JP2021101075A - Casing band and all-casing method using the same - Google Patents

Abstract

To easily recover a casing near a structure.SOLUTION: A casing band 10 comprises two sandwiching portions 12 having a pressure contact surface 12a that is pressure-contacted to an outer periphery of a casing 80, a main body portion 20 that positions and holds two sandwiching portions 12 so that the pressure contact surfaces 12a face each other with a casing arrangement portion 22 sandwiched in a plan view, and a driving unit 30 that drives the two sandwiching units 12 in the directions of approaching and separating from each other. The main body 20 is configured with an opening portion 24 so that the casing arrangement portion 22 is exposed in a front view, and the two sandwiching portions 12 support the casing 80 at a position where the casing 80 projects from the opening portion 24 in a plan view. Therefore, even if there is the casing 80 near the structure, by installing the casing band 10 so that the opening portion 24 faces the structure, the casing 80 can be supported by the two sandwiching portions 12 without being interfered with by the structure.SELECTED DRAWING: Figure 1

Description

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

In the all-casing method, which uses a casing to drill holes in the ground, the casings are connected in sequence according to the drilling depth, drilled to the target depth, and then concrete is placed in the drilled holes or the casing is used. Recovery or the like is performed (see, for example, Patent Document 1). In such an all-casing method or the like, when collecting the connected casing, for example, the casing band 100 as shown in FIG. 7 may be used. The casing band 100 fixes the casing 80 connected below the casing 80 to be collected, and the fixed casing 80 and all the casings 80 connected to the fixing casing 80 are inserted into the holes. It supports it so that it does not fall. In the example of FIG. 7, the casing band 100 forms an annular shape having a size corresponding to the outer circumference of the casing 80, and four notches 102 are evenly arranged on the inner peripheral portion thereof. Then, in each of the notch portions 102, a wedge is driven between the inner circumference of the casing band 100 and the outer circumference of the casing 80 to fix and support the casing 80. In FIG. 7, a part of the casing band 100 is transparently shown.

Japanese Unexamined Patent Publication No. 2006-083573

Here, since the conventional casing band 100 shown in FIG. 7 has a predetermined thickness over the entire circumference in order to secure the required strength, for example, it is shown by a two-dot chain line in FIG. 7A. When there is a casing 80 in the presence of such a structure 90 (when there is a hole drilled in the casing 80 near the structure 90), the casing band 100 cannot be installed around the casing 80, and the casing I couldn't support 80. Further, in the conventional casing band 100, wedges are driven between the inner peripheral surface of the casing band 100 and the outer peripheral surface of the casing 80 to support the casing 80, so that it takes time and effort to drive and remove the wedges. ..
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 near a structure.

(Aspect of the invention)
The following aspects of the invention exemplify the configurations of the present invention and will be described 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 components of each section are replaced, deleted, or the like while taking into consideration the best mode for carrying out the invention. Those to which the above-mentioned components are added can also be included in the technical scope of the present invention.

(1) A casing band used to prevent the casing from falling into the hole at the edge of the opening of a hole drilled in the ground using the casing, and is pressed against the outer periphery of the casing. The two sandwiching portions have two sandwiching portions having pressure contact surfaces and a casing arrangement portion through which the casing is inserted, and the two sandwiching portions are positioned so that the pressure contact surfaces face each other with the casing arrangement portion sandwiched in a plan view. The main body is included, and the main body is housed in the main body and includes a driving unit for driving the two sandwiching portions in a direction of approaching and separating from each other. The main body includes the casing when viewed from the front. An opening portion is configured so that the arrangement portion is exposed, and the two sandwiching portions support the casing at a position where the casing protrudes from the opening portion of the casing arrangement portion in a plan view (claim). 1).

The casing band described in this section includes two sandwiching portions, a main body portion, and a driving portion, and the two sandwiching portions are portions 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 portion has a casing arrangement portion through which the casing is inserted, and positions and holds the two sandwiching portions. At this time, the casing arrangement portion is sandwiched in a plan view and the pressure contact surface of the two sandwiching portions is sandwiched. Hold them so that they face each other. That is, in a state where the casing is inserted through the casing arrangement portion, the pressure contact surfaces of the two sandwiching portions face each other with the casing in between. Further, the main body portion is configured with an opening portion so that the casing arrangement portion is exposed when viewed from the front, and the opening portion communicates with the casing arrangement portion. The driving unit drives the two sandwiching portions in the directions of approaching and separating from each other, and is housed in the main body portion holding the two sandwiching portions.

