JPH0994815A - Form for molding rectangular block - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a form which can mold rectangular concrete blocks having different header face slant angles without installing a partition plate or replacing a face plate. SOLUTION: An architrave-shaped face plate (a bottom plate of a vertical placing mold or a partition plate of the header part of a horizontal placing mold) 13 which forms a slanted header face is composed of a member including two U-shaped plates and two strips 15, the strip 15 is placed to move freely along the middle side 14a of the U-shaped plate, the ends of both side sides 14b of the U-shaped plates are connected with each other to move relatively in the longitudinal direction, and the angular part of the U-shaped plate is supported to be able to move by a jack or a screw rod. When the header face is slanted, the length of a side in the slant direction is increased, and the width of a side perpendicular to the slant direction is increased. The ends of the side sides of the U-shaped plates are moved relatively to each other in the longitudinal direction to respond to the change in the length of the sides, and the strip 15 is moved in the width direction to the middle side 14a of the U-shaped plate to respond to the change in the width of the sides.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for molding a rectangular tube-shaped concrete block having an inclined front surface.

[0002]

2. Description of the Related Art Square tube-shaped concrete blocks such as box culverts are used to construct an underdrain.
In the straight part of the underdrain, a block whose forehead is a plane perpendicular to the axis is used, but in the part where the underdrain bends, the block shown in FIG.
As shown in (1), a block in which the foreside surface 41 is inclined with respect to the axis P is required, and the inclination angle of the foreside surface 41 must be changed depending on the curvature of the bent portion. Since the underdrain is usually constructed under the road, it needs to be bent according to the bend of the road, and the curvature of the bent portion often differs depending on the construction site. In such a case, it is uneconomical to prepare individual molds with small plates having different inclination angles according to the shape of the required block. It is usual to insert a partition plate diagonally into the molding space (cavity) of (the frame for molding the block of the straight line portion) to mold the block having the slanted face.

[0003]

However, in accordance with the required inclination of the edge face, a partition plate matching the angle is prepared so that no space is formed between the partition plate and the side plate or the core mold. There is a problem that the work of mounting the is very troublesome, and arrangement errors and work mistakes easily occur. Further, it is necessary to prepare a separate partition plate for each different inclination angle, which is a problem in that production and management are troublesome.

An object of the present invention is to obtain a formwork capable of forming a rectangular concrete block having a small angle of inclination and a different inclination angle without exchanging members.

[0005]

The mold according to claim 1 is
A mold for vertically molding a rectangular tubular block (with the axis P of FIG. 8 in the vertical direction), which includes a base 1 and a side plate 2 that can be opened and closed.
An outer frame 4 provided with 3, a core frame 12 erected in the center of the outer frame 4, and a frame-shaped bottom plate 13 mounted between the outer frame 4 and the core frame 12, The bottom plate 13 is composed of two U-shaped plates 14,
14 and two strips 15 and 15, and the strips 15 and 15
Is attached to the center sides 14a and 14a of the U-shaped plates 14 and 14 so as to be movable in the width direction. It is movably connected, and the corner portions of the U-shaped plates 14, 14 are supported by a jack 32 provided on the base 1 so as to be able to move up and down.

A mold according to claim 2 is a mold for flat-molding a rectangular tubular block (with the axis P of FIG. 8 in the horizontal direction), and includes a base 1, two side plates 2 and The outer frame 4 having the fore edge plate 35, the bottom plate 13 located below the outer frame 4, and the core frame 12 mounted so as to penetrate through the center of the fore edge plate 35.
And a frame-shaped partition plate 37 arranged near the inside of at least one of the edge plates, and the partition plate 37 includes two U-shaped plates 14 and 14 and two strip plates 15 and 15. Strip 1
Reference numerals 5 and 15 are attached to the central sides 14a and 14a of the U-shaped plates 14 and 14 so as to be movable in the width direction.
The front ends of both side edges 14b and 14b of the reference numerals 4 and 14 are connected to each other so as to be relatively movable in the longitudinal direction.
A screw rod 38 whose four corners are horizontally connected to the edge plate 35.
It is characterized in that it is connected so that it can be moved in and out freely.

