Work equipment

Abstract

To provide a work device capable of effectively compacting landfill material. [Solution] The work apparatus comprises a discharge device capable of holding the landfill material and releasing the held landfill material toward the seabed, a frame-shaped member having a hollow portion and positioned below the discharge device, and a pressing device that presses the landfill material with the discharge device while the frame-shaped member surrounds the landfill material.

Description

[Technical Field]

[0001] This invention relates to a work device. [Background technology]

[0002] Regarding ground improvement measures for reclaimed land, these are generally implemented after the reclamation is complete. However, if the layout plan for facilities and buildings within the reclaimed land is clear in advance, it is possible to shorten the construction period and reduce construction costs by implementing ground improvement measures such as liquefaction prevention, soil pressure reduction, and bearing capacity enhancement simultaneously with the reclamation.

[0003] As a method for creating a stable ground simultaneously with such reclamation, a pre-mixing treatment method is known in which a reclamation mixture, which is a mixture of soil and a stabilizer such as cement and a segregation inhibitor, is poured into water to create the reclamation base (see, for example, Patent Document 1).

[0004] In this type of pre-mixing treatment method, the soil particles are mixed with a stabilizing agent and fixed in place, and a separation inhibitor is added to prevent the separation of soil particles in water. As a result, the particles settle in a nodular form and accumulate on the seabed, creating a dense, stable, and robust reclaimed land base. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Special Publication No. 6-63213 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] When using the aforementioned mixed materials for landfill (landfill material), it is important to minimize variations in density and strength, and compaction of the landfill material is considered effective for this purpose. However, there have been no conventional proposals for compacting landfill material underwater, and no equipment exists that enables effective compaction.

[0007] On one side, an object of the present invention is to provide a working device capable of effectively compacting landfill materials.

Means for Solving the Problem

[0008] The first working device described in this specification includes a discharging device capable of holding a landfill material and discharging the held landfill material toward the bottom of the water, a frame-shaped member disposed below the discharging device and having a hollow portion, and a pressing device that presses the landfill material with the frame-shaped member surrounding the landfill material by the discharging device.

[0009] The second working device described in this specification includes a discharging device capable of holding a landfill material and discharging the held landfill material toward the bottom of the water, and a regulating member that is directly or indirectly connected to the discharging device and restricts movement of the discharging device in a direction different from the direction in which the landfill material is discharged toward the bottom of the water when at least the discharging device presses the landfill material at the bottom of the water.

Effect of the Invention

[0010] According to the working device described in this specification, landfill materials can be effectively compacted.

Brief Description of the Drawings

[0011] [Figure 1] FIG. 1 is a diagram showing an outline of a pre-mixing treatment method. [Figure 2] FIG. 2 is a graph showing the relationship between the dry density and strength (uniaxial compressive strength) of landfill materials (pre-mixed treated soil). [Figure 3] FIG. 3 is a diagram schematically showing the configuration of a workboat according to the first embodiment. [Figure 4] FIGS. 4(a) and 4(b) are enlarged views showing a clam shell bucket and a frame-shaped member 26. FIG. 4(a) shows a case where the clam shell bucket is in a closed state, and FIG. 4(b) shows a case where the clam shell bucket is in an open state. [Figure 5]Figure 5 shows a clamshell bucket in the closed state, viewed from below (-Z direction) of the frame-like member. [Figure 6] Figures 6(a) and 6(b) are diagrams (part 1) illustrating the method of using the clamshell bucket and frame-shaped member in the first embodiment. [Figure 7] Figures 7(a) and 7(b) are diagrams (part 2) illustrating the method of using the clamshell bucket and frame-shaped member in the first embodiment. [Figure 8] Figure 8 is a block diagram showing the construction management system of the crane device 20. [Figure 9] Figure 9 is a flowchart showing the processing of the control device. [Figure 10] Figure 10 shows an example of a screen displayed on the terminal's display unit. [Figure 11] Figures 11(a) to 11(c) are diagrams illustrating the second embodiment. [Modes for carrying out the invention]

[0012] 《First Embodiment》 The first embodiment will be described in detail below with reference to Figures 1 to 10. In this first embodiment, a method called the pre-mixing treatment method is used when reclaiming land underwater (such as the sea).

