Injector and method for reinforcing concrete structure using the same

Abstract

To provide an injector that improves usage efficiency of injecting materials by reducing the amount of injecting materials remaining in used injectors as much as possible, and that does not need to take excessive environmental measures.SOLUTION: In an injector with a container body internally installed for injecting an injection material stored inside into a void created in a concrete structure by being pressed and deformed by energizing force of an elastic material 5, the container body 3 is composed of a regular polygonal top wall 32, a bottom wall 33 of the same shape as the top wall 32 with an opening 31 in the center, and a cylindrical wall 34 with both end openings closed by the top wall 32 and the bottom wall 33. In the cylindrical wall 34, a plurality of mountain-shaped main convex strips 341 extending from each corner of the regular polygon of the top wall 32 to each corner of the regular polygon of the bottom wall 33 at a twisted position in a circumferential direction, substantially parallel to each other, and inclined in the same direction, a plurality of mountain-shaped sub-convex strips 342 crossing a space extending between adjacent main convex strips 341 to divide the space into a plurality of quadrilateral regions R, and a mountain-shaped concave strip 343 extending diagonally in the same direction as the main convex strip 341 from one vertex of the quadrilateral to the other vertex of the quadrilateral respectively within each region R of the quadrilateral.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an injector for injecting a grouting material and a method for reinforcing a concrete structure using the injector. [Background technology]

[0002] There is a method for reinforcing a concrete structure by injecting an injection material into voids in the structure caused by cracks or the like, and Patent Document 1 shows an injection device that is connected to a surface opening (injection hole) of a concrete structure that communicates with the voids and fills the voids with an injection material. The injection device has a bellows-type cylindrical container body 3' in its casing, as shown in Fig. 22, in which peaks 35 and valleys 36 formed in a direction perpendicular to the cylindrical axis are alternately provided in the cylindrical axis direction. The injection material is contained in the container body 3', and the rear end face (the lower end face in Fig. 22) is pressed by a spring force to contract the container body 3' in the cylindrical axis direction as shown in Fig. 23, whereby the injection material inside is injected into the voids in the concrete structure through a cylindrical opening 31 in the center of the front end face. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Utility model registration No. 3185526 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, in the container body 3' used in the above-mentioned conventional injector, even when the container body 3' is shrunk, a relatively large amount of the injection material contained therein remains within the ridges 35 of the bellows, resulting in a problem of poor efficiency in the use of the injection material and the need for sufficient measures to prevent the injection material remaining in the used injector 3' from polluting the environment.

[0005] Therefore, the present invention is intended to solve such problems, and has an object to provide an injector which reduces the amount of injection material remaining in a used injector as much as possible, thereby improving the efficiency of use of the injection material, and which does not require excessive environmental measures, and a method of reinforcing a concrete structure using the same. [Means for solving the problem]

[0006] In order to achieve the above object, the first invention provides an injector having a container body therein, which is pressed by the urging force of an elastic material (5) to contract and deform, and which injects the injection material stored therein into voids formed in a concrete structure, the container body (3) being composed of a regular polygonal top wall (32), a bottom wall (33) having the same shape as the top wall (32) and having an opening (31) at its center, and a cylindrical wall (34) whose openings at both ends are closed by the top wall (32) and the bottom wall (33), and the cylindrical wall (34) has approximately flat ends extending from each corner of the regular polygon of the top wall (32) to each corner of the regular polygon of the bottom wall (33) which is located at a position twisted in the circumferential direction from the respective corners. The container body (3) is provided with a plurality of mountain-shaped main convex ribs (341) extending in a row at an incline in the same direction, mountain-shaped secondary convex ribs (342) crossing the space extending between adjacent main convex ribs (341) and dividing the space into a plurality of quadrilateral regions (R), and mountain-shaped concave ribs (343) extending obliquely in the same direction as the main convex ribs (341) from one vertex to the other vertex within each quadrilateral region (R). When the top wall (32) is pressed, the peripheral wall (32) is twisted and deformed, and the injection material contained in the container body (3) swirls and flows while receiving an extrusion pressure, and is discharged from the opening (31) in the bottom wall (33).

[0007] In the first invention, the container body is pressed by the urging force of the elastic material and contracts, but the peripheral wall of the container body having the above configuration is twisted and deformed as it contracts, so that the injection material contained in the container body swirls and flows under the extrusion pressure and is quickly discharged without remaining in the container body. Therefore, the efficiency of use of the injection material is improved and excessive measures to avoid environmental pollution when the container body is disposed of are not necessary.

[0008] The method for reinforcing a concrete structure according to the second invention includes a step of applying a sealant to shallow cracks on the surface of a concrete structure by puttying.

[0009] According to the second invention, the final plastering work can be carried out directly without the need for the conventional work of removing excess sealing material.

[0010] The method for reinforcing a concrete structure according to the third invention includes the steps of removing the injector (1) and the injection base (7) after injection has been completed, and performing countersinking to excavate the injection material in the injection hole after removal to a predetermined depth from the surface.

[0011] In the third aspect of the present invention, the countersinking can prevent deterioration of the grouting material caused by ultraviolet rays.

[0012] The reference characters in parentheses indicate, for reference, the correspondence with specific means described in the embodiments described later. Effect of the Invention

[0013] As described above, according to the injector of the present invention and the method of reinforcing a concrete structure using the injector, it is possible to reduce the amount of injection material remaining in a used injector as much as possible, thereby improving the efficiency of use of the injection material, and there is no need to take excessive environmental measures. [Brief description of the drawings]

[0014] [Figure 1] FIG. [Diagram 2] 1A and 1B are plan and cross-sectional views of an injection pedestal. [Diagram 3] FIG. 2 is a side view of a container body for use with the injector of the present invention. [Figure 4] FIG. 2 is an end view of a container body used in the injector of the present invention, as viewed from above. [Diagram 5] FIG. 2 is an end view of a container body used in the injector of the present invention, as viewed from below. [Figure 6]10A to 10C are side views showing the contraction process of a container body used in the injector of the present invention [Figure 7] 10A to 10C are side views showing the contraction process of a container body used in the injector of the present invention [Figure 8] 10A to 10C are side views showing the contraction process of a container body used in the injector of the present invention. [Figure 9] 10A to 10C are side views showing the contraction process of a container body used in the injector of the present invention [Figure 10] 10A to 10C are side views showing the contraction process of a container body used in the injector of the present invention [Figure 11] 10A to 10C are side views showing the contraction process of a container body used in the injector of the present invention [Figure 12] 10A to 10C are side views showing the contraction process of a container body used in the injector of the present invention [Figure 13] 10A to 10C are side views showing the contraction process of a container body used in the injector of the present invention [Figure 14] 1 is a flowchart showing a process for reinforcing a concrete structure. [Figure 15] FIG. 13 is a perspective view of a wall on which an injection pedestal is installed. [Figure 16] FIG. 2 is a perspective view of a wall surface with imprinted sealant. [Figure 17] FIG. 2 is a perspective view of a wall on which the injector is mounted. [Figure 18] FIG. 13 is a perspective view of the wall from which the injector and injection base have been removed. [Figure 19] FIG. 13 is a perspective view of a wall surface where an injection hole has been countersunk. [Figure 20] This is an oblique view of a plastered wall surface. [Figure 21] FIG. 2 is a perspective view of a painted wall surface. [Figure 22] FIG. 1 is a perspective view of a container body used in a conventional syringe. [Diagram 23] FIG. 1 is a perspective view of a container body used in a conventional syringe when contracted. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] It should be noted that the embodiment described below is merely an example, and various design improvements made by those skilled in the art without departing from the gist of the present invention are also included in the scope of the present invention.

[0016] (syringe) The basic structure of the injector of the present invention is similar to that described in the cited document 1, except for the container body. The structure of the injector will be described below with reference to the exploded perspective view of FIG.

[0017] The injector 1 has a cylindrical casing 2, the front half of which (the right half in FIG. 1) contains an expandable and contractible bellows-shaped cylindrical container body 3'. This container body 3' is a conventional one, and the details of the container body according to the present invention will be described later.

[0018] The injection material is contained within the container body 3'. The container body 3' is an integrally molded resin product with a closed rear end (lower end), and a small-diameter cylindrical opening 31 is formed at the front end. A cap 41 is screwed and fixed to the front end opening 21 of the casing 2, and the male threaded portion on the outer periphery of the opening 31 of the container body 3' is screwed and fixed to the female threaded portion of the rear half 411 of the cylindrical opening formed in the center of the cap 41.

[0019] A coil-shaped spring member 5 is inserted as an elastic member into the rear half of the casing 2, and the rear end of the spring member 5 abuts against a cap 42 which is screwed and fixed into the rear end opening 22 of the casing 2, while the front end of the spring member 5 abuts against an end plate 51 disposed inside the casing 2. The end plate 51 is fixed to the tip of an operating rod 6 which penetrates the cap 42 and extends through the center of the spring member 5 into the casing 2.

[0020] A triangular ring-shaped operating piece 61 is attached to the base end of the operating rod 6 that extends out of the casing 2 after penetrating the cap 42, and a pair of locking projections 62 (only one is shown) are formed at appropriate positions in the longitudinal direction of the operating rod 6 at radially symmetric positions on the outer periphery. A notch 421 is formed in the cap 42 to allow the locking projection 62 to pass through, and when the operating rod 6 is pulled outward by the operating piece 61, the spring member 5 deforms into a contracted state and generates a predetermined extension spring force. When the operating rod 6 that has been pulled out a predetermined amount is rotated 90 degrees to engage the locking projection 62 with the outer periphery of the cap 42, the spring member 5 is held between the cap 42 and the end plate 51 in a contracted state.

[0021] The container body 3' containing the injection material is fixed to a cap 41, and the cap 41 is fixed to the front end opening 21 of the casing 2, thereby containing the container body 3' within the front half of the casing 2, and the cap 42 is fixed to the rear end opening 22 of the casing 2 with the spring member 5 contracted.

[0022] Fig. 2(1) shows a plan view of the injection base 7, and Fig. 2(2) shows its cross section. The injection base 7 is composed of a disk-shaped base 71 and a cylindrical connecting part 72 erected at the center of the base 71, and a female thread is formed on the inner circumference of the connecting part 72. The plate surface of the base 21 of the injection base 7 is fixed to the surface of the concrete structure to be repaired by adhesive or the like, as described below. The injector 1 is attached and fixed by screwing the male thread on the outer circumference of the front half 412 of the cylindrical opening protruding from the cap 41 into the female thread of the connecting part 72 of the injection base 7.

[0023] With the injector 1 fixed to the injection base 7, the container body 3' communicates with an injection hole opened at a required position on the surface of the concrete structure. When the operating rod 7 is rotated back 90 degrees to release the engagement between the locking protrusion 62 and the cap 42, the expanding spring force of the spring member 5 acts on the container body 3', causing the container body 3' to contract, and the injection material is injected at a specified pressure through the injection hole into the voids generated in the concrete structure.

[0024] (Container body used in injector) An overall side view of the new container body 3 according to the present invention, which is used in place of the conventional container body 3', is shown in Fig. 3. An end view of the container body 3 as viewed from above is shown in Fig. 4, and an end view of the container body 3 as viewed from below is shown in Fig. 5.

[0025] In this embodiment, the container body 3 is, for example, a blow-molded product made of polyethylene resin, and has a cylindrical shape with a closed upper end. That is, the top wall 32 and bottom wall 33 of the container body 3 are both regular hexagons (see Figs. 4 and 5), and the upper end opening of the cylindrical wall 34 is closed by the top wall 32, and the lower end opening is closed by the bottom wall 33 having a small-diameter cylindrical opening 31 formed in the center. Note that the top wall 32 and bottom wall 33 do not necessarily have to be regular hexagons, and may be regular polygons.

[0026] Here, the cylindrical wall 34 has a folded shape as described below. That is, a plurality of mountain-shaped main convex ribs 341 are formed, which extend from each corner of the regular hexagon of the top wall 32 to each corner of the regular hexagon of the bottom wall 33 at a position twisted in the circumferential direction, approximately parallel to each other and inclined in the same direction (clockwise in FIG. 4 as viewed from above in this embodiment). Furthermore, mountain-shaped secondary convex ribs 342 (the secondary convex ribs 342 at the upper and lower ends are the peripheries of the top wall 32 and the bottom wall) are formed across each space extending between adjacent main convex ribs 341, dividing these spaces into a plurality of quadrilateral regions R, and further, mountain-shaped recessed ribs 343 are formed in each quadrilateral region R, which extend obliquely from one vertex of the quadrilateral to the other vertex of the quadrilateral in the same direction as the main convex ribs 341.

[0027] An injection material is contained inside the container body 3, and the male thread on the outer periphery of the opening 31 of the container body 3 is screwed and fixed into the female thread on the rear half 411 of the opening formed in the center of the cap 41 (see FIG. 1). Then, while the container body 3 is housed in the front half of the casing 2, the cap 41 is screwed and fixed into the front end opening 21 of the casing 2. Thereafter, as described above, while the contracted spring member 5 is housed in the rear half of the casing, the cap 42 is screwed and fixed into the rear end opening 222 of the casing 2. In this embodiment, the injection material is, for example, epoxy resin.

[0028] When using the injector 1, the male threaded portion on the outer periphery of the front half 412 of the cylindrical opening protruding from the cap 41 is screwed and fixed into the female threaded portion of the cylindrical connecting portion 72 of the injection base 7 (see Figure 2) which is installed and fixed at the required position on the surface of the concrete structure.

[0029] With the injector 1 fixed, the container body 4 communicates with an injection hole opened at a required position on the surface of the concrete structure. In this state, when the operating rod 6 is operated as described above to apply the expanding spring force of the spring member 5, the container body 3 is contracted, and the injection material contained therein is injected at a predetermined pressure through the injection hole of the concrete structure into voids occurring inside.

[0030] The change in shape of the container body 3 during this injection is shown in Figures 6 to 13. The container body 3 contracts as a whole due to the expanding spring force of the spring member 5, and if we focus on, for example, regions R1 to R3 of the quadrilateral region R surrounded by the ridges 3341, 342 of the peripheral wall 34 of the container body 3 and track their displacement during this contraction process, as shown in Figures 6 to 12, each of the regions R1 to R3 is displaced in the same circumferential direction (counterclockwise in Figure 4 viewed from above in this embodiment) as the container body 3 contracts, and the peripheral wall 34 is twisted as a whole. In this embodiment, the upper half of the container body 3 is twisted by about 180 degrees as it contracts.

[0031] In this way, when the folded peripheral wall 34 of the container body 3 is twisted as it shrinks, the grout material contained in the container body 3 swirls and flows while being subjected to extrusion pressure. This swirl flow causes the grout material to be quickly fed from the opening 31 of the container body 3, through the cylindrical opening front half 412 of the cap 41 and the cylindrical connecting part 72 of the injection base 7, without remaining in the container body 3, into the injection hole on the surface of the concrete structure. In this way, the grout material is quickly discharged without remaining in the container body 3, improving the efficiency of use of the grout material and eliminating the need for excessive measures to prevent environmental pollution caused by remaining grout material when the container body 3 is disposed of.

[0032] (Reinforcement process for concrete structures) The process of reinforcing a concrete structure using the injector 1 equipped with the container body 3 described above will be described below with reference to FIG.

[0033] First, scaffolding is set up on the wall of a concrete structure to be repaired, for example, a water tank (step 101), and temporary curing is performed. Next, the wall is scraped (step 102), and any water leakage from deep cracks is checked. After the width and depth of the crack are confirmed, the injection position of the injection material is confirmed and an injection hole is drilled (step 103). Then, a modifier is applied to improve the performance of the wall (step 104), and after that, an injection base 7 is installed and fixed in the drilled injection hole by adhesive (step 105, Figure 15).

[0034] Next, the sealant is applied by puttying into shallow cracks on the wall surface other than the injection points (step 106, FIG. 16). In this embodiment, the sealant is, for example, a mixture of ultrafine cement and water. Since the sealant has been applied to the cracks on the wall surface in this way, plastering work can be carried out directly. Unlike the conventional method of filling shallow cracks with organic material to seal them, there is no problem of the filled organic material being peeled off when removing the excess organic material before plastering.

[0035] After that, as described above, the injectors 1 are attached and fixed to each injection base 7 fixed to the wall surface (step 107, Figure 17), and the operating rod 6 (see Figure 1) is operated to apply the expanding spring force of the spring member 5 to contract the container body 3, and the injection material is injected at a predetermined pressure (e.g., 0.11 N / mm2) through the injection hole into the void generated in the concrete structure.

[0036] After the injection is completed, the injector 1 and injection base 7 are removed (step 108, Fig. 18), and the injection material in the injection hole after removal is excavated with a drill, for example, about 10 mm from the surface (step 109, Fig. 19), thereby preventing deterioration of the injection material due to ultraviolet rays. After this, the injection material is putty-filled, the wall surface is plastered (step 110, Fig. 20), and then painting or corrosion protection is performed (step 111, Fig. 21), completing the reinforcement process of the concrete structure.

[0037] Although the above embodiment has been described as a method for reinforcing a concrete structure using the injector of the present invention, a conventional injector may also be used. [Explanation of symbols]

[0038] 1...injector, 3...container body, 31...cylindrical opening (opening), 32...top wall, 33...bottom wall, 34...cylindrical wall, 341...main convex rib, 342...secondary convex rib, 343...concave rib, 5...spring member (elastic material), 7...injection base, R, R1, R2, R3...areas.

Claims

1. In an injector having a container body installed therein, the container body is pressed by the biasing force of an elastic material, contracts and deforms, and injects the injection material stored inside into a gap formed in a concrete structure. The container body is composed of a regular polygonal top wall, a bottom wall having the same shape as the top wall and an opening formed in the center, and a cylindrical wall whose both end openings are closed by the top wall and the bottom wall. The cylindrical wall has a regular polygonal corner of the top wall and a regular polygonal corner of the bottom wall that is located at a position twisted from the regular polygonal corner of the top wall in the circumferential direction and extends in the same direction. an injector having a plurality of obliquely extending mountain-shaped main convex stripes, mountain-shaped secondary convex stripes which cross the space extending between adjacent main convex stripes and divide the space into a plurality of quadrilateral regions, and mountain-shaped concave stripes which extend obliquely within each of the quadrilateral regions from one vertex to the other vertex of the quadrilateral in the same direction as the main convex stripes, and when the top wall is pressed, the peripheral wall is twisted and deformed, and the injection material contained within the container body swirls and flows under extrusion pressure and is discharged from the opening in the bottom wall.

2. 2. A method for reinforcing a concrete structure using the injector of claim 1, comprising the step of applying the sealant to shallow cracks on the surface of the concrete structure by puttying.

3. 2. A method for reinforcing a concrete structure using the injector according to claim 1, comprising the steps of removing the injector and the injection base after injection has been completed, and performing counter digging to excavate the injection material in the injection hole after removal to a predetermined depth from the surface.

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