JP2018131803A - Temporary fastening jig and temporary fastening method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate a connection of a lower piece to an upper piece.SOLUTION: A temporary fastening jig (100) for temporarily fastening a lower piece of pieces mutually assembled in a vertical direction to an upper piece has a main body part (1) inserted through a hole formed in a flange of a piece in contact with each other, and a head part (4) connected to the main body part (1) and abutting against a flange of the upper piece. The main body part (1) has an engaging member (13) which is movable forward and backward with respect to an outer peripheral surface (1b) of the main body part (1) and projects outwardly from the hole when advancing, and an adjustment part (6) for adjusting the distance (d) between the head part (4) and the engaging member (13).SELECTED DRAWING: Figure 2

Description

  The present invention relates to a temporary fixing jig for temporarily fixing a lower piece to an upper piece among pieces assembled together in the vertical direction, and a temporary fixing method for temporarily fixing pieces in the vertical direction using the temporary fixing jig. .

2. Description of the Related Art Conventionally, when a shaft is constructed, a liner plate (piece) that is connected along the wall surface of the shaft from the top to the bottom every time the shaft is dug to form a retaining wall is known. The outer peripheral edge of the piece is surrounded by a flange, and a plurality of holes are formed in the upper and lower flanges of the flange.
The earth retaining wall made of pieces, for example, installs a wall made of the uppermost piece so as to cover the inner wall surface of an excavation hole formed by digging the ground surface shallowly. Thereafter, the lower piece is sequentially connected below the installed upper piece so as to cover the inner wall surface of the excavation hole while further digging the ground surface (see, for example, Patent Document 1).

JP 2002-295170 A

By the way, when connecting the lower piece to the upper piece from below, a chain or a jack may be attached to the lower piece and the lower piece may be lifted by the jack. The upper flange of the lower piece in the suspended state is brought into contact with the lower flange of the upper piece so that the holes formed in both flanges are aligned with each other. The upper and lower pieces are connected to each other by inserting a bolt through the holes of the upper and lower flanges aligned with each other and fastening a nut to the bolt.
However, in the conventional connection method, a chain, a jack, or the like is required to lift the lower piece. In addition, it is necessary to attach the chain to each piece, or to suspend the piece to which the chain is attached one by one with a jack. In addition, this work required a plurality of workers.

  Then, this invention is made | formed in view of the said subject, and is providing the temporary fixing jig and temporary fixing method which make easy connection of the lower piece to an upper piece.

  In order to solve the above-mentioned problem, the present invention is a temporary fixing jig for temporarily fixing a lower piece to an upper piece among pieces assembled together in the vertical direction, and is formed on a flange between the pieces in contact with each other. A main body that is inserted through the hole and a head that is connected to the main body and contacts the flange of the upper piece; the main body is movable forward and backward with respect to the outer peripheral surface of the main body; An engagement member that projects outward from the hole is provided, and an adjustment unit that adjusts a distance between the head and the engagement member is provided.

  In addition, the adjusting portion includes a shaft portion of the head having a first thread formed on the outer peripheral surface, and a second screw thread that accommodates the shaft portion and engages the first thread on the inner peripheral surface. It is preferable that the main body portion is formed with a housing portion.

  In addition, the adjusting portion includes a cylindrical shape and an outer peripheral surface on which an inner peripheral surface is formed with a first screw thread and an outer peripheral surface on which a second screw thread is engaged. It is preferable to provide the said main-body part.

  Moreover, it is preferable that the said main-body part is provided with the urging mechanism which urges | biases the said engaging member so that it may engage with the said engaging member and it protrudes toward the exterior from the inside of the said main-body part.

  Moreover, it is preferable to provide the pressing member which contacts the said engaging member in one end, and retracts this engaging member.

  Further, a rotary operation unit for operating the advancement and retraction of the engagement member, and one end connected to the operation unit, and the other end engaged with the engagement member to rotate the operation unit. It is preferable to provide a connecting portion that converts into advancing and retracting motion.

