JP5091014B2 - Spraying equipment - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a spraying device used for spraying concrete construction when excavating a mountain tunnel, and more specifically, spraying concrete construction using the rotational force of a spraying impeller (blow projection method) without using compressed air. The present invention relates to an airless spraying device that enables the

A spraying method is generally used for placing concrete, which is the main supporting member during mountain tunnel excavation. In this spraying method, base concrete and rapid setting agent are pumped by different routes through separate transport pipes, and both are merged and mixed in the middle of the pumping, and then sprayed from the tip of the spray nozzle to the ground during tunnel excavation. ing. In addition, compressed air is generally used for pumping the base concrete and the quick setting agent (see Patent Document 1).
In such a conventional concrete spraying method, concrete and a rapid setting agent are pumped with compressed air, and a powder rapid setting agent is used as the rapid setting agent. However, since a large amount of compressed air is used, a large amount of dust is used. There was a problem that occurred.

Therefore, in the past, in order to avoid the generation of dust, the rotational force method (blow projection method) is used for concrete pumping / projection, and the projection is performed without using compressed air. I can plan.
Such an airless spraying method does not use compressed air for projecting concrete, but hits and projects concrete by rotating an impeller with a striking blade at high speed. Moreover, compressed air is used for projecting concrete. Since it is not used, it is ensured that the dust concentration is 3 mg / m ³ or less near the face and 2 mg / m ³ or less at a point 50 m away from the face. In this case, a slurry quick setting agent is used as the quick setting agent.

As shown in FIGS. 17 (a) and 17 (b), this type of conventional impeller with a striking blade is rotatably supported in the casing 1 and provided coaxially at a predetermined interval. An impeller body 2 having a pair of blade support disks 2a, and a plurality of, for example, four striking blades 3 positioned between the pair of blade support disks 2a and mounted on the blade support disks 2a. The four striking blades 3 are arranged radially at an angle of 90 degrees with respect to the circumferential direction of the blade support disk 2a.
The striking blade 3 is mounted on a base member 3a that is sandwiched between a pair of blade support disks 2a and a blade installation step 3b that is formed near the periphery of the blade support disk 2a of the base member 3a. And a blade 3c made of super hard metal. The blade installation step 3b faces the rotation direction of the impeller body 2 shown in FIG. 17A (the direction of arrow A: the tangential direction in contact with the outer peripheral surface of the blade support disk 2a) and the circumferential direction of the impeller body 2. It is formed as follows. The concrete striking surface 3c1 of the blade 3c is directed in the direction of rotation of the impeller body 2 (direction of arrow A), and the concrete striking surface 3c1 is perpendicular to the direction of rotation of the impeller body 2 (direction of arrow A). It has a flat surface.
When the impeller body 2 with a striking blade having such a configuration is rotated at a high speed in the direction of arrow A shown in FIG. 17 (a), the base concrete pressed into the housing 1 from the inlet 4 and the powder quick setting agent The mixture is hit by the blade 3c of the hitting blade 3, and is projected from the projection port 5 toward a natural ground or the like during tunnel excavation.
JP 2007-177495 A

  However, in the conventional impeller with a striking blade as described above, the concrete striking surface 3c1 of the blade 3c is formed on a flat surface perpendicular to the rotation direction of the impeller body 2 (direction of arrow A). As shown in FIG. 18, the shotcrete 6 projected from the projection port 5 toward the natural ground or the like has a projection angle that is greatly diffused in a fan shape as it goes forward. As a result, compared to air spraying, the projection diffusion angle of the concrete is widened, and the gap between the support work 7 and the ground 8 is sprayed as shown in FIG. 16 until the back of the support work 7 is filled with concrete. There was a problem that the concrete was blocked by the concrete 6a, and the concrete was not completely filled into the back of the support.

  The present invention has been made to solve the conventional problems as described above, and can reduce the projection diffusion angle of the concrete and increase the projection distance of the shotcrete, and also reduce the generation of dust. An object of the present invention is to provide an airless spraying device.

