JP6119597B2 - Construction machinery - Google Patents

Description

  The present invention relates to a construction machine such as an excavator provided with a scaffold for performing maintenance work on an engine or the like in front of an engine room.

  The background art will be described using an excavator as an example.

  As shown in FIGS. 9 and 10, the excavator has an upper swing body 2 mounted on a crawler-type lower traveling body 1 so as to be rotatable about an axis perpendicular to the ground. A work attachment 9 provided with a boom 3, an arm 4, a bucket 5, and hydraulic cylinders (boom, arm, and bucket cylinders) 6, 7, and 8 for operating them is mounted on the part.

  The upper swing body 2 is configured by providing various devices and equipment on an upper frame 10 as a base.

  That is, an engine room 12 whose upper surface is opened and closed by a bonnet 11 is provided at the rear part of the upper frame. The engine room 12 includes an engine 13 as a power source and related equipment (a radiator 14, a cooling fan 15, a hydraulic pump 16). Etc.) are installed.

  On the other hand, in front of the engine room 12, a cabin 17 is installed on one of the left and right sides (usually on the left side, which will be described below in this case).

  In this specification, “front and rear” and “left and right” refer to the directionality seen from the operator seated in the cabin 17, and “left and right direction” means the upper frame width direction.

  On the opposite side (right side) of the upper frame 10 to the cabin 17, in front of the engine room 12, a hydraulic oil tank 18 that stores hydraulic oil and a fuel tank 19 that stores fuel are juxtaposed in front and rear as illustrated. (Hereinafter, it will be described in this case, but it may be arranged side by side).

  Further, a scaffold 20 for performing maintenance of the engine room and other equipment in the engine room including the engine 13 is provided in the middle of the upper frame width direction immediately before the engine room 12, and in front of the hydraulic oil tank 18, A maintenance passage P <b> 1 leading to the scaffold 20 is provided to guide the maintenance worker to the scaffold 20.

  In FIG. 10, reference numeral 21 denotes an air cleaner installed between the engine room 12 and the cabin 17 on the left side of the upper frame.

  The maintenance passage P1 is composed of a step plate 22 provided at the front end portion of the upper frame and one or a plurality of steps (two steps are illustrated in the figure, which will be described below). Has been.

  Both raising / lowering steps 23 and 24 are normally formed using the upper surface of mounting equipment. For example, the first step elevating step 23 is formed by the upper surface cover of the tool box 25, and the second step elevating step 24 is formed by the upper surface of the fuel tank 19 or its upper surface cover.

  Excavators equipped with such a scaffold 20 and maintenance passage P1 are disclosed in Patent Documents 1 to 3.

  Further, as shown in Patent Document 1, a handrail for assisting raising and lowering is provided on the outer edge of the passage along the maintenance passage P1.

  In this known technique, the second stage lifting step 24, which is the uppermost stage, and the scaffold 20 are set to be flush with each other, while the handrail is a lower handrail for the first stage lifting step and an upper part for the second stage lifting step. The upper handrail is attached to the upper surface of the second step elevating step with a sufficient height so as to have a safety fence function for preventing the worker from falling.

JP 2010-150835 A JP 2010-47975 A Japanese Patent No. 5106711

  According to the above known technique, since the upper handrail is configured to perform the safety fence function alone, it is necessary to secure a height and strength sufficient for the handrail to perform the safety fence function.

  For this reason, the equipment cost for the upper handrail is high, and the handrail becomes heavy and installation is troublesome.

  If the upper handrail is dedicated to the handrail and its height and strength are reduced, the structure can be simplified and the weight can be reduced, but this will significantly reduce the safety fence function and reduce the safety during maintenance work. At the same time, the feeling of security given to the workers is reduced and workability is also deteriorated.

  Therefore, the present invention provides a construction machine that can easily construct a sufficient safety fence function at low cost.

