JPH0658015B2 - Step set formwork - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention, when concrete is used to form a wall such as a manhole, concrete is placed so that steps are projected on the wall of the concrete. The present invention relates to a step set formwork capable of holding steps on the wall surface of the formwork.

[Prior Art] Conventionally, when a manhole or the like is produced by pouring concrete, a plurality of divided inner and outer sets of cylindrical formwork are stacked and assembled, and concrete is placed between these inner and outer formwork. The wall of the manhole is formed by casting. Then, U-shaped steps are projected on the inner wall surface of the manhole at a predetermined interval and are used as a substitute for a ladder. Therefore, in order to hold this step in a part of the plurality of inner molds described above. The stepset formwork having the structure of was used.

An example of such a step set mold is disclosed in, for example, Japanese Utility Model Laid-Open No. 60-442. This formwork is notched according to the thickness of the legs so that the pair of legs of the U-shaped step fits into the flanges of the end faces that join together when the formwork is assembled. It has been subjected. And, when the formwork is assembled with the pair of legs of the step held in this cut and concrete is placed,
Both legs of the step are embedded in the concrete wall surface, and the step comes to project from the concrete wall surface.

Further, in a formwork having a structure for holding steps disclosed in Japanese Patent Publication No. 51-4580, an oblong shape is formed so that the steps can be inserted horizontally at a predetermined position on the wall surface of the formwork. Guide holes are provided, concrete is placed with the leg portions of the step projecting outward from the guide holes, and the handle portion of the step is projected on the concrete wall surface.

[Problems to be Solved by the Invention] However, in each of the above-described conventional formwork, the former is a structure in which a notch is provided in the flange portion of the formwork and the step is held in this notch, so the mounting position of the step on the concrete wall surface Since there is no change in the height of the mold, there is a drawback in that there is no freedom in the mounting position in the vertical direction.

Also, in the latter formwork, since the step is held by the guide hole provided at the predetermined position on the wall surface of the formwork, the mounting position of the step on the concrete wall surface is preset, and the mounting position of the step can be freely set. It has the disadvantage of not having a degree.

Therefore, in order to solve the above-mentioned drawbacks, an object of the present invention is to provide a step set formwork in which the mounting position of the step on the concrete wall surface can be adjusted in the vertical direction.

[Means for Solving the Problems] Next, means for achieving the above-mentioned object will be described with reference to FIGS. 1 and 2 corresponding to the embodiment.

The step set mold of the present invention is composed of a rectangular opening window 21 formed on the wall surface of the mold and a plurality of horizontally long rectangular plate members which are vertically connected to close the opening window 21. A holding plate 26 having a hole 28 for holding the leg portion of step 4 formed in a concave shape and two blind plates 27 connected to the upper or lower side of the holding plate 26 so as to be interchangeable. The metal fitting 25 and a rail 22 which is fixed to the wall surface of the mold 20 along one side edge of the opening window 21 and is long in the vertical direction for guiding and holding one side edge of the receiving metal fitting 25, and the opening window 2
A vertically long holding metal fitting 24, which is detachably fixed to the wall surface of the form 20 along the other side edge of 1, and guides and holds the other side edge of the receiving metal fitting 25, and the rail 22 and the holding metal fitting 24. Fixing holes 2 formed in the upper and lower stages of the guide holding part
2a and 24b, and bolts which are screwed to press and fix the receiving metal fitting 25.

[Operation] In order to fix the step 4 to the wall surface of the form 20, the holding plate 26 and one of the two blind plates 27 are held with the leg 4b held in the hole 28 of the holding plate 26. One side edge is inserted and held by inserting and holding the side edge into the rail 22 and attaching the holding metal fitting 24. Next, a bolt 2 is screwed into the fixing holes 22a and 24b of the rail 22 and the holding metal fitting 24, and the receiving metal fitting 2 is formed of the holding plate 26 and two blind plates 27.
5 is fixed by pressing. In this way, the receiving metal fitting 25 closes the opening window 21 of the mold 20 while holding the step 4.

