JPH0826752B2 - Self-propelled formwork structure and formwork method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-propelled formwork structure used for lining civil engineering works such as tunnels, sewers, drains, and tunnels, or placing concrete, and a formworking method using the same. Regarding

[0002]

2. Description of the Related Art Conventionally, in civil engineering works such as tunnels, sewers, drains, tunnels, etc., piers, struts, weir boards, etc. have been used as formwork structures used for forming and supporting when lining concrete. The one assembled at the construction site is used. Further, in consideration of the requirement of supporting strength and the point that it can be repeatedly used, recently, a steel form structure including steel panels, steel columns, connecting rods and the like has been widely used.

[0003]

In the above-mentioned conventional example, the wooden formwork structure assembled from the splints, dam plates, etc. has poor strength, and duplicate use of the members is hardly possible, and it takes a lot of time and labor. It requires a skilled worker and has a problem of low assembly and installation efficiency.On the other hand, the steel formwork structure erected by steel panels, steel columns, rods, etc., has a heavy weight of each component, and handling and handling. Is inconvenient and tightens each panel with a turnbuckle, rod, bolts and nuts, etc.
It is necessary to connect and fix it, which is extremely troublesome in construction,
Not only the completion time is prolonged, but after the concrete is poured, when the strength of the initial hardening of the concrete is reached, the formwork structure is dismantled and the disassembled panels, columns, rods, turnbuckles, etc. are classified. Since it has to be organized, moved to the latter section, and reassembled, the work of disassembling, organizing, reassembling, erection etc. of the formwork must be repeated until the entire lining is completed. It takes a lot of time and effort, especially after the completion of the formwork structure, most of the work space inside the formwork is occupied by the connecting support members such as connecting rods and stays installed vertically and horizontally, and this space is effectively used. It is difficult to proceed with the construction or work of the next section at the same time,
Therefore, there is a problem that the construction efficiency of the whole construction process and the construction completion period are greatly affected.

While labor costs are increasing due to labor shortages, the process completion date is becoming more and more important nowadays, and automation and rationalization of erection work for formwork structures and work, and significant labor cost savings are possible. Needless to say, there is a demand in the industry for the development of various formwork devices and their construction methods.

[0005]

The self-propelled formwork structure of the present invention is made to solve the above-mentioned problems.
An expandable / reducible frame 10 composed of at least one set of X-type link sets A ₁ , A ₂ ... Which exhibit X-shaped intersections with each other on a three-dimensional multi-plane and are linked so as to interlock with each other. The deformable frame 10 is mounted on at least one plane, generally two planes or more, of the outer peripheral surface of the deformable frame 10.
.. are linked to each other by the expanding and deforming operation of the frame 10 by the interlocking of the mold link sets A ₁ , A ₂ ... To form the molds having a predetermined shape, and they are staggered by the shrinking and deforming operation of the frame 10. Multiple panels that are divided and separated 2
A panel set 20 composed of 1, 22, ... And one or both ends of the deformable frame 10 or an arbitrary X-type link set at an intermediate portion is vertically and horizontally expandably and contractibly attached to operate the link set. Then, the frame 10 is provided with an expansion and contraction drive device 30 that drives the frame 10 to expand and contract and expand and contract.

According to the formwork method of the present invention, a wheel for supporting and moving the formwork structure is attached to the lower end of the formwork structure, and the formwork structure is placed at the planned lining work inside an excavated tunnel or the like. After moving and fixing, the panel set 20 is molded into a formwork suitable for concrete lining by expanding and closely contacting the frame 10 by the expansion operation of the expansion and contraction drive device 30, and then the concrete is used as the earth wall of the tunnel. implanted in a space formed between the panel set 20 of mold, while the panel set 20 frames 10 in a contracted operation of the telescopic drive device 30 after the initial curing of the concrete by the this to condensation径伸length deformed together with the frame 10 concrete While being removed from the wall surface, a plurality of divided and separated panels 21, 22 ... Which do not interfere with each other are formed, and then the frame 10 The front end in the longitudinal direction is fixed, and the expansion / contraction drive device 30 drives the other end of the frame 10 to move closer to one end where the other end is fixed and to expand the diameter, while advancing the formwork structure to the inner part of the tunnel, and at the same time, to the panel. Mold the set again into a shape suitable for concrete pouring work, perform the next stage of concrete pouring work, and after hardening the concrete, further divide the mold by the operation of the expansion and contraction driving device, demold, This is a formwork method in which operations such as forward movement are repeated.

