JP3368483B2 - Bridge pier construction method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a pier having a height. 2. Description of the Related Art At present, the highest pier construction work in Japan is the one with a pier height of about 70 m, but in the future, the construction of mountain bridges will be started in accordance with the construction of the Second Higashi Meishin and crossing roads. It is expected that the number of cases will increase, and the construction of a tall pier exceeding a pier height of 100 m is also considered. 2. Description of the Related Art Conventionally, a column cap on a high pier is generally constructed by mounting a pier to a predetermined height, mounting a large steel bracket support on the side of the pier, and using the same. After the construction of the column capital is completed, the bracket support will be dismantled and the superstructure traveler (construction work vehicle) will be assembled on the bridge surface. The cargo handling equipment used to carry in the materials, such as tower crane,
Chlorine or the like is used. [0003] The above prior art includes the following:
The following problems exist. <B> The installation and dismantling of the large-sized bracket support is a work at height and a dangerous work. In particular, the demolition work is a work that has been carried out after the skeleton has been constructed above the shoring work, and is a very dangerous work. <B> The construction of the capital and the assembling of the traveler on the bracket support are also work at height and dangerous work. <C> The use of tower crane and the like is restricted by the wind speed, so that the operating rate may decrease. SUMMARY OF THE INVENTION [0004] The present invention has been made to solve the above problems, and reduces work at a high place,
An object of the present invention is to provide a bridge pier construction method capable of improving work safety and construction efficiency. [0005] That is, according to the present invention, a column cap as a superstructure of a pier is manufactured on the ground, and a guide column is set up from the lower end of the pier in the column cap, and a side surface of the guide column is formed. A step of equipping the column head with an engaging beam that engages with the lifting device, operating the lifting device to raise the column head to a predetermined height along the guide column, and fixing the same. A step of building a pier skeleton in a space generated below the column capital due to the ascent and a step of elevating and fixing the guide column while operating the elevating device to take a reaction force on the column capital, repeatedly performing, This is a method for constructing a pier, in which after the pier body is constructed to a predetermined height, the guide pillar is disassembled and removed, and the column cap and the upper end of the pier body are joined. An embodiment of the present invention will be described below with reference to the drawings. <A> Ground preparation of column capital (Fig. 1) A footing 1 is constructed in the ground, a formwork support and a scaffolding 11 are assembled on top of it, and a column capital skeleton 2 is manufactured on the ground inside. The column capital skeleton 2 is a hollow box, and an opening is provided in the upper floor slab 21 and the lower floor slab 22 which protrude in the horizontal direction at the upper end to form a penetration space 23 penetrating in the vertical direction. <B> Construction of Guide Pillar (FIG. 1) The guide pillar 3 is raised up to a predetermined height by a crane or the like by penetrating into the through space 23 of the pillar cap body 2. The guide pillar 3 is made of a square steel pipe or the like, and has a base 31 with an expanded pillar at the bottom. <C> Equipment such as a lifting device (FIGS. 2 and 3) A lifting device 4 is provided on the side surface of the guide column 3. Lifting device 4
As shown in FIG. 3, a steel prism fixed vertically to four side surfaces of the guide column 3, and a guide groove 41 is formed on a surface of the prism column facing the side surface of the guide column 3. And a guide groove 4 on two surfaces perpendicular to the side surface of the guide column 3.
It has one and a plurality of locking holes 42. A lifting jack 43 which expands and contracts in a vertical direction is accommodated in the guide groove 41, and upper and lower pins 45 are provided at the upper and lower ends thereof so as to protrude horizontally and can be accommodated. The lifting jack 43 can be moved up and down along the guide groove 41 by extending and retracting the lifting jack 43 while alternately attaching and detaching the upper and lower pins 44 and 45 to and from the locking hole 42. On the other hand, an engaging beam 2 having its tip inserted horizontally into the guide groove 41 and integrally joined to the upper end of the lifting jack 43 is inserted into the bottom of the column capital skeleton 2.
4 is provided. The lifting gravity of the lifting device 4 and its reaction force are transmitted to the column capital skeleton 2 via the engaging beams 24. Further, a plurality of support jacks 25 for pressing and supporting the guide columns 3 from the surroundings are provided in the middle part in the column cap body 2 in the horizontal direction. In addition, as shown in FIG.
The main frame 5 and the all-weather roof 51 are mounted on the ground (FIG. 2 shows a state where the capital building 2 has already been lifted from the ground). And a traveling crane 52 mainly used for removing the guide post 3. On the lower surface of the overhanging portion of the upper floor slab 21 of the column capital skeleton 2, a traveling crane 53 for mainly hanging a formwork or a reinforcing bar is provided. Furthermore, the lower floor slab 2
2, a weight receiving jack 6 which expands and contracts in the vertical direction.
1, a frame receiving beam 6 is provided, and a hoist 62 for hanging a formwork or a reinforcing bar is mainly provided on the lower surface of the beam. <D> Elevation and fixation of column capital (FIGS. 2 and 3) The elevating device 4 which has been equipped is operated to operate the column capital skeleton 2.
