JP2006348666A - Underwater object suction/transfer apparatus, dredging method using the same, method for removing filling material of caisson, and method for removing deposit in foundation pile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an underwater suction/transfer apparatus capable of efficiently jetting compressed water by a compact submerged pump and excellent in costs of compressed water and maintainability. <P>SOLUTION: The underwater suction/transfer apparatus is provided with a suction main pipe 2; a plurality of compressed water jet nozzles 27A and 27A connected to a compressed water supply source and arranged in the periphery of an opening part 3; and an air pipe 11 connected to the compressed water supply source and having an air jet opening 12A inserted in the suction main pipe 2. When a prescribed flow of air A is jetted into water in the suction main pipe 2 from the air jet opening 12A of the air pipe 11, a mixture of water and air in the suction main pipe 2 is pressed upward. Since compressed water is jetted by the submerged pump 21 mounted to the suction main pipe 2, it is possible to shorten a conduit of the compressed water W and reduce cost required for its material and maintenance. Since it is possible to reduce conduit resistance, the submerged pump 21 having a small capacity is available. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to an underwater suction / transport device that sucks and transports underwater such as earth and sand at the bottom of the water, a dredging method using the same, a caisson filling material removal method, and a sediment removal method in a foundation pile.

  Conventionally, grab buckets (for example, Patent Document 1) and cutters (for example, Patent Document 2) are known as devices for excavating or dredging sediments in the bottom of the water, and the grab bucket is mud that has been scooped up at the bottom of the water. The bucket is opened and opened on the dredger, and the cutter transports the earth and sand excavated at the bottom of the water through the suction pipe onto the dredger.

  In the case of using the above grab bucket, skill is required for the operator, and a space for opening and closing the bucket is required, so that the use location is likely to be limited. In addition, the cutter is suitable for excavation of dredged mud and the like, but when solid matter is mixed in the mud and the solid matter cannot be crushed by the cutter, the solid matter having a predetermined size or larger is sucked. I can't.

  In order to solve such a problem, a drilling main body in which a grounding opening facing a ground excavation target surface is formed at one end and a discharge part is formed at the other end is connected to a drilling water pressurizing supply source. And a plurality of water jet nozzles arranged around the ground opening toward the surface to be excavated, and an air lift pipe connected to a lift air supply source and having an air outlet inserted into the excavation main pipe It is conceivable to use an underwater excavator (for example, Patent Document 3) for sucking and conveying underwater objects.

In the underwater drilling device, the surface to be excavated is eroded by discharging high-pressure drilling water from a water jet nozzle to collide with the surface to be excavated in the ground facing the ground opening of the main excavation pipe. And liquefied. Then, when air of a predetermined flow rate is ejected from the air outlet of the air lift pipe into the water in the main drilling pipe, the water in the main drilling pipe becomes lighter by mixing with the air, and the water pressure is higher than the water pressure outside the main drilling pipe. Therefore, the pressure difference (water head pressure) pushes the water / air mixture in the main excavation pipe upward. For this reason, the earth and sand loosened by the discharge of the drilling water is sucked up by the upward flow of the mixture and discharged from the discharge portion.
Japanese Patent Laid-Open No. 5-15898 JP-A-10-159125 JP-A-6-264676

  In the apparatus of Patent Document 3 above, the water jet nozzle is connected to a drilling water pressurization supply source via a flexible tube, and since this drilling water pressurization supply source is provided at a place other than the main excavation pipe, Flexible tube piping is required, and piping costs and maintenance are required. In addition, when working at the bottom of a deep water, the length of the flexible tube becomes long, so a pump with a large capacity is required due to piping resistance.

  Therefore, the present invention is capable of efficiently injecting compressed water with a small submersible pump, and has a cost and maintenance performance related to compressed water, a dredging method using the same, and a caisson filling method. It aims at providing the material removal method and the sediment removal method in a foundation pile.

  The invention according to claim 1 is connected to a suction main body having an opening formed at one end facing an object to be sucked in water and a discharge part formed at the other end, and a compressed water supply source. In a submerged product suction conveyance device comprising a compressed water injection nozzle arranged around the opening toward the opening, and an air tube connected to a compressed air supply source and having an air outlet connected to the inside of the suction main pipe The compressed water supply source is a submersible pump, and the submersible pump is provided on the outer periphery of the suction main pipe.

