JPH10220437A - Positioning and fixing method for members using knock-bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need of reaming a bolt hole. SOLUTION: A knock-bolt 3 and a cylindrical sleeve 4 having an inner diameter slightly larger than the outer diameter of the knock-bolt 3 are prepared, and the first member A is formed to have a bolt hole 1 for driving the end 34 side of the knock-bolt 3. In addition, the second member B is formed to have a sleeve hole 2 for inserting the sleeve 4. The sleeve hole 2 has such internal surface 20 as coming in tight contact with the external surface 40 of the sleeve 4 with the prescribed accuracy. In this case, the first member A and the second member B are first positioned for each other and, then, the knock-bolt 3 is driven into the bolt hole 1 of the first member A. At the same time, the sleeve 4 is inserted in the sleeve hole 2 of the second member B in such a state as capped to the knock-bolt 3. Thereafter, the sleeve 4 and the knock-bolt 3 so assembled are jointed to each other with weld W. Finally, a nut 5 is screwed and tightened to the threaded part 32 of the knock-bolt 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for positioning and fixing two members to each other by using knock bolts in a case where centering work is performed in assembly after disassembly and inspection of a water turbine generator and a water turbine, for example. About.

[0002]

2. Description of the Related Art Conventionally, for example, in a periodic inspection of a water turbine generator and a water turbine, when performing centering work at the time of assembling disassembled equipment, as a method of positioning and fixing two members to each other, FIG. The method using the knock bolt 3 as shown in FIG.

In FIG. 3, a plate-shaped first member A and a second member B ', both of which are plate-shaped, are overlaid on each other. Also, the first
The member A and the second member B ′ are respectively formed with a bolt hole (knock bolt driving hole) 1 into which the knock bolt 3 is driven and a bolt hole 6 through which the knock bolt 3 is passed.
A screw portion 32 is formed on one end 30 of the knock bolt 3.

When two members A and B 'are positioned and fixed to each other, first, the first member A and the second member B' are positioned. Next, the knocking bolt 3 is driven into the bolt hole 1 of the first member A.
In order to drive the knock bolt 3 again, it is necessary to slightly increase the diameter of the bolt hole 1 and then drive the knock bolt 3 having a larger diameter. In addition, in the case where a deviation occurs between the bolt hole 1 of the first member A and the bolt hole 6 of the second member B 'during positioning, it is necessary to enlarge and correct the two bolt holes 1 and 6 so that they coincide with each other. There is also.

Therefore, before driving the knock bolt 3 again, first, the bolt hole 1 of the first member A and the second member B '
Are enlarged and corrected until the diameter of the bolt hole 6 becomes slightly smaller than the outer diameter of the new knock bolt 3. next,
Only the bolt hole 6 of the second member B 'is
The diameter is slightly increased until the diameter corresponds to the diameter.

Next, the other end 3 of the knock bolt 3 is inserted into the bolt hole 1 of the first member A through the bolt hole 6 of the second member B '.
Four sides are driven. Then, the two nuts 7, 8 are sequentially tightened to the screw portion 32 of the knock bolt 3 that has been driven, and the positioning and fixing of the first member A and the second member B 'are completed.

[0007]

The above-described method of positioning and fixing between members by using the knock bolt has the following problems. That is, as described above, when slightly increasing the diameter of the bolt hole 6 of the second member B 'to a diameter corresponding to the diameter of the knock bolt 3, the knock bolt 3
(This leads to the accuracy of positioning between the first member A and the second member B ') between the first member A and the second member B'. .

However, since the reaming is generally performed using a portable electric drilling machine, the operation of machining many bolt holes 6 requires a great deal of labor and time. In addition, since it is necessary to secure a space for such a processing operation, there are restrictions on device design.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a method for positioning and fixing between members by using a knock bolt which can omit the reaming of a bolt hole.

[0010]

According to the present invention, there is provided a method of positioning and fixing a first member and a second member to each other by using a knock bolt having a threaded portion on one end side. A cylindrical sleeve having an inner diameter slightly larger than the dimension is prepared, a bolt hole for driving the other end of the knock bolt is formed in the first member, and the first member is formed with a bolt hole. Forming a sleeve hole corresponding to a bolt hole and having an inner peripheral surface that is in close contact with the outer peripheral surface of the sleeve, the sleeve hole being for inserting the sleeve, and the first member and the second member And positioning the other end of the knock bolt into the bolt hole of the first member through the sleeve hole of the second member that has been positioned. An assembling step of inserting the knock bolt and the sleeve into the sleeve hole of the second member so as to cover the knock bolt and incorporating the knock bolt and the sleeve; and a welding step of welding between the incorporated sleeve and the knock bolt. And a tightening step of tightening a nut to a screw portion of the knock bolt.

According to the present invention, even if a displacement occurs between the bolt hole of the first member and the sleeve hole of the second member in the positioning step, the sleeve covered with the knock bolt in the assembling step does not Since the inner diameter is slightly larger than the outer diameter of the bolt, it is possible to cope with the above-mentioned displacement by this difference in size.

Further, since the sleeve hole of the second member has an inner peripheral surface which is in close contact with the outer peripheral surface of the sleeve, the sleeve and the knock bolt are welded in a welding step to integrate the two with each other. Thus, the accuracy of the close contact between the knock bolt and the sleeve hole of the second member is ensured, and the accuracy of the positioning between the first member and the second member is ensured. Therefore, according to the present invention, it is not necessary to perform reaming after the positioning step as in the related art.

[0013]

Next, an embodiment of the present invention will be described with reference to the drawings. 1 and 2 are views showing an embodiment of a method for positioning and fixing between members by using a knock bolt according to the present invention. In the embodiment of the present invention shown in FIGS. 1 and 2, the same components as those of the conventional example shown in FIG.

