JP2023118709A - Construction machine - Google Patents

Abstract

To improve work efficiency upon replacing a gas container mounted on a revolving super structure.SOLUTION: A gas container 21 and a gas engine 7 are connected to each other through a gas supply pipe conduit 22. A vapor riser 23 for vaporizing gas fuel is provided in the gas supply pipe conduit 22. The gas container 21 is placed over a front direction to a rear direction of a revolving super structure 3. A vapor riser 23 is placed at a rear side position of the gas engine 7.SELECTED DRAWING: Figure 2

Description

The present invention relates to a construction machine such as a hydraulic excavator equipped with a gas engine that uses gas fuel such as LPG as fuel.

A hydraulic excavator, which is a representative example of construction machinery, generally uses a diesel engine that uses light oil as fuel. However, these days, from the viewpoint of global environmental protection, diesel engines are subject to advanced exhaust gas regulations so as to reduce the amount of harmful substances contained in the exhaust gas. For this reason, the diesel engine has a complicated structure and needs to be equipped with new devices, resulting in an increase in cost. Therefore, some hydraulic excavators are equipped with a gas engine that uses gas fuel, such as LPG (Liquefied Petroleum Gas), whose exhaust gas contains less harmful substances than diesel engines.

A hydraulic excavator equipped with a gas engine includes a self-propelled undercarriage, an upper revolving body rotatably provided on the undercarriage, and a work device provided on the front side of the upper revolving body in the front and rear directions. and The upper revolving structure consists of a revolving frame with a working device on the front side, a gas engine on the rear side of the revolving frame that uses gas fuel, and a building with a driver's seat on the left side of the revolving frame. , a hydraulic oil tank located on the right side of the revolving frame and storing hydraulic oil, and a gas container for storing gas fuel to be supplied to the gas engine.

Here, some hydraulic excavators equipped with a gas engine have a structure in which a gas container is arranged on a revolving frame located on the side of a building, and a hydraulic oil tank is arranged above the gas container (Patent Reference 1).

JP-A-6-320968

By the way, since the gas container is formed as a high-strength metal container so as to withstand high internal pressure, the weight of the gas container increases. The gas container is then lifted by hand or lifted by a crane for transportation. In this case, in the configuration in which the hydraulic oil tank is arranged above the gas container, as in Patent Document 1, when the gas container is attached or removed, the gas container is placed laterally while avoiding the hydraulic oil tank. must be moved to As a result, there is a problem that it takes time and effort to replace the gas container.

SUMMARY OF THE INVENTION An object of the present invention is to provide a construction machine capable of improving workability when replacing a gas container.

The present invention comprises a self-propelled lower traveling body, an upper revolving body rotatably provided on the lower traveling body, and a work device provided on the front side in the front and rear directions of the upper revolving body. The upper revolving body includes a revolving frame provided with the working device on the front side, a gas engine provided on the rear side of the revolving frame and using gas fuel as fuel, and a gas engine for storing the gas fuel to be supplied to the gas engine. a gas supply pipeline connecting the gas container and the gas engine and supplying gas fuel from the gas container to the gas engine; and a gas supply pipeline provided in the gas supply pipeline. and a vaporizer for vaporizing the gas fuel, the gas container being provided over the front and rear directions of the upper rotating body, and the vaporizer being arranged at the rear side of the gas engine. is characterized by

According to the present invention, it is possible to improve the workability when exchanging the gas container.

1 is a left side view showing a hydraulic excavator according to an embodiment of the present invention from the left; FIG. FIG. 2 is a front view showing the hydraulic excavator with the working device omitted from the front side; Fig. 2 is a perspective view showing the upper revolving body with parts of the cab box, driver's seat, and exterior cover omitted; FIG. 4 is a perspective view showing a state in which a gas engine, a vaporizer, a gas container bracket, a gas container, and a gas supply pipeline are provided on a revolving frame; FIG. 4 is a perspective view showing a state in which a vaporizer, a gas container bracket, a gas container, and a gas supply pipeline are provided on a revolving frame; FIG. 4 is a perspective view showing a state in which a vaporizer is provided on a revolving frame; It is a perspective view which expands and shows a gas container bracket. FIG. 2 is a block diagram showing the relationship between the gas engine, the vaporizer and the gas container;

1 to 8, a crawler hydraulic excavator will be described in detail below as a representative example of a construction machine according to an embodiment of the present invention. In addition, in this Embodiment, the case where LPG (Liquefied Petroleum Gas, liquefied petroleum gas) is used as gas fuel is illustrated.

