JP2013087496A - Fixing jig for upward thickening method, and upward thickening method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and a method capable of surely fixing a reinforcing bar by preventing leakage of a filler in an upward thickening method.SOLUTION: A fixing jig is for the upward thickening method for reinforcing a concrete structure by inserting a reinforcing bar and injecting a filler to an upward insertion hole formed by drilling the concrete structure, and comprises: a base plate which has an opening for inserting the reinforcing bar, is composed of a pair of division bodies divided so as to be over the opening, and is attached to the concrete structure such that the respective division bodies are freely brought close to each other or separated so as to enlarge or reduce the opening; and at least one fixture which regulates the movement of the pair of division bodies. By making a diameter of the opening smaller than a diameter of the insertion hole when the pair of division bodies are brought close, a part of the insertion hole is closed and the excess leakage of the filler is prevented.

Description

  The present invention relates to a fixing jig used in a so-called upward thickening method and an upward thickening method using the fixing jig.

  The upward thickening method is a method of reinforcing an existing concrete structure with a thickening method from below. More specifically, a concrete structure is fixed by inserting a reinforcing bar and injecting a filler into an upward insertion hole formed by drilling the lower surface of the concrete structure upward. It is a construction method to reinforce.

A fixing method using a capsule is known as a fixing method of reinforcing reinforcing bars in the conventional upward thickening method. The procedure of the construction method will be described with reference to FIG.
1st process: The lower surface of a concrete structure is drilled and the insertion hole a is formed.
Second step: A capsule b containing a filler such as an organic adhesive or an inorganic mortar is inserted into the insertion hole a.
Third step: The reinforcing reinforcing bar c having a sharp tip is inserted into the insertion hole a, the capsule b is broken at the tip portion, and the filler is leaked into the insertion hole a.
Fourth step: The reinforcing reinforcing bar c is inserted to a predetermined position.

  In addition, methods described in the following patent documents are known.

JP 2004-162295 A JP 2010-185247 A JP-A-10-102600

However, the fixing method using the capsule has the following problems.
(1) The shape of the tip portion of the reinforcing steel bar is limited.
(2) After breaking the capsule, the filler leaks out of the insertion hole due to gravity, and if the leakage amount is too large, the fixing performance may be lowered.

  Accordingly, it is an object of the present invention to provide an apparatus and a method capable of more reliably fixing a reinforcing bar by preventing leakage of a filler as compared with the prior art. It is.

  The first invention of the present application, which has been made to solve the above problems, reinforces a concrete structure by inserting a reinforcing bar and injecting a filler into an upward insertion hole formed by drilling a concrete structure. The fixing jig for the upward thickening method has an opening for inserting the reinforcing reinforcing bar, and is composed of a pair of divided bodies that are divided so as to straddle the opening, and expands and contracts the opening. As described above, each divided body is attached to a concrete structure so as to be close to or separated from each other, and includes a base plate and at least one fixing device for restricting movement of the pair of divided bodies, and the pair of divided bodies The fixing jig for the upward thickening method is provided, characterized in that the diameter of the opening is smaller than the diameter of the insertion hole.

  Further, according to a second invention of the present application, in the first invention, the fixing device is rotatably attached to one divided body and can be locked to the other divided body when each divided body approaches. It is characterized by this.

  The third invention of the present application is characterized in that, in the second invention, two fixing tools are provided, and each fixing tool is arranged so as to sandwich a reinforcing steel bar.

  Further, the fourth invention of the present application is an upward thickening method in which a concrete structure is reinforced by inserting reinforcing steel bars and injecting a filler into an insertion hole formed by drilling a concrete structure upward. A) When the fixing jig according to any one of the above inventions is arranged around the drilled hole portion, each divided body constituting the base plate is pulled apart to expose the insertion hole, and b) Injecting filler into the insertion hole, c) inserting a part of the reinforcing bar into the insertion hole, d) pulling the divided bodies and then restricting the movement of the divided bodies with the fixture, The base plate is fixed to a concrete structure in a state where a gap is provided between the insertion hole and the opening while a part of the insertion hole is closed. E) The gap is obtained by reinserting the reinforcing reinforcing bar. Leakage of excess filler material through the Characterized in that it comprises the at Ku, there is provided an upward increase thickness method.

According to the present invention, at least one of the following effects can be obtained.
(1) Since the fixing jig prevents excessive leakage of the filler, it contributes to secure fixing of the reinforcing steel bars.
(2) Since the fixing jig does not interfere with the insertion work of the reinforcing reinforcing bars, the workability is not deteriorated.

The disassembled perspective view of the fixing jig of this invention. The bottom view which shows the relationship between the opening part and insertion hole accompanying a movement of a division body. The schematic perspective view which shows another Example of a baseplate. The bottom view which shows the relationship between an opening part and a fixing tool, and a reinforcement reinforcing bar after latching of a fixing tool. The figure which shows the procedure of the upward thickening construction method of this invention. The figure which shows the procedure of a conventional construction method.

  Embodiments of the fixing jig and its usage according to the present invention will be described below with reference to the drawings.

<1> Fixing jig An embodiment of the fixing jig of the present invention will be described with reference to FIGS.

(1) Outline FIG. 1 is an exploded perspective view of a fixing jig of the present invention.
The fixing jig is a member for preventing the filler from excessively leaking from the insertion hole.
The fixing jig A includes at least a base plate 1 disposed in the vicinity of the insertion hole B1 and a fixture 2 for restricting movement of the base plate 1.
Hereinafter, each member will be described.

(2) Base plate The base plate 1 is a member for exposing the entire insertion hole B1 or closing a part of the insertion hole B1 in plan view.
The base plate 1 can be composed of a flat plate member.

[Aperture]
The base plate 1 has an opening 11 formed through the base plate 1 vertically.
The opening 11 has a size that allows at least the reinforcing reinforcing bar C to be inserted, and the opening 11 may be configured such that the diameter of the opening is smaller than the diameter of the insertion hole B1, and the shape is particularly limited. do not do.

[Division of base plate]
The base plate 1 can be constituted by a pair of divided bodies that are divided so as to straddle the opening 11.
In addition, in FIG. 1, although comprised with the two division bodies 1a and 1b divided | segmented into the longitudinal direction of the baseplate 1, the division | segmentation number is not restricted to two, You may comprise with three or more division bodies.

[Attaching the base plate]
The divided bodies 1a and 1b constituting the base plate 1 are individually attached to the concrete structure so as to be close to or separated from each other.
As a method of attaching each divided body, a sliding groove 12 that can slide in the direction in which each divided body approaches or separates is provided in each divided body, and is attached to the concrete structure B with the bolt 13 via the sliding groove 12. There is a way.
At this time, if the bolt 13 is loosened, the bolt 13 slides on the sliding groove to allow the movement of the divided body, and if the bolt 13 is tightened, the movement of the divided body is restricted and positioned.

[Relationship between opening and insertion hole]
In FIG. 2, the relationship between an opening part and an insertion hole accompanying the movement of a division body is shown.
By making the base plate 1 have the above-described sliding structure, the openings 11 can be expanded and contracted as the divided bodies 1a and 1b approach or separate from each other by appropriately moving the divided bodies 1a and 1b in the plane direction. It becomes possible.
That is, when the divided bodies 1a and 1b are separated and separated, the opening 11 exhibits a state in which the insertion hole B1 is completely exposed, and when the divided bodies 1a and 1b are pulled and integrated, the opening 11 wraps and closes a part of the insertion hole B1, and presents a state as if the insertion hole is reduced in plan view.

