JP2006200307A - Filler and water cut-off method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filler and a water cut-off method by which a gap formed during or after the filling work can be closed up. <P>SOLUTION: The filler 10 comprises a hardening material 12 composed of water, cement and bentonite compounded to have fluidity, and a water expansive material 11 mixed thereto. After the filler 10 is injected in a space which is in contact with water, and after the hardening material 12 is hardened, the filler 10 is dried and shrunk and a crack 13 is formed. The water expansive material 11 exposed on a surface of the crack 13 absorbs the entering water and expands to close up the formed crack 13. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a filler for filling a space and a water stop method.

Conventionally, in a water stop process of a junction part (joint part) such as a sheet pile, a water stop process for filling the joint part with a grout material (filler) made of a cement-based material has been performed. This is performed in order to prevent groundwater from entering the interior through the joint portion, and the water stoppage state is compensated by the filling pressure of the grout material until the grout material is hardened.
For example, Patent Literature 1 closes the bottom surface of a joint portion connected to a steel pipe sheet pile to be built next, and closes a slit formed in the vertical direction of the joint portion among joint portions provided on both sides of the main body of the steel pipe sheet pile. After the steel pipe sheet pile is installed, the grout material is filled in the joint portion, and then the amount of the grout material corresponding to the volume of the closing member is extracted while the closing member is pulled out. Water stop treatment for additionally filling is disclosed.

Further, in the muddy water solidification treatment in the foundation work (for example, see Patent Document 2) and the backfill work in the open-cut work, the head pressure and grout (muddy water) due to the weight of the grout material (muddy water) until the grout material is hardened. ) Supplements the water stoppage.
JP 2001-355232 A (paragraphs 0008 to 0019, FIG. 3) JP-A-8-260454 (paragraphs 0010 to 0021, FIG. 1)

However, since the sheet pile is in contact with the ground water inside the ground, there is a risk that the sheet pile will be diluted by the ground water until the filled grout material (filler) is cured. In addition, the filling of the grout material may be incomplete.
In addition, in the muddy water solidification treatment in the foundation work and the backfilling work in the open-cut work, there is a possibility that the grout material may be diluted by the groundwater, and the grout material filling may be incomplete.
Further, the cement-type grout material may shrink and dry, which causes a problem that a gap (including cracks) is generated and causes water leakage.

  Therefore, an object of the present invention is to solve the above-described problems and provide a filler and a water stop method that can close a gap generated during filling work or a gap generated after filling.

  In order to solve the above-mentioned problems, the present invention is a filler comprising a hardened material mixed with a water expansion material.

Thus, by mixing the water expansion material into the hardened material, the portion of the water expandable material exposed from the hardened material expands when it comes into contact with a fluid such as moisture, so that the gap generated in the hardened material can be closed. It has become. That is, the water expansion material expands by absorbing moisture such as ground water after the curing material is cured.
Note that the gap includes cracks.

  Further, the present invention is characterized in that the water expansion material is made of any one of urethane, sponge, and nonwoven fabric.

  According to this filler, when a gap is generated due to drying shrinkage or the like after curing by blending a water-swelling material made of any one of urethane, sponge, and non-woven fabric, the surface of the gap is formed. The exposed water expansion material absorbs the invading moisture and expands, thereby closing the generated gap.

  Further, in the present invention, the shape of the water expansion material may be formed in any one of a chip shape, a spiral shape, a string shape, a rod shape, a disk shape, and a spherical shape.

  In this way, when the shape of the water expansion material is formed into any one of a chip shape, a spiral shape, a string shape, a rod shape, a disk shape, and a spherical shape, it becomes easy to mix with the hardening material, so that the hardening material can be manufactured. It becomes easy. Further, when the shape of the water expansion material is as described above, the water expansion material is easily exposed to the surface at the time of cracking due to drying shrinkage or the like after curing of the cured material, so that moisture that has entered the inside of the crack is removed. Easy to absorb. That is, by making the shape of the water expandable material easy to mix with the hardener, it becomes easy to mix with the hardener, and in addition, the water expandable material can be easily exposed to the surface when cracked.

  Moreover, this invention is a water stop method characterized by filling the space part which contact | connects a water | moisture content with the filler in which the water expansion material was mixed.

  In this way, when the water infiltrated by filling the filler in which the water expansion material is mixed into the space portion in contact with moisture, the water expansion material inflates and enters when the water expansion material comes into contact with the water. Can be stopped.

According to such a filler, it is possible to close the gap generated during the filling operation and the gap generated after filling.
Further, according to such a filling method, the water expansion material expands when the water expansion material comes into contact with moisture, and the water entering the gap can be stopped.

  Next, the best mode for carrying out the present invention (hereinafter referred to as “embodiment”) will be described in detail with reference to the drawings.

