JPH10141578A - Elbow protector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the scatter of ready-mixed concrete at the time of the ready-mixed concrete being jetted by mounting an elbow protector, formed of a polymeric elastic body shaped along the curve of a bent pipe, on the outer surface of a bent pipe part of a ready-mixed concrete transport pipe. SOLUTION: A die is designed and manufactured to mold an elbow protector 1. The shape is semicircular (4) with cross section provided with thickness, and both ends 8 of a bent pipe are made longer by about 15mm than a quarter of a circumference. Thickness is 5mm at the center of the semicircular shape 4 and is reduced of itself to 2mm along both sleeves 9 from the center. At the time of mounting this elbow protector 1 to a direct feed bent pipe of a round transport pipe of a concrete pumping vehicle with a boom, three belts are wound on appropriate places of the mounted elbow protector 1 and tightened by a fitting fitted to one end of each belt. A scatter of ready-mixed concrete at the time of the ready-mixed concrete being jetted can therefore be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transport pipe for transporting a fluid, and more particularly to a transport pipe for a concrete pump truck equipped with a boom for pumping raw concrete. The present invention relates to a protector for preventing the ready-mixed concrete from spouting and scattering.

[0002]

2. Description of the Related Art Conventionally, a concrete pump truck with a boom has been widely used for pumping ready-mixed concrete in construction or civil engineering work. Concrete pump trucks with booms usually require 10 to 50 kg because of the need to send ready-mixed concrete to narrow sites and higher and more distant places.
Pumping is performed at a discharge pressure of f / cm ² . The transport pipe for pumping uses an upper refraction boom so that it can be easily stored in a concrete pump truck with a boom, and a three-stage type that makes it easy to bend and extend even in a limited narrow space is mainstream. It is. Therefore, six to seven elbow-shaped curved pipes are used as the curved pipes of the transport pipe.

[0003]

A concrete pump truck with a boom for pumping ready-mixed concrete has a discharge pressure of 10 m.
Since it is ５０50 kgf / cm ² , the ready-mixed concrete is being pumped at a high pressure. The inner surface of the direct pipe of the transport pipe is worn by the flow of ready-mixed concrete. Especially,
The outer curved portion of the inner surface of the bent pipe that is bent at a substantially right angle is particularly severely worn.

[0004] In addition, the ready-mixed concrete contains pebbles, gravel and the like, and these portions are shaved off by these and become thin and have holes. As the small holes are formed, the holes gradually become larger, and the ready-mixed concrete that is being pumped at a high pressure is ejected and scattered from the larger holes. Some steel plates are welded with a steel plate that matches the outer shape of the curved pipe in order to extend the period until the hole is made even slightly and extend the life of the curved pipe. However, this plate only slightly extends the life of the hole, and eventually becomes broken due to the hole.

[0005] When a hole is made, ready-mixed concrete that is being pumped at a high pressure may erupt and scatter with violent momentum. In the case of the construction of a building, the ready-mixed concrete spouts onto the glass window of the adjacent building or the wall of the building. In addition, it often damages a vehicle or the like while traveling or parked. The cost of guaranteeing these damages is considerable. For the builder, it suffers a great deal of money or credit. These damages must not be caused to cause damage to private houses or the surrounding residents. Therefore, construction site supervisors and workers are exhausted more than necessary.

In the case where a hole is pierced during the pumping of the ready-mixed concrete and the ready-mixed concrete starts to erupt, the old tire of a light car cut into approximately four equal parts, which has been prepared in advance, is bent into a curved pipe having a hole. It is attached and tightened with a wire, or a commercially available blue synthetic resin waterproof sheet or the like is wrapped, and a wire, a belt, or other appropriate tightening equipment is used to tighten and prevent scattering.

[0007]

Means for Solving the Problems On the outer surface of a curved pipe portion of a transport pipe of a concrete pump truck with a boom for transporting ready-mixed concrete, a cross-sectional shape is a substantially semicircular shape having a thick wall, and the cross section follows a curved curve of the curved pipe. An elbow protector made of a polymer elastic body having a different shape is attached, and several places are tightened appropriately using a tightening belt.

[0008]

[Effect] An elbow protector made of a polymer elastic body conforming to the outer shape of the curved pipe is attached to the outer surface of the curved pipe of the ready-mixed concrete transport pipe in advance, and the elbow protector is tightened with a tightening belt to protect the pipe. If a hole is formed in the curved pipe during one operation and the ready-mixed concrete begins to erupt, the polymer elastic body is an elbow protector.As the polymer elastic body deforms, a gap is formed between the curved pipe and the elbow protector. Arises
The pumping force decreases sharply, and the fresh concrete only seeps out of the gaps without scattering.

