Measurement device and measurement method

Abstract

To provide a measurement device and a measurement method that can efficiently measure the distance from a virtual surface of a concrete non-placement region to an object member in the non-placement region.SOLUTION: A measurement device 100 comprises: an aluminum square pipe 11 which is built in parallel with a virtual surface 10 of a concrete non-placement region s; and a gauge part 20 which is so provided on the aluminum square pipe 11 as to measure the distance from the virtual surface 10 to a stirrup reinforcement 5a in the non-placement region S along a normal direction of the virtual surface 10.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a measuring device and a measuring method for measuring the position of a target component within a concrete pouring area. [Background technology]

[0002] Patent Document 1 describes that in an erected precast concrete foundation, in order to measure the height of the precast concrete base plate, a ruler is used to measure the height from a level line stretched above the center as determined in advance to the top surface of the base plate. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 07-270162 Summary of the Invention [Problem to be solved by the invention]

[0004] The position of PC cables in prestressed concrete structures, such as bridges, is sometimes managed with an accuracy of a few millimeters. For example, the position of the reinforcing bars supporting the PC cable in uncast concrete areas is measured as the distance (height) from the virtual top of the concrete. However, when measuring this distance using a vertical line and a ruler, as in the conventional technology described above, the height of the vertical line is likely to change when the ruler comes into contact with the vertical line, resulting in inefficient re-measurements. Furthermore, when the PC cable is supported by multiple horizontal lines, the number of measurement points increases depending on the number and support positions of the horizontal lines. This requires the time and effort of carefully handling the vertical line and ruler each time a measurement is performed, placing a significant burden on the worker.

[0005] The present invention aims to provide a measuring device and a measuring method that can efficiently measure the distance from a virtual surface of an un-poured area of ​​concrete to a target component within the un-poured area. [Means for solving the problem]

[0006] A measuring device according to one aspect of the present invention comprises a reference rigid member that is placed so as to be parallel to a virtual surface of an unpoured area of ​​concrete, and a gauge unit that is provided on the reference rigid member so as to measure the distance along the normal direction of the virtual surface from the virtual surface to a target component in the unpoured area.

[0007] In a measurement device according to one aspect of the present invention, the distance from the virtual surface to a target component in an unpoured area along the normal direction of the virtual surface is measured by a gauge unit. The gauge unit is attached to a reference rigid member that is suspended so as to be parallel to the virtual surface of the unpoured area of ​​concrete. The reference rigid member is less likely to bend under its own weight or external forces than a level line, and is therefore more likely to maintain a parallel state to the virtual surface. This reduces the need for remeasurements due to misalignment of the reference compared to using a level line as a reference. Furthermore, because the reference rigid member is less likely to bend than a level line, it is easier to handle than a level line, and the burden on the worker can be reduced even when the number of measurement points is large. This makes it possible to efficiently measure the distance from the virtual surface of the unpoured area of ​​concrete to a target component in the unpoured area.

[0008] In one embodiment, the gauge unit may be slidably mounted along the reference rigid member. In this case, for example, for multiple measurement points aligned along the target member, the reference rigid member may be placed parallel to the target member and the gauge unit may be slid along the reference rigid member, allowing the gauge unit to be easily moved to positions corresponding to each measurement point. This allows for more efficient measurement of the distance from the virtual surface to the target member.

[0009] In one embodiment, the gauge section may be attached to the reference rigid member via a detachable member that is detachable from the reference rigid member. In this case, the gauge section is detachable from the reference rigid member together with the detachable member, so that the gauge section can be easily moved relative to the reference rigid member compared to, for example, a case where the gauge section is fixed to the reference rigid member.

[0010] In one embodiment, the gauge unit has an advancing / retracting member that extends along the normal direction of the imaginary surface, and the tip of the advancing / retracting member may have an abutment portion that extends parallel to the imaginary surface and abuts against the target component. In this case, even if the target component, i.e., a shelf reinforcement, is hidden behind another rebar, the abutment portion can be inserted behind the other rebar to bring the abutment portion into abutment against the shelf reinforcement, i.e., the target component, and distance can be measured.

[0011] In one embodiment, the target component is a reinforcing bar that supports a PC cable portion of a prestressed concrete structure, and the virtual surface may be a virtual top surface of the concrete that constitutes the prestressed concrete structure. In this case, the position of the PC cable portion can be adjusted depending on the position of the reinforcing bar.

