JP4700987B2 - Overhangway block and method for constructing overhangway using the block - Google Patents

Description

  The present invention provides a roadway block used for widening the road so that the roadside edge projects downward outside the slope in a road having a descending slope regardless of the presence or absence of structures such as retaining walls, The present invention relates to a construction method of a stretched road using this block. The retaining wall here includes a wall-like structure standing on the edge of the road, such as a side wall of a waterway under the road.

  In the case of roads with slopes where one side or both sides of the roadside edge descends, such as narrow roads in mountains and roads along rivers, when it is necessary to widen the road width due to increased traffic, etc. Overhang concrete blocks are often used. For example, in Patent Document 1, a precast overhanging block provided with a connecting portion on the lower surface is used in order to minimize the traffic interruption associated with the widening work while maximizing the existing retaining wall constructed on the slope. A road widening method is used in which the overhanging block is fixed to the top of the existing retaining wall via a cushioning body such as a rubber pad while a counterweight is provided on the underside of the overhanging road surface side. Proposed.

  More specifically, first, the current road inner portion of the existing retaining wall is excavated, a rubber pad serving as a buffer is laid on the top edge of the existing retaining wall, and the top edge of the existing retaining wall is inserted through this rubber pad, Fix the connecting part of the overhanging block with the anchor bolt. Next, after the counterweight is attached to the lower surface of the end of the projecting block projecting to the current road side with anchor steel, the road surface is laid and paved to complete the widening work.

  On the other hand, these overhanging blocks are used not only for widening roads but also for the purpose of effectively using inclined surfaces such as built-up housing land. For example, in Patent Document 2, it is composed of a block bent in a crank shape when viewed from the side, and a stationary member portion that hits the base of the expansion piece is placed on the upper end of the retaining wall, and is one step lower than the ground surface on the side of the building. An effective use area expansion block that is installed by placing a weight on the maintenance member has been proposed.

  Also in this block, almost the same as the overhanging block above, the space inside the retaining wall is secured by excavating the inner part from the retaining wall, and if necessary for the retaining member of the block placed on the top end of the retaining wall After installing the ground anchor, the widening work is completed by placing a weight and then covering the block with garden soil.

  By the way, although the road side edge has a descending slope, when the structure is not accompanied by a retaining wall or the like, the overhanging block and the effective use area expanding block cannot be used. Therefore, in Patent Document 3, a wall body is newly fixed between piles erected at an appropriate interval along the road on the outside (expansion direction) of an existing slope having a steep slope, and the back side of the wall body ( A widening structure of a road having a haunch shape in which an upper end of a wall body extends outward while embankment is applied to an existing road side) has been proposed. In this widened structure, the block to be assembled at the upper end of the new wall body is a haunch-shaped block, and the pile is installed as close to the existing slope as possible before construction. As a result of being able to reduce the amount of embankment in a short time, it is said that the construction can be rationalized.

JP 2003-119703 A (claims 1 and 2, [0023], FIG. 1) JP-A-8-85952 (Claim 1, FIG. 1 and FIG. 2) JP-A-8-13405 (Claim 1, FIG. 1)

  However, in the blocks described in Patent Documents 1 and 2, since the stability and durability of the completed widened part depend on the strength of the existing retaining wall, the existing retaining wall is aged, Widening of the road is difficult because it is difficult to verify the structural and permanent stability in the field where the retaining wall of the block pile is constructed by empirical methods and the reasonable calculation strength is not satisfied. The plan itself had to be abandoned.

  On the other hand, according to the widening structure described in Patent Document 3, a new wall is constructed in the widened portion, so that the existing slope portion is buried in the new road. There is an advantage that the road can be widened, but in addition to the erection work of piles, a large amount of space between the new wall and the existing slope, Since various operations such as embankment loading are required, there are disadvantages that lead to a long construction period and an increase in construction costs.

  However, in the present invention, it is possible to perform road widening construction that ensures durability and stability regardless of the state of the existing slope, and to reduce traffic restrictions during construction as much as possible, between blocks that are continuously constructed. It is an object of the present invention to provide an overhanging road block that can be easily adjusted in a short and short construction period, and a overhanging road construction method using the block.