  According to a second aspect of the present invention, the suction main pipe is a straight pipe, the submersible pump is substantially cylindrical, and the submersible pump is fixed with the straight pipe and the axis of the submersible pump being substantially parallel to each other. It is a thing.

  According to a third aspect of the present invention, the conduit connecting the submersible pump and the compressed water injection nozzle is made of a hard pipe.

  According to a fourth aspect of the present invention, there is provided a dredging method using the underwater object suction conveyance device according to the first aspect, wherein the suction object is a bottom sediment or the like, and the compressed water jet is applied to the bottom sediment. This is a dredging method in which compressed water is ejected from a nozzle and air is ejected from the air ejection port, thereby sucking earth and sand at the bottom of the water and transporting the sucked earth and sand to the discharge section.

  The caisson filling material removal method according to claim 5 is the caisson filling material removal method using the underwater suction suction device according to claim 1, wherein the suction object is the filling material in the caisson. The compressed water is injected from the compressed water injection nozzle to the filling material, and the air is discharged from the air outlet, thereby sucking the filling material and sucking the sucked filling material into the discharge part. This is a method for removing the filling material of caisson that is removed by conveying.

  Moreover, the deposit removal method in the foundation pile of Claim 6 is a deposit removal method in the foundation pile using the underwater object suction conveyance apparatus of Claim 1, Comprising: The said suction object is in a foundation pile. It is a deposit, and the deposit is sucked by ejecting compressed water from the compressed water jet nozzle to the deposit and ejecting air from the air outlet, and the sucked deposit is conveyed to the discharge unit. This is a method for removing sediment in the foundation pile that is removed by doing.

  According to the configuration of the first aspect, the suction target is eroded by discharging high-pressure compressed water from the compressed water injection nozzle to collide with the target in water facing the opening of the suction main pipe. It is loosened and sucked into a lump or liquefied. Then, when air of a predetermined flow rate is ejected from the air outlet of the air pipe into the water in the suction main pipe, the water in the suction main pipe becomes lighter by mixing with the air, and the water pressure is higher than the water pressure outside the suction main pipe. Therefore, the water / air mixture in the suction main is pushed upward by this pressure difference (water head pressure). For this reason, the suction object in the water loosened by the discharge of the compressed water is sucked up by the upward flow of the mixture and discharged from the discharge portion. In particular, since the injection of compressed water is performed by a submersible pump attached to the suction main pipe, the compressed water pipe line can be shortened, and the cost of materials and maintenance can be reduced, and the pipe resistance is reduced. The pump capacity is not required to be relatively large.

  Moreover, according to the structure of Claim 2, a submersible pump can be integrated compactly along the suction main pipe.

  Moreover, according to the structure of Claim 3, it is excellent in durability compared with a flexible tube etc., and even if a suction main pipe is inserted in a comparatively narrow place, a pipe line is hard to be damaged and becomes highly reliable. .

  Moreover, according to the structure of Claim 4, while sucking and compressing compressed water to earth and sand etc. of a water bottom, this earth and sand etc. can be sucked and dredged from an opening part. In this method, it is possible to suck a large-sized one as compared with a conventional cutter and the like, and it is possible to deal with dredging in which solid matter is mixed in earth and sand or dredging with earth and sand.

  According to the fifth aspect of the present invention, the suction main pipe is inserted into the existing caisson, and the internal filling material is loosened by the compressed water and sucked from the opening and removed to the outside. In this method, when the inside is partitioned by caisson such as existing, and there is a solid material that is solidified or accumulated inside, the suction main pipe is inserted into the relatively narrow space, and the internal filling material is inserted. While loosening, it can be removed by suction.

  Moreover, according to the structure of Claim 6, a suction main pipe | tube is inserted in a foundation pile, and it sucks and removes outside from the opening part, loosening an internal deposit with compressed water. In this method, the suction main pipe can be inserted into a relatively narrow interior such as an underwater foundation pile, and the suction can be removed while loosening the deposits inside.

  Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below do not limit the contents of the present invention described in the claims. In addition, all of the configurations described below are not necessarily essential requirements of the present invention. In each embodiment, by adopting a new underwater suction / conveyance device that is different from the conventional one, an underwater suction / conveyance device with an unprecedented function can be obtained. The method, the caisson filling material removal method, and the sediment removal method in the foundation pile are described.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 5 show Embodiment 1 of the present invention. The figure shows an example in which the present invention is used in a caisson filling material removing method, and as shown in the figure, the underwater suction / conveyance device 1 includes a suction main pipe 2 made of a straight pipe such as a steel pipe, A thick wall portion 2A is integrally provided at the distal end of the suction main pipe 2, and the distal end of the thick ring portion 2A is an opening 3. Further, the other end of the suction main pipe 2 is a discharge portion 5, and a flange 4 serving as a joint is provided at the other end.

  A plurality of air pipes 11, 11... Are fixed to the outer periphery of the suction main pipe 2 at equal intervals in the circumferential direction, and these four air pipes 11, 11. The elbow pipe 12 of approximately 180 degrees is provided at the tip side, and an air outlet 12A that is an opening of the elbow pipe 12 is connected to the inside of the suction main pipe 2. Further, the other end of the air lift pipe 11 is provided with a female screw cylinder 13 as a joint.

  A submersible pump 21 serving as a compressed water supply source is fixed to the outer periphery of the suction main pipe 2. A bracket 22 is provided on the outer peripheral opening 3 side of the suction main pipe 2, and the submersible pump 21 is fixed to the bracket 22 in a mounted state. The submersible pump 21 has a substantially cylindrical shape, and its axis 21S. Is substantially parallel to the suction main pipe 2 and is fixed to the outer periphery of the suction main pipe 2 by a plurality of fasteners 23, 23. The fasteners 23 have a band shape, and end portions thereof are connected to the suction main pipe 2. It is connected in a tightened state to the mounting portion 22A fixed to the head. A suction port 24 is provided on the opening 3 side of the submersible pump 21, and a discharge port 25 is provided on the side opposite to the opening 3 of the submersible pump 21 toward the base end. On the opening 3 side, which is the tip of the suction main pipe 2, an annular pressure adjusting pipe 26 is provided on the tip side of the elbow pipe 12 mounting position of the air pipe 11 so as to surround the suction main pipe 2. A plurality of compressed water injection pipes 27 are extended from the front end side of the pipe 26 to the front end side, and in this example, four compressed water injection pipes 27 are provided at equal intervals in the circumferential direction. This is a thin compressed water injection nozzle 27A. The discharge port 25 and the pressure adjusting pipe 26 are connected by a compressed water pressure feeding pipe 26A, and the compressed water pressure feeding pipe 26A, the compressed water injection pipe 27, and the pressure adjusting pipe 26 are made of a hard pipe such as a steel pipe. .

  As shown in FIG. 5, a hoisting ship 31 and a sediment transporting ship 32 constituting a dredger are arranged on a water surface 41 such as a sea, a lake, or a dam. The other end of the suction main pipe 2 is connected to a plurality of discharge pipes 6, 6... With flanges 4, and the other ends of the discharge pipes 6, 6. The female screw cylinder 13 of the air tube 11 is connected to a pneumatic feeding pipe 14 made of a flexible tube or the like. The pneumatic feeding pipes 14 are gathered together on the way and along the discharge pipe 6 the hoist ship 31. And connected to a compressor 16 as a compressed air supply source mounted on the hoist ship 31. The water surface portion of the discharge pipe 6 may be floated on the water surface 41 by a float (not shown). The submersible pump 21 is connected to a power control means 29 mounted on the hoist ship 31 via a power supply and control cable 28 so that the submersible pump 21 can be driven and controlled by the power control means 29. It has become. The cable 28 is routed along the discharge pipe 6.

  The hoisting ship 31 is equipped with a hoisting machine 31A having a hoisting arm 33, and the suction main pipe 2 or the discharge pipe 6 connected to the sucking main pipe 2 is lifted by the rope 34 of the hoisting arm 33.