As means for solving the above-mentioned problems, in the present invention, an upper swing body is rotatably mounted on a lower traveling body, and an engine and related devices are accommodated in a rear portion of an upper frame that serves as a base of the upper swing body. The engine room is provided with a cabin at the front part on the left and right sides, while a scaffold for maintenance work is provided immediately before the engine room and in the central part in the upper frame width direction, and hydraulic oil In a construction machine comprising a hydraulic oil tank for storing fuel and a fuel tank for storing fuel, at least one of the hydraulic oil tank and the fuel tank is used as a fence-use tank at the end of the scaffold in the upper frame width direction. close to a scaffold end, and provided in a state where the tank top is protruded above the scaffold top surface, on the tank of the shelf serves tank Has an inner surface located on the scaffold end facing the interior of the upper frame width direction so as to face the above scaffold, the scaffold handrail on the inner surface, mounted in a state of protruding into the tank upwardly, the On the side of the upper frame opposite to the cabin, a rear-up maintenance passage for guiding maintenance workers from the front ground to the scaffolding is provided, and the fence / tank is connected to the maintenance passage on the side of the maintenance passage. Provided adjacent to the rear end of the rear end, provided with a handrail for the passage at the outer edge of the maintenance passage, the scaffold handrail is formed in a generally inverted U shape having a pair of lower ends and an upper side, a pair of lower end is attached to the inner surface of the tank top of the fence serves tank, internal the upper portion toward the rear in plan view As arranged in Ritonaru inclined line, above the position of the shelf serves tank, the front portion of the scaffold for a handrail is attached to the inner side surface and the inner surface of the tank top of the shelf serves tank It protrudes to the outer edge side of the upper frame from the pair of lower ends .

  According to this structure, a safety fence function can be exhibited by the upper part of the fence-cum-use tank protruding upward from the upper surface of the scaffold on the side of the scaffold and the scaffolding handrail attached thereto.

  In other words, part of the tank can be used as part of the fence. For this reason, the handrail itself can be short and light, and a strong tank can ensure sufficient strength as a whole fence.

  Thereby, the safety fence function can be easily constructed at low cost.

  In this case, the fence with the tank and handrail is built up from the end of the scaffold to the side of the scaffold, so the safety fence function is high, and safety during maintenance work can be enhanced, and the worker feels secure To improve workability.

  In addition, since the handrail serves as a mark for the end of the scaffold and the position of the end of the scaffold can be seen at a glance, it is easy for the worker to locate the position during maintenance work, which also helps improve safety and workability.

  From the above points, a sufficient safety fence function can be easily obtained at low cost by a short and light handrail.

In the present invention , as described above, on the side of the upper frame that is opposite to the cabin, a rearward maintenance passage that guides a maintenance worker from the front ground to the scaffolding is provided, and the fence combined tank is provided with the maintenance tank. at the side of the aisle, Ru provided adjacent to the rear of the rear end portion of the maintenance channel.

  According to this configuration, the scaffolding handrail is positioned behind the rear end of the maintenance passage, that is, the end of the scaffolding, that is, the position that requires the most handrail when transferring from the maintenance passage to the scaffolding or vice versa, and is easy to grasp. Because of its position, it is possible to increase the safety of transfer.

In this case, the hydraulic oil and fuel tanks are placed on the left and right sides of the upper frame in front of the engine room.
(i) The inner surfaces of each other face each other,
(ii) The tank on the maintenance passage side is located near the end of one scaffold as the tank serving as a fence and the tank on the opposite side is arranged in a state close to the end of the other scaffold, and the scaffold is placed between the two tanks. the is not the desire of providing.

  If it carries out like this, it will become possible to take the center space, ie, the width dimension of a scaffold, wide by distributing and installing two tanks which are large-sized facilities on both the left and right sides of the upper frame. For this reason, the safety and workability of the maintenance work can be further enhanced.

  Moreover, since both tanks can be used as a scaffold mounting member, the scaffold mounting structure is simplified.

Upper SL hydraulic oil, the opposite side of the tank and the fence serves tank of fuel both tanks, tank top has to desired to dispose in a state of protruding above the scaffold top.

  In this way, both tanks project upward from the scaffold to form the left and right side walls of the scaffold, and the scaffold is formed as a recess, giving the worker a sense of security and contributing to improved workability.

Innermost edge of the upper frame width direction of the rear end portion of the upper Symbol maintenance passage, the provision of the maintenance passage and anchorage in a state positioned inside the upper frame width direction than anchorage end of the maintenance aisle side of the scaffold Accordingly, we were desired between a portion of the maintenance channel and scaffold is to form a shift section arranged in the longitudinal direction of the straight line.

