KR102273648B1 - Construction method of a sub-pier extending from the shoreline to the water. - Google Patents

Abstract

Provided is a method from constructing a floating pier. The method comprises: a ground investigation step (A) of investigating the seabed on which a floating pier is to be installed, and designing the depth, insertion location, and installation section of steel pipe casings to be inserted into the seabed; a pile construction step (B) of performing drilling at seabed locations designed in step (A) by using a pile device, and then installing steel pipes; a boring step (C) of discharging seawater, soil, sand, and the like, existing inside the steel pipes installed in step (B), to the outside, installing support devices inside the steel pipes, and then pulling and collecting the steel pipes; a reinforcement step (D) of placing concrete inside the support devices having undergone step (C), drying the same, and installing upper brackets; a rail deck installation step (E) of installing, on an upper bracket of step (D), a rail deck having a rail shape formed by connecting horizontal and vertical members; and a deck installation step (F) of installing and extending a floating pier by a target length by repeating steps (B) to (E), and installing a deck having a rectangular plate structure on the rail deck to complete the floating pier. A drilling machine can be moved on the installed support devices, and thus the floating pier can be easily constructed even in a water environment and working hours and construction costs can be reduced.

Description

Construction method of a sub-pier extending from the shoreline to the water.

The present invention relates to a method for constructing a floating pier to be installed on water, and to a method for constructing a floating pier that can reduce work time and construction cost by embedding and installing a support in the seabed, making it easier to construct even in a water environment.

As alternative spaces are needed due to the depletion of ground space due to the huge industrial scale and restrictions on the use of land space due to civil complaints, the need for the use of water space is increasing. Recently, in Korea, the installation of water structures is increasing in relation to the use of water space.

Water structures refer to structures installed on the water and can be classified into fixed, semi-submersible, and floating types according to water depth. These water structures may be used as leisure, harbor and environmental facilities.

In order to install a water structure in a fixed manner, it is necessary to install a plurality of piles on the seabed made of soft ground so that the water structure is not shaken by waves. In general, as a pile construction method for reinforcing the soft ground of the coast or for the foundation construction of a building structure, the method of placing the pile directly on the ground and the method of excavating the ground and burying the pile are representative.

The buried structure consists of a structure in which a fixed structure such as a driving support and a cast-in-place support is installed on the seabed on the seabed to be installed, and a deck is installed on the upper part of the fixed structure.

The method of pouring piles directly into the ground is a method in which a heavy body such as a hammer is raised using a lifting rope or hydraulic pressure of a hydraulic unit and then lowered to hit the upper part of the pile to place the pile into the ground.

In addition, the method of excavating the ground to bury the piles is a method in which a screw drills the ground using a ground excavation equipment and embeds the piles in the perforation hole, and a casing is used to prevent collapse of the perforated ground.

The structure of the ground excavation equipment consists of a screw auger and a casing auger installed on the leader standing upright on heavy equipment such as a crane, and a screw and a casing installed on the bottom of the screw auger and the casing auger, respectively, to excavate the ground while rotating in different directions. do. As the casing is inserted into the ground, the screw that rotates in the opposite direction discharges the soil inside the casing to the outside, and after the pile is buried, the casing is withdrawn.

When installing a structure on the water, it is necessary to design the foundation by fully understanding the importance of the structure and the soil condition of the foundation ground. In particular, if the seabed ground is soft, stability of the foundation, subsidence of the ground, liquefaction during earthquakes, etc. After reviewing, it is necessary to decide on the basic format.

Accordingly, the present invention intends to provide a method for constructing an auxiliary pier in which the support is embedded in the seabed, and the construction is easier even in an aquatic environment, thereby reducing working time and construction cost.

Domestic Patent No. 10-1487650 discloses an offshore boring system in which a working barge and a boring excavator are separated so as not to be affected by waves when drilling is performed with offshore boring of large water depth. Domestic Registration Patent No. 10-1665638 describes a method of constructing a floating pier by the water-top connection structure of the enclosure, which allows the enclosure made of concrete to be integrated in a solid and watertight state while floating on the water. is disclosed about it. Domestic Patent No. 10-1353950 discloses an upper structure forming a movement path, a bracket connected to the lower side of the upper structure, and a floating pipe inserted into the bracket parallel to the upper structure and sealed at both ends; It is inserted into the bracket parallel to the flotation pipe and at least one end is open and discloses with respect to a multifunctional pier pier having a rolling prevention pipe filled with water therein. In Korea Patent No. 10-1291288, a plurality of buoyancy pipes are embedded in the inside of the concrete deck, and helium gas can be injected into the inside of the buoyancy pipe, and a drainage channel is installed on the upper surface of the concrete deck. And, it is disclosed with respect to a concrete floating pier with a buoyancy member installed on the concrete deck.

