Shooter and backfilling method

Abstract

To efficiently charge a backfilling material loaded on a load-carrying platform of a dump truck into a backfilling area.SOLUTION: A chute 1 guides a backfill material M discharged from an opening part of a tail gate side 12a of a load-carrying platform 12 into a backfill area R by dumping up the load-carrying platform 12 of a dump truck 11 loaded with the backfill material M. A chute 1 is provided with a flexible bag body 2 suspended and supported on the outside of a deck 12. The flexible bag body 2 has an inflow port for allowing the backfill material M to flow into the bag in an upper part, and an outflow port 4 for allowing the backfill material M passing through the bag to flow out of the bag in a lower part.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a chute and a backfilling method. [Background technology]

[0002] When laying various types of pipes underground, such as power transmission pipelines, gas pipes, and water pipes, it is necessary to lay the pipes in a backfill area (trench) formed by excavation, and then backfill the backfill area with backfill material such as soil.

[0003] In this type of backfilling work, it is common to use a dump truck or a backhoe to directly dump the backfilling material into the backfilling area (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-107341 Summary of the Invention [Problem to be solved by the invention]

[0005] When dumping backfill material using a dump truck, for example, the backfill material discharged from the tailgate opening when the truck is dumped is dumped directly into the backfilling area. In this case, the discharged backfill material scatters over a wide area, causing a large amount of backfill material to leak onto the ground surface outside the backfilling area. This requires work to drop the leaked backfill material into the backfilling area, which results in a problem of poor work efficiency.

[0006] On the other hand, when using a backhoe to deposit backfill material, for example, the backhoe is used to scoop up the backfill material from the bed of a dump truck carrying the material and deposit it directly into the backfill area. This requires the use of a dump truck and a backhoe for the backfilling work, which reduces work efficiency.

[0007] An object of the present invention is to efficiently pour backfill material loaded on the bed of a dump truck into a backfilling area. [Means for solving the problem]

[0008] (1) The present invention, which was invented to solve the above problems, is a chute that guides backfill material discharged from the opening of the discharge gate of the loading platform into a backfilling area when the loading platform of a dump truck is dumped up, and is characterized in that it has a flexible bag body that is suspended and supported on the outside of the loading platform, and the flexible bag body has an inlet at the top through which the backfill material flows into the bag and an outlet at the bottom through which the backfill material that has passed through the bag flows out of the bag.

[0009] In this way, since the flexible bag is flexible, it is easy to align the outlet of the flexible bag with the backfilling area. Therefore, the backfilling material discharged from the opening of the discharge gate flows into the bag through the inlet of the flexible bag, and the backfilling material that has passed through the bag flows out of the bag through the outlet of the flexible bag, thereby allowing the backfilling material to be efficiently introduced into the backfilling area.

[0010] (2) In the configuration of (1) above, it is preferable that the opening area of ​​the outlet is smaller than the opening area of ​​the inlet.

[0011] This allows the backfilling material to be more reliably poured into the backfilling area.

[0012] (3) In the above-mentioned configuration (2), it is preferable that the flexible bag has a decreasing portion between the inlet and the outlet, in which the opening area gradually decreases from top to bottom.

[0013] In this way, the reducing portion allows the backfill material that has flowed into the bag from the inlet of the flexible bag body to move smoothly to the outlet of the flexible bag body.

[0014] (4) In any of the configurations (1) to (3) above, it is preferable that the flexible bag body has a cover portion that extends upward from the inlet and covers at least a portion of the outer surface of each of the discharge gate and the side gates on both sides of the loading platform.

[0015] In this way, the cover portion of the flexible bag can more reliably prevent the backfill material discharged from the opening of the discharge gate from scattering around.

[0016] (5) In any of the above configurations (1) to (4), it is preferable that the flexible bag has an insertion portion that is inserted into the backfilled area, and that the insertion portion is provided with an outlet.

[0017] In this way, the insertion portion of the flexible bag can more reliably inject the backfill material into the backfilling area. Furthermore, because the insertion portion of the flexible bag is flexible, even if it comes into contact with an obstacle in the backfilling area, it bends to avoid the obstacle, allowing the injection of backfill material to continue.

[0018] (6) In any of the above configurations (1) to (5), the flexible bag body is preferably made of resin.

[0019] This has the advantage of improving durability compared to when the flexible bag is made of natural materials such as hemp.

