JPH03180613A - Underground continuous wall - Google Patents

Abstract

PURPOSE:To increase the rigidity of a continuous wall body and facilitate construction work by forming a reinforcement body of the concrete wall of a cell-type structural body consisting of H-section steel having engagement parts at flanged end parts connected with each other by steel plates having engagement parts. CONSTITUTION:H-section steel 5 having joint parts, 9, 9' at flanged end parts is installed at a predetermined interval in a dug groove, and the flanged parts of the H-section steel 5 are connected with each other by steel plates 10 having joint parts 11, 11' at both ends, so a cell-type structural body 4 is formed. Concrete 3 is then placed to complete an underground continuous wall 1. A wall body having a good rigidity can thus be constructed with a good efficiency.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an underground continuous wall, and in particular, to a wall in which the concrete constituting the wall is reinforced with a new and exciting structure in place of a reinforcing bar cage. This relates to medium continuous walls.

[Conventional technology]

As mentioned earlier, underground continuous walls constitute earth retaining walls, water-stop walls, foundations of structures, and underground structures.

A diaphragm wall is generally constructed by the following method.

First, as shown in FIG. 11, in the ground G, there are preceding elements A I , A I , . . . that constitute the continuous wall part.
are formed so as to be separated from each other by approximately the length of one element. These preceding elements A1 are constructed by constructing an excavated hole H1 for forming this preceding element AI, then building a reinforcing bar cage 20 in the excavated hole H3, and pouring concrete 3 therein. code 21
is a water stop plate. Preceding elements A + , A 1・
. . , is constructed, excavate between the preceding elements A3 to form excavated holes H3 for the succeeding elements A, as shown in FIG. After that, a reinforcing bar cage 20' is inserted into the excavated hole H for the trailing element, concrete 3 is poured to form the trailing element A, and the preceding element A and the trailing element A are By connecting these, a wall that is continuous underground, that is, an underground continuous wall, is formed.

Therefore, conventional underground continuous walls have been constructed of so-called reinforced concrete, consisting of concrete and reinforcing steel bars.

[Problem to be solved by the invention]

In recent years, due to land shortages and soaring land prices, ideas for making effective use of underground space have become widespread, and the need for development of deep underground space is particularly increasing. As underground structures and the like become deeper, there is a need for underground continuous walls that are deeper than ever before.

By the way, when creating a deep underground continuous wall in this way, the wall thickness of a conventional underground continuous wall becomes extremely thick, resulting in an enormous construction cost and a long construction period. As the size increases, the problem arises that valuable usable space is reduced accordingly. If an attempt was made to obtain the required strength without changing the wall thickness, the ratio of reinforcing bars in the wall would become extremely large, making it difficult to actually exist as a concrete structure.

Furthermore, a reinforcing bar yard for manufacturing the reinforcing bar cage 20 (20') is also required, which poses the problem of requiring a large work site.

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 great depth and with a small wall thickness, and can be constructed at low cost.

[Means to solve the problem]

The invention according to claim 1 provides an underground continuous wall composed of concrete and a reinforcing structure buried in the concrete and reinforcing the concrete, in which the reinforcing structure is inserted along the extending direction of the wall. Consisting of a plurality of H-beams arranged at predetermined intervals, and a steel plate of a predetermined width provided between the flanges of these H-beams, and on both ends of the flange of these H-beams and on both ends of the steel plate, It is characterized by forming shield parts that engage with each other.

Further, the invention according to claim 2 also provides an underground continuous wall composed of concrete and a reinforcing structure buried in the concrete and reinforcing the concrete, in which the reinforcing structure is made of H-beam steel, A steel of a predetermined width whose one end edge is completely welded to at least one end edge of the flange of the H-shaped steel! i
The device is characterized in that it is composed of a plurality of unit bodies that are connected to each other, and that joints that engage with each other are formed on both ends of the unit bodies.

[Effect]

Since the reinforcing structure that is buried in the concrete and reinforces the concrete is mainly composed of H-beam steel, which is a highly rigid body, the rigidity of the entire wall can be greatly improved, making it possible to improve the structure of reinforced concrete. The wall thickness can be made extremely thin compared to conventional underground continuous walls.

