JP4884189B2 - Columnar structure reinforcement method - Google Patents

Description

The present invention is, for example, suitable for Retrofit of bridge legs standing on river, inexpensive and with a lightweight substantially flat reinforcing frame, small capacity reduction and cost reduction of the press-fitting device such facilities, as well as small and light The present invention relates to a method for reinforcing a columnar structure, which can reduce the work period and the construction cost by reducing the work period while reducing the work cost.

  For example, as a seismic reinforcement method for existing piers such as viaducts, a press-fitting device is fixed to a columnar structure such as a pier, and a plurality of steel plate blocks are applied to the peripheral surface of the columnar structure and assembled by connecting them with bolts. There is a reinforcement method in which the assembly block is pushed down by a press-fitting jack of the press-fitting device, and this is inserted into the ground so as to surround the periphery of the columnar structure (for example, see Patent Document 1).

  However, in the conventional reinforcement method, the steel plate block is expensive and large and heavy, and is assembled by connecting it with bolts. Therefore, it takes time to assemble and requires heavy equipment for this work. In addition, there is a problem that the hydraulic jack is increased in size and weight, the construction period is lengthened, and the construction cost is increased.

  In order to solve such a problem, a right angle steel sheet pile having a joint is inserted into the underground portion of the columnar structure using a hydraulic jack or a vibration device, and the joint is engaged with the adjacent position of the steel sheet pile to make a right angle steel sheet. There is a reinforcing method in which a sheet pile is inserted and a columnar structure is surrounded by a plurality of steel sheet piles without excavating the ground (see, for example, Patent Document 2).

  However, since this conventional reinforcing method uses right-angle steel sheet piles, there are restrictions on the cross-sectional shape of the columnar structure to be constructed, and right-angle steel sheet piles are generally expensive, large and heavy, and can be relatively reduced in construction costs. However, since a wide steel sheet pile is used, the weight is increased, and a medium to large-capacity hydraulic jack and a vibration device are required, resulting in a large work.

  On the other hand, as a seismic reinforcement method for columnar structures such as bridge piers standing in rivers, a press-fitting device is fixed to the columnar structure, and multiple steel plate blocks are applied to the peripheral surface of the columnar structure and connected with bolts. In addition, there is a reinforcing method in which a rubber packing is inserted in the joint portion and watertightly assembled, the assembly block is pushed down by a press-in jack of the press-fitting device, and this is inserted into the water bottom ground and watertightly tightened. (For example, refer to Patent Document 3).

  However, in the conventional reinforcement method, the steel plate block is expensive, large and heavy, and is connected with bolts, and a rubber packing is inserted into the joint portion so that it is assembled in a watertight manner. It takes time and labor, and when it is installed in rivers, it is difficult to make large-scale work by assembling on the bottom of the water using heavy machinery and stacking steel plate blocks in multiple stages. There was a problem such as swelling.

Japanese Patent No. 3249789 JP-A-2005-248613 Japanese Patent Laid-Open No. 2003-253665

The present invention solves this problem, for example, suitable Retrofit of bridge legs standing on river, inexpensive and with a lightweight substantially flat reinforcing frame, small capacity of facilities for the press-fitting device, etc. In addition to lowering the cost and reducing the size and weight, we provide column-structure reinforcement methods that can avoid work underwater, making the work safer and easier, as well as shortening the construction period and reducing construction costs. The purpose is to do.

According to the first aspect of the present invention, a plurality of plate-like reinforcing frames are connected to a periphery of a columnar structure through a joint so as to be slidable in the vertical direction, and the reinforcing frames are sequentially pushed down by a pressing device installed above the reinforcing structure. In the column structure reinforcing method in which the frame is press-fitted into the ground around the lower end portion of the columnar structure, a reaction force frame in which a pair of upper and lower reaction force frames are arranged on the peripheral surface of the columnar structure is installed, and the reaction force The lower part of the gantry is installed directly above the upper end of the reinforcing frame, the reinforcing frame is arranged in a substantially annular shape, spaced apart from the reaction force gantry, and the upper end of the reinforcing frame is placed on the lower reaction force frame. It can be placed above the ground and erected on the ground, and a pressing gantry equipped with a pressing device can be movably installed along the upper and lower reaction force frames, and the pressing gantry and the reaction force gantry can be restrained by a tension member. And when the reinforcement frame is pushed down, the pressing frame can be moved through the operation of the tension member. And bundles, after press-fitting of the reinforcing frame, and releases the braking of the pressing frame, the pressing frame moves upward the reinforcing frame adjacent, using inexpensive and lightweight plate-shaped reinforcing frame, also of the press-fitting device or the like of the equipment By reducing the capacity, reducing the cost, and reducing the size and weight, the work period can be shortened and the work cost can be reduced, and the reinforcement frame can be securely and efficiently inserted by the pressing device. The stand can be easily removed .

