JPH08109629A - Construction method of structure such as channel, etc. - Google Patents

Abstract

PURPOSE: To simply construct the channel, a road, etc., in soft ground area by mixing a solidifiable mixture to form solidified walls in the soft ground, and taking out sand-like substance to reuse it after the solidifiable mixture is added to the soft ground between the solidified walls to change them into the sand-like substance. CONSTITUTION: Sheet piles having the width of a levee are provided to soft grounds 4 and 4, and soft soil is excavated at the insides of them to mix the excavated soil with a solidifiable mixture. The soft soil mixture is backfilled in the soft grounds 4 and 4 in accordance with the thickness of a rolled layer. After that, the soft soil mixture is rolled by means of a rammer and is solidified in a certain time. B repeating the same operation, a channel wall with required height is formed. After the sheet piles are removed, the solidifiable mixture is put into the soft ground between solidified walls 23 and 24 to mix and stir. Directly after the stirring, a changed sand-like substance is taken out after its dry state is confirmed, and it is spread on the outsides of the solidified walls 23 and 24. a recess is formed between the solidified walls 23 and 24 and is used for a channel, sand-like substances 31 are spread on both sides of the solidified walls 23 and 24 to form sidewalks.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a structure by using a solidifying mixture, and more specifically, a solidifying mixture is used to solidify soft ground to form a wall-like material. The present invention relates to a method of efficiently converting a soft ground between the wall-like materials into a sand-like material and efficiently constructing various uses, for example, a waterway or a road in the soft ground portion.

[0002]

2. Description of the Related Art Conventionally, a cement-based solidifying material is known as a roadbed improving agent because it can improve the roadbed of the road by mixing it with soil generated from the site when paving the road. Also, when conducting road construction work such as sewer construction and gas construction in a neighborhood adjacent to a shopping district or a private house, it prevents the soil dug out from flying up due to wind, etc., and also prevents the soil from flying up during backfilling. For this purpose, cement-based solidifying material is mixed with these soils. Furthermore, other cement-based solidifying materials are used for various applications such as improvement of soft soil such as highly hydrous clay and highly organic soil, sludge, sewage treatment, solidification of industrial waste containing harmful heavy metals, etc. There is.

[0003]

However, although the cement-based solidifying material has hitherto been mainly used as a roadbed conditioner, improvement of soft ground, solidification treatment of industrial waste, scattering prevention material, etc. There was a problem that the water permeability and workability of spreading were not enough, and the reaction was slow and it took time for the effect to appear. Therefore, the inventors of the present invention have focused their research on these problems, and have obtained good water permeability and workability at the time of spreading,
We have found a mixture based on a cement-based solidifying material that can be solidified quickly. Furthermore, a mixture containing this cement-based solidifying material as a main component forms a sandy substance by mixing and stirring with soft ground, and these mixtures can obtain a predetermined water activity and strength by increasing or decreasing the energy during rolling. Based on this finding, the present inventors have established a construction method for the structure of the present invention. Therefore, an object of the present invention is to provide a method for constructing a structure such as a water channel that can easily construct a structure such as a water channel or a spillway in a soft ground area.

[0004]

The respective objects of the present invention are as follows.
The invention is achieved by the following inventions. (1) Mix the solidifying mixture at a predetermined place on the soft ground,
By sufficiently rolling, a solidified wall is formed in the soft ground, the solidified wall is further constructed in a desired portion, and then the solidified mixture similar to the above is added to the soft ground existing between these solidified walls. A method for constructing a structure such as a water channel, characterized in that the soft ground is converted into a sandy material by mixing and stirring, and then the sandy material is taken out and reused in an appropriate place. (2) A part of the soft ground is sampled to form a recess in the soft ground, the solidifying mixture is added to and mixed with the collected soft soil, and the mixture is molded and solidified. Alternatively, a method of constructing a structure such as a water channel, which is characterized by being installed on the bottom. (3) When the structure is a water channel, the sand-like material is laid on both sides of the water channel. (4) Rolling energy of 10 kg · cm / cm ³ to 30
The method for constructing a structure such as a water channel according to any one of the above items 1 to ³ , wherein the method is kg · cm / cm ³ . (5) The water channel according to any one of the above items 1 to 4, wherein the solidifying mixture is composed of an inorganic quick-setting agent, a water-absorbing polymer substance, quicklime and a cement-based solidifying material. Construction method of structure. (6) Any one of the above items 1 to 5, wherein the inorganic quick-setting agent is at least one selected from sodium silicate, potassium silicate, sodium aluminate, and sodium carbonate. Construction method for structures such as waterways described in. (7) The water-absorbing polymer substance is at least one selected from natural polymers, synthetic polymers, or a mixture thereof.
7. The method for constructing a structure such as a water channel according to any one of the above items 1 to 6, which is a seed. (8) The cement-based solidifying material is cement, blast furnace slag,
The method for constructing a structure such as a water channel according to any one of the above items 1 to 6, which is composed of a mixture with slaked lime or at least one selected from gypsum.