[0012] A measurement method according to one aspect of the present invention comprises the steps of: placing a reference rigid member parallel to a virtual surface of an unpoured area of ​​concrete; providing a gauge section on the reference rigid member so as to measure distance along the normal direction of the virtual surface; and using the gauge section to measure the distance from the virtual surface to a target component in the unpoured area.

[0013] In a measurement method according to one aspect of the present invention, a gauge unit is provided on a reference rigid member that is suspended parallel to the imaginary surface of an uncast concrete area. This gauge unit is used to measure the distance from the imaginary surface to a target component within the uncast concrete area along the normal direction of the imaginary surface. Compared to a vertical line, the reference rigid member is less likely to bend under its own weight or external forces, making it easier to maintain a parallel state to the imaginary surface. This reduces the need for remeasurements due to misalignment of the reference compared to using a vertical line as a reference. Furthermore, because the reference rigid member is less likely to bend than a vertical line, it is easier to handle than a vertical line, and the burden on the worker can be reduced even when the number of measurement points is large. This makes it possible to efficiently measure the distance from the imaginary surface of an uncast concrete area to a target component within the uncast concrete area. [Effects of the Invention]

[0014] According to the present invention, it is possible to efficiently measure the distance from the virtual surface of an un-poured area of ​​concrete to a target component within the un-poured area. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a perspective view schematically showing a bridge having box girders to which the measurement device and measurement method according to the embodiment are applied. FIG. [Figure 2] FIG. 2 is a cross-sectional view schematically showing a part of a construction site where the box girder of FIG. 1 is constructed. [Figure 3] FIG. 3 is an enlarged view of the main part of FIG. 2 before concrete is poured into the upper deck portion. [Figure 4] FIG. 1 is a perspective view showing an unplaced concrete area in a concrete pouring work area. [Figure 5] FIG. 4 is an enlarged view of a main part of FIG. 3. [Figure 6] FIG. 6 is a partial cross-sectional view taken along line VV in FIG. 5. [Figure 7] 10 is a perspective view illustrating an example of a contact portion at the tip of the advancing / retracting member. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the description of the drawings, the same or corresponding elements are designated by the same reference numerals, and duplicate explanations will be omitted as appropriate. The drawings may be partially simplified or drawn in a schematic manner to facilitate understanding, and the dimensional ratios and the like are not limited to those shown in the drawings.

[0017] FIG. 1 is a perspective view schematically showing a bridge having a box girder to which the measuring device and measuring method according to the embodiment are applied. FIG. 2 is a cross-sectional view schematically showing a portion of a construction site where the box girder of FIG. 1 is being constructed. As shown in FIGS. 1 and 2, in this embodiment, the measuring device 100 and measuring method are applied to a construction site A where a concrete structure 1 is being constructed. The concrete structure 1 is, for example, a box girder extending in a bridge axis direction D1. In the concrete structure 1, the box girder is supported by piers 1a extending in a vertical direction D2. FIG. 2 shows a portion of the construction site where the box girder is being constructed, corresponding to the portion enclosed by the dashed line in FIG. 1. The construction site A is, for example, a construction site on a highway. In FIG. 2, hatching of the concrete structure 1 is omitted for ease of illustrating the components.

[0018] The concrete structure 1 has a pair of web portions 2 extending along the vertical direction D2, an upper deck portion 3 extending along the bridge axis direction D1 and the intersecting direction D3 at each upper end of the pair of web portions 2, and a lower deck portion 2a extending along the bridge axis direction D1 and the intersecting direction D3 at the lower ends of the pair of web portions 2. The intersecting direction D3 is a direction intersecting the bridge axis direction D1 and the vertical direction D2. The upper deck portion 3 connects the upper ends of the pair of web portions 2 and protrudes on both sides in the intersecting direction D3 beyond the pair of upper ends. The lower deck portion 2a connects the lower ends of the pair of web portions 2. The web portions 2 may extend at an angle with respect to the vertical direction D2.

[0019] The upper deck slab 3 of the concrete structure 1 is, for example, post-tensioned prestressed concrete. The upper deck slab 3 has, for example, a plurality of PC cable sections 4 extending in the bridge axis direction D1 and a PC cable section 5 extending in the cross direction D3. The plurality of PC cable sections 4 and 5 may be arranged linearly along the horizontal direction, or may be arranged so as to bend at an angle to the horizontal direction at the end of the upper deck slab 3. The top surface 3a of the upper deck slab 3 may be along the horizontal direction, or may be angled relative to the horizontal direction.