[0013] Figure 1 shows an overview of the pre-mixing treatment method. As shown in Figure 1, in the pre-mixing treatment method, first, a stabilizer such as cement is mixed with the soil (step S10). For this mixing treatment, for example, a rotary crushing and mixing method is used. The rotary crushing and mixing method is a method that enables crushing and mixing simultaneously by crushing and granulating soil using the impact and mixing performance of multiple flexible chains rotating at high speed inside a cylinder, and by uniformly dispersing the stabilizer.

[0014] In the above mixing process, a separation inhibitor is added to the mixed ground material (reclaimed land material). The separation inhibitor is used to suppress the separation of soil and stabilizers, and is, for example, a polyacrylamide-based polymer flocculant.

[0015] The landfill material, to which separation inhibitors have been added, is transported to a work vessel at sea (Step S12). Heavy machinery such as dump trucks and backhoes, as well as belt conveyors, are used for transport.

[0016] Subsequently, a work vessel is used to release the reclamation material into the water, and reclamation and construction are carried out (Step S14). In this pre-mixing treatment method, the soil particles are mixed with a stabilizing agent and fixed, and the separation of soil particles in the water is prevented by a separation inhibitor, causing them to settle in a nodular shape and accumulate on the seabed. Therefore, it is thought that a strong reclamation base with uniform density and stability can be created.

[0017] Figure 2 is a graph showing the relationship between the dry density and strength (uniconfined compressive strength) of the landfill material (pre-mixed soil). In Figure 2, C represents the cement addition rate. As shown in Figure 2, when the cement addition rate is constant, the strength (uniconfined compressive strength) of the landfill material increases as the dry density increases, and this increasing trend is parabolic. Thus, since a stronger landfill base can be created by increasing the density of the landfill base, if the landfill material released into the water in step S14 of Figure 1 can be compressed (compacted), the same strength can be obtained with a smaller amount of cement compared to when compaction is not performed, which would reduce cement costs and be more economical.

[0018] (Regarding the workboat) The following describes in detail a work vessel according to this first embodiment, which is equipped with a work device (crane device) capable of compacting the landfill material when it is released into the water.

[0019] Figure 3 schematically shows the configuration of the work vessel 100 according to the first embodiment. The work vessel 100 is also called a soil transport vessel, and as shown in Figure 3, it comprises a work vessel body 10 capable of loading landfill material in a cargo hold 12, and a crane device 20 as a work device installed on the work vessel body 10. In Figure 3, the vertical direction is defined as the Z-axis direction, and the two orthogonal axes in the horizontal plane are defined as the X-axis direction and the Y-axis direction.

[0020] The crane device 20 comprises a main body device 30, a boom 22 provided on the main body device 30, a clamshell bucket 24 as a release device, a frame-shaped member 26 provided below (-Z side) the clamshell bucket 24, and a wire 28 for suspending and holding the clamshell bucket 24. The main body device 30 has a cockpit (not shown) and can rotate around the Z axis in response to the operator's movements from the cockpit. The main body device 30 also adjusts the three-dimensional position of the clamshell bucket 24 and the frame-shaped member 26 by adjusting the posture, length, and elevation angle of the boom 22, and by adjusting the winding amount of the wire 28, in response to the operator's movements. The main body device 30 also performs opening and closing operations of the clamshell bucket 24 via a wire rope (not shown) in response to the operator's movements. With the clamshell bucket 24 in the open state in contact with the reclamation material in the ship's hold 12 (i.e., with the frame-shaped member 26 submerged in the reclamation material), the clamshell bucket 24 can be closed to hold the reclamation material. Furthermore, by opening the clamshell bucket 24 while it is holding the reclamation material underwater, the reclamation material can be released towards the seabed. In this first embodiment, as shown in Figure 3, a caisson (quay) 40 is installed in the sea in advance, and the +X side of the caisson 40 is reclaimed and constructed.

