JP2008197070A - Covering depth measuring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To measure a covering depth easily, before placing a concrete, for a deep depth and a narrow section to which operator's hand does not reach and further for the section which a visual measurement can not perform. <P>SOLUTION: The covering depth measuring device comprises a measuring part 20 which can measure whether the covering depth is not less than a prescribed value by inserting the measuring part 20 into a clearance between inside of a mold 50 and a reinforced bar 40 and moving the measuring part 20, and a strut 30 which is connected with the measuring part 20. The maximum width part of the measuring part 20 is setting with the prescribed covering depth. The strut 30 is operated and the maximum width part is moved within the clearance between inside of the mold 50 and the reinforced bar 40, if this maximum width part of the measuring part 20 can be passed, it is judged that the covering depth is not less than a prescribed value. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a measuring apparatus for measuring a covering thickness before placing concrete.

  In order to ensure the durability of the concrete structure, it is important to properly manage the covering thickness. Conventionally, in a general construction site, the covering thickness is measured using a ruler such as a metal tape measure after the formwork is built. In the method of measuring the covering thickness using such a ruler, it is apt to be inaccurate even if it is possible to measure a part that cannot be reached or a part that cannot be visually recognized. Furthermore, since the measurement takes time, the measurement is often performed only on the minimum necessary part.

Therefore, various techniques for measuring the covering thickness of concrete structures have been developed.
For example, an apparatus for measuring the covering thickness of a concrete structure after placing concrete is disclosed (see Patent Document 1). The apparatus described in Patent Document 1 places concrete on the surface of a reinforcing bar after attaching an RFID tag capable of reading and writing electronic information in a non-contact manner. A radio wave is transmitted to the RFID tag, and a radio wave transmitted from the RFID tag is received to detect the intensity of the radio wave transmitted through the concrete and measure the covering thickness.

  In addition, as a technique for measuring the covering thickness before placing concrete, an apparatus for measuring the covering thickness of the top surface of the concrete and the outermost end of the reinforcing bar is disclosed (see Patent Document 2). . The technique described in Patent Document 2 includes a measurement box that stores a tape measure displayed on a scale, and a measuring instrument attached to the tip of the tape measure. In addition, a formwork measuring instrument is attached.

  In order to measure the cover thickness using this apparatus, the formwork is marked in advance so that the minimum cover thickness defined by each member is obtained. Then, the scale displayed on the measurement box is aligned with the inked point, and the measuring instrument attached to the tip of the measuring tape is moved to the opposite formwork while extending the measuring tape. Furthermore, as with the measurement box, it is said that the covering thickness can be measured by matching the scale displayed on the measuring instrument with the points marked with black ink.

JP 2004-294288 A JP 2002-228401 A

  By the way, if it is found that the covering thickness is insufficient after the concrete structure is completed, it must be repaired or remade, which is not only expensive, but also when the concrete structure is in service. It will have a big impact.

Since the technique described in Patent Document 1 measures the covering thickness of a concrete structure after placing concrete, it cannot be checked in advance and cannot solve the above-described problems.
In this regard, the technique described in Patent Document 2 measures the covering thickness before placing concrete, but not only the apparatus configuration is complicated, but also the measuring method is complicated, and covering in a concrete structure is performed. It was difficult to say that the thickness could be measured easily and accurately.

  The present invention has been proposed in view of the above-mentioned circumstances, and even though the structure is simple, even if it is a deep part or narrow part that cannot be reached by an operator before placing concrete, or even a place where visual measurement is not possible. An object of the present invention is to provide a measuring apparatus capable of easily measuring the covering thickness.

The covering thickness measuring apparatus of the present invention has the following features in order to achieve the above-described object.
The covering thickness measuring device of the present invention measures whether or not the covering thickness is equal to or greater than a predetermined value by being inserted into the gap between the inner surface of the mold and the reinforcing bar and moving between the inner surface of the mold and the reinforcing bar. And a strut connected to the measurement member.

  The measuring member has a maximum width portion set to a predetermined covering thickness, and the maximum width portion can be moved within the interval between the formwork inner surface and the reinforcing bar by operating the support column, and the maximum width portion can pass therethrough. The covering thickness is determined to be greater than or equal to a predetermined value.

