JP7407222B2 - Shaft slide form and shaft lining method - Google Patents

Description

The present invention relates to a slide form for a shaft and a method for lining a shaft.

When lining a shaft, the conventional method was to assemble inner scaffolding up to the point where the concrete lining was to be constructed, then set up wooden formwork to surround the inner scaffolding, and pour concrete. there were. In addition, there was also a construction method described in Patent Document 1.
The construction method of Patent Document 1 is to erect a shaped steel at the construction position of the lining concrete via rock anchors installed in the excavated rock, and to fix a vertically movable sliding scaffold to the lining plate joined to the shaped steel. Concrete is poured using the board as a formwork board, and after the poured concrete has hardened, the lining board is joined to the form steel added to the form steel, and then the slide scaffolding is moved upward and fixed onto the upper lining board. This is a construction method in which the process of placing the next concrete using this upper lining board as a formwork board is repeated in sequence.

Japanese Patent Application Publication No. 9-316899

In the conventional construction method and the construction method of Patent Document 1, the scaffolding and the formwork are installed separately, so a gap (opening) is created between the scaffolding and the formwork, which prevents flying materials and tools from falling. There was a problem in that it required time and effort to take measures such as protecting the openings and preventing accidents from falling. In addition, in the conventional construction method, the formwork is installed after the scaffolding is assembled, which requires construction work and lengthens the construction time.
From this viewpoint, an object of the present invention is to provide a shaft slide form and a shaft lining method that have good workability and can reduce construction effort and time.

A first aspect of the present invention to solve such problems is a shaft slide form for lining a shaft, which comprises a formwork extending in the circumferential direction of the shaft, and a formwork fixed to the formwork. A formwork scaffolding member having a scaffolding and a scaffolding provided therein is provided. The formwork scaffold member is divided in the circumferential direction and includes a plurality of divided pieces rotatably connected to each other, and a deformable piece provided between the divided pieces , The scaffold is divided in the circumferential direction according to the shapes of the divided pieces and the deformed piece, and the scaffold is divided in the circumferential direction according to the shapes of the plurality of divided pieces, and each of the scaffolds is fixed inside the formwork. The scaffolds that are adjacent to each other in the circumferential direction are arranged at intervals such that they do not interfere with each other when the divided pieces rotate .
According to the slide form for a shaft according to the present invention, since the scaffolding is fixed to the formwork, the gap (opening) between the scaffolding and the formwork can be reduced. On the other hand, when the formwork scaffolding member deforms the deformable piece and rotates the divided piece inside the shaft, the fixed state with the shaft is released. This allows upward movement of the formwork scaffolding members. Furthermore, since the formwork and scaffolding can be raised at the same time, the time required to prepare for pouring concrete on the upper level is shortened, reducing construction effort and time.
In the slide form for a shaft of the present invention, the scaffolding includes reinforcing members that are horizontal members that reinforce the formwork, pillar members that are vertical members that connect the reinforcing members arranged in the vertical direction, and the formwork. It is preferable to have a scaffolding member extending radially inward from the inside of the base.
In the shaft slide form of the present invention, between the pair of divided pieces disposed with the deformed piece in between, there is a divided piece for rotating the pair of divided pieces between an outer peripheral position and an inner position. It is preferable that the rotating means be spanned. According to such a configuration, the divided pieces can be easily rotated by operating the divided piece rotation means.
Moreover, in the shaft slide form of the present invention, it is preferable that the divided piece has a base piece and a pair of rotating pieces connected to both ends of the base piece. According to such a configuration, by rotating the rotating piece while keeping the base piece fixed, it is possible to rotate the divided piece in a stable state.
Furthermore, in the shaft slide form of the present invention, the deformable piece is rotatably connected to the divided piece, and the deformable piece is fixed at a position between the divided piece and the deformed piece. It is preferable that a deformable piece moving means for moving the deformed piece between the deformed piece and the retracted position is spanned therebetween. According to such a configuration, the divided pieces can be rotated by moving the deformed piece to the retracted position. By operating the deformed piece moving means, the deformed piece can be easily moved.

A second aspect of the present invention for solving the above problem is a shaft lining method for lining a shaft using the shaft slide form according to claim 1 . The shaft lining method includes a formwork scaffolding member installation step of installing the formwork scaffolding member at a concrete placement position inside the shaft, and placing concrete between the formwork and the inner surface of the shaft. After the concrete pouring process and the concrete hardening, the deformable piece of the formwork scaffolding member is deformed and the plurality of divided pieces including the formwork and the scaffolding are rotated inwardly to form the form. It is characterized by sequentially repeating a form scaffolding member raising step of shrinking the frame scaffolding member inward and raising it to the next concrete placement height.
According to the method for lining a shaft according to the present invention, a formwork scaffold member in which a scaffold is fixed to a formwork is used, so that the gap (opening) between the scaffold and the formwork can be reduced. On the other hand, by contracting the formwork scaffolding members inward, the fixed state with the shaft is released. This allows the formwork scaffolding member to move upward in the formwork scaffolding member raising step. By raising the formwork and scaffolding at the same time, the preparation time for pouring the upper level of concrete is shortened, reducing construction effort and time.
In the shaft lining method of the present invention, it is preferable that in the formwork scaffolding member raising step, the formwork scaffolding member is raised by a crane via a traverser. According to such a method, the formwork scaffolding member can be smoothly raised while maintaining the horizontal state.

