JP2003251165A - Agitating/mixing apparatus for lining apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an agitating/mixing apparatus which can be implemented inexpensively by directly using a generally popularized air supply type spray device and obtains good lining with dust and a rebound reduced by well agitating/mixing a lining material and an accelerating agent. <P>SOLUTION: Agitating/mixing means with agitation rods 28 projected from rotary shafts 27 are installed in vertical cylindrical and funnel-shaped casings 19 installed vertically. A first introduction opening 14 for introducing the lining material at a low-pressure and a second introduction opening 15 for introducing the powdery accelerating agent at a high pressure are formed on the side of an upper part, and the accelerating agent is agitated/mixed while the lining material flowing down freely in the casings 19 is agitated by the agitation rods. On the side of a lower part, a third introduction opening 16 for introducing conveying compressed air along a funnel-shaped inner surface is formed, and a discharge opening 17 is formed at shaft center on the lower end side. The agitated/mixed lining material and the accelerating agent are accelerated by the compressed air and transported at a high pressure from the discharge opening 17. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for transporting a cement-based lining material such as concrete or mortar under high pressure by compressed air and spraying it with an injection nozzle to excavate a tunnel or a shaft. The present invention relates to a stirring mixer used for a lining device for lining a wall surface. 2. Description of the Related Art A lining device of this type is, for example, shown in FIG.
Traveling trolley 1 like a tunnel lining device shown by
Various equipment necessary for spraying such as a concrete pump 2, a compressor 3 and a quick-setting agent feeder 4 are mounted on the tip of a boom 5 which can be undulated and extendable via an attachment 6 which can be slid and swiveled. Is mounted, the concrete pump 2 and the injection nozzle 7 are connected by a pressure feed pipe 8, and the quick setting agent supply port 9 provided in the middle of the pressure feed pipe 8 is connected to the quick setting agent feeder 4. In the lining device, the lining material supplied to the concrete pump 2 by the concrete mixer truck is transported under high pressure to the injection nozzle 7 by the pressure pipe 8 using the compressed air from the compressor 3, and the quick-setting agent is supplied. The powdered quick-setting agent fed from the machine 4 is injected into the pressure-feeding pipe 8 from the quick-setting agent supply port 9, and the mixed lining material and the quick-setting agent are sprayed from the injection nozzle 7 onto the excavation wall. [0004] In the case of spraying by the pneumatic pumping method, there are advantages such as high construction efficiency and relatively inexpensive equipment. On the other hand, mixing of the lining material and the quick setting agent in the narrow pumping pipe 8 is performed. Some of the incompletely mixed quick-setting agent is discharged from the injection nozzle 7 as a powder, or separates when it rebounds and becomes floating dust and scatters around to cause dust pollution. In addition to this, there were drawbacks such as the inability to provide high-quality lining. Various studies have been made to solve these drawbacks. For example, the use of a liquid quick-setting agent has been attempted. However, there are difficulties in the quick-setting performance. Proposals have also been made to provide a dust removal tube that removes dust by suction, but it is not always a sufficient solution, such as clogging of the lining material or the possibility of the lining material remaining when the supply is stopped or stopped in the middle stage. Did not. On the other hand, in order to solve these drawbacks, the present applicants have disclosed a method of manufacturing a lining material using an impeller that rotates at a high speed without spraying, as disclosed in Japanese Patent Application Laid-Open No. 10-2198. With centrifugal projection,
A series of proposals have been made on a lining device for mixing a lining material and a quick-setting agent by using a stirring and mixing means in which a number of stirring rods are protruded from the outer periphery of a rotating shaft along an axis. According to these lining devices, it is possible to obtain a lining material in which the lining material and the quick-setting agent are mixed well and to obtain a good lining with less dust and rebound. Although excellent performance that can not be obtained can be expected, the disadvantages are that it is slightly inferior in terms of construction efficiency compared to the case of spraying by the pneumatic feeding method, and that the spraying equipment by the widely used pneumatic feeding method can not be used, Equipment costs for new purchase are required. SUMMARY OF THE INVENTION Accordingly, the present invention provides a stirring mixer for a lining device which can solve the above-mentioned problems of the lining device according to the prior art, and particularly a pneumatic pumping system which is widely used. A mixer that can be used at low cost by using the spraying equipment as it is, and can be expected to obtain a good lining with less dust and rebound by satisfactorily stirring and