JP4841381B2 - Transportation vehicle and asphalt mixture transportation method - Google Patents

Transportation vehicle and asphalt mixture transportation method Download PDF

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JP4841381B2
JP4841381B2 JP2006270848A JP2006270848A JP4841381B2 JP 4841381 B2 JP4841381 B2 JP 4841381B2 JP 2006270848 A JP2006270848 A JP 2006270848A JP 2006270848 A JP2006270848 A JP 2006270848A JP 4841381 B2 JP4841381 B2 JP 4841381B2
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sheet
heat
cargo bed
asphalt mixture
loading platform
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JP2008088698A (en
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雅章 石川
志伸 佐竹
弘 山口
国雄 松永
厚 源
忍 上河
良自 森元
康宏 奥田
徹也 桑島
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Tokyo Gas Co Ltd
Toyobo Co Ltd
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Tokyo Gas Co Ltd
Toyobo Co Ltd
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Description

本発明は、荷台にアスファルト混合物を積載して運搬する運搬用車両及びアスファルト混合物運搬方法に関する。   The present invention relates to a transport vehicle that transports an asphalt mixture on a loading platform and a method for transporting the asphalt mixture.

道路のアスファルト舗装を行うときに用いられるアスファルト混合物は、アスファルトプラントで製造され、高温状態でダンプカーの荷台上にシュートから落下して積み込まれて工事現場に運搬されるが、運搬過程でアスファルト混合物の温度が低下すると、良質なアスファルト舗装ができなくなる。   The asphalt mixture used for road asphalt pavement is manufactured at an asphalt plant, dropped from a chute onto a dump truck bed at high temperature, and then transported to the construction site. When the temperature drops, good quality asphalt pavement cannot be achieved.

そこで、アスファルト混合物を工事現場に運搬するときには、荷台上に積み込まれたアスファルト混合物の表面にシートを被せて保温したり、特許文献1に記載されているように、断熱性材料で形成された荷台にアスファルト混合物を積み込んで運搬する方法等が知られている。   Therefore, when transporting the asphalt mixture to the construction site, a sheet is placed on the surface of the asphalt mixture loaded on the loading platform to keep it warm, or as described in Patent Document 1, a loading platform formed of a heat insulating material is used. A method of loading and transporting an asphalt mixture in a container is known.

特開2003−336210号公報JP 2003-336210 A

従来のアスファルト混合物の表面にシートを被せる方法では、図1(a)(側面説明図)及び図1(b)(背面説明図)に示すように、金属材料の熱伝導率が高い材料で形成された荷台10に、直接にアスファルト混合物Aを積載し、このアスファルト混合物Aの表面を単にシート80で覆っているだけなので、荷台10の床板11から放熱してアスファルト混合物Aの温度が低下するのは避けられない。またシート80の表面から放熱し、また車両走行時の風がシート表面に当たって放熱を促進し、更には車両走行時の風がシート内側に侵入してアスファルト混合物を冷却する。このため、アスファルト混合物Aの表面をシート80で覆っても効果的に温度低下を抑えることができないという問題が発生する。   In the conventional method of covering the surface of the asphalt mixture, as shown in FIG. 1A (side explanatory view) and FIG. 1B (rear side explanatory view), the metal material is formed of a material having high thermal conductivity. Since the asphalt mixture A is directly loaded on the loaded platform 10 and the surface of the asphalt mixture A is simply covered with the sheet 80, heat is released from the floor plate 11 of the platform 10 and the temperature of the asphalt mixture A decreases. Is inevitable. Further, heat is dissipated from the surface of the seat 80, and wind when the vehicle travels hits the surface of the seat to promote heat dissipation, and further, wind when the vehicle travels enters the seat to cool the asphalt mixture. For this reason, even if the surface of the asphalt mixture A is covered with the sheet 80, there arises a problem that the temperature drop cannot be effectively suppressed.

これによって、工事現場に運搬されたアスファルト混合物Aは、表面部分と荷台10に接している部分の温度が低下することになり、これらの温度低下した部分を取り除いたうえでアスファルト工事に使用されている。これにより、復旧面積に対して2〜3割増のアスファルト混合物Aを準備する必要があり、無駄が多く、温度低下した部分は作業廃棄物になり、環境問題の原因にもなる。また荷台10にアスファルト混合物Aを積載して運搬可能な運搬時間は、その温度低下を考慮すると、冬季や寒冷地では、約1〜2時間が限度であり、長時間の運搬は困難となる。   As a result, the temperature of the asphalt mixture A transported to the construction site is lowered in the temperature of the surface portion and the portion in contact with the loading platform 10, and is used for asphalt construction after removing these temperature-decreased portions. Yes. As a result, it is necessary to prepare an asphalt mixture A that is 20 to 30% more than the restoration area, and there is a lot of waste, and the portion where the temperature is lowered becomes working waste, which also causes environmental problems. Further, the transport time that can be transported by loading the asphalt mixture A on the loading platform 10 is limited to about 1 to 2 hours in winter and cold regions in consideration of the temperature drop, and long-time transport becomes difficult.

一方、断熱性材料製の荷台は、アスファルト混合物を運搬する専用車両となり、汎用性が低く、設備コストが大きいという問題があって、ほとんど普及していないのが現状である。   On the other hand, a carrier made of a heat insulating material becomes a dedicated vehicle for transporting an asphalt mixture, has a problem of low versatility and high equipment cost, and is not widely used at present.

本発明は、このような問題を解決するためになされたものであり、簡易な設備の追加でアスファルト混合物の温度低下を効果的に抑制することができ、長時間の運搬が可能であり、汎用性があり、経済面・環境面で良好な運搬用車両及びアスファルト混合物運搬方法を提供することを目的とする。   The present invention has been made to solve such a problem, and it is possible to effectively suppress the temperature drop of the asphalt mixture with the addition of a simple facility, and it can be transported for a long time. The purpose of the present invention is to provide a transportation vehicle and an asphalt mixture transportation method that are both economical and environmentally friendly.

このような課題を解決するために、本発明は、以下の特徴を有する。先ず、特徴の1つは、走行可能な車体と、該車体に対して傾動可能な荷台とを備え、該荷台にアスファルト混合物を積載して運搬可能な運搬用車両であって、前記荷台の外側下部を少なくとも前方及び側方に亘って覆う保温用シートを備え、前記荷台の床板の裏面下に前記保温用シートで覆われた空気滞留層を形成し、前記保温用シートは、前記荷台の外側下部を覆う底面部と該底面部の左右両側に繋がって延び前記荷台の左右両側方を覆う一対の側面部とを有することを特徴とする。 In order to solve such a problem, the present invention has the following features. First, one of the features is a transport vehicle that includes a vehicle body that can travel and a cargo bed that can tilt with respect to the vehicle body, and that can be transported by loading an asphalt mixture on the cargo bed. comprising a thermal insulation sheet covering over at least the front and side of the bottom to form an air retention layer above covered with thermal insulation sheet on the back surface of a said cargo bed floor, the insulation sheet is outside the loading platform It has a bottom part which covers a lower part, and a pair of side parts which are connected to both the left and right sides of the bottom part and cover both the left and right sides of the cargo bed .

この特徴によれば、荷台の外側下部を少なくとも前方及び側方に亘って覆う保温用シートを設けて、荷台の床板の裏面下に保温用シートで覆われた空気滞留層を形成することにより、荷台の床板の下方に断熱層を設けることができる。このため、床板からのアスファルト混合物の放熱を抑えることができ、アスファルト混合物の冷却防止効果を向上することができる。従って、アスファルト混合物の温度低下による品質劣化を最小限に抑えることができ、品質劣化して作業廃棄物となるアスファルト混合物の量が少なくなって無駄をなくして環境問題においても良好となり、長時間の運搬ができ、特に寒冷地等の運搬に効果をより発揮することができる。また本発明は、運搬用車両の荷台の下部に保温用シートを装着するだけであるので、土砂等を運搬するときにこれが邪魔にならなければ、保温用シートをそのままの状態にしておいてもよいので、保温用シートが存在しても、運搬用車両の運搬対象物が限定されるものではなく、アスファルト混合物以外の土砂等の運搬も可能であり、運搬用車両の汎用性を狭くすることもない。さらに本発明は、既存の運搬用車両の荷台に保温用シートを設けるだけであるので、コストの増加が抑制されて極めて経済的である。   According to this feature, by providing a heat retaining sheet that covers at least the front and sides of the outer lower portion of the cargo bed, by forming an air retention layer covered with the heat retaining sheet under the back surface of the floor plate of the cargo bed, A heat insulating layer can be provided below the floor plate of the loading platform. For this reason, the heat dissipation of the asphalt mixture from the floor board can be suppressed, and the cooling prevention effect of the asphalt mixture can be improved. Therefore, quality degradation due to the temperature drop of the asphalt mixture can be minimized, the amount of asphalt mixture that becomes quality waste due to quality degradation is reduced, waste is eliminated, environmental problems are also improved, and long-term It can be transported, and can be more effective especially in transport in cold regions. In addition, since the present invention only attaches a heat insulation sheet to the lower part of the loading platform of the transport vehicle, if this does not get in the way when transporting earth and sand, the heat insulation sheet may be left as it is. Even if there is a heat insulation sheet, the objects to be transported are not limited, and it is also possible to transport earth and sand other than the asphalt mixture, thereby narrowing the versatility of the transporting vehicle. Nor. Furthermore, the present invention is extremely economical because the increase in cost is suppressed because only the heat retaining sheet is provided on the loading platform of the existing transport vehicle.

