JPH06212798A - Mixing device for additive to forced feed concrete - Google Patents

Abstract

PURPOSE:To enable an additive to be evenly mixed with concrete supplied under pressure through a forced concrete feed tube. CONSTITUTION:An injection nozzle 6 for feeding an additive joins a forced feed tube 3 at a position relatively near the delivery outlet 3a thereof, and an agitation mixing device 10 is coaxially laid with the tube 3 at the downstream side of the nozzle 6. The device 10 is equipped with a pair of rotational tubes 11 laid coaxially with the tube 3 and rotatably supported thereon via a bearing, and a pair of drive motors 12 for causing each of the tubes 11 to rotate in an opposite direction. In addition, each of the tubes 11 is internally provided with four agitation rods 20 respectively arranged radially and dephased at 90 degrees.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for mixing additive material to a concrete for pressure addition for mixing an additive material such as an admixture to the concrete to be pressure-fed by a concrete pressure-feed pipe.

[0002]

2. Description of the Related Art For example, in a mountain tunnel or the like, when concrete or the like is placed or sprayed in order to form a lining body of concrete or mortar, the strength of the concrete or the like is cured early. In order to develop the above, an admixture such as a quick-setting admixture or a liquid or powder-like fast-strength additive such as a quick-hardening material is added.

At this time, it is necessary to uniformly mix the additive with concrete or the like in order to efficiently bring out the effect thereof. Then, when performing the spraying work, concrete or the like is jetted to a required location by compressed air and collides with the sprayed surface. When mixed appropriately, the desired effect of the additive can be efficiently exhibited.

[0004]

However, for example, in the so-called first receiving method, as in the case of constructing a lining body in front of the face in advance, concrete fed from a concrete pump using a concrete pumping pipe is poured into the excavation groove. When placing concrete to be poured, it is necessary to inject and mix the additive material in the middle of the concrete pumping pipe, but in the method of mixing by injecting such additive material, the injected additive material is injected at the injection point. The additive is uniformly mixed in the concrete because it is pumped as it is, or it wraps around the sliding surface between the inner wall of the pipe and the concrete to be flown into a place with a large amount of mortar and less resistance. There was a problem that it was difficult.

Further, in order to sufficiently mix, a method of adding the additive at an early stage, stirring and mixing, and then feeding under pressure can be considered. However, for example, when an early-strength additive is used as the additive, a pipe is used. If the path is long, concrete will harden in the pumping pipe, and transportation will be impossible.

The present invention has been made to solve the above problems. The additive material is easily dispersed and mixed in the concrete to be pumped by the concrete pumping tube, and the additive material is uniformly mixed in the middle of the pipeline. It is an object of the present invention to provide an apparatus for mixing additive materials into pumped concrete, which enables easy production of improved concrete.

[0007]

In order to achieve the above-mentioned object, the mixing device of the additive material to the pressure-fed concrete of the present invention has one end joined in the middle of the conduit of the concrete pressure-fed pipe connected to the concrete pressure-fed pump. An injection nozzle for supplying the additive material, and at least two rotary pipes which are downstream of the injection nozzle and which are coaxially and rotatably connected to the concrete pressure-feeding pipe and which have a rod projecting from the inner periphery thereof. A rotary drive means for rotating the rotary tubes so that the adjacent rotary tubes rotate in opposite directions.

Here, the concrete is cement,
This is a general term for materials that are mainly composed of water and aggregates and that are hardened by the hydration reaction of cement and water, and also include materials such as mortar.

[0009]

According to the mixing apparatus having the above structure, the concrete in which the additive is injected from the injection nozzle in the pressure feed pipe moves to the downstream side in the pressure feed direction and passes through the rotary pipe. Then, the concrete passing through the inside of the rotary pipe is agitated by the rod projecting on the inner circumference of the rotary pipe,
Mixing with the additive is accelerated by the rotation shearing force of the rotating tube in the direction perpendicular to the pumping direction, and the larger rotation shearing force of the adjacent rotating tube rotating in the opposite direction. . Therefore, concrete in which the additive is uniformly mixed is easily formed by these actions.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows the entire configuration of the present invention when applied to a concrete pressure-feeding plant used when constructing a tunnel lining body by a pre-receiving method. One end is connected to a concrete supply tank 1 and a concrete pressure-feeding pump 2. The discharge port 3a of the concrete feed pipe 3 is
The outer periphery of the face 4 is inserted into an excavation groove 4a excavated along the cross-sectional shape of the tunnel, and concrete 5 is supplied and placed in the excavation groove 4a.

An injection nozzle 6 for adding an additive such as an early-strength admixture merges with the pressure-feeding pipe 3 relatively near the discharge port 3a side and communicates with the inside of the pressure-feeding pipe 3. There is. The injection nozzle 6 is connected to a fast-strength admixture supply tank 8 and a metering pump 9 through a hose 7, and supplies the admixture in an amount corresponding to the amount of concrete transported through the pressure feed pipe 3 into the pressure feed pipe 3.

At the tip of the injection nozzle 6, that is, on the downstream side,
In the middle of the pressure feeding pipe 3, a stirring and mixing device 10 that constitutes the mixing device 50 together with the injection nozzle 6 is arranged coaxially with the pressure feeding pipe 3.

The stirring and mixing apparatus 10 has a pair of rotary tubes 11 coaxial with the pressure feed tube 3 and rotatably supported by the pressure feed tube 3.
And a pair of drive motors 12 for rotating the rotary tubes 11 in opposite directions.

Then, as shown in more detail in FIG.
Each of the rotary tubes 11 has a watertight rotary joint portion 14 at one end.
The rotary pipe 11 is rotatably connected to the connecting end of the pressure feeding pipe 3, and the connecting ends of the rotary pipes 11 are also rotatably connected via the watertight intermediate joint 15.

The intermediate joint portion 15 is fixed to an intermediate portion of a rotation preventing fixing bracket 16 of the pressure feeding pipe 3. Further, pedestals 17 are provided at both ends of the fixed bracket 16, and the drive motors 12 are fixed on the pedestals 17, respectively.

Each drive motor 12 is connected via a pinion 19 to a gear 18 that is flange-connected on the rotary side of the rotary joint portion 14, and the rotary tubes 11 are connected to each other according to the rotational direction of each drive motor 12. It is driven to rotate in the reverse direction.

As shown in FIG. 3, four stirring rods 20 are provided in each rotary tube 11 at intervals in the tube axis direction and project toward the center by shifting the phase by 90 ° in the circumferential direction. It is set up. Each of the stirring rods 20 rotates with the rotation of the rotary pipe 11 to stir the concrete sent through the pressure-feeding pipe 3, and the fast-mixing admixture quantitatively injected into the pressure-feeding pipe 3 through the injection nozzle 6 is By this stirring action, it is uniformly mixed and dispersed inside the concrete.

Further, each of the rotary pipes 11 rotates, and each of the adjacent rotary pipes 11 rotates in the opposite direction according to the rotation direction of each of the drive motors 12, so that the concrete passing through the rotary pipes 11 becomes A large rotational shearing force is applied along a plane perpendicular to the pumping direction. Therefore, the stirring effect of the stirring and mixing device is further enhanced, and the concrete that has passed through the downstream rotary pipe 11 is in a state in which the early-strength admixture is uniformly dispersed in the concrete, and in this state, the excavation groove 3a is filled. It is cast. As a result, the filled poured concrete 5 is rapidly hardened by the action of the early-strength admixture, and the strength can be exhibited early.

In the embodiment, a pair of rotary tubes 11
The respective drive motors 12 are rotated in the reverse direction, but the drive motors may be rotated by one drive motor through the reverse rotation mechanism. Further, the rotating tubes 11 may be provided not only as a pair but also as more than one pair. Furthermore, the rotary tube 1
The number of stirring rods provided in 1 is also arbitrary.

