KR102649945B1 - Underground structure with precast concrete pile and composite diaphragm wall and the construction method thereof - Google Patents

Abstract

By using precast hollow columns, one end of the upper deck is installed to be continuously supported in the longitudinal direction, while the other end of the upper deck can be installed continuously and integrated into the main row composite pile wall in the longitudinal direction. , Precast hollow columns and column-type composite pile walls that enable more economical and rapid construction of the middle column (A1), both side walls (A2), and upper plate (A3) of the underground structure (A) in a top-down manner. An underground structure using and its construction method are disclosed.

Description

Underground structures and construction methods using precast hollow columns and column-type composite pile walls {UNDERGROUND STRUCTURE WITH PRECAST CONCRETE PILE AND COMPOSITE DIAPHRAGM WALL AND THE CONSTRUCTION METHOD THEREOF}

The present invention relates to an underground structure using precast hollow columns and a column-type composite pile wall and a method of constructing the same. More specifically, one end of the upper deck is installed to be continuously supported in the longitudinal direction using precast hollow columns, and the other end of the upper deck is also continuously integrated into the main row composite pile wall in the longitudinal direction. The precast hollow column and main section enable more economical and rapid construction of the middle column (A1), both side walls (A2), and upper plate (A3) of the underground structure (A) using a top-down method. It relates to underground structures using thermal composite pile walls and their construction methods.

Figure 1a is an illustration of the installation of a girder 40 using a conventional connection support member 20.

That is, the piles 61 are vertically inserted into the ground in a horizontal direction, and the connection support member 20 is inserted into the head of the pile 61 so that it is seated on the step 63 of the head of the pile 61. install it,

It can be seen that the end of the girder 40 is installed on the step of the connection support member 20 so that the bottom is supported.

That is, in order to construct a slab bridge, the girder is mounted between the piles 61 using steps, but the piles 61 do not have a large cross-sectional area, so the connection support member 20 is attached to the head of the piles 61. You can see that additional installation is being done to penetrate.

Accordingly, it can be seen that the connection support member 20 is a support bracket on which a step 63 is formed and is used to support the end of the girder 40, and a member made of a hexagonal cross-section using a precast method can be used.

Figure 1b shows an example of the installation of the head and girder 11 of a conventional column structure 1.

The column structure (1) is a girder in which an inner ribbed steel pipe (3) with the upper surface exposed is embedded in the hollow upper surface, and an outer ribbed steel pipe (15) protrudes downward from the inner ribbed steel pipe (3). (11) is set,

It can be seen that the girder 11 can be installed on the head of the column structure 1 in such a way that the outer rib-attached steel pipe 15 is inserted into the inner rib-attached steel pipe 3.

In the end, in order to install the girders (40, 11), which are horizontal members, on the column structure (1), which is a vertical structure, and the pile (61), a connection support member (20) in the form of a support bracket or a vertical connection steel pipe combination structure is used in the form of a precast member. It can be seen that can be adopted.

However, there has been no specific introduction on how to quickly and efficiently structurally integrate the upper plate, middle section, and bottom plate of an underground structure using the conventional top-down method.

Republic of Korea Patent Publication No. 10-2013-0109298 (Title of invention: Connection structure of upper and lower PC columns for buildings with non-sleeve combination structure, Publication date: October 8, 2013) Japanese Patent Publication No. 20002-146720 (Title of invention: Joint structure of column and girder, Publication date: May 22, 2002) Republic of Korea Registered Utility Model No. 20-0422840 (Name of invention: Prefabricated slab bridge installed by mounting H-shaped girders on connecting support members inserted on grid-type pile columns, Publication date: July 31, 2006)

Accordingly, in the present invention, one end of the upper deck is continuously formed on the precast hollow column of the underground structure in the longitudinal direction, and the other end of the upper deck is connected using the opening of the main row composite pile wall to continue in the longitudinal direction. After installation, a precast hollow column and column-type composite pile wall that can simply structurally integrate the middle column (A1), both side walls (A2), and top plate (A3) of the underground structure (A) by pouring concrete. The technical problem to be solved is to provide underground structures and construction methods using .

The underground structure using the precast hollow column and column-type composite pile wall of the present invention to achieve the above task is constructed by lifting and inserting into the central excavation hole (h1) formed by excavating the ground (G), and central excavation. A precast hollow pile is constructed so as to be supported on the bottom of the hole (h1), and the upper part including the upper surface of the hollow part is located inside the central excavation hole (h1); and is inserted into the exposed hollow part of the precast hollow pile A precast hollow including; a precast insertion bracket installed so that each hollow insertion portion is inserted into a hollow portion formed on the upper surface of the precast hollow pile, and the hollow insertion portion is supported on the bottom of the hollow portion and is supported on the upper surface of the precast hollow pile; pillar part; A column-type composite pile wall that is inserted and installed by forming both side wall excavation holes (h2) in the ground (G) by combining the concrete pile part including the PHC pile and the upper part of the concrete pile part with the steel pipe part at the top and bottom; And one end is supported on the bottom of the upper surface of the bracket body of the precast insert bracket continuously formed in the longitudinal direction, and the other end is connected to an opening formed in the steel pipe of the main row composite pile wall and precast by pouring concrete (C). It is to include a deck for the upper plate that is integrated with the cast hollow column and the column-type composite pile wall.