According to a second aspect of the invention, connecting one end of the tension member on either side of the pressing frame, connected to the reaction force frame of the lower positioned the other end of the tension member on either side of the reinforcing frame, the middle portion of the tension member Inserting a turnbuckle into the door, tightening or loosening the tension member through the operation of the turnbuckle, forming or releasing the restraint of the press cradle, easily tensioning or loosening the tension member, The reinforcement frame can be securely and safely press-fitted by restraining or releasing the reaction frame .
In the invention of claim 3 , the pressing device is moved downward along the pressing frame in stages, and after pressing the reinforcing frame by a predetermined amount, the pressing device is moved to the original position, and the reinforcing frame is press-fitted safely and comfortably. Trying to get .

According to a fifth aspect of the present invention, the reaction force frame is arranged in a substantially closed shape on a peripheral surface of the pier or the like, and the pressing frame can be moved in the circumferential direction of the pier or the like along the reaction force frame. The pressing device installed on the pressing frame is moved in the circumferential direction of the bridge pier, etc., so that the pressing operation for the plurality of reinforcing frames is realized.
The invention according to claim 6 is configured such that the reaction force frame is arranged away from the position of the reinforcement frame after the predetermined displacement is pushed down, so that the reaction force frame after the reinforcement frame is pushed down can be easily removed. ing.
According to a seventh aspect of the present invention, during the pressing operation of the pressing device, the movement of the pressing frame is restrained with respect to the reaction force frame, the movement of the pressing device is prevented, and the lowering of the reinforcing frame is safely and reliably performed. I can do it.
In the invention of claim 8, the reaction force frame is constructed on a peripheral surface such as a bridge pier above the water surface of the river so that the reaction force frame can be constructed easily and safely.

According to the first aspect of the present invention, a reaction force frame in which a pair of upper and lower reaction force frames are annularly arranged around a columnar structure is installed, and the lower part of the reaction force frame is installed immediately above the upper end of the reinforcement frame after construction. The reinforcing frame is arranged in a substantially annular shape so as to be separated from the reaction force frame, and the upper end of the reinforcing frame is arranged above the lower reaction frame so as to stand on the ground. A pressing gantry provided with a pressing device is movably installed along the reaction force frame, the pressing gantry and the reaction force gantry are connected so as to be restrained by a tension member, and the tension member is operated when the reinforcement frame is pushed down. Since the movement of the pressing frame is constrained via the reinforcement frame, and the reinforcement frame is press-fitted, the restriction of the pressing frame is released, and the pressing frame is moved above the adjacent reinforcement frame, so an inexpensive and lightweight plate-shaped reinforcement frame is used. In addition, it is possible to reduce the construction period by reducing the capacity and cost of the equipment such as the press-fitting device and reducing the size and weight. And decreases with attained the construction costs, it performed reliably and be efficiently press-fitting of the reinforcing frame by pressing device, after construction of the reinforcing frame, the removal of the reaction force frame can be easily performed.

According to a second aspect of the invention, connecting one end of the tension member on either side of the pressing frame, connected to the reaction force frame of the lower positioned the other end of the tension member on either side of the reinforcing frame, the middle portion of the tension member Since the turnbuckle is inserted into the tension buckle, the tension member is tensioned or loosened through the operation of the turnbuckle to form or release the restraint of the press cradle. constraining or releasing the reaction force frame, can it to reliably and securely pressed into the reinforcing frame.
In the invention of claim 3, since the pressing device is moved downward along the pressing frame in steps and the reinforcing frame is press-fitted by a predetermined amount, the pressing device is moved to the original position, so that the reinforcing frame is press-fitted safely without difficulty. It can be Rukoto.

In the invention of claim 5, the reaction force frame is arranged in a substantially closed shape on the peripheral surface of the pier, etc., and the pressing frame can be moved in the circumferential direction of the pier along the reaction force frame. The pressing device installed on the gantry can be moved in the circumferential direction of the bridge pier, etc., and the pressing down operation for the plurality of reinforcing frames can be realized.
According to the sixth aspect of the present invention, since the reaction force frame is disposed apart from the position of the reinforcement frame after the predetermined displacement is pushed down, the reaction force frame after the reinforcement frame is pushed down can be easily removed.
According to the seventh aspect of the present invention, since the movement of the pressing gantry is restrained with respect to the reaction force gantry at the time of the pressing operation of the pressing device, the movement of the pressing device is prevented and the pushing down of the reinforcing frame is performed safely and reliably. Can do.
In the invention according to claim 8, since the reaction force frame is installed on a peripheral surface such as a bridge pier above the water surface of the river, the reaction force frame can be installed easily and safely.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will now be given of an illustrated embodiment in which the present invention is applied to seismic reinforcement of a pier standing on a river. In FIGS. 1 to 16, reference numeral 1 denotes a columnar structure made of reinforced concrete, standing on a river 2. The lower end of the column pier is erected on a footing 4 laid inside the river bed 3 which is the ground, and the floor slab 5 is installed on the upper end.

A part of the pier 1 is submerged in the lower surface of the pier 1 so that the reinforcing frame 6 is surrounded and filled with a filling member 7 such as a concrete between the reinforcing frame 6 and the pier 1. Yes.
In the case of the embodiment, the reinforcing frame 6 is formed of a plurality of vertically long substantially flat plate plates, that is, flat plate plates or gently curved straight steel sheet piles, and joints 8 and 8 having substantially U-shaped cross sections at both ends of the steel sheet piles. It is provided and the adjacent reinforcement frames 6 can be slidably connected through the engagement of the joints 8 and 8.

When constructing the reinforcing frame 6 on the lower peripheral surface of the pier 1, first, a reaction force frame 9 is installed on the upper peripheral surface of the pier 1 above the water surface so that a pressing device described later can be installed.
The reaction force frame 9 has a plurality of reaction force frames 10 arranged in a substantially annular shape on the peripheral surface of the bridge pier 1 and arranged so as to be separated from each other in the vertical direction, and the height of the lower reaction force frame 10 is set as follows. It arrange | positions just above the upper end part of the reinforcement frame 6 after press-fit.
In the case of the embodiment, the reaction force frame 10 is made of H-shaped steel, which is curved and formed in the same shape as the peripheral surface of the pier 1, and the six reaction force frames 10 thus formed are closed on the peripheral surface of the pier 1. Or arranged in a ring

  Then, one web 10a of the formed reaction force frame 10 is arranged apart from the peripheral surface of the pier 1, the ends of the adjacent reaction force frames 10 are fastened with bolts and nuts 11, and the web 10a. The inner surface of the bridge is pressed against the peripheral surface of the pier 1.

A connecting piece 12 protrudes from the central part or both ends of the reaction force frame 10 in the up and down position, and a connecting frame 13 is connected to the pair of upper and lower connecting pieces 12 by bolts and nuts 14. .
In the embodiment, the connecting frame 13 uses L-shaped steel, and both ends of the upright side web 13 a are fastened with bolts and nuts 14, and a plurality of webs 13 b are brought into close contact with the peripheral surface of the pier 1. The anchor bolts 15 are arranged, and the bolts 15 are screwed into the peripheral surface of the pier 1 to fix the connecting frame 13.

A pressing frame 16 is movably installed in the circumferential direction of the pier 1 along the pair of upper and lower reaction force frames 10, and the pressing frame 16 has a pair of left and right step rails 17. Support frames 18 and 19 project from the upper and lower ends of 17.
Among these, the guide roller 20 is rotatably supported by the upper support frame 18, and the guide roller 21 is rotatably supported by the lower pair of support frames 19. -The la 20 and 21 are accommodated in the web 10b of the reaction force frame 10 in the vertical position so as to be able to run.

  In this case, in the embodiment, the single pressing frame 16 is installed on the reaction force frame 10, but it is also possible to install a plurality of them, so that the press-in of the reinforcing frame 6 described later can be performed quickly and efficiently. I can do it well.

A plurality of pin holes 22 are formed in the step rail 17, and a pin 23 is detachably inserted into the hole 22, and a mounting position of a press-fit jack 24, which is a pressing device that makes full use of hydraulic pressure through the pin 23. Can be changed.
The press-fit jack 24 includes a piston rod 25 that can be expanded and contracted, and a connecting piece 26 is attached to the tip of the piston rod 25. A diaphragm 27 is attached to the connecting piece 26, and a vibration motor 28 as a vibration device is installed on the diaphragm 27.

An upper portion of the chuck arm 36 is connected to both sides of the lower end portion of the diaphragm 27, and a chuck 29 having a substantially U-shaped cross section is attached to the inner side of the lower end portion of the arm 36.
The chuck 29 can be engaged with the upper end portion of the reinforcing frame 6, and the reinforcing frame 6 can be pushed down through its pressing displacement.

  In the figure, 30 is an electric winch which is a lifting machine installed at the upper end of the support frame 18 and is driven after a predetermined displacement press-fitting and wound around a hoisting drum (not shown). Via a wire (not shown), the diaphragm 28 integrated with the press-fit jack 24 and the vibration device 28 are lifted together, and can be moved to a predetermined press-fit start height position.

