JP7219155B2 - construction machinery - Google Patents

Description

TECHNICAL FIELD The present invention relates to a construction machine, and more particularly to a construction machine having a power unit for operating various hydraulic devices with hydraulic pressure generated by driving a hydraulic pump.

In construction machinery such as large pile drivers and crawler cranes, working devices such as a gantry and winch are installed in the center of the upper rotating body in the width direction, and engines and hydraulic pumps are installed on both sides of the upper rotating body. It is equipped with a house (storage room) that houses various equipment such as the power unit and control equipment that constitute the main elements. For this reason, for example, in the case of a pile driver, a worker can go up to the upper surface of the house to perform maintenance of various devices in a work posture with the leader upright, or a backstay in a transport posture with the leader laid down in the horizontal direction. The upper surface of the house is formed in a flat deck shape so as to secure a movable area of the housing (see, for example, Patent Document 1).

In general, a so-called tandem type swash plate type hydraulic pump, in which a plurality of hydraulic pumps are connected to the engine in a cantilever manner, is mainly used for the hydraulic pump device that constitutes the power unit. Various devices such as hydraulic motors and hydraulic cylinders are operated by the hydraulic pressure generated by the hydraulic pump device. Therefore, in order to prevent the strength of the heavy hydraulic pump unit (engine block) from decreasing, the free end side of the hydraulic pump unit is supported by a suspending body that hangs down from the top plate of the house. Therefore, a support structure for a hydraulic pump has been proposed that can satisfactorily alleviate the load acting on the mounting portion (see, for example, Patent Document 2).

Japanese Unexamined Patent Application Publication No. 2014-118763 (Figs. 1 and 2) JP 2019-49112 A

In recent years, construction machines equipped with diesel engines have been equipped with exhaust gas purifiers in their exhaust systems, and in order to comply with higher exhaust gas regulations, it is required to be able to purify CO, NOx, etc. in the exhaust gas to a high degree. ing. This type of exhaust gas purifier includes, for example, a selective catalytic reduction (SCR) device using urea water as a reducing agent. For this reason, construction machinery equipped with a power unit tends to increase the number of various parts in line with stricter exhaust gas regulations, and there is a problem that design restrictions are more likely to be imposed on the layout in the house than before. rice field. In addition, due to the structure of the power unit, the engine is fixed to the floor frame, while the exhaust pipe and many of the auxiliary equipment are fixed to the house side. It was also a factor.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a construction machine having a power unit installation structure capable of improving mountability in a limited space of a vehicle body.

In order to achieve the above object, the construction machine of the present invention comprises: a lower traveling body having crawlers; and a work device provided in the front part of the work device so as to be able to move up and down. A driver's cab where an operation to drive the device is performed, a power unit provided on the vehicle body frame on the other side in the vehicle width direction to generate a driving force for the working device, the power unit and a plurality of related devices attached thereto. wherein one of the plurality of related devices is an exhaust gas purifying device, and the exhaust gas purifying device is attached to a tower-shaped pedestal installed on the machine frame. The house has a top plate and a box-like shape having an opening at the bottom through which the exhaust gas purifying device can be taken in and out integrally by a hanging operation, and is detachably attached to the body frame. It is characterized by

The power unit includes an engine mounted on the body frame, and a hydraulic pump device cantilevered on the rear side of the engine opposite to the side where the cooling fan exists. and one of the plurality of related devices is a pump support that supports the hydraulic pump device attached to the engine, and the pump support hangs down from the top of the pedestal to support the hydraulic pump. It is characterized in that it is formed so as to be able to support the free end side of the device and that it has an elastic body that can be elastically displaced in the vertical direction.

Further, the exhaust gas purifying device is located at a position lower than the upper end position of the mounting frame, and the house is attached to the body frame so that the top plate prevents movement between the front and rear parts of the upper revolving body. It is characterized by being a scaffolding that makes it possible.

