JPH0447101B2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention is applicable to vertically downward concrete pouring in the construction of underground structures such as LPG underground tanks, underground substations, tunnel shafts or building basements. Concerning high fall concrete supply equipment.

``Prior Art'' Conventionally, the following methods have mainly been used to supply concrete, mortar, etc. vertically downward.

FIG. 6 shows one such method, in which concrete 23 is placed in a concrete bucket 22 that is raised and lowered by a wire 21 of a winding device such as a winch (not shown) and then transported. The symbol G represents the ground. FIG. 7 shows a system using a steel pipe chute. After receiving concrete 23 from a concrete pump or a mixer truck (not shown) in a hopper part 24, a steel pipe chute 25 hanging down from the hopper part 24 reaches the concrete pouring point underground. This is how to guide concrete. Further, FIG. 8 shows a method using a chute with a valve, and the steel pipe chute 25 is
A plurality of air valves 26 are provided in the middle of the steel pipe chute 25 to close the steel pipe chute 25, and while the concrete 23 is being supplied, the air supply device 27 supplies air to each of the air valves 2.
These air valves 26 are opened and closed by air supplied through a pipe 28 arranged at
The concrete 23 can be held in the steel pipe chute 25 or dropped.

"Problems to be Solved by the Invention" However, each of the above-mentioned conventional methods has the following problems. That is,
In the concrete bucket method, the concrete is placed intermittently by transporting the bucket, and especially when there is a large difference in height between the place where concrete 23 is supplied to the bucket 22 and the place where concrete is poured, it is difficult to raise and lower the bucket 22. This not only takes time and reduces work efficiency, but also poses a risk of falling objects such as concrete, making it impossible to work directly under the bucket 22. In the steel pipe chute method, as the height difference increases, the falling speed of the concrete 23 in the steel pipe chute 25 increases, causing separation of aggregate and degrading the quality of concrete, and making it difficult to place concrete 23 against the impact of falling concrete. There are problems in terms of protection of reinforcing bars, formwork, buried objects, etc. placed at the site, and construction safety. In addition, in the valved chute system, the control mechanism of the air valve 26 is complex and prone to failure, and the air valve 26 is also prone to wear, damage, and concrete blockage, which takes time and affects productivity in recovery work. Furthermore, in order to prevent concrete clogging, the amount of cement and fine aggregate ratio were increased to improve fluidization, which had negative factors in terms of quality and cost.

The present invention was made in view of the above circumstances, and
When implementing high head concrete supply,
To provide a concrete high-head supply device that has good workability (work efficiency), does not cause deterioration of concrete quality, and is mechanically simple.

"Means for Solving the Problems" The present invention includes a cylindrical concrete supply pipe disposed in the vertical direction, and a concrete supply pipe that extends in the axial center direction of the concrete supply pipe while being inclined downward. and a plurality of brake plates arranged alternately in the axial direction of the concrete supply pipe, the concrete supply pipe having a plurality of divided bodies divided into two at least in the radial direction. The braking plates are provided on each of these divided bodies, and the lower tips of the braking plates do not protrude from the dividing surface of the divided bodies, and the inside of the concrete supply pipe is provided with water for washing. The brake plate is characterized in that nozzles are attached to the back side of the brake plate and provided at a plurality of locations, and further, at least the upper surface of the brake plate is made of a resin material, and the supply pipe is made of a resin material. This includes things that are configured.

"Function" The falling speed of the concrete can be suppressed by flowing down over a number of braking plates arranged vertically and facing each other in an alternating manner, and at the same time, the direction of the concrete is changed each time it descends on the braking plates one after another. This way, the materials are kneaded and no separation of aggregate occurs.

Furthermore, since the concrete supply pipe is divided in the radial direction, it is easy to install the brake plate, clean it, etc. Since the brake plate does not protrude from the dividing surface, the brake plate will not be inadvertently damaged even when the supply pipe is disassembled. The washing nozzle effectively washes concrete adhering to the inside of the concrete supply pipe.

"Example" Hereinafter, an example of the concrete high head supply apparatus according to the present invention will be described.

In FIG. 1, what is generally designated by the reference numeral 1 is a concrete high head supply device (hereinafter referred to as concrete supply device). The concrete supply device 1 includes a receiving material hopper 2 and a receiving material hopper 2.
A concrete supply pipe 3 that hangs down from the underground concrete supply pipe 3 and extends to the vicinity of the concrete placement position underground, and a casting pipe 4 that is attached to the lower end of this concrete supply pipe 3.
It is roughly composed of.

As shown in FIG. 1, the concrete supply pipe 3 is provided with connecting flanges 5 at both ends thereof, and any number of concrete supply pipes can be connected by connecting these flanges 5 with bolts. . Further, in this embodiment, the concrete supply pipe 3 can be divided into two parts along the pipe axis direction, as shown in FIG. It is stopped and assembled. Further, on the inner surface 6a of the divided body 6, as shown in FIG. Multiple locations are provided at regular intervals. The brake plate 8 has the inner surface 6a
When the divided bodies 6 are assembled to form the concrete supply pipe 3, the brake plates 8 provided on both divided bodies 6 are They are arranged alternately. The brake plate 8 may have a flat plate shape as shown in FIG. 3, or a concave shape as shown in FIG. 4, for example. Further, as shown in FIG. 2 or 3, these brake plates 8 have their inner lower ends facing the dividing surface of the dividing body 6.
That is, in this case, it does not protrude outward from the assembly flange 7. Further, in this embodiment, the brake plate 8 has a two-layer structure, and the upper layer 8a forming the upper surface of the brake plate 8 is made of a resin (synthetic resin) such as tetrafluoroethylene (commonly known as Teflon). One lower layer 8b is made of steel, and the reinforcing member 9 is welded thereto.

Further, some of the brake plates 8 are provided with nozzles (washing nozzles) 10 on the lower and back surfaces thereof. The nozzle 10 is installed through a pipe 11 from a pump 15 installed on the ground and penetrates the pipe wall of the concrete supply pipe 3, and injects pressurized water or the like into the supply pipe 3 by operating the pump 15. can do. This piping 11
is attached to each concrete supply pipe 3 along the pipe wall thereof, and when connecting the supply pipes 3 to each other, these pipes 11 are also connected by the flexible hose 12 or the like.

To actually assemble the concrete supply device 1 having the above configuration at the construction site, first,
As shown in FIG. 5a, the supply pipe 3 is assembled by connecting the divided bodies 6 two by two on the ground, and the pouring pipe 4 is connected to the lower end of the concrete supply pipe 3 located at the bottom. After that, this concrete supply pipe 3 is placed on a suspension support 13 in a hole 16 communicating with a lower part of the concrete by a lifting means such as a crane (not shown) with the casting pipe 4 facing downward.
Next, as shown in FIG. 5b, another concrete supply pipe 3 is lifted using the lifting means, and its lower end is connected to the upper end of the concrete supply pipe 3 held in the hole 16 by the support 13. Connect to. These concrete supply pipes 3 are connected to each other by bolting the flanges 5 together. At this time, the pipes 11 attached to the wall of the concrete supply pipe 3 are connected to each other by a flexible hose 12. When the concrete supply pipes 3 are successively connected in this way and the desired length is reached, the receiving hopper 2 is connected to the upper end of the uppermost concrete supply pipe 3, and the pump 15 is connected to the upper end of the concrete supply pipe 3.
The assembly of the concrete supply device 1 is completed by installing the concrete supplying device 1 and connecting the piping 11.

In order to pour concrete into an underground pouring site with a high head difference using the above concrete supply device 1, concrete 18 is poured into the receiving material hopper 2 from, for example, a concrete mixer truck 17, as shown in FIG. The concrete 18 moves downward within the concrete supply pipe 3, but at this time,
Since the brake plate 8 is protruded into the concrete supply pipe 3, the concrete 18 does not collide with the brake plate 8 and fall all at once inside the concrete supply pipe 3 due to acceleration. Moreover, as described above, the brake plates 8 are arranged alternately on the left and right sides of the concrete supply pipe 3, so that the concrete 18 is
The direction of the flow changes each time it descends, and when changing direction, the concrete that was flowing ahead collides with the brake plate 8 and temporarily stops there, causing the concrete that follows it to change direction. The mixture is ready to be kneaded. Due to these reductions in the flow rate and the mixing action of the concrete by the brake plate 8, the concrete 18 does not cause separation of aggregates, etc., and therefore, it is possible to supply highly reliable and high quality concrete. can. Moreover, continuous supply is possible without the need for control mechanisms such as valves to control concrete falling speed, or the intermittent supply associated with it, which not only improves work efficiency but also prevents breakdowns or malfunctions of these control mechanisms. Things don't come together. Further, since the upper surface of the brake plate 8 of the present device shown in the embodiment is formed of a resin material, it is possible to prevent the concrete 18 from adhering to the brake plate 8 and to prevent the brake plate 8 from being worn out. Furthermore, by operating the pump 15 and injecting pressurized water or the like into the concrete supply pipe 3 from the nozzle 10, adhering concrete can be cleaned.

Moreover, the concrete supply pipe 3 has divided bodies 6, 6.
Since the concrete supply device 1 is divided in the radial direction and the brake plates 8, 8, . After use, the supply pipe 3 can be divided into the divided bodies 6, 6, and cleaning of the brake plate 8, etc. can be easily performed. Furthermore, since the brake plate 8 is configured so that its inner lower end does not protrude outward beyond the assembly flange 7 of the divided body 6, when the device 1 is disassembled and stored or transported, Even if the flange 7 is turned downward, the brake plate 8 can be placed on a floor or the like without being damaged or deformed, making it stable.
Moreover, efficient storage and transportation can be expected.

Further, since the nozzles 10 are provided on the back side of the brake plate 8, the concrete flowing down inside the concrete supply pipe 3 does not directly collide with these nozzles 10, and damage to the nozzles 10 can be prevented. In addition, since the concrete does not wrap around the back side of the brake plate 8, almost no concrete even comes into contact with the nozzle 10, and clogging of the nozzle 10 due to concrete can be reliably prevented. Further, even when the concrete supply pipe 3 is disassembled into the divided bodies 6, 6, since this nozzle 10 is located on the back side of the brake plate 8, this nozzle 10 may be crushed or bent due to an accidental collision. It is possible to reliably prevent such problems from occurring.

Furthermore, as shown in FIG. 2b, by providing the nozzle 10 on the brake plate 8, the direction of jetting the cleaning water is directed toward the upper surface of the brake plate 8 directly below. Therefore, by attaching these nozzles 10 to all the brake plates 8, the upper surfaces of all the brake plates 8 can be reliably cleaned, and the cleaning effect can be extremely improved.

Note that the concrete supply pipe 3 shown in this embodiment is made of wear-resistant material such as ultra-high molecular weight polyethylene,
It may be constructed from a synthetic resin material with excellent impact resistance.
In this case, the weight ratio is about one-eighth that of steel, so if it is used especially for ultra-high drops, the weight of the equipment will be reduced, and handling during construction will be extremely easy. It is extremely effective in preventing the feed material from adhering to the pipe wall. Moreover, although the concrete supply pipe 3 is illustrated as having a cylindrical shape, the cross-sectional shape of the concrete supply pipe 3 is not limited to this, and the pipe may have a square cross-section, for example.

"Effects of the Invention" As explained above, according to the concrete high-head supply device according to the present invention, the flow rate of concrete is suppressed by the braking plate provided inside the supply pipe, and the concrete flows inside the concrete supply pipe at an accelerated rate. Not only does it not fall all at once, but the direction of flow is changed each time it descends on the brake plate, and the mixture is mixed, so there is no separation of aggregates, which increases reliability. We can supply high quality concrete. Moreover, since the above-mentioned effect is produced using an extremely simple structure in which a brake plate is provided protruding inside the cylindrical supply pipe, there is no possibility of failure or malfunction related to the concrete falling speed control mechanism. In addition, continuous supply is possible without requiring intermittent supply, resulting in high work efficiency. In addition, since the concrete supply pipe is divided into divided bodies in the radial direction, and the brake plate is provided on each divided body,
Not only can the brake plate be easily attached when manufacturing the concrete supply device, but also the brake plate can be easily cleaned after use by dividing into divided bodies. Moreover, since the inner lower end of the brake plate does not protrude outward from the dividing surface of the divided body, there is no risk of damage or deformation of the brake plate when disassembling the device for storage or transportation. It can be placed on the floor or the like without any problems, allowing for stable and efficient storage and transportation.

Furthermore, since a water washing nozzle is provided inside the concrete supply pipe, the concrete adhering to the inside of the concrete supply pipe can be easily and reliably washed by spraying pressurized water or the like with this nozzle. Moreover, since the water washing nozzles are installed on the back side of the brake plate, the concrete flowing down inside the concrete supply pipe does not directly collide with these water washing nozzles, which not only prevents damage to the nozzles, but also prevents the concrete from colliding with the water washing nozzles. It is also possible to reliably prevent nozzle clogging. In addition, even when the concrete supply pipe is disassembled into the divided bodies, it is possible to reliably prevent problems such as crushing or bending caused by something accidentally colliding with the washing nozzle. It is effective.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing concrete placement by a concrete high-head supply device according to an embodiment of the present invention. Figure 2 a shows concrete supply pipe 3
FIG. 2b is a partially sectional front view of the concrete supply pipe 3, FIG. 3 is a partial perspective view of the divided body 6, and FIG. 4 is a partial perspective view of the divided body 6. 5a to 5c are cross-sectional views showing the assembly procedure of the concrete high head supply device 1. 6 to 8 are sectional views showing conventional examples, respectively. 1... Concrete supply device, 2... Material receiving hopper, 3... Concrete supply pipe, 4... Concrete pipe,
6... Divided body, 7... Assembly flange (divided surface), 8... Brake plate, 10... Nozzle (washing nozzle), 18... Concrete.

Claims (1)

[Scope of Claims] 1. A cylindrical concrete supply pipe disposed in the vertical direction, and an axis line inside the concrete supply pipe extending in the direction of the axial center of the concrete supply pipe while tilting downward. A concrete high-head supply device comprising a plurality of brake plates arranged alternately in the direction, the concrete supply pipe being constituted by a divided body divided into at least two parts in the radial direction, and the brake plates being divided into two parts in the radial direction. The lower tips of these brake plates do not protrude from the dividing surface of the divided body, and inside the concrete supply pipe, a water washing nozzle is provided on the back side of the brake plate. A high head concrete supply device characterized by being attached to the side and provided at multiple locations. 2. Claim 1, wherein at least the upper surface of the brake plate is made of a resin material.
Concrete high head supply device as described in Section 1. 3. The concrete high head supply device according to claim 1 or 2, wherein the supply pipe is made of a resin material.