JPH10195866A - Underground continuous wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an underground continuous wall by which even if the wall thickness is small, proof stress can be ensured. SOLUTION: An underground continuous wall 11 comprises concrete 13 and a reinforcement structure 14 which is buried in the concrete 13 a and reinforces the concrete 13. In that case, the reinforcement structure 14 comprises a reinforced cage 16 and a shape steel 15, the reinforced cage 16 comprises a pair of reinforced cage structures 18 arranged opposite to one drilled surface 17 of the underground continuous wall 11, the shape steeel 15 is disposed between the reinforced cage structures 18, and both ends in the cross direction of the underground continuous wall 11 are fixed close to both reinforced cage structures 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground continuous wall which is installed in the ground as a foundation of a structure or a part of an underground structure, or as a mountain retaining / water stopping wall.

[0002]

2. Description of the Related Art As this kind of underground continuous wall, the one shown in FIGS. 2 and 3 is known. FIG. 2: is a figure showing the example at the time of constructing the underground continuous wall 1 by RC structure, and the cross section of the underground continuous wall 1 is shown in the figure. The underground continuous wall 1 is composed of concrete 2 and a reinforcing structure 3 buried in the concrete 2, and the reinforcing structure 3 is constituted by a reinforcing cage 5.

[0003] On the other hand, FIG. 3 is a diagram showing an example in which the underground continuous wall 1 is constructed by the SRC structure. In this case, the reinforcing structure 3 is composed of a steel cage 5 and a steel frame 6 made of H-shaped steel disposed therein. Rebar basket 5
Are composed of a vertical bar 7 and a horizontal bar 8 each made of a reinforcing bar, and the steel frame 6 is disposed inside the reinforcing bar 5 in a state where the reinforcing bar 5 is not in contact with the reinforcing bar 5.

[0004]

The underground continuous wall, besides having a function as a support pile, has a retaining wall and a water stop wall against soil water pressure, an earthquake-resistant wall for processing in-plane shear force,
It is possible to have a function as a composite wall capable of resisting in-plane and out-of-plane forces by being integrated with the post-cast body.

In recent years, in particular, in recent years, in order to effectively use an underground space, an underground continuous wall having a function of a retaining wall has been often used at the outer peripheral portion of a building. That is,
If the underground outer wall, which is the main structure, is provided inside the temporary retaining wall, the effective space of the underground floor will decrease,
An underground continuous wall that can be used for both will be provided just below the boundary of the site, and the basement floor will be used effectively to fill the site. Under such circumstances, there has been a demand for an underground continuous wall which has the above-mentioned functions, can reduce the wall thickness, can effectively use the underground space, and can reduce the cost.

Accordingly, an object of the present invention is to provide an underground continuous wall capable of securing proof stress even if the wall thickness is small.

[0007]

Means for Solving the Problems In view of the above circumstances, the present invention employs the following means. That is, the underground continuous wall according to claim 1 is an underground continuous wall composed of concrete and a reinforcing structure embedded in the concrete and reinforcing the concrete, wherein the reinforcing structure is A steel bar, and the rebar cage comprises one rebar cage component disposed opposite to one excavation surface of the underground continuous wall, and the other rebar cage component disposed opposite to the other excavation surface. The steel pattern is disposed between the one and the other rebar cage structures, and both ends of the underground continuous wall in the wall thickness direction are connected to the one and the other rebar cage structures. It is characterized in that it is fixed in contact with the other.

In the underground continuous wall, since the steel mold is provided between the reinforcing steel cage components disposed opposite to the excavation surface, and the steel shape is fixed to the reinforcing steel cage structure, Since the steel bars and the mold steel are integrated and the composition of the mold steel can be increased, the sectional performance is improved as compared with the conventional SRC underground continuous wall.