According to a third aspect of the present invention, there is provided the rectangular tubular block forming mold according to the first or second aspect, wherein the U-shaped plates 14 and 14 are provided.
Mounted between the central sides 14a, 14a and the strips 15, 15 and closing the gap between them, and the side edges of the U-shaped plates 14, 14 are attached to each other. The second auxiliary plate 23 for closing the gap between the two is provided.

[0008]

When the edge face of the rectangular tubular block is tilted, the length of the side in the tilt direction becomes longer and the width of the side in the direction perpendicular to the tilt becomes wider. The ratio of lengthening or widening is 1 / cos θ times, where θ is the inclination angle of the edge face.

In the mold of the present invention, in the bottom plate 13 of the vertical punching mold or the partition plate 37 of the flat punching mold for molding the small surface of the block, the side in the slanting direction becomes long. In contrast, the two U-shaped plates 14, 14 are made to move by relatively moving the side end portions of the side edges relative to each other in the longitudinal direction. Since it can be dealt with by moving the plates 15 and 15 in the width direction with respect to the central sides 14a and 14a of the U-shaped plate, it is possible to deal with any block having a different edge angle of the forefront.

The lengths of the side edges 14b, 14b of the two U-shaped plates are the lengths of the corresponding edges when the tips of the side edges are abutted against each other and the entire length thereof is when the edge face is a plane perpendicular to the axis. And the width of the strips 15, 15 and the central side 14 of the U-shaped plate.
When the widths of a and 14b are the widths obtained by adding them, the widths of the corresponding sides when the foreground surface is a plane perpendicular to the axis are:
By the movement when tilting the edge face, the side edge 1 of the U-shaped plate
A gap is formed between the tip ends of 4b and 14b and between the central side 14a of the U-shaped plate and the strip plate 15.

According to the third aspect of the invention, this gap is closed by the first auxiliary plate 27 and the second auxiliary plate 23, respectively. Therefore, according to the third aspect of the present invention, it is possible to mold the block having the slanted stepless edge surface.

It should be noted that without providing such auxiliary plates 27 and 23, the back sides of one side of the central sides 14a and 14a of the U-shaped plates 14 and 14 and the band plates 15 and 15 are brought into sliding contact with the other side and the width direction. Movable structure and / or U-shaped plate 14, 1
It is also possible to have a structure in which one of the rear ends of the four side edges is in sliding contact with the other surface and is relatively movable in the longitudinal direction. With such a structure, a step corresponding to the plate thickness will be generated on the forefront surface of the molded block,
The bottom plate 13 with the vertical direction of the sliding contact part reversed, or the partition plate 37 with the sliding contact part with the inner and outer directions reversed, is formed into a pair of blocks with the direction of the step reversed, and the steps are engaged with each other. It is possible to connect the pair of blocks in a closed state without a gap.

[0013]

1 to 6 show an example of a box culvert molding form having the structure according to the first aspect of the present invention. This formwork is provided with a rectangular base 1 formed by assembling shaped steel, and side plates 2 and 3 are attached to the four sides of the base so as to be openable and closable around a horizontal axis to form an outer frame 4. . In the center of the base 1, a core main frame 8 having a planar U-shape with a flexible portion 7 provided with three face plates 5, 6, 5 at its corners, and a rectangular face plate connecting both ends of the face plates 5, 5. Spacer 1 with 9
A core frame 12 composed of 1 and 1 is erected. The core frame 12 draws the spacer 11 inward, then the face plate 5,
5 is a structure in which the mutual diameters are reduced by pulling each other by a diaphragm mechanism (not shown). Below the outer frame 4 and the core frame 12, a frame-shaped bottom plate 13 is mounted.

The bottom plate 13 includes two U-shaped plates 14, 14 and 2
It is provided with the strip plates 15 and 15. U-shaped plate 14, 14
Is one in which the ends of three strips are welded to form a U-shape, and has a central side 14a and two side sides 14b. A square pipe member 16 is welded to the lower surface of the side edge 14b, and an inverted L-shaped member 17 is welded to the lower surface of the central edge 14a. Both ends of the inverted L-shaped member 17 are welded to the square pipe member 16, and these serve as a frame for imparting strength to the U-shaped plate 14 to withstand concrete pressure. An inverted L-shaped member 18 of the same shape as that provided on the central side 14a of the U-shaped plate is also welded to the lower surface of the strip 15 to give the strip 15 strength to withstand concrete pressure.