Disposed la 31,該Ro - - the lateral movement B on both sides of the winch 30 traverse les la 31 is laid continuously over the reaction force frame 10 of the upper - is drivable accommodated Le 3 9 .
Reference numeral 32 denotes a tension member such as a steel rod having one end fixed to the upper part of the step rails 17 and 17 and the other end connected to a predetermined position of the lower reaction force frame 10, and a turn buckle 33 is provided at an intermediate portion thereof. The turn buckle 33 is operated when the reinforcing frame 6 is press-fitted, and the tension member 32 is tensioned to prevent the movement of the pressing base 16.

  In addition, in the figure, 34 is a guide plate protruding from the center of the lower end portion of the pressing base 16, and its inner surface is disposed so as to be engageable with the outer surface of the web 10b, and an engagement plate 35 is provided on the inner surface. The guide roller 21 is disposed in close proximity to the lower surface of the lower reaction force frame 10 so as to prevent the position of the guide roller 21 from being displaced.

In the figure, reference numeral 37 denotes a roller bracket connected to the piston rod 25 so as to be movable. A lift prevention roller 38 is rotatably provided on both sides of the bracket 37 and can be engaged with the diaphragm 27. Is arranged.
That is, the rollers 38 and 38 are engaged with the vibration plate 27 to prevent the displacement of the vibration plate 27 when the reinforcing frame 6 is press-fitted (forward displacement) and the same displacement of the chuck arm 36. Thus, the chucks 29 and 29 are securely engaged with the reinforcing frame 6 so that the pressing force of the chuck 29 can be reliably and stably transmitted to the reinforcing frame 6.

When the bridge pier 1 standing on the river 2 is subjected to earthquake-proof reinforcement by a reinforcing method such as a bridge pier constructed as described above, a working scaffold (not shown) is installed around the pier 1 to be constructed.
The scaffold is erected from the river bed 3 and has a height sufficient to install the reaction force frame 9.
Next, the reaction force platform 9 is installed at a predetermined position on the peripheral surface of the pier 1, that is, above the water surface of the river 2 and above the construction height of the reinforcing frame 6 using the scaffold.

When the reaction force frame 9 is installed, a plurality of H-shaped steel reaction force frames 10 are used as the installation frame, and these are formed in advance in the same shape as the peripheral surface of the pier 1.
In the embodiment, since the pier 1 has a circular cross section, the pier 1 is curved to have a similar curvature, and is placed in the circumferential direction of the pier 1 by a heavy machine (not shown) installed at the construction site. The ends of the two are fastened with bolts and nuts 11, and the inner surface of the reaction force frame 10 is pressed into contact with the peripheral surface of the pier 1 to be closely attached.

In this way, the plurality of reaction force frames 10 are assembled in an annular shape, and the plurality of reaction force frames 10 are assembled in an annular manner in the same manner as above and below, and the coupling frame 13 is connected to the connecting pieces 12, 12 arranged in opposition to the bolts and nuts 14 Connect with
In the case of the embodiment as the connecting piece 12, L-shaped steel is used, both ends of the web 13 a on the upright side are fastened with bolts and nuts 14, and a plurality of anchors are attached to the web 13 b that is in close contact with the peripheral surface of the pier 1 Bolts 15 are arranged, and the bolts 15 are screwed into the peripheral surface of the pier 1 to fix the connecting frame 13.

Next, the pressing frame 16 is movably installed on the installed reaction force frame 9 along the pair of upper and lower reaction force frames 10.
When the pressing frame 16 is installed, a pair of step rails 17 constituting the frame 16, support frames 18 and 19 provided on the upper and lower ends thereof, and the support frames 18 and 19 are rotated. The guide rollers 20 and 21 that are freely supported, the guide plate 34 and the engaging plate 35 disposed at the lower end of the rail 17 are assembled in advance.

  Then, the assembly of the pressing gantry 16 is suspended on the peripheral surface of the reaction force gantry 9 by using the heavy machinery, and the guide rollers 20 and 21 are engaged on the web 10b of the reaction force frame 10 in the vertical position. Install and attach the guide plate 34 and the engagement plate 35 to the lower reaction force frame 10 so as to be engageable with each other.

  After the assembly of the pressing gantry 16 is attached, the press-fit jack 24, the diaphragm 27, and the hydraulic motor 28 are attached to the gantry 16. In this case, a connecting piece 26 is connected to the tip of the piston rod 25 of the press-fit jack 24 in advance, a diaphragm 27 is connected to the connecting piece 26, and a hydraulic motor 28 is attached to the diaphragm 27.

