JP3019766B2 - Method of constructing formwork for concrete structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a formwork of a concrete structure, and more particularly to a method of constructing a formwork of a foundation beam using a ribbed lath plate.

[0002]

2. Description of the Related Art Conventionally, various construction methods for constructing a concrete structure using a lath as a dam for a formwork have been adopted. Since this method uses lath for the weir, it is lighter and easier to process and assemble than plywood form, so it has good workability and is often used as a discard form. Therefore, dismantling of the formwork is also easy, which contributes to labor saving of formwork dismantling work.

[0003] Further, since the baffle plate is lath, the condition of the inside of the form can be easily checked, so that the state of the reinforcing bars before placing the concrete can be managed, and the situation of placing the concrete can be grasped very easily. There is an advantage that you can.

[0004] Furthermore, since surplus water in the concrete is discharged from the mesh of the lath, there is a feature that a high-quality concrete structure can be obtained.

[0005] As a method of using the above-mentioned lath as a dam for a formwork, a separator used for maintaining the spacing of the formwork is tied to a predetermined position of a main bar or a rib with a binding wire, and the lath is attached to the separator. There is a known construction method of attaching a steel sheet and reinforcing it with thick ends.

Another method is disclosed in Japanese Unexamined Patent Publication No. 5-59.
There is a construction method using a formwork device disclosed in Japanese Patent No. 733. As shown in FIG. 8, the formwork device used in this method has a plurality of level adjusting rods 30 projecting upward, and has a jaw 31 spanning the level adjusting rods 30.
The lower part is provided with a level adjusting hanging rod 33 having a plurality of hanging attachment parts 32, the level adjusting rod 30 protruding upward from an upper end of a reinforcing bar cage 34, and the jaw 3
1 has an abutment on an upper end bar 35 of a reinforcing bar cage 34 and is fixed to an upper portion of a rib bar 36, and the mounting portion 32 is fixed to a rib side portion 37 of the reinforcing bar cage 34.
In the upper part, the top end member 39 is vertically movably supported via a support bar 38, and a wire mesh 40 is vertically provided from both sides in the longitudinal direction of the support bar 38 to the side of the reinforcing bar cage 34. .

Further, as a runner for attaching a support for supporting a formwork which uses a lath as a weir plate, Japanese Unexamined Utility Model Publication No.
There is one disclosed in Japanese Patent No. 8844. As shown in FIGS. 9 (a) and 9 (b), the runner has a plurality of claw pieces 42 which are fitted along the longitudinal direction of the metal strip 41 at the lower ends of pipe supports for reinforcing the concrete formwork. However, each of the claw pieces 42 is formed by cutting and raising a tip of the claw piece 42 in a laid state in which the tip is raised from the surface of the band plate 41.

Note that in FIGS. 9A and 9B,
Reference numeral 44 denotes a runner fixing nail hole.

[0009]

However, all of the molds used in these methods have a problem that the members to which the laths are attached are tied to the reinforcing steel, so that they cannot be used with plain concrete.

[0010] Further, the assembling accuracy of the formwork largely depends on the arrangement of the reinforcing bars, and not only takes time and effort to correct the formwork, but also the formwork deforms due to the movement of the reinforcing bar during concrete placement.
There is also a problem that the finishing accuracy of the structure after the concrete is cast is significantly impaired.

In addition, when leveling the top, there is another problem that the L-shaped metal fitting for level adjustment becomes an obstacle, and it takes time to level the entire surface uniformly.

In addition, there is another problem that the mounting hardware having a screw for level adjustment must be buried and killed, thereby increasing the cost.

[0013] Further, when the column is to be built, the nails of the runner for mounting the column must be set up, and the column must be inserted into the claws. Therefore, the concrete leaking from the lath solidifies at the feet of the column and solidifies. There was also a problem that the pillar could not be removed even if it was to be removed, making it difficult to remove the pillar.

The present invention has been made to solve the above-mentioned problems of the prior art, and a form for a foundation beam using a lath can be easily and inexpensively constructed without depending on a reinforcing bar. It is another object of the present invention to provide a method of constructing a formwork for a concrete structure, in which the columns can be easily removed.