According to the slide form for a shaft and the shaft lining method of the present invention, in constructing a shaft lining concrete, workability can be improved and construction labor and time can be reduced.

FIG. 2 is a plan view showing a state in which the divided pieces of the shaft slide form according to the embodiment of the present invention are located at the outer peripheral position. FIG. 2 is a plan view showing a state in which the divided pieces of the shaft slide form according to the embodiment of the present invention are in an inner position. FIG. 1 is a vertical cross-sectional view showing a slide form for a shaft according to an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view showing the interaction between the shaft slide form and the lining concrete according to the embodiment of the present invention. 4 is a view taken along the line vv in FIG. 3. FIG. 4 is a view taken along the line vi-vi in FIG. 3. FIG. 4 is a view along the line vii-vii in FIG. 3. FIG. (a) is a plan view showing a traverser, and (b) is a sectional view showing a state in which a shaft slide form according to an embodiment of the present invention is lifted up by a crane. FIG. 2 is a cross-sectional view showing a state in which a slide form for a shaft is installed at a concrete placement position at the bottom of a shaft in a formwork scaffolding member installation step of a method for lining a shaft according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a state in which the slide form for a shaft is installed at the second stage concrete placement position from the bottom of the shaft in the formwork scaffolding member installation step of the shaft lining method according to the embodiment of the present invention. FIG. 2 is a cross-sectional view showing a state in which a slide form for a shaft is installed at a concrete placement position several steps above the bottom of a shaft in a formwork scaffolding member installation step of a method for lining a shaft according to an embodiment of the present invention.

A slide form for a shaft and a method for lining a shaft according to an embodiment of the present invention will be described with reference to the attached drawings. First, the structure of the shaft slide form will be explained. Such a shaft slide form includes formwork and work scaffolding for lining the shaft (constructing concrete lining for the shaft).
FIG. 1 is a plan view showing a state in which the divided pieces of the slide form for a shaft are in the outer peripheral position, FIG. 2 is a plan view showing a state in which the divided pieces of the slide form for a shaft are in the inner position, and FIG. It is a longitudinal cross-sectional view showing a slide form for a shaft. Note that in FIGS. 1 to 3, illustration of the scaffolding board is omitted.
As shown in FIGS. 1 to 3, the shaft slide form 1 includes a formwork scaffolding member 10. As shown in FIGS. The formwork scaffold member 10 includes a formwork 20 extending in the circumferential direction of the shaft 2 and a scaffold 30 fixed to the formwork 20. The formwork scaffold member 10 is divided in the circumferential direction of the shaft 2 and includes a divided piece 11 and a deformable piece 12.

A plurality of divided pieces 11 (three in this embodiment) are provided and are rotatably connected to each other. The three divided pieces 11 are composed of one base piece 13 and two rotating pieces 14, 14. Base piece 13 is arranged between two rotating pieces 14, 14. The end of the base piece 13 and the base end of the rotating piece 14 are pin-coupled, so that the base piece 13 and the rotating piece 14 can rotate around a pin P1 that is a vertical axis. The rotating piece 14 rotates between an outer peripheral position and an inner position. The outer peripheral position is a position where the rotating piece 14 is on the same circumference as the base piece 13, and is a position when concrete is poured. The inner position is a position closer to the center of the shaft 2 than the outer peripheral position, and is a position when the shaft slide form 1 is moved.

The deformable piece 12 is provided between the tip portions of the pair of rotating pieces 14 (between the divided pieces 11, 11). The deformable piece 12 is for securing a space for the divided piece 11 to rotate inward, and in this embodiment, is rotatably connected to the tip of the rotating piece 14. The deformed piece 12 includes a first piece 15 and a second piece 16. The base end of the first piece 15 is pin-coupled to the distal end of one of the rotating pieces 14, and the first piece 15 rotates about a pin P2 that is a vertical axis with respect to the one rotating piece 14. It is possible to move. The base end of the second piece 16 is pin-coupled to the tip of the other rotating piece 14, so that the second piece 16 can rotate relative to the other rotating piece 14 around the pin P2. ing. The first piece 15 and the second piece 16 rotate between a fixed position and a retracted position. The fixed position is a position where the first piece 15 and the second piece 16 are on the same circumference as the base piece 13, and is a position when concrete is poured. In order for the first piece 15 and the second piece 16 to be located at the fixed position, the pair of rotating pieces 14, 14 must be located at the outer peripheral position. When both the first piece 15 and the second piece 16 are located at the fixed position, the tip of the first piece 15 and the tip of the second piece 16 are butted against each other, and the pair of rotating pieces 14, 14 are fixed at the outer peripheral position. be done. The retreat position is a position closer to the center of the shaft 2 than the fixed position. When the second piece 16 is rotated first, and then the first piece 15 is rotated, and both are in the retracted position, there is a gap between the tip of the first piece 15 and the tip of the second piece 16. A gap is created, and the pair of rotating pieces 14, 14 can be rotated to the inner position.

