JP4566254B2 - Ground improvement measuring device - Google Patents

Description

  The present invention relates to a measuring apparatus for measuring a ground improvement body such as a columnar column formed in the ground.

  Generally, when building a general house or the like, after checking the hardness of the ground which is the foundation in advance, if the ground is soft, a columnar column made of concrete is formed in the ground before the building is built. Hereinafter, a method of work in each step and instruments and devices used at that time will be described.

  First, when conducting a ground survey, for example, a Swedish sounding tester is used for the survey. As shown in FIG. 4, the Swedish sounding tester 1 is used when a plurality of rods 11, screw points 12 attached to the tips of the rods 11, and the screw points 12 penetrate into the ground. A weight body 14 and a handle 15 for rotating the screw point 12 in the ground are provided. When inspecting using this tester, first, the screw point 12 attached to the tip of the rod 11 is set up vertically with respect to the ground, and the rod 11 is penetrated by 25 cm. Then, the number of rotations of the handle 15 necessary for penetrating the screw point 12 by 25 cm is recorded, the screw point 12 is penetrated to a specified depth, and the hardness of the ground is determined based on the record of the number of rotations. taking measurement.

  If it is determined that the ground needs to be reinforced based on such ground survey, a columnar column or the like is formed on the ground to reinforce the ground.

  When this columnar column is formed, a stirring excavator 6 as shown in FIG. 5 is used. The agitation excavator 6 includes an excavation shaft 61 having a hollow portion for discharging solidified slurry along the axial direction, and an excavation blade 62 attached to the lower end side of the excavation shaft 61 and excavating the ground. The agitating blade 63 that rotates together with the excavating blade 62 and a common rotation preventing blade 64 that is freely attached to the excavating shaft 61 between the excavating blade 62 and the agitating blade 63 are provided. . And when forming a columnar column using this stirring excavation device 6, excavation axis 61 is stood in the position to excavate, and excavation is carried out while rotating excavation axis 61 in one direction. At this time, the solidified material slurry is discharged from a discharge port (not shown) provided near the tip simultaneously with the rotation, and when reaching a predetermined depth, the excavation and discharge of the solidified material slurry are stopped, and this time, the reverse direction The solidified material slurry and the soil are kneaded and rotated while rotating.

  By the way, when such a columnar column is formed, bubbles and soil blocks may be mixed in the column. For this reason, conventionally, a measuring device for inspecting whether or not bubbles or soil blocks are mixed in the columnar column has been used.

  As this measuring apparatus, for example, as shown in Patent Document 1 (FIG. 6), one long rod 7 inserted into a columnar column and a plurality of rods arranged on the outer peripheral surface from the lower end to the upper end of the rod 7 are used. These electrode bodies 71 are configured to be inspected, and the formation state of the columnar column can be inspected by the specific resistance based on the energized state between these electrode bodies 71.

Moreover, what is shown in patent document 2 is proposed as a thing regarding such a measuring apparatus. As shown in FIG. 7, this measuring device is attached to the tip of the excavation shaft 61 of the agitation excavator 6, and after the excavation and agitation shown in FIG. In addition, the stirring blade 63 is removed and replaced with the measuring device 72 so that the formation state of the columnar column 5 can be inspected.
JP 2000-46510 A Registration 3931798

  However, in such a measuring apparatus, as shown in FIG. 6, in the method using one long rod, the electrode bodies must be provided at regular intervals from the lower end to the upper end of the columnar column. Is expensive and expensive. In addition, it is difficult to store and carry, and there is a problem that the maximum length of the columnar column that is assumed must be set.

  On the other hand, the measuring apparatus as shown in FIG. 7 requires only a small number of electrode bodies attached to the tip of the excavation shaft, and is easy to store and carry.

  However, since the measuring apparatus shown in FIG. 7 is installed by exchanging with excavating blades, an operation of removing several tens of kg of excavating blades and stirring blades is added. In addition, after excavation, the slurry adheres to the excavation blades, so that the slurry may adhere to clothes during the replacement operation. In addition, since the excavation shaft is configured to be thick, there is a high possibility that bubbles are generated when the drill shaft is inserted into or extracted from the columnar column. Furthermore, since the measuring device is penetrated using heavy machinery, for example, in order to penetrate the measuring device in increments of 25 cm, there is a problem that considerable skill is required for operation of the heavy machinery.

