JP2001140221A - Repair method for overhanging floor slab, and support construction for form - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit repair work only from the top of a road or bridge to be repaired. SOLUTION: This repair work comprises a process for demolishing an overhanging floor slab at the outer side of a concrete main body 1, a next process for fixing a form supporting member 3 to the side surface 2 of the concrete main body 1, fixing a supporting member 6 for cantilever support rod to the floor surface 5 of the concrete main body 1, supporting one end side of the form 10 with a form support member 3, supporting the places far from one end side of the form 10 to the other side vat one end side of threaded bolts 18 and supporting the form 10 with the all-threaded bolts 18 in a cantilevered state by connecting the other end side of the bolt 18 to the supporting member 6 for the cantilever supporting rod, thereafter, a process for filling concrete inside the form 10, and hardening the concrete; and thereafter a process in which the supporting member 3 for form, supporting member 6 for cantilever supporting rod and the forms 10 are removed, a portion projecting out from the concrete of the all-threaded bolt 18 is cut.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing an overhang slab such as an aged highway or a bridge and rebuilding the overhang slab, and supporting a formwork used in the repair method. Regarding the structure.

[0002]

2. Description of the Related Art When an expressway, a bridge or the like is deteriorated, it is necessary to recast concrete. In this case, a conventional method of repairing an overhanging floor slab will be described. For example, as shown in FIG. 8, on a viaduct highway, a concrete body 52 forming a road 51 is installed on a pier 50, and an overhanging floor slab 52a of the concrete body 52 is demolished. Next, as shown in FIG. 9, a plurality of columns 53 are installed in a space below the demolished overhanging floor slab 52a, and the form 5 is placed on the columns 53.
4 is installed. Then, concrete 55 is poured into the formwork 54. After the concrete 55 has solidified, the columns 53 and the formwork 54 are removed, and the process is completed.

[0003]

However, in the conventional method of repairing an overhang slab, since the formwork 54 is supported by the supports 53, the space under the overhang slab 52a is supported by the supports 53 during the repair work. Will close it. Therefore, as shown in FIGS. 8 and 9, there is a problem that when the road 56 is below, traffic is hindered. In addition, when there is a repair point at a position higher than the ground such as the lower road 56, the repair work itself becomes extremely difficult.

Accordingly, the present invention has been made to solve the above-mentioned problem, and has excellent workability in which a repair work can be performed only from above a repaired road or bridge without blocking a road or the like under repair. It is an object of the present invention to provide a method of repairing an overhang floor slab and a support structure for a formwork used in the method of repair.

[0005]

According to a first aspect of the present invention, there is provided a method for repairing an overhanging slab in which a concrete overhanging slab is attached to a side surface of a concrete body. And a support member for a cantilever support rod is fixed to the floor surface of the concrete body, one end of the form is supported by the form support member, and the other end is separated from one end of the form to the other side. The form is supported by one end of the cantilevered support rod, and the other end of the cantilevered support rod is connected to the support member for the cantilevered support rod. A mold forming step of suspending and supporting the concrete, and after the mold forming step, concrete is poured into the mold and a concrete forming step of solidifying the concrete, and after the concrete forming step Removing the mold support member, the cantilever support rod support member, and the mold, and performing a support rod process for treating the cantilever support rod so that it does not protrude from concrete. It is characterized by the following.

In this method of repairing an overhanging floor slab, a formwork that is installed so as to overhang from the side surface of the concrete body is suspended and supported in a cantilever manner by a cantilever support rod.

According to a second aspect of the present invention, in the method of repairing an overhang floor slab according to the first aspect, the support rod treatment is performed by:
The present invention is characterized in that the cantilever support rod is cut off a portion protruding from concrete.

In this method of repairing the overhanging floor slab, in addition to the effect of the first aspect of the present invention, the cantilever support rod may be cut, and the cantilever support rod remains in the concrete.

According to a third aspect of the present invention, in the method for repairing an overhanging floor slab according to the first aspect, the cantilevered support rod used is one inserted into a cylinder. After the cantilevered support rod is pulled out of the cylinder, the cylinder is filled with concrete.

In this method of repairing the overhanging floor slab, the cantilever support rod is also removed in addition to the function of the first aspect of the present invention.

According to a fourth aspect of the present invention, in the method for repairing an overhanging floor slab according to any one of the first to third aspects, the cantilevered support rod has a thread portion formed with a threaded portion over its entire length. It is characterized by being.