In addition, in particular, in the underground continuous wall according to claim 1, the H-beam steel and the JIII plate can be easily connected in the width direction by the joint part, which not only provides excellent workability but also ensures rigidity between the elements. I can do that.

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

〔Example〕

Examples of the present invention will be described below.

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

What is indicated by the reference numeral 1 as a whole is an underground continuous wall. This underground continuous wall 1 is constructed in an excavated hole H excavated in the ground G, and is composed of concrete 3 and a reinforcing structure 4 buried in this concrete 3 and reinforcing the concrete 3. has been done.

FIG. 2 shows the reinforcing structure 4.

The reinforcing structure 4 includes a plurality of large Hs arranged in parallel at predetermined intervals.
shape [5, 5,... and the flange 7 of those H-beams 5
．． A steel plate of a predetermined width 10°10,...
It is composed of.

In this case, the H-shaped w45 has openings 8.8.・
... are formed at predetermined intervals in the longitudinal direction of the H-shaped R5. Also, both flanges 7 of H type W45.
Both end edges 7a, 7a of 7 have their both end edges 7a, 7
A diagonal section 9.9' is formed along the section a.

This joint portion 9 (9') may be formed separately from the flange 7 as shown in FIG.
It may be formed directly on this flange 7 by deforming a.

Here, the H-shaped steel 5 is a so-called rolled H-shaped steel in which the web 6 and the flange 7.7 are integrally formed.
It may be a section steel or a welded H-section steel constructed by welding a web 6 and a flange 7.7 which are constructed separately. In any case, the H type jl! Since the thickness of the flange 7.7 of the flange 15 is extremely thick, for example, about 50 to 80 mm, it is possible to form the self-indented portion 9 (9') on the end edge 7a of the flange 7.

On the other hand, the steel plate IO is a flat sheet pile in this embodiment, and joint portions tt and tt' are formed on both end edges 10a and 10a, respectively, similarly to the flange 7.7 of the H-shaped u5. And these both end edges 10a, 1
The joint portions z and tt' formed at the front 32
The joints 9 and 9' formed in a are configured to engage with each other.

Furthermore, in this embodiment, the political platform @10 is
A plurality of openings 12, 12 penetrating through the steel plate 10 in the thickness direction are formed at predetermined intervals in the longitudinal direction of the steel plate 10.

Then, when the H-shaped R5 and the steel plate 10 engage with the joint part 9 and the joint part 2,
Further, the joint portion 9' and the joint portion 11' are connected by engaging with each other, thereby forming the reinforcing structure 4.

This reinforcing structure 4 is formed in the H-shaped 1 in the wall 2.
N5,5. ...'s web 6.6. ... are installed so as to face the thickness direction of the wall body 2. Although not shown in the drawings, the reinforcing structure 4 can be connected in the length direction (depth direction) by welding, splice plates, etc., as is the case with general connection means for shaped steel. This is done with bolts, nuts, etc.

The underground continuous wall 1 having the above structure is constructed in accordance with a conventional underground continuous wall construction method.

That is, as shown in Fig. 5, first in the ground G...
are formed so as to be separated from each other by approximately the length of one element. The formation of the preceding element A is carried out by constructing an excavated hole H2 for forming the preceding element A1, then building the reinforcing structure 4 into the excavated hole H, and pouring concrete 3 there. Constructed by 1
The reinforcing structure 4 built into two elements is
A plurality of shaped portions 5 and steel plates 10 are connected alternately in a plurality of rows in the width direction. Therefore, as shown in FIG. 7, the reinforcing structure 4 is constructed in the excavated hole H by alternately connecting the H-section steel 5 and the steel plate 1O by the joint parts 9, 11 (9', 11'). It gets crowded.

Further, the connection in the longitudinal direction of the H-shaped steel 5 and the steel plate IO is performed above ground as shown in FIG. In addition,
In FIG. 8, the H-shaped steel 5 or steel plate 1O that was previously inserted into the excavated hole H is moved to a position where its upper end (connection end) is near the ground surface by a support device using, for example, a hydraulic jack. to prevent it from falling.

Since the reinforcing structure 4 is formed with the openings 8 and 12 as described above, the poured concrete 3 is poured into the openings 8 and 12. ! 2 can be sufficiently distributed on all sides of the reinforcing structure 4. Therefore, the filling properties of the poured concrete 3 can be improved, and the bonding force between the concrete placed inside and outside of the reinforcing structure 4 is increased, thereby making the wall body 2 stronger.

Once the preceding elements A I, A + , . . . are constructed, the preceding elements A as shown in FIG.
1 to form an excavated hole for the trailing element, and the reinforcing structure 4 is built into this excavated hole for the trailing element.

At this time, the reinforcing structure 4t for the trailing element and the reinforcing structure 4 for the preceding element are connected via the joint portions 9, 11 (9', 1).

In this way, the reinforcing structure 4 of the leading element A and the reinforcing structure 4 of the trailing element At are connected to the joint portions 9 and 1.
1 (9', 11'), and thereby both of these reinforcing structures 4 are structurally connected and integrated.

After that, concrete 3 is placed in the excavated hole for the trailing element in which the reinforcing structure 4 has been built as described above to form the trailing element A, and the preceding element A and the trailing element A are connected. By connecting them, a wall body 2 as shown in FIG. 6, that is, an underground continuous wall l is formed.

The underground continuous wall! Since it is composed of concrete 3 and a reinforcing structure 4 made of H-shaped 115 and W4 temporary 10, the rigidity of the wall 2 can be greatly improved, and the wall thickness can be reduced compared to conventional underground continuous walls. can be made extremely thin. Therefore, it is possible to significantly reduce the amount of concrete 3 used and reduce construction costs, and
The space excavated by the underground continuous wall l can be used efficiently.

Further, the reinforcing structure 4 has a joint portion 9. It(911'
) allows for easy connection in the width direction, resulting in efficient work, and furthermore, by integrating each element, the wall body 2 can be made even more rigid. Furthermore, since there is no need to install a reinforcing bar yard on the ground for producing or stocking large reinforcing bar cages, the reinforcing bar yard does not occupy the ground surface, and the ground surface can be effectively illuminated.

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

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

The reinforcing structure 4 according to this embodiment is composed of an H-shaped steel 5 and a steel plate 10, as in the first embodiment. 10
form a unit body 15 that is integrated in advance, and the reinforcing structure 4 is formed by connecting a large number of these unit bodies 15, 15°, . . . .

That is, at least one end R of the flange 7 of the H shape w45
7a, one end edge 10a of a predetermined width fi10 is completely welded to form one unit body t5. And the H shape! ! A joint portion 9 is provided on the other edge 7a to which the steel plate IO is not connected in 15, and a joint portion 11 is provided on the other edge 10a' of the R slope 10.
is formed.

That is, these two joint portions 9 and 11 constitute joint portions at both ends of the unit body 15. H-shaped! This is similar to the previous embodiment in that openings 8, 12 are formed in each of the web 6 and the steel plate 10 of 95.

The underground continuous wall l constructed using the reinforced structure 4 having the above configuration can also obtain the same effect as the underground continuous wall l of the previous example, but in this example, the H-shaped jl 15 and the steel plate 10
Since the reinforcing structure 4 is integrated in advance and formed into a unit, the on-site erection work of the reinforcing structure 4 can be carried out more efficiently.

Further, since the H-type w45 and atto, which have +RFa on the unit body 15, are all connected by welding, the connection work, that is, the welding work, for both of them can be performed extremely easily. Therefore, even when automatic welding is performed using this joint welding machine, 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 reinforcing structure 4 according to this embodiment is constructed by connecting unit bodies 15 that are previously integrated with H-beams 5 and steel plates 1O, as in the second embodiment, but it is made up of a single unit. The body 15 includes one 14-shaped w45 and the H-shaped w
45, one end edge of each is completely welded to both end edges 7a and 7a' of the flange 7. And edges 10a', 16a' of these steel plates to, 16 on the side to which the H-beam 5 is not connected.
A shield portion 11.17 is formed in each of the holes. That is, these two joint portions 11 and 17 constitute the joint portions of both ends of the unit body 15. Further, 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.

