JPH0537331U - Pipeline mixer - Google Patents

Abstract

(57) [Summary] [Purpose] The pipe mixer for spraying has a simple structure,
Mix, mix, stir and disperse fresh concrete and quick setting agents always as designed. [Structure] A casing 11 is provided between the nozzle 5 '' and a pipe 13 via a flange 12, and a rubber tube 17 is provided in the casing 11 via a sealing liquid 20. The rubber tube 17 has a flat inner surface. The rubber tube 22 and the outer metal spring 23 are provided in a ring shape to form flattened throttle portions 19, 19 having a predetermined number of steps in the longitudinal direction. [Effect] Even if a powdery quick-setting agent is mixed in the conduit flowing through the rubber tube 17, the flat-shaped throttle portion 19 whose phase is changed by 90 degrees uniformly disperses, stirs, and mixes the coarse aggregate,
The elastic ring 21 expands and contracts with respect to the fine aggregate and the quick-setting admixture to escape this, and at the same time maintains the mixing and stirring functions.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The disclosed technology belongs to the technical field of the structure of the mixer when the shot concrete is poured onto the ground or slope of the tunnel.

[0002]

[Prior Art]

 As is well known, culverts and open culverts such as railways, roads and waterways have been extensively constructed by national networks such as lifelines and transportation networks.

[0003] In constructing such a structure, after excavating the natural ground, in addition to maintaining the shape of the natural ground, sprayed concrete such as so-called shotcrete is used to prevent loosening and water leakage. Widely used in wet and dry systems.

Although there are advantages and disadvantages to these wet and dry sprayed concrete works, the wet method is now widely used in terms of dust generation and dust generation in the working environment. As shown in Fig. 5, a concrete mixing base is used because a slurry-like base material mixed with cement, coarse aggregate, fine aggregate, etc. is mixed with an inorganic salt-based quick-setting agent and ejected onto the wall surface. At this point, cement 2, aggregate 3, and water 1 are weighed and mixed in a mixer 4 to prepare ready-mixed concrete of a prescribed mix, which is sprayed while agitating it with an agitator 3 '' through a hopper 3 '. After being transported to the ground, it is thrown into the spraying machine 5, pressure-fed in the hose 5 ', and sprayed from the nozzle 5' 'to the ground surface.

At this time, the quick-setting agent 6 is pumped in the hose 6 ″ at a position of about 3 to 5 m before the nozzle 5 ″, and the Y-shaped supply pipe 5 ′ provided on the hose 5 ′. It is added to the hose 5'through '' and is mixed and mixed with the fresh concrete so that the system is sprayed.

However, with the method of introducing the quick-setting admixture 6 through the Y-shaped supply pipe 5 ′ ″, it is impossible to uniformly mix with the fresh concrete during the pressure feeding to the nozzle 5 ″.

To deal with this, for example, a so-called static mixer 8 or a scare mixer 8'as shown in FIG. 6 may be incorporated in the flow system.

[0008]

[Problems to be solved by the device]

 However, in duct mixers such as the seed static mixer 8 and the scare mixer 8 ', the blades 9 are twisted, and the plates 9'also intersect at right angles to each other and a plurality of predetermined stages are set in the axial direction. Therefore, the pipe mixers 8 and 8'have a fixed shape and structure, and the blades and plates 9 and 9'have good stirring and mixing efficiency in the flow-through process for the fluid, but In a slurry mode in which a quick-setting agent is mixed in addition to coarse aggregate and fine aggregate in the channel, the coarse aggregate and fine aggregate are dispersed in the pipeline, but a so-called powder type quick-setting agent is used. As shown in Fig. 5, the agent is mixed before the nozzle 5 '' with respect to the wall surface 7, for example, at a set site such as 3 m, so it is mixed with the pipeline, cement, coarse aggregate and fine aggregate. , It is difficult to uniformly disperse, mix and stir in the stirring process However, since it is sprayed as a raw concrete in a floating state such as so-called lump as it is in a powder state, there is a possibility that the quality of the sprayed concrete may be deteriorated, and a difference in setting hardness and strength may occur. There was a drawback.

Further, as described above, since the blades 9 and the plates 9 ′ in the pipe line mixers 8 and 8 ′ are fixedly installed in the narrow pipe line, they are clogged during the feeding, resulting in smoothness. There was a problem that spraying could not be performed easily, which could lead to a reduction in work efficiency.

Further, if the feed pressure in the pipe line is increased to increase the flow velocity, the blade 9 and the plate 9 ′ may be worn, which may cause deterioration of durability and deterioration of function.

