JP3205957U - Ground improvement body - Google Patents

Abstract

An object of the present invention is to provide a ground improvement body capable of shortening the operation to hold a structure built in a liquefied layer and having an excellent supporting force. A pile foundation 100 for improving the ground of a liquefied layer and a ground improvement wall that is provided between the pile foundation 100 and surrounds the liquefied layer. The head is provided with a plurality of slits 15, and the left and right ends of the ground improvement wall are inserted into the slits of the pile foundation 100. [Selection] Figure 1

Description

The present invention relates to a ground improvement body for improving a liquefied layer.

The foundation pile is used to fix the building to the ground, and is used to prevent the building from sinking due to vertical loads such as the building's own weight or earthquakes. On the other hand, underground walls may be used in order to prevent uneven settlement of buildings due to soil liquefaction.

JP-A-9-49239 JP 2007-277831 A JP2013-155570A JP 2014-31653 A

In order to increase the resistance against horizontal load, increasing the pile diameter is uneconomical because more materials are used for the pile foundation, and various inventions have been proposed.

Patent document 1 penetrates the support pile of a building to a support layer, builds a wall body in the outer peripheral part of a building, and penetrates this wall body to a deep part from a liquefied layer. The above-mentioned wall body shall be constructed by a deep mixing agitation method using cement hardener, and deformation of the supporting pile that will be the foundation of the building by suppressing the ground from flowing laterally due to liquefaction of the ground during an earthquake Is to prevent.

In Patent Document 2, a soil cement wall is constructed so as to surround the periphery of a building, and a core material is embedded from a steel frame member in the wall body. By such a soil cement wall, the ground in the surrounding area is firmly restrained and it is intended to suppress the liquefaction of the ground.

Patent document 3 forms a steel plate underground partition so as to surround a region where a building is constructed, and the steel plate underground partition is a plurality of steel plate members embedded in a predetermined dimension in the horizontal direction and a predetermined depth in the vertical direction. However, it is pressed into the ground so that adjacent steel plate members and side edges are connected to each other and have a shape in which the plan view of the wall surface is closed, and in the entire region surrounded by the steel plate underground partition wall, A steel shielding plate is laid almost horizontally at a predetermined depth.

In Patent Document 4, vertically long resistors that are embedded in the non-liquefied layer below the liquefied layer in the ground are arranged on the outer periphery of the existing structure so as to be arranged at intervals.

Each of the patent techniques has a problem of cost increase due to prolonged construction period. In particular, Patent Documents 1 and 2 require large-scale equipment, and Patent Document 4 has a problem that it cannot exhibit the maximum effect against uneven settlement because it is not completely surrounded by the underground wall.

In view of the above problems, the inventor has found a ground improvement body having excellent supporting force as a result of sincerity. A pile improvement wall provided with a plurality of slits in a pile head of a pile foundation buried in the ground, provided between the foundation piles and surrounding the liquefied layer, wherein both left and right ends of the ground improvement wall are the foundation It is a ground improvement body that is inserted into a pile slide.

Further, wire ropes are provided on the side surfaces of the left and right ends of the frame through the bottom bottom surface of the ground improvement wall or in the frame, and the strength is further increased by fixing both ends of the wire rope to the foundation pile. It is.

According to the present invention, not only the settlement on the buildings on the liquefied soil is suppressed, but the underground wall can be manufactured at the factory, so the workability at the site is good and the construction period can be shortened. Become.

The external view of the metal foundation pile of this invention is shown. The top view of the metal foundation pile of this invention is shown. The structure of the ground improvement wall which is this invention is shown. The top view of the ground improvement wall which is this invention is shown. The top view in the state where the ground improvement wall was inserted in the slit of the foundation pile is shown. The another Example of the ground improvement wall of this invention is shown. The top view in the state where the ground improvement wall shown in Drawing 6 was inserted in the metal foundation pile provided with four slits is shown. An example at the time of embedding the pile foundation and ground improvement wall of this invention in a liquefaction layer is shown. An example of embedding the foundation pile and ground improvement wall of the present invention in a liquefied layer in a grid pattern is shown. The ground improvement wall used when a liquefied layer exists from the soil surface to a deep position is shown. The state which inserted the ground improvement wall of FIG. 10 in the pile foundation is shown. The structure of the ground improvement wall with a wire rope is shown. The method of fixing the ground improvement wall and pile foundation with wire rope is shown.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows the external appearance of a pile foundation (100) which is an embodiment of the present invention. The said pile foundation is a metal pipe body (10), and is provided with two slits (15) in the longitudinal direction. FIG. 2 is a top view of the pile foundation, where the slit has a width d and the slit (15) is provided at a facing position.

A structural view and a top view of the ground improvement wall (200) of the present invention are shown in FIGS. The ground improvement wall has a rectangular structure composed of a vertical frame (20) using H steel and a metal horizontal frame (30), and a metal brace (40) is attached in the frame. Further, a metal wire (50) is stretched around the frame of the ground improvement wall, and a wall (60) using concrete is formed in the frame.

