JP3725517B2 - Synthetic underground wall - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a synthetic underground wall, and in particular, to a synthetic underground wall in which a core material of a soil cement column wall and an underground wall made of reinforced concrete are integrated with a stud bolt.
[0002]
[Background]
In general, when underground excavation is performed, a plurality of drill holes are continuously formed in the ground, and soil cement is injected into the drill holes, and H-shaped steel materials that are a plurality of core materials as stress bearing members in the soil cement. It is known to use a soil cement column wall as a structure retaining structure by inserting a wall.
[0003]
And after underground excavation, the soil cement column wall is left as it is, and the underground wall made of reinforced concrete is constructed inside.
[0004]
However, in this case, since the underground wall is constructed independently regardless of the soil cement column wall, a large wall thickness is required, and the underground work takes time.
[0005]
Therefore, for the purpose of rationalizing the underground work and reducing the wall thickness, a synthetic underground wall as shown in FIGS. 8 and 9 is being constructed.
[0006]
In this synthetic underground wall, after the soil cement column wall 10 is constructed and underground excavation is performed, the soil cement 12 is shaved to expose the surface of the core material 14 made of an H-shaped steel material, and a plurality of studs are provided there. Bolts 16 are attached.
[0007]
And the wall reinforcement 18 is arrange | positioned and the concrete 20 is cast, and the soil cement column wall 10 and the underground wall 22 are integrated via the stud bolt 16 (nonpatent literature). 1).
[0008]
[Non-Patent Document 1]
Summaries of Annual Meetings of the Architectural Institute of Japan (China) September 1999 Study on effective use of soil cement column wall core material (Part 1) Outline of the study and direct shear experiment Ichiro Yamaura, Yoshiyuki Murata, Tatsuo Fujiwara, Hayato Sakai, Yoshio Nakamura , Osamu Kaneko (Figure 1 Outline of RCS composite underground wall)
[0009]
[Problems to be solved by the invention]
In the above-described synthetic underground wall, as shown in FIG. 9, even if the wall thickness t2 of the underground wall 22 is made thinner than the required wall thickness t1 of the underground wall when not to be a synthetic underground wall, sufficient synthetic underground wall An effective wall thickness t3 as a wall can be obtained.
[0010]
However, the above-mentioned synthetic underground wall considers only resistance to soil water pressure, and when the wall thickness of the underground wall 22 is determined by in-plane shearing, it leads to reduction of the wall thickness and rationalization of the underground work. There is no problem.
[0011]
An object of the present invention is to provide a synthetic underground wall that can achieve reduction in wall thickness and rationalization of underground work even when the wall thickness is determined by in-plane shearing.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the synthetic underground wall of the present invention is constructed within a soil cement column wall in which a plurality of stress-bearing core members are disposed in the soil cement, and inside the soil cement column wall. A synthetic underground wall obtained by integrating a reinforced concrete underground wall with a stud bolt attached to the core material of the soil cement column wall,
The core material of the soil cement column wall is formed by connecting at least a core material at both ends with a steel material for every predetermined number.
[0013]
According to the present invention, a brace structure is formed by a steel material by connecting at least the core materials of both ends of the core material of the soil cement column wall with a steel material for each predetermined number, and an in-plane shear resistance element is formed. It is possible to make the core material not only resistant to soil water pressure but also resistant to in-plane shearing, so that the core material can be used effectively and the wall thickness is determined by in-plane shearing. However, it is possible to reduce the cost by further reducing the wall thickness in order to have sufficient in-plane shear resistance, shorten the construction period, and achieve rationalization of the construction.
[0014]
Therefore, the synthetic underground wall can be used as a seismic wall.
[0015]
In the present invention, an intermediate core material positioned between the core materials at both ends can also be connected by the steel material.
[0016]
By setting it as such a structure, rigidity can be improved further and in-plane shear resistance can also be enlarged.
[0017]
In the present invention, a mold steel material can be used as the steel material.
[0018]
By adopting such a configuration, since the steel mold material is embedded in the underground wall, the steel mold material can be used as a strong connection member between the soil cement column wall and the underground wall, and the number of stud bolts attached can be reduced. It is possible to shorten the construction period by reducing the thickness, and also to reduce the wall thickness.
[0019]
In the present invention, the steel material can be arranged in an X shape over a predetermined number of core materials.
