JP2661990B2 - How to build an underground wall with columns - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to an underground wall constructed over a predetermined length along a side surface of a ground, comprising: a flat wall portion; And an underground wall having a pillar portion protruding from the underground wall. The ground pile referred to in the present invention has a broad concept including a retaining wall and the like.

[Conventional technology]

Conventionally, when constructing an underground wall, a formwork is arranged according to its shape, and bolts are laid between one side and the other side at each point of the formwork to be cast inside. It was made to support concrete. The same applies to an underground wall having a wall portion and a pillar portion and having irregularities on the side surface. Both the wall portion having a small wall thickness and the pillar portion having a large wall thickness have front and rear molds. Bolts were passed between the frames to support the lateral pressure of the concrete to be cast.

[Problems to be solved by the invention]

However, according to such a conventional underground wall construction method, the number of bolts used increases in order to pass the bolts through both the small wall thickness portion and the large wall thickness portion, and the bolt installation work is increased. In some cases, there is a problem that the removal work is complicated. Also, the large number of bolts used adversely affects the strength of the underground wall,
There is a problem that water leaks from the gap due to breathing at the bottom of the bolt is likely to occur.

The present invention has been made in view of the above-mentioned disadvantages of the related art, and simplifies the work of installing a formwork, and also reduces the number of bolts used to simplify the work of assembling the formwork. It is intended to be.

[Means for solving the problem]

The method of constructing an underground wall with a pillar according to the present invention includes a plurality of groove-shaped forms having a central portion and bent portions at both ends and formed in a cross-sectional groove shape. And the outer surface of the central part is installed facing the ground side to form a space for a wall between the center part and the ground side of the channel form, and the adjacent channel forms are adjacent to each other. Forming a column space between the bent portions, further spanning a closing form for closing the front surface of the column space between the distal end surfaces of both bent portions forming the column space, on the surface of this closing form After arranging the shoring and laying a tension rod between the shoring and the ground side, concrete is poured into the column space and the wall space, and concrete is formed by the tension rod and the shoring. It is characterized by supporting lateral pressure.

By arranging at least a horizontal flap as the shoring, the left and right ends of the horizontal flap are bent in a hook shape, and the hook portion is engaged with the inner surface of the bent portion of the channel-shaped form, whereby the It is preferable to support the side pressure of the bent portion.

[Action]

Just by arranging a plurality of grooved forms with their bent parts next to each other, a space for pillars can be formed between both bent parts, and a space for walls can be formed between the central part and the ground side, and the adjacent bent parts Since the closing form is bridged between the tip surfaces of the portions, by supporting the closing form, the supporting force extends to the center portion of the grooved form via the bent portion. For this reason, only by supporting the closing form, it is possible to support the concrete lateral pressure cast in both the column space and the wall space.
Therefore, it is sufficient to install a tension rod such as a bolt only between the support on the front surface of the closing form and the ground side.

In addition, at least a horizontal flap is arranged as a support on the front surface of the closing form, and the left and right ends of the horizontal flap are bent in a hook shape, and the hook portion is bent into a bent portion of the groove-shaped form. By engaging with the inner surface, it is possible to support a side pressure acting in a direction in which both adjacent bent portions move away from each other.

〔Example〕

FIGS. 1 and 2 show a first embodiment of the present invention. Here, 1 is a channel-shaped form having a central portion 11 and bent portions 12 and 13 at both ends thereof. In this embodiment, a concrete form is used, but a form made of a rope or another known material is also used. Can be used. A plurality of the channel-shaped forms 1 are placed adjacent to each other with an interval between the outer surfaces 12a and 13a of the bent portions 12 and 13, and the outer surface 11a of the central portion 11 is placed toward the ground 2 side. This forms a space 3 for the wall between the central portion 11 of the channel form 1 and the ground 2 side, and also between the outer surfaces 12a, 13a of the adjacent bent portions 12, 13 of the adjacent channel form 1. A column space 4 is formed in the column.

Further, a closing form 5 for covering the front surface of the column space 4 is bridged between the front end surfaces of both the bent portions 12 and 13 forming the column space 4, and a support 6 is provided on the surface of the closing form 5. Place.
The material of the closing form 5 is concrete, rope, or another known material. The support 6 includes a plurality of vertical butterflies 61 extending in a vertical direction and a horizontal flap 62 extending in a horizontal direction. Horizontal Flip 62
Is a U-shaped metal having a hook-shaped portion 62a whose end is bent in a hook shape, and this hook-shaped portion 62a is
Engage with inner surfaces 12b, 13b of 2,13.

Also, a plurality of parent piles 7 are driven into the surface of the ground 2 at appropriate intervals, and the formwork 8 is engaged with the piles.
Is fixed, and a tension rod 15 is installed between the horizontal member 9 and the horizontal flap 62. The base end of the tension rod 15 is fixed to the cross member 9 by welding or the like, and the front end thereof is exposed to the surface of the support 6 through the closing form 5 and the horizontal flap 62,
A nut 16 is screwed into the tip.

In this state, concrete 17 for forming the underground wall is cast between the ground 2 and the channel-shaped form 1, that is, between the wall space 3 and the column space 4.

