JP2766884B2 - Underground diaphragm wall - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an underground continuous wall, and more particularly to a ground in which concrete constituting a wall is reinforced by a new reinforcing structure instead of a reinforcing bar. It is related to a middle continuous wall.

[Conventional technology]

As is well known, the underground continuous wall constitutes a retaining wall, a water blocking wall, a foundation of a structure, or an underground structure.

 The diaphragm wall is generally constructed by the following method.

First, as shown in FIG. 11, the preceding elements A ₁ , A ₁ ,... Constituting the portion of the continuous wall are formed in the ground G so as to be separated from each other by substantially one element length. These prior element A _1, after applying a wellbore H ₁ for forming the leading element A _1, rebar cage 20 to the wellbore H ₁
Is built and concrete 3 is cast there. Reference numeral 21 denotes a water stoppage plate. Preceding element
A _1, A _1, if ... are construction, to form a wellbore of H ₂ for succeeding elements A ₂ drilled between them leading element A ₁ as shown in FIG. 12. Thereafter, like an anchor rebar cage 20 'in row element for drilling holes H ₂ Thereafter, to form a trailing element A ₂ concrete 3 and Da設, said preceding element A ₁
Wall continuous underground by connecting the trailing element A ₂ and, namely those that form the underground continuous wall.

Therefore, the conventional underground continuous wall is a so-called reinforced concrete structure composed of concrete and reinforcing steel.

[Problems to be solved by the invention]

In recent years, the concept of effectively utilizing the underground due to land shortage and rising land prices has been widespread, and development needs for deep underground spaces and the like have been particularly increasing. As the depth of such underground structures and the like increases, there is a need for an underground continuous wall having an unprecedented depth.

By the way, when the underground continuous wall is to be deepened in this way, the underground continuous wall of the conventional structure has a very large wall thickness, requires enormous construction costs, and requires a construction period. As a result, a problem arises in that valuable use space is reduced accordingly. If the required strength is to be obtained without changing the wall thickness, the ratio of the reinforcing bars of the wall body becomes extremely large, and it becomes difficult to actually exist as a concrete structure.

Further, there is also a problem that a reinforcing bar yard for manufacturing the reinforcing bar cage 20 (20 ') is required, and a large work site is required.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an underground continuous wall that can be constructed at a large depth, with a reduced wall thickness, and at low cost.

[Means for solving the problem]

The invention 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 forms an underground continuous wall. A plurality of H-shaped steels arranged at predetermined intervals along the direction in which the wall body extends, and a steel plate of a predetermined width for connecting both flanges of the H-shaped steels arranged adjacently. Further, joint portions that engage with each other are formed at both ends of the flanges of the H-shaped steel and both ends of the steel plate, and the reinforcing structure is configured such that the H-shaped steel and the steel plate are alternately arranged. A large number of box sections defined by the web of each H-section steel, both flanges, and each steel sheet are connected to each other by the engagement of the joint sections to form a continuous box shape. Inside and outside of the box The H-shaped steel web and the steel plate constituting the reinforcing structure are provided with the box portions and the box portion and the outside thereof. And the openings through which the concrete can circulate when the concrete is poured are formed.

The invention according to claim 2 is also an underground continuous wall composed of concrete and a reinforcing structure embedded in the concrete and reinforcing the concrete,
The reinforcing structure is composed of a plurality of unit bodies each including an H-shaped steel, and a steel plate having a predetermined width and one end edge thereof being entirely welded to at least one end edge of a flange of the H-shaped steel, and Joint portions are formed at both end edges of the H-shaped steel, and the reinforcing structure is formed by connecting the unit bodies by the engagement of the joint portions. A large number of box sections sectioned by each steel plate are formed in a continuous box shape, and the concrete is cast and filled inside and outside of the box section to be embedded in the concrete. The web of the H-section steel and the steel plate constituting the unit body are connected to each other by the box portions and the box portion and the outside thereof, and the con It is characterized in that the opening Ried said concrete upon Da設 can flows are formed respectively.

