JPH0493430A - Floating prevention method for underground structure - Google Patents

Abstract

PURPOSE:To easily and properly prevent an underground structure from being unseated by fitting a bracket to a fixed structure fastened underground for restraining the motion of the aforesaid underground structure. CONSTITUTION:Fixed structures 1a and 1b formed as retaining piles are driven deep underground, and fixed outside an underground structure 10a formed as a shield tunnel. Furthermore, openings 17 and 17 are formed at both sides of the underground structure 10a near the upper section thereof at every predetermined interval, and the rear sides 20 and 20 of the openings 17 and 17 are internally cut and expanded. Then, brackets 5 are bolted or welded to the fixed structures 1a and 1b. In this case, a shield tunnel mid-floor plate 15 is so fitted as to be constrained with the brackets 5, thereby preventing the underground structure 10a from being heaved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for preventing uplift of underground structures such as shield tunnels and box culverts.

[Conventional technology]

When the moisture content of the ground on which underground structures such as shield tunnels and box culverts are built is high, the uplift pressure acting on the underground structures increases as the groundwater level rises.

Also, in order to enlarge the underground structure, the ground above the underground structure may be excavated.

If this happens, the underground structure may be lifted up and may be damaged.

Therefore, as a measure to prevent uplifting and damage to conventional underground structures, methods have been developed to lower the groundwater level and reduce uplift pressure.
Methods of increasing resistance by increasing the weight of underground structures - Methods of increasing resistance with earth anchors - Making the surrounding ground impermeable to block groundwater - Do not apply uplift pressure to underground structures methods etc. are being carried out.

However, all of the methods IL are large-scale construction methods.

The present invention has been made in view of the above-mentioned problems, and its technical object is to easily and reliably prevent underground structures from floating up.

[Means to solve the problem]

The first invention provides a fixed structure 1a or lb which faces each other underground.
A bracket 5 is attached to the fixed structure 1a or lb, and the bracket 5 restrains the underground structure 10a or 1ob laid underground.
The second invention, which is a method for preventing uplift of an underground structure that prevents uplift of 0a or 10b, attaches a bracket 5 to an underground structure 10a or 10b laid underground, and installs the bracket 5 into the ground. A method for preventing lifting of an underground structure by locking it to a fixed structure 1a or ib fixed oppositely to prevent the underground structure 10a or lob from lifting. fixed structure 1a
Alternatively, a beam 6 is installed between the ibs, and this beam 6 restrains the underground structure 10a or 10b laid underground to prevent the underground structure 10a or 10b from rising. Fourth invention IL as a prevention method Fixed structures 1a or 1b fixed underground facing each other and underground structures 10a laid underground
or 10b is fixed with improved soil 23 mixed with a consolidation agent to prevent the lifting of underground structures 10a or 10b. [Function] First Invention: Earth retaining Fixed structure 1 formed as a pile
(a) Or another fixed structure 1b formed as a structure is fixed by driving it into the ground facing each other.

Then, the bracket 5 attached to the fixed structure 1a or 1b holds down the underground structure 10a formed as a shield tunnel laid underground or the underground structure 10b formed as a box culvert, and Structure 1
Prevents lifting of 0a or 10b.

The second invention prevents the underground structure 10a or 10b from floating up by locking the bracket 5 attached to the underground structure 10a or 10b to the fixed structure 1a or 1b.

The third invention suppresses the underground structure LOa or lOb with the beam 6 installed between the fixed structures 1a or ib to prevent the underground structure 10a or 10b from rising.

The fourth invention provides improved ground 2 mixed with a consolidation agent between the fixed structure 1a or 1b and the underground structure 10a or 10b.
3 to prevent the underground structure 10a or 10b from floating up.

〔Example〕

FIG. 1 and FIG. 2 iL are explanatory diagrams of an embodiment of the first invention.

This embodiment is suitably applied when an underground structure 10a formed as a shield tunnel and laid underground is to be expanded.

First, underground structure 10 formed as a shield tunnel
Fixed structure 1 formed as a retaining pile on the outside of one of a.
Drive a deep into the ground and fix it.

Then, a fixed structure 1b formed as another structure is driven deep into the ground and fixed.

Openings 17.17 are located near the top of both sides of the underground structure 10a formed as a shield tunnel.
are formed at predetermined intervals as shown in FIG.

This opening 17. ．． 17 back part 2020,
Cut and expand from the inside.

The bracket 5 is attached by bolts or by welding to the fixed structure 1a formed as a retaining pile appearing on the cut-out and widened back part 20.20 and the fixed structure 1b formed as another structure. .

