JP3146527U - Dump truck - Google Patents

Abstract

Provided is a dump truck that can efficiently transport concrete used in an extended layer construction method, and can be easily stacked above a predetermined height when discharging concrete.
A loading platform 16 is provided which has an opening 24 into which concrete S is poured upward, and a concrete receiving portion 18 having a discharge port 26 for discharging the concrete S on the rear side of a vehicle body 12. A tilting mechanism for tilting the loading platform 16 in the front-rear direction is provided. By tilting the loading platform 16, the concrete S in the concrete accommodating portion 18 is discharged from the discharge port 26 to the rear of the vehicle body 12. An inclined surface 18c having an upward inclination angle with respect to the ground is provided from the bottom of the concrete accommodating portion 18 to the discharge port 26, and the discharge port 26 is also inclined when the loading platform 16 is tilted to the maximum in order to discharge the concrete S. It is located at a position higher than the concrete placement height by the extended layer method.
[Selection] Figure 1

Description

  The present invention relates to a dump truck used for construction of a concrete dam, and more particularly to a dump truck used for transporting concrete for an extended layer method.

  As a construction method for constructing a concrete dam, a block construction method and a layer construction method which are types of columnar construction methods, an RCD construction method (Roller Compacted Concrete for Dam) which is a kind of a planar construction method, and an extended layer construction method (ELCM) are used. Are known. In recent years, the extended layer construction method that is suitable for the construction of small and medium-sized concrete dams and part of large-scale concrete dams and that can shorten the construction period and reduce the construction cost as compared with the prior art has been actively used.

  The extended layer construction method is a construction method in which a large range is placed at a time without providing seams as much as possible in the construction equipment and the like. The concrete used for the extended layer method is generally a slumped concrete. This concrete is manufactured at a concrete plant and transported to a construction site by a dump truck. When the concrete is lowered from the dump truck to the place where it is placed, it is leveled with a wheel loader or the like, and compacted by applying vibration with a compacting machine such as a buy back. Furthermore, the next placement is performed through joint cutting, curing, and placement surface treatment by a joint cutting machine. In this series of operations, multiple concrete blocks are stepped while being compacted with only an internal vibrator at the same time, so the internal concrete placement area is small, such as small-scale dams and medium-scale dams with many dam structures. Is advantageous in some cases.

Conventionally, as a dump truck used for construction of a concrete dam, for example, as disclosed in Patent Document 1, a container for transporting earth and sand for disposal is detachably provided on the loading platform, and the loading platform is inclined. There is a dump truck for transporting earth and sand that has a structure that prevents the container from sliding off the carrier even when it is left. The container includes a slope extending obliquely upward from the bottom plate toward one side of the opening, and is formed so that at least the slope is in contact with the bottom surface of the cargo bed when tilted.
JP 2005-81850 A

  However, the dump truck for earth and sand conveyance of Patent Document 1 is discharged from the bed because the side of the opening from which the earth and sand are discharged from the container is close to the ground when the bed is inclined to discharge the earth and sand. It was impossible to pile up earth and sand. Therefore, in order to pile up the earth and sand etc. beyond the concrete placement height set by the general extended layer method, it is necessary to provide a separate step of pile up the earth and sand, which is very troublesome.

  Moreover, when the concrete used for the extended layer construction method is transported by the dump truck for transporting earth and sand, the concrete in the container may flow out to the loading platform. Therefore, a large amount of concrete cannot be transported efficiently.

  The present invention has been made in view of the above-described background art, and can efficiently transport concrete used in the extended layer construction method, and can be easily stacked above a predetermined height when discharging concrete. Aims to provide a simple dump truck.

  The present invention includes a vehicle main body provided with a pair of left and right front wheels and a rear wheel, and a concrete housing portion having an opening into which concrete is poured upward, and a discharge port for discharging the concrete on the vehicle main body rear side. A dump truck provided with a loading platform provided and a tilting mechanism for tilting the loading platform in the front-rear direction, and by tilting the loading platform, the concrete in the concrete container is discharged from the discharge port to the rear of the vehicle body. The concrete is concrete used for construction of a concrete dam by an extended layer construction method, and an inclined surface having an upward inclination angle with respect to the ground is formed from the bottom of the concrete accommodating portion to the discharge port, The discharge port is also used when the loading platform is tilted to the maximum to discharge the concrete. A dump truck located at a position higher than the concrete 設高 of by the extended Reya method.

  Moreover, it is preferable that the rear part of the vehicle main body is located at a position higher than a half of the concrete placement height by the extended layer method.

  Further, the concrete accommodating portion may be an independent concrete container, and the loading platform may be a dump truck provided with an attachment mechanism for detachably fixing the concrete container.

  In the dump truck of the present invention, even when the loading platform is tilted, the concrete outlet provided in the loading platform is located at a position higher than the concrete placement height by the extended layer method, so that the concrete can be placed easily. It can be stacked more than the installation height.

