JPH05331841A - Construction method for underground continuous wall - Google Patents

Abstract

PURPOSE:To prevent leakage of water to an excavation side, that is, to the inner room side of an underground structure and to add excellent waterstop performance to an underground continuous wall, by making as a waterstop plate, the other side flange 4 of a reinforcing steel material 1 provided with no opening part 5. CONSTITUTION:A web 2 and a pair of flange 3 and 4 installed so as to be parallel to each other on both side edge parts of the web 2 are provided. A reinforcing steel material 1 comprising the web 2 and one side flange 3 provided with opening parts 5 is prepared and the other flange 4 provided with no opening part is arranged on an excavation side to be erected into a channel.

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 construction method for reinforcing concrete constituting a wall body with a reinforcing steel material.

[0002]

2. Description of the Prior Art Generally, underground continuous walls of underground structures are
What is called a waterproof still or a waterproof sidewall, or a steel continuous underground wall in which a reinforcing steel material is used and concrete or the like is placed as the filling material is used.

[0003]

Strictly speaking, the above-mentioned water-stopping mountain stay or water-stopping side wall is strictly concrete cast in muddy water, and there is a problem that water leakage through cracks is inevitable. .. Further, the steel underground continuous wall described above has a higher water-tightness than the reinforced concrete connecting wall, but due to the construction of the filling material such as concrete or mortar that is placed inside the reinforcing steel material, the reinforcing steel material is partially Since a typical opening is provided, there is still a possibility of water leakage from this opening, making it difficult to form a completely continuous underground wall.

Therefore, an object of the present invention is to provide a underground continuous wall construction method capable of eliminating the possibility of water leakage and imparting good water stopping performance to the underground continuous wall.

[0005]

In order to achieve the above object, the underground continuous wall construction method of the present invention comprises a web and a pair of flanges provided on both side edge portions of the web so as to be parallel to each other. Prepare a reinforcing steel material having an opening in the web and one of the pair of flanges, dig a groove in the ground, and outside the other flange without the opening of the reinforcing steel material. With the packing material attached above the surface with floor surface, the other flange is arranged on the excavation side and a plurality of the reinforcing steel materials are continuously installed in the groove and built in, and the floor surface position of the groove Placing concrete up to the floor surface position of the groove, placing concrete on the ground side of the reinforcing steel and on the inside of the reinforcing steel and mortar around the packing material on the excavating side of the reinforcing steel. Inject and drill There, fitted with a dowel on the other flange, and characterized in that pouring a post-deposited concrete flange side of the other.

[0006]

According to the underground continuous wall construction method of the present invention, the other flange without the opening of the reinforcing steel material is arranged on the excavating side, and a plurality of the reinforcing steel materials are continuously installed in the groove and built. Therefore, the other flange of the reinforcing steel material serves as a water stop plate to prevent water leakage to the excavation side.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An underground continuous wall construction method according to an embodiment of the present invention will be described below with reference to the drawings. 2, FIG. 3, FIG. 4, FIG. 7 and FIG. 8, the right side is the excavation side that forms the inner chamber of the underground structure, and the left side is the outer side that is not excavated.

First, the reinforcing steel material 1 used in the underground continuous wall construction method of this embodiment will be described. This reinforcing steel material 1 is
As shown in FIG. 1, a rectangular web 2 and a pair of rectangular flanges 3 and 4 respectively provided on both side edges of the web 2 in the longitudinal direction so as to be parallel to each other.
The web 2 and one flange 3 of the pair of flanges 3 and 4 are provided with a plurality of openings 5 penetrating in the thickness direction (on the other flange 4). Is not provided with an opening). In addition, joint portions 6 are provided on both end edges of the flanges 3 and 4.
4 is provided along the longitudinal direction. As shown in FIG. 1, a plate-shaped portion 6a having a predetermined width is formed on one of the reinforcing steel materials 1 disposed at adjacent positions so as to be orthogonal to the flanges 3 and 4, and the other of the joint portions 6 is formed on the other side. The reinforcing steel material 1 is also formed with an arcuate portion 6b into which the plate portion 6a is fitted (see FIG. 4 and the like). The shape of the joint portion 6 is not limited to the above, and various known shapes can be applied (for example, a straight sheet pile type in which joint portions having substantially arc shapes are fitted to each other). Then, for example, the reinforcing steel material 1 having the plate-shaped portion 6a is built in, and then the reinforcing steel material 1 having the arcuate portion 6b is installed inside the arcuate portion 6b, and the plate-shaped portion of the reinforcing steel material 1 in the built-in state. 6a
Position and assemble them while fitting them, and repeat this as necessary. In addition, on the inner surface of the other flange 4 of the reinforcing steel material 1 facing the one flange 3,
A plurality of reinforcing dowels 7 are attached in advance (see FIG. 4).