In order to adjust the position of step 4 up and down, it is possible to finely adjust up and down by loosening the bolt, sliding the receiving metal fitting 25 up and down, and tightening the bolt again. Also, 2
By replacing one of the blind plates 27 with the upper part or the lower part of the holding plate 26, the position of step 4 can be adjusted stepwise by the vertical height of the blind plate 27.

The formwork 20 holding the step 4 is combined with other formworks 2 and 3 and assembled into a predetermined shape.
Concrete is poured between 3 and 20. Then, when the concrete forms are hardened and the molds 2, 3 and 20 are removed, step 4 is provided at a desired position on the concrete wall surface 1a.

[Embodiment] FIG. 1 is an exploded perspective view showing an embodiment of a stepset formwork according to the present invention, and FIG. 2 is a plan sectional view showing a usage state of the stepset formwork according to the embodiment.

As shown in FIG. 2, the formwork used when forming the cylindrical wall 1 such as a manhole made of concrete is composed of an inner formwork 2 and an outer formwork 3, and a plurality of lengthwise and widthwise sides, respectively. It can be divided into. A flange portion 2 having substantially oval mounting holes on the four end faces of each of the molds 2 and 3.
a and 3a are formed. When assembling the molds 2 and 3, the flanges 2a and 3a of these molds are made adjacent to each other, and the molds 2 and 3 are fixed through the mounting holes with bolts, nuts, U-clips, or the like. ing.

Then, in a state where the inner formwork 2 and the outer formwork 3 are concentrically doubly installed, concrete is placed between the formworks 2 and 3 to form a cylindrical concrete wall body 1. To form.

By the way, in a manhole made of concrete or the like, on an inner wall surface 1a thereof, steps 4 which serve as a substitute for a ladder for workers to enter and exit are provided at predetermined intervals in the vertical direction. This step 4 is formed in a U-shape in a plan view, and the U-shaped portion projecting from the inner wall surface 1a of the manhole serves as a handle portion 4a, and a pair of leg portions further extended from both leg portions of the handle portion 4a. 4b is embedded in the concrete wall 1. The step 4 is held by the step set mold 20 which constitutes a part of the inner mold 2 described above. Then, the molds 2, 3 and 20 are assembled while holding the step 4, the tips of the pair of legs 4b are buried in the concrete wall body 1 by pouring concrete, and the handle 4a is a step set. It is designed to be provided on the inner surface side of the form 20.

As shown in FIG. 1, this step set formwork 20 is
The outer shape is a curved shape that is substantially the same as the other molds 2 and 3, and like the above-described molds 2 and 3, four end faces are formed with flange portions 20a, and each flange portion 20a has a mounting hole. A plurality of each is provided. Further, on the wall surface 20b of the step set formwork 20, a rectangular opening window 2 is formed.
1 is provided. Inside the opening window 21, that is,
A rail 22 is fixedly installed on one wall 20b inside the mold 20 along one vertical side of the opening window 21, and a pair of upper and lower protrusions 23, 23 are planted along the other vertical side of the opening window 21. It is set up. The rail 22 has a gap between the rail 22 and the wall surface 20b so that the plate material can be locked, and the fixing hole 22a is provided.
Are provided, and butterfly bolts (not shown) are screwed on. Further, a holding metal fitting 24 formed of a rectangular plate material is attached to the protrusion 23. The holding metal fitting 24 has dulmer holes 24a at both ends in the longitudinal direction, and after fitting the large diameter side of the dharma hole 24a into the protrusion 23, the holding metal fitting 24 is moved toward the opening window 21. By sliding
It can be attached to the form 20. Further, this pressing metal fitting 24 is also formed with a fixing hole 24b similar to that of the rail 22 described above, and a wing bolt (not shown) is screwed on.

