KR20190019530A - Retaining wall method by using the precast house(PC house) of bridge building - Google Patents

Abstract

The present invention provides a retaining wall construction method using a PC house for installing a cast-in-place pile, which is a base of a bridge, and a footing (1) structure. According to the construction method, the PC house is installed on the ground above a groundwater level, the inside is excavated to insert the PC house into the ground, and the cast-in-place pile is constructed. Underwater concrete is placed at a lower portion of the PC house to form a water shield layer (50) and water is drained to make a dry state (60). Thereafter, a steel reinforcement (70) is assembled in the PC house to be connected to the pile and concrete is placed to complete the footing (1) structure.

Description

{Retaining wall method using a precast house (PC house) of a bridge house using a precast house}

The present invention relates to a construction of a PC house used as a footing structure of a bridge, and more particularly to a pile foundation installed in the ground with a high groundwater level and a footing structure coupled with the pile foundation In this paper, we propose a method for constructing bridge foundation quickly and economically by excavating the inside of PC house, sinking it into the ground and using it as a retaining pavement, and then connecting it with a pile foundation to construct a footing structure.

Generally, for the foundation (footing) of a pier installed in the ground where the groundwater level is high, it was installed with a seat file and excavated inside, followed by footing.

FIG. 1 illustrates the construction of a foundation of a bridge by installing a retaining wall and excavating the inside of the retaining wall by a general method.

When the underground water level is high and the footing structure is submerged in water, the sheet file is closed to the submergence layer, and the inside of the earthmoving is excavated while the water level is lowered and dried.

Conventional patents refer to 'rectangular concrete caisson retaining structure (20-0224758)'. This patent is similar to the present invention in the case of a rectangular concrete caisson, but since the rectangular caisson directly reaches the support layer, application of the method is limited when the support layer of the structure is deeply located.

As another patent, 'Underwater retaining structure using steel pipe file (10-0862902)' was announced. The above patent has an advantage of reducing internal support by using a steel pipe file having higher rigidity than a general sheet file.

However, in order to take orders, steel pipes must be deeply penetrated into the underground aquifer so that the construction cost increases and the construction period becomes longer.

KR 20-0224758 A KR 10-0862902 B1

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a method for constructing a bridge pier in an area using a cast pile having a high groundwater level and a pile foundation, There is no need to install a retaining structure to the aquifer, and a method of forming a footing structure combining the pile foundation of a bridge by simultaneously performing the car manual work and the earth retaining work using the footing structure without installing the retaining structure separately do.

In order to achieve the above object, the 'retaining method using a PC house of a bridge' according to the present invention is a method of connecting a footing structure of a bridge to a casting pile, Wherein the footing structure is made of a PC house made of reinforced concrete and the upper and lower openings of the PC house are installed on the ground; Excavating the inner soil and penetrating it into the ground; A step of constructing a casting pile into the PC house; Forming a water receiving layer for sealing the space between the lower inner circumferential surface of the PC house and the casting pile by placing concrete in the lower portion of the PC house; A step of draining the water inside the PC house to make the interior of the PC house dry; And a step of assembling the reinforcing bars in the PC house and casting the concrete to construct a footing structure including the casting piles.

In addition, in the order of construction of the PC house and the excavated pile, a step of installing the PC house on the outer periphery of the pile foundation after the excavation of the excavated pile, And a step of burying the house in the ground.

As described above, according to the present invention, it is possible to excavate the inside of the PC house of the footing without a sheet file or a steel pipe file reaching to the aquifer, and to penetrate the PC house into the ground to retain the earth. In order to make the interior of the PC house dry, it is necessary to place the water-absorbing concrete in the bottom of the PC house to form an aquifer, drain the water inside the PC house, .

The proposed method of the present invention for forming a retaining structure and an aquifer using a PC house as a footing structure and combining a pile foundation and a PC house in a PC house to form a pier foundation is more effective than the conventional construction method Air can be shortened.

FIG. 1 shows a footing structure construction after a conventional earth retaining structure,
2 is a perspective view of a PC house of the present invention,
FIG. 3 illustrates the PC house installation S1 and intrusion (S2) steps of footing,
FIG. 4 illustrates a pile installation (S3) and an aeration installation (S4)
Fig. 5 illustrates a dry state S5 and a rebar assembly (S6) process,
FIG. 6 illustrates construction (S7) of footing and construction (S8) of a bridge pier.
Figure 7 illustrates another implementation (T1 to T3) of the present invention.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a schematic view showing a state in which the earth retaining wall 2 reaches the underground water layer 50 in a region where the groundwater level 30 is high and the groundwater is prevented from flowing in the earth retaining wall 2 (3) The footing (1) foundation can be installed.

Figure 2 shows a PC house 10 made for a footing 1 structure in a perspective view of an embodiment of the present invention.

Here, the lower end of the PC house 10 is formed in a wedge shape, so that it is preferable to smoothly penetrate the ground during excavation of the internal soil.

Figs. 3 to 6 are embodiments of the present invention, and concrete working steps are specifically shown as S1 to S8.

Fig. 3 shows the steps S1 and S2 of the present invention.