The method of constructing an underground structure using a precast hollow column and a column-type composite pile wall of the present invention to achieve the above problem includes (a) both side wall excavation holes (h2) and both side wall excavation holes (h2) in the ground (G). ), the central excavation hole (h1) is constructed at a certain depth while being continuous in the longitudinal direction, and a column-type composite pile wall is inserted into both side wall excavation holes (h2) and a precast hollow pile is inserted into the central excavation hole (h1). ordering step; (b) Excavate the ground (G) downward between the two side wall excavation holes (h2) to expose the steel pipe portion of both side wall excavation holes (h2) and the precast hollow pile of the central excavation hole (h1). and connecting the precast insertion bracket to the hollow portion of the exposed precast hollow pile to continuously construct the precast insertion bracket in the longitudinal direction; and (c) installing a deck for the upper plate continuously in the longitudinal direction using precast insertion brackets of the steel pipe portion and precast hollow column of the main-row composite pile wall, and pouring concrete (C) to form a main-row composite pile wall, It includes the step of integrating the precast hollow column and the deck for the upper deck in the longitudinal direction, wherein an opening formed to expose the steel pipe part of the column-type composite pile wall, the upper surface of the precast insertion bracket, and the upper surface of the deck for the upper deck are provided with a constant By pouring concrete (C) in thickness, the upper deck is structurally integrated with the steel pipe part of the column-type composite pile wall and the precast insertion bracket of the precast hollow column part.

According to the present invention, after construction using precast hollow piles and column-type composite pile walls in the ground, the top plate and bottom plate can be structurally integrated in the inner excavation space (S), so it is possible to install separate temporary facilities as in the past. This makes it possible to construct underground structures using piles very quickly, efficiently, and economically.

According to the present invention, for the construction of underground structures, the intermediate column (A1) is constructed using factory-made concrete, so it is possible to secure economic feasibility compared to the case of using steel as the main member, making it a more efficient precast hollow column. It becomes possible to provide underground structures and construction methods using column-type composite pile walls.

According to the present invention, both side walls of the underground structure are constructed by structurally integrating the deck for the upper deck with the precast hollow column and the main row composite pile wall, while securing economic efficiency by using main row composite pile walls, thereby constructing the underground structure. It is possible to provide an underground structure and a construction method using precast hollow columns and column-type composite pile walls that can be constructed more stably and quickly.

According to the present invention, it is possible to structurally integrate both side walls (A2) and top plate (A3) of an underground structure in the longitudinal and transverse directions using a transverse reinforcing bar assembly, so that the bottom plate (A4) and both side walls (A2) are constructed. Integrated construction is possible using the concrete pile part of the row-type composite pile wall, allowing for more economical construction of underground structures.

Figure 1a is an example of girder installation using a conventional connection support member,
Figure 1b is an example of the installation of the head and girder of a conventional column structure,
Figure 2a is an illustration of the construction of an underground structure (A) using a precast hollow column, a column-type composite pile wall, a top deck, and a bottom plate of the present invention;
Figures 2b, 2c, 2d, and 2e are examples of the configuration of the precast hollow column, column-type composite pile wall, upper deck, and bottom plate of the present invention,
Figures 3a, 3b, 3c, 3d, 3e, and 3f are flowcharts of the construction method of an underground structure (A) using a precast hollow column, a column-type composite pile wall, a top deck, and a bottom plate of the present invention.

Below, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts not related to the description are omitted, and similar parts are given similar reference numerals throughout the specification.

Throughout the specification, when a part is said to “include” a certain element, this means that it may further include other elements rather than excluding other elements, unless specifically stated to the contrary.

[Underground structure (A) using the precast hollow column (100) and column-type composite pile wall (200) of the present invention]

Figure 2a is a construction example of an underground structure (A) using the precast hollow column 100, the column-type composite pile wall 200, the upper deck 300, and the bottom plate (A4) of the present invention, Figure 2b; Figures 2c, 2c, 2d and 2e show examples of the configuration of the precast hollow column 100, the column-type composite pile wall 200, the upper deck 300, and the bottom plate (A4) of the present invention. It was done.

Referring to FIGS. 2A and 3B, the underground structure (A) is constructed with a plurality of precast hollow column parts 100 spaced apart in the longitudinal direction between the column-type composite pile walls 200 on both sides,

One end of the upper deck 300 is continuously supported in the longitudinal direction using the precast hollow column 100,

The other end of the top deck 300 is connected to the opening 230 formed in the steel pipe portion 210 of the double row composite pile wall 200 and is also continuous in the longitudinal direction,

By pouring concrete (C), the precast hollow column (100), the two-row composite pile wall (200), the upper deck (300), and the bottom plate (A4) are structurally integrated,

The top-down method is used to integrate and construct the middle column (A1), both side walls (A2), top plate (A3), and bottom plate (A4) of the underground structure (A).

In particular, while securing economic efficiency and constructability by using the precast hollow column 100 manufactured by the precast method,

The main row composite pile wall 200 is composed of a concrete pile part 220 including a PHC pile at the lower part and a steel pipe part 210 at the upper part of the concrete pile part 220.

The steel pipe part 210 connects the other end of the top deck 300 to the opening 230 of the steel pipe part 210 so that it is structurally integrated in the longitudinal and lateral directions by pouring concrete (C). Compared to the case of using only the steel pipe portion 210, the steel pipe portion 210 can be effectively used for structural integration of the upper plate deck 300 while securing economic feasibility.

For this purpose, referring to Figure 2a, the underground structure (A) using the precast hollow column 100 and the main row composite pile wall 200 consists of the precast hollow column 100 and the main row composite pile wall 200. , it is formed to include a top deck 300 and a bottom plate (A4).

