JP2009144508A - Construction method of steel pipe sheet pile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method of a steel pipe sheet pile improving the impervious performance of a joint part by minimizing the inflow of sediment or the like from a slit of a C-shaped joint member when driven. <P>SOLUTION: The C-shaped joint member 4 is driven together with one steel pipe body 2a after filling the C-shaped joint member 4 with a plurality of columnar members 6 formed by packing a packed material 8 reacting to gel by water, in a corrugated board sheet 7 dissolved or decomposed by water. The inflow of sediment or the like into the C-shaped joint member 4 is thereby minimized by each columnar member 6 filled in the C-shaped joint member 4, and hence the impervious performance of the joint part 1 can be improved. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a construction method for a steel pipe sheet pile in which steel pipe main bodies are continuously arranged.

Generally, a steel pipe sheet pile is configured by connecting a plurality of steel pipe main bodies by joint portions. For example, a joint formed by inserting a T-shaped joint member into a C-shaped joint member having a slit in the axial direction is employed as the joint portion.
Moreover, the steel pipe sheet pile mentioned above is used as a water-impervious wall in a waste disposal site.For example, when industrial waste or general waste is disposed of in the coastal area, the steel pipe sheet pile is used as the outer sea side. Although it is divided into the disposal site side, it is necessary to prevent the retained water (turbid water) contaminated from the landfill disposal site from leaching into the open sea.

  However, when a joint portion formed by inserting a T-shaped joint member into the above-mentioned C-shaped joint member is employed in the steel pipe sheet pile, for example, a C-shaped joint member is placed during construction of the steel pipe sheet pile. In particular, earth and sand that forms a water channel from the slits of the C-shaped joint member (such as floor sand constructed on the local board) flow into the C-shaped joint member due to vibration caused by the vibro hammer. Then, there is a risk of greatly affecting the water shielding performance of the joint portion thereafter, and it has been necessary to suppress the inflow of earth and sand from the slit of the C-shaped joint member at the time of placing.

  In Patent Document 1, CT steel is fixed to one steel pipe of a steel pipe sheet pile, and a pipe having a CT-shaped steel insertion groove formed in the longitudinal direction is fixed to the other steel pipe. In the method of constructing the joint housed in the CT section steel, a water shielding plate is provided in the CT section steel as a means for blocking the inflow of water and mud from the CT section steel insertion groove into the pipe interior space. It is disclosed that after the inflow of water and mud into the internal space is cut off by inserting into the internal space, the water in the internal space is drained, and then the internal space is filled with a filler such as asphalt mixture and mortar. .

JP 2003-55958 A

However, in the invention of Patent Document 1, after inserting the other steel pipe together with the pipe, when the one steel pipe is inserted into the pipe together with the CT shape steel, the water shielding plate of the CT shape steel is pressed against the inner peripheral surface of the pipe. Since then, the inflow of water and mud from the slit into the pipe is blocked, but when the other steel pipe is driven together with the pipe, there is a risk of earth and sand flowing into the inside from the pipe slit. The problem cannot be solved.
In addition, in the invention of Patent Document 1, since sediment or the like flows in and accumulates in the pipe at the time of placing the pipe, a CT section steel extending from one steel pipe is inserted into the pipe extending from the other steel pipe. Thus, there is a risk that the placement resistance during the placement increases, and that the work becomes difficult.

  The present invention has been made in view of such points, and a steel pipe sheet pile construction method that suppresses inflow of earth and sand from the slit of the C-shaped joint member at the time of placing as much as possible and improves the water shielding performance of the joint portion. The purpose is to provide.

As a means for solving the above-mentioned problems, the present invention is characterized in that the invention described in claim 1 includes a C-shaped joint member extending from one of the adjacent steel pipe main bodies and the other steel pipe main body. A joint comprising a T-shaped joint member provided with a rubber plate extending and closely contacting along the inner peripheral surface of the C-shaped joint member to form a closed portion in plan view with the inner peripheral surface A steel pipe sheet pile construction method comprising: a columnar member in which a packing material that reacts in a gel state with water is packed in a sheet that is dissolved or decomposed with water in the C-shaped joint member A filling step; a C-shaped joint member placing step for placing a C-shaped joint member together with the one steel pipe main body after the filling step; and a C-shaped joint member placing step after the C-shaped joint member placing step. After the packing material in the joint member reacts in a gel state, the T-shape The T-shaped joint member is placed in the C-shaped joint member together with the other steel pipe body so that the rubber plate of the hand member is in close contact with the inner peripheral surface of the C-shaped joint member to form the closed portion. And a T-shaped joint member placing step that is inserted and placed.
In the invention of claim 1, since the C-shaped joint member is filled in advance with a columnar member that is packed with a sheet that is dissolved or decomposed by water, the packing material that reacts in a gel state with water. When the C-shaped joint member is driven together with the one steel pipe body, the columnar member can suppress the inflow of earth and sand into the C-shaped joint member as much as possible.
In addition, after placing the C-shaped joint member, the packing material in the columnar member filled in the C-shaped joint member changes into a gel-like body by reaction with water. Even if the rubber plate is inserted into the C-shaped joint member so as to be in close contact with the inner peripheral surface of the C-shaped joint member, it can be easily placed without increasing the placement resistance. Moreover, damage to the rubber plate fixed to the T-shaped joint member can be prevented.

