JPH11303138A - Method for coupling truck frame for construction machine and its coupling bolt device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance workability in coupling a center frame to a truck beam by use of a coupling bolt. SOLUTION: A beam mounting flange 7 of a center frame 2 is coupled to a truck beam 10 by use of a coupling bolt device 21 having a tension jig 23 attached to a bolt main body 22. With the bolt main body 22 placed on the lower surface plate 12 of the truck beam 10, the wire 25 of the tension jig 23 is passed through a bolt hole 7A in the beam mounting flange 7 from a bolt hole 11A in the truck beam 10, and the bolt main body 22 can be easily passed through the bolt holes 11A, 7A by simply pulling upward the wire 25 projecting from the bolt hole 7A. Thus, workability can be enhanced when the beam mounting flange 7 is coupled to the truck beam 10 by use of the bolt main body 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of connecting a truck frame for construction equipment constituting a lower traveling body such as a hydraulic shovel, a hydraulic crane, and the like, and a connecting bolt device therefor.

[0002]

2. Description of the Related Art In general, construction machines such as a hydraulic crane for transporting materials to a high place at a construction site and a hydraulic shovel for excavating earth and sand are used as crawlers for traveling on uneven terrain such as muddy land. It has an undercarriage of the formula.

A crawler-type undercarriage of this type according to the prior art will be described with reference to FIGS. 10 to 13. FIG.

In FIG. 10, reference numeral 1 denotes a track frame constituting a lower traveling body.
Are disposed on the center frame 2 so as to be spaced apart from the center frame 2 in the front and rear directions, and track beams 10, 10, which will be described later, have both left and right ends projecting from the center frame 2.
Disposed on the protruding end side of each track beam 10,
There are left and right side frames 17, 17 extending rearward.

Here, as shown in FIG. 12, the center frame 2 includes an upper plate 3 and a lower plate 4 opposed to the upper plate 3.
And a side plate 5 connecting the upper plate 3 and the lower plate 4 to form a substantially rectangular box. Further, a cylindrical round body 6 for supporting an upper revolving body (not shown) in a rotatable manner is provided at a central portion of the upper surface plate 3.

Are beam mounting flanges arranged at the four corners of the center frame 2, and each of the beam mounting flanges 7 has a base end on the center frame 2 side as shown in FIG.
The front end side which is fixed to the side plate 5 of the
It protrudes backward. A connection plate 8 connects between the beam mounting flange 7 and the upper surface plate 3 of the center frame 2, and reinforcing ribs 9, 9 are fixed between the beam mounting flange 7 and the connection plate 8. . And FIG.
As shown in FIG. 5, four bolt insertion holes 7A, 7B, 7C and 7D are formed in each beam mounting flange 7, respectively.

The reference numerals 10 and 10 are attached to the beam attachment flange 7 of the center frame 2 while being spaced apart in the front and rear directions.
The right and left ends are two track beams protruding from the center frame 2, and each track beam 10 includes an upper plate 11, a lower plate 12, and an upper plate 11 as shown in FIG.
A pair of side plates 13, 13 for connecting between the
It consists of Then, as shown in FIG. 13, bolt insertion holes 7 </ b> A formed in the beam mounting flange 7 of the center frame 2
Four bolt insertion holes 11A, 11B, 11C, 11D are formed at positions corresponding to 7B, 7C, 7D. Further, on the lower surface side of the upper surface plate 11, each of the bolt insertion holes 11A to
Four detent members 14, 14,... (Only two are shown) are fixed around 11D (see FIG. 12).

Then, as shown in FIG. 12, in a state where the track beam 10 is disposed below the beam mounting flange 7 provided on the center frame 2, the beam mounting flange is inserted through the bolt insertion holes 11A to 11D of the track beam 10. 7
Connecting bolts 15 toward the respective bolt insertion holes 7A to 7D.
By inserting nuts 16 into the connecting bolts 15 projecting upward from the bolt insertion holes 7A to 7D of the beam mounting flange 7, the track beam 10 is inserted into the beam mounting flange 7 of the center frame 2. It is configured to be connected.