  Moreover, the concrete used for the extended layer construction method can be efficiently transported in the shape of a concrete receiving portion having a simple structure.

  In addition, if the concrete container is configured so that the concrete container is detachably fixed to the loading platform, a dump truck for transporting concrete suitable for concrete dam construction by the extended layer method can be used at low cost using a general-purpose dump truck. Can be configured.

  Hereinafter, a dump truck 10 according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the dump truck 10 includes a vehicle main body 12 having a driver's seat 12a provided at the front portion and front wheels 12b and rear wheels 12c attached to the lower surface. A loading platform 16 is disposed on the upper surface of the rear portion of the vehicle main body 12, and is pivotally attached via a rotating shaft 14. The loading platform 16 includes a concrete accommodating portion 18 that accommodates the concrete S, a support portion 20 that supports the concrete accommodating portion 18 from below, and a tilting base 22 that has the support portion 20 attached to the upper surface. A tilting mechanism such as a hydraulic cylinder (not shown) provided in the vehicle main body 12 is connected to the lower surface of the tilting table 22, and the concrete accommodation unit 18, the support unit 20, and the tilting table 22 are integrated around the rotation shaft 14. Can be tilted.

  The concrete accommodating portion 18 includes a front wall 18b that rises relatively steeply from the bottom portion 18a toward the front, an inclined surface 18c that is formed at a relatively slanting angle obliquely upward from the bottom portion 18a to the rear, and a pair that rises substantially vertically. The side wall 18d is formed with an opening 24 into which the concrete S is poured, and a discharge port 26 through which the concrete S is discharged. The inclination angle of the inclined surface 18c is set so that the discharge port 26 is located at a position higher than the concrete placement height H described later even when the loading platform 16 is tilted.

Next, the function of the dump truck 10 at the construction site of the concrete dam using the extended layer method will be described. The concrete for placement is manufactured at a concrete plant installed at a predetermined place and transported to each construction site of a concrete dam by a dump truck or the like. Concrete S used in the extended layer method is slumped and is discharged from a discharge port provided below the storage tank of the concrete plant, and is poured into the concrete accommodating portion 18 of the dump truck 10 from above the opening 24. As shown in FIG. 1B, the concrete S is loaded in a range that does not exceed the lower edge portion 26 a of the discharge port 26 formed in the concrete accommodating portion 18. In this embodiment, the dump truck 10 is provided with a large concrete accommodating portion 18 capable of accommodating, for example, 6.0 m ³ of concrete, and a truck having a maximum loading weight equivalent to 20 t is used.

  The dump truck 10 on which the concrete S is loaded transports the concrete S to a placement site on the construction site. And as shown to Fig.2 (a), the loading platform 16 is tilted and the concrete S is discharged | emitted from the discharge port 26 of the back. In the extended layer construction method, it is preferable to set the single casting height H to about 1.5 m, and further, the working efficiency is good if the casting is divided into two layers each having a thickness of 0.75 m. Here, when the concrete S is discharged to the ground 28 for the first layer placement, a concrete pile is formed at a height of about 1 m due to the fluidity of the concrete S. At this time, the discharge port 26 of the dump truck 10 is at a height of about 2 m even when the loading platform 16 is tilted by setting the inclination angle of the inclined surface 18c, so the concrete S is discharged and the ground 28 is discharged. It is possible to stack up to a height of about 1 m without any problem.

  When the concrete S is lowered to the placement site, it is leveled by using a wheel loader (not shown) and the like, and as shown in FIG. 2 (b), it vibrates using the vibration portion 30a of the Viback 30 as a compacting machine. Give and compact. Considering the compaction ability of the general buyback 30, a placement height of 0.75 m is an appropriate thickness. Thereafter, joint cutting with a joint cutting machine, curing, and placement surface processing are performed, and the placement process for the first layer D1 is completed.

  Next, a second layer D2 having a thickness of 0.75 m is placed on the upper surface of the first layer D1. First, as with the first layer D1, the dump truck 10 transports the concrete S to the placement site, tilts the loading platform 16 and removes the concrete S from the rear outlet 26 as shown in FIG. Discharge. Here, in order to place the second layer D2, the concrete S is stacked to a height of about 1 m from the upper surface of the first layer D1, that is, to a height of about 1.75 m from the ground 28. The discharge port 26 of the dump truck 10 is at a height of about 2 m even when the loading platform 16 is tilted by setting the inclination angle of the inclined surface 18 c, so that the concrete S is about 1.75 m high from the ground 28. There is no problem even if they are stacked.

  The rear portion 12d of the rear wheel 12c of the vehicle body 12 of the dump truck 10 is set to about 0.8 m from the ground and does not interfere with the first layer D1 having a thickness of 0.75 m. The rear wheel 12c can be retracted until just before riding on the first layer D1. Further, since the discharge port 26 is separated from the rotation shaft 14 by a predetermined distance, when the loading platform 16 is tilted about the rotation shaft 14, the discharge port 26 largely moves backward from the position of the rear wheel 26. Therefore, the concrete S can be piled up in a wide range from the tip of the upper surface of the first layer D1 to the back.

  When the concrete S is lowered to the place where it is placed, as with the first layer, it is leveled supplementarily using a wheel loader (not shown), and as shown in FIG. Vibration is applied using the vibration portion 30a and compaction is performed. Thereafter, joint cutting, curing, and placement surface processing are performed by a joint cutting machine, and the placement process for the second layer D2 is completed.

  When the placement area is further expanded, the placement of the first and second layers is repeatedly performed on the side of the first layer D1 (on the left side of the first layer D1 in FIG. 3B).

  Note that the inclination angle of the inclined surface 18c of the concrete accommodating portion 18 is appropriately adjusted in consideration of the fluidity of the concrete S and the like. For example, when placing concrete S having relatively high fluidity, when the loading platform 16 is tilted, if the inclined surface 18c is slightly inclined downward, the concrete S easily flows out. The inclination angle of the inclined surface 18c when horizontal may be set relatively steep. On the other hand, when placing the concrete S having relatively low fluidity, when the loading platform 16 is tilted, the concrete S does not flow out unless the inclined surface 18c is directed rearward and a large downward slope is formed. It is preferable that the inclination angle of the inclined surface 18c at the time is set relatively gently.

  As explained above, in the extended layer construction method, considering the setting of the height of the rear wheel rear portion of a general dump truck body and the compaction capacity of a general compacting machine, concrete can be performed once. When the casting height H is set to about 1.5 m and the casting is divided into two layers each having a thickness of 0.75 m and the casting area is expanded by repeating this, the working efficiency is good. And the dump truck 10 which is one Embodiment of this invention is equipped with the form of the loading platform 16 optimal for the said construction method. That is, even when the loading platform 16 is tilted, the concrete outlet 18 is located at a position higher than the concrete placement height H, so that the concrete is easily piled up to a height exceeding the placement height H. Can do.

  Note that the dump truck of the present invention is not limited to the above embodiment, and when the concrete accommodating portion 18 has a sufficient length in the front-rear direction, a horizontal bottom surface portion is provided on the bottom portion 18a. Also good. Further, a top plate or the like covering the opening 24 may be added so that rainwater or the like does not enter the concrete accommodating portion 18. Moreover, you may add the opening / closing member etc. which block | close the discharge port 26 so that the concrete S may not flow out from the discharge port 26 during conveyance.

  Further, the concrete accommodating portion may be an independent concrete container, and the loading platform may be a dump truck provided with an attachment mechanism for detachably fixing the concrete container. For example, a general-purpose dump truck is provided with a loading platform consisting of a horizontal, substantially rectangular bottom surface and four side walls erected on each side of the bottom surface. This loading platform structure is used for transporting concrete. It is not suitable. However, by attaching the above-described concrete container to the loading platform in a detachable manner, a dump truck for transporting concrete suitable for concrete dam construction by the extended layer method can be easily configured using a general-purpose dump truck. Therefore, it is not necessary to purchase a dedicated expensive dump truck.

It is the top view (a) and front view (b) which show one embodiment of the dump truck of this device. It is a front view (a) which shows a mode that the 1st layer concrete is discharged | emitted from the dump truck of this embodiment, and a front view (b) which shows the mode of the 1st layer compaction process. It is a front view (a) which shows a mode that the 2nd layer concrete is discharged | emitted from the dump truck of this embodiment, and a front view (b) which shows the mode of the 2nd layer compaction process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Dump truck 12 Vehicle main body 12c Rear wheel 12d Back part 14 Rotating shaft 16 Loading platform 18 Concrete accommodating part 18a Bottom part 18c Inclined surface 24 Opening part 26 Outlet D1 Placing 1st layer D2 Placing 2nd layer S Concrete

Claims (3)

A cargo bed having a vehicle body provided with a pair of left and right front wheels and a rear wheel, and a concrete receiving portion having an opening into which concrete is poured upward, and a discharge port for discharging the concrete on the vehicle body rear side. And a tilting mechanism that tilts the loading platform in the front-rear direction, and by tilting the loading platform, the dump truck for discharging the concrete in the concrete accommodating portion from the discharge port to the rear of the vehicle body,
An inclined surface having an upward inclination angle with respect to the ground is formed from the bottom of the concrete accommodating portion to the discharge port, and the discharge port is also tilted to the maximum to discharge the concrete. The dump truck is located at a position higher than the concrete placement height by the extended layer method.   2. The dump truck according to claim 1, wherein a portion of the vehicle main body rearward of the rear wheel is located at a position higher than a half of a concrete placement height by an extended layer method. 2. The dump truck according to claim 1, wherein the concrete accommodating portion is made of an independent concrete container, and the loading platform includes an attachment mechanism for detachably fixing the concrete container.

Images