JP5103602B2 - Steel sheet pile joint filler - Google Patents

Description

  The present invention relates to a filler that is filled for the purpose of preventing earth and sand from entering the female side joint of a steel sheet pile when the steel sheet pile is set. Here, the steel sheet pile is a steel member having a male-female joint, and the male-side joint is sequentially fitted to the female-side joint, and the steel is a continuous or closed steel for earth retaining and water stop purposes. A member for constructing a manufacturing structure. For example, a steel pipe sheet pile, a sheet wall, a steel sheet pile (H type, U type, Z type, straight line) and the like correspond.

  During the construction of the steel sheet pile, if the earth and sand enters the female side joint of the steel sheet pile during construction, when the male side joint of the next steel sheet pile is installed, the intruded earth and sand becomes an obstacle and the male side There was a problem that the joint could not be easily fitted. As a result, the installation may not be possible in the middle (highly stopped), or the joint part may be damaged. In addition, since the sheet pile wall is fixed and the water blocking wall is set after installation, when the mortar is removed by removing water from the inside of the joint with a water jet, the earth and sand solidified inside the joint cannot be easily removed. There was a problem that the earth and sand that had been reduced lowered the water stop effect of the sheet pile wall.

Therefore, in order to solve these problems, various invasion prevention techniques have been proposed for intrusion of earth and sand into the steel sheet pile female side joint, and it relates to the joint structure of the steel sheet pile (for example, Patent Documents 1 to 3). Reference), related to the filler filled in the joint part (for example, see Patent Documents 4 and 5), related to prevention of earth and sand inflow into the joint part at the time of steel sheet pile installation (for example, refer to Patent Documents 6 to 8), The thing related to the cleaning of the inside of a joint part, the sediment removal method (for example, refer to patent documents 9), etc. is proposed.
JP 54-125816 A Japanese Utility Model Publication No. 3-86133 Japanese Utility Model Publication No. 7-29017 JP-A-4-179725 JP 2004-225444 A Japanese Patent Laid-Open No. 10-102483 JP 2001-152445 A JP 2001-355232 A JP-A-4-34114

However, the conventional measures as described above are not sufficient to prevent the ingress of sediment into the female joint, and in particular, the sand layer and the gravel layer deeper than the groundwater level cannot prevent the intrusion of sediment.
Regarding the steel sheet pile joint structure, although it has the effect of reducing the sediment intrusion pressure during installation, it has not been able to prevent the intrusion of sediment. In addition, those related to the lid of the slit part are vulnerable to soil water pressure and easily damaged, and when the male joint is fitted, the lid of the slit part is torn, so that the soil and sand enter the gap of the fitting part There was also a defect that earth and sand were compacted, and that the lid was turned not to the outside but turned to the inside of the joint part, causing the following placing trouble.

In order to compensate for the above-mentioned drawbacks, the filler related to the filler filled in the joint part was previously filled with a filler inside the female side joint to prevent the intrusion of earth and sand from the slit part. It is a material that cannot be removed from the joints with a porous fiber material or asphalt compound, and since it does not presuppose a mortar filling method, it is characterized by its ability to stop water. However, superabsorbent fiber material is short-term construction because it lacks long-term stability, and can be used repeatedly by pulling out steel sheet piles. Asphalt compounds are concerned about environmental problems and mortar filling method Compared to the above, it is weak against temperature fluctuations and is not an excellent water stop method.
Regarding the prevention of sediment inflow into the joint when steel sheet piles are installed, the joint is filled with foamed polystyrene and foamed vinylidene, and the pipe that closes the joint slit is installed in the joint. However, the latter has difficulty in installing pipes.

  Based on the applicant's patent (Patent 3668410), the present applicants have used bentonite granules for joints at the time of steel sheet pile settling for the purpose of water stoppage and gravel invasion prevention. Although it was obtained, there was a site where it could not be set up halfway due to the placement method at the construction site and soil conditions. The cause is resistance due to the filler in the joint, and improvement as a filler has been demanded.

  A method of filling clay or CB mortar (Japanese Patent Laid-Open No. 2002-285546) has been disclosed, but as estimated from the performance of the applicants, the lubricity obtained from blending with clay (bentonite) is Under the limited conditions, the intended effect cannot be easily obtained. In addition, CB mortar needs to be filled and cured in the joint portion in advance prior to the steel sheet pile setting, and since the mortar has increased hardness over time, there is a problem that a stable effect cannot be obtained. Furthermore, these removals are not easy, and there is a concern that they may remain inside the joint.

