JP3515185B2 - Concrete repair agent injection plug - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete repair agent injection plug used for repairing concrete wall surfaces.

[0002]

2. Description of the Related Art Recently, regarding concrete structures,
The deterioration of the material, concrete, has become a problem. Deterioration of concrete due to various causes causes the base mortar layer to peel off from the concrete skeleton, and the resulting fall of the wall material may cause personal injury. Therefore, establishment of a repair method for such concrete wall surfaces has become an urgent social issue.

As a method for repairing the concrete wall surface, the present inventor has invented a repair method in which an arc-shaped injection groove having a constant width is formed on the wall surface and a concrete repair agent is injected through an injection plug fixed in the groove, We have filed several patent applications for the concrete repair agent injection plugs used for this. Japanese Patent Application No. 3-282263 discloses a concrete repair agent injection plug relating to the latest improvement.

As shown in FIGS. 7 and 8, this improved injection plug has an elastic body having a shape and dimensions such that at least a part thereof can be inserted into an arc-shaped injection groove (D) formed in a concrete wall surface. (23) and a pressing body (2
1,22), the concrete repair agent injection pipe (26) that can be inserted into and removed from the through hole formed by connecting the pressing body and the elastic body, and the pressing body (21,22). As a result, the elastic body (23) sandwiched by these is compressed and laterally expanded to thereby fix the entire plug in the groove, and the pressing mechanism (24, 25) is provided.

[0005]

[Problems to be Solved by the Invention] Prior application (Japanese Patent Application No. 3-2822)
The concrete repair agent injection plug disclosed as an example in the specification of No. 63) assumes an arc-shaped injection groove having a relatively wide width of about 10 mm, and in such a case, it is an optimum form. It is already known. However, along with the progress of the repairing method using such an arc-shaped injection groove, there has recently been a demand for miniaturization of the injection groove. This is because if the injection groove is too large, it takes labor and time to restore the wall surface after the injection work is completed. In addition, an injection groove having a narrow width, for example, a width of about 3 mm, which can be formed without damaging an existing tile, has been required in a narrow width portion such as a tiled joint cut portion. .

The repair agent injection plug of the embodiment shown in FIGS. 7 and 8 has a problem that it cannot cope with an injection groove having a narrow width. This is because the pressing mechanism mainly consists of the bolts (24) that are inserted into the injection groove, so the diameter of the bolts (24) must be reduced as the width of the injection groove decreases, making it difficult to secure strength. Because it will be. That is, if the pressure applied during the injection of the concrete repair agent is set to a constant value, halving the width of the pouring groove will halve the fixing force of the plug in the pouring groove, but also the diameter of the bolt (24) will be halved. There must be. Thus, by halving both the tensile force that a bolt must withstand and the diameter of the bolt, the cross-sectional area of the bolt becomes 1/4.
Therefore, the simple tensile stress will be doubled. If only the pulling force is acting, the breakage is not a problem, but the actual bolt is subjected to the twisting force as well as the pulling force, so that the breakage becomes a problem. Accordingly, one object of the present invention is to provide an injection plug of a concrete repair agent which can be applied to an injection groove having a narrow width.

Further, if the injection plug becomes smaller along with the decrease of the injection groove width, there arises a problem that it becomes difficult to fix the injection plug in the injection groove. Therefore, another object of the present invention is to
An object is to provide a concrete repair agent injection plug having a structure that can be easily fixed.

[0008]

According to the concrete repair agent injection plug of the present invention which solves the above-mentioned problems of the prior art, the pressing mechanism is constructed by rotating the bolt from the first pressing body.
A member that is moved away from the second pressing body by the propulsive force generated , and a screw mechanism that connects the member and the second pressing body to each other.
A connecting member that connects without intervening,
Also has a small outer diameter . A concrete repair agent injection plug according to another aspect of the present invention is
Concrete repair agent detachably attached to the first pressing body
Ru protruded to the outside of the injection groove and a handle.

[0009]

According to the plug of the present invention, the connecting member has a screw mechanism.
Since there is no intervening force, and no torsional force acts on the connecting member, only a simple pulling force acts, so the outer diameter of this connecting member is used for propulsion as the injection groove width decreases . Bol
Threaded like prior art bolts even smaller than
The problem of destruction is unlikely to occur. In addition, the external pressure of the injection groove
By attaching the detachable handle protruding to the outside to the body, even if this plug is downsized, the work of attaching it to the concrete wall surface is secured.

[0010]

1 is a side sectional view of a concrete repair agent injection plug according to an embodiment of the present invention, and FIG. 2 is a cross sectional view of the plug of FIG. . FIG. 3 is a side sectional view showing a state in which the concrete repair agent injection plug shown in FIGS. 1 and 2 is fixed in an arc-shaped injection groove by using the setting handle 10, and FIG. 4 is a connection of FIG. FIG. 5 is a cross-sectional view including the rod 4, and FIG. 5 is a side view when the setting handle 10 is engaged with the concrete repair agent injection plug.

In each of FIGS. 1 to 5, 1 is a first pressing body, 2 is a second pressing body, 3 is an elastic body, 4 is a connecting rod, 5 is a wing bolt, and 6 is a repair agent injection. A pipe, 7 is a horizontal bar, and 8 is a connecting bolt. Further, 9 is a handle engaging pin, 10 is a handle, 11 is a fixed locking arm, 12 is a movable locking arm, 13 is a locking arm regulating eccentric cam, 14 is a regulating eccentric cam rotation lever, and 15 is It is a tension spring. Further, in FIG. 3, A is an outer wall layer of mortar, B is a concrete skeleton layer, C is a separation space layer, and D is an injection groove having an arc shape.

The first and second pressing bodies 1 and 2 and the horizontal bar 7 are made of a material having high strength and rigidity such as metal or plastic. The elastic body 3 is made of a material having an appropriate elasticity such as urethane rubber, and is sandwiched between the first pressing body and the second pressing body. Second pressing body 2
Are connected to the horizontal bar 7 by a connecting rod 4. The connecting rod 4 is made of a material having a high tensile strength (piano wire in this embodiment), and a plurality of connecting rods 4 (one in each of the left and right in this embodiment) are arranged at appropriate intervals from the center of the injection plug. . The connecting rod 4 includes the second pressing body 2, the elastic body 3,
The first pressing body 1 and the horizontal bar 7 are communicated with each other, and both ends of each are formed into a round plate rivet head shape, and are fixed to the second pressing body 2 and the horizontal bar 7. It strongly resists the pulling force generated at the fixing portion of the horizontal bar 7.

Screw holes are formed at both ends of the horizontal bar 7, and butterfly bolts 5 are screwed into the screw holes. The butterfly bolt 5 approaches the fixing portion of the connecting rod 4 of the horizontal rod 7 and is held perpendicularly to the upper surface of the first pressing body 1 (parallel to the axis of the connecting rod 4), and its tip end. The portion fits into a cylindrical pit-shaped recess formed on the upper surface of the pressing body 1 to prevent the tip portion from escaping due to a compressive load generated on the butterfly bolt. The horizontal bar 7 is divided into two equal parts in the vertical cross section, and includes a connecting rod 4, a butterfly bolt 5, an injection pipe 6, and a connecting bolt 8.
After performing the processing required for the attachment, etc., they are integrally connected by connecting bolts 8 appropriately arranged on both sides of the fixing portion of the connecting rod 4.

In the central portion of the concrete repair agent injection plug of this embodiment, the second pressing body 2, the elastic body 3, the first pressing body 1 and the horizontal bar 7 are penetrated to vertically communicate with each other. A hole is formed, and a concrete repairing agent injection pipe 6 is inserted into and removed from the through hole. In this embodiment, a thin metal pipe is used as the injection pipe 6, and the injection pipe 6 is crushed by a crushing tool such as pliers after the injection is completed to prevent the injected repair agent from flowing back.

At one end of the connecting rod 4, a round plate-like head portion is formed by a die forging method or the like to prevent it from coming off. That is, as shown in FIG. 6, first, a material 4a is prepared by cutting a long piano wire into a predetermined length (A). Next, one end of the raw material 4a is heated to such a degree that it becomes red, and a round plate-shaped head 4b is formed using a die (B). Before and after forming the round plate-shaped head 4b, the material 4a
While forming a plurality of parallel grooves 4c on the other end of
A fitting type button hardware 4d having a round plate shape is prepared. The button metal member 4d is made of a malleable metal such as mild steel, aluminum alloy, or brass, and has a hole having the same inner diameter as the outer diameter of the material formed inside the round plate-shaped lump.

While the circular plate-shaped head 4b is positioned on the bottom surface of the pressing body 2, the material 4a is placed on the first and second pressing bodies and the elastic body 3
The through hole formed inside is passed through, and the end portion where the groove 4c is formed is projected to the outside of the first pressing body 1. As shown in FIG. 6 (D), the button hardware 4d prepared in advance is fitted into the end protruding from the pressing body 1, and the button metal 4d is inserted into the protruding end by crushing with a tool. Firmly fix. As another fixing method of the button hardware 4d, a thread groove is formed at one end of the material 4a and the button hardware is screwed in, and then the ends are fused and integrated to prevent coming off, or soldered to the screw portion. It is also possible to adopt a method of pouring an adhesive.

In the assembly of the concrete repair agent injection plug of this embodiment, as described above, the connecting rod 4 whose one end is shaped like a round plate rivet is used as the second pressing body 2 and the elastic body 3.
And the first pressing body 1 are respectively penetrated, and the tip end portion thereof is shaped into a round plate rivet head shape by the above-mentioned method or the like, and then sandwiched from the left and right by the horizontal bar 7 which is divided into two parts. Completed by joining together.

Next, a method of using the concrete repairing agent injection plug of this embodiment will be described, but before that, a concrete mural painting to be repaired will be described. As shown in FIG. 3, the concrete wall surface to be repaired is composed of a concrete skeleton layer B and a mortar outer wall A covering the concrete skeleton layer B, and a peeling space layer C generated between them due to deterioration of concrete.
Are formed. The main purpose of the repair work using the thin concrete repair agent injection plug of the present invention is to utilize the narrow repair site such as the joints of tiles stretched on the outer wall of the mortar to be repaired to make the concrete in the separation space layer C. It is to fill the repair agent.

1) By rotating the butterfly bolt 5 screwed to the horizontal bar 7 in the counterclockwise direction to bring the horizontal bar 7 and the pressing body 1 close to each other, the pressing bodies 1 and 2 are separated from each other and elastically moved. The injection pipe 6 is inserted into the through hole in the central portion in a state where the pressing force on the body 3 is released. 2) As shown in FIG. 3, using a concrete cutter or the like on the concrete wall surface to be repaired, an arc-shaped injection groove D having a substantially constant width (about 3 mm to 4.5 mm in this embodiment).
To form. 3) After the injection plug setting handle 10 and the injection plug of the present embodiment are integrally engaged with each other using the engagement pin 9 and the locking arms 11 and 12, the upper surface of the elastic body 3 is substantially in the outer wall surface in the injection groove D. The elastic body 3 is pushed into the injection groove D until they match.

4) The wing bolt 5 is rotated clockwise while the elastic body 3 is pushed into the injection groove D by using the setting handle 10 and the gap between the horizontal bar 7 and the pressing body 1 is changed. Is enlarged and the interval between the first pressing body 1 and the second pressing body 2 is narrowed via the connecting rod 4. Along with this, the elastic body 3 sandwiched between the pressing bodies 1 and 2 is compressed and laterally expanded, firmly adhering to the inner wall surface of the injection groove D and the outer peripheral surface of the injection pipe 6, respectively. High liquid tightness is secured in the close contact part of. After that eccentric cam 1 for locking arm regulation
3 rotates the lever 14 for rotating the eccentric cam to lock the arm 1
2 is made movable to release the engagement with the main injection plug, and the setting handle 10 is pulled upward to remove from the main injection plug.

5) An injection hose is connected to the root side of the injection pipe 6 via an appropriate connector, and the concrete repair agent is injected under pressure by a pump or the like. The injected concrete repairing agent is injected into the injection pipe 6 protruding into the injection groove D.
Flows into the injection groove D from the tip of the. At this time, the injection groove D
The air inside or in the peeling space C is discharged to the outside through the injection pipe of the other uninjected injection plug. The poured concrete repairing agent fills the filling groove D and the peeling space layer C, and the filling state is the filling pipe 6 of the unfilled filling plug.
Check for overflow from the root end. After confirming the end of the filling by this overflow, the injection of the concrete repair agent is stopped, and the backflow of the repair agent filled by crushing the projecting portion from the horizontal rod 7 on the base side of the injection pipe 6 with a compression tool such as pliers. Prevent.

6) When the butterfly bolt 5 is rotated counterclockwise with the concrete repair agent injected through the steps 1) to 5) being solidified to some extent, the elastic body 3
Is elastically contracted in the lateral direction, and the close contact with the inner wall surface of the injection groove D is released. Then, the injection plug is removed from the injection groove D, and the injection of the concrete repair agent is completed.

As described above, in this embodiment, only the injection pipe is used.
Although the configuration in which the air vent pipe is omitted is illustrated, the configuration may be added.

In addition, the case where the length of the elastic body 3 is made slightly longer than the length of the arc-shaped injection groove D so that both end portions protrude from the injection groove D is illustrated. It may be configured to be insertable.

Further, although the structure for crushing the injection pipe 6 to prevent the backflow of the injection repair agent after the completion of the injection has been exemplified, the crushing operation may be omitted. In this case, a metal or hard plastic pipe is used as the injection pipe, and after the injection of the concrete repair agent is stopped, the root end of the injection pipe from which the injection connector has been removed is closed by, for example, attaching a lid. You can do it like this.

[0026]

As described in detail above, in the concrete repair agent injection plug of the present invention, the connecting member has the screw mechanism.
Since there is no interposition and no torsional force acts on the connecting member, only a simple pulling force acts, so its outer diameter is smaller than that of the propulsion bolt as the injection groove width decreases. Even if it is done, there is an advantage that the problem of breakage of the thread groove unlike the prior art bolt does not easily occur.

Further, since the concrete repair agent injection plug of the present invention has a structure in which the detachable handle is attached to the pressing body outside the injection groove, even if the injection plug is downsized, it can be applied to the concrete wall surface. The ease of installation work is secured,
There is an advantage that work efficiency is significantly improved .

[Brief description of drawings]

FIG. 1 is a side sectional view of a concrete repair agent injection plug according to an embodiment of the present invention.

2 is a cross-sectional view of the concrete repair agent injection plug of FIG. 1 cut in a plane including the injection pipe 6 in an orthogonal direction.

FIG. 3 is a side sectional view showing a state where the concrete repair agent injection plug shown in FIGS. 1 and 2 is fixed in an arc-shaped injection groove by using a setting handle 10.

4 is a cross-sectional view of the concrete repair agent injection plug of FIG. 3 taken along a plane including a connecting rod 4. FIG.

FIG. 5 is a side view for explaining how the setting handle 10 is engaged with the concrete repair agent injection plug of the above embodiment.

FIG. 6 is a process drawing for explaining an example of the method for manufacturing the connecting rod used in the above-described embodiment.

FIG. 7 is a side sectional view of a prior art concrete repair agent injection plug.

8 is a cross-sectional view of the concrete repair agent injection plug of FIG. 7 taken along a plane including a bolt 24 in an orthogonal direction.

[Explanation of symbols]

1 First pressing body 2 Second pressing body 3 elastic body 4 connecting rod 5 butterfly bolt 6 Repair agent injection pipe 7 horizontal bar 10 handle A mortar outer wall layer B Concrete structure layer C peeling space layer D Arc-shaped repair agent injection groove

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) E04G 23/02

Claims (5)

(57) [Claims] 1. An elastic body having a shape and dimensions such that at least a part thereof can be inserted into an injection groove formed in a concrete wall surface, and first and second pressing bodies for sandwiching the elastic body. The pressing body is disposed outside the injection groove, and the second pressing body is inserted inside the injection groove,
The interval between the first and second pressing bodies and the concrete repair agent injection pipe that is removably inserted into a through hole formed by connecting the first and second pressing bodies and the elastic body to each other is shortened. In the concrete repair agent injection plug, comprising: a pressing mechanism for compressing the elastic body sandwiched by each and expanding the elastic body in the lateral direction, wherein the pressing mechanism changes the rotation of the bolt from the first pressing body.
A member that is moved away from the second pressing body by a propulsive force generated by the second pressing body, and a connecting member that connects the member and the second pressing body without a screw mechanism.
A concrete repair agent injection plug comprising : a bolt having an outer diameter smaller than that of the bolt . 2. An elastic body having a shape and dimensions such that at least a part thereof can be inserted into an injection groove formed in a concrete wall surface, and first and second pressing bodies for sandwiching the elastic body. The pressing body is disposed outside the injection groove, and the second pressing body is inserted inside the injection groove,
The interval between the first and second pressing bodies and the concrete repair agent injection pipe that is removably inserted into a through hole formed by connecting the first and second pressing bodies and the elastic body to each other is shortened. In the concrete repair agent injection plug having a pressing mechanism for compressing the elastic body sandwiched by them and expanding the elastic body in the lateral direction, the concrete repair agent injection plug is detachably attached to the first pressing body and is outside the injection groove.
Concrete repairing agent injection plug, characterized in that it comprises a handle is Ru protruded part. 3. The pressing mechanism according to claim 2, wherein the first pressing body rotates the bolt.
Before a coupling member for consolidated without interposing a member which is away on the opposite side, the screw mechanism and the member and the second pressing body of the second pressing member by a propelling force more generated
A concrete repair agent injection plug comprising : a bolt having an outer diameter smaller than that of the bolt . 4. The connecting member according to claim 1 , wherein the connecting member has bulges for preventing the connecting member from coming off.
Concrete repair agent characterized by being composed of striated filaments
Injection plug plug. 5. The concrete structure according to claim 4 , wherein the filament is a piano wire.
Repair agent injection plug .