WO2012157829A1

WO2012157829A1 - Batch-installation-type large-caliber underwater casing installation structure using sheet pile and method for constructing same

Info

Publication number: WO2012157829A1
Application number: PCT/KR2011/009993
Authority: WO
Inventors: 박선근
Original assignee: (주)코아지질
Priority date: 2011-05-13
Filing date: 2011-12-22
Publication date: 2012-11-22
Also published as: EP2708658A1; KR101106219B1; AU2011368478B2; AU2011368478A1

Abstract

The present invention relates to a large-caliber casing installation construction for preventing a collapse or an inflow of an earth layer during excavation of the ground for laying a foundation in the process of building a underwater structure, such as a dam, a bridge, an offshore wind structure under water, such as sea and river. The present invention completes a casing structure by installing a sheet pile between steel pipes and insertingly installing a center piles inside the steel pipes, and as a result, enables batch installation after first assembling the casing structure, and thus, can reduce field work and flexibly respond to irregular grounds underwater during construction.

Description

Batch-mounted underwater large-diameter casing temporary structure using sheet pile and construction method

The present invention is a large-diameter casing installation for the purpose of preventing the collapse or intrusion of the soil layer when excavating the ground for the foundation construction in the process of building underwater structures such as dams, bridges, offshore wind power in the sea, rivers, etc. In more detail, it is possible to install in detail after pre-assembly, can be installed while reducing the field work, and also can be installed while responding flexibly to irregular underwater ground construction of large-diameter casing type and its preferred construction method It is about.

In order to stably build underwater structures such as dams, bridges, and offshore wind powers in the sea, rivers, etc., stable foundation construction must be preceded. Underwater ground foundation works by digging underwater ground and constructing monopile, etc., before the excavation of underwater ground, preventing soft soil or water from entering the foundation construction area or preventing the underwater ground from collapsing. For the purpose of preventing, it is necessary to install temporary structures in the form of large diameter casings in the foundation construction area. The construction method of such a temporary structure is a method of constructing a large-diameter casing steel pipe (large-diameter steel pipe type).

Large-diameter steel pipe is a method of manufacturing large-diameter casing steel pipe with steel materials around the factory or construction site and then bringing it to the construction site and sinking it in the water. This method has the advantage of reducing on-site work, but requires large equipment for transporting and lifting large casing steel pipes, and requires preliminary stabilization work for underwater grounds in order to stably install and install casing steel pipes on underwater grounds. There are disadvantages. In addition, when the underwater soil is very irregularly developed, such as the exposed rock or the very thin soil layer, the casing steel pipe does not respond flexibly to the underwater soil. It is not easy to prevent the phenomenon, and the problem that the excavation work becomes difficult is likely to occur.

The present invention was developed to improve the shortcomings of temporary structures by conventional large-diameter casing steel pipes in the foundation construction of underwater structures, which can be installed while pre-assembling to reduce the field work, and also flexible to irregular underwater grounds. There is a technical problem to provide a temporary structure of a large diameter casing form and a preferred construction method that can be installed while corresponding.

In order to solve the above technical problem, the present invention provides a large-diameter casing structure that is fixed and installed on the subsurface ground, and the large-diameter casing structure is completed by the structure to install the seat pile between the steel pipes and insert the center pile inside the steel pipes; In addition, the preferred method of construction provides a large-diameter casing construction method in which the steel pipe and sheet piles are pre-assembled and pre-assembled in a batch.

According to the present invention, the following effects can be expected.

First, since the sheet pile can be installed in a pre-assembled state, it is possible to perform underwater large-diameter casing construction with minimal field work. Therefore, it is possible to shorten the construction period and reduce the construction cost in connection with the basic construction of the underwater structure.

Second, there is little risk of construction errors because the large-diameter casing is installed by installing the seat pile and the steel pipe in the assembly state first and then installing the thumb pile inside the steel pipe of the assembly. Can improve the quality.

Third, even when the surface of the rigid layer (or rock layer) is very irregular on the seabed or the bottom, seat piles can be installed while responding to the irregular underwater ground. Therefore, when excavating the underwater ground inside the casing for foundation work, Soil disintegration can be prevented as much as possible.

1 and 2 are a plan view and a perspective view of the underwater large diameter casing temporary structure according to the present invention.

3 is a connection detail of the steel pipe and the sheet pile in the underwater large diameter casing temporary structure according to the present invention.

4 to 7 is a construction sequence diagram for the construction method of the underwater large diameter casing temporary structure according to the present invention.