Then, when the two sandwiching portions are driven by the driving portion in a direction approaching each other with the casing inserted through the casing arrangement portion, the two sandwiching portions are at positions where the casing protrudes from the opening portion of the casing arrangement portion in a plan view. , The casing is sandwiched and supported. In other words, the casing band in which the casing is supported by the two sandwiching portions does not protrude from the casing in the direction from the casing arrangement portion toward the opening portion in a plan view. Therefore, even if the hole drilled by the casing is close to the structure and there is a casing near the structure, the casing band is installed so that the opening portion of the casing arrangement portion faces the structure. , The casing is supported by the two sandwiching portions without being interfered with by the structure.

Further, since the casing band described in this section has a configuration in which two sandwiching portions are driven by a driving portion, unlike the conventional casing band, it is necessary to drive or remove wedges when fixing and releasing the casing. There is no. For this reason, the work time and labor are significantly reduced, and the casing recovery work that involves fixing the casing is facilitated. In addition, since there is no hitting sound when the wedge is driven or removed, it also contributes to the reduction of noise. Further, it is not necessary for the worker to enter a narrow place such as between the structure and the casing, which is a blind spot, and the safety is improved. Moreover, the casing band described in this section is pre-installed around the casing protruding from the drilled hole if the opening width of the opening portion of the casing arrangement portion is provided to be larger than the diameter of the casing. Even if it is not necessary, the casing can be easily installed at a timing as needed so that the casing is arranged in the casing arrangement portion through the opening portion.

(2) In the above item (1), a casing band (claim 2) including a removable spacer on the pressure contact surface of the two sandwiching portions.
The casing band described in this section is compatible with casings having a smaller diameter by including a removable spacer on the pressure contact surface of the two sandwiching portions. That is, a spacer having a second pressure contact surface to be pressure-welded to the outer periphery of the casing is attached to the pressure contact surfaces of the two sandwiching portions held so as to face each other by the main body portion. As a result, the positions of the surfaces that are pressed against the outer periphery of the casing are offset in the direction in which the two sandwiching portions approach each other. As a result, casings having different diameters are sandwiched before and after the spacers are attached to the two sandwiching portions. Therefore, casings having various diameters can be supported according to the thickness of the spacer and the stroke length of the sandwiching portion. It becomes a thing.

(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 to be pressed against the outer periphery of the casing and an auxiliary drive portion for driving the auxiliary pressure contact portion. 3 is a casing band installed in the main body portion so as to be pressed against the outer periphery of the casing from a position facing the opening portion of the casing arrangement portion in a plan view (claim 3).
The casing band described in this section further includes an auxiliary pressure contact portion and an auxiliary drive portion. Like the two sandwiching portions, the auxiliary pressure contact portion has a pressure contact surface that is pressed against the outer circumference of the casing, and the casing can be viewed from a position facing the opening portion of the casing arrangement portion provided in the main body portion in a plan view. It is installed in the main body so that it is pressed against the outer circumference.

On the other hand, the auxiliary drive unit drives such an auxiliary pressure contact portion in the direction of approaching and separating from the casing. Therefore, the cylindrical casing inserted through the casing arrangement portion is pressed by the auxiliary pressure contact portion in the direction toward the opening portion of the casing arrangement portion, and is sandwiched by two sandwiching portions from two opposite directions different from that direction. 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 portions of the two sandwiching portions and the auxiliary pressure contact portion is toward the axial center of the casing in a plan view. The casing will be supported more stably. When a spacer as described in item (2) above is attached to the two sandwiching portions, it is preferable that a spacer having an appropriate size is also attached to the auxiliary pressure contact portion.

