JP4877251B2 - Construction method of underground concrete structure and underground concrete structure - Google Patents

Description

  The present invention relates to a wall-shaped underground concrete structure such as a cast-in-place concrete pile or an underground wall.

  In recent years, with the increase in height and weight of buildings, the pulling force and pushing force applied to the foundation piles of buildings during earthquakes and the like have also increased. For this reason, it is necessary to drive the pile long to a hard ground deeper than the support layer so that the foundation pile can resist such a large pulling force / push-in force. Invited.

  On the other hand, for example, Patent Document 1 discloses a cast-in-place concrete pile with a rib. According to such a concrete pile with ribs, a large resistance force can be obtained with respect to the drawing force / pushing force because the rib resists the drawing force / pushing force acting on the pile. As a result, the length of the pile required to obtain the necessary resistance can be shortened, leading to a shortened construction period and reduced construction costs.

  However, the concrete pile disclosed in Patent Document 1 is a cylindrical pile. In the case of this cylindrical pile, there is a restriction that the interval between the piles must be greater than a certain interval, and the degree of freedom in design is small. On the other hand, a wall pile has the merit that the degree of freedom in design is larger than that of a cylindrical pile, such that the width and thickness can be set as appropriate.

Patent Document 2 discloses a cast-in-place concrete pile in which ribs are provided on such a wall pile. In the cast-in-place concrete pile disclosed in the same document, the excavation hole is drilled using a bucket, and at that time, the bucket is greatly opened at the construction depth of the rib to form a dowel in the excavation hole. Ribs are formed.
Japanese Patent Laid-Open No. 11-336457 JP 63-75218 A

  As described above, in the cast-in-place concrete pile disclosed in Patent Document 2, ribs are formed by largely opening the bucket during drilling. For this reason, a rib can be provided only in the both ends of a wall pile, and the freedom degree of arrangement | positioning of a rib is small. In addition, the rib provided on the end face of the wall pile cannot increase the resistance to the horizontal force in the in-plane direction.

The present invention has been made in view of the above points, and the construction of a wall-like underground concrete structure capable of exerting a great resistance to an in-plane horizontal force by providing out-of-plane ribs. and to provide a method and underground concrete structure built in this way.

To achieve the above object, the present invention provides a wall-like body, protrude both out-of-plane direction or out-of-plane direction and the in-plane direction in some of the wall-like member in the height direction of the wall-like member a method of constructing an underground concrete structure comprising a plurality of re blanking, a plurality of pile-like borehole having拡底portion by ground drill method was drilled in the ground, between the plurality of piles shaped borehole By excavating the ground into a wall shape, the widened portion protrudes from the wall-shaped excavation part in an out-of-plane direction or both in an out-of-plane direction and an in-plane direction in a part of the depth direction of the excavation part. a boring step of boring a borehole integral formed by connecting, by inserting the reinforcing bars or steel saw including a pouring step of pouring concrete into the borehole, projecting the拡底portion from said drilling portion configuring the ribs by Da設concrete into portions And features.

Further, the present invention includes a wall-like body, and a plurality of re blanking projecting both out-of-plane direction or out-of-plane direction and the in-plane direction in some of the wall-like member in the height direction of the wall-like member A method for constructing an underground concrete structure comprising: after excavating a wall-shaped excavation hole in the ground, connecting a plurality of pile-shaped excavation holes having an expanded bottom portion to the wall-shaped excavation hole by an earth drill method. And a drilling step for excavating the bottomed portion so as to protrude from the wall-shaped excavation part in a part of the depth direction of the excavation part in an out-of-plane direction or in both an out-of-plane direction and an in-plane direction; drilling holes drilled in the drilling step by inserting the reinforcing bars or steel saw including a pouring step of pouring the concrete, the ribs by concrete the拡底portion is Da設the portion projecting from the drilling portion and said that you configure.

Further, by drilling more piles shaped borehole to A Sudoriru construction method, only removes ground between the borehole was drilled at a low earth drill method of construction costs, since the excavation is completed, shortening the construction period In addition, the construction cost can be reduced.

  The “underground concrete structure” in the present invention is a concept including a reinforced concrete structure, a steel-framed concrete structure, and a steel-framed reinforced concrete structure.