In order to deal with this, Japanese Patent Application Laid-Open No. 48-84954 (Japanese Patent Publication No. 51-39382), which is one of the applicants' prior applications, was developed and the axial direction of the pipeline, that is, the flow-through direction. On the other hand, a kind of pipe mixer was developed in which the flat-shaped narrowed portion was changed in phase by 90 degrees and formed in a predetermined number of stages, and because it had no mechanical drive, it had good durability and no maintenance required. ， Although the ones with good mixing efficiency have been developed and installed in various plants to perform excellent operation, in the prior art, the flat shape throttle part with a predetermined number of axial steps is fixedly formed. Therefore, there is a problem that clogging easily occurs when the slurry such as the narrowed part mixed with the coarse aggregate, the fine aggregate, or the quick-setting agent is flow-through mixed, and the narrow part for the construction work is created. The advantages of pipeline mixers in It had the disadvantage of becoming naive.

[0012]

[The purpose of the device]

 The purpose of the invention of this application is to rapidly mix the powder type mixed in, while taking advantage of the excellent features of the pipeline mixer used for sprayed concrete based on the above-mentioned conventional technology, which has both the original transport function and the mixing and stirring functions. It is a technical issue to solve problems such as the generation of floating agent state and the clogging phenomenon due to coarse aggregate and fine aggregate, and each material to be transported is uniformly dispersed, stirred, and mixed to ensure the nozzle. It is intended to provide an excellent pipeline mixer that can be spouted out of the construction industry and can be extended in durability without causing clogging over time, which is beneficial to the field of civil engineering applications in the construction industry. It is a thing.

[0013]

[Means / actions for solving the problems]

 In order to solve the above-mentioned problems, the structure of the invention of this application, which has the scope of the above-mentioned utility model registration request as a gist in accordance with the above-mentioned object, is supported by spraying concrete to the ground such as the tunnel inner wall or slope. When forming the concrete, it is possible to uniformly disperse, stir, mix and spray the raw concrete and the quick-setting agent such as powder type while transporting with the pipeline mixer. A 90 ° flat shaped throttle section is formed in the pipeline body at a predetermined pitch and adjacent to each other in the axial direction. A rubber tube is integrated inside the pipeline body and a metal spring is integrated on the outside. It is installed as an elastic ring formed on the inside of the casing, and by equipping the casing with a sealing liquid of water, oil, etc., inside the casing at a fixed pressure, each material passing through the inside of the pipeline main body will flow through it. About 90 degrees in the direction It is possible to surely disperse, mix, and stir by a flattened narrowed portion formed differently to obtain a uniform slurry state. Moreover, by using coarse aggregate, fine aggregate, etc. When the throttle part is likely to become clogged, the elastic ring expands in the pressurized state, allowing the mixed material to flow through smoothly to prevent blockage, and when the blockage in the throttle part is resolved, the elastic ring is elasticized. Due to the springback of the ring, the flat narrowed parts that are formed 90 degrees out of phase with each other in the longitudinal direction are restored, and their mixing and stirring functions are always maintained. No unmixed state was revealed, and technical measures were taken so that the curing and spraying strength could be uniformly formed at the spraying site as designed.

[0014]

【Example】

 Next, one embodiment of the invention of this application will be described below with reference to FIGS. 1 to 4.

The embodiment is an embodiment of a pipeline mixer 10 for spraying concrete against the ground such as the inner wall of a tunnel or the slope, and as in the conventional general embodiment shown in FIG. 5, green concrete 3 ′ and inorganic material etc. The quick-setting admixture (6) is uniformly dispersed, mixed, and agitated, and the specified sprayed concrete (7) is applied to the rock surface from the nozzle (5 ''). Connect the set length via multiple flanges 12 and 12 ', connect the nozzle 5'to the tip with a flange or the like, and connect it to the pipe 13 for transporting the fresh concrete fed in the same manner as in Fig. 5 with a flange or the like. There is.

In addition, for example, an inlet port 14 for the quick-setting agent 3 ′ such as an inorganic salt is provided in the pipe 13 3 m or the like from the tip of the nozzle 5 ″, and the powder-type quick-setting agent 3 ′ is freshly mixed. It is designed to be mixed in the basket.

Thus, in the unit-length casing 11, a tube 17 made of rubber or the like that concentrically forms the conduit main body is provided inside, and its flange 18 is sandwiched between the flange 12 of the casing 11. They are fixed together.

