JP6998815B2 - Insert mounting jig and sleeve, insert mounting method - Google Patents

Description

The present invention relates to a jig, a sleeve, and a mounting method for mounting the insert in a formwork when the insert for fixing the fixed member is embedded in a concrete structure.

As is well known, a ceramic insert is embedded in a concrete structure, for example, a concrete wall / ceiling of a tunnel or a box culvert, and a desired fixed member is fastened to the insert.

This insert is pre-installed inside the formwork prior to concrete placement. As a jig for attaching this insert to the mold, a fixing bolt of Non-Patent Document 1 is known.

According to this fixing bolt, the shaft portion is screwed into the female screw hole of the insert from the outside of the formwork to attach the insert to the formwork in a cantilever manner, and then concrete is poured into the formwork.

After the concrete is hardened, fixing bolts are screwed out from the female screw holes of the insert, and the insert is embedded in the concrete. A fixed member such as a support bolt for scaffolding or a hanging bolt on the ceiling is fastened to the female screw hole of the insert embedded here.

"Fine Ceramics Concrete Anchor MEIDEN Meiden Ceramic Insert (Pre-installed Anchor) Meiden Ceramic Anchor (Post-installed Anchor)", [online], [Search on March 15, 2018], Internet {HYPERLINK "URL: http: / /www.m-cera.com/pages/common/pdf/zal-2875.pdf%20 ", URL: http://www.m-cera.com/pages/common/pdf/zal-2875.pdf}

Japanese Patent Application Laid-Open No. 2003-27597 JP-A-2005-297316

According to Non-Patent Document 1, when the insert is attached to the formwork, it is necessary to turn the fixing bolt in one direction with a tool or the like and fasten the shaft portion of the fixing bolt to the female screw hole of the insert.

Further, when removing the mold after the concrete is hardened, it is necessary to turn the fixing bolt in the other direction with a tool or the like to release the fastening. However, since a large number of inserts are embedded in the concrete structure, each of the above operations must be performed for each insert. Therefore, the labor of the insert burying work increases, which may affect the construction period and construction cost of the concrete structure.

The present invention has been made to solve such a conventional problem, and an object of the present invention is to improve the work efficiency of the insert burying work and to reduce the work labor.

(1) One aspect of the present invention is a jig for attaching the insert to the formwork when the insert for fixing the fixed member is embedded in the concrete structure.
One end where a male screw portion to be fastened to the female screw hole of the insert is formed, and
The other end, which is rotatably inserted into a tubular sleeve mounted in the formwork, is provided.
The outer periphery of the other end portion includes a guide portion that guides the convex portion formed on the inner circumference of the sleeve along the axial direction at the time of insertion, and a groove portion formed substantially in the circumferential direction from the guide portion. Prepare,
When the other end portion is rotated in one direction after the insertion, the convex portion enters the groove portion and the other end portion is fixed to the inner circumference of the sleeve.

(2) Another aspect of the present invention is a sleeve that is fixed to the formwork when the insert is attached to the formwork by the mounting jig.
A tubular sleeve body and the convex portion provided on the inner circumference of the sleeve body are provided.
The convex portion is characterized in that when the other end portion inserted into the sleeve body is rotated in one direction, the convex portion enters the groove portion and the other end portion is fixed to the inner circumference of the sleeve body. And.

(3) Still another aspect of the present invention is a method of attaching the insert to the formwork using the mounting jig when the insert for fixing the fixed member is embedded in the concrete structure.
The first step of fastening the male screw portion of the mounting jig to the female screw hole of the insert and mounting the mounting jig to the insert.
A second step of rotatably inserting the other end of the mounting jig into the sleeve and guiding the convex portion along the axial direction of the other end by a guide portion.
A third step of rotating the mounting jig together with the insert in one direction, engaging the convex portion with the concave portion of the groove portion, and fixing the other end portion to the inner peripheral surface of the sleeve.
It is characterized by having a fourth step of removing the formwork after the concrete cast in the formwork is hardened and breaking the constricted portion between both ends.

(3) Yet another aspect of the present invention is characterized in that the one end portion after the fourth step remains in the female screw hole of the insert.

