JP2016089449A - Shear force transmission structure and construction method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shear force transmission structure that can be formed simply.SOLUTION: A shear force transmission structure 10 has steel plates 11, 12, a connecting bolt 13 and a nut 14, etc. The steel plate 11 is buried over an RC continuous wall 3a and an RC sidewall 4a. The steel plate 12 is buried in the RC sidewall 4a. The steel plates 11, 12 are disposed by aligning the position of holes 112, 122. The shaft of the connecting bolt 13 is inserted into the holes 112, 122, and the nut 14 is tightened on the tip. When an underground structure building frame by the RC sidewall 4a and a bottom slab 5 rises by buoyancy, the steel plate 12 rises and the connecting bolt 13 is pushed up, and rubber ring 131 provided around the shaft is destroyed and locked at the upper part of the hole 112 of the steel plate 11. Thereby, the buoyancy applied to the underground structure building frame is transmitted to the RC continuous wall 3a side as a shear force, and can be resisted by the gravity of the RC continuous wall 3a.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a shear force transmission structure between a retaining wall and an underground structural frame, and a construction method of the shear force transmission structure.

  When constructing underground structures such as shafts and underground tanks, for example, after building RC continuous wall 3 (reinforced concrete underground continuous wall) as a retaining wall, as shown in FIGS. 14 (a) and 14 (b), The inside will be excavated and the underground structure will be constructed.

  FIG. 14A is an example of a vertical shaft, in which an RC side wall 4 and a bottom plate 5 are constructed as an underground structural frame. FIG. 14B shows an example of an underground tank, in which an RC side wall 6 and a bottom plate 7 are constructed as an underground structural frame, and a roof 8 is provided on the top of the RC side wall 6. The RC connecting wall 3 and the RC side walls 4 and 6 are substantially cylindrical, and the RC side walls 4 and 6 are provided so as to be in contact with the inner peripheral surface of the RC connecting wall 3.

  In recent years, underground structures have a tendency to become larger and deeper, and the member dimensions are often determined not only by external forces such as earth pressure and water pressure, but also by safety against buoyancy. This tendency is particularly remarkable in the substantially cylindrical underground structural frame without the partition walls as described above. For this reason, there is a case where a shear force transmission structure is provided between the underground structural frame and the retaining wall, and the buoyancy of the underground structural frame is resisted by the weight of the retaining wall.

  For example, in Patent Document 1, after excavating the inside of the RC connection wall, a new shear reinforcement is connected to the mechanical joint of the shear reinforcement previously embedded in the RC connection wall, and concrete is placed at this location to place the RC connection wall. After the projecting part is formed in the structure, a shear force transmission structure is formed, and then concrete is placed inside the RC connection wall to construct an underground structural frame. Further, in Patent Documents 2 and 3, a steel retaining wall and an underground structure frame inside thereof are integrated by a perforated steel plate gibber provided in a steel retaining wall such as a steel sheet pile, a steel pipe sheet pile, or an H-shaped steel. Have been described.

Japanese Patent No. 3028053 JP 2001-146756 A JP 2002-13134

  However, the method of Patent Document 1 has a problem that the number of shearing rebars is enormous, and it takes time to mount. The construction of the shear force transmission structure is a critical type of work. During that time, the construction of the underground structure cannot be performed, and if it takes time to form the shear force transmission structure, the entire process will be affected.

  Also, if the concrete placed during the construction of the RC wall flows into the mechanical joints of the shear rebars, shear rebars that cannot be connected will come out. There was also a problem that occurred. In this respect, Patent Documents 2 and 3 are related to steel retaining walls such as steel sheet piles, and are not related to the RC continuous wall as described above.

  Further, in Patent Document 1, the shear force transmission structure has a shape protruding toward the underground structural body, and the underground structural body has a cross-sectional defect, which causes a problem of strength reduction. In addition, the steel bars in the underground structure around the shear force transmission structure have a complicated shape, and it takes time to process and assemble, and also requires time for formwork installation, concrete placement, and curing.

