KR101710075B1 - PC Method for constructing underground structure having Precast wall using Hpile and underground structure constructed by the same - Google Patents

Abstract

The present invention relates to a top-down construction method of a modular underground structure using a PC wall to which a supporting steel beam is applied, a modular underground structure constructed by the construction method, and a connection method of a PC wall and a PC slab. More particularly, the present invention relates to a method of manufacturing a plurality of PC walls and a PC slab, Excavating the trenches on both sides of the ground so as to be spaced apart in the width direction and interrupting the body portion of the PC wall to each excavated trench; Supporting the PC wall by interposing a supporting beam into each of the hollow holes formed in the body portion; Excavating a portion of the ground between the PC walls until a top portion of the body portion is exposed; Placing a plurality of PC slabs and connecting both ends to a pair of PC wall top sides; Restoring the road surface, excavating the inside of the lower side ground of the installed PC slab, and installing the lower slab; And a step of removing the supporting beams. The present invention relates to a method of top-down construction of a modular underground structure using a PC wall to which a supporting beam is applied.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of constructing a modular underground structure using a PC wall having a support beam, and a method of constructing a modular underground structure constructed by the construction method. }

The present invention relates to a top-down construction method of a modular underground structure using a PC wall to which a supporting steel beam is applied, a modular underground structure constructed by the construction method, and a connection method of a PC wall and a PC slab. More particularly, the present invention relates to a method for rapidly constructing an underground structure having a low depth of field as compared to a conventional construction method, at a lower cost, as an open-cut civil engineering construction technique.

The conventional open type construction method is classified into a temporary construction method, a permanent wall construction method, and a self-sustaining construction method according to the type of retaining wall. The pavement construction method uses the thumb pile method to support the excavation wall by using steel pile (H-pile), soil plate (pavement, brace), and steel pile And supporting the steel sheet pile method.

1 is a sectional view of an underground structure 1 to which a conventional earth retaining hole 2 and a ground reinforcement hole 3 are applied. As shown in FIG. 1, this method requires a retaining hole (2) and a ground reinforcement hole (3) using a hypothetical structure, which accounts for 34% of the total construction cost. In other words, it has disadvantages in terms of construction air and construction cost due to the construction of the ground and the reinforcement of the ground. In addition, since underground structures are installed on the ground in a narrow underground environment, the quality of the structure is deteriorated and the construction is disadvantageous in terms of the construction air, which leads to a prolonged traffic congestion in the upper roads.

In addition, the permanent wall construction method is a soil cement wall (SCW) method in which the excavation wall is formed by forming earth retaining walls with the soil concrete, and a field installation type pouring pile wall supporting the excavation wall by successively constructing the piling piles Cast-in-place pile (CIP) method, and an underground continuous wall construction method in which reinforced concrete is poured after excavation in the form of a vertical wall, or a precast wall is used to support the excavation wall.

2 is a cross-sectional view of an underground structure to which the conventional permanent wall method is applied. As shown in Fig. 2, the underground continuous wall body 7 is used as a permanent wall. However, as shown by a dotted line in Fig. 2, a portion of the upper wall of the main body is excessively wasted, Since the wall is supported by the strut bracket 4 and the upper slab 5 and the lower slab 6 are installed at the site, the economical efficiency due to the installation of the steel strut is lowered, The traffic congestion is prolonged.

In recent years, in order to exclude workspace constraints, an independent system such as an IPS (Innovative Prestressed Support) method, which supports an IPS system composed of an H-beam pedestal, a wrist strap and a steel wire on an excavation wall, However, there are many disadvantages in terms of economical efficiency and rapid construction for applying low-depth construction method.

In addition, the municipal government introduced a high-priced light rail to build an urban railway with less construction cost than the existing tunnel-type heavy-duty railway. However, due to complaints such as noise and vibration, urban scenery and privacy invasion, It is a fact that we demand.

The demand for underground light rail construction is expected to increase further, and it is required to develop a low depth construction technology that can be constructed at low cost for an underground system which is twice as expensive as a high cost construction.

The existing installation method mentioned above requires the installation of suspended obstruction or the installation of a separate temporary installation for earthworks and reinforcement of the ground at the time of opening. Therefore, the construction cost is required to be increased, and the construction of the underground structure And thus it is inevitable to cause congestion of road traffic due to the long period of opening of the road, and there is a problem of work space restriction due to the temporary construction.

Therefore, it is required to develop a low-cost and fast-setting construction technology that minimizes the traffic congestion in the upper roads and does not require the provisional construction because the underground structure is constructed at low depth along the road. .

KR 101364805 KR KR 101363878 KR KR 101088158 KR JP 3893056 JP

Accordingly, the present invention has been made in view of the above problems, and it is therefore an object of the present invention to provide a low-cost and high- Thereby providing a fast-setting method.

According to an embodiment of the present invention, the precast PC wall and the upper precast slab are used as a strut and a strut for supporting the precast PC wall and the upper precast slab, respectively, A high quality modular underground structure utilizing the slab as a permanent structure of an underground structure, and a top-down construction method thereof.

In addition, according to one embodiment of the present invention, there is provided a precast upper part which is applied to modular construction, which is rotated in the same direction as the direction of the obstacle, Thereby providing a connection method of the slab and the PC slab.

According to one embodiment of the present invention, the pre-cast upper slab is modularly manufactured for rapid construction, is connected and assembled in the field, and the slab itself acts as a strut for supporting the wall, Method.

