KR100937740B1 - A method of constructing precast concrete house under water using caisson - Google Patents

Abstract

Underwater PC house caisson method installs a foundation pile around the foundation pile by installing the foundation pile, drains the interior of the barrier membrane to install the lower bracket, seats the PC house on the lower bracket, and then installs the steel caisson on the top, Place the bridge foundation on the top of the steel caisson and drain the interior of the PC house. According to the underwater PC house caisson method configured in this way, the steel caisson installed on the upper part of the PC house to dry the work inside the PC house to improve the workability and reduce the construction cost, the load that is seated on the upper steel caisson Since the PC house can be prevented from supporting by loading, there is an advantage in that construction convenience is improved.

Description

A METHOD OF CONSTRUCTING PRECAST CONCRETE HOUSE UNDER WATER USING CAISSON}

The present invention relates to an underwater PC house caisson method, and more particularly, to a method for assembling a PC house using caisson underwater.

Generally, pier foundations are constructed underwater to position bridge decks that can be passed by railroads, vehicles, and pedestrians at a certain height in the water surface. Pier foundations are mainly manufactured with a larger diameter than the pier, and are constructed to be buried to a certain depth in the bottom of the water to impart a fixed force.

Since these bridges are constructed at the water level, there are many constraints on the work and underwater construction must be carried out, which requires expensive construction costs. In recent years, the length of the lower foundation is increased by increasing the length of the piers in order to reduce the underwater construction, causing the construction cost to increase.

In general, as a method for forming a bridge foundation, there is a method using a pile foundation and a PC house (PC house). The PC house refers to a structure installed by transporting and assembling the precast concrete assembly prefabricated on land.

In order to assemble the PC house on the pile foundation, it is necessary to connect the bracket to the pile foundation by welding or to assemble the divided PC house assemblies to each other. In order to connect the bracket to the pile foundation, welding is performed while the top of the pile foundation is exposed out of the water surface.

However, in the case where the depth of the area or the top of the pile foundation is not exposed out of the water surface only by the tidal difference, the work of connecting the bracket to the pile foundation is very difficult or a diver needs to use a diver, so the construction cost is very large.

The present invention is to solve such a conventional problem, it is an object of the present invention to install a PC house using a caisson even when the top of the area or the pile foundation is changed out of the water surface.

According to a feature of the present invention for achieving the above object, the underwater PC house caisson method of the present invention is the foundation pile installation step of incorporating the foundation pile on the bottom of the bed; Installing a temporary curtain around the foundation pile and installing the temporary curtain to drain the water therein; A lower bracket installation step of installing a lower bracket on the foundation pile and dismantling the temporary barrier; A PC house installation step of seating the PC house on the lower bracket; Steel caisson installation step of installing a steel caisson on the top of the PC house; A load loading part installing step of installing a load loading part on an upper portion of the steel caisson; An upper bracket installation step of draining the inside of the PC house and installing an upper bracket; A bridge foundation construction step of dismantling the load bearing part and constructing a bridge foundation part in the PC house; and preferably, a steel caisson dismantling step of dismantling the steel caisson.

The PC house installation step of the present invention preferably includes the PC house connection step of connecting the PC house divided into a plurality.

The PC house connection step of the present invention preferably includes a pretension step of connecting the divided PC houses by pretensioning connection lines provided in the plurality of PC houses.

In the PC house connection step of the present invention, it is preferable to install the water repellent material between the connection parts provided at the connection points of the divided PC house, and to cast concrete at the connection points.

PC house connection step of the present invention preferably includes a support installation step of installing a support in the PC house.

In the installation step of the temporary curtain of the present invention, the temporary curtain is installed around a plurality of foundation piles corresponding to the area of the divided PC house, and when the lower bracket is installed, the temporary curtain is installed around the new multiple foundation piles. It is preferable to repeat doing.

In the lower bracket installation step of the present invention, it is preferable to install the lower bracket in response to the temporary barrier that is repeatedly installed.

