JPH07238549A - Device and method of measuring thickness of placing sand layer on bottom of water - Google Patents

Abstract

PURPOSE:To make it possible to accurately measure the thickness of a placing sand layer irrespective of the settlement of the undersea ground or the sticking of disperse sand into the ground. CONSTITUTION:A sand layer surface contact plate 5 is mounted to the lower end of a straight guide 2 formed in a cylindrical shape, and a bar-shaped penetration rod 1 is inserted in the straight guide 2. The plate 5 is brought into contact with the surface of a placing sand layer 8, force-fit of the penetration rod 1 is made to pass through the placing sand layer 8, and the thickness of the sand layer is measured with the penetration length at that time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to an apparatus and method for measuring the thickness of a bed layer deposited on a water bottom by sand removal.

[0002]

2. Description of the Related Art Conventionally, there is a method of laying a sand layer on the water bottom surface by removing sand for embedding water bottom sediments, compacting soft ground, and the like. In this method, there is a water carrying sand method in which sand is carried using running water and is removed to the bottom of the water. In this method, rods are hung from a work boat, or staff are stood to remove the sand while measuring the water depth on the surface of the bed, and the top height of the bed is adjusted. In addition, the thickness of the bed layer was managed by measuring the water depth by red surveying and staff before and after sand sprinkling and taking the difference between the measured values.

[0003]

As described above, in the conventional method for controlling the thickness of the bed layer, since the ground to which the bed sand is applied is often soft ground, the sand is sunk into the ground or the sand Since the ground subsides due to the weight, the bottom of the sand layer is often lower than the ground surface height measured before the sand is sprinkled, which makes the sand layer thickness larger than the planned thickness.
There was a problem that the amount of sand was larger than planned.

In view of the above conventional problems, the present invention provides a water bottom laying sand layer thickness measuring device and its measurement capable of accurately measuring the thickness of the laying sand layer in order to accurately control the sand layer thickness during sanding. It is intended to provide a method.

[0005]

The features of the present invention for solving the above-mentioned conventional problems and achieving the intended purpose are as follows.
It is provided with a penetrating rod having a tip fitted into the bed layer, a straight guide for guiding the penetrating rod, and a sand layer surface abutting plate fixed to the tip of the guide and abutting against the bed layer surface. Water-bottomed sand layer thickness measuring device (Claim 1) and a penetrating rod that uses the device to insert the tip into the bed layer, a straight guide that guides the penetrating rod, and a tip fixed to the guide. , Using a water layer laid sand layer thickness measuring device comprising a sand layer surface abutting plate to be brought into contact with the laid sand layer surface, with the sand layer surface abutting plate abutting the laid sand layer surface of the water bottom, the penetration The rod is pressed from the surface of the bed, and the penetration of the bed is detected by the change in the press-fit resistance after the start of press fitting.By measuring the relative position of the rod and the guide at that time, the rod penetration length when the bed is penetrated Measure In the bottom of the water laid sand layer thickness measurement method (claim 2).

[0006]

According to the apparatus and method of the present invention, the straight guide is vertically lowered from the ship, and the plate at the lower end is brought into contact with the surface of the laid sand layer. Then, the penetrating rod is pushed down along the straight guide so that the lower end of the rod penetrates into the bed sand layer. The height of the rod tip at the start of penetration can be known by setting the relative relationship between the straight guide and the penetration rod in advance. When the rod penetrates in this way and the lower end reaches the bottom of the sand layer, it is possible to know that the tip of the rod passes the bottom of the sand layer because the sand layer and the ground beneath it have different penetration resistance. By measuring the relative height of the rod tip to the straight guide at that time, the distance between the plate on the sand laying layer surface and the rod tip, that is, the laying sand layer thickness can be known.

When a surface covering material such as a net or a sheet is laid on the bottom of the water prior to sand sprinkling, the bottom surface height of the bed sand layer can be known by hitting the tip of the penetrating rod against it. You can

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.

1 and 2 show an example of a device according to the present invention, in which 1 is a penetrating rod and 2 is a straight guide. The penetrating rod 1 has a weight-shaped tip penetrating metal fitting 3 fixed to the tip of a main body made of a steel rod, and a T-shaped arrangement handle 4 for penetrating operation fixed to the upper end. The guide 2 is configured by a cylindrical tube, and a sand layer surface contact plate 5 made of a circular iron plate is fixed to the outer periphery of the lower end of the guide 2, and a number of vertically long windows 6 are formed in the longitudinal direction.

