JP2876293B2 - Hopper equipment for sandy soil supply - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hopper device for supplying sandy soil used in a packed drain device for improving the ground of soft ground.

[0002]

2. Description of the Related Art A sand drain method is widely used as a method for improving soft ground in a landfill.
This sand drain method is a method in which a large number of sand pile drains are installed in the ground, and pore water in the soft ground is drained to the ground through the drain to harden the soft ground. However, in the sand drain method, since the sand pile is provided directly in the ground, the sand pile may be constricted or cut off in the middle, and a defective drain with insufficient drainage capacity may be formed.

[0003] The applicant of the present invention has proposed a method called a packed drain method in order to solve the above-mentioned drawbacks of the sand drain method. In this packed drain method, a water-permeable bag is suspended in a casing pipe having a lid that can be opened and closed at the lower end, and after filling the sandy soil into the bag, the casing pipe is pulled out and a sand pile is placed in the ground. In this method, soft ground is hardened in a short period of time by draining pore water in the ground to the ground through the drain. Furthermore, the applicant of the present application has proposed an improvement in which the entire process of inserting and extracting a casing pipe as described in JP-A-63-272813 can be performed near the ground in order to secure the safety of the packed drain method. The proposed packed drain device was proposed.

In the pack drain device disclosed in the above publication, a mast is erected on a crawler body, and a guide body having a guide hole for inserting a casing pipe and having a clamp mechanism and a vibratory hammer are moved from the upper end of the mast. It is suspended vertically so that four casing pipes can be grasped / opened by the clamp mechanism of the guide body, and a sandy soil supply hopper is installed on the mast so as to be pivotable.

Here, the structure of a sandy soil supply hopper device used in this device will be described with reference to FIG.
This hopper device has sandy soil supply ports 82a-
A bottom wall 81 having a rectangular shape formed with 82d;
And a front wall 84 extending obliquely upward from the bottom wall 81, and a right side wall 85 and a left side wall 86. Into this hopper device, sandy soil is poured at once from the front upper side with a dozer shovel or the like, and the sandy soil is suspended in a water-permeable bag suspended in each casing pipe using the vibratory hammer's vibrating force. Was supplied to each of the sandy soil supply ports 82a to 82d.

[0006]

However, since the sandy soil is introduced into the hopper from a front upper portion of the hopper using a dozer excavator or the like, the sandy soil is thrown into the front part of the hopper. Is accumulated. In addition, sandy soil is supplied from a hopper device to the permeable bag suspended in each casing pipe by using the vibrating force of a vibro hammer. Since it is pivotally attached to a mast erected on the main body, the vibration is restricted on the rear side of the hopper device, and the vibration on the rear side is smaller than the magnitude of the vibration on the front side of the hopper device.

For these reasons, the sandy soil is easily supplied into the bag from the sandy soil supply ports 82a and 82b on the front side of the hopper device, but the sandy soil supply port 82c on the rear side of the hopper device.
It is difficult to supply sandy soil from 82d. As a result, the filling speed of sandy soil is different between the front and rear bags, and the filling of the rear bag is completed even though the filling of the front bag has been completed. Sand supply work had to be continued until the completion, and there was a technical problem that reduced the work efficiency of sand supply.

In addition, even though the filling of the front bag has been completed, the sand supply operation is continued until the filling of the rear bag is completed. Therefore, the front bag is densely filled with sandy soil. Inflate the bag radially. As a result, when the casing is pulled out from the ground, there is a technical problem that a bag is pulled out together with the casing, that is, a so-called co-up phenomenon is caused.

Further, sandy soil is introduced into the hopper device with a dozer excavator or the like.
In some cases, sandy soil adhered to the inner wall of the hopper device and the vicinity of the sandy soil supply port, and the supply of sandy soil to each bag was sometimes hindered.
In particular, in the case of fine sand containing a large amount of silt components, sandy soil often adheres to the inner wall of the hopper device or the vicinity of the sandy soil supply port. I had to work such as scraping off the soil.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. By defining the inclination angle of an inclined plate or the like for guiding sand to each supply port, the supply ports can be evenly and uniformly provided. It is an object of the present invention to provide a sandy soil supply device capable of supplying sandy soil without adhering to an inner wall or a vicinity of a sandy soil supply port.