[0021] Here, the clamshell bucket 24 and the frame-shaped member 26 will be described in more detail. Figures 4(a) and 4(b) are enlarged views of the clamshell bucket 24 and the frame-shaped member 26. Figure 4(a) shows the clamshell bucket 24 in the closed state, and Figure 4(b) shows the clamshell bucket 24 in the open state.

[0022] As shown in Figure 4(a), the clamshell bucket 24 comprises a pair of bucket sections 56A and 56B connected via a hinge 55 so as to be openable and closable, an arm 54 connected to the bucket sections 56A and 56B, a base 52 to which the upper end (+Z side end) of the arm 54 is connected, and contact plates 58A and 58B provided on each of the pair of bucket sections 56A and 56B. The base 52 is suspended and held by a wire 28.

[0023] The bucket sections 56A and 56B form a space capable of holding the landfill material when closed (as shown in Figure 4(a)). A wire rope (not shown) is connected to a portion of the bucket sections 56A and 56B. When the wire rope is pulled upward, the bucket sections 56A and 56B transition from the closed state shown in Figure 4(a) to the open state shown in Figure 4(b). When the wire rope returns to its original state after being pulled upward, the bucket sections 56A and 56B transition from the open state shown in Figure 4(b) to the closed state shown in Figure 4(a).

[0024] Figure 5 shows the clamshell bucket 24 in the closed state as shown in Figure 4(a), viewed from below (-Z direction) of the frame-shaped member 26. As shown in Figure 5, the frame-shaped member 26 has a rectangular hollow section 126, and the contact plates 58A and 58B provided on the bucket sections 56A and 56B are sized to fit into the hollow section 126 of the frame-shaped member 26. As shown in Figures 4(a) and 4(b), the frame-shaped member 26 is suspended and held by the bucket sections 56A and 56B via a chain member 60 which serves as a suspension member.

[0025] Figure 6(a) shows a clamshell bucket 24 holding the landfill material being transported into the water, with the lower part of the frame-shaped member 26 in contact with the bottom of the water. In this first embodiment, with the lower part of the frame-shaped member 26 in contact with the bottom of the water, the clamshell bucket 24 opens from a closed state, and as shown in Figure 6(b), the landfill material is released into the hollow portion 126 of the frame-shaped member 26.

[0026] As shown in Figure 6(b), after the filler material is released into the hollow portion 126 of the frame-shaped member 26, the clamshell bucket 24 transitions from an open state to a closed state, as shown in Figure 7(a). Then, as the clamshell bucket 24 moves downward, the contact plates 58A and 58B come into contact with the filler material, as shown in Figure 7(b), and the clamshell bucket 24 compacts it under its own weight. At this time, the chain member 60 allows the clamshell bucket 24 to move vertically while the frame-shaped member 26 surrounds the filler material. This allows the filler material to be pressed by the clamshell bucket 24 while the frame-shaped member 26 surrounds it, that is, the filler material can be compacted while the frame-shaped member 26 limits the horizontal movement range of the filler material, improving compaction efficiency and efficiently increasing the density of the landfill base. This efficiently improves the strength of the landfill base. Furthermore, the frame-shaped member 26 functions as a restricting member that restricts the horizontal movement of the landfill material when the clamshell bucket 24 presses (compacts) the landfill material on the seabed.

[0027] Figure 8 is a block diagram showing the construction management system of the crane device 20. As shown in Figure 8, the construction management system comprises a management device 70, a GPS sensor 71, a lifting height meter 72, a load sensor 73, a control information acquisition unit 76, a storage unit 74, and a terminal 75.

