JPH10168879A - Pulling method for steel sheet pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pulling method for a steel sheet pile by which the danger of collapsing the ground can be eliminated, and also the place of use of not limited due to its vibration and noise. SOLUTION: After the completion of constructing an underground structure, a steel pipe sheet pile 1 is pulled out by the following method. First, the soil improvement 2 is performed for the back of the steel pipe sheet pile 1, and back filling is bone for the inside of the works. After the reaction ground for pulling a steel pipe sheet pile 1 is improved, a guide wall 6 for muddy water replacement work and a jack is constricted. Next, after soil in the steel pipe sheet pipe 1 is discharged by an auger screw, mud replacement is performed for the periphery of the steel pipe sheet pile by a superhigh pressure injection pump to sever the relation with the ground. A pulling device (Japan Patent Laid-Open No. 3-126437) is installed on the guide wall 6 to pull out the steel pipe sheet pile 14. Thus, the steel pipe sheet pile 1 is pulled out, and then back foiling is done for the pull-out trace and grout is injected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of drawing a steel pipe sheet pile usable in an urban area or the like.

[0002]

2. Description of the Related Art Sheet piles that have been driven into the ground prior to construction for the purpose of embankment and water stoppage are pulled out after construction. Conventionally, however, a vibratory hammer of a pile driver has been used, and a steel pipe has been attached with a chuck of the vibro hammer. The upper end of a pile or the like was directly grasped, or an iron plate was welded to the upper end of a steel pipe pile or the like, and this was grasped and pulled out. However, when the above-mentioned method is used, the pile is deformed and cut because the pile is vibrated through the chuck of the vibro hammer, and the place of use is limited due to the vibration and noise. .

In order to solve the above-mentioned problems, the present applicant has developed a drawing device for steel pipe piles or the like which does not utilize vibration, and disclosed it in Japanese Patent Application No. 26437/1991 as prior art.

[0004]

The use of the pulling device for steel pipe piles and the like reduces noise due to vibration and the like, and the place where the device can be used has been widened as compared with the use of a conventional vibro hammer. However, when pulling out and removing temporary piles and the like in an urban area, not only vibration and noise damage but also the possibility of ground collapse depending on the ground has been desired, and prompt measures have been desired.

The present invention has been made in order to solve the above-mentioned problems, and the present invention has been made to solve the above-described draw-out device (see FIG. 6).
The purpose of the present invention is to provide a method for quickly and safely removing a sheet pile from a vibration-free, noise-free steel pipe that does not limit the place of use.

[0006]

In order to achieve the above-mentioned object, in the present invention, a drawing device disclosed by the applicant of the present invention is used as a drawing device for steel pipe sheet piles (see Japanese Patent Application Laid-Open No. 10350/1994). . The device has the following configuration. At the lower end of the columnar main body to which the jack is connected, a mounting shaft protruding in the pulling direction is provided, and a connection fitting is provided on the mounting shaft so as to be movable in the pulling direction. Is attached to the pile driving surface so as to be able to advance and retreat, the tip of the gripping claw and the connection metal fitting are connected via a connecting link, and the columnar body is moved up and down to open and close the gripping claw, and And the pile was lifted up.

[0007] Then, after the construction of the underground structure is completed, the steel pipe sheet pile is drawn out by the drawing method comprising the following steps, using the drawing device having the above-described configuration. (First step) The ground behind the steel sheet pile is improved. (Second step) Temporary equipment during construction is removed and the inside is backfilled. (Third step) The ground around the steel pipe sheet pile is ground-improved to form a reaction force ground for drawing. (Fourth Step) A guide wall for a muddy water replacement work and a jack is constructed around the ground of the steel pipe sheet pile having the improved reaction ground. (Fifth step) The soil inside the steel sheet pile is discharged with an auger screw. (Sixth step) In order to cut off the steel pipe sheet pile and the surrounding ground, muddy water is replaced by an ultra-high pressure injection pump. (Seventh step) The drawing device provided with a reaction table and a power casing jack is installed on the guide wall, and the steel sheet pile is drawn out by the drawing device. (Eighth step) After the drawing is completed, backfill is performed on the drawing trace of the steel pipe sheet pile, and grout is injected as a measure to prevent ground subsidence.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic view showing a state in which the ground behind the steel pipe sheet pile has been improved after the completion of the joint groove installation work, and FIG. 2 is a state in which the ground has been constructed by backfilling the inside of the common groove and making a ground reaction force improvement. FIG. 3 is a schematic view showing a state in which soil in a steel pipe sheet pile is discharged by an auger screw, FIG. 4 is a schematic view showing a state in which muddy water is replaced by an ultra-high pressure injection pump, and FIG. ,
FIG. 6 is a schematic diagram showing a state where the drawing device A is installed, and FIG. 6 is a schematic diagram showing a state where grout is injected into a drawing trace of a steel pipe sheet pile. FIG. 7 is a longitudinal sectional view showing one embodiment of the drawing device A, wherein the left side (a) shows a state where the chuck is closed, and the right side (b) shows a state where the chuck is opened.

