JP2530567Y2 - Pulling machine for ground survey rod - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention relates to a drawing machine used to pull out a rod driven into the ground in order to investigate the hardness of soil serving as a ground.

[Prior Art] As a measurement method for investigating the hardness of soil serving as the ground, a rod having a conical head attached to the tip was used, and the tip was set upright toward the surface of the ground, and attached to the rear end of the rod. Drop a weight of a certain weight from the predetermined height on the seat and give an impact, measure the depth of the rod sinking in the ground,
There is a technology that uses this as an index of soil hardness. In this measuring method, the weight is repeatedly dropped to push the rod into the ground, and the hardness of the soil at each depth is sequentially sampled.

When a rod having a predetermined length is buried in the ground over substantially the entire length, a rear end seat is removed, a next rod is added, and the added rod is driven and sampled to perform a required measurement. Go on.

In this way, it is customary to measure the hardness of the soil over a depth of about 7 m from the surface of the ground while adding three to four rods one after another.

When the above measurement is completed, as a subsequent process, it is necessary to pull out a rod that has been driven deep into the ground, and in this pulling, conventionally, the following means have been used.

That is, the rod portion projecting from the ground surface is sandwiched between the two blocks to be screwed together, and the screw is tightened.
Secure rods between blocks. Next, a method of engaging a head of a manual jack such as a screw jack or a hydraulic jack with the block and operating the jack to pull up the block has been adopted in which a rod is pulled out from the ground together with the block. .

[Problem to be solved by the invention] However, in the conventional means using such a jack, since the lift of the jack is limited, the jack is operated to lift the block to the upper limit of the jack. , Loosen the screw of the block, release the block from the rod, lower the jack head again and return it to the lower limit position, then pinch the block near the surface of the rod and replace it at that position Then, the rod was tightened again to clamp the rod, and the block was fixed to the rod again, whereby the jack had to be repeatedly operated to pull out the rod remaining in the ground.

Therefore, when the rod is deep in the ground, the operation has to be repeated many times, which is extremely complicated and inefficient.

In addition, each rod has a curl at the seam due to the impact when it is driven, and since this part is larger in diameter than the rod's original diameter, the screws of the block must be loosened sufficiently and the gap between the blocks Without opening the, the block could not be moved along the rod while the rod was inserted through the block.

Such a screw tightening operation on the block also increases the complexity of the operation and is inconvenient.

Also, since the jack itself is quite heavy, it is not easy to carry it with other measuring instruments.

SUMMARY OF THE INVENTION An object of the present invention is to provide a rod extractor that can be operated with a very simple and repetitive operation when extracting a rod that has been driven into the ground to check the hardness of the soil.

[Means for Solving the Problems] In order to solve the above problems, in a rod extracting machine according to the present invention, a base provided with a shaft serving as a fulcrum at a predetermined height on the ground surface, As a main body, a rod that is supported so as to be able to move up and down, and a rod clamp member that is supported by a shaft at the point of action of the rod and that moves up and down on a vertical line, and the rod clamp member in this main body is a frame A pair of clamp blocks attached to the body and holding the rods to be pulled out from opposite sides,
A spring member arranged between the frame body and the clamp block, for urging the rod clamped by the pair of clamp blocks in a direction to squeeze the rod, between the opposing surfaces of the pair of clamp blocks mounted on the frame body; An operating plate for increasing the distance between the frame and a part of the frame body, the rotation of which drives the operating plate and pushes the opposing clamp block against the urging force of the spring member. An operating lever that opens, wherein the clamp block responds to the lowering of the rod clamp member when the rod clamp member descends, releasing the pinching force on the rod irrespective of the urging force of the spring member. When the rod rises, the pinching force on the rod is increased by a force adapted to the force applied to the point of force of the roller.

Also, as another solution, the above-mentioned pedestal,
In the configuration mainly composed of a rod clamp member, a pair of eccentric circular cam surfaces interlocking with each other are formed on a clamp block in place of an operation plate for relaying an operation with respect to the rod clamp member, and the rods are mutually connected by these cam surfaces. It is also proposed that the operation lever is integrally extended from the clamp block having the eccentric arc cam surface while being clamped from the opposite side, and the interval between the clamp blocks is pushed open by turning the operation lever. I do.