According to a second aspect of the present invention, in the first aspect of the invention, after the T-shaped joint member placing step, the range of the closed portion in a plan view extends over the entire height of the C-shaped joint member. A cleaning step for cleaning, and a water shielding material filling step for filling the range of the closed portion in plan view with the water shielding material over the entire height of the C-shaped joint member after the cleaning step. It is characterized by.
In the invention of claim 2, it is possible to prevent outflow of the water shielding material from the closed portion, and consequently outflow of the water shielding material from the C-shaped joint member, and to improve the water shielding performance of the joint portion.

The invention described in claim 3 is the invention described in claim 1 or 2, wherein the packing material is an aggregate of granules that swell and gel by reaction with water and have a water stopping function. It is what.
In the invention of claim 3, the water shielding performance of the joint portion is further improved.

In the invention described in claim 4, in the invention described in any one of claims 1 to 3, the sheet is a corrugated cardboard sheet.
In the invention of claim 4, since a corrugated cardboard sheet is adopted as the sheet, it is advantageous in terms of cost.

The invention described in claim 5 is characterized in that in the invention described in claim 4.
In the invention of claim 5, since no fastener or the like is used, it is possible to prevent deterioration of the water shielding performance due to the residual of the fastener or the like.

According to the construction method of the steel pipe sheet pile of the present invention, the C-shaped joint member is driven after the columnar member is filled in the C-shaped joint member, particularly in the joint portion. This prevents inflow of earth and sand forming a water channel into the C-shaped joint member.
In addition, after placing the C-shaped joint member, the material to be packed in the columnar member filled in the C-shaped joint member changes into a gel-like body by reaction with water. When inserting and driving into the letter-shaped joint member, it can be easily driven without increasing the driving resistance, and damage to the rubber plate fixed to the T-shaped joint member can be prevented. .
Thereby, since the inflow of the earth and sand from a slit is prevented beforehand at the time of placement of a C-shaped joint member, the water shielding performance in the joint part of a steel pipe sheet pile can be improved.

FIG. 1 is a cross-sectional view perpendicular to the axis of a joint after construction of a steel pipe sheet pile. FIG. 2 is a perspective view of the columnar member. FIG. 3 is a cross-sectional view perpendicular to the axis of the columnar member. 4A and 4B are views for explaining the filling step in the steel pipe sheet pile construction method, in which FIG. 4A is a sectional view taken along line AA in FIG. 4B, and FIG. It is sectional drawing. FIG. 5 is a drawing for explaining a steel pipe sheet pile construction method, in particular, a T-shaped joint member placing step, (a) is a sectional view taken along line BB in (b), (b) ) Is an axial sectional view of the joint. FIG. 6 is a construction method of a steel pipe sheet pile, particularly for explaining the cleaning step. (A) is a sectional view taken along line CC of (b), and (b) is a shaft of the joint part. It is sectional drawing. FIG. 7: is a construction method of a steel pipe sheet pile, and is a figure for demonstrating especially a water-shielding material filling step, (a) is sectional drawing which follows the DD line | wire of (b), (b) is a coupling. It is an axial sectional view of a portion.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to FIGS.
As shown in FIG. 1, the construction method of the steel pipe sheet pile according to the embodiment of the present invention is a C-shaped joint member 4 that is integrally extended from one of the adjacent steel pipe main bodies 2a, 2b. And a rubber plate that is integrally extended from the other steel pipe main body 2b, closely contacts the inner peripheral surface of the C-shaped joint member 4, and forms a closed portion 13 in plan view with the inner peripheral surface. 3 is employed in a joint portion 1 including a T-shaped joint member 5 provided with 3. In addition, one steel pipe main body 2a and the C-shaped joint member 4 are integrally joined by welding, and the other steel pipe sheet pile 2b and the T-shaped joint member 5 are also integrally joined by welding.