First, a drawing method of a steel pipe sheet pile to be performed after completion of a joint groove installation work in an urban area or the like will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a cast steel sheet pile,
As shown in FIG. 3, a plurality of steel pipe sheet piles 1 are arranged in parallel. Further, each of the plurality of steel pipe sheet piles 1 is connected by a junction 7. The junctions 7 are fixedly welded to the respective steel pipe sheet piles 1, and the adjacent junctions 7 are engaged with each other. In this embodiment, a steel pipe sheet pile having a circular cross section will be described, but the drawing device (a drawing device according to Japanese Patent Application No. 126437, hereinafter referred to as a drawing device A in the present application).
As long as the shape can be used, the shape of the sheet pile may be a polygon or a part of a cross section, and is not particularly limited.

First, as shown in FIG. 1, after the joint groove installation work is completed, ground improvement 2 is performed behind the steel pipe sheet pile 1 (first step). The purpose of the ground improvement in the present invention is to prevent ground collapse when muddy water replacement described later is performed and to solidify the foundation when performing reaction force ground improvement.

Next, as shown in FIG. 2, after removing the support 5 inside the common groove work, the inside of the work is backfilled (second step). In addition, the ground after backfilling needs to be ground in which ground collapse does not occur at the time of muddy water replacement described later. After the backfilling, a ground reaction improvement 3 is applied to the periphery of the steel pipe sheet pile 1 above the ground (third step), and when a heavy object is installed or the steel pipe sheet pile 1
The soil should be able to withstand the reaction force when pulling out. Then, after the reaction force ground improvement 3 is performed, the guide wall 6 is constructed to prevent collapse of the topsoil due to approach of a machine or the like (fourth embodiment).
Process). The ground improvement 2 and the reaction ground improvement 3 may employ a construction method according to the state of the ground and the soil quality in order to effectively achieve each purpose.

Further, as shown in FIG. 3, the soil inside the steel pipe sheet pile 1 is discharged by the auger screw 8 (fifth step). Next, as shown in FIG. 4, in order to cut off the periphery of the steel pipe sheet pile 1 from the ground, muddy water is replaced using an ultra-high pressure injection pump 10. The method of muddy water replacement is, for example, compressing muddy water generated by a muddy water plant to a high pressure, and through a water jet pipe attached to a rod portion of a rotary boring machine, or through the rod itself, the underground tip portion of the rod This is carried out by ejecting the compressed mud from above.

[0013] Further, the method for replacing muddy water is not limited to the use of a rotary boring machine, but may be configured such that an auger screw is used for the rod portion and muddy water is ejected from the tip of the auger screw. it can. Further, since the purpose of the muddy water replacement is to reduce the resistance at the time of pulling out the steel pipe sheet pile and to perform the pulling out quickly, the use of muddy water is not limited as long as this purpose can be achieved.

Reference numeral 9 in FIG. 4 shows an example in which a CJG (clam jet grout) machine is used as a device for sending compressed muddy water into the ground. However, the device is not limited to the CJG machine 9 as long as it has a function of sending compressed muddy water into the ground. In addition, since the purpose of the muddy water replacement is to reduce the resistance when the steel pipe sheet pile 1 is pulled out, the method of the muddy water replacement is not limited to the method and the use of the muddy water, and the purpose of the muddy water replacement can be effectively achieved. If it is a method, another construction method may be used (sixth step).

After the replacement of the muddy water, the steel pipe sheet pile 1 is pulled out using the drawing device A as shown in FIG. 5 (seventh step). In order to use the drawing device A, first, a reaction table C is installed on the guide wall 6 and the power casing jack B is fixed on the reaction table C. The power casing jack B is connected to, for example, four jacks B2 driven synchronously and a movable body of the jack B2, and a pair of holding members B1 that can be opened and closed to hold the columnar body (Yatco).
It is configured such that the columnar body A1 can be raised by holding the columnar body A1, released by holding the columnar body A1, and can be lifted up in a tapered manner.

The columnar main body (Yatco) A1 has a shape capable of being added to the cast steel pipe sheet pile 1, and the columnar main body A1 having a chuck attached to the tip thereof is a drawing device A. Then, the steel pipe sheet pile 1 is pulled out using the drawing device A and the power casing jack B.

