KR102202598B1 - Double wall structure for top-down construction and top-down structure construction method therewith - Google Patents

Abstract

It relates to a double wall for the top-down construction method of constructing an underground structure by inserting and inserting a double wall into a trench-shaped excavation hole formed in the ground, and then pouring and synthesizing wall concrete in the ground, and a top-down structure construction method using the same. , The double wall body for the top-down construction method is a double wall formed by spaced apart from each other the front wall and the rear wall by an integral section steel that extends in a state where one side is integrally formed on the front wall and the other side is integrally formed with the rear wall. For the section steel, the integral section steel extending at least one or more from the inside of the front wall and the rear wall to the outside is located under the excavation hole, and the front and rear walls are located above the excavation hole, and the front and rear walls are made of wall concrete. They are made to synthesize each other in the ground.

Description

Double wall for top-down construction method and construction method of top-down structure using the same {DOUBLE WALL STRUCTURE FOR TOP-DOWN CONSTRUCTION AND TOP-DOWN STRUCTURE CONSTRUCTION METHOD THEREWITH}

The present invention relates to a top-down construction method for a double wall and a top-down structure using the same. More specifically, the double wall is inserted into the trench-shaped excavation hole formed in the ground, and then wall concrete is poured and synthesized in the ground to construct an underground structure, a double wall for the top-down construction method, and a top-down structure construction method using the same. It is about.

1A is a diagram showing a construction diagram of a conventional SLIT method in which a conventional underground roadway is constructed using a precast wall.

In this SLIT method, after manufacturing the side wall member 40, which is a precast member, the precast top plate structure 50 is first installed, and in preparation for the construction of the open-ended underground structure, the above-ground part is completed early and the interior is not installed. It can be said that it is a technology to build an excavated underground structure through excavation and construction.

The side wall member 40 used in this SLIT method is an underground structure by connecting a supporting pile during construction and an H-beam 42 that resists side earth pressure on the bottom surface of the precast member 41 to each other in the ground. The sidewalls of the underground structure are constructed, which has the advantage of being relatively easy to transport and constructing compared to the case where all of the sidewalls of an underground structure are constructed with a precast member, thereby reducing cost.

However, the precast member 41 and the H beam 42 are manufactured and connected to each other by using an anchor bolt and a connecting steel plate. Actually, such a connection operation has a limitation in quality control, and the precast member ( When the size of 41) increases, there is a problem that the workability is also deteriorated due to the enlargement of the equipment.

1B shows a method of constructing a wall structure using a conventional precast front and rear wall.

That is, the precast front and rear walls (10,20) produced in the factory and brought into the site are laid on the floor of the site so that the connecting reinforcing bars (14, 24) face upward,

Next, it can be seen that the reinforcing bars (30:31, 32, 33) inside the wall previously examined are placed in the front and rear walls of the precast lying down (10, 20).

This means that even if the height of the precast front and rear walls (10,20) is more than 2m, the reinforcement inside the wall (30:31,32,33) is placed in the vertically erected precast front and rear walls (10,20). It is disclosed that the work is very difficult.

Accordingly, the inner wall reinforcement 30 is not laid on the precast front and rear walls 10 and 20 that are erected in a vertical state, and the inner wall reinforcement 30 is laid on the precast front and rear walls 10 and 20 lying on the floor. By reinforcing the internal wall reinforcing bar 30, the efficiency of the reinforcing work of the inner wall reinforcing bar 30 can be increased, and in particular, the manufacturing time can be reduced.

Accordingly, when the reinforcing work of the inner wall reinforcement 30 on the precast front and rear walls 10 and 20 is completed, the precast rear wall 10 and 20 is overturned on the precast front wall 10, and the connection reinforcement is It can be seen that (14, 24) are connected to each other using a coupler and an internal connection reinforcement (12).

Accordingly, the precast front wall 10 and the precast rear wall 10 and 20 connected to each other are vertically raised, and the precast front wall 10 and the precast rear wall 20 connected to each other are arranged horizontally apart from each other. and,

Inner wall concrete (not shown) is poured so that the inner wall reinforcement is buried so that the final wall structure construction can be completed.

At this time, the inner wall reinforcement (30:31,32,33) is an auxiliary reinforcement for connecting the precast front and rear walls (10,20) to each other. There was a limitation that it was difficult to secure efficiency.