(4) In the above items (1) to (3), the drive unit is powered by flood control, and the drive system is supplied with oil pressure from a drilling machine that holds and drills the casing. A casing band comprising a hydraulic circuit to be used (claim 4).
In the casing band described in this section, the drive unit that drives the two sandwiching portions is driven by a flood control, and the casing is drilled by holding the casing with respect to such a drive unit. , It is provided with a hydraulic circuit to which hydraulic pressure is supplied. As a result, it is not necessary to separately prepare a power source for the drive unit, and since hydraulic pressure is supplied as power from the drilling machine that is also used when collecting the casing, the casing recovery work etc. can be performed efficiently. Therefore, the device configuration is also compact. When the auxiliary drive unit as described in the above item (3) is provided, it is preferable that the hydraulic pressure is supplied as power from the drilling machine to the auxiliary drive unit via the hydraulic circuit.

(5) The casing band according to any one of (1) to (4) above is used when the casing is held by a drilling machine to drill holes in the ground and then the casing is collected. All-casing method (claim 5).
In the all-casing method described in this section, when the casing is added, the casing is held by a drilling machine to drill holes in the ground, and then the added casing is collected, the above items (1) to (4) are used. The casing band according to any one of the above items is used. That is, the casing connected to the rearmost casing is fixed by the casing band, and the rearmost casing is removed and collected in the meantime. As a result, even when the casing is near the structure, the casing can be easily recovered while the casing is supported by the two sandwiching portions driven by the driving portion.

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

It is a three-view view which shows the casing band which concerns on embodiment of this invention, and shows the state which sandwiched the casing. It is a top view which shows the state which does not hold the casing of the casing band of FIG. FIG. 5 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 diameter smaller than that of the casing of FIG. 1 is sandwiched. This is an example of a hydraulic circuit for supplying a hydraulic pressure from a drilling machine to a drive unit using a hydraulic pressure as a drive source of the casing band according to the embodiment of the present invention. It is a side view which shows the example of the drilling machine which drills a hole using a casing in the all-casing construction method or the like using the casing band which concerns on embodiment of this invention. It is a top view which shows the procedure at the time of using the casing band which concerns on embodiment of this invention in the all casing construction method. It is a top view and the front view which show the conventional casing band.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings. Here, detailed description of the same part or the corresponding part as in the prior art will be omitted, and the same part or the corresponding part will be indicated by the same reference numerals throughout the drawings.
1 and 2 show an example of the configuration of the casing band 10 according to the embodiment of the present invention, which is used to support the cylindrical casing 80 in the all-casing method or the like. In addition, in FIGS. 1 and 2, a part of the internal structure of the casing band 10 is transparently illustrated, and the casing 80 is illustrated by a chain double-dashed line. As shown in the figure, the casing band 10 according to the embodiment of the present invention includes two sandwiching portions 12, a main body portion 20, a drive portion 30, an auxiliary pressure contact portion 40, an auxiliary drive portion 44, and a hydraulic circuit 56. ..

The main body 20 forms the housing of the casing band 10 and houses other components of the casing band 10. Specifically, the main body 20 holds the two sandwiching portions 12 and the auxiliary pressure contact portion 40 so as to be movable as described later, and also houses the drive unit 30, the auxiliary drive unit 44, and the hydraulic circuit 56. .. Further, the main body portion 20 is provided with a casing arrangement portion 22 through which the casing 80 is inserted and arranged when supporting the casing 80, and the casing arrangement portion 22 is shown in FIG. 1 (a) in the present embodiment. ) And as shown in FIG. 2, it has a U-shape in a plan view. That is, the casing arrangement portion 22 has an opening portion in a notch shape so as to be exposed in the front view from above in FIGS. 1 (a) and 2 (the rear view when FIG. 1 (b) is the front view). 24 is formed.

When supporting the casing 80, the two sandwiching portions 12 are driven by the driving portion 30 as described later, and sandwich and fix the casing 80. Therefore, the two sandwiching portions 12 have an arcuate pressure contact surface 12a that is pressure-contacted with the outer periphery of the casing 80 in a plan view, and the pressure contact surfaces 12a face each other with the casing arrangement portion 22 sandwiched in a plan view. As described above, it is positioned and held by the main body 20. Further, as can be confirmed in FIG. 1A, the two holding portions 12 support the casing 80 at a position where the casing 80 protrudes from the opening portion 24 of the casing arrangement portion 22 in a plan view. ..

