JPH0449210Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a mounting portion of a precast concrete deck that is fixedly installed, for example, on a steel girder.

BACKGROUND ART FIG. 9 is a perspective view showing a typical prior art. A plurality of dowels 2 are planted in the upper flange 1a of the steel girder 1. A precast concrete deck slab 3 fixedly installed on the steel girder 1 has through holes 4 formed in advance at positions corresponding to the dowels 2. Precast concrete slab 3 and steel girder 1
When installing the precast concrete slab 3 on the upper flange 1a so that the dowel 2 is placed in the through hole 4, cement mortar or Filler material such as concrete is poured into it and allowed to cure for a certain period of time. As a result, the precast concrete deck slab 3 is fixed onto the steel girder 1.

Problems to be solved by the invention In the above prior art, when the precast concrete slab 3 becomes obsolete and is replaced, not only the precast concrete slab 3 must be cut and removed, but also the dowel 2 must be removed. Therefore, when installing a new precast concrete deck slab 3, it is necessary to recast a new dowel 2 into the steel girder 1. Therefore, the replacement work is time-consuming and leads to an increase in costs. Further, when integrating the precast concrete slab 3 and the steel girder 1, it is necessary to inject a filler, and a curing period for this filler is required. Therefore, there is a problem that the construction period is relatively long.

Furthermore, in the above-mentioned prior art, each precast concrete slab adjacent to each other in the direction perpendicular to the bridge axis is joined by a filler filled in the gap between the mutually opposing end surfaces, but during the daytime, nighttime, or summer. There is a problem in that the steel girder expands or contracts in the bridge axis direction due to temperature changes such as in winter, causing misalignment between the precast concrete slabs and creating gaps. When such a gap occurs, the filler material is missing or caves in, which causes the roadbed to cave in. In order to solve this problem, conventionally, the mutually opposing end surfaces of precast concrete slabs are formed into an uneven shape to improve the joint strength. In limited cases where it is necessary to remove the precast concrete slab, there is a problem in that the precast concrete slab that does not need to be removed is also damaged.

Therefore, the purpose of this invention is to connect precast concrete slabs adjacent to each other in the direction perpendicular to the bridge axis with great strength, and to easily and quickly connect the precast concrete slabs that do not need to be replaced without damaging them. To provide a structure of an attachment part of a precast concrete floor slab, which allows the aging precast concrete floor slab to be replaced.

Means for Solving the Problems The present invention provides the above flange 22 and the lower flange 2.
3, and a belly plate 24 connecting each flange 22, 23.
The upper flange 22 has a plurality of first through holes 25 at intervals in the bridge axis direction, and the belly plate 24 has a plurality of first through holes 25 at intervals in the bridge axis direction.
A plurality of steel girders 12 formed on both sides with respect to a virtual plane including the bridge axis and extending in the bridge axis direction at intervals in the direction perpendicular to the bridge axis, a retaining part 16 to which a plurality of stud dowels 19 are fixed, a joint part 17, and a retaining part 12. 16 and a web 18 connecting the joint part 17, and the joint part 17 has a first web formed on the upper flange 22.
A mounting member 41 having a substantially C-shaped cross section perpendicular to the axis, in which a plurality of second through holes 20 are formed corresponding to the through holes 25, and at least the retaining portion 16 is embedded in the end portion in the bridge axis direction, and are integrally formed. A flat concrete slab main body 14 is fixed to the main body 14 and has an end surface 14a formed in the same plane as the side surface 18a of the web 18. The bolt 26 is inserted into the first and second through holes 25 and 20 while being mounted on the vehicle.
and a nut 27 screwed onto this bolt 26
and each side surface 18a facing each other on the steel girder 12.
This is a structure of an attachment part of a precast concrete slab, characterized in that it includes a filler 60 filled in a gap formed between the end faces 14a and between the end faces 14a.

Effect According to the present invention, the concrete slab body is integrally fixed to the retaining part of the mounting member, and the joint part of the mounting member and the steel girder are connected by bolts and nuts. The mounting members including the concrete slab body and the steel girder are removably fixed. Therefore, as mentioned in relation to the prior art, when replacing the precast concrete slab on the steel girder, there is no need to recast the dowel etc., thereby reducing the time required to replace the precast concrete slab. By making it shorter, the labor and cost required for replacement work can be reduced. In addition, the side surfaces of the mounting members and the end surfaces of the concrete deck main body are formed in the same plane, and each precast concrete deck adjacent in the direction perpendicular to the bridge axis is formed with each side surface and each end surface facing each other. The filler filled in the voids between the two bridges creates a bond with great strength, and it is possible to prevent the filler from peeling off due to displacement of each precast concrete slab in the bridge axis direction.

