JP7383472B2 - Casing band and all-casing method using it - Google Patents

Description

The present invention relates to a casing band for preventing a casing from falling, and an all-casing construction method using this casing band.

In the all-casing method, which uses casings to drill holes in the ground, the casings are sequentially connected according to the drilling depth, and after drilling to the target depth, concrete is poured into the drilled hole and the casing is removed. Recovery, etc. are performed (for example, see Patent Document 1). In such an all-casing construction method, a casing band 100 as shown in FIG. 7, for example, may be used when recovering connected casings. This casing band 100 fixes the casing 80 connected one level below the casing 80 to be recovered, and the fixed casing 80 and all the casings 80 connected beyond it are connected to the drilled hole. This is to support it so that it does not fall. In the example shown in FIG. 7, the casing band 100 has an annular shape with a size corresponding to the outer periphery of the casing 80, and four notches 102 are provided at the inner periphery thereof at equal intervals. A wedge is driven into each of the notches 102 between the inner circumference of the casing band 100 and the outer circumference of the casing 80, thereby fixing and supporting the casing 80. Note that in FIG. 7, a part of the casing band 100 is shown transparently.

Japanese Patent Application Publication No. 2006-083573

Here, since the conventional casing band 100 shown in FIG. 7 has a predetermined thickness over its entire circumference in order to ensure the necessary strength, for example, the conventional casing band 100 shown in FIG. If the casing 80 is located next to a structure 90 such as this (the hole drilled in the casing 80 is located next to the structure 90), the casing band 100 cannot be installed around the casing 80, and the casing band 100 cannot be installed around the casing 80. I couldn't support 80. Further, in the conventional casing band 100, a wedge was driven between the inner circumferential surface of the casing band 100 and the outer circumferential surface of the casing 80 to support the casing 80, so it took time and effort to drive in and remove the wedge. .
The present invention has been made in view of the above problems, and an object of the present invention is to easily recover a casing from a structure.

(Aspects of the invention)
The following embodiments of the invention are intended to exemplify the configuration of the present invention, and will be explained separately in order to facilitate understanding of the various configurations of the present invention. Each section does not limit the technical scope of the present invention, and some of the constituent elements of each section may be replaced, deleted, or further modified while taking into consideration the best mode for carrying out the invention. Components to which the above components are added may also be included within the technical scope of the present invention.

(1) A casing band that is used to prevent the casing from falling into the hole at the opening edge of a hole drilled in the ground using the casing, and is pressed against the outer periphery of the casing. It has two clamping parts having pressure contact surfaces and a casing placement part through which the casing is inserted, and the two clamping parts are positioned so that the pressure contact surfaces face each other across the casing placement part in a plan view. and a drive section that is housed in the main body and drives the two clamping sections toward and away from each other. The opening portion is configured such that the placement portion is exposed, and the two clamping portions are located at a position where the casing protrudes from the opening portion of the casing placement portion and from the opening portion of the two clamping portions in a plan view. A casing band that supports the casing at a position where the portion does not protrude (claim 1).

The casing band described in this section includes two clamping parts, a main body part, and a driving part, and the two clamping parts are parts that substantially support the casing and have a pressure contact surface that is pressed against the outer periphery of the casing. have. The main body has a casing arrangement part through which the casing is inserted, and also positions and holds the two clamping parts. At this time, the pressure contact surfaces of the two clamping parts are sandwiched between the casing arrangement part in plan view. Hold them so that they are facing each other. That is, when the casing is inserted into the casing placement part, the pressure contact surfaces of the two clamping parts face each other with the casing interposed therebetween. Further, the main body portion has an opening portion configured to expose the casing placement portion when viewed from the front, and this opening portion communicates with the casing placement portion. The drive unit drives the two clamping parts in directions toward and away from each other, and is housed in the main body holding the two clamping parts.

