JPH08338006A - Pier for construction work in tunnel - Google Patents

Abstract

PURPOSE: To improve workability by mounting a horizontally rotatable inclined plate in front of a movable pier, installing the pier at the central section of tunnel width and alternately placing invert concrete left and right. CONSTITUTION: A pier 5 for tunnel construction works, in which inclined plates 4 capable of being suspended are set up before and behind a fixed section 1 movable by wheels 10 and the inclined plate 4 in front is fitted rotatably in the horizontal direction, is installed at the central section of tunnel width. An unexcavated invert section B is excavated as alternately rotating the front inclined plate 4 left and right while concrete C is placed on an excavated invert section D, and the pier 5 is shifted successively as the excavation of a tunnel progresses. An internal-surface lining device (a centering) movable while crossing over the pier 5 is mounted, and the lining works of the tunnel is conducted in parallel with excavation operation. Accordingly, execution works can be performed efficiently.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pier for construction in a tunnel used for invert construction work.

[0002]

2. Description of the Related Art Conventionally, the work of placing concrete in the invert (floor portion) of the tunnel 53 is performed by excavating the invert of the tunnel 53 (invert excavation work), and Then, concrete is placed in the excavation site (invert concrete placement work), and then backfilling (hereinafter, this series of work is called invert construction work) is performed one by one, and the face is cut from the side This is a procedure for sequentially proceeding with this invert construction work toward the side (see Fig. 1). 51 in Figure 1
Is the invert concrete pouring end point, and 52 is the invert unexcavated point.

By the way, this invert construction work must be carried out so as not to hinder the work of carrying out the excavated earth and sand generated by the excavation work being carried out by the face at the same time out of the tunnel. That is, it is indispensable that a passage for work vehicles and the like from the face to the entrance is secured during the invert construction work (see FIG. 1). In addition to excavation work using a face, it is also necessary to secure a passageway for work vehicles for concrete placing work on the side wall of the tunnel.

Therefore, a pier 41 to be erected at the invert construction work site, that is, a drawing for a work vehicle to be erected between the pier 41 which is backfilled after the completion of the invert concrete pouring work and the invert unexcavated work site 43 Pier illustrated in 2
41 have been proposed.

However, this pier 41 has a drawback that the invert construction work on the lower side of the pier 41 is troublesome and the work efficiency is poor.

In order to solve such a problem, a jetty 24 for invert construction work (hereinafter referred to as a conventional example) as shown in FIG. 3 has been proposed in recent years. The jetty 24 according to this conventional example is one in which inclined plates 22 and 23 that slide relative to the central portion 21 are provided in front of and behind the central portion 21, and the central portion 21 of the jetty 24 extends over the entire width of the tunnel. Rail extended
25 is attached via an appropriate lifting means 28 such as a hydraulic mechanism,
Wheels 26 for moving the central portion 21, that is, the pier 24 in the tunnel length direction are provided on the back surface of the central portion 21.

A rolling element 27 for rolling on the rail 25 and moving the jetty 24 in the width direction of the tunnel is provided on the back surface of the jetty 24.

In this conventional example, the pier 24 is wheeled at a predetermined position.
The pier 24 is erected between the location 29 and the invert unexcavated work location 30 that were moved back using the 26 and after the invert concrete placement was completed (the reference numeral 31 indicates that the invert excavation work has been completed, (It is a place where concrete is not yet laid.), The rail 25 is lowered and grounded by the appropriate lifting means 28, and the wheels 26 are lifted from the ground. Then, in this state, the pier 24 is rolled to one side in the width direction of the tunnel.
27 and move the pier 24 to secure the passage, and perform the invert concrete placing work and backfilling work on the side of the pier 24, and then move the pier 24 to the opposite side and perform the same work. It is a thing.

However, it was confirmed that the above conventional example has the following problems.

In the conventional example, when a passage is secured by the pier 24, the pier 24 is always on one side in the tunnel width direction, that is,
It will be located as close as possible to the side wall of the tunnel.

By the way, at the same time as the invert construction work, the work of placing concrete on the inner peripheral surface (side wall and ceiling portion) of the tunnel is performed.

This operation is carried out by a gate-type device (generally referred to as a center 32) arranged in the excavated tunnel hole 35 as shown in FIG.

The width L of the opening 33 of the center 32 is generally such that one work vehicle can pass through, and the pier 24 has a width of about 1/2 of the tunnel width. Therefore, when the pier 24 is located on one side in the tunnel width direction, if the centle 32 is brought as close as possible to the pier 24, the work vehicle 34 passing through the opening 33 of the centle 32 will cross the pier 24. There is a problem that it cannot be passed (see Fig. 5). Therefore, under the present circumstances, it is necessary to maintain the distance between the pier 24 and the center 32 at a predetermined interval to proceed with each work, which causes a decrease in work efficiency. Although the tunnel is required to be quickly closed by solidifying the inner surface with concrete and further hardening the invert, the pier 24 and the center 32
The work taking into account the distance between and causes a drastic decrease in work efficiency.