Next, the receiving metal fitting 25 for closing the opening window 21 is composed of a holding plate 26 and two blind plates 27, 27. Each plate 26,
27 is also formed in a curved shape similar to the wall surface of the form 20,
The opening window 21 is closed while the plates 26 and 27 are arranged in series. The blind plate 27 is provided with a knob 27a protruding substantially at the center of the plate surface.

A pair of holes 28 that are cut out in a substantially semicircular shape are provided at the lower edge of the holding plate 26. The leg portions 4b, 4b of step 4 are fitted and held in the hole portions 28, respectively.

In addition, the handle portion 4 of step 4 is provided in the middle of each hole 28.
A setter 29 as a fixture for holding a is projectingly provided. The setter 29 is composed of a projecting plate 30 that is projectingly fixed to the inner wall surface of the holding plate 26 and a rectangular support plate 31 that is detachably fixed to the tip of the projecting plate 30. At the tip of the protruding plate 30, a through-hole 3 having a substantially oval shape is formed.
Two are provided. On the other hand, an embedded bolt 33 is planted in the center of the upper surface of the support plate 31, and the through hole 32
It is designed to be inserted. Then, by screwing the wing nut 34 onto the embedded bolt 33 that has been inserted,
The supporting plate 31 is attached to the tip of the projecting plate 30 while holding the step 4. Further, holding pieces 35 are provided in the vicinity of both ends of the upper surface of the support plate 31 so as to project in the same direction as the embedded bolt 33. The distance between the holding pieces 35, 35 is the leg 4b of step 4,
4b, and the leg portions of the handle portion 4a of step 4 are held by the L-shaped portions at both ends formed by the holding piece 35 and the end portion of the support plate 31. ing.

Therefore, the step set formwork 20 configured as described above
Then, first, the grip portion 4a of step 4 is held on the support plate 31, and the support plate 31 is fixed to the projecting plate 30 with the wing nut 34. At this time, the amount of protrusion with respect to the concrete wall surface in step 4, that is, the position of step 4 with respect to the holding plate 26 is arbitrarily set. Then, in step 4, the handle portion 4a is fixed between the projecting plate 30 and the support plate 31, the both working portions 4b are fitted into the holes 28 of the holding plate 26, and the both leg portions 4
It is held horizontally so that the tip of b is projected to the outer surface side of the holding plate 26.

The holding plate 26 holding the step 4 covers the upper part of the opening window 21, and one side edge thereof is engaged above the rail 22. Further, the two blind plates 27 are adjacent to directly below the holding plate 26 and one side edge thereof is arranged on the rail 2 side.
The lower part of the opening window 21 is closed by engaging with the lower part of 2. At this time, each of the plates 26, 27, 27 closes the opening window 21 in a continuous state in the vertical direction, and is held in Step 4.
The ends of the both leg portions 4b project toward the concrete side with respect to the surface of the formwork 20 in contact with the concrete.

Next, the pressing metal fitting 24 is attached to the protrusion 23 while pressing the other side edge of each of the plates 26, 27, 27. Then, the fixing fittings 24 and the fixing holes 24b, 2 of the rail 22 are provided.
A wing bolt is screwed onto 2a to fix the holding plate 26 and the blind plate 27 to the wall surface 20b of the form 20.

With step 4 held, the molds 2, 3 and 20 are assembled in the circumferential direction and the vertical direction, and the molds are connected with U clips or bolts and nuts to install the inner and outer molds.
After that, concrete is placed between each form. At this time, the tips of the legs 4b of the step 4 project between the molds from the outer surface of the inner mold (step set mold).

When the molds 2, 3 and 20 are removed after the concrete has hardened, both legs 4b of step 4 are embedded in the concrete, and the manhole is completed with the handle 4a protruding from the concrete inner wall surface 1a. To be done.

In the present embodiment, an example in which the setter 29 is provided on the holding plate 26 and the projecting length of the step 4 with respect to the concrete wall surface can be arbitrarily set is described. However, the step 4 is provided on the periphery of the hole 28 of the holding plate 26. A flange-shaped protrusion or the like may be formed so that it can be supported, and step 4 may be held.