When the two holding parts are driven by the driving part in a direction approaching each other with the casing inserted into the casing arrangement part, the two holding parts are at a position where the casing protrudes from the opening part of the casing arrangement part in plan view . In addition, the casing is held and supported at a position where the two holding parts do not protrude from the opening of the casing placement part . In other words, the casing band with the casing supported by the two clamping parts does not protrude beyond the casing in the direction from the casing arrangement part to the opening thereof in a plan view. Therefore, even if the hole drilled by the casing is close to the structure and there is a casing next to the structure, the casing band can be installed with the opening of the casing placement facing the structure. , the casing is supported by the two clamping parts without being interfered with by the structure.

Furthermore, since the casing band described in this section has a configuration in which two clamping parts are driven by a driving part, unlike conventional casing bands, it is not necessary to drive in or remove a wedge when fixing and releasing the casing. There is no. Therefore, the working time and effort are significantly reduced, and the work of recovering the casing, which involves fixing the casing, becomes easier. In addition, since there is no impact sound when the wedge is driven in or removed, it also contributes to noise reduction. Furthermore, there is no need for workers to enter narrow spaces that may be blind spots, such as between the structure and the casing, and safety is improved. Furthermore, the casing band described in this section can be installed in advance around the casing protruding from the drilled hole if the opening width of the opening of the casing placement part is larger than the diameter of the casing. Even if the casing is not provided, the casing can be easily installed at the required timing so that the casing can be placed in the casing placement part through the opening.

(2) In the above item (1), the casing band includes a removable spacer on the pressure contact surfaces of the two holding parts (Claim 2).
The casing band described in this section includes a removable spacer on the pressure contact surfaces of the two clamping parts, so that it can also be used with casings having a smaller diameter. That is, a spacer having a second press-contact surface that will be press-contacted to the outer periphery of the casing in the same way as this press-contact surface is attached to the press-contact surfaces of the two clamping parts held so as to face each other by the main body. As a result, the positions of the surfaces pressed against the outer periphery of the casing are offset in the direction in which the two clamping parts approach each other. As a result, casings with different diameters are clamped before and after the spacer is attached to the two clamping parts, so it is possible to accommodate casings of various diameters depending on the thickness of the spacer and the stroke length of the clamping parts. Become something.

(3) In the above items (1) and (2), the auxiliary pressure contact portion further includes an auxiliary pressure contact portion having a pressure contact surface that is pressed against the outer periphery of the casing, and an auxiliary drive portion that drives the auxiliary pressure contact portion; (Claim 3) The casing band is installed on the main body part so as to be pressed against the outer periphery of the casing from a position facing the opening part of the casing placement part in plan view.
The casing band described in this section further includes an auxiliary pressure contact part and an auxiliary drive part. Like the two clamping parts, the auxiliary pressure contact part has a pressure contact surface that is pressed against the outer periphery of the casing, and the auxiliary pressure contact part has a pressure contact surface that is pressed against the outer periphery of the casing. It is installed in the main body so as to be pressed against the outer periphery.

On the other hand, the auxiliary drive section drives the auxiliary pressure contact section in directions toward and away from the casing. Therefore, the cylindrical casing inserted into the casing arrangement part is pressed in the direction toward the opening of the casing arrangement part by the auxiliary pressure contact part, and is held by the two clamping parts from two opposing directions different from that direction. It will be done. As a result, the position of the casing band is finely adjusted so that the direction of the force applied from the three parts, the two clamping parts and the auxiliary pressure contact part, is directed toward the axis of the casing in plan view. The casing will be supported more stably. Note that when a spacer as described in item (2) above is attached to the two clamping parts, it is preferable that a spacer of an appropriate size is also attached to the auxiliary pressure contact part.