By the way, if the pier 24 is located at the center in the width direction of the tunnel, such a problem will be solved.
The conventional example of such a structure is meaningful only when the 24 is brought as close as possible to the side wall of the tunnel.Since the jetty 24 cannot be brought as close as possible to the side wall of the tunnel, the conventional example has the feature. I can't show enough.

Further, in the conventional example, since there are two grounded rails 25 at a predetermined interval in the tunnel width direction, the rails 25 hinder the invert construction work. Further, in the conventional example, when the tunnel is bent, the pier 24 cannot be brought as close as possible to the side wall of the tunnel, and this also hinders the invert construction work.

The present invention provides a jetty for construction in a tunnel which solves the above problems.

[0017]

The gist of the present invention will be described with reference to the accompanying drawings.

A jetty 5 provided with a moving portion 3 used for placing concrete in an invert of a tunnel, the jetty 5 being a movable portion which rotates horizontally with respect to the fixed portion 1 and the fixed portion 1. The present invention relates to a pier for construction in a tunnel, which is characterized by being configured with a part 2.

In the pier for construction in a tunnel according to claim 1, the pier 5 is fixed on the movable portion 3 on the moving side 3 as the pier 5.
The pier 5 is adopted in which the movable part 2 is fixed to the moving part 3 and the movable part 2 is provided on the face of the moving part 3 which horizontally rotates about the face side of the moving part 3 as a fulcrum. It relates to the pier for construction in the tunnel.

In the pier for construction in a tunnel according to any one of claims 1 and 2, the fixed portion 1 and the movable portion 2 are provided with wheels 10 to form a moving portion 3, and the fixed portion 1 and the movable portion 2 are a working vehicle. A pier for construction in a tunnel, characterized in that a sloping plate 4 is provided to enable the pedestal and the like to be climbed up, and the sloping plate 4 can be lifted upwards with respect to the fixed part 1 and the movable part 2, respectively. Is.

[0021]

[Operation] Move the pier to an appropriate position in the tunnel,
The fixed part is located almost in the center in the width direction of the tunnel, the movable part is horizontally rotated by a predetermined angle to secure a passage for the work vehicle, and the invert construction work is performed on the side of the movable part. Rotate to the opposite side and perform the invert construction work on the same side.

[0022]

EXAMPLE This example is a pier 5 provided with a fixed portion 1 on the side of the mouth and a movable portion 2 which rotates on the face of the face 1 at a predetermined angle in the horizontal direction with respect to the fixed portion 1. The pier 5 is provided with an inclined plate 4 at the ends of the fixed part 1 and the movable part 2 so that a work vehicle can ride on the pier 5, and the inclined plate 4 has the fixed part 1 and the movable part 2 respectively. It is provided so that it can be lifted and slid upward. A trolley 9 with wheels 10 as a moving unit 3 is provided below the pier 5, and the pier 5 is movable in the tunnel length direction.

A detailed description will be given below.

About the pier 5. As described above, the pier 5 has a structure including the fixed portion 1 with the inclined plate 4 and the movable portion 2 with the inclined plate 4. The fixed portion 1 is a fan-shaped plate body in plan view. A plate-shaped movable portion 2 is continuously provided at the tip, and the movable portion 2 is pivotally attached to the back surface of the fixed portion 1 (reference numeral 16 is a pivotal attachment portion). The step portion of the movable portion 2 that abuts the fixed portion 1 is formed as a concave curved edge that matches the tip edge of the fixed portion 1. About the inclined plate 4. The inclined plate 4 is connected to the end portions of the fixed portion 1 and the movable portion 2 and is configured to be vertically slidable by a hydraulic cylinder 6 with the connected portion as a shaft portion. In addition, reference numeral 7 is a suspension body for moving the inclined plate 4, and 8 is a support.

Regarding the carriage 9. This dolly 9 is the pier 5
It is provided on the lower side of the vehicle, and the carriage 9 is provided with wheels 10 for moving the pier 5 back and forth (in the tunnel length direction). This dolly 9 is fixed on the back surface of the fixed portion 1, and on the back surface of the movable portion 2 there are two rails 11 and wheels.
It is attached through 12. That is, two rails 11 are fixed to the upper part of the trolley 9 on the face side in FIG.
A wheel 12 is attached to the rear surface of the wheel 12, and the wheel 12 rolls on a rail 11 so that the movable portion 2 horizontally rotates about a fixed portion 1 (carriage 9) with a pivotal portion 16 as a fulcrum. (See FIGS. 6, 8 and 9). Reference numeral 13 floats the wheel 10, or
A hydraulic jack for grounding the wheel 10, a grounding body 14 connected to the hydraulic jack 13, and a handrail for an operator 15.