(First embodiment)
Fig.1 (a) is a top view which shows the state which connected the concrete sheet pile, FIG.1 (b) is a top view which shows an example which filled the filler in the space part formed by connecting a concrete sheet pile. FIG. 2 is a partially enlarged view showing an example of a state in which a space is filled with a filler. FIG. 3A is a schematic diagram illustrating an example of a state in which a gap is generated due to shrinkage of the filled filling material due to drying shrinkage. FIG. 3B is a schematic diagram illustrating an example of a state in which the exposed water expansion material expands in contact with moisture. Fig.4 (a) is sectional drawing which shows the connection state of a steel pipe sheet pile, FIG.4 (b) is the A section enlarged view of Fig.4 (a). FIG. 5 is a cross-sectional view showing a state where a space is filled with a filler.

  The filler 10 according to the first embodiment of the present invention includes a hardening material 12 which is a bentonite mortar composed of water, cement and bentonite so as to have fluidity, and a water expansion material mixed therein. 11. In addition, you may mix aggregates, such as a fine aggregate and a coarse aggregate, in the hardening material 12 as needed. Moreover, what was used conventionally can be used for cement. Moreover, as shown in FIG. 1, this embodiment demonstrates the case where the filler 10 is applied to the concrete sheet pile C, and this concrete sheet pile shall be in the state immersed in the ground water inside the ground, Also, the explanation will be made assuming that the water is groundwater and the gap is cracked.

  The water-expandable material 11 (see FIGS. 3A and 3B) has a physical property that the solidification (curing) of the filler 10 starts and the expansion starts when cracks 13 due to shrinkage or the like start to occur. In this case, since it becomes difficult to start expansion at an early stage (before the curing material 12 is cured), it is possible to prevent the solidity of the filler 10 from being impaired.

The material of the water expansion material 11 is made of any one of urethane, sponge, and nonwoven fabric. By using these materials for the water expansion material 11, the ground water can be easily absorbed after the curing material 12 is cured.
That is, when a crack 13 is generated in the filler 10, the water expansion material 11 is exposed, and groundwater enters the generated crack 13, and as a result, the water expansion material 11 absorbs the groundwater that has entered and expands. To do.

The water expansion material 11 is formed in any one of a chip shape, a spiral shape, a string shape, a rod shape, a disk shape, and a spherical shape.
A plurality of such water expansion materials 11 are mixed when the curing material 12 is kneaded.

Further, the particle size (size) of the water expansion material 11 is preferably a particle size that is dispersed on average without being settled and separated in the hardening material (bentonite mortar) 12.
In this case, when the water expansion material 11 is mixed into the curing material 12, the uneven distribution, the excessively large size, and the “curing material 12” of the water expansion material 11 that cause cracks in the curing material 12 are generated. Problems such as “applying excessive stress” are less likely to occur.

In addition, the total amount of the water expansion material 11 when expanded is, for example, the curing material 12 to such an extent that the volume shrinkage due to breathing or the like of the curing material 12 (for example, 5 vol% in the case of mud solidified material) is slightly more compensated. It is preferable to mix them.
By mixing in this way, generation | occurrence | production of the crack 13 is suppressed and it can improve a water stop property.

  The water expansion material 11 expands by absorbing groundwater (water) without causing a chemical reaction. For example, as a conventional expansion material used for backfilling, an admixture that expands mortar and concrete by producing ettringite, calcium hydroxide, etc. by a hydration reaction that occurs by mixing cement and water is known. The water expansion material 11 mixed with the filler 10 of the present invention is different from this.

Here, the chip shape means an irregular shape obtained by crushing a square bar material, a round bar material or a planar material.
The spiral shape means a state in which a square bar material or a round bar material is wound in a concentric circle.
The string shape means a state that has a predetermined length, has a square or round cross section, and can be bent in the length direction.
The rod shape means a state having a predetermined length, a cross section of a square shape or a round shape, and a straight line.
The disc shape means a state having a predetermined thickness and a circular cross section.

  When the water expansion material 11 is formed in a chip shape, a disk shape, or a spherical shape, when the cracking 13 is generated due to drying shrinkage after the curing material 12 is cured (see FIG. 3A), it is exposed to the entire surface. Since the water expansion material 11 absorbs the invading groundwater and expands (see FIG. 3B), the cracks 13 can be properly closed.

  Further, by forming the water expansion material 11 in a spiral shape, a string shape, or a rod shape, when the cracks 13 are generated by drying shrinkage after curing, the water expansion material 11 exposed by the cracks 13 becomes the cracks 13. Since the invading groundwater is absorbed and expanded, the cracks 13 can be closed accurately.

