Workboat barge

Abstract

To provide a barge type platform for a work barge further improving propulsion efficiency while efficiently forming an air layer in between a ceiling surface of a concave water flow groove and water.SOLUTION: A barge type platform for a work barge composed to navigate by installing a push boat at a rear end part of a non-self-navigation type hull not having a propulsion device and operated by power assistance is configured such that: a lower opening concave water flow groove is formed on a ship bottom from the rear end part of the hull to a stem; a front end part of the concave water flow groove is opened above the water line as well as formed in a divergent tapered configuration; right and left end edges are formed from the tapered base part to the rear in a divergent tapered configuration; a bow part position in a ship bottom part of the concave water flow groove rises at a sharp angle; a concave water flow groove ceiling surface in the rear of the risen bow part rises from the bottom part at a sharp angle; an inclined surface totally rising from the bow unit rear end to the rear of the ship bottom part is formed; and at the same time, the ship bottom part inclined surface of the concave water flow groove rising to an end of the concave water flow groove is positioned in water below the water line in navigation.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a barge for a work boat. [Background technology]

[0002] 2. Description of the Related Art Conventionally, a barge for a work boat has been known to have a structure equipped with a tunnel that runs along the bottom of the boat from the bow to the stern.

[0003] For such barges, a technology has been proposed that reduces sailing resistance and further improves propulsion efficiency by efficiently forming an air layer between the ceiling surface of the concave water flow channel and the water (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2020-168988 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the conventional technology, the ceiling surface of the concave water flow groove is tapered near the bow, widening towards the front and rear, and from the base of the taper the left and right edges extend parallel to the stern. As a result, as the length of the concave water flow groove increases, resistance increases and propulsion efficiency decreases. This creates a problem.

[0006] This invention was made in consideration of the above-mentioned problems, and aims to provide a barge for a work boat that further improves propulsion efficiency by forming the main body width of the concave water flow groove to have a tapered width that expands toward the stern, efficiently forming an air layer between the ceiling surface and the water. [Means for solving the problem]

[0007] This invention relates to a barge for a work boat that is configured to be operated by attaching a push boat to the aft end of a non-self-propelled hull that is operated by external power without a propulsion device, and that has a downward-opening concave water flow groove formed in the bottom of the hull from the aft end of the hull to the bow member, the front end of the concave water flow groove opening above the waterline and tapered so that the front end of the concave water flow groove widens toward the front and from the base of the taper the left and right edges also have a tapered shape that widens toward the rear, the bow position of the bottom of the concave water flow groove rises at a steep angle, the ceiling surface of the concave water flow groove behind the raised bow rises at a steeper angle than the bottom, forming an inclined surface that rises all the way from the aft end of the bow to the rear of the bottom, and the inclined surface of the bottom of the concave water flow groove that rises to the end of the concave water flow groove is configured to be submerged below the waterline when in operation. [Effects of the Invention]

[0008] According to the invention of claim 1, there is provided a barge for a work vessel that is configured to be operated by attaching a push boat to the aft end of a non-self-propelled hull that is operated by external power without a propulsion device, and a downward-opening concave water flow groove is formed in the bottom of the vessel from the aft end of the hull to the bow member, the front end of the concave water flow groove is opened above the waterline, and the front end of the concave water flow groove is formed in a tapered shape that widens towards the front, and from the base of the tapered section, the left and right edges are formed in a tapered shape that widens towards the rear, the bow position of the bottom of the vessel of the concave water flow groove rises at a steep angle, and the ceiling surface of the concave water flow groove aft of the raised bow rises at a steeper angle than the bottom, forming an inclined surface that rises all the way from the aft end of the bow to the rear of the bottom of the vessel, and the inclined surface of the vessel bottom of the concave water flow groove that rises to the end of the concave water flow groove is configured to be in the water below the waterline when in operation, which provides the following effects.

[0009] In other words, when the barge is in operation, air can be efficiently taken in along with water from the opening at the front end of the concave water flow groove. The taken-in air bubbles accelerate along the inclined surface of the concave water flow groove and escape to the rear end of the hull, allowing the accelerated water flow to be sent to the power of the push barge's propulsion device. This reduces the barge's running resistance, requiring less power or allowing it to move at higher speeds, which has the effect of contributing to energy conservation and higher speeds.

