JPS59652B2 - Jisuberiyokushikouhou - Google Patents

Description

[Detailed Description of the Invention] A phenomenon in which the equilibrium state of the ground mass is broken and the ground mass moves downward or sideways on a part of the slope of a mountain, hill, or plateau is generally called a landslide or collapse. are doing.

This phenomenon is caused by so-called natural factors, such as heavy rain caused by typhoons, localized frontal torrential rain, rainy season, long rain in autumn, snowmelt, etc., and also caused by the slope head caused by road construction, residential land development, etc. It can also be induced by artificial factors such as loading.

In this case, the slope where the collapse occurs is generally steep, but it also often occurs on relatively gentle slopes, and the movement at this time is extremely slow and continuous, and this is generally called terrestrialization to distinguish it from collapse.

In general, damage caused by slipping on gentle slopes due to the low angle of the upper surface of the ground is severe, and this often occurs on relatively gentle slopes, especially gentle slopes of 5 to 20 degrees. This relates to a construction method that suppresses

Conventional above-ground restraint construction methods mainly include a pile insertion method in which a restraint structure consisting of steel or reinforced concrete piles is installed underground, or a shaft construction method that aims to increase the diameter of the restraint 1F structure. It was used b).

All of these conventional construction methods utilize the shear resistance, bending resistance, etc. of the steel material that constitutes the restraint structure.

Generally speaking, it is well known that the shear stress of steel materials is significantly smaller than the tensile stress, but as can be easily inferred from this, in order to resist the huge ground sliding force, There is no choice but to increase the number of piles or increase the diameter of the piles, which not only increases the difficulty of the construction method itself but also increases the construction cost, making it a very uneconomical method of restraint construction. There wasn't.

The purpose of this invention is to provide a deterrent method that eliminates the drawbacks of the conventional above-ground deterrent construction method, and by obtaining the above-ground deterrent force by the tensile stress of the steel material for the deterrent structure,
This method rationally overcomes the above-mentioned difficulties.

The present invention will be explained below with reference to drawings showing embodiments thereof.

First, the ground restraint IF found by the analysis is placed underground at the location determined by the ground stability analysis.
A tunnel 4 having a size and shape sufficient to obtain the added resistance force required for this is excavated almost horizontally so as to penetrate the sliding earth mass 2, cross the sliding surface 1, and reach the stable base 3.

In this case, ground stability analysis shows that the resistance force that should be added in order to maintain the specified stability is mainly due to the stable foundation 3 and the tunnel 4, relative to the width of the sliding soil mass that the tunnel support should have. This is due to the frictional force (shearing resistance) with the surrounding area, so the longer the length of the tunnel extending into the foundation, the better, but for practicality and cost reasons, it is necessary to reduce the length of the tunnel extension inside the foundation. For this purpose, it is preferable to provide a lock anchor 7 or a convex portion 11 on the outer periphery of the tunnel, which will maintain the required resistance force.

In addition, in order to prevent local movement of the sliding earth mass 2 or pull-out between multiple tunnels 4, concrete blocks, beams, slabs, and other ground covering structures 8 are installed on the ground surface 10, and the ground covering structures and the tunnels 4 are The tie rods 9 can be easily connected between the two, and as a result, the stability of the ground covering structure 8 can be significantly improved.

After excavating the tunnel 4, a tensile steel material 5 with the required tensile stress is placed inside the tunnel in order to bear the predetermined resistance force obtained from the ground stability analysis, and the remaining tunnel interior space is filled with concrete. and complete the ground deterrent structure.

In this case, if necessary, it is also possible to introduce prestress into the l-channel 4 using the commonly used prestress concrete method, thereby directly applying shear resistance to the sliding surface 1. The effectiveness of ground deterrence can be increased by adding

In addition, not only during the excavation of the tunnel 4, but also after the tunnel is completed, by installing appropriate drainage equipment inside the tunnel 4 to the outside of the tunnel, ground water within the ground above ground can be removed and the effect of preventing ground water from entering the ground can be improved. can.

According to this invention, as described above, the sliding force on the ground is
- Since the tensile stress of the steel material 5 placed in the tunnel 4 is counteracted to prevent ground climbing, it is easy, economical, and highly safe construction method even for large-scale ground climbing. It is easy to construct and has the advantage of being industrially fire resistant.

[Brief explanation of drawings]

The drawing is a schematic sectional view showing one embodiment of the construction method of the present invention. 1... Sliding surface; 2... Sliding earth mass; 3
・・・・・・Foundation; 4... What Nervous; 5...
...Tensile steel; 6...Concrete; 7...
...Rock anchor; 8... Ground cover structure (
plate, block, beam); 9... Quirod; 10
・・・・・・The surface of the earth.

Claims (1)

[Scope of Claims] 1. A horizontal tunnel is provided in the ground above ground across the sliding surface, and the tunnel is filled with concrete in which steel members having a tensile force capable of resisting the sliding force on the ground are arranged. This method is characterized by the following: 2. A nearly horizontal tunnel is provided in the ground above ground across the sliding surface, and the tunnel is filled with concrete having a tensile force capable of resisting the ground sliding force, and the inside of the base of the tunnel is This method involves installing a convex part or an anchor in a part of the earth, and installing a tie rod in the sliding earth mass part to connect the tunnel to the ground covering structure on the ground surface.