JP2003261949A - Composite wall formed of earth retaining core and underground exterior wall and its construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composite wall formed of an earth retaining core and an underground exterior wall capable of eliminating troublesome welding work at a construction site, reducing costs and being applied to the great depth. <P>SOLUTION: An H-shaped steel 1 having a gusset plate 2 mounted to the side in advance is buried in the ground, and when an area surrounded by the H-shaped steel 1 is excavated to form an underground space, the gusset plate 2 is exposed, and a mounting plate 4 connected with anchor bars 3 is connected to the exposed gusset plate with bolts. Concrete is placed so as to bury the anchor bars 3 inside of the H-shaped steel to form an underground concrete exterior wall 10. By the constitution, is combined the H-shaped steel 1 with the underground concrete exterior wall 10 with the anchor bars 3 functioning as shear keys. By such a construction method, the anchor bars can be fixed to the H-shaped steel only by bolt connection without welding work at the construction site. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite wall composed of a mountain retaining core material and an underground outer wall, and a construction method thereof.

[0002]

2. Description of the Related Art In recent years, a construction method has been developed in which a mountain retaining core material such as an H-shaped steel used in a soil cement column wall or a steel horizontal sheet pile and a basement outer wall of a building are integrated by laterally welded studs into a composite wall. Has been implemented. Such a construction method makes it possible to reduce the thickness of the basement outer wall by utilizing the mountain retaining core material that was treated as temporary construction as a part of the main construction structure, thus expanding the effective space of the basement floor. It also has the advantage of cost reduction.

[0003]

On the other hand, recently, in order to make effective use of underground, the depth has been increasing, and accompanying this, the soil water pressure acting on the outer wall of the underground is also increasing. For this reason,
The wall thickness required for the underground wall has also become thicker, and the merit of using the composite wall as described above has a greater meaning. However, as the depth increases, the force that acts on the stud that integrates the mountain retaining core material and the underground outer wall also increases, and beyond a certain depth, ordinary in-situ studs cannot handle it, and special studs and welding are required. However, the amount of troublesome work on site increased, which was a factor of cost increase.

In view of such circumstances, the present invention can eliminate the troublesome welding work at the site, reduce the cost, increase the reliability in strength, and increase the depth. It is an object of the present invention to provide a composite wall consisting of a mountain retaining core material and an underground wall that can be sufficiently dealt with, and a construction method thereof.

[0005]

In order to solve the above problems, the following means are adopted in the present invention. That is, in the composite wall of the mountain retaining core material and the underground outer wall according to claim 1, a gusset plate is attached to a side surface of the mountain retaining core material, and an attachment plate to which an anchor bar is joined is bolted to the gusset plate. The anchor bar serves as a shear key, and the mountain retaining core material and the underground concrete outer wall adjacent to the mountain retaining core material are integrated.
With such a structure, the anchor bar can be fixed to the mountain retaining core material by mere bolt joining work without performing welding work in the field, so that no special skill or machine is required for site work and reliability is improved. Anchor muscles can be fixed to high-yielding core materials. Also, by adjusting the diameter and strength of the anchor bar, the number of anchor bars to be mounted per mounting plate, and the spacing between the mounting plates, it is possible to achieve shear key proof strength that is higher than conventional ones, and to increase the depth of synthesis. Even if the force acting on the wall becomes large, it can be easily dealt with.

According to a second aspect of the present invention, in the composite wall of the mountain retaining core material and the underground outer wall, according to the first aspect, a mounting plate having the anchor bar joined to one side of the gusset plate is bolted. Is characterized by. With such a configuration, the composition of the composite wall can be simplified, which facilitates the calculation at the time of strength analysis at the time of design, and is suitable when constructing the composite wall in a place where the depth is not so deep. .

According to a third aspect of the present invention, in the composite wall of the mountain retaining core material and the underground outer wall, in the first aspect, the gusset plate is joined to the right and left sides of the gusset plate by a bolt having a common mounting plate. It is characterized by being. With such a configuration, many anchor muscles can be efficiently fixed to one gusset plate, workability at the site can be improved, and it is suitable when constructing a composite wall at a large depth.

According to a fourth aspect of the present invention, there is provided a composite wall of a mountain retaining core material and an underground outer wall according to the second or third aspect, wherein the attachment plate includes an upward anchor bar inclined obliquely upward with respect to the vertical direction and a vertical line. It is characterized in that two types of anchor muscles, which are downward anchor muscles that incline obliquely downward with respect to the direction, are joined. With such a configuration, it is possible to form a mechanism that mainly transmits the axial force without considering bending and shearing, and it is possible to greatly simplify the strength analysis.