[0020] (7) The present invention, which was invented to solve the above problems, is a backfilling method, characterized in that backfilling material is poured into the backfilling area using a dump truck equipped with a chute having any of the configurations (1) to (6) above.

[0021] In this way, the same effects as those of the corresponding configurations already described can be obtained. [Effects of the Invention]

[0022] According to the present invention, backfilling material loaded on the bed of a dump truck can be efficiently dumped into the backfilling area. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 2 is a perspective view of the chute according to the present embodiment. [Figure 2] 1 is a perspective view showing the area around the tailgate of a dump truck to which a chute according to an embodiment of the present invention is attached. [Figure 3] 1A to 1C are diagrams illustrating the first step included in the backfilling method according to the present embodiment, and are diagrams for explaining the procedure for backfilling the area around the pipes in the backfilling area. [Figure 4] 10(a) and 10(b) are diagrams illustrating the second step included in the backfilling method according to the present embodiment, and are diagrams for explaining the procedure for backfilling the upper part of the pipe in the backfilling region. DETAILED DESCRIPTION OF THE INVENTION

[0024] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings, direction a is defined as "front," direction b is defined as "rear," direction c is defined as "width," direction d is defined as "top," and direction e is defined as "bottom."

[0025] As shown in Figures 1 and 2, the chute 1 according to this embodiment guides backfill material M, such as earth and sand, discharged from an opening in a tailgate 12a (discharge gate) when the bed 12 of a dump truck 11 loaded with the backfill material M is dumped up, into a backfilling area R. In this embodiment, the dump truck 11 is a rear dump truck with a bed 12 tilted rearward, and the tailgate 12a is of a downward-opening type. That is, the tailgate 12a is supported by a hinge on the upper side so that it can swing, and an opening is formed below the tailgate 12a when the bed 12 is dumped up. The backfilling area R is a trench-like shape formed by excavation using a backhoe or the like (not shown).

[0026] The chute 1 includes a flexible bag body 2 that is suspended and supported on the outside of the loading platform 12 of a dump truck 11. The flexible bag body 2 has an inlet 3 at the top, as indicated by the arrow x in FIG. 1, through which backfill material M flows into the bag, and an outlet 4 at the bottom, as indicated by the arrow y in FIG. 1, through which the backfill material M that has passed through the bag flows out of the bag. Note that in FIG. 1, the parts corresponding to the inlet 3 and the outlet 4 are cross-hatched. The flexible bag body 2 may be slightly deformed, bulging outward, due to the weight of the backfill material M passing through the bag.

[0027] The opening area of ​​the outlet 4 is smaller than the opening area of ​​the inlet 3. When the opening area of ​​the inlet 3 is A1 and the opening area of ​​the outlet 4 is A2, A2 / A1 is preferably 0.217 to 0.556.

[0028] In this embodiment, the inlet 3 and the outlet 4 are rectangular and elongated in the width direction. The width dimension of the outlet 4 is smaller than the width dimension of the inlet 3, and the front-to-rear dimension of the outlet 4 is the same as the front-to-rear dimension of the inlet 3. In this embodiment, the front-to-rear dimension of the entire flexible bag 2 is constant.

[0029] The width L1 of the inlet 3 is preferably 1800 to 2300 mm. The width L2 of the outlet 4 is preferably 500 to 1000 mm. The front-to-rear dimensions L3, L4 of the inlet 3 and outlet 4 are preferably 300 to 500 mm. The shapes (opening area, dimensions, etc.) of the inlet 3 and outlet 4 can be changed as appropriate depending on the dump truck 11 to which they are attached and the size of the backfilling area R where the backfilling work is to be performed.

[0030] The flexible bag 2 has a reducing section 5 between the inlet 3 and the outlet 4, whose opening area gradually decreases from top to bottom. In this embodiment, the inlet 3 is provided at the upper end of the reducing section 5. The reducing section 5 has a front surface 5a located on the front side, a rear surface 5b located on the rear side, and side surfaces 5c located on both ends in the width direction.

[0031] The front surface 5a and rear surface 5b of the tapered portion 5 have the same shape, and the width dimension gradually decreases from top to bottom. That is, the width dimension of the lower end of each of the front surface 5a and rear surface 5b of the tapered portion 5 is smaller than the width dimension of the upper end. In this embodiment, the front surface 5a and rear surface 5b of the tapered portion 5 have an inverted isosceles trapezoid shape.