According to an embodiment of the present invention, a high-quality precast wall and an upper slab are manufactured, and the connection between the module structures is assembled and connected to shorten the air of 50% or more compared with the existing construction method (1 m / day to 2.4 m / ) In order to provide a rapid construction method.

In addition, according to one embodiment of the present invention, the precast wall can be used as a main body of an underground structure and an earth retaining wall, and the precast upper slab can be used as a strut, It will provide a low-cost construction method that will utilize underground structures that can reduce the construction cost by more than 10% (20 million won / m → 17.2 million won / m) compared to the construction method.

According to an embodiment of the present invention, there is provided a top-down method capable of reducing air congestion by simplifying and consolidating the type of work by minimizing road traffic congestion due to rapid road surface recovery after constructing the upper slab do.

According to one embodiment of the present invention, since the upper slab is manufactured by half-precast modularization, construction can be performed irrespective of the presence of obstacle, and the level of the upper slab, Precision steel construction is possible by connecting the PC slabs by the longitudinally oriented tendon, and the upper part of the half-precast slab is installed with the cast concrete on site, thereby improving the strength and waterproof effect, To provide a connection method between the PC slab and the PC wall that can minimize the size of the PC slab.

According to an embodiment of the present invention, the upper end of the slab (the site of the spot installation) is connected to the reinforcement embedded in the PC wall through the coupler, Slabs) are connected and fastened to the slab reinforcement using C-channel and T-bolts embedded in the PC wall, and slab-level control plates are installed at the bottom of the slab, Providing a connection between the wall and the PC slab.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments with reference to the accompanying drawings.

A first object of the present invention is to provide a method of constructing an underground structure, comprising the steps of: preparing a plurality of PC walls and a PC slab and transporting them to a site; Excavating the trenches on both sides of the ground so as to be spaced apart in the width direction and interrupting the body portion of the PC wall to each excavated trench; Supporting the PC wall by interposing a supporting beam into each of the hollow holes formed in the body portion; Excavating a portion of the ground between the PC walls until a top portion of the body portion is exposed; Placing a plurality of PC slabs and connecting both ends to a pair of PC wall top sides; Restoring the road surface, excavating the inside of the lower side ground of the installed PC slab, and installing the lower slab; And a step of demolishing the supporting beams. The method of claim 1, further comprising:

Further, the supporting beam is an H file.

The method may further include the step of drilling the hollow hole auger at the bottom side ground of the burnt body after the step of arcing the body part of the PC wall.

Also, at least one of the PC wall and the PC slab may be prestressed.

When the PC wall is manufactured, a coupler for connecting a slab reinforcing bar provided on the inner side of the upper end is embedded, and a connecting reinforcing bar is embedded in both ends of the PC slab when the PC slab is manufactured.

The connecting step connects the PC wall to the PC slab by connecting the connecting reinforcing bars to the coupler for connecting the slab reinforcement.

The slab reinforcement connecting coupler can be adjusted in position by a position adjusting member embedded in the PC wall.

In addition, when the PC wall is manufactured, the PC wall reinforcing bars are embedded in the inside so that the ends protrude from the inner side of the upper end.

After the connecting step, a step of connecting a field-placing reinforcing bar and a PC wall reinforcing bar to a site piling connection coupler to place a field-casting reinforcing bar on the upper side of the PC slab and pouring the upper side of the PC slab And the like.

In addition, the position adjusting member may be configured as a C-channel.

The coupler for connecting the slab reinforcement may be T-bolt.

A second object of the present invention is to provide an underground structure having a body portion having a hollow hole penetrating in the height direction and a supporting beam member inserted in the hollow hole to support the body portion when constructed, A plurality of PC slabs connected at both ends to the upper end of the PC wall; And a lower slab disposed on the lower side of the plurality of PC walls, wherein the supporting beams are drawn out after the construction to be reused. The present invention can be achieved as a modular underground structure using a PC wall to which a support beam is applied .

Further, the PC wall may be characterized in that a mounting tuck is formed on the upper inner side surface.

The PC slab further includes at least one through hole extending in the width direction, and further includes a longitudinal tensional material inserted in the through hole of each of the plurality of PC slabs to be longitudinally tilted and mounted. have.

The PC slab is manufactured by embedding a connecting reinforcing bar at both ends thereof. The PC wall is manufactured by embedding a position adjusting member on the inner side of the mounting jaw. The connecting reinforcing bar is mounted on the position adjusting member, And is connected by a coupler for the slab reinforcement.

The PC wall is manufactured by inserting reinforcing bars of PC wall in the inside of the PC wall, and reinforcing bars are placed on the upper part of the PC slab by a coupler for reinforcing bars for putting on-site, and concrete is placed on the upper part of the PC slab . ≪ / RTI >

A third object of the present invention can be achieved as a modular underground structure using a PC wall to which a support beam is applied, in an underground structure, which is constructed by the construction method according to the first object.

A fourth object of the present invention is to provide a method of connecting a PC wall constituting an underground structure and a PC slab, comprising the steps of: preparing a plurality of PC walls and a PC slab, Excavating the trenches on both sides of the ground so as to be spaced apart in the widthwise direction, and interrupting the PC wall with each of the excavated trenches; Excavating a portion of the ground between the PC walls until a top portion of the PC wall is exposed; And connecting a plurality of PC slabs to connect the connecting reinforcing bars embedded in both ends of the PC slab to the upper ends of the pair of PC walls by the coupler for connecting the slab reinforcement. Can be achieved as a connection method of a PC slab.