[0010] In addition, the inclined surface of the ship's bottom is designed to be located underwater below the waterline during operation, ensuring energy savings and increased speed even when the water surface is rough.

[0011] In particular, the front end of the concave water flow groove is tapered so that it diverges toward the front, and the left and right edges from the tapered base are tapered so that they diverge toward the rear, the bow portion of the bottom of the vessel rises at a steep angle, and the ceiling surface of the concave water flow groove behind the raised bow portion rises at a steeper angle than the bottom portion, forming a slope that rises all the way from the rear end of the bow to the rear of the bottom, so that even if the distance from the rear end of the hull to the bow member is long, the water flow taken in from the front end of the concave water flow groove can be sent to the power of the push barge's propulsion device without slowing down. Moreover, because the main body of the concave water flow groove is formed so that it diverges toward the stern, the water flow caused by propulsion sent to the power of the push barge's propulsion device diverges toward the rear, and this, together with the rearward diffusion of the water flow caused by the upward slope from the bow to the rear of the bottom of the vessel, assists the propulsion function of the push barge. This will ensure that even large barges can achieve energy savings and higher speeds.

[0012] Furthermore, when stopping the hull, the pusher's screw, a well-known technology, is rotated in the reverse direction to reduce the propulsive force that had been exerted up until then, thereby stopping the hull. When the screw rotates in the reverse direction, the water flows toward the tip of the bottom of the hull, providing a rearward propulsive force for the hull. However, the ceiling surface of the concave water flow channel behind the raised bow is angled at a steeper angle than the bottom, forming a slope that rises all the way from the rear end of the bow to the rear of the bottom of the hull. As a result, the water flow from the reverse-rotating screw hits the slope, slides smoothly along it, and flows toward the front end of the hull, providing a rearward propulsive force for the hull.

[0013] Furthermore, because the concave water flow groove is tapered to widen towards the stern, it can take in the water flow from the counter-rotating propeller at once and reliably from the expanding part of the tapered shape, allowing the barge to generate rearward propulsion with little power. Also, the water flow taken in by the concave water flow groove increases in flow velocity as it passes through the gradually narrowing groove, making it possible to generate even stronger rearward propulsion.

[0014] In this way, the barge of the present invention has a concave water flow groove with a tapered shape on the left and right sides from the rear end of the bow to the rear of the bottom of the vessel, and also has an inclined surface that rises all the way up, so that the bottom stopping mechanism can function smoothly despite the small amount of power required. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 2 is a bottom view showing an example of the configuration of a barge according to an embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view taken along line AA in FIG. [Figure 3] FIG. 2 is a cross-sectional view taken along line BB in FIG. [Figure 4] FIG. 10 is a plan view showing an example of the configuration of a barge in another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0016] The gist of this invention is to provide a barge for a work boat that is configured to be operated by attaching a push boat to the aft end of a non-self-propelled hull that is operated by external power without a propulsion device, and that has a downward-opening concave water flow groove formed in the bottom of the hull from the aft end of the hull to the bow member, the front end of the concave water flow groove opens above the waterline and is tapered so that the front end of the concave water flow groove is wider at the front and from the base of the taper the left and right edges are tapered so that they are wider at the rear, the bow position of the bottom of the concave water flow groove rises at a steep angle, the ceiling surface of the concave water flow groove behind the raised bow rises at a steeper angle than the bottom, and a slope that rises all the way from the aft end of the bow to the rear of the bottom of the hull is formed, and the slope of the bottom of the concave water flow groove that rises to its terminal end is positioned in the water below the waterline when in operation.

[0017] An embodiment of the present invention will be described in detail with reference to the drawings. Fig. 1 is a bottom view of a barge for a work boat according to this embodiment. Fig. 2 is a cross-sectional view taken along line A-A in Fig. 1. Fig. 3 is a cross-sectional view taken along line BB in Fig. 1.

