JP2018123733A - Electric hydraulic pump and loading test device for stabilized implant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric hydraulic pump enabling structural weight saving capable of suppressing a weight of a hydraulic pump, and capable of easily adjusting a discharge amount of pressure oil with excellent operability.SOLUTION: An electric hydraulic pump 1 includes: a metal hollow box 2 having an oil discharge port 21; a rubber tank 3 provided at a side part of the box 2, communicating with the box 2, and forming a pressure oil storage space 4 therein; a pump block 10 provided at an upper part of the box 2, and configured to discharge pressure oil 5 in the pressure oil storage space 4 from the oil discharge port 21 by electric drive; and a discharge adjustment operation unit 14 capable of adjusting a drive amount of a drive shaft 101 of the pump block 10 in cooperation with a movement amount, to adjust a discharge amount of the pressure oil 5.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electric hydraulic pump that is electrically driven and a loading test apparatus for a stabilizing embedded material such as a lock bolt in which the electric hydraulic pump is used.

  Conventionally, when performing a tunnel lock bolt pull-out test, a bolt tension test on an aerial work platform, a tension test of an anchor on a slope, etc., a lock bolt, bolt or anchor installed on the site A center hole jack is attached to the projecting part, the center hole jack is driven by a hydraulic pump, a load in the pulling direction is applied to the projecting part, and a test for measuring displacement with respect to the loaded load is performed.

  FIG. 7A shows an example of the site of a tunnel rock bolt pull-out test, in which 200 is a loading test apparatus, 201 is a natural ground, 202 is a rock bolt, 203 is shotcrete, 204 is secondary lining concrete, 205. Is a tunnel space. FIG. 7B shows an example of the site of a bolt tensile test on an aerial work platform, where 300 is a loading test apparatus, 301 is a structure, 302 is a bolt, and 303 is an aerial work platform. FIG. 7 (c) shows an example of the site of tension test of the slope anchor on the scaffold, 400 is a loading test device, 401 is an slope, 402 is an anchor, and 403 is a scaffold.

  Since such a loading test is performed in the field, not in a factory or a test room, it is desirable that components such as a hydraulic pump constituting the loading test apparatus are lightweight and excellent in portability. For example, in the loading test apparatus of Patent Document 1, it is desirable that the hydraulic pump has a compact lightweight structure (weight around 20 kg) (see Patent Document 1, paragraph [0051]).

JP 2003-139673 A

  However, the weight of about 20 kg of the hydraulic pump disclosed in Patent Document 1 can be carried by human power, but it is difficult to say that the weight can be freely moved by an operator on site. Further, since a larger and heavier hydraulic pump is usually required when the load is increased, there is a need for a structural weight reduction that can suppress the weight of the hydraulic pump even when the load is increased.

  In addition, depending on the type of loading test apparatus, there are cases where loading is desired quickly and cases where loading is desired slowly, and thus operability capable of easily adjusting the loading speed is required. However, the hydraulic pump disclosed in Patent Document 1 is simply ON. Since it is driven by a hand operating unit with a switch for switching off, it does not have operability that can easily adjust the loading speed and the discharge amount of pressure oil.

  The present invention is proposed in view of the above-described problems, and can reduce the weight of the hydraulic pump in a structural manner and can easily adjust the discharge amount of pressure oil with excellent operability. It is an object of the present invention to provide an electric hydraulic pump that can be used, and a loading test apparatus for a stabilizing embedded material in which the electric hydraulic pump is used.

The electric hydraulic pump of the present invention has an oil discharge port, and is provided in a metal hollow box and a side portion of the box, and communicates with the box to form a pressure oil storage space therein. A rubber block, a pump block provided at the upper part of the box and discharging the pressure oil in the pressure oil storage space from the oil discharge port by electric drive, and a drive amount of the drive shaft of the pump block in conjunction with the amount of movement And a discharge adjustment operation section capable of adjusting the discharge amount of the pressure oil.
According to this, a part supporting the pump block having a certain weight can be used as a metal box to ensure a required support strength, and a part of the part forming the pressure oil storage space is a rubber tank. Therefore, the weight of the hydraulic pump can be reduced, and the weight can be reduced, for example, even when the loading load becomes large in a loading test and a hydraulic pump that is usually heavy is required. Hydraulic pump. In addition, the rubber tank generates negative pressure in the rubber tank when the pump is activated and contracts due to atmospheric pressure, and returns to its original size when released, so the negative pressure during pressure oil suction can be used efficiently. The amount of hydraulic oil can be reduced. When the rubber tank is not used, the sealed box body becomes negative pressure during operation, and the hydraulic oil suction efficiency during pump operation decreases. In addition, the discharge adjustment operation part that can adjust the discharge amount of pressure oil in conjunction with the amount of movement makes it possible to easily adjust the discharge amount of pressure oil with excellent operability. The operability can be easily adjusted, and it is possible to cope with both a case where loading is desired quickly and a case where loading is desired slowly.

In the electric hydraulic pump according to the present invention, the box is a substantially rectangular box, and a cylinder covering the rubber tank is provided, and a battery support portion to which a battery is mounted is provided at a position corresponding to the cylinder. It is characterized by.
According to this, the stability of the state where the electric hydraulic pump is placed is improved by arranging the pump block having a certain amount of weight and the battery in a well-balanced position together with a substantially rectangular box-shaped box body, Falling can be prevented.

In the electric hydraulic pump according to the present invention, a grip portion is provided between the pump block and the battery support portion, and the trigger-like discharge adjustment operation portion is provided on the pump block side of the grip portion. It is characterized by.
According to this, the electric hydraulic pump can be stably carried with the grip portion, and the portability can be improved. In addition, it is possible to use the electric hydraulic pump while holding the grip portion, and it is possible to use it in various states such as a laid state, a standing state, and a holding state. In addition, by making the discharge adjustment operation portion into a trigger shape, it is possible to adjust the discharge amount of the pressure oil according to the pulling condition, and it is possible to handle it with the same feeling as a manual electric tool such as a hammer drill. Accordingly, the discharge amount of the pressure oil can be easily adjusted with better operability.

The electric hydraulic pump according to the present invention is characterized in that the cylinder is detachably attached to the box.
According to this, the maintenance work of a rubber tank or a box can be facilitated.

The electric hydraulic pump according to the present invention is characterized in that an end face that is substantially flush with an outer end face of the cylindrical body is provided on the battery mounted on the battery support portion.
According to this, the outer end surface of the cylinder and the end surface of the battery can be stably placed on the mounting surface and can be stably placed. The space can be saved.

The electric hydraulic pump of the present invention has an opening provided at a position different from the position where the rubber tank is provided on the side portion of the box, and the opening is closed by a removable closing body, In a state where the closing body is removed, another rubber tank that communicates with the box through the connecting member and forms a pressure oil storage space can be connected to the opening.
According to this, it is possible to increase another rubber tank as necessary, and it is possible to easily cope with a case where a large hydraulic pressure is required, for example, when a loading test requiring a large load is performed.

The stabilized embedding material loading test apparatus according to the present invention is a stabilized embedding material loading test apparatus including the electric hydraulic pump according to the present invention. Alternatively, a center hole jack that loads a pulling force on a connecting member connected to the projecting portion, and the electric hydraulic pump that hydraulically drives the center hole jack are provided.
According to this, the burden of the operator of a load test can be reduced by using a lightweight electric hydraulic pump for a load test. Further, it is possible to cope with both a case where loading is desired rapidly and a case where loading is desired slowly in the loading test, and the loading load can be easily adjusted with excellent operability. Moreover, the range of the load test which can be implemented can be expanded.

  According to the present invention, it is possible to reduce the weight of the hydraulic pump and to reduce the weight of the hydraulic pump, to have excellent operability, and to easily adjust the discharge amount and pressurization speed of the pressure oil. .

The perspective view which shows the electric hydraulic pump which can implement this invention. The top view which shows the electric hydraulic pump of embodiment. The partially broken front view which shows the electric hydraulic pump of embodiment. The partially broken front view of the state which stood the electric hydraulic pump of embodiment. The partially broken front view of the state which increased another rubber tank in the electric hydraulic pump of embodiment. The figure which shows the whole structure of the loading test apparatus of the stabilization embedding material of embodiment. (A) is a diagram showing an example of the site of a tunnel lock bolt pull-out test, (b) is a diagram showing an example of a site of a bolt tensile test on an aerial work platform, and (c) is a tension of an inclined ground anchor on a scaffold. The figure which shows the site example of a force test.