Then, the assembly of the press-fitting device is suspended from the peripheral surface of the press gantry 16 using the heavy machinery, the upper end of the press-fitting jack 24 is positioned in the upper pin hole 22, and the pin 23 is inserted into the press-fitting jack. 24 is fixed to the step rail 17, and the diaphragm 27 and the hydraulic motor 28 are suspended.
Further, the winch 30 and its winding drum (not shown) are installed on the upper support frame 18, and the laterally moving rollers 31 disposed on both sides of the winch 30 are installed on the upper reaction force frame 10. lateral movement Les - travels can housed Le 3 9.

Thereafter, both ends of the tension member 32 are connected to the upper portions of the step rails 17 and 17 and predetermined positions of the lower reaction force frame 10, and the turn buckle 33 is attached to the intermediate portion thereof.
In this way, a series of installation work of the reaction force frame 9 and the pressure frame 16 is completed. This situation is as shown in FIG.
In this case, the pressing base 16 can be moved to the press-fitting start position of the reinforcing frame 6, the turn buckle 33 can be tensioned to prevent the reinforcing frame 6 from moving when connected, and the position can be fixed. desirable.

After the reaction force frame 9 and the pressure frame 16 are installed in this way, the reinforcing frames 6 are transported to the construction site, and each of the frames is suspended using the heavy machinery, and this is suspended around the installed upper and lower reaction force frames 10. Positioned apart from the outside of the surface, part of it is immersed in the river 2 and stands on the river bed 3.
At this time, the reinforcing frame 6 erected is held on the peripheral surface of the reaction force frame 10 by appropriate means.

Next, another reinforcing frame 6 is suspended by a heavy machine, positioned at a position adjacent to the reinforcing frame 6, and a part of the reinforcing frame 6 is immersed in the river 2 and is erected on the river bed 3.
At that time, the joint 8 of the reinforcing frame 6 is engaged with the joint 8 of the reinforcing frame 6 erected, and the reinforcing frames 6 are connected to each other.

Thereafter, the reinforcement frame 6 is sequentially suspended by heavy machinery, and this is positioned at a position adjacent to the preceding reinforcement frame 6, and a part of the reinforcement frame 6 is immersed in the river 2 and is erected on the river bed 3. Engage and connect adjacent reinforcement frames 6 together.
In this way, the plurality of reinforcing frames 6 are arranged in an annular shape over the river bed 3 outside the peripheral surface of the reaction force frame 10 below the reaction force frame 9. This situation is as shown in FIGS.

Under such circumstances, the pressing base 16 is moved to the press-fitting start position of the reinforcing frame 6, the turn buckle 33 is tensioned to fix the pressing base 16 to the reaction force base 9, and the reinforcing frame 6 is press-fitted. Prevent movement in time.
In the embodiment, as described above, when the reinforcing frame 6 is connected, the pressing frame 16 is fixed to the press-fitting start position of the reinforcing frame 6 with respect to the reaction force frame 9, and the pin 23 is disposed on the upper side of the step rail 17. The press-fit jack 24 is fixed, and a chuck 29 provided at the lower end of the diaphragm 27 is positioned immediately above the upper end portion of the reinforcing frame 6.

Under such circumstances, the press-fitting jack 24 is extended and the piston rod 25 is extended downward, and the vibration motor 28 is driven to vibrate the diaphragm 27.
If it does in this way, the diaphragm 27 will move below, the chuck arm 36 will move to this, and the chuck | zipper 29,29 will engage with the upper end part of the reinforcement frame 6, and will push this downward.

For this reason, the reinforcing frame 6 is pushed down and the lower end thereof is press-fitted into the river bed 3. At that time, the reinforcing frame 6 is moved along with the vibration of the diaphragm 27 and is quickly and smoothly press-fitted into the river bed 3.
When such a reinforcing frame 6 is press-fitted, the lift prevention roller 38 is engaged with the diaphragm 27 to prevent the diaphragm 27 from being lifted (forward-inclined) and similarly to the chuck arm 36. To prevent excessive displacement.
For this reason, the chucks 29, 29 are reliably engaged with the upper end portion of the reinforcing frame 6, and the pressing force is reliably and stably transmitted to the reinforcing frame 6.

Further, since the reinforcing frame 6 is held by the joint 8 of the adjacent reinforcing frame 6 and slides along the joint 8, the reinforcing frame 6 moves stably in a substantially vertical manner and prevents deformation and buckling during press-fitting. To do.
If the riverbed 3 is rock or rocks are expected to appear, they can be crushed or removed with a back fork before press-fit, or a jet mechanism is attached to the lower end of the reinforcement frame 6 Then, it is possible to press-fit while crushing the bedrock.