[0011]

According to the present invention, in order to solve the above-mentioned problems, a pair of sands provided on a front side and a rear side respectively for supplying sandy soil to a bag in a casing pipe. A solid soil supply port, a rear wall extending upward from the rear sandy soil supply port, a front wall inclined upward and outward from the front sandy soil supply port, and an upper outside from the front side supply port. Left and right side walls including inclined walls inclined toward the front, an inclined plate inclined from the upper part of the front wall toward the rear sandy soil supply port and having notches of a predetermined shape on both front sides, and each sandy soil supply port A hopper device for supplying sandy soil having four sandy soil storage portions formed by combining each of the walls, the sloping plate and the partitioning plate, wherein the sloping walls of the left and right side walls, And the front wall is 50 ° <θ <7 with respect to the horizontal plane.
The basic configuration is that the inclination plate has an inclination angle θ of 0 ° and the inclination plate has an inclination angle θ of 20 ° <θ <40 ° with respect to a horizontal plane. Further, the partition plate preferably has an inclination angle θ of 50 ° <θ <70 ° with respect to a horizontal plane.

[0012]

The sandy soil is put into the hopper device 7, the valves of the sandy soil supply ports 26a to 26d are opened, and the bag is filled with the sandy soil. At this time, the inclined walls of the left and right side walls are formed at an inclination angle θ of 50 ° <θ <70 ° with respect to the horizontal plane, and the inclined plate has an inclination angle θ of 20 ° <θ <40 ° with respect to the horizontal plane. The inclination angle θ of the front wall is formed at 50 ° <θ <70 ° with respect to the horizontal plane, and the inclination angle θ of the partition plate is set at 50 ° <θ <70 ° with respect to the horizontal plane. Because it is formed, the supplied sandy soil falls without stopping on the slope and without adhering, and for each supply port,
Sandy soil is supplied uniformly. As a result, the work efficiency of the sand supply can be improved, and so-called rising can be prevented.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on embodiments. FIG. 1 shows an overall view of a packed drain device in which the present invention is used, and FIG. 2 shows an enlarged view of a portion A in FIG. As shown in the figure, a mast 2 is erected on the crawler main body 1, and a guide body 4 and a vibratory hammer 5 are suspended from a top end of the mast 2 by a wire 3. Also, 4
The casing pipes 6 a to 6 d are erected along the mast 2 by the guide of the guide body 4. Further, a hopper device 7 is mounted near the lower end of the mast 2 so as to be pivotable about the mast 2 and to be able to move up and down a fixed amount along the mast 2.

The guide body 4 has a substantially square shape when viewed from above, and has casing pipes 6a to 6a at its corners.
Guide holes 8a to 8d for inserting 6d are formed respectively. As shown in FIG. 3, semi-circular clamps 9a to 9d are provided inside the guide holes 8a to 8d.
9d and 10a to 10d are respectively attached (only a portion corresponding to the guide hole 8a is shown in FIG. 3). The clamps 9a to 9d are fixed inside the guide holes 8a to 8d, and the clamps 10a to 10d move freely in the radial direction of the guide holes 8a to 8d by the action of the cylinders 11a to 11d. 6d can be held and released. A guide roller (not shown) is attached to one side of the guide body 4 so as to be able to slide on the side surface of the leader 2 ′ of the mast 2.

The vibratory hammer 5 is mounted on the guide body 4, and is used for inserting the casing pipes 6a to 6d into the ground and pulling out the casing pipes from the ground.

The casing pipes 6a to 6d are made of a very long steel pipe having a diameter of, for example, 12 cm and a length of 20 to 30 m, and have upper and lower lids 6a 'to 6d' as shown in FIG. Lower lids 6a "to 6d" are attached to be openable and closable. The casing pipes 6a to 6d are vertically installed along the mast 2 while being inserted through the guide holes 8a to 8d of the guide body 4.

The base end of the wire 3 is wound around a drum 12 on the crawler body 1. The drum 12 is rotated forward or backward by a known driving means to wind or unwind the wire, thereby guiding the wire. The body 4 and the vibro hammer 5 can be freely moved up and down.

Next, the hopper device 7 according to the present invention will be described in detail with reference to FIGS. Hopper device 7
Is used for filling sandy soil into a water-permeable bag suspended in the casing pipes 6a to 6d, and includes a metal bottom wall 21, a rear wall 22, a right side wall 23, It consists of a left side wall 24 and a front wall 25.

The bottom wall 21 has a rectangular shape, and sandy soil supply ports 26a to 26d are formed at each corner. In FIG. 5, a part of the bottom wall is represented by a virtual line. The bottom wall 21 is formed of one flat plate, and sandy soil supply ports 26a to 26d are formed at each corner.
The bottom wall 21 is separately provided in each of the sandy soil supply ports 26a to 26d.
May be formed. The bottom wall 21 is not always necessary, and the sandy soil supply ports 26a to 26d may be formed by the rear wall 22, the right side wall 23, the left side wall 24, the front wall 25, and the like. The diameter of the sandy soil supply ports 26a to 26d is determined by the diameter of the water-permeable bag used.

A rear wall 22 extends vertically at the rear of the bottom wall 21, and a front wall 25 extends forward and upward at the front of the bottom wall 22. The right side wall 23 includes an inclined wall 23A extending upward and outward from the right end of the bottom wall 21, a vertical wall 23B extending vertically, and a connecting wall 23C connecting these walls. Like the right side wall 23, the left side wall 24
Is composed of an inclined wall 24A extending upward and outward from the left end of the bottom wall 21, a vertical wall 24B extending vertically, and a connecting wall 24C connecting these.

The upper part of the front wall 25 and the left and right side walls 23, 2
An apron portion 28 is attached to the upper front of the inclined wall 4, and an inclined plate 29 is installed from the upper portion of the front wall 25 to the rear portion of the bottom wall 21. First and second sandy soil accommodating portions 38a, 38 are provided on the left and right sides on the front side of the inclined plate 29.
b (described later) are formed with notches 30 and 31 which are entrances of sandy soil, and portions 29A and 29B of the inclined plate 29 are formed.
Serves as a baffle for the first and second sandy soil storage portions 38a, 38b. The inclination angle of the inclined plate 29 and the shapes of the notches 30, 31 are determined by the four sandy soil supply ports 26a to 26-2.
The sandy soil is set so that the sandy soil filling speed into the bag from 6d is substantially the same.

Two partition plates 32 and 33 are provided on the front left side of the hopper device toward the sandy soil supply port 26a, and on the front right side are two partition plates 32 and 33 facing the sandy soil supply port 26b. Partitioning plates 34, 35 are provided, and further, sandy soil supply ports 26c, 26d are provided at the rear portion in the hopper device, respectively.
Are provided, whereby four sandy soil storage portions 38a to 38d are formed in the hopper device. That is, the front wall 25, the inclined wall 24A of the left side wall 24, the partition plate 32, and the partition plate 33 form the first sandy soil storage portion 38a, and the front wall 25, the inclined wall 23A of the right side wall 23, and the partition plate 34. A second sandy soil accommodating portion 38b is formed by the partitioning plate 35 and the third sandy soil accommodating portion 38c by the rear wall 22, the respective wall portions 24A to 24C of the left side wall 24, the inclined plate 29, and the partitioning plate 36. Are formed, and the rear wall 22, the right side wall 23, the wall portions 23A to 23C, the inclined plate 29, and the partition plate 37 form a fourth sandy soil storage portion 38d.

Here, the inclination angles of the left and right side walls and the front wall will be described in detail. The inclination angles θ of the left and right side walls and the front wall with respect to the horizontal plane (bottom wall) are preferably 50 ° or more, and more preferably. Is formed at an angle of 50 ° or more and 70 ° or less. In order for the supplied sandy soil to fall on the slope, the angle must be a certain angle or more. On the other hand, if the angle is increased, the sandy soil is enough to fall, but in order to secure a certain amount of volume, the height of the hopper device must be increased, and with a dozer shovel. Work becomes impossible. In addition, sandy soil supply ports 26a, 2
6b is formed apart from the lower end portions of the inclined walls of the left and right side walls or the lower end portion of the front wall, and the inclined walls or the front wall of the left and right side walls are 90 ° with respect to the horizontal plane (bottom wall).
When formed at an angle close to, the sandy soil supply port 26a and the sandy soil supply port 26a and the sandy soil that is not supplied to the sandy soil supply port 26b remain near the sandy soil supply port 26b. Become. In order to solve this, the sandy soil supply ports 26a and 26b may be formed near the lower end portions of the inclined walls of the left and right side walls or the lower end portion of the front wall. If the front wall is formed close to 90 °, the sandy soil capacity of the hopper device becomes extremely small. Therefore, the sandy soil supply ports 26a and 26b are formed near the lower end portions of the inclined walls of the left and right side walls or the lower end portion of the front wall, and the inclined wall and the front wall of the right side wall are defined at a certain angle or less. However, it is necessary to secure the sandy soil capacity of the hopper device. When the inclination angles θ of the left and right side walls and the front wall are obtained from the above points, the inclination angle θ is 50 ° or more, preferably 5 °
It is preferable to form it at 0 ° or more and 70 ° or less.

The inclined plate is formed to have an inclination angle θ of 20 ° or more and 40 ° or less with respect to a horizontal plane (bottom wall). The angle of the inclined plate must be equal to or greater than a certain angle in order for the sandy soil to fall on the slope, as in the case of the above-mentioned front wall and left and right side walls.
On the other hand, if the angle is increased, the sandy soil is enough to fall, but in order to secure a certain amount of volume, the height of the hopper device must be increased, and with a dozer shovel. Work becomes impossible. In addition, the sandy soil supply port 26c, 2
For 6d, it is necessary to supply the same amount as the sandy soil supplied to the sandy soil supply ports 26a and 26b. When the inclination angle θ of the inclined plate is obtained from the above points, it is preferable that the inclination angle θ is formed in the range of 20 ° to 40 °.

Further, since the partition plate separates each supply port, the inclination angle θ of the partition plate is 9 ° with respect to the horizontal plane.
What is necessary is just the inclination angle of 0 degrees or less. However, the sandy soil supply ports 26a, 26
It is necessary to prevent sandy soil not supplied to the respective sandy soil supply ports from remaining near b, 26c, and 26d. When the inclination angle is small, the sandy soil is difficult to fall on the slope, and the sandy soil supply ports 26a, 26b, 26c, 26d
And sandy soil cannot be supplied uniformly. Therefore, as in the case of the above-described inclined walls of the front wall and the left and right side walls, the inclination angle θ is preferably set to 50 ° or more, preferably 50 ° to 70 °.

The sandy soil used in the hopper device for supplying sandy soil preferably has a sand (silt) component having a particle size of 74 μm or less in an amount of 10% by weight or less. That is,
In the case of using sandy soil containing a large amount of a sand (silt) component of 74 μm or less, even in the case of the hopper device having the above-described inclination angle, the sandy soil is formed on the inner wall of the hopper device or near the sandy soil supply port. This is because they often adhere.

A valve (not shown) which can be opened and closed is attached to the sandy soil inlets 27a to 27d, and a compression is provided near the bottom of each sandy soil storage portion 38a to 38d of the hopper device 7. An injection port of an injection mechanism (not shown) for injecting air is arranged, and is configured so that sandy soil attached near the sandy soil supply port can be removed by injecting compressed air as necessary. I have. Reference numeral 39 in the figure denotes a flange for attaching a vibro hammer. Further, in the above description, the hopper device 7 is attached to the mast 2, but the hopper device 7 does not necessarily need to be attached to the mast 2,
It may be used while suspended by a crane or the like.

Next, the operation of the packed drain device using the hopper device of this embodiment will be described. (1) First, the casing pipes 6a to 6d are inserted into the guide holes 8a to 8d of the guide body 4 with the upper lid and the lower lid closed, and are vertically built along the mast 2,
The casing pipes 6a to 6d are gripped by the clamps 9a to 9d and 10a to 10d. (2) Next, the vibratory hammer 5 is operated and the wire 3 is gradually loosened, and the casing pipes 6a to 6d
After a certain length is inserted into the ground, the vibro hammer 5 is stopped and the wire 3 is tightened, and then the clamp is released. (3) Next, the wire 3 is wound up by operating the drum 12, and the guide body 4 is pulled up to the initial position. (4) Clamp the casing pipes 6a to 6d again,
The vibratory hammer 5 is operated and the wire 3 is gradually loosened, and the casing pipes 6a to 6d are inserted deeper into the ground. (5) The following operations (1) to (4) are repeated to insert substantially the entire length of the casing pipes 6a to 6d into the ground. (6) Next, the upper lids of the casing pipes 6a to 6d are opened, and a permeable bag is hung therein, and the lower ends thereof reach the bottoms of the casing pipes 6a to 6d. (7) Next, the hopper device 7 is turned around the mast 2 so as to be superimposed on the guide body 4 and the hopper device 7
Sand inlets 27a-27d and casing pipe 6a
To 6d. (8) Next, sandy soil is put into the hopper device 7. As described above, a sandy soil having a particle size of 74 μm or less and a sand (silt) component of 10% by weight or less is used as described above. Accordingly, it is possible to prevent the sandy soil from adhering to the inner wall of the hopper device and the vicinity of the sandy soil supply port. (9) Next, the valves of the sandy soil supply ports 26a to 26d are opened, and the bag is filled with the sandy soil. At this time, the inclined walls of the right and left side walls are formed at an inclination angle θ of 50 ° <θ <70 ° with respect to the horizontal plane, and the inclined plate has an inclination angle θ of 20 with respect to the horizontal plane.
° <θ <40 °, and the inclination angle θ of the front wall
Is formed at 50 ° <θ <70 ° with respect to the horizontal plane, and the inclination angle θ of the partition plate is 50 ° <θ <7 with respect to the horizontal plane.
Since it is formed at 0 °, the supplied sandy soil falls on the slope without stopping and adhering, and the sandy soil is uniformly supplied to each supply port. (10) After the filling is completed, the hopper device 7 returns to the original position. (11) Next, the casing pipes 6a to 6d are clamped,
By opening these lower lids, activating the vibratory hammer 5, and gradually winding up the wire 3, only the casing pipes 6a to 6d are gradually pulled out by a certain length. (12) Next, the clamp is released, the wire 3 is loosened, only the guide body 4 is returned to the initial position, and then the casing pipes 6a to 6d are clamped again. Next, the casing pipes 6a to 6d are further pulled out by operating the vibratory hammer 5 and gradually winding up the wire 3. (13) The above operations (11) and (12) are repeated to completely pull out the casing pipes 6a to 6d. As described above, the casing pipes 6a to 6a
Drains having the same diameter as the inner diameter of d and the same length as their length are installed.