According to the present invention, the work efficiency of the insert burying work is improved, and the work labor can be reduced.

The perspective view of the insert mounting jig which concerns on embodiment of this invention. Same plan view FIG. 1A is a cross-sectional view taken along the line AA of FIG. The perspective view which shows the state of completion of the 1st process of the insert mounting method by the mounting jig. The perspective view which shows the start state of the 2nd process. The partial perspective view which shows the state after the completion of the 2nd process. (A) is a partial perspective view showing the start state of the third step, (b) is a sectional view of (a), (c) is a partial perspective view showing the completion state of the third step, and (d) is (d). c) sectional view. The perspective view which shows the state of the 4th process. (A) is a state diagram showing a process of inserting a flat-blade screwdriver and rotating it counterclockwise when removing the tip of the mounting jig from the sleeve, and (b) is a state diagram showing the process of lifting the flat-blade screwdriver after the process of (a) to lift the tip of the mounting jig. A state diagram showing the process of pulling out. (A) is a perspective view showing a state in which the tip of the mounting jig is pushed in when the tip of the mounting jig is taken out from the sleeve, and (b) is a perspective view showing the completion of pushing in (a).

Hereinafter, the insert mounting jig, the sleeve, and the insert mounting method according to the embodiment of the present invention will be described. Here, the insert is embedded in a concrete structure such as a pier of a bridge, and is used to fix a fixed member such as a support bolt for scaffolding to the concrete structure.

<< Configuration example >>
A configuration example will be described with reference to FIGS. 1 to 4. 1 in FIGS. 1 to 3 indicates the mounting jig. When the ceramic insert 2 is embedded in the concrete structure, the mounting jig 1 attaches the insert 4 to the formwork 3 via a sleeve 4 (see FIG. 4) mounted in the formwork 9 of the formwork 3. It is attached detachably.

The sleeve 4 includes a sleeve body 10 formed in a circular tubular shape and pins 10a provided at 180-degree positions in the circumferential direction of the sleeve body 10, and a through hole 10b is formed in the sleeve body 10. ing.

The pin 10a is provided so as to penetrate from the outer peripheral side to the inner peripheral side of the sleeve main body 10 and protrudes as a convex portion on the inner peripheral side of the sleeve main body 10 (see FIGS. 5 to 9). Further, a male screw portion 10c to be fastened to the mold hole (female screw hole) 9 is formed on the outer periphery of the sleeve body 10 on one end side.

Specifically, as shown in FIGS. 1 to 3, the mounting jig 1 is formed in a single shape, and the one end portion 5 screwed into the insert 2 (see FIG. 4) and the inside of the sleeve body 10 The other end portion 6 fixed to the periphery and the constricted portion 11 between the two ends 5 and 6 are provided, and the cavity portions 5a and 6a shown in FIG. 3 are formed in the axial direction in both end portions 5 and 6. .. Here, a male screw portion 8 to be fastened to the female screw hole 7 (see FIG. 4) of the insert 2 is formed on the outer periphery of the one end portion 5, and an annular flange 12 is formed on the constricted portion 11 side.

On the other hand, the other end 6 is rotatably inserted into the through hole 10b of the sleeve body 10. As shown in FIGS. 1 and 2, the outer circumference of the other end portion 6 is a pair of matings formed between the end surface 6b on the insertion direction side (opposite direction side of the one end portion 5) and the substantially central portion of the outer circumference. The surface 14, the groove portion 15 formed in the substantially circumferential direction from the constricted portion 11 side of each mating surface 14, the drawn groove 16 formed from the back side of the groove portion 15 to the constricted portion 11, and the vicinity of the constricted portion 11. It has a pair of formed slit grooves 17.

Each of the mating surfaces 14 has a flat shape in which the thickness of the other end portion 6 is thinned, and is formed at symmetrical positions on the outer periphery of the other end portion 6. Here, each sliding surface 14 functions as a guide portion that guides each convex portion 10a of the sleeve body 10 along the axial direction at the time of the insertion.