  According to the present invention, by providing ribs in the out-of-plane direction or in both the out-of-plane direction and the in-plane direction in a wall-shaped underground concrete structure such as a wall pile or underground wall, It can effectively resist the horizontal force. Moreover, since such an underground concrete structure can be constructed | assembled with the combination of a pile provided with an expanded bottom part, and a wall-like body, while being able to hold down construction cost, a construction period can also be shortened.

  FIG. 1 is a front view of a concrete pile 10 according to an embodiment of the present invention, and FIG. 2 is a plan view of the concrete pile 10. As shown in these drawings, the concrete pile 10 has a configuration in which two cylindrical bodies 12 are connected by a wall-like body 14. The cylindrical body 12 has an expanded bottom portion 16 at its lower end. The expanded bottom portion 16 is configured to gradually expand in diameter downward. However, the expanded bottom portion 16 may be configured as a columnar portion with an expanded diameter. The diameter of the expanded bottom portion 16 is larger than the thickness of the wall-like body 14. Therefore, the widened portion 16 protrudes from the wall-like body 14 in the thickness direction (out-of-plane direction) and in the width direction (in-plane direction) to form a rib 18.

  According to such a configuration, the rib 18 resists the pulling force and the pushing force acting on the concrete pile 10, so that a large resistance force can be obtained with respect to the drawing force and the pushing force. Therefore, the length of the concrete pile 10 for obtaining the necessary resistance force against the indentation force and the pulling force can be shortened, so that the pile placement depth on the hard ground, which is particularly troublesome, is required. The construction period can be shortened and the construction cost can be reduced. For example, it is not necessary to drive the pile to the hard ground.

  Moreover, since the rib 18 is provided so as to protrude in the out-of-plane direction of the concrete pile 10, a large resistance force can be expected even with respect to the horizontal force in the in-plane direction acting on the concrete pile 10. In other words, in the case of a normal wall pile having no ribs in the out-of-plane direction, the horizontal force in the in-plane direction can only resist the thickness area. On the other hand, in the case of the concrete pile 10, by resisting with the rib 18 with respect to the horizontal force in the in-plane direction, a large resistance force can be exhibited.

  Moreover, since the concrete pile 10 of this embodiment has the structure which connected the cylindrical body 12 and the wall-shaped body 14, it can be constructed only by applying the construction method of a conventional cylindrical pile and a wall pile, and special. Since it is not necessary to use a simple machine, the construction period can be shortened and the construction cost can be reduced.

  FIG. 3 is a cross-sectional view showing a configuration in which the concrete pile 10 is constructed as a foundation pile of the building 30. When an earthquake occurs, a large pushing force and a pulling force act alternately on the concrete pile 10 due to the shaking of the building 30 as indicated by arrows in the figure. As described above, according to the concrete pile 10, since the rib 18 is provided, a large resistance force can be obtained with respect to the pushing force / withdrawing force, so that it is necessary to resist the pushing force / withdrawing force accompanying the earthquake. The length of the concrete pile 10 can be shortened, and a large resistance can be exerted against a horizontal force. For this reason, the length of the concrete pile 10 can be suppressed even when the building 30 is increased in height and weight, and a large pushing force, pulling force, or horizontal force acts on the foundation pile. Can be avoided.

  In FIG. 4, the concrete pile 10 is constructed as a pile that supports the steel column 40 provided in the underground construction part in the reverse driving method, and after the building is completed, the concrete pile 10 is used as a foundation pile of the building. FIG. Also in this example, although the weight of the ground building part 42 acts on the concrete pile 10 via the steel column 40 as an indentation force, the concrete pile 10 exhibits a large resistance to the indentation force as described above. Therefore, the length of the concrete pile 10 required to support the building weight can be shortened.

5-7 is a figure for demonstrating the construction procedure of the concrete pile 10. FIG. First, as shown in FIG. 5, after drilling the two excavation holes 20 by the earth drill method, the expansion hole portion 22 is excavated by the expansion bucket 50 (FIG. 5 shows the drilling of the left excavation hole 20). And the bottomed hole portion 22 of the right excavation hole is excavated) . Na us, for excavation process configuration and拡底hole 22 of拡底bucket 50, for example, reference to JP 62-10392 Publication.