The connecting step may include the steps of: installing a slab supporting section on a side surface of the PC wall; Mounting the PC slab between the pair of PC walls so as to be supported by the slab bearing steel; And connecting the slab reinforcement connecting coupler to the position adjusting member embedded in the side wall of the PC wall and connecting the connecting reinforcing bars embedded in the PC slab to the slab reinforcement connecting coupler by adjusting the position thereof .

In the step of mounting the PC slab, a height adjusting plate may be installed on the slab support forming steel so as to adjust the height thereof, and the PC slab is mounted.

Also, after connecting the slab reinforcement connecting coupler to the slab reinforcement connecting coupler, the PC wall reinforcement installed and installed at the time of manufacturing the PC wall is connected to the field installed portion reinforcing bar through a coupler for connecting the reinforcing bars to connect the slab reinforcement connecting coupler, Placing the reinforcing bars in the reinforcing bars; Preparing an upper slab by pouring concrete into the site; And after the curing, removing the slab supporting section steel and excavating the inside.

The fifth object of the present invention can be achieved as a modular underground structure wherein an underground structure is constructed by applying the connecting method according to the fourth object.

According to an embodiment of the present invention, it is possible to provide a low-cost and rapid-installation construction method that can be installed without trampling water,

According to an embodiment of the present invention, the precast PC wall and the upper precast slab are used as a strut and a strut for supporting the precast PC wall and the upper precast slab, respectively, The slab can be utilized as a permanent structure of an underground structure.

Further, since the precast upper slab applied to the modular construction according to the embodiment of the present invention is applied, the slab is rotated in the same direction as the direction of the obstacle so as to be able to be installed without any problem in the obstacle section for rapid construction, Mount, and connect.

According to an embodiment of the present invention, the pre-cast upper slab is modularly manufactured for rapid construction, is assembled and assembled in the field, the slab itself acts as a strut for supporting the wall, Respectively.

According to an embodiment of the present invention, a high-quality precast wall and an upper slab are manufactured, and the connection between the module structures is assembled and connected to shorten the air of 50% or more compared with the existing construction method (1 m / day to 2.4 m / ).

In addition, according to one embodiment of the present invention, the precast wall can be used as a main body of an underground structure and an earth retaining wall, and the precast upper slab can be used as a strut, The construction cost can be reduced by more than 10% (20 million won / m → 17.2 million won / m) compared with the construction method.

According to an embodiment of the present invention, it is possible to restore rapid road surface after constructing the upper slab, thereby minimizing the congestion of the road traffic and shortening the air by simplifying and integrating the construction.

According to one embodiment of the present invention, since the upper slab is manufactured by half-precast modularization, construction can be performed irrespective of the presence of obstacle, and the level of the upper slab, Precision steel construction is possible by connecting the PC slabs by the longitudinally oriented tendon, and the upper part of the half-precast slab is installed with the cast concrete on site, thereby improving the strength and waterproof effect, Can be minimized.

According to an embodiment of the present invention, the upper end of the slab (the site of the spot installation) is connected to the reinforcement embedded in the PC wall through the coupler, Slab) is connected and fastened to the slab reinforcement using C-channel and T-bolt embedded in the PC wall, and slab level adjustment can be performed precisely by installing a supporting steel plate and a height adjustment plate at the bottom of the slab .

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it will be appreciated by those skilled in the art that various other modifications and variations can be made without departing from the spirit and scope of the invention, All fall within the scope of the appended claims.