Embodiment FIG. 1 is a front view showing the basic structure of the present invention, and FIG. 2 is an exploded perspective view of FIG. 1. The bridge 11 includes a plurality of steel girders 12 arranged at regular intervals in the direction perpendicular to the bridge axis (left-right direction in FIG. 2).
and a precast concrete deck slab 13 fixedly arranged on the steel girder. This precast concrete slab 13 includes a flat concrete slab body 14 and a concrete slab body 1.
4 to the steel girder 12. The mounting member 15 has an I-shaped cross section perpendicular to the axis, and includes a retaining portion 16 buried in the concrete slab body 14, a joint portion 17 exposed to the outside facing the steel girder 12, and the retaining portion 16 and the joint portion 17. and a web 18 connecting the two. A plurality of stud dowels 19 are implanted in the retaining portion 16 in advance by welding or the like. Therefore, the mounting member 15 is reliably fixed to the concrete slab body 14. As is clear from FIG. 7, the retaining portion 16 and the joint portion 17 are parallel to each other and extend substantially parallel to the concrete slab body 14.

A plurality of through holes 20 are formed in the joint portion 17 along the member axis direction A. One row of such through holes 20 is formed on each of the left and right sides of the web 18.

A plurality of reinforcing members 21 are provided between the retaining portion 16 and the joining portion 17 at regular intervals along the member axis direction A. This reinforcing member 21 is attached at right angles to the member axial direction A.

The steel girder 12 has an upper flange 22 and a lower flange 2.
3, and a belly plate 24 that connects the upper flange 22 and the lower flange 23. The upper flange 22 has
A through hole 25 is formed at a position corresponding to the through hole 20 of the joint portion 17 .

When installing the precast concrete slab 13 to the steel girder 12 having such a configuration,
First, the joint portion 17 is mounted on the upper flange 22.
In this state, the bolt 26 is inserted into the through holes 20 and 25.
are sequentially inserted through the bolts 26, and the nuts 27 are screwed into the portions of the bolts 26 exposed downward from the through holes 25 and tightened. In this way, the precast concrete deck slab 13 is fixed to the steel girder 12.

Note that after the plurality of precast concrete deck slabs 13 are attached to the steel girder 12 in this way, a filler 60 such as cement mortar is injected into the gap between the adjacent concrete slab bodies 14. Thereby, each adjacent concrete slab body 14 is connected.

In this way, the precast concrete slab 13 is attached to the steel girder 12 by the bolts 26 and nuts 27.
Since the precast concrete deck slab 13 can be fixed to the steel girder 12 without requiring a curing period for filler such as cement mortar as in the prior art, the installation It becomes possible to reduce working time as much as possible.

In this way, the concrete deck main body 14 of the constructed bridge 11 becomes obsolete due to long-term use, and therefore, it becomes necessary to replace the concrete deck main body 14. Such concrete slab body 14
When replacing the bolt, replace nut 27 with bolt 2.
6, the precast concrete deck slab 13 is removed from the steel girder 12. Then, a new precast concrete deck slab 13 is attached to the steel girder 12 by the process described above. In this way, by removing the nuts 27 from the bolts 26, the precast concrete deck slab 13 can be easily removed from the steel girder 12. Therefore, the precast concrete deck slab 13 can be easily removed from the steel girder 12 in a relatively short time. It becomes possible to remove it from 12. Therefore, it is necessary to cut and cut the floor slab as in the past.
There is no need to remove or reshape the dowel, which greatly improves work efficiency and reduces replacement costs.

The precast concrete floor slab 13 is manufactured in advance at a factory or the like by the following method. That is, as shown in FIG. 3, the formwork 30 is open at the top and has a roughly U-shaped cross section perpendicular to the axis.
and a support member 31 that covers the upper part of the formwork 30 and whose cross section perpendicular to the axis has a roughly inverted U-shape is prepared. First, the joint portion 17 of the attachment member 15 is fixed to the support member 31 via the wire 32. And at this time,
The wire 32 is adjusted and suspended so that the retaining portion 16 of the attachment member 15 is positioned within the formwork 30. In this state, the formwork 30 is filled with concrete. Then, by curing for a certain period of time, the precast concrete floor slab 13 is manufactured.

As another method for manufacturing the precast concrete slab 13, as shown in FIG. 4, a pair of half-split formworks 33a and 33b are prepared. Notches 34a and 34b are formed in the abutting surfaces of these forms 33a and 33b. The insertion hole 35 is constituted by these notches 34a and 34b. First, the mounting member 15 is erected with the joint portion 17 in contact with the ground 36. Then, the molds 33a and 33b are butted together so that the web 18 passes through the insertion holes 35 of the molds 33a and 33b, and the molds 33a and 33b are mounted on the support stand 37. In this state, the formworks 33a, 33
Concrete is poured in area b and allowed to cure for a certain period of time. Thereafter, the precast concrete floor slab 13 is manufactured by removing the forms 33a and 33b.