また特徴の1つは、空気滞留層が、荷台の左右両側に設けられた一対の側板の床板より下方へ延びる下方延長部間に形成されることを特徴とする。   One of the characteristics is that the air retention layer is formed between lower extensions extending downward from the floor plates of the pair of side plates provided on the left and right sides of the loading platform.

この特徴によれば、空気滞留層は一対の側板の下方延長部間に形成されることより、空気滞留層の左右両側は一対の側板の下方延長部によって仕切られる。このため、空気滞留層の容積変動を小さくすることができ、空気滞留層の断熱性能を高い状態に維持することができる。   According to this feature, since the air retention layer is formed between the lower extensions of the pair of side plates, the left and right sides of the air retention layer are partitioned by the lower extensions of the pair of side plates. For this reason, the volume fluctuation | variation of an air retention layer can be made small and the heat insulation performance of an air retention layer can be maintained in a high state.

また特徴の1つは、荷台の外側下部は、複数の保温用シート(例えば、実施形態における前側保温用シート21,中間保温用シート30,後側保温用シート40)によって覆われ、これらの保温用シートは、車体前後方向に隣接する保温用シートのうち、前側に位置する保温用シートの後端部を後側に位置する保温用シートの前端部上に重ねるように配置されることを特徴とする。   Also, one of the features is that the outer lower part of the cargo bed is covered with a plurality of heat insulation sheets (for example, the front heat insulation sheet 21, the intermediate heat insulation sheet 30, and the rear heat insulation sheet 40 in the embodiment), The seat for heating is arranged so that the rear end portion of the heat insulation sheet located on the front side of the heat insulation sheets adjacent in the longitudinal direction of the vehicle body overlaps the front end portion of the heat insulation sheet located on the rear side. And

この特徴によれば、荷台の外側下部を複数の保温用シートで覆うことにより、保温用シートの大きさが過大になるのを防止して、荷台外側下部を保温用シートで覆う作業の作業性を向上することができる。また車体前後方向に隣接する保温用シートのうち車体前側に位置する保温用シートの後端部を車体後側に位置する保温用シートの前端部上に重なるように配置することで、車両が前進走行したときに、風が保温用シート間の隙間から入り難くすることができ、保温用シートが風によって剥れる事態を抑制することができる。   According to this feature, by covering the outer lower part of the cargo bed with a plurality of heat insulating sheets, it is possible to prevent the size of the heat insulating sheet from becoming excessively large, and the workability of the work of covering the outer lower part of the cargo bed with the heat insulating sheet. Can be improved. Further, the vehicle moves forward by arranging the rear end portion of the heat insulation sheet located on the front side of the vehicle body in the heat insulation sheet adjacent to the vehicle longitudinal direction so as to overlap the front end portion of the heat insulation sheet located on the rear side of the vehicle body. When traveling, it can be made difficult for the wind to enter from the gap between the heat insulation sheets, and the situation where the heat insulation sheet is peeled off by the wind can be suppressed.

また特徴の1つは、車体前後方向に隣接して端部同士が重なる保温用シートのうち、重ねる側の保温用シートに係合孔部を設け、重ねられる側の保温用シートに係合孔部に係止される係止突起部を設けることを特徴とする。   Further, one of the features is that, among the heat insulating sheets that are adjacent to each other in the longitudinal direction of the vehicle body and overlap each other, an engagement hole is provided in the heat retention sheet on the overlapping side, and the engagement hole is formed in the heat retention sheet on the overlapping side. A locking projection that is locked to the portion is provided.

この特徴によれば、重ねる側の保温用シートに係合孔部を設け、重ねられる側の保温用シートに係止突起部を設けることにより、前後方向に隣接して配置された保温用シート同士を確実に接続して、車両走行時において、保温用シートの重ね合わされた部分が風によって剥れる事態をより抑制することができる。   According to this feature, the heat retaining sheets disposed adjacent to each other in the front-rear direction are provided by providing an engagement hole in the heat retaining sheet on the overlapping side and providing a locking projection on the heat retaining sheet on the stacked side. Can be reliably connected, and the situation where the overlapped portions of the heat insulation sheets are peeled off by the wind can be further suppressed when the vehicle is traveling.

また特徴の1つは、保温用シートの端部に、基端側が該保温用シートの表面に固着された固着部と、該固着部に繋がって伸縮自在な帯部と、該帯部の先端部に取り付けられて起立したあおりの上部に掛止可能なフック部とを有して保温用シートを荷台に止めるシート係止手段を設けることを特徴とする。   Also, one of the features is that an end portion of the heat insulating sheet has a fixed portion whose base end is fixed to the surface of the heat insulating sheet, a band portion that is stretchable connected to the fixed portion, and a distal end of the band portion. And a hook portion that can be hooked on an upper portion of an upright lift that is attached to the portion, and is provided with sheet locking means for holding the heat-retaining sheet on the cargo bed.

この特徴によれば、保温用シートの端部に、固着部と帯部とフック部とを有してなるシート係止手段を設けることにより、保温用シートの端部を荷台の側板や
前板の外側面に沿わせた状態でフック部を側板等の上部に掛止するだけで、保温用シートを緊張させた状態で荷台の外側下部に設けることができる。
According to this feature, by providing a sheet locking means having an adhering portion, a belt portion, and a hook portion at the end portion of the heat retaining sheet, the end portion of the heat retaining sheet is attached to the side plate or front plate of the loading platform. By simply hooking the hook portion to the upper part of the side plate or the like in a state along the outer side surface, the heat retaining sheet can be provided on the outer lower part of the cargo bed in a tensioned state.

また特徴の1つは、複数の保温用シートによって、荷台の外側下部の前方及び側方の全てを覆うことを特徴とする。   In addition, one of the features is that all of the front and sides of the outer lower portion of the cargo bed are covered with a plurality of heat insulating sheets.

この特徴によれば、複数の保温用シートによって荷台の外側下部の前方及び側方の全てを覆うことより、荷台の床板の下方に、より大きな空気滞留層を形成することができ、床下からのアスファルト混合物の放熱をより抑えて、アスファルト混合物の冷却防止効果をさらに向上することができる。   According to this feature, by covering all of the front and side of the outer lower part of the cargo bed with a plurality of heat insulation sheets, a larger air retention layer can be formed below the floor plate of the cargo bed, The heat dissipation of the asphalt mixture can be further suppressed, and the cooling prevention effect of the asphalt mixture can be further improved.

また特徴の1つは、荷台は、該荷台の底部と車体との間に取り付けられたシリンダ機構部によって傾動可能であり、シリンダ機構部は、これが伸長して荷台が傾動すると、該シリンダ機構部自体も傾動するように取り付けられ、荷台の下部のうちシリンダ機構部が延出する部分を覆う保温用シートには、シリンダ機構部が伸長すると、該シリンダ機構部の傾動に応じて荷台底部から離反する方向に移動するシリンダ機構部の先端部(例えば、実施形態におけるリフトアーム52)を受容する受容部分が設けられることを特徴とする。   Also, one of the features is that the loading platform can be tilted by a cylinder mechanism portion attached between the bottom of the loading platform and the vehicle body. When the loading mechanism tilts as the cylinder mechanism portion extends, the cylinder mechanism portion When the cylinder mechanism is extended, the heat insulation sheet that is attached so as to tilt and covers the portion of the lower part of the cargo bed where the cylinder mechanism extends is separated from the bed bottom according to the tilt of the cylinder mechanism. A receiving portion for receiving the tip of the cylinder mechanism that moves in the direction (for example, the lift arm 52 in the embodiment) is provided.

