JP2007177545A - Narrow place excavation/soil-removing apparatus, narrow place excavation/soil-removing construction method, and excavation/soil-removing system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To excavate and remove earth and sand in a narrow place without damaging a nozzle, using a miniaturized apparatus equipped with a gas-mixing jet pump and a water jet. <P>SOLUTION: According to a narrow place excavation/soil-removing apparatus to be provided, a double-pipe 1 is disposed at least on the front end of a suction pipe that is connected to the suction side of the gas-mixing jet pump 3 via a hose 2 and that sucks up soil excavated in a narrow place. The double-pipe 1 consists of an inner pipe and an outer pipe, one of which functions as a suction pipe 11 and the other of which functions as a jet supply pipe 12 that is connected to a high-pressure jet pump 5 via a hose 7 and that is supplied with high-pressure water from the high-pressure jet pump 5. The jet supply pipe 12 is provided with a plurality of nozzles 13 on the front end of the jet supply pipe 12, which nozzles 13 jet high-pressure jet water to an excavation part of the narrow place. A hose 6 is connected to the suction side of the gas-mixing jet pump 3, which hose 6 supplies high-pressure jet water from the high-pressure jet pump 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a drilling and earthing device for a narrow spot, a drilling and earthing method for a narrow spot using the apparatus, and a drilling and earthing system for a narrow spot including the drilling and earthing device.

  Conventionally, when drilling in narrow places where buckets etc. of dedicated excavators do not enter, it is conventionally excavated by grabbing earth and sand using a double scoop or by using a scoop or rod-shaped member and then sucking it with a vacuum pump. The earth was being dumped. However, in the case of hard earth and sand containing highly viscous earth and sand and gravel, the excavation and drainage by human power has been reduced in construction efficiency and cannot be excavated to a depth that cannot be reached by humans.

Patent Document 1 discloses an in-pipe excavating apparatus for excavating and discharging sediment deposited in a pipe in the middle of laying a steel pipe such as an oil pipeline, a fume pipe, etc. Are known. This in-pipe excavator is provided with a water jet for scouring the sediment accumulated in the pipe in the vicinity of the suction port of the air-jet jet pump inserted into the pipe. A large number of rod-like nozzles and movement assisting means are provided on the outer periphery of the tip.
Japanese Patent Laid-Open No. 11-59898

  By the way, in the excavation of a narrow portion, for example, when the excavator of Patent Document 1 is downsized and diverted and considered to be used after removing the movement auxiliary means on the outer periphery of the tip of the suction tube, the tip of the suction tube There is a possibility that the outer rod-shaped nozzle may be damaged by hard earth and sand containing highly viscous earth and sand.

  An object of the present invention is to efficiently excavate and remove earth and sand without damaging a nozzle by a downsized apparatus using an air-mixing jet pump and a water jet in a narrow space.

In order to solve the above-described problems, the invention according to claim 1 is an excavated soil that is connected to the suction side of the mixed-air jet pump 3 via a hose 2 and excavated in a narrow area, for example, as shown in FIG. The double pipe 1 is provided at least at the tip of the suction pipe for sucking the suction pipe, one of the inner pipe and the outer pipe forming the double pipe 1 is used as the suction pipe 11, and the other from the high-pressure jet pump 5 to the hose 7. And a jet supply pipe 12 to which high-pressure jet water is supplied, and a plurality of nozzles 13 for ejecting high-pressure jet water to the excavation part at the narrow part are provided at the tip of the jet supply pipe 12. Features a site excavation and earth removal device.
Here, as the double pipe portion, a structure in which a part of the inner pipe and the outer pipe are in contact, a structure in which the inner pipe is partially inscribed in the outer pipe, or a structure in which a part of the inner pipe and the outer pipe are integrated. Is also included.

According to the first aspect of the present invention, the suction pipe 11 connected to the suction side of the mixed-air jet pump 3 via the hose 2 and the jet supply pipe 12 connected to the high-pressure jet pump 5 via the hose 7. Is an integrated structure of the double pipe part 1 by the inner pipe and the outer pipe, and since there is no external member, the excavation and earthing device can be miniaturized according to the narrow part.
Accordingly, in a narrow space, the excavated soil is hose from the suction pipe 11 of the double pipe portion 1 while excavating the high pressure jet water from a plurality of nozzles 13 provided in the jet supply pipe 12 of the double pipe portion 1. 2 can be discharged by the mixed-air jet pump 3.
In addition, since the nozzle 13 is provided at the tip of the jet supply pipe 12, there is a concern that the nozzle 13 may be damaged by hard earth and sand containing highly viscous sand and gravel as in the case of a rod-like nozzle provided at the outer periphery of the tip of the suction pipe. There is no.