mixing the lining material and the quick setting agent. provide. A stirring mixer for a lining device according to the present invention comprises a casing having a vertically arranged cylindrical upper part and a funnel-shaped lower part connected to each other. A first mixing port provided with a stirring and mixing means in which a number of stirring rods are protruded from the outer periphery of the rotating shaft along the axis, and a first introduction port for introducing a low-pressure lining material to the upper periphery of the casing; Is provided at a high pressure, and the quick-setting agent introduced is agitated and mixed while the lining material which is introduced and flows freely in the casing is stirred by the stirring rod. In addition, a third inlet for introducing compressed air for conveyance at a high pressure along the inner surface of the funnel is provided on the outer periphery on the lower side of the casing, and a discharge port is provided on the lower axis of the casing for stirring and mixing. It is configured to transport at a high pressure from the discharge port while accelerating the compressed lining material and the quick-setting admixture with the introduced compressed air. [0011] In the stirring mixer for a lining device according to the present invention, the casing is formed of a vertical cylindrical body, and no lining material remains inside even when the operation is suspended or stopped, and the casing is formed on the inner surface of the casing. Since the adhering lining material is scraped off by the tip of the stirring rod, it is possible to perform work after resuming in a good condition without stagnation or blockage of the lining material, and the frequency of maintenance such as internal cleaning can be reduced. . Further, although the quick-setting agent cannot be sufficiently stirred and mixed into the lining material in a narrow pressure-feeding pipe as in the prior art, this stirring mixer can perform sufficient stirring and mixing in a wide casing. When a wide space is stirred in a state of coarse density, not a full state, the quick-setting agent is actively mixed with the lining material, and a uniform mixing state can be obtained even with a short flow distance. In particular, the lower casing is formed in a funnel shape in order to shift from a wide space to a narrow pressure feeding pipe again. In this case, the lining material usually becomes a dumpling state and may be closed. By jetting compressed air for transportation onto the inner surface of the funnel, the state of the lumps can be prevented from becoming a dumpling state, and the lining material introduced in an intermittent state can be transported at a high pressure to the pressure feed pipe in a fixed state. In contrast to the conventional lining device for a tunnel, a first inlet and a discharge port are connected in the middle of a lining material pressure-feeding pipe provided between a concrete pump and a spray nozzle, and a quick-setting agent feeder is provided. By connecting the second inlet to the compressor and the third inlet to the compressor respectively, the stirring mixer according to the present invention can be easily added, and it is inexpensive as a new tunnel lining device capable of reducing dust and providing good quality lining. Can be provided. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a stirring mixer for a lining device according to the present invention will be described in detail with reference to FIGS. 2 and 3 showing a preferred embodiment applied to a lining device for a tunnel. FIG. 2 shows a main part of a lining device for a tunnel, and FIG. 3 shows a longitudinal sectional view of a stirring mixer 10.
The same reference numerals are given and the detailed description is omitted. The stirring mixer 10 can be used by being attached to an appropriate position of the lining device. In the illustrated embodiment, the stirring mixer 10 is provided on the upper side of the stirring mixer 10 so as to interlock with the up and down movement of the boom 5. Although the support brackets 11 and 11 are provided and are connected to and suspended from the mounting bracket 12 provided on the boom 5 by the suspender 13, they may be mounted on the traveling vehicle 1 in a fixed state. The stirring mixer 10 has a first inlet 14 through which the lining material is introduced at a low pressure from the concrete pump 2 via a pressure feeding pipe 8A, and a quick-setting agent feeder 4 via a pressure feeding pipe (not shown). A second inlet 15 for introducing the powdered powdered quick-setting agent at a high pressure, and a pressure feeding pipe (not shown)
A third inlet 16 is provided for introducing compressed air for conveyance from the compressor 3 via a high pressure. The agitating mixer 10 has a discharge port 17 for transporting the agitated and mixed lining material and quick-setting agent at high pressure to the injection nozzle 7 through the pressure pipe 8B by compressed air for transportation.
The compressed air supply port 18 for introducing the compressed air for acceleration from the compressor 3 via a pressure feeding pipe (not shown) from the compressor 3 may be provided in the middle of the pressure feeding pipe 8B if necessary. It is. The first to third introduction ports 14, 15, 16 and the discharge port 17 and the compressed air supply port 18 can be connected to each pressure feed pipe via a detachable connection tool.
