JPH0657711A - Construction of foundation and pier bridge and movable bench - Google Patents

Abstract

PURPOSE:To conduct the construction work efficiently by a small-sized simple movable bench when the foundation and pier of a road bridge installed to a mountain section are built without constructing a road for construction by using the spanworm type movable bench. CONSTITUTION:Movable benchs, which can be forwarded movably in a spanworm type, are divided into ones for the foundation and piers of a bridge and installed at positions along the line of the construction execution of the bridge. Heavy machinery for constructing the foundation are loaded on the movable bench A for the foundation, and the foundation (a) is built near a ground surface. Suspended forms 80 for constructing the piers are mounted to the movable bench B for the piers, and the bench (that is, the suspended forms 80) is elevated by a lifting gear 70B, thus building the piers (b). When these construction processes are completed, the movable benchs A and B are transferred separately to foundation-pier constructing positions in the next rank respectively. The bench A is miniaturized and simplified and can be built at a low position, and a special lifting gear for lifting the forms is unnecessitated in the bench B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a bridge, particularly a bridge foundation and a bridge pier such as a road bridge erected in a mountain area, and a dedicated movable work platform used for carrying out this method. .

[0002]

2. Description of the Related Art Roads in mountainous areas have a long road length because they are sewn in mountainous areas, and the amount of excavated soil is enormous. Shortening is being done. Further, as is well known, the bridge erection work generally starts with the substructure of the bridge, that is, the construction of the pier including the foundation work. This procedure is no exception for the construction of road bridges in the mountains. And when constructing a bridge in the mountainous area, unlike the location of flat terrain, it is subject to topographical restrictions,
When constructing the foundation of bridges and bridge piers, it is necessary to construct roads for construction in advance in order to carry materials and heavy equipment for construction to the site.

[0003]

However, in the method of constructing the road for construction as described above, there is a problem that the natural environment is destroyed because the mountains are cut down and the trees are cut down. In addition, there is a problem that the construction cost of the construction road and the construction process are extra.

In order to solve such a problem, the applicant of the present invention can construct a foundation such as a road bridge and a pier in a mountainous area without constructing a road for construction, and a construction method of a bridge foundation / pier pier. And a movable elevated workbench has already been applied for (Japanese Patent Application No. 4-94107). This is to use a movable elevated work platform that can be relocated forward in the manner of a scale insect, and to build the foundation and pier from this movable elevated work platform. However, in the movable workbench as described above,
Since the work of the foundation and the bridge is performed from one movable elevated workbench, there is a problem that the workbench becomes large and the work efficiency decreases.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to construct a road bridge in a mountainous area without constructing a construction road by using a movable work bench of a length-adjusting insect system. When constructing the foundation and bridge piers, etc., the movable workbench can be made into a small and simple structure,
Another object of the present invention is to provide a construction method capable of efficiently performing work and a movable workbench for carrying out this construction method.

[0006]

The construction method of the present invention comprises:
First of all, at the position along the bridge construction line, a movable workbench that can move forward in the manner of a scale insect is installed separately for the foundation of the bridge and for the bridge pier, and the foundation is constructed on the movable workbench for the foundation. Heavy equipment such as excavators will be installed, and a suspension formwork for constructing the pier will be installed on the movable work platform for the pier. Then, a unit foundation work for the bridge is constructed by using heavy machinery from the movable work platform for the foundation, and the pier is constructed by the suspension form while raising the movable work platform for the pier, and the bridge foundation and the pier are separated independently. Install. Then, when these construction steps are completed, the movable work platform for foundation and the movable work platform for bridge piers are moved forward to the next unit foundation work position and pier position, respectively, and the foundation construction process and the bridge pier construction process The process of relocating the movable work platform and the movable work platform for bridge piers is alternately repeated, and unit foundation work and bridge piers are sequentially built along the bridge construction line to build.

The foundation movable workbench of the present invention mainly comprises a work floor, a pair of movable girders, a slide operation mechanism, a plurality of legs, a leg fixing device, and a leg lifting device. Then, the work floor is provided with a work opening through which a drill rod or the like for constructing a bridge foundation can be inserted and hung, and the work floor and the movable girder are combined so as to be relatively slidable in the erection direction, The slide actuating mechanism is assembled so as to be relatively slidable, and the plurality of legs are attached to the work floor and the movable girder via the fixing device and the elevating device.

The movable work platform for bridge piers of the present invention mainly comprises a work floor, a pair of movable girders, a slide actuating mechanism, a plurality of legs, a leg fixing device, and a leg lifting device. And, the work floor is provided with a work opening and a suspension formwork for constructing a bridge pier, and the work floor and the movable girder are combined so as to be relatively slidable in the erection direction, and the slide operation mechanism is provided. It is assembled and made relatively slidable, and the plurality of legs are attached to the work floor and the movable girder via the fixing device and the elevating device.

[0009]

[Operation] With the above-mentioned structure, the movable work platform for the foundation and the movable work platform for the bridge piers are respectively arranged at the construction positions of the bridge foundation and the pier. In the movable work table for foundation, the reverse circulation drill etc. installed are drooped from the work mouth to drill the pile holes in the foundation, and then the foundation is constructed by setting the rebar cage and placing concrete. This work table for the foundation is separated from the one for the pier and only the foundation is constructed, so
It can be a small and simple workbench, and can work at a low position near the surface of the earth. In the movable work platform for the pier, the work platform, that is, the suspension formwork is raised by the lifting device to build the pier. Since the formwork ascends together with the workbench, there is no need for a dedicated formwork elevating device for sliding the formwork. When the foundation and bridge piers are constructed, the movable girder with the legs raised is moved by the slide actuating mechanism while the working floor is supported by the legs, and then the working floor is moved with the moving girders supported by the legs. Movable bases for foundations and piers will be moved forward to the next foundation and pier construction position in the same manner as a scaled insect. Since the movable workbench can be moved separately for the foundation and the pier, it is not restricted to one work.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to an illustrated embodiment. FIG. 1 is a side view showing an example of constructing a bridge foundation and a bridge pier in a mountain area using a movable workbench, and FIGS. 2 and 3 are a plan view and a cross-sectional view of the movable workbench. As shown in FIG. 1, as a movable work platform, a movable work platform A for a foundation for constructing a foundation a of a bridge and a movable work platform B for a bridge for constructing a bridge pier b are used.

The movable work benches A and B have different sizes but have the same structure. As shown in FIGS.
Mainly a work floor 10, a pair of left and right moving girders 20, a slide actuating mechanism 30 for relatively moving the work floor 10 and the moving girders 20, and a plurality of legs 40 and 50 attached to the work floor 10 and the moving girder 20, respectively. , A fixed support device 6 for fixing each leg to the work floor 10 and the movable girder 20
0, an elevating device 70 for elevating the work floor 10 and the movable girder 20 with respect to the legs, a hanging form 80 attached to the movable work table B for placing concrete, and carrying out earth and sand and carrying in materials. It is composed of a pair of left and right conveyors 90.

First, the work floor 10 has a steel frame structure having a rectangular plane shape or a reinforced concrete structure, and has a structure capable of sufficiently withstanding heavy machinery such as a crane. A work port 11 is provided at the center of the end of the work floor 10 in the erection direction. Work opening 11A of the movable work table A for foundation
Is an opening for drilling work of foundation piles and inserting rebar cages using a reverse circulation drill. In the movable work platform B for bridge piers, the hanging form 8 is placed under the work port 11B.
0 will be fixed integrally so that the reinforcing bar cage of the pier can be inserted and concrete can be placed.

The work floor 10 and the movable girder 20 are assembled so as to be relatively slidable. That is, as shown in FIG. 2, the lower parts of the pair of left and right movable girders 20 are connected to each other by connecting beams 21 at both ends in the erection direction, and the work floor 10 is moved to the movable girder 20.
It is placed on the connecting beam 21 in a state of being sandwiched by. And
As shown in FIG. 3, guide rails 12 are integrally projectingly provided on both side surfaces of the work floor 10 parallel to the erection direction, and guide rails 12 are fitted and locked on the corresponding inner side surfaces of the movable girder 20. 22 is provided. A sliding bearing 23 is provided between the work floor 10, the movable girder 20 and the connecting beam 21.

As shown in FIG. 3, the slide operation mechanism 30 includes racks 31 embedded in both corners of the bottom surface of the work floor 10 close to the moving girder 20 and parallel to the erection direction, and a pinion 32 meshing with the rack 31. And a geared motor 33 which is attached to the bottom surface of the movable girder 20 and rotates the pinion 32. When the geared motor 33 is rotationally driven while the work floor 10 is fixed by the legs 40 described later, the pinion 32 rolls along the rack 31 and the movable girder 20 moves. Conversely, the moving girder 20 and leg 5
If fixed by 0, the rack 31 is sent by the rotation of the pinion 32, and the work floor 10 moves.

The legs 40 are provided at the four corners of the work floor 10 to make a total of four legs, and the legs 50 are provided at both ends of the movable girder 20 in the erection direction to make a total of four legs. 60 through the lifting device 70 and the work floor 10,
Attach to the moving girder 20. Although not shown in detail, the fixed support device 60 is composed of a clamp that is gripped and fixed on the outer circumference of the leg by hydraulic operation, for example. Leg 4
If 0 is raised by the lifting device 70, the work floor 10 can be moved with the movable girder 20 supported by the legs 50 as a guide, and conversely, by raising the legs 50,
The movable girder 20 can be moved using the work floor 10 as a guide.

