JP2003321836A - Jet structure of concrete sheet pile and its jet nozzle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a jet structure of a concrete sheet pile and its jet nozzles preventing the jet nozzles from being choked up even if water jetting is completely stopped during the execution. <P>SOLUTION: The jet structure of a concrete sheet pile comprises a plurality of pressure pipes 2 supplying the water jetting to the lower end of the concrete sheet pile 1 and the jet nozzles 3 jetting the water jetting below the concrete sheet pile 1 connected to the pressure pipes 2. The jet nozzles 3 comprise a check valve 4 of an elastic material for allowing the jet of the water jetting supplied from the pressure pipes 2 and protective sleeves 5 surrounding the circumference of the check valve 4. Recess sections 6 putting the check valve 4 and the protective sleeves 5 into them are formed in the lower end face of the concrete sheet pile 1. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete sheet pile widely used for revetments, earthen walls, etc., and a jetting structure for the concrete sheet pile having a jet nozzle for jetting high-pressure water at its lower end, and its jetting. Regarding nozzles.

[0002]

2. Description of the Related Art Conventionally, there are several types of concrete sheet piles. For example, a type called a flat shape, a groove shape, a corrugated shape, or the like is well known due to its sectional shape. Concrete sheet piles are used for rivers, revetments on the shores, reservoir walls,
It is widely used in various construction works as a building material for building Tsukishima and water-stop walls.

In order to drive the concrete sheet pile 1 as described above into the ground G, as shown in FIG. 9 as an example of a general construction situation (JVI construction method), first, a frame F for positioning the concrete sheet pile 1 is constructed. Launch on site. on the other hand,
By attaching a vibro hammer H to the upper end of the concrete sheet pile 1 and suspending the vibro hammer H with a crane or the like, the concrete sheet pile 1 is placed in an upright posture.

In this state, the concrete sheet pile 1 is framed F
1) and drop the bottom of the concrete sheet pile 1 into
Push the ground G shown in 0. Further, when ultrasonic vibration is applied to the concrete sheet pile 1 by the vibro hammer H, the concrete sheet pile 1 gradually sinks into the ground G.

In this process, the injection nozzle N having a diameter of 3 to 6 mm provided at the lower end of the concrete sheet pile 1 as shown in FIG.
The ground G immediately below the concrete sheet pile 1 is cut by injecting high-pressure water J pressurized to about 150 kg / cm ² . At the same time, the muddy water shaving by the high-pressure water J and blowing from the ground G intervenes between the concrete sheet pile 1 and the ground G, so that it also serves as a lubricant for reducing the friction between them.

The above procedure is repeated to successively construct a plurality of concrete sheet piles. However, if one concrete sheet pile 1 is driven immediately after another concrete sheet pile 1 adjacent thereto is continuously driven, the concrete sheet pile 1 is The ground G around is loosened and the concrete sheet pile 1 becomes unstable. For this purpose, the joint surface 10 between the concrete sheet piles 1
The problem arises that there is a gap between. This tendency becomes more remarkable when the ground G is soft.

As a countermeasure against the above, first, a plurality of concrete sheet piles 1 are driven into the ground G in about 1/3 to 1/2 of the longitudinal dimension thereof, and the concrete sheet pile 1 is driven for one day or more. Suspend. After that, as shown in FIG. 10A, half of the plurality of concrete sheet piles 1 are individually separated and driven into a desired depth. Finally, as shown in FIG. 3B, all the concrete sheet piles 1 are driven to a desired depth. As a result, the ground G does not loosen significantly,
Since each concrete sheet pile 1 is stable, no gap is formed between the joint surfaces 10 of the concrete sheet piles 1.

Further, in order to carry the concrete sheet pile 1 to the construction site, the concrete sheet pile 1 is loaded on a trailer and transported by land, so that the total weight and the total length of the concrete sheet pile 1 are variously restricted. For example, on a general road, it is legally regulated that the total length of the concrete sheet pile 1 that can be mounted on the vehicle must be 21 m or less. There is a need to. This connection work is
Drive the first concrete sheet pile 1 into the ground G,
The operation of driving the concrete sheet pile 1 is temporarily stopped. Then, the lower end of the other concrete sheet pile 1 is electrically welded to the upper end of the one concrete sheet pile 1.

