KR102336874B1 - Constructing Method of Underwater Tunnel with Tethering Tunnel Modules, and Underwater Tunnel Constructed by such Method - Google Patents

Abstract

The present invention builds an underwater tunnel by immersing and combining precast tunnel modules made of precast concrete sequentially to the correct position in the water using a finishing block and a guide chain, and stably tethering and fixing them at a fixed position. It relates to "underwater tunnel construction method of immersion and tethering configuration of precast tunnel module using closing block and guide cable" and "underwater tunnel" constructed by this construction method.

Description

Constructing Method of Underwater Tunnel with Tethering Tunnel Modules, and Underwater Tunnel Constructed by such Method}

The present invention relates to a method of constructing a tunnel through which vehicles or pedestrians can pass underwater, and an underwater tunnel constructed by such a construction method, and specifically, a tunnel module made of a precast concrete member (“precast tunnel”). By tethering the module") by sequentially submerging it to the correct position in the water using a closing block and guide chain, the precast tunnel module is watertightly and stably fixed at a fixed position to build an underwater tunnel. It relates to an underwater tunnel construction method of immersion and tethering configuration of a precast precast tunnel module using blocks and guide chains, and an “underwater tunnel” constructed by such a construction method.

In constructing an underwater tunnel to be built in water for the passage of vehicles or pedestrians, the method of sequentially extruding the tunnel module constituting the underwater tunnel from one side of the underwater tunnel to the front (the direction in which the underwater tunnel proceeds) is the Republic of Korea Patent No. 10 -0797795 et al. As an alternative to this, recently, a precast tunnel module pre-fabricated in the form of a precast concrete structure in a factory is floated on the water surface and transported to the site, and then the precast tunnel module is immersed in the water to install the already installed underwater tunnel. A method of constructing an underwater tunnel by continuously combining precast tunnel modules in a way that connects to the parts has been proposed.

In the case of an underwater tunnel, it is common that the acting buoyancy force is greater than the self-weight of the underwater tunnel, so it is very important to stably fix it in the water so that the underwater tunnel does not float. In general, the position of the underwater tunnel is fixed by connecting the body of the underwater tunnel and the underwater ground using a fixed cable at a predetermined interval in the direction in which the underwater tunnel extends, that is, in the longitudinal direction. In this way, stably fixing the underwater tunnel using a fixed cable is called “tethering”. In the related art, whenever a precast tunnel module is submerged in water and joined to an existing part, a diving manpower is input to perform tethering in such a way that a fixed cable is coupled to the precast tunnel module. However, since the underwater tunnel is built at a considerable depth of water, the input of diving personnel for tethering not only causes considerable work time and cost, but also has the disadvantage of increasing the possibility of a safety accident.

The precast tunnel module should be connected to the existing part with high precision. However, in the prior art, the task of immersing the precast tunnel module underwater, arranging and arranging it at the correct connection position also depends on the diving manpower. exist.

Republic of Korea Patent Publication No. 10-0797795 (published on Jan. 24, 2008)

The present invention was developed to overcome the limitations of the prior art as described above, and by immersing a precast tunnel module that was floated and transported to the site, connected to the existing part of the underwater tunnel, and tethered using a fixed cable to form an underwater tunnel. In construction, the precast tunnel module is guided and aligned to the correct connection joint position using a guide chain, and at the same time, the precast tunnel module is immersed and tethered at a fixed position using a closing block. Underwater tunnel construction technology that minimizes the input of diving manpower when performing the derring work, reduces costs, prolonged construction period, and the risk of safety accidents, enables precise construction by minimizing construction errors, and increases construction efficiency is intended to provide