In order to achieve the above object, a spraying device according to the present invention includes an impeller body, a casing that rotatably accommodates the impeller body, and a charging port provided at a location of the casing facing the outer periphery of the impeller body. A blown concrete projecting port provided at a location different from the charging port at a location facing the outer periphery of the impeller body of the casing, and a plurality of striking blades mounted on the impeller body, The blade has a concave shotcrete receiving portion that receives the concrete thrown in from the feed port and projects the concrete from the shotcrete projection port to the outside of the casing with a striking force generated by rotation of the impeller body. The shotcrete receiving part opens to the outer periphery of the impeller body and opens to the concrete. And a concrete projection opening that opens toward a rotation direction of the impeller body in a tangential direction passing through an outer peripheral portion of the impeller body where the concrete charging opening is located, and the shotcrete receiving portion includes the concrete A bottom surface that receives the concrete that is input from the input opening; and a striking surface that projects the concrete received from the bottom surface from the concrete projection opening, and the striking surface is in a direction parallel to the rotation center axis of the impeller body. The distance between the striking surface and the concrete projection opening is the largest value at the center in the width direction of the striking surface and the smallest value at both ends in the width direction. is, the bottom surface and is orthogonal to the said striking face, the height from the bottom surface of the striking face, a large central portion in the width direction is most A flat center extending in a direction parallel to the rotation center axis of the impeller body at a central portion in the width direction. It is comprised by the surface and the flat inclined surface of the both sides which reach the said concrete projection opening, mutually separating from the both sides of the said center surface, It is characterized by the above-mentioned.

  According to the spraying apparatus of the present invention, the concrete receiving portion of the striking blade has a bottom surface that receives the concrete that is input from the concrete charging opening, and a striking surface that projects the concrete received at the bottom surface from the concrete projection opening. The striking surface has a width along a direction parallel to the central axis of rotation of the impeller body, and the distance between the striking surface and the concrete projection opening is the largest value at the center of the striking surface in the width direction. Since both ends in the width direction are formed with the smallest value, it is possible to concentrate the projected concrete in the center, and accordingly, the projection diffusion angle of the concrete can be made smaller than before and shotcrete Projecting distance can be increased, the concrete filling ability to the back of the support can be improved, and the generation of dust can be reduced.

(Embodiment 1)
Embodiments of a spraying apparatus according to the present invention will be described below with reference to the drawings.
In addition, the spraying apparatus concerning this invention is not limited to embodiment described below.
FIG. 1 is an overall configuration diagram in which a part of the spraying device in the first embodiment is cut out, and FIG. 2 is a diagram in which a part of a casing used in the spraying device in the first embodiment is cut out. FIG. 3 is a right side view of the impeller with a striking blade used in the spraying device according to the first embodiment, and FIG. 4 is a plan view of an example of the striking blade according to the present invention. 5 is a right side view of FIG. 4, FIG. 6 is a left side view of FIG. 4, FIG. 7 is a cross-sectional view taken along line 7-7 of FIG. 4, and FIG. It is.

As shown in FIG. 1, the spraying device 10 in the present embodiment includes an impeller body 11, a casing 12, a drive mechanism 13, a concrete pumping means 14, a quick setting agent supply means 15, a striking blade 16, and the like. The
As shown in FIGS. 1 and 3, the impeller body 11 has a pair of blade support disks 112 provided on the same hollow shaft 111 at a predetermined interval, and the peripheral edges of the both blade support disks 111. Each part is provided with an impeller ring 113 in which a hard metal layer 113a is laminated on the inner wall surface.
The casing 12 accommodates the impeller body 11 in a rotatable manner, and a drive mechanism 13 formed of a hydraulic motor or the like is assembled at the center of one side surface of the casing 12. As shown in FIG. 1, the drive shaft 131 of the drive mechanism 13 is fitted to the hollow shaft 111 of the blade support disc 112.

