JP4113150B2 - Water stop method for steel pipe sheet pile joints - Google Patents

Description

  The present invention relates to a water stopping method for a steel pipe sheet pile joint.

  Conventionally, when a steel pipe sheet pile is formed by connecting steel pipes, it is common to use joints of PP type, LT type, and PT type. In addition, a joint such as LL type is used. In order to form a joint part, the inside of the joint is excavated and filled with a water-stopping material such as mortar.

  For water stoppage of the PP type joint, a flexible bag is inserted into the joint, filled with water in the bag, inflated, pressurized and expanded, and then filled with a hydraulic sealing material in the remaining part ( For example, see Patent Document 1. For water stoppage of the LT joint, a method is provided in which a flexible annular member is provided in one joint, and a fluid is supplied to the annular member to expand the diameter when the waterstop material is injected (for example, see Patent Document 2). )

There is a method (for example, refer to Patent Document 3) in which a water stop member is installed in a T type joint and a cross section is expanded by filling a fluid in a hollow portion. There is a method (for example, refer to Patent Document 4) in which a water blocking material such as a water-swelling rubber is provided in one joint and then filled with a water blocking material.
JP-A-55-105024 JP-A-1-163313 JP 2002-266344 A JP 2003-55958 A

  However, when mortar is filled in a bag-shaped grout jacket, the strength may be insufficient. Moreover, when a member for water stop is provided in one joint and the gap between the joints is sealed, there is a possibility that the member for water stop may be damaged by the other joint hardware when the steel pipe is driven.

  The present invention has been made in view of such a problem, and the object of the present invention is to reliably stop water between joints without damaging a member for water stop when a steel pipe is installed. It is providing the water-stop method of the steel pipe sheet pile joint which can be performed.

In order to achieve the above-described object, the present invention includes a first joint formed by fixing a steel material along the axial direction on the first steel pipe, and a steel material fixed along the axial direction on the second steel pipe. In this case, the first joint is connected to the first steel pipe so that the arm portion faces inward. A female joint formed by fixing a pair of L-shaped steel materials, and disposed along the outer surface axial direction of the first steel pipe in the vicinity of a joint portion between the pair of L-shaped steel materials and the first steel pipe has been contact with the flat tubes and the second joint, the first while preventing the protective bars which are fixed along the axial direction to the joint, the first joint and the second joint after combining the bets, it is inflated so that the cross section diameter of the tube by injecting a fluid to expand the flat tubes It makes it waterproofing method of steel sheet pile joint, characterized in that to seal the gap between the second joint and the first joint.

  The first joint is, for example, a female joint formed by fixing a pair of L-shaped steel materials to the first steel pipe so that the arm portion faces inward, and the second joint is a second joint. This is a male joint formed by fixing a pair of L-shaped steel materials to a steel pipe so that the arm portion faces outward. A flat tube is arrange | positioned along the outer surface axial direction of a 1st steel pipe, for example in the joint part vicinity of a 1st steel pipe and a pair of L-shaped steel materials which form a female joint. In this case, the protective bar is fixed to the side of the tube along the outer surface axial direction of the first steel pipe. The protective bar is preferably round steel.

  The flat tube has a lower end fixed to the first steel pipe in a flat shape. The tube is made of rubber, has fibers that restrain the elongation in the vertical direction, and expands only in the cross-sectional direction. The cross-sectional diameter of the tube shall be expanded more than twice. The tube may be composed of a plurality of parts. In this case, the plurality of portions are connected by separate expandable members that surround the outer periphery. The expandable separate member is assumed to expand the diameter following the tube.

  In the present invention, the first tube formed by fixing the steel material along the axial direction to the first steel pipe is fixed along the axial direction with the flat tube disposed along the axial direction. A protective bar is provided. And while preventing the contact with the 2nd joint formed by fixing steel materials to the 2nd steel pipe along an axial direction, and a flat tube with a protection bar, the 1st joint and 2nd Combine with fittings. Thereafter, the gap between the first joint and the second joint is sealed by injecting a fluid into the flat tube and expanding it.

  According to the water stop method for steel pipe sheet pile joints of the present invention, water can be reliably stopped between the joints without damaging members for water stop when the steel pipe is installed.

  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 1. As shown in FIG. 1, the steel pipe sheet pile 1 is formed by connecting a plurality of steel pipes 3 with joints 5. The joint 5 is formed by combining a female joint 8 and a male joint 10 fixed to the steel pipe 3 and filling a filler 23 such as mortar inside.

  2 is an elevation view of the steel pipe 3, FIG. 3 is a cross-sectional view of the steel pipe sheet pile 1 cut along a horizontal plane, and FIG. 4 is a cross-sectional view of the steel pipe sheet pile 1 cut along a vertical plane. 2 is a cross-sectional view taken along line AA in FIG. 3, and FIG. 4 is a cross-sectional view taken along line BB in FIG.

  As shown in FIG. 3, the male joint 10 of the joint 5 has a pair of L-shaped steel members 9 arranged so that the arm portions 9 b face outward, and the leg portions 9 a are fixed to the outer surface of the steel pipe 3. It is formed. The steel material 14 is arrange | positioned in the part pinched | interposed into a pair of L-shaped steel materials 9 among the outer peripheral surfaces of the steel pipe 3. FIG. The L-shaped steel material 9 and the steel material 14 are installed along the axial direction of the steel pipe 3.

  As shown in FIGS. 2 to 4, the female joint 8 of the joint 5 has a pair of L-shaped steel materials 7 arranged with the arm portions 7 b facing inward, and the leg portions 7 a on the outer surface of the steel pipe 3. Fixed and formed. A rubber tube 13, a protective round steel 11, and a steel material 14 are disposed on a portion sandwiched between a pair of L-shaped steel materials 7 on the outer peripheral surface of the steel pipe 3. The L-shaped steel material 7, the rubber tube 13, the protective round steel 11, and the steel material 14 are provided along the axial direction of the steel pipe 3.

  The rubber tube 13 has a flat shape and is disposed in the vicinity of a joint portion between the leg portion 7 a of the L-shaped steel material 7 and the steel pipe 3. The lower end portion of the rubber tube 13 is fixed to the outer peripheral surface of the steel pipe 3 by a fixing member 17 in a flat state. The fixing member 17 is composed of, for example, a plate and a screw. A pressure protection tube 19 is provided at the upper end of the rubber tube 13. When the rubber tube 13 is composed of a plurality of portions 12, the plurality of portions 12 are joined using a joint material 15 that surrounds the outer periphery of the rubber tube 13.

  The rubber tube 13 has a warp reinforcing layer along the axial direction that is not braided. This reinforcing layer reinforces the surface layer of the rubber tube. The rubber tube 13 expands by filling the fluid 21 (FIGS. 5 and 6) therein, but does not extend in the axial direction because it has a warp reinforcing layer. The rubber tube 13 extends only in the circumferential direction and expands in diameter by 2 times or more.

  The joint material 15 is made of the same material as the rubber tube 13 and extends following the rubber tube 13. By using the joint material 15, it is possible to cope with a change in the length of the steel pipe 3. The pressurizing protective tube 19 is a device for suppressing excessive expansion and elongation of a portion of the rubber tube 13 exposed in the axial direction from the steel tube 3, and also serves as a pressure inlet to the rubber tube 13.

  The protective round steel 11 is arranged on the side of the rubber tube 13 and is fixed to the steel pipe 3. As shown in FIG. 3, the protective round steel 11 can prevent the rubber tube 13 from being damaged due to contact with the L-shaped steel material 9 when the male joint 10 and the female joint 8 are combined. Fixed in position. When the protective round steel 11 is in contact with the arm portion 9b of the L-shaped steel material 9, a gap is generated between the rubber tube 13 and the arm portion 9b of the L-shaped steel material 9, and the rubber tube 13 and the arm portion 9b are formed. Do not touch.

  The steel material 14 is disposed between the two protective round steel bars 11 and fixed to the steel pipe 3. Each of the steel material 14 in the female joint 8 and the steel material 14 in the male joint 10 is a deformed steel bar or the like, and is a member for ensuring adhesion between the steel pipe 3 and the mortar 23 (FIG. 7).

  In order to form the joint 5 of the steel pipe sheet pile 1 as shown in FIG. 1, first, as shown in FIGS. 3 and 4, the male joint 10 of the adjacent steel pipe 3 is connected to the female joint 8 of the existing steel pipe 3. The steel pipe 3 is driven into the ground while inserting.

  Since the reinforcing layer provided on the surface layer of the rubber tube 13 is formed as a warp reinforcing layer along the driving direction when the steel pipe 3 is driven, damage to the rubber tube 13 due to the influence of earth and sand can be suppressed. Moreover, damage to the rubber tube 13 due to contact with the arm portion 9b can be avoided by the protective round steel 11. Furthermore, since the lower end portion of the rubber tube 13 is fixed to the steel pipe 3 by the fixing member 17 in a flat state, the insertion resistance when the steel pipe 3 is driven is small.

  FIG. 5 is a cross-sectional view of the steel pipe sheet pile 1 cut along a horizontal plane, and FIG. 6 is a cross-sectional view of the steel pipe sheet pile 1 cut along a vertical plane. After combining the male joint 8 and the female joint 10 as shown in FIGS. 3 and 4, the earth and sand (not shown) in the joint 5 is cut as shown in FIGS. The fluid 21 is filled therein. The fluid 21 is, for example, water or air. As described above, the rubber tube 13 expands only in the circumferential direction.

  The rubber tube 13 expanded by the filling of the fluid 21 comes into contact with the leg portion 7a of the L-shaped steel material 7 of the female joint 8 and the arm portion 9b of the L-shaped steel material 9 of the male joint 10, and the female joint 8 The gap between the male joint 10 is sealed. Thereby, inflow of water and earth and sand into the joint 5 from the outside can be prevented.

  FIG. 7 is a cross-sectional view of the steel pipe sheet pile 1 cut along a horizontal plane. As shown in FIGS. 5 and 6, after the rubber tube 13 is expanded and the female joint 8 and the male joint 10 are water-stopped, as shown in FIG. 7, the female joint 8 and the male joint are used. 10 is filled with mortar 23 to complete the joint 5. By fixing the steel material 14 to the steel pipe 3 in the joint 5, adhesion between the mortar 23 and the steel pipe 3 can be ensured.

  As described above, according to the present embodiment, the rubber tube 13 provided in the joint 5 is inflated to stop water between the female joint 8 and the male joint 10. Is flat, and the lower end is fixed to the steel pipe 3 in a flat state, so that the insertion resistance at the time of driving is small. The rubber tube 13 can correspond to the steel pipes 3 of various lengths by joining and forming the plurality of portions 12 using the joint material 15 made of the same material.

  Further, since the reinforcing layer provided on the surface layer of the rubber tube 13 is formed as a warp reinforcing layer along the driving direction, it is possible to suppress damage to the rubber tube 13 due to the influence of earth and sand when the steel pipe 3 is driven. it can. Further, when the female joint 8 is provided with the protective round steel 11 and combined with the male joint 10 and the female joint 8, there is a gap between the rubber tube 13 and the arm portion 9b of the L-shaped steel material 9. By making the protective round steel 11 abut on the arm portion 9b, damage to the rubber tube 13 due to contact with the arm portion 9b when the steel pipe 3 is driven can be avoided.

  FIG. 8 shows a horizontal cross-sectional view of the joint 5 when the distance between the steel pipes 3 is narrower than that in FIG. 8A shows a joint when the distance between the steel pipes 3 is slightly narrower than that of FIG. 3, and FIG. 8B shows a joint when the distance between the steel pipes 3 is even narrower than that shown in FIG. 8A. 5 is a horizontal sectional view of FIG.

  In this embodiment, as shown in FIGS. 8A and 8B, the rubber tube 13 is filled with the fluid 21 and expanded even when the distance between the steel pipes 3 is narrow. 13 is brought into contact with the leg portion 7 a of the L-shaped steel material 7 of the female joint 8 and the arm portion 9 b of the L-shaped steel material 9 of the male joint 10.

  The diameter of the rubber tube 13 in the natural state and the width in the flat state are determined according to the dimensions of the L-shaped steel material 7 and the L-shaped steel material 9 and the installation position, but the rubber tube 13 whose diameter is expanded twice or more is used. By using, even when there is variation in the interval between the steel pipes 3 after being driven in, the water can be reliably stopped.

