JP2008075359A - Precast concrete guard fence for median strip of automobile road viaduct and its construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a precast concrete guard fence installable in a construction limit of a line width, capable of further reducing cost without requiring to assemble a scaffold under a viaduct, and capable of shortening an installing construction period. <P>SOLUTION: This precast concrete guard fence 1 is arranged over ground coverings 11a and 11a of roadbeds 11 and 11 of the right-left viaducts for upper-lower travel lines, and has bilaterally symmetrical side surfaces 4 and 4 composed of a lower surface 2 of a maximum width, an upper surface 3 of a minimum width, a moderately inclined lower inclined face 4a and a steeply inclined upper inclined face 4b. Its lower surface 2 has a straddling-shaped recessed groove 5 in a central part in its longitudinal direction. Both-side lower surfaces 2 of the recessed groove 5 are formed as a horizontal plane 6, and a vibration absorbing rubber plate 9a is arranged and installed in a lower part of these horizontal planes 6. These precast concrete guard fences 1 are composed of a continuously connecting body 1b of one row formed by integrally connecting a plurality of precast concrete blocks 1a of 3 to 5 pieces. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention provides a guard fence, particularly a precast concrete block, which is installed as a central separator for separating the upper and lower traveling routes in a viaduct installed in parallel on the upper and lower traveling routes of a highway and a general automobile road. The present invention relates to a guard fence composed of a connecting body.

  As guard fences as protective fences on expressways and general motorways, generally steel guard fences 18 provided on steel poles 17 shown in FIG. 16 and precast concrete guard fences shown in FIG. 19 and a concrete guard fence placed on-site are used in parallel in two rows on the side of each of the upstream and downstream routes. Among these, in view of durability, strength, and cost, the steel pole 17 and the steel plate guard fence 18 shown in FIG. 16 are being replaced with a precast concrete guard fence 19.

  By the way, in a route bridge such as a highway or a motorway viaduct or a river bridge, the upper and lower traveling routes are, for example, two lanes on one side or three lanes on one side, and thus have a wide roadway width. Therefore, when constructing these route bridges, the route bridge on the upstream route side and the route bridge on the downstream route side are constructed separately with the upstream route plate and the downstream route plate adjacent to each other in parallel. Yes. For example, the Meishin Expressway is constructed with separate viaducts between Suita and Amagasaki. In this way, the road slabs 11 of the upper and lower traveling routes such as viaducts are constructed separately, so that there is a gap 13 at the boundary between each of the upstream route slab 11 and the downstream route slab 11. As a result, in the road slabs 11 and 11 of the respective vertical traveling routes, one row of concrete guard fences 19 is installed at the end portions of the respective road slabs 11 with the anchor bolts 20. As shown in FIG. 17, a total of two guard fences 19, 19 made of concrete are locked with anchor bolts 20 to ensure the safety of the vehicle while traveling. .

  By the way, in the concrete guard fence 19, when a traveling vehicle accidentally collides with the concrete guard fence 19, the impact load 30 acts on the concrete guard fence 19 in the arrow direction, and the wheel load 31 acts on the road slab 11 in the arrow direction. Act on. As a result, the combined bending load 32 is unilaterally applied to the anchor bolt 20 that fixes the concrete guard fence 19 to the end of the road block 11. Therefore, prior to the installation of the concrete guard fence 19, it is necessary to perform work on the end of the road slab to increase the thickness of the upper surface of the floor slab. In addition, long-term lane control is necessary for this construction, and there was a problem with construction risk especially in the curve section.

  Furthermore, when the traveling vehicle collides with the concrete guard fence 19 from an oblique direction, the side surface 4 of the lower portion of the concrete guard fence 19 is formed as an inclined surface in order to reduce the impact and return the direction of the vehicle to the traveling route direction. Yes. However, even if such a concrete guard fence 19 is installed, the traveling vehicle breaks through the guard fence and jumps to the opposite opposite lane, causing danger to the opposite lane traveling vehicle, or the upper and lower traveling routes. Are still causing problems, such as blocking the swords together and splattering debris from accidents.

  That is, these concrete guard fences 19 need to have sufficient strength and rigidity against a car collision. However, since there is an architectural limit to the road line width of the road, the thickness of the conventional guard fence 19 made of precast concrete as shown in FIG. 17 is, for example, 200 mm on the upper surface 3 and 1000 mm in height. The size is assumed. Further, the lower end of the guard fence 19 made of precast concrete is fixed by the anchor bolt 20 inserted through the back plate 11 such as a viaduct or a river bridge as described above so as not to move due to the impact of a car collision. ing. In fixing with the anchor bolt 20, since it is inserted from the lower surface of a bridge such as a viaduct and fixed with a nut, it is necessary to construct with a scaffold reaching the back surface of the viaduct. In addition, in the case of viaducts and river bridges, there is a limit on the road width associated with the bridge width, in the case of river bridges, etc., it is difficult to install scaffolding, and there are also building limits on the road width as described above. Along with this, there was a limit to installing a guard fence made of precast concrete with a wide thickness.

  By the way, as a guard fence for an expressway or a general automobile road, for example, the present applicant has developed a precast concrete guard fence with improved strength (see, for example, Patent Document 1). In addition, a concrete guard fence (see, for example, Patent Document 2) placed on-site with a low coefficient of friction, and also effectively absorbs shocks during vehicle collisions, A guard fence made of concrete that prevents breakage (see, for example, Patent Document 3) has been developed. However, these are all related to a general motorway, and are not related to a viaduct or a river bridge in which the upper and lower travel routes are formed as a single bridge, and the upper and lower travel routes are separately bridged.