[Formation of elastic layer]
FIG. 3 shows another embodiment of the base plate.
As shown in FIG. 3A, an elastic layer 15 such as rubber may be formed on the upper surface of each of the divided bodies 1a and 1b. This is to make the contact between the concrete structure and the base plate 1 better.
In addition, as shown in FIG. 3B, the elastic layer 16 may be formed on the divided surfaces of the divided bodies 1a and 1b. This is to further suppress the generation of a gap between the divided surfaces when the divided bodies are brought close to each other, and to prevent the filler from leaking from the gap.
The base plate 1 according to the present invention may further be configured by combining FIGS. 3 (a) and 3 (b).

(3) Fixing tool Details of the fixing tool will be described with reference to FIG. 1 again.
The fixture is a member for restricting movement of the base plate at least at a position where the base plate closes the insertion hole.
The fixture 2 can be attached so as to straddle each of the divided bodies 1a and 1b constituting the base plate 1, thereby restricting the movement of the divided bodies 1a and 1b.
For example, one end of the fixture 2 is provided with a through hole 21 into which a bolt 14 provided on the lower surface of one divided body 1a can be inserted, and the other end is provided with a bolt 14 provided on the lower surface of the other divided body 1b. A lockable collar portion 22 is provided.
The fixing tool 2 is fixed to the bolts 14 provided in the respective divided bodies 1a and 1b by fastening with nuts 3 from the lower surface side of the fixing tool 2.

[shape]
The fixture 2 has a shape that does not interfere with the inserted reinforcing steel bar C when the collar portion 22 is locked to the other divided body 1b. In the present embodiment, the fixture 2 is formed in a substantially U-shape when viewed in plan, and the through holes 21 or the flanges 22 are provided at both end portions, while detouring around the side surface of the reinforcing bar C, The divided body 1a is extended to the other divided body 1b.

[Number of fixtures]
The number of fixtures 2 in the present invention is not particularly limited.
In FIG. 1, two fixing tools 2 are provided so as to be symmetric, and each of the fixing tools 2 is rotatably attached to a bolt 14 provided on one divided body 1 a, and the reinforcing steel bars C are sandwiched from the front-rear direction. In this manner, the reinforcing reinforcing bar C exposed from the insertion hole B1 is pressed down by engaging with the other divided body 1b.

[Relationship with reinforcing bars]
In FIG. 4, the relationship between an opening part and a fixing tool and a reinforcing steel bar after latching of a fixing tool is shown.
As shown in FIG. 4, since the diameter of the opening 11 of the base plate 1 is smaller than the diameter of the insertion hole B1 after the fixing device 2 is locked, the opening 11 and the reinforcing reinforcing bar A gap 111 is formed between C and C. This gap 111 becomes a leakage outlet for excess filler.
Further, if the shielding part 112 that shields a part of the upper part and the lower part of the insertion hole B1 is formed with the main body of the fixing tool 2 after the fixing tool 2 is locked, the gap 111 is further narrowed. Can do.
Moreover, if the surface (contact surface 23) which contact | connects the reinforcement reinforcing bar C is formed in an arc shape among the inner surfaces of the fixing tool 2, since the fixing tool 2 and the reinforcing reinforcement C are in surface contact, the pressing down of the reinforcing reinforcement C is performed. It can also be effective.

<2> Usage Method Next, an example of the upward thickening method using the fixing jig will be described with reference to FIG.

(1) Installation of drilling / fixing jig The lower surface of the concrete structure B is drilled upward to form an upward insertion hole B1.
Then, the fixing jig A is attached around the insertion hole B1.
At this time, the divided bodies 1a and 1b constituting the base plate 1 are separated from each other, thereby expanding the opening 11 and exposing the insertion hole B1. This is for inserting a filling material injection device, which will be described later, and it is not necessary to completely expose the insertion hole B1 as long as the injection device can be inserted.

(2) Filler Injection The filler injection device is inserted through the exposed insertion hole B1, and the filler D is injected into the insertion hole B1.
As the type of the filler D, a known filler such as an organic adhesive or an inorganic mortar can be appropriately selected and used.

(3) Initial insertion of reinforcing steel bars Next, the tip of the reinforcing steel bars C is inserted into the insertion hole B1.
The reinforcing steel bars C include known buried materials used for reinforcing concrete structures such as post head bars and anchors.
In this embodiment, a post head bar is assumed for the reinforcing steel bars C.

(4) Closure of fixing jig When the reinforcing reinforcing bar C is inserted into the insertion hole B1 to some extent, each of the divided bodies 1a and 1b constituting the base plate 1 is pulled close to close a part of the opening of the insertion hole B1.
At this time, the gap 111 between the opening 11 of the base plate 1 and the reinforcing reinforcing bar C becomes a region that communicates with the outside, and the communication region is substantially narrowed by pulling each of the divided bodies 1a and 1b. By narrowing the communication area, the action of the filler D inside the insertion hole B1 leaking out due to its own weight can be suppressed to some extent.

(5) Reinsertion of reinforcing bar Next, the reinforcing bar C is pushed in again, and the insertion is resumed.
Due to the reduction of the filling space inside the insertion hole B1 due to the insertion of the reinforcing steel bars C, the excess filler material D1 leaks to the outside through the gap 111.
The gap 111 may be a gap that allows the excess filler D1 to leak out.

(6) Closing the gap After the re-insertion of the reinforcing steel bars C is completed, the gap 111 is closed.
As the closing method, a known padding material such as rubber can be used.
In addition, when the said filling material D is tightly packed also in the gap | interval 111, it is not necessary to block | close newly.

  By the above steps, according to the present invention, the fixing jig A suppresses the excessive leakage of the filler D, and visually confirms the leakage of the excessive filler D1 due to the insertion of the reinforcing bar C. Thus, reliable fixing of the reinforcing steel bars C can be secured.

A Fixing jig 1 Base plate 1a, 1b Divider 11 Opening 111 Gap 112 Shielding part 12 Sliding groove 13, 14 Bolt 15, 16 Fan noodle 2 Fixing tool 21 Through hole 22 Hut 3 Nut B Concrete structure B1 Insertion Hole C Reinforcing bar D Filler D1 Excess filler a Insert hole b Capsule c Reinforcing bar

Claims (4)

A fixing jig for an upward thickening method that reinforces a concrete structure by inserting reinforcing steel bars and injecting filler into an upward insertion hole formed by drilling a concrete structure,
Concrete which has an opening for inserting the reinforcing reinforcing bar and is divided into a pair so as to straddle the opening, and each of the divided bodies can be approached or separated from each other so as to expand and contract the opening. A base plate attached to the structure;
And at least one fixture that regulates the movement of the pair of divided bodies,
In the approach of the pair of divided bodies, the diameter of the opening is configured to be smaller than the diameter of the insertion hole,
Fixing jig for upward thickening method.   The upward thickening according to claim 1, wherein the fixing member is rotatably attached to one divided body and is configured to be able to be locked to the other divided body when approaching each divided body. Fixing jig for construction method.   The fixing jig for the upward thickening method according to claim 2, wherein two fixing tools are provided, and each fixing tool is arranged so as to sandwich a reinforcing steel bar. An upward thickening method that reinforces a concrete structure by inserting reinforcing steel bars and injecting filler into an insertion hole formed by drilling a concrete structure upward,
a) When the fixing jig according to any one of claims 1 to 3 is disposed around the hole portion, each divided body constituting the base plate is pulled apart so that the insertion hole is exposed,
b) Injecting filler into the insertion hole;
c) Insert a part of the reinforcing reinforcing bar into the insertion hole,
d) In a state in which the movement of each divided body is restricted by the fixing tool after the respective divided bodies are drawn, and a gap is provided between the insertion hole and the opening while closing a part of the insertion hole Fixing the base plate to a concrete structure;
e) Leakage of excess filler material through the gap by reinsertion of the reinforcing reinforcing bars.
An upward thickening method characterized by including at least a process.

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