Further, as shown in FIG. 2, the groove portion 15 has a groove bottom continuously formed from the sliding surface 14, and the groove wall 15a on the insertion direction side is inclined toward one end portion 5 side in this sense. It can be said that the groove portion 15 has a spiral shape. A step 15b is formed on the groove wall 15a, and a concave portion 15c that can engage with the convex portion 10a of the sleeve body 10 is formed on the back side of the step 15b (at a position of about 100 degrees in the circumferential direction from the sliding surface 14). It is formed.

Here, a punching groove 16 is formed at a position facing the concave portion 15c, that is, between the concave portion 15c and the constricted portion 11 along the axial direction. Further, each slit groove 17 is formed at a position of 180 degrees in the circumferential direction like the sliding surface 14. Each of the slit grooves 17 is opened to a size that allows the tip of a flat-blade screwdriver 20 (see FIG. 10) to be inserted.

≪How to bury the insert≫
The method of burying the insert 2 will be described with reference to FIGS. 4 to 8. The insert 2 is embedded in a concrete structure through the first steps to the fourth steps of FIGS. 4 to 8. Hereinafter, each step will be described.

(1) First Step The first step will be described with reference to FIG. Here, the male screw portion 8 of the one end portion 5 of the mounting jig 1 is screwed into the female screw hole 7 of the insert 2. As a result, the male screw portion 8 is fastened to the female screw hole 7, and one end portion 5 of the mounting jig 1 is screwed into the insert 2.

(2) Second Step The second step will be described with reference to FIGS. 5 and 6. Here, it is assumed that the male screw portion 10c of the sleeve main body 10 is fastened to the mold hole 9 of the mold 3 in advance, and the sleeve 4 is even attached to the mold 3.

Then, as shown in FIG. 5, the tip surface 6b of the other end 6 of the mounting jig 1 is opposed to the through hole 10b of the sleeve body 10. In this state, the mounting jig 1 is rotated to align each mating surface 14 with the position of each convex portion 10a of the sleeve body 10.

After that, as shown by the arrow P, the other end 6 of the mounting jig 1 is rotatably inserted into the through hole 10b of the sleeve body 10. At this time, each convex portion 10a of the sleeve main body 10 is guided to the inlet 15d of the groove portion 15 along each mating surface 14 as shown in FIG.

(3) Third step The third step will be described with reference to FIG. 7. Here, the insert 2 is rotated clockwise (about 100 degrees) together with the mounting jig 1 in the state after the completion of the second step. As a result, the other end of the mounting jig 1 rotates in the direction of the arrow Q in FIGS. 7 (a) and 7 (b).

At this time, each convex portion 10a is guided by the groove wall 15a of the groove portion 15 as shown by an arrow R, and then, as shown in FIGS. Get in. As a result, the convex portion 10a and each concave portion 15c are engaged, the other end 6 of the mounting jig 1 is locked (fixed) to the inner circumference of the sleeve body 10, and the insert 2 is attached to the mold 3. Is completed.

Further, since the groove wall 15a is inclined, the mounting jig 1 is further pushed in the arrow P direction when rotating in the arrow Q direction. As a result, the flange 12 comes into close contact with the open end 10d of the sleeve body 10, and the gap between the two 12 and 10d disappears.

After the attachment of the insert 2 to the formwork 3 is completed, the concrete C is placed inside the formwork 3. In this case, since the two 12 and 10d are in close contact with each other, it is possible to prevent the concrete slag (concrete in the liquid state) from invading between the two 12 and 10. In this respect, it is possible to prevent troubles associated with the intrusion of the concrete glue, that is, loss of the female screw hole 7 and the cavity 5a.

(4) Fourth step The fourth step will be described with reference to FIG. Here, after the concrete C placed inside the formwork 3 is hardened, the mold is removed, that is, the work of removing the formwork 3 is performed. At this time, since the constricted portion 11 of the mounting jig 1 is broken, both ends 5 and 6 are separated from each other with the flange 12 as a boundary, and the formwork 3 is made of concrete C with the other end 6 fixed to the sleeve 4. Is removed from.

Further, after the mold is removed, the one end portion 5 of the mounting jig 1 remains in the insert 2 and serves as a cap for the female screw hole 7 until the fixed member is fastened. As a result, the female screw hole 7 is protected to prevent dust and the like from entering, and in this respect, deterioration of the female screw hole 7 is suppressed.