As shown in FIG. 2, the tube 17 made of rubber or the like of the conduit main body has a flat-shaped throttle portion 19, 1 whose phase is changed by 90 degrees in the longitudinal direction of the axial direction by a predetermined pitch, as described below. 9 is formed.

It should be noted that the number of stages in the unit length of one casing 11 of the flattened narrowed portion 19 is a design, and, for example, a predetermined number of stages such as two or three stages may be formed in one unit length. It is flexible to design.

Between the rubber tube 17 and the casing 11 made of a predetermined metal, for example, a sealing liquid 20 such as water or oil is press-fitted by an inlet port 16 at a set pressure, and during maintenance, the outlet port 16 The drainage can be exchanged through the rubber tube 17 so that the rubber tube 17 is maintained in a predetermined pressure-applied state.

A band-shaped rubber spring 22 is attached to the inside of each flat-shaped throttle portion 19, and a metal spring 23 made of spring steel is added to the outside thereof. An elastic ring 21, which is integrated by a sulfur treatment or the like, is wound to expand and contract the narrowed portion 19.

In a normal posture state, as shown in FIG. 2, the elastic rings 21, 21 are wound in a posture in which they intersect each other while changing their phases in the 90 ° axial direction.

As shown in FIGS. 3 and 4, each elastic ring 21 is expandable and contractable in the major axis and minor axis directions.

Therefore, the coarse aggregate and the fine aggregate that are mixed in the conduit 2 ′ depend on the particle size, but due to the mutual bridging action and the like, the flattened narrowed portion 19 is formed by the flow-through process. When a blocking operation occurs, a pressure is formed in the rubber tube 17 in the flow-through direction to spread the elastic ring 21 and allow it to pass easily. The elastic ring 21 is returned to the reset position and reduced to a flat shape to form a flat-shaped throttle portion 19 of the rubber tube 17.

Therefore, when no obstruction occurs in the flat-shaped throttle portion 19, the superposing action of the flat-shaped throttle portions 19 having a predetermined number of steps in the longitudinal direction sufficiently disperses, mixes, and mixes in the transportation process. Agitation is performed as designed.

The general shape of the rubber tube 17 having a circular cross section and the flat shape of the flat-shaped narrowed portion 19 are reliably retained by the sealing liquid 20.

In the above-mentioned configuration, fresh concrete is pumped in the primary mixing state from the transportation pipe 13, and a predetermined quick-setting agent 3 ′ such as powder type inorganic salt is jetted into the transportation pipe 13 from the inlet nozzle 14 in the material. When the mixture is mixed into the tube mixer 10 and is pressed into the tube mixer 10 and fed into the rubber tube 15 of the tube mixer body 11, the rubber tube 17 has a flat shape via the sealing liquid 19 in the casing 11. Since the constricted portions 19, 19 ... are formed by changing their phases by 90 degrees with respect to each other, the flow-through material is expanded and contracted in a predetermined number of steps in a tatami-fold manner to perform mixing and stirring in a uniformly dispersed state. Not only the fresh concrete but also the quick-setting admixture 3'is surely uniformly mixed and mixed, and there is no unmixed part as in the past, and the nozzle 5 has a certain fluidity as a whole in a uniform state. '' And is sprayed to the specified rock surface It is subjected to a REIT.

However, as described above, when raw concrete is mixed in the pipeline, there is a possibility that obstruction may occur at the flattened narrowed portion 19, but in that case, A compressed state is formed in the narrowed portion 19 of the shape, the rubber tube 22 inside the elastic ring 21 continues, and the metal spring 23 expands to cause blockage. Return to the initial set state by, and immediately recover the mixing and stirring functions.

Since such a posture change with time is also carried out in each flat-shaped diaphragm portion 19, the crushing compression action in the flat-shaped diaphragm 19 is automatically repeated with time. Also, the mixing and stirring is further promoted.

When the closed state is released, the force of each elastic ring 21 slipping toward the nozzle 5 '' side due to the resistance of the fresh concrete flowing through also tries to act, but the rubber tube 22 inside the elastic ring 21 Since the rubber tube 17 is tightly crimped, it does not slip in due to the frictional force.

As a matter of course, the initial setting posture of the rubber tube 17 with respect to the casing 11 is sufficiently maintained by the sealing liquid 20 press-fitted from the inlet port 16.

It is possible to freely change the design by injecting the sealing liquid under pressure to the set pressure from the inlet port 16 during operation or by appropriately flowing out from the outlet port 16 to reduce the pressure. is there.

In this way, the sprayed concrete construction work is performed as designed with the same function while sufficiently maintaining the pipeline mixer function.