In order to solve the problem of floating pier construction, which is difficult to work in a coastal water environment, the present invention can be constructed by embedding the support in the seabed and moving the perforator from the upper part of the support, so it is easier to construct even in a water environment, resulting in work time and construction cost It is intended to provide a method of constructing an auxiliary pier that can be reduced.

The auxiliary pier construction method according to an embodiment of the present invention includes a ground investigation step (A) of irradiating the seabed ground to install the auxiliary pier; A pile construction step of installing a steel pipe after performing a drilling operation at an onshore location using a pile device (B); a boring step (c) of discharging seawater, soil, sand, etc. existing inside the installed steel pipe pipe to the outside, installing a support pipe inside the steel pipe pipe, and withdrawing and collecting the steel pipe pipe; The support pipe is made of a pipe structure of a certain length with both ends open, and the support pipe is made of a double structure in which the outside of the galvanized steel pipe is coated with PE material or high-density polyethylene material, and concrete is placed inside the support pipe. After drying, the reinforcement step (d) of installing an upper bracket on the upper part of the support pipe; A rail deck formed in a rail shape by connecting horizontal and vertical members to the upper bracket is installed to extend in the sea direction, and the rail deck has a rotary workbench and a pile device on the track-type push/pull workbench that can move forward and backward along the track. A rail deck installation step (E) which is installed, and a buoyancy pontoon 45 is installed at the end of the workbench; A pile construction step of installing a steel pipe after performing a drilling operation at the position of the rail deck installed extending in the sea direction (bar); And repeating the steps (C) to (E) to extend to the target length of the auxiliary pier and install the deck part of the square plate structure on the upper rail deck to complete the auxiliary pier of a certain length (G) it could be

In addition, the support device is composed of a lower bracket having an open upper portion and a narrow downward structure, and a support pipe having a pipe structure of a certain length with both ends open, and the lower bracket upper opening is a lower opening of the support pipe. It may be made by being inserted and fixed with

The present invention has the effect that the perforator can be moved on the installed support by embedding the support in the seabed, so that construction is easier even in an aquatic environment, thereby reducing working time and construction cost.

1 shows a schematic diagram of a sub-pier construction method of the present invention.
2 shows a support device of the present invention.
Figure 3 shows a perspective view in which the rail deck is installed according to step (E) of the present invention.
4 shows the auxiliary pier completed according to step (f).
5 shows a perspective view of the handrail.

Hereinafter, it will be described in detail with reference to the drawings related to the auxiliary pier construction method of the present invention.

1 shows a schematic diagram of the construction method of the floating floating pier of the present invention. The auxiliary pier construction method of the present invention includes a ground investigation step (A) of examining the underwater ground to install the auxiliary pier, and designing the depth and insertion location and installation section of the steel pipe casing to be inserted into the seabed; A pile construction step (b) of installing a steel pipe after performing a drilling operation at the seabed location designed in step (a) using a pile device; A boring step (c) of discharging seawater, soil, sand, etc. existing inside the steel pipe installed in step (b) to the outside, installing a support device inside the steel pipe, and withdrawing the steel pipe to recover; Reinforcing step (d) of installing the upper bracket after putting concrete into the support device that has undergone the step (c) and drying it; A rail deck installation step (E) of installing a rail deck in which horizontal and vertical members are connected to the upper bracket of step (D) to form a rail shape; Repeat steps (B) to (E) above to extend the length of the auxiliary pier to the target length, and install the deck portion having a square plate structure on the upper rail deck to complete the auxiliary pier installation step (bar).

(A) Ground survey stage

The ground investigation step (A) of the present invention may include the step of examining the seabed ground to install the floating floating pier. The investigation may include a sample collection by drilling a target seabed ground and an in-situ test using a boring hole.

The ground investigation step according to the present invention collects basic data for a safe structure design by identifying engineering characteristics during the floating structure installation step to be described later, and the depth and insertion position of the steel pipe casing inserted into the seabed in the pile step to be described later and installation planning steps such as designing an installation section.

(B) Coastal land foundation work and rail deck installation stage

Figure 2 shows a schematic diagram of the ground work and rail deck installation steps. Coastal land foundation work and rail deck installation step (B) is a foundation work for installing a floating pier connected from the land to the water surface in the area where the ground survey is completed.