When the casing 80 is supported by the casing band 10, the auxiliary pressure welding portion 40 is auxiliary for so-called centering so that the two sandwiching portions 12 accurately grasp the axis 80a of the casing 80 and sandwich the casing 80. Is pressed against the casing 80. Therefore, the auxiliary pressure contact portion 40 has an arcuate pressure contact surface 40a that is pressure-welded to the outer periphery of the casing 80 in a plan view, and in the present embodiment, the pressure contact surface 40a is the casing from the side opposite to the opening portion 24. It is positioned and held by the main body 20 so as to face the arrangement 22. The auxiliary pressure contact portion 40 is driven by the auxiliary drive portion 44 as described later.

The drive unit 30 drives the two holding units 12 in the directions of approaching and separating from each other, and includes two hydraulic cylinders 32 and 34 in the present embodiment. The cylinder 32 drives one of the holding portions 12 located on the left side in the left-right direction in FIGS. 1 (a) and 2 (b), and one of the cylinders 32 is directed to the right when fixing the casing 80. The sandwiching portion 12 is driven (state of FIG. 1), and when the casing 80 is released from being fixed, one of the sandwiching portions 12 is driven toward the left (state of FIG. 2). Further, the cylinder 34 drives the other holding portion 12 located on the right side in the left-right direction in FIGS. 1 (a) and 2 (b), and is directed to the left when fixing the casing 80. The other sandwiching portion 12 is driven (state of FIG. 1), and when the casing 80 is released from being fixed, the other sandwiching portion 12 is driven to the right (state of FIG. 2).

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

Next, FIG. 3 shows a state in which a detachable spacer 50 is attached to the two sandwiching portions 12 and the auxiliary pressure contact portion 40. Each of these three spacers 50 has an arc-shaped second pressure contact surface 50a in a plan view and an arc-shaped mounting surface 50b in a plan view, and has a thickness of a predetermined width between them. There is. Each of the spacers 50 is detachably attached to the pressure contact surface 12a of the sandwiching portion 12 or the pressure contact surface 40a of the auxiliary pressure contact portion 40 so that the mounting surface 50b is more detachably attached to the pressure contact surface 12a or 40a than the pressure contact surface 12a or 40a. The second pressure contact surface 50a is arranged at a position close to the axis 80a of the casing 80. As a method of attaching the spacer 50 to the holding portion 12 and the auxiliary pressure contact portion 40, any detachable method can be adopted.

Therefore, when the two sandwiching portions 12 and the auxiliary pressure contact portion 40 are driven by the drive unit 30 and the auxiliary drive unit 44 in order to fix the casing 80, as shown in FIG. 3, each spacer is placed on the outer periphery of the casing 80. The second pressure welding surface 50a of 50 is pressure-welded. Here, the casing 80 shown in FIG. 3 has a smaller diameter than the casing 80 shown in FIGS. 1 and 2, but since the spacer 50 is used, the two sandwiching portions 12 and the casing 80 are used. The auxiliary pressure welding portion 40 fixes and releases the casing 80 with substantially the same stroke length as in the cases of FIGS. 1 and 2. Further, the casing 80 of FIG. 3 is fixed at a position so as to protrude from the opening portion 24 of the casing arrangement portion 22 even if its diameter is small.