  The present invention has been made in view of the above problems, and an object thereof is to provide a shear force transmission structure that can be easily formed.

  1st invention for solving the subject mentioned above is a shear force transmission structure provided so that the contact surface of a retaining wall and an underground structure frame may cross | intersect, Comprising: It embeds over the said retaining wall and the said underground structure frame A first vertical steel plate having a locking portion on the underground structural frame side, a second vertical steel plate embedded in the underground structural frame, and the second when the underground structural frame is raised A locked portion that transmits shearing force by being locked to the locking portion as the steel plate rises, and a cushioning material disposed between the locked portion and the locking portion. A shearing force transmission structure characterized by comprising:

It is desirable that the first steel plate is disposed in a hollow portion on the surface of the earth retaining wall on the underground structure housing side.
The first steel plate is preferably provided with a hole as the locking portion, and the locked portion is passed through the hole.
Further, the second steel plate is provided with a hole, the first and second steel plates are arranged so that the positions of the holes are overlapped, and the locked portion has the buffer material around the shaft portion. The bolts are provided, the shafts are passed through the holes of the first and second steel plates, and the first and second steel plates are made of nuts attached to the heads of the bolts and the ends of the shafts. It is desirable to be pinched.
In addition, the first and second steel plates have rebar insertion holes, the first steel plate is arranged through the rebar insertion holes through the horizontal rebars of the retaining wall, and the second steel plate is the rebar insertion holes. It is desirable to be arranged through the horizontal rebar of the underground structural frame.

  2nd invention is the construction method of the shear force transmission structure provided so that the contact surface of a retaining wall and an underground structure frame may cross | intersect, Comprising: The process (a) which constructs a retaining wall on the ground, and the said retaining wall And a step (b) for constructing an underground structure in the excavation part excavating the side ground, and in the step (a), the earth retaining wall protrudes from the earth retaining wall to the underground structure body, A first steel plate in the vertical direction having a locking portion at the protruding portion is embedded, and in the step (b), the second steel plate in the vertical direction and the above-mentioned at the time of ascent of the underground structure housing are embedded in the underground structure housing. A locked portion that transmits shearing force by being locked to the locking portion as the second steel plate rises, and a buffer disposed between the locked portion and the locking portion A method of constructing a shearing force transmission structure characterized in that a material is embedded.

  In the step (a), the earth retaining wall is constructed by placing a formwork around the end of the first steel plate on the base structure side and placing concrete, and in the step (b) It is desirable to construct the underground structural frame by removing the formwork and placing concrete of the underground structural frame.

  When the shear force transmission structure of the present invention is arranged at a location where the retaining wall and the underground structural frame are in contact with each other, when the buoyancy acts on the underground structural frame and rises, the second steel plate in the underground structural frame is also Ascending, the cushioning material is crushed and the locked portion is locked to the locking portion of the first steel plate. The first steel plate is buried over the retaining wall and the underground structure. When the locked part is locked, the buoyancy applied to the underground structure is transmitted to the retaining wall as shearing force, and the gravity of the retaining wall Can resist buoyancy. Thus, in the present invention, shear force can be transmitted by a structure that can be easily formed using two steel plates, etc., and the thickness of the member can be reduced by integrating the underground structural frame with the earth retaining wall. And it becomes advantageous in terms of cost.

  In addition, by constructing a retaining wall with a hollow part by placing concrete using a box formwork and arranging a shearing force transmission structure in this hollow part, there is a cross-sectional defect in the underground structural frame. The wall thickness can be reduced without any cost, which is advantageous in terms of cost. The steel plate can be easily fixed using the retaining wall and the horizontal reinforcing bar of the underground structure.

