JP2012167422A - Mortar spraying machine and repair or reinforcement method for concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mortar spraying machine capable of reducing burden on an operator and having excellent workability; and a repair or reinforcement method for concrete structure having excellent workability.SOLUTION: A mortar spraying machine for projecting mortar forward from a projection opening 24 installed at the front of a casing 20 by an impeller 11 is provided with a first grip portion 36 to be gripped by one hand of an operator and a second grip portion 40 to be gripped by the other hand of the operator which are installed at both sides of the casing 20. The first grip portion 36 with a rotation axis of the impeller 11 on the side elongated sideward extends backward beyond the rear end of the casing 20, and a drive shaft 57 extending backward from the tip of the rotation axis is connected to the tip of the rotation axis through a direction conversion transmission mechanism, and a motor 35 for driving the drive shaft 57 is built in the first grip portion 36. In the second grip portion 40, the center of a second holding portion 40a in a lengthwise direction is set to be in the projection range of the casing 20 in a side view.

Description

  The present invention relates to a mortar spraying machine for spraying mortar on a repair / reinforcement portion or the like of a concrete structure, and a concrete structure repairing or reinforcing method using the mortar spraying machine.

  When an accident occurs in which concrete is peeled off from a concrete structure such as a tunnel or viaduct, work is being carried out to repair and reinforce the peeled portion with repair / reinforcement material such as mortar. Conventional methods of repair and reinforcement work include “plamber finish” in which mortar is applied with a plastering iron, and “spraying with compressed air” in which mortar is blown out with compressed air.

  However, since plastering is done manually by the worker using a plastering iron, if the repair / reinforcement point is facing down, such as the ceiling of a tunnel, the worker is facing up. In addition to the problem that the work efficiency has to be reduced, there is a problem that the adhesion of the mortar to the repaired / reinforced part is lowered due to the influence of gravity.

  In addition, since blowing with compressed air uses a large amount of compressed air, a large compressor is required, and a large amount of fine mortar-containing dust is generated. In a bad place, there was a problem that the working environment deteriorated. In addition, advanced technology is necessary to adjust the compressed air at the nozzle tip, and in addition, repair and reinforcement work is not required while moving many equipment such as mixers, hoppers with agitators, mortar pumps, and compressors. There is also a problem that the work efficiency is low because it must not be complicated.

  Therefore, as an alternative to plastering and blowing with compressed air having the above problems, a method using a mortar spraying machine that projects and sprays mortar with centrifugal force of an impeller that rotates at high speed is Patent Document 1, 2.

  The mortar spraying machine described in Patent Document 1 supplies an impeller that rotates at high speed around an axis, a casing that surrounds the impeller at an interval, and a mortar that is provided in the casing toward the rotation center of the impeller. In the mortar spraying machine including a mortar supply pipe, the impeller includes two impeller rings spaced apart in the axial direction of the rotating shaft, and a plurality of blades attached at intervals in the circumferential direction therebetween. The casing has a projection port provided adjacent to the mortar supply pipe so as not to directly contact the mortar projected by the impeller.

  The mortar sprayer described in Patent Document 2 is an impeller that is rotatable about an axis, a casing that rotatably supports the impeller and that surrounds an outer surface thereof with a space therebetween, and is attached to the casing. A mortar supply pipe for supplying mortar toward the rotation center of the impeller, a rotation shaft that supports the impeller at one end and can rotate around the shaft center, and is attached to a casing and rotatably supports the rotation shaft. A spraying machine main body having a bearing to be mounted, and a coupling to which the flexible shaft is detachably attached to the other end of the rotary shaft, and the impeller positioned to be spaced apart from the spraying machine main body for rotationally driving the impeller And an elongated flexible shaft having a flexibility for connecting the impeller and the drive motor and transmitting a rotational driving force. It was intended to be.

  According to the construction methods described in Patent Documents 1 and 2, since a large amount of dust is not generated as in the case of spraying with compressed air, the work environment is not deteriorated. In addition, the adhesion of the mortar to the repaired / reinforced parts did not decrease as with plastering.