In FIG. 1 and FIG. 2, a first member A and a second member B, both of which are plate-like, are superimposed on each other. Further, a knock bolt 3 having a threaded portion 32 formed on one end 30 side, and a cylindrical sleeve 4 having an inner diameter slightly larger than the outer diameter of the knock bolt 3 are prepared.

In the first member A, a bolt hole (knock bolt driving hole) 1 for driving the other end 34 of the knock bolt 3 is formed, and in the second member B, the first member A is formed. A sleeve hole 2 for inserting the sleeve 4 is formed corresponding to the bolt hole 1 (see FIG. 2A).

The sleeve hole 2 has an inner peripheral surface 20 which comes into close contact with the outer peripheral surface 40 of the sleeve 4 with a predetermined accuracy (see FIG. 1 or FIG. 2B). At the bottom of the sleeve hole 2 (on the side of the first member A), a step portion 22 that engages with the bottom surface of the sleeve 4 is formed over the entire circumference.

Hereinafter, a method of positioning and fixing the two members A and B using the knock bolt 3 will be described in the order of steps. First, as shown in FIG. 2A, a first member A and a second member B
(Positioning step).

Next, the bolt hole 1 of the first member A is enlarged and corrected until the diameter thereof becomes slightly smaller than the outer diameter of the new knock bolt 3. In order to drive the knock bolt 3 again into the bolt hole 1 after the knock bolt 3 has been pulled out, the diameter of the bolt hole 1 is slightly enlarged, and then the knock bolt 3 having a larger diameter is driven. It is necessary. The work of enlarging and correcting the bolt hole 1 can be performed prior to the positioning step.

Next, as shown in FIG. 2B, the first member A is inserted through the sleeve hole 2 of the second member B positioned.
The other end 34 of the knock bolt 3 is driven into the bolt hole 1, and the sleeve 4 is inserted into the sleeve hole 2 of the second member B so as to cover the knock bolt 3. Incorporation (incorporation step)

Next, as shown in FIG. 1, welding W is performed between the assembled sleeve 4 and the knock bolt 3 (welding step). In this case, the upper portion of the sleeve 4 on the inner peripheral surface 42 side,
It is preferable to perform low-temperature welding W between the corresponding outer peripheral surface of the knock bolt 3 and the entire periphery thereof. And
After this welding process, the nut 5 is tightened to the screw portion 32 of the knock bolt 3, and the positioning and fixing of the first member A and the second member B are completed (tightening process). A recess 50 is formed on the bottom side of the nut 5 to avoid interference with the sleeve 4.

Next, the operation of the present embodiment having such a configuration will be described. According to the present embodiment, in the positioning step, the bolt hole 1 of the first member A and the second member B
Even if there is a difference between the outer diameter of the knock bolt 3 and the outer diameter of the knock bolt 3, the sleeve 4 covered with the knock bolt 3 in the assembling process has an inner diameter slightly larger than the outer diameter of the knock bolt 3. That is, the gap described above can be handled by the gap between the two 3 and 4).

Further, since the sleeve hole 2 of the second member B has the inner peripheral surface 20 which comes into close contact with the outer peripheral surface 40 of the sleeve 4 with a predetermined accuracy, the space between the sleeve 4 and the knock bolt 3 is welded in the welding step. By integrating the two members 3 and 4, the close contact accuracy between the knock bolt 3 and the sleeve hole 2 of the second member B via the sleeve 4 is ensured, and thus the first member A and the second member B And the positioning accuracy between them is ensured. Therefore, according to the present embodiment, it is not necessary to perform the reaming after the positioning step as in the related art.

[0023]

As described above, according to the present invention,
It is not necessary to perform reaming after the positioning step as in the related art. For this reason, the labor and time required for the work of positioning and fixing the members can be significantly reduced, and restrictions on equipment design for securing a working space for reaming can be avoided.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a method for positioning and fixing between members using a knock bolt according to the present invention, showing a state after completion of a full stroke.

FIG. 2 is a view corresponding to FIG. 1, showing an intermediate step of the fixing method shown in FIG. 1;

FIG. 3 is a longitudinal sectional view showing an example of a conventional method for positioning and fixing between members using a knock bolt, and is a view showing a state after completion of a full stroke.

[Explanation of symbols]

 A first member B, B 'second member W welded portion 1 bolt hole (knock bolt driving hole) of first member 2 sleeve hole 3 knock bolt 4 sleeve 5, 7, 8 nut 6 bolt hole of second member ( Knock hole) 20 Inner peripheral surface of sleeve hole 30 One end of knock bolt 32 Screw part of knock bolt 34 Other end of knock bolt 40 Outer peripheral surface of sleeve 42 Inner peripheral surface of sleeve

Claims (1)

[Claims] 1. A method for positioning and fixing a first member and a second member to each other using a knock bolt having a threaded portion on one end side, wherein an inner diameter slightly larger than an outer diameter of the knock bolt is previously determined. Prepare a cylindrical sleeve having, a bolt hole for driving the other end side of the knock bolt in the first member, and the sleeve corresponding to the bolt hole of the first member in the second member. A positioning step of positioning the first member and the second member while forming a sleeve hole that is a sleeve hole for insertion and has an inner peripheral surface that is in close contact with the outer peripheral surface of the sleeve; The other end of the knock bolt is driven into the bolt hole of the first member through the positioned sleeve hole of the second member, and the sleeve is put on the knock bolt. The assembling step of inserting the knock bolt and the sleeve into the sleeve hole of the second member as described above, a welding step of welding between the incorporated sleeve and the knock bolt, A method of positioning and fixing between members using a knock bolt, comprising: a tightening step of tightening a nut to a screw portion.