KR20230155347A - Buried box structure for staggered lapping and method for construction of slurry wall using the same - Google Patents

Abstract

The present invention relates to a reinforcing bar layer joint box structure for layering a reinforcing bar network between adjacent panels constructed at different times in an underground continuous wall, and a construction method using the same.
The reinforcing bar overlap box structure according to the present invention is buried inside an underground continuous wall, and is composed of a flat plate portion formed long in the depth direction, a pair of side plates protruding from both sides of the flat plate portion, and a pair of side plate portions. A cable-stayed member having a pair of flange portions each extending along the width direction of the underground continuous wall; A separator plate detachably coupled between a pair of side plates of the cable-stayed member; And it is characterized by having joint reinforcing bars formed along the longitudinal direction of the underground continuous wall and joined through the flat plate part.

Description

Cable-stayed reinforcing bar joint box structure and underground continuous wall construction method using the same {BURIED BOX STRUCTURE FOR STAGGERED LAPPING AND METHOD FOR CONSTRUCTION OF SLURRY WALL USING THE SAME}

The present invention relates to construction technology, and in particular to a structure used for reinforcing bar connections in the construction of a continuous wall permanently used as an exterior wall at the bottom of a building.

An underground continuous wall is not a temporary facility that is temporarily installed and then removed for earth blocking or water blocking during the foundation construction of the lower part of a building, but is a wall that is intended to be permanently used as the outer wall of the basement when the building structure is completed.

Figure 1 is a schematic cross-sectional view of an underground continuous wall in which the reinforcing bar networks of the leading and trailing panels are arranged to overlap each other.

Referring to the drawing, the underground continuous wall has leading panels (A) and trailing panels (B) arranged alternately. First excavate the area where the preceding panel will be installed, insert a reinforcing bar network composed of transverse reinforcing bars (1) and longitudinal reinforcing bars (2), and then pour concrete (C) to complete the preceding panel (A). Once the preceding panel (A) is completed, the following panel (B) is completed in the same way. Reference number g indicates the boundary between the leading panel (A) and the following panel (B).

In an underground continuous wall, the ends of the reinforcing bar networks of the preceding panel (A) and the following panel (B) must overlap each other as indicated by F in Figure 1. To achieve this, structures such as a blocking box shown in Figure 2 are installed during the construction process. must be used.

Figures 2 and 3 schematically show the construction process to ensure that the reinforcing bar networks of the preceding and succeeding panels overlap each other. Referring to the drawing, after excavating the preceding panel area (A1), an empty blocking box (9) is installed at the end of the excavated area. When the rebar net (3) is installed and the concrete (C) is poured with the blocking box (9) installed, the state is as shown in FIG. 2. In this state, after excavating the trailing panel area (B1) and removing the blocking box (9), the reinforcing bar network (4) of the trailing panel is placed, resulting in a state as shown in FIG. 3. If concrete is poured in this state, the trailing panel is completed.

The problem is that it is not easy to remove the blocking box (9). 2, the concrete (C) poured in the preceding panel area (A1) flows out between the blocking box (9) and the excavation wall (where overburden generally occurs) and hardens in front of the blocking box (9) ( P) occurs. After the concrete of the leading panel is cured and the trailing panel area (B1) is excavated, the blocking box (9) is removed from the ground using a crane or lift. Because of the part (P) where the concrete has leaked and hardened, the blocking box (9) ) Removal becomes difficult. Of course, when excavating the trailing panel area (B1) using a BC cutter, if the concrete is completely excavated up to the contact surface (K) of the blocking box (9), the hardened portion (P) where the concrete flows out can be removed. To do this, the BC cutter comes into contact with the blocking box (9) and the bit may be damaged. Accordingly, in actual construction, the part (P) where concrete has leaked and hardened is often not removed during the excavation process of the trailing panel area. In the end, you will have difficulty removing the blocking box.

