JP4744586B2 - Earth strength test equipment - Google Patents

Description

  The present invention relates to a ground strength test apparatus for use in a pneumatic caisson method, and in particular, is attached to an operating arm of a caisson excavator in a high-pressure working room at the bottom of a caisson and remotely operated from the atmospheric pressure side via a caisson excavator. The present invention relates to a proof stress test apparatus.

Conventionally, the earth strength test apparatus has used a hydraulic jack to perform the earth strength test of the excavated ground, and therefore has a hydraulic unit comprising a hydraulic pump, power for driving the pump, and an oil tank for storing hydraulic oil. Is required. On the other hand, the caisson excavator for ground excavation also requires a similar hydraulic unit because it uses a hydraulic jack for driving the operating arm. However, in recent years, the adverse conditions required for the movement and installation of the ground strength test equipment in the high-pressure work room Because of the demand to reduce the work of workers at the site, a ground strength test device can be attached to the operating tip of the caisson excavator to remotely control the movement and installation of the ground strength test device via the caisson excavator from the atmospheric pressure side operation room (See Patent Document 1). However, since the earth strength test and test result measurement require precise hydraulic control and electronic circuit operation, it was difficult to integrate the earth strength test equipment and the hydraulic units of the caisson excavator. Therefore, in the current pneumatic caisson method, the hydraulic system of the ground strength test equipment is separated from the hydraulic system of the caisson excavator, and a hydraulic unit dedicated to the ground strength test equipment is prepared to provide high pressure on the ground in the high pressure work room or at the bottom of the caisson. It has become the mainstream to install and use it on the atmospheric pressure side floor of the work room slab that partitions the work room. However, placing a large and heavy hydraulic unit in the high-pressure working room requires a lot of time and labor for the movement and re-installation required as the ground excavation progresses, and also the atmospheric pressure side of the working room slab It is necessary to install hydraulic system piping and control electrical equipment wiring different from those for the caisson excavator, and in either case, it leads to an increase in work labor and material costs. There are still no suggestions for solving these problems.
JP-A-9-221762

  If you can integrate hydraulic units with large shapes and weights in the hydraulic systems for earth resistance test equipment and caisson excavators, especially among the components of the hydraulic system, it will lead to cost reduction in all respects, but the integration will be effective. Which system should be used to be advantageous, where should the hydraulic unit be utilized, where should the installation of the hydraulic unit be utilized, and the essential elements of each system to be reduced in function However, there is a problem such as how to rearrange them, and it is necessary to solve these problems in a form that is smaller and lighter than the two systems.

  Therefore, the present invention achieves a reduction in size and weight without reducing the function of the hydraulic system for the earth strength test apparatus that is remotely driven by being attached to the operating tip of the caisson excavator in the pneumatic caisson method. The purpose is to provide a ground strength testing device that can be integrated with a hydraulic system for caisson excavators to reduce costs.

In order to achieve the above object, a ground strength test apparatus according to a first aspect of the present invention is a hydraulic system for an excavator including a hydraulic unit including an oil tank, a hydraulic pump, and an electric motor for excavation that drives the hydraulic pump. A pneumatic caisson excavator is installed at the operating tip of a driven caisson excavator and applies a load for ground resistance testing to the ground by a hydraulic system dedicated to ground strength testing. The hydraulic pump is installed inside the oil tank for the excavator, the electric motor that drives the hydraulic pump is installed outside the oil tank, and the hydraulic pump inside the oil tank and the electric motor outside the oil tank are connected by a shaft coupling, by addition to combined oil tank and excavation and earth proof testing, the oil temperature was elevated on the ground proof testing apparatus operating in Yuso strains between the oil tank for excavator and ground proof testing device Characterized in that a cooling device for retirement.
According to a second aspect of the present invention, in the ground strength test apparatus according to the first aspect, the cooling device includes an oil from a hydraulic control valve provided in an oil feed path between the oil tank and the ground strength test apparatus. Is an oil cooler for a ground strength test apparatus, an air cooling fan for cooling a motor provided in the excavating motor, or an oil cooler provided for a caisson excavator.
The present invention according to claim 3, in the ground proof testing apparatus according to claim 1, the side plate of the oil tank is formed to freely pass through the hydraulic pump, the hydraulic pump on the inner surface side, the motor on the outer surface the mounting was joint plate, the hydraulic pump is oil-tightly to the outer surface of the side plate so as to pass through the side plate, and wherein the removably attaching.