In any of these cases, it is desirable that the gantry and the ram are made of a steel plate and a steel pipe, respectively.

[Operation] Since the rod puller according to the present invention is configured as described above, if the operating lever for release / clamp is manually operated to release the clamp block, the rod protruding from the ground surface can be obtained. , The clamp block can be easily inserted, and the pedestal base can be easily installed on the ground.

In this state, if the power point of the tiller is moved up and down by hand, the rod clamp member attached to the action point moves up and down accordingly. In this vertical movement, when the rod clamp member descends, the frictional force of the sliding contact with the rod expands the gap between the clamp blocks and mechanically releases the rod, so that the clamp block can easily descend along the surface of the rod. Conversely, when the rod clamp member is lifted, the frictional force of pressing the rod with the rod acts to press the clamp block against the rod, and cooperates with the spring member to clamp the rod. It rises with the member and is easily pulled out from the ground. Therefore, the rod is raised little by little and pulled out simply by repeatedly raising and lowering the power point of the roller manually.

In addition, the swollen enlarged part of the rod top due to the impact,
By operating the manual operation lever for release / clamp to increase the distance between the clamp blocks, the clamp position can be easily changed by passing through the clamp block.

[Embodiment] Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

FIG. 1 is a front view of a drawing machine according to a first embodiment of the present invention. In FIG. 1, reference numeral 10 denotes a ground survey rod composed of a rod 11 which is extended and has a conical head 15 underground. And the portion of the seam 18 that adds the rod 11b with the screw portion 19,
The ground surface 1 is shown in cross section. In this figure,
Reference numeral 13 shown by a two-dot chain line is a seat,
When pulling out 10, the rod clamp member 40 is removed because it interferes with the engagement.

Numeral 17 indicates a diameter-enlarged portion caused by bending generated at the top end portion of each rod due to a hit at the time of driving.

Reference numeral 20 denotes a base for a roller 30 which includes a substrate 21 fixed on the ground surface,
And a support 23 for supporting a shaft 31 as a fulcrum of the roller 30 at a predetermined height from the ground.

Reference numeral 33 denotes a trunk of the roller 30 which is made to be able to be raised and lowered around a shaft 31 as a fulcrum. At one end of the trunk 33, a shaft 37 is provided as an action point, and at the other end, an operating rod is provided. 35 are welded. By inserting the steel pipe 39 through the operation rod 35, the point of force operated by hand is set at a position away from the fulcrum, and a large operating moment can be obtained with a small force.

The rod clamp member 40 is pivotally supported by a shaft 42 of a link arm 43 that is swingably suspended from a shaft 37 as an action point provided at the tip of the roller 30.

Reference numeral 60 denotes an operation lever for manually releasing and fastening a clamp block 48 described later.

2 and 3 show the detailed structure of the relationship between the rod clamp member 40 and the operation lever member 60. FIG. In FIG. 2, the front plate 49 of the rod clamp member 40 shown in FIG. 1 is removed and shown, and the internal mechanism is enlarged for easy understanding.

The frame body 41 is a link plate that is arranged in upper and lower two stages facing each other.
Clamp blocks 48,48 supported on 46,46, ...
And a coil spring 44 for urging the same downward, and an operating plate 53 for operating the clamp blocks 48, 48, and are pivotally supported by a shaft 42 with respect to a link arm 43. The front plate 49 and the rear plate 50 sandwich the front and rear surfaces in a closed state, and are integrally formed.

The link plates 46, 46,...
.. Provided on the frame 41, and two pairs of parallel link mechanisms are formed using the pins 47, 47... Provided on the clamp blocks 48, 48 as pivot points. Pins 47, 47 ……
Are respectively in contact with the upper and lower slopes 55, 55,... Of the operation plate 53, and slide along the slopes.
When the operating plate 53 is lifted and moved, the pin 4
7,47 ... slides along the slopes 55,55 ...
Are rotated to be long, and the operating plate 53 expands the mutual interval between the pins 47, 47,..., Whereby the link plates 46, 46
... move around the pins 45, 45 at the same time.