  Further, the measuring member is formed to have a maximum width portion set to a predetermined covering thickness and a portion set to be smaller than the predetermined covering thickness. It is possible to make it change so that the width | variety at the time of passing between between a formwork inner surface and a reinforcing bar may be changed.

  The covering thickness measuring device having such a configuration is preferably used particularly when measuring the covering thickness in the horizontal direction. In order to use this covering thickness measuring apparatus, a measuring member is inserted into the space between the inner surface of the mold and the reinforcing bar from above the mold with a support. And by pushing down a support | pillar, the maximum width part of a measurement member is moved within the space | interval of a formwork inner surface and a reinforcing bar. At this time, if the maximum width portion can pass through the space between the inner surface of the formwork and the reinforcing bar, it is determined that the covering thickness is appropriate. On the other hand, if the maximum width portion cannot pass through the space between the inner surface of the mold and the reinforcing bar, it is determined that the covering thickness is inappropriate.

  When the maximum width portion cannot pass through the space between the inner surface of the mold and the reinforcing bar, the measuring member is rotated by rotating the support column around the axis, and the portion set smaller than the cover thickness is Push the column further down so that it is positioned within the distance from the reinforcing bar. Thereby, the further lower covering thickness can be measured. When pulling out the measuring member from the space between the inner surface of the formwork and the reinforcing bar, the space between the inner surface of the formwork and the reinforcing bar is made to face the inner surface of the formwork and the reinforcing bar with a portion set smaller than the covering thickness. The measuring member can be pulled out from the inside at once.

  Further, it is possible to adopt a configuration in which the measurement member is offset and attached to the support column by bending the support column in the middle of the length direction.

  The covering thickness measuring device having such a configuration is preferably used particularly when measuring the covering thickness in the vertical direction. In order to use this covering thickness measuring device, the measuring member is inserted into the space between the inner surface of the mold and the reinforcing bar by holding the support. And by moving a support | pillar to a horizontal direction, the maximum width part of a measurement member is moved within the space | interval of a formwork inner surface and a reinforcing bar. At this time, if the maximum width portion can pass through the space between the inner surface of the formwork and the reinforcing bar, it is determined that the covering thickness is appropriate. On the other hand, if the maximum width portion cannot pass through the space between the inner surface of the mold and the reinforcing bar, it is determined that the covering thickness is inappropriate.

The measurement member preferably has an adjustment mechanism for adjusting the maximum width.
The covering thickness measuring apparatus having such a configuration can measure the covering thickness that matches the situation at the construction site by adjusting the maximum width using the adjusting mechanism.

Further, the measurement member includes an urging unit that applies an urging force in a direction in which the maximum width increases, and a maximum width detector that measures the maximum width data and converts the measurement value into an electric signal and outputs the electric signal. It is possible to configure.
In the covering thickness measuring apparatus having such a configuration, the maximum width portion follows the inner surface of the mold and the reinforcing bar by the biasing force of the biasing means. Since the maximum width data is measured by the maximum width detector, converted into an electric signal and output, the maximum width data can be sequentially acquired by taking in the electric signal.

Further, the measuring member is composed of a disk-shaped member that is rotatable with respect to the support column and is detachable. A plurality of disk-shaped members having different diameters are prepared, and are exchanged according to a predetermined covering thickness. It is possible.
The covering thickness measuring apparatus having such a configuration can measure the covering thickness that matches the situation at the construction site by exchanging the disk-shaped member.

  In describing the covering thickness measuring apparatus of the present invention, the terms horizontal direction and vertical direction are used, but the horizontal direction includes not only a complete horizontal direction but also a direction having a slight inclination. The vertical direction includes not only a complete vertical direction but also a direction having a slight inclination.

  The covering thickness measuring apparatus of the present invention inserts a measuring member whose maximum width is set to a predetermined covering thickness into a gap between the formwork inner surface and the reinforcing bar to move between the formwork inner surface and the reinforcing bar. Thus, it is possible to measure whether or not the covering thickness is a predetermined value or more.

  This covering thickness measuring apparatus has a simple structure and is easy to operate. Further, the covering thickness can be easily measured even in a deep part or a narrow part that cannot be reached by an operator before the concrete is placed, or even in a place where visual measurement is not possible.

  Therefore, the management of the covering thickness before the concrete placement becomes appropriate, and the durability of the concrete structure can be ensured. In addition, as a secondary effect, work such as repair and remodeling is not required, construction costs can be reduced, work delays can be eliminated, and concrete structures can be built and put into service on schedule. Can start.