  The invention according to claim 2 is the excavation and earth discharging device for narrow space according to claim 1, wherein, for example, as shown in FIG. A hose 6 for supplying high-pressure jet water from 5 is connected.

  According to the second aspect of the present invention, the hose 6 for supplying high-pressure jet water from the high-pressure jet pump 5 is connected to the suction side of the mixed-air jet pump 3, so that the high-pressure jet pump for the mixed-air jet pump 3 is connected. The high pressure jet pump 5 can be shared for excavation and suction.

  A third aspect of the present invention is the narrow excavation and earth excavation apparatus for a narrow portion according to the first or second aspect, wherein, for example, as shown in FIGS. 1, 3, and 5, a part of the suction pipe 11 is provided. And attachments 14 and 15 connected to mobile machines E and F such as a backhoe and a crane.

  According to the third aspect of the present invention, the attachments 14 and 15 provided in a part of the suction pipe 11 are connected to the mobile machines E and F such as a backhoe and a crane, and the excavation and excavation apparatus is moved and excavated in a narrow area. Earth removal work can be performed.

  Invention of Claim 4 is the excavation earth removal apparatus for narrow places as described in any one of Claim 1 to 3, Comprising: As shown, for example in FIG. 1, FIG. The rotary joint 26 which makes at least a front-end | tip part rotatable is provided.

  According to the fourth aspect of the present invention, at least the distal end portion of the suction pipe 11 is rotated by the rotary joint 26, so that the excavated soil is efficiently removed by the rotation of the high-pressure jet water ejected from the nozzle 13 of the double pipe portion 1. Can be stirred.

  A fifth aspect of the present invention is a narrow excavation and earthing device according to any one of the first to fourth aspects, for example, as shown in FIG. 1, up to the base end of the suction pipe 11. The double pipe portion 1 is formed over almost the entire length of the tube.

  A sixth aspect of the present invention is the narrow excavation and earthing device according to any one of the first to fifth aspects, wherein, for example, as shown in FIG. Both the tube 11 and the outer tube 12 have a substantially circular cross section.

A seventh aspect of the present invention is a narrow excavation and earthing device according to any one of the first to fifth aspects, wherein, for example, as shown in FIG. The tube 52 has a substantially circular cross section, and the outer tube 54 has an arbitrary cross section.
Here, examples of the arbitrary shape of the cross section include an elliptical shape, an elliptical shape, a perfect circular shape, and a rectangular shape.

  The invention according to claim 8 is the narrow excavation and earthing device for narrow places according to any one of claims 1 to 7, and for example, as shown in FIG. It is characterized by having.

The invention according to claim 9 is the excavation and earth discharging device for narrow places according to any one of claims 1 to 8, and for example, as shown in FIG. An oblique nozzle 47 is provided.
In addition to the fixed nozzle, the slant nozzle includes a movable nozzle such as a swing nozzle.

  According to the ninth aspect of the invention, the sand around the double pipe portion 1 can be excavated by the jetting of the high-pressure jet water toward the outside by the oblique nozzle 47.

  A tenth aspect of the present invention is a narrow excavation and earthing device according to any one of the second to ninth aspects, wherein, for example, as shown in FIG. Is provided with a control valve 10 that enables the switching operation of only one of the jet supply pipe 12 and the mixed-air jet pump 3 and the flow rate change and / or the pressure change of the supplied high-pressure jet water. It is characterized by.

  According to the invention described in claim 10, the control valve 10 allows high-pressure jet water to be supplied from one high-pressure jet pump 5 to both the jet supply pipe 12 of the double pipe portion 1 and the mixed air-jet pump 3 on the ground. The supply of high-pressure jet water can be variously controlled according to the situation, such as supply or switching to supply only one of them, changing the flow rate of high-pressure jet water to be supplied, or changing the pressure.

  The invention according to claim 11 is, for example, as shown in FIG. 1, using the excavation and earthing device for narrow places according to any one of claims 1 to 10, Excavation method for excavating and narrowing a narrow area by discharging high-pressure jet water from the nozzle 13 and excavating the excavated soil from the suction pipe 11. It is characterized by.

  According to the eleventh aspect of the present invention, the double pipe part 1 of the excavation and earthing device is applied to the excavation part in a narrow part, and high-pressure jet water is ejected from the nozzle 13 of the jet supply pipe 12 of the double pipe part 1. During excavation, the excavated soil can be discharged from the suction pipe 11 of the double pipe portion 1 through the hose 2 by the mixed air jet pump 3.

  The invention described in claim 12 is a method for excavating and discharging a narrow part according to claim 11, and for example, as shown in FIGS. 3 and 5, a part of the suction pipe 11 is connected to a backhoe, a crane, or the like. It is characterized in that excavation and soiling of narrow spaces is continuously performed while being held by the mobile devices E and F.

