JPH10159171A - Method and device for dredging silted deposit in inverted siphon manhole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the dredging capacity by inserting a guide column into a man hole while forming the guide column by attaching column bodies, mounting a dredging equipment along the column in a vertically movable manner, moving the dredged sediment to the upper part of the column, and discharging it on the ground. SOLUTION: A plurality of unit columns are successively attached from an upper part of a lower guide column 1A, and integrated with each other, and lowered into a man hole P. When a lower end of a guide column 1 under assembly reaches in the vicinity of a bottom part, an upper guide column 1B having a back side column 28 is attached thereto. Then, the guide column 1 is hoisted from a guide frame 42 through a wire, a and a bucket part 2 is fitted to the upper guide column 1B. The bucket part 2 is lowered to a bottom part of the man hole P along the guide column 1, and the sediment Q is scooped and carried out on the round. An oscillating column of the lower guide column 1A is sprung up forward to expand the dredging range, and the bucket part 2 is lowered along a lower end column, and then, the sediment Q is dredged. The dredging capacity can be improved thereby.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the dredging of manholes in sewers, particularly sludge, earth and sand, etc., at the bottoms of manholes in so-called "overhangs" provided at locations where main sewers cross rivers. The present invention relates to a dredging method and a dredging device for sediment in a manhole on a shelter.

[0002]

2. Description of the Related Art FIG. 18 shows the structure of a general sewer underpass. Here, A is a river, B is an upstream sewer, C is an upstream shelter, D is a shelter, E is a downstream shelter, and F is a downstream sewer. A is a manhole cover for closing the opening of the human hole c, and E is a manhole cover. B is a work step portion (a scaffold for an operator) in the human hole c and the e. Thus, in the sewer sewage, sludge and earth and sand are deposited on manholes and the bottom of sewers over a long period of time (g, j, and r indicate the accumulated sludge and sediment). The cross section is reduced and the roughness is increased, which results in a situation where the flow of the sewer is obstructed. Conventionally, in order to dredge the earth and sand at the bottom of the manhole, a bypass is provided in the sewer near the shelter, and the sewer flow is shut off (that is, dried up). A method of removing the earth and sand in the human hole or a method of dredging the earth and sand at the bottom of the human hole by a diver without stopping the flow of sewerage is adopted. However, depending on the above-mentioned method, the work for interrupting the sewer flow near the overpass and providing the bypass is large-scale and time-consuming, and the construction cost is enormous. Depending on the method above,
Both are inefficient and dangerous because of the manual work of the diver.

[0003] For this reason, a dredging method using mechanical force using a grab bucket or the like is conceivable, but there are various problems depending on the general-purpose dredging method according to the peculiarity of the manhole. That is, the overpass has a large depth, and the opening is closed by a small-diameter manhole cover (which is opened and closed by human power so that it can be made as small as possible). There are special features such as heavy gravel and a solidified sediment layer deposited at the bottom of the human hole. For this reason, depending on the normal dredging method, it is difficult to put the grab bucket in and out of the narrow opening, and even if it can be inserted through the narrow opening, the grab bucket is extended to the deep bottom. It is difficult to reach and reach the bottom of the enlarged manhole, and it is difficult to dredge the soil (especially, the working steps in the human hole become obstacles). There are technical problems such as difficulty in excavation and dredging.