[0015]

SUMMARY OF THE INVENTION A method of constructing a formwork apparatus for a concrete structure according to the present invention comprises the following steps. (1) forming a lath panel by loosely connecting an L-shaped foot runner to the lower end of each long side of the pair of ribbed lath plates so as to be movable in the vertical direction; and (2) the ribbed lath plate. Connecting each L-shaped foot runner to which is connected for a predetermined interval and fixing it to discarded concrete;
(3) At least at both ends of the long side of the ribbed lath plate connected to each of the fixed L-shaped foot runners, a column having a longitudinal direction perpendicular to the long side can be moved only in the longitudinal direction. (4) temporarily fixing with a binding wire, and (4) inserting a temporary assembling hole provided in the support into both ends of the separator in which the space between the two flanges is adjusted to a predetermined space, and connecting the support to the opposite support. Erecting, forming a frame with the separator and the support by screwing a foam tie into screw portions provided at both ends of the separator, and (5) forming the ribbed lath plate on the temporarily assembled support during the final assembly. (6) a step of marking the level at which the upper end should be located, and (6) a step of loosening the form tie after the mark is completed and removing the separator from the support.
(7) Align the mark of one of the opposing struts from which the separator has been removed with the upper end of the ribbed lath plate on the same side as this strut, and pass one end of the separator through a fixing long hole provided in the strut. Fixing the separator to the support with a separator flange and a foam tie,
(8) The mark of the other pillar of the opposite pillar from which the separator is removed is aligned with the upper end of the ribbed lath plate on the same side as this pillar, and the other end of the separator fixed to the one pillar is Passing through the fixing long holes provided in the support, fixing the separator to the support with the separator flange and the form tie, and forming a frame by the support and the separator on both sides facing each other; (9) With the same rib A plurality of reinforcement columns are arranged at predetermined intervals between the columns arranged on the lath plate side, temporarily fixed to the ribbed lath plate with a binding wire, and a wire separator is hung between opposing reinforcement columns and tightened. And (10) a step of tightening the thick side material using a foam tie to stiffen the whole.

[0016] For example, 0.5 mm
By using an L-shaped foot runner molded from a thin steel plate, the side of the L-shaped foot runner that is not in contact with the discarded concrete, that is, a ribbed lath plate, even if the concrete is uneven A plurality of cuts corresponding to the unevenness are made on the side where the cut is made, and the other side corresponding to the cut position is bent upward or downward, so that the L-shaped foot runner runs over the entire length of the L-shaped foot runner. The runner can be brought into close contact with the surface of the concrete. Therefore, no gap is formed between the L-shaped foot runner and the surface of the discarded concrete, so that the poured concrete does not leak.

Further, since the L-shaped foot runner is used for the foot runner, the L-shaped foot runner is fixed on the discarded concrete, and the side of the L-shaped foot runner which is in contact with the discarded concrete surface. On top of this, stand upright so that the lower end is located, place a separator on the upper part of the opposing strut across the reinforcing bar, make the distance between the upper ends between both struts constant, and further lower the opposing strut Hang the wire separator around the part, tighten the wire separator,
When trying to keep the pillar from moving during concrete casting, the lower end of the pillar hits the side where the ribbed lath plate of the L-shaped foot runner is connected and does not move inward from it. The column can be firmly fixed.

In addition, a threaded separator is inserted into a round hole provided at a portion of the column protruding from the upper end of the ribbed lath panel to temporarily maintain a constant gap between the opposing columns, and to vertically support the column. By pulling up the upper end portion of the ribbed lath plate movably connected to the support along the column, the level at which the upper end portion of the ribbed lath plate is located when configured as a formwork is marked on the column. No special hardware for level adjustment is required.

Further, even if concrete leaks out from the mesh of the lath plate when concrete is poured and concrete at the foot of the strut accumulates and solidifies, the foot runner is L-shaped. The side of the lath plate side of the portion is in contact with one side of the L-shaped foot runner, and no concrete is deposited on this side. Therefore, it is easy to separate the pillar from the piled concrete, and the pillar can be easily removed.

