JPH09310589A - Method and equipment for moving form - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the efficiency of the movement of forms, to shorten the term of works and to reduce construction cost. SOLUTION: When a form device 20 is moved forward, a pair of two rails 50, 50 are laid on an executing base G in front by a rail hanger 52 installed at the front end section of a form support beam 22 while a pair of two transfer trucks 45, 46 are mounted at the front and the rear of the form support beam 22. The form support beam 22 is shifted forward by making these transfer tracks 45, 46 travel along the upper sections of the rails 50, 50, the diameter of a form unit 21 is shrunk, the form unit 21 is moved forward along the form support beam 22 by a drive mechanism (not shown), and the diameter of the form unit 21 is expanded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of moving a formwork and a formwork suitable for use in moving a formwork for constructing an underground structure such as an underground canal or a tunnel forward in the construction direction. Mobile device of the present invention.

[0002]

2. Description of the Related Art Among underground structures such as underground conduits and tunnels, as a method of constructing an underground structure that is provided at a relatively shallow position below the ground surface, the ground is dug down from the ground surface The so-called open-cut construction method of filling the ground after forming the structure on the bottom is most commonly used. In this method, in order to form an underground structure at the bottom of a groove, a formwork for forming the inner peripheral surface of the underground structure is assembled over a certain length in the continuous direction of the structure, and concrete is formed. After casting, the mold is dismantled after it has hardened. After this, the formwork is rearranged forward in the construction direction of the underground structure, and assembling and disassembling the formwork is repeated in the same manner as above to form the underground structure over a predetermined length. There is. However, in such a construction method, the assembling and disassembling work of the formwork are both performed manually at the site, so the workability is poor, which hinders the reduction of the construction period and the reduction of the construction cost.

As one of means for solving such a problem, there is a construction method using a needle beam type steel frame. This method is used in the formwork apparatus 1 as shown in FIG.
Is used. The formwork apparatus 1 is roughly composed of a cylindrical formwork body 2 and a formwork support beam 3 arranged in parallel with the axis of the formwork body 2. As shown in FIG. 9, the formwork main body 2 is divided into a plurality of units in the circumferential direction, and includes a bottom formwork 2A, side formworks 2B and 2B, and an upper formwork 2C. Of these, the upper frame 2C is further divided into two parts, and both ends thereof can be folded inward. Then, in the mold body 2, the upper mold 2C is folded to form the bottom mold 2A and the side mold 2
By drawing B and 2B inward in the cross-sectional direction, the diameter can be reduced as a whole. The form supporting beam 3 shown in FIG. 8 is provided with a drive mechanism (not shown) for moving the form main body 2 forward and backward along the direction in which the form supporting beam 3 continues.

In order to form the underground structure 4 by using such a formwork device 1, first, the reinforcing bars constituting the underground structure 4 are first assembled on the front side in the construction direction of the formwork device 1. .
Then, the diameter of the mold body 2 is reduced, the mold body 2 is advanced along the mold support beam 3 to move inwardly of the pre-assembled rebar, and then the diameter of the mold body 2 is expanded. Then, concrete C is cast on the outer peripheral side of the mold 2 and is hardened, whereby the underground structure 4 in this section is formed. After that, in the same manner as described above, the underground structure 4 is extendedly constructed by repeating the front assembly of the reinforcing bars, the advance of the formwork device 1, and the placing and curing of concrete C. .