The formwork 20 partitions the inner peripheral surface of the concrete lining 3, and is arranged at a predetermined interval from the inner surface of the shaft 2 (excavation surface, wall surface of an earth retaining wall, etc.). The formwork 20 is made of a plate material made of reinforced fiber plastic, for example. A release agent is applied to the surface (outer surface) of the plate material. The release agent is applied to make it easier for the formwork 20 to separate from the concrete. The formwork 20 is divided in the circumferential direction according to the shapes of the divided pieces 11 and the deformed pieces 12. Each of the plurality of divided formworks 21 has an arc shape in plan view. The arc shapes of the divided formwork 21 of the base piece 13 and the rotating pieces 14, 14 have the same length in the circumferential direction, and have a center angle of about 100°. The arc shapes of the divided formwork 21 of the first piece 15 and the second piece 16 have the same length in the circumferential direction and have a center angle of about 30°. All the divided formworks 21, 21, . . . are put together, and the formwork 20 has a cylindrical shape covering the entire circumference of the shaft 2 (see FIG. 1).

The scaffold 30 is a work scaffold for performing reinforcement work, concrete placement work, etc., and is fixed inside the formwork 20 (on the center side of the shaft 2). The scaffolding 30 includes a reinforcing material 31, a pillar material 32, and a scaffolding member 33. The reinforcing material 31 is a horizontal material that reinforces the formwork 20, and is laid along the back surface (inner surface) of the plate material of the formwork 20. The reinforcing member 31 is made of, for example, H-shaped steel, and is arranged so that the web is oriented laterally. The reinforcing material 31 is curved along the curved surface of the formwork 20 (divided formwork 21), and its flange is in contact with the back surface of the formwork 20. The reinforcing members 31 are provided in multiple stages at intervals in the vertical direction. Both circumferential ends of the base piece 13 and the reinforcing members 31 of the rotating pieces 14, 14 are offset shorter than the circumferential ends of the divided formwork 21. Furthermore, the circumferential ends of the reinforcing members 31 at the proximal ends of the first piece 15 and the second piece 16 are offset shorter than the circumferential ends of the divided formwork 21 . A bracket 34 extends from the end of the web of the reinforcing material 31 into the gap between the reinforcing members 31, 31 formed in an offset manner. The tips of the brackets 34, 34 extending from the opposite ends of the reinforcing members 31, 31, respectively, overlap and are joined by pins P1 or P2. The circumferential ends of the reinforcing members 31 at the distal ends of the first piece 15 and the second piece 16 are butted against each other. This butt line L is inclined with respect to the radial direction of the shaft 2. A radially inner portion of the circumferential end of the reinforcing member 31 at the tip of the second piece 16 projects toward the first piece 15 side. That is, the reinforcing material 31 at the tip of the second piece 16 locks the reinforcing material 31 at the tip of the first piece 15 from the inside in the radial direction.

The column member 32 is a vertical member that connects the upper and lower reinforcing members 31, and is welded and fixed to the inner flange of the reinforcing member 31. The pillar material 32 is constructed by, for example, combining channel steel back to back. In the channel steel, webs extend along the radial direction of the shaft 2, and the webs are arranged with gaps between them. The pair of channel steels are integrated by extending plates (anchor bolt fixing brackets 35 and 36 to be described later) between flanges on the inside in the radial direction. A plurality of pillar members 32 of the base piece 13 and the rotating pieces 14, 14 are provided at intervals in the circumferential direction of the reinforcing member 31 (in this embodiment, four pillar members are provided for each piece). One pillar material 32 of the first piece 15 and the second piece 16 is provided in the circumferentially intermediate portion of the reinforcing material 31.
An anchor bolt fixing bracket 35 is provided on the upper part of the pillar member 32. The anchor bolt fixing bracket 35 is composed of a plate that connects a pair of back-to-back channel steels, and is provided with a bolt insertion hole (not shown). A Siebold B2 is inserted into the anchor bolt fixing bracket 35. The sea bolt B2 is attached to the tip of the anchor bolt B1 reinforced at the concrete placement position, and a nut is screwed into the portion protruding from the anchor bolt fixing bracket 35. By fixing the anchor bolt B1 to the anchor bolt fixing bracket 35 via the Siebold B2, the anchor bolt B1 can be prevented from shifting during concrete pouring, and the formwork 20 can be further reinforced.

FIG. 4 is an enlarged sectional view showing the interaction between the shaft slide form and the lining concrete. As shown in FIG. 4, the lower ends of the pillars 32 protrude below the lower ends of the formwork 20. Anchor bolt fixing brackets 36 are provided on the downwardly projecting portions of the pillars 32. The anchor bolt fixing bracket 36 has the same shape as the upper anchor bolt fixing bracket 35. A Siebold B2 is inserted through the anchor bolt fixing bracket 36. The sea bolt B2 is attached to the tip of the anchor bolt B1 buried in the lower cast concrete (lined concrete) 3, and a nut is screwed into the part that protrudes inward from the anchor bolt fixing bracket 36. ing. By fixing the anchor bolt B1 to the anchor bolt fixing bracket 36 via the Siebold B2, the shaft slide form 1 can be fixed to the cast concrete (lining concrete 3) in the lower stage. The anchor bolts B1 are arranged corresponding to the installation position of each pillar member 32, and a plurality of anchor bolts (14 in this embodiment) are provided at predetermined intervals in the circumferential direction.

