JP2000345502A - Boundary jointing structure for road with enlarged width and method for jointing boundary - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of a level difference due to the subsidence of ground at the boundary by filling a predetermined number of block bodies between an excavated surface and a road structure with an enlarged width, laying crushed stone on the top of block bodies, and paving the top surface with paving materials. SOLUTION: Piles 2 are driven into a sloped surface 1 at the valley side closely to an existing road 8, lateral girders 3 are erected between the upper portions of the piles 2b thereby constructing supporting main bodies 17a, and a road shoulder portion of the existing road 8 is excavated. And one or two or more block bodies 12 each placed by filling a filler after assembling together precast concrete block pieces 14 to 16 to a cross section shaped to a reversed trapezoid are assembled in a space between the supporting body 17 and the excavated surface 11. After filling, a floor slab 4 is installed to the top of the supporting body 17, crushed stone 13 is laid on the block body 12, and the surface layer is paved to one united body with paving materials thereby building the road with enlarged width. Without backfilling with sediment, concrete is completely filled thereby ground settlement at the boundary jointing portion B can be prevented, the work can be done closely to the existing road 8, the period of time for the work can be shortened and the construction cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining structure and a joining method of a boundary portion between an existing road and a widened road structure constructed adjacent to the existing road when widening the existing road. is there.

[0002]

2. Description of the Related Art When widening work is performed in a state where an existing road existing on a slope can be used, for example, as shown in FIG. The widening road structure A is constructed independently of the above to realize widening. In the widened road structure A, a stake 2 is cast on the valley-side slope 1 of the existing road 8, and a girder 3 is bridged between upper portions of the stake 2 to construct a support 17. Floor slab 4
Is installed and constructed.

[0003] With regard to the boundary joining between the existing road 8 and the ground thereof and the widened road structure A, conventionally, the shoulder of the existing road 8 and the valley-side slope 1 following it are excavated, and then excavated. Between the excavated surface 11 and the widened road structure A, a retaining wall 7 for retaining the earth is constructed from cast-in-place concrete, and the space between the back surface of the retaining wall 7 and the excavated surface 11 is crushed by earth and sand or crushed rock. After that, the surface layer of the backfill portion 6, the upper surface of the retaining wall 7, and the floor slab 4 of the widened road structure A are integrally paved with a paving material 5 such as asphalt to widen the width. Road.

Here, when the widening road structure A is to be constructed at the site in a simple and early manner, the above-mentioned piles 2 are required.
Are composed of a foundation pile 2a and an upper pile 2b, respectively. Then, the girder 3 is laid in advance between the upper piles 2b and the support body 17 is
a, and each foundation pile 2a is driven into a predetermined position. Thereafter, the support body 17a is lifted,
The pile head 2c of the foundation pile 2a corresponding to the lower end of each upper pile 2b
And the pile head 2c of the foundation pile 2a and the lower end of the upper pile 2b are joined by welding. The support body 1
In some cases, the floor slab 4 is also installed in advance in the area 7a.

At this time, since the pile head 2c of the foundation pile 2a located on the existing road 8 side is buried, the foundation pile 2a
Is excavated in the vicinity of the pile head 2c, and an operator enters the excavation part 22 to perform welding work between the pile head 2c of the foundation pile 2a and the lower end of the upper pile 2b, and After joining with the pile 2b, the excavated portion 22, that is, the joint of the pile and the periphery of the pile 2 in the vicinity thereof are backfilled with earth and sand, and further compaction is performed.

[0006]

However, in the above-described boundary joining, a work space is required for a reinforcing work for forming the concrete retaining wall 7, a formwork work, and the like, so that an excavated area is reduced. As a result, the cost required for excavation work increases, and a large amount of earth and sand must be transported and disposed of. In addition, the construction period of road widening work will be prolonged.

Further, since the concrete retaining wall 7 is formed of cast-in-place concrete, there is also a problem that the construction period required for curing the reinforcing steel bar, the formwork, and the concrete becomes large, and the service to road traffic is delayed. Since the concrete retaining wall 7 is self-supporting, reinforcement of reinforcing bars and the like are required. Furthermore, the back of the concrete retaining wall 7 (existing road 8
Side) is backfilled with sand or crushed stone, but as mentioned above, the excavation area is wide and backfilled with earth and sand, etc.
, The ground at the joint B becomes soft, and the backfilling portion 6 sinks down with the passage of the vehicle after the completion of the widening work, that is, due to the load of the passing vehicle. At this time, the widened road portion composed of the floor slab 4 does not sink much because it is firmly supported by the piles 2, so that a remarkable step 10 and a crack 9 are generated at the boundary joint B during use for many years. . In general, the boundary junction B is often located near the center in the width direction of the road, which is likely to cause a problem in vehicle traffic.