[Electric Hydraulic Pump and Stabilized Embedding Loading Test Apparatus]
The electric hydraulic pump 1 according to the embodiment of the present invention includes a metal hollow box 2 having an oil discharge port 21 and an on-off valve 26 as shown in FIGS. 2 is formed in a substantially rectangular box shape. A substantially bottomed cylindrical rubber tank 3 is provided on the side of the box 2, and the rubber tank 3 is detachably attached to the side of the box 2 in a state in which liquid leakage is prevented. . The box 2 and the rubber tank 3 communicate with each other to form a pressure oil storage space 4, and the pressure oil 5 is stored in the pressure oil storage space 4.

  In the illustrated example, a sleeve portion 22 that protrudes outward is provided on one side wall of a substantially rectangular box-shaped box body 2, and the inside of the sleeve portion 22 serves as a communication port 23, and the outer peripheral surface of the sleeve portion 22. A circumferential recess 24 is formed in the vicinity of the outer end. In addition, a circumferential recess 31 is formed at the inner end of the rubber tank 3 so as to protrude inward and to be recessed outside. Then, the concave portion 24 of the rubber tank 3 is fitted to the concave portion 24 of the sleeve portion 22, the O-ring 6 is fitted on the outside of the fitted concave portion 31, and the rubber tank 3 is connected to the sleeve portion 22 and the box 2. The mounting portion is sealed so as not to leak by urging the O-ring 6 inward.

  On the outside of the rubber tank 3, a substantially bottomed cylindrical tube body 7 that covers the rubber tank 3 is provided. The cylindrical body 7 is detachably attached to the box body 2. In the illustrated example, a male screw is formed on the outer periphery of the sleeve portion 22, and a female screw is formed on the inner periphery of the inner end portion of the cylindrical body 7. The cylinder 7 is detachably attached to the box 2 such that the rubber tank 3 and the O-ring 6 are covered.

  An opening 25 is provided at a position different from the position where the rubber tank 3 is provided on the side of the box body 2, and the opening 25 is closed by a removable closing body 8. In the present embodiment, an opening 25 is formed in the side wall of the box 2 that faces the side wall of the box 2 where the rubber tank 3 is provided, and the opening 25 is closed by the closing body 8. A female screw is formed on the inner periphery of the opening 25, and a male screw is formed on the outer periphery of the closing body 8. The closing body 8 is screwed into the opening 25, and on the outer periphery inside the male screw portion of the closing body 8. The peripheral O-ring 81 is pressed against the inner peripheral surface of the opening 25, and the mounting portion is sealed so as not to leak. An oil filler plug 82 is provided in the approximate center of the closing body 8.

  As shown in FIG. 5, the box 2 can be connected to another rubber tank 3 a that is in a state in which the closing body 8 is removed and communicates with the box 2 to form an oil storage space 4 ′ therein. It has become. When another rubber tank 3 a is connected, the connecting member 9 is attached to the opening 25 with the closing body 8 removed, and the other rubber tank 3 a is connected via the connecting member 9. In the example of FIG. 5, a male screw that is screwed into the female screw of the opening 25 is formed in the inward portion of the connecting member 9, and an O-ring 91 is provided on the outer periphery inside the male screw portion. In a state where the inward portion of the connecting member 9 is screwed into the opening 25, the connecting portion 9 and the box 2 are sealed so that the attachment portion does not leak.

  A male screw that is screwed into a female screw of a cylinder body 7a, which will be described later, is formed on the outer side of the connecting member 9, and a circumferential recess 92 is formed on the outer peripheral surface at a position outside the male screw portion. . A circumferential recess 31a is formed at the inner end of the other rubber tank 3a. Then, the concave portion 92 of the connecting member 9 is fitted so that the concave portion 31a of another rubber tank 3a overlaps, and the O-ring 6a is externally fitted to the outside of the fitted concave portion 31a, so that the other rubber tank 3a is connected to the connecting member 9. In addition, the attachment portion of the connecting member 9 and another rubber tank 3a is sealed so as not to leak due to the inward bias of the O-ring 6a.

  With the structure in which the other rubber tank 3a is detachable, for example, the capacity of the pressure oil storage space 4 when only the rubber tank 3 is attached is about 350 ml, and the structure can be made smaller and lighter. In addition, the structure corresponding to the output of larger hydraulic pressure and load is set such that the capacity of the pressure oil storage space 4 is increased to about 500 ml when another rubber tank 3a is added to a case where a heavy load is required. It can be.

  A cylindrical body 7a having a substantially bottomed cylindrical shape that covers the rubber tank 3a is provided outside the other rubber tank 3a. The cylinder body 7a is detachably attached to the box body 2 via the connection member 9, and a female screw formed on the inner periphery of the inner end portion of the cylinder body 7a is screwed to a male screw on the outer side of the connection member 9. The rubber body 3a and the O-ring 6a are covered with the cylindrical body 7a. An oil filler 32a is provided at the center of the bottom of another rubber tank 3a.

  In addition, when supplying oil to the electric hydraulic pump 1 to which the closing body 8 is attached, the electric hydraulic pump 1 is set up as shown in FIG. When refueling the electric hydraulic pump 1 in the process of removing the closing body 8 and attaching another rubber tank 3a, the electric hydraulic pump 1 is set up as shown in FIG. The pressure oil 5 is supplied to the inside of the connecting member 9, and another rubber tank 3 a is attached to the connecting member 9, and the oil filler plug 32 a is removed to supply oil into the other rubber tank 3 a.

  Moreover, as shown in FIGS. 1-5, the pump block 10 which discharges the pressure oil 5 of the pressure oil storage space 4 from the oil discharge port 21 by the electric drive is provided in the upper part of the box 2. The pump block 10 according to the present embodiment is a pump block 10 of a plunger pump that performs a pump action by reciprocating a plunger by rotation driving of a drive shaft 101, and corresponds to a radial plunger system of a twin pump. . Above the pump block 10, a motor 15 that is supplied with electric power from a battery 12 to be described later and electrically drives the drive shaft 101 of the pump block 10 is housed in the housing.

  A battery support portion 11 to which a rechargeable battery 12 is detachably attached is provided at a position corresponding to the cylindrical body 7. In the illustrated example, the battery support portion 11 is fixed to the cylindrical body 7 and is provided so as to stand up. A battery 12 is mounted on the standing portion of the battery support portion 11. The battery 12 is provided with an end surface 121 that is substantially flush with the outer end surface 71 of the cylindrical body 7 attached to the box body 2 in a state of being mounted on the battery support portion 11.

  A grip portion 13 is installed between the pump block 10 and the battery support portion 11, and a trigger-like discharge adjustment operation portion 14 is provided on the pump block 10 side of the grip portion 13. The discharge adjustment operation unit 14 discharges the pressure oil 5 from the oil discharge port 21 and adjusts the drive amount of the drive shaft 101 of the pump block 10 in conjunction with the movement amount, thereby adjusting the discharge amount of the pressure oil. It is possible.

  Next, a description will be given of a loading test apparatus for a stabilizing embedded material including the electric hydraulic pump 1 of the present embodiment. FIG. 6 shows an overall configuration of a rock bolt loading test apparatus 500 corresponding to a stabilizing embedding material.

  The lock bolt loading test apparatus 500 is fixed to the projecting portion from the embedding surface 502 of the natural ground 501 of the rock bolt 503 driven so as to be substantially orthogonal to the natural ground 501, or to be aligned with the core. A center hole jack 505 that loads a pulling force on the connecting member 504 connected in this manner is provided, and the center hole jack 505 is hydraulically driven by the electric hydraulic pump 1 of the present embodiment. In the electric hydraulic pump 1 of this embodiment, for example, the maximum stroke of the center hole jack 505 can be reached in about 30 seconds at the fastest.

