TW201945245A - Underwater setting anchor strength test method and floating body - Google Patents

Abstract

The present invention can check the setting strength of an anchor installed in water with a simple configuration. From above a floating body 13 floating on the water surface 12, a force in the pull-up direction is applied to an anchor 11 so that the floating body 13 sinks into the water. The immersed volume of the floating body 13 corresponds to a value at which the anchor 11 is fixed when a necessary set strength of the upward pulling force applies to the anchor 11.

Description

   Method for testing strength of anchor installed underwater and floating body   

The invention relates to a method for testing the strength of an anchor installed underwater, which tests, for example, a solar power generation device floating on the water surface, or an anchor used to moor various moored bodies such as aquaculture cages, pontoons, and water skiing facilities. Whether it has the required tensile strength.

As a method of checking the installation state of the anchor, for example, the method disclosed in Patent Document 1 below can be cited.

This inspection method is to use a hollow hydraulic jack to pull up the rod part of the set anchor, and confirm that the load shown by the hydraulic gauge reaches the required pull-out strength value. The hydraulic jack is arranged on a pulling structure, and the pulling structure is arranged below the platform boat floating on the water surface and in contact with the water bottom.

However, in addition to the platform ship, a pull structure that is in contact with the bottom is also required. In this pull structure, a structure for setting a hollow hydraulic jack must also be provided. The size of the device for inspection is too large.

[Patent Literature]

Patent Document 1: Patent Publication No. 6252882

The main object of the present invention is to perform inspection with a simpler structure.

In order to achieve the purpose, a method for testing the strength of an anchor installed underwater is provided, which applies a pull-up force to the anchor installed in the water from the floating body floating on the water surface to sink the floating body into the water. ; The immersion volume of the floating body is a value corresponding to an upward pulling force of a necessary setting strength, while the anchor remains still.

The immersion volume of the buoyant body corresponding to a necessary upward tensile force is calculated based on the buoyancy acting on the buoyant body.

In this structure, the anchor is pulled from above the floating body, so that the part of the floating body above the water surface sinks into the water, and an upward pulling force corresponding to the necessary setting strength of the anchor is applied. If the installation state of the anchor can be maintained, Judging that the anchor has sufficient setting strength, if it cannot be maintained, it can be judged that the setting strength of the anchor is insufficient. When the setting strength of the anchor is insufficient, the anchor will be pulled up so that its appearance and movement can be clearly reflected on the floating body.

According to the present invention, the completed anchor is pulled from the floating body so that the floating body is immersed in a predetermined volume of water for inspection, and the operation is very simple. In addition, in order to achieve the above-mentioned device, at least a device for determining the submerged volume of the floating body and the floating body must be provided, that is, it can be constructed with very simple elements.

11‧‧‧ Anchor

12‧‧‧ water surface

13‧‧‧ floating body

15‧‧‧Construction Machinery

16‧‧‧Piling attachment

17‧‧‧Working platform ship

18‧‧‧ underwater

31‧‧‧Floating Board Department

32‧‧‧Protection board department

33‧‧‧ measuring instrument

34‧‧‧ scale plate

H‧‧‧immersion depth

Figure 1 is an explanatory diagram of the strength test method for an anchor installed underwater.

Figure 2 is a perspective view of the floating body.

FIG. 3 is an explanatory diagram for explaining immersion depth and immersion volume.

An explanatory diagram of a method of setting the anchor shown in FIG. 4.

An embodiment for implementing the present invention will be described using the following drawings.

Figure 1 is an explanatory diagram of the strength test method for an anchor installed underwater. That is, this test method is directed to the anchor 11 installed in the water by embedding or driving in, and a force in a pull-up direction is applied from the floating body 13 floating on the water surface 12, in other words, a vertical upward force is applied. To immerse the floating body 13 in the water. The amount of immersion at this time, in other words, the immersion volume, is an upward pull value corresponding to a necessary setting strength. And make sure that the anchor 11 remains still. If the anchor 11 still does not move, it means that the test result is acceptable. If the anchor 11 moves in the pulling direction, it means that the test result is unqualified.

In order to implement this method, the above-mentioned floating body 13 is necessary. The floating body 13 floats on the water surface. In other words, although the lower surface portion of the floating body 13 sinks under the water surface, the portion including the upper surface is floating on the water surface, even if a predetermined force is used to pull the anchor 11 from above. The force and buoyancy will also work to prevent the entire floating body 13 from sinking into the water.

FIG. 2 is a perspective view of an embodiment of the floating body 13. The floating body 13 is formed of a styrofoam and has a thick plate-like square shape in plan view. The floating body 13 is composed of a floating plate portion 31 and a protective plate portion 32, wherein the floating plate portion 31 is made of polystyrene foam; the rigid protective plate portion 32 is a metal plate laid on the floating plate portion 31. And so on. The floating plate portion 31 is a solid structure composed of a thick plate-shaped styrene foam plate.

The floating body 13 includes a measuring device 33 for indicating the immersion depth or immersion volume in water. The measuring instrument 33 is preferably capable of indicating the immersion depth with a simple structure.

The measuring instrument 33 shown in FIG. 2 includes a scale plate 34 in the vertical direction, in other words, a scale for indicating the length (height) of the floating body 13 in the thickness direction. The fixed position of the scale plate 34 can be appropriately set, and for example, it can be formed in four corner portions. Not only is it easy to see, but also the corner portion of the floating body 13 can be protected if the scale plate 34 is made of a hard material.

Here, the immersion volume of the floating body 13 to which an upward pulling force corresponding to a necessary setting strength is applied will be described using FIG. 3.

When the buoyancy acting on the buoyant body 13 is set to g [m / s ² ], the water density is set to ρ [kg / m ³ ], and it sinks beyond the portion of the buoyant body 13 that was originally submerged under the water surface 12 When the volume is set to V [m ³ ], the buoyancy acting on the floating body 13 is ρV g [N].

Gravity also acts on the floating body 13 with a mass of m [kg]. Because its size mg [N] is in equilibrium with buoyancy (ρV g = mg), the volume V of the part sunk below the water surface, that is, V = m / ρ, it is determined that the floating body 13 sinks into m / ρ [m ³ ] on the water surface.

Moreover, since the buoyancy is directly proportional to the immersion volume under the water surface, the immersion volume required to apply an upward pulling force corresponding to a necessary setting strength is V 1 [m ³ ], and the immersion volume and the size of the floating body 13 are thereafter For example, when an upward pulling force of 2 tons (t) is applied, the immersion depth H of the floating body 13 is 10 cm.

The floating body 13 needs a device for pulling the anchor 11 provided in the water. As the device for pulling the anchor 11, as shown by the dotted line in FIG. 1, a construction machine 15 such as a hydraulic excavator is used. The construction machine 15 is used by installing a piling attachment 16 at the front end of the forearm.

The construction machine 15 installed with the piling attachment 16 can also be used to drive or bury the anchor 11 as shown in FIG. 4. The floating body 13 described above is used as the work platform boat 17 for positioning the construction machine 15 on the water. In other words, the floating body 13 used for strength testing is also the work platform boat 17 used for setting the anchor 11.

In the installation strength test of the anchor 11 using the floating body 13 and the construction machine 15 described above, the anchor 11 is installed in a series of processes.

That is to say, the construction machine 15 is placed on the floating body 13 which can also be used as a work platform boat 17, and the floating body 13 is dragged to the anchor setting position on the water. Here, as shown in FIG. 4, the upper end of the anchor 11 is held on the construction machine 15, and the anchor 11 is driven into the bottom 18 to complete the setting of the anchor 11.

After that, the anchor 11 is pulled by the construction machine 15 while the upper end portion of the anchor 11 is held. In this way, because the anchor 11 is driven into the bottom 18, it is not easy to be pulled out. As shown by the solid line in FIG. 1, the portion of the floating body 13 floating above the water surface 12 is sunk below the water surface. .

In this immersion, although the immersion volume which is sunk by pulling is set to the value of the above-mentioned directional upward pull force, the immersion volume of the floating body 13 is determined by the measuring instrument 33 provided in the floating body 13.

Specifically, the scale plate 34 is used as the measuring instrument 33 to confirm the position of the water surface 12 before immersion. For example, an immersion depth of 2 t (tons) corresponding to the upward strength of the installation strength is assumed to be 10 cm. The position of the water surface 12 before immersion was immersed in the water 10 cm. Although the scale plate 34 can also be confirmed from the upper surface of the floating body 13, the installation of the anchor 11 also requires the diver to dive into the water, so it can be performed by the diver.

Since the scale plate 34 has scales for identifying the immersion depth, even when the floating body 13 is inclined when an upward pulling force is applied to the anchor 11, the scales of the scale plates 34 provided at the four corners can be known. The immersion depth of each part can easily calculate the predetermined immersion volume.

After the immersion depth reaches a predetermined depth, the state is maintained for a proper time. In other words, the floating body 13 is continuously immersed while maintaining a state where the predetermined immersion volume is reached. The duration depends on the use of the anchor 11 or the required setting strength, the underwater environment, etc., but it can be set appropriately without spending too much time. For example, it can be set from minutes to tens of minutes. It is preferably about 5 minutes.

The result of pulling the anchor 11 continuously. If the anchor 11 still does not move, it means that the test result is qualified. If the anchor 11 seems to be pulled up, it means that the test result is unqualified, and the anchor 11 needs to be reset immediately. Since the anchor 11 is pulled up when the setting strength of the anchor 11 is insufficient, not only can the divers working in the water confirm with the naked eye, but for the staff operating the construction machine 15, it is not through the digital numbers displayed on the machine, but You can easily confirm by feeling.

As described above, the operation is very simple by pulling the anchor 11 from above the floating body 13 and o so that the floating body 13 sinks into the water with a predetermined volume for inspection. Since the immersion volume of the floating body 13 is determined by the measuring instrument 33 included in the floating body 13, it is only necessary to pull the anchor 11 while confirming the measuring instrument 33, and it is easy to operate from this point.

In addition, the device used for this purpose only needs to have a floating body 13 provided with a measuring instrument 33. As described above, since the anchor 11 is pulled by the construction machine 15, a special device for pulling the anchor 11 may not be fixed. (Not shown). Therefore, the structure of the floating body 13 can be simplified, and the overall device required for testing can be further simplified.

In particular, the buoyant body 13 is also a working platform ship 17 used when the anchor 11 is installed, so that simplification and simplification can be further achieved.

In addition, since the test from the setting of the anchor 11 to the setting strength can be performed by a series of procedures, the operability is excellent, and the reliability of the setting strength can be improved compared to the case of checking again after a period of time after the setting.

The degree of reliability is not only to keep the floating body 13 in a state of sinking to a predetermined value of the immersion volume in the setting strength test, but also to improve the reliability by continuing in this state.

The above structure is used to implement a structure of an embodiment of the present invention, and the present invention is not limited to the above structure, and other structures may also be adopted.

In addition to the above-mentioned scale capable of identifying the immersion depth, the measuring instrument 33 can also be provided with a buoy floating on the water surface 12 and can recognize the actual immersion depth by feeling without the scale as a medium. Device, etc. or other construction. In addition, it is also possible to use a component to constitute the measuring instrument 33, and to indicate the portion submerged in water through a change in appearance.

Claims (7)

    A method for testing the strength of an anchor installed underwater is to apply a pull-up force to the anchor provided in the water from the floating body floating on the water surface to sink the floating body into the water; the floating body The immersion volume is a value corresponding to a necessary upward pulling force of the set strength, while the anchor remains still.         According to the method for testing the strength of an underwater anchor set as described in item 1 of the scope of the patent application, the floating body is continuously immersed while the immersion volume is at this value.         According to the method for testing the strength of an underwater anchor set as described in item 1 or 2 of the scope of the patent application, the immersion volume of the floating body is determined by a measuring instrument provided in the floating body.         According to the method for testing the strength of an anchor installed underwater as described in item 1 or 2 of the scope of the patent application, the floating body is used as a work platform boat used to set the anchor.         According to the method for testing the strength of an anchor installed underwater as described in item 3 of the scope of the patent application, the floating body is used as a work platform boat used to set the anchor.         A floating body floats on the water surface and is used to perform setting strength test on an anchor provided in the water. The floating body includes a measuring instrument for indicating the immersion depth or immersion volume in water.         The floating body described in item 6 of the scope of the patent application is formed by using polystyrene foam.