  Furthermore, in order to solve the above-described problem, the present invention is a temporary fastening method in which the lower piece is temporarily fastened to the upper piece using a temporary fastening jig, and the lower piece approaches the upper piece. And aligning the holes formed in the flanges with each other, and inserting the temporary fixing jig into the holes aligned with each other to engage the engaging member with the flange of the lower piece. And a process.

  Further, in a state where the engaging member is engaged with the flange of the lower piece, the upper piece and the lower piece are brought into contact with each other, and the adjustment portion is adjusted to adjust the head and the engaging member. It is preferable to provide a step of holding the flange between the head and the engagement member by narrowing the gap between the head and the engagement member.

  The present invention facilitates connection of the lower piece to the upper piece.

It is a figure which shows the state which temporarily fastened the lower piece to the upper piece. It is a figure for demonstrating the structure of the temporary fixing jig which concerns on 1st Embodiment. It is a figure for demonstrating the method of temporarily fixing a lower piece to an upper piece with the temporary fixing jig shown in FIG. It is the elements on larger scale for demonstrating the process of a temporary fixing method. It is a figure for demonstrating the structure of the temporary fixing jig which concerns on 2nd Embodiment. It is a figure for demonstrating the structure of the temporary fixing jig which concerns on 3rd Embodiment.

A preferred embodiment of the present invention will be described with reference to the drawings. The following embodiment is merely an example, and various embodiments can be employed within the scope of the present invention.
<First Embodiment>
FIG. 1 is a diagram illustrating a state where a lower piece is temporarily fastened to an upper piece. FIG. 2 is a diagram for explaining the configuration of the temporary fixing jig according to the first embodiment, and FIG. 2A is a partial perspective view of the temporary fixing jig viewed from the peripheral surface side. 2 (b) is a plan view of the main body portion of the temporary fixing jig, FIG. 2 (c) is a partial perspective view of the main body portion viewed from the peripheral surface side, and FIG. It is a side view of the head of a temporary fixing jig.

As shown in FIG. 1, for example, when the shaft is excavated, the temporary fixing jig 100 allows liner plates (pieces) constituting the retaining wall body along the inner wall surface of the shaft to be aligned in the axial direction of the shaft. Temporarily fasten to connect. The retaining wall body is a so-called by connecting the lower liner plate (lower piece) P2 from the lower side to the upper liner plate (upper piece) P1 while digging the shaft from the top to the bottom. It is built by the reverse winding method.
For convenience of explanation, the configuration of the upper piece P1 and the lower piece P2 that are temporarily fixed by the temporary fixing jig 100 will be described first. In addition, since the structure of the upper piece P1 and the lower piece P2 is the same, both are demonstrated collectively.
As shown in FIG. 1, each of the upper piece P1 and the lower piece P2 is provided along the inner surface of the shaft, and the plates P11 and P21 facing the inner surface of the shaft and the edges of the plates P11 and P21. Equipped with standing flanges P12, P13; P22, P23.

The plates P11 and P21 are formed in a rectangular shape in plan view. For example, the plates P11 and P21 are formed by curving a steel plate in a wave shape along the short side direction and in a circular arc shape along the longitudinal direction. is there. The plates P11 and P21 are not limited to those formed by being bent into a wave shape or an arc shape, and may be formed in a flat plate shape.
The flanges P12 and P22 are provided at two edge portions on the long side of the plates P11 and P21, and are erected with respect to the plates P11 and P21 (hereinafter also referred to as “longitudinal flanges”). Bolts that connect the upper and lower pieces P1, P2 adjacent to each other in the axial direction (height direction) of the shaft are inserted into the longitudinal flange P12 of the upper piece P1 and the longitudinal flange P22 of the lower piece P2. A plurality of holes P12a, P22a are formed along the extending direction of the longitudinal flanges P12, P22.
The flanges P13 and P23 are provided at two short edges of the plates P11 and P21 and are erected with respect to the plates P11 and P21 (hereinafter also referred to as “short flanges”). Each of the short flanges P13 and P23 has a plurality of holes P13a and P23a through which bolts that connect the upper piece P1 and the lower piece P2 adjacent to each other in the circumferential direction are inserted into the short flanges P13 and P23. It is formed along the current direction.

[Configuration of temporary fixing jig]
The temporary fastening jig 100 is made of steel, and is formed on the longitudinal flanges P12 and P22 of the upper piece P1 and the lower piece P2 that are connected to each other in the vertical direction of the shaft as shown in FIG. 2A. The distance between the main body 1 inserted through the holes P12a and P22a, the head 4 connected to the main body 1 and contacting the inner surface of the flange P12 of the upper piece P1, and the distance d between the main body 1 and the head 4 is given. And a rotary adjustment unit 6 for adjustment.

(Main body)
As shown in FIGS. 2A to 2C, the main body 1 is made of steel and has a substantially cylindrical shape. The distal end side of the main body 1 in the insertion direction I of the longitudinal flanges P12, P22 of the upper and lower pieces P1, P2 into the holes P12a, P22a has an inclined portion 1a inclined toward the center of the main body 1.
The main body 1 is inserted through holes P12a and P22a in the longitudinal flanges P12 and P22 of the upper and lower pieces P1 and P2, respectively. The main body portion 1 includes a housing portion 11 formed at the center portion along the axis x, and an engagement member 13 that can be moved back and forth with respect to the outer peripheral surface 1b.
The accommodating part 11 accommodates the axial part 43 of the head 4 mentioned later. A thread (for example, female thread) 11 a is formed on the inner peripheral surface of the accommodating portion 11.

The engaging members 13 are formed of a steel plate and are provided on the outer peripheral surface of the main body 1 at regular intervals. In the illustrated embodiment, four engaging members 13 are provided, but the number of engaging members 13 and the interval between them can be arbitrarily set.
The engaging member 13 projects from the outer peripheral surface 1 b of the main body 1 so as to extend obliquely outward from the inclined portion 1 a side of the main body 1 to the opposite side to the insertion direction I. The engaging member 13 has a flat surface 13 b that extends perpendicularly to the outer peripheral surface 1 b of the main body 1 and faces the head 4 continuously to the portion 13 a that projects obliquely. The flat surface 13b contacts the inner surface of the upper longitudinal flange P22 of the lower piece P2.
The engaging member 13 is accommodated in an opening (not shown) formed in the outer peripheral surface 1b of the main body 1 so as to be able to advance and retract. For example, the engaging member 13 is pivotally supported inside the main body 1 so that one end on the inclined portion 1a side can turn. The engaging member 13 is urged by an urging means such as a spring provided inside the main body 1 and protrudes from the outer peripheral surface 1b of the main body 1 around the pivotally supported point. The engagement member 13 protrudes outward from the outer peripheral surface 1b of the main body 1 in a state where no external force is applied (natural state), and in a state where an external force is applied (load state). Is partially retracted (withdrawn) into the main body 1.
The biasing means of the engaging member 13 is not limited to a spring, and a known biasing means can be used.

(head)
As shown in FIG. 2D, the head 4 includes a contact portion 41 and a shaft portion 43 formed integrally with the contact portion 41.
The contact portion 41 has a contact surface 41 a that faces the main body portion 1 and is integrally formed with the shaft portion 43. The contact surface 41a is an inner surface of the lower longitudinal flange P12 on the lower side of the upper piece P1 when the temporary fixing jig 100 is inserted into the holes P12a and P22a of the longitudinal flanges P12 and P22 of the upper and lower pieces P1 and P2. Abut. The contact surface 41a is substantially parallel to the flat surface 13b of the engagement member 13.
The shaft portion 43 has an outer diameter smaller than the outer diameter of the contact portion 41 and is accommodated in the accommodating portion 11 of the main body portion 1. A thread (for example, male thread) 43 a is formed on the outer peripheral surface of the shaft portion 43. The male screw thread 43a of the shaft part 43 is screwed with the female screw thread 11a of the housing part 11 of the main body part 1, so that the main body part 1 and the head part 4 are connected to each other.

(Adjustment part)
The adjusting unit 6 includes an interval between the main body 1 and the head 4, specifically, a flat surface 13 b in the engaging member 13 of the main body 1 and an abutting surface 41 a in the abutting portion 41 of the head 4. Adjust the distance d between. The adjusting portion 6 accommodates the shaft portion 43 of the head 4 on which the male screw thread 43a is formed, and the female screw thread 11a that engages the male screw thread 43a on the inner peripheral surface. And a housing portion 11 of the main body 1. More specifically, the adjustment unit 6 includes a female thread 11 a in the housing part 11 of the main body 1 and a male thread 43 a in the shaft part 43 of the head 4.
The adjusting part 6 rotates the head part 4 in one direction around the axis line x, so that the shaft part 43 of the head part 4 enters or advances with respect to the housing part 11 of the main body part 1, and the interval d is set. It is designed to narrow and widen.

[Method of temporary fixing]
Next, a method of temporarily fastening the lower piece P2 to the upper piece P1 using the temporary fastening jig 100 will be described with reference to FIGS.
FIG. 3 is a view for explaining a method of temporarily fastening the lower piece to the upper piece by the temporary fastening jig. FIG. 4 is an enlarged view for explaining a process of temporarily fixing the lower piece to the upper piece by the temporary fixing jig, and FIG. 4 (a) is a temporary fixing before being inserted into the upper and lower pieces. FIG. 4B is a diagram illustrating a temporary fixing jig in the middle of insertion, and FIG. 4C is a diagram illustrating the temporary fixing jig after insertion. (D) is a figure which shows the temporary fixing jig of the state which adjusted the adjustment part.
As shown in FIG. 3, the upper piece P1 and the lower piece P2 are arranged in a so-called staggered manner so that the positions of the short flanges P13 and P23 are shifted.

First, as shown in FIG. 3, the worker lifts the lower piece P2 to approach the upper piece P2 (indicated by an arrow F). Next, as shown in FIG. 4A, the upper longitudinal flange P22 of the lower piece P2 is brought into contact with the lower longitudinal flange P12 of the upper piece P1, and the lower longitudinal flange P12 of the upper piece P1 is contacted. The hole P12a is aligned with the hole P22a of the upper longitudinal flange P22 of the lower piece P2. In this state, the temporary fixing jig 100 is inserted into the two holes P12a and P22a formed near the side end in the circumferential direction of the lower piece P2.
Since it is inserted from the inclined portion 1a on the distal end side in the insertion direction I of the main body portion 1 and the portion 13a side of the engaging member 13 projecting obliquely, a temporary fixing jig to the holes P12a and P22a of the longitudinal flanges P12 and P22 100 body parts 1 can be easily inserted.
Further, the temporary fastening jig 100 rotates the adjusting portion 6 during insertion so that the distance d between the engaging member 13 of the main body 1 and the head 4 is larger than the plate thickness of at least two longitudinal flanges P12 and P22. It is preferable to make it sufficiently large.

As shown in FIG. 4B, when the main body 1 is inserted through the holes P12a and P22a, the engaging member 13 comes into contact with the inner peripheral walls of the holes P12a and P22a and urges the main body 1 inside. It is pushed (retracted) against the biasing force of the means. As shown in FIG. 4 (c), when the main body 1 passes through the holes P12a and P22a, the engaging member 13 is biased from the inside of the main body 1 toward the outside, so that the periphery of the holes P12a and P22a. Overhang outside.
Even if the worker releases his hand from the lower piece P2 in a state where the flat surface 13b of the engagement member 13 of the temporary fastening jig 100 is in contact with the inner surface of the longitudinal flange P22 of the lower piece P2, the lower piece P2 is The state of being temporarily fastened to the upper piece P1 and suspended in the air is maintained. That is, the lower piece P2 does not fall from the upper piece P1. Thus, the temporary fastening of the upper piece P1 and the lower piece P2 by the temporary fastening jig 100 is completed.