In response to this operation, the clamp blocks 48, 48 move upward while keeping parallel to each other, and increase the distance between them. Conversely, when the operating plate 53 is moved downward, the clamp blocks 48, 48 are urged downward by the coil springs 44.
The distance between the clamp blocks 48, 48 is narrowed while moving downward while maintaining parallel to each other.

As is apparent from the side view of FIG. 3, an L-shaped operating lever 51 is fixed to the operating plate 53, and one side of the L-shaped operating lever 51 is provided on the front plate 49. It is configured to protrude outward from the hole 57 so that it can be externally operated by the operation lever 60.

FIG. 3 is a side view taken along a line III-III in FIG. 2, and shows a state in which a front plate 49 is attached.

In FIG. 3, reference numeral 61 denotes a rod which pushes up the outer end of the operating lever 51, which protrudes outward from the front plate 49 through the elongated hole 57, by an operating lever 68, and the operating lever 68 is a crank lever. It is linked through 65. 63, 64 and 67
Indicates a pin for forming a crank connection. When the operation lever 68 is rotated in the direction of arrow A around the pin 64 on the frame 66 attached to the front plate 49, the pin
Since 67 rotates in the same direction about the pin 64, the crank lever 65 and the pin 63 are the guides in which the rod 61 is inserted.
Under the guidance of 62, the rod 61 is linearly moved upward. By this movement, the upper side of the operation lever 51 is pushed up by the rod 61. When the operating lever 68 is rotated in the reverse direction to return to the state shown in FIG. 3, the rod 61 is lowered, and the operating lever 51 is moved by the clamp blocks 48, 48 under the bias of the compressed coil spring 44. At the same time, it returns to the position shown in FIG.

The operation of each part in the drawing machine of the present invention having the above-described structure will be described below together with the operation for drawing the rod.

The operation lever 68 is rotated in the direction of the arrow A in FIG. 3 to open the gap between the clamp blocks 48, 48, and the clamp block 48 is released from the rod 11. In this way, the portion of the rod 11 protruding from the ground surface is inserted between the clamp blocks 48, 48 with a large gap therebetween, and the gantry 20 is set at a predetermined position after the insertion.

The rod clamp member 40 is disposed as close to the surface of the rod 11 as possible, the operating lever 68 is returned to the old position, and the clamp blocks 48, 48 are left to the biasing force of the coil spring 44. The diameter of the inner surface where the clamp blocks 48 and 48 come into contact with the rod 11 is manufactured in advance so that the diameter of the rod 11 and the fit of the interference fit are established, and the surface thereof is provided with a tooth shape. With the biasing pressure of 44 and the cooperation of the two pairs of parallel link mechanisms, the clamping block 4
The inner surface of 8,48 will clamp the surface of the rod 11 firmly.

After performing this setting, when the end of the steel pipe 39 serving as the emphasis point of the roller 30 is pushed down, the rod clamp member 40
However, the more the parallel link mechanism of the clamp locks 48 and 48 cooperates with the contact friction with the rod 11 and becomes more self-tight, and the greater the resistance of the rod 11 to withdrawal, the more the clamp blocks 48 and 48 become As a result, the rod 11 is strongly tightened, and the rod 11 is
Rise with.

Then, on the contrary, the pipe 39 which is the emphasis of the
When the end of the rod is lifted, the rod clamp member 40 descends, and the parallel link mechanism of the clamp blocks 48, 48 loosens the contact relationship with the rod 11, thereby acting loosely. Releases the rod 11. Therefore, the rod clamp member 40
The rod 11 is lowered while keeping the rod 11 in that position.

In this way, the rod clamp member 40 simply moves up and down in response to the mere vertical movement of the pipe 39 manually, but the clamp blocks 48 and 48
Along with this, when the rod 11 descends, the rod 11 is released and descends, and when the rod 11 rises, the rod 11 is tightened with a strength corresponding to the pull-out resistance of the rod 11 and rises repeatedly. Therefore, by the operation of raising and lowering the operation rod 35 attached to the steel pipe 39, the rod 11 is pulled out from the ground sequentially while repeating inching.

FIG. 4 is a schematic front view showing a drawing machine as a different embodiment of the present invention.