  In order to solve the above-mentioned problems, the present invention embeds a standing roadway as an overhanging road block used to widen a road whose roadside edge forms a descending slope in the outward direction of the slope. The one side of the main body in the shape of a flat plate is the overhanging part, the other side is the weight part, and the main body plane side is While a substantially flat surface is formed, on the bottom surface side of the main body, a mounting portion for the cap is provided between the protruding portion and the weight portion, and the bottom surface of the weight portion is below the bottom surface of the mounting portion. The weight portion is formed thick and integrally so as to be positioned, and height adjusting means is provided on the mounting portion and the bottom surface of the weight portion.

In the extended road block of the present invention, widening construction independent of the state of the existing slope is possible by installing the block via the shade cap on the top of the reinforcement pile embedded and standing inside the existing slope However, the overall shape of the overhang road block is roughly flat so that the depth of excavation on the construction road surface is kept shallow, and the thick and integrally formed weight is necessary to generate a tipping resistance moment. In addition, it was made to function as a sufficient counterweight, and the engagement with the existing retaining wall top was achieved by a step portion from the weight portion to the placement portion.

A reinforcing bar can be projected from the bottom surface of the weight portion. Since concrete will be placed on the bottom side of the overhanging road block that has been adjusted to match the level of adjacent blocks, the bar arrangement and the site projecting from the bottom of the weight part When the cast concrete is integrated, the weight of the weight portion as the counterweight can be increased, and a large load when a large vehicle passes through the widened portion can be dealt with.

  The height adjusting means provided on the mounting portion of the overhanging road block and the bottom surface of the weight portion are provided at three locations, two in the short side direction of the mounting portion and one on the bottom surface of the weight portion. However, it is possible to use a three-point support of the top surface and one excavated road surface, and as this adjusting means, one using advancing and retreating of a bolt vertically penetrating from the block plane to the bottom surface is preferably used.

  At the end of the overhanging section of the overhanging road block, a finishing pavement partition wall is provided in the short side direction for convenience when laying the finishing pavement on the block flat surface formed on a substantially flat surface. Can be set. If this partition wall is set higher than the finished pavement surface, the partition wall can also be used as a road surface drainage block, functioning as an alternative to as curve, and if necessary, a part of the partition wall can be used for drainage. You may comprise so that a notch may be provided. In addition, as for a partition wall, it is good to incline the wall surface inside a road a little outward so that a compactor may not interfere in the compaction work at the time of finishing pavement.

  In addition, a protective fence mounting portion can be provided at the tip of the overhang portion of the overhang road block. The protective fence mounting part is equipped with a hole to insert and stand the protective fence column, and when setting the short side of the overhanging road block long, it may be provided at multiple places with intervals between It is possible to keep only a certain interval when a plurality of blocks are continuously installed, and a block with a protective fence mounting part and a floor without a protective fence mounting part. By providing two types of overhanging roadway blocks, which are block-only blocks, it is possible to adjust the pitch between the columns of the protective fence according to the number of blocks using only the floor plates.

  The overhanging road block is provided with a long hole extending from the weight part of the main body to the mounting part, and at the both end surfaces in the long side direction of the weight part, there are recesses for connection with the overhanging roadway block installed adjacently. By providing a through hole for bar arrangement that penetrates the long hole and is continuous between both connecting recesses, the concrete placement and filling work is facilitated and the continuous overhanging road block is firmly integrated. Is achieved.

Overhanging the roadway of using a block, the method of constructing the pier roadway according to the present invention, buried upright reinforcing piles inside the slope after drilling only widening side carriageway in existing roads of the present invention as described above Then, after placing the shade cap on the top of the reinforcing pile, level the plurality of overhanging road blocks continuously placed on the excavation road surface with the placement portion positioned on the shade pile by the height adjusting means. After placing concrete in the gap between the overhang road block and the excavation road surface, it was decided to finish the paving on the overhang road block.

