JPH0355610Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an anchor bolt for a concrete bridge, and more specifically, to a girder that is embedded at one end in the seat of a pier of a concrete bridge and placed on top. The present invention relates to an anchor bolt whose other end is embedded in concrete cast at the end and is used to connect a bridge seat and concrete between girders.

[Conventional technology]

FIG. 3 shows a partial cross-sectional view showing the state of connection between the bridge seat 43 and the bridge girder 41. concrete bridge girder 41
The end portion of the bridge is placed on the bridge seat 43 with a shoe 42 placed over it so as to accommodate expansion and contraction of the girder due to load and temperature.

Between such girders 41, inter-girder concrete 44 is placed on the bridge seat 43. This concrete 44 is connected to the bridge seat 43 by an anchor bolt 10 embedded in the abutment and leg side at one end and embedded in the concrete 44 between the girders at the other end, but the load of the girder 41 mentioned above, Since it is necessary to absorb expansion and contraction due to temperature, this anchor bolt 10
As shown in FIG.
This pipe is filled with a flexible filler on site to allow relative movement between the bridge seat 43 and the concrete 44 between the girders.

The conventional construction of this anchor bolt 10 is as follows.

The anchor bar 1, which is made by cutting an anchor steel material to an appropriate length, is placed in the bridge seat 43 in an upright manner with the head thereof embedded in the concrete 44 between the bridge girders and protruding a desired length (50-100 cm). Embed. This embedding can be done by standing the anchor bar 1 upright and fixing it before pouring the concrete for the bridge seat 43, and then pouring the concrete, or by making an embedding hole in the poured concrete for the bridge seat 43, and then placing the anchor bar 1 in place. It may also be fixed using mortar inside.

Next, a pipe 2 having an inner diameter larger than the diameter of the anchor bar 1 can be placed over the head protrusion of the anchor bar 1. This pipe 2 is fixed so that its upper edge is slightly higher than the upper end of the anchor bar 1. In this case, it is necessary to match the center of the pipe 2 with the center of the steel bar 1.

Next, the pipe 2 is filled with a filler material. This filler is filled in the gap between the pipe 2 and the steel bar 1 and on the steel bar at the upper end of the pipe 2. The filler is an elastic material that is melted and poured.

Conventionally, the above-mentioned work has been carried out for each anchor bolt 10 by workers on the bridge abutments and piers at the site.

Installation of such an anchor bolt 10 is difficult and time-consuming in a very narrow space, and it is not easy to align the centers of the anchor bar 1 and the pipe 2, resulting in eccentricity in many cases. . This anchor bolt 10 needs to have flexibility when the bridge girder 41 expands and contracts due to load and temperature conditions, so it is inconvenient for the steel bar 1 and the pipe 2 to be eccentric, so it is necessary to align them. It was nearly impossible to carry out the construction, and it took a lot of effort.

[Problem that the invention attempts to solve]

The present invention aims to eliminate the above-mentioned conventional drawbacks by making such anchor bolts into products that can be mass-produced accurately and inexpensively under good control in factories. .

[Means for solving problems]

The present invention is an anchor bolt that connects the bridge seat of a concrete bridge and the concrete between the girders, and includes: 1. An anchor bar; 2. An anchor bolt that is externally fitted concentrically with the bar into the concrete buried part between the girders of the steel bar, and has a fixed dimension from the bar head. This is an anchor bolt for a concrete bridge, characterized in that a protruding pipe and an elastic filler filled in the pipe are integrally formed.

[Effect]

The anchor bolt of the present invention is a one-piece factory-fitted assembly.

(b) The relative position of the anchor steel and the external fitting pipe is assembled accurately, there is no eccentricity between the anchor steel and the external fitting pipe, the filler is uniformly filled in the gap, and the head of the anchor steel is A filling layer of appropriate thickness is also formed.

(b) Since it is a factory product, it has stable quality, saves labor, and can be mass-produced, which significantly reduces on-site work.

〔Example〕

An embodiment of the present invention will be described in detail along with a manufacturing method.

Figure 1 shows an embodiment of the anchor bolt 10 of the present invention, which includes a deformed reinforcing bar (anchor bar) 1 of 25 mmφ x 1200 mm and a 100 mmφ x 500 mm fitted externally.
It is constructed by integrally combining a pipe 2 and a filler 3 filled in this pipe 2. A pipe 2 is fitted around the deformed reinforcing bar 1 concentrically. The upper end of the pipe 2 protrudes from the head of the deformed reinforcing bar 1 by a certain distance 4.

FIGS. 2a to 2h are process diagrams showing the manufacturing process of the example. The method of manufacturing the anchor bolt 10 of the present invention is as follows.

(a) Place the anchor cap 11 made of hard rubber on the floor.

This anchor cap 11 has a short cylindrical protrusion 13 on one side of a flat base 12 into which the inner diameter of the pipe 2 fits, and a recess 14 into which the head of the deformed reinforcing bar 1 fits in the center of the protrusion. have. The height of the short cylindrical protrusion 13 is 35 mm in the example, and the recess 14 into which the head of the deformed reinforcing bar 1 fits
The depth is 10mm.

(b) Short cylindrical protrusion 13 of anchor cap 11
Fit one end of the pipe 2 to the

(c) Fit the pipe receiving flange 21 onto the deformed reinforcing bar 1.

(d) As shown in Fig. 2d, the pipe receiving flange 21 has a central through hole 22 in the center into which a deformed reinforcing bar is tightly fitted, and a pipe fitting circular recess 24 concentric with this hole is formed. . The inside of this circular recess is recessed in the shape of a conical or dome-shaped recess 23 .

(e) Insert the deformed reinforcing bar 1 into the pipe 2 in the state of step b above from the direction in which the end 5 of the pipe 2 fits into the circular recess 24 of the pipe receiving flange 21, and (f) Insert the inserted tip 6 into the anchor cap. into the central recess 14 of the pipe receiving flange 2.
1 circular recess 24 is inserted into pipe end 5 and brought into close contact.

(g) Next, erect the deformed reinforcing bar so that the anchor cap is on top and attach it to the pedestal 31 of the manufacturing device. This frame 31 includes a magnet 32 that holds the pipe 2 vertically, and has fixing parts 33 and 34 that fix the deformed reinforcing bars at two locations. This magnet and fixing part align the center of the deformed reinforcing bar and the pipe. In addition, this pedestal 31 has 10 to 20
It has a mounting part for attaching two anchor bolts at the same time.

(h) Next, remove the anchor cap 11 and inject the filler 3 into the pipe from above. After the filler 3 has solidified, the anchor bolt 10 is removed from the frame 31 and the centering flange 21 is removed.
There will be 10 anchor bolt products as shown in the figure.

Anchor cap 11 and centering flange 21 can be used repeatedly.

[Effect of idea]

Anchor bolts for concrete bridges according to the present invention can be manufactured accurately and inexpensively in a factory, eliminating the conventional labor-intensive work of on-site alignment, and correctly maintaining the performance of the bridge.

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional view of the anchor bolt of the present invention.
FIG. 2 is a manufacturing process diagram, and FIG. 3 is a cross-sectional view of the seat of a concrete bridge showing the state in which the anchor bolt is used. 1...Anchor steel bar (deformed reinforcing bar), 2...Pipe, 3...Filling material, 4...Dimensions, 5...Pipe end, 6...Insertion tip, 10...Anchor bolt,
11...Anchor cap, 12...Base, 1
3... Protrusion, 14... Recess, 21... Pipe receiving flange, 22... Center through hole, 23... Dome-shaped recess, 24... Circular recess, 31... Frame, 32...
...Magnet, 33, 34... Fixed part, 41...
Bridge girder, 42...Shuu, 43...Bridge seat, 44...
Inter-girder concrete.

Claims (1)

[Scope of utility model registration request] An anchor bolt that is buried in the bridge seat and the concrete between the girders of a concrete bridge to connect them, and which is fitted externally to the anchor bar and the part of the steel bar buried in the concrete between the girders, concentrically with the steel bar, and fixed from the head of the steel bar. An anchor bolt for a concrete bridge, characterized in that a dimensionally protruding pipe and an elastic filler filled in the pipe are integrally formed in advance.