Reference numerals 17 and 17 denote left and right side frames which are disposed on the protruding end side of the track beam 10 and extend forward and rearward. As shown in FIG. The track beam 10 is fixed to the track beam 10 by connecting bolts (not shown) or the like in a state where the projecting end of the track beam 10 is inserted into these square holes 17A, 17A. Things. A crawler belt 18 is wound between idler wheels and drive wheels (both not shown) disposed at both front and rear ends of each side frame 17, and these side frames 17 and idler wheels are provided. , Drive wheels, and crawler belt 18 form left and right crawler traveling bodies 19.

In the undercarriage according to the prior art described above, the undercarriage is usually connected to the center frame 2 and the track beam 10 so as to conform to weight restrictions, height restrictions and the like when transported to the work site. After being divided into the crawler traveling body 19 and individually conveyed to a work site by a trailer or the like, the center frame 2, the track beam 10, and the crawler traveling body 19 are assembled at the work site.

[0011]

By the way, when the center frame 2 transported to the work site in a divided state and each track beam 10 are to be connected, FIG. 11 and FIG.
As shown in FIG. 3, in a state where the track beam 10 is arranged below the beam mounting flange 7 provided on the center frame 2, each of the bolt insertion holes 11A to 11A of the track beam 10 is provided.
D to bolt mounting holes 7A to 7 of beam mounting flange 7
A connection operation is performed in which the connection bolt 15 is inserted toward D, and the nuts 16, 16 are tightened into the connection bolt 15 protruding from the bolt insertion holes 7A to 7D of the beam mounting flange 7.

Here, when performing the above-mentioned connecting operation, the bolt insertion holes 11B, 11C, 11D of the track beam 10 are used.
And bolt insertion holes 7B, 7C,
When the connecting bolt 15 is inserted through the connecting bolt 7D, a relatively large working space can be secured around the connecting bolt 15.

However, when the connecting bolt 15 is inserted into the bolt insertion hole 11A of the track beam 10 and the bolt insertion hole 7A of the beam mounting flange 7, as shown in FIG. 1
The connecting bolt 15 must be disposed in a narrow space A formed between the side bolt 13 and the side plate 13. For this reason, the worker supports the connecting bolt 15 with one hand in the above-mentioned narrow space A, while groping for the bolt insertion hole 11A of the track beam 10, and inserting the bolt into the beam mounting flange 7 from the bolt insertion hole 11A. The connecting bolt 15 must be inserted into the hole 7A. In this case, since a large bolt having a weight of, for example, about M45 is used as the connection bolt 15, the connection bolt 15 is inserted into the bolt insertion hole 7D of the beam mounting flange 7 from the bolt insertion hole 11A of the track beam 10. There is a problem that the workability is very poor and a heavy burden is imposed on the worker.

The present invention has been made in view of the above-described problems of the prior art, and has been improved in terms of workability when connecting a center frame and a track beam using connecting bolts. It is an object of the present invention to provide a method of connecting frames and a bolt device for connecting the frames.

[0015]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a construction comprising a center frame having a beam mounting portion, and a track beam connected to the beam mounting portion of the center frame by bolts. Applies to truck tracks for machinery.

In the method of connecting a truck frame for construction equipment according to the first aspect of the present invention, the connecting bolt is pulled from a beam mounting portion side of the center frame through a bolt insertion hole provided in the pulling track beam using a pulling jig. A bolt insertion step of inserting into a bolt insertion hole provided in a beam attachment portion of the center frame, and connecting a track beam to the beam attachment portion by tightening a nut into the connection bolt protruding from the bolt insertion hole of the beam attachment portion. Connecting step.

By adopting such a connecting method, when connecting the track beam to the beam mounting portion of the center frame, if the connecting bolt is pulled from the beam mounting portion side using a pulling jig, the connecting bolt is moved to the track. The beam can be easily inserted into the bolt insertion hole of the beam mounting portion through the bolt insertion hole of the beam.