  Here, as the shade con provided at the top portion of the reinforcing pile, a precast one is preferably used, but this shade con may be formed of cast-in-place concrete. In this case, after the reinforcement piles are erected, only the caps are made of cast-in-place concrete, and then the overhanging road block is placed. The exit road block may be placed, and the cap may be formed integrally with the concrete cast in the gap with the excavation road surface.

  That is, in another construction method of the overhang road according to the present invention, after excavating only the wide side road in the existing road, a plurality of piles that are continuously placed on the excavation road surface are embedded with reinforcing piles embedded inside the slope. After leveling the overhanging road block with the height adjustment means and placing concrete in the gap between the overhanging road block and the excavation road surface, the overhanging roadway is integrally formed up to the top of the reinforcement pile. It was decided to finish the paving on the block.

  The overhanging road block according to the present invention adopts a shape suitable for installation on the shade cap located at the top of the reinforcing pile embedded and standing inside the existing slope, so that the existing slope is in the state of The road can be widened without depending on it. Moreover, since the thin flat main body is adopted, the road surface excavation depth during the widening work can be suppressed to be shallow. And when the block that is integrally molded up to the weight part is placed on the excavation road surface, the stepped part on the bottom side from the weight part to the placement part engages with the shade cap, and the rear end of the weight part is Construction is carried out without the need for anchoring to the excavation ground, etc., because the bar arrangement that protrudes from the bottom of the weight part will be integrated with the cast-in-place concrete in some cases due to strong earth pressure from the buried soil It is possible to improve the safety of falling over the extended road block.

  In addition, by forming the weight part thick, the length of the main body can be shortened and the block construction part can be placed in one side lane, so if one side lane is not subject to construction, it can be used even during widening work Secure and limit traffic restrictions as much as possible. In addition, the height adjusting means provided at three places facilitates stable placement by three-point support and adjustment of steps and levels between adjacent overhanging road blocks.

  Furthermore, the main body flat side formed on a substantially flat surface is easy to finish paving, and it is easy to ensure continuity with the lane side that was not the target of construction, and the paving surface is made by the partition wall of the finishing paving. The partition wall formed with the road side as an inclined surface does not interfere with the rolling work. In addition, by providing a block with a protective fence mounting part at the end of the overhanging part separately from the block only for the floor slab, the block only for the floor slab can be reduced in weight, and the protective fence mounting part The pitch between the columns of the protective fence can be changed by the number of blocks of only the floor slab interposed between the blocks provided with.

  And in the construction method of the overhanging road according to the present invention, it is only necessary to excavate only the roadway on the widening target side in the existing road, and through the cap on the top of the reinforcing pile embedded and standing inside the existing slope. By installing the block, widening construction that does not depend on the state of the existing slope is possible. In addition, after the overhanging road blocks placed continuously on the excavation part are formed with the reinforcement bars in some cases, and even the caps are formed by casting concrete, finish paving only on the roadway on which the overhanging road block is placed. Since it is unnecessary to fix the anchor to the ground or reinforcement to the overhanging part, it is possible to carry out construction easily and in a short construction period.

  Hereinafter, the present invention will be described in detail with reference to the drawings. 1 is a perspective view showing an example of an overhanging road block according to the present invention, FIG. 2 is a plan view of the block, FIG. 3 is a front view of the block, and FIG. 4 is a bottom view of the block. As shown in these drawings, the overhanging road block 11 according to the present invention has a horizontally long rectangular shape in a plan view and a left side in the long side direction of the main body as the overhanging portion 2, and a right side as the weight portion 3. The plane side of the main body is formed to be a substantially flat surface, while the bottom surface side of the main body has a mounting portion 4 between the protruding portion 2 and the weight portion 3.

  The mounting part 4 is a part that will be located on the shade cap provided on the top of the reinforcing pile that will support the widened road during construction of the overhanging road block according to the present invention. The overhanging portion 2 located on the left side is a substantially widened portion. The mounting portion 4 is provided with adjusting bolts 41 as height adjusting means at intervals at two locations in the short side direction. Each of these two adjustment bolts 41 is screwed into a through hole 42 penetrating in the vertical direction, and is configured to be able to advance and retract in the vertical direction on the block bottom surface side by a rotation operation from the block plane side.

  On the other hand, the weight part 3 is thick and formed integrally with the main body so that the bottom surface thereof is located below the bottom surface of the mounting part 4. Therefore, a step 31 is formed at the boundary portion from the placing portion 4 to the weight portion 3, and engagement with the shade cap is achieved by the step 31 at the time of construction, so that easy dropout is prevented. Further, an adjustment bolt 32 as a height adjusting means is disposed near the edge of the weight portion 3, and three overhanging roadway blocks are mounted together with the two adjustment bolts 41 provided in the mounting portion 4. I will support it. Since the adjustment bolt 32 in the weight portion 3 is near the rear end of the block and is easy to rotate, the adjustment bolt 32 is protruded from the bottom surface side of the weight portion 3 without penetrating the weight portion 3. ing.

  A partition wall 21 is erected on the front end flat surface side of the overhang portion 2 along the front end edge in the short side direction. The height of the partition wall 21 may be set so as to match the finished pavement surface, or may be set higher to function as an as-curve substitute. As described above, may be provided. It should be noted that the partition wall 21 is slightly inclined on the road side so that the compacting machine for finishing paving does not come into contact.

  From the weight part 3 to the mounting part 4, a long hole 33 is bored at a substantially central part in the short side direction of the block body, and connection concave parts 34, 34 are provided at both end faces in the long side direction of the weight part 3. There are provided two through-holes 35 and 35 for bar arrangement which are provided so as to cut out the side edges, and continue through the long hole 33 to reach both the connecting recesses 34 and 34. These long holes 33, connecting recesses 34, and reinforcing bar penetration holes 35 contribute to weight reduction of the entire block, and the reinforcing bar penetration holes 35 are bridged between adjacent overhanging road blocks. , 35, by inserting the reinforcing bars into the concrete, and then placing the concrete, it is possible to integrate the overhanging roadway blocks installed.

  5 is a perspective view showing another example of the overhanging road block according to the present invention, FIG. 6 is a plan view of the block, FIG. 7 is a front view of the block, and FIG. 8 is a bottom view of the block. FIG. 9 is an AA cross-sectional view of the block. The overhanging road block 12 of this example is except that the protective fence mounting portion 22 is disposed at the tip of the overhanging portion 2 and that the reinforcing bar 6 is protruded from the bottom surface of the weight portion 3. The basic configuration is the same as the overhanging road block 11 in the example of FIG. That is, at the tip of the overhanging portion 2, there is provided a protective fence mounting portion 22 in which a substantially vertical hole 221 into which a support fence post is inserted and erected, while the weight portion 3 A bar arrangement 6 having a U-shape in front view is arranged on the bottom surface so as to be parallel to two places in the long side direction. The guard fence mounting portion 22 and the bar arrangement 6 are shown in FIG. It is a form added to the overhanging road block 11 consisting only of a floor slab.

  FIG. 10 is a schematic side view of the construction example of the overhang road block according to the present invention as seen from the retaining wall side. The overhanging road block 12 having the protective fence mounting portion 22 shown in the previous FIG. 5 etc. is alternately installed so as to sandwich the overhanging road block 11 of only the floor slab shown in the previous FIG. The state where the protective fence 5 composed of the protective fence column 51 and the guard rail 52 is installed is shown. In this example, there is only one overhanging roadway block 11 with a floor slab and the pitch between the guard fence columns 51 is set narrow. However, if two or more overhanging roadway blocks 11 with only a floor slab are installed continuously, protection will be provided. That is, the pitch between the fence posts 51 can be set widely.

  Next, the construction method of the overhanging road using the overhanging road block will be described. FIG. 11 is a schematic cross-sectional view of an existing road to be widened. In the existing road R of this example, the roadside edge on the right side in the figure is cut through K, and the roadside edge on the left side in the figure is a retaining wall C on which concrete blocks are stacked. For example, when the width of the existing road R is 4 m, ordinary cars can face each other, but if one or both become large cars, the roads cannot face each other. Note that the existing retaining wall C is not changed even if it is a side wall of a water channel, for example, and may be a simple vegetation surface without a stone wall or any artificial structure. In the present invention, the road on which the road side edge forms such a descending slope is widened with respect to the outside direction of the slope.

  FIG. 12 is a schematic cross-sectional view showing a state in which the wide side roadway in the existing road is excavated and the top end of the existing retaining wall is removed. When the existing road R having a width of 4 m is widened by 1 m, only the widened lane R1 is excavated and the top end of the existing retaining wall C protrudes in order to lay the overhanging road block according to the present invention. If this is the case, remove it. In the overhanging road block according to the present invention, the weight part 3 that functions as a counterweight of the overhanging part 2 is formed integrally to be thick, so that the length in the long side direction of the block is increased in the wide roadway. Therefore, it is not necessary to carry out excavation work on the opposite lane R2, and the widening work can be continued while the opposite lane R2 is in service.

  FIG. 13 is a schematic cross-sectional view showing a state in which a reinforcing pile is embedded in an excavated wide side roadway, and a shade cap is arranged on the top of the reinforcing pile. In the excavated lane R1, a reinforcing pile 8 is embedded and erected on the inside of a retaining wall C that forms a slope, and a precast shade cap 7 is disposed on the top of the reinforcing pile 8. The basic crushed stone CR has already been spread on the excavated road surface, and the top end portion of the retaining wall C has been removed to almost the same height as the top surface of the shade cap 7. When the shade control 7 is formed from concrete cast on site, the construction is performed in a similar state, and the overhanging road block is sequentially laid from this state.

  FIG. 14 is a schematic cross-sectional view showing a completed state of the widening work. The same applies to the overhanging road block 11 that is composed only of a floor slab and does not have the protective fence mounting portion 22, but when the overhanging road block 12 is laid, the front surface is between the block and the retaining wall C. A formwork F may be interposed. As the front mold F, a belt-like rubber or sponge is preferably used. The overhanging road block 12 that is continuously installed is moved forward and backward by adjusting bolts 32, 41, 41, which are arranged at two places on the shade control 7 and one place on the bottom face of the weight part 3 near the rear end of the block. Level adjustment is performed, and at the same time, an appropriate number of reinforcing bars are inserted in the short side direction so as to be inserted into the reinforcing bar penetration hole 35 and, if necessary, the reinforcing bar 6 provided as a countermeasure for a large vehicle. Concrete is cast from 33 and a connecting recess 34 (both not shown), and the concrete is placed in the gap between the continuously installed overhanging road block 1 and the top surface of the existing retaining wall C or the basic crushed stone CR on the excavation road surface. The blocks are integrated with each other.

  Thereafter, the surrounding space of the installed overhangway block 12 is backfilled and finish paving is performed. The finish pavement may be aligned with the top edge of the partition wall 21 standing at the end of the block. Good. Finally, the protective fence 5 is attached and the construction of a series of overhanging roads is completed.

  FIG. 15 is a schematic cross-sectional view showing a completed state of the widening work that employs the method of integrally forming the shade control on site. In this construction method, a plurality of overhangs can be obtained by simply placing the foundation crushed stone CR on the excavated road surface and leveling it without placing a cap on the top of the reinforcing pile 8 embedded in the widened lane R1 that has been excavated. The roadway block 12 is continuously placed. The point of removing the top end portion of the retaining wall C as necessary and the point of interposing the front formwork F between the top end portion and the overhanging road block 12 are the same as the construction method of the previous example, Since there is no cap when laying the overhanging road block 12, the adjustment bolt 41 does not function, and the level adjustment is performed by the advancement and retraction of the adjustment bolt 32 disposed on the bottom surface of the weight portion 3 near the rear end of the block. Become. Thereafter, an appropriate number of reinforcing bars are arranged as in the previous construction method, concrete is cast from the elongated hole 33 of the overhanging road block 12 and the connecting recess 34 (both not shown), and the existing retaining wall C The concrete filled in the gap between the top surface of the ground and the ground crushed stone CR on the excavation road surface also serves as the shade cap 7 '. After the formation of the shade cap 7 'and integration of the laid blocks, the surrounding space is backfilled and finished paving is performed, as in the previous construction method, and the overhanging road is completed.

It is the perspective view which showed an example of the overhanging road block based on this invention. It is a top view of the overhanging road block of the example of FIG. It is a front view of the overhanging road block of the example of FIG. It is a bottom view of the overhanging road block of the example of FIG. It is the perspective view which showed the other example of the overhanging road block based on this invention which provided the protection fence mounting part in the front-end | tip of the overhanging part. It is a top view of the overhanging road block of the example of FIG. It is a front view of the overhanging road block of the example of FIG. It is a bottom view of the overhanging road block of the example of FIG. It is AA sectional drawing of the overhanging road block of the example of FIG. It is the schematic side view which looked at the construction example of the overhanging road block concerning this invention from the retaining wall side. It is a schematic cross-sectional view of the existing road used as widening construction object. It is a schematic cross-sectional view which shows the state which excavated the wide side roadway in the existing road, and removed the ceiling end of the existing retaining wall. It is the schematic cross-sectional view which showed the state which embedded the reinforcement pile in the excavated wide side roadway, and arranged the shade cap on the top part of this reinforcement pile. It is the schematic cross-sectional view which showed the completion state of the widening construction. It is a schematic cross-sectional view which shows the completion state of the widening construction which employ | adopted the method of integrally forming even a shade cap on the spot.

Explanation of symbols

2 Overhanging part 3 Weight part 4 Placement part 5 Guard fence 6 Reinforcement 7 Shading control 8 Reinforcement pile
11 Overhang road block with floor slab only
12 Overhang road block with protective fence mounting
31 steps
32 Adjustment bolt
33 Slotted hole
34 Connection recess
35 Bar arrangement holes
41 Adjustment bolt
42 Through-hole
51 Guard fence support
52 Guardrail C Retaining wall CR Foundation crushed stone F Front formwork K Cut through R Existing road

Claims (3)

As an overhanging road block that is used to widen the road whose roadside edge forms a descending slope in the outward direction of the slope, it is placed on the shaded condominium located at the top of the reinforcing pile embedded upright inside the existing slope. One side of the long side of the substantially flat main body is an overhanging part, the other side is a weight part, and the main body plane side is formed on a substantially flat surface, while the main body bottom side is Is provided with a mounting portion on the shade cap between the overhanging portion and the weight portion, and the weight portion is formed thick and integrally so that the bottom surface of the weight portion is located below the bottom surface of the mounting portion. And the overhanging road block provided with height adjusting means on the bottom surface of the mounting portion and the weight portion ,
The weight part has a bar arrangement projecting from its bottom,
The overhang road block is characterized in that a partition wall for finishing pavement is erected in the short side direction at the tip of the overhang portion, and a protective fence mounting portion is disposed at the tip . After excavating only the wide side roadway on the existing road, a reinforcing pile is embedded inside the slope, and a shade con is placed on the top of the reinforcement pile, and then excavated while the mounting portion is positioned on the shade con A plurality of overhanging road blocks continuously placed on the road surface are leveled by means of height adjustment, concrete is placed in the gap between the overhanging road block and the excavation road surface, and then finish paving on the overhanging road block The construction method of the overhanging road using the overhanging road block according to claim 1 . After excavating only the wide side roadway on the existing road, reinforcing piles are embedded inside the slope, and a plurality of overhanging road blocks continuously placed on the excavation road surface are leveled by the height adjustment means, after integrally formed bevel configuration of the reinforcing Kuiitadaki portion by pouring the concrete in the gap between the carriageway block and drilling the road out, according to claim 1, characterized in that the finishing pavement on the overhang roadway block The construction method of the overhang road using the overhang road block.

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