JP2014012983A - Rod pull-out device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rod pull-out device capable of easily holding and removing a rod.SOLUTION: A rod pull-out device 1 comprises: a pair of links 7, 8; a swing rod for raising and lowering the links 7, 8; and multiple holding plates 9 which are rotatably attached on each of the links 7, 8. The rod pull-out device 1 is constructed so that when the links 7, 8 are raised with a rod 30 inserted into a guide hole 9a formed on the holding plate 9, the holding plate 9 rotates and both opening edges of the guide hole 9a contact an outer peripheral surface of the rod 30, which allows the holding plate to hold and raise the rod. The guide hole 9a of the holding plate 9 has an opening on a side. As inserting a rod from an opening 9b allows the rod 30 to be held by or removed from multiple holding plates 9 simultaneously, holding and removing of the rod 30 become easy.

Description

  The present invention relates to an apparatus for pulling out a rod penetrating into the ground in ground investigation.

  Conventionally, prior to the construction of various buildings, geological surveys up to a predetermined depth have been conducted in order to know the hardness of the site. In this geological survey, a boring test using a large boring excavator is applied to a large-scale building, but it is cheap when building a relatively small-scale building such as a house. Swedish sounding test methods are used to provide the necessary data easily. This Swedish sounding test method applies a load to a rod with an approximately conical excavation body called a screw point attached to the tip and penetrates into the ground while rotating as necessary. This is a test for measuring the load at that time and the number of half rotations of the rod during that time (the number of rotations of the rod counted with the rod half rotation as 1). In this test, the rod is successively added until the excavated body at the tip reaches a desired depth and penetrates into the ground. After the test is completed, the rod is pulled out from the ground and repeatedly used.

  Further, when pulling out the rod, a rod pulling device shown in Patent Document 1 is used. This rod pull-out device is composed of a swinging bar member swingably supported by a support base and a rod holding part attached to the tip of the swinging bar member. The rod holding portion includes a pair of links pivotably connected to a swing bar, a plurality of holding plates rotatably attached to the links, and a holding plate and a holding plate of the pair of links. Each holding plate is alternately connected so that the holding plate of the other link is interposed therebetween, and each holding plate is configured to rotate at the same time. In addition, the holding plate is formed with guide holes that can be aligned on the same center line by rotating the holding plates all at once, and inserting the rod into the guide hole allows the rod to be pulled out. Installing.

Japanese Patent No. 2751046

  However, the guide hole of the holding plate has a shape in which only the flat surface and the bottom surface are opened, and in order to insert the rod into all the holding plates, the guide hole has to be passed through from the upper end of the rod in order. For this reason, it took time and effort to attach the rod to the extraction device.

  An object of the present invention is to provide a rod pulling device that can easily attach and detach a rod.

  It is provided with a pair of links, lifting means for raising and lowering the links, and a plurality of holding plates rotatably attached to the links, and the links are inserted with the rods inserted into the guide holes formed in the holding plates. In the rod pulling device configured to be lifted while holding the rod by rotating the holding plate and causing both opening edges of the guide hole to contact the outer peripheral surface of the rod when lifted, the guide hole of the holding plate Is based on a rod pulling-out device characterized in that the side surface has a shape opened.

  According to the present invention described above, since the side surface of the holding plate is partially opened, a plurality of holding plates can be attached to and detached from the rod simultaneously from the lateral direction of the rod by passing the rod through the opening. Therefore, the rod can be easily attached and detached.

It is a front view of the rod extraction apparatus which concerns on this invention. It is a left view which shows the principal part of the rod extraction apparatus which concerns on this invention. It is operation | movement explanatory drawing of the rod extraction apparatus which concerns on this invention. It is the sectional view on the AA line in FIG. It is explanatory drawing which shows the force which acts on a holding | maintenance plate.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, in order to clarify the configuration and operation of the rod pulling apparatus of the present invention, a Swedish sounding penetration test method (hereinafter simply referred to as a penetration test method) in which a rod is penetrated into the ground to perform a geological survey will be described. In this penetration test method, a rod 30 having an excavation body called a screw point attached to the tip is penetrated into the ground in a state perpendicular to the ground surface, and predetermined data is collected every time it penetrates 250 mm. The rods 30 are successively inserted until the excavated body at the tip reaches a desired depth. In this penetration test method, the rod 30 is basically penetrated only by a load that is increased or decreased in units of 245N from 245N to 980N, and is penetrated by rotation only when it cannot penetrate only by a load of 980N. Further, the collected data are the number of half rotations of the rod 30 during the penetration of 250 mm (the number of rotations counted with the half rotation of the rod 30 as 1) and the load applied to the rod 30 at that time. After the test is completed, these data are organized to determine the geology.

  The rod pulling device 1 of the present invention is used for pulling out the rod 30 that has been deeply penetrated by the penetration test method, and its configuration and operation will be described in detail below. In FIG. 1, reference numeral 1 denotes a rod pulling device, which is a column 2 b erected on a substrate 2 a, a swinging bar 3 that is swingably supported by the column 2 b, and a tip of the swinging bar 3. The rod holding portion 4 is attached, and the rod holding portion 4 is moved up and down by swinging the swinging rod 3, and the rod 30 held by the rod holding portion 4 is pulled out. ing. An example of the lifting means described in the claims is the swing member 3.

  A fitting member 5 provided with three recesses 5a at equal intervals is integrally attached to the tip of the swing bar 3 and any one of these recesses 5a is selected and fitted to the upper end of the column 2b. By combining, the rocking bar 3 can be swung around the portion as a fulcrum. Further, a substantially U-shaped connecting portion 3a is integrally provided at the tip of the swinging bar 3, and a refractable chain member 6 as an example of a hanging member is swingable on the connecting portion 3a. It is connected to. The chain members 6 are respectively provided at the branch ends of the connecting portions 3a, and the rod holding portions 4 are swingably attached to the tips thereof. In addition to the chain member 6, the hanging member is a linear member such as a rope or a wire, or a plate member having one end connected to the connecting portion 3 a and the other end connected to the rod holding portion 4 so as to be swingable. Also good.

  As shown in FIGS. 2 and 3, the rod holding part 4 is connected to a pair of links 7 and 8 respectively connected to the tip of the chain member 6, and the links 7 and 8 are spaced two times at equal intervals. A link mechanism that has a holding plate 9 that is movably connected, and a connecting plate 10 that rotatably connects these holding plates 9 together, and each part of the links 7 and 8, the holding plate 9, and the connecting plate 10 is interlocked. It is comprised so that. The links 7 and 8 are each composed of two plates and are supported with a holding plate 9 interposed therebetween. Further, the connecting plate 10 has a holding plate 9 for the link 7 so that the holding plate 9 attached to the other link 8 is always interposed between the holding plate 9 attached to the one link 7 and the holding plate 9. And the holding plate 9 of the link 8 are connected alternately. Therefore, the connecting portion between the holding plate 9 and the links 7 and 8 has a staggered shape. Further, the holding plate 9 is provided with a guide hole 9a therethrough, and as shown in FIG. 3, these guide holes 9a are located at positions where each holding plate 9 forms a right angle with respect to the links 7 and 8. Are arranged so as to be aligned on the same center line. Thus, the operation of leveling the holding plate 9 can be executed by manually lifting the connecting plate 10 upward, and is used when the rod 30 is attached to and detached from the guide hole of the holding plate 9.

  As shown in FIG. 4, the guide hole 9a of the holding plate 9 has a shape in which not only a plane and a bottom surface but also a left side surface is opened. By providing the opening 9b, a plan view and a bottom view are provided. The outline of the guide hole 9a is U-shaped. With this configuration, the rod 30 can be inserted into the guide hole 9a of the holding plate 9 from the lateral direction, and the rods 30 can be attached to all the holding plates 9 at a time.

  When the rod 30 that has penetrated deep into the ground by the penetration test is pulled out by the rod pulling device 1, first, the support base 2 is installed in the vicinity of the rod 30 projecting to the ground surface, and the desired recess of the fitting member 5. The swing bar 3 is mounted by fitting 5a to the upper end of the support 2b. Subsequently, the connecting plate 10 is lifted so that the guide holes 9a of the holding plates 9 are located on the same straight line. In this state, the extraction device 1 is moved forward to insert the rod 30 into the guide hole 9a of the holding plate 9 from the lateral direction. When the connecting plate 10 that has been lifted is released, each holding plate 9 rotates with respect to the links 7 and 8 until the upper and lower edges of the guide hole 9a contact the rod 30 as the connecting plate 10 drops. Move and tilt. Thereafter, when the swing bar 3 is swung in the direction in which the rod holding portion 4 is lifted, the links 7 and 8 are lifted with respect to the connecting plate 10, so that the friction of the contact portion between each holding plate 9 and the rod 30 is increased. The force increases and the rod 30 can be held and pulled out.

  When the rod 30 is pulled out as described above, as shown in FIG. 5, a horizontal force F acts on the contact point between the holding plate 9 and the rod 30 by the force T pulling up the links 7 and 8. In a state where the rod is held, the force F becomes a force for pinching the rod, so that the rod 30 can be pulled out from the ground.

  On the other hand, when the swing bar 3 is swung in the direction in which the rod holding portion 4 is lowered, the force F applied to each holding plate 9 is released by the lowering of the links 7 and 8. The rod 30 pulled out from the ground can be removed from the opening 9b of the holding plate 9.

  According to the rod pulling device 1, since the left side surface of the holding plate 9 is partially open, the rod 30 can be attached to and detached from each holding plate 9 simultaneously by passing the rod 30 through the opening 9b. It becomes. For this reason, it is not necessary to remove the rod 30 from all the holding plates 9 by moving the rod 30 in the vertical direction as in the conventional pulling device, and the rod 30 can be easily attached and detached.

DESCRIPTION OF SYMBOLS 1 Pull-out apparatus 2a Board | substrate 2b Support | pillar 3 Oscillating rod 4 Rod holding part 5 Fitting member 5a Recess 6 Chain member 7, 8 Link 9 Holding plate 9a Guide hole 9b Opening part 10 Connecting plate 30 Rod

Claims (1)

It is provided with a pair of links, lifting means for raising and lowering the links, and a plurality of holding plates rotatably attached to the links, and the links are inserted with the rods inserted into the guide holes formed in the holding plates. In the rod pulling device configured to lift the rod while holding the rod by rotating the holding plate and causing both opening edges of the guide hole to contact the outer peripheral surface of the rod,
The guide hole of the holding plate has a shape in which a side surface is opened.

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