JP6245745B2 - Caisson filling method - Google Patents

Description

  The present invention relates to a caisson filling material charging method for charging a caisson filling material.

  In order to construct a breakwater, a quay, etc., after the caisson is installed at a predetermined position in a predetermined water area, a filling material is introduced into the caisson (see, for example, Patent Document 1). The filling of the filling material is carried out at sea. However, when the caisson is installed, seawater is often placed in the caisson, and then the filling material is introduced to stabilize the caisson. In other words, when the filling material is introduced, the inside of the caisson is filled with seawater, and by inserting the filling material, the seawater is discharged out of the caisson.

JP2013-040472A

  By the way, sand is generally used for the caisson filling material. Use of a material with high density (non-ferrous slag, steel slag, etc.) instead of sand is often advantageous in design calculations. When actually examined, the stability against sliding is increased by increasing the unit volume weight of the filling material, and the width of the caisson can be reduced. Therefore, an economical design is possible.

However, when non-ferrous slag or the like is used as the filling material, if non-ferrous slag or the like is introduced into a caisson filled with seawater, cloudy seawater is discharged from the caisson, which is not environmentally preferable. Conventionally, when sand is used for the filling material, since it is a naturally derived material, turbidity measures have not been implemented, but the following method is considered as a method for preventing turbidity at the time of charging slag as described above. It is done.
・ Eliminate fine particles of the material to be added by washing in advance.
・ Treat the seawater discharged outside the caisson when filling the filling material, and then discharge it into the sea.

  However, water washing measures require prior water washing operations, increasing the number of work steps, reducing the uniformity coefficient by eliminating fine particles, and reducing the unit volume weight of the caisson filling material. If the unit volume weight is small, the design weight may not be secured. In addition, the turbid water treatment requires a turbid water treatment facility, which costs equipment and takes time for the turbid water treatment. This need for muddy water treatment has contributed to the obstacle to using non-ferrous slag as a caisson filling material.

  In the present invention, in view of the problems of the prior art as described above, when slag or the like is used as a caisson filling material, it is possible to prevent the occurrence of turbidity of seawater due to the filling material, and due to the dropping of the filling material in water. An object of the present invention is to provide a caisson filling material charging method that can prevent a decrease in unit volume weight.

  In order to achieve the above object, the caisson filling material charging method according to the present embodiment is configured such that a charging pipe is installed in the caisson so that the lower end extends to the vicinity of the bottom, and water enters from the lower end of the charging pipe. Without injecting air into the input pipe below the open / close lid so that the open / close lid provided inside the input pipe is closed, and filling the filling material from the upper end of the input pipe, The openable lid is opened by the pressure due to the dead weight of the charged filling material, the filling material falls in the air in the charging tube, and the middle from the lower end of the charging tube to the bottom of the caisson The filling material is discharged, the injection pipe is pulled up by a predetermined height, and then the air injection and the filling of the intermediate filling material are repeated.

  According to this caisson filling material charging method, it is possible to fill the filling material in order from the bottom of the caisson by injecting air into the lower part of the charging pipe to prevent the ingress of seawater from the lower end of the charging pipe. Therefore, even if slag is used as the filling material, turbidity does not occur in the seawater in the caisson. In addition, the filling material is dropped into the air in the input pipe, and the drop speed and the material separation in the case of dropping in water do not occur. Therefore, the unit volume weight of the filling material does not decrease. Therefore, since it is not necessary to remove fine particles from the filling material, a material such as slag, which contains fine particles, has a high uniformity coefficient, and tends to increase the unit volume weight, is used as the filling material. be able to. Moreover, since the turbidity of the seawater in the caisson does not occur, it can be discharged as it is, and no turbid water treatment facility is required.

In another caisson filling material charging method according to the present embodiment, a charging pipe is installed in the caisson so that the lower end extends to the vicinity of the bottom of the caisson, water does not enter from the lower end of the charging pipe, and the charging pipe Air is injected into the charging pipe below the lower opening / closing lid so as to close the lower opening / closing lid provided on the inside lower side, and the filling material is charged from the upper end of the charging pipe. The upper open / close lid provided on the upper side of the charging pipe is opened by the pressure caused by the dead weight of the filled filler, and the filler is dropped and deposited on the lower open / close lid, and the lower open / close lid is opened. By injecting air into the space in the charging pipe between the upper end of the filling material deposited on the lid and the upper opening / closing lid, the lower opening / closing lid is opened, and the filling The material falls in the air in the charging pipe, and the caisson from the lower end of the charging pipe Is a bottom wherein the exhaust is packed material into, and repeating the injecting and introduced in said filling material of the air from the pulling said feeding pipe by a predetermined height.