In addition, during an earthquake, the widened road structure A, which is an independent structure, is likely to be displaced horizontally relative to the existing road, so that a crack 9 is formed between the end surface of the floor slab 4 and the concrete retaining wall 7. There is also a problem that the problem easily occurs. When the pile head 2c is buried, the periphery of the pile is once excavated and joined, and then backfilled with earth and sand. Around) becomes soft. In addition, the backfill work of the lower side of the digit 3 is performed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems. When widening a road on a slope, the boundary joining work of the widened road is facilitated, and the settlement at the boundary joining portion is performed. It is an object of the present invention to provide a boundary joining structure and a method of joining a widened road, which can suppress the occurrence of a road.

[0010]

In order to solve the above-mentioned problems, the present invention as set forth in claim 1 of the present invention provides a stake and a girder constructed adjacent to a valley side of an existing road existing on a slope. A widened road structure in which the floor slab is supported on a support made of
A boundary joining structure between an excavated surface formed by excavating a valley-side slope of the existing road, wherein a space between the widened road structure and the excavated surface is filled and a valley is formed by the support. The present invention provides a boundary joining structure for a widened road, comprising one or more block bodies whose movement to the side is restricted, and a pavement material laid above the block bodies. It is.

[0011] Next, the invention according to claim 2 is a widened road structure which is constructed adjacent to the valley side of an existing road which has been established on a slope and in which a floor slab is supported by a support comprising a pile and a girder. And an excavated surface formed by excavating a valley-side slope of the existing road, wherein cast-in-place concrete filled in a space between the widened road structure and the excavated surface And a pavement material laid on the top of the cast-in-place concrete.

Next, according to a third aspect of the present invention, in the configuration according to the first or second aspect, each of the piles constituting the support is a foundation pile which is cast on the ground, and An upper pile having a lower end joined to a pile head of a foundation pile and a girder spanned over the pile. Cast-in-place concrete is attached to the joint and the pile peripheral surface in the vicinity thereof.

[0013] Next, the invention described in claim 4 constructs a widened road structure in which a floor slab is supported by a support consisting of a pile and a girder adjacent to a valley side of an existing road which is already installed on a slope. In doing so, in the boundary joining method for joining the above-mentioned existing road and its ground to the above-mentioned widened road structure, the valley side slope of the existing road is excavated to form an excavated surface, and the excavated surface and the widened road structure are supported. After installing one or two or more block bodies having a shape that can be fitted into the gap in the gap with the body,
Another object of the present invention is to provide a boundary joining method for a widened road, characterized by laying a pavement material on the upper side of the block body.

Next, according to a fifth aspect of the present invention, there is provided a widened road structure in which a floor slab is supported on a support made of piles and girders adjacent to the valley side of an existing road which has been established on a slope. In doing so, in the boundary joining method for joining the above-mentioned existing road and its ground to the above-mentioned widened road structure, the valley side slope of the existing road is excavated to form an excavated surface, and the excavated surface and the widened road structure are supported. At least one block or two or more blocks having a shape that can be fitted into the gap are installed in the gap with the body until the upper surface of the block is higher than the lower end of the existing road side girder in the support. A widened road boundary, wherein a filler is poured into a groove formed by the installed block body, the support, and the excavated surface to join the ground of the existing road to the widened road structure. A joining method is provided.

[0015] Next, the invention according to claim 6 constructs a widened road structure in which a floor slab is supported on a support made of piles and girders adjacent to a valley side of an existing road which is already installed on a slope. In doing so, in the boundary joining method for joining the existing road and its ground to the widened road structure, the valley-side slope of the existing road is excavated to form an excavated surface, and the existing road side is formed along the existing road. After closing the space between the girder and the ground between the piles lined up with the formwork, the formwork, the support,
The present invention also provides a method for joining the boundary of a widened road, wherein concrete is poured into a groove formed by the excavated surface to join the ground of an existing road to a widened road structure.