The present invention has been made to solve the above-mentioned conventional problems, and its purpose is to facilitate the filling operation, and to ensure the intrusion of earth and sand into the joint without impairing the workability of the steel sheet pile. An object of the present invention is to provide a filler that can be easily prevented and discharged easily.
The present invention provides a granular filler that is easily sheared when the male side joint is fitted into the female side joint before the steel sheet pile is laid, and is easily discharged during cleaning of the inside of the joint. As a result of diligent research focusing on the fact that it is preferable as a filler for the female side joint of a steel sheet pile, the present invention has been achieved.

In order to achieve the above object, the steel sheet pile joint filler according to the present invention is a granular filler that is pre-filled in the female side joint in the steel sheet pile joint, and the granular filler contains 30 to 30 % of wood flour. It contains 100% by weight and 0 to 70% by weight of bentonite, and is contained in a bag or container having a diameter that can be inserted into a female side joint in a steel pipe sheet pile joint .

If this granular filler is filled in the female side joint before setting the steel sheet pile with this configuration, it is possible to prevent the infiltration of earth and sand into the female side joint when setting the steel sheet pile. When the male side joint of the sheet pile is fitted into the female side joint of the steel sheet pile already placed, it is possible to prevent intrusion of earth and sand. Further, this granular filler is easy to be sheared when the male joint is fitted into the female joint, and easily removed when the joint is cleaned, so that the construction is easy. When washing with a jet, it can be easily dispersed in water and discharged outside the joint.
Moreover, since this granular filler is made of wood powder and bentonite, even if it is washed and discharged to the outside of the joint, it does not adversely affect the soil and the environment.

The granular filler may be directly filled by covering the female joint slit, or filled into a bag-like or cylindrical container and then filled into the joint. Further, after the bag-like or cylindrical container is inserted into the joint, the filler may be air-fed and filled with compressed air. The filler provided by the present invention is granular and can be filled into the joint by air feeding or natural fall without being affected by the shape of the joint.
The wood powder used for the granular filler is preferably a 60 mesh-passed product from the viewpoint of water dispersibility and environmental load, and the type of wood is not limited. When fine-grained wood powder (60-mesh-passed product) is used, water is quickly absorbed and dispersed and submerged in water. On the other hand, when the particle size is coarse, the dispersibility with respect to water decreases, and the wood powder floats on the surface of the water, which is not preferable in terms of environment. Moreover, if the above-mentioned properties are satisfied, the wood flour can be replaced with short fiber pulp or the like.
Even if the bentonite used is Ca-type, Na-type or activated, the above-mentioned purpose can be achieved.

  Further, in the granular filler of the present invention, the wood powder is 30 to 100% by weight and the bentonite is 0 to 70% by weight when the wood powder is less than 30% by weight and the bentonite exceeds 70% by weight. This is because the shearing property when fitting the male side joint into the joint and the discharging property when cleaning the inside of the joint are not preferable.

According to the steel sheet pile joint filler of the present invention, the following effects can be obtained.
(1) If the female side joint of the steel sheet pile is pre-filled and installed, when the steel sheet pile is installed, in order to prevent the infiltration of earth and sand into the female side joint, The fitting of the male side joint becomes easy and the workability is improved.
(2) Moreover, since the granular filler is easily sheared, the fitting of the male joint becomes easy. In particular, the effect is great because the shear resistance decreases in the presence of water.
(3) Since the earth and sand enter the joint, and the inside of the female side joint of the steel sheet pile does not cause compaction due to vibration during placement and the fitting pressure of the male side joint, the inside of the joint can be easily cleaned. Therefore, it is possible to prevent foreign matter from remaining when completely discharging the inside of the joint with jet water.
(4) Since this filler is granular, it can respond to various joint shapes regardless of the shape of the joint portion. In addition, it is possible to send air by compressed air. Since the construction is easy, the workability of the steel sheet pile is not impaired.
(5) Since wood powder is used as a raw material, it is lightweight and filling work is easy. It is made of bentonite, a wood powder and clay mineral, and has a low environmental impact.
(6) Bentonite has a water-stopping effect, and even if it leaks from the joint fitting site, the effect as a water-stopping material around the joint can be expected.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a steel pipe sheet pile illustrating an embodiment of the present invention, and FIG. 2 is a partially broken front view showing the embodiment of the present invention. In this example, P-P is used as a steel sheet pile. It is shown by a mold joint steel pipe sheet pile.

