JPH09158496A - Concrete formwork construction method to reinforce existing pillar type structure and its formwork device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply, certainly and economically carry out concrete formwork construction to reinforce an existing pillar type structure. SOLUTION: Concrete is continuously deposited by arranging a pair of half part formwork bodies A, A connecting two pieces of surface formworks 1a, 1b provided with a plural number of interval adjusting rods 31, 31 free to adjust them to get in and out with intervals in the lateral direction and in the vertical direction in the circumference of an existing pillar type structure B, setting head ends of the interval adjusting rods 31, 31 by keeping a required clearance (a) by making them contact with a side surface of the existing pillar type structure B and removing the interval adjusting rods 31, 31 after depositing reinforced concretes C-C3 to a lower position near the interval adjusting rods 31, 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a formwork construction method for reinforcing concrete around an existing columnar structure such as concrete, and a formwork apparatus used therefor.

[0002]

2. Description of the Related Art As countermeasures against earthquakes and the like, reinforcement has been made to deteriorated columnar structures and columnar structures requiring reinforcement. For this reinforcement, generally, a method of placing concrete of a required thickness around the prefabricated pillar structure is adopted, and the formwork construction in this case is the conventional concrete pillar structure construction. Similarly to the above, each surface formwork along the outer peripheral surface of the concrete to be constructed is connected to the existing structure while maintaining a predetermined interval, and the concrete is cast.

[0003]

However, in such formwork construction, not only a lot of time and skill are required to set the formwork on each surface by tightening each other, but also the existing structure and the formwork are used. The problem is how to maintain the gap between the two, and the technical problem is to improve the method and the formwork device which have good workability and can be economically and quickly constructed.

The present invention has been made to solve the above-mentioned problems, and can easily and surely set and reset the formwork and maintain the space between the formwork and the existing structure and the concrete to be constructed. Provide a method of concrete formwork construction to reinforce existing columnar structures and its formwork device, which can be widely applied to various objects of different sizes with a slight adjustment work, and is highly economical Is what you are trying to do.

[0005]

The structure of the present invention for solving the above problems will be described with reference to the drawings corresponding to the embodiments. A plurality of distance adjusting rods 31, 31 are spaced in the direction,
Formwork device A, A provided inside the formwork to be adjustable in and out
When the tip ends of the space adjusting rods 31 and 31 are brought into contact with the side surface of the existing columnar structure B, the structure B is installed with a required space a, and concrete is placed in the space a. ,
Concrete C to C _{3 to the} position below the space adjusting rods 31
After pouring, the interval adjusting rods 31 and 31 are removed from within the interval a, and concrete is spliced.

Further, the formwork apparatus of claim 2 comprises a pair of half formwork bodies A, A formed by hinge-connecting two surface formwork 10, 10 to each other. A is each surface form 1
A plurality of distance adjusting rods 31 and 31 are provided at intervals in the horizontal and vertical directions of a and 1a so as to be adjustable in and out of the inside of the mold, and the horizontal flaps of the respective surface molds 1a and 1b Material 3
A reinforcing truss 20 is provided on the outer side of a and 3b, and the pair of half formwork bodies A and A are connected to each other so that they can be adjusted laterally and are separable from each other. It is what

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. First, the formwork apparatus used in the construction method of the present invention will be described. The formwork device includes a pair of half mold forms A, which are connectable and separable from each other.
It is composed of A.

In the half-frame A, two surface molds 1a and 1b along one surface of a columnar concrete structure B to be constructed and the surfaces adjacent to the one are rotatably movable around a vertical axis at one end. The surface molds 1a and 1b, which are formed by coupling 2, are formed in the same manner as the conventional general molds, and the horizontal flaps 3a and 3a (3b and 3a) are arranged at intervals in the vertical direction.
b) is joined by the vertical flap materials 4 and 4, and the horizontal flap materials 3a and 3
It has a structure in which the dam 5 is attached to the inside of a (3b, 3b) (concrete pouring side).

