KR102536561B1 - Device and method for measuring shear strength and bearing capacity of seabed - Google Patents

Abstract

The present invention relates to an apparatus and method for measuring the shear strength and bearing capacity of a seabed ground, to which lifting wires installed to ascend and descend on a ship are connected, extending upward and downward from the upper portion and provided in parallel at predetermined intervals in the horizontal direction. A main body including a shear strength measuring means having a case made of leg parts, an automatic stop module and a cone module mounted on the case; Air-filled weight control chambers built into each leg, a load cell installed to measure the load change in the weight control chamber, an acceleration sensor built into the case, a scale marked in the height direction on the side of the leg, and a camera installed to take pictures of the scale By including a bearing capacity measuring means including a; and a control unit connected to control the main body, it is possible to measure the undrained shear strength and water content ratio, settlement amount and bearing capacity of the seabed ground.

Description

Device and method for measuring shear strength and bearing capacity of seabed soil {Device and method for measuring shear strength and bearing capacity of seabed}

The present invention relates to a device for measuring the soil condition of the seabed ground, and more particularly, to perform a pole cone drop test and a flat plate load test on the seabed ground, and based on these test data, the shear strength, water content and bearing capacity of the seabed ground It relates to a device and method for measuring the shear strength and bearing capacity of seabed ground, which are designed to measure

In general, offshore structures including piers, jackets, ship berths, offshore wind power generators, and the like may be installed on the seabed. The foundation of such an offshore structure can receive not only vertical load but also horizontal load due to tidal current, wave or wind load. Therefore, it may be very important to secure data on various characteristics including shear strength, water content, bearing capacity, etc. of the ground on the seabed to which offshore structures are fixed.

Therefore, in order to measure various characteristics of the seafloor ground, a measuring device having a simple structure, a small size, and a simple operation is required.

Republic of Korea Patent Registration No. 10-1660024 (2016.09, 27 announcement)

The object of the present invention, which was made to meet the above-mentioned needs, is a shear strength measuring means for measuring the shear strength of the seabed ground when a heavy cone falls, and a bearing capacity measurement for measuring the bearing capacity of the seabed ground by increasing the load on the bearing plate. An object of the present invention is to provide a device and method for measuring the shear strength and bearing capacity of seabed ground so that means are provided and an operation method of these means is provided.

In order to achieve the above object, the apparatus for measuring the shear strength and bearing capacity of the seafloor ground according to the present invention is, for example, connected to a lift wire installed to lift on a ship, and a plurality of legs formed in a form extending downward from the upper part and the upper part are horizontal. A main body including a case including a plurality of legs provided in parallel at predetermined intervals in a direction, and a shear strength measuring means having an automatic stop module and a cone module mounted on the case; and connected to control the main body. It may be made including; control unit.

Here, the automatic stop module may include a sliding member built into the case and reciprocating, and a gripping member mounted on a front end of the sliding member.

In addition, the cone module may include a cone installed to be gripped by the gripping member before and after free fall, and a cone mounted on the lower end of the cone.

Further, the control unit may be configured to reciprocate the sliding member so that the gripping member is in close contact with the cone so that the cone is fixed, and the gripping member is spaced apart from the cone so that the cone freely falls.

On the other hand, the measuring device according to the present invention includes a weight control chamber built into each leg and filled with air, a load cell installed to measure a load change in the weight control chamber, an acceleration sensor built into the case, and a height direction displayed on the side of the leg. A bearing force measuring means including a scale and a camera installed to photograph the scale; may be further included.

Here, the weight control chamber may include an inlet and a first opening/closing valve installed to allow water from outside the case to flow in, and an exhaust port and a second opening/closing valve installed to exhaust air inside the weight control chamber to the outside of the case.

And the control unit controls the opening and closing of the first opening and closing valve and the second opening and closing valve so that the inside of the weight control chamber is sealed or communicated with the outside, and receives and processes image data for the measured values of the load cell and the acceleration sensor and the scale of the camera. And, it can be made to measure and store the bearing capacity in contrast to these data.

Meanwhile, the main body may further include a water pressure sensor built into the case.

In addition, the descending length of the lifting wire, the water pressure data obtained from the water pressure sensor, and the image data of the camera obtained when the main body descends and reaches the seabed and the measured value of the load cell occurs at an inflection point in the linear are received by the control unit and image processing It can be made so that the position of the main body can be confirmed.

On the other hand, as another example, the device for measuring the shear strength and bearing capacity of the seafloor ground according to the present invention is connected to a lifting means installed on a ship with a lifting wire, and a plurality of legs formed in a form extending downward from the top and the top in a predetermined horizontal direction. A case including a plurality of legs provided in parallel at intervals, a main body including a bearing force measuring means having a weight control chamber mounted on each leg; and a control unit connected to control the main body; .

Here, the bearing force measurement means further includes a load cell built into the leg and installed to measure the load change of the weight control chamber, an acceleration sensor built into the case, a scale displayed in the height direction on the outer surface of the leg, and a camera installed to photograph the scale. It can be done by

In addition, the weight control chamber may further include an inlet and a first opening/closing valve to allow water from outside the case to flow in, and an exhaust port and a second opening/closing valve to exhaust air to the outside of the case.

In addition, when the legs of the case are seated on the seabed ground and the first on/off valve and the second on/off valve are opened by a control signal from the controller, air is exhausted from the weight control chamber and water is introduced to increase the load. The measurement value of the acceleration sensor for the subsidence of the leg part and the image data of the scale change for the subsidence obtained from the camera are transmitted to the control unit and processed, so that the bearing capacity can be measured through mutual correction.

On the other hand, a shear strength measuring device including an automatic stop module and a cone module mounted on the case; may be further included.

Here, the automatic stop module may include a sliding member built into the case and reciprocating, and a gripping member mounted on a front end of the sliding member.

In addition, the cone module may include a cone installed to be gripped by the gripping member before and after free fall, and a cone mounted on the lower end of the cone.

And the control unit is configured to reciprocate the sliding member so that the gripping member is in close contact with the cone so that the cone is fixed, and the gripping member is spaced apart from the cone so that the cone falls freely.

Meanwhile, the main body may further include a water pressure sensor built into the case.

In addition, the descending length of the lifting wire, the water pressure data obtained from the water pressure sensor, and the image data of the camera obtained when the main body descends and reaches the seabed and the measured value of the load cell occurs at an inflection point in the linear are received by the control unit and image processing It can be made so that the position of the main body can be confirmed.

On the other hand, the method of measuring the shear strength and bearing capacity of the seabed ground by operating the above-described measuring device includes a tenth step (S10) of lowering the body to the seabed and placing it on the seabed ground; A 20th step (S20) of performing a pole cone drop test; and a 30th step (S30) of performing a subsea plate load test.

Here, in step 10 (S10), the main body is lowered to the sea floor by unwinding or unwinding the lifting wire installed on the ship, and when the inflection point of the load cell measurement occurs when it reaches the sea floor, the image data of the camera acquired around this point , Water pressure data measured by the water pressure sensor, the descending length of the hoisting wire, etc. are measured to measure the position of the main body so that the main body can be seated at a set position on the seabed.

In addition, in the twentieth step (S20), when the sliding member and the gripping member are spread apart by the control signal of the controller and the gripping state of the cone bar is released, the cone freely falls and penetrates the seabed at a predetermined depth, and after a predetermined time elapses, the control unit controls the cone. When the sliding member and the gripping member are returned by the signal and the cone is in a gripping state again, the position of the penetrating cone may be fixed.

And in the 30th step (S30), when the first on-off valve and the second on-off valve are opened by the control signal from the control unit, air is exhausted from the weight control chamber and water is introduced to increase the load, thereby increasing the load and the subsidence of the leg. The measured value of the ripeness sensor and the image data for the scale change for the settlement obtained from the camera may be transmitted to the control unit to measure the bearing capacity by mutual correction.

As described above, according to the present invention, the shear strength measuring means for performing the pole cone free fall test is included in the main body fixed to the seabed ground, so that the undrained shear strength of the seabed ground through the pole cone free fall test can be measured. There are possible effects.

In addition, with one operation of the shear strength measuring means, there is an effect of simply measuring the shear strength of the seabed ground as well as the water content in the field.

In addition, the size and weight of the device is minimized, so that it can be moved, installed, and operated by one worker.

In addition, since the main body fixed to the seabed includes a bearing capacity measuring means for performing a flat plate load test, there is an effect of measuring the settlement and bearing capacity of the seabed ground through the load test on the seabed.

In addition, there is an effect that a worker can digitally observe in real time on a ship by a camera and a plurality of sensors installed in the main body.

In addition, the conditions of the ground, including the type of ground, the speed of the current near the ground, and water pressure, are obtained in advance, and the weight of the cone is adjusted based on this, and then the measurement is performed, so that measurements can be made in a wide range regardless of the ground conditions. There are possible effects.

The following drawings attached to this specification illustrate preferred embodiments of the present invention, and together with the detailed description of the present invention serve to further understand the technical idea of the present invention, the present invention is limited only to those described in the drawings. and should not be interpreted.
1 is a side cross-sectional view schematically illustrating an apparatus for measuring shear strength and bearing capacity of seabed ground according to a preferred embodiment of the present invention.
2 and 3 are plan and bottom views schematically illustrating the apparatus of FIG. 1 .
FIG. 4 is a configuration diagram illustrating a control relationship between a controller and components shown in FIG. 1 .
FIG. 5 is a flow chart for measuring the shear strength and bearing capacity of seabed ground using the apparatus shown in FIG. 1 .
FIG. 6 is a diagram illustrating a process of conducting a test for measuring electric shock using the main body of FIG. 1 .
7 is a graph showing the shear strength of each soil of the seabed ground obtained by the fall cone drop test shown in FIG. 6a.
8 is a graph showing the change in shear strength according to the change in the water content of FIG.
9a to 9c are graphs showing the relationship between weight increase, bearing capacity and settlement amount that change as a result of weight increase during the bearing capacity measurement test in FIG. 5 .
Figure 10 is a graph showing the change of the load cell that occurs while arriving at the ground when the main body is lowered in Figure 9a.

Hereinafter, preferred embodiments will be described in detail so that those skilled in the art can easily practice the present invention with reference to the accompanying drawings. Also, among components mentioned in various embodiments, similar components and related components in each embodiment may be replaced, replaced, or added. However, in the detailed description of the operating principle of the preferred embodiment of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

<Configuration>

As shown in FIGS. 1 to 4 , the device for measuring the shear strength and bearing capacity of seafloor ground according to a preferred embodiment of the present invention includes a main body 100 descending from a ship to the seabed and a control unit 200 installed on the ship. Hereinafter, 'shear strength' shall be referred to as 'undrained shear strength'.

First, the body 100 may include a case 110, a shear strength measuring means 120 and a bearing force measuring means 130.

The case 110 is provided in parallel with an upper portion 111 having a circular or polygonal shape including a triangle and a quadrangle in plan and having an internal space, and extending downward from the upper portion 111 at predetermined intervals in the horizontal direction. It may include a plurality of leg parts 112 to be. At this time, as shown in FIG. 1, the upper part 111 and the leg part 112 may be manufactured to have a closed space while communicating with each other.

In addition, a lifting wire 113 may be fixed to the upper surface of the case 110 to lower or raise the case 110 to the sea floor. For example, the case 110 may be lowered or raised to the sea floor while the lifting wire 113 is wound or unwound by a lifting means (not shown) installed on the ship. In addition, a water pressure sensor 114 may be installed in the case 110 . The water pressure sensor 114 allows the main body 100 to descend and settle on the sea floor, and the position of the main body 100 can be confirmed.

The shear strength measuring means 120 may include a configuration for performing a fall cone drop test on the seabed. In detail, the shear strength measuring unit 120 may include a cone module 121 located at the center of the planar case 110 and an automatic stop module 125 holding the cone module 121.

Here, the corn module 121 may include a corn bar 122 penetrating the upper center of the planar case 110 and a cone 123 mounted on the lower portion of the corn bar 122. In addition, one or more donut-shaped first weights 124 placed on the upper surface of the cone 123 while penetrating the cone 122 to increase the weight of the cone 123 according to the depth or environment of the seabed are further included. can do.

In addition, the angle of the cone 123 is 25 to 35°, preferably 30°, to minimize disturbance and heaving of the seabed ground when the cone penetrates and minimizes the influence of the speed and direction of the seabed water flow. there is. In addition, it may be used with a cone angle of about 45° or 60°, which is generally used on flat ground. At this time, it may be necessary to adjust the correction factor of (Equation 1) described later to obtain the shear strength according to the cone angle.

In addition, the height of the cone 123 may be preferably up to 4 cm in consideration of the condition that the penetration depth of the cone may be deeper than that of the flat land because the seafloor ground is generally looser than the land ground. For example, when the cone 123 is penetrated to a depth of 4 cm or more during the pole cone test, the undrained shear strength may be classified as extremely loose ground with an undrained shear strength of 0.5 kPa or less.

In addition, the weight of the cone 123 was obtained in advance from various conditions, including the depth of the seabed, the degree of compaction of the ground, the speed and direction of the water flow, etc. One or more first weights 124 may be installed and adjusted. The weight of the first weight 124 is preferably half of the weight of the cone 123, about 40 g, and may be manufactured in various weights including 10 g and 20 g.

And, as shown in FIG. 1 , the automatic stop module 125 may be installed in the upper center of the case 110 to grip the conveyor 122 located through the upper center of the case 110. The automatic stop module 125 receives an electrical signal from the controller 210 and is mounted on the sliding member 126 installed to reciprocate horizontally and the front end of the sliding member 126 to hold in close contact with the conveyor 122. It may include a holding member 127 for fixing. At this time, as the gripping member 127, a member having high adhesion, gripping force, and friction coefficient with the conveyor 122 is used, and may be, for example, rubber.

In addition, when the initial position of the lower end of the cone 123 and the lower end of the leg part 112 is changed after the main body 100 is seated on the seabed, the automatic stop module 125 is changed. It may further include a gear unit installed to rotate the holding member 127 to raise or lower the in units of mm.

Therefore, while the body 100 is descending, the sliding member 126 is retracted from both sides by a signal from the control unit 200, and the gripping member 127 grips the cone 122 so that the cone 123 is fixed. can Thereafter, when the main body 100 is seated on the seabed ground and the sliding member 126 and the gripping member 127 spread sideways by the signal of the control unit 200 during the fall cone drop test, the grip of the conveyor 122 is released. The cone 123 may fall freely and penetrate the seafloor to a certain depth. After the cone 123 falls freely and after a certain period of time has elapsed, the sliding member 126 is retracted by a signal from the control unit 200 so that the gripping member 127 comes into close contact with the cone 122 and the cone 123 The height of the intruded state can be fixed as it is. Then, after the main body 100 is boarded on a ship, the degree of penetration depth may be measured.

The bearing capacity measuring means 130 may be configured to perform a flat plate load test on the seabed ground. In detail, the support force measurement means 130 may include a weight control chamber 131, a load cell 137, a scale 138, a camera 139, and an acceleration sensor 140.

Here, as shown in FIGS. 1 to 3 , the weight adjustment chamber 131 may be built into each of the leg parts 112 of the case 110 and detachably mounted with a fixed clasp 137 . In addition, the weight control chamber 131 has an inlet 132 and a first opening/closing valve 133 so that water flows into an empty interior space filled with air, and an exhaust port 134 and a second opening/closing valve so that air in the empty interior space is exhausted. A valve 135 may be installed.

At this time, the first on-off valve 133 and the second on-off valve 135 simultaneously open and close the inlet 132 and the exhaust port 134 by a control signal from the control unit 200, or may be installed to open and close first. In addition, the first on-off valve 133 may be installed on the side of the weight control chamber 131, and the second on-off valve 135 may be installed on the upper surface of the weight control chamber 131. In addition, the inlet 132 and the exhaust port 134 connect the weight control chamber 131 and the outside of the case 110 so that air is exhausted or water is introduced.

Therefore, while the body 100 descends to the sea floor, it is filled with air, and when the first on-off valve 133 and the second on-off valve 135 are operated by the controller 200 during the bearing capacity test, the inlet 132 And the exhaust port 134 is opened so that water is introduced and air is exhausted, thereby increasing the load. Thereafter, when the weight control chamber 131 is filled with water, the inlet 132 and the exhaust port may remain open or may be closed.

In addition, the load cell 137 may be disposed between the lower surface of the weight control chamber 131 and the lower surface of the leg, and may be installed to measure the continuously rising load of the weight control chamber 131. The load cell 137 is set based on a state in which air is filled in the weight control chamber 131 after the main body 100 is seated on the seabed, and then the bearing capacity while the load of the weight control chamber 131 increases. can be set up to measure Of course, the standard setting of the load cell 137 is performed under the control of the control unit 200, and data measured by the load cell 137 may be received by the control unit 200 and stored.

In addition, the scale 138 is for measuring the amount of subsidence of the main body 100, and may be marked on the leg portion 112 of the case 110. The scale 138 may be displayed in units of mm and cm in the height direction from the lower end of the leg portion 112 .

In addition, the camera 139 may be mounted on the leg portion 112 of the case 110 and may be installed to photograph the graduations 138 displayed on the leg portion 112 . At this time, the camera 139 may be installed to photograph the scale 138 on the opposite side. Also, the camera 139 may be installed to provide an image of the scale 138 to the controller 200 . Therefore, the camera 139 acquires as image data the change of the scale 138 that occurs while the leg portion 112 sinks into the seabed due to the increase in the load of the weight control chamber 131, and the image data is obtained by the control unit. It can be seen on the monitor 220 of (200).

The camera 139 additionally maintains the image data of the area where the main body 100 is placed on the seabed ground and the initial position installed so that the lower end of the cone 123 is located on the same line as the lower end of the leg part 112, It may be installed to transmit image data that can be checked to the control unit 200. As shown in FIG. 10 , the image data at this time may be an image near a time point at which an inflection point occurs in the measured value of the load cell 137 .

In addition, the camera 139 may be installed to acquire the position of the cone 123 before the fall and the intruded state after the fall as image data.

In addition, the acceleration sensor 140 may be built in the water pressure sensor 114 built in the upper part 111 of the case 110. The acceleration sensor 140 may be installed to obtain data on the amount of sinking of the leg 112 of the case 110 and transmit the data to the control unit 200 . Therefore, a more accurate measurement value for the settlement can be calculated by mutually correcting the settlement amount data obtained from the acceleration sensor 140 and the image data obtained from the camera 139 in the control unit 200 .

In addition, when the case 110 is not fixed because the weight of the uncontrolled adjustment chamber 131 is lighter than the water depth or the speed of the water flow, a second weight 141 may be additionally mounted on the upper surface of the case 110. The second weight 141 has a donut shape with a hole in the center, and a fitting protrusion (not shown) may be installed on the upper surface of the case 110 so that the second weight 141 is inserted. At this time, the fitting protrusion and the second weight 141 may be installed so as not to interfere with the moving conveyor 122 . Due to this, the case 110 is lowered in a state of being fitted to the upper surface of the case 110 by the second weight 141, and the state fixed to the seabed can be firmly maintained. In addition, fitting protrusions are installed at various places on the plane of the upper surface of the case 110, and the second weights 141 are fitted and fixed to each of the fitting protrusions, and at this time, the center of the case 110 may be fixed to be maintained.

On the other hand, as shown in FIG. 4, the controller 200 is installed on a ship that lowers the main body 100 to the sea floor, and the controller 210 installed to control each component installed in the main body 100 and various data are displayed on the screen. It may include an output monitor 220 and a recording means 230 for storing these data.

Here, the controller 210 receives and determines the data measured by the water pressure sensor 114 built in the body 100, and the sliding member 126 for free falling the cone 123 in the automatic stop module 125 Controls the reciprocating movement of the , controls the opening and closing of the first on-off valve 133 and the second on-off valve 135, receives and determines the measurement data of the load cell 137, and measures the data from the acceleration sensor 140 It may be installed to receive and determine, receive and determine an image acquired by the camera 139, and compare and analyze measurement data of the acceleration sensor 140 and image data of the camera 139.

In addition, the monitor 220 and the recording means 230 image-process and record various data and the comparison results of these data, including whether the shear strength measuring means 120 and the bearing capacity measuring means 130 are operating normally. It can be set up to image process and record all processes.

In addition, the measuring device according to a preferred embodiment of the present invention may further include an elevating means for lowering and raising the main body 100 to and from the sea floor. This lifting unit may be controlled by an operator through a separately provided control panel or by the controller 210 described above.

<Method>

Hereinafter, a method for measuring the shear strength and bearing capacity of the seabed ground using the measuring device according to the above-described preferred embodiment of the present invention will be described with reference to FIGS. 5 to 10.

First, as shown in FIG. 5, the main body 100 is lowered to the sea floor and secured thereto (S10). The main body 100 may be lowered to the seabed by an elevating means (not shown) installed on the ship, and may be seated on the seabed ground. To this end, the depth of the seabed, the direction and speed of the water flow for seating the main body 100. It is possible to obtain basic data in advance, including the type of soil at the landing site, constituent minerals, and grain size. The prior data obtained at this time can be used as data for measuring and estimating the undrained shear strength and water content according to the penetration depth of the cone 123 in the pole cone test. In addition, the height of the cone 123 is set to be positioned on the same line as the lower end of the leg portion 112 of the case 110, and the weight adjustment chamber 131 can be filled with air.

In addition, when the main body 100 descends and reaches, the position of the main body can be checked through the descending length of the lifting wire 113 and water pressure data obtained from the water pressure sensor 114. In addition, as shown in FIG. 10 while the main body 100 descends from the sea floor, the measured value of the load cell 137 linearly increases due to the water pressure, and when it reaches the sea floor, an inflection point is generated, near the point at which the inflection point occurs. The location of the main body 100 can be additionally confirmed through the image data of the \camera 139 acquired in . Through this confirmation, it can be confirmed whether the main body 100 is properly seated in the set position. Of course, when out of the set position, the main body 100 may be raised and lowered again to move to the set position.

Next, a fall cone drop test is performed (S20). As shown in FIG. 6 , when the main body 100 is seated on the seabed, the state in which it is seated is confirmed by the camera 139, and a fall cone drop test may be performed. To this end, the state in which the sliding member 126 and the gripping member 127 of the automatic stop module 125 hold the cone 122 is released, and the cone 123 freely falls toward the seabed. can Due to this free fall, the cone 123 penetrates the seafloor to a certain depth, and at this time, the sliding member 126 and the gripping member 127 hold the cone 122 in a state in which the cone 123 penetrates. By returning to the cone 123 can be fixed.

Next, a subsea plate load test is performed (S30). When the fall cone drop test is completed, as shown in FIG. 9A , the first on/off valve 133 and the second on/off valve 135 may be opened and the weight control chamber 131 may be filled with water. As a result, the load of the main body 100 increases, and the lower end of the leg portion 112 may sink to the seabed. At this time, the control unit 200 may obtain, record, and store the measured value of the acceleration sensor 140 for the changing load and image data of the change of the scale 138 for the settlement obtained through the camera 139.

The aforementioned pole cone drop test process (S10) and the submarine plate load test process (S20) may be performed in reverse order.

Finally, after the main body 100 is lifted from the sea floor and moved to a ship, result data is generated based on the data obtained in the pole cone drop test and the sea bed plate load test (S40).

In the pole cone drop test, the penetration depth of the fixed cone 123 may be measured in a penetration state.

In addition, the Atterberg Limit can be determined by measuring the penetration depth of the cone 123 freely dropped into the saturated fine-grained soil through the fall cone drop test and the undrained shear strength through (Equation 1) below.

ㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡ(식1)

ㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡㅡ (Formula 1)

where Su is the undrained shear strength, K is the correction factor of the cone (=0.85, Wroth and Wood 1978), W is the weight of the cone, and d is the penetration depth of the cone.

In addition, the correction coefficient of the cone 123 is a coefficient for correcting the excessive analysis of the shear strength due to the surface roughness of the cone 123 and the frictional relationship between the fine-grained soil particles and the heaving phenomenon of the ground surface due to the cone penetration. In addition, the penetration length of the cone 123 may be measured with a vernier caliper, for example.

Through this process, pole cone drop tests were conducted for various soils, and in FIG. 7, various undrained shear strengths measured through the difference in cone penetration depth for each soil are shown, and in FIG. 8, diatom (DE), silt ( The change in water content according to the change in undrained shear strength according to various soils such as SF), kaolin (KN), and illite (IL) is shown.

In addition, as shown in FIGS. 9b and 9c through the subsea plate load test, data on changes in settlement and bearing capacity can be obtained. And, referring to FIG. 10 , it is possible to measure whether the body 100 is loose ground or dense ground according to the load change after the inflection point at which the main body 100 is seated on the seafloor ground and the water depth change.

As described above, those skilled in the art to which the present invention pertains will be able to understand that the present invention can be embodied in other specific forms without changing its technical spirit or essential features. Therefore, the above-described embodiments should be understood as illustrative in all respects and not limiting. The scope of the present invention is indicated by the patent claims to be described later rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be construed as being included in the scope of the present invention. do.

100: body
110: case 111: upper part
112: leg part 113: lifting wire
114: water pressure sensor.
120: shear strength measuring means
121: con module 122: con bar
123 cone 124 first weight
125: automatic stop module 126: sliding member
127: holding member.
130: bearing capacity measuring means
131: weight adjustment chamber 132: inlet
133: first on-off valve 134: exhaust port
135: second on-off valve 136: fixed latch
137: load cell 138: scale
139: camera 140: acceleration sensor
141: second weight.
200: control unit
210: controller 220: monitor
230: Recording means.

Claims (10)

An elevating wire 113 installed to ascend and descend in a ship is connected, and an upper portion 111 and a plurality of leg portions 112 formed in a form extending downward from the upper portion 111 are arranged in parallel at predetermined intervals in the horizontal direction. A case 110 including a plurality of legs 112 provided, and a shear strength measuring means 120 having an automatic stop module 125 and a cone module 121 mounted on the case 110 body 100; and
A control unit 200 connected to control the main body 100; includes,
The automatic stop module 125 includes a sliding member 126 built into the case 110 and reciprocating, and a holding member 127 mounted on the front end of the sliding member 126,
The cone module 121 includes a cone 122 installed to be gripped by a gripping member 127 before and after free fall, and a cone 123 mounted on the lower end of the cone 122,
The controller 200 is a sliding member so that the gripping member 127 adheres to the cone 122 so that the cone 123 is fixed and the gripping member 127 is spaced apart from the cone 122 so that the cone 123 freely falls. A device for measuring the shear strength and bearing capacity of the seabed ground made to reciprocate (126).
In claim 1,
A weight control chamber 131 built into the leg part 112 and filled with air, a load cell 137 installed to measure a load change in the weight control chamber 131, and an acceleration sensor 140 built into the case 110 ), a scale 138 displayed in the height direction on the side of the leg part 112, and a bearing force measuring means 130 including a camera 139 installed to photograph the scale; further comprising,
The weight control chamber 131 has an inlet 132 and a first opening/closing valve 133 installed so that water outside the case 110 flows in, and the air inside the weight control chamber 131 is exhausted to the outside of the case 110. Including an exhaust port 134 and a second on-off valve 135 installed as much as possible,
The control unit 200 controls the opening and closing of the first on-off valve 133 and the second on-off valve 135 so that the inside of the weight control chamber 131 is sealed or communicated with the outside, and the load cell 137 and the acceleration sensor ( 140) and the image data for the scale 138 of the camera 139 are received and image processed, and the shear strength and bearing capacity of the seabed ground is configured to measure and store the bearing capacity in comparison with these data.
In claim 2,
A water pressure sensor 114 built into the case 110, a first weight 124 to increase the weight of the cone 123, and a second weight 141 to increase the weight of the weight control chamber 131 further comprising at least one of
Obtained when the descending length of the lifting wire 113, the water pressure data obtained from the water pressure sensor 114, and the measured value of the load cell 137 occur at an inflection point in the linearity after the body 100 descends and reaches the seabed ground An apparatus for measuring the shear strength and bearing capacity of the seabed ground so that the image data of the camera 139 is received and image processed by the control unit 200 to confirm the position of the body 100.
Connected to the lifting means installed on the ship by the lifting wire 113, the upper part 111 and a plurality of leg parts 112 formed in a form extending downward from the upper part 111 are parallel at predetermined intervals in the horizontal direction A body 100 including a case 110 including a plurality of leg parts 112 provided with a support force measuring means 130 having a weight adjustment chamber 131 mounted on each leg part 112; and
A control unit 200 connected to control the main body 100; includes,
The support force measurement means 130 includes a load cell 137 installed in the leg part 112 and installed to measure a load change of the weight control chamber 131, an acceleration sensor 140 built in the case 110, and a leg part ( 112) further comprising a scale 138 displayed in the height direction on the outer surface and a camera 139 installed to photograph the scale 138,
The weight control chamber 131 includes an inlet 132 and a first opening/closing valve 133 to allow water from outside the case 110 to flow in, and an exhaust port 134 and a second outlet to exhaust air to the outside of the case 110. Further comprising an on-off valve 135,
When the leg part 112 of the case 110 is seated on the seabed and the first opening/closing valve 133 and the second opening/closing valve 135 are opened by a control signal from the controller 200, the weight control chamber 131 ), the air is exhausted and water is introduced to increase the load, and the measurement value of the acceleration sensor 140 for the increase in load and the sinking of the leg 112 and the scale for the sinking obtained from the camera 139 ( 138) An apparatus for measuring shear strength and bearing capacity of a seabed ground configured to measure bearing capacity by mutual correction while the image data of change is transmitted to the control unit 200 and image processed.
In claim 4,
A shear strength measuring means 120 including an automatic stop module 125 and a cone module 121 mounted on the case 110; further comprising,
The automatic stop module 125 includes a sliding member 126 built into the case 110 and reciprocating, and a holding member 127 mounted on the front end of the sliding member 126,
The cone module 121 includes a cone 122 installed to be gripped by a gripping member 127 before and after free fall, and a cone 123 mounted on the lower end of the cone 122,
The control unit 200 is a sliding member so that the gripping member 127 is in close contact with the cone 122 so that the cone 123 is fixed and the gripping member 127 is spaced apart from the cone 123 so that the cone 123 freely falls. A device for measuring the shear strength and bearing capacity of the seabed ground made to reciprocate (126).
In claim 4,
The main body 100 is configured to increase the weight of the water pressure sensor 114 built in the case 110, the first weight 124 to increase the weight of the cone 123, and the weight control chamber 131 At least one of the two weights 141 is further included,
Obtained when the descending length of the lifting wire 113, the water pressure data obtained from the water pressure sensor 114, and the measured value of the load cell 137 occur at an inflection point in the linearity after the body 100 descends and reaches the seabed ground An apparatus for measuring the shear strength and bearing capacity of the seabed ground so that the image data of the camera 139 is received and image processed by the control unit 200 to confirm the position of the body 100.
In the method for measuring the shear strength and bearing capacity of the seabed ground with the device of any one of claims 1 to 6,
A tenth step (S10) of lowering the body 100 to the seabed and settling it on the seabed ground;
A 20th step (S20) of performing a fall cone drop test;
A method for measuring the shear strength and bearing capacity of the seabed ground, characterized in that it comprises a; 30th step (S30) of performing a subsea plate load test.
In claim 7,
In the tenth step (S10), the main body 100 is lowered to the sea floor by unwinding the lifting wire 113 installed to be wound or unwound on the ship, and when the inflection point of the measured value of the load cell 137 occurs after reaching the sea floor, this time point The body 100 is moved to the seabed by measuring the position of the body 100 by comparing the image data of the camera 139 obtained from the vicinity, the water pressure data measured by the water pressure sensor 114, and the descending length of the lifting wire 113. A method for measuring the shear strength and bearing capacity of the seabed ground, characterized in that it is seated at the set position of the ground.
In claim 7,
In the twentieth step (S20), when the sliding member 126 and the gripping member 127 are spread apart by the control signal of the control unit 200 and the gripping state of the conveyor 122 is released, the cone 123 freely falls to the seabed. is penetrated to a certain depth, and after a certain time elapses, the sliding member 126 and the gripping member 127 are returned by the control signal of the control unit 200 and the cone 122 is in a gripping state again, the penetrating cone 123 Method for measuring shear strength and bearing capacity of seabed ground, characterized in that for fixing the position of.
In claim 7,
In the 30th step (S30), when the first on-off valve 133 and the second on-off valve 135 are opened by the control signal of the control unit 200, air is exhausted from the weight control chamber 131 and water is introduced. When the load increases, the measured value of the maturity sensor for the load increase and the subsidence of the leg 112 and the image data for the change of the scale 138 for the subsidence obtained from the camera 139 are transmitted to the controller 200 A method for measuring the shear strength and bearing capacity of the seabed ground, characterized in that the bearing capacity is measured by mutual correction.

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