  Next, as shown in FIG. 6, the ground between the excavation holes 20 is excavated into a rectangular shape by, for example, a hydrophrase excavator 52 (or a bucket excavator or other appropriate excavator), and then a concrete pile. It is set as the integral excavation hole 24 for constructing 10. Then, as shown in FIG. 7, after inserting the reinforcing bar 26 into the excavation hole 24, the concrete pile 10 is constructed by placing concrete using the tremy pipe 28. Note that the steel pile 10 may be made of a steel-concrete structure by inserting a steel frame into the excavation hole 24, or may be a steel-frame reinforced concrete structure by inserting both a reinforcing bar and a steel frame.

  According to the above process, after the drilling hole 20 is drilled by the earth drill method with a low construction cost, the drilling hole 24 can be drilled only by excavating only the ground between them with the hydrophrase excavator 52 or the like. For this reason, since the amount of excavation by the hydrophrase excavator 52 or the like is small, excavation work costs can be reduced. However, it is also possible to drill the circular hole by the earth drilling method after drilling the wall-shaped drilling hole first, and drill the concrete pile drilling hole 24. It is included in the scope of the invention.

  8 to 10 show various modifications of the concrete pile 10. In each figure, (a) shows a front view and (b) shows a plan view.

  The concrete pile 100 shown in FIG. 8 is provided with the expanded bottom portion 16 of the cylindrical body 12 in two stages. Note that the number of steps of the widened portion 16 is not limited to two and may be three or more.

  The concrete pile 200 shown in FIG. 9 is provided with the cylindrical body 12 not at both ends of the wall-like body 16 but at an intermediate portion. In the drawing, the configuration in which the bottom expanded portion 16 is provided in two stages is shown, but the bottom expanded section 16 may be one stage, or may be three or more stages. Moreover, although the structure which provided the two cylindrical bodies 12 is shown in the figure, you may provide not only this but one or three or more cylindrical bodies 12. FIG. Furthermore, as shown in FIG. 10, the structure which provides the cylindrical body 12 in one or more places of the both ends of the wall-shaped body 16 and an intermediate part may be sufficient.

  The construction of these concrete piles is also performed by excavation by the earth drill method and excavation by a hydrophrase excavator or the like, as in the process described with reference to FIGS. It can be performed in the process of placing concrete.

  FIG. 11 is a sectional view showing an embodiment when the present invention is applied to the underground wall 300, and FIG. 12 is a perspective view of the underground wall 300. In the present embodiment, ribs 302 that protrude in the out-of-plane direction are provided on the outer wall surface of the underground wall 300. As shown in the plan view of FIG. 13, the underground wall 300 is configured by a combination of a columnar body 306 having an expanded bottom portion 304 and a wall portion 308, as in the case of the concrete pile 10. The underground wall 300 functions as a retaining wall during underground construction, and also functions as an outer wall of the underground frame after the building 310 is completed. Therefore, as shown in FIG. 13, the wall thickness of the wall portion 308 is increased so that the rib 302 does not protrude on the inner wall surface side (upper side in FIG. 13) of the underground wall 300, and the center line and the cylindrical body 306 The center is shifted in the out-of-plane direction.

  When the building 310 is shaken due to an earthquake, the largest pulling force / pushing force acts on the outer wall portion of the underground frame. In this embodiment, the rib 302 is provided on the outer wall portion, and the pulling due to the earthquake is performed. It can effectively resist the force / pushing force.

  In addition, in this embodiment, as shown with a broken line in FIG. 11, it can also be made to function as a pile by driving the underground wall 300 deeper than a housing.

  In addition, the underground wall 300 is not limited to the case where the underground wall 300 is used as a main body as an outer wall or a pile of the underground frame, but the underground wall 300 is constructed as a temporary wall, and the underground wall 300 and the frame of the building 310 are connected by a connecting metal fitting or the like The structure connected may be sufficient. Also in this structure, the force which acts on a housing at the time of an earthquake is transmitted to the underground wall 300 via a connection metal fitting, and the rib 302 can resist effectively this force.