  According to this caisson filling material charging method, it is possible to fill the filling material in order from the bottom of the caisson by injecting air into the lower part of the charging pipe to prevent the ingress of seawater from the lower end of the charging pipe. Therefore, even if slag is used as the filling material, turbidity does not occur in the seawater in the caisson. In addition, the filling material is dropped into the air in the input pipe, and the drop speed and the material separation in the case of dropping in water do not occur. Therefore, the unit volume weight of the filling material does not decrease. Therefore, since it is not necessary to remove fine particles from the filling material, a material such as slag, which contains fine particles, has a high uniformity coefficient, and tends to increase the unit volume weight, is used as the filling material. be able to. Moreover, since the turbidity of the seawater in the caisson does not occur, it can be drained as it is, and no turbid water treatment facility is required. In addition, open / close lids are provided at the top and bottom of the input pipe, and the lower open / close lid does not open only by the dead weight of the filling material deposited on the top, but injects air into the space above the filling material. When the pressure is applied, the lower openable lid does not open due to the weight of the filling material alone due to insufficient height at the top of the input pipe or insufficient amount of filling material. But it can be opened. For this reason, the degree of freedom in the design of the input pipe increases, and the degree of freedom in the management of the amount of input of the filling material increases. Further, when the lower open / close lid is open, the upper open / close lid is closed, so that the intrusion of seawater from below the charging pipe can be prevented.

  In the caisson filling material charging method, the opening / closing lid, the lower opening / closing lid, and the upper opening / closing lid are opened when a pressure equal to or higher than a predetermined pressure is applied to the charging pipe from above. It is preferable that the pressure is blocked by applying the above pressure from below.

  It is preferable that the charging pipe is configured to be extendable and the height position of the upper end of the charging pipe is constant even when the charging pipe is pulled up.

  After filling the filling material to a predetermined height in the caisson, the seawater on the filling material is discharged, and even if the filling material is inserted, the seawater does not overflow and is not discharged. It is preferable to finish the top end of the filling material by directly feeding the material.

  It is preferable to provide a funnel-shaped portion having a shape extending upward at the upper end of the charging pipe.

  According to the caisson filling material charging method of the present invention, when slag or the like is used as the caisson filling material, the turbidity of seawater caused by the filling material can be prevented, and the unit volume due to the dropping of the filling material in water. Reduces weight. Therefore, a material such as slag whose unit volume weight tends to be larger than conventional sand can be used as the caisson filling material, and the caisson has increased stability against sliding due to the increase in the unit volume weight of the filling material. Moreover, since the width of the caisson can be reduced, an economical design is possible.

It is a figure which shows roughly the inside of a caisson in order to demonstrate the filling material injection method in a caisson by 1st Embodiment. It is a flowchart for demonstrating each process of the caisson filling material injection | throwing-in method by 2nd Embodiment. It is the schematic (a)-(i) which shows the inside of a caisson, in order to demonstrate each process of the filling material introduction method in a caisson by 2nd Embodiment. It is a longitudinal cross-sectional view which shows the structure of the injection pipe of FIG. 3 schematically. It is a flowchart for demonstrating each process of the caisson filling material injection | throwing-in method by 3rd Embodiment. It is the schematic (a)-(e) which shows the inside of a caisson, in order to demonstrate the main processes of the caisson filling material injection | throwing-in method by 3rd Embodiment. It is a figure which shows the cross section of the example of examination of the caisson design in this embodiment. It is a table | surface which shows the examination result of each case of the examination example of FIG. It is a figure which shows the example of a measurement of the unit volume weight of copper slag, and is the schematic (a) which shows the container used for the measurement, and the table | surface (b) which shows a measurement result.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

<First Embodiment>
FIG. 1 is a diagram schematically showing the inside of a caisson for explaining the caisson filling material charging method according to the first embodiment.