  According to the twelfth aspect of the present invention, by continuously holding a part of the suction pipe 11 to the mobile equipment E / F such as a backhoe or a crane, continuous excavation and soiling can be performed in a narrow area.

  A thirteenth aspect of the present invention is a narrow excavation and earthing method according to the eleventh or twelfth aspect of the present invention, for example, as shown in FIG. It is characterized by deep excavation and excavation by adding more.

  According to the thirteenth aspect of the present invention, the suction tube 11 is extended in the vertical direction, the lateral direction, etc. deeply by adding at least the suction tube 11 in, for example, a narrow portion where the height and depth are limited. Excavation can be done.

  The invention described in claim 14 is a method for excavating and discharging a narrow portion according to any one of claims 11 to 13, wherein, for example, as shown in FIGS. Excavation is performed while rotating the tip by the rotary joint 26.

  According to the fourteenth aspect of the present invention, at least the distal end portion of the suction pipe 11 is rotated by the rotary joint 26, so that the excavated soil is efficiently removed by the rotation of the high-pressure jet water ejected from the nozzle 13 of the double pipe portion 1. Can be stirred.

  The invention described in claim 15 is, for example, as shown in FIGS. 1, 3, and 5, the narrow portion excavation and earthing device according to any one of claims 1 to 10, and the suction pipe 11. A mobile E / F such as a backhoe or a crane holding a part thereof, an air-mixing jet pump 3 having a suction side connected to the suction pipe 11 via a hose 2, and the air-jet pump 3 and the jet supply pipe 12 is connected to the discharge side of the mixed-air jet pump 3 via the hose 4 and is discharged from the mixed-air jet pump 3. It is characterized by a narrow excavation and soil removal system comprising a water / sediment separation facility 8 for separating muddy water into water and earth and sand.

According to the fifteenth aspect of the present invention, a part of the suction pipe 11 of the excavation and earthing device is connected to the mobile machines E and F such as a backhoe and a crane, so that the excavation and earthing device moves and excavates and discharges in a narrow area. Earth work can be done.
Then, in the narrow part, the double pipe part 1 is applied to the excavation part, and the excavated soil is excavated by ejecting high pressure jet water from the nozzle 13 of the jet supply pipe 12 of the double pipe part 1. It can be discharged from the single suction pipe 11 by the mixed air jet pump 3 through the hose 2.
Further, it is not necessary to separately provide a high-pressure jet pump for the mixed-air jet pump 3, and a single high-pressure jet pump 5 can be shared for excavation and suction.
Further, on the ground, the muddy water discharged from the air-mixing jet pump 3 can be separated into water and earth and sand by the water and earth and sand separation facility 8.

  The invention described in claim 16 is a narrow excavation and soil removal system according to claim 15, wherein, for example, as shown in FIG. The part is supplied to the high-pressure jet pump 5 (see the hose 9) and reused as high-pressure jet water.

  According to the sixteenth aspect of the present invention, a part of the water separated from the sediment by the water / sediment separation facility 8 is supplied to the high pressure jet pump 5 so that it can be reused as the high pressure jet water.

  According to the present invention, since there is no external member with an integrated structure in which the suction pipe and the jet supply pipe are a double pipe portion, the excavation and earthing device can be miniaturized, and the jet of the double pipe portion can be used in a narrow space. While excavating by jetting high-pressure jet water from a plurality of nozzles provided in the supply pipe, the excavated soil can be discharged from the suction pipe of the double pipe portion by a mixed jet pump through a hose. In addition, since the nozzle is provided at the tip of the jet supply pipe, there is no risk of breakage due to hard clay or sand containing highly viscous earth or gravel, as in the case of a rod-like nozzle provided at the outer periphery of the tip of the suction pipe. Benefits are gained.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.
[First Embodiment]
FIG. 1 is a conceptual diagram showing a system configuration of a first embodiment to which the present invention is applied. In FIG. 1, A and B are wall-like structures, C is a narrow portion, D is a dedicated excavator arm, and 1 is two Heavy pipe part, 2 is a suction hose, 3 is an air-jet jet pump, 4 is a discharge hose, 5 is a high-pressure jet pump, 6 is a suction-side jet high-pressure hose, 7 is a stirring-side jet high-pressure hose, 8 is water / sediment separation equipment , 9 is a water supply hose, and 10 is a control valve.