  Of the two hydraulic systems for the earth strength test equipment and caisson excavator, omit the oil tank of one hydraulic system, preferably the hydraulic unit in the system for ground strength test equipment, and compare it with that for caisson excavator The small and lightweight hydraulic pump and the electric motor for driving the hydraulic pump are installed and connected to the inside and outside of the oil tank of the hydraulic unit in the caisson excavator hydraulic system, and the oil in the same oil tank is shared by the two systems. At the same time, since the cooling mechanism for the earth strength test using the cooling device of the hydraulic unit for the excavator is incorporated in the return path from the hydraulic system to the oil tank, the entire hydraulic system is reduced in size and weight. At the same time, since one hydraulic unit is not required, the manufacturing cost is reduced accordingly.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 schematically shows a use state of a ground strength test apparatus according to the present invention in a pneumatic caisson method. In the figure, the lower end of the caisson housing B of the pneumatic caisson A is closed by a work chamber slab C, and a high-pressure work chamber D surrounded by a blade edge E is defined below the work chamber slab C. A traveling rail G that suspends and moves the caisson excavator F is installed on the ceiling surface of the work room slab C on the work room D side. As will be described later, the caisson excavator F carries a hydraulic unit H of a hydraulic system that drives the excavation bucket at the tip of the boom. Here, instead of the excavation bucket, the ground strength test apparatus I is provided at the end of the boom, that is, at the operating end. The ground strength test apparatus I incorporates a hydraulic unit H for the caisson excavator F in its hydraulic system, and the hydraulic pressures of the caisson excavator F and the ground strength test apparatus I that operate via the hydraulic unit H, respectively. It is driven by the system and extends between the ceiling surface of the working room D and the ground surface J at the test position and is fixed vertically.

  In FIG. 2, a hydraulic unit H is an oil tank 1, an electric motor 2, and a hydraulic pump that is driven by the electric motor 2 to increase / decrease the oil from the oil tank 1 and send it to each hydraulic system for the original caisson excavator F. The hydraulic pump 3 operates the excavator hydraulic jack F2 attached to the boom F1 at the tip of the excavator to drive the bracket F3 at the tip of the boom. At the time of ground excavation, a excavation bucket (not shown) is attached to the bracket F3. Here, in order to perform a ground strength test, a ground strength test apparatus I is attached to the bracket F3. The ground strength test apparatus I has an upper part as an expandable support pipe I1 and a lower part as a loading means including a loading load hydraulic jack I2 and a loading plate I4 that transmits the load of the hydraulic rod I3 to the ground J. The oil tank 1 for the caisson excavator F is used as a hydraulic oil source for the hydraulic jack I2 for the loading load, and an oil tank for another hydraulic unit for a ground strength test apparatus, which has been conventionally required, is unnecessary.

  On the other hand, since the load-loading hydraulic jack I2 needs to be operated by a system different from the excavating hydraulic jack F2, the electric load 2 of the ground strength test apparatus I is separated from the electric motor 2 and the hydraulic pump 3 constituting the hydraulic unit H. The electric motor 4 and the hydraulic pump 5 driven by the electric motor 4 are arranged for the load-loading hydraulic jack I2, but the hydraulic pump 5 is connected to the oil tank 1 so that the hydraulic unit H does not increase in size significantly. The electric motor 4 is connected to the hydraulic pump 5 through a shaft coupling that is attached to the outside of the oil tank 1 and passes through the tank side wall plate in a liquid-tight manner. Desirably, as will be described later with reference to FIG.

  3A and 3B show an example of an oil feed path around the hydraulic pump 5 for earth strength test. In the oil tank 1 of the hydraulic unit H, the oil passed through the filter 13 by the hydraulic pump 5 and sucked into the hydraulic pump 5 from the oil suction pipe 16 is pressurized and discharged to the oil discharge pipe 17 through the pipe 18. To the hydraulic control valve 21. In response to a command from a control device in the central remote control command room (not shown), the hydraulic control valve 21 operates the load-bearing hydraulic jack I2 of the ground strength test device I to perform the ground strength test. Make it. The oil returned from the hydraulic jack I2 is sent from the hydraulic control valve 21 through the pipe 19 to the ground strength test oil cooler 7 and cooled. The oil cooler 7 is provided in the effective cooling area of the air cooling fan 6 provided for cooling the motor on the rear side of the excavating motor 2, that is, on the side opposite to the excavating hydraulic pump 3 driven by the electric motor 2, by a support bracket 8 and a joining plate 9. It is attached and prevents the oil temperature from rising during operation of the earth resistance test device I. The cooled oil is returned to the oil tank 1 through the pipes 14 and 15. In this case, the amount of oil required for the ground strength test is relatively small relative to the amount of oil required for operation of the excavator. The ability of can be used effectively.

