JPH08302686A - Cylindrical structure pressing device and driving method for cylindrical structure - Google Patents

Abstract

PURPOSE: To prevent generation of a large resistance to the inner surface of a cylindrical structure because of earth and sand which intrude into the structure when the structure is to be driven into the ground. CONSTITUTION: A cylindrical structure 1 is a little inserted into the ground (e) by pressure, and a pressing device 2 is installed in the structure 1. The device 2 is fixed to the structure 1 by extending out clamp cylinders 3... of the pressing device 2. In this condition, a pressing cylinder 4 is elongated downward, and a press is given to the surface of the ground (e) within the structure 1, and the structure 1 is pulled up. This prevents the earth and sand e' in the structure 1 from elevating along with the structure 1 when it is pulled up. Accordingly the earth and sand e' of the ground (e) is torn off from the structure 1 at its inner and outer surfaces so that the side face resistance decreases. At the stage the resistance has decreased, the structure 1 is again inserted by pressure, which allows the structure 1 to be inserted by pressure still deeper with decreased resistance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressing device for a cylindrical structure which presses an object to be pressed in a cylindrical structure and an object to be pressed in the cylindrical structure when the cylindrical structure is driven into the ground. ground)
The present invention relates to a method for driving a cylindrical structure that presses.

[0002]

2. Description of the Related Art Generally, as a method of driving a structure such as a pile or a sheet pile into the ground, hitting, vibration, or press-fitting is known. In driving the structure by the above-mentioned impact, the structure is driven into the ground with a large force by the impact against the tip resistance and the side resistance, but when the impact is repeated, large noise and vibration are generated. Occurs. When the structure is driven by the above-mentioned vibration, the structure is vibrated so that the tip resistance and the side surface resistance are reduced and the structure is driven into the ground. Noise is generated as well as generated.

Accordingly, the present applicant has already proposed a pile driving machine (press-in / pull-out machine) which takes a reaction force from a previously driven structure and press-fits another structure into the ground by hydraulic pressure. The press-in / pull-out machine is disposed on a clamp portion for gripping a structure already driven, and on the clamp portion,
It has a basic configuration including a main body having a power unit such as a hydraulic cylinder, a control device, and the like, and a vertically movable unit provided on the front surface of the main body and capable of moving up and down while holding a structure to be driven. The structure can be press-fitted or pulled out by the elevating part.

[0004] The above-mentioned clamp portion can grasp the already driven structure so as to take a reaction force from the already driven structure when driving the structure or pulling out the structure. It has become. The pile driving by the press-in / pull-out machine is very low in noise and vibration, unlike the pile driving by impact or vibration, and is environmentally friendly.

In the press-fitting / pulling-out machine,
When driving a structure into hard ground, to reduce the side resistance at the time of press-fitting of the structure, do not continuously press-fit the structure. To press-fit. In other words, during press-fitting, the earth and sand of the ground is pressed against and adheres to the side of the structure, and the side resistance is high. Can be reduced, and the load on the press-in / pull-out machine can be reduced.

[0006]

When a tubular structure such as a steel pipe is press-fitted, side resistance occurs on the outer surface of the steel pipe and side resistance also occurs on the inner surface of the tubular structure. Then, as shown in FIG. 5 (A), inside the tubular structure 1, when the tubular structure 1 is pressed into the ground e, the side surface resistance is surrounded by the cylindrical structure 1 in a state where the soil e ′ is surrounded by the tubular structure 1. Is caused, the state in which the earth and sand e ′ is pressed downward from the outer peripheral side, that is, the state in which the press-in / pull-out machine presses the earth and sand inside the cylindrical structure 1 together with the cylindrical structure 1 downward. A large press-fit is required to press-fit 1.