Subsequently, in FIG. 4, as described above, the configuration of the hydraulic circuit 56 for supplying the electric 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. An example is shown. However, the hydraulic circuit 56 is not limited to the circuit configuration shown in FIG. In the embodiment of FIG. 4, a hydraulic circuit 56 is interposed between the directional control valve 72 included in the drilling machine 70 and the three cylinders 32, 34, and 46. The hydraulic circuit 56 generally includes two flow control valves 58 and 60, two check valves 62 and 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 rate control valve 60 are arranged between the direction control valve 72 and the cylinder 34, and a check valve 64 is arranged between the direction control valve 72 and the cylinder 46. ing. With such a configuration, the three cylinders 32, 34, and 46 are driven at the same time by switching the direction control valve 72 of the drilling machine 70. The physical connection between the direction control valve 72 of the drilling machine 70 and the hydraulic circuit 56 is, for example, a connector (not shown) provided in the vicinity of the hydraulic circuit 56 in the main body 20 shown in FIGS. 1 to 3. Realized through. Further, the casing band 10 may be detachable from the drilling machine 70, and the oil pressure may be supplied through the connecting portions 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 a part of the plurality of constituent parts shown in FIGS. 1 to 4 is used. It may be deleted or replaced, or a new component may be added. For example, if the casing arrangement portion 22 in which the casing 80 is arranged so as to protrude from the opening portion 24 is formed, the shape of the main body portion 20 is arbitrary, and the upper right portion of the main body portion 20 in FIG. 1A. The shape may be such that the upper left portion or the upper left portion is hollowed out, or may extend to the lower right portion or the lower left portion to form a U-shape in a plan view. Further, the shape of the casing arrangement portion 22 is also arbitrary, and is not limited to a U shape in a plan view. Further, the power source of the drive unit 30 and the auxiliary drive unit 44 may be electricity. In this case, the electric mechanism capable of generating the necessary and sufficient force to support the casing 80 is the drive unit 30 and the auxiliary drive unit 30. It is used for the drive unit 44.

Next, regarding the all-casing method according to the embodiment of the present invention using the casing band 10 according to the embodiment of the present invention described above, the drilling position is set to the structure 90 with reference to FIGS. 5 and 6. The case where they are close to each other will be described as an example. For the detailed configuration of the casing band 10, please refer to FIGS. 1 to 4 as appropriate. In the all-casing method, for example, the drilling machines 70 (70A, 70B) as shown in FIG. 5 are used to drill holes in the ground 82 and recover the casing 80. The drilling machine 70A shown in FIG. 5A uses a hydraulic multifunctional large-diameter drilling machine (so-called BG machine), and is used when construction is performed in a place where there is no particular height restriction. Ru. On the other hand, the drilling machine 70B shown in FIG. 5B is a BG machine compatible with a low-flying environment, which is used when construction is performed in a place where there is a height restriction such that a structure 90 exists overhead. is there.

Here, the all-casing method according to the embodiment of the present invention includes contents similar to the conventional all-casing method, but the description of such similar contents shall be simplified or omitted. To do. First, as shown in FIG. 6A, in the present embodiment, a hole is drilled at a design position of the ground 82 close to the structure 90 by using a drilling machine 70 using a casing 80. Specifically, the casing 80 is built, excavation and waste soil in the casing 80, and the addition of the casing 80 are repeated to drill holes to the design depth. After drilling to the design depth, after performing predetermined measures according to the purpose of construction, as shown in FIG. 6 (b), the edge of the opening of the hole drilled in the ground 82, that is, the periphery of the casing 80. The casing band 10 is installed in the. At this time, the casing band 10 is installed so that the casing band 10 is arranged in the casing arrangement portion 22 so that the opening portion 24 of the casing arrangement portion 22 faces the structure 90.

Subsequently, as shown in FIG. 6 (c), the drilling machine 70 is moved to a position where the rearmost casing 80 can be held, and the drilling machine is supplied with flood control from the drilling machine 70. The 70 is connected to the hydraulic circuit 56 of the casing band 10. Then, the rearmost casing 80 is held by the drilling machine 70, and the casing 80 connected to the rearmost casing 80 is arranged in the casing arrangement portion 22 of the casing band 10 by a predetermined length. Only the casing 80 is pulled out. After that, the cylinders 32, 34, and 46 were operated via the hydraulic circuit 56 by the hydraulic supply operation from the drilling machine 70, and the two sandwiching portions 12 and the auxiliary pressure welding portion 40 were connected to the rearmost casing 80. The casing 80 is pressed against the outer periphery of the casing 80 to fix the casing 80 (see FIG. 1). In this state, the rearmost casing 80 is removed from the casing 80 supported by the casing band 10, and the removed casing 80 is recovered.