Next, the underground continuous wall construction method of this embodiment using the reinforcing steel material 1 will be described step by step.

First, as shown in FIG. 2, a groove 9 having a predetermined depth is dug at a predetermined position of the ground 8. Here, the width of this groove 9 is
It is set to be larger than the distance between the flanges 3 and 4 of the reinforcing steel material 1 by a predetermined amount, and is set to be approximately equal to the thickness of the underground continuous wall to be manufactured.

On the other hand, the reinforcing steel material 1 is located on the outer surface of the other flange 4 not provided with the opening, above the position F, which is the flooring surface when the reinforcing steel material 1 is installed in the groove 9. A packing material 11 having a predetermined thickness is attached to.
As the packing material 11, a lightweight precast concrete board or expanded polystyrene is adopted. The packing material 11 is provided to temporarily prevent concrete 12 to be described later from entering between the groove 9 and a portion of the other flange 4 of the reinforcing steel material 1 above the floor attachment surface position F. is there.

Then, with the other flange 4 arranged on the excavation side, a plurality of the reinforcing steel materials 1 are continuously installed while fitting the joint portions 6 and built in the groove 9.

Next, concrete 12 is poured up to the floor-attached surface position F of the groove 9. That is, at the floor-side surface position F of the reinforcing steel material 1, the ground side, the inside of the reinforcing steel material 1 (the space portion surrounded by the respective flanges 3 and 4 of the adjacent reinforcing steel material 1 and the web 2) and the excavation side concrete. Place 12

Then, concrete 12 is cast up to the surface position of the ground 8 on the ground side of the reinforcing steel material 1 and on the inside of the reinforcing steel material 1 above the position F of the groove 9 on the floor. (End of Figure 2
On the other hand, mortar is injected around the packing material 11 on the digging side of the reinforcing steel material 1. The mortar and the packing material 11 are provided after the excavation so as to facilitate the removal of the post-cast concrete (sidewall, concrete to be the decorative wall) for placing.

Next, as shown in FIG. 3, excavation is performed up to the floor-attached surface position F on the excavation side of the ground 8.

Then, the mortar and the packing material 11 placed on the outer side (excavation side) of the flange 4 are suspended according to excavation. After removing the mortar and the packing material 11, a plurality of reinforcing dowels 13 are attached to the outer surface of the other flange 4 on the excavation side (see FIG. 4).

Next, a post-cast concrete 14 is placed on the outer surface side of the other flange 4 to finish the underground wall 15 (the above is the state shown in FIGS. 3 and 4).

According to the underground continuous wall construction method of the present embodiment described above, the other flange 4 of the reinforcing steel material 1 not provided with the opening is arranged on the excavating side, and the reinforcing steel material 1 is cut into the groove 9. Since it will be built by arranging more than one in a row,
The other flange 4 serves as a water stop plate to prevent water leakage to the excavation side, that is, the inner room side of the underground structure. Therefore, good water shutoff can be imparted to the underground wall 15.

Then, in this embodiment, the following constitution is adopted in order to further improve the water stopping property of the underground continuous wall 15.

Joint 6 between adjacent reinforcing steel members 1
5, the outer surface of the flange 4 on the digging side of the reinforcing steel material 1 on one side (the side on which the plate-shaped portion 6a of the joint portion 6 is provided) and the other reinforcing steel material 1 on the other side, as shown in FIG.
A water stop plate 16 made of an iron plate extending in the longitudinal direction is provided between the outer surface of the arc-shaped portion 6b and the outer surface thereof to prevent a gap therebetween.
The water stop plate 16 is two-side welded to the outer surface of the flange 4 and the outer surface of the arcuate portion 6b. Then, when there is a high possibility that water will flow out, the attachment plate 17 that closes the gap is provided.
Is provided to guide water downward.

A joint for joining the reinforcing steel material 1 in the depth direction is called a field joint, and this field joint includes a bolt joint and a weld joint. Then, the splicing plate 18a and the bolt 18b
In the case of adopting a bolt joint composed of and, in order to prevent water leakage from the bolt hole, the reinforcing steel materials 1 are made of steel in a state of being fixed by the splicing plates 18a and the bolts 18b as shown in FIG. The lid 18 is covered so as to cover these outsides, and the periphery of the lid 18 is welded to both the reinforcing steel materials 1 without any gap. Also, the joints between the reinforcing steel materials 1 are welded together without any gaps.