From this viewpoint, Japanese Patent Application Laid-Open No. 61-246433
(Hereinafter referred to as "prior art") has been proposed. This prior art employs the following technical means. 1) A method in which a dredge attachment is detachably attached to the lower end of a multi-stage elevating post, and the following steps (a) to (f) are used to dredge sludge and earth and sand in human holes in sewers. (a) a step of vertically supporting the elevating post by a guide member directly above a human hole; (b) attaching a raking tool having a horizontally extensible raping plate to a lower end of the raising / lowering post; (C) a step of contracting the approaching tool and lowering it into the human hole by extending the elevating post, (c) a step of expanding and contracting the scraping tool to scrape the surrounding sludge and soil to a position below the elevating post, The contractor is retracted to raise the retractor by contracting the elevating post.Instead, a grab bucket is attached to the lower end of the elevator post, and the lift post is extended in a state where the grab bucket is closed. Dropping into the hole, (e) scooping the scraped sludge and earth and sand by a grab bucket, (f) pulling up the grab bucket by shrinking a lifting post with the grab bucket closed, Earth and sand Step of discharging. 2) A method in which a dredging attachment is detachably attached to the lower end of a multi-stage elevating post, and the following steps (a) to (h) are performed to dredge sludge and earth and sand in human holes in sewers. (a) a step of vertically supporting the elevating post by a guide member directly above the human hole, (b) attaching a digging attachment to a lower end of the elevating post, and lowering the digging attachment into the human hole by extending the elevating post. The process of
(c) after digging the consolidated soil layer by the excavation attachment, raising the excavation attachment by expansion and contraction of the elevating post, (d) attaching a horizontally stretchable scraper to the lower end of the elevating post. (C) contracting the scraping tool and lowering it into the human hole by extending the lifting post, (e) step of expanding and contracting the scraping tool to scrape the surrounding sludge and soil to a position below the lifting post, (f) shrinking the scraper and pulling up the scraper by contracting the elevating post; instead, attaching a grab bucket to the lower end of the elevating post, and extending the elevating post with the grab bucket closed; (G) a step of scooping the scraped sludge and earth and sand by a grab bucket, (h) shrinking of the lifting post with the grab bucket closed, Pull up on the Tsu door, step of discharging the sludge and sediment. 3) a post support frame mounted on the chassis of the vehicle so as to be undulating and pivotable; slidably disposed in a guide groove on the front surface of the post support frame, and a dredge attachment is detachably mounted at a lower end thereof, and is hollow. An upper post, an intermediate post and a lower post which are formed in sliding contact with each other and extend in a three-stage manner by two hydraulic cylinders provided inside the hollow portion of the lower post;
A lifting hydraulic cylinder disposed between the post support frame and an upper post of the lifting post, and taking up a reaction force on the post support frame;
The first-stage hydraulic cylinder of the lifting post is interposed between the upper post and the middle post, and its cylinder-side mounting part is fixed to the upper end of the middle part post, and the piston rod-side mounting part is the upper end of the upper post. The second stage hydraulic cylinder is interposed between the middle post and the lower post, the cylinder side mounting part is fixed to the upper end of the intermediate part post, and the piston rod side mounting part is the lower post. A lift-up hydraulic cylinder fixed to a lower end thereof, wherein the lifting hydraulic cylinder has a cylinder side pin-connected to a post supporting frame and a piston rod side connected to an upper post of the lifting post. Sediment dredge for holes. However, according to this prior art, the cross section of the elevating post is inevitably increased as the depth of the human hole increases, and it becomes difficult to insert the post into the opening of the human hole.
Furthermore, there is a problem that the ground height is large and it is difficult to work in a narrow space.

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned prior art, and is a further development of the prior art. Another object of the present invention is to provide a dredging method and a dredging device for sediment deposited in an overpass, which can exert its ability and can reduce the height above the ground.

To achieve the above object, the present invention employs the following constitution. That is, the method for dredging sediment deposited in a man-overpass according to the present invention is as described in claim 1, and forms a single guide column by adding a column having a predetermined cross section and a unit length. While inserting the guide column into the human hole, mounting a dredge bucket vertically movably along the guide column, and moving the sediment dredged by the bucket above the guide column. And discharge it to the ground. Further, a dredging device for sediment deposited in a man-overpass according to the present invention is as described in claim 3, and a guide column which is extended with a column of unit length; and is vertically movable along the guide column. A dredging grab bucket to be mounted, wherein the lower part of the guide column is made to be able to pop out.

(Operation) The guide column is held in a constant cross section,
It easily passes through the opening of the manhole together with the dredge bucket. Further, since the lower part of the guide column can be protruded, the dredging range of the bucket is expanded.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method and an apparatus for dredging sediment in a man-overpass according to the present invention will be described with reference to the drawings. FIG. 1 to FIG. 17 show an embodiment of an apparatus for performing dredging of sediment deposited in a passover manhole according to the present invention, so-called a dredging apparatus for so-called passover manhole (hereinafter, simply referred to as “dredge device”). That is, FIGS. 1 and 2 schematically show the entire dredging device S, and FIGS.
The configuration of each part is shown. In these figures, P indicates a passover manhole, O indicates an opening of the manhole P, and Q indicates sediment deposited on the bottom of the manhole P.

Vehicle H (see FIGS. 1 to 4) As shown in FIGS. 1 and 2, the dredging device S of the present embodiment comprises:
The vehicle is of a vehicle-mounted type, and H is a vehicle or a truck having a wheel-type carrier I. The dredging device S is mounted on the carrier I and can be moved to an appropriate position. J is the loading platform I
The rear outriggers K provided on both sides of the rear part of the vehicle are front outriggers provided on both sides of the front part of the carrier I. Also, L
Is a hydraulic unit.

