JP2022111554A - Architectural structure and its construction method - Google Patents

Abstract

To provide an architectural structure where a building's lateral wall and a soil cement column row type continuous wall disposed on the peripheral of the building are firmly connected and a construction method of an architectural structure that can construct this architectural structure efficiently.SOLUTION: In an architectural structure 100, a lateral wall 15 of an underground part 11 in a soil G that a building 10 comprises and a soil cement column row type continuous wall 20 disposed on the peripheral of the building 10 are connected, the lateral wall 15 of the underground part 11 and the soil cement column row type continuous wall 20 are mutually bound with a tendon 50 into which a tensioning force is introduced, and in a contact surface 18 between the lateral wall 15 and the soil cement column row type continuous wall 20, a load transfer mechanism 60 with a frictional force is formed.SELECTED DRAWING: Figure 1

Description

The present invention relates to a building and its construction method.

Retaining walls include ready-made sheet pile walls such as main pile horizontal sheet pile walls and steel sheet pile walls, and cast-in-place walls such as column row retaining walls and continuous underground walls. There are row retaining walls, steel pipe column retaining walls, soil cement column retaining walls (soil cement column continuous walls), and so on.

For example, while the above-mentioned soil cement column type continuous wall is a temporary structure, the soil cement column type continuous wall can be used as a permanent structure by being connected to the side wall of the underground part of the building that is the permanent structure. There is also a form that is used as part of the foundation of a building.

A soil cement column type continuous wall is formed by overlapping cylindrical soil cements, and a core material made of H-beam steel or the like is embedded in each soil cement. In order to connect the soil cement column continuous wall and the permanent structure, the upper part of the soil cement on the side of the permanent structure is removed to expose a part of the core material. A plurality of stud dowels, etc. are welded to the exposed part of the material to protrude to the side, and the side wall of the underground part of the permanent structure is constructed in the ground so that each stud dowel, etc. is buried, A form in which both are integrated is mentioned.

Here, Patent Document 1 discloses a soil cement wall pile composed of a soil cement column row wall provided so as to reach an underground support layer. In this soil cement wall pile, the soil cement in the bearing layer is composed of high-strength soil cement, and multiple steel frames are arranged in the horizontal direction, and these multiple steel frames are connected to each other on both sides of the wall surface and extend in the horizontal direction. A core member comprising a steel material is embedded in the soil cement, and studs are provided on the surface of the steel material facing the other steel material and on the inner wall surface of the steel frame, including the area located in the support layer. It is In addition, here, when constructing the underground structure of the building after constructing the soil cement column wall, shear connectors etc. are attached to the soil cement column wall and the soil cement column wall and the underground structure of the building are integrated. There is a description to the effect that it will be constructed.

Japanese Patent No. 4466418

As described in Patent Document 1, in the case of integrating the soil cement column type continuous wall with the underground structure of the building, conventionally, a core made of, for example, H-beam steel constituting the soil cement column type continuous wall Measures have been taken to bury shear connectors such as stud dowels projecting from the timber into the side walls of the building. However, since the stud dowels protruding from one of the flanges of the H-beam are only embedded halfway through the thickness of the side wall of the building, a large number of stud dowels are needed to obtain a certain level of connection strength. Therefore, when a stud dowel or the like is welded to the core material at the site, processing time becomes a big problem.

The present invention has been made in view of the above problems, and provides a building in which the side wall of the building is firmly connected to the soil cement column continuous wall constructed around the building, and the building. It aims at providing the construction method of the building which can construct efficiently.

In order to achieve the above object, one aspect of the building according to the present invention is
A building in which a side wall of an underground portion provided in the ground and provided in the building is connected to a soil cement column series continuous wall provided around the building,
wherein the side wall of the underground section and the continuous soil cement columned wall are tied together by tendons into which tension is introduced;
A load transmission mechanism based on frictional force is formed on a contact surface between the side wall and the soil cement column type continuous wall.

