An extensible movable bridge assembly for use in building tunnels

Abstract

 An extensible bridge assembly is disclosed for performing, in a tunnel being built, tunnel build­ing operations such as the loading of mines, affixing of reinforcing ribs, laying of nets and the like.
This extensible bridge assembly essentially comprises a bridge frame (1), affixed to a truck, on the chassis (3) of which there are articulated two raising arms (12, 17), bearing a counter-platform (18) which, in turn, sup­ports a platform (21) provided with legs (30).
These component parts, in particular, com­prise piston oleodinamic systems (14, 23, 30) to drive the component parts in an independent way from one another.
The truck is substantially used both as a stabilizing ballast, for stabilizing a bridge assembly being extended, and as a transport means, to be used as the bridge assembly is closed and the stabilizer elements (5) raised.

Description

BACKGROUND OF THE INVENTION

[0001] The present invention relates to an extensible movable bridge assembly, comprising several cooperating parts for performing, in a tunnel being built, opera­tions such as the loading of mines, laying of reinforcing ribs and nets and the like.

[0002] The aim of the present invention, is to pro­vide such an extensible movable bridge assembly which can be quickly and easily moved and installed.

[0003] Within the scope of the above mentioned aim, a main object of the invention is to provide such an ex­tensible movable bridge assembly which is very simple construction wise and very reliable in operation.

[0004] According to one aspect of the present inven­tion, the above mentioned aim and objects, as well as yet other objects, which will become more apparent here­inafter, are achieved by an extensible movable bridge assembly for use in building tunnels, characterized in that said bridge assembly comprises a bridge frame, coupled to a truck, said truck having a truck chassis on which two raising arms are pivoted, said raising arms bearing a counter-platform which, in turn, sup­ports a platform provided with legs, oleodynamic piston means being moreover provided for raising said compo­nent parts in an independent way from one another.

BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Further characteristics and advantages of the extensible movable bridge assembly according to the pre­sent invention, will become more apparent from the follow­ing detailed description of a preferred, though not ex­clusive, embodiment of the extensible movable bridge assembly according to the invention which is illustra­ted, by way of an indicative but not limitative example, in the accompanying drawings, where:

Figure 1 is a side view illustrating the sub­ject extensible movable bridge assembly mounted on a truck and in its fully closed and fully open positions;

Figure 2 is a rear view of the extensible bridge assembly in its fully closed and fully open po­sitions.

DESCRIPTION OF THE PREFERRED EMBODIMENT

[0006] With reference to the figures of the accompa­nying drawings, the extensible movable bridge assembly for making tunnels according to the invention, com­prises a bridge frame, overally indicated at the re­ference number 1, which is affixed, by four brackets 2, to the chassis of a truck 3.

[0007] The bridge frame essentially comprises four section members HE, (4), extending horizontally and weld­ed, at respective end portions thereof, to two section members "HE", of like cross-section, so as to define a rectangular construction.

[0008] At the corners of this rectangular construc­tion there are are provided corresponding stabilizing pistons 5 which are bolted to welded metal sheet box-­like bodies 6.

[0009] To these section members HE (4), there is welded a central body 7, made of welded sheet metal and which is arranged at the cabin of the truck.

[0010] This central body comprises four hinges for pivotably coupling raising arm members for raising a counter-platform which will be disclosed in a more detailed way hereinafter.

[0011] There are moreover provided a first access ladder 8, two guard walls 9 and 10 and a second ladder 11 for accessing the platform.

[0012] The top raising arm, indicated at 12, com­prises four C-shape section members welded in pairs and mutually spaced by a L-shape section member latti­ce 13.

[0013] This top raising arm bears a hinge coupling portion for pivotably coupling the head portion of a raising piston 14 which is also articulated to the beams 4 of the frame.

[0014] The top arm, moreover, is articulated, at one end thereof, to the central body and, at the other end thereof, to a central body 15 for supporting the above mentioned counter-platform.

[0015] As the arm 12 is arranged at a lowered posi­tion, it will rest, through the legs 16, on the frame 1.

[0016] With the above disclosed raising arm 12 co-­operates, at the bottom, a second raising arm 17, also made of four C-shape section members, welded in pairs and mutually spaced by a L-shape section member lattice 13′.

[0017] This second raising arm, in turn, is pivoted, at one end thereof, to said central body 7 and, at the other end thereof, to the central body 15 of the coun­ter-platform 18.

[0018] The above mentioned central body 15 is made of a welded and suitably ribbed metal sheet, and bears the pivot hinges for the raising arms 12 and 17.

[0019] The counter-platform, in turn, comprises beams HE, (19), welded to the central body 15 and bear­ing horizontal rollers 20 on which a platform, overal­ly indicated at 21, can slide.