[0018] The work boat barge 10 according to this embodiment is a work boat barge 10 configured to be operated by attaching a push boat T to the rear end 21 of a non-self-propelled hull 20 that is operated by external force without a propulsion device, and has a downward-opening concave water flow groove 30 formed in the bottom 23 from the rear end 21 of the hull 20 to the bow member 22, and the front end 31 of the concave water flow groove 30 opens above the waterline WL, and the front end 31 of the concave water flow groove 30 is formed in a tapered shape that widens at the front end, and from the tapered base 32 to the left and right end edges The concave water flow groove 30 is formed in a tapered shape that widens toward the rear, the bow 24 position of the ship's bottom 25 is raised at a steep angle, the ceiling surface 33 of the concave water flow groove 30 behind the raised bow 24 is raised at a steeper angle than the bottom, forming an inclined surface 34 that rises all the way from the rear end of the bow 24 to the rear of the ship's bottom 25, and moreover, the inclined surface 34 of the ship's bottom 25 of the concave water flow groove 30 that rises to the end of the concave water flow groove 30 is configured to be located in the water below the waterline WL during operation.

[0019] The work barge 10 according to this embodiment is a non-self-propelled type that does not have a propulsion device and moves under external power, as shown in Figures 1 and 2. Note that there are also self-propelled barges that have a propulsion device and move under their own power, and the present invention can also be applied to self-propelled barges.

[0020] Push boats T1 and T2 are installed at the rear end 21 of the hull 20 to enable operation. In this embodiment, two push boats T1 and T2 are arranged side-by-side in parallel, but the number can be increased to three or more as long as it does not cause problems for the navigation of the barge 10, or reduced to one, as in the hull 100 of another embodiment shown in Figure 4.

[0021] As shown in FIGS. 1 and 2, the barge 10 is provided with a concave water flow groove 30 that penetrates from the rear end 21 of the hull 20 to the bow member 22.

[0022] The front end 31 of the concave water flow groove 30 opens above the waterline WL and is tapered to widen toward the front. The concave water flow groove 30 is configured to rise at a steep angle at the bow 24 position of the ship bottom 25.

[0023] From the tapered base 32 of the concave water flow groove 30 that widens toward the front to the rear, the left and right edge portions of the concave water flow groove 30 are formed in a tapered shape that widens toward the rear. In addition, the bottom portion 25 of the concave water flow groove 30 rises at a steep angle from the position of the base 32, forming an inclined surface 34 that rises all the way from the rear end of the bow portion 24 to the rear of the bottom portion 25.

[0024] Furthermore, the end of the concave water flow groove 30 forming the rising slope 34 is configured to be located in the water below the waterline WL when the barge 10 is in operation.

[0025] 2 and 3, the barge 10 has a deck 26 on the top, and ship side members 27, 27 are connected to the deck 26 at both ends. The front area of ​​the deck 26 has a substantially arc-shaped planar shape, and the bow member 22 is attached to the front end thereof.

[0026] Furthermore, at the rear end 21 of the deck 26, a stern member 28 having a planar shape that is linear in the width direction is provided.

[0027] As shown in Figure 2, the bottom 23 of the hull 20 of the barge 10 varies from front to back, with bottom material 25c formed in a downward-forward direction from the stern material 28 to approximately 30% of the forward region of the hull 20, bottom material 25b formed in a generally horizontal direction from the front end of bottom material 25c to approximately 30% of the forward region of the hull 20, and bottom material 25a formed in a curved upward-forward direction from the front end of bottom material 25b to the front end of the hull 20, and furthermore, the tip 25d, which is the front end of the hull 20, rises vertically.

[0028] The bow member 22, deck 26, side members 27, 27, bottom members 25a, 25b, 25c, tip 25d, and bow member 22 are connected in a watertight manner. Furthermore, notched tow recesses 29, 29 are provided in the deck 26 and stern member 28 at the stern, into which tow boats T1, T2 are inserted so that they are parallel to the centerline connecting the bow member 22 and stern member 28 of the hull 20. As shown in Figure 2, the lower ends of the tow recesses 29, 29 are open.

[0029] In addition, the push boats T1 and T2 are configured so that a screw S, which generates propulsive force by rotating, is located at the rear lower part.

[0030] As shown in Figs. 1 to 3, the barge 10 is provided with a downward-opening concave water flow groove 30 that penetrates from the front of the pusher recesses 29, 29 to the bow member 22 area and along the bottom members 25a, 25b, 25c.

[0031] The ceiling surface 33 of the concave water flow groove 30 changes in height as it faces the ship bottom materials 25a, 25b, 25c, and the front end 31 is tapered to widen towards the front. The concave water flow groove 30 is provided symmetrically on both sides of the center line C, and the front end 31 opens above the waterline WL, rising at a steep angle at the bow 24.