[0007]

Operation: The formwork structure is moved to the site where the lining work such as a tunnel is to be carried out by the telescopic drive device 30 mounted alternately so as to crawl, and then stopped at a predetermined position, and then expanded and contracted. By expanding and contracting the diameter of the frame 10 of the formwork structure by the extension operation of the drive device 30, the panel set 20 attached to the frame 10 can be automatically assembled and molded into a predetermined mold suitable for concrete pouring. After the concrete is set and hardened, the frame 10 is contracted and expanded by the contraction operation of the expansion and contraction driving device 30 so that the panel set 20 is deformed and displaced together with the frame 10 from the concrete wall surface, and at the same time, does not interfere with each other. A plurality of panels 21, 22 ...
The mold structure can be returned to its original state. In this way, the entire formwork can be moved while expanding and contracting as if it were crawling with a telescopic drive device mounted on itself, and by the single operation of expansion and contraction of the drive device, a plurality of panels 21, 22 ... Since the panel set 20 to be formed can also be quickly assembled and molded into a predetermined mold and separated from the mold by one action, it can be easily operated by one worker. Furthermore, since there are no vertical or horizontal connecting rods, stays, or other members inside the formwork that interfere with the space after the mold is formed, it is necessary to dig through the formwork and excavate and carry out the next section. You can proceed and speed up the construction completion period.

[0008]

FIG. 1 is a partially exploded perspective view showing a semi-expanded state of an embodiment of the self-propelled formwork structure of the present invention, and FIG. 2 shows that the formwork structure shown in FIG. And a partially omitted perspective view showing a state of being molded into a predetermined mold, and FIG. 3 is an enlarged perspective view of an embodiment of a pivotally attached portion of the mold structure shown in FIG.

As is apparent from the drawings, the self-propelled formwork structure of the present invention basically comprises a plurality of link sets which intersect each other in an X-shape in a three-dimensional multi-plane and are pivotally attached together. A variable frame 10 that is a panel support frame and is formed by continuously connecting A ₁ , A _2, ...
0 is attached to at least one flat surface of the outer peripheral surface, generally a plurality of surfaces, and is molded into a mold of a predetermined shape in close contact with each other as the deformable frame 10 expands or contracts or expands or contracts. A panel set 20 composed of a plurality of panels 21, 22 ...
Vertically or horizontally extendably attached between the X-shaped link sets at both ends of the frame 10 or at any position in the middle or in the middle, and the link sets A ₁ , A ₂ ...
And an expansion and contraction drive device 30 that drives the frame 10 to expand and contract the diameter and expand and contract the diameter.

The deformable frame 10 is formed by connecting at least one set, usually two or more sets of three-dimensional multi-plane X-type link type basic link sets A ₁ , A ₂ , A ₃ ...
Wherein the respective link sets A _1, A ₂ · · · are provided in two left and right side opposite each other, two bar-shaped longitudinal link pivotally attached rotatably to each other a central portion by a pin P ₁ 11, 12
A pair of X-type link 1a made of, 1a and, on face each other, is provided in a downward direction, the pin P the central portion as described above
_A pair of X-shaped horizontal links 1b, 1b composed of two rod-shaped horizontal links 13, 14 pivotally attached to each other by ₁
And the pair of the X-shaped vertical links 1a, 1a and the X-shaped horizontal links 1b, 1b are pivotally connected to each other at their upper, lower, left and right positions by a pin P ₁ so as to be rotatable with respect to each other. And a connecting member 15 forming a bowl-shaped assembly.

X-type vertical links 1a, 1a and X-type horizontal links 1
One example of the structure of the pivotal connection with b and 1b is as shown in FIG. Specifically, the connecting member 15 is vertical links 1a and horizontal links 1b ends of the inserted and fitted respectively in the pin P ₁ groove 15a and the lateral direction of the longitudinal direction of pivotally these ends rotatably The two members 151 and 152 each having a U-shaped cross section and provided with the concave groove 15b are integrally or rotatably connected to each other.