In addition, the precast rear wall (10, 20) is upside down on the precast front wall (10), and the connection reinforcement (14, 24) is connected to each other using a coupler and internal connection reinforcement (12). Equipment must be provided separately, because it adopts a method of making the front and rear walls in a precast method without using a formwork and then setting them up and down to connect them. Therefore, manufacturing and providing such equipment for wall setting actually requires a lot of cost and reliability.

Korean Patent No. 10-1379305 (Name of invention: Method for manufacturing wall structure using precast front wall and precast rear wall, Publication date: March 28, 2014) Korean Patent Registration 10-1568194 (Name of invention: PC member connection method and PC structure constructed using it) Republic of Korea Patent Publication 10-2010-0106274 (Name of invention: dry joint structure for prefabricated beam-column structure and construction method according to it)

Thus, the top-down construction method can overcome the limitations of manufacturing, transportation, and construction due to the construction of the entire double wall as a precast member, while the top-down construction method double wall can be manufactured more economically and efficiently. It is a technical task to solve the provision of the double wall for the down construction method and the construction method of the top-down structure using the same.

Furthermore, the present invention provides a more efficient and economical production of the double wall for the top-down construction method, and by optimizing the cross section structurally, a more economical double wall for the top-down construction method and a top-down structure construction method using the same It is a technical problem to be solved.

In order to achieve the above object, the present invention

It is constructed to be inserted into the excavation hole formed in the ground, and the front wall and the rear wall are spaced apart from each other by an integral section steel with one side integrally formed on the front wall and the other side integrally formed with at least one of the rear wall. As a formed double wall, the integrated section steel extends from the inside of the front wall and the rear wall to the outside so that it is located under the excavation hole, and the front wall and the rear wall are located above the excavation hole, and the front and rear walls are made of wall concrete. To be synthesized with each other in the ground,
The front wall and the rear wall are (a) a T-shaped wall portion formed of a reinforcing rib formed on one side of the vertical wall portion and a reinforcing rib from the inside of the vertical wall portion and are formed to protrude to the outside, so that the ends extend to the inside of the rear wall. Providing a front wall comprising a; to allow the concrete for the rear wall (C1) by pouring and curing the front wall and the rear wall to be separated from each other to be synthesized integrally shaped steel; (b) In addition to installing both side barriers so that the front wall is located on the inside, the brackets are installed so that the brackets can be detached from the integrated steel and both sides of the front wall, and a wall form for manufacturing the rear wall is installed on the upper surface of the bracket. Making it supported; And (c) pouring and curing concrete (C1) for the rear wall on the upper surface of the wall formwork to form a rear wall integrally synthesized with the integral steel of the front wall; including, the front wall is manufactured by a precast method. , The rear wall that is integrated and integrated with the front wall provides a double wall for the top-down construction method that is manufactured by the cast-in-place concrete method.

In addition, in order to achieve the above object, the present invention

(a) providing a double wall for the top-down method; (b) By forming excavation holes spaced apart in the transverse direction, and inserting a double wall for the top-down method in the excavation hole, the integral section steel is formed under the excavation hole, and the front wall and the rear wall are integrated with each other by the integral section steel. Positioning it above the excavation hole; (c) placing wall concrete (C2) in a spaced space between the front wall and the rear wall inserted in the excavation hole and synthesizing each other in the ground; including, the front wall and the rear wall of step (a) T-shaped wall portion formed of reinforcing ribs formed on one side of the vertical wall portion; And it is formed to protrude from the inside of the vertical wall portion to the outside via a reinforcing rib so that the end can be extended to the inside of the rear wall, so that the front wall and the rear wall are separated from each other by placing and curing concrete for the rear wall (C1). Providing a front wall including; In addition to installing both side barriers so that the front wall is located on the inside, the brackets are installed to be detachable on the integrated steel and both sides of the front wall, and a wall form for making a rear wall is installed on the upper surface of the bracket to be supported. step; And pouring and curing concrete (C1) for the rear wall on the upper surface of the wall formwork to form a rear wall integrally synthesized with the integral steel of the front wall; Including, the front wall is manufactured by a precast method, and the front wall is produced by a precast method. The rear wall that is synthesized and integrated with provides a top-down structure construction method using a double wall for the top-down construction method that is manufactured by the cast-in-place concrete method.