[0020]
By setting it as such a structure, a core material can be used as a reliable in-plane shear resistance element, and can give a big earthquake resistance.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0022]
1-3 is a figure which shows the synthetic underground wall which concerns on one embodiment of this invention.
[0023]
This synthetic underground wall 30 is constructed such that a reinforced concrete underground wall 34 is integrally constructed inside a soil cement column wall 32 and used as a seismic wall.
[0024]
In the soil cement column wall 32, a plurality of drill holes 36 are continuously formed in the ground, and the soil cement 38 is injected into the drill holes 36, and a plurality of core members 40 for stress bearing are provided in the soil cement 38. The H-shaped steel material is inserted into a structure, and the soil cement column wall 32 is used as a retaining wall to excavate the inside.
[0025]
Further, the soil cement column wall 32 is formed by cutting the soil cement 38 to expose the surface of the core material 40 when the underground wall 34 is constructed, and the core material 40 is formed by two H-shaped steel materials 42 every predetermined number. I try to connect them.
[0026]
The two H-shaped steel members 42 are arranged in an X shape over a predetermined number of core members 40 and are fixed to the core members 40 via bolts 43.
[0027]
Here, the number of the core members 40 is five. However, the number of the core members 40 is not limited to this, and various numbers can be used depending on the construction conditions.
[0028]
Instead of the bolt 43, it may be fixed by welding.
[0029]
Therefore, since the core members 40 at both ends are connected by the two H-shaped steel members 42, a large in-plane shear resistance element is obtained, and the seismic resistance can be increased.
[0030]
Moreover, since not only the core material 40 of both ends but the core material 40 located in the middle is also connected by the two H-shaped steel materials 42, it can be made more rigid.
[0031]
Furthermore, a plurality of stud bolts 44 are attached to a portion of the surface of the core member 40 where the H-shaped steel material 42 is not attached.
[0032]
And by arranging the wall reinforcement 46 inside the soil cement column wall 32 and placing concrete 48, the soil cement column wall 32 and the underground wall through the stud bolt 44 and the H-shaped steel material 42. 34 is integrated.
[0033]
Thus, by embedding not only the stud bolt 44 but also the H-shaped steel material 42 in the underground wall 34, the soil cement column wall 32 and the underground wall 34 can be firmly connected and integrated, and high strength is achieved. The synthetic underground wall 30 can be formed.
[0034]
Further, by using the H-shaped steel material 42 for connecting and integrating the soil cement column wall 32 and the underground wall 34, the number of stud bolts 44 can be reduced, the work can be rationalized, and the construction period can be shortened. it can.
[0035]
Furthermore, even when the wall thickness is determined by in-plane shearing, the wall thickness can be further reduced by reducing the wall thickness because of sufficient in-plane shear resistance, and the construction period can be shortened.
[0036]
In place of the H-shaped steel material 42, a steel mold material such as an angle-shaped steel material or an I-shaped steel material may be used.
[0037]
FIG. 4 shows another embodiment of the present invention.
[0038]
In the present embodiment, two flat steel members 50 are arranged in an X shape over a predetermined number of core members 40 of the soil cement column wall 32.
[0039]
The two flat steel members 50 are attached and fixed to the core member 40 at both ends and the intermediate core member 40 positioned therebetween by bolts or welding (not shown).
[0040]
In this case, since the flat steel material 50 is used unlike the H-shaped steel material 42 in the above-described embodiment, the core material 40 has a sufficient in-plane shear resistance element, but the soil cement column wall 32 and the underground wall 34 is not an element to connect with.
[0041]
Therefore, the number of the stud bolts 44 is increased as compared with the case of the above-described embodiment, and the soil cement column wall 32 and the underground wall 34 are preferably attached so that the stud bolts 44 are also attached to the surface of the flat steel material 50. It is advisable to increase the connection strength.
[0042]
Other configurations and operations are the same as those in the above embodiment, and a description thereof is omitted.
[0043]
FIG. 5 shows still another embodiment of the present invention.
[0044]
In this embodiment, two H-shaped steel members 52 are arranged in a V shape over a predetermined number of core members 40 of the soil cement column wall 32, and each H-shaped steel member 52 and each core member 40 are illustrated. The core material 40 at both ends is connected through the H-shaped steel material 52 and the intermediate core material 40 located between both ends is also connected by the H-shaped steel material 52. ing.
[0045]
Other configurations and operations are the same as those of the embodiment of FIGS.
[0046]
FIG. 6 shows still another embodiment of the present invention.
[0047]
In this embodiment, contrary to the embodiment of FIG. 5, two H-shaped steel members 52 are arranged in an inverted V shape over a predetermined number of core members 40 of the soil cement column wall 32, and each H The shape steel material 52 and each core material 40 are connected and fixed by bolts or welding (not shown), the core materials 40 at both ends are connected to each other via the H-type steel material 52, and an intermediate core material located between both ends is connected. 40 is also connected by an H-shaped steel material 52.
[0048]
Other configurations and operations are the same as those of the embodiment of FIGS.
[0049]
FIG. 7 shows still another embodiment of the present invention.
[0050]
In this embodiment, two H-shaped steel members 54 are arranged in parallel over the upper end position and the lower end position of a predetermined number of core members 40 of the soil cement column wall 32, and each H-shaped steel member 54 and each core member 40. Are connected and fixed by bolts or welding (not shown), and the core members 40 at both ends and the intermediate core member 40 positioned between both ends are connected through the H-shaped steel material 54.
[0051]
In this case, if the H-shaped steel material 54 and the core material 40 are connected and fixed in a rotatable state, the core material 40 does not become an in-plane shear resistance element. Therefore, the H-shaped steel material 54 and the core material 40 are the number of bolts. It is necessary to make a rigid joint by increasing the number of welds or performing sufficient welding.
[0052]
Other configurations and operations are the same as those of the embodiment of FIGS.
[0053]
In addition, in embodiment of FIGS. 5-7, it replaces with the H-shaped steel materials 52 and 54, type steel materials, such as a flat steel material, an angle type steel material, and an I-type steel material, can also be used, when using a flat steel material. As in the embodiment of FIG. 4, since the flat steel material does not become an element for connecting the soil cement column wall and the underground wall, the number of stud bolts for each core material can be increased, It is preferable to attach a stud bolt.
[0054]
The present invention is not limited to the above-described embodiment, and can be modified into various forms within the scope of the gist of the present invention.
[0055]
For example, in the above-described embodiment, an H-type steel material is used as the core material of the soil cement column wall. However, the present invention is not limited to this example. If possible, various core materials can be employed.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a synthetic underground wall according to an embodiment of the present invention in a partial cross section.
FIG. 2 is a partial cross-sectional view of FIG.
3 is a perspective view showing a state in which an H-shaped steel material is attached to the soil cement column wall of FIGS. 1 and 2. FIG.
FIG. 4 is a perspective view showing a state in which a flat steel material is attached in an X shape to a soil cement column wall in a synthetic underground wall according to another embodiment of the present invention.
FIG. 5 is a front view showing a state in which an H-shaped steel material is attached in a V shape to a soil cement column wall of a synthetic underground wall according to still another embodiment of the present invention.
FIG. 6 is a front view showing a state in which an H-shaped steel material is attached in an inverted V shape to a soil cement column wall of a synthetic underground wall according to still another embodiment of the present invention.
FIG. 7 is a front view showing a state in which an H-shaped steel material is attached in parallel to an upper end portion and a lower end portion of a soil cement column wall of a synthetic underground wall according to still another embodiment of the present invention.
FIG. 8 is a partially broken perspective view showing a synthetic underground wall in the background art.
9 is a partial cross-sectional view of FIG.
[Explanation of symbols]
30 Synthetic underground wall 32 Soil cement column wall 34 Underground wall 38 Soil cement 40 Core materials 42, 52, 54 H-type steel material 44 Stud bolt 46 Wall reinforcement 48 Concrete 50 Flat steel material

Claims (4)

A soil cement column wall in which a plurality of stress-bearing core materials are arranged in the soil cement, and an underground wall made of reinforced concrete built inside the soil cement column wall, the soil cement column wall A synthetic underground wall integrated with stud bolts attached to the core material,
A synthetic underground wall characterized in that the core material of the soil cement column wall is connected with steel materials at least at both ends by a steel material for every predetermined number. In claim 1,
A synthetic underground wall characterized in that an intermediate core member located between the core members at both ends is also connected by the steel member. In claim 1 or 2,
A synthetic underground wall, wherein a mold steel material is used as the steel material. In any one of Claims 1-3,
A synthetic underground wall, wherein the steel material is arranged in an X shape over a predetermined number of core members.

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