この特徴によれば、保温用シートに、シリンダ機構部の傾動に応じて荷台底部から離反する方向に移動するシリンダ機構部の先端部を受容する受容部分を設けることで、シリンダ機構部が伸長してこの先端部が荷台底部から離反する方向に移動しても、保温用シートがシリンダ機構部の先端部と干渉して保温用シートが損傷する事態を未然に防止することができる。   According to this feature, by providing the heat retaining sheet with a receiving portion that receives the tip of the cylinder mechanism that moves away from the bottom of the cargo bed according to the tilt of the cylinder mechanism, the cylinder mechanism extends. Even if the leading end of the lever moves in a direction away from the bottom of the cargo bed, it is possible to prevent a situation in which the heat insulating sheet interferes with the front end of the cylinder mechanism and the heat insulating sheet is damaged.

また本発明の特徴は、走行可能な車体と、該車体に対して傾動可能な荷台とを備え、該荷台にアスファルト混合物を積載して運搬可能な運搬用車両において、前記荷台に積載されたアスファルト混合物をその表面にシートを被せて運搬するアスファルト混合物運搬方法であって、前記荷台の外側下部を覆う底面部と該底面部の左右両側に繋がって延び前記荷台の左右両側方を覆う一対の側面部と前記荷台の前方を覆う前面部を有する保温用シートを用い、前記荷台の外側下部を少なくとも前方及び側方に亘って前記保温用シートで覆い、前記荷台の床板の裏面下に前記保温用シートで覆われた空気滞留層を形成した荷台に、前記アスファルト混合物を積載して運搬することを特徴とする。 In addition, the present invention is characterized in that a transport vehicle including a vehicle body that can travel and a cargo bed that can tilt with respect to the vehicle body and that can be transported by loading an asphalt mixture on the cargo bed, the asphalt loaded on the cargo bed. the mixture was asphalt mixture transportation method for transporting covered with a sheet over to its own surface, a pair of covering the left and right both sides of the loading platform extending led to the right and left sides of the bottom and bottom surface portion covering the outside bottom of the loading platform using the heat insulating sheet having a front portion side portion of the covering the front of the cargo bed, the covered with thermal insulation sheet outside lower portion of the bed at least over the front and side, said the back side of a said cargo bed floor The asphalt mixture is loaded and transported on a cargo bed formed with an air retention layer covered with a heat insulating sheet.

この特徴によれば、荷台の外側下部を少なくとも前方及び側方に亘って覆う保温用シートを設けて荷台の床板の裏面下に保温用シートで覆われた空気滞留層を形成した荷台に、アスファルト混合物を積載して運搬することによって、荷台の床板の下方に断熱層を設けることができ、簡易な設備の追加でアスファルト混合物の温度低下を効果的に抑制することができ、長時間の運搬が可能であり、汎用性があり、経済的であり、環境問題においても良好にすることができる。   According to this feature, the asphalt is provided with a heat retaining sheet that covers at least the front lower portion and the lateral lower portion of the cargo bed, and an air retention layer covered with the heat retaining sheet is formed under the back surface of the floor plate of the cargo bed. By loading and transporting the mixture, a heat insulation layer can be provided under the floor of the loading platform, and the temperature drop of the asphalt mixture can be effectively suppressed with the addition of simple equipment. It is possible, versatile, economical, and good in environmental problems.

また特徴の1つは、荷台の外側下部を覆う複数の保温用シートを、車体前後方向に隣接する保温用シートのうち前側に位置する保温用シートの後端部が後側に位置する保温用シートの前端部上に重なるように、荷台の後側から前側に順に取り付けることを特徴とする。   Also, one of the features is that a plurality of heat-insulating sheets covering the outer lower part of the loading platform are used for heat-retaining with the rear end portion of the heat-retaining sheet located on the front side among the heat-retaining sheets adjacent in the longitudinal direction of the vehicle body located on the rear side. The sheet is attached in order from the rear side to the front side of the loading platform so as to overlap the front end portion of the seat.

この特徴によれば、荷台の外側下部を覆う複数の保温用シートを、荷台の後側から前側に順に取り付けることで、車体前後方向に隣接する保温用シートのうち後側に位置する保温用シートの前端部上に前側の保温用シートの後端部が重なるようにする保温用シートの配置作業の作業性を向上することができる。   According to this feature, by attaching a plurality of heat insulation sheets covering the outer lower part of the cargo bed in order from the rear side to the front side of the cargo bed, the heat insulation sheet located on the rear side among the heat insulation sheets adjacent in the vehicle body longitudinal direction It is possible to improve the workability of the operation of arranging the heat insulating sheet so that the rear end portion of the front heat insulating sheet overlaps the front end portion.

本発明に係わる運搬用車両及びアスファルト混合物運搬方法によれば、前述の特徴を有することで、簡易な設備の追加でアスファルト混合物の温度低下を効果的に抑制することができ、長時間の運搬が可能であり、汎用性があり、経済面・環境面で良好な運搬用車両及びアスファルト混合物運搬方法を提供することができる。   According to the transport vehicle and the asphalt mixture transport method according to the present invention, by having the above-described features, it is possible to effectively suppress the temperature drop of the asphalt mixture with the addition of simple equipment, and to transport for a long time. It is possible to provide a vehicle for transportation and an asphalt mixture transportation method that are possible, versatile, and favorable in terms of economy and environment.

以下、本発明に係わる運搬用車両及びアスファルト混合物運搬方法の実施形態を図2から図6に基づいて説明する。本実施形態は、土砂等を運搬するダンプトラック、特に、荷台が車両後方側に傾動するダンプトラックを例にして説明する。先ず、アスファルト混合物運搬方法を説明する前に、運搬用車両の一例であるダンプトラックについて説明する。   Hereinafter, embodiments of a transport vehicle and an asphalt mixture transport method according to the present invention will be described with reference to FIGS. In the present embodiment, a dump truck that transports earth and sand, in particular, a dump truck in which a loading platform tilts toward the vehicle rear side will be described as an example. First, before explaining the asphalt mixture carrying method, a dump truck which is an example of a carrying vehicle will be explained.

ダンプトラック1は、図2(a)(側面図)及び図2(b)(側面図)に示すように、走行可能な車体3と、車体3の後側に設けられた荷台10と、荷台10に積載されたアスファルト混合物からの放熱を防止する保温用シート20とを備えて構成される。車体3の前側には運転キャビン5が設けられ、運転キャビン5の下部の車体前部及び車体後部には左右一対の前輪6及び後輪7が配設されている。前輪6は操舵可能に構成され、後輪7は図示しないエンジンからの動力を受けて回転駆動可能に構成されている。   As shown in FIG. 2A (side view) and FIG. 2B (side view), the dump truck 1 includes a travelable vehicle body 3, a cargo bed 10 provided on the rear side of the vehicle body 3, and a cargo bed. 10 and a heat retaining sheet 20 for preventing heat dissipation from the asphalt mixture loaded on the vehicle. A driving cabin 5 is provided on the front side of the vehicle body 3, and a pair of left and right front wheels 6 and a rear wheel 7 are disposed on the vehicle body front portion and the vehicle body rear portion below the driving cabin 5. The front wheels 6 are configured to be steerable, and the rear wheels 7 are configured to be rotationally driven by receiving power from an engine (not shown).

荷台10は、車体3と荷台10との間に配設されたシリンダ機構部50によって荷台10の後端部を支点として荷台前側が起仰して荷台10の床板11が後方側に傾斜して、積載物を後端から排出可能になっている。シリンダ機構部50は、ボトム側端部が車体3に枢結されて車両後方側に延びるホイストシリンダ51と、ホイストシリンダ51のロッド側端部に枢結されて荷台前側に延びるリフトアーム52と、リフトアーム52の先端部とホイストシリンダ51のボトム側端部との間に設けられたテンションリンク部材53とを有してなる。リフトアーム52の先端部は荷台10の底部に枢結されている。   The loading platform 10 is configured such that the front side of the loading platform rises with the rear end portion of the loading platform 10 as a fulcrum by the cylinder mechanism 50 disposed between the vehicle body 3 and the loading platform 10 and the floor plate 11 of the loading platform 10 is inclined rearward. The load can be discharged from the rear end. The cylinder mechanism 50 includes a hoist cylinder 51 whose bottom end is pivotally connected to the vehicle body 3 and extends toward the rear of the vehicle, a lift arm 52 that is pivotally connected to the rod end of the hoist cylinder 51 and extends to the front of the loading platform, A tension link member 53 is provided between the tip end of the lift arm 52 and the bottom end of the hoist cylinder 51. The tip of the lift arm 52 is pivotally connected to the bottom of the loading platform 10.