First, referring to FIGS. 2A and 2B, the precast hollow column portion 100 includes a precast hollow pile 110 and a precast insertion bracket 120, and is the middle column portion (A1) of the underground structure (A). ) plays a role,

Referring to Figure 2a, one end of the top deck 300 is continuously supported in the longitudinal direction on the upper surface of the precast insertion bracket 120, and referring to Figure 2e, the bottom plate of the underground structure (A) is attached to the lower part. It plays a role in ensuring that (A4) is formed as a whole.

Accordingly, referring to FIG. 2b, the precast hollow pile 110 is manufactured as a reinforced concrete product in advance at a factory, and it can be seen that it is formed by a precast method with a square cross-section, but the cross-sectional shape can be changed. It is used when it is extended to a certain length.

Economic efficiency can be secured by not using steel. A hollow part 111 is formed downward at a certain depth on the upper surface, and the lower part is formed with an extended end part 112, enabling stable load support.

Referring to FIG. 3A, this precast hollow pile 110 is constructed by lifting and penetrating the central excavation hole (h1) formed by excavating the ground (G), and the extended tip portion 112 is inserted into the central excavation hole (h1). ) It can be seen that it is constructed to be supported on the bottom surface, and the upper part including the upper surface of the hollow part 111 is located inside the central excavation hole (h1).

Accordingly, the precast hollow pile 110 can be self-supporting by penetrating into the central excavation hole (h1) during construction, so speed and safety can be secured when installing a large number of them so that they are spaced apart in the longitudinal direction. Referring to Figure 3b, the precast hollow pile 110 can be installed vertically. It serves to support the cast insertion bracket (120) from the bottom,

The hollow insertion portion 122 of the precast insertion bracket 120 is inserted into the central excavation hole (h1) and is inserted downward into the exposed hollow portion 111 of the precast hollow pile 110 to support it. It can be seen that the bracket body portion 121 of the cast insertion bracket 120 is in contact with each other in the longitudinal direction and serves to enable continuous construction.

Also, referring to Figure 2b, it can be seen that the sleeve 113 is embedded in advance in the lower part of the precast hollow pile 110 so that the bottom plate connecting reinforcement can be connected to connect the bottom plate A4. Referring to 2e, the bottom plate connecting reinforcing bars 114 are fastened to the sleeve 113 in the longitudinal and transverse directions so that the bottom plate connecting reinforcing bars are embedded inside the bottom plate (A4), thereby forming the bottom plate (A4) and the precast hollow pile (110). It can be seen that these can be integrated with each other.

Referring to FIG. 2b, the precast insertion bracket 120 is a reinforced concrete product manufactured in advance at a factory, for example, using a precast method with a hexagonal cross-section, and is used in the hollow portion 111 of the precast hollow pile 110. ) to be inserted and installed.

That is, at least two hollow insertion parts 122 in the form of vertical members are integrally installed on the bottom of the bracket body 121.

According to Figure 2b, the bracket body 121 is formed of a precast concrete body, and the hollow portion 122 inserted into the bottom of the bracket body 121 is made of H-type steel, etc. and is inserted into the hollow portion 111. It can be seen that the construction can be done so that it is integrated with non-shrinkage mortar.

Referring to FIG. 2b, each of the hollow insertion parts 122 is inserted into the hollow part 111 formed on the upper surface of the precast hollow pile 110, so that the hollow part insertion part 122 is formed on the bottom of the hollow part 111. While supported, the precast insertion bracket 120 can be installed to be supported on the upper surface of the precast hollow pile 110,

Referring to FIG. 2A, the upper surface of the bracket body 121 serves to support the bottom surface of one end of the upper deck 300.

Normally, when constructing an underground structure (A) using the top-down method, the deck is supported on the middle column (A1), so when manufacturing with steel, steel brackets are often used to support the ends of the deck. When using a bracket, the manufacturing cost is somewhat expensive and the welding work is inevitably repeated, which reduces constructability and workability.

In the case of the present invention, in order to construct the middle column (A1), the precast hollow pile (110) is installed in the central excavation hole (h1) to prevent conduction,

Since the precast insertion bracket 120 is simply integrated and constructed using the exposed hollow part 111 of the precast hollow pile 110, the advantages of the precast method can be utilized without deteriorating constructability and workability.

Since the top deck 300 is directly supported on the upper surface of the precast insert bracket 120, a protruding support ridge that supports the deck end formed to protrude on the outer peripheral surface of the conventional precast hollow pile 110 can also be formed. Since there is no need for it, convenience in production can be secured.

In addition, two or more hollow insertion parts 122 of the precast insertion bracket 120 are inserted into the hollow part 111 of the precast hollow pile 110 at the same time, and the side of the bracket body 121 is Because a plurality of precast insertion brackets 120 are installed continuously in the longitudinal direction so as to contact each other,

It can be seen that the bracket body portion 121 supporting one end of the upper deck 300 is formed continuously in the longitudinal direction, enabling stable and rapid installation of the upper deck 300.

Accordingly, referring to FIG. 3b, the precast hollow pile 110 is inserted entirely into the central excavation hole h1 and then excavated downward through the ground G, using the exposed inner excavation space S. It can be seen that the bracket body portion 121 of the precast insertion bracket 120 is exposed from the central excavation hole h1 to the upper inner excavation space S to enable installation of the upper plate deck 300. there is.

Referring to FIG. 2a, the main row composite pile wall 200 is composed of a concrete pile part 220 including a PHC pile at the lower part and a steel pipe part 210 at the upper part of the concrete pile part 220 so as to be composited up and down. By forming both side wall excavation holes (h2) in the ground (G) and allowing penetration, the function of both side walls (A2) of the underground structure (A) is maintained.

