JP6617531B2 - Pulling out the injection tube and existing sheet pile - Google Patents

Description

  The present invention relates to an injection pipe for filling a hollow portion of a natural ground generated in an extraction trace of an existing sheet pile and a method for extracting the existing sheet pile.

  When a temporary earth retaining wall is constructed by continuously placing a plurality of steel sheet piles in the ground and excavation work is performed on the ground, if the steel sheet piles that are no longer needed are pulled out, the extracted traces become hollow. Can easily loosen, and can cause adverse effects such as subsidence and cracks on surrounding structures and underground objects. For this reason, after excavation work is completed, measures are taken such as leaving the steel sheet piles without being pulled out, or filling the steel sheet piles with traces.

  For example, Cited Document 1 discloses a method for drawing a steel sheet pile for filling a steel sheet pile with a filler. Specifically, a steel sheet pile provided with a groove that can accommodate the injection pipe is placed in the ground to construct a temporary earth retaining wall, and construction such as excavation work is performed. After the work is completed, the injection pipe penetrates into the ground so that it follows the groove of the steel sheet pile, and the steel sheet pile and the injection pipe are pulled out while discharging the filler from the tip of the injection pipe. Fill with a filler. Such a method is excellent in workability because the steel sheet pile and the injection tube can be individually penetrated into the ground.

Japanese Patent Laid-Open No. 03-224912

  However, in the above method, when constructing the temporary earth retaining wall, it is necessary to manufacture a steel sheet pile provided with a groove portion that can accommodate the injection pipe in advance, which requires a large cost. In addition, when the above method is adopted for an existing steel sheet pile not provided with a groove, it is not only difficult to penetrate the injection pipe along the existing steel sheet pile but also an injection built in the ground. It cannot be confirmed whether the pipe is in a state along the steel sheet pile.

  On the other hand, a method of drawing an existing steel sheet pile in advance and penetrating an injection tube into the drawing trace and filling the filler is also conceivable. However, in such a method, there is a possibility that the wall surface of the drawing trace may collapse when the steel sheet pile is drawn out, and there is a possibility that the filling material necessary for suppressing the loosening of the ground cannot be filled.

  The present invention has been made in view of such problems, and its main purpose is an injection pipe that can be accurately built along an existing underground structure and an existing sheet pile using the injection pipe. It is to provide a drawing method.

In order to achieve such an object, the injection tube of the present invention is provided with an injection for filling a hollow portion in the ground with a filler inlet near the base end and a filler outlet on the end face of the tip. The filler discharge port is closed by a removable lid member, and the end surface of the tip portion is formed to be inclined with respect to the tube axis, and the lid member includes a flange portion. The flange portion protrudes outward from at least the edge portion of the end surface of the distal end portion closest to the base end portion, and when the injection tube is disposed along the existing sheet pile, the upper surface of the flange portion is It has the length which contact | abuts the lower end surface of the existing sheet pile .

Further, the injection tube of the present invention is an injection tube for filling a filler in a hollow portion in the ground, provided with a filler inlet near the base end and a filler discharge port on the end face of the tip, The filler discharge port is closed by a removable lid member, and the end surface of the tip portion is formed to be inclined with respect to the tube axis, and the lid member is formed on the end surface of the tip portion of the injection tube. It is attached to the lower end side edge via an attaching means, and has a flange, and the flange protrudes outward from the edge closest to the base end at least on the end surface of the distal end. It is characterized by.

According to the above injection tube, by providing the end surface inclined with respect to the tube axis at the tip of the injection tube, the injection tube penetrating into the ground by the pressing force in the tube axis direction is subjected to the action of earth pressure. The tip of the lever advances so as to be pressed against the back side of the end face. Therefore, the injection pipe is arranged by a simple method in which the injection pipe is arranged so that the end surface of the tip portion faces the back with respect to the existing underground structure, and is penetrated into the ground by the pressing force in the pipe axis direction. Can be arranged with high accuracy along the existing underground structure. In addition, since the penetration resistance is significantly reduced as compared with the case where the end face of the distal end portion is orthogonal to the tube axis, it is possible to easily perform the injection tube penetration operation.

In addition, when the injection tube penetrating into the ground is moved in the pulling direction, earth pressure acts on the heel part, so that the lid member can be easily removed from the injection tube.