  Further, in this example, the underwater suction / conveying device 1 is used for the construction method for removing the filling material of the caisson 51. As shown in FIG. 5, the caisson 51 is substantially latticed by a plurality of partition walls 52 and 53. There are a plurality of compartments 54 partitioned in a shape, and the bottom side of the compartments 54 is filled with a stone material as the filling material 55. This stone material includes one having a diameter of about 100 to 200 mm, and lighter sand (not shown) or the like is filled on the filling material 55 of the stone material. That is, since sand alone is insufficient in weight, the bottom is filled with a stone having a large specific gravity. In such a caisson 51, when it is necessary to remove the filling material 55 that is the suction object, removal work is performed. For example, due to a natural disaster, the caisson 51 on the underwater mound 56 is displaced from the underwater mound 56 on the bottom 42 and is restored. As shown in FIG. 5, the upper part covering the upper part of the caisson 51 ( (Not shown) is removed, and the upper portion of the compartment 54 is opened. Then, the suction main pipe 2 is inserted into the compartment 54 by the hoist ship 31, the opening 3 is disposed in the filling material 55, and the compressed water W is discharged from the compressed water injection nozzle 27A of the compressed water injection pipe 27. Collide. Thereby, the filling material 55 is loosened. On the other hand, when air A having a predetermined flow rate is ejected into the suction main pipe 2 from the air outlet 12A of the air lift pipe 11 upward, the water that has entered the excavation main pipe 2 is As a result, the apparent density is reduced, so that a water head pressure difference occurs between the water outside the suction main pipe 2 and the water. For this reason, the filling material 55 loosened by the compressed water W at the lower end of the suction main pipe 2 is sucked up into the suction main pipe 2 together with the compressed water W from the opening 3, mixed with the air A, and discharged from the upper end. The other end of the pipe 6 is discharged onto the earth transport ship 32.

  The scouring of the filling material 55 by the discharge of the compressed water W as described above and the sucking and discharging of the mixture of the compressed water W and the filling material 55 generated thereby are continuously performed. The filling material 55 is sucked, and the suction main pipe 2 is gradually lowered by the hoist ship 31 along with this. Then, if the filling material 55 is sucked and the water inside is removed, the caisson 51 is a bottomed box type. It can be moved to the position and filled again with the filling material 55 or the like to be settled.

  According to this construction method, the injection of the compressed water W is performed by the submersible pump 21 attached to the suction main pipe 2, so that the pipe of the compressed water W can be shortened, and the cost related to the material and maintenance can be reduced. Since the resistance is reduced, the capacity of the submersible pump 21 is not required to be relatively large. And even when solid matter is mixed in the underwater matter to be sucked, there is no hindrance to suction. This is because the mixture is not discharged through mechanical elements such as pump impellers. For example, although the diameter of the suction main pipe 2 is 300 mm, gravel and lump having a diameter of about 200 mm, which is about two-thirds, can be sucked. In the soil carrier 33, the water sucked together with the filling material 55 can be separated and purified, and then returned to the water again.

  Moreover, the compartment 54 is vertically long and narrow, and it is difficult to insert a grab bucket or the like. However, if there is a space for inserting the suction main pipe 2 and the submersible pump 21, the internal filling material 55 is sucked. Even if the filling material 55 is hardened, it can be disassembled into individual lumps as it is unwound by the injection of the compressed water W and removed by suction.

  And, by integrating the suction main pipe 2 and the submersible pump 21, a supply pipe for supplying the compressed water W becomes unnecessary, the cost is low, and it is advantageous particularly for work at a deep water depth. The piping resistance for supplying the compressed water is minimal, maintenance of the piping is unnecessary, and the pump performance is small. Further, with a simple configuration in which the suction main pipe 2 and the submersible pump 21 are integrated, the dredging device can be efficiently excavated and does not require skill in the work. In addition, the system is more resistant to obstacles such as solid matter than a device that uses a sand pump or a cutter. Furthermore, it can be hung on the hoist ship 31 so that it can be moved up and down. In addition to dredging, it can also be used for sampling of underground resources by excavation by injection of compressed water.