According to this aspect, the side wall of the underground part of the building provided in the ground and the continuous wall of the soil cement column type are connected to each other by the tendon to which the tension force is introduced, so that, for example, Connection by means of stud dowels, etc., which are only partially embedded in the thickness of the side wall and can be used to bind the entire side wall of the building (total thickness of the side wall) with tendon. A building with significantly higher connection strength than the structure is formed. In addition, a load transmission mechanism is formed by frictional force on the contact surface between the side wall and the soil cement column continuous wall, which are mutually tightened by the tendons to which the tension force is introduced, so that the building's strength increases. A vertical load caused by its own weight or the like can be transmitted to the ground via a soil cement column continuous wall via a load transmission mechanism based on frictional force.

In this aspect, a building is formed by a building and a continuous soil-cement columned wall constructed around the building and integrated with the building.

For example, if the building is RC (Reinforced Concrete) construction, the soil cement column type continuous wall and the RC construction wall form a load transmission mechanism by frictional force, and the building is S (Steel) construction. In the case of (2), the soil-cement column continuous wall and the S structure wall form a load transmission mechanism by frictional force.

Also, in another aspect of the building according to the present invention,
said prestressing tendons comprising a prestressing steel and first and second anchorages at opposite ends of said prestressing steel;
The soil cement column type continuous wall has a core material embedded inside the soil cement,
The core member is formed of H-beam steel comprising a first flange on the building side, a second flange on the side opposite to the building, and a web,
a first through-hole and a second through-hole through which the tension steel passes are formed at corresponding positions of the first flange and the side wall, respectively;
One end of the steel tension extending through the corresponding first and second through holes is fixed to the first flange via the first fixing body, and the other end of the steel tension is fixed to the first flange. 2 fixing member is fixed to the side wall.

According to this aspect, the tension constituting the tendon is applied to the through holes (the first through hole and the second through hole) of both the building-side first flange and the side wall of the core material formed of H-shaped steel. A steel member is passed through, and one end of the tension steel member is fixed to the first flange via the first fixing member, and the other end is fixed to the side wall via the second fixing member, so that the first flange and the side wall of the building are fixed. A load transmission mechanism with high frictional force is formed at the contact surface of the . In addition, since one end of the tension steel is fixed (fixed) via the first fixing body to the first flange on the building side of the core material formed by the H-section steel, the core material and the tension steel are fixed. can be easily done.

Also, in another aspect of the building according to the present invention,
A third through hole is formed in the core material,
The third through hole is filled with soil cement, and a load transmission mechanism is formed by bearing force of the soil cement.

According to this aspect, since the soil cement enters the third through-hole formed in the core material, a load transmission mechanism is formed by the supporting force of the soil cement, thereby supporting the concrete against shear slippage. It can effectively resist pressure. Here, a reinforcing bar may be passed through the third through-hole, and in this case, additional resistance is added by the reinforcing bar.

Also, in another aspect of the building according to the present invention,
A stud dowel is attached to the core material,
A load transmission mechanism is formed by the shearing force and/or bearing force of the stud dowel embedded in the soil cement.

According to this aspect, since the stud dowel is attached to the core material, shear deviation can be effectively resisted by the load transmission mechanism based on the shear force and/or bearing force of the stud dowel.

Also, in another aspect of the building according to the present invention,
The contact surface of the first flange is provided with surface irregularities,
The side wall is formed of reinforced concrete, and the concrete meshes with the surface unevenness.

According to this aspect, the contact surface of the first flange is provided with surface irregularities, and the concrete of the reinforced concrete side wall meshes with the surface irregularities, so that the load transmission mechanism is based on the frictional force formed on both contact surfaces. The load transmission performance of the can be further enhanced.