The construction machine is a pile driver having a leader that can be raised and lowered at the front of the upper revolving body, and a back stay that supports the leader from behind. The auger is provided so as to be able to move up and down along the auger, and is characterized in that it is configured to generate driving force for a winch device for lifting and lowering the auger by operating the power unit.

According to the present invention, the exhaust gas purifying device is attached to the frame installed on the body frame, and the box-shaped house is formed with an opening at the bottom thereof through which the exhaust gas purifying device can be taken in and out integrally by a hanging operation. Therefore, it is possible to support related equipment attached to the power unit, such as an exhaust gas purifying device, on the body frame side in the same manner as the engine. As a result, assembly defects in the exhaust system due to manufacturing errors can be eliminated, and the power unit can be easily and quickly installed on the body frame. That is, it is possible to obtain a power unit installation structure capable of improving mountability in a limited space of the vehicle body.

In addition, at the design stage, the turret-like frame can be framed with shaped steel, making it easy to add parts and add parts mounting holes, ensuring compatibility with existing products even if specifications change. It becomes possible to In other words, even if the number of various parts increases due to stricter exhaust gas regulations, it is less likely to be subject to restrictions in terms of layout within the house, and a degree of freedom in design can be provided. Furthermore, at the manufacturing stage, after the power unit has been sub-assembled on the aircraft frame to a near-complete state, the house can be assembled by simply covering it with the house suspended by a crane, reducing lead time and improving productivity. can be improved. Also, in maintenance, the amount of work required to attach and detach the house can be reduced, and in particular, in a situation where large-scale work such as engine replacement is required, the effect can be obtained remarkably.

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view of the pile driver which shows the example of one form of this invention. It is also a side view of the base machine. It is also a plan view of the base machine. It is also a front view of the base machine. Similarly, it is a side view of a main part of the power unit. It is a plan view of the main part of the same. It is a principal part side view of the exhaust gas purification apparatus similarly supported by the mount. It is a plan view of the main part of the same. Similarly, it is a principal part rear view. FIG. 8 is a cross-sectional view taken along the line XX of FIG. 7; 6 is a cross-sectional view taken along line XI-XI of FIG. 5; FIG. Similarly, it is a perspective view of a pump support.

1 to 12 show the application of the present invention to a pile driver, which is one type of construction machinery. As shown in FIG. A base machine comprising an upper revolving body 14 which is rotatably provided on the upper portion of the lower traveling body 12 via a revolving bearing 13, and a base machine which is provided at the front portion of the upper revolving body 14 so as to be swingable in the front-rear direction. A leader arm 15, a leader 16 provided at the tip of the leader arm 15 so as to be able to rise and fall in the front-rear direction, and a pair of left and right backstays 17 supporting the leader 16 erected in a working posture from the rear side of the upper revolving body 14. , 17, and a rear support cylinder 18 for supporting the leader 16 laid down rearward in the transportation posture from below on the rear side of the upper rotating body 14. - 特許庁A counterweight 19 for stability is mounted on the rear end of the upper swing body 14 .

On the front side of the leader 16, a pair of left and right guide pipes 20, 20 provided parallel to the longitudinal direction of the leader 16, and the outer surfaces of the guide pipes 20, 20 in the width direction of the vehicle body are slidably held. An auger 22, which is one of working devices, is provided so as to be able to move up and down along the front surface of the leader 16 via a plurality of guide gibs 21. As shown in FIG. In the working posture (FIG. 1) in which the leader 16 is vertically erected, the auger 22 grips a construction member such as a steel pipe pile or a screw rod 23, and rotates them to bury them in the ground. Piling work will be carried out. On the other hand, in the transportation posture (not shown) in which the leader 16 is laid down horizontally, the reduced backstay cylinder 17a and the rear support cylinder 18 are laid down on the upper revolving body 14 together with the leader 16 whose upper side is cut off. It is designed to be mounted on the carrier of a transport vehicle in its original state.

As shown in FIGS. 2 to 4, the upper revolving body 14 comprises a main frame 24 to which the revolving bearing 13 is attached, and floor frames 25 and 26 provided on both sides of the main frame 24 in the vehicle width direction. A frame is provided, and the various large parts described above are mainly mounted on the main frame 24 . The main frame 24 has a pair of left and right front jacks 27, 27 at its front end, and a pair of left and right rear jacks 28, 28 at its rear end. In the front part of the floor frame 26 on the right side, an operator's cab 29 for operating the auger 22, the upper revolving body 14, the lower traveling body 12, etc. is installed. , a winch mounting portion 30 is provided, and a plurality of winch devices such as, for example, a winch device for lifting and lowering an auger are mounted. A rope (not shown) from an auger lifting winch device is connected to the auger 22 via a top sheave block 31 provided at the top of the leader 16 (FIG. 1), and the auger 22 is lifted and lowered by performing a winch operation. can be made

Further, at the rear portion of the floor frame 26 on the right side, an equipment storage house 34 for storing hydraulic equipment such as a hydraulic oil tank 32 and a hydraulic motor 33 is provided. On the other hand, on the left floor frame 25, a power unit 36, which will be described later, as a hydraulic power unit for supplying pressure oil by being driven by a diesel engine (hereinafter referred to as engine), and a plurality of related devices attached thereto. An engine housing house 35 for housing an exhaust gas purifier 37, which is one of them, is provided. Each of the houses 34 and 35 has a substantially rectangular box shape extending in the front-rear direction, and has top plates 34a and 35a that occupy a wide flat surface on which people can walk. It is formed in a shape that has an opening into which various devices such as the above can be taken in and out integrally, in other words, it does not have a bottom plate. The housings 34 and 35 can be attached to and detached from the corresponding floor frames 25 and 26 by bolting the flanges formed by bending the edges of the openings. In addition, a plurality of inspection doors 35b (the opposite side is not shown) are provided on the sides of each of the houses 34 and 35, respectively.

As shown in FIGS. 5 and 6, the power unit 36 has an engine 38 mounted on the floor frame 25 in an anti-vibration state, and on the rear side of the engine 38 opposite to the side where the cooling fan 38a exists. and a hydraulic pump device 39 mounted in a cantilevered manner. Further, on the front side of the engine 38 on the floor frame 25, that is, on the upstream side in the flow direction of the cooling air from the cooling fan 38a, there is a radiator as one of the heat exchange devices arranged facing the cooling fan 38a. 38b is provided. Further, a heat exchanger upstream chamber 35c is provided on the front side of the engine storage house 35 and upstream of the radiator 38b. A reducing agent tank (urea water tank) 37a storing urea water as a liquid reducing agent for reducing NOx to be supplied to the exhaust path is positioned side by side in the front-rear direction, and is provided on the floor frame 25. .

An air cleaner 38e installed on a top plate 35a of an engine storage house 35 is connected to an intake pipe 38d extending upward from a side portion of the engine 38, and fresh air (external air) sucked by the air cleaner 38e is supplied to the engine. It is possible to supply to each of the 38 cylinders. On the other hand, an exhaust pipe 38g extending rearward from the rear end side portion of the engine 38 through an upward bellows pipe 38f is provided with an exhaust gas purifying device 37 that complies with advanced exhaust gas regulations.

The exhaust gas purifying device 37 is arranged upstream of the selective reduction catalyst (SCR) 37b using urea water as a reducing agent and the SCR 37b of the exhaust pipe 38g, and supplies the urea water from the urea water tank 37a. It has an injection nozzle 37c for receiving and injecting the urea water toward the exhaust gas in the exhaust pipe 38g. As a result, the exhaust gas after combustion is purified by the exhaust gas purification device 37 and then discharged to the outside through the exhaust port 38h. Specifically, when the urea water is injected, the decomposition reaction of the urea water in a high-temperature atmosphere produces ammonia, and NOx in the exhaust gas is reduced by the ammonia to be decomposed into water and nitrogen. ing.

The exhaust pipe 38g, the exhaust port 38h, the SCR 37b, and the like, which constitute the exhaust path, are stably attached to a frame 40 installed on the floor frame 25. As shown in FIG. As shown in FIGS. 7 to 10, the pedestal 40 is made of a steel material having a U-shaped or L-shaped cross section to increase its rigidity. front pillars 40a, 40a and rear pillars 40b, 40b, a horizontal beam 40c spanning between the upper ends of the front pillars 40a, 40a, and parallel between the upper ends of the left and right pair of rear pillars 40b, 40b and the horizontal beam 40c The lower ends of the pedestals 40a and 40b are bolted to the floor frame 25 to straddle the hydraulic pump device 39. and is sized to fit within the engine storage house 35 as a whole. A plurality of brackets 40e for supporting the exhaust pipe 38g are provided at regular intervals on each of the pedestals 40a and 40b and the vertical beam 40d, and various accessories such as sensors and filters are attached. Various sizes of brackets are provided.

Further, it has an angle member 40f that extends between the rear surfaces of the pair of left and right rear legs 40b, 40b at an intermediate position in the height direction, and has a length corresponding to the height position of the angle member 40f, A main body (cylindrical body) of the SCR 37b is supported by a pair of left and right strut members 40g, 40g whose lower ends are bolted to the floor frame 25. As shown in FIG. A pair of left and right stay members 40h, 40h are attached to the upper rear surfaces of the rear pillars 40b, 40b in a state in which the SCR 37b is supported. It is fixed on the stay members 40h, 40h with letter-shaped bolts 41. As shown in FIG. In this way, the SCR 37b constituting the exhaust gas purification device 37 is arranged at a position lower than the vertical beam 40d which is the upper end position of the frame 40, and the gap in the height direction between the top plate 35a of the engine storage house 35 and the vertical beam 40d is is kept small.

By the way, the hydraulic pump device 39 provided in this type of pile driver 11 is a so-called tandem type hydraulic pump in which a first hydraulic pump 39a and a second hydraulic pump 39b, which are variable displacement swash plate hydraulic pumps, are connected in series. A plurality of gear pumps 39c are added to the pump device, and a flange 39d provided at the front end of the first hydraulic pump 39a is bolted to the engine block. Therefore, in order to ensure the strength of the mounting portion of the heavy hydraulic pump device 39, the pile driver 11 is provided with a pump support 42 as one of the plurality of related devices attached to the power unit 36. .

The pump support 42 hangs down from both longitudinal beams 40d, 40d of the frame 40 to support the rear portion (free end side) of the hydraulic pump device 39. As shown in FIGS. A gantry side member 43 attached to brackets 40i and 40i provided on vertical beams 40d and 40d, respectively; A large-diameter portion 46 is provided on the upper portion of the shaft member 44 , and the pump-side member 45 is provided on the lower portion of the shaft member 44 . Between the large-diameter portion 46 and the lower portion of the gantry-side member 43, the shaft member 44 is inserted in a coil spring 47, which is an elastic body.

The gantry side member 43 includes a cylindrical first holder 48 provided with a first through hole 48a for vertically penetrating the shaft member 44, connecting arms 48b projecting from both sides of the first holder 48, 48b and a pair of hanging rods 49, 49 corresponding to the connecting arm 48b. Further, the side surface of the first holder 48 is provided with a grease supply port 48c for supplying lubricating oil for reducing the sliding resistance of the shaft member 44 passing through the first through hole 48a.

The suspension rod 49 has one of the male threads provided at both ends of a long round bar member 49a which is reverse threaded. , 49b, the upper end is fastened to the brackets 40i, 40i of the vertical beams 40d, 40d with nuts 50, 50, and the lower end is fastened to the tip of the connecting arm 48b with nuts 51, 51, respectively. After loosening the anti-rotation nuts 49c, 49c screwed to both ends of the round bar member 49a to make the round bar member 49a rotatable with respect to the ball joint 49b, the round bar member 49a is provided with When a rotation operation jig (not shown) is engaged with the through-hole 49d and the round bar member 49a is rotated in a direction to reduce the amount of screwing, the ball joints 49b, 49b move away from each other, and the amount of screwing is reduced. , the ball joints 49b, 49b are configured to move toward each other when the rotational operation is performed in the direction of increasing . A universal joint or the like can be adopted as the universal joint in addition to a general ball joint. In addition, one of the suspension rods 49, 49 is eccentric to the front of the axis of the shaft member 44 and the other is eccentric to the rear, so that the shaft member 44 can move forward and backward. It prevents tilting.

The large diameter portion 46 has a male threaded portion 44a provided on the upper portion of the shaft member 44, a first nut 52 screwed onto the male threaded portion 44a, and a washer 53 brought into contact with the lower surface of the first nut 52. are doing. The first nut 52 is prevented from rotating by joining means such as welding in a state of being screwed onto the shaft member 44 . The shaft member 44 penetrates the washer 53 , the coil spring 47 , and the first holder 48 in this order from above, so that the lower end of the coil spring 47 contacts the upper surface of the first holder 48 and the upper end of the washer 53 to prevent the shaft member 44 from moving downward and falling out of the first holder 48 .

The pump-side member 45 includes a cylindrical second holder 54 provided with a second through hole 54a for vertically penetrating the shaft member 44, and locking arms 54b projecting from both sides of the second holder 54. , 54b, a second nut 55 screwed onto the male threaded portion 44b provided at the bottom of the shaft member 44, and a pair of left and right suspension fittings 58, 58 fastened with bolts 57 to an adapter 56 at the rear of the second hydraulic pump 39b. and Further, the second holder 54 is penetrated from above by the shaft member 44 and supported by a second nut 55 screwed onto the male threaded portion 44b. A split pin 55a is passed through the second nut 55 while a groove (not shown) in the second nut 55 and a through hole (not shown) provided in the shaft member 44 are aligned. A rotation stop is provided. Further, while the U-shaped locking groove 54c provided at the tip of the locking arm 54b is inserted into the locking hole 58a provided in the hanging metal fitting 58, the left and right hanging rods 49 are rotated by using the rotating operation jig. , 49 are respectively screwed into the ball joint 49b, the shaft member 44 and the second holder 54 are pulled up at the same time, and the coil spring 47 begins to contract. As a result, an upward elastic force is generated in the coil spring 47 , and a reaction force acts to pull up the hydraulic pump device 39 via the suspension fitting 58 .

In the pile driver 11 formed in this way, when the power unit 36 is mounted at the manufacturing site, various parts are first mounted on the floor frame 25 attached to the main frame 24 in order from large parts such as the engine 38 . After that, the hydraulic pump device 39 is attached to the rear part of the engine 38, and various pipes such as the fuel tank 38c and the hydraulic oil tank 32 are connected. Here, a frame 40 is assembled on the floor frame 25, and an exhaust pipe 38g, an exhaust port 38h, an SCR 37b, and the like, which constitute an exhaust path, are attached to the frame 40, respectively. At this time, a pump support 42 is attached to the space between the vertical beam 40d of the frame 40 and the hydraulic pump device 39, and adjustment is made so that the rear portion of the hydraulic pump device 39 is suspended by the pump support 42. .

Subsequently, the hoisting jigs are fixed to the prepared left and right houses 34, 35 and sequentially attached to the corresponding floor frames 25, 26 by the hoisting operation of the crane. At this time, in the engine storage house 35, by lowering the crane, the fuel tank 38c, the urea water tank 37a, the engine 38, and the hydraulic pump device 39 and the exhaust pipe 38g supported by the frame 40 on the rear side of the engine 38 are lifted. , the exhaust gas purifying device 37, etc. are integrally accommodated inside the house through the lower opening, and accordingly, the exhaust port 38h is located in the duct 35d provided on the top plate 35a. Finally, the installation of the power unit 36 is completed by connecting the intake pipe 38d to the air cleaner 38e installed on the top plate 35a of the house. Thereafter, through a plurality of processes, various large-sized parts are attached to the upper revolving body 14 to assemble the airframe. In the completed pile driver 11, by driving the engine 38, the power required from the power unit 36, for example, pressurized oil for operating the auger lifting winch device, can be obtained, and various operations including lifting the auger 22 can be obtained. It becomes a state where it can demonstrate the piling function (Fig. 1).

Here, when the large pile driver 11 is moved between sites, the crawler 12a, the leader 16, and the like are disassembled and assembled, and various devices on the vehicle body are periodically maintained. Therefore, the workers go up to the houses 34 and 35 and perform necessary work each time. At this time, the top plates 34a and 35a of the houses 34 and 35 serve as scaffolding for work. It has 35e and is formed with a step in the front-rear direction (FIG. 5), which serves as a scaffolding that enables movement between the front and rear parts of the upper rotating body 14, as well as up and down. The staircase 35e has a plurality of footboards 35g attached to a front plate 35f connecting the front and rear steps of the top plate 35a with an inclination, and a handrail 35h for preventing falling is installed on the outer edge. Further, the front plate 35f is provided with an intake port 35i for taking in cooling air from the cooling fan 38a (FIG. 4).

By the way, among large pile drivers, the pile driver 11, which is transported with the backstay 17 laid down on the upper revolving body 14 together with the leader 16 without being separated from the vehicle body in the transport posture, has a pair of left and right backstays. The base ends of the housings 34, 35 are rotatably supported by a pair of left and right arms 24a, 24a projecting outward from the vehicle width direction above the houses 34, 35, respectively. As a result, the base end portion (cylinder rod) of the backstay 17, which is laid down together with the leader 16 by contracting the backstay cylinder 17a, is arranged along the top plates 34a and 35a of the houses 34 and 35, respectively. That is, the flat top plates 34a, 35a of the houses 34, 35 not only ensure the above-described scaffolding function, but also do not interfere with the arrangement of the arm 24a, range) are also considered.

In this way, the exhaust pipe 38g and the exhaust gas purifying device 37 are attached to the frame 40 installed on the body frame, and the box-shaped houses 34 and 35 are suspended from their bottoms by an engine 38, a hydraulic pump device 39, and a hydraulic pump device 39. Since the exhaust pipe 38g and the exhaust gas purifying device 37 are integrally formed with an opening that allows them to be taken in and out, related equipment attached to the power unit 36 such as the exhaust gas purifying device 37 can be supported on the body frame side in the same manner as the engine 38. configuration is possible. As a result, assembly defects in the exhaust system due to manufacturing errors can be eliminated, and the power unit 36 can be easily and quickly installed on the body frame. That is, it is possible to obtain an installation structure for the power unit 36 that can improve the mountability in the limited space of the vehicle body.

In addition, at the design stage, the tower-shaped frame 40 can be framed by shaped steel, etc., so it is easy to add members and add parts mounting holes, and compatibility with existing products is ensured even if specifications change. can be secured. In other words, even if the number of various parts increases due to stricter exhaust gas regulations, restrictions on the layout within the house 35 are less likely to be imposed, and a degree of freedom in design can be provided. Furthermore, in the manufacturing stage, after the power unit 36 is sub-assembled on the body frame in a state close to completion, the house 35 can be assembled by a simple work of covering the house 35 suspended by a crane, thereby shortening the lead time. It is possible to improve productivity by Also, in maintenance, the amount of work required to attach and detach the housing 35 can be reduced, and particularly in situations where large-scale work such as remounting of the engine 38 is required, a remarkable effect can be obtained.

A pump support 42, which is one of the related devices, hangs down from the top of the frame 40 and is formed so as to be able to support the free end side of the hydraulic pump device 39. A coil spring 47 is elastically displaceable in the vertical direction. Therefore, before assembling the house 35, it is possible to secure a large work space to assemble the pump support 42 and adjust the support reaction force of the hydraulic pump device 39 (rotating operation of the suspension rod 49). It becomes possible, and workability can be improved greatly. Moreover, since the house 35 can be configured more simply, it is possible to improve manufacturability and reduce costs.