(4) In items (1) to (3) above, the drive unit is powered by hydraulic pressure, and the drive unit is supplied with hydraulic pressure from a drilling machine that holds the casing and drills the hole. A casing band comprising a hydraulic circuit (claim 4).
In the casing band described in this section, the drive section that drives the two clamping sections is powered by hydraulic pressure, and the drive section that drives the two clamping sections is connected to a drilling machine that holds the casing and drills the hole. , a hydraulic circuit to which hydraulic pressure is supplied. As a result, there is no need to prepare a separate power source for the drive unit, and hydraulic pressure is supplied as power from the drilling machine that is also used when recovering casings, so casing recovery work can be carried out efficiently. Therefore, the device configuration becomes compact. In addition, when the auxiliary drive unit as described in the above item (3) is provided, it is preferable that hydraulic pressure is also supplied as motive power from the drilling machine to the auxiliary drive unit via the hydraulic circuit.

(5) When holding the casing with a drilling machine and drilling a hole in the ground, and then recovering the casing, use the casing band described in any one of the above (1) to (4). All casing construction method (Claim 5).
The all-casing construction method described in this section applies the methods described in (1) to (4) above when adding casing, holding the casing with a drilling machine, drilling holes in the ground, and then recovering the added casing. The casing band according to any one of the above is used. That is, the casing connected to the last casing is fixed by a casing band, and the last casing is removed and recovered during that time. Thereby, even if the casing is near a structure, the casing can be easily recovered while being supported by the two holding parts driven by the drive part.

Since the present invention has the above-described configuration, it is possible to easily recover the casing from the structure.

FIG. 3 is a three-sided view showing the casing band according to the embodiment of the present invention, showing a state in which the casing is sandwiched. FIG. 2 is a plan view showing the casing band of FIG. 1 in a state where the casing is not clamped. FIG. 2 is a plan view showing a state in which a spacer is attached to the casing band of FIG. 1 and a casing having a smaller diameter than the casing of FIG. 1 is sandwiched therebetween. It is an example of the hydraulic circuit for supplying hydraulic pressure from a drilling machine to the drive part which uses hydraulic pressure as a drive source of the casing band based on embodiment of this invention. FIG. 2 is a side view showing an example of a hole drilling machine that uses a casing to drill a hole in an all-casing construction method using a casing band according to an embodiment of the present invention. It is a top view which shows the procedure at the time of utilizing the casing band based on embodiment of this invention in the all-casing construction method. It is a top view and a front view which show a conventional casing band.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described based on the accompanying drawings. Here, detailed explanations of the same or corresponding parts as in the prior art will be omitted, and the same or corresponding parts are indicated by the same reference numerals throughout the drawings.
1 and 2 show an example of the configuration of a casing band 10 according to an embodiment of the present invention, which is used to support a cylindrical casing 80 in an all-casing method or the like. 1 and 2, a part of the internal structure of the casing band 10 is transparently illustrated, and the casing 80 is illustrated with a two-dot chain line. As illustrated, the casing band 10 according to the embodiment of the present invention includes two clamping parts 12, a main body part 20, a driving part 30, an auxiliary pressure contact part 40, an auxiliary driving part 44, and a hydraulic circuit 56. .

The main body 20 forms the housing of the casing band 10 and accommodates other components of the casing band 10. Specifically, the main body section 20 movably holds the two clamping sections 12 and the auxiliary pressure contact section 40 as described later, and also accommodates the drive section 30, the auxiliary drive section 44, and the hydraulic circuit 56. . Further, the main body portion 20 is provided with a casing placement portion 22 into which the casing 80 is inserted and placed when supporting the casing 80. In this embodiment, the casing placement portion 22 is ) and as shown in FIG. 2, it has a U-shape in plan view. That is, the casing placement part 22 has a cutout-like opening portion so as to be exposed in a front view from above in FIGS. 1(a) and 2 (rear view when FIG. 1(b) is a front view). 24 is formed.

When supporting the casing 80, the two clamping parts 12 are driven by the driving part 30 as described later, and clamp and fix the casing 80. For this purpose, the two clamping parts 12 have pressing surfaces 12a that are arcuate in plan view and are pressed against the outer periphery of the casing 80, and the pressing surfaces 12a face each other with the casing placement part 22 in between in plan view. It is positioned and held by the main body part 20 as shown in FIG. Further, as can be seen in FIG. 1(a), the two holding parts 12 support the casing 80 at a position where the casing 80 protrudes from the opening part 24 of the casing placement part 22 in plan view. .

The auxiliary pressure welding part 40 is an auxiliary pressure welding part 40 for so-called centering so that when the casing band 10 supports the casing 80, the two clamping parts 12 accurately capture the axis 80a of the casing 80 and sandwich the casing 80. It is pressed into contact with the casing 80 at the same time. For this purpose, the auxiliary pressure contact portion 40 has a pressure contact surface 40a that is arcuate in plan view and is pressed against the outer periphery of the casing 80, and in this embodiment, the pressure contact surface 40a is applied to the casing from the side opposite to the opening portion 24. It is positioned and held by the main body part 20 so as to face the placement part 22 . The auxiliary pressure contact section 40 is driven by an auxiliary drive section 44 as described later.

The drive section 30 drives the two clamping sections 12 in directions toward and away from each other, and includes two hydraulic cylinders 32 and 34 in this embodiment. The cylinder 32 drives one of the clamping parts 12 located on the left side in the left-right direction in FIGS. The clamping parts 12 are driven (the state shown in FIG. 1), and when the fixation of the casing 80 is released, one of the clamping parts 12 is driven toward the left (the state shown in FIG. 2). Further, the cylinder 34 is for driving the other clamping part 12 located on the right side in the left-right direction in FIGS. 1(a) and 2, and when fixing the casing 80, it The other clamping part 12 is driven (the state shown in FIG. 1), and when the fixation of the casing 80 is released, the other clamping part 12 is driven rightward (the state shown in FIG. 2).

The auxiliary drive section 44 drives the auxiliary pressure welding section 40 in the direction toward and away from the casing 80 arranged in the casing arrangement section 22, and includes a hydraulic cylinder 46 in this embodiment. There is. The cylinder 46 drives the auxiliary pressure welding part 40 upward when fixing the casing 80 in the vertical direction in FIGS. 1(a), (c) and FIG. At the time of release, the auxiliary pressure contact portion 40 is driven downward (the state shown in FIG. 2).
On the other hand, the hydraulic circuit 56 is connected to the two cylinders 32 and 34 of the drive unit 30 as described above and the cylinder 46 of the auxiliary drive unit 44 from a hole drilling machine 70 (see FIGS. 5 and 6), which will be described later. , for supplying hydraulic pressure. Details of this hydraulic circuit 56 will be described later.

Next, FIG. 3 shows a state in which a removable spacer 50 is attached to the two holding parts 12 and the auxiliary pressure contact part 40. Each of these three spacers 50 has a second pressure contact surface 50a that is arcuate in plan view, and a mounting surface 50b that is also arcuate in planar view, with a predetermined thickness between them. There is. Each of the spacers 50 has its mounting surface 50b removably attached to the pressure contact surface 12a of the clamping part 12 or the pressure contact surface 40a of the auxiliary pressure contact part 40, so that The second pressure contact surface 50a is arranged at a position close to the axis 80a of the casing 80. Note that any detachable method can be used to attach the spacer 50 to the holding part 12 and the auxiliary pressure contact part 40.

Therefore, when the two clamping parts 12 and the auxiliary pressure contact part 40 are driven by the drive part 30 and the auxiliary drive part 44 in order to fix the casing 80, each spacer is attached to the outer periphery of the casing 80, as shown in FIG. 50 second press-contact surfaces 50a are press-contacted. Here, the casing 80 shown in FIG. 3 has a smaller diameter than the casing 80 shown in FIGS. 1 and 2, but because the spacer 50 is used, the two holding parts 12 and The auxiliary pressure contact portion 40 fixes and unfixes the casing 80 with approximately the same stroke length as those shown in FIGS. 1 and 2. Furthermore, even if the casing 80 in FIG. 3 has a reduced diameter, it is fixed at a position where it protrudes from the opening portion 24 of the casing arrangement portion 22.