[Function] The reinforcing structure buried in the concrete and reinforcing the concrete is made of H-shaped steel and a steel plate and has a high rigidity in the form of a box having a large number of boxes, and concrete is provided inside and outside the box. Is filled to form an underground continuous wall, so the rigidity of the entire wall can be greatly improved, and the wall thickness is extremely thin compared to the conventional underground continuous wall made of reinforced concrete. Can be.

In particular, in the underground continuous wall according to claim 1, H
The shape steel and the steel plate can be easily connected in the width direction by the joint portion, so that not only the workability is excellent but also the rigidity between the elements can be secured.

In the underground continuous wall according to the second aspect, the workability is further improved by unitizing the H-shaped steel and the steel plate.

Further, in the underground continuous wall according to claim 1, the H-shaped steel web and the steel plate constituting the reinforcing structure are provided on the underground continuous wall, and in the underground continuous wall according to claim 2, a unit body as the reinforcing structure is provided. Since an opening is formed in the H-section steel web and the steel sheet that constitutes so as to communicate between a large number of box sections that are sectioned and the inside and outside of the box section, they are cast inside and outside the box section. Concrete spreads well through these openings to all sides of the reinforcement structure,
Accordingly, despite the formation of the box portion, the concrete is filled without gaps over the entire underground continuous wall, and the concrete inside and outside the reinforcing structure is reliably integrated.

〔Example〕

 Hereinafter, examples of the present invention will be described.

FIG. 1 is a horizontal sectional view showing a part of the underground continuous wall according to claim 1 of the present invention.

The reference numeral 1 as a whole is an underground continuous wall. The underground continuous wall 1 is constructed in an excavation hole H excavated in the ground G and includes a concrete 3 and a reinforcing structure 4 buried in the concrete 3 and reinforcing the concrete 3. Have been.

 FIG. 2 shows the reinforcing structure 4.

The reinforcing structure 4 includes a plurality of H-section steels 5, 5,... Arranged in parallel at a predetermined interval, and steel plates 10, 10, with a predetermined width provided between flanges 7, 7 of the H-section steels 5. ….

In this case, as shown in FIG. 3, the H-shaped steel 5 is formed with a plurality of openings 8, 8... Penetrating in the thickness direction of the web 6 at predetermined intervals in the longitudinal direction of the H-shaped steel 5. It has become. Further, both end edges 7a of both flanges 7, 7 of the H-section steel 5,
7a has joint portions 9, 9 'formed along both end edges 7a, 7a, respectively.

The joint 9 (9 ') may be formed separately from the flange 7 as shown in FIG. 3, or may be formed by deforming both end edges 7a, 7a of the flange 7 as shown in FIG. Accordingly, the flange may be directly formed on the flange 7.

Here, the H-shaped steel 5 is a so-called rolled H formed by integrally forming the web 6 and the flanges 7,7.
Even if it is a shape steel, the web 6 and the flange formed separately are
A welded H-section steel formed by welding 7 and 7 may be used. In any case, since the thickness of the flanges 7, 7 of the H-section steel 5 is extremely thick, for example, about 50 to 80 mm, the joint portion 9 (9 ') is attached to the edge 7a of the flange 7.
Can be configured.

On the other hand, the steel plate 10 is a flat sheet pile in the present embodiment, and has joints 11, 11 'at both end edges 10a, 10a, like the flanges 7, 7 of the H-section steel 5, respectively. . The joints 11, 11 'formed on the both ends 10a, 10a respectively engage with the joints 9, 9' formed on the both ends 7a, 7a of the flange 7 of the H-section steel 5, respectively. It is configured to be.

Further, in this embodiment, the steel plate 10 has a plurality of openings 12, 12,... Penetrating in the thickness direction of the steel plate 10 at predetermined intervals in the longitudinal direction of the steel plate 10.

The H-shaped steel 5 and the steel plate 10 are engaged with each other by the joint 9 and the joint 11 being engaged with each other.
Further, the joint 9 'and the joint 11' are engaged with each other to be connected to each other, whereby the reinforcing structure 4 is formed.

The reinforcing structure 4 is installed on the wall 2 such that the webs 6, 6, ... of the H-section steels 5, 5, ... are oriented in the thickness direction of the wall 2. Further, the connection of the reinforcing structure 4 in the length direction (depth direction) is not shown, but is performed by welding or a splice plate (side plate) or the like in the same manner as a general connection means of a shape steel. Through bolts and nuts.

The construction of the underground continuous wall 1 having the above structure is performed according to a conventional underground continuous wall construction method.

That is, as shown in FIG. 5, first, the preceding elements A ₁ , A ₁ ,... Constituting the wall 2 are formed in the ground G so as to be separated from each other by approximately one element length. . Formation of the preceding element A ₁ is the preceding element A ₁
After construction of the wellbore H ₁ for forming, the wellbore H ₁
The reinforcing structure 4 is erected therein, and the concrete 3 is cast therein. The reinforcing structure 4 built in one element includes the H-section steel 5 and the steel plate.
Reference numeral 10 denotes a plurality of rows connected alternately in the width direction. Therefore, as shown in FIG. 7, the reinforcing structure 4 connects the H-shaped steel 5 and the steel plate 10 to the joints 9, 11 (9 ', 11').
It builds in the excavation hole H while connecting alternately by. The connection of the H-shaped steel 5 and the steel plate 10 in the longitudinal direction is performed on the ground as shown in FIG. In FIG. 8, the upper end (connection end) of the H-section steel 5 or the steel plate 10 previously inserted into the excavation hole H is near the ground surface by a support device using, for example, a hydraulic jack or the like. And is prevented from dropping.

When the concrete 3 is cast, the opening 8 and the opening 12 are formed in the reinforcing structure 4 in the embodiment as described above.
Can sufficiently spread to the four sides of the reinforcing structure 4. Therefore, the filling property of the cast concrete 3 can be improved, and at the same time, the bonding force between the concretes cast inside and outside the reinforcing structure 4 is increased, and the wall 2 is made stronger.

When the preceding elements A ₁ , A ₁ ,... Have been built, excavation is made between the preceding elements A ₁ to form a drilling hole for the succeeding element as shown in FIG. The reinforcing structure 4 is erected in the hole. The reinforcing structure 4 for the preceding element and the reinforcing structure 4 for the preceding element are connected via the joints 9, 11 (9 ', 11').

Thus, the reinforcing structure 4 prior element A ₁ and the reinforcement structure 4 of the trailing element A ₂ is joint 9,11
(9 ', 11') can be easily connected to each other, and thereby both reinforcing structures 4 are structurally connected and integrated.

Then Da設concrete 3 in a row downhole for elements after the reinforcing structure 4 as described above is Tatekoma to form a trailing element A _2, and a trailing element A ₂ and the preceding element A ₁ By connecting, a wall body 2 as shown in FIG. 6, that is, an underground continuous wall 1 is formed.

Since the underground continuous wall 1 is composed of the concrete 3 and the reinforcing structure 4 composed of the H-section steel 5 and the steel plate 10, the rigidity of the wall 2 can be greatly improved, and the conventional underground continuous The wall thickness can be made extremely thin as compared with the wall. Therefore, the construction cost can be reduced by greatly reducing the amount of the concrete 3 used, and the space constituted by the underground continuous wall 1 can be efficiently used. Further, the reinforcing structure 4 is connected to the joints 9 and 11 (9 ′, 1).
1 ') makes it possible to easily connect in the width direction, so that efficient work can be expected, and furthermore, the integration of the respective elements can be achieved, so that the wall 2 can be made even more rigid. Further, since there is no need to install a reinforcing bar yard on the ground for producing or stocking a large reinforcing bar cage, the reinforcing bar yard does not occupy the ground surface, and the ground surface can be effectively used.

Further, in the embodiment, since a standard flat sheet pile is used as the steel sheet 10, the reinforcing structure 4 can be manufactured at a lower cost.

Next, FIG. 9 shows a reinforcing structure 4 according to a second embodiment of the present invention.

The reinforcing structure 4 according to the present embodiment is composed of an H-shaped steel 5 and a steel plate 10 as in the first embodiment, but in this case, the H-shaped steel 5 and the steel plate 10 are used. Form an integrated unit body 15 in advance, and a plurality of these unit bodies 15, 15,... Are connected to form an outer reinforcing structure 4.