Thus, the lateral pressure of the concrete 17 is supported by the ground 2 on the ground 2 side, and is supported by the tension rod 15 on the channel form 1 side. That is, the lateral pressure of the wall space 3 portion applied to the central portion 11 is the bent portions 12 and 13 and the closing form 5
And the side pressure of the column space 4 directly applied to the closing formwork 5 is also transmitted to the support 6. In the shoring 6, the load is transmitted from the vertical butter 61 to the horizontal butter 62, and this is supported by the tension rod 15. Thus, the lateral pressure of the concrete 17 is supported by the tension rod 15 on the ground 2 side.

Note that the lateral pressure of the concrete 17 applied to the outer surfaces 12a and 13a of the bent portions 12 and 13
Since the hook-shaped portions 62a at both ends of the horizontal flap 62 are engaged with the b and 12b, the horizontal flap 62 acts as forces on both sides in the longitudinal direction thereof and is offset.

Thus, any side pressure away from the side of the ground 2 is supported by the tension rod 15.

Due to the hardening of the concrete 17, the channel form 1 forms a part of the underground wall integrally with the concrete 17 as a driving form. Therefore, after the concrete 17 has hardened, the nut 16
The supporter 6, and the closing form 5 may be removed. Then, the protruding end of the tension rod 15 is cut, and the surface on which the closing formwork is located is finished.

It is needless to say that the channel form 1 may be removed after the concrete 17 is hardened. In this case, the surface is finished after the channel form 1 is removed. . In this embodiment, the closing form 5 is removed after the concrete 17 is hardened. However, the closing form 5 may be used as a surface material of the underground wall like the channel form 1.

FIG. 3 is a view showing a second embodiment, in which a rock borrow 18 is driven into the ground 2 in place of the parent pile 7, the disposal form 8 and the cross member 9 of the first embodiment, and a tension rod 15 2 shows an example in which the base end is fixed. This embodiment is suitable for a case where a concrete layer is provided on the surface of the ground 2, but is not necessarily limited to that case.
Any type of ground 2 that can obtain a holding power of 18 can be used. The other method is the same as that of the first embodiment, and the description is omitted.

FIG. 4 is a view showing the third embodiment, and is an example in the case where there is a gap 19 due to extra excavation on the ground 2 side. In this case, the mold 8 is disposed in the gap 19, and the horizontal flutter 21 and the vertical flutter 22 are applied to the ground 2 side thereof.
Then, a nut 24 is screwed into the end of the tension rod 15. A cut beam 25 is arranged between the back surface of the horizontal flutter 21 and the surface of the ground 2 to function as a spacer for the space 19. Space after hardening of concrete 17
19 may be embedded with a suitable material such as earth and sand.

This method is the same as in the first embodiment, and a description thereof will be omitted.

Although each of the above embodiments employs different means for the processing method between the underground wall and the ground 2, each of these known means can be employed. It is also possible to combine the above means.

〔The invention's effect〕

As described above, in the present invention, a plurality of grooved forms are arranged between the bent portions only by arranging the bent portions adjacent to each other. A space can be formed, and the closing form is bridged between the end faces of the adjacent bent portions. Therefore, by supporting this closing form, the supporting force is reduced by the bending portion of the groove-shaped form. Through to its central part. For this reason, only by supporting the closing form, it is possible to support the concrete lateral pressure cast in both the column space and the wall space. Therefore, since it is sufficient to install a tension rod such as a bolt only between the support on the front surface of the closing form and the ground side, the work of installing the form is simplified and the number of bolts used is reduced. This has the effect of simplifying the work of assembling the formwork.

In addition, at least a horizontal flap is arranged as a support on the front surface of the closing form, and the left and right ends of the horizontal flap are bent in a hook shape, and the hook portion is bent into a bent portion of the groove-shaped form. By engaging the inner surface, the adjacent bent portions can support a side pressure acting in a direction away from each other, and therefore, there is an effect that even if the strength of the bent portion of the grooved form is small, it is sufficient.

[Brief description of the drawings]

1 is a plan sectional view of the first embodiment, FIG. 2 is a partial perspective view of FIG. 1, FIG. 3 is a plan sectional view of the second embodiment, and FIG.
It is a plane sectional view of an example. 1 ... channel-shaped formwork, 2 ... ground pile, 3 ... wall space, 4 ...
Column space, 5 ... closing formwork, 6 ... support, 11 ... central part, 12,13 ... bending part, 12a, 12a ... outer surface, 12b, 13b ...
… Inner surface, 15… Tension rod, 17… Concrete, 61… Vertical flutter, 62… Horizontal flutter

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-197315 (JP, A) JP-A-1-295914 (JP, A)

Claims (2)

(57) [Claims] 1. A plurality of channel-shaped forms having a central portion and bent portions at both ends thereof and formed in a groove shape in cross section are adjacent to each other with an interval between the outer surfaces of the bent portions, and With the outer surface facing the ground side, a space for the wall is formed between the center of the channel form and the ground side, and a space for the pillar is formed between the adjacent bent parts of the adjacent channel forms. Formed, and a bridge for closing the front surface of the column space is bridged between the end surfaces of both bent portions forming the column space, and a supporter is disposed on the surface of the block form, After the tension rod is erected between the work and the ground side, concrete is poured into the column space and the wall space, and the lateral pressure of the concrete is supported by the tension rod and the shoring. How to build an underground wall with pillars. At least a horizontal flap is provided as a support on the front surface of the closing form, and the left and right ends of the horizontal flap are bent in a hook shape, and the hook-shaped portion is formed into a groove-shaped form. The method according to claim 1, wherein the lateral pressure of the bent portion is supported by engaging the inner surface of the bent portion.