The specific procedure for drawing the steel pipe sheet pile 1 using the drawing device A will be described below. (See FIG. 5) A reaction table C is set on the guide wall 6. A power casing jack B is installed on the reaction table C, a drawing device A is connected to an upper end of the steel pipe sheet pile 1, and a columnar main body A1 is held by a holding body B1. The steel pipe sheet pile 1 is pulled out with a power casing jack B in a length-measuring manner. The upper part of the drawn steel pipe sheet pile 1 is cut and removed. Backfill with filled soil and repeat ~ until the junction is disengaged. When the junction comes off, pull out the bow.

Next, the drawing device A will be described. As shown in FIGS. 5 and 7, the pulling-out device A mainly includes a columnar main body (Yatco) A1, a mounting shaft A2, and a connection fitting A.
3. It is composed of a gripper A5 and a link A4. The columnar main body A1 is, for example, a cylindrical body, and is provided with a pair of hanging metal fittings 14 at an upper portion so that the columnar main body A1 can be lifted by a crane. At a lower portion, a mounting substrate 15 for connecting a chuck is mounted. As described above, the pillar-shaped main body A1 is a portion that is held and lifted by the holding body B1 of the power casing jack B, has strength enough to withstand this, and the power casing jack B is a scale-up type lifter. Is long enough to perform

The mounting shaft A2 is provided in the mounting hole 1 of the mounting substrate 15.
6 is inserted from above and engaged with the flange 17 so as to project into the upper end of the steel pipe sheet pile 1. The connection fitting A3 is a connection board 1 mounted on the upper end of the steel pipe sheet pile 1.
8 and a ring-shaped guide plate 19 that covers the outer surface of the upper end portion of the steel pipe sheet pile 1. The mounting shaft A2 is inserted through an insertion hole 20 formed in the center of the connection substrate 18 so that the lower part of the mounting substrate 15 In the drawing, relative to the columnar main body A1 in the pulling-out direction. The guide plate 19 may be composed of two wedge-shaped members, which may be overlapped and connected by bolts. (See Fig. 6)

The gripping claw A5 is formed by a claw member 21 having a gripping surface 23 having an arc shape in a plan view that can abut on the inner surface of the steel sheet pile 1 and a pair of support levers 22 attached to the upper end. The gripping surface 23 is configured to advance and retreat with respect to the inner surface of the steel pipe sheet pile 1 by attaching the base of the support lever 22 to the distal end of the attachment shaft A2 via the horizontal pin 28. The connection link A4 is connected to the connection board 1
8 and the upper end of the gripping claw A5 are connected to each other, and both ends are attached to the lower surface of the connection board 18 via the pins 24 above the support lever 22, respectively. It is a member that swings forward and backward with respect to the inner surface of the steel sheet pile 1 while preventing the upper end of the gripping claw A5 from moving up and down.

The lengths and angles of the gripping claws A5 and the connecting links A4 are such that when the mounting shaft A2 rises with respect to the connection fitting A3, the gripping surface 23 is pressed against the inner surface of the steel sheet pile 1 and, conversely, when the gripping surface A3 descends. 23 is set so as to be separated from the inner surface of the steel pipe sheet pile 1 by a predetermined distance. In addition, the connecting pieces 2 overlapping each other are provided on the side surfaces of the mounting board 15 and the connection board 18.
5 and 26 are respectively protruded, and these connecting pieces 25 and 26 are connected by fixing pins 27 so that the mounting board 15 and the connecting board 18 are fixed in contact with each other.
Of the steel pipe sheet pile 1 can be held in an open state away from the inner surface thereof. The gripping claws A5 are provided as a pair on both sides of the mounting shaft A2 so that they can be gripped over the entire inner surface of the steel sheet pile 1. In addition, for example, a large number of teeth parallel to the pulling-out direction are engraved on the gripping surface 23.

In the above configuration, the drawing device A operates as follows. By connecting the connecting pieces 25 and 26 with the fixing pins 27, the gripping surfaces 23 of the pair of gripping claws A5 are held in an open state in which the gripping surfaces 23 are retracted from the inner surface of the steel pipe sheet pile, and the column main body A1 is held.
And a lower chuck portion such as a gripper A5 is fitted to the upper end of the steel sheet pile 1. At this time, the ring-shaped guide plate 19 of the connection fitting A3 serves as a guide, and the gripping claw A5 is smoothly inserted into the steel pipe sheet pile 1. Pull out the fixing pin 27 and set the power casing jack B
When the columnar main body A1 is lifted by, for example, about 50 mm, the mounting shaft A2 rises with respect to the connection fitting A3, and the connecting link A
By the action of 4, the gripping surface 23 of the gripping claw A5 advances toward the inner surface of the steel pipe sheet pile 1 and presses the inner surface of the steel pipe sheet pile 1 to squeeze the steel pipe sheet pile 1 from the inside.