[0009] The underground continuous wall according to claim 2 is the underground continuous wall according to claim 1, wherein the rebar cage structure includes a plurality of vertical bars arranged so as to extend vertically. It consists of multiple horizontal streaks arranged perpendicular to the muscles,
The section steel is arranged so as to extend in the up-down direction, and a flange of the section steel is made of an H-section steel in a state parallel to a wall surface of the underground continuous wall, and the flange is formed on the rebar cage structure. Characterized by being fixed to

Since the underground continuous wall has the above-described structure, the section steel and the reinforcing bar can be fixed favorably. Further, at the time of assembling the reinforcing bar cage, accurate processing can be performed by using the reinforcing bar as a ruler.

The underground continuous wall according to claim 3 is the underground continuous wall according to claim 2, wherein the horizontal streak is flared to the flange of the H-shaped steel.

In this underground continuous wall, the reinforcing bar and the H-section steel are fixed by the above-described configuration.
By arranging the vertical streaks on the inner side of the underground continuous wall with respect to the horizontal streaks, it is possible to manufacture a rebar cage having a small thickness and a high strength. Thereby, the earth removal at the time of underground diaphragm wall construction will also be reduced, and industrial waste can be reduced. In addition, since the H-shaped steel and the reinforcing bar are fixed as described above, the stress transmission between the steel frame and the concrete can be improved.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a part of a cross section of the underground continuous wall 11 in the present embodiment. As shown in FIG. 1, an underground continuous wall 11 is constructed in a ground 12, and concrete 13 and a reinforcing structure 14 buried in the concrete 13 and reinforcing the concrete 13.
It is composed of The reinforcing structure 14 includes a steel bar 15 made of an H-shaped steel and a reinforcing cage 16, and the reinforcing cage 16 is a pair of reinforcing bars arranged to face the excavation surface 17 of the underground continuous wall 11. It is composed of a cage component 18.

The reinforcing bar cage assembly 18 is composed of a plurality of vertical bars 19 arranged to extend vertically and a plurality of horizontal bars 20 arranged perpendicular to the vertical bars 19. The vertical stripes 19 and the horizontal stripes 20 are formed in a lattice shape. FIG. 1 shows a cross section of the reinforcing bar cage structure 18 in a horizontal plane. Further, the horizontal streak 20 is arranged so as to be in contact with the outer surface 22 a of the flange 22 of the section steel 15 and is flared to the outer surface 22 a of the flange 22. Further, the vertical streaks 19 are arranged so as to be located inside the underground continuous wall 11 with respect to the horizontal streaks 20.

The above is the main configuration of the present embodiment. Next, a method of constructing the underground continuous wall 11 will be described. First, an excavation hole for constructing the underground continuous wall 11 is excavated in the ground 12, and a reinforcing structure 14 is manufactured. The production of the reinforcing structure 14 is performed as follows. First, a plurality of horizontal streaks 20 are arranged so as to be orthogonal to the shape steel 15 on a flange 22 of a shape steel 15 made of a H-shaped steel having a thickness smaller than the planned wall thickness t of the underground continuous wall 11 by about 200 mm.
0 is flared on the outer surface 22a of the flange 22. At the same time, the vertical streaks 19 are arranged inside the horizontal streaks 20 at a predetermined pitch, and these are bound to the horizontal streaks 20. On this occasion,
At the position of the section steel 15, the arrangement of the vertical bars 19 is omitted.

Thus, the flange 22 of the section steel 15 is
On the other hand, a unit in which the reinforcing bar cage structure 18 composed of the vertical bars 19 and the horizontal bars 20 is fixed is manufactured as a unit, and this unit is formed as a reinforcing structure 14 in a digging hole for constructing the underground continuous wall 11. Build in. When the height of the unit is shorter than the vertical length required for the underground continuous wall 11, a similar unit was further manufactured and the units were joined in the vertical direction. It is supposed to be built in a drill hole as a reinforcing structure 14.
At this time, the joining of the mold steels 15 between the units is performed by high-strength bolts, and the joining of the reinforcing bars 16 is performed by lap joints.