8 to 10 is a construction sequence diagram showing a process of constructing an underwater structure while applying the construction method of the underwater large diameter casing temporary structure according to FIGS. 4 to 7, respectively, for mono-pile and bridge for offshore wind power The construction sequence of the bridge is shown.

The batch-mounted underwater large-diameter casing construction using the seat pile according to the present invention is a large-diameter casing structure that is fixed and installed on the underwater ground. A steel pipe seated on the floor; A seat pile provided with an engagement connector at an end thereof, the seat pile being installed to close one or more of the steel pipes, the seat pile being installed into the ground while being connected to the steel pipe through an engagement connector; A horizontal strut fixedly installed while horizontally connecting the steel pipes inside or outside the casing; And a center pile inserted into the steel pipe and fixed to the steel pipe while being inserted into the underwater ground.

The construction method of the underwater large diameter casing temporary structure according to the present invention is a method of constructing a batch-mounted underwater large diameter casing temporary structure using the above-mentioned sheet pile, while assembling the steel pipe, sheet pile, horizontal strut, the sheet pile is lower than the steel pipe Step S11 to assemble so as not to come; S12 step of bringing the assembly of step S11 into the construction site to seat the steel pipe on the water floor; Inserting and driving the center pile into the steel pipe; S14 step of fixing the center pile to the steel pipe; It characterized in that it comprises a; the step S15 step to install in the underwater ground by hitting the sheet pile.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments.

1 and 2 are a plan view and a perspective view of the underwater large diameter casing temporary structure according to the present invention. Underwater large-diameter casing is a temporary structure for the purpose of preventing the collapse or inflow of soil layers when excavating the ground for foundation construction in the process of constructing underwater structures such as dams, bridges, and offshore wind power in the sea, rivers, etc. The present invention is characterized in that the submerged large diameter casing is configured to include a steel pipe 10, a sheet pile 20, a horizontal strut 30, a center pile 50 as an assembly structure.

In the present invention, the steel pipe 10 is a hollow hollow member that is provided with an engagement connector 13 on the outer circumferential surface, and a plurality of engagement connectors 13 are disposed at predetermined intervals so as to face each other and installed on the bottom of the water. Such a steel pipe 10 serves as a guide pipe of the center pile 50 inserted into it.

In the present invention, the sheet pile 20 is a sheet-like pile member which is provided with an engaging connector 23 at the end and is engaged while being connected to each other, and is generally the same as a conventional sheet pile used for construction of an earth wall or a temporary barrier. . In other words, the sheet piles 20 are arranged to be engaged with each other and installed while hitting the ground. However, in the present invention, while the seat pile 20 is engaged with the steel pipe 10 through the engagement connection (13, 23) between the steel pipe 10 to form a casing of the closed structure together with the steel pipe 10 to the submarine ground. Is installed. The seat piles 20 are coupled to each other while being connected to the steel pipes 10 as well as the seat piles 20 so that the steel pipes 10 are closed by the sheet piles 20.

In the present invention, the horizontal strut 30 is configured to be fixed while horizontally connecting the steel pipes 10 inside or outside the casing. The plurality of steel pipes 10 are reinforced by horizontal struts 30 while being restrained as one. The horizontal strut 30 is preferably provided to include an external strut 31 that is continuously installed outside the casing for a stable reinforcement structure. The horizontal strut 30 is only fixed to the steel pipe 10, the sheet pile 20 is simply installed in contact. Thus, the steel pipe 10, the horizontal struts 30, and the sheet pile 20 may be installed in the underwater ground while hitting the sheet pile 20 even when assembled. Meanwhile, the horizontal strut 30 may be provided in parallel in multiple stages. In this case, the horizontal strut 30 may further be provided with a vertical strut 40 vertically connecting the multiple stage horizontal struts 30. The horizontal strut 30 and the vertical strut 40 may adopt an appropriate cross-sectional member in a conventional steel frame member such as an H-beam, a c-channel, an angle, etc. according to the structural design. And the vertical strut 40 provided with the c channel can be confirmed.

In the present invention, the center pile 50 is inserted into the steel pipe 10 is a configuration that is fixed to the steel pipe 10 while entering the ground. The center pile 50 is installed in the underwater ground together with the seat pile 20 to stably fix the casing temporary structure according to the present invention on the underwater ground. However, since the center pile 50 becomes a kind of thumb pile, it is preferable to install the root pile at a deeper depth than the seat pile 20 if possible. The center pile 50 preferably adopts a normal steel frame member such as H-shaped steel, but in FIG. 1, the center pile 50 provided with the H-shaped steel can be confirmed. On the other hand, the center pile 50 is fixed to the steel pipe 10, for this purpose it can be used as a coupler. However, considering that the underwater large diameter casing according to the present invention is a temporary structure to be immediately dismantled, it is preferable that the coupler is installed in a fixing method such as wedge type, bolt assembly type, etc., rather than fixing method such as welding.

