JPH07217388A - Leveling method for concrete in bottom of tunnel - Google Patents

Abstract

PURPOSE:To promote work efficiency by laying a rail with anchor bolts mounted to the lower parts on both sides of a secondary lining form, traveling the body frame along the rail, and leveling concrete with a leveling machine borne thereon. CONSTITUTION:A leveling machine 1 is traveled on concrete placed to the bottom of a tunnel 51, screw wings 11 are revolved and driven, and a vibrator 27 is driven. After that, the leveling machine 1 is traveled by revolving wheel bodies 903 with a motor 9, and concrete leveling work is repeated. Then, with the traveling of the leveling machine 1, first of all, unevennesses on the surface of concrete are roughly leveled with the screw wings 11 so that they are leveled even, and then, a first trowel 15 vibrated by the vibrator 27 passes on the surface thereof to level roughly the surface again. Furthermore, a second trowel 17 vibrated by the vibrator 27 passed the surface, and finish leveling is made with the second trowel 17. According to the constitution, the efficiency of concrete leveling work can be promoted.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for leveling concrete at the bottom of a tunnel.

[0002]

2. Description of the Related Art For example, in tunnel construction, the construction of invert concrete is conventionally performed as follows. First, a tunnel is excavated by an excavator. Next, a primary lining is applied to the wall surface of the excavation hole. Next, the secondary lining formwork is assembled so as to face the primary lining face, and concrete is filled between the primary lining face and the secondary lining formwork. Next, concrete is placed on the bottom of the tunnel. Next, the concrete cast at the bottom of the tunnel is leveled manually. Next, a trowel of a predetermined length is attached to the rail travel carriage, and the concrete surface is pressed by the trowel weight with the weight of the carriage as the carriage travels, and finishing is performed.

[0003]

As described above, the conventional invert concrete construction method has a low work efficiency because it requires leveling work by human power, and the trowel is simply moved as the trolley travels. Since this is a system, there are problems such as variations in finishing accuracy. The present invention has been devised in view of the above circumstances, and an object of the present invention is to provide a method for leveling concrete at the bottom of a tunnel, which can improve work efficiency and can easily improve finishing accuracy. To do.

[0004]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention is directed to leveling concrete put in the bottom of a tunnel, and lowering both sides of a secondary lining formwork to be installed during secondary lining. In addition, a large number of anchor bolts are attached at intervals in the longitudinal direction of the tunnel, the secondary lining formwork is removed after the secondary lining, and the anchor bolts remaining on both lower sides of the secondary lining surface are used for the tunnel. Rails are laid along the longitudinal direction of the vehicle, and while the vehicle body frame is running along the rails, the concrete is leveled by the concrete leveling means supported by the vehicle body frame.

Further, the present invention is characterized in that the rails are laid on both lower sides of the secondary lining surface, respectively. Also,
The present invention is characterized in that the rail is provided with a support piece for supporting the rail, and the support piece is fastened to the anchor bolt. Further, in the present invention, the concrete leveling means is provided at the front end of the vehicle body frame so as to extend in the width direction of the tunnel, and includes screw blades for leveling the concrete in the width direction of the tunnel by rotating. Characterize. Further, the present invention is characterized in that the concrete leveling means comprises a trowel for concrete leveling which is supported at a vehicle body frame position behind the screw blades and extends in the width direction of the tunnel. Further, the present invention is characterized in that a vibrator is connected to the iron.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an illustration of the secondary lining of a tunnel. 5
Reference numeral 1 denotes an excavated tunnel, 53 denotes a primary lining surface, a secondary lining form 55 (slide center) is installed facing the primary lining face 53, and the primary lining face 53 and the secondary lining form are provided. The space K between 55 and 55 is filled with concrete.
The secondary lining formwork 55 is fixed by a large number of hydraulic cylinders 59 and the like. Most of such a secondary lining form 55 is provided extending in the longitudinal direction of the tunnel 51, travels by the traveling carriage 61, and after the secondary lining, the next location is secondary lining. It moves sequentially in the tunnel 51.

Anchor bolts for attaching lighting equipment and various pipes to the secondary lining surface 63 are removably attached to appropriate positions of the secondary lining formwork 55. A number of anchor bolts 57 for rail mounting are detachably attached to the lower portions of both sides of the next lining form 55 at intervals in the longitudinal direction of the tunnel 51. When the secondary lining form 55 is manufactured, the anchor bolts 57 are attached to the secondary lining form 55 through a bracket or the like in the factory, so that the anchor bolts 57 can be easily and accurately attached. Has been done. Therefore, if the space K between the primary lining surface 53 and the secondary lining form 55 is filled with concrete and the secondary lining form 55 is removed after being cured, the secondary lining surface 63 can be removed with high accuracy. The embedded anchor bolt 57 remains.

Then, utilizing the anchor bolts 57, as shown in FIG. 3, both side walls 630 of the secondary lining surface 63.
A rail 65 is laid at the bottom of 1. The rail 65
Are mounted on a large number of support pieces 67 arranged at intervals in the longitudinal direction of the rail 65. The support piece 67 has a support piece portion 670 on which the rail 65 is mounted and attached.
1 and the secondary lining surface 6 formed by bending from the supporting piece portion 6701.
3, the supporting piece 67 abuts the mounting piece portion 6703 on the secondary lining surface 63, and attaches the mounting piece portion 6703 by the anchor bolt 57 and the nut 69. The part 6703 is installed by being fastened to the secondary lining surface 63.

Next, the concrete leveling machine used in the method of the present invention will be described. 2 is a plan view of the concrete leveling machine, FIG. 3 is a front view thereof, and FIG. 4 is a side view thereof. Reference numeral 1 is a concrete leveling machine. The concrete leveling machine 1 is arranged at a front end of the main frame 7 and a main frame 7 (corresponding to a vehicle body frame), a traveling drive means 9 for traveling the main frame 7 on a rail 65. Screw screw 11
And a rotation drive means 1 for driving the screw blades 11 to rotate.
3 and a first iron 15 and a second iron 17 arranged behind the screw blade 11.

The traveling drive means 9 comprises a main frame 7
Of the traveling frames 901 provided on the left and right sides of each of the traveling frames 901, a wheel 903 supported by the traveling frames 901 at a front-rear interval with engagement with the rail 65, and a motor 905 mounted on each traveling frame 901. And a chain sprocket mechanism 909 that connects the output shaft of the continuously variable transmission 907 and the wheel 903 to each other. The traveling frame 90
1 is a main frame 7 via front and rear male screw members 911.
The height of the main frame 7 is adjusted by the rotation of the male screw member 911, and the heights of the screw blade 11, the first and second trowels 15 and 17 are thereby adjusted.

The screw blade 11 is provided so as to extend in the width direction of the tunnel 51, and is rotatably supported by a screw blade frame 1101. The shaft 110 is installed from the left and right ends of the screw blade frame 1101.
3 is provided so as to project upward, and this shaft 1103 includes a power transmission mechanism 1109 including a gear 1105 and a connecting shaft 1107.
The geared motor 1111 is connected to the geared motor 1111 via the. Further, the guide rods 1113 projecting upward from the left and right side portions of the screw blade frame 1101 are slidably coupled to the main frame 7 side in the vertical direction.
The steady rest of 101 is made.

The screw blade 11 is composed of a left screw blade 11A and a right screw blade 11B, which are separated at the center in the vehicle width direction. Each screw blade 11A,
As shown in a front view of the right screw blade 11B portion in FIG. 5 and a side view in FIG. 6, 11B includes a rotating shaft 1117 rotatably supported by a bearing 1115 and a rotating shaft 1117.
And a curved guide plate 1121 is arranged at the rear of each screw blade 11A, 11B.

The rotation driving means 13 is a screw blade 1
1 is provided at the center in the longitudinal direction, and as shown in the half sectional front view in FIG. 7 and the side view in FIG.
301, each geared motor 1301, and each rotating shaft 11
A chain sprocket mechanism 1303 for connecting 17 and
A case 1305 for accommodating the chain sprocket mechanism 1303 and the like is provided, and the left and right screw blades 11A and the right and left screw blades 11B and 11B are individually rotated by the rotation driving means 13. A concrete leveling plate 1307 is provided at the front end of the case 1305.

The first and second irons 15 and 17 are shown in FIG.
As shown in FIG. 5, a connecting plate 25 that supports the first and second trowels 15 and 17 by being supported by the trowel frame 21 disposed below the rear portion of the main frame 7 via the anti-vibration rubber 23.
A shaker 27 is mounted on. A shaft 2101 is projected upward from both left and right ends of the iron frame 21, and the shaft 2101 is connected to a geared motor 2109 via a power transmission mechanism 2107 including a gear 2103 and a connecting shaft 2105, as shown in FIG. The geared motor 2109 is connected and the height thereof is adjusted. Further, the guide rods 2111 projecting upward from the left and right side portions of the iron frame 21 are slidably coupled to the main frame 7 side in the vertical direction to prevent the iron frame 21 from swinging. The first trowel 15 extends in the vehicle width direction and includes a horizontal plate portion 1501 that is horizontally formed and has a predetermined width, and a front edge 1503 that is bent obliquely upward from the front end of the horizontal plate portion 1501.
The second trowel 17 extends in the vehicle width direction behind the first trowel 15, has a rectangular cross section, and includes a horizontal plate portion 1701 formed horizontally with a predetermined width.

A work table 31 is provided at the rear end of the main frame 7 so that a worker can board the work, and the work of the concrete leveling machine 1 is controlled while the work board 31 is seated by the worker. An operation panel 33 is arranged on the rear portion of the main frame 7 so that the operation can be performed.

Next, concrete leveling work performed while the leveling machine 1 is running on the rails 65 will be described. In FIG. 10 (A), reference numeral 41 indicates a face, and 43 indicates invert concrete which has already been cast and finished, and for convenience of explanation, a case where an invert concrete portion adjacent to this invert concrete 43 is constructed will be described. In FIG. 10 (A), S indicates a partition plate, and this partition plate S is about 8 mm for edge cutting for crack prevention.
It is provided at a pitch of m to 10 m. First, the tunnel 51
Concrete is poured into the bottom part. For example, as shown in FIG. 10 (B), the concrete is discharged by pulling the screw cleat 47 by the battery locomotive 45 and discharging the concrete from the pressure pipe 49 to the bottom part of the tunnel 51. It is done by going.

Next, the leveling machine 1 is run on the cast concrete. When traveling the leveling machine 1, the screw blades 11
The height of the first and second irons 15 and 17 is set to a predetermined height in advance. Further, the screw blades 11 are rotationally driven, for example, the left screw blades 11A and the right screw blades 11B are rotationally driven so as to scrape excess concrete outward in the left and right directions, and the vibrator 27 is driven. The traveling of the leveling machine 1 is performed by rotating the wheel body 903 by the motor 9, the traveling speed is appropriately adjusted by the operation of the operation panel 33, and the leveling machine 1 is reciprocated as necessary to perform leveling. Repeat the leveling work of concrete by machine 1.

As the leveling machine 1 travels, first, the roughening is performed by the screw blades 11 so that the irregularities on the concrete surface become flat. Next, the first iron 15 vibrated by the vibrator 27 on the roughened concrete surface.
Through which the second iron 17 vibrated by the vibration exciter 27 passes over the concrete surface roughened in this way, and the second iron 17
The finishing smoothing is performed by.

According to this embodiment, the leveling machine 1 is run,
Screw blade 11, first and second irons 15, 17,
The shaker 27 is used to roughly invert the concrete,
The finish smoothing was performed mechanically. The rail 65 on which the leveling machine 1 travels is installed by the anchor bolts 57, and the anchor bolts 57 are embedded with high accuracy, so the rail 65 is also laid with high accuracy.
Therefore, according to the present embodiment, it is needless to say that the leveling work can be performed by one person, and the leveling work for accurately adjusting the height of the rail 65 is not required, and the leveling work is simple and inexpensive. It is possible to maintain high accuracy. Further, since the rail 65 is laid not on the lower surface of the tunnel 51 but on the lower portion of both side walls 6301, the screw blade 11 and the first and second trowels 15 and 17 can be moved between these rails 65. This is advantageous for leveling invert concrete.