According to a seventh aspect of the present invention, in accordance with the fourth aspect of the present invention, each of the piles constituting the support is a foundation pile which is cast on the ground. And an upper pile whose lower end is joined to the pile head of the foundation pile and a girder is laid horizontally. Of the above-mentioned piles, the foundation pile pile head is buried. Driving into the ground, excavating the ground around the pile head of the foundation pile, welding the lower end of the upper pile to the pile head of the foundation pile, joining it, and then backfilling the excavation around the pile. The backfilling is performed by casting and filling cast-in-place concrete in the excavated area around the pile.

According to the present invention, it is unnecessary to bury backfill such as earth and sand in the joint boundary, and the filler such as concrete fills the entire space of the gap between the joints. As a result, the ground at the boundary joint becomes solid. At this time, when the block body is filled, the block body is supported by the support so as not to move to the valley side, and also serves as a retaining wall of the earth retaining wall.

Further, since the block body is merely installed and filled in the gap between the excavated surface and the support of the widened road structure, no formwork or the like is required. It is not necessary to widen the gap for the purpose. That is, the amount of excavation is reduced, and the amount of concrete used for the boundary joint is reduced. In the invention described in claim 5, concrete is cast on site. However, since the block body, the girder part of the support, and the excavated surface also serve as the formwork, the formwork work only for concrete placement is performed. Is unnecessary.

Also, in the invention described in claim 6, concrete is cast on site, but the girder portion extending in the depth direction of the support also serves as the formwork. What is necessary is just to install and close the mold only in the narrow space. Further, since the cast concrete is restrained by the support so as not to move to the valley side, it is not necessary to perform a reinforcing work on the cast-in-place concrete portion unlike a conventional retaining wall.

It is preferable that crushed stones be provided on the upper surface of the block body. This is because even if the widened road structure swings due to an earthquake or the like and a crack is formed between the widened road structure and the block body, the crushed stone fills the crack. In the second, fifth, and sixth aspects of the present invention, the arrangement of the crushed stone indicates the upper surface of the cast concrete.

Further, when a pile is composed of a foundation pile and an upper pile, if concrete is applied around the joint, the rigidity of the joint is improved. In particular, the invention of the present application fills a gap or the like in the boundary joint portion with a block or the like and supports the movement of the block or the like to the valley side with a support.
A lateral load from a block body or the like may be applied to the support. Therefore, improving the rigidity of the joint between the foundation pile and the upper pile as described above is particularly effective for the present invention. In addition, the pile head of the foundation pile of the existing road side pile which receives a load directly from a block body or the like is generally buried in the ground.

Further, according to the present invention, the work of backfilling the excavated portion around the joint needs to be carried out under the girder, but when backfilling with cast concrete, Since the installation can be performed by inserting the casting hose into the excavation section, the backfilling operation is facilitated. In addition, compaction is not required, and the top surface of the backfilled portion can be set flat.

[0023]

Next, a first embodiment of the present invention will be described with reference to the drawings. The same members as those in the conventional example will be described with the same reference numerals. FIG.
1 is a schematic sectional view showing a widened road structure A and a widened road boundary junction B. FIG.

A widened road structure A is constructed adjacent to the valley side of the existing road 8 existing on the sloping land, side by side with the existing road 8 on the valley side slope 1. The widened road structure A is constructed independently of the existing road 8 in order to allow as much traffic as possible on the existing road 8 during widening work. That is, the widened road structure A is provided with a support 1 by a pile 2 which is driven along the existing road 8 on the valley side slope 1 and a plurality of girders 3 bridged between the piles 2.
7 is constructed, and the floor slab 4
Is formed and constructed.

Here, the pile 2 of the support 17 is composed of a foundation pile 2a to be driven into the ground and an upper pile 2b joined to the pile head 2c of the foundation pile 2a. Further, the beam 3 is previously laid between the upper piles 2b and the support body 17 is
a is constructed. Then, after each foundation pile 2a is driven into a predetermined position, the support body 17a is lifted, and the lower end of each upper pile 2b is placed on the corresponding pile head 2c of the foundation pile 2a. The support body 17 is constructed by welding the head 2c and the lower end of the upper pile 2b by welding. The floor slab 4 may be installed in advance on the support body 17a.

In this embodiment, since it is not necessary to construct a retaining wall using a form material at the boundary joint B, the widened road structure A is constructed closer to the existing road 8 than before. I do. When the widened road structure A having the above configuration is constructed, when the support 17 is formed, the shoulder of the existing road 8 is excavated, and the excavation surface 11 (slope) is formed on the valley-side slope of the existing road 8. After the formation, the block body 12 is lowered from above and installed between the support body 17 and the excavation surface 11, so that the space between the support body 17 and the excavation surface 11 is filled with the block body 12.

Here, the digging surface side of the support 17 forms a substantially vertical plane, and the lower surface of the digging surface 11 is
Is formed, the space between the support 17 and the excavation surface 11 has an inverted trapezoidal cross section. Therefore, the block body 12 is processed into an inverted trapezoidal cross-sectional shape, and the size thereof is
The size is such that it can be fitted into the space between the excavation surface 11 and the excavation surface 11. The adjustment may be performed by the excavation.

In the present embodiment, as shown in FIG. 2, the block 12 is divided into a plurality of block pieces 14, 15, and 16, and the respective block pieces 14, 15, and Reference numeral 16 constitutes a block body according to the present invention. In this embodiment, an example is shown in which the image is divided into three steps in the height direction and also divided in the depth direction, but the invention is not limited to this.

Note that each of the block pieces 14, 15, 16 is
It is preferable that each has a height of 30 to 50 cm and a division length in the depth direction of about 50 to 100 cm from the viewpoint of transportation and installation work. However, it is necessary to have a size that can be supported by the stakes 2 and the girders 3 of the support 17. In addition, each block piece 14, 1
The contact surface between 5 and 16 may be filled with a filler to increase the degree of joining. Further, the block body 12 and the excavation surface 11
Even if there is a gap between them, backfilling with a small amount of earth and sand or a filler (grout material) is sufficient, so that the work is reduced and at the same time it does not cause ground subsidence.

The installed block body 12 is used for supporting 1
Since it is only dropped between the excavation surface 7 and the excavation surface 11, there is no need for a formwork for construction as in the case of the conventional cast-in-place concrete retaining wall. The block body 12 receives the earth pressure from the excavation surface 11, but the block body 12 is supported by the support body 17, especially the pile 2, and the movement to the valley side is restrained. The applied earth pressure is transmitted to and supported by the support 17 as it is, so that the block body 12 also functions as an earth retaining wall.

The division of the block body 12 is not limited to the height direction and the depth direction, but may be divided also in the width direction. When the embedding of the block body 12 is completed,
After the floor slab 4 is attached to the upper part of the support 17 and the crushed stone 13 as a pavement material is laid on the block body 12, the surface layers of the floor slab 4 and the block body 12 are integrated with a pavement material such as asphalt. The road is widened by paving at 5. When the upper surface of the block body 12 is substantially the same as the upper surface of the floor slab 4 or the like, the crushed stone 13 may be omitted.

In the above-described method for joining the boundary of a widened road, the widened road structure A is independently constructed so that the existing road 8 can be used for traffic as much as possible during widening work. It can be constructed close to the road 8 and the excavation portion on the valley-side slope 1 can be reduced. In addition, since a retaining wall (block body 12) is installed, no formwork or reinforcing work is required. Earth retaining is achieved only by dropping the block body 12.

As described above, when the boundary joining method of the present invention is used, the construction is simple and the cost can be reduced.
The construction period for widening work can also be shortened. In addition, in the boundary joining structure of the widened road constructed as described above, a portion where the existing road 8 is excavated and a space between the valley-side slope following the existing road 8 and the widened road structure A are provided with ground. It is unnecessary or almost unnecessary to backfill earth and sand, which is the cause of
The concrete is completely filled. Therefore, subsidence at the boundary joint B is almost prevented. On the other hand, the ground of the existing road 8 has already been compressed by the vehicle load for a long time, and there is almost no settlement after the widening work.

Therefore, almost no land subsidence occurs over the widened road portion at the position of the floor slab 4, the boundary junction B of the widened roads, and the existing road 8, and the boundary as in the conventional structure does not occur. The occurrence of a significant step at the joint B is prevented. Further, in the joint structure of the present embodiment, since the lower surface of the end of the floor slab 4 is filled with the block body 7 fitted therein, even if the widened road structure A swings horizontally in the event of an earthquake. The cracks generated at the end of the floor slab 4 do not penetrate into the lower structure position, and the cracks generated by the roadbed crushed stone 13 at the upper part of the block body 12 are smoothly filled, so that the crushed material generated by the earthquake falls. Also, it is possible to prevent the wheel of the car from falling into the crack or stepping on the foot.

Next, a second embodiment of the present invention will be described. In addition, about the member etc. similar to the said embodiment, the same code | symbol is attached | subjected and the detail is abbreviate | omitted. The basic structure of the widened road structure A and the formation of the excavated surface 11 and the boundary joining structure of the present embodiment are the same as those of the first embodiment, but as shown in FIG. Only 14 were installed.

That is, the excavated surface 1 of the support 17
The block piece 14 is installed so that the upper surface of the block body is located at a position higher than the lower end of the position of the spar 3 extending in the depth direction along 1 and the spar 3 and the ground are vertically moved by the block piece 14. Close the gap. That is, the block piece 14 only needs to have a height sufficient to close the gap between the beam 3 and the ground. As the block piece 14, a concrete block, a precast molded product of soil cement, a styrofoam molded product, or the like can be appropriately used.

When the installation of the block pieces 14 is completed,
A filler such as concrete is poured into the groove 20 formed by the block piece 14, the girder 3, and the excavation surface 11, and a block is constructed on site. As described above, a block that works as a retaining wall by casting a filler at the site is created. However, since the block piece 14 and the like also serve as a mold, separate mold work is not required. .

Prior to the placement of the filler, the groove 20
Reinforcement and installation of anchors may be performed inside. However, the concrete that was cast was not supported by the support 17
It is not necessary to perform the work of arranging the reinforcing bars and anchors. In addition, a hardening material such as concrete and soil cement can be used as the filler.

When the poured filler hardens to form a block, as in the first embodiment, the floor slab 4 is mounted on the support 17 and the roadbed crushed stone 13 is laid on the block. Thereafter, the floor slab 4 and the surface layer of the block are paved together to form a widened road. In addition, roadbed crushed stone 1
Instead of laying 3, the cast-in-place concrete may be laid to the position where the roadbed crushed stone 13 is laid.

In this embodiment, the precast block piece 1 is provided only at the lowermost stage which is sufficient to close the gap between the girder 3 and the ground.
4, the portions corresponding to the middle and upper block pieces 15 and 16 in the first embodiment are formed by filling with cast-in-place concrete or the like. Only the block piece 14 of FIG. In addition, by casting concrete or the like, the excavated portion can be completely filled with concrete or the like.

In this embodiment, concrete is cast between the widened road structure A and the excavation surface 11 by casting concrete at the site. There may be a gap between the first and the second. That is, the shape accuracy of the block pieces 14 may be lower than in the first embodiment. Other configurations, operations, and effects are the same as those of the first embodiment.

Next, a third embodiment will be described with reference to the drawings. In addition, about the member similar to each said embodiment, the same code | symbol is attached | subjected and the detail is abbreviate | omitted.
The basic configuration for forming the widened road structure A and the excavated surface 11 of the present embodiment is the same as that of the first embodiment,
As shown in FIGS. 4 and 5, a block body is not used.

That is, the excavation surface 1 of the support 17
Between the piles arranged in the depth direction along the excavation surface 11 so as to close the space below the position of the girder 3 extending in the depth direction along 1, that is, the vertical space between the girder 3 and the ground. The mold 21 is attached. The formwork 21 only needs to be high enough to close the gap between the spar 3 and the ground. When the installation of the formwork 21 is completed, the cast-in-place concrete 24 is poured into the groove formed by the formwork 21, the girder 3, and the excavation surface 11, and a block is constructed with the concrete 24.

As described above, a block that works as a retaining wall is created by casting concrete 24 on site, but since the formwork 21 is installed only in the narrow space between the girder 3 and the ground, the formwork is formed. The installation work of 21 is small. In addition,
In the upper part of the mold 21, the girder 3 and the upper pile 2 b extending in the depth direction also serve as the mold 21. Prior to the placement of the concrete 24, reinforcements and anchors may be installed in the grooves. However, since the movement of the cast concrete 24 on the valley side is constrained by the support 17, it is not necessary to arrange the reinforcing bars and the anchors.