The dredging device S (see FIGS. 1 to 17) The dredging device S is a long guide column 1 inserted into the overpass manhole P, and is moved up and down along the guide column 1. It comprises a bucket section 2 and a slide mount section 3 which supports the guide column section 1 and drives the bucket section 2 and has a position adjusting function.

Hereinafter, a detailed configuration of each part of the dredging apparatus S will be described. Guide pillar 1 (see FIGS. 1 to 11) The guide pillar 1 is a main part of the present invention, is inserted into the overhang manhole P with a unit length, and is vertically moved with respect to the bucket 2. In addition to providing guidance, the lower part has a special function that allows it to pop out. (Unit Column 10) (Refer to FIGS. 8 to 10) The guide column portion 1 is formed by adding a column having a unit length, that is, the unit column 10. 8 to 10 show an example of the unit pillar 10. In this embodiment, the U-shaped channel material 1
1 and a flat steel plate 12. A U-shaped channel material 11 is arranged on both sides, and the abdomen of the channel material 11 is rigidly connected with one flat steel plate 12 to form an I-shaped cross section. 14 are arranged. The joint 14 includes a protrusion 14a fixed to the upper end of the unit column 10 and a recess 14b fixed to the lower end. In the connection work, the protrusion 14a is fitted into the recess of the recess 14b, and these pin holes 14c are formed. , 14d are aligned, and a fixing pin (not shown) is inserted to fix the connection. In the concave portion facing the flat steel plate 12 of the unit column 10, a wire interlocking with the bucket portion 2 is arranged. In addition, the groove 11a of the channel material 11 performs a guiding action for rollers of the bucket 2 described later. The unit column 10 has a length L of 3
m. Thereby, during the insertion into the human hole P, the work can be performed with a margin within 4 m from the ground surface.

(See FIG. 11) (Lower Guide Pillar 1A) (See FIGS. 5 to 7) The lower part (lower guide pillar) 1A of the guide pillar part 1 is provided with a spring-out mechanism and is joined to the upper unit pillar 10 Upper column member 20, a driven member 21 whose upper part is fixed to the back part of the upper column member 20, a rocking column connected to the lower end of the upper column member 20 by a pin and joined to the lower end of the upper column member 20. Material 22, rocking column material 2
Link member 2 which is arranged at the rear part of link member 2 and forms a link mechanism
3. A pin is joined to the lower end of the rocking column member 22 to
2 and a hydraulic cylinder 25 interlocking with the link mechanism.
4, two sheaves 26 (26a, 26a)
b). More specifically, the reaction-receiving member 21 has a base end 27 at the lower end thereof, which is seated on the bottom of the human hole P. The upper column member 20, the swing column member 22, and the lower column member 24 are pin-connected to each other, and have a guide groove corresponding to the guide groove 11A of the unit column 10 on each side surface thereof. Connect at The link member 23 is a rocking pillar 2
1st link member 23a arranged between 2 and the to-be-forced member 21
And the second and third link members 23 in which the first link member 23a and the swinging column member 22 are vertically connected via pins.
b, 23c. The hydraulic cylinder 25 is mounted between the reaction-receiving member 21 and the swing column member 22 via a pin.

(Upper Guide Pillar 1B) The upper part (upper guide pillar) 1B of the guide pillar portion is suspended from the slide base 3 via a wire, and is subjected to vertical movement by winding and lowering the wire. A rear pillar 28 is attached to the upper guide pillar 1B at the rear of the main pillar of the unit pillar 10, and the rear pillar 2
8 comes into contact with the wall surface of the opening O of the human hole P. It should be noted that the upper guide column 1B can also be extended according to the unit column 10.

Bucket portion 2 (see FIGS. 12 and 13) The bucket portion 2 has a bracket, and an elevating saddle 30 that moves up and down along the guide post 1 and a hydraulic pressure attached to the bracket 31 of the elevating saddle 30. And a bucket main body 33 that is mounted to be openable and closable via a cylinder 32. The bucket portion 2 moves up and down by receiving a driving force via a driving wire arranged on the guide column portion 1. (Elevating Saddle 30) The elevating saddle 30 is a U-shaped saddle body 35 that holds the front and side surfaces of the guide pillar 1.
In addition, rollers 36 are arranged on both sides of the saddle body 35. The rollers 36 are fitted into the grooves 11a on both sides of the guide column 1 and roll along the grooves 11a. Saddle body 35
At the upper and lower ends, ends of driving wires for vertically moving the elevating saddle 30 are fixed (see FIG. 15).

