JP3595281B2 - Road repair method and PCa version - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a precast reinforced concrete slab (referred to as “PCa slab” in the present invention) and a method for repairing a road.
[0002]
[Prior art]
In the structure of the road near the abutment, a pavement joint that absorbs thermal expansion and contraction of the bridge is placed between the abutment-side pavement and the bridge-side pavement, and the abutment is opposite to the bridge (the opposite of the bridge). There are many structures that do not support the abutment on the pavement of the earthwork section located on the side.
[0003]
On a road with such a structure, the sediment on the back side of the abutment (the opposite side of the bridge) (sand of the earthwork) consolidates and sinks, resulting in a step between the abutment side pavement and the earthwork side pavement. Occurs. When such a step is formed, large vibration and noise are generated when the vehicle passes through the step.
[0004]
[Problem to be solved]
In order to eliminate the step, the pavement on the abutment and the pavement of the earthwork part near the abutment are removed, earth and sand are put at the removed portion, the earth and sand are compacted, and then the PCa plate is placed at that location to make the PCa. A repair method in which a part of the slab is received by an abutment, concrete is poured on the PCa slab, and the solidified material is integrated with the pavement on the bridge side (hereinafter referred to as “extended floor slab”). Has been proposed.
[0005]
However, in the above-mentioned repair method, although the extension slab must be displaceable with respect to the pavement of the bridge and the existing pavement remaining on the PCa slab and the earthwork section side, the extension slab is solidified by the poured concrete. The slab couples or engages with the PCa slab and the remaining existing pavement on the earthwork side, so that the extended slab cannot be displaced relative to the PCa slab and the remaining existing pavement on the earthwork side. Further, in the above-mentioned repair method, it is difficult to form the extended floor slab such that it can be displaced with respect to the PCa plate and the remaining existing pavement on the earthwork section side, and the repair requires a long time.
[0006]
An object of the present invention is to provide an abutment and a road in the vicinity thereof such that a step is not formed thereon again and that the extended floor slab can be displaced with respect to the PCa slab and the remaining existing pavement on the earthwork section side in a short time. To be easily repairable.
[0007]
[Solutions, actions and effects]
The method for repairing a road according to the present invention includes a first step of removing at least a part of an existing pavement from a part on an abutment to a part on an earthwork part side, and an L-shaped cross-sectional shape having a projecting region at one end. The first PCa plate is received directly or indirectly on the abutment with its protruding area facing the remaining existing pavement side on the earthworking part side and facing upward, and the other end of the first PCa plate is directly received by the abutment. A second step of disposing the existing pavement in the removed state, and a third step of disposing a plate-like second PCa plate on the first PCa plate closer to the bridge portion than the projecting region. Steps.
[0008]
Since the first PCa plate can receive the other end on the abutment, the first PCa plate has the function of a stepping plate, and thus prevents a step from being formed between the pavement on the abutment side and the pavement on the earthwork part side.
[0009]
On the other hand, since the second PCa plate is not made of so-called cast-in-place concrete, there is no possibility that the second PCa plate is connected or engaged with the first PCa plate or the remaining existing pavement on the earthwork part side. It is displaceable with respect to the first PCa plate and the remaining existing pavement on the side of the earthwork section.
[0010]
The protruding region of the first PCa plate is used as a pavement joint placement point together with the second PCa plate, with the other edge facing the edge of the second PCa plate. Since this joint arrangement location is located on the earthwork portion side, vibration and noise caused by the collision of the traveling vehicle with the pavement joint are absorbed by earth and sand on the earthwork portion side and are small.
[0011]
As described above, according to the present invention, the abutment and the road in the vicinity thereof can be displaced so that the steps are not formed again, and the extended slab can be displaced with respect to the PCa slab and the remaining existing pavement on the earthworking section side. Thus, repair can be easily performed in a short time.
[0012]
The first step may include removing at least a part of the existing pavement of the bridge. By doing so, the second PCa plate can be connected to the existing pavement of the bridge portion by utilizing the pavement removal area of the bridge portion.
[0013]
The second step may include injecting a backfill material below the first PCa plate after adjusting the height of the first PCa plate. By doing so, the height condition of the repaired area can be adjusted to the height of the remaining existing pavement, and the first PCa plate is connected to the lower earthwork.
[0014]
The third step includes disposing a resin sheet on the first PCa plate closer to the bridge than the protruding region, and disposing the second PCa plate on the sheet. Can be. In this case, since the sheet is positioned between the first and second PCa plates, the displacement of the second PCa plate with respect to the first PCa plate becomes smooth. However, without using such a sheet, the second PCa plate may be brought into contact with the first PCa plate closer to the bridge portion than the projecting region.