[0032] Both side surfaces 5c of the reducing portion 5 have the same shape and a constant front-to-back dimension. Both side surfaces 5c of the reducing portion 5 are formed as inclined surfaces that gradually approach each other from top to bottom. In this embodiment, both side surfaces 5c of the reducing portion 5 are rectangular.

[0033] The vertical dimension L5 of the reduced portion 5 is preferably 500 mm to 800 mm. The width dimension L6 of the upper end of the front portion 5a and the rear portion 5b of the reduced portion 5 is preferably 1800 mm to 2300 mm. The width dimension L7 of the lower end of the front portion 5a and the rear portion 5b of the reduced portion 5 is preferably 500 mm to 1000 mm. The front-to-rear dimension L8 of the side portion 5c of the reduced portion 5 is preferably 300 mm to 500 mm. The inclination angle θ of the side portion 5c of the reduced portion 5 with respect to the vertical direction is preferably 26° to 61°. The shape of the reduced portion 5 (opening area, dimensions, etc.) can be changed as appropriate depending on the dump truck 11 to which it is attached and the size of the backfilling area R where backfilling work is performed.

[0034] The flexible bag body 2 has an insertion portion 6 that is inserted into the backfilling region R. In this embodiment, the insertion portion 6 is inserted into the backfilling region R below the ground contact area of ​​the tires of the dump vehicle 11. However, if the backfilling region R is provided on a slope (if the ground surface G in FIG. 3 is a slope), the insertion portion 6 may be inserted into the backfilling region R above the ground contact area of ​​the tires of the dump vehicle 11. The lower end of the reduction portion 5 is connected to the upper end of the insertion portion 6, and an outlet 4 is provided at the lower end of the insertion portion 6. The insertion portion 6 has a front surface portion 6a located on the front side, a rear surface portion 6b located on the rear side, and side surface portions 6c located on both widthwise ends.

[0035] The front surface 6a and rear surface 6b of the insertion portion 6 are identically rectangular and have a constant width.

[0036] Both side surface portions 6c of the insertion portion 6 are identically rectangular, and the front-to-rear dimension is constant.

[0037] The vertical dimension L9 of the insertion portion 6 is preferably 600 mm to 1200 mm. The width dimension L10 of the front portion 6a and the rear portion 6b of the insertion portion 6 is preferably 500 mm to 1000 mm. The front-to-rear dimension L11 of the side portion 6c of the insertion portion 6 is preferably 300 mm to 500 mm. The shape (opening area, dimensions, etc.) of the insertion portion 6 can be changed as appropriate depending on the dump truck 11 to which it is attached and the size of the backfilling area R where backfilling work is performed. The vertical dimension of the insertion portion 6 can be adjusted not only by replacing the flexible bag body 2, but also by folding or cutting the lower end portion of the insertion portion 6.

[0038] The flexible bag body 2 has a cover portion 7 that extends upward from the inlet 3 and covers at least a portion of the outer surfaces of the tailgate 12a and both side flap panels 12b. Specifically, the cover portion 7 has a rectangular tail cover portion 7b that abuts or is close to the lower outer surface of the tailgate 12a, and a rectangular side cover portion 7c that abuts or is close to the lower outer surface of the rear end of each side flap panel 12b. The rear end of the side cover portion 7c is continuous with the widthwise end of the tail cover portion 7b. A position corresponding to the upper front side of the inlet 3 (the front surface portion 5a of the reduction portion 5) is a cutout portion without a cover portion 7.

[0039] The flexible bag 2 may be made of a natural material such as hemp, but is preferably made of resin. Examples of resin that can be used include synthetic fibers such as polyethylene and polypropylene. When using a flexible bag 2 made of resin, it is preferable to add an ultraviolet light inhibitor to the resin.

[0040] The flexible bag 2 has handles 8 for suspending and supporting the flexible bag 2 on the outside of the loading platform 12. The handles 8 include a first upper handle 8a provided at the center of the width of the outer surface of the tail cover portion 7b, a second upper handle 8b provided on the front side of the outer surfaces of both side cover portions 7c, and a third side handle 8c provided on the front side of the outer surfaces of both side portions 5c of the tapered portion 5. Each handle 8 is formed, for example, by a ring-shaped band. As shown in FIG. 2 , the first handle 8a is fixed to the upper end of the tailgate 12a or the like via a hook 13. The second handle 8b is fixed to the upper end of the side gate 12b or the like via a hook (not shown). The third handle 8c is fixed to the lower end of the side gate 12b or the like via a lashing belt 14. By fastening the handles 8 to the dump truck 11 in this manner, the flexible bag 2 is suspended and supported on the outside of the loading platform 12. The fixing method and fixing position of each handle 8 can be changed as appropriate.