JP-A-6-136724 (11) JP-A-8-92923 (1) JP 10-131136 A (1)

  The problem to be solved by the present invention is a precast concrete that is rigidly erected by fastening with bolts to the ends of the respective road slabs of a conventional highway or highway viaduct or river bridge Instead of the guard fence made of precast concrete, the precast concrete guard fence has a width approximately double that can be installed across the gap between each slab of the upper and lower travel lines within the construction limit of the line width. A straddle-shaped concave groove is provided on the lower surface of the guard fence made of metal, and the concave groove is fitted to a standing ground cover at each end of the road slab and used for preventing slip of the precast concrete guard fence, or By removing the ground cover and installing anti-slip means, the cost can be reduced by eliminating the scaffolding built under the viaduct of the road slab of the conventional construction method, and the installation period is short Precast concrete guard fences and construction methods aimed at is to provide.

  The precast concrete guard fence of the present invention has a height of about 1000 mm, which is the same as the height of a conventional precast concrete guard fence. However, other sizes are different from the conventional ones, the width of the upper surface is about 400 to 485 mm, which is about twice the conventional size, and the width of the lower surface is about 800 to 900 mm, which is about twice the conventional size. Unlike the case where one surface is an inclined surface and the other surface is a vertical surface, both sides have a symmetrically inclined surface with a narrow width of 400 to 480 mm as it goes upward from 800 to 900 mm of the lower surface. Furthermore, the precast concrete guard fence has a length of 2000 mm. These precast concrete guard fences are articulated in the longitudinal direction to form an integrated precast concrete guard fence consisting of at least 14 meters of articulated bodies of precast concrete blocks.

  Further, the central portion of the lower surface in the longitudinal direction of the precast concrete guard fence has a concave groove recessed upward, and the width of the concave groove varies depending on the width of the lower surface of the precast concrete guard fence. First, in the case of a guard fence made of precast concrete with a bottom surface width of 900 mm, the width of the concave groove is 480 mm, and the height of the concave groove is a type that does not reinforce the inside of the guard fence around the concave groove and a steel jacket. The height is 120 mm for the non-reinforced type, while the height is 220 mm for the type reinforced with the steel jacket. These concave grooves cover the ground cover protruding upward from the upper and lower road plate end portions. Further, in the case of a guard fence made of precast concrete having a width of 800 mm on the lower surface, the width of the groove is 200 to 350 mm. For this reason, it is assumed that the ground cover protruding above the end of each road slab of the viaduct on the viaduct is removed, and this precast concrete guard fence is covered across the gap between the vertical road slabs from which the ground cover has been removed. Yes. The bottom surfaces of both outer sides of the concave grooves of these precast concrete guard fences are horizontal on the bottom surfaces on both sides of the gap, and a vibration-absorbing rubber plate is interposed between these horizontal bottom surfaces and the road plate surface to It is to be installed on the upper and lower plate.

  Since the precast concrete guard fence of the present invention has the above-mentioned size and is installed across the gap between the elevated bridge slabs, the conventional thin precast concrete guard fence is attached to the end of each slab of the vertical travel route. The width of the precast concrete guard fence is reduced by the width of the gap between the upper and lower road slabs, one row at a part, that is, two rows of upper and lower road slabs. Therefore, there is a margin in the line width of the upper and lower road slabs of each viaduct, and the guard fence made of precast concrete can be installed with a margin despite the existence of the construction limit of the viaduct width. Furthermore, the width of the precast concrete guard fence of the present invention is about twice as large as that of the conventional precast concrete guard fence, so that the weight is also about twice as heavy. Therefore, like the conventional precast concrete guard fence, the precast concrete guard fence of the present invention is not only fixed to the viaduct with an anchor bolt, but is simply put on the ground cover and pushed by the collision of the traveling vehicle. There is no movement to the route side. For this reason, in order to fix the guard fence made of precast concrete to the road slab, it is not necessary to assemble a large scaffold for fixing the anchor bolt to the viaduct through the back side of the viaduct at the lower part of the viaduct. Further, it is not necessary to drill holes for inserting anchor bolts in the viaduct of the viaduct, and therefore it is not necessary to reinforce the road plate. Furthermore, since the present invention interposes a vibration absorbing rubber plate on the lower surface of the precast concrete guard fence, it absorbs and relaxes vibrations and impacts caused by collisions of vehicles traveling in the opposite lane, and affects vehicles traveling on the other road surface. There is no effect. Furthermore, the movement of the precast concrete guard fence can be suppressed by the frictional force of the rubber.

  In the above, the cover of the end of each road slab is removed, and a rectangular parallelepiped concrete cap-like stopper is further provided in the gap between the upper and lower road slabs. It is fitted with water and misalignment. In this case, a water stop and a slip stop are fitted into the recessed groove of the guard fence made of precast concrete via a rubber water seal. By inserting this concrete cap-shaped water stop and slippage between the slabs of the viaduct on the viaduct, the weight of the above-mentioned precast concrete guard fence even if the car collides with the precast concrete guard fence. In addition, a rectangular concrete cap-shaped water stop and slip stopper are engaged with the road slab, so even if there is no ground cover, it is sufficiently prevented from moving to the opposite lane on the side. , You will not be obstructed by being pushed into the opposite lane. Furthermore, if a rubber waterproof seal for water stop is inserted between the bottom surface of both sides of the concrete cap-shaped water stop / deviation ridge and the road surface, rainwater that falls on the road surface will be It prevents entry into the gap between the plates, and the road plate itself is eroded by rainwater, and rainwater does not hang under the overpass.

  Further, as another means of the present invention, when the ground cover is removed, in addition to the concrete cap-like water stop / slip stopper having the above-described configuration, the straddle-shaped concave groove of the precast concrete guard fence is formed. A misalignment made of a steel plate extending vertically downward from the center can also be provided. By inserting the steel plate misalignment between narrow bridge slabs on the viaduct on the viaduct, it is possible to prevent the guard fence made of precast concrete from moving due to the vibration of the slab on the vertical runway. Of course, even in this case, even if the car collides with the guard fence made of precast concrete, it is not pushed by the car and moves to the half body route side. However, since this steel plate has no water-stopping property, in this case, the vibration-absorbing rubber plate is provided with a water-stopping function on the straddled lower surface of the precast concrete guard fence.

