JP7128735B2 - Slide guide mechanism for high-pressure water supply rod - Google Patents

Description

Article 30, Paragraph 2 of the Patent Act applies ・DVD version of 2018 JSCE National Convention Proceedings (issued on August 1, 2018, published by JSCE) ・2018 JSCE National Convention, 73rd year Next academic lecture (August 29-31, 2018, held at Hokkaido University Sapporo Campus) ・Okumura Gumi Technical Research Annual Report No. 44 (published by Okumura Gumi Co., Ltd. on September 1, 2018)

TECHNICAL FIELD The present invention relates to a slide guide mechanism for a high-pressure water supply rod. The present invention relates to a slide guide mechanism for a high-pressure water supply rod that guides the slide movement of the supply rod.

For example, in the mountain tunnel construction method, excavation of the face of the tunnel is performed by crushing bedrock or the like by a blasting method using explosives. In this blasting method, it is necessary not to damage the ground around the face surface that is the target of blasting excavation while reducing overdrilling. ), pre-splitting method, etc. are known. In the smooth blasting method, a free surface is formed in the central part of the excavation area by core blasting, and then the free surface is gradually expanded to the surrounding area by blast blasting, and finally the ground surface of the outermost periphery is blasted and excavated. In addition, along the planned excavation line of the periphery, which is the outermost periphery of the face, a plurality of charge holes are arranged and formed more densely than usual, and a smaller amount of charge is loaded into these mounting holes. This is a method of excavating while mitigating the impact and pressure acting on the bedrock by exploding explosives and suppressing the compression failure of the bedrock due to the explosion so as not to damage the surrounding bedrock. The pre-splitting method first blasts a plurality of charge holes arranged along the planned excavation line at the perimeter of the excavation area to create cracks along the perimeter, thereby separating the surrounding ground from the excavation area. is isolated, the entire excavation area inside the peripheral portion is excavated by blasting while sequentially blasting the charge holes by the same method as the normal blasting method.

In addition, in blasting methods such as the smooth blasting method and the pre-splitting method, during blasting, cracks are generated with high accuracy along the planned excavation line of the periphery of the face surface, so that the face surface can be excavated more efficiently. A groove-shaped notch was cut in the inner peripheral surface of the charge hole, for example, using high-pressure water (water jet), in the direction along the planned excavation line on the periphery of the face surface so that It is preferable to form it in a state (for example, see Patent Document 2). In the conventional method of forming a groove-shaped cutout notch on the inner peripheral surface of the charge hole, the equipment for forming the cutout notch is an ultrahigh pressure water pump, an ultrahigh pressure water hose, and a lance (high pressure water supply rod). , an injection nozzle, etc., and the injection nozzle is provided in a nozzle head attached to the tip portion of the lance. The injection nozzles are provided so as to be able to simultaneously inject water jets in two radially symmetrical directions.

In order to form a groove-shaped notch on the inner peripheral surface of the charge hole, the injection direction of the water jet that is injected from the injection nozzle in two symmetrical directions in the radial direction is adjusted according to the excavation plan of the peripheral edge of the face surface. It is necessary to move the nozzle head in the axial direction of the charge hole while keeping the direction along the line, preferably pulling the nozzle head together with the lance from the tip portion of the charge hole inside the charge hole. . In addition, the injection nozzles are provided in the nozzle head so as to inject water jets in two radially symmetrical directions. When spraying, the nozzle head may rotate with the lance. Since there is a limit to the manufacturing accuracy of the injection nozzle and nozzle head, it is difficult to always prevent the nozzle head and lance from rotating even when the water jet is injected in two directions at the same time.

When the nozzle head rotates when a groove-shaped notch is formed on the inner peripheral surface of the charge hole by a water jet, the water jet from the injection nozzle is directed along the planned excavation line on the periphery of the face surface. It becomes difficult to cut and form the notch notch in the direction of the planned excavation line. Since the rotational force when the nozzle head rotates together with the lance along with the injection of the water jet is of a considerable magnitude, it is difficult to prevent the rotation by human power. For this reason, as a measure to prevent the nozzle head from rotating together with the lance, in the prior art, the lance is fixed to a dedicated device equipped with a slide mechanism, and the slide mechanism is used while preventing the rotation of the nozzle head. By axially moving the nozzle head together with the lance inside the charge hole, the notch can be formed while cutting in the direction of the planned excavation line.

JP 2009-168374 A JP-A-59-31393

The work of forming a groove-shaped notch on the inner peripheral surface of the charge hole by water jet is supported by a heavy machine for tunnel construction such as a hydraulic rock drill (drill jumbo), facing the face surface. A dedicated device equipped with a slide mechanism for sliding the lance is mounted on a worktable (mancage) that can move vertically and horizontally, and workers operate the dedicated device on the mancage. Dedicated devices with a slide mechanism are large and heavy, and therefore require a lot of time and effort to attach them to the man cage and align them with the charge hole, and also increase the manufacturing cost. In addition, as the length of the charge hole or lance increases, the length of the dedicated device with the slide mechanism also needs to be increased accordingly. Since there is a tendency to lengthen the construction span of blasting excavation, depending on the length of the charge hole, the size and weight of the dedicated equipment may be too large to be mounted on the man cage.

Furthermore, prior to injecting the water jet from the injection nozzle, the operation of inserting the nozzle head together with the lance to the tip of the charge hole while matching the drilling position and direction of the charge hole is performed by a dedicated slide mechanism. The position and orientation of the device are adjusted while adjusting the position and orientation of the mancage, but it is difficult to finely adjust the position and orientation of the dedicated device through operation via the mancage. In order to prevent the rotation of the nozzle head when pulling out the inserted nozzle head together with the lance from the tip of the charge hole while injecting the water jet from the injection nozzle, the direction of the injection nozzle was adjusted to the face surface. The work of fixing the lance to a dedicated device while aligning it with the direction of the planned excavation line on the peripheral edge also requires a lot of time and effort.

