JPH0513778Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention relates to a structure placed on the ground for slope stabilization.

[Prior art]

Various methods have been used to stabilize slopes. For example, the block construction method involves lifting precast concrete blocks up a slope and arranging them on the ground to prevent the ground from collapsing.

The method of constructing a legal framework involves placing formwork vertically and horizontally on the ground, and pouring cement-based hardening material into the formwork to construct a legal framework and prevent the ground from collapsing.

[Problems to be solved by this idea]

The problems with the block construction method described above are that lifting a large number of heavy blocks up a slope requires a lot of labor, and since they are all made of precast concrete, the adhesion between the blocks and the ground is poor. That's true.

The problem with the method of construction is that it is difficult to assemble the formwork on the entire slope on-site, and hardening material cannot be poured until the entire slope is assembled, resulting in a long construction period. In addition, surface treatment of the cement-related hardening material that has been placed is required, making the construction process cumbersome. Furthermore, the slope is continuous over the entire slope, making structural calculations complicated.

This idea was made to solve the above problems, and aims to provide a slope stabilizing structure that is easy to install, shortens the construction period, and has good adhesion to the ground. purpose. A further object of this invention is to provide a slope stabilizing structure that has good weather resistance and is less subject to changes in history and history.

[Means to solve the problem]

The slope stabilizing structure according to this invention is a block-shaped structure made of precast concrete.

The slope stabilizing structure is formed in a cross-shape by a center portion having an anchor insertion hole penetrating in the vertical direction and overhanging portions projecting in all directions from the center portion. The height of the overhanging portion gradually decreases from the center to the tip. A filling hole is formed in the projecting portion to extend vertically through the projecting portion.

Further, the slope stabilizing structure made of precast concrete as described above may be formed from concrete mixed with 10 to 50 parts by weight of ultrafine powder with an average particle size of 1 μ or less per 100 parts by weight of cement. .

(Function) If placed on the ground, fixed to anchors, and arranged so that the overhanging parts are continuous vertically and horizontally with the overhanging parts of adjacent structures, the slope will be stabilized in the same way as a lattice-like legal framework. be able to. It does not require as many structures as the block construction method, and does not require the time and effort of assembling formwork.

If mortar or concrete is poured into the filling hole in the overhang, it will adhere to the ground.

By mixing ultrafine powder, carbon dioxide and rain are prevented from penetrating and neutralizing the hardening material.

〔Example〕

This invention will be explained in detail below based on an embodiment shown in the drawings.

What is shown in FIG. 1 is a slope stabilizing structure 1 according to this invention, which is made of precast concrete. The slope stabilizing structure 1 consists of a central part 2 and overhanging parts 3 extending from the central part 2 in all directions. An anchor insertion hole 4 penetrating vertically is formed in the central portion 2. The overhanging part 3 is the central part 2
The height gradually decreases from the top to the tip. A filling hole 5 penetrating vertically is formed in each overhang portion 3 . The filling hole 5 is formed long in the longitudinal direction of the overhang portion 3.

The slope stabilizing structure 1 as described above may be formed of ordinary concrete, but cement
100 parts by weight of ultrafine powder with an average particle size of 1μ or less
It may also be formed from concrete mixed with ~50 parts by weight.

In the example, 100 parts by weight of cement was mixed with 10 to 50 parts by weight of ultrafine powder with an average particle size of 1 μ or less and 1 to 10 parts by weight of a high performance water reducing agent, and kneaded at a water-cement ratio of 0.3 or less. be.

As the ultrafine powder, silicon or siliceous dust is particularly suitable, and other ultrafine powders with low water solubility such as fly ash, calcium carbonate, silica gel, titanium oxide, aluminum carbonate, etc. can be used.

The amount of ultrafine powder used is 50 parts per 100 parts by weight of cement.
If the amount exceeds 1 part by weight, the fluidity of the kneaded product will be significantly reduced, making it difficult to mold the product, and the strength will also be insufficient.

Examples of high-performance damping agents include those whose main components are salts of melamine sulfonic acid formaldehyde condensates, polymeric lignin sulfonates, polycarponates, and the like.

The standard usage amount of high performance water reducer is for cement.
It is preferably added in an amount of 0.3 to 1.0% by weight, or more in the present invention, and is not more than 10 parts by weight, preferably 2 to 5 parts by weight, based on 100 parts by weight of cement. A high-performance water reducing agent is essential in order to obtain a kneaded product with a low water-to-cement ratio, and if the amount exceeds 10 parts by weight, the water reducing effect will not be accompanied by an increase in the amount added, and will instead have a negative impact on hardening.

If even higher strength is required, at least one dihydrate or anhydrous salt of calcium sulfate is added to the composition, based on 100 parts by weight of cement.
Concrete mixed with 20 parts by weight can be used, and if higher strength is required,
The concrete aggregate may be hard, preferably one having a Mohs hardness of 6 or more. Further, the concrete curing may be general curing, but for practical purposes, it is better to perform accelerated curing such as steam curing. Furthermore, if calcium sulfate is added to accelerate curing, even higher strength can be stably obtained.

The graph shown in Figure 5 shows the pore size distribution of a hardened cement paste formed by mixing 10 parts by weight of ultrafine powder with 100 parts by weight of cement and a hardened normal cement paste. A cement paste hardened body mixed with fine powder contains only about half as much air as a normal cement paste hardened body, and the permeability of carbon dioxide and rainwater is extremely reduced.

The slope stabilizing structure 1 as described above is installed on the ground.

An anchor 6 made of prestressed steel or a lock bolt is driven into the ground in advance, and the protruding portion of the anchor 6 from the ground surface is inserted into the anchor insertion hole 4 and fixed with a nut or the like.

The overhanging portions 3 abut against the overhanging portions 3 of adjacent slope stabilizing structures 1, and are arranged so that the overhanging portions 3 of the plurality of slope stabilizing structures 1 are continuous vertically and horizontally as shown in FIG. In other words, the cross-shaped slope stabilizing structures 1 are continuous in a lattice pattern like a legal frame. Therefore, as in the block construction method, structure 1
The ground can be strongly stabilized without having to install them next to each other with no gaps between them.

The filling hole 5 of the overhanging portion 3 is filled with mortar or concrete. The filling hole 5 penetrates vertically and flows out onto the ground, resulting in good adhesion to the ground of the structure 1.

[Effect of idea]

Since this invention has the above-described configuration, the following effects can be obtained.

(b) Since the structures are shaped like blocks, it is easy to carry them in, and the structure can be laid out in a lattice-like manner by butting the protruding parts of adjacent structures together, making the block-laying construction process easier. Structure transport work does not require labor.

(b) It is only necessary to place it on the ground and fill the hole with mortar or concrete, and there is no need to assemble a formwork as in the method of method construction, which shortens the construction period.

(c) The height of the structure is high at the center, and the strength of the center of the structure, where a large bending moment acts, is high, making it a strong slope stabilizing structure.

(d) Since the mortar and concrete filled in the filling holes are cast directly into the ground, the structure and the ground adhere well and follow the unevenness of the ground to stabilize the slope. I can do it.

(e) By using cement mixed with ultra-fine powder for structures, carbon dioxide and rain are prevented from penetrating into the interior and neutralizing the hardened material, improving weather resistance and improving the structure's structure. It can prevent deterioration over time.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the slope stabilizing structure according to this invention, Fig. 2 is a plan view thereof, Fig. 3 is a sectional view taken along line A-A in Fig. 2, and Fig. 4 shows the structure on the ground. FIG. 5, which is a perspective view of the installed state, is a graph showing the pore size distribution of the hardening material. 1... Slope stabilization structure, 2... Central part, 3...
...Overhanging portion, 4...Anchor insertion hole, 5...Filling hole, 6...Anchor.

Claims (1)

[Claims for Utility Model Registration] (1) It is formed in a cross shape by a central part having an anchor insertion hole penetrating vertically and an overhanging part extending in all directions from this central part, and the overhanging part is the central part. A slope stabilizing structure made of precast concrete that gradually becomes lower from the top to the tip and has a filling hole that penetrates the top and bottom. (2) A claim characterized in that the concrete is formed by mixing 10 to 50 parts by weight of ultrafine powder with an average particle size of 1 μ or less to 100 parts by weight of cement.
(1) The slope stabilization structure described in (1).