JP2006169878A - Joint-section cutoff structure and joint-section cutoff method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint-section cutoff structure capable of obtaining a sufficient cutoff effect. <P>SOLUTION: Cylindrical junctions 1B and 2B are installed to steel-pipe-sheet piles 1A and 2A, slits 1C and 2C are formed to the junctions 1B and 2B and the junctions 1B and 2B are joined mutually by fitting the junctions 2B and 1B to the slits 1C and 2C respectively. A water-swelling grout jacket 40 is inserted into a central space formed between the junctions 1B and 2B, the inside of the grout jacket 40 is filled with a grout 5 and a cutoff is conducted by swelling the grout jacket 40. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a sheet pile joint water stop structure and a joint part water stop method.

  Existing sheet piles are driven around the foundations of revetment structures on coasts and rivers, mountain retaining walls, well foundations and retaining walls. As an example of such a sheet pile, a steel pipe sheet pile as shown in FIG. 12 or a concrete sheet pile as shown in FIG. 9 is known.

  Here, when joining adjacent steel pipe sheet piles, for example, as shown in FIG. 1, one steel pipe sheet pile 1A is provided with a cylindrical junction 1B along the vertical direction on the outer circumferential surface thereof. A slit 1C is formed along the axial direction. The other steel pipe sheet pile 2A is provided with a cylindrical junction 2B along the vertical direction on the outer peripheral surface thereof, and a slit 2C is formed along the axial direction of this junction 2B. In addition, junction 1B, 2B, ... is provided in the both sides of steel pipe sheet pile 1A, 2A, ... (refer FIG. 12).

  And when connecting steel pipe sheet piles 1A and 2B, junction 1B and junction 2B are mutually joined by fitting junction 2B and 1B to each slit 1C and 2C, respectively (for example, refer to patent documents 1). .

  At this time, in FIG. 1, for example, if one of the upper part and the lower part is the excavation side, the slits 1C, 2C at the time of excavation can be obtained simply by fitting the junctions 2B, 1B to the slits 1C, 2C as described above. As a result, water leaks through the pipes and hinders excavation.

Therefore, a grout jacket 4 made of a cylindrical bag is inserted into the space between the junction 1B and the junction 2B, which is generated by joining the junctions 1B and 2B, to the bottom end of the junctions 1B and 2B. Grout 5 is injected into 4 to prevent water leakage through slits 1C and 2C, that is, water stoppage. In this case, since the injected grout 5 may be leaked through the slits 1 </ b> C and 2 </ b> C until the injected grout 5 is cured, the water stop effect is usually enhanced by the injection pressure applied to the grout 5.
JP 2004-2111379 A

  However, in the above prior art, a gap is formed between the inner walls of the junctions 1B and 2B and the grout jacket 4 due to breathing of the grout 5, dilution with ground water, etc., until the grout 5 is hardened. There is a problem in that the front end of the jacket 4 is sloppy and a sufficient water stop effect cannot be obtained.

  Further, for example, as shown in FIG. 7, when the distance between the steel pipe sheet piles 1A and 2B is opened more than the design value, the central space between the junctions 1B and 2B becomes relatively narrow, so that the grout jacket 4 It is easy to cause throat and wrinkles. When bulging or wrinkling occurs in the grout jacket 4, an unfilled portion of the grout 5 is generated, and in this case as well, a sufficient water stop effect cannot be obtained.

  The subject of this invention is providing the joint part water stop structure and the joint part water stop method which can acquire sufficient water stop effect.

  In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that a joint portion is provided on a plurality of sheet piles, and a space formed between the joint portion and the joint portion when the joint portions are joined to each other. Further, a water swollen grout jacket is inserted, and the water swollen grout jacket is filled with grout, and the water swollen grout jacket swells to stop water.

  According to the above configuration, since the water swelling grout jacket is inserted in the space formed between the joint portion and the joint portion, the water swelling grout jacket is filled with the grout in the water swelling grout jacket. Swells with surrounding water. Thereby, the inside of the space can be closed and sufficient water stop can be performed.

  When the sheet pile is a steel pipe sheet pile in claim 1, the invention according to claim 2 is a cylindrical junction provided along the vertical direction on the outer peripheral surface of the steel pipe sheet pile, and A slit is formed in the junction along the axial direction, and a junction-side junction is fitted into the slit, and the junction is joined to each other to form the space between the junctions. It is characterized by.

  According to the above configuration, when two junctions are joined, a space is formed between the two junctions by fitting each junction on the mating side into a slit formed in each junction. A water swollen grout jacket filled with grout can be inserted.

  When the sheet pile is a concrete sheet pile according to claim 1, the joint portion is formed on both sides of the concrete sheet pile, and recesses are formed on end surfaces of the both sides. The end surfaces of the both side portions are joined to each other, whereby the space is formed by the concave portion and the concave portion of the end surface on the mating counterpart side.

  According to the above configuration, when the end surfaces of the two concrete sheet piles are joined to each other, a space is formed by the recess formed in the end surfaces, and a water-swelled grout jacket filled with grout can be inserted into the space.

  Invention of Claim 4 is invention about the joint part water stop method. That is, in the invention according to claim 4, when joint portions provided on a plurality of sheet piles are joined to each other, a water swelling grout jacket is inserted into a space formed between the joint portions and the joint portions. Further, the water swollen grout jacket is filled with grout, and the water swollen grout jacket is swollen to stop the joint between the joint portions.

  According to the present invention, the water-swelled grout jacket is inserted in the space between the junctions produced by joining the junctions or in the space formed by the recesses of the end faces when joining the concrete sheet piles. The grouting jacket is swollen by the surrounding water, and thereby a sufficient water-stopping effect can be obtained.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is described in the location same as a prior art.

  1 and 2 show a joint water stop structure according to the present invention, FIG. 1 is a horizontal sectional view thereof, and FIG. 2 is a sectional view taken along line AA of FIG. In this joint part water stop structure, among the adjacent steel pipe sheet piles 1A, 2A, one steel pipe sheet pile 1A has a cylindrical junction 1B along the vertical direction on the outer peripheral surface, and the other steel pipe sheet pile 2A has its Cylindrical junctions 2B are provided on the outer peripheral surface along the vertical direction. In addition, a slit 1C is formed along the axial direction of the junction 1B, and a slit 2C is formed along the axial direction of the junction 2B. Although not shown in the figure, the junction 1B is provided on both sides of the steel pipe sheet pile 1A, and the junction 2B is also provided on both sides of the steel pipe sheet pile 2A.

  Then, the junction 2B is fitted into the slit 1C of the junction 1B, and the junction 1B is fitted into the slit 2C of the junction 2B, and the junction 1B and the junction 2B are joined to each other.

  In the present embodiment, a water swelling grout jacket 40 made of a cylindrical bag is formed in the space formed by joining the junctions 1B and 2B (a space is formed at the center and its left and right, but here the center space). 1B and 2B are inserted to the bottom of the tip. The water swollen grout jacket 40 is filled with grout 5. The grout 5 is sufficiently filled so that the water-swelled grout jacket 40 contacts the inner surfaces of the junctions 1B and 2B except for the bottom in the space.

  Here, a procedure from when the steel pipe sheet piles 1A and 2A are driven until the grout 5 is injected into the water swelling grout jacket 40 will be described.

  First, the steel pipe sheet piles 1A and 2A are driven. At this time, the junction 1B on the steel pipe sheet pile 1A side is fitted into the slit 2C on the steel pipe sheet pile 2A side, and the junction 2B on the steel pipe sheet pile 2A side is fitted into the slit 1C on the steel pipe sheet pile 1A side. The junction 1B and the junction 2B are joined. Thereafter, the inside of the space formed by joining the junction 1B and the junction 2B is washed to the bottom using high-pressure water.

  Next, the water swelling grout jacket 40 made of a cylindrical bag is inserted into the space at the center up to the bottoms of the tips of the junctions 1B and 2B. When the water swollen grout jacket 40 is inserted, in this embodiment, the lower portion of the water swollen grout jacket 40 is connected to the weight 41 via the suspension member 42 as shown in FIG. The water swelling grout jacket 40 is inserted into the space using the weight of the weight 41.

  Then, a grout injection rod (not shown) is set inside the water swelling grout jacket 40, and the grout 5 is injected into the water swelling grout jacket 40. Until the injected grout 5 is hardened, there is a risk of water leakage through the slits 1C and 2C. Therefore, the leakage of water is prevented by the injection pressure of the grout 5 as in the prior art.

  As another example of inserting the water swollen grout jacket 40 in the space between the junctions 1B and 2B, as shown in FIG. 6, a rod 43 for injecting grout is inserted into the water swollen grout jacket 40 in advance, In this state, there is a method in which the water swelling grout jacket 40 is inserted into the space together with the rod 43 to the bottoms of the junctions 1B and 2B. In this case, the rod 43 is pulled upward while injecting the grout 5 into the water swelling grout jacket 40 through the rod 43.

  According to the above configuration, the water swollen grout jacket 40 is inserted in the space between the junctions generated by joining the junctions 1B and 2B. Therefore, when the grout 5 is injected into the water swollen grout jacket 40, As shown in FIGS. 3 and 4, the water swelling grout jacket 40 is swollen by the surrounding water (portion indicated by a thick diagonal line in the figure). In this case, the swollen water swollen grout jacket 40 increases in volume, flows into the slits 1C and 2C formed in the junctions 1B and 2B, and closes the slits 1C and 2C. In addition, the space at the bottom of the junctions 1B and 2B is completely blocked by the water swelling grout jacket 40 gradually swelling as shown in FIGS. 4 (a) and 4 (b). Thereby, the slits 1C and 2C can be completely stopped.

  In this embodiment, as the water swelling grout jacket 40, the one having a slow swelling start time at which swelling starts after the grout 5 is cured is used. Further, since the water swollen grout jacket 40 swells in accordance with the surrounding water condition, the swelling ratio and speed of the water swollen grout jacket 40 are determined by conditions such as the soil quality, water level, and pressure condition at the site. Is done.

  Further, even if a gap is formed between the inner surface of the junctions 1B and 2B and the water-swelled grout jacket 40 due to the grouting agent breathing and the water swelling and wrinkle of the water-swelled grout jacket 40, the water-swelled grout jacket after the grout 5 is cured. Since 40 swells, the said clearance gap can be covered by the increase in the volume by the swelling. As a result, it is possible to more effectively stop the slits 1C and 2C.

  7 and 8 show a modification of the present embodiment. As shown in FIG. 7, when the space between the steel pipe sheet piles 1A and 2B is opened more than the design value, the central space between the junctions 1B and 2B becomes relatively narrow, so that the water swelling grout jacket 40 Nadaburi and wrinkles are likely to occur.

  In this modified example, as shown in FIG. 8, since the water swelling grout jacket 40 is swollen by the surrounding water, the space swollen by joining the junctions 1B and 2B is closed, and the swollen water swelling grout jacket 40 is further provided. The slits 1C and 2C are closed. Thereby, a sufficient water stop effect can be obtained.

  Next, a second embodiment of the present invention will be described. In this embodiment, as shown in FIG. 9, a plurality of corrugated concrete sheet piles 50 are an example in which both ends thereof are joined to each other.

  As shown in the drawing, the concrete sheet pile 50 has a convex portion 51 bent in a convex shape at the center portion, and a semicylindrical concave portion 54 is formed on the end surfaces 53 of both side portions 52.

  In addition, a joint fitting 55 is fixed to one side part (left side in the figure) of the both side parts 52 by a bolt 56, and an engagement groove 57 is formed on the other side part (right side in the figure). The joint hardware 55 has a protrusion 55A at the end, and the protrusion 55A engages with the engagement groove 57 when the two concrete sheet piles 50 are joined.

  When the two concrete sheet piles 50 are joined, that is, when the end faces 53 on the side portions 52 of the two concrete sheet piles 50 are joined together, a circular vertical hole 58 is formed by the semicylindrical concave portion 54. The

  In the present embodiment, as shown in FIG. 10, the water swelling grout jacket 40 is inserted into the vertical hole 58 and the water swelling grout jacket 40 is filled with the grout 5.

  According to the above configuration, since the water swelling grout jacket 40 is inserted into the vertical hole 58, when the grout 5 is injected into the water swelling grout jacket 40, as shown in FIG. Is swollen by the surrounding water (the portion indicated by the thick diagonal line in the figure). In this case, the swollen water swollen grout jacket 40 increases in volume and flows into the gap between the side end faces 53, 53 of the concrete sheet pile 50. As a result, the inside of the vertical hole 58 and the side end surfaces 53, 53 of the concrete sheet pile 50 can be closed, and sufficient water stopping can be performed.

  In Example 1 and Example 2 described above, the material of the water swelling grout jacket 40 is selected from urethane, sponge, nonwoven fabric, and the like depending on the use conditions. Urethane-based, sponge-based, and non-woven fabric-based materials have excellent characteristics for swelling and obtaining a sufficient water-stopping effect.

  Moreover, in Example 1 and Example 2, about the dilution with the ground water of the grout 5, it can respond by making the raw material of the water swelling grout jacket 40 water-permeable thing, such as a urethane type.

It is a horizontal sectional view of the steel pipe sheet pile joint part by Example 1. It is sectional drawing along the AA line of FIG. In FIG. 1, it is a horizontal sectional view of the steel pipe sheet pile joint part which shows a mode when the water swelling grout jacket swells. FIG. 4 shows a cross-section along the line BB in FIG. 3, (a) shows a state where the water-swelled grout jacket is swollen, and (b) shows a state where the water-swelled grout jacket is completely swollen. is there. It is a figure which shows an example for inserting a water swelling grout jacket in the space between junctions. It is a figure which shows the other example for inserting a water swelling grout jacket in the space between junctions. It is a horizontal sectional view of the steel pipe sheet pile joint part by the modification of Example 1. In FIG. 7, it is a horizontal sectional view of the steel pipe sheet pile joint part showing a state when the water swelling grout jacket is swollen. It is a top view when the some concrete sheet pile by Example 2 is connected. It is an enlarged view of the joint part of a concrete sheet pile. In FIG. 10, it is a figure which shows a mode when the water swelling grout jacket swells. It is a perspective view which shows a mode when several steel pipe sheet piles are driven.

Explanation of symbols

1A, 2A Steel pipe sheet pile 1B, 2B Junction 1C, 2C Slit 5 Grout 40 Water swelling grout jacket 41 Weight 50 Concrete sheet pile 54 Recess 58 Vertical hole

Claims (4)

  A joint portion is provided on a plurality of sheet piles, and a water-swelled grout jacket is inserted into a space formed between the joint portion and the joint portion when the joint portions are joined to each other. A joint water-stopping structure, wherein the water-stopping grout jacket is filled with grout and the water-swelling grout jacket swells to stop water. When the sheet pile is a steel pipe sheet pile, the joint portion is a cylindrical junction provided along the vertical direction on the outer peripheral surface of the steel pipe sheet pile, and the junction is formed with a slit along the axial direction. ,
The joint water stop structure according to claim 1, wherein a junction-side junction is fitted into the slit, and the junction is joined to each other to form the space between the junctions. . When the sheet pile is a concrete sheet pile, the joint portion is formed on both sides of the concrete sheet pile, and a recess is formed on the end surface of the both sides,
The joint part water stop structure according to claim 1, wherein the space is formed by the concave portion and the concave portion of the end surface on the mating counterpart side by joining the end surfaces of the both side portions. When joint portions provided on a plurality of sheet piles are joined together, a water-swelled grout jacket is inserted into a space formed between the joint portion and the joint portion, and the grout is further placed in the water-swelled grout jacket. Filling and swelling the water-swelled grout jacket to stop the joint between the joints, thereby stopping the joint.

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