According to such a mounting jig 1 and a sleeve 4, the insert 2 can be mounted on the mold 3 only by rotating the insert 2 clockwise by about 100 degrees after the completion of the second step. Therefore, unlike the conventional method, it is not necessary to turn the fixing bolt in one direction with a tool or the like to fasten the fixing bolt to the insert 2, and the insert 2 can be easily attached to the mold with one touch.

Further, since the constricted portion 11 is broken during the demolding work, it is not necessary to release the fixing bolts at the time of demolding as in the conventional case. As a result, it is possible to improve the work efficiency of the insert burying work and reduce the work labor. Further, the following effects can be obtained with respect to Patent Documents 1 and 2. The reference numerals used in the explanations of Patent Documents 1 and 2 indicate the reference numerals described in the respective Patent Publications.

(A) According to the holding insert of Patent Document 1, the stopper piece 5a of the stopper 5 inserted into the mold hole Ka serves as a stopper to prevent the insert body 1 from coming off, and the insert body 1 is attached to the mold K. However, the stopper piece 5a of Patent Document 1 has a weak assembling property to the mold K, and may wobble and come out of the mold hole Ka.

On the other hand, the other end 6 of the mounting jig 1 is not merely a stopper, but is firmly fixed to the inner circumference of the sleeve 4 by engaging each convex portion 10a with the concave portion 15c. As a result, unlike Patent Document 1, there is no possibility of wobbling, and in this respect, the effect that the insert 2 can be reliably attached to the mold 3 can be obtained.

(B) According to the insert holder 3 of Patent Document 2, the holding portion 8 is inserted through the mounting member 4 in the formwork P. The locking portion 13 of the holding portion 8 is locked to the mounting member 4, and the insert 2 is mounted on the formwork P.

However, although the shape of the locking portion 13 is restored and locked when it passes through the mounting member 4, it is difficult to bring the two 13 and 4 into close contact with each other, so that the locking portion 13 passes through the gap between the two 13 and 4. , There is a risk that the concrete slag will invade the female screw hole 2a of the insert 2.

On the other hand, the mounting jig 1 has a configuration in which the convex portion 10a and the concave portion 15c are engaged with each other, and if the insert 2 is further rotated clockwise, the inside of the sleeve 4 is pushed in the arrow P direction. The space between 12 and the open end 10d of the sleeve body 10 are in close contact with each other. In this respect, the effect of preventing the intrusion of concrete slag can also be obtained.

<< How to remove the other end 6 >>
As described above, after the fourth step, the other end 6 of the mounting jig 1 remains in the sleeve 4. Hereinafter, two methods (fifth step) for removing the other end 6 in the sleeve 4 will be described.

(1) A method of pulling out the other end 6 from the sleeve 4 will be described with reference to FIG. First, as shown in FIG. 9A, the tip of a flat-blade screwdriver 20 is inserted into one slit groove 17 of the other end 6 and rotated in the direction of arrow T to rotate the sleeve 4 in the convex portion 10a and the other end. The engagement with the concave portion 15c of 6 is released.

Next, as shown in FIG. 9B, the flat-blade screwdriver 20 may be lifted and the other end 6 may be pulled out. As a result, the other end 6 can be easily removed from the sleeve 4 without affecting the work efficiency and labor.

(2) A method of pushing and removing the other end 6 from the sleeve 4 will be described with reference to FIG. Here, as shown in FIG. 10A, the other end portion 6 remaining in the sleeve 4 may be pushed in the direction of arrow S1 from the end surface 6c on the breaking side by a tool such as a flat-blade screwdriver 20.

At this time, since the convex portion 10a is pulled out via the drawing groove 16, the other end portion 6 in the sleeve 4 falls out of the mold 3 as shown by the arrow S2 in FIG. 10B. Therefore, the other end portion 6 can be easily removed by simply pushing the end surface 6b of the other end portion 6 remaining in the sleeve 4 with a tool, which contributes to improvement of work efficiency and reduction of work labor. can do.

The present invention is not limited to the above embodiment, and can be modified and implemented within the scope described in each claim. For example, the slit groove 17 may be abolished and the other end 6 may be removed by the method of FIG. 10 after the fourth step.

Further, even if the step 15b and the concave portion 15c of the groove portion 15 are abolished, the convex portion 10a of the sleeve 4 is applied to the groove wall 15a, and the other end portion 6 of the mounting jig 1 is attached to the inner circumference of the sleeve 4. good.

1 ... Insert mounting jig 2 ... Insert 3 ... Formwork 4 ... Sleeve 5 ... One end 6 ... End 6b ... End face 7 ... Female screw hole 8 ... Male thread 10 ... Sleeve body 10a ... Pin (convex part)
11 ... Constricted part 14 ... Mating surface (guide part)
15 ... Groove portion 15a ... Groove wall 15b ... Step 15c ... Concave portion 16 ... Drained groove 17 ... Slit groove

Claims (11)

A jig that attaches the insert to the formwork when the insert for fixing the member to be fixed is embedded in the concrete structure.
One end where a male screw portion to be fastened to the female screw hole of the insert is formed, and
The other end, which is rotatably inserted into a tubular sleeve mounted in the formwork, is provided.
The outer periphery of the other end portion includes a guide portion that guides the convex portion formed on the inner circumference of the sleeve along the axial direction at the time of insertion, and a groove portion formed substantially in the circumferential direction from the guide portion. Prepare,
For mounting an insert, wherein the convex portion enters the groove portion and the other end portion is fixed to the inner circumference of the sleeve when the other end portion is rotated in one direction after the insertion. jig. The jig for mounting an insert according to claim 1, wherein the groove portion is formed in a spiral shape that is inclined toward one end portion side. In the groove portion, a step is formed on the groove wall on the insertion direction side.
A concave portion that engages with the convex portion is provided at the back of the step.
The jig for mounting an insert according to claim 1 or 2, wherein the other end portion is fixed to the inner surface of the sleeve by engaging the convex portion with the concave portion. The jig for mounting an insert according to claim 3 , wherein a constricted portion is provided between the one end portion and the other end portion. The jig for mounting an insert according to claim 4, wherein the outer periphery of the other end portion is provided with a punching groove between the concave portion and the constricted portion. The jig for mounting an insert according to claim 4 or 5, wherein a slit groove into which the tip of a tool can be inserted is formed on the outer periphery of the other end portion on the constricted portion side. A sleeve that is fixed to the formwork when the insert is attached to the formwork by the mounting jig according to any one of claims 1 to 6.
A tubular sleeve body and the convex portion provided on the inner circumference of the sleeve body are provided.
The convex portion is characterized in that when the other end portion inserted into the sleeve body is rotated in one direction, the convex portion enters the groove portion and the other end portion is fixed to the inner circumference of the sleeve body. The sleeve of the insert mounting jig. When the insert for fixing the member to be fixed is embedded in a concrete structure, the insert is attached to the formwork by using the attachment jig according to claim 4.
The first step of fastening the male screw portion of the mounting jig to the female screw hole of the insert and mounting the mounting jig to the insert.
A second step of rotatably inserting the other end of the mounting jig into the sleeve and guiding the convex portion along the axial direction of the other end by a guide portion.
A third step of rotating the mounting jig together with the insert in one direction, engaging the convex portion with the concave portion, and fixing the other end portion to the inner peripheral surface of the sleeve.
The fourth step of removing the formwork after the concrete placed in the formwork has hardened and breaking the constricted portion, and
A method of mounting an insert, characterized in that it has. The other end remaining in the sleeve after the fourth step is
The method for mounting an insert according to claim 8, further comprising a fifth step of pushing in from the fractured side and discharging the other end portion from the inside of the sleeve. After the fourth step, the tip of the tool is inserted into the slit groove at the other end remaining in the sleeve and rotated in the other direction to release the engagement between the concave portion and the convex portion.
The method for attaching an insert according to claim 8, further comprising a fifth step of lifting the tool and pulling out the other end portion after the release. The method for mounting an insert according to any one of claims 8 to 10, wherein the one end portion after the fourth step remains in the female screw hole of the insert.

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