KR20020024028A - Sand spreading apparatus for ground of weakness using air-pressure - Google Patents

Abstract

PURPOSE: A sand spreader for a soft ground is provided to form a sand layer for reinforcing the ground by applying compressed air to spray sand on the ground without alternative reinforcement such as high tensile matt. CONSTITUTION: The spreader comprises a blower(4) connected to a driving motor(3) by a belt(5) and having an inhalation silencer(7) at a suction tube(4a) of the blower(4) and a safety surface(8a) and an exhaustion silencer(8) at an exhaustion tube of the blower formed with a flexible joint(4b). The exhaustion silencer(8) has a check valve(9) and a stop valve(10) interposed at front end of the silencer(8). The sand spreader has a sand conveyer pipe(12) integrated with a blowing pipe(11) at front end of the blowing pipe. A sand supplying hopper(14) having a rotary valve(13) inside an outlet(14a) of the sand conveyer pipe(12) is applied to upper side of the pipe(12). In addition, the spreader has a sand spreading pipe(15) integrated to the conveyer pipe(12).

Description

Sand spreading apparatus for ground of weakness using air-pressure}

The present invention relates to a sand spreader for soft ground using pneumatic pressure, and more specifically, the sand introduced into the sand conveying pipe through the feeding hopper is first conveyed by the air blowing force of the blower, and the sand thus transported is sand spraying pipe By spraying at high speed by using compressed air injected into the inside, large amount of sand can be installed on the soft ground even if sand is not sprayed with water, which makes the groundwater and surface water drainage function very good. Pneumatic pressure to make sand layer to be formed on super soft ground in a short time, and to minimize the size of sand laying equipment and simplify its structure to make the operation and maintenance of equipment easy and reduce the operating cost of equipment. It relates to sand spreader for soft ground using.

In general, the areas formed by reclamation, dredging, or reclamation of coasts, rivers, lakes, and harbors not only form wetlands mixed with water and viscous soils or water, but also contain void water in the ground. Therefore, since the overall strength of the ground becomes very weak, a soft ground is formed. In order to use such an area as an industrial area or a commercial area, the work of improving the soft ground to be suitable for the site utilization must be preceded.

As described above, in the method for improving the soft ground, a sand pillar or a drain paper board is inserted into the ground by a casing, such as a sand drain method or a paper darin method. Vertical drainage method to promote consolidation of the soft ground by discharging it to the ground, and sand compaction pile to reinforce the bearing capacity along with the discharge of underground gap water by forming sand compaction pile on the ground. Various methods such as construction method, forced replacement method by santo landfill, or lime column method using lime pillar are adopted in various ways depending on the site conditions. The vertical drainage method described above is widely used in the method.

In order to implement the above-mentioned soft ground improvement method, various heavy equipment and a large amount of equipment should be carried on the soft ground. Therefore, the ground surface of the soft ground should be reinforced first. Form trenches on the surface to naturally dry the moisture on the surface, and apply sand to the bulldozer with high-strength special mats (Gio-grid, Gio-mat, Polyester mat, etc.) on the surface of the soft ground. A method of laying sand on the soft ground and a method of spraying sand together with water on the ground surface of the soft ground on which the special mat is attached are used.

In the conventional soft ground reinforcement method as described above, a sand sprayer using a jet pump device is mainly used for spraying sand together with water. The sand sprayer is a sand conveying pipe on the outlet side of a nozzle to which high pressure water is sprayed. If the outlet side of the pipe is installed in the form of a double pipe and the pressure of the nozzle outlet side drops to a vacuum state as the high pressure water is ejected at high speed through the small row hole, the pressure difference between the outlet side and the inlet side of the sand feed pipe As the sand is sucked in from the inlet of the sand conveying pipe, the principle of the jet pump is used to inject sand with water.

When sand is sprayed on the soft ground together with water using the conventional sand sprayer as described above, it is possible to form a sand layer even when the heavy equipment such as a bulldozer does not enter the soft ground, and thus the softness of the heavy equipment. It is possible to reinforce the soft ground in a faster time than the natural drying method by the trench, but to prevent excessive settlement and elevation of the ground, but the weight of the sand layer stacked on the top of the soft ground becomes somewhat heavy by the specific gravity of water In order to prevent settlement or elevation of the ground, there was a problem in that a separate reinforcement facility such as a high-strength mat was to be installed on the soft ground. There was a problem that can not be.