  As shown in FIG. 1, the interior of the caisson CA installed at the bottom of the predetermined water area is filled with seawater W. A charging pipe 10 for charging the filling material is installed inside the caisson CA. The lower end 10a of the charging pipe 10 extends to the vicinity of the bottom BT of the caisson CA. By providing a funnel-shaped portion 10b having a shape that expands upward at the upper end of the input pipe 10, it is easy to input the filling material.

  An open / close lid 20 is provided in an intermediate region inside the charging pipe 10. The open / close lid 20 is configured to be rotatable about one end of the rotation shaft 20a at one end, and closes in contact with the upper receiving portion 20b by the pressure in the lower portion 10c inside the charging tube 10. FIG. When the filling material FM is charged and accumulated as shown by the broken line in FIG. 8, the pressure is caused by the pressure of the weight of the filling material FM to rotate in the downward direction r so as to be released.

  After the opening / closing lid 20 is rotated and opened in the lower direction r and the filling material is dropped, the opening / closing lid 20 is rotated in the upper direction against the weight of the opening / closing lid 20 (not necessarily sealed). ), An urging member (not shown) made of a coil spring or the like is provided in the vicinity of the rotating shaft 20a. Thereby, when air is inject | poured into the lower part 10c of the injection | throwing-in pipe | tube 10 for injection | throwing-in of the next filling material, the opening-and-closing type cover part 20 can be obstruct | occluded smoothly.

  A compressor P is connected to the lower part 10c inside the charging pipe 10 through a hose HS. By operating the compressor P and injecting air into the lower part 10c to obtain a predetermined pressure, air does not enter the lower part 10c from the lower end 10a of the charging pipe 10, and the openable lid part 20 abuts against the receiving part 20b. The input pipe 10 is closed.

  When the filling material FM is introduced and stored on the opening / closing lid 20 in a state where the opening / closing lid 20 is closed by the pressure from below in the lower portion 10c of the charging tube 10, the filling is performed. The openable lid 20 is rotated in the downward direction r by the pressure from above due to the weight of the material FM and is opened. The relationship between the upper and lower pressures of the openable lid 20 in this case will be described with reference to FIG.

When the unit volume weight of seawater is 10.3 kN / m ³ and the water depth (height from the surface of seawater W in FIG. 1 to the lower end 10a of the inlet pipe 10) is h (m), the lower end 10a of the inlet pipe 10 is Since a water pressure of h × 10.3 kN / m ² is applied, the openable lid portion 20 receives a pressure of h × 10.3 kN / m ² from below by the air in the lower portion 10 c of the charging pipe 10. When slag in a natural state is charged as a filling material and dropped in the air from the upper end to the openable lid 20 at the upper part 10d of the charging pipe 10, the slag has a dry unit volume weight of 19.5 kN / m ³ (soil particles depositing a slug of about density 3.5 on the assumption), when the height and H (m), pressure due to the weight of the slag is H × 19.5kN / m ^2. When the pressure H × 19.5 kN / m ² due to the weight of the filling material becomes equal to or higher than h × 10.3 kN / m ² , the openable lid 20 is rotated in the downward direction r to be opened. That is, since it is opened in the case of 10.3 × h ≦ 19.5 × H, H ≧ 0.53 × h. From this, the height from the openable lid portion 20 to the upper end of the input tube 10 (the height of the upper portion 10d of the input tube 10) H) H is required to be 0.53 times the depth of water h or more.

  As described above, the filling material falls into the charging pipe 10 in the air and is discharged from the lower end 10a to the bottom portion BT of the caisson CA, so that the seawater W overflows and is discharged from the upper end inside the caisson CA. The Next, after raising the input pipe 10 by a predetermined height, the injection of air by the compressor P into the lower part 10c of the input pipe 10 and the introduction of the filling material are repeated. With this charging, the filling material accumulates in order from the bottom BT of the caisson CA, and when the predetermined height is reached, the upper number m of the caisson CA discharges seawater without filling the filling material, and throws the filling material. After filling the seawater with no discharge, fill the filling material directly and finish the top.

