JPH055996B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <<Industrial Application Field>> The present invention relates to an apparatus for assembling reinforcing bars used in a shield construction method, and particularly to an apparatus for assembling reinforcing bars embedded in cast-in-place lining concrete.

<Conventional Technology> As is well known, there is a cast-in-place lining concrete method as a type of tunnel construction method.
In this construction method, the lining concrete for the primary lining is generally poured and formed when the shield excavator is propelled, and then the secondary lining is applied to the inner surface of the primary lining.

However, this method of forming tunnel walls in two stages takes a long time, so recently it has been
Research has been conducted into forming tunnel walls using only lining, and in this case reinforcing materials, such as reinforcing bars, are buried in the lining concrete to ensure the strength of the tunnel walls.

The reinforcing bars are assembled in a ring shape that follows the cross section of the tunnel to be constructed, but if they are assembled in advance, it will be difficult to move and install them, so considering workability, etc.
Usually, it is made into arc-shaped reinforcing bar units by dividing them into multiple pieces in the circumferential direction, and then assembling them at the site where the lining concrete is being poured.

By the way, when placing lining concrete, a formwork that is assembled in a ring shape is installed.
Concrete is poured with reinforcing bars installed between the excavated ground and the formwork.

Therefore, if the reinforcing bar unit is set in advance on the outside of the formwork before construction is carried out, the reinforcing bar assembly work becomes easier, and a means for assembling the reinforcing bar is disclosed in, for example, Japanese Patent Application Laid-Open No. 141997/1983.

However, the means disclosed in the above publication has the following problems.

<<Problems to be Solved by the Invention>> In other words, the assembly means disclosed in the above-mentioned publication integrates reinforcing bar units on the outer surface of the formwork via a plurality of clampers, and assembles them by a rotationally driven erector. However, reinforcing bar units are usually assembled in a ring shape with their ends overlapping each other.

In this case, if the reinforcing bar unit is integrated with the formwork, the reinforcing bar unit cannot be independently rotated, so when assembling the reinforcing bar unit into an annular shape, variations in overlap length tend to occur, which is difficult to correct.

In order to avoid such problems, it is possible to accurately determine the mutual positional relationship when clamping the reinforcing bar units to the formwork, but such a solution reduces the workability of assembling the reinforcing bars. .

This invention was made in view of these conventional problems, and its purpose is to:
It is an object of the present invention to provide a reinforcing bar assembly device for shield construction method which can assemble reinforcing bar units accurately and quickly.

<<Means for Solving the Problems>> In order to achieve the above object, the present invention provides a shield in which a tunnel is constructed by burying a reinforcing bar cage in which reinforcing bar units divided along the circumferential direction are assembled in a ring shape into lining concrete. A reinforcing bar assembly device used in the construction method includes a pedestal installed along the axial direction of the tunnel, a bogie running on the pedestal, and an annular frame supported by the bogie and extending in the cross-sectional direction of the tunnel. It is composed of a guide rail, and a clamp arm that moves along the guide rail, expands and contracts in the radial direction of the tunnel, and is separably coupled to the reinforcing bar unit.

<<Operation>> According to the assembly device with the above configuration, the clamp arm connected to the reinforcing bar unit moves along the annular guide rail supported by the cart running on the pedestal, so the cart can be moved to the rear of the casting site. After moving and connecting the reinforcing bar unit to the clamp arm, it is carried to the casting site, moved along the annular guide rail in the cross-sectional direction of the tunnel and positioned, and then the clamp arm is extended and the end Connect them to assemble a circular reinforcing cage.

In this case, the clamp arm can be stopped at any location on the annular guide rail, and the stopping position can also be easily corrected, so that the reinforcing bar unit can be accurately and quickly assembled into the annular reinforcing bar cage.

<<Example>> Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 1 and 2 show an embodiment of a reinforcing bar assembly apparatus used in the shield construction method according to the present invention.

The assembly device shown in the figure is used for assembling an annular reinforcing bar cage 10, an example of which is shown in FIG. Each reinforcing bar unit 12 is composed of a plurality of arcuate reinforcements 14 and a plurality of vertical reinforcements 16 that connect these.

The assembly device includes a pedestal 18 installed along the axial direction of the tunnel to be constructed, a bogie 24 having wheels 22 that run on rails 20 laid on the pedestal 18, and a cross section of the tunnel supported by the bogie 24. It is generally composed of an annular guide rail 26 extending in the direction, and a clamp arm 28 that is separably coupled to the reinforcing bar unit 12.

In this embodiment, the guide rails 26 are a pair of curved frame members with an I-shaped cross section, and the rails 26 are arranged facing each other at a predetermined distance in the tunnel axis direction, and a portion of the lower part is cut off. A roller chain 30 is fixed to the outer peripheral surface of one rail 26 over its entire circumference, and a stopper 32 and a limit switch 34 are provided at both ends of the roller chain 30, respectively.

The clamp arm 28 is attached to the guide rail 2
a base 38 which pivotally supports a plurality of guide rollers 36, 36 fitted between flanges of 6; an outer cylinder 40 extending through the base 38 so as to be oriented in the radial direction of the tunnel; A rotation motor 48 has a lock rod 42 inserted into the rod 40, a presser plate 44 attached to the tip of the rod rod 42, and a driving gear 46 supported by a base 38 and meshed with the roller chain 30 fixed to a rotating shaft. and a telescoping motor 52 having a pinion 50 fixedly attached to a rotating shaft, which is supported by the outer cylinder 40 and meshes with the rack 42.

With the above configuration, when the rotation motor 48 is driven, the clamp arm 28 moves in the cross-sectional direction of the tunnel along the guide rail 26, and when the expansion and contraction motor 52 is driven, the rack rod 42 expands and contracts in the radial direction of the tunnel.

Note that the member 54 shown in FIG. 1 is an auxiliary roller for preventing the wheels 22 of the truck 24 from coming off the rail 20 or floating up, and the member 56 is for regulating the expansion and contraction of the rack rod 42. It is a limit switch for

To assemble the reinforcing bar cage 10 using the assembly apparatus configured as described above, first, the reinforcing bar unit 12 prepared in advance is coupled to the clamp arm 28 by moving the cart 24 to the rear of the casting site.

In this case, the lock rod 42 of the clamp arm 28 is in a retracted state, and for example, the U bolt 58 is positioned in the middle of the arcuate reinforcement 14, and the U bolt 58 is tightened with both ends of the presser plate 44 in contact with the arcuate reinforcement 14. , the reinforcing bar units 12 can be firmly connected by the elastic force of the arcuate bars 14.

When the reinforcing bar unit 12 and the clamp arm 58 are connected, the cart 24 is moved to the casting site, and the rotation motor 48 is driven to move the clamp arm 58 along the guide rail 26 to a predetermined position.

Thereafter, the expansion motor 52 is driven to extend the clamp arm 28, and the ends of the vertical reinforcements 16 are placed in the lining concrete 60, which has already been cast.
It is connected by welding or the like to the vertical reinforcement 16 protruding from the end of the U-bolt 58, and the connection is released by removing the U-bolt 58.

Then, by repeating the same operation one after another, the ends of the reinforcing bar units 12 are connected in an overlapping state in the circumferential direction and the axial direction, and the reinforcing bar cage 10 is assembled.As shown in FIG. After installing the formwork 62 and pouring concrete into a space 67 defined by the ground mass 64, the formwork 62, and the press ring 66 of the shield excavator, the concrete is compressed with a press jack 68 to form a tunnel wall. do.

In this case, the vertical bars 16 of the reinforcing bar cage 10 are made to pass through the press ring 66 for joining with the next reinforcing bar cage 10.

Now, in the assembly apparatus of the present invention that assembles the reinforcing bar cage 10 as described above, the clamp arm 28 is driven by the rotation motor 38 to move along the guide rail 26 in the cross-sectional direction of the tunnel, and stops at an arbitrary position. Therefore, the reinforcing bar units 12 connected thereto can be assembled into the reinforcing bar cage 10 while accurately overlapping each other.

<<Effects of the Invention>> As described above in detail in the embodiments, according to the reinforcing bar assembly apparatus used in the shield construction method according to the present invention, reinforcing bar units can be accurately and efficiently assembled into a reinforcing bar cage while overlapping each other. I can do it.

[Brief explanation of drawings]

FIG. 1 is a front view of the apparatus of the present invention, FIG. 2 is a side view of the same, FIG. 3 is an assembled diagram of a reinforcing bar cage, and FIG. 4 is an explanatory diagram of a state in which lining concrete is placed. 10... Rebar cage, 12... Rebar unit, 18
... mount, 24 ... trolley, 26 ... guide rail,
28...Clamp arm.

Claims (1)

[Claims] 1. In a reinforcing bar assembly device used in the shield construction method in which a tunnel is constructed by embedding a reinforcing bar cage in which reinforcing bar units are assembled in a ring shape by dividing reinforcing bar units along the circumferential direction into lining concrete, the reinforcing bar assembly device is installed along the axial direction of the tunnel. a pedestal, a bogie running on the pedestal, an annular guide rail supported by the bogie and extending in a cross-sectional direction of the tunnel;
A reinforcing bar assembly device for use in the shield construction method, comprising a clamp arm that moves along the guide rail, expands and contracts in the radial direction of the tunnel, and is separably coupled to the reinforcing bar unit.