# US 10,501,950 B2 · Method for injecting injection filler into concrete structure and syringe therefor

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- Number: US 10,501,950 B2
- Document ID: US10501950B2
- Status: Granted
- Kind: B2
- Application number: 15/220,712
- Filed: 2016-07-27
- Published: 2017-02-02
- Granted: 2019-12-10
- Earliest claimed: 2015-07-31
- Assignees: SG Engineering Corporation
- Applicants: SG Engineering Corporation
- Inventors: Junichi Kagawa
- Web page: https://patentgrep.com/patent/US10501950B2

## CPC

- E04G 23/0211: {using injection}
- B05C 17/0136: {comprising an energy storing element, e.g. a spring, for exerting, e.g. when released, pressure on the material (B05C17/015 takes precedence)}
- B29C 45/14631: {Coating reinforcements (fibre reinforcements B29C45/0005)}
- B29L 2031/776: {Walls, e.g. building panels}
- E04G: SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- B05C: APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (spraying apparatus, atomising apparatus, nozzles B05B; plant for applying liquids or other fluent materials to objects by electrostatic spraying B05B5/08)
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES

## Abstract

A container body including an expansion tube having a bellows-like wall surface is provided to be filled with an injection filler, the container body communicating with a base having an injection port for pressing the injection filler into a crack portion in a wall surface of concrete or the like via a bellows cap communicating with the body, and upon pressing the injection filler into the crack portion by an extrusion part from the injection port of the base, while the container body maintains a state where the injection filler is injected into the crack portion under pressure from an elastic body of the extrusion part, the injection filler remaining in the container body is manually pressed toward the injection port during a period of time when a state where the remaining injection filler is pressed in is maintained, and then the container body is removed from the base and replaced with a new container body to mount the new container body.

## Claims

### Claim 1

A syringe for injecting an injection filler into a crack, rock pocket, and a void portion around a steel bar in a concrete structure, the syringe comprising:
a container body (10), including an expansion tube having a bellows-like wall surface (10a), to be filled with an injection filler (X);
an external cylinder (30) at an outer perimeter of the container body (10); and
an injection/outlet (10b) of the container body (10) and a bellows cap (40) having a slit (42a), at one end of the external cylinder (30), the bellows cap (40) communicating with a base (20) having an injection port (21) for pressing the injection filler (X) in, the container body (10) including a rear end communicating with the injection/outlet (10b) by an extrusion part (50), the slit (42a) of the bellows cap (40), and the base (20), the injection filler (X) being pressed into a crack portion (B) by an elastic force of an elastic body (51) of the extrusion part (50), wherein
the container body (10) is provided at a distal end with the injection/outlet (10b),
the container body (10) is provided at the other end with a concave pressed portion (10c),
the pressed portion (10c) has a shape fitted to a convex extrusion portion (54) formed on a pressing plate (53) of an extrusion shaft portion (52) forming the extrusion part (50), and
the largest diameter of a first pleat (11a) nearest the injection/outlet (10b) at the bellows-like wall surface (10a) of the container body (10) is smaller than the largest diameter of a pleat located at the bellows-like wall surface (10a).

### Claim 2 (depends on 1)

The syringe for injecting an injection filler into a crack, rock pocket, and a void portion around a steel bar in a concrete structure according to claim 1, wherein
a wall surface (11b) leads from the first pleat to the injection/outlet (10b).

### Claim 3 (depends on 1)

The syringe for injecting an injection filler into a crack, rock pocket, and a void portion around a steel bar in a concrete structure according to claim 1, wherein
the external cylinder (30) is a housing being open at one end and being blocked by a blocking body (31) at the other end,
the open end of the external cylinder (30) includes a male thread around a perimeter thereof, the male thread being threadedly engaged with a female thread provided to an inner wall of an outer peripheral cover (41) of the bellows cap (40), and
the blocked other end of the external cylinder (30) includes an insertion hole (32) into which the extrusion shaft portion (52) is inserted in a movable manner, and inside the blocking body (31), a plurality of guide frames (33) having a length in an axial direction and being formed radially with respect to a major axis direction of the extrusion shaft portion (52).

### Claim 4 (depends on 1)

The syringe for injecting an injection filler into a crack, rock pocket, and a void portion around a steel bar in a concrete structure according to claim 1, wherein
the extrusion part (50) includes, at a distal end, the pressing plate (53) on which the convex extrusion portion (54) fitted to the pressed portion (10c) is formed, and an elastic body attachment projection (55), and the extrusion shaft portion (52) having a pull handle (56) at a rear end, and
the elastic body (51) is fitted to the extrusion shaft portion (52) and is press fitted between the pressing plate (53) and a blocking body (31) of the external cylinder (30).

### Claim 5 (depends on 1)

The syringe for injecting an injection filler into a crack, rock pocket, and a void portion around a steel bar in a concrete structure according to claim 1, wherein
the extrusion shaft portion (52) includes one or more pairs of guided vanes (57) at the middle of the shaft portion in a radial direction with respect to a major axis direction of the shaft portion, and
the guided vanes (57) are configured to be pulled to the outside of a blocking body (31) and configured to be rotated and fixed at an angle other than the insertion hole (32), and accordingly the elastic body (51) is configured to be compressed to press the injection filler (X) in the container body (10) into the crack portion (B).

### Claim 6 (depends on 1)

The syringe for injecting an injection filler into a crack, rock pocket, and a void portion around a steel bar in a concrete structure according to claim 1, wherein
a pull handle (56) is inserted in a rotatable manner into an end of the extrusion shaft portion (52), and is formed into a “D” shape with a straight rod (56a) longer than the dimension of the diameter of the external cylinder (30) and an arc-shaped rod (56b) whose ends are inserted into the straight rod.

### Claim 7 (depends on 1)

The syringe for injecting an injection filler into a crack, rock pocket, and a void portion around a steel bar in a concrete structure according to claim 1, wherein
a spacer (58) is provided between guided vanes (57) of the extrusion shaft portion (52) and a straight rod (56a) of a pull handle (56).

### Claim 8 (depends on 1)

The syringe for injecting an injection filler into a crack, rock pocket, and a void portion around a steel bar in a concrete structure according to claim 1, wherein the largest diameter of a last pleat having the pressed portion (10c) and nearest the convex extrusion portion (54) is smaller than the largest diameter of the pleat located at the bellows-like wall surface (10a).