JP6749809B2 - Weir and construction method of weir - Google Patents

Description

The present invention relates to a dam using fluidized soil cement and a method of constructing a dam.

Conventionally, in mountain control work and erosion control work, etc., an INSEM method that builds a civil engineering structure for mountain control and erosion control by agitating locally generated earth and sand and cement powder with a backhoe (power shovel) and compacting with a compaction roller The ISM method is used to stir and mix locally generated soil and cement milk with a heavy machine equipped with a backhoe or twin-head stirring device to improve the ground and construct a civil engineering structure for mountain control and erosion control. Are known.

Among them, in the ISM method, the soil of the foundation ground is rock-mixed and mixed with cement milk to be solidified as soil cement to improve the ground, or the local soil and cement milk are mixed and poured into the formwork to control the soil. Construction work is being done by building structures for erosion control.

Soil cement for ground improvement or construction of civil engineering structures used for such ISM construction is required to have high fluidity from the viewpoint of workability due to the particle size and water content of the local earth and sand, and has a high water-cement ratio. The present situation is that fluidized soil cement with a slump value of about 20 cm or more is used by mixing local milk with cement milk.

However, when the slump value is high, there is a problem that during the severe winter, the excess water expands due to freezing and cracks occur in the dam cement made of soil cement. Further, when the slump value is high, there is a problem that the soil cement also undergoes dry shrinkage even in the summer and cracks occur in the dam.

As described above, if the surplus water in the soil cement is large, there is a high possibility that a quality problem will occur, and it is an issue to reduce the surplus water from the soil cement as much as possible while ensuring the workability. However, at the site of construction work for mountain control and erosion control, priority is given to the workability, that is, the fluidity of soil cement, and it is not known at present how much surplus water is generated. is there.

For this reason, if cement milk with a low water-cement ratio is mixed with local earth and sand so that excess water does not come out even if the threshold of water content is unknown, fluidity will be impaired and the workability will be remarkably inferior. There is a problem that it is difficult or impossible to construct.

Further, Patent Document 1 discloses a concrete pouring method in which a plate material having water permeability and air permeability is attached to a frame material having high strength to assemble a formwork, and concrete is placed inside the formwork. (See the claims of Patent Document 1).

According to the concrete pouring method described in Patent Document 1, since the concrete has a high water-cement ratio and high fluidity at the time of pouring, workability is good and excess water that does not undergo a hydration reaction after pouring is eliminated. Therefore, it is possible to provide a high-quality concrete structure. However, this is a method of placing concrete in which aggregates such as fine aggregates are specified, and it cannot be directly applied to soil cement using local earth and sand whose composition is not specified. In particular, the concrete pouring method described in Patent Document 1 fills the frame with highly fluid concrete, but the drainage point is only a water-permeable wall, and can be applied to a thin structure such as a retaining wall. However, with a structure such as a dam, excess water of concrete near the surface of the dam can be removed, but since water inside the dam cannot be drained, there are two qualities: a surface with less excess water and an interior with more excess water. There was a problem that the material was completed and the important integration as a dam could not be secured.

Further, in Patent Document 2, a highly fluidized mortar having a water-cement ratio of 65 to 80% is pumped into a fabric formwork to reduce the amount of cement used and material separation while ensuring fluidity. A method for molding a highly fluidized mortar using a cloth mold has been disclosed (see claims, etc. of Patent Document 2).

However, the molding method for high-fluidity mortar described in Patent Document 2 relates to a mortar with a limited fine aggregate although it is possible to secure the fluidity of conventional mortar by suppressing material separation and breathing. It was not applicable to chemical soil cement. Moreover, it is also known that when mortar is cast on a cloth form, excess water unrelated to the hydration reaction oozes out from the cloth, resulting in an improved water-cement ratio and a higher expression strength. However, the gravity of the mortar, which has not solidified yet, acts on the cloth formwork as a pressure, so the cloth formwork cannot have a large cross section, and the thickness is limited to about 30 cm, making it a tall structure. Has a problem that it cannot be used as it is. In particular, the method for molding high-fluidization mortar described in Patent Document 2 is intended for aggregates whose particle size is strictly adjusted, and in soil cement using locally-generated earth and sand, mixing of fine-grained earth and sand is common and strict. There was a problem that the grain size could not be adjusted.