The double wall body for the top-down construction method and the construction method of the top-down structure using the same according to the present invention are free by replacing the precast member used in the conventional SLIT construction method and the side wall member by the H-beam with the front and rear walls synthesized from integral steel. There is no need for a separate connection between the cast member and the H-beam, and since the underground wall is made of a double wall, it is possible to fundamentally solve the problem caused by an increase in self-weight as the size increases.

In addition, the double wall for the top-down method according to the present invention is not premised on the work of separately connecting the reinforcing bars, unlike the prior art, because the front wall and the rear wall are synthesized by one-piece steel during the manufacturing process. You will be able to solve the problem.

Furthermore, the double wall for the top-down construction method and the construction method of the top-down structure using the same according to the present invention are prepared by precasting the front wall by precast method, and the rear wall composited and integrated with the front wall by making in-situ concrete method. It is more economical and efficient by optimizing the equipment for wall setting according to the manufacturing method only,

The double wall for the top-down construction method according to the present invention and the construction method for the top-down structure using the same can reliably ensure the longitudinal structural integrity of the double wall for the top-down construction method, and the precast front wall and precast rear wall Since the cross section of the can be optimized, it can be manufactured so that its own weight is not large.

1a is a construction diagram of a conventional SLIT method,
1B is a construction view of a wall structure using a conventional precast front and rear wall,
2a, 2b, 2c, 2d, and 2e are views of the manufacture of a double wall for the top-down method of the present invention,
Figure 3 is a longitudinal view of the double wall body for the top-down method of the present invention),
Figure 4 is a construction view of the underground structure (A) constructed using the double wall for the top-down method of the present invention,
Figures 5a, 5b and 5c is a top-down structure construction method flow chart using a double wall for the top-down method of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and similar reference numerals are assigned to similar parts throughout the specification.

Throughout the specification, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components unless otherwise stated.

[Double wall body 100 for the top-down method of the present invention]

The double wall body 100 for the top-down construction method of the present invention first excavates a trench (excavation to form vertical holes continuously in the longitudinal direction with a constant width) in the secured work space by excavating the ground at a certain depth, and then trench excavation. Insert the double wall 100 for the top-down method of the present invention into the excavation hole 310, and in the space between the front wall 110 and the rear wall 120 of the double wall 100 for the top-down method Wall concrete (C2) is poured to synthesize the front wall 110 and the rear wall 120 in the ground.

Accordingly, the precast top plate structure 200 is mounted between the tops of the top-down construction method synthesized in the ground, and after the construction is carried out, the ground is completed early by filling the dug space back. .

Accordingly, the base plate 130 is additionally constructed while excavating the ground between the precast upper plate structure 200 and the double wall body 100 for the top-down method to finally complete the underground structure (A).

The double wall body 100 for the top-down construction method of the present invention is manufactured in the form of a double wall body using the front and rear walls 110 and 120 in the precast member 41 compared to the conventional SLIT construction method, and the H beam 42 Unlike the conventional SLIT method, the H-beam 12 is incorporated into the precast member 41 by being integrated with the front and rear walls 110 and 120 and extending from the inside of the front and rear walls to the outside. While solving the problem of quality control by connecting them separately, a difference basically arises in that the front and rear walls are made to be combined with each other in the ground.

Accordingly, in the double wall body 100 for the top-down method of the present invention, as shown in FIG. 2E, the front wall 110 and the rear wall 120 are integrally synthesized with each other by an integral section steel 112, and the integral section steel ( 112) is an integral type steel 112 that is integrated with the front wall 110 and the rear wall 120 by using an extension longer than the extension length of the front wall 110 and the rear wall 120. It can be seen that it is formed so as to be extended, and its manufacturing method is as follows.

First, in the integrated section steel 112, the end of the section steel drawn from the inside of the front wall 110 extends to the inside of the rear wall 120, and the front wall and the rear wall are formed by placing and curing the wall concrete (C2). While being synthesized by, in synthesizing the front wall 110 and the rear wall 120 with each other, it is meant to avoid the need to separately connect the section steel in the field,

To this end, the present invention is manufactured in a manner in which the front wall 110 and the rear wall 120 are combined with each other using an integral section steel 112 using the wall formwork 270.

That is, the front wall is produced by a precast method, and the rear wall that is synthesized and integrated with the front wall is produced by the cast-in-place concrete method.