  Thus, in this embodiment, corresponding to claim 1, the suction main pipe in which the opening portion 3 is formed at one end to face the filling material 55 as the suction target in water and the discharge portion 5 is formed at the other end. 2 and a plurality of compressed water injection nozzles 27A and 27A arranged around the opening 3 toward the filling material 55 and connected to a compressed water supply source, and a compressor 16 as a compressed air supply source. In addition, in the underwater suction / conveyance device 1 provided with an air pipe 11 having an air outlet 12A connected to the suction main pipe 2, the compressed water supply source is the submersible pump 21, and the submersible pump 21 is connected to the suction main pipe. 2 Since it is provided on the opening 3 side of the outer periphery, the high-pressure compressed water W is discharged from the compressed water injection nozzle 27A to collide with the underwater filling material 55 facing the opening 3 of the suction main pipe 2, The filling material 55 is eroded and loosened to be lumped or liquefied. When air A having a predetermined flow rate is ejected from the air outlet 12A of the air lift pipe 11 into the water in the suction main pipe 2, the water in the suction main pipe 2 is lightened by mixing with the air A, and the water pressure is sucked. Since the pressure is lower than the water pressure outside the main pipe 2, the pressure difference (water head pressure) pushes the mixture of water and air A in the suction main pipe 2 upward. For this reason, the filling material 55 loosened by the discharge of the compressed water W is sucked up by the upward flow of the mixture and discharged from the discharge unit 5. In particular, since the injection of the compressed water W is performed by the submersible pump 21 attached to the suction main pipe 2, the pipeline of the compressed water W can be shortened, the cost related to the material and maintenance can be reduced, and the pipe resistance is low. Therefore, the capacity of the submersible pump 21 is not required to be relatively large.

  Thus, in this embodiment, corresponding to claim 2, the suction main pipe 2 is a straight pipe, the submersible pump 21 is substantially cylindrical, and the straight pipe and the shaft core of the submersible pump 21 are substantially connected. The submersible pump 21 is fixed in parallel, and the submersible pump 21 can be compactly integrated along the suction main pipe 2.

  Further, in this embodiment, in accordance with the third aspect of the present invention, the compressed water pressure feed pipe 26A, which is a pipe connecting the submersible pump 21 and the compressed water injection nozzle 27A, is made of a steel pipe that is a rigid pipe. Compared to a tube or the like, the durability is excellent, and even if the suction main pipe 2 is inserted in a relatively narrow portion, the compressed water pressure feeding pipe 26A which is a pipe line is hardly damaged and is highly reliable.

  Thus, in this embodiment, corresponding to claim 5, the filling material removing method of caisson 51 using the underwater object suction conveyance device 1 according to claim 1, wherein the suction object is in the caisson 51. The filling material 55 is a filling material 55. The filling material 55 is sucked into the filling material 55 by injecting compressed water W from the compressed water injection nozzle 27A and ejecting air A from the air outlet 12A. Since the material 55 is removed by being conveyed to the discharge part 5, the suction main pipe 2 is inserted into the existing caisson 51, and the internal filling material 55 is sucked from the opening 3 while being loosened by the compressed water W. Remove externally. In this method, when a caisson 51 such as an existing one is divided and the inside filling material 55 is solidified or accumulated, the suction main pipe 2 is inserted into the relatively narrow gap and the inside While loosening the filling material 55, it can be removed by suction.

  Further, as an effect on the embodiment, a plurality of straight discharge pipes 6 are connected to the suction main pipe 2, and a substantially straight pipe is provided between the underwater filling material 55 that is a suction target and the water surface 41. Since it is set as the part 7, it becomes easy to lift the straight piping part 7 by the hoist ship 31, and to align with a predetermined position. In addition, as shown in FIG. 5, the discharge pipe 6 bent about 90 degree | times is provided in the upper end of the straight piping part 7. As shown in FIG. Further, since the pressure adjusting pipe 26 is provided between the submersible pump 21 and the plurality of compressed water injection nozzles 27A, the compression grooves can be injected substantially uniformly from the plurality of compressed water injection nozzles 27A. Further, since the pressure adjusting pipe 26 is located at a position away from the opening 3, for example, at a position separated from the opening 3 by more than twice the diameter of the suction main pipe 2, the opening 3 is inserted into the suction object. Do not get in the way.

