JP3220825B2 - Hardener spraying machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solidifying agent sprayer used for improving a surface layer of a ground.

[0002]

2. Description of the Related Art When building or paving, if the strength of the ground is lower than the design strength, it is necessary to improve the ground.
As one of the methods for such ground improvement, there is a method in which a solidifying agent (such as cement) is sprayed on the surface of the ground and mixed with soil. This makes the soil harder and able to withstand the upper loads. This method is different from the method of replacing the soil with the soil of the construction ground and the strong soil and others.Since it is only necessary to stir the soil and the solidifying agent on the spot without largely moving the existing soil, it is simple and easy. It is well known as a low cost construction method.

However, since this solidifying agent is usually a powder,
It is very difficult to evenly spray the ground to be processed. In particular, the spraying amount of the solidifying agent is strictly determined by the design value of the ground improvement, so if it is not evenly spread, even if the predetermined amount is sprayed as a whole, a part below the design value will always occur, There is a low part.

[0004] and this scatter work is conventional, Yumbo
(Registered trademark, the same applies hereinafter) and the like, a bag containing a solidifying agent is hung behind, a hole is made in the lower portion of the bag, and the solidifying agent is dropped while traveling on the ground to be processed. However, this method does not allow Yumbo or the like to change speed or stop. This is because, when the speed is reduced, the amount of the drop increases in that portion.

For this reason, a spraying machine 11 as shown in FIG.
Self-propelled devices have been developed and used. This is a caterpillar for driving (registered trademark, the same applies hereinafter) 12
A belt (conveyor) 15 for storing the solidifying agent 13, which is located on the upper side thereof, for feeding the solidifying agent 13, and an openable gate 16 for stopping the discharge of the solidifying agent 13. are doing. When the belt conveyor 15 rotates, the solidifying agent 13 located above the belt conveyor 15 is carried out to the outlet side, passes through the gate 16, and falls on the road. When the unloading speed of the belt conveyor is controlled by the running speed of the main body, a fixed amount of the solidifying agent can be sprayed regardless of the speed of the main body.

[0006]

However, even such a sprayer has the following disadvantages. First, when the speed of the main body is reduced (often caused by partial soft ground, obstacles such as rocks, etc.), the speed of the conveyor belt is reduced accordingly, but the solidifying agent is forced by gravity or inertia from the discharge port. Can not be reduced to the theoretical amount. Also,
Even if the gate opening degree is changed, the amount of gravitational drop is not constant, that is, a phenomenon occurs in which a large amount of drops intermittently occur, and appropriate control cannot be performed. Further, since the position of the gate itself is different from that of the outlet, even when the gate is stopped and the gate is closed, the solidifying agent from the gate to the outlet drops.

Furthermore, even if the speed of the main body increases and the conveying speed of the belt conveyor increases because the solidifying agent slides on the belt conveyor, the conveying amount is not as theoretical and it is difficult to perform appropriate control as described above. In the end, the amount could only be controlled in a very narrow range.

The width of the solidifying agent to be sprayed is basically fixed in the case of the conventional spraying machine. Therefore, for example, when an attempt is made to spray on the ground such as a narrow road, the width of the road is reduced by the width of the spraying machine. Often it is not an integral multiple of the width. In such a case, when the normal spraying is performed, a portion that is sprayed repeatedly is formed or a portion that cannot be sprayed is formed. Therefore, in practice, the width of the chute provided at the conveyor outlet is changed to cope with this. However, in order to allow uniform spraying even if the chute width is changed, theoretically, the amount of the solidifying agent discharged from the conveyor must be changed in proportion to the change in the chute width. Such adjustment is difficult, and even if it is adjusted by the shot width, it is actually difficult and often fails.

Accordingly, there has been a long-felt need in the art for a solidifying agent sprayer that does not have the above-mentioned disadvantages.

[0010]

In view of the above situation, the present inventor has completed the present invention's spraying machine as a result of intensive studies, and is characterized by a conveyer for sending out a solidifying agent. In the apparatus comprising an upper hopper, the conveyor is a plurality of screw conveyors arranged substantially in parallel along the spraying direction, and the individual screw conveyors constituting the conveyor are operated independently. In that it has a switch.

Here, the "hopper" is a container for storing the solidifying agent and discharging the solidifying agent from below, and is usually configured such that the lower side is largely open and the conveyor is at the bottom. I have. In the sprayer of the present invention, the shape and structure of the hopper are not particularly characteristic and are not limited. However, it is preferable that the outlet of the hopper, that is, the structure of the portion regulated by the hopper inner wall and the conveyor is different from the conventional one, in conformity with the structure of the conveyor (described later).

[0012] The "conveyor" is composed of a plurality of screw conveyors arranged substantially in parallel along the spraying direction. The screw conveyor has screw blades around the axis,
This is a kind of transport mechanism that sends the transported material along the screw surface by rotating the shaft. In the case of the present invention, by arranging a plurality of the screw conveyors in parallel,
The hardener is spread widely and uniformly. Basically, the number of installations should be two or more, but as the number increases, the spraying width can be wider and more evenly sprayed. However, if the number of installations is increased, the sprayer becomes larger. There is also a disadvantage that work cannot be performed in a narrow place, or it becomes expensive. In the range where the inventor conducted experiments, about 4 to 8 pieces were suitable.

[0013] The conveyor may be provided with various accessories such as a "gutter", "damper", "chute", etc., which are included in the ordinary screw conveyor, or depending on the properties of the solidifying agent, may be provided above the screw conveyor. An anti-consolidation plate may be provided to facilitate the transport of the solidifying agent.

Each of the plurality of screw conveyors has an independent switch so that only some of them can be selectively operated. For example, taking as an example a solidifying agent sprayer having six screw conveyors, the maximum width of spraying is when all the conveyors are operated, and the following five, four, and the number of operating conveyors If it is reduced, the spread width can be reduced. Further, even in the case of the same four spray widths, it is preferable that any four of the six sprays can be operated freely according to the situation. Furthermore, although each conveyor has an independent switch, a main switch may be provided separately to stop the operation of all the conveyors. The type and structure of the drive source of the screw conveyor are not limited at all.

However, since the amount of the solidifying agent to be sprayed varies depending on both the rotation speed of the screw conveyor and the moving speed of the sprayer main body, it is necessary to control the rotation speed of the screw conveyor by the speed of the main body. preferable. The control method may be to mechanically connect by gears or the like so as to have a fixed ratio with the main body speed, or to calculate the transport speed from the main body speed data by a computer and to use the data as the belt driving source ( Motor, etc.).

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to embodiments. FIG. 1 is a schematic side sectional view showing a solidifying agent spraying machine 1 according to the present invention (hereinafter, referred to as “the present invention spraying machine 1”). However, only the gist of the present invention is shown, and the driving unit and the driving unit of the main body are omitted. The sprayer 1 of the present invention of this example
It is mounted on a caterpillar type self-propelled machine (not shown), and a screw conveyor 2 on the lower side is mounted on the self-propelled machine in a running direction (left side in the figure). Above the screw conveyor 2 is a large hopper 3, where the solidifying agent is stored. Since the solidifying agent is usually a powder, a consolidation preventing plate 4 for preventing consolidation is provided so as to cover the screw conveyor 2 from above. The right end of the screw conveyor 2 is a discharge portion of the solidifying agent, where a damper 5 is provided, and can be closed when not spraying.

FIG. 2 is a longitudinal sectional view of the apparatus shown in FIG. As is clear from the figure, in the case of this example, the screw conveyor 2
Are lined up with a slight gap. A discharge guide ridge 6 is provided in this gap so that the solidifying agent does not stop and solidify. Further, it can be seen from this figure that the anti-consolidation plate 4 is located above each screw conveyor 2 and has an inverted V-shaped cross section.

In FIG. 1, when the screw conveyor 2 rotates, the solidifying agent on the belt is conveyed rightward, and the damper 5 opens and falls. In addition, screw conveyor 2
When the rotation of the screw conveyor 2 stops, the screw blade 21 of the screw conveyor 2 becomes a kind of weir, and the solidifying agent thereafter does not fall. Therefore, basically, the dispersion of the solidifying agent can be almost completely stopped only by stopping the rotation of the screw conveyor 2. However, it is not preferable for the self-propelled machine equipped with the spraying machine 1 of the present invention to run off without performing spraying work, and it is not preferable that the solidifying agent leaks out. It is preferable to provide a damper 5 which can be opened and closed appropriately.

In this embodiment, switches for stopping the operation of the individual screw conveyors 2 and opening and closing the dampers 5 are all installed near the solidifying agent discharge port of the sprayer 1 of the present invention. If a dedicated machine equipped with running equipment is used instead of being mounted on a running machine, it can be easily installed in a driver's seat (not shown).

FIGS. 3 (a), 3 (b) and 3 (c) schematically show a state where the self-propelled machine C equipped with the sprayer 1 of the present invention is spraying a solidifying agent. FIG. 1A in which all the six screw conveyors 2 are operated is the maximum value of the spray width of the sprayer 1 of the present invention. FIGS. 3B and 3C show a state in which only four screw conveyors 2 are operated, and in FIG.
The two screw conveyors 2 on the right in FIG.
Has stopped rotating. (The damper 5 is not shown, but it goes without saying that the stopped screw conveyor 2 is closed.)

[0021]

According to the sprayer of the present invention, there are the following significant advantages. Since the screw conveyor is used, the spraying amount can be appropriately controlled, and stopping and the like are easy. Since only a plurality of screw conveyors can be selectively operated as appropriate, the spray width can be set almost freely. Therefore, it is easy to spray the ink on the area having a small width. The apparatus itself can be manufactured at low cost, and various wastes resulting from the conventional non-uniform application amount can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an example of a sprayer according to the present invention.

FIG. 2 is a schematic longitudinal sectional view of the example shown in FIG.

3 (a), 3 (b) and 3 (c) are all schematic cross-sectional views showing a state where a self-propelled machine equipped with a sprayer of the present invention is actually spraying a solidifying agent.

FIG. 4 is a schematic sectional view showing an example of a conventional sprayer.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 solidifying agent sprayer 2 screw conveyor 21 screw blade 3 hopper 4 anti-consolidation plate 5 damper 6 discharge guide ridge

Claims (1)

(57) [Claims] 1. An apparatus comprising a conveyor for feeding a solidifying agent and a hopper on the upper side thereof, wherein the conveyor is a plurality of screw conveyors arranged substantially in parallel along a spraying direction, and each of the conveyors constituting the conveyor is Wherein each of the screw conveyors has a switch for operating the screw conveyor independently.