As shown in FIG. 3, the lifting device 70 includes a hydraulic lifting cylinder 71 on the upper surface of the work floor 10 and the movable girder 20.
Is vertically installed and the lifting cylinder 71 is operated to move the legs 40 and 50 to the operating floor 10 and the moving girder 2.
It is configured to move up and down with respect to 0. The legs 40 and 50 can be moved up and down with respect to the fixed work floor 10 and the movable girder 20, or the work floor 10 and the movable girder 20 can be moved up and down with respect to the fixed legs 40 and 50. When the lifting device 70 is operated, the fixing by the fixing support device 60 is released prior to the operation.

As shown in FIG. 1, in the movable working table A for the foundation, since the foundation work is performed near the ground, the legs 40a and 50a have short lengths. on the other hand,
In the movable work platform B for bridge piers, the legs 40b and 50b have a length that allows the working floor 10 to be raised from near the ground to the bridge girder C in order to construct the bridge pier b. In addition, in the movable work platform B for the pier, the leg 40
The elevating device 70 for pulling up b, 50b is also used for elevating the movable work table B. Lifting device 7
The raising and lowering by 0 and the fixing by the fixed supporting device 60 are alternately repeated so as to be carried out by the scale insect method. It should be noted that this lifting is not limited to the lifting device 70 and the fixed support device 60, and a rack integrally formed on the leg, a pinion meshing with the rack, and a system for lifting the pinion by a motor with a brake that rotationally drives the pinion, etc. But it's okay.

As shown in FIG. 3, each leg 40,
Bits 41 and 51 are provided at the lower end of 50, and a leg rotating device is incorporated inside the lifting device 70, whereby the legs 40 and 50 are rotated and the bit 4 is rotated.
It is configured so that 1,51 can be supported by biting into the ground. With this configuration, even when the ground is a hard ground or a slope, the entire weight of the movable work tables A and B and the mounted heavy machinery can be stably supported.

A ladder (not shown) that swings and opens vertically is provided at the rear end of the work floor 10 of each movable work platform A, B so that heavy machinery and personnel can be installed between the bridge girder and the movable work platform. Make it possible to move. The conveyor 90 is connected to the rear end of the moving girder 20 and also has a post 91 and a wire rope 92.
It will be used to carry out earth and sand and carry in materials.

With the above structure, the foundation of the bridge and the bridge piers are constructed as follows (see FIGS. 1 and 4). (1) Movable work table A for the foundation, legs 40A, 50A in total 8
It is supported by a book, and the pile holes of the foundation a are drilled from the working opening 11A using a reverse circulation drill. When drilling is completed, insert the rebar cage of foundation a into the drilled hole,
Concrete is poured and the foundation a is constructed.

(2) The movable work platform B for piers is arranged behind the movable work platform A for foundations, and in parallel with the work of (1), the piers b are constructed on the already constructed foundation a. . At the time of construction, the movable work platform B for bridge piers, which is supported by a total of eight legs 40B and 50B, is set to the lower limit position, and the rebar cage for bridge piers is inserted from the work opening 11B into the hanging form 80, and concrete is added. To set. Next, the work floor 10B, that is, the suspension form 80 is raised by the lifting device 70 in accordance with the rising of the piers, and the piers b are sequentially constructed from the bottom.

(3) Movable work platforms A and B for foundation and pier
When each construction is completed,
Move to the pier construction position. Forward movement is performed as follows. The fixed support device 60 of the leg 50 of the movable girder 20 is released, and then the lifting device 70 raises the leg 50 by a predetermined amount. In this state, the entire weight of the movable workbench including the heavy equipment is supported by the legs 40 of the work floor 10. The slide operating mechanism 30 is operated to move the movable girder 20 forward along the erection work line with respect to the work floor 10 in the fixed state.

When the movable girder 20 advances by a predetermined stroke and stops, the leg 50 in the ascended state is lowered by the elevating device 70, is regrounded to the ground surface, and is fixed by the fixing support device 60. The work floor 10 is moved forward similarly to the movable girder 20.
The procedure is the same as above. While moving, the total weight of the movable workbench including heavy equipment is 5
Supported by 0. When moving the work floor 10B of the movable work platform B for a pier, the suspension form 80 is moved from the top of the pier constructed by removing the rear part of the suspension form 80.
To be able to leave.

(4) By the procedure described above, the work floor 10 and the movable girder 20 slide alternately, and move forward in the manner of what is called a scale insect. When each of the work ports 11A and 11B reaches the next foundation and pier construction position, the forward movement is stopped and the foundation a and the pier b are constructed again in the same manner as described above. (5) When the substructure consisting of the foundation a and the pier b is added, the bridge girder, which is the superstructure, will be added or pushed out from the existing side to construct by the follow-up construction method.

With the construction method using the movable workbench as described above, it is not necessary to construct a road for special construction as in the conventional case, and the cutting of trees leading to the destruction of nature,
It is possible to eliminate the cutting of mountains and to reduce the construction cost of the construction road and the construction process, so that the bridge can be constructed at low cost. Also, since the movable workbench is separated for the foundation and the bridge, the movable workbench for the foundation can be a small and simple device, and construction work can be performed at a low position, which is safe and efficient. You can do the work. On the other hand, the movable work platform for the pier can be raised and lowered by using the leg lifting device.Therefore, by fixing the suspension formwork to the work platform, a special lifting device for sliding the formwork is required. In addition, since it can be raised and lowered independently of the movable work table for the foundation, a simple and inexpensive work table can be obtained. Further, the foundation construction and the bridge pier construction can be separately constructed and relocated, and the construction can be performed quickly and efficiently without being restricted by one construction work.

[0026]

As described above, according to the present invention, a movable work platform that can be moved forward in the manner of a scale insect is installed separately for a bridge foundation and a bridge pier. Since the construction work was carried out and the pier was constructed by the suspension form while raising the movable work platform for the pier, the following effects are obtained. (1) Since the foundation can be constructed with a small and simple movable work table and work can be performed at a low position, safe and efficient work can be performed. (2) Since the movable work platform for pier construction can be lifted and lowered independently from the foundation by the lifting device, a dedicated formwork lifting device is not required, so the work platform should be a simple and inexpensive device. be able to. Movable worktables for foundations and piers can be constructed at low cost, and a bridge can be constructed more economically in combination with a construction method that does not require a construction road. (3) Since the foundation construction and the bridge pier construction can be performed separately and can be relocated individually, it is possible to perform quick and efficient work without being restricted by one work.

[Brief description of drawings]

FIG. 1 is a side view showing a state in which a foundation / pier is constructed using the movable workbench of the present invention.

2 is a plan view showing the movable workbench of FIG. 1. FIG.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a schematic side view showing the construction method of the present invention in the order of steps.

[Explanation of symbols]

A movable work platform for foundation B movable work platform for bridge pier a foundation b bridge pier 10 work floor 40 leg 11 working mouth 41 bit 12 guide rail 50 leg 20 moving girder 51 bit 21 connecting beam 60 fixed support device 22 guide groove 70 lifting device 23 Sliding bearing 71 Lifting cylinder 30 Slide actuating mechanism 80 Suspending form 31 Rack 90 Conveyor 32 Pinion 91 Post 33 Geared motor 92 Wire rope

Claims (3)

[Claims] 1. A movable workbench that can be moved forward in the manner of a scale insect is installed separately at a position along a bridge construction line for a bridge foundation and a bridge pier. Installed heavy equipment such as excavators for foundation construction, and provided a suspension formwork for bridge pier construction on the movable work platform for bridge piers, and built unit foundation work for bridges from the movable work platform for foundation by heavy machinery Foundation building process, the bridge pier construction process that builds the pier with the suspension form while raising the movable work platform for the pier, and when these building processes are completed, the movable work platform for the foundation and the movable work platform for the pier are respectively ranked next. Of the unit foundation work position and the relocation process of moving forward to the bridge pier position, the foundation building process and the bridge pier building process, and the moving process of the foundation movable work platform and the bridge pier movable work platform are alternately repeated to Along the erection line Fundamentals and how to build a pier of a bridge, characterized by Tatemashi build foundation work and piers in order. 2. A movable work platform for constructing only a foundation of a bridge, comprising a work floor, a pair of movable girders, a slide actuating mechanism, a plurality of legs, a leg fixing device, and a leg lifting device. The work floor is provided with a work opening through which a drill rod or the like for constructing a bridge foundation can be inserted and suspended, and the work floor and the movable girder are combined so as to be relatively slidable in the erection direction. At the same time, the slide actuation mechanism is assembled to make it relatively slidable, and the plurality of legs are attached to the work floor and the movable girder through the fixing device and the elevating device, for a foundation. Movable work table. 3. A movable work platform for constructing only piers, comprising a work floor, a pair of movable girders, a slide operation mechanism,
A plurality of legs, a leg fixing device, and a leg elevating device are provided, the work floor is provided with a work port and a suspension formwork for constructing a pier, the work floor and the movable girder, The slide operating mechanism is assembled to be relatively slidable in the erection direction, and the slide operating mechanism is assembled to be relatively slidable, and the plurality of legs includes the fixing device and the elevating device on the work floor and the movable girder. A movable work platform for piers, which is characterized by being attached via