Further, the top plates 34a, 35a of the left and right houses 34, 35 attached to the floor frames 25, 26 serve as scaffolds for work, and among them, the upper end position of the pedestal 40 is located on the side where the engine 38 is mounted. Since the SCR 37b, for example, is arranged as the exhaust gas purification device 37 at a lower position than the top plate 35a can be formed flatter. In this way, the top plate 35a of the engine storage house 35 serves as a scaffold that enables movement between the front and rear parts of the upper revolving body 14, ensuring the safety of workers who perform disassembly/assembly and maintenance of the pile driver 11. be done.

Further, the engine storage house 35 is formed having a heat exchanger upstream chamber 35c provided on the upstream side of the radiator 38b in the flow direction of the cooling air, and the urea water tank 37a is accommodated in the heat exchanger upstream chamber 35c. Therefore, it is possible to suppress the temperature rise of the urea water tank 37a and reduce the influence on the urea water. Furthermore, since the fuel tank 38c is housed in the heat exchange device upstream chamber 35c so as to be side by side with respect to the urea water tank 37a in the front-rear direction, the temperature rise can be efficiently suppressed, and furthermore, the heat exchange device upstream chamber 35c can be used. A structure with excellent cooling performance can be obtained by eliminating the unnecessary upper volume in the chamber 35c.

Further, in combination with the functional structure of the heat exchange device upstream chamber 35c, the top plate 35a of the engine storage house 35 is formed with steps in the front-rear direction via a front plate 35f to which a plurality of footboards 35g are attached. Therefore, the house 35 can be raised and lowered safely and quickly by the footboard 35g. Furthermore, since the footboard 35g can be expanded in the width direction by utilizing the depth dimension of the house 35, it becomes easy to walk while going up and down, and the scaffolding can be moved without difficulty. In addition to this, since the front plate 35f is provided with the intake port 35i for taking in the cooling air, it is possible to comprehensively optimize the design.

Further, by applying the present invention to a pile driver, for example, a large pile driver 11 such as a three-point type pile driver provided with a pair of left and right backstays 17, 17 for supporting a leader 16, the above-described As described above, even if the houses 34 and 35 are frequently moved up and down, and there is a special usage mode due to the transportation posture, the equipment related to the power unit 36 such as the exhaust gas purification device 37 can be compactly installed in the house 35. By storing, the space on the house 35 can be used more effectively, and the pile driver 11 with high practical value can be realized.

Although the present invention has exemplified a pile driver as a construction machine, it is not limited to this, and can be applied to various construction machines equipped with an engine power unit as a power source for vertically movable excavators and cargo handling equipment, such as earth drills and cranes. can be applied. In addition, regarding the structure of the frame, the number of pedestals and beams, and the number of members that support the exhaust emission control system are arbitrary. Although it can be formed by using a large number of them, it is not limited to this, and one formed by bending a plate material or the like can be employed. In other words, any structure may be used as long as it is extensible and can be shared among a plurality of specifications. Furthermore, the pump support may be provided with an elastic body capable of suppressing vibration in the vertical direction while supporting the weight of the hydraulic pump, and can be appropriately configured according to various conditions such as the installation space.

In addition, if the house has an opening at the bottom and is box-shaped with a flat top plate, it may have a structure in which the front and rear parts can be divided at an intermediate position. Alternatively, the tread surface can be provided with uneven processing such as anti-slip. In this case, safe movement on the house can be ensured. In addition, a hydraulic oil tank can be arranged in place of the fuel tank in the heat exchange device upstream chamber in the engine housing. An oil cooler or the like can be included to cool the oil.

DESCRIPTION OF SYMBOLS 11... Piling machine 12... Lower traveling body 12a... Crawler 13... Revolving bearing 14... Upper revolving body 15... Leader arm 16... Leader 17... Back stay 17a... Back stay cylinder 18... Rear part Support Cylinder 19 Counterweight 20 Guide Pipe 21 Guide Gib 22 Auger 23 Screw Rod 24 Main Frame 24a Arm 25, 26 Floor Frame 27 Front Jack 28 Rear Jack 29 Driver cab 30 Winch mounting part 31 Top sheave block 32 Hydraulic oil tank 33 Hydraulic motor 34 Equipment storage house 34a Top plate 35 Engine storage house 35a Top Plate 35b Inspection door 35c Heat exchange device upstream chamber 35d Duct 35e Stairs 35f Front plate 35g Footboard 35h Handrail 35i Intake port 36 Power unit 37 Exhaust gas purification Apparatus 37a... reducing agent tank (urea water tank), 37b... selective reduction catalyst (SCR), 37c... injection nozzle, 38... engine, 38a... cooling fan, 38b... radiator, 38c... fuel tank, 38d... intake pipe , 38e air cleaner 38f bellows pipe 38g exhaust pipe 38h exhaust port 39 hydraulic pump device 39a first hydraulic pump 39b second hydraulic pump 39c gear pump 39d flange 40 Base 40a Front pillar 40b Rear pillar 40c Horizontal beam 40d Vertical beam 40e Bracket 40f Angle member 40g Strut member 40h Stay member 40i Bracket 41 U-shaped Bolt 42 Pump support 43 Frame side member 44 Shaft member 44a, 44b Male screw portion 45 Pump side member 46 Large diameter portion 47 Coil spring 48 First holder 48a First through hole 48b Connecting arm 48c Grease port 49 Hanging rod 49a Round bar member 49b Ball joint 49c Nut 49d Through hole 50, 51 Nut 52 First nut 53 Washer 54 Second holder 54a Second through hole 54b Locking arm 54c Locking groove 55 Second nut 55a Cotter pin 56 Adapter 57 Bolt, 58... Suspension fitting, 58a... Locking hole

Claims (4)

A lower traveling body equipped with crawlers, an upper revolving body provided in the upper part of the lower traveling body so as to be able to turn via a revolving bearing, and a working device provided in the front part of the upper revolving body so as to be able to move up and down. The upper rotating body comprises a body frame to which the rotating bearing is attached, a driver's cab provided on one side in the vehicle width direction of the body frame and operated to drive the work device, and the body A construction machine comprising a power unit provided on the other side in the vehicle width direction of a frame for generating a driving force of the working device, and a house capable of accommodating the power unit and a plurality of related devices attached thereto,
One of the plurality of related devices is an exhaust gas purifying device, and the exhaust gas purifying device is attached to a tower-shaped pedestal mounted on the aircraft frame,
The house has a top plate, and has a box-like shape with an opening at the bottom through which the exhaust gas purifier can be taken in and out integrally by a hanging operation, and is detachably attached to the machine frame. A construction machine characterized by: The power unit comprises an engine mounted on the body frame, and a hydraulic pump device cantilevered on the rear side of the engine opposite to the side where the cooling fan exists,
One of the plurality of related devices is a pump support that supports the hydraulic pump device attached to the engine, and the pump support hangs down from the top of the pedestal to support the hydraulic pump device. 2. The construction machine according to claim 1, further comprising an elastic body capable of supporting the free end side and elastically displaceable in the vertical direction. The exhaust gas purifying device is located at a position lower than the upper end position of the mounting frame, and the house is attached to the body frame so that the top plate allows movement between the front and rear parts of the upper revolving body. 3. The construction machine according to claim 1 or 2, wherein the construction machine serves as a scaffolding. The construction machine is a pile driver having a leader that can be raised and lowered at the front of the upper revolving body, and a backstay that supports the leader from the rear. 4. The construction according to any one of claims 1 to 3, characterized in that the auger is provided so as to be able to be raised and lowered, and is constructed so as to generate a driving force for a winch device for raising and lowering the auger by operating the power unit. machine.

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