JPH10147904A - Mounting structure of expansion joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mounting structure of an expansion joint which is easily replaceable. SOLUTION: A mounting structure of an expansion joint is comprised of an expansion joint 1 which is spanned between both open cut parts for disposing a joint and bolted with anchor bolts 2 embeded respectively under bottom surfaces of each open cut part for disposing a joint of bridge beams facing mutually and a mounting hole formed on both lateral edge parts of the expansion joint 1. Anchor bolts 2a for replacement are embeded between an each anchor bolt 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expansion joint mounting structure.

[0002]

2. Description of the Related Art Expressways and the like are constructed by connecting a number of bridge girders. However, since the bridge girders expand and contract according to the ambient temperature, expansion joints are interposed between the bridge girders.

As shown in FIG. 6, the expansion joint has a fixed pitch (normally 300 mm) at each end of opposing bridge girders H, H.
Attachment is made by anchor bolts 8 (or 9) buried at a pitch. However, there are two conventional attachment structures shown below.

First, as shown in FIG. 7, the anchor bolt 8 has an overhang 80 and a male screw 81 at the upper end, and the expansion joint 1 is held between the male screw 81 and a nut 82. There is.

When the expansion joint 1 is mounted using this mounting structure, the nut 82 may be screwed into the expansion joint 1 after externally inserting the mounting hole 10 of the expansion joint 1 using the male screw portion 81 of the anchor bolt 8 as a guide. Installation work can be performed relatively easily.

However, when the expansion joint 1 is replaced, the male screw 81 and the nut 82 are usually rusted and fixed, so that the male screw 81 of the anchor bolt 8 must be broken when the joint is removed. However, for this reason, the anchor bolt buried portion had to be removed and a new anchor bolt 8 had to be provided.

Next, as shown in FIG. 8, it is assumed that the anchor bolt 9 has a mounting body 90 having a female screw portion 91 at the upper end, and a headed bolt 92 is screwed into the female screw portion 91. In some cases, the peripheral portion of the mounting hole 10 of the expansion joint 1 is sandwiched between the mounting body 90 and the head bolt 92.

In this mounting structure, a head bolt 92 is screwed into the female screw portion 91 with the mounting hole 10 of the expansion joint 1 and the female screw portion 91 of the mounting body 90 aligned with each other. Can be installed.

However, also in this mounting structure, when the female screw portion 91 and the headed bolt 92 are rusted and fixed, a new anchor bolt 8 is provided as in the above-described structure. Or head bolt 9
After the head of No. 2 was cut off, it was necessary to perform an operation requiring skill, such as accurately forming a one-size large female screw portion 91 in the female screw portion 91 by tapping.

[0010] Therefore, in this type of industry, an expansion joint mounting structure that does not require a troublesome operation of replacing an anchor bolt or a work requiring skill when exchanging an expansion joint, that is, an expansion joint capable of easily exchanging an expansion joint. Development of a joint mounting structure is desired.

[0011]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a mounting structure for an expansion joint which allows the expansion joint to be easily replaced.

[0012]

According to the present invention, an expansion joint mounting structure includes an anchor bolt 2 buried under a bottom surface of each joint arranging cut-out portion h of an opposing bridge girder H. It is a structure in which the expansion joint 1 is bolted in such a manner as to be bridged between the joint digging portions h, h by using the mounting holes 10 formed on both edges in the width direction. , 2 are buried with replacement anchor bolts 2a. The anchor bolts 2 and 2a are provided with a female screw body 20 arranged flush with the bottom surface of the joint arrangement cutout portion h, and an anchor bolt main body 21 fixed to the female screw body 20. In a mode in which the headed bolt 3 is screwed into the female screw body 20, it is preferable that the peripheral portion of the mounting hole 10 of the expansion joint 1 be sandwiched between the female screw body 20 and the headed bolt 3. It is preferable that an integral number of replacement anchor bolts 2a are provided between the anchor bolts 2 and 2.