According to a second aspect of the present invention, there is provided a method of connecting a truck frame for a construction machine, comprising: a bolt holding step of holding a connecting bolt upright toward a bolt insertion hole provided in a track beam; and pulling the connecting bolt. A bolt insertion step of pulling from a beam attachment portion side of the center frame using a jig and inserting the bolt into a bolt insertion hole provided in the beam attachment portion of the center frame through a bolt insertion hole provided in the track beam; Connecting a track beam to the beam mounting portion by tightening a nut to the connection bolt protruding from the bolt insertion hole of the portion.

By adopting such a connecting method, after the connecting bolt is held upright toward the bolt insertion hole provided in the track beam, the connecting bolt is pulled from the beam mounting portion side using a tension jig. When pulled, the connecting bolt can be easily inserted through the bolt insertion hole into the bolt insertion hole of the beam mounting portion without abutting around the bolt insertion hole of the track beam.

According to the third aspect of the present invention, a connecting bolt device for a truck frame for construction equipment is inserted into a bolt inserting hole provided in a track beam and a bolt inserting hole provided in a beam attaching portion of a center frame. A bolt body and a base end side are detachably attached to the bolt body, and a free end end is inserted from a bolt insertion hole of the track beam into a bolt insertion hole of a beam attachment portion prior to the bolt body. And a pulling jig.

With this configuration, the leading end side of the tension jig attached to the bolt body is inserted from the bolt insertion hole of the track beam into the bolt insertion hole of the beam attachment section prior to the bolt body, and Just pull on the tip of the pulling jig that protrudes from the bolt insertion hole of the mounting part,
The bolt main body can be inserted from the bolt insertion hole of the track beam into the bolt insertion hole of the beam attachment portion.

According to a fourth aspect of the present invention, the bolt body is
A shaft portion provided with a screw portion on the outer peripheral side, a head provided on a base end side of the shaft portion, and a screw hole provided on a distal end side of the shaft portion, a pulling jig, It is characterized by comprising a screw shaft screwed into a screw hole of the bolt body and a wire attached to the screw shaft.

With this configuration, the wire attached to the shaft end of the bolt body via the screw shaft is bent, and the wire is attached to the track beam from the bolt insertion hole of the track beam prior to the bolt body. It can be easily inserted into the bolt insertion hole of the part.

Further, the invention of claim 5 is characterized in that the track beam is provided with a bolt holder for holding the bolt body upright with the bolt body facing the bolt insertion hole.

With this configuration, the bolt body held by the bolt holder is kept upright toward the bolt insertion hole of the track beam, so that the pulling jig is moved from the bolt insertion hole of the track beam to the beam. After inserting the bolt into the bolt insertion hole of the mounting part and pulling the tension jig protruding from the bolt insertion hole of the beam mounting part, the bolt body can be easily inserted from the bolt insertion hole of the track beam to the bolt insertion hole of the beam mounting part. Can be inserted into

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a connecting bolt device used for a truck frame for construction equipment according to the present invention will be described below with reference to FIGS. This will be described in detail.

First, FIGS. 1 to 4 show a first embodiment according to the present invention.
Is shown. In the present embodiment,
The same reference numerals are given to the same components as those of the above-described conventional technology,
The description is omitted.

In FIG. 1, reference numeral 21 denotes a connecting bolt device according to the present embodiment. The connecting bolt device 21 is provided on a bolt insertion hole 7A formed in the beam mounting flange 7 of the center frame 2 and above the track beam 10. It comprises a bolt main body 22 inserted into a bolt insertion hole 11A drilled in the face plate 11, and a tension jig 23 described later attached to a tip end surface of the bolt main body 22.

As shown in FIG. 2, the bolt main body 22 includes a shaft portion 22A provided with a screw on the outer peripheral side, and a shaft portion 2A.
It is composed of a hexagonal head 22B provided on the base end side of 2A, and a screw hole 22C formed in the front end surface of the shaft portion 22A.

Reference numeral 23 denotes a pulling jig detachably provided on the tip end side of the bolt body 22.
The eye bolt 24 is screwed into the screw hole 22C of the bolt body 22 and has an annular mounting eye 24A on the distal end side as a screw shaft, and a flexible wire 25 connected to the mounting eye 24A of the eye bolt 24. A ring 26 is attached to the distal end side of the wire 25. Here, the outer diameter of the mounting eye 24A of the eye bolt 24 and the outer diameter of the ring 26 are formed to be smaller than the outer diameter of the shaft portion 22A of the bolt body 22.