Further, as shown in FIG. 7, crushed stone 19a is laid on the surface with the floor after excavation, and then leveled concrete 19
In order to improve the water blocking performance of the joint between the bottom plate 21 and the underground continuous wall 15 in which the bottom plate concrete 20 is poured, and the bottom plate concrete 20 is placed in the center of the bottom plate concrete 20 in the thickness direction. At the position, the rear bottom concrete 20 is provided by welding the steel water stop plate 22 to the flange 4 so as to horizontally extend outward from the digging side flange 4 of the reinforcing steel material 1 of the underground continuous wall 15. As shown in FIG. 8, the crushed stone 19a is laid, and the leveling concrete 19 is laid, and then the plate member 23 made of an iron plate is laid.
A water stop plate 24 made of a corrugated type iron plate is provided so as to cover the joint between the excavation side flange 4 of the reinforcing steel material 1 and the excavation side flange 4, and both ends of the water stop plate 24 are respectively connected to the plate member 23 and the excavation side. It is possible to adopt a method of placing the bottom plate concrete 20 after welding it to the flange 4 of the above. The reason why the corrugated iron plate is adopted as the water blocking plate 24 is that the water blocking plate 24 is deformed following the deformation of the underground continuous wall 15 and the bottom plate 21.

Further, as shown in FIG. 9, in order to improve the water blocking performance of the corner portion of the underground wall 15, as shown in FIG.
In the reinforced steel material 1 constituting 5 of FIG. 5, a water stop plate 26 made of a corrugated type iron plate (adopted for the same reason as above) is provided on the excavation side between the adjacent reinforcement steel materials 1, and both ends of the water stop plate 26 are provided. For example, a method of welding both reinforcing steel materials 1 to the flange 4 on the excavation side can be adopted.

[0024]

As described in detail above, according to the underground continuous wall construction method of the present invention, the other flange, which is not provided with the opening of the reinforcing steel material, is arranged on the digging side, and the reinforcing steel material is Since a plurality of them are continuously installed in the groove and built in, the other flange of the reinforcing steel material serves as a water stop plate and prevents water leakage to the excavation side, that is, the inner room side of the underground structure. Therefore, it is possible to impart good water blocking performance to the underground continuous wall.

[Brief description of drawings]

FIG. 1 is a perspective view showing a reinforcing steel material used in an underground continuous wall construction method according to an embodiment of the present invention.

FIG. 2 is a schematic view of a concrete continuous wall construction method according to an embodiment of the present invention in which concrete is placed up to a predetermined position on the ground side of the reinforcing steel material and the inside of the reinforcing steel material above the position of the floor surface of the groove. FIG.

FIG. 3 is a vertical cross-sectional view schematically showing a state where the underground continuous wall is finished in the underground continuous wall construction method according to the embodiment of the present invention.

FIG. 4 is a transverse cross-sectional view schematically showing a state where the underground continuous wall is finished in the underground continuous wall construction method according to an embodiment of the present invention.

FIG. 5 is a plan view showing a structure for improving the water blocking performance of a joint portion in an underground continuous wall construction method according to an embodiment of the present invention.

FIG. 6 is a perspective view showing a structure for improving water blocking when connecting reinforcing steel materials in a depth direction in an underground continuous wall construction method according to an embodiment of the present invention.

FIG. 7 is a vertical cross-sectional view showing an example of a structure for improving the water blocking performance of the joint portion between the underground continuous wall and the bottom plate in the underground continuous wall construction method according to the embodiment of the present invention.

FIG. 8 is a vertical cross-sectional view showing another example of the structure for improving the water blocking performance of the joint portion between the underground continuous wall and the bottom plate in the underground continuous wall method according to the embodiment of the present invention.

FIG. 9 is a plan view schematically showing a configuration for improving water blocking performance at a corner portion of the underground continuous wall construction method according to the embodiment of the present invention.

[Explanation of symbols]

 1 Reinforced Steel Material 2 Web 3 One Flange 4 The Other Flange 5 Opening 8 Ground 9 Groove 11 Packing Material 12 Concrete 13 Gibel 14 Post-cast Concrete F Floor Position

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Koichi Mae 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Takanori Hirai 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Shinichi Tanaka 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation Co., Ltd. (72) Inventor Shigeo Kawahara 20-1 Shintomi, Futtsu City, Chiba Nippon Steel Co., Ltd. In RE (72) Inventor Hiroshi Furube 2-5-8 Kita-Aoyama, Minato-ku, Tokyo Intra-company group

Claims (1)

[Claims] 1. A web comprising: a web; and a pair of flanges respectively provided on both side edge portions of the web so as to be parallel to each other. An opening is provided in the web and one of the pair of flanges. Prepare a reinforcing steel material, dig a groove in the ground, and attach the packing material above the floor-attached surface position on the outer surface of the other flange where the opening of the reinforcing steel material is not provided. Placed on the excavation side and building a plurality of the reinforcing steel materials continuously in the groove, placing concrete up to the floor surface position of the groove, and the ground of the reinforcing steel material at the floor surface position of the groove or more. Concrete is cast on the mountain side and on the inside of the reinforcing steel, and mortar is injected around the packing material on the excavating side of the reinforcing steel, excavation is performed, a dowel is attached to the other flange, and the other flange Underground continuous wall method, characterized by pouring the post-deposited concrete.