FIG. 14 shows the arrangement of the guide column 1 and the bucket 2 at the opening of the manhole P. As shown in the figure, the back pillar 28 of the guide pillar 1 is applied to the wall of the opening of the human hole P, the guide pillar 1 occupies the corner of the opening of the human hole P, and the bucket 2 is Pass the extra space with plenty of room. In the present embodiment, the guide pillar 1
Since the occupied cross-section does not substantially change in the vertical direction, the passage space of the bucket portion 2 is sufficiently ensured.

Slide base 3 (see FIGS. 1 to 4 and FIG. 16) The slide base 3 has a base 40 mounted on a loading platform I of a vehicle H as a base, and a frame structure and various components are mounted on the base 40. A configuration in which a driving device is installed is adopted. (Frame Structure) (See FIGS. 1 to 4) A support frame 41 is fixed to the base 40, and a guide frame 42 is fixed to a tip of the support frame 41 via a pin. A hydraulic cylinder 43 is fixed between the frames 42 via pins. Thereby, the piston 43a of the hydraulic cylinder 43
The guide frame 42 performs an undulating operation by the expansion and contraction operation of.
A sheave 45 interlocked with the guide column 1 and a sheave 46 interlocked with the bucket 2 are provided on the upper part of the guide frame 42. In the upright state of the guide frame 42, the maximum height h from the ground including the loading platform I is suppressed as low as possible. That is, since the guide pillar 1 is formed by adding the unit pillar 10 of about 3 m, the length is within 4 m in consideration of the extra length. As a result, there is no hindrance to work under the power line or under the bridge.

(Hydraulic winch 48) (FIGS. 3, 4 and 1)
5) The hydraulic winch 48 performs a driving operation of the wire system according to the present dredging apparatus S. The wire system of the present dredging apparatus S is composed of a wire system 49 for moving the guide column 1 up and down and a wire system 50 for moving the bucket unit 2 up and down. The guide column wire 49 is fixed to the upper end of the guide column 1, and is wound around the winch 48 via the sheave 45. As shown in FIG. 18, the wire 50 for the bucket portion includes a lifting portion 50a connected to the upper end of the bucket portion 2 and the bucket portion 2.
And a pull-down wire 50a connected to the lower end of the winch 48a via a sheave 46a.
The pull-down wire 50b passes through the sheaves 25a, 25b at the lower end of the guide post, and
Is wound up on the winch 48.

(Hose Reel 52) (See FIGS. 1 and 3) The hose reel 52 takes up the hydraulic piping system of the dredging device S. The hydraulic system of the dredging device S includes a hydraulic system 1 connected to a hydraulic cylinder 32 of the bucket unit 2, a lower guide column 1
The hydraulic system 2 includes a hydraulic system 2 connected to the hydraulic cylinder 26 in the link mechanism A, a hydraulic system 3 connected to a hydraulic cylinder 43 having a frame structure, and a hydraulic system 4 of a hydraulic cylinder incorporated in the base 40. The hose reel 52 performs winding and rewinding of the hydraulic systems 1 and 2.

(Base 40) (see FIG. 16) The base 40 is movable in the horizontal direction. Fig. 16 (a)
(b) shows an example of the mechanism, and the base 40 is an outer frame 40
a and the inner frame 40b, and hydraulic cylinders 54 and 55 for the front-rear direction and the width direction are provided. Reference numeral 56 denotes a reaction force receiver for the inner frame 40b, and reference numeral 57 denotes a slip surface on the loading platform I. The outer frame 40a is movable back and forth with respect to the inner frame 40b, and the inner frame 40b is movable only in the width direction.
The front-rear direction hydraulic cylinder 54 takes a reaction force on the inner frame body 40b to move the outer frame body 40a in the front-rear direction, and the width-direction hydraulic cylinder 55 takes a reaction force on the loading platform I to form the outer frame body 40a.
Then, the inner frame 40b is moved in the width direction.

A method for performing dredging in a manhole in a concealed manhole A method for performing dredging of earth and sand in a manhole in a concealed manhole performed using the dredging apparatus S of this embodiment will be described. Hereinafter, description will be given based on the construction procedure. First, in the present dredging apparatus S, the guide column 1, the bucket 2, and the slide base 3 are separated from each other. In particular, the guide column 1 starts with the unit column 10, the lower guide column 1A, and the upper guide column 1B Are separated. The vehicle H is equipped with the slide base 3 and stands by near the human hole P.