The tension jig 23 is connected to the bolt body 2.
Prior to 2, the wire 25 is inserted from the bolt insertion hole 11A of the track beam 10 into the bolt insertion hole 7A of the beam mounting flange 7, and the ring 26 projecting upward from the bolt insertion hole 7A of the beam mounting flange 7 is pulled upward. Thus, the shaft portion 22A of the bolt main body 22 is inserted into the bolt insertion hole 7A of the beam mounting flange 7 via the bolt insertion hole 11A of the track beam 10.

Reference numeral 27 denotes a hook provided on the upper surface plate 3 of the center frame 2 in the vicinity of the beam mounting flange 7. The hook 27 is provided with a bolt insertion hole 11A of the track beam 10 and a bolt of the beam mounting flange 7. Insertion hole 7A
After the bolt body 22 has been inserted through this, the ring 26 of the tension jig 23 is locked.

The connecting bolt device 21 according to the present embodiment has the above-described configuration. Hereinafter, the center frame 2 and the track beam 1 using the connecting bolt device 21 will be described.
A method of connecting to 0 will be described.

First, as shown in FIG. 3, a bolt body having a tension jig 23 mounted in a narrow space A formed between the side plate 5 of the center frame 2 and the side plate 13 of the track beam 10. The bolt body 22 is inserted, and the bolt body 22 is once placed on the lower plate 12 of the track beam 10.
Then, while bending the wire 25 of the pulling jig 23, the ring 26 is inserted from the bolt insertion hole 11A of the track beam 10 into the bolt insertion hole 7A on the beam mounting flange 7 side, and the bolt insertion hole 7A of the beam mounting flange 7 is formed. The ring 26 is projected from the Subsequently, by pulling the ring 26 protruding from the bolt insertion hole 7A of the beam mounting flange 7 upward, the tip of the shaft portion 22A of the bolt body 22 is connected to the bolt insertion hole 11A of the track beam 10 as shown in FIG. Through the bolt mounting hole 7A on the beam mounting flange 7 side (bolt insertion step).

Then, the first nut 16 is connected to the ring 26
The shaft portion 22 of the bolt main body 22 that is inserted through the wire 25 from the side and protrudes from the bolt insertion hole 7A of the beam mounting flange 7
A, and the bolt body 22 is connected to the beam mounting flange 7.
Of the track beam 10 from the bolt insertion hole 7A and the track beam 10 from the bolt insertion hole 11A.

Next, with the head 22B of the bolt body 22 engaged with the rotation stopping member 14, the nut 16 is tightened to the shaft portion 22A of the bolt body 22 using a spanner (not shown) or the like. Thereafter, the second nut 16 is inserted into the wire 25 from the ring 26 side and tightened into the shaft portion 22A of the bolt main body 22, and the nuts 16 are loosened.
As shown in FIG. 1, the track beam 10 can be connected to the beam mounting flange 7 of the center frame 2 (connection step).

Then, by engaging the ring 26 attached to the tip end of the wire 25 of the pulling jig 23 with the hook 27 provided on the center frame 2, the pulling jig 23 can be organized in order.

Thus, when connecting the beam mounting flange 7 of the center frame 2 and the track beam 10 using the connecting bolt device 21 according to the present embodiment, the narrow space between the center frame 2 and the track beam 10 is required. With the bolt body 22 inserted into the space A once placed on the lower plate 12 of the track beam 10, the wire 25 of the pulling jig 23 is passed through the bolt insertion hole 11A of the track beam 10 prior to the bolt body 22. It is inserted into the bolt insertion hole 7A of the beam mounting flange 7, and the bolt insertion hole 7A
The bolt body 22 can be easily inserted into each of the bolt insertion holes 11A and 7A by pulling the distal end (ring 26) of the wire 25 protruding upward from the bolt insertion hole 11A.

Therefore, the workability when connecting the beam mounting flange 7 and the track beam 10 using the bolt body 22 in the narrow space A between the center frame 2 and the track beam 10 is greatly improved. Can be done. Further, for example, the bolt body 22 which is heavy
While holding the bolt, the bolt insertion hole 1 of the track beam 10
The operation of inserting the bolt main body 22 into the bolt insertion hole 11A or the like while groping the 1A can be eliminated, and the burden on the operator can be greatly reduced.