In FIG. 1, a hydraulic excavator 1 includes a self-propelled crawler lower traveling body 2, an upper revolving body 3 provided on the lower traveling body 2 so as to be able to turn, and front and rear of the upper revolving body 3. A working device 4 is provided on the front side so as to be able to move up and down and is used for excavating earth and sand.

As shown in FIGS. 2 to 4, the upper revolving body 3 includes a revolving frame 5, a gas engine 7, a cab 9 as a building, a hydraulic oil tank 10, and a gas container 21, which will be described later. Here, the upper rotating body 3 has width dimensions in the left and right directions substantially equal to the vehicle width of the lower traveling body 2 . In addition, the upper revolving body 3 has an arc-shaped counterweight 6 which will be described later. As a result, when the upper swing body 3 swings on the lower traveling body 2, the hydraulic excavator 1 keeps the outer peripheral surface of the counterweight 6 within approximately 120% of the vehicle width dimension of the lower traveling body 2. It is configured as a hydraulic excavator.

As shown in FIGS. 5 and 6, the revolving frame 5 has a bottom plate 5A made of a thick steel plate extending in the front and rear directions, and is erected on the bottom plate 5A with a space left and right in the front and rear direction. The left vertical plate 5B and the right vertical plate 5C, which extend toward the front side and approach each other toward the front side, and the left vertical plate 5B and the right vertical plate 5C at the upper part of the left vertical plate 5B and the right vertical plate 5C are intermediate in the front and rear directions. A top plate 5D extending forward from the top plate 5D, a left side frame 5E disposed on the left side of the left vertical plate 5B with a space therebetween and curved and extending in the front and rear directions, and a space on the right side of the right vertical plate 5C. It includes a right side frame 5F that is arranged and curved while extending in the front and rear directions.

The front portions of the bottom plate 5A, the left vertical plate 5B, the right vertical plate 5C, and the top plate 5D serve as support portions 5G at positions protruding forward. The working device 4 is attached to the supporting portion 5G so as to swing leftward and rightward. A horizontal plate 5H is erected on the revolving frame 5 so as to extend leftward and rightward on the bottom plate 5A across the rear end of the left vertical plate 5B and the rear end of the right vertical plate 5C.

An engine support frame 5J is provided on the rear side of the revolving frame 5 so as to be positioned below the gas engine 7, which will be described later. The engine support frame 5J includes a left vertical frame portion 5J1 and a right vertical frame portion 5J2 extending in the front and rear directions with an interval in the left and right directions, and a rear end of the left vertical frame portion 5J1 and a right vertical frame portion 5J2 extending in the left and right directions. It consists of a rear vertical frame portion 5J3 connected to the rear end of the frame portion 5J2.

The engine support frame 5J is provided with a plurality of, for example, four, engine brackets 5J4 to which the gas engine 7 is attached at intervals in the front, rear, left, and right directions. Furthermore, a vaporizer bracket 5J5 for mounting a vaporizer 23, which will be described later, is provided on the rear vertical frame portion 5J3 and is positioned on the rear side of the gas engine 7. As shown in FIG.

As shown in FIGS. 1 and 3, the counterweight 6 is provided at the rear portion of the revolving frame 5 in order to balance the weight with the working device 4 . The counterweight 6 is formed as an arc-shaped heavy object with the central portion in the left and right directions protruding rearward. The counterweight 6 is arranged on the revolving frame 5 so that the revolving radius of the upper revolving body 3 becomes small.

As shown in FIG. 4, the gas engine 7 is attached to the rear side of the revolving frame 5, specifically to each engine bracket 5J4 of the engine support frame 5J forming the revolving frame 5. As shown in FIG. Thereby, the gas engine 7 is provided on the rear side of the horizontal plate 5H and above the engine support frame 5J. The gas engine 7 uses LPG (liquefied petroleum gas) as gas fuel. The gas engine 7 is mounted on the revolving frame 5 in a horizontal position extending in left and right directions. Here, the gas engine 7 has a water jacket (not shown) through which engine cooling water flows. The water jacket is connected to the radiator of the heat exchange device. The water jacket is also connected to a vaporizer 23, which will be described later.

A hydraulic pump 8 is attached to the left side of the gas engine 7 . The hydraulic pump 8 discharges hydraulic oil supplied from a hydraulic oil tank 10, which will be described later, as pressure oil. On the right side of the gas engine 7, a heat exchange device (not shown) including a radiator, an oil cooler, and the like is arranged.

