JPH0329921B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a connection structure for frame units.

Conventionally, when assembling a bridge, members are interconnected by welding or high-strength bolts. Therefore, assembly work takes time, which is a problem especially when constructing an emergency bridge at a construction site.

SUMMARY OF THE INVENTION An object of the present invention is to provide a frame unit connection structure that allows for efficient construction of structures on site.

Another object of the present invention is to provide a connecting structure for frame units that has improved strength by preventing stress concentration from occurring.

The present invention provides a pair of horizontal members 3, 4 made of steel that are arranged in parallel with an interval in the vertical direction, and a pair of horizontal members 3, 4 at both ends in the axial direction of the pair of horizontal members 3, 4. A frame-like frame unit 1 is constituted by a pair of vertical members 5 and 6 that are connected vertically, and at an end of the frame-like frame unit 1, each pair of connections facing each other with an interval in the thickness direction is provided. The connecting members of the adjacent frame units 1a are fixed, and each connecting member of the adjacent frame unit 1a is overlapped in the thickness direction. A pair of insert members 42, 43 each having a tapered shape axially inward are inserted into the through holes, and a bolt having a male thread at least at one end is inserted into the inner periphery of the insert members 42, 43. One of the inner members 42 and 43 is prevented from moving outward in the axial direction by stoppers 47 and 48 provided at one end of the bolt, and the other inner member 4
Stoppers 48 and 47 are screwed onto the male screws axially outward of 3 and 42, and the other inner insertion member 4
3 and 42 to the one inner member 42 and 43 side to interconnect each adjacent frame unit 1 and 1a, and the shaft portion 49 of the bolt is provided with threads 50 at intervals in the circumferential direction. This is a connecting structure of frame units characterized by the following.

FIG. 1 is a side view of a bridge that is a Pratt truss according to an embodiment of the present invention, and FIG. 2 is a plan view thereof. This bridge is constructed by combining frame units 1 according to the present invention, and passage plates 2 of this bridge.
You can pass over it. In FIG. 2, this passage plate 2 is shown in a simplified manner with the left half omitted.

FIG. 3 is a side view of the frame unit 1, and the fourth
The figure is a plan view thereof, FIG. 5 is a bottom view thereof, and FIG. 6 is a front view thereof. Frame unit 1
are horizontal members 3 and 4 made of H-shaped steel extending in the horizontal direction.
and vertical members 5 and 6 made of channel steel or the like and extending in the vertical direction. The transverse members 3, 4 and the longitudinal members 5, 6 are connected at their ends by gussets 7-10.

At one end on the left side in FIG. 4 of the horizontal member 3,
Filler plates 11 and 12 are fixed to the flanges. These filler plates 11, 12
A pair of connecting members 13 and 14 that protrude outward in the axial direction of the horizontal member 3 are fixed to. Integral connecting members 15 and 16 are fixed to the other end of the horizontal member 3 on the right side in FIG. 4 at its flange.

Connecting members 17 and 18 are also fixed to the horizontal member 4 at one end on the left in FIG. 5, and a filler plate 1 is fixed on the end on the right in FIG.
A pair of connecting members 21 and 22 are fixed via 9 and 20. In FIG. 6, connecting members 15, 16, 21,
22 and filler plates 19, 20 are omitted for simplicity of illustration. Gussets 9, 10 are fixed to the ends of the flanges of the transverse members 3, 4, and these gussets 9, 10 are fixed to the flanges of the longitudinal member 6 by high-strength bolts or the like.

FIG. 7 is a front view showing a state in which adjacent frame units 1 and 1a are connected, and FIG. 8 is a longitudinal sectional view thereof. Frame unit 1 of frame unit 1a
Components corresponding to are indicated with a subscript a. An I-shaped member 33 is fixed to the vertical member 5 by brackets 31 and 32. The passage plate 2 is fixed onto this I-shaped member 33. A guardrail 34 is fixed on the I-shaped member 33. Frame unit 1,1
A is also provided on the left side of FIG. 8, and has a symmetrical configuration.