  The above-mentioned precast concrete guard fence is integrated by connecting in a longitudinal direction from a concrete block divided into 3-5 pieces, and is formed into a connecting body having a length of 14 m or more. On the other hand, since the weight of the concrete block of the precast concrete guard fence per piece is 3 to 6 tons, the precast concrete guard fence integrally formed by connecting from this concrete block is 15 tons or more on average. Because it is heavy, it is not easily moved by a car crash.

  The connecting body of the precast concrete guard fence made of the precast concrete block is integrated with the upper central portion of the precast concrete guard fence through a PC steel rod having a muscle tension of 29.4 t of φ23 mm in the longitudinal direction. Or it replaces with what integrates through this PC steel rod, and has a vertical ridge in the center part of one block end face of a longitudinal direction, and a vertical ridge in the center part of the other block end face A plurality of precast concrete blocks having ridges are formed by fitting and engaging the ridges with the ridges of adjacent blocks.

  Furthermore, these precast concrete guard fence joints form a top recess at the center of the top surface of the longitudinal end of each precast concrete block, and further, the upper slope of the side surface of each precast concrete block A side recess is formed at the longitudinal end of the lower portion of the surface. Bolts are erected on the surfaces of the recessed portions of the respective precast concrete blocks at the upper surface recessed portion and the side recessed portion between these adjacent precast concrete blocks. The bolts of the upper concave part and the side concave part of these adjacent precast concrete blocks are fitted with steel connection plates having bolt insertion holes and tightened with nuts, and formed into a connecting body to form a precast concrete guard. It is a fence.

  That is, the means of the present invention for solving the above-described problems is that, in the invention of claim 1, the maximum width lower surface, the minimum width upper surface, the gentle lower inclined surface, and the steep following the lower inclined surface. It has both side surfaces made up of an upper inclined surface, has a straddle-shaped concave groove in the longitudinal center of the lower surface of the maximum width, and a vibration absorbing rubber plate is disposed under the lower surface, Precast for median strips installed on the upper and lower slabs of a viaduct on a motorway, characterized in that it consists of a connecting body in which longitudinally placed stationary precast concrete blocks placed across the gap are connected. It is a concrete guard fence.

In the invention of claim 2, the stationary precast concrete block having a straddle-shaped concave groove in the longitudinal center portion of the lower surface of the maximum width and placed across the gap between the upper and lower path plates is the precast concrete block. A plurality of steel rib plates resembling a cross-sectional shape perpendicular to the longitudinal direction of the lower part of the block in the lower part of the block between both side surfaces of the lower part of the lower inclined surface and the lower region of the steep upper inclined surface following the upper part. A steel strip comprising: a central separation band installed on the upper and lower slabs of a viaduct of a motorway according to claim 1, wherein the steel jacket is embedded at equal intervals in the longitudinal direction of the lower part of the block. It is a guard fence made of precast concrete.
In the present invention, since the precast concrete block is installed without removing the ground cover as it is, pre-preparation work is not necessary for this installation. On the other hand, since the wall thickness between the upper corner of the inner wall of the recessed groove that fits the left and right ground cover and the side surface of the precast concrete block is reduced, the steel jacket is placed inside the lower part of the precast concrete block to reinforce the strength. Is inherent.

In the invention of claim 3, the straddle-shaped concave groove has a height and a width that can be fitted with a joint grout around the ground cover in which the upper part of the standing erection is partially cut at each end of the upper and lower path plates. 3. A precast concrete guard fence for a median strip installed in a straddle manner on a viaduct on a viaduct of an automobile road according to claim 1 or 2.
In this invention, when installing a precast concrete block, only a part of the upper part of the ground cover rising upward from each end of the upper and lower slabs of the current motorway viaduct is cut and lowered. Since the lower ground cover left behind is not removed, it is covered and installed with a straddle-shaped concave groove in a state where a part is left, so that the height of the concave groove of the precast concrete block can be lowered. Therefore, the wall thickness between the upper corner of the inner wall of the groove of the precast concrete block and the side surface of the precast concrete block is thicker than that left without cutting a part of the above ground cover. The strength of the precast concrete block does not decrease.

In the invention of claim 4, the straddle-shaped concave groove cuts a ground cover standing upright at each end of the upper and lower road slabs, and replaces the cut ground cover and engages with a gap between the upper and lower road slabs. 3. A concrete cap-like water stop / shift stopper protruding from the lower surface is fitted in the inside of the concave groove, and straddles the upper and lower slabs of the viaduct of the motorway according to claim 1 or 2 It is a guard fence made of precast concrete for the median strip installed in the shape.
When the distance between the upper and lower slabs is wide, the concrete cap-like water stop and displacement stop prevent the movement of the stationary precast concrete block due to the collision of the automobile.

In the invention of claim 5, the straddle-shaped concave groove cuts a ground cover standing upright at each end of the upper and lower path plates, and replaces the cut ground cover with the upper and lower portions below the center of the block above the concave groove. 3. For a median strip installed straddling the upper and lower road plates of a viaduct of a motorway according to claim 1 or 2, characterized in that it has a misalignment made of a steel plate inserted perpendicularly to the gap of the road plate This is a guard fence made of precast concrete.
The lower end of the thin steel plate, which is intended to prevent the movement of the stationary precast concrete block due to the automobile collision, is inserted by the narrow gap between the upper and lower plate slabs. The movement of the stationary precast concrete block due to the collision of the car is to be prevented.

In the invention of claim 6, the connecting body in which the precast concrete blocks are continuously provided in the longitudinal direction is formed by connecting the precast concrete blocks adjacent to each other by inserting a PC steel rod in the center in the longitudinal direction of each precast concrete block. A guard fence made of precast concrete for a median strip installed in a straddling manner on a viaduct plate of a viaduct of a motorway according to any one of claims 1 to 5.
By moving the PC steel bar between the blocks and connecting them, the movement of the stationary precast concrete block due to the collision of the automobile is more strongly prevented.

In the invention of claim 7, the connecting body in which the precast concrete blocks are continuously provided in the longitudinal direction has a plurality of precast concretes having protrusions on one block end surface in the longitudinal direction and recesses on the other block end surface. A plurality of precast concrete blocks which are composed of blocks and which are continuously connected in the longitudinal direction by engaging the ridges on the block end surfaces in the longitudinal direction of the adjacent precast concrete blocks. A precast concrete guard fence for a median strip installed in a straddling manner on the upper and lower slabs of a viaduct of an automobile road according to any one of claims 1 to 6.
A connecting body can be easily formed by fitting the concave and convex stripes between the connected blocks.

In the invention according to claim 8, the precast concrete block constituting the connecting body includes an upper recessed portion formed at the center of the upper surface of the longitudinal end portion of the precast concrete block and a longitudinal end portion of the upper inclined surface of the side surface of the precast concrete block. Side recesses formed at the bottom of the upper and lower recesses formed at the center of the upper surface of the longitudinal end of the adjacent precast concrete block and at the bottom of the longitudinal end of the upper inclined surface of the side of the adjacent precast concrete block 8. The means of any one of claims 1 to 7, wherein the means is connected to the formed side recesses by means of steel connection plates that are inserted into the upper and lower plates of the viaduct of the motorway. This is a precast concrete guard fence for the median strip.
The connecting blocks are connected to each other by bolting the connecting blocks with a steel connecting plate, thereby further improving the integration of the connecting.

  Since the present invention has the above-described means, the precast concrete block constituting the precast concrete guard fence of the present invention has a vibration absorbing rubber plate disposed below the viaduct surface of the viaduct on the upper and lower traveling routes. Since it can be installed by mounting it, the period required for the installation work is short, and the construction cost can be greatly reduced. Furthermore, since the size is approximately twice that of a conventional precast concrete guard fence, the weight is also approximately twice, so that it is difficult to move due to the impact of a car collision. Since it is not necessary to fix with anchor bolts as in the prior art, construction can be done quickly and easily even at night, and traffic is not obstructed. Moreover, since the precast concrete block of the present invention is installed across the upper and lower road slabs, the impact at the time of collision is distributed to the left and right road slabs even if the traveling vehicle collides, and each road slab is bent in the opposite direction. Since a load is applied and cancels each other, it is difficult to move to the opposite route side even if a collision occurs. In addition, because it is large enough, it has sufficient impact resistance against vehicle collisions, prevents collision vehicles from entering the opposite lane, prevents chain accidents, and easily returns to the current state Can be implemented. In addition, since a vibration absorbing rubber plate is provided, movement due to road slab vibration is suppressed, and vibration is not transmitted to the road lane in the opposite lane to be affected. Furthermore, the connection between the end faces in the longitudinal direction of the precast concrete block, the connection between adjacent blocks by a PC steel rod, the engagement by the ridges and recesses provided on the longitudinal end faces of the adjacent blocks, and further, between the adjacent blocks Since it is connected by the steel connecting plate fitted to the upper recessed portion and the side recessed portion, it is difficult to move even if it receives a vehicle collision from the side.

  In addition, a rectangular concrete cap-shaped water stop fitted in a straddle-shaped concave groove on the lower surface of the precast concrete guard fence between the left and right viaduct road bridges for the upper and lower traveling routes straddling the straddle. Since it has a protruding shear key that protrudes downward from the misalignment that also serves as a slippage, by inserting this protruding shear key into the gap between the left and right viaduct road plates, it suppresses movement due to road plate vibration, Furthermore, the movement by the impact at the time of the collision of a vehicle can be suppressed further. In addition, when the gap between the viaducts is narrow, it can be easily inserted into the narrow gap by using the steel plate as the gap instead of the concrete cap-shaped gap. The movement of the precast concrete guard fence is prevented. Furthermore, since anchor bolts are not inserted and screwed into the road slab as in the prior art, even if the precast concrete guard fence moves, it is easy to restore the precast concrete guard fence to its original state. Furthermore, since the precast concrete guard fence is formed from a plurality of short precast concrete blocks, it is easy to handle and can be easily constructed on the construction site with a crane. It is effective.

  The best mode for carrying out the present invention will be described with reference to the drawings. FIG. 4 shows a guard fence 1 made of precast concrete according to the present invention installed on left and right viaduct road slabs 11 for up and down travel routes. Asphalt pavement 12 is constructed on the road slab 11 on both sides of the placed precast concrete guard fence 1. The guard fence 1 made of precast concrete includes a lower surface 2 having a maximum width, an upper surface 3 having a minimum width, a lower inclined surface 4a that is gently inclined, and an upper inclined surface 4b that is steeply inclined following the lower inclined surface 4a. It consists of a precast concrete block 1a having left and right symmetrical sides 4, 4. The lower surface 2 of the guard fence 1 made of precast concrete has a straddle-shaped concave groove 5 straddling the gap 13 between the upper and lower viaducts 11 and 11 at the center in the longitudinal direction. The lower surface 2 of the precast concrete guard fence 1 on both sides of the straddling groove 5 is a horizontal surface 6. A vibration absorbing rubber plate 9a having the same width as that of the horizontal plane 5 is interposed between the lower portions of the left and right horizontal planes 6 and the road slabs 11 of the vertical lines. As shown in FIG. 3 or FIG. 6, these precast concrete guard fences 1 are formed from a connecting body 1b in which 3 to 5 plural precast concrete blocks 1a are integrally connected.

