JPH0621450B2 - Sand anti-construction method and its equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention provides a sand pile (columnar body of sand) in soft ground as a means for stabilizing and strengthening soft ground, and the ground is passed through the sand pile. The present invention relates to a so-called sand drain construction sand pile structure construction method for concentrating moisture in the inside and a device therefor.

[Prior Art] As a sand pile construction method and apparatus of this type, there is an invention disclosed in Japanese Patent Publication No. 58-39982 which was previously developed by the present inventor.

The present invention is that the bag body conventionally filled with sand is configured to have a predetermined length of one sand pile unit, and it is difficult to insert the sand bag body into the steel pipe casing. In order to solve the problems such as setting the body and filling the bag with sand, driving it into the ground together with the casing, burying the remaining parts when pulling up, labor is troublesome, and large work loss, a tubular bag Sand bellows shrinkage-held around the outer circumference of the sand introduction pipe, attached to the sand hopper so that several sand piles can be formed continuously without the need for removal. Each sand bag can be detachably replaced to eliminate the trouble of removing the sand bag, and air can be blown into the upper part of the casing to increase the internal pressure to hold the sand piles filled with sand properly. Leave inside to make it easier to pull up the casing and It was to prevent the rise.

[Problems to be Solved by the Invention] In the above invention, since the sand-filled bag is loaded by the vibration of the driving and the gravity at the same time as the driving of the sand pile casing, the sand pile can be reliably formed up to the tip of the sand pile casing. On the other hand,
A nozzle that ejects air to the upper part of the casing and a damper that closes the ejected air to apply a predetermined pressure to the upper surface of the sand pile filling bag in the space above the casing to prevent the sand bag from rising when the casing is pulled out. Device, a valve device for dropping or stopping sand from the sand hopper into the tubular body through the sand introduction pipe, and those operations are required,
The device mechanism is complicated, and the sequence of operations and the work procedure are complicated. Further, since the tubular bag is a bellows-shaped fold and shrinks and holds it around the sand introduction tube, its cylindrical length is limited, and the continuous formation of sand piles is limited to about several. Moreover, the biggest problem is that when the sand pile casing is pulled up, air is blown in to hold the sand bag inside the casing and leave it in the ground. It takes time to fill the bag with sand prior to the driving, and there is a large loss of work time, and there are problems in improving work efficiency and streamlining workability.

Therefore, the present invention eliminates these problems, and the complexity of work, does not require any difficult operation, and since the sand-filled bag can be continuously formed in the casing, it is possible to drive the casing into the soft ground. At the same time, sand piles can be created, and the next sand-filled bag is automatically formed inside the casing when the casing is pulled out.Therefore, in the continuous work of driving the casing connected to the vibro hammer into the soil and pulling it out without waiting. It is intended to provide a new construction method and equipment for continuously constructing sand piles in the ground.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention has a sand hopper (4) and a sand introduction directly above a steel pipe casing (1) having a shoe (2) that opens and closes at its tip. A pipe (5) is installed, and a vertical slit (6) is formed in the outer casing (1) of the sand introduction pipe (5), and the sand introduction pipe (5).
The opening (7) is provided on both sides of the upper part of the casing (1) corresponding to the lower part of the sand hopper, and the support (1
3) is provided and a band-shaped bag (8) having water permeability and thermal adhesiveness wound on a large-diameter roll is mounted on the shaft, and the band-shaped bag (8) is introduced with sand through the slit (6). In order to form a cylindrical bag (9) by polymerizing and adhering both side edges (8a), (8b) of the tube (5) in a cylindrical shape around the tube (5), the slit portion (6) is formed. A heating and bonding device (11) having heating plates (11a) and (11b) is installed at an intermediate position.

In addition, in the openings provided on both sides of the upper part of the casing (1), a sand-filled bag (9) in which sand is filled and dropped from the sand introduction pipe (5).
The pair of rollers (12), (12) that guides (a) and the rotation of this one roller shaft (14) rotate the sandbag (9) into the casing (1).
Provide a detector (15) for detecting and recording the insertion depth of a) and the length of the sand-filled bag when the casing (1) is pulled up,
A vibro hammer (16) is connected to the upper part of the casing (1) and the sand hopper (3), and the casing (1) is moved up and down along a leader (not shown).

[Action] A roll-shaped strip-shaped bag material (8) is rolled into a cylindrical shape along the periphery of the sand introduction pipe (4) to guide it, and both side edges (8a),
(8b) are mutually melt-bonded (8c) by passing downward between the heating plates (11a) and (11b) of the heating adhesive device (11) provided in the vertical slit (6) of the casing (1). Since a bag-shaped body (9) is formed, the lower end of the bag is tied just below the sand introduction pipe (5) only at the beginning of construction or folded in two and closed, and a leader (not shown) is formed. ), And the casing (1) is driven into the soil by actuating the vibro hammer (16) that can be lifted up and down, and during this time the sand at the bottom of the sand hopper (4) Since the bag body (9) is filled with sand through the introduction pipe (5),
The weight of the sand-filled bag (9a) descends in the casing (1), and the sand-filled bag (9a) is guided by a pair of rollers (12) to the tip of the casing (1) closed by the shoe (2). Then, it is lowered and the insertion length of the sand-filled bag is detected and recorded by the rotation of one roller (12).