A narrow portion C between A and B such as a wall-like structure has a width of about 200 to 500 mm.
The double pipe part 1 is comprised by the inner pipe and outer pipe | tube by a steel pipe, and is provided in the excavation earth removal apparatus for narrow places excavated and discharged in the narrow place C about 200-500 mm wide. . In the example of illustration, the double pipe part 1 consists of the suction pipe | tube 11 by an inner pipe | tube, and the jet supply pipe | tube 12 by an outer pipe | tube, the nozzle 13 is provided in the lower end part (tip part) of the jet supply pipe | tube 12, and an upper part ( An attachment 14 is provided at the base). An excavator arm D is connected to the attachment 14. The excavation machine arm D is provided in a backhoe E (see FIG. 3), which is a mobile machine, for example.

In the double pipe portion 1, a suction hose 2 is connected to the upper end portion (base end portion) of the suction tube 11, and this suction hose 2 is connected to the suction side of the grounded mixed air jet pump 3. A discharge hose 4 is connected to the discharge side of the mixed air jet pump 3.
The high-pressure jet pump 5 supplies high-pressure jet water and is placed on the ground, and includes a suction-side jet high-pressure hose 6 and a stirring-side jet high-pressure hose 7. The suction-side jet high-pressure hose 6 is connected to the suction side of the mixed-air jet pump 3, and the stirring-side jet high-pressure hose 7 is connected to the upper end (base end) of the jet supply pipe 12.

The discharge hose 4 from the mixed air jet pump 3 is led to a water / sediment separation facility 8. The water / sediment separation facility 8 includes a water supply hose 9 for reusing part of the water separated from the sediment. The water supply hose 9 is connected to the high-pressure jet pump 5.
In the high-pressure jet pump 5, the suction-side jet high-pressure hose 6 and the agitation-side jet high-pressure hose 7 are led out via a control valve 10. In this control valve 10, high-pressure jet water is supplied from the high-pressure jet pump 5 to both the jet supply pipe 12 of the double pipe section 1 and the mixed gas jet pump 3 on the ground or only one of them is switched. Various control of the supply of high-pressure jet water according to the situation, such as changing the flow rate of the high-pressure jet water to be supplied or changing the pressure.

  FIG. 2 shows the cross section of the nozzle 13 portion of the double pipe portion 1 together with the action, and shows the injection direction of the high-pressure jet water when the nozzle 13 is an oblique nozzle facing outward, as indicated by an arrow. Moreover, the stirring efficiency of earth and sand is improved by rotating the double pipe part 1.

FIG. 3 shows an example of the use of the backhoe E as a mobile unit in an example of excavation and earthing work in a narrow space according to the present invention. As shown in the figure, the upper end (base) of the suction pipe 11 is connected to the arm D of the backhoe E. The attachment 14 provided in the elbow pipe 21 at the end) is connected, and the work of excavating and discharging the narrow portion C of the ground B along the pier A is shown.
In the illustrated example, the lower part (front part) of the suction pipe 11 is a double pipe part 1, and a jet supply pipe 12 and a nozzle 13 are provided in the double pipe part 1.

  FIG. 4 shows an attachment 14 as an example provided on the elbow tube 21 at the upper part (base part) of the suction pipe 11. As shown in the drawing, one left and right part on the elbow pipe 21 at the upper part (base part) of the suction pipe 11 are shown. A plate attachment 14 is attached.

FIG. 5 shows an example of use of the crane F as a mobile unit in an example of excavation and earthing work in a narrow space according to the present invention. As shown in the drawing, the wire H is lowered from the boom G of the crane (truck crane) F. The operation of digging and discharging the narrow part C of the ground B along the pier A by suspending the attachment 15 provided on the elbow pipe 21 at the upper part (base) of the suction pipe 11 is shown.
Also in the illustrated example, as in FIG. 3, the lower part (tip part) of the suction pipe 11 is the double pipe part 1, and the jet supply pipe 12 and the nozzle 13 are provided in the double pipe part 1.

  FIG. 6 shows an attachment 15 as an example provided in the elbow tube 21 at the upper part (base part) of the suction pipe 11. As shown in the drawing, the elbow pipe 21 at the upper part (base part) of the suction pipe 11 has an inverted U An attachment 15 using a character-shaped bar is attached.

FIG. 7 shows an example of the structure of the elbow tube 21 used for the base (upper part) of the double tube portion 1 of FIG. 1. For example, an elbow tube 21 having an outer diameter of about 140 mm is a holder tube 22 having a length of about 320 mm. The small-diameter portion 22a is connected and provided.
The holder tube 22 is obtained by integrating a small diameter portion 22a with a large diameter portion 22b having an outer diameter of about 280 mm, and a plurality of (three in the illustrated example) ball bearings 23 and seal rings 24 are provided in the large diameter portion 22b. The outer tube 25 is assembled rotatably. The holder pipe 22, the ball bearing 23, and the outer pipe 25 constitute a rotary joint 26.

The outer tube 25 has an outer diameter of about 200 mm, protrudes from the large-diameter portion 22 b of the holder tube 22 by a length of about 130 mm, and an inner tube 27 is inserted into the outer tube 25. The inner tube 27 has an outer diameter of about 130 mm and an inner diameter of about 105 mm, and is integrally provided with a spacer 28 for maintaining a distance from the outer tube 25. The inner tube 27 is coupled to the small diameter portion 22 a of the holder tube 22 via a seal ring 29.
A jet inlet 22 c that opens near the end of the inner tube 27 is formed in the large diameter portion 22 b of the holder tube 22. A pair of jet inlets 22 are formed to face the diameter direction of the holder tube 22.
Thus, in the elbow tube 21, the base portion (upper portion) of the double tube portion 1 is configured, and a jet flow path 17 continuous from the jet inlet 22 c is formed between the outer tube 25 and the inner tube 27.

FIG. 8 shows an example of the structure of the straight pipe 31 used for the intermediate part of the double pipe part 1 of FIG. 1, and the inner pipe 33 is inserted into the outer pipe 32 having an outer diameter of about 200 mm and a length of about 930 mm. Has been. The inner tube 33 has an outer diameter of about 130 mm and an inner diameter of about 105 mm, and is integrally provided with a spacer 34 for maintaining a distance from the outer tube 32.
A joint pipe 35 is connected to the outer pipe 32, and the joint pipe 35 protrudes from the outer pipe 32 by a length of about 150 mm.
In this way, an intermediate portion of the double tube portion 1 by the straight tube 31 is formed, and the jet flow path 18 is formed between the outer tube 32 and the inner tube 33.

FIG. 9 shows an example of the structure of the nozzle head pipe 41 used for the tip (lower part) of the double pipe part 1 of FIG. 1, and the inner part of the outer pipe 42 having an outer diameter of about 200 mm and a length of about 170 mm is shown. A tube 43 is inserted. That is, the short inner tube 43 is connected to the suction port 42 a having an inner diameter of about 125 mm of the outer tube 42.
The outer pipe 42 is formed with a short jet passage 19 surrounding the inner pipe 43, and a number of nozzle passages 44 that are continuous with the jet passage 19 and open to the end face. Nozzle 45 is mounted in this nozzle passage 44, and thus is a direct injection nozzle 45. In the illustrated example, 15 direct injection nozzles 45 are provided at equal intervals along the circumferential direction of the outer tube 42.
In this way, the tip part (lower part) of the double pipe part 1 by the nozzle head pipe 41 is constituted.

The above-mentioned elbow pipe 21, straight pipe 31, and nozzle head pipe 41 are connected to form the double pipe portion 1.
That is, the inner tube 27 of the elbow tube 21 is fitted and joined to the inner tube 33 of the straight tube 31, and the outer tube 25 of the elbow tube 21 is screwed and coupled to the outer tube 32 of the straight tube 31. Further, the inner tube 43 of the nozzle head tube 41 is fitted and joined to the inner tube 33 of the straight tube 31, and the outer tube 42 of the nozzle head tube 41 is screwed and coupled to the joint tube 35 of the straight tube 31. In addition, the straight pipe | tube 31 is added as needed.
Then, the stirring side jet high-pressure hose 7 is connected to the jet introduction port 22 c of the holder tube 22.

As shown in FIGS. 1, 3, and 5, the narrow portion excavation and earthing device having the above-described configuration includes an attachment provided on the elbow pipe 21 at the upper part (base part) of the double pipe part 1 or the suction pipe 11. 14 is connected to the arm D of the backhoe E, or the attachment 15 provided on the elbow pipe 21 is hung on the wire H lowered from the boom G of the crane (truck crane) F, so that the ground B along the pier A In a narrow portion C having a width of about 200 mm to 500 mm, etc., it is used for continuous excavation and earthing work accompanied by movement by a backhoe E or a crane (truck crane) F.
That is, by operating the high-pressure jet pump 5, high-pressure jet water is continuously supplied to the mixed-air jet pump 3 and the double pipe portion 1 through the control valve 10, the suction-side jet high-pressure hose 6, and the agitation-side jet high-pressure hose 7. If it supplies to, in the double pipe part 1, excavation and earthing of the narrow part C can be performed efficiently in a short time.

In other words, in the jet supply pipe 12 of the double pipe portion 1 in the state of standing at the narrow portion C, high-pressure jet water is filled from the jet introduction port 22c through the jet flow paths 17, 18, and 19, and the nozzle 13 (directly By discharging high pressure jet water from the injection nozzle 45), the earth and sand containing gravel at the narrow portion C is agitated and excavated.
Then, in the suction pipe 11 of the double pipe portion 1, the vacuum suction force generated by the mixed air jet pump 3 acts on the suction port 42 a, and excavated soil containing gravel is sucked up from the suction port 42 a and passes through the suction hose 2. Then, the air is sucked into the air-jet jet pump 3 and discharged to the water / sediment separation facility 8 through the discharge hose 4.
Therefore, safe and clean excavation and earthing work can be continuously performed in the narrow space C.
Moreover, if the double pipe portion 1 is rotated by the rotary joint 26, the excavated soil can be efficiently stirred by the rotation of the high-pressure jet water ejected from the nozzle 13 (direct injection nozzle 45) of the double pipe portion 1. Become.

Furthermore, it is possible to excavate deeply by adding straight pipes 31 as necessary.
On the ground, the muddy water discharged from the mixed-air jet pump 3 is separated into water and earth and sand by the water and earth and sand separation facility 8.
Moreover, a part of the separated water is supplied to the high-pressure jet pump 5 through a water supply hose 9 by the operation of a pump (not shown) and reused as high-pressure jet water.

In addition, the excavating and discharging device is connected to the suction pipe 11 connected to the suction side of the mixed jet pump 3 via the suction hose 2 and to the high-pressure jet pump 5 via the agitation-side jet high-pressure hose 7. The jet supply pipe 12 has an integrated structure of the double pipe portion 1 with an inner pipe and an outer pipe, and since there is no external member, the jet supply pipe 12 is reasonably downsized according to the narrowed portion.
Moreover, since the nozzle 13 (direct injection nozzle 45) is provided at the tip of the jet supply pipe 12 (nozzle head pipe 41), for example, a rod-like nozzle provided on the outer periphery of the tip of the suction pipe (see Patent Document 1). As in the case, there is an advantage that there is no fear of breakage due to hard earth and sand containing highly viscous earth and gravel.
Further, since the suction-side jet high-pressure hose 6 for supplying high-pressure jet water from the high-pressure jet pump 5 is connected to the suction side of the mixed-air jet pump 3, a high-pressure jet pump for the mixed-air jet pump 3 is provided separately. There is no need, and there is an advantage that one high-pressure jet pump 5 can be shared for excavation and suction.

Further, in the control valve 10, high-pressure jet water is supplied from one high-pressure jet pump 5 to both the jet supply pipe 12 of the double pipe section 1 and the mixed gas jet pump 3 on the ground, or only one of them. The supply of the high-pressure jet water is controlled in various ways depending on the situation, such as switching the flow rate, changing the flow rate of the supplied high-pressure jet water, or changing the pressure.
That is, in the case of soft earth and sand with low viscosity and water, high-pressure jet water is supplied from one high-pressure jet pump 5 and the mixed gas jet pump 3 on the ground of the double pipe portion 1 is controlled by switching the control valve 10. By supplying only to this, excavation and discharging of soft earth and sand having low viscosity and water can be performed only by the suction pipe 11 without jetting high-pressure jet water.
In addition, by controlling the switching of the control valve 10, it is possible to control the supply of high-pressure jet water appropriately according to the situation by changing the flow rate of the supplied high-pressure jet water or changing the pressure. is there.

In addition, after a predetermined narrow part excavation work, reinforcement, such as winding reinforced concrete, is performed along the pier A in a space surrounded by, for example, steel sheet piles.
In the above embodiment, excavation is performed downward, but excavation in the horizontal direction, oblique direction, or upward direction may be performed. Further, the extension pipe may be a flexible pipe or a rubber hose.
Moreover, although the above demonstrated the excavation before reinforcement of a bridge pier, it is needless to say that the excavation earth removal apparatus for narrow places of this invention is applicable also before excavation of a pile, or other uses.

[Second Embodiment]
FIG. 10 shows a second embodiment to which the present invention is applied, and shows a nozzle head pipe 41 at the tip (lower part) of the double pipe part 1, and basically an outer pipe 42 similar to FIG. The suction port 42a, the inner tube 43, and the jet channel 19 are formed.
A large number of nozzle passages 46 are formed in the outer tube 42 so as to be continuous with the jet flow path 19 and open obliquely downward. A nozzle 47 is attached to the nozzle passage 46, and therefore, it is an oblique nozzle 47. In the illustrated example, 15 oblique nozzles 47 are provided at equal intervals along the circumferential direction of the outer tube 42.

By such jetting of the high-pressure jet water toward the outside by the oblique nozzle 47, the earth and sand around the double pipe portion 1 is also excavated effectively.
Therefore, excavation efficiency can be further improved.

