JPH01165912A - Apparatus for detecting inclination of steel plate cell - Google Patents

Abstract

PURPOSE:To accurately measure a liquid surface and to accurately detect the inclination of a steel plat cell, by providing a float in a rising pipe to prevent the liquid surface from getting up by vibration at the time of the placing of the steel plate cell to minimize the effect of vibration. CONSTITUTION:Two liquid receiving communication pipes 10A, 10C respectively communicating with two points A, B opposed in the before-and-behind direction of the circumference and two points C, D opposed in the left-and-right direction are provided on the placing apparatus of the base ring 4 positioned on a steel plate cell. Then, floats 12 are provided on the liquid surfaces in rising pipes 11 respectively erected at respective two points. These liquid surfaces are measured by the ultrasonic water gauges provided above the floats 12 and the water-pressure gauges provided to the under surfaces of the floats. At this time, the outer diameter (d) of each of the floats 12 is formed so as to be made slightly smaller than the inner diameter D of each of the pipes 11 and the float 12 is filled with ballast 13 such as clay. Then, by adjusting the ballast 3 so that the protruding height 11 of the top part U of each float 12 from the liquid surface W in each pipe 11 becomes a desired degree, the getting-up of the liquid surface W due to the vitration thereof is prevented even at the time of the placing of a cell body.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for detecting the inclination of an embedded type steel plate cell body.

[Prior art]

In recent years, as the use of Japan's sea areas has become more diverse and sophisticated, there has been an urgent need to create deep-water structures with higher precision. The steel plate cell construction method, in which the cell body is driven directly into the seabed, is used.

In this construction method, multiple vibrohammers are operated in synchronization to drive the steel plate cell body while transmitting powerful vibration energy evenly to the steel plate cell body.Then, a strong wall is immediately filled with sand filling. This system is attracting attention as a system that allows offshore work on deep-sea structures to be carried out quickly, accurately, and economically.

However, when driving the steel plate cell body in the above-mentioned embedded steel plate cell construction method, it is important to always maintain the levelness of the steel plate cell body. Control is paramount to achieving accurate vertical driving.

Therefore, in order to be able to grasp information on the levelness of a steel plate cell body in real time when driving the steel plate cell body in the embedded type steel plate cell construction method, Japanese Patent Application Laid-Open No. 62-134518 on a method for measuring the inclination of a embedded type steel plate cell body was published. inventions have been made.

In this invention, a liquid storage body is provided upright on two opposing points of a base ring located on a steel plate cell body, and these are communicated through a communication pipe, and in the vicinity of the liquid storage body,
A pressure receiving body is provided in fluid communication with the communication pipe and the liquid storage body, and a gas layer is provided on top of the liquid in the pressure receiving body, and at least one set consisting of the liquid storage body, the communication pipe, and the pressure receiving body that communicates with the liquid is provided. A pair of opposing pressure receiving bodies are provided in a direction perpendicular to the line connecting the two opposing points, and the upper parts of the opposing pressure receiving bodies are connected to pressure transducers, and the pressure difference between the opposing pressure receiving bodies is detected and the steel plate cell body is It is characterized by measuring the slope of

However, as in the above method, the liquid level of the liquid storage bodies installed upright at two points connected by a communication pipe vibrates violently when the steel plate cell body is hit with a vibrohammer, and the liquid level moves. However, there was a problem in that accurate measurements could not be made.

[Object of the Invention] The present invention has been made in order to solve the above-mentioned conventional problems.Even when driving a steel plate cell body in the embedded steel plate cell construction method, etc., the vibrations are not transmitted to the measuring part. <<The object of the present invention is to provide a steel plate cell inclination detection device that can accurately measure the liquid level.

[Structure of the invention]

The steel plate cell inclination detection device of the present invention, which can achieve the above object, has two points facing each other in the front and back direction on the periphery of a driving device such as a base ring located on a steel plate cell body, and two points facing each other in the left and right direction. Two liquid storage communication pipes are provided that communicate with each of the two points, and a float is placed above the liquid level in the riser pipes installed at each of the two points, so that the liquid level in each riser pipe can be controlled at each level. This is characterized in that measurement is performed using measurement devices such as an ultrasonic water level gauge provided above the floats and a water pressure gauge provided on the bottom surface of each float.

By floating a float in each riser pipe as described above, it is possible to prevent the liquid surface from undulating due to vibrations during steel plate cell casting, minimize the effects of vibration, and ensure accurate liquid level measurement. Tilt can be detected correctly.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for measuring the inclination of a steel plate cell body during construction using the steel plate cell construction method will be described below with reference to the drawings.

As shown in Figure 4-A, this embedded steel plate cell construction method uses steel plate cell bodies 1 that have been fixed together in advance on the water surface W.
, L. In order to directly drive into the seabed ground 2 below, after positioning, as shown in Figure 4-B, the upper end of the steel plate cell body 1 is integrated with the base ring 4 by the hydraulic chuck 3, and , a plurality of vibrohammers 6 are arranged, each of these vibrohammers 6 is connected by a shaft 7 and operated in synchronization, and powerful vibration energy is uniformly transmitted to the steel plate cell body 1 via the hydraulic chuck 3. At some point, the steel plate cell body 1 is cast into the seabed ground 2, and after the casting, filling sand 8 is filled as shown in Fig. 4-0 to complete the casting.

Next, two points A and B facing each other in the front and rear direction around the base ring 4, which is a steel plate cell casting device located on the upper part of the steel plate cell body 1 as shown in FIG. Two liquid storage communication pipes 10A and IOC are provided to communicate two points C2D facing each other, and the communication pipe 10
A float having a cylindrical watertight structure as shown in FIG. 2 is installed in each riser pipe 11 shown in FIG. 12 each are floating.

Furthermore, an ultrasonic water level gauge 14 is installed above each riser 11.
are arranged to measure changes in the float upper surface U in each riser 11.

The outer diameter d of this float 12 is formed to be slightly smaller than the inner diameter of the riser pipe 11, and as shown in FIG. 3, a ballast 13 such as clay is placed inside to adjust the floating state. For example, if the inner diameter of the riser 11 is 50 mm, the outer diameter d of the float 12 is set to 48 mm to reduce the gap, and the height H of the top of the float 12 protrudes from the liquid level W in the riser 11. By adjusting the ballast I 13 so that the value is approximately 2011111, even when the steel plate cell body 1 is cast, changes in the liquid level W can be suppressed while suppressing the ripples caused by vibrations of the liquid level W in the riser pipe. It has been confirmed through experiments that it is preferable for measuring with good accuracy.

As described above, while comparing each change in the liquid level W in the riser pipe 11 at each point A, B, C, D on the front, back, left and right sides of the base ring 4 using a computer etc., the inclination of the steel plate cell body 1 is By displaying the measurement results on a cathode ray tube or the like, the driver can grasp the placement status in real time.

In the above embodiment, changes in the upper surface U of the float are measured by the ultrasonic water level gauge 14, but a normal water level gauge may also be used, or a water pressure gauge may be provided at the bottom of the riser pipe 11 to measure the liquid pressure in the riser pipe. It is also possible to measure changes in .

〔Effect of the invention〕

By adopting the inclination detection device of the present invention, information on the horizontality of the steel plate cell body when driving the steel plate cell body can be grasped in real time, and the inclination of the steel plate cell body can be adjusted immediately in accordance with that information, making it possible to accurately This makes it possible to perform deep-rooted steel plate cell construction, and the casting work can be performed quickly and accurately.

In particular, in the present invention, since the float is floating in the riser pipe whose bottom part is communicated with the communication pipe, it is possible to prevent the liquid surface from undulating due to vibrations during pouring of the steel cell body, and when measuring the liquid level, the above-mentioned Since vibrations are less likely to be transmitted, there is an advantage that more accurate inclination measurement can be performed, and since only a float is provided, the cost is low and economical.

[Brief explanation of the drawing]

Fig. 1-A is a schematic plan view of a steel plate cell inclination detection device according to an embodiment of the present invention, and Fig. 1-B is a schematic plan view of the I--
Figure 2 is an enlarged side sectional view of the main part of the riser pipe in Figure 1-B, Figure 3 is an enlarged side sectional view of the float in Figure 2, Figure 4-A, Figure 4 Figures -B, 4-C and 4-C are a series of side views showing the embedded steel plate cell construction method. 1... Steel plate cell body, 4... Base ring, ■OA. 10C...Communication pipe, 11...Rise pipe, 12...
Float, 14... Ultrasonic water level gauge, A, B... Points facing each other in the front-back direction, C, D... Points facing each other in the left-right direction. Agent Patent Attorney Nobuo Ogawa −

Claims (1)

[Claims] Two liquid storage communication pipes are provided that communicate with two points facing each other in the front-rear direction and two points facing each other in the left-right direction on the surroundings of the steel sheet cell casting device, and stand-up pipes are installed at each of the above two points. A steel plate cell tilt detection device that has a float floating above the liquid level in each riser pipe to measure the liquid level in each riser pipe.