A reinforcing structure 4 according to the present invention includes a unit body 1 having the above structure.
5,15. It may be configured by... In the case of this embodiment as well, the same effect as in the above two embodiments can be achieved.

By the way, in this embodiment, a flat sheet pile, which is a standard product, is used as the steel plate IO. Therefore, if a standard product is used for the H-beam 5, the width of the unit 15 alone will be 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 I
By freely selecting the width of the temporary 16, the width of one unit body 15 can be set arbitrarily.

It goes without saying that each of the tied portions 9 (9', 9',
The structures of 11.11' and 17) are not limited to the illustrated example, and may of course be of other configurations.

In addition, in the above embodiment, each Niremen 1AI (A!
The reinforcing structures 4 installed corresponding to the "+" were connected to each other by joints, but the ends of the reinforcing structures 4 were not necessarily connected to each other, and instead of being '), they may be installed so that their ends simply overlap each other. In this case, the integration of the 13 structures 4 between the elements is inferior to that of the above embodiment. However, the installation work is extremely easy.

〔Effect of the invention〕

As explained 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 a reinforcing structure is made of H-shaped steel and R temporary. With this structure, the rigidity of the wall can be greatly improved, and the 8i square can be made extremely thin compared to conventional underground continuous walls. Therefore, it is possible to significantly reduce the use of concrete and reduce construction cost, and the space formed by the underground continuous wall can be used efficiently. Moreover, since these H-beams and steel plates are used, these H-beams and steel plates can be easily connected in the width direction, allowing for efficient work.Moreover, there is a strong connection between each element that makes up the underground continuous wall. By achieving integration, the wall becomes even more flute-like and rigid. Furthermore, since there is no need to install a reinforcing bar yard on the ground for manufacturing large ironstone cages, the ground surface can be used effectively.

Further, according to the underground continuous wall described in claim 2, in addition to obtaining the same effects as the underground continuous wall according to claim 1, the H-shaped steel and the R-shaped steel are integrated in advance to form a unit. This structure allows for more efficient on-site erection of the reinforcing structure.

In addition, ■ 4 section steel and 1411 that make up the unit body
Since the connections between the two parts are entirely welded, the welding work for both parts can be performed very easily by automatic welding, and the unit body can be manufactured at low cost.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a part of an underground continuous reinforcing structure according to a first embodiment of the present invention, FIG. 3 is a partial perspective view showing an H-beam according to this embodiment, and FIG. A plan view showing a part of the shaped steel, and Figs. 5 to 9 explain the construction method of the underground continuous wall according to this embodiment, and Figs. 5 and 6 show a part of the wall body. 7 and 8 are vertical sectional views of the excavated hole, FIG. 9 is a partial perspective view showing the reinforcing structure according to the second embodiment of the present invention, and FIG. 1O is the third embodiment of the present invention. A partial perspective view showing a reinforcing structure according to an embodiment, and FIGS. 11 and 12 are partial horizontal sectional views showing an example of a conventional underground continuous wall. ...Underground continuous wall, 2...Wall body,...
... Concrete, 4 ... Reinforcement structure, ... H-beam steel, 7 ... Flange,
a, 7a'...edge, 9'...joint part, 0...rope plate, 10a, 10a...
...Edge, 1.11'...J-kai India Department,
5...Unit body, Engineering 5a. 5a...edge, ■6...steel plate, 6a...edge, 7...joint part.

Claims (2)

[Claims] (1) An underground continuous wall composed of concrete and a reinforcing structure buried in the concrete and reinforcing the concrete, the reinforcing structure being an extension of the wall constituting the underground continuous wall. Consists of a plurality of H-beams arranged at predetermined intervals along the exit direction, and a steel plate of a predetermined width provided between the flanges of these H-beams, and both edges of the flanges of these H-beams and the steel plate. An underground continuous wall characterized in that joint parts that engage with each other are formed at both end edges. (2) An underground continuous wall composed of concrete and a reinforcing structure buried in the concrete and reinforcing the concrete, the reinforcing structure comprising an H-beam and a flange of the H-beam. A steel plate of a predetermined width is fully welded to at least one end edge of the unit body, and a joint portion that engages with each other is formed at both end edges of the unit body. An underground continuous wall characterized by