  In addition, the two steel plates are arranged with the positions of the holes aligned, the shaft portion of the connecting bolt is inserted, and the nut is tightened, so that the connecting bolt is the locked portion and the hole of the steel plate is the locking portion. The transmission structure can be easily formed, and the construction period can be shortened and the cost can be reduced. Moreover, both steel plates can be held using connecting bolts and nuts to prevent separation. Furthermore, by providing a cushioning material around the shaft part of the connecting bolt, even when the underground structural frame part near the shearing force transmission structure is slightly lowered due to the upward load during construction of the underground structural frame, the shaft of the connecting bolt Since the cushioning material below the portion is easily crushed, the lowering width of the portion can be absorbed, and no load is applied to the connecting bolt.

  The present invention can provide a shear force transmission structure that can be easily formed.

The figure which shows arrangement | positioning of the shear force transmission structure 10 The figure which shows the structure of the shear force transmission structure 10 The figure which shows the steel plates 11 and 12 The figure explaining transmission of the shearing force by the shearing force transmission structure 10 The figure explaining the construction method of the shear force transmission structure 10 The figure explaining the construction method of the shear force transmission structure 10 The figure explaining the construction method of the shear force transmission structure 10 The figure explaining the construction method of the shear force transmission structure 10 The figure explaining the construction method of the shear force transmission structure 10 The figure explaining the construction method of the shear force transmission structure 10 The figure which shows the shearing force transmission structure 10a The figure explaining transmission of the shearing force by the shearing force transmission structure 10a The figure which shows the shearing force transmission structure 10b Diagram showing retaining wall and underground structure

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

[First embodiment]
(1. Shear force transmission structure 10)
FIG. 1 is a diagram showing an arrangement of a shear force transmission structure 10 according to the first embodiment of the present invention. In this embodiment, the RC connection wall 3a which is a retaining wall is provided in the ground 2, and the underground structure frame is provided in the excavation part 22 which excavated the inner side. The underground structural frame of this embodiment is a vertical shaft, and has RC side walls 4a and a bottom plate 5.

  The RC continuous wall 3a and the RC side wall 4a are constructed by placing concrete reinforcing bars such as vertical reinforcing bars in the vertical direction and horizontal reinforcing bars in the horizontal direction. The RC continuous wall 3a and the RC side wall 4a are substantially cylindrical, and the inner and outer RC continuous wall 3a and the RC side wall 4a are in contact with each other on the entire surface. The shear force transmission structure 10 is provided so as to cross this contact surface.

  The shear force transmission structure 10 transmits buoyancy applied to the underground structural frame (RC side wall 4a, bottom plate 5) as shearing force from the RC side wall 4a to the RC continuous wall 3a, and resists it by the gravity of the RC continuous wall 3a.

  As shown in FIG. 1, in the present embodiment, a plurality of shear force transmission structures 10 are provided at intervals in the vertical direction. A plurality of shear force transmission structures 10 are arranged at equal intervals along the circumferential direction of the RC continuous wall 3a. FIG. 1 shows a partial shear force transmission structure 10 in the circumferential direction. However, the arrangement of the shear force transmission structure 10 is not limited to this. For example, one long shear force transmission structure 10 can be arranged continuously in the vertical direction.

(2. Configuration of shear force transmission structure 10)
FIG. 2 is a diagram showing a configuration of the shear force transmission structure 10. FIG. 2A shows a horizontal section of the shear force transmission structure 10, and FIG. 2B shows a vertical section of the shear force transmission structure 10. 2A is a cross section taken along line BB in FIG. 2B, and FIG. 2B is a cross section taken along line AA in FIG.

  As shown in FIGS. 2A and 2B, the shear force transmission structure 10 includes a steel plate 11 (first steel plate), 12 (second steel plate), a connecting bolt 13 (locked portion), and a nut 14. Etc. The shear force transmission structure 10 is disposed in the recessed portion 30 on the inner surface of the RC connecting wall 3a (the surface on the RC side wall 4a side).

  The steel plate 11 has a reinforcing bar insertion hole 111 and a hole 112 (locking portion), and is arranged in the vertical direction in the recessed portion 30. As shown in FIG. 3A, a plurality of reinforcing bar insertion holes 111 and holes 112 are provided in the vertical direction along two parallel rows. The steel plate 11 is embedded over the RC continuous wall 3a and the RC side wall 4a. That is, a part including the reinforcing bar insertion hole 111 is embedded in the RC connecting wall 3a, and the remaining part including the hole 112 is embedded in the RC side wall 4a.

  The steel plate 12 is embedded in the RC side wall 4a. The steel plate 12 has a reinforcing bar insertion hole 121 and a hole 122 and is arranged in the vertical direction. As shown in FIG. 3B, a plurality of reinforcing bar insertion holes 121 and holes 122 are provided in the vertical direction along each of two parallel rows.

  In the RC connecting wall 3a, a reinforcing bar made up of a vertical reinforcing bar 31 and a horizontal reinforcing bar 32 is embedded, and the horizontal reinforcing bar 32 is passed through the reinforcing bar insertion hole 111 of the steel plate 11. Vertical reinforcing bars 41 and horizontal reinforcing bars 42 are also embedded in the RC side wall 4 a, and the horizontal reinforcing bars 42 are passed through the reinforcing bar insertion holes 121 of the steel plate 12. Thereby, the position of the steel plates 11 and 12 is fixed.

  The steel plates 11 and 12 are arranged so that the positions of the holes 112 and 122 are aligned. The steel plates 11 and 12 are held so as not to be separated by using connecting bolts 13 and nuts 14.

  The connecting bolt 13 has a head portion and a shaft portion having a smaller diameter than the head portion, and the shaft portion of the connecting bolt 13 is inserted into the holes 112 and 122 where the steel plates 11 and 12 overlap from the steel plate 12 side. The tip of the shaft portion protrudes from the steel plate 11, and the nut 14 is tightened at this tip. Thereby, the steel plates 11 and 12 are prevented from being sandwiched and separated by the head of the connecting bolt 13 and the nut 14. Here, the nut 14 is not tightened tightly, and the steel plates 11 and 12 are made slidable with respect to the head of the connecting bolt 13 and the nut 14.

  A rubber ring 131 as a buffer material is provided around the shaft portion of the connecting bolt 13, and when the shaft portion is inserted into the holes 112 and 122, the rubber ring is between the shaft portion and the inner peripheral surface of the holes 112 and 122. It is filled with 131. In addition to the rubber ring 131, a foamed polystyrene ring or the like can be used as the buffer material.

(3. Transmission of shear force by the shear force transmission structure 10)
The shearing force transmission structure 10 of the present embodiment has a structure for transmitting a shearing force by locking the connecting bolt 13 (locked portion) in the hole 112 (locking portion) of the steel plate 11. This is illustrated in FIG. 4, and FIGS. 4A and 4B are diagrams each showing a vertical section of the main part of the shear force transmission structure 10.

  That is, from the initial state shown in FIG. 4 (a), when the underground structural frame by the RC side wall 4a and the bottom slab 5 rises by buoyancy, the steel plate 12 rises and pushes up the connecting bolt 13 as shown in FIG. 4 (b). . Then, the rubber ring 131 is crushed and the shaft portion of the connecting bolt 13 is locked at the upper portion of the hole 112 of the steel plate 11. Thereby, the buoyancy applied to the underground structural frame is transmitted to the RC connection wall 3a side as a shearing force, and can be resisted by the gravity of the RC connection wall 3a.

(4. Method for constructing shearing force transmission structure 10)
Next, the construction method of the shear force transmission structure 10 will be described with reference to FIGS. 5 to 9, (a) is a vertical section similar to FIG. 1, and (b) is a horizontal section taken along line CC in FIG. 5 (a). FIGS. 10A and 10B are views showing a horizontal cross section similar to FIGS. 5 to 9B.

  In the present embodiment, first, as shown in FIGS. 5A and 5B, the ground 2 is excavated to provide the excavation groove 21 in order to construct the RC connection wall 3a.

  Thereafter, as shown in FIGS. 6A and 6B, the steel plate 11 is placed in the excavation groove 21. The steel plate 11 is attached in advance to a reinforcing bar having a vertical reinforcing bar 31 and a horizontal reinforcing bar 32, and the steel plate 11 is also arranged by building the reinforcing bar into the excavation groove 21. In addition, illustration of a vertical reinforcing bar, a horizontal reinforcing bar, etc. is abbreviate | omitted in the (a) figure. The same applies to the following FIGS.

  The steel plate 11 is attached to the reinforcing bar rod by passing the horizontal reinforcing bars 32 through the reinforcing bar insertion holes 111. A box forming mold 40 is provided in advance around the end including the hole 112 inside the steel plate 11 (on the RC side wall 4a side).

  Thereafter, concrete is placed in the excavation groove 21. As shown in FIGS. 7A and 7B, the concrete is filled in a portion other than the inside of the mold 40, and when the concrete is hardened, the RC continuous wall 3a is constructed. A steel plate 11 is embedded in the RC continuous wall 3a, but an inner end portion of the steel plate 11 protrudes from the RC continuous wall 3a. The protruding portion includes a hole 112.

  In this embodiment, after the construction of the RC connection wall 3a, as shown in FIGS. 8A and 8B, the inside of the RC connection wall 3a is excavated to form the excavation part 22, and the formwork 40 is removed. . The part from which the mold 40 is removed becomes a recess 30. A bottom slab 5 made of concrete or the like is constructed at the bottom of the excavation part 22.

  Next, as shown in FIGS. 9A and 9B, the steel plate 12 is disposed so as to overlap the protruding portion of the steel plate 11. At this time, the positions of the holes 112 and 122 of the steel plates 11 and 12 are aligned. Then, as shown in FIG. 10 (a), the shafts of the connecting bolts 13 are passed from the steel plate 12 side through the holes 112, 122 where the steel plates 11, 12 overlap, and a nut 14 is attached to the tip of the shaft protruding from the steel plate 11. Tighten. As described above, the rubber ring 131 is attached around the shaft portion of the connecting bolt 13.

  Moreover, the vertical reinforcing bar 41 and the horizontal reinforcing bar 42 of the RC side wall 4a are arranged inside the RC connecting wall 3a. At this time, the horizontal reinforcing bar 42 is passed through the reinforcing bar insertion hole 121 of the steel plate 12.

  Then, as shown in FIG.10 (b), the concrete of RC side wall 4a is laid inside RC connection wall 3a. When the concrete hardens, the RC side wall 4a is constructed. A steel plate 12, a connecting bolt 13, a rubber ring 131, a nut 14 and the like are embedded in the RC side wall 4a. In this way, the shear force transmission structure 10 described with reference to FIG.

  The concrete of the RC side wall 4a is placed in order from the bottom to the top in several lots. At this time, even when the concrete in the vicinity of the shear force transmission structure 10 is slightly lowered by the load of the concrete in the upper lot, the rubber ring 131 below the shaft portion of the connecting bolt 13 is easily crushed, so the concrete on the side wall Can be absorbed, and the load is not applied to the connecting bolt 13 but is supported by the bottom plate 5 or the like.

  As described above, in this embodiment, the shear force transmission structure 10 is arranged at a location where the RC connecting wall 3a and the RC side wall 4a are in contact with each other, so that the buoyancy is generated in the underground structural frame composed of the RC side wall 4a and the bottom plate 5. When acting and rising, the steel plate 12 is also raised, the rubber ring 131 is crushed as described above, and the connecting bolt 13 is locked in the hole 112 of the steel plate 11. Thereby, the buoyancy applied to the underground structural frame is transmitted to the RC connection wall 3a as a shearing force, and the buoyancy can be resisted by the gravity of the RC connection wall 3a. Thus, in this embodiment, shear force can be transmitted by a structure that can be easily formed using the two steel plates 11, 12 and the connecting bolt 13, etc., and by integrating the underground structural frame and the RC connecting wall 3a. It is also possible to reduce the thickness of the member, which is advantageous in terms of construction and cost.