JP 62-288259 A JP-A-63-64950

Therefore, the present invention has been devised in view of the above-mentioned problems, and the purpose thereof is to utilize the local earth and sand of the construction site and to use a fluidized soil cement having high fluidity at the time of filling to improve the It is to provide a method for constructing a weir using fluidized soil cement and a weir that can construct a weir exceeding 30 cm and remove excess water after filling.

The dam according to the first aspect of the invention is a dam for preventing topographical deformation such as debris flow and landslide due to weight, and a steel frame in which steel strips are combined, and a plurality of entrainment prevention attached to the steel frame. Material and soil cement in which the local earth and sand of the construction site is hardened with cement milk, and the soil cement is filled in a cloth formwork and loaded into the space formed between the plurality of anti-scattering materials. The steel strip is formed with grooves or cavities for draining excess water that has exuded from the cloth mold.

The dam according to the second invention is characterized in that, in the first invention, the steel strip is installed so as to be inclined so as to descend in a direction of draining excess water.

A dam according to a third invention is characterized in that, in the first invention or the second invention, at least one surface of the cloth mold is in contact with the anti-separation material and the cloth molds are separated from each other.

A dam according to a fourth invention is characterized in that, in any one of the first to third inventions, the steel strip is a shaped steel in which a web is installed as a bottom surface of the groove.

A dam according to a fifth invention is characterized in that, in any one of the first to third inventions, the steel strip is a steel pipe in which the inside of the pipe is the hollow and a large number of holes are formed on the surface. And

A dam according to a sixth invention is characterized in that, in the fifth invention, the steel pipe is a culvert partially buried in the ground and also serves as a drainage pipe for draining to the outside.

A dam construction method according to a seventh aspect of the present invention is a dam construction method for preventing topographical deformation such as debris flow or landslide due to weight, and is a steel frame construction step of assembling steel strips to construct a steel frame. , The anti-separation material installation process of installing a plurality of anti-seizure materials on the steel frame, and adding fluidized cement milk with a higher water-cement ratio than the mix design to the local soil at the construction site to agitate the fluidized soil cement. A fluidized soil cement manufacturing step for producing, a soil cement filling step of filling the fluidized soil cement into a cloth formwork, and a plurality of the entrainment prevention materials for lifting the filled fluidized soil cement together with the cloth formwork A cloth form frame loading step of loading in a space formed between the grooves, the excess water of the fluidized soil cement is exuded from the cloth form frame, and a groove formed in the steel frame or The surplus water is drained through the cavity.

In the method for constructing a dam according to an eighth invention, in the seventh invention, in the cloth form frame loading step, one surface of the cloth form frame abuts against the anti-separation material so that the cloth form frames are separated from each other, The cloth molds may be loaded in one or two rows in the space.

A method for constructing a dam according to a ninth invention is the seventh or eighth invention, wherein in the steel frame construction step, the groove or the cavity is inclined so as to descend in the drainage direction to construct the steel frame. It is characterized by

The method for constructing a dam according to a tenth invention is the invention according to any one of the seventh invention to the ninth invention, wherein in the cloth form frame loading step, excess water seeps out from the cloth form frame loaded in the space. After the above, or after the hydration reaction of the fluidized soil cement is started and a predetermined strength is developed, a cloth frame above the cloth frame is loaded.

According to the first invention to the sixth invention, since the groove or cavity for draining the excess water that has exuded from the cloth mold is formed in the steel strip, after filling the soil cement through this groove or cavity. Excess water that does not participate in the hydration reaction can be eliminated. That is, it is possible to construct a dam exceeding 30 cm in height by using the fluidized soil cement having high fluidity at the time of filling by using the local earth and sand at the construction site, and to eliminate the excess water after the filling. Further, since fluidized soil cement having a high water-cement ratio and high fluidity is used at the time of filling, workability (workability) of filling the soil cement is good. For this reason, it is possible to provide a high-quality and durable dam which has no cracks due to dry shrinkage or freezing and no cross-section loss due to defective placement, and has a predetermined strength that can prevent precipitation and erosion of wind and snow.