As shown in FIG. 1, the C-shaped joint member 4 extends from substantially the entire length of one steel pipe main body 2 a. The C-shaped joint member 4 is formed in a C-shaped cross section by forming a slit 9 having a predetermined width extending in the axial direction at a portion facing the other steel pipe main body 2b.
As shown in FIG. 1, the T-shaped joint member 5 is extended from substantially the entire length of the other steel pipe main body 2b. The T-shaped joint member 5 is fitted in the slit 9 of the C-shaped joint member 4, and extends in a direction substantially orthogonal to the column part 11 extending toward one steel pipe body 2 a and the tip of the column part 11. It is formed in a T-shaped cross section composed of the orthogonal column part 12.
A rectangular rubber plate 3 is fixed to the orthogonal column portion 12 of the T-shaped joint member 5 so as to cover the orthogonal column portion 12. When the T-shaped joint member 5 is inserted into the C-shaped joint member 4, the rubber plate 3 is bent along the inner peripheral surface of the C-shaped joint member 4 from both ends of the orthogonal column portion 12. Close contact with the inner peripheral surface is formed between the inner peripheral surface and the rubber plate 3 in plan view.
The vertical range in which the rubber plate 3 is fixed is, as shown in FIG. 5B, from the upper end of the T-shaped joint member 5 when the T-shaped joint member 5 is driven. The range is about 1.5 m below the upper end.

Next, although the construction method of the steel pipe sheet pile which concerns on embodiment of this invention is demonstrated, this construction method is related with the construction method of the joint part 1 of a steel pipe sheet pile especially.
First, as a filling step, as shown in FIG. 4, a plurality of columnar members 6 are filled in the C-shaped joint member 4.
As shown in FIGS. 2 and 3, each columnar member 6 has a water-stop function and swells when reacted with water to change into a gel-like body 8 ′ (see FIG. 5). The cardboard sheet 7 is a sheet that is dissolved or decomposed by the above, and is packed and configured as described later.
Moreover, the range of the up-down direction with which the columnar member 6 is filled in the C-shaped joint member 4 is as shown in FIG. 4 (b) when the C-shaped joint member 4 is driven from the upper end of the sand layer. This is the range up to the lower end of the C-shaped joint member 4. In FIG. 4B, only two columnar members 6 are shown in the C-shaped joint member 4, but actually two or more columnar members 6 are filled.

The packaged material 8 is an aggregate in which granules are aggregated, and moisture quickly permeates between particles, absorbs more water in a short time, swells, gels, and exhibits a water stop function. As the granule, either an inorganic granular water-stopping material or an organic granular water-stopping material can be adopted. The inorganic granular water-stopping material is preferably a clay mineral having water swellability, and specifically includes smectite clay minerals and swellable mica minerals, which may be natural or synthetic. In the case of an organic granular waterstop material, granular CMC (carboxymethylcellulose) is particularly suitable.
More specifically, the granule is preferably bentonite which is one of smectite clay minerals. Bentonite includes sodium type and calcium type bentonite. Activated calcium type bentonite is excellent in swelling property and swelling rate, and is more preferable from the viewpoint of water-stopping effect. The physical properties of this calcium-type bentonite related to water stop are swelling capacity: 20 ml / 2 g or more, water pressure resistance: 490 kPa or more, water permeability: 1 × 10 ⁻⁵ cm / sec or less.
In addition, in this Embodiment, although the granule mainly has the above-mentioned calcium type bentonite, what added the wood flour further is employ | adopted.

Specifically, the corrugated cardboard sheet 7 most preferably has a thickness of about 1.5 mm to 2.5 mm. Note that the sheet may simply be a stack of a plurality of paper sheets.
2 and 3, a rectangular corrugated sheet 7 having a thickness of about 2.0 mm and a size of about 100 cm × about 50 cm is first rolled into a cylindrical shape having a diameter of about 13 cm and a length of 100 cm. Then, the overlapping free ends 14 and 14 are fixed with an adhesive. Next, a bottomed cylindrical body is formed by folding the one end opening inward and stopping with an adhesive. Next, after filling the material to be packed (granule aggregate) 8 from the other end opening, the other end opening is similarly folded inward and stopped with an adhesive.
As a result, a columnar member 6 having a diameter of about 13 cm, a length of about 75 cm, and a weight of about 3 kg is formed.