  Accordingly, the present invention provides a measuring apparatus that can use an apparatus used at a construction site or the like while paying attention to the above-described problems, and that can easily and inexpensively check the formation state of the ground improvement body. For the purpose.

That is, in order to solve the above-described problems, the present invention is attached to a plurality of rods connected in the axial direction, a screw point that is detachably attached to the distal end side of the rod, and the vicinity of the rear end side of the rod. A ground improvement body measuring device using a Swedish sounding tester comprising a weight body, wherein the connecting portion is attached to the tip side of the rod so as to be replaceable with the screw point, and has the same outer dimensions as the rod has the same length as the screw point there is, Rutotomoni includes a plurality of electrode bodies at regular intervals, the obliquely upward to the electrode body to form a recess having a cut oblique to the boundary portion between the rod comprising a body for leading out an electrode wire, a, to measure the state of formation of an improved body formed ground by the resistivity between the electrodes provided body to the main body One in which the.

In this way, it is possible to measure the formation state of the ground improvement body using the rod of the Swedish sounding tester used at the construction site, so there is no need to prepare a special long rod. Can finish the equipment at low cost. Moreover, since only the part which replaces a screw point needs to be stored, storage and transportation are also prepared. Furthermore, as shown in FIG. 7, there is no need to remove heavy objects such as a drilling shaft and a stirring blade, and measurement is performed manually at a predetermined pitch (for example, 25 cm) without using a heavy machine. Will be able to go. In addition, since the electrode wire can be derived obliquely from the axial direction, it is possible to reduce the resistance applied to the electrode wire when penetrating the measuring device. Even if resistance is applied, the weight used in the Swedish sounding tester can be used, so that the penetration work can be facilitated.

As described above, according to the present invention, the plurality of rods connected in the axial direction, the screw point detachably attached to the tip end side of the rod, and the weight attached to the vicinity of the rear end side of the rod. A ground improvement body measuring device using a Swedish sounding tester, comprising: a connecting portion attached to the tip side of the rod so as to be replaceable with the screw point; and the same outer dimensions as the rod, It has the same length as the screw point, deriving electrode lines obliquely upward to the electrode body to form a recess having a cut oblique at the boundary Rutotomoni, the rod comprising a plurality of electrode bodies at regular intervals and a body which, since the specific resistance between electrodes provided body to the main body so as to measure the state of formation of an improved body formed ground, dedicated It is not necessary to prepare another long rod, it can be finished device at low cost. Moreover, since it is only necessary to store a portion that replaces the screw point, storage and transportation are facilitated. Furthermore, it is no longer necessary to remove heavy objects such as excavation shafts and stirring blades as in the past, and without using heavy machinery or the like, it can be matched to the 25 cm pitch mark formed on the outer peripheral surface of the rod. It becomes possible to penetrate and measure. In addition, since the electrode wire can be derived obliquely from the axial direction, it is possible to reduce the resistance applied to the electrode wire when penetrating the measuring device. Even if resistance is applied, the weight used in the Swedish sounding tester can be used, so that the penetration work can be facilitated.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a measuring device 2 using a Swedish sounding tester 1 in the present embodiment, and FIG. 2 shows an enlarged view of the measuring device 2. As shown in FIG. FIG. 3 shows how to use the measuring device 2.

  The measuring device 2 in this embodiment is configured so that the screw point 12 attached to the tip of the rod 11 of the Swedish sounding tester 1 can be removed and used, and is a connecting part attached to the lower end side of the rod 11. The device includes a certain male screw portion 21 and a main body 20 having a ring-shaped electrode body 22 provided on the outer peripheral portion.

  As shown in FIG. 4, the Swedish sounding tester 1 used in the measuring device 2 includes a plurality of rods 11 connected in the vertical axis direction and a screw point connected to the lower end portion of the rod 11. 12, a mounting clamp 13 for mounting the weight body 14 on the upper end side of the rod 11 and a handle 15 for rotating the rod 11.

  The rod 11 is composed of a metal rod whose upper end is set to a male screw and whose lower end is set to a female screw. The normal length is set to 100 cm, and only the lowermost one rod 11 is set to 80 cm. is doing. And the length from the lowest point to the connection part of the next rod 11 can be set to 100 cm by setting the length of the screw point 12 connected to the lowermost rod 11 and the measuring device 2 to 20 cm. I am doing so. In addition, the outer periphery of the rod 11 is provided with a mark 110 having a ring-like cut at a pitch of 25 cm from the lowest point, and the penetration depth can be specified along the mark 110 at a pitch of 25 cm. ing.

  On the other hand, the screw point 12 connected to the lowermost rod 11 has an arrowhead shape with a sharpened tip, and is screwed into the ground by rotating a handle 15 attached to the upper end of the rod 11. It is configured in such a shape. Further, on the upper end side of the screw point 12, a male screw portion 21 to be screwed onto the female screw of the rod 11 is provided, and the male screw portion 21 is connected to the lower end of the rod 11 by screwing.

  On the other hand, the mounting clamp 13 attached to the rod 11 can be fixed at a predetermined position by being fitted from the upper end of the rod 11, and the lever 11 is lowered to a predetermined position. It can be fixed to. Then, by fixing the mounting clamp 13 in this manner, the weight body 14 can be mounted on the upper surface thereof. The weight body 14 is provided with a notch extending from the outer peripheral surface to the center portion, and can be inserted from the side of the rod 11, and has a predetermined weight of 5 kg, 15 kg, 25 kg, 50 kg, 75 kg or the like. Has weight. In the ground survey, if the rod 11 no longer sinks even when a 100 kg weight 14 is placed, the number of rotations of the handle 15 required to rotate the handle 15 and advance 25 cm is recorded.

  In the Swedish sounding tester 1 configured as described above, the measuring device 2 is configured to be replaceable with the screw point 12.

  This measuring device 2 has a cylindrical main body 20 configured to have substantially the same external dimensions as the rod 11, and the length dimension along the axial direction is set to 20 cm, which is the same as that of the screw point 12. . The upper part of the main body 20 of the measuring device 2 is provided with the same male threaded portion 21 as the screw point 12, and the male threaded portion 21 is screwed onto the female thread of the rod 11 so that it can be connected to the rod 11. ing. In addition, the main body 20 of the measuring device 2 has strength, rigidity, and durability that do not break when penetrating or pulling out, and the bottom point portion is configured in a point shape so that the main body 20 can be broken. The resistance from the slurry is reduced.

  Four ring-shaped electrode bodies 22 are provided on the outer peripheral surface of the main body 20 with an interval of 1 to 2 cm. The electrode body 22 applies a current to the uppermost electrode body 22 and the lowermost electrode body 22, and measures the specific resistance in the soil by measuring the potential with the two inner electrode bodies 22. The electrode wire 24 of the electrode body 22 is provided with an oblique cut on the contact surface with the rod 11 and is led out from the recess 23 formed by this cut. That is, if the electrode wire 24 is led out from the side of the main body 20 vertically, resistance may be applied when penetrating or withdrawing, and bubbles may be generated in the slurry. Therefore, in order to prevent generation of bubbles without penetrating at the time of penetration or withdrawal, an oblique cut is provided, and the electrode wire 24 is led obliquely upward therefrom. The remaining portion of the electrode wire 24 thus derived is fixed to the outer peripheral portion of the rod 11 using a vinyl tape 3 or the like.

  Next, an operation method in the case of measuring the formation state of the columnar column 5 using the measuring apparatus 2 configured as described above will be described.

  First, when inspecting the formation state of the columnar column 5 formed on the ground, the screw point 12 attached to the tip of the rod 11 of the Swedish sounding tester 1 is removed, and the measuring device 2 is connected to the female screw at the lower end portion thereof. The male screw portion 21 is screwed. Then, the electrode wire 24 is led out obliquely upward from the recess 23 formed between the lowermost rod 11 by this screwing, and the remaining electrode wire 24 is attached to the outer peripheral surface of the rod 11 using a vinyl tape 3 or the like. Secure with.