Thus, the casing (1) is driven into the soil by the operation of the vibro hammer (16), reaches a predetermined depth, and after confirming from the record of the detector (15), the casing (1) is pulled up along the reader. , The shoe (2) at the tip is opened and pulled out upward from the state shown in Fig. 5 (B) to the state shown in Fig. 5 (C), and the sand bag (9a) is left buried in the soil and the casing (1 ), The sand is continuously filled into the bag body (9) through the sand introduction pipe (5) of the sand hopper (4), so the bags of the rolls are increased as the casing (1) rises. The dough (8) is sequentially fed in a cylindrical shape around the sand introduction pipe (5), and both end edges (8a),
When (8b) are put together and heat-bonded (8c) by the heat-bonding device (11) to form a sand-filled bag, the casing (1) is exposed to the ground surface as shown in FIG. 5 (C). The sand-filled bag (9a) is continuously formed in the casing (1).

Therefore, the sand-filled bag (9a) is cut on the ground surface along the cutting line aa, and the lower end of the bag is pushed into the casing (1) as shown in FIG. ).

In this way, since the sand pillar body is continuously formed, the tubular bag body is formed, and the sand bag is continuously filled with sand, the work can be performed very efficiently.

Further, when the casing (1) is pulled up from the state of FIG. 5 (B), the rollers (12), (12) for guiding the sand-filled bag (9a) are rotated as the casing (1) moves upward, When the tip of the casing (1) is exposed to the ground as shown in Fig. 5 (C), the rotation of the roller (12) is detected by the detector (15), and the length of the bag (9) is detected according to the number of rotations. Is detected and recorded, the sand-filled bag (9
At the same time as knowing the manufacturing length of a), it can be confirmed that the casing (1) has been inserted all the way to the tip, and it is possible to immediately move to the next driving work without loss, so the sand pile construction work is wasteful and highly efficient. You can do it.

[Embodiment] The following will describe an embodiment of the present invention with reference to the drawings.
(1) is a casing made of steel pipe having an openable and closable shoe (2), and a sand hopper (4) is attached to the upper part of the casing via an appropriate supporting frame (3), and the sand hopper A sand introduction pipe (5) connected to the bottom is vertically provided in the upper part of the casing (1).

The casing (1) and the sand hopper (4) are connected to a vibro hammer (16) which is elevated and lowered along a leader (not shown).

A slit (6) is provided in the longitudinal direction on one side of the casing (1) around the sand introducing pipe (5). Further, below the sand introducing pipe (5), openings (7) and (7) are provided facing the casing (1). (8) is a belt-shaped bag made of a synthetic fiber having water permeability and thermal adhesiveness, which is wound into a large-diameter roll, and has a casing.
It is rotatably supported on a table (13) provided on one side of the upper part of (1), and is sequentially guided through the slit (6) of the casing (1) around the sand introduction pipe (5) in a cylindrical shape and pulled out. There is. Along with providing a suitable guide guide portion (10) around the sand introduction pipe (5) to guide the band-shaped bag material (8) to be rolled into a cylindrical shape around the sand introduction pipe (5) through the slit (6), Both sides 8a) and (8b) of the strip-shaped bag (8) are heat-bonded by incorporating heating plates (11a) and (11b) for welding in the slit part (6) in order to heat-bond the both edges together. Install the vessel (11).

(9) is a tubular bag formed from the band-shaped bag (8), receives the sand from the sand hopper (4) through the sand introduction pipe (5), the casing as a sand bag (9a) ( 1) It descends inside and is inserted.

(12) is a pair of rollers installed below the sand introducing pipe (5) so as to sandwich and guide the sand-filled bag body (9a) in the opening (7) of the casing (1). The shaft (14) is provided with a detector (15) that detects the amount of rotation of the shaft (14) and detects the length of the sand-filled bag (9a) and the rise with the casing (1). That is, while the sand-filled bag body (9a) descends and is inserted into the tip of the casing (1), the rollers (12) and (12) rotate and are detected by the detector (15), and the sand-filled bag body (9a) ) Is detected, and when the casing (1) is pulled up after driving the casing (1) to a predetermined depth, the sand-filled bag body (9a) is left in the ground, and only the casing (1) is The roller (12) rotates when it is pulled up, and the manufacturing length of the sand-filled bag body (9a) until the tip of the casing (1) is exposed to the ground is detected and confirmed.
When (1) and the sand-filled bag body (9a) driven into the ground go up together, the rollers (12), (12) do not rotate, so this is detected and inserted into the sand introduction pipe (5). Air Blown Tube (17)
Air is ejected from the surface to press the sand-filled bag body (9a) downward so that the casing (1) and the sand-filled bag body (9a) can be prevented from rising together.