The present invention is supported by a heavy machine for tunnel construction when a groove-shaped cutout notch is formed in the inner peripheral surface of a charge hole arranged along the planned excavation line on the peripheral edge of the face by a water jet. It is possible to pull out the high-pressure water supply rod while preventing the nozzle head from rotating with a simple structure, and the direction of the water jet can be adjusted without much trouble. To provide a slide guide mechanism for a high-pressure water supply rod capable of forming a notch with high accuracy in a state in which a cutout notch is cut in the direction of an excavation plan line on the peripheral edge of a face by stabilizing it. and

The present invention relates to a mountain tunnel construction method in which cracks along the planned excavation line during blasting are formed on the inner peripheral surface of a plurality of charge holes drilled at intervals along the planned excavation line on the periphery of the face surface. When forming a notch notch that guides the formation of a water jet, a high-pressure water supply rod having a nozzle head at the tip is caused to inject a water jet from the nozzle head in a predetermined direction along the excavation plan line. A slide guide mechanism for a high-pressure water supply rod that guides the high-pressure water supply rod so as to slide in the axial direction of the charge hole, and is supported by heavy equipment for tunnel construction so that it can move up, down, left, and right facing the face surface. The high-pressure water supply rod is attached to a workbench and includes a guide mechanism main body, and the high-pressure water supply rod is attached to the outer peripheral portion of the slide area, which is a portion that slidably contacts the guide mechanism main body. The guide mechanism main body has a notched concave portion having a sliding surface on which the sliding surface of the square cross section of the slide region of the high-pressure water supply rod slides. Alternatively, a rotating body having a through hole and having the slide region slidably inserted into the cutout recess or the through hole with the central axis of the high-pressure water supply rod aligned with the rotation axis; To provide a slide guide mechanism for a high-pressure water supply rod, comprising rotation adjusting means capable of rotating the rotating body about an axis and fixing the rotating body at a predetermined rotation angle. Thus, the above object is achieved.

In the slide guide mechanism for the high-pressure water supply rod of the present invention, the sliding area of the high-pressure water supply rod is provided with a sliding surface having a rectangular cross section as a non-circular square cross section, and the notch recess of the rotor is provided. Alternatively, the through-hole preferably has a sliding surface on which the sliding surface of the rectangular cross section of the sliding region slides.

Further, in the slide guide mechanism for the high-pressure water supply rod of the present invention, the slide area of the high-pressure water supply rod has a sliding outer shell body in which a sliding surface having a non-circular square section is formed on an outer peripheral surface having a circular section. are mounted and fixed as one body, it is preferable to form a sliding surface with a non-circular rectangular cross-section on the outer peripheral portion.

Further, in the slide guide mechanism for the high-pressure water supply rod of the present invention, the sliding outer shell body has a pair of plate members in which the inner surface has a curved concave portion having a circular cross-section along the outer peripheral surface of the high-pressure water supply rod. By connecting the pair of plate members in a state in which the pair of plate members are arranged in parallel to sandwich the slide region, a non-circular square cross section is formed on the outer peripheral portion of the slide region. It is preferable to form a sliding surface.

Further, in the slide guide mechanism for the high-pressure water supply rod of the present invention, the rotating body having the notched recess has an opening surface portion having a width similar to the width of the notched recess on the outer peripheral surface, and The slide region is attached to the rotating body through the opening surface portion, and is slidably inserted into the notch recess with the central axis of the high-pressure water supply rod aligned with the rotation axis of the rotating body. preferably.

Further, in the slide guide mechanism for the high-pressure water supply rod of the present invention, the high-pressure water supply rod having the anti-slip member inserted into the notch recess in the width direction across the opening surface is disposed outside the slide area. is preferably attached to the

Further, in the slide guide mechanism for the high-pressure water supply rod of the present invention, the rotation adjustment means comprises a rotatable rotation operation shaft arranged in a lateral direction perpendicular to the rotation axis of the rotor, and and a worm wheel provided on the rotating body and meshing with the worm.

Further, the slide guide mechanism for the high-pressure water supply rod of the present invention comprises laterally moving means for moving the rotation adjusting means and the rotating body together in a lateral direction perpendicular to the rotation axis of the rotating body; It is preferable to include vertical movement means for moving the horizontal movement means in the vertical direction and horizontal rotation means for rotating the horizontal movement means in the circumferential direction around the vertical rotation axis. .

Further, in the slide guide mechanism for a high-pressure water supply rod of the present invention, the lateral movement means comprises a rotatable operating screw shaft arranged in a lateral direction perpendicular to the rotation axis of the rotating body, and a rotatable operating screw shaft. It is preferable to include a nut member which is threadedly engaged so as to move back and forth and which can move laterally together with the rotating body and the rotation adjusting means.

Further, in the slide guide mechanism for the high-pressure water supply rod of the present invention, the vertically moving means and the laterally rotating means are pole members that support the rotor, the rotation adjusting means, and the laterally moving means. and a strut member fixed to the workbench of the heavy machine for tunnel construction and supporting the pole member so as to be vertically movable and laterally rotatable.

Further, in the slide guide mechanism for the high-pressure water supply rod of the present invention, the vertical movement means and the horizontal rotation means lock the pole member against the vertical movement and horizontal rotation of the pole member. is preferably provided.

According to the high-pressure water supply rod slide guide mechanism of the present invention, a groove-shaped notch is formed by a water jet on the inner peripheral surface of the charge hole arranged along the planned excavation line on the peripheral edge of the face surface. To pull out a high-pressure water supply rod while preventing a nozzle head from rotating with a simple structure without requiring much labor by working on a workbench supported by a heavy machine for tunnel construction. and stabilize the direction of the water jet, the notch can be accurately formed in a state of being cut in the direction of the planned excavation line on the periphery of the face face.

FIG. 2 is a front view of a tunnel face showing the arrangement of a plurality of charge holes drilled in the face to be excavated by the blasting excavation method; FIG. 2 is an enlarged detail view of a portion A of FIG. 1; 3 is an enlarged cross-sectional view taken along line BB of FIG. 2; FIG. FIG. 4 is a partially broken front view for explaining a slide guide mechanism for a high-pressure water supply rod according to the present invention; 5 is an enlarged cross-sectional view taken along line CC of FIG. 4; FIG. 5 is an enlarged cross-sectional view taken along line DD of FIG. 4; FIG. 6 is an enlarged cross-sectional view taken along line EE of FIG. 5; FIG. It is a top view of a high-pressure water supply rod. FIG. 9 is an enlarged cross-sectional view taken along line FF of FIG. 8; FIG. 9 is an enlarged cross-sectional view taken along line FF of FIG. 8; FIG. 5 is an explanatory view of the operation of forming a notch on the inner peripheral surface of the charge hole using the slide guide mechanism for the high-pressure water supply rod according to the present invention;