[0032] In other words, the front end 31 of the concave water flow groove 30 opens into the air above the waterline WL, and forms a tapered front taper portion 36 that widens toward the tip of the front end 31, which is in the direction of travel of the hull 20 of the barge 10.

[0033] A rear tapered section 37 is formed, tapering outward from the base 32 located aft of the front tapered section 36 to the aft end 21 of the hull 20. The ceiling surface 33 of the aft tapered section 37 rises at a steep angle, forming an inclined surface 34 that rises entirely from the aft end of the bow 24 to the rear of the bottom 25.

[0034] Specifically, a front tapered section 36 that widens toward the tip is formed from the front end 31 of the concave water flow groove 30 to approximately 20% of the rear area of ​​the hull 20, and a rear tapered section 37 that widens toward the tip is formed from the base 32 of the front tapered section 36 to the rear end of the concave water flow groove 30.

[0035] In particular, by forming the rear tapered section 37 so that it gradually widens from the base 32 of the front tapered section 36 and making it an entirely upwardly sloping surface, the resistance to sending the water and air taken in from the front tapered section 36 rearward is made as low as possible, making it possible to send the water and air to the rear end 21 of the hull 20 without reducing their flow speed.

[0036] This allows a powerful current of water to be sent to the screw S of the push barge T installed at the rear end 21 of the hull 20, thereby reducing the running resistance of the barge 10 and enabling less power to be used or increasing speed, which contributes to energy conservation and speed increase.

[0037] Furthermore, when the hull 20 is stopped, the screw S of the push boat T is rotated in the reverse direction to reduce the propulsive force that had been exerted up until then, thereby stopping the hull. When the screw S is rotated in the reverse direction, the water flows toward the tip of the bottom 23 of the ship, providing a rearward propulsive force for the hull 20. However, the ceiling surface 33 of the concave water flow groove 30 behind the raised bow 24 is raised at a steeper angle than the bottom, forming an inclined surface 34 that rises all the way from the rear end of the bow 24 to the rear of the bottom 25 of the ship. As a result, the water flow from the reverse-rotating screw S hits the inclined surface 34, slides smoothly along the inclined surface 34, and flows toward the front end of the hull 20, providing a rearward propulsive force to the hull 20.

[0038] Moreover, since the concave water flow groove 30 is configured in a tapered shape that widens toward the stern located at the rear end 21 of the hull 20, the concave water flow groove 30 reliably takes in the water flow from the reverse-rotating screw S, and the barge 10 can obtain rearward propulsion with little power. In addition, the water flow taken in by the concave water flow groove 30 increases in flow velocity as it passes through the gradually narrowing groove, thereby making it possible to further strengthen the rearward propulsion force.

[0039] Therefore, by providing the concave water flow groove 30 of the above configuration on the barge 10, the left and right edges are formed in a tapered shape that widens from the rear end of the bow to the rear of the bottom of the ship, and the entire surface is formed into an inclined surface that rises upward, which combines to create a smooth hull stopping effect even with a particularly small amount of power.

[0040] In the barge 10 configured as described above, two push boats T1 and T2 are fitted into the push boat recesses 29 and 29 of the barge 10, and when the screws S of the push boats T1 and T2 are driven to rotate by power, the barge 10 is propelled forward by the propulsion force. Note that the waterline WL shown in Figure 2 represents that during operation.

[0041] When the barge 10 is in operation, wave resistance occurs to the barge 10, but the action of the concave water flow groove 30 reduces the resistance of the barge 10 and also improves the propulsion efficiency of the push boats T1 and T2. As a result, the barge 10 can be operated with reduced power output of the push boats T1 and T2 compared to when the barge 10 does not have the concave water flow groove 30.

[0042] In addition, the front end 31 of the concave water flow groove 30 opens above the waterline WL, the front end 31 of the concave water flow groove 30 is formed in a tapered shape that widens towards the front, the left and right edge portions from the tapered base 32 are formed in a tapered shape that widens towards the rear, the bottom 25 of the ship 25 at the bow 24 position of the concave water flow groove 30 rises at a steep angle, and the ceiling surface 33 of the concave water flow groove 30 behind the raised bow 24 rises at a steeper angle than the bottom, forming an inclined surface 34 that rises all the way from the rear end of the bow 24 to the rear of the bottom 25 of the ship, and moreover the inclined bottom surface 34 of the concave water flow groove 30 that rises to the end of the concave water flow groove 30 is configured to be located in the water below the waterline WL during operation, thereby producing the following effects.