1 is a cross-sectional view of an underground structure to which a conventional earth retaining ball and a ground reinforcement ball are applied,
2 is a sectional view of an underground structure to which a conventional permanent wall method is applied,
FIG. 3A is a cross-sectional view of a modular underground structure using a PC wall to which a support beam is applied, according to an embodiment of the present invention;
FIG. 3B is a partial plan view of an underground structure wall connected with PC walls to which a supporting beam is applied, according to an embodiment of the present invention;
3C is a plan view of a connection portion of a PC wall to which a supporting beam is applied according to an embodiment of the present invention,
3D is a partial plan view of a modular underground structure using a PC wall to which a supporting beam is applied according to an embodiment of the present invention,
3E is a partial side view of a PC wall and a PC slab connection according to an embodiment of the present invention,
FIG. 4 is a flowchart of a top-down construction method of a modular underground structure using a PC wall to which a support beam is applied according to an embodiment of the present invention;
5A is a cross-sectional view of a trench excavated in accordance with one embodiment of the present invention and a PC wall in a trench,
FIG. 5B is a sectional view of the hollow hole auger according to an embodiment of the present invention,
FIG. 5C is a cross-sectional view showing a state in which a support beam (H-file) is in an open state according to an embodiment of the present invention,
FIG. 5D is a cross-sectional view of a state in which the upper part is excavated and the obstacle protection hole is installed according to one embodiment of the present invention,
FIG. 5E is a sectional view of a state in which a PC slab is inserted according to an embodiment of the present invention,
FIG. 5f is a cross-sectional view of the PC slab in a state in which it is mounted according to an embodiment of the present invention;
Figure 5G is a cross-sectional view of a PC slab connected to a PC wall according to an embodiment of the present invention,
FIG. 5H is a cross-sectional view of a state where concrete is laid on the upper side of a PC slab according to an embodiment of the present invention,
Figure 5i is a sectional view of a state in which a road surface is restored in accordance with an embodiment of the present invention,
5J is a cross-sectional view of a state in which a ground under a PC slab is excavated according to an embodiment of the present invention,
FIG. 5K is a cross-sectional view of a state where a lower slab is laid in accordance with an embodiment of the present invention,
FIG. 51 is a cross-sectional view of an underground structure having been completed by removing a support beam (H-file) and grouting the void according to an embodiment of the present invention,
6 is a perspective view of a PC wall to which a supporting beam is applied according to an embodiment of the present invention,
7A is a plan view of a connection portion of a PC wall to which a supporting beam is applied according to an embodiment of the present invention,
7B is a plan view of a connection portion of a PC wall having an elastic body according to an embodiment of the present invention,
7C is a plan view of a connection portion of a PC wall to which a supporting beam is applied according to another embodiment of the present invention,
8 is a flowchart of a method of connecting a PC wall using a supporting beam according to an embodiment of the present invention,
9A is a partial plan view of a guiding wall and a trench in an excavated condition, according to an embodiment of the present invention;
FIG. 9B is a partial plan view of a trench excavated according to an embodiment of the present invention, in which a PC wall is installed;
FIG. 9c is a partial plan view of a state in which a side surface protecting plate is provided and an adjacent portion is trench-drilled in accordance with an embodiment of the present invention;
FIG. 9D is a partial plan view of a PC wall installed according to an embodiment of the present invention in a state where a panel guide is inserted into an insertion groove; FIG.
FIG. 9E is a partial plan view of a state in which a PC wall is installed in an adjacent portion trench according to an embodiment of the present invention; FIG.
FIG. 9F is a partial plan view showing a state in which a panel guide is removed and an index member is inserted according to an embodiment of the present invention. FIG.
FIG. 9G is a partial plan view in a state in which the grooves are grooved and pressurized in the exponent hole of an index member according to an embodiment of the present invention;
9H is a partial partial plan view of a state in which the PC wall connection is repeatedly constructed according to an embodiment of the present invention;
FIG. 9I is a partial plan view showing a state in which cement milk for fixing panels is injected according to an embodiment of the present invention; FIG.
10 is a partial plan view of an underground structure wall to which PC walls to which a supporting beam is applied, according to an embodiment of the present invention;
11 is a flowchart of a method of connecting a PC wall and a PC slab constituting an underground structure according to an embodiment of the present invention,
Figure 12a is a partial side view of a trench excavated in accordance with an embodiment of the present invention, a PC wall embedded in a C-channel is installed in a trench, and an upper ground is excavated,
FIG. 12B is a partial side view of a state in which a slab-supporting section steel is provided on a side of a mounting chuck of a PC wall and a coupler for connecting a slab reinforcement is installed according to an embodiment of the present invention;
FIG. 12C is a partial side view of a state in which a PC slab is mounted on a mounting jaw and a slab supporting section steel according to an embodiment of the present invention;
FIG. 12D is a partial side view of a state in which a slab reinforcement is connected through a coupler for connecting a slab reinforcement and an in-situ reinforced concrete reinforcement is connected through a coupler for connecting a rebar to a site in accordance with an embodiment of the present invention,
FIG. 12E is a partial side view of a state in which the upper part of the PC slab is laid in accordance with an embodiment of the present invention;
12f is a partial side view of a state in which the bottom slab of the PC slab is excavated and the slab supporting slab is removed according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. However, the detailed description of known functions and configurations incorporated herein will be omitted when it may unnecessarily obscure the subject matter of the present invention.

The same reference numerals are used for portions having similar functions and functions throughout the drawings. Throughout the specification, when a part is connected to another part, it includes not only a case where it is directly connected but also a case where the other part is indirectly connected with another part in between. In addition, the inclusion of an element does not exclude other elements, but may include other elements, unless specifically stated otherwise.

Hereinafter, a modular underground structure 100 using a precast (PC) wall 110 to which a support beam is applied according to an embodiment of the present invention, a top-down construction method of the modular underground structure 100, A connection method between the walls 110 and a connection method between the PC wall 110 and the precast (PC) slab 60 will be described.

<Configuration of Modular Underground Structures>

The modular underground structure 100 according to an embodiment of the present invention does not require a separate retaining hole, a ground reinforcement hole, and a strut, and both the wall and the slab are precasted, Rapid construction is possible.

FIG. 3A illustrates a cross-sectional view of a modular underground structure 100 using a PC wall 110 to which a support beam is applied according to an embodiment of the present invention. FIG. 3B is a partial plan view of an underground structure wall to which the PC walls 110 to which the support beams are applied, according to an embodiment of the present invention. 3C is a plan view of a connecting portion of the PC wall 110 to which the supporting beam is applied according to an embodiment of the present invention. FIG. 3D is a partial plan view of a modular underground structure 100 using a PC wall 110 to which a support beam is applied according to an embodiment of the present invention. 3E illustrates a partial side view of the PC wall 110 and PC slab 60 connections according to an embodiment of the present invention.

The modular underground structure 100 according to an embodiment of the present invention is composed of a plurality of PC walls 110, a plurality of PC slabs 60, and a lower slab 70 placed in the field.

3A and 3B, the PC wall 110 according to an embodiment of the present invention includes a body portion 10 having a hollow hole 11 formed in a height direction and a hollow hole 11 And a supporting beam for supporting the body 10, and they are connected to each other in the longitudinal direction at the time of construction.