In addition, one aspect of the method for constructing a building according to the present invention is
The side wall of the basement of the building in the ground and the continuous wall of the soil cement column type provided around the building are composed of tension steel, first anchorages at both ends of the tension steel, and A method of constructing a building connected by a tendon comprising a second anchorage, comprising:
An H-shape comprising soil cement and a core embedded in the soil cement, the core comprising a first flange on the building side, a second flange on the opposite side of the building, and a web. A step of constructing a continuous wall with soil cement columns made of steel;
cutting the soil cement at the upper end of the soil cement column continuous wall to expose a portion of the first flange;
one end of the tension steel is passed through a first through hole formed in the first flange, and one end of the tension steel is fixed to the first fixing body installed on the back surface of the first flange; B step;
In the building, the side wall is constructed to contact at least the first flange, the other end of the tension steel is passed through the side wall, and the tension steel is attached to the second fixing body installed on the indoor side of the side wall. By fixing the other end and introducing a tension force to the tendon, the side wall of the underground portion and the soil cement column continuous wall are tightened to each other, and the side wall and the soil cement column continuous wall are connected to each other. C step of forming a load transmission mechanism by friction force on the contact surface with the wall.

According to this aspect, in step B, the core material is formed by cutting the soil cement at the upper end of the continuous wall of soil cement column type continuous wall constructed in step A. Part of the first flange on the building side of the H-shaped steel is exposed, one end of the tension steel is fixed to the first flange via the first fixing body, and in the C process, the side wall of the underground part of the building is constructed. After fixing the other end of the tension steel to the side wall via the second anchorage, tension is introduced into the tendon, so that the contact surface between the side wall and the soil cement column continuous wall is subjected to a load due to frictional force. The transmission mechanism can be efficiently constructed, leading to efficient building construction.

As can be understood from the above description, according to the building and its construction method of the present invention, the side wall of the building is firmly connected to the continuous soil cement column wall constructed around the building. It is possible to provide a building and a building construction method capable of efficiently constructing the building.

FIG. 2 is a vertical cross-sectional view showing an example of a building according to an embodiment, and is a diagram for explaining step C of an example of a construction method for a building according to the embodiment. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1 and showing an example of a load transmission mechanism using a frictional force; FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2 and showing an example of a load transmission mechanism by bearing force of soil cement. It is a figure explaining the A process of an example of the construction method of the building which concerns on embodiment. It is a figure explaining B process of an example of the construction method of the building which concerns on embodiment.

A building and construction method thereof according to embodiments will be described below with reference to the accompanying drawings. In addition, in the present specification and drawings, substantially the same components may be denoted by the same reference numerals, thereby omitting duplicate descriptions.

[Building according to the embodiment]
First, an example of a building according to an embodiment will be described with reference to FIGS. 1 to 3. FIG. Here, FIG. 1 is a longitudinal sectional view showing an example of a building according to an embodiment, and FIG. 2 is a view taken along line II-II in FIG. 1, showing an example of a load transmission mechanism using frictional force. FIG. 3 is a cross-sectional view taken along the line III--III in FIG. 2, and is a cross-sectional view showing an example of a load transmission mechanism by bearing force of soil cement. In addition, FIG. 1 is also a diagram for explaining the C process of an example of the construction method for a building according to the embodiment, and is also applied to the construction method described in detail below.

The illustrated building 100 is constructed by connecting a side wall 15 of an underground part 11 of the building 10 in the ground G and a soil cement column type continuous wall 20 constructed around the building 10. It is For example, around the side wall 15 of the underground part 11 of the building 10 which is rectangular in plan view, a continuous wall 20 of soil cement column type having a rectangular frame shape in plan view is constructed and connected at a plurality of points. The building 10 has various shapes in plan view, and the continuous wall 20 of the soil cement column type is constructed in a frame shape corresponding to the plan view shape of the building 10 . Moreover, in FIG. 1, only a part of the side wall 15 and the bottom board 17 of the building 10 is extracted and illustrated.

The building 10 may be an RC structure, an S structure, an SRC (Steel Reinforced Concrete) structure, or a building with a hybrid structure of these. , various public buildings, etc. Hereinafter, in the illustrated example, at least the side wall 15 and the bottom slab 17 of the underground part 11 will be described as a building made of RC.

On the other hand, the soil cement columnar continuous wall 20 is formed by partially overlapping the circular soil cement 30 in plan view, and H-shaped steel is formed inside each circular soil cement 30 in plan view. A core material 40 is embedded. Here, as the core material, in addition to H-shaped steel, steel sheet piles, secondary concrete products, and the like may be applied.