  As described above, according to the caisson filling material charging method of the present embodiment, the filling material injection pipe 10 is installed in the caisson CA so as to extend to the vicinity of the bottom portion BT, and is placed in the lower part 10 c of the injection pipe 10. By injecting air and preventing seawater from entering the inlet tube 10 from its lower end 10a, the filling material can be directly filled in order from the bottom BT of the caisson CA. Even if it is used, turbidity does not occur in the seawater in Caisson CA. Therefore, the surrounding water area is not contaminated by seawater overflowing from the caisson CA due to the filling material such as slag.

  Further, since the filling material falls in the air in the charging pipe 10, there is no drop in speed or material separation in the case of dropping in water. For this reason, the unit volume weight of the filling material does not decrease. Therefore, since it is not necessary to remove fine particles from the filling material, a material such as slag, which contains fine particles, has a high uniformity coefficient, and tends to increase the unit volume weight, is used as the filling material. be able to. Moreover, since turbidity does not generate | occur | produce in the seawater in caisson CA, it can drain as it is, and a muddy water treatment facility is unnecessary.

  In addition, it is necessary to manage the pressure in the lower part 10c so that seawater does not enter from the lower end 10a of the charging pipe 10. Moreover, although the slag which can be used as a filling material includes, for example, copper slag generated from a smelter, it is not limited to this.

  Further, when the openable lid portion 20 is opened by the dead weight of the filling material and the filling material falls in the charging tube 10, the pressure in the lower portion 10 c of the charging tube 10 is released, and therefore the lower end of the charging tube 10. The seawater enters from 10a, and the pressure from the bottom of the seawater closes the openable / closable lid 20, and the falling of the filling material may be interrupted. There is no problem because the material falls at the next input.

Second Embodiment
FIG. 2 is a flowchart for explaining each step of the caisson filling material charging method according to the second embodiment. FIGS. 3A to 3I are schematic views showing the interior of the caisson for explaining the steps of the caisson filling material charging method according to the second embodiment. FIG. 4 is a longitudinal sectional view schematically showing the structure of the charging pipe shown in FIG. In addition, the same component as FIG. 1 of this embodiment attaches | subjects the same code | symbol, and abbreviate | omits the description.

  As shown in FIGS. 3 and 4, the charging pipe 10 for charging the filling material into the caisson in the present embodiment is configured to be extendable and contractable by a large diameter pipe 11 to a small diameter pipe 14, and the pipes 11, 12, 13 and 14 are arranged in order from the lower side to the upper side. The input pipe 10 is airtight except for the upper and lower ends.

  As shown in FIG. 4, in a state where the pipes 11 to 13 of the input pipe 10 are extended, the pipe 11 is supported with the inner protrusion 11 a at the upper end engaged with the outer protrusion 12 b at the lower end of the pipe 12, and the pipe 12 is The inner projecting portion 12a is engaged with and supported by the outer projecting portion 13b at the lower end of the tube 13, and the inner projecting portion 13a at the upper end is engaged and supported by the outer projecting portion 14b at the lower end of the tube 14. The input pipe 10 is configured to be pulled upward by a pulling mechanism in order from the lower large-diameter pipe 11.

  That is, as shown in FIG. 4, lower ends 21 a of a plurality of wires 21 are fixed to the outer periphery of the lowermost tube 11 of the input tube 10, and the wires 21 are arranged via pulleys 22 arranged in the vicinity of the upper ends of the input tubes 10. The pipe 11 is pulled up by a predetermined height by being wound up by a predetermined length by a winch (not shown) and pulled upward. The pipe 12 is pulled up by a predetermined height when the pipe 11 is pulled up and the abutting portion 11 b on the inner periphery of the pipe 11 comes into contact with the outer protrusion 12 b at the lower end of the pipe 12. Similarly, the tube 13 is pulled up by a predetermined height when the tube 12 is pulled up and the inner peripheral contact portion 12c of the tube 12 contacts the outer protrusion 13b at the lower end of the tube 13.

  As described above, the tubes 11 to 13 are sequentially pulled up by the winding of the wire 21, and the position of the lower end 10 a of the charging tube 10 can be adjusted to a predetermined height by the winding length of the wire 21. In this way, even if the input pipe 10 is pulled up and the position of the lower end 10a of the input pipe 10 is sequentially increased, the overall length of the input pipe 10 is reduced accordingly. Is constant without change. In addition, by loosening the wire 21 from the state where the pipes 11 to 13 are pulled up, the pipes 11 to 13 are lowered by their own weight and return to the state shown in FIG.