シリンダ機構部50は、ホイストシリンダ51が伸長すると、ホイストシリンダ51が起仰するとともにリフトアーム52の先端部が荷台10の底部から離反する方向に回動して、荷台10が後方側に傾斜する。また伸長したホイストシリンダ51が縮小すると、ホイストシリンダ51が倒伏するとともにリフトアーム52の先端部が荷台10の底部側に接近する方向に回動して、荷台10を水平状態に戻す。   When the hoist cylinder 51 is extended, the cylinder mechanism 50 is lifted up, and the tip of the lift arm 52 rotates in a direction away from the bottom of the cargo bed 10, so that the cargo bed 10 is inclined rearward. . Further, when the extended hoist cylinder 51 is contracted, the hoist cylinder 51 falls and the tip of the lift arm 52 rotates in a direction approaching the bottom side of the cargo bed 10 to return the cargo bed 10 to a horizontal state.

荷台10は、床板11の前部に板状の前板12を備え、床板11の左右両側に一対の側板13を備え、床板11の後端に後板17を備えて構成されている。前板12は床板11から上方へ延びて運転キャビン5を保護する。後板17は、上部が一対の側板13の後端上部に回動自在に取り付けられており、積載物を排出するときには、荷台10を後方側に傾斜させて、後板17を開いた状態にする。   The loading platform 10 includes a plate-like front plate 12 at the front portion of the floor plate 11, a pair of side plates 13 on both the left and right sides of the floor plate 11, and a rear plate 17 at the rear end of the floor plate 11. The front plate 12 extends upward from the floor plate 11 to protect the operation cabin 5. The upper portion of the rear plate 17 is pivotally attached to the upper rear end portion of the pair of side plates 13, and when the load is discharged, the loading platform 10 is inclined rearward so that the rear plate 17 is opened. To do.

側板13は、図3(a)(説明図)及び図3(b)(説明図)に示すように、床板11の側部に一体的に取り付けられて上下方向に延び、側板13の下部は床板11よりも下方に延びる。このため、荷台10の前端下部には、床板11とこれより下方に延びる一対の側板13の下方延長部13aによって囲まれて前方に向いた前側開口部14が開口し、また荷台10の底部には、一対の側板13の下方延長部13aによって囲まれて下方に向いた下側開口部15が開口している。なお、荷台10の後端下部には、床板11とこれより下方に延びる一対の側板13の下方延長部13aによって囲まれて後方に向いた後側開口部16が開口している。   As shown in FIGS. 3A (description) and FIG. 3B (description), the side plate 13 is integrally attached to the side portion of the floor plate 11 and extends in the vertical direction. It extends below the floor board 11. For this reason, a front opening 14 is formed in the lower part of the front end of the loading platform 10, which is surrounded by the floor plate 11 and the lower extensions 13 a of the pair of side plates 13 extending downward from the floor plate 11. Has a lower opening 15 that is surrounded by the lower extension 13a of the pair of side plates 13 and that faces downward. In addition, a rear side opening portion 16 which is surrounded by a floor plate 11 and a lower extension portion 13a of a pair of side plates 13 extending downward from the floor plate 11 and facing rearward is opened in a lower rear end portion of the loading platform 10.

保温用シート20は、前側保温用シート21、中間保温用シート30、後側保温用シート40から構成されている。前側保温用シート21は、図3及び図4(説明図)に示すように、前側開口部14を覆う前面部22と、下側開口部15の前側を覆う底面部23と、底面部23の左右両側部に繋がって延びる一対の側面部24とを有してなる。前面部22は矩形状に形成されて前側開口部14を覆うことが可能な大きさを有する。底面部23は矩形状に形成されて下側開口部15の前側を覆うことが可能な大きさを有する。側面部24は矩形状に形成されて側板13の高さ方向寸法よりも大きな寸法を有する。このため、前面部22によって前側開口部14を覆い且つ底面部23によって下側開口部15を覆った状態で、側面部24を側板13の外側面に沿って配置し、且つ前面部22を前板12の外側面に沿って配置すると、側面部24の上部は側板13の上端から延出して、これを側板13の内側に折ることができ、また前面部22の上端は前板12の中間位置まで延ばすことができる。   The heat retaining sheet 20 includes a front heat retaining sheet 21, an intermediate heat retaining sheet 30, and a rear heat retaining sheet 40. As shown in FIG. 3 and FIG. 4 (explanatory view), the front heat retaining sheet 21 includes a front surface portion 22 that covers the front opening portion 14, a bottom surface portion 23 that covers the front side of the lower opening portion 15, and a bottom surface portion 23. It has a pair of side surface parts 24 connected to the left and right side parts and extending. The front surface portion 22 is formed in a rectangular shape and has a size that can cover the front opening 14. The bottom surface portion 23 is formed in a rectangular shape and has a size capable of covering the front side of the lower opening 15. The side surface portion 24 is formed in a rectangular shape and has a size larger than the height direction size of the side plate 13. For this reason, the side surface portion 24 is disposed along the outer surface of the side plate 13 with the front surface portion 22 covering the front opening portion 14 and the bottom surface portion 23 covering the lower opening portion 15, and the front surface portion 22 is disposed in front. When arranged along the outer surface of the plate 12, the upper portion of the side surface portion 24 extends from the upper end of the side plate 13 and can be folded inside the side plate 13, and the upper end of the front surface portion 22 is the middle of the front plate 12. Can extend to position.

中間保温用シート30は、下側開口部15の中間部を覆う底面部31と、底面部31の左右両側部に繋がって延びる一対の側面部32とを有してなる。底面部31は矩形状に形成されて下側開口部15の中間部を覆うことが可能な大きさを有する。側面部32は矩形状に形成されて側板13の高さ方向寸法よりも大きな寸法を有する。底面部31によって下側開口部15を覆った状態で、側面部32を側板13の外側面に沿って配置すると、側面部32の上部は側板13の上端から延出して、これを側板13の内側に折ることができる。   The intermediate heat retaining sheet 30 includes a bottom surface portion 31 that covers an intermediate portion of the lower opening 15 and a pair of side surface portions 32 that are connected to both the left and right side portions of the bottom surface portion 31. The bottom surface portion 31 is formed in a rectangular shape and has a size capable of covering the middle portion of the lower opening 15. The side part 32 is formed in a rectangular shape and has a dimension larger than the dimension in the height direction of the side plate 13. When the side surface portion 32 is disposed along the outer surface of the side plate 13 with the bottom opening portion 31 covering the lower opening 15, the upper portion of the side surface portion 32 extends from the upper end of the side plate 13, and this is Can be folded inward.

後側保温用シート40は、下側開口部15のうちのシリンダ機構部50が延出する後部を覆うものであり、この後部を覆う底面部41と、底面部41の左右両側部に繋がって延びる一対の側面部42とを有してなる。底面部41は矩形状に形成されて下側開口部15の後端部を覆うことが可能な大きさを有するとともに、ホイストシリンダ51の伸長に応じて荷台底部から離反する方向に移動するリフトアーム52を受容する受容部分43を有する。受容部分43は、山折りにされて前後方向に延びる折り曲げ線Lを中央にして左右対称に繋がる三角面部43aを有して凸状に形成されている。三角面部43aは折り曲げ線Lの部分を底辺とし、側面部42に繋がる部分を斜辺として形成されている。このように受容部分43を底面部41に設けることで、ホイストシリンダ51が伸縮してリフトアーム52の先端側が荷台底部から離反する方向に回動しても、リフトアーム52は受容部分43に受容されるので、後側保温用シート40が損傷する虞はない。   The rear heat retaining sheet 40 covers the rear portion of the lower opening 15 from which the cylinder mechanism portion 50 extends, and is connected to the bottom surface portion 41 covering the rear portion and the left and right side portions of the bottom surface portion 41. It has a pair of side part 42 extended. The bottom surface portion 41 is formed in a rectangular shape and has a size capable of covering the rear end portion of the lower opening 15 and moves in a direction away from the cargo bed bottom as the hoist cylinder 51 extends. 52 has a receiving portion 43 for receiving 52. The receiving portion 43 is formed in a convex shape having a triangular surface portion 43a that is folded in a mountain and extends symmetrically with a bending line L extending in the front-rear direction as a center. The triangular surface part 43a is formed with the part of the fold line L as the base and the part connected to the side part 42 as the oblique side. By providing the receiving portion 43 on the bottom surface portion 41 in this way, the lift arm 52 is received by the receiving portion 43 even if the hoist cylinder 51 expands and contracts and the tip end side of the lift arm 52 rotates in a direction away from the cargo bed bottom portion. Therefore, there is no possibility that the rear heat insulating sheet 40 is damaged.

