JPS6028962B2 - Construction method of road joint expansion and contraction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for constructing a thick-toothed concrete layer interlocking type road joint expansion/contraction device applied to a road bridge in which PC girders are constructed in parallel between supports.

The above-mentioned interlocking type road joint expansion/contraction device of the secondary type has a notch step formed at each of the opposing ends of the bridge girder, and a pair of corrugated end plates having a height reaching from the bottom surface of the notch step to the road surface. They are provided oppositely with a meshing play, which is fixed using a support village on top of the notch step, and a back-beat village is driven on the back of both corrugated end plates to form a tooth-shaped joint that meshes with each other. However, forming the notched step requires a great deal of time and effort, and the higher the height of the corrugated end plate, the more difficult it is to process. Therefore, the height of the concrete cast behind the corrugated end plate is approximately 20 degrees, and there is a problem that a joint with high joint strength cannot be obtained.

In view of this, the present invention provides a road bridge in which PC girders arranged in the bridge length direction are arranged side by side with gaps in the road direction.
Reinforcing bars arranged in the bridge length direction are provided in the gaps between these parallel PC girders, and the ends of these reinforcing bars are made to protrude from the gaps between the PC girders and beyond the PC girders into the bridge girder gap, and the wall surface between the space between the PC girders and the bridge girders is A corrugated formwork with vertical direction is temporarily installed, concrete is poured from both backs of the corrugated formwork across the gap between the parallel PC girders, and after the concrete has hardened, the corrugated formwork is removed. Provided is a method for constructing a road joint expansion/contraction device, which is characterized in that a pair of tooth joints having opposing concrete corrugated end faces and interlocking concrete constituting a crossbeam are connected with reinforcing bars by doing so. It is an object of the present invention to eliminate the above-mentioned conventional drawbacks.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below based on embodiments with reference to the drawings.

Example 1 First, a road joint expansion and contraction device (see FIG. 1) constructed by the method of the present invention will be described.

1 is constructed in parallel between the pillars of a road bridge (not shown)
A type of PC (prestressed concrete) girder,
Each PC girder 1 extends in the bridge length direction with a gap in the direction of the road, and tension steel members 2, 2, . . . are buried inside.

3 is a tooth joint formed continuously on the PC girder 1,
The base 4 and the thick-toothed protrusions 5, 5, . The thick-toothed protrusions are engaged with each other with a certain engagement clearance 6.

7 is the main reinforcing bar, 8 is the reinforcing bar arranged in the bridge length direction, and 1 is the reinforcing bar.

Reference numeral 11 denotes a U-shaped gutter body, which is supported by gutter body supports 12 disposed below the meshing gap 6 at regular intervals in the road width direction.

The gutter support body 12 is attached by bolts 15 and nuts 16 to the lower flanges 14b, 14b of the PC beams 1, 1, with mounting flanges 13a, 13b facing each other.
Incidentally, a hole 17 is bored in one of the mounting flanges 3a, and a bolt 15 is provided so as to freely move within the long hole according to the expansion and contraction of the road. 18 is pavement, 19 is filler concrete, which constitutes the cross girder of a road bridge, and the above-mentioned reinforcing bars 8 connect this filler concrete 19 in the gap between the PC girders 1 and 1 and the tooth joint 3. are combined.

Next, a method of constructing the road joint expansion and contraction device will be explained based on FIGS. 2 and 3.

In the first step, PCs facing each other at a factory etc.
Bolts 15 are attached to the attachment holes drilled in the lower flanges 14b, 14b of the girders 1, 1.