In order to achieve the above object, in the present invention, the precast tunnel module is floated on the surface of the water, transported, and then submerged, connected and joined to the existing part already built in the water, and the subsequent precast tunnel module is sequentially joined continuously. As an underwater tunnel construction method that constructs an underwater tunnel through As an underwater tunnel construction method to construct an underwater tunnel by splicing, a fixed cable for tethering equipped with a finishing block is installed in front of the existing part at the top, a guide chain is connected to the finishing block, and the guide chain is used in a precast tunnel connecting to the module; immersing the precast tunnel module underwater by winding the guide chain to align and arrange the precast tunnel module at the joint position in front of the existing part; and tethering the precast tunnel module by means of a fixed cable by watertightly connecting the existing part and the precast tunnel module together, and fixing the finishing block to be integrated with the precast tunnel module in a watertight state. ; A concave groove is formed in the precast tunnel module, a bolt hole is formed in the concave groove, the upper end of the finishing block has a shape corresponding to the concave groove, and a coupling bolt is protruded from the upper surface of the finishing block, and a guide chain passes through the precast tunnel module and is wound on the chain winder inside the precast tunnel module; The guide chain is wound by the operation of the chain winder and the precast tunnel module is immersed, and when the precast tunnel module is aligned and placed in front of the existing part, the upper end of the finishing block is fitted so that it is in close contact with the inner surface of the concave groove and is watertight. Underwater, characterized in that the precast tunnel module is tethered by a fixed cable by fastening and fixing the nut member to the protruding coupling bolt, and the coupling bolt penetrates the bolt hole and protrudes into the inside of the precast tunnel module. A tunnel construction method is provided.

In addition, the present invention provides an underwater tunnel constructed and constructed by the above-described underwater tunnel construction method.

In the underwater tunnel and its construction method of the present invention, the fixed cable passes through the closing block and is combined with the closing block; A cable through hole into which a fixed cable is inserted is formed through the bottom surface of the concave groove; When the upper end of the closing block is fitted to the inner surface of the concave groove, the end of the fixed cable protrudes through the cable through hole into the inside of the precast tunnel module; Since the end of the fixed cable protruding into the inside of the precast tunnel module is tensioned and fixed, a tension force is introduced to the fixed cable. It may have a configuration in which it enters the inside of the precast tunnel module through the bolt hole.

In the present invention, in constructing an underwater tunnel by immersing the floating and transported precast tunnel module to the site and connecting it to the existing part of the underwater tunnel, until the precast tunnel module is put into the water and aligned in front of the existing part As it is immersed while being guided by the guide chain, the precast tunnel module can be easily aligned at the correct joint position without being lost due to currents, etc., and tethering of the precast tunnel module can be easily performed. No diving manpower is put in the immersion and tethering process of the tunnel module, or at least the input of diving manpower can be minimized. There are advantages to being.

In addition, in the present invention, the precast tunnel module is immersed to the bonding target position and joined to the existing part, the hole existing in the precast tunnel module is closed watertight by the closing block due to the guide chain, and at the same time, the precast tunnel module is attached to the fixed cable. Since it is tethered very firmly and stably, there is an advantage in that the effect of improving the construction efficiency and shortening the construction period is doubled.

In particular, in the present invention, in order to tether the precast tunnel module using a fixed cable, the operation of watertightly coupling and fixing the finishing block to the precast tunnel module can be performed inside the precast tunnel module, so the operation can be performed easily. This can be achieved and the effect of greatly improving the construction efficiency is exhibited.

1 to 3 are schematic side views sequentially showing the process of constructing an underwater tunnel according to the construction method according to the present invention, respectively.
4 and 5 are schematic longitudinal cross-sectional views of the precast tunnel module sequentially showing the process of connecting and coupling the upper end of the guide chain to the precast tunnel module, respectively.
6 and 7 are schematic side views sequentially showing that the precast tunnel module is submerged in water and joined at the front of the existing part, respectively.
8 is a schematic perspective view of a closing block provided on an upper portion of a fixed cable.
9 is a schematic front view of the closing block shown in FIG.
10 is a schematic perspective view of a precast tunnel module showing a concave groove to which a finishing block is coupled;
11(a) and 11(b) are partial cross-sectional views of a schematic precast tunnel module according to arrows EE and FF indicated in FIG. 10 in a concave groove, respectively.
12 is a schematic longitudinal cross-sectional view corresponding to FIG. 5 showing a state in which the finishing block is fixedly coupled to the precast tunnel module and the precast tunnel module is tethered by a fixed cable.
13 is a schematic partial cross-sectional view of the precast tunnel module corresponding to FIG. 11 (a) showing the coupling state of the closing block and the concave groove when the precast tunnel module is in a tethered state.
FIG. 14 is a schematic longitudinal cross-sectional view corresponding to FIG. 12 for an embodiment in which the precast tunnel module is tethered with fixed cables intersecting each other.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Although the present invention has been described with reference to the embodiment shown in the drawings, which is described as one embodiment, the technical idea of the present invention and its core configuration and operation are not limited thereby. For reference, in this specification, the direction in which the underwater tunnel extends is described as "longitudinal direction". In particular, the direction in which the underwater tunnel extends as the precast tunnel module is gradually joined to the underwater tunnel is described as "front", The opposite direction is described as "rear".