[0009]

However, even when the operation of driving the concrete sheet pile 1 is interrupted as described above, the injection of the high-pressure water J from the injection nozzle N cannot be completely stopped, and the high-pressure water is wasted. The jet of water J must be continued. Conventionally, the pressure of the injection of the high-pressure water J is reduced to about 4 to 9 kg / cm ² so that the energy such as the electric power supplied to the pressurizing pump that generates the high-pressure water J can be saved a little. The injection continues even during the interruption.

This is for the following reason. That is, if the injection of the high-pressure water J is completely stopped, since the lower end of the concrete sheet pile 1 is deeply immersed in the water, muddy water will be pushed into the injection nozzle N by a relatively strong water pressure. Therefore, when the injection nozzle N is clogged with sand or small stones which are solids of muddy water, and when the driving operation is restarted, the problem that the high pressure water J cannot be injected occurs.

Therefore, an object of the present invention is to provide a concrete sheet pile jetting structure and its jetting nozzle, in which the jetting nozzle is not clogged even if the jetting of high-pressure water is completely stopped during construction.

[0012]

A jetting structure for a concrete sheet pile according to the present invention is a structure for jetting high-pressure water from a jet nozzle provided at a lower end of a concrete sheet pile, and the jet nozzle has a high pressure at a lower end of the concrete sheet pile. It is provided with a pressure pipe for supplying water and a check valve made of an elastic material which is connected to the pressure pipe and ejects high-pressure water below the concrete sheet pile.

Furthermore, the concrete sheet pile injection structure according to the present invention comprises a protective sleeve surrounding the check valve.

Further, in the concrete sheet pile jetting structure according to the present invention, a recess for accommodating the check valve and the protective sleeve is formed in the lower end surface of the concrete sheet pile.

The jet nozzle according to the present invention comprises a check valve made of an elastic material for jetting high pressure water, and a protective sleeve surrounding the check valve.

Further, in the injection nozzle according to the present invention, the opposing edge portion of the one-end opening of the check valve is in close contact with the other, and the opposing edge portion is opened by the pressure of the high-pressure water introduced from the other end opening of the check valve. Is.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION An injection structure and an injection nozzle for a concrete sheet pile according to an embodiment of the present invention will be described with reference to the drawings. In the following description, the same components as those of the conventional technique will be designated by the same reference numerals and the description thereof will be omitted.

As shown in FIGS. 1 to 3, the jet structure for concrete sheet pile according to the present embodiment has four pressure pipes 2 for supplying high-pressure water to the lower end of the concrete sheet pile 1, and these pressure pipes 2. Is connected to the concrete sheet pile 1 and ejects high-pressure water below the concrete sheet pile 1. As shown in detail in FIG. 4, each injection nozzle 3 includes a check valve 4 made of an elastic material that allows ejection of high-pressure water supplied from the pressure pipe 2, and a protective sleeve 5 surrounding the check valve 4. Composed of and.

As shown in FIGS. 1 to 4, a concrete sheet pile 1 is formed in a cross-sectional shape that is substantially hat-shaped or bent in a wave shape, and four injection nozzles 3 are arranged on the lower end surface thereof. Further, four recesses 6 are formed on the lower end surface of the concrete sheet pile 1, and the entire injection nozzle 3, that is, the check valve 4 and the protective sleeve 5 are respectively recessed in each recess 6. The shape of the concave portion 6 is not limited to the round hole shape shown in the drawing, but may be a square shape, a concave line, or a groove shape. Alternatively, the injection nozzle 3 may be projected from the lower end surface of the concrete sheet pile 1 without forming the recess 6.

A route through which high-pressure water is supplied to the four pressure pipes 2 will be described. That is, the fiber reinforced hose 20 connected to a pressure pump (not shown) that generates high-pressure water extends along the side surface of the concrete sheet pile 1. The attachment fitting 21 attached to the lower end of the fiber reinforced hose 20
It is connected to a manifold 24 embedded in the concrete sheet pile 1 via a hose union 22 and an exterior elbow joint 23.

The manifold 24 includes a pair of elbow joints 2
Two concrete pressure pipes 2 are connected to two pressure pipes 2 for guiding high-pressure water to both sides of the lower end surface of the concrete sheet pile 1. Furthermore, the manifold 24 is connected via a bifurcated joint 25 to two pressure pipes 2 that guide high-pressure water to the vicinity of the center of the lower end surface of the concrete sheet pile 1. The numbers of the injection nozzles 3 and the pressure pipes 2 described above are not limited to four, and can be appropriately increased or decreased according to the pressure of the high-pressure water and the range of ejection.