According to a fifth aspect of the present invention, the composite wall of the mountain retaining core material and the underground outer wall is the one according to the second or third aspect, wherein a horizontal anchor bar extending in the horizontal direction is joined to the attachment plate. I am trying. With such a configuration, it is suitable when horizontal force is mainly transmitted between the mountain retaining core material and the underground outer wall.

According to a sixth aspect of the present invention, there is provided a composite wall of a mountain retaining core material and an underground outer wall according to any one of the first to fifth aspects, wherein the gusset plate has a space in the longitudinal direction of the mountain retaining core material. The feature is that a plurality of them are attached at a distance. With such a structure, the horizontal streaks of the underground concrete outer wall can be arranged in the empty space between the gusset plates, and thus the effective wall thickness can be easily secured.

According to a seventh aspect of the present invention, there is provided a method for constructing a composite wall comprising a mountain retaining core material and an underground outer wall, wherein a mountain retaining core material having a gusset plate attached in advance on a side surface is embedded in the soil, and surrounded by the mountain retaining core material. The gusset plate is exposed when an underground space is formed by excavating, and the exposed gusset plate is bolted to a mounting plate to which an anchor bar is joined. It is characterized by pouring concrete to bury underground to form an underground concrete outer wall. With such a configuration, as in the case of the invention according to claim 1, at the site, the anchor bar can be fixed to the mountain retaining core material by simple bolt joining without welding work. It does not require a machine and can fix anchor muscles to a highly reliable mountain retaining core material, which in turn improves the soundness as a synthetic wall.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view in the middle of construction of a composite wall of a mountain retaining core material and an outer underground wall, which is an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line II in FIG.

In these drawings, reference numeral 1 is an H-shaped steel which is an example of a mountain retaining core material used for mountain retaining walls such as soil cement column walls and steel horizontal sheet piles. It is a concrete outer wall. The H-shaped steel 1 and the underground concrete outer wall 10 are interposed between the anchor bars 3 (3a, 3a, 3a, 3c) functioning as shear keys.
b) are integrated to form a synthetic wall W.

Flange 1 on the underground outer wall side of the H-shaped steel 1 building
Gusset plates 2 having a substantially rectangular shape are attached to a by fillet welding along the length direction of the H-shaped steel 1 at predetermined intervals.

The gusset plate 2 has the above-mentioned anchor muscles 3
The mounting plate 4 to which (3a, 3b) is joined is bolted. That is, as shown in FIG. 3, bolt holes 2a are formed in the gusset plate 2, and the bolt holes 4a of the mounting plate 4 are aligned with the bolt holes 2a. In this state, high-strength bolts are inserted into the bolt holes 2a and 4a. 5 is inserted, and a nut (not shown) is screwed onto the bolt insertion end and tightened, whereby the gusset plate 2 and the mounting plate 4 are bolted to each other.

As a bolt joining method of the mounting plate 4 to the gusset plate 2, a combination of high-strength bolts 5 and nuts is used, and the gut plate 2 or the mounting plate 4 is replaced with the bolt holes 2a and 4a. A screw hole may be directly formed, and the tip of the high-strength bolt may be screwed into this screw hole.

Further, in this embodiment, the mounting plates 4 to which the anchor streaks 3 (3a, 3b) are joined are arranged on both left and right sides of the gusset plate 2, and these mounting plates 4 are connected by the common high-strength bolts 5. It is joined to the gusset plate 2.

To the mounting plate 3, two types of anchor rebars are joined by flare welding, namely, an upward anchor bar 3a inclined obliquely upward with respect to the vertical direction and a downward anchor bar 3b inclined obliquely downward with respect to the vertical direction. ing. Here, the downward anchor muscle 3b is slightly bent outward so as not to interfere with each other when overlapping with the upward anchor muscle 3a when viewed from the side (see FIGS. 2 and 3).

Further, the anchor muscle 3 (3a, 3b) has a hook-shaped tip, whereby the anchor length is shortened. In addition, in order to shorten the anchor length, a T-head may be provided at the tip of the other anchor muscle 3 (3a, 3b). The welding of the anchor bars 3 (3a, 3b) to the mounting plate 4 is carried out in advance in the factory in the same manner as the welding of the gusset plate 2 to the H-shaped steel 1.