[0041] Next, a backfilling method according to this embodiment will be described. This method is carried out using a dump truck 11 equipped with the chute 1 (flexible bag body 2).

[0042] This method includes a first step S1 of backfilling the area around the pipe P in the backfilled area R as shown in FIGS. 3(a) to 3(c), and a second step S2 of backfilling the area above the pipe P in the backfilled area R as shown in FIGS. 4(a) to 4(b). The pipe P is, for example, a power transmission pipeline, a gas pipe, or a water pipe. The pipe P extends along the longitudinal direction (front-to-back direction) of the backfilled area R. A plurality of pipes P may be arranged in parallel.

[0043] As shown in Fig. 2, the first step S1 is performed in a state where retaining plates (sheet piles) B and struts S for fixing the retaining plates B are placed in the backfill area R. Note that the retaining plates B and struts S are not shown in the drawings other than Fig. 2.

[0044] In the first step S1, first, as shown in FIG. 3(a), the chute 1 attached to the dump truck 11 is aligned to a predetermined position within the backfilling area R. Specifically, the insertion portion 6 of the flexible bag body 2 of the chute 1 is inserted into the backfilling area R at the front end of the backfilling area R. At this time, the height of the lower end of the insertion portion 6 is adjusted to be higher than the piping P. Furthermore, in order to prevent the backfilling area R from collapsing, the dump truck 11 is positioned so as not to straddle the backfilling area R (forward of the front end of the backfilling area R).

[0045] In this state, the loading platform 12 is dumped up, and the backfilling material M is discharged from the opening of the tailgate 12a, and the discharged backfilling material M is thrown into the backfilling region R by the flexible bag body 2.

[0046] Next, as shown in FIG. 3(b), when the backfill material M reaches above the piping P at the front end of the backfilling area R, the loading platform 12 is lowered to stop the introduction of the backfilling material M. Between the start and end of the introduction of the backfilling material M, the dump truck 11 may be backed up with the loading platform 12 in the dumped-up state in order to adjust the introduction position of the backfilling material M (the top position of the pile of backfilling material M piled up in the backfilling area R). Once a certain amount of backfilling material M has been introduced into the backfilling area R, even if the dump truck 11 is backed up and straddles the backfilling area R, the backfilling area R can be prevented from collapsing due to the weight of the dump truck 11.

[0047] Thereafter, as shown in Figure 3(c), the dump truck 11 is backed up a predetermined distance while straddling the backfilling area R. Then, by dumping up the loading platform 12 again at that position, the backfilling material M is supplied up to above the piping P through the flexible bag body 2. Thereafter, the backing up of the dump truck 11 and the dumping up of the loading platform 12 are repeated in the same procedure, and the backfilling material M is supplied throughout the backfilling area R up to above the piping P.

[0048] In this method, after the first step S1 is completed and before the second step S2 is started, the retaining plate B and the strut S are removed from within the backfilled area R.

[0049] In the second step S2, first, as shown in FIG. 4(a), the insertion portion 6 of the flexible bag body 2 of the chute 1 is positioned above the piping P in the backfilling area R at the rear end of the backfilling area R. At this time, the dump truck 11 is positioned in front of the rear end of the backfilling area R, straddling the backfilling area R. Then, at this position, the loading platform 12 is dumped up, and the backfilling material M is again poured into the backfilling area R using the flexible bag body 2. Thereafter, as shown in FIG. 4(b), the dump truck 11 is moved forward with the loading platform 12 dumped up, and the pouring position of the backfilling material M is sequentially changed. In this way, the backfilling material M is poured throughout the backfilling area R up to the vicinity of the ground surface G.

[0050] In this method, after the second step S2 is completed, the surface of the backfill material M is compacted by a compaction machine such as a rammer. If necessary, the surface of the compacted backfill material M is paved with asphalt or the like.

[0051] According to the chute 1 and the backfilling method using the same described above, the flexibility of the flexible bag 2 can be utilized to easily align the outlet 4 of the flexible bag 2 with the backfilling area R. Therefore, the backfilling material M discharged from the opening of the tailgate 12a flows into the bag through the inlet 3 of the flexible bag 2, and the backfilling material M that has passed through the bag flows out of the bag through the outlet 4 of the flexible bag 2, thereby efficiently introducing the backfilling material M into the backfilling area R. In other words, the backfilling material M is less likely to leak onto the ground surface G outside the backfilling area R. As a result, the construction period for the backfilling work can be shortened. This effect is more pronounced when the flexible bag 2 has the reducing portion 5 and / or the inserting portion 6.