EFFECTS OF THE INVENTION Since the present invention has the above-described configuration, the band-shaped bag material is rolled into a cylindrical shape when the casing is driven, and both end edges thereof are heat-welded to each other through the heat-bonding device to form a tubular bag body. At the same time, sand is filled from the sand introduction pipe of the sand hopper, and the sand-filled bag can be naturally inserted up to the tip of the casing, and the sand-filled bag for sand piles can be easily, easily and continuously formed. Since the sand-filled bag can be continuously formed even when the casing is pulled up after being driven to a predetermined depth, a bag of a desired length can be obtained from a belt-shaped bag material having a large diameter roll and processed as in the conventional method. The use of the bag, the attachment to the casing, the dropping operation for filling the sand, and the stopping operation are completely unnecessary, the bag for the sand pile can be inexpensively formed, and the bag cost can be significantly reduced.

Further, in the present invention, when the casing is driven in and when it is pulled up, since the sand-filled bag is always packed in the casing, the production of the sand-filled bag does not require any labor and time, and the soft ground is not required. There is a great advantage that the sand pillars can be continuously formed without waiting.

Furthermore, the sand-filled bag that is automatically formed in the casing is guided by the roller into the casing, and the detector can record and detect the depth of depression and the manufacturing length of the bag, and when the casing is pulled out, Since the sand bag is always clogged, it becomes a weight and it is easy to leave it buried in the ground,
It is possible to prevent the sand pile from rising together. Further, in the past, when the bag body was inserted into the sand pile casing, and when the bag was pulled up, the inside of the casing was pulled up empty, so it took time and time to prepare for the next sand pile driving construction, and the casing after driving In comparison with the case where the jet error is blown into the upper part of the inner sand bag to pressurize the sand bag to prevent the sand bag from rising together, the present invention can eliminate the troublesome operation and construction, and the sand-filled bag bends in the ground. It is possible to construct sand pillars that strengthen the soft ground continuously and accurately and cleanly, which is very efficient and can shorten the construction period with high efficiency. It is possible to provide a new sand pile construction method and device.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a sand pile forming apparatus showing an embodiment of the present invention, FIG. 2 is a sectional view of an AA part of FIG. 1, and FIG. 3 is a tube formed from a band-shaped bag material. FIG. 4 is a partial side view showing the formation state of the bag body, FIG. 4 is a plan view of the BB portion of FIG. 1, and FIG.
(A), (B), (C), (D) is explanatory drawing which shows the construction process of this invention. (1) casing, (2) shoe, (4) sand hopper, (5)
Is a sand introduction pipe, (6) is a slit portion, (7) is an opening portion, (8) is a roll-wound belt-shaped bag, (8a) and (8b) are both side edges, and (9) is a tubular bag. , (9a) is a sand-filled bag, (11) is a heat-bonding device, (12) is a roller, (14) is a roller shaft, (15) is a detector, (16) is a vibro hammer, and (17) is an air blower. Including tube.

Claims (3)

[Claims] 1. An outer circumference of a sand introduction pipe of a sand hopper provided directly above a casing connected to a vibro hammer,
A roll-shaped strip-shaped bag is guided into a cylindrical shape, and its both edges are bonded through a heat-bonding device to form a sand-filled bag, and the casing is submerged in the soil with a vibro hammer while filling the sand with a sand introduction tube. While driving, the sand-filled bag is guided by the roller installed on the upper part of the casing, and the submerged depth of the sand-filled bag to the tip of the casing is detected by the rotation of the roller, and after the casing reaches a predetermined depth, the casing And leave the sand-filled bag inside in the ground,
Even during the ascent, formation of sand-filled bags and sand filling are performed continuously,
When the tip of the casing is exposed on the ground surface, the sand-filled bag is cut under the casing, the upper bag end is pushed into the casing, and the casting of the casing is continued. 2. Immediately above a steel pipe casing with a tip opening / closing type,
Insert and install the sand introduction pipe of the sand hopper, and provide a vertical slit in the upper one side of the casing, and an opening facing the casing corresponding to the lower part of the sand introduction pipe, and roll winding on the side of the sand hopper. The belt-shaped bag of which is pivotally supported through a stand, and the guide portion which guides the belt-shaped bag by rolling it into a cylindrical shape around the sand introduction pipe through the slit portion, and the both side ends of the bag in the vertical slit portion. Providing a heating and bonding device that passes through and bonds
A pair of rollers for sandwiching and guiding the sand-filled bag filled with sand from the sand introduction pipe in the opening of the casing, and the depth of sinking of the sand-filled bag into the casing by the rotation of the roller shaft and the sand-filled bag. And a detector for detecting the manufacturing length, and a vibro hammer is further connected and installed on the upper part of the casing to enable driving. 3. The sand pile forming apparatus according to claim 2, wherein an air blowing pipe for feeding air from the outside is inserted and installed in the upper part of the casing through the sand hopper and the sand introducing pipe.