On the other hand, if concrete leaks between the blocking box and the empty wall, a bigger problem may occur. There are two types of blocking boxes: a completely separate type as in the previous example and a partially closed type. As shown in Figure 4, some cable-stayed types only remove the separation plate 8 on the front of the blocking box and leave the box body 7 intact. In this form, the space between the separation plate (8) and the box body (7) must be completely sealed, but since the separation plate (8) must be removed later, the box body (7) and the separation plate (8) are often loosely coupled. am. Therefore, there is a gap (X) between the box body (7) and the separation plate (8). Concrete poured in the preceding panel area may flow into the blocking box (9) through the gap (overflow) between the blocking box and the empty wall, and between the box body (7) and the separation plate (8). Later, after the separation plate is removed, the reinforcing bar network of the trailing panel must be inserted into the space inside the blocking box (9), but if the concrete hardens inside the blocking box, inserting the reinforcing bar network is impossible, making construction very difficult.

The present invention is intended to solve the above problems, and its purpose is to provide a reinforcing bar joint box structure with an improved structure so that it can be easily separated and prevent concrete from flowing into the interior, and a method of constructing an underground continuous wall using the same. there is.

Meanwhile, other unspecified purposes of the present invention will be additionally considered within the scope that can be easily inferred from the following detailed description and its effects.

The cable-stayed reinforcing bar overlap box structure according to the present invention for achieving the above object is constructed at a time difference in the underground continuous wall and is intended to overlap the reinforcing bar network between adjacent panels, and is installed inside the underground continuous wall. It is buried and includes a flat plate portion that is long in the depth direction, a pair of side plates that protrude from both sides of the flat plate portion, and a pair of side plates that each extend along the width direction of the underground continuous wall from the pair of side plates. A cable-stayed member having a flange portion; A separator plate detachably coupled between a pair of side plate portions of the cable-stayed member; Joint reinforcing bars formed along the longitudinal direction of the underground continuous wall and coupled through the flat portion; And it is coupled to the pair of side plates, and when the cable-stayed member and the separation plate are coupled, it is placed in the gap between the side plate and the separation plate, thereby sealing the space between the side plate and the separation plate, and forming the part of the underground continuous wall. It is characterized by having a pair of water stop members protrudingly arranged along the width direction.

According to the present invention, a concave fitting portion is formed at one end of the pair of side plates and the separating plate, and an end of the other one of the pair of side plate portions and the separating plate is formed as an insertion portion fitted into the fitting portion. The water stopper material is folded and placed on the fitting portion to seal between the side plate portion and the separator plate. When the separator plate is removed from the cable-stayed member, the waterstop material is elastically deformed and spread out along the width direction of the continuous wall. It protrudes from the side plate.

In one example of the present invention, the cross section has a 'ㄹ' shape and is formed long along the depth direction of the underground continuous wall, further comprising a pair of rail parts symmetrically coupled to the inner surface of the pair of side plate parts. In addition, the rail portion functions as a fitting portion into which the separator plate is inserted and coupled, and a through hole is formed in the rail portion so that the joint reinforcing bar can be supported by being inserted into the through hole.

In one example of the present invention, the pair of flange portions extend from the ends of the pair of side plates, and the separation plate is disposed closer to the flat portion than to the flange portion along the longitudinal direction of the continuous wall. It is desirable. In addition, a gap cushioning material made of a soft material hard enough not to damage the bit when in contact with the bit of a ground excavation device and attached to the back of the separation plate may be further provided.

In one example of the present invention, a gap cushioning material made of a soft material hard enough not to damage the bit when in contact with the bit of a ground excavator and attached to the back of the pair of flange portions and the separator plate is further provided. can do. The gap cushioning material may be Styrofoam.

On the other hand, the present invention is a method of constructing an underground continuous wall in which concrete panels are continuously connected, (a) excavating the ground to form a first excavation part, and forming a first rebar in which a plurality of transverse reinforcing bars and longitudinal reinforcing bars are connected. After the network is inserted into the first excavation section, the cable-stayed reinforcing bar joint box structure according to any one of claims 1 to 7 is installed to be inserted between the transverse reinforcing bars of the first rebar network, and concrete is placed in the first excavation section. Completing the first panel by pouring and curing; (b) Excavating the ground next to the first panel to form a second excavation, and removing the separator plate from the cable-stayed rebar laminated box structure to create a space inside the cable-stayed rebar laminated box structure. Opening toward the second excavation portion and protruding the water stopper member to the outside of the cable-stayed member while unfolding; and (c) inserting a second rebar network in which a plurality of transverse rebars and longitudinal rebars are connected into the second excavation, where the transverse rebars of the second rebar network overlap with the transverse rebars and joint rebars of the first rebar network. It is characterized in that it includes the step of pouring and hardening concrete in the second excavation part after arranging it so that it is supported.

Using the cable-stayed reinforcing bar joint box structure according to the present invention has the advantage that the construction of an underground continuous wall becomes easier because the separation plate can be easily removed.

In addition, using the structure according to the present invention has the advantage that the space in the reinforcing bar joint space is completely sealed, preventing concrete from flowing into the lap joint space.

In addition, in the present invention, by installing a gap buffer on the back of the cable-stayed reinforcing bar joint box structure, it is possible to prevent the bits of the excavation equipment from being damaged by contact with the box structure. Accordingly, there is an advantage that the concrete that has leaked and hardened to the outside of the box structure can be easily removed using excavation equipment.

Meanwhile, it is to be added that even if the effects are not explicitly mentioned herein, the effects described in the following specification and their potential effects expected from the technical features of the present invention are treated as if described in the specification of the present invention.

Figure 1 is a schematic cross-sectional view of an underground continuous wall in which the reinforcing bar networks of the leading and trailing panels are arranged to overlap each other.
Figures 2 and 3 schematically show the construction process to ensure that the reinforcing bar networks of the preceding and succeeding panels overlap each other.
Figure 4 is for explaining the structure and problems of some cable-stayed buried blocking boxes.
Figure 5 is a schematic perspective view of a cable-stayed reinforcing bar joint box structure according to an example of the present invention.
Figure 6 is a schematic cross-sectional view of Figure 5.
Figure 7 is a schematic cross-sectional view of the state of Figure 6 with the second panel area excavated and the separation plate removed.
Figure 8 is a schematic cross-sectional view of the second panel in a completed state.
Figures 9a and 9b show an example of a form in which a gap buffer and a water stopper are added.
Figure 10 is a variation of the example shown in Figure 9A.
Figure 11 is an example of a modified shape of the rail portion.
Figure 12 is a schematic flowchart of an underground continuous wall construction method according to an example of the present invention.
※ The attached drawings are intended as reference for understanding the technical idea of the present invention, and are not intended to limit the scope of the present invention.

In describing the present invention, detailed descriptions of related known functions will be omitted if they are obvious to those skilled in the art and are judged to unnecessarily obscure the gist of the present invention.

Hereinafter, with reference to the attached drawings, the cable-stayed reinforcing bar layer joint box structure according to the present invention will be described in more detail, and then the underground continuous wall construction method using the box structure will be described in detail.

Figure 5 is a schematic perspective view of a cable-stayed reinforcing bar joint box structure according to an example of the present invention, Figure 6 is a schematic cross-sectional view of Figure 5, and Figure 7 is a state of Figure 6 in which the second panel area is excavated and the separation plate is removed. This is a schematic cross-sectional view of the completed state, and Figure 8 is a schematic cross-sectional view of the second panel in a completed state.

Referring to the drawings, the cable-stayed reinforcing bar lap joint box structure (100, hereinafter referred to as 'lap joint box structure') according to an example of the present invention is constructed at time intervals in an underground continuous wall and is constructed with adjacent reinforced concrete panels. It is used to connect reinforcing bar networks to each other. Here, the reinforced concrete panel may be a leading panel and a trailing panel, or it may be in a form where the trailing panels are continuously connected around one leading panel. This will be explained again later. The panels are constructed at different times. For convenience of explanation, the panel constructed first is referred to as the first panel (A), and the panel constructed later is referred to as the second panel (B).

The lap joint box structure 100 according to the present invention includes a cable-stayed member 10, a separating plate 20, and joint reinforcing bars 30.

The cable-stayed member 10 is embedded in the concrete of the first panel A and is formed long along the depth direction. The cable-stayed member 10 includes a flat plate portion 11 and a pair of side plate portions 12 and 13 that are bent and protrude from both sides of the flat plate portion 11. In addition, the side plate portions 12 and 13 of the cable-stayed member 10 are bent again to form a pair of flange portions 14 and 15 extending along the width direction of the underground continuous wall. The ends of the flange portions 14 and 15 are preferably in close contact with the hollow wall of the excavation portion. Accordingly, the overall width of the cable-stayed member corresponds to the overall width (W) of the underground continuous wall. The distance (Q) between a pair of side plates (12, 13) is narrower than the width (W) of the underground continuous wall. There is a free space equal to the width (S) of the flange parts (14, 15) between the hollow wall of the first panel excavation part and the side plate parts (12, 13), and the transverse reinforcing bar (1) and longitudinal reinforcing bar (2) are placed in this space. The reinforcing bar network 3 of the first panel A can be placed.

In the present invention, an important feature is that by providing a pair of flange portions in the cable-stayed member, the separation plate is arranged to be spaced apart from the hollow wall of the excavation section. This is to prevent concrete from flowing out and hardening on the separator side as described in the prior art. This will be discussed again later.

The separation plate 20 has a flat plate shape and is formed long along the depth direction of the underground continuous wall, and is separably inserted and coupled between a pair of side plate portions 12 and 13 of the cable-stayed member 10. When the separation plate 20 is coupled to the cable-stayed member 10, a space 19 sealed by the flat plate portion 11 of the cable-stayed member 10, a pair of side plate portions 12 and 13, and the separation plate 20 is formed. ) is formed. As will be explained later, the reinforcing bar network (8) of the second panel (B) is inserted into this space (19) and overlapped with the reinforcing bar network (3) of the first panel (A). In addition, the separator plate 20 may be disposed on the same line as the pair of flange portions 14 and 15, as in the example of FIG. 6, but is positioned at a certain distance from the line on which the flange portions 14 and 15 are disposed, as shown in FIG. 11. It may be spaced apart by the distance K and placed close to the flat plate portion 11.

There are various ways to allow the separation plate 20 and the cable-stayed member 10 to be coupled to each other in a separable manner. In this example, as shown in FIG. 6, the ends of a pair of side plate portions 12 and 13 of the cable-stayed member 10 are used. A method is used in which a fitting portion 17 is formed in a concave manner, and both ends of the separator plate 20 are fitted and coupled to the fitting portion 17. For convenience of explanation, the part of the separator plate 20 that is inserted into the fitting part 17 is called an insertion part. Unlike the example shown in FIG. 6, in another example, a fitting portion may be formed in the separator plate 20 and a pair of side plate portions may be fitted into the separator plate.

The important point is that the space 19 inside the lap joint box structure 100 must be sealed by coupling the cable-stayed member 10 and the separation plate 20 to each other. As shown in FIG. 8, since the reinforcing bar network 8 of the second panel (B) must be inserted into this space 19, the concrete (C) poured into the excavated part of the first panel (A) must be inserted into this space (19). It must not flow into the space (19). However, since the separator plate 20 is removed from the cable-stayed member 10 when construction of the first panel A is completed, the separator plate 20 is generally loosely fitted into the fitting portion 17. As a result, a gap may appear between the separation plate 20 and the side plate portions 12 and 13.

In the example shown in FIGS. 9A and 10, the water stopper material 50 is placed on the fitting portion 17 to seal the gap between the separator plate 20 and the side plate portions 12 and 13. The water stop material 50 is made of an elastically deformable material, such as a rubber material, and can be formed to be long and bent or folded.

Looking at the enlarged view of FIG. 9A, the insertion portion 21 of the separator plate 20 is inserted into the fitting portion 17, and the water stopper material 50 is placed in the remaining area of the fitting portion 17. In this example, the water stopper 50 is formed along the width direction of the underground continuous wall, extends beyond the fitting portion 17, and has a zigzag cross section. The water stopper material 50 is inserted into the fitting portion 17 to seal the gap between the separator plate 20 and the side wall portion 13.