The stirring mixer 10 to which the present invention is applied can be easily added to the conventional tunnel lining device shown in FIG. 1, so that a new tunnel lining device capable of producing high quality lining with less dust can be provided at low cost. can do. Next, the details of the internal structure of the stirring and mixing device 10 will be described with reference to FIG. 3. The rotary driving portion 10A located at the upper portion and the stirring / mixing portion 10B located at the intermediate portion are roughly classified.
And a pneumatic transport unit 10C located at the lower part, and a vertically arranged cylindrical upper casing 19a accommodating most of the stirring and mixing unit 10B, and a funnel-shaped stirring and mixing unit 10B.
The casing 19 is formed by connecting the lower casing 19b, which partially accommodates a part of the casing, in an overlapping manner. The rotary drive unit 10A has a motor 20 mounted on an upper end thereof along the axis of a casing 19, and a bearing mechanism 22 provided on an outer periphery of a connecting shaft 21 attached to the motor shaft. The flange 23 connected to the upper and lower casings 11a and 11b is detachably connected to a flange 24 provided at the upper end of the upper casing 19a by screw means 25. When the screw means 25 is removed, the rotary drive unit 10A is removed from the casing 19.
The internal mechanism of the stirring / mixing unit 10B is detachable, and is configured so that cleaning and replacement can be performed. A rotating shaft 27 extending along the axis from a disk-shaped partition plate 26 attached to the lower end of the connecting shaft 21 is connected to the stirring and mixing section 10B, and the rotating shaft 27 is accommodated in the upper casing 19a. The portion to be formed is formed in the shape of a column having the same diameter, and the portion protruding into the lower casing 19b is formed in the shape of a truncated cone whose diameter gradually decreases. A number of stirring rods 28 project from the outer periphery of the rotating shaft 27 at regular intervals in the circumferential and axial directions.
The tip of the shaft 8 extends to a position close to the inner wall surfaces of the upper casing 19a and the lower casing 19b so that the lining material attached to the inner wall surface can be scraped off. Thus, a stirring and mixing means is formed. The mounting interval and the extending direction of the stirring rods 28 can be arbitrarily set as desired. In the illustrated embodiment, the stirring rods 28 are horizontally arranged at 90 ° intervals in the circumferential direction. The first inlet 14 is provided on the outer periphery of the upper side of the upper casing 19a so that the introduced lining material can flow freely, and the powdered quick-setting agent can flow freely. The second introduction port 15 is provided below the first introduction port 14 so as to be sprayed. The pneumatic transport section 10C includes the lower casing 1
The upper opening of 9b is arranged so as to overlap the lower outer periphery of the upper casing 19a, and the flange 29 provided at the upper end can be detachably attached by a flange 30 provided in the middle of the upper casing 19a with a screw means 31. When the screw means 31 is detached, it is detachable from the upper casing 19a, and can be cleaned or replaced. The third inlet 16 is provided with an upper casing 19.
a and provided on the outer periphery of the upper end side of the lower casing 19b which overlaps with the inner casing a. The lower casing 1 is sprayed along the surface 33.
It is made to flow out from the discharge port 17 provided at the lower end side shaft center of 9b. In the agitating mixer 10 having the above-described configuration, the rotating shaft 27 driven by the motor 20 while the lining material introduced at a low pressure from the first inlet 14 freely flows down at least in the upper casing 19a. With the stirring rod 28 on the outer periphery, the mixture is agitated in a state of coarse density and caused to flow down. After being mixed with the powdery quick-setting agent introduced from the second introduction port 15 at a high pressure, the mixture is introduced at a high pressure from the third introduction port 16. It is accelerated by the compressed air for conveyance and transported at high pressure from the discharge port 17. According to the stirring mixer 10, the casing 19 is formed of a vertical cylindrical body, and the lining material does not remain inside even when the operation is suspended or stopped, and adheres to the inner surface of the casing 19. Since the lining material is scraped off by the tip of the stirring rod 28, the work after resumption can be performed in a good state without stagnation or blockage of the lining material, and the frequency of maintenance such as internal cleaning can be reduced. Although the quick-setting agent cannot be sufficiently mixed with the lining material in the narrow pressure-feeding pipe as in the prior art, the stirring mixer 10 can perform sufficient stirring and mixing in the wide casing 19. At the same time, when a wide space is stirred in a state of coarse density, not a full state, the quick-setting agent is actively mixed with the lining material, and a uniform mixing state can be obtained even with a short flow distance. In particular, from a large space, a narrow pressure feed pipe 8
In order to shift to B, the lower casing 19b is formed in a funnel shape. Is jetted to eliminate a dumpling state, and the lining material introduced in an intermittent state can be transported to the pumping pipe 8B at a high pressure in a fixed state. The present invention is not limited to the above-described embodiment, and can take various modifications within the scope of the gist. In the embodiment, the present invention is applied to a lining device for a tunnel. It is also applicable to a lining device, and in the case of a shaft, it is possible to move up and down the shaft in the same manner as a scaffold on the ground or in a shaft, and to lock and hold it at a desired position. The stirring mixer 10 can be mounted on a possible lifting platform. In this case, for example, the concrete tank 2 and various equipment necessary for spraying such as the compressor 3 and the quick-setting agent feeder 4 are mounted in any of the above-mentioned places, and the boom 5 and the attachment In addition to mounting the injection nozzle 7 via a positioning mechanism corresponding to 6, the stirring mixer 10 is mounted in the middle of a pressure feed pipe 8 connecting the concrete pump 2 and the injection nozzle 7.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a lining device for a tunnel according to the prior art. FIG. 2 is an explanatory view of a main part in which the stirring mixer of the present invention is applied to the tunnel lining device shown in FIG. FIG. 3 is a longitudinal sectional view of the entire stirring mixer according to the present invention. [Description of Signs] 1 Carriage 2 Concrete pump 3 Compressor 4 Quick binder feeder 5 Boom 6 Attachment 7 Injection nozzle 8, 8A, 8B Pressure feed pipe 9 Quick binder supply port 10 Stirring mixer 10A Rotary drive unit 10B Stirring Unit 10C Pneumatic transport unit 11 Supporting bracket 12 Mounting bracket 13 Hanging tool 14 First inlet (of lining material) 15 Second inlet (of powdered quick-setting binder) 16 Third inlet (of compressed air for transport) 17 Discharge port 18 Compressed air supply port 19 Casing 19a Upper casing 19b Lower casing 20 Motor 21 Connecting shaft 22 Bearing mechanism 23, 24, 29, 30 Flange 25, 31 Screw means 26 Partition plate 27 Rotating shaft 28 Stirrer rod 32 Ejection flow Road 33 Funnel-shaped inner peripheral surface

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B65G 53/16 B65G 53/16 4G056 53/32 53/32 4G078 E04G 21/02 103 E04G 21/02 103B E21D 11/10 E21D 11/10 D // B28C 7/02 B28C 7/02 (72) Inventor Sakae Nakai F-term (reference) 2D055 DB03 KA08 KC01 KC05 2E172 DC02 DC12 DC13 3F047 AA03 AA05 BA02 CA02 CA12 CA18 CC03 4G035 AB46 AE13 4G037 AA02 AA03 AA11 EA04 4G056 AA07 CC12 CE04 4G078 AA13 AB02 BA05 BA09 CA01 CA05 CA12 CA17 DA30 EA10

Claims (1)

Claims: 1. A casing having a vertically arranged cylindrical upper part and a funnel-shaped lower part connected to each other, and a large number of agitators are provided in the casing from the outer periphery of a rotating shaft along an axis. A stirring and mixing means provided with a rod is provided, and a first inlet for introducing the lining material at a low pressure and a second inlet for introducing the powdery quick-setting agent at a high pressure are provided on the outer periphery of the upper side of the casing. Then, the quick-setting agent introduced while stirring the lining material flowing freely in the casing with the stirring rod is stirred and mixed, and compressed air for conveyance is introduced at a high pressure along the funnel-shaped inner surface to the outer periphery on the lower side of the casing. 3 In addition to providing an introduction port, a discharge port is provided at the lower end side axis of the casing, and high-pressure transport from the discharge port is performed while accelerating with the compressed air for conveyance in which the lining material and the quick-setting agent mixed and mixed are introduced. Features and Stirring mixer for the lining apparatus.