The underwater tunnel according to the present invention is constructed by integrally connecting the precast tunnel modules 2 having a predetermined length in the longitudinal direction sequentially from the front in a watertight state. 1 is a schematic side view showing a state in which the existing part 1 is installed in the water in the process of constructing an underwater tunnel according to the construction method according to the present invention. As shown in Figure 1, when constructing an underwater tunnel, the existing part (1) is installed to have a predetermined longitudinal underwater tunnel alignment, and the fixed cable (3) whose lower end is fixed to the underwater ground is the underwater tunnel. By being coupled to the existing part (1), the existing part (1) is tethered by a fixed cable (3). In front of the existing part (1), another fixed cable (3) for fixing the precast tunnel module (2) to be newly immersed is fixed to the underwater ground in accordance with the position where the precast tunnel module (2) is to be immersed and placed. has been A closing block 4 is provided at the upper end of the fixing cable 3 for fixing the newly immersed precast tunnel module 2 by tethering. In installing the closing block 4 on the fixed cable 3 , the fixed cable 3 may be in the form of penetrating the closing block 4 watertightly. In this case, after coupling the closing block 4 to the precast tunnel module 2 as described below, the length of the fixed cable 3 is adjusted inside the precast tunnel module 2 to be introduced into the fixed cable 3 . It becomes possible to perform the operation of adjusting the tension to be very easily.

A guide chain 5 is connected to the closing block 4, and as illustrated in FIG. 1, a first buoy 51 is coupled and installed on the upper end of the guide chain 5 so that the first buoy 51 floats on the water surface. can make it In this way, when the first buoy 51 is used, the upper position of the guide chain 5 can be easily grasped, and the upper end of the guide chain 5 can be made to exist near the water surface, so that as will be described later, the guide chain ( 5) has the advantage of being able to easily perform the operation of connecting the precast tunnel module 2 to the surface of the water.

If necessary, an auxiliary second buoy 52 may be further connected to the fixed cable 3 . Reference number 50 is a connecting line 50 for connecting the second buoy 52 and the fixed cable 3 . In the state before the guide chain 5 is connected to the precast tunnel module 2, the guide chain 5 may be in a dangling state, whereby the first buoy 51 coupled to the guide chain 5 is It may be out of a considerable range from the fixed position. In this case, if the operator recklessly relies on the first buoy 51 to transfer the precast tunnel module 2 to be newly immersed, it may lead to a wrong position. . However, if the auxiliary second buoy 52 is connected to the fixed cable 3 as above, the position of the fixed cable 3 can be grasped by the second buoy 52 , and the operator uses the second buoy 52 . Thus, it is possible to transport the precast tunnel module 2 to an accurate location. If necessary, the first buoy 51 and the second buoy 52 can be connected to each other, and in this case, the first buoy 51 can be effectively prevented from being excessively positioned in the wrong range.

The precast tunnel module 2 constituting the underwater tunnel is pre-fabricated as a precast concrete member on land or on a ship to have a hollow through which vehicles or people can pass, and is suspended on the water surface by a towing vessel. It is transferred to a place where the upper end of the guide chain 5 is located at the construction site. When the precast tunnel module (2) is transported to the construction site, the upper end of the guide chain (5) extending toward the water surface is connected to the precast tunnel module (2). 2 is a schematic side view showing a state in which the precast tunnel module 2 is transported to the construction site following the state shown in FIG. 1, and in FIG. A schematic side view showing a state in which the upper end is connected to the precast tunnel module 2 is shown. 4 and 5 are schematic longitudinal cross-sectional views of the precast tunnel module 2 sequentially showing the process of connecting and coupling the upper end of the guide chain 5 to the precast tunnel module 2, respectively.