At the outer edges of the upper sides of the inverted L-shaped members 17 and 18,
A groove is formed and a packing material 19 is attached. Further, on both edges of the lower surface of the side edge 14b of the U-shaped plate, there are formed grooves 20 into which small L-shaped members are fixed and similar packing materials are inserted. In FIG. 5, one of the grooves is shown provided in a slide guide 16b described later. These packing materials are attached to prevent leakage of concrete from between the bottom plate 13 and the outer frame and the core frame.

Side 1 of one of the two U-shaped plates (see FIG. 4)
The square pipe member 16 provided on the side 4b projects from the tip of the side to form a slide protrusion 16a. The tip of the square pipe material 16 on the other side 14b of the U-shaped plate is at a position retracted from the tip of the side by the protruding length of the slide protrusion 16a, and the U-shaped portion is drawn from the tip of the retracted square pipe. A slide guide 16b having an L-shaped cross section is welded to the lower surface of the side edge up to the tip of the plate side edge. The slide protrusion 16a is
The slide guide 16b is slidably fitted into the slide guide 16b. By sliding both 16a and 16b,
The tip ends of the side edges of the U-shaped plates 14 and 14 relatively move in the longitudinal direction thereof.

On the side surface of the slide guide 16b, a long hole 21 in the longitudinal direction of the side is provided, and a bolt 22 inserted in this long hole is screwed into the slide projection 16a and fastened to form two sheets. The positional relationship between the ends of the side edges 14b, 14b of the U-shaped plate is fixed. A second auxiliary plate 23 having a plate thickness equal to that of the U-shaped plates 14 and 14 is slid by the screw 24 in the gap between the opposing side edges 14b and 14b generated by the relative movement in the longitudinal direction. It is fixed and attached to the upper surface of.

As shown in FIG. 6, strips 15 are attached to the central side 14a of the U-shaped plate at intervals 28 in the width direction. The upper surface of the U-shaped plate of the strip 15 has a male screw 2 on the lower surface.
A first auxiliary plate 27 in which 6 are planted at a constant pitch is welded to the U-shaped plate 14 side so as to extend in an eaves shape. Strip 15
Is in a state where the tip end side of the first auxiliary plate 27 extending like an eaves is in surface contact with the upper surface of the central side 14a of the U-shaped plate, and the male screw 26
A seat plate 29 of the same shape as the first auxiliary plate 27 inserted into the male screw 26 with a nut 31 screwed to the lower end of the U-shaped plate and the inverted L-shaped members 17 and 18 of both the central side of the U-shaped plate and the strip plate. By being sandwiched, it is fixed to the central side 14a of the U-shaped plate. In this structure, the strip plate 15 can be moved in the width direction by loosening the nut 31.

The strip plate 15 is attached to the core frame 12 side of the central side 14a of the U-shaped plate, and both ends thereof are fitted between the both sides of the U-shaped plate. Both ends of the first auxiliary plate 27 extend a little longer than the strip plate 15, and the extending portion makes surface contact with the upper surface of the side edge 14b to prevent the strip plate 15 from collapsing.

Square pipe material 1 at the corners of U-shaped plates 14 and 14
The end of the telescopic rod of the jack 32 standing on the base 1 is connected to 6 via a pivot pin 33 so that it can be moved up and down. The direction of this pivot pin is the central side 14a of the U-shaped plate.
The pivot pin 33 is pivotally connected to a short horizontal hole 34 provided in the square pipe member 16 to allow a slight lateral movement.

Next, the procedure for assembling the bottom plate will be described. With the bolt 22 and the nut 31 loosened, the jack 32 is operated to incline the U-shaped plates 14 and 14 at a desired angle. At this time, the slide protrusions 16a are attached to the slide guide 1
It is pulled out from 6b. Next, with the central side 14a of the U-shaped plate in contact with the side plate 3, the bolt 22 is fastened to fix the positional relationship between the U-shaped plates 14 and 14. Side 1 of U-shaped plate
The second auxiliary plate 23 is mounted with the screw 24 in the gap formed between the opposite ends of the 4b to form a single molding surface.
Next, the nut 31 is fastened while the strip 15 is in contact with the core frame 12, whereby the installation of the bottom plate 13 is completed.

