JPS6328285Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a concrete protective fence.

Generally, around important facilities such as nuclear power plants and airports, protective fences using block-folding structures, barbed wire, etc. are installed as a measure to prevent illegal entry by outsiders or accidents. It is being

By the way, such protective walls and fences are easy to construct on-site, require no effort or expense to maintain, and are convenient for early detection of illegal trespassers. However, from its original purpose, it is of course important that the structure is difficult to be easily penetrated or destroyed for the purpose of penetration. This is a particularly important factor in large-scale and important facilities that have a large social impact, such as the aforementioned nuclear power plants and airports.

In this respect, there are problems that need to be solved in conventional protective walls and fences. In other words, for example, the above-mentioned protective wall with a block folding structure has the advantage of being relatively difficult to destroy, but most of the construction work is done on-site, so it takes more time to construct it, and it is also difficult to construct it from the inside of the protective wall to the outside. The disadvantage is that it is difficult to see the situation, and protective fences using barbed wire etc.
Although it is easy to construct, it has the disadvantage of being easily destroyed.

The present invention was developed in consideration of the various problems mentioned above, and in particular, it has a structure that is extremely difficult to enter or destroy, and is extremely easy to construct on-site. It also aims to provide a concrete protective fence with a convenient structure for early detection of illegal trespassers.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 shows a concrete protective fence according to the present invention, and this protective fence, designated as a whole by the symbol A, consists of a large number of concrete pillars 1 of the same structure placed at intervals on the ground G to be constructed. It is constructed by erecting concrete columns 1 and connecting them to each other.

As shown in FIG. 2, the concrete column 1 includes a main column 2 as a vertical member having a so-called shingaeshi 2a whose upper end is bent toward the outside of the protective fence A, and this main column 2. It mainly consists of an auxiliary support 3 as a diagonal member whose upper part is integrated with the main support 2, and a connecting bottom 4 as a horizontal member that integrally connects the lower ends of the auxiliary support 3 and the main support 2. has been
In the illustrated example, the frame has a substantially right-angled triangular frame shape with a high height when viewed from the side.

Then, the connection bottom 4 as the horizontal member is grounded on the ground G, and the auxiliary support 3 is located on the inside of the protective fence (on the side of the facility to be protected), with a distance α between them. are connected to each other. This interval α is set to a level that a person cannot pass through, for example, about 100 to 200 mm. In the embodiment, as shown in FIG. Prismatic protrusions 5, 6, and 7, each serving as a so-called spacer, are formed to protrude from the intersecting corner portions.

In addition, as a method of connecting each concrete column 1 to each other, for the three corners of concrete column 1,
Through-holes 8 that pass through the concrete columns 1 in the connection direction are formed in advance, and using these through-holes 8, several concrete columns 1 are bundled together using long connecting bolts 9. After inserting
A method is adopted in which both ends are fastened with nuts 10 and the ends of adjacent bolts 9 are connected to each other via, for example, a coupler 11 (see FIG. 4). In addition, since the protective fence A is generally quite large, the actual construction work must be done within a range that does not interfere with transportation or work using the crane 12, etc., as shown in Figure 5, for example. A method is adopted in which a plurality of concrete columns 1 are connected to form one block A', which are sequentially erected at the site as shown in the figure, and the blocks A' are connected together via the coupler 11, etc. described above. is preferable.

6 and 7 show the concrete column 1
FIG. 2 is a front view and a sectional view showing the internal structure of the main support 2 in FIG. The main support 2 is formed of concrete 21 to have a rectangular cross section, and four reinforcing bars 22 extending in the axial direction of the main support 2 are buried near the four corners of the cross section. A large number of hoop reinforcements 23 surrounding these reinforcing bars 22 are fixed at intervals in the axial direction of the main column 2. Also, among the four outer surfaces of the main support 2, the surface that becomes the outside of the protective fence A, that is, the front of the main support 2 when the protective fence A is viewed from the front, and the side surfaces 24a and 24b that follow this front. The section is formed of a thin steel 25 having a U-shaped cross section and integrated with concrete 21. That is, the front surface of the main strut 2 is covered with a web portion of channel steel 25 having a U-shaped cross section, and both side surfaces 2 continuing from the front surface of the main strut 2 are
A part of 4a, 24b is the channel steel flange 25
The portions a and 25b are respectively covered. A pair of opposing flanges 2 of this channel steel 25
Two of the four reinforcing bars 22 between 5a and 25b
The structure is such that the book is located, and this channel steel 25
The curved portions forming the peaks and valleys of the wave-shaped lattice stripes 26 extending along the longitudinal direction of the channel steel 25 are welded near the ends of the mutually opposing inner surfaces of both flange plates 25a and 25b. It is said to be a closed structure.