In addition, the support beams support the body 10 from the ground at the time of construction, and are pulled out after the modular underground structure 100 is constructed and reused. It is preferable that such a supporting beam is composed of H files 40 in a specific embodiment.

As shown in FIGS. 3B and 3C, the PC wall 110 according to an embodiment of the present invention includes a side surface of the body portion 10 at the time of construction, and an adjacent body portion It is understood that the other side surfaces of the base 10 form a shear-key structure so as to be aligned with each other.

In other words, a separation preventing protrusion 12 protruding outward is formed on one side of the body portion 10, and the other side surface of the adjacent body portion 10 is inserted inward to be shaped with the separation preventing protrusion 12 So that the spacing preventing groove 13 is formed.

3C, the PC wall 110 according to the embodiment of the present invention includes an insertion recess 14 formed inwardly in each of the separation preventing protrusion 12 and the separation preventing recess 13, . Therefore, in the state where the body portions 10 are in contact with each other, the index member 20 provided with the exponent hole 21 is installed in the insertion groove 14, The expansion member 22 is grouted and pressurized so that it can be firmly fastened without a space between the PC walls 110.

In addition, each of the opposite ends of the plurality of PC slabs 60 according to one embodiment of the present invention is connected to and coupled to the upper end of the PC wall 110, as will be described later in detail. In addition, the lower slab 70 is placed on the lower side of the plurality of PC walls 110.

3E, the PC wall 110 according to the embodiment of the present invention is formed with a mounting jaw 15 on its upper inner side so that a PC slab (not shown) (60).

As shown in FIGS. 3D and 3E, the PC slab 60 according to the embodiment of the present invention is manufactured by embedding the connecting reinforcing bars 61 at both ends thereof. 3E, the PC wall 110 according to the embodiment of the present invention is manufactured by embedding the position adjusting member 52 on the inner side surface of the mounting jaw 15, (53) is embedded and manufactured.

Therefore, as will be described in detail later, the connecting reinforcing bars 61 embedded in the PC slab 60 at the time of manufacture are mounted on the position adjusting member 52 embedded in the PC wall 110, And the PC wall 110 and the PC slab 60 are connected to each other. In addition, the reinforcing bars 62 for laying the field are laid on the PC slabs 60 by the reinforcing couplers 63 for putting on-the-spot, so that the concrete slabs 60 are laid over the PC slabs 60, do.

In addition, the PC wall 110 and the PC slab 60 of the present invention may have a structure in which a prestress is introduced at the time of manufacture. That is, it may be manufactured by installing the PC wall 110 and the PC slab 60 in a state in which the tension member is pulled in the axial direction before the pouring and introducing tension, or by introducing pretension, or by installing the sheath pipe Tension can also be introduced by inserting a tension member into the sheath tube. And, as will be described later, the PC slab 60 may be manufactured by embedding a plurality of sheath pipes in the width direction in order to longitudinally couple a plurality of PC slabs 60.

<Top-down construction method>

Hereinafter, an overall top-down construction method of a modular underground structure 100 according to an embodiment of the present invention will be described.

At the factory, the above-mentioned plurality of PC walls 110 and the PC slabs 60 are manufactured and transported to the site. FIG. 4 is a flowchart illustrating a method of top-down construction of a modular underground structure 100 using a PC wall 110 to which a support beam is applied according to an embodiment of the present invention.

First, the trenches 9 are excavated on both sides of the ground so as to be separated from each other by a predetermined distance in the width direction, and the body 10 of the PC wall body 110 is interrupted by the excavated trenches 9 (S1). 5A is a cross-sectional view of a trench 9 excavated in accordance with an embodiment of the present invention in which the body 10 of the PC wall 110 is nested.

Then, in order to insert the support beam, the hollow hole auger 8 is bored at the lower side of the body 10 of the PC wall body 110 (S2). 5B is a cross-sectional view of the hollow hole auger 8 according to an embodiment of the present invention.

Next, the supporting lumber is inserted into each of the hollow holes 11 formed in the body 10 of the nascent PC wall 110 to support the PC wall 110 (S3). FIG. 5C is a cross-sectional view showing a state in which the supporting beam (H-file 40) is in an empty state according to an embodiment of the present invention.

A portion of the ground between the PC walls 110 is excavated until a part of the upper end of the body 10 of the PC wall 110 is exposed and the obstacle water protection hole is installed at step S4. FIG. 5D is a cross-sectional view of a state in which the upper part is excavated and the obstacle protection hole is installed according to one embodiment of the present invention.

After a part of the upper ground is excavated, the PC slab 60 is loaded through the transfer equipment (S5). FIG. 5E shows a cross-sectional view of a state in which the PC slab 60 is inserted according to an embodiment of the present invention. Then, the inserted PC slab 60 is rotated to place the PC slab 60 on the top of the PC wall 110 (S6). 5f is a cross-sectional view of the PC slab 60 in a state in which it is mounted according to an embodiment of the present invention.

After the PC slab 60 is mounted on the PC wall 110, both ends of the PC slab 60 are connected to the upper ends of the pair of PC walls 110 (S7). As described later in detail, the slab reinforcement connecting coupler 51 composed of T-bolts is attached to the position adjusting member 52 constituted by the C channel embedded at the time of manufacturing the PC wall 110, So that the connecting reinforcing bars 61 embedded in the PC slab 60 are connected through the slab reinforcing connecting coupler 51. FIG. 5G is a cross-sectional view of the PC slab 60 connected to the PC wall 110 according to an embodiment of the present invention.