When the columnar main body A1 and the steel pipe sheet pile 1 are integrated and the columnar main body A1 is lifted by the power casing jack B, the steel pipe sheet pile 1 is pulled out. When the holding of the columnar body A1, the lifting of the jack B2 for one stroke, the release of the holding, and the lowering of the jack B2 for one stroke are sequentially repeated, when the steel pipe sheet pile 1 is pulled out to a predetermined height, the columnar body A1 is moved to the jack B2. When it is lowered with respect to the steel sheet pile 1, the gripping claws A5 are opened. When the connecting pieces 25 and 26 are connected by the fixing pin 27, the grip claw A5 is fixed in an open state. The columnar main body A1 is suspended by a crane and removed from the upper end of the steel sheet pile 1.

Further, the drawing of the steel pipe sheet pile 1 is completed,
After the guide wall 6 is removed, grout is injected into the drawing trace portion via the rod 13 of the boring machine 12 as shown in FIG. 6 (eighth step). A known grouting method was used for the grout injection.

[0025]

As described in detail above, the use of the above-mentioned drawing apparatus for drawing out the steel pipe sheet piles after the completion of the construction of the underground structure enables safe and quick operation particularly in an urban area where noise problems are likely to occur. The steel pipe sheet pile can be pulled out. And
The ground improvement and reaction ground improvement have been performed, so there is no danger of ground collapse, and the muddy water is replaced and the soil inside the steel pipe sheet pile is discharged with an auger screw, reducing frictional resistance generated when pulling steel pipe sheet pile. it can.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a state in which the ground behind a steel pipe sheet pile has been improved after the completion of installation work of a common gutter.

FIG. 2 is a schematic view showing a state in which a guide wall has been constructed by backfilling the interior of the common groove and then improving the reaction ground.

FIG. 3 is a schematic view showing a state in which soil in a steel pipe sheet pile is discharged by an auger screw.

FIG. 4 is a schematic diagram showing a state in which muddy water is replaced by an ultra-high pressure injection pump.

FIG. 5 is a schematic diagram showing a state in which a drawing device A is installed on a guide wall.

FIG. 6 is a schematic view showing a state in which grout is injected into a drawing trace of a steel sheet pile.

FIG. 7 is a longitudinal sectional view showing one embodiment of a drawing device A;

[Explanation of symbols]

 1: Steel pipe sheet pile 2: Ground improvement 3: Reaction ground improvement 4: Muddy water replacement part 5: Shoring work 6: Guide wall 7: Junction 8: Auger screw 9: CJG machine A: Drawing device A A1: Column body A2: Mounting Shaft A3: Connection fitting A4: Connection link A5: Gripping claw B: Power casing jack C: Reaction table 10: Ultra-high pressure injection pump 11: Muddy water plant 12: Boring machine 13: Rod 14: Hanging fitting 15: Mounting Substrate 16: Mounting hole 17: Flange 18: Connection board 19: Guide plate 20: Insertion hole 21: Claw member 22: Support lever 23: Gripping surface 24: Pin 25, 26: Connection piece 27: Fixing pin 28: Horizontal pin

Claims (1)

[Claims] (1) At the lower end of a columnar body to which a jack is connected,
A mounting shaft protruding in the pull-out direction is provided, and a connection fitting is provided on the mounting shaft so as to be movable in the pull-out direction. The gripping claw was connected to the tip of the gripping claw and the connection fitting via a connection link, and the columnar body was moved up and down to open and close the gripping claw. A method for drawing a steel pipe sheet pile by a drawing apparatus, wherein the method is performed by the following first to eighth steps after completion of construction of an underground structure. (First step) The underground ground behind the steel sheet pile is improved. (Second step) Temporary equipment during construction is removed and the inside is backfilled. (Third step) The ground around the steel pipe sheet pile is ground-improved to form a reaction force ground for drawing. (Fourth Step) A guide wall for a muddy water replacement work and a jack is constructed around the ground of the steel pipe sheet pile having the improved reaction ground. (Fifth step) The soil inside the steel sheet pile is discharged with an auger screw. (Sixth step) In order to cut off the steel pipe sheet pile and the surrounding ground, muddy water is replaced by an ultra-high pressure injection pump. (Seventh step) The drawing device provided with a reaction table and a power casing jack is installed on the guide wall, and the steel sheet pile is drawn out by the drawing device. (Eighth step) After the drawing is completed, backfill is performed on the drawing trace of the steel pipe sheet pile, and grout is injected as a measure to prevent ground subsidence.