[0029]

As described above, according to the present invention, the sandy soil is introduced into the hopper device 7 by a dozer excavator or the like. Of the front wall and the inclination angle θ of the front wall are defined as 50 ° <θ <70 °, and the inclination angle θ of the inclined plate is set at 20 ° <θ <40.
°, the sandy soil is appropriately dispersed and stored in the four sandy soil storage portions 38a to 38d without being concentrated in the first and second sandy soil storage portions 38a and 38b. Therefore, the sandy soil can be almost uniformly filled in each bag, and a phenomenon such as rising can be prevented, and workability can be significantly improved.

Also, since the inclination angle of the partition plate is specified,
The sandy soil can be more uniformly and efficiently supplied from the sandy soil storage section to the bag, and a phenomenon such as rising can be prevented, and workability can be significantly improved.

[Brief description of the drawings]

FIG. 1 is a front view showing a packed drain device according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a portion A in FIG.

FIG. 3 is a plan view showing a guide hole and a clamp mechanism of a guide body.

FIG. 4 is a side view of a casing pipe.

FIG. 5 is a partially cutaway perspective view showing the structure of a hopper device in the device according to the embodiment of the present invention.

FIG. 6 is a top view of the hopper device.

FIG. 7 is a right side view of the hopper device.

FIG. 8 is a partially cutaway perspective view showing the structure of a hopper device in a conventional packed drain device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Crawler main body 2 Mast 3 Wire 4 Guide body 5 Vibro hammer 6a-6d Casing pipe 7 Hopper device 21 Bottom wall 22 Back wall 23 Right side wall 24 Left side wall 25 Front wall 26a-26d Sandy soil supply port 27a-27d Sandy soil Input port 28 Apron part 29 Inclined plate 30, 31 Notch 32-37 Partition plate 38a-38d Sandy soil container 40a-40d Bag

Continuation of the front page (56) References JP-A-7-71024 (JP, A) JP-A-62-272813 (JP, A) JP-A 48-69506 (JP, U) JP-A 2-50427 (JP) , U) (58) Fields surveyed (Int. Cl. ⁶ , DB name) E02D 3/10 104 B65D 88/26

Claims (2)

(57) [Claims] 1. A pair of sandy soil supply ports respectively provided on a front side and a rear side for supplying sandy soil to a bag in a casing pipe, and an upward direction from the rear sandy soil supply port. A front wall inclined upward and outward from the front sandy soil supply port, right and left side walls including an inclined wall inclined upward and outward from the front supply port, and from the top of the front wall. An inclined plate inclined toward the rear sandy soil supply port and having notches of a predetermined shape on both front sides; and a partition plate directed to each sandy soil supply port, wherein each of the walls, the inclined plate, and the partition plate In the sandy soil supply hopper device having four sandy soil storage portions formed by a combination of the above, the inclined walls on the left and right side walls and the front wall are 5
A hopper for supplying sandy soil, wherein the hopper has an inclination angle θ of 0 ° <θ <70 ° and the inclined plate has an inclination angle θ of 20 ° <θ <40 ° with respect to a horizontal plane. apparatus. 2. The method according to claim 1, wherein the partition plate is at 50 ° <with respect to a horizontal plane.
2. The hopper device for supplying sandy soil according to claim 1, wherein the inclination angle [theta] is [theta] <70 [deg.].