JP2017002608A - Anchor installation method, boring rod used for the same and casing floatation prevention hardware - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anchor installation method which enables a pipe anchor having a length longer than what a trestle of a boring machine can accommodate thereon to be installed into the ground without requiring additional work such as scaffold assembling.SOLUTION: An anchor installation method, for installing a pipe anchor A having a length longer than what a trestle can accommodate thereon in the ground, comprises the steps to: excavate an initial hole H with a depth at least not shallower than half the length that the trestle can accommodate thereon; and bury the pipe anchor A in the hole while deepening the hole with the depth corresponding to a difference between the depth of the initial hole H and the length of the pipe anchor A.SELECTED DRAWING: Figure 12

Description

  The present invention relates to a method for embedding a pipe anchor, and more particularly to a method for embedding a pipe anchor longer than a gantry included in a boring machine used for embedding a pipe anchor, a boring rod used for the method, and a casing lifting prevention metal fitting.

In order to prevent and protect rocks, landslides, and avalanches on slopes, facilities such as protective fences and protective nets are installed on slopes. Anchors are installed on slopes of such facilities. It is used. The anchor may have a function of preventing the collapse of the slope not only for the installation of these facilities but also by the anchor itself.
As such an anchor, there is a pipe anchor using a steel pipe. In driving pipe anchors, in general, a dedicated material that has been processed to a steel pipe, such as a pipe anchor with a tapered tip, or a pipe anchor with a drilling bit at the tip. Is used.
The prior art regarding construction (driving) of a pipe anchor is disclosed by Patent Documents 1 and 2.

JP 2007-32169 A JP 2009-68229 A

As long as it is possible to use a heavy machine in driving the pipe anchor, there is no particular problem in construction regardless of the size of the pipe anchor. However, as a countermeasure against falling rocks, landslides, and avalanches on slopes, when pipe anchors are constructed on slopes, it is often an environment where heavy machinery cannot be used. In other words, on natural slopes where heavy machinery cannot be placed, it is basically necessary to bring equipment and materials manually. Therefore, the equipment and materials that can be used are naturally restricted, and the construction method and the size of pipe anchors that can be constructed are also restricted.
According to the techniques disclosed in Patent Documents 1 and 2, it is possible to embed a pipe anchor even in a rock portion or the like by equipment (lightweight boring machine) that can be manually brought into a natural slope. In addition, according to the technique disclosed in Patent Document 1, a simple steel pipe can be used as a pipe anchor. That is, it is not necessary to use a dedicated material for performing some processing on the steel pipe, which is very useful.
However, the above-described prior art has a problem that it is not easy to construct a pipe anchor having a length that cannot be attached to a frame of a boring machine. In order to construct a pipe anchor longer than the frame, additional work such as setting up the platform with a scaffolding and materials for that purpose are required (that is, loading and unloading of these materials). Work will also occur).

  In view of the above, the present invention is a construction method capable of driving a pipe anchor longer than the length that can be mounted on a frame of a boring machine into the ground, and an anchor that suppresses the generation of additional work such as assembling a scaffold. The purpose is to provide a driving method.

(Configuration 1)
In the construction method in which a pipe anchor longer than the length that can be mounted on the gantry is driven into the ground, first, a step of making an initial hole at least a depth greater than the difference between the length that can be mounted on the gantry and the length of the pipe anchor, and thereafter An anchor driving method comprising the steps of: further opening a hole having a depth corresponding to the difference between the initial hole and the length of the pipe anchor; and embedding the pipe anchor in the hole.

(Configuration 2)
In a construction method in which a pipe anchor longer than the length that can be mounted on the gantry is driven into the ground, the relative position of the drill bit that slides in the direction along the gantry at the rear end of the casing that is shorter than the length of the pipe anchor A step of fixing, a step of burying the casing in the ground as a result of excavation by the drill bit, a step of inserting the pipe anchor having a shoe attached to a tip of the embedded casing, and a step of excavation by the drill bit An anchor driving method comprising: driving the pipe anchor to a predetermined position in the ground; extracting the drill bit; and extracting the casing.

(Configuration 3)
In the construction method in which a pipe anchor longer than the length that can be mounted on the gantry is driven into the ground, the lower casing is attached to the drill bit that slides in the direction along the gantry and the lower casing is attached along with the drill bit. A step of burying in the ground; a step of attaching an upper casing to an upper portion of the lower casing; a step of burying the upper casing in the ground as a result of further drilling by the drill bit; and a step of burying the drill bit in the lower and upper casings An anchor driving method, comprising: a step of pulling out from the upper casing; and a step of inserting the pipe anchor into the upper and lower casings; and a step of extracting the upper and lower casings.

(Configuration 4)
In the method of driving a pipe anchor longer than the length that can be mounted on the gantry into the ground, at least a step of opening an initial hole having a depth greater than the difference between the length that can be mounted on the gantry and the length of the pipe anchor; Inserting the pipe anchor and attaching a drill bit that slides in a direction along the gantry to the pipe anchor, and driving the pipe anchor to a predetermined position in the ground accompanying excavation by the drill bit And a step of removing the drill bit. An anchor driving method comprising:

(Configuration 5)
A boring rod for use in the anchor driving method according to Configuration 2, wherein, in order to fix a relative position with respect to a drilling direction of a drill bit that slides in a direction along the frame at the rear end portion of the casing, A boring rod comprising a locking portion that comes into contact with a rear end portion of the casing or a center riser member.

(Configuration 6)
A casing levitation prevention metal fitting used in the anchor driving method according to Configuration 2 for fixing a relative position of a drill bit that slides in a direction along the frame at a rear end portion of the casing with respect to a digging direction. A casing levitation prevention metal fitting that comes into contact with a rear end portion of the casing or a member fixed to the casing by being attached to the boring rod.

  According to the anchor driving method of the present invention, a pipe longer than a length that can be mounted on a boring machine gantry while suppressing the generation of additional work such as installing a gantry at a high position by assembling a scaffold and the equipment for that purpose. An anchor can be driven into the ground.

The figure which shows the boring machine used for the anchor driving method according to the present invention The figure which shows the drill bit part of the boring machine used for the anchor driving method according to the present invention Schematic explanatory diagram of the anchor driving method of the first embodiment Schematic explanatory diagram of the anchor driving method of the first embodiment Schematic explanatory diagram of the anchor driving method of the first embodiment Schematic explanatory diagram of the anchor driving method of the first embodiment Schematic explanatory diagram of the anchor driving method of the second embodiment Schematic explanatory diagram of the anchor driving method of the second embodiment The figure which shows the boring rod used for the anchor driving-in construction method of Embodiment 2. The figure which shows the casing floating prevention metal fitting used for the anchor driving method of Embodiment 2 Schematic explanatory diagram of the anchor driving method of Embodiment 3 Outline explanatory drawing of anchor driving method of Embodiment 4

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. In addition, the following embodiment is one form at the time of actualizing this invention, Comprising: This invention is not limited within the range.

<Embodiment 1>
FIG. 1 is a view showing a boring machine used in an anchor driving method according to the present invention.
The boring machine itself used in the present invention is the same as that conventionally used, and is basically the same as that disclosed in Patent Documents 1 and 2 or the like. As shown in FIG. 1, the boring machine 1 includes a gantry 11, a drill bit drive unit (motor) 12, a winch 17, a drive unit winch 18, and the like.
The drill bit drive unit 12 is configured to slide (vertical direction in the drawing) on the gantry 11 and can be lifted and lowered by the drive unit winch 18. By attaching an air hammer and a drill bit to the drill bit drive unit 12 via a boring rod, the drill bit rotates and an impact due to impact is applied to obtain a drilling force.
The present invention basically assumes the driving of a pipe anchor on an inclined ground. In the anchor driving method of the present embodiment, the pipe anchor is driven in the vertical direction (not in the vertical direction with respect to the inclination S, Vertical direction). (Of course, it can also be used when the anchor is driven in a direction perpendicular to the inclined surface, or when it is constructed on a flat ground instead of an inclined ground.)
In installing the boring machine 1, the posture of the boring machine 1 is stabilized by using the holding rope 16. In the drawing, only one stay rope 16 is shown in a simplified manner, but actually, a plurality of stay ropes are used depending on the situation.
Although not shown, a hydraulic unit that supplies pressure oil to the drill bit drive unit 12 that is a hydraulic motor or a compressor that supplies air to the air hammer is also used.

FIG. 2 is a view showing the vicinity of the drill bit in the state in which the steel pipe 2 is driven in the boring machine 1 (equivalent to the technique disclosed in Patent Document 1).
As shown in the figure, in the state where the steel pipe 2 is driven, a drill bit 13 and an air hammer 14 (and a boring rod) are inserted into the steel pipe 2 to be embedded, and a bit head 131 is inserted from the lower end of the steel pipe 2. Protrudes. In this state, excavation is performed downward in the drawing by the rotation of the bit head 131 and the impact applied by the air hammer 14, thereby embedding the steel pipe 2.
The bit head 131 is configured to be able to reduce / expand the diameter. When the bit head 131 is inserted through the steel pipe 2, the outer diameter is smaller than the inner diameter of the steel pipe 2 by reducing the diameter. By expanding the diameter at a position protruding from the lower end of the steel pipe 2, the state shown in FIG. 2 is obtained.
A shoe 29, which is a ring-shaped member, is attached to the inside of the lower end of the steel pipe 2 by welding, and a stepped portion that abuts against the flange 132 of the drill bit 13 by the upper end of the shoe 29 is formed inside the steel pipe 2. It is formed. With this configuration, the steel pipe 2 is driven into the ground together with the drill bit 13 that excavates downward in the drawing while applying rotation and impact.

FIG. 3 is an explanatory view showing the outline of the entire process of the casing method that is the anchor driving method of the first embodiment, and FIGS. 4 to 6 are explanatory views showing the relationship with the boring machine 1 for each step. .
As shown in FIG. 3, the casing method according to the first embodiment roughly includes procedures 01 to 06. The casing method of Embodiment 1 uses divided casings (lower casing 21 and upper casing 22) in order to drive pipe anchor A (simple steel pipe in this embodiment) longer than the frame 11 of the boring machine 1, and these By burying the casing, a hole into which the pipe anchor A can be inserted is formed and held, and the pipe anchor A longer than the mount 11 of the boring machine 1 can be buried.
The lower casing 21 and the upper casing 22 are basically just steel pipes, but are threaded so that they can be connected to each other. That is, on the upper end side of the lower casing 21 and the lower end side of the upper casing 22, a male screw is formed on one outer periphery and a female screw is formed on the other inner periphery. The casing has a length equal to or longer than A. In the present embodiment, a two-divided casing is taken as an example, but it may be divided into three or more (such as one in which the lower casing 21 or the upper casing 22 is further divided).

In procedure 01, first, the lower casing 21 is buried.
As shown in the procedure 01 of FIG. 4, the lower casing 21 is embedded using the boring machine 1. As described in FIG. 2, a shoe 29 is attached to the lower end of the lower casing 21 (corresponding to the steel pipe 2 in FIG. 2), and the inclined surface is made vertical by the drill bit 13 and the air hammer 14 inserted through the inside of the lower casing 21. The lower casing 21 is buried along with the excavation.

  When the lower casing 21 is buried (at least until the upper casing 22 can be mounted on the mount 11 until the lower casing 21 is buried), the excavation is stopped once, and some of the upper boring rods 15 are removed to remove the upper casing 22. Form a space for mounting. The boring rod 15 can be adjusted in length according to the depth of excavation by connecting a plurality of divided rods.

Subsequently, as steps 02 and 03, the upper casing 22 is buried.
The upper casing 22 is embedded by attaching the upper casing 22 to the lower casing 21 (screws are screwed together) to integrate the casing and further excavating as shown in the procedure 02 of FIG.
3 and 4, when the upper casing 22 is also embedded, the excavation is stopped, the bit head 131 is reduced in diameter, the drill bit 13, the air hammer 14 and the boring rod 15 (the three The configuration is hereinafter referred to as “drilling assembly”), and the casing (lower casing 21 and upper casing 22) is pulled out.

Subsequently, as shown in steps 04 and 05 of FIG. 3, the pipe anchor A is inserted into the embedded casing (the lower casing 21 and the upper casing 22).
The pipe anchor A is inserted by using the winch 17 and suspending the pipe anchor A from the pulley at the top of the boring machine 1 as shown in FIGS. More specifically, as shown in FIG. 5, staking is performed in the vicinity of the middle portion of the pipe anchor A, and the pipe anchor A is set up as shown in FIG. 6 while being pulled up by the winch 17. The slinging around the middle part of the pipe anchor A is because the pipe anchor A is longer than the gantry 11 (that is, higher than the vicinity of the top of the boring machine 1). This is because the pipe anchor A cannot be lifted from the ground when it is lifted at 17. The staking position is slightly higher than the center of the pipe anchor A so that the pipe anchor A can be lifted and the pipe anchor A can be lifted up (built into the casing) efficiently.
As shown in step 05 of FIG. 6, the lower end of the suspended pipe anchor A is guided into the upper casing 22 and the boring machine 1 is tilted by operating the holding rope 16. This is because the drill bit drive unit 12 and the like located vertically above the hole of the casing interferes with the insertion of the pipe anchor A into the casing (the lower casing 21 and the upper casing 22). The position of the drill bit drive unit 12 and the like is shifted from vertically above the hole of the casing. In addition, by providing a mechanism capable of shifting the position of the drill bit driving unit 12, the boring machine 1 may not be inclined. “Mechanism capable of shifting the position of the drill bit drive unit 12” means, for example, a configuration in which the drill bit drive unit 12 can be deployed from the gantry 11 with a hinge, Such a structure is movable in the direction.

After inserting the pipe anchor A into the casing, the casing (the lower casing 21 and the upper casing 22) is removed by using the winch 17 of the boring machine 1 (step 06 in FIG. 3), and the boring machine 1 is removed (next) To the place where the pipe anchor A is driven), the burying of the pipe anchor A is completed.
In addition, mortar etc. are inject | poured into the pipe anchor A after embedding, and construction of the pipe anchor A is complete | finished.

As described above, according to the casing method of the present embodiment, it is possible to easily drive a pipe anchor that is longer than the length that can be mounted on a boring machine base with minimal equipment and materials. This is a very useful method on sloping terrain that needs to be carried in.
That is, as apparent from the configuration of the boring machine 1 described above, it is necessary to connect the drill bit drive unit 12 on the rear end (upper end) side of the pipe anchor to be embedded. Long pipe anchors cannot be installed. Conventionally, when a pipe anchor longer than such a gantry is embedded by the boring machine 1, the installation position of the boring machine 1 is raised by assembling a scaffold so that a pipe anchor longer than the gantry can be attached. According to the casing method of the present embodiment, there is no need to assemble such a scaffold. Therefore, the labor for assembling such a scaffold and the transportation of materials therefor are not required, and construction can be performed at a low cost and in a short construction period.
Moreover, when the length of the pipe anchor to be embedded becomes longer, the weight naturally increases. In the conventional construction method, it is necessary to put the drill bit 13 or the like through the pipe anchor to be buried, but this is limited in human work. On the other hand, according to the casing method of the present embodiment, the work weight per operation is reduced by embedding the casing which is divided and shortened, and the workability is also improved.

<Embodiment 2>
7 and 8 are explanatory views showing the outline of the entire process of the partial casing method that is the anchor driving method according to the second embodiment.
In addition, about the thing used as the structure and concept similar to Embodiment 1, the code | symbol same as Embodiment 1 is used, and description here is abbreviate | omitted or simplified.

  As shown in FIGS. 7 and 8, the partial casing method according to the second embodiment roughly includes steps 01 to 12. The partial casing method according to the second embodiment is a casing shorter than the length of the pipe anchor A (at least shorter than the gantry 11, in order to drive a pipe anchor A (simple steel pipe in this embodiment) longer than the gantry 11 of the boring machine 1. 11 is used, and a casing 23) having a length equal to or larger than the difference between the length that can be mounted on the pipe 11 and the length of the pipe anchor A is used, and the pipe anchor A is mounted by using a hole (initial hole) formed by embedding the casing. 11 so that the pipe anchor A longer than the frame 11 of the boring machine 1 can be embedded.

In procedure 01 (FIG. 7), first, the casing 23 is buried. The casing 23 in this embodiment is a simple steel pipe.
The shoe 29 is used in the burying of the casing of FIG. 2 and Embodiment 1, but the shoe 29 is not used in the burying of the casing 23 of the present embodiment. Instead, as shown in FIG. 9, a boring rod 15 ′ in which a locking portion 151 that abuts against the center riser member 27 attached to the rear end of the casing 23 is formed is used.
The center riser member 27 has play (turnable and slidable) so that the boring rod 15 (or 15 ') inserted into the casing or pipe anchor is located at the center of the casing or pipe anchor. (Ii) A member to be held. Although the description is omitted in the first embodiment, the centerer member 27 itself is also used in the first embodiment.
The boring rod 15 ′ of this embodiment is formed with a locking portion 151 that is a member that abuts against the center riser member 27. Thereby, the relative position with respect to the excavation direction of a drill bit is fixed. In the first embodiment, as the excavation assembly is excavated, the shoe 29 is pulled on the front end (lower end) side of the casing. In the present embodiment, the excavation of the excavation assembly proceeds, and the rear end (upper end) of the casing is advanced. It will be pushed in on the side.
In this embodiment, the shoe 29 does not exist at the tip (lower end) of the embedded casing 23 because of such a configuration.

As described above, the mounting of the casing and the excavation assembly is different from that of the first embodiment, but the casing 23 is buried in the same manner as the lower casing 21 of the first embodiment in other aspects (procedure 01). ).
Once the casing 23 is embedded (at least until the pipe anchor A can be mounted on the mount 11), the excavation is stopped, the bit head 131 is reduced in diameter, and the excavation assembly is embedded in the casing. 23 (procedure 02). At this time, a casing fixing member for preventing the casing 23 from being lifted together may be used. The casing fixing member includes a locking portion that presses the upper end of the casing, and is fixed to the boring machine 1 (the gantry or the lower guide at the lower end of the gantry) to prevent the casing from being lifted (boring machine 1 To prevent a relative upward movement).
Subsequently, the pipe anchor A with a shoe attached to the tip (lower end) is inserted into the embedded casing 23 (procedure 03). The operation of inserting the pipe anchor A into the casing 23 is the same as that described in the steps 04 and 05 of FIGS. However, in this embodiment, since the initial hole formed by embedding the casing 23 is shallower than the length of the pipe anchor A, the pipe anchor A protrudes from the ground as shown in step 04 of FIG. Become.
In this state, the drilling assembly is inserted into the pipe anchor A (procedure 05). The drilling assembly is installed in the pipe anchor A by lifting the drilling assembly using the winch 17, but between the upper end position of the pipe anchor A and the highest point that can be lifted by the winch 17. When the length of the drilling assembly is longer than the distance, the pipe anchor A cannot be built by suspending the upper end side of the drilling assembly. In this case, an intermediate portion of the drilling assembly is slung and a refill fitting having a diameter larger than that of the pipe anchor A is attached to the intermediate portion of the drilling assembly. By staking the middle part of the drilling assembly, the pipe anchor A can be installed, and the upper end side of the drilling assembly is suspended from the sling of the middle part in order to insert the drilling assembly into the pipe anchor A. When the winch 17 is replaced, the refill fitting is locked by being placed on the upper end of the pipe anchor A, and the excavation assembly is prevented from falling into the pipe anchor A. When the upper end side of the excavation assembly is hung by the winch 17, the assembling bracket is changed to the vicinity of the upper end portion of the excavation assembly (near the upper end of the boring rod), and the excavation assembly is inserted into the pipe anchor A. Then, when the refill fitting is locked by riding on the upper end of the pipe anchor A, the boring rod 15 is added, the refill fitting is replaced near the upper end of the added boring rod 15, and the drilling assembly is attached to the pipe anchor A. Insert inside. Thereafter, the excavation assembly is inserted to the lower end of the pipe anchor A by repeating the addition of the boring rod 15, the replacement of the refilling metal fitting, and the insertion of the excavation assembly. When the boring rod 15 has been added, the rear end portion of the boring rod 15 is connected to the drill bit drive unit 12 and the refill fitting is removed (procedures 05 to 08).
In embedment of the pipe anchor A, similarly to the embedment of the lower casing 21 of the first embodiment, the pipe anchor A is configured to be pulled on the tip (lower end) side using a shoe. Of course, the pipe anchor A inserted into the casing 23 has an outer diameter smaller than the inner diameter of the casing 23, and the drill bit 13 and the air hammer 14 are appropriately used.

  In the following procedure 09, further excavation by the excavation assembly is performed. Along with the excavation, the pipe anchor A is also buried. At this time, the casing 23 remains at the initial burying position, and only the pipe anchor A is buried, and only the pipe anchor A is buried so as to protrude further from the lower end of the casing 23. Here, if the shoe 29 is present at the lower end of the casing 23, a stepped portion due to the upper end portion of the shoe 29 is formed inside the casing 23 as can be understood from FIG. 2. If there is such a stepped portion, when the pipe anchor A is inserted so as to protrude further from the lower end of the casing 23, the lower end portion of the pipe anchor A is caught, and the pipe anchor A cannot be inserted successfully. obtain. In the present embodiment, the bowling rod 15 ′ having the locking portion 151 described above eliminates the need for the shoe 29 at the distal end portion (lower end portion) of the casing 23, so that such a problem is avoided.

  When the pipe anchor A reaches a predetermined embedding position, the excavation is stopped, the bit head 131 is reduced in diameter, and the excavation assembly is removed from the embedded pipe anchor A (procedures 10 to 11). Thereafter, the casing 23 is pulled out by using the winch 17 of the boring machine 1 (procedure 12), and the boring machine 1 is removed (moved to a place where the next pipe anchor A is driven), thereby burying the pipe anchor A. Is completed. In addition, mortar etc. are inject | poured into the pipe anchor A after embedding, and construction of the pipe anchor A is complete | finished. In extracting the casing 23, the drill bit driving unit 12 and the casing 23 are connected (an eye bolt is attached to the drill bit driving unit 12, a pin bolt is passed through the eye bolt and the casing 23, etc.), and the drill bit driving unit 12 rotates. The casing 23 may be pulled out by the force and the drive unit winch 18.

As described above, according to the partial casing method of the present embodiment, as with the casing method of the first embodiment, it is possible to easily drive a pipe anchor longer than the length that can be mounted on the frame of the boring machine with a minimum of equipment and materials. This is a very useful construction method on slopes where it is necessary to carry in equipment and materials manually.
Compared with the casing method of the first embodiment, the casing is simplified, and construction can be performed at a lower cost and a lower construction period.

Moreover, since the shoe at the lower end of the casing is not necessary as described above, the pipe anchor can be smoothly inserted into the casing, and the workability is excellent. This means that the clearance between the inner diameter of the casing and the outer diameter of the pipe anchor can be made as small as possible. From this aspect as well, the effects of reducing the amount of equipment and materials, saving labor, and improving workability can be achieved. desired. In other words, it is possible to adopt a casing having a diameter as small as possible, and not only the downsizing effect of the casing itself, but also the labor saving of the drilling capacity and the accompanying downsizing effect of the boring machine can be obtained. It will be.
In the present embodiment, the boring rod 15 ′ having the locking portion 151 that is a member that abuts against the center riser member 27 has been described as an example. However, the locking portion 151 is provided at the rear end (upper end) of the casing. It may be configured to hit. Further, the casing lifting prevention metal fitting 28 as shown in FIG. 10 may be used. The casing levitation prevention metal fitting 28 is a member that abuts against the rear end portion (upper end portion) of the casing by being attached to the boring rod 15, thereby fixing the relative position of the drill bit with respect to the excavation direction, and excavating assembly. As the excavation proceeds, the rear end (upper end) of the casing is pushed in. The casing levitation prevention metal fitting 28 in FIG. 10 (a) is configured to be bolted from four sides to a steel pipe having the same diameter as that of the casing, and to the groove for tightening the rod of the boring rod 15. By tightening the bolt 281, it is attached to the boring rod 15. The casing levitation prevention metal fitting 28 'shown in FIG. 10 (b) is formed with a rear end portion (upper end portion) of the casing by further forming a locking portion 282 with respect to the casing levitation prevention metal fitting 28 shown in FIG. 10 (a). Is more reliable. The casing levitation prevention metal fitting may be any member that is attached to the boring rod and abuts against the center riser member or the rear end (upper end) of the casing. For example, a tightening jig that can be opened and closed by a hinge (on the outer periphery of the boring rod). It may be a fitting jig).
In the first embodiment, the case in which the casing is embedded using a shoe is described as an example. However, in the casing method of the first embodiment, the boring rod 15 ′, the casing lifting prevention metal fitting 28, and the like may be used. .

<Embodiment 3>
FIG. 11 is an explanatory diagram showing an outline of the entire process of the simple partial casing method that is the anchor driving method according to the third embodiment.
In addition, about the thing which becomes the structure and concept similar to Embodiment 1 or Embodiment 2, the code | symbol same as Embodiment 1 or 2 is used, and description here is abbreviate | omitted or simplified.

  The simple partial casing method of Embodiment 3 is a case where the hole wall can be self-supported (the hole wall collapses and the hole is not buried) because the ground lower layer (the ground at least deeper than the casing 23) is a rock or the like. In this, it is a construction method that can be used in place of the partial casing construction method of the second embodiment.

The embedding of the casing 23 in the procedures 01 to 02 is the same as that in the second embodiment, and a description thereof will be omitted.
In the subsequent step 03, the excavation assembly of the size for the pipe anchor A is exchanged without inserting the pipe anchor A. Then, excavation is proceeded to the burial depth of the pipe anchor A (procedure 04), and when the predetermined depth is reached, the excavation assembly is removed (procedure 05).
Next, the pipe anchor A is inserted into the hole formed thereby, and the casing 23 is extracted (procedure 06).

  As described above, the simple partial casing method according to the present embodiment can be used on the ground deeper than the casing 23 under the condition that the hole wall can stand on its own (the hole wall does not collapse and the hole is not filled). Thus, the same effects as those of the first and second embodiments can be obtained.

<Embodiment 4>
FIG. 12 is an explanatory diagram showing an outline of the entire process of the pre-boring method that is the anchor driving method according to the fourth embodiment.
In addition, about the thing which becomes the structure and concept similar to Embodiment 1-3, the code | symbol same as Embodiment 1-3 is used, and description here is abbreviate | omitted or simplified.

  The pre-boring method of the fourth embodiment is a method that can be used when the hole wall can be self-supporting because the ground is a rock or the like (the hole wall does not collapse and the hole is not filled), and requires a casing. It is a construction method that does not.

In step 01, an initial hole H having a depth larger than the difference between the length that can be mounted on the gantry 11 and the length of the pipe anchor A is opened by a drilling assembly having a size larger than that for the pipe anchor A.
In the subsequent step 02, since there is an initial hole H, it is possible to mount the pipe anchor A (using the shoe) and the excavating assembly of this size on the frame 11 of the boring machine 1. Is installed.
After mounting, the excavation is further advanced to the depth of embedding of the pipe anchor A (procedures 03 to 04). When the predetermined depth is reached, the excavation assembly is removed (procedure 05).

  As described above, the pre-boring method of the present embodiment is more simplified than can be used under the condition that the hole wall of the initial hole H can be self-supported (the hole wall does not collapse and the hole is not filled). The same effect as in Embodiments 1 and 2 can be obtained.

1. . . 10. Boring machine . . Mount 12. . . Drill bit drive unit 13. . . Drill bit 131. . . Bit head 132. . . Buttock 14. . . Air hammer 15, 15 '. . . Boring rod 151. . . Locking part 16. . . Reservoir rope 17. . . Winch 18. . . Drive winch . . Steel pipe 21. . . Lower casing 22. . . Upper casing 23. . . Casing 27. . . Center riser member 28, 28 '. . . Casing lifting prevention metal fittings 29. . . Shoe A. . . Pipe anchor

Claims (6)

In the method of driving a pipe anchor longer than the length that can be mounted on the gantry into the ground,
First, a step of opening an initial hole having a depth equal to or greater than a difference between at least a length that can be mounted on the frame and a length of the pipe anchor;
Thereafter, further opening a hole having a depth corresponding to the difference between the initial hole and the length of the pipe anchor;
Embedding a pipe anchor in the hole;
An anchor driving method characterized by comprising: In the method of driving a pipe anchor longer than the length that can be mounted on the gantry into the ground,
Fixing a relative position with respect to a drilling direction of a drill bit that slides in a direction along the frame at a rear end portion of the casing shorter than a length of the pipe anchor;
Along with excavation by the drill bit, the step of burying the casing in the ground,
Inserting the pipe anchor with a shoe attached to the tip of the embedded casing;
Along with excavation by the drill bit, driving the pipe anchor to a predetermined position in the ground,
Removing the drill bit;
Removing the casing;
An anchor driving method characterized by comprising: In the method of driving a pipe anchor longer than the length that can be mounted on the gantry into the ground,
With the lower casing attached to a drill bit that slides in a direction along the gantry, the step of burying the lower casing in the ground accompanying excavation by the drill bit;
Attaching an upper casing to the upper part of the lower casing;
With the further excavation by the drill bit, the step of burying the upper casing in the ground,
Withdrawing the drill bit from the lower and upper casings;
Placing the pipe anchor in the upper and lower casings;
Removing the upper and lower casings;
An anchor driving method characterized by comprising: In the method of driving a pipe anchor longer than the length that can be mounted on the gantry into the ground,
At least a step of opening an initial hole having a depth equal to or greater than a difference between a length that can be mounted on the frame and a length of the pipe anchor;
Inserting the pipe anchor into the initial hole and attaching a drill bit that slides in a direction along the gantry to the pipe anchor;
Along with excavation by the drill bit, driving the pipe anchor to a predetermined position in the ground,
Removing the drill bit;
An anchor driving method characterized by comprising: A boring rod for use in the anchor driving method according to claim 2,
In order to fix the relative position with respect to the excavation direction of the drill bit that slides in the direction along the gantry at the rear end portion of the casing, a locking portion that comes into contact with the rear end portion of the casing or the center riser member is provided. A boring rod characterized by A casing lifting prevention metal fitting used in the anchor driving method according to claim 2,
In order to fix the relative position with respect to the excavation direction of the drill bit that slides in the direction along the gantry at the rear end of the casing, the rear end of the casing or the A casing levitation prevention metal fitting that contacts a member fixed to the casing.

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