Next, FIGS. 5 to 7 show a second embodiment according to the present invention.
The present embodiment is characterized in that a bolt holder for holding a connecting bolt in an upright state is provided on a track beam. In the present embodiment,
The same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 5, reference numeral 31 denotes a connecting bolt device according to the present embodiment. The connecting bolt device 31 is substantially the same as the connecting bolt device 21 according to the first embodiment described above, and includes a bolt main body 22 and Although it has a pulling jig 23 attached to the tip end surface of the bolt main body 22, it is different in that the track beam 10 is provided with a bolt holder 32 described below for holding the bolt main body 22 in an upright state.

Reference numeral 32 denotes a bolt holder fixed on the lower surface plate 12 of the track beam 10.
As shown in FIGS. 5 and 6, four plate bodies 32A, 3
It is formed as a rectangular box from 2B, 32C, and 32D, and is disposed directly below the bolt insertion hole 11A.

Here, the bolt body 22 is attached to the plate 32A.
A vertical hole 33A corresponding to the shaft portion 22A of the
And a lateral hole 33B corresponding to the head 22B of the T-shape, a T-shaped notch 33 is formed, and the bolt body 22 is inserted upright into the bolt holder 32 through the notch 33, and each plate 32A , 32B between the head 2 of the bolt body 22
By engaging 2B, the bolt main body 22 is configured to be held upright toward the bolt insertion hole 11A.

The connecting bolt device 31 according to the present embodiment has the above-described configuration. Hereinafter, the center frame 2 and the track beam 1 using the connecting bolt device 31 will be described.
A method of connecting to 0 will be described.

First, as shown in FIG. 7, the bolt body 22 is inserted into the bolt holder 32 provided on the track beam 10 through the notch 33, and the head 2 of the bolt body 22 is inserted.
The bolt body 22 is held upright by engaging the bolt 2B between the plates 32A and 32B of the bolt holder 32. In this state, by disposing the track beam 10 below the beam mounting flange 7, the bolt body 22
Hold the upright state toward the bolt insertion hole 11A of the track beam 10 by the bolt holder 32 (bolt holding step).

Next, as shown in FIG. 8, a tension jig 23 is inserted into a narrow space A formed between the side plate 5 of the center frame 2 and the side plate 13 of the track beam 10, and the tension jig is pulled. Fix the eye bolt 24 of the jig 23 to the bolt body 22
At the tip of the shaft portion 22A, and bend the wire 25 of the pulling jig 23 to move the ring 26 to the track beam 10.
From the bolt insertion hole 11A into the bolt insertion hole 7A on the beam mounting flange 7 side. Then, by pulling the ring 26 projecting from the bolt insertion hole 7A of the beam mounting flange 7 upward, the tip of the shaft portion 22A of the bolt main body 22 passes through the bolt insertion hole 11A of the track beam 10 as shown in FIG. Then, it is inserted into the bolt insertion hole 7A on the beam mounting flange 7 side (bolt insertion step).

Thereafter, the nuts 16 and 16 are inserted into the wire 25 from the ring 26 side, and the shaft portion 22A of the bolt body 22 protruding from the bolt insertion hole 7A of the beam mounting flange 7.
, And these nuts 16 are screwed into the shaft portion 22A using a wrench (not shown) or the like, thereby, as shown in FIG. The track beam 10 can be connected to the beam mounting flange 7 (connection step).

Then, the ring 26 of the tension jig 23 is
By engaging the hook 27 provided on the center frame 2, the pulling jigs 23 can be arranged neatly.

Thus, the center frame 2 and the track beam 1 can be moved by using the connecting bolt device 31 according to the present embodiment.
In the case of connecting to the bolt 0, the bolt main body 22 held by the bolt holder 32 holds an upright state toward the bolt insertion hole 11A of the track beam 10. For this reason, in the bolt insertion step, the wire 2
5 is pulled upward, the shaft 22 of the bolt body 22
The tip A does not collide with the periphery of the bolt insertion hole 11A of the track beam 10 or the like, and the bolt main body 22 is moved from the bolt insertion hole 11A to the bolt insertion hole 7 of the beam mounting flange 7.
The work of inserting the center beam 2 into the center beam 2 and the track beam 10 can be further improved.