A slide guide mechanism 1 (see FIG. 4) for a high-pressure water supply rod according to a preferred embodiment of the present invention is used when blasting and excavating the ground of the face surface 51 of bedrock or the like by pre-splitting, for example, in the mountain tunnel construction method. , by blasting a plurality of charge holes 60a (see FIG. 1) arranged along the planned excavation line 50a on the peripheral edge of the face 51, a groove-like groove that guides cracks along the planned excavation line 50a. The notch 61 (see FIG. 2) is employed as a mechanism for accurately forming the notch 61 (see FIG. 2) on the inner peripheral surface of each charging hole 60a using a water jet. That is, in the pre-splitting method, first, a plurality of charging holes 60a arranged along the peripheral edge of the face surface 51, which is an excavation area, are blasted to form cracks along the planned excavation line 50a of the peripheral edge. In order to isolate the excavation area from the surrounding ground by making it possible to separate the excavation area from the surrounding ground, preferably the inner peripheral surface of the charging hole 60a is provided with a predetermined A groove-shaped notch 61 that guides cracks in the direction is formed in a state of being cut in the direction along the planned excavation line 50a of the peripheral edge.

For example, as shown in FIG. 11, the operation of forming the groove-shaped notch 61 on the inner peripheral surface of the charge hole 50a is carried out by supporting a boom 80 of, for example, a drill jumbo as a heavy machine for tunnel construction. The lance 2, which is a high-pressure water supply rod with a nozzle head 3 attached to its tip, is moved by a man cage 81, which is a workbench that can be moved up, down, left, and right facing the surface 51. 60a is inserted into the charge hole 60a up to the tip portion, water jets are simultaneously injected in two radially symmetrical directions from the injection nozzle (orifice) 3c of the nozzle head 3, and the nozzle head 3 is moved to the lance. This is done by moving while pulling out together with 2. When the water jet is simultaneously injected in two radially symmetrical directions from the nozzle head 3 inside the charging hole 60a, the nozzle head 3 rotates together with the lance 2 due to factors such as the manufacturing accuracy of the injection nozzle 3c and the nozzle head 3. However, in this embodiment, by providing the slide guide mechanism 1 for the high-pressure water supply rod, the high-pressure water supply rod 2 can be pulled out while preventing the nozzle head 3 from rotating with a simple structure. By stabilizing the injection direction of the water jet, the notch 61 can be accurately formed in a state in which the notch 61 is cut in the direction of the planned excavation line 50a of the peripheral edge of the face surface 51. It is possible.

[Blasting excavation method]
First, the blast excavation method by pre-splitting in the mountain tunnel construction method will be described below with reference to FIGS. 1 to 3. FIG.

In the blasting excavation method by pre-splitting, the face 51, which is the excavation area of the tunnel 50, is mainly formed of hard ground 52 such as bedrock. A large number of perforated charging holes 60a, 60b, ..., 60j are formed. , 60j are loaded with explosives 71, 72, respectively, as shown in FIG. ∼ milliseconds (MS) or so, and are continuously detonated at a predetermined time difference and in a predetermined order.

In the blasting excavation method, the peripheral edge of the face surface 51 of the tunnel 50 is particularly controlled so that a smooth arc-shaped excavation cross section with little unevenness can be obtained along the planned excavation line 50a. The charge holes 60a arranged along the planned excavation line 50a are drilled and blasted. Groove-shaped cutout notches 61 for inducing cracks along the planned excavation line 50a on the peripheral edge of the face surface 51 are continuous in the longitudinal direction (perpendicular to the paper surface of FIG. 2) of the charging hole 60a. It is formed.

In addition, on the face surface 51 of the tunnel 50 shown in FIG. 1, a plurality (19 in the example shown) of the 0th stage are drilled at predetermined intervals along the planned excavation line 50a of the peripheral edge. A plurality of charge holes 60b, 60c, .

In the blasting excavation method by pre-splitting, explosives 71 and 72 are respectively charged in a plurality of zeroth stage charging holes 60a arranged along the planned excavation line 50a on the periphery of the face 51 (see FIG. 3). explodes, cracks are generated along two notches 61 (see FIG. 2) respectively formed on the inner peripheral surface of each charging hole 60a. That is, the cutout notch 61 functions to induce a crack to occur along the planned excavation line 50 a on the peripheral edge of the face 51 . After that, the charge holes 60b, 60c, . As a result, the area inside the peripheral edge of the face surface 51 is efficiently excavated.

By the way, the plurality of charging holes 60a arranged along the planned excavation line 50a in the peripheral portion of the face 51 are circular holes having a hole diameter of about φ45 mm, for example, and are drilled into the face 51 using, for example, a drill jumbo. Perforations are formed at appropriate circumferential intervals along the perimeter. Here, the charge hole 60a is preferably formed to have a drilling depth L of about 1.0 to 3.0 m, and along the peripheral edge of the face surface 51 is 600 mm to 900 mm (this embodiment A plurality of them are arranged at predetermined intervals in the circumferential direction so as to have a center-to-center pitch P of about 700 mm. In addition, each charging hole 60a is drilled with an outward angle so as to have a so-called lookout so that the cross section of the tunnel 50 can be maintained at its designed cross section size. is desirable (see FIG. 11).

[Slide guide mechanism of high-pressure water supply rod]
Next, the slide guide mechanism 1 for the high-pressure water supply rod of this embodiment will be described below with reference to FIGS. 4 to 10. FIG. A high-pressure water supply rod slide guide mechanism 1 shown in FIGS. 4 and 5 is a mechanism for guiding the sliding movement of a high-pressure water supply rod (lance) 2 shown in FIG. Here, the high-pressure water supply rod 2 is provided in each of a plurality of charge holes 60a drilled at predetermined intervals along the planned excavation line 50a on the periphery of the face 51 of the tunnel 50 shown in FIG. It is for supplying high-pressure water (water jet) that is jetted toward two locations facing each other in the radial direction of the inner peripheral surface.

