JPS60133105A - Bridge leg reinforcing method and segment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of reinforcing a bridge pier, and more particularly to a method of reinforcing a bridge pier using a jacket segment, and the jacket segment.

After bridge piers are constructed, if the surrounding riverbed declines and the root length of the foundation becomes short, the piers may tilt due to scouring during floods, causing the bridge to cease functioning.

In order to increase the river area for the Mako River, it becomes necessary to dig down the riverbed, which may require reinforcement of bridge foundations.

Conventionally, methods for reinforcing such bridge piers have been adopted, such as foundation block insertion to prevent scouring and outer deck pile N1, but these have not been sufficiently effective.

An object of the present invention is to protect and strengthen an existing pier by surrounding it with a foundation wall that has deep joists and is strong.

The present invention uses a frame-shaped segment with an open top and bottom and a cutting edge segment with a cutting edge plate protruding from the bottom in an eight-shape,
The segments are assembled into a cylindrical shape around the pier, and the segments are sequentially lowered to fill the inner space with concrete, creating a strong wall f.
：Construction and its embodiment will be explained with reference to the drawings.

First, to describe the structure of the segment, as shown in Fig. 1, segment 1 consists of an outer plate la formed of a material that can withstand lateral pressure, an inner plate 1b, and both gray plates la,
The small end play that becomes the bulkhead member of lb) IC, IC'
The four plates are assembled into a rectangular frame shape with the top and bottom open, and the 10° IC' has window holes 1d and ld' for the passage of the diver.

The side plate 1b is curved.

In addition, the blade mouth segment 2 is lower in height than the segment 1, and is provided at the slit 2et-travel distance between the outer plate 2a and the inner plate 2bK, which serve as water holes, and is υ outward from the lower edge of both plates 2a and 2b. (cutting edge play that overhangs)
2d and 2d' are protruded in a figure eight shape, and on both left and right ends there are reinforcing lips 2b=r that are in contact with the ends of 2e and 2e'.
It was established.

The above two segments 1 and 2 are joined in an annular manner around the pier foundation by welding, bolting, or a combination of both to form a cylindrical body B. This cylindrical body B is an outside play)1
A creates an outer wall 0, an inner wall 1b creates a working space m, and both sides of the cylindrical wall 0. DK replacement gravel is piled up, a diver 40 works from the hollow part of the segment to excavate the gravel at the bottom of the lowest cutting edge segment 2, and in parallel with this, the water inside the cylindrical body is pumped up with an underwater bonder 5.
The water will be discharged onto the replacement gravel on the bridge piers.

This lowers the internal water level of the cylindrical body B, so the water outside the cylindrical body flows into the cylindrical body through the displacement gravel 7 and the slit 2C, and the movement of the inflow water creates a downward flow on the outer wall of the cylindrical body. arise,
The synergistic effect of the downward flow and displacement gravel reduces circumferential friction,
The cylindrical body sinks without damaging the existing piers. That is, the cutting edge play) 2 d, 2 d' digs, and the replacement gravel 7 is thrown into the gap created inside and outside the cylindrical body B. With the excavation, the replacement gravel immediately settles and fills the gap between the cylindrical body B and the ground. (This construction method utilizes the subsidence construction method for structural foundation materials disclosed in Patent No. 92948M, which was previously completed by the present inventor.) After the ftJ-shaped body is sunk, the inside of the cylindrical body is filled with underwater concrete T-fill, and the pier foundation is At-enclose and build a new cylinder. The wall friction is further reduced due to the downward flow of the replacement gravel, and the cylindrical body sinks due to its own weight, but if the sinking edge due to its own weight is insufficient, the girder 8t is fixed to the existing pier foundation, and the cylindrical body is fixed to the existing pier foundation. Push it in.

After settling is completed, the void inside the cylindrical body is filled with concrete and mortar is injected into the replacement gravel. The segments exposed above the river bed are then dismantled and removed. In the figure, 10 indicates the water surface during work, 11 indicates the riverbed, and 12 indicates the existing bridge girder.

According to the present invention, the piers are reliably reinforced, and the protection of the piers can be strengthened.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a segment used in the bridge pier reinforcement method according to the present invention, FIG. 2 is a perspective view of a blade mouth segment,
FIG. 3 is a plan view showing an embodiment of the pier reinforcement method according to the present invention, FIG. 4 is a longitudinal front view, and FIG. 5 is a longitudinal front view showing a state in which the cylindrical body is forcibly lowered. A...lii leg B...cylindrical body 1...segment 2...blade mouth segment Patent applicant Shimauchi Shubu Department Shimauchi Dai 2 Department Ken] 11) 1 Figure i Figure 2

Claims (2)

[Claims] (1) A cylindrical body made up of frame-shaped segments surrounding the periphery of the pier is sequentially lowered, and then the cylindrical body is filled horizontally with concrete and mortar is injected on the outside to construct a reinforcing wall. What to do - Characteristic bridge pier reinforcement method. (2) Outer plate, inner plate, and small plate for forming a gap between both plates) Assemble into a frame shape so that the top and bottom are open, and the small plate has a segment with a window hole for entry and exit of the diver, and a segment at the bottom end. A bridge pier reinforcement segment consisting of a cutting edge grating and a cutting edge segment that protrudes in a figure-eight shape.