Embodiments of a covering thickness measuring apparatus according to the present invention will be described below with reference to the drawings.
<First Embodiment>
With reference to FIGS. 1-5, the covering thickness measuring apparatus which concerns on the 1st Embodiment of this invention is demonstrated.
1 to 3 show a covering thickness measuring apparatus according to a first embodiment of the present invention. FIG. 1 is a perspective view, FIG. 2 is a cross-sectional view of a measuring member, and FIG. FIG. 4 and 5 show the configuration of a reinforcing bar to which the covering thickness measuring apparatus according to the first embodiment of the present invention is preferably applied. FIG. 4 is an explanatory diagram of the reinforcing bar, and FIG. FIG.

  The covering thickness measuring apparatus 10 according to the first embodiment of the present invention measures the covering thickness in the horizontal direction at a location where the reinforcing bar facing the inner surface of the mold has a shape as shown in FIGS. 4 and 5. In this case, it is preferably used.

  As shown in FIG. 1, the covering thickness measuring apparatus 10 according to the first embodiment includes a measuring member 20 and a support column 30 connected to the measuring member 20. Hereinafter, the axial direction of the support column 30 is referred to as the moving direction of the measurement member 20, the surface on which the support column 30 is attached in the measurement member 20 is referred to as the upper surface, and the surface opposite thereto is referred to as the lower surface. The surface in contact with the left and right side surfaces is referred to as the left and right side surfaces, and the surfaces adjacent to the left and right side surfaces along the axial direction of the support column 30 are referred to as the front and rear side surfaces.

  The support column 30 is a member for supporting the measurement member 20. The length of the support | pillar 30 can be suitably changed according to a measurement site | part. Here, the measuring apparatus 10 can be made compact by dividing the support column 30 into a plurality of parts or by using a telescopic type. As described above, when the support column 30 is divided, when the measuring apparatus 10 is used, the support column 30 having a desired length can be obtained by appropriately connecting a number of parts. Moreover, when the support | pillar 30 is made into a telescopic type, when using the measuring apparatus 10, it can be set as the support | pillar 30 of desired length by pulling out the number of support | pillars 30 suitably. Further, the support column 30 may be detachable from the measurement member 20.

  The measuring member 20 is inserted into the gap between the inner surface of the mold 50 and the reinforcing bar 40 and is moved between the inner surface of the mold 50 and the reinforcing bar 40 to determine whether the covering thickness is a predetermined value or more. It is a member for measuring. The measuring member 20 includes a box-shaped outer portion 21 whose one side is an open surface, and a box-shaped inner portion 22 that is inserted into the outer portion 21.

The outer portion 21 has a curved surface 21 a whose surface facing the open surface is curved in a convex shape toward the outside along the moving direction of the measuring member 20. In addition, long holes 21b extending in a direction orthogonal to the moving direction of the measuring member 20 are provided on both front and rear side surfaces.
The inner portion 22 has a curved surface 22a whose surface facing the side to be inserted into the outer portion 21 is curved outwardly along the moving direction of the measuring member 20.

Further, as shown in FIG. 2, the bolts 23 are continuously inserted into the long holes 21 b and the inner portion 22 of the outer portion 21 so that the outer portion 21 and the inner portion 22 are integrated, and the inner portion 22 is outside. It can move with respect to the portion 21 within the range of the long hole 21b. Then, after setting the maximum width W in the direction orthogonal to the moving direction of the measuring member 20 to be a predetermined covering thickness, the maximum width W is adjusted by tightening the nuts 24 attached to both ends of the bolt 23. Can do.
The measuring member 20 is set such that the distance D between the front and rear side surfaces is smaller than a predetermined covering thickness.

Next, with reference to FIG. 3, a method of measuring the covering thickness using the covering thickness measuring apparatus 10 according to the first embodiment will be described.
In order to measure the covering thickness using the covering thickness measuring apparatus 10 according to the first embodiment, the measuring member 20 is inserted into the interval between the mold 50 and the reinforcing bar 40 with the support 30. Then, by pushing down the support column 30, the portion of the measuring member 20 having the maximum width W is moved within the interval between the inner surface of the mold 50 and the reinforcing bar 40. At this time, if the portion having the maximum width W can pass through the space between the inner surface of the mold 50 and the reinforcing bar 40, it is determined that the covering thickness is appropriate. On the other hand, if the portion with the maximum width W cannot pass through the space between the inner surface of the mold 50 and the reinforcing bar 40, it is determined that the covering thickness is smaller than the specified value.

