JP2003247202A - Technique for preventing peeling of pavement around structure such as manhole cover supporting frame - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the durability of a pavement around a structure such as a supporting frame by improving adhesion between a pavement material and the structure such as the supporting frame. <P>SOLUTION: The technique for preventing the peeling of the pavement around the structure such as the manhole cover supporting frame comprises a first step of installing a formwork 18 outside the structure 11 to be encircled with a space 19 being kept as required and filling a special pavement material 23 using thin aggregates into at least the surface layer, appearing on a road, of the space 19 between the structure 11 and the formwork 18 to construct a peeling preventing portion 24 and a second step of filling a general pavement material 26 around the peeling preventing portion 24 to construct a general road surface 27. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing peeling of a pavement around a structure existing on a road surface such as a manhole cover receiving frame.

[0002]

2. Description of the Related Art As a manhole installed on a road in a snowfall area, there is a manhole in which a snow removing blade of a snow removing vehicle is not caught. For example, Japanese Patent No. 2581658 (JP-A-8-12)
The invention of No. 0701) discloses a receiving frame having an inclined surface whose outside is lowered in order to deflect the external force acting on the mouth frame portion upward. The receiving frame also provides a solution to the problem that the shaped portion of the receiving frame of the registered No. 786357 design has a curved surface with a large radius, so that the asphalt cannot sufficiently cover the receiving frame. This is because the asphalt can sufficiently cover the receiving frame in the inclined surface portion where the outside is lowered.

On the other hand, the asphalt pavement material contains mineral aggregate such as crushed stone and gravel, and the particle diameter of these aggregates is in the range of about 5 to 10 mm, and the amount is more than 90% by weight. Up to. Such an aggregate has a weak adhesive force to the shaping portion of the receiving frame, and cannot repeatedly bear the strong snow cutting force of the snow removing blade, resulting in peeling of the pavement around the receiving frame. As a repair construction method for such damage around the manhole,
Japanese Patent No. 2620817 (JP-A-4-131407)
It has been known. This method is a method of excavating and removing the bituminous pavement around the existing manhole and applying the cement concrete mixture, the bituminous emulsion mixture using coarse-grained aggregate, and the bitumen emulsion mixture using fine-grained aggregate in the same order. Is disclosed.

However, in the above repair method, the bituminous emulsion mixture using coarse-grained aggregate is paved and shaped on the filling surface of the cement-concrete mixture to the surface height of the manhole, and the upper surface of the mixture and the existing bituminous pavement. Since the surface treatment is performed with a bituminous emulsion mixture using fine grain size aggregates including the adjacent upper surface, the bituminous emulsion mixture using fine grain size aggregates can be heaped up higher than the existing bituminous pavement. Become. It is described in the example that a surface treatment layer having a thickness of about 5 mm was provided after compacting, and as shown in FIGS. 2 and 3. Therefore, the location where this repairing method is applied is about 5 mm higher than the existing road surface, which creates a step, which gives a shock to the vehicle when there is no snow, and the height of this step increases when snow is removed from the snow. You must give resistance to the blade, and in some cases, you must think that the snow blade may get caught.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned points, and its object is to improve the adhesiveness between a pavement material and a structure such as a receiving frame, and to perform paving around a structure such as a receiving frame. Is to increase the durability of. Another object of the present invention is to realize a highly durable pavement by smoothly finishing the boundary between the special pavement material and the general pavement material, and also to provide a shock shock to the vehicle regardless of whether it is snowy or snowless. Is not to give. Since the traveling shock also repels the structure such as the manhole cover receiving frame as a load, the smoother the pavement around the structure is, the better.

[0006]

In order to solve the above-mentioned problems, the present invention relates to a method for preventing peeling of the pavement around a structure existing on the road surface such as a manhole cover receiving frame. A formwork is installed so as to enclose and maintain the required space between and, and at least the surface layer of the space between the structure and the formwork is filled with a special paving material using fine aggregate. The method includes a first step of constructing a peeling prevention portion and a second step of thereafter filling a general pavement material around the peeling prevention portion to construct a general road surface.

The above-mentioned means reverses the steps after the formwork is installed and fills the outside of the formwork with a general pavement material to construct a general road surface, and then the constructed general road surface and structure. At least on the surface layer of the space between things,
A second step of filling a special pavement material using fine aggregate to construct a peeling prevention portion may be used.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The construction method according to the present invention relates to prevention of peeling of pavement around structures existing on a road surface such as a manhole cover receiving frame. In the present invention, the structure existing on the road surface is used as a structure existing as a part of the road surface, and various manholes, handholes and other (inspection) lid devices, structures crossing the road, roads Including the boundary area with the structure or the bridge part in parallel with.

Further, in the present invention, when it is called pavement,
It shall mean asphalt pavement. Asphalt pavement can be said to be a pavement consisting of a surface layer of mineral aggregate, which is hardened and coated with asphalt, also called asphalt cement, on a support layer. Note that this type of asphalt is also called asphalt mixture, which means a paving material that is a mixture of the asphalt body and aggregate.

Generally, an asphalt mixture is laid on a road surface at a high temperature of about 150 ° C. and is compacted from above by a vibration device called a rammer or a compactor. The general pavement material used in the present invention also has this. You can think of it as pointing.
On the other hand, there is special asphalt mixture,
Since it is gradually hardened by the mixing of the hardened resin, the surface can be leveled with a plastering iron until it solidifies, and it can be considered that the special paving material used in the present invention contains this. There are two types of special asphalt mixture materials, a thermosetting type and a room temperature curing type, and any type of the present invention can be used. The special paving material is not limited to the asphalt mixture, but resin mortar, non-shrink fast-hardening mortar, etc. may be used. When scraped off, resin mortar and non-shrink fast-curing mortar are mixed as dissimilar materials in the scrapped scrap material, and it becomes impossible to recycle the regenerated asphalt mixture to be reused after the asphalt reprocessing.

Further, in the non-shrinkage quick-hardening mortar, the receiving frame R
The upper part of the shape has a mortar thickness of 0 mm, and unlike flexible asphalt, it is a rigid body, so cracks easily occur. Generally, 1 cm for non-shrink fast hardening mortar
It is said that if the thickness is not the above, the strength is not obtained and cracks are likely to occur. The fine aggregate in the present invention is a mixture made of sand or crushed stone and having a particle size of 0 mm to 2.5 mm. This is because when the aggregate is 1 mm or less, the strength tends to be insufficient, and when the aggregate is 3 mm or more, the adhesive force with the structure tends to be insufficient.

In the method of the present invention, a mold is first installed outside the structure so as to surround the structure with a required space. The formwork is a means for determining the area around the structure to be filled with the special paving material. As mentioned above, the smoother the pavement around the structure is, the better. However, the use of the formwork makes the seam of the pavement smooth, so it can be said that it also contributes to the above-mentioned purpose. Therefore, it is desirable that the form does not have an angular shape. The material of the mold can be arbitrarily selected.

After the formwork is installed outside the structure with a required space, the process of filling the inside of the formwork with the special paving material is preceded, or the outside of the formwork is provided with the general paving material. It is possible to select whether to precede the step of filling with. The step of filling the special pavement material using fine aggregate in the surface layer appearing at least on the road in the space between the structure and the formwork to construct the peeling prevention portion is the first step. That is the invention. In this case, the inside of the formwork, that is, the space between the structure and the formwork, can be filled with only the special paving material, but the special paving material using fine aggregate is necessary and sufficient for at least the surface layer appearing on the road. Since it is possible to fill only a certain amount, in that case, the lower layer is filled with a special paving material using small aggregates having a larger grain size.

After the completion of the first step, the formwork is removed and the second
However, whether or not the removal of the formwork is an indispensable condition, that is, whether or not the second process is performed with the formwork left, may be a constructionally selectable matter. . When the mold is removed and the subsequent process is performed, the portion constructed by the first process serves as a mold that divides the filling area when performing the second process. In the invention according to claim 1, the second step is
It is a step of filling a general pavement material around the separation preventing portion constructed in the first step to construct a general road surface.

On the contrary, in the invention according to claim 2,
The step of filling the outside of the formwork with a general paving material first to construct a general road surface is referred to as a first step. In the case of the invention according to claim 2, a required space is formed outside the structure, and this space directly serves as a region for filling the special paving material. That is, in the invention according to claim 2, at least the surface layer that appears on the road in the space between the general road surface constructed by the first step and the structure is filled with a special paving material using fine aggregate, Build a peeling prevention part. Also in this case, the special paving material can be configured as a single layer or a plurality of layers.