The present invention will be described in more detail below. In the method of constructing a structure such as a waterway of the present invention, the solid ground mixture is mixed in a predetermined place of the soft ground and sufficiently compacted to form the soft ground. A solidified wall is formed therein, the solidified wall is further constructed in a desired portion, and then the solidified mixture is added to the soft ground existing between these solidified walls, and the soft ground is formed into a sandy matter by mixing and stirring. After modification, the sandy material is taken out and reused at an appropriate place, or a part of the soft ground is sampled to form a recess in the soft ground, and the softened material is collected. The method is characterized in that after the solidifying mixture is added to the ground and mixed, it is molded and solidified, and the obtained molded and solidified product is installed on the side surface or the bottom surface of the recessed portion. Waterways, ridges, In which an excellent effect of being able to construct a road.

In the method for constructing a structure such as a water channel according to the present invention, the compaction mixture is mixed with the soft ground and then the compaction is performed. The compaction energy is 10 to 30 kg · c.
m / cm ³ , preferably 15 to 25 kg · cm /
It is cm ³ . This compaction energy is 10 kg · cm /
When it is less than ³ cm3, many voids are formed, so that the soil retaining wall has low solidification strength and becomes a brittle wall. Further, when the compaction energy exceeds 30 kg · cm / cm ³ , the solidification strength is not significantly improved, and the compaction time is required, which is meaningless in terms of construction efficiency. Further, the strength of the solidified wall thus obtained is 8 to 15 kgf / cm ² at least 3 hours after the compaction, and can be sufficiently endured as a side wall of a water channel or the like. However, these solidified walls can be covered with concrete if desired. In addition, the blocks of the molded and solidified material provided on the wall surface of the recess of the soft ground may be stacked as they are, or these blocks may be bonded and laminated. In the present invention,
In order to make the soft ground between solidified walls or surrounded by solidified walls into a sandy material, it is necessary to rapidly stir after mixing the soft ground and the solidifying mixture. An object is formed. This soft soil mixture becomes impermeable by rolling and after the soft soil mixture solidifies,
When packed in a bag, it becomes a water-permeable sandbag.

In the present invention, the amount of the solidifying mixture used for solidifying or sand-forming the soft ground is 3% by weight to 30% by weight, preferably 5% by weight to 20% by weight based on the soft ground. %. If the amount of the solidifying mixture with respect to the soft ground is less than 3% by weight, it is difficult to form sand. Further, even if it exceeds 30% by weight, there is no change in the solidification strength, which is economically disadvantageous. The standing time is preferably 30 minutes to 7 days.

The solidifying mixture used in the method of constructing structures such as water channels is composed of an inorganic quick-setting agent, a water-absorbent polymer substance, quicklime and a cement-based solidifying material,
As a result, when mixed with soil, particularly soft soil, it changes into a sandy, free-flowing soil with good water permeability, has high strength, and can solidify more rapidly, which makes it extremely easy to handle. As the cement-based solidifying material, one containing cement as one of its components and further containing at least one substance selected from blast furnace slag, slaked lime or gypsum is preferably used. As the cement, Portland cement, C ₂ S type special cement [2CaO ・ S
The clinker mineral name of iO ₂ (Belit) cement], ultra-rapid hardening cement, calcium sulphoaluminate special cement and the like are preferably used. The inorganic quick-setting admixture used in the present invention has a fast-acting and long-term strength-enhancing effect, that is, it easily reacts with cement to solidify and exhibits quick-setting and initial strength development. As the inorganic quick-setting agent, sodium silicate, potassium silicate, sodium aluminate or sodium carbonate, calcium chloride, magnesium chloride, or the like is preferably used, and water glass is particularly preferable. This water glass has a function of easily reacting with cement to form a silicate gel, and providing quick setting property and initial strength development property. The above-mentioned inorganic quick-setting agents may be used alone or 2
You may use it in combination of 2 or more types.