Steel caisson installation step of the present invention preferably comprises the step of connecting the PC house and the steel caisson by tensioning the connecting rod using a hydraulic jack.

The provision of the provisional barrier of the present invention preferably includes a stepping groove forming step of forming a recessing groove by dredging the bottom surface of the lower surface on which the temporary closure is to be seated.

A second embodiment of the underwater PC house caisson method of the present invention includes a foundation pile installation step of placing the foundation pile on the bottom of the bed; Installing a temporary curtain around the foundation pile and installing the temporary curtain to drain the water therein; A lower bracket installation step of installing a lower bracket on the foundation pile and dismantling the temporary barrier; PC house installation step of seating each of the divided PC house is connected to the steel caisson divided in the lower bracket; An assembling step of connecting the divided steel caisson and the divided PC house, respectively; A load loading part installing step of installing a load loading part on an upper portion of the steel caisson; An upper bracket installation step of draining the inside of the PC house and installing an upper bracket; A bridge foundation construction step of dismantling the load bearing part and constructing a bridge foundation part in the PC house; and preferably, a steel caisson dismantling step of dismantling the steel caisson.

In the assembly step of the present invention, it is preferable to connect the divided PC houses by pretensioning the connection lines provided in the plurality of PC houses, and to connect the divided steel caissons by tensioning the connecting rods using a hydraulic jack.

In the assembling step of the present invention, it is preferable to install the water receptacle on the joint surface of the divided PC house and the joint surface of the divided steel caisson, respectively.

The assembling step of the present invention preferably includes a support installation step of installing a support in the PC house.

A third embodiment of the underwater PC house caisson method of the present invention includes a foundation pile installation step of placing the foundation pile on the bottom of the bed; Installing a lower temporary curtain around the foundation pile and installing the lower temporary curtain for draining the water inside; A lower bracket installation step of installing a lower bracket on the foundation pile and dismantling the lower temporary closure; A PC house installation step of seating the PC house on the lower bracket; Installing the upper temporary curtain on the foundation pile inside the PC house and installing the upper temporary curtain to drain the water inside; An upper bracket installation step of installing an upper bracket on the foundation pile inside the upper temporary shield; A steel caisson installation step of dismantling the upper clamshell and installing a steel caisson on the top of the PC house; It is preferable to include a bridge foundation construction step of constructing the bridge foundation by draining the PC house; and steel caisson disassembly step of dismantling the steel caisson.

It is preferable to include the step of installing the water repellent material in the lower temporary closure of the present invention and the upper temporary closure.

The upper bracket and the lower bracket of the present invention preferably includes a step of installing a bracket stopper.

It is preferable that the upper bracket and the lower bracket of the present invention preferably comprises the step of installing the water repellent material in contact with the PC house.

It is preferable to include the step of pouring the connection concrete at the point where the upper bracket and the lower bracket and the foundation pile of the present invention is connected.

In the lower bracket installation step of the present invention, the connection plate is installed at the end of the lower clamper, and the watertight material is installed between the connection plate and the foundation pile to be fixed integrally, and the foundation pile and the provisional article for the lower portion. It is preferable to include the step of providing a temporary stopper at the portion where the membrane is in contact.

The PC house bridge structure of the present invention is preferably constructed by the underwater PC house caisson method.

In the construction method of the PC house and the caisson of the present invention in the method of installing a bridge structure by installing a steel caisson on the top of the PC house, the PC house and the steel caisson are connected by a connecting rod and a connection nut, the division It is preferable that the PC house is connected by a connection part, and the PC house and the bridge foundation are connected by an upper bracket, a lower bracket, and a connecting concrete that is poured between the upper bracket and the lower bracket.

One end of the connecting rod is connected to the PC house and the steel caisson of the present invention by a connecting nut provided on the side of the PC house, and the connecting rod is extended to the steel house to be connected by tensioning the connecting rod.

In the divided PC house of the present invention, a water stopper is inserted between the protrusions of the connection part which protrudes further downward from the bottom of the PC house, and the upper surface of the connection part is preferably superhard concrete poured.