Thus, the press-in jack 24 is further extended, the piston rod 25 is fully stroked, and the reinforcing frame 6 is press-fitted into the river bed 3. This situation is as shown in FIGS. 9 and 10. Thereafter, one end of a wire (not shown) wound around a hoisting drum (not shown) of the winch 30 is connected to the upper end of the press-fit jack 24, and the jack 24 When the diaphragm 27, the vibration motor 28 and the like can be held together, the pin 23 is pulled out from the pin hole 22, the fixed state of the press-in jack 24 is released, and the press-in jack 24 is reduced.

  Then, the wire of the winch 30 is rolled back, the press-fit jack 24 is moved downward by the stroke, the pin 23 is inserted into the lower pin hole 22 at the moved position, and the press-fit jack 24 with respect to the step rail 17 is inserted. Move the fixed position of. This situation is as shown in FIG.

Thereafter, the extension operation of the press-in jack 24 is resumed, the piston rod 25 is extended downward, the vibration motor 28 is driven to vibrate the diaphragm 27, and the reinforcement frame 6 is press-fitted into the river bed 3.
When the press-in jack 24 is fully stroked and the reinforcing frame 6 is press-fitted into the river bed 3, the pin 23 is pulled out and the press-in jack 24 is contracted to move the fixing position with respect to the step rail 17 downward. Change. This situation is as shown in FIG.

Thereafter, the fixing position of the press-in jack 24 is sequentially shifted downward, the jack 24 is fully stroked and the reinforcing frame 6 is gradually press-fitted into the river bed 3, and the lower end thereof is the upper end of the footing 4. Is reached, the extension operation of the press-fit jack 24 is stopped, and the press-fit of the reinforcing frame 6 is finished.
This situation is as shown in FIG. 13, and the upper end portion of the reinforcing frame 6 is located immediately below the lower reaction force frame 10.

Thereafter, the pin 23 is pulled out and the press-fit jack 24 is contracted to release the fixed state with respect to the step rail 17.
Then, the winch 30 is driven to wind up the wire, the press-in jack 24, the diaphragm 27, the vibration motor 28, etc. are pulled up together, and when these are moved to the original position of the press-in of the reinforcing frame 6, The loose buckles 33 and 33 are loosened, the fixed state of the pressing frame 16 and the reaction force frame 10 is released, and the pressing frame 16 is pushed and moved in the lateral direction.

In this way, the guide rollers 20 and 21 travel along the web 10b of the upper and lower reaction force frames 10, and the lateral movement roller 31 travels along the lateral movement rail 36. Moves laterally and stops when it moves to the center position of the adjacent reinforcing frame 6.
Then, it was transferred to a fixed position of the tension member 3 2 lower, the motor - Nbakkuru 33 tension operation to fix the pressing frame 16 in a counter-force frame 10 of the lower side.

Thereafter, the press-fit jack 24 is fixed to the upper side of the step rail 17 via the pin 23, the chuck 29 is positioned immediately above the upper end portion of the reinforcing frame 6, and the press-fit jack 24 is extended.
In the same manner as described above, the piston rod 25 is extended downward, the vibration motor 28 is driven to vibrate the vibration plate 27, and the chuck 29 is moved to engage the upper end portion of the reinforcing frame 6. Then, this is pressed downward, and the lower end thereof is press-fitted into the river bed 3.

  Thereafter, the press-fit jack 24 is fully stroked and the reinforcement frame 6 is press-fitted into the river bed 3, and then the press-fit jack 24, the diaphragm 27, the vibration motor 28, etc. are connected via the wire linked to the winch 30. When the holding together is possible, the pin 23 is pulled out, the fixed state of the press-in jack 24 is once released, and the press-in jack 24 is contracted.

Then, the press-fit jack 24 is moved downward by the stroke through the winch 30, and the pin 23 is inserted into the lower pin hole 22 at the moving position to fix the press-fit jack 24 to the step rail 17. Change position.
Thereafter, the extension operation of the press-in jack 24 is resumed, the piston rod 25 is extended downward, the vibration motor 28 is driven to vibrate the diaphragm 27, and the reinforcement frame 6 is press-fitted into the river bed 3.

  Thereafter, the fixing position of the press-in jack 24 is sequentially shifted downward, the jack 24 is fully stroked and the reinforcing frame 6 is gradually press-fitted into the river bed 3, and the lower end thereof is the upper end of the footing 4. Is reached, the extension operation of the press-fit jack 24 is stopped, and the press-fit of the reinforcing frame 6 is finished.