  Between the embedding surface 502 of the lock bolt 503 and the center hole jack 505, a reaction force plate 506, an angle adjusting base 507, and an angle adjusting ball seat 508 are provided in this order. The angle adjusting ball seat 508 can be tilted with respect to the angle adjusting base 507, and the angle adjusting ball seat 508 is provided with a holding mechanism for holding the connecting member 504 releasably. The center hole jack 505 is provided to be fitted to the angle adjusting ball seat 508 and connected to the electric hydraulic pump 1 that is hydraulically driven via a hydraulic hose 509.

  A hydraulic signal generator 510 is connected to the hydraulic hose 509, and the hydraulic signal generator 510 detects the hydraulic pressure of the oil sent from the electric hydraulic pump 1 to the hydraulic hose 509 and generates a hydraulic signal. The hydraulic signal generation unit 510 is electrically connected to the transmitter 511 via a cable, and the transmitter 511 transmits the hydraulic signal from the hydraulic signal generation unit 510 to the recording display unit 512 by wireless transmission.

  A displacement signal generator 514 is attached to the center hole jack 505 via a magnet stand 513. The displacement signal generation unit 514 generates a displacement signal by detecting the displacement of the predetermined portion of the protrusion of the lock bolt 503 or the predetermined portion of the connecting member 504 connected to the protrusion before and after the extraction force loading. In the illustrated example, a square washer 515 is fixed to a connecting member 504 that protrudes to the rear side of the center hole jack 505, and the tip of the measuring element of the displacement signal generating unit 514 is brought into contact with the square washer 515. A displacement signal is generated by detecting the displacement of the predetermined portion before and after loading of the extraction force.

  The displacement signal generation unit 514 is electrically connected to the transmitter 511 via a cable, and the transmitter 511 transmits the displacement signal from the displacement signal generation unit 514 to the recording display unit 512 by wireless transmission. The transmitter 511 wirelessly transmits the hydraulic signal generated by the hydraulic signal generation unit 510 and the displacement signal generated by the displacement signal generation unit 514 to the recording display unit 512 in substantially real time.

  The recording display unit 512 includes, for example, a personal computer, a portable information terminal, a smartphone, or the like. A control unit such as a CPU, a storage unit such as a memory or a hard disk, an input unit such as a keyboard, a mouse, or a touch panel, a liquid crystal display, a touch panel, or the like. Communication units such as an image display unit, a wireless communication interface, and a wired communication interface are provided. The storage unit includes a program storage unit that stores an application program such as a load displacement processing program that performs processing related to the operation system and load displacement correlation information, and a data storage unit that stores data such as load displacement correlation information.

  The recording display unit 512 receives the hydraulic pressure signal and the displacement signal, and the control unit that operates according to the load displacement processing program acquires the hydraulic pressure signal and the displacement signal, and recognizes the corresponding load from the hydraulic pressure signal. The recognition of the load from the hydraulic pressure signal is obtained by multiplying the hydraulic pressure value of the hydraulic pressure signal by a pressure receiving area that is set to be changeable with respect to the load displacement processing program, for example. Then, the recording display unit 512 generates load displacement correlation information indicating a correspondence relationship between the load and the displacement from the recognized load and the displacement signal by the control unit operating according to the load displacement processing program, and stores the load displacement correlation information in the storage unit And the load-displacement correlation information is displayed on the image display unit in a predetermined format such as a load-displacement graph.

  According to the present embodiment, the portion that supports the pump block 10 having a certain amount of weight can be used as the metal box 2 to ensure the required support strength and to form the pressure oil storage spaces 4 and 4a. By using a part of the rubber tanks 3 and 3a, it is possible to reduce the weight of the hydraulic pump so that the weight of the hydraulic pump can be reduced. Even if it becomes, it can be set as the lightweight hydraulic pump by which the weight was suppressed. For example, the electric hydraulic pump 1 according to the present embodiment is a single tank that has only a rubber tank 3 attached thereto, is filled with the pressure oil 5, and has a battery 12 attached. This is possible, and can be significantly lighter than the hydraulic pump having a weight of around 20 kg in Patent Document 1.

  Also, since the rubber tanks 3 and 3a generate a negative pressure in the rubber tank when the pump is operated and contract due to the atmospheric pressure and return to the original size when released, the negative pressure when sucking in the pressure oil is effectively reduced. It can be used and the amount of hydraulic oil can be reduced. When the rubber tank is not used, the sealed box body becomes negative pressure during operation, and the hydraulic oil suction efficiency during pump operation decreases. Further, the discharge adjustment operation unit 14 capable of adjusting the discharge amount of the pressure oil in conjunction with the amount of movement can easily adjust the discharge amount of the pressure oil 5 with excellent operability, for example, the loading speed of the loading test. Can be easily adjusted with excellent operability, and it is possible to cope with both a case where loading is desired quickly and a case where loading is desired slowly.

  Further, the box body 2 is formed in a substantially rectangular box shape, a cylinder body 7 that covers the rubber tank 3 is provided, and a battery support portion 11 to which the battery 12 is mounted is provided at a position corresponding to the cylinder body 7 and has a certain weight. By arranging the pump block 10 and the battery 12 in a well-balanced position, the stability of the state in which the electric hydraulic pump 1 is placed can be improved and the fall can be prevented.

  Moreover, by providing the grip part 13 between the pump block 10 and the battery support part 11, the electric hydraulic pump 1 can be stably carried with the grip part 13 and the portability can be improved. In addition, the electric hydraulic pump 1 can be used while holding the grip portion 13, and can be used in various states such as a laid state, a standing state, and a hand-held state. Further, by providing a trigger-like discharge adjustment operation portion 14 in the grip portion 13, it becomes possible to adjust the discharge amount of the pressure oil 5 according to the pulling condition, and it is handled in the same sense as a manual electric tool such as a hammer drill. It becomes possible. Accordingly, the discharge amount of the pressure oil 5 can be easily adjusted with better operability.

  Further, by attaching the cylinders 7 and 7a to the box 2 in a detachable manner, maintenance work for the rubber tanks 3 and 3a and the box 2 can be facilitated. Further, the end surface 121 of the battery 12 mounted on the battery support 11 is arranged substantially flush with the outer end surface 71 of the cylinder 7, so that the outer end surface 71 of the cylinder 7 and the end surface 121 of the battery 12 are placed on the mounting surface. It can be stably placed in a standing state, and for example, when it is placed on a work table at a high place, it does not take a place, and the installation place can be saved. Further, the detachable closing body 8 makes it possible to increase the number of other rubber tanks 3a as required. For example, when a large hydraulic pressure is required, such as when a loading test requiring a large load is performed, it is easy. Can respond.

  Moreover, according to the lock bolt loading test apparatus 500 of this embodiment, the burden of the operator of a loading test can be reduced by using the lightweight electric hydraulic pump 1 for a loading test. Further, it is possible to cope with both a case where loading is desired rapidly and a case where loading is desired slowly in the loading test, and the loading load can be easily adjusted with excellent operability. Moreover, the range of the load test which can be implemented can be expanded.

[Included scope of the invention disclosed herein]
In addition to the inventions and embodiments listed as inventions, the invention disclosed in the present specification is specified by changing these partial contents to other contents disclosed in the present specification, to the extent applicable. Or those specified by adding other contents disclosed in the present specification to those contents, or those specified by deleting these partial contents to the extent that partial effects can be obtained and making them higher-level concepts Include. The invention disclosed in this specification includes the following modified examples and added contents.

  For example, the shape of the box in the electric hydraulic pump of the present invention is not limited to the substantially rectangular box-like box 2 of the above embodiment, and may be a polygonal column, for example. In addition, the configuration of the discharge adjustment operation unit in the present invention is not limited to the trigger-like discharge adjustment operation unit 14 of the above-described embodiment, and has an appropriate configuration capable of adjusting the discharge amount of pressure oil in conjunction with the amount of movement. It is possible. In addition, the rubber tank in the present invention can have an appropriate configuration and shape that communicates with the box and forms the pressure oil storage space therein. Further, the pump block in the present invention can have an appropriate configuration for discharging the pressure oil in the pressure oil storage space from the oil discharge port by electric drive.

  In addition, the stabilizing embedding material of the stabilizing embedding material loading test apparatus of the present invention is embedded in an appropriate ground such as an anchor or a bolt, an inclined ground, a structure, or the like in addition to the above-described lock bolt. It is possible to use an appropriate member.

  The present invention is applied to a jacking test of a stabilized embedded material performed in the field such as a tunnel lock bolt pull-out test, a bolt tension test on an aerial work platform, and a tension test of a slope anchor on a scaffold. Can be used as a hydraulic pump for driving the motor.

DESCRIPTION OF SYMBOLS 1 ... Electric hydraulic pump 2 ... Box body 21 ... Oil discharge port 22 ... Sleeve part 23 ... Communication port 24 ... Recess 25 ... Opening part 26 ... On-off valve 3, 3a ... Rubber tank 31, 31a ... Recess 32a ... Oil plug 4, 4 '... Pressure oil storage space 5 ... Pressure oil 6, 6a ... O-ring 7, 7a ... Cylinder 71 ... Outer end surface 8 ... Occlusion body 81 ... O-ring 82 ... Oil plug 9 ... Connecting member 91 ... O-ring 92 ... Recess 10 DESCRIPTION OF SYMBOLS ... Pump block 101 ... Drive shaft 11 ... Battery support part 12 ... Battery 121 ... End surface 13 ... Grip part 14 ... Discharge adjustment operation part 15 ... Motor 500 ... Lock bolt loading test apparatus 501 ... Ground mountain 502 ... Embedded surface 503 ... Lock Bolt 504 ... Connecting material 505 ... Center hole jack 506 ... Reaction force plate 507 ... Angle adjustment base 508 ... Angle adjustment ball seat 509 ... Hydraulic hose 510 ... Pressure signal generating unit 511 ... Transmitter 512 ... Recording display unit 513 ... Magnet stand 514 ... Displacement signal generating unit 515 ... Square washer 200 ... Loading test device 201 ... Ground mountain 202 ... Rock bolt 203 ... Shotcrete 204 ... Secondary lining concrete DESCRIPTION OF SYMBOLS 205 ... Tunnel space 300 ... Loading test apparatus 301 ... Structure 302 ... Bolt 303 ... High place work table 400 ... Loading test apparatus 401 ... Inclined land 402 ... Anchor 403 ... Scaffolding

Claims (7)

It has an oil discharge port, a metal and hollow box,
A rubber tank that is provided at a side of the box and communicates with the box to form a pressure oil storage space therein;
A pump block that is provided at an upper portion of the box and discharges the pressure oil in the pressure oil storage space from the oil discharge port by electric drive;
An electric hydraulic pump comprising: a discharge adjustment operation unit capable of adjusting a discharge amount of pressure oil by adjusting a drive amount of a drive shaft of the pump block in conjunction with a movement amount. The box is substantially rectangular in shape,
The electric hydraulic pump according to claim 1, wherein a cylindrical body that covers the rubber tank is provided, and a battery support portion to which a battery is mounted is provided at a position corresponding to the cylindrical body. A grip is provided between the pump block and the battery support,
3. The electric hydraulic pump according to claim 2, wherein the discharge adjustment operation portion in a trigger shape is provided on the pump block side of the grip portion.   The electric hydraulic pump according to claim 2 or 3, wherein the cylinder is detachably attached to the box.   The electric hydraulic pump according to any one of claims 2 to 4, wherein the battery mounted on the battery support portion is provided with an end face that is substantially flush with an outer end face of the cylindrical body. An opening is provided at a position different from the position at which the rubber tank is provided at the side of the box,
The opening is closed with a removable closing body,
2. With the closed body removed, another rubber tank that communicates with the box through a connecting member and forms a pressure oil storage space therein can be connected to the opening. The electric hydraulic pump in any one of -5. A stabilization embedding loading test apparatus comprising the electric hydraulic pump according to any one of claims 1 to 6,
A center hole jack that loads the pulling force on the protruding portion from the embedded surface of the stabilizing embedded material or on the connecting material connected to the protruding portion;
A stabilization embedding load test apparatus comprising the electric hydraulic pump that hydraulically drives the center hole jack.

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