[0020] Figure 3 is an enlarged view of the main part of Figure 2 before concrete is poured into the upper deck. Figure 4 is a perspective view showing an unpouring area S of concrete in the pouring work area. In Figure 3, the upper half of the concrete structure 1 (above the wavy line) is depicted as it is before concrete is poured, and the internal components are depicted. For ease of illustration of the components, hatching below the wavy line has been omitted in Figure 3.

[0021] As shown in Figures 2 to 4, at a construction site A where a concrete structure 1 is being constructed, pouring work areas 6 are set up at regular intervals to construct the upper deck slab 3 of a bridge pier under construction. Formwork 7 is set up in the pouring work area 6, and PC cable sections 4 and 5, etc., are placed in predetermined positions within the formwork 7, and concrete is poured. When work in one pouring work area is completed, the worker moves to an adjacent pouring work area and repeats the same work. In this way, the entire concrete of the upper deck slab 3 is constructed. Then, after the concrete has hardened, tension (prestress) is applied to the PC cable sections 4 and 5 with jacks or the like, and the PC cable sections 4 are fixed to the side of the upper deck slab 3 in the bridge axis direction D1, and the PC cable sections 5 are fixed to the end face of the upper deck slab 3 in the cross direction D3 using fixing devices.

[0022] As shown in Fig. 3, the PC cable portion 4 includes a sheath 4b and a PC steel member inserted into the sheath 4b. The PC cable portion 5 includes a sheath 5b and a PC steel member inserted into the sheath 5b. Note that Fig. 3 does not show the PC steel member inserted into the sheaths 4b, 5b. The PC steel member may be any of a PC steel wire, a PC steel strand, a PC steel rod, etc.

[0023] As shown in Figures 3 and 4, a virtual surface 10, which is the virtual top surface of the concrete, is defined in the pouring work area 6 of the upper deck slab 3. The virtual surface 10 is the surface that will become the top surface of the hardened concrete after pouring. Before the concrete is poured, the virtual surface 10 is a surface that coincides with, for example, the position of the top surface of the formwork 7 or the top surface 8 of the existing concrete. In other words, the virtual surface 10 is the virtual top surface of the concrete that constitutes the prestressed concrete. The interior of the formwork 7 is an unpoured area S of concrete.

[0024] In the example of Figure 3, within formwork 7, in order from the imaginary surface 10 side, are arranged reinforcing bars 9a extending in transverse direction D3, reinforcing bars 9b extending in bridge axis direction D1, PC cable section 5, shelf bars 5a supporting PC cable section 5, PC cable section 4, shelf bars 4a supporting PC cable section 4, reinforcing bars 9c extending at a predetermined angle to transverse direction D3, and reinforcing bars 9d extending in bridge axis direction D1. Reinforcing bars 9a and reinforcing bars 9b are bound together to form a lattice pattern. Reinforcing bars 9c and reinforcing bars 9d are bound together to form a lattice pattern.

[0025] The multiple shelf reinforcements 5a extend along the bridge axis direction D1, which intersects with the PC cable portions 5. The multiple shelf reinforcements 5a are arranged parallel to each other and spaced apart in the intersecting direction D3. The PC cable portions 5 are placed on the multiple shelf reinforcements 5a and supported by the shelf reinforcements 5a. Therefore, the position of the PC cable portions 5 in the prestressed concrete (i.e., the position of the PC steel) can be adjusted by the position of the shelf reinforcement 5a (target component). The shelf reinforcement 5a may support multiple PC cable portions 5 (see Figure 6). The multiple shelf reinforcement reinforcements 5a are arranged to support the PC cable portions 5, for example, at intervals of 1 m.

[0026] The multiple shelf reinforcements 4a extend along the intersecting direction D3 that intersects with the PC cable portion 4. The multiple shelf reinforcements 4a are arranged parallel to each other and spaced apart in the bridge axis direction D1. The PC cable portion 4 is placed on top of the multiple shelf reinforcements 4a and is supported by the shelf reinforcements 4a. Therefore, the position of the PC cable portion 4 of the prestressed concrete (i.e., the position of the PC steel) can be adjusted by the position of the shelf reinforcement 4a (target component). The shelf reinforcement 4a may support multiple PC cable portions 4 (see Figure 3). The multiple shelf reinforcement reinforcements 4a are arranged to support the PC cable portions 4 at intervals of, for example, 1 m.

[0027] Here, extremely large forces are applied to the prestressing tendons of the PC cable sections 4 and 5 as prestress. Therefore, even a 1 cm deviation in the position of the PC cable sections, for example, in either the vertical or horizontal direction, can change the eccentricity of the prestressed concrete, potentially resulting in unexpected forces being applied to the concrete structure 1. Therefore, to ensure that the prestressed concrete of the concrete structure 1 performs as designed, it is necessary to properly manage the position (height) of the PC cable sections 4 and 5 (elevation management) with an accuracy of, for example, within ±5 mm. Conventional techniques, such as stretching a vertical line and measuring the depth from the vertical line by placing a scale such as a tape measure vertically, can result in changes in the vertical line height due to, for example, the vertical line sagging or the scale slightly touching the vertical line. A 1-2 mm change in the vertical line height is not negligible when trying to achieve an accuracy of, for example, within ±5 mm, and this is one of the reasons why the measurement process is extremely time-consuming and labor-intensive.

[0028] Furthermore, if there are a large number of support points for the PC cable parts 4 and 5 provided by the shelf reinforcement bars 4a and 5a, the measurement work must be repeated a large number of times. For example, if the length of one side of the un-poured concrete area S is 10 to 15 m, there will be 10 to 15 support points per shelf reinforcement. If there are, for example, eight shelf reinforcement bars 4a and eight shelf reinforcement bars 5a, there will be approximately 100 support points, for a total of approximately 200 support points. For these reasons, it is desirable to not only simplify the measurement work per session, but also to simplify the repeated measurement work by changing the position of the measurement target, thereby enabling efficient measurement overall.

[0029] In managing the positions of the PC cable parts 4, 5, for example, the positions of the reinforcing bars 4a, 5a placed in the un-poured area S of the concrete are measured as the distance (height) from a virtual surface 10, which is the virtual top edge of the concrete. In this embodiment, the distance from the virtual surface 10 to the reinforcing bars 4a, 5a is measured using a measuring device 100 and a measuring method. The points where the reinforcing bars 4a, 5a support the PC cable parts 4, 5 are lined up along the reinforcing bars 4a, 5a, and the vicinity of each support point corresponds to "multiple measurement points lined up along the target component."

[0030] Fig. 5 is an enlarged view of a main part of Fig. 3. Fig. 6 is a partial cross-sectional view taken along line VV in Fig. 5. As shown in Figs. 3 to 6, the measurement device 100 includes an aluminum square tube 11 (reference rigid material) and a gauge section 20 provided on the aluminum square tube 11.

[0031] The aluminum square tube 11 is a specific example of a reference rigid member. The reference rigid member is a member that serves as a reference for measuring the distance from the virtual surface to the target member in the uncast area S along the normal direction of the virtual surface, and is a member with rigidity that prevents deflection due to its own weight from exceeding a certain level. The reference rigid member is preferably a lightweight, highly rigid (e.g., bending rigidity) cross-sectional shape such as a square tube. The reference rigid member is preferably made of a lightweight, highly rigid material such as aluminum, CFRP, or plastic. The length of the aluminum square tube 11 can be, for example, approximately 4 m so that deflection due to its own weight when both ends of the aluminum square tube 11 are supported is negligible.

[0032] The aluminum square tube 11 is laid across so as to be parallel to the imaginary surface 10. In this embodiment, as shown in FIG. 4, one end 12 of the aluminum square tube 11 is placed on the upper end surface of the formwork 7, and the other end 13 is placed on the top surface 8 of the existing concrete, so that the aluminum square tube 11 is laid across so as to be parallel to the imaginary surface 10 (step of laying the reference rigid member). In this embodiment, the bottom surface of the aluminum square tube 11 coincides with the imaginary surface 10. Therefore, the bottom surface of the aluminum square tube 11 coincides with the top surface of the hardened concrete after pouring.

[0033] The square aluminum tube 11 has a rectangular frame-like cross section, and its top and bottom surfaces are parallel to each other. Therefore, the top surface of the square aluminum tube 11 is parallel to the imaginary surface 10 and also to the top surface of the hardened concrete after pouring.