  And after attaching the measuring apparatus 2 to the rod 11 in this way, this time, the guide member 4 which has the hole 41 matched with the external dimension of the rod 11 is installed in the ground surface side of the columnar column 5, and this hole The rod 11 is penetrated from 41 in the vertical direction. Here, as the guide member 4, a member having a hole 41 matched to the diameter of the rod 11 in a square member can be used. Then, the rod 11 is inserted into the hole 41 of the guide member 4 and penetrated by 25 cm while looking at the mark 110 of 25 cm pitch provided on the outer peripheral surface of the rod 11. And it stops at the time of making it penetrate 25 cm, and the specific resistance in the position is measured. Thereafter, similarly, the measuring device 2 is penetrated by 25 cm, and measurement is performed up to a predetermined depth position where the columnar column 5 is formed.

  At this time, the measuring apparatus 2 may not be able to penetrate into the soil due to the viscosity of the columnar column 5 or the kneaded soil quality. In such a case, a predetermined weight body 14 is placed on the placement clamp 13, and the measuring device 2 is inserted into the columnar column 5 by the load of the weight body 14 and the rotation operation by the handle 15.

  As described above, according to the above embodiment, the measuring device 2 is configured to be replaceable with the screw point 12 of the Swedish sounding tester 1, so that it is not necessary to purchase a new dedicated rod 11, and Since only the part that replaces the screw point 12 needs to be stored, storage and transportation are also prepared. Further, as shown in FIG. 7, it is not necessary to remove heavy objects such as the excavating shaft 61 and the stirring blade, and it is possible to perform measurement at a predetermined pitch manually without using a heavy machine or the like. become.

  Further, when the electrode wire 24 is led out from such a measuring apparatus 2, a concave portion 23 having an oblique notch is formed in a boundary portion with the rod 11 in the main body, and the electrode wire 24 is led obliquely upward from the concave portion 23. Thus, the electrode line 24 can be led out obliquely along the axial direction, and the resistance applied to the electrode line 24 at the time of penetration can be reduced. Further, when the measuring device 2 is pulled out, the lower end surface of the rod 11 is horizontal, so that the slurry does not enter the concave portion 23, thereby preventing water from entering from the drawn portion of the electrode wire 24. Can do.

  In addition, this invention is not limited to the said embodiment, It can implement in a various aspect.

  For example, in the above embodiment, the main body 20 is used with the lower end portion being pointed, but the lower end portion may be formed in a spiral shape as in the conventional screw point 12.

  Moreover, in the said embodiment, although the electrode wire 24 is derived | led-out from the recessed part 23 notched diagonally, the electrode wire 24 is derived | led-out so that it may face diagonally upward from the outer peripheral surface of the main body 20 of the measuring apparatus 2. FIG. You may do it.

  Furthermore, in the above-described embodiment, the upper end portion of the measuring device 2 is set to be a male screw corresponding to the male screw / female screw of the rod 11, but these may be appropriately changed.

Measuring device using Swedish sounding tester showing one embodiment of the present invention Enlarged view of the measuring device in the same form The figure which shows the measuring method in the form Diagram showing a traditional Swedish sounding tester Figure showing a conventional agitation excavator Diagram showing a conventional measuring device Diagram showing a conventional measuring device

DESCRIPTION OF SYMBOLS 1 ... Swedish sounding tester 2 ... Measuring apparatus 3 ... Vinyl tape 4 ... Guide member 5 ... Columnar column 11 ... Rod 110 ... Mark 12 ... Screw point 13 ... Mounting clamp 14 ... Weight 15 ... Handle 20 ... Main body 21 ... Male screw 22 ... Electrode body 23 ... Recess 24 ... Electrode wire 41 ...・ Hole

Claims (1)

A Swedish sounding tester comprising a plurality of rods connected in the axial direction, a screw point that is detachably attached to the front end side of the rod, and a weight that is attached in the vicinity of the rear end side of the rod. A measuring device for the ground improvement body used,
A connecting portion attached to the tip end side of the rod in an exchangeable manner with the screw point ;
It has the same length as the screw points have the same external dimensions as the rod, Rutotomoni includes a plurality of electrode bodies at regular intervals, to form a recess having a cut oblique to the boundary portion between the rod And a main body for deriving the electrode wire of the electrode body obliquely upward, and a ground improvement body for measuring the formation state of the improvement body formed on the ground by the specific resistance between the electrode bodies provided on the main body. measuring device.

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