(1) Assembly and Installation of the Guide Column 1 The assembly and installation of the guide column 1 through the opening O of the human hole P are performed as follows.

(1a) Installation of the lower guide post 1A The lower guide post 1A is inserted in the contracted state from the opening O of the human hole P, and its upper end is projected from the opening O, that is, exposed in the ground surface. Temporarily accept. For this temporary placement,
At the surface of the ground, a temporary receiving stand (not shown) is prepared, or the work vehicle H is used, and the guide frame 4 is used.
It is also possible to use the function of hanging the wire from the second. A wire 50 to be connected to the bucket portion 2 later is attached to the lower guide column 1A.
The hydraulic hose that communicates with is pulled out to the ground.

(1b) Building of the unit pillar 10 The unit pillar 10 is built from above the lower guide pillar 1A, assembled as one body through these joints 14, and sequentially lowered into the human hole P. In the lowering step, a temporary receiving operation is performed, and an operation of arranging wires and hydraulic hoses is performed.

(1c) Installation of the upper guide post 1B When the lower end of the guide post 1 being assembled reaches near the bottom of the human hole P, the upper guide post 1B with the back post 28 is added and assembled.

(2) Next, the working vehicle H is arranged facing the opening O of the human hole P, and the hydraulic cylinder 4 having the frame structure is arranged.
3 is operated to erect the guide frame 42 vertically.

(3) The guide column 1 is suspended via a wire 49 suspended from the guide frame 42. At the same time, the bucket 2 is attached to the upper guide column 1B. Thereafter, the wire 50 of the bucket section 2 of the present dredging apparatus S and the hydraulic piping system are connected, and mounted on the winch 48 and the hose reel 52.

(4) The back pillar 28 of the upper guide pillar 1B is abutted against the wall surface of the opening O while the guide pillar 1 is held vertically by the sliding function of the slide base 3 of the dredging apparatus S. Causes the guide column 1 to land on the bottom of the human hole P by winch operation of the wire 49.

(5) Start of dredging The bucket 2 is lowered to the bottom of the human hole P along the guide column 1, and the hydraulic cylinder 32 is operated to scoop up the soil Q at the bottom of the human hole. Raise the bucket 2 and
Carry out to the ground. FIG. 5 shows this state. At this time, the pull-down 50b of the wire 50 is operated to press the bucket body 33 against the sediment Q.

(5a) The wire 50a for winding up the wire 50 is wound up, and the bucket 33 is guided to the ground. The bucket portion 2 is stably raised by the guide action of the rollers 36. When the bucket 33 is opened, the dredged soil is discharged to the dump truck via the chute. (5b) Repeat dredging as above.

(6) Expansion of Dredging Range The hydraulic cylinder 26 of the lower guide column 1A is operated, and the rocking column member 22 is pushed forward by the link mechanism to widen the dredging range. FIG. 7 shows this state. At this time, the bucket part 2 is guided along the lower end column member 24,
4 can descend to the bottom of the sediment Q. When the bucket portion 2 is pulled up, the hydraulic cylinder 26 is contracted to return the rocking column member 22 to the original state, and thereafter, the pulling wire 50a is wound up. In addition, bucket part 2
The release operation of is based on the step (5a).

(7) Movement of the guide post 1 Next, the guide post 1 is lifted, and the slide post 3 is moved to move the guide post 1 to a new position.
Step (4) is performed, and steps (5) and (6) are performed.

(8) When the dredging of the sediment sediment Q at the bottom of the human hole P is completed through the above steps, the bucket 2 is removed, and then the unit pillar 10 is removed while the guide pillar 1 is sequentially pulled up. With the above, this dredging work is completed.

In the above, when the guide column 1 is installed via the slide base 3 of the working vehicle H, the step (2) is performed prior to the step (1), and the wire in the step (3) is used. The suspension work of 49 is omitted.

According to the dredging work in the human hole according to the present embodiment,
Since the guide column 1 is not limited by its length and is formed by adding the unit columns 10, the cross section does not increase, and the guide column 1 and the bucket 2 attached to the guide column 1 are not limited. It can easily pass through the opening O of the hole P, and can perform dredging of the sediment Q deposited at the bottom of the deep human hole P. In addition, since the guide pillar 1 is formed by adding a relatively short unit pillar 10,
The work on the ground part is defined by the length of the unit pillar 10, and the work on the ground part can be made as low as possible. Therefore, the work under the power line or bridge can be performed. Further, the bucket portion 2 is guided by the guide column portion 1 with the rollers 36, stably moves up and down, and the dredging range can be expanded by the pop-up function of the link mechanism of the lower guide column 1A. Further, the bucket portion 2 can apply a pressing force against the sediment Q to the bucket portion 2 by the pull-down wire 50b of the drive wire 50, and the dredging performance increases. According to the dredging device S of the present embodiment, the slide gantry 3 is horizontally movable, so that the position movement and position adjustment of the guide column 1 can be easily performed, and the construction efficiency is improved.

In this embodiment, the guide column 1 is suspended from the sheave 45 of the guide frame 42. However, the guide column 1 may be vertically moved along the guide frame 42. FIG. 18 shows one embodiment thereof. In the figure, the same reference numerals are given to members equivalent to those in the above embodiment. A plurality of guide claws 70 are attached to the front surface of the guide frame 42, and slidably hold the rear pillar 28 of the upper guide pillar 1 </ b> B of the guide pillar 1.

The present invention is not limited only to the above-described embodiment, and various design changes can be made within the scope of the basic technical concept of the present invention. That is, the following embodiments are included in the technical scope of the present invention. Unit pillar 1 shown in the previous embodiment, attached to guide pillar 1
The configuration of the joint 14 is not limited to zero, and other appropriate configurations can be adopted. The cross-sectional configuration of the unit column 10 pertaining to the guide column 1 is not limited to the above embodiment, and may take other shapes.

[0035]

According to the present invention, since the cross section of the guide post is maintained at a constant cross section even when the length of the guide post is increased, the approach of the manhole opening of the dredging bucket is not hindered, and the manhole of the large depth can be prevented. Dredging of sediment will be possible. Further, since the guide column is formed by adding column members of unit length, the height above the ground is made as low as possible, and work in a narrow space is possible. The dredging bucket is stably guided by the guide pillars, and the dredging range can be easily expanded by the protruding function of the lower guide pillars.

[Brief description of the drawings]

FIG. 1 is a side view showing an entire embodiment of a dredging apparatus for sediment deposited in a man-overpass according to the present invention.

FIG. 2 is a front view of FIG. 1;

FIG. 3 is an enlarged view of the upper part of the dredging device.

FIG. 4 is a view in the direction of arrow IV in FIG. 3;

FIG. 5 is a detailed structural view of a lower portion of the guide column 1 of the present dredging apparatus (a view in the direction of arrow V in FIG. 6).

FIG. 6 is a view taken in the direction of arrow VI in FIG. 5;

FIG. 7 is an operation diagram of a lower guide column.

FIG. 8 is a side view of a unit pillar.

FIG. 9 is an enlarged sectional view of a unit column.

FIG. 10 is a view of one embodiment of a joint structure of a unit column.

FIG. 11 is a view showing one embodiment of the structure of the upper guide column.

FIG. 12 is an enlarged side view of a dredge bucket.

FIG. 13 is a front view of a dredge bucket.

FIG. 14 is a layout view of an opening of a human hole.

FIG. 15 is a diagram illustrating a configuration example of a wire system of a bucket unit 2.

FIG. 16 is a view showing one embodiment of the configuration of the base of the slide base.

FIG. 17 is another mode diagram of the upper part of the present dredging apparatus.

FIG. 18 is a cross-sectional view of a sheltered portion.

[Explanation of symbols]

P: Overpass, O: Opening, Q: Sediment, 1: Guide column, 2: Bucket, 3: Slide base, 10 ...
Unit pillar

Claims (4)

[Claims] 1. A guide pillar having a predetermined cross section and having a unit length is inserted into a human hole while forming one guide column by adding a column body, and the guide column is built into the human hole. Characterized in that a dredge bucket is mounted so as to be movable up and down along the path, and the sediment dredged by the bucket is moved above the guide post and discharged to the ground. 2. The method according to claim 1, wherein the lower portion of the guide column is capable of being protruded, and the sediment is dredged in the overpass. 3. A guide column which is extended with a unit length column; a dredge grab bucket which is mounted to be movable up and down along the guide column; and a lower portion of the guide column is capable of popping out. An apparatus for dredging sediment in a man-overhead hole. 4. The dredging device according to claim 3, wherein the guide column is suspended so as to be suspended.