When linking the link sets A ₁ , A _2, ..., The vertical links 12 and the second links 12 of the first link set A ₁
The vertical links 11 of the link set A ₂ are overlapped with each other and are fitted into the concave grooves 15a of the connecting member 15, and are stopped by the pin P ₁ . Also, the horizontal link 13 above the first link set A ₁ and the second link 13
The upper horizontal link 14 of the link set A ₂ is overlapped and inserted into the groove 15b of the connecting member 15, and is stopped by the pin P ₁ . This is the pivot joints M and N at both upper corners of the link set.
In the case of the pivotal connection parts m and n at both lower corners, the vertical link 11 of the first link set A _{1 and} the vertical link 12 of the second link set A ₂ are recessed groove 1.
To 5a, and horizontal links 1 of the lower first link set A ₁
3 and the horizontal link 14 below the second link set A ₂ are respectively fitted into the recessed grooves 15b and fixed by the pin P ₁ . In this way, the first link set A ₁ to the second, third ...
The frame 10 is configured by connecting the nth link sets A ₂ , A ₃ ... An according to the required number.

The connecting members 15 located at the respective corners M, N, m, n are exactly the same, and only the mounting direction is different. Further, the link members 11, 12, 13, and 14 also have the same structure or the same size, whereby the simplification and unification of the component parts can be achieved. As a matter of course, the connecting member 15 is not limited to the above-described structure, and can be formed in various appropriate shapes and structures. In addition, a bearing is attached to the pin P ₁ portion of the link set. It is also possible to make the operation smoothly.

Each of the links 1 is attached to four corner pivot points of the first link set A ₁ at the front end of the frame 10 and the rearmost end of the nth link set An at the rear end.
Although one end of 1, 12 and 13, 14 is not connected to the link member of the other link set, the same connecting member 15 can be used. In this case, a spacer or washer 16 having the same thickness as that of the link member may be attached to the open space in the recessed grooves 15a and 15b because there is no other link member.

The frame assembly 10 configured as described above includes a pair of left and right X-shaped links 1a and 1a, and a pair of upper and lower X-shaped links 1b and 1b, a connecting member 15 and a pin.
A structure in which a plurality of sets of basic link sets A ₁ , A ₂ ... Of a three-dimensional multi-plane linkage mechanism, which intersect each other by P ₁ and are connected in a frame-like manner so as to be interlocked, are continuously combined. Becomes In order to make the frame 10 movable, wheels w (see FIG. 5 (A)) are provided on the lower surface of the frame 10, for example, on the lower ends of the lower connecting members 15. Of course, one wheel w may be provided on each of the left and right sides on the lower surface of the lower connecting member 15 at only the front and rear ends of the frame 10 depending on the size and load of the frame 10.

The panel set 20 includes a plurality of panels 21,
Each panel 2 is composed of 22, 23 ...
₁ , ₂ , 22, 23 ... Each of the link sets A ₁ , A ₂ ... Or one set of link sets A ₁ , A ₃ ... of the entire frame 10 or a part thereof by bolts / rivets or welding means. In the case of the embodiment shown in FIG. 1, for example, in the case of the link member located outside the X-shaped vertical links 1 and 12, which are outside the X-shaped vertical links 1a and 1a on the opposite sides, the links 11 and 12 present a cross shape (that is, a shape that is not parallel). , Is mounted on the lateral link 13 located outside the upper X-shaped lateral link 1b.

The panels 21, 22, and 23 are designed in various shapes according to the shape of the concrete structure for lining work such as tunnels. The tunnel structure shown in this embodiment has a horseshoe shape. Panel 21,
22 and 23 are in a state in which the horseshoe shape is divided into three substantially equal parts, in other words, the frame 10 is the link set A ₁ , A _2.
.. are gathered together to form the expanded and contracted state shown in FIGS. 2 and 4, the panels 21, 22, and 23 of each link set A ₁ , A _2, ... It is shaped to form a horseshoe-shaped tunnel. With such a structure, concrete can be used as a lining for placing between the mold and the inner wall of the excavated tunnel or the like.

In this embodiment, the panels 21, 22, 23 are
Are arc-shaped plate portions 21a, 22a, 23a serving as templates, and extend from one ends of these arc-shaped plate portions 21a, 22a, 23a toward the corresponding links 11, 12, 13 and, as described above, bolts. Link 1 each with rivets or welding
1, 12 and mounting plate portion 21 fixed on the link 13
b, 22b, 23b, and panel 21 and panel 2
2 are located on both sides of the panel 23 and are formed symmetrically.

Further, blocking plates 21c, 22c and 23c for blocking the outflow of concrete are provided on the frontmost and / or rearmost panels 21, 22 and 23 of the panel set 20.
Is provided so as to extend outward from the arc-shaped plate portions 21a, 22a, 23a, and at least one of the blocking plate portions, for example, 23c, has an injection hole 2 for injecting concrete.
At least one 5 is provided.