  For example, as shown in FIG. 1 (a), the filling material 10 of the present invention fills a space S formed by concavities H formed on both sides of a main body of a concrete sheet pile C provided in the ground. Is done.

Since this space S becomes a passage for groundwater in the ground, it needs to be closed.
Therefore, as a water-stopping method, water, cement, and bentonite are kneaded to make a hardener 12, and a water expansion material 11 (see FIG. 3A) is mixed into the hardener 12 to fill the filler 10 of the present invention. And filling the space S with the filler 10 as shown in FIG.

  In the filler 10 made in this manner, the water expansion material 11 absorbs a predetermined amount of moisture (breathing) contained in the curing material 12 before the curing material 12 is cured. It will not be damaged. This filler 10 is filled to every corner of the space S.

  Here, as shown in FIG. 2, when the filler 10 is cured, it is formed into a rod shape having a predetermined diameter. Therefore, when the filler 10 cured in a rod shape is dried and contracted, a plurality of cracks 13 are generated in the radial direction at substantially equal intervals.

  In such a case, as shown in FIG. 3A, the plurality of water expansion materials 11 are exposed on the surface of the cracks 13, and the groundwater enters into the cracks 13. Then, the water expansion material 11 absorbs the groundwater that has entered and expands. The expanded water expansion material 11 can block the cracks 13 (see FIG. 3B) and stop the ingress of groundwater.

Moreover, the filler 10 of this invention is filled in the part which touches a water | moisture content, and is not limited to above-described embodiment.
For example, as shown to Fig.4 (a), space part S formed by fitting the joint part J provided in the side part of the other steel pipe sheet pile K to the joint part J provided in the side part of the steel pipe sheet pile K. As shown in FIG. ′ (See FIG. 4B) may be filled with the filler 10 (see FIG. 5).
Even in such a case, when the hardening material 12 is dried and contracted, a gap is generated between the joint portion J and the filler 10 or cracks are generated in the hardening material 12. Even if this occurs, the water expansion material 11 exposed on the surface absorbs the groundwater that has infiltrated and expands, so that the generated gap can be closed.

(Second embodiment)
As shown in FIGS. 6A and 6B, the filler 10A according to the second embodiment of the present invention is used for the backfilling work in the open-cutting work, and the water-expanding material is added to the fluidized soil 12A as the hardener. 11 differs from the first embodiment in that it is configured by mixing 11.
In this way, by mixing the water expansion material 11 into the fluidized soil 12A, moisture contained in the fluidized soil 12A is absorbed and expanded, so that the backfill is watertight and tightened. it can.

For example, when the filler 10A in which the water expansion material 11 is mixed into the fluidized soil 12A used for backfilling the structure (building foundation, piping, etc.) E at the position buried in the ground is used, FIG. As shown in a), the space 10 around the structure E is filled with the filler 10A.
Therefore, as shown in FIG. 6B, by filling the filler 10A around the structure E, moisture from the structure E is stopped by the filler 10A, or the structure E of groundwater is supplied. Intrusion can be stopped.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment. For example, the water expansion material 11 may be mixed in a fluidizing agent, an acecon, or the like, in addition to a muddy water solidifying material or a mixture of water and cement.

(A) is a top view which shows the state which connected the concrete sheet pile, (b) is a top view which shows an example which filled the filler in the space part formed by connecting a concrete sheet pile. It is the elements on larger scale which show an example of the state which filled the filler in the space part. (A) is a schematic diagram which shows an example of the state which the hardening | curing material of the filling material shrink | contracted by drying shrinkage | contraction, and the gap | interval produced, (b) is the state which the exposed water expansion material expanded in contact with the water | moisture content It is a schematic diagram which shows an example. (A) is sectional drawing which shows the connection state of a steel pipe sheet pile, (b) is the A section enlarged view of (a). It is sectional drawing which shows the state which filled the space material with the filler. (A) is a schematic diagram which shows an example of the state before filling a filler around a structure, (b) is a schematic diagram which shows an example of the state which filled the filler around the structure.

Explanation of symbols

10, 10A Filler 11 Water expansion material 12 Curing material 12A Fluidized soil (hardening material)
13 Cracks (gap)
K Steel pipe sheet pile J Joint part S Space part C Concrete sheet pile H Concave part

Claims (4)

  A filler characterized in that a water expansion material is mixed in a hardening material.   2. The filler according to claim 1, wherein the water expansion material is made of any one of urethane, sponge, and nonwoven fabric. The shape of the water expansion material is
The filler according to claim 1 or 2, wherein the filler is formed in any one of a chip shape, a spiral shape, a string shape, a rod shape, a disk shape, and a spherical shape.   A water stopping method, wherein a space formed in contact with moisture is filled with a filler obtained by mixing a water expansion material and a curing material.

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