As a result, the present invention independently manufactures the front wall 110 and the rear wall 120 by a precast method, and the internal reinforcement drawn from the front wall 110 and the rear wall 120 is coupled to each other by a coupler, It can be said that it is possible to solve the problem of decrease in workability and workability by adopting a method of connecting by welding or the like.

In addition, the integral section steel 112 has the entire length extended compared to the front and defecation walls 110 and 120 while the integral section steel 112 is set to the lower part of the excavation hole, and the front and rear walls 110 and 120 above the excavation hole. do.

2A, 2B, 2C, 2D, and 2E are diagrams illustrating the double wall body 100 for the top-down method.

Specifically, the method of manufacturing the double wall body 100 for the top-down method according to the present invention is, first, as shown in FIG. 2A, that the front wall body 110 is manufactured in advance by a precast method and is integrated into the floor G of the manufacturing site. It can be seen that (112) is set to face upward. At this time, the front wall 110 is a designation for convenience and refers to a front or rear wall in the double wall 100 for the top-down method.

This front wall 110 is configured to include a T-shaped wall portion 111 and an integral type steel 112.

It can be seen that the T-shaped wall part 111 is a reinforced concrete wall part having a T-shaped cross section and is formed of a vertical wall part 111a formed with a protruding reinforcing rib 111b to minimize its own weight. .

It can be seen that the vertical wall portion 111a is a vertical plate member and is formed with a constant thickness and height.

At least one of the reinforcing ribs 111b may be formed to protrude from one side of the vertical wall part 111a, and the vertical wall part 111a to reinforce the bending and shear stiffness of the vertical wall part 111a. It can be seen that it extends over the entire height of ).

It can be seen that one side (flange) of the one-piece steel 112 is buried inside the vertical wall portion 111a, and the other side protrudes upward to the outside via a reinforcing rib 111b.

In addition, by using I-shaped steel as the integral type steel 112, the vertical wall part 111a is reinforced with the flexural stiffness and the cross-sectional area is larger than that of the reinforcing bars. Is done.

The other side (the other side flange) of the integral member steel 112 is formed to extend to the inner side of the rear wall 120, as shown in FIG. 2D, so that it functions sufficiently as an inner main reinforcement in the rear wall as well, and the other side of the integral member steel 112 The rear wall 120 is combined with the front wall 110 in a manner such that it is buried in the concrete wall C2 to be poured.

The integral type steel 112 is an I-shaped steel with an abdomen formed between both flanges, and is formed only in a continuous or required section along the reinforcing ribs 111b, but extends more than the extension length of the front wall 110 so that the front wall ( 110) It is formed to extend from the inside to the outside.

Accordingly, it can be seen that the integrated section steel 112 is synthesized by integrating the rear wall 120 with the front wall 110 while being integrally formed when the front wall 110 is manufactured.

At this time, the wall formwork 270 is used in order to combine the rear wall 120 integrally with each other using the front wall 110 and the integral section steel 112.

At this time, as shown in FIG. 2B for setting the wall formwork 270, first, both side prevention zones 230 are first arranged in both sides of the front wall 110.

As shown in FIG. 2B, the two side barriers 230 are supported on the floor G of the production floor so that the rear wall 120 can be manufactured as a vertical wall structure having a constant height in consideration of the formation position of the rear wall 120. It is extended to have a certain length so that it is for supporting the wall formwork 270, and a steel frame assembly or the like may be used to enable later dismantling after demolding.

Accordingly, looking at the both side prevention zones 230 as a reference, it can be seen that the front wall 110 is located in the inner side, and at this time, the extension length of both side prevention zones 230 will be formed shorter than that of the integral type steel 112.

At this time, it can be seen that the bracket 240 is installed in the integrated section steel 112 of the front wall 110 and the two side barriers 230 so as to be detachable.

That is, the bracket 240 is on both inner sides (A1) of the both side prevention zones 230 to support the wall formwork 270, as shown in FIG. It is set to have the same height from ),

It can be seen that both inner surfaces (A1) of both side prevention zones 230, L-shaped connection plates in contact with the outer circumferential surfaces of the abdomen of the integral type steel 112 and a reinforcing plate of a triangular cross-section are formed,

It may be installed using fasteners (not shown) such as bolts to be separated from the outer circumferential surfaces of the abdomen of the final both inner side surfaces (A1) and the integral type steel 112.