Then, the one-sided mold 1a of the half mold A
The horizontal flap materials 3a, 3b of the other are attached to the other surface formwork 1 on one end side thereof.
Holes 6 and 6 for connecting the horizontal flap material 3b of b and the diagonal member 22 of the reinforcement truss 20 described later are provided at intervals in the longitudinal direction of the horizontal flap material 3a. A bracket 7 is projectingly provided on the other end of the lateral flap 3a, and a screw rod 8 is pivotally attached to the bracket 7.
Have been.

An attachment plate 10 is provided at one end of each of the lateral flap members 3b and 3b of the other surface form 1b of the half-form frame A, and depending on the location of the attachment plate 10, the connecting hole is formed. At any one of the positions 6 and 6, the shaft 2 (not shown) such as a bolt is connected to the lateral flap 3a so as to be rotatable and separable. Further, at the other end side of the lateral flap material 3b, holes 6, 6 for coupling with a diagonal member 22 of a reinforcing truss 20 described later are provided, and the outer surface portion of the lateral flap material 3b is provided with the above-mentioned screw. A number of chevron-shaped brackets 12 (see FIG. 4) having insertion holes 13 for the rods 8 are provided in the longitudinal direction of the lateral flap 3b by means of bolts and nuts 14 and 14 through a plurality of coupling holes 11 and 11 which are spaced apart from each other. It is adjustable.

A reinforcing truss 20 projecting outward is provided on each of the lateral flap members 3a, 3b. Reinforced truss 20
Is a horizontal flap material 3a (3
b) Reinforcement and reverse bending corresponding to the pressure of the placing concrete (the bending in the direction opposite to the bending of the form swelling outward due to the placing pressure of concrete), and the role of expanding and contracting the mechanism. A pair of diagonal members 2 at one end of an upright bracing member 21 provided with
One end of each of 2, 2 is pivotally connected 23 to each other.

As shown in FIG. 5, the expansion and contraction mechanism of the upholstery member 21 has a structure in which an outer screw 24 is formed on the other end side of the upholstery member 21 and a nut 25 is screwed into it. Upholstery material 21
The other end of the horizontal flap 3a (3b) is appropriately projected, and the nut 25 is screwed to be pressed against the outer surface of the horizontal flap 3a (3b). The nut 25 is pivoted depending on the degree of screwing. The substantial length of the upholstery material 21 from the landing point 23 to the outer surface of the lateral flap material 3a (3b) can be freely expanded and contracted.

The diagonal member 22 is also adjustable in length. For example, as shown in the figure, a member divided into two is used, holes 26, 26 for coupling are separately provided in the respective members, and end portions of the members are overlapped with each other, and bolts and nuts are inserted through both holes 26, 26. (Not shown). Those holes 26, 26
The length of the entire diagonal member 22 is adjusted by selecting

The reinforcing truss 20 of the one lateral flap 3a has the other end of the one diagonal member 22 which is attached to the lateral flap 3a.
The other end portion of the diagonal member 22 is attached to a required portion of the connecting holes 6 and 6 of the horizontal flap member 3a by bolts and nuts (not shown). In addition, the reinforcing truss 20 of the other horizontal flap 3a has the other end of one diagonal member 22 pivotally attached to one end of the horizontal flap 3b 27, and the other end of the other diagonal member 22 has a horizontal flap. The material 3b is attached to the required positions of the coupling holes 6 and 6 by coupling with bolts and nuts (not shown).

In the illustrated embodiment, the connecting holes 6 and 6 are provided.
Is provided on one end side or the other end side of the lateral flap material 3a (3b), but it may be provided on both end sides.
Alternatively, one of the pair of diagonal members 22, 22 may have a fixed length, and only the other one may have its length adjustable.