In this way, the reason why the upper and lower steel pipe parts 210 are used as the upper part of the concrete pile part 220 is because economic feasibility can be secured when the concrete pile part 220 uses a ready-made product such as a PHC pile. Instead of installing the other end of the top deck 300 to simply support it,

As shown in Figure 2a, an opening 230 is formed on the outer peripheral surface of the steel pipe portion 210, and concrete (C) is poured into the opening 230 so that the other end of the upper deck 300 is integrated into the opening 230 to form a structural structure. Because it is integrated, using the steel pipe part 210 is good for manufacturing and constructability.

Accordingly, the concrete pile part 220 and the steel pipe part 210, which are ready-made products such as PHC piles, can be connected to each other at the factory in advance and penetrate into both side wall excavation holes (h2) as a unit, and a plurality of concrete pile parts 220 can be installed. It is okay to connect the and steel pipe parts 210 to each other and insert and install a plurality of them into both side wall excavation holes (h2) at once.

Also, referring to FIG. 2C, a waterproof reinforcement plate 240 can be further formed between the steel pipe portion 210 and the side of the steel pipe portion 210.

In addition, the opening 230 is cut in advance at the area where the upper plate deck 300 will be connected to the steel pipe portion 210 and sealed using a cover, and then the sealed opening 230 is exposed by excavating the ground (G). Once done, the cover can be removed to expose the opening 230 so that concrete (C) can be poured.

In addition, referring to FIG. 2D, a steel support ridge 250 can be further formed on the outer peripheral surface of the lower steel pipe portion 210 of the opening 230 to support the bottom surface of one end of the upper deck 300. , By placing concrete (C) by arranging the necessary reinforcing bars while the top deck 300 is connected to the opening 230,

When the concrete (C) poured inside the upper deck deck and the steel pipe portion 210 is cured, the column-type composite pile wall 200 and the precast hollow column portion 100 can be structurally integrated with each other.

Accordingly, with reference to FIGS. 2C and 2D, the deck for the upper plate 300 is the main row composite pile wall 200.

A method of structurally integrating in the longitudinal and transverse directions by placing concrete (C) by placing the necessary reinforcing bars while connected to the opening 230 formed in the steel pipe portion 210 is as follows.

Referring to FIGS. 2C and 2D, the steel pipe portion 210 on the upper part of the concrete pile portion 220 allows steel pipes to penetrate the ground (G) adjacent to each other, and moves the ground (G) between adjacent steel pipes downward from the ground. By installing a waterproof reinforcement plate 240 between the exposed outer peripheral surfaces of the steel pipes penetrated during excavation, continuity and waterproofness in the transverse direction can be secured.

In addition, the steel pipe portion 210 must be connected to the upper plate deck 300 in advance before penetration, so that the outer circumferential surface is cut in a certain area up and down in consideration of the outer circumferential region, and then the built-in connecting reinforcing bar 211 is welded so that it can be connected from the outside. It is installed on the inner side of the steel pipe in advance by such methods.

Accordingly, referring to FIG. 2D, since the opening 230 formed by the incision is inevitably a vulnerable structure, a reinforcing plate 212 in the form of a vertical plate is added so that the built-in connecting reinforcing bar 211 can be located in between. It is installed on the inner side of the steel pipe.

In addition, when penetrating the column-type composite pile wall 200, soil, etc. may flow into the opening 230, so the cover 213 is installed by welding to seal the opening 230.

Referring to FIGS. 2D and 3B, the cover 213 is exposed by excavating the ground, and then the welded portion is removed to expose the built-in connecting reinforcing bar 211 and the reinforcing plate 212.

Accordingly, referring to FIG. 2D, the built-in connecting reinforcing bar 211 exposed by removing the cover 213 is connected to the connecting reinforcing bar 214 for the upper plate.

At this time, the connecting reinforcing bar 214 for the upper plate can be connected longitudinally in the field by the built-in connecting reinforcing bar 211 and a coupler, and can be arranged to extend to the upper part of the upper deck deck 300.

In addition, it can be seen that the transverse reinforcing bar assembly 215, which can be formed continuously in the transverse direction, is used.

Referring to FIG. 2D, it can be seen that this transverse reinforcing bar assembly 215 is a rectangular parallelepiped-shaped reinforcing bar assembly and is arranged in the transverse direction by successively passing through the openings 230 exposed in the transverse direction.

The deck extension reinforcing bar 216 is positioned to extend inside the transverse reinforcing bar assembly 215 from the upper plate deck 300, which is seated on the steel support ledge 250 formed below the opening 230 of the steel pipe portion 210. and connect it.

The exposed built-in connecting reinforcing bar 211 is connected to the connecting reinforcing bar 214 for the upper plate so that the upper plate (A3) is connected in the longitudinal direction,

In a state where the transverse rebar assembly 215 and the deck extension rebar 216 seated in the opening 230 are connected to successively pass through the transversely exposed openings 230,

Concrete (C) is placed inside the opening (230) and the top plate so that the built-in connecting reinforcing bar (211), reinforcing plate (212), connecting reinforcing bar (214) for the top plate, transverse reinforcing bar assembly (125), and deck extension reinforcing bar (216) are embedded. It can be seen that the main row composite pile wall 200 and the top deck 300 are continuous in the longitudinal and transverse directions and are structurally integrated by pouring and curing the upper part of the deck 300 to a certain thickness.

Referring to Figure 2a, the top deck 300 has one end supported on the upper surface of the bracket body 121 of the precast insert bracket 120 formed continuously in the longitudinal direction, and the other end is a column-type composite pile wall. It is connected to the opening 230 formed in the steel pipe part 210 of (200) and is integrated with the precast hollow column part 100 and the column-type composite pile wall 200 by pouring concrete (C) to form an underground structure (A) It serves as a top plate (A3) integrated with the middle pillar (A1) of ) for construction.

In other words, a precast member manufactured in advance in the factory using concrete in the form of a horizontal plate is used, and concrete (C) is poured from the upper surface to a certain thickness to construct the upper plate (A3).

According to FIGS. 2C and 2D, the other end of the upper plate deck 300 is a steel support ridge formed on the outer peripheral surface of the lower steel pipe portion 210 of the opening 230 formed in the steel pipe portion 210 of the column-type composite pile wall 200. In a state where it is supported by (250), concrete is poured inside the opening 230 on the top of the upper deck 300.

The other side end is formed with the opening 230 formed in the steel pipe portion 210 of the main row composite pile wall 200 and the precast hollow column 100 and the main row composite pile wall 200 by pouring concrete (C). It can be seen that it has the effect of being integrated in the longitudinal and transverse directions.

Accordingly, the top deck 300 is installed with one end continuous in the longitudinal direction on the upper surface of the bracket body 121 of the longitudinally continuous precast insertion bracket 120,

The other side end is installed continuously in the longitudinal direction using the opening 230 formed in the steel pipe portion 210 of the longitudinally continuous column-type composite pile wall 200.

The deck for the top plate (300) is also installed continuously in the longitudinal direction, and the underground structure (A) consists of a middle column by the precast hollow column (100), both side walls (A2) by the main row composite pile wall (200), It can be seen that the upper plate (A3) of the upper plate deck 300 can be structurally integrated with each other in the longitudinal and transverse directions by pouring concrete (C).

Next, referring to FIG. 2e, a method of constructing the bottom plate (A4) by integrating it with the longitudinally continuous column-type composite pile wall 200 is as follows.

Referring to Figure 2a, since the lower part of the column-type composite pile wall 200 is a concrete pile part 220, an opening 230 is formed to install a transverse rebar assembly 215 or a top plate deck 300. Instead of using a deck, the bottom plate (A4) will be constructed with cast-in-place concrete.

Accordingly, the sleeve 113 is buried in advance so that it is exposed in the area where the bottom plate (A4) must be constructed in the concrete pile portion 220, and the bottom plate connecting reinforcing bar 114 is fastened to the sleeve 113 to extend it, and then the bottom plate is connected. Concrete (C) is poured so that the reinforcing bars 114 are buried, thereby integrating the bottom plate (A4) with the column-type composite pile wall 200 including the concrete pile portion 220.

At this time, an internal reinforcing plate 115 in the form of a horizontal plate ring is installed inside the concrete pile part 220 so that the exposed sleeve 113 is integrated with the concrete pile part 220 in the form of a hollow pile, and the sleeve 113 is exposed. You can see that it can be installed.

Accordingly, it can be seen that in the present invention, the bottom plate (A4) is constructed using cast-in-place concrete, and the top plate (A3) is constructed using the deck 300 for the top plate.

[Construction method of underground structure (A) using precast hollow column 100 and main row composite pile wall 200 of the present invention]

Figures 3a, 3b, 3c, 3d, 3e and 3f show a flowchart of the construction method of an underground structure (A) using the precast hollow column 100 and the column-type composite pile wall 200 of the present invention. It was done.

The method of constructing an underground structure (A) using the precast hollow column 100 and the column-type composite pile wall 200 is a method of constructing an underground structure (A) such as an underpass or an underground tunnel using a top-down method. .

That is, the column-type composite pile wall 200 is penetrated into both side wall excavation holes (h2) formed in the ground (G), and the precast hollow column is inserted into the central excavation hole (h1) between both side wall excavation holes (h2). By penetrating (100) and excavating the ground between the two side wall excavation holes (h2) downward,

A top plate (A3) is constructed using the top deck deck 300 and concrete (C) on the exposed column-type composite pile wall 200 and the precast hollow column portion 100,

In addition, by excavating the ground between the two side wall excavation holes (h2) downward and constructing the bottom plate (A4) using concrete (C) on the exposed precast hollow column portion (100) and column-type composite pile wall (200). The underground structure (A) will be constructed.

Accordingly, both side walls (A2) of the underground structure (A) are constructed by finishing the steel pipe portion 210 of the main row composite pile wall 200 with a concrete panel (finishing material), and the upper plate (A3), the bottom plate (A4), and the middle It can be seen that the column part (A1) is finally formed by pouring concrete (C), so the use of steel is minimized during construction.

Accordingly, according to FIG. 3A, a central excavation hole (h1) is constructed in the ground (G) between both side wall excavation holes (h2) and both side wall excavation holes (h2) at a certain depth while being continuous in the longitudinal direction, and the both side walls are It can be seen that the column-type composite pile wall 200 is penetrated into the excavation hole (h2), and the precast hollow pile 110 is penetrated into the central excavation hole (h1).

First, the main row composite pile wall 200 inserted into both side wall excavation holes (h2) is constructed so that the main row composite pile wall 200 is exposed to the upper part of both side wall excavation holes (h2) to serve as an earth block around the ground surface. This has the advantage of not requiring separate temporary facilities.

When using the main row composite pile wall 200, which is a composite of the steel pipe part 210 and the concrete pile part 220 at the top and bottom, the area where the earth pressure occurs is formed as the steel pipe part 210, and the relatively earth pressure is formed as the steel pipe part 210. In areas where this does not occur significantly, economic feasibility can be secured.

Referring to FIGS. 2C and 2D, this column-type composite pile wall 200 has an opening 230, a waterproof reinforcement plate 240, a steel pipe portion 210 formed with a steel support sill 250, and a concrete pile portion 220. ), and the upper plate (A3) is integrated with both side walls (A2) in the longitudinal and transverse directions using the steel pipe portion 210, and is also integrated in the longitudinal and transverse directions using the middle column portion (A1). The middle part of the upper plate (A3) is integrated, and both side walls (A2) and the bottom plate (A4) are integrated using the concrete pile part 220.

That is, the steel pipe portion 210 forms an opening 230 to have the effect of integrating the other end of the upper plate deck 300 in the longitudinal and transverse directions, and is structurally integrated using concrete (C). The waterproof reinforcement plate 240 prevents soil, etc. from flowing between the steel pipes, and the steel support ledge 250 is installed so that the other end of the upper plate deck 300 is supported on the steel pipe portion 210. It becomes possible.

The concrete pile part 220 can be made using a PHC pile, etc., and the steel pipe part 210 is integrated at the top.

The concrete pile part 220 and the steel pipe part 210 formed as one body are installed in the both side wall excavation holes (h2), and the opening part 230 is sealed with the cover 213, and then both side wall excavation holes are installed. When exposed by ground excavation between (h2), the opening 230 is exposed by removing the cover 213 to construct the column-type composite pile wall 200.

In addition, the precast hollow column 100 includes a precast hollow pile 110 and a precast insertion bracket 120, and serves as the middle column portion A1 of the underground structure A.

According to Figure 3a, the precast hollow pile 110 is first constructed in the central excavation hole (h1).

This precast hollow pile 110 has a hollow part 111 formed downward at a certain depth on the upper surface, and the lower part is formed with an expanded tip 112 and is manufactured to have a certain extension length, and the central It is constructed by lifting and inserting into the excavation hole (h1).

It can be seen that the extension tip 112 is supported on the bottom of the central excavation hole h1, and the upper part including the upper surface of the hollow part 111 is located inside the central excavation hole h1.

Accordingly, the precast hollow pile 110 of the precast hollow pile 110 is inserted into the central excavation hole (h1) during construction and can stand on its own, so that speed and safety can be secured when installing a large number of them so that they are spaced apart in the longitudinal direction. do.

Next, as shown in Figure 3b, the ground (G) between the two side wall excavation holes (h2) is excavated downward in the ground (G) to form the steel pipe portion 210 of both side wall excavation holes (h2) and the central excavation hole (h1). The precast hollow pile 110 of the precast hollow column 100 is exposed, and the precast insertion bracket 120 of the precast hollow column 100 is exposed. The hollow part of the precast hollow pile 110 is exposed. By inserting into (111), the precast insertion bracket (120) is continuously constructed in the longitudinal direction.

By excavating downward the ground (G) between the two side wall excavation holes (h2), the underground structure (A) is constructed using a top-down method, and the steel pipe portion 210 and the hollow portion of the precast hollow pile 110 are constructed. (111) is excavated to a depth where it is exposed. As a result, it is possible to secure the inner excavation space (S) where the top deck 300 can be installed.

At this time, referring to Figure 2a, the precast insertion bracket 120 is installed by inserting into the exposed precast hollow pile 110, and has a hollow insertion portion 122 in the form of a vertical member on the bottom of the bracket body 121. ) are installed integrally, and serve to continuously support one end of the upper deck 300 in the longitudinal direction.

Accordingly, there is no need to install separate steps and brackets on the precast hollow pile 110, and rapid construction is possible because the precast insertion bracket 120 manufactured by the precast method is used.

That is, each of the hollow insertion parts 122 is inserted into the hollow part 111 formed on the upper surface of the precast hollow pile 110, and the hollow part insertion part 122 is supported on the bottom of the hollow part 111 to insert the precast. The bracket 120 can be installed to be supported on the upper surface of the precast hollow pile 110, so that the upper surface of the bracket body 121 serves to support the bottom surface of one end of the upper deck 300.

In addition, as the ground (G) between the two side wall excavation holes (h2) is excavated downward in the ground (G), the steel pipe portion 210 is exposed, so the opening 230 formed in consideration of the installation location of the upper plate deck 300 is exposed by removing the cover 213.

Next, as shown in FIGS. 3C and 3D, the upper plate deck 300 is installed using the steel pipe portion 210 of the column-type composite pile wall 200 and the precast insertion bracket 120 of the precast hollow column portion 100. are installed continuously in the longitudinal direction, and concrete (C) is poured to integrate the column-type composite pile wall 200, the precast hollow column 100, and the upper deck 300 in the longitudinal direction.

That is, according to FIG. 3C, the other end of the top deck 300 is inserted into the opening 230 exposed to the steel pipe portion 210 of the column-type composite pile wall 200 so that it is supported by the steel support ledge 250. As much as possible, one end of the upper deck 300 is supported on the upper surface of the precast insertion bracket 120 of the precast hollow column 100 and is continuously installed so as to contact the upper deck 300 in the longitudinal direction. ,

According to Figure 3d, concrete (C) is poured to a certain thickness on the opening 230, the upper surface of the precast insertion bracket 120, and the upper surface of the upper deck 300, and the upper deck 300 is formed as a main row composite pile wall. It can be seen that the steel pipe portion 210 of (200) and the precast insertion bracket 120 of the precast hollow column portion 100 are structurally integrated.

Next, as shown in Figures 3e and 3f, when the upper plate (A3) of the underground structure (A) is constructed, the upper part of the underground structure (A) is covered with soil to enable traffic opening, and excavated downward to build the underground structure (A) ) to construct the bottom plate (A4).

Since the top plate (A3) serves as a strut that connects and supports the upper ends of the two column-type composite pile walls 200, the upper part of the top plate (A3) can be opened to traffic through covering soil, and the steel pipe portion 210 is It is recovered by making an incision above the upper plate (A3).