Subsequently, FIG. 4 shows the configuration of the hydraulic circuit 56 for supplying hydraulic pressure from the drilling machine 70 to the cylinders 32 and 34 of the drive unit 30 and the cylinder 46 of the auxiliary drive unit 44, as described above. An example is shown. However, the hydraulic circuit 56 is not limited to the circuit configuration shown in FIG. 4. In the embodiment of FIG. 4, a hydraulic circuit 56 is interposed between a directional control valve 72 provided in the drilling machine 70 and three cylinders 32, 34, and 46. Hydraulic circuit 56 generally includes two flow control valves 58, 60, two check valves 62, 64, and a hydraulic relief valve 66. Specifically, a hydraulic relief valve 66, a check valve 62, and a flow rate control valve 58 are arranged between the direction control valve 72 and the cylinder 32.

Further, a hydraulic relief valve 66, a check valve 62, and a flow control valve 60 are arranged between the directional control valve 72 and the cylinder 34, and a check valve 64 is arranged between the directional control valve 72 and the cylinder 46. ing. With such a configuration, the three cylinders 32, 34, and 46 are driven simultaneously by switching the direction control valve 72 of the hole drilling machine 70. The physical connection between the directional control valve 72 of the drilling machine 70 and the hydraulic circuit 56 can be achieved, for example, by using a connector (not shown) provided near the hydraulic circuit 56 in the main body 20 shown in FIGS. 1 to 3. This is realized through Further, the casing band 10 may be configured to be detachable from the hole drilling machine 70, and hydraulic pressure may be supplied through the connecting portion thereof.

Here, the casing band 10 according to the embodiment of the present invention is not limited to the configuration shown in FIGS. 1 to 4, and some of the plurality of structural parts shown in FIGS. It may be deleted or replaced, or a new component may be added. For example, as long as the casing placement part 22 in which the casing 80 is placed so as to protrude from the opening part 24 is formed, the shape of the main body part 20 is arbitrary, and the upper right part of the main body part 20 in FIG. It may have a shape in which the upper left portion is hollowed out, or it may extend to the lower right portion or the lower left portion to form a U-shape in plan view. Furthermore, the shape of the casing placement part 22 is also arbitrary, and is not limited to a U-shape in plan view. Further, the power source of the drive section 30 and the auxiliary drive section 44 may be electricity, and in this case, an electric mechanism capable of generating the necessary and sufficient force to support the casing 80 is used as the power source for the drive section 30 and the auxiliary drive section 44. It is used for the drive section 44.

Next, with reference to FIGS. 5 and 6, regarding the all-casing construction method according to the embodiment of the present invention that utilizes the casing band 10 according to the embodiment of the present invention described above, the drilling position is set to the structure 90. An example of a case where they are close together will be explained. For the detailed configuration of the casing band 10, please refer to FIGS. 1 to 4 as appropriate. In the all-casing construction method, for example, a hole drilling machine 70 (70A, 70B) as shown in FIG. 5 is used to drill holes in the ground 82, collect the casing 80, etc. The hole drilling machine 70A shown in FIG. 5(a) utilizes a hydraulic multi-functional large-diameter drilling machine (so-called BG machine), and is used especially when performing construction in places where there is no height restriction. Ru. On the other hand, the drilling machine 70B shown in FIG. 5(b) is a BG machine that is compatible with low-head environments and is used when performing construction in locations with height restrictions such as structures 90 existing above. be.

Here, the all-casing construction method according to the embodiment of the present invention includes content that is similar to the conventional all-casing construction method, but the explanation of such similar content will be simplified or omitted. do. First, as shown in FIG. 6A, in this embodiment, a hole is drilled at a designed position in the ground 82 close to a structure 90 using a casing 80 by a hole-drilling machine 70. Specifically, the construction of the casing 80, the excavation and waste soil inside the casing 80, and the addition of the casing 80 are repeated until the hole is drilled to the design depth. Once the hole has been drilled to the design depth, and after performing predetermined measures according to the purpose of construction, the edge of the opening of the hole drilled in the ground 82, i.e. around the casing 80, is removed as shown in FIG. 6(b). , the casing band 10 is installed. At this time, the casing band 10 is installed so that the casing band 10 is placed in the casing placement part 22 with the opening portion 24 of the casing placement part 22 facing the structure 90.

Next, as shown in FIG. 6(c), the drilling machine 70 is moved to a position where it can hold the last casing 80, and the drilling machine 70 is moved so that hydraulic pressure is supplied from the drilling machine 70. 70 and the hydraulic circuit 56 of the casing band 10 are connected. Then, the last casing 80 is held by the hole drilling machine 70 and a predetermined length is set so that the casing 80 connected to the last casing 80 is placed in the casing placement part 22 of the casing band 10. Then, the casing 80 is pulled out. Thereafter, the cylinders 32 , 34 , 46 are actuated via the hydraulic circuit 56 by the hydraulic pressure supply operation from the hole drilling machine 70 , and the two clamping parts 12 and the auxiliary pressure contact part 40 are connected to the rearmost casing 80 . It is pressed against the outer periphery of the casing 80 and fixes the casing 80 (see FIG. 1). In this state, the last casing 80 is removed from the casing 80 supported by the casing band 10, and the removed casing 80 is recovered.

Furthermore, as the casing 80 is recovered as described above, the casing 80, which is currently the last casing 80 supported by the casing band 10, is held by the hole drilling machine 70 and then drilled. The fixation by the casing band 10 is released by operation from the machine 70 (see FIG. 2). From now on, such holding and unfixing of the rearmost casing 80, pulling out a predetermined length of the casing 80, fixing the casing 80 with the casing band 10, and removal and recovery of the rearmost casing 80 will be performed. This process is continued until all the casings 80 built into the ground 82 are recovered. At this time, predetermined measures such as pouring concrete are performed gradually while pulling out the casing 80 and/or after all the casings 80 are pulled out, depending on the purpose of the construction. Note that the all-casing construction method according to the embodiment of the present invention is not limited to the above content as long as it utilizes the casing band 10 according to the embodiment of the present invention.

Now, according to the embodiment of the present invention having the above configuration, it is possible to obtain the following effects. That is, the casing band 10 according to the embodiment of the present invention includes two clamping parts 12, a main body part 20, and a driving part 30 (cylinders 32, 34), as shown in FIG. is a portion that substantially supports the casing 80, and has a pressure contact surface 12a that is pressed against the outer periphery of the casing 80. The main body part 20 has a casing arrangement part 22 into which the casing 80 is inserted, and also positions and holds the two clamping parts 12. At this time, the casing arrangement part 22 is arranged in a plan view as shown in FIG. The two clamping parts 12 are held so that the pressing surfaces 12a of the two clamping parts 12 face each other with the part 22 in between. That is, when the casing 80 is inserted into the casing placement part 22, the pressure contact surfaces 12a of the two clamping parts 12 face each other with the casing 80 interposed therebetween. Further, the main body portion 20 is configured with an opening portion 24 such that the casing placement portion 22 is exposed when viewed from above in FIG. 1(a), and the opening portion 24 communicates with the casing placement portion 22. are doing. The drive unit 30 drives the two clamping parts 12 in directions toward and away from each other (see FIG. 2 for the separated state), and is housed in the main body part 20 holding the two clamping parts 12. Ru.

When the two holding parts 12 are driven by the driving part 30 in the direction of approaching each other with the casing 80 inserted into the casing arrangement part 22, the two holding parts 12 are moved from the opening part 24 of the casing arrangement part 22 in a plan view. At the position where the casing 80 protrudes, the casing 80 is held and supported. In other words, the casing band 10 in a state where the casing 80 is supported by the two holding parts 12 is, in plan view, in the direction from the casing placement part 22 to the opening part 24 (upward direction in FIG. 1(a)). It does not protrude beyond the casing 80. Therefore, as shown in FIGS. 5 and 6, even if the hole drilled by the casing 80 is close to the structure 90 and the casing 80 is present at the structure 90, the opening portion 24 of the casing arrangement portion 22 By installing the casing band 10 in a direction facing the structure 90, the casing 80 can be supported by the two holding parts 12 without being interfered with by the structure 90.

Furthermore, since the casing band 10 according to the embodiment of the present invention has a configuration in which the two clamping parts 12 are driven by the driving part 30, unlike the conventional casing band 100 as shown in FIG. There is no need to drive in or remove a wedge when fixing and releasing the fixing 80. Therefore, the working time and effort can be significantly reduced, and the work of collecting the casing 80 that involves fixing the casing 80 can be facilitated. In addition, since there is no impact sound when the wedge is driven in or removed, it can also contribute to noise reduction. Further, since there is no need for the worker to enter a narrow place that may be a blind spot, such as between the structure 90 and the casing 80, safety can also be improved. Furthermore, if the opening width of the opening portion 24 of the casing arrangement portion 22 is set larger than the diameter of the casing 80, the casing band 10 can be installed in advance around the casing 80 protruding from the drilled hole. Even if the casing 80 is not provided, the casing 80 can be easily installed at the required timing so that the casing 80 is placed in the casing placement part 22 through the opening portion 24.

Furthermore, the casing band 10 according to the embodiment of the present invention further includes an auxiliary pressure contact section 40 and an auxiliary drive section 44 (cylinder 46), as shown in FIG. Like the two clamping parts 12, the auxiliary pressure contact part 40 has a pressure contact surface 40a that is pressed against the outer periphery of the casing 80, and in a plan view, is connected to the opening part 24 of the casing placement part 22 provided in the main body part 20. It is installed in the main body part 20 so as to be pressed against the outer periphery of the casing 80 from the opposing position (downward in FIG. 1(a)). On the other hand, the auxiliary drive section 44 drives the auxiliary pressure contact section 40 in directions toward and away from the casing 80 (see FIG. 2 for the separated state). Therefore, the cylindrical casing 80 inserted into the casing arrangement part 22 is pressed in the direction toward the opening part 24 of the casing arrangement part 22 by the auxiliary pressure contact part 40, while being pressed from two opposing directions different from that direction. It will be held between two holding parts 12. As a result, the position of the casing band 10 is slightly adjusted so that the direction of the force applied from the two clamping parts 12 and the auxiliary pressure contact part 40 is directed toward the axis 80a of the casing 80 in plan view. Since it can be adjusted, it becomes possible to support the casing 80 more stably.

Furthermore, as shown in FIG. 3, the casing band 10 according to the embodiment of the present invention includes a spacer 50 that is detachably attached to the pressure contact surfaces 12a of the two clamping portions 12 and the pressure contact surface 40a of the auxiliary pressure contact portion 40. Therefore, it is possible to accommodate a casing 80 having a smaller diameter. That is, a second pressure contact surface 50a that will be pressed against the outer periphery of the casing 80 in the same manner as the pressure contact surfaces 12a is attached to the pressure contact surfaces 12a of the two clamping portions 12 held so as to face each other by the main body portion 20. By attaching the spacer 50 having the above, the positions of the surfaces that are pressed against the outer periphery of the casing 80 can be offset in the direction in which the two clamping parts 12 approach each other. Similarly, by attaching the spacer 50 having the second pressure contact surface 50a to the pressure contact surface 40a of the auxiliary pressure contact portion 40, the position of the surface that is pressed against the outer periphery of the casing 80 is adjusted to the opening portion 24 of the casing arrangement portion 22. can be offset in a direction approaching . As a result, as is clear from a comparison between FIG. 1 and FIG. 3, the casing 80 having different diameters can be held before and after the spacer 50 is attached to the two holding parts 12 and the auxiliary pressure contact part 40. Depending on the thickness of the spacer 50 and the stroke lengths of the holding part 12 and the auxiliary pressure contact part 40, it is possible to accommodate casings 80 of various diameters. Moreover, by preparing a plurality of casing bands 10 of different sizes, the range of sizes of the casing 80 that can be accommodated can be further expanded, including a large diameter casing 80.