The underground concrete outer wall 10 has a so-called RC structure in which reinforcing bars (not shown) are buried.
Here, of the reinforcements embedded in the underground concrete outer wall 10, the transverse reinforcements are arranged in the empty space between the gusset plates 2.

Next, a method of constructing a composite wall composed of the mountain retaining core material and the underground outer wall will be described. The gusset plate 2 is attached in advance to the required portion of the flange 1a of the H-shaped steel 1 by welding at the factory. Then, the gusset plate 2 attached to the flange 1a is cured by winding a vinyl sheet or the like to prevent dust and mortar from adhering. In this state, the H-shaped steel 1 is buried in the soil to form an underground wall around the building to be constructed.

On the other hand, the attachment plate 4 to which the anchor bars 3 (3a, 3b) are welded and joined is also prepared in advance in the factory.

Then, a portion surrounded by the underground wall is excavated to form an underground space. At this time, the flange 1a of the H-section steel 1 is exposed, the curing of the gusset plate 2 is removed, and the gusset plate 2 is exposed. On the exposed gusset plate 2, the anchor muscles 3 (3a, 3a, 3
The mounting plate 4 to which b) is joined is bolted.

Next, a reinforcement work is carried out so as not to interfere with the anchor reinforcements 3 (3a, 3b), and a formwork is built inside the reinforcement reinforcements 3 (3a, 3b) and the reinforcement reinforcements are buried. Place concrete. As a result, the anchor muscle 3 (3a, 3b) becomes a shear key, and H
A composite wall W in which the shaped steel 1 and the underground concrete outer wall 10 adjacent thereto are integrated is obtained.

In the above-mentioned composite wall W, the gusset plate 2 attached to the side surface of the H-shaped steel 1 and the anchor bar 3 are provided.
Since the mounting plate 4 to which (3a, 3b) is joined is bolted, at the site, the anchor bar 3 (3a, 3b) is fixed to the H-shaped steel 1 by simple bolt joining without welding work. You can Therefore, it is possible to fix the anchor bar 3 (3a, 3b) to the H-shaped steel 1 with high reliability, without requiring special skill or machine for on-site work.
In addition, since the attachment plate 4 and the high-strength bolt 5 and the like to which the anchor muscles 3 (3a, 3b) are joined are relatively lightweight,
You can proceed with the attachment work of the anchor muscles by holding them, and you can do speedy work.

In the conventional method of laterally welding studs, only studs having a predetermined diameter or less can be welded. To weld studs having a diameter larger than that, a specially shaped stud is used. There was no other way but to use enclosed welding. However,
In the above-mentioned synthetic wall W, since the anchor bars 3 (3a, 3b) are welded to the mounting plate 4 in advance in a factory or the like,
The anchor muscles 3 (3a, 3b) having an arbitrary diameter can be joined, and in addition, the strength of the anchor muscles 3 (3a, 3b),
Also, the anchor bar 3 (3a, per mounting plate)
By adjusting the number of attachments in 3b) and the distance between the attachment plates 4, it is possible to realize shear key proof strength higher than the conventional one, and it is possible to easily cope with the increase in the force acting on the composite wall due to the increase in depth.

Further, the mounting of the gusset plate 2 on the H-shaped steel 1 and the mounting of the anchor bar 3 (3a, 3b) on the mounting plate 4 can be carried out in a factory which is easy to manufacture, and stable welding can be performed. It is possible to reduce the welding cost.

Further, a plurality of gusset plates 2 are attached at intervals in the length direction of the H-shaped steel 1, and the horizontal streaks of the underground concrete outer wall 10 can be arranged in the vacant spaces between these gusset plates 2. This facilitates ensuring the effective wall thickness. By the way, if a continuous long gusset plate 2 is used, the horizontal stripes must be arranged inside the gusset plate 2, and it becomes difficult to secure an effective wall thickness unless the construction accuracy control of the mountain retaining core material is strict.

Further, in the conventional stud welding, a horizontal straight type anchor bar was used, but in this case, bending, shearing, and axial force act simultaneously on the welded joint of the anchor bar, which causes a complicated resistance mechanism. Was becoming. However, in the above-mentioned synthetic wall W, since the upward anchor bar 3a or the downward anchor bar 3b that is inclined obliquely with respect to the vertical direction is used, the weld joint of the anchor bar mainly applies the axial force without considering bending or shearing. It is possible to form a mechanism to transmit as, and it becomes very simple in strength analysis.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and other configurations can be adopted without departing from the spirit of the present invention. Is.