[Third Embodiment]
FIG. 11 shows a third embodiment to which the present invention is applied, and shows a nozzle head tube 51 as a double tube portion 1 provided at the tip (lower portion) of the suction tube 11, and has a length of about 100 mm inside diameter. A flange joint 53 is provided at the upper end of the inner pipe 52 of about 400 mm, and an outer pipe 54 is provided at the lower half of the inner pipe 52.
In the illustrated example, the outer tube 54 has an oval cross section, has a maximum inner diameter of about 220 mm, a minimum outer diameter of about 125 mm, and a length of about 200 mm. Is blocked. The stirring side jet high-pressure hose 7 is connected to the upper end of the outer tube 54 facing the major axis direction by a high-pressure nipple mounting screw 55. A central direct injection nozzle 56 and outward oblique nozzles 57 located on both sides along the short diameter direction are assembled to the lower end of the outer tube 54 facing the long diameter direction.

The above-described double pipe portion 1, that is, the nozzle head pipe 51 is provided by connecting the inner pipe 52 thereof to the tip portion (lower part) of the suction pipe 11 with a flange joint 53. Specifically, although not shown, a flange joint corresponding to the flange joint 53 is provided at the tip (lower part) of the suction pipe 11, and the flange joint 53 is bolted to the flange joint to thereby connect the nozzle head. A tube 51 is connected to the tip (lower part) of the suction tube 11.
In this way, the double pipe part 1 by the nozzle head pipe 51 is formed at the tip (lower part) of the suction pipe 11.
As described above, if the double pipe portion 1 having a long and narrow cross-sectional shape and including the direct injection nozzle 56 and the oblique nozzle 57 is used, in the excavation and earthing of the narrow portion C, the stirring efficiency and the earthing efficiency by the rotation are improved. It will be even better.

[Fourth Embodiment]
FIG. 12 shows a fourth embodiment to which the present invention is applied. A joint pipe 61 is screwed to the elbow pipe 21 at the base (upper part) of the suction pipe 11, and the joint pipe 61 is hollow. The rotary joint 62 is screwed and connected.
As described above, the elbow pipe 21 including the joint pipe 61 and the hollow rotary joint 62 may be configured in the upper part (base part) of the suction pipe 11.

In the above embodiment, the inner tube of the double tube portion is a suction tube and the outer tube is a jet supply tube. However, the present invention is not limited to this, and conversely, The inner tube may be a jet supply tube and the outer tube may be a suction tube.
In addition, the cross-sectional shape of the double pipe portion is not limited to a perfect circle shape or an oval shape, and may be any shape such as an elliptical shape or a square shape. Of course, the inclination angle, various dimensions of various members, specific detailed structures, and the like can be changed as appropriate.
Further, in the embodiment, the narrow spot excavation on the ground has been described, but narrow spot excavation in water can be performed in the same manner.

It is a conceptual diagram which shows the system configuration | structure of 1st Embodiment to which this invention is applied. It is the cross-sectional view which showed the nozzle part of the double pipe part of FIG. 1 with the effect | action. FIG. 7 is a schematic side view showing an example of using a backhoe as a mobile device, showing an example of excavation and earthing work in a narrow space according to the present invention. An example of the attachment with which the suction pipe of FIG. 3 is provided is shown, and is a side view (a) and a front view (b). FIG. 1 is a schematic side view showing an example of using a crane (truck crane) as a mobile device, showing an example of excavation and earthing work in a narrow space according to the present invention. An example of the attachment with which the suction pipe of FIG. 5 is provided is shown, and is a side view (a) and a front view (b). It is a vertical side view as an example which shows the base of the double pipe part of FIG. It is a vertical side view as an example which shows the intermediate part of the double pipe part of FIG. It is the vertical side view (a) and bottom view (b) as an example which shows the front part of the double pipe part of FIG. The 2nd Embodiment to which this invention is applied is shown, and it is the vertical side view (a) and bottom view (b) as an example which showed the front part of the double pipe part. The 3rd Embodiment to which this invention is applied is shown, and is the side view (a) as an example which showed the front-end | tip part of a suction tube, a longitudinal front view (b), and a bottom view (c). The 4th Embodiment to which this invention is applied is shown, and is the side view (a) and front view (b) as an example which showed the base part of the suction pipe, and the principal part fracture drawing (c) of the joint part. .