Accordingly, when the cylindrical structure 1 is press-fitted,
There is a problem that a heavy load is applied to the press-fitting / pulling-out machine and the life of the press-fitting / pulling-out machine is shortened.
In addition, it is possible to separate the outer surface of the tubular structure 1 and the earth and sand from the ground e by gradually press-fitting and withdrawing the tubular structure 1 into the ground as described above. However, inside the tubular structure 1, when the tubular structure 1 is pulled up, as shown in FIG. 5B, the earth and sand inside the tubular structure 1 are clogged in the tubular structure 1. It is highly likely that the tubular structure 1 will be pulled up together with the tubular structure 1.

In this case, when the tubular structure is press-fitted again, since the earth and sand are still attached to the inner surface of the tubular structure, it is desired to reduce the side surface resistance on the inner surface of the tubular structure. Absent.

The present invention has been made in view of the above circumstances, and reduces side surface resistance generated on the inner surface of a tubular structure when the tubular structure is gradually press-fitted into the ground while being repeatedly pressed and pulled out. An object of the present invention is to provide a pressing device for a tubular structure and a method for driving a tubular structure that can be performed.

[0010]

A pressing device for a cylindrical structure according to claim 1 of the present invention is arranged in a cylindrical structure and presses the inner surface of the cylindrical structure outward. And a fixing means provided on the fixing means and capable of pressing an object to be pressed along the axial direction of the cylindrical structure. Was used as a means for solving the above problems.

According to a second aspect of the present invention, there is provided a method for driving a cylindrical structure into which the cylindrical structure is driven into the ground by repeatedly driving and lifting the cylindrical structure. In the driving method, when driving the cylindrical structure after pulling up the cylindrical structure, during the step of pulling up the cylindrical structure from the stage before driving the cylindrical structure, the cylinder The object of the present invention is to press the ground surface in the cylindrical structure by a pressing portion movable along the axial direction of the cylindrical structure with respect to the cylindrical structure.

Further, in the method for driving a tubular structure according to a third aspect of the present invention, the pressing portion is arranged inside the tubular structure and the inner surface of the tubular structure is pressed outward. For a tubular structure comprising: fixing means capable of being fixed to the cylindrical structure by means of; and pressing means provided on the fixing means and capable of pressing an object to be pressed in the axial direction of the cylindrical structure. It is the tip of the pressing means in the pressing device, and in the state where the tubular structure pressing device is fixed in the tubular structure by the fixing means, the pressing portion is used to form the tubular structure by the pressing means. The movement of the object along the axial direction causes the ground surface in the tubular structure to be pressed by the pressing portion, which is a means for solving the above problems.

[0013]

According to the structure of the first aspect, the pressing device for the tubular structure is fixed in the tubular structure by pressing the inner surface of the tubular structure outward by the fixing means. State. Then, by operating the pressing means in a state where the pressing device is fixed in the tubular structure, the object to be pressed can be pressed and moved along the axial direction of the tubular structure.

Therefore, by using the above-described pressing device, when the tubular structure is pulled up in order to press-fit the tubular structure into the ground in a stepwise manner while repeating press-fitting and pulling-out, the ground in the tubular structure is lifted. The surface can be pressed downward, preventing the earth and sand in the tubular structure from being lifted together with the cylindrical structure, and reliably peeling off the inner surface of the tubular structure and the earth and sand, Side resistance can be reduced.

According to the above-mentioned structure of claim 2,
When pulling up a tubular structure to press-fit it into the ground step by step while repeatedly pressing and pulling the tubular structure,
To prevent the earth and sand in the tubular structure together with the tubular structure from being pulled up by pressing the ground surface in the tubular structure by the pressing portion, and to reliably peel off the inner surface of the tubular structure and the earth and sand. You can

Alternatively, when the tubular structure is pulled up in order to press it into the ground stepwise while repeating the press-fitting and pulling-out of the tubular structure, the inside of the tubular structure pulled up together with the tubular structure It is possible to press the earth and sand downward to drop the earth and sand from the inner surface of the tubular structure and to surely separate the earth and sand.
Therefore, at the time of press-fitting the tubular structure, the side resistance on the inner surface of the tubular structure can be reduced.