In advancing the formwork apparatus 1, first of all,
After advancing only the formwork support beam 3 by operating a drive mechanism (not shown), the legs 5 and 6 provided in front of and behind the formwork support beam 3 are installed on the front construction bottom surface G and the rear underground structure. 4 is made to stand on the bottom part 4a. Then, after the diameter of the mold body 2 is reduced, the mold body 2 is advanced by a drive mechanism (not shown) along the mold support beam 3, and then the diameter of the mold body 2 is expanded. ing. In addition, when advancing the mold support beam 3 in a state where the casting and curing of the concrete C around the form main body 2 is completed, the form formed around the form main body 2 is expanded. A reaction force is obtained from the intermediate structure 4 to move the form supporting beam 3 forward. On the other hand, placing concrete C around the form body 2
When the form supporting beam 3 is advanced while the curing is not completed, as shown in FIG.
The pedestal 7 having a shape conforming to the outer shape of the above is installed on the construction bottom surface G, and the formwork main body 2 is temporarily received on the pedestal 7.

[0006]

However, the conventional method of moving a mold as described above has the following problems. First, concrete C around the formwork body 2
When the formwork support beam 3 is advanced with the casting and curing of the formwork completed, the advancement work of the formwork device 1 can be performed only after the hardening of the concrete C is completed, so that the construction period can be shortened. It was an obstacle, and this also hindered the reduction of construction costs. In addition, concrete C around the formwork body 2
When the form support beam 3 is advanced using the cradle 7 in a state in which the casting and curing of No. 1 have not been completed, the construction period can be shortened compared to the above, but Not only is it costly because the stand 7 must be prepared separately, but also the receiving stand 7 has to be rearranged in order forward, and there is still room for shortening the construction period and reducing the construction cost. The present invention has been made in consideration of the above points, and provides a mold moving method and a mold moving device capable of improving the efficiency of mold movement, shortening the construction period, and reducing the construction cost. The challenge is to provide.

[0007]

The invention according to claim 1 is
A formwork for forming the inner wall of a tubular underground structure made of reinforced concrete that is continuous in one direction, part of its circumferential direction can be folded inward, and the other part can be reduced in diameter A mold main body having a structure, a mold support beam disposed inside the mold main body and movably supporting the mold main body in the axial direction thereof, and along the mold support beam A pair of two rails that are configured by a drive mechanism that moves the mold body, and that, when the mold is conveyed forward in the construction direction, extend on the construction bottom surface in the front along the movement direction of the mold. After laying, and attaching a pair of two moving carriages before and after the form supporting beam, and moving these moving carriages along the rails to move the form supporting beam forward. , The diameter of the mold body is reduced, and the mold support is performed by the drive mechanism. It is characterized in that the diameter increases after moving forward along the beam.

According to a second aspect of the present invention, in the method for moving the formwork according to the first aspect, a rail suspending member for suspending the rail is provided in front of the formwork supporting beam, and the rail is provided. It is characterized in that the rail is laid on the construction bottom surface using a suspending member.

The invention according to claim 3 is arranged so as to extend along the axis of the form body which forms the inner wall of the reinforced concrete tubular underground structure continuous in one direction. The moving device for moving the mold support beam forward in the construction direction is composed of a pair of two movable carriages attached to the front and rear of the form support beam. It is characterized by comprising a pair of two wheels arranged in a row.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An example of an embodiment of a method for moving a mold and a device for moving a mold according to the present invention will be described below with reference to FIGS. 1 to 7. As shown in FIG. 1, a formwork device (formwork) 20 is a tubular formwork unit (formwork body) corresponding to a sectional shape of an inner surface of a tunnel (underground structure) T to be formed, that is, a circle. 21 and the formwork unit 21
And a form support beam (form support beam) 22 extending along the axial direction of.

The mold frame unit 21 is composed of a plurality of ring molds 21a, for example, seven ring-shaped molds 21a, which are separably connected in the axial direction. As shown in FIG. 2, the mold unit 21 is also divided into four in the circumferential direction into a bottom (invert) mold 23, side molds 24 and 25, and an upper mold 26. The frame unit 21 has a substantially square-shaped frame 27 at its center.
The bottom mold 23, the side molds 24 and 25, and the upper mold 26 are supported on the frame 27 in the following manner.

As shown in FIG. 3, the bottom frame 23 is divided into two in the circumferential direction, and can be folded inward by hinges provided at both ends. The two bottom molds 23 are opened and closed by the bottom hydraulic cylinders 28, 28.

The side molds 24 and 25 and the upper mold 26 are drawn inward by the side hydraulic cylinders 29 and 29 in a substantially horseshoe-shaped state, and their outer diameters in the cross-sectional direction are reduced. It can be reduced.

As shown in FIG. 1, such a formwork unit 21 has a concrete injection port 33,
33, ... Are formed and each concrete injection port 33 is formed.
A concrete injection pipe 34 is connected to the. As a result, concrete is injected from the concrete injection pipe 34 to the outer peripheral side of the form unit 21 through the concrete injection port 33. In addition, the formwork unit 2
The front end peripheral portion of No. 1 is provided with a gable plate 35 that closes the gap between the form unit 21 and the surrounding ground over the entire circumference.

As shown in FIG. 2, the formwork support beam 22
Is formed of a three-dimensional truss structure having a rectangular cross section, and is arranged on the central axis of the mold frame unit 21. The frame support beam 22 supports a frame 27 slidably above and below the frame 27 in the axial direction of the frame unit 21. As a result, the mold frame unit 21 and the mold frame support beam 22 are movable back and forth in the axial direction. The formwork support beam 22 is provided with a drive mechanism (not shown) for driving the formwork support beam 22 to move back and forth with respect to the formwork unit 21.

Further, as shown in FIG. 1, the form supporting beam 22 has a leg 4 which can extend and retract in the front and rear direction.
0 and 41, and these legs 40 and 41 stand on the construction bottom surface G or the bottom surface T1 of the tunnel T.

As shown in FIG. 4, this form supporting beam 2
The front and rear portions of the vehicle 2 are detachably provided with a pair of two movable carriages (moving devices) 45 and 46. FIG.
As shown in FIG. 5, each of the movable carriages 45 and 46 has a pair of legs 47 and 47 that are spaced apart by a predetermined distance in the cross-sectional direction of the form support beam 22. As shown in FIG. 6, each leg 47 has a pair of wheels 48, 2 in the axial direction of the form support beam 22.
A rotary shaft 48 is rotatably supported. In addition, as shown in FIG.
A self-propelled device 49 for rotating and driving 8, 8 is provided, which allows the movable carriage 45 to be self-propelled. The movable carriages 45 and 46 are detachably fixed to the lower surface of the formwork supporting beam 22 at predetermined positions with bolts or the like, and when the formwork supporting beam 22 moves, the moving carriages 45 and 46 are placed on the construction bottom surface G along the moving direction. It is possible to travel on a pair of traveling rails (rails) 50, 50 laid on the.

At the front end of the form supporting beam 22,
The running rails 50, 50 are installed on the construction bottom surface G in front of the construction direction.
A rail suspension device (rail suspension member) 52 for sequentially laying the rails is provided. As shown in FIG. 7, the rail suspension device 52 includes an electric chain block 53 with an electric trolley and a form supporting beam 22.
And a rail 54 horizontally provided so as to be orthogonal to the axis of the electric chain block 53. The electric chain block 53 is movably provided along the rail 54. Rail 54
Is installed between a pair of two support members 55, 55 extending forward from the front end of the formwork support beam 22, and the electric chain block 53 guides the traveling rails 50, 50 as shown in FIG. It is long enough to be laid.

Next, as shown in FIG. 1, in order to form the tunnel T by using such a formwork device 20, basically, a tunnel excavated by a shield excavator or the like in the same manner as the conventional one. In H, assembling the rebar, advancing the form support beam 22 to the section where the rebar is assembled, advancing along the form support beam 22 of the form unit 21 in a reduced diameter state, expanding the form unit 21. From the diameter concrete injection pipe 34 and the concrete injection port 33, filling the space between the mine H and the formwork unit 21 with the concrete C, after the concrete C exhibits a predetermined strength,
After the diameter of the mold unit 21 is reduced, the tunnel T having a predetermined length is formed by repeating the above steps.

