JP2012021319A - Centering fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a centering fixture capable of being fixed to a pile and clearly indicating a center point of the pile easily.SOLUTION: A centering fixture 10 comprises a measurement member 11 having a generally cross shape and an adjusting and fixing member 12 to fix the measurement member 11 to a steel pipe pile. The measurement member 11 comprises a first and second strip-shaped members 111, 112 and they are disposed so that they are orthogonal to each other. The adjusting and fixing member 12 comprises projections 121 provided at both ends of the first and second strip-shaped members 111, 112 and bolts 124 penetrating the projections 121. The projections 121 are mounted by welding or the like so that they protrude from the first and second strip-shaped members 111, 112 to out-of-plane directions.

Description

  The present invention relates to a centering jig for detecting the center position of a structure such as a pile or a buried pipe installed in the ground.

  As described in the background art section of Patent Document 1, the pile constructed in the pile foundation work is the amount of planar displacement relative to the design reference position by the completed survey at the constructed pile head position ( Hereinafter, the amount of eccentricity) is measured. Specifically, as shown in FIG. 13, after marking the reference lines 51 and 52 in the direction orthogonal to the X and Y axes on the leveled concrete surface 50, the center point of the upper end surface of the pile P and the X The component eccentricity amounts ΔX and ΔY between the Y axis reference lines 51 and 52 are measured.

  For example, Patent Literature 2 discloses a measurement auxiliary tool for easily detecting the center point of a pile when performing this measurement. The measurement aid includes a light-transmitting plate, a plurality of concentric circle display portions described on the upper surface of the plate, and a core rod installed at the center of these circles. The light transmissive plate is made of a transparent acrylic plate or the like, and when placed on the upper end surface of the pile, the position of the pile can be visually confirmed. And it becomes possible to detect the position of the center point of a pile easily by making the outer periphery or inner periphery of a pile correspond with the circumference of a concentric circle display part.

  Then, the values of the component eccentricity amounts ΔX and ΔY are entered on the blackboard, and are imprinted on a part of the construction photograph for each pile and are left as a record.

JP-A-8-232265 JP 2004-353208 A

  However, in the measurement auxiliary tool described above, since there is no fixing means for fixing the measurement auxiliary tool to the pile, the measurement auxiliary tool is touched by the operator's contact or wind during measurement of the component eccentricity or during photography. There was a problem that moved. In addition, since an auxiliary worker is required so as not to move, the work is very inefficient due to human labor.

  Then, this invention is made | formed in view of said problem, and it aims at providing the jig | tool for centering which can be fixed to a pile and can detect the center point of a pile easily.

The present invention is a centering jig for detecting the center point of the measurement target surface of the structure,
Marks indicating the circumferential positions of one circle or a plurality of concentric circles having different diameters and the center point of the one circle or the concentric circles are shown, and a measurement member installed on the measurement target surface;
An adjustment fixing member capable of adjusting the position of the measurement member relative to the structure and capable of fixing the measurement member to the structure;
It is characterized by providing.

  In the present invention, the measurement target surface may have a shape having two or more symmetry axes.

In the present invention, the measuring member is
A plurality of belt-shaped members are connected so as to intersect with each other, the mark indicating the center point is provided at the intersecting portion, and the circumferential position of the one circle or the concentric circle is indicated on each belt-shaped member A mark may be shown.

  ADVANTAGE OF THE INVENTION According to this invention, the jig | tool for centering which can be fixed to a pile and detects the center point of a pile easily can be provided.

(A) is a top view which shows the jig | tool for centering concerning 1st embodiment of this invention, (b) is AA sectional drawing of (a). (A) is a top view which shows the state which installed the jig | tool for centering in the steel pipe pile, (b) is BB sectional drawing of (a). It is a side view which shows the case where a long volt | bolt is used. (A) is a top view which shows the jig | tool for centering concerning 2nd embodiment of this invention, (b) is CC sectional drawing of (a). (A) is a top view which shows the state which installed the jig for centering in the steel pipe pile, (b) is EE sectional drawing of (a), (c) is FF sectional drawing of (a). . (A) is a top view which shows the jig | tool for centering concerning 3rd embodiment of this invention, (b) is GG sectional drawing of (a). (A) is a top view which shows the state which installed the jig for centering in the steel pipe pile, (b) is HH sectional drawing of (a), (c) is JJ sectional drawing of (a). . It is a top view which shows the jig | tool for centering concerning 4th embodiment of this invention. It is a top view which shows the state which installed the jig | tool for centering in the steel pipe pile. (A) is a top view which shows the state which connected strip | belt-shaped members with the thumbscrew, (b) is a KK arrow line view of (a). (A) is a top view which shows the state which connected strip | belt-shaped members with the connecting rod, (b) is Q arrow view of (a). It is a figure which shows the other Example of a measurement member. It is a figure which shows the measuring method of the eccentric amount of a pile.