  By doing so, since the rear end portion of the maintenance passage and the scaffold can be connected in the front-rear direction, there is no need to take an irregular movement of moving diagonally or laterally at the transfer portion as in the case where there is no such connection.

  In addition, the worker can easily grip the scaffolding handrail at the transfer portion.

  With these points, the safety of transfer is further increased.

The rear end of the passage for the hand rail have to desirable attach to the front of the fence serves tank.

  In this way, by attaching both handrails to a common member called a fence-use tank, the gap (joint) between both handrails is reduced and the continuity of both handrails is maintained, thus increasing the safety of lifting. be able to.

  According to the present invention, a sufficient safety fence function can be easily constructed at low cost.

It is a perspective view of the upper revolving structure of the shovel concerning a 1st embodiment of the present invention. FIG. It is the III-III sectional view taken on the line of FIG. It is the IV-IV sectional view taken on the line of FIG. It is an enlarged view of the scaffold part of FIG. It is an enlarged view of the scaffold part of FIG. It is a perspective view of the upper revolving structure of the shovel concerning a 2nd embodiment of the present invention. FIG. It is a schematic side view which shows the shovel which is the application object of this invention, and a prior art. FIG.

  An embodiment of the present invention will be described with reference to FIGS.

  The embodiment is applied to an excavator.

  In the first embodiment shown in FIGS. 1 to 6 and the second embodiment shown in FIGS. 7 and 8, the following points are the same as those of the prior art shown in FIGS.

  (A) The upper turning body 2 is mounted on the lower traveling body so as to be turnable about an axis perpendicular to the ground.

  (B) The upper revolving unit 2 is configured by providing various devices and equipment on an upper frame 10 as a base.

  (C) An engine room 12 that is opened and closed by a bonnet 11 is provided at the rear part of the upper frame 10, and an engine 13 as a power source and related equipment (a radiator 14, a cooling fan 15, a hydraulic pump 16) are provided in the engine room 12. Etc.) is installed.

  (D) The cabin 17 is installed on the left side in front of the engine room 12.

  (E) On the opposite side (right side) of the upper frame 10 to the cabin 17, a hydraulic oil tank 18 that stores hydraulic oil is installed in front of the engine room 12.

  In FIGS. 1 and 7, the cabin 17 is indicated by a virtual line for convenience.

1st Embodiment (refer FIGS. 1-6)
A fuel tank 19 for storing fuel is installed behind the cabin 17 in the upper frame 10 (between the cabin 17 and the engine room 12), and an air cleaner 21 for filtering engine intake air is disposed on the fuel tank 19. .

  In other words, the hydraulic oil and fuel tanks 18 and 19 that are arranged side by side on the right side of the upper frame in the prior art shown in FIGS. 9 and 10 are arranged on the left and right sides of the upper frame 10 in the embodiment. Are arranged in a state of being opposed to each other, and the fuel tank 19 and the air cleaner 21 are three-dimensionally arranged.

  As a result, an empty space for the fuel tank is created in front of the hydraulic oil tank 18, that is, below a maintenance passage P2, which will be described later, and other equipment added here, for example, a liquid reductant tank or a hybrid machine The battery or both of them can be installed.

  In addition, since a space in the front-rear direction is created on the right side of the upper frame, the plane shape of the hydraulic oil tank 18 is a rectangle whose left-right dimension is smaller than the front-rear dimension as shown in FIG. It becomes possible to install in.

  This makes it possible to widen the space between both tanks 18 and 19.

  In the space between the tanks 18 and 19, a device requiring maintenance, for example, a control valve 26 (see FIGS. 3 and 4) is installed, and an engine room device including the engine 13 and the control valve 26 are installed. A scaffold 27 for performing maintenance is provided between the hydraulic oil and fuel tanks 18 and 19 in a state of covering the control valve 26 from above immediately before the engine room 12.

  Here, as shown in FIGS. 1, 3, and 4, the tanks 18 and 19 are provided such that the upper part of the tank protrudes above the upper surface of the scaffold 27. In other words, the height position of the scaffold 27 and the height dimensions of both tanks 18 and 19 are set so as to be in this state.

  On the other hand, a maintenance passage P <b> 2 leading to the scaffold 27 is provided in front of the hydraulic oil tank 18 to guide the maintenance worker to the scaffold 27.

  The maintenance passage P2 is composed of a step board 28 provided at the front end portion of the upper frame and lifting steps 29 and 30 of one to a plurality of stages (two stages are illustrated in the figure, which will be described below). Has been.

  The first step elevating step 29 is formed by inclining the upper surface lid of the tool box 31 forward and lowering its middle part.

  On the other hand, the second step 30 is formed by an upper surface cover 32 that covers the upper surface of a device (not shown, for example, a liquid reducing agent tank) installed behind the tool box 31.

  The handrail and the scaffold structure will be described in detail.

  A passage handrail 33 is provided along the maintenance passage P2 at the outer edge of the maintenance passage P2.

  The passage handrail 33 is disposed at a height that is easy for an operator to grasp, and the front end is attached to the front end portion of the upper frame and the rear end is attached to the front end portion of the upper surface of the hydraulic oil tank 18 (or the front surface). .

  Further, behind the passage handrail 33, the scaffolding handrail 34 is provided above the tank upper surface of the hydraulic oil tank 18 serving as a fence-cum-use tank that projects from the upper surface of the scaffold. .

  The scaffolding handrail 34 is generally formed in an inverted U-shape, and the lower end is attached to the inner surface of the upper part of the tank with the upper side being substantially the same height as the passage handrail 33.

  Further, as shown in FIG. 2, the rear portion of the passage handrail 33 and the scaffolding handrail 34 are arranged on an inclined line that is inward toward the rear in a plan view.

  As a result, the handrails 33 and 34 are positioned along the scaffold 27 from the maintenance passage P2 and the transfer route opposite thereto, and the continuity thereof is ensured.

  The scaffold 27 is partially detachable to facilitate maintenance of the control valve 26 installed below.

  That is, the scaffold 27 is configured by arranging the first scaffold body 35 on the front side and the second scaffold body 36 on the rear side that covers the upper space (maintenance space) of the control valve 26. The two scaffolds 36 are removed and the upper space is opened.

  Both scaffolds 35 and 36 are formed in a corrugated plate shape in which substantially trapezoidal convex portions and concave portions are alternately arranged in the front-rear direction as shown in FIGS. 4 and 6, and as shown in FIGS. Both ends of each of the tank brackets 18 and 19 are attached to scaffold brackets 37 and 37 attached to inner surfaces facing each other with bolts and nuts, for example.

  In order to facilitate the detachment of the second scaffold body 36 and to ensure the continuity of the two scaffold bodies 35, 36, the rear end portion of the first scaffold body 35 and the front end portion of the second scaffold body 36 are connected to the latter. The overlapping portions are connected to each other at a plurality of left and right positions so as to be detachable by bolts and nuts, for example.

  In this state where the scaffold is attached, both ends of the scaffold 27 (both scaffold bodies 35, 36) are close to the inner side surfaces of both tanks 18, 19, and the scaffold 27 is formed as a recess sandwiched between both tanks 18, 19.

  In FIG. 5, 37 a is a boss for attaching the scaffold bracket 37 to the inner surface of the tank, and in FIG. 6, 38 is a partition wall that partitions the front side of the engine room 12.

Here, the maintenance passage P2 is
(I) As shown in FIG. 2, the innermost end in the upper frame width direction at the rear end of the passage (the left end of the second step elevating step 30; the end of the passage) is the end of the scaffold 27 on the maintenance passage side (scaffold) 27, located on the inner side in the upper frame width direction than the scaffold end)
(II) The rear end of the passage is provided in front of the scaffold 27 and adjacent to the scaffold 27 in a substantially flush state.

  In other words, in response to the fact that the space between the two tanks 18 and 19 can be widened based on the left and right distribution arrangement of the hydraulic oil and fuel tanks 18 and 19 as described above, the passage end and the scaffold of the above (I) The end position can be actually set.

  The “substantially flush state” includes not only a completely flush state but also a state having a slight level difference that does not hinder movement.

  Further, “adjacent” means both a state in which there is no gap and a state in which a slight seam that does not affect movement appears.

  Thus, a transfer portion (a hatched portion in FIG. 2) S in which the rear end portion of the maintenance passage P2 and a part of the scaffold 27 are continuously arranged on a straight line in the front-rear direction is formed.

  In order to avoid complication of the figure, the symbol “S” of the transfer part is attached only to FIG.

  According to the above configuration, the following effects can be obtained.

  1) The safety fence function can be exhibited by the upper part of the hydraulic oil tank 18 protruding upward from the upper surface of the scaffold 27 on the side of the scaffold 27 and the scaffolding handrail 34 attached to the hydraulic oil tank 18.

  In other words, a part of the hydraulic oil tank 18 can be used as a part of the fence. For this reason, the hand rail 34 itself can be short and light, and the sturdy hydraulic oil tank 18 can ensure sufficient strength as the entire fence.

  Thereby, the safety fence function can be easily constructed at low cost.

  2) Since the fence made of the hydraulic oil tank 18 and the scaffolding handrail 34 stands on the side of the scaffolding 27 and is constructed from the edge of the scaffolding, the safety during maintenance work can be improved and the worker can feel at ease. To improve workability.

  3) The scaffolding handrail 34 serves as a mark on the right side of the scaffolding, so that the position of the scaffolding edge can be seen at a glance, making it easier for workers to position during maintenance work, which also helps improve safety and workability. .

  4) Since the hydraulic oil tank 18 serving as a fence combined tank is provided adjacent to the rear end of the rear end of the maintenance passage P2 on the right side where the maintenance passage P2 is provided, the scaffolding handrail 34 is provided with the maintenance passage. Behind the rear end, the position of the scaffolding end, that is, the position that requires the most handrail when transferring from the maintenance passage P2 to the scaffold 27 or vice versa, and is in the position where it is easy to grip, thus improving the safety of the transfer. be able to.

  5) The hydraulic oil and fuel tanks 18 and 19 which are large-sized facilities are arranged separately on the left and right sides of the upper frame, so that the central space, that is, the width of the scaffold 27 can be widened. For this reason, the safety and workability of the maintenance work can be further enhanced.

  Moreover, since both tanks can be used as a scaffold mounting member, the scaffold mounting structure is simplified.

  6) Not only the hydraulic oil tank 18 but also the fuel tank 19 protrudes above the scaffold to form the left and right side walls of the scaffold 27, and the scaffold 27 is formed as a recess, which gives the worker a sense of security and contributes to improved workability. To do.

  7) Since the transfer portion S arranged on the straight line in the front-rear direction is formed at the connection between the maintenance passage P2 and the scaffold 27, the transfer portion may move diagonally or laterally in the case where there is no connection in the front-rear direction. There is no need to take regular moves.

  Further, the transfer portion S makes it easier for the operator to grip the scaffolding handrail 34.

  With these points, the safety of transfer is further increased.

  8) Since the rear end portion of the passage handrail 33 is attached to the front portion of the hydraulic oil tank 18, in other words, both the passage and scaffolding handrails 33 and 34 are attached to a common member called the hydraulic oil tank 18. As a result, the gap (seam) between the handrails 33 and 34 is reduced, and the continuity of both handrails is maintained. For this reason, raising / lowering safety | security can be improved.

Second embodiment (see FIGS. 7 and 8)
Only differences from the first embodiment will be described.

  In the second embodiment, as a passage configuration when there is no additional equipment such as the liquid reductant tank of the first embodiment, the maintenance passage P2 is in a state where the second step elevating step 30 of the first embodiment is not present, that is, The step plate 28 and the one-step lifting / lowering step (first step lifting / lowering step of the first embodiment) 29 are configured.

  Also in the second embodiment, the scaffold end is provided on the right side of the passage end (the left end of the lifting step 29), and the upper end portion of the maintenance passage P2, that is, the lifting step 29 and a part of the scaffold 27 are mutually connected. Are formed on a straight line in the front-rear direction (a hatched portion in FIG. 8) S.

  However, according to this configuration, unlike the first embodiment, the elevating step 29 itself and the scaffold 27 are not directly continuous, and the continuity of the transfer portion S is maintained via the upper end portion of the tool box. .

  In this embodiment, in consideration of the fact that the width of the transfer portion S is narrower than that of the first embodiment, an auxiliary step 39 is provided at the front right side of the scaffold 27, that is, the upper end portion of the passage, that is, the left side of the rear end portion of the tool box 31. It is provided in the shape of a bowl in the vicinity of the scaffold 27.

  Thereby, the transfer portion S can be substantially widened in the auxiliary step 39, and the safety of the transfer can be improved.

  In addition, in 2nd Embodiment, the handrail 40 for scaffolds is provided also on the left side of the scaffold, and the safety fence function is constructed | assembled.

  The scaffolding handrail 40 is formed in a generally inverted U shape, like the right scaffolding handrail 34, and has a lower end attached to the inner surface of the tank in a state of protruding upward from the upper surface of the fuel tank 19. ing.

  In this way, the safety fence function can be obtained on both the left and right sides of the scaffold 27, so that the safety and workability of the maintenance work can be further improved.

  This configuration can be similarly applied to the first embodiment.

Other embodiments
(1) In both the above embodiments, the maintenance passage P2 is configured as a staircase, but may be configured by a slope or a combination of a slope and a staircase.

  (2) In both the above embodiments, the hydraulic oil tank 18 is installed on the side of the maintenance passage P2, but conversely, the fuel tank 19 is installed on the side of the passage and the hydraulic oil tank 18 is installed on each side of the cabin. May be.

  In this case, at least the fuel tank 19 may be used as a fence tank, and a scaffolding handrail may be attached to the upper inner surface of the tank 19 to construct a safety fence function.

  (3) The present invention is not limited to shovels, and can be widely applied to other construction machines provided with a scaffold and a maintenance passage for guiding a maintenance worker to the scaffold.

DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving body 12 Engine room 13 Engine 17 Cabin 18 Hydraulic oil tank as a fence combined tank 19 Fuel tank 27 Scaffolding P2 Maintenance passage 28 Tread plate constituting the maintenance passage 29 Second step elevating step S Transfer portion 33 Handrail for passage 34 Handrail for scaffold 35, 36 First and second scaffolds constituting the scaffold

Claims (5)

An upper revolving unit is pivotably mounted on the lower traveling unit. The engine room that houses the engine and related equipment is located in the rear part of the upper frame that forms the base of the upper revolving unit. Are provided immediately before the engine room and in the center in the width direction of the upper frame. A hydraulic oil tank for storing hydraulic oil and a fuel for storing fuel are also provided. In a construction machine equipped with a tank,
At least one of the hydraulic oil tank and the fuel tank is used as a fence-use tank, close to the scaffold end, which is the upper frame width direction end of the scaffold, and the upper part of the tank projects above the scaffold upper surface. Provided in the state,
Tank upper portion of the shelf serves tank has an inner surface located on the scaffold end facing the interior of the upper frame width direction so as to face the above scaffold, the scaffold handrail on the inner surface, the tank upper Install in a protruding state,
A rear-up maintenance passage for guiding maintenance workers from the front ground to the scaffolding is provided on the side of the upper frame opposite to the cabin. Provided adjacent to the rear of the rear end,
A handrail for passage is provided at the outer edge of the maintenance passage,
The scaffold handrail is formed in a generally inverted U shape having a pair of lower end portions and an upper side portion, and the pair of lower end portions are attached to the inner side surface of the tank upper portion of the fence / tank, and the upper side portion Is arranged on an inclined line that is inward toward the rear in a plan view, the front part of the handrail for scaffolding is located above the tank upper part of the shelf-use tank at a position above the shelf-use tank. A construction machine characterized in that it projects to the outer edge side of the upper frame from the inner side surface and the pair of lower end portions attached to the inner side surface. The hydraulic oil and fuel tanks are placed on the left and right sides of the upper frame in front of the engine room.
(i) The inner surfaces of each other face each other,
(ii) The tank on the maintenance passage side is located near the end of one scaffold as the tank serving as a fence and the tank on the opposite side is arranged in a state close to the end of the other scaffold, and the scaffold is placed between the two tanks. The construction machine according to claim 1, wherein:   3. The construction machine according to claim 2, wherein a tank on the opposite side of the tank for both the hydraulic oil and the fuel is provided in a state where the upper part of the tank projects upward from the upper surface of the scaffold.   By providing the maintenance passage and the scaffold in a state where the innermost end in the upper frame width direction at the rear end portion of the maintenance passage is located on the inner side in the upper frame width direction than the scaffold end on the maintenance passage side of the scaffold The construction machine according to any one of claims 1 to 3, wherein a part of the maintenance passage and the scaffold is formed on a straight line in the front-rear direction.   The construction machine according to any one of claims 1 to 4, wherein a rear end portion of the handrail for the passage is attached to a front portion of the fence / tank.

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