In order to install the floating pier in the water direction from the coastal land, which is the starting point of the floating pier, drilling is performed on the coastal land starting line using a pile device on the coastal land, and then pile construction for inserting the steel pipe is carried out, and the steel pipe is installed inside the installed steel pipe. Existing seawater, soil, sand, etc. are discharged to the outside, a support device is installed inside the steel pipe pipe, and a boring step of drawing and recovering the steel pipe pipe is performed (FIG. 2A).

After drying the concrete 105 inside the support device, the upper bracket is installed, and the horizontal and vertical members are connected to the upper bracket to install a rail deck forming a rail shape to form a foundation for advancing in the water direction. (Fig. 2B).

3 shows a support device installed on land and on the seabed according to the present invention. The support device 100 of the present invention may be composed of a lower bracket 10 with an open upper portion and a narrow downward structure and a lower bracket 10 with both ends open and a support pipe 20 formed in a pipe structure of a certain length, Preferably, the support pipe is made of a PE-coated steel pipe.

According to the embodiment of the PE-coated steel pipe pipe of the present invention, the outer coating part of the pipe is made of a high-density polyethylene (HDPE) material and can be manufactured by extrusion molding, and the thickness is formed to be about 10T or more to maintain robustness. can be PE-coated steel pipe is manufactured by coating PE material or high-density polyethylene (HDPE) material on the outside of the steel pipe using an extrusion molding machine, and it is inserted into the upper fixing groove of the floating unit when assembling the pontoon to improve the durability of the overall structure.

In addition, the PE-coated steel pipe pipe may have a coated pipe structure in which the outer pipe is made of a polyethylene material, and the inner pipe is formed of a galvanized pipe pipe installed inside the outer pipe.

For the bolts used to fix the support pipe, stainless steel or galvanized material is used to prevent corrosion, and a spring washer is used to prevent loosening.

In addition, by using a metal material as an inner connection pipe, an outer pipe formed of a polyethylene material can be extruded to the outside of the inner pipe and manufactured. From this, the support pipe of the present invention can prevent corrosion such as seawater by improving the durability of the overall structure.

In addition, if necessary, the upper opening of the lower bracket may be formed by inserting and fixing the lower bracket into the lower opening of the support pipe by forming an insert that can be inserted into the lower opening of the support pipe. The lower part of the lower bracket has a structure in which the width is narrowed downward, so it is easy to be fixed to the seabed terrain.

When the basic foundation is completed on the coastal land, a rail-shaped rail deck 40 is installed in which horizontal and vertical members are connected to the upper part of the installed support device. A rotary workbench is installed on the upper portion of the orbital push/pull workbench on the rail deck, and a pile device is installed on the upper portion of the rotary workbench, and it is possible to move forward and backward along the track.

To this end, a cantilever-type pile device is installed and fixed by pushing the track-type workbench to the desired length in the direction of work. If the length of the cantilever 80 is too long and the sagging of the workbench is severe, a buoyancy pontoon 45 is installed at the end of the workbench so that the rail deck can be maintained horizontally. By repeating pile construction and boring work while moving the work table in the work progress direction, the length of the auxiliary pier is extended in the work progress direction, and the supporting device of the auxiliary pier is installed.

(C) Pile construction stage at sea

The pile construction step of the present invention includes the step of installing a steel pipe after performing a drilling operation at the seabed position designed in step (a) using a pile device. At this time, it is appropriate that the location and area where the pile construction work is performed should be carried out as much as the location and area that can be supported when the pile device moves along the rail-shaped upper deck after the rail installation step to be described later.

The pile device referred to in the present invention includes a pile driver including a drilling machine or a driving machine, and as the main equipment for pile construction, the drilling length is determined by the leader length, and can be drilled by mounting each auxiliary equipment, and It can move on rails by Figure 4 shows a schematic diagram in which the rail deck is installed along the sea direction and the operation is made.

(D) Boring step

The boring step of the present invention includes discharging seawater, soil, sand, etc. existing inside the steel pipe pipe installed above to the outside, installing the support device inside the steel pipe pipe, and then withdrawing the steel pipe pipe and recovering it.

Seawater, soil, sand, etc. existing inside the steel pipe may be discharged by a device such as a pump. In addition, the support device can be supported on the seabed without a separate operation because soil is accumulated in the seabed space in which the steel pipe pipe was inserted by going through the step of drawing the steel pipe pipe.

(E) Reinforcement stage

Reinforcing step according to the present invention includes the step of installing the upper bracket after putting concrete in the support device inserted and supported on the seabed in the boring step and dried. By increasing the durability of the supporting device while the concrete introduced into the supporting device is dried inside the supporting device, the floating pier according to the present invention can withstand water pressure and digging height.

In the reinforcement stage, when cement is injected into the PE-coated steel pipe forming the support pipe of the supporting device, a part of the cement grouting has the effect of filling the space between the casing installed and the PE-coated steel pipe. There is no need to install a separate bracket.

At this time, the upper bracket 30 is installed on the upper part of the installed support device. The upper part of the upper bracket is formed with a fixing part that can fix the rail deck. The upper bracket fixing part according to an embodiment of the present invention can be fixed by fitting the lower part of the horizontal member of the rail deck made of a fitting structure.

(F) Deck part installation stage

The deck portion installation step according to the present invention includes the step of completing the auxiliary pier by repeating the step (E) and installing the deck portion 70 of the square plate structure on the upper rail deck installed with a set length. Figure 5 shows the deck part is installed and completed the auxiliary pier.

A handrail 50 may be additionally installed on the deck portion. 6 shows a perspective view of the handrail. The handrail part includes a lower fixing part 53 installed on the upper part of the deck part, and a handrail pipe 52 having a pipe structure installed in the lower fixing part, and at least one of the lower fixing part and the handrail pipe is installed, and the handrail pipe The handrail 51 is installed perpendicular to the installation direction and may be formed by connecting a plurality of handrail pipes.

(G) Installation stage of rail deck extending in the sea direction

This installation step is a step in which the rail deck 40 for extending the deck part installed in the step (bar) in the sea direction is installed. On the rail deck installed extending from the deck, a rotary workbench is installed on the track-type push/pull workbench, and a pile device is installed on the rotary workbench to move forward and backward.

Push the track-type workbench to the desired length in the direction of work, install a cantilever-type pile device and fix it. If the length of the cantilever beam is too long and the sagging of the workbench is severe, a buoyancy pontoon is installed at the end of the workbench so that the rail deck can be maintained horizontally. The auxiliary pier can be completed by repeating steps (c) to (f) while moving the workbench in the work progress direction to extend the length of the auxiliary pier in the work progress direction. 7 shows a floating pier installed by extending from the coastal land completed by the present invention to the water.

In general, pile construction and boring on water use jackup barges, so the rack (legs) of jackup barges lengthens and the construction scale increases, thereby increasing the construction cost of equipment. In addition, anchors are installed on the trousers and excavated with boring equipment. If it occurs in waves over 1m, it is difficult to work and the number of working days increases.

Therefore, as in the present invention, by installing the foundation support device on the ground as in the present invention, and extending the length of the auxiliary pier by stepwise carrying out pile construction and boring work using the rail deck, stable work is possible on the water, where construction is inconvenient, and the construction cost and It has the effect of keeping the period to a minimum.

By providing the construction method of the floating pier used for the installation of multi-purpose water facilities, it is possible to reduce the construction cost of the floating pier to be installed on the water and to provide an eco-friendly facility, which has industrial applicability.

100: support device 10: lower bracket
20: support pipe 40: rail deck
50: handrail 51: handrail
52: handrail pipe 53: lower fixing part
70: deck part

Claims (3)

A ground investigation step (A) of examining the seabed ground to install a floating pier; A pile construction step of installing a steel pipe after performing a drilling operation at an onshore location using a pile device (B);
A boring step (c) of discharging seawater, soil, sand, etc. existing inside the installed steel pipe pipe to the outside, installing a support pipe inside the steel pipe pipe, and withdrawing and collecting the steel pipe pipe;
The support pipe has a pipe structure of a certain length with both ends open, and the support pipe has a double structure in which the outside of the galvanized steel pipe is coated with a PE material or a high-density polyethylene material,
Reinforcing step (d) of putting concrete inside the support pipe and drying it, and then installing an upper bracket on the top of the support pipe;
A rail deck formed in a rail shape by connecting horizontal and vertical members to the upper bracket is installed to extend in the sea direction, and the rail deck has a rotary workbench and a pile device on the track-type push/pull workbench capable of moving forward and backward along the track. A rail deck installation step (E) which is installed, and a buoyancy pontoon 45 is installed at the end of the workbench;
A pile construction step of installing a steel pipe after performing a drilling operation at the position of the rail deck installed extending in the sea direction (bar); And repeating the steps (C) to (E) to extend the length of the auxiliary pier to the target, and to install the deck part of the square plate structure on the upper rail deck to complete the auxiliary pier of a certain length (G) Construction method of a floating pier extending from the land coast to the water, characterized in that delete delete

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