The top view after connecting the pile foundation (100) and ground improvement wall (200) which are this invention is shown in FIG. The connecting method is completed by inserting the vertical frame (20) made of the H steel into the slit (15) region of the metal pipe (10).

It is shown in FIG. 6 observed from the upper surface of another ground improvement wall (201) using a single pipe (70) instead of the vertical frame (20) using the H steel. FIG. 7: shows the top view after connecting the ground improvement wall by the said single pipe (70) at the time of using the metal short pipe (11) provided with four slits (15) in the pile foundation.

FIG. 8: shows the figure from the upper surface made into an example at the time of embedding the pile foundation and ground improvement wall of this invention in a liquefaction layer. Foundation pile with metal short pipe (10) with two slits facing each other, foundation pile with metal short pipe (12) with two slits perpendicular to the center of the foundation pile and ground improvement What is necessary is just to connect so that a building may be enclosed by a wall (200).

FIG. 9 shows an example in which a pile foundation and a ground improvement wall can be embedded in a building site. The foundation pile and slit are made of a metal short pipe (10) provided in the direction in which the slits face each other. The metal short pipe (12) provided with two in the perpendicular direction from the center of the foundation pile, the metal short pipe (13) provided with three in the direction facing the slit and the vertical direction, and the ground improvement wall (200) It may be connected with.

The ground improvement wall (202) used when a liquefied layer exists from the soil surface to a deep position is shown in FIG. The bottom frame of the ground improvement wall (200) has a structure in which a steel frame plate (80) is attached. As shown in FIG. 11, the ground improvement wall (200) is inserted from the slit provided in the pile foundation (100), and has a length substantially equal to the frame plate (80) of the ground improvement wall (201). A metal ring (300) is inserted into the pile foundation (100). Further, the ground improvement wall (201) is inserted through the slit, and a metal cap (400) is inserted into the pile foundation (100). By inserting the metal ring (300) and the metal cap (400), the strength of the pile foundation provided with the slit can be secured.

FIG. 12 is a ground improvement wall (202) which is another embodiment of the present invention, and has a structure in which a single pipe (90) is attached to the lower frame of the ground improvement wall (201), and a metal wire ( 500) is arranged from the upper part of the single pipe (70) which is a vertical frame through the inside of the single pipe (90) to the other end of the single pipe (90). Furthermore, a metal ball (501) larger than the slit width is attached to the end of the metal wire (500) on the other end side of the single tube (90).

FIG. 13: inserts the said ground improvement wall (202) in the said pile foundation (100), and pulls up the said metal wire (500) from the upper part of the single pipe (70) which is a vertical frame. The state where a ball (501) is caught in the slit part of the foundation pile (100) is shown. Although not shown, the metal wire (500) is pulled up through the metal cap (300) provided with a hole, and the metal wire (500) is welded on the surface of the cap (300). By doing so, the said pile foundation (100) and the said ground improvement wall (202) can be fixed and maintained stably.

In addition, the specific structure of the ground improvement body concerning this invention is not restricted to what was described in embodiment, It can change in the range which does not deviate from the summary of invention. On the stage, it is possible to make a wall by attaching a metal plate instead of the metal wire in the frame of the ground improvement body (200), and if it is the metal wall, it is necessary to make a concrete wall Also disappear.

DESCRIPTION OF SYMBOLS 100 Pile foundation 10 Metal pipe body 11 Metal pipe body 12 Metal pipe body 15 Slit 20 Vertical frame 30 using H steel Metal horizontal frame 40 Metal braiding 50 Metal wire 60 Concrete Wall 70 using single tube 80 Steel frame plate 90 Single tube 100 Pile foundation 200 Ground improvement wall 201 Another ground improvement wall 202 Another ground improvement wall 300 Metal ring 400 Metal cap 500 Metal wire 501 Metal ball d Through hole diameter

Claims (5)

A foundation pile for improving the ground of the liquefied layer in order to maintain a structure built in the liquefied layer, and a ground improvement wall provided between the foundation pile and surrounding the liquefied layer, the pile of the foundation pile A ground improvement body in which a plurality of slits are provided on the head, and right and left ends of the ground improvement wall are inserted into the slits of the foundation pile. The ground improvement body according to claim 1, wherein left and right end portions of the ground improvement wall inserted into the slit of the foundation pile are larger than a slit width of the foundation pile. The ground improvement wall is made of a metal frame and braces, and the inner surface of the frame is covered with a metal support rod or wire rope, and the support rod or wire rope portion is made of cement with a wall structure. The ground improvement body of Claim 1 currently used. The ground improvement body according to claim 1, wherein the ground improvement wall is made of a metal frame, and an inner surface of the frame has a wall structure by a metal plate. The ground improvement body of Claim 1 by which the wire rope is comprised in the left-right both-ends frame side surface or frame via the lower frame side surface of the said ground improvement wall.

Images