  With reference to FIGS. 2 to 4, each step of charging the filling material into the caisson according to the present embodiment will be described. First, as shown in FIG. 3A, the charging pipe 10 of FIG. 4 is installed inside the caisson CA (S01), and the compressor P is operated to inject air into the lower part 10c of the charging pipe 10 (S02). . By the air injection, the upper portion from the lower end 10a of the charging tube 10 is filled with air, and the openable lid portion 20 is rotated upward to be closed (S03).

  Next, as shown in FIG. 3 (b), the filling material FM made of slag is charged into the charging pipe 10 from the funnel-shaped portion 10 b at the upper end (S 04), and the filling material FM is placed on the openable lid portion 20. accumulate.

  As described with reference to FIG. 1, when the pressure due to the weight of the filling material FM deposited on the upper portion 10d of the charging pipe 10 exceeds the pressure of the air in the lower portion 10c, the openable lid portion as shown in FIG. 20 is released (S05), and the filling material FM naturally falls in the air in the lower portion 10c (S06).

  The fallen filling material FM flows out from the lower end 10a of the charging pipe 10 and is discharged to the bottom portion BT of the caisson CA as shown in FIG. Next, the wire 21 is pulled upward by the pulling mechanism of FIG. 4, and the lowermost tube 11 is pulled up as shown in FIG. 3E (S08).

  Next, returning to the air injection step S02, through the same step, the filling material FM is charged and discharged from the lower end 10a of the charging tube 10. In this way, each process is repeated, and as shown in FIG. 3 (f), when the filling material FM is deposited in the caisson CA and reaches a height of several m above the caisson CA, the inside of the charging pipe 10 is The filling material is completely charged (S07).

  Next, the top end finishing process of the filling material FM is performed (S09). That is, as shown in FIG. 3G, the seawater remaining in the upper part of the caisson CA is discharged by the pump 25. After the drainage, the seawater overflows from the state shown in FIG. 3 (h) and the seawater overflows and is not discharged. Thereafter, the medium filling material FM is directly added, as shown in FIG. 3 (i). Finish the top.

  According to the caisson filling material charging method of the present embodiment, since it is configured as described above, it is possible to obtain the same effect as in FIG. Even if the lower end 10a is pulled up for repeated charging, the height position of the upper end of the charging pipe 10 remains constant, so there is no need to change the charging height position of the filling material. Increase in size and complexity can be prevented.

<Third Embodiment>
FIG. 5 is a flowchart for explaining each step of the caisson filling material charging method according to the third embodiment. FIGS. 6A to 6E are schematic views showing the inside of a caisson in order to explain the main steps of the caisson filling material charging method according to the third embodiment. This embodiment is a configuration in which an openable lid portion is also arranged on the top of the input pipe with respect to the configurations in FIGS. 3 and 4, and the same components as those in FIGS. Description is omitted.

  As shown in FIGS. 6A to 6E, in the present embodiment, in addition to the lower openable / closable lid part 20 in the middle of the input pipe 10, the same configuration as the lower openable / closable cover part 20 is provided at the upper end of the input pipe 10. The upper opening / closing type lid portion 27 is provided, and the compressor P is connected to the lower portion 10c and the upper portion 10d of the charging pipe via the switching valve 28.

  With reference to FIG. 5 and FIG. 6, each step of charging the filling material into the caisson according to the present embodiment will be described. First, the charging pipe 10 of FIG. 4 is installed inside the caisson CA (S11), and air is injected into the lower part 10c of the charging pipe 10 from the compressor P through the switching valve 28 (S12). Due to the injection of air, the upper part from the lower end 10a of the charging pipe 10 is filled with air, and the lower open / close lid 20 is closed (S13).

  Next, the filling material FM made of slag is charged from the funnel-shaped portion 10b of the charging tube 10 (S14). As shown in FIG. 6 (a), the upper open / close lid part 27 is opened by the pressure of the dead weight of the filling material FM stored on the upper open / close lid part 27 (S15), and the intermediate filler material FM is inserted into the charging pipe. 10 naturally falls in the air in the upper part 10d, and is deposited on the lower openable lid 20 (S16).