  The size of the precast concrete block 1a is 800 to 900 mm with the maximum width 14 of the lower surface 2, and 400 to 485 mm with the minimum width 15 of the upper surface 3, and the groove of the straddling concave groove 5 in the center of the lower surface 2. The width 16a is 200 to 520 mm. The groove width 16a of the concave groove 5 depends on the width of the gap 13 between the left and right viaduct road slabs 11 for the up-and-down traveling route to be installed, and is the same as the gap 13 or the land rising from the road slab. In the road slab 11 having the cover 11a, the width of the road slab 11 is a wide 520 mm that covers the two left and right ground covers 11a of the upper and lower road slabs 11. Furthermore, the height of the precast concrete block 1a is 950 to 1050 mm, which is the same height as that of the conventional concrete guard fence, and is approximately 1000 mm. In this case, the height of the lower inclined surface 4a is 270 mm, and the height of the upper inclined surface 4b is 730 mm. The width of the upper surface 3 of the precast concrete guard fence 1 of the present invention is approximately twice that of a conventional concrete guard fence, and the width of the lower surface 2 is approximately twice that of the conventional one. Further, the length of the connecting body 1b of the precast concrete guard fence 1 is at least 14 m. As described above, this precast concrete guard fence 1 is formed by connecting a plurality of 5 to 5 precast concrete blocks 1a in an integrated manner as a connecting body 1b. Connected.

  When the precast concrete block 1a is installed as a guard fence across the upper and lower road slabs 11, 11, the precast concrete block 1a is formed at the longitudinal center of the lower surface 2 which is the maximum width 14 of the precast concrete block 1a. The straddling concave groove 5 is placed across the gap 13 between the upper and lower road slabs 11, 11. For this installation, the precast concrete block 1a is placed in the lower part of the precast concrete block 1a, which is a lower region portion between both side surfaces of the gentle lower inclined surface 4a and the steep upper inclined surface 4b following the upper portion. A steel jacket 1i having a plurality of steel rib plates 1h that are similar to the cross-sectional shape of the block lower part perpendicular to the longitudinal direction and spaced apart at equal intervals is formed in the longitudinal direction of the lower part of the block. In this case, as shown in FIG. 1, the precast concrete block 1a has an end surface shape with a maximum width 14 of the lower surface 2 of 890 mm, a minimum width 15 of the upper surface 3 of 485 mm, and a straddle-shaped concave groove formed on the bottom surface of the block. 5 has a maximum groove width 16a of 510 mm and a groove height 16b of 220 mm. Therefore, the shortest distance between the groove shoulder 16c of the concave groove 5 and the lower inclined surface 4a of the block is 60 mm, and the precast concrete block 1a at that portion is thin. Therefore, in order to reinforce the strength of this portion, the steel jacket 1i is included in the lower part of the precast concrete block 1a. That is, the upper end portions of these steel jackets 1i are inserted into the lower portion of the upper inclined surface 4b. In this means, the ground cover 11a erected from each end of the upper and lower road slabs 11, 11 can be left as it is and used for fitting with the concave groove 5, and the precast concrete block 1a is used for the vehicle. It is intended to prevent movement in a collision.

  In another embodiment, the size of the outer shape of the precast concrete block 1a is the same as that having the steel jacket 1i, but the groove 5 at the center of the lower surface has a groove width as shown in FIG. 16a is the same at 510 mm, but the groove height 16b is as low as 110 mm. Therefore, the precast concrete block 1a of this embodiment is partially cut at the upper part of the ground cover 11a standing from each end of the upper and lower road slabs 11 and lowered to a height of 100 mm. It is assumed that there is a straddle-shaped concave groove 5 having a height and a width that can be fitted by interposing a grout 9b for bonding around the cover 11a. In this form, when installing the precast concrete block 1a, it is only necessary to cut a part of the upper portion of the ground cover 11a that rises upward at each end of the upper and lower road slabs 11 of the current motorway viaduct. Since the ground cover 11a having a height of 100 mm can be installed without being removed, the height of the concave groove 5 of the precast concrete block 1a can be reduced. Therefore, as a result of setting the groove height 16b of the ground cover 11a to 110 mm as described above, the shortest distance between the groove shoulder 16c of the concave groove 5 and the lower inclined surface 4a of the block is 140 mm, which is shorter than the above-described form. Since it becomes twice or more, the strength of the precast concrete block 1a does not decrease even if the steel jacket 1i is not present in the lower part of the precast concrete block 1a. Therefore, in order to install this precast concrete block 1a, it takes time and cost to cut the upper part of the ground cover 11a that hangs down at the ends of the upper and lower road slabs 11 and 11, but the precast concrete block 1a. As such, since it is not necessary to have the steel jacket 1i inherently as in the above-described embodiment, the manufacturing cost can be reduced and the manufacturing is also easy.

  In yet another embodiment, unlike the above, as shown in FIG. 4, all of the ground cover 11a that rises upward from each end of the upper and lower road slabs 11 of the current motorway viaduct is shown. This is a precast concrete 1a that is cut and removed and installed on the upper and lower road slabs 11 and 11 without the ground cover 11a for use as a median strip. In this way, when all of the cover 11a rising upward from each end of the road slabs 11 and 11 is removed, it is removed from each end of the upper and lower road slabs 11 and 11 in order to prevent movement due to the collision of the car. Instead of the ground cover 11a, a cap made of concrete that protrudes on the lower surface of the ridge 10b that engages with the gap 13 between the upper and lower path slabs 11 and 11 in the straddle-shaped concave groove 5 on the lower surface of the precast concrete 1a. The water-stop / slip-off 10a in the shape is fitted.

  When all of the ground cover 11a rising upward from each end of the upper and lower road slabs 11 and 11 of the viaduct is cut and removed as in the above embodiment, the bridge slabs 11 and 11 are straddled. The width of the lower surface of the precast concrete 1a to be installed is not limited by the left and right sizes of the ground cover 11a of the upper and lower road slabs 11, 11. Therefore, the width of the lower surface of the precast concrete 1a can be made narrower than the case where the ground cover 11a is provided, so that the width is 750 to 850 mm, and typically 800 mm. Accordingly, the width of the upper surface of the precast concrete 1a is set to 380 to 420 mm, and typically 400 mm. However, also in these, the height of the precast concrete 1a is 950 to 1050 mm, typically 1000 mm, the height of the lower inclined surface is 270 mm, and the height of the upper inclined surface 4b is 730 mm. Further, the groove width 16a of the concave groove 5 on the lower surface was 150 to 350 mm, and the groove height 16b was 35 to 40 mm. The groove width 16a depends on the gap 13 between the upper and lower road slabs 11 and 11 to be installed, and is wider than these gaps, and the width of the ridge 10b protruding from the lower surface of the cap-shaped concrete displacement stopper 10a. Can be inserted into the gap 13 between the upper and lower road plates 11, 11.

