JP2005133378A - Mounting structure and mounting method for embedded form in method of repairing/reinforcing concrete structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure and a mounting method for an embedded form in a method of repairing/reinforcing a concrete structure having excellent workability, functionality and economical efficiency without requiring expert skill for work. <P>SOLUTION: In this mounting structure for the embedded form, a fiber mat 2 is disposed on a repaired/reinforced surface of the concrete structure 1, and the embedded form is mounted to hold the fiber mat 2 between the repaired/reinforced surface and the embedded form. The embedded form is composed of a plurality of adjusting form boards 3 fixed in parallel with spaces to the repaired/reinforced surface, and main form boards 4 installed respectively between the mutually adjacent adjusting form boards 3. The main form board 4 is installed so that both edge parts overlap with the respective edge parts of the mutually adjacent adjusting form boards 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a mounting structure and a mounting method for an embedded formwork in a repair / reinforcement method for a concrete structure, and more particularly, a cement mat solidified by placing a fiber mat between a repair / reinforcement surface and an embedded formwork. The present invention relates to a method for injecting a material and attaching an embedded formwork to a repair / reinforcement surface.

  Various methods for repairing and reinforcing concrete structures have been proposed, such as attaching steel plates to concrete surfaces, spraying polymer-based high-strength concrete, and spraying concrete or mortar mixed with short fibers. Under such technical background, the applicant of this application first arranges the fiber mat on the repair / reinforcement surface of the concrete structure, and inserts the fiber mat between the repair / reinforcement surface. Has proposed a new construction method in which an embedded formwork is installed and cemented solidifying material such as cement milk or cement mortar is injected into the closed space formed between the repair / reinforcement surface and the embedded formwork ( Patent Document 1).

  In this method, the buried form is generally attached to the repair / reinforcement surface of the concrete structure as follows. That is, a plurality of anchors are driven at predetermined intervals on the repair / reinforcement surface, and dimension bolts are attached to the anchors. Install a fiber mat on the repair / reinforcement surface, and temporarily fix it to the cutting bolt. Holes are provided in advance on the mold board at positions corresponding to the anchors. Each dimension bolt is passed through these holes, and support materials are attached via these dimension bolts to hold the mold in place. doing.

Usually, a plurality of formwork boards are used, and the plurality of boards are installed so that the end portions thereof are abutted. For this reason, each board cannot be attached to a predetermined position unless the anchor is placed with high accuracy. For this reason, there has been a problem that high accuracy is required for placing the anchor, and thus skill is required for the operation. Moreover, since work requires time, there existed a problem that workability, functionality, and economical efficiency were inferior.
JP 2003-49544 A

The present invention has been made based on the technical background as described above, and achieves the following object.
An object of the present invention is to provide an embedded formwork mounting structure and a mounting method in a concrete structure repair / reinforcement method that does not require skilled skills for work and is excellent in workability, functionality, and economy. .

The present invention employs the following means in order to achieve the above object.
That is, the present invention provides a mounting structure for an embedded form in which a fiber mat is disposed on a repair / reinforcement surface of a concrete structure and the embedded form is attached so that the fiber mat is sandwiched between the repair / reinforcement surface. Because
The embedded formwork includes a plurality of adjustment formwork boards fixed in parallel to the repair / reinforcement surface at intervals, and a main formwork board installed between the adjustment formwork boards adjacent to each other. Configured,
The main formwork board is installed so that both end edges thereof overlap each end edge part of the adjustment formwork board adjacent to each other. In the mounting structure.

The present invention also relates to a method for attaching an embedded formwork, the first of which is that a plurality of base plates provided with a plurality of internal thread portions spaced in one direction are provided on the repair / reinforcement surface of a concrete structure. Placing and fixing in parallel,
A step of attaching a dimensioning bolt having a height adjustment nut matched to the reinforcement thickness to each female thread part;
A process of placing fiber mats on the concrete repair / reinforcement surface;
Passing the adjustment formwork board through the dimensioning bolts of each base plate and sandwiching the adjustment formwork board between the height adjustment nut and the holding nut attached to the dimensioning bolt; and
A step of installing the main formwork board between the adjustment formwork boards adjacent to each other such that both end edges overlap with the respective end edges of the adjustment formwork board;
There is a method for attaching an embedded formwork in a repair / reinforcement method for a concrete structure including a step of installing a support material on the surface of the main formwork board via the dimension bolt.

Furthermore, in the second aspect of the invention of the method of attaching the embedded formwork, a plurality of base plates provided with a plurality of female screw portions spaced in one direction are arranged in parallel on the repair / reinforcement surface of the concrete structure. Fixing and
Attaching a first cut bolt having a cone matched to the reinforcing thickness to each female thread;
A process of placing fiber mats on the concrete repair / reinforcement surface;
Between the base plates adjacent to each other, installing a main formwork board so as to sandwich the fiber matrix between the repair and reinforcement surfaces;
Attaching a second cutting bolt to the cone;
The adjustment formwork board is passed through the second cutting bolt of each base plate, and both end edges thereof are overlapped with each end edge part of the main formwork board adjacent to each other, and the adjustment formwork board is attached to the cone. And the step of sandwiching and installing between the holding nut attached to the second dimension cutting bolt,
There is a method for attaching an embedded form in a repair / reinforcement method for a concrete structure, which includes a step of installing a support material on the surface of the adjustment form board via the second cutting bolt.

  More specifically, the base plate is fixed to the repair / reinforcement surface by an anchor. A spring member is provided on the back surface of the main formwork board to receive a reaction force from the repair / reinforcement face and press the main formwork board toward the adjustment formwork board.

  According to the present invention, the both end edges of the main formwork board are installed so as to overlap with the respective end edges of the adjustment formwork board, that is, the end faces of the adjacent formwork boards are placed in contact with each other as in the prior art. Therefore, high installation accuracy is not required, and therefore skill is not required for work. For this reason, workability, functionality, and economy are greatly improved.

  FIG. 1 is a plan view showing a state in which an embedded form has been attached, FIG. 2 is a sectional view taken along line AA in FIG. 1, FIG. 3 is an enlarged sectional view taken along line BB in FIG. It is an expanded sectional view which shows the state which removed the support material after hardening of material. This embodiment is an example in which the present invention is applied to the repair and reinforcement of tunnel lining concrete, and the horizontal direction in FIG. 3 is the tunnel extension direction (axial direction).

  First, a structure for mounting an embedded form according to the present invention will be described. The fiber mat 2 installed on the repair / reinforcement surface of the lining concrete 1 is arranged almost uniformly with random orientation and the fibers are entangled three-dimensionally and porous inside. In the appearance, it has a cotton-like or sponge-like shape having a restoring force (refer to Patent Document 1 for details).

  The embedded formwork attached so that the fiber mat 2 is sandwiched between the repair / reinforcement surface of the lining concrete 1 is fixed in parallel to the repair / reinforcement surface at intervals in the tunnel extension direction. It consists of a formwork board 3 and a main formwork board 4 installed between the adjustment formwork boards 3 adjacent to each other.

  The adjusting formwork board 3 and the main formwork board 4 are boards formed by impregnating a fiber mat similar to the above with a cement-based solidifying material such as cement milk or cement mortar and pressing it in advance. Since the embedded form boards 3 and 4 by such fiber reinforcement have high strength and toughness, they can be evaluated as structural members even after repair and reinforcement.

  The adjustment formwork board 3 is fixed to the lining concrete 1 via a fixture (details will be described later) including an anchor 5 and a slicing bolt 6. The main mold board 4 is installed such that both end edges thereof overlap with the respective end edges on the surface side of the adjustment mold board 3 adjacent to each other. The main formwork board 4 is held by a supporting material installed on the surface thereof, that is, a home tie 7 and a single pipe 8 installed via a dimension bolt 6.

  According to the mounting structure of the embedded form as described above, the both end edges of the main formwork board are installed so as to overlap with the respective end edges of the adjustment formwork board, that is, the adjacent formwork as in the prior art. Since it is not installed with the end portions of the board facing each other, high mounting accuracy is not required, and therefore skill is not required for work. For this reason, workability, functionality, and economy are greatly improved.

  Next, a specific method for attaching the embedded form will be described. 5 and 6 are cross-sectional views in the tunnel extension direction showing the method of attaching the buried form for each procedure. The base plate 10 is an elongated member (see also FIG. 2), and a plurality of nuts 11 are provided at intervals in one direction, and a hole for passing the anchor 5 is provided, although not shown. The base plate 10 is aligned with a predetermined position of the repair / reinforcement surface of the lining concrete 1 and fixed by the anchor 5 (FIGS. 5A and 5B). A plurality of base plates 10 are used, and are fixed in parallel at intervals. Instead of the nut 11, a female screw hole may be directly formed in the base plate 10.

  Next, as shown in FIG. 5 (c), the dimensioning bolt 6 is attached to each nut 11. An adjusting nut 14 is attached to the dimensioning bolt 6. By adjusting the mounting position of the adjusting nut 14, it can be adjusted to the reinforcing thickness t.

  Next, as shown in FIG. 5 (d), the fiber mat 2 is installed on the repair / reinforcement surface of the lining concrete 1. The fiber mat 2 is temporarily fixed to the cutting bolt 6 with a wire that does not cause rust, such as a stainless steel wire, at a location where the fiber mat 2 falls due to gravity, such as the top of the tunnel.

  Next, as shown in FIG. 6 (e), for each base plate 10, the adjustment mold board 3 is passed through the dimensioning bolts 6 attached thereto. And this adjustment formwork board 3 is clamped between the holding nut 15 and the adjustment nut 14 which were attached to the cutting bolt 6, and the adjustment formwork board 3 is installed in this way. The fiber mat 2 may be installed after the adjustment formwork board 3 is installed.

  Next, as shown in FIG. 6F, the main formwork board 4 is installed between the adjustment formwork boards 3 and 3 adjacent to each other. The width dimension of the main formwork board 4 is larger than the interval between the adjustment formwork boards 3 and 3, so that both end edges of the main formwork board 4 overlap with the respective end edges of the adjustment formwork boards 3 and 3. . A sealing material 16 is disposed in an overlapping portion between the adjustment formwork board 3 and the main formwork board 4. The main formwork board 4 is provided with a plurality of embedded bolts 17 so as to protrude to the fiber mat 2 side, and this is because the cement-based solidified material injected between the repair / reinforcement surface and the formwork is hardened. After that, the reinforcing layer 18 (see FIG. 4) and the main formwork board 4 are integrated.

  Next, as shown in FIG. 6 (g), after the main formwork board 4 is installed, a plurality of single pipes 8 are arranged on the surface, and the single pipes 8 are attached to the cutting bolts 6. 7 to fix. The main formwork board 4 is held at a predetermined position by the support material. Thereafter, cement-type solidified material such as cement milk or cement mortar is injected into a closed space between the mold board 3 and 4 and the repair / reinforcement surface from an injection hole (not shown) provided in the main mold board 4. The fiber mat 2 is impregnated. Then, after the cement-based solidifying material is hardened, the supporting material such as the home tie 7 and the single pipe 8 is removed, and the portion of the cutting bolt 6 protruding from the adjustment formwork board 3 is cut and removed (see FIG. 4). ).

  The support material is not limited to the home tie 7 or the single pipe 8, but may have another configuration. FIG. 7 is a plan view showing another embodiment in which the support material is different, and FIG. 8 is a sectional view taken along the line CC of FIG. In this embodiment, the supporting material is composed of a plurality of pressing channels 20 arranged on each main formwork board 4 and a stopping channel 21 arranged across the pressing channels 20 adjacent to each other. The stop channel 21 is attached to the cutting bolt 6. Such a support material is applied at a place where the height cannot be increased.

  In the case of the embodiment shown in FIGS. 1 to 6, a step or depression 22 is formed on the surface of the reinforcing layer 18 after completion of construction (see FIG. 4). This level | step difference 22 will cause a turbulent flow, when the tunnel made into construction is a waterway tunnel. Another embodiment in which this step 22 is eliminated is shown in FIG. 9 is a plan view showing a state in which the mounting of the embedded form is completed, FIG. 10 is a sectional view taken along the line DD in FIG. 9, FIG. 11 is an enlarged sectional view taken along the line EE in FIG. It is an expanded sectional view which shows the state which removed the support material after hardening of material.

  As shown in FIG. 11, in this embodiment, the main mold board 4 is installed so that both end edges thereof overlap with the respective end edges on the back side rather than on the front side of the adjusting mold board 3 adjacent to each other. Has been. A spring member 23 is provided on the back surface of the main formwork board 4. The spring member 23 is substantially V-shaped, and is fixed to the main formwork board 4 by an embedded bolt 17 at its base. The two tip portions of the spring member 23 reach the repair / reinforcement surface of the lining concrete 1 and receive the reaction force from the repair / reinforcement surface to press the main formwork board 4 toward the adjustment formwork board 3. Thereby, even if the main formwork board 4 is on the back side of the adjustment formwork board 3, it can be held at a predetermined position.

  The dimensioning bolts constituting the fixture of the adjustment formwork board 3 are composed of a first dimensioning bolt 24 and a second dimensioning bolt 25, and these two dimensioning bolts 24, 25 are connected via a cone 26. The A rubber packing 27 is provided on the back surface of the adjustment formwork board 3. A spacer 29 is interposed between the main formwork board 4 and the single pipe 8 as a support material. The above points are mainly different from the embodiment shown in FIGS. About another point, it is as substantially the same as embodiment shown in FIGS.

  Next, a specific method for attaching the embedded mold according to this embodiment will be described. FIGS. 13 and 14 are cross-sectional views in the tunnel extension direction showing the attachment method for each procedure. The steps (FIGS. 13A and 13B) of fixing a plurality of base plates 10 having a plurality of nuts 11 in parallel to the repair / reinforcing surface of the lining concrete 1 by the anchor 5 are shown in FIGS. This is the same as the embodiment shown.

  After the base plate 10 is fixed, the first dimension bolts 24 are attached to the nuts 11 as shown in FIG. A cone 26 is attached to the first cutting bolt 6. By adjusting the mounting position of the cone 26, it can be adjusted to the reinforcing thickness t. The cone 26 is a well-known one used as a member constituting a separator in normal formwork.

  Next, as shown in FIG. 13 (d), the fiber mat 2 is installed on the repair / reinforcement surface of the lining concrete 1. As in the above-described embodiment, the fiber mat 2 is used as a first cut bolt 24 with a wire that does not cause rust such as a stainless steel wire in a place where it falls due to gravity, such as the top of the tunnel. Temporarily fixed.

  Next, as shown in FIG. 14 (e), the main formwork board 4 is installed between the adjacent base plates 10 and 10 so that the fiber mat 2 is sandwiched between the repair / reinforcement surfaces. At that time, the tip of the spring member 23 is pierced into the fiber mat 2 and temporarily fixed to the base plate 10 or the like by appropriate means. Further, the second cut bolt 25 is attached to the cone 26.

  Next, as shown in FIG. 14 (f), for each base plate 10, the adjustment formwork board 3 is passed through the second dimensioning bolts 25 attached thereto. And this adjustment formwork board 3 is clamped between the press nut 28 and the cone 26 which were attached to the 2nd cutting bolt 25, and the adjustment formwork board 3 is installed in this way. The width dimension of the adjustment formwork board 3 is larger than the interval between the main formwork boards 4 and 4 adjacent to each other. Therefore, both end edges of the adjustment formwork board 3 are the end edges of the main formwork boards 4 and 4. Overlapping parts. In this state, the main formwork board 4 is brought into close contact with the back surface of the adjustment formwork board 3 by the pressing force of the spring member 23.

  Next, as shown in FIG. 14 (g), a plurality of single pipes 8 are arranged on the surface of the adjustment formwork board 3, and the single pipes 8 are attached to the second cut bolts 25 with the home tie 7. Fix it. With this support material, the adjustment formwork board 3 and the main formwork board 4 are held at predetermined positions. When the support material is attached, a spacer 29 is interposed between the main formwork board 4 and the single pipe 8. After that, cement solidified material is injected into a closed space between the mold board 3, 4 and the repair / reinforcement surface from an injection hole (not shown) provided in the main mold board 4 to impregnate the fiber mat 2. Then, after the cement-based solidifying material is hardened, the support material such as the home tie 7 and the single pipe 8 and the adjustment formwork board 3 are removed, and the second cutting bolt 25 is removed from the cone 26 (see FIG. 12). . In this way, the reinforcing layer 18 without a step on the surface is formed.

It is a top view which shows the state which completed the attachment of the embedded formwork. It is the sectional view on the AA line of FIG. FIG. 3 is an enlarged sectional view taken along line B-B in FIG. 2. It is an expanded sectional view which shows the state which removed the support material after hardening of the cement-type solidification material. It is sectional drawing of the tunnel extension direction which shows the attachment method of a buried form for every procedure. It is sectional drawing which shows the procedure following FIG. It is a top view which shows another embodiment from which a support work differs. It is CC sectional view taken on the line of FIG. It is a top view which shows another embodiment and shows the state which completed the attachment of the embedded formwork. FIG. 10 is a sectional view taken along line D-D in FIG. 9. It is the EE line expanded sectional view of FIG. It is an expanded sectional view which shows the state which removed the support material after hardening of the cement-type solidification material. It is sectional drawing of the tunnel extension direction which shows the attachment method of a buried form for every procedure. It is sectional drawing which shows the procedure following FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Covering concrete 2 Fiber mat 3 Adjustment formwork board 4 Main formwork board 5 Anchor 6 Cutting bolt 7 Home tie 8 Single pipe 10 Base plate 11 Nut 14 Adjustment nut 15 Holding nut 16 Sealing material 17 Embedded bolt 18 Reinforcement layer 20 Pressing channel 21 Stopping channel 22 Step (dent)
23 Spring member 24 Cone 24 1st cutting bolt 25 2nd cutting bolt 26 Cone 27 Rubber packing 28 Holding nut 29 Spacer

Claims (5)

An embedded structure mounting structure in which a fiber mat is disposed on a repair / reinforcement surface of a concrete structure, and the embedded form is attached so that the fiber mat is sandwiched between the repair / reinforcement surface,
The embedded formwork includes a plurality of adjustment formwork boards fixed in parallel to the repair / reinforcement surface at intervals, and a main formwork board installed between the adjustment formwork boards adjacent to each other. Configured,
The main formwork board is installed so that both end edges thereof overlap each end edge part of the adjustment formwork board adjacent to each other. Mounting structure. Fixing a plurality of base plates provided with a plurality of female screw portions spaced in one direction on a repair / reinforcement surface of a concrete structure in parallel with a distance;
A step of attaching a dimensioning bolt having a height adjustment nut matched to the reinforcement thickness to each female thread part;
A process of placing fiber mats on the concrete repair / reinforcement surface;
Passing the adjustment formwork board through the dimensioning bolts of each base plate and sandwiching the adjustment formwork board between the height adjustment nut and the holding nut attached to the dimensioning bolt; and
A step of installing the main formwork board between the adjustment formwork boards adjacent to each other such that both end edges overlap with the respective end edges of the adjustment formwork board;
A method for attaching an embedded formwork in a repair / reinforcement method for a concrete structure comprising a step of installing a support material on the surface of the main formwork board via the dimension bolt. Fixing a plurality of base plates provided with a plurality of female screw portions spaced in one direction on a repair / reinforcement surface of a concrete structure in parallel with a distance;
Attaching a first cut bolt having a cone matched to the reinforcing thickness to each female thread;
A process of placing fiber mats on the concrete repair / reinforcement surface;
Between the base plates adjacent to each other, installing a main formwork board so as to sandwich the fiber matrix between the repair and reinforcement surfaces;
Attaching a second cutting bolt to the cone;
The adjustment formwork board is passed through the second cutting bolt of each base plate, and both end edges thereof are overlapped with each end edge part of the main formwork board adjacent to each other, and the adjustment formwork board is attached to the cone. And a step of sandwiching and installing between the holding nut attached to the second dimensioning bolt,
A method for attaching an embedded formwork in a repair / reinforcement method for a concrete structure, comprising a step of installing a support material on the surface of the adjustment formwork board via the second cut bolt.   4. The method for attaching a buried form in a repair / reinforcement method for a concrete structure according to claim 2, wherein the base plate is fixed to the repair / reinforcement surface by an anchor.   The back surface of the main formwork board is provided with a spring member that receives a reaction force from the repair / reinforcement surface and presses the main formwork board toward the adjustment formwork board. Item 4. A method for attaching a buried form in the repair / reinforcement method for a concrete structure according to item 3.

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