The drawing method of the existing sheet pile of the present invention uses an injection pipe for filling a hollow portion in the ground, which is provided with a filler inlet near the base end and a filler discharge port on the end face of the tip . An existing sheet pile drawing method , wherein an end surface of the tip portion is formed to be inclined with respect to a tube axis, the filler discharge port is closed by a removable lid member, and the lid member is , Including an eaves portion projecting outward from an edge portion closest to the base end portion of at least an end surface of the distal end portion of the injection tube, and the injection tube is disposed on an existing sheet pile placed in the ground. The injection tube is inserted so that it penetrates into the ground along the outer peripheral surface with the end surface of the tip portion facing back, and the tip portion reaches the lower end surface of the existing sheet pile or the lower end surface. a step of Tatekomu, pulling on that reverses the injection pipe around the pipe axis Is moved to the direction, a step of removing the cover member from the injection tube, while discharging the filling material from the filling material discharge port, it and a step of withdrawing from the ground together with the existing sheet pile the injection tube It is characterized by.

  According to the above-mentioned method for pulling out the existing sheet pile, the injection pipe advances straight while being pressed against the existing sheet pile located on the back side of the end face at the tip by the earth pressure acting on the tip, so that the injection pipe is surely installed. It can be installed along the sheet pile, and it is possible to efficiently fill the filler with respect to the gap portion generated in the extraction trace of the existing sheet pile.

In addition, by reversing the injection tube around the tube axis and moving the collar provided on the lid member to the existing sheet pile side, and moving it in the pulling direction, the lid member's collar and the lower end surface of the existing sheet pile are It can be confirmed whether or not they come into contact. Thereby, it becomes possible to evaluate that the injection tube located in the ground is arranged along the existing sheet pile to the tip without using a detection device or the like.

  According to the present invention, the end surface inclined with respect to the tube axis is provided at the distal end of the injection tube, so that the injection tube is reliably aligned with the existing underground structure located on the back side of the end surface of the distal end portion. Can be built. In addition, by adopting this injection pipe in the method of drawing the existing sheet pile, the filler discharge port of the injection pipe can be reliably arranged with respect to the gap generated in the extraction mark of the existing sheet pile, Can be reliably filled with a filler.

It is a figure which shows the whole injection pipe outline. It is a figure which shows the detail of the cover member attached to the front-end | tip part of an injection tube. It is a figure which shows the other example of the cover member attached to the front-end | tip part of an injection tube. It is a figure which shows the extraction method of the existing sheet pile (the 1). It is a figure which shows the extraction method of the existing sheet pile (the 2). It is a figure which shows the press-fitting extraction machine at the time of extracting an existing sheet pile. It is a figure which shows the other example of the press-fitting extraction machine at the time of extracting an existing sheet pile.

  The injection pipe of the present invention is built along an existing underground structure, and is used when filling a hollow portion generated in a natural mountain with a filler. It may be caused by the cause, and the intrusion direction of the injection pipe into the ground can be adopted in any of the vertical direction and the horizontal direction. In the present embodiment, the injection pipe is vertically penetrated along the existing sheet pile placed in the ground, and the filling material is filled into the void portion generated in the withdrawal trace when the existing sheet pile is removed. A case will be described below with reference to FIGS.

  As shown in FIG. 1, the injection tube 1 is a hollow pipe that is attached to the web 21 of the existing sheet pile 2 that constitutes the temporary earth retaining wall W via the fixing member 3, and the end surface of the base end portion 11 is a filler. It functions as the inflow port 111. Further, as shown in FIG. 2 (b), the distal end portion 12 of the injection tube 1 is formed in an inclined surface inclined with respect to the tube axis and functions as a filler discharge port 121. The hollow portion 1 serves as a flow path for the filler M. In addition, the filler discharge port 121 is not limited to the above-described configuration, and a hole may be formed in a part of the distal end portion 12 of the injection tube 1.

  A lid member 4 for closing the filler discharge port 121 is attached to the end surface of the distal end portion 12 that functions as the filler discharge port 121 as shown in FIG. The lid member 4 prevents earth and sand from flowing into the hollow portion from the filler discharge port 121 when penetrating the injection tube 1 into the ground, and applies earth pressure when penetrating the injection tube 1 into the ground. Provided for efficient reception, the filler discharge port 121 can be closed, has a structure that can be removed, and the end surface of the tip portion 12 has a uniform inclined surface as a whole. As long as it can be formed, it may have any shape.

  For example, in FIG. 2A, a rubber cap fitted to the filler discharge port 121 is employed for the lid member 4, and the filler M flows into the injection tube 1 as shown in FIG. It has a configuration that can be removed by pressing with a long bar from the inside pressing force or the inside of the injection tube 1.