In the protective fence according to the present invention having such a structure, the interval α between each concrete pillar 1 is set to such an extent that a person cannot pass through, and in addition to each main pillar 2 being located on the outside, there are additionally auxiliary pillars 3. Since it has a so-called two-tiered structure with the main pillars located on the inside, even if someone attempting to enter breaks one of the outer main pillars 2 with a hammer, etc. It would be extremely difficult to destroy even pillar 3 and enter the interior.
In other words, even if about one main column 2 is destroyed, the distance between the main columns 2 is still sufficiently small, and because of this, it is difficult to swing a hammer or the like to destroy the next auxiliary column 3 due to the space involved. This is because it will eventually become necessary to break several of the main columns 2.

In addition, especially in the present invention, the main support 2 is the sixth
Since it has the structure as shown in FIG. 7 and FIG. 7, the main support 2 has sufficient strength to be difficult to break and has durability against impact (blow, etc.).

That is, for example, for a concrete column with a general cross-sectional structure as shown in Figure 8a, arrow P
If you hit it with a hammer, etc. from the direction (front),
It has been experimentally confirmed that concrete is destroyed in the manner shown in b→c→d in the figure.

However, in the case of the main support 2 according to the present invention,
Predicted as the part where impact such as a blow will be applied (7th
Since the front surface of the main column 2 (from the direction of arrow P in the figure) and a portion of both side surfaces following this front surface are covered by the channel steel 25, even if it is hit with a hammer etc., the concrete will not be damaged. The impact transmitted to 21 is absorbed and alleviated by channel steel 25. Moreover, since the cross-sectional structure has two reinforcing bars 22 located within the channel steel 25 and lattice bars 26 are welded to both flanges 25a and 25b, the front part of the concrete 21, that is, the channel steel The concrete 21 inside the concrete 25 is unlikely to suffer from corner cracking or cracking due to impact, and even if it were to occur, both flange plates 25a and 25b would be damaged by the concrete 21.
Since the side surfaces of the groove steel 25 are also covered, the concrete pieces and the like that have been left behind are kept intact within the channel steel 25, effectively exhibiting durability against impact.

In the embodiment, four reinforcing bars 22 extending in the axial direction of the main support 2 are installed near the four corners of the cross section of the main support 2.
are buried, and both flanges 25a of the channel steel 25,
Although an example is shown in which the lattice reinforcement 26 is welded between the main struts 25b and 25b, various modifications can be made to the reinforcement structure inside the main strut 2. For example, as shown in FIGS. 9 and 10, , one of the three reinforcing bars 22 is attached to the flange 25 of the channel steel 25.
between a and 25b, the remaining two are buried in the two corners of the surface (rear surface) facing the main body plate 25c of the channel steel 25, and the inner surface of the main body plate 25c of the channel steel 25 and the two corners Two reinforcing bars 22 located respectively in
It is also possible to adopt a reinforcement structure in which lattice reinforcements 26', 26' are passed between 22 and fixed by welding. 2
3 indicates a hoop muscle.

As detailed above, the protective fence according to the present invention is
A large number of concrete columns of the same structure, each having a main column located on the outside and an auxiliary column located on the inside, are erected at intervals from each other, and these concrete columns are connected to each other. Since the front surface and a portion of both sides are covered with channel steel with lattice strips or the like provided on the groove side, the structure is extremely difficult to destroy, especially for the purpose of entering.

In addition, appropriate intervals (gaps) are formed between each concrete pillar, which is convenient for early detection of intruders.Furthermore, from the perspective of construction work, it is convenient to install one concrete pillar 1 at the site. Since they can be constructed by erecting them one by one or in blocks and then connecting them, they have various excellent effects, such as extremely simple and efficient work on site.

[Brief explanation of the drawing]

Figures 1 to 8 show an embodiment of the present invention, with Figure 1 being a perspective view, Figures 2 and 3 being a right side view and perspective view of a concrete column, and Figure 4 being a concrete column. Figure 5 is an explanatory diagram showing the work procedure; Figures 6 and 7 are a partially omitted front view and cross-sectional view of the main support; Figures 8a and b , c, and d are explanatory diagrams of the operation, and FIGS. 9 and 10 are a partially omitted right side view and cross-sectional view showing other embodiments of the present invention. 1...Concrete pillar, 2...Main pillar, 3...
Auxiliary support column, 4...Connection bottom, 5, 6, 7...Protrusion, 8...Through hole, 9...Connection bolt, 10...
Nut, 11...Coupler, 21...Concrete, 22...Reinforcement, 23...Hoop reinforcement, 24a,
24b... Side surface, 25... Channel steel, 25a, 25
b...Flange, 26, 26'...Lattice muscle, A
...protective fence, G...ground.

Claims (1)

[Scope of utility model registration request] A large number of concrete pillars of the same structure are erected at intervals from each other, each having a main pillar to be located outside the facility to be protected and an auxiliary pillar to be located inside the main pillar. In a concrete protection fence constructed by connecting these concrete pillars to each other, the main support of the concrete pillar is formed in a rectangular cross-section, and the front surface, which is the outside of the protection fence, of the four outer surfaces of the main support is formed. What is claimed is: 1. A concrete protective fence, characterized in that the fence is covered with a web portion of channel steel having a U-shaped cross section, and a portion of both side surfaces of the main column following the front surface are covered with flange portions of the channel steel.