Then, the site concrete 66 is placed on the upper side of the connected PC slab 60 to complete the manufacture of the upper slab according to the embodiment of the present invention (S8). That is, as will be described later in detail, reinforcing bars 62 are installed in the field installation portion through the on-site pour connection coupler 63 provided in the PC wall reinforcing bar 53 embedded in the PC wall 110, So that the in-situ concrete 66 is laid on the poured portion. FIG. 5H is a cross-sectional view of the concrete slab 60 placed on the upper side of the PC slab 60 according to an embodiment of the present invention.

When the construction of the upper slab is completed, the road surface is restored by pouring the backing material to the upper side of the upper slab (S9). Figure 5i illustrates a cross-sectional view of a state in which the road surface is restored in accordance with one embodiment of the present invention. Then, in the state where the road surface is restored, the inside of the lower side ground of the constructed upper slab is excavated (S10). 5J shows a cross-sectional view of a state in which a ground under a PC slab 60 is excavated according to an embodiment of the present invention.

Then, the ground is excavated until the lower end of the PC wall 110 is exposed, and then the lower slab 70 is installed by installing the site concrete 66 (S11). 5K is a cross-sectional view of the lower slab 70 in a state where the lower slab 70 is installed according to an embodiment of the present invention.

Finally, the support beam (H-file 40) is removed and the void is grouted to complete the construction of the modular underground structure 100 according to one embodiment of the present invention (S12). FIG. 51 is a cross-sectional view of an underground structure 100 that has been completed by removing a support beam (H-file 40) and grouting the gap according to an embodiment of the present invention.

< PC  How to connect between walls>

Hereinafter, the structure of the PC wall 110 according to an embodiment of the present invention and the connection method between the PC walls 110 in the construction of the above-described modular underground structure 100 will be described with reference to the center Will be described in more detail.

6 is a perspective view of a PC wall 110 to which a supporting beam is applied according to an embodiment of the present invention. 7A is a plan view of a connection portion of a PC wall 110 to which a supporting beam is applied according to an embodiment of the present invention.

6, the PC wall 110 according to an embodiment of the present invention includes a body portion 10 having a hollow hole 11 penetrating in a height direction, And a supporting rigid beam inserted into the body portion 10 to support the body portion 10. Accordingly, a plurality of the body portions 10, into which the supporting beams are inserted, are connected to each other in the longitudinal direction to form a modular wall structure of the underground structure.

As described above, the supporting beams made of the H-piles 40 are pulled out after the underground structure 100 is constructed and reused. 6 and 7A, one side surface of the body portion 10 and the other side surface of the adjacent body portion 10 contacting the one side surface are formed to be in a shape of a shear-key structure .

6 and 7A, the outer side protruding protrusion 12 is formed on one side surface, and the other side surface is provided with a separating preventing protrusion 12 inserted inwardly So that the groove 13 is formed.

As shown in FIGS. 6 and 7A, it can be seen that each of the spacing preventing jaws 12 and the spacing preventing grooves 13 is provided with an insertion groove 14 which is recessed inward. Therefore, in the state where the body portions 10 are in contact with each other, the index member 20 provided with the exponent hole 21 is provided in the insertion groove 14, and the expansive member 21 22 are grouted to press the contacted PC wall 110, thereby firmly connecting the PC walls 110 without a spacing space. 6, a reinforcing mat 27 is provided on one side of the upper surface of the body 10 so that the PC wall 110 and the PC slab 60 can be more firmly pressed and connected to each other. .

7B is a plan view of a connection portion of the PC wall 110 provided with the elastic body 31 according to an embodiment of the present invention. 7B, when the PC wall 110 is manufactured, the elastic body 31 is embedded in one side of the side of the body 10, which is the back side of the PC wall 110, to prevent leakage between the walls, It can be seen that breakage and grouting of the end portion of the wall body 110 can be facilitated.

On the other hand, as shown in FIG. 7B, it can be seen that the elastic sealant 32 injected at the time of construction or the elastic body embedded at the time of construction can be provided on one side of the side of the body portion 10, have. That is, the elastic body 31 embedded in the back side of the PC wall 110 is applied first, and the elastic sealant 32 is inserted or the elastic body is inserted at the opening face side to facilitate the filling of the mortar So that it is possible to effectively prevent the leakage of the wall and increase the waterproof effect.

7B, in order to increase the waterproof effect, it is possible to reduce the friction between the elastic bodies 31 by applying a lubricant to the surface of the elastic body 31 according to the working conditions when the PC wall body 110 is installed. , And then connected to the PC wall body 110 installed in the rear side and pressed to the PC wall body 110 pre-installed by external pressure.

7C is a plan view of a connecting portion of a PC wall 110 to which a supporting beam is applied according to another embodiment of the present invention. The index member 20 provided in the PC wall 110 according to another embodiment of the present invention includes a flat plate portion 23 connected to one side and the other side of the exponent hole 21, And a rubber tube 25 connected to the flat plate portion 23 connected to the other side of the exponent hole 21 and a water pipe 24 connected vertically to the end of the flat plate portion 23 connected to one side of the exponent hole 21 As shown in FIG. A packer 26 is installed in the rubber tube 25.

Hereinafter, a method of connecting the PC walls 110 for constructing the modular underground structure 100 according to an embodiment of the present invention will be described in more detail. 8 is a flowchart illustrating a method of connecting a PC wall 110 using a supporting beam according to an embodiment of the present invention.

