JP2790986B2 - Bridge pier construction method and construction 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 construction method for constructing a hollow bridge pier by dividing it into a plurality of construction sections and a construction method for implementing the method.

[0002]

2. Description of the Related Art In the construction of a bridge pier, a procedure of arranging a main reinforcing bar and a shear reinforcing bar for restraining the main reinforcing bar from the surroundings per unit of construction section, assembling a formwork, and placing concrete is performed. In general, a method is used in which a formwork that can be diverted is used, and the assembling, dismantling, and changing of the formwork are repeated and moved upward. However, assembling and dismantling the formwork is troublesome. The conventional method is inefficient because it requires time. In particular, when the cross section changes depending on the construction section of the pier, it is necessary to process the formwork, so the efficiency is significantly reduced. In addition, the main reinforcement can be lifted together for one construction section by using a lifting machine, and can be sequentially arranged.However, since the shear reinforcement cannot be pre-assembled as a single reinforcing bar, the reinforcement work is performed in one section. Is causing delays in construction.

[0003] A tower crane is used for unloading a formwork or a reinforcing bar on a high pier, but the tower crane is also used for suspending a formwork and a reinforcing bar on a skeleton, so that a hoisting capacity affects the progress of construction. However, the effect is greater as the pier height increases. As the height of the piers increases, the effect of the wind also increases, resulting in a decrease in operating efficiency. If the operating efficiency decreases, the possibility of being affected by the weather increases, leading to a delay in construction.

[0004] The present invention has been made in view of the above background, and proposes a construction method for progressing construction and a construction method for implementing the method.

[0005]

According to the present invention, the construction in one construction section can be performed by using a mold as a buried mold, integrating a member corresponding to a shear reinforcing bar with the mold, and temporarily fixing a main bar. Simplify and progress construction.

[0006] The formwork includes an inner formwork arranged on the inner periphery side and an outer formwork arranged on the outer periphery side in the cross section of the pier. Both the inner formwork and the outer formwork have a main reinforcement on one side. It is made of precast concrete in a state in which horizontal steel materials constrained from the surroundings are integrated. The horizontal steel material is arranged in the horizontal direction. The main reinforcement is temporarily fixed in the vertical direction to the side surrounded by the horizontal steel material.

[0007] The inner formwork and the outer formwork are adjacent to each other in the circumferential direction on the cross section of the pier, and are assembled on the pier body which has been constructed so as to face each other in the thickness direction of the pier body. The horizontal steel materials of the inner formwork and the outer formwork that are adjacent to each other in the circumferential direction on the inner and outer sides of the pier are connected to each other, and the main reinforcements of the inner formwork and the outer formwork are connected to the main reinforcements that have been constructed below. Is done. Thereafter, concrete is poured into the space sandwiched between the inner formwork and the outer formwork, and the work in one construction section is completed. After the concrete is hardened, the operations from assembling the inner formwork and the outer formwork further upward to placing the concrete are repeated to complete the pier.

[0008] A horizontal steel material is attached to the inner mold and the outer mold in advance,
Temporary fixation of the main reinforcement eliminates individual rebar arrangement work, and the inner and outer formwork become part of the pier body as it is after casting the concrete, so it can be removed, replaced, and reassembled. Labor is saved, and labor on site work is saved. The construction in one construction section is completed by assembling the inner formwork and the outer formwork, connecting the main reinforcement, and placing the concrete, so that the construction is greatly advanced.

[0009] In addition to the lift that moves up and down along the outer periphery of the skeleton that will be a bridge pier, the post has a lifting machine at the top, a lower gantry supporting the post, and a lower gantry along the post. The operation is performed using a worktable including an upper mount that can be moved up and down. The elevator moves up and down along a track laid in the height direction on the outer peripheral side of the skeleton, and transports the inner formwork and the outer formwork from the ground to the upper gantry. The workbench rises by using the inside of the skeleton every time a certain distance is constructed in the height direction, and for work from assembling the inner formwork and the outer formwork unloaded to the upper gantry to concrete casting Used.

When the work table is raised for one construction section, the upper pedestal is raised every time the construction of one construction section is completed, while the work table is supported on the inner surface of the completed skeleton, and the work table is supported on the upper skeleton surface. After that, the lower gantry is raised and supported on the inner surface of the skeleton below the upper gantry, and after the workbench is raised, the inner and outer cranes unloaded to the upper gantry are lifted. Assembly is performed by a lifting machine attached to the workbench post.

An elevator lifts and unloads the inner and outer forms.
The unloading inner formwork and outer formwork are assembled by the lifting machine of the workbench, and their functions are separated so that the unloading work and the construction work on the skeleton can be performed in parallel. Efficiency and work efficiency are improved, and the construction period is shortened.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a horizontal steel member 4 corresponding to a shear reinforcing bar for restraining a main bar 3 from the periphery is integrated with the inner form 1 to which the main bar 3 is temporarily fixed as shown in FIG. This is a construction method for completing a hollow pier using the formwork 2.

As shown in FIGS. 2 and 3, the inner mold 1 and the outer mold 2 are both made of precast concrete, and are integrated with the concrete 6 cast on site to form a part K of the pier. . The horizontal steel material 4 is integrated with one surface of the inner mold frame 1 and the outer mold frame 2, and a dowel 5 for ensuring integrity with the concrete 6 protrudes from the surface. The main reinforcement 3 is temporarily fixed to the inner formwork 1 and the outer formwork 2 while being held by the dowel 5 in the vertical direction, and the horizontal steel 4 is partially moved toward the inner formwork 1 and the outer formwork 2 of the main reinforcement 3. It is buried in precast concrete and placed horizontally. One side of the inner mold 1 or the outer mold 2 in FIGS. 2 and 3 shows the inside of the precast concrete.

As shown in FIGS. 1 and 2, the inner mold 1 and the outer mold 2 are circumferentially adjacent to each other on the inner circumferential side and the outer circumferential side on the cross section of the pier, respectively, in the thickness direction of the frame K. Are assembled on a bridge pier body K that has been installed facing each other. The opposing inner mold 1 and outer mold 2 are connected by a connecting member 7 installed in the opposing direction to ensure stability during concrete casting. The main reinforcements 3 of the inner formwork 1 and the outer formwork 2 are connected to the main reinforcements 3 of the inner formwork 1 and the outer formwork 2 which have been constructed adjacent to the lower side and have become the skeleton K by couplers 8 and other means. The horizontal steel members 4, 4 of the inner mold frames 1, 1 and the outer mold frames 2, 2, which are adjacent to each other in the circumferential direction, are connected to each other via a plate 9 or the like straddling therebetween. Fig. 3 shows the joint positions of the main bars 3
As shown in (1), for example, every other main bar 3 is shifted in the direction in which the main bars 3 are arranged in parallel.

The inner mold 1 and the outer mold 2 are also shown in FIGS.
As shown in FIG. 7, a vertical steel material 10 is integrated for the convenience of transporting and assembling the inner mold frame 1 and the outer mold frame 2 and for sharing stress at the time of placing the secondary concrete. The vertical steel material 10 is disposed on the side of the outer steel frame 2 and the inner metal frame 1 facing the horizontal steel material 4, and the inner metal frame 1 and the outer metal frame 2 stand when the concrete 6 is poured by the vertical steel material 10 and the connecting member 7. While maintaining the facing state. In addition, a connecting steel member 11 straddling both construction sections is arranged at a joint portion of the concrete 6 in the construction section adjacent vertically, and the lower half is embedded in the lower frame K, and the inner form 1 and the outer mold are formed. The frame 2 secures stability on the skeleton K at the time of installation by joining the vertical steel material 10 to the connecting steel material 11.
The upper half of the connection steel 11 is embedded in the concrete 6 when the concrete 6 is poured.

FIGS. 5 to 9 show the thick portions of the frame K of the pier.
The construction procedure of one construction section will be described. Although FIGS. 5 to 9 and FIGS. 11 to 14 are sectional views, some of them are shown as elevation views for convenience.

The inner frame 1 and the outer frame 2 are installed on the completed skeleton K in the above-described manner (FIG. 5), and the horizontal steel members 4, 4 are connected to each other, and the inner frame 1 and the outer frame are opposed to each other. The form 2 is connected by the connecting member 7 (FIG. 6). Subsequently, after connecting the main reinforcements 3 of the inner formwork 1 and the outer formwork 2 to the main reinforcements 3 protruding from the skeleton K (FIG. 7), a space sandwiched between the inner formwork 1 and the outer formwork 2. Concrete 6 is poured into the inside (FIG. 8). After the concrete 6 has hardened, the steps of FIGS. 5 to 8 are further repeated to construct the pier. As shown in FIG. 9, the inner formwork 1 which has become a part of the skeleton K by the hardening of the concrete 6.
On the inner peripheral side of the pier, a bracket 12 on which an upper pedestal 17 and a lower pedestal 16 of a worktable 13 to be described later are mounted protrudes.

According to a second aspect of the present invention, the inner form 1 and the outer form 2 are unloaded by the lift 24 which moves up and down along the outer periphery of the completed frame K, while the post 15 having the hoist 14 at the top.
And using the inside of the pier each time a workbench 13 consisting of a lower gantry 16 supporting the post 15 and an upper gantry 17 that can move up and down with respect to the lower gantry 16 along the post 15 is constructed only for one construction section. This is a construction method applied to carry out the method according to claim 1.

The post 15 of the work table 13 is provided with a lift-up device 18 for lifting the upper pedestal 17, and a tension member 19 connected to both is installed between the lift-up device 18 and the upper pedestal 17. Similarly, a lift-up device 20 that lifts the lower mount 16 is installed on the upper mount 17, and the lift-up device 20
A tension member 21 is erected between the cradle and the lower gantry 16.

A roof 22 covering the entire cross section of the pier is erected on the top of the post 15 of the workbench 13.
23 hangs up. The workbench 13 is placed in an environment unaffected by the weather by the roof 22, and the construction is performed without interruption due to rain. The assembling of the inner form 1 and the outer form 2, the connection of the main reinforcement 3 and the horizontal steel 4, and the placing of the concrete 6 are performed using the upper base 17 and the scaffold 23.

The work table 13 is raised while the upper frame 17 and the lower frame 16 of the work table 13 are supported by the brackets 12 protruding from the inner surface of the completed frame K (FIG. 10). Each time the construction of the construction section is completed, the upper gantry 17 is raised by one construction section while the load of the work table 13 is loaded on the lower gantry 16, and the upper gantry 17 is protruded from the inner surface of the upper frame K. After being supported by the bracket 12 (FIG. 11), the lower gantry 16 is raised with the load of the work table 13 being applied to the upper gantry 17, and is supported on the inner surface of the frame K below the upper gantry 17 ( Figure
12). Every time the work table 13 is raised, the work from assembling the inner formwork 1 and the outer formwork 2 according to the first aspect of the invention to placing concrete 6 is performed (FIG. 13).

As shown in FIG. 14, the elevator 24 is installed so as to be able to move up and down along a track 25 laid in the height direction on the outer peripheral side of the frame K, and is mounted on the upper frame 17 of the inner mold 1 and the outer mold 2. Unloading to. The inner form 1 and the outer form 2 unloaded on the upper gantry 17 are suspended on the frame K by the lifting machine 14 of the work table 13. Since the functions of the lift 24 and the hoist 14 are independent, both can operate simultaneously.

The pier is constructed by carrying out the invention of claim 1 and the invention of claim 2 in parallel.

[0024]

According to the first aspect of the present invention, a horizontal steel material corresponding to a shear reinforcing bar is integrated, and an inner and an outer frame made of precast concrete in which a main bar is temporarily fixed are used. Since the method is a method of constructing a bridge pier by repeatedly placing concrete, it is possible to omit the rebar arrangement work, the removal of the mold and the re-arrangement at the site, and to promote the construction by labor saving of the work.

The second aspect of the present invention is a method in which the lifting and lowering of the inner formwork and the outer formwork are performed by the lift, and the lifting machine of the worktable performs the assembly of the unloaded inner formwork and the outer formwork. And the construction work on the skeleton can be performed in parallel, thereby improving the operation efficiency and work efficiency, and shortening the construction period.

In particular, by combining the invention of claim 1 and the invention of claim 2, there is no waste in the progress of construction, so that the effect of shortening the construction period by the progress of construction is great.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a construction procedure of a pier.

FIG. 2 is a perspective view showing an inner mold frame or an outer mold frame and an installation state thereof.

FIG. 3 is an elevational view showing an inner formwork or an outer formwork.

FIG. 4 is a plan view of FIG. 3;

FIG. 5 is an elevational view showing a state when the inner formwork is installed on the constructed skeleton.

FIG. 6 is an elevational view showing a state where the inner mold and the outer mold are connected and a horizontal steel material is connected.

FIG. 7 is an elevation view showing a state when main bars are connected.

FIG. 8 is an elevational view showing a state when concrete is cast.

FIG. 9 is an elevation view showing a state where a bracket is protruded.

FIG. 10 is an elevational view showing the state of the workbench at the time when concrete placement has been completed.

FIG. 11 is an elevation view showing a state when the upper gantry is raised.

FIG. 12 is an elevational view showing a state when the lower gantry is raised.

FIG. 13 is an elevational view showing a state in which concrete placement after raising the work table is completed.

FIG. 14 is an elevational view showing the relationship between the elevator and the workbench.

[Explanation of symbols]

1 ... inner mold, 2 ... outer mold, 3 ... main reinforcement, 4 ... horizontal steel, 5 ... dowel, 6 ... concrete, 7 ... connecting material, 8 ... coupler, 9 ... plate , 10… vertical steel, 11… connecting steel, 12… bracket, 13… working table, 14… lifting machine, 15… post, 16… lower pedestal, 17
…… Top stand, 18… lift device, 19 …… tension member, 20 …… lift device, 21 …… tension member, 22 …… roof, 23 …… scaffold, 24 …… elevator, 25 …… track , K ... The skeleton.

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigemi Fukushima 13-4 Arakicho, Shinjuku-ku, Tokyo Sumitomo Construction Co., Ltd. (56) References JP-A-7-138914 (JP, A) 5-280012 (JP, A) JP-A-6-146218 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E01D 21/00 E01D 19/02

Claims (2)

(57) [Claims] 1. A precast concrete inner mold and an outer mold having a horizontal steel material integrated on one side thereof for horizontally restraining a main reinforcement from the periphery and a main reinforcement temporarily fixed in a vertical direction on a side surrounded by the horizontal steel material. Assemble the frame on the pier's skeleton, which has been constructed so that the frames are circumferentially adjacent to each other on the inner and outer sides on the cross section of the pier, and opposed to each other in the thickness direction of the pier's skeleton. After connecting the horizontal steel materials of the inner formwork and the outer formwork to each other, and connecting the main reinforcements of the inner formwork and the outer formwork to the main reinforcements constructed below, sandwich the inner formwork and the outer formwork. A method of constructing a bridge pier in which concrete is poured into a closed space, and after the hardening of the concrete, the procedure from assembling the inner formwork and the outer formwork further up to placing the concrete is repeated. 2. A construction method for carrying out the method according to claim 1, wherein the construction is carried out by using an elevator that moves up and down along a track laid in the height direction on the outer peripheral side of a skeleton to be a pier. A post having a hoist at the top, a lower frame supporting the post, and an upper portion capable of moving up and down with respect to the lower frame along the post while conveying the inner frame and the outer frame according to claim 1 from the ground. With the work table consisting of the gantry supported on the inner surface of the constructed skeleton, the upper gantry is raised every time the construction of one construction section is completed and supported on the upper skeleton surface, and then the lower gantry is raised. A method of constructing a pier that raises the workbench by repeating the procedure of supporting it on the inner surface of the skeleton below the upper gantry.