Japanese Patent No. 3802816 Japanese Patent No. 4296235

  However, in the mortar sprayer 90 described in Patent Document 1, the impeller drive motor 91 is located directly beside the casing 92 (on the extension line T of the axis of the impeller rotation shaft), as shown in FIG. Therefore, the drive motor 91 must be supported at a position away from the body, and the burden on the supporting worker (particularly the hand) is large, and it has been difficult to use it for a long time.

  The mortar spraying machine described in Patent Document 2 separates the impeller drive motor from the main body part of the mortar sprayer, so that the main body part of the mortar sprayer is slightly lighter (instead of supporting the drive motor, it is flexible. However, the workability was poor because the drive motor had to be carried on the back.

  Therefore, the present invention aims to provide a mortar sprayer that reduces the burden on the worker and has good workability, and also provides a repair or reinforcement method for a concrete structure with good workability. .

  In order to solve the above-mentioned problems, a mortar sprayer according to the present invention supplies mortar into a casing and projects the mortar forward from a projection opening provided on the front side of the casing by an impeller that rotates in the casing. In the mortar spraying machine, a first handle part for an operator to hold with one hand and a second handle part for holding with the other hand are provided on both left and right sides of the casing, and the rotating shaft of the impeller The first handle portion on the side extending sideways extends rearward beyond the rear end of the casing, and a direction changing transmission mechanism is provided at the front end portion of the rotating shaft with a drive shaft extending rearward from the front end portion. And a motor for driving the drive shaft is incorporated in the first handle portion, and the second handle portion has a projection range of the casing as viewed from the side in the center in the length direction of the second grip portion to be gripped. In And characterized in that a thing.

  By holding the first handle with one hand, the motor can be supported at a position close to the body, and by holding the second handle with the other hand, a position close to the casing can be supported. This can reduce the burden on the operator.

  Although it is not particularly limited as the first handle part, the operator can firmly grasp the first handle part and can support the mortar sprayer by contacting the rear end to the body, so that it exceeds the rear end of the casing. It is preferable that it extends 10 to 40 cm rearward. In addition, the shape of the first gripping part gripped by the first handle part is not particularly limited, but is preferably a cylindrical shape having a diameter of 50 to 60 mm because the operator can easily grip it. In addition, since the load on the body can be reduced by reducing the pressure on the body when the rear end is in contact with the body and supporting the mortar sprayer, the pressure when the operator is contacted is reduced. It is preferable to provide a buffer at the rear end. Although it does not specifically limit as a material of a buffer body, A bubble buffer material etc. can be illustrated.

  In the first handle portion, the position where the motor is built is not particularly limited, but since the burden on the operator becomes smaller, the majority of the motor more than 80% by mass is behind the rear end of the casing. It is preferable to be a position where 90% by mass or more of the motor is located behind the rear end of the casing.

  Although it does not specifically limit as a 2nd handle part, The thing which the 2nd holding | grip part extends to the side of a casing, the thing extended to the front-back direction, an up-down direction, or the diagonal direction at the side of a casing can be illustrated. The shape of the second handle portion when the second grip portion extends in the front-rear direction, the up-down direction, or the oblique direction on the side of the casing is not particularly limited, but the second grip portion is curved or bent to the side of the casing. An arch shape projecting in the direction, a T-shape composed of a rod-shaped second gripping portion extending along the side surface of the casing and a rod-shaped connecting portion extending from the middle in the length direction of the second gripping portion to the casing, etc. it can. In addition, the position where the second gripping portion is provided is not particularly limited, but the position on the virtual extension line of the rotation axis (virtual line obtained by extending the axis of the rotation axis) or the front of the virtual extension line of the rotation axis. The position, the position behind the virtual extension line of the rotation axis, and the like can be exemplified. Since the inclination of the casing to the side can be suppressed, it is preferable that the second handle portion has the second grip portion extending on a virtual extension line of the rotation shaft to the side of the casing.