According to the third aspect of the present invention,
When the cylindrical structure is press-fitted, by using a pressing device having the same structure as the pressing device for a cylindrical structure according to claim 1, the inner surface of the cylindrical structure can be formed similarly to the structure according to claim 2. Lateral resistance at can be reduced.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a cylindrical structure pressing device and a method for driving a cylindrical structure according to an embodiment of the present invention. 1 to 3 show a pressing device 2 for a tubular structure according to this embodiment, and FIG. 4 shows steps of a method for driving the tubular structure 1 according to this embodiment. In the driving of the tubular structure 1 of this embodiment,
The above-described press-fitting / pulling-out machine (not shown) that presses in and pulls out the structure by taking a reaction force from the structure already driven is used.

As shown in FIGS. 1 to 3, the pressing device 2 for a tubular structure presses the inner surface of the tubular structure 1 outward in the tubular structure 1 (shown in FIG. 3). A clamp cylinder 3 for fixing the pressing device 2 to the tubular structure;
A pressing cylinder that presses an object to be pressed in the cylindrical structure 1 along the axial direction of the cylindrical structure 1 in a state where the pressing device 2 is fixed in the cylindrical structure 1 by the clamp cylinders 3. 4 (shown in FIGS. 2 and 3), a main body 5 supporting the clamp cylinders 3... And the pressing cylinder 4, and a pipe 6 connected to the main body 5 and supplying hydraulic pressure, electric power, signals, and the like.
(Shown in FIG. 3), and a control unit (not shown) that is provided in the main body unit 5 and controls the clamp cylinders 3...

The clamp cylinders 3 are composed of a contact plate 3a, which contacts the inner surface of the tubular structure 3, and a cylinder portion 3b.
And a piston (not shown) whose tip is connected to the contact plate 3a. The clamp cylinders 3 are connected to the main body 5 in a state of extending radially along a radial direction of a circle centered on the center of the main body 5, and the adjacent clamp cylinders 3 form one another. The angles are equal. In this embodiment, three clamp cylinders 3 are arranged every 120 degrees.

The contact plate 3a is formed in an arc shape, and the outer surface of the contact plate 3a can come into contact with the inner surface of the cylindrical structure 1 as a surface. Clamp cylinder 3 having such a configuration
.., As shown in FIG. 3, in a state where the pressing device 2 is arranged in the tubular structure 1 and a piston (not shown) is extended by hydraulic pressure, so that the three contact plates 3 a
It is configured to be in contact with the inner surface of the tubular structure 1. Then, by pressing the contact plate 3a against the inner surface of the tubular structure 1 by hydraulic pressure, a large frictional force is generated between the outer surface of the contact plate 3a and the inner surface of the tubular structure 1, and the pressing device 2 causes the tubular structure 1 to move. It is supposed to be fixed to.

The pressing cylinder 4 is a disk-shaped pressing portion 4
a, a cylinder part 4b, and a piston part 4c whose tip is connected to the pressing part 3a. When the pressing device 2 is fixed to the tubular structure 1 by the clamp cylinders 3 in a state where the tubular structure 1 is set up vertically and the clamp cylinders 3 are kept horizontal, It is connected to the lower surface of the main body 5 so as to extend from the part 5 along the vertical direction.

With the above-described structure, the pressing device 2 of this embodiment has the cylindrical structure 1 with the clamp cylinders 3 ...
In the state fixed inside, that is, in the state where the reaction force is taken from the tubular structure 1, the pressing portion 4a of the pressing cylinder 4
An object to be pressed (not shown) in the tubular structure 1 can be moved by being pressed along the axial direction of the tubular structure 1.

Next, a method of driving the cylindrical structure 1 using the above-mentioned pressing device 2 will be described. In the method for driving the tubular structure 1 of this embodiment, in the state where the tubular structure 1 is gripped by the elevating part (not shown) of the press-fitting / withdrawing machine,
The cylindrical structure 1 is press-fitted by lowering the elevating part,
Next, by raising the elevating part by a distance shorter than the lowered distance, the tubular structure 1 is pulled up without being completely pulled out, and the elevating part is lowered again for a longer period than the raised distance. Further press-fitting of the structure is repeated.