  Then, the pin 23 is pulled out and the press-in jack 24 is contracted to release the fixed state with respect to the step rail 17, and the winch 30 is driven to move the press-in jack 24, the diaphragm 27, the vibration motor 28, etc. Pull them together and move them to the original position where the reinforcement frame 6 was pressed

  Thereafter, the turnbuckles 33, 33 are loosened, the fixed state of the pressing frame 16 and the reaction force frame 10 is released, the pressing frame 16 is pushed and moved laterally, and the frame 16 is moved to the center position of the adjacent reinforcing frame 6. Stop at the point where it moved to and press-fit the reinforcement frame 6 immediately below it into the river bed 3 as described above.

Thereafter, the reinforcing frame 6 is sequentially press-fitted into the riverbed 3, and after the press-fitting, the press-in jack 24 is raised to the original position, the pressing base 16 is moved to the position of the reinforcing frame 6 as the next construction position, and the reinforcing frame 6 is pressed into the press-in jack. 24 and press in stepwise, and the lower end thereof is set on the footing 4.
This state is as shown in FIGS. 14 to 16, and these show the state during the construction, and the lower reaction force frame 10 is located immediately above the upper end of the press-fitted reinforcement frame 6.

In this way, after the pressing pedestal 16 makes one turn along the peripheral surface of the pier 1 and all the reinforcing frames 6 are press-fitted, the pressing pedestal 16 and the reaction force pedestal 9 are sequentially removed using heavy equipment.
In this case, since the press-fitted reinforcement frame 6, the reaction force frame 9 and the pressing frame 16 are spaced apart from each other as described above, the pressing frame 16 and the reaction force frame 9 can be easily and safely removed. Moreover, since the press-in jack 24 and the winch 30 are small in capacity and small in weight, the removal work can be easily performed. FIG. 1 shows the situation after the removal.

After the removal, an empty space is formed between the press-fitted annular reinforcing frame 6 and the peripheral surface of the pier 1, and the space is filled with a filling member 7 such as a concrete. Reinforce.
And if the working scaffold of the surrounding surface of the pier 1 is removed after hardening of the filling member 7, a series of reinforcement construction will be complete | finished.

Thus, the construction method of the present invention uses a light and inexpensive substantially flat steel sheet pile as the reinforcing frame 6 and arranges it in an annular shape, so that the press-in jack 24 and the vibration mode used for the press-in are provided. Can reduce the capacity, cost, and size of the winch 30 and the winch 30, and facilitate construction.
In addition, a plurality of reinforcing frames 6 are annularly arranged on the peripheral surface of the pier 1 and the reinforcing frames 6 are individually moved and arranged by means of press fitting or the like in the construction part. This makes it possible to reduce the size and weight of the product, reduce the size and weight, and facilitate construction.

In the construction method of the present invention, the reaction force base 9 is installed on the peripheral surface of the pier 1, the pressing base 16 is moved along the peripheral surface of the pier 1 to the base 9, and the reinforcing frame 6 is individually applied to the construction part. Since it is moved by means such as press fitting, it is suitable for the reinforcement method of the pier 1 in rivers and the like where construction by heavy machinery is difficult.
In addition, since the devices such as the press-in jack 24 installed on the pressing base 16 are operated stepwise and the reinforcing frame 6 is moved stepwise and placed in the construction section, the capacity of the device such as the press-in jack 24 is reduced. It is possible to reduce the cost and size and weight.

  Further, since the reinforcing frame 6 is annularly arranged outside the reaction force frame 9 and the pressing frame 16 is disposed apart from the press-fitted reinforcement frame 6, the annular arrangement of the reinforcing frame 6 is made using the pressing frame 16. In addition, the press frame 16 and the reaction force frame 9 can be removed and removed easily and rationally after the reinforcement frame 6 is press-fitted.

On the other hand, the pier 1 thus reinforced has its outer peripheral surface covered with a reinforcing frame 6 and is filled with a filler 7 such as a concrete between the pier 1 and the reinforcing frame 6. Can strengthen.
Further, since the filler 7 is formed with a thickness corresponding to the width of the reaction force base 9, the strength of the pier 1 can be improved.

  In addition, when the leg length of the pier 1 is long and the above-described reinforcement method is applied to the peripheral surface thereof, the above-mentioned reinforcement method is applied at the lowest position, and the filling member 7 is not filled in the construction portion. Then, the reaction force frame 9 and the pressure frame 16 are removed, and the reinforcing frames 6 are annularly stacked on the constructed reinforcing frame 6 using a heavy machine, and the filling member 7 is temporarily placed in these empty spaces. If filled, it can be constructed reasonably and inexpensively using the existing scaffold.

The columnar structure reinforcement method of the present invention uses an inexpensive and light, substantially flat reinforcing frame to reduce the capacity and cost of the equipment such as the press-fitting device, and to reduce the size and weight. to avoid work, ease of construction and work safety, as well as from attained to reduce the shortening of the construction period and construction cost, it is suitable for Retrofit of bridge legs erected, for example rivers.