[0015]
The repair method may further include a fourth step of coupling the second PCa plate to the remaining existing pavement on the bridge side at an appropriate time after the third step. By doing so, the expansion and contraction on the bridge portion side is transmitted to the second PCa plate, and is absorbed by a change in the space between the projection region of the first PCa plate and the second PCa plate.
[0016]
The fourth step may include connecting the reinforcing bar of the second PCa plate and the reinforcing bar of the existing pavement on the bridge side, and placing concrete in the connecting portion. By doing so, the reinforcing bar of the second PCa plate and the remaining existing pavement on the bridge portion side are firmly connected.
[0017]
The repair method may further include a fifth step of connecting the projecting region of the first PCa plate and the second PCa plate with a joint at an appropriate time after the third step. . By doing so, the seam between the projecting area of the first PCa plate and the second PCa plate is closed.
[0018]
The repair method may further include a sixth step of combining the first PCa plate and the remaining existing pavement on the earthworking section side at an appropriate time after the third step. By doing so, there is no gap between the projecting area of the first PCa plate and the remaining existing pavement on the earthworking part side.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a PCa plate (that is, a precast reinforced concrete plate) according to the present invention and a road repair method using the same will be described with reference to the drawings.
[0020]
Referring to FIGS. 1 and 2, the road 10 to be repaired has a two-lane up line 12 and a two-lane down line 14 separated by a median strip 16 and fences 18 at both ends in the width direction of the road. It is an example of a road, especially an expressway. Each of the ascending line 12 and the descending line 14 has a pavement region of the earthwork portion 20 and a pavement region of the bridge portion 22. The bridge portion 22 is received by the abutment 24 so as to be able to expand and contract in the traveling direction of the vehicle.
[0021]
1 and 2 show a plane and a cross section, respectively, of a road being repaired. For this reason, in FIGS. 1 and 2, a part of the existing pavement of the earthwork portion 20 and the bridge portion 22 is removed, and a new pavement material is disposed at the removed portion.
[0022]
The existing pavement of the earthwork section 20 extends to the back of the abutment 24 (that is, the surface on the side opposite to the bridge), and a slab 28 made of reinforced concrete formed on the earth and sand 26 of the earthwork section 20, A surface layer 30 of asphalt paved over the plate 28 to form a road surface.
[0023]
On the other hand, the existing pavement of the bridge portion 22 extends from the abutment 24 on the rib portion 32 extending in the longitudinal direction of the bridge portion 22 toward the abutment or pier on the opposite side, and is integrated with the rib portion 32. And a floor slab 34 made of reinforced concrete, and an asphalt surface layer 36 laid on the floor slab 34 to form a road surface. The bridge portion 22 is supported by the abutment 24 at the rib portion 32, and the end of the floor slab 34 is placed on the abutment 24.
[0024]
In the road 10 as described above, first, at least a portion of the existing pavement from the portion on the abutment 24 of the existing pavement on the bridge portion 22 side to the existing pavement portion on the earthwork portion 20 side extends over a predetermined depth range from the road surface. Removed. Thereby, the earth and sand 26 of the earthwork part 20 is exposed to the pavement removal area 38 from which the pavement has been removed.
[0025]
The existing pavement on the earthworking section 20 side is removed so that the reinforcing steel therein does not remain in the pavement removal area 38. On the other hand, the existing pavement on the bridge portion 22 side is removed such that at least a part of the reinforcing bar therein remains in the pavement removal area 38. The bridge 22 may be removed so as to leave the lower part of the existing pavement, or the upper part of the rib 32 may be partially removed. When the upper part of the abutment 24 forms an existing pavement following the existing pavement on the bridge portion 22 side, the upper part of the abutment 24 is also removed.
[0026]
Next, the earth and sand 26 of the earthworking section 20 are embanked to consolidate the earth and sand 26. When the pavement removal area 38 of the earthworking section 20 does not have a predetermined depth dimension, a part of the earth and sand 26 is removed. When the existing pavement of the earthworking section 20 has no floor slab, the earth and sand 26 is removed over a predetermined depth range. In any case, the earth and sand 26 of the earthworking section 20 is compacted by compaction and is maintained at a predetermined height level.
[0027]
Until the above operation is completed, a plurality of first PCa plates (that is, first precast reinforced concrete plates) 40 having a rectangular planar shape are prepared.