Next, the main bars 7 and reinforcing bars 10 were welded and fixed to the reinforcing bars 8 arranged in the bridge length direction, and the ends of the reinforcing bars 8 to which the main bars 7 and reinforcing bars 10 were fixed were made to protrude from the PC girder 1 side into the bridge girder gap. In this state, the PC girder 1 is installed with a vertical reinforcement 9 inserted between the upper flange 14a and the lower flange 14b. In the second step, the bottom form 20 is fixed under the bridge girder gap with or without bolts 15, and the bottom form is placed on top of the lower bottom form with the same thickness as the 10 girder gap calculated from the expansion/contraction rate of the road bridge. A corrugated formwork 21 made of foamed plastic having a wall surface is temporarily installed with the wall facing vertically.

The corrugated formwork needs to be at least as tall as the road surface than the bottom of the PC girder (see Figure 2). In the third step, concrete is poured from both backs of the corrugated formwork 21 to the PC girder 1.
, 1 to approximately the same height as the road surface height, and after the concrete has solidified, the bottom form 20 is removed or left in place and the corrugated form 21 is melted by heat treatment, chemical treatment, etc. Alternatively, the toothed joint 3 and the filler concrete 19 are formed by removing it by extraction.

Next, the gutter body support 12 is fixed using the bolts 15 that were fixing the bottom formwork 20, and the gutter body 1 is placed on top of the gutter body support.
1 (see Figure 1). Note that the corrugated formwork 2
1 is made of foamed plastic that has been molded by blowing and molding, but it may also be made of wood, rubber, etc., or a tube formwork in which air is injected.Furthermore, As shown in FIG. 4, a pair of corrugated plates 22, 22 may be used, each having an outer end surface 22a to form a concrete corrugated opposing end surface and an inner end surface 22b disposed opposite to each other with an interlocking gap.

The corrugated plate 22 can be made of a wooden plate, an iron plate, or the like. Further, the corrugated formwork 21 may have horizontal stripes attached at regular intervals to the upper end.

When a horizontal pestle is installed, the corrugated formwork 21 will pave the Fujimura 18
, 18, the height can be determined easily and it is firmly supported, and it has the advantage that even after concrete is poured, it can be easily removed by lifting the horizontal wall. Example 2 This example is shown in FIG. 5, and in order to strengthen the toothed joint 3, concrete is poured on the back of the corrugated formwork 21 from the bottom of the PC girder 1 to the top surface of the PC girder 1 to form a lower concrete layer 23a.
is formed, and a post-casting material made of a strong material such as concrete, resin mortar, synthetic resin, rubber, etc. is cast on the lower concrete layer to form an upper post-casting layer 24a, etc. is the same as in Example 1.

Example 3 This example is shown in FIGS. 6 to 9. In order to strengthen the tooth joint 3, the upper portions of the opposite ends of the PC girders 1, 1 are cut in advance to form a stepped portion, and the concrete is poured into the PC girder. A lower concrete layer was formed by pouring concrete from the bottom of the concrete to the step part, and an upper concrete layer was formed by pouring a post-concrete material from the step part to the road surface. The same is true.

That is, in the road joint expansion and contraction device shown in FIG. 6, a stepped portion 25a is formed by cutting out the upper part of the upper flange 14a of the PC girder 1 as shown in FIG. A batting layer 24b is formed. On the other hand, the road joint expansion and contraction device shown in Fig. 8 has a PC girder 1 as shown in Fig.
A step 25b is formed by cutting out the upper surface of the web 26 in the shape of a chair, and an upper trailing layer 24c extending from the upper surface of the step to the road surface is formed. In each of the above embodiments, a gutter body is used as a water stop means, but other water stop means as shown in FIGS. 10 to 13 described below may be used.

The water stop means shown in FIG. 10 has an M-shaped elastic member 29 bent in a substantially M-shaped cross section inserted into the meshing gap 6, and both sides of the M-shaped elastic member 29 are tooth-shaped. A bent corrugated support plate 30 is closely fixed to the end face of the joint 3, and the corrugated support plate is supported by supporting bars 31 protruding from the back surface embedded in the toothed joint 3. Further, the water stop means shown in FIG. 11 uses a U-shaped elastic member 32 bent to have a substantially U-shaped cross section in place of the M-shaped elastic member 29. In the water stop means shown in FIG. 12, a backup material 33 is placed in the meshing gap 6 with both sides tightly attached to the end surfaces of the toothed joints 3, 3, and a filled rubber material 34 is placed on top of the backup material 33.
It is filled with.

The water stop means shown in FIG. 13 has a sealer 36 in which three seal units each having an iron core 35 embedded in an elastic body having a substantially elliptical cross section are bonded in parallel, and both sides of the sealer 36 are closely attached to the end surfaces of the toothed joints 3, 3. This is what happens.

In addition, in the third embodiment, when turning the toothed joint 3, concrete to form the lower concrete layer is poured,
Although the upper post-concrete layer is formed by pouring the upper post-concrete material on top of this, the tooth-shaped joint 3 may also be formed by pouring only concrete from the road surface to the bottom of the bridge girder as in Example 1. be. Therefore, according to the present invention, reinforcing bars are provided from the gap between the PC girders to the gap between the bridge girders, and corrugated formwork is temporarily installed between the bridge girder gaps and concrete is poured, thereby forming interstitial concrete and this interfilling concrete. On the other hand, it is possible to simultaneously obtain a thick and strong tooth-shaped joint connected with reinforcing bars in an integrated state, thereby saving labor and time required for turning compared to conventional methods, and creating an expansion device with high load-bearing strength. can be constructed.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the present invention; FIG. 1 is a perspective view showing the road joint expansion and contraction device of Example 1, FIG. 2 is a cross-sectional view of the road joint before concrete placement, and FIG. 4 is a perspective view of another example of the corrugated formwork, FIG. 5 is a sectional view of the road joint expansion and contraction device of Example 2, and FIG.
9 to 9 show Example 3, FIGS. 6 and 8 are cross-sectional views showing an example of a road joint expansion and contraction device, and FIGS. 7 and 9 are shown in FIGS. 6 and 8, respectively. A perspective view of the PC girder applied to the road joint expansion and contraction device, and FIGS. 10 to 13 are sectional views showing other embodiments of the water stop means, respectively. 1...PC girder, 3...tooth joint, 4...
...Base, 5...Thick toothed protrusion, 6...
...Meshing play, 21... Waveform formwork, 22...
・Corrugated board. Figure 1 Figure 2 Figure 3 Figure 4 Figure 8 Figure 9 Figure 5 Figure 6 Figure 7 Figure 10 Figure 11 Figure 12 Figure 13

Claims (1)

[Scope of Claims] 1. In a road bridge in which PC girders arranged in the bridge length direction are arranged side by side with gaps in the road width direction, reinforcing bars arranged in the bridge length direction are installed in the gaps between the PC girders arranged in parallel. Set the end of this reinforcing bar to P
The PC girder ends are projected from the gap of the C girder into the bridge girder gap, and a corrugated formwork with the wall surface oriented vertically is temporarily installed in the bridge girder gap, and the above-mentioned parallel P
By pouring concrete across the gap between the C girders and removing the corrugated formwork after the concrete has solidified, a pair of toothed joints with opposing concrete corrugated end faces and a crossbeam are constructed. A method for constructing a road joint expansion/contraction device characterized by forming concrete in a state where it is joined with reinforcing bars. 2. The method for constructing a road joint expansion/contraction device according to claim 1, wherein the corrugated form has both side surfaces to form concrete corrugated opposing end surfaces and is molded from a cast material. 3. The method for constructing a road joint expansion/contraction device according to claim 1, wherein the corrugated formwork has both side surfaces to form concrete corrugated end faces and is made of wood or the like. 4. The road joint expansion and contraction according to claim 1, wherein the corrugated formwork is a pair of corrugated plates having outer end surfaces to form concrete corrugated opposing end surfaces, and inner end surfaces of which are disposed opposite each other with an interlocking gap. How to build the device.