JPS6393931A - Settlement of structure - Google Patents

Abstract

PURPOSE:To exactly and vertically settle a structure by adjusting the contracting speed of a jack on the inclined side when lowering the structure by contracting jacks attached to the lower end of the structure. CONSTITUTION:The outside of a structure 1 is housed in a continuous underground wall 3 of a slightly larger size than the periphery of the structure 1. As the structure 1 settles, a spacer 32 attached along the face touched by the structure 1 is cut off by a cutting edge 12 and the lower end of the cutting edge 12 is housed in the flat upper end of the wall 3 to start up the settlement of the structure 1. Only the ground 4 touched by the lower ends of jacks 2 is excavated and the jacks 2 are extended until the tip of the rods 21 of the jacks 2 reaches the ground 4. All area below the structure 1 is excavated and the structure 1 is settled while finely regulating the contracting speed of the jacks 2 and also while correcting the verticality. The settling operation can thus be easily made.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a method for submerging a structure.

<Conventional technology> When submerging a structure such as a caisson, if only the ground is excavated and the structure is submerged, the resistance applied to the outer peripheral wall of the structure varies depending on the properties of the ground around the submerged structure. There are cases where the left and right balance of the structure is lost and the structure is sunk tilted.

Conventionally, a method for constructing a structure has been used in which a continuous underground wall with uniform properties is constructed in the ground, and the structure is deposited using the wall as a guide.

However, even when constructing a structure using a continuous underground wall as a guide, a slight inclination may occur during the construction.

Caissons and other structures that form the foundation of buildings cannot be allowed to tilt even slightly.

Therefore, the following methods exist to correct the slight inclination of such a submerged structure.

A plurality of pressure chambers are provided at the lower end of the structure, and pressurized air is sent from the pressure chambers between the lower end of the structure and the ground to create buoyancy on the artifact.

The inclination direction of the structure is then corrected by adjusting the pressure air sent from each pressure chamber and changing the buoyancy of each pressure chamber.

Problems to be Solved by the Present Invention The following problems exist in the conventional structure submersion techniques described above.

Kui> It is difficult to make subtle corrections to the tilt direction of structures due to atmospheric pressure.

Since a plurality of pressure chambers separated by partition walls must be provided at the lower end of the structure, the device becomes large and complex.

OBJECTS OF THE INVENTION In order to solve the above-mentioned problems, an object of the present invention is to provide the following method for depositing a structure.

Kui〉A method for sinking structures that allows for subtle corrections in the direction of inclination of the structure and for ensuring that the structure is placed vertically.

A method of sinking a structure in which the direction of inclination of the structure can be corrected using a device with a simple structure.

Configuration of the Present Invention> An embodiment of the present invention will be described below with reference to the drawings.

<I> Apparatus of the present invention (Fig. 1.2) In this embodiment, the structure 1 is formed into a rectangular shape as shown in the figure.

A slab 11 is provided at the lower end of the structure 1, and a cutting edge 12 is provided on the outer peripheral edge of the slab 11 so as to project downward and the inner peripheral surface thereof is inclined outward toward the lower end.

Then, the rod 2 of the jack 2 is attached to the lower end of this cutting edge 12.
Position the tip of jack 1 and attach jack 2 in the vertical direction.

In this embodiment, four jacks 2 are attached to the four corners of a structure 1.

Exit> Method for sinking the structure The structure 1 with the above jack 2 attached is sunk in the following order.

(1) Construction of a continuous underground wall (Fig. 1.2) A structure in the pond ff14 whose outer circumference is somewhat larger than the planar outer circumference of structure 1 and whose inner circumference is somewhat smaller than the inner circumference of the cutting edge 12. A rectangular continuous underground wall 3 having the same shape as 1 is constructed.

This continuous underground wall 3 is constructed using bentonite mortar on-site and bentonite mortar.
This wall is made by kneading asphalt mortar and other assimilating agents and has uniform properties, strength, etc., and has water-stopping properties.If necessary, stress material 31 such as H-shaped steel is built into this wall to prevent water retention. Give it a function as a material.

Furthermore, when the outer surface of the structure 1 is housed within the continuous underground wall 3, the stress material 31 will be built outside the wall.

In this case, the spacer 32 is attached to the stress material 31 before it is built into the continuous underground wall 3 (Fig. 6.7).

The spacer 32 is a T-shaped spacer made of synthetic resin or the like.
■It is a member in the shape of a mold or the like, which is attached with bolts, adhesive, etc. along the surface of the stress material 31 in contact with the structure 1, and is designed to be scraped off naturally by the cutting edge 12 as the structure 1 sinks. There is.

(2) Installation of the structure (Fig. 1.2) The structure 1 is positioned so that the lower end of the cutting edge 12 fits within the upper end of the continuous underground wall 3, and construction begins.

The water level of the underground water within the continuous underground wall 3 is lowered using a deep well or the like, and the excavation work is performed using an oven.

(3) Excavation of the ground below the jack (Figure 3) Only the ground 4 facing the lower end of each jack 2 is excavated.

The amount of excavation at each position should be equal, and should be sufficient to allow the tip of the rod 21 to extend.

4) Extension of the jacks (Figure 3) Once the excavation of the ground 4 facing the lower end of each jack 2 is completed, extend each jack 2 until the tip of the rod 21 reaches the ground 4.

(5) Excavation of the entire surface of the lower part of the structure 1 (FIG. 4) After each jack 2 is fully extended, the entire surface of the ground 4 under the structure 1 is excavated.

The amount of excavation of the ground 4 is performed up to the tip position of the rod 21.

(6) Lowering the structure and correcting the sinking direction (4.5) Contract each jack 2 to lower the structure 1.

If the structure 1 tilts during descent, make fine adjustments by stopping the contraction of the jack 2 on the tilted side or slowing down the contraction speed, and then sink the structure 1 while correcting it in the vertical direction. .

(7) Removing the jacks After repeating the above operations and sinking the structure 1 to a predetermined position, remove each jack 2 to complete the sinking.

Effects of the Present Invention> Since the present invention has been described above, the following effects can be expected.

By attaching multiple jacks to the lower end of the structure and expanding and contracting the jacks, subtle corrections can be made to the inclination direction of the structure.

Therefore, structures can be laid down vertically and reliably.

The direction of inclination of the structure can be corrected using a device with a simple structure that requires only a plurality of jacks to be attached.

Therefore, the work can be done easily.

[Brief explanation of the drawing]

Fig. 1: An explanatory diagram of one embodiment of the present invention Fig. 2: A plan view of a structure positioned on a continuous underground wall Fig. 3: An explanatory diagram when the jack is extended Fig. 4 : Explanatory diagram when the jack is contracted Figure 5: Explanatory diagram when correcting the slope of the structure Figure 6: Explanatory diagram of stress materials and spacers Explanatory diagram with spacer installed

Claims (1)

[Claims] In a structure sinking method in which a structure is sunk using a continuous underground wall built in the ground as a guide, a jack is attached to the lower end of the structure, and the lower continuous underground wall where the jack is located is installed. A method for sinking a structure, characterized by excavating, extending a jack rod to reach a continuous underground wall, excavating the entire lower part of the structure, and then retracting the jack to lower the structure.