The operation and effect of the expansion joint mounting structure of the present invention will be clarified in the following embodiments of the present invention.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

In this embodiment, as shown in FIGS. 1 and 2, each of the joint digging portions h on the opposing bridge girders H, H
The expansion joint 1 is bolted in such a manner as to be bridged over the joint arrangement cutouts h, h using the exposed upper end portions of the anchor bolts 2 respectively buried under the bottom of the joint. [Structure of expansion joint 1 ] The expansion joint 1 is basically composed of an elastic rubber material 12 having excellent wear resistance and a lower surface near the center upper surface and the center except for the center as shown in FIGS. The mounting hole 1 including the steel plate 11 buried near the lower surface described above.
0 is formed. As shown in FIG. 2, the upper portion of the mounting hole 10 of the expansion joint 1 forms a large-diameter hole portion 13 in which the headed bolt 3 is rotatably accommodated when the expansion joint 1 is mounted. It is. Here, in this embodiment, the formation pitch P of the mounting holes 10 shown in FIG. 1 is 300 mm. [About the cutout part h for joint arrangement and the anchor bolt 2]
As shown in FIGS. 1 and 2, the cutout portion h for joint arrangement is formed in accordance with the thickness and width of the expansion joint 1, and when the joint is installed, the upper surface of the cutout portion h and the upper surface of the expansion joint 1. And are almost flush.

The anchor bolt 2 is, as shown in FIG.
The female screw body 20 is disposed flush with the bottom surface of the joint arranging portion h and has an exposed upper surface; and an anchor bolt main body 21 fixed to the female screw member 20. It is buried under the bottom of the part h. In addition, the embedding pitch P1 of the anchor bolt 2 is set to 300 mm in accordance with the formation pitch P of the mounting holes 10.

In this embodiment, as shown in FIG. 3, in addition to the anchor bolt 2 used at the time of new construction, a replacement anchor bolt 2a used at the time of replacing a joint is used.
Is embedded in the center between the anchor bolts 2 and 2 (at a position P1 / 2 from one anchor bolt 2). In addition,
The replacement anchor bolt 2a has exactly the same configuration as the anchor bolt 2. [When the expansion joint 1 is attached at the time of new construction] As shown in FIGS.
In a state where the screw hole No. 0 and the mounting hole 10 of the expansion joint 1 are opposed to each other, the headed bolt 3 is screwed into the female screw body 20, and the peripheral portion of the mounting hole 10 of the expansion joint 1 is female screw body. 20 and a bolt 3 with a head (via a washer).

Before the expansion joint 1 is mounted, the screw holes of the female screw body 20 of the replacement anchor bolt 2a are filled with a rust-preventive sealing material. [When replacing expansion joint 1] Rusted anchor bolt 2
The head of the headed bolt 3 fixed to the female screw body 20 is removed and the washer is removed.

Next, the sealing material for rust prevention filled in the screw hole of the female screw body 20 of the replacement anchor bolt 2a is removed.

Subsequently, as shown in FIGS. 2 and 4 below,
With the screw hole of the female screw body 20 of the replacement anchor bolt 2a and the mounting hole 10 of the expansion joint 1 facing each other, the headed bolt 3 is screwed into the female screw body 20 to mount the expansion joint 1. The replacement operation is completed by clamping the peripheral portion of the hole 10 between the female screw body 20 and the headed bolt 3 (via a washer). In this case, the expansion joint 1 is shifted by P1 / 2 as compared with that at the time of new construction, but this is not a serious problem.

As described above, when this structure is adopted, the replacement work of the anchor bolt, which is difficult on site, is eliminated, so that the expansion joint 1 can be replaced very easily. [Other Embodiments] A plurality of replacement anchor bolts 2a may be provided between the anchor bolts 2 and 2, instead of one.
In this case, the expansion joint 1 can be easily replaced by the number of replacement anchor bolts 2a between the anchor bolts 2 and 2. The integer number of replacement anchor bolts 2a is preferably provided at a constant pitch between the anchor bolts 2 and 2, but is not limited thereto, and may be at an irregular pitch. To make the pitch of the replacement anchor bolts 2a unequal, the distance from one anchor bolt 2 of the adjacent pair of anchor bolts 2, 2 to the replacement anchor bolt 2a is set between the anchor bolts of each set. Must be set equal. As the headed bolt 3, a bolt formed by screwing a nut into a rod-shaped male screw can be employed.

On the other hand, the anchor bolt main body 21 is
The female screw body 20 is made of a long material as shown in FIG. 5 and is erected between the anchor bolt main bodies 21, 21..., And a plurality of screw holes are formed on the upper surface thereof. It may be formed individually. In this case, the screw holes other than both ends correspond to the female screw body 20 of the replacement anchor bolt 2a. Therefore, the same effect as that of the above-described embodiment can be obtained without burying the replacement anchor bolt 2a.

[0023]

Since the present invention has the above-described configuration, it has the following effects.

From the contents described in the section of the embodiment of the present invention, it was possible to provide a mounting structure of an expansion joint capable of easily replacing the expansion joint.

[Brief description of the drawings]

FIG. 1 is a perspective view of an expansion joint mounting structure according to an embodiment of the present invention.

FIG. 2 is a sectional view of a mounting structure of the expansion joint.

FIG. 3 is a plan view showing a joint digging portion in the mounting structure of the expansion joint, and arrangement of anchor bolts for new construction and anchor bolts for replacement.

FIG. 4 is a plan view showing an installation position of an expansion joint at the time of new construction, and a lower drawing is a plan view showing an installation position of an expansion joint after replacement. Attach 1.

FIG. 5 is a perspective view showing another embodiment of the anchor bolt.

FIG. 6 is a plan view showing the arrangement of a joint arrangement cutout portion and anchor bolts in a conventional expansion joint installation structure.

FIG. 7 is a cross-sectional view showing an example of a conventional expansion joint mounting structure.

FIG. 8 is a cross-sectional view showing another example of a conventional expansion joint mounting structure.

[Explanation of symbols]

 H Bridge girder h Joint cut-out section 1 Expansion joint 2 Anchor bolt 2a Replacement anchor bolt 3 Headed bolt 10 Mounting hole 20 Female screw body 21 Mainly anchor bolt

Claims (6)

[Claims] 1. Anchor bolts (2) buried under the bottom surface of each joint arrangement cutout (h) in opposed bridge girders (H) and (H), and both widthwise edges of an expansion joint (1). A structure in which the expansion joint (1) is bolted in such a manner that the expansion joint (1) is bridged between the joint arrangement cutout portions (h) and (h) using the mounting holes (10) formed in the anchors. Replacement anchor bolt (2) between bolts (2)
A mounting structure for an expansion joint, wherein a) is embedded. 2. An anchor bolt (2) (2a) is fixedly attached to a female screw body (20) arranged flush with the bottom surface of the joint digging portion (h), and to the female screw body (20). And a peripheral portion of the mounting hole (10) of the expansion joint (1) by screwing the headed bolt (3) into the female screw body (20). Female screw body (2
2. The mounting structure for an expansion joint according to claim 1, wherein the expansion joint is clamped by a bolt (3) and a head bolt (3). 3. The expansion joint mounting structure according to claim 1, wherein an integral number of replacement anchor bolts (2a) are provided between the anchor bolts (2). 4. An integral number of replacement anchor bolts (2a).
The expansion joint mounting structure according to any one of claims 1 to 3, wherein the anchors are provided at equal pitches between the anchor bolts (2). 5. The mounting structure for an expansion joint according to claim 1, wherein the head bolt (3) has a head and a screw part integrally formed. 6. The head bolt (3) is formed by screwing a nut into a rod-shaped male screw.
A mounting structure for an expansion joint according to any one of claims 1 to 4.