This embodiment is constructed as described above, and the invert construction work is carried out as follows using this embodiment.

First, with the inclined plate 4 being lifted, the pier 5 is moved forward by the carriage 9 to an appropriate position in the tunnel, the rod of the hydraulic jack 13 is extended, and the grounding body 14 is grounded. After fixing, the movable part 2 is rotated leftward in the horizontal direction by a predetermined angle, and subsequently, the slope plate 4 on the mouth side is refilled after the end of the invert concrete placement, at a position A.
Further, the slope plate 4 on the face side is brought into contact with the unexcavated concrete work site B of the invert concrete, and the backfilled place A and the unexcavated work site B of the invert concrete are completed.
The pier 5 is erected between the above and the pier (refer to FIG. 6, reference numeral C is a portion where the invert concrete pouring is completed, and D is a portion where the invert excavation work has been completed but concrete has not been poured yet). . In this state, the invert construction work around the pier 5 is performed. Reference numeral 17 is an excavator.

The movable portion 2 is rotated to the opposite side as shown in FIG. 7, and the invert construction work is performed in the same manner.

Subsequently, when the invert construction work in a predetermined area (refilling on the end point C of the invert pouring, re-excavation work of the invert concrete B, pouring of the invert concrete, etc.) is completed in this way, both inclines are completed. Board 4
To move the movable part 2 back to its original position, that is, to make the fixed part 1 and the movable part 2 linear, shorten the hydraulic jack 13 to ground the wheel 10, and move the pier 5 forward (Fig. 8). By repeating this, the invert construction work is sequentially advanced to the face.

Therefore, according to the present embodiment, it is possible to carry out the invert construction work while ensuring the passage for carrying out the excavated earth and sand from the face.

Therefore, according to the present embodiment, since the fixed portion 1 is always located in the center in the tunnel width direction, even if the centle 32 is brought as close as possible to the jetty 5 according to the present embodiment, the centle 32 is moved from the jetty 5 to the jetty 5. The work vehicle 34 does not become inaccessible to the work, and therefore work can be carried out without managing the distance between the pier 5 and the center 32, so that quick work can be carried out and work efficiency is improved. .

In addition, in this embodiment, since there are no two rails which are grounded and are full in the width direction of the tunnel, the pier 5
Inverting construction work on the side of can be performed well.

Further, in this embodiment, since the movable portion 2 can be rotated with respect to the fixed portion 1,
Even if the tunnel is bent, the invert work can be done without any problems.

[0034]

As described above, according to the present invention, when securing the passage in the tunnel, the fixed portion is located substantially in the center in the tunnel width direction, and the movable portion is at a predetermined angle with respect to the fixed portion in plan view. Since it will be connected in a state, the work vehicle will not be impeded even if the Centle is brought as close as possible to the jetty according to the present invention. Becomes

[Brief description of drawings]

FIG. 1 is an explanatory front sectional view of an invert construction work.

FIG. 2 is an explanatory side sectional view of a pier 41.

FIG. 3 is an explanatory plan view of a conventional example.

FIG. 4 is an explanatory front view of the above.

FIG. 5 is an explanatory plan view of the above.

FIG. 6 is an explanatory side sectional view of the present embodiment.

FIG. 7 is an explanatory plan view of the present embodiment.

FIG. 8 is an explanatory side sectional view of the present embodiment.

FIG. 9 is a perspective view of a main part of this embodiment.

[Explanation of symbols]

 1 Fixed part 2 Movable part 3 Moving part 4 Sloping plate 5 Pier 10 Wheels

Claims (3)

[Claims] 1. A pier provided with a moving part used when placing concrete in an invert of a tunnel,
The jetty for construction in a tunnel, wherein the jetty is composed of a fixed portion and a movable portion that rotates in a horizontal direction with respect to the fixed portion. 2. The jetty for construction in a tunnel according to claim 1, wherein the fixed portion is fixed on the moving side as a jetty and on the side of the opening, and the opening of the moving portion is on the side of the face facing the moving section. A pier for construction in a tunnel, which uses a pier that has a movable part that rotates horizontally with the lateral side as a fulcrum. 3. The pier for construction in a tunnel according to any one of claims 1 and 2, wherein wheels are provided in a fixed portion and a movable portion to make a moving portion, and a work vehicle or the like is ridden on the fixed portion and the movable portion. A pier for tunnel construction, wherein a sloping plate for enabling the sloping plate is provided, and the sloping plate can be lifted upward with respect to the fixed portion and the movable portion, respectively.