JPH0587362B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a formwork for manufacturing a box culvert used for constructing waterways, etc. The box culvert has a flat top wall. This includes not only those with an arched top wall, but also those with an arched upper wall.

[Prior Art] A conventional box culvert manufacturing form disclosed in Japanese Patent Application Laid-open No. 59-204508 has a base plate between the lower ends of an outer frame and an inner frame whose longitudinal axes are arranged perpendicularly. The opening member is fitted and concrete is poured from the open part between the upper ends of the outer frame and the inner frame,
This outer frame consists of a main outer formwork that covers the top wall and left and right side walls of the box culvert, and a secondary outer formwork that extends between the ends of the main outer formwork and covers the bottom wall of the box culvert. It is configured.

The inner frame includes an upper wall inner form for forming the upper wall of the box culvert, a substantially L-shaped side wall inner form for forming all of the side wall and a part of the lower wall of the box culvert, and It consists of a lower wall inner formwork that forms the central main body of the lower wall. The left and right side wall inner formworks are rotatably supported around the ends near the upper wall inner formwork, and the lower wall inner formwork can be removed between the opposite ends of the side wall inner formwork. It has been inserted.

A screw rod is provided upright inside the inner frame along the longitudinal axis, and a movable cylinder that moves up and down by forward and reverse rotation of the screw rod is screwed into the screw rod. The outer end of each interlocking link is connected to the inner surface of the inner formwork of each side wall portion by a horizontal pivot, and the inner end of each interlocking link is connected to the left and right ears of the movable cylinder by a horizontal pivot.

In this box culvert manufacturing formwork, when the screw rod is rotated in the forward direction with the lower wall inner formwork removed, the left and right side wall inner formwork rotates inward, so that the side wall inner formwork and the upper wall inner formwork rotate inward. The main part of the inner frame made of formwork is shrunk inward. After hanging and installing the main part of this shrunk inner frame on the base,
When the screw rod is rotated in the opposite direction, the left and right side wall inner mold frames are rotated outward, and the main body portion of the inner frame is extended to the normal position. The lower wall inner form is suspended between the side wall inner forms in this stretched state, and the lower wall inner form is fixed to the sub-outer form. After this, the main outer formwork and secondary outer formwork are assembled, the inner frame and outer frame are fastened, and concrete is poured.

When demolding, release the connection between the inner frame and outer frame,
After removing the main outer formwork and the secondary outer formwork from the concrete product, remove the inner formwork of the lower wall. Thereafter, the screw rod is rotated in the normal direction to contract the side wall inner formwork inward, and the main part of the inner frame is taken out from the concrete product.

[Problems to be Solved by the Invention] However, in this box culvert manufacturing formwork, the lower wall inner formwork is completely separated from the main body of the inner frame, and it is difficult to assemble the formwork. In this case, the main part of the inner frame is suspended from the base, and the formwork inside the lower wall is suspended from the main part of the inner frame, which are separate hanging operations. In this method, it is necessary to suspend the lower wall inner formwork from the main part of the inner frame before extracting the main part of the inner frame from the concrete product, so the process is complicated and the work efficiency is not good.

In addition, when the left and right side wall inner formwork is rotated inward to contract the main part of the inner frame, and when the side wall inner formwork is turned outward to extend and return the main part of the inner frame to its normal position. In either case, it is necessary to rotate the screw rod many times to move the movable tube up and down along the screw rod, so the process of expanding and contracting the main part of the inner frame takes a considerable amount of time, reducing work efficiency. It's bad.

Therefore, an object of the present invention is that even in the contracted state in which the inner formwork of the lower wall part is detached from between the left and right side wall inner formworks, the lower wall inner formwork is connected and held to the main part of the inner frame, and all the constituent parts of the inner frame are integrated. Since it can be used as a hanging object, the process of assembling the formwork and demolding the product can be greatly simplified, and the operations of inward and outward rotation of the formwork inside the side wall can be performed easily. To provide a formwork for manufacturing a box culvert, which can efficiently perform formwork assembly and mold removal work including the expansion and contraction process of an inner frame because it can be done quickly.

[Means for Solving the Problems] The following description will be made using reference numerals in the attached drawings. The formwork for manufacturing box culverts of the present invention includes
The joint members 3 and 4 are fitted between the front and rear ends of an outer frame 1 and an inner frame 2, whose longitudinal axes are arranged horizontally, and concrete is poured from the upper open part 5 of the outer frame 1. 2 is an upper wall inner formwork 7 for forming the upper wall of the box culvert, and a mold approximately L for forming the entire side wall and part of the lower wall of the box culvert.
The box culvert is composed of side wall inner formworks 8 and 9 and a lower wall inner formwork 10 for forming the central main body part of the bottom wall of the box culvert.

The upper wall inner formwork 7 is on the lower side, and the lower wall inner formwork 1
The inner frame 2 is arranged upside down so that 0 is on the upper side, and the left and right side wall inner form frames 8 and 9 are supported rotatably around their respective lower ends, and the lower wall inner form 10 is attached to the side wall inner form frame 8. , 9 to prevent inward rotation of the inner formworks 8, 9 of each side wall. A fixed post 11 is vertically fixed to the center of the inner surface of the upper wall inner form 7, and a horizontally long frame 12 is fixed to the inner surface of the lower wall inner form 10.
A movable post 13 that can move up and down along the fixed post 11 is fixedly installed at the center of the lower surface of 2.

The outer ends of the interlocking links 14, 15 are connected to the inner formworks 8, 9 of the side walls by horizontal pivots 16, 17, and the inner ends of the interlocking links 14, 15 are connected to the horizontal pivots 18, 1.
9 to the left and right ends of the horizontally elongated frame body 12. The movable posts 13 A latching means 20 is provided for fixing the holder to the fixed post 11.

[Operation] When the movable post 13 is guided by the fixed post 11 and pulled up, the left and right side wall inner forms 8 and 9 are rotated outward around the lower end by the pushing drive of the interlocking links 14 and 15. , the main body portion of the inner frame 2 extends outward to its normal position.

When the movable post 13 reaches the rising end position, the lower wall inner formwork 10 is fitted between the left and right side wall inner formworks 8 and 9, and at this stage the movable post 13
is fixed to the fixing post 11 by the latching means 20, and the inner formwork 10 of the lower wall prevents inward rotation of the inner formworks 8, 9 of the side walls.

After fixing the inner frame 2 in the stretched state in this way, the inner frame 2 is suspended into the inner space of the fixed outer frame 1 using a suitable suspension means such as a forklift, and the inner frame 2 is suspended between the inner frame 2 and the outer frame 1. The inner frame 2 is fixed by appropriate means such as bolting while maintaining a predetermined concrete pouring interval.

With the necessary reinforcing bars placed between the inner frame 2 and the outer frame 1, and the joint members 3 and 4 fitted between the front and rear ends, concrete is poured from the upper open part 5 of the outer frame 1, After the concrete has hardened, the box culvert product 6 is demolded.

When demolding the inner frame 2, if necessary, with the lower wall inner form frame 10 slightly lifted by the lifting means, the fixation of the movable post 13 by the latching means 20 is released, and the movable post 13 is removed. The post 13 is lowered along the fixed post 11. In this process of descent,
The left and right side wall inner formworks 8 and 9 are interlocking links 14 and 1
The inner frame 2 is rotated inward by the traction drive of 5, and the inner frame 2 is contracted.

When the movable post 13 reaches the lower end position, the inner frame 2 is held in a contracted state by fixing the movable post 13 to the fixed post 11 with the latching means 20, and is held in a contracted state by a suitable hanging means. It is pulled out from the box culvert product 6. After removing the inner frame 1, the box culvert product 6 is lifted from the outer frame 1.

[Example] In the illustrated example, the box culvert is an arch-shaped box culvert with an arched upper wall, and the outer frame 1 made of a single iron plate has a U-shaped longitudinal section. There is. The arch portion 21 of the outer frame 1 is fixed to a base 26 via reinforcing members 24 and 25. Rising part 2 on the left side of outer frame 1
2 is a side frame body 28 fixed via a reinforcing member 27.
is fixed to. The rising portion 23 on the right side of the outer frame 1 connects to the movable side frame body 3 via a reinforcing member 30.
It is fixed at 0.

At the upper ends of the left and right rising parts 22 and 23 of the outer frame 1, there is a mounting plate 3 for a width positioning steel rod 33.
1 and 32 are fixed. Width positioning steel rod 33
When the nut 34 at the end of the frame 1 is loosened and the width positioning steel rod 33 is removed, the rising portion 23 on the right side of the outer frame 1 is removed.
is bent and deformed, moves outward together with the side frame 30, and is peeled off from the box culvert product 6. Note that the left rising portion 22 can also be configured to be movable outward in the same manner.

The upper wall inner formwork 7 and the left and right side wall inner formworks 8 and 9 of the inner frame 2 are made of the same iron plate, and the lower wall inner formwork 10 is made of a different iron plate. The reinforcing plate 35 fixed to the inner surface of the upper wall internal formwork 7 and the reinforcing plates 36 and 37 fixed to the inner surfaces of the left and right side wall internal formworks 8 and 9 are completely separated,
The side wall inner formworks 8 and 9 are rotatable in and out around their lower ends. The horizontally long frame body 12 is fixed to a reinforcing plate 38 of the lower wall inner form 10 via a channel member 39.

The reinforcing plates 36 and 37 of the side wall inner formworks 8 and 9 include
Two sets of receiving parts 40 and 41 are provided at the lower end and corner parts. A total of five sets of receiving portions 42 are provided on the reinforcing plate 35 of the upper wall inner formwork 7 at the left and right upper end portions and at the middle portion. Positioning tools provided on the end frame bodies 43, 44 are inserted and locked into these receiving parts 40, 41, 42. The joint members 3 and 4 are provided on end frame bodies 43 and 44. Positioning pins 45, 46, 47 are provided on the side wall inner form frames 8, 9 and the lower wall inner form frame 10 to engage with the receiving portions on the side of the joint members 3, 4.

One of the end frames 43 and 44 is connected to the outer frame 1 of the inner frame 2.
The other end frame body is joined to the outer frame 1 and the inner frame 2 with the inner frame 2 suspended in a predetermined position.
The outer frame 1, the inner frame 2, the end frames 43, 44, the side frames 28, 30, and the base 26 are fastened to each other by suitable means such as bolting.

The movable post 13 is equipped with rollers 48 and 49 guided by the fixed post 11. The fixed post 11 is fixed to an H-shaped member 50 that spans and is fixed to the reinforcing plate 35 of the upper wall inner formwork 7, and is fixed to the diagonal member 51,
It is reinforced and supported by 52.

The latching means 20 is composed of a pin that is inserted into and removed from two horizontal holes 53 and 54, upper and lower, of the fixed post 11 and one horizontal hole 55 of the movable post 13. A chain 5 for preventing loss is attached to the holding plate 56 for operating the pin.
One end of the chain 57 is attached, and the other end of the chain 57 is attached to the movable post 13.

The left and right side wall inner forms 8 and 9 are provided with downwardly protruding stopper plates 58 and 59 that come into contact with the left and right ends of the lower wall inner form 10 during inward rotation. The inner ends of the interlocking links 14, 15 are provided with slots 60, 61 for free movement in the longitudinal direction, and the horizontal pivots 1
8 and 19 are inserted into the slots 60 and 61.

End plates 62 and 63 are fixed at right angles to the lower ends of the reinforcing plates 36 and 37 of the inner formworks 8 and 9 of the side walls, and end plates 64 and 65 are fixed to the left and right upper ends of the inner formwork 7 of the upper wall part.
are fixed at right angles. At the end of the inward rotation of the side wall inner forms 8, 9, the end plates 62, 63 abut against the end plates 64, 65.

An end plate 6 is provided at the upper end of each of the inner formworks 8 and 9 of the side wall.
6 and 67 are fixed at an angle. End plates 68 and 69 are fixed to the left and right ends of the lower wall inner form 10 at opposite inclinations, and the lower wall inner form 10 is wedge-shaped as a whole. By abutting the end plates 66, 67 and the end plates 68, 69 over their full widths, the lower wall inner form 10 and the left and right side wall inner forms 8, 9 are joined without a step.

In addition, the outer frame 1, the inner frame 2, the end frame bodies 43, 44,
The method and means for fastening the side frames 28, 30 and the base 26 to each other are not particularly limited.

[Effects of the Invention] As described above, in the box culvert manufacturing formwork of the present invention, the fixing post 11 is vertically fixed to the center of the inner surface of the upper wall inner formwork 7, and the fixing post 11 is fixed vertically to the inner surface of the lower wall inner formwork 10. A horizontally long frame body 12 is fixedly installed, a movable post 13 that can move up and down along the fixed post 11 is fixedly installed at the center of the lower surface of the horizontally long frame body 12, and interlocking links 14 and 15 are installed in the formworks 8 and 9 in the side wall portions. The outer end is connected to the horizontal axis 16,
17, and the inner ends of the interlocking links 14, 15 are connected to the horizontally long frame 12 by horizontal pivots 18, 19.
The movable post 13 is connected to the left and right ends of the fixed post 11 in both the ascending end position and the descending end position.
Since the latching means 20 is provided to fix the lower wall inner form 10 to the main body of the inner frame 2, even in the contracted state where it is detached from between the side wall inner form frames 8 and 9, the lower wall inner form 10 is connected and held to the main body part of the inner frame 2, and the inner frame Since all of the constituent parts of 2 can be hung and held as one body, the process of assembling the formwork and demolding the product can be greatly simplified.

