JP2002220924A - Head nozzle for concrete transport pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a head nozzle connected to the top end of a concrete transport pipe of a concrete pumper which prevents separation of mixed concrete discharged from the top end of the pipe, and reduces burdens of workers, and secure safety for the workers. SOLUTION: A head nozzle 5 having a plurality of curved nozzle pipes 12, 14, 16 and 18 is curved in zigzags. Padding portions 10a, 10b... are formed on an inclined plane of the inner wall at lower part of the nozzle pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nozzle attached to the end of a transport pipe as an outlet when concrete flows from a concrete pump truck through a transport pipe.

[0002]

2. Description of the Related Art At present, this method has become the mainstream, so that concrete pouring is said to be pressure feeding by a concrete pump. Concrete pumps include a squeeze type and a piston type, and among these types, various types are known, and they are used properly according to applications. However, basically, the concrete pumped from the pump flows through the transport pipe and is poured into a predetermined place from the tip hose.

[0003] The capacity of recent concrete pumps is very good, and the above-mentioned transport pipes can be made very long so as to reach a high place of 20m to 30m above the ground. However, in general, a plurality of bent booms are provided. A transport tube is attached to the boom and connected to each other. Then, concrete discharged from the hose at the tip of the transport pipe is poured into a predetermined place, but there remain various problems such as the inability to drive uniform concrete kneaded by a mixer truck.

FIG. 3 shows an intermediate hose from a boom transport pipe (a).
(C) shows a specific example of the end hose (b) connected to the concrete, the concrete kneaded uniformly is pumped through the transport pipe (b) by a concrete pump, and the intermediate hose (c) is connected. Tip hose that passes through and extends vertically downward (b)
, Concrete will fall and drain by itself under its own weight. The concrete pumped through the transport tube
There are many gravel in the center and cement, sand and water in the periphery, and the layers are divided. Then, if the concrete of the tip hose (b) flows down faster than the pumping speed, the inside of the rear transport pipe will be in a vacuum state.

Accordingly, cement, sand, and water near the viscous paste-like inner wall remain, and only the gravel in the center falls. If concrete mixed uniformly with cement, sand, gravel, and water in a ready-mixed concrete car is non-uniformly cast with the tip hose (b), the desired concrete strength cannot be obtained. In addition, when such a straight transport pipe or hose is straight, the falling speed of the gravel in the center is high, so the concrete that has fallen and jumped up is caught by nearby workers, and is soiled by the formwork. .

Conventionally, a tip hose (b) is placed on a scaffold plate and a hard tip hose (b) is curved so that concrete is not separated. Then, the tip hose (b) must be fixed so that it does not slide down, and the boom must be raised and the concrete in the tip hose (b) must be emptied every time the pouring place is moved. For example, if the tip hose (b) with a diameter of 5 inches is 5 m, if the concrete is filled inside, the weight will reach about 200 kg, resulting in damage to the scaffolding and formwork, and safety of the worker. Sex is also impaired.

[0007] Therefore, an L-shaped nozzle may be connected to the tip of the transport pipe or hose. However, if such an L-shaped nozzle is used, concrete will not fall at a high speed due to the presence of a horizontal portion. However, there is a trouble that the tip nozzle cannot be guided into a narrow space, concrete is accumulated in a horizontal portion of the tip nozzle, does not flow down to the end, and the operator has to handle it by hand at the end. In some cases, it is difficult for the concrete with the bottom slump to flow out.

[0008]

As described above, the conventional tip nozzle has the above-mentioned problems. The problem to be solved by the present invention is this problem, which makes it possible to cast uniform concrete, to introduce it even in a small space, and to release workers from heavy labor. Provided is a tip nozzle of a concrete transport pipe with improved safety.

[0009]

The tip nozzle of the concrete transport pipe according to the present invention is not straight or L-shaped as in the prior art, but is curved in a zigzag manner. Here, the curved form has a smooth shape, and has a straight nozzle tube at the tip. By forming a zigzag, the inner wall surface where the concrete flowing through the tip nozzle strongly hits is coated to prevent wear.

As one form of the overlay, a hard metal plate can be attached to the inner wall surface, but it is generally formed by welding metal, and the surface of the overlay has small irregularities. . This uneven surface increases the flow resistance of the concrete and suppresses the flow out due to its own weight. Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings.

[0011]

FIG. 1 shows a case where concrete 2 is cast using a concrete pump truck 1. Concrete pump truck 1 is supplied with concrete 2 from ready-mixed concrete truck 3, and this concrete 2 is supplied to concrete pump truck 1
Transport pipe 4 by a concrete pump mounted on
Will be pumped. Then, it flows out from the tip nozzle 5 connected to the tip of the transport pipe 4 and is driven.

The concrete pump truck 1 is firstly moved from the vehicle body side.
The boom 6, the second boom 7, and the third boom 8 are connected to bendable, and transport pipes 4, 4,... Are attached to each of the booms 6, 7, 8, and are connected to each other. Therefore, the tip nozzle 5 can be guided to a predetermined location by appropriately bending and moving each of the booms 6, 7, and 8. The recent concrete pump truck 1 is equipped with a high-performance pump and is capable of connecting a plurality of booms to pump concrete to a place having a height of 25 m or more.