A standing adjustment means 37 is provided below the anchor bolt fixing bracket 36. The standing adjustment means 37 is for adjusting the standing angle of the column 32, and is a long bolt extending from the lower end of the column 32 toward the inner circumferential surface of the poured concrete (lining concrete 3). It is equipped with 38. The long bolt 38 is inserted into a nut 40 fixed to the fixing bracket 39, and rotates around its axis to advance and retreat with respect to the inner circumferential surface of the poured concrete. A pad-shaped pressing member 41 is provided at the outer end of the long bolt 38. By rotating the long bolt 38 and pressing the holding member 41 against the inner peripheral surface of the poured concrete, the vertical angle of the column 32 is adjusted. Thereby, the installation angle of the formwork 20 becomes a desired angle.

A fall prevention fitting 43 is provided above the anchor bolt fixing bracket 36. The fall prevention fitting 43 is a part that supports the formwork scaffolding member 10 in the event that the Siebold B2 comes off from the anchor bolt fixing bracket 36. The fall prevention fitting 43 includes a support frame 44 and a fixing bracket 45. The support frame 44 is formed in a U-shape when viewed from the side, and is welded to the radially outer surface of the lower end portion of the column member 32 . The support frame 44 extends toward the poured concrete (lined concrete 3), and its outer end surface is flush with the outer surface of the formwork 20. The fixing bracket 45 is a plate-like member attached to the tip member of the support frame 44, and includes a bolt insertion hole (not shown). A bolt B4 connected to an internal threaded anchor B3 buried in the cast concrete (lined concrete 3) is inserted into the bolt insertion hole of the fixing bracket 45.

FIG. 5 is a diagram showing the upper stage scaffolding, and is a view taken along the line vv in FIG. 3. FIG. 6 is a diagram showing the middle scaffold, and is a view taken along the line vi-vi in FIG. 3. FIG. 7 is a diagram showing the lower scaffold, and is a view taken along the line vii-vii in FIG. 3.
As shown in FIG. 3, the scaffolding member 33 is a part on which a worker rides, and extends radially inward from the inside of the formwork 20. The scaffolding member 33 is provided on the base piece 13 and the rotating pieces 14, 14. The first piece 15 and the second piece 16 are not provided with the scaffolding member 33. The scaffolding member 33 includes an upper scaffolding member 33a, a middle scaffolding member 33b, a lower scaffolding member 33c, and a hanging scaffolding member 33d.

As shown in FIGS. 1 to 3 and 5 to 7, the upper scaffolding member 33a, the middle scaffolding member 33b, and the lower scaffolding member 33c each have a support frame 50 and a scaffold board 51 (see FIGS. 5 to 7). We are prepared. The support frame 50 is a frame that supports the scaffold board 51, and is made of, for example, H-shaped steel. As shown in FIGS. 1 and 2, the support frame 50 includes a pair of hypotenuse frames 53, 53 and an inner end frame 54. As shown in FIGS. The base end of the oblique frame 53 is welded to the circumferential end of the reinforcing member 31 . The hypotenuse frame 53 extends linearly toward the center of the shaft 2 substantially along the radial direction. The inner tip of the hypotenuse frame 53 does not reach the center of the shaft 2, and the hypotenuse frame 53 is formed shorter than the radius of the formwork 20. Between the base piece 13 and the rotating piece 14, the adjacent hypotenuse frames 53, 53 are arranged with a gap between them, so that even if the rotating piece 14 rotates with respect to the base piece 13, they will not interfere. It is configured as follows.

The inner end frame 54 is formed in a straight line that connects the ends of the hypotenuse frames 53, 53. A reinforcing frame 55 is provided on the radially outer surface of the inner end frame 54 . The reinforcing frame 55 is appropriately stretched between the inner end frame 54 and the reinforcing member 31. A diagonal member 56 extending to the tip of the oblique side frame 53 is appropriately connected to the reinforcing frame 55 . A connecting member 57 is provided on the radially inner surface of the inner end frame 54 . The connecting member 57 is made of, for example, H-shaped steel and extends in the vertical direction. The connecting member 57 spans the inner edge frame 54 of the upper scaffolding member 33a, the inner edge frame 54 of the middle scaffolding member 33b, and the upper and lower inner edge frames 54 of the lower scaffolding member 33c, and is welded to each other. There is.

A split piece rotating means 70 is spanned between the left and right rotating pieces 14. In this embodiment, one end of the split piece rotating means 70 is connected to the tip portion (one end portion on the far side from the base piece 13) of the inner tip side frame 54. The divided piece rotating means 70 is a member for rotating the divided piece between an outer circumferential position and an inner position, and is constituted by an expandable and contractible connecting member. The divided piece rotating means 70 is constituted by, for example, a long turnbuckle, and by rotating a threaded portion at the center, the entire length of the turnbuckle is expanded or contracted. The end of the turnbuckle shaft is pin-coupled to a fixing bracket 58 attached to the connecting member 57. The split piece rotating means 70 is provided at two locations: below the upper scaffolding member 33a at the upper end of the connecting member 57, and above the lower scaffolding member 33c at the lower end of the connecting member 57. When the turnbuckle is extended, the circumferential tips of the rotating pieces 14, 14 are pushed apart, and the rotating pieces 14, 14 are arranged at the outer circumferential position. When the turnbuckle is retracted, the circumferential tips of the rotating pieces 14, 14 are drawn together, and the rotating pieces 14, 14 are disposed in the inner position.