The high-pressure water supply rod 2 shown in FIG. 8 has a circular hole-shaped high-pressure water supply path 2a (see FIG. 9) at the center of the shaft of a round bar having a circular cross section (see FIG. 9). ), and a nozzle head 3 is attached to the tip thereof. A circular hole 3a communicating with the high-pressure water supply passage 2a formed in the high-pressure water supply rod 2 is formed in the center of the axis of the nozzle head 3. A circular hole 3b is formed penetrating in the direction ) of the nozzle head 3, and the circular hole 3b is provided at two locations (two locations with different directions by 180°) facing each other in the radial direction of the outer peripheral surface of the nozzle head 3. Injection ports (injection nozzles) 3c (See FIG. 10). A high pressure water supply passage 2a formed in the axial center of the high pressure water supply head 2 is connected to an ultra high pressure water pump 83 via an ultra high pressure water hose 82 (see FIG. 11).

By the way, the slide guide mechanism 1 for the high-pressure water supply rod shown in FIGS. 4 and 5 is supported by a boom 80 of, for example, a drill jumbo as a heavy machine for tunnel construction, and moves vertically and horizontally while facing the face 51. The high-pressure water supply rod 2 is in slidable contact with the guide mechanism main body 5 attached to a man cage 71 (see FIG. 11), which is a possible workbench. A sliding surface 2c having a non-circular rectangular cross section is provided on the outer peripheral portion of the sliding region 2b (see FIG. 8).

[Sliding area of high-pressure water supply rod]
In this embodiment, the sliding area 2b of the high-pressure water supply rod 2 is provided with a sliding surface 2c of non-circular square cross-section, preferably rectangular cross-section, as shown in FIGS. In addition, the slide region 2b of the high-pressure water supply rod 2 has a non-circular, preferably rectangular cross-sectional sliding area on the outer peripheral surface because the sliding outer shell 4 is integrally attached and fixed to the outer peripheral surface of the circular cross-section. forming the surface 2c. The sliding outer shell 4 has a rectangular cross-sectional shape that can form a sliding surface 2c with a non-circular square (rectangular) cross-section, and the inner surface has a circular cross-section on the outer peripheral surface of the high-pressure water supply rod 2. It is composed of a pair of plate members 6 having an arcuate curved concave portion 6a formed along them. As shown in FIGS. 8 and 9, the pair of plate members 6 are arranged parallel to each other with the high-pressure water supply rod 2 sandwiched therebetween, and are separated from each other by an appropriate interval in the longitudinal direction. The upper and lower portions (the upper and lower portions in FIG. 9) are integrally connected by bolts 7 and nuts 8 to form a rectangular cross-sectional shape. Here, as shown in FIG. 9, each bolt 7 penetrates the left and right plate members 6 vertically with the high-pressure water supply rod 2 interposed therebetween, and a nut 8 screwed to the threaded portion at the end of the plate member 6 is tightened. Thus, the pair of plate members 6 are connected to each other with the high-pressure water supply rod 2 sandwiched therebetween.

[Guide mechanism body]
In this embodiment, as shown in FIGS. 4 and 5, the guide mechanism main body 5 is a slidable sliding surface 2c having a square cross section (rectangular cross section) of the slide region 2b of the high-pressure water supply rod 2. a rotating body 9 having a cutout recess 9a having a surface 9c and having a center axis aligned with the rotation axis C1, and a sliding region 2b of the high-pressure water supply rod 2 being slidably inserted into the cutout recess 9a; , rotation adjustment means 20 for rotating the rotating body 9 about the rotation axis C1 and fixing the rotating body 9 at a predetermined rotation angle. The notch recess 9a of the rotating body 9 has a sliding surface 9c on which the sliding surface 2c of the slide region 2b of the high-pressure water supply rod 2, preferably having a rectangular cross section, slides.

Further, in the present embodiment, the guide mechanism main body 5 includes a lateral movement means 30 for moving the rotation adjustment means 20 and the rotating body 9 in the lateral direction (horizontal direction in FIG. 4), a lateral movement means 30, a rotating A vertical movement means 40A for vertically moving the body 9 and the rotation adjustment means 20 as a unit, and a horizontal movement means 30, the rotating body 9 and the rotation adjustment means 20 for moving in a circumferential direction around the vertical rotation axis C3. (horizontal direction) and lateral direction rotating means 40B for integrally rotating. In the following description, the advancing and retracting direction toward the face 51 (see FIG. 1) of the high-pressure water supply rod 2 (perpendicular to the paper surface of FIG. 4, the left-right direction of FIG. 5) is referred to as the "front-rear direction". is referred to as the "horizontal direction".

<Rotating body>
The rotating body 9 is composed of a rotatable worm wheel 9A and a notched cylindrical body 9B integrally attached to the worm wheel 9A. These worm wheel 9A and notched cylindrical body 9B are mounted on a horizontal base 10 It is rotatably supported on a box-shaped rectangular frame 11 erected on the center of the axis of rotation C1 (see FIG. 5) extending in the front-rear direction (left-right direction in FIG. 5). Specifically, the rotating body 9 is rotatably supported on the rectangular frame 11 by a plurality of bearings 12 (see FIG. 4) attached to the rectangular frame 11 .

Here, as shown in FIGS. 4 and 7, at the center of the axis of the notched cylindrical body 9B constituting the rotating body 9, there is a sliding surface having a square cross section (rectangular cross section) of the slide region 2b of the high-pressure water supply rod 2. A notch recess 9a having a sliding surface 9c having a shape (rectangular shape) along 2c is penetrated along the front-rear direction (perpendicular to the paper surface of FIG. 4). An opening 9a1 having a width equal to the width of the notched recess 9a is formed on the outer peripheral surface of the rotating body 9 composed of the notched cylindrical body 9B through which the notched recess 9a extends and the worm wheel 9A. It is formed with an opening. The sliding region 2b of the high-pressure water supply rod 2 by the sliding outer shell 4 is fitted from above into the notch recess 9a inside the rotating body 9 manually, for example, by an operator through the opening surface 9a1. It is mounted so as to be slidable in the front-rear direction (see FIG. 4). Therefore, the high-pressure water supply rod 2 having the sliding region 2b by the sliding outer shell 4 is arranged in a state where the central axis of the high-pressure water supply rod 2 is aligned with the rotation axis (axis center) C1 of the rotor 9. 9 can be easily slidably inserted in the front-rear direction (perpendicular to the paper surface of FIG. 4). As shown in FIGS. 4 and 5, one axial end surface (right end surface in FIG. 5) of a portion of the notched cylindrical body 9B of the rotating body 9 protruding outside the rectangular frame 11 is provided with the rotating body A pointer 13 is attached to identify the rotation direction and rotation angle of 9 .