As shown in the drawing, the fixed cable 3, the closing block 4, and the guide chain 5 are respectively installed on both sides of the left and right when the precast tunnel module 2 is viewed in the longitudinal direction, and the precast tunnel A chain winder (M) may be provided inside the hollow of the module (2). First, as shown in FIG. 4 , the other end of the guide wire 54 having one end wound around the chain winder M is pulled out of the precast tunnel module 2 and the upper end of the guide chain 5 is pulled out. connect to When the guide chain (5) is separated from the first buoy (51) and the chain winder (M) is operated to wind the guide wire (54), the guide wire (54) is guided while being wound by the chain winder (M). After the upper end of the chain 5 passes through the precast tunnel module 2, it is wound around the chain winder M as shown in FIG.

As illustrated in FIGS. 4 and 5, the cross section of the precast tunnel module 2 can be divided up and down, and the upper part is made watertight so that the precast tunnel module 2 can be easily submerged and dried. (乾式) to become a space and the lower part can be filled with water inflow, and in the embodiment shown in the figure, the chain winder (M) is arranged in the lower space filled with water. If necessary, the chain winder M may be located in the upper dry space.

When the guide chain 5 is further wound by operating the chain winder M in the state in which the guide chain 5 is wound as above, the length of the guide chain 5 is reduced as shown in FIG. 5 and the precast tunnel module (2) is submerged in water toward the joint position with the existing part (1). 6 is a schematic side view showing that the precast tunnel module 2 is submerged by the reduction in the length of the guide chain 5 following the state shown in FIG. A schematic side view is shown showing a state in which the cast tunnel module 2 is aligned and bonded at the bonding position in front of the existing part 1 . As shown in FIG. 7, after the precast tunnel module 2 is arranged in front of the existing part 1, the existing part 1 and the precast tunnel module 2 are watertightly integrally connected and coupled, Subsequently or in parallel, the finishing block 4 is fixedly coupled to the precast tunnel module 2 in a watertight state.

As the closing block 4 is firmly fixedly coupled to the precast tunnel module 2, the precast tunnel module 2 bonded to the existing part 1 is connected to the fixed cable 3 coupled to the closing block 4 It becomes a very stable tethered state. The precast tunnel module joined in this way is now a new existing part, and a new precast tunnel module is prepared again, immersed in the same way as above, and joined. By repeating the process of tethering the tunnel module with a fixed cable, an underwater tunnel is built.

In the present invention, as described above, the precast tunnel module 2 is immersed in the water to the joint target position and is guided by the guide chain 5 until it is aligned in front of the existing part 1 of the underwater tunnel, and it is safely immersed to the joint position. Therefore, the immersion operation of the precast tunnel module 2 is facilitated, and in particular, it is possible to prevent the precast tunnel module 2 from being lost due to currents, etc., and furthermore, the immersion process of the precast tunnel module 2 It is possible to minimize the input of diving manpower, or at least the input of diving manpower. Therefore, according to the present invention, it is possible to greatly reduce the cost required for immersion and tethering of the precast tunnel module 2, shorten the construction period, and also greatly reduce the risk of safety accidents. In particular, as the precast tunnel module 2 is immersed to the bonding target position and joined to the existing part 1 , the closing block 4 coupled to the fixed cable 3 is watertightly attached to the precast tunnel module 2 . Since the precast tunnel module (2) is tethered very securely and stably by the fixing cable (3) by being coupled and fixed, the effect of shortening the period of time is doubled.

Above all, in order to tether the precast tunnel module (2) using a fixed cable (3), the work of watertight coupling and fixing the closing block (4) to the precast tunnel module (2) is performed on the precast tunnel module (2) Since it can be carried out inside the As illustrated in FIGS. 4 and 5 , even when water is filled in the lower portion of the cross section of the precast tunnel module 2 , the precast tunnel module 2 is integrally connected to the existing part 1 in a watertight manner and then the precast tunnel module By artificially draining the water filled in (2), the inside of the precast tunnel module (2) can be made into a dry space. In this case, since the operation of watertight coupling and fixing of the finishing block 4 to the precast tunnel module 2 can be performed in the dry space inside the precast tunnel module 2, there is an advantage in that the efficiency of the operation is further maximized. .

Next, the detailed configuration of the closing block 4 and the configuration of tethering the submerged precast tunnel module 2 by watertight coupling and fixing the closing block 4 to the precast tunnel module 2 will be described in detail. .

8 is a schematic perspective view of the closing block 4 provided on the upper portion of the fixing cable 3 is shown, FIG. 9 is a schematic front view of the closing block 4 shown in FIG. 10 is a schematic perspective view of the precast tunnel module 2 showing the concave groove 20 to which the closing block 4 is coupled is shown. 11 (a) is a partial cross-sectional view of the schematic precast tunnel module 2 along the arrow EE shown in FIG. 10 in the concave groove 20, and in FIG. 11 (b) the concave groove 20. A schematic partial cross-sectional view of the precast tunnel module 2 is shown along the arrow FF, which is a direction orthogonal thereto.

As mentioned above, since the upper end of the guide chain 5 passes through the precast tunnel module 2 and is wound around the chain winder M, a hole through which the guide chain will pass is formed in the precast tunnel module 2 . However, in order to maintain a watertight dry space inside the underwater tunnel even at high water pressure, the hole formed in the precast tunnel module needs to be completely sealed. In addition, for stable tethering of the precast tunnel module 2 , the fixed cable 3 should be firmly coupled to the precast tunnel module 2 . The closing block 4 is a member provided at the upper end of the fixed cable 3 to exhibit all of the above functions, and the closing block 4 is assembled and coupled with its upper surface in close contact with the precast tunnel module 2 .

In the precast tunnel module (2), a concave groove (20) is formed in the portion to which the upper surface of the finishing block (4) is in close contact. As shown in the drawing, a portion of the thickness of the precast tunnel module 2 is reduced to form a concave groove 20 having a concave groove. Therefore, a part of the upper end of the closing block 4 is accurately fitted into the concave shape of the concave groove 20 to fill the concave groove 20, and the upper surface of the closing block 4 is on the flat bottom surface of the concave groove 20. become close In the case of the embodiment shown in the drawings, the concave groove 20 has a concave shape in the form of a polygonal truncated truncated cone that is composed of a flat bottom surface and an inclined surface surrounding the bottom surface so that the cross-sectional area becomes smaller as the thickness of the precast tunnel module increases. The bar, the upper part of the closing block 4 fitted into the concave groove 20 is also formed in a form having a flat front and an inclined side so that it is precisely matched thereto.

As mentioned above, the closing block 4 is provided at the upper end of the fixed cable 3, in the case of the embodiment of the drawing, the closing block 4 has a central through hole 42 formed therein, so the fixed cable 3 is a central pipe It is inserted into the through hole 42 and penetrates the closing block 4, and the end of the fixed cable 3 protruding out of the upper surface of the closing block 3 has a configuration in which the fastening finishing material 33 is coupled. Although not shown in the drawings, a stopper may be installed on the lower surface of the closing block 4 to prevent the closing block 4 from descending along the fixed cable 3 . When the closing block 4 is provided in the fixed cable 3 in such a way that the fixed cable 3 passes through the closing block 4, the fixed cable 3 is connected to the precast tunnel module 2 as described later. ), it is easy to fix the end by tensioning the inside, and accordingly, the advantage of being able to achieve the tethering of the precast tunnel module by the fixed cable 3 more firmly and stably is exhibited. In particular, this configuration has the advantage of being able to adjust the length of the fixed cable (3) when necessary. However, the method of coupling the closing block 4 to the fixed cable 3 is not limited to the above configuration, and various other methods such as welding or buried pressing may be used.

A coupling bolt 40 is integrally provided on the upper surface of the closing block 4 in a protruding form. A plurality of coupling bolts 40 may be provided. In addition, the closing block 4 is provided with a guide chain 5 for inducing the immersion of the precast tunnel module 2 is connected. 10 to 12, a bolt hole 22 through which the coupling bolt 40 is inserted is formed on the flat bottom surface of the concave groove 20 to which the upper surface of the finishing block 4 is in close contact, as shown in FIGS. When the lower end of the guide chain 5 is coupled to the end of the coupling bolt 40 as illustrated in, the bolt hole 22 can also be used as a hole through which the guide chain 5 passes, and accordingly, the guide chain (5) It is not necessary to separately form a hole through the precast tunnel module (2), it is possible to reduce the number of holes to be formed in the precast tunnel module (2). Of course, when the lower end of the guide chain 5 is coupled to an arbitrary position on the upper surface of the closing block 4 , a hole through which the guide chain 5 will pass is additionally formed through the concave groove 20 . A cable through hole 23 into which the fixed cable 3 is inserted is formed through the bottom surface of the concave groove 20 .

12 is a schematic longitudinal direction corresponding to FIG. 5 showing a state in which the closing block 4 is fixedly coupled to the precast tunnel module 2 and the precast tunnel module 2 is tethered by the fixed cable 3 . is shown, and FIG. 13 shows the coupling state of the closing block 4 and the concave groove 20 when the precast tunnel module 2 is tethered by the fixed cable 3 as described above. A partial cross-sectional view of the schematic precast tunnel module 2 corresponding to (a) of FIG. 11 is shown. 12 and 13, when the precast tunnel module 2 is tethered by the fixed cable 3, the closing block 4 is in close contact with the precast tunnel module 2, specifically, the finish The upper portion of the block (4) is located in the concave groove (20) and is completely in close contact. At this time, the coupling bolt 40 is inserted into the bolt hole 22 so as to penetrate the precast tunnel module 2 , and the end protrudes into the precast tunnel module 2 . The nut member 44 is fastened to the protruding coupling bolt 40 so as to be firmly fixed. The fixed cable 3 and the fastening finishing material 33 may be simply inserted into the cable through hole 23, but the end of the fixed cable 3 also passes through the cable through hole 23 and the precast tunnel module (2) may protrude into the When the fastening finish material 33 is temporarily coupled to the end of the fixed cable 3 protruding out of the upper surface of the closing block 4, the fastening finish material (3) when the fixed cable 3 is inserted into the cable through hole (23) 33) is also located in the cable through hole (23).

When the end of the fixed cable 3 passes through the cable through hole 23 and protrudes into the precast tunnel module 2, a simple fastening member 43 is fastened to the protruding end of the fixed cable 3 to fix it. It is also possible to fix the cable 3, but after pulling the end of the fixed cable 3 with a tension device, etc. It is also desirable In this way, when tension is introduced into the fixed cable 3 , the precast tunnel module 2 can be tethered more firmly and stably.

Above all, in the above configuration, the entire convex portion of the upper portion of the finishing block 4 is completely in close contact with the entire concave inner surface of the concave groove portion 20, and thus excellent watertightness is exhibited. In addition, the work of fastening the nut member 44 to the coupling bolt 40 described above, the work of fastening the fastening member 43 to the end of the fixed cable 3 or fixing the fixed cable 3 by tensioning the precast tunnel As it is performed inside the module (2), it is possible to avoid or at least minimize the input of diving personnel into the high-pressure environment outside the precast tunnel module (2), thereby reducing the risk of safety accidents and saving time and money. The advantages of being able to

FIG. 14 is a schematic longitudinal cross-sectional view corresponding to FIG. 12 for an embodiment in which the precast tunnel module 2 is tethered with the fixed cables 3 crossed with each other. In tethering the precast tunnel module 2 with the fixed cable 3, a pair of closing blocks 4 are coupled to both sides of the precast tunnel module 2 as shown in FIG. The pair of fixed cables 3 may be positioned on both sides of the precast tunnel module 2 without intersecting each other, but in contrast, as shown in FIG. 14 , the fixed cables 3 are installed in a crossed state, The cast tunnel module 2 can be tethered.

1: Existing part
2: Precast tunnel module
3: Fixed cable
4: Closing block
5: guide chain

Claims (4)

The precast tunnel module (2) is floated on the surface of the water, transported, and then submerged to connect to the existing part (1) that has already been built in the water, and the following precast tunnel modules are sequentially and successively joined to construct an underwater tunnel. As an underwater tunnel construction method,
A fixing cable for tethering (3) equipped with a closing block (4) at the top is installed in front of the existing part (1), and a guide chain (5) is connected to the closing block (4), and the guide chain (5) ), the first buoy 51 is coupled to the upper end of the buoy to make the first buoy 51 float on the water surface, and the connecting line 50 is also connected to the fixed cable 3, and the second buoy is auxiliary to the connecting line 50. connecting (52) to make the second buoy (52) also float on the water surface;
After floating the precast tunnel module 2 to the water surface and transporting it, the other end of the guide wire 54 wound around the chain winder M provided inside the precast tunnel module 2 is connected to the precast tunnel module. Pull out of (2), connect it to the upper end of the guide chain (5), separate the guide chain (5) from the first buoy (51), and pull the guide wire (54) by the operation of the chain winder (M) By reducing the length of the guide chain 5 by making the upper end of the guide chain 5 penetrate the precast tunnel module 2 and wound around the chain winder M, the precast tunnel module 2 is immersed in the water to make the existing aligning the abutment position at the front of the part (1); and
The precast tunnel module ( 2) tethering by means of a fixed cable (3);
The precast tunnel module (2) is provided with a concave groove (20) which is dug into a concave groove (20), a bolt hole (22) is formed in the concave groove (20), and the upper end of the closing block (4) is a concave groove (20). ) has a shape corresponding to, the upper surface of the closing block (4) is provided with a coupling bolt (40) protruding;
When the guide chain 5 is wound by the operation of the chain winder M and the precast tunnel module 2 is submerged and arranged in front of the existing part 1, the upper end of the closing block 4 is a concave groove part. It is fitted to the inner surface of the 20 to form a watertight state, and the coupling bolt 40 penetrates the bolt hole 22 and protrudes into the precast tunnel module 2, and is attached to the protruding coupling bolt 40. As the nut member 44 is fastened and fixed, the precast tunnel module 2 is tethered by the fixing cable 3 ;
The concave groove 20 is formed so that a part of the thickness of the precast tunnel module 2 is reduced and is dug concave. The concave groove 20 is composed of a flat bottom surface and an inclined surface surrounding the bottom surface. has a concave shape in the form of a polygonal truncated truncated cone whose cross-sectional area becomes smaller as the thickness increases;
The upper portion of the closing block 4 has a convex portion of a shape corresponding to the concave shape of the concave groove portion 20, so that the convex portion constituting the upper portion of the closing block 4 is fitted into the concave groove portion 20 and is in close contact with the inner surface. to fill the concave groove 20 in the form that becomes;
The fixing cable 3 passes through the closing block 4 and is coupled to the closing block 4 ;
A cable through hole 23 into which the fixed cable 3 is inserted is formed through the bottom surface of the concave groove 20;
When the upper end of the closing block 4 is fitted in close contact with the inner surface of the concave groove 20, the end of the fixed cable 3 passes through the cable through hole 23 and protrudes into the precast tunnel module 2;
After pulling the end of the fixed cable 3 protruding into the inside of the precast tunnel module 2 with a tension device, fasten the tension device to the end of the fixed cable 3 and fix it, so that the fixed cable 3 is in a tense state. An underwater tunnel construction method, characterized in that it has a configuration in which tension is introduced to the fixed cable (3) by being fixed. delete The method of claim 1,
The lower end of the guide chain 5 is coupled to the coupling bolt 40, so that the guide chain 5 passes through the bolt hole 22 of the concave groove 20 and enters the inside of the precast tunnel module 2 Underwater tunnel construction method, characterized in that. As an underwater tunnel constructed by sequentially connecting precast tunnel modules having a hollow space through which vehicles or people can pass,
An underwater tunnel constructed by the method of claim 1 or 3, characterized in that it has a structure in which a plurality of precast tunnel modules are integrated and connected.

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