It is preferable that an index member is provided between the PC house and the steel caisson of the present invention.

According to the underwater PC house caisson method according to the present invention, even when the water level change is severe or the PC house is installed in the water can be carried out dry work inside the PC house by the steel caisson installed on the top of the PC house. As a result, workability can be improved and construction cost can be reduced, and the PC house can be prevented from being floated by the load loading portion seated on the upper part of the steel caisson. Since the upper bracket and the lower bracket can be installed, there is an advantage that the construction convenience is improved.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the underwater PC house caisson method according to the present invention will be described in more detail.

1 to 11 show a preferred embodiment according to the first embodiment of the underwater PC house caisson process according to the present invention.

As shown in FIG. 1, the foundation pile 10 forming the foundation of the structure is inserted to a predetermined position. Since the foundation pile 10 is installed on the bottom surface of the lower bed, it is preferable that the foundation pile 10 enters the rock bed.

When the entrance of the foundation pile 10 is completed, the mounting groove 21 for seating the temporary barrier 30 is formed around the periphery of the foundation pile 10 is installed. The seating groove 21 may be formed using a dredge crane 23 located in the water.

When the seating groove 21 is formed, as shown in FIG. 2, a temporary barrier 30 is installed around the foundation piles 10 of about 3 to 4. The temporary barrier 30 is for dry construction of the lower bracket 40 connected to the top of the foundation pile 10 may be composed of a general caisson.

When the installation of the temporary film 30 is completed, the water in the temporary film 30 is drained. When all of the water in the temporary film 30 is drained, the lower bracket 40 is connected to the top of the foundation pile 10 as shown in FIG. The lower bracket 40 serves to support the PC house 50 is mounted on the top.

The outer surface of the base pile 10 corresponding to the lower surface of the lower bracket 40 may be provided with a bracket stopper 41 (see FIG. 12) to prevent the lower bracket 40 from moving downward.

When the lower bracket 40 is connected to the top of the foundation pile 10, after dismantling the temporary barrier 30 installed around the foundation pile 10, another foundation pile not yet connected to the lower bracket 40. (10) Install the temporary shield 30 around the lower bracket 40 is installed. By repeating the above process, the lower bracket 40 can be installed on the top of all the foundation piles 10.

When the lower bracket 40 is connected to the upper end of all the foundation piles 10, as shown in FIG. 4, the split bracket of the PC house 50 made of the precast concrete block is attached to the lower bracket (the upper portion of the foundation pile 10). Seat 40). Since the PC house 50 has a weight corresponding to several tens of tons, it is preferable that the PC house 50 is divided into three to four parts.

Side lines of the PC house 50 and the inside of the bottom plate is provided with a connecting line 51 to closely contact the divided PC house 50 partitions as shown in FIG. The connecting line 51 is composed of a PC steel wire, is provided in the connecting pipe 53 which may be composed of PVC pipe for the sheath pipe embedded in the side and bottom plate of the PC house 50.

After the divided PC house 50 partitions are connected to each other, the divided PC house 50 may be hermetically connected by tensioning both ends of the connecting line 51 to apply pretension. In addition, a connecting rod groove 55 for connecting the steel caisson 60 and the PC house 50 to be described below is formed at an upper side of the side plate around the PC house 50.

A plurality of supports 57 are installed in the PC house 50. The support 57 is to give a bearing force against the water pressure applied to the surrounding after draining the inside of the PC house 50.

Concave-convex connecting portions 59 are formed at portions where the divided parts of the PC house 50 are connected to each other, so that the divided PC houses 50 may be connected to each other by connecting the connecting portions 59 to each other.

As shown in FIG. 6, the connection portion 59 protruding downward from the lower surface is provided at a portion to which the division of the PC house 50 is connected. The thickness of the point where the split body of the PC house 50 is connected by the connecting part 59 may be increased to prevent the connection part rigidity of the split body from being lowered.

In addition, the upper portion of the connecting portion 59, that is, the portions where the divisions of the PC house 50 are connected are spaced at predetermined intervals, and reinforcing bars are wired to portions where the divisions of the PC house 50 are spaced at the predetermined intervals. Concrete 59c is poured.

The connecting portion 59 is provided with a protrusion 59t having a predetermined shape. In addition, the water discharge member 63 is formed at the point where the protrusions 59t are connected to each other to form a watertight state by hermetically connecting the connection points of the protrusions 59t.

When the PC house 50 is installed, the steel caisson 60 is connected to the upper surface of the PC house 50 as shown in FIG. The side surface of the steel caisson 60 may extend to a height above the water surface and dry operation may be performed by draining the water inside the steel caisson 60.

The PC house 50 and the steel caisson 60 are hermetically connected by a connecting rod 61 connected to the connecting rod groove 55 formed on the side of the PC house 50.

10 shows the connection structure of the PC house 50 and the steel caisson 60 in detail. As shown, the connection pipe 53 is provided inside the side of the PC house 50, the connection line 51 is provided inside the connection pipe 53. By tensioning the connecting line 51 and applying pretension, the divided PC houses 50 may be hermetically connected to each other.

In addition, the connecting rod 61 is connected to the connecting rod groove 55 formed at the upper side of the PC house 50. The connecting rod 61 extends from the top of the PC house 50 to the steel caisson 60. One end of the connecting rod 61 is provided with a connection nut 65 to fix the connecting rod 61 to the side of the PC house 50.

When the connecting rod 61 is fixed to the PC house 50, the PC house 50 and the steel caisson 60 are hermetically connected by tensioning the connecting rod 61 using a hydraulic jack. Between the PC house 50 and the steel caisson 60 is provided with an index member 63 to prevent water from flowing from the outside.

When the PC house 50 and the steel caisson 60 are connected, the load loading portion 70, which may be configured as a block, is seated on the upper surface of the steel caisson 60. When the PC house 50 connected to the steel caisson 60 is drained out of the PC house 50 in a state in which it is not completely coupled to the foundation pile 10, the PC house 50 and the steel caisson ( 60) can support this. Therefore, it is possible to prevent the PC house 50 and the steel caisson 60 from lifting by buoyancy by seating the load bearing part 70.

When the load bearing portion 70 is seated, the water inside the PC house 50 and the steel caisson 60 is drained. When all of the water is drained to form a dry state, the PC house 50 and the foundation pile 10 may be connected to the upper bracket 80 to completely couple the PC house 50 and the foundation pile 10. have. A bracket stopper 41 may also be provided on the foundation pile 10 on which the upper bracket 80 is installed.

When the upper bracket 80 is coupled to the foundation pile 10, the load bearing portion 70 is dismantled. Then, reinforcement and foundation concrete are poured into the PC house 50 to complete the bridge foundation 90.

The cross-sectional state in which the bridge foundation 90 is installed is shown in FIG. As shown in the drawing, a support 57 is installed in the steel caisson 60 to cope with external hydraulic pressure.

When the bridge foundation 90 is completed, the construction is completed by disassembling the steel caisson 60.

As a second embodiment of the underwater PC house caisson method according to the present invention will be described a method of combining underwater in the state in which the PC house 50 and the steel caisson 60 are integrally coupled.

That is, when the PC house 50 is seated on the lower bracket 40 of the foundation file 10 after the foundation pile 10 is installed, the steel caisson 60 divided at the upper end of the PC house 50 is integrally formed. Seated on the lower bracket 40 in a coupled state. Of course, the steel caisson 60 should be configured in a divided state according to the size of the divided PC house 50. The divided steel caisson 60 may be interconnected by using the connecting rod 61.

When the PC house 50 and the steel caisson 60 are integrally seated on the lower bracket 40, the PC house 50 and the steel caisson 60 are connected to each other. In addition, after the load loading portion 70 is seated on the upper portion of the steel caisson 60, the bridge foundation 90 may be constructed by draining the water inside the PC house 50.

As a third embodiment of the underwater PC house caisson method according to the present invention, a method of installing the upper bracket 80 and the lower bracket 40 without using the load bearing portion 70 will be described.