A deformable piece moving means 71 is spanned between the rotating piece 14 and the first piece 15 (or the second piece 16). In this embodiment, one end of the deformable piece moving means 71 is connected to one end of the inner tip side frame 54 on the side far from the base piece 13, and one end of the deformable piece moving means 71 is connected to one end of the inner end side frame 54 on the side far from the base piece 13, and the pin P2 of the first piece 15 (or second piece 16) The other end of the deformable piece moving means 71 is connected to a position apart from the deformable piece moving means 71 . The deformable piece moving means 71 is a member for moving the deformable piece 12 between the fixed position and the retracted position, and is composed of an expandable and contractible connecting member. Similar to the divided piece rotating means 70, the deforming piece moving means 71 is composed of, for example, a long turnbuckle, and the entire length of the turnbuckle is expanded or contracted by rotating a threaded portion at the center. One end of the turnbuckle is pin-coupled to a fixed bracket 58. The other end of the turnbuckle is pin-coupled to a fixing bracket 73 attached to the pillar 32 of the first piece 15 (or second piece 16). The deformed piece moving means 71 is provided at two locations: below the upper scaffolding member 33a at the upper end of the connecting member 57, and above the lower scaffolding member 33c at the lower end of the connecting member 57. When the turnbuckle is extended, the circumferential tip of the first piece 15 (or second piece 16) is pushed outward in the radial direction, and the first piece 15 (or second piece 16) is placed in a fixed position. Ru. When the turnbuckle retracts, the circumferential tip of the first piece 15 (or second piece 16) is pulled radially inward, and the first piece 15 (or second piece 16) is placed in the retracted position. Ru.

As shown in FIGS. 5 to 7, the scaffold board 51 is laid on the support frame 50 so as to cover the inner space of the support frame 50. As shown in FIGS. The outer edge of the scaffolding board 51 extends to a position above the reinforcing member 31. The scaffold board 51 is made of, for example, a mesh plate. Note that a notch 59 is formed at the position where the pillar 32 is placed, so that the scaffold board 51 and the pillar 32 do not interfere with each other. A peripheral edge of the inner portion of the scaffold board 51 extends along the support frame 50.
As shown in FIG. 5, in the upper scaffolding member 33a, the scaffolding plate 51 on the distal end side of the rotating piece 14 projects above the deformable piece 12. When the rotating pieces 14, 14 are at the outer peripheral position, the space between the rotating pieces 14, 14 (more specifically, the tip of the overhanging part 51a of the scaffolding board 51 on the distal end side of one rotating piece 14) and the tip of the overhanging portion 51a of the scaffolding board 51 on the tip side of the other rotary piece 14), a gap is formed. A small scaffolding board 60 having a trapezoidal shape in plan view is placed over this gap along the shape of the gap. On the other hand, on the gap between the base piece 13 and the rotating piece 14, a small scaffold board 61 formed in a rectangular shape in plan view is laid so as to cover this gap. The surfaces of the small scaffolding boards 60 and 61 are configured to be flush with the scaffolding board 51. An opening 62 having a trapezoidal shape in plan view is formed between the scaffolding plate 51 of the base piece 13 and the scaffolding plates 51, 51 of the rotating pieces 14, 14. The opening 62 is a space for carrying in a temporary scaffolding 90 (see FIG. 11) provided below after the vertical shaft slide form 1 is fixed. After the temporary scaffolding 90 is brought in, a lid-like scaffolding board (not shown) is installed to cover the opening 62. The surface of the lid-shaped scaffold board is configured to be flush with the scaffold board 51. A handrail member 63 is erected on the outer peripheral edge of the scaffold board 51 and the inner peripheral edge (above the inner end frame 54). When installing the lid-like scaffolding material, the handrail member 63 on the inner peripheral edge is removed. A lid plate portion 64 is formed on the scaffolding plate 51 of the base piece 13. The lid plate portion 64 is a lid with a hinge structure on one side, and is opened by rotating upward. A stair member 65 connected to the middle scaffold member 33b is provided below the cover plate portion 64. By rotating the cover plate portion 64 to the open position, the stair member 65 can be used. Note that the installation positions of the cover plate part 64 and the stair member 65 are not limited to the base piece 13, and may be the rotating piece 14.

As shown in FIG. 6, in the middle scaffolding member 33b, the scaffolding board 51 of the base piece 13 and the scaffolding board 51 of the rotating piece 14 both have inner peripheral edges extending along the support frame 50. are doing. That is, the scaffold board 51 of the middle scaffold member 33b does not protrude above the deformable piece 12 like the scaffold board 51 of the upper scaffold member 33a. When the rotating pieces 14, 14 are at the outer peripheral position, there is a space between the scaffolding plate 51 of one rotating piece 14 and the scaffolding plate 51 of the other rotating piece 14 (the space above the deformable piece 12). , a general scaffolding board 66 that is rectangular in plan view is spanned. A small scaffolding board 61 having a rectangular shape in plan view is installed between the base piece 13 and the rotating piece 14 so as to cover the gap. A handrail member 63 is erected on the inner peripheral edge of the scaffold board 51 (above the inner end frame 54). A lid plate portion 64 is formed on the scaffolding plate 51 of one of the rotating pieces 14 . A ramp 68 connected to the lower scaffolding member 33c is provided below the cover plate portion 64. By rotating the cover plate portion 64 to the open position, the ramp 68 can be used. Note that the installation positions of the cover plate part 64 and the ramp 68 are not limited to the rotating piece 14, and may be the base piece 13.