FIG. 9 shows connecting members 13, 14 and connecting members 15a, 1.
6a is a cross-sectional view showing a state in which they are connected. The connecting members 13, 14, 15a, 16a have through holes 37, 38, 39 whose axes lie on a common straight line 36.
a, 40a are formed. The insertion member 42 is inserted gently into the through holes 37 and 39a, and the through holes 38 and 40
The insertion member 43 is gently inserted into the hole a. Part 4
A bolt 41 having a male thread formed over its entire length is inserted into the inner peripheral surface of the bolts 2 and 43. Insertion member 43
The inner diameter of the inner circumferential surface 44 of the bolt 41 is very slightly larger than the outer diameter of the thread of the bolt 41. The insertion member 43 has an axially inner part 45 and an axially outer part 4.
6. The axially inner portion 45 has a right cylindrical shape. The axially outer portion 46 is tapered inwardly in the axial direction, and has a truncated conical outer shape. The through holes 38, 40a are formed in a tapered conical shape toward the axially inward side of the bolt 41 so as to be in tight surface contact with the outer peripheral surface of the axially outer portion 46. Another interpolation member 4
The configuration related to 2 is also similar. bolt 41
A nut 47 is screwed into one end of the shaft, and a nut 48 is screwed into the other end. By tightening the nuts 47, 48 inward in the axial direction of the bolt 41, the inner members 42, 43 open through the holes 37, 39a;
38, 40a, and the insert member 4
The outer peripheral surfaces of 2, 43 are through holes 37, 39a; 38, 4
It comes into tight surface contact with the inner circumferential surface of 0a, eliminating rattling. This prevents stress concentration from occurring and firmly fixes the frames 1 and 1a.

FIG. 9A is an axis-perpendicular cross-sectional view of the bolt 41. This bolt 41 includes a shaft portion 49 and threads 50 formed on the outer periphery thereof over a range of less than 180 degrees in the circumferential direction, that is, at intervals in the circumferential direction. By using the bolt 41 having such a configuration, the nuts 47 and 48 can be firmly tightened even if mud or the like adheres to the outer circumferential surface of the bolt 41, and unnecessary mud or the like can be removed. mountain 5
0 through the gap, such mud does not require large tightening torques.

FIG. 10 is an enlarged sectional view of the vicinity of the connecting member 14. Also referring to FIG. 3, the horizontal members 3 and 4
Gussets 52 and 53 are fixed at the center of the housing and extend in opposite directions. The gussets 52, 53 are secured by another longitudinal member 54. A rod-shaped member 55 is connected between the gussets 7 and 53. Further, a rod-shaped member 56 is connected between the gussets 10 and 52. The members 55, 56 extend on diagonals of two adjacent squares formed within the rectangular frame formed by the horizontal members 3, 4 and the vertical members 5, 6.

FIG. 11 is a sectional view taken from section line A-A in FIG. 10, and FIG. 12 is a sectional view taken from section line B-A in FIG.
13 is a sectional view taken from the line CC in FIG. 11. FIG. A support piece 57 is fixed between the gussets 7. A reinforcing rib 58 extending toward the connecting member 14 is fixed to this support piece 57 . A guide hole 60 is formed in the support piece 57 and opens diagonally to the upper right in FIG. The member 55 is a threaded rod, and a nut 62 is screwed into the end of the rod through a washer 61. Upper end 6 of support piece 57
3 is nearly horizontal and is inclined upward, so that the washer 61 can be guided along the guide hole 60 by the supporting piece 5.
7 surfaces. By the member 55 reaching the end 62 of the guide hole 60,
The member 55 can be located on a diagonal of each of said squares. Residual gussets 10, 52, 5
3 is similarly configured.

Only a tensile force acts on the member 55,
Therefore, it is advantageous because it can be relatively thin, requires a small amount of material, and can withstand a strong tensile force.

In another embodiment of the present invention, the bolt 41 is formed with a male thread over its entire length, but in another embodiment of the present invention, a nut is provided to prevent the inner member 42 from slipping out upward in FIG. 47
A stopper having the same function as that shown in FIG. Good too.

As described above, according to the present invention, it is only necessary to transport each frame-shaped frame unit to the site and connect the frame units, so that the transportation work does not take up much space and work efficiency is improved. Further, since the inserting member is formed in a tapered shape, it is easy to insert the inserting member into the through hole of the connecting member of the frame unit during assembly, and quick assembly is possible.

