JP2005139766A - Falling preventive method of existing mortar - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent progress of the deterioration; and to maintain an aesthetic appearance, by strengthening a fixation of existing mortar in the out-of-plane direction more than a conventional technology, for preventing falling of the existing mortar in a reinforced concrete structure. <P>SOLUTION: An abutting T-shaped anchor pin is inserted into an anchor hole for injecting an epoxy resin, and a head part horizontal shape part of the abutting T-shaped anchor pin is allowed to abut on a mortar fresh surface or a fiber net reinforcing layer surface, and is fixed to skeleton concrete, and a new surface layer is arranged on the whole surface. The falling of the existing mortar is physically prevented by the abutting action to the mortar fresh surface or the fiber net reinforcing layer surface by the head part horizontal shape part of the abutting T-shaped anchor pin, to recover the aesthetic appearance by the new surface layer. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for preventing fall of existing mortar in a reinforced concrete structure, and relates to a method for preventing fall of existing mortar in a reinforced concrete structure that can prevent the fall of the existing mortar in an out-of-plane direction as compared with the prior art. It is.

  In many cases, existing mortars are prevented from falling in reinforced concrete structures. 1. Rod-shaped anchor pinning method 2. T-shaped anchor pinning method for burial; Although it is an adhesive injection method or the like, it can be said that it is not always perfect as a technique for preventing the fall in the out-of-plane direction.

  In the rod-shaped anchor pinning method shown in FIG. 10, the anchor hole 7 is drilled from the surface of the mortar 2 toward the concrete frame 1 and the rod-shaped anchor 12 is inserted after the adhesive 8 is injected. Although the mortar is fixed by the adhesive force of the adhesive 8 in the gap with the mortar 12, the bonding area between the bar-shaped anchor 12 and the mortar 2 is very small, and the fixing performance corresponding to the repetitive behavior of the mortar in the out-of-plane direction is achieved. It is difficult to hold for a long period of time, and the existing mortar 2 peels off from the rod-shaped anchor 12 and moves in an out-of-plane direction, causing a drop phenomenon, and in the worst case, has a drawback of dropping.

  In the rod-shaped anchor pinning method shown in FIG. 10, since the adhesion area is small between the existing mortar 2 and the rod-shaped anchor 12 having a small coating thickness, the holding force per rod-shaped anchor is small, so that it can counter external forces such as wind pressure. The number of rod-shaped anchors was increased, and there was a drawback that cracks were induced in the mortar layer by installing a large number of rod-shaped anchors that restrained the mortar layer.

  In the embedding T-shaped anchor pinning method shown in FIG. 11, the embedding of the embedding T-shaped anchor pin embedding groove 14 on the surface of the mortar 2 and the formation of the anchor hole 7 reaching the concrete frame 1 from the surface of the mortar 2 are performed. Then, after the adhesive 8 is injected into the anchor hole 7 and the embedded T-shaped anchor pin embedded groove 14, the embedded T-shaped anchor pin 13 is inserted, and the embedded T-shaped anchor pin head 13 a is inserted into the embedded groove 14. The mortar layer is almost cut by cutting the burying T-shaped anchor pin burying groove 14 at a portion where the mortar coating thickness is thin. The head 13a has a drawback that the effect of directly pressing the mortar cannot be expected.

The adhesive injection method shown in FIG. 12 is a procedure in which the adhesive 8 is injected from the injection hole 11 provided on the surface of the existing mortar 2 peeled from the concrete frame 1 and the peeled gap is filled with the adhesive 8. If efflorescence that inhibits adhesion is generated and adhered to the interface between the concrete at the location and the existing mortar, good adhesion cannot be obtained. It had the disadvantage of falling outward.
JP-A 63-247470

  In order to prevent the fall of the existing mortar in the reinforced concrete structure, the fixing of the existing mortar in the out-of-plane direction is strengthened to prevent the progress of deterioration than the conventional technique.

  In other words, the fixability of the existing mortar in the rod-shaped anchor pinning method is determined by the adhesive force between the rod-shaped anchor and the existing mortar. Since the bonding performance is unstable, the bonding reliability for suppressing the movement of the mortar in the out-of-plane direction is low, and the existing mortar 2 is dropped in the out-of-plane direction due to the phenomenon of the rod-shaped anchor being pulled out.

  In the T-shaped anchor pinning method for embedding, it is necessary to engrave the T-shaped anchor pin embedding groove for embedding in the existing mortar, but since the coating thickness of the mortar in the actual building is not uniform, a thin part occurs, In addition, in a building that employs a method of thinning repair mortar coating on the concrete surface of the skeleton, the mortar layer is almost cut by engraving, so the existing mortar is directly applied by the T-shaped anchor pin for burial. It had the disadvantage that it could not be pressed.

  Fixing existing mortar in the adhesive injection method involves injecting adhesive into the gap between the concrete and mortar from the injection hole on the mortar surface. Since it adhered, good adhesion could not be obtained, so that peeling occurred again after repair, and the existing mortar dropped in the out-of-plane direction as peeling progressed.

  In view of these circumstances, the present invention aims to solve the above-described problems by adopting the following configuration, and by improving the performance of suppressing the movement of the mortar in the out-of-plane direction, It is intended to prevent falling.

  The T-shaped anchor pin for contact according to the method of the present invention is an integral type consisting of a head and a foot, has a horizontal shape portion on the head, and has a shape that prevents the foot from being pulled out. The horizontal shape portion of the head is brought into contact with the surface of the existing mortar or the surface of the newly provided fiber net reinforcing layer to enhance the fall prevention performance of the existing mortar in the out-of-plane direction.

  In other words, the horizontal shape part of the head primarily bears the out-of-plane force generated in the mortar, and this out-of-plane force is finally transmitted to the concrete by the adhesive through the foot part having a shape to prevent it from coming out, so it can be seen in the rod-shaped anchor pinning method Such anchor pin pull-out phenomenon does not occur at all, and even in the case of a mortar with a thin coating thickness, the performance can be exhibited without causing a cross-sectional defect, so that the construction method of the present invention can ensure a mortar fall prevention function. Is.

  Since the construction method of the present invention is a method of construction from the surface of the existing mortar surface, it is a construction method that can also be constructed in a place where the existing mortar is not floating for the purpose of preventing the fall of the existing mortar.

  Existing mortar expands and contracts due to changes in daily temperature and humidity. This expansion and contraction generates stress inside the mortar. By repeating the expansion and contraction, the mortar is gradually pushed out of the plane and a stagnation phenomenon occurs. Although it will cause a fall, the method of the present invention functions so that the horizontal shape part of the T-shaped anchor pin head for contact is pressed from the surface of the existing mortar, and this stagnation phenomenon can be prevented. It is a simple construction method.

  The purpose of constructing a new surface layer over the entire surface by the present invention method is to restore the aesthetics by eliminating the presence of the horizontal shape part of the anchor pin head to be applied to the existing mortar surface or the surface of the fiber net reinforcing layer. It is to obtain the protective effect of the concrete frame.

  When the existing mortar is divided by cracks or when the coating thickness of the existing mortar is thin, a net reinforcement layer made of fiber is applied to the existing mortar surface to integrate them and improve rigidity. By installing a T-shaped anchor pin for contact inside the housing from the surface of the fiber net reinforcement layer, it is possible to ensure the function of preventing the existing mortar from falling.

  In the cracked part of the existing mortar, the horizontal shape part of the T-shaped anchor pin head for contact is installed so as to cross the crack, thereby suppressing the behavior of the cracked part in the out-of-plane direction at the end of the mortar. Therefore, it is possible to secure the fall prevention function of the existing mortar with excellent durability.

  The standard number of T-shaped anchor pins for abutment is about 4 per square meter. However, wind force, seismic force, weight (thickness), cracking of existing mortar, and peeling of existing mortar. And it can determine in consideration of the shape of a wall surface.

In order to solve the above-mentioned problems, the present invention has an object to obtain an existing mortar fall prevention method characterized by having the following configuration as a method for preventing fall of an existing mortar in a reinforced concrete structure. In the invention according to claim 1,
1. Mark the anchor installation point.
2. Sand the existing paint film surface at the anchor installation point to expose the mortar fresh surface.
3. An anchor hole that penetrates the mortar layer and reaches the inside of the concrete frame is drilled at the anchor installation point.
4). After injecting the adhesive into the anchor hole, the abutting T-shaped anchor pin is inserted into the anchor hole, and the abutting T-shaped anchor pin head horizontal portion is fixed so as to abut on the mortar fresh surface. .
5). The technical means of preventing the fall of the existing mortar layer by adopting a new surface layer on the entire surface was adopted.

In the invention according to claim 2,
An existing mortar fall prevention method comprising the following steps as a method for reinforcing and repairing an existing mortar in a reinforced concrete structure.
1. Mark the anchor installation point.
2. Band-shaped sanding is performed at the anchor installation point to expose the mortar fresh surface.
3. 3. A fiber net reinforcing layer obtained by sticking a fiber net while applying polymer mortar on a belt-like mortar fresh surface is provided. Anchor holes that penetrate the mortar layer from the surface of the fiber net reinforcement layer and reach the inside of the concrete frame are drilled.
5). After injecting the adhesive into the anchor hole, the abutting T-shaped anchor pin is inserted into the anchor hole so that the abutting T-shaped anchor pin head horizontal shape portion abuts the fiber net reinforcing layer surface. Let it settle.
6). Adopted a technical means to prevent the fall of the existing mortar layer by constructing a new surface layer over the entire surface.

  In the invention according to claim 3, the T-shaped anchor pin for contact is an integral type comprising a head and a foot, the head has a horizontal surface shape portion, and the foot portion has a slip-off preventing shape portion. The technical means called fall prevention method of the existing mortar according to claim 1 or 2 characterized by having the above.

  The invention according to claim 4 is characterized in that the polymer mortar is a mortar mixed with an organic synthetic polymer resin emulsion such as an SBR latex, an acrylic resin emulsion, an ethylene vinyl acetate resin emulsion, or an epoxy resin emulsion. The technical means called the fall prevention method of the existing mortar according to claim 1 or 2 is adopted.

  In the invention described in claim 5, as the fiber net, an inorganic fiber net such as glass fiber, a synthetic polymer resin fiber net such as nylon, an organic fiber net such as bamboo fiber, or a steel fiber The technical means called the fall prevention method of the existing mortar of Claim 1 thru | or 2 characterized by using the nets, such as metal type fiber, etc. characterized by the above-mentioned.

  In the invention of claim 6, as a new surface layer, on-site construction-type finishing materials such as long fiber net combined polymer mortar coating, short fiber mixed polymer mortar coating or fiber net combined molding material factory production product site The technical means called the fall prevention method of the existing mortar of Claim 1 thru | or 2 using the sticking type | mold finishing material etc. was employ | adopted.

As a method for reinforcing and repairing an existing mortar in a reinforced concrete structure, it is a method for preventing the fall of an existing mortar characterized by the following performance.
1. Since the abutting T-shaped anchor pin is excellent in the action of pressing the existing mortar from the surface, an effect of reliably exhibiting the fall prevention performance of the existing mortar can be obtained.
2. Sanding to install the T-shaped anchor pin for contact hardly causes cross-sectional defects in the thickness direction of the existing mortar, so repair and reinforcement utilizing the cross-section of the mortar are possible. When the coating thickness of the mortar is thin, it is excellent in the effect of ensuring the fall prevention performance of the existing mortar.
3. If the existing mortar is cracked or the coating thickness of the existing mortar is thin, a fiber net reinforcement layer is provided on the surface of the existing mortar, and the existing mortar and the fiber net reinforcement layer are integrated. It is possible to ensure the fall prevention performance of the existing mortar by fixing the T-shaped anchor pin for contact from the surface of the fiber net reinforcing layer toward the inside of the frame concrete.
4. The abutment T-shaped anchor pin placed on the surface of the fiber net reinforcement layer has the effect of pressing many meshes of the fiber net used in the fiber net reinforcement layer, so it is excellent in the fall prevention performance of existing mortar. Effect.
5. Sanding for placing the abutment T-shaped anchor pin is so slight that almost no cross-sectional defect in the mortar thickness direction is generated, and there is no induction of cracking by sanding, so durability is good. It is possible to ensure the fall prevention performance of existing mortar.
6. Since the work can be done from the surface of the existing mortar, it is a method that saves labor and generates less industrial waste.
7. Since the existing coating film is partially processed, the removal work is reduced and labor saving is ensured.
8. Since pinning can be systematically performed regardless of whether or not the existing mortar layer is floating, it is possible to omit the floating investigation of the existing mortar layer, and it is easy to make a construction plan and a budget plan.
9. Existing mortar with excellent durability performance due to the synergistic effect of the fall prevention performance of existing mortar with a T-shaped anchor pin for contact, the restoration of aesthetics to the existing mortar with the new surface layer applied over the entire surface, and the protection performance The fall prevention performance is obtained.

  T-shaped anchor pin for contact that has excellent performance of pressing the existing mortar from the surface without causing the cross-sectional defect of the mortar for the purpose of reliably preventing the fall of the existing mortar in the out-of-plane direction. Realized using.

  Hereinafter, the embodiment of the present invention shown in claim 1 will be described in detail in the order of construction based on the drawings. As shown in FIG. 1, marking 4 is performed at an anchor installation location, and then sanding is performed at a depth of about 2 mm from the top of the existing coating film 3 to expose the mortar fresh surface 5.

  Next, as shown in FIG. 2, an anchor hole 7 having a diameter of 6 mm that reaches 25 mm or more from the mortar fresh surface 5 to the concrete frame 1 is drilled. Subsequently, the mortar fresh surface 5 and the inside of the anchor hole 7 are air blown. Clean with brushing.

  Next, an adhesive 8 is injected into the anchor hole 7, and subsequently, the lower surface of the abutting T-shaped anchor pin head horizontal shape portion (outer dimension 3 cm × 1 cm) 9 a is brought into contact with the mortar fresh surface 5. The abutting T-shaped anchor pin foot drop prevention shape portion (height 7 cm) 9 b is inserted into the anchor hole 7 and fixed to the concrete frame 1.

  Next, as shown in FIG. 3, a net made of polypropylene resin fiber is applied to the entire surface while applying polymer resin mortar mixed with acrylic resin emulsion, and the construction trace of the T-shaped anchor pin 9 for contact disappears. And the new surface layer 10 used as a flat layer is constructed.

  FIG. 4 shows a T-shaped anchor pin for contact used in the present embodiment. FIG. 4- (a) is a front view, and shows from the head horizontal shape portion 9a and the foot drop prevention shape portion 9b. A T-shape is shown. FIG. 4- (b) is a side view showing a shape in which the head horizontal shape portion 9a and the foot drop prevention shape portion 9b are continuous at a right angle. FIG. 4- (c) is a plan view showing the planar shape of the head horizontal shape portion 9a. FIG. 4- (d) is a perspective view.

  The embodiment of the present invention shown in claim 2 will be described specifically. As shown in FIG. 5, marking 4 is performed at the anchor installation location, sanding is performed in a strip shape having a width of about 12 cm so that the four marking locations are continuous, and the existing coating film 3 is removed to expose the mortar fresh surface 5.

  Next, as shown in FIG. 6, a glass fiber net reinforcing layer 6 is formed by applying a glass fiber net 6 b having a width of about 10 cm while applying an SBR polymer mortar 6 a to the mortar fresh surface 5.

  Next, as shown in FIG. 7, an anchor hole 7 having a diameter of 6 mm that reaches 25 mm or more from the surface of the glass fiber net reinforcing layer 6 to reach the concrete frame 1 is formed, and the surface of the glass fiber net reinforcing layer 6 and The inside of the anchor hole 7 is cleaned by air blow and brushing.

  Next, an adhesive 8 is injected into the anchor hole 7, and then the lower surface of the abutting T-shaped anchor pin head horizontal shape portion (outside dimension 3 cm × 2 cm) 9 a contacts the glass fiber net reinforcing layer 6. An abutting T-shaped anchor pin foot part prevention shape part (height 7 cm) 9b is inserted into the anchor hole 7 so as to be in contact with the anchor concrete 1 and fixed.

  Next, as shown in FIG. 8, an acrylic resin-based short fiber mixed polymer mortar is sprayed on the entire surface to a thickness of about 2 mm, and the construction trace of the abutting T-shaped anchor pin 9 disappears, and the flat layer and A new surface layer 10 is applied.

  FIG. 9 shows a T-shaped anchor pin for contact used in the present embodiment. FIG. 9- (a) is a front view, and shows the head horizontal shape portion 9a and the foot drop prevention shape portion 9b. A T-shape is shown. FIG. 9- (b) is a side view showing a shape in which the head horizontal shape portion 9a and the foot drop prevention shape portion 9b are continuous at a right angle. FIG. 9C is a plan view showing a planar shape of the head horizontal shape portion 9a. FIG. 9- (d) is a perspective view.

  The present invention is a technique for preventing the fall of existing mortar in a reinforced concrete structure. There is a possibility that it can be used.

Fig. 1- (a) shows a method of installing a mortar fresh surface by marking an anchor installation location and sanding an anchor installation location among existing mortar fall prevention methods according to an embodiment based on claim 1 of the present invention. Is a sectional view taken along line AA, and FIG. 1- (b) is a front view. Of the existing mortar fall prevention methods according to the first embodiment of the present invention, the anchor hole drilling method and the abutment T-shaped anchor pin installation method are shown. FIG. A cross-sectional view taken along line BB and FIG. 2- (b) are front views. Of the existing mortar fall prevention methods according to the first embodiment of the present invention, a method of providing a new surface layer on the entire surface after anchor installation is shown. FIG. FIG. 3B is a front view. FIG. 4 (a) is a front view, FIG. 4- (b) is a side view, and FIG. 4 shows a contact T-shaped anchor pin used in an embodiment based on claim 1 of the present invention. -(C) is a plan view and FIG. 4- (d) is a perspective view. Of the existing mortar fall prevention methods according to the second aspect of the present invention, the marking of the anchor installation location and the method of exposing the mortar fresh surface are shown. FIG. FIG. 5B is a front view. FIG. 6 (a) shows a method of providing a net reinforcing layer of polymer mortar and a fiber net on a mortar fresh surface, among the existing mortar fall prevention methods according to the second embodiment of the present invention. FIG. 6E is a sectional view taken along line E, and FIG. 6B is a front view. FIG. 7- (a) shows a method of installing an abutting T-shaped anchor pin from the surface of the net reinforcing layer among the existing mortar fall prevention methods according to the second embodiment of the present invention. FIG. 7B is a cross-sectional view taken along line FF, and FIG. 7B is a front view. FIG. 8- (a) is a cross-sectional view taken along the line GG of FIG. 8- (a), showing a method of providing a new surface layer on the entire surface of the existing mortar fall prevention method according to the embodiment of the present invention. (b) is a front view. FIG. 9 (a) is a front view, FIG. 9 (b) is a side view, and FIG. 9 (b) shows a contact T-shaped anchor pin 9 used in an embodiment based on claim 2 of the present invention. 9- (c) is a plan view and FIG. 9- (d) is a perspective view. FIG. 10- (a) is a cross-sectional view taken along the line HH, and FIG. 10- (b) is a front view, illustrating a rod-shaped anchor pinning method. FIG. 11- (a) is a sectional view taken along line II and FIG. 11- (b) is a horizontal sectional view showing a T-shaped anchor pinning method for embedding. FIG. 12- (a) is a sectional view taken along the line JJ, and FIG. 12- (b) is a front view showing an adhesive injection method.

Explanation of symbols

1: Frame concrete 2: Mortar (existing mortar)
3: Coating film (existing coating film)
4: Anchor installation location 5: Fresh mortar surface 6: Fiber net reinforcing layer 6a: Polymer mortar 6b: Fiber net 7: Anchor hole 8: Adhesive 9: T-shaped anchor pin 9a for contact: T for contact Shaped anchor pin head horizontal shape part 9b: T-shaped anchor pin for contact prevention shape part 10: New surface layer 11: Injection hole 12: Rod-shaped anchor 13: T-shaped anchor pin 13a for embedding T-shaped anchor pin head 14 for embedding: T-shaped anchor pin embedding groove for embedding

Claims (6)

An existing mortar fall prevention method comprising the following steps as a method for reinforcing and repairing an existing mortar in a reinforced concrete structure.
1. Mark the anchor installation point.
2. Sand the existing paint film surface at the anchor installation point to expose the mortar fresh surface.
3. An anchor hole that penetrates the mortar layer and reaches the inside of the concrete frame is drilled at the anchor installation point.
4). After injecting the adhesive into the anchor hole, the abutting T-shaped anchor pin is inserted into the anchor hole, and the abutting T-shaped anchor pin head horizontal portion is fixed so as to abut on the mortar fresh surface. .
5). A new surface layer is constructed on the entire surface. An existing mortar fall prevention method comprising the following steps as a method for reinforcing and repairing an existing mortar in a reinforced concrete structure.
1. Mark the anchor installation point.
2. Band-shaped sanding is performed at the anchor installation point to expose the mortar fresh surface.
3. 3. A fiber net reinforcing layer obtained by sticking a fiber net while applying polymer mortar on a belt-like mortar fresh surface is provided. Anchor holes that penetrate the mortar layer from the surface of the fiber net reinforcement layer and reach the inside of the concrete frame are drilled.
5). Adhesive is injected into the anchor hole, the abutting T-shaped anchor pin is inserted into the anchor hole, and the abutting T-shaped anchor pin head horizontal shape portion is brought into contact with the fiber net reinforcing layer surface. Let it settle.
6). A new surface layer is constructed on the entire surface.   The abutment T-shaped anchor pin is an integral type composed of a head and a foot, the head has a horizontal shape portion, and the foot has a slip-off preventing shape portion. A method for preventing the existing mortar from falling according to 1 or 2.   The polymer mortar is a mortar mixed with an organic synthetic polymer resin emulsion such as an SBR latex, an acrylic resin emulsion, an ethylene vinyl acetate resin emulsion, or an epoxy resin emulsion. To prevent falling of existing mortar.   Nets made of inorganic fibers such as glass fibers, nets made of synthetic polymer resin fibers such as nylon, nets made of organic fibers such as bamboo fibers, or nets made of metal fibers such as steel fibers The method for preventing falling of an existing mortar according to claim 1, wherein the mortar is used. As the new surface layer, it must be a field-installed finishing material such as polymer mortar coating with fiber net and polymer mortar coating mixed with short fibers, or a factory-finished product-based finishing material such as sheet molding material combined with fiber net. The method for preventing falling of an existing mortar according to claim 1 or 2.