  In still another embodiment, all of the standing ground cover 11a is removed from each end of the upper and lower road slabs 11 and 11 of the viaduct, and the upper and lower road slabs 11 are replaced with the removed ground covering 11a. , 11, which is formed by a steel plate 10 d inserted perpendicularly into the gap 13 between the upper and lower road slabs 11, 11 from the center of the upper block of the concave groove 5 of the precast concrete 1 a installed across the gap 13. A precast concrete block 1a having That is, when the gap 13 between the upper and lower road slabs 11, 11 is narrow, the protruding ridge 10 b below the concrete cap-like displacement stopper 10 a may not be inserted into the gap 13. In order to make it difficult for the precast concrete block 1a to move when the width of the gap 13 is narrow in this way, the straddle-like concave groove 5 on the lower surface 2 is vertically perpendicular to the center as shown in FIG. It can also be set as the precast concrete block 1a which has the gap stop 10 which consists of the steel plates 10d extended. In this case, the shape of the straddle-shaped concave groove 5 can also be an arc as shown in FIG.

  In the case where the precast concrete guard fence 1 for the median strip composed of the connecting body 1b is formed by connecting the precast concrete blocks 1a of the above-described forms in the longitudinal direction, PC steel is provided at the longitudinal center of each precast concrete block 1a. A plurality of, for example, 3 to 5, adjacent precast concrete blocks 1a that are inserted through the rod 1g are connected to form a 14-length precast concrete guard fence 1. In this case, the PC steel bar 1g is made of, for example, φ23 mm, and the precast concrete guard fence 1 is formed by connecting the precast concrete blocks 1a to each other with the tension force of the PC steel bar 1g being 29.4t. Thus, the precast concrete guard fence 1 formed by connecting with the PC steel rod 1g does not easily move to the opposite lane even if it receives an impact caused by a car collision.

  Further, in another embodiment, the connecting body 1b including the precast concrete block 1a and the adjacent precast concrete block 21a for forming the guard fence 1 made of precast concrete is precast concrete as shown in FIG. The block 1a and the adjacent precast concrete block 21a have a longitudinally protruding ridge 7a at the center of one block end surface 7 in the longitudinal direction and a longitudinally recessed ridge 8a at the center of the other block end surface 8. ing. A plurality of ridges 7a of the precast concrete block 1a are engaged with the recesses 28a of the other block end surface 28 of the adjacent precast concrete block 21a in the engagement direction 29 indicated by an arrow in FIG. The connecting body 1b is composed of precast concrete blocks 1a, 21a.

  Further, in the embodiment shown in FIGS. 10 to 12, the connecting body 1b has an upper surface at the center of the width of the end portion in the longitudinal direction of the upper surface 3 of each precast concrete block 1a and 21a forming the connecting body 1b. A recessed portion 3a is provided. Similarly, side recesses 4c are also provided at the ends in the longitudinal direction of the lower portions of the upper inclined surfaces 4b of the side surfaces 4 of the precast concrete blocks 1a and 21a. On the other hand, the bolt 1c is erected in the concrete of the upper surface recessed portion 3a and the side surface recessed portion 4c. Thus, each precast concrete block 1a and 21a in which the upper surface recessed part 3a and the side surface recessed part 4a were formed is laid between the road plates 11 and 11 as the connection body 1b. The connecting body 1b of the precast concrete blocks 1a and 21a is connected by the fitting of the above-mentioned convex strips 7a and concave strips 28a. Further, as shown in FIG. 11, between the bolts 1c of the upper surface recessed portions 3a of the adjacent precast concrete blocks 1a and 21a and the bolts 1c of the side surface recessed portions 4c as shown in FIG. Each bolt 1c is passed through a steel connecting plate 1d having a bolt hole for joining shown in FIG. 15, and screwed with nuts 1e and 1e, and adjacent precast concrete blocks 1a and 21a are connected to form a connecting body 1b. 11 (a) and integration as shown in FIG. FIG. 13 shows a state where the precast concrete guard fence 1 made of the connecting body 1b is placed between the left and right road slabs 11 of the viaduct. Further, as shown in FIGS. 14 (a) and 14 (b), the precast concrete blocks 1a and 21a have longitudinal protrusions and recesses on one block end surface 7 and the other block end surface 8. Both are flat. However, also in this case, the precast concrete blocks 1a and 21a are joined to each other by the steel connecting plate 1d to form the connecting body 1b.

  In the example of the embodiment shown in FIG. 7 or FIG. 8, the gap 10 on the lower surface 2 of the precast concrete block 1 a has a gap 10 that also serves as a water stop extending downward from the center of the groove 5 or made of concrete. The misalignment 10a is fitted in the groove 5. The concrete shift stopper 10a which also serves as a cap-shaped water stop has a protrusion 10b on the lower surface. In the example shown in FIG. 7, the ridge 10 b is inserted and locked in the gap 13 between the left and right viaduct road slabs 11 for the up and down traveling route. Therefore, in the example of FIG. 7, the width of the gap 13 is narrow, and it is preferable that the single ridge 10 b fits into the width of the gap 13. On the other hand, in the example shown in FIG. 8, the width of the gap 13 between the left and right viaduct road slabs 11 for the up and down travel route is wide. When this width is wide, the cap-shaped concrete misalignment 10a is formed on the back surface of one cap-shaped concrete misalignment 10a, as shown in FIGS. 8 (b1) and (b2). Further, ridges 10b having a length of ½ are alternately arranged on the side portions, and the left and right road slabs 11 as shown in FIG. , 11 so as to fit in the gap 13 without any gap. On the other hand, what is shown in (c1) and (c2) of FIG. 8 is that this cap-shaped concrete misalignment 10a has a length of ½. The length of the concrete displacement stopper 10a is connected to the ridges 10b by reversing the left and right alternately, and a pair of concrete displacement stoppers 10a. In the concrete guard fence 19, the traveling vehicle is mistakenly made of concrete. When it collides with the guard fence 19, the impact load 30 acts on the concrete guard fence 19, and the wheel load 31 acts on the road slab 11. That is, each acts in the direction shown in FIG. The widths of the gaps 13 are ensured by alternately fitting the protrusions 10b on the lower surface of the two concrete displacement stoppers 10a.

