JPH09195228A - Build-up trestle for bridge pier reinforcing work and its using method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a build-up trestle to which carrying-in and carrying-out function of materials is added to a conventional scaffold so that the carrying-in and mounting of a steel plate can be performed without disassembling the frame once assembled in the middle as it is. SOLUTION: A monorail suspending beam 5 (5a) is mounted on the top part of a curved surface frame formed of steel pipe-made gate frames 1, a cross brace, and a cloth frame with plate, which is constructed around a bridge pier P having a substantially circular section, in the normal direction to the bridge pier surface so as to be slightly protruded on the bridge pier side, a monorail 6 is mounted on the lower surface of the protruded part while holding a substantially equal distance to the bridge pier surface, and a geared trolley having a chain block suspended therefrom is mounted on the monorail 6 in such a manner as to be capable of being suspended and traveling.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pedestal for use as a scaffold for carrying in materials during reinforcement work for improving the earthquake resistance of piers such as road bridges and railway bridges.

[0002]

2. Description of the Related Art Since the damage to highway bridges and railroad bridges was greater than expected in the January 1995 Hyogoken Nanbu Earthquake, it was an urgent task to review the seismic standards for RC structures. In the province, a railway facility seismic structure study committee has been established to summarize emergency reinforcement measures, and seismic reinforcement work will be carried out on existing viaducts with a rigid frame structure, abutments, and middle pillars of open-cut tunnels.

Examining the state of failure, the concrete part was crushed and dropped due to the impact during an earthquake, and the resistance on the compression side of the RC structure dropped sharply. It is desirable that the concrete has a structure that can maintain the state of being constrained around the reinforcing bars. Therefore, in the case of a pier, by sticking a steel plate to the outer peripheral surface of the pier so as to surround the concrete, this restrains the concrete on the inside, so that improvement in earthquake resistance can be expected.

An example of the construction procedure in this case is RC
After roughening the outer peripheral surface of the bridge pier, suspend the steel plates and apply them to the surroundings, weld the steel plates to each other and inject resin into the gap between the concrete and the steel plates to bond the steel plates to the outer peripheral surface of the pier, and finally The surface of the steel sheet is finished and painted. In such work on the surface portion of the pier, it is usual to install a steel pipe framework scaffold (hereinafter referred to as a framework), which is an assembly of steel pipe building frames, cross braces, cloth frames with plates, etc., around the piers. As an example of a building frame, the gate formwork 1 is shown in FIG.

However, in the above-described series of operations, if this framework is provided, it will hinder the suspension by the crane when the steel sheet is loaded in the intermediate stage. However, since it is necessary to carry the steel plates to almost fixed positions and then reassemble them, the work efficiency is poor because the frame is assembled and disassembled twice.

[0006]

DISCLOSURE OF THE INVENTION The present invention solves the above problems and allows a conventional steel pipe frame scaffold to be provided with a material so that a steel plate can be carried in and attached while the assembled frame remains as it is. The purpose is to realize a prefabricated stand for pier reinforcement work with loading / unloading functions.

[0007]

The present invention as set forth in claim 1 is an assembling type pedestal installed around a pier having a substantially circular cross section, after a slight distance is provided on the ground around the pier. The gate formwork is piled up to a specified number of steps on the upper part of the base jacks that are arranged at a predetermined interval in the approximately normal direction of the pier, and a cloth frame with a plate is spanned between the gate formwork, and on the side of the gate formwork. A curved wall frame constructed by attaching cross braces, and a monorail suspension that is mounted on the top of this frame approximately horizontally via the top jack and in the direction normal to the pier surface and slightly protruding to the pier side. The monorail is composed of a beam and a monorail attached to the lower surface of the protruding portion of the monorail suspension beam at a substantially equal distance from the pier surface. A bridge pier construction work for prefabricated platform, characterized in that attached to.

According to the second aspect of the present invention, the curved wall frame installed around the pier P is an opening without cross braces and a cloth frame with a plate for at least one span. The assembled pedestal for pier reinforcement work according to claim 1, wherein the monorail is arranged so as to be separated from the surface of the pier at the position. The present invention according to claim 3 has, on the side surface of the frame, a hinge mechanism that is substantially trapezoidal and is locked to the frame near both ends of one side, and connects the ends of the hanging chain near both ends of the opposite side. It is an assembling stand for pier reinforcement work according to claim 1 or 2, which is provided with a splash deck.

The present invention according to claim 4 is characterized in that a reinforcing steel plate is hung by a chain block, and a geared trolley is run along a monorail to hang it up to near the surface of a pier. It is a method of using the prefabricated mount for pier reinforcement work described in any of the above. Further, in the present invention according to claim 5, at the time of hoisting a steel plate for reinforcement by a chain block and running the geared trolley along the monorail to hang it near the surface of the pier, at least a part of the splash deck is temporarily stored. The method of using the prefabricated pier reinforced construction mount according to claim 3, wherein the reinforcing steel plate is hung through the portion.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below. In this embodiment, since the work of winding a steel plate around the outer peripheral surface of the pier P having a substantially circular cross section is performed, the pier P surrounding the pier P is first surrounded. It is necessary to construct a circular steel pipe framework scaffold. By the way, the Applicant has been studying frame scaffolds installed along such curved surfaces for a long time, and as part of that, since April 14, 1995, "frame scaffolds for curved wall" (special Japanese Patent Application No. 7-89256, hereinafter referred to as "prior invention"). Since it is extremely effective to use the framework of the prior invention in the present invention, it will be first outlined before the description of the embodiments.

FIG. 8 is a scaffold (framework) for this curved wall.
1 is a perspective view showing an embodiment, 1 is a portal form, 2a is a base jack to be inserted into the base thereof, 3 (3a, 3b) is the portal form 1
In the meantime, cross braces 4 (4a, 4b) attached at right angles to this are cloth frames with a plate spanned between the portal forms 1, S is a frame, and W is a wall. In the example of FIG. 8, the frame S is constructed on the outside of the wall W having a substantially circular cross section, but the cross brace 3 is for a curved wall with respect to the portal form 1 installed in the normal direction of the wall W. Far side 3a and near side 3b
And the overall length of the cloth frame 4 with a plate is different, and the plane shape of each of the long sides is parallel to each other, and the short side is opened in the direction away from the wall by the same angle from the direction perpendicular to the long side. In addition to having an isosceles trapezoidal plane shape that is inclined, the length 4a of the curved wall that is extended to the far side and the length 4b that is extended to the near side are different from each other.

With the above construction, the framework is constructed along the curved wall without increasing the number of components and without forming triangular openings everywhere, and the work can be performed safely. It can be carried out. Next, an embodiment of the prefabricated gantry for pier reinforcement work of the present invention will be described with reference to the drawings. FIG. 1 shows this prefabricated mount as XX in FIG.
FIG. 2 is a plan view of the front view, and FIG.
1 is a partial front view showing an enlarged part of FIG. 1, FIG. 4 is a partial plan view showing an enlarged part of FIG. 2, 1 is a gate form, and 2 is arranged above and below the gate form 1. A jack, 3 is a cross brace that connects the gate forms to each other, 4 is a cloth frame with a plate that is a scaffolding that is laid between the gate forms, 5 is a gate form 1, a cross brace 3, a cloth frame with a plate 4 A monorail suspension beam attached to the top of the frame S composed of, for example, 6 is a monorail traveling girder (hereinafter simply referred to as a monorail) attached to the lower surface of the monorail suspension beam 5, and 7 is a geared trolley that suspends the monorail 6. 8 is this geared trolley 7
Chain block suspended on the side, 9 is a flip-up flip deck attached to the side of the frame S, 10
Is a suspension chain that suspends and supports the tip of this splash deck, and P is a pier.

First, after a slight distance is provided on the ground around the pier P, the base jacks 2a are arranged at a predetermined interval in the normal direction of the pier P, and the gate formwork 1 is provided on the upper portion of the base jack 2a at an appropriate number of steps, that is, the bridge. It is piled up to the height necessary for the work of reinforcement work, the cloth frame 4 with a plate is passed between the gate formwork, and the cross brace 3 is attached to the side face of the gate formwork to construct the frame. As the cloth frame 4 with a plate and the cross brace 3, the one for the curved wall of the prior invention shown in FIG. 8 is used.

Since the portal form 1 is arranged in a substantially normal direction with a small working space left between it and the pier P, that is, at an appropriate distance, the portal form 1 is located at the top of the framework. 1
The monorail suspension beam 5a is attached to a position directly above the top via the top jack 2b. The upper and lower base jacks 2a and the top jack 2b finely adjust the unevenness (unevenness) of the construction surface and the level defect of the framework, and the cloth frame 4 with a plate and the monorail suspension beam 5a
Be as horizontal as possible.

The monorail suspension beam 5a is projected inward of the frame S, and the monorail 6 is attached to the lower surface of the projecting portion so as to keep an equal distance from the pier surface, that is, in a substantially circumferential shape. At this time, it is desirable that the vicinity of the end of the monorail suspension beam 5a on the side opposite to the protruding side be tightly bound with a steel wire or the like as shown by reference numeral F in FIG. Since the monorail 6 is a running girder for suspending a commercially available geared trolley 7, H-shaped steel, I-shaped steel or the like having a predetermined size is used. The geared trolley 7 travels in an arbitrary direction by pulling an attached travel chain. If a commercially available chain block 8 is also suspended from the geared trolley 7, the chain block 8 can be used to convey materials such as steel plates along the monorail 6, that is, along the surface of the pier P. it can.

As shown in FIG. 2, it is preferable that the cross brace 3 and the cloth frame 4 with a plate are not attached to at least one span (lower portion in FIG. 2) of the frame S, and the material is used as a material inlet. The monorail 6 circulates around the bridge pier P almost once, but is arranged so that it is separated from the surface of the pier at the above-mentioned material inlet portion, that is, it is inverted and does not run along the wall surface and goes outward. To do. Therefore, for this part, it is necessary to appropriately attach monorail suspension beams 5b and 5c that support the frame from both sides to the top of the frame.

As shown in FIG. 1, a flip-up deck 9 is appropriately attached to the inner side surface of the frame S to be used as a scaffold for work. As shown in FIG. 5, the flip-up deck 9 is provided with a hinge mechanism near one end of a trapezoidal deck plate and is locked to the gate formwork 1 by clamp metal fittings or the like, and ends of the hanging chain 10 near both ends of the opposite side. Connect and configure. FIG. 6 is a sectional view taken along the line YY of FIG. Around the flip-up deck 9, it is desirable to provide a handrail that can be removed appropriately.

By constructing the assembling type pedestal as described above, by using the cloth frame 4 with a plate and the splashing deck 9 which are spread over an appropriate height of the frame as a scaffold, the surface of the pier P is roughened, steel plates are welded, painting, etc. While performing the work, the steel plate is carried in from the outside by temporarily flipping up only the lifting deck 9 with the framework as it is, and is lifted by the chain block 8 to move the geared trolley 7 to a desired position, and the steel plate is attached to the pier P. It is possible to carry out the work of mounting in a predetermined position.

[0019]

According to the present invention, a frame scaffold is assembled with a small working space left around the pier, and a monorail, geared trolley, and chain block are attached to the space, so that when carrying in steel plates. In addition, it is not necessary to disassemble and reassemble the frame scaffold, and it has an excellent effect that the efficiency and safety of the pier reinforcement work are significantly improved.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing an assembly-type mount according to an embodiment of the present invention as seen from the direction of arrow XX in FIG.

FIG. 2 is a plan view of an assembly type pedestal showing an embodiment of the present invention.

3 is a partial front view showing a part of FIG. 1 in an enlarged manner. FIG.

FIG. 4 is a partial plan view showing a part of FIG. 2 in an enlarged manner.

FIG. 5 is a plan view showing the vicinity of the splash deck in the embodiment of the present invention.

6 is a cross-sectional view of the flip deck showing the YY cross section of FIG. 5;

FIG. 7 is a front view showing a portal form used in the present invention.

FIG. 8 is a perspective view showing a curved wall frame scaffold of the prior invention for use in the present invention.

[Explanation of symbols]

 1 portal form 2 jack 2a base jack 2b top jack 3 cross brace 4 cloth frame with board 5 monorail suspension beam 6 monorail 7 geared trolley 8 chain block 9 splash deck 10 suspension chain P pier S frame

Claims (5)

[Claims] 1. A prefabricated pedestal installed around a pier (P) having a substantially circular cross section, the pier (P) being provided at a predetermined interval after a certain distance is provided on the ground around the pier (P). The gate formwork (1) is piled up to a predetermined number of stages on the upper part of the base jack (2a) which is arranged in the substantially normal direction, and the cloth frame with plate (4) is laid between the gate formwork (1). , A frame for curved walls constructed by installing cross braces (3) on the side of the gate formwork (1), and approximately horizontal to the top of this frame via the top jacks (2b) and to the pier surface. A monorail suspension beam (5) mounted in the direction of the line and slightly projecting to the pier side, and a lower surface of the projecting portion of the monorail suspension beam (5) at a substantially equal distance from the surface of the pier (P). It consists of a monorail (6) that can be attached, and a chain is attached to this monorail (6). Pier reinforcement work for prefabricated platform, wherein a geared trolley with hanging block (8) and (7) mounted freely suspended travel. 2. The curved wall frame installed around the pier (P) is an opening without cross braces (3) and a plate-shaped cloth frame (4) for at least one span,
The prefabricated mount for pier reinforcement work according to claim 1, wherein the monorail (6) is arranged so as to be separated from the pier surface at the opening position. 3. The frame has a substantially trapezoidal side surface, and has a hinge mechanism near both ends of one side, which is locked to the frame, and ends of the hanging chain (10) are connected near both ends of the opposite side. The pedestal reinforcement work assembly type stand according to claim 1 or 2, further comprising a splash deck (9). 4. The pier reinforcement work according to claim 1, wherein a reinforcing steel plate is hung up by a chain block, and a geared trolley is run along a monorail to hang it up to near the pier surface. How to use the prefabricated mount. 5. When a steel plate for reinforcement is hoisted by a chain block and a geared trolley is run along a monorail to hang it near the surface of a pier, at least a part of the flip-up deck is temporarily stored and passed through that part. The method of using the prefabricated gantry for reinforcing pier according to claim 3, wherein a steel plate for reinforcement is suspended.