  A steel pipe sheet pile 1 shown in FIG. 1 has a female side joint 3 and a male side joint 2 attached in parallel to the longitudinal direction of the steel pipe sheet pile 1, and a lid 4 is welded to the tip of the female side joint 3 to prevent infiltration of earth and sand. Has been. The steel pipe sheet pile 1 is preliminarily filled with a filling member 6 in the female side joint 3 and installed. When the next steel pipe sheet pile 1 is installed adjacent to the side of the steel pipe sheet pile 1, the next steel pipe sheet pile 1 is provided. The male side joint 2 is fitted to the female side joint 3 of the steel pipe sheet pile 1 that has already been laid down, and then laid down. At this time, since the female joint 3 is filled with the filling member 6, the infiltration of earth and sand is prevented and the granular filler 8 of the filling member 6 is easily sheared. Can be fitted with almost no obstacles. This filling member 6 shows the case where the granular filler 8 which granulated what contained 30-100 weight% of wood flour, and 0-70 weight% of bentonite was put in the mesh-shaped bag 7. Yes.

  FIG. 2 shows a filling member 6 in which the granulated granular filler 8 is put in a mesh-like bag 7, and the filling member 6 is filled into the female joint 3 without a gap. The mesh-shaped bag 7 has a diameter that is several centimeters thinner than the inner diameter of the female side joint 3, and facilitates filling into the female side joint 3. When the mesh bag 7 is erected for placing the steel pipe sheet pile 1, the mesh bag 7 is compacted by its own weight to the lower part of the female joint 3, and closes the joint slit part 5 without a gap. Thereby, infiltration of the earth and sand into the inside of the female side joint 3 at the time of sinking is prevented. The male side joint 3 of the next steel pipe sheet pile 1 is set while tearing the filling member 6 in the female side joint 3. And it can be done quickly. In addition, since the shear resistance of the granular filler 8 is further reduced by water, it becomes more effective for placement in an environment with water.

  After the placement, when the mortar is poured into the joint to fix the sheet pile wall, the granular filler 8 inside the joint needs to be removed. At this time, since the granular filler 8 is easily dispersed with water, it can be easily removed with a water jet, and foreign matter such as earth and sand can be avoided. In addition, since the granular filler 8 leaking from the joint contains bentonite in terms of composition, it can be expected to be effective as a water stop material in the periphery of the joint. Further, since it does not contain components that cause environmental problems, it does not become a source of environmental pollution.

The mesh-shaped bag 7 is easy to handle in the shape shown in FIG. It can also be sent by compressed air. This filling method by air transportation is suitable for large bridges where many steel sheet piles are joined by welding. In addition, the joint slit portion 5 may be covered and filled with the filling member 6 or the granular filler 8. Moreover, since the granular filler 8 is granular, it does not concern about the shape of the bag, and various shapes can be selected according to the shape of the joint.
The container for the mesh bag 7 and the granular filler 8 may be any material as long as it is sheared by the fitting pressure of the male joint 2.

The filler according to the present invention not only prevents the intrusion of earth and sand in the female joint, but also has a low shear resistance when the male joint is fitted, and needs to be easily dispersed in water when removed.
For that purpose, a particle shape of about 3 mm diameter having 30 to 100% by weight of wood flour and 0 to 70% by weight of bentonite is desirable. Desirably, a 3 mm diameter granule having 50 to 100% by weight of wood flour and 0 to 50% by weight of bentonite is suitable. The greater the blending ratio of wood powder, the lower the shear resistance and the easier it is to disperse in water, but it tends to be pulverized and dusted during construction, and the workability tends to deteriorate.
These raw materials are granulated into pellets or granules by various granulation methods such as extrusion granulation, rolling granulation, compression granulation, fluidized bed granulation, etc. It is not about the grain method.
Moreover, the granularity said here has shown the particle | grains whose diameter is about 1-10 mm in diameter.

  Hereinafter, the present invention will be described in more detail with reference to examples. Table 1 shows examples and comparative examples showing evaluations of pellet-shaped fillers granulated by an extrusion granulation method by changing the blending of wood powder and bentonite, and their evaluations. No. 8 is Examples 1 to 8 of the present invention, and Test No. 9 is a comparative example.

※膨潤量：１０ｍｉｎ後の値を記載
※ＮＤ：抵抗が低く測定不可能

* Swelling amount: Enter the value after 10 min * ND: Resistance is low and cannot be measured

The said test was implemented with the underwater disintegration test method and the shearing resistance value measuring method, and the testing method and the measuring method are as follows.
<Underwater disintegration test method>
100 ml of city water is taken into a 100 ml beaker, 5 g of a sample is put, and the mixture is stirred when 5, 10, 15, 20 minutes have elapsed, and the depth (swelling amount) of the collapsed material is measured. In addition, the particle disintegration time (disintegration time) is confirmed from the residual state of the particles. Therefore, the greater the amount of swelling in a short time and the shorter the disintegration time, the better the water dispersibility.
<Shear resistance measurement method>
A sample is filled in a steel pipe having an inner diameter of 150 mm and a length of 500 mm, and a 100 mm wide and 10 mm thick plate is inserted from above. The indentation pressure at that time was defined as a shear resistance value. Regarding the water immersion, the steel tube filled with the sample was immersed in water, the above test was performed 24 hours later, and the pressure during indentation was measured.

According to the test results of Examples 1 to 8 and Comparative Example shown in Table 1 above, it can be seen that the swelling amount increases and the disintegration time further decreases as the blending ratio of the wood flour (uses 100 mesh under product) increases. It was.
Since it is presumed that the shear resistance value is desirably 0.8 MPa or less due to consistency with construction, the blending ratio of Examples 1 to 8 (Test Nos. 1 to 8) (bentonite 70% or less, wood flour 30% or more) ) Meets the objectives of the present invention. Furthermore, since the amount of swelling is desired to be 30 ml or more for the same reason, the blending ratio of Examples 5 to 8 (Test Nos. 5 to 8) (bentonite 50% or less, wood flour 50% or more) is more appropriate. I can say that.
The particle size is considered to affect the water penetration time when the filler is immersed in water.
When Examples 3 to 5 (Test Nos. 3 to 5) were compared, the amount of swelling per short time (10 min) was the highest in Example 5 (Test No. 5) (particle diameter φ3 mm), It shows that the diameter is appropriate. In Example 3 (Test No. 3) (particle diameter φ5 mm), the penetration into the filler was fast, but the penetration into the single particle particle was slow and difficult to swell. Conversely, Example 4 (Test No. 4) (Powder size φ2mm), the penetration into the inside of one grain particle is fast, but the swelling and collapse layer prevents the penetration of water into the filler, so that only the filler surface swells and the water penetrates into the filler. Was observed to be late. In Examples 3 to 5 (test Nos. 3 to 5) (φ5 mm, φ2 mm, φ3 mm), an equivalent swelling amount was obtained after 6 hours, and the actual use is not limited to φ3 mmn.
In this filler, the shear resistance value when immersed in water is significantly lower than the shear resistance value when drying, and it can be seen that the use in the presence of water is effective.
The 100% bentonite of the comparative example (Test No. 9) has a high shear resistance value both during drying and when immersed in water, and it can be seen that the construction conditions are limited for this application.

  The above-described embodiments and examples do not limit the present invention, and the present invention can be variously modified without departing from the gist. For example, in the said embodiment, although it has shown with PP joint steel pipe sheet pile (steel pipe sheet pile joint) as a steel sheet pile, this also includes other steel sheet piles (for example, a sheet wall, a steel sheet pile, etc.). In addition, other conventionally known configurations may be employed for the male joint and the female joint.

It is a perspective view of the steel pipe sheet pile explaining embodiment of this invention. It is a partially broken front view showing an embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Steel pipe sheet pile 2 Male side joint 3 Female side joint 4 Lid 5 Slit part 6 Filling member 7 Mesh bag 8 Granular filler

Claims (1)

A particulate filler is pre-filled in the female-side joint in the joint of the steel sheet pile, the particulate filler is 30 to 100% by weight of wood flour, the bentonite contains 0 to 70 wt%, the joint of steel pipe sheet piles A steel sheet pile joint filler characterized by being contained in a bag or container having a diameter that can be inserted into the female joint .

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