Explanation of symbols

A Wall-like structure, bridge pier, etc. B Wall-like structure, ground, etc. C Narrow part D Excavation machine arm E Backhoe (mobile machine; excavation machine)
F crane (mobile machine)
G Boom H Wire 1 Double pipe section 2 Suction hose 3 Mixed jet pump 4 Discharge hose 5 High pressure jet pump 6 Suction side jet high pressure hose 7 Stirring side jet high pressure hose 8 Water / sediment separation equipment 9 Water supply hose 10 Control valve 11 Suction Pipe 12 Jet supply pipe 13 Nozzle 14 Attachment 15 Attachment 17 Jet flow path 18 Jet flow path 19 Jet flow path 21 Elbow pipe 22 Holder pipe 22c Jet inlet 25 Outer pipe 26 Rotary joint 27 Inner pipe 31 Straight pipe 32 Outer pipe 33 Inside Pipe 34 Spacer 35 Joint pipe 41 Nozzle head pipe 42 Outer pipe 42a Suction port 43 Inner pipe 44 Nozzle passage 45 Direct injection nozzle 46 Nozzle passage 47 Oblique nozzle 51 Nozzle head pipe 52 Inner pipe 53 Flange joint 54 Outer pipe 55 For attaching a high pressure nipple Screw 56 Direct injection nozzle 57 Diagonal nozzle 61 Joint pipe 62 Hollow rotary joint

Claims (16)

Connected to the suction side of the mixed-air jet pump via a hose, and a double pipe part is provided at least at the tip of the suction pipe for sucking excavated soil excavated in a narrow area,
One of the inner pipe and the outer pipe forming the double pipe portion is a suction pipe and the other is connected through a hose from a high-pressure jet pump to be a jet supply pipe to which high-pressure jet water is supplied,
A narrow portion excavation and earthing device, wherein a plurality of nozzles for jetting high-pressure jet water to the excavation portion of the narrow portion are provided at the tip of the jet supply pipe.   2. The narrow part excavation and earthing device according to claim 1, wherein a hose for supplying high-pressure jet water from the high-pressure jet pump is connected to a suction side of the mixed-air jet pump.   3. The narrow excavation and earthing device according to claim 1, wherein an attachment connected to a mobile device such as a backhoe or a crane is provided in a part of the suction pipe.   The narrow pipe excavation and earthing device according to any one of claims 1 to 3, wherein the suction pipe includes a rotary joint that allows at least a distal end portion thereof to rotate.   The narrow pipe excavation and earthing device according to any one of claims 1 to 4, wherein the double pipe part is formed over substantially the entire length up to the base end part of the suction pipe.   The narrow pipe excavation and earthing device according to any one of claims 1 to 5, wherein the double pipe section has a substantially circular cross section in both the inner pipe and the outer pipe.   The narrow pipe excavation and earthing device according to any one of claims 1 to 5, wherein the double pipe portion has an inner pipe having a substantially circular cross section and an outer pipe having an arbitrary cross section. .   8. The narrow excavation and earthing device according to claim 1, wherein the nozzle includes a direct injection nozzle.   The narrow nozzle excavation and earthing device according to any one of claims 1 to 8, wherein the nozzle has an oblique nozzle directed outward.   It is possible to control the supply of high-pressure jet water from the high-pressure jet pump by switching only one of the jet supply pipe and the mixed-air jet pump, the flow rate change and / or the pressure change of the supplied high-pressure jet water. 10. A narrow portion excavation and earthing device according to any one of claims 2 to 9, further comprising a control valve. Using the excavation and earthing device for narrow part according to any one of claims 1 to 10,
Exposing the double pipe part to a narrow excavation part, ejecting high-pressure jet water from the nozzle and excavating, and discharging the excavated soil from the suction pipe, thereby discharging the excavated soil in the narrow part The excavation and excavation method for narrow spaces.   12. The narrow excavation and excavation method according to claim 11, wherein a part of the suction pipe is held by a mobile device such as a backhoe and a crane, and excavation and excavation of the constriction is continuously performed.   13. The narrow excavation and excavation method according to claim 11 or 12, characterized in that excavation and excavation is carried out deeply by adding at least the suction pipe in a place restricted by a work space.   The excavation and excavation method for narrow places according to any one of claims 11 to 13, wherein excavation is performed while rotating at least a tip of the suction pipe by the rotary joint. Excavation and earth removal device for narrow part according to any one of claims 1 to 10,
A mobile device such as a backhoe or crane that holds a part of the suction pipe;
An air-jet pump having a suction side connected to the suction pipe via a hose;
A high-pressure jet pump for supplying high-pressure jet water to the mixed-air jet pump and the jet supply pipe via hoses,
A water / sediment separation facility that is connected to the discharge side of the mixed-air jet pump via a hose and separates muddy water discharged from the mixed-air jet pump into water and earth and sand;
A narrow excavation and soil removal system characterized by comprising:   16. A narrow excavation and excavation system according to claim 15, wherein a part of the water separated from the sediment by the water / sediment separation facility is supplied to the high-pressure jet pump and reused as the high-pressure jet water. .

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