In the example of FIG. 10, the stop material 60 is in a folded form. Since one end of the stopper material 60 is folded once while being fixed to the side plate portion 13, the space between the separator plate 20 and the side plate portion 13 can be better sealed. When the separation plate 20 is removed, the folded stopper material 60 unfolds and protrudes to the outside of the fitting portion 17. In this example, since the water stopper 60 is folded once, when unfolded, it can be arranged to be longer than the waterstop material in the previous example. Although not shown, in another example, the stop material may be folded twice and arranged to surround the end of the separator plate.

However, in the present invention, the sealing function can be performed only when the separator is in contact with the water stopper over a certain area. However, if the contact area is too large, it is difficult to remove the separator due to friction with the water stopper made of rubber. You can lose. For this purpose, the present invention provides a form as shown in Figure 9b.

Referring to Figure 9b, like Figure 9a, a concave fitting portion 17 is formed at the end of the side plate. In order to form the concave fitting part 17, the protruding parts spaced apart from each other on both sides of the fitting part are called protruding rails. The water stop material has a zigzag cross section and a long water stop portion 81, and an insertion hole 82 with a 'U' shaped cross section is formed at the end of the water stop portion 81. The insertion hole 82 is fitted and coupled to a protruding rail disposed close to the flat portion among the pair of protruding rails, so that the stopper portion 81 is spaced apart from the separator plate 20 without contacting it. Accordingly, when removing the separator plate 20, it does not come into contact with the water stop portion 81, making it easy to separate. Of course, as shown in FIG. 9B, the insertion hole for the water stopper is placed in the fitting portion, so that the space between the separator plate 20 and the side plate portion 15 is sealed.

During the construction of the first panel (A), the water-stop material serves to seal the gap between the separation plate and the side plate, but after the underground continuous wall is completed, it prevents groundwater or rainwater from entering the basement inside the building from the outside. It performs a waterproof function. In other words, groundwater or rainwater outside the building can flow into the continuous wall along the boundary of the cable-stayed member 10, and since the water-stop material is placed on the path through which water flows in, it can perform a waterproofing function. In particular, the waterproof material has a zigzag cross section, which can more effectively block the flow of groundwater or rainwater.

The joint reinforcing bar 30 is inserted and coupled to the flat plate portion 11 of the cable-stayed member 10, as shown in FIGS. 6 and 8. In this example, the joint reinforcing bar 30 is inserted through the flat plate portion 11 and then joined by welding. One end of the joint reinforcing bar 30 is disposed on the first panel (A) side and overlaps the reinforcing bar network 3 of the first panel. Since the other end of the joint rebar is inserted into the inner space 19 of the cable-stayed member 10, it also overlaps with the rebar network 30 of the first panel (A) and the rebar network 8 of the second panel (B). It is placed neatly. In this example, even without joint reinforcing bars, the reinforcing bar network (8) of the second panel (B) is inserted deep into the inner space 19 of the cable-stayed member, and the reinforcing bar network (3) of the first panel (A) is arranged to overlap. Therefore, the reinforcing bars are layered. However, there is an effect of strengthening the reinforcing bar joints by arranging the joint reinforcing bars (30).

In another example shown in FIG. 11, the joint reinforcing bars may not be firmly joined to the flat plate by welding, etc., but may simply be placed on the plate. In the example of Figure 11, the cross-section is formed in the shape of 'ㄹ', and the rail portion 16 formed long along the depth direction is symmetrically installed on each inner surface of the pair of side plate portions 12 and 13. One end of the rail portion 16 functions as a fitting portion 17 into which the separator plate 20 is inserted, and the joint reinforcing bar 30 is inserted into and supported by a through hole 18 formed at the other end. The joint reinforcing bar 30 may be supported by being inserted into the through hole 11a formed in the flat plate portion 11 and the through hole 18 formed in the rail portion 16. In this example, since there is no need to weld the joint reinforcing bars 30 to the flat part 11 of the cable-stayed member, there is an advantage in that the manufacturing of the lap joint box structure is easy and the construction period can be reduced.

Meanwhile, as shown in FIGS. 9 to 11, in another example of the present invention, a gap buffer 40 may be provided. The gap buffer 40 may be attached only to the back of the separator plate 20, or may be attached to the back of the separator 20 and the pair of flange portions 14 and 15 together. The gap buffer 40 is made of a very soft material and has a hardness that does not damage the bit even when it comes into contact with the bit of the excavation equipment. In this example, straw foam is used as the gap buffer 40.

As explained in the prior art, the concrete (C) poured into the first panel (A) may flow out between the hollow wall and the lap joint box structure. In the present invention, the flange portions 14 and 15 are provided to ensure that even if concrete flows out, it does not move to the place where the separator plate 20 is placed. This is because if the concrete hardens only on the flange portions 14 and 15, there is no effect on the removal of the separator plate. However, if there is a lot of concrete leakage, the possibility of hardening on the separator plate 21 cannot be ruled out. In this case, it becomes difficult to separate the separation plate 20 from the cable-stayed member 10. When excavating the second panel (B) area, the excavating equipment can remove the concrete outflow together, but the bits may be damaged as the bit of the overlapping box structure 100 and the excavating equipment rub, so the excavating equipment must be overlapped. Do not approach closely to the box structure (100).

The gap buffer 40 is intended to solve the above problem. In this example, the concrete flowing out from the first panel (A) hardens at the back side of the gap buffer 40 (at the boundary point with the second panel). When excavating the ground in the area of the second panel (B), even if the excavation equipment approaches the layered box structure to remove the hardened concrete that leaked from the first panel (A), it is not connected to the separation plate (20) made of iron. It does not come into contact, but comes into contact with the gap cushioning material 40 made of Styrofoam. Since the bit is not damaged even when in contact with the gap buffer 40, the concrete outflow can be actively removed when excavating the second panel area. The gap buffer 40 is removed together when excavating the second panel area. When the concrete outflow portion is removed in this way, it is easy to separate the separation plate 20 from the cable-stayed member 10. In order to produce the above-mentioned effect, it is preferable that the thickness of the gap buffer 50 is at least 1.5 to 3.5 cm. This is because the bit needs to be 1.5cm, more preferably 2cm or more, to safely contact the bit.

Hereinafter, a method of constructing an underground continuous wall using the reinforcing bar joint box structure 100 of the above configuration will be described.

Figure 12 is a schematic flowchart of the underground continuous wall construction method.

Referring to Figure 12, in the present invention, the first panel (A) area is first excavated in the area where the underground continuous wall is to be installed. Install a guide wall (not shown) and excavate downward from the inner area of the guide wall using excavation equipment such as a BC cutter. To prevent the collapse of the excavated wall, bentonite stabilizer is filled.

When the excavation is completed, as shown in the previous drawings, the first reinforcing bar network (3) consisting of a plurality of transverse reinforcing bars (1) and longitudinal reinforcing bars (2) is inserted into the excavation part. And, as described above, a reinforcing bar joint box structure 100 in which the cable-stayed member 10 and the removal member 20 are combined is installed at both ends of the first reinforcing bar network 3. As shown in FIG. 6, the transverse reinforcing bars (1) and longitudinal reinforcing bars (2) of the first reinforcing bar network (3) are disposed on both sides of the reinforcing bar lap joint box structure 100, so that the reinforcing bar lap joint box structure 100 and the first reinforcing bar network (3) are arranged to overlap each other. In this state, concrete (C) is poured and hardened to complete the first panel (A).

In the reinforcing bar joint box structure 100, the gap between the cable-stayed member 10 and the separation plate 20 is sealed by the water stopper 50, and the concrete poured into the excavation part of the first panel A ( C) does not flow into the space 19 inside the reinforcing bar joint box structure 100. However, concrete (C) may flow out to the back of the reinforcing bar joint box structure 100 through a gap or overflow in the hollow wall. However, even if some concrete leaks, in the present invention, the separator plate 20 is not in close contact with the cavity wall and is separated with the flange portions 14 and 15 in between, so it is difficult for the spilled concrete to move toward the separator plate 20. Accordingly, as in the prior art, the problem of not being able to remove the separator plate due to concrete flowing out toward the separator plate and hardening does not occur.

In addition, when the gap buffer 40 is installed as in other examples of the present invention, the concrete may harden on the back side of the gap buffer 40, which can be removed when excavating the second panel (B) area. . That is, when the first panel (A) is completed, the area adjacent to the first panel (A) is excavated in the same manner as above. In the process of excavating the ground, the excavation equipment can approach the first panel (A) and remove the concrete that has leaked from the first panel (A) and hardened on the back of the gap buffer (40). In this way, even if the bit of the excavation equipment is excavated close to the first panel to remove the spilled concrete, it only contacts the gap buffer (40) and does not contact the steel cable-stayed member (10) or the separation plate (20), so the bit can prevent damage. In the process of excavating the second panel area, the gap buffer 40 is removed together.

When excavation is completed, the separation plate 20 of the reinforcing bar joint box structure 100 is removed using a crane (not shown). The separation plate 20 can be separated from the cable-stayed member 10 by holding the separation plate 20 with a crane and pulling it upward. In addition, since the concrete that leaked and hardened to the rear of the reinforcing bar joint structure was removed during the excavation process of the second panel, it does not act as an obstacle in separating the separation plate 20 from the cable-stayed member 10. When the separation plate 20 is removed, the folded stop material 50 is unfolded.

Afterwards, the second reinforcing bar network (8) consisting of transverse reinforcing bars (4) and longitudinal reinforcing bars (5) is inserted into the second panel excavation area. At least one end of the second reinforcing bar network (8) has extended reinforcing bar networks (6, 7) installed to overlap the first reinforcing bar network (3) of the first panel (A). The width of the extended reinforcing bar networks 6 and 7 is narrower than that between the pair of side plate portions of the cable-stayed member 10, so as shown in Figure 8, the extended rebar network 6.7 is connected to the flat portion of the cable-stayed member 10 ( It can be placed as deep as 11). Referring to Figure 8, it can be seen that the first reinforcing bar network (3) of the first panel (A) and the second reinforcing bar network (8) of the second panel (B) are overlapped and joined to each other by the length indicated by reference number D. You can. Also, in this example, the reinforcing bar joint can be further strengthened by the joint reinforcing bars 30.

Once the arrangement of the second rebar network (8) is completed, concrete is poured and hardened to complete the second panel (B). The water-stop material 50 attached to the cable-stayed member 10 is buried inside the concrete (C) of the second panel (B) and can waterproof the basement floor of the building by blocking the inflow path of groundwater.

There are two ways to construct an underground continuous wall by constructing the first and second panels in the above manner. The first method places the first and second panels alternately over the entire area of the underground continuous wall. The first panel is constructed by installing reinforcing bar joint box structures symmetrically on both sides of the first reinforcing bar network. A second panel is installed between the first panels. That is, the second reinforcing bar network, in which the extended reinforcing bar network is installed at both ends, is inserted into the second panel and overlapped with the first panel on both sides. This is a method of installing leading and trailing panels alternately in an underground continuous wall.

The second method constructs the first panel by installing reinforcing bar joint box structures symmetrically on both sides of the first reinforcing bar network. And starting from the first panel, the second panel is continuously attached on both sides. That is, one side of the second rebar network of the second panel is lap-joined to the first panel by installing an extended rebar network. And a reinforcing bar joint box structure is installed on the other side of the second panel. The following second panel, which follows the preceding second panel for which construction has been completed, also has an extended rebar network installed on one side to be overlapped with the preceding second panel, and a reinforcing bar overlap box structure is installed on the other side. An underground continuous wall can be constructed in the above manner.

The reinforcing bar joint box structure according to the present invention can be used in both of the two methods of underground continuous wall construction methods mentioned above.

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

100 ... rebar layered box structure
10... straight member, 11... flat member,
12,13... a pair of side plates, 14,15... a pair of flange parts
20... Separator plate, 30... Joint rebar
40 ... gap buffer, 50,60 ... stopper material

Claims (7)

It is constructed at different times in an underground continuous wall and is intended to overlap reinforcing bar networks between adjacent panels.
It is buried inside the underground continuous wall, and includes a flat plate portion formed long in the depth direction, a pair of side plates protruding from both sides of the flat plate portion, and a width direction of the underground continuous wall from the pair of side plates. a cable-stayed member having a pair of flange portions each extending along;
A separator plate detachably coupled between a pair of side plate portions of the cable-stayed member;
Joint reinforcing bars formed along the longitudinal direction of the underground continuous wall and coupled through the flat portion; and
It is coupled to the pair of side plates, and when the cable-stayed member and the separation plate are combined, it is placed in the gap between the side plate and the separation plate to seal between the side plate and the separation plate, and the width of the underground continuous wall A cable-stayed reinforcing bar joint box structure, characterized in that it has a pair of water stoppers disposed to protrude along a direction. According to paragraph 1,
A concave fitting part is formed at one end of the pair of side plates and the separator plate, and an end of the other one of the pair of side plates and the separator plate is formed as an insertion part fitted into the fitting part, and the water stop material is By being folded and placed on the fitting portion, the space between the side plate portion and the separation plate is sealed,
When the separation plate is removed from the cable-stayed member, the water stop member is elastically deformed and spreads, and protrudes from the side plate portion along the width direction of the continuous wall. According to paragraph 1,
A pair of protruding rails are provided at ends of the pair of side plates, spaced apart from each other and facing each other, and a concave fitting portion into which the separator plate is inserted is formed between the pair of protruding rails,
The water stop material has a water stopper portion having a long zigzag cross section, and an insertion hole at the end of the water stop portion having a U-shaped cross section,
The insertion hole is fitted and coupled to a protruding rail disposed close to the flat portion of the pair of protruding rails, and the stopper portion is arranged to be spaced apart from the separation plate without contacting the separation plate. . According to paragraph 1,
The pair of flange portions extend from ends of the pair of side plate portions,
The separation plate is a cable-stayed reinforcing bar joint box structure, characterized in that it is disposed closer to the flat portion than to the flange portion along the longitudinal direction of the continuous wall. According to paragraph 1,
A cable-stayed reinforcing bar joint box structure made of a styrofoam material hard enough not to damage the bit when in contact with the bit of a ground excavator, and further comprising a gap buffer attached to the back of the separation plate. According to paragraph 1,
A cable-stayed type cable-stayed type made of a soft material hard enough not to damage the bit when in contact with the bit of a ground excavator, and further comprising a gap buffer attached to the rear surface of the pair of flange portions and the separator plate. Reinforcement layered box structure. A method of constructing an underground continuous wall in which reinforced concrete panels are continuously connected,
(a) After excavating the ground to form the first excavation section and inserting the first rebar network, in which a plurality of transverse and longitudinal reinforcing bars are connected, into the first excavation section, the cable-stayed type according to any one of claims 1 to 6 is installed. Installing a reinforcing bar joint box structure to be inserted between transverse reinforcing bars of the first reinforcing bar network, and pouring and curing concrete in the first excavation to complete the first panel;
(b) Excavating the ground next to the first panel to form a second excavation, and removing the separator plate from the cable-stayed rebar laminated box structure to create a space inside the cable-stayed rebar laminated box structure. Opening toward the second excavation portion and protruding the water stopper member to the outside of the cable-stayed member while unfolding; and
(c) A second rebar network in which a plurality of transverse rebars and longitudinal rebars are connected is inserted into the second excavation so that the transverse rebars of the second rebar network overlap with the transverse rebars and joint rebars of the first rebar network. An underground continuous wall construction method comprising: pouring and curing concrete in the second excavation section after placement.

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