JP2002242114A - Modular joint for road bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a modular joint for a road bridge reducing the generation of noises by relaxing an impact and vibrations at a time when a car collides with a middle beam and an end beam in the case of the passage of the car or the like. SOLUTION: Chamfered sections 14 are formed within a range of R5-R20 respectively in the longitudinal direction of an edge section 11b on the reverse side to the car traveling direction of the upper flange 11 of the middle beam 10 constituting the rectangular load supporting member of the modular joint for the road bridge and in the longitudinal direction of an edge section 8a on the reverse side to the car traveling direction of the head section 8 of the end beam 7 installed on the car traveling direction side of the middle beam 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road bridge modular joint for automatically adjusting the expansion and contraction of a road bridge.
More specifically, the present invention relates to a structure for reducing noise generated when a vehicle or the like passes.

[0002]

2. Description of the Related Art In general, a road bridge is provided with an expansion joint between its girder clearances in order to allow a vehicle or the like to travel without any hindrance against displacement of the bridge due to temperature change, concrete creep and drying shrinkage, load and the like. A device is provided. In a road bridge provided with such an expansion joint device, when a vehicle or the like passes over the expansion joint device, noise is generated due to the impact at that time, and the noise passes through the upper and lower girder gaps of the expansion joint device. Therefore, there is a demand for prevention of such noise in order to propagate to the outside, and many proposals have conventionally been made to respond to this.

FIG. 6 is a perspective view of a modular joint for a road bridge (hereinafter referred to as a modular joint), which is one of the conventional expansion joint devices for a road bridge. In the figure,
1 is a girder gap 2 formed between bridge girders 20a and 20b.
1 is a modular joint provided orthogonally to the bridge axis, and boxes 2a, 2b,
2b and a plurality of pairs of first and second bridge axial load supporting members 5a and 5b (hereinafter referred to as support beams) arranged side by side between the boxes 2a and 2b with the bearing 3 interposed therebetween in the direction orthogonal to the girder clearance 21. ), And a long right-angle load support member 6 (hereinafter, referred to as a beam) installed on the first and second support beams 5a, 5b at right angles to the bridge axis.

In this beam 6, end beams 7a and 7b are end beams (hereinafter may be simply referred to as 7) formed of a steel material and having a length substantially equal to the width of the bridge and having a substantially L-shaped cross section. As shown in FIG. 7, the lower horizontal piece is joined to the upper support plates 4a and 4b of the boxes 2a and 2b by welding, respectively, and the head 8 formed in the longitudinal direction of the upper part of the vertical piece has A mounting groove 9 for a seal member, which will be described later, which opens toward the inside, is provided. The edge 8a of the head 8 of the end beam 7 on the side of the middle beam 10 is formed substantially at a right angle, and the edge 8b on the opposite side is chamfered obliquely.

[0005] Reference numerals 10a and 10b denote middle beams (hereinafter may be simply referred to as 10) which are made of a steel material and have substantially the same length as the end beams 7a and 7b and have a substantially H-shaped cross section. In the longitudinal direction on both sides of the upper flange 11, there are provided mounting grooves 13 for a seal member, which will be described later, and open outward. The upper flange 1
Both upper edge portions 11a, 11b of 1 are formed substantially at right angles. Of these middle beams 10a and 10b, the lower flange 12 of the middle beam 10a is on the first support beam 5a, the lower flange 12 of the middle beam 10b is on the second support beam 5b, and the space between the two is almost the same. It is fixed so as to be at equal intervals.

Reference numerals 15a, 15b and 15c denote end beams 7
And a substantially V-shaped seal member having elasticity such as rubber (hereinafter, may be simply referred to as 15), and one free end of the seal member 15a is provided at one end of the end beam 7a. The other free end is fitted into one of the mounting grooves 13 of the middle beam 10a in a watertight manner, and is mounted in the mounting groove 9 in a watertight manner.
Is mounted between the end beam 7b and the middle beam 10b, and the seal member 15c is mounted between the middle beams 10a and 10b in a watertight manner.

In the modular joint 1 configured as described above, the end beams 7a, 7b
And the distance between the middle beams 10a and 10b, the distance between the middle beams 10a and 10b, and the distance between the middle beams 10a and 10b.
The intervals between b are almost equal. Now, when the girders 20a, 20b extend in the bridge axis direction due to, for example, a rise in temperature, the support beams 5a, 5b slide relative to the bearings 3 with respect to the girders 20a, 20b, and the girders 20a, 20b
As 0b moves in the direction to narrow the girder clearance 21, the seal member 15 is deformed to absorb this movement, and at the time of maximum movement, the end beams 7a, 7b and the middle beams 10a,
The interval of 10b and the interval of the middle beams 10a and 10b are almost zero.

On the other hand, the digits 20a, 2
When 0b contracts in the bridge axis direction, the support beams 5a, 5
b slides relatively between the bearings 3 with respect to the girders 20a and 20b. As the girders 20a and 20b move in the direction of expanding the girder play 21, the seal member 15 is deformed to absorb this movement. However, at the time of the maximum movement, the interval between the end beams 7a, 7b and the middle beams 10a, 10b is maximized, and the interval between the middle beams 10a, 10b is substantially equal to the above-mentioned interval.

[0009]

The conventional modular joint 1 as described above can reliably cope with a wide range of expansion and contraction movement of a girder or the like, and furthermore, obtain excellent watertightness and dust resistance. Can be. However, when a vehicle or the like passes over the modular joint 1, there is a problem that noise generated by the impact propagates from the girder gap 21 to the outside. For this reason, conventionally, the noise transmitted to the outside has been reduced by covering the lower surface of the modular joint 1 with a cover such as an iron plate or rubber, or by interposing a foam material or a sealing member in the girder play 21. But it was not always enough.

The following can be considered as causes of noise generated by a vehicle or the like passing over the modular joint 1. (1) A collision sound or an impact sound generated when the wheel collides with the edge portions 11a and 11b of the upper flange 11 of the middle beam 10 and the edge portion 8a of the head of the end beam 7. (2) Vibration noise generated when the wheels vibrate by colliding with the edge portions 11a, 11b and 8a. (3) Impact when the wheel gets over a gap (groove) formed between the middle beams 10 or between the end beam 7 and the middle beam 10, a pumping sound of the wheels getting compressed or released by entraining air.

The conventional soundproofing method does not take measures against the sound source itself that generates noise as described above, but rather confine the noise to prevent its propagation to the outside. However, since the upper surface of the road bridge is open, the conventional soundproofing method has limitations.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is intended to reduce the noise and shock caused by the collision of a wheel with a middle beam or an end beam when a vehicle or the like passes. It is an object of the present invention to provide a modular joint for a road bridge, which reduces the occurrence of occurrence.

[0013]

SUMMARY OF THE INVENTION The present invention relates to a modular joint for a road bridge having a bridge axial load support member and a right angle load support member and installed on a girder clearance. The longitudinal direction of the edge of the upper flange of the middle beam opposite to the vehicle running direction,
And a chamfered portion in the range of R5 to R20 in the longitudinal direction of the edge portion of the head of the end beam provided on the side of the middle beam in the vehicle running direction, opposite to the vehicle running direction.

Further, an elastic sealing material is mounted between the middle beams and between the middle beams and the end beams.

[0015]

[First Embodiment] FIG. 1 is a front view of a middle beam and an end beam of a modular joint according to a first embodiment of the present invention. In the present embodiment, the longitudinal direction of the edge portion (11b in this example) of the upper flange 11 on the side opposite to the vehicle traveling direction of the upper beam 11 of the middle beam 10 (the side on which the wheels of the traveling vehicle abut) and the middle beam In the longitudinal direction of the edge portion 8a of the head 8 opposite to the vehicle traveling direction of the end beam 7 provided on the vehicle traveling direction side of 10, a chamfered portion 14 having a radius R is provided.

