JPH08232212A - Pier constructing method and execution method - Google Patents

Abstract

PURPOSE: To reduce the construction period by improving the efficiency of execution of a pier. CONSTITUTION: An inner mold 1 and an outer mold 2 made of pre-cast concrete where a horizontal steel to restrict a main reinforcement 3 is integrated with one side and the main reinforcement 3 is temporarily fixed are set adjacent to each other in the circumferential direction on the transverse section of the pier, and assembled on an executed skeleton K opposite to each other, and the respective main reinforcements 3 of the inner mold 1 and the outer mold 2 are connected to the respective executed main reinforcements at the lower position. Then, the concrete is placed in the space to be held by the inner mold 1 and the outer mold 2, and the concrete is solidified. The procedure of assembling the inner mold 1 and the outer mold 2 to the upper position of it and placing the concrete is further repeated.

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 pier, a main pier and a shear reinforcing bar that constrains it from the surroundings are arranged in each construction section, and a form is assembled and concrete is placed. The general method is to use a reusable mold, and repeat the process of assembling, dismantling, and refilling the form, and moving it upward. However, it takes time and effort to assemble and dismantle the form. The conventional method is inefficient because it takes time. In particular, when the cross section changes depending on the construction section of the pier, it is necessary to process the formwork, resulting in a marked decrease in efficiency. Also, the main bar can be lifted together for one construction section by using a lifting machine and arranged sequentially, but since the shear reinforcement bar cannot be preassembled as a single reinforcing bar, the bar arrangement work is one section. It is a cause of delay in construction.

At a high pier, a tower crane is used for unloading forms and reinforcing bars, but since the tower crane is also used for suspending the forms and reinforcing bars on the skeleton, the hoisting ability affects the progress of construction. However, the effect is greater as the pier height increases. As the bridge pier height increases, the effect of wind also causes 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.

The present invention has been made in view of the above background, and proposes a construction method for promoting the progress of construction and a construction method for implementing the construction method.

[0005]

According to the present invention, the formwork is an embedded formwork, a member corresponding to a shear reinforcing bar is integrated with the formwork, and the main bar is temporarily fixed so that construction in one construction section can be performed. Simplify the progress of construction.

The formwork has an inner formwork arranged on the inner peripheral side and an outer formwork arranged on the outer peripheral side in the cross section of the pier, and both the inner formwork and the outer formwork have a main bar on one side. It is made of precast concrete in a state where horizontal steel materials restrained from the surroundings are integrated. Horizontal steel products are arranged horizontally. The main bar is temporarily fixed in the vertical direction on the side surrounded by the horizontal steel material.

The inner form frame and the outer form frame are adjacent to each other in the circumferential direction on the cross section of the pier, and are assembled on the already constructed pier frame so as to face each other in the thickness direction of the pier frame. Horizontal steel members of the inner and outer molds that are adjacent to each other in the circumferential direction on the inner and outer peripheries of the pier are connected to each other, and the main bars of the inner and outer molds are connected to the main bars that have been constructed below. To be done. After that, concrete is poured into the space sandwiched between the inner mold and the outer mold, and the work of one construction section is completed. After the concrete is hardened, the work from the assembly of the inner and outer molds above it to the placing of concrete is repeated to complete the pier.

Horizontal steel is attached to the inner and outer molds in advance,
Temporary fixing of the main bar eliminates the work of individual bar arrangement, and the inner and outer forms become part of the pier's skeleton as they are after the concrete has been cast, so that demolding and reassembling and reassembly are possible. The labor of is also omitted, and the labor in the field can be saved. Since the construction in one construction section is completed by assembling the inner and outer forms, connecting the main bars, and placing concrete, the construction progress can be made significantly.

For the construction, in addition to the elevator that has already been constructed and is moved up and down along the outer periphery of the pier body, a post with a lifting machine at the top, a lower mount for supporting the post, and a lower mount along the post It will be carried out using a workbench consisting of an upper platform that can be raised and lowered. The elevator moves up and down along a track laid in the height direction on the outer peripheral side of the skeleton, and conveys the inner mold and the outer mold from the ground to the upper pedestal. The workbench rises using the inside of the skeleton every time it is installed a certain distance in the height direction, and for work from assembling of the inner and outer formwork unloaded to the upper platform to concrete placement. Used.

When the work table is raised by one construction section, the work platform is supported on the inner surface of the completed construction body, and the upper mount is raised every time the construction of one construction section is completed and the work platform is supported on the inner surface of the upper body. After that, the lower pedestal is raised to be supported on the inner surface of the body below the upper pedestal, and after the work platform is raised, the inner and outer molds that have been unloaded to the upper pedestal Assembly is done by a hoist attached to a workbench post.

The elevator unloads the inner and outer molds,
The hoisting machine on the workbench assembles the unloading inner and outer molds, and by separating the functions of each, it is possible to carry out the unloading work and the construction work on the skeleton in parallel. The efficiency and work efficiency are improved, and the construction period is shortened.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, the invention according to claim 1 integrates a horizontal steel material 4 corresponding to a shear reinforcing bar for restraining the main reinforcement 3 from the surroundings, and the main reinforcement 3 is temporarily fixed to the inner form 1 and the outside. It is a construction method for completing a hollow pier using the formwork 2.

As shown in FIGS. 2 and 3, both the inner mold 1 and the outer mold 2 are made of precast concrete and integrated with the concrete 6 cast on site to form a frame K of a part of the pier. . The horizontal steel material 4 is integrated with one surface of the inner mold 1 and the outer mold 2, and a jibber 5 is provided on the surface of the horizontal steel material 4 so as to ensure the integrity with the concrete 6. The main bars 3 are temporarily fixed to the inner mold 1 and the outer mold 2 while being held by the dowels 5 in the vertical direction, and the horizontal steel material 4 is partly near the inner mold 1 and the outer mold 2 of the main bar 3 and partly. It is embedded in precast concrete and placed horizontally. One side of the inner formwork 1 or the outer formwork 2 in FIGS. 2 and 3 shows the inside of the precast concrete.

As shown in FIGS. 1 and 2, the inner form 1 and the outer form 2 are circumferentially adjacent to each other on the inner peripheral side and the outer peripheral side in the transverse section of the pier, respectively, in the thickness direction of the frame K. Are assembled on the frame K of the pier, which has been installed facing each other. The inner mold 1 and the outer mold 2 which are opposed to each other are connected by a connecting member 7 which is installed in a direction opposite to each other in order to ensure stability when pouring concrete. Each main bar 3 of the inner mold 1 and the outer mold 2 is connected by a coupler 8 and other means with each main bar 3 of the inner mold 1 and the outer mold 2 which have been constructed and are adjacent to each other, and which have become the body K. The horizontal steel materials 4 and 4 of the inner molds 1 and 1 and the outer molds 2 and 2 which are adjacent to each other in the circumferential direction are connected to each other via a plate 9 or the like extending therebetween. The joint positions of the main bars 3 and 3 that continue vertically are shown in Fig. 3.
As shown in, the main bars 3 are displaced in the parallel direction, for example, every other one.

The inner mold 1 and the outer mold 2 are also shown in FIGS.
As shown in FIG. 1, the vertical steel material 10 is integrated for the convenience of transportation and assembly of the inner mold 1 and the outer mold 2, and for the stress sharing during the placement of the secondary concrete. The vertical steel material 10 is arranged on the side of the horizontal steel material 4 facing the outer formwork 2 or the inner formwork 1 side, and the inner formwork 1 and the outer formwork 2 are erected by the vertical steel material 10 and the connecting material 7 when the concrete 6 is poured. While facing each other. In addition, a connecting steel material 11 extending over both construction sections is arranged at the jointing portion of the concrete 6 in the construction sections that are vertically adjacent to each other, and the lower half is embedded in the lower frame K, and the inner mold 1 and the outer mold are formed. The frame 2 secures the stability on the frame K at the time of installation by joining the vertical steel material 10 to the connecting steel material 11.
The upper half of the connecting steel material 11 is embedded in the concrete 6 when the concrete 6 is poured.