  Hereinafter, preferred embodiments of the centering jig of the present invention will be described in detail with reference to the drawings. In addition, in the following description, the case where the upper end surface of a steel pipe pile is measured as a measurement object surface of a structure is demonstrated.

<About the first embodiment>

  Fig.1 (a) is a top view which shows the jig | tool 10 for centering concerning 1st embodiment of this invention, (b) is AA sectional drawing of (a). Moreover, Fig.2 (a) is a top view which shows the state which installed the centering jig | tool 10 in the steel pipe pile 1, (b) is BB sectional drawing of (a).

  As shown in both drawings, the centering jig 10 includes a measuring member 11 having a substantially cross shape and an adjustment fixing member 12 for fixing the measuring member 11 to the steel pipe pile 1.

  The measurement member 11 includes first and second belt-like members 111 and 112, which are arranged so as to be orthogonal to each other, and the first belt-like member 111 and the second belt-like member 112 are connected by welding or the like. Has been.

  In the present embodiment, steel plates are used as the first and second belt-like members 111 and 112. However, the present invention is not limited to this, and materials such as wood and plastic may be used.

  The first and second belt-like members 111 and 112 have a plurality of circumferential marks 114 that indicate the circumferential positions of a plurality of concentric circles centered on the connection portion.

The diameter of each concentric circle is set so that it may correspond with the internal diameter of the kind of steel pipe pile 1 currently used on the spot. In the present embodiment, the circumferential marks 114 corresponding to the two types of steel pipe piles 1 used in the field are provided, but not limited to this, the diameters of all the general types of steel pipe piles 1 that are commercially available. A large number of circumferential marks 114 may be provided corresponding to the above.
Moreover, in this embodiment, although the circumferential mark 114 corresponding to the several steel pipe pile 1 was each provided, if the steel pipe pile 1 used on the spot is one type, it will be in that steel pipe pile 1 Only the corresponding circumferential mark 114 may be provided.

  Further, in the present embodiment, the marking by the punch is the circumferential mark 114, but the invention is not limited to this. For example, a line may be written with a magic or a seal may be attached.

  At the intersection of the first belt-like member 111 and the second belt-like member 112, a center point mark 116 indicating the center of the concentric circle and a core rod 115 for indicating the position of the center point mark 116 are provided. Is provided. In this embodiment, a rod-like member is attached as the core rod 115, but the present invention is not limited to this, and a flag, a reflecting mirror, or the like may be used.

  The adjustment fixing member 12 includes a protrusion 121 provided at both end edges of the first and second belt-like members 111 and 112, and a bolt 124 that penetrates the protrusion 121.

  The protrusion 121 is attached by welding or the like so as to protrude from the first and second belt-like members 111 and 112 in the out-of-plane direction. However, the present invention is not limited to this, and the protruding portions 121 may be formed by bending both end portions of the first and second belt-like members 111 and 112.

  The protrusion 121 is provided with a hole 122 through which the bolt 124 can be inserted and a nut 123 into which the bolt 124 can be screwed.

  By screwing the bolt 124 into the nut 123 and rotating it in the tightening direction, the bolt 124 moves toward the center of the centering jig 10, and on the other hand, by rotating the bolt 124 in the loosening direction, the bolt 124 is moved. Moves toward the outside of the centering jig 10.

  Next, a method of using the centering jig 10 will be described.

  First, the measuring member 11 of the centering jig 10 is placed on the upper end surface of the steel pipe pile 1 placed in the ground, and the position of the circumferential mark 114 corresponding to the inner diameter of the steel pipe pile 1 is the steel pipe pile. The position of the centering jig 10 is moved so as to coincide with the inner diameter position of 1.

Next, the bolts 124 on both sides of the first belt-like member 111 are rotated in the tightening direction to bring the front end surface of the bolt 124 into contact with the outer peripheral surface of the steel pipe pile 1. At this time, the bolt 124 is loosely tightened to temporarily fix the first belt-like member 111.
Thereafter, the position of the circumferential mark 114 is confirmed, and when it is deviated from the inner diameter position of the steel pipe pile 1, the left and right direction of the first strip member 111 in FIG. 2 while tightening or loosening the bolts 124 on both sides respectively. Fine-tune the position of. Specifically, when the position of the circumferential mark 114 is shifted to the right side of the inner diameter position of the pile steel pipe 1, the first bolt 111 is moved to the left by tightening the right bolt 124 while loosening the left bolt 124. Move. On the other hand, when the position of the circumferential mark 114 is shifted to the left side from the inner diameter position of the pile steel pipe 1, the left bolt 124 is tightened while the right bolt 124 is loosened, and the first strip member 111 is moved to the right.