In a state where the lower piece P2 is temporarily fastened, there is a space S between the lower piece P2 and the upper piece P1. The operator further lifts the lower piece P2 slightly to bring the longitudinal flange P22 into contact with the longitudinal flange P12 of the upper piece P1, and as shown in FIG. The contact part 41 is turned. By rotating the contact portion 41, the shaft portion 43 of the head portion 4 constituting the adjusting portion 6 is caused to enter the housing portion 11 of the main body portion 1.
Thereby, the space | interval d between the contact surface 41a of the contact part 41 and the flat surface 13b of the engaging member 13 becomes narrow, and substantially corresponds to the thickness of the longitudinal flanges P12 and P22. That is, in the temporary fixing process, the longitudinal flange P22 of the lower piece P2 may be brought into close contact with the longitudinal flange P12 of the upper piece P1.
With the temporary fixing jig 100, the temporary fixing of the lower piece P2 with respect to the upper piece P1 can be easily and quickly performed without using a conventionally required chain or jack.

After the upper and lower pieces P1 and P2 are temporarily fixed by the temporary fixing jig 100, bolts B are inserted into all the holes P12a and P22a of the longitudinal flanges P12 and P22 through which the temporary fixing jig 100 is not inserted, and the nut N It is concluded. Since the adjustment portion 6 allows the longitudinal flange P12 of the upper piece P1 and the longitudinal flange P22 of the lower piece P2 to be in close contact with each other, the upper piece P1 and the lower piece P2 can be connected by the bolt B. It becomes easy.
The adjustment part 6 is adjusted, that is, the head part 4 is rotated to advance the shaft part 43 from the housing part 11 and the engagement member 13 is pushed into the main body part 1 to engage with the lower piece P2. Can be easily pulled out. The bolt B is inserted into the holes P12a and P22a after the temporary fixing jig 100 is pulled out, and the nut N is fastened to the bolt B. Thereby, the connection of the lower piece P2 to the upper piece P1 is completed.

[Others]
In addition, since the temporary fixing jig 100 provided with the adjustment part 6 can change freely the space | interval d between the contact surface 41a of the contact part 41, and the flat surface 13b of the engaging member 13, temporarily. Even when it is necessary to install a reinforcing steel (not shown) between the upper piece P1 and the lower piece P2, it is possible to respond flexibly.
Further, if the temporary fastening jig 100 has the same strength as the bolt B and the nut N that fasten the upper piece P1 and the lower piece P2, the temporary fastening jig 100 has two functions of temporary fastening and fastening. It can also bear.

Further, when the temporary fastening jig 100 is inserted into the upper piece P1 and the lower piece P2, the distance between the longitudinal flange P12 of the upper piece P1 and the longitudinal flange P22 of the lower piece P2 is determined by the temporary fastening jig 100. If the distance d between the contact surface 41a of the contact portion 41a and the flat surface 13b of the engagement member 13 is smaller than the distance d, the longitudinal flanges P12 and P22 do not need to be contacted.
Further, the temporary fastening jig 100 is inserted in advance into the hole P12a of the lower longitudinal flange P12 of the upper piece P1, and the lower piece P2 is lifted from below to open the hole P22a of the upper longitudinal flange P22 of the lower piece P2. Alternatively, the temporary fastening jig 100 may be inserted into the upper piece P1 to temporarily fix the lower piece P2. In this case, the head 4 of the temporary fixing jig 100 may be suppressed from above.

<Second Embodiment>
Next, a temporary fixing jig 200 according to the second embodiment will be described with reference to FIG. In particular, a configuration of the temporary fixing jig 200 different from the temporary fixing jig 100 according to the first embodiment will be described. FIG. 5 is a view for explaining the temporary fixing jig according to the second embodiment, and FIG. 5A is a view showing a state in which the engaging member protrudes from the outer peripheral surface of the main body. FIG. 5B is a diagram illustrating a state in which the engaging member is drawn into the main body.

As shown in FIG. 5, the temporary fixing jig 200 includes a main body part 210, a head part 240, and an adjustment part 260.
The main body 210 has a thread (for example, a male thread) 211 formed on the outer peripheral surface opposite to the inclined portion 210a. The main body 210 has an accommodating portion 212 that accommodates a part of a knock mechanism described later. The engagement member 213 of the main body 210 includes a portion 213a and a flat surface 213b that project obliquely. In the temporary fastening jig 200, the engagement member 213 is advanced and retracted with respect to the main body 210 by a known knock mechanism.

For example, the knock mechanism includes a pressing member 270 that can freely enter and leave the end of the main body 210 opposite to the inclined portion 210 a, and a compression coil spring that urges the pressing member 270 outward with respect to the main body 210. 280, and a locking projection 290 provided on the bottom of the main body 210 to lock the pressing member 270.
The pressing member 270 is formed integrally with the pressing button 271 exposed from the main body 210, the shaft portion 272 attached to the pressing button 271, and the shaft portion 271 on the opposite side of the pressing button 271. And a contact portion 273 that is in contact with the joint member 213.
The compression coil spring 280 is fitted on the outer periphery of the shaft portion 272 of the pressing member 270 and is accommodated in the accommodating portion 212 of the main body portion 210. The compression coil spring 280 is supported between the surface of the pressing button 271 that faces the housing portion 212 of the main body 210 and the bottom surface of the housing portion 212.

As shown in FIG. 5A, when the pressing button 271 is not pressed, the pressing member 270 is pushed up by the compression coil spring 280, and the engaging member 213 protrudes from the outer peripheral surface of the main body 210. ing.
As shown in FIG. 5B, in a state where the pressing button 271 is pressed, the contact portion 273 pulls the engaging member 213 into the main body portion 210 as the shaft portion 272 moves along the axis x, and The pressing member 270 is locked by engaging with the stop protrusion 290. By pressing the pressing button 271 again, the engagement between the contact portion 273 and the locking projection 290 is released, and the compression coil spring 280 pushes up the pressing member 270. As a result, the engagement member 213 protrudes outside the main body 210 again.

The head 240 is formed, for example, as a hollow cylindrical member, and has a contact surface 240 a on the side facing the tip of the main body 210. A thread (for example, female thread) 241 is formed on the inner peripheral surface of the hollow portion of the head 240. That is, in the temporary fastening jig 200, the adjustment portion 260 is configured by the male thread 211 of the main body 210 and the female thread 241 of the head 240.
When temporarily fastening the lower piece P2 to the upper piece P1, the temporary fastening jig 200 has at least the same effect as the temporary fastening jig 100 and can be easily released due to the presence of the knock mechanism. it can.
In the illustrated embodiment, two engaging members 213 are provided, but the number of engaging members 213 and the interval between them can be arbitrarily set.

<Third Embodiment>
Next, a temporary fixing jig 300 according to a third embodiment will be described with reference to FIG. In particular, a configuration of a temporary fastening jig 300 different from the temporary fastening jig 100 according to the first embodiment will be described. FIG. 6 is a perspective view for explaining the temporary fixing jig according to the third embodiment.
As shown in FIG. 6, the temporary fixing jig 300 includes a main body portion 310, a head portion 340, and an adjustment portion.

The main body 310 has a thread (for example, a male thread) 311 formed on the outer peripheral surface of the end opposite to the inclined portion 310a. The engaging member 313 of the main body 310 includes a portion 313a and a flat surface 313b that project obliquely. The engagement member 313 is moved back and forth with respect to the main body 310 in the temporary fixing jig 300 by a so-called thumb turn mechanism.
For example, the thumb turn mechanism includes a rotary operation unit 314 connected to the head 340, a connection unit (not shown) having one end connected to the operation unit 314 and the other end connected to the engagement member 313 in the main body 310. .)
For example, when the operation unit 314 is rotated in the direction of the arrow R, the rotational movement of the operation unit 314 is transmitted to the engagement member 313 via the connection unit, and the engagement member 313 is drawn into the main body 310. . That is, the connecting portion converts the rotational motion of the operation portion into the forward / backward motion of the engaging member 313. From this state, when the operation portion 314 is rotated in the reverse direction, the engaging member 313 projects outward from the main body portion 310. That is, unless the operation unit 314 is operated, the forward and backward movement of the engagement member 313 is not performed.

The head 340 is formed as a hollow cylindrical member, for example, and has a contact surface 340 a on the side facing the tip of the main body 310. A thread (for example, a female thread (not shown)) is formed on the inner peripheral surface of the hollow portion of the head 340. That is, in the temporary fastening jig 300, the adjustment portion is configured by the male thread 311 of the main body 310 and the female thread of the head 340.
When the lower piece P2 is temporarily fixed to the upper piece P1, the temporary fixing jig 300 has at least the same effect as the temporary fixing jig 100 and can be easily released due to the presence of the thumb turn mechanism. it can.
In the illustrated embodiment, two engaging members 313 are provided, but the number of engaging members 313 and the interval between them can be arbitrarily set.

DESCRIPTION OF SYMBOLS 1 Main body part 11 Storage part 11a Female thread (2nd thread)
13 Engagement member 4 Head 41 Abutting part 43 Shaft part 43a Male thread (first thread)
6 Adjustment part 100, 200, 300 Temporary fixing jig 270 Pressing member 314 Operation part d Interval P1 Upper piece P2 Lower piece P12, P22 Longitudinal flange P12a, P22a Hole

Claims (8)

A temporary fixing jig for temporarily fixing the lower piece to the upper piece among the pieces assembled together in the vertical direction,
A main body portion that is inserted through a hole formed in the flange of the pieces that are in contact with each other; and a head portion that is connected to the main body portion and contacts the flange of the upper piece;
The main body includes an engaging member that is movable forward and backward with respect to the outer peripheral surface of the main body, and that projects outward from the hole when advanced.
A temporary fixing jig comprising an adjusting portion for adjusting a distance between the head and the engaging member.   The adjusting portion includes a shaft portion of the head having a first thread formed on an outer peripheral surface, and a second screw thread that accommodates the shaft portion and engages the first thread on an inner peripheral surface. The temporary fixing jig according to claim 1, further comprising an accommodating portion of the main body portion.   The adjusting portion has a cylindrical shape and the head having a first thread formed on an inner peripheral surface, and the outer peripheral surface having a second thread engaged with the first thread. The temporary fixing jig according to claim 1, further comprising a main body portion.   The said main-body part is equipped with the urging mechanism which urges | biases so that it may engage with the said engaging member and the said engaging member may protrude toward the exterior from the inside of the said main-body part. The temporary fixing jig according to any one of 3 to 3.   The temporary fixing jig according to any one of claims 1 to 3, further comprising a pressing member that contacts the engaging member at one end thereof and retracts the engaging member.   A rotary operation unit for operating advancement and retraction of the engagement member, and one end connected to the operation unit, and the other end engaged with the engagement member to rotate the operation unit. The temporary fixing jig according to any one of claims 1 to 3, further comprising: a connecting portion that converts into a joint. In the temporary fixing method of temporarily fixing the lower piece to the upper piece using the temporary fixing jig according to any one of claims 1 to 6,
Bringing the lower piece closer to the upper piece and aligning the holes formed in each of the flanges;
Inserting the temporary fastening jig into the holes aligned with each other and engaging the engaging member with the flange of the lower piece;
A temporary fastening method comprising:   In a state where the engaging member is engaged with the flange of the lower piece, the upper piece and the lower piece are brought into contact with each other, and the adjusting portion is adjusted to adjust the head and the engaging member. The temporary fastening method according to claim 7, further comprising a step of narrowing the interval and sandwiching the flange between the head and the engagement member.

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