As an example showing other configurations of the precast concrete slab 13, as shown in FIG. As shown in FIG. 6, only the dowel 19 may be buried in the concrete slab body 14.

FIG. 7 is a sectional view of one embodiment of the present invention.
Note that parts corresponding to the configurations shown in FIGS. 1 to 6 are given the same reference numerals. What should be noted is that the precast concrete slab 40 has attachment members 41 attached to the ends of the concrete slab body 14. The mounting member 41 has a substantially C-shaped cross section perpendicular to the axis, and includes a retaining portion 16 , a joint portion 17 , and a web 18 connecting the retaining portion 16 and the joint portion 17 . The side surface 18a of the web 18 is substantially in the same plane as the end surface 14a of the concrete slab body 14.

When installing the precast concrete deck slab 40 having such a configuration to the steel girder 12, the steel girder 12 must be installed in such a state that a gap is formed between the mounting members 41 of each precast concrete deck slab 40. to be boarded.

In this state, bolt 26 and nut 2
7, the concrete slab body 14 is attached to the steel girder 1.
Fixed at 2. Thereafter, by pouring a filler 60 such as cement mortar or concrete into the gap and curing it for a certain period of time, the adjacent concrete slab bodies 14 are connected.

Note that the mounting member 41 may be configured such that only the retaining portion 16 and the dovetail 19 are buried in the concrete slab body 14, as shown in FIG.

In the above embodiment, the precast concrete deck slabs 13, 40 attached to the steel girder 12 of a bridge have been described, but the precast concrete deck slabs 13, 40 according to the present invention can also be suitably applied to floors of buildings, etc. I can do it.

Effects As described above, according to the present invention, the mounting member is integrally fixed to the end of the concrete deck body in the bridge axis direction, and this mounting member is connected to the steel girder using bolts and nuts. Therefore, the mounting members including the concrete slab body and the steel girder are removable, which makes it possible to easily and quickly perform the replacement work when replacing the concrete slab body. In addition, it is possible to reduce labor and costs, and to connect the joint between adjacent precast concrete slabs on the steel girder with great strength. In addition, gaps are formed on the steel girder between the sides of the mounting members that face each other and between the end faces of the concrete slab body, and this gap is filled with the filler material, so it is filled with a large adhesion area. It becomes possible to attach the filling material to the side surface and the end surface, and it is possible to minimize the occurrence of gaps between the filler material and the side surface and the end surface. In this way,
Since the filler material reliably adheres to the side surfaces and end faces within the void, there is no risk that the filler material within the void will cave in or be lost, and therefore the subgrade will not be damaged due to such defects or cave-ins. It is possible to prevent cave-ins, keep the roadbed surface flat, and prevent vibrations caused by vehicle traffic.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the configuration that is the premise of the present invention, Fig. 2 is an exploded perspective view of Fig. 1, and Figs. 5 is a sectional view showing another configuration of the precast concrete floor slab 13, and FIG. 6 is a sectional view of the precast concrete floor slab 13.
FIG. 7 is a cross-sectional view of one embodiment of the present invention, FIG. 8 is a cross-sectional view of another embodiment of the present invention, and FIG. 9 is a typical prior art. FIG. 11...Bridge, 12...Steel girder, 13,40...
Precast concrete floor slab, 14...Concrete floor slab body, 15, 41...Mounting member, 16
...Keeping part, 17...Joint part, 18...Web,
19... Jibel, 20, 25... Through hole, 21...
Reinforcement material, 26...bolt, 27...nut.

Claims (1)

[Claims for Utility Model Registration] It has an upper flange 22, a lower flange 23, and a belly plate 24 that connects the flanges 22 and 23, and the upper flange 22 has a plurality of holes spaced apart from each other in the bridge axis direction. First through holes 25 are formed on both sides of the virtual plane including the belly plate 24, and a plurality of steel girders 12 extending in the bridge axis direction at intervals perpendicular to the bridge axis and a plurality of stud dowels 19 are fixed. It has a retaining part 16, a joint part 17, and a web 18 connecting the retaining part 16 and the joint part 17.
A mounting member 41 having a substantially C-shaped cross section perpendicular to the axis, in which a plurality of second through holes 20 are formed corresponding to the through holes 25, and at least the retaining portion 16 is embedded in the end portion in the bridge axis direction, and are integrally formed. A flat concrete slab main body 14 is fixed to the main body 14 and has an end surface 14a formed in the same plane as the side surface 18a of the web 18, and a joint 17 of the mounting member 41 is mounted on the upper flange 22 of the steel girder 12. The bolt 26 is inserted into the first and second through holes 25 and 20 while being mounted on the vehicle.
and a nut 27 screwed onto this bolt 26
and each side surface 18a facing each other on the steel girder 12.
A structure of an attachment part of a precast concrete floor slab, characterized in that it includes a filler 60 filled in a gap formed between the gap and between each end face 14a.