JP6543941B2 - Slip foam apparatus and method for constructing tubular wall - Google Patents

Description

  The present invention relates to a slip foam device and a method of constructing a tubular wall.

  Conventionally, when constructing a container structure requiring airtightness, such as a grain storage silo, a dangerous material storage facility, or an LNG tank, with a cylindrical wall made of reinforced concrete, the inner circumferential surface of the cylindrical wall should be used. By lining with an airtight material such as a metal plate, leakage of the contained material is prevented.

  As a method of constructing a cylindrical wall in which such an inner circumferential surface is lined with an airtight material, for example, in Patent Document 1, the airtight material is assembled in advance as an inner mold frame of the wall, and the airtight material is assembled. There is disclosed a method of placing a concrete between an outer frame assembled on the outer periphery thereof and constructing a cylindrical wall. Specifically, the outer frame is fixed to the airtight material using a spacing material, concrete is placed between the two and hardened, and then the process of removing only the outer frame is directed vertically upward It is a method of repeating concrete repeatedly.

  The above method can significantly shorten the construction period because the inner peripheral surface is lined with the airtight material used as the inner mold simultaneously with the construction of the cylindrical wall. However, it is necessary to use a spacer for setting the outer frame, and the removal and attachment of the outer frame is repeated each time concrete is directed upward, which makes the operation complicated. It is conceivable to apply the slip foam method, which is used when constructing a reinforced concrete tower-like structure, to a formwork of such an outer form.

  As disclosed in, for example, Patent Document 2, the slip form construction method uses a rod embedded in the concrete as a reaction force while placing concrete between a ring-shaped inner form and an outer form. This is a construction method in which the inner form and the outer form are continuously raised by a hydraulic jack to construct a tower structure.

JP, 2010-106501, A JP 10-54136 A

  In general, in the slip foam apparatus, a yoke having a portal frame is disposed so as to straddle the wall of the tower structure to be constructed, and the plate form is used for the inner wall and the outer wall of the tower structure. The yoke, the inner plate-like form and the outer plate-like form are integrally fixed. Then, a plurality of these yokes are adjacent to each other to connect the plate-like molds, thereby forming the ring-like inner mold and the outer mold. Thereby, the side pressure generated at the time of concrete placement acts on both the ring-shaped inner mold frame and the outer mold frame and is offset, so that it does not move in the horizontal direction, and its shape in plan view is maintained It is.

  However, when the slip foam apparatus is applied only to the formwork of the outer mold in the method of constructing the cylindrical wall described above, it is natural that the yoke straddling the cylindrical wall has a plate shape only on the outer side of the wall. The formwork will be placed. Then, since the side pressure generated by placing concrete acts as an internal pressure on the ring-shaped outer form frame formed by connecting the plate-like form frames, the plan view shape of the ring-shaped outer form frame is elliptical It is easy to be deformed such as to have an oval shape, and it becomes difficult to maintain the shape of the ring-like outer form in plan view, and a predetermined wall thickness can not be secured.

  In order to cope with such behavior, for example, the rigidity of the yoke is increased, or the same ring-shaped reinforcing material is installed on the back of the ring-shaped outer frame to maintain the shape retention performance of the ring-shaped outer frame. There is also a way to enhance it.

  However, in any of the methods, the weight of the entire slip foam apparatus increases, and assembly and disassembly become complicated. In addition, in the case where a ring-shaped reinforcing material is provided, it is not possible to correct the plan view shape when the diameter of the sectional view of the cylindrical wall is to be gradually expanded or reduced in the height direction. It is inferior to sex. Furthermore, by moving the entire slip form apparatus in the planar direction, it is not possible to prevent the event that the predetermined wall thickness can not be maintained.

  The present invention has been made in view of such problems, and its main object is to construct a cylindrical wall whose inner peripheral surface is lined with a cylindrical member with high workability and high accuracy. It is an object of the present invention to provide a slip foam apparatus having only a ring-shaped outer frame positioned on the outer peripheral surface of a cylindrical wall and a method of constructing a cylindrical wall using the slip foam apparatus.