The soil cement 30 is prepared by mixing and stirring earth and sand generated by excavating the ground G and cement milk discharged from the tip of a multi-shaft kneading auger machine (not shown) or the like. is constructed by inserting a core material 40 into the inside of the .

The illustrated example of the soil cement column type continuous wall 20 is a retaining wall when building 10 is constructed. , serves as the foundation of the building 10 .

The soil cement column type continuous wall 20 may be designed so that its tip reaches the hard ground where sufficient tip bearing force can be obtained, or the tip does not reach the hard ground but the soil cement column type continuous wall 20 It may be designed to support a vertical load by the peripheral frictional force between the peripheral surface of the continuous wall 20 and the ground G.

The H-shaped steel 40 embedded in the soil cement 30 has a first flange 42 on the building side, a second flange 43 on the side opposite to the building 10 and a web 41 .

As shown in detail in FIG. A second through hole 16 is formed at a position corresponding to the first through hole 45 .

A steel tension member 51 constituting a tendon 50 is inserted through the first through hole 45 and the second through hole 16 that communicate with each other. A first fixing body 52 and a second fixing body 53, which constitute the tension material 50 together with the tension steel material 51, are provided at both ends of the tension steel material 51, and the first fixing body 52 is the rear surface of the first flange 42 ( ), and the second fixing member 53 is fixed to the indoor-side surface of the side wall 15 . The tension steel material 51 is formed of PC steel materials such as PC (Prestressed Concrete) steel stranded wire, PC steel wire, and PC steel bar. A tension force is introduced.

By introducing a predetermined tension force to the tension steel material 51 , the side wall 15 of the underground part 11 and the core material 40 of the soil cement column type continuous wall 20 are mutually tightened via the tension material 50 . A load transmission mechanism 60 is formed by the frictional force between the first flange 42 and the side wall 15 on the contact surface 18 between the first flange 42 of the core member 40 and the RC side wall 15 .

A strong connection structure between the side wall 15 of the underground part 11 of the building 10 and the core material 40 of the soil cement column continuous wall 20 is formed by the load transmission mechanism 60 by the frictional force, and the soil cement column continuous wall 20 is formed. A base building 100 is formed.

As shown in FIG. 1, the vertical load N due to the weight of the building 10 or the like is transmitted to the core material 40 via the load transmission mechanism 60 due to frictional force, and is transmitted to the ground G via the soil cement column type continuous wall 20. be done. It should be noted that the indentation load during an earthquake or strong wind is also transmitted in the same manner.

Returning to FIG. 2, the contact surface 18 of the first flange 42 is provided with surface irregularities 19 . The surface unevenness 19 is a surface processed to a desired degree of roughness by various methods such as blasting.

The concrete forming the sidewall 15 enters the surface irregularities 19 of the first flange 42 and meshes with the surface irregularities 19 .

With this configuration, the frictional force on the contact surface 18 between the first flange 42 and the side wall 15 is further increased, and the load transmission performance (ability) of the load transmission mechanism 60 by the frictional force is improved.

According to the load transmission mechanism 60 by frictional force, the soil cement column type continuous wall 20 and the entire side wall 15 of the building 10 (total thickness of the side wall) can be tied together by the tendon 50, so that the thickness of the side wall A building 100 with significantly high connection strength is formed as compared with a connection structure using a stud dowel or the like in which only a part of the connection is buried.

Furthermore, since it is not necessary to weld a large number of stud dowels or the like to the core material at the site in order to obtain a certain connection strength, there is no problem of labor at the site.

Further, as shown in FIGS. 1 and 3, a plurality of (three in the illustrated example) third through-holes 47 are formed in the web 41 constituting the core material 40, and the third through-holes 47 are filled with soil. A load transmission mechanism 70 is formed by the bearing force of the soil cement due to the intrusion of the cement.