[0028] The GPS sensor 71 is installed, for example, near the upper end of the boom 22 as shown in Figure 3, and measures the position (latitude and longitude) of the upper end of the boom 22 and transmits the measurement results to the management device 70.

[0029] The lifting meter 72 measures how many meters above or below the reference height (for example, the average sea level TP of Tokyo Bay) the clamshell bucket 24 is located, and transmits the measurement results to the control device 70.

[0030] The load sensor 73 measures the load on the wire 28 and transmits the measurement results to the control device 70. Based on the change in the load on the wire 28 (whether or not the load has decreased by the weight of the frame-shaped member 26), the control device 70 can determine whether or not the frame-shaped member 26 has come into contact with the bottom of the water.

[0031] The operation information acquisition unit 76 acquires the operator's operation information and transmits it to the management device 70. The operation information includes whether or not operations related to the movement of the clamshell bucket 24, opening and closing of the clamshell bucket 24, etc., were performed.

[0032] The control device 70 acquires information from the GPS sensor 71, the lifting meter 72, the load sensor 73, and the operation information acquisition unit 76, and transmits and displays information to the terminal 75 to assist the operator in operating the clamshell bucket 24 to the landfill material placement location (X, Y, Z), including opening and closing. The control device 70 also generates information indicating the location on the seabed where the landfill material has been released, and stores and manages this information in the storage unit 74. The control device 70 also generates a screen based on the information stored in the storage unit 74 and displays it on the terminal 75.

[0033] Terminal 75 is an information processing device such as a PC (Personal Computer) used by the operator of the crane device 20, and the display unit of terminal 75 can display the screen received from the management device 70.

[0034] (Regarding the processing by the control device 70) Next, following the flowchart in Figure 9, and referring to other drawings as appropriate, the processing of the control device 70 will be explained in detail.

[0035] When the process shown in Figure 9 begins, first, in step S20, the control device 70 refers to the information obtained from the operation information acquisition unit 76 and waits until the operator starts operating the machine. When the operator starts operating the machine, the process moves to step S22, where the control device 70 obtains information on the reclamation locations up to that point from the storage unit 74 and outputs it to the terminal 75. The control device 70 generates a screen that displays the planned reclamation area in three dimensions, for example, as shown in Figure 10. The control device 70 also refers to the storage unit 74 and, if information on locations where reclamation (and compaction) has already been completed is stored in the storage unit 74, adds that information to the screen in Figure 10 (for example, by showing the locations where reclamation has been completed with hatching). The control device 70 outputs the generated screen to the terminal 75.

[0036] Next, in step S24, the management device 70 acquires location information of the clamshell bucket 24 from the GPS sensor 71 and the lifting meter 72 and outputs it to the terminal 75. The terminal 75, for example, based on the location information of the clamshell bucket 24, adds the clamshell bucket 24 to the screen (a 3D image showing the area to be reclaimed) as shown in Figure 10.

[0037] Next, in step S26, the control device 70 waits until the frame-shaped member 26 reaches the bottom of the water. At this point, the operator operates the crane device 20 while checking the display unit of the terminal 75 to hold the landfill material loaded in the cargo hold 12 in the clamshell bucket 24, and moves the clamshell bucket 24 to above the position from which the landfill material is to be released. The operator also operates the crane device 20 to lower the clamshell bucket 24 toward the bottom of the water. At this time, the control device 70 monitors the measured value of the load sensor 73 and determines that the frame-shaped member 26 has reached the bottom of the water when the load on the wire 28 has decreased by the weight of the frame-shaped member 26 in the water (weight considering buoyancy) (step S26: affirmative). If the determination in step S26 is affirmative, the control device 70 proceeds to step S28. At the stage of moving to step S28, the clamshell bucket 24 and the frame-shaped member 26 are in the state shown in Figure 6(a).

[0038] When the process moves to step S28, the control device 70 notifies the terminal 75 of the timing for releasing the landfill material and the start of compaction. The display unit of the terminal 75 displays information (messages, etc.) to inform the worker that the timing for releasing the landfill material has arrived and that compaction should begin. Upon confirming this display, the worker operates the crane device 20 and, as shown in Figure 6(b), releases the landfill material toward the seabed. At the same time, as shown in Figure 7(a), the clamshell bucket 24 is closed, and then, as shown in Figure 7(b), the clamshell bucket 24 is lowered to perform compaction of the landfill material.

[0039] The number of times the clamshell bucket 24 is lowered is predetermined. Therefore, the control device 70 checks the number of times the clamshell bucket 24 has been lowered based on the operation information acquired from the operation information acquisition unit 76, and determines that compaction is complete when the predetermined number of times is reached (Step S30: Affirmative). Here, the control device 70 may also determine that compaction is complete when it detects that the landfill has reached a predetermined density using a method described later. In this case, the control device 70 may also notify the worker that compaction is complete via the display unit of the terminal 75.

[0040] When the process moves to step S32, the control device 70 stores the position information of the clamshell bucket 24 obtained from the GPS sensor 71 and the lifting meter 72 when compaction is completed in the storage unit 74 as information of the location where reclamation and compaction have been completed.

[0041] Next, in step S34, the control device 70 determines whether the process is complete or not. The determination in step S34 is affirmed if, for example, the worker inputs to the terminal 75 that the work is complete, or if all planned landfill and compaction are completed. On the other hand, if the determination in step S34 is negative, the process returns to step S20. After that, the above process is repeatedly executed until the determination in step S34 is affirmed.

[0042] In the first embodiment, the operator performs landfill and compaction in order from the position with the lowest elevation among the positions shown in FIG. 10. That is, after the operator discharges and presses (compacts) the landfill material from the clam shell bucket 24, the clam shell bucket 24 is moved in a direction different from the discharge direction (Z-axis direction) (in the XY plane direction) to discharge and press (compact) the landfill material. By doing so, it is possible to repeat the discharge and pressing (compaction) of the landfill material to different positions, so that landfill can be efficiently carried out.

[0043] (Method for determining that the landfill material has reached a predetermined density) Hereinafter, a method for determining that the landfill material has reached a predetermined density will be described.

[0044] (Treatment before discharging into water) (a) When the management device 70 holds the landfill material loaded in the ship's hold 12 with the clam shell bucket 24, the mass W of the held landfill material is measured using the load sensor 73. n , is measured.

[0045] (b) Here, the moisture content W of the landfill material (W) is expressed by the following formula (1). Note that the water content ratio w n is included in the daily management items of the landfill material and has been measured in advance. Also, W d(S) is the dry mass of the earth and sand. W (W) = W d(S) × w n / 100 …(1) Also, the dry mass W of the earth and sand and cement (stabilizer) contained in the landfill material d(S+C) is expressed by the following formula (2). Note that the cement addition rate α is assumed to be a known value. W d(S+C) = W d(S) × (1 + α / 100) …(2) The mass W of the landfill material measured in (a) t(S+C+W) is the sum of the moisture content W of the landfill material (W) and the dry mass W of the earth and sand and cement (stabilizer) contained in the landfill material d(S+C) Therefore, the mass W of the landfill materialt(S+C+W) From equations (1) and (2) above, it can be expressed by the following equation (3). W t(S+C+W) =W d(S) ×(1+α / 100+W n / 100) …(3) In other words, by rearranging equation (3) above, we get the dry mass W of the soil. d(S) This can be expressed by the following equation (3)'. W d(S) =W t(S+C+W) (1+α / 100+W) n / 100) …(3)'

[0046] (c) Therefore, the control device 70 measures the dry mass W of the soil before releasing the landfill material into the water. d(S) The dry mass W of the soil is calculated from equation (3)' above. d(S) From equation (2) above, the dry mass W of soil and cement (stabilizer) contained in the landfill material is d(S+C) Calculate it.

[0047] (Processing after release into water) (d) The control device 70 measures the height (thickness) H of the fill material inside the frame-shaped member 26 when the i-th compaction is performed. i The height H of the reclamation material is measured using the lifting meter 72. In this case, the control device 70 calculates the height H from the height measured by the lifting meter 72 in the state shown in Figure 6(a) and the height measured by the lifting meter 72 in the state shown in Figure 7(b). i It is possible to find this.

[0048] (e) In addition, the control device 70 measures the area A of the XY cross-section of the hollow portion 126 of the frame-shaped member 26. k Using this, from equation (4), the volume V of the landfill material (saturated state) (i)sat Calculate. V (i)sat =A k ×H i …(4)

[0049] (f) The control device 70 also sets the estimated moisture content W of the landfill material (saturated state) after the i-th compaction. WsatThis is the water content at saturation (obtained through prior testing). nsat Using this, we calculate it from the following equation (5). W Wsat =W d(S) ×w nsat / 100 …(5)

[0050] (g) The control device 70 also calculates the expected density γ of the landfill base (saturated state) after the i-th compaction. (i)sat This is calculated from equation (6) below. γ (i)sat =(W d(S+C) +W Wsat ) / V (i)sat …(6)

[0051] (h) The control device 70 then controls the threshold γ set in the prior formulation test. Lsat And, γ (i)sat Compare the two, and γ (i)sat ≥γ Lsat If this occurs, it is determined that the landfill has reached the predetermined density after the i-th compaction.

[0052] As can be seen from the above description, in this first embodiment, the main body device 30 functions as a pressing device in which the clamshell bucket 24 presses the landfill material while the frame-shaped member 26 surrounds the landfill material. In addition, in this first embodiment, a GPS sensor 71 and a lifting meter 72 are included to function as a position measuring device for measuring the three-dimensional position of the clamshell bucket 24.

[0053] As described in detail above, according to this first embodiment, the crane device 20 includes a clamshell bucket 24 capable of holding the landfill material and releasing the held landfill material toward the seabed, a frame-shaped member 26 positioned below the clamshell bucket 24 and having a hollow section 126, and a main body device 30 that presses the landfill material with the clamshell bucket 24 while the frame-shaped member 26 surrounds the landfill material. As a result, the landfill material can be pressed with the clamshell bucket 24 while the frame-shaped member 26 surrounds the landfill material, thereby improving compaction efficiency and efficiently increasing the density of the landfill base. This makes it possible to efficiently improve the strength of the landfill base.

[0054] Furthermore, according to this first embodiment, the crane device 20 includes a clamshell bucket 24 capable of holding the landfill material and releasing the held landfill material toward the seabed, and a frame-shaped member 26 indirectly connected to the clamshell bucket 24, which restricts the horizontal movement of the landfill material when the clamshell bucket 24 presses the landfill material toward the seabed. As a result, the landfill material can be pressed by the clamshell bucket 24 while the frame-shaped member 26 restricts the movement of the landfill material. This improves compaction efficiency and efficiently increases the density of the landfill base.

[0055] Furthermore, in this first embodiment, the frame-shaped member 26 is suspended and held by the clamshell bucket 24 via a chain member 60 below the clamshell bucket 24, and the chain member 60 allows the clamshell bucket 24 to move vertically while the frame-shaped member 26 surrounds the landfill material. That is, it is possible to move only the clamshell bucket 24 up and down within the length of the chain member. As a result, the frame-shaped member 26 moves vertically in accordance with the vertical movement of the clamshell bucket 24, and the movement of the frame-shaped member 26 vertically prevents a gap from forming between the frame-shaped member 26 and the bottom of the water. Therefore, it is possible to prevent the landfill material surrounded by the frame-shaped member 26 from leaking out of the frame-shaped member 26.

[0056] Furthermore, in this first embodiment, the clamshell bucket 24 is provided with contact plates 58A and 58B having a flat surface that contacts the fill material surrounded by the frame-shaped member 26. This makes it possible to uniformly press and compact the fill material surrounded by the frame-shaped member 26.

[0057] Furthermore, in this first embodiment, since the GPS sensor 71 and the lifting meter 72 measure the three-dimensional position of the clamshell bucket 24, the management device 70 can accurately manage where the landfill material was released and compacted.

[0058] In the first embodiment described above, the case in which the crane device 20 is operated by an operator was explained, but the crane device 20 is not limited to this, and may be automatically controlled by a control device. In this case, the control device should control the crane device 20 so that the landfill material is released to each position in Figure 10 in a predetermined order. Also, in the first embodiment described above, the case in which the crane device 20 is equipped with a cockpit was explained, but the crane device 20 is not limited to this, and the operator may operate the crane device 20 from an external location using a wireless control device without providing a cockpit on the crane device 20.

[0059] In the first embodiment described above, the case in which the frame-shaped member has a rectangular shape when viewed from the Z-axis direction was explained, but it is not limited to this. For example, the frame-shaped member may be circular or elliptical when viewed from the Z-axis direction, or may have other shapes. In this case, the shape of the contact plates 58A and 58B may be a shape corresponding to the shape of the hollow portion of the frame-shaped member.

[0060] In the first embodiment described above, the case in which contact plates 58A and 58B are provided on the clamshell bucket 24 was explained, but the contact plates 58A and 58B are not necessarily required.

[0061] 《Second Embodiment》 The second embodiment will be described below with reference to Figures 11(a) to 11(c). This second embodiment is characterized in that it uses a bottom-opening bucket 224 as a discharge device instead of the clamshell bucket 24 of the first embodiment.

[0062] As shown in Figure 11(a), the bottom-opening bucket 224 comprises a bucket body 231 and a bottom cover 234. The bucket body 231 is a roughly rectangular parallelepiped member extending in the Y-axis direction, with a hollow interior and a vertically penetrating design. The bottom cover 234 is a member for holding the filler material inside the bucket body 231. The bucket body 231 is suspended and held by a drive unit 228 acting as a pressing device via a suspension chain 230, and the entire bottom-opening bucket 224 moves up and down relative to the drive unit 228 by winding up or unwinding the suspension chain 230. The bottom cover 234 is opened and closed by the drive unit 228 via a wire 232.

[0063] The drive unit 228 is provided with a support member 236, which supports the frame-shaped member 226 (shown by a dashed line in Figure 11(a)) below the bottom-opening bucket 224. The support member 236 is made of, for example, steel, and the frame-shaped member 226 is supported by the support member 236 in a fixed positional relationship with the drive unit 228. The frame-shaped member 226 has a hollow portion, similar to the frame-shaped member 26 in the first embodiment.

[0064] When the bottom-opening bucket 224 is used to hold the landfill material, the bottom cover 234 is closed, and the landfill material is loaded into the bottom-opening bucket 224 from above using heavy machinery or a belt conveyor.

[0065] Figure 11(b) shows the bottom cover 234 of the bottom-opening bucket 224 open, with the frame-shaped member 226 in contact with the seabed. In this state shown in Figure 11(b), the landfill material is released towards the hollow portion of the frame-shaped member 226, and the landfill material is surrounded by the frame-shaped member 226.

[0066] Figure 11(c) shows the state in which the bottom cover 234 of the bottom-opening bucket 224 is closed, and the drive unit 228 moves the bottom-opening bucket 224 downward via the suspension chain 230, thereby compacting the landfill material. In this state, the frame-shaped member 226 surrounds the landfill material, and the landfill material can be pressed down by the weight of the bottom-opening bucket 224, thus improving compaction efficiency and efficiently increasing the density of the landfill base. This efficiently improves the strength of the landfill base.

[0067] Since the other components of the crane device 20 and the workboat 100 are the same as in the first embodiment, a detailed explanation will be omitted.

[0068] As described in detail above, the second embodiment includes a bottom-opening bucket 224 capable of holding the landfill material and releasing the held landfill material toward the seabed, a frame-shaped member 226 having a hollow section positioned below the bottom-opening bucket 224, and a drive unit 228 that presses the landfill material with the bottom-opening bucket 224 while the frame-shaped member 226 surrounds the landfill material. As a result, the landfill material can be pressed by the bottom-opening bucket 224 while the frame-shaped member 226 surrounds the landfill material, thereby improving compaction efficiency and efficiently increasing the density of the landfill base. This allows for efficient improvement of the strength of the landfill base.

[0069] Furthermore, according to this second embodiment, the frame-shaped member 226 restricts the horizontal movement of the landfill material when the bottom-opening bucket 224 presses against the landfill material at the bottom of the water, thereby improving compaction efficiency and efficiently increasing the density of the landfill base.

[0070] Furthermore, in this second embodiment, the drive unit 228 suspends and holds the bottom-opening bucket 224 and drives the bottom-opening bucket 224 in the vertical direction, and the frame-shaped member 226 is supported by the drive unit 228 in a fixed positional relationship with the drive unit 228. Even with this configuration, the frame-shaped member 226 can restrict the horizontal movement of the reclamation material when the bottom-opening bucket 224 presses against the reclamation material at the bottom of the water.

[0071] In addition, in the second embodiment described above, as in the first embodiment, a contact plate having a flat surface that contacts the filler material surrounded by the frame-shaped member 226 may be provided on the bottom cover 234 of the bottom-opening bucket 224.

[0072] The embodiments described above are preferred examples of the present invention. However, the invention is not limited thereto, and various modifications are possible without departing from the spirit of the invention. [Explanation of symbols]

[0073] 20. Crane equipment (working equipment) 24. Clamshell bucket (discharge device) 26. Frame-shaped member (regulating member) 30 Main unit (pressing device) 58A, 58B Contact Plate 60 Chain members (suspension members) 70 Management device 71 GPS sensor (part of a position measurement device) 72. Head gauge (part of a position measuring device) 126 Hollow part 224 Bottom-opening bucket (discharge device) 226 Frame-shaped member 228 Drive unit (pressing device)

Claims

1. A discharge device capable of holding the landfill material and releasing the held landfill material toward the seabed, A frame-shaped member having a hollow section is positioned below the aforementioned discharge device, A work device comprising: a pressing device that presses the landfill material with the discharge device while the frame-shaped member surrounds the landfill material.

2. The work device according to claim 1, wherein the discharge device discharges the landfill material toward the seabed after the frame-shaped member has reached the seabed.

3. The work apparatus according to claim 1, wherein the discharge device, after discharging the landfill material, moves in a direction different from the discharge direction and repeats the discharge.

4. The frame-shaped member is suspended and held by the discharge device via a suspension member below the discharge device. The work device according to claim 1, wherein the suspension member allows the discharge device to move vertically while the frame-shaped member surrounds the landfill material.

5. The work apparatus according to claim 1, wherein the pressing device has a crane for transporting the discharge device and the frame-shaped member.

6. The pressing device suspends and holds the discharge device and drives the discharge device in the vertical direction. The work apparatus according to claim 1, wherein the frame-shaped member is supported by the pressing device in a fixed positional relationship with the pressing device.

7. The work apparatus according to claim 1, further comprising a contact plate provided in the discharge device and having a surface that contacts the landfill material surrounded by the frame-shaped member.

8. The work apparatus according to any one of claims 1 to 7, further comprising a position measuring device for measuring the three-dimensional position of the discharge device.

9. The work apparatus according to claim 8, further comprising a management device that manages the discharge position of the landfill material by the discharge device based on the measurement results of the position measuring device.

10. A discharge device capable of holding the landfill material and releasing the held landfill material toward the seabed, A work device comprising: a regulating member directly or indirectly connected to the discharge device, which restricts the movement of the landfill material in a direction different from the direction in which it is discharged toward the seabed when the discharge device presses the landfill material toward the seabed.

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