FIG. 7 shows an embodiment of the invention of the flat-casting rectangular tubular block molding frame according to the second aspect of the invention. Side plates 2 and 2 are pivotally attached to one opposing side of the base 1, and the fore edge plates 35 and 35 located inside both ends of the side plates.
Is provided on the base. The edge plate 35 on the right side of the drawing is pivotally supported on the base 1 at its lower side, and the edge plate 35 on the left side is fixed to the base 1. Openings 36, 36 for mounting the core frame 12 are provided in the center of both of the edge plates. Fixed edge plate 35
A partition plate 37 having a structure similar to that of the bottom plate of the vertical casting mold is interposed in the vicinity of. The upper and lower horizontal sides of the partition plate 37 are formed by the sides of the U-shaped plate and are expandable and contractible. Further, the left and right vertical sides of the partition plate 37 are formed by the central side of the U-shaped plate and a band plate attached to the central side, and can be widened.
The corner portion of the U-shaped plate is connected to a horizontal screw rod 38 attached to the fixed edge plate 35, and the screw rod 38 is operated to set the advance / retreat position of the partition plate (the inclination angle of the edge face). be able to.

[0023]

As described above, according to the mold of the present invention, 1
It is possible to easily manufacture a rectangular tubular block such as a box culvert having a small surface with an arbitrary inclination angle with one mold. As a result, the trouble of having to prepare various types of partition plates according to the inclination angle of the edge plate is eliminated, it is possible to avoid the occurrence of mistakes in arrangement and management, and it is also possible to shorten the construction period.

[Brief description of drawings]

FIG. 1 is a plan view of a vertical box culvert molding formwork.

FIG. 2 is a side view of the formwork with one side plate removed.

FIG. 3 is a sectional view of an essential part when the formwork is cut at the center.

FIG. 4 is a side view showing a sliding portion of an extensible U-shaped plate.

FIG. 5 is a cross-sectional view of a slide portion.

FIG. 6 is a perspective view of a corner portion of the bottom plate.

FIG. 7 is a plan view of a flat box culvert molding formwork.

FIG. 8 is a perspective view showing a corner portion of an underdrain by box culvert.

[Explanation of symbols]

 1 Base 2 Side plate 3 Side plate 4 Outer frame 12 Core frame 13 Bottom plate 14a Central part 14b Side 15 Band strip 23 Second auxiliary plate 27 First auxiliary plate 32 Jack 35 Small plate 37 Partition plate 38 Screw rod

Claims (3)

[Claims] 1. A base (1), an outer frame (4) having side plates (2, 3) that can be opened and closed, and a core frame erected in the center of the outer frame (4).
(12) and a frame-shaped bottom plate (13) mounted between the outer frame (4) and the core frame (12), and the bottom plate (13) is composed of two U-shaped plates (14, 1).
4) and two strips (15, 15), the strips (15, 15) are attached to the central side (14a, 14a) of the U-shaped plate (14, 14) so as to be movable in the width direction. The two U-shaped plates (14, 14) are
b, 14b) are connected to each other so that their tips can move relative to each other in the longitudinal direction, and the corners of the U-shaped plates (14, 14) are supported by a jack (32) provided on the base (1) so that they can be moved up and down. A vertical-casting rectangular tubular block forming frame. 2. A base (1), an outer frame (4) having two side plates (2) and a small plate (35), respectively, and a bottom plate (13) located below the outer frame (4). A core frame (12) mounted so as to penetrate through the center of the fore edge plate (35), and a frame-shaped partition plate (37) arranged near the inside of at least one of the fore edge plates, Partition plate (3
7) is provided with two U-shaped plates (14, 14) and two strips (15, 15), and the strip (15, 15) is the central side (14a) of the U-shaped plate (14, 14). , 14a)
Is attached so that it can move in the width direction, and two U-shaped plates (1
4,14) are connected so that the tips of both sides (14b, 14b) are relatively movable in the longitudinal direction, and the corners of the U-shaped plate (14, 14) are horizontally connected to the edge plate (35). A flat-molding rectangular tubular block forming frame characterized by being connected to and separated from each other by an attached screw rod (38). 3. A first auxiliary plate (27) mounted between the central side (14a, 14a) of the U-shaped plate (14, 14) and the strip plate (15, 15) to close the gap between them. And a second auxiliary plate (23) that is mounted between the side edges of the U-shaped plates (14, 14) to close the gap between them.
The rectangular tubular block forming mold according to claim 1 or 2, further comprising: