JP2015099069A - On-water survey table - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an on-water survey table allowing a survey apparatus to be installed in a stable state even on the water on which an external force by a wave, tidal current, or the like acts.SOLUTION: The on-water survey table includes: a cylindrical outer tube 13 for buffering erected on a water bottom part A; an internal pile 14 that is disposed in the outer tube 13 for buffering and is hammered into a water bottom ground so that the upper part projects over the water surface; and a survey apparatus installation pedestal 12 for installing a survey apparatus 4. A clearance 15 is disposed between the outer tube 13 for buffering and the internal pile 14. The survey apparatus installation pedestal 12 is fixed to the upper end of the internal pile 14 in a state separate from the outer tube 13 for buffering. An external force is absorbed by the outer tube 13 for buffering, and the displacement of the survey apparatus installation pedestal 12 fixed to the upper end of the internal pile 14 is suppressed.

Description

  The present invention relates to a water surveying table for installing surveying equipment used for surveying work on the water during offshore construction.

  Conventionally, in the offshore construction of steel pipe piles by a pile driving ship, surveying equipment such as theodolite is installed on the sea or land, and the target such as piles to be placed is collated. Surveying the position of objects.

  At that time, in order to install surveying equipment such as theodolite on the sea, a surveying base installed at the bottom of the water so that the upper part protrudes above the water surface is used, and the work platform is placed on the part of the surveying base that protrudes above the water. And surveying equipment such as theodolite is installed on the work scaffold (see, for example, Patent Document 1).

  As this surveying table, for example, a fixed surveying table as shown in FIG. 6 is used in addition to a movable surveying table in which a bowl-shaped support base is placed on the bottom of water described in Patent Document 1. Yes.

  This fixed surveying table is made of a plurality of pile materials 1, 1..., Such as H-shaped steel piles, which are embedded in the water bottom A and are erected on the water bottom A so that the upper end protrudes above the water surface B. The support base 2 is reinforced with slant piles 3, 3... Whose bottom end is embedded in the bottom A, and a surveying instrument 4 such as theodolite is attached to the top of the support base 2. The work base 5 to be installed is fixed.

Japanese Patent Laid-Open No. 06-346461

  However, in the above-mentioned conventional mobile and fixed surface surveying stations, external forces such as waves and tides act on the support bases installed in the water. Accordingly, the position of surveying equipment such as theodolite installed on the support base becomes unstable, which may cause a decrease in surveying accuracy.

  In addition, the conventional fixed-type surface surveying platform has a working scaffold that places a pile-shaped support base by placing a plurality of pile members and slant piles on the bottom of the water, and installs surveying equipment such as theodolite at the upper end. The installation is complicated and requires a lot of time and labor for the installation work.

  In view of such a conventional problem, the present invention has been made for the purpose of providing a surface surveying table in which surveying equipment can be installed in a stable state even on the surface of water on which external forces such as waves and tides act. .

  The feature of the invention described in claim 1 for solving the conventional problems as described above is that, in a water surveying table for installing surveying equipment on the water, a cylindrical shock absorber is installed on the bottom of the water. A pipe, an inner pile driven into the bottom of the water so that the upper part protrudes above the water surface, and a surveying equipment installation base for installing the surveying equipment. A gap is provided between the outer pipe and the inner pile, and the surveying equipment installation base is fixed to the upper end of the inner pile in an independent state from the buffer outer pipe, and an external force is It is in a surface surveying table that is absorbed by a pipe and suppresses the displacement of a surveying equipment installation base fixed to the upper end of the inner pile.

  The feature of the invention described in claim 2 is that, in addition to the structure of claim 1, a work scaffold is fixed to the upper end of the buffer outer pipe in a state independent of the inner pile.

  The feature of the invention described in claim 3 is that, in addition to the structure of claim 1 or 2, the buffer outer tube is driven into the bottom of the ground.

  According to a fourth aspect of the present invention, in addition to the structure of any one of the first to third aspects, a drainage means for discharging water in the gap is provided, and the gap is in a dry state. .

  As described above, the water surveying base according to the present invention is a water surveying base for installing surveying equipment on the water, and includes a cylindrical buffer outer tube erected on the bottom of the water, and the buffer outer tube And an inner pile driven into the bottom of the water so that the upper part protrudes above the water surface, and a surveying equipment installation base for installing the surveying equipment, and the buffer outer pipe and the inner pile And the surveying equipment installation base is fixed to the upper end of the inner pile in an independent state from the buffer outer pipe, and external force is absorbed by the buffer outer pipe, Because the displacement of the surveying equipment installation base fixed to the top end of the cable is suppressed, even if it is installed in a place where external forces such as waves or tidal currents are applied, the external force is By absorbing, the inner pile is maintained in a stable state and is supported by the upper end of the inner pile. The displacement of the use equipment installation pedestal is suppressed, it is possible to surveying equipment such as theodolites stable, obtain a high survey accuracy.

  In the present invention, since the work scaffold is fixed to the upper end of the buffer outer pipe in a state independent of the inner pile, the heavy work scaffold is made independent of the inner pile, and thus acts on the inner pile. The bending moment is reduced, the inner pile is less likely to swing, and the stability of surveying equipment such as theodolite is improved.

  Furthermore, in the present invention, since the buffer outer tube is driven into the water bottom ground, the buffer outer tube is erected on the water bottom portion in a stable state, and a high buffering effect against external force can be obtained.

  Furthermore, in the present invention, seawater that can serve as a transmission medium for transmitting an external force acting on the buffer outer pipe to the inner pile by providing drainage means for discharging the water in the gap and making the gap portion dry. Etc. can be eliminated from the gap, and the buffering effect is improved.

It is a longitudinal cross-sectional view which shows the outline of an example of the water surveying table which concerns on this invention. (A) is an enlarged plan view of the same, (b) is a sectional view taken along the line aa. It is a longitudinal cross-sectional view in the state in which the external force acted on the water surveying table same as the above. It is an expanded sectional view on the aa line for demonstrating the state of a water surveying table same as the above, (a) is the state where the external force is not acting, (b) is the state where the external force was acting. It is a longitudinal cross-sectional view which shows the outline of another example of the water surveying table which concerns on this invention. It is a schematic front view which shows an example of the conventional water surveying table.

  Next, an embodiment of the surface surveying table according to the present invention will be described based on the examples shown in FIGS. In addition, the same code | symbol is attached | subjected and demonstrated to the structure similar to the above-mentioned prior art example, the code | symbol A is a water bottom part in the figure, the code | symbol B is the water surface, and the code | symbol 4 is surveying equipment, such as theodolite. Reference numeral 10 denotes a water surveying table for installing the surveying equipment according to the present invention on the water.

  The surface surveying table 10 has a cylindrical buffer outer tube 13 erected on the water bottom A so that the upper portion protrudes above the water surface at a desired protruding height, and the upper portion is in the buffer outer tube 13. A surveying equipment installation base 12 includes an inner pile 14 driven into the bottom of the water so as to project at a desired projection height on the water surface, and a surveying equipment installation base 12 fixed to the upper end of the inner pile 14. Surveying equipment 4 such as theodolite is installed on the top.

  The desired protruding height is set so that the upper end is higher than the water surface B1 at the highest water level at the time of high tide indicated by a one-dot chain line in the figure.

  Moreover, this water surveying base 10 is provided with a gap 15 between the buffer outer tube 13 and the inner pile 14, and the buffer outer tube 13 standing on the bottom A and the inner pile driven into the water bottom ground. The surveying equipment installation base 12 is fixed to the upper end of the inner pile 14 so as to be independent from the buffer outer pipe 13.

  The buffer outer pipe 13 is constituted by a cylindrical steel pipe, the lower part is driven into the water bottom ground with a desired penetration depth H1 with the pipe axis direction set vertically, and the upper part on the water surface B with a desired protruding height. It is erected on the water bottom A so as to protrude.