First, a plurality of PC walls 110 to which a supporting beam is applied according to an embodiment of the present invention is manufactured at a factory, and then transported to the site. Then, the guide wall 80 is provided and the trench 9 is excavated (S20). FIG. 9A shows a partial plan view of a state in which the guide wall 80 and the trench 9 are excavated according to an embodiment of the present invention.

Then, the body 10 of the PC wall 110 is inserted into the excavated trench 9, and a supporting steel beam is inserted into the hollow hole 11 of the body 10 to cause it to intervene (S21). FIG. 9B is a partial plan view of the trench 9 excavated according to an embodiment of the present invention, with the PC wall 110 installed.

Next, the side wall protection plate 83 is installed on one side of the PC wall body 110 and the trench 9 adjacent to the longitudinal wall is excavated (S22). FIG. 9C is a partial plan view showing a state in which a side surface protection plate 83 is installed and an adjacent portion is excavated by a trench 9 according to an embodiment of the present invention.

Then, one end of the panel guide 81 is inserted into the insertion groove 14 formed on one side of the body 10 of the PC wall 110 (S23). FIG. 9D is a partial plan view of a state in which a panel guide 81 is inserted into an insertion groove 14 of a PC wall 110 installed according to an embodiment of the present invention. The body portion 10 of the PC wall body 110 is inserted into the trench 9 which is excavated at the adjacent portion and the supporting beam is inserted into the hollow hole 11 of the body portion 10 and is interrupted. At this time, the other end of the panel guide 81 installed in the insertion slot 14 of the PC wall 110 is inserted into the insertion slot 14 formed on the other side of the body 10 of the PC wall 110, And the PC wall 110 is inserted into the PC wall 110 (S24). FIG. 9E is a partial plan view of a state in which the PC wall 110 is installed in the adjacent portion trench 9 according to an embodiment of the present invention.

Then, the panel guide 81 is removed, and the index member 20 is inserted into the insertion groove 14 (S25). 9F is a partial plan view showing a state in which the panel guide 81 is removed and the index member 20 is inserted according to an embodiment of the present invention. Next, the expandable member 22 is grouted by the exponent hole 21 of the inserted index member 20 (S26). FIG. 9G shows a partial plan view in a state in which it is grouted and pressurized in the exponent hole 21 of the exponent member 20 according to an embodiment of the present invention.

In this way, the PC wall 110 and the PC wall 110 are repeatedly connected (S27). 9H shows a partial partial plan view of a state in which the connection of the PC wall 110 is repeated in accordance with an embodiment of the present invention. After the connection between the PC walls 110 is completed, the cement milk 82 is injected into the gap between the guide wall 80 and the PC wall 110 (S28) The construction of the underground structure wall is completed. FIG. 9I is a partial plan view showing a state in which the panel fixing cement milk 82 is injected according to an embodiment of the present invention. Finally, after the modular underground structure 100 is constructed, the supporting rigid beam, which is the H-file 40, is pulled out.

< PC  Wall and PC  How to connect slabs>

Hereinafter, a connection method between the PC wall 110 and the PC slab 60 in the tower-down construction method of the modular underground structure 100 using the PC wall 110 to which the support beam is applied will be described with reference to the accompanying drawings Will be described in more detail with reference to FIG.

As described above, the PC wall body 110 is embedded with the PC wall reinforcing bar 53, and the C-channel, which is the position adjusting member 20, is embedded. In addition, the connecting reinforcing bars 61 are embedded in both ends of the PC slab 60.

10 is a partial plan view of an underground structure wall connected with PC walls 110 to which a supporting beam is applied according to an embodiment of the present invention. 10, the PC slab 60 may be constructed by embedding at least one sheath pipe 64 passing through in the width direction at the time of fabrication, and a plurality of PC slabs 60 may be formed in the PC wall 110, It can be seen that tension members 65 are inserted into the respective sheath pipes 64 to tie the PC slabs 60 in the longitudinal direction.

11 is a flowchart of a method of connecting a PC wall 110 and a PC slab 60 constituting an underground structure 100 according to an embodiment of the present invention. A plurality of PC walls 110 and a plurality of PC slabs 60 described above are manufactured and transported to the site.

The trenches 9 are excavated on both sides of the ground so as to be spaced apart from each other by a predetermined distance in the width direction and the PC walls 110 are inserted into the excavated trenches 9 until the upper part of the PC walls 110 is exposed A part of the ground between the PC walls 110 is excavated (S30). 12A shows a partial side view of a state in which the upper ground is excavated, a trench 9 is excavated in accordance with an embodiment of the present invention, a PC wall 110 in which a C-channel is buried is installed in the trench 9, FIG.

12A, the PC wall 110 has a mounting jaw 15 on the inner upper end side, a C-channel as the position adjusting member 52 is embedded on the inner surface side of the mounting jaw 15, It can be seen that the PC wall reinforcing bar 53 is embedded in the inside of the PC wall reinforcing bar 53 and that the on-site pouring coupling coupler 63 is installed on one side of the PC wall reinforcing bar 53.

A slab supporting slab 54 is provided outside the mounting tongue 15 of the PC wall 110 and a height adjusting plate 55 is provided at the upper end of the supporting slab 54 through leveling (S31 ). The slab reinforcement connecting coupler 51 composed of a T-bolt is installed in the position adjusting member 52, which is a C-channel embedded in the PC wall 110. 12B is a partial side view of a state in which a slab supporting section steel 54 is installed on a side surface of a mounting jaw 15 of a PC wall 110 and a coupler 51 for connecting a slab reinforcement is installed according to an embodiment of the present invention FIG.