Further, when constructing this formwork, since it can be constructed without contacting the reinforcing bar cage, it can be applied to the case of unreinforced concrete.

Furthermore, a mold can be constructed accurately regardless of the arrangement of reinforcing bars.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A formwork apparatus used in a method for constructing a formwork for a concrete structure according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing the concrete structure form device, and FIG. 2 is a perspective view showing a state in which a support and a lath plate in the concrete structure form device are fixed by a separator.

This formwork apparatus for a concrete structure is provided on both sides of the reinforcing bar cage 21 and has a lath plate 1 with ribs 1a whose height dimension is larger than the height dimension of the reinforcing bar basket 21. , One side 2 at the lower end of the lath plate 1
a is connected by a line 10 so as to be vertically movable, and the other side 2b is fixed to the surface of the discarded concrete 22; an L-shaped foot runner 2 having a cross section; and a lower end located on the L-shaped foot runner 2 The upper end protrudes from the upper end of the lath plate 1 with the rib 1a and sandwiches the rebar cage 21 with the plurality of columns 3 connected to the lath plate 1 with the rib 1a so as to be movable only in the vertical direction by a number line 11. Struts 3 facing each other
Screw portions 5a are provided at both ends in order to maintain a constant interval between the separators. The separator 5 has two flanges 4 for maintaining the interval, and is screwed to the thread portion 5a of the separator 5. A foam tie 6 that holds the support 3 between the support 3 and the flange 4 to keep the distance between the support 3 constant.
And a thick end member 7 sandwiched between the form tie 6 and the column 3 to prevent the column 3 from falling down in a direction orthogonal to the reinforcing bar 21. The rib 1a of the column 3 In a portion located slightly below the upper end of the lath plate 1 with a slot, an elongated hole 8 having a major axis in the vertical direction for inserting the separator 5 is also provided from the upper end of the lath plate 1 with the rib 1a of the column 3. The protruding part includes a rib 1a
When marking a mark 12 indicating the position of the upper end of the attached lath plate 1 on the support 3, a round hole for inserting the separator 5 or another separator and maintaining a constant interval between the opposed supports 3. 9 are provided.

Since the concrete structure formwork device of the present invention is constructed as described above, there is no leakage of concrete due to unevenness of discarded concrete, and removal of the foot runner is easy.

Further, since the reinforcing cage is not used when constructing the formwork, there is no influence of the deformation of the reinforcing cage and the accuracy of the formwork is good. Furthermore, no hardware for level adjustment is required.

The L-shaped foot runner 2 is 0.5 m
An L-shaped sheet made of a thin steel sheet having a length of about m is used, but a coated steel sheet is preferably used in consideration of the releasability from concrete.

Next, a method of constructing a form using the form apparatus for a concrete structure will be described with reference to FIGS. (1) As shown in FIGS. 3A and 3B, the lower side 1b of the lath plate 1 with the rib 1a and the L-shaped foot runner 2
Is loosely connected to the side 2a at a plurality of places by a number line 10 so that a slight vertical movement is possible,
A lath panel is configured. Note that the lath plate 1 with the rib 1a and the L-shaped foot runner 2 are overlapped in their longitudinal direction, that is, in the longitudinal direction of the rebar cage 21, with a slight overlap margin, so the overlap margin is taken into consideration. .

The lower side 1b of the lath plate 1 with the ribs 1a
When connecting the L-shaped foot runner 2 to one side 2a of the L-shaped foot runner 2, the rib 1a of the lath plate 1 with the rib 1a is set inside the formwork. FIG. 3C is a partially enlarged view of the lath plate 1 with the rib 1a.

(2) As shown in FIG. 4 (a), at the construction site, on the discarded concrete 22 on both sides of the reinforcing bar cage 21, the black ruled parallel to the longitudinal direction of the reinforcing bar cage 21 is set. A plurality of L-shaped foot runners 2 are nailed to the concrete discard 22 with their ends wrapped.