That is, the tubular structure 1 is driven in a stepwise manner while the press-in and pull-out of the tubular structure 1 are repeated. When repeating the driving and lifting of the tubular structure 1, the following processing is performed together with the vertical movement of the elevating unit. First, when the tubular structure 1 is first press-fitted, as shown in FIG. 4A, the pressing device 2 is inserted into the tubular structure 1 with the pressing portion 4a facing downward.

At this time, the clamp cylinder 3... And the pressing cylinder 4 are contracted, and the pressing device 2 is placed on the surface of the ground e in the tubular structure 1 with the pressing portion 4a down. I do. Next, before the tubular structure 1 is pulled up, the clamp cylinders 3 are extended by hydraulic pressure, and the outer surfaces of the contact plates 3a are brought into contact with the inner surface of the tubular structure 1 to be pressed.

That is, the pressing device 2 is fixed to the tubular structure 1 by the clamp cylinder 3. Next, when pulling up the tubular structure 1, the pressing portion 4a of the pressing cylinder 4 is pressed against the surface of the ground e in the tubular structure 1 by hydraulic pressure. Then, as the tubular structure 1 is pulled up and rises, as shown in FIG. 4 (B), the pressing device 2 fixed in the tubular structure 1 ascends. As long as the stroke permits, the pressing portion 4a extends downward and remains pressed against the surface of the ground e in the tubular structure 2.

At this time, the earth and sand e'in the tubular structure 2 tries to rise together with the tubular structure 1 by pulling up the tubular structure 1 as described above. Since the surface of the ground e in the cylindrical structure 1 is pressed downward along the axial direction of the cylindrical structure 1 by the pressing portion 4a of the pressing cylinder 4 that has applied the reaction force, the inside of the cylindrical structure 1 The earth and sand e'is peeled off from the inner surface of the tubular structure 1 and remains in the ground e as it is.

Therefore, also on the inner surface of the tubular structure 1,
As with the outer surface, the earth and sand e ′ of the ground e are in a peeled-off state. Next, the tubular structure 1 is pressed again deeper than the previous time. At this time, the clamp cylinders 3 are contracted to release the fixation of the pressing device 2 to the tubular structure 1, and
The pressing cylinder 4 is expanded and contracted to pull up the tubular structure 1 and the raised pressing device 2 (the main body 5 and the clamp cylinder 3...) Is lowered, as shown in FIG. The state is the same as that at the time of press-fitting of the tubular structure 2.

When the tubular structure 1 is press-fitted again, the earth and sand are peeled off from the tubular structure 1 on both the inner surface and the outer surface of the tubular structure 1. Side resistance is reduced on both the inner surface and the outer surface of the tubular structure 1, and press-fitting for press-fitting the tubular structure 1 into the ground e can be reduced.

Then, the lifting and press-fitting are repeated until the tubular structure 2 is again press-fitted to a predetermined depth, and the pressing device 2 is fixed to the tubular structure 1 and the surface of the ground e is pressed. Such cancellation is repeatedly performed.
It should be noted that the pulling and press-fitting of the cylindrical structure by the press-fitting / pulling-out machine, the fixing of the pressing device 2 to the cylindrical structure, the pressing of the surface of the ground e and the release thereof are interlocked by the control unit not shown above. Controlled.

As described above, according to the cylindrical structure pressing device 2 of this embodiment and the method of driving the cylindrical structure 1 using the same, when the cylindrical structure 1 is driven, press-fitting and lifting are performed. Is repeated, not only the side surface resistance on the outer surface side of the tubular structure 1 but also the side surface resistance on the inner surface side can be reduced, so that the press-in force at the time of driving the tubular structure 1 can be reduced. it can.

Therefore, the load on the press-in / pull-out machine can be reduced, and the cost can be reduced by extending the life of the press-in / pull-out machine. Further, as described above, the pressing device 2 is placed on the surface of the ground e in the tubular structure 2 each time the press fitting is performed, so that the pressing cylinder 4 is adjusted according to the length of the tubular structure 1. It is not necessary to lengthen the stroke of and can be manufactured at low cost.

In the above embodiment, the pressing device 2
Although the three clamp cylinders 3 are provided in the above, the number of the clamp cylinders 3 may be any number as long as the pressing device 2 can be fixed to the tubular structure 1 by the clamp cylinders 3, and the number is not particularly limited as long as it is two or more. is not. Further, although the clamp cylinder 3 is the fixing means of the pressing device for a tubular structure of the present invention, the fixing device fixes the pressing device to the tubular structure by pressing the inner surface of the tubular structure to the outside. Any structure may be used as long as it is possible, and for example, an annular shape that can expand the diameter may be used.

That is, by arranging the expandable annular member in the cylindrical structure 1 in a contracted state and then expanding the annular member, the annular member expands the inner surface of the cylindrical structure 1 to the outside. It is possible to fix the pressing device 2 to the tubular structure 1 by pressing. The pressing cylinder 4 serving as the pressing means of the present invention does not need to be particularly one, but may be plural.

In the above embodiment, the clamp cylinder 3 serving as the fixing means and the pressing cylinder 4 serving as the pressing means are operated by hydraulic pressure. However, if the necessary pressing force can be satisfied, other than hydraulic pressure can be used. Using water pressure,
It is also possible to use an electromagnetic force or other driving force of a motor or the like. In the above embodiment,
Although the pressing device 2 is used for driving the tubular structure 1 into the ground, the pressing device 2 can be effectively used for other purposes.

For example, in the above-mentioned embodiment, the cylindrical structure 1 is pulled up by using the press-fitting / pulling-out machine, but if the pressing cylinder 4 has a sufficient pressing force, it is clamped as described above. With the pressing device 2 fixed to the tubular structure 1 by the cylinders 3, ...
By using a press-in / pull-out machine,
The tubular structure 1 can be pulled up. That is, the pressing device 2 can be used as a pulling machine for the tubular structure 1.

Further, if the pressing device 2 is arranged in a sewer pipe in which the discharged soil is accumulated, the discharging device can be pressed and moved by the pressing means. It can be used as a soil device, a clogging removing device, and the like. In this case, the tubular structure 1 does not need to be vertical, and the pressing device 2 can be used even when the tubular structure 1 is set at an angle other than vertical, for example, horizontal.

In the method for driving the tubular structure 1 of the above embodiment, the pressing device 2 is used for driving the tubular structure 1, but the pressing device 2 having the above configuration is not necessarily used. There is no necessity. When the tubular structure 1 is pulled up, the sediment in the tubular structure 1 is removed.
What is necessary is just to have the press part which moves along the axial direction of this and presses.

In the method for driving the tubular structure 1 of the above embodiment, the lifting of the tubular structure 1
Although the surface of the ground e in the tubular structure 1 is pressed downward by the pressing device 2, in the present invention, the tubular structure 1 is pressed at the time of the previous press-fitting until the tubular structure 1 is press-fitted again. 1
It is only necessary to be able to peel off the earth and sand attached to the inner surface,
For example, by pulling up the tubular structure 1, the soil in the tubular structure 1 may be pulled down after the soil in the tubular structure 1 is lifted, and then may be pressed downward to drop.

When the tubular structure 1 is driven and pulled up, it is not always necessary to use the above-described press-in / pull-out machine, and another pile driving machine or pull-out machine may be used. Also in this case, when driving the tubular structure 1, the side resistance in the tubular structure 1 can be reduced, and the efficiency of the driving of the tubular structure 1 can be improved. The tubular structure 1 may be any structure as long as it is a tubular structure made of a steel pipe, a concrete structure, or the like.