A horseshoe-shaped panel set 20 is constructed by combining a large number of these panels 21, 22, 23. The mounting plate portions 21b, 22b, and 23b have their lower end portions formed straight so that the corresponding links 11 and 1 are provided.
It is attached to the outer surface of each of the links 11, 12, and 13 by forming it on the side surface of the link 2, 13 or by forming it into an L shape.

In order to convert the panel set 20 according to the sectional shape of the tunnel or the like, the panels 21, 2 are converted.
It is better to use bolts and nuts 2 and 23 configured to be attached to the links 11, 12, and 13.
Further, both ends of the mounting plate portions 21b, 22b, and 23b have arcuate plate portions 21a, 22a, and 23, as shown by a chain line in FIG.
It may be configured so as to be retracted slightly inward from both ends of a. The panels 21, 22, and 23 thus constructed are integrated with the links 11, 12, and 13 and interlock with the link sets A ₁ , A _2, ... Of the frame 10.

The frame 10 and panel set 20
To mold and demold, that is, panels 21, 22,
Link set A ₁ fitted with 23, A ₂ and ... is driven so that the entire thereof is contracted diameter and elongation reduced diameter, most other party of the right and left sides or any one side of the link set A ₁ of the frame 10 or above, it was outside or beneath both surfaces or any one surface of the inner telescopic drive 30, such as a vertical (up and down) or horizontally (left and right) cylinder or electric screw rod which expands and contracts in the direction are provided .

In this embodiment, the driving device 30 uses a pair of fluid pressure cylinders, and the upper and lower ends of the cylinder or the driving device 30 are vertically connected to the upper end of the link 11 by a pin P ₁ or a shaft. It is attached to the connecting members 15, 15 with the lower end of the link 12. In this case, the connecting member 15 may be left as it is, but may be formed in another shape convenient for mounting the cylinder 30.

A separately designed drive device mounting member (not shown) is used as the connecting member 15 or the corresponding link 1.
Alternatively, the cylinder 30 may be attached to the drive device attaching member by fixing the cylinder 30 at appropriate positions. Further, although the cylinder 30 is vertically attached to the outside of the frame 10 in this embodiment, it may be attached to the inside thereof. Further, as shown by the chain line in FIG. 4, the cylinder 30 may be mounted on the upper and lower surfaces of the frame 10 or inside or outside of any one of them.

In order to perform the stable and balanced operation of the formwork structure constructed as described above, it is preferable to use a pair of cylinders 30 that act in synchronization. When the formwork structure is heavy and large, a pair of cylinders 30 may be used at the front and rear ends of the frame 10. However, in some cases it may be light and small, or in other applications it may be sufficient to use only one cylinder 30.

When the cylinder 30 is used as a driving device, the cylinder 30 is connected to a fluid pressure source such as a pump or a compressor via a flexible hose. The fluid pressure source may be a separate device provided separately from the frame 10, or a device mounted on an appropriate place inside the frame and integrated with the frame 10. In the former case, remote control is possible.

Next, an example of the construction method of the present invention constructed as described above will be described with reference to FIGS. First, while the formwork structure is being expanded and contracted (described in detail later), the formwork structure is allowed to self-propell to the planned lining section inside the excavated tunnel 40 (see FIG. 4) (see FIG. 5A). Then one end of the frame 10, for example one end x on the back side of the tunnel
The wheels w are fixed and the telescopic drive device, that is, the cylinder 3
When 0 is operated in the direction in which the piston rod extends by the fluid pressure sent from the fluid pressure source, the link 1
₁ , 12, 13, 14 rotate about the pin P _{1 so} that the crossing angle θ of the X-shaped links 1a, 1b becomes gradually smaller, and the outer end y of the frame 10 is directed toward the x end, that is, the link set. A ₁ , A _2, ... Are interlocked with each other to move closer to the link set An, and the axial length of the frame 10 is shortened, and the height and the outer diameter of the frame 10 in the width direction are expanded. And at the same time panels 21, 22, 2
3 gather together to form an initial cylindrical mold 20 as shown in FIGS. 5 (b) and 2.

After the mold is molded, the concrete 41 is driven into this mold, that is, the space formed between the panel set 20 and the excavation wall of the tunnel 40, and after the concrete 41 is initially hardened, the Y end of the frame 10 is fixed. Then, when the X end is released to a free state and the cylinder 30 is operated in the direction in which the piston rod contracts by the fluid pressure in the opposite direction to the above, the crossing angle θ of the X-shaped links 1a and 1b gradually increases. The link sets A ₁ , A _2, ... Are interlocked with each other to reduce the diameter of the frame 10 and extend the length x
At the same time as the end advances further into the tunnel, the panels 21, 22 and 23 of the panel set 20 are separated from each other while being removed from the wall surface of the concrete 41 in accordance with the operation of the link, and the cylinder 30 is separated. When is contracted to a predetermined length, the frame 10 is in the state shown in FIG. 5 (C). As a result, panel set 20 can be performed with one action.
Can be easily demolded from the concrete 41 wall surface.

After that, by fixing the X end of the frame 10 and releasing the Y end and then extending the cylinder 30, the Y end of the frame 10 is moved toward the X end in the same manner as described above. At the same time, panel 2
1, 2, and 23 are gathered together to form a tubular mold 20 as shown in FIG. 5 (D), which can be used for concrete placing work in the next section.

As described above, the formwork structure of the present invention can be expanded and contracted as if it were a waste due to the expansion and contraction deformation action of the expansion and contraction drive device 30 of the frame 10. FIG. 6 is a schematic view showing another embodiment of the present invention. Further, although the end surface of the frame 10 has a rectangular shape or a substantially square shape in the above embodiment, it may be formed in a trapezoidal shape as shown in FIG.

Although the assembled mold is horseshoe-shaped in the above embodiment, it may be assembled in a circular mold. In this case, the lower horizontal link 1 as shown in FIG.
Panels 23, 21, 2 attached to the upper horizontal link 1b and the vertical links 1a, 1a on both sides are attached to the outer links of b.
A panel 24 having a combination of circular shapes corresponding to 2 is attached, and supporting legs 5 extending downward are provided at lower portions of both front and rear ends of the frame 10.

FIG. 9 is an explanatory diagram in which the formwork structure of the present invention is used for concrete pouring work for a drainage ditch. in this case,
The construction state is opposite to that of the tunnel. Of course,
In this case, it is not necessary to provide the wheel w on the frame 10.

In the formwork structure of the present invention, the frame 10
Since the outside diameter or cross section becomes smaller when the is stretched, and the outside diameter or cross section becomes larger when the is stretched, when using two formwork structures alternately, mold and cast concrete first. While the set mold is waiting for the initial hardening of concrete, the rear mold can go under the inside of the former mold and proceed with the mold molding and concrete placing work in the back,
The completion period can be shortened.

[0034]

According to the present invention having the above-described structure, the formwork structure is a link mechanism which is mounted on itself by a telescopic drive device.
It is possible to move forward and backward while expanding and contracting via the machine, and with the same device the panel can be molded into a predetermined mold suitable for concrete pouring with one action, and after pouring concrete, the mold can be concrete with the same one action. It can be released from the wall surface, further, since each panel is configured to be replaceable, by selecting using a panel to accommodate the cross-sectional shape such as tunnel sewer sectional shape without changing the frame It can be applied to various constructions such as different tunnels, sewers, drains, etc. and other uses. Besides, each member can be used repeatedly, its structure is simple and common and interchangeable. Link sets and panel sets can be added or removed at will, and after molding the mold, the inner space is used to It is possible to continue the excavation and shearing work of the section, and it is also possible to work alternately using two formwork structures, so the construction efficiency is extremely high and the completion period can be significantly shortened. In addition, the tunnel or the like to be constructed is not limited to a straight line, but may be slightly curved, and there is an effect that the operation and handling of the formwork are easy.

[Brief description of drawings]

FIG. 1 is a partially exploded and perspective view showing a semi-expanded state of an embodiment of a mold structure of the present invention.

FIG. 2 is a partially omitted perspective view showing a state in which the formwork structure of the present invention has expanded and contracted, that is, a molded state.

FIG. 3 is an explanatory view showing an embodiment of a pivotally connecting portion of the formwork structure of the present invention.

FIG. 4 is a front view of the formwork structure of the present invention.

5 (A) to 5 (D) are schematic views for explaining a construction method in which the present invention is used for concrete placing work in a tunnel.

FIG. 6 is a schematic plan view showing another embodiment of the present invention.

FIG. 7 is an end view showing still another embodiment of the present invention.

FIG. 8 is an end view showing still another embodiment of the present invention.

FIG. 9 is an explanatory diagram showing a state in which the present invention is used for drainage construction.

[Explanation of symbols]

10 frames A ₁ , A ₂ ... An link set 1a X-type vertical link 1b X-type horizontal link 11,12 Vertical link 13,14 Horizontal link 15 Connecting member 20 Panel set (type) 21, 22, 23, 24 panels 30 Telescopic drive device (cylinder) 40 Tunnel

Claims (6)

[Claims] 1. A plurality of X-shaped links (1a, 1b) pivotally connected to intersect with each other in an X-shape are interlocked in such a manner as to extend and contract on a three-dimensional multi-plane of width, height, and length. An expandable and contractible frame (10) composed of at least one set of X-type link sets (A ₁ , A ₂ ...) And on at least one plane of the outer peripheral surface of at least a part of the frame (10). Attached to the link, link set (A ₁ , A ₂ ·
.. A panel set (20) composed of a plurality of panels (21, 22 ...) For assembling / disassembling and demolding a predetermined mold all at once by the expansion / contraction motion of the frame (10) by interlocking the frame, and the frame. It is attached so as to be capable of extending and contracting vertically or horizontally between X-shaped links at arbitrary points of (10), and the frame (10) is extended, deformed and moved via the link set (A ₁ , A ₂ ...). A self-propelled formwork structure composed of a telescopic drive device (30). 2. An X-shaped link set (A ₁ , A _2, ...) Forming a frame by connecting frames (10) so as to interlock with each other on at least one set of three-dimensional multi-planes.
.), And each link set (A ₁ , A ₂ ...
) Is a pair of X-shaped vertical links (1a, 1a) symmetrically arranged on both sides of the mold, and a pair of X-shaped horizontal links (1b) symmetrically arranged on the upper and lower sides of the mold. , 1b) and a linking member (15, 1b) for linking these links (1a, 1a, 1b, 1b) rotatably in a frame on the corresponding planes.
15. The self-propelled formwork structure according to claim 1, comprising 3. The link set (A ₁ , A ₂ ...) Of the frame (10) such that the panel set (20) is replaceable.
・) Or every other link set (A ₁ ,
A _3, A _5, ...) is composed of a plurality of panels (21, 22, ...) which best mounted on some links on the outside of,
Claim the frame (10) is molded in a mold of a predetermined shape when deflated diameter, frame (10) is characterized by being configured such that the respective partial <br/> apart panels when stretched diameter 1 self-propelled formwork structure. 4. A frame (10) lower end to the frame (10) across the support to move easily as plurality claim provided car wheel <br/> of 1 or 2 self-propelled formwork structures body. 5. An X-type link set (A ₁ , A ₂ ...)
A frame (10) that is expandable and contractible and is formed by connecting a large number of sets so that they can interlock in a three-dimensional multi-plane.
A plurality of panels (21, 22 ...) Attached to links on at least one plane of at least part of the outer peripheral surface of the
A panel structure (20) composed of the above and a telescopic drive device (30) mounted between arbitrary X-shaped links of the frame (10) to drive the frame (10) in a telescopically deformable manner. After moving to a construction site such as a tunnel or sewer and fixing one end, expand and contract the frame (10) by expanding and contracting the expansion and contraction driving device (30) to concrete-cover the panels (21, 22 ...). Molded into a mold or panel set (20) with a predetermined shape suitable for the concrete, and concrete is driven into the space between this mold (20) and the earth wall of the tunnel, sewer, etc. After the concrete hardens, the expansion and contraction drive device (30) expands and contracts. And frame (1
Panel set (2
0) is removed from the concrete wall while being displaced and deformed together with the deformation of the frame (10), and at the same time, the panels (21, 22 ...) With staggered division are formed, and then the frame (10) is formed. ), The other end is fixed, and the one end that was originally fixed is released.
By the expansion and contraction operation of 0), the frame (10) is moved forward toward the fixed end, and at the same time, the panel set (20) is molded again into a predetermined shape by shrinking and expanding the diameter, and concrete placing work of the next section. Formwork construction method that was carried out. 6. A mold structure comprising two or more mold structures, one of which is expanded and shrunk to mold a mold, and the concrete is poured into the mold, and then the other one of them is awaiting initial curing of the concrete. The mold according to claim 5, wherein the base is made to go under the inside of the waiting frame (10) and is moved to the inner part of the construction section so that the mold assembling molding and concrete placing work of the next section are advanced. Construction method.