As shown in FIG. 7, in the lower scaffolding member 33c, similarly to the middle scaffolding member 33b, both the scaffolding board 51 of the base piece 13 and the scaffolding board 51 of the rotating piece 14 have inner peripheral edges that are It extends along the support frame 50. When the rotating pieces 14, 14 are at the outer peripheral position, there is a space between the scaffolding plate 51 of one rotating piece 14 and the scaffolding plate 51 of the other rotating piece 14 (the space above the deformable piece 12). , a general scaffolding board 66 that is rectangular in plan view is spanned. A small scaffolding board 61 having a rectangular shape in plan view is installed between the base piece 13 and the rotating piece 14 so as to cover the gap. A handrail member 63 is erected on the inner peripheral edge of the scaffold board 51 (above the inner end frame 54). The upper end of a ramp 69 used when moving between the lower scaffold member 33c and the lower temporary scaffold 90 (see FIG. 11) is locked to the scaffold board 51 of the base piece 13. Note that the position where the ramp 69 is locked is not limited to the base piece 13, and may be the rotating piece 14.

As shown in FIG. 3, the hanging scaffold member 33d is a scaffold provided below the lower scaffold member 33c, and is provided below the base piece 13 and the rotating pieces 14, 14. The hanging scaffold member 33d can be retrofitted to the lower end of the pillar material 32. The suspended scaffolding member 33d includes a hanging member 75, an overhanging member 76, a scaffold board (not shown), a diagonal member 77, and a handrail member 63. The hanging material 75 is connected to the lower end of the pillar material 32. The hanging material 75 is joined during on-site construction within the shaft 2. The overhanging members 76 extend radially inward from the lower end of the hanging member 75 and are arranged radially at predetermined intervals in the circumferential direction. The diagonal member 77 extends obliquely between the hanging member 75 and the overhang member 76, and increases the load supported by the overhang member 76. The scaffolding board (not shown) is stretched between adjacent overhanging members 76, 76, and is arranged in the circumferential direction along the base piece 13 and the rotating pieces 14, 14.

FIG. 8(a) is a plan view showing the traverser, and FIG. 8(b) is a sectional view showing the vertical shaft slide form lifted by a crane. As shown in FIG. 8, the vertical shaft slide form 1 is lifted by a crane via a traverser 80. The traverser 80 is a member for hoisting the formwork scaffolding member 10 horizontally using a crane wire 83, and includes a frame member 81 and a locking bracket 82. The frame member 81 is configured by assembling, for example, metal square pipes into an octagonal shape that fits inside the outer circumferential circle of the shaft slide form 1. A reinforcing member is appropriately stretched around the inside of the frame member 81. The locking brackets 82 are for locking the wires 83 that hang the frame member 81, and a plurality of locking brackets 82 are provided along the outer periphery of the frame member 81 in a well-balanced manner. The locking brackets 82 are provided on both the upper and lower surfaces of the frame member 81. A plurality of wires 83a, which are hooked to hooks 84 provided at the tips of wires 83 extending from the crane, are locked to the upper locking bracket 82. Wire 83a diverges from hook 84 and is slanted. A wire 83b extending to the formwork scaffolding member 10 is also locked from the hook 84. A wire 83c, which is fixed to the upper end of the column 32 of the formwork scaffolding member 10, is fixed to the lower locking bracket 82. The wire 83c between the traverser 80 and the formwork scaffold member 10 hangs down. By suspending the formwork scaffolding member 10 with a crane via the traverser 80 in this way, the shaft slide form 1 can be raised while maintaining the horizontal state.

Next, a method for lining a shaft according to this embodiment will be described with reference to FIGS. 9 to 11. Figure 9 is a cross-sectional view showing the shaft slide form installed at the concrete placement position at the bottom of the shaft in the formwork scaffolding member installation process of the shaft lining method. Figure 11 is a cross-sectional view showing the shaft slide form installed at the second level of concrete pouring position from the bottom of the shaft. FIG.
The method for lining a shaft includes a formwork scaffolding member installation process, a reinforcement process, a concrete placement process, and a formwork scaffolding member raising process, and each process is repeated in sequence.

The formwork scaffolding member installation process is a process of installing the formwork scaffolding member 10 at a concrete placement position inside the shaft 2. In the step of installing the formwork scaffolding member at the bottom of the shaft 2, the shaft slide form 1 is suspended by a wire 83 of a crane via a traverser 80 (see FIG. 8), and placed on the bottom 2a of the shaft 2. As shown in FIG. 9, when installing on the bottom 2a of the shaft 2, the hanging scaffold member 33d is not provided, and the lower scaffold member 33c is placed on the bottom 2a. In the shaft slide form 1, the scaffolding 30 is fixed to the formwork 20 in advance, so the formwork 20 and the scaffolding 30 are installed at the same time by installing the formwork scaffolding member 10 at a predetermined position.
The reinforcement process is a process of arranging reinforcing bars for the lining concrete 3. In the reinforcing step, in addition to reinforcing the lining concrete 3, anchor bolts B1, Siebolds B2, internally threaded anchors B3, drain pipes (not shown), etc. are installed at predetermined positions. Anchor bolts B1 and Siebolds B2, internally threaded anchors B3, and drain pipes are radially arranged at positions corresponding to the upper part of the concrete lining 3 placement position.

The concrete placing process is a process of placing concrete between the formwork 20 and the excavated surface of the shaft 2. In the concrete pouring process, a worker stands on the upper scaffolding member 33a and pours concrete.
The formwork scaffolding member raising process is a process of shrinking the formwork scaffolding members inward and raising them to the next concrete placement height after the poured concrete has hardened. In the formwork scaffolding member raising process, as shown in FIG. 2, first, one deformable piece moving means 71 is retracted, and the second piece 16 is rotated from the fixed position to the retracted position. Thereafter, the deformable piece moving means 71 is retracted, and the first piece 15 is rotated from the fixed position to the retracted position. Thereby, a rotation space for the rotation pieces 14, 14 is secured. Then, by retracting the divided piece rotating means 70 and drawing the tips of the rotating pieces 14, 14 together, the rotating pieces 14, 14 are arranged from the outer peripheral position to the inner position. As a result, a gap is created between the formwork 20 and the inner circumferential surface of the concrete lining 3, and the shaft slide form 1 is separated from the inner circumferential surface of the concrete. Then, it becomes possible to raise the vertical shaft slide form 1. At this time, since a release agent is applied to the surface of the formwork 20, the formwork 20 is easily peeled off from the concrete. Furthermore, since concrete is less likely to adhere to the surface of the formwork 20, cleaning work for the formwork 20 can be omitted.
Then, as shown in FIG. 10, the vertical shaft slide form 1 is suspended by crane wires 83, 83a, 83b, and 83c via the traverser 80, and raised to a predetermined height. After raising the formwork scaffolding member 10, the hanging scaffolding member 33d is installed at the lower end of the pillar material 32.

After that, in the formwork scaffold member installation process above the second stage, the Siebold B2 protruding from the top of the concrete lining 3 is temporarily fixed to the anchor bolt fixing bracket 36, and the shaft slide form 1 is fixed at a predetermined height. do. After adjusting the standing angle of the pillar material 32 by the standing adjustment means 37, the Siebold B2 is fixed to the anchor bolt fixing bracket 36.
Since the shaft slide form 1 is supported via the anchor bolt B1 in this manner, the shaft slide form 1 can be easily fixed at a predetermined height, and the time required for installing the formwork can be shortened. Specifically, the formwork installation period, which previously required 2 to 3 days with conventional construction methods, can be shortened to 1 day. Then, the vertical adjustment means 37 adjusts the standing angle of the formwork scaffolding member 10 to make the pillars 32 vertical. Furthermore, the bolt B4 of the fall prevention fitting 43 is connected to the internal threaded anchor B3 on the upper part of the concrete lining 3.

Thereafter, a reinforcement process and a concrete placing process are performed to construct the lining concrete 3. In the next step, the formwork scaffolding member raising step, the anchor bolts B1 and internal threaded anchors B3 are disconnected before the raising work. By repeating the above steps, the concrete lining 3 is constructed step by step at each predetermined height.
After the shaft slide form 1 has been raised in multiple stages, a temporary scaffolding 90 is assembled below the shaft slide form 1, as shown in FIG. The materials for the temporary scaffolding 90 are suspended by a crane through the opening 62 between the scaffolding board 51 of the base piece 13 and the scaffolding boards 51, 51 of the rotating pieces 14, 14. After the temporary scaffolding 90 is transported, a lid-shaped scaffold board is installed in the opening 62 to close the opening 62. This makes the upper platform wider and greatly improves work efficiency.

According to the shaft slide form 1 and the shaft lining method described above, the following effects are achieved. That is, according to the shaft slide form 1 according to the embodiment of the present invention, since the scaffolding 30 is fixed to the formwork 20, the gap between the scaffolding 30 and the formwork 20 can be reduced. As a result, the formwork 20 serves as a side wall of the scaffolding 30 and the workability is improved. Furthermore, since the radially outer peripheral edge of the scaffolding board 51 is located on the reinforcing material 31, even if a worker drops an object from the outer peripheral edge of the scaffolding board 51, the reinforcing material 31 I can accept it. In addition, the opening 62 is covered with a lid-like scaffolding member, and the gap between the divided pieces 11, 11 is covered with small scaffolding boards 60, 61, so the entire scaffolding of the upper scaffolding member 33a is covered, greatly improving workability. becomes good.

On the other hand, the formwork scaffold member 10 deforms the deformable piece 12 to rotate the divided piece 11 inside the shaft 2, and the fixed state with the concrete lining 3 of the shaft 2 is released. This allows the formwork scaffolding member 10 (shaft slide form 1) to rise. At this time, since the scaffold 30 is fixed to the formwork 20, the formwork scaffolding member 10 can be raised as one piece. Furthermore, since the scaffolding 30 also rises and becomes installed at the same time as the formwork 20 is raised, there is no need to assemble the scaffolding to the same height as the formwork 20. Therefore, the next process such as reinforcing reinforcement can be started immediately, the time required to prepare for pouring concrete on the upper stage is shortened, and the construction work and time can be reduced.

In addition, in the shaft slide form 1 of this embodiment, the split piece rotating means 70 is spanned between the rotating pieces 14, 14, so that the split piece rotating means 70 can be easily expanded and contracted. The rotating piece 14 can be rotated.
Further, since the pair of rotating pieces 14, 14 are provided at both ends of the base piece 13, the rotating pieces 14, 14 can be rotated in a stable state while the base piece 13 is fixed.
Further, since the formwork 20 is made of a plate made of reinforced fiber plastic, it is lightweight.

According to the shaft lining method according to the present embodiment, the formwork scaffolding member 10 in which the scaffolding 30 is fixed to the formwork 20 is used, so that the gap between the scaffolding 30 and the formwork 20 can be reduced. As a result, the formwork 20 serves as a side wall of the scaffolding 30 and the workability is improved.
On the other hand, by rotating the rotating pieces 14, 14 of the formwork scaffolding member 10 inward, the fixed state of the vertical shaft 2 with the lining concrete 3 is easily released. This enables the formwork scaffolding member 10 to be raised in the formwork scaffolding member raising process. At this time, since the scaffold 30 is fixed to the formwork 20, the formwork scaffolding member 10 can be raised as one piece. Furthermore, since the scaffolding 30 is also raised and installed at the same time as the formwork 20 is raised, the time required to prepare for pouring concrete on the upper stage is shortened, and construction work and time can be reduced.
In the formwork scaffolding member raising process, by lifting the formwork scaffolding member 10 with a crane via the traverser 80, the formwork scaffolding member 10 can be smoothly raised while maintaining a horizontal state.

Although the embodiments for carrying out the present invention have been described above, the present invention is not intended to be limited to the above-described embodiments, and design changes can be made as appropriate without departing from the spirit of the present invention. For example, in the embodiment, the deformable piece 12 is composed of two pieces, the first piece 15 and the second piece 16, but the present invention is not limited to this. The deformable piece may be composed of one piece and rotated around one end to ensure a movement space for the rotating piece 14.

In addition, in this embodiment, the divided piece rotation means 70 and the deformed piece moving means 71 are configured with turnbuckles, but are not limited to this, and other means such as a telescopic jack may be used. You can.

1 Slide form for shaft 2 Shaft 3 Lining concrete 10 Formwork scaffolding member 11 Divided piece 12 Deformed piece 13 Base piece 14 Rotating piece 15 First piece 16 Second piece 20 Formwork 21 Divided formwork 30 Scaffolding 50 Support frame 51 Scaffolding board 70 Divided piece rotating means 71 Deformed piece moving means 80 Traverser

Claims (7)

A shaft slide form for lining a shaft,
A formwork scaffolding member having a formwork extending in the circumferential direction of the shaft and a scaffold fixed to the formwork,
The formwork scaffolding member is divided in the circumferential direction and includes a plurality of divided pieces rotatably connected to each other, and a deformable piece provided between the divided pieces,
The formwork is divided in the circumferential direction according to the shapes of the plurality of divided pieces and the deformed piece,
The scaffold is divided in the circumferential direction according to the shape of the plurality of divided pieces, and each is fixed inside the formwork,
The scaffolds that are adjacent to each other in the circumferential direction are arranged at intervals that do not interfere with each other when the divided pieces rotate.
A slide form for vertical shafts. The scaffold includes reinforcing members that are horizontal members that reinforce the formwork, pillar members that are vertical members that connect the reinforcing members arranged in the vertical direction, and that extend radially inward from the inside of the formwork. Equipped with scaffolding components
The slide form for a vertical shaft according to claim 1. A split piece rotating means for rotating the pair of split pieces between an outer peripheral position and an inner position is spanned between the pair of split pieces arranged to sandwich the deformed piece. The slide form for a vertical shaft according to claim 1. The slide form for a shaft according to claim 1, wherein the divided piece includes a base piece and a pair of rotating pieces connected to both ends of the base piece. The deformable piece is rotatably connected to the divided piece,
A deformable piece moving means for moving the deformable piece between a fixed position and a retracted position is spanned between the divided piece and the deformable piece. The slide form for shafts according to any one of Item 4. A method for lining a shaft using the shaft slide form according to claim 1, comprising :
a formwork scaffolding member installation step of installing the formwork scaffolding member at a concrete placement position inside the shaft;
a concrete pouring step of pouring concrete between the formwork and the inner surface of the shaft;
After the concrete has hardened, the deformable piece of the formwork scaffolding member is deformed and the plurality of divided pieces including the formwork and the scaffolding are rotated inwardly, so that the formwork scaffolding member is turned inward. A method for lining a vertical shaft, characterized by sequentially repeating the step of raising the formwork scaffolding member by contracting it and raising it to the next concrete pouring height. 7. The shaft lining method according to claim 6, wherein in the formwork scaffolding member raising step, the formwork scaffolding member is raised by a crane via a traverser.

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