In this method of repairing an overhang floor slab, the method of claim 1
In addition to the effect of the third aspect of the present invention, the angle of the inclined support of the formwork by the cantilevered support rod can be freely changed by adjusting the screwing position into the screw portion.

According to a fifth aspect of the present invention, there is provided a support structure for a formwork in which a concrete slab is attached to a side surface of a concrete body, wherein a support member for the formwork is fixed to a side surface of the concrete body. A support member for a cantilever support rod is fixed to a floor surface, one end of the form is supported by the support member for the form, and one end of the cantilever support rod is separated from one end of the form to the other side. And the other end of the cantilever support rod is connected to the support member for the cantilever support rod, whereby the formwork is suspended and supported by the cantilever support rod in a cantilever state. And

In this supporting structure for a formwork, the formwork installed so as to project from the side surface of the concrete body is suspended and supported in a cantilever state by a cantilever support rod.

According to a sixth aspect of the present invention, in the form supporting structure of the fifth aspect, the cantilever support rod is formed by a steel rod having a threaded portion.

In this structure for supporting a formwork, in addition to the function of the invention of claim 5, the inclined support angle of the formwork by the cantilever support rod is adjusted by adjusting the screwing position into the threaded portion formed on the steel rod. Can be freely changed.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

<Form Support Structure> FIGS. 1 to 5 show a first embodiment of the present invention. FIG. 1 is a side view of the form support structure.
2 is a perspective view of a support structure of the mold, FIG. 3 is a cross-sectional view of a main part of the mold, FIG. 4 (a) is a plan view of a support member for a cantilever support rod, FIG. FIG. 5A is a perspective view of a supporting square pipe, and FIG. 5B is an exploded perspective view thereof.

First, the support structure of the mold will be described. Figure 1
In FIG. 5, form support members 3 are fixed to the side surface 2 of the concrete body 1 at predetermined intervals along two different height positions. The form support member 3 is substantially L-shaped, and is fixed to the concrete body 1 by concrete anchor bolts 4 as shown in detail in FIG.

On the floor 5 of the concrete body 1, the side 2
The support members 6 for cantilever support rods are fixed at predetermined intervals at a nearby position. Support member 6 for cantilever support rod
As shown in detail in FIG. 4, the bottom plate 7 includes a bottom plate 7, an inclined surface 8 inclined and fixed thereon, and a reinforcing plate 25 for firmly fixing the inclined surface 8. 8, bolt insertion holes 7a and 8a are provided at appropriate positions. The cantilever support rod support member 6 is fixed to the concrete body 1 by concrete anchor bolts 9 inserted into bolt insertion holes 7a in the bottom surface portion 7.

The formwork 10 includes a steel frame 11 and an L-shaped angle 12.
Iron skeleton structure 14 assembled in a lattice with the steel and the square bar 13
The floor side is composed of a wood lattice structure 16 arranged on the iron skeleton structure 14 and assembled in a grid pattern with a crosspiece 15 and a dam 17 laid on the wood lattice structure 16. I have. The iron skeleton structure 13 is a substantially U-shaped steel frame 1.
A plurality of a pair of steel frames 11 are arranged at predetermined intervals in a back-to-back arrangement at predetermined intervals, and an L-shaped angle 12 is formed so as to cross the pair of steel frames 11 at the plurality of locations. A plurality of steel frames 11 are arranged at predetermined intervals.
And the L-shaped angle 12 are fixed by welding. And the square | wood member 13 is arrange | positioned along each L-shaped angle 12, respectively.

One end of the thus configured mold 10 is placed and supported on the mold support member 3. Specifically, as shown in FIG. 3, one end of each steel frame 11 is placed on the lower mold support member 3, and one end of the crosspiece 15 is placed on the upper mold support member 3. Have been. At a position separated from one end side to the other end side of the mold 10, one end of a plurality of cantilevered support rods, which are a plurality of cantilevered support rods arranged at predetermined intervals, is supported as described below. The other end of 18 is connected to the cantilever support rod support member 6 as described below. That is, the formwork 10 is suspended and supported in a cantilever state by the plurality of full screw bolts 18 with respect to the concrete body 1.

Each full screw bolt 1 which is a cantilever support rod
Reference numeral 8 denotes a bolt formed of a steel rod having a threaded portion 18a formed over its entire length, as shown in FIGS. 1 and 2, and a pair of steel frames 11, 11 having one end fixed by an L-shaped angle 12. Each is inserted in the gap between them. A supporting square pipe 19 and a nut 20 are fixed to a portion of the full screw bolt 18 projecting below the gap between the pair of steel frames 11, 11. 18 supports the mold 10. The supporting square pipe 19 is shown in FIGS.
As shown in detail in FIG. 1, a square frame 21 having one end face in contact with the lower surface of the steel frame 11, 11 formed as an inclined end face 21a.
And the bottom plate 2 fixed to the other end surface of the square frame body 21 by welding.
2, and a bolt insertion hole 22 a is formed in the bottom plate 22. The nut 20 is screwed into the full screw bolt 18 protruding from the bolt insertion hole 22a,
End surface 21a of supporting square pipe 19 fixed at position
Is in contact with the lower surface of the steel frame 11.

The other end of each full screw bolt 18 is inserted into a bolt insertion hole 7a of the cantilever support rod support member 6, and a nut 23 is screwed into the full screw bolt 18 protruding from the bolt insertion hole 17a. The other end of the full screw bolt 18 is connected to the support member 6 for the cantilever support rod via the nut 23.

As described above, since the full threaded bolt 18 is used as the cantilever support rod, the fastening position of the nuts 20 and 23 is adjusted so that the entire distance between the support member 6 for cantilever support rod and the square pipe 19 for support is adjusted. By changing the length of the screw bolt 18, the entire screw bolt 18 is
, That is, the tilt support angle θ of the mold 10 shown in FIG. 1 can be freely changed.

<Repairing method of overhang floor slab> Next, a repairing method using the above-described form supporting structure will be described. An example of repairing an overhanging deck of a viaduct road or bridge will be described. The overhanging slab located outside the concrete body 1 forming the road is demolished (overhanging slab removal step). Next, as shown in FIGS. 1 and 2, the above-described formwork 10 is installed in the space of the demolished floor slab.

That is, the form supporting member 3 is fixed to the side surface 2 of the concrete body 1 at a proper position by the concrete anchor bolt 4.
The support member 6 for a cantilever support rod is fixed in place on the floor surface 5 of the concrete body 1 by a concrete anchor bolt 9. Then, one end side of the assembled form 10 is supported by the form support member 3, and a full screw bolt 18 is inserted into a gap between the steel frames 11 of the form 10.
, And one end side of each full screw bolt 18 is fixed with a nut 20 via a supporting square pipe 19. Further, the other end side of each full screw bolt 18 is fixed to the support member 6 for the cantilever support rod with the nut 23 to support the mold 10 in a cantilever state (mold forming step).

Next, concrete is poured into the formwork 10 and the concrete is waited for it to solidify (concrete forming step). Generally, a predetermined steel frame is arranged in concrete.

Next, as shown by a broken line in FIG. 1, a wall panel 24 is formed on the side of the overhanging floor slab. Next, the mold 10, the mold support member 3, and the cantilever support rod support member 6 are removed. In addition, a support rod process for cutting (specifically, cutting at positions A and B in FIG. 1) a portion of each of the screw bolts 18 protruding from the concrete is performed (form removing step), and the process is completed. I do.

In the above-mentioned method of repairing the overhanging floor slab, the formwork 10 installed so as to project from the side face 2 of the concrete body 1 is supported by being suspended in a cantilever state with all the screw bolts 18. Repair work can be performed only from the top of the road or bridge to be repaired without blocking the road below.

In the first embodiment, since the support rod treatment is a treatment for cutting the portion of the full screw bolt 18 protruding from the concrete, the working efficiency is high, and
Further, since the entire screw bolt 18 remains in the concrete, there is an advantage that it contributes to reinforcement of the concrete.

<Other Embodiments> FIGS. 6 and 7 show a second embodiment of the present invention. FIG. 6 is a side view of a supporting structure of the mold 10, and FIG. It is a perspective view showing the state where it did. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals in the drawings, and the description thereof will be omitted. Only different components will be described.

That is, in the second embodiment, as in the first embodiment, the all-screw bolt 18 is used as a cantilever support rod.
However, as shown in FIG. 7, the full screw bolt 18 is used in a state of being inserted into a protection pipe 30 made of vinyl chloride, which is a cylindrical body.

The repair method is also substantially the same as that of the first embodiment, except for the support rod processing in the mold removing step. In other words, as the support rod processing, the protection pipe 3
This is to pull out all screw bolts 18 from 0 and to fill the protection pipe 30 with concrete. Therefore,
In the second embodiment, the mold 10, the support member 3 for the mold,
Since all the screw bolts 18 as well as the support member 6 for the cantilever support rod are removed, there is an advantage that all the screw bolts 18 can be reused.

Further, as a modified example of the second embodiment, a screw in which paper is wound around the entire screw bolt 18 may be used, and the solid screw bolt 18 may be pulled out from the paper after the concrete is solidified. That is, paper is used as the cylindrical body, and the cost is lower than when the protective pulp 30 is used.

According to the first and second embodiments, the all-screw bolt 18 is used as the cantilever support rod. However, any bolt that can support the mold 10 in a cantilever state can be used. However, when the full screw bolt 18 is used as described above, there is an advantage that the inclined support angle θ of the mold 10 can be freely changed. The same effect can be expected with a bolt having a thread portion only over a certain range on both ends as a cantilevered support rod.

According to the first and second embodiments, the support between the full screw bolt 18 and the mold 10 is made by the supporting square pipe 19.
And the nut 20, and the connection between the full screw bolt 18 and the floor surface 5 of the concrete body 1 was performed by the cantilever support rod support member 6 and the nut 23, but the cantilever support rod (full screw bolt 18) and the mold were used. The structure for supporting the frame 10 and the structure for connecting the cantilever support rod (full screw bolt 18) to the floor surface 5 of the concrete body 1 are not limited to those of the first and second embodiments, and various structures are conceivable. .

According to the first and second embodiments, the case where the present invention is applied to a method of repairing an overhang slab of a viaduct road or bridge has been described. The present invention can be applied to general repair of parts protruding from the main body.

[0039]

As described above, according to the first aspect of the present invention, the support member for the formwork is fixed to the side surface of the concrete body, and the support member for the cantilever support rod is fixed to the floor surface of the concrete body. The support member for the form supports one end of the form, and a portion separated from the one end of the form to the other side is supported by one end of the cantilever support rod. A mold forming step of supporting the mold in a cantilevered state with the cantilever support rod by connecting an end side to the support member for the cantilever support rod, and after the mold forming step, the mold is formed. Concrete forming step of injecting concrete into the frame and solidifying the concrete, and after this concrete forming step, removing the form support member, the cantilever support rod support member and the form form Both of them comprise a formwork removing step of performing a support rod treatment for treating the cantilevered support rod so as not to protrude from concrete, so that the formwork installed so as to project from the side of the concrete body is a cantilevered support rod. Since it is suspended and supported in a cantilever state, repair work can be performed only from the top of the repaired road or bridge without blocking the lower road or the like to be repaired.

According to the second aspect of the present invention, in the method of repairing an overhang floor slab according to the first aspect, the supporting rod processing is a processing of cutting a portion of the cantilever supporting rod projecting from concrete. Therefore, in addition to the effect of the first aspect of the present invention, the cantilevered support rod may be cut, and the cantilevered support rod remains in the concrete, so that work efficiency is improved and contributes to concrete reinforcement.

According to the third aspect of the present invention, in the method for repairing an overhanging floor slab according to the first aspect, the cantilevered support rod used is one inserted into a cylindrical body, and the support rod treatment is performed. After the cantilevered support rod is pulled out of the cylinder, the cylinder is filled with concrete. In addition to the effect of the invention of claim 1, the cantilevered support rod is also removed, so that the cantilevered support rod is removed. The rod can be reused.

According to the fourth aspect of the present invention, in the method of repairing an overhanging slab according to any one of the first to third aspects, the cantilever support rod has a threaded portion formed over its entire length. Since it is a screw bolt, in addition to the effects of the first to third aspects of the present invention, it is possible to freely change the inclination support angle of the mold by the cantilever support rod by adjusting the screwing position into the screw portion. Applicable to repair work under conditions.

According to the fifth aspect of the present invention, a support member for a formwork is fixed to a side surface of the concrete body, and a support member for a cantilever support rod is fixed to a floor surface of the concrete body. A member supports one end of the formwork, and a portion away from one end of the formwork to the other side is supported by one end of the cantilever support rod, and the other end of the cantilever support rod is supported by the cantilever. Since the formwork is suspended and supported by the cantilevered support rod in a cantilever state by being connected to a rod supporting member, the formwork installed so as to project from the side of the concrete body is the cantilevered support rod. The cantilever is supported in a cantilevered state, so that repair work can be performed only from the top of the repaired road or bridge without blocking the lower road or the like to be repaired.

According to the sixth aspect of the present invention, in the form supporting structure according to the fifth aspect, since the cantilever support rod is formed by a steel rod having a screw portion,
In addition to the effects of the invention of claim 5, since the tilt support angle of the formwork by the cantilevered support rod can be freely changed by adjusting the screwing position to the threaded portion formed on the steel rod, various conditions are repaired. Applicable to construction.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the present invention and is a side view of a support structure of a mold.

FIG. 2 shows the first embodiment of the present invention, and is a perspective view of a support structure for a mold.

FIG. 3 shows the first embodiment of the present invention and is a cross-sectional view of a main part of a mold.

4A and 4B show a first embodiment of the present invention, wherein FIG. 4A is a plan view of a support member for a cantilever support rod, and FIG. 4B is a front view thereof.

5A and 5B show a first embodiment of the present invention, wherein FIG. 5A is a perspective view of a supporting square pipe, and FIG. 5B is an exploded perspective view thereof.

FIG. 6 shows a second embodiment of the present invention and is a side view of a support structure for a mold.

FIG. 7 is a perspective view showing the second embodiment of the present invention, and showing a state in which all screw bolts are inserted into a protection pipe.

FIG. 8 is a view showing a viaduct road for explaining a conventional repair method.

FIG. 9 is a view showing a supporting structure of a mold for explaining a conventional repair method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete main body 2 Side surface 3 Support member for formwork 5 Floor surface 6 Support member for cantilever support rod 10 Formwork 18 Full screw bolt (cantilever support rod) 30 Protective pipe (tubular body)

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Akira Okubo 3-12-12 Minamiota, Minami-ku, Yokohama-shi, Kanagawa F-term in Apex Corporation (reference) 2D059 AA14 BB37 BB39 CC04 DD08 DD15 GG39 GG55

Claims (6)

[Claims] 1. A method for repairing an overhanging slab in which a concrete overhanging slab is attached to a side surface of a concrete body, wherein a support member for formwork is fixed to a side surface of the concrete body, and The support member for the cantilever support rod is fixed, and one end of the form is supported by the support member for the form, and a portion away from one end of the form to the other side is supported by one end of the cantilever support rod. A formwork forming step of supporting the formwork in a cantilevered manner by the cantilevered support rod by connecting the other end of the cantilevered support rod to the support member for the cantilevered support rod, After this form forming step, concrete is poured into the form and the concrete forming step of solidifying the concrete; and after the concrete forming step, the form supporting member;
A formwork removing step of removing the cantilevered support rod support member and the formwork, and performing a support rod treatment for treating the cantilevered support rods so as not to project from concrete. Plate repair method. 2. The method for repairing an overhanging slab according to claim 1, wherein the support rod treatment is a treatment for cutting a portion of the cantilever support rod projecting from concrete. Repair method of overhang floor slab. 3. The method for repairing an overhanging slab according to claim 1, wherein the cantilevered support rod is inserted into a cylinder, and the support rod treatment is performed using the cantilevered support rod. Repairing the overhanging floor slab, which comprises extracting concrete from the cylinder and then filling the cylinder with concrete. 4. The method for repairing an overhanging floor slab according to claim 1, wherein the cantilever support rod is a full screw bolt having a thread portion formed over the entire length. Repair method of overhang floor slab. 5. A supporting structure for a formwork in which a concrete overhanging floor slab is attached to a side surface of a concrete body, a formwork supporting member is fixed to a side surface of the concrete body, and a cantilever is provided on the floor surface of the concrete body. Fixing the support member for the support rod, supporting the one end side of the mold to the support member for the form and supporting the one side of the cantilever support rod at a position separated from the one end of the form to the other side, By connecting the other end of the cantilever support rod to the support member for the cantilever support rod, the form is suspended and supported by the cantilever support rod in a cantilever state. Support structure. 6. The support structure for a formwork according to claim 5, wherein the cantilever support rod is formed by a steel rod having a threaded portion.