Next, as shown in FIGS. 2B and 2C, while installing the height adjustment device 260 on the upper surface of the bracket 240, the wall formwork 270 is installed on the upper surface of the height adjustment device 260.

The height adjustment device 260 allows the installation height of the wall formwork 270 to be adjusted, while horizontally sliding the wall formwork 270, from both side barriers 230, the front wall 110, and the rear wall 120. It can be said to be a means of transportation for demolding.

Accordingly, as shown in FIG. 2B, the bracket 240 is formed by including a body portion 262 formed so that the roller 261, which is slidable on the upper surface, is rotatable, and an impression jack 263 integrated on the upper surface of the body portion 262 A number of them are installed on the upper surface of the bracket 240 in the extending direction of the wall mold 270.

Accordingly, by operating the impression jack 263, it is possible to adjust the installation height of the supporting wall formwork 270, and the wall formwork 270 is horizontally slid using the roller 261 to move the wall formwork 270 It becomes possible to demold while moving.

This wall formwork 270 is for synthesizing the front wall 110 and the rear wall 120 by using the integral type steel 112 by pouring concrete (C1) for the rear wall, as shown in FIGS. 2C and 2D. What is manufactured based on the cross-sectional shape of the wall 120 is formed by setting it horizontally on the upper surface of the height adjusting device 260 installed on the upper surface of the bracket 240.

For example, reinforcing bars for forming the rear wall 120 are placed inside the wall formwork 270, and concrete for the rear wall (C1) is poured into the rear wall 120 by using the integral steel 112 of the front wall 110. You can synthesize it.

Accordingly, it can be seen that the other side of the integrated section steel 112 extends to the inner side of the rear wall 120, so unlikely, assembling work such as reinforcing bars to connect the front wall 110 and the rear wall 120 to each other is required. No need,

The integral type steel 112 is a main reinforcing bar, which eliminates the need to place a large amount of separate main reinforcing bars between the front wall 110 and the rear wall 120,

It can be a very advantageous form for lifting and buckling of the double wall by the front wall 110 and the rear wall 120, which may occur during installation, and securing the bending stiffness of the double wall 100 for the top-down method, shearing and It also enables effective resistance of pouring pressure,

It also serves as a connecting steel connecting each other while sufficiently securing a space between the front wall 110 and the rear wall 120.

Thus, as shown in Figure 2e, the bracket 240 installed on the integral section steel 112 is also separated, and the front wall 110 and the rear wall 120 are combined with each other by the integral section steel 112 located inside the two side barriers 230. Can be lifted immediately.

At this time, it can be seen that the rear wall 120 is also formed in the same manner as the front wall 110. That is, as shown in Fig. 2e, the rear wall 120 is also composed of a vertical wall portion 121a having a reinforcing rib 121b formed as a reinforced concrete wall portion of a T-shaped cross section,

It can be seen that the vertical wall portion 121a is also formed with a constant thickness and height as a vertical plate member,

The reinforcing rib 121b is also formed to protrude from one side of the vertical wall portion 121a to reinforce the bending stiffness of the vertical wall portion 121a.

At this time, since the integral section steel 112 is formed so that the other side is buried inside the vertical wall portion 121a, and one side is formed to extend to the inside of the front wall 110 via a reinforcing rib 121b, the inner main reinforcement bar is also in the front wall. While functioning sufficiently, it is combined with the front wall 110.

In this way, when they are combined with each other by the integral section steel 112, it is possible to assume that the front wall 110 and the rear wall 120 are structurally integrated. Therefore, the cross section of the front wall 110 and the rear wall 120 It can be more optimized, and the amount of rebar used can be greatly reduced, thereby reducing its own weight, making it possible to make economical and stable production and construction.

In this way, the reduction of the self-weight by optimizing the cross section of the front wall 110 and the rear wall 120 influences the capacity and manufacturing cost of the facility by connecting the front wall 110 and the rear wall 120 to each other.

In addition, it is possible to significantly reduce the amount of main reinforcing bars that must be laid between the front wall 110 and the rear wall 120 according to the use of the integral section steel 112,

In addition, the integral section steel 112 combines the rear wall 120 with the front wall 110 in a state integrally formed with the front wall 110, but extends a certain length from the end surfaces of the front wall 110 and the rear wall 120 It can be seen that it is formed to be.

In addition, as shown in Fig. 2e, the integral type steel 112 is not exposed to the outside by being covered by the coated concrete (B), and this coated concrete (B) serves as the bracket 240 and the exposed integral type steel 112 ), it can be seen that, for example, two integrated section steels 112 are installed, so that the number of installations along the length of the double wall 100 for the top-down method is free. .

Accordingly, the double wall body 100 for the top-down construction method of the present invention is the front wall and the rear wall by wall concrete (C2) after being inserted into the excavation hole so that the integrated section steel faces downward for the construction of the underground wall of the underground structure. Is to be synthesized in the ground so that the H-beam 42 is connected to the precast member 41, which is not in the form of a double wall, and the H-beam 42 is inserted into the excavation hole so that it faces downward. You can see that there is a difference.

[Longitudinal synthesis of the double wall body 100 for the top-down method according to the present invention]

Figure 3 is a top-down method according to the present invention shows a longitudinal view of the double wall body 100.

In the state in which the integral section steel 112 formed to extend in the longitudinal direction from the inside of the front wall and the rear wall is combined with the front wall 110 and the rear wall 120, each of the lengthwise extension lengths in manufacturing, unmanagement and installation And the height (length direction) is bound to be limited.

In addition, in the double wall body 100 for the top-down method, the integral section steel 112 is set inside the excavation hole 310 and the front wall 110 and the rear wall 120 synthesized with each other by the integral section steel 112 are In a state spaced apart from each other, it is constructed to be set on the top of the excavation hole 310 formed in the ground.

Thus, as shown in Figure 3, each of the double wall for the top-down method 100 is a role of connecting the front wall and the rear wall to each other in the longitudinal direction while the wall concrete (C2) is poured and cured between the front wall and the rear wall. Is done.

At this time, there may be a problem that it is difficult to resist shear force with only the integral section steel 112, and as shown in FIG. 3, a reinforcing bar assembly 180 for shear resistance is additionally disposed in the space between the vertical wall parts 111a and 121a to provide bending stiffness and especially In this way, it is possible to have an effect on increasing the shear force.

[Top-down structure construction method using double walls for the top-down method of the present invention]

Figure 4 shows a flow chart of a top-down structure construction method using a double wall for the top-down method of the present invention.

That is, the underground structure (A) is, after first constructing the double wall 100 for the top-down method so as to be spaced apart from each other in the horizontal direction, and then the front of the double wall 100 for the top-down method with wall concrete (C2). After the wall 110 and the rear wall 120 are combined in a longitudinal direction, and the precast top plate structure 200 is mounted to be placed between the front wall 110 and the rear wall 120, the precast top plate In a state in which the upper part of the structure 200 is backfilled to be restored, and the ground part allows the passage of vehicles, etc., the base plate 130 is constructed while additionally excavating the ground under the precast upper plate structure 200. The underground Guju Mall will be constructed in a top-down method.

Specifically,

First, as shown in FIG. 5A, an excavation hole 310 through which the double wall body 100 for the top-down method can be vertically inserted is formed. For example, the excavation hole 310 is formed through trench excavation so that the double wall body 100 for the top-down method can be inserted.

Since the excavation hole 310 is not large in width, it is advantageous to maintain the cavity wall, but it is preferable to fill the filler material such as cement milk to maintain the cavity wall, and to form between the excavation holes 310, a trench excavator may be used. .

Accordingly, the excavation space is continuously constructed in the longitudinal direction, and for the construction of a two-row underground structure, at least three or more are spaced apart in the horizontal direction, and of course, in the case of a one-row underground structure, two excavation spaces need to be formed.

Accordingly, a pre-prepared double wall body 100 for the top-down method is inserted into the excavation hole 310 so that the sides of the front and rear walls are in contact with each other in the longitudinal direction.

Accordingly, the double wall body 100 for the top-down method is not integrated and synthesized in the longitudinal direction.

Thus, as shown in FIG. 5B, wall concrete (C2) is placed in the space between the front wall 110 and the rear wall 120 of the double wall 100 for the top-down method, so that the front wall 110 and the rear surface The walls 120 are synthesized with each other,

Accordingly, the front wall 110 and the rear wall 120 can be combined with each other in the longitudinal direction, so in the present invention, a shear key and a shear groove are not formed to connect the front wall 110 and the rear wall 120 in the longitudinal direction. Can not,

As shown in Fig. 3, a reinforcing bar assembly 180 for shear resistance is additionally disposed in the space between the vertical wall portions 111a and 121a of the front wall and the rear wall, and synthesized with the wall concrete (C2) to achieve overall bending stiffness and, in particular, shear force. You will be able to have an effect on promotion.

At this time, the double wall 100 for the top-down method is formed to be spaced apart from each other in the horizontal direction for the second row space, so that the vehicle is inevitably controlled during the construction of the double wall 100 for the top-down method. But

Once the construction of the double wall 100 for the top-down method is completed by the wall concrete (C2), the precast top plate structure 200 carried in the precast factory is immediately installed so that the vehicle can pass immediately. do.

The precast upper plate structure 200 may be mounted on the upper surface of the double wall body 100 for the top-down method, and then rigidly coupled to each other to be integrated, and this is not shown, but upper plate finished concrete, fastening rods, etc. may be used.

Separately, the precast top plate structure 200 excavates only a certain depth downward between the ground between the double walls 100 for the top-down method, as shown in FIG. 3B, and the precast top plate structure 200 is used for the top-down method. It is constructed in such a way that both ends of the double wall 100 are supported between the front wall and the upper surface of the rear wall.

Accordingly, in a state in which the excavation space above the precast upper plate structure 200 installed in the double wall 100 for the top-down method is restored by filling back, the above-ground part is allowed to pass.

Accordingly, as shown in FIG. 5C, the support force due to the vehicle load acting on the backfilled excavation space above the precast upper plate structure 200 can be secured by the precast upper plate structure 200.

Accordingly, structural safety is secured in further excavation of the lower ground of the precast upper plate structure 200, and as the lower excavation space is formed, the bottom plate 130 is excavated to the location where the bottom plate 130 is constructed, and thus a type of top-down method is used. It can be seen that it is implemented.

Accordingly, the bottom plate 130 is reinforced between the exposed double walls 100 for the top-down construction method, and is constructed in an in-situ concrete method, so that the final underground structure construction can be completed, and at this time, the integrated steel ( It can be seen that 112 extends further downward than the bottom plate 130.

Accordingly, it can be seen that the ground under the bottom plate can support the earth pressure at the bottom of the underground wall as it is, so that even if the double wall body 100 for the top-down method is manufactured by optimizing it to be slimmer, structural safety due to the earth pressure can be secured.

Accordingly, when the construction of the double wall body 100 for the top-down construction method of the final two-row structure is completed, the inner side of the double wall body 100 for the top-down construction method is completed, such as packaging.

The above description of the present invention is for illustrative purposes only, and those of ordinary skill in the art to which the present invention pertains will be able to understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as being distributed may also be implemented in a combined form.

The scope of the present invention is indicated by the claims to be described later rather than the detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. do.

100: Double wall for top-down construction
110: front wall
120: rear wall
112: integral section steel
200: precast top plate structure
310: excavator

Claims (10)