Next, the bolts 124 on both sides of the second belt-like member 112 are rotated in the tightening direction to bring the front end surface of the bolt 124 into contact with the outer peripheral surface of the steel pipe pile 1. Also at this time, the bolt 124 is loosely tightened to temporarily fix the second belt-like member 112.
Thereafter, the position of the circumferential mark 114 is confirmed, and when it is deviated from the inner diameter position of the steel pipe pile 1, the second belt-like member 112 in FIG. 2A while tightening or loosening the bolts 124 on both sides. Fine-tune the vertical position of. Specifically, when the position of the circumferential mark 114 is shifted to the upper side from the inner diameter position of the pile steel pipe 1, the upper bolt 124 is tightened while loosening the lower bolt 124, and the second belt-shaped member 112 is moved downward. Move. On the other hand, when the position of the circumferential mark 114 is shifted downward from the inner diameter position of the pile steel pipe 1, the first bolt 111 is moved upward by tightening the lower bolt 124 while loosening the upper bolt 124. .

  Finally, while confirming that the position of the circumferential mark 114 and the inner diameter position of the steel pipe pile 1 coincide with each other, the bolts 124 on both sides of the first and second strip members 111 and 112 are finally tightened, and the core The feeding jig 10 is firmly fixed to the steel pipe pile 1.

  As described above, by matching the positions of the circumferential marks 114 described in the first and second belt-like members 111 and 112 with the inner diameter of the steel pipe pile 1, the core rod 115 becomes the center of the steel pipe pile 1. It will be located at a point.

  Therefore, the position coordinates of the core rod 115 can be measured by a measuring means such as a light wave distance meter, and this measured value can be obtained as the position coordinates of the center point of the steel pipe pile 1. Then, the component eccentricity amounts ΔX, ΔY, etc. between the position coordinates and the X and Y axis reference lines are measured, and a photograph taken on the blackboard is taken. In the present embodiment, the optical distance meter is used as the measuring means, but the present invention is not limited to this, and a transit, a tape measure, or the like may be used.

  By the way, when detecting the center point of the steel pipe pile 5 with a small diameter, the centering jig 10 may be fixed to the steel pipe pile 1 using a bolt 125 having a long threaded portion as shown in FIG.

<About the second embodiment>

  Next, a second embodiment of the present invention will be described. The centering jig 20 of this embodiment is for detecting the center point of the steel pipe pile 2 having a rectangular cross section.

  In the following description, portions corresponding to the first embodiment are denoted by the same reference numerals, description thereof is omitted, and differences are mainly described.

  FIG. 4A is a plan view showing a centering jig 20 according to the second embodiment of the present invention, and FIG. 4B is a sectional view taken along the line CC in FIG. 5A is a plan view showing a state in which the centering jig 20 is installed on the steel pipe pile 2, FIG. 5B is a sectional view taken along line EE in FIG. 5A, and FIG. 5C is F in FIG. It is -F sectional drawing.

  As shown in both figures, a circumferential mark 214 is described at a circumferential position of a concentric circle centering on a connection portion between the first belt-like member 111 and the second belt-like member 112.

The diameters of the concentric circles coincide with the long side dimension L and the short side dimension S of the steel pipe pile 2.
In addition, in this embodiment, in order to make description easy, although the case where it applied to one kind of steel pipe pile 2 was demonstrated, it is not limited to this, When using the several steel pipe pile 2 from which a dimension differs May be provided with a circumferential mark 214 corresponding to each.

  The adjustment fixing member 12 includes a bolt 124 that penetrates the protrusion 121 of the first belt member 111 and a bolt 125 that penetrates the protrusion 121 of the second belt member 112.

  The second belt-like member 112 is arranged so that the side surface on the short side of the steel pipe pile 2 is sandwiched between the protrusions 121 of the second belt-like member 112 provided with the bolt 125 longer than the bolt 124.

  Next, a method for using the centering jig 20 will be described.