Here, the hole diameter and number of the third through holes 47 are set so as to obtain a desired bearing force of the soil cement. Although the third through-holes 47 in the illustrated example are centrally formed below the web 41, they may be formed evenly throughout the web 41, and the first flange 42 and the second flange 43 may be formed evenly. may be opened in

The vertical load N transmitted to the core material 40 via the load transmission mechanism 60 based on frictional force can be effectively transmitted to the soil cement 30 by the load transmission mechanism 70 based on the bearing force of the soil cement. The vertical load N can be transmitted to the surrounding ground G, the hard ground at the tip, etc.

According to the load transmission mechanism 70 based on the bearing force of the soil cement, the soil cement automatically enters the third through-hole 47 and hardens due to the structure in which the third through-hole 47 is machined at the proper place of the core material 40 . Therefore, it is possible to form a mechanism with excellent load transmission performance with simple processing and configuration.

Although illustration is omitted, a stud dowel may be attached to the core material, and a load transmission mechanism may be formed by shearing force and/or bearing force of the stud dowel embedded in the soil cement. Moreover, the structure may be provided with both the load transmission mechanism 70 based on the bearing force of the soil cement in the illustrated example and the load transmission mechanism based on the shear force and/or bearing force of the stud dowel.

[Building construction method according to the embodiment]
Next, an example of a method for constructing a building according to the embodiment will be described with reference to FIGS. 4 and 5 and FIG. Here, FIGS. 4 and 5 are diagrams respectively explaining the A process and the B process of an example of the construction method of the building according to the embodiment. Further, as already described, FIG. 1 is a vertical cross-sectional view showing an example of a building according to an embodiment, and is a diagram for explaining step C of an example of a construction method for a building according to an embodiment. be.

In the building construction method, first, as shown in FIG. 4, prior to the construction of the building, a soil-cement row-type continuous wall having a rectangular frame shape in a plan view, for example, is installed as an earth retaining wall around the construction area of the building. 20 is constructed.

A known SMW (Soil Mixing Wall) construction method or the like can be applied to the construction method of the soil cement column row type continuous wall 20, starting with removal of underground obstacles, installing a guide wall (not shown), and applying soil cement. After blending, the designed cement slurry is discharged from the tip of the auger head of a multi-screw kneading auger, etc., and drilled and mixed. After reaching a predetermined depth, the auger head is pulled up while performing repeated mixing to obtain soil. Cement 30 is created. Then, the core material 40 is inserted into the soil cement 30 before the soil cement 30 hardens. In addition, as a wall building procedure, the first element is constructed, then the second element is constructed at intervals, and then the holes at both ends of the third element are formed. A continuous method in which the holes of each element are formed while being lapped, or a plurality of holes are pre-drilled at intervals at positions where the holes of each element follow, and then the holes of each element are pre-drilled holes It is possible to apply a combination method of pre-drilling in which each element is formed by lapping it (above, A process).

Next, as shown in FIG. 5, the soil cement 30 at the upper end of the soil cement columnar continuous wall 20 on the building side is cut to expose a portion of the first flange 42 .

Next, a first through-hole 45 is opened at a predetermined position of the exposed first flange 42, one end of the tension steel member 51 is passed through the first through-hole 45, and a first fixing body 52 is installed on the back surface of the first flange 42. One end of the tension steel 51 is secured to the first flange 42 by connecting one end of the tension steel 51 to the . Here, the first through hole 45 may be formed in advance at a predetermined position of the first flange 42 (above, step B).

Next, as shown in FIG. 1, the side wall 15 of the underground portion 11 of the building 10 that abuts at least the first flange 42 is constructed, and the other end of the tension steel material 51 is passed through the second through hole 16 of the side wall 15. , the other end of the tension steel member 51 is connected to a second fixing member 53 installed on the inner side of the side wall 15 .

Next, by introducing a predetermined tension force to the tendon 50 (post-tension method), the side wall 15 of the underground section 11 and the soil cement column continuous wall 20 are tied together, and the side wall 15 and the soil cement column are tied together. The building 100 is constructed by forming the load transmission mechanism 60 by frictional force on the contact surface 18 of the core member 40 of the row-type continuous wall 20 (above, step C).

According to the construction method of the illustrated example, in step B, one end of the tendon 50 is fixed to the soil cement column continuous wall 20, and in step C, the side wall 15 is constructed and the other end of the tendon 50 is fixed. By introducing tension force to the tendon 50 and constructing the load transmission mechanism 60 by friction force, the side wall 15 of the underground part 11 of the building 10 and the core material 40 of the soil cement column type continuous wall 20 are strengthened. The connected building 100 can be efficiently constructed.

Other embodiments may be possible in which other constituent elements are combined with the configurations described in the above embodiments, and the present invention is not limited to the configurations shown here. Regarding this point, it is possible to change without departing from the gist of the present invention, and it can be determined appropriately according to the application form.

10: Building 11: Underground part 15: Side wall 16: Second through hole 17: Bottom slab 18: Contact surface 19: Surface unevenness 20: Soil cement column type continuous wall 30: Soil cement 40: Core material (H-beam)
41: Web 42: First Flange 43: Second Flange 45: First Through Hole 47: Third Through Hole 50: Tensile Material 51: Tensed Steel Material 52: First Fixing Body 53: Second Fixing Body 60: By Friction Force Load transmission mechanism 70: Load transmission mechanism by bearing force of soil cement 100: Building G: Ground N: Vertical load

Claims (6)

A building in which a side wall of an underground portion provided in the ground and provided in the building is connected to a soil cement column series continuous wall provided around the building,
wherein the side wall of the underground section and the continuous soil cement columned wall are tied together by tendons into which tension is introduced;
A building characterized in that a load transmission mechanism based on a frictional force is formed on a contact surface between the side wall and the soil cement column continuous wall. said prestressing tendons comprising a prestressing steel and first and second anchorages at opposite ends of said prestressing steel;
The soil cement column type continuous wall has a core material embedded inside the soil cement,
The core member is formed of H-beam steel comprising a first flange on the building side, a second flange on the side opposite to the building, and a web,
a first through-hole and a second through-hole through which the tension steel passes are formed at corresponding positions of the first flange and the side wall, respectively;
One end of the steel tension extending through the corresponding first and second through holes is fixed to the first flange via the first fixing body, and the other end of the steel tension is fixed to the first flange. 2. The building according to claim 1, wherein the building is fixed to the side wall via two fixing bodies. A third through hole is formed in the core material,
3. The building according to claim 2, wherein soil cement enters said third through-hole, and a load transmission mechanism is formed by bearing force of said soil cement. A stud dowel is attached to the core material,
4. The building according to claim 2, wherein a load transmission mechanism is formed by shear force and/or bearing force of said stud dowel embedded inside said soil cement. The contact surface of the first flange is provided with surface irregularities,
5. A building as claimed in any one of claims 2 to 4, characterized in that the side walls are made of reinforced concrete, and the concrete meshes with the surface irregularities. The side wall of the basement of the building in the ground and the continuous wall of the soil cement column type provided around the building are composed of tension steel, first anchorages at both ends of the tension steel, and A method of constructing a building connected by a tendon comprising a second anchorage, comprising:
An H-shape comprising soil cement and a core embedded in the soil cement, the core comprising a first flange on the building side, a second flange on the opposite side of the building, and a web. A step of constructing a continuous wall with soil cement columns made of steel;
cutting the soil cement at the upper end of the soil cement column continuous wall to expose a portion of the first flange;
one end of the tension steel is passed through a first through hole formed in the first flange, and one end of the tension steel is fixed to the first fixing body installed on the back surface of the first flange; B step;
In the building, the side wall is constructed to contact at least the first flange, the other end of the tension steel is passed through the side wall, and the tension steel is attached to the second fixing body installed on the indoor side of the side wall. By fixing the other end and introducing a tension force to the tendon, the side wall of the underground portion and the soil cement column type continuous wall are tightened to each other, and the side wall and the soil cement column type continuous wall are tightened to each other. and C step of forming a load transmission mechanism by frictional force on a contact surface with a wall.

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