Next, concrete 13 is poured into the excavation hole. At this time, as shown in FIG. 1, one tremy tube 24 is installed between each of the steel molds 15 so that concrete flows in from the tremy tube 24. As described above, the elements constituting the underground continuous wall 11 are installed in the ground 12. Thereafter, another excavation hole is excavated adjacent to the installed element, the reinforcing structure 14 is erected in the same procedure, concrete is cast, and the element is formed. And the underground continuous wall 11 is completed.

The underground continuous wall 1 according to the present embodiment has been described above.
This is the first construction method. In this underground continuous wall 11,
Compared with a conventional underground continuous wall using a general RC structure, the wall thickness can be reduced and the wall thickness can be made the same for the same external force because the shape steel 15 bears the stress. In some cases, bending and shear strength can be increased. Therefore, by reducing the wall thickness, the space inside the underground structure using the underground continuous wall can be effectively used, and the site can be effectively used.

Further, according to the underground continuous wall 11, the shape steel 15
Is added to increase the rigidity of the reinforcing cage 16 and the conventional R
The necessity of assembling rebars and stiffening steel materials required for the underground continuous wall having the C structure can be eliminated, and the man-hours and cost of rebar car assembly can be reduced.

The above is an advantage when the underground continuous wall 11 of the present embodiment is compared with an underground continuous wall having an RC structure.
The underground continuous wall 11 has the following advantages even when compared with an underground continuous wall having a general SRC structure.

In the underground continuous wall having the SRC structure conventionally proposed, a steel frame having a size smaller than that of the reinforced cage is arranged inside the reinforced cage. Since the shape of the shape steel 15 is increased to be integrated with the reinforcing steel cage 16, the sectional performance of the underground continuous wall 11 is improved, and the proof stress is increased. Further, the position of the mold steel 15 can be easily maintained. Furthermore, assuming the same external force as the conventional underground continuous wall of the SRC structure, in the present embodiment, the wall thickness can be reduced, and as a result, the space inside the underground structure is effectively used. It can be used for In addition, by reducing the wall thickness, the earth removal accompanying excavation is reduced, and industrial waste can be reduced.

In the present embodiment, the steel 15
The structure is such that the reinforcing bar cage structure 18 is fixed to the flange 22 of the steel bar, so that the shape steel and the reinforcing bar cage can be fixed favorably. Further, the steel bar 15 can be used as a ruler when assembling the reinforcing cage 16, and the assembling accuracy of the reinforcing cage 16 is improved.

Further, in the present embodiment, a configuration is employed in which the horizontal streak 20 is flared to the flange 22. By arranging the vertical bars 19 inside the horizontal bars 20 by doing in this way, not only can the reinforcing steel cage 16 integrated with the section steel 15 have a small thickness and a large strength, but also the The stress transmission with the concrete 13 becomes smooth, and the cumulative strength required for the SRC structure can be secured.

In the above-described embodiment, the horizontal streak 20 is configured to be flared to the flange 22. However, it is not necessary to flare all the portions where the horizontal streak 20 contacts the flange 22. You may make it thin out suitably.

In the above embodiment, the reinforcing bar cage 18 is formed by disposing the vertical bar 19 inside the horizontal bar 20.
The configuration of 8 is not limited to this, and the vertical streaks 19 may be arranged outside the underground continuous wall 11 as viewed from the horizontal streaks 20. Also, a combination of a rebar cage component 18 having a vertical bar 19 disposed inside the horizontal bar 20 and a rebar cage component 18 having a vertical bar 19 disposed outside the horizontal bar 20 may be used.

Further, in the above embodiment, the horizontal streaks 20 are all fixed to the outer surface 22a of the flange 22, but the horizontal streaks 20 are fixed to the underground continuous wall 1 in the flange 22.
1 may be fixed inside. In this case, a hole is formed in the vicinity of the edge of the web of the section steel 15 which contacts the flange 22, and the horizontal streak 20 is inserted therethrough.