[0016]

The present invention will be described in more detail with reference to the embodiments shown in the drawings. 1 to 6 show a first embodiment of the invention according to claim 1, and in the drawings, 11 denotes a receiving frame as a structure existing on the road surface. The receiving frame 11 has an inclined surface 13 and a curved surface 14 on the outer side of the mouth frame portion 12, and in the flange portion 15, the upper end of the mouth frame portion serves as a road surface on the lower structural member 16 called a manhole inclined wall or the like. It is fixed via adjusting means 17 for adjusting to the same height.

FIG. 1 shows a stage in which a mold 18 is fitted and attached to the outer periphery of the receiving frame 11. The formwork 18 is a receiving frame 11
In the required space 19 between the mold and the form 18, special paving material 23
In the case of Example 1 in which is filled with, the ring-shaped one shown in FIG. 11 (a) made of a steel plate is used. The exemplified form 18 is made of two members of the same type, and the connecting piece portion 21 facing outward is bolted,
It is integrally assembled by a coupling tool 22 composed of a nut or the like. The form 18 is not limited to the one made of the above steel plate, and a foam made of a resin such as urethane can be used.

FIG. 2 shows a special paving material 23 using fine aggregate.
Shows the stage of filling the whole space. As the special paving material 23, a room temperature curing type asphalt emulsion material was used and filled in the space 19. At the time when the steps of FIG. 2 are completed, the receiving frame 11 is made of a special paving material 23 made of fine aggregate.
It can be seen that the peeling prevention portion 24 made of a donut is integrated, and the outer edge of the peeling prevention portion 24 is separated by a smooth mold 18 having no corners or irregularities (see FIG. 3).

Since the special paving material 23 is made of fine aggregate, the adhesiveness with the structure such as the receiving frame is improved, and the durability of the peeling preventing portion 24 is also improved, but it is stronger than the general paving material. In order to improve this, a support layer is constructed by using a special paving material using a small aggregate for the lower layer 25, and a surface layer 26 is constructed by using the special paving material 23 on the support layer. be able to. As a modified example of the first embodiment, FIGS.
An example of this is shown in. When the lower layer 25A and the surface layer 25B are formed in two steps, the surface layer 26 is desired to have a thickness of at least 10 mm or more, preferably 20 mm. Lower layer 2
For No. 5, a small aggregate having a relatively small grain size of 5 to 10 mm and an average grain size of 6 mm, but a large grain size was used as the fine aggregate.

After that, the mold 18 is disassembled and removed (FIG. 5), and the outer peripheral wall of the peel preventing part 24 is used as an inner mold around the peel preventing part 24 constructed in the previous step. Then, the general pavement material 26 is filled in to form the general road surface 27. Therefore, the general road surface 27 is in close contact with the peeling prevention portion 26 using the special paving material 23 constructed in the first step and the lower layer 25 thereof (see FIG. 6), and also the peeling prevention portion 26 By constructing the general road surface 27 after solidification, the smoothness of the boundary portion between the inner and outer regions is maintained.

Further, FIG. 7 and subsequent figures show a second embodiment of the invention according to claim 2 of the present invention. In the second embodiment, as already described, after the installation of the formwork 28, after the first step of filling the outside of the formwork 28 with the general paving material 26 to construct the general road surface 27, the constructed general road surface 27 and receiving frame 1 which is a structure
In this method, the space 19 between the space 1 and the space 1 is filled with the special paving material 23 to construct the peeling prevention portion 24. In this case, the form 28
11B is a ring-shaped member as shown in FIG. 11B, which is composed of two members, and the inward connecting piece portion 29 is integrally assembled by a connecting tool 30 formed of bolts, nuts and the like.

The form 28 is placed on the flange portion 15 of the receiving frame 11 (FIG. 7) in order to prevent a gap from being formed between the structures and is fixed to the receiving frame 11 by an appropriate means. . In this state, the outer space 31 of the form 28 is filled with the general pavement material 26 to construct the general road surface 27. afterwards,
A donut in which the mold 28 is disassembled and removed (FIG. 8), the inner peripheral wall of the general road surface 27 constructed in the previous step is used as the outer mold, and the outside of the receiving frame 11 that is a structure is the inner mold. -Shaped space 33 is formed (FIG. 9), and this space 33 is filled with the special paving material 23 to construct the peeling prevention portion 24 (FIG. 1).
0).

In the first embodiment in which the inside of the mold 18 is filled with the special paving material 23 in the above-mentioned two embodiments, after finishing the surface of the special paving material 23, waiting for curing, after curing, the mold 18
Since the general pavement material 26 is filled and the general pavement material 26 is compacted and compacted, the surface compaction cannot be performed on the surface of the special pavement material. However, in Example 2 in which the general paving material is filled on the outside of the form 28, the general paving material is compacted, then the form 28 is removed, and the inside of the special paving material 23 is filled to finish the surface. The pressure can be applied, and the special paving material 23 may be a thermosetting type or a room temperature curing type.

[0024]

Since the present invention is constructed and operates as described above, a method may be employed in which the formwork is installed outside the structure and then the inside of the formwork is filled with a special paving material. Alternatively, the general pavement material may be filled on the outside of the formwork, and then the special pavement material may be filled between the road surface and the structure using the general pavement material, resulting in a high degree of freedom in construction. The construction work can be carried out efficiently according to the situation, and the boundary between the special pavement material and the general pavement material can be smoothly finished by the formwork, so that the pavement with high durability can be realized. In addition, if the special paving material is formed with two or more layers, the amount of use can be reduced as much as possible even when the material used is expensive. Compared to the case where paving material is laid all around the receiving frame and the compaction is performed, the receiving frame is accidentally hit and the receiving frame and height adjusting mortar are not damaged.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view showing a stage in which a formwork is installed according to a first embodiment of a method for preventing pavement separation around a structure such as a manhole cover receiving frame according to the present invention.

FIG. 2 is a cross-sectional view showing a stage in which a special paving material is filled.

3 is a plan view at the stage of FIG. 2. FIG.

FIG. 4 is a cross-sectional view showing a stage in which a special paving material is filled in a modified example of the first embodiment.

FIG. 5 is a cross-sectional view showing a state where the mold is removed from the stage of FIG.

FIG. 6 is a cross-sectional view showing a step of filling a general pavement material after the step of FIG.

FIG. 7 is a sectional view showing a stage in which a mold is installed in the second embodiment of the present invention.

FIG. 8 is a cross-sectional view showing a state in which the mold is removed according to the second embodiment.

FIG. 9 is a sectional view showing a state in which the mold is also removed.

FIG. 10 is a cross-sectional view showing a stage where the special paving material is filled after the stage shown in FIG. 9;

FIG. 11A is a plan view showing an example of a mold used in the first embodiment. (B) The top view which shows the example of the formwork used for Example 2.

[Explanation of symbols] 11 Receiving frame that is a structure 18, 28 formwork 19, 33 space 23, 25 Special paving materials 24 Peeling prevention section 27 General road surface

Claims (3)

[Claims] 1. A method for preventing peeling of pavement around a structure existing on a road surface such as a manhole cover receiving frame, which is surrounded by a space outside the structure while maintaining a required space between the structure and the structure. A first step of installing a formwork, and filling a special pavement material using fine aggregate in a surface layer appearing on at least a road in a space between the structure and the formwork to construct a separation preventing portion,
Then, a second step of filling a general pavement material around the peeling prevention portion to construct a general road surface, and a method for preventing pavement peeling around a structure such as a manhole cover receiving frame. 2. A method for preventing peeling of pavement around a structure existing on a road surface, such as a manhole cover receiving frame, which is surrounded by a space outside the structure while maintaining a required space between the structure and the structure. A first step of installing a formwork and filling a general pavement material on the outside of the formwork to construct a general road surface, and then a surface layer appearing at least on the road in a space between the constructed general road surface and the structure And a second step of filling a special pavement material using fine aggregates to construct a peeling prevention portion, and a method for preventing pavement peeling around a structure such as a manhole cover receiving frame. 3. The portion constructed by the first step comprises:
The method for preventing pavement peeling around a structure such as a manhole cover receiving frame according to claim 1 or 2, which fulfills the function of a formwork that divides a filling region when performing the second step.