JP2010121368A - Method for constructing foundation structure for building, and the foundation structure for the building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for constructing a foundation structure for a building, and the foundation structure for the building, which can enhance the earthquake resistance and horizontal resistance of a viaduct, a bridge, etc., without greatly increasing dimensions of a column, a bridge pier or a foundation, or which can enhance the safety of traveling of a train in the case of a bridge for a railway. <P>SOLUTION: Soft ground 1 is improved like a wall; improved ground 2 is constructed in the ground so that a planar shape can be rectangular; subsequently, a pile 10 is constructed in the ground at the corner of the improved ground 2; and after that, an underground beam 11 is constructed on the improved ground 2 via the improved ground 2 and an anchor reinforcement 12 as a connecting member. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for constructing a foundation structure for a structure and a foundation structure for a structure, in particular, a pile is constructed in the ground at the corner of the improved ground so that the planar shape is rectangular in the ground. Concerning the construction method of the foundation structure for structures and the foundation structure for structures that can improve the seismic resistance of the structure and the horizontal resistance, etc. by integrating the underground beam and the improved ground constructed in It is.

  Conventionally, in order to improve the seismic resistance and horizontal resistance of viaducts and bridges, or in the case of railway bridges, the dimensions of columns, piers or foundations are increased in order to improve the safety of train travel. There was a way to do it.

  However, when constructing viaducts and bridges on soft ground, it cannot be handled unless the dimensions of columns, piers or foundations are significantly increased compared to good quality ground, and enormous construction costs are required. In addition, when there are restrictions on the construction location, the dimensions of the columns, piers, or foundations may not be the desired size.

  The object of the present invention is to improve the seismic resistance and horizontal resistance of viaducts and bridges without significantly increasing the dimensions of pillars, piers or foundations, or in the case of railway bridges, An object of the present invention is to provide a building foundation structure construction method and a building foundation structure capable of improving the safety of the building.

  The present invention has been made on the basis of the above findings, and is characterized by the following.

  In the invention according to claim 1, the ground is improved into a wall shape to construct an improved ground, then a pile is constructed in the ground at the end of the improved ground, and then the improved ground is formed on the improved ground. It is characterized by constructing a reinforcing member via the ground and a connecting member.

  The invention according to claim 2 is characterized in that, in the method for constructing a foundation for a structure according to claim 1, the reinforcing member is an underground beam or an underground slab.

  The invention according to claim 3 is characterized in that, in the method for constructing a foundation for a structure according to claim 1 or 2, the improved ground is constructed only on a soft ground layer.

  The invention according to claim 4 is characterized in that, in the method for constructing a foundation for a structure according to claim 1 or 2, the improved ground is constructed over the entire length of the pile.

  The invention according to claim 5 is characterized in that, in the construction method of a foundation structure for a structure according to any one of claims 1 to 4, the pile is constructed by a cast-in-place pile.

  The invention according to claim 6 is the method for constructing a foundation structure for a structure according to any one of claims 1 to 5, wherein the connecting member is a reinforcing bar that is dropped into the improved ground. It has characteristics.

  The invention according to claim 7 includes a wall-like improved ground constructed in the ground, a pile constructed in the ground at an end of the improved ground, and a reinforcing member constructed on the improved ground. The improved ground and the reinforcing member are connected by a connecting member.

  The invention according to claim 8 is characterized in that, in the foundation structure for structure according to claim 7, the reinforcing member is made of underground beams or underground slabs.

  The invention according to claim 9 is characterized in that, in the foundation structure for a structure according to claim 7 or 8, the improved ground is constructed only in a soft ground layer.

  The invention according to claim 10 is characterized in that in the foundation structure for a structure according to claim 7 or 8, the improved ground is constructed over the entire length of the pile.

  The invention according to claim 11 is characterized in that, in the foundation structure for a structure according to any one of claims 7 to 10, the pile is constructed by a cast-in-place pile.

  The invention according to claim 12 is characterized in that in the foundation structure for a structure according to any one of claims 7 to 11, the connecting member is made of a reinforcing bar dropped into the improved ground. It is what you have.

  According to the present invention, without significantly increasing the dimensions of columns, piers or foundations, it is possible to improve the seismic resistance and horizontal resistance of viaducts and bridges, or in the case of railway bridges, It is possible to improve the safety of the machine.

  One embodiment of the method for constructing a foundation structure for a structure of the present invention will be described with reference to the drawings.