なお、保温用シート20は、断熱性を有し、高温時の寸法安定性や加熱されたアスファルト混合物の剥離性も良好に構成されたものであり、ポリエステル繊維、ポリアミド繊維、アクリル繊維、ビニロン繊維、ポリイミド繊維、ポリフェニレンスルフィド繊維、アラミド繊維、ガラス繊維などから形成されていることが好ましい。さらに、ゴム引き加工、耐熱性樹脂による膜加工などにより補強加工されていても良い。   The heat insulating sheet 20 has a heat insulating property, and has a good dimensional stability at high temperatures and a good peelability of the heated asphalt mixture. The polyester fiber, the polyamide fiber, the acrylic fiber, and the vinylon fiber. It is preferably formed from polyimide fiber, polyphenylene sulfide fiber, aramid fiber, glass fiber or the like. Further, it may be reinforced by rubber drawing, film processing with a heat resistant resin, or the like.

このように構成された前側保温用シート21、中間保温用シート30、後側保温用シート40のそれぞれには、車体前後方向に隣接する他の保温用シートとの間を接続する接続手段55と、保温用シートを荷台10に取り付けるためのシート係止手段60が設けられている。   Connection means 55 for connecting between each of the front heat retaining sheet 21, the intermediate heat retaining sheet 30, and the rear heat retaining sheet 40 configured as described above and other heat retaining sheets adjacent to each other in the vehicle longitudinal direction. A sheet locking means 60 for attaching the heat retaining sheet to the loading platform 10 is provided.

接続手段55は、車体前後方向に隣接して端部同士が重なる保温用シートのうち重ねる側の保護用シートに設けられる係合孔部56と、重ねられる側の保温用シートに設けられて係合孔部56に係止される係止突起部57とを有してなる。係合孔部56は、前側保温用シート21及び中間保温用シート30の各底面部23,31の後端部に左右方向に所定間隔を有して複数設けられている。係合孔部56は、係止突起部57を係止可能であればその形状は問わない。図面では、図5(a)(斜視図)に示すように、楕円状に形成されている。   The connecting means 55 is provided on the heat retaining sheet on the overlapping side of the heat insulating sheet that is adjacent to the vehicle body in the front-rear direction and overlaps with the end portions, and on the heat retaining sheet on the overlapping side. It has a locking projection 57 that is locked to the hole 56. A plurality of engaging hole portions 56 are provided at predetermined intervals in the left-right direction at the rear end portions of the bottom surface portions 23 and 31 of the front heat retaining sheet 21 and the intermediate heat retaining sheet 30. The shape of the engagement hole portion 56 is not limited as long as the engagement protrusion portion 57 can be engaged. In the drawing, as shown in FIG. 5A (perspective view), it is formed in an elliptical shape.

係止突起部57は、図4及び図5(b)(斜視図)に示すように、底面部31,41に固定された軸部57aと、軸部57aの先端部に回動自在に取り付けられて係合孔部56を通って係合孔部56に係止可能な頭部57bとを有してなる。頭部57bの形状は係合孔部56を通ってこれに係止可能であればその形状は問わない。図面では、楕円状に形成されている。   As shown in FIGS. 4 and 5B (perspective view), the locking projection 57 is rotatably attached to the shaft portion 57a fixed to the bottom surface portions 31 and 41 and the tip portion of the shaft portion 57a. And a head portion 57 b that can be locked to the engagement hole portion 56 through the engagement hole portion 56. The shape of the head 57b is not limited as long as it can be locked to the engaging hole 56 through the engaging hole 56. In the drawing, it is formed in an elliptical shape.

シート係止手段60は、前側保温用シート21の前面部22及び一対の側面部24の外側先端部に取り付けられるとともに、中間保温用シート30及び後側保温用シート40の各一対の側面部32,42の外側先端部に取り付けられている。シート係止手段60は、図6(a)(斜視図)に示すように、基端側が保温用シート20(21,30,40)の表面に固着された固着部61と、固着部61に繋がって伸縮自在な帯部62と、帯部62の先端部に取り付けられて起立した側板13又は前板12の上部に掛止可能なフック部63とを有してなる。   The sheet locking means 60 is attached to the front end portion 22 of the front heat retaining sheet 21 and the outer front end portion of the pair of side surface portions 24, and the pair of side surface portions 32 of the intermediate heat retaining sheet 30 and the rear heat retaining sheet 40. , 42 are attached to the outer front ends. As shown in FIG. 6A (perspective view), the sheet locking means 60 includes a fixing portion 61 whose base end side is fixed to the surface of the heat retaining sheet 20 (21, 30, 40), and a fixing portion 61. The belt unit 62 includes a band unit 62 that is connected and can be stretched, and a hook unit 63 that can be hooked on an upper portion of the side plate 13 or the front plate 12 that is attached to the tip of the band unit 62 and stands upright.

次に、このように構成されたダンプトラック1によってアスファルト混合物を運搬する際のアスファルト混合物運搬方法について説明する。先ず、図3、図4、図6(b)に示すように、荷台10の底部が露出するようにシリンダ機構部50を伸長させる。そして、後側保温用シート40を広げ、係止突起部57が前側に位置し且つ受容部43内にシリンダ機構部50のリフトアーム52が受容されるように後側保温用シート40を配置して、底面部41によって下側開口部15の後部を覆う。そして、側板13の外面に沿って側面部42を延ばし、側板13の先端から突出した側面部42を側板13の内側に折る。そして、シート係止手段60のフック部63を介して帯部62を伸長させて、フック部63を側板13の上端部に掛止する。その結果、後側保温用シート40は、帯部62の縮小によって緊張した状態で荷台10の下部に取り付けることができるとともに、床板11の下方に空間部70を形成することができる。   Next, the asphalt mixture carrying method when carrying the asphalt mixture by the dump truck 1 configured as described above will be described. First, as shown in FIGS. 3, 4, and 6 (b), the cylinder mechanism 50 is extended so that the bottom of the loading platform 10 is exposed. Then, the rear heat insulating sheet 40 is expanded, and the rear heat insulating sheet 40 is arranged so that the locking projection 57 is positioned on the front side and the lift arm 52 of the cylinder mechanism 50 is received in the receiving portion 43. The bottom portion 41 covers the rear portion of the lower opening 15. Then, the side surface portion 42 is extended along the outer surface of the side plate 13, and the side surface portion 42 protruding from the tip of the side plate 13 is folded inside the side plate 13. Then, the band portion 62 is extended via the hook portion 63 of the sheet locking means 60, and the hook portion 63 is hooked on the upper end portion of the side plate 13. As a result, the rear heat retaining sheet 40 can be attached to the lower portion of the loading platform 10 in a tensioned state due to the reduction of the band portion 62, and the space portion 70 can be formed below the floor board 11.

次に、中間温用シート30を広げ、係止突起部57が前側に位置するように中間温用シート30を荷台10の底面側に配置し、中間温用シート30の底面部31によって下側開口部15を覆う。このとき、後側保温用シート40の前端部上に中間保温用シート30の後端部が重なるように配置し、係合孔部56内に係止突起部57を挿入して回動して係止突起部57を係合孔部56に係止する。   Next, the intermediate temperature sheet 30 is spread, and the intermediate temperature sheet 30 is arranged on the bottom surface side of the loading platform 10 so that the locking projection 57 is located on the front side. The opening 15 is covered. At this time, the rear heat insulation sheet 30 is arranged so that the rear end of the intermediate heat insulation sheet 30 overlaps the front end of the rear heat insulation sheet 40, and the locking projection 57 is inserted into the engagement hole 56 and rotated. The locking projection 57 is locked in the engagement hole 56.

そして、側板13の外面に沿って側面部32を延ばし、側板13上端から突出した側面部32を側板13の内側に折る。そして、シート係止手段60のフック部63を介して帯部62を伸長させて、側面部32を介してフック部63を側板13の上端部に掛止する。その結果、中間保温用シート30は、帯部62の縮小によって緊張した状態で荷台10の下部に取り付けることができるとともに、床板11の下方に空間部71を形成することができる。   Then, the side surface portion 32 is extended along the outer surface of the side plate 13, and the side surface portion 32 protruding from the upper end of the side plate 13 is folded inside the side plate 13. Then, the band portion 62 is extended via the hook portion 63 of the sheet locking means 60, and the hook portion 63 is hooked to the upper end portion of the side plate 13 via the side surface portion 32. As a result, the intermediate heat retaining sheet 30 can be attached to the lower portion of the loading platform 10 in a tensioned state due to the reduction of the belt portion 62, and the space portion 71 can be formed below the floor board 11.

次に、前側保温用シート21を広げ、係合孔部56が後側に位置するように前側保温用シート21を荷台10の前側の底面に配置し、前側温用シート21の前面部22によって前側開口部14を覆い、前側温用シート21の底面部23によって下側開口部15を覆う。このとき、中間保温用シート30の前端部上に前側保温用シート21の後端部が重なるように配置し、係合孔部56内に係止突起部57を挿入して回動して係止突起部57を係合孔部56に係止する。   Next, the front heat insulating sheet 21 is expanded, and the front heat insulating sheet 21 is disposed on the bottom surface on the front side of the loading platform 10 so that the engagement hole portion 56 is located on the rear side. The front opening 14 is covered, and the lower opening 15 is covered by the bottom 23 of the front warm sheet 21. At this time, it is arranged so that the rear end portion of the front heat retaining sheet 21 overlaps with the front end portion of the intermediate heat retaining sheet 30, and the engaging projection portion 57 is inserted into the engaging hole portion 56 and rotated to engage. The stop projection 57 is locked to the engagement hole 56.

そして、側板13の外面に沿って側面部24を延ばし、側板13上端から突出した側面部24を側板13の内側に折る。そして、シート係止手段60のフック部63を介して帯部62を伸長させて、側面部24を介してフック部63を側板13の上端部に掛止する。また前板12の外側面に沿って前面部22を延ばし、シート係止手段60のフック部63を介して帯部62を伸長させて、フック部63を前板12の上端部に掛止する。その結果、前側保温用シート21は、帯部62の縮小によって緊張した状態で荷台10の下部に取り付けられるとともに、床板11の下方に空間部72を形成することができる。ここで、形成された空間部70,71,72は連通状態にあり、この前側は前側保温用シート21によって塞がれているので、車両が走行しても保温用シート内側の空気は滞留した状態になる。   Then, the side surface portion 24 is extended along the outer surface of the side plate 13, and the side surface portion 24 protruding from the upper end of the side plate 13 is folded inside the side plate 13. Then, the band portion 62 is extended via the hook portion 63 of the sheet locking means 60, and the hook portion 63 is hooked to the upper end portion of the side plate 13 via the side surface portion 24. Further, the front surface portion 22 is extended along the outer surface of the front plate 12, the belt portion 62 is extended through the hook portion 63 of the sheet locking means 60, and the hook portion 63 is hooked on the upper end portion of the front plate 12. . As a result, the front heat retaining sheet 21 can be attached to the lower part of the loading platform 10 in a tensioned state due to the reduction of the band part 62, and the space part 72 can be formed below the floor board 11. Here, the formed space portions 70, 71, 72 are in communication with each other, and the front side is blocked by the front heat insulation sheet 21, so that the air inside the heat insulation sheet stays even when the vehicle travels. It becomes a state.

このように、前側保温用シート21、中間保温用シート30及び後側保温用シート40を車体後側から前側に荷台底部に取り付けると、荷台10の床板11の下方に連通状態にある空間部70,71,72内の滞留する空気からなる空気滞留層73を形成することができる。そして、荷台10の床板11が水平方向になるように、シリンダ機構部50を縮小させる。そして、荷台10にアスファルト混合物Aを積載し、このアスファルト混合物Aの表面を表側保温用シート45で覆い、車両を走行させてアスファルト混合物Aを工事現場に運搬する。   As described above, when the front heat retaining sheet 21, the intermediate heat retaining sheet 30, and the rear heat retaining sheet 40 are attached to the bottom of the cargo bed from the rear side to the front side of the vehicle body, the space 70 that is in communication with the floor plate 11 of the cargo bed 10 is provided below. , 71, 72 can be formed with the air staying layer 73 made of the staying air. And the cylinder mechanism part 50 is shrunk | reduced so that the floor board 11 of the loading platform 10 may become a horizontal direction. Then, the asphalt mixture A is loaded on the loading platform 10, the surface of the asphalt mixture A is covered with the front heat insulating sheet 45, and the vehicle is driven to transport the asphalt mixture A to the construction site.

ここで、荷台10の床板11の下方に形成された空気滞留層73は断熱層として機能する。このため、床板11の下部からのアスファルト混合物Aの放熱を抑えることができ、アスファルト混合物Aの冷却防止効果を向上することができる。このため、床板11からのアスファルト混合物Aの放熱を抑えることができ、アスファルト混合物Aの冷却防止効果を向上することができる。従って、アスファルト混合物Aの温度低下による品質劣化を最小限に抑えることができ、品質劣化して作業廃棄物となるアスファルト混合物Aの量が少なくなって無駄がなくなり環境面においても良好となり、また長時間の運搬ができ、特に寒冷地等の運搬に効果をより発揮することができる。また、ダンプトラック1の荷台10の下部に保温用シート20を装着するだけであるので、土砂等を運搬するときにこれが邪魔にならなければ、保温用シート20をそのままの状態にしておいてもよいので、保温用シート20が存在しても、ダンプトラック1の運搬対象物が限定されるものではなく、アスファルト混合物以外の土砂等の運搬も可能であり、ダンプトラック1の汎用性が狭くなることもない。さらに、保温用シート20は、既存のダンプトラック1の荷台10に取り付けるだけであるので、新たな設備負担のコストの増加を抑制することができて極めて経済的である。   Here, the air retention layer 73 formed below the floor plate 11 of the loading platform 10 functions as a heat insulating layer. For this reason, the heat dissipation of the asphalt mixture A from the lower part of the floor board 11 can be suppressed, and the cooling prevention effect of the asphalt mixture A can be improved. For this reason, the heat dissipation of the asphalt mixture A from the floor board 11 can be suppressed, and the cooling prevention effect of the asphalt mixture A can be improved. Therefore, quality degradation due to a temperature drop of the asphalt mixture A can be minimized, the amount of the asphalt mixture A which becomes quality waste due to quality degradation is reduced, waste is eliminated, and the environment is also improved. It can be transported for a long time, and can be more effective especially in transport in cold regions. In addition, since the heat retaining sheet 20 is only attached to the lower part of the loading platform 10 of the dump truck 1, if this does not get in the way when transporting earth and sand, the heat retaining sheet 20 may be left as it is. Therefore, even if the heat retaining sheet 20 is present, the object to be transported of the dump truck 1 is not limited, and it is possible to transport earth and sand other than the asphalt mixture, and the versatility of the dump truck 1 becomes narrow. There is nothing. Furthermore, since the heat retaining sheet 20 is only attached to the loading platform 10 of the existing dump truck 1, an increase in the cost of a new equipment burden can be suppressed, which is extremely economical.

なお、前述した実施形態では、保温用シート20によって荷台10の底部の略全面を覆うように構成した場合を示したが、冷却防止効果が低下するものでなければ、保温用シート20を荷台底部の前側と中間部のみを覆うようにしてもよい。   In the above-described embodiment, the case where the heat insulating sheet 20 is configured to cover substantially the entire bottom surface of the loading platform 10 has been described. However, if the cooling prevention effect is not reduced, the heat retaining sheet 20 is disposed at the bottom of the loading platform. It is also possible to cover only the front side and the middle part.

また前述したシリンダ機構部50では、リフトアーム52を介してホイストシリンダ51を接続した場合を示したが、ホイストシリンダ51のロッド側端部を荷台10の底部に直接に接続してもよい。また、前述したダンプトラック1は荷台10が後方側に傾斜するものを示したが、荷台10が車両の左右方向にも傾斜するものでもよく、このような車両に前述した保温用シート20を取り付けてもよい。   In the cylinder mechanism 50 described above, the hoist cylinder 51 is connected via the lift arm 52. However, the rod side end of the hoist cylinder 51 may be directly connected to the bottom of the loading platform 10. In addition, the dump truck 1 described above is shown in which the loading platform 10 is inclined rearward. However, the loading platform 10 may be inclined in the left-right direction of the vehicle, and the above-described heat insulation seat 20 is attached to such a vehicle. May be.