  Since the lower open / close lid 20 is not yet opened by the pressure due to the accumulated weight of the filling material FM alone, as shown in FIG. 6B, the upper end and the upper portion of the filling material FM in the upper portion 10d of the charging pipe 10 are used. Air is injected from the compressor P through the switching valve 28 into the space 10e between the openable lid portion 27 (S17).

  Next, when the sum of the pressure due to the weight of the filling material FM deposited on the upper portion 10d of the charging pipe 10 and the pressure of the air in the space 10e exceeds the pressure of the air in the lower portion 10c, as shown in FIG. The lower open / close lid 20 is opened (S18), and the filling material FM naturally falls in the air in the lower part 10c (S19).

  The fallen filling material FM flows out from the lower end 10a of the charging pipe 10 and is discharged to the bottom portion BT of the caisson CA as shown in FIG. 6 (d). Next, the wire 21 is pulled upward by the pulling mechanism of FIG. 4, and the lowermost tube 11 is pulled up as shown in FIG. 6E (S21).

  Next, the process returns to the air injection step S12, and the filling material FM is charged through the same process and discharged from the lower end 10a of the charging tube 10. In this way, each step is repeated, and when the filling material FM is accumulated in the caisson CA as shown in FIG. 3 (f) and reaches a height of several m above the caisson CA, the charging pipe 10 The filling of the filling material is finished (S20).

  Next, in the same manner as in FIGS. 3G to 3I, the top end finishing process of the filling material FM is performed (S22).

  According to the caisson filling material charging method of the present embodiment, since it is configured as described above, it is possible to obtain the same effects as in FIGS. 27, 20 is provided, and the lower open / close lid 20 is not opened only by its own weight of the filling material FM deposited on the upper portion 10d, but air is injected into the space 10e above the filling material FM to apply pressure. When the lower opening / closing lid 20 is not opened only by its own weight of the filling material FM due to insufficient height of the upper portion 10d of the filling tube 10 or insufficient amount of filling material FM, etc. But it can be opened. In this manner, the charging of the filling material can be controlled by adjusting the pressure in the upper portion 10d of the charging pipe 10 by the air injection into the space 10e. For this reason, the freedom degree of design of the injection | throwing-in pipe | tube 10 increases, and the freedom degree of management of the amount of inside filling materials increases. Further, when the lower opening / closing lid portion 20 is opened, the upper opening / closing lid portion 27 is closed, so that seawater does not enter from below the charging pipe 10.

  As described above, according to each of the above embodiments, a material such as slag, whose unit volume weight tends to be larger than that of conventional sand, can be used as the caisson filling material. For this reason, the caisson can be designed economically because the stability against sliding is increased by increasing the unit volume weight of the filling material and the width of the caisson can be reduced.

  Next, a specific example of caisson will be described with reference to FIGS. FIG. 7 is a diagram showing a cross section of an example of examination of caisson design in the present embodiment. FIG. 8 is a table showing the examination results in each case of the examination example of FIG. Case 1 assumes sand as the filling material, and Cases 2 to 5 assume a material whose saturation unit volume weight is larger than sand as the filling material, and reduce the width of the caisson (dam body width) relative to case 1. The stability of the caisson is investigated. As a result, as shown in FIG. 8, for the case 1 in which the filling material is sand, the cases 2, 3 and 5 are made of a material whose saturation unit volume weight is likely to be larger than the sand as the filling material. It was found that the stability of the caisson can be secured while reducing the width of the bank.

  In addition, the inventors measured the unit volume weight by taking copper slag as an example. That is. Using the container of FIG. 9 (a), copper slag was introduced from the upper end of the container, dropped in water and dropped in the air, and after the addition, the unit volume weight in the lower part of the container 30 cm was measured. The measurement results are shown in the table of FIG. According to this measurement result, the saturation unit volume weight and the dry unit volume weight of the copper slag are larger in the case of dropping in the air than in the case of dropping in water. It has been found that a large unit volume weight can be achieved by using slag and dropping it into the inlet tube. Thus, it can be seen that the required unit volume weight can be ensured by dropping the copper slag in the air without material separation at the time of charging.