The PC slab 60 is then inserted to place both ends of the PC slab 60 at the upper end of the slab support forming steel 54 and the mounting tongue 15 (S32). 12C is a partial side view of a state in which the PC slab 60 is mounted on the mounting tongue 15 and the slab supporting steel 54 according to an embodiment of the present invention.

The connecting reinforcing bars 61 embedded at both ends of the PC slab 60 are connected to the upper ends of the pair of PC walls 110 by the slab reinforcing coupler 51 at step S33. That is, a coupler 51 for connecting the slab reinforcement is installed in the position adjusting member 52 embedded in the inside of the PC wall 110, and the connecting reinforcing bars embedded in the PC slab 60 are connected to the slab reinforcement For example, a coupler 51 for connecting the light sources. In addition, reinforcing bars 62 are connected to the field-inserted reinforcing bar coupling coupler 63 to reinforce the reinforcing bars in the field casting parts. 12D is a perspective view of the reinforcing bars 61 connected to each other through the coupler 51 for connecting the slab reinforcing bars according to an embodiment of the present invention, And FIG. 6 is a partial side view of a state in which the connection is established.

Then, the upper slab is manufactured by placing the concrete 66 in the laid-in-place cast part (S34). 12E is a partial side view of the PC slab 60 laid over it according to an embodiment of the present invention. Finally, after curing, the slab supporting section steel 54 is removed and the inside is excavated (S35). 12f is a partial side view of a state in which the lower ground of the PC slab 60 is excavated and the slab supporting slab 54 is removed according to an embodiment of the present invention.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. It is to be understood that such modified embodiments are within the scope of protection of the present invention as defined by the appended claims.

1: Conventional underground structures
2: earth retaining ball
3: Ground reinforcement ball
4: Strap
5: Field-mounted upper slab
6: Submerged lower slab
7: Underground continuous wall body
8: hollow hole auger
9: Trench
10:
11: hollow hole
12:
13:
14: Insert groove
15: Mounting chin
20: Index member
21: Exponent
22: Expansive material
23:
24:
25: Rubber tube
26: Packer
27: Reinforcing mat
31: elastomer
32: Elastic sealant
40: H-file
51: Coupler for slab reinforcement connection
52: Position adjusting member
53: PC wall reinforcement
54: Slab support steel
55: height adjustment plate
60: PC slab
61: Reinforcing bar
62: Field reinforced steel
63: Coupler for on-site installation
64: Shuzukan
65: Tension material
66: Field cast concrete
70: Lower slab
80: guide wall
81: Panel Guide
82: Cement milk
83: side plate
100: Modular underground structure using PC wall with supporting beam
11: PC wall

Claims (22)

In a construction method of an underground structure,
A plurality of PC walls and a PC slab are manufactured and transported to the site;
Excavating the trenches on both sides of the ground so as to be spaced apart in the width direction and interrupting the body portion of the PC wall to each excavated trench;
Supporting the PC wall by interposing a supporting beam into each of the hollow holes formed in the body portion;
Excavating a portion of the ground between the PC walls until a top portion of the body portion is exposed;
Placing a plurality of PC slabs and connecting both ends to a pair of PC wall top sides;
Restoring the road surface, excavating the inside of the lower side ground of the installed PC slab, and installing the lower slab; And
And removing the supporting beam,
A position adjusting member is embedded at the time of manufacturing the PC wall, a coupler for connecting the slab reinforcing bars is embedded in the upper inner side,
A connecting reinforcing bar is embedded at both ends of the PC slab when the PC slab is manufactured,
Wherein the connecting reinforcing bar is connected to the position adjusting member by the slab reinforcing connecting coupler whose position is adjusted, and wherein the connecting reinforcing bar is connected to the position adjusting member.
The method according to claim 1,
Wherein the supporting beam is an H-file, and wherein the supporting beam is a H-file.
The method according to claim 1,
After the step of interrupting the body portion of the PC wall,
Further comprising the step of drilling a hollow hole auger on the bottom side ground of the buried body portion.
The method according to claim 1,
Wherein at least one of the PC wall and the PC slab is introduced with a prestressing method.
delete delete delete The method according to claim 1,
Wherein the PC wall reinforcement is embedded in the inner wall of the PC wall so that the end of the PC wall protrudes from the inner wall of the upper wall of the PC wall when the PC wall is manufactured.
9. The method of claim 8,
After the connecting step,
Further comprising the step of connecting the field-placing reinforcing bar and the PC wall reinforcing bar by a coupler for on-site putting connection, placing a reinforcing bar for field-placing on the upper side of the PC slab, and pouring the upper side of the PC slab. A Top - Down Construction Method of Modular Underground Structures Using PC Beams with Steel Beams.
9. The method of claim 8,
Wherein the position adjusting member is constituted by a C-channel. 6. A method of top-down construction of a modular underground structure using a PC wall to which a supporting beam is applied.
The method according to claim 1,
Wherein the slab reinforcement connecting coupler is composed of a T-bolt. &Lt; RTI ID = 0.0 &gt; 11. &lt; / RTI &gt;
delete delete delete delete delete In underground structures,
A modular underground structure using a PC wall to which a support beam is applied, the construction being implemented by the construction method according to any one of claims 1 to 4 and 8 to 11.
delete delete delete delete delete

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