By the way, as described above, when the sliding region 2b formed by the sliding outer shell 4 attached to the high-pressure water supply rod 2 is inserted into the cutout recess 9a of the rotating body 9 from above, the rotating body 9 is moved. As shown in FIGS. 5 and 7, in the portion of the notched cylindrical body 9B that protrudes outside the rectangular frame 11, the retaining member 14 is inserted into the notched recess 9a across the width of the opening 9a1. It is preferably mounted outside of the slide area 2b which is closed. Specifically, as shown in FIG. 7, a pair of plate-like fixing members 15 that sandwich the notched cylindrical body 9B of the rotating body 9 from the left and right sides are screwed with fixing screws 16, respectively. 14 can be detachably attached to a pair of fixing members 15 by tightening left and right fixing screws 16 . As a result, the high-pressure water supply rod 2 is charged until the nozzle head 3 reaches the tip of the charge hole 60a while the sliding region 2b of the high-pressure water supply rod 2 is inserted into the notch recess 9a of the rotating body 9. After inserting into the hole 60a, the nozzle head 3 is slid while being pulled out together with the high-pressure water supply rod 2 while injecting water jets simultaneously in two radially symmetrical directions from the injection nozzle (spout) 3c of the nozzle head 3. By moving the slide region 2b inserted into the notch recess 9a, the slide region 2b inserted into the notch recess 9a is pulled out of the notch recess 9a when performing the work of forming the groove-shaped notch 61 on the inner peripheral surface of the charging hole 60a. It is possible to avoid falling off and perform the work of forming the notch 61 in a stable state.

In this embodiment, a notch recess 9a is formed in the rotating body 9, and a sliding region 2b of the high-pressure water supply rod 2 by the sliding outer shell 4 is slidably attached to the notch recess 9a. However, instead of the notch recess 9a, a through hole having a rectangular cross section is provided through the rotary cylinder 9, and a structure is adopted in which the slide region 2b of the high-pressure water supply rod 2 is slidably inserted through the through hole. Also good. In this case, the retaining member 14 shown in FIG. 7 becomes unnecessary.

<Rotating adjustment means>
The rotation adjusting means 20 rotates the rotating body 9 around its rotation axis (axis center) C1, thereby rotating the high-pressure water supply rod 2 inserted through and supported by the rotating body 9 via the slide region 2b. The angle of the two injection ports 3c (see FIG. 10) opening in the nozzle head 3 attached to the tip of the high-pressure water supply rod 2, that is, the injection angle of the high-pressure water (water jet) injected from each injection port 3c. It has the function of finely adjusting and fixing the rotating body 9 at a predetermined rotation angle, and is configured as follows.

That is, as shown in FIGS. 4 and 5, the rotation adjustment means 20 includes a rotatable rotation operation shaft 21 arranged in a lateral direction perpendicular to the rotation axis C1 of the rotor 9, and A worm 22 provided and a worm wheel 9A provided on the rotating body 9 and meshing with the worm 22 are included. Here, the rotary operation shaft 21 has a plurality of bearings attached to a rectangular frame 11 and a cylindrical sleeve-shaped case 23 attached to the outer surface of the rectangular frame 11 at both ends in the axial direction (left and right ends in FIG. 4). It is rotatably supported by a (ball bearing) 24, and a handle 25 for manually rotating the rotary operation shaft 21 is attached to one axial end (left end in FIG. 4) extending from the case 23. . A screw member 26 is screwed to the upper part of the case 23 , and when the screw member 26 is turned, the tip of the screw member 26 is pressed against the rotary operation shaft 21 to rotate the rotary operation shaft 21 . is locked, the screw member 26 constitutes locking means capable of locking (fixing) the rotation of the rotary operation shaft 21 at a predetermined rotation angle.

In the rotation adjustment means 20 configured as described above, when the operator operates the handle 25 to rotate the rotation operation shaft 21 about the rotation axis (axis center) C2 (see FIG. 4), this rotation operation The rotation of the shaft 21 is transmitted to the rotating body 9 after changing its direction of rotation by 90° through the worm 22 and the worm wheel 9A that mesh with each other. ) and rotates around a rotation axis (axis center) C1. For this reason, the high-pressure water supply rod 2 inserted and supported in the notch recess 9a of the rotating body 9 via the sliding region 2b of the sliding outer shell 4, and the nozzle head 3 attached to the tip of the high-pressure water supply rod 2 form a rotating cylindrical body. 9 and finely adjusts the angular positions of the injection ports 3c (see FIG. 10) that open at two opposite locations in the radial direction of the nozzle head 3. As shown in FIG. Therefore, the injection direction of the high-pressure water (water jet) injected from each injection port 3c is finely adjusted. After finely adjusting the angular position of the injection port 3c of the nozzle head 3 in this manner, the screw member 26 is tightened to lock the rotation of the rotary operation shaft 21 so that the finely adjusted angular position of the injection port 3c is not changed. It becomes possible to fix at a predetermined angle.

<Lateral moving means>
The lateral movement means 30 integrally moves the rotation adjusting means 20 and the rotating body 9 in the lateral direction perpendicular to the rotation axis C1 of the rotating body 9, and is constructed as follows.

That is, the lateral movement means 30 includes a rotatable operation screw shaft 31 arranged in the lateral direction (horizontal direction in FIG. 4), and screwed into the operation screw shaft 31 so as to be able to move forward and backward, so that the rotating body 9 and the rotating body 9 are rotated. It comprises a nut member 32 which is laterally movable together with the adjustment means 20 . Here, the operation screw shaft 31 has its right and left ends mounted on bearing blocks 34 (only one side is shown in FIG. 4) erected on a horizontally elongated plate-like base 33 . It is rotatably supported by (ball bearing) 34a. A handle 35 for manually rotating the operation screw shaft 31 is attached to one axial end (right end in FIG. 4) extending outward from one bearing block 34 of the operation screw shaft 31 . A threaded member 36 is screwed to the upper portion of the bearing block 34 , and when the threaded member 36 is turned, the tip of the threaded member 36 is pressed against the operation screw shaft 31 . Since the rotation is locked, the screw member 36 constitutes locking means for locking the rotation of the operation screw shaft 31 .

At both ends of the base 33 in the horizontal direction, a total of four bearing blocks 37 (only one is shown in FIG. 4), two in the front and rear (perpendicular to the paper surface of FIG. 4), are erected. A round bar-shaped guide bar 38 is horizontally installed between a pair of bearing blocks 37 facing each other.

By the way, the nut member 32 is attached to the lower surface of the base 10 that supports the rotating body 9 and the rotation adjusting means 20, and the operation screw shaft 31 is screwed through the nut member 32 as described above. there is Guide blocks 39 are attached to four locations (only two locations are shown in FIGS. 4 and 5) on the lower surface of the base 10, and guide bars 38 are inserted through these guide blocks 39, respectively. ing. Therefore, the rotating body 9 and the rotation adjusting means 20 supported on the base 10 can move laterally while being guided by the front and rear guide bars 38 .

In the laterally moving means 30 configured as described above, when an operator operates the handle 35 to rotate the operating screw shaft 31, the nut member 32 screwed to the operating screw shaft 31 moves between the base 10 and the base 10. Together with the rotating body 9 and the rotation adjusting means 20 supported by the base 10, it moves laterally along two front and rear guide bars 38. As shown in FIG. Accordingly, the high-pressure water supply rod 2 inserted through and supported by the rotating body 9 via the sliding outer shell 4 also moves laterally together with the rotating body 9, and the nozzle head 3 attached to the tip of the high-pressure water supply rod 2 moves. The lateral position of (injection port 3c) is adjusted. When the lateral position of the nozzle head 3 (jetting port 3c) is adjusted in this way, the screw member 36 is tightened to lock the rotation of the operating screw shaft 31. The lateral position of the mouth 3c) is fixed and does not change.

<Vertical Movement Means and Horizontal Rotation Means>
The vertical movement means 40A vertically moves the rotor 9 and the rotation adjustment means 20 together with the horizontal movement means 30. The horizontal rotation means 40B moves the rotation body 9 and the rotation adjustment means 20 together. are rotated integrally in the circumferential direction around the vertical rotation axis C3 together with the lateral movement means 30, and are configured as follows.

4 and 5, the vertically moving means 40A and the horizontally rotating means 40B are composed of a vertical pole 41 supporting the rotating body 9, the rotating adjusting means 20 and the horizontally moving means 30, and a tunnel. A post 42 attached to a handrail 44 of a workbench (mancage) 81 (see FIG. 11) that is supported by a boom 80 of a drill jumbo, which is a heavy machine for construction work, and is capable of moving up, down, left, and right facing a face surface 51. The pole 41 is supported by a column 42 so as to be vertically movable and horizontally rotatable.

Here, the post 42 is composed of a vertically arranged cylindrical body portion 42A and flange portions 42B and 42C attached to the upper and lower ends of the body portion 42A, respectively. A laterally elongated plate-shaped column fixing seat 43 is attached by welding or the like. A pipe-shaped handrail 44 is provided on the man cage 81 supported by the boom 80 of the drill jumbo.

Therefore, by fixing both longitudinal ends (left and right ends in FIG. 4) of the support fixing seat 43 to the handrail 44 of the man cage 81 with U bolts 45 shown in FIG. It is attached to the handrail 44 of the workbench. A pole 41 is inserted through and supported by the center of the support 42 so as to be vertically movable and horizontally rotatable. Here, a lock mechanism 46 for locking vertical movement and horizontal rotation of the pole 41 is provided at the upper end of the support 42 . As also shown in FIG. 6, the lock mechanism 46 comprises a cylindrical fixed cylinder 46A fixed to the upper flange portion 42B of the post 42 and a slit portion 46a formed in a part of the fixed cylinder 46A. It is composed of a lock lever 46B that is screwed in a sandwiched manner. In this lock mechanism 46 , the pawl 41 is vertically moved and horizontally rotated together with the rotating body 9 , the rotation adjusting means 20 and the lateral moving means 30 , so that it is inserted through and supported by the rotating body 9 via the sliding outer shell 4 . After adjusting the height and horizontal rotation direction of the high-pressure water supply rod 2 and the nozzle head 3 attached to the tip thereof, the lock lever 46B is turned to reduce the diameter of the fixed cylinder 46A, and the fixed cylinder 46A is moved to the pole. By tightening the outer circumference of the pole 41, the vertical movement and horizontal rotation of the pole 41 are locked, and the pole 41 is held at the adjusted position.

[Method of Forming Notch]
Next, using the slide guide mechanism 1 for the high-pressure water supply rod configured as described above, from the injection nozzle 3c of the nozzle head 3 of the high-pressure water supply rod 2 inserted and supported in the notch recess 9a of the rotating body 9, At two points facing each other in the radial direction of the inner peripheral surface of a plurality of charging holes 60a (see FIGS. 1 and 2) formed in the peripheral portion of the face 51 of the tunnel 50 by the jetted water jet, A method of forming a groove-shaped notch 61 (see FIG. 2) by cutting in the direction along the excavation planning line 50a will be described.

In order to form the notch 61 , first, the boom 80 of the drill jumbo is driven to set the man cage 81 at a predetermined position facing the face 51 . After that, the slide region of the high-pressure water supply rod 2 by the sliding outer shell 4 is manually inserted into the cutout recess 9a of the rotating body 9 of the guide mechanism main body 5 attached to the handrail 44 of the man cage 81 by an operator. 2b is mounted from above through the opening surface portion 9a1 on the outer periphery of the rotating body 9, so that the high-pressure water supply rod 2 is aligned with the rotating shaft C1 of the rotating body 9, and the cutting of the rotating body 9 is performed. It is inserted into the recessed portion 9a so as to be slidable in the front-rear direction (perpendicular to the paper surface of FIG. 4). After inserting the slide region 2b of the high-pressure water supply rod 2 into the notch recess 9a, the retaining member 14 is attached to the outside of the slide region 2b across the opening surface portion 9a1 of the rotating body 9 in the width direction. To prevent the supply rod 2 from falling off from the guide mechanism main body 5 and the rotating body 9. - 特許庁

After inserting the sliding region 2b of the sliding outer shell 4 into the notch recess 9a and setting the high-pressure water supply rod 2 in the guide mechanism main body 5, for example, an operator manually moves the lateral movement means 30. , vertical movement means 40A and horizontal rotation means 40B, and by controlling the driving of the boom 80 of the drill jumbo to change the position and elevation angle of the man cage 81, the central axis of the high-pressure water supply rod 2 The direction and position of the high-pressure water supply rod 2 and the rotating body 9 are adjusted so that the center axis of the charging hole 60a is matched. After that, the nozzle head 3 guides the high-pressure water supply rod 2 to the charging hole 60a while sliding the sliding region 2b of the sliding outer shell 4 forward while guiding it to the notch recess 9a of the rotary cylinder 9. is manually pushed into the charging hole 60a up to the tip of the charging hole 60a. When pushing the high-pressure water supply rod 2 into the charging hole 60a, if the pushing of the high-pressure water supply rod 2 is blocked due to misalignment of the central axis, etc., the lateral movement means 30 or the vertical movement means is used. By further operating 40A and lateral rotating means 40B, or by appropriately changing the position, elevation angle, etc. of the man cage 81, the high-pressure water supply rod 2 can be manually moved until the nozzle head 3 reaches the tip of the charging hole 60a. It becomes possible to push it into the charging hole 60a by operation.

After the high-pressure water supply rod 2 is pushed into the charging hole 60a until the nozzle head 3 at the tip reaches the tip of the charging hole 60a (see FIG. 11), then preferably the notched cylinder of the rotating body 9 Using the indicator 13 attached to the body 9B as an index, the rotation adjustment means 20 is manually operated, so that the direction of the water jet ejected from the ejection port 3c of the nozzle head 3 is adjusted to the peripheral edge of the face surface 51. The angular position of the rotating body 9 is adjusted so that it faces in the direction along the planned excavation line 50a. That is, when the operator operates the handle 25 to rotate the rotary operating shaft 21 about the rotary shaft C2 (see FIG. 4), the rotation of the rotary operating shaft 21 causes the worm 22 and the worm wheel 9A that mesh with each other. , the direction of rotation is changed by 90° and transmitted to the rotating body 9, so that the rotating body 9 rotates around a rotation axis (axis center) C1 extending in the front-rear direction (perpendicular to the paper surface of FIG. 4). . As a result, the high-pressure water supply rod 2 and the nozzle head 3 attached to the tip of the high-pressure water supply rod 2 inserted and supported in the notch recess 9a of the rotating body 9 through the sliding region 2b of the sliding outer shell 4 are connected to the rotating body 9. The angular position of the injection port 3c (see FIG. 10), which rotates integrally with the nozzle head 3 and opens at two locations facing each other in the radial direction of the nozzle head 3, is finely adjusted. Further, by this, the injection direction of the water jets injected from the respective injection ports 3c is finely adjusted. After the angular position of the injection port 3c of the nozzle head 3 is finely adjusted in this way so that the injection port 3c faces the direction along the planned excavation line 50a on the peripheral edge of the face surface 51, the screw member 26 is tightened and rotated. By locking the rotation of the operating shaft 21, it becomes possible to fix the rotating body 9 at a predetermined angular position which is finely adjusted so that the injection port 3c faces the direction along the excavation planning line 50a.

According to the present embodiment, the injection port 3c of the nozzle head 3 of the high-pressure water supply rod 2 pushed into the charge hole 60a reaches the tip of the charge hole 60a, and the outlet 3c of the nozzle head 3 of the charge hole 60a After finely adjusting the direction along the excavation plan line 50a of the part and fixing the rotating body 9, the water jet is simultaneously injected from the injection port 3c of the nozzle head 3 in two radially symmetrical directions. Then, the high-pressure water supply rod 2 is moved at a predetermined speed from the charging hole 60a while being guided by the notch recess 9a of the fixed rotating body 9 and sliding backward in the sliding region 2b of the sliding outer shell 4. pull it out. As a result, groove-shaped cutout notches 61 for guiding cracks to occur in the direction along the planned excavation line 50a are formed at two radially opposed locations on the inner peripheral surface of the charging hole 60a. It is possible to easily form it in a state of being cut in the direction along.

Further, according to this embodiment, the guide mechanism main body 5 of the slide guide mechanism 1 has a compact shape that can be attached to the handrail 44 of the man cage 81 supported by the boom 80 of the drill jumbo. The high-pressure water supply rod 2 has a sliding surface 2c with a rectangular cross section formed by the sliding outer shell 4 on the outer peripheral portion of the sliding area 2b. It is provided with a cutout recess 9a having a sliding surface 9c on which the sliding surface 2c of the rectangular cross section of the slide region 2b of the high-pressure water supply rod 2 slides, and the slide region 2b of the high-pressure water supply rod 2 rotates. By being attached to the notch recess 9a of the body 9, it slides while being guided by the notch recess 9a. As a result, the manufacturing accuracy of the injection nozzle 3c and the nozzle head 3 is increased when the high-pressure water supply rod 2 is pulled out from the charging hole 60a while simultaneously injecting the water jet from the injection nozzle 3c in two radially symmetrical directions. For these reasons, even if the nozzle head 3 tries to rotate together with the high-pressure water supply rod 2 due to the injection of the water jet, the sliding surface 2c of the slide area 2b of the square cross section of the high-pressure water supply rod 2 and the notch of the rotating body 9 Such rotation can be effectively prevented by engaging with the sliding surface 9c of the square cross section of the concave portion 9a. It becomes possible to form the notch 61 with high precision in a state in which the cutout notch 61 is cut in the direction of the planned excavation line 50a in the peripheral portion of the face surface 51 .

Therefore, according to the slide guide mechanism 1 for the high-pressure water supply rod of the present embodiment, groove-shaped cuts are formed on the inner peripheral surface of the charging hole 60a arranged along the planned excavation line 50a on the peripheral edge of the face surface 51. When the notch 61 is formed by a water jet, the rotation of the nozzle head 3 can be prevented by a simple structure without requiring much labor by working on a workbench 81 supported by the boom 80 of the drill jumbo. The notch 61 is cut in the direction of the planned excavation line 50a at the peripheral edge of the face by making it possible to pull out the high-pressure water supply rod 2 while preventing it and stabilizing the injection direction of the water jet. In such a state, it becomes possible to form with high accuracy.

It should be noted that the present invention is not limited to the above embodiments, and various modifications are possible. For example, the sliding surface on which the sliding surface of the slide area of the high-pressure water supply rod slides does not necessarily have to be a cutout recess formed in the rotating body, and a rectangular cross-section formed in the rotating body. A through hole may be used. The sliding area of the high-pressure water supply rod does not necessarily have to have a sliding surface with a rectangular cross-section, but may have a sliding surface with a non-circular square cross-section such as a hexagon or an octagon. The cutout recesses and through-holes of the rotating body may serve as surfaces to be slid with various cross-sectional shapes that allow sliding on a sliding surface other than the rectangular cross-section of the slide region. Since the slide area of the high-pressure water supply rod is fitted with a sliding outer shell on the outer peripheral surface of the circular cross section, it is not always necessary to form a sliding surface with a rectangular cross section on the outer peripheral portion. , the high-pressure water supply rod itself may be provided with a sliding surface of square cross-section in the sliding area.

1 Slide guide mechanism for high-pressure water supply rod 2 High-pressure water supply rod (lance)
2b slide region 2c sliding surface 3 nozzle head 3c injection nozzle (spout)
4 Sliding outer shell 5 Guide mechanism body 6 Plate member 6a Curved recess 9 Rotating body 9a Notch recess 9a1 Opening surface 9c Sliding surface 9A Worm wheel 9B Notch cylinder 11 Rectangular frame 13 Pointer 14 Retaining member 20 Rotation adjustment means 21 Rotation operation shaft 22 Worm 25 Handle 26 Screw member 30 Lateral movement means 31 Operation screw shaft 32 Nut members 34, 37 Bearing block 35 Handle 36 Screw member 40A Vertical movement means 40B Lateral rotation means 41 Pole 42 Strut 44 Handrail 46 Lock mechanism 46B Lock lever 50 Tunnel 50a Excavation plan line 51 Face surface 60a Charge hole 61 Notch 80 Boom 81 of drill jumbo (heavy machine for tunnel construction) Mancage (workbench)
C1 Rotational axis of rotating body C2 Central axis of rotational operation axis C3 Vertical rotation axis

Claims (11)

In the mountain tunnel construction method, on the inner peripheral surface of a plurality of charge holes drilled at intervals along the planned excavation line on the periphery of the face, cracks are generated along the planned excavation line during blasting. When forming the guiding notch with a water jet, a high-pressure water supply rod having a nozzle head at the tip is ejected from the nozzle head with a water jet in a predetermined direction along the excavation plan line. A slide guide mechanism for a high-pressure water supply rod that guides the rod to slide in the axial direction of the hole,
The high-pressure water supply rod includes a guide mechanism main body attached to a workbench that is supported by heavy equipment for tunnel construction and is capable of moving up, down, left, and right while facing the face surface. A sliding surface with a non-circular rectangular cross section is provided on the outer peripheral portion of the sliding region, which is the portion that comes into slidable contact with the main body of the guide mechanism,
The main body of the guide mechanism has a notch recess or a through hole having a sliding surface on which the sliding surface of the square cross section of the slide area of the high-pressure water supply rod slides, and the high-pressure water supply rod. a rotating body whose slide region is slidably inserted into the notch recess or the through hole with the central axis aligned with the rotating shaft; rotating the rotating body about the rotating shaft; A slide guide mechanism for a high-pressure water supply rod, comprising rotation adjustment means capable of fixing the rotating body at a predetermined rotation angle. The sliding area of the high-pressure water supply rod has a rectangular cross-sectional sliding surface as a non-circular rectangular cross-section, and the cutout recess or through hole of the rotating body is a rectangular cross-sectional sliding surface of the sliding area. 2. A slide guide mechanism for a high-pressure water supply rod according to claim 1, further comprising a sliding surface on which the . In the sliding region of the high-pressure water supply rod, a sliding outer shell body forming a sliding surface with a non-circular rectangular cross section is integrally attached and fixed to the outer peripheral surface of the circular cross section, so that the outer peripheral portion: 3. A slide guide mechanism for a high pressure water supply rod according to claim 1 or 2, wherein the sliding surface has a non-circular square section. The sliding outer shell body is composed of a pair of plate members having, on the inner surface thereof, a curved recess having a shape along the outer peripheral surface of the high-pressure water supply rod and having a circular cross section. 4. The high-pressure water according to claim 3, wherein the pair of plate members are integrally connected with the slide area sandwiched therebetween to form a sliding surface with a non-circular rectangular cross-section on the outer peripheral portion of the slide area. Feed rod slide guide mechanism. The rotating body having the notched recess has an opening having a width similar to that of the notching recess on the outer peripheral surface thereof, and the sliding region is attached to the rotating body through the opening. 5. The high-pressure water supply according to any one of claims 1 to 4, wherein the high-pressure water supply rod is slidably inserted into the notch recess with the center axis of the high-pressure water supply rod aligned with the rotation axis of the rotating body. Rod slide guide mechanism. 6. The high-pressure water supply rod according to claim 5, wherein a retaining member is attached to the outside of said slide area of said high-pressure water supply rod inserted into said cutout recess so as to traverse said opening in the width direction. Slide guide mechanism. The rotation adjustment means includes a rotatable rotation operating shaft arranged in a lateral direction perpendicular to the rotation axis of the rotating body, a worm provided on the rotating operating shaft, and the worm provided on the rotating body. A slide guide mechanism for a high-pressure water supply rod according to any one of claims 1 to 6, comprising a worm wheel that meshes with the worm wheel. Lateral moving means for moving the rotation adjusting means and the rotating body together in a lateral direction perpendicular to the rotation axis of the rotating body, and vertical moving means for vertically moving the lateral moving means; A slide guide for a high-pressure water supply rod according to any one of claims 1 to 7, further comprising laterally rotating means for rotating said laterally moving means in a circumferential direction around a vertical rotation axis. mechanism. The lateral movement means includes a rotatable operation screw shaft arranged in a lateral direction perpendicular to the rotation axis of the rotor, and a rotatable operation screw shaft that is screwed forward and backward to adjust the rotation of the rotor and the rotation. 9. A sliding guide mechanism for a high-pressure water supply rod according to claim 8, comprising a nut member laterally movable together with the means. The vertical moving means and the horizontal rotating means are fixed to the rotating body, the rotation adjusting means, and the pole member for supporting the horizontal moving means, and to the workbench of the heavy machine for tunnel construction. 9. A slide guide mechanism for a high-pressure water supply rod according to claim 8, further comprising a strut member supporting said pole member so as to be vertically movable and laterally rotatable. 11. A slide guide for a high-pressure water supply rod according to claim 10, wherein said vertical movement means and said horizontal rotation means are provided with a lock mechanism for locking vertical movement and horizontal rotation of said pole member on said strut member. mechanism.

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