JP2002356837A - Safety cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safety cover superior to a conventional one, in which the number of parts is decreased, the labor of assembly is simplified and the term of works is shortened and a cost can be reduced by using only a main frame as a member capable of preventing the fall of a person and the entering of refuse to a recessed ditch (such as a water way) and which has an auxiliary frame for the strength. SOLUTION: Reinforcing materials 12 are fitted at the end sections of the pipe main frames 10 curved in a circular arc and double structures are formed, and the front end sections of the double structures are flattened and holes for inserting bolts are bored to the front end sections and a frame body member 11 is constituted. The end sections of the frame body members 11 are bolted to a metallic base 14 fixed at the upper end section of the side wall 9a of the recessed ditch 9 and a plurality of the frame body members 11 are built at proper intervals, pipe joining frames 17 towards the longitudinal direction of the recessed ditch 9 are stretched over these frame body members 11, the crossing main frames 10 and the joining frames 17 are connected by wire-shaped elastic members, and a metallic cover net 19 is laid on these main frames 10 and joining frames 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety cover for preventing debris from entering a ditch in a waterway, a sidewalk or the like and preventing a person from falling down.

[0002]

2. Description of the Related Art Covers for agricultural waterways and the like are described in Utility Model Registration No. 1584567 (Japanese Utility Model Publication No. 59-23794), Japanese Utility Model Publication No. 4-34197, Japanese Utility Model Publication No. 4-34198, and the like.

As shown in FIG. 13, an auxiliary frame 2 also formed of a pipe is arranged inside a main frame 1 formed in a roof shape by a pipe, thereby forming a frame 3. In this case, the auxiliary frame 2 is partially connected to the main frame 1 in the middle, and has a brace-like existence.

[0004] Such frame members 3 are erected at appropriate intervals via an angle-shaped metal base plate 5 provided in a bank 41 of a waterway 4, and the frame members 3 arranged in parallel are connected to the main frame 1. Are connected in the longitudinal direction of the water channel 4 by connecting them with a joint frame 6 also as a cross member made of a pipe. Then, a cover net 7 made of a steel net was laid on the entire upper surface.

[0005] The cover of FIG. 13 thus constructed is
The frame 3 whose strength has been increased by the auxiliary frame 2 can be easily extended simply by increasing the required number thereof, and the overall strength is high because the frame 3 mainly bears the force. Can safely deal with it.

[0006]

However, in the cover shown in FIG. 13, the frame 3 is composed of two pipes, the main frame 1 and the auxiliary frame 2, so that the number of members is large and these frames are connected to each other. It is necessary to connect the main frame 1 and the auxiliary frame 2 together so as to surround the main frame 1 and the auxiliary frame 2 together in the Utility Model Registration No. 1584567 (Japanese Utility Model Publication No. 59-23794).
It is fixed by. The end of the tightening band 8 is a bolt,
Stop with nut 22.

In Japanese Utility Model Publication No. 4-34197, a short sheath tube having an appropriate length is attached to one frame by welding, and the other frame is inserted through the sheath tube. As described above, the frame 3 is composed of the main frame 1 and the auxiliary frame 2.
If it is made of a book pipe, assembly is troublesome.

[0008] The object of the present invention is to eliminate the disadvantages of the prior art and to use only the main frame, thereby reducing the number of members, simplifying the assembling labor, shortening the construction period and reducing the cost, and improving the strength. Another object of the present invention is to provide a safety cover having an auxiliary frame that is comparable to conventional products.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention firstly provides a double structure by fitting a reinforcing material to an end of a pipe main frame which is curved into an arc, and flattening the end of the structure. A hole for bolt insertion is formed here to form a frame member, and an end of the frame member is bolted to a metal base fixed to an upper end portion of the concave groove side wall to form a plurality of frame members. The members are erected at appropriate intervals, a pipe joint frame extending in the length direction of the concave groove is bridged over these frame members, and the intersecting main frame and the joint frame are joined by a wire-like elastic member, and a metal cover net is attached to these. The main point is that the cable has been laid.