In particular, according to the second aspect of the invention, the steel strip is installed so as to be inclined so as to descend in the direction of draining the excess water, so that the excess water and precipitation can be drained quickly without accumulating. .. Therefore, it is possible to suppress the propagation of various bacteria and bow hula, and the environment around the dam becomes hygienic.

In particular, according to the third aspect of the present invention, since at least one surface of the cloth mold is in contact with the anti-separation material and the cloth molds are separated from each other, excess water is prevented from seeping out from the cloth mold. There is no danger of Therefore, there is no fear that the hydration reaction will be hindered by excess water, and a dam with high quality and durability can be provided.

In particular, according to the sixth aspect of the invention, it is not necessary to separately provide a drainage pipe for draining to the outside, and the cost can be reduced.

According to the seventh invention to the tenth invention, it is possible to construct a dam exceeding 30 cm in height by using fluidized soil cement having high fluidity at the time of filling, using the local earth and sand at the construction site, and after filling. Excess water can be eliminated. Further, since fluidized soil cement having a high water-cement ratio and high fluidity is used at the time of filling, workability (workability) of filling the soil cement is good. For this reason, it is possible to provide a high-quality and durable dam which has no cracks due to dry shrinkage or freezing and no cross-section loss due to defective placement, and has a predetermined strength that can prevent precipitation and erosion of wind and snow.

Particularly, according to the eighth aspect, in the cloth form loading step, the cloth molds are placed in the space so that one surface of the cloth form abuts against the anti-separation material and the cloth molds are separated from each other. Since it is loaded in one or two rows, there is no fear that excess water will be prevented from seeping out of the cloth form. Therefore, there is no fear that the hydration reaction will be hindered by excess water, and a dam with high quality and durability can be provided.

In particular, according to the ninth aspect, in the steel frame construction step, since the steel frame is constructed by inclining the grooves or cavities so as to descend in the drainage direction, it is possible to quickly drain the excess water and precipitation without accumulating. can do. Therefore, it is possible to suppress the propagation of various bacteria and bow hula, and the environment around the dam becomes hygienic.

In particular, according to the tenth aspect, in the cloth formwork loading step, after exudation of excess water from the cloth formwork loaded in the space is completed or the hydration reaction of the fluidized soil cement is started, the predetermined strength is obtained. After the expression, the upper fabric cloth form is loaded, so that there is little risk that the lower fabric formwork frame will burst under the pressure of the weight of the upper soil cement, and the dam can be constructed safely. Further, it is possible to prevent the soil cement portion from being partially crushed and hardened as it is at the time of construction, and it is possible to provide a dam with high quality and durability.

It is the perspective view which showed typically the dam which concerns on embodiment of this invention. It is a perspective view showing only a steel frame of the above dam. It is a perspective view which shows the steel strip material which comprises a steel frame same as the above. It is a perspective view which shows the modification 1 of the steel strip material same as the above. It is a perspective view which shows the modification 2 of the steel strip material same as the above. It is a perspective view which shows the modification 3 of the steel strip material same as the above. It is a perspective view which shows the modification 4 of the steel strip material same as the above. It is a perspective view mainly showing the entrapment prevention material of the above dam. It is a flow chart which shows each process of the construction method of the dam according to the embodiment of the present invention.

Hereinafter, a dam and a method of constructing a dam according to an embodiment of the present invention will be described in detail with reference to the drawings.

[dam]
First, a dam according to the embodiment of the present invention will be described with reference to FIGS. 1 to 8. FIG. 1 is a perspective view schematically showing a dam 1 according to this embodiment, and FIG. 2 is a perspective view showing a steel frame 2 of the dam 1.