It is sectional drawing which shows the condition after construction which shows embodiment which applied this invention to the earthquake-proof reinforcement of the bridge pier standing in the river. It is sectional drawing which follows the AA line of FIG. It is a front view which shows the construction situation of the earthquake-proof reinforcement of the said pier, The reaction force frame is constructed in the predetermined position surrounding surface of a bridge pier, and the pressure frame is installed in this frame.

It is the front view which expands and shows the principal part of FIG. 3, and has shown the installation condition of the reaction force stand and the press stand. It is a front view which expands and shows the installation condition of the reaction force stand and press stand used for this invention. It is sectional drawing which follows the BB line of FIG.

It is a front view showing the construction status of the seismic reinforcement of the bridge pier, and after installing a reaction force frame on the circumferential surface at a predetermined position of the bridge pier, connect a reinforcement frame in an annular shape to the outside of the frame, and stand this on the river bed It shows the status of placement. It is sectional drawing which follows the CC line of FIG. 7, and has shown the arrangement | positioning condition of a reaction force stand and a reinforcement frame. It is a front view which shows the construction situation of the earthquake-proof reinforcement of the said pier, and has shown the condition in the middle of press-fitting one of the reinforcement frames arrange | positioned on the surrounding surface of the pier to the river bed by operating the press-fit jack.

It is the front view which expands and shows the principal part of FIG. 9, and has shown the condition which act | operates a press-fit jack and press-fits the reinforcement frame. It is the front view which expands and shows the operation | movement condition of a press-fit jack, and shows the situation where the press-fit jack contracted and moved to the lower position after full stroke extension operation. It is a front view which expands and shows the operation | movement condition of a press-fit jack, and has shown the situation which is operating full stroke extension after moving a press-fit jack to a lower position.

It is a front view which shows the construction situation of the seismic reinforcement of the said pier, and shows the situation immediately after pressing one of the reinforcement frames arrange | positioned on the surrounding surface of a pier into the riverbed by operating the press-fit jack. It is a front view which shows the construction situation of the seismic reinforcement of the said pier, and shows the situation just before moving a press stand along a reaction force frame after pressing the reinforcement frame arrange | positioned on the surrounding surface of a pier into a riverbed. It is the front view which expands and shows a part of FIG. 14, and has shown the condition just before moving a press stand along a reaction force frame.

It is a front view which shows the construction situation of the seismic reinforcement of the said pier, and has shown the condition which pressed in half the reinforcement frame arrange | positioned on the surrounding surface of the pier to the riverbed.

Explanation of symbols

1 Pier 2 River 3 River bed 6 Reinforcement frame (steel sheet pile)
7 Filling Material 9 Reaction Force Base 10 Reaction Force Frame 16 Pressing Base 24 Pressing Device (Press-fit Jack)
27 Diaphragm 29 Chuck

Claims (3)

A plurality of plate-like reinforcing frames are connected to the periphery of the columnar structure via a joint so as to be slidable up and down, and the reinforcing frames are sequentially pushed down by a pressing device installed above, and the reinforcing frame is lowered to the lower end of the columnar structure. In the method of reinforcing a columnar structure that is press-fitted into the ground around the part, a reaction force frame in which a pair of upper and lower reaction force frames are arranged around the columnar structure, and the lower part of the reaction force frame is installed with the reinforcement frame Installed directly above the upper end of the rear, spaced apart to the outside of the reaction force frame, the reinforcing frame is disposed in a substantially annular shape, and the upper end of the reinforcing frame is disposed above the lower reaction force frame, The press frame provided with a pressing device is movably installed along the upper and lower reaction force frames, and the press frame and the reaction force frame are connected so as to be restrained by a tension member. At the time of pressing down, the movement of the pressing base is restrained through the operation of the tension member, and the pressure of the reinforcing frame is After releasing the restraint of the press frame, the reinforcing method of the columnar structure, characterized in that to move the pressing frame above the reinforcing frame adjacent. One end of the tension member is connected to both sides of the pressing frame, the other end of the tension member is connected to the lower reaction force frame located on both sides of the reinforcing frame, and a turnbuckle is inserted in the middle part of the tension member, 2. The columnar structure reinforcing method according to claim 1 , wherein a tension member is tensioned or relaxed through operation of the turnbuckle to form or release the restraint of the pressing frame . 2. The columnar structure reinforcing method according to claim 1 , wherein the pressing device is moved downward along the pressing frame in a stepwise manner, and the pressing device is moved to the original position after press-fitting a predetermined amount of the reinforcing frame .

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