By such a configuration, the underwater large-diameter casing temporary structure is completed. The casing of the closed structure is completed by the engagement coupling of the steel pipe 10 and the seat pile 20 and the stable construction state is maintained by the underwater ground fixing of the center pile 50 and the seat pile 20. Underwater large diameter casing construction according to the present invention can be completed in a closed structure of a circular or polygonal.

1 and 2 show a temporary structure of the casing type installed in a closed structure of a polygon. As shown, the steel pipe 10 is disposed to be located at the edge of the polygonal composition, and the sheet pile 20 is disposed to be located at the side of the polygonal composition to complete the polygonal closed structure. The closed structure of the polygon can be easily completed while the horizontal strut 30 is applied to the usual straight steel member as it is.

Furthermore, in FIGS. 1 and 2, horizontal struts 30 are provided as inner and

outer struts

31 and 32 and are installed in parallel while being spaced apart from each other inside and outside the casing, and between inner and

outer struts

31 and 32. The sheet pile 20 is provided in contact with each other. The installation structure of the horizontal struts 30 secures a stable reinforcement structure by the internal and

external struts

31 and 32, and maintains the verticality of the sheet piles 20 during the installation of the sheet piles 20. It is advantageous to.

3 shows the connection details of the steel pipe 10 and the seat pile 20 in the underwater large diameter casing temporary structure according to the present invention. In FIG. 3, a conventional steel pipe is appropriately modified to be provided as a steel pipe 10, specifically, a steel pipe main body 11; Wing sheet 12 welded to the outer peripheral surface of the steel pipe body (11); And an engagement connector 13 formed by bending an end portion of the wing sheet 12. In other words, by dividing the sheet pile 20 in half and joining both sides of the steel pipe main body 11, the steel pipe 10 provided with the engagement connector 13 is completed. These steel pipes 10 are simply installed while being engaged with the seat pile 20.

4 to 7 is a construction procedure for the construction method of the underwater large diameter casing temporary structure according to the present invention, illustrating a method of constructing the underwater large diameter casing temporary structure of Figures 1 and 2. It looks at the construction method of underwater large diameter casing temporary construction according to the present invention.

First, the steel pipe 10, the sheet pile 20, the horizontal struts 30 are assembled, and when the vertical struts 40 are further installed, the vertical struts 40 are also assembled (S11, FIG. 4). Sheet pile 20 is preferably the same as the steel pipe 10 or longer length than the steel pipe 10 and preferably assembled so as not to descend below the steel pipe 10, which is not disturbed by the sheet pile 20 This is to install the steel pipe (10) on the bottom of the stable installation.

Next, the assembly assembled in step S11 is carried into the construction site, and the steel pipe 10 is seated and installed on the underwater floor (step S12, FIG. 5). It is installed while lifting with a crane, and after installation, it is held by the assembly so that it does not move.

Next, the center pile 50, such as H-shaped steel, is inserted into the steel pipe 10, and installed in the underwater ground (S13, FIG. 6), and the center pile 50 is fixed to the steel pipe 10 ( Step S14), the seat pile 20 is driven and installed in the underwater ground (Step S15 (Fig. 7).

This completes the construction of underwater large diameter casing temporary structure. In the construction site, it is only necessary to carry out the arrangement work of the pre-assembled assembly, the insert driving of the center pile 50 and the driving of the seat pile 20, so that the construction work can be performed quickly while reducing the amount of field work. .

8 to 10 is a construction flowchart showing a process of constructing an underwater structure while applying the construction method of the underwater large diameter casing temporary structure according to FIGS. 4 to 7, a mono-pile for offshore wind power and a bridge for bridges The construction sequence is shown.

8 and 9 show the construction sequence of the monopile (MP). First, construct a large underwater casing temporary construction at the construction location (Fig. 8), the construction method is the same as in Figures 4 to 7 discussed above. Then, the excavation device is inserted into the casing temporary structure, and fixed to the top of the jackup barge (jackup barge), and then the excavating device is connected to the excavating base machine to excavate the casing temporary structure (FIG. 9 (a)). At this time, the excavating water and the rock piece can be discharged through the drill pipe while supplying the excavating water inside the casing temporary structure in a reverse circulation method. Next, the monofilament (MP) is inserted into the excavation hole (Fig. 9 (b)), and then grouted (G) between the monofilament and the excavation hole with concrete, mortar, and various fillers (Fig. 9 (c)). ), The casing temporary structure is removed (FIG. 9 (d)). Dismantling can be done in the reverse way of installation. In other words, the sheet pile 20 is first drawn out of the underwater ground, and then the center pile 50 is released and drawn out of the underwater ground and then drawn out of the steel pipe 10 and then removed, and then the steel pipe 10 and the sheet. The pile 20 and the horizontal strut 30 are conveyed by lifting the assembly in an assembled state. This completes the construction of underwater structures such as monopile.

10 shows the construction sequence of the underwater piers. For the construction of underwater piers, first, construct a large underwater diameter casing construction at the construction location as shown in FIG. Subsequently, the pumping work is carried out inside the casing temporary structure using a pumping pump (FIG. 10 (a)), and when the underwater ground is exposed inside the casing temporary structure, the piers foundation (P1) and the pier body (P2) are constructed on the underwater ground. (FIG. 10 (b) (c)). Next, after the water is put into the casing temporary structure (Fig. 10 (d)), the casing temporary structure is removed (Fig. 10 (e)). At this time, the dismantling of the temporary structure is the same as in the monofiling process. This completes the construction of underwater structures such as bridge piers.

The present invention has been described in detail above with reference to specific embodiments, but the embodiments are only for illustrating the present invention, and thus the embodiments substituted, added, and modified within the scope without departing from the spirit of the present invention are also described below. It will be said to belong to the protection scope of the present invention as defined by the claims appended hereto.

Claims

As a large diameter casing structure fixed in the underwater ground,

A steel pipe member provided with an engaging connector 13 on an outer circumferential surface thereof, the plurality of engaging pipes 13 being disposed at predetermined intervals so as to face each other, the steel pipe 10 being installed on the bottom of the water;

The seat pile 20 is provided with an engaging connector 23 at the end, one or more are installed to close between the steel pipe 10, while being engaged and connected to the steel pipe 10 through the engaging connector (13, 23) Seat pile 20 is installed until the root;

A horizontal strut 30 fixedly installed while horizontally connecting the steel pipes 10 inside or outside the casing;

A center pile 50 inserted into the steel pipe 10 and fixed to the steel pipe 10 while being inserted into the underwater ground;

Bulk installation type underwater large diameter casing temporary structure using a sheet pile, characterized in that comprising a.
In claim 1,

The horizontal strut 30,

An outer strut 31 installed to be located outside the casing; and an inner strut 32 installed to be positioned inside the casing; wherein the inner and outer struts 31 and 32 are spaced apart from each other and arranged in parallel. ,

The sheet pile (20) is installed in bulk contact type underwater large diameter casing construction using a sheet pile, characterized in that installed in contact with the inner and outer struts (31, 32).
The method of claim 1 or 2,

The steel pipe 10, the steel pipe body 11; Wing sheet 12 welded to the outer peripheral surface of the steel pipe body (11); Batch-mounted underwater large-diameter casing temporary structure using a sheet pile, characterized in that it comprises a;
The method of claim 1 or 2,

The steel pipe 10 is disposed to be located at the corner of the polygonal composition,

The sheet pile 20 is disposed so as to be located on the sides of the polygonal composition while connecting the steel pipes 10,

The horizontal strut 30 is a batch installation type underwater large-diameter casing temporary structure using a sheet pile, characterized in that configured to include an outer strut 31 is installed as a polygonal composition while surrounding the outside of the steel pipe (10).
The method of claim 1 or 2,

The center pile 50 is a batch installation type underwater large diameter casing temporary structure using a sheet pile, characterized in that the H-shaped steel.
A method of constructing a batch-mounted underwater large-diameter casing temporary structure using a sheet pile according to claim 1 or 2,

S11 step of assembling the steel pipe 10, the sheet pile 20, the horizontal struts 30, the sheet pile 20 is not lowered than the steel pipe 10;

Step S12 of bringing the assembly of step S11 into the construction site to seat the steel pipe 10 on the underwater floor;

Inserting and driving the center pile 50 into the steel pipe 10;

Step S14 of fixing the center pile 50 to the steel pipe 10;

A step S15 of driving the seat pile 20 in the ground;

Construction method of underwater large diameter casing temporary construction comprising a.