  When these cap-like displacement stoppers 10 or concrete displacement stoppers 10a are inserted into the gaps 13 between the left and right viaduct road slabs 11 for the up-and-down traveling route and locked, these displacement stoppers 10 or A waterproof seal 10c made of rubber plate is interposed between the concrete plate 10a and the road plate 11, and rain water or the like flows into the gap 13 between the left and right road plates 11, 11. It is preventing. The water stop seal 10c made of a rubber plate inserted between the cap-like displacement stopper 10 of the precast concrete block 1a or the concrete displacement stopper 10a and the upper surface of the road slabs 11 and 11 is the weight of the precast concrete block 1a. It is latched between the left and right viaduct road slabs 11 for the up-and-down traveling route.

  In these embodiments, the precast concrete block 1a includes the cap-shaped concrete displacement stopper 10a made of the downward protruding ridge 10b fitted in the straddle-shaped concave groove 5 on the lower surface 2 of the precast concrete block 1a. The weight of the precast concrete block installed on each conventional road slab is approximately twice that of the precast concrete block, and the precast concrete guard fence 1 formed continuously from the precast concrete block 1a is difficult to move due to a vehicle collision. Furthermore, the precast concrete guard fence 1 which is hard to move further is formed by the protruding strips 10b protruding downward from the cap-shaped concrete displacement stopper 10a. Therefore, the precast concrete guard fence 1 is not easily moved to the opposite lane, and the occurrence of accidents by obstructing the passage of vehicles in the opposite lane is extremely reduced.

  When a traveling vehicle accidentally collides with these precast concrete blocks 1a, the impact load 30 acts on the precast concrete block 1a in the direction of the arrow, and the wheel load 31 acts on the road slab 11 in the direction of the arrow. The bending load 32 is applied to the road slab 11. By the way, since the bottom of the precast concrete block 1a of the means of the present invention is placed on the upper surface of each road slab 11 across the gap 13 between the upper and lower road slabs 11, these combined bending loads 32 are provided. Is applied to the colliding road slab 11 in the direction of the arrow and also to the opposite road slab 11 in the direction of the arrow. That is, unlike the one-side bending load 32 in the case of the conventional concrete guard fence 19 shown in FIG. 17, the bending load 32 in the case of the precast concrete block 1a of the present invention is opposite to the road plates 11, 11. Therefore, the two cancel each other out, so that the precast concrete block 1a is not easily toppled and thus is difficult to move.

  When the precast concrete guard fence 1 of the present invention is installed in the gap 13 of the road slab 11 of the vertical traveling route, there is a difference in surface height between the left and right viaduct road slabs 11 and 11 for the vertical traveling route. In some cases, the vibration absorbing rubber plate 9a placed on the surface of the road slab 11 with the lower viaduct is thicker or the concrete is applied to the surface of the road slab 11 It shall be installed after equalizing the height of the road plate 11.

  By the way, when the precast concrete guard fence 1 of the present invention is installed on the left and right viaduct road slabs 11 and 11, first, as shown in FIG. After the construction of the road surface 12 is completed, the precast concrete guard fence 1 is installed on the asphalt pavement 12. When the precast concrete guard fence 1 of the present invention is installed on the asphalt pavement 12 after the asphalt pavement 12 is constructed in this way, the construction method is simple because it is only necessary to install the precast concrete guard fence 1. Yes, its construction cost is low.

  Of course, as shown in FIG. 4, the precast concrete guard fence 1 is installed on the left and right viaduct road slabs 11, 11, and then a pavement 12 such as asphalt is constructed on the left and right road slabs 11, 11. It goes without saying that can be completed. However, in this case, the precast concrete guard fence 1 is first installed on the viaduct 11 and 11 and then the asphalt pavement 12 is constructed on the both sides 11 and 11. Since it is necessary to adjust the time, it takes time, and this increases the construction cost.

  The precast concrete guard fence 1 of the present invention described above is installed in a manner that the precast concrete block 1a is placed and connected and integrated without being fixed to the viaduct 11 with an anchor bolt as in the prior art. Therefore, the time required for construction can be performed in an extremely short time. Therefore, there is an advantage that the construction can be performed at a time when the traffic volume is relatively small such as at night. Further, the precast concrete guard fence 1 has the concrete block 1a of the present invention having a weight more than twice that of the conventional concrete block, and is connected to the connecting body 1b from a plurality of the heavy concrete blocks 1a. Since it is integrated and has a length of at least 14 m, the total weight exceeds 18 tons, and it is difficult for the precast concrete guard fence 1 to be moved to the opposite lane due to a collision.

