JP5554366B2 - Top end surface leveling method, submarine foundation construction method, and top end surface leveling system - Google Patents

Description

  The present invention relates to a top surface leveling method, a bottom surface foundation construction method, and a top surface leveling system according to construction of a seabed foundation constructed on the seabed in order to lay a heavy structure such as a breakwater on the sea.

  Conventionally, when a heavy structure such as a breakwater (harbor structure) is laid on the sea, the foundation of the heavy structure (the seabed foundation) is constructed on the seabed. A large number of relatively large stones (rubble) having a weight of several tens to several thousand kg and a peripheral length of 1 to 2 m are thrown into the seabed to form a mount-type rubble foundation. Crush and smooth the top and slopes of this rubble foundation. The seabed foundation mentioned here is the result of squeezing and leveling the top and slopes.

  The rubble foundation is a large pile of rubble thrown into the seabed, so it must be hardened so as not to collapse by the installation of the port structure, and the installation stability of the port structure is secured. In order to do this, it is necessary to level the top end surface that is the mounting surface of the harbor structure.

  For example, as described in Patent Document 1, the top end surface is a weight in which a steel ingot is attached to the lower end of a rod having a bottom surface of several meters square, which is assembled in a truss shape with a steel angle. This is a process of leveling while crushing the top of the rubble foundation (see Patent Document 1). The weight of the weight is about 50 t. Specifically, as described in Patent Document 1, the upper end of a weight is connected to a crane of a hoist mounted on a hoist ship, and the weight is lifted by several tens of centimeters above the top end surface of the rubble foundation. The process of lifting and dropping the lifted weight onto the top end surface is repeated, and the top end surface is leveled while being solidified. Moreover, by changing the position of the top end surface where the weight is dropped, the entire top end surface of the rubble foundation is squeezed and the top end surface is leveled to a predetermined construction height.

  In addition, for the slope of the rubble foundation, a plate-like slope leveling member connected to the pedestal placed on the top end face so as to be able to rotate freely in the direction of lifting from the slope, It is connected to a crane, the slope leveling member is lifted by the heavy machinery, and the process of dropping the lifted slope leveling member onto the slope is repeated, and the slope is leveled while being solidified (see Patent Document 2) ).

Japanese Patent Laid-Open No. Sho 62-31593 Japanese Patent No. 3445255

  However, in the step of tamping and leveling the top end surface of the rubble foundation, the height of the top end surface obtained by dropping the weight and solidifying and leveling must be set to a predetermined construction height.

  For this reason, as shown in Patent Document 1, each time the weight is dropped, the height of the mark attached to the weight is set with the lower end of the weight placed on the top end surface. Check with a standard installed on the land by the worker. The worker notifies the height of the confirmed mark (or the top end surface) to another worker who is operating the hoist mounted on the hoist ship with a communication device such as a transceiver. If the notified height of the top end surface does not reach the construction height, another operator who operates the hoist lifts the weight with the crane of the hoist and drops it.

  Thus, each time the weight is dropped on the top end surface, an operator who checks the height of the mark attached to the weight with a leveling tool has to be arranged on the land. Further, in the leveling of the top end surface, as described above, the lifting and dropping of the weight are repeated many times at the same place. Moreover, in order to level the whole top end surface, the position where the weight is dropped is also performed at a plurality of locations. Therefore, the number of times the weight is dropped on the top end surface during the top end surface leveling process is very high, and land workers check the height of the mark attached to the weight dropped on the top end surface with a standard. There are many times to do. For this reason, in the leveling process of the top end surface, a land worker confirms the height of the mark attached to the weight with a leveling tool, and notifies this to another worker who is operating the hoist. A large percentage of time was spent.

  The purpose of the present invention is to reduce the burden on the operator, efficiently reduce the work time required for the leveling process of the top end surface, shorten the construction period of the submarine foundation, and reduce the labor cost for the construction. The object is to provide a top surface leveling method, a seabed foundation construction method, and a top surface leveling system that can reduce costs.

  The top end surface leveling method of the present invention is configured as follows in order to solve the above-described problems and achieve the object.