[0009]

Embodiments will be described below. Before the full-scale molding of the elbow protector (1), a test was conducted on the effect of the elbow protector (1) to prevent scattering. First, a 5 mm thick rubber sheet is rolled and vulcanized (a non-vulcanized rubber sheet is wound around a curved tube, a wet cloth is wrapped from above and put into a vulcanizing can and vulcanized) to cure the rubber sheet. It was molded and mounted on the outer surface of a curved pipe (2) having a hole connected to the direct transport pipe (2) of a round transport pipe, and tightened appropriately at three places using a belt (6).

In order to prevent the agglomeration of the ready-mixed concrete, about 3 m ^{3 of} ready-mixed concrete in which aggregate was mixed with fly ash was prepared, and a test was carried out using a squeeze type pump truck. As a result, the elbow protector (1) is deformed without the ready-mixed concrete being scattered, and a gap is formed between the curved pipe (2) and the elbow protector (1), and the fresh concrete falls to the foot from the gap. The results were extremely good.

[0011] Based on the above results, the molding method was switched to a mold, a mold was designed and produced, and an elbow protector (1) for 5B was molded. The shape is a semicircular shape (4) having a cross section having a thickness as shown in FIG. 1, both ends (8) of the curved tube (2) are both longer than a quarter of the circumference by about 15 mm, and the thickness is The center of the semicircular shape (4) is 5 mm, and the thickness is naturally reduced from the center to 2 mm along both sleeves (9).

On the other hand, a belt (6) for tightening the elbow protector (1) mounted on the curved pipe (2), which is a commercially available acrylic synthetic fiber and has a metal stopper (7) at one end. The belt (6) used is used. The above-mentioned elbow protector (1) is mounted on a direct transport pipe (2) curved pipe (3) of a round transport pipe of a concrete pump truck with a boom (10), and is installed at an appropriate position of the mounted elbow protector (1). Hang the three belts (6) and tightly tighten them with the stoppers (7) attached to one end of the belt (6).

The elbow protector (1) implemented this time is formed of extensible rubber. However, the present invention is not limited to this, and short fibers may be mixed in the elastic polymer. Then, a cloth may be inserted as a core material.

[0014]

According to the present invention, it is possible to extend the period in which a curved transport pipe for transporting ready-mixed concrete is perforated.
It cannot be prevented that a hole is finally formed. Accordingly, a situation in which the fresh concrete is erupted and scattered due to a hole in the curved pipe portion always occurs. The present invention has made it possible to prevent scattering of the ready-mixed concrete when such a situation occurs and the ready-mixed concrete gushes.

By attaching an elbow protector to a curved pipe of a transport pipe of a concrete pump truck with a boom in advance, it is possible to prevent the spouted fresh concrete from scattering. It uses the extensibility of the polymer elastic body, and when the ready-mixed concrete begins to erupt, the elbow protector is deformed, creating a gap between the bent pipe and the elbow protector, and the pumping force is rapidly reduced and It does not ooze out of the concrete gaps and fall to the point of falling.

Therefore, there is no possibility of landing on a glass window of an adjacent building or a wall surface of the building. Furthermore, there is no harm to vehicles or pedestrians during parking or running. Moreover,
The greatest effect is that the production cost is low and it is easy to attach and detach, but it greatly contributes to safety and security. Construction site supervisors and workers do not need to use extra nerves.

[Brief description of the drawings]

FIG. 1 is a front view of an elbow protector according to the present invention. (B) A-A view of (a).

FIG. 2 is a view attached to a curved tube.

FIG. 3 is a concrete pump truck with a boom.

[Explanation of symbols]

 1. Elbow protector 2. 2. Direct delivery pipe Curved pipe Semicircular shape 5. Curve 6. Belt 7. Stopper 8. Both ends 9. Sleeves 10. Concrete pump truck with boom

Claims (3)

[Claims] 1. A cover mounted on the outer surface of a curved pipe (3) connected to a direct pipe (2) of a round transport pipe, wherein the cross-sectional shape of the cover is a substantially semicircular shape (4) having a thickness, An elbow protector (1) characterized in that the elbow protector (1) is made of an elastic polymer having a shape along a curve (5) of a curved tube (3). 2. An elbow protector (1), wherein the polymer elastic body according to claim 1 is an elastic rubber or a soft resin. 3. An elbow protector (1), wherein short fibers are mixed or a cloth is inserted into the elastic polymer according to claim 1.