Further, by using the above-mentioned modified example of the above-described embodiment, when a unit in which the reinforcing steel cage structure 18 and the mold steel 15 are integrally formed is manufactured on site, the following manufacturing is performed. Procedures can be adopted. First, the section steel 15 is placed on the ground so that one of the flanges 22 is in contact with the ground, and a hole for inserting the horizontal streak 20 is formed in the lower edge of the web. Next, the horizontal streak 20 is inserted through the hole, and the inner side of the lower flange 22 is flared with the horizontal streak 20 inserted through the hole. Further, with respect to the horizontal streaks 20, the vertical streaks 19 are arranged and fixed from above. On the other hand, the outer surface 22 of the flange 22 located on the upper side is similar to the above-described embodiment.
The horizontal streak 20 is fixed to a. Further, the vertical bars 19 are fixed from above to form the reinforcing bar cage structure 18.

By adopting such a unit manufacturing procedure, the unit can be manufactured without vertically disposing and lifting the mold steel 15, thereby facilitating the manufacturing operation and improving safety. It is possible.

[0029]

As described above, in the underground continuous wall according to the first aspect, the section steel is disposed between the pair of rebar cage structures disposed opposite to the excavation surface of the underground continuous wall. At the same time, both ends of the steel wall in the width direction of the underground continuous wall are fixed to the reinforcing steel cage structure. As described above, since the reinforcing steel bar and the mold steel are integrated, and the formation of the mold steel relative to the wall thickness becomes relatively large as compared with the conventional underground continuous wall of the SRC structure, the conventional ground Compared with the middle continuous wall, if the wall thickness is the same, the strength of the underground continuous wall can be increased, and if the same external force is assumed, the wall thickness can be reduced. The space inside the structure can be effectively used, and the site can be effectively used. In addition, by reducing the wall thickness, the amount of excavated soil due to excavation is reduced, which can contribute to the reduction of industrial waste.

In the underground continuous wall according to the second aspect, a reinforcing bar cage body composed of a vertical bar and a horizontal bar is formed, and the horizontal bar is fixed to a flange of a section steel made of an H-shaped steel. Not only can such an invention be satisfactorily realized, but also it is possible to accurately assemble a reinforcing steel cage using a shape steel as a ruler, and it is possible to improve the construction accuracy of an underground continuous wall.

In the underground continuous wall according to the third aspect, since the horizontal streak is flared to the flange of the section steel, if the vertical streak is arranged inside the horizontal streak, the invention according to the second aspect is provided. Not only can the structure have a small wall thickness, but also the stress can be smoothly transmitted between the mold steel and the concrete, and the strength can be ensured.

[Brief description of the drawings]

FIG. 1 is a sectional view of an underground continuous wall schematically showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of an underground continuous wall using an RC structure, showing a conventional technique of the present invention.

FIG. 3 is a cross-sectional view of an underground continuous wall using an SRC structure, showing a conventional technique of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Underground continuous wall 12 Ground 13 Concrete 14 Reinforcement structure 15 Type steel 16 Reinforced cage 17 Excavation surface 18 Reinforced cage construction 19 Vertical reinforcement 20 Horizontal reinforcement 22 Flange

Claims (3)

[Claims] 1. An underground continuous wall comprising concrete and a reinforcing structure embedded in the concrete and reinforcing the concrete, wherein the reinforcing structure comprises a reinforcing steel cage and a shape steel, and the reinforcing steel cage Is configured to include one rebar cage component disposed opposite to one excavation surface of the underground continuous wall, and the other rebar cage component disposed opposite to the other excavation surface, Is disposed between the one and the other rebar cage components, and both ends of the underground continuous wall in the wall thickness direction are fixed in contact with the one and the other rebar cage components. Underground diaphragm wall characterized by the following. 2. The underground continuous wall according to claim 1, wherein the rebar cage structure is provided with a plurality of vertical bars arranged to extend vertically and orthogonal to the vertical bars. A plurality of horizontal streaks, the section steel is arranged so as to extend in the vertical direction, the flange is made of an H-section steel in a state parallel to the wall surface of the underground continuous wall, The underground continuous wall, wherein the flange is fixed to the rebar cage structure. 3. The underground continuous wall according to claim 2, wherein the horizontal streak is flared to a flange of the H-shaped steel.