In order to achieve the above object, the slip foam device of the present invention is a slip foam device for constructing a cylindrical wall whose inner peripheral surface is lined with a cylindrical member, wherein An outer form panel disposed so as to face each other on a casting surface, a longitudinal member installed on the back of the outer form panel, and a reinforcement frame installed on the rear side of the outer form panel with the longitudinal member interposed therebetween And a raising / lowering means for raising and lowering the yoke, and engaging with an engaging portion provided on the outer peripheral surface of the cylindrical member and provided on the yoke to move the yoke horizontally while freely raising and lowering the yoke And a plurality of horizontal movement regulating members are arranged at intervals in the circumferential direction of the cylindrical member, and the yoke is provided in each of the horizontal movement regulating members. Installed, The outer formwork panel and the reinforcing Frames with the click are each, are concatenated to form an outer tubular formwork and links Frames in a circumferential direction of the tubular member, lower working stage, on the upper surface of the reinforcing Frames It is characterized by being provided .

  According to the present invention, the ring-shaped outer cylindrical mold formed by connecting the outer mold panels provided to the yoke is lifted along the horizontal movement restricting member while maintaining the shape in plan view. It becomes possible. Further, in the ring-shaped outer cylindrical formwork, the outer form panel forming the outer cylindrical formwork passes through the yoke even when the side pressure generated by placing concrete acts as the inner pressure. Since it does not move in the horizontal direction because it is engaged with the horizontal movement restricting member, a predetermined wall thickness can be secured, and the shape in plan view is not deformed into an oval or an oval. Therefore, it becomes possible to improve the holding property of the planar view shape in a ring-shaped outer side cylindrical formwork, and it becomes possible to ensure high construction accuracy in a cylindrical wall.

  Also, even if seismic force or wind load is applied, the yoke is engaged with the horizontal movement restricting member, so that the entire slip form device moves or rotates horizontally in response to these external forces. Can be suppressed.

Furthermore, in order to bear also the side pressure at the time of concrete casting acting on the outer form panel by the reinforcing frame and to suppress the deformation of the outer form panel itself, in the ring-shaped outer cylindrical form consisting of the outer form panel It is possible to further suppress the deformation of the plan view shape. In addition, when adjacent reinforcing frames are connected to form a ring frame, the ring frame exerts a restraining effect on the outer cylindrical form, so it can withstand even higher internal pressure generated in the outer cylindrical form. It becomes. Therefore, for example, it is also possible to increase the placement height of concrete to be placed at one time.

The slip form apparatus according to the present invention is characterized in that an upper work stage is provided at the top end of the yoke and on the opposite side of the outer form panel with the longitudinal member interposed therebetween.

  In the method for constructing a cylindrical wall according to the present invention, after the tubular member and the horizontal movement restricting member are assembled in advance, the outer tubular mold provided with the yoke is spaced from the outer peripheral surface of the tubular member. It arranges so that it may face each other, and it is made to concrete between the said cylindrical material and the said outer side cylindrical form, making it raise continuously through the said raising / lowering means in the state which made the said yoke engage with this horizontal movement control member. It is characterized in that

  According to the present invention, the slip foam device is adopted for the outer mold while using the cylindrical material as the inner mold. As a result, it is possible to save time for installing and removing the molds for both the inner and outer molds, and there is no need to provide a work stage inside the cylindrical wall to be constructed, thus saving labor for the entire construction. And it becomes possible to achieve cost saving.

  In the present invention, when constructing a cylindrical wall lined with a cylindrical member on the inner side, the cylindrical member is used as an inner mold and the outer molding frame is formed by a slip foam device, so that the inner molding and outer mold It becomes possible to construct a cylindrical wall body with high workability and with high accuracy, while largely omitting the work process relating to the formwork in both frames.

It is a top view of a slip form apparatus. It is a side view of a slip form apparatus. It is a figure which shows the detail of the horizontal member which comprises a yoke. It is a figure which shows the construction method of the cylindrical wall body using a slip foam apparatus (the 1). It is a figure which shows the construction method of the cylindrical wall body using a slip foam apparatus (the 2). It is a figure which shows the other example of the cylindrical wall which used the slip foam apparatus.

<Structure of slip form device>
In the following, the slip foam device according to the invention is described in more detail below with reference to FIGS. 1 to 3.

  The slip form apparatus 1 of the present invention is an apparatus for constructing a cylindrical wall body 11 of a reinforced concrete structure in which the inner peripheral surface is lined with a cylindrical member 12 as shown in the plan view of FIG. In order to use the cylindrical member 12 as the inner mold when casting C, the mold has a configuration including only the outer cylindrical mold 6 functioning as an outer mold.

  In addition, as long as the cylindrical material 12 lines the inner peripheral surface of the cylindrical wall body made of reinforced concrete, it may be formed of any material such as airtight material, water-tight material, steel material, FRP, and the like.

  Specifically, as shown in the plan view of FIG. 1 and the side view of FIG. 2, the yoke 3 provided with the outer formwork panel 2, the lifting means 4 for lifting and lowering the yoke 3, and the horizontal engagement with the yoke 3 The movement restricting member 5 is provided.

  As shown in FIG. 2, the outer form panel 2 is disposed so that the placement surface faces the cylindrical member 12, and the placement surface is formed parallel to the outer circumferential surface of the cylindrical member 12. It is done. These outer formwork panels 2 are supported by the yoke 3 and arranged at an interval to the cylindrical member 12.

  The yoke 3 is a frame constituted by a longitudinal member 31 installed on the back of the outer form panel 2 and a horizontal member 32 fixed in a cantilevered manner to the longitudinal member 31. The horizontal member 32 is fixed to extend above the outer form panel 2 with respect to the vertical member 31 and to extend in a direction perpendicular to the casting surface of the outer form panel 2 as shown in FIG. Be done. As shown in FIG. 3, the raising / lowering means 4 and the engaging tool 321 are respectively installed on the horizontal members 32. Further, a reinforcing frame 311 is installed on the vertical member 31.

  As shown in FIG. 2, the elevating means 4 is composed of a climbing jack 41 fixed to the horizontal member 32, and a rod 42 penetrating the climbing jack 41. The rod 42 is composed of the cylindrical member 12 and the outer mold It is arranged vertically between the panel 2 and the other. Thus, the yoke 3 ascends while rolling the rod 42 at the climbing jack 41.

  The engaging member 321 is provided at the tip of the horizontal member 32, and as shown in the plan view of FIG. 3, by engaging the horizontal movement restricting member 5 described later so as to be held from the side, the yoke The horizontal movement of the yoke 3 when an external force is applied in the horizontal direction is restricted while freely moving up and down 3.

  In the present embodiment, two engaging members 321 are installed in the height direction, but the number of the vertical members 31 of the yoke 3 can be held parallel to the horizontal movement restricting member 5 at least at normal times. May be set to any.

  The reinforcing frame 311 is disposed on the back side of the outer form panel 2 and installed on the vertical member 31 as shown in FIG. 2, and as shown in FIG. It is comprised by the cylindrical three-dimensional truss formed so that it might follow. These function as uplifting of the outer formwork panel 2, and when the concrete C is placed and lateral pressure is applied to the placement surface of the outer formwork panel 2, the lateral form pressure is applied to the outer formwork panel 2 suppresses the deformation in the horizontal direction.

  The horizontal movement restricting member 5 is installed on the outer peripheral surface of the cylindrical member 12 and vertically erected as shown in FIG. 2, and as shown in FIG. There are a plurality of intervals of about 4 m. The yoke 3 is engaged with each of the plurality of horizontal movement restricting members 5.

  Thereby, the yoke 3 engaged with each horizontal movement restricting member 5 is provided on the yoke 3 as it is adjacent to the circumferential direction of the cylindrical member 12 as shown in the plan view of FIG. The panel 2 is also connected in the circumferential direction of the cylindrical member 12 to form the outer cylindrical mold 6. At this time, the adjacent yokes 3 are connected via the outer ring member 33, as shown in FIG.

  In addition, since the horizontal movement control member 5 is installed in the outer peripheral surface of the cylinder 12, it can be functioned as a side pressure bearing member which bears the side pressure at the time of the concrete placement which acts on the cylinder 12. In addition, when making it function also as a side pressure bearing member, taking into consideration the material of the side pressure cylindrical member 12, the thickness of the member, etc., the lateral movement regulating member 5 adjacent to the side pressure does not cause an overhang due to the side pressure at the time of pouring concrete. It should be arranged with a certain distance.

  As shown in FIG. 1, the slip form apparatus 1 having the above-described configuration is disposed such that the outer cylindrical form 6 encloses the cylindrical member 12. Therefore, the arrangement interval between the outer cylindrical mold 6 and the cylinder 12 is set to the same size as the wall thickness of the cylindrical wall 11 to be constructed, and the cylinder 12 is used as the inner mold and the outer cylindrical mold. Concrete C is placed between the two with the frame 6 as the outer frame. At this time, the cylindrical wall body 11 in which the cylindrical member 12 is lined on the inner peripheral surface is constructed by placing concrete C while raising the outer cylindrical formwork 6 continuously via the yoke 3. It can be done.

  Thereby, the ring-shaped outer cylindrical formwork 6 formed by connecting the outer formwork panels 2 can rise along the horizontal movement restricting member 5 while maintaining the shape and position in plan view. Further, in the ring-shaped outer cylindrical formwork 6, the outer formwork panel 2 constituting the outer cylindrical formwork 6 is also when the side pressure generated by placing concrete C acts as an internal pressure, Since it does not move in the horizontal direction because it is engaged with the horizontal movement restricting member 5 via the yoke 3, the shape in plan view does not deform into an oval or an oval. Therefore, it becomes possible to improve the holding property of the planar view shape and position in the ring-shaped outer side cylindrical formwork 6, and it becomes possible to ensure high construction accuracy in the cylindrical wall 12.

  Also, even if seismic force or wind load is applied, the yoke 3 is engaged with the horizontal movement restricting member 5, so the entire slip form apparatus 1 moves or rotates in the horizontal direction under these external forces. Does not produce such behavior. Therefore, as described later, as shown in FIG. 5, even if the reinforcing bar 13 and a sheath tube or embedded metal (not shown) are installed inside the cylindrical wall 12, the yoke 3 moves or rotates and interferes with these. Interaction can be suppressed, and the workability can be improved.

  In the slip form apparatus 1, as shown in FIG. 2, the lower work stage 7A is provided on the upper surface of the reinforcing frame 311, and the outer mold is a top end of the yoke 3 and sandwiching the vertical member 31. An upper work stage 7B is also provided on the opposite side of the panel 2. By providing the lower work stage 7A and the upper work stage 7B on the opposite side of the vertical frame 31 to the outer formwork panel 2, lateral pressure acts on the outer formwork panel 2 when concrete C is cast. Thus, the yoke 3 is prevented from rotating in the vertical direction.

  Further, the reinforcing frames 311 arranged adjacent to each other in the direction along the cylindrical member 12 are connected to form a ring frame 8 so as to surround the outer cylindrical form 6 as shown in FIG. . Then, since the ring frame 8 exerts a restraining action on the outer cylindrical form 6, the plan view shape which is easily generated by the internal pressure acting on the ring-shaped outer cylindrical form 6 when concrete C is cast. In combination with the horizontal movement restricting member 5, it is possible to further suppress the deformation of.

<Method of Constructing a Cylindrical Wall Using a Slip Foam Device>
Below, the construction method of the cylindrical wall body 11 using the slip foam apparatus 1 mentioned above is explained in full detail with reference to FIGS. 4-6.

  In this embodiment, as shown in FIG. 4A, the case of constructing a PC liquid barrier provided in the LNG tank T constructed on the ground is taken as an example. The PC liquid-repellent dike is a reinforced concrete cylindrical wall body 11 whose inner circumferential surface is lined with an airtight cylindrical member 12 called an outer tank liner.

  As shown in FIG. 4 (b), the cylindrical member 12 and the horizontal movement restricting member 5 are assembled on the base plate of the LNG tank T in advance, and the rod 42 and the reinforcing bar 13 are built.

  In the present embodiment, when the cylindrical member 12 and the horizontal movement restricting member 5 are assembled in advance, both are fixed by welding, but the present invention is not necessarily limited thereto, and means for maintaining airtightness in the cylindrical member 12 As long as it is, you may fix both by any fixing means.

  Further, in the present embodiment, the stud 121 is provided on the back surface of the cylindrical member 12 as shown in FIG. 1 in order to improve the fixability with the concrete C, but the adhesion between the cylindrical member 12 and the concrete C is The shape may be any as long as

  Next, as shown to Fig.5 (a), the outer side cylindrical formwork 6 provided with the yoke 3 is arrange | positioned on the basic version of LNG tank T, and concrete C which comprises the cylindrical wall body 11 is set. .

  Specifically, as shown in FIG. 2, the engaging portion 321 of the yoke 3 is engaged with the horizontal movement restricting member 5, and the climbing jack 41 is inserted through the rod 42. And as shown to Fig.5 (a), the outer side cylindrical form form which the outer side form panel 2 arranged by the space | interval of the same magnitude | size as the wall thickness of the cylindrical wall 11 which it is going to construct is joined. Concrete C is placed between 6 and the cylindrical member 12, and the lower ends of the rod 42 and the reinforcing bars 13 are embedded in the concrete C.

  Hardening of the cast concrete C proceeds, and when the rod 4 is firmly supported, the climbing jack 41 is driven to start raising the outer cylindrical form 6 via the yoke 3. In addition, the rising speed of the outer side cylindrical form 6 can stand by while the cast concrete C is exposed from the lower end of the outer side cylindrical form 6 by the slide ascent of the outer side cylindrical form 6 Consider and set time to ensure a certain level of strength.

  After raising of the outer cylindrical formwork 6 is started, the following operation is performed using the upper operation stage 7B and the lower operation stage 7A.

  As shown in FIG. 5 (b), the rod 42 and the reinforcing bar 13 are added together with the rise of the outer cylindrical mold frame 6, and the assembly of the sheath tube embedded in the cylinder wall 11 or embedded metal (not shown) Work on the installation of In parallel with these operations, an operation of placing concrete C between the outer cylindrical formwork 6 and the cylindrical member 12 and an operation of compacting the placed concrete C are performed.

  These operations are repeated at the same time while raising the outer cylindrical formwork 6 continuously, and concrete C is launched upward from below as shown in FIG. 5 (c). As a matter of course, both the horizontal movement restricting member 5 and the rod 42 are embedded in the concrete C.

  In the above procedure, the yoke 3 is engaged with the horizontal movement restricting member 5 and the concrete C is raised to a desired height while continuously rising vertically while holding the shape and position of the outer cylindrical form 6 in plan view. The cylindrical wall body 11 whose inner peripheral surface is lined with the cylindrical member 12 is accurately built by placing the

  According to the construction method of the cylindrical wall body 12 using the slip foam device 1, the cylindrical member 12 is used as the inner mold, and the outer cylindrical mold 6 of the slip foam device 1 is used as the outer mold Since it uses and installs, the effort of installation of both the inner form and the outer form necessary for constructing | assembling the cylindrical wall body 11 and mold removal can be abbreviate | omitted.

  Further, the work relating to the installation of the inner wall reinforcements of the cylindrical wall body 11, the sheath tube, and the embedded hardware can be performed using the lower work stage 7A and the upper work stage 7B provided in the slip form apparatus 1. Therefore, it is not necessary to provide a scaffold inside the cylindrical wall 11. Furthermore, since the horizontal movement restricting member 5 is disposed on the outer peripheral surface of the cylindrical member 12 and is embedded in the cylindrical wall body 11, there is no need to disassemble and remove it.

  Thus, it becomes possible to achieve labor saving and cost saving of the entire construction relating to the construction of the cylindrical wall body 12.

  The construction method of the slip foam device 1 and the cylindrical wall body 11 of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, in the present embodiment, although the PC liquid-repellent dike is adopted for the cylindrical wall body 11, it is not necessarily limited to this, for example, silos for grain storage, dangerous goods enclosure containers such as radioactive substances, etc. As long as it is the cylindrical wall body 11 whose inner peripheral surface is lined with the cylinder member 12 such as a wall body, it is also possible to apply to any, and the cross-sectional shape is not necessarily limited to a cylinder, For example, a square tube may be used.

  Further, in the present embodiment, although the cylindrical member 12 and the horizontal movement restricting member 5 are assembled in advance to the top end of the cylindrical wall 11 to be constructed, it is not necessarily limited to this. For example, the cylindrical member 12 and the horizontal movement restricting member 5 may be divided in the height direction, and the cylindrical member 12 and the horizontal movement restricting member 5 may be joined together with the joining of the rod 42 and the reinforcing bar 13. Also in this case, since the joining operation of the cylindrical member 12 and the horizontal movement restricting member 5 can be performed using the upper work stage 7B installed above the yoke 3, the inner peripheral surface side of the cylindrical wall 11 There is no need to set a foothold.

  Furthermore, as shown in FIG. 6, when the cylindrical member 12 is formed by welding a plurality of airtight plate members 121 in the longitudinal direction and the lateral direction, for example, the horizontal movement regulating member 5 is formed of the airtight plate member 121. It may be used as a positioning means in the lateral direction and a backing material, and welding between adjacent airtight plates 121 may be performed via the horizontal movement restricting member 5.

  In addition, as shown in FIG. 6, cross beams 14 may be provided to connect adjacent horizontal movement restricting members 5, and these cross beams 14 and the tubular member 12 may be welded. In this case, the cross beam 14 functions as a means for preventing the protrusion of the cylindrical member 12 at the time of placing the concrete C and a means for enhancing the adhesion with the concrete C.

DESCRIPTION OF SYMBOLS 1 slip form apparatus 2 outer side formwork panel 21 pin bearing 22 jack 3 yoke 31 vertical member 311 reinforcing frame 32 horizontal member 321 engaging tool 33 outer ring member 4 lifting means 41 climbing jack 42 rod 5 horizontal movement regulating member 6 outer cylindrical shape Formwork 7A Lower work stage 7B Upper work stage 8 Ring structure 11 Cylindrical wall (PC liquid break)
12 cylinder 13 rebar 14 cross beam C concrete T LNG tank

Claims (3)

A slip foam device for constructing a cylindrical wall whose inner peripheral surface is lined with a cylindrical member,
An outer form panel disposed so as to face a casting surface to an outer peripheral surface of the cylindrical member, a longitudinal member installed on the back of the outer form panel, and the outer form panel with the longitudinal member interposed therebetween A yoke having a reinforcing frame installed on the back side ,
Raising and lowering means for raising and lowering the yoke;
And a horizontal movement restricting member which is installed on an outer peripheral surface of the cylindrical member and engaged with an engaging portion provided in the yoke to freely move the yoke up and down while restricting horizontal movement. ,
A plurality of the horizontal movement restricting members are arranged at intervals in the circumferential direction of the cylindrical member, and the yoke is installed on each of the horizontal movement restricting members,
The outer formwork panel and the reinforcing Frames with the said yoke are each, are connected to form an outer tubular formwork and links Frames in a circumferential direction of said tubular member,
A slip form apparatus characterized in that a lower work stage is provided on the upper surface of said reinforcing frame . In the slip foam device according to claim 1,
An upper work stage is provided on the upper end of the yoke and on the opposite side of the outer form panel with the longitudinal member interposed therebetween . A method of constructing a cylindrical wall using the slip foam device according to claim 1 or 2 ,
After the cylinder and the horizontal movement restricting member are assembled in advance,
The outer tubular mold provided with the yoke is disposed to face the outer peripheral surface of the tubular member with a gap,
Concrete is cast between the cylindrical member and the outer cylindrical form while raising continuously through the raising and lowering means in a state in which the yoke is engaged with the horizontal movement restricting member. How to construct a tubular wall to be.

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