JP6254782B2 - Excavation guide body and shaft excavation method using the excavation guide body - Google Patents

Description

  The present invention relates to an excavation guide body for forming a shaft in the ground and a shaft excavation method using the excavation guide body.

  Conventionally, when a relatively high structure such as an antenna tower or a steel tower is built, a ground shaft is formed by excavating the ground in order to construct a foundation such as a root pillar.

  For the formation of shafts, excavation for excavating the ground, such as an auger or down-the-hole hammer with a diameter corresponding to the thickness of the root pillar, that is, a diameter slightly larger than the diameter of the shaft to be formed Machine is used.

  In particular, the place where the rock mass exists in the ground is suitable for forming a solid foundation, and when excavating such a hard formation, striking excavators represented by down-the-hole hammers are widely used. Yes.

  However, when an antenna tower is formed in a mountainous area, the work is often performed in a relatively narrow place, and depending on the diameter of the root pillar to be formed as a foundation, an impact-type drilling of the corresponding thickness It may be difficult to carry in the machine.

  On the other hand, when forming a shaft using an earth drill bucket, first, an advanced hole having a smaller diameter than the diameter of the shaft to be formed is formed in the central portion of the shaft, and then a reverse hole having the same diameter is formed along the periphery of the advanced hole. A method of forming a shaft having a target diameter by forming a plurality of shafts adjacent to each other (hereinafter, a method of forming a shaft while expanding the diameter regardless of a construction machine used is also referred to as a diameter-excavation method). ) Has been proposed (see, for example, Patent Document 1).

  According to the formation of the shaft by the diameter expanding excavation method using this earth drill bucket, it is possible to form a large-diameter shaft while being a small-diameter earth drill bucket that is relatively easy to carry even in a mountainous area. .

Japanese Patent Laid-Open No. 10-018754

  However, a cutting-type excavator that excavates while cutting a rock like an earth drill bucket has a slower digging speed than an impact excavator.

  Therefore, the formation of a shaft using the conventional cutting excavator may be disadvantageous in terms of construction period and cost, depending on the diameter of the hole to be formed, compared to the formation of a shaft using a striking excavator. It was. In particular, the diameter expanding excavation method needs to form a plurality of holes such as advanced holes and reverse holes, and these drawbacks become more remarkable.

  Therefore, it is also conceivable to use a striking excavator when forming a shaft by the diameter expanding excavation method.

  However, since the striking excavator is accompanied by vibration during excavation, if the striking excavator is simply applied to the diameter-expanding excavation method, the displacement of the drilling position due to vibration occurs, and a clean diameter having a uniform diameter to the target depth is generated. There was a problem that it was difficult to form a shaft.

  The present invention has been made in view of such circumstances, and a excavation guide body capable of preventing a displacement of a drilling position due to vibration in forming a shaft by a diameter-expanding excavation method using a striking excavator. And a shaft excavation method using the excavation guide body.

In order to solve the above-mentioned conventional problems, the excavation guide body according to the present invention is inserted into an advanced hole formed by excavating the ground, and a plurality of adjacent reverse holes are formed along the peripheral edge of the advanced hole. An excavation guide body for assisting in positioning of a striking excavator that excavates the reverse hole when forming a hole having an enlarged diameter, wherein the advanced hole is protruded on the ground. A column body to be inserted; an anchoring body including an excavator insertion tube through which the excavator can be inserted; and a locking mechanism capable of arranging the excavator insertion tube at predetermined angles around the axis of the column body. It was decided to prepare.

Also, the drill guide of claim 1, before Kigakaritome mechanism is a slit which extends in the vertical direction on the ventral surface forming a pocket-like receiving part having an opening in the upper or lower, the more the opening A retaining member inserted into the receiving portion and formed wider than the slit width; and an insertion portion including a support body narrower than the slit connecting the retaining member and the excavator insertion tube. A slide fitting mechanism having either one of the receiving portion and the insertion portion disposed on the steadying body, and the other of the receiving portion and the insertion portion protruding on the ground. It is also characterized by being arranged at predetermined angles around the axis of the protruding portion of the column.

Also, the drill guide of claim 2, before Kigakaritome mechanism is protruded radially outward at a predetermined angle each in about the axis of the protruding portion of the columnar body to protrude on the ground A circumferential surface ridge portion comprising a plurality of protrusions, a tubular body tube that can be inserted through the protruding portion of the column body, and a column body insertion tube that has a meshing portion that meshes with the circumferential surface ridge portion at the lower edge thereof, and the same column It is also characterized in that it is configured by an engaging portion including a body insertion tube and a support body that connects the excavator insertion tube.

Further, in the excavation guide body according to claim 3 , in the excavation guide body according to claim 1 or 2 , the pillar body is characterized in that air can be discharged from an end portion on the ground side. Have.

Furthermore, in the shaft excavation method using the excavation guide body according to claim 4 , the shaft excavation method using the excavation guide body according to any one of claims 1 to 3 , wherein the ground is excavated. An advanced hole forming step for forming an advanced hole shallower than the length of the column body, a self-supporting step for inserting the column body into the advanced hole and making it self-supporting, and the bracing body at a predetermined angle with respect to the column body A drilling step of placing the excavator through the insertion tube and drilling a reverse hole shallower than the advanced hole adjacent to the peripheral edge of the advanced hole; and It has decided to have the repetition process which repeats the said perforation process by varying arrangement angle, and the extraction process which extracts the column from the advanced hole.

  According to the first aspect of the present invention, a hole which is inserted into an advanced hole formed by excavating the ground and has a plurality of backward holes formed along the peripheral edge of the advanced hole to form an enlarged diameter is formed. A drilling guide body for assisting positioning of a striking excavator that excavates the reverse hole, and a pillar body that is inserted into the advanced hole with one end protruding on the ground, and the excavation Drilling position by vibration because it includes a bracing body including an excavator insertion pipe that allows the machine to be inserted, and a locking mechanism that can arrange the excavator insertion pipe at predetermined angles around the axis of the column body It is possible to provide an excavation guide body that can prevent the deviation.

The front Kigakaritome mechanism is formed a slit which extends in the vertical direction on the ventral surface, and receiving portion of the pocket shape having an opening on the upper or lower, than the inserted the slit width than the opening in said receptacle wide A slide fitting mechanism comprising: a retaining member formed on the insertion member; and an insertion portion provided with a support body narrower than the slit connecting the retaining member and the excavator insertion tube. One of the insertion portion and the insertion portion is disposed on the steadying body, and the other of the receiving portion and the insertion portion is protruded on the ground. Since it arrange | positioned for every angle, an excavator insertion pipe can be arrange | positioned easily for every predetermined angle.

According to the present invention of claim 2 , the locking mechanism includes a plurality of protrusions that protrude radially outward at predetermined angles around the axis of the protrusion of the column that protrudes on the ground. And a columnar insertion tube provided with a meshing portion that engages with the circumferential surface protruding portion at the lower edge thereof, and a columnar insertion tube including the protruding portion of the columnar body. Since the engaging portion includes an insertion tube and a support that connects the excavator insertion tube, the excavator insertion tube can be easily arranged at every predetermined angle.

Moreover, according to this invention which concerns on Claim 3 , since the said column body enabled discharge | release of air from the underground side edge part, extraction from the advanced hole of a column body can be performed easily.

Moreover, according to this invention which concerns on Claim 4 , It is a shaft excavation method using the excavation guide body of any one of Claims 1-3 , Comprising: From the length of the said column body by excavating the ground An advanced hole forming step for forming a shallow advanced hole, a self-standing step for inserting the column body into the advanced hole to be self-supporting, and arranging the bracing body at a predetermined angle with respect to the column body, to the insertion tube Inserting the excavator, drilling a reverse hole shallower than the adjacent advanced hole along the peripheral edge of the advanced hole, and varying the arrangement angle of the stiffener relative to the column body Since it has decided to have a repetition process of repeating a drilling process and an extraction process of extracting the column from the advanced hole, the excavation guide is used when forming a shaft by a diameter-expanding excavation method using a striking excavator. Using the body, while preventing displacement of the drilling position due to vibration A shaft excavation method capable of forming a clean shaft having a uniform diameter to a target depth can be provided.

It is explanatory drawing which showed the structure of the excavation guide body which concerns on this embodiment. It is the perspective view which showed the protrusion part vicinity. It is explanatory drawing which showed the locking member annular arrangement body in the front view and planar view. It is explanatory drawing which showed the structure of the steadying body. It is explanatory drawing which showed the arrangement position of the bracing body around the axis | shaft of a pillar. It is explanatory drawing which showed the construction process. It is explanatory drawing which showed the construction process. It is explanatory drawing which showed the construction process. It is explanatory drawing which showed the construction process. It is explanatory drawing which showed the construction process. It is explanatory drawing which showed the construction process. It is explanatory drawing which showed the characteristic of the excavation guide body which concerns on the 1st and 2nd modification. It is explanatory drawing which showed the characteristic of the excavation guide body which concerns on a 3rd and 4th modification. It is explanatory drawing which showed the structure of the excavation guide body which concerns on a 5th modification.

  The present invention is inserted into an advanced hole formed by excavating the ground, and when forming a hole having an enlarged diameter by drilling a plurality of adjacent reverse holes along the peripheral edge of the advanced hole, An excavation guide body for assisting in positioning of a striking excavator to be excavated, a column body inserted into the advanced hole with one end projecting on the ground, and excavation enabling the excavator to be inserted An excavation guide body comprising an anchoring body including a machine insertion pipe and a locking mechanism capable of arranging the excavator insertion pipe at predetermined angles around an axis of the column body. It is.

  Here, it is about “adjacent” indicating the positional relationship between the advanced hole and the reverse hole. In this specification, “adjacent” means a state where the advanced hole and the reverse hole partially overlap or a state where they are just touching each other. Of course, it also includes the concept of being a little distant so that it can collapse.

  Hereinafter, the excavation guide body according to the present embodiment and a shaft excavation method using the excavation guide body will be described with reference to the drawings.

[Configuration of excavation guide body]
FIG. 1 is a perspective view showing the configuration of the excavation guide body A according to the present embodiment. The excavation guide body A includes a long cylindrical columnar body 10 whose upper portion is closed, and a short cylindrical bracing body 11 having openings on the upper and lower sides. , And can be detachably locked via the locking mechanism 12.

  The column 10 is a member that is inserted into an advanced hole formed by excavating the ground prior to forming a shaft.

  The column body 10 can be inserted into an advanced hole formed in advance by a striking excavator, and has a column body 10a having a diameter as large as possible, practically the same diameter as that of the striking excavator drilling the advanced hole. The locking member annularly arranged body 10b that functions as a part of the locking mechanism 12 is provided at the upper part of the column main body 10a.

  Further, the length of the column body 10 (column body 10a) is longer than the depth of the advanced hole, and includes an advanced hole insertion portion 10c that is inserted into the advanced hole, and a protruding portion 10d that protrudes from the advanced hole. . In addition, the length of the advanced hole insertion part 10c and the protrusion part 10d changes with the depth of an advanced hole.

  The protruding portion 10d is a cylindrical portion whose upper opening is closed, and the locking member annular arrangement body 10b is formed on the upper peripheral surface of the protruding portion 10d.

  FIG. 2 is a perspective view showing the vicinity of the protruding portion 10 d and shows a state in which the bracing body 11 is attached to the column body 10. FIG. 3 is an explanatory view showing the locking member annular arrangement body 10b in a front view and a plan view. The locking member annular arrangement body 10b is a part that functions as a part of the locking mechanism 12 for arranging the anti-vibration bodies 11 at predetermined angles around the axis of the column body 10.

  As shown in FIG. 2, the locking member annular arrangement body 10 b reinforces the plurality of receiving portions 13 arranged on the peripheral surface of the protruding portion 10 d of the column main body 10 a by connecting the receiving portions 13 together. The reinforcing member 14 and the lower regulating plate 15 constituting the bottom surface of the receiving portion 13 are included.

  The receiving portion 13 is formed with a slit 13e extending in the vertical direction on the abdominal surface 13d of the receiving portion 13 (shown by hatching in FIG. 2 and FIG. 3A), and has a pocket-like space having an upper opening 13f ( Hereinafter, it is referred to as a pocket-shaped space 13g), and is composed of two L-shaped bent plates that are bent in an L-shape in plan view as shown in FIGS.

  Specifically, as shown in FIG. 3B, the receiving portion 13 is a state in which the tip claw portion 13a formed by bending in an L shape is oriented clockwise around the axis of the column main body 10a. The first claw member 13b having the base end fixed along the longitudinal direction of the surface of the column main body 10a, and the second claw member 13c having the base end fixed in a state in which the distal end claw portion 13a faces counterclockwise. ing.

  Further, the first claw member 13b and the second claw member 13c are disposed with a space in the direction around the axis of the column main body 10a, and the front claw portion 13a of the first claw member 13b and the second claw member A slit 13e is formed on the abdominal surface 13d of the receiving portion 13 with a gap between the tip claw portion 13a of 13c.

  The reinforcing member 14 is a member for connecting and reinforcing the first claw member 13b and the second claw member 13c between the predetermined receiving portion 13 and the other receiving portion 13 adjacent to each other.

  Further, the lower regulating plate 15 is a member for forming a bottom portion of the receiving portion 13 provided on the upper peripheral surface of each column main body 10a, and an insertion portion 20 of the steadying member 11 described later is used as the receiving portion 13. When attached to the (pocket-shaped space 13g), it is prevented from falling down.

  The locking member annular arrangement body 10b configured as described above is configured by mounting the insertion portion 20 of the steadying body 11 on any of the receiving portions 13 provided in the locking member annular arrangement body 10b. The bracing body 11 can be arranged at predetermined angles around the axis of the column 10. In this embodiment, a total of eight receiving portions are provided every 45 degrees around the axis of the columnar body 10 to constitute the locking member annular arrangement body 10b.

  Moreover, the protrusion 10d side end of the column main body 10a is airtightly closed by a disc-like closing plate 16 having the same diameter as the column main body 10a.

  The closing plate 16 is provided with an air supply port 17 that passes through the closing plate 16 and communicates with the internal space of the cylindrical column main body 10a. When the column 10 is removed from the advanced hole, the air supply port 17 increases the internal pressure by supplying air from an air compressor (not shown) to the internal space of the column main body 10a via the air supply port 17. It functions as a means for reducing the resistance at the time of extraction by discharging air from the opening on the side of the advanced hole insertion portion 10c of the column main body 10a to remove earth and sand accumulated in the vicinity of the opening. .

  In addition, a hanging locking piece 18 and a joint 19 are provided on the closing plate 16. The suspension locking piece 18 is a portion used when the column body 10 is suspended by a building pole wheel or the like, and the joint 19 is a joint used for reducing slime resistance when the column body 10 is built or removed. It is.

  With respect to the column body 10 formed in this way, the anti-vibration body 11 arranged at predetermined angles around the axis of the column body 10 via the aforementioned locking member annular arrangement body 10b (locking mechanism 12) is as follows. As shown in FIG. 2, the insertion member 20 is inserted into the receiving portion 13 of the locking member annular arrangement body 10b and locked, and a short cylindrical excavator insertion tube 21 is formed.

  As shown in FIGS. 2 and 4, the insertion portion 20 includes a retaining body 20 a that is inserted into the pocket-shaped space 13 g from the upper opening 13 f of the receiving portion 13, and the retaining body 20 a and the excavator insertion tube 21. And a support 20b to be connected. In addition, this insertion part 20 is a site | part which comprises a part of locking mechanism 12 with the above-mentioned locking member annular arrangement body 10b. That is, in the locking mechanism 12, the locking member annular arrangement body 10 b that is a part of the column body 10 and the insertion portion 20 that is a part of the steadying body 11 constitute a slide fitting mechanism.

  The retaining member 20a is a plate-like member formed wider than the gap width of the slit 13e described above, and is allowed to move upward when inserted into the pocket-shaped space 13g of the receiving portion 13, The first claw member 13b, the second claw member 13c, and the lower regulating plate 15 regulate the movement of the column main body 10a in the direction around the axis, downward, and radially inward and outward.

  The support body 20b is a member for connecting and supporting the retaining body 20a and the excavator insertion tube 21 via the slit 13e of the receiving portion 13 when the mounting body 11 is attached to the column body 10. , And a plate material narrower than the slit 13e.

  The excavator insertion tube 21 is a member that inserts a striking excavator and serves as a guide for the excavator. As shown in FIG. 4A, the retaining body 20a is interposed via a support 20b. And a semi-cylindrical base side divided body 21a and a remaining semi-cylindrical movable side divided body 21b of the base side divided body 21a.

  Further, the inside of the cylinder constituted by the base side divided body 21a and the movable side divided body 21b, that is, the inside of the excavator insertion pipe 21 is used as an insertion space 24 for inserting the striking excavator. The diameter of the insertion space 24 (inner diameter of the excavator insertion pipe 21) is as small as possible while loosely fitting. More specifically, there is a gap between the inserted impact excavator and the inner wall of the excavator insertion pipe 21. The diameter is formed.

  Moreover, the division | segmentation for connecting the movable side division body 21b to the base side division body 21a in the position of the division part 23 of the excavator penetration pipe 21 divided | segmented into the movable side division body 21b and the base side division body 21a. The body support connection part 22 is provided.

  As shown in FIG. 4 (b), the split body pivot support portions 22 are provided at two locations, upper and lower, in the vicinity of the arc end in the plan view of the base side split body 21a, that is, in the vicinity of the two split portions 23. The base-side lock piece 22a, the movable-side lock piece 22b provided at two positions above and below the arc end in the plan view of the movable-side divided body 21b, and the two movable-side lock pieces 22b. The guide tube 22c is made up of a lock pin 22d.

  Further, the base side lock piece 22a provided above the base side divided body 21a is disposed above the movable side lock piece 22b provided above the movable side divided body 21b, and the base side divided body 21a The base side lock piece 22a provided below is disposed below the movable side lock piece 22b provided below the movable side divided body 21b, and the four base side lock pieces 22a and the movable side lock piece 22b are provided. Are overlapped in the vertical direction, and an elongated hole 22e for inserting the lock pin 22d is formed at the overlapping position. The guide cylinder 22c is disposed between the elongated holes 22e provided in the movable side lock piece 22b, and the lock pin 22d is inserted into the base side lock piece 22a, the movable side lock piece 22b, and the guide cylinder 22c. Thus, the movable side divided body 21b is pivotally connected to the base side divided body 21a.

  Then, by removing the lock pin 22d of either one of the two divided portions 23 of the excavator insertion pipe 21, the other divided body pivot connecting portion 22 is removed. The movable side divided body 21b rotates as a support shaft, and the insertion space 24 is configured to be opened on the side surface of the excavator insertion tube 21. That is, the side surface of the excavator insertion tube 21 can be opened and closed by rotating the movable-side divided body 21b into a door shape.

  Accordingly, when inserting or removing the hitting excavator that is suspended by a construction pole or the like from the excavator insertion tube 21, the movable side divided body 21b is opened as shown by a two-dot chain line in FIG. 4B. Thus, the striking excavator can be moved closer to or away from the radial direction of the excavator insertion tube 21, compared with the case where the striking excavator is inserted or removed from the upper opening of the excavator insertion tube 21 into the insertion space 24. Work easily.

  And when forming a shaft by the diameter expansion excavation method using the excavation guide body A which concerns on this embodiment, as shown in FIG. While being locked to a predetermined receiving portion 13 of the arranged locking member annular arrangement body 10b, as shown in FIG. 5, the excavator insertion tube 21 is arranged around the axis of the column body 10 at every predetermined angle, A striking excavator 25 is inserted into the insertion space 24 and a plurality of reverse holes 27 adjacent to each other along the peripheral edge of the advanced hole 26 are formed.

  At this time, the locking body 11 is allowed to move upward by the locking mechanism 12, but is firmly restricted from moving downward, around the axis of the column body 10, and radially inward and outward of the column body 10. Therefore, even if the reverse hole 27 is excavated by the striking excavator 25 with a lot of vibration, the deviation of the drilling position due to the vibration can be suppressed as much as possible, and it has a uniform diameter to the target depth. It becomes possible to form a beautiful shaft. Since the earth pressure of earth and sand or slime generated by excavation of the reverse hole 27 is applied to the column body 10, the rotation of the column body 10 in the direction around the axis is restricted.

[Construction flow]
Next, a specific construction flow will be described with reference to FIGS. Here, a down-the-hole hammer with a diameter of 300 mm is used as a striking excavator, and a shaft with a diameter of 800 mm is formed by drilling an advanced hole with a diameter of 300 mm and a depth of 4.5 m and a reverse hole with a diameter of 300 mm and a depth of 4.0 m. Then, the process of forming the basic resistance for the root pillar is given as an example. However, the present invention is not limited to these dimensions and applications. Moreover, the explanatory views shown in FIGS. 6 to 11 are shown for easy understanding of the construction process, and the scale and dimensions are not necessarily accurate.

  As shown in FIG. 6 (a), first, a construction moat 31 is formed on the ground 30, a pile core 31 a is set in the vertical direction, and a striking excavator 25 installed on a construction pillar 32 is used. Drilling is started along the pile core 31a.

  Then, as shown in FIG. 6 (b), the striking excavator 25 is dug to drill the advanced hole 26 (advanced hole forming step). At this time, the depth of the advanced hole 26 is shallower than the length of the column 10.

  Next, as shown in FIG. 7A, the pillar body 10 of the excavation guide body A is inserted into the drilled advanced hole 26 to be self-supporting (self-standing process). Specifically, the column body 10 is inserted into the advanced hole 26 with the protruding portion 10 d of the column body 10 protruding on the ground 30.

  Further, the mounting body 11 is mounted while being disposed at a predetermined angle with respect to the column body 10 via the locking mechanism 12.

  Next, as shown in FIG. 7 (b), the hitting excavator 25 is inserted through the excavator insertion tube 21 of the brace 11.

  Then, as shown in FIG. 8A, a reverse hole 27 shallower than the adjacent advanced hole 26 is formed along the peripheral edge of the advanced hole 26 (drilling process). The depth of the reverse hole 27 may be any depth that allows the columnar body 10 to stand on its own due to the difference in depth from the advanced hole 26. In the drawing, regarding the positional relationship between the advanced hole 26 and the reverse hole 27 in a plan view, each hole is indicated by a circle, so that it appears that there is a remaining portion that is not partially excavated between these holes. However, since the vibration of the hitting excavator 25 propagates and the remaining portion is indirectly destroyed and collapsed, the space between the advanced hole 26 and the reverse hole 27 is spatially connected in the lateral direction. Is formed.

  Next, as shown in FIG. 8 (b), the above-described drilling process is repeated while varying the arrangement angle of the bracing body 11 with respect to the columnar body 10, and a plurality of backward movements adjacent along the periphery of the advanced hole 26 are performed. Holes 27 are formed (repeated process).

  Next, after the reverse hole 27 is formed along the entire periphery of the advanced hole 26 by performing the repetition process, the tip of the air supply hose 33b connected to the air compressor 33a is connected to the column as shown in FIG. It is connected to the air supply port 17 of the body 10, and air is supplied to the inside of the column body 10 to increase the internal pressure, and air is ejected from the end opening on the advanced hole insertion portion 10c side so that the vicinity of the opening or the column body The earth and sand and slime deposited on the outer side of 10a are removed, and the resistance at the time of extraction is reduced.

  Next, as shown in FIG. 9B, the shaft B is formed by pulling out the column body 10 from the advanced hole 26 with the building column wheel 32 (extraction process).

  In this way, by using the excavation guide body A according to the present embodiment, the shaft B is formed by the diameter-expanding excavation method using the striking excavator 25 while preventing the deviation of the drilling position of the reverse hole 27 due to vibration. Can be formed.

  Next, the slime and excavation debris 34 accumulated at the bottom of the formed shaft B are removed. Specifically, as shown in FIG. 10 (a), a bucket 35 is attached to the construction pillar wheel 32, and the excavation gap 34 accumulated at the bottom of the shaft B is picked up to clean the residue in the shaft B. .

  And as shown in FIG.10 (b), the casing pipe 36 is inserted in the shaft B which became beautiful, and filling materials 37, such as sand and mortar, are filled into the clearance gap between the casing pipe 36 and the shaft B ( 11), the basic anti-C is completed.

[First Modification]
Next, the excavation guide body A1 according to the first modification will be described with reference to FIG. In the following description, the same components as those of the above-described excavation guide body A are denoted by the same reference numerals and description thereof is omitted. In FIG. 12, for the sake of easy explanation, the illustration of the steadying body 11 and the reverse movement hole 27 is omitted, and only their approximate positions are shown by two-dot chain lines.

  The excavation guide body A1 has substantially the same configuration as the excavation guide body A described above, but differs in configuration in that the receiving portion 13 provided in the locking member annular arrangement body 10b is arranged.

  Specifically, the excavation guide body A described above has eight receiving portions 13 around the axis of the column main body 10a, that is, every 45 degrees in the locking member annular arrangement body 10b. In the body A1, seven receiving portions 13 are provided around the axis of the column main body 10a, that is, approximately every 51.4 degrees.

  By adopting such a configuration, the excavator insertion tube 21 of the brace 11 is disposed at seven positions indicated by two-dot chain lines in FIG. In addition, the shaft B can be formed by drilling the reverse holes 27 in the entire peripheral edge of the advanced hole 26 while reducing the number of the reverse holes 27 formed. Moreover, workability | operativity can be improved as a soft rock countermeasure.

[Second Modification]
Next, an excavation guide body A2 according to a second modification will be described with reference to FIG.

  The excavation guide body A2 has substantially the same configuration as the excavation guide body A described above, but is configured in terms of the arrangement of the receiving portion 13 provided on the locking member annular arrangement body 10b, similarly to the excavation guide body A1. Are different.

  Specifically, in this excavation guide body A2, nine receiving portions 13 are provided around the axis of the column main body 10a, that is, about every 40 degrees.

  With this configuration, the excavator insertion tube 21 of the brace 11 is disposed at nine positions indicated by the two-dot chain line in FIG. In addition, the overlapping portion of the reverse holes 27 can be enlarged, and the vertical hole B can be formed by more firmly drilling the reverse holes 27 in the entire periphery of the advanced hole 26. Moreover, it can fully crush as a hard-rock countermeasure.

[Third Modification]
Next, an excavation guide body A3 according to a third modification will be described with reference to FIG. The excavation guide body A3 has substantially the same configuration as that of the excavation guide body A described above, but differs in configuration at the locking mechanism 12 portion.

  Specifically, the excavation guide body A described above constitutes the locking member annularly arranged body 10b by arranging a plurality of receiving portions 13 around the upper axis of the protruding portion 10d of the column main body 10a at a predetermined angle. The locking mechanism 12 is configured by disposing the insertion portion 20 on the stationary body 11, but this excavation guide body A3 places the insertion portion 20 at a predetermined angle around the upper axis of the protruding portion 10d of the column main body 10a. A plurality of arrangements constitute the locking member annular arrangement body 10b, while a receiving portion 13 is arranged on the anti-vibration body 11 to constitute the locking mechanism 12. In addition, like the lower restriction plate 15 in the excavation guide body A, the receiving portion 13 is closed by blocking the upper opening of the receiving portion 13 in order to restrict the swinging body 11 from falling off the column body 10. An upper restricting plate 15a constituting the surface is disposed. That is, in this excavation guide body A3, the insertion portion 20 of the column body 10 is inserted from the lower opening of the receiving portion 13 of the steadying body 11, and the upper portion of the insertion portion 20 is brought into contact with the upper restriction plate 15a. The columnar body 10 is locked to the bracing body 11 via the locking mechanism 12.

  Thus, even when the arrangement positions of the receiving part 13 and the insertion part 20 are reversed, when forming the shaft B by the diameter-expanding excavator 25 using the striking excavator 25, The excavation guide body A3 that can prevent the deviation can be provided.

[Fourth Modification]
Next, an excavation guide body A4 according to a fourth modification will be described with reference to FIG. The excavation guide body A4 also has substantially the same configuration as that of the excavation guide body A described above, but has a different configuration in the locking mechanism 12, and compared with the excavation guide body A described above, the receiving portion 13 and the insertion portion 20 are different in the fitting shape.

  Specifically, in configuring the locking member annular arrangement body 10b, the shape of the receiving portion 40 is a substantially semi-cylindrical shape in plan view extending in the vertical direction, and the pocket-shaped space 40a is a columnar space. The slit 40e is provided on the abdominal surface 40d formed by the first claw member 40b and the second claw member 40c of the receiving portion 40.

  Further, regarding the anti-vibration body 11, when the insertion portion 41 is configured, the shape of the retaining body 41a is a columnar shape.

  In this way, even when the shape is changed while maintaining the functions of the receiving part and the insertion part, when the shaft B is formed by the diameter-expanding excavator 25 using the striking excavator 25, the deviation of the drilling position due to vibration is caused. The excavation guide body A4 can be provided.

[Fifth Modification]
Next, an excavation guide body A5 according to a fifth modification will be described with reference to FIG. FIG. 14A is a perspective explanatory view showing a state before mounting the bracing body 11 to the column body 10 via the locking mechanism 50, and FIG. 14B shows a state after mounting. FIG.

  As shown in FIG. 14A, the excavation guide body A <b> 5 has a feature in the configuration of the locking mechanism 12.

  Specifically, the locking member annularly disposed body 10b disposed on the protruding portion 10d of the column body 10 has a plurality of protrusions 60 arranged at predetermined angles toward the outside in the radial direction of the column body 10a. It is comprised by the surrounding surface protruding item | line part 60a.

  In addition, the fitting body 61 includes a short tubular fitting tube 61 a and a support body 61 b that fixes the fitting tube 61 a to the excavator insertion tube 21. .

  Further, the lower edge portion of the fitting tube 61a is notched at a predetermined angle corresponding to the projection 60 of the locking member annular arrangement body 10b to provide an engagement recess 61c, and between the engagement recesses 61c. The engaging convex portion 61d is used.

  That is, the locking mechanism 50 in the excavation guide body A5 is a circumferential ridge formed by a plurality of protrusions 60 protruding outward in the radial direction at predetermined angles around the axis of the protrusion 10d of the column body 10. An engagement recess 61c and an engagement projection that engage with the peripheral ridge 60a at the lower edge of a tubular portion that can be inserted through the portion 60a (locking member annular arrangement body 10b) and the protrusion 10d of the column 10 A fitting engagement portion provided with a fitting tube 61a as a columnar insertion tube provided with a meshing portion 61e composed of 61d, and a support body 61b for connecting the fitting tube 61a and the excavator insertion tube 21. 61.

  And according to such a structure, as shown in FIG.14 (b), the bracing | locking body 11 can be latched and fixed for every predetermined angle around the axis | shaft of the pillar main body 10a, and the striking excavator 25 is used. Thus, when forming the shaft B by the diameter expanding excavation method, it is possible to provide the excavation guide body A5 that can prevent the deviation of the drilling position due to vibration.

  Further, according to this excavation guide body A5, with the column main body 10a inserted through the fitting tube 61a, the notch depth of the engaging recess 61c shown in FIG. If the bracing body 11 (fitting tube 61a) is raised by the length h which is the protruding length of the joint convex portion 61d, the arrangement position of the excavator insertion tube 21 can be easily set around the axis of the column main body 10a. Can be changed.

  As described above, according to the excavation guide body according to the present embodiment, the plurality of reverse holes 27 that are inserted into the advanced holes 26 formed by excavating the ground 30 and are adjacent along the peripheral edge of the advanced holes 26 are provided. An excavation guide body for assisting the positioning of the striking excavator 25 for excavating the reverse hole 27 when forming a hole (for example, a vertical shaft B) that has been drilled and expanded in diameter, and has one end at the ground A column body 10 that is inserted into the advanced hole 26 in a state of projecting above 30, a bracing body 11 that includes an excavator insertion tube 21 through which the excavator 25 can be inserted, and an axis of the column body 10. The excavator insertion pipe 21 is provided with a locking mechanism (for example, the locking mechanism 12 and the locking mechanism 50) that can be arranged at a predetermined angle. Prevents misalignment of drilling position due to vibration when forming Drilling guide body that can be, and can provide a drilling method of shafts with the same drill guide body.

  Finally, the description of each embodiment described above is an example of the present invention, and the present invention is not limited to the above-described embodiment. For this reason, it is a matter of course that various modifications can be made in accordance with the design and the like as long as they do not depart from the technical idea according to the present invention other than the embodiments described above.

DESCRIPTION OF SYMBOLS 10 Column body 10a Column main body 10b Locking member annular arrangement body 10c Advanced hole insertion part 10d Protrusion part 11 Stabilization body 12 Locking mechanism 13 Reception part 13d Abdominal surface 13e Slit 13f Upper opening 13g Pocket-shaped space 20 Insertion part 20a Detent Body 20b Support body 21 Excavator insertion tube 24 Insertion space 25 Stroke-type excavator 26 Advanced hole 27 Reverse hole 30 Ground 40 Receiving part 40a Pocket-like space 40d Abdominal surface 40e Slit 41 Insertion part 41a Detachment body 50 Locking mechanism 60 Projection part 60a Circumferential ridge A A excavation guide body A1 excavation guide body A2 excavation guide body A3 excavation guide body A4 excavation guide body A5 excavation guide body B vertical shaft C basic resistance

Claims (4)

A striking type that is inserted into an advanced hole formed by excavating the ground and excavating the reverse hole when forming a hole having an enlarged diameter by drilling a plurality of adjacent reverse holes along the peripheral edge of the advanced hole. An excavation guide body for assisting positioning of the excavator of
A pillar to be inserted into the advanced hole with one end protruding on the ground;
A bracing body including an excavator insertion tube through which the excavator can be inserted,
A locking mechanism capable of disposing the excavator insertion tube at predetermined angles around the axis of the column,
The locking mechanism is
A slit extending in the vertical direction on the abdominal surface is formed, and a pocket-shaped receiving part having an opening in the upper part or the lower part,
Insertion provided with a retaining member inserted into the receiving portion from the opening and formed wider than the slit width, and a support body narrower than the slit connecting the retaining member and the excavator insertion tube And
A slide fitting mechanism having
While either one of the receiving part and the insertion part is disposed on the steadying body,
One and the other, drilling guide body you characterized in that disposed at about the axis at a predetermined angle for each of the projecting portions of the columnar body to protrude on the ground of the insertion portion and the receiving portion. A striking type that is inserted into an advanced hole formed by excavating the ground and excavating the reverse hole when forming a hole having an enlarged diameter by drilling a plurality of adjacent reverse holes along the peripheral edge of the advanced hole. An excavation guide body for assisting positioning of the excavator of
A pillar to be inserted into the advanced hole with one end protruding on the ground;
A bracing body including an excavator insertion tube through which the excavator can be inserted,
A locking mechanism capable of disposing the excavator insertion tube at predetermined angles around the axis of the column,
The locking mechanism is
A circumferential ridge formed by a plurality of protrusions protruding outward in the radial direction at predetermined angles around the axis of the protrusion of the pillar projecting on the ground;
A columnar tube that has a tubular shape through which the projecting portion of the column can be inserted and has a meshing portion that meshes with the peripheral ridge at the lower edge thereof, and the columnar tube and the excavator tube are connected to each other An engaging portion comprising a support that
Drilling guide body characterized by being configured in. The pillar body, drill guides of claim 1 or claim 2, characterized in that a releasable air from the ground-side end portion. A shaft excavation method using the excavation guide body according to any one of claims 1 to 3 ,
An advanced hole forming step of excavating the ground to form an advanced hole shallower than the length of the column,
A self-supporting step of inserting the pillar body into the advanced hole to be self-supporting;
The bracing body is disposed at a predetermined angle with respect to the column body, the excavator is inserted through the insertion tube, and a reverse hole shallower than the adjacent advanced hole is formed along the peripheral edge of the advanced hole. Drilling process;
A repeating step of repeating the drilling step by changing the arrangement angle of the bracing member with respect to the column body;
An extraction step of extracting the column from the advanced hole;
A shaft excavation method characterized by comprising:

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