KR20140055059A - Submerged tunnel module structure and construction method thereof using concrete filled column with double steel - Google Patents

Abstract

An undersea tunnel modular structure using the cross section of a double steel pipe filled with concrete includes a undersea tunnel module comprising an inner tube part; an outer tube part greater than the diameter of the inner tube part; a concrete part formed between the inner tube part and the outer tube part and having a length shorter than the length of the inner tube part and the outer tube part in order to form a clearance on both ends of the inner tube part and the outer tube part; a joint space formed by the outer circumference of the inner tube part, the inner circumference of the outer tube part, and the end of the concrete part; and mortar filled in the joint space.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a submerged tunnel module structure,

The present invention relates to a structure of an underwater tunnel module using a concrete filled double steel pipe cross section and a method of constructing the same. More specifically, the present invention provides a cross section having excellent strength by restricting an inner concrete portion by an inner pipe portion and an outer pipe portion, And assembling by modularization. However, since it is possible to apply the method of applying the prestressing after the entire assembly by joining between the modules, it is possible to provide an easy construction and a rigid and watertight joint, The present invention relates to a structure of an underwater tunnel module using a concrete filled double steel pipe section capable of being efficiently fixed by a tension leg while controlling the structure of the tunnel.

Generally, under the geographical conditions such as the sea on three sides like Korea, it is necessary to construct bridges connecting land, land and island. In order to construct such bridges, not only the construction cost is high but also the construction period is quite long It takes time.

Underground tunnels are proposed as an alternative structure for bridges, and many techniques for underwater tunnels are being studied. Until now, the cross section applied to the underwater tunnel has been mainly composed of the reinforced concrete section in which the hollow is formed. Such a reinforced concrete section has high permeability, so if it is applied to the underwater tunnel, any structure for blocking the leakage should be proposed do. Also, in case of reinforced concrete section where hollow is structurally constructed, reliability of performance is not good and it is not applied to the substructure of bridges located in the sea.

In order to compensate for these drawbacks, Korean Patent Registration No. 0892134 is proposed. In this technique, a block used in constructing an underwater tunnel comprises an intermediate pipe between an inner pipe and an outer pipe, A main body which is formed in the form of multiple tubes by a synthetic resin material so that several diaphragms are formed between the middle tubes and between the middle tubes and the outside tubes; A weight applying part formed by injecting concrete between the inner tube and the middle tube so as to have a weight; And a buoyancy applying unit configured to apply buoyancy by injecting or exhausting air between the intermediate tube and the outer tube.

Although the above-described technique has proposed a structure for improving the watertightness by the inner tube and the outer tube, any structure for preventing leakage at the junction between the respective blocks is small, and the whole of the connection between the blocks is prestressed There is a problem in that the prestressing operation is not easy in the water due to the assembly, and the fixing force of the nuts and the like of the fusing unit is weakened due to the multi-stage prestressing at the joint between the respective blocks by the entire prestressing,

Korea Patent No. 0892134

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide an underwater tunnel structure in which an assembly structure is presented between modules constituting an underwater tunnel, And to provide an underwater tunnel module structure and a method of constructing the tunnel module structure in which the overall structural stability can be achieved.

An underwater tunnel module structure using a concrete filled dual steel pipe section of the present invention comprises: An outer tube portion having a diameter larger than the diameter of the inner tube portion; A concrete portion formed between the inner tube portion and the outer tube portion and formed to have a length smaller than the length of the inner tube portion and the outer tube portion and to form a clearance at both ends of the inner tube portion and the outer tube portion; A joint space formed by an outer periphery of the inner pipe portion, an inner periphery of the outer pipe portion and an end portion of the concrete portion; And a mortar which is filled in the joint space.

Here, the concrete filled double steel pipe cross section is defined as a cross section of a structure including a double pipe formed by the inner pipe portion and the outer pipe portion and a concrete portion filled between the double pipe.

In addition, in the present invention, a plate-shaped internal stiffener adhered to the joint portion between the inner tube portions and a plate-shaped external stiffener attached to the joint portion between the outer tube portions are further formed as a joint portion between the underwater tunnel modules for reinforcing the joint portions between modules.

It is proper that the outer portion constituting the joint space is formed with an injection hole filled with the mortar and the outer reinforcement is formed with a second injection hole communicating with the injection hole.

In addition, it is preferable that a plurality of projecting tension bars are formed on both ends of the concrete portion to improve the adhesion strength and the tensile strength.

A tensioning leg is mounted on the upper portion of the external reinforcement member and the tensioning leg is configured to be narrowed from the lower end to the upper end so that the tensioning leg mounting means is configured by the structure of the external reinforcement member without means for mounting a separate tensioning leg. It is reasonable.

The method for constructing the underwater tunnel module structure using the concrete filled dual steel pipe cross section according to the present invention comprises: An outer tube portion having a diameter larger than the diameter of the inner tube portion; A concrete portion formed between the inner tube portion and the outer tube portion and formed to have a length smaller than the length of the inner tube portion and the outer tube portion and to form a clearance at both ends of the inner tube portion and the outer tube portion; A joint space formed by an outer periphery of the inner pipe portion, an inner periphery of the outer pipe portion, and an end portion of the concrete portion; welding between underwater tunnel modules; Attaching a plate-shaped internal stiffener attached to a joint portion between the inner tube portions and an external stiffener attached to a joint portion between the outer tube portions, at a joint portion between the underwater tunnel modules; Filling the joint space with mortar; And attaching a tension leg to a tensioning leg guide having a shape narrowed from a lower end to an upper end on the upper portion of the external reinforcement member and fixing the tension leg to the seabed.

The present invention has the following effects.

First, by restricting the concrete part constituting the underwater tunnel module to the inner tube part and the outer part part, the 3-axis compressive load state is formed, thereby improving the rigidity against the bending moment. Accordingly, the cross section and self weight are reduced, There is an effect.

Second, the joint structure of the underwater tunnel modules is assembled by mortar filling, internal reinforcement and external reinforcement, and a rigid and watertight joint structure is proposed. By joining the joints between each underwater tunnel module without additional prestressing, , Separation of joints by the entire prestressing, and the like can be controlled.

Third, in the connection of underwater tunnel modules, mortar is filled after welding of inner pipe, outer pipe, internal stiffener and external stiffener to control the decrease of joint strength according to the change of concrete properties by welding heat.

1 is a perspective view showing an underwater tunnel module in an underwater tunnel module structure using a concrete filled dual steel pipe section according to the present invention,
FIGS. 2A to 2C are cross-sectional views illustrating a process of connecting underwater tunnel modules by internal stiffeners and external stiffeners.
FIGS. 3A and 3B are a perspective view showing an embodiment of an underwater tunnel module in a structure of an underwater tunnel module using a concrete filled dual steel pipe cross section according to the present invention, and an incision sectional view showing a structure in which underwater tunnel modules are connected using the same,
FIGS. 4A and 4C are perspective views showing respective embodiments of a case where a tension leg guide is formed on an external stiffener. FIG.

Hereinafter, the structure of the present invention will be described in detail by way of examples with reference to FIGS. 1 to 4C.

FIG. 1 is a perspective view showing an underwater tunnel module in a structure of an underwater tunnel module using a concrete filled dual steel pipe section according to the present invention. FIGS. 2a to 2c show a process of connecting underwater tunnel modules by an inner reinforcement and an outer reinforcement 3A and 3B are a perspective view showing an embodiment of an underwater tunnel module in a structure of an underwater tunnel module using a concrete filled dual steel pipe cross section according to the present invention and an incision sectional view showing a structure in which underwater tunnel modules are connected using the same And FIGS. 4A and 4C are perspective views showing respective embodiments of the case where the external stiffener is provided with a tension leg guide.

The underwater tunnel module structure using the concrete filled dual steel pipe cross section according to the present invention includes an internal stiffener 200 for reinforcing the joint between the underwater tunnel module 100 shown in FIG. 1 and the underwater tunnel module 100 shown in FIG. 2, And a reinforcing material (300).

1, the underwater tunnel module 100 includes an inner tube 110, an outer tube 120 larger than the inner tube 110, an inner tube 110 and the outer tube 120, And a length of the inner tube portion 110 and the outer tube portion 120 is shorter than a length of the inner tube portion 110 and the outer tube portion 120 to form a clearance at both ends of the inner tube portion 110 and the outer tube portion 120. [ A joint space 140 formed by the outer circumference of the inner tubular part 110, the inner circumference of the outer tubular part 120 and the end of the concrete part 130, And a mortar 150 to be filled (shown in Fig. 2C).

The underwater tunnel module 100 is installed in the sea, and the submarine tunnel module 100 is assembled to complete an underwater tunnel.

The inner tube portion 110 and the outer tube portion 120 may be made of steel to ensure rigidity against a bending moment. In some cases, in order to improve resistance to corrosive environments in the sea, Can be processed. Although the inner tube 110 and the outer tube 120 are formed in a circular tube shape in the drawing, it is obvious that the inner tube 110 and the outer tube 120 may have various shapes such as a rectangular tube and the like.

The inner tube portion 110 and the outer tube portion 120 constituting the underwater tunnel module 100 are not shown in the drawing but can be fixed by a support or the like. Since the underwater tunnel module structure is constructed in the sea, it is preferable that the underwater tunnel module 100 is made into a pra cast, and the underwater tunnel tunnel is constructed by assembling the underwater tunnel after the completion by the factory. The concrete part 130 may be formed by placing the concrete between the inner pipe part 110 and the outer pipe part 120 after using the outer pipe part 110 and the outer pipe part 120 as a mold.

In the underwater tunnel module 100 having such a structure, the inner tube portion 110 and the outer tube portion 120 constrain the concrete portion 130, so that the concrete portion 130 is under a three-axis compressive load. In this way, the rigidity against the bending moment can be reinforced, and the concrete portion 130 can form a hollow by the inner tube portion 110, thereby reducing the weight of the concrete portion 130, thereby facilitating the construction and reducing the material cost.

Particularly, the concrete portion 130 is formed to have a length smaller than the length of the inner tube portion 110 and the outer tube portion 120 to form a gap at both ends of the inner tube portion 110 and the outer tube portion 120. . By forming the concrete portion 130 in this way, a joint space 140 formed by the outer circumference of the inner tube portion 110, the inner circumference of the outer tube portion 120 and the end portion of the concrete portion 130 is formed .

The reason why the joint space 140 is formed as described above is to fill the joint space 140 with the mortar 150 when the underwater tunnel modules 100 are joined, When the joint portion of the inner tube portion 110 and the outer tube portion 120 constituted by the same length as the tube portion 110 and the outer tube portion 120 is welded, the joint portion is welded to the concrete portion 130, The inner tube portion 110 and the outer tube portion 120 are welded together after the welding is performed to prevent the durability and the rigidity of the inner tube portion 110 and the outer tube portion 120, 140 to fill the mortar 150 to prevent the concrete of the joint portion from being lowered in rigidity due to heat, thereby providing a solid joint. As the joint space 140 is formed, mutual joint spaces 140 are connected between the adjacent underwater tunnel modules 100 and the mortar 150 is filled in the joint space 140. Thus, 100), it is possible to solve the problem of leakage.

In the present invention, the plate-shaped internal stiffener 200 attached to the joint between the inner tube portions 110 for reinforcing the joint between the underwater tunnel modules 100, and the plate-like external stiffener attached to the joint portion between the outer tube portions 120 (300).

The internal stiffener 200 and the external stiffener 300 are formed in a circular plate shape and have a circular shape due to the shape of the inner tube portion 110 and the outer tube portion 120, ) Joints. The inner stiffener 200 and the outer stiffener 300 are also made of steel and are welded to the inner pipe 110 and the outer pipe 120, respectively. The internal stiffener 200 and the external stiffener 300 are configured to improve the strength of the joint between the underwater tunnel modules 100. The watertightness of the joint between the underwater tunnel modules 100 .

The external space 120 constituting the joint space is formed with an injection hole 121 through which the mortar 150 is filled and a second injection hole 121 communicating with the injection hole 121 is formed in the external reinforcement 300. [ (310) is formed. The welded portion a of the inner tube 110 and the outer tube portion 120 and the inner tube portion 110 of the inner stiffener 200 and the outer stiffener 300 are welded to each other at the joint between the underwater tunnel modules 100. [ And the mortar 150 is filled through the injection hole 121 and the second injection hole 310 after the welding process is completed for the outer pipe 120, The mortar 150 is filled in the joint space 140 between the underwater tunnel modules 100 and tightly adheres tightly between the underwater tunnel modules 100. As mentioned above, Thereby making it possible to prevent changes in the physical properties of the concrete by welding heat.

4A to 4C illustrate embodiments of the external stiffener 300. In the present exemplary embodiment, a tension leg guide 320 is formed on the external stiffener 300, As shown in FIG. 4A or the like, is formed in a semicircular shape in a shape narrowing from the lower end to the upper end, and is formed on the outer stiffener 300. The tension leg guide 320 may be integrally formed on the upper portion of the external stiffener 300 or separately manufactured and attached to the external stiffener 300. The external stiffener 300 may be installed to join the underwater tunnel modules 100 The tension leg guide 320 is configured to be interlocked.

The tension leg guide 320 is characterized by its shape. The first end of the tension leg guide 320 is formed in such a shape that its end face narrows from the lower end to the upper end. The second end of the tension leg guide 320 is formed in a semicircular shape, And has a shape that wraps the junction at the top.

The reason why the tension leg guide 320 is configured to narrow from the lower end to the upper end in constituting the cross section is that when the underwater tunnel is fixed to the seabed while applying the prestressing by the tension leg, The tension of the tension leg 320 may be narrowed from the lower end to the upper end of the tension leg 320. As a result, So that the generated stress is mitigated and transmitted to the underwater tunnel.

The reason why the tension leg guide 320 is formed in a semicircular shape so as to surround the joint portion between the underwater tunnel modules 100 is that the tension leg guide 320 is formed by the prestress applied to the tension leg As the joint between the underwater tunnel modules 100 is pressed through the external reinforcement 300, the joint between the underwater tunnel modules 100 is more tightly and firmly fixed by the external reinforcements 300.

4A to 4C, there is a difference in the structure in which the tension leg 400 is mounted on the tension leg guide 320. First, in the embodiment shown in FIG. 4A, the tension leg guide 320 And the tensioning leg 400 is attached to the through hole 321a. The embodiment shown in FIG. 4B is an example in which the tensioning leg 400 is attached to the through- The mounting groove 321b is formed on the upper surface of the mounting groove 321b and the tension leg 400 is placed on the mounting groove 321b to be prestressed and mounted on the bottom surface. The mounting groove 321c is formed on the tension leg guide 320 as in the embodiment shown in FIGS. 4A and 4B. In addition, the mounting groove 321c is formed with a fastening ring 322b, The groove 321c and the fastening ring 322b are provided with the tension legs 400) is mounted on the bottom surface in a state where prestressing is applied.

Meanwhile, the present invention proposes a method of constructing an underwater tunnel module structure using a concrete filled dual steel pipe section.

First, as shown in FIG. 2A, the construction method of the present invention includes an outer pipe portion having a diameter larger than that of the inner pipe portion; A concrete portion formed between the inner tube portion and the outer tube portion and formed to have a length smaller than the length of the inner tube portion and the outer tube portion and to form a clearance at both ends of the inner tube portion and the outer tube portion; And a joint space formed by an outer periphery of the inner pipe portion, an inner periphery of the outer pipe portion and an end portion of the concrete portion (S10). As shown in FIG. 2A, the inner tube 110 and the outer tube 120 are welded (a) to each other at the joints in a state where end portions of the underwater tunnel modules 100 are connected to each other. The structure of the underwater tunnel module 100 is the same as that described above, and a description thereof will be omitted.

Next, as shown in FIG. 2B, a step (S20) of attaching a plate-shaped internal stiffener attached to the joint portion between the inner tube portions and an external stiffener attached to the joint portion between the outer tube portions is attached to the joint portion between the underwater tunnel modules.

The inner stiffener 200 and the outer stiffener 300 are welded to each other so as to surround the joint between the inner tube 110 and the outer tube 120.

Next, as shown in FIG. 2C, there is a step (S30) of filling the joint space with mortar. In this step, the welding (a) of the inner tube 110 and the outer tube 120, the inner tube 110 of the inner stiffener 200 and the inner stiffener 300 of the outer stiffener 300, The mortar 150 is installed in the joint space 140 formed in the underwater tunnel module 100 and connected to each other at the joint between the underwater tunnel modules 100 in a state of being doubly attached to the outer shell part 120 by welding b. ), So that they are attached in triplicate. The reason for delaying the filling of the mortar 150 in this way is to prevent the strength of the joint portion from decreasing due to deterioration of the physical properties of the concrete due to the welding (a, b).

Finally, a tensioning leg 400 is attached to the upper portion of the external stiffener 300 so as to be narrowed from the lower end to the upper end, and the tension leg 400 is fixed to the seabed.

2A to 2C illustrate an example in which the external stiffener 300 is not provided with the tension leg guide 320. In this case, however, the tension leg 400 may be separately installed to apply the prestress to the tension leg 400 When the tension leg guide 320 is formed on the external stiffener 300 as shown in FIG. 4A or the like, the external stiffener 300 is fixed to the joint between the underwater tunnel modules 100 in step S20, And the tension leg guide 320 is configured. That is, the ease of construction is promoted.

When the tension leg guide 320 is formed on the external stiffener 300 as described above, the tension tunnel 400 is attached to the tension leg guide 320 and the prestressing is applied to fix the underwater tunnel module 100 to the undersurface . In this step, the underwater tunnel module 100 is fixed to the sea floor and compressive force is applied to the horseshoe-shaped tension leg guide 320, so that the external stiffener 300 is connected to the joint between the underwater tunnel modules 100 Tight and watertight bonding structure is provided.

In the meantime, as shown in FIGS. 3A and 3B, the present invention provides an example in which a plurality of protruding tension bars 131 are formed at both ends of the concrete part 130. The tensile bars 131 are exposed to the joint space 140 so that the underwater tunnel modules 100 are welded to fill the adjacent joint spaces 140 with the mortar 150. In this case, The tensile bars 131 increase the bond strength and the tensile strength also improves so that a firm joint is provided.

The tensile bars 131 may have various shapes, but in FIGS. 3A and 3B, the tensile bars 131 having a "C" shape are shown.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, . Accordingly, the technical scope of the present invention should not be limited to the details described in the specification, but should be defined by the claims.

100: underwater tunnel module 110: inner tube
120: Outer part 130: Concrete part
140: bonding space 150: mortar
200: internal stiffener 300: external stiffener
320: Tensen leg guide

Claims (6)

Inner tube;
An outer tube portion having a diameter larger than the diameter of the inner tube portion;
A concrete portion formed between the inner tube portion and the outer tube portion and formed to have a length smaller than the length of the inner tube portion and the outer tube portion and to form a clearance at both ends of the inner tube portion and the outer tube portion;
A joint space formed by an outer periphery of the inner pipe portion, an inner periphery of the outer pipe portion and an end portion of the concrete portion;
A mortar filled in the joint space;
Wherein the underwater tunnel module is constructed from a concrete filled double steel pipe section.
The method according to claim 1,
Wherein a plate-shaped internal stiffener attached to the joint portion between the inner tube portions and an external stiffener attached to the joint portion between the outer tube portions are further provided as a joint portion between the underwater tunnel modules, and a structure of the underwater tunnel module using the concrete filled dual steel pipe section.
3. The method of claim 2,
And a second injection hole communicating with the injection hole is formed in the outer reinforcement member. The structure of the underwater tunnel module using the concrete filled dual steel pipe cross section is characterized in that the outer pipe portion constituting the joint space is constituted by an injection hole filled with the mortar.
The method according to claim 1,
Wherein a plurality of projecting tension bars are formed at both ends of the concrete part.
3. The method of claim 2,
Wherein a tensioning leg is mounted on an upper portion of the external stiffener and a tension leg guide having a shape narrowing from a lower end to an upper end is formed.
Inner tube; An outer tube portion having a diameter larger than the diameter of the inner tube portion; A concrete portion formed between the inner tube portion and the outer tube portion and formed to have a length smaller than the length of the inner tube portion and the outer tube portion and to form a clearance at both ends of the inner tube portion and the outer tube portion; A joint space formed by an outer periphery of the inner pipe portion, an inner periphery of the outer pipe portion, and an end portion of the concrete portion; welding between underwater tunnel modules;
Attaching a plate-shaped internal stiffener attached to a joint portion between the inner tube portions and an external stiffener attached to a joint portion between the outer tube portions, at a joint portion between the underwater tunnel modules;
Filling the joint space with mortar;
Attaching a tension leg to an upper portion of the external stiffener and fixing the tension leg to the seabed portion of the tension leg guide in a shape narrowing from a lower end to an upper end;
The method for constructing an underwater tunnel module structure using a concrete filled dual steel pipe section is disclosed.

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