[0052] Furthermore, since the flexible bag body 2 is provided with the cover portion 7, the backfill material M discharged from the opening of the tailgate 12a can be more reliably prevented from scattering around.

[0053] Furthermore, since the insertion portion 6 of the flexible bag body 2 is flexible, even if it comes into contact with an obstacle such as a strut S in the backfill area R, it deforms to avoid the obstacle, which has the advantage that the backfill material M can continue to be poured.

[0054] The present invention is not limited to the configuration of the above-described embodiment, nor is it limited to the above-described effects. The present invention can be modified in various ways without departing from the spirit of the present invention.

[0055] In the above embodiment, the case where the inlet 3 is provided at the upper end of the reduction section 5 has been described, but the reduction section 5 may also be provided at a position away from the inlet 3 downward. However, from the viewpoint of efficiently supplying the backfilling material M into the backfilling region R, it is preferable that the reduction section 5 be provided above the insertion section 6 (outside the backfilling region R).

[0056] In the above embodiment, the flexible bag 2 does not have to have the insertion portion 6 to be inserted into the backfilling area R. In other words, the flexible bag 2 may be configured to inject the backfilling material M into the backfilling area R from near the ground surface G outside the backfilling area R (directly above the backfilling area R). However, from the viewpoint of reliably preventing the backfilling material M from leaking to the ground surface G, it is preferable to provide the insertion portion 6.

[0057] In the above embodiment, the cross-sectional shape of the flow path within the bag of the flexible bag 2 through which the backfill material M passes is rectangular, but is not limited to this. The cross-sectional shape of the flow path within the bag of the flexible bag 2 may be a perfect circle, an ellipse, an oval, or the like. Furthermore, the cross-sectional shape of the flow path within the bag of the flexible bag 2 may include different shapes, such as a rectangular shape at the upper part of the bag and a circular shape at the lower part of the bag.

[0058] In the above embodiment, the chute 1 (flexible bag body 2) is attached to a position corresponding to the tailgate 12a (a discharge gate provided at the rear of the loading platform) of the rear dump vehicle 11, but the present invention is not limited to this. For example, the present invention can also be applied to a side dump vehicle whose loading platform tilts to the left or right (one side in the width direction). In this case, the chute 1 (flexible bag body 2) is attached to a position corresponding to the side gate (a discharge gate provided on one side in the width direction of the loading platform) of the side dump vehicle.

[0059] In the above embodiment, when the chute 1 (flexible bag body 2) is not in use, it may be removed from the dump truck 11 and folded up for storage. [Explanation of symbols]

[0060] 1 Shooter 2 Flexible bag 3 Inlet 4 Outlet 5 Decreasing part 6 Insertion section 7 Cover 8 Handle 11 Dump truck 12 Cargo bed 12a Tailgate M Backfill material R Backfill area S1 First process S2 Second process

Claims

1. A chute that guides the backfill material discharged from an opening of a discharge gate of the loading platform into a backfilling area when a loading platform of a dump truck loaded with backfill material is dumped up, a flexible bag body suspended and supported on the outside of the loading platform; The flexible bag body has an inlet at the top through which the backfill material flows into the bag, and an outlet at the bottom through which the backfill material that has passed through the bag flows out of the bag.

2. 2. The chute according to claim 1, wherein the opening area of ​​the outlet is smaller than the opening area of ​​the inlet.

3. 3. The chute according to claim 2, wherein the flexible bag has a tapered portion between the inlet and the outlet, the opening area of ​​which gradually decreases from top to bottom.

4. 3. The chute according to claim 1, wherein the flexible bag body has a cover portion that extends upward from the inlet and covers at least a portion of the outer surfaces of the discharge gate and the side gates on both sides of the loading platform.

5. the flexible bag has an insert portion that is inserted into the backfilled area; The chute according to claim 1 or 2, wherein the outlet is provided in the insertion portion.

6. 3. The chute according to claim 1, wherein the flexible bag is made of resin.

7. A backfilling method, comprising the steps of: using a dump truck equipped with the chute according to claim 1 or 2 to dump backfilling material into a backfilling area.

Images