JP2000178919A - Spring-up type steel-made inspection bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spring-up type steel-made inspection bridge taking measures to cope with snowing, at the same time, lightening it as much as possible so as to build it by human power only and constructing it as divided/ built-up structure. SOLUTION: A spring-up type steel-made inspection bridge is equipped with bridge girder units A connecting a plurality of vertical and horizontal girders in the shape of a rectangular frame, walking board units B having size capable of being piled up on them to mount, hinges C connected to the side ends of the bridge girder units A in a state capable of freely rising and falling and a fixing device D for fixing a rising state. Then, the walking board units B stretches net or lattice-like treads to rectangular frames. A plurality of kinds of bridge girder units having different lengths are prepared, and they are properly combined with each other to connect them so as to have a required length.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission tower installed in a remote mountainous area having a large amount of snow in winter, for example. It relates to a climbing steel patrol bridge made to be able to.

[0002]

2. Description of the Related Art In many cases, the existing patrol bridges simply have thinned logs that are close at hand hang over valleys or the like. In some cases, a full-scale steel patrol bridge has also been built.

[0003]

As described above, if the log bridge is used in time, the construction cost can be kept sufficiently low, but the feet are not stable, and it is not easy to walk. This is especially dangerous if the bridge is rocky. Further, corrosion progresses year by year, and the durability is poor. In addition, if the corrosion is not noticed, it may fall down.

[0004] On the other hand, the steel patrol bridge is considerably expensive, but has almost satisfactory durability and has no problem in safety. However, since the steel bridge is quite heavy, a crane is required at the time of installation on site, and erection work in remote mountainous areas requires much labor and expense. And, of course, there are many places where cranes cannot be carried. Furthermore, in areas where the amount of snow is large, a large snow load is applied on the bridge. Therefore, if the bridge is made rugged enough to withstand it, not only will the bridging work become more difficult but also the cost will increase.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a jumping steel structure adopting a divided / assembled structure which can take a countermeasure against snow cover, has a light and simple structure as much as possible, and can be installed only by human power without relying on heavy machinery. To provide a patrol bridge.

[0006]

SUMMARY OF THE INVENTION To achieve the above object, a jumping steel patrol bridge according to the present invention comprises connecting a plurality of longitudinal beams and horizontal beams to a rectangular frame. A bridge girder unit A, a walking plate unit B having a size that can be placed on the upper surface of the bridge girder unit A, and a side end of the walking girder unit B standing and falling on the side end of the bridge girder unit A. And a fixing means D for fixing the upright state. The walking board unit B may have a configuration in which a net or a grid-like tread is stretched over a rectangular frame. Further, as a fixing means D, a hook portion is provided with its base end side connected to the side end of the walking plate unit B with a pin, and the front end portion is hooked to a handrail E erected on the side end of the bridge girder unit A. It is advisable to use metal fittings. The bridge girder unit A with the walking plate unit B assembled
It is preferable that a plurality of types having different lengths are prepared, and they are appropriately combined and connected to form a patrol bridge having a required length. A plurality of walking board units B may be removably assembled in tandem with each bridge girder unit A.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a jumping steel patrol bridge of this embodiment (hereinafter simply referred to as a patrol bridge) in a state where a walking board unit is flipped up in preparation for snowfall. Note that the rightmost walking plate unit is left without jumping up.

In the schematic structure of the patrol bridge shown in the figure, three bridge girder units A having different lengths are connected in tandem to assemble a bridge girder of a desired length. At the side end of each bridge girder unit A,
Each side end of two or three walking board units B is connected via a hinge C so as to be able to stand up and down in accordance with the length. Also, at one side end of each bridge girder unit A,
A handrail E is standing. Further, a fixing means D (FIG. 6) for fixing the standing state of each walking plate unit B is provided.
Reference).

In the bridge girder unit A shown in FIGS. 2 and 3, two vertical girder members 1, 1 of a predetermined length, which are arranged in parallel at a predetermined distance, are spaced at an appropriate distance. A configuration is provided in which a total of five horizontal beam members 2 and 3 are connected in a rectangular frame shape. In this bridge girder unit A, two walking board units B are assembled in tandem. Therefore, on the upper surface of one of the longitudinal beam members 1, a pair of pin insertion fittings 4a constituting one half of the hinge portion C are protruded at a total of four places.

As shown in FIGS. 3 and 4, one of the vertical beam members 1 is provided with upright columns 5 constituting a handrail E at two positions near both ends thereof. A handrail bar 6 made of a pipe is provided between the columns 5 and 5. Railing E
Assembling and mounting is by bolting. Each stringer 1
Are provided with bolt holes 7 for connecting the bridge girder units A to each other.

Next, as shown in FIGS. 5 and 6, the walking board unit B has a structure in which a net-shaped tread board 22 is stretched on the upper surface of the rectangular frame 21. Rectangular frame 21
, A reinforcing bone 21a is appropriately disposed. In this case, the tread plate 22 is formed by providing a large number of cuts in a steel plate and expanding the plate. Then, on one edge in the longitudinal direction of the rectangular frame 21, one set of each of the pin insertion fittings 4b constituting the other half of the hinge portion C is protruded at two places facing the pin insertion fitting 4a. ing.

Further, as shown in FIG. 6, a fastener 30 as fixing means D is mounted on the rectangular frame 21 at the lateral end face in the width direction. The metal clasp 30 has a metal rod 31 having a predetermined length fixed to a base plate and fixed to a rotating plate 32, and having a distal end curved into a semi-arc having a curvature substantially equal to the outer diameter of the handrail bar 6. The section 33 is provided.

A pin 34 serving as a rotating shaft is protrudingly provided on the back side of the rotating plate 32. The pin 34 is loosely fitted in a long hole 35 provided on the side surface of the rectangular frame 21 in a locked state. Let me. Further, a metal rod 3 is provided on the side of the rectangular frame 21.
Hook-shaped clasp 36 for elastically holding near the tip of 1
Is installed.

A plurality of bridge girder units A having different lengths, for example, every 1 m are prepared. on the other hand,
If only one type of the walking board unit B is prepared and placed with a length of 1 m, it can be shared by the bridge girder units A having different lengths.

Next, FIGS. 7 and 8 show an assembling structure when a patrol bridge is assembled using two bridge girder units A. FIG. FIG. 7 is a plan view of the patrol bridge.
Illustration of one half side in the width direction is omitted. FIG. 8 is a side view.

A base plate 42 is bolted to one end of each bridge girder unit A using a bolt hole 7. The two base plates 42 are for placing both ends of the patrol bridge on the erection ground. Although not shown, insertion holes for inserting anchor bolts or anchor rods embedded or driven into the ground are provided at both ends of the base plate 42.

The two bridge girder units A, A
The bridge girder part of the patrol bridge can be easily and quickly assembled by connecting the bolts with the bolt. On both left and right sides of the connecting plate 41, bolt holes are provided at a plurality of locations corresponding to the bolt hole 7 groups provided at both ends of the vertical girder member 1. On the assembled bridge girder,
Attach railing E as described above. Alternatively, it may be attached before the bridge girder units A, A are connected. The butted portions of the two handrail bars 6 and 6 are integrally connected by using a connection fitting 8.

After assembling and erection of the bridge girder portion, the walking plate units B are attached to both bridge girder units A, respectively. For this purpose, the walking plate unit B is placed on the bridge girder unit A, and each pin set
The connecting pins (not shown) may be inserted into the pin holes a and 4b in a state where they are not removed. In the case of the short and light bridge girder unit A, the walking girder unit B may be assembled in advance to the bridge girder unit A, and then the patrol bridge may be assembled.

The bridge girder unit A, the walking board unit B, the handrail E, etc., which are the unit members constituting the patrol bridge, are made to have a weight that can be easily transported by one or two persons. Are connected to each other with bolts. Therefore, the above-described series of bridging operations can be performed easily and quickly by a small number of people without using a heavy machine such as a crane.

In this patrol bridge, each walking board unit B is usually placed sideways on the bridge girder unit A, with the hinge unit C as a rotation axis. However, in an area with a large amount of snow, the weight of the snow falling on the bridge may destroy the patrol bridge. Therefore, only in winter, when the patrol bridge is not used, each walking board unit B is rotated around the hinge portion C and fixed in an upright state as shown by a virtual line in FIG. .

For this purpose, the fastener 30 normally fixed to the side surface of the frame with the use of the clasp 36 is removed from the clasp 36 and rotated 180 degrees toward the handrail bar 6. Then, the stopper 30 may be pulled up by the length of the elongated hole 35 and the hook 33 may be hooked on the handrail bar 6.

In an area where the amount of snowfall is relatively small, even if the walking board unit B is left lying down in winter,
Is made like a net, so there is no danger of snow falling on it.

A plurality of types of bridge girder units A having different lengths are prepared. If these types are appropriately combined and connected to each other, within the limit of the design strength of the patrol bridge, the combination is set. The rising length can be freely changed according to the situation at the construction site. Taking into account the convenience of transportation to the site, the number of workers, and the like, for example, the walking plate unit B is transported to the erection site in a state in which the walking plate unit B is attached to the bridge girder unit A in advance, or The procedure of transportation and erection such as attaching
You can choose on the fly to be most efficient.

In the above configuration, the object of the present invention is achieved even if the detailed structure is appropriately changed in design. For example,
The tread plate 22 may be formed in a lattice shape or the like in addition to the net shape. Also, the combination structure of the vertical girder 1 and the horizontal girder 2 is, of course,
What is necessary is just to determine suitably according to the size of the bridge girder unit A so that it may be made lighter and stronger.

[0025]

As is apparent from the above description, the jumping steel patrol bridge according to the present invention has the following practically superior effects as compared with conventional ones, and as a whole,
Significant savings in cross-linking and maintenance costs. (A) The service life and safety at the time of crossing are improved as compared with Maruki Bridge. (B) Since the walking board unit is of the jump type so that the snow load is hardly taken into account, it can be made much lighter than a conventional steel bridge. (C) Also, in combination with the adoption of the divided structure, it can be installed relatively easily and in a short time in a mountainous place where a crane truck cannot enter or a place with a poor footing, using only human power. (D) By achieving remarkable weight reduction, the construction cost and construction cost of the patrol bridge can be significantly reduced. (E) The length of the patrol bridge can be changed freely according to the situation at the construction site. (F) The walking board unit in which the frame or the grid-like tread is stretched on the frame contributes to the reduction of the weight of the patrol bridge and the prevention of snow accumulation.

[Brief description of the drawings]

FIG. 1, showing an embodiment of the present invention, is a perspective view of a patrol bridge in a state where a walking board unit is flipped up.

FIG. 2 is a plan view of the bridge girder unit according to the first embodiment.

FIG. 3 is a side view of the bridge girder unit with the handrail attached thereto.

FIG. 4 is a side end view of FIG. 3;

FIG. 5 is a plan view of the walking board unit according to the first embodiment;

FIG. 6 is a side end view of a part of the patrol bridge, illustrating the state of attachment of the fixing means to the walking board unit and the operation thereof.

FIG. 7 is a plan view showing a patrol bridge in which two bridge girder units are connected, with one half of a group of walking board units cut away.

FIG. 8 is a side view of FIG. 7;

[Explanation of symbols]

 Reference Signs List A Bridge girder unit B Walking plate unit C Hinge part D Fixing means E Handrail 1 Vertical girder material 2, 3 Horizontal girder material 4a, 4b Pin insertion metal fittings 5 Post 6 Railing rod 7 Bolt hole 8 Connection metal fitting 21 Rectangular frame 22 Tread plate 23 Reinforcement bone DESCRIPTION OF REFERENCE NUMERALS 30 Stopper (fixing means) 31 Metal rod 32 Rotating plate 33 Hook 34 Pin 35 Long hole 36 Stopper 41 Connecting plate 42 Base plate

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masayuki Ezawa 7-2595 Shinokicho, Kasugai-shi, Aichi (Kasugai Ryo 210) (72) Inventor Sumio Hanada 1500 Iwasaki, Iwakizaki, Komaki-shi, Aichi Prefecture 1 Block No. 5 Building 602 F-term (reference) 2D059 BB17 BB21

Claims (6)

[Claims] 1. A bridge girder unit A in which a plurality of vertical girder members and horizontal girder members are connected in a rectangular frame shape, and a walking plate unit large enough to be placed on an upper surface of the bridge girder unit A. B, a hinge part C for connecting the side end of the walking plate unit B to the side end of the bridge girder unit A so as to be able to stand up and down, and fixing means D for fixing the upright state. Lifting steel patrol bridge. 2. The jumping steel patrol bridge according to claim 1, wherein the walking plate unit B has a structure in which a net or a grid-like tread is stretched over a rectangular frame. 3. The fixing means D has a base end connected to a side end of the walking plate unit B with a pin, and
The jumping steel patrol bridge according to claim 1, characterized in that it is a metal clasp provided with a hook portion to be locked to a handrail (E) erected at a side end of the bridge girder unit (A). 4. The bridge girder unit A to which the walking plate unit B is assembled is provided in a plurality of types having different lengths, and the required length is obtained by appropriately combining and connecting them. 2. The levitating steel patrol bridge according to claim 1, wherein the patrol bridge is configured to be a patrol bridge. 5. The jumping steel patrol bridge according to claim 1, wherein a plurality of said walking plate units B are assembled in tandem with each said bridge girder unit A. 6. The walking board unit B is detachably assembled to the bridge girder unit A.
Raised steel patrol bridge as described.