Here, in advancing the form supporting beam 22, the work is performed as follows. First, in a state in which the above-mentioned reinforcing bars have been assembled, when concrete C has already been cast and cured around the form unit 21, the form unit 21 is left in the expanded state. And after contracting the legs 40 and 41,
A reaction force is applied to the surrounding hardened concrete C, that is, the tunnel T, and the form supporting beam 22 is advanced by a driving mechanism (not shown). Then, after the formwork support beam 22 is advanced by a predetermined distance, the legs 40 and 41 are extended and made to stand on the construction bottom surface G or the bottom surface T1 of the tunnel T.

Further, when concrete C is not placed around the form unit 21 in the state where the above-mentioned rebar assembly is completed, the following is performed. First, as shown in FIG. 4, the belt conveyor 56 (see FIG. 1) provided on the form supporting beam 22 conveys the traveling rails 50, 50 to the front side, and the rail suspension device 52 performs the front construction. It is hung and laid on the bottom surface G. At this time, the electric chain block 53 shown in FIG. 7 is moved left and right along the rail 54 so that the traveling rails 50, 50 are set at predetermined positions. Subsequently, the movable carriages 45 and 46 are attached before and after the formwork support beam 22. At this time, it goes without saying that the movable carriages 45 and 46 are placed on the traveling rails 50 and 50. Then, after retracting the legs 40 and 41, the self-propelled device 49 provided on one of the movable carriages 45.
By moving the movable carriage 45 forward in the construction direction, the form supporting beam 22 is advanced along the traveling rails 50. After this, travel rails 50, 5
The laying work of 0 and the advancement of the form support beam 22 are repeated to advance the form support beam 22 by a predetermined distance, and after the advancement is completed, the legs 40 and 41 are extended to stand.

In the method of moving the formwork apparatus 20 described above, a pair of rails 5 are provided on the front construction bottom surface G by the rail suspending device 52 provided at the front end of the formwork support beam 22.
0 and 50 are laid, and two pairs of moving carriages 45 and 46 are attached to the front and rear of the form supporting beam 22. Then, by moving the movable carriages 45 and 46 along the rails 50 and 50 to move the formwork support beam 22 forward, the formwork unit 21 is reduced in diameter to drive it. None), the mold unit 21 is moved forward along the form supporting beam 22, and then the form unit 21 is expanded in diameter. Further, for use in such a moving method, the pair of two moving carriages 45 and 46 attached to the front and rear of the form supporting beam 22 respectively move the pair of front and rear wheels 48 and 48 to the left and right. It is configured to be provided for each of the legs 47, 47 of the. In this way, when the formwork apparatus 20 is moved along with the progress of the construction of the tunnel T, the formwork supporting beam 22 is moved forward by the moving carriages 45 and 46 while laying the rails 50 and 50, so that the formwork unit 21 is moved. Even if the concrete C placed around the
The mold support beam 22 can be moved forward while this is being cured, and work efficiency can be improved. Further, it is not necessary to prepare the pedestal 7 (see FIG. 10) as in the conventional case, and sequentially rearrange it. As a result, it is possible to reduce the construction period and the construction cost.

In the above embodiment, the rail 5
For rails 0 and 50, for example, when rails are already installed for other purposes, the moving carriages 45 and 46 that match the gauge of the rails may be used. Further, in this case, it goes without saying that it is not necessary to provide the rail suspension device 52. Further, in the above-mentioned embodiment, the tunnel T having a circular cross-section is given as an example of the underground structure to be constructed, but the same applies to other underground structures other than the tunnel, such as a headrace. Can be applied to. Further, the same configuration can be applied to a shape other than the circular shape in cross section, for example, a rectangular shape.

[0024]

As described above, according to the method for moving a formwork according to the first aspect, the formwork includes a formwork body, a formwork support beam, and a formwork body along the formwork support beam. It is composed of a drive mechanism for moving the mold, and when transporting the formwork forward in the construction direction, a pair of two rails are laid on the front construction bottom and two pairs of movements are made in front of and behind the formwork support beam. After the dolly is attached and the moving dolly is moved along the rails to move the formwork support beam forward, the formwork main body is moved forward along the formwork support beam. Further, according to the method of moving the formwork according to claim 2, a rail suspending member is provided in front of the formwork supporting beam, and the rail is laid on the construction bottom surface using the rail suspending member. It has become a configuration. In this way, when moving the formwork as the construction progresses, the concrete laid around the formwork body is not cured by laying the rails forward and advancing the formwork support beam by the moving carriage. Even in the state, it is possible to advance the formwork supporting beam while curing it, and work efficiency can be improved. In addition, it is not necessary to prepare a cradle and rearrange it forward one by one as in the conventional case. As a result, it is possible to reduce the construction period and the construction cost.

According to the form moving device of the third aspect,
The moving device for moving the form supporting beam forward in the construction direction is composed of a pair of two moving carriages attached to the front and rear of the form supporting beam, and each moving carriage is a pair of two arranged in the front-rear direction. The left and right wheels are provided. This makes it possible to realize the method for moving a mold according to claim 1 or 2, and it is possible to obtain the effects of shortening the construction period and reducing the construction cost.

[Brief description of drawings]

FIG. 1 is a side view showing an example of a mold to which a mold moving method and a mold moving device according to the present invention are applied.

FIG. 2 is a front view of the same formwork.

FIG. 3 is a front sectional view showing a state in which the diameter of the mold is reduced.

FIG. 4 is a side view showing a method for moving the same frame.

FIG. 5 is a front view showing a moving device of the mold.

FIG. 6 is a side view of FIG. 5;

FIG. 7 is a side view showing a suspending device provided in the mold.

FIG. 8 is a side view showing an example of a conventional mold.

FIG. 9 is a front view of the mold.

FIG. 10 is a plan view and a front view showing a pedestal provided in the same frame.

[Explanation of symbols]

 20 Formwork Device (Formwork) 21 Formwork Unit (Formwork Main Body) 22 Formwork Support Beam (Formwork Support Beam) 45, 46 Moving Carriage (Moving Device) 48 Wheels 50 Traveling Rail (Rail) 52 Rail Lifting Device (Rail suspension member) G Construction bottom T Tunnel (Underground structure)

Claims (3)

[Claims] 1. A formwork for forming an inner wall of a tubular underground structure made of reinforced concrete that is continuous in one direction, a circumferential part of which can be folded inward, and the other part of the formwork can be folded. And a mold support beam which is arranged inside the mold body and movably supports the mold body in the axial direction thereof. A drive mechanism for moving the mold body along a support beam. When the mold is conveyed forward in the construction direction, it extends along the movement direction of the mold on the front construction bottom surface. A pair of two rails are laid, and two pairs of movable carriages are attached to the front and rear of the form supporting beam, and these moving carriages are run along the rails to move the form supporting beam forward. After that, the diameter of the mold body is reduced to allow the drive mechanism to Therefore, the method of moving the formwork is characterized in that the formwork is moved forward along the formwork support beam and then the diameter is expanded. 2. The method of moving a formwork according to claim 1, further comprising a rail suspending member for suspending the rail in front of the formwork supporting beam, and using the rail suspending member. A method of moving a formwork, characterized in that the rail is laid on a construction bottom surface. 3. A form supporting beam arranged so as to extend along an axis of a form main body forming an inner wall of a tubular underground structure of reinforced concrete continuous in one direction. The moving device for moving forward in the construction direction is composed of a pair of two moving carriages attached to the front and rear of the form support beam, and each moving carriage has two left and right rows arranged in the front-rear direction. A form moving device, comprising a pair of wheels, respectively.