  The mortar sprayer is preferably provided with a third handle portion that extends downward from the casing, because support when spraying the mortar upward is facilitated and the burden on the operator is reduced.

  Although it does not specifically limit as an aspect of a casing, The aspect etc. in which the mortar supply pipe which supplies mortar toward the rotation center of an impeller are provided can be illustrated. Moreover, although the opening part of the casing for supplying mortar is not specifically limited, Since it becomes difficult to clog a mortar, it is preferable that it is an oblong or elliptical opening long in the circumferential direction of a casing.

  The mortar supply pipe is not particularly limited, but since the mortar can be supplied without clogging, it has a tubular shape that is reduced in diameter from the rear end to the intermediate portion in the length direction and bent at an obtuse angle from the intermediate portion to the front end. It is preferable.

  Although it does not specifically limit as a direction change transmission mechanism, A bevel gear, a universal joint, etc. can be illustrated.

  Although it does not specifically limit as a motor, An electric motor, an air motor, etc. can be illustrated.

  The impeller mode is not particularly limited. However, since the spot property in the width direction is improved, two impeller rings spaced apart in the axial direction of the rotating shaft and the circumferentially spaced distance between them are attached. An embodiment comprising a plurality of blades is preferable.

  In order to solve the above-described problems, the concrete structure repair or reinforcement method of the present invention uses the above-described mortar sprayer to perform repair or reinforcement without compressed air.

  Since the burden when spraying the mortar upward is reduced, it is preferable that the operator supports the mortar sprayer by bringing the rear end of the first handle portion of the mortar sprayer into contact with the body. .

  According to the present invention, it is possible to provide a mortar sprayer that reduces the burden on the worker and has good workability, and can provide a repair or reinforcement method for a concrete structure with good workability.

It is a perspective view of the mortar sprayer of Example 1 of the present invention. It is a top view of the mortar sprayer. It is a side view of the mortar sprayer. It is a top view of the internal structure of the mortar sprayer. It is the perspective view which decomposed | disassembled some impellers of the mortar sprayer. It is a side view when the case holder of the casing of the mortar sprayer is removed. It is the top view and side view of a supply bush of the mortar sprayer. It is a side view of the mortar supply pipe of the mortar spraying machine. It is a perspective view which shows the use condition of the mortar sprayer. It is a schematic diagram of the support state of the mortar spraying machine and the mortar spraying machine of patent document 1. It is a side view of the mortar sprayer of Example 2 of the present invention. It is the top view and side view of the mortar spraying machine of this invention which changed the attachment position of the 2nd holding part of a 2nd handle part. It is the top view and side view of the mortar spraying machine of this invention which changed the 2nd handle part into the thing of an arch shape. It is the top view and side view of the mortar spraying machine of this invention which changed the 2nd handle part into the thing of T shape.

  The mortar spraying machine 10 of Example 1 of this invention is demonstrated using FIGS.

  The mortar sprayer 10 includes an impeller 11 that rotates about a rotating shaft 12, a casing 20 that surrounds the impeller 11 with a space therebetween, and rotatably supports the rotating shaft 12, and a rotation center of the impeller 11 that is provided in the casing 20. A mortar supply pipe 30 that supplies mortar toward the interior and an electric motor 35 that rotationally drives the impeller 11 are built in. The mortar supply pipe 30 is provided on the right side of the casing 20 and is attached to the right side surface of the casing 20. A first handle portion 36 that extends rearward beyond the casing 20 and is provided on the left side of the casing 20, and is attached to the left side surface of the casing 20. And a second handle portion 40 extending upward. Note that the positions of the first handle part and the second handle part with respect to the casing 20 may be reversed left and right. That is, the first handle portion may be provided on the left side of the casing 20 and the second handle portion may be provided on the right side of the casing 20.