As shown in FIG. 1, a dam 1 according to an embodiment of the present invention includes a steel frame 2, a plurality of anti-separation materials 3 attached to the steel frame 2, and the local earth and sand at the construction site is cement milk. It is composed of hardened soil cement 4 and the like. The dam 1 according to the present embodiment is used for mountain protection, erosion control, retaining walls, or revetments, and has a function of preventing topographic deformation such as debris flow or landslide due to its weight.

(Steel frame)
As shown in FIG. 2, the steel frame 2 is a frame body in which steel materials 20, which are steel strips, are vertically and horizontally combined in a jungle gym shape according to the purpose of the dam 1 and the topography of the construction site. .. The steel frame 2 has a function of supporting the cloth formwork so that the entire shape can be maintained even when a cloth formwork described later filled with uncured soil cement is inserted. ..

FIG. 3 is a perspective view showing the steel material 20 according to the present embodiment. The steel material 20 according to the present embodiment is made of a general steel pipe material such as a square steel pipe for machine structure (STKMR 400) and a square steel pipe for structure (STKR 400), and as shown in FIG. It is a rectangular steel tube with a rectangular cross section that has been subjected to rust prevention treatment. The steel material 20 has a large number of water collecting holes h1 for collecting surplus water on its outer peripheral surface, and a hollow h2 inside the pipe serves as a hollow for draining surplus water.

In addition, as shown in FIG. 2, a steel material 20′, which is a beam along the X direction in which the axial direction is the drainage direction, has the same configuration as the steel material 20 except that the cavity h2 is inclined in the X direction. It is installed so that it goes down as it goes to. This inclination angle may be an inclination angle capable of draining excess water, but generally, an inclination angle of about 3/100 or more is required as a water gradient. The steel material 20 ′ may be connected to a drainage pipe (not shown) for draining the steel material 20 ′ to the outside of the dam 1, which is a culvert partially buried in the ground. By doing so, it is not necessary to separately provide a drainage pipe for draining to the outside, and the cost can be reduced.

In addition, as a modification of this steel material 20, the steel material as shown in FIGS. 4-7 is mentioned. That is, the steel strip according to the present invention is not limited to the square steel pipe having the square cross section like the steel 20, but the steel 21 made of the rectangular steel pipe having the rectangular cross section as shown in FIG. 4 and the steel strip 21 shown in FIG. A steel pipe 22 having a cross-sectional shape different from that of the steel product 20, such as a steel product 22 made of such a circular steel pipe, may be used.

Further, the steel strip material according to the present invention includes a steel material 23 made of H-shaped steel or I-shaped steel as shown in FIG. 6, a steel material 24 made of channel steel or lip channel steel as shown in FIG. A shaped steel having a groove may be used. In short, the steel strip according to the present invention may be a steel strip that is long in the axial direction.

Although a circular hole has been illustrated as the water collecting hole h1 in the above, it may be a hole having another shape such as a long hole h3 (see FIG. 4) that is long in the horizontal direction or a rectangular hole (not shown). Absent. In short, the water collecting hole may have any shape as long as it is a hole penetrating the pipe thickness of the pipe material. Further, if the steel strip as shown in FIGS. 6 and 7 is a shaped steel having a groove portion whose bottom surface is an unclosed web, it is not necessary to provide a water collecting hole through which excess water permeates. .. However, it goes without saying that the water collecting holes may be provided even in the case of a shaped steel having a groove.

(Stick prevention material)
FIG. 8 is a perspective view mainly showing the entrapment prevention material 3 of the dam 1. The anti-seizure member 3 is a member having a function of preventing the cloth form frame from encroaching, and as shown in FIG. 8, the anti-seizure member 3 according to the present embodiment is a rolled steel material for welded structure (SM400. ) Or rolled steel for general structure (SS400), etc., is a steel rod having a circular cross section.

Needless to say, the cross-sectional shape of the anti-seizure material according to the present invention may be rectangular, polygonal, or tubular such as square pipe and round pipe. Further, the anti-scattering material according to the present invention is not limited to round steel, but may be a deformed steel rod, a flat plate attached with a gap, a grating lid material, or the like. In short, the anti-seizure material according to the present invention prevents the cloth form from sticking by coming into contact with the cloth form, and can secure a space in which excess water seeps out by separating the cloth forms from each other at that portion. Any steel material having a predetermined bending strength may be used.

(Cloth formwork)
The cloth formwork according to the present embodiment is a bag body obtained by sewing cloth into a futon shape, and is filled with soil cement described later, until the soil cement is cured, while maintaining a predetermined shape, the cloth It has a function of exuding and eliminating excess water that is not related to hydration reaction from the gap (see Fig. 1).

Of course, the cloth mold according to the present invention is not limited to the bag-shaped one of the embodiment, and may be a cloth-made bag-shaped or box-shaped one formed by weaving or knitting a fibrous material. It may be a non-woven fabric.

(Soil cement)
The soil cement 4 according to the present embodiment is a fluidized soil cement in which high-fluidity cement milk mixed in a water cement ratio higher than the cement ratio of the compounding design is mixed with the local earth and sand at the construction site. This is because if the fluidity is high, the workability such as the work of filling the fabric formwork is improved, and it is less likely that defective placement will occur.

As described above, since the soil cement 4 according to the present embodiment uses the local earth and sand, the amount of residual soil generated during construction can be significantly reduced. Therefore, it is possible to eliminate or drastically reduce the cost of disposing of the remaining soil such as renting the land for disposal of the remaining soil. Further, it is possible to reduce the cost of carrying out the residual soil and the cost of carrying in new materials such as aggregate such as concrete. Moreover, the work period can be shortened by reducing the loading and unloading of materials. Therefore, the construction cost of the dam 1 can be significantly reduced.

Here, the cement milk used for the soil cement 4 is a mixture of ordinary Portland cement powder mixed with water by stirring with a mixer or a mixing rod. As a matter of course, the cement added to the cement milk may be a poorly soluble and highly alkaline powder that elutes calcium hydroxide (Ca(OH) ₂ ) and hardens by hydration reaction with water. For example, as the cement, various portland cements such as normal, early strength, moderate heat, ultra-rapid strength, and low heat, various mixed cements obtained by mixing fine particles such as fly ash and blast furnace slag with these portland cements, and fine particle cement are used It is also possible.

In addition, this cement milk contains a retarder, dispersant, retention agent depending on the geology of the local earth and sand, the status of work such as mountain control work and erosion control, and other uses such as hexavalent chromium control, early improvement, and measures for harmful substances. It goes without saying that various admixtures such as agents, superplasticizers, or water reducing agents may be mixed.

<Operation and effect of dam according to the embodiment>
According to the dam 1 according to the embodiment described above, the steel material 20 which is the steel strip material of the steel frame 2 is formed with the cavity h2 for draining the excess water that has exuded from the fabric form frame. Excess water that is not involved in the hydration reaction can be removed after filling the soil cement 4 through the hollow h2.

Further, according to the dam 1, the steel frame 2 and the anti-scattering material 3 support the cloth formwork filled with the soil cement 4 before being hardened. Therefore, by utilizing the local earth and sand at the construction site, It is possible to construct a dam with a height of more than 30 cm by using fluidized soil cement that has good workability and has good workability. Moreover, since the cloth molds are separated from each other by contacting at least one surface of the cloth molds with the anti-separation material 3, excess water may be prevented from seeping out of the cloth molds. There is no. Therefore, there is no fear that the hydration reaction will be hindered by excess water, and a dam with high quality and durability can be provided.

Further, according to the dam 1, since the fluidized soil cement having a high water-cement ratio and high fluidity is used at the time of filling the cloth form, the workability (workability) of filling the soil cement is good.

Moreover, according to the dam 1, as described above, the surplus water can be drained after the soil cement is filled into the cloth formwork, so that there is no cracking due to drying shrinkage or freezing and no cross-section loss due to poor placement, and there is no precipitation or wind and snow. It is possible to provide a high-quality and durable dam that exhibits a predetermined strength capable of preventing erosion of

Further, according to the dam 1, due to the inclination of the steel material 20', excess water and precipitation can be quickly drained without accumulating. Therefore, it is possible to suppress the propagation of various bacteria and bow hula, and the environment around the dam becomes hygienic.

[Building method of dam]
Next, a method of constructing a dam according to the embodiment of the present invention will be described with reference to FIGS. 9, 1, 2, and 8. The case of constructing the dam 1 described above by the method of constructing a dam according to the present embodiment will be described. FIG. 9: is a flowchart which shows each process of the manufacturing method of the fluidized soil cement which concerns on 1st Embodiment of this invention.

(1) Steel Frame Construction Step First, as shown in FIG. 9, in the method of constructing a dam according to the present embodiment, a steel frame construction step of constructing the steel frame 2 by assembling the above-mentioned steel materials 20 is performed. Specifically, as shown in FIG. 2, the steel material 20 is cut to an appropriate length according to the design drawing of the dam 1, and the water collecting hole h1 is preliminarily drilled, and the steel material 20 is carried into the construction site, and these are moved up and down. The steel frame 2 is assembled by welding and joining the left and right sides.

At this time, the steel material 20', which is a beam material along the X direction, is attached by inclining at the above-described predetermined angle so that the hollow h2 descends as it advances in the drainage direction (X direction). In addition, a drain pipe for extending the lower end of the steel material 20 ′ and draining it to the outside of the dam 1 is connected to form a culvert.

(2) Anti-scattering material installation step Next, in the dam construction method according to this embodiment, as shown in FIG. 9, a plurality of anti-scattering materials 3 are installed on the steel frame 2 constructed in the previous step. Perform the anti-sticking material installation process. Specifically, as shown in FIG. 8, an anti-seizure material 3 made of round steel is bridged between two steel materials 20 installed on the upper and lower sides of the steel frame 2 to form the steel material 20 and the anti-seizure material 3. Attach by attaching fillet welding at the contact area with. Repeating this operation, a plurality of anti-seizure materials 3 are attached to the steel frame 2 at a predetermined horizontal interval, and a space A for inserting the cloth form frame surrounded by the anti-seizure material 3 and the excess water flow. A space B, which is a water space, is formed.

It should be noted that the joining of the steel materials 20 described above and the joining of the steel frame 2 (steel material 20) and the entrapment prevention material 3 are not limited to welding, and other joining methods such as bolt joining may be used. Not too long.

(3) Fluidized soil cement manufacturing process Next, in the method of constructing a dam according to the present embodiment, as shown in FIG. 9, cement milk is added to the local earth and sand at the construction site and stirred to produce fluidized soil cement. Perform the fluidized soil cement manufacturing process.

Specifically, a water-cement ratio that is higher than the water-cement ratio of the compound design of the dam 1 is set, and the cement addition amount is determined so that the water-cement ratio is obtained, and cement milk is prepared. After that, the amount of local earth and sand necessary for constructing the dam 1 is agitated with a mixer, a mixing rod, etc. and kneaded dry, and then the prepared cement milk is gradually added while agitating similarly to increase the water-cement ratio. Manufacture fluidized soil cement with high fluidity.

Here, the local earth and sand refers to the earth and sand locally generated due to excavation or the like at the construction site such as mountain control work and erosion control work, and the earth and sand as it is in the naturally accumulated local strata.

In addition, as mentioned above, this cement milk contains a delaying agent depending on the geology of the local earth and sand, the status of construction work such as mountain control work and erosion control, and other uses such as hexavalent chromium control, early improvement, and harmful substance control. Various admixtures such as a dispersant, a holding agent, a fluidizing agent, or a water reducing agent may be mixed.

(4) Soil Cement Filling Step Next, in the method for constructing a dam according to the present embodiment, as shown in FIG. 9, a soil cement filling step of filling the above-mentioned cloth mold with the fluidized soil cement produced in the previous step. I do.

Specifically, the fluidized soil cement is poured from the open end of the futon-like bag to be filled, and the open end is bound and closed. At this time, since the soil cement 4 is a fluidized soil cement having a high water-cement ratio and high fluidity, it can be poured into the bag body, and the workability (workability) of filling the soil cement is increased at each stage. It will be good.

(5) Fabric Form Loading Step Next, in the method for constructing a dam according to the present embodiment, as shown in FIG. 9, the fluidized soil cement filled in the fabric form in the previous step is lifted together with the fabric form. Then, a cloth form-frame loading step of loading the space into the space A formed between the plurality of anti-separation materials 3 is performed.

Specifically, as shown in FIG. 1 and FIG. 8, a cloth mold filled with fluidized soil cement is lifted by a lifting device such as a crane, and a line or a space is formed in the space A of the steel frame 2. Load in two rows. The cloth molds are loaded in one row or in two rows so that one surface of the cloth molds is brought into contact with the anti-separation member 3 so that the cloth molds are separated from each other in the space B by a certain distance. This is because if three or more rows of cloth molds are loaded in the space A, the cloth molds on the inner side and the outer side are brought into close contact with each other, and a cloth mold cannot be secured in which excess water seeps out from the cloth mold.

(6) Excess water drainage step Next, in the dam construction method according to the present embodiment, as shown in FIG. 9, excess water of the soil cement 4 is exuded from the cloth formwork loaded in the space A in the previous step. Then, a surplus water drainage step of draining surplus water through the cavity h2 formed in the steel frame 2 is performed.

Specifically, after loading a cloth mold filled with soil cement 4 which is not yet solidified in the space A in the previous step, the cloth mold is left for a predetermined period of time (hours), and excess water that does not contribute to the hydration reaction is weighted by the cloth mold. It waits until the soil cement 4 develops a strength that does not rupture the lower fabric mold even if a fabric mold is loaded above the fabric mold loaded as the next layer. By leaving it for a predetermined period of time, the excess water that has exuded from the cloth form is discharged through the space B and the cavity h2.

(7) Upper-layer cloth mold loading step Next, in the dam construction method according to the present embodiment, the flow filled in the cloth mold as the upper layer is placed on the cloth mold loaded in the front cloth mold loading step. A cloth form frame loading step is performed in which the chemical soil cement is lifted together with the cloth form frame and loaded into the space A formed between the plurality of anti-scattering materials 3.

This process starts when the soil cement 4 in the lower fabric form has sufficient strength to prevent the fabric form from bursting even when the same weight of soil cement 4 is placed on the upper part of the fabric form. Judge by whether or not. This judgment may be made simply by hitting the soil cement 4 in the lower layer with a hammer or the like to determine how the recesses are formed, or the age of the soil cement 4. In short, this step is performed after the hydration reaction of the fluidized soil cement in the lower fabric mold is started and the predetermined strength is developed.

Further, it may be determined that the predetermined strength is exhibited at the time when the exudation of excess water from the lower fabric mold is completed. The exudation of excess water is completed because the hydration reaction proceeds to some extent and a certain level of strength development is observed.

Thus, since the upper cloth mold is loaded after the strength of the soil cement 4 in the lower cloth mold has developed, the lower cloth mold may burst under the pressure of the weight of the upper soil cement. It is possible to construct a dam safely with less. Further, it is possible to prevent the soil cement portion from being partially crushed and hardened as it is at the time of construction, and it is possible to provide a dam with high quality and durability.

By repeating the above-described (5) cloth form frame loading step and (6) surplus water drainage step, and loading the cloth form frame up to near the upper end of the steel frame 2, the method for constructing a dam according to the present embodiment is realized. finish.

<Operation and effect of the method of constructing a dam according to the embodiment>
According to the method of constructing a dam according to the embodiment described above, it is possible to construct a dam having a height of more than 30 cm by using the fluidized soil cement having high fluidity at the time of filling by using the local earth and sand at the construction site. Moreover, excess water can be removed after filling. Further, since fluidized soil cement having a high water-cement ratio and high fluidity is used at the time of filling, the workability (workability) of filling the soil cement is good. For this reason, it is possible to provide a high-quality and durable dam which has no cracks due to dry shrinkage or freezing and no cross-section loss due to defective placement, and has a predetermined strength that can prevent precipitation and erosion of wind and snow.

According to the method of constructing a dam according to the embodiment, the cloth molds are arranged in one or two rows in the space A so that one surface of the cloth molds abuts against the entrapment preventing material 3 and the cloth molds are separated from each other. Since it is loaded, there is no fear that excess water will be prevented from seeping out of the cloth form. Therefore, there is no fear that the hydration reaction will be hindered by excess water, and a dam with high quality and durability can be provided.

Although the dam and the method of constructing the dam according to the embodiment have been described above in detail, the above-described or illustrated embodiments are merely one embodiment embodied in carrying out the present invention. The technical scope of the present invention should not be limitedly interpreted by these.

1: Dam bank 2: Steel frame 20, 20', 21, 22, 23, 24: Steel material (steel strip material)
h1: Water collecting hole h2: Cavity h3: Long hole 3: Prevention material 4: Soil cement A: Space B: Space

Claims (10)

It is a dam that prevents topographic deformation such as debris flow and landslide due to its weight.
A steel frame that combines steel strips,
Multiple anti-seize materials attached to this steel frame,
Soil cement in which the local soil at the construction site is hardened with cement milk,
The soil cement is filled in a cloth mold and is loaded in a space formed between the plurality of anti-scattering materials,
The dam is characterized in that the steel strip is formed with a groove or a cavity for draining excess water that has exuded from the fabric form. The dam as claimed in claim 1, wherein the steel strip is installed so as to be inclined so as to descend in a direction of draining excess water. The dam basin according to claim 1 or 2, wherein at least one surface of the cloth mold is in contact with the anti-separation material and the cloth molds are separated from each other. The dam according to any one of claims 1 to 3, wherein the steel strip is a shaped steel in which a web is installed as a bottom surface of the groove. The dam as claimed in any one of claims 1 to 3, wherein the steel strip is a steel pipe in which the inside of the pipe is the hollow and a large number of holes are formed on the surface. The dam is according to claim 5, wherein the steel pipe is a culvert partially buried in the ground, and also serves as a drainage pipe for draining the steel pipe to the outside. It is a method of constructing a dam that prevents topographic deformation such as debris flow and landslide due to weight,
A steel frame construction process of assembling steel strips to construct a steel frame,
An anti-separation material installation step of installing and installing a plurality of anti-seizure materials on the steel frame,
A fluidized soil cement manufacturing process that produces fluidized soil cement by adding cement milk with a higher water-cement ratio than the mix design to the local earth and sand at the construction site and stirring the mixture.
A soil cement filling step of filling the fluidized soil cement into a cloth mold,
A cloth mold loading step of lifting the filled fluidized soil cement together with the cloth mold into a space formed between the plurality of anti-separation materials,
A method for constructing a dam, comprising allowing excess water of the fluidized soil cement to exude from the cloth mold and discharging the excess water through a groove or a cavity formed in the steel frame. In the cloth mold frame loading step, the cloth mold frames are loaded in one or two rows in the space so that one surface of the cloth mold frame contacts the anti-separation material and the cloth mold frames are separated from each other. The method for constructing a weir according to claim 7, characterized in that. The dam construction method according to claim 7 or 8, wherein in the steel frame construction step, the groove or the cavity is inclined so as to descend in a drainage direction to construct the steel frame. In the cloth mold loading step, after the exudation of excess water from the cloth mold loaded in the space is completed, or after the hydration reaction of the fluidized soil cement is started and a predetermined strength is developed. The method for constructing a dam according to any one of claims 7 to 9, characterized in that a cloth mold located above the cloth mold is loaded.

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