In order to cope with the irregularity of the discarded concrete 22, as shown in FIG. 4B, a notch 2c is cut with scissors on the side 2a of the L-shaped foot runner 2 connected to the lath plate 1 with the rib 1a. Then, the other side 2b of the L-shaped foot runner 2 is bent upward or downward at the cut portion 2c to match the unevenness of the waste concrete 22, and between the waste concrete 22 and the L-shaped foot runner 2, Nail with no gap.

(3) When the installation of the L-shaped foot runner 2 is completed, the two longitudinal ends of the lath plate 1 with the ribs 1a are overlapped with each other, and the lath plate 1 is tightly connected with the number line. At this time, in the joint portion of the lath plate 1 with the two ribs 1a, the connection is made such that the ribs 1a overlap.

Depending on the conditions at the site, the lath plate 1 with the rib 1a and the L-shaped foot runner 2 are not connected in advance, and the L-shaped foot runner 2 is installed in the above-described manner, and then the rib 1a is mounted. The lath plate 1 may be connected to the L-shaped foot runner 2.

(4) As shown in FIG. 5, at least at both ends in the longitudinal direction of the lath plate 1 with the ribs 1a, the support rod 3 is moved up and down by the number line 11 to such an extent that horizontal movement is restricted. Temporarily fix.

(5) Similarly, as shown in FIG. 5, the two flanges 4 of the separator 5 are
After adjusting the distance between the two flanges 4 to be equal to the inner dimension of the predetermined formwork, the two columns 3 opposed to each other with the reinforcing bar 21 interposed therebetween are vertically raised, and The separator 5 is passed through each round hole 9. At this time, as shown in FIG. 5, the two flanges 4
That is, it is located on the rebar basket 21 side. And
The form tie 6 is screwed into both threaded portions 5a of the separator 5, and the two flanges 4 and the form tie 6 sandwich the lath plate 1 with the ribs 1a and the columns 3 on both sides to form a frame.

(6) As shown in FIG. 6, when the mold is constructed, a mark 12 indicating the position to be occupied by the upper end of the lath plate 1 with the rib 1a is marked on the support 3.

(7) Loosen the foam ties 6 on both sides and remove the separator 5 attached to the column 3.

(8) The mark 12 of one of the supporting columns 3 from which the separator 5 is removed is aligned with the upper end of the lath plate 1 with the rib 1a on the same side as the supporting column 3, and The flange 4 of the separator 5 and the form tie 6 are passed through one end of the separator 5 through the fixing slot 8 provided.
Then, the separator 5 is fixed to the column 3.

(9) The mark 12 of the other pillar 3 of the opposite pillars 3 from which the separator 5 has been removed is aligned with the upper end of the lath plate 1 with the rib 1a on the same side as the pillar 3 and The other end of the separator 5 fixed to the support 3 is passed through a fixing long hole 8 provided in the support 3, and the separator 5 is fixed to the support 3 with the flange 4 of the separator and the form tie 6. Post 3 and separator 5
And form a frame.

(10) As shown in FIG. 7, in order to prevent deformation of the lath plate 1 with the ribs 1a at the time of placing concrete,
Attachment of the same support 3 as the support 3 at a pitch of 25 to 30 cm or a reinforcing support 13 made of a light-weight steel or a steel pipe of the same size to the lath plate 1 with the rib 1a by a wire number Between the support 3 and the reinforcing support 13 are tightened. Wire separator 1
Instead of 4, a round separator may be used.

(11) As shown in FIG. 1, the thick end 7 is sandwiched between the column 3 and the foam tie 6 to stiffen the whole.

When it is necessary to further stiffen the support 3, a plurality of long holes 8 may be provided in the support 3, and a thick end 7 may be used in the same manner as described above. It is also possible to pass through the side and attach the side end thick member 7 using the foam tie 6.

After a predetermined period has elapsed after the concrete has been cast, the column 3, the foam tie 6, the reinforcing column 13 and the lateral end thick member 7 are removed. In the method for constructing a formwork apparatus for a concrete structure according to the present invention, since the formwork is constructed as described above, the formwork can be constructed with high precision.