  Further, as the shape of the underground wall 300, in addition to a rectangular frame-shaped wall as shown in FIG. 12, as shown in FIGS. 14 (a) to (c), an L-shape, a cross shape, a T-shape, etc. These can be used.

  Moreover, in each said embodiment, although the underground concrete structure provided with a rib shall be comprised by the combination of a cylindrical body and a wall-shaped body, it is not restricted to this, For example, as shown in FIG. An underground concrete structure may be configured by a combination of the pile 400 and the wall-shaped body 402, and such a configuration is also included in the scope of the present invention. In this case, the pile 400 can be constructed by drilling holes by, for example, a bucket method and placing concrete in the excavation holes.

It is a front view of a concrete pile which is one embodiment of the present invention. It is a top view of the concrete pile of this embodiment. It is sectional drawing which shows the structure by which the concrete pile of this embodiment was constructed | assembled as a foundation pile of a high-rise building. It is sectional drawing which shows the structure where the concrete pile of this embodiment was constructed | assembled as a pile which supports the steel column provided in the underground construction part in a reverse placement method. It is a figure (the 1) for demonstrating the construction procedure of the concrete pile of this embodiment. It is FIG. (2) for demonstrating the construction procedure of the concrete pile of this embodiment. It is a figure (the 3) for demonstrating the construction procedure of the concrete pile of this embodiment. It is a figure which shows the modification of the concrete of this embodiment. It is a figure which shows another modification of the concrete of this embodiment. It is a figure which shows another modification of the concrete of this embodiment. It is sectional drawing which shows embodiment when this invention is applied to an underground wall. It is a perspective view of the underground wall of this embodiment. It is a top view of the underground wall of this embodiment. 14 (a) to 14 (c) are plan views showing various shapes of underground walls to which the present invention can be applied. It is a perspective view which shows another embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,100,200 Concrete pile 12 Cylindrical body 14 Wall-shaped body 16 Expanded bottom part 18 Rib 20 Excavation hole 22 Expanded hole part 24 Excavation hole 300 Underground wall 302 Rib 304 Expanded bottom part 306 Cylindrical body 308 Wall part 310 Building 400 Pile 402 Wall Body

Claims (5)

A wall-like body, the construction of underground concrete structure comprising a plurality of re blanking projecting both out-of-plane direction or out-of-plane direction and the in-plane direction in some of the wall-like member in the height direction of the wall-like member A method,
After excavating a plurality of pile-shaped excavation holes having an enlarged bottom portion in the ground by an earth drill method, excavating the ground between the plurality of pile-shaped excavation holes into a wall shape, the expanded base portion becomes the wall shape A drilling step of drilling a single excavation hole connected so as to protrude in an out-of-plane direction or in both an out-of-plane direction and an in-plane direction from a portion of the excavation portion in the depth direction of the excavation portion; a pouring step of pouring the concrete by inserting the reinforcing bars or steel in the borehole seen including,
A method for constructing an underground concrete structure, wherein the rib is formed of concrete cast in a portion where the expanded bottom portion protrudes from the excavation portion . A wall-like body, the construction of underground concrete structure comprising a plurality of re blanking projecting both out-of-plane direction or out-of-plane direction and the in-plane direction in some of the wall-like member in the height direction of the wall-like member A method,
After excavating the wall-shaped excavation hole in the ground, a plurality of pile-shaped excavation holes having an expanded bottom portion are connected to the wall-shaped excavation hole by an earth drill method, and the expanded bottom portion is the wall-shaped excavation portion. A drilling step for drilling from the excavation part so as to protrude in the out-of-plane direction or both in the out-of-plane direction and the in-plane direction at a part of the depth direction of the excavation part, or by inserting a steel frame only contains a pouring step of pouring the concrete,
A method for constructing an underground concrete structure, wherein the rib is formed of concrete cast in a portion where the expanded bottom portion protrudes from the excavation portion .   The underground concrete structure construction method according to claim 1 or 2, wherein the underground concrete structure is a cast-in-place concrete pile.   The method for constructing an underground concrete structure according to claim 1 or 2, wherein the underground concrete structure is an underground wall.   The underground concrete structure constructed | assembled by the construction method of the underground concrete structure of any one of Claims 1-4.

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