In particular, according to the present invention, since the through hole and the inserted member are formed in a tapered shape toward the inner side in the axial direction, the outer peripheral surface of the inserted member and the inner peripheral surface of the through hole can be connected by tightening the stopper. Therefore, between the outer circumferential surface of the insert member and the inner circumferential surface of the through hole,
There is no pause. As a result, there is no risk of misalignment between the interconnecting members of the adjacent frame units 1 and 1a, and this avoidance of misalignment between the interconnecting members means that the bridge, especially the truss bridge, is deflected. This is important in reducing the amount of damage as much as possible. Furthermore, in the present invention, since threads are provided on the outer circumferential surface of the bolt at intervals in the circumferential direction, even if mud or the like undesirably adheres to the bolt, the inner part of the stopper screwed onto the bolt can be removed. It can be discharged between the circumferential surface and the circumferentially intermediate portion of the thread, that is, the outer circumferential surface of the portion of the shaft where no thread is formed, and between the internal thread and the external thread, It won't bite the mud. Therefore, when tightening the stopper, an undesirably large torque is not required, and the stopper can be tightened smoothly. By using such bolts, it is also possible to speed up the bridge assembly work. Furthermore, no matter which of the two axial ends of the bolt is tightened the stopper, the connecting members facing each other at intervals in the thickness direction can be equally tightened, and therefore, during assembly work, There is no need for the operator to judge the structural function and select the stopper to be tightened before performing the tightening work.
In this respect as well, the work can be made easier, faster, and smoother.

[Brief explanation of drawings]

Fig. 1 is a side view of a bridge which is a Pratt truss according to an embodiment of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a side view of the frame unit 1, Fig. 4 is a plan view thereof, and Fig. 5 is a plan view thereof. Its bottom view, Figure 6 is its front view,
FIG. 7 is a front view showing the state in which the frame units 1 and 1a are connected, FIG. 8 is a longitudinal sectional view thereof, and FIG. 9 is a state in which the connecting members 13 and 14 and the connecting members 15a and 16a are connected. The cross-sectional view, Figure 9A, shows the bolt 41.
10 is an enlarged sectional view of the vicinity of the connecting member 14, and FIG. 11 is a cross-sectional view taken along the section line A-A in FIG. 10.
12 is a sectional view taken along the section line BB in FIG. 11, and FIG. 13 is a sectional view taken along the section line CC in FIG. 11. 1... Frame unit, 2... Passage board, 3, 4...
...Horizontal member, 5, 6... Vertical member, 7, 8, 9, 1
0, 52, 53...gusset, 13, 14, 1
5, 16, 17, 18, 21, 22... connecting material,
37, 38, 39, 40... Through hole, 41... Bolt, 42, 43... Inserted member, 47, 48... Nut, 55, 56... Member.

Claims (1)

[Scope of Claims] 1. A pair of horizontal members 3, 4 made of steel arranged in parallel with an interval above and below, and the pair of horizontal members 3, 4.
A frame-like frame unit 1 is constructed including a pair of vertical members 5 and 6 which are connected perpendicularly to each of the horizontal members 3 and 4 at both ends in the axial direction. , each pair of connecting members facing each other at intervals in the thickness direction is fixed, each connecting member of the adjacent frame unit 1a is overlapped in the thickness direction, and the overlapping connecting members have a common axis on a straight line. A tapered through hole is formed inwardly in the axial direction, and a pair of tapered insert members 42 and 43 are inserted into the through holes, respectively, and at least one end thereof has a tapered through hole. Bolts having male threads are inserted through the inner circumferential surfaces of the inner members 42 and 43, and one of the inner members 42 and 43 is axially pushed outward by stoppers 47 and 48 provided at one end of the bolt. Displacement is prevented and the other insert member 4
Stoppers 48 and 47 are screwed onto the male screws axially outward of 3 and 42, and the other inner insertion member 4
3 and 42 to the one inner member 42 and 43 side to interconnect each adjacent frame unit 1 and 1a, and the shaft portion 49 of the bolt is provided with threads 50 at intervals in the circumferential direction. A connecting structure of a frame unit, characterized in that: