JP3727090B2 - Forming device for reverse winding lining of shaft - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a formwork for a reverse winding method in which lining is sequentially performed from the upper part to the lower part of a shaft according to excavation of the shaft.
[0002]
[Prior art]
A movable formwork device used for the reverse-winding lining of a shaft is, for example, a cylinder-shaped formwork divided into four panels with an arc-shaped cross section and hydraulically applied to a central member suspended at the center of the shaft. These and panels are supported via jacks.
[0003]
When carrying the formwork device into or out of the shaft, the panel is retracted by contracting the hydraulic jack. Further, when used as a mold, all the hydraulic jacks are extended and supported at an advanced position so that the panel forms a cylindrical shape.
[0004]
The lining is constructed every time a certain depth of excavation is completed. Therefore, the formwork apparatus is also carried into the shaft every time and installed at a predetermined position. Then, concrete is cast using the panel supported in a cylindrical shape as an inner mold, and when the concrete is hardened to some extent, the panel is retracted and the mold apparatus is carried out of the shaft, and excavation work is performed again.
[0005]
[Problems to be solved by the invention]
As described above, in the reverse winding method, the installation / removal of the formwork device is repeated, and therefore, the ease of installation / removal greatly affects the work efficiency of the formwork device. However, in the case of this device, since the panel is driven by a hydraulic jack, it is necessary to provide a hydraulic supply device outside the mine and connect it with the hydraulic jack on the premises, and the configuration of the device is complicated. There was a problem that it took time to install and remove the device.
[0006]
The present invention has been made to solve the above problems, and an object thereof is to provide a mold apparatus that is lightweight and easy to install and remove.
[0007]
[Means for Solving the Problems]
The invention of claim 1 is a panel comprising a central member suspended inside a shaft and a plurality of panels having a circular arc section divided by a cylinder and supported by the central member, the panels constituting a cylindrical formwork In the reverse roll lining formwork apparatus supported by the central member so that the panel can be moved between the advanced position of the shaft and the retracted position where at least a part of the panel approaches the central member, the panel can be bent and stretched Means are provided for connecting to the central member via an arm and locking the arm in the extended position. The invention of claim 2 is the invention of claim 1, wherein the cylinder is composed of four substantially divided panels, and the two opposite panels are retracted, and then the remaining two panels are retracted. This displaces the panel from the forward position to the backward position.
[0008]
The invention of claim 3 is the invention of claim 1 or 2, wherein the arm is configured such that the bending and stretching of the arm is performed on a substantially vertical plane, and the refraction point is displaced upward by the refraction of the arm. The arm is bent by lifting the wire locked in the vicinity of the arm.
[0009]
The invention of claim 4 includes a central member suspended inside the shaft and a plurality of panels having a circular arc section divided by a cylinder supported by the central member, wherein the panels constitute a cylindrical formwork. In the reverse roll wrapping formwork apparatus supported by the central member so that the panel can be moved between the advanced position of the panel and the retracted position where at least a part of the panel approaches the central member, the central member is horizontally sectioned. It is formed in a substantially square shape , and the arm is attached to each vertex of the square via a hinge so as to freely swing in the horizontal direction, while the cylinder is composed of four panels, and the back surface of each panel is substantially linear in the horizontal direction. An extending guide is provided, and a roller rotatably supported at the tip of each arm is engaged with each panel so as to roll freely along this guide.
[0010]
According to a fifth aspect of the present invention, in the fourth aspect of the invention, a wing that is refracted toward the inside of the cylinder is provided at an end of the panel that comes into contact with the other two opposite panels.
[0011]
[Action]
In the invention of claim 1, the panel reduced in weight by the division is easily displaced between the forward movement position and the backward movement position by the bending operation of the arm. The lock means holds the arm in the extended position and supports the panel in the advanced position, thereby causing the panel to function as a mold. On the other hand, the panel retracted by the refraction of the arm makes it easy to carry the apparatus into and out of the shaft.
[0012]
The invention of claim 2 prevents the interference between the panels at the time of retraction by first retracting the two opposite panels of the four panels and then retracting the remaining two panels. .
[0013]
In the invention of claim 3, the wire lifts the arm in the vicinity of the refracting portion to refract the arm and retract the panel. Furthermore, the panel is held in the retracted position by maintaining the tension of the wire.
[0014]
In the invention of claim 4, the arm moves the roller along the guide and guides the panel in the horizontal direction, so that the retreat position of the panel where the square side of the central member and the guide approach each other, and the panel The panel is smoothly displaced between the forward positions constituting the cylinder.
[0015]
The invention of claim 5 facilitates the movement of the panel by refracting the wings provided at both ends of the two opposing panels.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the present invention will be described with reference to FIGS.
[0017]
As shown in Fig. 1, the formwork apparatus has four arcuate cross-section panels 1 obtained by dividing a cylindrical formwork into approximately equal parts. These panels 1 are supported via an arm 3 that bends and extends to a central member 2 provided at the center. The central member 2 is a member having a rectangular cross section, and is provided with four columns 5 as shown in FIG. At the lower end of each column 5 is provided a leg 6 that contacts the ground. At the upper end of each column 5, a wire locking portion 5 </ b> A for lifting the central member by a crane is provided.
[0018]
Arm 3 is provided for each panel 1 in two upper and lower rows. Each arm 3 is divided into members 8 and 9 by a hinge 7 provided at an intermediate portion. The end of the member 8 is hinged to the inner periphery of the panel 1. The end of member 9 is hinged to center member 2. The member 8 includes an extension portion 8A that protrudes beyond the hinge 7, and a pin hole 10 is formed in the extension portion 8A. On the other hand, a pin hole 12 that is coaxial with the pin hole 10 when the arm 3 is extended is formed in the member 9. By inserting a lock pin 4 as a locking means into these pin holes 10 and 12, the arm 3 is held in an extended state.
[0019]
The member 8 is also provided with a push-down portion 13 for applying a push-down force to the hinge 7. A sub arm 14 is connected to the hinge 7. A wire 15 is connected to the sub arm 14. This wire 15 is connected to an upper crane through a pulley 16 attached to the upper part of the center member 2 together with a wire locked to the locking portion 5A.
[0020]
Panel 1 has a fresh concrete inlet not shown.
[0021]
As shown in FIG. 2, this formwork apparatus is carried into the shaft with the panel held in the retracted position, and is carried out from the shaft. This loading / unloading is performed by lifting the wire locked to the locking portion 5A and the wire 15 locked to the sub arm 14 and passing through the pulley 16 with a crane (not shown). At this time, each arm 3 is held in a bent state by the tension of the wire 15, and each panel 1 is held in a retracted position.
[0022]
In the reverse winding method in which the lining is performed in order from the upper part to the lower part of the vertical shaft, the carry-in of the formwork device to the vertical shaft and the removal from the vertical shaft are performed through the inside of the already completed construction. In that case, since the outer diameter of the formwork apparatus holding the panel 1 in the retracted position is sufficiently small, it can be carried in and out smoothly without interfering with the existing lining.
[0023]
When installing the formwork, the formwork device is carried into the shaft by the above method, and when the leg 6 comes in contact with the ground at the bottom of the shaft, the wire tension is released. Then, the worker pushes down the push-down portion 13 of the arm 3. As a result, the arm 3 is extended, and the panel 1 is displaced to the advanced position. Panel 1 is divided and light in weight and easily displaced by manual operation.
[0024]
As the arm 3 extends, the pin holes 10 and 12 become coaxial, and the lock pin 4 is inserted into them. As a result, the refraction of the arm 3 is prevented and the panel 1 is supported in the advanced position. The extension operation of the arm 3 is first performed on the outer panel 1, that is, the left and right panels 1 in FIG. 2, and after these are supported in the advanced position shown in FIG. 1, the inner panel 1, that is, the upper and lower panels in FIG. Repeat for Panel 1.
[0025]
Thus, by supporting all the four panels 1 in the advanced position, a cylindrical formwork is formed as shown in FIG. Concrete placement is performed by putting ready-mixed concrete into the outside of panel 1 from the slot provided in panel 1. At this time, the pressure of ready-mixed concrete acts on the panel 1 toward the center of the cylinder, but the arm 3 held in a straight state by the lock pin 4 holds the panel 1 in the advanced position against this load. .