  First, the measuring member 11 of the centering jig 20 is placed on the upper end surface of the steel pipe pile 2, and the positions of the circumferential marks 214 corresponding to the long side inner circumference and the short side inner circumference of the steel pipe pile 2 are placed. Move the position of the centering jig 20 so as to coincide with the inner peripheral position on the long side and the inner peripheral position on the short side of the steel pipe pile 2, respectively.

  Next, as in the first embodiment, the bolts 124 and 125 on both sides of the first and second belt-like members 111 and 112 are respectively rotated in the tightening direction so that the tip surfaces of the bolts 124 and 125 are the outer periphery of the steel pipe pile 2. The surface is brought into contact with the surface, and after fine adjustment, the centering jig 20 is firmly fixed to the steel pipe pile 2 by performing final tightening.

  By aligning the position of the circumferential mark 214 described in the first and second belt-like members 111 and 112 with the long-side inner peripheral position and the short-side inner peripheral position of the steel pipe pile 2, the core rod 115 is It will be located at the center point of the steel pipe pile 2.

<About the third embodiment>

  Next, a third embodiment of the present invention will be described. The centering jig 30 of this embodiment is for detecting the center point of the steel pipe pile 3 having an elliptical cross section.

  FIG. 6A is a plan view showing a centering jig 30 according to the third embodiment of the present invention, and FIG. 6B is a GG sectional view of FIG. 7A is a plan view showing a state in which the centering jig 30 is installed on the steel pipe pile 3, FIG. 7B is a cross-sectional view taken along the line H-H in FIG. 7A, and FIG. -J sectional drawing.

  As shown in both figures, a circumferential mark 314 is described at a circumferential position of a concentric circle centering on a connection portion between the first belt-like member 111 and the second belt-like member 112.

Each diameter of the concentric circles coincides with the long side dimension M and the short side dimension N of the steel pipe pile 3.
In addition, in this embodiment, in order to make description easy, although the case where it applied to one kind of steel pipe pile 3 was demonstrated, it is not limited to this, The several steel pipe pile from which the length of each side differs When 3 is used, a circumferential mark 314 corresponding to each of them may be provided.

<About the fourth embodiment>

  Next, a fourth embodiment of the present invention will be described. The centering jig 40 of this embodiment is for detecting the center point of a steel pipe pile 4 having a regular polygonal cross section, for example, a regular hexagon.

  FIG. 8 is a plan view showing a centering jig 40 according to the fourth embodiment of the present invention. FIG. 9 is a plan view showing a state in which the centering jig 40 is installed on the steel pipe pile 4.

  As shown in both drawings, the centering jig 40 includes a trident measuring member 11 and an adjustment fixing member 12.

  The measuring member 11 includes first to third belt-like members 411 to 413, and these end portions are connected to each other. In the present embodiment, the first to third strip members 411 to 413 are connected by welding or the like at equal intervals of 120 ° in the circumferential direction.

  Further, each belt-like member 411 to 413 is provided with a circumferential mark 414 indicating the circumferential position of a circle having the connection point of the first to third belt-like members 411 to 413 as a center point. This circle is an inscribed circle that is inscribed in the steel pipe pile 4, and is in contact with each side at the midpoint 42 position of each side of the steel pipe pile 4.

  Next, a method of using the centering jig 40 will be described.

  First, the measuring member 11 of the centering jig 40 is placed on the upper end surface of the steel pipe pile 4 so that the position of the circumferential mark 414 coincides with the midpoint 42 position of each side of the inner circumference of the steel pipe pile 4. The position of the centering jig 40 is moved.

  Next, the bolts 124 of the first strip member 411 are loosely tightened so that the first strip member 411 is temporarily fixed. Further, the bolts 124 on both sides of the second and third strip members 412, 413 are loosely tightened to finely adjust the positions of the second and third strip members 412, 413.

  Finally, while confirming that the position of the circumferential mark 414 coincides with the position of the midpoint 42 of each side, the bolts 124 of the first to third belt-like members 411 to 413 are finally tightened, and the core The feeding jig 40 is firmly fixed to the steel pipe pile 4.

  By matching the positions of the circumferential marks 414 described in the first to third belt-like members 411 to 413 with the midpoints 42 of the respective sides of the steel pipe pile 4, the core rod 115 becomes the center of the steel pipe pile 4. It will be located at a point.

  In the present embodiment, the case of a regular hexagon has been described. However, the present invention is not limited to this, and may be a regular N-gon (where N is a natural number of 3 or more).

  In addition, although this embodiment demonstrated the case where three strip | belt-shaped members 411-413 were used, it is not limited to this, The number of strip | belt-shaped members is determined suitably according to the shape of the end surface of the steel pipe pile 4. To do.

  According to the centering jigs 10, 20, 30, and 40 in the above-described embodiments, the centering jigs 10, 20, 30, and 40 can be fixed to the steel pipe piles 1 to 5, respectively. The centering jigs 10, 20, 30, and 40 are not displaced due to the contact of workers, wind, etc. This allows one person to perform operations such as measurement of component eccentricity and photography. Therefore, the centering operation can be performed efficiently.

  In addition, in each embodiment mentioned above, although the end surface shape of the steel pipe piles 1-5 was each demonstrated in the case of a circle, an ellipse, a rectangle, and a regular N square (however, N is a natural number of 3 or more), it is limited to this. The cross-sectional shape is not limited to the above, and may be any cross-sectional shape having two or more symmetry axes, and can be applied to, for example, a rhombus other than the end face shape described above.

  Moreover, in each embodiment mentioned above, although the case where the center point of the hollow steel pipe piles 1-5 was detected was demonstrated, it is not limited to this, It applies also to the solid steel pipe piles 1-5. be able to.

  Moreover, in each embodiment mentioned above, although the case where the center point of the steel pipe piles 1-5 arrange | positioned perpendicularly was demonstrated, it is not limited to this, The steel pipe pile installed horizontally or diagonally 1 to 5 can also be applied.

  Moreover, in each embodiment mentioned above, although the case where the steel pipe piles 1-5 were used as a structure was demonstrated, it is not limited to this, For example, it applies also to a buried pipe, a column, a beam, etc. be able to.

  In each of the above-described embodiments, the case where the plurality of belt-like members 111, 112, etc. are welded has been described. For example, as shown in FIG. 10, the first and second belt-like members 111, 112 are connected to each other with a thumbscrew 6, and when the thumbscrew 6 is loosened, the mechanism is rotated and fixed when the thumbscrew 6 is tightened. As shown in FIG. 11, it is normally rotatable, and a substantially U-shaped connecting rod is inserted into the hole 8 of the bracket 7 provided on the side surface of the first and second belt-like members 111 and 112. It is good also as a mechanism in which the 1st and 2nd strip | belt-shaped members 111 and 112 are fixed in the state which made | formed the predetermined angle by inserting 9. FIG. By making the first and second belt-like members 111 and 112 pivotable, even if a reinforcing bar or the like protrudes upward from the upper end surface of the steel pipe piles 1 to 5, the reinforcing bar or the like is displaced to centering jig 10, 20, 30, 40 can be mounted.

  Moreover, in each embodiment mentioned above, although the case where the some strip | belt-shaped member 111,112 etc. were connected as the measurement member 11 was demonstrated, it is not limited to this, For example, as shown in FIG. The protrusion 121 may be erected along the peripheral edge of the circular plate 21. In such a case, the protrusion 121 is provided with a bolt 124 and a nut 123 as in the above-described embodiments. The positions where the bolts 124 and the nuts 123 are attached are determined by design or the like as appropriate according to the shape of the measurement target surface.

1, 2, 3, 4, 5 Steel pipe pile 6 Thumb screw 7 Bracket 8 Hole 9 Connecting rod 10 Centering jig 11 Measuring member 111 First strip member 112 Second strip member 114 Circumferential mark 115 Core rod 116 Center point mark 12 Adjustment fixing member 121 Protruding portion 122 Hole 123 Nut 124, 125 Bolt 20 Centering jig 21 Disk 214 Circumferential mark 30 Centering jig 314 Circumferential mark 40 Centering jig 411 No. One strip member 412 Second strip member 413 Third strip member 414 Circumferential mark 42 Midpoint 50 Leveling concrete surface 51, 52 Reference line

Claims (3)

A centering jig for detecting a center point of a measurement target surface of a structure,
Marks indicating the circumferential positions of one circle or a plurality of concentric circles having different diameters and the center point of the one circle or the concentric circles are shown, and a measurement member installed on the measurement target surface;
An adjustment fixing member capable of adjusting the position of the measurement member relative to the structure and capable of fixing the measurement member to the structure;
A centering jig characterized by comprising: The measurement target surface is
The centering jig according to claim 1, wherein the jig has a shape having two or more symmetry axes. The measuring member is
A plurality of belt-shaped members are connected so as to intersect with each other, the mark indicating the center point is provided at the intersecting portion, and the circumferential position of the one circle or the concentric circle is indicated on each belt-shaped member The centering jig according to claim 1 or 2, wherein a mark is shown.

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