JPH08311832A - Modifying method for protective fence structure of road - Google Patents

Abstract

PURPOSE: To shorten the construction period by removing an existing protective fence structure except for a ground cover raising part, erecting stanchions on the stanchion holes of the raising part, and placing concrete between wall bodies provided on both sides of the raising part. CONSTITUTION: After a fence body and curbstones are removed, a raising part 1 is stretched to match the shapes of the wall bodies 6 to be provided on both sides, and buried reinforcing bars are slightly exposed. Stanchion holes 8 are bored at proper intervals on the raising section 1 to the bottom face of the raising part 1. Steel stanchions 9 are erected on the stanchion holes 8 to the position of the required resistance bending moment, and a filler is filled to fix them. The steel wall bodies 6 are fitted on both sides of the raising part 1 by bolts 12 with bolt holes bored at the installation sections 10 of a floor board 5, and they are connected by connecting plates 15. Concrete is placed between the wall bodies 6 arranged face to face.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing a protective fence structure such as a median strip such as a road and a roadside zone.

[0002]

2. Description of the Related Art In a conventional method of repairing a protective fence structure such as a median strip such as a road or a roadside belt, the existing protective fence structure is dismantled and removed. After that, a form is assembled on both sides, concrete is poured into the form, and when the concrete reaches a required strength, the form is removed to restore the protective fence structure.

[0003] Such a method has several problems. The major problem is that the construction period is long, so that the traffic of the vehicle must be restricted for a long period of time, and the rebar cover thickness must be accurately adjusted during the construction. Is difficult, and if the vehicle accidentally collides with the guard fence structure after restoration, the guard fence structure is easily damaged.

As a proposal to solve these problems, when constructing a median strip such as a road, a reinforcing bar is assembled on the floor slab, and a pair of molds on both sides of the reinforcing bar also serving as a formwork. The fiber reinforced concrete slabs are fixed to the floor slabs with their base ends fixed to the floor slabs via fixing brackets, and then concrete is poured between the fiber reinforced concrete slabs to form the concrete slabs. A method of constructing a median strip in which fiber reinforced concrete slabs on both sides are integrated has been proposed (Japanese Patent Publication No. 4-6968).
4).

This construction method is excellent in forming a new protective fence structure, but is not necessarily satisfactory for the repair of an existing protective fence structure. That is,
The necessity of fine rebar arrangement lengthens the construction period, and it is difficult to maintain sufficient strength due to difficulty in fixing to existing structures.

[0006] Guard fence structures usually have both a meaning of defining a lane and a meaning of preventing the vehicle from leaving the lane. In the latter meaning, the higher the height of the protective fence structure, the higher its function, and the more rigid the fence, the more it can be prevented from breaking into the oncoming lane. However, when the vehicle collides with the protective fence structure, the driver is subjected to a considerable impact and is at risk for life. In order to protect the driver who has caused the accident, the speed of the vehicle,
Due to the weight of the vehicle, the structure is easily damaged to some extent. For this reason, when the vehicle collides violently with the median strip, for example, the vehicle may break down and break through the median strip, jump out into the oncoming lane, and cause an oncoming vehicle to be involved. The idea of protecting the driver who has caused an accident is, of course, important, but it is not desirable for a third party to be involved.

Therefore, in recent years, concrete fence structures made of concrete have emerged in Europe and the United States from the viewpoint that vehicles must not be broken through the fence structures such as a median strip (Concret issued by the Japan Cement Association).
e EngineeringNews September 1992 issue European and American concrete protective fences).

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has been made in view of the problem that, for the rehabilitation of a protective fence structure, there is a limitation on vehicle traffic for a long period of time, and the rebar cover thickness cannot be accurately adjusted. An object of the present invention is to solve a structural problem of uncertainty of construction and being easily damaged, and to propose a method of repairing a protection fence structure so that a vehicle does not break through the protection fence structure.

[0009]

[Means for Solving the Problems] In order to solve the above problems and to repair a vehicle to prevent the vehicle from breaking through the protective fence structure, the repair method is to raise the existing protective fence structure to the ground. Part of the ground cover is lifted up and steel pillars are built in the pillar holes formed at appropriate intervals in the ground cover raising section to strengthen the fixing and also to be used as a formwork on both sides of the ground cover raising section. This is done by placing the wall body on the floor slab and placing concrete between the steel wall bodies that also serve as the formwork.

[0010] In the above means, it is preferable that the raised portion of the ground covering is removed so as to protrude the buried reinforcing bar, and a steel wall body also serving as an opposite formwork. It is preferable to attach a reinforcing plate to the inner surface of the base.

[0011]

[Function] The steel strut built and anchored in the existing ground covering erecting section and the newly cast concrete on the existing ground covering elevating section are integrated as a whole, and the strut serves as a reinforcing bar. Therefore, the work of arranging the rebar can be omitted,
Further, by not disposing the reinforcing bar, it is possible to eliminate a narrow portion of the covering of the reinforcing bar between the wall body which also functions as a steel form frame and which is opposed to each other, and it becomes easy to sufficiently fill the concrete.

Since the surface of the cast concrete is covered with a wall which also serves as a steel formwork, there is no need to worry about cracking or peeling of the concrete, and at the same time, the protective fence structure itself has a vehicle or the like. In the event of a collision, the protective fence structure has strong resistance to impact due to the rigid struts and walls made of steel, and does not allow the vehicle to deviate to the oncoming lane or the like.

[0013] In the fixing step, only the wall that also serves as a formwork is attached to the floor slab, and the work is extremely small, and it is not necessary to remove the mold. Therefore, the strength of the poured concrete reaches a predetermined strength. If this is the case, traffic can be opened.

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing an example of a median strip, which is a protective fence structure to be repaired, as viewed in the bridge axis direction. In this median strip, a ground covering portion including a raised portion 1 and curbs 2.2 located on both sides of the raised portion 1 is formed on the upper surface of the floor slab 5, and a fence body 4 is installed above the raised portion 1. Has become.

In the present embodiment, in such a protective fence structure, first, as shown in FIG.
By removing 2 to fit the shape of the wall body in which the raised portion 1 is provided on both sides of the raised portion 1, the buried reinforcing bar 7 is slightly exposed, and the raised portion 1 is exposed in the bridge axis direction. Post holes 8 are drilled at appropriate intervals to the bottom surface of the raised portion 1, steel posts 9 are built up to the position of the required resistance bending moment, and a filler is filled and fixed. Depending on the shape of the opposed wall, the lifting of the raised portion 1 may or may not be performed. Although the support 9 is made of H steel, its shape is not limited as long as it has a required section modulus.

Then, as shown in FIG. 3, steel walls 6.6 are attached to the floor slab 5 on both sides of the raised portion 1 by bolts 12 using bolt holes 11 formed in the installation portion 10. The opposed wall bodies 6, 6 have an appropriate length in the bridge axis direction as shown in FIGS. 4 and 5, and have vertical ribs 13 and horizontal ribs 14 fixed on the inner surfaces thereof. Vertical ribs 13 and horizontal ribs 14
Is attached to reinforce the wall bodies 6 and 6 and may be attached if necessary. Reference numeral 15 denotes a connecting plate for the opposed wall bodies 6.

The opposing wall bodies 6 and 6 also serve as a mold, and the wall body 6
・ Concrete is poured between 6 The cast concrete is integrated with the raising portion 1 because the pillars 9 built in the raising portion 1 substitute for the reinforcing bars. Vertical rib 13
And the horizontal rib 14 also bites into the concrete. The wall that also serves as the mold does not have to be demolded.

FIG. 6 is a sectional view showing another embodiment. This embodiment is different from the previous embodiment in that the support holes 8 formed in the raised portion 1 and the supports 9 built in the support holes 8 are two rows.

[0019]

As described above, the present invention has the following effects. In Claim 1, the existing ground cover raising part is left, and the steel pillar is built in the raising part, and the supporting part of the raising part and the wall body is fixed and the role of the reinforcing bar is provided. The detailed work of dismantling and dismantling and arranging the reinforcing bars can be omitted, and the fixing work can be shortened because it is a small work of attaching the wall that also serves as the formwork to the floor slab. Moreover, it is not necessary to demold the wall that also serves as the formwork, so that the traffic can be opened if the strength of the cast concrete reaches a predetermined level.

Since the configuration is such that no rebar is arranged,
It is possible to eliminate the narrow part of the cover of the reinforcing bar between the wall that also serves as the formwork, and it is possible to sufficiently fill the concrete.

Since the surface of the cast concrete is covered with a wall that also serves as a steel mold, there is no fear of cracking or peeling of the concrete. Even if it collides, the protective fence structure is a steel wall that also serves as a rigid support and a formwork, so it exerts strong resistance to impact and does not let the vehicle break through in the opposite lane. .

In the second aspect of the present invention, since the ground cover elevating part is pulled to the extent that the embedded reinforcing bar projects, the reinforcing bar ensures the integrity of the elevating part and the newly cast concrete. It will be stronger.

According to the third aspect of the present invention, since the reinforcing plate is attached to the inner surface of the wall that also serves as the formwork, the steel flat surface can be accurately held when the concrete is poured, and the reinforcing plate is newly added. By biting into the installed concrete, the integrity between the wall body and the newly placed concrete becomes stronger, and the impact such as a collision of a vehicle can be strongly resisted.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a median strip which is a protective fence structure to be renovated.

FIG. 2 is a cross-sectional view illustrating a state in which a ground cover raising portion is left and other portions are removed, and columns are built in the raising portion in FIG. 1.

FIG. 3 is a cross-sectional view showing an example of a main part of the present invention, and FIG.
-A line sectional view.

FIG. 4 is a side view in which the walls of the mold are located on both sides of the ground cover raising portion in FIG.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

FIG. 6 is a sectional view showing another embodiment.

[Explanation of symbols]

 1 Raised part 2 Curb 3 Pave 4 Fence 5 Floor slab 6 Wall 7 Reinforcing bar 8 Support hole 9 Support 10 Installation part 11 Bolt hole 12 Bolt 13 Vertical rib 14 Horizontal rib 15 Connecting plate

Claims (3)

[Claims] 1. An existing protection fence structure is removed leaving a ground covering raising portion, steel pillars are built in pillar holes formed at appropriate intervals in the ground covering raising portion, and ground covering is raised. A protective fence structure for roads, etc. characterized in that steel walls that also serve as formwork are placed on the floor slabs on both sides of the part, and concrete is placed between the steel walls that also serve as formwork. How to repair things. 2. The method for repairing a protective fence structure such as a road according to claim 1, wherein the ground reinforcement is raised to such an extent that an embedded reinforcing bar protrudes. 3. A reinforcing plate is attached to an inner surface of a steel wall that also serves as a facing formwork.
The method for repairing protective fence structures such as roads described in.