[0026]
On the other hand, the formwork device is removed when the cast concrete has hardened to a certain level.
[0027]
In this case, after pulling out the lock pin 4 from the pin holes 10 and 12 of each arm 3, the wire 15 is first pulled up only for the upper and lower panels 1 in FIG. As a result, the hinge 7 is pulled up via the sub arm 14, the arm 3 is refracted, and the panel 1 is retracted. When these panels 1 are sufficiently retracted, the same operation is performed on the left and right panels 1 in FIG. 1 to retract all panels 1 to the positions in FIG.
[0028]
Thereafter, the wire locked to the locking portion 5A is pulled up. At this time, by continuously holding the tension of each wire 16, each panel 1 is pulled up from the shaft together with the central member 2 while being held in the retracted position. The raised formwork device may be placed in a place where it does not interfere with other operations until it is used again.
[0029]
In this way, the work inside the shaft uses only human power and the lifting force of the crane that lifts the device, and no other power is used, so no power supply equipment is required, and installation and removal of the device is efficient in a short time Can be done well.
[0030]
Next, a second embodiment of the present invention will be described with reference to FIGS.
[0031]
The formwork apparatus shown in FIG. 4 includes two opposing panels 20A, two other panels 20B having slightly different structures, and a central member 2 having a square horizontal cross section located at the shaft center.
[0032]
The surface of the panels 20A and 20B facing the natural ground has an arcuate horizontal section obtained by dividing the cylindrical shape, like the panel 1 of the first embodiment. Panel 20A has a longer arc than panel 20B.
[0033]
A guide 23 extending linearly in the horizontal direction is formed on the back surface of the panels 20A and 20b facing the central member 2. As shown in FIG. 4D, the guide 23 of the panel 20B has the same width as one side of the square cross section of the central member 2, and the width of the guide 23 of the panel 20A is longer than this.
[0034]
Arms 21 are attached to the four corners of the central member 2 via hinges 24 so as to freely pivot in the horizontal direction, and a roller 22 is supported at the tip of the arm 21.
[0035]
The rollers 22 engage with the guides 23 of the panel 20 so as to roll freely. For this purpose, the roller 22 is supported at a position offset upward or downward with respect to the arm 21 via the rotating shaft 22A and rolls along the guide 23 but does not come off the panel 20A or 20B. .
[0036]
Figure 4 (A) shows the assembled formwork device. In this state, four panels form a cylindrical shape. Although not shown in the figure, the four panels are supported in a cylindrical state by joining adjacent panels in this state.
[0037]
After a predetermined time has passed after placing the concrete, as shown in Fig. 4 (B), the panel 20B is moved horizontally counterclockwise with respect to the shaft center. At this time, since the roller 22 rolls along the guide 23 of the panel 20B , the panel 20B moves with a small force.
[0038]
As shown in FIG. 4C, when the roller 22 reaches one end of the guide 23 and the guide 23 of the panel 20B approaches the center member 2, the remaining panel 20A is similarly moved counterclockwise.
[0039]
As a result, as shown in Fig. 4 (D), the formwork device is put together in a form where the guides 23 of the panels 20A and 20B are in contact with the square sides of the central member 2, and in this state, the crane is placed outside the shaft. It is carried out to.
[0040]
In service, contrary to the above order, from the state of FIG. 4 (D), the panel 20A is first moved, and then the panel 20B is moved horizontally in the clockwise direction to reach the state of FIG. 4 (A).
[0041]
FIG. 5 shows another example of the second embodiment. Here, wings 25 that can be refracted inwardly are attached to both ends of each panel 20A via hinges.
[0042]
Fig. 5 (A) shows the assembled state as a mold as in Fig. 4 (A). In this embodiment, when the mold is folded, as shown in FIG. 5 (B), first, each wing 25 is bent inward. Other operations are almost the same as in the first embodiment, but the wing 25 can be bent at an arbitrary angle so that the panel 20A does not interfere with the movement of the panel 20B. Operation becomes easier.
[0043]
【The invention's effect】
The present invention includes means for displacing the divided panel by bending and stretching the arm and locking the arm in the extended position, so that the panel can be moved forward and backward by human power, and the arm is locked in the extended position. Thus, sufficient supporting force as a panel formwork can be obtained. For this reason, the configuration of the formwork apparatus is simplified, and the installation and removal of the apparatus can be performed only by the lifting force and the human power of the crane without using hydraulic pressure or the like.
[0044]
In addition, it is possible to prevent interference between the panels in the backward movement by using four panels and sequentially moving the two opposite panels backward.
[0045]
Furthermore, since the arm is refracted by lifting the wire locked in the vicinity of the bending portion of the arm, the panel can be retracted without using human power, and the panel can be held in the retracted position by the lifting force.
[0046]
Alternatively, a guide extending substantially linearly in the horizontal direction is provided on the back surface of each panel, and a roller at the tip of an arm hinged to each vertex of the center member is allowed to freely engage with each panel along this guide. Therefore, the panel can be smoothly moved between the forward movement position and the backward movement position while the arm rolls the roller along the guide.
[0047]
In addition, since refracting wings are provided at both ends of the two opposing panels, the panels can be moved more easily by folding the wings.
[0048]
Therefore, according to the present invention, the work efficiency of installing and removing the formwork when performing reverse winding lining on the shaft is improved.
[Brief description of the drawings]
FIG. 1 is a schematic horizontal cross-sectional view of a formwork device according to a first embodiment of the present invention at an advanced position.
FIG. 2 is a schematic horizontal sectional view of the mold apparatus at a retracted position.
FIG. 3 is an enlarged view of the AA arrow diagram in FIG.
FIG. 4 is a schematic horizontal cross-sectional view of a mold apparatus, which sequentially shows the operation of the mold apparatus according to an example relating to the second embodiment of the present invention.
FIG. 5 is a schematic horizontal cross-sectional view of a formwork apparatus, which sequentially shows the operation of the formwork apparatus according to another example relating to the second embodiment of the present invention.
[Explanation of symbols]
1, 20A, 20B Panel
2 Center member
3, 21 arms
4 Lock pin
7, 24 Hinge
15 wire
22 Laura
23 Guide
25 Wing

Claims (5)

A center member provided with a leg portion that abuts a natural ground in a shaft, and a plurality of panels having a circular arc section divided by a cylinder supported by the center member, the panels constituting a cylindrical formwork In the form device for the reverse winding lining of the shaft supported by the center member so that the panel can be moved between the advance position of the panel and the retracted position where at least a part of the panel approaches the center member,
The panel is connected to the central member via an arm that can bend and stretch, and includes a locking means that locks the arm in the extended position.
The arm is composed of two members divided by a hinge, and the hinge portion is provided with the locking means .   The cylinder is composed of four substantially equally divided panels, and after the two opposing panels are retracted, the remaining two panels are retracted to displace the panel from the advance position to the retract position. Item 2. The shaft device for reverse winding lining of a shaft according to item 1.   The arm is configured so that the arm is bent and stretched on a substantially vertical plane, and the refraction point is displaced upward by the refraction of the arm, and the arm is refracted by lifting the wire locked in the vicinity of the refracting portion. The form device for reverse winding lining of a shaft according to claim 1 or 2.   A central member suspended inside the shaft, and a plurality of panels having an arc-shaped cross-section obtained by dividing the cylinder and supported by the central member, wherein the panel constitutes a cylindrical formwork and at least the panel In the reverse roll lining formwork apparatus of the shaft that is supported by the central member so that the panel can be moved between a retreat position where a part of the central member is close to the central member, the central member is formed in a substantially rectangular shape in a horizontal section. The arm is attached to each apex of the arm via a hinge so as to freely swing in the horizontal direction, while the cylinder is composed of four panels, and a guide extending substantially linearly in the horizontal direction is provided on the back surface of each panel. A shaft device for reverse winding lining of a shaft, wherein a roller supported at the tip of the shaft is freely engaged with each panel along the guide.   5. The formwork device for a reverse winding lining of a shaft according to claim 4, further comprising a wing that is refracted toward the inside of the cylinder at an end of the panel that comes into contact with the other two opposing panels. .

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