When the cast concrete 24 has hardened to form a block, the floor slab 4 is mounted on the support 17 and the crushed roadbed stone 13 is laid on the block, as in the first embodiment. Thereafter, the floor slab 4 and the surface layer of the block are paved together to form a widened road. Instead of laying the roadbed crushed stone 13, cast-in-place concrete may be cast to a position where the roadbed crushed stone 13 is laid. FIG. 4 shows an example in which the cast-in-place concrete 24 is laid to the position where the crushed roadbed stone 13 is laid.

In the present embodiment, the formwork 21 is installed only in the lowermost portion that is sufficient to close the gap between the girder 3 and the ground, and the cast-in-place concrete 24 is poured into the groove to form a block. The transport of the block, which is an object, becomes unnecessary.
Also, by placing the concrete 24, the excavated portion can be completely filled with the concrete.

Further, since the cast concrete 24 is applied so as to bite into the support 17, even if an earthquake is input, the support 17 and the cast concrete 24 are integrally displaced in the horizontal direction. So that at least the support 1
Cracks hardly occur between the concrete 7 and the cast concrete 24. Here, as described above, for the purpose of, for example, constructing the widened road structure A at the site at an early stage, the piles 2 of the support body 17 are respectively laid on the foundation piles 2a.
And an upper pile 2b joined to a pile head 2c of the foundation pile 2a
It is composed of At this time, since the pile head 2c of the foundation pile 2a of the pile 2 located on the existing road side, that is, the pile 2 receiving the horizontal load from the cast concrete 24 is buried, Excavated,
After the worker enters the excavation part 22 and joins the lower end of the upper pile 2b to the pile head 2c of the foundation pile 2a by welding, the excavation part 22, that is, the joint part and the periphery of the pile in the vicinity thereof are backfilled. Work is required.

In this embodiment, the excavation part 2 around the pile 2
The backfilling of No. 2 is performed by putting a casting hose into the excavated portion 22 and casting concrete 23 into the excavated portion 22. Since only the concrete, which is a fluid, is poured through the hose in this way, the girder 3
Even if there is, not only the backfill work becomes easy, but also the rigidity of the joint is improved. In the present embodiment, the pile 2 on the existing road 8 side receives a horizontal load from the cast concrete 24, but the rigidity of the joint between the foundation pile 2a and the upper pile 2b in the pile 2 is easily improved. Becomes possible.

Also, since the excavated portion 22 on the two sides of the pile is backfilled by pouring concrete which is a fluid, the upper surface after backfilling can be easily flattened.
Installation becomes easy. The excavation part 2 around the pile 2
Backfilling 2 with concrete 23 can also be applied in the first and second embodiments.

[0050]

The following is a simulation result of a comparison between the case where widening work is performed by employing the boundary joining described in each of the above embodiments according to the present invention and the case where widening work is performed by the above-described conventional method. (1) Reduction of excavation amount Compared with the excavation amount per 100 m of road depth, the conventional method requires excavation of 500 m ³ , but according to the present invention, excavation of 250 m ³ is sufficient, and the excavation amount is reduced by 50%. Is expected. (2) Regarding shortening the construction period, even if a block is constructed of cast-in-place concrete by adopting the second embodiment, the concrete curing period per 100 m of road depth is only about 10 days, and the conventional concrete retaining wall construction Compared with the method of performing backfilling of the excavated part, the period of formwork construction and backfilling work of the excavated part can be reduced.

[0051]

As described above, when the present invention is employed, the land subsidence due to the vehicle load at the junction of the widened road is suppressed, and as a result, the step at the road boundary is prevented from being generated. is there. In addition, there is an effect that generation of cracks at the boundary joint can be effectively prevented.

In addition to the effects described above, the present invention has an effect that the construction period of road widening work can be shortened.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a boundary joining structure of a widened road according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a block body according to a first embodiment based on the present invention.

FIG. 3 is a diagram for explaining a boundary joining structure of a widened road according to a second embodiment of the present invention.

FIG. 4 is a diagram for explaining a boundary joining structure of a widened road according to a third embodiment of the present invention.

FIG. 5 is a diagram showing a structure near a joint between a foundation pile and an upper pile according to a third embodiment of the present invention, as viewed from the valley side.

FIG. 6 is a view for explaining a conventional method.

