KR20220065461A - WIRE STRUCTURE FOR STAGGERED LAPPING IN SLURRY WALL, SLURRY WALL and CONSTRUCTION METHOD FOR THE SAME - Google Patents

Abstract

The present invention relates to an underground slurry wall, a construction method of an underground slurry wall and a reinforced structure used for the same. The reinforced structure according to the present invention is installed between a preceding panel and a following panel of an underground slurry wall such that transverse reinforcing rods of the preceding panel and the following panel may perform lap joint. To this end, the present invention is characterized by comprising: a blocking box including a box main body provided with a front surface plate, and a pair of side surface plates formed by being individually bent and extended from the both side ends of the front surface plate, and a separation plate which is inserted in a separable manner between the pair of side surface plates; and a plurality of middle reinforcing rods which perform lap joint with the transverse reinforcing rods of the preceding panel and the following panel, are formed in a transverse direction to be individually coupled to both surfaces of the front surface plate of the blocking box, and are arranged to be mutually spaced apart in the height direction of the blocking box. Therefore, construction may be easily performed.

Description

Reinforcing bar structure for underground continuous wall lamination, and method of constructing underground continuous wall and underground continuous wall using the same

The present invention relates to construction technology, and more particularly, to a continuous wall that can be permanently used as an outer wall under a building, a construction method thereof, and a reinforcing bar structure used therein.

A continuous underground wall is not a temporary facility that is temporarily installed and then demolished for retaining or waterproofing during the construction of the lower foundation of the building, but is a wall intended to be used permanently as an outer wall of the basement floor when the building structure is completed.

1 and 2 show the structure of a conventional underground continuous wall.

1 is a schematic plan view of an area in which an underground continuous wall is to be installed, as viewed from above. Here, the part marked with A is the leading panel part, and the part marked with B is the trailing panel part. When constructing an underground continuous wall, first divide the leading panel part and the trailing panel part so that they are alternately arranged along the area where the underground outer wall of the building is to be installed.

And the excavation proceeds downward with respect to the preceding panel parts (A1, A2, A3). More specifically, a guide wall (not shown) is installed on the ground surface, and the preceding panel part is excavated to a predetermined depth using an excavator. In this process, in order to prevent the hollow wall formed by excavation from collapsing, the excavation part is filled by injecting a stabilizing solution (usually bentonite solution) for maintaining the hollow wall together with the excavation.

When the excavation of the preceding panel part is completed, the rebar network in which the transverse rebar (1) and the longitudinal rebar (2) are interconnected is inserted into the excavation part while the stabilizing solution is filled, and using an injection pipe such as a trami pipe, Concrete is poured into the excavation part. Since concrete is heavier than the stabilizing solution, the stabilizing solution is pushed up to the top, and it is pumped and reused. When the filled concrete hardens, a wall is formed. All of the preceding panel parts A1, A2, and A3 may be excavated simultaneously or sequentially.

When the construction of the preceding panel unit is completed, excavation and wall formation are performed on the trailing panel units B1, B2, and B3 between the preceding panel units. The process is the same as the construction of the preceding panel part. When the construction of the preceding panel part and the following panel part is completed, the continuous wall is completed in the form shown in FIG. 2 .

Structural strength of such a conventional continuous wall is a problem. As described above, since the continuous underground wall makes the trailing panel part after making the leading panel part, the transverse reinforcement 1 of the leading panel part and the trailing panel part does not connect to each other as shown in FIG. 2 . Reinforcement-concrete structure is integrated and advantageous in strength when reinforcing bars are continuous throughout the continuous wall. In particular, under the condition that seismic design is strengthened as in recent times, the connection of reinforcing bars between panels is emerging as an important issue.

In order to solve this problem, a method in which the reinforcing bars of the leading panel part and the reinforcing bars of the trailing panel part overlap each other, that is, the overlapping method, as shown in the portion indicated by D in FIG. 3, is being studied. Among the reinforcing bars of the preceding panel part (A), concrete is first poured and hardened only in the central part except for both ends. And, after excavating the trailing panel, concrete is poured with the end of the trailing reinforcing bar network overlapped with the end of the preceding reinforcing bar network as indicated by D. When the trailing panel part is excavated in a state where concrete is not poured on both ends of the leading panel part, and concrete is poured into the trailing panel part in a state where the reinforcing bars of the trailing panel part and the reinforcing bars of the preceding panel part are overlapped with each other, the form is as shown in FIG. Concrete was poured with the preceding and trailing rebar networks overlapping each other, and the reinforcing bars of the leading and trailing panels were integrated with each other by the concrete, so the strength of the wall was strengthened. However, there is a problem in that it is technically very difficult to actually implement the above construction method. When pouring concrete into the preceding panel, it is practically very difficult to put a separate barrier material in order to prevent concrete from being poured at both ends. For reference, reference number g denotes the boundary between the excavation part of the leading panel part and the trailing panel part.

The present invention is to solve the above problems, and has an effect that the reinforcing bar network of the preceding panel and the following panel is substantially overlapped in the underground continuous wall, and the purpose of the present invention is to provide an underground continuous wall and a construction method thereof there is.

Another object of the present invention is to provide a reinforcing bar structure in which the transverse reinforcing bars of the preceding panel and the following panel are substantially overlapped in the underground continuous wall structure.

On the other hand, other objects not specified in the present invention will be additionally considered within the range that can be easily inferred from the following detailed description and effects thereof.

The reinforcing bar structure according to the present invention for solving the above object is installed between the leading panel and the trailing panel of the underground continuous wall, so that the transverse reinforcing bars of the preceding panel and the trailing panel are overlapped, the front plate, the front surface a block box having a box body having a pair of side plates that are respectively bent and extended from both ends of the plate, and a separation plate that is separably fitted between the pair of side plates; and a plurality of intermediate reinforcing bars overlapped with the transverse reinforcing bars of the preceding panel and the following panel, formed in the transverse direction, respectively coupled to both sides of the front plate of the blocking box, and disposed to be spaced apart from each other along the height direction of the blocking box It is characterized by having ;.

According to the present invention, it further includes an intermediate member detachably coupled to both surfaces of the blocking box front plate, and the intermediate reinforcing bar is coupled to the intermediate member.

In an example of the present invention, the intermediate member has a first surface coupled to the front plate of the blocking box, and a second surface bent from the first surface and to which the intermediate reinforcing bar is coupled.

In an example of the present invention, the intermediate member and the intermediate reinforcing bar are pre-manufactured in a factory, and it is preferable to be coupled to the blocking box at the construction site. More specifically, a through hole is formed in the front plate of the blocking box, and a through hole is formed in the intermediate member at a position corresponding to the through hole, respectively, a bolt inserted into the through hole and the through hole, and a nut fastened to the bolt The intermediate members disposed on both sides of the front plate by the method are coupled together to the front plate.

In one example of the present invention, the blocking box is preferably two unit units divided on both sides based on the central portion of the front plate are coupled to each other. And it may further include a water stop plate that is inserted between the two unit units and coupled to protrude with respect to both surfaces of the front plate.

An underground continuous wall for achieving another object of the present invention is a wall that forms the underground outer wall of a building, and comprises a preceding reinforcing bar network in which transverse and longitudinal reinforcing bars are interconnected, and a concrete body hardened in a state in which the preceding reinforcing bar network is embedded. A plurality of preceding panels provided with; a plurality of preceding panels comprising a succeeding reinforcing bar network in which transverse and longitudinal reinforcing bars are interconnected, and a concrete body hardened in a state in which the trailing reinforcing bar network is embedded, and arranged alternately with the preceding panel; and a reinforcing bar structure of the above configuration to be installed between the preceding panel and the following panel, wherein the intermediate reinforcing bars installed on both sides of the reinforcing bar structure block box are embedded in the concrete body of the preceding panel and the concrete body of the trailing panel, respectively It is characterized in that it is laminated with the transverse reinforcement of the preceding panel and the following panel, respectively.

The underground continuous wall construction method for achieving another object of the present invention is such that (a) the preceding panel part for excavation construction first and the trailing panel part for excavation construction afterwards are alternately arranged along the area where the continuous wall is constructed. partitioning; (b) excavating the preceding panel part, reinforcing a preceding reinforcing bar network in which transverse and longitudinal reinforcing bars are interconnected into the preceding panel unit, and reinforcing the reinforcing bar structures of the above configuration on both sides of the preceding reinforcing bar network, respectively, arranging the transverse reinforcing bars of the reinforcing bar network and the intermediate reinforcing bars of the reinforcing bar structure to overlap each other; (c) forming a preceding panel by pouring and hardening concrete between the blocking boxes disposed on both sides of the preceding panel unit; (d) excavating the trailing panel portion, separating the separation plate of the blocking box to expose the intermediate reinforcing bars disposed on the rear surface of the front plate; (d) reinforcing the trailing reinforcement network in which the transverse reinforcement and the longitudinal reinforcement are interconnected to the excavated trailing panel part, but arranging the transverse reinforcement of the trailing reinforcement network and the intermediate reinforcement of the reinforcement structure to overlap each other; and (e) forming a trailing panel by pouring and hardening concrete so that the trailing reinforcing bar network and the intermediate reinforcing bars are buried together in an overlapping state.

When the reinforcing bar structure according to the present invention is used, the structural strength of the wall is improved because the reinforcing bars of the preceding panel and the following panel can be substantially overlapped while constructing the underground continuous wall very simply.

On the other hand, even if it is an effect not explicitly mentioned herein, it is added that the effects described in the following specification expected by the technical features of the present invention and their potential effects are treated as described in the specification of the present invention.

1 and 2 are views for explaining a conventional underground continuous wall, FIG. 1 is a schematic plan view for explaining a preceding panel part and a following panel part for constructing a continuous wall, and FIG. 2 is a preceding and following panel part It is a schematic cross-sectional view after reinforcing rebar and pouring concrete.
3 is a schematic cross-sectional view illustrating a state in which reinforcing bars are overlapped with each other in a conventional underground continuous wall.
4 is a schematic exploded perspective view of a reinforcing bar structure according to an example of the present invention.
5 is a schematic perspective view of a modified example of the blocking box of the reinforcing bar structure shown in FIG.
6 is a schematic cross-sectional view taken along line AA of FIG. 5 .
7 is a schematic perspective view showing the arrangement state of the preceding reinforcing bar network and the reinforcing bar structure for making the preceding panel.
8 is a schematic cross-sectional view of the preceding panel.
9 is a state in which the trailing panel part is excavated in the state of FIG. 8 and the separation plate is removed.
10 shows a state in which the trailing reinforcing bar network is inserted and concrete is poured in the state of FIG. 9 to complete the trailing panel.
※ It is revealed that the accompanying drawings are exemplified as a reference for understanding the technical idea of the present invention, and the scope of the present invention is not limited thereby.

In the description of the present invention, if it is determined that related known functions are obvious to those skilled in the art and may unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

Hereinafter, with reference to the accompanying drawings, a reinforcing bar structure according to an example of the present invention will be first described, and then, a configuration of an underground continuous wall using the same and a construction method thereof will be described in detail.

A reinforcing bar structure according to an embodiment of the present invention is shown in FIG. 4 .

Referring to Figure 4, The reinforcing bar structure 50 according to an embodiment of the present invention includes a blocking box 10 and intermediate reinforcing bars 20 and 30 .

The blocking box 10 is formed long in the vertical direction, the front plate 11, a pair of side plates 12 bent and extended from both sides of the front plate 11, and from the lower part of the front plate 11 A bottom plate (not shown) that is bent to block the lower opening is provided. The front plate 11, the bottom plate, and a pair of side plates 12 form the box body. The bottom plate is inclined downward as it goes away from the front plate 11 . And on the surface facing the front plate 11, the separating plate 14 is installed between a pair of side plates 12, and the separating plate 14 is detachable/separable from the box body. In this example, as shown in FIG. 4 , long insertion grooves 15 are formed in the side plates 12 on both sides in the vertical direction, and the separation plate 14 is inserted into the insertion grooves between the side plates 12 on both sides ( 15) is detachably fitted. A rubber packing (not shown) or the like is interposed in the insertion groove portion 15 so that the separation plate 14 is force-fitted into the insertion groove portion 15 . However, since the separating plate 14 will be removed later, it is not preferable that the separating plate is strongly coupled to the blocking box. A method of attaching and detaching the separation plate to the blocking box may adopt various methods other than the above method.

The intermediate reinforcing bars 20 and 30 are respectively installed on the front side and the back side of the front plate 11, and are overlapped with each of the transverse reinforcing bars of the preceding reinforcing bar network and the succeeding reinforcing bar network to be described later. The intermediate reinforcing bars 20 and 30 are formed in the transverse direction like the transverse reinforcing bars of the preceding panel and the following panel. The intermediate reinforcing bars 20 and 30 may be directly coupled to the front and back surfaces of the front plate 11 by welding or the like, but in this example, they are coupled to the front plate 11 through the intermediate member 40 . That is, the intermediate member 40 used in this example is an 'L'-shaped angle pipe, a first surface 41 coupled to the front plate 11, and a second surface 42 bent from the first surface. The second surface 42 is bent in the same direction as the transverse reinforcement of the preceding reinforcing bar network and the succeeding reinforcing bar network. In this example, the intermediate member 40 is installed two at a time spaced apart from each other on the front and rear surfaces of the front plate 11, respectively. The intermediate reinforcing bars 20 and 30 are respectively spaced apart from each other along the up-down direction on the second surface 42 of the intermediate member 40 and are coupled by welding. And the front plate 11 has a through hole 19 formed therein And, a through hole 43 is formed at a position corresponding to the through hole 19 in the intermediate member 40 as well. In a state in which the intermediate member 40 is disposed on the front and rear surfaces of the front plate 11, respectively, the bolt 45 is inserted into the through hole 19 and the through hole 19 of the intermediate member 40 on both sides, and the nut 46 ) is signed. In this example, the intermediate reinforcing bars 20 and 30 are welded to the intermediate members 40 in the factory, and the intermediate reinforcing bars are provided to the construction site in a welded state to the intermediate members. At the construction site, the intermediate member 40 can be assembled very simply by fastening only the bolt-nut to the front plate 11 . The intermediate reinforcing bars 20 and 30 may be directly welded to the front plate in the field, but in this case, the working time in the field is long, and the quality of welding may be a problem due to the working conditions of the field. Therefore, in this embodiment, an intermediate member is used. If the intermediate rebar is welded to the intermediate member in a factory with excellent working conditions and transported to the site, the intermediate rebar can be easily combined with the blocking box only by bolt-nut work.

On the other hand, although it is shown in FIG. 4 that the blocking box 10 is integrally manufactured, the blocking box 10 is preferably divided into two unit units 10a and 10b as shown in FIGS. 5 and 6 . Do. Referring to the drawings, each unit unit (10a, 10b) has a flange portion (f) bent forward is formed, and in a state where the flange portion (f) faces each other, the bolt (b) and the nut (n) are attached to the flange. By being fitted and fastened, the blocking box 10 is assembled. And between the two unit units (10a, 10b) is coupled to the water stop plate (18) to prevent the inflow of water. The water stop plate 18 is disposed to protrude from both surfaces of the front plate 11 .

Hereinafter, a method for constructing an underground continuous wall using the reinforcing bar structure 50 having the above configuration and a structure of the completed underground continuous wall will be described.

First, the leading panel part (A) and the trailing panel part (B) are partitioned along the area where the underground continuous wall is made, and the leading panel part is first excavated. After excavating the preceding panel part, the preceding reinforcing bar network 70 as shown in FIG. 7 is inserted into the excavated preceding panel part. The preceding reinforcing bar network 70 forms a lattice form by forming a plurality of columns and transverse reinforcing bars 71 and longitudinal reinforcing bars 72, respectively.

After reinforcing the preceding reinforcing bar network 70 into the preceding panel part, the reinforcing bar structures 50 of the above-described structure are inserted on both sides of the preceding reinforcing bar network, respectively. At this time, the intermediate reinforcing bars 20 of the reinforcing bar structure 50 are arranged to overlap each other with the transverse reinforcing bars 71 of the preceding reinforcing bar network 70 . In this way, in a state in which the intermediate reinforcing bars 20 of the reinforcing bar structure 50 and the transverse reinforcing bars 71 of the preceding reinforcing bar network 70 are overlapped with each other, the concrete c is poured and hardened between the reinforcing bar structures 50 at both ends in FIG. The preceding panel 100 is completed as shown. Concrete is not poured in the space 17 in which the intermediate reinforcing bar 30 is disposed inside the blocking box 20 in the above state. That is, all of the preceding panel part (A) was excavated and the preceding rebar network 70 and two reinforcing bar structures 50 were disposed therein, but the concrete c was poured only between the blocking boxes 10 on both sides and the preceding panel (100) is completed.

When the leading panel 100 is completed, now the trailing panel part B is excavated and the separation plate 14 is removed from the blocking box 10 as shown in FIG. 9 . The separation plate 14 can be easily separated by a crane or the like. When the separation plate 14 is removed, the intermediate reinforcing bar 30 of the reinforcing bar structure 50 is exposed to the outside. And similarly to the preceding reinforcing bar network, the succeeding reinforcing bar network 80 composed of the transverse reinforcing bars 81 and the longitudinal reinforcing bars 82 is inserted into the trailing panel part B. Also at this time, the transverse reinforcing bars 81 of the trailing reinforcing bar network 80 are arranged to overlap each other with the intermediate reinforcing bars 30 of the reinforcing bar structure. Concrete (c) is poured and hardened in a state in which the reinforcing bars are overlapped in this way to complete the trailing panel 200 as shown in FIG. 10 .

That is, in the underground continuous wall, the leading panel 100 and the trailing panel 200 are alternately arranged, and the structure in which the reinforcing bar structure 50 is installed is continuously connected along the wall. The above structure solves the problem that the transverse reinforcing bars of the leading and trailing panels do not overlap each other in the existing underground continuous wall. Referring to FIG. 10 , the intermediate reinforcing bars 20 and 30 provided on both sides of the reinforcing bar structure 50 are mutually with the transverse reinforcing bars 71 of the preceding reinforcing bar network 70 and the transverse reinforcing bars 81 of the trailing reinforcing bar network 80, respectively. They are arranged in an overlapping state, and are buried together in the concrete of the preceding panel and the following panel. Although the transverse reinforcing bars of the preceding panel and the following panel are not directly overlapped, the transverse reinforcing bars inside the continuous wall are continuously overlapped using the reinforcing bar structure. Through this, the structural safety of the underground continuous wall can be improved.

In addition, there is an advantage that construction is very simple. That is, in the present invention, the leading rebar network, the trailing reinforcing bar network, and the reinforcing bar structure are each separately assembled, and these are independently inserted into the leading and trailing panel sections. For example, in another invention of the present applicant (currently unpublished), construction is very simple compared to the case in which the blocking boxes must be pre-assembled on both sides of the preceding reinforcing bar network and must be inserted into the preceding panel.

On the other hand, until now, it has been described and illustrated that the blocking box 10 is divided into two unit units (10a, 10b) on both sides only by assembling at the site, in another example of the present invention, the height direction as shown in FIG. Accordingly, the blocking box 10 can be manufactured with a plurality of segments. Since the blocking box 10 is very high at about 10 m or more, there is a concern that the blocking box may be distorted and the verticality may not be accurately maintained in the process of moving and working by lifting the blocking box by the crane during the construction process. If the blocking box is twisted, the verticality is not maintained, so there is a problem that it cannot function accurately as a form when concrete is poured after it is installed in the excavation part. Another problem remains that, since the block box is very long, it is difficult to transport it to the construction site even after the block box is manufactured at the factory. Accordingly, the blocking box may be divided into a plurality of segments 80 along the vertical direction as shown in FIG. 10 . Of course, each segment 80 may be further divided into unit units 10a and 10b as shown in FIG. 5 . Each segment 80 is provided with reinforcing bars 81 and 82 on the upper and lower surfaces, respectively, and holes 83 are formed in the reinforcing bars. In a state where the upper and lower segments are in contact with each other, the bolt and the nut are fastened through the hole 83 to assemble the blocking box 10 . In this case, the intermediate member 40 to which the intermediate reinforcing bars 20 and 30 are welded is also divided in the vertical direction, and the height thereof is made to correspond to the height of the segment of the blocking box.

The blocking box of the form shown in FIG. 10 is to mutually assemble the segment 80 divided up and down and the unit units 10a and 10b divided into both sides, and block the intermediate member 40 to which the intermediate reinforcing bar 30 is welded. By coupling to the box 10, it is possible to complete the reinforcing bar structure. By dividing the reinforcing bar structure into a plurality of pieces in this way, above all, transportation is facilitated, and there is an advantage in that the original shape can be well maintained without distortion or deformation. In addition, there is an advantage that not only the manufacturing time can be greatly shortened, but also the manufacturing quality is excellent compared to manufacturing the reinforcing bar structure directly on site, especially by directly welding the intermediate reinforcing bar to the blocking box.

The protection scope of the present invention is not limited to the description and expression of the embodiments explicitly described above. In addition, it is added once again that the protection scope of the present invention cannot be limited due to obvious changes or substitutions in the technical field to which the present invention pertains.

100 ... leading panel, 200 ... trailing panel, 300 ... underground continuous wall
10 ... blocking box, 11 ... front plate, 12 ... side plate, 14 ... separator
20, 30 ... Intermediate reinforcing bars, 40 ... Intermediate members, 50 ... Rebar structures
70 ... preceding reinforcing bars, 71 ... transverse reinforcing bars, 82 ... longitudinal reinforcing bars
80 ... trailing reinforcing bar network, 81 ... transverse reinforcing bar, 22 ... longitudinal rebar
A ... leading panel part, B ... trailing panel part, C ... concrete

Claims (9)

It is installed between the leading panel and the trailing panel of the underground continuous wall so that the transverse reinforcing bars of the preceding panel and the trailing panel are overlapped,
a front plate, a box body having a pair of side plates that are respectively bent and extended from both ends of the front plate, and a blocking box having a separating plate separably fitted between the pair of side plates; and
a plurality of intermediate reinforcing bars overlapped with the transverse reinforcing bars of the preceding panel and the following panel, formed in a transverse direction, respectively coupled to both surfaces of the blocking box front plate, and disposed to be spaced apart from each other along the height direction of the blocking box; Reinforced structure for lap joints of the underground continuous wall, characterized in that it comprises a. The method of claim 1,
Further comprising an intermediate member detachably coupled to both sides of the blocking box front plate,
The intermediate reinforcing bar is a reinforcing bar structure for a continuous underground wall lap joint, characterized in that it is coupled to the intermediate member. 3. The method of claim 2,
The intermediate member is a reinforcing bar structure for a continuous underground wall, characterized in that it has a first surface coupled to the front plate of the blocking box, and a second surface bent from the first surface and to which the intermediate reinforcing bar is coupled. 3. The method of claim 2,
The intermediate member and the intermediate reinforcing bar are pre-manufactured in a factory, and a reinforcing bar structure for a continuous underground wall, characterized in that it is coupled to the blocking box at a construction site. 3. The method of claim 2,
A through hole is formed in the front plate of the blocking box,
A through hole is formed in the intermediate member at a position corresponding to the through hole, respectively,
The reinforcing bar structure for continuous underground wall lamination, characterized in that the through-hole, the bolt inserted into the through-hole, and the intermediate members disposed on both sides of the front plate by a nut fastened to the bolt are coupled together to the front plate. . The method of claim 1,
The blocking box is a reinforcing bar structure for a continuous underground wall, characterized in that two unit units divided on both sides based on the central portion of the front plate are coupled to each other. 7. The method of claim 6,
Reinforcing bar structure for continuous underground wall jointing, characterized in that it further comprises a water stop plate which is inserted between the two unit units and is coupled to protrude with respect to both surfaces of the front plate. As a wall forming the basement outer wall of a building,
a plurality of preceding panels having a preceding reinforcing bar network in which transverse and longitudinal reinforcing bars are interconnected, and a concrete body hardened in a state in which the preceding reinforcing bar network is embedded;
a plurality of preceding panels comprising a succeeding reinforcing bar network in which transverse and longitudinal reinforcing bars are interconnected, and a concrete body hardened in a state in which the trailing reinforcing bar network is embedded, and arranged alternately with the preceding panel; and
As described in any one of claims 1 to 7, comprising a reinforcing bar structure installed between the preceding panel and the following panel,
Intermediate reinforcing bars installed on both sides of the reinforced structure blocking box are embedded in the concrete body of the preceding panel and the concrete body of the trailing panel, respectively, and are respectively overlapped with the transverse reinforcement of the preceding panel and the following panel. . (a) partitioning so that the leading panel part for excavation construction first and the trailing panel part for excavation construction afterwards are alternately arranged along the area where the continuous wall is constructed;
(b) excavating the preceding panel part, inserting a preceding reinforcing bar network in which transverse and longitudinal reinforcing bars are interconnected to the preceding panel part, and inserting the reinforcing bar structure according to any one of claims 1 to 7 into the preceding reinforcing bar network arranging the transverse reinforcing bars of the preceding reinforcing bar network and the intermediate reinforcing bars of the reinforcing bar structure to overlap each other by reinforcing on both sides;
(c) forming a preceding panel by pouring and hardening concrete between the blocking boxes disposed on both sides of the preceding panel unit;
(d) excavating the trailing panel portion, separating the separation plate of the blocking box to expose the intermediate reinforcing bars disposed on the rear surface of the front plate;
(d) reinforcing the trailing reinforcement network in which the transverse reinforcement and the longitudinal reinforcement are interconnected to the excavated trailing panel part, but arranging the transverse reinforcement of the trailing reinforcement network and the intermediate reinforcement of the reinforcement structure to overlap each other; and
(e) forming a trailing panel by pouring and hardening concrete so that the trailing reinforcing bar network and the intermediate reinforcing bars are buried together in an overlapping state;

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