[0020]

As described above in detail with reference to the embodiments, according to the mixing apparatus for the additive material to the concrete for pumping according to the present invention, it is provided on the inner circumference of the concrete pumping pipe so as to be coaxially and rotatably connected thereto. Since at least two rotary pipes having rods for rotating and rotary drive means for rotating adjacent rotary pipes in mutually opposite directions are provided, the concrete passing through the rotary pipes is stirred by the rods, and each rotary pipe is rotated. Then, a rotational shearing force is generated in a direction perpendicular to the direction in which the concrete is pumped, and by promoting the mixing with the additive material by these, concrete in which the additive material is uniformly mixed can be easily obtained.

[Brief description of drawings]

FIG. 1 is an overall explanatory view showing an embodiment to which a mixing device of the present invention is applied.

FIG. 2 is a cross-sectional view of essential parts of a stirring and mixing device in the same pressure-feeding pipe.

3 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

2 Concrete pumping pump 3 Concrete pumping pipe 6 Admixture injection nozzle (mixing device) 10 Stirring mixing device (mixing device) 11 Rotating pipe 12 Drive motor 18,19 Power transmission mechanism (18 gear, 19 pinion) 20 Stirring rod 50 Mixing device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 000219875 Tokyu Corporation 1-16-14 Shibuya, Shibuya-ku, Tokyo (71) Applicant 000231198 Japan Land Development Co., Ltd. 4-9-9 Akasaka, Minato-ku, Tokyo (71) Applicant 000140982 2-5-8 Kitaoaoyama, Minato-ku, Tokyo (71) Applicant 000005924 Mitsui Miike Manufacturing Co., Ltd. 2-1-1 Nihombashi Muromachi, Chuo-ku, Tokyo (71) Applicant 000003296 Electric Chemical Industry Co., Ltd. 1-4-1 Yurakucho, Chiyoda-ku, Tokyo (72) Inventor Koji Adachi 284-2 Obuchi, Fuji City, Shizuoka Prefecture Japan Construction Mechanization Association Construction Mechanization Research Institute (72) Inventor Hiroyuki Matsushima Tokyo Metropolitan Government 2-3, Kandajimachi, Chiyoda-ku Stock company Obayashi Corporation Tokyo head office (72) Inventor Hideki Takeuchi Koraku 2-, Bunkyo-ku, Tokyo -8 In Goyo Construction Co., Ltd. (72) Inventor Reie Iwasaki 1-19-40 Edakita, Midori-ku, Yokohama-shi, Kanagawa (72) Inventor Seishiro Mizuno 4-9-9 Akasaka, Minato-ku, Tokyo Japan Land Development Co., Ltd. (72) Inventor Hiroshi Taniguchi 2-5-8 Kita-Aoyama, Minato-ku, Tokyo In-house Co., Ltd. (72) Inventor Jun Tsurumoto 2-1-1 Nihonbashi Muromachi, Chuo-ku, Tokyo Mitsui Miike Manufacturing Co., Ltd. (72) Inventor Tetsuo Otsuka 2209 Ome, Ome Town, Ome Town, Nishikubiki District, Niigata Prefecture Ome Factory, Denki Kagaku Kogyo Co., Ltd.

Claims (1)

[Claims] 1. An injection nozzle for supplying an additive material by joining one end of a concrete pressure-feeding pipe connected to a concrete pressure-feeding pump to supply an additive material, and a coaxially provided on the concrete pressure-feeding pipe downstream of the injection nozzle. And at least two rotary tubes that are rotatably connected and that have rods that project from the inner circumference, and rotation drive means that rotates the rotary tubes so that adjacent rotary tubes rotate in opposite directions. A device for mixing an additive material into pumped concrete, which is characterized by being provided.