  If the portion with the maximum width W cannot pass through the space between the inner surface of the mold 50 and the reinforcing bar 40, the support 30 is rotated about 90 degrees around the axis, and the front and rear side surfaces of the measuring member 20 are placed on the mold 50. By facing the inner surface of the steel and the reinforcing bar 40, the measuring member 20 can be pushed down. Then, the strut 30 is rotated about 90 degrees around the axis again, and the covering thickness is measured so that the maximum width W portion of the measuring member 20 faces the inner surface of the mold 50 and the reinforcing bar 40.

  Further, when the measuring member 20 is pulled out from the space between the inner surface of the mold 50 and the reinforcing bar 40, the support column 30 is rotated about 90 degrees around the axis so that the front and rear side surfaces of the measuring member 20 are the inner surface of the mold 50 and By facing the reinforcing bar 40, the measuring member 20 can be pulled out at a stroke from the distance between the inner surface of the mold 50 and the reinforcing bar 40.

  Further, since the left and right side surfaces of the measurement member 20 are curved surfaces 21a and 22a that are curved outwardly along the moving direction of the measurement member 20, the measurement member 20 is used when performing measurement work. Is not caught by the inner surface of the mold 50 or the reinforcing bar 40.

  Note that the maximum width W between the left and right side surfaces, the width D between the front and rear side surfaces, the length of the long hole 21b, the length of the column 30 and the like of the measurement member 20 are appropriately changed according to the situation of the location where the covering thickness is measured. Can be set.

<Second Embodiment>
With reference to FIGS. 6-10, the covering thickness measuring apparatus which concerns on the 2nd Embodiment of this invention is demonstrated. FIGS. 6 to 8 show a covering thickness measuring apparatus according to a second embodiment of the present invention. FIG. 6 is a perspective view, FIG. 7 is a longitudinal sectional view of a measuring member, and FIG. FIG. 9 and 10 show the configuration of a reinforcing bar to which the covering thickness measuring apparatus according to the second embodiment of the present invention is preferably applied. FIG. 9 is an explanatory diagram of the reinforcing bar, and FIG. FIG.

  The covering thickness measuring apparatus 210 according to the second embodiment of the present invention measures the covering thickness in the vertical direction at a location where the reinforcing bar facing the inner surface of the mold is shaped as shown in FIGS. 9 and 10. In this case, it is preferably used.

  As shown in FIG. 6, the covering thickness measuring apparatus 210 according to the second embodiment includes a measuring member 220 and a support column 230 connected to the measuring member 220. Hereinafter, the surface to which the column 230 is attached and the surface opposite thereto are referred to as the left and right side surfaces, the inner surface of the mold 50 or the surface in contact with the reinforcing bar 40 is referred to as the upper and lower side surfaces, and the surface adjacent to the left and right side surfaces along the axial direction of the column 230 Will be referred to as the front and back sides.

  The support column 230 is bent in the vicinity of the attachment portion to the measurement member 220, and the measurement member 220 is attached to the support column 230 while being offset. Note that the support column 230 may be of a split type or a telescopic type, and the support column 230 may be detachable from the measurement member 220, as in the first embodiment described above.

As shown in FIGS. 6 to 8, the measurement member 220 rotates the measurement member 20 of the first embodiment described above 90 degrees in the vertical direction, and has wheels 25 attached to the lower sides of the front and rear side surfaces, respectively. The auxiliary wheel 26 is attached to the support 230. The measurement member 220 of the second embodiment has substantially the same configuration as the measurement member 20 of the first embodiment described above except for the presence or absence of the wheel 25 and the auxiliary wheel 26, and therefore is the same as a part having the same function. Detailed description will be omitted.
As shown in FIGS. 6 and 8, the auxiliary wheel 26 is a member for preventing the measuring member 220 from being tilted during measurement, and the wheel 25 and the auxiliary wheel 26 are in contact with the inner surface of the mold 50. Thus, the diameter and the like are set so that the measurement member 220 is substantially perpendicular to the inner surface of the mold 50.

