JPH1121823A - Execution structure of central separation zone - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the execution structure of a central separation zone which can shorten a term of work by far in comparison with a usual term and execute a work more simply and with an excellent outward appearance. SOLUTION: A hardened ground leveling layer 3 is executed in the execution area of a central separation zone, and flat plate-shaped foundation blocks 2 are spreadly provided on the ground leveling layer 3 along roadways on both sides in mutually parallel arrangement, and separation zone blocks 1 are arrangedly spread on each parallel foundation block 2. The adjacent foundation blocks 2 and the adjacent separation zone blocks are desirably mutually connected, and in addition, a joint between the foundation blocks 2 and a joint between the separation zone blocks are also desirable to be arranged at different positions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction structure of a median strip on a road.

[0002]

2. Description of the Related Art A conventional median strip is shown in FIGS.
It is constructed as shown by. First, a groove is excavated between the roads a, a on both sides along the roads a, a ground leveling layer 3 hardened by laying crushed stone or gravel is formed at the bottom of the excavated portion, and then the foundation concrete layer is formed. 70 is cast.

[0003] After the foundation concrete layer 70 has solidified, a separator block 7, 7 is placed on the foundation concrete layer 70.
Are continuously laid in parallel with a predetermined interval. On this occasion,
An empty mortar layer containing a mixture of sand and cement is interposed between the foundation concrete layer 70 and each of the separation zone blocks 7.
Separation blocks 7 arranged in the longitudinal direction are jointed with mortar 7
Connect by two. Form plates 73 are respectively installed on the side portions of the respective parallel strip blocks 7 on the side of the road a in parallel with and separated from the separated strip blocks 7 by a predetermined distance. The apron concrete 71 having a substantially uniform thickness is cast between the apron concrete 71 and the apron concrete 73.

[0004] The upper surface of the apron concrete 71 is finished with a trowel. And apron concrete 7
When 1 is solidified, the form plate 73 is removed, crushed stone or gravel (not shown) is packed between the roadway a and each apron concrete 71 and solidified, and then covered with asphalt (not shown).

[0005]

According to the conventional construction structure of the median strip described above, several days (about one week) until the foundation concrete layer 70 solidifies, and several more days until the apron concrete 71 solidifies. Days (about one week), a long construction period was required. Until the foundation concrete 70 and the apron concrete 71 solidify, it is necessary to surround the concrete casting area with an appropriate protective device and protect the concrete until they solidify. Further, as described above, it takes a long time for the poured concrete layer to solidify, and during that time, there is a problem in that it hinders vehicle traffic.

An object of the present invention is to significantly shorten the construction period as compared with the conventional construction structure,
An object of the present invention is to provide a construction structure of a median strip which can be constructed more easily and with good appearance.

[0007]

The construction structure of the median strip according to the present invention is constructed as follows to achieve the above-mentioned object. That is, in the construction structure of the median strip according to claim 1 of the present invention, the leveling layer 3 is constructed in the construction area of the median strip, and the flat base block 2 is placed on the road leveling layer 3 on the leveling layer 3. And the separator blocks 1 are arranged and laid on each of the parallel basic blocks 2.

[0008] The construction structure of the median strip according to claim 2 is the construction structure of claim 1, wherein the foundation block 2.
An empty mortar layer 4 in which sand and cement are mixed is interposed between the separator block 1 and the separator block 1.

According to a third aspect of the present invention, in the construction of the first or second aspect, the seam between the base blocks 2 and the seam between the separation block 1 are arranged at different positions. is there.

According to a fourth aspect of the present invention, there is provided the construction of the median strip according to any one of the first to third aspects, wherein the adjacent base blocks 2 and the adjacent divider blocks 1 are connected to each other. It is characterized by. In order to connect the blocks 2 and 2 or the blocks 1 and 1 to each other, for example, at the both ends of the block, a nut is embedded in the side of the block when molding them, and when arranging the blocks, it is adjacent. A bolt is screwed to the nut via a connecting plate also serving as a washer at the end of each matching block. However, they may be connected by other means.