As shown in FIGS. 1 and 2 , a cab 9 as a building is located on the left side of the revolving frame 5 on the front side of the gas engine 7 . The cab 9 includes a floor member 9A covering the upper portion of the gas engine 7 (hydraulic pump 8) from the front portion of the revolving frame 5, a box-shaped cab box 9B provided on the floor member 9A, and the inside of the cab box 9B. and a driver's seat 9C and the like provided on the floor member 9A. A door 9B1 (see FIG. 1) for entering and exiting the cab is provided on the left side of the cab box 9B so as to be able to be opened and closed. Further, as shown in FIG. 2, the right side of the floor member 9A and the cab box 9B serves as a gas container storage chamber 14, which will be described later.

As shown in FIG. 3 , the hydraulic oil tank 10 is provided on the right side of the revolving frame 5 . The hydraulic oil tank 10 is formed as a rectangular parallelepiped container extending upward and downward, and stores hydraulic oil to be supplied to the hydraulic pump 8 inside. Here, the hydraulic oil tank 10 is arranged with a predetermined gap from the cab 9 . Thus, a gas container storage chamber 14 is provided between the cab 9 and the hydraulic oil tank 10 .

The exterior cover 11 covers the gas engine 7, the hydraulic oil tank 10 and the like provided on the revolving frame 5. As shown in FIG. The exterior cover 11 is composed of a left cover 12, a right cover 13, and the like. The left cover 12 covers the space between the left side frame 5</b>E of the revolving frame 5 and the cab 9 in the front and rear directions, and also covers the left side of the hydraulic pump 8 .

The right cover 13 includes a side cover portion 13A covering the right side surface, a partition cover portion 13B located on the left side of the hydraulic oil tank 10 and extending in the front and rear directions, the side cover portion 13A and the partition cover portion. 13B, and a rear cover portion 13D located behind each of the cover portions 13A to 13C and covering the heat exchange device and the like.

Next, the configuration of the gas container storage chamber 14, which is a feature of this embodiment, will be described in detail.

The gas container storage chamber 14 is located between the cab 9 forming a building and the hydraulic oil tank 10, and is provided on the revolving frame 5 with its upper and front sides opened. The gas container storage chamber 14 constitutes a space for arranging a gas container bracket 15 and a gas container 21 which will be described later. The gas container storage chamber 14 is partitioned on the lower side by the revolving frame 5 , on the left side by the right side surface of the cab 9 , and on the right side by the partition cover portion 13</b>B of the right cover 13 . On the other hand, the gas container storage chamber 14 is open on the upper side and the front side, and the gas container 21 is detachably attached to the gas container storage chamber 14 . Also, the gas container storage chamber 14 is formed at a position lower than the upper position of the counterweight 6 .

As a result, the gas container 21 can be attached to and removed from the gas container storage chamber 14 from above and from the front side of the upper rotating body 3 . Specifically, in the gas container storage chamber 14 whose upper side is open, when the gas container 21 is grasped and lifted by hand or lifted using a crane, the gas container 21 can be lowered from the upper side. can. In addition, it can be removed by lifting it upward. Moreover, since the gas container storage chamber 14 is located between the cab 9 and the hydraulic oil tank 10 and near the center of the upper rotating body 3, the gas container 21 fixed to the gas container storage chamber 14 is There is no danger of colliding with surrounding obstacles.

The gas container bracket 15 stably fixes the gas container 21 to the gas container storage chamber 14 . A gas container bracket 15 is provided on the front right side of the swing frame 5 . The gas container bracket 15 includes a supporting member 18, a fixing member 19, and a regulating member 20, which will be described later. A front substrate 16 and a rear substrate 17, which form the base of the gas container bracket 15, are vertically spaced apart from each other in the front and rear directions, and are fixed to the bottom plate 5A and top plate 5D of the revolving frame 5. .

The support member 18 is formed as an arc-shaped (U-shaped) plate having an axis extending in the front and rear directions. The support member 18 is integrally fixed to the upper portions of the substrates 16 and 17 using welding or the like. The support member 18 is made of a semi-cylindrical plate having a curvature similar to the outer peripheral surface of the gas container 21 so that the gas container 21 can be stably accommodated and arranged at an appropriate position simply by placing the gas container 21 thereon. formed.

