JPH0522005B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for constructing a steel frame embankment body and a frame dam/earth retaining wall constructed thereby. The present invention relates to a method of constructing a steel-framed embankment body, such as a frame dam or retaining wall, in which the embankment body is formed by inserting materials, or in which a water passage is also provided.

[Conventional technology]

Traditionally, dams constructed in various places have been mainly for large-capacity hydroelectric power generation and agricultural purposes, and have meant concrete dams. However, in the last ten years,
As dams for various purposes are constructed, new types of dams such as steel frame dams, concrete frame dams, and concrete block dams are being developed.

Among these dams, steel frame dams employ a framework constructed by transporting steel members that have been prefabricated or partially assembled at a factory to the construction site and joining them with bolts, welding, etc. . The framework has holes at the front, back, left and right, and at the top, and the front and rear surfaces are lined with outflow prevention material such as pine, and the filling material is put into the inside of the framework. Embankment body is constructed.

On the other hand, there is a special requirement to be able to take out a portion of the stored water at any time even if the water level inside the dam is low, so some dam walls have a part that maintains water permeability. In this case, crushed stone is placed inside the framework to ensure water permeability while providing both water storage and water intake functions.

[Problem to be solved by the invention]

By the way, at some steel frame dam construction sites,
There are areas where it is difficult to obtain crushed stone or where it is difficult to transport crushed stone. At such construction sites, the construction of steel frame dams is hindered, so there is a strong demand for the development of a water-permeable and inexpensive filling material to replace crushed stone. As an example, while the front and rear surfaces of the framework of a steel frame dam are lined with water-permeable outflow prevention material such as pine, the internal space is filled with currently excavated sand; One possible method is to stuff the bag inside. However, dam walls using this filling material cannot be expected to have good water permeability like crushed stone, and there is a problem that the water passage function is significantly reduced. Furthermore, the spill-preventing materials used to prevent the currently excavated sand from flowing out after injection lack the permanent durability and impact resistance of steel frameworks, and the overall strength of the dam wall is insufficient. Problems also arise.

On the other hand, when the water level inside the dam rises due to heavy rainfall, crushed stone will not fluidize and flow out, but if excavated sand is put in, the currently excavated sand will become fluidized. It becomes easier to leak. Therefore, through the applicant's many years of experience and research in constructing frame dams and retaining walls, a new filling material was developed that mixes 5 to 10% soil cement into the currently excavated sand and solidifies it.

The present invention was made in view of the above-mentioned problems, and its purpose is to form a water-blocking embankment body by inserting a new type of filling material into the framework of a steel frame dam, while also preventing water from passing through. Where needed, water permeability can be achieved by inserting a bag filled with the filling material and solidifying it, or by interposing drainage pine material with water permeability. It is possible to construct a dam wall, and by constantly extracting water from permeable areas, it is possible to suppress the rise in the water level in the dam sediment and reduce the water pressure acting on the dam body. It is an object of the present invention to provide a method for constructing a steel frame embankment body, and a frame dam/earth retaining wall constructed thereby, in which construction costs can be reduced by using existing excavated sand. .

[Means and actions for solving the problem]

The present invention is applied to an embankment-like structure in which a framework body assembled by joining iron members is filled with filler material. As shown in Fig. 1, its characteristics are that the filling material 4 is a filling material made of currently excavated sand mixed with soil cement;
Outflow prevention materials 5, 5 (see Fig. 2) are stretched on the rear surface 3b, and filling soil 4 is filled between the flow prevention materials 5, 5. This allows the liquid to solidify without flowing out.

The outflow prevention material 5 is made of pine 5 that does not have water permeability or has a mesh size smaller than the grain size of the currently excavated sand.
A, a net 5B or a plate material 5C, which are stretched on each inner surface of the frame body 3.

The outflow prevention material 5 is a removable panel material 5D.
As shown in FIG. 3, they may be installed on the outer surface of each of the framework bodies 3 and removed after the filling soil 4 has solidified.

It is preferable that the filling material 4 is compacted within the framework 3.

In addition, as shown in Fig. 4, the filler material 4 is a filler material 4 made of currently excavated sand mixed with soil cement, and a sand bag 8 filled with earth and sand mixed with soil cement and cured. The front surface 3a and rear surface 3b of the framework bodies 3A and 3B at locations other than the portion through which the earth and sand 4 is passed
Filled between the outflow prevention materials 5 and 5 (see Figure 2) stretched over the soil, and solidify the filled earth and sand 4 between the outflow prevention materials 5 and 5 without flowing out, while the soil bag 8 is
It is put into the interior 3d of the framework 3C at a location such as a water passage where water permeability is required.

As shown in FIG. 5, the filling materials are a water-permeable drainage pine material 9, and a filling soil 4 made of currently excavated sand mixed with soil cement.
The interior 3d of the framework body 3C is the part that is used as the water passage part.
At the same time, the filling soil 4 is placed in the surrounding area 10 with outflow prevention materials 5, 5 or drainage pine material 9 stretched on the front surface 3a and rear surface 3b of the framework bodies 3A, 3B at locations other than the water passage portions. The earth and sand 4 in the filling is solidified without flowing out.

By any of the above methods, the frame dams 1, 1
1, 12 [see Figures 1, 4, and 5] and retaining walls 13 [see Figure 6] can be constructed.

〔Effect of the invention〕

According to the present invention, embankment-like structures such as frame dams and retaining walls can be constructed by inserting and solidifying an inexpensive filling material made by mixing 5 to 10% soil cement into the existing excavated sand into the framework. Since the embankment is constructed in parallel, the embankment is water-tight and has excellent durability and impact resistance.
Construction can be done inexpensively and easily.

On the other hand, even for frame dams and earth retaining walls that require permeability to allow drainage from the dam's storage, cutting, or embankment, it is necessary to fill them with inexpensive filling material and insert solidified sand bags. It can be constructed at low cost by providing water permeability or by interposing water permeable drainage pine material.

In this way, if a frame dam is equipped with permeable parts, it is possible to suppress the rise in the water level within the dam sediment even during rainy seasons, and at the same time, it is possible to reduce the water pressure acting on the dam body, and to reduce the water pressure on the dam body. Miniaturization becomes possible.
In addition, the retaining wall will also have areas with good water permeability, which will suppress the rise in the groundwater level and prevent the collapse of cut and embankment on steep slopes.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Below, a frame dam and retaining wall to which the present invention is applied will be described in detail based on examples thereof with reference to the drawings.

The embankment-like structure 1 shown in Fig. 1 is an example of a frame dam.
The iron member 2 constituting the frame body 3 is a horizontal member 2
a, a vertical member 2b, and a front and rear member 2c. These iron members 2 are processed in advance at a factory etc.
After being partially assembled as necessary, it is transported to the construction site across the river. Then, the iron members 2 are sequentially assembled into the frame body 3 by bolting, welding, etc., and the water passage part 14 of the low top part 3f and the embankment of the high sleeve part 3g connected thereto are separated from each other by a certain space. It is formed to surround.

The front surface 3a and the rear surface 3b are the surface parts of the framework body 3.
An opening 15 is formed in the upper surface 3e and the frame 3
An internal space 16 is secured within. The water passage portion 14 is a portion through which water 17 overflows, and is located approximately at the center of the river.

Sediment is collected from the river bed and riverbank using excavators and sampling equipment. Then, soil cement is mixed into the currently excavated sand containing moisture to give a mixing ratio of 5 to 10%, and processed into filling earth and sand as the filling material 4. The filling soil 4 is filled into the inner space 1
6, as shown in Figure 2,
Except for the upper surface 3e of the frame body 3, the front surface 3a and the rear surface 3b
The opening 15 is closed with outflow prevention materials 5, 5 stretched from the inner surface of the iron member 2. As the outflow prevention material 5, a mat 5A, a net 5B, or a plate material 5C which does not have water permeability or has a mesh size smaller than the grain size of the currently excavated sand is adopted.

By stretching these outflow prevention materials 5, 5, the internal space 16 of the framework body 3 is cut off from the outside, and the filling soil 4, which is a mixture of soil cement and currently excavated sand, is placed inside the framework body 3. It is thrown in from the top surface 3e.
The filling soil 4 deposited between the outflow prevention agents 5 and 5 is almost
Every time the height increases by 50 cm, pressure is mechanically applied from above using a compactor to compact the material. During,
The filling earth and sand 4 is blocked by the mats 5A, the nets 5B, or the plates 5C, and does not flow out to the outside. The filled earth and sand 4 after being filled solidifies after a necessary curing period, and becomes a bank-like structure 1 having water-blocking properties.
Note that the outflow prevention material 5 remains enclosed in the bank-like structure 1, and the water 17 is taken out only from the water passage portion 14.

As shown in FIG. 3, a panel material 5D that is detachable from the frame body 3 may be employed as the outflow prevention material. Depending on the purpose of use, it may be a material with small openings such as Mat 5A, or a material with no water permeability. The panel material 5D is stretched over the outer surface of the framework body 3, and is removed after the filling earth 4 has solidified. Reuse can also reduce construction costs.

FIG. 4 shows a frame dam 11 with water permeability. The framework body 3 is the framework body 3 of the part other than the water passage part.
It is roughly divided into A, 3B, and a framework body 3C which serves as a water passage section. That is, all the framework bodies 3 except the framework body 3C are lined with outflow prevention materials 5, 5 (see FIG. 2), or are lined with a panel material 5D (see FIG. 5).
The inner space 16 is also partitioned off from the frame body 3C located in the water passage part 14 with an outflow prevention material if necessary.

Into the frameworks 3A and 3B, filling soil 4, which is made by mixing soil cement into the currently excavated sand, is placed, and after solidification becomes a water-impermeable dam wall. On the other hand, a sand bag 8 filled with earth and sand mixed with soil cement and cured is put into the interior 3d of the framework 3C, which is a portion to be used as a water passage part, so that the part of the framework 3C has water permeability. has been done. Therefore, even if the water level of the water 17 behind the frame dam 11 is lower than the top 3f of the water intake part 14, the water flows between the respective soil bags 8, and a portion of the water 17 always flows downstream. can be done. Note that the outflow prevention materials 5, 5 and the panel material 5D are not applied to the frame body 3C.

Figure 5 shows a frame dam 1 with drainage pine material 9 interposed.
This is an example of 2. In the interior 3d of the framework 3C, which serves as a water passage, for example, two pieces of drainage pine material 9, 9 with water permeability used for embankment and cutting are interposed,
The space surrounded by these and the above-mentioned outflow prevention materials 5, 5 is filled with filling earth and sand 4. When the filling soil 4 is compacted, layered one by one and solidified, a partially permeable dam wall is constructed.

If a retaining wall 13 is constructed in the same manner as the frame dams 1, 11, and 12 described above, as shown in FIG. 6, collapse of the embankment 18 can be prevented.
When the amount of rainfall is large, water that has permeated into the embankment 18 can be made to flow through the permeable parts, suppressing the rise in the groundwater level, etc., and being discharged to the outside 19 of the retaining wall 13.

As can be seen from the detailed description above, if an inexpensive filling material made by mixing 5 to 10% soil cement into the currently excavated sand is put into a framework covered with outflow prevention material and allowed to solidify. Frame dams, earth retaining walls, etc. that are waterproof, durable, and highly impact resistant can be constructed easily and inexpensively. By interposing soil bags or drainage pine materials in which the above-mentioned filling material is solidified, it is easy to construct a bank-like structure with permeability so that water stored in a dam or drained from cuttings or embankments can be taken out at all times. It can be installed in

If it has water permeability, it is possible to suppress the water level in the dam sediment from rising during the rainy season, and it is possible to reduce the water pressure acting on the embankment body. and,
The levee body will also be made smaller. It also has good water permeability and can be used as an earth retaining wall to prevent collapse of cut and embankment.

[Brief explanation of the drawing]

Fig. 1 is a partial perspective view of a frame dam to which the steel frame embankment construction method of the present invention is applied, Fig. 2 is a sectional view taken along the - line in Fig. This is a frame dam, which is a cross-sectional view of the part corresponding to the - arrow in Figure 1, Figures 4 and 5 are partial perspective views of the frame dam with a water passage, and Figure 6 is a partial perspective view of the frame dam with a retaining wall and retaining wall. FIG. 1, 11, 12, 13... Embankment-like structure (frame dam, retaining wall), 2... Iron member, 3... Frame body,
3A, 3B...Framework for parts other than the water passage part, 3
C...Framework body of the part to be the water passage part, 3a, 3
b... Surface part (front, rear), 3d... Inside, 4...
... Filling material (filling earth and sand), 5... Outflow prevention material, 5A
...Matsuto, 5B...Net, 5C...Plate material, 5
D... Panel material, 8... Sediment bag, 9... Drainage pine material, 10... Surrounding part.

Claims (1)

[Scope of Claims] 1. In an embankment-like structure in which a framework body assembled by joining iron members is filled with filler material, the filler material is filler material made of currently excavated sand mixed with soil cement. A run-off prevention material is provided on each surface of the framework body, and filling earth and sand is filled between the run-off prevention materials, so that the filling earth and sand is solidified without flowing out between the run-off prevention materials. A method for constructing a steel frame embankment body characterized by: 2. The outflow prevention material is pine that does not have water permeability or has a mesh size smaller than the grain size of the currently excavated sand;
Claim 1, characterized in that the material is a net or a board material, and is stretched on the inner surface of each of the framework bodies.
The method for constructing a steel frame embankment described in . 3. The outflow prevention material is a removable panel material, is stretched on the outer surface of each of the framework bodies, and is removed after the filling earth and sand has solidified. Construction method of steel frame embankment body. 4. The method for constructing a steel frame embankment body according to any one of claims 1 to 3, wherein the filling material is compacted within the framework. 5 In an embankment-like structure in which a framework body assembled by joining iron members is filled with filler material, the filler material is filler material made of currently excavated sand mixed with soil cement, or filler material made of currently excavated sand mixed with soil cement. This is a sand bag that has been cured with cement mixed in.The above-mentioned filling earth and sand is packed between grain extrusion prevention materials stretched on each side of the framework body in places other than the water passage part, and the filling earth and sand are poured out. A steel frame type characterized in that the soil bag is solidified without flowing out between the blocking materials, and the soil bag is placed inside the framework body at a place such as a water passage where water permeability is required. How to construct an embankment body. 6 In an embankment-like structure in which a framework body assembled by joining iron members is filled with filler material, the filler material is made of water-permeable drainage pine material and soil cement mixed with currently excavated sand. The above-mentioned drainage mat material is installed inside the framework body at the part that is to be the water passage part, while the said filling earth and sand is stretched on each surface of the framework body at parts other than the water passage part. A method for constructing a steel frame type embankment body, characterized in that the surrounding part is filled with the outflow prevention material or the drainage pine material, and the filled earth and sand is solidified without flowing out. 7. A frame dam constructed by the method according to any one of claims 1 to 6. 8. An earth retaining wall constructed by the method according to any one of claims 1 to 6.