[0034] The aluminum square tube 11 is laid across so that it is parallel to the shelf reinforcement 4a or 5a being measured. Each time the shelf reinforcement 4a or 5a being measured changes, the position of the aluminum square tube 11 is shifted so that it is laid across so that it is parallel to the shelf reinforcement 4a or 5a being measured next. The direction in which the aluminum square tube 11 is laid across may be such that the distance (span) between the supports at both ends of the aluminum square tube 11 becomes shorter in the un-pouring area S of the concrete pouring work area 6. In this case, deflection of the aluminum square tube 11 due to its own weight is more easily suppressed.

[0035] The gauge unit 20 is provided on the aluminum square tube 11 so as to measure the distance from the imaginary surface 10 to the reinforcement bars 4a, 5a in the formwork 7 along the normal direction of the imaginary surface 10. In this embodiment, as shown in Fig. 6, a depth gauge is used as the gauge unit 20.

[0036] The gauge unit 20 has, for example, a pair of trapezoidal base portions 21 on both sides of the advancing / retreating member 22, and an advancing / retreating member 22 extending perpendicular to the pair of base portions 21. The base portions 21 are the main body of the gauge unit 20 and slidably support the advancing / retreating member 22. The lower end surfaces of the pair of base portions 21 may serve as a reference surface that serves as the zero point of the gauge unit 20. The zero point of the gauge unit 20 means a state in which the depth position of the object to be measured is zero when the advancing / retreating member 22 points to zero on the scale. The advancing / retreating member 22 is a part that corresponds to the scale of the gauge unit 20. The advancing / retreating member 22 advances when it is brought closer to the shelf reinforcement 4a or 5a, and retracts when it is moved away from the shelf reinforcement 4a or 5a.

[0037] Here, the gauge unit 20 is attached to the aluminum square tube 11 with its zero point coinciding with the underside of the aluminum square tube 11 so as to measure the distance from the top surface of the hardened concrete to the shelf reinforcement 4a, 5a after concrete is poured (a process of attaching the gauge unit to a reference rigid material). The gauge unit 20 is attached to the aluminum square tube 11 so that the pair of base portions 21 are parallel to the aluminum square tube 11. In this case, the advancing / retracting member 22 is perpendicular to the aluminum square tube 11 and extends along the normal direction of the imaginary surface 10 with the aluminum square tube 11 spanning it. In other words, the gauge unit 20 has the advancing / retracting member 22 extending along the normal direction of the imaginary surface 10.

[0038] The gauge unit 20 may have a display unit 23 that displays the measurement value digitally, for example. When the advancing / retracting member 22 is pressed downward against the base unit 21 with the aluminum square tube 11 stretched across, the length from the bottom surface (zero point) of the aluminum square tube 11 to the tip of the advancing / retracting member 22 is displayed as a digital number on the display unit 23. The digital display of the measurement value makes it easy to visually check the measurement value.

[0039] The gauge section 20 may be provided so as to be slidable along the aluminum square tube 11. Being slidable along the aluminum square tube 11 means that the position of the gauge section 20 relative to the aluminum square tube 11 can be changed without removing the gauge section 20 from the aluminum square tube 11, while the gauge section 20 remains attached to the aluminum square tube 11.

[0040] The gauge section 20 here is attached to the aluminum square tube 11 via a cover plate 30. The cover plate 30 is a plate member that can slide along the aluminum square tube 11. As shown in FIG. 5 , the cover plate 30 has a shape that follows the cross-sectional shape of the upper half of the aluminum square tube 11 when viewed in cross section.

[0041] The cover plate 30 includes an upper plate portion 31 placed on the upper surface of the square aluminum tube 11, a gauge mounting plate portion 32 extending downward from one side end of the upper plate portion 31, and a hook plate portion 33 extending downward from the other side end of the upper plate portion 31. In the example shown in FIG. 5 , the gauge mounting plate portion 32 and the hook plate portion 33 extend parallel to each other and face each other across the upper plate portion 31. The gauge mounting plate portion 32 and the hook plate portion 33 are perpendicular to the upper plate portion 31. The gauge mounting plate portion 32 is a plate-shaped portion of the cover plate 30 to which the gauge portion 20 is attached. The hook plate portion 33 is a portion of the cover plate 30 that hooks onto the square aluminum tube 11 against the weight of the gauge portion 20. The cover plate 30 can be formed, for example, by bending a rectangular stainless steel plate.

[0042] For example, the gauge unit 20 is fixed to the gauge mounting plate portion 32 of the cover plate 30. Screw holes are formed in the base portions 21 of the gauge unit 20. Female threads corresponding to the screw holes in the base portions 21 are formed in the gauge mounting plate portion 32. The pair of base portions 21 of the gauge unit 20 are fastened to the gauge mounting plate portions 32 with screws 24, and the gauge unit 20 is fixed to the cover plate 30. This allows the gauge unit 20 fixed to the cover plate 30 to slide along the aluminum square tube 11 together with the cover plate 30.

[0043] Furthermore, the cover plate 30 is not fixed beyond being placed on the square aluminum tube 11, and is therefore detachable from the square aluminum tube 11. In other words, the cover plate 30 is a detachable member that can be attached to and detached from the square aluminum tube 11. The gauge section 20 is attached to the square aluminum tube 11 via the cover plate 30, which is detachable from the square aluminum tube 11. By using the cover plate 30, for example, instead of sliding the gauge section 20 along the square aluminum tube 11, it can be removed from the square aluminum tube 11 together with the cover plate 30 and easily moved to another position on the square aluminum tube 11.

[0044] The tip 22a of the advancing / retreating member 22 may have an abutting portion 22b that extends parallel to the imaginary surface 10 and abuts against the shelf reinforcement 4a or 5a. FIG. 7 is a perspective view illustrating an example of the abutting portion at the tip of the advancing / retreating member. As shown in FIG. 7, the abutting portion 22b is, for example, a plate-shaped portion that extends so as to intersect (for example, perpendicular to) the advancing / retreating member 22 at the tip 22a of the advancing / retreating member 22. The abutting portion 22b may be attached by welding a plate member to the tip 22a of the advancing / retreating member 22. The abutting portion 22b may also be formed by bending the tip 22a of the advancing / retreating member 22.

[0045] If the abutment portion 22b were not provided, for example, if a situation arose in which the shelf reinforcement 5a was directly below the reinforcing bar 9b and the two overlapped when viewed from the vertical direction D2, the reinforcing bar 9b would be directly above the advancing / retracting member 22. Simply moving the advancing / retracting member 22 directly toward the shelf reinforcement 5a would result in the advancing / retracting member 22 hitting the reinforcing bar 9b and making it impossible to measure the position of the shelf reinforcement 5a. In contrast, if the abutment portion 22b is provided, the advancing / retracting member 22 can be positioned so that the abutment portion 22b can abut against the top or bottom of the shelf reinforcement 5a without hitting the reinforcing bar 9b. If the gauge portion 20 is slidable along the square aluminum tube 11 to achieve such a positional relationship for the advancing / retracting member 22, the abutment portion 22b can be moved closer to the shelf reinforcement 5a while advancing / retracting the advancing / retracting member 22 while maintaining the zero point of the gauge portion 20, which is highly convenient.

[0046] In a measurement operation using the measuring device 100 described above, when the advancing / retracting member 22 is pulled upward relative to the base portion 21 while the aluminum square tube 11 is suspended, the advancing / retracting member 22 retracts below the aluminum square tube 11. In this state, when the gauge portion 20 is slid along the aluminum square tube 11, the advancing / retracting member 22 does not interfere with, for example, the rebars 9a, 9b, or the PC cable portion 5, and the position of the gauge portion 20 relative to the aluminum square tube 11 can be changed while maintaining the zero point of the gauge portion 20. Therefore, the measurement position of the gauge portion 20 can be easily moved one after another while aligning the zero point of the gauge portion 20 with the virtual top surface (virtual surface 10) of the concrete. As a result, it is possible to perform measurement operations using a smaller number of gauge portions 20.

[0047] 3, if the advance / retract amount of the advance / retract member 22 is changed so that the advance / retract member 22 can reach both the shelf reinforcement 4a and the shelf reinforcement 5a, the aluminum square tube 11 can be left suspended parallel to the shelf reinforcement 5a and used for measurements with the shelf reinforcement 4a as the target component. Conversely, the aluminum square tube 11 can be left suspended parallel to the shelf reinforcement 4a and used for measurements with the shelf reinforcement 5a as the target component. However, this is not limited to this; the aluminum square tube 11 can be re-suspended so that it is suspended parallel to the shelf reinforcement 4a when measuring the shelf reinforcement 4a as the target component, and so that it is suspended parallel to the shelf reinforcement 5a when measuring the shelf reinforcement 5a as the target component.

[0048] According to the above-described measuring device 100 and measuring method, the distance from the virtual surface 10 to the shelf reinforcement 4a or 5a in the formwork 7 along the normal direction of the virtual surface 10 is measured by the gauge unit 20. The gauge unit 20 is attached to an aluminum square tube 11 suspended parallel to the virtual surface 10. Compared to a vertical line, the aluminum square tube 11 is less likely to bend under its own weight or external forces, making it easier to maintain a parallel state to the virtual surface 10. This reduces the need for remeasurements due to misalignment compared to using a vertical line as a reference. Furthermore, because the aluminum square tube 11 is less likely to bend than a vertical line, it is easier to handle than a vertical line, reducing the burden on the worker even when the number of measurement points is large. This makes it possible to efficiently measure the distance from the virtual surface 10 of the uncast concrete area S to the shelf reinforcement 4a or 5a in the uncast concrete area S.

[0049] The gauge unit 20 is provided so as to be able to slide along the aluminum square tube 11. As a result, for example, for multiple measurement points lined up along the shelf reinforcement 4a or 5a, the gauge unit 20 can be easily moved to a position corresponding to each measurement point by bridging the aluminum square tube 11 parallel to the shelf reinforcement 4a or 5a and sliding the gauge unit 20 along the aluminum square tube 11. This makes it possible to more efficiently measure the distance from the virtual surface 10 to the shelf reinforcement 4a or 5a.

[0050] The gauge section 20 is attached to the aluminum square tube 11 via a cover plate 30 that is detachable from the aluminum square tube 11. This allows the gauge section 20 to be detachable from the aluminum square tube 11 together with the cover plate 30, so that the gauge section 20 can be moved more easily relative to the aluminum square tube 11 than, for example, when the gauge section 20 is fixed to the aluminum square tube 11.

[0051] The gauge section 20 has an advancing / retreating member 22 that extends along the normal direction of the imaginary surface 10, and a tip 22a of the advancing / retreating member 22 has an abutting portion 22b that extends parallel to the imaginary surface 10 and abuts against the shelf reinforcement 4a or the shelf reinforcement 5a. As a result, even if the shelf reinforcement 4a or the shelf reinforcement 5a is hidden behind another reinforcing bar, for example, by inserting the abutting portion 22b behind the other reinforcing bar, the abutting portion 22b can be brought into abutment against the shelf reinforcement 4a or the shelf reinforcement 5a, making it possible to measure the distance.

[0052] The target components are the reinforcing bars 4a and 5a that support the PC cable sections 4 and 5 of the prestressed concrete, and the imaginary surface 10 is the imaginary top surface of the concrete that makes up the prestressed concrete. This allows the positions of the PC cable sections 4 and 5 to be adjusted by the positions of the reinforcing bars 4a and 5a.

[0053] When measuring with a level line and a ruler or the like, it is difficult for the worker to adjust the height of the shelf reinforcement while holding the ruler or the like by hand. However, with the measuring device 100, when the abutting portion 22b of the gauge portion 20 is abutted against the shelf reinforcement 4a or shelf reinforcement 5a, the advancing / retracting member 22 of the gauge portion 20 can be maintained in that state, which not only makes the measurement highly reproducible, but also makes it easy to adjust the height of the shelf reinforcement 4a or shelf reinforcement 5a while keeping it in that state.

[0054] Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment.

[0055] Although one gauge section 20 is provided in the aluminum square tube 11, a plurality of gauge sections 20 may be provided.

[0056] Although the gauge section 20 is provided slidably along the aluminum square tube 11 in the above embodiment, the present invention is not limited to this example. For example, the gauge section 20 may be provided on the aluminum square tube 11 in a non-sliding manner by being hooked onto a through-hole formed on the side of the aluminum square tube 11 with a hook or the like. The position of the through-hole may correspond to the position and spacing of the target component. In this case, the hook or the like may correspond to a detachable member that is detachable from the aluminum square tube 11.

[0057] In the above embodiment, the gauge section 20 is attached to the square aluminum tube 11 via the cover plate 30, which is detachable from the square aluminum tube 11. However, the present invention is not limited to this example. For example, the gauge section 20 may be fixed directly to the square aluminum tube 11 without any other member.

[0058] Although the square aluminum tube 11 is supported at both ends, it may be supported at a location other than both ends. For example, the square aluminum tube 11 may be supported at an intermediate portion (e.g., the center). The square aluminum tube 11 may be supported at a location other than both ends, for example, by poured concrete or a support rod. In this case, the length of the square aluminum tube 11, taking into account deflection due to its own weight, may be longer than in the above embodiment (e.g., 10 m).

[0059] In the above embodiment, the bottom surface of the aluminum square tube 11 coincides with the virtual surface 10, and the top surface of the aluminum square tube 11 is parallel to the virtual surface 10, but this is not limiting. In short, the reference rigid member should be laid so as to be parallel to the virtual surface of the uncast concrete area S, and a gauge section should be provided on the reference rigid member so that the zero point of the gauge section provided on the reference rigid member is the virtual top surface of the concrete.

[0060] Although a depth gauge has been used as the gauge unit 20, a vernier caliper may be used as the gauge unit 20, with the depth bar of the vernier caliper functioning as the advancing / retreating member. Also, the gauge unit 20 may be of a scale-reading type instead of a digital display.

[0061] In the above embodiment, the measuring device 100 is applied to measure the distance from the virtual top surface of the concrete to the shelf reinforcing bars, but this is not limiting. For example, it may be applied to measure the reinforcing bar cover. In this case, the reinforcing bar placed closest to the virtual top surface of the concrete may be measured. The target component may also be the formwork at the back of the uncast concrete area S. In this case, the depth of the formwork is measured, and the concrete thickness is measured in advance. The target component may also be a bent reinforcing bar (stirrup).

[0062] The measuring device 100 may be used at an angle. For example, it may be used to measure the distance from a vertically extending imaginary surface to a target component in an uncast area S before a vertically extending concrete wall is cast.

[0063] The constituent elements of various aspects of the present invention will be described below. [1] A reference rigid member is laid across the imaginary surface of the uncast concrete area so as to be parallel to the imaginary surface of the uncast concrete area. A measuring device comprising: a gauge portion provided on the reference rigid member so as to measure the distance from the virtual surface to a target component in the uncast area along the normal direction of the virtual surface. [2] The measuring device according to [1], wherein the gauge section is slidably arranged along the reference rigid member. [3] The measuring device according to [1] or [2], wherein the gauge section is attached to the reference rigid member via a detachable member that is detachable from the reference rigid member. [4] the gauge portion has an advancing / retreating member extending along a normal direction of the virtual surface, The measuring device according to any one of [1] to [3], wherein the tip of the advancing / retracting member has a contact portion that extends parallel to the imaginary surface and comes into contact with the target member. [5] The target member is a shelf reinforcement supporting a PC cable portion of prestressed concrete, The measuring device according to any one of [1] to [4], wherein the virtual surface is a virtual top surface of the concrete that constitutes the prestressed concrete. [6] a step of bridging the reference rigid member so as to be parallel to a virtual surface of the uncast concrete area; providing a gauge portion on the reference rigid member so as to measure a distance along a normal direction of the virtual surface; A measurement method comprising a step of measuring the distance from the virtual surface to a target component in the uncast area using the gauge unit. [Explanation of symbols]

[0064] 1...concrete structure, 4, 5...PC cable section, 4a, 5a...shelf reinforcement (target component), 10...virtual surface, 11...aluminum square pipe (reference rigid material), 20...gauge section, 22...advancing / retreating component, 22a...tip, 22b...contact section, 100...measuring device, S...uncast area.

Claims

1. A reference rigid member is laid across the imaginary surface of the uncast concrete area so as to be parallel to the imaginary surface of the uncast concrete area. A measuring device comprising: a gauge portion provided on the reference rigid member so as to measure the distance from the virtual surface to a target component in the uncast area along the normal direction of the virtual surface.

2. The measuring device according to claim 1 , wherein the gauge portion is provided slidably along the reference rigid member.

3. 3. The measuring device according to claim 1, wherein the gauge section is attached to the reference rigid member via a detachable member that is detachable from the reference rigid member.

4. the gauge portion has an advancing / retreating member extending along a normal direction of the virtual surface, The measuring device according to claim 1 , wherein a tip of the advancing / retracting member has a contact portion that extends parallel to the imaginary surface and contacts the target member.

5. The target member is a shelf reinforcement supporting a PC cable portion of prestressed concrete, The measuring device according to claim 1 or 2, wherein the virtual surface is a virtual top surface of the concrete constituting the prestressed concrete.

6. a step of bridging the reference rigid member so as to be parallel to a virtual surface of the uncast concrete area; providing a gauge portion on the reference rigid member so as to measure a distance along a normal direction of the virtual surface; A measurement method comprising a step of measuring the distance from the virtual surface to a target component in the uncast area using the gauge unit.

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