For maintenance during operation, the flanges 12 and 12 of the casing 11 of each unit length can be disengaged, and maintenance, inspection, maintenance and replacement can be appropriately performed.

Of course, the embodiment of the invention of this application is not limited to the above-mentioned embodiment, and for example, a vibrator or other blocking device can be attached to the outside of the casing. Various modes can be adopted.

In addition, it goes without saying that a pressure gauge and a flow meter can be connected to the pipe mixer main body as a design modification.

[0037]

[Effect of the device]

 As described above, according to the invention of this application, basically, in a pipeline mixer that is connected to a nozzle that sprays concrete against a slope, there is no mixing of blades or the like, and clogging of the flow-through material, etc. The excellent effect of being able to have a function that does not always occur and does not always change after the initial setting is exhibited.

In addition, by providing a plurality of predetermined stages in the longitudinal direction of the flattened narrowed portion for mixing and stirring during fluid transportation, it is possible to reliably perform mixing and stirring during fluid transportation to achieve uniform dispersion. In addition, it is possible to maintain the initial setting posture of the pipeline mixer main body such as rubber tube by inserting and pressing a sealing liquid such as water or oil between it and the outer casing. The excellent effect that the stirring function is sufficiently maintained is exhibited.

Thus, the main body of the pipe such as the rubber tube of the pipe mixer forms a flat-shaped narrowed portion by changing the phase by a predetermined number of steps of 90 degrees in the longitudinal direction, and furthermore, for each flat-shaped narrowed portion. As a result, by covering the elastic ring in a flat shape, even if solid matter such as aggregate in the fluid flowing through the narrowed portion of the flat shape tries to close due to a bridge phenomenon, etc. When the elastic ring expands and contracts through the elasticity to flow through the solid material, the elastic ring immediately becomes a flat-shaped squeezed portion through the action of the liquid sealing between the casing and the main body of the conduit on the elastic ring. There is an effect that the mixing and stirring functions can be always maintained by returning to the initial state.

The pipe mixer according to the invention of this application avoids an abnormal increase in internal pressure during operation by escaping solid substances that are occluded in the flow-through direction, resulting in damage to the pipe body. It has the effect of improving durability.

Further, since the structure does not have a blade or the like, and it is always possible to maintain the shape retainability in a simple shape, the initial manufacturing and assembly are easy and the initial cost is low, and maintenance inspection and maintenance are performed. The maintenance cost is almost unnecessary, so the running cost will not be high, leading to cost reduction.

[Brief description of drawings]

1 to 4 are explanatory views of an embodiment of the invention of this application.

FIG. 1 is an overall schematic side view of a pipeline mixer.

FIG. 2 is a partially cutaway perspective view of a pipeline mixer.

FIG. 3 is a partial cross-sectional view of FIG.

4 is a partial cross-sectional view of FIG.

FIG. 5 is a flow system diagram of concrete spraying in a general mode.

FIG. 6 is a schematic perspective view of a conventional line mixer.

FIG. 7 is a schematic perspective view of a pipeline mixer according to the conventional mode.

[Explanation of symbols]

 17 Pipe body (rubber tube) 19 Flat-shaped throttle 10 Pipe mixer 11 Casing 20 Sealing liquid 21 Elastic ring 22 Rubber tube 23 Metal spring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuhiro Suenaga 484-1 Kodori Kotani-cho, Ryugasaki-shi, Ibaraki (72) Inventor Shuichi Shuichi Shimazaki Co., Ltd. 2-24-2 Nishi-nippori, Arakawa-ku, Tokyo (72) Inventor Masahiko Iwafuji 47-3 Mita, Atsugi, Kanagawa Prefecture Central Research Institute, Sato Industry Co., Ltd.

Claims (3)

[Scope of utility model registration request] 1. A pipeline mixer in which a plurality of narrowed portions having flat cross-sections are formed at a predetermined pitch in the longitudinal direction of the pipeline main body, and a flexible pipeline with a sealing liquid in the casing. A pipeline mixer characterized in that a main body is provided with a plurality of stages of flat-shaped narrowed portions formed and extended in the longitudinal direction, and an elastic ring is externally mounted on the narrowed portions. 2. The pipeline mixer according to claim 1, wherein the elastic ring is composed of an inner rubber tube and a metal spring in close contact with the outer side of the rubber tube. 3. The utility model registration claim, wherein the casing has a sealing liquid and a pipe body for each unit length, and the respective unit parts are adjacent to each other and are connected through a joint. The pipe mixer according to item 1.