  FIG. 6 shows a second embodiment of the present invention. The same reference numerals are given to the same parts as those in the first embodiment, and detailed description thereof is omitted. The compressed water W is jetted from the compressed water jet nozzle 27A to loosen the sand and the like of the bottom 42 which is the suction target, while the air A is jetted from the air jet 12A and the sand and sand at the bottom 42 is sucked into the main pipe 2 The soil is sucked from the opening 3 and dredged to a predetermined depth, and the dredged earth and sand are discharged to the earth transport ship 32, unnecessary water is drained as necessary, the purified water is returned to the water, and the earth transport ship 32 Transport to destination.

  As described above, in this embodiment, in accordance with claims 1 to 3, the suction object is earth and sand of the bottom 42, and the same operations and effects as in the first embodiment are obtained. The example corresponds to claim 4 and is a dredging method using the underwater suction / conveyance device according to claim 1, wherein the suction object is earth and sand of the bottom 42, and compressed water is injected onto the earth and sand of the bottom 42. Since the compressed water W is ejected from the nozzle 27A and excavated, and the air A is ejected from the air outlet 12A, the earth and sand etc. of the bottom 42 are sucked, and the sucked earth and sand etc. are conveyed to the discharge part 5. While the compressed water W is sprayed and loosened on the soil in the night water, the soil can be sucked and sucked from the opening 3. In this method, it is possible to suck a large-sized one as compared with a conventional cutter and the like, and it is possible to cope with a dredging in which solid matter is mixed with earth and sand. The earth and sand include solids and gravel other than earth and sand.

  FIG. 7 shows a third embodiment of the present invention. The same reference numerals are given to the same parts as those of the above-mentioned embodiments, and detailed description thereof will be omitted. In this example, the foundation pile placed on the bottom 42 is shown. This is an example of removing the deposit 62 accumulated inside the steel pipe pile 61. The compressed water W is injected from the compressed water injection nozzle 27A to loosen the deposit 62 as the suction object, and the air A is discharged from the air outlet. The deposit 62 is sprayed from 12A and sucked from the opening 3 of the suction main pipe 2 to remove the deposit 62 in the steel pipe pile 61. Note that water is continuously supplied into the steel pipe pile 61 by working water supply means (not shown), and the water pump 21 sucks this water. The steel pipe pile 61 is a foundation pile or the like of an existing structure on the water. After removing the existing structure, the internal deposit 62 is removed, and the upper portion of the foundation pile 62 is cut.

  As described above, in this embodiment, the suction object is the deposit 62 in the steel pipe pile 61 corresponding to the first to third aspects, and has the same operations and effects as the first embodiment. Furthermore, in this embodiment, corresponding to claim 6, there is provided a method for removing deposits in a foundation pile using the underwater suction / conveyance device according to claim 1, wherein the suction object is in a steel pipe pile 61 as a foundation pile. The deposit 62 is sucked by sucking the deposit 62 by injecting the compressed water W from the compressed water injection nozzle 27A to the deposit 62 and ejecting the air A from the air outlet 12A. Is removed by transporting it to the discharge part 4, so that the suction main pipe 2 is inserted into the steel pipe pile 61, and the deposit 62 inside is sucked from the opening 4 while being loosened by the compressed water W and removed to the outside. To do. In this method, the suction main pipe 2 is inserted into a relatively narrow interior such as the underwater steel pipe pile 61, and the deposit 62 inside can be sucked and removed.

  FIG. 8 shows a fourth embodiment of the present invention. The same reference numerals are given to the same parts as those of the above-mentioned embodiments, and detailed description thereof is omitted. In this example, the steel pipe pile 61 as the foundation pile is the ground. In this example, the deposit 62 deposited in the steel pipe pile 61 is removed, and water 72 is continuously supplied into the steel pipe pile 61 by working water supply means (not shown). Then, the suction main pipe 2 is inserted together with the submersible pump 21 into the steel pipe pile 61 which is in an underwater atmosphere, the submersible pump 21 sucks the water 72, and the compressed water W is injected from the compressed water injection nozzle 27A. While loosening the deposit 62 as the suction object, air A is jetted from the air outlet 12A to suck the deposit 62 from the opening 3 of the suction main pipe 2, and the deposit 62 in the steel pipe pile 61 is removed. In this way, the internal deposit 62 is removed, and the upper portion of the foundation pile 62 is cut.