Further, since the casing 80 is recovered as described above, the casing 80 supported by the casing band 10, which is the rearmost casing 80 at present, is held by the drilling machine 70 and then drilled. By operating from the machine 70, the fixing by the casing band 10 is released (see FIG. 2). After that, such holding and unfixing of the rearmost casing 80, pulling out of the casing 80 by a predetermined length, fixing of the casing 80 by the casing band 10, and removal and recovery of the rearmost casing 80 are performed. This is performed until all the casings 80 built in the ground 82 are recovered. At this time, while pulling out the casing 80, gradually and / or after pulling out all the casing 80, a predetermined measure such as placing concrete is performed according to the purpose of construction. The all-casing method according to the embodiment of the present invention is not limited to the above contents as long as the casing band 10 according to the embodiment of the present invention is used.

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

Then, when the two sandwiching portions 12 are driven by the driving portion 30 in the direction of approaching each other with the casing 80 inserted through the casing arranging portion 22, the two sandwiching portions 12 are driven from the opening portion 24 of the casing arranging portion 22 in a plan view. The casing 80 is sandwiched and supported at a position where the casing 80 protrudes. In other words, the casing band 10 in a state where the casing 80 is supported by the two holding portions 12 is in a plan view with respect to the direction from the casing arrangement portion 22 toward the opening portion 24 (upward direction in FIG. 1A). 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 time of the structure 90, the opening portion 24 of the casing arrangement portion 22 By installing the casing band 10 so as to face the structure 90, the casing 80 can be supported by the two sandwiching portions 12 without being interfered with by the structure 90.

Further, since the casing band 10 according to the embodiment of the present invention has a configuration in which the two sandwiching portions 12 are driven by the driving portion 30, unlike the conventional casing band 100 as shown in FIG. 7, for example, the casing When fixing and releasing the 80, it is not necessary to drive or remove the wedge. Therefore, the working time and labor can be significantly reduced, and the recovery work of the casing 80, which involves fixing the casing 80, can be facilitated. In addition, since there is no hitting sound when the wedge is driven or removed, it is possible to contribute to the reduction of noise. Further, since it is not necessary for the worker to enter a narrow place such as between the structure 90 and the casing 80 that becomes a blind spot, the safety can be improved. Moreover, if the opening width of the opening portion 24 of the casing arrangement portion 22 is larger than the diameter of the casing 80, the casing band 10 is preliminarily installed around the casing 80 protruding from the drilled hole. Even if it is not necessary, the casing 80 can be easily installed at a required timing so that the casing 80 is arranged in the casing arrangement portion 22 through the opening portion 24.

Further, as shown in FIG. 1, the casing band 10 according to the embodiment of the present invention further includes an auxiliary pressure contact portion 40 and an auxiliary drive portion 44 (cylinder 46). Like the two sandwiching portions 12, the auxiliary pressure contact portion 40 has a pressure contact surface 40a that is pressure-welded to the outer periphery of the casing 80, and has an opening portion 24 of the casing arrangement portion 22 provided in the main body portion 20 in a plan view. It is installed in the main body 20 so as to be pressed against the outer periphery of the casing 80 from the opposite position (downward in FIG. 1A). On the other hand, the auxiliary drive unit 44 drives such an auxiliary pressure contact portion 40 in the direction of approaching and separating from the casing 80 (see FIG. 2 for the separated state). Therefore, the cylindrical casing 80 inserted through the casing arrangement portion 22 is pressed in the direction toward the opening portion 24 of the casing arrangement portion 22 by the auxiliary pressure contact portion 40, and is pressed from two opposite directions different from that direction. It will be sandwiched by the two sandwiching portions 12. As a result, the position of the casing band 10 is slightly reduced so that the direction of the force applied from the three portions of the two sandwiching portions 12 and the auxiliary pressure contact portion 40 is toward the axial center 80a of the casing 80 in a plan view. Since it can be adjusted, the casing 80 can be supported more stably.