12 and 13 show a construction state provided by the third embodiment of the underwater PC house caisson process according to the present invention. 12 shows a state in which the lower bracket 40 according to the present invention is connected to the foundation pile 10.

As shown, in order to install the lower bracket 40 on the foundation pile 10, a temporary barrier 30 is provided for each foundation pile 10. As shown in FIG. The temporary curtain 30 includes a lower temporary curtain 31 for installing the lower bracket 40, and an upper temporary curtain 33 for installing the upper bracket 80.

A lower temporary closure 31 for installing the lower bracket 40 is shown in FIG. 12. As shown in the drawing, the lower end portion 35 of the lower provisional seal 31 is formed so that the width thereof becomes narrower toward the lower portion 35 so that the lower provisional seal 31 is closely connected to the foundation pile 10. Is provided.

In addition, a connection plate 37 is provided at a point at which the finish part 35 and the foundation pile 10 are connected, and the index member 63 is disposed between the connection plate 37 and the outer surface of the foundation pile 10. Is provided. The connection plate 37 may be in close contact with the outer surface of the foundation pile 10 together with the index member 63 to maintain the interior of the temporary temporary sealer 31 in a watertight state.

In addition, the outer surface of the foundation pile 10 connected to the lower surface of the connecting plate 37 is provided with a temporary film stopper 39 to prevent the lower temporary film 31 from moving downward.

When the lower bracket 40 is connected to the foundation pile 10, after disassembling the lower provisional seal 31, the lower provisional membrane is attached to another foundation pile 10 on which the lower bracket 40 is not yet installed. Install (31) to install the lower bracket (40). Repeat this process to install the lower bracket 40 on the top of all the foundation pile (10).

When the lower bracket 40 is installed, the partition of the PC house 50 is seated on the top of the foundation pile 10, and then the divided PC houses 50 are connected to each other. When the PC house 50 is connected, an index member 63 is installed on an upper surface of the lower bracket 40 on which the PC house 50 is seated, as shown in FIG. 13.

When the PC house 50 is connected, as shown in FIG. 13, the upper temporary shield 33 is installed in the PC house 50.

As shown in FIG. 13, an index member 63 is provided at a point where the upper temporary shield 33 and the PC house 50 come into contact with each other. When the upper temporary shield 33 is installed in the PC house 50, the inside of the PC house 50 is drained to form a dry state.

In addition, the upper bracket 80 is installed at the point where the foundation pile 10 and the PC house 50 are in contact with each other. An index member 63 may be installed between the upper bracket 80 and the PC house 50. At this time, the outer surface of the foundation pile 10 in contact with the upper surface of the upper bracket 80 may be provided with a bracket stopper 41 to prevent the upper bracket 80 from moving upward.

When the upper bracket 80 is installed on the foundation pile 10, the connection concrete 83 is poured at a point where the upper bracket 80, the foundation pile 10, and the lower bracket 40 are connected to each other. Integrate the connection part.

When the upper bracket 80 is installed, the upper clamshell 33 is dismantled and the steel caisson 60 is connected to the upper surface of the PC house 50. Then, after draining the inside of the steel caisson 60 to form a dry state, installation is completed by installing the bridge foundation 90 and dismantling the steel caisson 60.

When using the upper clamshell 33 and the lower clamshell 31 in this way, do not install the load loading portion 70 to prevent the support of the PC house 50 is connected to the steel caisson 60 You don't have to.

In the scope of the basic technical spirit of the present invention, many modifications are possible to those skilled in the art, and the scope of the present invention should be interpreted based on the claims below. .

Underwater PC house caisson method according to the present invention as described in detail above has the following advantages.

Even if the water level is severe or the PC house is installed underwater, the steel caisson installed at the top of the PC house can be carried out dry work inside the PC house has the advantage of improved workability and construction costs.

In addition, the PC house can be prevented from supporting by the load loading portion seated on the upper part of the steel caisson, and the upper bracket and the lower bracket may be installed using the upper cladding block and the lower cladding block without the load loading part. There is an advantage that the convenience is improved.