  Further, the RC connecting wall 3a having the recessed portion 30 is constructed by placing concrete using the boxing mold 40, and the shear force transmitting structure 10 is disposed in the recessed portion 30. There is no cross-sectional defect in the side wall 4a, and the wall thickness can be reduced, which is advantageous in cost. Moreover, the steel plates 11 and 12 can be easily fixed using the horizontal reinforcing bars 32 and 42 of the RC continuous wall 3a and the RC side wall 4a.

  In this embodiment, the two steel plates 11 and 12 are arranged with the positions of the holes 112 and 122 aligned, the shaft portion of the connecting bolt 13 is inserted, and the nut 14 is tightened, whereby the shear force transmission structure 10 is obtained. Can be formed easily, and the construction period can be shortened and the cost can be reduced. Moreover, both the steel plates 11 and 12 can be hold | maintained using the connection bolt 13 and the nut 14, and separation can be prevented.

  Furthermore, by providing the rubber ring 131 around the shaft portion of the connecting bolt 13, when the RC side wall 4a is constructed, the concrete in the vicinity of the shear force transmission structure 10 is slightly lowered by the load of the concrete in the upper lot. Since the rubber ring 131 below the shaft portion of the connecting bolt 13 is easily crushed, the concrete descending width of the side wall can be absorbed, and the load is not applied to the connecting bolt 13 and is supported by the bottom plate 5 or the like. Similarly, the connecting bolt 13 does not constrain vertical displacement or radial displacement associated with a temperature drop or drying shrinkage of the RC side wall 4a. Therefore, even in these cases, no stress is generated on the RC side wall 4a, and no cracks are generated due to the stress. The distance between the shaft portion of the connecting bolt 13 and the inner peripheral surfaces of the holes 112 and 122 (the thickness of the rubber ring 131) is such that the concrete descending width during the construction of the RC side wall 4a described above, the temperature drop of the RC side wall 4a, It can be determined in advance in consideration of displacement due to drying shrinkage or the like. For example, it is about 20-30 mm.

  However, the present invention is not limited to this. For example, in the present embodiment, the RC continuous wall 3a and the RC side wall 4a are in contact with each other around the entire circumference, but at least part of them is in contact, and the shear force transmission structure 10 may be provided in the adjacent portion. Further, in the present embodiment, the RC continuous wall 3a and the RC side wall 4a are substantially cylindrical, but other shapes such as a rectangular tube may be used. In addition, this embodiment can be applied not only to a vertical shaft but also to an underground tank as described with reference to FIG.

  Next, another example of the shear force transmission structure of the present invention will be described as second and third embodiments. Each embodiment will mainly describe differences from the first embodiment, and the same points will be denoted by the same reference numerals in the drawings and the like, and description thereof will be omitted.

[Second Embodiment]
FIG. 11 is a diagram showing a shear force transmission structure 10a according to the second embodiment. FIG. 11A shows a horizontal section of the shear force transmission structure 10a, and FIG. 11B shows a vertical section of the shear force transmission structure 10a. 11A is a cross section taken along line DD in FIG. 11B, and FIG. 11B is a cross section taken along line CC in FIG. 11A.

  As shown in FIG. 11, the shear force transmission structure 10a includes a steel plate 11 (first steel plate) and 12a (second steel plate). The steel plate 11 is the same as that of the first embodiment.

  The steel plate 12a is embedded in the RC side wall 4a. The steel plate 12a has a reinforcing bar insertion hole 121 and a projection 124 (locked portion), and is arranged in the vertical direction. As shown in FIG. 11B, a plurality of reinforcing bar insertion holes 121 and protrusions 124 are provided in a vertical direction along two parallel rows. A rubber ring 125 is provided around the protrusion 124 as a cushioning material. The steel plates 11 and 12a are arranged so that the protrusions 124 of the steel plate 12a are passed through the holes 112 (locking portions) of the steel plate 11, and at this time, a rubber ring is formed between the inner peripheral surface of the holes 112 and the protrusions 124. Filled with 125.

  Similarly to the first embodiment, the vertical reinforcing bar 31 and the horizontal reinforcing bar 32 are embedded in the RC continuous wall 3 a, and the horizontal reinforcing bar 32 is passed through the reinforcing bar insertion hole 111 of the steel plate 11. Vertical reinforcing bars 41 and horizontal reinforcing bars 42 are also embedded in the RC side wall 4a, and the horizontal reinforcing bars 42 are passed through the reinforcing bar insertion holes 121 of the steel plate 12a. Thereby, the steel plates 11 and 12a are fixed.

  The shearing force transmission structure 10a of the present embodiment has a structure for transmitting a shearing force by engaging a protrusion 124 (locked portion) of the steel plate 12a with a hole 112 (locking portion) of the steel plate 11. . This is illustrated in FIG. 12, and FIGS. 12 (a) and 12 (b) are views showing a vertical section of the main part of the shear force transmission structure 10a.

  That is, from the initial state shown in FIG. 12 (a), when the underground structural frame by the RC side wall 4a and the bottom slab 5 rises by buoyancy, the steel plate 12a rises and the rubber ring 125 is crushed as shown in FIG. 12 (b). Thus, the protrusion 124 is locked at the upper portion of the hole 112 of the steel plate 11. Thereby, like the above, the buoyancy applied to the underground structural frame is transmitted to the RC connection wall 3a side as a shearing force and can be resisted by the gravity of the RC connection wall 3a.

[Third embodiment]
FIGS. 13A and 13B are views showing a vertical section and a horizontal section, respectively, of the main part of the shear force transmission structure 10b of the third embodiment. 13A is a cross section taken along line FF in FIG. 13B, and FIG. 13B is a cross section taken along line EE in FIG.

  The shear force transmission structure 10b of this embodiment includes steel plates 11b (first steel plates) and 12b (second steel plates), and a hook-like portion 126 (locked portion) provided on the steel plate 12b is provided on the steel plate 11b. By being locked by the box-shaped portion 115 (locking portion), a shearing force is transmitted.

  As shown in the figure, the hook-shaped portion 126 protrudes from the side surface of the steel plate 12b, and the tip is bent upward. The box-shaped portion 115 is provided on the side surface of the steel plate 11b, and the lower surface is opened. Cushioning materials 116a and 116b are respectively disposed on the upper and side portions of the internal space of the box-shaped portion 115, and a buffering material 116c is provided on the lower portion of the front surface of the box-shaped portion 115.

  As shown in FIG. 13C, the steel plate 12b is arranged by inserting the bent portion at the tip of the hook-like portion 126 from below the box-like portion 115 of the steel plate 11b. At this time, as shown in FIGS. 13A and 13B, the cushioning materials 116 a, 116 b, and 116 c are disposed between the hook-shaped portion 126 and the box-shaped portion 115.

  Note that the configuration omitted in description is substantially the same as that of the first embodiment. For example, the steel plate 11b is embedded over the RC connecting wall 3a and the RC side wall 4a as in the first embodiment, and the steel plate 12b is embedded in the RC side wall 4a. The portions shown in FIGS. 13A and 13B are located in the RC side wall 4a. The steel plates 11b and 12b are also provided with the same reinforcing bar insertion holes as in the first embodiment, and the horizontal reinforcing bars 32 and 42 of the RC connecting wall 3a and the RC side wall 4a are passed therethrough, respectively.