〔実験結果〕
本願発明のダンプトラック1の荷台10にアスファルト混合物Aを積載し、このアスファルト混合物Aの表面のみを表側保温用シート45で覆った場合と、アスファルト混合物Aの表面を表側保温用シート45で覆うとともに荷台10の外側下部を前方及び側方の略全面に亘って保温用シート20で覆った場合のアスファルト混合物Aの温度変化を測定した。その結果を図7(a)に示す。図7(a)は、縦軸が温度(℃)を示し、横軸が時間(分)を示している。なお、測定位置は、図7(b)(断面図)に示すように、積載されたアスファルト混合物Aの下面(床板11の上面)と、下面から5cm上方の位置と、下面から10cm上方の位置とした。また測定条件は次の通りである。
1.外気温度: 15〜18℃
2.ダンプトラックの最大積載重量: 2t
3.荷台10へのアスファルト混合物Aの積載重量: 1t
4.ダンプトラックの走行時間: 約4時間
5.ダンプトラックの荷台10の床板11の材質: 鉄
〔Experimental result〕
When the asphalt mixture A is loaded on the loading platform 10 of the dump truck 1 of the present invention, and only the surface of the asphalt mixture A is covered with the front side heat insulating sheet 45, and the surface of the asphalt mixture A is covered with the front side heat insulating sheet 45. The temperature change of the asphalt mixture A when the outer lower part of the loading platform 10 was covered with the heat insulating sheet 20 over the entire front and side was measured. The result is shown in FIG. In FIG. 7A, the vertical axis indicates temperature (° C.), and the horizontal axis indicates time (minutes). As shown in FIG. 7B (cross-sectional view), the measurement positions are as follows: the lower surface of the loaded asphalt mixture A (the upper surface of the floor board 11), a position 5 cm above the lower surface, and a position 10 cm above the lower surface. It was. The measurement conditions are as follows.
1. Outside temperature: 15-18 ° C
2. Maximum loading weight of dump truck: 2t
3. Loading weight of asphalt mixture A on the loading platform 10: 1 t
4. Traveling time of dump truck: about 4 hours 5. Material of floor board 11 of loading platform 10 of dump truck: Iron

このような条件下において測定したアスファルト混合物Aの温度の変化から下記の事項が明らかになった。   From the change in the temperature of the asphalt mixture A measured under such conditions, the following matters became clear.

(1)ダンプトラック走行時間の初期時では、アスファルト混合物Aの下面から
上方に5〜10cmの位置において、保温用シート20の有無に係わらずに173℃前後のピーク温度となった。またアスファルト混合物Aの下面では保温用シート20があるときに121℃となり、保温用シート20がないときに110℃となって、保温用シート20を設けることで、下面において約10℃の保温効果を確認することができた。
(1) At the initial stage of the dump truck running time, the peak temperature was around 173 ° C. at a position 5 to 10 cm above the bottom surface of the asphalt mixture A regardless of the presence or absence of the heat retaining sheet 20. On the lower surface of the asphalt mixture A, the temperature becomes 121 ° C. when the heat insulating sheet 20 is present, and becomes 110 ° C. when there is no heat insulating sheet 20. I was able to confirm.

(2)ダンプトラック走行時間が約4時間後のアスファルト混合物Aの下面の温度は、保温用シート20があるときに91℃となり、保温用シート20がないときに60℃となって、保温用シート20を設けることで、下面において約30℃の保温効果を確認することができた。 (2) The temperature of the lower surface of the asphalt mixture A after the dump truck traveling time is about 4 hours becomes 91 ° C. when there is the heat insulation sheet 20 and becomes 60 ° C. when there is no heat insulation sheet 20 for heat insulation. By providing the sheet 20, a heat retention effect of about 30 ° C. could be confirmed on the lower surface.

(3)ダンプトラック走行時間が約4時間後のアスファルト混合物Aの下面から上方に5〜10cmの位置での温度は、保温用シート20があるときに136℃となり、保温用シート20がないときに103℃となって、保温用シート20を設けることで、下面から5〜10cmの上方位置において約30℃の保温効果を確認することができた。 (3) The temperature at a position of 5 to 10 cm above the lower surface of the asphalt mixture A after about 4 hours of running time of the dump truck is 136 ° C. when the heat retaining sheet 20 is present, and when there is no heat retaining sheet 20 By providing the heat retaining sheet 20 at 103 ° C., it was possible to confirm a heat retaining effect of about 30 ° C. at an upper position of 5 to 10 cm from the lower surface.

このように荷台10の外側下部を保温用シート20で覆うことで、保温効果を確認することができた。また、約4時間後のアスファルト混合物Aの下面温度は、保温用シート20があるときに91℃となって、道路工事等で使用可能なアスファルト混合物Aの下限温度(約110℃)より低くなっているが、この温度低下した部分を含んだアスファルト混合物Aを工事現場で混練すると、温度低下した部分は高い温度の部分と混ざり合って温度上昇して、全体で110℃を超えるアスファルト混合物Aが得られることが確認された。このため、搬送されたアスファルト混合物Aの全てを工事現場で使用することができることを確認した。   Thus, the thermal insulation effect was able to be confirmed by covering the outer lower part of the loading platform 10 with the thermal insulation sheet 20. Further, the lower surface temperature of the asphalt mixture A after about 4 hours becomes 91 ° C. when the heat-insulating sheet 20 is present, and is lower than the lower limit temperature (about 110 ° C.) of the asphalt mixture A that can be used for road construction or the like. However, when the asphalt mixture A including the temperature-decreasing portion is kneaded at the construction site, the temperature-decreasing portion is mixed with the high-temperature portion and the temperature rises, and the asphalt mixture A exceeding 110 ° C. as a whole It was confirmed that it was obtained. For this reason, it confirmed that all of the conveyed asphalt mixture A could be used on a construction site.

従来の運搬用車両を示し、同図(a)は運搬用車両の側面説明図であり、同図(b)は運搬用車両の背面説明図である。A conventional transport vehicle is shown, in which (a) is an explanatory side view of the transport vehicle, and (b) is an explanatory back view of the transport vehicle. 本発明の一実施形態に係わる運搬用車両の側面図を示す。1 shows a side view of a transport vehicle according to an embodiment of the present invention. 本発明の一実施形態に係わる運搬用車両を示し、同図(a)は運搬用車両の側面説明図であり、同図(b)は運搬用車両の背面説明図である。The conveyance vehicle concerning one Embodiment of this invention is shown, The same figure (a) is side explanatory drawing of a conveyance vehicle, The same figure (b) is back surface explanatory drawing of a conveyance vehicle. 本発明の一実施形態に係わる運搬用車両の荷台底部を覆う保温用シートの説明図を示す。Explanatory drawing of the heat retention sheet | seat which covers the loading platform bottom part of the conveyance vehicle concerning one Embodiment of this invention is shown. 本発明の一実施形態に係わる保温用シートを接続するための係合孔部及び係止突起部の斜視図を示す。The perspective view of the engagement hole part and locking protrusion part for connecting the heat retention sheet | seat concerning one Embodiment of this invention is shown. 本発明の一実施形態に係わる保温用シートを側板等に装着するためのシート係止手段の斜視図を示す。The perspective view of the sheet latching means for mounting | wearing the side plate etc. with the heat retention sheet | seat concerning one Embodiment of this invention is shown. 本発明の一実施形態に係わるダンプトラックによって搬送されるアスファルト混合物の温度を測定した実験結果を示し、同図(a)は実験結果を示すグラフであり、同図(b)は測定位置を示した荷台の断面図である。The experimental result which measured the temperature of the asphalt mixture conveyed by the dump truck concerning one Embodiment of this invention is shown, The figure (a) is a graph which shows an experimental result, The figure (b) shows a measurement position. FIG.

符号の説明Explanation of symbols

1 ダンプトラック(運搬用車両)
3 車体
10 荷台
11 床板
13 側板
13a 下方延長部
20 保温用シート
21 前側保温用シート(保温用シート)
30 中間保温用シート(保温用シート)
40 後側保温用シート(保温用シート)
43 受容部
50 シリンダ機構部
52 リフトアーム(シリンダ機構部の先端部)
56 係合孔部
57 係止突起部
60 シート係止手段
61 固着部
62 帯部
63 フック部
73 空気滞留層
A アスファルト混合物
1 Dump truck (transportation vehicle)
DESCRIPTION OF SYMBOLS 3 Car body 10 Loading platform 11 Floor board 13 Side board 13a Lower extension part 20 Thermal insulation sheet 21 Front side thermal insulation sheet (thermal insulation sheet)
30 Intermediate heat insulation sheet (heat insulation sheet)
40 Rear heat insulation sheet (heat insulation sheet)
43 Receiving part 50 Cylinder mechanism part 52 Lift arm (tip part of cylinder mechanism part)
56 engaging hole portion 57 locking projection portion 60 sheet locking means 61 fixing portion 62 band portion 63 hook portion 73 air retention layer A asphalt mixture

Claims (9)

走行可能な車体と、該車体に対して傾動可能な荷台とを備え、該荷台にアスファルト混合物を積載して運搬可能な運搬用車両であって、
前記荷台の外側下部を少なくとも前方及び側方に亘って覆う保温用シートを備え、前記荷台の床板の裏面下に前記保温用シートで覆われた空気滞留層を形成し、
前記保温用シートは、前記荷台の外側下部を覆う底面部と該底面部の左右両側に繋がって延び前記荷台の左右両側方を覆う一対の側面部とを有することを特徴とする運搬用車両。
A vehicle for transportation comprising a vehicle body capable of traveling and a cargo bed tiltable with respect to the vehicle body, the vehicle being capable of carrying an asphalt mixture on the cargo bed,
Comprising a heat insulating sheet for an outer lower portion of the bed covering at least over the front and side, and an air retention layer above covered with thermal insulation sheet on the back surface of a said cargo bed floor,
The heat-retaining sheet includes a bottom surface portion that covers an outer lower portion of the cargo bed and a pair of side surfaces that extend to connect to the left and right sides of the bottom surface portion and cover the left and right sides of the cargo bed .
前記保温用シートは、前記荷台の前方を覆う前面部が前記底面部に繋がっており、
前記空気滞留層は、前記荷台の左右両側に設けられた一対の側板の前記床板より下方へ延びる下方延長部間に形成されることを特徴とする請求項1に記載の運搬用車両。
The heat retaining sheet has a front surface covering the front of the cargo bed connected to the bottom surface,
2. The transport vehicle according to claim 1, wherein the air retention layer is formed between lower extensions extending downward from the floor plate of a pair of side plates provided on both left and right sides of the loading platform.
前記荷台の外側下部は、複数の保温用シートによって覆われ、
これらの保温用シートは、車体前後方向に隣接する保温用シートのうち、前側に位置する保温用シートの後端部を後側に位置する保温用シートの前端部上に重ねるように配置されることを特徴とする請求項1又は2に記載の運搬用車両。
The outer lower part of the cargo bed is covered with a plurality of heat insulating sheets,
These heat insulation sheets are arranged so that the rear end portion of the heat insulation sheet positioned on the front side among the heat insulation sheets adjacent in the longitudinal direction of the vehicle body overlaps the front end portion of the heat insulation sheet located on the rear side. The transport vehicle according to claim 1, wherein the vehicle is a transport vehicle.
車体前後方向に隣接して端部同士が重なる保温用シートのうち重ねる側の保温用シートに係合孔部を設け、重ねられる側の保温用シートに前記係合孔部に係止される係止突起部を設けることを特徴とする請求項3に記載の運搬用車両。   An engagement hole is provided in the heat-holding sheet on the overlapping side among the heat-holding sheets adjacent to each other in the longitudinal direction of the vehicle body, and the engagement is held in the heat-holding sheet on the stacked side by the engagement hole. The transportation vehicle according to claim 3, wherein a stop projection is provided. 前記保温用シートの端部に、基端側が該保温用シートの表面に固着された固着部と、該固着部に繋がって伸縮自在な帯部と、該帯部の先端部に取り付けられて前記荷台の前部に設けられた前板及び前記側板の上部に掛止可能なフック部とを有して前記保温用シートを前記荷台に止めるシート係止手段を設けることを特徴とする請求項1から4のいずれかに記載の運搬用車両。   At the end of the heat retaining sheet, a fixing portion whose base end side is fixed to the surface of the heat insulating sheet, a band portion that is stretchable connected to the fixing portion, and a tip portion of the band portion, 2. A sheet locking means that includes a front plate provided at a front portion of a cargo bed and a hook portion that can be hooked on an upper portion of the side plate, and is provided with a sheet locking means that holds the heat retaining sheet on the cargo bed. To 4. The transport vehicle according to any one of 4 to 4. 前記複数の保温用シートによって、前記荷台の外側下部の前方及び側方の全てを覆うことを特徴とする請求項3から5のいずれかに記載の運搬用車両。   The transport vehicle according to any one of claims 3 to 5, wherein the plurality of heat insulation sheets cover all of the front and sides of the outer lower portion of the cargo bed. 前記荷台は、該荷台の底部と前記車体との間に取り付けられたシリンダ機構部によって傾動可能であり、
前記シリンダ機構部は、これが伸長して前記荷台が傾動すると、該シリンダ機構部自体も傾動するように取り付けられ、
前記荷台の下部のうち前記シリンダ機構部が延出する部分を覆う保温用シートには、前記シリンダ機構部が伸長すると、該シリンダ機構部の傾動に応じて荷台底部から離反する方向に移動する前記シリンダ機構部の先端部を受容する受容部分が設けられることを特徴とする請求項1から6のいずれかに記載の運搬用車両。
The cargo bed can be tilted by a cylinder mechanism attached between the bottom of the cargo bed and the vehicle body,
When the cylinder mechanism part is extended and the loading platform tilts, the cylinder mechanism part itself is also tilted,
When the cylinder mechanism portion is extended on the heat retaining sheet that covers a portion of the lower portion of the loading platform where the cylinder mechanism portion extends, the thermal movement sheet moves in a direction away from the loading platform bottom according to the tilting of the cylinder mechanism portion. The transport vehicle according to any one of claims 1 to 6, further comprising a receiving portion that receives a tip portion of the cylinder mechanism portion.
走行可能な車体と、該車体に対して傾動可能な荷台とを備え、該荷台にアスファルト混合物を積載して運搬可能な運搬用車両において、前記荷台に積載されたアスファルト混合物をその表面にシートを被せて運搬するアスファルト混合物運搬方法であって、
前記荷台の外側下部を覆う底面部と該底面部の左右両側に繋がって延び前記荷台の左右両側方を覆う一対の側面部と前記荷台の前方を覆う前面部を有する保温用シートを用い、
前記荷台の外側下部を少なくとも前方及び側方に亘って前記保温用シートで覆い、前記荷台の床板の裏面下に前記保温用シートで覆われた空気滞留層を形成した荷台に、前記アスファルト混合物を積載して運搬することを特徴とするアスファルト混合物運搬方法。
And drivable vehicle body, and a tiltable loading platform relative to the vehicle body, the transportation vehicles which can transport and load the asphalt mixture to該荷stand, sheet over the asphalt mixture loaded on the loading platform on the surface An asphalt mixture carrying method for carrying
Using a heat insulating sheet having a bottom surface covering the outer lower portion of the cargo bed, a pair of side surfaces covering both the left and right sides of the cargo bed, and a front surface covering the front of the cargo bed.
The covered with thermal insulation sheet outside lower portion of the bed at least over the front and side, in the carrier forming an air retention layer covered by the heat insulating sheet on the backside under the loading platform floor plate, the asphalt mixture An asphalt mixture carrying method characterized by loading and carrying.
前記荷台の外側下部を覆う複数の保温用シートを、車体前後方向に隣接する保温用シートのうち前側に位置する保温用シートの後端部が後側に位置する保温用シートの前端部上に重なるように、前記荷台の後側から前側に順に取り付けることを特徴とする請求項8に記載のスファルト混合物運搬方法。   A plurality of heat insulation sheets covering the outer lower part of the cargo bed are placed on the front end portion of the heat insulation sheet where the rear end portion of the heat insulation sheet located on the front side among the heat insulation sheets adjacent in the longitudinal direction of the vehicle body is located on the rear side. The method for transporting a asphalt mixture according to claim 8, wherein the freight mixture is attached in order from the rear side to the front side of the loading platform so as to overlap.
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