5 to 9 showing the thick portion of the skeleton K of the pier
The construction procedure for one construction section will be described below. Although FIGS. 5 to 9 and FIGS. 11 to 14 are sectional views, some of them are shown in an elevational view for convenience.

The inner mold 1 and the outer mold 2 are installed on the constructed frame K in the above-described manner (FIG. 5), the horizontal steel members 4 and 4 are connected to each other, and the inner mold 1 and the outer mold which face each other are connected. The formwork 2 is connected by the connecting material 7 (FIG. 6). Subsequently, after connecting each main bar 3 of the inner mold 1 and the outer mold 2 to the main bar 3 protruding from the skeleton K (FIG. 7), the space sandwiched between the inner mold 1 and the outer mold 2 Concrete 6 is placed inside (Fig. 8). After the concrete 6 is hardened, the procedure from FIG. 5 to FIG. 8 is further repeated to build the pier. As shown in FIG. 9, the inner formwork 1 which became a part of the skeleton K by hardening the concrete 6
On the inner circumference side of the pier, a bracket 12 on which an upper mount 17 and a lower mount 16 of a work platform 13 to be described later are placed is projected.

According to the second aspect of the present invention, the inner mold 1 and the outer mold 2 are unloaded by the elevator 24 that moves up and down along the outer periphery of the constructed frame K, while the post 15 having the lifting machine 14 at the top is unloaded.
And the lower pedestal 16 that supports the post 15 and the work platform 13 that includes the upper pedestal 17 that can move up and down with respect to the lower pedestal 16 along the post 15 every time the construction section is constructed by using the inside of the pier. It is a method of raising, and is a construction method applied for implementing the method of claim 1.

A lift-up device 18 for lifting the upper mount 17 is installed on the post 15 of the workbench 13, and a tension member 19 connected between the lift-up device 18 and the upper mount 17 is installed between the lift-up device 18 and the upper mount 17. Similarly, a lift-up device 20 for lifting the lower mount 16 is installed on the upper mount 17, and the lift-up device 20
The tension member 21 is installed between the lower frame 16 and the lower frame 16.

A roof 22 covering the entire cross section of the pier is installed on the top of the post 15 of the work table 13, and a scaffolding is provided from the outer periphery of the roof 22.
23 hangs. The workbench 13 is placed under the environment not affected by the weather by the roof 22, and the construction is performed without interruption due to rain. The upper frame 17 and the scaffolding 23 are used for assembling the inner form 1 and the outer form 2, connecting the main bar 3 and the horizontal steel material 4, and placing concrete 6.

The workbench 13 is lifted while the upper mount 17 and the lower mount 16 of the workbench 13 are supported by the bracket 12 projecting on the inner surface side of the already constructed frame K (FIG. 10). Each time the construction of the construction section is completed, the upper pedestal 17 is raised by one construction section while the load of the workbench 13 is being borne on the lower pedestal 16, and the upper pedestal 17 is projected on the inner surface of the upper skeleton K. After being supported by the bracket 12 (FIG. 11), the lower pedestal 16 is raised while the load of the workbench 13 is being loaded on the upper pedestal 17 and is supported on the inner surface of the skeleton K below the upper pedestal 17 ( Figure
12), and so on. Every time the workbench 13 is raised, the work from the assembling of the inner mold 1 and the outer mold 2 according to the first aspect of the invention to the placing of the concrete 6 is performed (FIG. 13).

As shown in FIG. 14, the elevator 24 is installed so as to be able to ascend and descend along a track 25 laid in the height direction on the outer peripheral side of the skeleton K, and on the upper mount 17 of the inner mold 1 and the outer mold 2. Unload to. The inner formwork 1 and the outer formwork 2 unloaded on the upper mount 17 are suspended on the skeleton K by the lifting machine 14 of the workbench 13. Since the functions of the elevator 24 and the lifting machine 14 are independent, both can operate at the same time.

The pier is constructed by carrying out the invention according to claim 1 and the invention according to 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 mold and an outer mold made of precast concrete in which the main bar is temporarily fixed are used. Since it is a method of constructing bridge piers by repeatedly placing concrete, it does not require on-site reinforcement work, demolding and refilling, and the progress of construction can be promoted by labor saving.

According to the second aspect of the present invention, since the elevator unloads the inner mold and the outer mold and the hoisting machine of the workbench assembles the unloaded inner mold and the outer mold, the unloading work is performed. And construction work on the frame can be done in parallel, improving operating efficiency and work efficiency, and shortening the construction period.

In particular, by carrying out the invention of claim 1 and the invention of claim 2 in combination, there is no waste in the construction process, so that the construction period can be greatly shortened by the construction progress.

[Brief description of drawings]

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

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

FIG. 3 is an elevation view showing an inner mold or an outer mold.

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

FIG. 5 is an elevational view showing a state in which the inner formwork is installed on the constructed body.

FIG. 6 is an elevational view showing a state in which a horizontal steel material is connected by connecting an inner mold and an outer mold.

FIG. 7 is an elevational view showing a state in which main bars are connected.

FIG. 8 is an elevation view showing a state where concrete is poured.

FIG. 9 is an elevational view showing a state in which a bracket is projected.

FIG. 10 is an elevational view showing a state of the workbench at the time when pouring of concrete is completed.

FIG. 11 is an elevational view showing a state when the upper mount is raised.

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

FIG. 13 is an elevational view showing a state when the placing of concrete is completed after the workbench is raised.

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

[Explanation of symbols]

1 ... Inner form, 2 ... Outer form, 3 ... Main bar, 4 ... Horizontal steel, 5 ... Givel, 6 ... Concrete, 7 ... Connecting material, 8 ... Coupler, 9 ... Plate , 10 …… vertical steel, 11 …… connected steel, 12 …… bracket, 13 …… workbench, 14 …… lifter, 15 …… post, 16 …… bottom mount, 17
...... Upper pedestal, 18 ...... Lift up device, 19 ...... Tensile material, 20 ...... Lift up device, 21 ...... Tensile material, 22 ...... Roof, 23 ...... Scaffolding, 24 ...... Elevator, 25 ...... Track , K ... body.

Front page continuation (72) Inventor Shigemi Fukushima 13 13 Arakicho, Shinjuku-ku, Tokyo Sumitomo Construction Co., Ltd.

Claims (2)

[Claims] 1. An inner mold and an outer mold made of precast concrete in which a horizontal steel member for horizontally restraining the main bar from the surroundings is integrally formed on one surface, and the main bar is temporarily fixed to the side surrounded by the horizontal steel member in the vertical direction. On the cross-section of the pier, the frames are circumferentially adjacent to each other on the inner and outer circumference sides, and are assembled on the pier's skeleton that has already been constructed by facing each other in the thickness direction of the pier's skeleton and adjacent to each other in the circumferential direction. After connecting the horizontal steel members of the inner and outer molds to each other and connecting the main bars of the inner and outer molds to the main bars that have been constructed below, sandwich them between the inner and outer molds. A method of constructing a pier, in which concrete is placed in a closed space, and after the concrete is hardened, the steps from assembling the inner and outer molds above it to placing the concrete are repeated. 2. A construction method for carrying out the method according to claim 1, which uses an elevator which is elevated and lowered along a track laid in the height direction on the outer peripheral side of a pier frame that has been constructed. A post having a lifting machine at the top, a lower mount for supporting the post, and an upper part that can be moved up and down along the post with respect to the lower mount while transporting the inner formwork and the outer formwork according to claim 1 from the ground. While the work table consisting of the gantry is supported on the inner surface of the already constructed skeleton, the upper pedestal is raised every time the construction of one construction section is completed and is supported on the inner skeleton of the upper skeleton, and then the lower pedestal is raised. A pier construction method in which the work platform is raised by repeating the procedure of supporting it on the inner surface of the body below the upper frame.