  FIG. 1 is a plan view showing an improved ground constructed on the ground by the construction method of a foundation structure for a structure of the present invention, and FIG. 2 is a plan view of the improved ground constructed by the construction method of a foundation structure for a structure of the present invention. The top view which shows the state which built the pile in the corner, FIG. 3 is sectional drawing which shows the state which built the pile in the corner of the improved ground constructed | assembled by the construction method of the foundation structure for structures of this invention, FIG. Fig. 5 is a plan view showing a foundation structure for a structure according to the present invention, Fig. 5 is a sectional view showing the foundation structure for a structure according to the present invention, and Fig. 6 is an embodiment in which the improved ground and the pile are integrated by a reinforcing bar. It is sectional drawing which shows the foundation structure for structures. In addition, in the said top view, in order to distinguish with an improved ground, the stake was given to the pile. The same applies to the plan views shown below.

  In the construction method of the foundation structure for a structure of the present invention, first, as shown in FIG. 1, the improved ground 2 is constructed in a wall shape so that the planar shape is rectangular in the soft ground 1. The improved ground 2 is constructed by, for example, the Tenocolumn (registered trademark) method. The teno column method is a method in which a cement-based solidified material is liquefied and poured into the soft ground 1, and the soft ground 1 and the solidified material liquid are agitated and mixed. To build.

  Hereinafter, the teno column method will be further described with reference to the drawings.

  FIG. 12 is a schematic diagram showing equipment for carrying out the teno column method.

  As shown in FIG. 12, the teno-column construction equipment includes a plant-side equipment including a water tank 3, a cement silo 4, a mixing plant 5 and a pump 6, and a construction machine-side equipment including a construction machine body 7 and a stirring device 8. The ground is improved as follows.

  Water and cement are respectively sent from the water tank 3 and the cement silo 4 to the mixing plant 5, where water and cement are mixed to prepare a cement slurry. The cement slurry thus prepared is sent to the construction machine main body 7 by the pump 6. The cement slurry sent to the construction machine main body 7 is sent to a stirring device 8 having a stirring blade 9 attached to the tip. The stirring device 8 stirs the soft ground 1 to a predetermined depth by the stirring blade 9 while injecting cement slurry into the soft ground 1. As a result, the stirring blade 9 passes and the stirred columnar ground portion is in a state where the soft ground and the cement slurry are mixed. Then, if the stirring blade 9 is pulled up and the cement is solidified, a cylindrical improved ground 2 is constructed in the soft ground 1. If such an operation is repeated by shifting the construction position, the improved ground 2 can be constructed in a wall shape so that the planar shape is rectangular as shown in FIG.

  Next, the pile 10 is constructed | assembled in the corner part (edge part) (C) of the improved ground 2 constructed | assembled so that a planar shape might become a rectangular shape. The pile 10 may be a normal driven pile, but a cast-in-place pile in which a pile diameter and a pile length can be freely selected and a pile having a large diameter and a large depth is possible is preferable. The cast-in-place pile method includes an earth drill method, an all casing method, a reverse method, and the like, and the pile 10 may be constructed by any method.

  For example, in the earth drill method, the ground is excavated to the planned depth of installation of the casing, the casing is installed in the excavation hole, and further excavated while injecting a stable liquid suitable for the soil into the excavation hole, and then excavated to the planned depth. , Reinforcing rods assembled on the ground are inserted into the excavation hole, and concrete is cast into the excavation hole and solidified, and it has low vibration and low noise. Moreover, it has the advantage that it can be constructed even in a narrow site.

  Next, as shown in FIGS. 4 and 5, the underground beam 11 is constructed as a reinforcing member on the improved ground 2. The underground beam 11 and the improved ground 2 are integrated via a connecting member. The reinforcing member may be an underground slab (flat concrete) other than the underground beam 11 (see FIG. 11). The connecting member may be a reinforcing bar bar 13 as shown in FIG. 6 in addition to the anchor reinforcing bar 12 and the like. The reinforcing bar 13 is dropped into the improved ground 2 before the cement slurry is hardened during the construction of the improved ground 2. As shown in FIG. 6, the underground beam 11 and the cast-in-place pile 10 may be integrated by the reinforcing bar 14. In this case, since the reinforcing bar 14 is originally inserted into the excavation hole, the upper part of the reinforcing bar 14 is extended and integrated with the underground beam 11.

  The above is the case where the improved ground 2 is constructed so that the planar shape is rectangular, and the pile 10 is constructed at the corner, but as shown in FIG. 7, the improved ground 2 is constructed in a row, Even if the piles 10 are constructed at both ends, as shown in FIG. 8, the improved ground 2 is constructed in the shape of a rice field, and the piles 10 are constructed at the four corners thereof, as shown in FIG. Even if the pile 10 is constructed at the intersection of the improved ground 2, or the improved ground is constructed diagonally within the rectangular improved ground 2, as shown in FIG. The piles 10 may be constructed at the four corners of the rectangular improved ground 2. FIG. 11 shows a case where the underground slab 15 is constructed on the improved ground 2 whose planar shape shown in FIG. 8 is rectangular.

  As described above, according to the present invention, the improved ground is formed between the piles, the underground beam is constructed on the improved ground, and the underground beam and the improved ground or the improved ground and the pile are connected via the connecting member. Therefore, without significantly increasing the dimensions of pillars, piers or foundations, it is possible to improve the seismic resistance and horizontal resistance of viaducts and bridges, or in the case of railway bridges, the safety of train running Can be improved.

It is a top view which shows the improved ground constructed | assembled in the ground by the construction method of the foundation structure for structures of this invention. It is a top view which shows the state which built the pile in the corner of the improved ground constructed | assembled by the construction method of the foundation structure for structures of this invention. It is sectional drawing which shows the state which built the pile in the corner part of the improved ground constructed | assembled by the construction method of the foundation structure for structures of this invention. It is a top view which shows the basic structure for structures of this invention. It is sectional drawing which shows the basic structure for structures of this invention. It is sectional drawing which shows the foundation structure for structures of this invention with which the improved ground and the pile were integrated by the reinforcing bar. It is a top view which shows the example which constructed | assembled the improved ground in a line and constructed the pile in the both ends. It is a top view which shows the example which constructed | assembled the improved ground in the shape of a rice field and built the pile in the four corners. It is a top view which shows the example which constructed | assembled the improved ground in the shape of a rice field and built the pile in the crossing part of improved ground. It is a top view which shows the example which constructed | assembled the improved ground diagonally in the rectangular improved ground, and built the pile in the four corners of the rectangular improved ground. It is a top view which shows the example which built the underground slab on the improved ground whose planar shape is a rectangular shape. It is the schematic which shows the implementation equipment of a teno column construction method.

Explanation of symbols

1: Soft ground 2: Improved ground 3: Water tank 4: Cement silo 5: Mixing plant 6: Pump 7: Construction machine body 8: Stirring device 9: Stirring blade 10: Pile 11: Underground beam 12: Anchor rebar 13: Rebar籠 14: Rebar 籠 15: Ground slab

Claims (12)

  An improved ground is constructed by improving the ground into a wall shape, then a pile is constructed in the ground at the end of the improved ground, and then a reinforcing member on the improved ground via the improved ground and a connecting member A construction method of a foundation structure for a structure, characterized in that   The construction method of a foundation structure for a structure according to claim 1, wherein the reinforcing member is an underground beam or an underground slab.   The construction method of a foundation structure for a structure according to claim 1 or 2, wherein the improved ground is constructed only in a soft ground layer.   The construction method of a foundation structure for a structure according to claim 1, wherein the improved ground is constructed over the entire length of the pile.   The method for constructing a foundation structure for a building according to any one of claims 1 to 4, wherein the pile is constructed by a cast-in-place pile.   The construction method of a foundation structure for a structure according to any one of claims 1 to 5, wherein the connecting member is a reinforcing bar dropped into the improved ground.   A wall-like improved ground constructed in the ground, a pile constructed in the ground at the end of the improved ground, and a reinforcing member constructed on the improved ground, the improved ground and the reinforcing member Is a foundation structure for a structure characterized by being connected by a connecting member.   The foundation structure for a structure according to claim 7, wherein the reinforcing member is made of underground beams or underground slabs.   The foundation structure for a structure according to claim 7 or 8, wherein the improved ground is constructed only in a soft ground layer.   The foundation structure for a structure according to claim 7 or 8, wherein the improved ground is constructed over the entire length of the pile.   The said pile is constructed | assembled by the cast-in-place pile, The foundation structure for structures as described in any one of Claim 7 to 10 characterized by the above-mentioned.   The foundation structure for a structure according to any one of claims 7 to 11, wherein the connecting member is made of a reinforcing bar dropped into the improved ground.

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