  The portion of the buffer outer pipe 13 that has been driven into the water bottom ground (hereinafter referred to as the outer pipe root insertion part) 13a is filled with water bottom soil and sand in the outer pipe root insertion part 13a. The inner pile 14 is driven into the ground.

  As shown in FIG. 1 and FIG. 2A, the work scaffold 16 is fixed to the upper end of the buffer outer pipe 13 so as to be independent from the inner pile 14, and the worker surveys on the work scaffold 16. You can work.

  The work scaffold 16 has a plurality of support beam members 17, 17... Fixed to the outer surface of the upper end of the buffer outer tube 13 and projecting outward, and the other ends of the support beam members 17, 17. And a frame material 18 having a rectangular frame shape supported on the floor, and a floor plate material 19 is supported on the support beam materials 17, 17... And the frame material 18. doing. Further, a protective fence 20 is erected on the outer periphery of the work scaffold 16 to prevent the worker from falling.

  The floor board material 19 is formed of an iron plate or the like, and a round hole-shaped insertion hole 21 penetrating in the thickness direction is formed at the center thereof. The diameter of the insertion hole 21 matches the inner diameter of the buffer outer tube 13. The floor pile material 19, that is, the work scaffold 16 is independent of the inner pile 14 so that the inner pile 14 and the work scaffold 16 do not interfere with each other.

  Reference numeral 22 in the figure denotes an entrance / exit hole, through which the worker can move up the ladder 23 onto the floor surface of the work scaffold 16.

  The inner pile 14 is formed of a cylindrical steel pipe having an outer diameter smaller than the inner diameter of the buffer outer pipe 13 and is placed in the outer pipe rooting portion 13a at a desired depth H2 with the pipe axis direction oriented vertically. It is driven into the water bottom ground in a coaxial arrangement with the buffer outer tube 13.

  The penetration depth H2 of the inner pile 14 with respect to the water bottom ground is shallower than the penetration depth H1 of the buffer outer tube 13.

  The inner pile 14 is driven into the bottom ground so that the upper part protrudes above the water surface B at a desired protruding height, and a flat plate-like surveying equipment installation base 12 is provided at the upper end of the inner pile 14 as a buffer outer pipe 13. It is fixed in a more independent state.

  The pedestal 12 for surveying equipment installation is composed of a flat steel plate or the like, and is firmly fixed to the upper end of the inner pile 14 by welding or the like so that it is leveled substantially horizontally when the inner pile 14 is driven. Thus, the surveying equipment 4 such as theodolite can be stably placed.

  Further, the surface surveying table 10 is provided with drainage means including a pump device (not shown), and the drainage means discharges the water in the gap 15 so that the portion of the gap 15 protruding from the bottom surface is dry. It can be maintained in a state.

  In the water surveying table 10 configured in this manner, the buffer outer tube 13 and the inner pile 14 form a double tubular structure, and therefore, as shown in FIG. 3 and FIG. The external force due to the above or the like acts only on the buffer outer tube 13, and the buffer outer tube 13 is supported by the water bottom A via the outer tube insertion portion 13a and swings to absorb the external force.

  On the other hand, since the outer periphery is covered with the buffer outer tube 13, the inner pile 14 is not affected by external force due to waves, tidal currents, etc., and the buffer outer tube 13 absorbs the external force, so that the inner pile 14 is maintained in a stable state. Thus, the displacement of the pedestal for the surveying instrument 4 supported on the upper end of the inner pile 14 is suppressed, and the surveying instrument 4 such as theodolite can be maintained in a stable state.

  Further, since the external force due to waves, tidal currents, etc. is absorbed by the buffer outer tube 13, the inner pile 14 can be made to have a depth of penetration H 2 smaller than the depth of penetration H 1 of the buffer outer tube 13. This makes it easy to install.

  Furthermore, in this water surveying table 10, by supporting the heavy work scaffold 16 on the upper end of the buffer outer tube 13 in an independent state from the inner pile 14, the bending moment acting on the inner pile 14 can be reduced. The stability of the surveying equipment installation base 12 supported by the upper end of the inner pile 14 is enhanced.

  Furthermore, in this water surveying table 10, the external force acting on the buffer outer pipe 13 is transmitted to the inner pile 14 by discharging the water in the gap 15 by the drainage means and maintaining the gap 15 in a dry state. Without interposing seawater or the like that can be a medium to be interposed between the buffer outer tube 13 and the inner pile 14, only the buffer outer tube 13 can absorb the external force, and a high buffering effect can be obtained.

  In the above-described embodiment, the example in which the penetration depth H2 of the inner pile 14 is shallower than the penetration depth H1 of the buffer outer tube 13 has been described. However, both the penetration depths H1 and H2 are the same. Alternatively, the penetration depth H2 of the inner pile 14 may be deeper than the penetration depth H1 of the buffer outer tube 13.

  Further, in the above-described embodiment, the example in which the buffer outer pipe 13 is driven into the water bottom ground has been described. However, as shown in FIG. It may be supported and erected on the water bottom A.

  In this case, the buffer outer tube 13 may be provided with a stable structure portion 30 formed of a flange or the like fixed to the lower end edge so as to be able to resist a bending moment acting on the buffer outer tube 13.

  In addition, the aspect of the stable structure part 30 is not limited to the illustrated flange shape, for example, a structure in which a skirt-like member expanded downward is fixed to the lower end of the buffer outer tube 13 or the like. Any structure capable of resisting a bending moment acting on the tube 13 is included.

  Moreover, in the above-mentioned Example, although the example which comprised the inner pile 14 in the cylinder shape which consists of steel pipes was demonstrated, the aspect of the inner pile 14 is not limited to this, What was formed in the other pile shape and column shape It may be.

  Furthermore, in the above embodiment, the surveying equipment installation pedestal 12 is supported by a single inner pile 14, but the surveying equipment installation pedestal 12 is supported by a plurality of inner piles. In that case, a plurality of inner piles may be driven into one buffer outer tube, or one inner pile may be driven into each buffer outer tube.

  Further, in the above-described embodiment, the example has been described in which the surface survey table 10 is provided with drainage means, the water in the gap 15 is discharged by the drainage means, and the gap 15 is in a dry state. The gap 15 may be filled with water such as seawater.

  Furthermore, in the above-described embodiment, theodolite is used as the surveying equipment 4. However, the surveying equipment 4 is not limited to this, and the surveying equipment 4 is a device that is desired to suppress displacement during surveying and position measurement. For example, a light wave mirror or a GPS antenna may be used.

A Water bottom B Water surface B1 Water surface (at the highest water level)
4 Surveying equipment 10 Water surveying base 12 Surveying equipment installation base 13 Buffer outer pipe 14 Inner pile 15 Gap 16 Work scaffolding 17 Support beam 18 Frame material 19 Floor board material 20 Guard fence 21 Insertion hole 22 Entrance hole 23 Ladder

Claims (4)

In the water surveying table for installing surveying equipment on the water,
Install the cylindrical buffer outer tube erected on the bottom of the water, the inner pile inside the buffer outer tube that is driven into the water bottom so that the upper part protrudes above the water surface, and the surveying equipment Equipped with a surveying equipment installation base for
A gap is provided between the buffer outer pipe and the inner pile, and the surveying equipment installation base is fixed to the upper end of the inner pile in an independent state from the buffer outer pipe,
A surface surveying table characterized in that an external force is absorbed by the buffer outer tube and displacement of a surveying equipment installation base fixed to the upper end of the inner pile is suppressed.   The water surveying table according to claim 1, wherein a work scaffold is fixed to an upper end of the buffer outer pipe in a state independent of the inner pile.   The surface surveying table according to claim 1 or 2, wherein the buffer outer tube is driven into a water bottom ground. The water surveying table according to any one of claims 1 to 3, further comprising drainage means for discharging water in the gap, wherein the gap is in a dry state.

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