Then, the bracket 5 is attached 1. The tunnel floor plate 15 of the shield tunnel is attached in such a manner that it is pressed by the bracket 5, and the underground structure 10a formed as a shield tunnel is prevented from lifting. This is a prevention method.

When performing construction using the method described above, the part where the underground structure 1a is installed is divided into regular intervals in the longitudinal direction and the construction is performed. An earth retaining wall is also provided at the longitudinal end of the section, but this earth retaining wall is provided only at the top of the underground structure 1a.

In the above example, 13 one of the fixed structures 1a was used as an earth retaining pile and the other fixed structure was used as another structure. It may also be formed as other structures.

This also applies to other embodiments of the invention.

An embodiment of the second invention +4 Car whose illustration is omitted 1st
A fixed structure 1a is formed by forming an underground structure similar to the underground structure 10a formed as a shield tunnel in FIGS. 1 and 2 as an earth retaining pile in an embodiment of the invention, and as another structure. Fixed structure 1b1 formed Bracket 5
This is a method to prevent underground structures from floating up.

And, this embodiment iL bracket of this invention is
Attached to an underground structure formed as a shield tunnel, this bracket is locked to a fixed structure formed as an earth retaining pile and a fixed structure formed as another structure,
This is a method for preventing uplift of an underground structure formed as a shield tunnel.

Figures 3 and 4 are explanatory diagrams of an embodiment of the third invention, and in the following, the same parts as in the embodiment of the previous invention are used, the same reference numerals are used, and some explanations are omitted. Shiheko Example iL The underground structure 1b is formed as a box culvert.

In this embodiment of the invention, the upper surface center portion of the underground structure 10b formed as a box culvert &:S
As shown in FIG. 4, openings 17 are provided at predetermined intervals.

Furthermore, as shown in Figures 3 and 4, this opening 1
7, that is, the fixed structure 1 located on the back side of the opening 17 and formed as the earth retaining pile.
From a, cut out and widen the part that reaches the fixed structure 1b formed as another structure.

Then, a beam 6 is installed between the fixed structures 1a and Ib. Furthermore, this beam 6 is installed in such a manner as to restrain the underground structure 10b, and is a method for preventing the underground structure from rising.

Figures 5 and 6 are explanatory diagrams of an embodiment of the fourth invention.

In this example, a fixed structure 1a formed as an earth retaining pile,
A cement-based solidifying agent such as cement milk or a mixture of water glass and cement milk is mixed into the ground between fixed structures Ib formed as other structures to form fixed structures 1a, The ground between 1b and underground structure 10b is fixed to form improved ground 23.

This is a method for preventing uplift of an underground structure, in which the underground structure 1b is restrained by the improved ground 23 fixed to the fixed structures 1a, lb, thereby preventing the uplift of the underground structure 1b.

〔Effect of the invention〕

First to Fourth Inventions Attach a bracket to a fixed structure fixed in the ground, or lock the bracket, or install a beam - and restrain the underground structure with these brackets and beams. It's a method. Another method is to fix the fixed structure and the underground structure using improved soil mixed with a solidifying agent.

Therefore, by carrying out construction work in a relatively narrow area,
It is possible to reliably prevent an underground structure installed in a ground with a high moisture content from floating up.

[Brief explanation of the drawing]

Figures 1 and 2 are explanatory diagrams of an embodiment of the first invention, where Figure 1 is a sectional view and Figure 2 is a plan view. Figures 3 and 4 are illustrations of an embodiment of the third invention. This is a diagram for explaining the embodiment, and FIG. 3 is a cross section 1.
4 is a plan view; FIGS. 5 and 6 are explanatory views of an embodiment of the fourth invention; FIG. 5 is a cross-sectional view; and FIG. 6 is a plan view. la...Fixed structure formed as earth retaining pile, 1b...
Fixed structures formed as other structures 5. Brackets, 6. Moxibustion 10a. Underground structures formed as shield tunnels 10b. Underground structures formed as box culverts, 23. improved spoon

Claims (4)

[Claims] (1) A fixed structure is fixed and installed facing the ground, a bracket is attached to this fixed structure, and with this bracket,
A method for preventing uplifting of underground structures, which prevents uplifting of underground structures by restraining underground structures laid underground. (2) An underground structure in which a bracket is attached to an underground structure laid underground, and this bracket is locked to a fixed structure fixed underground to prevent the underground structure from floating up. How to prevent from lifting. (3) Installing a beam between fixed structures fixed underground, and using this beam to restrain the underground structure,
A method for preventing underground structures from rising. (4) Fixing fixed structures facing each other in the ground and underground structures laid underground with improved soil mixed with a consolidation agent to prevent the underground structures from floating up. Method for preventing uplift of underground structures.