[Explanation of symbols]

 A Wide road structure B Boundary joint 1 Slope 2 Pile 2a Foundation pile 2b Upper pile 3 Girder 4 Floor slab 5 Pavement material 8 Existing road 11 Excavated surface 12 Block body 14, 15, 16 Block piece 17 Support body 20 Groove 21 type Frame 22 Drilling part 23 Cast-in-place concrete 24 Cast-in-place concrete

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideki Yoshitake 2-3-2 Uchisaiwaicho, Chiyoda-ku, Tokyo Inside Kawasaki Steel Corporation (72) Keisuke Shioda 2-3-2 Uchisaiwaicho, Chiyoda-ku, Tokyo Kawa F term in Saki Steel Corporation (reference) 2D051 AF03

Claims (7)

[Claims] 1. A widened road structure which is constructed adjacent to a valley side of an existing road existing on a sloping land and in which a floor slab is supported by a support comprising a pile and a girder, and a valley side slope of the existing road. A boundary joining structure between an excavated surface formed by excavation, wherein a space between the widened road structure and the excavated surface is filled and movement to a valley side is restrained by the support. A boundary joining structure for a widened road, comprising one or more blocks and a pavement material laid on an upper side of the blocks. 2. A widened road structure constructed adjacent to a valley side of an existing road existing on a slope and supported by a support made of piles and girders, and a widened road structure, and a valley-side slope of the existing road. A boundary joining structure between an excavated surface formed by excavation, and a cast-in-place concrete filled in a space between the widened road structure and the excavated surface, and laid on an upper side of the cast-in-place concrete And a pavement material to be used. 3. Each of the piles constituting the support is composed of a foundation pile which is cast on the ground, and an upper pile whose lower end is joined to a pile head of the foundation pile and a girder is laterally bridged. For the piles in which the heads of the foundation piles are buried among the piles, cast-in-place concrete is applied to the joints between the foundation piles and the upper piles and the pile peripheral surface in the vicinity thereof. The widened road boundary joining structure according to claim 1 or 2, wherein: 4. When constructing a widened road structure in which a floor slab is supported by a support consisting of a pile and a girder adjacent to a valley side of an existing road that has been established on a slope, the existing road and its ground are connected to each other. In the boundary joining method for joining the widened road structure, a valley-side slope of an existing road is excavated to form an excavated surface, and the excavated surface is fitted into a gap between the excavated surface and a support of the widened road structure. A method for joining a boundary of a widened road, comprising: laying a pavement material on an upper side of a block body after installing one or more block bodies having a shape that can be combined. 5. When constructing a widened road structure in which a floor slab is supported on a support consisting of a pile and a girder adjacent to the valley side of an existing road that has been established on a slope, the existing road and its ground are connected to each other. In the boundary joining method for joining the widened road structure, a valley-side slope of an existing road is excavated to form an excavated surface, and the excavated surface is fitted into a gap between the excavated surface and a support of the widened road structure. One or two or more blocks that can be combined
The block body is installed until the upper surface thereof is higher than the lower end of the girder on the existing road in the support, and a filler is poured into the groove formed by the installed block body, the support, and the excavation surface. And joining the ground of the existing road to the widened road structure. 6. A widened road structure in which a floor slab is supported on a support consisting of a pile and a girder adjacent to a valley side of an existing road that has been established on a slope, and the existing road and its ground are connected to each other. In the boundary joining method for joining the widened road structure, the excavation is performed by excavating a valley-side slope of an existing road, and the girder and the ground between piles arranged along the existing road on the existing road side are formed. After the space between them is closed with a formwork, concrete is poured into the groove formed by the formwork, the support, and the excavated surface to join the ground of the existing road and the widened road structure. Characteristic method of joining the boundaries of widened roads. 7. Each of the piles constituting the support is composed of a foundation pile which is driven into the ground, and an upper pile whose lower end is joined to a pile head of the foundation pile and a girder is laid horizontally. Regarding the connection of piles where the pile head of the foundation pile is buried among the above piles, the foundation pile is driven into the ground, and the ground around the pile head of the foundation pile is excavated. The lower end is welded and joined, and then performed by backfilling the excavated area around the pile, and the backfilling is performed by casting and filling the excavated area around the pile with cast-in-place concrete. The method for joining boundaries of a widened road according to any one of claims 4 to 6, wherein: