JP3020023B2 - Structure removal method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing a structure such as a pier.

[0002]

2. Description of the Related Art A viaduct structure such as an overhead line or a highway shown in FIGS. 16 and 17 and comprising a bridge pier 1 and a bridge girder 2 of a bridge is damaged by an earthquake or the like, and the middle of the pier 1 is greatly damaged (α). In some cases, it may be necessary to dismantle and remove the whole as irreparable.

[0003] Such dismantling / removal is conventionally performed by installing a total scaffold and a shoring in accordance with the shape of the pier 1 which is a conventional structure, and then cutting it off with a wire saw and removing it with a large crane. They had been removed from the top due to breaker destruction.

[0004]

However, there is a bridge girder 2 in the sky above, and large cranes for removing structures are used where general roads and private houses are adjacent on both sides. Cannot be placed.

[0005] On the other hand, even if a place where a large crane can be arranged can be secured, the structure is large, and if the removed lump is enlarged, the cost of the lifting machine is increased. In any case, construction costs are high.

[0006] In the method of breaking concrete by hand cutting or a breaker, the work is performed from the upper part. However, it is necessary to provide scattering curing equipment and dust curing equipment from the bottom to the top. Then it is necessary to temporarily expand the construction site.

In addition, since scaffolding scaffolds need to be rearranged at a considerable frequency, dangerous work at high places tends to increase.

An object of the present invention is to eliminate the disadvantages of the prior art and to reduce the number of curing equipment and safety equipment by performing the main dismantling work at a low place near the ground, thereby improving the safety and efficiency of construction work for workers. An object of the present invention is to provide an inexpensive and rational structure removing method which can be improved, can be constructed with a relatively small lifting machine, does not require a frame support, and is inexpensive.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention firstly assembles a support base along a portion where a structure is to be removed, and installs a jack device on the upper end of the support base. And place the core over the part to be removed.
And a sheath tube is provided in the core hole.
Side porosity is filled with non-shrink mortar, and
Suspension that reinforced the bearing area with an iron plate and inserted into the core hole
Connect the pin to the tension rod, and
The jack is suspended by the jack device, the lower part of the part to be removed is cut into a block, and the removed lump is carried out.
The gist of the invention is to repeatedly lower the portion to be removed by the jack device, cut in a block shape, and carry out the removed removed lump.

Secondly, a carrier frame extending in the horizontal direction is assembled on the supporting frame that stands up, and the carrier is movably installed on the carrier, and the removed cart is transferred by the carrier. Third, The gist of the invention is that cutting is performed in advance of core boring of a wire through hole and a reinforcing bar cutting hole, and a diamond wire saw and a pulley are attached to a skeleton for a cut surface to perform the wire saw cutting.

According to the first aspect of the present invention, the lower part of the part to be removed is sequentially cut into blocks at a low place near the ground, so that curing equipment and safety equipment can be reduced. In addition, since work at heights is reduced as much as possible, the safety of workers is also improved. Furthermore, the removal of the removed lump is also performed in low places, the lifting machine can be constructed with a relatively small size, and no framing support is required.

Moreover, by inserting the suspension pin into the upper part of the part to be removed, the tension rod can be securely and easily connected to the upper part of the part to be removed.

In addition to this, since the hanging pins continue to receive the entire weight of the structure from the first cutting until the removal of all the blocks, a large bearing pressure is generated at the upper portion of the pin hole, and the hanging pin is formed in the concrete portion of the frame. Defects and the like are expected, but the occurrence of such defects can be prevented by integrating the sheath tube and reinforcing the iron plate.

According to the second aspect of the present invention, in addition to the above-mentioned operation, it is possible to carry out the cut-out removed lump with a transport trolley in a functional and efficient manner.

According to the third aspect of the present invention, cutting is performed with a diamond wire saw, but by cutting the diamond wire saw through a wire passage hole, the cutting time can be reduced.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view showing one embodiment of the structure removing method of the present invention, FIG.
FIG. 3 is a perspective view of the same, showing a case where a viaduct structure including a pier 1 and a bridge girder 2 of a bridge as shown in FIGS. 16 and 17 is dismantled.

FIG. 15 shows a work flow showing one embodiment of the method of the present invention, and roughly includes a foundation work, a gantry assembling work, a cutting preparation work, a cutting and removing work, a gantry dismantling work, and a removed lump breaking work. It consists of a process.

Each of these will be described in sequence. The foundation work is to cast concrete for the foundation of a pier temporary support base, which will be described later. Although not shown, a concrete foundation is cast on the footing (see FIG. 17) of the foundation of the pier 1.

Next, as shown in FIG. 4, an assembling work is performed to assemble the supporting gantry 4 along the pier 1 where the structure is to be removed. The supporting gantry 4 includes the base frame 4a and the intermediate frame. It comprises a frame 4b, a mast frame 4c, and a top frame 4d (step). In particular, the pier 1 is assembled so as to sandwich the pier 1 on the front and rear sides (in the direction in which the girder extends) of the pier 1. A guide roller 5 is attached to the pier 1, and the pier 1 is brought into contact therewith.

Further, a transport gantry 6 extending horizontally in the direction in which the left and right piers 1 are arranged is assembled on the support gantry 4, and a transport trolley 7 is movably mounted on the transport gantry 6.

Next, a cutting preparatory work is performed, and blackout is performed.
Core boring for pins is performed on the upper part of the pier 1 to pierce the suspension core 9 (see FIG. 14), and the jack device 10 is installed as shown in FIG. 5 (step). Further, in order to secure the stability of the frame immediately after the lower portion is cut off and trimmed as described later, a vibration damper is provided with a steel material such as the stay wire 8 or the like. This also serves as a guide when jacking down.

A hanging pin 11 is inserted and installed in the hanging core 9. The details are shown in FIGS. 13 and 14. After drilling the hanging core 9, a sheath tube 12 is provided in the hole. The outer voids are filled with non-shrink mortar 13 to achieve integration. Further, a reinforcing iron plate 14 was fixed to the outside of the bearing with a chemical anchor 15 for reinforcement. In the drawing, reference numeral 16 denotes a clevis provided at an end of the suspension pin 11, and reference numeral 17 denotes a pin nut.

The jack device 10 has a top frame 4d.
The tension rod 18 is passed through a CH-type jack (hollow jack) installed on the upper side, and the reaction force nuts 24 installed on the ram chair 23 and on the jack are alternately rearranged to perform jack down. The lower part of the tension rod 18 is connected to the left and right ends of the suspension pin 11 via the clevis 16, and the tension rod 18 is connected to the upper part of the pier 1 to be removed, and (Play road jack up).

As shown in FIG. 6, the lowermost portion of the pier 1 is cut by a wire saw, and after cutting, the pier 1 is cut off by a jack-up. Then, a carrier 7 is set and the jack-down is performed.
(Step)

As shown in FIG. 10, core borings 19 and 20 for the wire through hole and the reinforcing bar cutting hole are performed in advance, and a diamond wire saw 21 is inserted into the core boring 19 as shown in FIG. Further, a pulley 22 is attached to the bridge pier 1 as a skeleton, and the diamond wire saw 21 is wound around the cut surface and cut.

As another embodiment, as shown in FIG. 10, a straight line portion may be cut by a tapered rod 25 instead of the diamond wire saw 21. In the figure, reference numeral 26 denotes a CH-type jack for pulling the tapered rod 25.

In this way, the lower part of the pier 1 is cut into blocks as shown in FIG. 7 (step).
As shown in (1), the pier 1 is jacked up, and the removed lump on the transport trolley 7 is moved to the crane suspension position (step).

As shown in FIG. 9, the pier 1 is jacked down (step), and thereafter, the steps are repeated. After a few down, the suspension pins 11 are changed to the upper row.

In this manner, the dismantling is progressed by repeating the lowering of the pier 1, which is the portion to be removed by the jack device 10, the cutting of the lower block, and the removal of the removed mass.

The pressure of the jack device 10 when the pier 1 is lowered and the measurement for monitoring the posture of the pier 1 are performed. To realize this, the jack device 10 prevents the pier 1 from tipping over. Operate while controlling load / displacement using a quadruple different load pump that operates (displacement can be tuned at different loads).

A pressure transducer is mounted on the hydraulic jack, and TON (digital) display is performed on the hydraulic pump to constantly manage the hanging load. In addition, a displacement meter is installed to measure the displacement of the immovable reference point (arbitrarily set at the site) and the pier. Further, an inclinometer is attached to the pier 1, and the inclination angles in the bridge axis direction and the bridge direct direction are constantly measured and managed.

The beam connecting the left and right piers 1 is installed in a state where the piers 1 are removed and the piers 1 are slightly lifted off the ground using a horse or the like to support the footing portion at the end. Perform the core boring of the wire through hole and the reinforcing bar cutting hole in the same way as in the part 1,
Cut into multiple blocks with a diamond wire saw and remove.

After the gate-shaped structure by one pier 1 is cut and removed in this way, the gantry is dismantled,
After removing the jack device 10, the top frame 4d, the mast frame 4c, the intermediate frame 4b, and the base frame 4a
In this order, the supporting gantry 4 is disassembled, the transport gantry 6 is disassembled, and then the pier 1 is replaced.

Further, the removed lump is suspended by a crane, transported to a small yard, divided into small pieces, loaded into a yard, and transported to an accumulation yard.

In the above embodiment, the case of dismantling and removing the pier 1 has been described. However, the present invention can be applied to all other structures having a pillar.

[0036]

As described above, the structure removal method of the present invention can reduce the curing equipment and safety equipment by performing the main demolition work in a low place near the ground, and can reduce the safety and construction of workers. In addition, the lifting machine can be constructed with a relatively small lifting machine, and there is no need to support the skeleton, which is inexpensive and rational.

[Brief description of the drawings]

FIG. 1 is a side view showing one embodiment of a structure removing method according to the present invention.

FIG. 2 is a front view showing one embodiment of the structure removing method of the present invention.

FIG. 3 is a perspective view showing one embodiment of the structure removing method of the present invention.

FIG. 4 is a front view of a first step of the structure removing method of the present invention.

FIG. 5 is a front view of a second step of the structure removing method of the present invention.

FIG. 6 is an explanatory view of a third step of the structure removing method of the present invention.

FIG. 7 is a side view of a fourth step of the structure removing method of the present invention.

FIG. 8 is a front view of a fifth step of the structure removing method of the present invention.

FIG. 9 is a front view of a sixth step in the structure removing method of the present invention.

FIG. 10 is a cross-sectional plan view of the cutting step of the structure removing method of the present invention.

FIG. 11 is a cross-sectional plan view of a cutting step showing another embodiment of the structure removing method of the present invention.

FIG. 12 is a cross-sectional plan view showing a state of cutting with a wire saw in the structure removing method of the present invention.

FIG. 13 is a longitudinal sectional front view showing an installation portion of a hanging pin in the structure removing method of the present invention.

FIG. 14 is a vertical sectional side view showing an installation portion of a hanging pin in the structure removing method of the present invention.

FIG. 15 is a work flowchart showing one embodiment of the structure removing method of the present invention.

FIG. 16 is a front view of a pier.

FIG. 17 is a side view of a pier.

FIG. 18 is an explanatory view of cutting and removing.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Bridge pier 2 ... Girder 3 ... Footing 4 ... Supporting stand 4a ... Base frame 4b ... Intermediate frame 4c ... Mast frame 4d ... Top frame 5 ... Guide roller 6 ... Carrier pedestal 7 ... Carrier trolley 8 ... Holding wire 9 ... Hanging Core 10 ... Jack device 11 ... Hanging pin 12 ... Shear tube 13 ... Non-shrink mortar 14 ... Reinforced iron plate 15 ... Chemical anchor 16 ... Clevis 17 ... Pin nut 18 ... Tension rod 19,20 ... Core boring 21 ... Diamond wire saw 22 ... pulley 23 ... ram chair 24 ... reaction force nut 25 ... taper rod 26 ... jack

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yasuo Hashimoto 1-315 Awaza, Nishi-ku, Osaka-shi, Osaka Kashima Construction Co., Ltd. Kansai Branch (72) Inventor Toshio Funako 1-3-Awaza, Nishi-ku, Osaka-shi, Osaka No.15 Kashima Construction Co., Ltd.Kansai Branch (72) Inventor Masahiro Kamio 1-315 Awaza, Nishi-ku, Osaka City, Osaka Prefecture Kashima Construction Co., Ltd.Kansai Branch (72) Inventor Masahiro Kuita, Aichi Awaza, Nishi-ku, Osaka City, Osaka No. 3-15 Kashima Construction Co., Ltd. Kansai Branch (56) References JP-A-7-102793 (JP, A) JP-A-6-272402 (JP, A) Jikken 39-12441 (JP, Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) E04G 23/08

Claims (3)

(57) [Claims] 1. A support base is assembled along a part where a structure is to be removed, a jack device is installed on an upper end of the support base, and a core bore is provided above the part to be removed.
And a sheath tube is provided in the core hole.
Fill the voids with non-shrink mortar and pressurize the core hole.
Hanging pin reinforced outside with iron plate and inserted into the core hole
Is connected to a tension rod, the tension rod is suspended and supported by the jack device, the lower portion of the portion to be removed is cut into a block shape, the removed lump is carried out, and thereafter, the removal is performed by the jack device. The removal method of the structure characterized by repeating the descent of the part, the block-shaped cutting, and the removal of the removed lump. 2. The structure according to claim 1, wherein a transport gantry extending in the horizontal direction is assembled on the rising support gantry, and the transport trolley is movably installed on the transport gantry, and the removed lump is transported by the transport trolley. Removal method. 3. A cutting is carried out prior to core boring of the wire through hole and rebar cutting holes, according to claim 1 or claim 2, wherein performing a wire saw cutting attach the diamond wire saw and pulleys precursor to the cleavage plane Removal of structures.