JP6195732B2 - Concrete structure repair tool - Google Patents

Description

  The present invention relates to a repair tool for a concrete structure suitable for repairing cracks and breakage generated in a concrete structure such as a quay, a dike, a dam jetty, and a pier.

  Concrete structures such as quays, dikes, and dam jetty are composed of a combination of concrete and steel, but the concrete gradually becomes alkaline in contact with acid rain and atmospheric oxides. As the concrete is alkalized, the steel frame rusts, and when the rust expands further, the steel frame expands by about 9%. Finally, the concrete explodes due to the expansion pressure, and cracks and delamination form in the concrete structure. As a result, the strength of the concrete structure is lowered.

  As a method of repairing cracks and delamination of this concrete structure, conventionally, mortar is pressure-filled for cracks, mortar is applied for delamination, and mortar is filled by cutting the periphery including cracks into a concave shape. The method is done. In addition, as a repair method for the dike, there is a Gotoku stitch water-proof method. Before the pile member 10 is driven into the slope 2 around the crack 1, the tubular member 20 is driven to form the driving hole 19, and then the pile member 10. A technique for implementing the Gotoku sewing water-proofing method by driving in (Patent Document 1) has been proposed.

JP2011-111825A

  In the above-described prior art, the method of simply filling mortar into cracks and recesses cannot avoid the penetration of rainwater because the mortar covering the damaged portion is exposed, and is only a temporary repair and lacks durability. There is a problem. Further, there is a drawback that rusting of the bolts and nuts cannot be avoided even if the repair plate covering the damaged part is fixed to the concrete structure with metal bolts and nuts. Furthermore, in the Gotoku seaweed flood control method, the upper ends of a plurality of pile members driven into the slope are crossed and fastened with a string, and a sandbag as a weight is placed on the upper side from the fastening part. There are disadvantages that it cannot be used for repairing inclined surfaces, troublesome repair work, high costs, and lack of durability.

  The present invention has been made in view of the above-mentioned drawbacks of the prior art, and can repair cracks and breakage occurring in a concrete structure easily, quickly, and inexpensively, and can prevent the crack from expanding. An object of the present invention is to provide a repair tool for concrete structures.

The means of the present invention configured to solve the above-described problem is a repair tool for bringing a non-metallic cover plate covering a repaired portion of a concrete structure into close contact with the concrete structure, the concrete structure The planting bolt that is inserted into the object and supports the cover plate has an insertion portion extending from the intermediate portion of the cylindrical base body having the same diameter to the axial tip over the entire length , and the insertion portion has a locking groove on the outer peripheral surface. A plurality of posture holding pieces projectingly spaced apart in the circumferential direction and the axial direction, and the outer periphery of the intermediate portion protruding from the concrete structure to the other end in the axial direction as a screwed portion The nut has a configuration in which a male screw is formed on the surface, and the nut that is screwed to the planting bolt to bring the cover plate into close contact with the concrete structure is formed from a female screw that is screwed to the male screw on the inner peripheral surface. And the nut And implanting the bolt consists of those mortar molded.

  The locking groove may be formed in a plurality of annular grooves or spiral grooves that are spaced apart from each other in the axial direction in the insertion portion.

  The plurality of locking grooves formed of the annular groove may be communicated with each other through a mortar introduction groove.

  The mortar introduction groove may be formed in a state where the tip is opened at the tip of the insertion portion.

The posture holding piece may be formed as an upward inclined surface with the upper surface from the front end toward the rear end .

  Furthermore, a reinforcing material made of a non-metallic material may be mixed into the planting bolt and / or nut.

Since the present invention is configured as described above, the following effects can be obtained.
(1) The repaired part of the concrete structure was covered with a non-metallic cover plate, and the cover plate was fixed with mortar-shaped planting bolts and nuts so that no metal material was used . The conventional problem of exploding concrete structures due to the increase in volume of metal bolts and nuts can be completely eliminated, the durability of concrete structures can be greatly enhanced, and no discoloration due to rust red occurs. The situation that damages can also be eliminated. Moreover, the repair cost is low.
(2) Since the cover plate is configured to be supported by the nut on the planting bolt inserted into the concrete structure, the repair work can be performed in a short time and at a low cost.
(3) Since the mortar flows into the locking groove from the mortar introduction groove, the planting bolt can be securely and firmly fixed to the concrete structure.
(4) Since the plurality of locking grooves formed of the annular grooves communicate with each other through the mortar introduction groove, all the locking grooves can be filled with mortar, and the planting bolt is firmly fixed to the concrete structure. Can do.
(5) Since the introduction groove formed in the insertion portion is formed in a state opened at the tip of the cylindrical base body, each locking groove can be filled with mortar quickly and reliably, and the planting bolt is made of concrete. It can be firmly fixed to the structure.
(6) Since the planting bolt is provided with a plurality of posture holding pieces protruding on the outer circumferential surface of the insertion portion in the circumferential direction and the axial direction, it can be easily inserted into a concrete structure lacking slidability. Moreover, since each posture holding piece is engaged with the cured mortar, the planting bolt can be firmly fixed to the concrete structure.
(7) The planting bolt is formed on a cylindrical base body having the same diameter over the entire length, and has a shape in which a plurality of posture holding pieces project from the outer peripheral surface thereof. Therefore, the planting bolt is centered on the axis of the bolt insertion hole. By being held so that the line is along, it is firmly fixed in a stable state, and the cover plate can be reliably supported.
(8) Since the posture holding piece is formed as an upward inclined surface from the front end toward the rear end, the planting bolt lacking slidability can be easily inserted into the bolt insertion hole.
(9) Since the position of the planting bolt inserted around the repair location is fixed by the cover plate, it is possible to prevent the crack of the concrete structure from expanding.
(10) Since a reinforcing material made of a non-metallic material is mixed into the planting bolt and / or nut so as to have high strength, it is possible to prevent the expansion of cracks and damage of the concrete structure as much as possible. it can.

It is a side view which shows the whole structure of the repair tool for concrete structures which concerns on embodiment of this invention. It is a partial expansion perspective view of a repair tool. It is explanatory drawing of the use procedure of a repair tool. It is sectional drawing of the state which made the covering board closely_contact | adhere to a quay with a repair tool. It is a side view of the repair tool which concerns on a modification.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the figure, 1 is a planting bolt, and the planting bolt 1 is inserted into a bolt insertion hole 22 drilled in a quay wall 21 which is a concrete structure. Reference numeral 2 denotes a cylindrical base body constituting the planting bolt 1, and the cylindrical base body 2 is made of mortar molded by hardening cement, and is formed to have substantially the same diameter over the entire length. Reference numeral 3 denotes an insertion portion formed on the columnar base 2, and the insertion portion 3 is a portion from the axial intermediate portion 2A to the tip 2B of the columnar base 2, and the outer peripheral surface 3A has a substantially bowl-shaped cross section. Three locking grooves 3B, 3B, 3B made of annular grooves are formed apart in the axial direction.

  4, 4,... Are a plurality of posture holding pieces that are positioned between the locking grooves 3 </ b> B, 3 </ b> B, and 3 </ b> B and project from the outer peripheral surface 3 </ b> A of the insertion portion 3 so as to be spaced apart in the circumferential direction and axial direction. Show. Each of the posture holding pieces 4 is for holding the axis of the bolt insertion hole 22 so that the center line of the planting bolt 1 is along the upper surface 4A with an upward inclined surface from the front end toward the rear end. It is designed to be easily inserted into the bolt insertion hole 22.

Note that the posture holding piece 4 may be formed integrally with the columnar substrate 2 with mortar, or may be formed with a synthetic resin material and implanted when the columnar substrate 2 is formed. Alternatively, a holding piece structure formed by separating three synthetic resin plates having the upper end side as the posture holding piece 4 at 120 degrees in the circumferential direction may be molded and integrated when the cylindrical substrate 2 is molded.

Reference numeral 5 denotes a screwed portion formed on the columnar base 2. The screwed portion 5 is a portion from the intermediate portion 2A to the rear end 2C of the columnar base 2, and a male screw 5B is formed on the entire outer peripheral surface 5A. It is.
Thus, the planting bolt 1 has the insertion part 3 on the axial tip 2B side from the intermediate part 2A of the cylindrical base 2 made of mortar, and the posture holding piece 4 is disposed on the outer peripheral surface 3A of the insertion part 3; Although the rear end 2C side is configured to be the screwing portion 5, the length and diameter thereof may be variously set so as to correspond to the size and thickness of the cover plate 24 to be supported.

  Reference numeral 6 denotes a mortar hex nut screwed onto the planting bolt 1. Reference numeral 7 denotes a nut main body constituting the hexagonal nut 6. The nut main body 7 has an outer peripheral surface 7A formed on six surfaces so that a spanner can be easily applied, and a female screw 7C is formed in the bolt fitting hole 7B. It consists of what was screwed together. Reference numerals 8 and 8 denote pin insertion holes formed outside the bolt fitting holes 7B and penetrating in the axial direction of the nut body 7. The pin 6 is inserted into each pin insertion hole 8, and the end of the rotation stop pin 9 is driven into the cover plate 24 to prevent the nut 6 from loosening.

  Although the repair tool which consists of this Embodiment consists of the above-mentioned structure, the effect | action is demonstrated with reference to FIG.3 and FIG.4 next. For example, when repairing the damaged recess 21A formed in the quay 21, a plurality of bolt insertion holes 22, 22,... Are drilled so as to surround the damaged recess 21A, and each bolt is inserted. The inside of the hole 22 and the repair location 21A of the quay 21 are filled with mortar 23 with an injection gun G, and the planting bolt 1 is inserted while being pressed. Since the mortar 23 in the bolt insertion hole 22 is cured, the planted bolt 1 is firmly attached to the quay wall 21.