[0028]
Each first PCa plate 40 includes a base region 42 in the shape of a rectangular plate, and a plate-shaped protrusion region 44 projecting from one end of the base region 42 to one side in the thickness direction of the base region 42. , L-shaped cross section. Each of the first PCa plates 40 has a thickness dimension on the protruding region 44 side substantially equal to that of the existing slab floor 28 on the earthworking portion 20 side.
[0029]
Such a first PCa plate 40 can be manufactured using a mold having an inverted L-shaped bottom surface. That is, the first PCa plate 40 shown in FIG. 2 can be manufactured using a mold having a space in which the shape is inverted. In the first PCa plate 40 manufactured using such a mold, the surface in contact with the mold becomes a smooth surface. The reinforcing bar 51 can be arranged on the first PCa plate 40 at the work site.
[0030]
Each of the first PCa plates 40 also includes a plurality of connecting portions 46 (see FIG. 2) for connecting the adjacent first PCa plates 40 to each other, and a plurality of screw holes 48 (see FIG. 2) penetrating in the thickness direction. 3), a height adjusting bolt 50 (see FIG. 3) screwed into each screw hole 48, and a plurality of through holes 52 (see FIG. 2) penetrating in the thickness direction. I have.
[0031]
Each first PCa plate 40 further has a plurality of lateral holes 53 extending from the end surface on the floor slab 28 side of the existing pavement to the end surface on the bridge portion 22 side, and communicates with each lateral hole 53 from the upper surface. A plurality of vertical holes 55 and 57 are provided, and a reinforcing bar 59 is accommodated in each horizontal hole 53. As will be described later, the vertical hole 55 has a size that allows the operator to insert the hand and operate the rebar 51, and the vertical hole 57 is used as a hole into which grout material is injected. The reinforcing bar 59 has a length dimension that does not protrude from the lateral hole 53.
[0032]
While the first PCa plate 40 is being prepared, the horizontal hole 61 corresponding to the horizontal hole 53 of the first PCa plate 40 is formed in the floor slab 28 of the existing pavement by drilling or the like on the end face side of the first PCa plate 40. And one or more vertical holes 63 communicating from the upper surface of the floor slab 28 to the respective horizontal holes 61 are formed. Each of the lateral holes 61 has a length substantially equal to a half of the length of the reinforcing bar 59, has substantially the same diameter as the lateral hole 53, and is located at a height position facing the lateral hole 53. Is formed. As will be described later, the vertical hole 63 is used as a hole into which a grout material is injected.
[0033]
Next, the plurality of first PCa plates 40 are arranged in the pavement removal area 38 so as to be adjacent to the road 10 in the width direction. In the first PCa plate 40, the protruding region 44 faces the existing pavement 54 on the earthworking section 20 side and faces upward, and the end of the base region 42 on the side opposite to the protruding region 44 remains on the bridge portion 22. The existing pavement 56 is placed in the pavement removal area 38 while being placed on the abutment 24. As a result, the first PCa plate 40 is received by the abutment 24 at the end, and the smooth upper surface, that is, the cut portion 58 lower than the protruding region 44 is made the remaining existing pavement 56 side on the bridge portion 22 side.
[0034]
As described above, when the pavement removal area 38 is smaller than the width of the road and a plurality of first PCa plates 40 are used, each first PCa plate 40 is compared with a case where a single first PCa plate is used. Because of their small size and light weight, each first PCa plate 40 can be easily placed in the pavement removal area 38 by a machine such as a crane.
[0035]
Then, the height of each first PCa plate 40 is adjusted, and a part of each reinforcing bar 59 is inserted into the horizontal hole 61 on the floor slab 28 side by using the vertical hole 55, and further, the adjacent first PCa plate 40 is used. 40 are connected at a connecting portion 46.
[0036]
The height adjustment is performed by disposing a reaction plate 60 such as an iron plate for each bolt 50 on the compacted earth and sand 26 and adjusting the screwing amount of the bolt 50 into the screw hole 48. The connection of the adjacent first PCa plates 40 is performed by bolts and nuts (not shown). Thereby, the adjacent first PCa plates 40 are adjusted to the same height condition with respect to the remaining existing pavement.
[0037]
Next, the backfill material 62 is injected into the lower gap 64 (see FIG. 3) of the first PCa plate 40 using the through hole 52, and the grout material is used using the vertical holes 57 and 63. It is injected into the lateral holes 53 and 61. As a result, the first PCa plate 40 is coupled to the earth and sand 26 thereunder, and the floor slab 28 and the first PCa plate 40 are coupled. The through hole 52 is closed by the backfill material, and the holes 53, 55, 57, 61, 63 are closed by the grout material.