Each of the above surface molds 1a, 1b has a supporting member of a tubular shape or the like with a required interval in the width direction and the height direction.
30 and 30 are provided alongside the vertical flaps 4 and 4, and the support members 30 and 30 are provided with a space adjusting rod 31 formed long in the transverse direction of the surface molds 1a and 1b. It is removably inserted, and its tip can be projected longer than the through hole 32 provided in the weir board 5 toward the concrete pouring side. Also,
The interval adjusting rod 31 has a plurality of pin holes along its length.
33, 33 are spaced apart, and one of the pin holes 33 is supported by a supporting member.
By inserting a stop pin 34 in line with a pin hole 30 (not shown), the projection length of the interval adjusting rod 31 from the weir plate 5 can be changed and fixed.

As the means for attaching / detaching the distance adjusting rod 31 and adjusting the protruding length, other known means can be applied, and the distance adjusting rod 31 can be finely adjusted by adjusting means such as a screw type. You can also allow it.

The formwork construction method of the present invention is carried out by using the formwork apparatus described above as an example. First, the existing columnar structure B
The reinforcing concrete C necessary for attaching the lower part of the formwork device is constructed around the required height from the ground by the appropriate means. At that time, an anchor (not shown) for fixing the formwork device is embedded, and the lower end portion of each half mold body A is fixed through the anchor to connect the half mold bodies A, A to each other. Assemble.

Prior to that, the respective half mold bodies A, A are assembled. In the assembly, the horizontal flap material 3 of the other surface form 1b is attached to one end of the horizontal flap material 3a of the one surface mold 1a.
The ends of b are joined, and the joining points are joined depending on the size of one side of the reinforcing concrete C by appropriately selecting the ends or the places of the joining holes 6 and 6 as shown in the drawing. To do. Further, in the other flap material 3b, the mounting position of the bracket 12 is adjusted according to the size of the corresponding side of the structure to be constructed. The adjustment is through the coupling hole 1
It is performed by appropriately selecting 1 and 11.

In the reinforcing truss 20 of the lateral flaps 3a, 3b, one diagonal member 22 is pin-connected 27 to the end of the lateral flap member 3a (3b), and the other diagonal member 22 is the lateral flap members 3a, 3b. The connection holes 6 and 6 located inward from the connection point 2 or the mounting position of the bracket 12 are properly connected. At that time, the length of the diagonal member 22 is appropriately adjusted. Also, the upholstery material 21
Has its tip portion penetrated into the lateral flap material 3a (3b),
Turn the nut 25 to adjust its length, and then the nut 25
Is screwed to give the transverse flap material 3a (3b) a reverse deflection corresponding to the pressure of the cast concrete.

A pair of half-frames A, A, whose lower end is fixed to the reinforced concrete C, includes a screw rod 8 provided on the transverse flap 3a and a bracket 12 provided on the opposite transverse flap 3b. It is inserted into the insertion hole 13 and a nut 35 is screwed and tightened. As a result, the entire formwork apparatus can be assembled. Then, the supporting member 3 of each surface form 1a, 1b
Inserting the space adjusting rod 31 into 0 and 30, projecting a required length thereof, and applying the tip thereof to the side surface of the existing columnar structure B,
The stop pin 34 is inserted and fixed in the pin hole 33, and the distance from the existing columnar structure B to the weir plate 5 is set to the peripheral and upper and lower required equal intervals a.

Reinforcing bars are appropriately arranged in the space a between the existing columnar structure B and the dam. The concrete is poured into the space a in a stepwise manner in the vertical direction. First, the reinforced concrete C ₁ is moved to a position slightly below the space adjusting rods 31, 31 at the bottom.
Is installed. Then, the bottommost interval adjusting rods 31, 31 are pulled out from the inside of the interval a by pulling out the stop pin 34, or the supporting member 30
Remove more. Then Da設reinforcing concrete C ₂ to just below the gap adjusting rod 31, 31 in the next upper row, escape or remove the gap adjustment rod 31, pouring of reinforced concrete C ₃ in the same manner And the space adjusting rods 31 and 31 are ejected or removed.

After the cast reinforcement concrete C ₃ is hardened, the nuts 35, 35 fastening the half molds A, A are loosened to separate the surface molds 1a, 1b from the concrete.
At that time, each surface formwork 1a, 1b will bulge and bend inward due to the return action of the reinforcing truss 20 by imparting the reverse deflection, and the formwork can be peeled off from the concrete satisfactorily. . After that, attach the screw rods 8, 8 to the bracket 12,
Escape from 12 and the half molds A and A will be separated from each other and removed. And, those half mold bodies A,
A is fixed and assembled to the reinforced concrete C ₃ again in the same manner as at the beginning, and the construction of the reinforced concrete is repeated by sequentially placing the reinforced concrete upward.

In the present invention, as in the above embodiment,
The present invention is not limited to the construction of reinforced concrete having a quadrangular cross section, and can be widely applied to various shapes such as polygons, circles, and ellipses. Further, the mold device used is not limited to that of the above-mentioned embodiment, and any conventionally known mold device may be used as long as the interval adjusting rods 31, 31 are detachably attached and the projecting length is adjustable. Can be used.

[0025]

As described above, according to the present invention,
The formwork device for constructing the reinforced concrete of the existing structure can be installed easily and surely with the required space from the existing columnar structure, the reinforced concrete can be constructed efficiently, and the space adjustment rod can be moved in and out. As a result, it is possible to widely and easily deal with the construction of various reinforced concretes having different thicknesses, and the construction economical efficiency is good.

Further, the formwork device is a device for connecting a pair of half formwork bodies in which two surface formworks are hingedly connected, and moreover, since the formwork is adjustable in its lateral direction, The frame can be set and reset easily and efficiently, it can be widely used for various things with different cross-sectional dimensions, and the reinforcement truss is provided, so that the main transverse flap has a small cross-section. Since it can be used, the cost of formwork can be greatly reduced, and the economical efficiency of formwork is further improved.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing a mode of construction according to the present invention.

FIG. 2 is a plan view showing an embodiment of the formwork apparatus according to the present invention.

FIG. 3 is a plan view showing a pair of half mold bodies separately.

FIG. 4 is a partially cutaway plan view showing a connecting portion between half mold bodies.

FIG. 5 is a partially cutaway plan view showing a projecting material portion of a reinforcing truss.

[Explanation of symbols]

A Half-form frame B Existing columnar structure C, C ₁ , C ₂ , C ₃ Reinforced concrete 1a, 1b Surface form 2 Joining part 3a, 3b Horizontal flap material 4 Vertical flap material 5 Weir board 6 Connection hole 8 Screw rod 11 Coupling hole 12 Bracket 13 Insertion hole 20 Reinforcement truss 21 Reinforcement member 22 Oblique member 30 Support member 31 Spacing adjustment rod 32 Through hole 33 Pin hole 34 Stop pin 35 Nut

Claims (2)

[Claims] 1. A formwork device in which a plurality of space adjusting rods are provided at intervals in the horizontal direction and the vertical direction so as to be adjustable in and out of a formwork, and a tip of the space adjusting rod has an existing columnar structure. When the concrete is placed in contact with the side surface of the object while maintaining a required gap with the structure, and concrete is placed within the gap, after placing the concrete to a position below the gap adjusting rod, the gap adjusting rod is placed. The concrete formwork construction method to reinforce the existing columnar structure, characterized in that the concrete is removed from within the interval and the concrete is spliced. 2. A pair of half molds formed by hinge-bonding two surface molds to each other, wherein the half molds are spaced in the lateral and vertical directions of each mold. In addition, a plurality of gap adjusting rods are provided inside the formwork to be adjustable in and out, and a reinforcing truss is provided outside the lateral flap material of each surface formwork. A concrete formwork device for reinforcing an existing columnar structure, characterized in that a pair of the above are connected to each other so as to be adjustable in the lateral direction and separable from each other.