  The installation position of the rubber tube 13 may not be the outer peripheral surface of the steel pipe 3 of the female joint 8. The rubber tube 13 may be provided on the arm portion 9b of the L-shaped steel material 9 of the male joint 10 (the surface facing the arm portion 7b of the L-shaped steel material 7 of the female joint 8). In this case, a protective round steel 11 having a size and a shape that can prevent contact between the rubber tube 13 and the female joint 8 when the steel pipe 3 is driven is fixed to the side of the rubber tube 13.

  Further, the rubber tube 13 may be provided on the arm portion 7b of the L-shaped steel material 7 of the female joint 8 (surface facing the arm portion 9b of the L-shaped steel material 9 of the male joint 10). In this case, a protective round steel 11 having a size and a shape that can prevent contact between the rubber tube 13 and the male joint 10 when the steel pipe 3 is driven is fixed to the side of the rubber tube 13.

  Further, in addition to the protective round steel bar 11, a protective bar having a different shape may be used. The joint material 15 of the rubber tube 13 is provided as necessary, and the installation location is not limited to one.

  As mentioned above, although preferred embodiment of the water stop method of the steel pipe sheet pile joint concerning this invention was described referring an accompanying drawing, this invention is not limited to this example. It will be obvious to those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

  For example, the type of steel pipe joint is not limited to the LL type shown in FIGS. The rubber tube may be installed at a position where it can contact both the male joint and the female joint during expansion to seal the gap and prevent inflow of earth and sand and water from the outside into the joint. At this time, the protective bar is installed at a position where contact between the male joint and the rubber tube or between the female joint and the rubber tube can be prevented.

Perspective view of steel pipe sheet pile 1 Elevated view of steel pipe 3 Sectional view of steel pipe sheet pile 1 cut along a horizontal plane Sectional view of steel sheet pile 1 cut along a vertical plane Sectional view of steel pipe sheet pile 1 cut along a horizontal plane Sectional view of steel sheet pile 1 cut along a vertical plane Sectional view of steel pipe sheet pile 1 cut along a horizontal plane Horizontal sectional view of the joint 5 when the interval between the steel pipes 3 is narrow

Explanation of symbols

1. Steel pipe sheet pile 3 ... Steel pipe 5 ... Fittings 7, 9 ... L-shaped steel materials 7a, 9a ... Legs 7b, 9b ... Arm parts 8 ... Female fittings 10 ... …… Male fitting 11 ……… Protective round steel 13 ……… Rubber tube 15 ……… Joint material 17 ……… Fixing member 21 ……… Fluid 23 ……… Mortar

Claims (6)

A first joint formed by fixing a steel material along the axial direction on the first steel pipe and a second joint formed by fixing the steel material along the axial direction on the second steel pipe; A water stopping method when forming a steel pipe sheet pile,
The first joint is a female joint formed by fixing a pair of L-shaped steel materials to the first steel pipe so that the arm portion faces inward.
The contact between the flat tube disposed along the outer surface axial direction of the first steel pipe and the second joint in the vicinity of the joint between the pair of L-shaped steel materials and the first steel pipe , After combining the first joint and the second joint while preventing by a protective bar fixed to the first joint along the axial direction,
A steel pipe sheet pile joint that seals a gap between the first joint and the second joint by injecting a fluid into the flat tube so as to expand the cross-sectional diameter of the tube. Water stop method. Said second joint is in the second steel pipe arm of claim 1, wherein it is a male joint formed by fixing a pair of L-shaped steel so as to outwardly Water stop method for steel pipe sheet pile joints. 2. The water stop method for a steel pipe sheet pile joint according to claim 1, wherein the protective bar is fixed to a side of the tube along an outer surface axial direction of the first steel pipe. The tube, steel pipe piles joint waterproofing method of claim 1, wherein a lower end portion is fixed to the flat on the first steel tube.   The method for water stoppage of a steel pipe sheet pile joint according to claim 1, wherein the tube is made of rubber, has a fiber constraining longitudinal elongation, and expands only in a cross-sectional direction.   The water stopping method for a steel pipe sheet pile joint according to claim 1, wherein the tube is composed of a plurality of parts, and the plurality of parts are connected by an inflatable separate member that surrounds an outer periphery.

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