1 is a cross-sectional view showing a step of constructing the foundation pile of the underwater PC house caisson method according to the present invention.

Figure 2 is a construction cross-sectional view showing a step of constructing a cloak of the underwater PC house caisson method according to the present invention.

Figure 3 is a cross-sectional view showing the step of connecting the lower bracket to the top of the foundation pile of the underwater PC house caisson method according to the present invention.

Figure 4 is a cross-sectional view showing the step of connecting the divided PC house of the underwater PC house caisson method of the present invention.

Figure 5 is a plan view showing a connection state of the PC house of the underwater PC house caisson method according to the present invention.

6 is a cross-sectional view of an enlarged portion P of FIG.

7 is a construction sectional view showing a state in which the steel caisson and the load-bearing portion of the underwater PC house caisson method according to the present invention is installed.

8 is a cross-sectional view showing the step of constructing the bridge foundation of the underwater PC house caisson method according to the present invention.

9 is a construction sectional view showing the step of constructing the bridge foundation of the underwater PC house caisson method according to the present invention.

FIG. 10 is a cross-sectional view of an enlarged portion A of FIG. 8;

11 is a cross-sectional view showing the construction state of the bridge foundation is dismantled steel caisson of the underwater PC house caisson method according to the present invention.

12 is a cross-sectional view showing a connection state of the lower bracket according to the third embodiment of the underwater PC house caisson method according to the present invention.

Figure 13 is a cross-sectional view showing a connection state of the upper bracket according to the third embodiment of the underwater PC house caisson method of the present invention.

Description of the main parts of the drawing

10: foundation file 30: cloak

31: upper temporary film 33: lower temporary film

35: finish portion 37: connecting plate

39: stopper stopper 40: lower bracket

41: Bracket Stopper 50: PC House

51: connector 59: connector

60: steel caisson 61: connecting rod

63: index material 70: load bearing

80: upper bracket 83: connection concrete

Claims (24)