  In the present embodiment, when the underground structural frame by the RC side wall 4a and the bottom slab 5 rises by buoyancy, the steel plate 12b rises as shown in FIG. 13 (d), and the cushioning material 116a above the internal space of the box-shaped portion 115 The cushioning material 116c at the lower part of the front surface of the box-shaped part 115 is crushed, and the hook-shaped part 126 is locked by the box-shaped part 115 of the steel plate 11b. Thus, as described above, the buoyancy applied to the underground structural frame is transmitted to the RC connection wall 3a as a shearing force, and can be resisted by the gravity of the RC connection wall 3a.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea disclosed in the present application, and these are naturally within the technical scope of the present invention. Understood.

2; Ground 3, 3a; RC connection walls 4, 4a, 6; RC side walls 5, 7; Bottom plate 8; Roof 10, 10a, 10b; Shear force transmission structures 11, 11b, 12, 12a, 12b; Bolt 14; Nut 21; Excavation groove 22; Excavation portion 30; Depression portion 31, 41; Vertical rebar 32, 42; Horizontal rebar 40; Formwork 111, 121; Rebar insertion hole 112, 122; Rubber ring 126; hook-shaped portion 115; box-shaped portions 116a, 116b, 116c;

Claims (7)

A shear force transmission structure provided to cross the contact surface between the retaining wall and the underground structural frame,
A first steel plate in a vertical direction that is embedded over the retaining wall and the underground structure housing and has a locking portion on the underground structure housing side;
A second steel plate in the vertical direction embedded in the underground structural frame;
A locked portion that transmits shearing force by being locked to the locking portion as the second steel plate rises when the underground structure is raised,
A cushioning material disposed between the locked portion and the locking portion;
A shearing force transmission structure characterized by comprising:   The shear force transmission structure according to claim 1, wherein the first steel plate is disposed in a hollow portion on a surface of the earth retaining wall on the underground structure housing side. The first steel plate is provided with a hole which is the locking portion,
The shearing force transmitting structure according to claim 1, wherein the locked portion is passed through the hole. A hole is provided in the second steel plate,
The first and second steel plates are arranged so as to overlap the positions of the holes,
The locked portion is a bolt provided with the cushioning material around the shaft portion, the shaft portion is passed through the holes of the first and second steel plates, the bolt head and the end of the shaft portion The shear force transmission structure according to claim 3, wherein the first and second steel plates are sandwiched between nuts attached to the portion. The first and second steel plates have reinforcing bar insertion holes,
The first steel plate is arranged through the reinforcing bar insertion hole through the horizontal reinforcing bar of the retaining wall,
The shear force transmission structure according to any one of claims 1 to 4, wherein the second steel plate is disposed through the reinforcing bar insertion hole through a horizontal reinforcing bar of the underground structural frame. A method for constructing a shear force transmission structure provided so as to intersect a contact surface between a retaining wall and an underground structural frame,
A step (a) of constructing a retaining wall on the ground;
A step (b) of constructing an underground structural frame in an excavation part excavating the ground on the side of the retaining wall;
Comprising
In the step (a),
To the retaining wall,
The first steel plate in the vertical direction protruding from the earth retaining wall to the underground structure housing side and having a locking portion at the protruding portion is embedded,
In the step (b),
In the underground structure enclosure,
A second steel plate in the vertical direction;
A locked portion that transmits shearing force by being locked to the locking portion as the second steel plate rises when the underground structure is raised,
A cushioning material disposed between the locked portion and the locking portion;
A method for constructing a shearing force transmission structure, wherein the structure is embedded. In the step (a), the retaining wall is constructed by placing a formwork around the end of the first steel plate on the side of the underground structure and placing concrete.
The method for constructing a shear force transmission structure according to claim 6, wherein in the step (b), the underground structure body is constructed by removing the formwork and placing concrete of the underground structure body. .

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