The fixing member 19 fixes the gas container 21 supported on the support member 18 between itself and the support member 18 . The fixing member 19 has two engaging holes 19A provided in the right end portion of the supporting member 18 at intervals in the front and rear directions, and the fixing member 19 protrudes upward from the left end portion of the supporting member 18 so as to correspond to each engaging hole 19A. and a belt 19C having one end in the length direction hooked in the engagement hole 19A and the threaded portion 19C1 at the other end in the length direction passing through the top of the belt tightening bracket 19B. It is composed of The belt 19C has a nut 19D screwed to the tip of a threaded portion 19C1 passing through the belt clamping bracket 19B. As a result, the fixing member 19 can fix the gas container 21 supported on the support member 18 between itself and the support member 18 by tightening the nut 19D.

The regulating member 20 is provided on the front substrate 16 . The restricting member 20 restricts the forward movement of the revolving frame 5 of the gas container 21 supported on the supporting member 18 . The regulating member 20 has a lower end attached to the front substrate 16 and an upper end extending upward beyond the bottom of the support member 18 . When the gas container 21 supported on the support member 18 is about to move forward, the regulating member 20 brings the upper part 20A into contact with the container main body 21A of the gas container 21, so that the gas container 21 moves toward the revolving frame 5. can be prevented from being displaced to the front side of the

The gas container 21 is detachably arranged in the gas container storage chamber 14 (gas container bracket 15). The gas container 21 stores LPG to be supplied to the gas engine 7 . The gas container 21 is a transportable tank that can be attached and detached manually or by a crane when refueling. The gas container 21 includes a container main body 21A formed of a cylindrical sealed container, a cock 21B provided at a central position on one side of the container main body 21A in the length direction, and adjusting the supply amount of LPG, and one end of the container main body 21A. A cylindrical protector 21C is provided surrounding the cock 21B on the side. The protector 21C has openings 21C1 that are large and open at a plurality of locations in the circumferential direction, for example, at two locations facing each other in the radial direction. As a result, one side of the opening 21C1 of the protector 21C serves as a bar-shaped handle 21C2. The upper portion 20A of the regulating member 20 is inserted through the opening 21C1 of the protector 21C.

The gas container 21 is attached to the gas container bracket 15 (gas container storage chamber 14) in a sideways state with the cock 21B facing the front side of the revolving frame 5. As shown in FIG. With this mounting structure, the gas container 21 can be reliably fixed with a simple structure. Further, the connection and disconnection work of the gas supply line 22 to the cock 21B and the operation of the cock 21B can be easily performed.

A gas supply line 22 is provided between the gas container 21 and the gas engine 7 . The gas supply line 22 supplies LPG from the gas container 21 toward the gas engine 7 . The gas supply pipe 22 has one lengthwise end (upstream portion) connected to the cock 21B of the gas container 21 and the other lengthwise end (downstream portion) connected to a fuel injection device (not shown) of the gas engine 7 . connected). A vaporizer 23, which will be described later, is provided in the middle of the gas supply pipe 22. As shown in FIG.

Here, as shown in FIG. 5 , the gas supply pipe 22 is connected from the gas container 21 to the vaporizer 23 through the inner side of the engine support frame 5J of the revolving frame 5, that is, the lower side of the gas engine 7. . As a result, the LPG flowing through the gas supply line 22 can be warmed by the heat generated by the gas engine 7, and vaporization can be accelerated. Also, in cold regions, when the vehicle is restarted after being stopped, the LPG kept warm by the heat of the gas engine 7 can be supplied to the gas engine 7, and the sufficiently vaporized LPG can stably start the gas engine 7. be able to.

The vaporizer 23 is arranged on the rear side of the gas engine 7 , that is, attached to the vaporizer bracket 5J5 of the engine support frame 5J that constitutes the revolving frame 5 . The vaporizer 23 is provided in the middle of the gas supply pipe 22 . The vaporizer 23 vaporizes LPG supplied to the gas engine 7 through the gas supply line 22 . The vaporizer 23 uses engine cooling water of the gas engine 7 as a heat source for vaporizing LPG. That is, as shown in FIG. 8, the vaporizer 23 is connected to the water jacket of the gas engine 7 through cooling water pipes 23A and 23B.

The hydraulic excavator 1 according to this embodiment has the configuration described above, and the operation of the hydraulic excavator 1 will now be described.

First, the operator gets into the cab 9, sits on the driver's seat 9C, and starts the gas engine 7. In this state, the hydraulic excavator 1 can be moved forward or backward by operating the operation lever for traveling. Further, the operator can operate the work device 4 and the like to perform earth and sand excavation work and the like by operating the operation lever for work.

Next, an example of replenishment work of LPG as gas fuel will be described. First, the empty gas container 21 attached to the gas container bracket 15 is removed. In this case, after closing the cock 21B, the gas supply pipe 22 is removed from the cock 21B. Also, the nut 19D of the fixing member 19 of the gas container bracket 15 is loosened to release the restraint of the gas container 21 by the belt 19C. When the restraint of the gas container 21 is released, the grip 21C2 of the protector 21C is grasped and the gas container 21 is lifted and removed from the gas container bracket 15.例文帳に追加Alternatively, a wire or hook is hooked on the handle 21C2, and lifted using a crane for removal.

After the empty gas container 21 is removed from the gas container bracket 15, the LPG-filled gas container 21 is placed on the support member 18 of the gas container bracket 15 in a sideways state, and the removal procedure described above is reversed. Thus, the gas container 21 can be attached to the gas container storage chamber 14 . In this operation of attaching and detaching the gas container 21, since the mounting position of the gas container bracket 15 is low and close to the front side of the upper rotating body 3, the gas container 21 can be easily attached and detached.

Thus, according to the present embodiment, the space between the cab 9 provided with the driver's seat 9C located on the left side of the revolving frame 5 and the hydraulic oil tank 10 located on the right side of the revolving frame 5 and storing hydraulic oil is , the gas container storage chamber 14 is opened at the upper side and the front side. A gas container 21 for storing LPG (gas fuel) to be supplied to the gas engine 7 is detachably attached to the gas container storage chamber 14 .

Therefore, the gas container 21 does not collide with surrounding obstacles when the upper swing body 3 swings. Further, since the gas container storage chamber 14 is provided at a low position between the cab 9 and the hydraulic oil, the gas container 21 can be easily replaced without going up to a high position. Moreover, since the gas container storage chamber 14 is provided in a state in which the upper side and the front side are open, the gas container 21 attached to the gas container storage chamber 14 can be grasped and lifted by hand or lifted using a crane. can be Also, the gas container 21 can be lowered from the upper side and attached.

As a result, the gas container 21 can be protected from damage due to collision with surrounding obstacles, and durability can be improved. Moreover, workability when exchanging the gas container 21 can be improved.

The gas container 21 is provided with a cock 21B for adjusting the amount of gas fuel supplied. On top of this, the gas container 21 is attached to the gas container storage chamber 14 with the cock 21B facing the front side of the revolving frame 5. As shown in FIG. As a result, the gas container 21 is laid down with the cock 21B positioned on the front side, so that the gas container 21 can be reliably fixed with a simple structure. Further, the cock 21B located on the front side facilitates connection and disconnection of the gas supply pipe line 22 from the ground, and also facilitates the operation of the cock 21B.

The gas container 21 and the gas engine 7 are connected by a gas supply line 22 for supplying LPG as gas fuel from the gas container 21 to the gas engine 7. The gas supply line 22 contains LPG. is provided with a vaporizer 23 for vaporizing the The vaporizer 23 is arranged on the rear side of the gas engine 7 . Since the gas supply line 22 connected to the vaporizer 23 located on the rear side of the gas engine 7 passes around the gas engine 7, the heat generated by the gas engine 7 can be used to accelerate the vaporization of LPG. . Also, in cold regions, the LPG in the gas supply pipe 22 can be kept warm, and the gas engine 7 can be stably started.

The gas supply line 22 is connected to the vaporizer 23 through the lower side of the gas engine 7 . As a result, the gas supply line 22 can be arranged at a position close to the gas engine 7, so that it is possible to promote the vaporization of LPG and keep the LPG warm.

A gas container bracket 15 is provided on the revolving frame 5 in the gas container storage chamber 14 . The gas container bracket 15 is fixed between a support member 18 extending along the periphery of the gas container 21 and supporting the gas container 21 from below, and the gas container 21 supported on the support member 18 and the support member 18 . and a restricting member 20 restricting the movement of the gas container 21 to the front side of the revolving frame 5 .

Therefore, the support member 18 can support the gas container 21 from below, and the fixing member 19 can fix the gas container 21 supported on the support member 18 between the support member 18 and the support member 18 . In addition, the restricting member 20 can restrict the movement of the gas container 21 fixed on the support member 18 by the fixing member 19 to the front side of the revolving frame 5 . As a result, the gas container 21 can be stably fixed even when working on uneven ground where vibration occurs or on a slope where inclination occurs.