Furthermore, with reference to FIG. 4, the method of filling the some columnar member 6 in the C-shaped coupling member 4 in a filling step is demonstrated concretely.
A plurality of the above-mentioned columnar members 6 are put into a C-shaped joint member 4 extending from one steel pipe main body 2a at a temporary storage place for steel pipe sheet piles, and each columnar member 6 is slit 9 with hooks (rebar hackers or the like). In order to fill the above-mentioned range by sequentially pulling toward the lower end of the C-shaped joint member 4. Thereafter, the slit 9 of the C-shaped joint member 4 is closed by the closing member 10 except for a slight range at the upper end thereof, and the upper and lower end openings of the C-shaped joint member 4 are also closed by the closing member 10. As the closing member 10, an adhesive tape, a thin rubber plate, or the like is employed. During the placement of the C-shaped joint member 4, the closing member 10 causes the buoyant force or the corrugated cardboard sheet 7 to break out of the packaging material 8 due to breakage of the corrugated cardboard sheet 7, and earth and sand from the outside into the C-shaped joint member 4. Is trying to prevent the inflow of as much as possible.

Next, as a C-shaped joint member placement step, one steel pipe body 2a filled with a plurality of columnar members 6 in the C-shaped joint member 4 is lifted, and the one steel pipe body 2a is installed in advance for positioning. It is set in the conducting material and is driven with a vibro hammer together with the C-shaped joint member 4.
At this time, in addition to the closing member 10 that closes the slit 9 of the C-shaped joint member 4, each columnar member 6 filled in the C-shaped joint member 4 causes the inside of the C-shaped joint member 4 to vibrate due to vibration of the vibro hammer. It is possible to minimize the inflow of earth and sand (for example, pre-installed sand on the local board).
When a predetermined time elapses after the C-shaped joint member 4 is placed, the cardboard sheets 7 of the columnar members 6 in the C-shaped joint member 4 are dissolved by water, and the packing material 8 reacts with water. It swells and changes into a gel-like body 8 ′.

Next, as the T-shaped joint member placing step, the other steel pipe main body 2b is lifted, and as shown in FIG. 5, the column portion 11 of the T-shaped joint member 5 of the steel pipe main body 2b is formed in the C-shape of the steel pipe main body 2a. While fitting into the slit 9 of the joint member 4, the rubber plate 3 is bent along the inner peripheral surface of the C-shaped joint member 4 from both ends of the orthogonal column part 12, and is in close contact with the inner peripheral surface of the C-shaped joint member 4. In this way, the steel pipe body 2b is driven together with the C-shaped joint member 4 with a vibro hammer.
At this time, the corrugated sheet material 7 of each columnar member 6 in the C-shaped joint member 4 is dissolved, and the packing material 8 is changed to a gel-like body 8 ′ by reaction with water, so that the placing resistance is reduced. The T-shaped joint member 5 can be easily driven into the C-shaped joint member 4 without being increased, and damage to the rubber plate 3 fixed to the T-shaped joint member 5 can be prevented. Of course, when the T-shaped joint member 5 is inserted into the C-shaped joint member 4 and placed, the closing member 10 that has closed the slit 9 of the C-shaped joint member 4 is While being broken by the column portion 11 of the character-shaped joint member 5, the column portion 11 and the orthogonal column portion 12 of the T-shaped joint member 5 are immersed in the gel-like body 8 ′ in the C-shaped joint member 4.
Further, when the placement of the T-shaped joint member 5 is completed, the vertical range (T-shaped) in which the rubber plate 3 is fixed to the orthogonal column portion 12 of the T-shaped joint member 5 within the C-shaped joint member 4. In the plan view, the inner peripheral surface of the C-shaped joint member 4 and the rubber plate of the T-shaped joint member 5 are located in a range from the upper end of the joint member 5 to about 1.5 m below the upper end of the local board. 3, a closed portion 13 is formed between the two.

Next, as a cleaning step, as shown in FIG. 6, the closed portion 13 is formed in a plan view formed between the inner peripheral surface of the C-shaped joint member 4 and the rubber plate 3 in the C-shaped joint member 4. Is cleaned over the entire height of the C-shaped joint member 4. For this reason, the gel-like body 8 ′ is discharged from the closed portion 13 in the C-shaped joint member 4, and the gel-like body 8 ′ remains in a range other than the closed portion 13 in plan view.
Next, as a water shielding material filling step, as shown in FIGS. 1 and 7, a non-shrink mortar 15 as a water shielding material is formed in a C shape in the range of the closed portion 13 in a plan view in the C-shaped joint member 4. It is driven over the entire height of the joint member 4. At this time, in the portion where the closed portion 13 is formed in the C-shaped joint member 4 (range from the upper end of the joint portion 1 to about 1.5 m below the upper end of the local board), the non-shrink mortar 15 is closed. 13, by extension, does not flow out from the slit 9 of the C-shaped joint member 4. On the other hand, in the part where the closed part 13 is not formed in the C-shaped joint member 4 (range from the lower end of the joint part 1 to about 1.5 m below the upper end of the local board), the non-shrink mortar 15 is a T-shaped joint. It flows slightly to the gel-like body 8 ′ side beyond the orthogonal column part 12 of the member 5.
In this embodiment, the non-shrink mortar 15 is employed as the water shielding material, but asphalt or the like may be employed.

As described above, according to the embodiment of the present invention, in particular, the C-shaped joint member 4 includes a filling step of filling a plurality of columnar members 6 in which the material to be packed 8 is packed with the cardboard sheets 7. Therefore, in the C-shaped joint member placing step of the next process, the C-shaped joint member 4 due to the vibration of the vibro hammer is caused by the columnar members 6 filled in the C-shaped joint member 4 in addition to the closing member 10. Inflow of earth and sand into the inside can be suppressed as much as possible.
Thereby, since the inflow into the C-shaped joint member 4 such as earth and sand causing leakage is prevented as much as possible, the water shielding ability in the joint portion 1 can be improved.
Further, in the embodiment of the present invention, after the C-shaped joint member 4 is placed, the packing material 8 of each columnar member 6 filled in the C-shaped joint member 4 is gelled by reaction with water. Since it is changed to the body 8 ′, the T-shaped joint member 5 can be easily inserted into the C-shaped joint member 4 without increasing the placing resistance in the T-shaped joint member placing step in the next process. Further, the rubber plate 3 fixed to the T-shaped joint member 5 can be prevented from being damaged.
In addition, the columnar member 6 is configured by packing the material to be packed 8 with an adhesive using a corrugated cardboard sheet 7 and does not use a fastener or the like, so that water shielding is ensured.

DESCRIPTION OF SYMBOLS 1 Joint part, 2a One steel pipe main body, 2b The other steel pipe main body, 3 Rubber plate, 4 C-shaped joint member, 5 T-shaped joint member, 6 Columnar member, 7 Corrugated cardboard sheet (sheet), 8 Packaged material, 8 'gel-like body, 13 closed part, 15 non-shrink mortar (water shielding material)

Claims (5)

A C-shaped joint member extending from one of the adjacent steel pipe main bodies, and a C-shaped joint member extending from the other steel pipe main body, and closely contacting the inner peripheral surface of the C-shaped joint member It is a construction method of a steel pipe sheet pile having a joint portion composed of a T-shaped joint member provided with a rubber plate that forms a closed portion in a plan view with a surface,
In the C-shaped joint member, a filling step of filling a columnar member in which a packing material that reacts in a gel state with water is packed with a sheet that is dissolved or decomposed with water,
After the filling step, a C-shaped joint member placing step for placing a C-shaped joint member together with the one steel pipe body;
After the C-shaped joint member placing step, after the packing material in the C-shaped joint member reacts in a gel state, the rubber plate of the T-shaped joint member is the C-shaped joint member. T-shaped joint member placement in which a T-shaped joint member is inserted into the C-shaped joint member and placed together with the other steel pipe body so as to form a closed portion in close contact with the inner peripheral surface Steps,
The construction method of the steel pipe sheet pile characterized by having provided. After the T-shaped joint member placing step, a cleaning step for cleaning the range of the closed portion in plan view over the entire height of the C-shaped joint member;
After the washing step, a water shielding material filling step for filling a water shielding material in a range of the closed portion in a plan view over the entire height of the C-shaped joint member;
The construction method of the steel pipe sheet pile of Claim 1 characterized by the above-mentioned.   The construction method of a steel pipe sheet pile according to claim 1 or 2, wherein the packing material is an aggregate of granules that swell and gel by reaction with water and have a water stopping function.   The said sheet | seat is a corrugated cardboard sheet | seat, The construction method of the steel pipe sheet pile in any one of Claims 1-3 characterized by the above-mentioned.   The construction method of the steel pipe sheet pile according to claim 4, wherein an adhesive is used when the material to be packed is packed with the corrugated cardboard sheet.