[0043]

According to the present invention, a formwork using a lath plate can be constructed without depending on the reinforcing steel, so that there is no deformation of the formwork due to the movement of the reinforcing steel when placing concrete.

Also, since the strut used for stiffening is marked with a level mark indicating the upper end position of the lath plate and the lath plate is attached to the strut, no metal for level adjustment is required.

Further, since the L-shaped foot runner is used as the foot runner, the support does not move inside the formwork, and the support can be easily removed.

In addition, since it is not affected by the arrangement accuracy of the reinforcing bars and the deformation of the reinforcing bars at the time of placing concrete, a highly accurate formwork can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a concrete structure form device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which a support and a lath plate are fixed by a separator in the concrete structure form device of one embodiment of the present invention.

3A and 3B are explanatory views showing a connection state between a ribbed lath plate and an L-shaped foot runner, wherein FIG. 3A is a perspective view, FIG. 3B is a side view, and FIG. 3C is a partially enlarged view of the lath plate. It is.

4A and 4B are explanatory views showing a method of fixing an L-shaped foot runner on discarded concrete, wherein FIG. 4A is a cross-sectional view showing a fixed state, and FIG. It is a perspective view showing the state which cut and bent the L-shaped foot runner.

FIG. 5 is a perspective view showing a state in which a support is attached to a lath plate in the concrete structure form device of one embodiment of the present invention.

FIG. 6 is a perspective view showing a state in which a level mark indicating an upper end position of the ribbed lath plate is marked.

FIG. 7 is a perspective view showing a state where a reinforcing column is attached.

FIG. 8 is a front view of a mold using a conventional ribbed lath panel.

FIG. 9 is an explanatory view of a conventional foot runner, in which (a) is a perspective view and (b) is a side view.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 lath plate with ribs 2 L-shaped foot runner 3 support 4 separator flange 5 separator 6 form tie 7 wide end material 8 long hole 9 round hole 10 line 11 line 12 mark 13 reinforcing column 14 wire separator

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E04G 17/00-17/14 E04G 9/06

Claims (1)

(57) [Claims] 1. A method of constructing a formwork apparatus for a concrete structure, comprising the following steps. (1) forming a lath panel by loosely connecting an L-shaped foot runner to the lower end of each long side of the pair of ribbed lath plates so as to be movable in the vertical direction; and (2) the ribbed lath plate. Connecting each L-shaped foot runner to which is connected for a predetermined interval and fixing it to discarded concrete;
(3) At least at both ends of the long side of the ribbed lath plate connected to each of the fixed L-shaped foot runners, a column having a longitudinal direction perpendicular to the long side can be moved only in the longitudinal direction. (4) temporarily fixing with a binding wire, and (4) inserting a temporary assembling hole provided in the support into both ends of the separator in which the space between the two flanges is adjusted to a predetermined space, and connecting the support to the opposite support. Erecting, forming a frame with the separator and the support by screwing a foam tie into screw portions provided at both ends of the separator, and (5) forming the ribbed lath plate on the temporarily assembled support during the final assembly. (6) a step of marking the level at which the upper end should be located, and (6) a step of loosening the form tie after the mark is completed and removing the separator from the support.
(7) Align the mark of one of the opposing struts from which the separator has been removed with the upper end of the ribbed lath plate on the same side as this strut, and pass one end of the separator through a fixing long hole provided in the strut. Fixing the separator to the support with a separator flange and a foam tie,
(8) The mark of the other pillar of the opposite pillar from which the separator is removed is aligned with the upper end of the ribbed lath plate on the same side as this pillar, and the other end of the separator fixed to the one pillar is Passing through the fixing long holes provided in the support, fixing the separator to the support with the separator flange and the form tie, and forming a frame by the support and the separator on both sides facing each other; (9) With the same rib A plurality of reinforcing posts are arranged at predetermined intervals between the struts arranged on the lath plate side, temporarily fixed to the ribbed lath plate with a binding wire, and a wire separator is hung between opposing reinforcing struts and tightened. And (10) a step of tightening the thick side material using a foam tie to stiffen the whole.