On the other hand, bolt through holes 24A, 24A,... For inserting the planting bolt 1 are formed in a non-metallic cover plate 24 made of concrete or synthetic resin, and the cover plate 24 is inserted into the planting bolt 1. Then, the hexagon nut 6 is screwed and fastened. In this manner, the cover plate 24 is brought into close contact with the quay 21 while covering the damaged recess 21A, so that the mortar 23 filled in the damaged recess 21A is not directly exposed to rainwater or snowfall. Since the surrounding deteriorated part is also covered, durability can be given. And it can also suppress that the crack of the quay wall 21 expands because the cover board 24 connects the several planting bolts 1, 1, and ... integrally.

In the above operation, the bolt insertion hole 22 is formed on the pier 21 so that the mortar implantation bolt 1 having poor slidability can be inserted into the quay 21 which is a concrete structure lacking slidability. The diameter is set somewhat larger than the diameter. However, since the screwed portion 5 that is approximately half the length of the implanted bolt 1 protrudes downward from the quay wall 21 with respect to the wall surface, the position with respect to the bolt through hole 24A is displaced and difficult to pass. Arise. Therefore, a plurality of posture holding pieces 4 are provided on the outer side of the planting bolt 1 so as to be separated from each other in the circumferential direction and the axial direction, and each posture holding piece 4 is in contact with the inner surface of the bolt insertion hole 22 so The implantation bolt 1 can be easily inserted into the bolt insertion hole 22 by making the contact surface as small as possible. In addition, since the mortar 23 that has bitten each posture holding piece 4 is hardened, the planting bolt 1 can be firmly planted by the quay 21.

The locking groove 3B in the present embodiment may be a spiral groove instead of the annular groove. Even if it does in this way, since the mortar 23 flows in into a spiral groove and covers the whole surface of the insertion part 3, the planting bolt 1 can be fixed to the quay 21 reliably.

  Next, a modification of this embodiment is shown in FIG. In the figure, reference numeral 11 denotes a vegetation bolt, and the vegetation bolt 11 is formed by forming an insertion portion 13 and a screwing portion 14 on a columnar base 12 made of mortar. Three annular locking grooves 13B, 13B, and 13B are formed on the outer peripheral surface 13A of the insertion portion 13. Reference numeral 14 denotes an introduction groove formed in the axial direction in communication with the annular locking groove 13 </ b> B. The introduction groove 14 has a distal end 14 </ b> A opened at the distal end of the insertion portion 13.

  According to the present embodiment, since the introduction groove 14 is formed in the insertion portion 13, when the insertion portion 13 is inserted in a state where the bolt insertion hole 22 is filled with the mortar 23, the mortar 23 passes through the introduction groove 14. Therefore, the planting bolt 11 can be firmly fixed to the quay wall 21 because it surely flows into all the annular locking grooves 13B.

  In the present invention, when the planting bolt 1 and the hexagon nut 6 are mortar-molded, the strength is increased by mixing a reinforcing material made of a non-metallic fiber material such as glass fiber or carbon fiber into cement. Good.

DESCRIPTION OF SYMBOLS 1,11 Implanted bolt 2,12 Cylindrical base | substrate 2A Intermediate part 2B End 2C Rear end 3,13 Insertion part 3A, 13A Outer peripheral surface 3B, 13B Locking groove 4 Posture holding piece 5,14 Threaded part 5A Outer peripheral surface 5B Female thread 6 Hexagon nut 6B Inner peripheral surface 6C Female thread 14 Introduction groove 21 Quay wall (concrete structure)
24 Cover plate

Claims (6)

A repairing tool for bringing a non-metallic covering plate covering a repaired portion of a concrete structure into close contact with the concrete structure, and the planting bolt that is inserted into the concrete structure and supports the covering plate is A cylindrical base having the same diameter over the entire length from the intermediate portion to the tip in the axial direction, and the insertion portion forms a locking groove on the outer peripheral surface and is spaced apart in the circumferential direction and the axial direction. It has a configuration in which a posture holding piece is protruded, and a male screw is formed on the outer peripheral surface of the intermediate portion protruding from the concrete structure and the other end in the axial direction as a screwed portion. The nut that is attached to bring the cover plate into close contact with the concrete structure is formed by forming an internal thread on the inner peripheral surface of the external thread, and the nut and the planting bolt are mortar molded concrete. Doo-made structures for repair tool.   The repair tool for a concrete structure according to claim 1, wherein the locking groove includes a plurality of annular grooves or spiral grooves that are spaced apart from each other in the axial direction in the insertion portion.   The repair tool for a concrete structure according to claim 2, wherein the plurality of locking grooves formed of the annular grooves are communicated with each other through mortar introduction grooves.   4. The repair tool for a concrete structure according to claim 3, wherein the mortar introduction groove is formed in a state in which a tip is opened at a tip of the insertion portion. The repair tool for a concrete structure according to claim 1 , wherein the posture holding piece is formed as an upward inclined surface with the upper surface from the front end toward the rear end .   The repair tool for a concrete structure according to claim 1, wherein the planting bolt and / or nut is mixed with a reinforcing material made of a non-metallic material.

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