Further, in the present embodiment, an example in which the holding plate 26 provided with the hole portion 28 for holding the step 4 and the setter 29 is fixed above the opening window 21 is described, but in the step set formwork according to the present invention, The holding plate 26 can be fixed at any position in the vertical direction of the opening window 21, and the mounting position of the blind plate 27 can be appropriately changed according to the mounting position of the holding plate 26, so that the wall of the manhole wall Step 4 can be mounted at any desired position in the.

Further, in the present embodiment, the example in which the step is provided on the inner wall surface of the manhole is described, but the present invention can be applied not only to the inner wall surface but also to the outer wall surface. In this case, an opening window is provided in the outer mold, and a holding plate provided with holes, setters, etc. for holding steps can be attached.

Further, the formwork of the present invention is not limited to manholes, but can be applied to any structure made of concrete, as long as it is manufactured using the formwork.

[Effects of the Invention] As described above, according to the step set formwork of the present invention, the metal fitting 25 for holding the step and closing the opening window 21 of the formwork 20 is provided with the leg part of the step 4 at the edge. Since the hole portion 28 for holding is formed by a holding plate 26 formed in a concave shape and two blind plates 27 that are connected to each other above and below the holding plate 26 so as to be interchangeable, two blind plates are provided. By replacing one of the two 27 with the upper part or the lower part of the holding plate 26, the vertical position of step 4 can be adjusted stepwise by the vertical height of the blind plate 27.

Further, after one side edge of the receiving metal fitting 25 formed by the holding plate 26 and the two blind plates 27 is inserted and held in the rail 22, the holding metal fitting 24 is attached to the form 20, so that the other side edge is attached. Since the holding metal fitting 25 is held, it is easy to attach and detach the receiving metal fitting 25, and it is not necessary to regulate the lateral width of the receiving metal fitting 25 so accurately, and the handling is easy. Further, since the bolts are screwed into the fixing holes 22a and 24b of the rail 22 and the holding metal fitting 24 to press and fix the receiving metal fitting 25, the bolts are loosened to be integrated with the receiving metal fitting 25 in step 4.
There is an effect that the vertical position of step 4 can be finely adjusted by moving up and down.

Therefore, there is an effect that it is possible to project the step even in a place such as the bottom of the manhole where the vertical mounting positions of the step cannot be projected with an equal gap.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a step set mold according to the present invention, and FIG. 2 is a plan sectional view showing a usage state of the step set mold according to the same embodiment. 1 ... Concrete wall, 4 ... Step, 4b ... Leg, 20 ... Step set formwork, 20b ... Wall, 21 ... Open window, 25 ... Bracket, 28 ... Hole.

Claims (1)

[Claims] 1. A step (4) projecting from a concrete wall (1) comprises a formwork (2) on which concrete is cast.
0) The step set mold which is to be held on the wall surface of the frame 0) has a rectangular opening window (21) formed on the wall surface of the mold.
And a hole portion (28) for holding the leg portion of the step (4) is concavely formed in the edge portion, which is composed of a plurality of horizontally long rectangular plate members that are vertically connected to close the opening window (21). A receiving metal fitting (25) composed of a holding plate (26) formed in a shape of a ring and two blind plates (27) connected to the holding plate (26) so as to be interchangeable above and below, and the opening window ( 21) along one side edge of said form (2
0) rails (22) which are fixed to the wall surface of the receiving metal fitting (25) and guide and hold one side edge of the receiving metal (25), and the mold along the other side edge of the opening window (21). (2
0) is removably fixed to the wall surface of the metal fitting (25)
A vertically long metal fitting (2 that guides and holds the other side edge of the
4), and fixing holes (22a), (24) formed in the guide holding portions of the rail (22) and the press fitting (24) in a multi-tiered structure.
and a bolt that is screwed to b) and press-fixes the receiving metal fitting (25).