According to a fifth aspect of the present invention, there is provided a construction of a median strip according to any one of the first to fourth aspects, wherein the base block 2 and the divider block 1 thereon are at least partially one of one. Are fitted to the other.

According to a sixth aspect of the present invention, in the construction structure of the median strip according to any one of the first to fifth aspects, at the end of the median strip, the end of the parallel base blocks 2 is provided. The ends are connected by a plane U-shaped end base block 2a, and the ends of the parallel separation block 1, 1 are flat U-shaped end separation bands laid on the end base block 2a. It is characterized by being continuous by the block 1a.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a construction structure of a median strip according to the present invention will be described with reference to FIGS. First Embodiment FIGS. 1 to 7 show a construction structure of a median strip according to a first embodiment. 1 is a partial perspective view showing a main part of the construction structure of the median strip, FIG. 2 is a partially enlarged sectional view of the construction structure of FIG. 1, FIG. 3 is a partially enlarged sectional view of a connecting portion between the basic blocks, and FIG. FIG. 5 is a partially enlarged perspective view of the separation band block, FIG. 6 is a partial plan view showing the construction of the end of the central separation band, and FIG. 7 is an arrow AA in FIG. FIG.

As shown in FIGS. 1 and 2, first, a separation zone construction area between the roads a, a is excavated in a groove shape parallel to the road a, and crushed stone or gravel is laid on the excavated portion so that the upper surface is flat. The ground leveling layer 3 which is hardened so as to be constructed. Next, flat base blocks 2 are laid in two rows on the upper surface of the terrain layer 3 constructed as described above so as to be parallel to each other along the road a. Both end portions of the adjacent basic blocks 2 are connected at portions facing both sides in the length direction when the basic blocks 2 are arranged.

As shown in an enlarged manner in FIG. 3, concave portions 50 are formed on both sides of both ends of each basic block 2 so as to face both sides. Nut 51 is embedded. The material of the nut 51 is high-density polyethylene, and a reinforcing rib 52 is formed on the outer periphery in the circumferential direction and the length direction. And
When connecting the basic blocks 2 to each other, a metal connecting plate 5a also serving as a washer inserted into the recess 50 is used.
The bolts 5 are screwed into the nuts 51.

On the foundation block 2 laid as described above, an empty mortar layer 4 having a thickness of about 20 mm in which sand and cement are mixed at a predetermined ratio without adding water is laid. The separator strips 1 are laid on the layer 4 in a state of being arranged in a line. When the separation band block 1 is laid, the empty mortar layer 4 is compressed to a thickness of about 10 mm by the weight of the separation band block 1. As described above, by laying the separation band block 1 on the base block 2 with the empty mortar layer 4 interposed therebetween, the unevenness on the bottom surface of the separation band block 1 is adjusted, and the standing is improved. That is, the separator block 1 is a precast material, is formed in a state where the top and bottom are reversed, and the bottom surface which becomes upper at the time of molding is slightly uneven. The unevenness of the bottom surface of 1 is adjusted to improve its installation.

As shown in FIG. 5, each separation strip block 1 is formed with a similar recess 50 at a position similar to that of the base block 2 shown in FIG. Are embedded respectively. Therefore, the separation strip blocks 1 are connected to each other by the connecting plates 5 a and the bolts 5, similarly to the base blocks 2. On the upper surface of one end of each separation strip block 1, a joint cutout 1
When the separation band blocks 1 are laid side by side as described above, the joint cutouts 11 are provided with joint materials 12 made of, for example, an elastic porous material made of polypropylene.
Is packed.

The separation block 1 and the base block 2 have the same plane shape and the same plane size.
, An apron portion 10 is integrally formed toward the road a. The seams between the base blocks 2 and the seam blocks 1 are constructed so as to be arranged at different positions, and are preferably constructed so as to be staggered along the longitudinal direction. By such a construction, it is possible to prevent unevenness (unevenness or level difference) between the separation band blocks 1 appearing on the surface. Reinforcing bars (not shown) are arranged vertically and horizontally on the base block 2, the separation band block 1, and the end base blocks 2a and the end separation block 1a to be described later.

Nuts 51 embedded in recesses 50 formed at the ends of base block 2 and separator block 1
In order to prevent dust, sand and other foreign matter from entering the inside during storage in a factory or storage in a pile, it is preferable to cover with a screw cap 5b as shown in FIG.
In this embodiment, the embedded nut 51
Is used as a mounting part for eye bolts and hook bolts (not shown) because the blocks 1 and 2 are suspended and transported or moved by a transporter (not shown) equipped with a small crane or hoist.

The median strip is constructed in a state where the vehicle makes a U-turn or moves from the road to another road, and is cut off at a required portion over a predetermined length range. In such a case, as shown in FIG. 6 and FIG. 7, the ends of the base blocks 2 and 2 and the separation block 1, which are continuously laid in parallel in the manner described above,
The cross-sectional shape and cross-sectional size are the same as each block 2 and 1,
The end base block 2a and the end separator block 1a formed into a flat U shape are connected to each other. That is, the recess 50 similar to the both sides of the end of the base block 2 and the both sides of the end of the separator block 1 is provided on both sides of the end of the end base block 2a and both sides of the end of the separator strip block 1a. Is formed, and a nut 51 is provided at the bottom of the concave portion 50.
A bag-shaped nut similar to the above is embedded. Therefore, the end of each basic block 2, 2 and the end basic block 2
The corresponding end portions of a and the corresponding end portions of the separation strip blocks 1 and 1 and the end separation strip block 1a are connected by the connection plates 5a and the bolts 5 and 5, respectively. The end base block 2a is laid on the leveling layer 3 constructed in the relevant part, and the end base block 2a
On top of this, an end separator block 1a is laid via an empty mortar layer 4.

The joint between the base block 2 and the end base block 2a, the separation block 1 and the end separation block 1a
7, the end of the end base block 2a is formed longer than the end of the end separator block 1a as shown in FIG. A bag-shaped nut 6 having the same structure as the nut 51 of the concave portion 50 of each of the blocks 2 and 1 is embedded in the arc-shaped protruding end of the end separation band block 1a and the end base block 2a in an outer circumferential direction. The nut 6 is covered with a screw cap (not shown). If necessary, the screw cap is removed, an eye bolt or a hook bolt (not shown) is attached to the nut 6, and the blocks 1a and 2a are suspended and transported. It is configured to be able to.

As described above, the base block 2 and the separation block 1 are arranged side by side on the leveling layer 3 serving as a base, and are laid in parallel with each other. The end block 2a and the end separation block 1a terminate the base block 2 and the separation band block 1a. By connecting the basic blocks 2 and 2 and the separation block 1 and 1 at the end,
The basic part of the construction of the median strip is completed. Thereafter, crushed stones and gravel (not shown) are packed into the excavation spaces on both sides of the overlapping blocks 2 and 1 and solidified, and the upper surface on the side of the roadway a is packed with asphalt and the like (not shown). The construction of the median strip is completed by constructing a fence of an appropriate height between the two or by implanting a hedge between the two.

According to the construction structure of the above-described embodiment, it is not necessary to pour ready-mixed concrete at the time of construction. Since it does not require a coagulation period,
The construction period is much shorter than the conventional construction structure. Even when the construction and repair work of the median strip is performed at night, it can be completed almost overnight, and there is no need for work such as protection and curing of the ready-mixed concrete placing portion.

Since the base block 2 and the separator block 1 have the same length and are arranged alternately along the roadway, the construction is easier and the unevenness (unevenness or step) of the front separator block is reduced. It is unlikely to occur.

Since the adjacent basic blocks 2 and the adjacent separation band blocks 1 are connected, for example,
By connecting while laying the 1 side by side,
The blocks 2 and 1 that have already been laid are less likely to move, so that the blocks can be constructed more smoothly and smoothly. The nuts 51 of each of the base blocks 2 and each of the separation band blocks 1 also serve as mounting portions for eye bolts, hook bolts, and the like. It is easy to transport and very convenient for laying and removing them. Further, since the nut 6 is embedded in the arc-shaped protruding end of the end base block 2a or the end separation block 1a, the nut 6
By attaching eyebolts and hook bolts,
The blocks 2a and 1a are easily handled and transported, and are very convenient for laying and removing the blocks.

In the conventional construction structure, when the apron concrete 71 is cast and the upper surface is trowel-finished, the cement particles having small particles in the mortar and having a large specific gravity easily sink into the lower layer, so that the surface becomes rough. Poor appearance. On the other hand, the precast material such as the separator block 1 of this embodiment is molded upside down during molding, and more of the small particle portion appears on the upper surface. The structure is much cleaner in appearance than the conventional construction.

Another Embodiment FIGS. 8 and 9 show another embodiment. A concave portion 20 is formed on the upper surface of the basic block 2 in FIG. 7. An empty mortar layer 4 is laid in the concave portion 20, and the separator block 1 is laid on the empty mortar layer 4. It is configured so that it sinks slightly and its bottom fits into the recess 20. The height of both side edges 22 of the basic block 2 in the figure is substantially the same, and when the empty mortar layer 4 is laid in the concave portion 20, a not-shown drawing made of a rod or a plate is brought into contact with the both side edges 22. The upper surface of the empty mortar layer 4 can be easily and uniformly leveled by smoothing. A recess 13 is formed on the bottom surface of the separator block 1 in the embodiment of FIG. 9, and a protrusion 21 is formed on the upper surface of the base block 2 so as to fit into the recess 13 after construction.

In the embodiment shown in FIGS. 8 and 9, one of the base block 2 and the separator block 1 on the base block 2 fits into the other. Even when more external force is applied, it is possible to prevent the separation block 1 and the base block 2 from shifting.

In the construction structure of the median strip according to the present invention, it is possible to connect the foundation block 2 and the median strip block 1 thereon. The specific means of connection can be configured in substantially the same manner as in the first embodiment. As described above, if the base block 2 and the separator block 1 on the base block 2 are connected to each other, for example, while laying the base block 2 and the separator band block 1 in an overlapping state, By connecting, the upper and lower blocks 1 and 2 which have already been laid are less likely to move, and the construction can be performed more conveniently and smoothly.

In the present invention, the means for connecting the blocks 1 or 2 is not limited to the above-described structure.
For example, there is no problem even if the adjacent blocks 1 (or 2) are fitted by unevenness.

[0031]

According to the construction structure according to the first aspect of the present invention, since it is not necessary to pour ready-mixed concrete at the time of construction, the construction is much simpler than the conventional construction structure. Since the solidification period of the ready-mixed concrete is not required, the construction period is much shorter than in the conventional construction. Even when the construction and repair work of the median strip is performed at night, it can be completed almost overnight, and there is no need for work such as protection and curing of the ready-mixed concrete placing portion. In the conventional construction structure, when the apron concrete 71 is cast and the upper surface is trowel-finished, a portion of cement having a small particle and a large specific gravity easily sinks in a lower layer, so that the upper surface is roughened and the appearance is inferior. On the other hand, the precast material such as the separator block 1 in claim 1 is molded upside down during molding, and a larger number of small particle portions appear on the upper surface. The structure is much cleaner in appearance than the conventional construction.

According to the construction structure of the second aspect, the empty mortar layer 4 is provided between the base block 2 and the separation block 1.
Therefore, even if there is some unevenness on the bottom surface of the separation band block 1 which is a precast material, the unevenness is absorbed and the separation band block 1 can be set well.

According to the construction structure of the third aspect, the joint between the base blocks 2 and the joint between the separation band blocks 1 are constructed so as to be arranged at different positions. It is possible to prevent unevenness (unevenness or level difference) from occurring between them, and it is possible to carry out the work in a good format.

According to the construction structure of the fourth aspect, since the adjacent base blocks 2 and the adjacent separation block 1 are connected to each other, for example, the blocks 2 and 1 are connected while being laid in a line. This makes it difficult for the already laid blocks 2 and 1 to move, so that the blocks 2 and 1 can be constructed satisfactorily and smoothly.

According to the construction structure of the fifth aspect, the base block 2 and the separator block 1 on the base block 2 are configured such that at least one of them fits into the other.
Even if the separator block 1 receives side pressure during construction,
The base block 2 and the separator block do not shift.

[0036] According to the construction structure of the sixth aspect, at the end of the median strip, the parallel foundation blocks 2 and 2 are arranged.
Are connected by a flat U-shaped end base block 2a, and the ends of the parallel separation strip blocks 1, 1 are flat U-shaped ends laid on the end base block 2a. Since the end portion is continuous by the separation band block 1a, the end portion can be finished easily, easily and easily.

[Brief description of the drawings]

FIG. 1 is a partial perspective view showing a main part of a construction structure of a median strip according to a first embodiment.

FIG. 2 is a partially enlarged sectional view of the construction structure of FIG.

FIG. 3 is a partially enlarged cross-sectional view of a connecting portion between foundation blocks in the construction structure of FIG. 1;

FIG. 4 is an enlarged perspective view of an embedded nut in a connection portion between blocks in the construction structure of FIG. 1;

FIG. 5 is a partially enlarged perspective view of a divider block in the construction structure of FIG. 1;

FIG. 6 is a partial plan view showing the construction structure at the end of the median strip.

FIG. 7 is a partial sectional view taken along arrow AA of FIG. 6;

FIG. 8 is a side view showing an overlapping state of a base block and a separator block in another embodiment.

FIG. 9 is a side view showing another example of the overlapping state of the basic block and the boundary block in still another embodiment.

FIG. 10 is a partial sectional view of a conventional median strip in an installed state.

FIG. 11 is a partial perspective view showing a construction concept of a conventional median strip.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Separation zone block 1a End separation zone block 10,10a Apron part 11,11a Joint cutout part 12 Joint material 13 Concave part 2 Basic block 2 End part basic block 20 Concave part 21 Convex part 3 Leveling layer 4 Empty mortar layer 5 Bolt 5a Connecting plate 5b Screw cap 50 Recess 51 Nut 52 Reinforcement rib 6 Nut 7 Separator block 70 Basic concrete layer 71 Apron concrete 72 Joint mortar 73 Form plate a Roadway

Claims (6)

[Claims] 1. A leveling layer 3 is constructed in a construction area of a median strip, and flat foundation blocks 2 are laid on the leveling layer 3 in parallel along roadways on both sides thereof. A construction structure for a median strip, wherein the divider blocks 1 are arranged and laid on the block 2. 2. An empty mortar layer 4 containing a mixture of sand and cement between the base block 2 and the separator block 1.
The construction structure of the median strip according to claim 1, wherein an intermediate member is interposed. 3. The construction structure of a median strip according to claim 1, wherein the joint between the base blocks 2 and the joint between the divider blocks 1 are arranged at different positions. 4. The construction structure of a central divider according to claim 1, wherein adjacent basic blocks 2 and adjacent divider blocks 1 are connected to each other. 5. The base block 2 and the separator block 1 thereon have at least one part fitted into the other,
The construction structure of the median strip according to any one of claims 1 to 4. 6. At the end of the median strip, the ends of the parallel base blocks 2, 2 are connected by a plane U-shaped end base block 2a, and the ends of the parallel base blocks 1, 1 are closed. 6. The median strip according to any of claims 1 to 5, characterized in that the sections are connected by a flat U-shaped end strip block 1a laid on the end base block 2a. Construction structure.