FIG. 2 is an embodiment of the present invention showing the tip nozzle 5. As shown in FIG. 1, the tip nozzle 5 is connected to the tip of the transport pipe 4 or the tip of a hose, and is curved in a zigzag shape so that the concrete 2 fed through the transport pipe 4 does not drop by its own weight. Tip nozzle 5
A flange 9 is provided at the upper end of the container 2 and is connected to the transport pipe 4. The concrete 2 flows out of the tip nozzle 5 at the same speed as the pumping speed of the concrete pump. Therefore, no vacuum state is created inside the nozzle tube based on the natural fall due to its own weight.

On the inner wall surface of the tip nozzle 5 of the present invention, overlaid portions 10a, 10b... Are provided so that the inner wall surface is worn by the flow of concrete so that holes are not formed. The cladding is performed by welding a metal, and the hardness is high so that it is hard to wear, and the surface is roughened to give resistance to the flow of concrete.

The concrete 2 is pressure-fed from the transport pipe and flows in a zigzag manner through the tip nozzle 5, and the inner wall surface of the curved portion is provided with embossed portions 10a, 10b, 10c. It does not fall under its own weight and flows down at the same speed as the pumping speed of the concrete pump. Here, the zigzag shape of the tip nozzle 5 is not particularly limited, but the tip nozzle 5 shown in the figure connects a plurality of curved nozzle tubes and straight nozzle tubes by welding.

The tip nozzle 5 shown in FIG.
Are the straight nozzle tube 11 and the curved nozzle tube 1 from the tip.
2. The straight nozzle tube 13, the curved nozzle tube 14, the straight nozzle tube 15, the curved nozzle tube 16, the straight nozzle tube 17, and the curved nozzle tube 18 are connected by welding, respectively. The straight nozzle pipes 13, 15, 17
Have the same size, and the curved nozzle tubes 14, 16 have the same shape.

Here, the curved nozzle tubes 12, 14, 1
6, the size of the radius of curvature, and the straight nozzle tube 13,
The lengths of 15, 17 are not particularly limited. As described above, the tip nozzle of the present invention is constituted by a zigzag curved tube, and the following effects can be obtained.

[0018]

As the tip nozzle of the present invention is curved in a zigzag shape with an appropriate curvature, the concrete pumped from the transport pipe does not drop by its own weight, and a ready-mixed concrete vehicle is sufficient. The kneaded concrete flows out without being separated and is poured. In addition, since there is no horizontal portion in the curved nozzle tube, the last concrete does not accumulate in the nozzle, and the concrete can flow smoothly even if the bottom slump is mixed.

[0019] Even if it is curved in a zigzag shape, it can be guided into a narrow space and driven. On the other hand, since the tip nozzle of the present invention is curved in a zigzag shape, the concrete does not drop by its own weight, so that the concrete does not jump up and hit the body of the work vehicle, and also the concrete formwork is soiled. Absent. In addition, the operator does not need to handle the heavy tip hose as in the related art, which is free from safety and heavy labor.

[Brief description of the drawings]

FIG. 1 is an overall external view in which concrete is poured by a concrete pump truck.

FIG. 2 is a specific example of a tip nozzle according to the present invention.

FIG. 3 shows a conventional tip nozzle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete pump truck 2 Concrete 3 Ready-mixed concrete truck 4 Transport pipe 5 Tip nozzle 6 First boom 7 Second boom 8 Third boom 9 Flange 10 Overlay section 11 Straight nozzle pipe 12 Curved nozzle pipe 13 Straight nozzle pipe 14 Curved nozzle pipe 15 Straight nozzle tube 16 Curved nozzle tube 17 Straight nozzle tube 18 Curved nozzle tube

Claims (4)

[Claims] 1. A tip nozzle connected to a tip of a concrete transport pipe or the like of a concrete pump truck, the tip nozzle having a plurality of curved nozzle portions and being curved in a zigzag shape. 2. A tip nozzle connected to a tip of a concrete transport pipe or the like of a concrete pump truck, has a plurality of curved nozzle portions, bends in a zigzag shape, and has a built-up portion on a lower inclined surface of an inner wall of the nozzle tube. The tip nozzle of a concrete transportation pipe characterized by having a. 3. In a tip nozzle connected to a tip of a concrete transport pipe or the like of a concrete pump truck, a straight nozzle pipe 11, a curved nozzle pipe 12, a straight nozzle pipe 13, a curved nozzle pipe 14, a straight nozzle pipe 15, and a curved tip from the tip. Nozzle tube 16, straight nozzle tube 17,
The curved nozzle pipes 18 are connected to each other to bend in a zigzag shape, and the inner wall lower inclined surface including the straight nozzle pipe,
A tip nozzle of a concrete transport pipe, wherein a built-up portion is provided near a tip of the straight nozzle pipe 11 and a connection part between the straight nozzle pipe 11 and the curved nozzle pipe 12. 4. The tip nozzle of a concrete transport pipe according to claim 2, wherein the surface of the overlay is made uneven.