For example, in the above embodiment, as shown in FIG. 2, the anchor muscles 3 (3) are provided on both sides of the gusset plate 2.
a, 3b) are attached to the mounting plate 4 by bolts, but the present invention is not limited to this, and the anchor plate 3 (3a, 3b) is attached to only one side of the gusset plate 2 by the bolts. You may make it join.

Further, in the above-described embodiment, as shown in FIG. 1, the attachment plate 4 has an upward anchor bar 3a or a downward anchor bar 3b which is inclined obliquely to the vertical direction.
Are joined by flare welding, but the invention is not limited to this, and as shown in FIG.
4 may be joined laterally by flare welding so as to extend in the horizontal direction. Further, as shown in FIG. 4B, the anchor bar 16 is butt-welded in the lateral direction so as to extend in the horizontal direction on the mounting plate 15. You may attach by.

[0033]

As described above, according to the present invention,
At the site, the anchor bar can be fixed to the mountain retaining core material by simple bolt connection without welding work.
Therefore, it does not require a special skill or machine for on-site work, and can perform reliable anchor muscle fixation, the diameter and strength of the anchor muscle, the number of anchor muscles per mounting plate, and the number of mounting plates. By adjusting the spacing,
It is possible to achieve shear-key proof strength higher than that of the conventional one, and it is possible to easily cope with the increase in the force acting on the composite wall due to the increase in depth.

[Brief description of drawings]

FIG. 1 is a side view in the middle of construction of a composite wall consisting of a mountain retaining core material and an underground outer wall, which is an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line I-I of FIG.

FIG. 3 is an exploded perspective view of a part of a composite wall of the mountain retaining core material and the underground outer wall shown in FIGS. 1 and 2.

FIG. 4 is a side view in the middle of construction of a composite wall of a mountain retaining core material and an underground outer wall, which is another embodiment of the present invention.

[Explanation of symbols]

1 H-section steel (mounting core material) 2, gusset plate 3,14,16 Anchor muscle 3 (3a) Upward anchor muscle 3 (3b) Downward anchor muscle 4, 13, 15 mounting plate 5 high strength bolts

Claims (7)

[Claims] 1. A gusset plate is attached to a side surface of the mountain retaining core material, and a mounting plate having an anchor bar joined thereto is bolted to the gusset plate, and the anchor bar serves as a sheer key and is adjacent to the mountain retaining core material. A composite wall consisting of a mountain retaining core material and an underground outer wall, which is characterized by being integrated with an underground concrete outer wall. 2. The composite wall of the earth retaining core material and the underground outer wall according to claim 1, wherein a mounting plate to which the anchor bar is joined is bolted to one side of the gusset plate. A composite wall consisting of a core material and an underground wall. 3. The composite wall of the mountain clasp core material and the underground outer wall according to claim 1, wherein the attachment plates to which the anchor bars are joined are joined to the right and left sides of the gusset plate by common bolts, respectively. A composite wall consisting of a mountain retaining core material and an underground wall. 4. The composite wall of the mountain retaining core material and the underground outer wall according to claim 2 or 3, wherein the attachment plate has an upward anchor bar inclined obliquely upward with respect to the vertical direction and an oblique downward direction with respect to the vertical direction. A composite wall consisting of a mountain retaining core material and an outer underground wall, in which two types of anchor rebars inclined downward are joined. 5. The composite wall of the earth retaining core material according to claim 2 or 3, wherein a horizontal anchor bar extending in a horizontal direction is joined to the mounting plate. And a basement outer wall. 6. The composite wall of the mountain clasp core material and the underground outer wall according to claim 1, wherein a plurality of the gusset plates are attached at intervals in the length direction of the mountain clasp core material. A composite wall consisting of a mountain retaining core and an underground wall. 7. The gusset plate having a gusset plate previously attached to the side surface is embedded in the soil, and the gusset plate is exposed when an underground space is formed by excavating a portion surrounded by the mountain keeper plate. The mounting plate to which the anchor bar is joined is bolted to the gusset plate, and inside the mountain retaining core material, concrete is driven to embed the anchor bar to form an underground concrete outer wall. Construction method of a composite wall consisting of a mountain retaining core material and an underground wall.