Is raised to a predetermined height along the guide column 3 and fixed. As a method of raising the column capital skeleton 2, the lower pin 45 is inserted into the locking hole 42 while the lifting jack 43 in the guide groove 41 is contracted, and the upper pin 44 is removed from the locking hole 42. Then, the lifting jack 43 is extended and the engaging beam 24 is lifted to raise the column capital skeleton 2. After ascending, the upper pin 44 is inserted into the locking hole 42 and the lower pin 45
Is removed from the locking hole 42, the lifting jack 43 is contracted, and the lower pin 45 is inserted into the locking hole 42 again. After the above operation is repeated to raise the capital skeleton 2 to a predetermined height, the upper and lower pins 44 and 45 are inserted to fix the position of the capital skeleton 2. <E> Construction of pier frame (FIGS. 2 and 4) The pier frame 7 is constructed in a space generated under the column capital frame 2 when it is raised. Figure 2 shows the first pier skeleton 7
Is shown, and the case where the second-stage pier frame is constructed will be described here. First, as shown in FIG. 2, using a hoist 62 and a traveling crane 53,
The inner formwork 8, the reinforcing bars 81, the outer formwork 82, and the like are installed on the first-stage pier frame 7. Then, a concrete is cast between the inner and outer forms 8 and 82 to complete the construction of the second-stage pier frame 7 as shown in FIG. At this time, a guide column receiving beam 71 is installed horizontally between the side walls of the pier frame 7. At this time, since a gap is generated between the upper end of the pier frame 7 and the frame receiving beam 6, as shown in FIG.
The weight receiving jack 61 is extended so that the skeleton receiving beam 6 is landed on the upper end of the pier frame 7, and the weight of the column capital skeleton 2 is supported by the pier frame 7. <F> Lifting and Fixing of Guide Column (FIGS. 2 and 4) Next, the guide column 3 is raised and fixed while operating the lifting device 4 to apply a reaction force to the column head skeleton 2. First, the lifting jack 43 is extended, the lower pin 45 is inserted into the locking hole 42, and the upper pin 44 is removed from the locking hole 42. With the guide pin 3 supported by the lower pin 45 in this manner, the weight receiving jack 61 is contracted to release the frame receiving beam 6, and the fixing of the base 31 of the guide post 3 to the ground is released. Next, the lifting jack 43 is contracted, and the guide post 3 is raised together with the lower pin 45. After ascending, the upper pin 44 is inserted into the locking hole 42, the lower pin 45 is pulled out from the locking hole 42, the lifting jack 43 is extended again, and the above operation is repeated to reach the predetermined height of the guide post 3.
To rise. <G> Disassembly / removal of the guide pillar (FIGS. 5 and 6) A step of raising and fixing the pillar head body 2 to a predetermined height along the guide pillar 3, and generated below the pillar head body 2 by the lifting. After the steps of constructing the pier frame 7 in the space to be made and the steps of ascending and fixing the guide columns 3 while applying a reaction force to the column capital frame 2 are repeated to construct the pier frame 7 to a predetermined height, FIG. As shown in FIG. 6, the guide pillar 3 is dismantled and removed using the traveling crane 52 or the like. In the step of lifting the guide column 3,
As shown in FIG. 5, the base 31 of the guide column 3 is fixed on the two guide column receiving beams 71 so as to cross the space between the beams. After being rotated and passed between the guide post receiving beams 7 on the upper stage, it is again rotated by 90 degrees and placed and fixed on the guide post receiving beam 7. <H> Placing concrete (FIGS. 6 and 7) After removing the guide columns 3, the reinforcing bars 72 between the upper end of the bridge pier frame 7 and the bottom of the column head frame 2 are joined. Then, a formwork 83 is installed outside these joints, and the concrete is cast into the pier frame 7 and the column capital frame 2 through the through space 23 of the column capital frame 2 to form an integral structure. Of the bridge pier 9.
After placing and curing the concrete, the equipment and the like of the column capital skeleton 2 are removed to complete the construction. As described above, according to the present invention, the capital and the guide pillar can be raised by the lifting device, so that the capital can be constructed on the ground and the traveler can be mounted on the ground at the capital. It is also possible to assemble on top of the part. In addition, it is not necessary to perform the conventional bracket support work at a high place. Therefore, work at high places can be reduced, higher safety can be ensured, and construction efficiency can be improved by using a plurality of traveling crane and hoist.

[Brief description of the drawings] [Fig. 1] Illustration of construction procedure [Fig. 2] Illustration of construction procedure FIG. 3 is an explanatory view of a lifting device. FIG. 4 is an explanatory view of a construction procedure. FIG. 5 is an explanatory view of a guide column receiving beam. FIG. 6 is an explanatory view of a construction procedure. FIG. 7 is an explanatory view of a construction procedure.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-48-57303 (JP, A) JP-A-59-206506 (JP, A) JP-A-60-3360 (JP, A) 5865 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) E01D 19/02 E01D 21/00

Claims (1)

(57) [Claims] [Claim 1] A column cap as a superstructure of a pier is manufactured on the ground, a guide column is set up from a lower end of the pier in the column cap, and a lifting device is provided on a side surface of the guide column. Along with the mounting, the column cap is provided with an engagement beam that engages with the lifting device, a step of operating the lifting device to raise and fix the column head to a predetermined height along the guide column, and Building a pier frame in the space below the capital,
Repeating the steps of raising and fixing the guide column while taking the reaction force to the column head by operating the lifting device, and repeatedly performing the process of fixing the bridge pier to a predetermined height, dismantling and removing the guide column A pier construction method that joins the column cap and the top of the pier frame.