the metal part, make a V-shaped cut on the crack line, sand it around to make a sander surface, impregnate the primer resin, The V-shaped cut is filled with urethane resin, the first layer lining with epoxy resin is applied across the inner wall surface and the metal part, the glass cloth is pasted on top of it, and finally the whole with epoxy resin 2 Apply layer lining,
If there is a crack between the inner wall surface of the wall and the inner wall surface of the hopper, make a V-shaped cut on the crack line, sand it around to make a sander surface, and impregnate the primer resin Next, the urethane resin is filled in the V-shaped cut, and the first layer lining with the epoxy resin is applied across the inner wall surface of the wall body and the inner wall surface of the hopper, and a glass cloth is adhered thereon. Finally, the entire second layer of epoxy resin is applied.
Washing the entire inner wall of the silobin with high pressure water again,
Drying the interior of the silobin;
Lining the entire inner wall of the silobin using a resin for lining that satisfies the standards of food, additives, etc. notified by the Ministry of Health and Welfare,
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The step of performing the airtight test after the airtight repair,
Sealing the silobin;
Pressurizing the interior of the silobin;
Determine whether the internal pressure of the silo bin is maintained above the rated value,
If the pressure inside the robin is maintained above the rated value, proceed to the next step. If not, depressurize the inside of the silo bin and return to the depressurization check step to check the critical repair point.
More
If the pressure is maintained above the rated value, the post-processing is performed and the step of completing the work
Removing working scaffolds and curing,
Attaching the silobin accessories,
Cleaning the inside of the silobin,
More
Determine whether the internal pressure of the silobin is maintained above the rated value. If the internal pressure of the silobin is maintained above the rated value, proceed to the next step. If not, reduce the internal pressure of the silobin. In the pressure judgment step that returns to the decompression check step for checking the priority repair location, the rated pressure is a water manometer and the water column height is 200 millimeters or 400 millimeters ,
Inspection method and repair method of the inner wall of concrete silobin .

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