The sectional shape of the tubular structure 1 is not limited to the circular shape, but may be a square shape or other shapes.
When the cross-sectional shape of the tubular structure 1 is a shape other than a circle, the shape of the pressing portion 4a of the pressing cylinder 4 is also a shape other than the disc shape corresponding to the cross-sectional shape of the cylindrical structure 1. Is preferred.

[0043]

According to the pressing device for a tubular structure according to the first aspect of the present invention, the pressing device is fixed to the tubular structure by the fixing means, and the reaction force is removed from the tubular structure. By the pressing means, the pressed object in the cylindrical structure can be efficiently pressed and moved. Further, in order to press-fit the tubular structure into the ground stepwise while repeating press-fitting and pulling-out, by using the pressing device, when pulling up the tubular structure, the surface of the ground in the tubular structure is raised. Can be pressed downward, preventing the earth and sand in the tubular structure from being pulled up together with the tubular structure, reliably peeling off the inner surface of the tubular structure and the earth and sand, Lateral resistance can be reduced. Therefore, if the pressing device is used for driving a cylindrical structure, the force required for driving the cylindrical structure is reduced, and the efficiency of driving the cylindrical structure is improved.
Cost reduction can be achieved.

According to the method for driving a tubular structure according to the second aspect of the present invention, as in the case of using the pressing device according to the first aspect, the tubular structure is repeatedly pressed into and pulled out. When the tubular structure is pulled up in order to press it into the ground in a stepwise manner, the surface of the ground in the tubular structure is pressed downward, so that the side resistance on the inner surface of the tubular structure can be reduced.

According to the method for driving a tubular structure according to the third aspect, when driving the tubular structure,
By using a pressing device having the same configuration as the pressing device for a cylindrical structure according to the first aspect, the driving method for the cylindrical structure can be performed similarly to the method for driving the cylindrical structure according to the second aspect. In addition, the side resistance on the inner surface of the tubular structure can be reduced, and the efficiency of the driving of the tubular structure and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view showing a pressing device for a tubular structure according to one embodiment of the present invention.

FIG. 2 is a side view showing the cylindrical structure pressing device according to the embodiment.

FIG. 3 is a side view of the pressing device disposed in the tubular structure of the embodiment.

FIG. 4 is a side view showing the pressing device in the tubular structure for explaining the steps of the method for driving the tubular structure of the embodiment.

FIG. 5 is a cross-sectional view for explaining a conventional method of driving a tubular structure.

[Explanation of symbols]

 1 Cylindrical Structure 2 Cylindrical Structure Pressing Device 3 Clamp Cylinder (Fixing Means) 4 Pressing Cylinder (Pressing Means) 4a Pressing Part e Ground e'Soil and Sand of Ground in Cylindrical Structure

Claims (3)

[Claims] 1. A fixing means which is disposed in a tubular structure and which can be fixed to the tubular structure by pressing the inner surface of the tubular structure outward, and the fixing means. Further, the tubular structure pressing device is characterized by comprising a pressing means capable of pressing an object to be pressed along the axial direction of the cylindrical structure. 2. A method for driving a tubular structure in which the tubular structure is driven into the ground by repeating the driving and the pulling up of the tubular structure. When driving the tubular structure, from the stage of pulling up the tubular structure to the stage before driving the tubular structure, the ground surface in the tubular structure is moved in the axial direction of the tubular structure. A method for driving a tubular structure, characterized in that the tubular structure is pressed by a pressing portion that is movable along the tubular structure. 3. The fixing means is disposed within the tubular structure, and can be fixed to the tubular structure by pressing an inner surface of the tubular structure outward, and the fixing means. And a pressing means capable of pressing the object to be pressed in the axial direction of the tubular structure. By moving the pressing portion along the axial direction of the cylindrical structure by the pressing means in a state in which the pressing device for a cylindrical structure is fixed in the cylindrical structure, The method for driving a cylindrical structure according to claim 2, wherein the ground surface is pressed by the pressing portion.