JPH047780B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a method of constructing an anchor for reinforcing the base of an underground structure, which prevents the base of the underground structure from rising due to water pressure after the underground structure is submerged. .

(Problem to be solved by the invention) Underground structures that are sunk underground are subject to buoyancy due to groundwater, and water pressure acts on the base of the structure, so it is necessary to provide some kind of measure for the structure. .

The common method is to deal with buoyancy by using the weight of the building structure, and to deal with water pressure by making the bottom plate thicker, but if the bottom plate alone is used to resist water pressure, the bottom plate will be quite thick, especially if the depth is large. must be done, and high costs are unavoidable.

This invention was made with the aim of reducing the number of frames and costs by making the bottom plate thinner.This was solved by installing an anchor under the bottom plate and using it to resist water pressure. That is.

(Means for Solving the Problems) In the present invention, the bottom plate is made thinner by making the anchor installed below resist the water pressure acting on the bottom plate, thereby reducing the number of building blocks.

After the underground structure is submerged, the anchors that reinforce the base, that is, supplement the resistance of the base to water pressure, are inserted into the guide pipes that were built during the above-ground construction, and are installed in several locations underground.

When constructing a structure above ground, multiple guide pipes are built through the slab from the ground to the base, and are used to install anchors underground.

After the anchor is installed in the predetermined position, the tension member connected to the anchor is tensioned and fixed to the base plate, and the work is completed.

The structure is submerged by filling its frame with water and excavating beneath the base using an earth anchor that penetrates the wall and is installed underground.

(Example) The present invention will be described below based on drawings showing one example.

In this invention, after underground structure A is submerged, its bottom plate 1 is
This is a method in which an anchor 4 is installed below, and the resistance force of the anchor 4 can also bear part or all of the water pressure acting on the bottom plate 1.

The anchor 4 is installed by being inserted into a guide pipe 5 that is built through the slab 3 from the ground to the bottom plate 1 when the underground structure A is constructed above ground. After installation, the tension material 6 is tightened and fixed to the bottom board 1.

Next, the construction procedure will be explained according to FIG.

When constructing the underground structure A above ground, a guide pipe 5 and a casing 7 are built inside it.

First, this underground structure A is excavated under the bottom plate 1 with an excavator inserted into the casing 7,
The inside of the structure is filled with water, and the structure is submerged using the reaction force of the earth anchor 8 that penetrates the inside of the wall 2 and is installed underground ().

After the underground structure A is submerged, the anchor 4 is inserted into the guide pipe 5 and installed in the underground borehole ().

After installing the anchor 4, mortar 9 is injected into the guide pipe 5 to stop water in the bottom plate 1 ().
This mortar 9 protects the anchor 4 in the guide pipe 5 hole of the bottom plate 1 and is injected to a height required for water stoppage. After the mortar 9 has hardened, the water inside the frame is drained. The details at this time are as shown in FIG.

Subsequently, the guide pipe 5 is removed, a jack 10 is attached to the tension material 6 connected to the anchor 4 on the bottom board 1, and tension is introduced into the tension material 6 ().

Next, the tension material 6 is fixed to the bottom board 1, and the work is completed by capping the part to stop water ().

(Effects of the Invention) This invention is as described above, and since the water pressure acting on the bottom plate can be reduced by the anchor, the bottom plate can be made thinner, and as a result, it is possible to reduce costs. .

This anchor also effectively acts against the buoyant force acting on the entire structure.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the construction procedure of the present invention, and FIG. 2 is a sectional view showing the mortar injection part. A: Underground structure, 1: Base, 2: Wall, 3: Slab, 4: Anchor, 5: Guide pipe, 6: Tensile material, 7: Casing, 8: Earth anchor,
9: mortar, 10: jack.

Claims (1)

[Claims] 1 When constructing a structure underground, multiple guide pipes penetrate the slab from the ground to the base, and the structure is filled with water, and the earth anchor is installed underground by penetrating the wall. After inserting an anchor to reinforce the bottom plate into the guide pipe and installing it underground, mortar is injected into the guide pipe to stop the water in the bottom plate, and then the water inside the frame is stopped. A construction method for anchors for reinforcing the base of underground structures, which consists of the steps of draining water, removing the guide pipe, tensioning the tension material connected to the anchor, and fixing it to the base.