As the water-absorbing polymer substance used in the present invention, at least one selected from natural polymers, synthetic polymers, or a mixture thereof is used. Hydrolyzate of acrylonitrile graft polymer, starch-based polymer material such as starch-acrylic acid graft polymer, starch-acrylamide graft polymer, cellulose-based polymer material such as cellulose-acrylonitrile graft polymer, polyvinyl alcohol cross-linked polymer, etc. Polyvinyl alcohol compounds, sodium acrylate cross-linked products, polyacrylonitrile polymer saponification products, acrylic polymer materials such as hydroxyethyl methacrylate polymers, maleic anhydride polymer, polyether system, ester system condensation systems, etc. Polymer etc. It is. By adding this water-absorbing polymer substance, moisture is absorbed from soft soil containing moisture and the soil is free-flowing. Furthermore, by adding quick lime and a cement-based solidifying material, the soil can be granulated to change into a sand-like soil and the strength of the sand-like soil can be promoted by the action of the cement-based solidifying material.

In the present invention, the mixing ratio of the inorganic quick-setting admixture, the water-absorbent polymer substance, quick lime and the cement-based solidifying material is 3 parts by weight of the inorganic salt-based quick-setting agent to 100 parts by weight of the cement-based solidifying material.
Parts by weight to 100 parts by weight, preferably 15 parts by weight
50 parts by weight. If the proportion is less than 3 parts by weight, there is substantially no effect, and if it exceeds 100 parts by weight, the cost becomes high for the effect, which is economically disadvantageous. Further, the water-absorbing polymer substance is 0.1 to 10 parts by weight, preferably 0.3 to 5 parts by weight, based on 100 parts by weight of the cement-based solidifying material. If this ratio is less than 0.1 parts by weight, there is no sufficient water absorption effect, and if it exceeds 10 parts by weight, there is no further effect on the water absorption action, which is economically disadvantageous. 10 parts by weight to 4 parts by weight of quick lime with respect to 100 parts by weight of the cement-based solidifying material.
The amount is 00 parts by weight, preferably 40 parts by weight to 250 parts by weight. If this ratio is less than 10 parts by weight, it will be difficult to form a sandy texture, and if it exceeds 400 parts by weight, initial strength development and durability will be impaired, such being undesirable.

The solidifying mixture of the present invention is used as it is. For example, when the solidifying mixture is used by mixing it with soil, the solidifying mixture is added to 100 parts by weight of the soil. Is preferably added in an amount of 3 to 30 parts by weight, more preferably 5 to 20 parts by weight. An alcohol-based compound, an ether-based compound or a hydrocarbon-based compound, particularly liquid paraffin can be added to the solidifying mixture of the present invention when it has a scattering prevention effect. Examples of the alcohol compound and the ether compound include ethylene glycol, diethylene glycol, propylene glycol, triethylene glycol, ethylene glycol dimethyl ether and glycerin. These may be used alone or in combination of two or more kinds. Good.

The amount of the alcohol-based or ether-based compound added is 1 part to 5 parts with respect to the raw materials. The liquid paraffin is a relatively light lubricating oil fraction, for example, a spindle oil fraction, preferably a highly refined hydrocarbon oil, and is mainly composed of alkylnaphthenes. The amount of liquid paraffin added is 1 to 5 parts with respect to the raw material. Further, when the glycol-based compound and liquid paraffin are mixed and used, a further dust scattering prevention effect is obtained, and the mixing ratio is 1: 3 to 3: 1, preferably 3: 1. . The solidifying mixture of the present invention is used for solidifying, carrying out and reusing construction mud by utilizing such effects, and is also used for preventing scattering of soil generated in road construction and refilling it. It is used for soil improvement, ground improvement, sludge improvement, and solidification of industrial waste.