[0038]
However, the through hole 52 may be left without being closed by the backfill material, and may be made available again when the backfill material is re-injected at a later date.
[0039]
By the time the above operation is completed, a plurality of plate-shaped second PCa plates (that is, second precast reinforced concrete plates) 66 are prepared. Each second PCa plate 66 corresponds to the first PCa plate 40 and has the same shape as the space above the corresponding cut portion 58 of the first PCa plate 40. Each second PCa plate 66 also has a plurality of connecting portions 68 (see FIG. 2) for connecting adjacent second PCa plates 66.
[0040]
Next, the plurality of second PCa plates 66 are arranged on the cut portions 58 of the corresponding first PCa plate 40 such that the end surfaces on the protruding region 44 side are spaced from the protruding region 44. You. As a result, the plurality of second PCa plates 66 are arranged in the width direction of the road 10. Each second PCA plate 66 is also smaller and lighter than the case where a single second PCa plate is used, so that each second PCa plate 66 can be easily arranged by a machine such as a crane. it can.
[0041]
When the cut portion 58 of the first PCa plate 40 is not smooth, a sheet made of a synthetic resin is placed on the cut portion 58 of each first PCa plate 40, and the second PCa plate 66 is placed on the sheet. Is preferred. By doing so, the second PCa plate 66 can be easily moved with respect to the first PCa plate 40.
[0042]
Next, the adjacent second PCa plates 66 are connected by bolts and nuts at the connecting members 68, and the reinforcing bar of each second PCa plate 66 is connected to the reinforcing bar of the remaining existing pavement 56 on the bridge portion 22 side. You.
[0043]
Next, a formwork that forms a space between the second PCa 66 and the remaining existing pavement 56 on the bridge portion 22 side is arranged, and concrete is poured into the formwork. In order to shorten the repair period, it is preferable that concrete uses a quick-setting cement which solidifies rapidly. Thus, the second PCa plate 66 and the remaining existing pavement 56 on the bridge portion 22 side are joined together with the fact that the reinforcing bar of the second PCa 66 and the reinforcing bar of the remaining existing pavement 56 are connected.
[0044]
When the existing pavement on the bridge portion 22 side, particularly the floor slab 34 is removed so as to leave the lower part thereof, the lower part of the remaining floor slab 34 may be used as a part of the formwork.
[0045]
As shown in FIG. 4, each of the first PCa plates 40 and each of the second PCa plates 66 further include protrusions 70 and 72 forming seams of the first and second PCa plates 40 and 66, and A plurality of anchors 76 and 78 to which the pavement joint 74 disposed at the seam is connected are provided on the sides of the surfaces facing each other.
[0046]
The anchors 76 and 78 are connected to mounting jigs 80 and 82 embedded in the corresponding PCa plates 40 and 66, respectively, and project from the upper surface of the corresponding PCa plate. The pavement joint 74 is a commercially available known expansion joint, and is attached to the anchors 76 and 78 at an appropriate time. Thus, the first PCa plate 40 and the second PCa plate 66 are elastically connected by the pavement joint 74.
[0047]
If there is a gap between each first PCa plate 40 and the floor slab 28 of the remaining existing pavement 54 on the earthworking section 20 side, a joint material such as mortar is injected into the gap. This operation is performed at an appropriate time after the backfill material 62 has been injected below the first PCa plate 40. Thereby, the first PCa plate 40 and the floor slab 28 remaining on the earthworking section 20 side are joined.
[0048]
Next, the surface layers 84 and 86 are formed on the first and second PCa plates 40 and 66 by asphalt pavement to the same height position as the remaining existing pavements 54 and 56, and the surface layer 84 and the surface layer 30 of the remaining existing pavement 54 are formed. And between the surface layer 86 and the surface layer 36 of the remaining existing pavement 56 are jointed filler materials 88 and 90 such as mortar, respectively.
[0049]
In the road 10 repaired as described above, the first PCa plate 40 acts as a stepping plate because its end is hung on the abutment 24. Therefore, even if the earth and sand 26 thereunder sink, the abutment 24 is not used. Does not change, and a step is prevented from occurring between the pavement on the abutment 24 side and the pavement on the earthworking section 20 side.
[0050]
Further, since the second PCa plate 66 is connected to the floor slab 34 on the bridge section 22 side, it acts as an extended floor slab on the bridge section 22 side. For this reason, the second PCa plate 66 is connected to the first PCa plate 40 or the remaining existing pavement 54 on the earthworking section 20 side, in combination with the fact that both PCa plates 40 and 66 are not made of so-called cast-in-place concrete. There is no risk of engagement, and it can be displaced with respect to the first PCa plate 40 and the remaining existing pavement 54 on the bridge portion 22 side with respect to the remaining existing pavement 54 on the earthwork portion 20 side.