Since the screw blade 11 can be driven individually by the left screw blade 11A and the right screw blade 11B, not only the forward and reverse rotation of the screw blade 11 but also only one screw blade 11A or 11B can be performed. It can be driven, and various operations can be performed according to the demand on site. Further, in the embodiment, since the vibrator 27 vibrates the first and second trowels 15 and 17, it is more advantageous in improving the accuracy of the leveling work by the trowels 15 and 17. Further, a screw blade frame 1101 for supporting the screw blades 11, and the first and second
Since the iron frame 21 for supporting the trowels 15 and 17 is connected to the main frame 7 so as to be vertically movable, the leveling machine 1 can be carried in and out in the tunnel 51 by raising the frames 1101 and 21. Easy to do again,
By lowering the frames 1101 and 21 and raising the wheels 903, it is possible to easily attach and detach the rail 65.

In the embodiment, the worker rides on the workbench 31 to control the leveling machine 1. However, the leveling machine 1 may be controlled remotely.

[0022]

As described above, according to the present invention, when leveling the concrete put in the bottom part of the tunnel, the tunnel is formed at the bottom of both sides of the secondary lining formwork installed at the time of the secondary lining. A number of anchor bolts are attached at intervals in the longitudinal direction of the tunnel, the secondary lining formwork is removed after the secondary lining, and the anchor bolts remaining on the lower sides of both sides of the secondary lining surface cause the tunnel longitudinal direction. Since the rails are laid along the rails and the body frame is run along the rails, the concrete leveling means supported by the body frames is used to level the concrete, so that the efficiency of the concrete leveling work can be improved. Therefore, it is possible to easily and inexpensively maintain the leveling accuracy with high accuracy.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of secondary lining of a tunnel.

FIG. 2 is a plan view of the concrete leveling machine.

FIG. 3 is a front view of a concrete leveling machine.

FIG. 4 is a side view of the concrete leveling machine.

FIG. 5 is a front view of a substantially right half portion of a screw blade.

FIG. 6 is a side view of a screw blade portion.

FIG. 7 is a front view of a half section of the rotation driving means.

FIG. 8 is a side view of the rotation driving means.

FIG. 9 is a side view of first and second iron parts.

10 (A) and 10 (B) are explanatory views of concrete placing work and leveling work.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete leveling machine 7 Main frame 9 Travel drive means 11 Screw blades 13 Rotation drive means 15 1st iron 17 2nd iron 27 Vibrator 51 Tunnel 53 Primary lining surface 55 Secondary lining formwork 57 Anchor bolt 63 Secondary lining surface

Claims (6)

[Claims] 1. When leveling concrete put into the bottom of a tunnel, anchor bolts are provided at lower portions on both sides of a secondary lining formwork installed at the time of secondary lining at intervals in the longitudinal direction of the tunnel. After mounting a large number of them, remove the secondary lining formwork after the secondary lining and lay rails along the longitudinal direction of the tunnel with the anchor bolts remaining on both lower parts of the secondary lining surface, A method for leveling concrete at the bottom of a tunnel, characterized in that concrete is leveled by concrete leveling means supported by the vehicle frame while the vehicle body frame is running along. 2. The method for leveling concrete at the bottom of a tunnel according to claim 1, wherein the rails are laid on both lower sides of the secondary lining surface. 3. The method for leveling concrete at the bottom of a tunnel according to claim 1, wherein the rail is provided with a support piece for supporting the rail, and the support piece is fastened to the anchor bolt. 4. The concrete leveling means is provided at the front end of the vehicle body frame so as to extend in the width direction of the tunnel, and includes screw blades for leveling the concrete in the width direction of the tunnel by rotating. 2. A method for leveling concrete at the bottom of a tunnel according to 2 or 3. 5. The concrete at the bottom of the tunnel according to claim 4, wherein the concrete leveling means includes a trowel for concrete leveling, which is supported at a vehicle body frame position behind the screw blades and extends in the width direction of the tunnel. How to level. 6. The method for leveling concrete at the bottom of a tunnel according to claim 5, wherein a vibrator is connected to the iron.