In the case of the connecting method for connecting the center frame 2 and the track beam 10 using the connecting bolt device 31 according to the second embodiment described above, the bolt holding step provided on the track beam 10 is performed in the bolt holding step. Although the case where only the bolt body 22 is held in the tool 32 has been described as an example, the present invention is not limited to this, and the bolt body 22 to which the pulling jig 23 is attached in advance is held in the bolt holder 32. It may be.

In each of the above-described embodiments, in the connecting step, the nut 1 is attached to the bolt body 22 using a spanner.
6, the present invention is not limited to this. For example, the nut 16 is tightened using a socket wrench with the tension jig 23 removed from the bolt body 22,
Thereafter, the tension jig 23 may be attached to the tip of the bolt body 22 again.

Further, in each of the above-described embodiments, the truck frame constituting the lower traveling body of the hydraulic crane has been described as an example. However, the present invention is not limited to this, and the present invention is not limited to this. Can also be applied to the track frame constituting the lower traveling body of the present invention.

[0053]

As described in detail above, according to the method for connecting truck frames for construction equipment according to the first aspect of the present invention,
When connecting the track beam to the beam mounting portion of the center frame, the connecting bolt is pulled from the beam mounting portion side using a tension jig, so that the connecting bolt is bolted to the beam mounting portion through the track beam bolt insertion hole. It can be easily inserted into the insertion hole. Thereby, for example, the workability when connecting the beam mounting portion and the track beam using the connection bolts in a narrow space formed between the center frame and the track beam can be greatly improved. Further, for example, while the worker holds the heavy bolt, it is not necessary to insert the bolt into the bolt insertion hole while groping for the bolt insertion hole of the track beam, thereby greatly reducing the burden on the operator. be able to.

According to the method of connecting a truck frame for construction equipment according to the second aspect of the present invention, the pulling jig is held while the connecting bolt is held upright toward the bolt insertion hole provided in the track beam. By pulling the connecting bolt from the beam mounting part side, it can be easily inserted into the bolt mounting hole of the beam mounting part through this bolt mounting hole without abutting the connecting bolt around the bolt insertion hole of the track beam. can do.

According to the connecting bolt device for a truck frame for construction equipment according to the third aspect of the present invention, a tension jig is attached to a bolt main body inserted into a bolt inserting hole of a track beam and a bolt inserting hole of a beam mounting portion. The front end of the tension jig attached to the bolt body is inserted through the bolt insertion hole of the track beam into the bolt insertion hole of the beam attachment section prior to the bolt body. By pulling the distal end side of the pulling jig protruding from the insertion hole, the bolt body can be reliably inserted from the bolt insertion hole of the track beam to the bolt insertion hole of the beam mounting portion.

According to the fourth aspect of the present invention, the tension jig of the connecting bolt device is constituted by the screw shaft screwed into the screw hole of the bolt body and the wire attached to the screw shaft. The operation of inserting a wire from the bolt insertion hole of the track beam into the bolt insertion hole of the beam mounting portion prior to the bolt body can be easily and reliably performed by bending the wire.

According to the fifth aspect of the present invention, the track beam is provided with the bolt holding member for holding the bolt body upright toward the bolt insertion hole, so that the beam is inserted from the bolt insertion hole of the track beam. When pulling the tension jig inserted into the bolt insertion hole of the mounting part, the connecting bolt can be prevented from abutting around the track beam bolt insertion hole, and the bolt insertion of the beam mounting part from the track beam bolt insertion hole can be prevented. The work of inserting the connecting bolt into the hole can be reliably performed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a connecting bolt device according to a first embodiment of the present invention, together with a track beam and a beam mounting flange of a center frame.

FIG. 2 is a front view showing the connecting bolt device in FIG. 1 in a state where a tension jig is removed from a bolt main body.