  The impeller 11 includes a substantially wheel-shaped rotor 13 fixed to the rotating shaft 12 by a bolt 13a, two impeller rings 14 spaced apart in the axial direction of the rotating shaft 12, and two impeller rings 14. It consists of two blades 15 which are provided and are attached at intervals in the circumferential direction of the impeller ring 14. The two impeller rings 14 each have a substantially disc shape with an opening at the center, and are provided in parallel to each other. The rotor 13 has two impeller rings 14 screwed to both sides of the outer ring 16 by bolts 14a. Further, notches 17 are formed at two positions at equal intervals in the circumferential direction of the outer ring 16, and a blade 15 is attached to each notch 17 by a blade presser 18. The blade 15 includes a striking surface 19 that pushes the mortar when the impeller 11 rotates. The striking surface 19 has a surface shape in which a cross section perpendicular to the radial direction of the impeller 11 is U-shaped in order to improve spot property and prevent dripping of the mortar. The opening angle of the U-shaped striking surface 19 is about 60 °. The same effect can be obtained even with a V-shaped striking surface instead of the U-shaped striking surface.

  The casing 20 includes a case 21 that surrounds the impeller 11 in the circumferential direction with a space therebetween, a case cover 22 attached to the left side of the case 21, and a right side of the case 21 so as not to hinder the rotation of the impeller 11. And the length M in the front-rear direction is about 16 cm. The casing 20 does not include a protrusion 42d for attaching a stay 42 described later. Therefore, the length M in the front-rear direction of the casing 20 is the length between the two-dot chain lines in FIGS. 3 and 6. Moreover, the strap 60 for an operator to hang on a shoulder and support at the time of use is provided.

  The case 21 has a substantially cylindrical shape in which a part of the front side (about a quarter of the circumferential direction from the upper end to the approximate center) is cut out, and the cutout portion 24 is a projection port 24 for projecting mortar. It has become. Further, a mounting portion 25 for attaching the mortar supply pipe 30 is formed at the notched upper end. A substantially cylindrical supply bush 26 for supplying mortar into the casing 20 is provided through the attachment portion 25. The supply bush 26 has an oval shape whose inner circumference is long in the circumferential direction of the casing 20 in order to supply the mortar into the casing 20 without clogging the mortar. Further, the mortar discharge port 27 provided at one end of the supply bush 26 is held inside the outer edges of the two impeller rings 14 so as to effectively reduce noise.

  The case cover 22 has a substantially disk shape with the center bulging outward, and a protrusion 29 for attaching the second handle 40 is formed at the substantially center.

  The case holder 23 includes a substantially disk-shaped side plate portion 28 and a fastening portion 50 that is provided in the approximate center of the side plate portion 28 and attaches the first handle portion 36.

  The fastening portion 50 includes a bearing holder 52 that rotatably supports the rotary shaft 12 by a bearing 51 included therein, and a drive portion case 53 for attaching the first handle portion 36. The bearing 51 is stopped at a predetermined position of the bearing holder 52 by a C-shaped hole retaining ring 54. A seal packing 55 is provided between the side plate portion 28 and the bearing holder 52.

  The rotary shaft 12 is rotatably supported by the bearing 51 and is connected to the joint rod 34 by a spacer nut 58 so that the axis of the joint rod 34 is fixed to the joint rod 34 to which the rotor 13 is fixed. A shaft 56 is provided.

  The mortar supply pipe 30 has a fixing flange 32 for fixing to the mounting portion 25 at the front end, and gradually decreases in diameter from the rear end to the intermediate portion in the length direction, from the intermediate portion in the length direction to the front end. It is a tube bent at an obtuse angle (about 135 °). The specific inner diameter is reduced in three stages from the rear end to 27.6 mm, 21.4 mm, and 15.9 mm, and 17.5 mm forward from the middle part. In order to supply the mortar sent through the flexible pipe 31 detachably attached to the rear end toward the rotation center of the impeller 11, the fixing flange 32 is connected to the mounting portion 25 so as to communicate with the supply bush 26. It is stuck.

  The second handle 40 is attached to the protrusion 29 of the case cover 22. The second handle portion 40 includes an arm 41 extending in the front-rear direction, and both ends of the arm 41 in the length direction are fixed to the case 21 via stays 42 attached to the protrusions 42d.

  The first handle portion 36 is attached to the drive portion case 53, and extends substantially horizontally from the gear case 39 to the rear, from a gear case 39 having a pair of bevel gears 37 and 38 as direction change transmission mechanisms, A substantially cylindrical first gripping part 36a having a diameter of about 56 mm and a buffer 33 made of a bubble cushioning material are provided at the rear end of the first gripping part 36a. The first handle portion 36 extends rearward beyond the rear end 20b of the casing 20, and its length L from the rear end 20b of the casing 20 is about 19 cm. Here, the rear end of the casing refers to the rear end of the casing excluding a protrusion having a function other than the original function of the casing (for example, the protrusion 42d for attaching the stay 42 in this embodiment). That is, the rear end 20b of the casing 20 is shown by a two-dot chain line in FIG. An electric motor 35 is provided inside the first grip portion 36a. The electric motor 35 is positioned such that a portion of about 90% by mass is behind the rear end 20b of the casing 20. The pair of bevel gears 37 and 38 are engaged with each other and interlocked. One bevel gear 38 is connected to the connecting shaft 56 of the rotary shaft 12, and the other bevel gear 37 is connected to the drive shaft 57 of the electric motor 35. The drive shaft 57 extends from the distal end portion of the rotary shaft 12 to the rear, that is, from the bevel gear 37 to the electric motor 35 along the length direction of the first handle portion 36. Although the drive shaft 57 and the rotary shaft 12 are orthogonal to each other, since the pair of bevel gears 37 and 38 are interposed, when the drive shaft 57 is rotated by the drive of the electric motor 35, the rotary shaft 12 is rotated. The impeller 11 rotates in the casing 20. Note that. During use, the front portion of the first handle portion 36 is covered with a cover 59. The cover 59 may not be used at the time of use.

  Next, a repair or reinforcement method for a concrete structure using the mortar sprayer 10 will be described.

  The mortar used for repair and reinforcement is a mortar kneaded by a mortar mixer and sent from the mortar pump to the mortar sprayer 10 through the flexible pipe 31.

  Then, as shown in FIG. 9 and FIG. 10A, the operator hangs the strap 60 obliquely on the left shoulder, with the right hand holding the first grip portion 36a of the first handle portion 36 and with the left hand of the second handle portion 40. Each of the second gripping portions 40a is gripped, and the buffer 33 at the rear end of the first handle portion 36 is brought into contact with the body to support the mortar sprayer 10. The impeller 11 that is rotationally driven by the electric motor 35 sprays the mortar projected from the projection port 24 to the repair / reinforcement portion to perform repair or reinforcement. The impeller 11 is used at a high speed of about 3000 to 7000 rpm.

According to the mortar sprayer 10 of this example, the following effects (a) to (n) were obtained.
(A) Since the mortar supplied from the mortar supply pipe 30 is projected without using compressed air by striking the blade 15 by the high-speed rotation of the impeller 11, there is no generation of dust, and the adhesion performance of the mortar is improved. There was no need to work while moving the equipment, making it smaller and lighter, requiring less power, facilitating operation, and improving work efficiency.
(B) Since the impeller 11 is surrounded by the casing 20 with a space therebetween, the casing 20 has a projection port 24 provided adjacent to the mortar supply pipe 30 so as not to directly contact the mortar projected by the impeller 11. It can be applied to repairing / reinforcing mortar with high viscosity and strong adhesive strength, preventing clogging in piping and preventing dripping of mortar.

(C) Since it has two impeller rings 14 and is struck by a blade 15 which is fed with mortar between them and rotates at high speed, it is possible to improve the spot property in the width direction, reduce the generation of noise, and reduce dust. At the same time, the environment could be improved.

(D) Since the electric motor 35 is provided in the first handle portion 36, it is not necessary to move the electric motor separately by carrying the electric motor on the back, and workability is improved.
(E) By supporting both sides of the casing 20, the mortar could be reliably sprayed to the repair / reinforcement location.
(F) The first handle portion 36 including the electric motor 35 provided so that the portion of about 90% by mass is located behind the rear end 20b of the casing 20 is gripped by the right hand, so that the electric motor 35 is brought into the body. By supporting the second handle 40 with the left hand and supporting the position close to the casing 20 on the side of the casing 20, the burden on the operator can be reduced.
(G) Since the rotary shaft 12 and the drive shaft 57 are orthogonal to each other, the reaction force is reduced to rotate the electric motor 35 in the direction opposite to the drive direction, and the right hand holding the electric motor 35 is moved to the right hand. The burden has been reduced.

(H) Since the second gripping portion 40a of the second handle portion 40 extends on the virtual extension line R of the rotating shaft 12 to the side of the casing 20, the inclination of the casing to the side can be suppressed and the mortar is repaired.・ I was able to spray reliably on the reinforcement.
(I) Since the first handle portion 36 extends rearward about 19 cm after exceeding the rear end of the casing 20, the operator can securely hold the first handle portion 36 and can support the mortar sprayer 10. It was.
(J) By supporting the mortar sprayer 10 by bringing the rear end of the first handle portion 36 into contact with the body, the burden on both hands could be reduced.
(K) Since the 1st handle part 36 was equipped with the buffer 33 at the rear end, it was possible to relieve the pressure on the body when the mortar sprayer 10 was supported.
(L) By placing the strap 60 on the shoulder and supporting the mortar sprayer 10, the burden on both hands could be reduced.

(M) Since the inner periphery of the supply bush 26 is formed into an oval shape that is long in the circumferential direction of the casing 20, the mortar can be supplied without clogging.
(N) Since the diameter of the mortar supply pipe 30 is gradually reduced from the rear end to the intermediate portion in the length direction and bent at an obtuse angle (about 135 °) from the intermediate portion in the length direction to the front end, the flexible pipe 31 could be fed without getting in the way and without clogging the mortar.

  The mortar spraying machine 70 of Example 2 of this invention is demonstrated using FIG.

  The mortar sprayer 70 is different from the mortar sprayer 10 of the first embodiment in that the mortar sprayer 70 includes a third handle portion 71 extending from the arm 41 to the lower side of the casing 20. Is the same. In addition, in FIG. 10, the same code | symbol is attached | subjected to the same member as the mortar sprayer 10. In FIG.

  The third handle portion 71 is in front of the second gripping portion 40 a of the second handle portion 40 and is attached to the lower surface of the arm 41.

  Next, a repair or reinforcement method for a concrete structure using the mortar sprayer 70 will be described.

  The mortar sprayer 70 is normally supported in the same manner as the mortar sprayer 10 to spray the mortar. However, when the mortar is sprayed upward, the third handle is used instead of the second handle 40. The mortar sprayer 70 is supported by the left hand holding the part 71 to spray the mortar.

According to the mortar sprayer 70 of the present example, in addition to the effect obtained by the mortar sprayer 10, the following effect (o) was obtained.
(O) When the mortar is sprayed upward, the third handle 71 is grasped and supported by the left hand, and the mortar is sprayed to the repair / reinforcement point facing down like the ceiling of the tunnel. I was able to alleviate the burden.

  According to the concrete structure repairing or reinforcing method of the present invention, compared with the conventional “left plaster finish”, “blasting with compressed air”, and “concrete spraying machine”, the generation of dust is reduced, and the mortar Apply to repair / reinforcement mortar that improves adhesion performance, allows workers to work while moving by hand, is easy to operate, improves work efficiency, has high viscosity, and has high adhesive strength It was possible to prevent clogging in the piping, prevent dripping of the mortar, improve the spot property, generate less noise, reduce dust, and improve the working environment. In addition, it is not necessary to carry the electric motor on the back, for example, and the workability is improved, and the burden on both hands supporting the mortar sprayer 10 is reduced. Could be done for hours.

  In addition, this invention is not limited to the said Example, In the range which does not deviate from the meaning of invention, it can change suitably and can be actualized. For example, as shown in FIG. 12, the second handle portion 40 is provided with the second grip portion 40a in the vicinity of the projection port 24 in front of the virtual extension line R of the rotating shaft 12, or as shown in FIG. As shown in FIG. 14, the two gripping portions 40a are bent in a bow shape and the front and rear ends are attached to the arm 41. Alternatively, as shown in FIG. For example, the rod-shaped connecting portion 40b extends from the approximate center in the length direction of the second gripping portion 40a to a substantially T-shape extending to the approximate center of the arm 41.

DESCRIPTION OF SYMBOLS 10 Mortar sprayer 11 Impeller 12 Rotating shaft 14 Impeller ring 15 Blade 20 Casing 20b Rear end 24 Projection opening 26 Supply bush 30 Mortar supply pipe 33 Buffer 35 Electric motor 36 First handle part 36a First grip part 37 Bevel gear 38 Bevel gear 40 Second handle part 40a Second gripping part 40b Connecting part 57 Drive shaft 70 Mortar sprayer 71 Third handle part R Virtual extension line

Claims (12)

Mortar that feeds mortar into the casing (20) and projects the mortar forward from a projection port (24) provided on the front side of the casing (20) by an impeller (11) that rotates in the casing (20) In spray machine (10, 70),
A first handle part (36) for an operator to grip with one hand and a second handle part (40) for gripping with the other hand are provided on the left and right sides of the casing (20),
The first handle portion (36) on the side where the rotating shaft (12) of the impeller (11) extends laterally extends beyond the rear end (20b) of the casing (20), and the rotation A drive shaft (57) extending rearward from the tip portion is connected to the tip portion of the shaft (12) via a direction changing transmission mechanism (37, 38), and a motor (35) for driving the drive shaft (57) is connected. Built in the first handle (36),
The mortar characterized in that the second handle part (40) has a center in the length direction of the second grip part (40a) to be gripped within a projection range of the casing (20) in a side view. Spray machine.   The mortar sprayer according to claim 1, wherein the first handle portion (36) extends rearward from 10 to 40 cm after exceeding the rear end (20b) of the casing (20).   The mortar sprayer according to claim 1 or 2, wherein a shape of the first grip portion (36a) gripped by the first handle portion (36) is a cylindrical shape having a diameter of 50 to 60 mm.   The mortar according to any one of claims 1 to 3, wherein the first handle portion (36) is provided with a buffer (33) at the rear end for relieving the pressure when contacting the worker. Spray machine.   The second handle portion (40) is configured such that the second grip portion (40a) extends on a virtual extension line (R) of the rotating shaft (12) to the side of the casing (20). The mortar sprayer as described in any one of -4.   The said 2nd handle part (40) was made into the arch shape which said 2nd holding part (40a) curved or bent and protruded to the side of the said casing (20). The mortar sprayer according to item.   The second handle portion (40) extends from the middle of the length direction of the rod-shaped second grip portion (40a) and the second grip portion (40a) extending along the side surface of the casing (20) to the casing (20). The mortar spraying machine according to any one of claims 1 to 4, wherein the mortar spraying machine has a T-shape including a rod-like connecting portion (40b) extending to 20).   The mortar sprayer according to any one of claims 1 to 7, wherein the mortar sprayer (70) includes a third handle portion (71) extending downward from the casing (20). The casing (20) is provided with a mortar supply pipe (30) for supplying mortar toward the rotation center of the impeller (11).
The said mortar supply pipe (30) is a tubular thing which diameter-reduced from the rear end to the intermediate part of the length direction, and was bent at an obtuse angle from the said intermediate part to the front end. The mortar sprayer according to item.   The opening (26) of the casing (20) for supplying mortar is an oval or elliptical opening that is long in the circumferential direction of the casing (20). The mortar sprayer described.   A repair or reinforcement method for a concrete structure in which the mortar sprayer (10, 70) according to any one of claims 1 to 10 is used for repair or reinforcement without compressed air.   The concrete according to claim 11, wherein an operator supports the mortar sprayer (10, 70) by bringing a rear end of the first handle (36) of the mortar sprayer (10, 70) into contact with a body. Repair or reinforcement method for structures.

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