The fiber reinforced hose 20 can withstand tensions in excess of 1 ton. When a tension smaller than this is applied to the fiber reinforced hose 20 by using a take-up drum (not shown) with a prime mover, the fitting between the two is adjusted so that the attachment fitting 21 is disengaged from the hose union 22. ing. This is because the fiber reinforced hose 20 is recovered when the work of driving the concrete sheet pile 1 into the ground G is completed.

As shown in FIGS. 4 and 5, the pressure pipe 2
The check valve 4 and the protective sleeve 5 are connected to each other via the first and second screw joints 7 and 8 and the joint pipe 9. The first screw joint 7 has a tip end of the pressure pipe 2 fitted into one end opening thereof, and a male screw 70 is formed on the outer peripheral surface of the other end thereof. The second screw joint 8 has a male screw 80 formed on the outer peripheral surface of one end embedded in the concrete sheet pile 1 and a male screw 81 formed on the outer peripheral surface of the other end protruding outside the concrete sheet pile 1 (in the recess 6). The union portion 82, which is formed and further extends from the other end, is fitted into the other end opening 41 of the check valve 4. First,
The second screw joints 7 and 8 have respective male screws 70 and 80.
Are connected by a joint pipe 9 having an inner peripheral surface formed with a female screw 90 for fastening.

The check valve 4 is a pipe material mainly made of an elastic material such as highly elastic vinyl chloride, synthetic rubber or silicon. As shown in FIGS. 6A and 6B, the one-end opening 4 of the check valve 4
0 is closed when the opposite edges 10 thereof are in close contact with each other, and due to the pressure of the high pressure water introduced from the other end opening 41,
As shown in FIG. 7C, the facing edge portion 10 is elastically opened. As shown in FIG. 5, the check valve 4 has an outer shape in which the collar portion 42 is gradually narrowed toward one end and the collar portion 42 is projected around the other end. The facing edge portion 10 is formed by causing the facing portions of the edge portion of the one-end opening 40 to approach each other inward and abut against each other.

As shown in FIG. 4, the collar portion 42 of the check valve 4 is sandwiched between the one end surface of the second screw joint 8 and the protective sleeve 5. The female screw 50 formed on the inner peripheral surface of the one end opening of the protective sleeve 5 has the male screw 8 of the second screw joint 8.
It is concluded to 1. The high-pressure water ejected from the one end opening 40 of the check valve 4 passes through the other end opening 51 of the protective sleeve 5,
It is ejected below the concrete sheet pile 1. Here, the description "downward" is based on the premise that the concrete sheet pile 1 is installed upright and is not intended to limit the direction or posture of the concrete sheet pile 1.

The protective sleeve 5 plays a role of a nut for fixing the check valve 4 to the second screw joint 8, and sand or dust scattered by the high pressure water when the check valve 4 is installed (JVI method). It is a metal tube with a thick wall for preventing pebbles from colliding with the check valve 4 and for directly preventing the check valve 4 from being pressed against the ground G. Further, by disposing the protective sleeve 5 in the recess 6, the length of the protective sleeve 5 protruding from the lower end surface of the concrete sheet pile 1 is made as short as possible. Alternatively, the entire protective sleeve 5 may be immersed in the recess 6. As a result, it is possible to prevent the protective sleeve 5 from directly colliding with the ground G and prevent the protective sleeve 5 from being damaged during transportation of the concrete sheet pile 1.

The check valve 4 is not limited to the form in which the opposite edges 10 are arranged in one character as shown in FIG. 6, but for example, as shown in FIG. 7, two pairs of opposite edges arranged at right angles are provided. By forming 10, the one end opening 40 may be closed in a cross shape.

Further, as shown in FIG. 8, the protective sleeve 5
May be omitted, and the recess 6 may be allowed to play this role. In this case, the check valve 4 is fixed by fastening the penetrating nut 11 to the male screw 81 of the second screw joint 8. Further, a base 12 may be added to the rim of the recess 6 to reinforce the periphery of the recess 6, or in order to make it difficult for sand or pebbles scattered by high-pressure water to enter the recess 6, The diameter of the concave portion 6 may be defined to be small by 12.

The injection structure and injection nozzle for concrete sheet pile according to the present embodiment exemplified above should not be understood to substantially limit the technical idea of the present invention.
The present invention is carried out while making appropriate improvements, changes or additions within the scope of the gist thereof by the creativity and ingenuity of those skilled in the art.

[0030]

According to the injection structure of concrete sheet pile according to the present invention, the check valve made of an elastic material for ejecting high pressure water below the concrete sheet pile is connected to the pressure pipe for supplying high pressure water. Even if the injection of high-pressure water from the injection nozzle is completely stopped, the check valve can prevent the muddy water from being pushed into the injection nozzle.

Therefore, when the operation of driving the concrete sheet pile is interrupted, it is not necessary to continue the injection of high-pressure water so that the injection nozzle is not clogged with sand or pebbles, so that pressurization for generating high-pressure water is required. The energy supplied to the pump can be saved. Moreover, the noise and vibration associated with the injection of high-pressure water can be completely stopped.

Further, according to the injection structure of the concrete sheet pile according to the present invention, since the circumference of the check valve is surrounded by the protective sleeve, the check valve receives the reaction from the ground in the process of driving the concrete sheet pile into the ground. It will not be damaged by colliding with small stones scattered by force or high pressure water.

Further, according to the concrete sheet pile injection structure of the present invention, since the check valve and the protective sleeve are recessed in the lower end surface of the concrete sheet pile,
The check valve and protective sleeve are not directly subjected to the load of the concrete sheet pile. Therefore, the check valve and the protective sleeve are not strongly pressed against the ground and damaged.

According to the injection nozzle of the present invention, since the check valve made of the elastic material for ejecting the high pressure water supplied from the pressure pipe prevents the reverse flow of the muddy water or the like, the injection nozzle is provided with the high pressure water. Even if it is not constantly supplied, it will not be clogged with sand or pebbles.

Further, since the check valve is in close contact with the opposite edge of the other end opening of the elastic tube for introducing the high pressure water from the one end opening, the opposite edge is opened by the pressure of the high pressure water and the high pressure water is discharged. Erupted. In other cases, that is, when high-pressure water is not supplied, the other end opening is closed, and it is possible to reliably prevent backflow of muddy water or the like.
With such an extremely simple structure and principle, it is possible to perform an appropriate opening / closing operation, so that there is almost no failure, and there is an advantage that it can be manufactured at an extremely low cost.

[Brief description of drawings]

FIG. 1 is a front view showing a concrete sheet pile injection structure according to an embodiment of the present invention.

FIG. 2 is a side view showing the injection structure of the concrete sheet pile according to the embodiment of the present invention.

FIG. 3 is an end view showing a concrete sheet pile injection structure according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view showing the main parts of the concrete sheet pile injection structure according to the embodiment of the present invention.

FIG. 5 is an exploded perspective view of the injection nozzle according to the embodiment of the present invention.

FIG. 6 is a cutaway perspective view of the injection nozzle according to the embodiment of the present invention and a perspective view showing the operation thereof.

FIG. 7 is a perspective view of a modified example of the check valve applied to the injection nozzle according to the embodiment of the present invention.

FIG. 8 is a cross-sectional view showing the main parts of a modified example of the injection structure for the concrete sheet pile according to the embodiment of the present invention.

FIG. 9 is an explanatory view of a procedure for constructing a conventional concrete sheet pile.

FIG. 10 is a bird's-eye view of a conventional concrete sheet pile construction site.

[Explanation of symbols]

1: Concrete sheet pile 2: Pressure piping 3: Injection nozzle 4: Check valve 5: Protective sleeve 6: recess 10: Opposite edge

Claims (5)

[Claims] 1. A jet structure for a concrete sheet pile that jets high-pressure water from a jet nozzle provided at the lower end of the concrete sheet pile, wherein the jet nozzle supplies pressure water to the lower end of the concrete sheet pile, and An injection structure for a concrete sheet pile, comprising: a check valve made of an elastic material, which is connected to a pressure pipe and ejects the high-pressure water below the concrete sheet pile. 2. The injection structure for a concrete sheet pile according to claim 1, further comprising a protective sleeve surrounding the check valve. 3. The injection structure for a concrete sheet pile according to claim 2, wherein a recess into which the check valve and the protective sleeve are inserted is formed on a lower end surface of the concrete sheet pile. 4. An injection nozzle comprising a check valve made of an elastic material for ejecting high pressure water, and a protective sleeve surrounding the check valve. 5. The opposite edge portion of the one-end opening of the check valve is in close contact, and the opposite edge portion is opened by the pressure of the high-pressure water introduced from the other end opening of the check valve. Injection nozzle.