Here, the size of the chamfered portion 14 varies depending on the scale of the modular joint 1 and the like, but as a result of various experiments, the radius R is generally in the range of 5 mm to 20 mm (hereinafter, referred to as the radius R).
R5 to R20) were found to be desirable. If the chamfered portion 14 is less than R5, the wheel collides with the edge 11b (or 11a) of the middle beam 10 and the edge 8a of the end beam 7, thereby generating a collision sound, an impact sound, or a vibration sound due to the vibration of the wheel itself. And is not preferred. Further, when the chamfered portion 14 exceeds R20, not only the strength of the middle beam 10 and the end beam 7 becomes insufficient, but also the unevenness becomes severe due to the step formed in the modular joint 1, so that not only the running property is poor, but also ,
A collision sound, an impact sound, or a vibration sound due to the vibration of the wheel itself is generated. Furthermore, since the gap between the modular joint 1 and the wheel is increased, the sound that the air entrains the air and compresses or releases the air is generated. Therefore, the size of the chamfered portion 14 is
It has been found that the range of R5 to R20 is desirable.

In this embodiment, as described above, the edge 11b (or 11a) of the upper flange 11 of the middle beam 10 on the opposite side to the vehicle running direction, and the middle beam 1
In the longitudinal direction of the edge 8a of the head 8 of the end beam 7 installed on the side of the vehicle running direction 0, which is opposite to the vehicle running direction, the chamfered portions 14 in the range of R5 to R20 are provided.
When a vehicle or the like passes over the modular joint 1, impacts and vibrations caused by collision of the wheels with the middle beam 10 and the end beam 7 are reduced, and noise can be reduced. In a snowy area, an accident occurred in which the middle beam 10 and the end beam 7 were bent due to hooking of a snow plow of a snowplow. However, by providing the chamfered portion 14, such an accident was prevented. Can be prevented.

[Second Embodiment] FIG. 2 is a front view of a modular joint middle beam according to a second embodiment of the present invention. This embodiment is different from the first embodiment in that, instead of the chamfered portion in the first embodiment, the upper flange 11 of the middle beam 10 and the edge portion 11 of the head 8 of the end beam 7 on the opposite side to the vehicle running direction.
As shown in FIG. 2, an oblique chamfered portion 14a cut obliquely in a substantially triangular cross section is provided in the longitudinal direction of b, 8a.

The size of the oblique chamfered portion 14a depends on the size of the modular joint 1 and the like, but for the same reason as in the first embodiment, the height H5 mm to 10 mm and the width W1.
It is desirable to form in the range of 0 mm to 20 mm. In the present embodiment, substantially the same effects as in the first embodiment can be obtained.

Third Embodiment FIG. 3 is a front view of a middle beam and an end beam of a modular joint according to a third embodiment of the present invention. This embodiment is similar to the first embodiment.
Or 2, between the head 8 of the end beam 7 and the upper flange 11 of the middle beam 10 and the middle beam 10
An elastic sealing material 16 is mounted and closed in a gap formed above a sealing member 15 mounted between the upper flanges 11 of the above.

The sealing member 16 includes the middle beam 10.
Silicon-based sealing materials that are excellent in the ability to follow movements such as are preferred, but have modified silicone-based sealing, polysulfide-based sealing, polyeritane-based sealing, butyl-based sealing, acrylic-based sealing, etc., and have durability and elasticity. Any material that can close the gap can be used. According to the present embodiment, noise can be further reduced as compared with the first and second embodiments.

[Test Example] The inventor of the present invention conducted a test using a test facility as schematically shown in FIG. 4 to confirm the noise reduction effect of the present invention. In FIG.
(A) is a side view of the test facility, and (b) is a plan view thereof. In the drawing, 10c and 10d are test members corresponding to the middle beam 10 of the modular joint 1 installed on the road surface 31, and as shown in FIG.
mm, width W: 129 mm, length L: 600 mm, two steel plates were installed with a gap G: 40 mm apart, and at the position shown in FIG.
A first noise meter 30a and a second noise meter 30b are installed. As the sound level meters 30a and 30b, a normal sound level meter with a frequency analyzer (NA-29) manufactured by Rion Co., Ltd. was used.

As shown in FIG. 5A, one of the test members 10c and 10d has the same length as that of the first embodiment in the longitudinal direction of the edge portion 11b opposite to the vehicle running direction. In the directions R5, R10 and R2 respectively
FIG. 5 (b) shows three types having the 0 chamfered portion 14.
As in the case of the third embodiment, the sealing member 16 (Shin-Etsu Chemical Co., Ltd., silicone sealant 40) is mounted between the test members 10c and 10d to close the gap G. Was used for the test. In addition, 1
Reference numeral 7 denotes a polystyrene foam interposed below the sealing member 16 in place of the sealing member 15. As a comparative example,
As in the prior art, the upper flange 11 of the middle beam 10
The test was performed using the test members 10c and 10d without the chamfered portions 14 corresponding to those having no chamfered portions 14 at the edge portions.

In the test, as shown in FIG. 4, a passenger car (coroller) 32 was run on the road surface 31 at a speed of 80 km / h in the direction of the arrow to pass over the test members 10c and 10d, and this was repeated several times. . The test results are shown in Table 1 (the numerical values in Table 1 are the average values of the results of several tests).

[0025]

[Table 1]

As is clear from Table 1, in the first embodiment, when the chamfered portion 14 is R10, the effect of reducing noise is the largest, and is improved by 3.2 dB as compared with the prior art. In addition, R20 was followed by R5 and R5 was the lowest, but it was confirmed that the noise reduction effect was improved in each case as compared with the related art. Further, when the sealing material 16 according to the third embodiment was used, the noise reduction effect was further improved, and the difference from the related art was 4.2 dB.

[0027]

According to the first aspect of the present invention, the longitudinal direction of the edge of the upper flange of the middle beam constituting the right-angle load supporting member of the modular joint for a road bridge, which is opposite to the vehicle running direction, and In the longitudinal direction of the edge portion opposite to the vehicle traveling direction of the head of the end beam provided in the vehicle traveling direction of the middle beam, a chamfered portion is provided in the range of R5 to R20, so that the vehicle etc. on the modular joint When passing, the impact caused by the collision of the wheel with the middle beam is reduced, and noise can be reduced.

Further, the invention according to claim 2 of the present invention provides:
According to the first aspect of the present invention, since a sealing material having elasticity is mounted between the middle beam and the gap formed between the middle beam and the end beam, it is possible to further reduce noise when the vehicle passes. it can.

[Brief description of the drawings]

FIG. 1 is a front view of a middle beam and an end beam according to Embodiment 1 of the present invention.

FIG. 2 is a front view of a middle beam according to a second embodiment of the present invention.

FIG. 3 is a front view of a middle beam, an end beam, and the like according to a third embodiment of the present invention.

FIG. 4 is an explanatory diagram of a test facility of the present invention.

FIG. 5 is an explanatory diagram of a test member used for a test.

FIG. 6 is a perspective view for explaining a conventional modular joint.

FIG. 7 is a front view of the middle beam and the end beam of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Modular joint 5a, 5b Axial load support member 6 Right angle load support member 7 End beam 8 Head 8a, 11a, 11b Edge part 10 Middle beam 11 Flange 14 Chamfer part 15 Seal member 16 Sealing material 20a, 20b Girder 21 digit Yuma

Claims (2)

[Claims] 1. A modular joint for a road bridge having a bridge axial load support member and a right angle load support member and installed on a girder clearance, wherein an upper flange of a middle beam constituting the right angle direction load support member is provided. R5 to R20 in the longitudinal direction of the edge portion opposite to the vehicle traveling direction of the vehicle and in the longitudinal direction of the edge portion of the head of the end beam provided on the side of the middle beam opposite to the vehicle traveling direction. A modular joint for road bridges, characterized in that a chamfer is provided in the range of. 2. The modular joint for a road bridge according to claim 1, wherein an elastic sealing material is mounted between the middle beams and between the middle beams and the end beams.