Secondly, the wire-like elastic member has a vertically inverted U-shaped portion looped around one pipe, and a U-shaped curved portion looped around the other pipe as a bent portion of an end of the U-shaped portion. And an openable inverted U-shaped portion that is formed by bending the ends of the parallel extending straight portions to butt and hang around one of the pipes.
In addition, the joint frame is to be installed on the frame member.
In addition, a metal base is installed at appropriate intervals, and a net fixing member made of a round bar is arranged at the outer end of the metal cover net so as to alternately sew the mesh, and this net fixing is performed. The gist of the invention is that the member is laid across a plurality of bases and bolted to the bases with J or U bolts.

According to the first aspect of the present invention, since the frame is only one pipe main frame and does not require an auxiliary frame, the number of members is small, and labor for connecting the main frame and the auxiliary frame is reduced. Not required. The main frame is curved in a circular arc as a whole, and is stable as a so-called arch type. In addition, if the end is flattened and drilled for mounting, this part may become a fragile part. There is no such a possibility by fitting the material into a double structure, and the strength is more reliable.

Further, the intersecting main frame and joint frame can be easily connected by a wire-like elastic member.

According to the second aspect of the present invention, in addition to the above-described operation, the main frame and the joint frame can be quickly connected by using the shape of the wire-like elastic member as it is.

According to the third aspect of the present invention, since the splicing frame is erected with the spliced frame facing upward, the wire-like elastic member can be hung without the need for temporary holding. Can support a person or the like, and can be used as a strength member.

According to the fourth aspect of the present invention, the outer end of the metal cover net is easily bolted to the base while applying a tensile force with a J or U bolt to the round bar. As compared with the case where a flat plate is used as a net fixing member and bolted to a base, fine adjustment of the position can be easily performed without providing a long hole or the like.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view showing an embodiment of the safety cover of the present invention, FIG. 2 is an upper side view thereof, FIG. 3 is a partially omitted front view, and 9 in the figure is an agricultural waterway, a walking path,
Other grooves are provided, and 9a is a side wall of the groove 9.

Although the safety cover of the present invention is installed to prevent a person from falling into the concave groove 9 and dust from entering, the frame member 11 is formed only by the pipe main frame 10 curved into an arc. And the conventional auxiliary frame is omitted.

The end of the pipe main frame 10 is a straight portion as an extension of an arc, and a reinforcing member 12 is fitted to this end as shown in FIG. 4 to form a double structure. The reinforcing member 12 is a pipe fitted to the end of the pipe main frame 10 from the outside. As an example, if the main frame 10 is φ19.1,
As shown in FIGS. 5 and 6, the tip is crushed together and flattened, leaving about 100 to 150 m / m (α portion) as shown in FIGS. 13 were drilled. The hole 13 may be formed by crushing both the main frame 10 and the reinforcing member 12 and then penetrating the same together.

In FIG. 4, reference numeral 14 denotes a metal base having an L-shaped cross section. The base 4 has a length of 50 cm.
As shown in FIG. 9, an anchor bolt 15 as a fixing member and a nut are fixed to the upper end of the side wall 9a of the concave groove 9 at intervals of 50 cm.

A rectangular metal mounting plate 14a is provided on both end surfaces of the base 14 by welding, so that the whole is a horizontally long box having an upper surface and an open front surface. This mounting plate 14
A hole 13 'for bolt insertion is also formed in a.

In this manner, the end portions of the frame member 11 are bolted to the mounting plate 14a of the base 14 with the mounting bolts 16, and the plurality of frame members 11 are erected on the concave grooves 9 at appropriate intervals. A pipe joint frame 17 extending in the length direction of the concave groove 9 was placed over these frame members 11 so as to be placed thereon.

In the present embodiment, three splicing frames 17 are arranged in parallel along the arc of the main frame 10 at intervals.
The intersecting main frame 10 and joining frame 17 are joined by a wire-like elastic member 18.

FIGS. 10 and 11 show the details of the wire-like elastic member 18. As shown in FIG. U-shaped curved portion 18b hung around the other pipe
And an extended U-shaped portion 18d which is formed by curving the ends of the parallel extending linear portions 18c and abutting them on one of the pipes to wrap around one of the pipes.
And

The entirety is opened from the openable inverted U-shaped portion 18d, the vertical inverted U-shaped portion 18a is wrapped around the joint frame 17 located on the main frame 10, and the U-shaped curved portion 18b is directly connected to the main frame 10 as it is. To extend the extended straight portion 18c obliquely upward, and finally hook the openable inverted U-shaped portion 18d on the joint frame 17 and hang it.

After the joining frame 17 is fixed to the main frame 10 in this way, a metal cover net 19 is laid on these, and as shown in FIG. A net fixing member by the round bar 20 is provided so as to penetrate the mesh so as to alternately sew the mesh.

As described above, the metal bases 14 are provided at appropriate intervals, and the round bar 20 is laid across the plurality of bases 14 and the bases 14 are Bolt to the vertical piece.

The results of a study using the thus constructed safety cover of the present invention are shown below.

The design conditions are as follows. (See Figure 12
Opening width SH: O.900m Span length L: 1.010m Pitch between frames P: 0.500m Frame height f: O.291m Snow depth H: O.500m Snow unit weight γ: 350kg / m³  Material used Pipe: 19.1 × 1.2φ t (mm) Cross section of material used Outer diameter d: 19.1φ Inner diameter d₁： 16.7φ Thickness t ： 1.2mm

Load applied to the frame w = γ · HP = 350 × 0.500 × 0.500 = 87.5 kg / m

[0030] ◇ sectional ^{area; Fs (cm 2) Fs =} π (d 2 -d 1 2) / 4 = 0.785 (d 2 -d 1 2) = 0.785 × (1.91 2 -1.67 2) = 0.674 (cm 2 ) ◇ the second ^{moment; Is (cm 4) Is =} π (d 4 -d 1 4) / 64 = 0.0491 (d 4 -d 1 4) = 0.0491 × (1.91 4 -1.67 4) = 0.272 (cm 4 ) ◇ section ^{modulus; G (cm 3) G =} π (d 4 -d 1 4) / 32d = 0.0982 × (d 4 -d 1 4) / d4 = 0.0982 × 1.91 4 -1.67 4 /1.91 = 0.284 (cm ³ )

The maximum bending moment ^{Ms = wL 2/8 · μ} / (1 + μ) = 0.875 × 101 2 /8×0.000894/(1 tens 0.000894) = 0.997 (kg · cm ) μ = 15/8 · 1 / f 2・ Is / Fs = 15/8 ・ 1 / 29.1 ²・ 0.272 / 0.674 = 0.000894

Bending stress σ = Ms / G = 0.997 / 0.284 = 3.51 (kg / cm ² ) ∴σ <σa = 2400 kg / cm ² (Allowable stress) OK

The fulcrum of the stress horizontal stress ^{H = wl 2 / 8f (1} + μ) = 0.875 × 101 2 /(8×29.1×1.000894) = 38.31 kg ∴H <P L = 320 kg / cm 2 ( anchor shear maximum load) …………OK

The snow load S = γ · L '· H = 350 × L 1 × L 2 × 0.5 = 350 × 1.01 × 1 × 0.5 = 176.75 (kg) L'; horizontal projection area of the roof (L '= L ₁ × L ₂ )

Wind load Calculated as horizontal wind W = Pw · f · 2P = q · Cf · f · 2P = q · (Cpe−Cpi) · f · 2P = 60√f (1.4kz-0) · f・ 2P = 60√0.291 (1.4 × 1) × 0.291 × 2 × 0.5 = 13.186 (kg) Pw; Wind pressure q; Speed pressure Cf; Wind pressure coefficient Cpe; External pressure coefficient Cpi; Internal pressure coefficient Kz; If f ≤ 5m, calculate as kz = 1.0

Seismic force K = (Gp + S) × Q = (Gp + S) × Ci × Gp = (Gp + S) · Z · Rt · Ai · Co · Gp = (11.23 + 176.75) × 0.9 × 1 × Ai × 0.2 × 11.23 = 379.98 × Ai = 379.98 (kg) Gp; Own weight (11.23kg) Ci: Seismic layer shear force coefficient Z; Regional coefficient Rt; Vibration specific coefficient Ai; Height distribution coefficient Calculated Co; Standard shear coefficient

Calculation of allowable stress 1) Long-term stress (constant) σc = Gp + S = 11.23 + 176.75 = 187.9 (kg) ∴σc <1600 kg / cm ² (long-term allowable stress) …… OK Short-term stress (snow ) Ts = Gp + S = 11.23 + 176.75 = 187.98 (kg) ∴ σc <2400 kg / cm ² (short-term allowable stress) ... OK (during storms) σtw = Gp + 3.5S + W = 11.23 + 3.5 × 176.75 ＋13.186 = 643.04 (kg) ∴σtw <2400 kg / cm ² (short-term allowable power) …… 0K (at the time of earthquake) σtk = Gp + 0.35S + K = 11.23 + 0.35 × 176.75 + 379.98 = 453.07 (kg) ∴σtk <2400 kg / cm ² (short term allowable stress) …… 0K

From the above calculation results, the assumed member (pipe 19.1)
There is no problem even if (φ × 1.2t) is used as a main member of the main frame 10.

[0039]

As described above, the safety cover of the present invention can prevent a person from falling into a concave groove (a water channel or the like) or entering dust, so that only the main frame is required.
The number of members can be reduced, the labor for assembling can be simplified, the construction period can be shortened, and the cost can be reduced. In addition, the strength is comparable to that of a conventional product having an auxiliary frame.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of a safety cover of the present invention.

FIG. 2 is a side view showing an embodiment of the safety cover of the present invention.

FIG. 3 is a partially omitted front view showing an embodiment of the safety cover of the present invention.

FIG. 4 is a perspective view of a base portion showing one embodiment of the safety cover of the present invention.

FIG. 5 is an explanatory view showing a production process of an end of a main frame.

FIG. 6 is a vertical sectional side view of an end of a main frame.

FIG. 7 is an explanatory view showing one embodiment of the safety cover of the present invention.

FIG. 8 is a front view of a base portion showing one embodiment of the safety cover of the present invention.

FIG. 9 is a perspective view of a base installed state showing one embodiment of the safety cover of the present invention.

FIG. 10 is a perspective view of a stage before stopping showing the use of a wire-like elastic member in the connection between the main frame and the joining frame.

FIG. 11 is a perspective view of a post-stop stage showing the use of a wire-like elastic member in the connection between the main frame and the joining frame.

FIG. 12 is an explanatory diagram for calculating design conditions.

FIG. 13 is a front view showing a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Main frame 2 ... Auxiliary frame 3 ... Frame 4 ... Water channel 5 ... Base plate 6 ... Joint frame 7 ... Cover net 8 ... Tightening band 9 ... Bolt / Nut 9 ... Depressed groove 9a ... Side wall 10 ... Main frame 11 ... Frame Member 12 ... Reinforcing material 13,1
3 '... hole 14 ... base 14a ... mounting plate 15 ... anchor bolt 16 ... mounting bolt 17 ... joint frame 18 ... wire-like elastic member 18a ... vertical inverted U-shaped portion 18b ... U
Mold curved portion 18c ... Extended linear portion 18d ... Openable inverted U-shaped portion 19 ... Metal cover net 20 ... Round bar 21 ... J or U bolt 22 ... Bolt / nut 41 ... Dike

Claims (4)

[Claims] 1. A frame member is formed by fitting a reinforcing material to an end of a pipe main frame curved into an arc to form a double structure, flattening a tip portion thereof, and drilling a hole for bolt insertion therethrough. Then, the frame member ends are bolted to a metal base fixed to the upper end of the groove side wall, and a plurality of frame members are erected at appropriate intervals. A safety cover, comprising: a pipe joint frame extending over the main frame; a main frame and a joint frame intersecting each other are connected by a wire-like elastic member, and a metal cover net is laid on the main frame and the joint frame. 2. A wire-shaped elastic member includes a vertically inverted U-shaped portion looped around one pipe, a U-shaped curved portion looped around the other pipe as a bent portion of an end of the U-shaped portion, and a U-shaped bent portion. 2. The safety cover according to claim 1, wherein said safety cover is an openable inverted U-shaped portion which comprises a front extending straight portion, and wherein the ends of said parallel extending straight portions are curved and abutted and hang around one of said pipes. 3. The safety cover according to claim 1, wherein the joint frame is provided on the frame member. 4. A metal base is installed at an appropriate interval, and a net fixing member made of a round bar is provided at an outer end of the metal cover net so as to sew the mesh alternately. 4. The safety cover according to claim 1, wherein the net fixing member extends over a plurality of bases and is bolted to the bases with J or U bolts.