A basic file installation step of incorporating the foundation file on the bottom surface of the lower bed; Installing a temporary curtain around the foundation pile and installing the temporary curtain to drain the water therein; A lower bracket installation step of installing a lower bracket on the foundation pile and dismantling the temporary barrier; A PC house installation step of seating the PC house on the lower bracket; Steel caisson installation step of installing a steel caisson on the top of the PC house; A load loading part installing step of installing a load loading part on an upper portion of the steel caisson; An upper bracket installation step of draining the inside of the PC house and installing an upper bracket; A bridge foundation construction step of dismantling the load bearing part and constructing a bridge foundation in the PC house; and Comprising a steel caisson disassembly step of dismantling the steel caisson Underwater PC house caisson method. The method of claim 1, The PC house installation step Comprising the PC house connection step of connecting the PC house divided into a plurality Underwater PC house caisson method. The method of claim 2, The PC house connection step A pretensioning step of connecting the divided PC houses by pretensioning connection lines provided in the plurality of PC houses; Underwater PC house caisson method. The method of claim 2, The PC house connection step The installation of the water repellent material between the connection portion provided in the connection point of the divided PC house, and placing the concrete in the connection point Underwater PC house caisson method. The method of claim 2, The PC house connection step Comprising a support installation step of installing a support in the PC house Underwater PC house caisson method. The method of claim 2, The faucet installation step Installing the clampers around a plurality of foundation piles corresponding to the area of the divided PC house, and if the lower bracket is installed, repeating installing the clampers around a plurality of new foundation piles again. Underwater PC house caisson method. The method of claim 6, The lower bracket installation step To install the lower bracket in response to the temporary curtain is installed repeatedly Underwater PC house caisson method. The method of claim 1, The steel caisson installation step Tensioning the connecting rod using a hydraulic jack to connect the PC house to the steel caisson; Underwater PC house caisson method. The method of claim 1, The faucet installation step And a seating groove forming step of forming a seating groove by dredging the bottom surface of the bottom on which the temporary barrier is to be seated. Underwater PC house caisson method. A basic file installation step of incorporating the foundation file on the bottom surface of the lower bed; Installing a temporary curtain around the foundation pile and installing the temporary curtain to drain the water therein; A lower bracket installation step of installing a lower bracket on the foundation pile and dismantling the temporary barrier; PC house installation step of seating each of the divided PC house is connected to the steel caisson divided in the lower bracket; An assembling step of connecting the divided steel caisson and the divided PC house, respectively A load loading part installing step of installing a load loading part on an upper portion of the steel caisson; An upper bracket installation step of draining the inside of the PC house and installing an upper bracket; A bridge foundation construction step of dismantling the load bearing part and constructing a bridge foundation in the PC house; and Comprising a steel caisson disassembly step of dismantling the steel caisson Underwater PC house caisson method. The method of claim 10, The assembly step Pre-tension the connection lines provided in the plurality of PC houses to connect the divided PC house, The hydraulic jack is used to tension the connecting rod to connect the divided steel caissons. Underwater PC house caisson method. The method of claim 10, The assembly step To install an index member on the joint surface of the divided PC house and the joint surface of the divided steel caisson, respectively Underwater PC house caisson method. The method of claim 10, The assembly step Comprising a support installation step of installing a support in the PC house Underwater PC house caisson method. A basic file installation step of incorporating the foundation file on the bottom surface of the lower bed; Installing a lower temporary curtain around the foundation pile and installing the lower temporary curtain for draining the water inside; A lower bracket installation step of installing a lower bracket on the foundation pile and dismantling the lower temporary closure; A PC house installation step of seating the PC house on the lower bracket; Installing the upper temporary curtain on the foundation pile inside the PC house and installing the upper temporary curtain to drain the water inside; An upper bracket installation step of installing an upper bracket on the foundation pile inside the upper temporary shield; A steel caisson installation step of dismantling the upper clamshell and installing a steel caisson on the top of the PC house; Bridge foundation construction step of constructing the bridge foundation by draining the PC house; And Comprising a steel caisson disassembly step of dismantling the steel caisson Underwater PC house caisson method. The method of claim 14, And installing a water repellent material on the lower temporary curtain and the upper temporary curtain. Underwater PC house caisson method. The method of claim 14, And installing a bracket stopper on the upper bracket and the lower bracket. Underwater PC house caisson method. The method of claim 16, And installing an index member at a point where the upper bracket and the lower bracket contact the PC house. Underwater PC house caisson method. The method of claim 14, At the point where the upper bracket and the lower bracket and the base pile is connected, the step of placing a connection concrete; Underwater PC house caisson method. The method of claim 14, The lower bracket installation step A connection plate is installed on the finishing part of the lower temporary closure; An index member is installed between the connecting plate and the foundation pile to be fixed integrally, And installing a temporary stopper at a portion where the foundation pile and the lower temporary stopper come into contact with each other. Underwater PC house caisson method. Constructed by the construction method according to any one of claims 1 to 19. PC House Bridge Structures. The method according to any one of claims 1 to 19, in which a steel caisson is installed on an upper end of the PC house to install a bridge structure, The PC house and the steel caisson are connected by a connecting rod and a connecting nut, The divided PC house is connected by a connecting portion, The PC house and the bridge foundation are connected by an upper bracket, a lower bracket, and connecting concrete placed between the upper bracket and the lower bracket. Connection structure of PC house and caisson. The method of claim 21, The PC house and the steel caisson One end of the connecting rod is connected by a connecting nut provided on the side of the PC house, and the connecting rod is extended to the steel house to be connected by tensioning the connecting rod. Connection structure of PC house and caisson. The method of claim 21, The divided PC house The water repellent material is inserted between the protrusions of the connection part which protrudes further downward from the lower surface of the PC house, The upper surface of the connecting portion is cemented super hard concrete is connected Connection structure of PC house and caisson. The method of claim 21, An index member is provided between the PC house and the steel caisson. Connection structure of PC house and caisson.

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