Accordingly, referring to FIG. 2b, the bottom plate connecting reinforcing bar 114 is pulled out through the sleeve 113 at the lower part of the steel pipe portion 210 and the precast hollow column portion 100, which were additionally exposed by excavating downward of the upper plate (A3). After that, the bottom plate (A4) is constructed by pouring concrete (C), and the finishing materials such as panels for finishing the joints and steel pipe parts (210) required for the underground structure (A) are installed and finished, and the upper surface of the bottom plate (A4) is paved. By forming layers, it functions as an underground structure.

According to Figures 2b and 2c, the bottom plate (A4) is an underground structure by pouring concrete (C) into the lower part of the precast hollow column part 100 and the concrete pile part 220 of the column-type composite pile wall 200. It can be seen that the middle pillar in (A) serves as a lower plate that is integrated with the lower part of both side walls.

Since the lower part of the precast hollow column part 100 and the concrete pile part 220 of the column-type composite pile wall 200 is formed of concrete, continuous construction can be performed in the longitudinal and transverse directions using a rotating rebar assembly, etc. I do it. Accordingly, according to FIGS. 2B and 2C, it can be seen that a central divider, a utility outlet, etc. are installed on the base plate A4.

As a result, it can be seen that the underground structure (A) of the present invention is constructed with the middle column (A1), both side walls (A2), and the upper plate (A3), without separate digging, etc., and is a double row composite pile wall. It can be seen that the middle pillar (A1), both side walls (A2), upper plate (A3), and bottom plate (A4) are being constructed in order while excavating the ground between (200) downward.

The description of the present invention described above is for illustrative purposes, and those skilled in the art will understand that the present invention can be easily modified into other specific forms without changing the technical idea or essential features of the present invention. will be. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive. For example, each component described as unitary may be implemented in a distributed manner, and similarly, components described as distributed may also be implemented in a combined form.

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

100: Precast hollow column
110: Precast hollow pile
111: hollow part 112: extended tip part
113: Sleeve 114: Bottom plate connecting rebar
115: Internal reinforcement plate
120: Precast insertion bracket
121: Bracket body 122: Hollow insertion part
200: Main row composite pile wall
210: Steel pipe part
211: Built-in connecting rebar 212: Reinforcement plate
213: Cover 214: Connecting rebar for top plate
215: Transverse rebar assembly 216: Deck extension rebar
220: Concrete pile part
230: opening 240: waterproof reinforcement plate
250: Steel support jaw
300: Deck for top plate
A: Underground structure A1: Middle column
A2: Both side walls A3: Top plate
A4: Bottom plate C: Concrete
h1: Central excavation hole
h2: Excavation holes on both side walls S: Inner excavation space

Claims (10)

Construction is carried out by lifting and penetrating into the central excavation hole (h1) formed by excavating the ground (G), and is supported on the bottom of the central excavation hole (h1), and the upper part including the upper surface of the hollow portion 111 is the central excavation hole ( h1) a precast hollow pile 110 constructed to be located inside; and a hollow portion 122 inserted into the exposed hollow portion 111 of the precast hollow pile 110, each of which is a precast hollow pile ( A precast insertion bracket 120 is inserted into the hollow portion 111 formed on the upper surface of the hollow portion 110 and installed to be supported on the upper surface of the precast hollow pile 110 while the hollow portion insertion portion 122 is supported on the bottom of the hollow portion 111. ); a precast hollow column (100) including;
The concrete pile part 220 including the PHC pile and the upper part of the concrete pile part 220 are inserted and installed by combining the upper and lower steel pipe parts 210 to form both side wall excavation holes (h2) in the ground (G). Main row composite pile wall (200); and
One end is supported on the upper surface of the bracket body 121 of the precast insertion bracket 120 continuously formed in the longitudinal direction, and the other end is an opening formed in the steel pipe portion 210 of the main row composite pile wall 200. A precast hollow column and main unit including a deck for the upper plate (300) connected to (230) and integrated with the precast hollow column (100) and the column-type composite pile wall (200) by pouring concrete (C). Underground structures using thermal composite pile walls. According to paragraph 1,
The precast hollow pile 110,
It is manufactured by a precast method made of reinforced concrete products in a factory, and a hollow part 111 is formed downward at a certain depth on the upper surface, and the lower part is formed by an expanded tip 112, and the expanded tip 112 ) is supported on the bottom of the central excavation hole (h1), and is an underground structure using precast hollow columns and column-type composite pile walls that are installed independently and spaced longitudinally in the central excavation hole (h1). According to paragraph 1,
The precast insertion bracket 120 is,
It is manufactured using a precast method using reinforced concrete products at a factory, and at least two hollow insertions 122 in the form of vertical members are integrally installed on the bottom of the bracket body 121,
Each of the hollow insertion parts 122 is inserted into the hollow part 111 formed on the upper surface of the precast hollow pile 110, and the hollow insertion part 122 is supported on the bottom of the hollow part 111, forming a precast insertion bracket. (120) is an underground structure using precast hollow columns and column-type composite pile walls installed to be supported on the upper surface of the precast hollow pile (110). According to paragraph 1,
The column-type composite pile wall 200 is,
The lower part is a concrete pile part 220 containing a PHC pile, and the upper part of the concrete pile part 220 is composed of a steel pipe part 210 at the top and bottom, and is inserted by forming both side wall excavation holes (h2) in the ground (G). It is installed to maintain the function of both side walls (A2) of the underground structure (A),
An opening 230 is formed on the outer peripheral surface of the steel pipe portion 210, and concrete (C) is poured into the opening 230 so that the other end of the top deck 300 is connected and integrated, so that they are structurally integrated with each other. An underground structure using precast hollow columns and column-type composite pile walls. According to clause 4,
The concrete pile part 220 and the steel pipe part 210 can be inserted and installed into both side wall excavation holes (h2) as a single unit, or a plurality of concrete pile parts 220 and steel pipe parts 210 can be connected to each other to install a plurality of concrete pile parts 220 and steel pipe parts 210. Insert and install into both side wall excavation holes (h2) at the same time,
A waterproof reinforcement plate 240 is further formed between the steel pipe portion 210 and the side of the steel pipe portion 210, and a bottom surface of one end of the upper deck 300 is formed on the outer peripheral surface of the lower steel pipe portion 210 of the opening 230. An underground structure using a precast hollow column and a column-type composite pile wall that further forms a steel support ledge 250 so that it can be supported. According to paragraph 4,
The steel pipe part 210,
It is constructed by installing a steel pipe with a sealed opening 230 in the ground or underground,
It includes a transverse reinforcing bar assembly 215 installed to extend transversely to the opening 230 exposed by removing the sealed opening 230,
The poured concrete is cured so that the inside of the opening 230 and the transverse reinforcing bar assembly 215 are buried, so that both side walls A2 and the top plate A3 of the underground structure A are transversely buried by concrete C. An underground structure using precast hollow columns and column-type composite pile walls that are integrated in the transverse direction by the directional rebar assembly (215). According to clause 6,
The steel pipe portion 210 includes a steel pipe formed with an opening 230,
The opening 230 is formed in a portion of the steel pipe that must be connected to the upper plate A3, and a built-in connecting reinforcing bar 211 is formed on the inner surface of the opening 230, and the opening 230 is formed by the cover 213. ) is sealed,
By removing the cover 213 at the stage where the upper plate (A3) is to be connected, the exposed built-in connecting reinforcing bar 211 and the connecting reinforcing bar 214 for the upper plate are connected to each other, and the column-type composite pile wall 200 is formed in the longitudinal direction. and a precast hollow column that ensures that the upper plate deck 300 is integrated by the poured concrete (C), and that the transverse reinforcing bar assembly 215 is seated in the opening 230 from which the cover 213 was removed. An underground structure using a column-type composite pile wall. According to paragraph 1,
The top deck 300 is,
One end is continuously installed in the longitudinal direction on the upper surface of the bracket body 121 of the longitudinally continuous precast insertion bracket 120,
The other side end is connected to the opening 230 formed in the steel pipe portion 210 of the longitudinally continuous main row composite pile wall 200 and is installed continuously in the longitudinal direction.
The upper plate deck 300 is installed continuously in the longitudinal direction, and the underground structure (A) consists of a middle column portion (A1) by the precast hollow column portion 100, and both side walls by the column-type composite pile wall 200 ( A2), using precast hollow columns and column-type composite pile walls to enable structurally integrated construction of the upper plate (A3) by the upper plate deck (300) in the longitudinal and transverse directions by pouring concrete (C). underground structures. (a) A central excavation hole (h1) is constructed in the ground (G) between both side wall excavation holes (h2) and both side wall excavation holes (h2) to a certain depth while continuing in the longitudinal direction, and the both side wall excavation holes ( Inserting a column-type composite pile wall 200 into h2) and a precast hollow pile 110 into the central excavation hole (h1);
(b) By excavating the ground (G) downward between the two side wall excavation holes (h2) in the ground (G), the steel pipe portion 210 of both side wall excavation holes (h2) and the precast hollow of the central excavation hole (h1) are hollowed out. Exposing the pile 110, connecting the precast insertion bracket 120 to the hollow portion 111 of the exposed precast hollow pile 110, and continuously constructing the precast insertion bracket 120 in the longitudinal direction; and
(c) Continuous installation of the upper plate deck 300 in the longitudinal direction using the steel pipe portion 210 of the column-type composite pile wall 200 and the precast insertion bracket 120 of the precast hollow column portion 100. It includes the step of pouring concrete (C) to integrate the column-type composite pile wall 200, the precast hollow column 100, and the upper deck 300 in the longitudinal direction,
Concrete (C) of a certain thickness on the opening 230 formed to be exposed to the steel pipe portion 210 of the column-type composite pile wall 200, the upper surface of the precast insertion bracket 120, and the upper surface of the upper deck 300. By pouring, the precast hollow deck (300) is structurally integrated with the steel pipe portion (210) of the main row composite pile wall (200) and the precast insertion bracket (120) of the precast hollow column portion (100). Construction method of underground structures using columns and column-type composite pile walls. According to clause 9,
In step (a) above,
A sleeve 113 is pre-embedded in the lower part of the precast hollow pile 110 so that bottom plate connecting reinforcing bars can be connected to connect the bottom plate A4, and the bottom plate is connected to the sleeve 113 in the longitudinal and transverse directions. The bottom plate (A4) and the precast hollow pile (110) are integrated with each other by fastening the reinforcing bars (114) so that the bottom plate connecting reinforcing bars are embedded inside the bottom plate (A4).
In step (a) above,
The sleeve 113 is embedded in the area where the bottom plate (A4) should be constructed in the concrete pile portion 220 formed in the lower part of the column-type composite pile wall 200, and the sleeve 113 is embedded in the bottom plate connecting reinforcing bar (113). 114) is fastened and extended, and then concrete (C) is poured so that the bottom plate connecting reinforcing bar (114) is buried so that the bottom plate (A4) is integrated with the main row composite pile wall (200). Construction method of underground structures using composite pile walls.