FIG. 3 is a longitudinal sectional view showing a state where a tension jig is inserted into a bolt insertion hole of a track beam or the like in the connection method according to the first embodiment.

FIG. 4 is a longitudinal sectional view showing a bolt insertion step in the connection method according to the first embodiment.

FIG. 5 is a longitudinal sectional view showing a connection bolt device according to a second embodiment of the present invention, together with a track beam and a beam mounting flange of a center frame.

6 is a cross-sectional view of the bolt holder shown in FIG. 5 as viewed from the direction of arrows VI-VI.

FIG. 7 is a longitudinal sectional view showing a bolt holding step in a connection method according to a second embodiment.

FIG. 8 is a longitudinal sectional view showing a state where a tension jig is inserted into a bolt insertion hole or the like of a track beam in the connection method according to the second embodiment.

FIG. 9 is a longitudinal sectional view showing a bolt insertion step in the connection method according to the second embodiment.

FIG. 10 is a plan view showing a track frame of a conventional hydraulic crane.

FIG. 11 is an enlarged plan view showing a portion a in FIG. 10 in an enlarged manner.

FIG. 12 is an enlarged vertical sectional view of a beam mounting flange and a track beam as viewed from the direction of arrows XII-XII in FIG. 11;

FIG. 13 is an enlarged plan view of the same position as FIG. 11 showing a state where a beam mounting flange and a track beam are divided.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Track frame 2 Center frame 7 Beam mounting flange (beam mounting part) 7A, 7B, 7C, 7D Bolt insertion hole 10 Track beam 11A, 11B, 11C, 11D Bolt insertion hole 21, 31 Connecting bolt device 22 Bolt body 22A Shaft 22B Head 22C Screw hole 23 Pulling jig 24 Eye bolt (screw shaft) 25 Wire 32 Bolt holder

Claims (5)

[Claims] 1. A method for connecting a track frame for construction machinery, comprising: a center frame having a beam mounting portion; and a track beam connected to the beam mounting portion of the center frame by a connecting bolt. A bolt insertion step of pulling the beam from the beam mounting portion side of the center frame using a tool and inserting the bolt into a bolt insertion hole provided in the beam mounting portion of the center frame through a bolt insertion hole provided in the track beam; Connecting a track beam to the beam mounting portion by tightening a nut to the connection bolt protruding from the bolt insertion hole of the section. 2. A method for connecting a track frame for construction equipment, comprising: a center frame having a beam mounting portion; and a track beam connected to the beam mounting portion of the center frame by a connecting bolt. A bolt holding step of holding the bolt upright toward the bolt insertion hole provided in the beam, and pulling the connection bolt from the beam mounting portion side of the center frame using a pulling jig to remove the bolt insertion hole provided in the track beam. A bolt inserting step of inserting the bolt into the bolt mounting hole provided in the beam mounting portion of the center frame, and tightening a nut into the connecting bolt protruding from the bolt mounting hole of the beam mounting portion, thereby allowing a track beam to be inserted into the beam mounting portion. And a connecting step of connecting truck frames for a construction machine. 3. A connecting bolt device for a truck frame for construction equipment, comprising: a center frame having a beam mounting portion; and a track beam connected to the beam mounting portion of the center frame by a connecting bolt. The bolt body inserted into the bolt insertion hole provided in the bolt body and the bolt insertion hole provided in the beam mounting portion of the center frame, and the distal end side which is detachably attached to the base end side of the bolt main body and becomes a free end. A connecting frame device for a truck frame for a construction machine, comprising: a pulling jig inserted from a bolt insertion hole of the track beam into a bolt insertion hole of a beam mounting portion prior to the bolt body. 4. The bolt body includes a shaft portion provided with a screw on an outer peripheral side, a head portion provided on a base end side of the shaft portion,
A screw hole provided at a tip end side of the shaft portion, and the pulling jig includes a screw shaft screwed into the screw hole of the bolt body, and a wire attached to the screw shaft. The connecting bolt device for a truck frame for construction equipment according to claim 3. 5. The connection bolt device for a truck frame for a construction machine according to claim 3, wherein the track beam is provided with a bolt holder for holding the bolt body upright toward the bolt insertion hole.