  As described above, the modes for carrying out the present invention have been described. However, the present invention is not limited to these, and various modifications can be made within the scope of the technical idea of the present invention. For example, the input tube 10 is preferably a cylindrical tube, but is not limited thereto, and may be a rectangular tube.

  In addition, the input pipe 10 is made of a steel pipe, but is not limited to this, and may be made of a light material such as a resin material. It becomes easy. On the other hand, since the charging pipe 10 is filled with air and buoyancy is generated in the charging pipe 10, a weight and a structure that can prevent lifting may be required. Therefore, it is desirable to determine the material, weight, structure, etc. of the input pipe so that the ease of construction and the prevention of floating of the input pipe are in harmony, or when either one is emphasized.

  If necessary, the unit volume weight of the filling material may be increased by compacting the filling material after the filling material has been put into the caisson.

  According to the caisson filling material charging method of the present invention, even if slag or the like is added as caisson filling material, the turbidity of seawater due to the filling material can be generated without installing a special muddy water treatment facility. Therefore, the slag can be used as a filling material, and therefore, the stability of the caisson against sliding can be ensured while reducing the width of the caisson. Therefore, it is possible to contribute to the realization of a breakwater, quay, etc. that are stable and can be economically designed.

DESCRIPTION OF SYMBOLS 10 Input pipe 10a Lower end 10b of funnel-shaped part 10c Lower part 10d of input pipe Upper part 11-14 of the input pipe 20 Opening / closing lid part, lower opening / closing lid part 21 Wire 27 Upper opening / closing lid part BT Bottom CA Caisson FM Filling material P Compressor W Seawater

Claims (7)

Install the input pipe inside the caisson so that the lower end extends to the vicinity of the bottom,
Injecting air into the input pipe below the open / close lid so that water does not enter from the lower end of the input pipe and the open / close lid provided inside the input pipe is closed,
Insert the filling material from the upper end of the input pipe,
The openable lid is opened by pressure due to the weight of the charged filling material, and the filling material falls in the air in the charging tube,
The filling material is discharged from the lower end of the input pipe to the bottom of the caisson,
The caisson filling material charging method, wherein the air injection and the filling material charging are repeated after pulling up the charging pipe by a predetermined height Install the input pipe inside the caisson so that the lower end extends to the vicinity of the bottom,
Air is injected from the lower openable / closable lid into the lower feed pipe so that water does not enter from the lower end of the input pipe and the lower openable / closable lid provided on the lower side of the input pipe is opened. And
Insert the filling material from the upper end of the input pipe,
The upper opening / closing lid provided on the upper side of the charging pipe is opened by the pressure due to the dead weight of the inserted filling material, the filling material falls and accumulates on the lower opening / closing lid portion,
By injecting air into the space in the charging pipe between the upper end of the filling material deposited on the lower openable lid and the upper openable lid, the lower openable lid is opened, The filling material falls in the air in the input pipe,
The filling material is discharged from the lower end of the input pipe to the bottom of the caisson,
A caisson filling material charging method, wherein the air injection and the filling material charging are repeated after the charging pipe is pulled up by a predetermined height. 2. The caisson filling material charging method according to claim 1 , wherein the openable lid portion is opened when a pressure equal to or higher than a predetermined pressure is applied from above in the charging pipe and closed when a pressure equal to or higher than a predetermined pressure is applied from below. . The lower opening / closing lid part and the upper opening / closing lid part are opened when a pressure equal to or higher than a predetermined pressure is applied from above in the charging pipe, and closed when a pressure higher than a predetermined pressure is applied from below. The caisson filling material input method described. The caisson filling material charging method according to any one of claims 1 to 4 , wherein the charging pipe is configured to be extendable and the height position of the upper end of the charging pipe is constant even when the charging pipe is pulled up. After filling the filling material to a predetermined height in the caisson, the seawater on the filling material is discharged, and even if the filling material is inserted, the seawater overflows and is not discharged. The caisson filling material injection method according to any one of claims 1 to 5 , wherein the top end of the filling material is finished by directly adding the material. The caisson filling material charging method according to any one of claims 1 to 6 , wherein a funnel-shaped portion having a shape expanding upward is provided at an upper end of the charging pipe.

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