[0020] There are moreover provided vertical-axis rollers 22 for laterally restraining the sliding plat­form 21 on the counter-platform 18.

[0021] The above platform, in particular, is driven by a cylinder 23 which is respectively pivoted to said platform and counter-platform 18.

[0022] The platform 21 comprises moreover guard walls 24, a floor 25, made of HE and IPE beams, a sheet metal covering, as well as abutment rollers 26 for said beams 19, which rollers are provided for sliding said plat­form along said counter-platform 18.

[0023] A leg bearing frame 27 is moreover provided, made of square-cross-section tubular elements, in the inside of said frame 27 there being provided tracks 28, made of C-shape section members, and bearing a panel on which slide the wheels 29 of leg or wing mem­bers 30.

[0024] These legs are arranged under the mentioned floor 25 and are included in said frame 27 which, on vertical sides thereof,supports roller pairs 31 for re­straining said legs.

[0025] Said legs, in particular are provided with removable galleries 32 and comprise a respective piston 33 for driving said legs to perform extension and with­drawing movements.

[0026] A main feature of the invention is that in the subject extensible movable bridge assembly, the stabilizing elements, raising arms, platform and legs are driven by means of independent drives.

[0027] From the above disclosure it should be appa­rent that the invention fully achieves the intended aim and objects.

[0028] While the invention has been disclosed and illustrated with reference to a preferred embodiment thereof, it should be apparent that the disclosed embo­diment is susceptible to several modifications and va­riations all of which will come within the spirit and scope of the appended claims.

Claims

1. An extensible movable bridge assembly, for use in making tunnels, characterized in that said bridge assembly comprises a frame fixed to a truck on the chassis of which there are pivoted two raising arms bearing a counter-platform, said counter-platform sup­porting a platform provided with leg members, oleo­dynamic piston means being moreover provided for driv­ing said component parts in an independent way from one another,

2. An extensible movable bridge assembly, according to claim 1, characterized in that said frame is affixed to said truck chassis by four brackets, said frame comprising four section members HE, hori­zontally extending and welded, at end portions there­of, to two section members HE, of like cross-section, so as to define a rectangular construction, stabilizing pistons being affixed to the corners of said construc­tion and bolted to welded sheet metal box-like bodies.

3. An extensible movable bridge assembly, according to one or more of the preceding claims, cha­racterized in that said assembly further comprises a central body welded to said section members HE, said central body being made of welded ribbed sheet metal and arranged at the cab of said truck, said central body including four hinges for pivotably coupling the arms for raising said counter-platform, said bridge further comprising a first ladder, two guard walls, a second ladder for accessing said platform and the seat for the articulated coupling of the base of the raising piston.

4. An extensible movable bridge assembly, according to one or more of the preceding claims, cha­racterized in that the top raising arm comprises four C-shape section members welded in pairs and mutually spaced by a L-shape section member lattice, said top raising arm bearing a hinge coupling for the head of said raising piston which is also pivoted to the beams of said frame, said top arm being articulated, at one end thereof, to the central body of said frame and, at the other end thereof, to a central body supporting said counter-platform.

5. An extensible movable bridge assembly, according to one or more of the preceding claims, cha­racterized in that the bottom raising arm comprises four C-shape section members welded in pairs and mutually spaced by a L-shape section member lattice, said bottom raising arm being pivoted,at one end there­of, to said central body and, at the opposite end thereof, to the central body of said counter-plat­ form.

6. An extensible movable bridge assembly, according to one or more of the preceding claims, cha­racterized in that said central body of said counter-­platform is made of a welded and ribbed sheet metal and bears the hinges for pivotably coupling said rais­ing arms, said counter-platform comprising HE beams, welded to said central body and bearing horizontal rollers thereon a platform can slide, vertical axis rollers being moreover provided for slidingly displa­cing said platform on said counter-platform.

7. An extensible movable bridge assembly, according to one or more of the preceding claims, cha­racterized in that said platform comprises guard walls, a walking floor made of HE and IPE beams, with a sheet metal covering, and abutment rollers for the beams of said counter-platform, said abutment rollers being adapted to allow for said platform to slide along said counter-platform.

8. An extensible movable bridge assembly, according to one or more of the preceding claims, cha­racterized in that with said platform there is rigid a leg bearing frame made of square cross-section tubular elements, in the inside of which there are provided C-shape section member tracks bearing a panel thereon slide the wheels of said legs, said legs being arranged under said walking floor and being held in said frame which also supports vertical roller pairs for restrain­ing said legs.

9. An extensible movable bridge assembly, according to one or more of the preceding claims, cha­racterized in that said legs are provided with removable galleries and comprise each a respective piston for driving a said leg to perform extending and withdrawing movements, said piston being pivoted to its respective leg and to the leg bearing frame.

Drawing