  The top end surface leveling method according to the present invention is a method of solidifying and leveling the top end surface of a rubble foundation formed by throwing rubble into the seabed. The rubble foundation is a mount made of rubble thrown into the seabed.

  The top end surface leveling method repeats the first step to the third step shown below to squeeze the top end surface of the rubble foundation at the construction height and level it.

  In the first step, with the bottom end of the weight mounted on the hoist ship at sea placed on the top surface of the rubble foundation, the height of the collimation mark attached to the weight was measured on the ground. Measure with a range finder and output the measured height wirelessly. As a distance measuring horn, there is a so-called automatic tracking type total station that uses a reflecting prism as a collimation mark and automatically recognizes and tracks the reflecting prism. If this automatic tracking type total station is used, it is not necessary to arrange an operator who measures the height of the collimation mark attached to the weight and notifies the measured value to the hoist ship side on the land side.

In the second process, the information processing device mounted on the hoist ship receives the measurement height of the collimation landmark output by the distance measuring horn wirelessly, and the current height of the top surface of the rubble foundation at the present time, And about this top end surface, the residual adjustment height which is a difference of the present height and predetermined construction height is calculated, and the calculated present height and residual adjustment height are displayed on a display. Further, in the second step, in addition to the above-described current height of the top end face and the remaining adjustment height, the lifting height for lifting the weight in the third step described later is calculated, and the lifting height is also information. Display on the display of the processor. Therefore, the operator who operates the hoist mounted on the hoist ship can not only confirm the current height of the top end face and the remaining adjustment height by the display on the display unit, but also in the third step. You can check the approximate height of lifting the weight.

  In the third step, the weight is lifted by a hoist mounted on a hoist ship, and the lifted weight is dropped on the top end surface.

Thus, the weight is dropped on the top end surface, the current height of the top end face and a remaining adjustment height, Ru can effectively reduce the time required to be confirmed to the operator doing the driving operation of the hoist.

The display device information processing apparatus, the current height of the top end face as described above, and in addition to the remaining adjustment height, are lifted high or else displayed lifting the weight in the third step.

For this reason, the operator who is operating the hoist can be made to recognize the standard of the height at which the weight is lifted. Therefore, it is possible to efficiently reduce the work time required for the process of leveling the top end surface and shorten the construction period of the submarine foundation.

The lifting height of the weight is the difference between the height of the collimation landmark measured last time in the first step and the height of the collimation landmark measured this time in the first step after execution of the third step. The remaining adjustment height obtained from the height of the collimation mark measured this time in the first step after execution of the third step and the lifting height of the weight previously determined are calculated. The adjustment height this time is the amount by which the top end face is pushed down with respect to the energy applied to the top end face due to the fall of the weight. The previously determined lifting height of the weight is proportional to the amount of energy applied to the top end surface by the falling of the weight. The remaining adjustment height is an amount that requires the top end surface to be pushed down at the present time.

From this, for example, when the adjustment height this time is A, the lifting height of the weight determined last time is B, and the remaining adjustment height is C, in the second step, the lifting height of the weight is
Weight lifting height = (A x C) / B
What is necessary is just to calculate by calculation by. In addition, since the rubble foundation is solidified by repeating the third step, the amount by which the top end surface is pushed down per unit energy applied to the top end surface is reduced. Therefore, in the second step, the lifting height of the weight is determined using a proportional constant α (α> 1),
Weight lifting height = α × (A × C) / B
More preferably, it is calculated by the calculation according to. Since α varies depending on the condition of the seabed soil that forms the rubble foundation, the proportional constant α is not fixed, but an initial value (for example, α = about 1.1) is determined and the above-mentioned first You may change using the adjustment height this time obtained for every period of a process-3rd process, and the lifting height of the weight determined last time.

Further, the hoist mounted on the hoist ship may be configured to perform an automatic operation for lifting and dropping the weight based on the calculated lifting height.

  Moreover, the submarine foundation construction method concerning this invention performs a rubble foundation formation process and a slope leveling process in addition to the top edge leveling process by the above-mentioned ceiling leveling method.

  In the rubble foundation forming process, rubble is thrown into the seabed to form a rubble foundation. This rubble foundation is a mount made of rubble thrown into the seabed.

  In the slope leveling process, the slope of the rubble foundation formed in the rubble foundation formation process is leveled and the slope of the rubble foundation is squeezed.

  According to the present invention, the burden on the operator can be reduced, and the work time required for the step of leveling the top end surface can be efficiently reduced. Therefore, the construction period of the submarine foundation can be shortened, and costs such as labor costs for construction can be reduced.

It is the schematic which shows a hoist ship. It is the schematic of the system which constructs a submarine foundation by the submarine foundation construction method concerning this example. It is a flowchart which shows the construction process of a submarine foundation. It is a figure explaining the process of forming a rubble foundation. It is a figure explaining the smoothing process of a top end surface. It is a flowchart explaining the smoothing process of a top end surface. It is a figure which shows the rubble foundation which leveled the top face. It is a figure explaining the leveling process of a slope. It is a figure which shows the constructed submarine foundation.

  Hereinafter, a submarine foundation construction method according to an embodiment of the present invention will be described.

  FIG. 1 is a schematic view showing a hoist ship used in construction of a submarine foundation by the submarine foundation construction method according to this example. A hoist ship 1 shown in FIG. 1A has a grab bucket 2 attached to a crane provided in the hoist 10. The hoisting ship 1 shown in FIG. 1A performs a step (corresponding to a rubble foundation forming step referred to in the present invention) related to the formation of a rubble foundation. Moreover, the hoist ship 1 shown to FIG. 1 (B) has attached the weight 3 to the crane with which the hoist 10 is provided. The weight 3 is obtained by assembling a steel angle in a truss shape and attaching a steel ingot to the lower end of a rod having a bottom surface of several meters square. The hoist ship 1 shown in FIG. 1 (B) performs the step of crushing and leveling the top end surface of the rubble foundation (corresponding to the top end surface leveling method and the top end surface leveling step referred to in the present invention). . A reflection prism 25 is attached to the weight 3. The reflecting prism 25 corresponds to a collimation marker referred to in the present invention. The reflecting prism 25 is attached to a location located above the sea level in the step of leveling the top surface of the rubble foundation described later.

  In addition, the hoist ship 1 shown to FIG. 1 (A) and FIG. 1 (B) may be the same hoist ship 1, and different hoist ship 1 may be sufficient as it. That is, when the same hoist ship 1 is used, the grab bucket 2 or the weight 3 may be selectively attached to a crane provided in the hoist 10. Moreover, in FIG. 1, although it does not show in figure about the hoist ship 1 which performs the process of the leveling of a rubble foundation, it has shown in FIG. The hoist ship 1 that performs the slope leveling process of the rubble foundation may be the same as the hoist ship 1 shown in FIGS. 1 (A) and 1 (B).

  FIG. 2 is a schematic diagram of a system for constructing a submarine foundation by the submarine foundation construction method according to this example. This system includes a hoist 10, an information processing device 20, and a ranging finder 30. The hoist 10 and the information processing apparatus 20 are installed in the hoist ship 1. The ranging finder 30 is installed on land. In addition, the hoist ship 1 is also provided with a device that measures the position (latitude, longitude, altitude) of the ship using GPS (not shown). The ranging finder 30 also has a GPS function for measuring the installation position of the device (latitude, longitude, altitude).

  The hoist 10 includes a driving operation unit 11, an input / output unit 12, and an operation control unit 13. The driving operation unit 11 includes a handle, a lever, a pedal, and the like for driving the crane. An operator (driver) operates a crane by operating a handle, a lever, a pedal, and the like. The input / output unit 12 inputs and outputs data with the information processing apparatus 20. The operation control unit 13 controls the operation of the crane. The operation control unit 13 turns the crane or lifts or drops the grab bucket 2 or the weight 3 attached to the crane according to the operation operation of the operator in the operation operation unit 11. The operation control unit 13 also includes an automatic operation function for automatically operating the crane in accordance with an instruction from an external device (in this case, the information processing device 20).

  The information processing apparatus 20 includes a general personal computer (PC), and includes a control unit 21, a display / operation unit 22, an input / output unit 23, and a wireless communication unit 24. The control unit 21 controls the operation of each unit of the information processing apparatus 20 main body and performs arithmetic processing as necessary. The display / operation unit 22 includes an input device such as a keyboard and a mouse, and a display. The input / output unit 23 performs data input / output with the hoist 10. The wireless communication unit 24 performs wireless communication with the ranging finder 30.

  The ranging finder 30 is an automatic tracking type total station that uses a reflecting prism 25 as a collimation mark and automatically recognizes and tracks the reflecting prism 25. Since this automatic tracking type total station is sold by various manufacturers, it will be briefly described here.

  The ranging finder 30 includes a control unit 31, a ranging unit 32, and a wireless communication unit 33. The control unit 31 controls the operation of the distance measuring horn 30 main body. The distance measuring unit 32 automatically recognizes and tracks the reflecting prism 25 and measures the position (latitude, longitude, altitude) of the reflecting prism 25. The wireless communication unit 33 performs wireless communication with the information processing apparatus 20.

  In addition, since the ranging finder 30 has the GPS function as described above, it can detect the position (latitude, longitude, altitude) where the device is installed. Accordingly, the latitude, longitude, and altitude of the reflecting prism 25 measured by the distance measuring unit 32 can be calculated based on the position where the own device detected by the GPS function is installed.

  Next, the construction process of the submarine foundation will be described. FIG. 3 is a flowchart showing the construction process of the submarine foundation.

  First, a rubble foundation is formed at a place where a submarine foundation is to be constructed (s1). Next, the top end face of the rubble foundation formed in s1 is solidified and the top end face is leveled (s2). Finally, the slope of the rubble foundation is solidified and the slope is leveled (s3). s1 corresponds to the rubble foundation forming process referred to in the present invention, s2 corresponds to the top face leveling process referred to in the present invention, and s3 corresponds to the slope leveling process referred to in the present invention. Moreover, s2 is an embodiment of the top face leveling method according to the present invention.

  The process of forming the rubble foundation according to s1 will be described in detail. The rubble foundation formed in s1 becomes the basis of the submarine foundation to be constructed. A rubble foundation is formed by a hoist ship 1 in which a grab bucket 2 is attached to a crane provided in the hoist 10 shown in FIG.

  In s1, a rubble foundation is formed in a place where a seabed foundation is formed. Since the hoist ship 1 is equipped with the GPS device as described above, it is possible to determine the place where the rubble foundation is formed based on the position of the ship detected by the GPS device. As is well known, a rubble foundation is one in which a large number of relatively large stones with a weight of several tens to several thousand kg and a peripheral length of 1 to 2 m are thrown into the seabed to form a mount. (See FIG. 4). The rubble thrown into the seabed is loaded on this hoist ship 1 and other ships.

  The operator operates the hoist 10 and repeats the process of picking up the stone material loaded on the hoist ship 1 and other ships with the grab bucket 2 attached to the crane and throwing it into the seabed, and the rubble foundation on the seabed. Form.

  In s1, a submarine foundation having a size corresponding to the size of the submarine foundation to be constructed is formed. Specifically, a rubble foundation that is several tens of cm to 1 m larger than the submarine foundation to be constructed is formed as a whole. Moreover, in s1, large unevenness of 1 m or more is also corrected with respect to the formed rubble foundation. Specifically, a diver diving in the sea performs visual confirmation of the formed rubble foundation, and if there is a large unevenness of 1 m or more, notifies the operator (crane operator) of that. In accordance with instructions from the diver, the crane operator performs a driving operation such as inputting a new stone or removing the stone at the location where the unevenness has occurred. After this, a stringer is installed with rebar and water thread.

  FIG. 4 shows an example of a rubble foundation whose top end surface is lower than the sea surface and entirely located in the sea, and the top end surface can be formed higher than the sea surface.

  Next, the step of tamping and leveling the top end surface of the rubble foundation according to s2 will be described. In this step, the distance measuring horn 30 is used. The ranging finder 30 is installed on land as shown in FIG. Further, the leveling of the top end surface is performed by a hoist ship 1 to which a weight 3 is attached as shown in FIG. This hoist ship 1 may be one in which the grab bucket 2 attached to the hoist 10 is replaced with the weight 3 in the hoist ship 1 used in the step of forming the rubble foundation described above.

  The leveling of the top edge of the rubble foundation is located on one side (the open ocean side or the land side) from this center line, with reference to the center line that divides the submarine foundation to be divided into the land side and the open ocean side. Solidify and level the top edge area. When the leveling of the entire area of the top end face located on one side is completed, the area of the top end face located on the other side is solidified.

Moreover, since the range which can be leveled at a time is restrict | limited by the magnitude | size of the bottom face of the weight 3, it cannot be overemphasized that the whole top end surface of a rubble foundation is leveled, changing a leveling range.

First, the operator determines the leveling range of the top face of the rubble foundation. The leveling range determined here is a range in which the bottom surface of the dropped weight 3 is brought into contact with and rolled. That is, the leveling range determined here is the size of the bottom surface of the weight 3. As described above, the entire top surface of the rubble foundation is leveled while changing the leveling range.

FIG. 6 is a flowchart for explaining steps related to leveling of the top end face in the determined leveling range.

  The operator operates the hoist 10 to adjust the bottom surface of the weight 3 to the determined leveling range (s11). In s11, the operator operates the crane of the hoist 10 so that the center of the bottom surface of the weight 3 is positioned immediately above the center position of the determined leveling range in the operation operation unit 11. Then, the operator lowers the weight 3 suspended from the crane of the hoist 10 until the bottom surface of the weight 3 comes into contact with the top end surface of the rubble foundation and is placed.

  The ranging finder 30 installed on land starts automatic tracking of the reflecting prism 25 attached to the weight 3 in the ranging unit 32. In addition, the ranging finder 30 starts processing for transmitting the position (latitude, longitude, altitude) of the reflecting prism 25 detected by the wireless communication unit 33 in the ranging unit 32 to the information processing apparatus 20 (s12). ). The ranging finder 30 detects the position of the reflecting prism 25 at regular intervals, and transmits the detected position to the information processing apparatus 20.

  The information processing apparatus 20 uses the wireless communication unit 24 to determine the position of the reflecting prism 25 detected by the ranging finder 30 (the position measured when the bottom surface of the weight 3 is placed on the top surface of the rubble foundation). Receive (s13). The information processing device 20 receives the height (current height) of the top end surface from the position of the reflecting prism 25 received in s13, the current height of the top end surface, and the difference (remaining) from the predetermined construction height. (Adjustment height) and the lifting height of the weight 3 are calculated and displayed on a display provided on the display / operation unit 22 (s14).

  The operator who operates the hoist 10 confirms the current height, the remaining adjustment height, and the lifting height displayed on the display of the information processing apparatus 20, lifts the weight 3, and puts it on the top end surface. It is dropped (s15). On the top end surface of the rubble foundation, the portion that is rolled by the bottom surface of the weight 3 is tamped.

  An operator who is operating the hoist 10 is lifting the weight 3 with reference to the remaining adjustment height and the lifting height displayed on the display of the information processing apparatus 20. The actual height at which the hoist 10 lifts the weight 3 is input from the hoist 10 to the information processing apparatus 20. Further, when the hoist 10 drops the lifted weight 3, the hoist 10 inputs the fact to the information processing device 20. Therefore, the information processing apparatus 20 can determine the timing at which the weight 3 lifted by the hoist 10 is dropped.

When the operator who is operating the hoist 10 by repeating s12 to s15 determines that the current height of the top end surface has reached the construction height, the leveling with respect to the leveling range is completed. In addition, if the operator who is operating the hoist 10 has an area that has not been leveled (unprocessed area) on the top face of the rubble foundation, the leveling range is within the unprocessed area. And the process shown in FIG. 6 is performed. The worker who is operating the hoist 10 determines that the leveling process of the top face of the rubble foundation has been completed when it is determined that there is no unprocessed area.

  Here, the calculation method of the lifting height of the weight 3 which the information processing apparatus 20 calculates in s14 is demonstrated.

  The information processing apparatus 20 calculates the amount of change in the height of the reflecting prism 25 before and after dropping the weight 3 (hereinafter referred to as the adjustment height this time). The adjustment height this time is a difference in height of the reflecting prism 25 before and after the weight 3 is dropped. Further, as described above, the height at which the weight 3 is actually lifted is input to the information processing apparatus 20 from the hoist 10 side.

  Further, the information processing device 20 determines the difference between the current height of the top surface of the rubble foundation and the height of the top surface of the submarine foundation to be constructed based on the height of the reflecting prism 25 after the weight 3 is dropped. The remaining adjustment height is calculated.

The information processing apparatus 20 uses the lifting height of the weight 3 as the current adjustment height A, the previous lifting height B of the weight 3, and the remaining adjustment height C.
Lifting height of weight 3 = (A × C) / B
Calculated by The last lifting height B of the weight 3 is proportional to the amount of energy given to the rubble foundation by the fall of the weight 3 (rolling the top end face of the rubble foundation). Further, the adjusted height A this time is a height at which the top end face of the rolled rubble foundation is lowered with respect to the amount of energy given by the fall of the weight 3. That is, A / B is the height at which the top end surface of the rolled rubble foundation is lowered with respect to the unit lifting height of the weight 3.

In addition, each time the rolling force due to the falling of the weight 3 is repeated, the top end surface of the rubble foundation is tamped, so the amount of depression (decrease amount) of the top end surface per unit energy applied to the top end surface is small. Become. Therefore, the proportional constant α (α> 1) may be used for calculating the lifting height of the weight 3. In particular,
Weight lifting height = α × (A × C) / B
You may calculate by calculation by. As described above, A is the adjustment height this time, B is the last lifting height of the weight 3, and C is the remaining adjustment height.

  In addition, α varies depending on the hardness of the stone material used to form the rubble foundation, the state of the seabed soil on which the rubble foundation is formed, etc. Therefore, the proportional constant α is not a fixed value, but an initial value (for example, α = 1.1) may be determined, and the current adjustment height A and the previous lifting height B of the weight 3 may be changed.

  Moreover, what is necessary is just to set the upper limit about the lifting height of the weight 3 to calculate. For example, the upper limit value may be set to 50 cm. Further, the lifting height when the weight 3 is dropped for the first time with respect to the determined range of the top end surface may be set to this upper limit value.

  As is clear from the above description, the lifting height of the weight 3 calculated by the information processing apparatus 20 is merely for the operator who is operating the hoist 10 to recognize the standard. The lifting height of the weight 3 by the hoist 10 is not limited.

  Thus, in this example, every time the operator drops the weight 3 onto the top end surface in the step of squeezing and leveling the top end surface, the current height of the top end surface and the remaining adjustment height are used to operate the hoist 10. It is possible to efficiently reduce the time required until the operator who performs the operation confirms. Thereby, the work time concerning the process of leveling the top end surface can be efficiently reduced, and the construction period of the submarine foundation can be shortened.

  Moreover, since the lifting height of the weight 3 is also displayed on the display unit of the information processing apparatus 20, the operator who is operating the hoist 10 recognizes a guideline for lifting the weight 3. Can be made.

  When the processing shown in FIG. 6 is completed for the entire top face of the rubble foundation, the unevenness is corrected with respect to the top face of the rubble foundation. Specifically, a diver who has submerged in the sea performs a visual check of the top end surface of the rubble foundation that has been solidified and leveled, and if there is any unevenness, notifies the operator (the operator of the crane). In accordance with an instruction from the diver, the crane operator drops the weight 3 and smoothes the unevenness of the top end surface with respect to the location where the unevenness occurs.

  Thereby, as shown in FIG. 7, the top end surface of the rubble foundation is tamped and leveled to a substantially uniform height. On the other hand, since the slope of the rubble foundation is not leveled at this time, a slope leveling process is performed in which the slope is solidified and leveled. This slope leveling step is performed by the method described in Patent Document 2 described above.

  In this slope leveling step, as shown in FIG. 8, the block-shaped pedestal 40 is placed on the top end surface of the rubble foundation. This pedestal 40 is placed in the vicinity of the boundary between the top face of the rubble foundation and the slope. The pedestal 40 has a hook that is rotatably provided on a side surface and is located on the slope side of the rubble foundation. The hook is rotatable in the vertical direction.

  Next, the plate-shaped leveling member 50 is connected to the pedestal 40 placed on the top end surface of the rubble foundation. Specifically, a ring provided on the side surface of the leveling member 50 is hooked on the hook of the base 40. Since the hook is rotatable, the hook is rotated by the weight of the connected leveling member 50, and the leveling member 50 is placed along the slope of the rubble foundation.

  Then, as shown in FIG. 8, the leveling member 50 is connected to the crane of the hoist 10 so that the leveling member 50 can be lifted.

  In the smoothing process of the slope of the rubble foundation, the leveling member 50 is lifted by the crane of the hoist 10 and the process of dropping the smoothing member 50 onto the slope is repeated, and the slope of the rubble foundation is fixed and leveled. Moreover, the leveling member 50 should just provide many holes. Since these holes function as drain holes, a decrease in the drop speed of the leveling member 50 in the sea can be suppressed. Therefore, the slope can be rolled with a sufficiently large force by the dropped leveling member 50. As a result, the slope can be sufficiently solidified and leveled.

  In addition, the area of the slope which is squeezed and smoothed by this process can be performed by shifting the mounting position of the pedestal 40 on the top end surface of the rubble foundation and the connecting position of the leveling member 50 with respect to the pedestal 40.

  By performing the process concerning s1 to s3 described above, it is possible to construct a seabed foundation that is solidified by solidifying the top end face and the slope (see FIG. 9). FIG. 9 shows a submarine foundation having a trapezoidal cross-sectional shape. The submarine foundation to be constructed is not limited to the shape shown in FIG. 9 and may have other shapes.

  Further, the hoist 10 may be configured to have an automatic operation function of lifting and dropping the weight 3 based on the lifting height of the weight 3 calculated by the information processing device 20. If it does in this way, in the leveling process of the top end surface of a rubble foundation, the work burden of the operator who operates the hoist 10 can be reduced further. In this case, the information processing device 20 may be configured to determine that the leveling with respect to the leveling range at that time is completed when the calculated residual adjustment height becomes 0 or less.

DESCRIPTION OF SYMBOLS 1 ... Hoist ship 2 ... Grab bucket 3 ... Weight 10 ... Hoist 11 ... Driving operation part 12 ... Input / output part 13 ... Operation control part 20 ... Information processing device 21 ... Control part 22 ... Operation part 23 ... Input / output part 24 ... Wireless communication unit 25 ... Reflecting prism 30 ... Ranging angle measuring instrument 31 ... Control unit 32 ... Ranging unit 33 ... Wireless communication unit

Claims (7)

Against riprap foundation formed by introducing rubble on the seabed,
Ranging angle measuring instrument installed on the ground with the height of the collimation mark attached to the weight in a state where the lower end of the weight attached to the hoist ship at sea is placed on the top end surface of the rubble foundation A first step of measuring the measured height and outputting the measured height wirelessly;
In the information processing device mounted on the hoist ship, the measurement height of the collimation landmark received wirelessly by the ranging finder is received, and the current height of the top surface of the rubble foundation at the present time, and A second step of calculating a residual adjustment height that is a difference between the current height and a predetermined construction height for the top end surface, and displaying the calculated current height and the residual adjustment height on a display;
The third step of lifting the weight with a hoist mounted on the hoist ship and dropping the lifted weight onto the top end surface is repeated, and the top end surface of the rubble foundation is squeezed at the construction height and leveled. A method for leveling the top surface ,
The second step includes a lifting height calculation step of calculating a lifting height for lifting the weight in the third step, and in addition to the current height and the remaining adjustment height, the lifting height The lifting height calculated in the height calculation process is also displayed on the display,
The lifting height calculation step includes:
The current adjustment height, which is the difference between the height of the collimation landmark measured last time in the first step and the height of the collimation landmark measured this time in the first step after execution of the third step,
The remaining adjustment height obtained from the height of the collimation landmark measured this time in the first step after the third step is performed;
The top surface leveling method of calculating the lifting height of the weight using the previous lifting height of the weight . The lifting height calculation step uses a proportional constant α (α> 1),
Lifting height of the weight
= Α × (the current adjustment height × the remaining adjustment height) / the previous lifting height of the weight
The top end surface leveling method according to claim 1, wherein the top end surface leveling method is calculated by an operation according to claim 1. In the third step, the hoist mounted on the hoist ship lifts the weight based on the lifting height of the weight calculated in the second step, and then drops the weight. The top end face leveling method according to claim 1 or 2 , wherein: A rubble foundation formation process that throws rubble into the seabed to form a rubble foundation;
A top surface leveling step of leveling the top surface of the rubble foundation formed in the rubble foundation formation step;
In the submarine foundation construction method of constructing a foundation for installing a structure to be laid on the sea, performing a slope leveling step of leveling the slope of the rubble foundation formed in the rubble foundation formation step,
The top end surface leveling step is
Ranging angle measuring instrument installed on the ground with the height of the collimation mark attached to the weight in a state where the lower end of the weight attached to the hoist ship at sea is placed on the top end surface of the rubble foundation A first step of measuring the measured height and outputting the measured height wirelessly;
In the information processing device mounted on the hoist ship, the measurement height of the collimation landmark received wirelessly by the ranging finder is received, and the current height of the top surface of the rubble foundation at the present time, and A second step of calculating a residual adjustment height that is a difference between the current height and a predetermined construction height for the top end surface, and displaying the calculated current height and the residual adjustment height on a display;
The third step of lifting the weight with a hoist mounted on the hoist ship and dropping the lifted weight onto the top end surface is repeated, and the top end surface of the rubble foundation is squeezed at the construction height and leveled. Process
The second step includes a lifting height calculation step of calculating a lifting height for lifting the weight in the third step, and in addition to the current height and the remaining adjustment height, the lifting height The lifting height calculated in the height calculation process is also displayed on the display,
The lifting height calculation step includes:
The current adjustment height, which is the difference between the height of the collimation landmark measured last time in the first step and the height of the collimation landmark measured this time in the first step after execution of the third step,
The remaining adjustment height obtained from the height of the collimation landmark measured this time in the first step after the third step is performed;
A submarine foundation construction method for calculating the lifting height of the weight using the previous lifting height of the weight . The lifting height calculation step uses a proportional constant α (α> 1),
Lifting height of the weight
= Α × (the current adjustment height × the remaining adjustment height) / the previous lifting height of the weight
The submarine foundation construction method according to claim 4, wherein the submarine foundation construction method is calculated by an operation according to claim 5. In the top face leveling system that smooths the top face of the rubble foundation formed by throwing rubble into the seabed,
Measure the height of the collimation mark attached to the weight, with the lower end of the weight installed on the hoist ship at sea placed on the top end surface of the rubble foundation. Ranging angle measuring instrument that outputs height wirelessly,
Mounted on the hoist ship, receiving the measured height of the collimation landmark output wirelessly by the ranging angle finder, the current height of the top face of the rubble foundation at the present time, and the top face An information processing device that calculates a remaining adjustment height that is a difference between the current height and a predetermined construction height, and displays the calculated current height and the remaining adjustment height on a display unit;
A hoist mounted on the hoist ship, lifting the weight, and dropping the lifted weight onto the top end surface ; and
The information processing apparatus has a lifting height calculation function for calculating a lifting height for lifting the weight by the hoist, and the lifting height calculation function in addition to the current height and the remaining adjustment height The lifting height calculated in step 1 is also displayed on the display.
The lifting height calculation function is
The height of the collimation landmark previously measured by the ranging finder and the height of the collimation landmark measured this time by the ranging finder after the hoist has dropped the weight onto the top end surface. This adjustment height, which is the difference between
After the hoist has dropped the weight on the top end surface, the remaining adjustment height obtained from the height of the collimating landmark measured this time with the distance measuring angulation, and
A top surface leveling system that calculates the lifting height of the weight using the lifting height of the weight last time . The lifting height calculation function uses a proportional constant α (α> 1),
Lifting height of the weight
= Α × (the current adjustment height × the remaining adjustment height) / the previous lifting height of the weight
The top end face leveling system according to claim 6, wherein the top end face leveling system is calculated by an operation according to claim 6.

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