In addition, since a large amount of water is sprayed on the ground surface of the soft ground with sand, a part of the water sprayed with the sand remains on the ground surface of the soft ground, and the rest penetrates into the ground pore water from the ground surface of the soft ground. As the ground pore number is increased, even if the sand layer is formed quickly on the ground of the soft ground, there is a problem that the improvement equipment of the soft ground cannot be added until the remaining water on the ground is completely drained. Even after making, there was a problem in that a considerable amount of time was spent in the discharge of underground pore water, thereby causing a delay in the overall construction period due to the improvement of the soft ground.

In addition, a conventional sand sprayer using a jet pump is a device for compressing water at high pressure, a device for spraying high pressure water through a nozzle, a device for transporting sand through a sand conveying pipe, and other peripheral devices for their operation. In addition to the complicated intertwined structure, the operation principle of the jet pump is also different from the operation principle of the general pump, which makes it difficult to repair the sand sprayer due to the operation and breakdown. There was a problem that the overall cost according to the operation of the sand injector was increased because the amount of sand per unit time is reduced by the amount of mixed water.

The present invention has been made in order to solve the conventional problems as described above, the sand spreader for soft ground using pneumatic pressure according to the present invention is primarily transported by the air blowing force of the blower sand introduced into the sand transport pipe through the input hopper The sand thus transported is sprayed at high speed by using compressed air injected into the sand spray pipe, so that a large amount of sand can be installed on the soft ground without sand being sprayed with water. Therefore, it is possible to form sand layer, which has very good drainage function of underground pore water and surface water, even on super soft ground in a short time, and to simplify operation and maintenance of equipment by minimizing sand laying equipment and simplifying its structure. It is a technical problem of the present invention to reduce the operating cost of equipment.

According to the present invention for achieving the above technical problem, a suction silencer is connected to the suction pipe side of the blower connected as the drive motor and the belt, the safety valve and the discharge silencer is connected to the discharge tube side of the blower made of a flexible joint, The blower pipe is connected to the distal end of the discharge silencer with a check valve and a stop valve interposed therebetween, and at the distal end of the blower pipe, a sand feeder is integrally connected to the blower pipe, and the sand feeder is in communication with the sand feeder. A sand hopper having a rotary valve is provided inside the outlet, and a sand spray pipe is integrally connected to the sand transport pipe at the tip of the sand transport pipe, and 4 to 12 are connected to the sand transport pipe and the sand transport pipe. Compressed air injection nozzles installed through the outer circumference of the joint It characterized.

1 is a side cross-sectional view showing a sand spreader for soft ground according to the present invention.

Figure 2 (a) and (b) is a side view showing the installation state of the compressed air injection nozzle according to each embodiment of the present invention.

<Explanation of symbols for main parts of drawing>

1: Soft ground 2: Sand 3: Drive motor

4: blower 4a: suction line 4b: flexible joint

5: belt 6: pedestal 7: suction silencer

8: discharge silencer 8a: safety valve 8b: pressure gauge

9 Check Valve 10 Stop Valve 11 Blowing Tube

12: sand transfer pipe 12a: connection portion 13: rotary valve

14: hopper 14a: outlet 15: sand spray pipe

16: compressed air injection nozzle 17: support 20: sand spreader

The present invention for achieving the above object will be described in detail with reference to the accompanying drawings.

1 is a side cross-sectional view showing a sand spreader for soft ground according to the present invention, Figure 2 (a) and (b) is a side view showing the installation state of the compressed air injection nozzle according to each embodiment of the present invention.

As shown in FIG. 1, the sand spreader for soft ground using pneumatic according to the present invention has a pedestal 6 having a drive motor 3 and a blower 4 connected to the drive motor 3 and the belt 5. It is fixed to the upper portion of each, the suction pipe 4a side of the blower 4, the suction silencer (Silencer, silencer) 7 is connected and installed, the discharge pipe side of the blower (4) consisting of a flexible joint (4b) The discharge silencer 8 is connected, and a safety valve 8a is provided between the flexible joint 4b and the discharge silencer 8 to keep the pressure of the air blown from the blower 4 constant.

In addition, a blower pipe 11 for discharging the air blown from the blower 4 is connected to the distal end of the discharge silencer 8, and the blowing pressure is checked between the discharge silencer 8 and the blower pipe 11. Additional devices consisting of a pressure gauge (8b), a check valve (9) for preventing backflow of blown air, and a stop valve (10) for opening and closing the flow of blown air are sequentially installed.

In addition, a sand transfer pipe 12 having a diameter larger than that of the blower tube 11 is integrally connected to the blower tube 11 at the distal end of the blower tube 11, and the sand 2 is introduced above the sand transfer tube 12. The hopper 14 is installed to be supported by the support 17, and the rotary valve 13 is rotatably installed inside the discharge port 14a communicating with the sand transport pipe 12 by being installed below the input hopper 14. It is installed and connected to an unshown drive such as a motor.

In addition, a sand injection pipe 15 having a diameter smaller than that of the sand transport pipe 12 is integrally connected to the sand transport pipe 12 at the front end of the sand transport pipe 12, and the sand transport pipe 12 and the sand injection pipe ( The tapered connection portion 12a of 15) is connected to an air compressor (not shown), and four to twelve compressed air injection nozzles 16 for injecting compressed air into the sand spray pipe 15 have an outer circumferential surface of the connection portion 12a. It consists of a configuration installed through.

The reason for making the diameter of the sand transport pipe 12 larger than the diameter of the air blower 11 in the sand spreader 20 of the present invention as described above is that even if the pressure of the air blown from the air blower 11 is slightly reduced, In order to transfer a large amount of sand (2) from the inside (14) to the inside of the sand conveying pipe 12, and to transport the sand (2) even if the air pressure inside the sand conveying pipe 12 is slightly lowered In addition to sufficient pressure, a kind of vacuum phenomenon is generated on the connection part 12a side by the high pressure air injected into the compressed air injection nozzle 16, so that the transfer force of the sand 2 is changed according to the operation principle similar to that of the jet pump. In order to compensate, the air pressure drop inside the sand feed pipe 12 is not a big problem.

In addition, the reason for limiting the number of installation of the compressed air injection nozzle 16 to 4 to 12 is to inject the sand 2 transferred to the sand injection pipe 15 through the sand transport pipe 12 at an equal pressure. In order to install at least four compressed air jetting nozzles 16 at an angle of 90 ° along the outer circumferential surface of the connecting portion 12a having a circular cross section, the larger the number of the compressed air jetting nozzles 16 is, Although it is suitable for high-speed injection of 2), it is limited by the installation space of compressed air injection nozzle 16 and the capacity of air compressor, so it is up to 12 compressed air at an angle of 30 ° along the outer circumferential surface of the connection part 12a having a circular cross section. It is preferable to provide the injection nozzle 16.

In addition, in order to minimize the loss of the injection force that may be generated by the high-pressure compressed air injected from the compressed air injection nozzle 16 collides with the sand (2) transferred into the sand injection pipe 15, compressed air injection The nozzle 16 is preferably installed to be inclined as far as possible to the rear side (sand feed pipe side) in consideration of the tapered angle of the connecting portion 12a. As shown in FIG. 2A, the compressed air injection nozzle ( 16 may be arranged on the same line as the outer circumferential surface of the connecting portion 12a, but as shown in (b) of FIG. 2, spirally disposed along the outer circumferential surface of the connecting portion 12a to the interior of the sand spray pipe 15. It is preferable that the flow of injected compressed air be in a tornado shape so that the resistance to friction and the conveying force of the sand 2 are increased.

If described in detail with reference to the accompanying drawings the working relationship of the present invention made of the above configuration as follows.

First, the sand sanding machine 20 of the sand sanding machine 20 according to the present invention is installed on the outer side of the soft ground (1) at the same time so that the sand spraying pipe 15 toward the soft ground (1) side In this state, the sand 2 is loaded into the hopper 14 using a loading equipment such as a dump truck or a pay loader, which is a type of shovel type loader.

After the sand 2 is loaded inside the feed hopper 14 as described above, the driving motor 3 is operated to force air to the sand transport pipe 12 from the blower 4 through the blower pipe 11. At the same time, by operating an air compressor (not shown) connected to the compressed air injection nozzle 16, the compressed air is injected at a high speed through the sand spray pipe 15, thereby transferring the sand 2 by the blower 4 In addition, the sand sander 20 is set in a state in which sand (2) can be sprayed by compressed air.

In the above state, while the rotary valve 13 installed inside the discharge port 14a of the injection hopper 14 is rotated, the sand transfer pipe 12 below the discharge port 14a is transferred to the sand 2 loaded on the discharge hopper 14. When dropped into the inside, the sand (2) dropped into the sand pipe (12) by the air pressure blown from the blower pipe 11 is forcibly transferred to the sand injection pipe 15 side, the sand (2) thus transferred ) Is injected at high speed along the sand injection pipe 15 by the compressed air injected from the compressed air injection nozzle 16, so that the sand 2 can be installed on the ground surface of the soft ground 1.

As described above, when sand (2) is deposited on the ground surface of the soft ground (1) using the sand sanding machine (20) of the present invention, the sand per unit time sprayed through the sand spray pipe (15) The injection amount can be easily adjusted by adding or subtracting the rotational speed of the rotary valve 13 and the air pressure injected through the compressed air injection nozzle 16, but as one specific embodiment, 4 to 6 compressed air injection nozzles 16 are provided. When the air pressure of the compressed air injected through each injection nozzle 16 is 60 bar, the injection amount of sand (2) per unit time through the sand injection pipe 15 having a diameter of 10 cm maximum 1000kg / min, and there was some difference depending on the particle size of sand (20), but the maximum spraying distance of sand (2) was 3 ~ 4m.

As described above, when the sand 2 is installed on the ground surface of the soft ground 1 using the sand spreader 20 according to the present invention, sand is sprayed together with water at the maximum spraying distance of the sand 2. Although it is somewhat lower than the conventional jet pump, it is possible to easily install a very large amount of sand (2) per unit time on the soft ground due to the air pressure of the compressed air, thereby additional heavy equipment such as a bulldozer soft ground Even without entering the phase (1), it is possible to form a sand layer for reinforcement of the soft ground (1) very quickly.

In addition, the sand layer formed by the sand spreader 20 of the present invention is that only the sand (2) is stacked on top of the soft ground (1), soft compared to the conventional case where the sand (2) is sprayed with water The weight of the sand layer applied to the ground (1) becomes very small, and this makes it possible to easily construct the sand layer without installing a separate reinforcement facility such as a high tension mat on the ground surface of the soft ground (1). In the construction method of the sand layer on the super soft ground, such as wetlands, sand sander 20 according to the present invention can be easily applied.

Since only sand (2) is installed on the soft ground (1) as described above, as soon as the construction of the sand layer is completed, it is possible to put various improved equipment into the soft ground (1), and the soft ground by the introduced improved equipment. (1) If the underground pore water is drained, the sand layer acts as an excellent horizontal drainage immediately, and the ground pore water can be easily drained, and even in the case of ultra soft ground such as wetlands, After forming the sand layer on the super soft ground by acting as a drainage material, the improved equipment can be added within a relatively fast time, thereby reducing the overall construction period due to the improvement of the soft ground (1).

And, in the sand sanding machine 20 according to the present invention, a blower by the blower 4 is connected to the rear side of the sand conveying pipe 12, and the sand by the hopper 14 is installed on the upper side thereof. As the input device is installed in a connected type, and the sand spraying device by compressed air is installed in the front side, the overall structure is much simpler than the conventional jet pump type sand sprayer, and the principle of operation is also general blowing. Since the operation principle of the apparatus is almost the same, it is easy to operate and repair the sand spreader.

In addition, since the compressed air is used for the injection of the sand 2, even if the equipment is downsized, a large amount of sand 2 can be laid up to a certain distance, and since there is no material consumed separately except the sand 2, the sand 2 Compared with the conventional case of double waste) and water will be able to reduce the operating cost of the sand bag (20).

As described above, the soft sand laying machine using the pneumatic pressure according to the present invention is able to install a large amount of sand per unit time on the soft ground by using compressed air, so that the sand layer for reinforcing the soft ground is very fast. There is an effect that can be formed in time, and even if a separate reinforcement facility such as a high-strength mat is not installed, there is an effect that can be easily installed sand layer on super soft ground such as wetlands.

In addition, as soon as sand laying is completed, various improvement equipments can be introduced into the soft ground, and even in the case of ultra soft ground such as wetlands, the ground water is drained along with sand installation to improve the equipment within a relatively quick time. As it can be put in place, it is effective to shorten the overall construction period due to the improvement of the soft ground, and it is possible to simplify the operation and maintenance of the equipment by minimizing the sand laying equipment and simplifying its structure. There is an effect that can reduce the cost.

Claims (2)

A suction silencer 7 is connected to the suction pipe 4a side of the blower 4 connected to the drive motor 3 and the belt 5, and a safety valve is provided on the discharge tube side of the blower 4 made of a flexible joint 4b. 8a and the discharge silencer 8 are connected to each other, and the blower pipe 11 is connected to the distal end of the discharge silencer 8 with the check valve 9 and the stop valve 10 interposed therebetween. The sand transport pipe 12 is integrally installed with the blower pipe 11 at the front end of the blower pipe 11, An injection hopper 14 of sand 2 having a rotary valve 13 is installed inside the discharge port 14a communicating with the sand transport pipe 12 at an upper side of the sand transport pipe 12. The sand spray pipe 15 is integrally installed with the sand transport pipe 12 at the tip end of the sand transport pipe 12, Soft ground using pneumatic pressure, characterized in that 4 to 12 compressed air injection nozzles 16 are installed through the outer circumferential surface of the connecting portion 12a in the connection portion 12a of the sand transfer pipe 12 and the sand spray pipe 15. Dragon sanders. The sand spreader of claim 1, wherein the compressed air injection nozzle (16) is helically penetrated along the outer circumferential surface of the connecting portion (12a).