Next, with reference to FIG. 8, a method of measuring the covering thickness using the covering thickness measuring apparatus 210 according to the second embodiment will be described.
In order to measure the covering thickness using the covering thickness measuring apparatus 210 according to the second embodiment, the support member 230 is held and the measuring member 220 is inserted into the space between the mold 50 and the reinforcing bar 40. And the support | pillar 230 is operated and the part of the maximum width W of the measurement member 220 is moved within the space | interval of the inner surface of the formwork 50, and the reinforcing bar 40. FIG. At this time, if the portion having the maximum width W can pass through the space between the inner surface of the mold 50 and the reinforcing bar 40, it is determined that the covering thickness is appropriate. On the other hand, if the portion with the maximum width W cannot pass through the space between the inner surface of the mold 50 and the reinforcing bar 40, it is determined that the covering thickness is smaller than the specified value.

  And when the measurement of the said location is complete | finished, with the support | pillar 230, by pulling out the measurement member 220 from within the space | interval of the formwork 50 and the reinforcing bar 40, by performing the operation | movement similar to having mentioned above in the next measurement location, The covering thickness is measured sequentially.

  The maximum width W between the upper and lower side surfaces, the width D between the front and rear side surfaces, the length of the long hole 21b, the length of the column 230, the offset position, the sizes of the wheels 25 and the auxiliary wheels 26, etc. The thickness can be appropriately changed and set according to the situation of the location where the thickness is measured.

<Third Embodiment>
With reference to FIG. 11, a covering thickness measuring apparatus according to a third embodiment of the present invention will be described. FIG. 11 is a cross-sectional view of a measuring member used in the covering thickness measuring apparatus according to the third embodiment of the present invention.

  The covering thickness measuring device according to the third embodiment of the present invention is compared with the measuring members 20 and 220 used in the covering thickness measuring devices 10 and 210 according to the first embodiment or the second embodiment described above. Further, an urging means 60 for applying an urging force in a direction in which the maximum width W increases, and a maximum width detector 70 for measuring the maximum width data and converting the measured value into an electric signal and outputting the same are added.

  The external structure of the column and the measurement member is the same as that of the covering thickness measurement devices 10 and 210 according to the first embodiment and the second embodiment described above. Only the maximum width detector 70 will be described.

  As shown in FIG. 11, the measuring member 320 used in the covering thickness measuring apparatus according to the third embodiment has a configuration in which an urging means 60 is provided between the outer portion 21 and the inner portion 22. That is, the measurement member 320 of the third embodiment includes an urging unit 60 that applies an urging force in a direction in which the maximum width W increases. The urging means 60 includes an insertion portion 61 provided so as to protrude from the inner surface of the outer portion 21 toward the inner portion 22, and a receiving portion provided on the inner portion 22 so as to face the insertion portion 61. 62.

  The insertion portion 61 is formed with an inclined surface 61a so that the width decreases toward the tip. The receiving part 62 consists of a pair of movable piece 62a which protruded toward the insertion part 61, and each movable piece 62a has elasticity and flexibility. And if the insertion part 61 is inserted from the front-end | tip in the space | interval of a pair of movable piece 62a, the inclined surface 61a of the insertion part 61 will contact | abut to the inner surface of a pair of movable piece 62a. In this state, when a force is applied in a direction in which the maximum width W of the measurement member 320 is reduced, the inclined surface 61a of the insertion portion 61 acts to push the pair of movable pieces 62a. On the other hand, when the force applied to the measurement member 320 is released, the pair of movable pieces 62a pushes back the insertion portion 61 in an attempt to return to the original due to elasticity, and an urging force acts in a direction in which the maximum width W of the measurement member 320 increases.

  A strain gauge for measuring the deflection of the movable piece 62 a is attached to the movable piece 62 a constituting the receiving portion 62, and this strain gauge functions as the maximum width detector 70. Although not shown, one end of an electric wire is connected to the strain gauge, and a measuring instrument is attached to the other end of the electric wire.

  As described above, since the amount of deflection of the movable piece 62a changes with the change in the maximum width W of the measuring member 320, the change in the amount of deflection is extracted as an electrical signal by the strain gauge and read by the measuring instrument. Data can be measured.

  Note that the attachment position of the urging means 60 is not limited to the mode shown in FIG. 11 and can be changed as appropriate, such as attaching the insertion portion 61 to the inner portion 22 and attaching the receiving portion 62 to the outer portion 21. Can be implemented. Further, a spring or the like may be used as the biasing means 60.

  The maximum width detector 70 is not limited to a strain gauge, and can be a cantilever type, a sliding resistance type, or any other device that can measure displacement by converting the amount of displacement of an object into an electrical signal. A known displacement transducer such as a ribbon type or an inductance type can be used.

<Fourth Embodiment>
With reference to FIG.12 and FIG.13, the covering thickness measuring apparatus which concerns on the 4th Embodiment of this invention is demonstrated. FIGS. 12 and 13 show a covering thickness measuring apparatus according to a fourth embodiment of the present invention. FIG. 12 is a perspective view, and FIG. 13 is a side view of a tip portion of a column and a measuring member.

  As shown in FIG. 12, the covering thickness measuring apparatus 410 according to the fourth embodiment of the present invention includes a disk-shaped measuring member 420 and a support column 430 connected to the measuring member 420. The covering thickness measuring apparatus 410 according to the fourth embodiment is suitably used when measuring the covering thickness in the horizontal direction, similarly to the covering thickness measuring apparatus 10 according to the first embodiment.

  As shown in FIGS. 12 and 13, the support shaft 430 is provided with a rotating shaft 80 projecting from the vicinity of the tip portion thereof to the side, and the tip portion of the rotating shaft 80 is connected to the rotating shaft 80. On the other hand, the mounting portion 90 can be bent substantially at a right angle. Further, the attachment portion 90 can be fixed in a state of being bent at a substantially right angle with respect to the rotation shaft 80. Specifically, for example, by providing an urging member such as a spring that urges the attachment portion 90 in a direction to bend at a substantially right angle with respect to the rotation shaft 80, the attachment portion 90 is moved with respect to the rotation shaft 80. It can be fixed in a bent state at a substantially right angle.

  The length of the column 430 can be appropriately changed according to the measurement site. Note that the support column 430 may be a split type or a telescopic type, and the support column 430 may be detachable from the measurement member 420, as in the first embodiment described above.

  As shown in FIGS. 12 and 13, the measurement member 420 is formed of a disk-shaped roller, and a rotation shaft insertion hole 81 is provided at the center. The diameter of the measuring member 420 is set according to a predetermined covering thickness, and the thickness is set to be sufficiently smaller than the diameter. As shown in FIG. 13, a plurality of types of measuring members 420 are prepared so that the diameter corresponds to a predetermined covering thickness.

  In order to attach the measuring member 420 to the support column 430, the mounting portion 90 and the rotation of the mounting shaft 90 in the rotation shaft insertion hole 81 of the measurement member 420 are arranged so that the rotation shaft 80 and the mounting portion 90 of the support column 430 are aligned. The shaft 80 is inserted. Then, the measuring member 420 is pivotably fixed to the distal end portion of the support column 430 by bending the attachment portion 90 at a substantially right angle with respect to the rotation shaft 80. On the other hand, in order to remove the measuring member 420 from the support column 430, the mounting shaft 90 and the rotating shaft are inserted from the rotating shaft insertion hole 81 of the measuring member 420 so that the rotating shaft 80 and the mounting portion 90 of the supporting column 430 are aligned. Just pull through 80.

  The mechanism for attaching the measuring member 420 to the rotating shaft 80 is not limited to the above-described one. For example, a through-hole perpendicular to the axial direction is provided at the tip of the rotating shaft 80 so that the measuring member 420 is inserted into the rotating shaft. After the rotation shaft 80 is inserted into the hole 81, a retaining pin may be inserted into the through hole, and the measurement member 420 may be rotatably fixed to the rotation shaft 80. In such a configuration, the retaining member inserted through the through hole is pulled out, and the rotating shaft 80 is pulled out from the rotating shaft insertion hole 81 of the measuring member 420 to remove the measuring member 420 from the support column 430. be able to.

  In order to measure the covering thickness using the covering thickness measuring apparatus 410 according to the fourth embodiment, the support member 430 is held and the measuring member 420 is inserted into the space between the formwork and the reinforcing bar. And the diameter part (maximum width part) of the measurement member 420 is moved within the space | interval of the inner surface of a formwork, and a reinforcing bar by pushing down the support | pillar 430. FIG. At this time, if the diameter portion (maximum width portion) can pass through the space between the inner surface of the mold and the reinforcing bar, it is determined that the covering thickness is appropriate. On the other hand, if the diameter portion (maximum width portion) cannot pass through the space between the inner surface of the mold and the reinforcing bar, it is determined that the covering thickness is smaller than the specified value.

  Further, when the diameter portion (maximum width portion) cannot pass through the space between the inner surface of the mold and the reinforcing bar, the support column 430 is rotated about 90 degrees around the axis, and the thickness direction of the measuring member 420 is set to the shape of the mold. By facing the inner surface and the reinforcing bar, the measuring member 420 can be pushed down. Then, the strut 430 is rotated about 90 degrees around the axis again, and the covering thickness is measured so that the diameter direction (maximum width portion) of the measuring member 420 faces the inner surface of the mold and the reinforcing bar.

Further, when the measuring member 420 is pulled out from the space between the inner surface of the mold and the reinforcing bar, the support column 430 is rotated about 90 degrees around the axis, and the thickness direction of the measuring member 420 is opposed to the inner surface of the mold and the reinforcing bar. By doing so, the measuring member 420 can be pulled out at once from within the space between the inner surface of the mold and the reinforcing bar.
Further, since the measuring member 420 has a disk shape, the measuring member 420 is not caught by the inner surface of the mold or the reinforcing bar when performing the measurement work.

  In addition, the diameter and thickness of the measurement member 420, the length of the support | pillar 430, etc. can be suitably changed and set according to the condition of the location which measures covering thickness.

<Fifth Embodiment>
With reference to FIG. 14, a covering thickness measuring apparatus according to a fifth embodiment of the present invention will be described. FIG. 14 is a perspective view of a covering thickness measuring apparatus according to the fifth embodiment of the present invention.

  As shown in FIG. 14, the covering thickness measuring apparatus 510 according to the fifth embodiment of the present invention includes a disk-shaped measuring member 520 and a column 530 connected to the measuring member 520. The covering thickness measuring apparatus 510 according to the fifth embodiment is preferably used when measuring the covering thickness in the vertical direction, similarly to the covering thickness measuring apparatus 210 according to the second embodiment.

  As shown in FIG. 14, the column 530 is bent in the middle of the length direction, and the measurement member 520 is attached to the column 530 while being offset. Although not shown in detail, as in the above-described fourth embodiment, a rotation shaft 80 is provided so as to protrude from the vicinity of the tip of the support column 530 toward the side. The distal end portion of the rotation shaft 80 is bent at a substantially right angle with respect to the rotation shaft 80 and serves as an attachment portion 90 for attaching the measurement member 520 to the rotation shaft 80 so as to be rotatable. The structures of the rotation shaft 80 and the attachment portion 90 are the same as those in the fourth embodiment described above.

  The length of the column 530 can be appropriately changed according to the measurement site. Note that the support column 530 may be a split type or a telescopic type, and the support column 530 may be detachable from the measurement member 520, as in the first embodiment described above.

Although not shown in detail, the measurement member 520 is formed of a disk-shaped roller as in the above-described fourth embodiment, and a rotation shaft insertion hole (not shown) is provided at the center. The diameter of the measuring member 520 is set according to a predetermined covering thickness, and the thickness is set to be sufficiently smaller than the diameter. A plurality of types of measurement members 520 are prepared so that the diameter corresponds to a predetermined covering thickness.
The procedure for attaching the measuring member 520 to the column 530 and the procedure for removing the measuring member 520 from the column 530 are the same as those in the fourth embodiment described above.

  In order to measure the covering thickness using the covering thickness measuring apparatus 510 according to the fifth embodiment, the measuring member 520 is inserted into the interval between the formwork and the reinforcing bar with the support column 530. Then, the support 530 is operated to move the diameter portion (maximum width portion) of the measuring member 520 within the gap between the inner surface of the mold and the reinforcing bar. At this time, if the diameter portion (maximum width portion) can pass through the space between the inner surface of the mold and the reinforcing bar, it is determined that the covering thickness is appropriate. On the other hand, if the diameter portion (maximum width portion) cannot pass through the space between the inner surface of the mold and the reinforcing bar, it is determined that the covering thickness is smaller than the specified value.