The revolving frame 5 has a left vertical frame portion 5J1 and a right vertical frame portion 5J2 which are positioned below the gas engine 7 and are spaced apart in the left and right directions and extend forward and rearward, and a left vertical frame portion 5J2 which extends in the left and right directions. An engine support frame 5J is provided which consists of a rear vertical frame portion 5J3 connecting the rear end of the vertical frame portion 5J1 and the rear end of the right vertical frame portion 5J2. The gas supply line 22 is connected to the vaporizer 23 from the gas container 21 through the inside of the engine support frame 5J. Since the inner side of the engine support frame 5J is the lower side of the gas engine 7, the LPG flowing through the gas supply pipe 22 can be warmed by the heat generated by the gas engine 7, and the vaporization of the LPG can be promoted. Also, in cold regions, when the vehicle is restarted after being stopped, the LPG kept warm by the heat of the gas engine 7 can be supplied to the gas engine 7, and the sufficiently vaporized LPG can stably start the gas engine 7. be able to.

In addition, in the embodiment, the case where LPG (liquefied petroleum gas) is used as the gas fuel has been described as an example. However, the present invention is not limited to this, and for example, natural gas may be used as gas fuel. In this case, the vaporizer can be omitted.

In the embodiment, the cab 9 having the cab box 9B is described as an example of the building. However, the present invention is not limited to this, and a canopy having a top surface (roof) covering the driver's seat may be applied as the building.

Furthermore, in the embodiment, the hydraulic excavator 1 with a very small rear swing radius is described as an example of the construction machine. However, the present invention is not limited to this, and can be applied to a very small swing type hydraulic excavator, a general hydraulic excavator in which the turning radius of the upper rotating body protrudes from the vehicle width dimension of the lower traveling body, and the like. It can also be applied to construction machines equipped with wheel-type undercarriages.

1 Hydraulic excavator (construction machinery)
2 lower running body 3 upper revolving body 4 work device 5 revolving frame 5J engine support frame 5J1 left vertical frame part 5J2 right vertical frame part 5J3 rear vertical frame part 7 gas engine 9 cab (building)
9C Driver's seat 10 Hydraulic oil tank 14 Gas container storage chamber 15 Gas container bracket 18 Supporting member 19 Fixing member 20 Regulating member 21 Gas container 21B Cock 22 Gas supply pipe 23 Vaporizer

Claims (6)

It comprises a self-propellable undercarriage, an upper swinging body rotatably provided on the lower traveling body, and a work device provided on the front side in the front and rear directions of the upper swinging body,
The upper revolving body is
a revolving frame on which the working device is provided on the front side;
a gas engine provided on the rear side of the revolving frame and using gas fuel as fuel;
A construction machine comprising a gas container for storing gas fuel to be supplied to the gas engine,
a gas supply pipe connecting the gas container and the gas engine and supplying gas fuel from the gas container to the gas engine;
a vaporizer provided in the gas supply pipeline for vaporizing the gas fuel;
The gas container is provided over the front and rear directions of the upper revolving body,
The construction machine, wherein the vaporizer is arranged behind the gas engine. In the construction machine according to claim 1,
The upper rotating body has a gas container storage chamber with an open upper side and a front side,
The construction machine, wherein the gas container is detachably attached to the gas container storage chamber. In the construction machine according to claim 2,
The gas container is provided with a cock for adjusting the amount of gas fuel supplied,
The construction machine according to claim 1, wherein the gas container is attached to the gas container storage chamber with the cock directed toward the front side of the revolving frame. In the construction machine according to claim 1,
The construction machine, wherein the gas supply line is connected to the vaporizer through the underside of the gas engine. In the construction machine according to claim 2,
The gas container storage chamber is provided with a gas container bracket positioned on the revolving frame,
The gas container bracket includes a support member that extends along the periphery of the gas container and supports the gas container from below, and a fixing member that fixes the gas container supported on the support member to the support member. and a restricting member for restricting movement of the gas container to the front side of the revolving frame. In the construction machine according to claim 1,
The revolving frame has a left vertical frame part and a right vertical frame part positioned below the gas engine and extending in the front and rear directions with an interval in the left and right direction, and the left vertical frame part extending in the left and right direction. an engine support frame made up of a rear vertical frame portion connecting the rear end of the frame portion and the rear end of the right vertical frame portion;
The construction machine, wherein the gas supply line is connected to the vaporizer through the inside of the engine support frame from the gas container.

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