  In addition, if the installation structure which makes easy the maintenance inspection of the hydraulic pump 5 for the earth strength test installed in the oil tank 1 and its electric motor 4 is described, when the earth strength test apparatus I is not used first, the electric motor for the earth strength test 4 can be removed from the hydraulic pump 5, and the opening on the pump side after the removal is covered with a sealing lid so that the motor 4 can be maintained, inspected or stored. In addition, since the hydraulic system of the caisson excavator F is different, the caisson excavator F can be operated even when the electric motor 4 is detached. That is, the hydraulic pump 3 for excavation driven by the electric motor 2 for excavator includes an oil-cooled oil cooler 12 for excavator by a pipe (not shown) and is formed between the oil tank 1 and the hydraulic control valve 21. Is placed inside. 3A and 3B, the side plate 10 of the oil tank 1 is formed so as to be able to pass through a hydraulic pump 5 for ground strength test, the hydraulic pump 5 is attached to one surface, and the motor 4 is attached to the other surface. The joint plate 11 connected to the hydraulic pump 5 is attached to the side plate 10 in an oil-tight and detachable manner by inserting the hydraulic pump 5 into the oil tank 1. Accordingly, since the electric capacity test motor 4 and the hydraulic pump 5 can be removed from the oil tank 1 together with the joint plate 11 while being connected, maintenance management is facilitated.

  4A and 4B show another example of an oil feed path including the hydraulic pump 5 for ground strength test. The oil discharged from the hydraulic pump 5 to the oil discharge pipe 17 is tested for the ground strength through the hydraulic control valve 21. Until it is sent to the load load hydraulic jack I2 of the apparatus I, the oil is returned to the hydraulic control valve 21 from the hydraulic jack I2 to the oil cooler 7 for ground strength test. Instead, the oil cooled to the air-cooled oil cooler 12 provided for the caisson excavator and cooled is returned to the oil tank 1 through the pipes 20 and 15. That is, in this case, an oil cooler 12 that is comparatively larger than that for the earth strength test is used in the oil feeding path for the earth strength test, and the oil cooler 12 that is relatively larger than that for the earth strength test is used. Manufacturing cost can be reduced.

The installation drawing in the pneumatic caisson method shown with a schematic sectional drawing of the earth strength test apparatus which concerns on this invention. The arrangement | positioning figure in the relationship with the hydraulic unit for caisson excavators of the hydraulic unit for ground strength test apparatuses of the Example which concerns on this invention. The block diagram which shows an example of the oil feed path | route of the hydraulic unit for ground strength test apparatuses in the Example of FIG. 2 with a front view. The block diagram which shows a part of oil feeding path | route of the hydraulic unit of FIG. 3A with a side view. The block diagram which shows the other examples of the oil feed path | route of the hydraulic unit for ground strength test apparatuses in the Example of FIG. 2 with a front view. The block diagram which shows a part of oil feeding path | route of the hydraulic unit of FIG. 4A with a side view.

Explanation of symbols

A Pneumatic caisson
D High pressure working room F Caisson excavator H Hydraulic unit I Ground strength test equipment F1 Boom F2 Hydraulic jack for excavation I2 Hydraulic jack for loading load I4 Loading plate 1 Oil tank 2 Electric motor for excavation 3 Hydraulic pump for excavation 4 Electric motor for ground strength test 5 Hydraulic pump for earth resistance test 6 Air cooling fan 7 Oil cooler 12 for earth resistance test Air cooling oil cooler for excavator 14, 15 Pipe 16 Oil suction pipe 17 Oil discharge pipe 18-20 Pipe 21 Hydraulic control valve

Claims (3)

At the working tip of the caisson excavator (F) driven by a hydraulic system for excavator including a hydraulic unit comprising an oil tank (1), a hydraulic pump (3), and an excavating electric motor (2) for driving the hydraulic pump. In the pneumatic caisson ground strength test equipment (I), which is installed and applies the load for ground strength test to the ground by the hydraulic system dedicated to ground strength test,
The hydraulic pump (5) included in the hydraulic system dedicated to the earth resistance test is installed inside the oil tank (1) for the excavator, and the electric motor (4) that drives the hydraulic pump (5) is installed outside the oil tank. The hydraulic pump (5) inside the oil tank and the electric motor (4) outside the oil tank are connected by a shaft coupling, so that the oil tank (1) is used for both excavation and ground strength test, and the ground strength test device (I ) And an oil tank (1) for excavator provided with a cooling device for cooling the oil temperature that has risen during operation of the ground strength test device. The ground strength test apparatus according to claim 1,
The cooling device is an oil cooler for a ground strength test device to which oil is fed from a hydraulic control valve (21) provided in an oil feed path between the oil tank (1) and the ground strength test device (I). (7) and an electric cooler (6) for cooling an electric motor provided in the electric motor for excavation (2) or an oil cooler (12) provided for an caisson excavator. In the ground proof testing apparatus according to claim 1, wherein said side plates (10) of the oil tank (1) is formed to freely pass through the hydraulic pump (5), the hydraulic pump on the inner surface side (5), on the outer surface the joint plate fitted with said electric motor (4) (11), wherein the oil-tight to the outer surface of the hydraulic pump (5) is the side plate so as to pass through said side plates (10) (10), removably attaching it earth strength test apparatus shall be the features a.

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