  And when the measurement of the said part is complete | finished, hold the support | pillar 530, pull out the measurement member 520 from the space | interval of a formwork and a reinforcing bar, and perform operation | movement similar to what was mentioned above in the next measurement part, one by one, Measure the cover thickness.

  Note that the diameter and thickness of the measurement member 520, the length and the bent shape of the support column 530, and the like can be appropriately changed and set according to the situation of the location where the covering thickness is measured.

The perspective view of the covering thickness measuring apparatus which concerns on the 1st Embodiment of this invention. The cross-sectional view of the measuring member which comprises the covering thickness measuring apparatus which concerns on the 1st Embodiment of this invention. Explanatory drawing of the use condition of the covering thickness measuring apparatus which concerns on the 1st Embodiment of this invention. Explanatory drawing which shows the structure of the reinforcing bar to which the covering thickness measuring apparatus which concerns on the 1st Embodiment of this invention is applied suitably. FIG. The perspective view of the covering thickness measuring apparatus which concerns on the 2nd Embodiment of this invention. The longitudinal cross-sectional view of the measuring member which comprises the covering thickness measuring apparatus which concerns on the 2nd Embodiment of this invention. Explanatory drawing of the use condition of the covering thickness measuring apparatus which concerns on the 2nd Embodiment of this invention. Explanatory drawing which shows the structure of the reinforcing bar which applies the covering thickness measuring apparatus which concerns on the 2nd Embodiment of this invention suitably. B arrow view in FIG. The cross-sectional view of the measurement member which comprises the covering thickness measuring apparatus which concerns on the 3rd Embodiment of this invention. The perspective view of the covering thickness measuring apparatus which concerns on the 4th Embodiment of this invention. The side view of the front-end | tip part and measuring member which comprise the covering thickness measuring apparatus which concerns on the 4th Embodiment of this invention. The perspective view of the covering thickness measuring apparatus which concerns on the 5th Embodiment of this invention.

Explanation of symbols

10, 210, 410, 510 Measuring device 20, 220, 320, 420, 520 Measuring member 21 Outer part 21a Curved surface 21b Long hole 22 Inner part 22a Curved surface 23 Bolt 24 Nut 25 Wheel 26 Auxiliary wheel 30, 230, 430, 530 Support 40 Reinforcing bar 50 Form 60 Biasing means 61 Insertion part 61a Inclined surface 62 Receiving part 62a Movable piece 70 Maximum width detector 80 Rotating shaft 81 Rotating shaft insertion hole 90 Mounting part W Maximum width D Set smaller than W Width of the marked part

Claims (6)

A device for measuring the covering thickness before placing concrete,
A measuring member for measuring whether the covering thickness is equal to or greater than a predetermined value by inserting the gap between the inner surface of the mold and the reinforcing bar and moving between the inner surface of the mold and the reinforcing bar;
A strut connected to the measurement member,
The measuring member has a maximum width portion set to a predetermined covering thickness, and the maximum width portion can be moved within the interval between the formwork inner surface and the reinforcing bar by operating the support column. If so, it is determined that the covering thickness is equal to or greater than a predetermined value.   The measuring member is formed to have a maximum width portion set to a predetermined covering thickness and a portion set to be smaller than the predetermined covering thickness, and the measuring member is pivoted by operating the support column. 2. The covering thickness measuring apparatus according to claim 1, wherein the width when passing between the inner surface of the formwork and the reinforcing bar is changed by rotating around.   2. The covering thickness measuring device according to claim 1, wherein the measuring member is attached with an offset to the support by bending the support in the middle of the length direction.   The covering thickness measuring apparatus according to claim 1, wherein the measuring member includes an adjusting mechanism that adjusts a maximum width.   The measurement member includes an urging unit that applies an urging force in a direction in which the maximum width increases, and a maximum width detector that measures the maximum width data and converts the measurement value into an electric signal and outputs the electric signal. The covering thickness measuring apparatus according to any one of claims 1 to 4, wherein the covering thickness measuring apparatus is provided.   The measuring member includes a disk-shaped member that is rotatable and detachable with respect to the support column, and a plurality of disk-shaped members having different diameters are prepared and replaced according to a predetermined covering thickness. The covering thickness measuring apparatus according to any one of claims 1 to 3.

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