That is, at least one edge of the flange 7 of the H-section steel 5
One unit body 15 is formed by completely welding one edge 10a of the steel plate 10 having a predetermined width to 7a. A joint portion 9 is provided at the other end 7a 'of the H-shaped steel member 5 to which the steel plate 10 is not connected.
A joint portion 11 is formed at 10a '. That is,
These two joint portions 9 and 11 constitute a joint portion at both end edges of the unit body 15. The point that openings 8 and 12 are formed in the web 6 and the steel plate 10 of the H-section steel 5, respectively, is the same as that of the previous embodiment.

The underground continuous wall 1 constructed by using the reinforcing structure 4 having the above configuration can also obtain the same operation as the underground continuous wall 1 of the previous embodiment. Since the steel plate 10 was previously integrated and formed into a unit, the reinforcing structure 4
The construction work on site can be performed more efficiently.

Further, the H-shaped steel 5 and the steel plate 10
Since all the connections are made by welding, the connection work of both of them, that is, the welding work, can be performed extremely easily.
Therefore, even when this connection work is automatically welded by a welding device, the work can be performed extremely easily, and the unit body 15 can be manufactured at low cost.

Next, FIG. 10 shows a reinforcing structure 4 according to a third embodiment of the present invention.

The reinforcement structure according to the present embodiment is configured by connecting unit bodies 15 previously integrated with an H-section steel plate 5 and a steel plate 10 as in the second embodiment described above. The body 15 is composed of one H-shaped steel 5 and steel plates 10 and 16 whose one ends are fully welded to both ends 7a and 7a 'of the flange 7 of the H-shaped steel 5, respectively. Joints 11, 17 are formed on the edges 10a ', 16a' of the steel plates 10, 16 on the side where the H-beam 5 is not connected. That is, these two joint portions 11, 17 constitute a joint portion at both end edges of the unit body 15. In this case, openings 8 and 12 are formed in the web 6 of the H-section steel 5 and one of the steel plates 10, respectively.

The reinforcing structure 4 according to the present invention is a unit body having the above configuration.
15, 15,... In the case of this embodiment, the same operation as in the above two embodiments can be exhibited.

By the way, in the present embodiment, the steel sheet 10 is configured to use a standard flat sheet pile. Therefore, if a standard product is also used for the H-section steel 5, the width of the unit body 15 alone is limited in the configuration of the second embodiment described above. Therefore, if the configuration of the unit body 15 is as shown in the third embodiment, the other steel plate 16
Is freely selected, the width of one unit body 15 can be arbitrarily selected.

Needless to say, the joints 9 (9 ', 1
The structure of (1, 11 ', 17) is not limited to the illustrated example, and other structures may of course be used.

In the above embodiment, each element A ₁ (A ₂ )
The reinforcing structures 4 installed in correspondence with the above are joined together by joints.
The ends of the reinforced concrete cage are not necessarily connected.
As in (20 '), the ends may be simply wrapped. In this case, the integration of the reinforcing structures 4 between the elements is inferior to that of the above embodiment, but the installation work is extremely easy.

〔The invention's effect〕

As described above, according to the underground continuous wall according to claim 1 of the present invention, the reinforcing structure of the underground continuous wall composed of concrete and the reinforcing structure is formed by a large number of H-shaped steel sheets and steel plates. It is constructed as a box-shaped high-rigid thing with a box part, and concrete is poured and filled inside and outside the box part to form an underground continuous wall, so that the rigidity of the wall body is greatly improved. The wall pressure can be made extremely thin as compared with the conventional underground continuous wall. Therefore, the amount of concrete used can be greatly reduced, the construction cost can be reduced, and the space constituted by the underground continuous wall can be efficiently used. In addition, since joint portions are formed at both ends of the H-shaped steel and the steel plate, the H-shaped steel and the steel plate can be easily connected in the width direction, and efficient work can be expected. The rigidity of the wall body can be further enhanced by firmly integrating the elements constituting the intermediate continuous wall. Furthermore, since there is no need to install a reinforcing bar yard on the ground for producing a large reinforcing bar cage, the ground surface can be effectively used.

According to the underground continuous wall according to the second aspect, in addition to obtaining the same effect as the underground continuous wall according to the first aspect, the H-section steel and the steel plate are previously integrated into a unit. Therefore, the work of building the reinforcing structure on site can be performed more efficiently.