In the drawings, members common to the first embodiment are denoted by the same reference numerals as in FIG.

In this different embodiment, the positions of the shaft 31 serving as the fulcrum of the roller 30 and the shaft 37 serving as the application point are interchanged. Therefore, in this case, the operation is exactly the same as that of the above-described embodiment except that the operation direction of the force point and the operation direction of the action point are respectively the same direction, contrary to the above-described embodiment. I can say that. That is, the raising of the operation rod 35 causes the rod to be pulled out, and the holding of the rod to be pulled out by the downward movement is lost, and the position of the rod clamp member 40 is changed.

FIG. 5 shows a rod clamp member 70 according to a second embodiment in which a structural change is added to the rod clamp member, and a part of a front plate 79 is cut away to show the details.

In FIG. 5, reference numerals 78 and 78 denote clamp blocks, and these clamp blocks 78 are provided on the inclined surfaces 7 provided on the frame 71, respectively.
The surface facing the rod 11 in sliding contact with 6, 76 moves in parallel, and is urged downward by the coil spring 74 in the same manner as in the first embodiment. As a result, as the clamp blocks 78, 78 move downward relative to the frame 71, the rod 1
On the other hand, the rod clamp member acts as a tightening member, and conversely, the upward movement loosens and acts the same as the rod clamp member 40 of the first embodiment. Pins 77, 77 are implanted in the clamp blocks 78, 78.
Above, it protrudes outward from the symmetrically arranged oblong holes 75, 75 parallel to the inclined surfaces 76, 76, respectively, and furthermore, each end thereof is formed by a long hole 85 provided horizontally on the operation plate 83. , 85. As for the operation plate 83, the pin 81 implanted therein is engaged with the elongated hole 92 provided in the longitudinal direction of the operation lever 98. Since the operating lever 98 is pivotally supported on the pin 94 implanted in the front plate 79 and is rotated about the pin 94, when the operating lever 98 is rotated in the direction of arrow B, The engaging pin 81 will lift the working plate 83.

Due to this rise of the operating plate 83, the pins 77, 77 on the clamp blocks 78, 78 that engage with the slots 85, 85 are obliquely inserted into the slots 75, 75.
Lifted while being guided by the clamp block 78,7
8 will move upward while increasing its facing distance. When the operating lever 98 is returned to the position shown in FIG. 5, the clamp blocks 78 are moved by the urging force of the coil spring 74.
It descends along the slope surfaces 76, 76 while reducing the facing distance.
The rod clamp member 70 configured as described above has a first
The operation is exactly the same as the rod clamp member 40 described in the embodiment.

FIG. 6 shows a third embodiment of an engaging and disengaging mechanism for a pull-out rod which operates in association with the operation of the operating lever.

Reference numeral 100 in the drawing indicates another example of the rod clamp member, and in FIG. 6, the front plate is removed. In this example, the clamp blocks 108, 108
Is constituted by the structure of an eccentric arc cam, the side surface of which contacts the rod 11 to be withdrawn has a drum shape, and the gears 106,
It has an integral structure with 106, each of which is pivotally supported by a shaft 105, 105 and moves in conjunction with each other via gears 106, 106 meshing with each other. These shafts 105, 105 are supported between a front plate and a rear plate 109 (not shown), and one clamp block 108 is provided with an operating lever 128 integrally protruding therefrom. 127 and frame 101
The operation lever 128 is constantly urged in the direction of the arrow C by suspending the coil spring 104 between the pin 124 and the pin 124 implanted in the control lever 128. In this configuration, if the operation lever 128 is turned in the direction opposite to the arrow C, the gears 106 are engaged with each other, so that the clamp blocks 108 and 108 move the shaft 10 toward the direction in which the eccentric surfaces of the respective opposed cams are separated from each other.
It rotates around 5,105. When the operating lever 128 is restrained in the direction of returning to the position shown in FIG. 6, the gears 106, 106, under the tensile biasing force of the coil spring 104, have their eccentric opposing surfaces of the clamp blocks 108, 108 integrated with the gears 106, 106 narrowed, When the rod clamp member 100 is raised in this state,
Since the eccentric arc cam surfaces of the clamp blocks 108 and 108 try to roll the surface of the rod 11 by friction, the eccentric arc cam surface acts in a direction to narrow the opposing surface of the eccentric arc cam, and a rotating power corresponding to the pull-out resistance force of the rod 11 is generated. When it occurs, the rod 11 is strongly clamped.