[0043] That is, when the barge 10 moves forward at a certain speed, the water flow and air hit the hull 20 relative to this forward movement and effectively flow in through the opening at the front end 31 of the concave water flow channel 30 .

[0044] In addition, the air flowing in from the front end 31 of the concave water flow groove 30 forms bubbles on the ceiling surface 33, and as the bubbles flow from the front to the rear of the concave water flow groove 30, they are accelerated by the entirely upward inclined surface 34 from the rear end of the bow 24 to the rear of the bottom 25, which has the effect of reducing sailing resistance.

[0045] The front end 31 of the downward-opening concave water flow groove 30 is opened above the waterline WL on the bottom 23 of the ship from the rear end 21 of the hull 20 to the bow member 22, so that air is effectively sucked in from the opening by wind pressure while sailing and is introduced into the ceiling surface 33 of the concave water flow groove 30 to form air bubbles, which reduces sailing resistance, saves fuel, and increases the ship's speed.

[0046] Furthermore, as the air bubbles flow from the base 32 of the concave water flow groove 30 to the rear of the ship bottom 25, the left and right edge portions of the concave water flow groove 30 are formed into a tapered shape that widens toward the end, and the entire surface is formed into an upwardly sloping inclined surface 34, so that the air bubbles are accelerated toward the rear, and the accelerated water flow is sent to the screw S of the push barge T. This reduces the running resistance of the barge, requires less power, or allows for faster speeds, which has the effect of contributing to energy conservation and higher speeds.

[0047] 1 and 2, the push boats T1 and T2 are stored and installed so as to fit into push boat recesses 29, 29 that are drilled so as to face the rear end 35 of the concave water flow channel 30. The push boat recesses 29, 29 are drilled so as to penetrate from the deck 26 to the bottom 23 of the ship, and the push boats T1 and T2 fit into the push boat recesses 29, 29 in a floating state.

[0048] The tow boats T1 and T2 have arc-shaped tips, and they abut linearly across their entire width against the towable portion 29a formed in an arc-shaped shape in the tow boat recess 29 on the hull 20 to correspond to this, and both sides of the tow boats T1 and T2 are sandwiched between the side walls 29b and 29b of the tow boat recess 29.

[0049] This allows the push boats T1 and T2 to generate forward hydraulic force while sandwiched between the side walls 29b, 29b of the push boat recess 29 without touching each other laterally. The tips of the push boats T1 and T2 contact the arc-shaped pushed portion 29a in a linear manner over the entire length, so that the thrust is not concentrated at a point and can be transmitted smoothly to the hull 20. Also, by varying the thrust of the push boats T1 and T2, the direction of the hull 20 can be changed. [Explanation of symbols]

[0050] 10 barges 20 Hull 21 Rear end 22 Prow material 23 Ship's Bottom 24 Fore part 25 Bottom of the ship 26 Deck 27 Ship's side 28 Stern timber 29 Push boat recess 30 Concave drainage groove 31 Front end 32 Base 33 Ceiling surface 34 Slope 35 Rear end 36 Front tapered section 37 Rear tapered section T1, T2 Oshifune WL waterline S screw

Claims

[Claim 1] A barge for a work boat configured to be operated by installing a push boat at the rear end of a non-self-propelled hull that is operated by external power without having a propulsion device, A downwardly opening concave water flow groove is formed on the bottom of the hull from the rear end to the bow material, The concave flow channel is The front end of the hull is open above the waterline, and the front end is a tapered portion that tapers toward the front, and the rear end is a tapered portion that tapers toward the rear from the base of the taper of the front end to the left and right edges of the rear, A barge for a work vessel configured such that the length of the front tapered section in the longitudinal direction is shorter than the length of the rear tapered section in the longitudinal direction, while the taper angle of the rear tapered section is gentler than that of the front tapered section, so that the bow position of the bottom of the vessel of the concave water flow groove rises at a steep angle, and the ceiling surface of the concave water flow groove behind the raised bow rises at a steeper angle than the bottom, forming an inclined surface that rises all the way from the rear end of the bow to the rear of the bottom of the vessel, and further, the inclined surface of the vessel bottom of the concave water flow groove that rises to the end of the concave water flow groove is positioned in the water below the waterline during operation.

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