Furthermore, in the casing band 10 according to the embodiment of the present invention, the drive section 30 that drives the two clamping sections 12 and the auxiliary drive section 44 that drives the auxiliary pressure contact section 40 are powered by hydraulic pressure. Then, hydraulic pressure is applied to the cylinders 32, 34, and 46 constituting the drive unit 30 and the auxiliary drive unit 44 from a drilling machine 70 (see FIGS. 5 and 6) that holds the casing 80 and drills the hole. A hydraulic circuit 56 as shown in FIG. 4 is provided. As a result, there is no need to separately prepare a power source for the drive section 30 and the auxiliary drive section 44, and hydraulic pressure is supplied as power from the drilling machine 70, which is also used when recovering the casing 80. Collection work, etc. can be performed efficiently, and the device configuration can be made compact.

On the other hand, in the all-casing construction method according to the embodiment of the present invention, as shown in FIG. When recovering the casing 80, as shown in FIGS. 6(b) and 6(c), the casing band 10 according to the embodiment of the present invention as described above is used. That is, the casing 80 connected to the last casing 80 is fixed by the casing band 10, and the last casing 80 is removed and recovered during that time. As a result, even if the casing 80 is next to the structure 90, the casing 80 can be easily recovered while being supported by the two holding parts 12 driven by the driving part 30. becomes. Note that the casing band 10 according to the embodiment of the present invention may be used to prevent the casing 80 from falling in construction methods other than the all-casing construction method. Naturally, it can also be used when the casing 80 is not adjacent to the structure 90.

10: Casing band, 12: Holding section, 12a: Pressure contact surface, 20: Main body section, 22: Casing arrangement section, 24: Opening section, 30: Drive section, 40: Auxiliary pressure contact section, 40a: Pressure contact surface, 44: Auxiliary Drive unit, 50: Spacer, 56: Hydraulic circuit, 70 (70A, 70B): Drilling machine, 80: Casing, 82: Ground

Claims (5)

A casing band used at an opening edge of a hole drilled in the ground using a casing to prevent the casing from falling into the hole,
two clamping parts having pressure contact surfaces that are pressed against the outer periphery of the casing;
a main body portion having a casing placement portion through which the casing is inserted, and positioning and holding the two holding portions so that the pressure contact surfaces face each other across the casing placement portion in plan view;
a driving part that is housed in the main body and that drives the two holding parts in directions toward and away from each other;
The main body portion has an opening portion configured to expose the casing placement portion when viewed from the front,
The two holding parts support the casing at a position where the casing protrudes from the opening part of the casing arrangement part and at a position where the two holding parts do not protrude from the opening part in plan view. Characteristic casing band. The casing band according to claim 1, further comprising a removable spacer on the pressure contact surfaces of the two holding parts. Furthermore, it includes an auxiliary pressure contact part having a pressure contact surface that is pressed against the outer periphery of the casing, and an auxiliary drive part that drives the auxiliary pressure contact part,
1 . The auxiliary press-contact portion is installed in the main body portion so as to be press-contacted to the outer periphery of the casing from a position facing the opening portion of the casing placement portion in plan view. Or the casing band described in 2. 1. The drive unit is powered by hydraulic pressure, and the drive unit includes a hydraulic circuit to which hydraulic pressure is supplied from a drilling machine that holds the casing and drills the hole. The casing band according to any one of items 3 to 3. An all-casing construction method characterized by utilizing the casing band according to any one of claims 1 to 4 when holding the casing with a drilling machine and drilling a hole in the ground, and then recovering the casing. .

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