1 is an end view of a precast concrete guard fence placed on the ground cover of a viaduct of the present invention. It is an end view of the guard fence made from the precast concrete of another form mounted in the ground cover of the viaduct of the viaduct of this invention. It is a top view of the guard fence made from a precast concrete mounted in the viaduct of the viaduct of this invention. 1 is an end view of a precast concrete guard fence placed by removing the ground cover of a viaduct road plate according to the present invention. FIG. It is a top view explaining the connection state of the precast concrete block of this invention. It is a perspective view which shows the viaduct which mounted the guard fence made from the precast concrete of this invention. It is an end elevation which shows the guard fence made from the precast concrete mounted in the viaduct of the viaduct of the other form of this invention. (A) of an end view showing a guard fence made of precast concrete placed on a viaduct road bridge according to still another embodiment of the present invention, a perspective view (b1) of a cap-shaped concrete displacement stopper, and a cap of another embodiment It is a perspective view (b2) of the slip stopper made of concrete. It is an end elevation which shows the guard fence made from a precast concrete which has the gap stop of the steel plate mounted in the viaduct road bridge of the further another form of this invention. It is an end elevation of the guard fence made from precast concrete laid in the viaduct roadside plate of the present invention of other forms. It is a top view explaining the connection state of the precast concrete block of the further another form of this invention. It is a perspective view explaining the connection state of the precast concrete block of the other form of this invention. It is a perspective view which shows the viaduct which mounted the guard fence made from the precast concrete of the other form of this invention. It is a top view explaining the connection state of the precast concrete block of the further another form of this invention. It is a top view which shows the steel connection plate and hex nut which connect the precast concrete of this invention. It is an end view of the conventional guard fence made from a steel plate. It is a figure which shows the load concerning the conventional guard fence made from concrete. It is a figure which shows the load which concerns on the precast concrete block of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Precast concrete guard fence 1a Precast concrete block 1b Connecting body 1c Bolt 1d Steel connection plate 1e Nut 1f PC steel rod insertion hole 1g PC steel rod 1h Steel rib plate 1i Steel jacket 2 Lower surface 3 Upper surface 3a Upper surface recess 4 Side surface 4a Lower inclined surface 4b Upper inclined surface 4c Side recessed portion 5 Concave groove 6 Horizontal surface 7 One block end surface 7a Convex strip 8 Other block end surface 8a Concave strip 9a Vibration absorbing rubber plate 9b Grout 10 Displacement 10a Concrete displacement 10b ridge 10c water stop seal 10d steel plate 11 road plate 11a ground cover 12 pavement 13 gap 14 maximum width 15 minimum width 16a groove width 16b groove height 17 pole 18 steel guard guard 19 concrete guard fence 20 an Boruto 21a adjacent precast concrete block 28 other block end face 28a concave 29 engaging direction 30 impact load 31 wheel load 32 bending load

Claims (8)

  It has a bottom surface with a maximum width, a top surface with a minimum width, and both side surfaces consisting of a gradual lower inclined surface and a steep upper inclined surface following the lower inclined surface. A connecting body having a straddle-shaped concave groove, a vibration-absorbing rubber plate disposed under the lower surface, and a stationary precast concrete block placed in a longitudinal direction across the gap between the upper and lower road plates A guard fence made of precast concrete for a median strip installed in a straddling manner on the upper and lower slabs of a viaduct on a motorway characterized by comprising   The deferred precast concrete block that has a concave groove in the longitudinal center of the bottom surface of the maximum width and straddles the gap between the upper and lower slabs is connected to the gentle lower inclined surface of the precast concrete block and its upper part. A steel jacket composed of a plurality of steel rib plates similar to the cross-sectional shape perpendicular to the longitudinal direction of the lower part of the block is formed in the lower part of the block between both side surfaces of the lower region part of the steep upper inclined surface. 2. A guard fence made of precast concrete for a median strip installed in a straddle manner on a viaduct of a viaduct of an automobile road according to claim 1, characterized in that the guard fence is embedded in the direction at equal intervals.   The straddle-shaped concave groove has a height and a width capable of being fitted with a joint grout around a ground cover obtained by partially cutting an upper part of the upper and lower road plates. Item 3. A guard fence made of precast concrete for a median strip installed in a straddle manner on the upper and lower slabs of a viaduct of an automobile road according to item 1 or 2.   The straddle-shaped concave groove cuts the ground cover standing upright at each end of the upper and lower road slabs, and replaces the cut ground cover with a projecting ridge engaging the gap between the upper and lower road slabs on the lower surface. 3. A median strip installed on the upper and lower slabs of the viaduct of a motorway according to claim 1 or 2, wherein a cap-like water stop and slip stopper made of metal are fitted into the inside of the groove. Guard fence made of precast concrete.   The straddling concave groove cuts the ground cover standing upright at each end of the upper and lower path plates, and replaces the cut ground cover, perpendicular to the gap between the upper and lower path plates below the upper block center. 3. A guard fence made of precast concrete for a median strip installed on the upper and lower slabs of a viaduct of a motorway according to claim 1 or 2, characterized by having a misalignment made of a steel plate to be inserted.   The connecting body in which the precast concrete blocks are continuously provided in the longitudinal direction is formed by connecting the adjacent precast concrete blocks to each other by inserting a PC steel rod in the longitudinal center of each precast concrete block. A guard fence made of precast concrete for a median strip installed in a straddle manner on the viaduct of the viaduct of the automobile road according to any one of claims 1 to 5.   A connecting body in which precast concrete blocks are continuously provided in the longitudinal direction is composed of a plurality of precast concrete blocks having a ridge on one block end surface in the longitudinal direction and a recess on the other block end surface. It is formed from a plurality of precast concrete blocks connected in the longitudinal direction by engaging convex grooves on the block end surface in the longitudinal direction of the block with concave grooves on the block end surface in the longitudinal direction of the adjacent precast concrete block. A precast concrete guard fence for a median strip installed in a straddle manner on a viaduct plate of a viaduct of an automobile road according to any one of claims 1 to 6.   The precast concrete block constituting the connecting body has an upper recessed portion formed at the center of the upper surface of the longitudinal end portion of the precast concrete block and a side recessed portion formed at the lower portion of the longitudinal inclined end portion of the upper inclined surface of the side surface of the precast concrete block. And an upper recessed portion formed at the center of the upper surface of the longitudinal end portion of the adjacent precast concrete block and a side recessed portion formed at the lower portion of the longitudinal end portion of the upper inclined surface of the side surface of the adjacent precast concrete block. The precast concrete for the median strip installed in a straddle on the upper and lower slabs of the viaduct of the automobile road according to any one of claims 1 to 7, wherein the precast concrete is connected by a steel connection plate Guard fence made of.

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