As shown in FIGS. 1 and 2, the casing 12 has a hollow disk shape corresponding to the outer shape of the impeller body 11 and is configured to be divided into two on the surface including the diameter. The divided half casings 12a and 12b are slidably connected by a boss part 122 projecting from one end in the diameter direction of the half casings 12a and 12b, and a hinge pin 123 connecting the boss parts 122, respectively. Furthermore, a connecting bolt 124 for integrating the half casings 12a and 12b is provided at the other end in the diameter direction of the half casings 12a and 12b.
One charging port 125 for sprayed concrete is provided at a portion of the casing 12 facing the outer periphery of the impeller body 11, and the inner wall surface of the charging port 125 is covered with a hard metal layer.
In addition, one end of the concrete pressure feeding pipeline 17 is connected to the insertion port 125. A concrete pumping means 14 for pumping sprayed concrete is connected to the other end of the concrete pumping conduit 17.
Further, in the middle of the concrete pumping line 17, quick setting agent supply means 15 for mixing a slurry-like quick setting agent into the concrete in the concrete pumping pipe 17 is connected via a Y-shaped pipe 18.
In addition, a sprayed concrete projection port 19 is provided at a location spaced apart from the charging port 125 facing the outer periphery of the impeller body 11 of the casing 12 in the rotation direction of the impeller body 11 (in the direction of arrow A in FIG. 3).

The striking blade 16 receives the shotcrete mixed with the slurry-like rapid setting agent introduced from the inlet 125, and projects the shotcrete with the hitting force generated by the rotation of the impeller body 11. A plurality of projections for projecting from the opening 19 to the outside of the casing 12 are provided. In this embodiment, four are provided.
As shown in FIGS. 1 and 3, the four striking blades 16 are positioned between a pair of blade support disks 112 and attached to the impeller body 11. Specifically, the blade support blades The circular plates 112 are arranged radially at an angle of 90 degrees with each other in the circumferential direction.

  Further, as shown in FIGS. 1, 3 and 4 to 8, the striking blade 16 includes a base member 161 disposed in a sandwiched state between a pair of blade support disks 112, and a pair of the base members 161. Rotation of the impeller body 11 on the mounting bolt 162 fixed to the fixing portion 112a provided in a passing state between the blade support disks 112 and the step portion 163 formed near the outer periphery of the impeller body 11 of the base member 161 As shown, the blade member 164 made of super hard metal is mounted so as to face the injection concrete projecting port 19 in order from the charging port 125.

As shown in FIGS. 3 and 4 to 8, the blade member 164 receives the shotcrete thrown in from the inlet 125 and projects the shotcrete with shotting force generated by the rotation of the impeller body 11. A concave shotcrete receiving portion 165 that projects from the mouth 19 to the outside of the casing 12 is provided.
This shotcrete receiving part 165 rotates the impeller body 11 in the direction of a tangential line L2 passing through the outer periphery of the impeller body 11 where the concrete introduction opening 165A is located, and the concrete insertion opening 165A that opens toward the outer periphery of the impeller body 11. It has a concrete projection opening 165B that opens in the direction (the direction of arrow A). Further, the shotcrete receiving portion 165 has a bottom surface 165C (the bottom surface 165C is formed by a step portion 163 of the base member 161) for receiving the concrete charged from the concrete charging opening 165A, and the concrete received by the bottom surface 165C is made into concrete. A striking surface 165D that projects from the projection opening 165B.
The striking surface 165D has a width d along the direction parallel to the rotation center axis of the impeller body 11, and the distance p between the striking surface 165D and the concrete projection opening 165B is a central location in the width d direction of the striking surface 165D. Is the largest value, and both ends in the width d direction are formed with the smallest value. Thereby, as shown in FIGS. 4 and 8, the striking surface 165D includes a central surface 165D-1 extending in a direction parallel to the rotation center axis of the impeller body 11 at the central portion in the width d direction, and the central surface. The shape in plan view, which is composed of the inclined surfaces 165D-2 on both sides reaching the concrete projection opening 165B while being separated from each other from both sides of 165D-1, has a trapezoidal concave shape.
Further, the height h from the bottom surface 165C of the striking surface 165D is configured such that the central portion in the width d direction has the largest dimension and decreases as it goes to both ends in the width d direction facing the concrete projection opening 165B. Yes.

In the spraying device 10 according to the present embodiment configured as described above, the impeller body 11 with the striking blade 16 is rotated at a high speed, for example, at a speed of 2500 rpm in the direction of arrow A shown in FIG. The shotcrete was pumped from the concrete pumping means 14 to the inlet 125 of the casing 12 through the concrete pumping pipe 17 and supplied to the concrete pumping pipe 17 from the quick setting agent supplying means 15 through the Y-shaped pipe 18. The slurry-like quick setting agent is mixed with the concrete in the concrete pressure-feeding conduit 17 and is pressure-fed toward the inlet 125.
And the mixture of the base concrete extruded from the charging port 125 of the casing 12 and the quick setting agent is sequentially put into the sprayed concrete receiving part 165 of the blade member 164 that rotates integrally with the impeller body 11, and this mixture is further added. The concrete is a striking force generated by the rotation of the impeller body 11 and is moved toward the central surface 165D-1 side along the inclined surface 165D-2 of the shot concrete receiving portion 165 and from the shot concrete projection port 19 to the outside of the casing 12. Projected to. As a result, concrete can be placed on a natural ground or the like during tunnel excavation.
In this case, the projection diffusion angle of the shotcrete 20 projected from the shotcrete projection port 19 is small as shown in FIG. 9 and becomes a substantially linear projection form, as compared with the conventional one shown in FIG. The projection diffusion angle of concrete can be greatly reduced. As a result, the concrete can be reliably sprayed and filled into the gap between the support work 7 and the ground 8 and the back of the support work 7.

  Therefore, according to the present embodiment, the shot concrete receiving portion 165 of the striking blade 16 has the bottom surface 165C that receives the concrete input from the concrete input opening 165A, and the concrete received by the bottom surface 165C from the concrete projection opening 165B. The impact surface 165D has a width d along the direction parallel to the rotation center axis of the impeller body 11, and the distance p between the impact surface 165D and the concrete projection opening 165B is an impact. Since the central part in the width d direction of the surface 165D is formed with the largest value and the both ends in the width d direction are formed with the smallest value, it becomes possible to concentrate the projected concrete in the center. In addition, the projection diffusion angle of shotcrete can be reduced while the projection diffusion angle of concrete can be made smaller than before. Can be increased, can improve the filling of the concrete into shoring back, it is possible to reduce the generation of dust together.

(Embodiment 2)
Next, another example of such striking blade herein by FIGS. 10 to 12.
Figure 10 is a plan view of a striking blade in the second embodiment, FIG. 11 is a right side view of FIG. 10, FIG. 12 is a left side view of FIG. 10, FIG. 13 is a sectional view taken along line 13-13 in FIG. 10 is there.
The striking blade 30 shown in the second embodiment has a base member 301 and a stepped portion 302 formed near the outer periphery of the impeller main body of the base member 301 as the impeller main body rotates as in the first embodiment. A blade member 303 made of cemented carbide is mounted so as to face the shot concrete injection port in order from the charging port of the casing.
As in the first embodiment, the blade member 303 receives the shotcrete thrown from the inlet of the casing and receives the shotcrete from the shotcrete projection port by the striking force generated by the rotation of the impeller body. It has a concave shotcrete receiving part 304 that projects out of the casing.
In the same manner as in the first embodiment, the shotcrete receiving portion 304 has a concrete input opening 304A that opens toward the outer periphery of the impeller body, and a direction of a tangent line that passes through the outer periphery of the impeller body where the concrete input opening 304A is located. And a concrete projection opening 304B that opens in the direction of rotation of the impeller body (in the direction of arrow A). Furthermore, the shotcrete receiving portion 304 has a bottom surface 304C (the bottom surface 304C is formed by the stepped portion 302 of the base member 303) for receiving the concrete charged from the concrete charging opening 304A, and the concrete received at the bottom surface 304C. A striking surface 304D that projects from the projection opening 304B.

Like the first embodiment, the striking surface 304D has a width d along the direction parallel to the rotation center axis of the impeller body, and the distance p between the striking surface 165D and the concrete projection opening 165B is the striking surface 165D. The center portion in the width d direction is the largest value, and the both ends in the width d direction are the smallest values. Thereby, as shown in FIG. 10, the striking surface 304 </ b> D has a central surface 304 </ b> D- 1 extending in a direction parallel to the rotation center axis of the impeller body at the central portion in the width d direction, The two-sided inclined surfaces 304D-2 that reach the concrete projection openings 304B while being separated from each other from each other have a trapezoidal concave shape in plan view, and the height h of the striking surface 304D from the bottom surface 304C is The central portion in the width d direction has the largest dimension and is configured to decrease toward both ends in the width d direction facing the concrete projection opening 304B.
In the second embodiment, the difference from the first embodiment is that the projecting length of the striking surface 304D of the shotcrete receiving part 304 in the direction of the concrete projection opening 165B is larger than that in the first embodiment. It is in.
In the second embodiment, the same effect as that shown in the first embodiment can be obtained.

(Reference Example 1)
Next, Reference Example 1 will be described with reference to FIGS.
FIG. 14 is a plan view of the striking blade in Reference Example 1 , and FIG. 15 is a perspective view of the striking blade in Reference Example 1 .
The striking blade 40 shown in Reference Example 1 is different from the first and second embodiments in that the blade member 403 mounted on the step portion 402 formed near the outer periphery of the impeller body of the base member 401 is As in the first embodiment, the striking surface 404D of the shot concrete receiving portion 404 of the cemented carbide blade member 403 mounted so as to face the shot concrete injection port in order from the casing inlet as the impeller body rotates. It is in a place that is formed in an arc shape.
Similarly to the first embodiment, the shotcrete receiving portion 404 includes a concrete charging opening 404A that opens toward the outer periphery of the impeller body, and a concrete projection opening 404B that opens toward the rotation direction of the impeller body. . Further, the stepped portion 402 constitutes the bottom surface of the shotcrete receiving portion 404.
In the third embodiment, the same effect as that shown in the first embodiment can be obtained.

( Reference Example 2 )
Next, Reference Example 2 will be described with reference to FIG.
FIG. 16 is a plan view of a striking blade in Reference Example 2. FIG.
The striking blade 50 shown in the reference example 2 is different from the first and second embodiments in that the braided metal blade is mounted on the stepped portion 502 formed near the outer periphery of the impeller body of the base member 501. The striking surface 504D of the shot concrete receiving portion 504 of the blade member 503 mounted on the member 503 so as to face the shot concrete injection port in order as the impeller main body rotates in the same manner as in the first embodiment. It is located in a semicircular arc shape.
Similarly to the first embodiment, the shotcrete receiving portion 504 has a concrete charging opening 504A that opens toward the outer periphery of the impeller body and a concrete projection opening 504B that opens toward the rotation direction of the impeller body. . Further, the step portion 502 constitutes the bottom surface of the shotcrete receiving portion 404.
Also in Reference Example 2 as described above, the same effect as that shown in the first embodiment can be obtained.

  Note that the present invention is not limited to the configuration described in the above embodiment, and can be variously modified without departing from the technical scope described in the claims.