In addition, each operation of inward rotation and outward rotation of the side wall inner formworks 8 and 9 is performed by releasing the latching means 20 and then lowering or raising the movable post 13 by guiding it to the fixed post 11. As a result, the assembly of the mold, including the process of expanding and contracting the inner frame 2, and the demolding of the product can be carried out efficiently.

[Brief explanation of the drawing]

FIG. 1 is a left side view of a box culvert manufacturing formwork in an assembled state according to an embodiment of the present invention;
FIG. 2 is a longitudinal sectional view of the formwork. FIG. 3 is a longitudinal sectional view showing the process of demolding the mold. 1... Outer frame, 2... Inner frame, 3, 4... Connection member, 5... Top open part, 6... Box culvert product, 7... Top wall inner formwork, 8, 9... Side wall Internal formwork, 10... lower wall internal formwork, 11... fixed post, 12... oblong frame body, 13... movable post,
14, 15... Interlocking link, 16, 17... Horizontal pivot, 18, 19... Horizontal pivot, 20... Latching means, 21... Arch portion, 22, 23... Rising portion, 24, 25... Reinforcement member, 26... Base, 27... Reinforcement member, 28... Side frame, 29
... Reinforcement member, 30 ... Side frame body, 31, 32 ...
...Mounting plate, 33...Width positioning steel rod, 3
4... Nut, 35, 36, 37, 38... Reinforcement plate, 39... Channel profile for connection, 40, 4
1, 42... Receiving part of positioning tool, 43, 44...
End frame body, 45, 46, 47... positioning pin,
48, 49...Roller, 50...H-shaped material, 51,
52... Reinforcing diagonal material, 53, 54, 55... Horizontal hole, 56... Operation holding plate, 57... Chain, 58,
59... Stopper plate, 60, 61... Horizontal pivot slot, 62, 63... End plate, 64, 65
... End plate, 66, 67 ... End plate, 68, 69
...End plate.

Claims (1)

[Claims] 1. Fitting the joint members 3 and 4 between the front and rear ends of the outer frame 1 and the inner frame 2, whose longitudinal axes are arranged horizontally,
This is a formwork for manufacturing a box culvert in which concrete is poured from the open top part 5 of the outer frame 1, and the inner frame 2 is an upper wall inner formwork 7 for forming the upper wall of the box culvert, and the entire side wall of the box culvert. It consists of approximately L-shaped side wall inner formworks 8 and 9 that form a part of the lower wall part, and a lower wall inner formwork 10 that forms the central main body part of the lower wall part of the box culvert. The inner frame 2 is arranged upside down so that the inner formwork 7 is on the lower side, and the left and right side wall inner formworks 8 and 9 are supported rotatably around their respective lower ends, and the lower wall inner formwork 10
is inserted between the inner formworks 8 and 9 of the side wall portions to prevent inward rotation of the inner formworks 8 and 9 of the side wall portions, and the upper wall inner formworks 7
A fixed post 11 is fixed vertically at the center of the inner surface of the
A horizontally long frame body 12 is fixed to the inner surface of the formwork 10 in the lower wall portion, and a fixed post 11 is provided at the center of the lower surface of the horizontally long frame body 12.
A movable post 13 that can be moved up and down along is fixedly installed,
The outer ends of the interlocking links 14 and 15 are connected to the side wall inner forms 8 and 9 by horizontal pivots 16 and 17, and the inner ends of the interlocking links 14 and 15 are connected to the horizontal pivots 18 and 19.
is connected to the left and right ends of the horizontally elongated frame 12, and the lower wall inner form 10 is inserted between the side wall inner forms 8 and 9 at the rising end position, and the lower wall inner form 10 is connected to the side wall inner mold. At the lower end position separated from between frames 8 and 9,
A formwork for manufacturing a box culvert provided with a latching means 20 for fixing a movable post 13 to a fixed post 11.