[0013]

[Operation] In the method of constructing a structure such as a waterway of the present invention,
When constructing a structure such as a canal in a soft ground area, in order to form the side wall of this canal, after allowing the solidifying mixture to sufficiently penetrate the surface of the soft ground in the depth direction, leave it under pressure. By doing so, the solidification of the soft ground penetrated by the solidifying mixture is promoted. Further, by mixing and stirring the solidifying mixture with the soft ground, the soft ground is solidified and promotes granulation, so that it becomes a sandy material. The solidifying mixture reacts with the cement-based solidifying material by adding an inorganic quick-setting agent, and brings about initial strength development due to the formation of silica gel. In addition, the hydration reaction of the cement-based solidifying material, calcium silicate by the porazone reaction between the calcium content in the cement-based solidifying material and quick lime, the silica in the soil, and the aluminum content,
Hydrates such as calcium aluminate are formed over a long period of time to enhance the strength and form stable particles against water erosion.
On the other hand, the water-absorptive polymer substance absorbs water from a soft soil containing water to change the liquid soil to a plastic soil. Furthermore, by adding quick lime and a cementitious solidifying material, the soil is further granulated and changed into a dry sandy soil with the above action, and the water permeability is improved.

[0014]

EXAMPLES The present invention will now be described in more detail with reference to examples, but the present invention is not limited to these examples.

Example 1 The following components were mixed to prepare a solidifying mixture used in the construction method of the present invention. Inorganic quick-setting agent: Water glass 25.4 parts Water-absorbing polymer: Water-soluble polymer having a carboxyl group (starch-acrylic acid graft polymer having a molecular weight of 5,000,000 or more) 1.81 parts Quick lime: JIS R9001 1 No. 55 parts Cement-based solidifying material: Stabilite M15 (Mitsubishi Materials Corp., cement-based solidifying material) 100 parts

The above components were thoroughly mixed to prepare a solidifying mixture. FIG. 1 is a cross-sectional view showing a soft ground constructed according to the present invention, and FIG. 2 is a cross-sectional view showing a water channel formed on the soft ground 4 according to the construction method of the present invention, wherein the solidifying mixture is used. Channel 1 constructed in soft ground 4 using
Is. The water channel 1 is constructed in the order shown in FIGS. 3 to 4, and the water channel 1 is shown in a sectional view. FIG. 3A is a cross-sectional view showing an aspect in which solidified walls are formed on both sides to construct a water channel. In FIG. 2, first, sheet piles 61 and 62 having the width of the embankment are installed on the soft grounds 4 and 4 in order to form the solidified walls 23 and 24 which are the embankments on both sides. Then, the soft soil inside the sheet piles 61 and 62 is excavated, and the excavated soft soil is mixed with the solidifying mixture. The mixing ratio of this solidifying mixture is 10 parts by weight with respect to 100 parts by weight of soft ground. The soft soil mixture 54 is backfilled in the soft grounds 4 and 4 according to the layer thickness of the compaction. Then, the soft soil mixture 54 was solidified by applying a compaction pressure P using a rammer (impact type impact energy system). That is, after backfilling the soft soil mixture 54, the compaction energy 25 kg
-Roller 7 and 7 rolled at cm / cm ³ . Three
After a time, the soft soil mixture 54 solidified. As shown in FIGS. 3B and 3C, this operation was repeated to solidify the soft soil mixture 54 to form the water channel wall 51 having a desired height.
As shown in FIG. 4d, after removing the sheet piles 61, 62 from the water channel walls 23, 24, the solidifying mixture 53 similar to the above is put in the soft ground 4 between the solidifying walls and mixed and stirred. . Immediately after the agitation, the soft ground 4 is changed into a free-flowing sand-like material 41 as shown in FIG. 4e, and after confirming this, the sand-like material 41 is taken out and the solidified wall 23,
Lay outside 24 (see arrow). As shown in FIG. 4f, a recess is formed between the solidification walls 23 and 24, which serves as a water channel, and sands 41 are laid on both sides of the solidification walls 23 and 24 to form a sidewalk. To be done. Although the bottom portion of the water channel constructed by the construction method of the present invention is not solidified, a solidified portion 25 may be formed on the bottom portion as shown in FIG.

Example 2 A solidifying mixture prepared similarly to that used in Example 1 was mixed with soft soil to form a solidifying block, as shown in FIG. 6, which was installed on the wall or bottom. And built a waterway. In FIG. 6, the soft ground of the water channel forming portion is taken out, and after the solidifying mixture 53 is added and mixed thereto,
The added mixture is put in a block mold and solidified and compacted at a compaction energy of 25 kg · cm / cm ³ , and the obtained molded solidified product is, as indicated by reference numerals 26, 27 and 28, walls and bottoms of water channels. And the flats on both sides. A cement mortar adhesive may be used to bond the blocks. The canal thus obtained can sufficiently serve as a simple canal.

Example 3 FIG. 7 is a sectional view showing a water channel formed by the method of the present invention. 8 and 9 are cross-sectional views showing a method of constructing a water channel of the present invention, and FIG. 8A shows a sand-like material 31 obtained by mixing and stirring the solidifying mixture 53 with the soft soil 4. ing. Here, soft ground 4 composed of cohesive soil with a water content of 38%
In 8 above, 8% by weight of the solidifying mixture 53 was added to the cohesive soil in the range including the channel width and the backfilling thickness portion 33, and then the mixture was stirred to change the soft ground 4 into the sand-like material 31. Then, as shown in FIG. 8b, the sand-like material 31 is excavated in the width of the waterway to form the waterway 1, and the sand-like material 31 is taken out leaving part of the backfilling portion 33 and the bottom portion 34 and temporarily placed. (32) Next, as shown in FIG. 8c, the outside of the water channel wall is made with sheet pile 61, and then the bottom portion 23 is rolled at a pressure of 20 kg · cm /
The sheet is struck with a pressure of cm ³ to be solidified, and then a sheet pile 63 is provided on the inner side to form a side wall, and the sandy material 31 temporarily placed (32) is filled therein and compacted. This side wall is manufactured by tamping the sandy material 31 with a rammer at a thickness of 10 cm each at a rolling pressure energy of 20 kg · cm / cm ³ to a predetermined height.

FIG. 9 shows that a side wall frame of a water channel is formed using sheet piles 61, 62, 63 and 64, and a sand-like material 31 is filled in the side wall frame, followed by rolling. Drain holes 22 are provided here and there to drain the permeated water that has passed through the backfill material and at the same time, reduce the earth pressure on the back surface of the side wall. Finally, after filling the voids in the back-filling portion with the sand-like material 31, the sand is laid on the side of the waterway to form the waterway 35 having a structure as shown in FIG. At the side wall and the bottom of the water channel thus obtained, the strength of the improved soil after 3 hours from rolling was 10 kgf / cm ² , and that after 28 days of curing was 32.
It was kgf / cm ² and showed a value equivalent to that of sand. Further, FIG. 10 is a cross-sectional view showing a construction in which sandbags 56 are piled up on the bottom and side walls of the water channel, and the sandbags 56 are packed with the sand-like material 31 before being solidified to be impermeable by being rolled. None, a drain hole 22 is provided. Even if the space between the sandbags is reinforced with cement mortar, good water permeability is maintained.

[0020]

The method for constructing a structure such as a water channel of the present invention is
Since the solidifying mixture is permeated into the soft ground and then the structure is constructed by compacting by compaction, not only the initial strength of the solidified product is large but also an excellent reinforcing effect is obtained after a long period of time. In addition, since the soft ground can be granulated to form a dry sandy material, this sandy material can be easily taken out after the formation of the concave portion, and the sandy material after excavation is further discarded without further disposal. It is used to make sidewalks and driveways by laying it in the backing materials and beside waterways. Further, the method for constructing a structure such as a water channel of the present invention is such that when a solidified mixture is mixed with soft ground to form a molded solidified product, this is installed in a concave portion of the soft ground, that is, a side surface and a bottom surface. By doing so, it is possible to easily construct a water channel such as a recess in a soft ground area.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of soft ground constructed by using the method for constructing a structure such as a waterway according to the present invention.

FIG. 2 is a sectional view of a water channel constructed using the method for constructing a structure such as a water channel of the present invention.

FIG. 3 is a cross-sectional view showing a method of constructing a structure such as a water channel according to the present invention, in which a indicates that the side wall is compacted by rolling, b indicates that the side wall is completed, and c indicates b. It is sectional drawing which shows the place which is rolling the side wall shown by.

FIG. 4 is a cross-sectional view showing a method of constructing a structure such as a waterway of the present invention following FIG. 3, where d indicates that the solidifying mixture is added to soft ground, and e indicates mixing after addition. The agitation shows the sandy material, and the letter f shows the excavation of the sandy material placed on the side of the waterway to form a road.

FIG. 5 is a cross-sectional view showing a state in which the bottom of the water channel is also solidified by the method of the present invention.

FIG. 6 is a sectional view showing a water channel of another embodiment in which a molded solidified product is used in the method of the present invention.

FIG. 7 is a cross-sectional view showing a water channel of still another embodiment in which a molded solidified product is used in the method of the present invention.

FIG. 8 is a cross-sectional view of a water channel constructed in another embodiment of the method for constructing a structure such as a water channel according to the present invention, in which a is a sandy material obtained by adding a solidifying mixture and mixing and stirring the mixture. Show, b
Shows a part excavated and temporarily placed, and c shows a part solidified by compaction in the waterway formation part.

9 is a cross-sectional view showing a water channel constructed by the method of FIG.

FIG. 10 is a cross-sectional view showing a water channel of still another embodiment using a sandbag bag filled with a molded and solidified product by the method of the present invention.

[Explanation of symbols]

 1 Water Channel 12 Recessed Part 21 Solidified Part 22 Drainage Pipe 23, 24 Solidified Wall 25 Solidified Material at Bottom 26, 27, 28 Molded Solidified Material 31 41 Sandy Material 32 Sandy Material Temporary Place 33 Backfilled Part 34 Bottom 35 Sandy Material Sidewalk 4 Soft ground 51, 52 Soft soil mixture 53 Solidifying mixture 54 Rolling compaction of soft soil mixture 56 Sandbags 61, 62 Frame or sheet pile P Rolling compaction

Claims (8)

[Claims] 1. A solidifying wall is formed in the soft ground by mixing the solidifying mixture at a predetermined place of the soft ground and rolling the mixture sufficiently, and then the solidifying wall is constructed at a desired portion, and then these solid walls are formed. A solidifying mixture similar to the above is added to the soft ground existing between the solidification walls, and the soft ground is converted into a sandy material by mixing and stirring, and then this sandy material is taken out and reused at an appropriate place. A method for constructing a structure such as a water channel characterized by the above. 2. A part of the soft ground is sampled to form a recess in the soft ground, and a solidifying mixture is added to and mixed with the collected soft soil, followed by molding and solidification. A method of constructing a structure such as a waterway, which is characterized by being installed on the side or bottom of the building. 3. The method for constructing a structure such as a water channel according to claim 1 or 2, wherein when the structure is a water channel, the sandy material is laid on both sides of the water channel. 4. The rolling energy is 10 kg.cm/cm.
Construction method of a structure canals of claim 1 to claim 3, characterized in that a ^{3 ~30kg} · cm / cm ^3. 5. The water channel according to any one of claims 1 to 4, wherein the solidifying mixture comprises an inorganic quick-setting admixture, a water-absorbing polymer substance, quick lime, and a cement-based solidifying material. Construction method of. 6. The inorganic quick-setting agent is sodium silicate, potassium silicate,
The water channel according to any one of claims 1 to 5, which is at least one selected from sodium aluminate, sodium carbonate, and inorganic chlorides such as calcium chloride and magnesium chloride. Construction method of structures such as. 7. The water-absorbing polymer substance is at least one selected from natural polymers, synthetic polymers, or a mixture thereof.
A construction method for a structure such as a waterway according to any one of 1. 8. The cement-based solidifying material comprises a mixture of cement and at least one selected from blast-furnace slag, slaked lime, and gypsum, according to any one of claims 1 to 7. Construction method for structures such as waterways.