Further, as shown in FIG. 3, the casing band 10 according to the embodiment of the present invention includes a removable spacer 50 on the pressure contact surface 12a of the two sandwiching portions 12 and the pressure contact surface 40a of the auxiliary pressure contact portion 40. Therefore, it is possible to cope with the casing 80 having a smaller diameter. That is, the second pressure contact surface 50a is pressed against the pressure contact surface 12a of the two sandwiching portions 12 held so as to face each other by the main body portion 20 to the outer periphery of the casing 80 in the same manner as the pressure contact surface 12a. By attaching the spacer 50 having the casing 80, the position of the surface to be pressed against the outer periphery of the casing 80 can be offset in the direction of approaching each other by the two sandwiching portions 12. 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 to be pressure contacted with the outer periphery of the casing 80 can be determined by the opening portion 24 of the casing arrangement portion 22. Can be offset in the direction of approaching. As a result, as is clear from a comparison between FIGS. 1 and 3, casings 80 having different diameters can be sandwiched before and after the spacer 50 is attached to the two sandwiching portions 12 and the auxiliary pressure welding portion 40. Depending on the thickness of the spacer 50 and the stroke length of the sandwiching portion 12 and the auxiliary pressure welding portion 40, it becomes possible to correspond to the casing 80 having various diameters. Moreover, if a plurality of casing bands 10 having different sizes are prepared, the range of the sizes of the casing 80 that can be accommodated can be further expanded, including the casing 80 having a large diameter.

Further, in the casing band 10 according to the embodiment of the present invention, the drive unit 30 for driving the two sandwiching portions 12 and the auxiliary drive unit 44 for driving the auxiliary pressure contact portion 40 are powered by flood control. Then, the oil pressure is applied to the cylinders 32, 34, and 46 constituting the drive unit 30 and the auxiliary drive unit 44 from the hole drilling machine 70 (see FIGS. 5 and 6) that holds and drills the casing 80. It is provided with a hydraulic circuit 56 as shown in FIG. 4, which is supplied. As a result, it is not necessary to separately prepare the power sources for the drive unit 30 and the auxiliary drive unit 44, and the oil is supplied as power from the drilling machine 70, which is also used when collecting the casing 80. The collection work and the like can be performed efficiently, and the device configuration can be made compact.

On the other hand, in the all-casing method according to the embodiment of the present invention, as shown in FIG. 6A, while adding the casing 80, the casing 80 is held by the drilling machine 70 to drill holes in the ground 82, and then the casings are added. 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 rearmost casing 80 is fixed by the casing band 10, and the rearmost casing 80 is removed and collected in the meantime. As a result, even when the casing 80 is near the structure 90, the casing 80 can be easily recovered while the casing 80 is supported by the two sandwiching portions 12 driven by the drive unit 30. It becomes. The casing band 10 according to the embodiment of the present invention may be used in a construction method other than the all-casing construction method to prevent the casing 80 from falling. Further, as a matter of course, it can be used even when the casing 80 is not near the structure 90.

10: Casing band, 12: Holding part, 12a: Pressure contact surface, 20: Main body part, 22: Casing arrangement part, 24: Opening part, 30: Drive part, 40: Auxiliary pressure contact part, 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 to prevent the casing from falling into the hole at the edge of the opening of a hole drilled in the ground using the casing.
Two sandwiching portions having a pressure contact surface to be pressure-welded to the outer periphery of the casing,
A main body portion having a casing arrangement portion through which the casing is inserted, and positioning and holding the two sandwiching portions so that the pressure contact surfaces face each other with the casing arrangement portion sandwiched in a plan view.
It includes a drive unit housed in the main body portion and for driving the two sandwiching portions in a direction of approaching and separating from each other.
An opening portion is formed in the main body portion so that the casing arrangement portion is exposed when viewed from the front.
The casing band is characterized in that the two sandwiching portions support the casing at a position where the casing protrudes from the opening portion of the casing arrangement portion in a plan view. The casing band according to claim 1, wherein the pressure contact surface of the two sandwiching portions includes a removable spacer. Further, it includes an auxiliary pressure contact portion having a pressure contact surface to be pressed against the outer periphery of the casing, and an auxiliary drive unit for driving the auxiliary pressure contact portion.
The auxiliary pressure welding portion is installed on the main body portion so as to be pressure-welded to the outer periphery of the casing from a position facing the opening portion of the casing arrangement portion in a plan view. Or the casing band according to 2. Claim 1 is characterized in that the drive unit is powered by a flood control, and the drive unit is provided with a hydraulic circuit in which a hydraulic pressure is supplied from a drilling machine that holds and drills the casing. The casing band according to any one of 3 to 3. An all-casing construction method characterized in that the casing band according to any one of claims 1 to 4 is used when the casing is held by a drilling machine to drill holes in the ground and then the casing is recovered. ..

Images