  As described above, in this embodiment, the suction object is the deposit 62 in the steel pipe pile 61 corresponding to the first to third aspects, and has the same operations and effects as the first embodiment. In the present embodiment, corresponding to claim 6, the suction object is the deposit 62 in the steel pipe pile 61 of the ground 71 as the foundation pile, and by supplying the working water into the steel pipe pile 61, the steel pipe pile This is a method of filling 61 with water and removing sediment 62 in the steel pipe pile 61, and has the same actions and effects as the third embodiment.

  In addition, this invention is not limited to the said Example, A various deformation | transformation implementation is possible. For example, various filling materials can be used. The foundation pile may be a pile other than the steel pipe pile as long as it is hollow.

BRIEF DESCRIPTION OF THE DRAWINGS It is the whole apparatus perspective view which shows Example 1 of this invention. It is a partially cutaway front view of the same as the above. FIG. 3 is a sectional view taken along line YY in FIG. It is a partially cutaway sectional view on the opening side of the apparatus. It is sectional drawing explaining a construction method same as the above. It is sectional drawing explaining the construction method which shows Example 2 of this invention. It is sectional drawing explaining the construction method which shows Example 3 of this invention. It is sectional drawing explaining the construction method which shows Example 4 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Underwater object suction conveyance apparatus 2 Suction main pipe 3 Opening part 5 Discharge part
12A Air outlet
14 Pneumatic pipe
16 Compressor (Compressed air supply source)
21 Submersible pump (compressed water supply source)
25 Discharge port
26A Compressed water pressure pipe (pipe)
27 Compressed water injection pipe
27A Compressed water injection nozzle
31 Hoist ship (dredge / ship)
32 Soil carrier (dredge / ship)
41 Water surface
42 Water bottom
51 Caisson
55 Filling material
61 Steel pipe pile (foundation pile)
62 Sediment W Drilling water A Air

Claims (6)

A suction main pipe having an opening formed at one end to face an underwater suction object and a discharge section formed at the other end, and connected to a compressed water supply source and around the opening toward the suction object In the underwater suction / conveyance device comprising a compressed water injection nozzle disposed in the air pipe and an air pipe connected to a compressed air supply source and having an air outlet connected to the inside of the suction main pipe, the compressed water supply source is A submersible pump, wherein the submersible pump is provided on the outer periphery of the suction main pipe. 2. The submersible pump is a straight pipe, the submersible pump is substantially cylindrical, and the submersible pump is fixed with the straight pipe and the axis of the submersible pump being substantially parallel to each other. The underwater object suction conveyance device described. The underwater suction / conveyance device according to claim 1 or 2, wherein a pipe line connecting the submersible pump and the compressed water injection nozzle is formed of a hard pipe. The dredging method using the underwater object suction conveyance device according to claim 1, wherein the suction object is bottom sediment or the like, and the compressed water is sprayed from the compressed water spray nozzle onto the bottom sediment or the like, and the air A dredging method characterized by sucking earth and sand at the bottom of the water by blowing air from a jet outlet, and dripping the sucked earth and sand into the discharge section. The caisson filling material removing method using the underwater suction / conveyance device according to claim 1, wherein the suction object is a filling material in a caisson, and compressed into the filling material from the compressed water injection nozzle. The caisson filling is characterized in that water is injected and air is ejected from the air outlet to suck the filling material and remove the sucked filling material by conveying it to the discharge section. Material removal method. It is the deposit removal method in the foundation pile using the underwater object suction conveyance apparatus of Claim 1, Comprising: The said suction object is a deposit in a foundation pile, and it compresses from the said compressed water injection nozzle to the said deposit The deposit in the foundation pile is characterized by sucking the deposit by jetting water and ejecting air from the air outlet, and removing the sucked deposit by conveying it to the discharge section. Removal method.

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