Conversely, when the rod clamp member 100 is lowered, the eccentric circular cam surfaces rotate in the directions to expand the opposing surfaces, respectively, due to friction with the surface of the rod 11, thereby releasing the clamping force by the clamp buff locks 108,108.

In this manner, the rod clamp member 100 can operate in exactly the same manner as the rod clamp member 40 described in the first embodiment.

[Effects of the Invention] As described above, in the rod pulling machine according to the present invention, the rod clamp member for clamping the rod is provided at the point of application of the ram. When the rod is released, and conversely, when ascending, it exerts the tightening force on the rod in response to this operation. Can be easily pulled out.

In addition, since the operation lever for manually releasing and clamping is provided, the attachment and detachment of the rod is easy, and it is possible to cope with a large-diameter portion caused by a hit at the time of driving by a simple operation.

Further, if the gantry and the core are made of a thin steel plate and a steel pipe, respectively, the weight can be reduced and the carrying and relocation can be facilitated.

[Brief description of the drawings]

FIG. 1 is a front view of a first embodiment of the rod puller of the present invention, and FIG. 2 is a front view of the rod puller of FIG. FIG. 3 is a side view taken along line III-III of FIG. 2, FIG. 4 is a front view of another embodiment of the rod puller of the present invention, FIG. FIG. 5 is a front view showing a second embodiment of the rod clamp member according to the rod puller of the present invention. FIG. 6 is a diagram showing a third embodiment of the rod clamp member according to the rod puller of the present invention. It is a front view. 10… Rod for ground survey, 20… Base 30… Rod 40,70,100… Rod clamp member 44,74,104… Coil spring 48,78,108… Clamp block 53,83… Working plate 60,98,128… … Operation lever

Claims (2)

(57) [Scope of request for utility model registration] 1. A gantry having a shaft serving as a fulcrum at a predetermined height on the ground surface, a pallet pivotally supported on the fulcrum as a fulcrum, and supported by a shaft at a point of application of the pallet. And a rod clamp member that moves up and down on a vertical line. The rod clamp member is mounted on a frame, and a pair of clamp blocks that clamp the rods to be withdrawn from opposite sides. A spring member arranged between the clamp block and the pair of clamp blocks for urging the rod held by the pair of clamp blocks in a direction to squeeze the rod, and increasing a gap between opposing surfaces of the pair of clamp blocks mounted on the frame. And an operating lever that is pivotally supported by a part of the frame body, drives the operating plate by its rotation, and pushes the opposing clamp block against the urging force of the spring member. To When the rod clamp member is lowered, the clamp block responds to the descent of the rod clamp member to release the pinching force on the rod regardless of the urging force of the spring member. A ground survey rod pulling machine, characterized in that the pinching force on the rod is increased by a force adapted to the force applied to the power point of the ram. 2. A gantry having a shaft serving as a fulcrum at a predetermined height on the ground surface, a pallet pivotally supported on the fulcrum as a fulcrum, and supported by a shaft at a point of application of the pallet. And a rod clamp member that moves up and down on a vertical line. The rod clamp member is mounted on a frame, and clamps a rod to be withdrawn from opposite sides, and a pair of eccentric arc cams that interlock with each other. A clamp block having a surface, a spring member arranged between the frame body and the clamp block, and a spring member for urging a rod held by the pair of clamp blocks in a direction to squeeze the rod; and a spring member mounted on the frame body. In order to increase the distance between the opposed cam surfaces of the pair of clamp blocks, provided integrally with the clamp block, against the urging force of the spring member,
A rotatable operating lever that pushes the gap between the opposing clamp blocks. The clamp block responds to the lowering of the rod clamp member when the rod clamp member descends, regardless of the urging force of the spring member. Releasing the pinching force on the rod, and increasing the pinching force on the rod with a force adapted to the force applied to the point of force of the rod when the rod clamp member is raised. Drawing machine.