  3A, the lid member 4 employs a plate material disposed so as to block the entire end face of the distal end portion 12 from the outside, and is provided at the edge of the end face of the distal end portion 12 of the injection tube 1 on the lowest end side. It is attached to the end surface of the front end portion 12 via the mounting means 41 such as spot welding or a hinge. Further, the lid member 4 has a flange portion 42 protruding outward from the most proximal end portion 11 of the distal end portion 12 of the injection tube 1, that is, the edge portion on the upper end side, as shown in FIG. As shown in the figure, when the injection pipe 1 built in the ground is moved in the drawing direction, a downward earth pressure acts on the flange 42, so the lid member 4 rotates around the mounting means 41 as a fulcrum. It will be in the state removed from the end surface of the front-end | tip part 12. FIG.

  When these lid members 4 are installed at the distal end portion 12 of the injection tube 1, all of the lid members 4 not only block the end surface of the distal end portion 12 but also become a uniform inclined surface that is inclined with respect to the tube axis. When penetrating inside, it becomes the pressure receiving surface of earth pressure. As a result, the injection tube 1 penetrating into the ground by the pressing force in the tube axis direction advances while being pressed against the back side of the end surface of the tip portion 12 by the horizontal component of earth pressure acting on the end surface of the tip portion 12. Thus, the inclination direction of the injection tube 1 that is likely to occur when penetrating into the ground can be controlled within a vertical plane perpendicular to the end surface of the distal end portion 12.

  Therefore, as shown in FIG. 2 (a) and FIG. 3 (a), if the injection tube 1 penetrates into the ground so that the end face of the distal end portion 12 faces the web 21 of the existing sheet pile 2, The injection tube 1 travels in the ground while being pressed against the existing sheet pile 2, so that it can be reliably built along the existing sheet pile 2. Further, by making the end surface of the distal end portion 12 of the injection tube 1 into an inclined surface that is inclined with respect to the tube axis, the end surface of the distal end portion 12 is orthogonal to the tube axis when the injection tube 1 penetrates into the ground. Since the penetration resistance can be greatly reduced as compared with the case where the injection tube 1 is present, the penetration operation of the injection tube 1 into the ground can be easily performed.

  In the lid member 4 made of the plate material shown in FIG. 3, the flange portion 42 is not necessarily provided, and when provided, the flange portion 42 may have a larger area than the end surface of the distal end portion 12 of the injection tube 1. Any shape may be used. Also, the attachment position of the attachment means 41 may be any as long as it is an edge portion of the end face of the distal end portion 12 of the injection tube 1. However, with the configuration shown in FIG. 3A as described above, the position of the distal end portion 12 in the injection tube 1 can be easily evaluated on the ground.

  Specifically, when removing the cover member 4 of the injection tube 1 built in the ground, the injection tube 1 is inverted around the tube axis so that the collar portion 42 of the cover member 4 is connected to the web 21 side of the existing sheet pile 2. Place it toward the. Then, when the injection tube 1 is moved in the drawing direction, if it is built along the existing sheet pile 2 up to the distal end portion 12, the collar portion 42 is formed on the lower end surface of the web 21 as shown in FIG. Abut. Thereby, the worker who performs the erection work of the injection tube 1 is applied to the existing sheet pile 2 until the injection tube 1 reaches the distal end due to the impact that the collar portion 42 of the lid member 4 contacts the web 21 of the existing sheet pile 2. After confirming that it is along, the lid member 4 can be removed by moving the injection tube 1 in the drawing direction.

  Thus, by performing the removal operation of the lid member 4, the position of the distal end portion 12 of the injection tube 1 with respect to the existing sheet pile 2 can be easily evaluated. When the position of the distal end portion 12 in the injection tube 1 is confirmed by this method, when the injection tube 1 is moved in the drawing direction, the lid member 4 is rotated only by earth pressure acting on the collar portion 42. The lid member 4 may be attached to the injection tube 1 with such strength that it does not move.

  As shown in the side view of FIG. 4B, the injection hose 5 is installed at the base end portion 11 via the cap 6 in the injection tube 1 from which the lid member 4 has been removed in this manner. The filler M is supplied to the injection tube 1. Thereby, the filler M supplied from the injection hose 5 is supplied from the filler discharge port 121 to the underground space through the filler inlet 111 and the hollow portion of the injection tube 1.

  Next, the method of pulling out the existing sheet pile 2 using the injection tube 1 described above will be described below with reference to FIGS.

  In the present embodiment, a hat-type steel sheet pile is adopted for the plurality of existing sheet piles 2 constituting the temporary earth retaining wall W. However, the existing sheet pile 2 is not necessarily limited to this, and a U-type steel sheet pile or a linear steel sheet pile is used. , Steel pipe sheet pile etc. may be used. In addition, any filler may be adopted as the filler M, but in this embodiment, a water shielding material made of an inorganic gel composition is adopted.

  In addition, the water shielding material which consists of an inorganic type gel-like composition does not contain solidified substances, such as cement, but is a material which does not become an underground obstruction in the future, which mainly consists of sand and bentonite. The characteristic is that it is made of an inorganic material, so that deterioration due to microorganisms hardly occurs, and the function as a filler can be satisfactorily maintained for a long time in the filled void. In addition, since it consists of a gel-like composition, it is rich in deformation followability, for example, even if the cross-sectional shape of the void formed in the ground due to deformation of the surrounding ground due to an earthquake or the like changes, Following the shape, the deformation can be followed, and the space can be filled constantly and densely.

First, as shown in the plan view of FIG. 4A, the injection tube 1 is built into the ground along the existing sheet pile 2 that is placed in the ground.
When the injection tube 1 is built into the ground, as shown in FIG. 2A, the outer peripheral surface is a web of the existing sheet pile 2 with the end surface of the distal end portion 12 facing away from the existing sheet pile 2. Position along 21 and penetrate into the ground. In this way, the injection tube 1 is moved straight while being pressed against the existing sheet pile 2 by earth pressure acting on the end face of the distal end portion 12, and is reliably built along the existing sheet pile 2 over the entire length without being separated from the existing sheet pile 2. .

When the distal end portion 12 of the injection tube 1 reaches below the lower end surface of the existing sheet pile 2, the penetration operation is stopped, and the lid member 4 closing the filler discharge port 121 of the injection tube 1 is removed.
Any method may be used to remove the lid member 4, but in the present embodiment, the method shown in FIG. 3C described above, which can confirm the position of the distal end portion 12 of the injection tube 1, is performed. That is, after the injection tube 1 is inverted around the tube axis, the injection tube 1 is moved in the drawing direction. Thus, the lid member 4 is removed while confirming the position of the distal end portion 12 of the injection tube 1 with respect to the existing sheet pile 2. When it is not possible to confirm that the flange 42 of the lid member 4 is in contact with the existing sheet pile 2 when the injection tube 1 is moved in the pulling direction, the injection tube 1 is pulled out as it is, and it is built into the ground again. Perform the work.

  After removing the lid member 4 in the above operation, the injection tube 1 is fixed to the web 21 of the existing sheet pile 2 via the fixing member 3 as shown in FIG. The injection hose 5 is attached to the part 11 via the cap 6. In this embodiment, three injection tubes 1 are prepared, and the injection tubes 1 are fixed to each of the three existing sheet piles 2 at a time. However, the number is not necessarily limited to this. Only one tube 1 may be used.

  Thereafter, while discharging the filler M from the filler discharge port 121, as shown in the side view of FIG. 4C, one existing sheet pile 2 is pulled up at a constant speed together with the injection pipe 1 fixed thereto. Thus, as shown in the side view of FIG. 5A, the cavity M generated in the trace of the existing sheet pile 2 is filled with the filler M. In addition, the existing sheet pile 2 is not necessarily limited to the method of pulling out one by one, and a plurality of the existing sheet piles 2 may be pulled out.

  The drawn-out injection tube 1 releases the fixation with the existing sheet pile 2 by the fixing member 3, and again penetrates along the other existing sheet pile 2 penetrating into the ground as shown in FIG. 5 (a). Then, the above steps are repeated. When all the existing sheet piles 2 constituting the temporary earth retaining W are removed, as shown in the plan view of FIG. 5B, all of the extraction traces are filled with the filler M, and the existing sheet piles 2 are pulled out. There will be no loosening of the surrounding ground.

  In addition, the extraction method of the injection tube 1 and the existing sheet pile 2 of this invention is not limited to the said embodiment, It cannot be overemphasized that a various change is possible in the range which does not deviate from the meaning of this invention. .

  For example, in the present embodiment, a hollow pipe having a circular cross-sectional view is adopted as the injection tube 1, but the present invention is not limited to this, and the surface of the existing sheet pile 2 such as a hollow pipe having a square cross-sectional view is not limited thereto. You may have a flat part which can contact | connect on an outer peripheral surface.

  Moreover, the height position at the time of attaching the injection pipe 1 with respect to the existing sheet pile 2 is equipped with the press-fitting and drawing device 7 used when pulling out the existing sheet pile 2, respectively, and the chuck 8 for gripping the existing sheet pile 2. It may be changed as appropriate according to the shape.

  For example, as shown in FIG. 6, when the chuck 8 provided in the press-fitting / withdrawing device 7 has a structure for gripping the web 21 of the existing sheet pile 2, the existing sheet pile is secured to secure the gripping area of the chuck 8. The upper end of the injection tube 1 is disposed at a position lower than the upper end of 2. In this case, the injection pipe 5 connected to the injection pipe 1 may be piped outside the press-fitting / drawing device 7. On the other hand, as shown in FIG. 7, when the chuck 8 provided in the press-fitting / drawing device 7 has a structure for holding the flange 22 of the existing sheet pile 2, the upper end of the injection pipe 1 with respect to the existing sheet pile 2. The part may be arranged at any height position, and the injection pipe 5 can also be arranged to penetrate the drawing device 7.

  Moreover, in this Embodiment, after moving the injection tube 1 to the drawing-out direction and removing the cover member 4, the injection tube 1 was fixed to the existing sheet pile 2 with the fixing member 3, but it does not necessarily limit to this. Absent. For example, when the lid member 4 made of the rubber cap shown in FIG. 2 is removed by the pressing force by the injection of the filler M, the existing sheet pile 2 is inserted by the fixing member 3 after penetrating the injection tube 1 into the ground. The filling member M may be supplied by connecting the injection pipe 5 to the injection pipe 1 and the lid member 4 may be removed. At this time, when the injection tube 1 provided with the lid member 4 made of a rubber cap is installed so that the lowermost end portion of the end surface of the distal end portion 12 is the same as the lower end surface of the existing sheet pile 2 or reaches below the lower end surface. Good.

DESCRIPTION OF SYMBOLS 1 Injection pipe 11 Base end part 111 Filling material injection port 12 Tip part 121 Filling material discharge port 2 Existing sheet pile 21 Web 22 Flange 3 Fixing member 4 Lid member 41 Attachment means 42 Gutter part 5 Injection hose 6 Cap 7 Press-in drawing apparatus 8 Chuck W Temporary earth retaining wall M Filler

Claims (3)

An injection pipe for filling a filler in a hollow portion in the ground, comprising a filler inlet near the base end and a filler discharge port on the end face of the tip,
The filler discharge port is closed by a removable lid member,
The end surface of the tip is formed to be inclined with respect to the tube axis,
The lid member includes a flange, and the flange protrudes outward from an edge closest to the base end of at least the end surface of the distal end, and when the injection tube is disposed along the existing sheet pile In addition, the injection tube is characterized in that the upper surface of the flange has a length that abuts against the lower end surface of the existing sheet pile . An injection pipe for filling a filler in a hollow portion in the ground, comprising a filler inlet near the base end and a filler discharge port on the end face of the tip,
The filler discharge port is closed by a removable lid member,
The end surface of the tip is formed to be inclined with respect to the tube axis,
The lid member is attached to the lower end side edge portion of the end surface at the distal end portion of the injection tube via an attaching means, and includes a collar portion,
The injection tube characterized in that the flange protrudes outward from at least an edge portion of the end surface of the distal end portion closest to the proximal end portion . A method for extracting an existing sheet pile using an injection pipe for filling a filler in a hollow portion in the ground, comprising a filler inlet near the base end and a filler discharge port on the end face of the tip ,
The end surface of the tip is formed to be inclined with respect to the tube axis,
The filler discharge port is closed by a removable lid member, and the lid member protrudes outward from an edge portion closest to the base end portion of at least the end surface of the injection tube. Department,
With respect to the existing sheet pile placed in the ground, the injection tube penetrates into the ground along the outer peripheral surface with the end surface of the tip portion facing back, and the tip portion is below the existing sheet pile. The step of installing the injection tube so as to reach the same end surface or below the lower end surface;
Removing the lid member from the injection tube by moving the injection tube around the tube axis and then moving in the drawing direction ;
While discharging the filler from the filler discharge port, withdrawing the injection tube from the ground together with the existing sheet pile,
The drawing method of the existing sheet pile characterized by comprising.

Images