[0051]
Further, the seam between the pavement on the earthwork section 20 side and the pavement on the bridge section 22 side is located on the earthwork section 20 side. For this reason, the vibration and noise caused by the collision of the traveling vehicle with the location where the pavement joint 74 is located, that is, the seam, are absorbed by the earth and sand 26 on the earthworking section 20 side and are small.
[0052]
Instead of forming the joint where the joint 74 is formed by the protrusions 70 and 72 of the first and second PCa plates 40 and 66, the joint has an L-shaped cross-sectional shape as shown in FIG. The first and second PCa plates 40 and 66 may be formed so as to protrude by using long seam fittings 92 and 94 arranged on the first and second PCa plates 40 and 66, respectively. Further, the reinforcing bar of the first PCa plate 40 and the reinforcing bar of the floor slab 28 on the earthworking section 20 side may be connected.
[0053]
It is preferable that the above-mentioned repair be performed for each vertical line or each lane. That way, the road can be repaired without having to completely block the road.
[0054]
The present invention is not limited to the above embodiment. The present invention can be variously modified without departing from the gist thereof.
[Brief description of the drawings]
FIG. 1 is a plan view of a road for explaining a repair method according to the present invention, and is a plan view during repair.
FIG. 2 is a sectional view taken along line 2-2 in FIG.
FIG. 3 is a sectional view showing an embodiment of a height adjusting jig.
FIG. 4 is an enlarged view showing one embodiment of the vicinity of a joint indicated by reference numeral 4 in FIG.
FIG. 5 is an enlarged view showing another embodiment near the seam.
[Explanation of symbols]
Reference Signs List 10 Road to be repaired 20 Earthwork section 22 Bridge section 24 Abutment 26 Earth and sand 28, 34 Floor slab 30, 36 Surface layer 32 Rib section 38 Pavement removal area 40 First PCa version 42 Base area 44 Projection area 46, 68 Connection section 48 Screw hole 50 Bolt 52 for height adjustment Through hole 54 for filling backfill material Remaining existing pavement 56 on the earthwork side Remaining existing pavement 58 on the bridge side Cut section 62 of first PCa plate 62 Backfill material 66 Second PCa version 70,72 Projection 74 Pavement joint 76,78 Anchor 80,82 Mounting jig 84,86 Surface layer 88,90 Joint material 92,94 Joint fitting

Claims (9)

A method of repairing an abutment and a road in the vicinity thereof,
A first step of removing the existing pavement from at least a part on the abutment to a part on the earthwork side;
A first PCa plate having an L-shaped cross-sectional shape having a protruding region at one end, in a state in which the protruding region is facing the remaining existing pavement side on the earthwork portion side and is facing upward; A second step of disposing the existing pavement in a state where the other end of the pavement is directly or indirectly received by the abutment;
A third step of disposing a plate-shaped second PCa plate on the first PCa plate closer to the bridge portion than the protruding region. The repair method according to claim 1, wherein the first step includes removing at least a part of an existing pavement of the bridge portion. The repair according to claim 1 or 2, wherein the second step includes, after adjusting the height of the first PCa plate, injecting a backfill material into a lower side of the first PCa plate. Method. 4. The method according to claim 1, wherein the third step includes arranging the second PCa plate in a state in which the second PCa plate is in contact with the first PCa plate closer to a bridge portion than the projecting region. 5. Repair method. The third step includes disposing a resin sheet on the first PCa plate closer to the bridge portion than the projecting region, and disposing the second PCa plate on the sheet. The repair method according to claim 1, 2 or 3. The method according to any one of claims 1 to 5, further comprising a fourth step of connecting the second PCa plate to the remaining existing pavement on the bridge side at an appropriate time after the third step. Repair method described in. The repair method according to claim 6, wherein the fourth step includes joining the reinforcing bar of the second PCa plate and the reinforcing bar of the existing pavement on the bridge portion side, and placing concrete in the joining portion. 8. The method according to claim 1, further comprising a fifth step of connecting the projecting area of the first PCa plate and the second PCa plate with a joint at an appropriate time after the third step. The repair method according to any one of the preceding claims. 9. The method according to claim 1, further comprising a sixth step of combining the first PCa plate and the remaining existing pavement on the earthworking section side at an appropriate time after the third step. 9. Repair method described in.

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