JPH05118015A - Construction of pile-type marine structure - Google Patents

Abstract

PURPOSE:To construct a marine structure safely and economically in a short time. CONSTITUTION:A marine structure 1 having pile holes 2 is temporarily set in a state of being floated on water on a place and piles are inserted into the pile holes 2 to set up the structure 1 on a given position. The marine structure 1 can thus be easily and exactly set on the given position without the needs for using driving part for setting piles precedently. The construction can also be safely and economically attained in a short time without affected by sea weather such as wind and tidal waves.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a method of constructing an offshore structure such as a jetty or a breakwater in a harbor or the like.

[0002]

2. Description of the Related Art Conventionally, a pile-type marine structure is constructed by first placing a pile and then providing a skeleton called a superstructure on the head of the pile. For this purpose, a method of constructing supports for striking concrete on a pile, placing a formwork and reinforcing bars on this to place concrete, and manufacturing beams and slabs made of reinforced concrete on land, Welding to the concrete and placing concrete on the connecting part and its upper part, a method of making a member with a hole with an inner diameter slightly larger than the outer diameter of the pile on land and inserting this into the pile and stacking it It is common. There are also floating piers in which floating structures are only moored to piles.

[0003]

In all the above methods, the piles are first driven, and then the skeleton is built or installed. The accuracy of the installation position of the offshore structure is the accuracy of the installation position of the piles. Will be greatly influenced by. For this reason,
The work of placing the piles was done carefully so as to accurately place the piles in the specified positions using conductive materials, etc., which was quite troublesome. In addition, the work of pile driving and superstructure work is offshore work, and depending on the method, diving work may be required.Therefore, the operation rate often decreases significantly due to the influence of sea conditions such as wind and waves, and it is generally long. It took a construction period. The present invention has been made in view of such a point, and an object thereof is to enable safe and economical construction in a short period of time.

[0004]

In order to solve the above-mentioned problems, the present invention preliminarily manufactures a skeleton of an offshore structure having a hole for driving a pile at a predetermined position, and the skeleton is floated on the water. After being temporarily fixed in the planned installation location in such a state, the pile is inserted into the pile driving hole and driven, whereby the frame is set at a predetermined position. If the skeleton is a floating structure, it can be floated on the water by using the buoyancy of the skeleton itself, but if the buoyancy is insufficient or it is not a floating structure, float it by using a floater etc. Good. The skeleton is fixed in place by fastening it to the pile after placing it, but if it is necessary to move up and down according to the ebb and flow, such as a floating pier, do not bind it to the pile and move it away from the pile. It is prevented from moving from the predetermined position by the connecting means which does not exist.

[0005]

[Function] The body can be manufactured easily and efficiently because it can be manufactured at an appropriate place such as land that is not affected by the weather.
Also, it can be easily moved to the installation location by a method such as towing. When temporarily fixing the skeleton to the planned installation location, it is easy to accurately place the skeleton itself even by using temporary fixing piles that do not require so much accuracy. The structure is correctly installed at a predetermined position by using the.

[0006]

EXAMPLES Next, the illustrated examples will be described. Figure 1
Shows an example of a frame structure, 1 is a frame, and 2 is a pile driving hole. The body 1 is made of steel, concrete, synthetic resin, etc., but the material is arbitrary, but it is a floating structure.
For example, it has a structure including a frame 1a and a hollow portion 1b.
A plurality of pile driving holes 2 penetrate the frame 1 in the vertical direction, and a plurality of pile driving holes 2 are provided according to the expected number and position of the piles.

Next, an example of the procedure of this construction method will be described with reference to FIGS. First, a skeleton 1 as shown in FIG.
It is manufactured in the floating dock 3 as described above or in a land yard, and is towed by a tugboat 4 to a planned installation location as shown in FIG. 3, for example. FIG. 4 shows an example of a method of temporarily fixing the skeleton 1 at the planned installation place. (A) is an example of fixing using the temporary fixing pile 5, and (b) is placed on the skeleton 1. An example in which a winch 6 is used for fixing with an anchor 7, and (c) shows an example in which a SEP (self-elevating work platform) 8 is used for fixing.

When the installation position is determined by these methods, the pile is then driven as shown in FIG. This is done by inserting the pile 11 into the pile driving hole 2 of the frame 1 from above and using, for example, a vibro hammer. Reference numeral 12 indicates a work boat. Pile 1
1 is generally a steel pipe pile, and a steel pipe 13 is also used on the upper inner surface of the pile driving hole 2 as shown in FIG. 8, so that the pile 11 does not come into direct contact with the frame 1 during driving. It is desirable to provide appropriate prevention means. FIG. 8 is an example thereof, in which a plurality of rollers 14 are arranged at the upper end of the pile driving hole 2 so as to surround the pile 11, and are fixed to the steel plate 13 a above the steel pipe 13. Reference numeral 15 is an anchor muscle. If the outer diameter of the pile 11 is, for example, 600 mm, the inner diameter of the steel pipe 13 is 80
The distance between the opposing rollers 14 is selected to be about 0 mm and about 700 mm, respectively.

When the driving of the piles 11 is completed, the PC steel bar 16 is attached to the anchor bolts for suspension (not shown) that were embedded in the body 1 at the time of production, and the channel steel 17 installed on the heads of the piles 11 was used. (Figs. 6 and 9). Then, the PC steel bar 16 is tightened by using the jack 18, and the entire skeleton is pulled up to be in a suspended state, whereby the skeleton 1 is fixed to the pile 11. It should be noted that this work can be performed without using a jack if tidal tide is used, and the length of the PC steel bar 16 can be adjusted at the time of high tide and suspended using the low tide. Is. In this case, there is a possibility that the surface will rise again at the next high tide, but by pouring water into the body 1, the rising can be prevented. Further, when it is necessary to securely fix the frame 1 to the pile 11, it may be fixed by a method such as welding using the steel plate 13a around the pile driving hole 2 or the like.

When the skeleton 1 is fixed in this manner, the upper concrete 19 is placed on the upper surface of the skeleton as shown in FIG. 7, and the construction is completed. FIG. 7 shows an example of a structure such as a fixed pier. Since it is embedded in the upper concrete 19, corrosion of the PC steel bar 16 is prevented, and the channel steel 17 and the upper ends of the piles 11 are also in the concrete. The result is an offshore structure with a flat top surface that is embedded in. Note that, depending on the application, when it is not necessary to place the upper concrete 19, or when the skeleton 1 has been manufactured up to the final finishing stage, the construction is completed by fixing the skeleton 1 and the piles 11. Further, when the target offshore structure is, for example, a floating pier, the skeleton 1 can be moved up and down along the stake 11 according to the ebb and flow without fixing the skeleton 1 to the stake 11, and at the time of high tide, the stake 1 to the stake 11 So that it does not come out.

The above description is based on the premise that the skeleton 1 is a floating structure and has sufficient buoyancy. However, when the buoyancy is insufficient or when the skeleton 1 does not have buoyancy like a reinforced concrete beam. The buoyancy may be supplemented by the use of a floater or the like, or the buoyancy may be applied.
10 and 11 show an example of constructing an offshore structure from the beam-shaped frame 1. As shown in FIG. 10 (a), the beam-shaped frame 1 is formed.
The floater 9a is used to give buoyancy, the pile 11 is inserted into the pile driving hole 2 in the same manner as described above, and the pile 11 is driven using the vibro hammer 9b as shown in (b). Then, as shown in FIG. 11, the skeleton 1 is pulled up to a predetermined height by a jack as shown in FIG. 11A, and the skeleton 1 and the pile 11 are tightly connected to each other via the plate 21 as shown in FIG. 11B. Then, as shown in (c), frame 1
After the precast plate 22 is installed on the above, the upper concrete 23 is placed as shown in (d).

[0012]

EFFECTS OF THE INVENTION As is apparent from the above-described embodiments, the present invention is to preliminarily fix a pre-manufactured skeleton in a state of floating above water at a planned installation location, and then to install a pile driving hole in the skeleton. The stake is inserted and driven into the slab to set the skeleton at a predetermined position. Therefore, unlike the conventional construction method for offshore structures where the piles were first driven to build or install the structure, it is not necessary to carefully perform the work of driving the piles using conductive materials, etc. It becomes easy to install in the correct position. In addition, it is only necessary to carry out the minimum required sea work, and it is possible to carry out construction safely and economically in a short construction period with little influence of sea conditions such as wind and waves. By manufacturing the skeleton according to the scale, it becomes possible to construct the target offshore structure relatively easily.

[Brief description of drawings]

FIG. 1 is a plan view and a side view of a body according to an embodiment of the present invention.

FIG. 2 is a schematic view showing a manufacturing state of a skeleton in the example.

FIG. 3 is a schematic view showing a moving state of a skeleton in the embodiment.

FIG. 4 is a schematic view showing an example of a temporarily fixed state of the body in the same embodiment.

FIG. 5 is a schematic view showing a driving condition of the pile in the embodiment.

FIG. 6 is a schematic view showing a fixed state of the pile and the skeleton in the same example.

FIG. 7 is a schematic view showing a finished state in the example.

FIG. 8 is a plan view and a cross-sectional view of a pile driving hole in the example.

FIG. 9 is a plan view and a cross-sectional view of the upper end of the pile in the example.

FIG. 10 is a schematic diagram showing a construction procedure in another embodiment.

[Explanation of symbols]

 1 Core 2 Pile driving hole 11 Pile

[Procedure amendment]

[Submission date] October 15, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Fig. 11

[Correction method] Added

[Correction content]

FIG. 11 is a schematic view showing the procedure of the same construction.

Claims (1)

[Claims] 1. A structure for an offshore structure having a hole for driving a pile at a predetermined position is manufactured in advance, and the structure is temporarily fixed to a planned installation place in a state of floating above the water, and then used for driving the pile. A method for constructing a pile-type marine structure, characterized in that a skeleton is installed at a predetermined position by inserting a pile into the hole and driving it.