In addition, since the connection between the H-section steel and the steel plate forming the unit body is entirely welded, the connection work by welding both can be extremely easily performed by automatic welding, and the unit body can be manufactured at low cost. It has the effect that it can be done.

Further, in the underground continuous wall according to claim 1, the H-shaped steel web and the steel plate constituting the reinforcing structure are provided on the underground continuous wall, and in the underground continuous wall according to claim 2, a unit body as the reinforcing structure is provided. Since an opening is formed in the H-section steel web and the steel sheet that constitutes so as to communicate between a large number of box sections that are sectioned and the inside and outside of the box section, they are cast inside and outside the box section. Concrete spreads well through these openings to all sides of the reinforcement structure,
Therefore, the concrete is filled without gaps throughout the underground continuous wall, and concrete inside and outside the reinforcing structure is surely integrated. For this reason, there is no concern that the concrete constituting the underground continuous wall is divided by the reinforcing structure and the strength is impaired despite the formation of the box portion in the reinforcing structure. The rigidity as a continuous wall can be sufficiently secured.

[Brief description of the drawings]

FIG. 1 is a partial horizontal sectional view showing an underground continuous wall according to a first embodiment of the present invention, FIG. 2 is a perspective view showing a part of a reinforcing structure according to this embodiment, and FIG. FIG. 4 is a partial perspective view showing an H-beam, FIG. 4 is a plan view showing a part of the H-beam, FIG.
5 to 6 illustrate a method of constructing an underground continuous wall according to the present embodiment. FIGS. 5 and 6 are horizontal sectional views showing a part of a wall body, and FIGS. FIG. 9 is a partial perspective view showing a reinforcing structure according to a second embodiment of the present invention, and FIG. 10 is a partial perspective view showing a reinforcing structure according to a third embodiment of the present invention. 11 and 12 are partial horizontal sectional views showing an example of a conventional underground continuous wall. 1 ... Underground continuous wall, 2 ... Wall, 3 ... Concrete, 4 ... Reinforcement structure, 5 ... H-shaped steel, 6 ... Web, 7 ... Flange, 7a, 7a '... End Edge, 8 opening, 9, 9 'joint part, 10 steel plate, 10a, 10a' edge, 11, 11 'joint part, 12 opening, 15 unit body, 15a, 15a ': Edge, 16: Steel plate, 16a: Edge, 17: Joint.

Claims (2)

(57) [Claims] 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 wall forming an underground continuous wall A plurality of H-shaped steels arranged at predetermined intervals along the direction of extension of the H-shaped steel, and a steel plate of a predetermined width connecting both flanges of the H-shaped steels arranged adjacent to each other, and Joint portions are formed at both ends of the flange of the H-shaped steel and at both ends of the steel plate, and the reinforcing structure is such that the H-shaped steel and the steel plate are alternately arranged and the joint portion is formed. A plurality of box sections defined by the web of each H-section steel, both flanges and each steel sheet by being connected by the engagement of each other, are formed in a continuous box shape. Inside and outside the concrete The H-shaped steel web and the steel sheet constituting the reinforcing structure are provided with the box portions and the box portion and the box portion. An underground continuous wall, wherein openings through which the concrete can flow when the concrete is placed in communication with the outside are formed. 2. An underground continuous wall composed of concrete and a reinforcing structure embedded in the concrete and reinforcing the concrete, wherein the reinforcing structure comprises an H-shaped steel, and the H-shaped steel. A plurality of unit bodies each including at least one end edge of the flange and a steel plate having a predetermined width and one end edge thereof being entirely welded, and joint portions that engage with each other are formed at both end edges of the unit body. In the reinforcing structure, a large number of box sections defined by the web of each H-section steel, the two flanges, and the steel sheets are connected by connecting the unit bodies by the engagement of the joint sections. The concrete is formed into a box shape, and is buried in the concrete by casting and filling the concrete inside and outside the box portion. An opening through which the concrete can flow when the concrete is poured into the web of the H-shaped steel and the steel plate constituting the body by connecting the box portions with each other and the box portion and the outside thereof and pouring the concrete. Wherein an underground continuous wall is formed.