It is constructed to be inserted into the excavation hole 310 formed in the ground, and extends in a state where one side is integrally formed with the front wall 110, and the other side is integrally formed with at least one or more integrally formed with the rear wall 120. ) As a double wall formed by spaced apart the front wall and the rear wall,
The integrated section steel 112 extends from the inside of the front wall and the rear wall to the outside so that it is located below the excavation hole, and the front wall and the rear wall are located above the excavation hole, and the front wall and the rear wall are in the ground by wall concrete. Make them synthesized together,
The front and rear walls 110 and 120 may include: (a) a T-shaped wall portion 111 formed of reinforcing ribs 111b formed on one side of the vertical wall portion 111a; And it is formed protruding from the inside of the vertical wall portion to the outside via a reinforcing rib so that the end can be extended to the inside of the rear wall 120, so that the front wall and the rear wall are mutually formed by pouring and curing concrete for the rear wall (C1). Providing a front wall body 110 including; (b) In addition to installing both side barriers 230 so that the front wall 110 is located inside, the bracket 240 is detached from the integrated section steel 112 of the front wall 110 and both side barriers 230 Installing the bracket 240 so as to be supported by installing a wall mold 270 for manufacturing the rear wall 120 on the upper surface of the bracket 240; And (c) pouring and curing concrete (C1) for a rear wall on the upper surface of the wall formwork 270 to form a rear wall 120 integrally synthesized with the integral steel 112 of the front wall 110; Including, the front wall 110 is produced by a precast method, the rear wall body 120 is synthesized and integrated with the front wall is a top-down construction method that is produced by the in-situ concrete method. The method of claim 1,
The front wall and the rear wall (110, 120)
T-shaped wall portions 111 and 121 formed of reinforcing ribs 111b and 121b formed on one side of the vertical wall portions 111a and 121a; And it is formed protruding from the inside of the vertical wall portion to the outside via a reinforcing rib so that the end can be extended to the inside of the rear wall 120, so that the front wall and the rear wall are mutually formed by pouring and curing concrete for the rear wall (C1). Including, the integrated steel is formed to extend to the outside by being integrally formed inside the front wall and the rear wall, but to be covered by the coated concrete so that it is not exposed to the outside. Double wall for top-down construction. delete The method of claim 1,
The double wall structure 100 using the integrated section steel manufactured in step (c) is lifted and set vertically, and between the vertical wall portions 111a and 121a of the front wall 110 and the rear wall 120 Arranging the shear resistance reinforcing bar assembly 180 in the space; And placing wall concrete (C2) so that the integral section steel 112 and the reinforcing bar assembly 180 for shear resistance are buried inside the front wall 110 and the rear wall 120 so that they are integrated with each other; further comprising Double wall for top-down construction. (a) providing a double wall body 100 for the top-down method according to claim 1;
(b) By forming the excavation hole 310 spaced apart in the transverse direction, and inserting the double wall 100 for the top-down method into the excavation hole 310, the integrated section steel 112 is placed under the excavation hole 310 In, the step of allowing the front wall and the rear wall integrated with each other by the integral steel to be positioned above the excavation hole 310;
(c) placing concrete wall (C2) in the spaced space between the front wall 110 and the rear wall 120 inserted into the excavation hole 310 and synthesizing each other in the ground; and,
The front wall and the rear wall (110,120) of the step (a) may include a T-shaped wall part 111 formed of reinforcing ribs 111b formed on one side of the vertical wall part 111a; And it is formed protruding from the inside of the vertical wall portion to the outside via a reinforcing rib so that the end can be extended to the inside of the rear wall 120, so that the front wall and the rear wall are mutually formed by pouring and curing concrete for the rear wall (C1). Providing a front wall body 110 including; In addition to installing the two side barriers 230 so that the front wall 110 is located inside, the bracket 240 is detachable from the integrated section steel 112 of the front wall 110 and the two side barriers 230. Installing and installing a wall mold 270 for manufacturing the rear wall 120 on the upper surface of the bracket 240 to be supported; And forming a rear wall 120 integrally synthesized with the integral section steel 112 of the front wall 110 by pouring and curing concrete (C1) for the rear wall on the upper surface of the wall formwork 270. , The front wall 110 is manufactured by a precast method, and the rear wall 120 is synthesized and integrated with the front wall is a top-down structure construction method using a double wall for the top-down method, which is manufactured by a cast-in-place concrete method. The method of claim 5,
After step (c) above,
Installing the precast top plate structure 200 on the upper surface of the front wall and the rear wall synthesized in the ground by the wall concrete (C2), and backfilling the excavated space above the precast top plate structure 200 Top-down structure construction method using a double wall for the top-down method further comprising. The method of claim 6,
After backfilling the excavated space above the precast upper plate structure 200, the bottom plate 130 between the double walls 100 for the top-down method by excavating the lower ground of the precast upper plate structure 200 Top-down structure construction method using a double wall for the top-down construction method to further form. The method of claim 5,
The step (c),
A reinforcing bar assembly 180 for shear resistance in the space between the vertical wall portions 111a and 121a of the front wall 110 and the rear wall 120 by lifting the double wall 100 for the top-down method and setting it vertically. ), a double wall for the top-down method to be integrated with each other by pouring wall concrete (C2) so that the reinforcing bar assembly 180 for shear resistance is embedded between the front wall 110 and the rear wall 120. Top-down structure construction method used. The method of claim 5,
In the step (b), the excavation hole 310 excavates a trench in the work space secured by excavating the ground, and inserts the double wall 100 for the top-down method into the excavation hole 310 excavated in the trench. Top-down construction method using double walls for the top-down construction method. delete

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