JP2566050B2 - How to construct a vertical structure below an existing building - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for constructing a vertical structure such as an underground multistory parking lot below an existing building, and particularly to a well pipe member made of precast concrete, an iron plate, or the like. It relates to a method of sunk in the ground while pressing down with a jack.

《Conventional technology》 In the method of constructing a vertical hole-like structure in which a well member is submerged in the ground like the caisson method, the well member is sunk by its own weight while excavating the inside and bottom ground of the well member, but at the depth As the soil pressure increases, the earth pressure and resistance acting on the well pipe member increase, making it difficult to smoothly bury the well pipe member. Therefore, as disclosed in Japanese Examined Patent Publication No. 50-6086, in parallel with excavating the inside and the bottom of the well member, the well member is uniformly pressed from above with a jack, and the well member is pressed by the pressing force. I try to push it downward.

<Problems to be Solved by the Invention> In the method of Japanese Patent Publication No. 50-6086, the pipe serving as a guide for the well member is driven into the ground and fixed before the well member is sunk, and the well member is moved downward. The fixed pipe was used as the fulcrum of the jack for pressing. A plurality of the fixed pipes must be provided along the inner circumference of the well member, and a troublesome preliminary work of driving the plurality of pipes into the ground in a predetermined arrangement to fix the pipes is indispensable.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to make a vertical hole below an existing building that does not require a special new fixing member that serves as a fulcrum of a jack for pressing the well member downward. The object is to provide a method for constructing a structure-like structure.

<< Means for Solving the Problem >> Therefore, in the invention according to claim 1, the reaction force is applied to the skeleton of the existing building, and the well cylinder member made of precast concrete or iron plate is pushed downward by the jack to the ground. I decided to lay it down.

Further, in the invention according to claim 2, the well cylinder member is formed by dividing a vertical hole-shaped structure to be finally constructed into a plurality of pieces in the height direction, and the well cylinder member to be laid at the bottom is provided by the jack to the existing building. After pushing down the frame by applying a reaction force to the frame of the above, the jack is contracted, a new tube member is stacked on the sunk tube member, and the jack is used to apply a reaction force to the frame of the existing building It was decided to press the member downward.

<< Operation >> The solid structure of the existing building serves as a fulcrum of the jack, and the reaction force when pressing the well pipe member with the jack is obtained from the structure of the existing building.

<< Embodiment >> FIG. 1 shows an embodiment of the present invention, in which the present invention is applied to construct a vertical hole-like structure when a multistory parking lot is added to an underground portion of an existing building.

In the figure, 1 is a frame of an existing building, 2 is a square frame-shaped iron plate well member being sequentially sunk, 3 is the ground, and 4 is a plurality of jacks for pushing the well member 2 downward to propel it. Is.

A well having a suitable depth corresponding to the shape of the well cylinder member 2 is drilled in the ground 3 in the underground portion of the existing building 1 in which the well cylinder member 2 is to be sunk, and the well cylinder members 2 divided into appropriate depths are drilled there. After setting, a plurality of jacks 4 are attached between the upper edge of the well member 2 and the frame 1 of the existing building, and the well member 2 is strongly pressed downward by the jack 4.

The pressing force by the jack 4 and the appropriate excavation of the ground 3 are performed alternately or in parallel to embed the well member 2 in the ground 3. When the well member 2 is sunk to some extent and the jack 4 is fully extended, the jack 4 is contracted, the next well member 2 is stacked on the already sunk well member 2, and the well member 2 is again lowered by the jack 4. Press to push in the direction of sinking. Such well cylinder members 2 are sequentially stacked, and the operation of jacking 4 and the work of digging the inner and lower portions of the well cylinder member 2 are repeated to create a vertical hole-shaped space having a predetermined depth. To construct the structure of the underground multi-storey car park.

<Effects of the Invention> As described in detail above, in the method of the present invention, the reaction force of the propulsion force by the jack when the well member is sunk in the ground is applied to the skeleton of the existing building. As described above, the lower part of an existing building can be effectively used as, for example, an underground multi-storey parking lot without requiring the troublesome work of previously installing a fixed pipe (anchor) to be a fulcrum of a jack.

[Brief description of drawings]

FIG. 1 is a schematic view of an embodiment to which the present invention is applied when constructing a vertical structure such as an underground multistory parking lot under an existing building. 1 …… Skeletal structure of existing building 2 …… Izutsu member 3 …… Ground 4 …… Jack

Claims (2)

(57) [Claims] 1. A vertical hole structure below an existing building, characterized in that a reaction force is applied to a frame of the existing building and the well-barrel member made of precast concrete, an iron plate or the like is pushed downward by a jack and is sunk in the ground. How to build things. 2. The well-barrel member is formed by dividing a vertically structured structure to be finally constructed into a plurality of parts in the height direction, and the well-barrel member to be laid at the lowermost portion is reacted by the jack against a frame of an existing building. After pressing and pressing downward, shrink the jack,
2. A new well pipe member is stacked on the well pipe member that has been sunk, and then the jack is used to apply a reaction force to the frame of the existing building to press the well pipe member downward.
A method of constructing a vertical structure below the existing building described in.