It is the whole block diagram which notches and shows a part of spraying apparatus in this Embodiment 1. FIG. It is a right view which cuts and shows a part of casing used for the spraying apparatus in this Embodiment 1. FIG. It is a right view which cuts and shows a part of impeller with a striking blade used for the spraying apparatus in this Embodiment 1. FIG. It is a top view which shows an example of the striking blade in this invention. FIG. 5 is a right side view of FIG. 4. FIG. 5 is a left side view of FIG. 4. It is sectional drawing which follows the 7-7 line | wire of FIG. FIG. 3 is a perspective view of a striking blade in the first embodiment. It is explanatory drawing of the spraying apparatus in this Embodiment. FIG. 10 is a plan view of a striking blade in the second embodiment. It is a right view of FIG. It is a left view of FIG. It is sectional drawing which follows the 13-13 line | wire of FIG. 5 is a plan view of a striking blade in Reference Example 1. FIG. 5 is a perspective view of a striking blade in Reference Example 1. FIG. 10 is a plan view of a striking blade in Reference Example 2. FIG. (A) is explanatory drawing of the conventional spraying apparatus, (b) is a right view of the striking blade in the conventional spraying apparatus. It is explanatory drawing of the spraying apparatus in the past.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Spraying device, 11 ... Impeller main body, 112 ... Blade support disk, 12 ... Casing, 125 ... Loading port, 13 ... Drive mechanism, 14 ... Concrete pressure feeding means, 15 ... Quick setting Agent supplying means, 16 ... striking blade, 161 ... base member, 164 ... blade member, 165 ... shotcrete receiving part, 165C ... bottom, 165D ... striking surface, 17 ... concrete pressure feeding line, 19 …… Concrete projection port, 30 …… Blow blade, 301 …… Base member, 303 …… Blade member, 304 …… Spring concrete receiving portion, 304C …… Bottom, 304D …… Blow surface, 40 …… Blow blade , 401... Base member, 402... Stepped portion, 403... Blade member, 404 .. Shotcrete receiving portion, 404D. Blade, 501 ...... base member, 503 ...... blade member, 504 ...... shotcrete receiving, 504D ...... striking surface.

Claims (6)

The impeller body,
A casing for rotatably housing the impeller body;
An insertion port provided at a location facing the outer periphery of the impeller body of the casing;
A shotcrete projection port provided at a location different from the charging port at a location facing the outer periphery of the impeller body of the casing;
A plurality of striking blades mounted on the impeller body,
The striking blade has a concave shotcrete receiving portion that receives the concrete thrown in from the slot and projects the concrete from the shotcrete projection to the outside of the casing with a striking force generated by the rotation of the impeller body. Have
The shotcrete receiving part is directed toward the rotation direction of the impeller body in a tangential direction passing through a concrete charging opening that opens toward the outer periphery of the impeller body and an outer peripheral portion of the impeller body where the concrete charging opening is located. Having a concrete projection opening to open,
Furthermore, the shotcrete receiving portion has a bottom surface that receives the concrete that is input from the concrete input opening, and a striking surface that projects the concrete received at the bottom surface from the concrete projection opening,
The striking surface has a width along a direction parallel to the rotation center axis of the impeller body,
The distance between the striking surface and the concrete projection opening is formed with the largest value at the center in the width direction of the striking surface and the smallest value at both ends in the width direction ,
The bottom surface and the striking surface are orthogonal to each other, and the height of the striking surface from the bottom surface is such that the central portion in the width direction has the largest dimension and decreases toward both ends in the width direction. Configured,
The striking surface includes a flat central surface extending in a direction parallel to the rotation center axis of the impeller body at a central portion in the width direction, and both sides reaching the concrete projection opening while being separated from both sides of the central surface. It consists of a flat inclined surface,
A spraying device characterized by that. The impeller body has a pair of blade support disks provided coaxially at a predetermined interval, and the striking blade is attached to the impeller body by being sandwiched between the pair of blade support disks. The spraying device according to claim 1 , wherein the spraying device is provided. The striking blade has a base member sandwiched between the pair of blade support disks, and a blade member attached to a portion of the base member near the outer periphery of the impeller body,
The spraying device according to claim 2, wherein the sprayed concrete receiving portion is formed at a position of the blade member positioned forward in the rotation direction of the impeller body. 4. The spraying device according to claim 3, wherein the blade member is made of a hard metal. It said plurality of striking blade, spraying device according to any one of the claims 2 to 4, characterized in that it is arranged radially at a predetermined angle in the circumferential direction of the blade support disk . A drive mechanism for rotating the impeller body;
Concrete pumping means for pumping sprayed concrete connected to the inlet through a concrete pumping pipeline;
A quick setting agent supplying means for mixing the quick setting agent in the concrete in the concrete pressure sending pipe connected to the middle of the concrete pressure sending pipe;
Spraying device according to any one of the claims 1 to 5, further comprising a.

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