S1 shows an embodiment in which the PC house 10 is installed on the ground.

Here, the PC house 10 can be manufactured at the site installation location or can be manufactured at another location and moved.

In order to utilize the PC house as a structure of the building (1) as well as the retaining structure (2) for the PC house (10), a coupler (not shown) It is preferable to embed it.

It is preferable that the coupler is connected to the reinforcing bars 70 of the footing 1 to be assembled in the PC house 10 in the step S6 to be described later so that the PC house 10 is utilized as a footing 1 structure.

S2 shows a state where the inside of the PC house 10 is excavated and the PC house 10 is intruded into the ground.

The PC house 10 may be immersed in the ground by excavating the inside of the PC house 10 using a crane shell or backhoe of the crane or by raising the load at the top of the PC house 10, A method of using an earth anchor and hydraulic equipment connected thereto can be used. At this time, a water level of the same height as the surrounding ground water level is formed inside the PC house 10.

Also, it is possible to include a method of forming the soil inside the PC house 10 a little higher and maintaining the shape of the cast-in-place pile in a step S3 described later.

FIG. 4 illustrates steps S3 and S4 of the present invention.

Step S3 is an example of constructing a pile foundation inside the PC house 10 after excavating the inside of the PC house 10, and specifically showing an example of installing the site drilling pile 40 .

In this case, the ground drilled pile 40 is exposed higher than the ground surface. As a method of exposing the ground higher than the ground surface, a first sacrificial steel pipe is used, or a second ground 20 is raised a little, The method of lowering the ground 20 after maintaining the shape of the ground pile 40 and the method of forming the shape of the ground drilled pile 40 by using the form.

Step S4 shows a process of forming the aeration layer 50 in the PC house 10. [

The aquifer 50 formed by placing concrete in water is installed under the PC house 10. The aeration layer 50 serves to prevent water outside the PC house 10 from entering the PC house 10.

Here, it is preferable to install a wire mesh or a reinforcing bar 70 in order to increase the resistance to buoyancy with respect to the concrete placed in the water.

When the buoyant force acts on the aquifer layer 50 by combining the ground drilled pile 40 with the PC house 10, the aqueduct pile 40 functions as an anchoring anchor, 50) and the PC house in the ground.

Fig. 5 shows the steps S5 and S6 of the present invention.

Step S5 shows an embodiment in which the water in the PC house 10 is drained after the aeration layer 50 is formed to form the dry state 60. [

In step S6, the reinforcing bars 70 are assembled in the PC house 10 after the working conditions are in the dry state 60, so that the exposed reinforcing bars of the casting piles and the reinforcing bars 70 of the putting 1 are combined Lt; / RTI >

Here, in order to use the PC house 10 as a part of the footing 1 structure, a reinforcing coupler embedded in the PC house 10 such that the inner reinforcing bar 70 and the PC house 10 are coupled by the reinforcing bars 70 Or by welding.

Fig. 6 shows steps S7 and S8 of the present invention.

Step S7 shows an embodiment in which the concrete is laid in the PC house 10 to complete the structure of the footing (1).

The S8 process shows an embodiment in which after the completion of the putting (1) structure, the pier (3) structure is successively constructed.

FIG. 7 shows a process of T1 to T3 which is another embodiment of the present invention.

T1 is the first step of constructing a drilled pile.

T2 is a process in which the PC house 10 is installed on the ground after the casting of the cast-in-place pile.

Here, it is preferable that the PC house 10 is manufactured directly in the field, or it is manufactured and transported in another production site.

T3 is a process in which the PC house 10 is installed and then excavated inside the PC house 10 and penetrated into the ground.

Thereafter, the process of forming the aeration layer 50 and constructing the footing (1) is performed in the same manner as the processes of S4 to S8.

1: footing 2: earthwork 3: pier
10: PC House 20: Ground 30: Groundwater level
40: Field casting pile
50: an aisle
60: Dry state
70: Rebar

Claims (2)

In a construction for connecting a footing structure of a bridge, the footing and the cast-in-place pile 40, in a construction condition in which a part or all of the footing is buried in the ground,
(1) a step (S1) of constructing a PC house (10) made of reinforced concrete in a precast house and having upper and lower openings on the ground;
A step (S2) of excavating the soil within the PC house (10) and penetrating it into the ground;
A step (S3) of installing a site-drilled pile (40) in the PC house (10);
(S4) of forming an aquifer layer (50) for enclosing a space between a lower inner circumferential surface of the PC house (10) and the shaved pile (40) by placing concrete under the PC house (10);
A step (S5) of draining water inside the PC house (10) to convert the interior of the PC house (10) into a dry state (60);
A step S6 of assembling the reinforcing bars 70 in the PC house 10 and a step S7 of constructing a footing 1 structure including the casting piles 40 by pouring concrete Retaining method using PC house (Precast house) of bridges.
In order to construct the PC house (10) and the cast-in-place pile (40) according to claim 1,
A process (T2) of installing the PC house (10) on the outer periphery of the field drilled pile (40) after the step (T1) of constructing the ground drilled pile (40) And a step (T3) of excavating the PC house (10) and grounding the PC house (10).

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