The penetrating rod 1 described above is inserted into the guide 2. The cylindrical pipe that constitutes the guide 2 is formed to have a length that allows the upper end to be operated on the work boat with the lower end in contact with the water bottom, depending on the depth of water used, and the penetrating rod 1 is formed from the guide 2 to the sand layer. It is formed as long as the length required for penetration.

When using the apparatus constructed as described above, as shown in FIG. 3, the guide 2 is placed from above the work boat 9 on the surface of the spread sand layer 8 immediately after the sand sprinkling head 7 has passed and sanded. The plate 5 at the lower end is hung vertically, and the plate 5 at the lower end is brought into contact with the surface of the sand laying layer 8. In this state, the penetrating rod 1 inserted in the guide 2 is operated by manipulating the handle 4, and the lower end thereof is manually laid. Let it penetrate. When the tip of the rod reaches the bottom surface 10 of the paved sand layer 8, that is, the boundary between the paved sand layer 8 and the ground 11 therebelow by this penetration operation, the penetration resistance changes. You will know that you have penetrated 8.

When sand is applied after the surface covering material such as a net or a sheet has been laid on the ground, the tip of the rod comes into contact with the surface covering material, making it impossible to penetrate. The penetration of the sand layer 8 can be known.

By measuring the relative height of the penetrating rod 1 with respect to the guide 2 at the time when the tip of the penetrating rod 1 penetrates the sand layer 8, the distance from the plate 5 to the tip of the penetrating rod 1, that is, The thickness H of the spread sand layer 8 through which the rod 1 penetrates can be known.

Further, the penetrating rod 1 is provided with a scale 12, which is read from the window 6 to measure the penetrating depth by the moving length with respect to the guide 2.

In this way, the thickness H of the spread sand layer 8 is measured, the amount of sand spread is adjusted based on this, and the thickness of the spread sand layer of a required thickness is controlled.

[0016]

As described above, in the apparatus and method for measuring the thickness of the sand bed of the water bottom of the present invention, the plate at the lower end of the straight guide is brought into contact with the surface of the spread sand layer, and the penetrating rod is placed along the straight guide. Since the thickness is measured by pressing it into the bed layer, the bed layer thickness can be measured directly, and accurate thickness measurement is possible even when the water bottom ground sinks due to bed sand. However, it is possible to improve the economic efficiency by not spreading sand more than expected.

Further, since the measurement can be directly read by visual observation, anyone can perform the measurement without requiring special skill and skill, and accurate sand sprinkling construction management can be easily performed.

[Brief description of drawings]

FIG. 1 is a front view of an example of a device of the present invention.

FIG. 2 is a front view showing the same penetrating rod with a part thereof omitted.

FIG. 3 is a cross-sectional view showing an example of a construction state of the method of the present invention.

[Explanation of symbols]

 1 Penetration Rod 2 Straight Guide 3 Tip Penetration Metal Fitting 4 Handle 5 Sand Layer Surface Abutting Plate 6 Window 7 Sand Sprinkling Head 8 Sand Layer 9 Work Vessel 10 Bottom 11 Ground 12 Scale

Claims (2)

[Claims] 1. A penetrating rod having a tip fitted into a bed layer, a straight guide for guiding the penetrating rod, and a sand layer surface abutting plate fixed to the tip of the guide and abutting against the bed layer surface. An underwater sand layer thickness measuring device comprising 2. A penetrating rod having a tip fitted into the bed layer, a straight guide for guiding the penetrating rod, and a sand layer surface abutting plate fixed to the tip of the guide and abutting against the bed layer surface. Using a water bottom laid sand layer thickness measuring device comprising, with the sand layer surface contact plate in contact with the laid sand layer surface of the water bottom, press fit the penetration rod from the surface of the laid sand layer, after the press-fitting start The method for measuring the water-bed sand layer thickness in which the penetration depth of the rod is measured by detecting the penetration of the sand layer by the change in the press-fitting resistance of the rod and measuring the relative position between the rod and the guide at that time.